+# Copyright (c) 2011-2019, Ulf Magnusson
# SPDX-License-Identifier: ISC
-#
-# Author: Ulf Magnusson
-# https://github.com/ulfalizer/Kconfiglib
-
-# This is Kconfiglib, a Python library for scripting, debugging, and extracting
-# information from Kconfig-based configuration systems. To view the
-# documentation, run
-#
-# $ pydoc kconfiglib
-#
-# or, if you prefer HTML,
-#
-# $ pydoc -w kconfiglib
-#
-# The examples/ subdirectory contains examples, to be run with e.g.
-#
-# $ make scriptconfig SCRIPT=Kconfiglib/examples/print_tree.py
-#
-# Look in testsuite.py for the test suite.
"""
-Kconfiglib is a Python library for scripting and extracting information from
-Kconfig-based configuration systems. Features include the following:
+Overview
+========
- - Symbol values and properties can be looked up and values assigned
- programmatically.
- - .config files can be read and written.
- - Expressions can be evaluated in the context of a Kconfig configuration.
- - Relations between symbols can be quickly determined, such as finding all
- symbols that reference a particular symbol.
- - Highly compatible with the scripts/kconfig/*conf utilities. The test suite
- automatically compares outputs between Kconfiglib and the C implementation
- for a large number of cases.
+Kconfiglib is a Python 2/3 library for scripting and extracting information
+from Kconfig (https://www.kernel.org/doc/Documentation/kbuild/kconfig-language.txt)
+configuration systems.
-For the Linux kernel, scripts are run using
+See the homepage at https://github.com/ulfalizer/Kconfiglib for a longer
+overview.
- $ make scriptconfig [ARCH=<arch>] SCRIPT=<path to script> [SCRIPT_ARG=<arg>]
+Since Kconfiglib 12.0.0, the library version is available in
+kconfiglib.VERSION, which is a (<major>, <minor>, <patch>) tuple, e.g.
+(12, 0, 0).
-Using the 'scriptconfig' target ensures that required environment variables
-(SRCARCH, ARCH, srctree, KERNELVERSION, etc.) are set up correctly.
-Scripts receive the name of the Kconfig file to load in sys.argv[1]. As of
-Linux 4.1.0-rc5, this is always "Kconfig" from the kernel top-level directory.
-If an argument is provided with SCRIPT_ARG, it appears as sys.argv[2].
+Using Kconfiglib on the Linux kernel with the Makefile targets
+==============================================================
-To get an interactive Python prompt with Kconfiglib preloaded and a Config
-object 'c' created, run
+For the Linux kernel, a handy interface is provided by the
+scripts/kconfig/Makefile patch, which can be applied with either 'git am' or
+the 'patch' utility:
- $ make iscriptconfig [ARCH=<arch>]
+ $ wget -qO- https://raw.githubusercontent.com/ulfalizer/Kconfiglib/master/makefile.patch | git am
+ $ wget -qO- https://raw.githubusercontent.com/ulfalizer/Kconfiglib/master/makefile.patch | patch -p1
-Kconfiglib supports both Python 2 and Python 3. For (i)scriptconfig, the Python
-interpreter to use can be passed in PYTHONCMD, which defaults to 'python'. PyPy
-works well too, and might give a nice speedup for long-running jobs.
+Warning: Not passing -p1 to patch will cause the wrong file to be patched.
-The examples/ directory contains short example scripts, which can be run with
-e.g.
+Please tell me if the patch does not apply. It should be trivial to apply
+manually, as it's just a block of text that needs to be inserted near the other
+*conf: targets in scripts/kconfig/Makefile.
- $ make scriptconfig SCRIPT=Kconfiglib/examples/print_tree.py
+Look further down for a motivation for the Makefile patch and for instructions
+on how you can use Kconfiglib without it.
-or
+If you do not wish to install Kconfiglib via pip, the Makefile patch is set up
+so that you can also just clone Kconfiglib into the kernel root:
- $ make scriptconfig SCRIPT=Kconfiglib/examples/help_grep.py SCRIPT_ARG=kernel
+ $ git clone git://github.com/ulfalizer/Kconfiglib.git
+ $ git am Kconfiglib/makefile.patch (or 'patch -p1 < Kconfiglib/makefile.patch')
-testsuite.py contains the test suite. See the top of the script for how to run
-it.
+Warning: The directory name Kconfiglib/ is significant in this case, because
+it's added to PYTHONPATH by the new targets in makefile.patch.
-Credits: Written by Ulf "Ulfalizer" Magnusson
+The targets added by the Makefile patch are described in the following
+sections.
-Send bug reports, suggestions and other feedback to ulfalizer a.t Google's
-email service. Don't wrestle with internal APIs. Tell me what you need and I
-might add it in a safe way as a client API instead."""
-import os
-import platform
-import re
-import sys
+make kmenuconfig
+----------------
-# File layout:
-#
-# Public classes
-# Public functions
-# Internal classes
-# Internal functions
-# Internal global constants
+This target runs the curses menuconfig interface with Python 3. As of
+Kconfiglib 12.2.0, both Python 2 and Python 3 are supported (previously, only
+Python 3 was supported, so this was a backport).
-# Line length: 79 columns
-#
-# Public classes
-#
+make guiconfig
+--------------
-class Config(object):
+This target runs the Tkinter menuconfig interface. Both Python 2 and Python 3
+are supported. To change the Python interpreter used, pass
+PYTHONCMD=<executable> to 'make'. The default is 'python'.
- """Represents a Kconfig configuration, e.g. for i386 or ARM. This is the
- set of symbols and other items appearing in the configuration together with
- their values. Creating any number of Config objects -- including for
- different architectures -- is safe; Kconfiglib has no global state."""
- #
- # Public interface
- #
+make [ARCH=<arch>] iscriptconfig
+--------------------------------
- def __init__(self, filename="Kconfig", base_dir=None, print_warnings=True,
- print_undef_assign=False):
- """Creates a new Config object, representing a Kconfig configuration.
- Raises Kconfig_Syntax_Error on syntax errors.
-
- filename (default: "Kconfig"): The base Kconfig file of the
- configuration. For the Linux kernel, you'll probably want "Kconfig"
- from the top-level directory, as environment variables will make
- sure the right Kconfig is included from there
- (arch/<architecture>/Kconfig). If you are using Kconfiglib via 'make
- scriptconfig', the filename of the base base Kconfig file will be in
- sys.argv[1].
-
- base_dir (default: None): The base directory relative to which 'source'
- statements within Kconfig files will work. For the Linux kernel this
- should be the top-level directory of the kernel tree. $-references
- to existing environment variables will be expanded.
-
- If None (the default), the environment variable 'srctree' will be
- used if set, and the current directory otherwise. 'srctree' is set
- by the Linux makefiles to the top-level kernel directory. A default
- of "." would not work with an alternative build directory.
-
- print_warnings (default: True): Set to True if warnings related to this
- configuration should be printed to stderr. This can be changed later
- with Config.set_print_warnings(). It is provided as a constructor
- argument since warnings might be generated during parsing.
-
- print_undef_assign (default: False): Set to True if informational
- messages related to assignments to undefined symbols should be
- printed to stderr for this configuration. Can be changed later with
- Config.set_print_undef_assign()."""
-
- # The set of all symbols, indexed by name (a string)
- self.syms = {}
- # Python 2/3 compatibility hack. This is the only one needed.
- self.syms_iter = self.syms.values if sys.version_info[0] >= 3 else \
- self.syms.itervalues
+This target gives an interactive Python prompt where a Kconfig instance has
+been preloaded and is available in 'kconf'. To change the Python interpreter
+used, pass PYTHONCMD=<executable> to 'make'. The default is 'python'.
- # The set of all defined symbols in the configuration in the order they
- # appear in the Kconfig files. This excludes the special symbols n, m,
- # and y as well as symbols that are referenced but never defined.
- self.kconfig_syms = []
+To get a feel for the API, try evaluating and printing the symbols in
+kconf.defined_syms, and explore the MenuNode menu tree starting at
+kconf.top_node by following 'next' and 'list' pointers.
- # The set of all named choices (yes, choices can have names), indexed
- # by name (a string)
- self.named_choices = {}
+The item contained in a menu node is found in MenuNode.item (note that this can
+be one of the constants kconfiglib.MENU and kconfiglib.COMMENT), and all
+symbols and choices have a 'nodes' attribute containing their menu nodes
+(usually only one). Printing a menu node will print its item, in Kconfig
+format.
- # Lists containing all choices, menus and comments in the configuration
- self.choices = []
- self.menus = []
- self.comments = []
+If you want to look up a symbol by name, use the kconf.syms dictionary.
- def register_special_symbol(type_, name, val):
- sym = Symbol()
- sym.is_special_ = True
- sym.is_defined_ = True
- sym.config = self
- sym.name = name
- sym.type = type_
- sym.cached_val = val
- self.syms[name] = sym
- return sym
-
- # The special symbols n, m and y, used as shorthand for "n", "m" and
- # "y"
- self.n = register_special_symbol(TRISTATE, "n", "n")
- self.m = register_special_symbol(TRISTATE, "m", "m")
- self.y = register_special_symbol(TRISTATE, "y", "y")
- # DEFCONFIG_LIST uses this
- register_special_symbol(STRING, "UNAME_RELEASE", platform.uname()[2])
-
- # The symbol with "option defconfig_list" set, containing a list of
- # default .config files
- self.defconfig_sym = None
-
- # See Symbol.get_(src)arch()
- self.arch = os.environ.get("ARCH")
- self.srcarch = os.environ.get("SRCARCH")
-
- # If you set CONFIG_ in the environment, Kconfig will prefix all symbols
- # with its value when saving the configuration, instead of using the default, "CONFIG_".
- self.config_prefix = os.environ.get("CONFIG_")
- if self.config_prefix is None:
- self.config_prefix = "CONFIG_"
-
- # See Config.__init__(). We need this for get_defconfig_filename().
- self.srctree = os.environ.get("srctree")
- if self.srctree is None:
- self.srctree = "."
- self.filename = filename
- self.base_dir = self.srctree if base_dir is None else \
- os.path.expandvars(base_dir)
+make scriptconfig SCRIPT=<script> [SCRIPT_ARG=<arg>]
+----------------------------------------------------
- # The 'mainmenu' text
- self.mainmenu_text = None
+This target runs the Python script given by the SCRIPT parameter on the
+configuration. sys.argv[1] holds the name of the top-level Kconfig file
+(currently always "Kconfig" in practice), and sys.argv[2] holds the SCRIPT_ARG
+argument, if given.
- # The filename of the most recently loaded .config file
- self.config_filename = None
- # The textual header of the most recently loaded .config, uncommented
- self.config_header = None
+See the examples/ subdirectory for example scripts.
- self.print_warnings = print_warnings
- self.print_undef_assign = print_undef_assign
- self._warnings = []
- # For parsing routines that stop when finding a line belonging to a
- # different construct, these holds that line and the tokenized version
- # of that line. The purpose is to avoid having to re-tokenize the line,
- # which is inefficient and causes problems when recording references to
- # symbols.
- self.end_line = None
- self.end_line_tokens = None
+make dumpvarsconfig
+-------------------
- # See the comment in _parse_expr().
- self._cur_item = None
- self._line = None
- self._filename = None
- self._linenr = None
- self._transform_m = None
+This target prints a list of all environment variables referenced from the
+Kconfig files, together with their values. See the
+Kconfiglib/examples/dumpvars.py script.
- # Parse the Kconfig files
- self.top_block = []
- self._parse_file(filename, None, None, None, self.top_block)
+Only environment variables that are referenced via the Kconfig preprocessor
+$(FOO) syntax are included. The preprocessor was added in Linux 4.18.
- # Build Symbol.dep for all symbols
- self._build_dep()
- def get_arch(self):
- """Returns the value the environment variable ARCH had at the time the
- Config instance was created, or None if ARCH was not set. For the
- kernel, this corresponds to the architecture being built for, with
- values such as "i386" or "mips"."""
- return self.arch
-
- def get_srcarch(self):
- """Returns the value the environment variable SRCARCH had at the time
- the Config instance was created, or None if SRCARCH was not set. For
- the kernel, this corresponds to the particular arch/ subdirectory
- containing architecture-specific code."""
- return self.srcarch
-
- def get_srctree(self):
- """Returns the value the environment variable srctree had at the time
- the Config instance was created, or None if srctree was not defined.
- This variable points to the source directory and is used when building
- in a separate directory."""
- return self.srctree
-
- def get_base_dir(self):
- """Returns the base directory relative to which 'source' statements
- will work, passed as an argument to Config.__init__()."""
- return self.base_dir
-
- def get_kconfig_filename(self):
- """Returns the name of the (base) kconfig file this configuration was
- loaded from."""
- return self.filename
-
- def get_config_filename(self):
- """Returns the filename of the most recently loaded configuration file,
- or None if no configuration has been loaded."""
- return self.config_filename
-
- def get_config_header(self):
- """Returns the (uncommented) textual header of the .config file most
- recently loaded with load_config(). Returns None if no .config file has
- been loaded or if the most recently loaded .config file has no header.
- The header consists of all lines up to but not including the first line
- that either
-
- 1. Does not start with "#"
- 2. Has the form "# CONFIG_FOO is not set."
- """
- return self.config_header
-
- def get_mainmenu_text(self):
- """Returns the text of the 'mainmenu' statement (with $-references to
- symbols replaced by symbol values), or None if the configuration has no
- 'mainmenu' statement."""
- return None if self.mainmenu_text is None else \
- self._expand_sym_refs(self.mainmenu_text)
-
- def get_defconfig_filename(self):
- """Returns the name of the defconfig file, which is the first existing
- file in the list given in a symbol having 'option defconfig_list' set.
- $-references to symbols will be expanded ("$FOO bar" -> "foo bar" if
- FOO has the value "foo"). Returns None in case of no defconfig file.
- Setting 'option defconfig_list' on multiple symbols currently results
- in undefined behavior.
-
- If the environment variable 'srctree' was set when the Config was
- created, get_defconfig_filename() will first look relative to that
- directory before looking in the current directory; see
- Config.__init__().
-
- WARNING: A wart here is that scripts/kconfig/Makefile sometimes uses
- the --defconfig=<defconfig> option when calling the C implementation of
- e.g. 'make defconfig'. This option overrides the 'option
- defconfig_list' symbol, meaning the result from
- get_defconfig_filename() might not match what 'make defconfig' would
- use. That probably ought to be worked around somehow, so that this
- function always gives the "expected" result."""
- if self.defconfig_sym is None:
- return None
- for filename, cond_expr in self.defconfig_sym.def_exprs:
- if self._eval_expr(cond_expr) == "y":
- filename = self._expand_sym_refs(filename)
- # We first look in $srctree. os.path.join() won't work here as
- # an absolute path in filename would override $srctree.
- srctree_filename = os.path.normpath(self.srctree + "/" +
- filename)
- if os.path.exists(srctree_filename):
- return srctree_filename
- if os.path.exists(filename):
- return filename
- return None
+Using Kconfiglib without the Makefile targets
+=============================================
- def get_symbol(self, name):
- """Returns the symbol with name 'name', or None if no such symbol
- appears in the configuration. An alternative shorthand is conf[name],
- where conf is a Config instance, though that will instead raise
- KeyError if the symbol does not exist."""
- return self.syms.get(name)
+The make targets are only needed to pick up environment variables exported from
+the Kbuild makefiles and referenced inside Kconfig files, via e.g.
+'source "arch/$(SRCARCH)/Kconfig" and commands run via '$(shell,...)'.
- def __getitem__(self, name):
- """Returns the symbol with name 'name'. Raises KeyError if the symbol
- does not appear in the configuration."""
- return self.syms[name]
+These variables are referenced as of writing (Linux 4.18), together with sample
+values:
- def get_symbols(self, all_symbols=True):
- """Returns a list of symbols from the configuration. An alternative for
- iterating over all defined symbols (in the order of definition) is
+ srctree (.)
+ ARCH (x86)
+ SRCARCH (x86)
+ KERNELVERSION (4.18.0)
+ CC (gcc)
+ HOSTCC (gcc)
+ HOSTCXX (g++)
+ CC_VERSION_TEXT (gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0)
- for sym in config:
- ...
+Older kernels only reference ARCH, SRCARCH, and KERNELVERSION.
- which relies on Config implementing __iter__() and is equivalent to
+If your kernel is recent enough (4.18+), you can get a list of referenced
+environment variables via 'make dumpvarsconfig' (see above). Note that this
+command is added by the Makefile patch.
- for sym in config.get_symbols(False):
- ...
+To run Kconfiglib without the Makefile patch, set the environment variables
+manually:
- all_symbols (default: True): If True, all symbols -- including special
- and undefined symbols -- will be included in the result, in an
- undefined order. If False, only symbols actually defined and not
- merely referred to in the configuration will be included in the
- result, and will appear in the order that they are defined within
- the Kconfig configuration files."""
- return list(self.syms.values()) if all_symbols else self.kconfig_syms
+ $ srctree=. ARCH=x86 SRCARCH=x86 KERNELVERSION=`make kernelversion` ... python(3)
+ >>> import kconfiglib
+ >>> kconf = kconfiglib.Kconfig() # filename defaults to "Kconfig"
- def __iter__(self):
- """Convenience function for iterating over the set of all defined
- symbols in the configuration, used like
+Search the top-level Makefile for "Additional ARCH settings" to see other
+possibilities for ARCH and SRCARCH.
- for sym in conf:
- ...
- The iteration happens in the order of definition within the Kconfig
- configuration files. Symbols only referred to but not defined will not
- be included, nor will the special symbols n, m, and y. If you want to
- include such symbols as well, see config.get_symbols()."""
- return iter(self.kconfig_syms)
+Intro to symbol values
+======================
- def get_choices(self):
- """Returns a list containing all choice statements in the
- configuration, in the order they appear in the Kconfig files."""
- return self.choices
+Kconfiglib has the same assignment semantics as the C implementation.
- def get_menus(self):
- """Returns a list containing all menus in the configuration, in the
- order they appear in the Kconfig files."""
- return self.menus
+Any symbol can be assigned a value by the user (via Kconfig.load_config() or
+Symbol.set_value()), but this user value is only respected if the symbol is
+visible, which corresponds to it (currently) being visible in the menuconfig
+interface.
- def get_comments(self):
- """Returns a list containing all comments in the configuration, in the
- order they appear in the Kconfig files."""
- return self.comments
+For symbols with prompts, the visibility of the symbol is determined by the
+condition on the prompt. Symbols without prompts are never visible, so setting
+a user value on them is pointless. A warning will be printed by default if
+Symbol.set_value() is called on a promptless symbol. Assignments to promptless
+symbols are normal within a .config file, so no similar warning will be printed
+by load_config().
- def get_top_level_items(self):
- """Returns a list containing the items (symbols, menus, choices, and
- comments) at the top level of the configuration -- that is, all items
- that do not appear within a menu or choice. The items appear in the
- same order as within the configuration."""
- return self.top_block
+Dependencies from parents and 'if'/'depends on' are propagated to properties,
+including prompts, so these two configurations are logically equivalent:
- def load_config(self, filename, replace=True):
- """Loads symbol values from a file in the familiar .config format.
- Equivalent to calling Symbol.set_user_value() to set each of the
- values.
+(1)
- "# CONFIG_FOO is not set" within a .config file is treated specially
- and sets the user value of FOO to 'n'. The C implementation works the
- same way.
+ menu "menu"
+ depends on A
- filename: The .config file to load. $-references to existing
- environment variables will be expanded. For scripts to work even when
- an alternative build directory is used with the Linux kernel, you
- need to refer to the top-level kernel directory with "$srctree".
+ if B
- replace (default: True): True if the configuration should replace the
- old configuration; False if it should add to it.
+ config FOO
+ tristate "foo" if D
+ default y
+ depends on C
- Returns a list or warnings (hopefully empty)
- """
+ endif
- self._warnings = []
- # Regular expressions for parsing .config files
- _set_re_match = re.compile(r"{}(\w+)=(.*)".format(self.config_prefix)).match
- _unset_re_match = re.compile(r"# {}(\w+) is not set".format(self.config_prefix)).match
+ endmenu
- # Put this first so that a missing file doesn't screw up our state
- filename = os.path.expandvars(filename)
- line_feeder = _FileFeed(filename)
+(2)
- self.config_filename = filename
+ menu "menu"
+ depends on A
- #
- # Read header
- #
+ config FOO
+ tristate "foo" if A && B && C && D
+ default y if A && B && C
- def is_header_line(line):
- return line is not None and line.startswith("#") and \
- not _unset_re_match(line)
+ endmenu
- self.config_header = None
+In this example, A && B && C && D (the prompt condition) needs to be non-n for
+FOO to be visible (assignable). If its value is m, the symbol can only be
+assigned the value m: The visibility sets an upper bound on the value that can
+be assigned by the user, and any higher user value will be truncated down.
- line = line_feeder.peek_next()
- if is_header_line(line):
- self.config_header = ""
- while is_header_line(line_feeder.peek_next()):
- self.config_header += line_feeder.get_next()[1:]
- # Remove trailing newline
- if self.config_header.endswith("\n"):
- self.config_header = self.config_header[:-1]
+'default' properties are independent of the visibility, though a 'default' will
+often get the same condition as the prompt due to dependency propagation.
+'default' properties are used if the symbol is not visible or has no user
+value.
- #
- # Read assignments. Hotspot for some workloads.
- #
+Symbols with no user value (or that have a user value but are not visible) and
+no (active) 'default' default to n for bool/tristate symbols, and to the empty
+string for other symbol types.
- def warn_override(filename, linenr, name, old_user_val, new_user_val):
- self._warn('overriding the value of {0}. '
- 'Old value: "{1}", new value: "{2}".'
- .format(name, old_user_val, new_user_val),
- filename, linenr)
-
- # Invalidate everything to keep things simple. It might be possible to
- # improve performance for the case where multiple configurations are
- # loaded by only invalidating a symbol (and its dependent symbols) if
- # the new user value differs from the old. One complication would be
- # that symbols not mentioned in the .config must lose their user value
- # when replace = True, which is the usual case.
- if replace:
- self.unset_user_values()
- else:
- self._invalidate_all()
+'select' works similarly to symbol visibility, but sets a lower bound on the
+value of the symbol. The lower bound is determined by the value of the
+select*ing* symbol. 'select' does not respect visibility, so non-visible
+symbols can be forced to a particular (minimum) value by a select as well.
- while 1:
- line = line_feeder.get_next()
- if line is None:
- return self._warnings
+For non-bool/tristate symbols, it only matters whether the visibility is n or
+non-n: m visibility acts the same as y visibility.
- line = line.rstrip()
+Conditions on 'default' and 'select' work in mostly intuitive ways. If the
+condition is n, the 'default' or 'select' is disabled. If it is m, the
+'default' or 'select' value (the value of the selecting symbol) is truncated
+down to m.
- set_match = _set_re_match(line)
- if set_match:
- name, val = set_match.groups()
+When writing a configuration with Kconfig.write_config(), only symbols that are
+visible, have an (active) default, or are selected will get written out (note
+that this includes all symbols that would accept user values). Kconfiglib
+matches the .config format produced by the C implementations down to the
+character. This eases testing.
- if val.startswith('"'):
- if len(val) < 2 or val[-1] != '"':
- _parse_error(line, "malformed string literal",
- line_feeder.filename, line_feeder.linenr)
- # Strip quotes and remove escapings. The unescaping
- # procedure should be safe since " can only appear as \"
- # inside the string.
- val = val[1:-1].replace('\\"', '"').replace("\\\\", "\\")
+For a visible bool/tristate symbol FOO with value n, this line is written to
+.config:
- if name in self.syms:
- sym = self.syms[name]
- if sym.user_val is not None:
- warn_override(line_feeder.filename, line_feeder.linenr,
- name, sym.user_val, val)
-
- if sym.is_choice_sym:
- user_mode = sym.parent.user_mode
- if user_mode is not None and user_mode != val:
- self._warn("assignment to {0} changes mode of "
- 'containing choice from "{1}" to "{2}".'
- .format(name, val, user_mode),
- line_feeder.filename,
- line_feeder.linenr)
-
- sym._set_user_value_no_invalidate(val, True)
- else:
- if self.print_undef_assign:
- _stderr_msg('note: attempt to assign the value "{0}" '
- "to the undefined symbol {1}."
- .format(val, name),
- line_feeder.filename, line_feeder.linenr)
- else:
- unset_match = _unset_re_match(line)
- if unset_match:
- name = unset_match.group(1)
- if name in self.syms:
- sym = self.syms[name]
- if sym.user_val is not None:
- warn_override(line_feeder.filename,
- line_feeder.linenr,
- name, sym.user_val, "n")
-
- sym._set_user_value_no_invalidate("n", True)
-
- def write_config(self, filename, header=None):
- """Writes out symbol values in the familiar .config format.
-
- Kconfiglib makes sure the format matches what the C implementation
- would generate, down to whitespace. This eases testing.
-
- filename: The filename under which to save the configuration.
-
- header (default: None): A textual header that will appear at the
- beginning of the file, with each line commented out automatically.
- None means no header."""
-
- for sym in self.syms_iter():
- sym.already_written = False
-
- with open(filename, "w") as f:
- # Write header
- if header is not None:
- f.write(_comment(header) + "\n")
-
- # Build and write configuration
- conf_strings = []
- _make_block_conf(self.top_block, conf_strings.append)
- f.write("\n".join(conf_strings) + "\n")
-
- def eval(self, s):
- """Returns the value of the expression 's' -- where 's' is represented
- as a string -- in the context of the configuration. Raises
- Kconfig_Syntax_Error if syntax errors are detected in 's'.
-
- For example, if FOO and BAR are tristate symbols at least one of which
- has the value "y", then config.eval("y && (FOO || BAR)") => "y"
-
- This function always yields a tristate value. To get the value of
- non-bool, non-tristate symbols, use Symbol.get_value().
-
- The result of this function is consistent with how evaluation works for
- conditional expressions in the configuration as well as in the C
- implementation. "m" and m are rewritten as '"m" && MODULES' and 'm &&
- MODULES', respectively, and a result of "m" will get promoted to "y" if
- we're running without modules.
-
- Syntax checking is somewhat lax, partly to be compatible with lax
- parsing in the C implementation."""
- return self._eval_expr(self._parse_expr(self._tokenize(s, True), # Feed
- None, # Current symbol/choice
- s)) # line
-
- def unset_user_values(self):
- """Resets the values of all symbols, as if Config.load_config() or
- Symbol.set_user_value() had never been called."""
- for sym in self.syms_iter():
- sym._unset_user_value_no_recursive_invalidate()
-
- def set_print_warnings(self, print_warnings):
- """Determines whether warnings related to this configuration (for
- things like attempting to assign illegal values to symbols with
- Symbol.set_user_value()) should be printed to stderr.
-
- print_warnings: True if warnings should be printed."""
- self.print_warnings = print_warnings
-
- def set_print_undef_assign(self, print_undef_assign):
- """Determines whether informational messages related to assignments to
- undefined symbols should be printed to stderr for this configuration.
-
- print_undef_assign: If True, such messages will be printed."""
- self.print_undef_assign = print_undef_assign
+ # CONFIG_FOO is not set
- def __str__(self):
- """Returns a string containing various information about the Config."""
- return _lines("Configuration",
- "File : " +
- self.filename,
- "Base directory : " +
- self.base_dir,
- "Value of $ARCH at creation time : " +
- ("(not set)" if self.arch is None else self.arch),
- "Value of $SRCARCH at creation time : " +
- ("(not set)" if self.srcarch is None else
- self.srcarch),
- "Source tree (derived from $srctree;",
- "defaults to '.' if $srctree isn't set) : " +
- self.srctree,
- "Most recently loaded .config : " +
- ("(no .config loaded)"
- if self.config_filename is None else
- self.config_filename),
- "Print warnings : " +
- BOOL_STR[self.print_warnings],
- "Print assignments to undefined symbols : " +
- BOOL_STR[self.print_undef_assign])
+The point is to remember the user n selection (which might differ from the
+default value the symbol would get), while at the same sticking to the rule
+that undefined corresponds to n (.config uses Makefile format, making the line
+above a comment). When the .config file is read back in, this line will be
+treated the same as the following assignment:
- #
- # Private methods
- #
+ CONFIG_FOO=n
- #
- # Kconfig parsing
- #
+In Kconfiglib, the set of (currently) assignable values for a bool/tristate
+symbol appear in Symbol.assignable. For other symbol types, just check if
+sym.visibility is non-0 (non-n) to see whether the user value will have an
+effect.
- def _parse_file(self, filename, parent, deps, visible_if_deps, block):
- """Parses the Kconfig file 'filename'. Appends the Items in the file
- (and any file it sources) to the list passed in the 'block' parameter.
- See _parse_block() for the meaning of the parameters."""
- self._parse_block(_FileFeed(filename), None, parent, deps,
- visible_if_deps, block)
- def _parse_block(self, line_feeder, end_marker, parent, deps,
- visible_if_deps, block):
- """Parses a block, which is the contents of either a file or an if,
- menu, or choice statement. Appends the Items to the list passed in the
- 'block' parameter.
+Intro to the menu tree
+======================
- line_feeder: A _FileFeed instance feeding lines from a file. The
- Kconfig language is line-based in practice.
+The menu structure, as seen in e.g. menuconfig, is represented by a tree of
+MenuNode objects. The top node of the configuration corresponds to an implicit
+top-level menu, the title of which is shown at the top in the standard
+menuconfig interface. (The title is also available in Kconfig.mainmenu_text in
+Kconfiglib.)
- end_marker: The token that ends the block, e.g. T_ENDIF ("endif") for
- ifs. None for files.
+The top node is found in Kconfig.top_node. From there, you can visit child menu
+nodes by following the 'list' pointer, and any following menu nodes by
+following the 'next' pointer. Usually, a non-None 'list' pointer indicates a
+menu or Choice, but menu nodes for symbols can sometimes have a non-None 'list'
+pointer too due to submenus created implicitly from dependencies.
- parent: The enclosing menu or choice, or None if we're at the top
- level.
+MenuNode.item is either a Symbol or a Choice object, or one of the constants
+MENU and COMMENT. The prompt of the menu node can be found in MenuNode.prompt,
+which also holds the title for menus and comments. For Symbol and Choice,
+MenuNode.help holds the help text (if any, otherwise None).
- deps: Dependencies from enclosing menus, choices and ifs.
+Most symbols will only have a single menu node. A symbol defined in multiple
+locations will have one menu node for each location. The list of menu nodes for
+a Symbol or Choice can be found in the Symbol/Choice.nodes attribute.
- visible_if_deps (default: None): 'visible if' dependencies from
- enclosing menus.
+Note that prompts and help texts for symbols and choices are stored in their
+menu node(s) rather than in the Symbol or Choice objects themselves. This makes
+it possible to define a symbol in multiple locations with a different prompt or
+help text in each location. To get the help text or prompt for a symbol with a
+single menu node, do sym.nodes[0].help and sym.nodes[0].prompt, respectively.
+The prompt is a (text, condition) tuple, where condition determines the
+visibility (see 'Intro to expressions' below).
- block: The list to add items to."""
+This organization mirrors the C implementation. MenuNode is called
+'struct menu' there, but I thought "menu" was a confusing name.
- while 1:
- # Do we already have a tokenized line that we determined wasn't
- # part of whatever we were parsing earlier? See comment in
- # Config.__init__().
- if self.end_line is not None:
- line = self.end_line
- tokens = self.end_line_tokens
- tokens.unget_all()
-
- self.end_line = None
- self.end_line_tokens = None
- else:
- line = line_feeder.get_next()
- if line is None:
- if end_marker is not None:
- raise Kconfig_Syntax_Error("Unexpected end of file {0}"
- .format(line_feeder.filename))
- return
+It is possible to give a Choice a name and define it in multiple locations,
+hence why Choice.nodes is also a list.
- tokens = self._tokenize(line, False, line_feeder.filename,
- line_feeder.linenr)
+As a convenience, the properties added at a particular definition location are
+available on the MenuNode itself, in e.g. MenuNode.defaults. This is helpful
+when generating documentation, so that symbols/choices defined in multiple
+locations can be shown with the correct properties at each location.
- t0 = tokens.get_next()
- if t0 is None:
- continue
- # Cases are ordered roughly by frequency, which speeds things up a
- # bit
-
- if t0 == T_CONFIG or t0 == T_MENUCONFIG:
- # The tokenizer will automatically allocate a new Symbol object
- # for any new names it encounters, so we don't need to worry
- # about that here.
- sym = tokens.get_next()
-
- # Symbols defined in multiple places get the parent of their
- # first definition. However, for symbols whose parents are
- # choice statements, the choice statement takes precedence.
- if not sym.is_defined_ or isinstance(parent, Choice):
- sym.parent = parent
- sym.is_defined_ = True
-
- self._parse_properties(line_feeder, sym, deps, visible_if_deps)
-
- self.kconfig_syms.append(sym)
- block.append(sym)
-
- elif t0 == T_SOURCE:
- kconfig_file = tokens.get_next()
- exp_kconfig_file = self._expand_sym_refs(kconfig_file)
- f = os.path.join(self.base_dir, exp_kconfig_file)
- if not os.path.exists(f):
- raise IOError('{0}:{1}: sourced file "{2}" (expands to '
- '"{3}") not found. Perhaps base_dir '
- '(argument to Config.__init__(), currently '
- '"{4}") is set to the wrong value.'
- .format(line_feeder.filename,
- line_feeder.linenr,
- kconfig_file, exp_kconfig_file,
- self.base_dir))
- # Add items to the same block
- self._parse_file(f, parent, deps, visible_if_deps, block)
-
- elif t0 == end_marker:
- # We have reached the end of the block
- return
+Intro to expressions
+====================
- elif t0 == T_IF:
- # If statements are treated as syntactic sugar for adding
- # dependencies to enclosed items and do not have an explicit
- # object representation.
-
- dep_expr = self._parse_expr(tokens, None, line,
- line_feeder.filename,
- line_feeder.linenr)
- # Add items to the same block
- self._parse_block(line_feeder, T_ENDIF, parent,
- _make_and(dep_expr, deps),
- visible_if_deps, block)
-
- elif t0 == T_COMMENT:
- comment = Comment()
- comment.config = self
- comment.parent = parent
- comment.filename = line_feeder.filename
- comment.linenr = line_feeder.linenr
- comment.text = tokens.get_next()
-
- self._parse_properties(line_feeder, comment, deps,
- visible_if_deps)
-
- self.comments.append(comment)
- block.append(comment)
-
- elif t0 == T_MENU:
- menu = Menu()
- menu.config = self
- menu.parent = parent
- menu.filename = line_feeder.filename
- menu.linenr = line_feeder.linenr
- menu.title = tokens.get_next()
-
- self._parse_properties(line_feeder, menu, deps,
- visible_if_deps)
-
- # This needs to go before _parse_block() so that we get the
- # proper menu ordering in the case of nested functions
- self.menus.append(menu)
- # Parse contents and put Items in menu.block
- self._parse_block(line_feeder, T_ENDMENU, menu, menu.dep_expr,
- _make_and(visible_if_deps,
- menu.visible_if_expr),
- menu.block)
-
- block.append(menu)
-
- elif t0 == T_CHOICE:
- name = tokens.get_next()
- if name is None:
- choice = Choice()
- self.choices.append(choice)
- else:
- # Named choice
- choice = self.named_choices.get(name)
- if choice is None:
- choice = Choice()
- choice.name = name
- self.named_choices[name] = choice
- self.choices.append(choice)
+Expressions can be evaluated with the expr_value() function and printed with
+the expr_str() function (these are used internally as well). Evaluating an
+expression always yields a tristate value, where n, m, and y are represented as
+0, 1, and 2, respectively.
- choice.config = self
- choice.parent = parent
+The following table should help you figure out how expressions are represented.
+A, B, C, ... are symbols (Symbol instances), NOT is the kconfiglib.NOT
+constant, etc.
- choice.def_locations.append((line_feeder.filename,
- line_feeder.linenr))
+Expression Representation
+---------- --------------
+A A
+"A" A (constant symbol)
+!A (NOT, A)
+A && B (AND, A, B)
+A && B && C (AND, A, (AND, B, C))
+A || B (OR, A, B)
+A || (B && C && D) (OR, A, (AND, B, (AND, C, D)))
+A = B (EQUAL, A, B)
+A != "foo" (UNEQUAL, A, foo (constant symbol))
+A && B = C && D (AND, A, (AND, (EQUAL, B, C), D))
+n Kconfig.n (constant symbol)
+m Kconfig.m (constant symbol)
+y Kconfig.y (constant symbol)
+"y" Kconfig.y (constant symbol)
- self._parse_properties(line_feeder, choice, deps,
- visible_if_deps)
+Strings like "foo" in 'default "foo"' or 'depends on SYM = "foo"' are
+represented as constant symbols, so the only values that appear in expressions
+are symbols***. This mirrors the C implementation.
- # Parse contents and put Items in choice.block
- self._parse_block(line_feeder, T_ENDCHOICE, choice, deps,
- visible_if_deps, choice.block)
+***For choice symbols, the parent Choice will appear in expressions as well,
+but it's usually invisible as the value interfaces of Symbol and Choice are
+identical. This mirrors the C implementation and makes different choice modes
+"just work".
- choice._determine_actual_symbols()
+Manual evaluation examples:
- # If no type is specified for the choice, its type is that of
- # the first choice item with a specified type
- if choice.type == UNKNOWN:
- for item in choice.actual_symbols:
- if item.type != UNKNOWN:
- choice.type = item.type
- break
+ - The value of A && B is min(A.tri_value, B.tri_value)
- # Each choice item of UNKNOWN type gets the type of the choice
- for item in choice.actual_symbols:
- if item.type == UNKNOWN:
- item.type = choice.type
+ - The value of A || B is max(A.tri_value, B.tri_value)
- block.append(choice)
+ - The value of !A is 2 - A.tri_value
- elif t0 == T_MAINMENU:
- text = tokens.get_next()
- if self.mainmenu_text is not None:
- self._warn("overriding 'mainmenu' text. "
- 'Old value: "{0}", new value: "{1}".'
- .format(self.mainmenu_text, text),
- line_feeder.filename, line_feeder.linenr)
- self.mainmenu_text = text
+ - The value of A = B is 2 (y) if A.str_value == B.str_value, and 0 (n)
+ otherwise. Note that str_value is used here instead of tri_value.
- else:
- _parse_error(line, "unrecognized construct",
- line_feeder.filename, line_feeder.linenr)
-
- def _parse_properties(self, line_feeder, stmt, deps, visible_if_deps):
- """Parsing of properties for symbols, menus, choices, and comments.
- Takes care of propagating dependencies from enclosing menus and ifs."""
-
- def parse_val_and_cond(tokens, line, filename, linenr):
- """Parses '<expr1> if <expr2>' constructs, where the 'if' part is
- optional. Returns a tuple containing the parsed expressions, with
- None as the second element if the 'if' part is missing."""
- return (self._parse_expr(tokens, stmt, line, filename, linenr,
- False),
- self._parse_expr(tokens, stmt, line, filename, linenr)
- if tokens.check(T_IF) else None)
-
- # In case the symbol is defined in multiple locations, we need to
- # remember what prompts, defaults, selects, and implies are new for
- # this definition, as "depends on" should only apply to the local
- # definition.
- new_prompt = None
- new_def_exprs = []
- new_selects = []
- new_implies = []
-
- # Dependencies from 'depends on' statements
- depends_on_expr = None
+ For constant (as well as undefined) symbols, str_value matches the name of
+ the symbol. This mirrors the C implementation and explains why
+ 'depends on SYM = "foo"' above works as expected.
- while 1:
- line = line_feeder.get_next()
- if line is None:
- break
+n/m/y are automatically converted to the corresponding constant symbols
+"n"/"m"/"y" (Kconfig.n/m/y) during parsing.
- filename = line_feeder.filename
- linenr = line_feeder.linenr
+Kconfig.const_syms is a dictionary like Kconfig.syms but for constant symbols.
- tokens = self._tokenize(line, False, filename, linenr)
+If a condition is missing (e.g., <cond> when the 'if <cond>' is removed from
+'default A if <cond>'), it is actually Kconfig.y. The standard __str__()
+functions just avoid printing 'if y' conditions to give cleaner output.
- t0 = tokens.get_next()
- if t0 is None:
- continue
- # Cases are ordered roughly by frequency, which speeds things up a
- # bit
+Kconfig extensions
+==================
- if t0 == T_DEPENDS:
- if not tokens.check(T_ON):
- _parse_error(line, 'expected "on" after "depends"',
- filename, linenr)
+Kconfiglib includes a couple of Kconfig extensions:
- parsed_deps = self._parse_expr(tokens, stmt, line, filename,
- linenr)
+'source' with relative path
+---------------------------
- if isinstance(stmt, (Menu, Comment)):
- stmt.orig_deps = _make_and(stmt.orig_deps, parsed_deps)
- else:
- depends_on_expr = _make_and(depends_on_expr, parsed_deps)
-
- elif t0 == T_HELP:
- # Find first non-blank (not all-space) line and get its
- # indentation
- line = line_feeder.next_nonblank()
- if line is None:
- stmt.help = ""
- break
- indent = _indentation(line)
- if indent == 0:
- # If the first non-empty lines has zero indent, there is no
- # help text
- stmt.help = ""
- line_feeder.unget()
- break
+The 'rsource' statement sources Kconfig files with a path relative to directory
+of the Kconfig file containing the 'rsource' statement, instead of relative to
+the project root.
- # The help text goes on till the first non-empty line with less
- # indent
- help_lines = [_deindent(line, indent)]
- while 1:
- line = line_feeder.get_next()
- if line is None or \
- (not line.isspace() and _indentation(line) < indent):
- stmt.help = "".join(help_lines)
- break
- help_lines.append(_deindent(line, indent))
+Consider following directory tree:
- if line is None:
- break
+ Project
+ +--Kconfig
+ |
+ +--src
+ +--Kconfig
+ |
+ +--SubSystem1
+ +--Kconfig
+ |
+ +--ModuleA
+ +--Kconfig
- line_feeder.unget()
-
- elif t0 == T_SELECT:
- target = tokens.get_next()
-
- stmt.referenced_syms.add(target)
- stmt.selected_syms.add(target)
-
- new_selects.append(
- (target,
- self._parse_expr(tokens, stmt, line, filename, linenr)
- if tokens.check(T_IF) else None))
-
- elif t0 == T_IMPLY:
- target = tokens.get_next()
-
- stmt.referenced_syms.add(target)
- stmt.implied_syms.add(target)
-
- new_implies.append(
- (target,
- self._parse_expr(tokens, stmt, line, filename, linenr)
- if tokens.check(T_IF) else None))
-
- elif t0 in (T_BOOL, T_TRISTATE, T_INT, T_HEX, T_STRING):
- stmt.type = TOKEN_TO_TYPE[t0]
- if tokens.peek_next() is not None:
- new_prompt = parse_val_and_cond(tokens, line, filename,
- linenr)
-
- elif t0 == T_DEFAULT:
- new_def_exprs.append(parse_val_and_cond(tokens, line, filename,
- linenr))
-
- elif t0 == T_DEF_BOOL:
- stmt.type = BOOL
- if tokens.peek_next() is not None:
- new_def_exprs.append(parse_val_and_cond(tokens, line,
- filename, linenr))
-
- elif t0 == T_PROMPT:
- # 'prompt' properties override each other within a single
- # definition of a symbol, but additional prompts can be added
- # by defining the symbol multiple times; hence 'new_prompt'
- # instead of 'prompt'.
- new_prompt = parse_val_and_cond(tokens, line, filename, linenr)
-
- elif t0 == T_RANGE:
- low = tokens.get_next()
- high = tokens.get_next()
- stmt.referenced_syms.add(low)
- stmt.referenced_syms.add(high)
-
- stmt.ranges.append(
- (low, high,
- self._parse_expr(tokens, stmt, line, filename, linenr)
- if tokens.check(T_IF) else None))
-
- elif t0 == T_DEF_TRISTATE:
- stmt.type = TRISTATE
- if tokens.peek_next() is not None:
- new_def_exprs.append(parse_val_and_cond(tokens, line,
- filename, linenr))
-
- elif t0 == T_OPTION:
- if tokens.check(T_ENV) and tokens.check(T_EQUAL):
- env_var = tokens.get_next()
-
- stmt.is_special_ = True
- stmt.is_from_env = True
-
- if env_var not in os.environ:
- self._warn("The symbol {0} references the "
- "non-existent environment variable {1} and "
- "will get the empty string as its value. "
- "If you're using Kconfiglib via "
- "'make (i)scriptconfig', it should have "
- "set up the environment correctly for you. "
- "If you still got this message, that "
- "might be an error, and you should email "
- "ulfalizer a.t Google's email service."""
- .format(stmt.name, env_var),
- filename, linenr)
-
- stmt.cached_val = ""
- else:
- stmt.cached_val = os.environ[env_var]
+In this example, assume that src/SubSystem1/Kconfig wants to source
+src/SubSystem1/ModuleA/Kconfig.
- elif tokens.check(T_DEFCONFIG_LIST):
- self.defconfig_sym = stmt
+With 'source', this statement would be used:
- elif tokens.check(T_MODULES):
- # To reduce warning spam, only warn if 'option modules' is
- # set on some symbol that isn't MODULES, which should be
- # safe. I haven't run into any projects that make use
- # modules besides the kernel yet, and there it's likely to
- # keep being called "MODULES".
- if stmt.name != "MODULES":
- self._warn("the 'modules' option is not supported. "
- "Let me know if this is a problem for you; "
- "it shouldn't be that hard to implement. "
- "(Note that modules are still supported -- "
- "Kconfiglib just assumes the symbol name "
- "MODULES, like older versions of the C "
- "implementation did when 'option modules' "
- "wasn't used.)",
- filename, linenr)
+ source "src/SubSystem1/ModuleA/Kconfig"
- elif tokens.check(T_ALLNOCONFIG_Y):
- if not isinstance(stmt, Symbol):
- _parse_error(line,
- "the 'allnoconfig_y' option is only "
- "valid for symbols",
- filename, linenr)
- stmt.allnoconfig_y = True
+With 'rsource', this turns into
- else:
- _parse_error(line, "unrecognized option", filename, linenr)
-
- elif t0 == T_VISIBLE:
- if not tokens.check(T_IF):
- _parse_error(line, 'expected "if" after "visible"',
- filename, linenr)
- if not isinstance(stmt, Menu):
- _parse_error(line,
- "'visible if' is only valid for menus",
- filename, linenr)
-
- parsed_deps = self._parse_expr(tokens, stmt, line, filename,
- linenr)
- stmt.visible_if_expr = _make_and(stmt.visible_if_expr,
- parsed_deps)
-
- elif t0 == T_OPTIONAL:
- if not isinstance(stmt, Choice):
- _parse_error(line,
- '"optional" is only valid for choices',
- filename,
- linenr)
- stmt.optional = True
+ rsource "ModuleA/Kconfig"
- else:
- # See comment in Config.__init__()
- self.end_line = line
- self.end_line_tokens = tokens
- break
+If an absolute path is given to 'rsource', it acts the same as 'source'.
- # Done parsing properties. Now propagate 'depends on' and enclosing
- # menu/if dependencies to expressions.
+'rsource' can be used to create "position-independent" Kconfig trees that can
+be moved around freely.
- # The set of symbols referenced directly by the statement plus all
- # symbols referenced by enclosing menus and ifs
- stmt.all_referenced_syms = stmt.referenced_syms | _get_expr_syms(deps)
- # Save original dependencies from enclosing menus and ifs
- stmt.deps_from_containing = deps
+Globbing 'source'
+-----------------
- if isinstance(stmt, (Menu, Comment)):
- stmt.dep_expr = _make_and(stmt.orig_deps, deps)
- else:
- # Symbol or Choice
-
- # See comment for 'menu_dep'
- stmt.menu_dep = _make_and(deps, depends_on_expr)
-
- # Propagate dependencies to prompts
-
- if new_prompt is not None:
- prompt, cond_expr = new_prompt
- # Propagate 'visible if' dependencies from menus and local
- # 'depends on' dependencies
- cond_expr = _make_and(_make_and(cond_expr, visible_if_deps),
- depends_on_expr)
- # Save original
- stmt.orig_prompts.append((prompt, cond_expr))
- # Finalize with dependencies from enclosing menus and ifs
- stmt.prompts.append((prompt, _make_and(cond_expr, deps)))
-
- # Propagate dependencies to defaults
-
- # Propagate 'depends on' dependencies
- new_def_exprs = [(val_expr, _make_and(cond_expr, depends_on_expr))
- for val_expr, cond_expr in new_def_exprs]
- # Save original
- stmt.orig_def_exprs.extend(new_def_exprs)
- # Finalize with dependencies from enclosing menus and ifs
- stmt.def_exprs.extend([(val_expr, _make_and(cond_expr, deps))
- for val_expr, cond_expr in new_def_exprs])
-
- # Propagate dependencies to selects and implies
-
- # Only symbols can select and imply
- if isinstance(stmt, Symbol):
- # Propagate 'depends on' dependencies
- new_selects = [(target, _make_and(cond_expr, depends_on_expr))
- for target, cond_expr in new_selects]
- new_implies = [(target, _make_and(cond_expr, depends_on_expr))
- for target, cond_expr in new_implies]
- # Save original
- stmt.orig_selects.extend(new_selects)
- stmt.orig_implies.extend(new_implies)
- # Finalize with dependencies from enclosing menus and ifs
- for target, cond in new_selects:
- target.rev_dep = \
- _make_or(target.rev_dep,
- _make_and(stmt, _make_and(cond, deps)))
- for target, cond in new_implies:
- target.weak_rev_dep = \
- _make_or(target.weak_rev_dep,
- _make_and(stmt, _make_and(cond, deps)))
-
- def _parse_expr(self, feed, cur_item, line, filename=None, linenr=None,
- transform_m=True):
- """Parses an expression from the tokens in 'feed' using a simple
- top-down approach. The result has the form
- '(<operator>, [<parsed operands>])', where <operator> is e.g.
- kconfiglib.AND. If there is only one operand (i.e., no && or ||), then
- the operand is returned directly. This also goes for subexpressions.
-
- feed: _Feed instance containing the tokens for the expression.
-
- cur_item: The item (Symbol, Choice, Menu, or Comment) currently being
- parsed, or None if we're not parsing an item. Used for recording
- references to symbols.
-
- line: The line containing the expression being parsed.
-
- filename (default: None): The file containing the expression.
-
- linenr (default: None): The line number containing the expression.
-
- transform_m (default: False): Determines if 'm' should be rewritten to
- 'm && MODULES' -- see parse_val_and_cond().
-
- Expression grammar, in decreasing order of precedence:
-
- <expr> -> <symbol>
- <symbol> '=' <symbol>
- <symbol> '!=' <symbol>
- '(' <expr> ')'
- '!' <expr>
- <expr> '&&' <expr>
- <expr> '||' <expr>"""
-
- # Use instance variables to avoid having to pass these as arguments
- # through the top-down parser in _parse_expr_rec(), which is tedious
- # and obfuscates the code. A profiler run shows no noticeable
- # performance difference.
- self._cur_item = cur_item
- self._transform_m = transform_m
- self._line = line
- self._filename = filename
- self._linenr = linenr
-
- return self._parse_expr_rec(feed)
-
- def _parse_expr_rec(self, feed):
- or_term = self._parse_or_term(feed)
- if not feed.check(T_OR):
- # Common case -- no need for an OR node since it's just a single
- # operand
- return or_term
- or_terms = [or_term, self._parse_or_term(feed)]
- while feed.check(T_OR):
- or_terms.append(self._parse_or_term(feed))
- return (OR, or_terms)
-
- def _parse_or_term(self, feed):
- and_term = self._parse_factor(feed)
- if not feed.check(T_AND):
- # Common case -- no need for an AND node since it's just a single
- # operand
- return and_term
- and_terms = [and_term, self._parse_factor(feed)]
- while feed.check(T_AND):
- and_terms.append(self._parse_factor(feed))
- return (AND, and_terms)
-
- def _parse_factor(self, feed):
- token = feed.get_next()
-
- if isinstance(token, (Symbol, str)):
- if self._cur_item is not None and isinstance(token, Symbol):
- self._cur_item.referenced_syms.add(token)
-
- next_token = feed.peek_next()
- # For conditional expressions ('depends on <expr>',
- # '... if <expr>', # etc.), "m" and m are rewritten to
- # "m" && MODULES.
- if next_token != T_EQUAL and next_token != T_UNEQUAL:
- if self._transform_m and (token is self.m or token == "m"):
- return (AND, ["m", self._sym_lookup("MODULES")])
- return token
+'source' and 'rsource' accept glob patterns, sourcing all matching Kconfig
+files. They require at least one matching file, raising a KconfigError
+otherwise.
- relation = EQUAL if (feed.get_next() == T_EQUAL) else UNEQUAL
- token_2 = feed.get_next()
- if self._cur_item is not None and isinstance(token_2, Symbol):
- self._cur_item.referenced_syms.add(token_2)
- return (relation, token, token_2)
+For example, the following statement might source sub1/foofoofoo and
+sub2/foobarfoo:
- if token == T_NOT:
- return (NOT, self._parse_factor(feed))
+ source "sub[12]/foo*foo"
- if token == T_OPEN_PAREN:
- expr_parse = self._parse_expr_rec(feed)
- if not feed.check(T_CLOSE_PAREN):
- _parse_error(self._line, "missing end parenthesis",
- self._filename, self._linenr)
- return expr_parse
+The glob patterns accepted are the same as for the standard glob.glob()
+function.
- _parse_error(self._line, "malformed expression", self._filename,
- self._linenr)
+Two additional statements are provided for cases where it's acceptable for a
+pattern to match no files: 'osource' and 'orsource' (the o is for "optional").
- def _tokenize(self, s, for_eval, filename=None, linenr=None):
- """Returns a _Feed instance containing tokens derived from the string
- 's'. Registers any new symbols encountered (via _sym_lookup()).
+For example, the following statements will be no-ops if neither "foo" nor any
+files matching "bar*" exist:
- (I experimented with a pure regular expression implementation, but it
- came out slower, less readable, and wouldn't have been as flexible.)
+ osource "foo"
+ osource "bar*"
- for_eval: True when parsing an expression for a call to Config.eval(),
- in which case we should not treat the first token specially nor
- register new symbols."""
+'orsource' does a relative optional source.
- s = s.strip()
- if s == "" or s[0] == "#":
- return _Feed([])
+'source' and 'osource' are analogous to 'include' and '-include' in Make.
- if for_eval:
- previous = None # The previous token seen
- tokens = []
- i = 0 # The current index in the string being tokenized
- else:
- # The initial word on a line is parsed specially. Let
- # command_chars = [A-Za-z0-9_]. Then
- # - leading non-command_chars characters are ignored, and
- # - the first token consists the following one or more
- # command_chars characters.
- # This is why things like "----help--" are accepted.
- initial_token_match = _initial_token_re_match(s)
- if initial_token_match is None:
- return _Feed([])
- keyword = _get_keyword(initial_token_match.group(1))
- if keyword == T_HELP:
- # Avoid junk after "help", e.g. "---", being registered as a
- # symbol
- return _Feed([T_HELP])
- if keyword is None:
- # We expect a keyword as the first token
- _tokenization_error(s, filename, linenr)
-
- previous = keyword
- tokens = [keyword]
- # The current index in the string being tokenized
- i = initial_token_match.end()
-
- # _tokenize() is a hotspot during parsing, and this speeds things up a
- # bit
- strlen = len(s)
- append = tokens.append
-
- # Main tokenization loop. (Handles tokens past the first one.)
- while i < strlen:
- # Test for an identifier/keyword preceded by whitespace first; this
- # is the most common case.
- id_keyword_match = _id_keyword_re_match(s, i)
- if id_keyword_match:
- # We have an identifier or keyword. The above also stripped any
- # whitespace for us.
- name = id_keyword_match.group(1)
- # Jump past it
- i = id_keyword_match.end()
+Generalized def_* keywords
+--------------------------
- keyword = _get_keyword(name)
- if keyword is not None:
- # It's a keyword
- append(keyword)
- elif previous in STRING_LEX:
- # What would ordinarily be considered an identifier is
- # treated as a string after certain tokens
- append(name)
- else:
- # It's a symbol name. _sym_lookup() will take care of
- # allocating a new Symbol instance if it's the first time
- # we see it.
- sym = self._sym_lookup(name, for_eval)
-
- if previous == T_CONFIG or previous == T_MENUCONFIG:
- # If the previous token is T_(MENU)CONFIG
- # ("(menu)config"), we're tokenizing the first line of
- # a symbol definition, and should remember this as a
- # location where the symbol is defined
- sym.def_locations.append((filename, linenr))
- else:
- # Otherwise, it's a reference to the symbol
- sym.ref_locations.append((filename, linenr))
+def_int, def_hex, and def_string are available in addition to def_bool and
+def_tristate, allowing int, hex, and string symbols to be given a type and a
+default at the same time.
- append(sym)
- else:
- # Not an identifier/keyword
+Extra optional warnings
+-----------------------
- while i < strlen and s[i].isspace():
- i += 1
- if i == strlen:
- break
- c = s[i]
- i += 1
+Some optional warnings can be controlled via environment variables:
- # String literal (constant symbol)
- if c == '"' or c == "'":
- if "\\" in s:
- # Slow path: This could probably be sped up, but it's a
- # very unusual case anyway.
- quote = c
- val = ""
- while 1:
- if i >= len(s):
- _tokenization_error(s, filename, linenr)
- c = s[i]
- if c == quote:
- break
- if c == "\\":
- if i + 1 >= len(s):
- _tokenization_error(s, filename, linenr)
- val += s[i + 1]
- i += 2
- else:
- val += c
- i += 1
- i += 1
- append(val)
- else:
- # Fast path: If the string contains no backslashes
- # (almost always) we can simply look for the matching
- # quote.
- end = s.find(c, i)
- if end == -1:
- _tokenization_error(s, filename, linenr)
- append(s[i:end])
- i = end + 1
-
- elif c == "&":
- # Invalid characters are ignored
- if i >= len(s) or s[i] != "&": continue
- append(T_AND)
- i += 1
+ - KCONFIG_WARN_UNDEF: If set to 'y', warnings will be generated for all
+ references to undefined symbols within Kconfig files. The only gotcha is
+ that all hex literals must be prefixed with "0x" or "0X", to make it
+ possible to distinguish them from symbol references.
- elif c == "|":
- # Invalid characters are ignored
- if i >= len(s) or s[i] != "|": continue
- append(T_OR)
- i += 1
+ Some projects (e.g. the Linux kernel) use multiple Kconfig trees with many
+ shared Kconfig files, leading to some safe undefined symbol references.
+ KCONFIG_WARN_UNDEF is useful in projects that only have a single Kconfig
+ tree though.
- elif c == "!":
- if i < len(s) and s[i] == "=":
- append(T_UNEQUAL)
- i += 1
- else:
- append(T_NOT)
+ KCONFIG_STRICT is an older alias for this environment variable, supported
+ for backwards compatibility.
- elif c == "=": append(T_EQUAL)
- elif c == "(": append(T_OPEN_PAREN)
- elif c == ")": append(T_CLOSE_PAREN)
- elif c == "#": break # Comment
+ - KCONFIG_WARN_UNDEF_ASSIGN: If set to 'y', warnings will be generated for
+ all assignments to undefined symbols within .config files. By default, no
+ such warnings are generated.
- else: continue # Invalid characters are ignored
+ This warning can also be enabled/disabled via the Kconfig.warn_assign_undef
+ variable.
- previous = tokens[-1]
- return _Feed(tokens)
+Preprocessor user functions defined in Python
+---------------------------------------------
- def _sym_lookup(self, name, for_eval=False):
- """Fetches the symbol 'name' from the symbol table, creating and
- registering it if it does not exist. If 'for_eval' is True, the symbol
- won't be added to the symbol table if it does not exist -- this is for
- Config.eval()."""
- if name in self.syms:
- return self.syms[name]
+Preprocessor functions can be defined in Python, which makes it simple to
+integrate information from existing Python tools into Kconfig (e.g. to have
+Kconfig symbols depend on hardware information stored in some other format).
- new_sym = Symbol()
- new_sym.config = self
- new_sym.name = name
- if for_eval:
- self._warn("no symbol {0} in configuration".format(name))
- else:
- self.syms[name] = new_sym
- return new_sym
+Putting a Python module named kconfigfunctions(.py) anywhere in sys.path will
+cause it to be imported by Kconfiglib (in Kconfig.__init__()). Note that
+sys.path can be customized via PYTHONPATH, and includes the directory of the
+module being run by default, as well as installation directories.
- #
- # Expression evaluation
- #
+If the KCONFIG_FUNCTIONS environment variable is set, it gives a different
+module name to use instead of 'kconfigfunctions'.
- def _eval_expr(self, expr):
- """Evaluates an expression to "n", "m", or "y"."""
+The imported module is expected to define a global dictionary named 'functions'
+that maps function names to Python functions, as follows:
- # Handles e.g. an "x if y" condition where the "if y" part is missing.
- if expr is None:
- return "y"
+ def my_fn(kconf, name, arg_1, arg_2, ...):
+ # kconf:
+ # Kconfig instance
+ #
+ # name:
+ # Name of the user-defined function ("my-fn"). Think argv[0].
+ #
+ # arg_1, arg_2, ...:
+ # Arguments passed to the function from Kconfig (strings)
+ #
+ # Returns a string to be substituted as the result of calling the
+ # function
+ ...
- res = self._eval_expr_rec(expr)
- if res == "m":
- # Promote "m" to "y" if we're running without modules.
- #
- # Internally, "m" is often rewritten to "m" && MODULES by both the
- # C implementation and Kconfiglib, which takes care of cases where
- # "m" should be demoted to "n" instead.
- modules_sym = self.syms.get("MODULES")
- if modules_sym is None or modules_sym.get_value() != "y":
- return "y"
- return res
+ def my_other_fn(kconf, name, arg_1, arg_2, ...):
+ ...
- def _eval_expr_rec(self, expr):
- if isinstance(expr, Symbol):
- # Non-bool/tristate symbols are always "n" in a tristate sense,
- # regardless of their value
- if expr.type != BOOL and expr.type != TRISTATE:
- return "n"
- return expr.get_value()
-
- if isinstance(expr, str):
- return expr if (expr == "y" or expr == "m") else "n"
-
- # Ordered by frequency
-
- if expr[0] == AND:
- res = "y"
- for subexpr in expr[1]:
- ev = self._eval_expr_rec(subexpr)
- # Return immediately upon discovering an "n" term
- if ev == "n":
- return "n"
- if ev == "m":
- res = "m"
- # 'res' is either "m" or "y" here; we already handled the
- # short-circuiting "n" case in the loop.
- return res
+ functions = {
+ "my-fn": (my_fn, <min.args>, <max.args>/None),
+ "my-other-fn": (my_other_fn, <min.args>, <max.args>/None),
+ ...
+ }
- if expr[0] == NOT:
- ev = self._eval_expr_rec(expr[1])
- if ev == "y":
- return "n"
- return "y" if (ev == "n") else "m"
-
- if expr[0] == OR:
- res = "n"
- for subexpr in expr[1]:
- ev = self._eval_expr_rec(subexpr)
- # Return immediately upon discovering a "y" term
- if ev == "y":
- return "y"
- if ev == "m":
- res = "m"
- # 'res' is either "n" or "m" here; we already handled the
- # short-circuiting "y" case in the loop.
- return res
+ ...
- if expr[0] == EQUAL:
- return "y" if (_str_val(expr[1]) == _str_val(expr[2])) else "n"
+<min.args> and <max.args> are the minimum and maximum number of arguments
+expected by the function (excluding the implicit 'name' argument). If
+<max.args> is None, there is no upper limit to the number of arguments. Passing
+an invalid number of arguments will generate a KconfigError exception.
- if expr[0] == UNEQUAL:
- return "y" if (_str_val(expr[1]) != _str_val(expr[2])) else "n"
+Functions can access the current parsing location as kconf.filename/linenr.
+Accessing other fields of the Kconfig object is not safe. See the warning
+below.
- _internal_error("Internal error while evaluating expression: "
- "unknown operation {0}.".format(expr[0]))
+Keep in mind that for a variable defined like 'foo = $(fn)', 'fn' will be
+called only when 'foo' is expanded. If 'fn' uses the parsing location and the
+intent is to use the location of the assignment, you want 'foo := $(fn)'
+instead, which calls the function immediately.
- def _eval_min(self, e1, e2):
- """Returns the minimum value of the two expressions. Equates None with
- 'y'."""
- e1_eval = self._eval_expr(e1)
- e2_eval = self._eval_expr(e2)
- return e1_eval if tri_less(e1_eval, e2_eval) else e2_eval
+Once defined, user functions can be called from Kconfig in the same way as
+other preprocessor functions:
- def _eval_max(self, e1, e2):
- """Returns the maximum value of the two expressions. Equates None with
- 'y'."""
- e1_eval = self._eval_expr(e1)
- e2_eval = self._eval_expr(e2)
- return e1_eval if tri_greater(e1_eval, e2_eval) else e2_eval
+ config FOO
+ ...
+ depends on $(my-fn,arg1,arg2)
- #
- # Dependency tracking (for caching and invalidation)
- #
+If my_fn() returns "n", this will result in
- def _build_dep(self):
- """Populates the Symbol.dep sets, linking the symbol to the symbols
- that immediately depend on it in the sense that changing the value of
- the symbol might affect the values of those other symbols. This is used
- for caching/invalidation purposes. The calculated sets might be larger
- than necessary as we don't do any complicated analysis of the
- expressions."""
-
- # Adds 'sym' as a directly dependent symbol to all symbols that appear
- # in the expression 'e'
- def add_expr_deps(e, sym):
- for s in _get_expr_syms(e):
- s.dep.add(sym)
-
- # The directly dependent symbols of a symbol are:
- # - Any symbols whose prompts, default values, rev_dep (select
- # condition), weak_rev_dep (imply condition) or ranges depend on the
- # symbol
- # - Any symbols that belong to the same choice statement as the symbol
- # (these won't be included in 'dep' as that makes the dependency
- # graph unwieldy, but Symbol._get_dependent() will include them)
- # - Any symbols in a choice statement that depends on the symbol
- for sym in self.syms_iter():
- for _, e in sym.prompts:
- add_expr_deps(e, sym)
-
- for v, e in sym.def_exprs:
- add_expr_deps(v, sym)
- add_expr_deps(e, sym)
-
- add_expr_deps(sym.rev_dep, sym)
- add_expr_deps(sym.weak_rev_dep, sym)
-
- for l, u, e in sym.ranges:
- add_expr_deps(l, sym)
- add_expr_deps(u, sym)
- add_expr_deps(e, sym)
-
- if sym.is_choice_sym:
- choice = sym.parent
- for _, e in choice.prompts:
- add_expr_deps(e, sym)
- for _, e in choice.def_exprs:
- add_expr_deps(e, sym)
-
- def _eq_to_sym(self, eq):
- """_expr_depends_on() helper. For (in)equalities of the form sym = y/m
- or sym != n, returns sym. For other (in)equalities, returns None."""
- relation, left, right = eq
-
- def transform_y_m_n(item):
- if item is self.y: return "y"
- if item is self.m: return "m"
- if item is self.n: return "n"
- return item
-
- left = transform_y_m_n(left)
- right = transform_y_m_n(right)
-
- # Make sure the symbol (if any) appears to the left
- if not isinstance(left, Symbol):
- left, right = right, left
- if not isinstance(left, Symbol):
- return None
- if (relation == EQUAL and (right == "y" or right == "m")) or \
- (relation == UNEQUAL and right == "n"):
- return left
- return None
+ config FOO
+ ...
+ depends on n
- def _expr_depends_on(self, expr, sym):
- """Reimplementation of expr_depends_symbol() from mconf.c. Used to
- determine if a submenu should be implicitly created, which influences
- what items inside choice statements are considered choice items."""
- if expr is None:
- return False
+Warning
+*******
- def rec(expr):
- if isinstance(expr, str):
- return False
- if isinstance(expr, Symbol):
- return expr is sym
-
- if expr[0] in (EQUAL, UNEQUAL):
- return self._eq_to_sym(expr) is sym
- if expr[0] == AND:
- for and_expr in expr[1]:
- if rec(and_expr):
- return True
- return False
+User-defined preprocessor functions are called as they're encountered at parse
+time, before all Kconfig files have been processed, and before the menu tree
+has been finalized. There are no guarantees that accessing Kconfig symbols or
+the menu tree via the 'kconf' parameter will work, and it could potentially
+lead to a crash.
- return rec(expr)
+Preferably, user-defined functions should be stateless.
- def _invalidate_all(self):
- for sym in self.syms_iter():
- sym._invalidate()
- #
- # Printing and misc.
- #
+Feedback
+========
- def _expand_sym_refs(self, s):
- """Expands $-references to symbols in 's' to symbol values, or to the
- empty string for undefined symbols."""
+Send bug reports, suggestions, and questions to ulfalizer a.t Google's email
+service, or open a ticket on the GitHub page.
+"""
+import errno
+import importlib
+import os
+import re
+import sys
- while 1:
- sym_ref_match = _sym_ref_re_search(s)
- if sym_ref_match is None:
- return s
+# Get rid of some attribute lookups. These are obvious in context.
+from glob import iglob
+from os.path import dirname, exists, expandvars, islink, join, realpath
- sym_name = sym_ref_match.group(0)[1:]
- sym = self.syms.get(sym_name)
- expansion = "" if sym is None else sym.get_value()
- s = s[:sym_ref_match.start()] + \
- expansion + \
- s[sym_ref_match.end():]
+VERSION = (12, 14, 0)
- def _expr_val_str(self, expr, no_value_str="(none)",
- get_val_instead_of_eval=False):
- """Printing helper. Returns a string with 'expr' and its value.
- no_value_str: String to return when 'expr' is missing (None).
+# File layout:
+#
+# Public classes
+# Public functions
+# Internal functions
+# Global constants
- get_val_instead_of_eval: Assume 'expr' is a symbol or string (constant
- symbol) and get its value directly instead of evaluating it to a
- tristate value."""
+# Line length: 79 columns
- if expr is None:
- return no_value_str
- if get_val_instead_of_eval:
- if isinstance(expr, str):
- return _expr_to_str(expr)
- val = expr.get_value()
- else:
- val = self._eval_expr(expr)
+#
+# Public classes
+#
- return "{0} (value: {1})".format(_expr_to_str(expr), _expr_to_str(val))
- def _get_sym_or_choice_str(self, sc):
- """Symbols and choices have many properties in common, so we factor out
- common __str__() stuff here. "sc" is short for "symbol or choice"."""
+class Kconfig(object):
+ """
+ Represents a Kconfig configuration, e.g. for x86 or ARM. This is the set of
+ symbols, choices, and menu nodes appearing in the configuration. Creating
+ any number of Kconfig objects (including for different architectures) is
+ safe. Kconfiglib doesn't keep any global state.
- # As we deal a lot with string representations here, use some
- # convenient shorthand:
- s = _expr_to_str
+ The following attributes are available. They should be treated as
+ read-only, and some are implemented through @property magic.
- #
- # Common symbol/choice properties
- #
+ syms:
+ A dictionary with all symbols in the configuration, indexed by name. Also
+ includes all symbols that are referenced in expressions but never
+ defined, except for constant (quoted) symbols.
- user_val_str = "(no user value)" if sc.user_val is None else \
- s(sc.user_val)
+ Undefined symbols can be recognized by Symbol.nodes being empty -- see
+ the 'Intro to the menu tree' section in the module docstring.
- # Build prompts string
- if not sc.prompts:
- prompts_str = " (no prompts)"
- else:
- prompts_str_rows = []
- for prompt, cond_expr in sc.orig_prompts:
- prompts_str_rows.append(
- ' "{0}"'.format(prompt) if cond_expr is None else
- ' "{0}" if {1}'.format(prompt,
- self._expr_val_str(cond_expr)))
- prompts_str = "\n".join(prompts_str_rows)
-
- # Build locations string
- locations_str = "(no locations)" if not sc.def_locations else \
- " ".join(["{0}:{1}".format(filename, linenr) for
- filename, linenr in sc.def_locations])
-
- # Build additional-dependencies-from-menus-and-ifs string
- additional_deps_str = " " + \
- self._expr_val_str(sc.deps_from_containing,
- "(no additional dependencies)")
+ const_syms:
+ A dictionary like 'syms' for constant (quoted) symbols
- #
- # Symbol-specific stuff
- #
+ named_choices:
+ A dictionary like 'syms' for named choices (choice FOO)
- if isinstance(sc, Symbol):
- # Build ranges string
- if isinstance(sc, Symbol):
- if not sc.ranges:
- ranges_str = " (no ranges)"
- else:
- ranges_str_rows = []
- for l, u, cond_expr in sc.ranges:
- ranges_str_rows.append(
- " [{0}, {1}]".format(s(l), s(u))
- if cond_expr is None else
- " [{0}, {1}] if {2}"
- .format(s(l), s(u), self._expr_val_str(cond_expr)))
- ranges_str = "\n".join(ranges_str_rows)
-
- # Build default values string
- if not sc.def_exprs:
- defaults_str = " (no default values)"
- else:
- defaults_str_rows = []
- for val_expr, cond_expr in sc.orig_def_exprs:
- row_str = " " + self._expr_val_str(val_expr, "(none)",
- sc.type == STRING)
- defaults_str_rows.append(row_str)
- defaults_str_rows.append(" Condition: " +
- self._expr_val_str(cond_expr))
- defaults_str = "\n".join(defaults_str_rows)
-
- # Build selects string
- if not sc.orig_selects:
- selects_str = " (no selects)"
- else:
- selects_str_rows = []
- for target, cond_expr in sc.orig_selects:
- selects_str_rows.append(
- " {0}".format(target.name) if cond_expr is None else
- " {0} if {1}".format(target.name,
- self._expr_val_str(cond_expr)))
- selects_str = "\n".join(selects_str_rows)
-
- # Build implies string
- if not sc.orig_implies:
- implies_str = " (no implies)"
- else:
- implies_str_rows = []
- for target, cond_expr in sc.orig_implies:
- implies_str_rows.append(
- " {0}".format(target.name) if cond_expr is None else
- " {0} if {1}".format(target.name,
- self._expr_val_str(cond_expr)))
- implies_str = "\n".join(implies_str_rows)
-
- res = _lines("Symbol " +
- ("(no name)" if sc.name is None else sc.name),
- "Type : " + TYPENAME[sc.type],
- "Value : " + s(sc.get_value()),
- "User value : " + user_val_str,
- "Visibility : " + s(_get_visibility(sc)),
- "Is choice item : " + BOOL_STR[sc.is_choice_sym],
- "Is defined : " + BOOL_STR[sc.is_defined_],
- "Is from env. : " + BOOL_STR[sc.is_from_env],
- "Is special : " + BOOL_STR[sc.is_special_] + "\n")
- if sc.ranges:
- res += _lines("Ranges:", ranges_str + "\n")
- res += _lines("Prompts:",
- prompts_str,
- "Default values:",
- defaults_str,
- "Selects:",
- selects_str,
- "Implies:",
- implies_str,
- "Reverse (select-related) dependencies:",
- " (no reverse dependencies)"
- if sc.rev_dep == "n"
- else " " + self._expr_val_str(sc.rev_dep),
- "Weak reverse (imply-related) dependencies:",
- " (no weak reverse dependencies)"
- if sc.weak_rev_dep == "n"
- else " " + self._expr_val_str(sc.weak_rev_dep),
- "Additional dependencies from enclosing menus "
- "and ifs:",
- additional_deps_str,
- "Locations: " + locations_str)
+ defined_syms:
+ A list with all defined symbols, in the same order as they appear in the
+ Kconfig files. Symbols defined in multiple locations appear multiple
+ times.
- return res
+ Note: You probably want to use 'unique_defined_syms' instead. This
+ attribute is mostly maintained for backwards compatibility.
- #
- # Choice-specific stuff
- #
+ unique_defined_syms:
+ A list like 'defined_syms', but with duplicates removed. Just the first
+ instance is kept for symbols defined in multiple locations. Kconfig order
+ is preserved otherwise.
- # Build selected symbol string
- sel = sc.get_selection()
- sel_str = "(no selection)" if sel is None else sel.name
+ Using this attribute instead of 'defined_syms' can save work, and
+ automatically gives reasonable behavior when writing configuration output
+ (symbols defined in multiple locations only generate output once, while
+ still preserving Kconfig order for readability).
- # Build default values string
- if not sc.def_exprs:
- defaults_str = " (no default values)"
- else:
- defaults_str_rows = []
- for sym, cond_expr in sc.orig_def_exprs:
- defaults_str_rows.append(
- " {0}".format(sym.name) if cond_expr is None else
- " {0} if {1}".format(sym.name,
- self._expr_val_str(cond_expr)))
- defaults_str = "\n".join(defaults_str_rows)
-
- # Build contained symbols string
- names = [sym.name for sym in sc.actual_symbols]
- syms_string = " ".join(names) if names else "(empty)"
-
- return _lines("Choice",
- "Name (for named choices): " +
- ("(no name)" if sc.name is None else sc.name),
- "Type : " + TYPENAME[sc.type],
- "Selected symbol : " + sel_str,
- "User value : " + user_val_str,
- "Mode : " + s(sc.get_mode()),
- "Visibility : " + s(_get_visibility(sc)),
- "Optional : " + BOOL_STR[sc.optional],
- "Prompts:",
- prompts_str,
- "Defaults:",
- defaults_str,
- "Choice symbols:",
- " " + syms_string,
- "Additional dependencies from enclosing menus and "
- "ifs:",
- additional_deps_str,
- "Locations: " + locations_str)
+ choices:
+ A list with all choices, in the same order as they appear in the Kconfig
+ files.
- def _warn(self, msg, filename=None, linenr=None):
- """For printing warnings to stderr."""
- msg = _build_msg("warning: " + msg, filename, linenr)
- if self.print_warnings:
- sys.stderr.write(msg + "\n")
- self._warnings.append(msg)
+ Note: You probably want to use 'unique_choices' instead. This attribute
+ is mostly maintained for backwards compatibility.
-class Item(object):
+ unique_choices:
+ Analogous to 'unique_defined_syms', for choices. Named choices can have
+ multiple definition locations.
- """Base class for symbols and other Kconfig constructs. Subclasses are
- Symbol, Choice, Menu, and Comment."""
+ menus:
+ A list with all menus, in the same order as they appear in the Kconfig
+ files
- def is_symbol(self):
- """Returns True if the item is a symbol. Short for
- isinstance(item, kconfiglib.Symbol)."""
- return isinstance(self, Symbol)
+ comments:
+ A list with all comments, in the same order as they appear in the Kconfig
+ files
- def is_choice(self):
- """Returns True if the item is a choice. Short for
- isinstance(item, kconfiglib.Choice)."""
- return isinstance(self, Choice)
+ kconfig_filenames:
+ A list with the filenames of all Kconfig files included in the
+ configuration, relative to $srctree (or relative to the current directory
+ if $srctree isn't set), except absolute paths (e.g.
+ 'source "/foo/Kconfig"') are kept as-is.
- def is_menu(self):
- """Returns True if the item is a menu. Short for
- isinstance(item, kconfiglib.Menu)."""
- return isinstance(self, Menu)
+ The files are listed in the order they are source'd, starting with the
+ top-level Kconfig file. If a file is source'd multiple times, it will
+ appear multiple times. Use set() to get unique filenames.
- def is_comment(self):
- """Returns True if the item is a comment. Short for
- isinstance(item, kconfiglib.Comment)."""
- return isinstance(self, Comment)
+ Note that Kconfig.sync_deps() already indirectly catches any file
+ modifications that change configuration output.
-class Symbol(Item):
+ env_vars:
+ A set() with the names of all environment variables referenced in the
+ Kconfig files.
- """Represents a configuration symbol - e.g. FOO for
+ Only environment variables referenced with the preprocessor $(FOO) syntax
+ will be registered. The older $FOO syntax is only supported for backwards
+ compatibility.
- config FOO
- ..."""
+ Also note that $(FOO) won't be registered unless the environment variable
+ $FOO is actually set. If it isn't, $(FOO) is an expansion of an unset
+ preprocessor variable (which gives the empty string).
- #
- # Public interface
- #
+ Another gotcha is that environment variables referenced in the values of
+ recursively expanded preprocessor variables (those defined with =) will
+ only be registered if the variable is actually used (expanded) somewhere.
- def get_config(self):
- """Returns the Config instance this symbol is from."""
- return self.config
-
- def get_name(self):
- """Returns the name of the symbol."""
- return self.name
-
- def get_type(self):
- """Returns the type of the symbol: one of UNKNOWN, BOOL, TRISTATE,
- STRING, HEX, or INT. These are defined at the top level of the module,
- so you'd do something like
-
- if sym.get_type() == kconfiglib.STRING:
- ..."""
- return self.type
-
- def get_prompts(self):
- """Returns a list of prompts defined for the symbol, in the order they
- appear in the configuration files. Returns the empty list for symbols
- with no prompt.
-
- This list will have a single entry for the vast majority of symbols
- having prompts, but having multiple prompts for a single symbol is
- possible through having multiple 'config' entries for it."""
- return [prompt for prompt, _ in self.orig_prompts]
-
- def get_help(self):
- """Returns the help text of the symbol, or None if the symbol has no
- help text."""
- return self.help
-
- def get_parent(self):
- """Returns the menu or choice statement that contains the symbol, or
- None if the symbol is at the top level. Note that if statements are
- treated as syntactic and do not have an explicit class
- representation."""
- return self.parent
-
- def get_def_locations(self):
- """Returns a list of (filename, linenr) tuples, where filename (string)
- and linenr (int) represent a location where the symbol is defined. For
- the vast majority of symbols this list will only contain one element.
- For the following Kconfig, FOO would get two entries: the lines marked
- with *.
-
- config FOO *
- bool "foo prompt 1"
-
- config FOO *
- bool "foo prompt 2"
- """
- return self.def_locations
-
- def get_ref_locations(self):
- """Returns a list of (filename, linenr) tuples, where filename (string)
- and linenr (int) represent a location where the symbol is referenced in
- the configuration. For example, the lines marked by * would be included
- for FOO below:
+ The note from the 'kconfig_filenames' documentation applies here too.
- config A
- bool
- default BAR || FOO *
+ n/m/y:
+ The predefined constant symbols n/m/y. Also available in const_syms.
- config B
- tristate
- depends on FOO *
- default m if FOO *
+ modules:
+ The Symbol instance for the modules symbol. Currently hardcoded to
+ MODULES, which is backwards compatible. Kconfiglib will warn if
+ 'option modules' is set on some other symbol. Tell me if you need proper
+ 'option modules' support.
+
+ 'modules' is never None. If the MODULES symbol is not explicitly defined,
+ its tri_value will be 0 (n), as expected.
+
+ A simple way to enable modules is to do 'kconf.modules.set_value(2)'
+ (provided the MODULES symbol is defined and visible). Modules are
+ disabled by default in the kernel Kconfig files as of writing, though
+ nearly all defconfig files enable them (with 'CONFIG_MODULES=y').
+
+ defconfig_list:
+ The Symbol instance for the 'option defconfig_list' symbol, or None if no
+ defconfig_list symbol exists. The defconfig filename derived from this
+ symbol can be found in Kconfig.defconfig_filename.
+
+ defconfig_filename:
+ The filename given by the defconfig_list symbol. This is taken from the
+ first 'default' with a satisfied condition where the specified file
+ exists (can be opened for reading). If a defconfig file foo/defconfig is
+ not found and $srctree was set when the Kconfig was created,
+ $srctree/foo/defconfig is looked up as well.
+
+ 'defconfig_filename' is None if either no defconfig_list symbol exists,
+ or if the defconfig_list symbol has no 'default' with a satisfied
+ condition that specifies a file that exists.
+
+ Gotcha: scripts/kconfig/Makefile might pass --defconfig=<defconfig> to
+ scripts/kconfig/conf when running e.g. 'make defconfig'. This option
+ overrides the defconfig_list symbol, meaning defconfig_filename might not
+ always match what 'make defconfig' would use.
+
+ top_node:
+ The menu node (see the MenuNode class) of the implicit top-level menu.
+ Acts as the root of the menu tree.
+
+ mainmenu_text:
+ The prompt (title) of the top menu (top_node). Defaults to "Main menu".
+ Can be changed with the 'mainmenu' statement (see kconfig-language.txt).
+
+ variables:
+ A dictionary with all preprocessor variables, indexed by name. See the
+ Variable class.
+
+ warn:
+ Set this variable to True/False to enable/disable warnings. See
+ Kconfig.__init__().
+
+ When 'warn' is False, the values of the other warning-related variables
+ are ignored.
+
+ This variable as well as the other warn* variables can be read to check
+ the current warning settings.
+
+ warn_to_stderr:
+ Set this variable to True/False to enable/disable warnings on stderr. See
+ Kconfig.__init__().
+
+ warn_assign_undef:
+ Set this variable to True to generate warnings for assignments to
+ undefined symbols in configuration files.
+
+ This variable is False by default unless the KCONFIG_WARN_UNDEF_ASSIGN
+ environment variable was set to 'y' when the Kconfig instance was
+ created.
+
+ warn_assign_override:
+ Set this variable to True to generate warnings for multiple assignments
+ to the same symbol in configuration files, where the assignments set
+ different values (e.g. CONFIG_FOO=m followed by CONFIG_FOO=y, where the
+ last value would get used).
+
+ This variable is True by default. Disabling it might be useful when
+ merging configurations.
+
+ warn_assign_redun:
+ Like warn_assign_override, but for multiple assignments setting a symbol
+ to the same value.
+
+ This variable is True by default. Disabling it might be useful when
+ merging configurations.
+
+ warnings:
+ A list of strings containing all warnings that have been generated, for
+ cases where more flexibility is needed.
+
+ See the 'warn_to_stderr' parameter to Kconfig.__init__() and the
+ Kconfig.warn_to_stderr variable as well. Note that warnings still get
+ added to Kconfig.warnings when 'warn_to_stderr' is True.
+
+ Just as for warnings printed to stderr, only warnings that are enabled
+ will get added to Kconfig.warnings. See the various Kconfig.warn*
+ variables.
+
+ missing_syms:
+ A list with (name, value) tuples for all assignments to undefined symbols
+ within the most recently loaded .config file(s). 'name' is the symbol
+ name without the 'CONFIG_' prefix. 'value' is a string that gives the
+ right-hand side of the assignment verbatim.
+
+ See Kconfig.load_config() as well.
+
+ srctree:
+ The value of the $srctree environment variable when the configuration was
+ loaded, or the empty string if $srctree wasn't set. This gives nice
+ behavior with os.path.join(), which treats "" as the current directory,
+ without adding "./".
+
+ Kconfig files are looked up relative to $srctree (unless absolute paths
+ are used), and .config files are looked up relative to $srctree if they
+ are not found in the current directory. This is used to support
+ out-of-tree builds. The C tools use this environment variable in the same
+ way.
+
+ Changing $srctree after creating the Kconfig instance has no effect. Only
+ the value when the configuration is loaded matters. This avoids surprises
+ if multiple configurations are loaded with different values for $srctree.
+
+ config_prefix:
+ The value of the $CONFIG_ environment variable when the configuration was
+ loaded. This is the prefix used (and expected) on symbol names in .config
+ files and C headers. Defaults to "CONFIG_". Used in the same way in the C
+ tools.
+
+ Like for srctree, only the value of $CONFIG_ when the configuration is
+ loaded matters.
+
+ filename/linenr:
+ The current parsing location, for use in Python preprocessor functions.
+ See the module docstring.
+ """
+ __slots__ = (
+ "_encoding",
+ "_functions",
+ "_set_match",
+ "_srctree_prefix",
+ "_unset_match",
+ "_warn_assign_no_prompt",
+ "choices",
+ "comments",
+ "config_prefix",
+ "const_syms",
+ "defconfig_list",
+ "defined_syms",
+ "env_vars",
+ "kconfig_filenames",
+ "m",
+ "menus",
+ "missing_syms",
+ "modules",
+ "n",
+ "named_choices",
+ "srctree",
+ "syms",
+ "top_node",
+ "unique_choices",
+ "unique_defined_syms",
+ "variables",
+ "warn",
+ "warn_assign_override",
+ "warn_assign_redun",
+ "warn_assign_undef",
+ "warn_to_stderr",
+ "warnings",
+ "y",
+
+ # Parsing-related
+ "_parsing_kconfigs",
+ "_readline",
+ "filename",
+ "linenr",
+ "_include_path",
+ "_filestack",
+ "_line",
+ "_tokens",
+ "_tokens_i",
+ "_reuse_tokens",
+ )
- if FOO *
- config A
- bool "A"
- endif
+ #
+ # Public interface
+ #
- config FOO (definition not included)
- bool
+ def __init__(self, filename="Kconfig", warn=True, warn_to_stderr=True,
+ encoding="utf-8"):
"""
- return self.ref_locations
-
- def get_value(self):
- """Calculate and return the value of the symbol. See also
- Symbol.set_user_value()."""
-
- if self.cached_val is not None:
- return self.cached_val
+ Creates a new Kconfig object by parsing Kconfig files.
+ Note that Kconfig files are not the same as .config files (which store
+ configuration symbol values).
+
+ See the module docstring for some environment variables that influence
+ default warning settings (KCONFIG_WARN_UNDEF and
+ KCONFIG_WARN_UNDEF_ASSIGN).
+
+ Raises KconfigError on syntax/semantic errors, and OSError or (possibly
+ a subclass of) IOError on IO errors ('errno', 'strerror', and
+ 'filename' are available). Note that IOError is an alias for OSError on
+ Python 3, so it's enough to catch OSError there. If you need Python 2/3
+ compatibility, it's easiest to catch EnvironmentError, which is a
+ common base class of OSError/IOError on Python 2 and an alias for
+ OSError on Python 3.
+
+ filename (default: "Kconfig"):
+ The Kconfig file to load. For the Linux kernel, you'll want "Kconfig"
+ from the top-level directory, as environment variables will make sure
+ the right Kconfig is included from there (arch/$SRCARCH/Kconfig as of
+ writing).
+
+ If $srctree is set, 'filename' will be looked up relative to it.
+ $srctree is also used to look up source'd files within Kconfig files.
+ See the class documentation.
+
+ If you are using Kconfiglib via 'make scriptconfig', the filename of
+ the base base Kconfig file will be in sys.argv[1]. It's currently
+ always "Kconfig" in practice.
+
+ warn (default: True):
+ True if warnings related to this configuration should be generated.
+ This can be changed later by setting Kconfig.warn to True/False. It
+ is provided as a constructor argument since warnings might be
+ generated during parsing.
+
+ See the other Kconfig.warn_* variables as well, which enable or
+ suppress certain warnings when warnings are enabled.
+
+ All generated warnings are added to the Kconfig.warnings list. See
+ the class documentation.
+
+ warn_to_stderr (default: True):
+ True if warnings should be printed to stderr in addition to being
+ added to Kconfig.warnings.
+
+ This can be changed later by setting Kconfig.warn_to_stderr to
+ True/False.
+
+ encoding (default: "utf-8"):
+ The encoding to use when reading and writing files, and when decoding
+ output from commands run via $(shell). If None, the encoding
+ specified in the current locale will be used.
+
+ The "utf-8" default avoids exceptions on systems that are configured
+ to use the C locale, which implies an ASCII encoding.
+
+ This parameter has no effect on Python 2, due to implementation
+ issues (regular strings turning into Unicode strings, which are
+ distinct in Python 2). Python 2 doesn't decode regular strings
+ anyway.
+
+ Related PEP: https://www.python.org/dev/peps/pep-0538/
+ """
+ self._encoding = encoding
- # As a quirk of Kconfig, undefined symbols get their name as their
- # value. This is why things like "FOO = bar" work for seeing if FOO has
- # the value "bar".
- if self.type == UNKNOWN:
- self.cached_val = self.name
- return self.name
+ self.srctree = os.getenv("srctree", "")
+ # A prefix we can reliably strip from glob() results to get a filename
+ # relative to $srctree. relpath() can cause issues for symlinks,
+ # because it assumes symlink/../foo is the same as foo/.
+ self._srctree_prefix = realpath(self.srctree) + os.sep
- new_val = DEFAULT_VALUE[self.type]
- vis = _get_visibility(self)
+ self.warn = warn
+ self.warn_to_stderr = warn_to_stderr
+ self.warn_assign_undef = os.getenv("KCONFIG_WARN_UNDEF_ASSIGN") == "y"
+ self.warn_assign_override = True
+ self.warn_assign_redun = True
+ self._warn_assign_no_prompt = True
- # This is easiest to calculate together with the value
- self.write_to_conf = False
+ self.warnings = []
- if self.type == BOOL or self.type == TRISTATE:
- # The visibility and mode (modules-only or single-selection) of
- # choice items will be taken into account in _get_visibility()
- if self.is_choice_sym:
- if vis != "n":
- choice = self.parent
- mode = choice.get_mode()
+ self.config_prefix = os.getenv("CONFIG_", "CONFIG_")
+ # Regular expressions for parsing .config files
+ self._set_match = _re_match(self.config_prefix + r"([^=]+)=(.*)")
+ self._unset_match = _re_match(r"# {}([^ ]+) is not set".format(
+ self.config_prefix))
- self.write_to_conf = (mode != "n")
+ self.syms = {}
+ self.const_syms = {}
+ self.defined_syms = []
+ self.missing_syms = []
+ self.named_choices = {}
+ self.choices = []
+ self.menus = []
+ self.comments = []
- if mode == "y":
- new_val = "y" if choice.get_selection() is self \
- else "n"
- elif mode == "m":
- if self.user_val == "m" or self.user_val == "y":
- new_val = "m"
+ for nmy in "n", "m", "y":
+ sym = Symbol()
+ sym.kconfig = self
+ sym.name = nmy
+ sym.is_constant = True
+ sym.orig_type = TRISTATE
+ sym._cached_tri_val = STR_TO_TRI[nmy]
+
+ self.const_syms[nmy] = sym
+
+ self.n = self.const_syms["n"]
+ self.m = self.const_syms["m"]
+ self.y = self.const_syms["y"]
+
+ # Make n/m/y well-formed symbols
+ for nmy in "n", "m", "y":
+ sym = self.const_syms[nmy]
+ sym.rev_dep = sym.weak_rev_dep = sym.direct_dep = self.n
+
+ # Maps preprocessor variables names to Variable instances
+ self.variables = {}
+
+ # Predefined preprocessor functions, with min/max number of arguments
+ self._functions = {
+ "info": (_info_fn, 1, 1),
+ "error-if": (_error_if_fn, 2, 2),
+ "filename": (_filename_fn, 0, 0),
+ "lineno": (_lineno_fn, 0, 0),
+ "shell": (_shell_fn, 1, 1),
+ "warning-if": (_warning_if_fn, 2, 2),
+ }
+
+ # Add any user-defined preprocessor functions
+ try:
+ self._functions.update(
+ importlib.import_module(
+ os.getenv("KCONFIG_FUNCTIONS", "kconfigfunctions")
+ ).functions)
+ except ImportError:
+ pass
+
+ # This determines whether previously unseen symbols are registered.
+ # They shouldn't be if we parse expressions after parsing, as part of
+ # Kconfig.eval_string().
+ self._parsing_kconfigs = True
+
+ self.modules = self._lookup_sym("MODULES")
+ self.defconfig_list = None
+
+ self.top_node = MenuNode()
+ self.top_node.kconfig = self
+ self.top_node.item = MENU
+ self.top_node.is_menuconfig = True
+ self.top_node.visibility = self.y
+ self.top_node.prompt = ("Main menu", self.y)
+ self.top_node.parent = None
+ self.top_node.dep = self.y
+ self.top_node.filename = filename
+ self.top_node.linenr = 1
+ self.top_node.include_path = ()
- else:
- # If the symbol is visible and has a user value, use that.
- # Otherwise, look at defaults and weak reverse dependencies
- # (implies).
- use_defaults_and_weak_rev_deps = True
-
- if vis != "n":
- self.write_to_conf = True
- if self.user_val is not None:
- new_val = self.config._eval_min(self.user_val, vis)
- use_defaults_and_weak_rev_deps = False
-
- if use_defaults_and_weak_rev_deps:
- for val_expr, cond_expr in self.def_exprs:
- cond_eval = self.config._eval_expr(cond_expr)
- if cond_eval != "n":
- self.write_to_conf = True
- new_val = self.config._eval_min(val_expr,
- cond_eval)
- break
-
- weak_rev_dep_val = \
- self.config._eval_expr(self.weak_rev_dep)
- if weak_rev_dep_val != "n":
- self.write_to_conf = True
- new_val = self.config._eval_max(new_val,
- weak_rev_dep_val)
-
- # Reverse (select-related) dependencies take precedence
- rev_dep_val = self.config._eval_expr(self.rev_dep)
- if rev_dep_val != "n":
- self.write_to_conf = True
- new_val = self.config._eval_max(new_val, rev_dep_val)
-
- # We need to promote "m" to "y" in two circumstances:
- # 1) If our type is boolean
- # 2) If our weak_rev_dep (from IMPLY) is "y"
- if new_val == "m" and \
- (self.type == BOOL or
- self.config._eval_expr(self.weak_rev_dep) == "y"):
- new_val = "y"
-
- elif self.type == INT or self.type == HEX:
- has_active_range = False
- low = None
- high = None
- use_defaults = True
+ # Parse the Kconfig files
- base = 16 if self.type == HEX else 10
+ # Not used internally. Provided as a convenience.
+ self.kconfig_filenames = [filename]
+ self.env_vars = set()
- for l, h, cond_expr in self.ranges:
- if self.config._eval_expr(cond_expr) != "n":
- has_active_range = True
+ # Keeps track of the location in the parent Kconfig files. Kconfig
+ # files usually source other Kconfig files. See _enter_file().
+ self._filestack = []
+ self._include_path = ()
- low_str = _str_val(l)
- high_str = _str_val(h)
- low = int(low_str, base) if \
- _is_base_n(low_str, base) else 0
- high = int(high_str, base) if \
- _is_base_n(high_str, base) else 0
+ # The current parsing location
+ self.filename = filename
+ self.linenr = 0
- break
+ # Used to avoid retokenizing lines when we discover that they're not
+ # part of the construct currently being parsed. This is kinda like an
+ # unget operation.
+ self._reuse_tokens = False
- if vis != "n":
- self.write_to_conf = True
+ # Open the top-level Kconfig file. Store the readline() method directly
+ # as a small optimization.
+ self._readline = self._open(join(self.srctree, filename), "r").readline
- if self.user_val is not None and \
- _is_base_n(self.user_val, base) and \
- (not has_active_range or
- low <= int(self.user_val, base) <= high):
+ try:
+ # Parse the Kconfig files
+ self._parse_block(None, self.top_node, self.top_node)
+ self.top_node.list = self.top_node.next
+ self.top_node.next = None
+ except UnicodeDecodeError as e:
+ _decoding_error(e, self.filename)
- # If the user value is OK, it is stored in exactly the same
- # form as specified in the assignment (with or without
- # "0x", etc).
+ # Close the top-level Kconfig file. __self__ fetches the 'file' object
+ # for the method.
+ self._readline.__self__.close()
- use_defaults = False
- new_val = self.user_val
+ self._parsing_kconfigs = False
- if use_defaults:
- for val_expr, cond_expr in self.def_exprs:
- if self.config._eval_expr(cond_expr) != "n":
- self.write_to_conf = True
-
- # If the default value is OK, it is stored in exactly
- # the same form as specified. Otherwise, it is clamped
- # to the range, and the output has "0x" as appropriate
- # for the type.
-
- new_val = _str_val(val_expr)
-
- if _is_base_n(new_val, base):
- new_val_num = int(new_val, base)
- if has_active_range:
- clamped_val = None
-
- if new_val_num < low:
- clamped_val = low
- elif new_val_num > high:
- clamped_val = high
-
- if clamped_val is not None:
- new_val = (hex(clamped_val) if \
- self.type == HEX else str(clamped_val))
-
- break
- else: # For the for loop
- # If no user value or default kicks in but the hex/int has
- # an active range, then the low end of the range is used,
- # provided it's > 0, with "0x" prepended as appropriate.
- if has_active_range and low > 0:
- new_val = (hex(low) if self.type == HEX else str(low))
-
- elif self.type == STRING:
- use_defaults = True
+ # Do various menu tree post-processing
+ self._finalize_node(self.top_node, self.y)
- if vis != "n":
- self.write_to_conf = True
- if self.user_val is not None:
- new_val = self.user_val
- use_defaults = False
+ self.unique_defined_syms = _ordered_unique(self.defined_syms)
+ self.unique_choices = _ordered_unique(self.choices)
- if use_defaults:
- for val_expr, cond_expr in self.def_exprs:
- if self.config._eval_expr(cond_expr) != "n":
- self.write_to_conf = True
- new_val = _str_val(val_expr)
- break
+ # Do sanity checks. Some of these depend on everything being finalized.
+ self._check_sym_sanity()
+ self._check_choice_sanity()
- self.cached_val = new_val
- return new_val
+ # KCONFIG_STRICT is an older alias for KCONFIG_WARN_UNDEF, supported
+ # for backwards compatibility
+ if os.getenv("KCONFIG_WARN_UNDEF") == "y" or \
+ os.getenv("KCONFIG_STRICT") == "y":
- def get_user_value(self):
- """Returns the value assigned to the symbol in a .config or via
- Symbol.set_user_value() (provided the value was valid for the type of
- the symbol). Returns None in case of no user value."""
- return self.user_val
+ self._check_undef_syms()
- def get_upper_bound(self):
- """For string/hex/int symbols and for bool and tristate symbols that
- cannot be modified (see is_modifiable()), returns None.
+ # Build Symbol._dependents for all symbols and choices
+ self._build_dep()
- Otherwise, returns the highest value the symbol can be set to with
- Symbol.set_user_value() (that will not be truncated): one of "m" or
- "y", arranged from lowest to highest. This corresponds to the highest
- value the symbol could be given in e.g. the 'make menuconfig'
- interface.
+ # Check for dependency loops
+ check_dep_loop_sym = _check_dep_loop_sym # Micro-optimization
+ for sym in self.unique_defined_syms:
+ check_dep_loop_sym(sym, False)
- See also the tri_less*() and tri_greater*() functions, which could come
- in handy."""
- if self.type != BOOL and self.type != TRISTATE:
- return None
- rev_dep = self.config._eval_expr(self.rev_dep)
- # A bool selected to "m" gets promoted to "y", pinning it
- if rev_dep == "m" and self.type == BOOL:
- return None
- vis = _get_visibility(self)
- if TRI_TO_INT[vis] > TRI_TO_INT[rev_dep]:
- return vis
- return None
+ # Add extra dependencies from choices to choice symbols that get
+ # awkward during dependency loop detection
+ self._add_choice_deps()
- def get_lower_bound(self):
- """For string/hex/int symbols and for bool and tristate symbols that
- cannot be modified (see is_modifiable()), returns None.
+ @property
+ def mainmenu_text(self):
+ """
+ See the class documentation.
+ """
+ return self.top_node.prompt[0]
- Otherwise, returns the lowest value the symbol can be set to with
- Symbol.set_user_value() (that will not be truncated): one of "n" or
- "m", arranged from lowest to highest. This corresponds to the lowest
- value the symbol could be given in e.g. the 'make menuconfig'
- interface.
+ @property
+ def defconfig_filename(self):
+ """
+ See the class documentation.
+ """
+ if self.defconfig_list:
+ for filename, cond in self.defconfig_list.defaults:
+ if expr_value(cond):
+ try:
+ with self._open_config(filename.str_value) as f:
+ return f.name
+ except EnvironmentError:
+ continue
- See also the tri_less*() and tri_greater*() functions, which could come
- in handy."""
- if self.type != BOOL and self.type != TRISTATE:
- return None
- rev_dep = self.config._eval_expr(self.rev_dep)
- # A bool selected to "m" gets promoted to "y", pinning it
- if rev_dep == "m" and self.type == BOOL:
- return None
- if TRI_TO_INT[_get_visibility(self)] > TRI_TO_INT[rev_dep]:
- return rev_dep
return None
- def get_assignable_values(self):
- """For string/hex/int symbols and for bool and tristate symbols that
- cannot be modified (see is_modifiable()), returns the empty list.
-
- Otherwise, returns a list containing the user values that can be
- assigned to the symbol (that won't be truncated). Usage example:
-
- if "m" in sym.get_assignable_values():
- sym.set_user_value("m")
-
- This is basically a more convenient interface to
- get_lower/upper_bound() when wanting to test if a particular tristate
- value can be assigned."""
- if self.type != BOOL and self.type != TRISTATE:
- return []
- rev_dep = self.config._eval_expr(self.rev_dep)
- # A bool selected to "m" gets promoted to "y", pinning it
- if rev_dep == "m" and self.type == BOOL:
- return []
- res = ["n", "m", "y"][TRI_TO_INT[rev_dep] :
- TRI_TO_INT[_get_visibility(self)] + 1]
- return res if len(res) > 1 else []
-
- def get_visibility(self):
- """Returns the visibility of the symbol: one of "n", "m" or "y". For
- bool and tristate symbols, this is an upper bound on the value users
- can set for the symbol. For other types of symbols, a visibility of "n"
- means the user value will be ignored. A visibility of "n" corresponds
- to not being visible in the 'make *config' interfaces.
-
- Example (assuming we're running with modules enabled -- i.e., MODULES
- set to 'y'):
-
- # Assume this has been assigned 'n'
- config N_SYM
- tristate "N_SYM"
-
- # Assume this has been assigned 'm'
- config M_SYM
- tristate "M_SYM"
-
- # Has visibility 'n'
- config A
- tristate "A"
- depends on N_SYM
+ def load_config(self, filename=None, replace=True, verbose=None):
+ """
+ Loads symbol values from a file in the .config format. Equivalent to
+ calling Symbol.set_value() to set each of the values.
- # Has visibility 'm'
- config B
- tristate "B"
- depends on M_SYM
+ "# CONFIG_FOO is not set" within a .config file sets the user value of
+ FOO to n. The C tools work the same way.
- # Has visibility 'y'
- config C
- tristate "C"
-
- # Has no prompt, and hence visibility 'n'
- config D
- tristate
-
- Having visibility be tri-valued ensures that e.g. a symbol cannot be
- set to "y" by the user if it depends on a symbol with value "m", which
- wouldn't be safe.
-
- You should probably look at get_lower/upper_bound(),
- get_assignable_values() and is_modifiable() before using this."""
- return _get_visibility(self)
-
- def get_referenced_symbols(self, refs_from_enclosing=False):
- """Returns the set() of all symbols referenced by this symbol. For
- example, the symbol defined by
-
- config FOO
- bool
- prompt "foo" if A && B
- default C if D
- depends on E
- select F if G
-
- references the symbols A through G.
-
- refs_from_enclosing (default: False): If True, the symbols referenced
- by enclosing menus and ifs will be included in the result."""
- return self.all_referenced_syms if refs_from_enclosing else \
- self.referenced_syms
-
- def get_selected_symbols(self):
- """Returns the set() of all symbols X for which this symbol has a
- 'select X' or 'select X if Y' (regardless of whether Y is satisfied or
- not). This is a subset of the symbols returned by
- get_referenced_symbols()."""
- return self.selected_syms
-
- def get_implied_symbols(self):
- """Returns the set() of all symbols X for which this symbol has an
- 'imply X' or 'imply X if Y' (regardless of whether Y is satisfied or
- not). This is a subset of the symbols returned by
- get_referenced_symbols()."""
- return self.implied_syms
-
- def set_user_value(self, v):
- """Sets the user value of the symbol.
+ For each symbol, the Symbol.user_value attribute holds the value the
+ symbol was assigned in the .config file (if any). The user value might
+ differ from Symbol.str/tri_value if there are unsatisfied dependencies.
- Equal in effect to assigning the value to the symbol within a .config
- file. Use get_lower/upper_bound() or get_assignable_values() to find
- the range of currently assignable values for bool and tristate symbols;
- setting values outside this range will cause the user value to differ
- from the result of Symbol.get_value() (be truncated). Values that are
- invalid for the type (such as a_bool.set_user_value("foo")) are
- ignored, and a warning is emitted if an attempt is made to assign such
- a value.
-
- For any type of symbol, is_modifiable() can be used to check if a user
- value will currently have any effect on the symbol, as determined by
- its visibility and range of assignable values. Any value that is valid
- for the type (bool, tristate, etc.) will end up being reflected in
- get_user_value() though, and might have an effect later if conditions
- change. To get rid of the user value, use unset_user_value().
-
- Any symbols dependent on the symbol are (recursively) invalidated, so
- things will just work with regards to dependencies.
-
- v: The user value to give to the symbol."""
- self._set_user_value_no_invalidate(v, False)
-
- # There might be something more efficient you could do here, but play
- # it safe.
- if self.name == "MODULES":
- self.config._invalidate_all()
- return
+ Calling this function also updates the Kconfig.missing_syms attribute
+ with a list of all assignments to undefined symbols within the
+ configuration file. Kconfig.missing_syms is cleared if 'replace' is
+ True, and appended to otherwise. See the documentation for
+ Kconfig.missing_syms as well.
- self._invalidate()
- self._invalidate_dependent()
-
- def unset_user_value(self):
- """Resets the user value of the symbol, as if the symbol had never
- gotten a user value via Config.load_config() or
- Symbol.set_user_value()."""
- self._unset_user_value_no_recursive_invalidate()
- self._invalidate_dependent()
-
- def is_modifiable(self):
- """Returns True if the value of the symbol could be modified by calling
- Symbol.set_user_value().
-
- For bools and tristates, this corresponds to the symbol being visible
- in the 'make menuconfig' interface and not already being pinned to a
- specific value (e.g. because it is selected by another symbol).
-
- For strings and numbers, this corresponds to just being visible. (See
- Symbol.get_visibility().)"""
- if self.is_special_:
- return False
- if self.type == BOOL or self.type == TRISTATE:
- rev_dep = self.config._eval_expr(self.rev_dep)
- # A bool selected to "m" gets promoted to "y", pinning it
- if rev_dep == "m" and self.type == BOOL:
- return False
- return TRI_TO_INT[_get_visibility(self)] > TRI_TO_INT[rev_dep]
- return _get_visibility(self) != "n"
-
- def is_defined(self):
- """Returns False if the symbol is referred to in the Kconfig but never
- actually defined."""
- return self.is_defined_
-
- def is_special(self):
- """Returns True if the symbol is one of the special symbols n, m, y, or
- UNAME_RELEASE, or gets its value from the environment."""
- return self.is_special_
-
- def is_from_environment(self):
- """Returns True if the symbol gets its value from the environment."""
- return self.is_from_env
-
- def has_ranges(self):
- """Returns True if the symbol is of type INT or HEX and has ranges that
- limit what values it can take on."""
- return bool(self.ranges)
-
- def is_choice_symbol(self):
- """Returns True if the symbol is in a choice statement and is an actual
- choice symbol (see Choice.get_symbols())."""
- return self.is_choice_sym
-
- def is_choice_selection(self):
- """Returns True if the symbol is contained in a choice statement and is
- the selected item. Equivalent to
-
- sym.is_choice_symbol() and sym.get_parent().get_selection() is sym"""
- return self.is_choice_sym and self.parent.get_selection() is self
-
- def is_allnoconfig_y(self):
- """Returns True if the symbol has the 'allnoconfig_y' option set."""
- return self.allnoconfig_y
+ See the Kconfig.__init__() docstring for raised exceptions
+ (OSError/IOError). KconfigError is never raised here.
- def __str__(self):
- """Returns a string containing various information about the symbol."""
- return self.config._get_sym_or_choice_str(self)
+ filename (default: None):
+ Path to load configuration from (a string). Respects $srctree if set
+ (see the class documentation).
- #
- # Private methods
- #
+ If 'filename' is None (the default), the configuration file to load
+ (if any) is calculated automatically, giving the behavior you'd
+ usually want:
- def __init__(self):
- """Symbol constructor -- not intended to be called directly by
- Kconfiglib clients."""
-
- self.name = None
- self.type = UNKNOWN
- self.prompts = []
- self.def_exprs = [] # 'default' properties
- self.ranges = [] # 'range' properties (for int and hex)
- self.help = None # Help text
- self.rev_dep = "n" # Reverse (select-related) dependencies
- self.weak_rev_dep = "n" # Weak reverse (imply-related) dependencies
- self.config = None
- self.parent = None
-
- self.user_val = None # Value set by user
-
- # The prompt, default value, select, and imply conditions without any
- # dependencies from menus and ifs propagated to them
- self.orig_prompts = []
- self.orig_def_exprs = []
- self.orig_selects = []
- self.orig_implies = []
-
- # Dependencies inherited from containing menus and ifs
- self.deps_from_containing = None
- # The set of symbols referenced by this symbol (see
- # get_referenced_symbols())
- self.referenced_syms = set()
- # The set of symbols selected by this symbol (see
- # get_selected_symbols())
- self.selected_syms = set()
- # The set of symbols implied by this symbol (see get_implied_symbols())
- self.implied_syms = set()
- # Like 'referenced_syms', but includes symbols from
- # dependencies inherited from enclosing menus and ifs
- self.all_referenced_syms = set()
-
- # This records only dependencies from enclosing ifs and menus together
- # with local 'depends on' dependencies. Needed when determining actual
- # choice items (hrrrr...). See Choice._determine_actual_symbols().
- self.menu_dep = None
-
- # See Symbol.get_ref/def_locations().
- self.def_locations = []
- self.ref_locations = []
-
- # Populated in Config._build_dep() after parsing. Links the symbol to
- # the symbols that immediately depend on it (in a caching/invalidation
- # sense). The total set of dependent symbols for the symbol (the
- # transitive closure) is calculated on an as-needed basis in
- # _get_dependent().
- self.dep = set()
-
- # Cached values
-
- # Caches the calculated value
- self.cached_val = None
- # Caches the visibility, which acts as an upper bound on the value
- self.cached_visibility = None
- # Caches the total list of dependent symbols. Calculated in
- # _get_dependent().
- self.cached_deps = None
-
- # Flags
-
- # Does the symbol have an entry in the Kconfig file? The trailing
- # underscore avoids a collision with is_defined().
- self.is_defined_ = False
- # Should the symbol get an entry in .config?
- self.write_to_conf = False
- # Set to true when _make_conf() is called on a symbol, so that symbols
- # defined in multiple locations only get one .config entry. We need to
- # reset it prior to writing out a new .config.
- self.already_written = False
- # This is set to True for "actual" choice symbols; see
- # Choice._determine_actual_symbols().
- self.is_choice_sym = False
- # Does the symbol get its value in some special way, e.g. from the
- # environment or by being one of the special symbols n, m, and y? If
- # so, the value is stored in self.cached_val, which is never
- # invalidated. The trailing underscore avoids a collision with
- # is_special().
- self.is_special_ = False
- # Does the symbol get its value from the environment?
- self.is_from_env = False
- # Does the symbol have the 'allnoconfig_y' option set?
- self.allnoconfig_y = False
+ 1. If the KCONFIG_CONFIG environment variable is set, it gives the
+ path to the configuration file to load. Otherwise, ".config" is
+ used. See standard_config_filename().
- def _invalidate(self):
- if self.is_special_:
- return
+ 2. If the path from (1.) doesn't exist, the configuration file
+ given by kconf.defconfig_filename is loaded instead, which is
+ derived from the 'option defconfig_list' symbol.
- if self.is_choice_sym:
- self.parent._invalidate()
+ 3. If (1.) and (2.) fail to find a configuration file to load, no
+ configuration file is loaded, and symbols retain their current
+ values (e.g., their default values). This is not an error.
- self.cached_val = None
- self.cached_visibility = None
+ See the return value as well.
- def _invalidate_dependent(self):
- for sym in self._get_dependent():
- sym._invalidate()
+ replace (default: True):
+ If True, all existing user values will be cleared before loading the
+ .config. Pass False to merge configurations.
- def _set_user_value_no_invalidate(self, v, suppress_load_warnings):
- """Like set_user_value(), but does not invalidate any symbols.
+ verbose (default: None):
+ Limited backwards compatibility to prevent crashes. A warning is
+ printed if anything but None is passed.
- suppress_load_warnings: some warnings are annoying when loading a
- .config that can be helpful when manually invoking set_user_value().
- This flag is set to True to suppress such warnings.
+ Prior to Kconfiglib 12.0.0, this option enabled printing of messages
+ to stdout when 'filename' was None. A message is (always) returned
+ now instead, which is more flexible.
- Perhaps this could be made optional for load_config() instead."""
+ Will probably be removed in some future version.
- if self.is_special_:
- if self.is_from_env:
- self.config._warn('attempt to assign the value "{0}" to the '
- 'symbol {1}, which gets its value from the '
- 'environment. Assignment ignored.'
- .format(v, self.name))
- else:
- self.config._warn('attempt to assign the value "{0}" to the '
- 'special symbol {1}. Assignment ignored.'
- .format(v, self.name))
- return
+ Returns a string with a message saying which file got loaded (or
+ possibly that no file got loaded, when 'filename' is None). This is
+ meant to reduce boilerplate in tools, which can do e.g.
+ print(kconf.load_config()). The returned message distinguishes between
+ loading (replace == True) and merging (replace == False).
+ """
+ if verbose is not None:
+ _warn_verbose_deprecated("load_config")
+
+ msg = None
+ if filename is None:
+ filename = standard_config_filename()
+ if not exists(filename) and \
+ not exists(join(self.srctree, filename)):
+ defconfig = self.defconfig_filename
+ if defconfig is None:
+ return "Using default symbol values (no '{}')" \
+ .format(filename)
+
+ msg = " default configuration '{}' (no '{}')" \
+ .format(defconfig, filename)
+ filename = defconfig
+
+ if not msg:
+ msg = " configuration '{}'".format(filename)
+
+ # Disable the warning about assigning to symbols without prompts. This
+ # is normal and expected within a .config file.
+ self._warn_assign_no_prompt = False
+
+ # This stub only exists to make sure _warn_assign_no_prompt gets
+ # reenabled
+ try:
+ self._load_config(filename, replace)
+ except UnicodeDecodeError as e:
+ _decoding_error(e, filename)
+ finally:
+ self._warn_assign_no_prompt = True
+
+ return ("Loaded" if replace else "Merged") + msg
+
+ def _load_config(self, filename, replace):
+ with self._open_config(filename) as f:
+ if replace:
+ self.missing_syms = []
+
+ # If we're replacing the configuration, keep track of which
+ # symbols and choices got set so that we can unset the rest
+ # later. This avoids invalidating everything and is faster.
+ # Another benefit is that invalidation must be rock solid for
+ # it to work, making it a good test.
+
+ for sym in self.unique_defined_syms:
+ sym._was_set = False
+
+ for choice in self.unique_choices:
+ choice._was_set = False
+
+ # Small optimizations
+ set_match = self._set_match
+ unset_match = self._unset_match
+ get_sym = self.syms.get
+
+ for linenr, line in enumerate(f, 1):
+ # The C tools ignore trailing whitespace
+ line = line.rstrip()
+
+ match = set_match(line)
+ if match:
+ name, val = match.groups()
+ sym = get_sym(name)
+ if not sym or not sym.nodes:
+ self._undef_assign(name, val, filename, linenr)
+ continue
+
+ if sym.orig_type in _BOOL_TRISTATE:
+ # The C implementation only checks the first character
+ # to the right of '=', for whatever reason
+ if not (sym.orig_type is BOOL
+ and val.startswith(("y", "n")) or
+ sym.orig_type is TRISTATE
+ and val.startswith(("y", "m", "n"))):
+ self._warn("'{}' is not a valid value for the {} "
+ "symbol {}. Assignment ignored."
+ .format(val, TYPE_TO_STR[sym.orig_type],
+ _name_and_loc(sym)),
+ filename, linenr)
+ continue
+
+ val = val[0]
+
+ if sym.choice and val != "n":
+ # During .config loading, we infer the mode of the
+ # choice from the kind of values that are assigned
+ # to the choice symbols
+
+ prev_mode = sym.choice.user_value
+ if prev_mode is not None and \
+ TRI_TO_STR[prev_mode] != val:
+
+ self._warn("both m and y assigned to symbols "
+ "within the same choice",
+ filename, linenr)
+
+ # Set the choice's mode
+ sym.choice.set_value(val)
+
+ elif sym.orig_type is STRING:
+ match = _conf_string_match(val)
+ if not match:
+ self._warn("malformed string literal in "
+ "assignment to {}. Assignment ignored."
+ .format(_name_and_loc(sym)),
+ filename, linenr)
+ continue
+
+ val = unescape(match.group(1))
- if not self.is_defined_:
- filename, linenr = self.ref_locations[0]
- if self.config.print_undef_assign:
- _stderr_msg('note: attempt to assign the value "{0}" to {1}, '
- "which is referenced at {2}:{3} but never "
- "defined. Assignment ignored."
- .format(v, self.name, filename, linenr))
- return
+ else:
+ match = unset_match(line)
+ if not match:
+ # Print a warning for lines that match neither
+ # set_match() nor unset_match() and that are not blank
+ # lines or comments. 'line' has already been
+ # rstrip()'d, so blank lines show up as "" here.
+ if line and not line.lstrip().startswith("#"):
+ self._warn("ignoring malformed line '{}'"
+ .format(line),
+ filename, linenr)
- # Check if the value is valid for our type
- if not ((self.type == BOOL and (v == "y" or v == "n") ) or
- (self.type == TRISTATE and (v == "y" or v == "m" or
- v == "n") ) or
- (self.type == STRING ) or
- (self.type == INT and _is_base_n(v, 10) ) or
- (self.type == HEX and _is_base_n(v, 16) )):
- self.config._warn('the value "{0}" is invalid for {1}, which has '
- "type {2}. Assignment ignored."
- .format(v, self.name, TYPENAME[self.type]))
- return
+ continue
- if not self.prompts and not suppress_load_warnings:
- self.config._warn('assigning "{0}" to the symbol {1} which '
- 'lacks prompts and thus has visibility "n". '
- 'The assignment will have no effect.'
- .format(v, self.name))
+ name = match.group(1)
+ sym = get_sym(name)
+ if not sym or not sym.nodes:
+ self._undef_assign(name, "n", filename, linenr)
+ continue
- self.user_val = v
+ if sym.orig_type not in _BOOL_TRISTATE:
+ continue
- if self.is_choice_sym and (self.type == BOOL or self.type == TRISTATE):
- choice = self.parent
- if v == "y":
- choice.user_val = self
- choice.user_mode = "y"
- elif v == "m":
- choice.user_val = None
- choice.user_mode = "m"
+ val = "n"
- def _unset_user_value_no_recursive_invalidate(self):
- self._invalidate()
- self.user_val = None
+ # Done parsing the assignment. Set the value.
- if self.is_choice_sym:
- self.parent._unset_user_value()
+ if sym._was_set:
+ self._assigned_twice(sym, val, filename, linenr)
- def _make_conf(self, append_fn):
- if self.already_written:
- return
+ sym.set_value(val)
- self.already_written = True
+ if replace:
+ # If we're replacing the configuration, unset the symbols that
+ # didn't get set
- # Note: write_to_conf is determined in get_value()
- val = self.get_value()
- if not self.write_to_conf:
- return
+ for sym in self.unique_defined_syms:
+ if not sym._was_set:
+ sym.unset_value()
- if self.type == BOOL or self.type == TRISTATE:
- append_fn("{0}{1}={2}".format(self.config.config_prefix, self.name, val)
- if val == "y" or val == "m" else
- "# {0}{1} is not set".format(self.config.config_prefix, self.name))
+ for choice in self.unique_choices:
+ if not choice._was_set:
+ choice.unset_value()
- elif self.type == INT or self.type == HEX:
- append_fn("{0}{1}={2}".format(self.config.config_prefix, self.name, val))
+ def _undef_assign(self, name, val, filename, linenr):
+ # Called for assignments to undefined symbols during .config loading
- elif self.type == STRING:
- # Escape \ and "
- append_fn('{0}{1}="{2}"'
- .format(self.config.config_prefix, self.name,
- val.replace("\\", "\\\\").replace('"', '\\"')))
+ self.missing_syms.append((name, val))
+ if self.warn_assign_undef:
+ self._warn(
+ "attempt to assign the value '{}' to the undefined symbol {}"
+ .format(val, name), filename, linenr)
+ def _assigned_twice(self, sym, new_val, filename, linenr):
+ # Called when a symbol is assigned more than once in a .config file
+
+ # Use strings for bool/tristate user values in the warning
+ if sym.orig_type in _BOOL_TRISTATE:
+ user_val = TRI_TO_STR[sym.user_value]
else:
- _internal_error("Internal error while creating .config: unknown "
- 'type "{0}".'.format(self.type))
-
- def _get_dependent(self):
- """Returns the set of symbols that should be invalidated if the value
- of the symbol changes, because they might be affected by the change.
- Note that this is an internal API -- it's probably of limited
- usefulness to clients."""
- if self.cached_deps is not None:
- return self.cached_deps
-
- res = set(self.dep)
- for s in self.dep:
- res |= s._get_dependent()
-
- if self.is_choice_sym:
- # Choice symbols also depend (recursively) on their siblings. The
- # siblings are not included in 'dep' to avoid dependency loops.
- for sibling in self.parent.actual_symbols:
- if sibling is not self:
- res.add(sibling)
- res |= sibling.dep
- for s in sibling.dep:
- res |= s._get_dependent()
-
- self.cached_deps = res
- return res
+ user_val = sym.user_value
+
+ msg = '{} set more than once. Old value "{}", new value "{}".'.format(
+ _name_and_loc(sym), user_val, new_val)
+
+ if user_val == new_val:
+ if self.warn_assign_redun:
+ self._warn(msg, filename, linenr)
+ elif self.warn_assign_override:
+ self._warn(msg, filename, linenr)
+
+ def write_autoconf(self, filename,
+ header="/* Generated by Kconfiglib (https://github.com/ulfalizer/Kconfiglib) */\n"):
+ r"""
+ Writes out symbol values as a C header file, matching the format used
+ by include/generated/autoconf.h in the kernel.
+
+ The ordering of the #defines matches the one generated by
+ write_config(). The order in the C implementation depends on the hash
+ table implementation as of writing, and so won't match.
+
+ If 'filename' exists and its contents is identical to what would get
+ written out, it is left untouched. This avoids updating file metadata
+ like the modification time and possibly triggering redundant work in
+ build tools.
+
+ filename:
+ Self-explanatory.
+
+ header (default: "/* Generated by Kconfiglib (https://github.com/ulfalizer/Kconfiglib) */\n"):
+ Text that will be inserted verbatim at the beginning of the file. You
+ would usually want it enclosed in '/* */' to make it a C comment,
+ and include a final terminating newline.
+ """
+ self._write_if_changed(filename, self._autoconf_contents(header))
- def _has_auto_menu_dep_on(self, on):
- """See Choice._determine_actual_symbols()."""
- if not isinstance(self.parent, Choice):
- _internal_error("Attempt to determine auto menu dependency for "
- "symbol ouside of choice.")
+ def _autoconf_contents(self, header):
+ # write_autoconf() helper. Returns the contents to write as a string,
+ # with 'header' at the beginning.
- if not self.prompts:
- # If we have no prompt, use the menu dependencies instead (what was
- # specified with 'depends on')
- return self.menu_dep is not None and \
- self.config._expr_depends_on(self.menu_dep, on)
+ # "".join()ed later
+ chunks = [header]
+ add = chunks.append
- for _, cond_expr in self.prompts:
- if self.config._expr_depends_on(cond_expr, on):
- return True
+ for sym in self.unique_defined_syms:
+ # _write_to_conf is determined when the value is calculated. This
+ # is a hidden function call due to property magic.
+ #
+ # Note: In client code, you can check if sym.config_string is empty
+ # instead, to avoid accessing the internal _write_to_conf variable
+ # (though it's likely to keep working).
+ val = sym.str_value
+ if not sym._write_to_conf:
+ continue
- return False
+ if sym.orig_type in _BOOL_TRISTATE:
+ if val == "y":
+ add("#define {}{} 1\n"
+ .format(self.config_prefix, sym.name))
+ elif val == "m":
+ add("#define {}{}_MODULE 1\n"
+ .format(self.config_prefix, sym.name))
+
+ elif sym.orig_type is STRING:
+ add('#define {}{} "{}"\n'
+ .format(self.config_prefix, sym.name, escape(val)))
+
+ else: # sym.orig_type in _INT_HEX:
+ if sym.orig_type is HEX and \
+ not val.startswith(("0x", "0X")):
+ val = "0x" + val
+
+ add("#define {}{} {}\n"
+ .format(self.config_prefix, sym.name, val))
+
+ return "".join(chunks)
+
+ def write_config(self, filename=None,
+ header="# Generated by Kconfiglib (https://github.com/ulfalizer/Kconfiglib)\n",
+ save_old=True, verbose=None):
+ r"""
+ Writes out symbol values in the .config format. The format matches the
+ C implementation, including ordering.
+
+ Symbols appear in the same order in generated .config files as they do
+ in the Kconfig files. For symbols defined in multiple locations, a
+ single assignment is written out corresponding to the first location
+ where the symbol is defined.
+
+ See the 'Intro to symbol values' section in the module docstring to
+ understand which symbols get written out.
+
+ If 'filename' exists and its contents is identical to what would get
+ written out, it is left untouched. This avoids updating file metadata
+ like the modification time and possibly triggering redundant work in
+ build tools.
+
+ See the Kconfig.__init__() docstring for raised exceptions
+ (OSError/IOError). KconfigError is never raised here.
+
+ filename (default: None):
+ Filename to save configuration to (a string).
+
+ If None (the default), the filename in the environment variable
+ KCONFIG_CONFIG is used if set, and ".config" otherwise. See
+ standard_config_filename().
+
+ header (default: "# Generated by Kconfiglib (https://github.com/ulfalizer/Kconfiglib)\n"):
+ Text that will be inserted verbatim at the beginning of the file. You
+ would usually want each line to start with '#' to make it a comment,
+ and include a final terminating newline.
+
+ save_old (default: True):
+ If True and <filename> already exists, a copy of it will be saved to
+ <filename>.old in the same directory before the new configuration is
+ written.
+
+ Errors are silently ignored if <filename>.old cannot be written (e.g.
+ due to being a directory, or <filename> being something like
+ /dev/null).
+
+ verbose (default: None):
+ Limited backwards compatibility to prevent crashes. A warning is
+ printed if anything but None is passed.
+
+ Prior to Kconfiglib 12.0.0, this option enabled printing of messages
+ to stdout when 'filename' was None. A message is (always) returned
+ now instead, which is more flexible.
+
+ Will probably be removed in some future version.
+
+ Returns a string with a message saying which file got saved. This is
+ meant to reduce boilerplate in tools, which can do e.g.
+ print(kconf.write_config()).
+ """
+ if verbose is not None:
+ _warn_verbose_deprecated("write_config")
-class Menu(Item):
+ if filename is None:
+ filename = standard_config_filename()
- """Represents a menu statement."""
+ contents = self._config_contents(header)
+ if self._contents_eq(filename, contents):
+ return "No change to '{}'".format(filename)
- #
- # Public interface
- #
+ if save_old:
+ _save_old(filename)
- def get_config(self):
- """Return the Config instance this menu is from."""
- return self.config
-
- def get_title(self):
- """Returns the title text of the menu."""
- return self.title
-
- def get_parent(self):
- """Returns the menu or choice statement that contains the menu, or
- None if the menu is at the top level. Note that if statements are
- treated as syntactic sugar and do not have an explicit class
- representation."""
- return self.parent
-
- def get_location(self):
- """Returns the location of the menu as a (filename, linenr) tuple,
- where filename is a string and linenr an int."""
- return (self.filename, self.linenr)
-
- def get_items(self, recursive=False):
- """Returns a list containing the items (symbols, menus, choice
- statements and comments) in in the menu, in the same order that the
- items appear within the menu.
-
- recursive (default: False): True if items contained in items within the
- menu should be included recursively (preorder)."""
-
- if not recursive:
- return self.block
-
- res = []
- for item in self.block:
- res.append(item)
- if isinstance(item, Menu):
- res.extend(item.get_items(True))
- elif isinstance(item, Choice):
- res.extend(item.get_items())
- return res
+ with self._open(filename, "w") as f:
+ f.write(contents)
- def get_symbols(self, recursive=False):
- """Returns a list containing the symbols in the menu, in the same order
- that they appear within the menu.
+ return "Configuration saved to '{}'".format(filename)
- recursive (default: False): True if symbols contained in items within
- the menu should be included recursively."""
+ def _config_contents(self, header):
+ # write_config() helper. Returns the contents to write as a string,
+ # with 'header' at the beginning.
+ #
+ # More memory friendly would be to 'yield' the strings and
+ # "".join(_config_contents()), but it was a bit slower on my system.
- return [item for item in self.get_items(recursive) if
- isinstance(item, Symbol)]
+ # node_iter() was used here before commit 3aea9f7 ("Add '# end of
+ # <menu>' after menus in .config"). Those comments get tricky to
+ # implement with it.
- def get_visibility(self):
- """Returns the visibility of the menu. This also affects the visibility
- of subitems. See also Symbol.get_visibility()."""
- return self.config._eval_expr(self.dep_expr)
+ for sym in self.unique_defined_syms:
+ sym._visited = False
- def get_visible_if_visibility(self):
- """Returns the visibility the menu gets from its 'visible if'
- condition. "y" if the menu has no 'visible if' condition."""
- return self.config._eval_expr(self.visible_if_expr)
+ # Did we just print an '# end of ...' comment?
+ after_end_comment = False
- def get_referenced_symbols(self, refs_from_enclosing=False):
- """See Symbol.get_referenced_symbols()."""
- return self.all_referenced_syms if refs_from_enclosing else \
- self.referenced_syms
+ # "".join()ed later
+ chunks = [header]
+ add = chunks.append
- def __str__(self):
- """Returns a string containing various information about the menu."""
- depends_on_str = self.config._expr_val_str(self.orig_deps,
- "(no dependencies)")
- visible_if_str = self.config._expr_val_str(self.visible_if_expr,
- "(no dependencies)")
-
- additional_deps_str = " " + \
- self.config._expr_val_str(self.deps_from_containing,
- "(no additional dependencies)")
-
- return _lines("Menu",
- "Title : " + self.title,
- "'depends on' dependencies : " + depends_on_str,
- "'visible if' dependencies : " + visible_if_str,
- "Additional dependencies from enclosing menus and "
- "ifs:",
- additional_deps_str,
- "Location: {0}:{1}".format(self.filename, self.linenr))
+ node = self.top_node
+ while 1:
+ # Jump to the next node with an iterative tree walk
+ if node.list:
+ node = node.list
+ elif node.next:
+ node = node.next
+ else:
+ while node.parent:
+ node = node.parent
+
+ # Add a comment when leaving visible menus
+ if node.item is MENU and expr_value(node.dep) and \
+ expr_value(node.visibility) and \
+ node is not self.top_node:
+ add("# end of {}\n".format(node.prompt[0]))
+ after_end_comment = True
+
+ if node.next:
+ node = node.next
+ break
+ else:
+ # No more nodes
+ return "".join(chunks)
- #
- # Private methods
- #
+ # Generate configuration output for the node
- def __init__(self):
- """Menu constructor -- not intended to be called directly by
- Kconfiglib clients."""
-
- self.title = None
- self.dep_expr = None
- self.visible_if_expr = None
- self.block = [] # List of contained items
- self.config = None
- self.parent = None
-
- # Dependency expression without dependencies from enclosing menus and
- # ifs propagated
- self.orig_deps = None
-
- # Dependencies inherited from containing menus and ifs
- self.deps_from_containing = None
- # The set of symbols referenced by this menu (see
- # get_referenced_symbols())
- self.referenced_syms = set()
- # Like 'referenced_syms', but includes symbols from
- # dependencies inherited from enclosing menus and ifs
- self.all_referenced_syms = None
+ item = node.item
- self.filename = None
- self.linenr = None
+ if item.__class__ is Symbol:
+ if item._visited:
+ continue
+ item._visited = True
- def _make_conf(self, append_fn):
- if self.config._eval_expr(self.dep_expr) != "n" and \
- self.config._eval_expr(self.visible_if_expr) != "n":
- append_fn("\n#\n# {0}\n#".format(self.title))
- _make_block_conf(self.block, append_fn)
+ conf_string = item.config_string
+ if not conf_string:
+ continue
-class Choice(Item):
+ if after_end_comment:
+ # Add a blank line before the first symbol printed after an
+ # '# end of ...' comment
+ after_end_comment = False
+ add("\n")
+ add(conf_string)
- """Represents a choice statement. A choice can be in one of three modes:
+ elif expr_value(node.dep) and \
+ ((item is MENU and expr_value(node.visibility)) or
+ item is COMMENT):
- "n" - The choice is not visible and no symbols can be selected.
+ add("\n#\n# {}\n#\n".format(node.prompt[0]))
+ after_end_comment = False
- "m" - Any number of symbols can be set to "m". The rest will be "n". This
- is safe since potentially conflicting options don't actually get
- compiled into the kernel simultaneously with "m".
+ def write_min_config(self, filename,
+ header="# Generated by Kconfiglib (https://github.com/ulfalizer/Kconfiglib)\n"):
+ """
+ Writes out a "minimal" configuration file, omitting symbols whose value
+ matches their default value. The format matches the one produced by
+ 'make savedefconfig'.
+
+ The resulting configuration file is incomplete, but a complete
+ configuration can be derived from it by loading it. Minimal
+ configuration files can serve as a more manageable configuration format
+ compared to a "full" .config file, especially when configurations files
+ are merged or edited by hand.
+
+ See the Kconfig.__init__() docstring for raised exceptions
+ (OSError/IOError). KconfigError is never raised here.
+
+ filename:
+ Self-explanatory.
+
+ header (default: "# Generated by Kconfiglib (https://github.com/ulfalizer/Kconfiglib)\n"):
+ Text that will be inserted verbatim at the beginning of the file. You
+ would usually want each line to start with '#' to make it a comment,
+ and include a final terminating newline.
+
+ Returns a string with a message saying which file got saved. This is
+ meant to reduce boilerplate in tools, which can do e.g.
+ print(kconf.write_min_config()).
+ """
+ contents = self._min_config_contents(header)
+ if self._contents_eq(filename, contents):
+ return "No change to '{}'".format(filename)
+
+ with self._open(filename, "w") as f:
+ f.write(contents)
+
+ return "Minimal configuration saved to '{}'".format(filename)
+
+ def _min_config_contents(self, header):
+ # write_min_config() helper. Returns the contents to write as a string,
+ # with 'header' at the beginning.
+
+ chunks = [header]
+ add = chunks.append
+
+ for sym in self.unique_defined_syms:
+ # Skip symbols that cannot be changed. Only check
+ # non-choice symbols, as selects don't affect choice
+ # symbols.
+ if not sym.choice and \
+ sym.visibility <= expr_value(sym.rev_dep):
+ continue
+
+ # Skip symbols whose value matches their default
+ if sym.str_value == sym._str_default():
+ continue
+
+ # Skip symbols that would be selected by default in a
+ # choice, unless the choice is optional or the symbol type
+ # isn't bool (it might be possible to set the choice mode
+ # to n or the symbol to m in those cases).
+ if sym.choice and \
+ not sym.choice.is_optional and \
+ sym.choice._selection_from_defaults() is sym and \
+ sym.orig_type is BOOL and \
+ sym.tri_value == 2:
+ continue
+
+ add(sym.config_string)
+
+ return "".join(chunks)
+
+ def sync_deps(self, path):
+ """
+ Creates or updates a directory structure that can be used to avoid
+ doing a full rebuild whenever the configuration is changed, mirroring
+ include/config/ in the kernel.
+
+ This function is intended to be called during each build, before
+ compiling source files that depend on configuration symbols.
+
+ See the Kconfig.__init__() docstring for raised exceptions
+ (OSError/IOError). KconfigError is never raised here.
+
+ path:
+ Path to directory
+
+ sync_deps(path) does the following:
+
+ 1. If the directory <path> does not exist, it is created.
+
+ 2. If <path>/auto.conf exists, old symbol values are loaded from it,
+ which are then compared against the current symbol values. If a
+ symbol has changed value (would generate different output in
+ autoconf.h compared to before), the change is signaled by
+ touch'ing a file corresponding to the symbol.
+
+ The first time sync_deps() is run on a directory, <path>/auto.conf
+ won't exist, and no old symbol values will be available. This
+ logically has the same effect as updating the entire
+ configuration.
+
+ The path to a symbol's file is calculated from the symbol's name
+ by replacing all '_' with '/' and appending '.h'. For example, the
+ symbol FOO_BAR_BAZ gets the file <path>/foo/bar/baz.h, and FOO
+ gets the file <path>/foo.h.
+
+ This scheme matches the C tools. The point is to avoid having a
+ single directory with a huge number of files, which the underlying
+ filesystem might not handle well.
+
+ 3. A new auto.conf with the current symbol values is written, to keep
+ track of them for the next build.
+
+ If auto.conf exists and its contents is identical to what would
+ get written out, it is left untouched. This avoids updating file
+ metadata like the modification time and possibly triggering
+ redundant work in build tools.
+
+
+ The last piece of the puzzle is knowing what symbols each source file
+ depends on. Knowing that, dependencies can be added from source files
+ to the files corresponding to the symbols they depends on. The source
+ file will then get recompiled (only) when the symbol value changes
+ (provided sync_deps() is run first during each build).
+
+ The tool in the kernel that extracts symbol dependencies from source
+ files is scripts/basic/fixdep.c. Missing symbol files also correspond
+ to "not changed", which fixdep deals with by using the $(wildcard) Make
+ function when adding symbol prerequisites to source files.
+
+ In case you need a different scheme for your project, the sync_deps()
+ implementation can be used as a template.
+ """
+ if not exists(path):
+ os.mkdir(path, 0o755)
+
+ # Load old values from auto.conf, if any
+ self._load_old_vals(path)
+
+ for sym in self.unique_defined_syms:
+ # _write_to_conf is determined when the value is calculated. This
+ # is a hidden function call due to property magic.
+ #
+ # Note: In client code, you can check if sym.config_string is empty
+ # instead, to avoid accessing the internal _write_to_conf variable
+ # (though it's likely to keep working).
+ val = sym.str_value
+
+ # n tristate values do not get written to auto.conf and autoconf.h,
+ # making a missing symbol logically equivalent to n
+
+ if sym._write_to_conf:
+ if sym._old_val is None and \
+ sym.orig_type in _BOOL_TRISTATE and \
+ val == "n":
+ # No old value (the symbol was missing or n), new value n.
+ # No change.
+ continue
+
+ if val == sym._old_val:
+ # New value matches old. No change.
+ continue
+
+ elif sym._old_val is None:
+ # The symbol wouldn't appear in autoconf.h (because
+ # _write_to_conf is false), and it wouldn't have appeared in
+ # autoconf.h previously either (because it didn't appear in
+ # auto.conf). No change.
+ continue
+
+ # 'sym' has a new value. Flag it.
+ _touch_dep_file(path, sym.name)
+
+ # Remember the current values as the "new old" values.
+ #
+ # This call could go anywhere after the call to _load_old_vals(), but
+ # putting it last means _sync_deps() can be safely rerun if it fails
+ # before this point.
+ self._write_old_vals(path)
+
+ def _load_old_vals(self, path):
+ # Loads old symbol values from auto.conf into a dedicated
+ # Symbol._old_val field. Mirrors load_config().
+ #
+ # The extra field could be avoided with some trickery involving dumping
+ # symbol values and restoring them later, but this is simpler and
+ # faster. The C tools also use a dedicated field for this purpose.
+
+ for sym in self.unique_defined_syms:
+ sym._old_val = None
+
+ try:
+ auto_conf = self._open(join(path, "auto.conf"), "r")
+ except EnvironmentError as e:
+ if e.errno == errno.ENOENT:
+ # No old values
+ return
+ raise
+
+ with auto_conf as f:
+ for line in f:
+ match = self._set_match(line)
+ if not match:
+ # We only expect CONFIG_FOO=... (and possibly a header
+ # comment) in auto.conf
+ continue
+
+ name, val = match.groups()
+ if name in self.syms:
+ sym = self.syms[name]
+
+ if sym.orig_type is STRING:
+ match = _conf_string_match(val)
+ if not match:
+ continue
+ val = unescape(match.group(1))
+
+ self.syms[name]._old_val = val
+ else:
+ # Flag that the symbol no longer exists, in
+ # case something still depends on it
+ _touch_dep_file(path, name)
+
+ def _write_old_vals(self, path):
+ # Helper for writing auto.conf. Basically just a simplified
+ # write_config() that doesn't write any comments (including
+ # '# CONFIG_FOO is not set' comments). The format matches the C
+ # implementation, though the ordering is arbitrary there (depends on
+ # the hash table implementation).
+ #
+ # A separate helper function is neater than complicating write_config()
+ # by passing a flag to it, plus we only need to look at symbols here.
+
+ self._write_if_changed(
+ os.path.join(path, "auto.conf"),
+ self._old_vals_contents())
+
+ def _old_vals_contents(self):
+ # _write_old_vals() helper. Returns the contents to write as a string.
+
+ # Temporary list instead of generator makes this a bit faster
+ return "".join([
+ sym.config_string for sym in self.unique_defined_syms
+ if not (sym.orig_type in _BOOL_TRISTATE and not sym.tri_value)
+ ])
+
+ def node_iter(self, unique_syms=False):
+ """
+ Returns a generator for iterating through all MenuNode's in the Kconfig
+ tree. The iteration is done in Kconfig definition order (each node is
+ visited before its children, and the children of a node are visited
+ before the next node).
+
+ The Kconfig.top_node menu node is skipped. It contains an implicit menu
+ that holds the top-level items.
+
+ As an example, the following code will produce a list equal to
+ Kconfig.defined_syms:
+
+ defined_syms = [node.item for node in kconf.node_iter()
+ if isinstance(node.item, Symbol)]
+
+ unique_syms (default: False):
+ If True, only the first MenuNode will be included for symbols defined
+ in multiple locations.
+
+ Using kconf.node_iter(True) in the example above would give a list
+ equal to unique_defined_syms.
+ """
+ if unique_syms:
+ for sym in self.unique_defined_syms:
+ sym._visited = False
+
+ node = self.top_node
+ while 1:
+ # Jump to the next node with an iterative tree walk
+ if node.list:
+ node = node.list
+ elif node.next:
+ node = node.next
+ else:
+ while node.parent:
+ node = node.parent
+ if node.next:
+ node = node.next
+ break
+ else:
+ # No more nodes
+ return
+
+ if unique_syms and node.item.__class__ is Symbol:
+ if node.item._visited:
+ continue
+ node.item._visited = True
+
+ yield node
+
+ def eval_string(self, s):
+ """
+ Returns the tristate value of the expression 's', represented as 0, 1,
+ and 2 for n, m, and y, respectively. Raises KconfigError on syntax
+ errors. Warns if undefined symbols are referenced.
+
+ As an example, if FOO and BAR are tristate symbols at least one of
+ which has the value y, then eval_string("y && (FOO || BAR)") returns
+ 2 (y).
+
+ To get the string value of non-bool/tristate symbols, use
+ Symbol.str_value. eval_string() always returns a tristate value, and
+ all non-bool/tristate symbols have the tristate value 0 (n).
+
+ The expression parsing is consistent with how parsing works for
+ conditional ('if ...') expressions in the configuration, and matches
+ the C implementation. m is rewritten to 'm && MODULES', so
+ eval_string("m") will return 0 (n) unless modules are enabled.
+ """
+ # The parser is optimized to be fast when parsing Kconfig files (where
+ # an expression can never appear at the beginning of a line). We have
+ # to monkey-patch things a bit here to reuse it.
+
+ self.filename = None
+
+ self._tokens = self._tokenize("if " + s)
+ # Strip "if " to avoid giving confusing error messages
+ self._line = s
+ self._tokens_i = 1 # Skip the 'if' token
+
+ return expr_value(self._expect_expr_and_eol())
+
+ def unset_values(self):
+ """
+ Removes any user values from all symbols, as if Kconfig.load_config()
+ or Symbol.set_value() had never been called.
+ """
+ self._warn_assign_no_prompt = False
+ try:
+ # set_value() already rejects undefined symbols, and they don't
+ # need to be invalidated (because their value never changes), so we
+ # can just iterate over defined symbols
+ for sym in self.unique_defined_syms:
+ sym.unset_value()
+
+ for choice in self.unique_choices:
+ choice.unset_value()
+ finally:
+ self._warn_assign_no_prompt = True
+
+ def enable_warnings(self):
+ """
+ Do 'Kconfig.warn = True' instead. Maintained for backwards
+ compatibility.
+ """
+ self.warn = True
+
+ def disable_warnings(self):
+ """
+ Do 'Kconfig.warn = False' instead. Maintained for backwards
+ compatibility.
+ """
+ self.warn = False
+
+ def enable_stderr_warnings(self):
+ """
+ Do 'Kconfig.warn_to_stderr = True' instead. Maintained for backwards
+ compatibility.
+ """
+ self.warn_to_stderr = True
+
+ def disable_stderr_warnings(self):
+ """
+ Do 'Kconfig.warn_to_stderr = False' instead. Maintained for backwards
+ compatibility.
+ """
+ self.warn_to_stderr = False
+
+ def enable_undef_warnings(self):
+ """
+ Do 'Kconfig.warn_assign_undef = True' instead. Maintained for backwards
+ compatibility.
+ """
+ self.warn_assign_undef = True
+
+ def disable_undef_warnings(self):
+ """
+ Do 'Kconfig.warn_assign_undef = False' instead. Maintained for
+ backwards compatibility.
+ """
+ self.warn_assign_undef = False
+
+ def enable_override_warnings(self):
+ """
+ Do 'Kconfig.warn_assign_override = True' instead. Maintained for
+ backwards compatibility.
+ """
+ self.warn_assign_override = True
+
+ def disable_override_warnings(self):
+ """
+ Do 'Kconfig.warn_assign_override = False' instead. Maintained for
+ backwards compatibility.
+ """
+ self.warn_assign_override = False
+
+ def enable_redun_warnings(self):
+ """
+ Do 'Kconfig.warn_assign_redun = True' instead. Maintained for backwards
+ compatibility.
+ """
+ self.warn_assign_redun = True
+
+ def disable_redun_warnings(self):
+ """
+ Do 'Kconfig.warn_assign_redun = False' instead. Maintained for
+ backwards compatibility.
+ """
+ self.warn_assign_redun = False
+
+ def __repr__(self):
+ """
+ Returns a string with information about the Kconfig object when it is
+ evaluated on e.g. the interactive Python prompt.
+ """
+ def status(flag):
+ return "enabled" if flag else "disabled"
+
+ return "<{}>".format(", ".join((
+ "configuration with {} symbols".format(len(self.syms)),
+ 'main menu prompt "{}"'.format(self.mainmenu_text),
+ "srctree is current directory" if not self.srctree else
+ 'srctree "{}"'.format(self.srctree),
+ 'config symbol prefix "{}"'.format(self.config_prefix),
+ "warnings " + status(self.warn),
+ "printing of warnings to stderr " + status(self.warn_to_stderr),
+ "undef. symbol assignment warnings " +
+ status(self.warn_assign_undef),
+ "overriding symbol assignment warnings " +
+ status(self.warn_assign_override),
+ "redundant symbol assignment warnings " +
+ status(self.warn_assign_redun)
+ )))
+
+ #
+ # Private methods
+ #
+
+
+ #
+ # File reading
+ #
+
+ def _open_config(self, filename):
+ # Opens a .config file. First tries to open 'filename', then
+ # '$srctree/filename' if $srctree was set when the configuration was
+ # loaded.
+
+ try:
+ return self._open(filename, "r")
+ except EnvironmentError as e:
+ # This will try opening the same file twice if $srctree is unset,
+ # but it's not a big deal
+ try:
+ return self._open(join(self.srctree, filename), "r")
+ except EnvironmentError as e2:
+ # This is needed for Python 3, because e2 is deleted after
+ # the try block:
+ #
+ # https://docs.python.org/3/reference/compound_stmts.html#the-try-statement
+ e = e2
+
+ raise _KconfigIOError(
+ e, "Could not open '{}' ({}: {}). Check that the $srctree "
+ "environment variable ({}) is set correctly."
+ .format(filename, errno.errorcode[e.errno], e.strerror,
+ "set to '{}'".format(self.srctree) if self.srctree
+ else "unset or blank"))
+
+ def _enter_file(self, filename):
+ # Jumps to the beginning of a sourced Kconfig file, saving the previous
+ # position and file object.
+ #
+ # filename:
+ # Absolute path to file
+
+ # Path relative to $srctree, stored in e.g. self.filename (which makes
+ # it indirectly show up in MenuNode.filename). Equals 'filename' for
+ # absolute paths passed to 'source'.
+ if filename.startswith(self._srctree_prefix):
+ # Relative path (or a redundant absolute path to within $srctree,
+ # but it's probably fine to reduce those too)
+ rel_filename = filename[len(self._srctree_prefix):]
+ else:
+ # Absolute path
+ rel_filename = filename
+
+ self.kconfig_filenames.append(rel_filename)
+
+ # The parent Kconfig files are represented as a list of
+ # (<include path>, <Python 'file' object for Kconfig file>) tuples.
+ #
+ # <include path> is immutable and holds a *tuple* of
+ # (<filename>, <linenr>) tuples, giving the locations of the 'source'
+ # statements in the parent Kconfig files. The current include path is
+ # also available in Kconfig._include_path.
+ #
+ # The point of this redundant setup is to allow Kconfig._include_path
+ # to be assigned directly to MenuNode.include_path without having to
+ # copy it, sharing it wherever possible.
+
+ # Save include path and 'file' object (via its 'readline' function)
+ # before entering the file
+ self._filestack.append((self._include_path, self._readline))
+
+ # _include_path is a tuple, so this rebinds the variable instead of
+ # doing in-place modification
+ self._include_path += ((self.filename, self.linenr),)
+
+ # Check for recursive 'source'
+ for name, _ in self._include_path:
+ if name == rel_filename:
+ raise KconfigError(
+ "\n{}:{}: recursive 'source' of '{}' detected. Check that "
+ "environment variables are set correctly.\n"
+ "Include path:\n{}"
+ .format(self.filename, self.linenr, rel_filename,
+ "\n".join("{}:{}".format(name, linenr)
+ for name, linenr in self._include_path)))
+
+ try:
+ self._readline = self._open(filename, "r").readline
+ except EnvironmentError as e:
+ # We already know that the file exists
+ raise _KconfigIOError(
+ e, "{}:{}: Could not open '{}' (in '{}') ({}: {})"
+ .format(self.filename, self.linenr, filename,
+ self._line.strip(),
+ errno.errorcode[e.errno], e.strerror))
+
+ self.filename = rel_filename
+ self.linenr = 0
+
+ def _leave_file(self):
+ # Returns from a Kconfig file to the file that sourced it. See
+ # _enter_file().
+
+ # Restore location from parent Kconfig file
+ self.filename, self.linenr = self._include_path[-1]
+ # Restore include path and 'file' object
+ self._readline.__self__.close() # __self__ fetches the 'file' object
+ self._include_path, self._readline = self._filestack.pop()
+
+ def _next_line(self):
+ # Fetches and tokenizes the next line from the current Kconfig file.
+ # Returns False at EOF and True otherwise.
+
+ # We might already have tokens from parsing a line and discovering that
+ # it's part of a different construct
+ if self._reuse_tokens:
+ self._reuse_tokens = False
+ # self._tokens_i is known to be 1 here, because _parse_properties()
+ # leaves it like that when it can't recognize a line (or parses
+ # a help text)
+ return True
+
+ # readline() returns '' over and over at EOF, which we rely on for help
+ # texts at the end of files (see _line_after_help())
+ line = self._readline()
+ if not line:
+ return False
+ self.linenr += 1
+
+ # Handle line joining
+ while line.endswith("\\\n"):
+ line = line[:-2] + self._readline()
+ self.linenr += 1
+
+ self._tokens = self._tokenize(line)
+ # Initialize to 1 instead of 0 to factor out code from _parse_block()
+ # and _parse_properties(). They immediately fetch self._tokens[0].
+ self._tokens_i = 1
+
+ return True
+
+ def _line_after_help(self, line):
+ # Tokenizes a line after a help text. This case is special in that the
+ # line has already been fetched (to discover that it isn't part of the
+ # help text).
+ #
+ # An earlier version used a _saved_line variable instead that was
+ # checked in _next_line(). This special-casing gets rid of it and makes
+ # _reuse_tokens alone sufficient to handle unget.
+
+ # Handle line joining
+ while line.endswith("\\\n"):
+ line = line[:-2] + self._readline()
+ self.linenr += 1
+
+ self._tokens = self._tokenize(line)
+ self._reuse_tokens = True
+
+ def _write_if_changed(self, filename, contents):
+ # Writes 'contents' into 'filename', but only if it differs from the
+ # current contents of the file.
+ #
+ # Another variant would be write a temporary file on the same
+ # filesystem, compare the files, and rename() the temporary file if it
+ # differs, but it breaks stuff like write_config("/dev/null"), which is
+ # used out there to force evaluation-related warnings to be generated.
+ # This simple version is pretty failsafe and portable.
+
+ if not self._contents_eq(filename, contents):
+ with self._open(filename, "w") as f:
+ f.write(contents)
+
+ def _contents_eq(self, filename, contents):
+ # Returns True if the contents of 'filename' is 'contents' (a string),
+ # and False otherwise (including if 'filename' can't be opened/read)
+
+ try:
+ with self._open(filename, "r") as f:
+ # Robust re. things like encoding and line endings (mmap()
+ # trickery isn't)
+ return f.read(len(contents) + 1) == contents
+ except EnvironmentError:
+ # If the error here would prevent writing the file as well, we'll
+ # notice it later
+ return False
+
+ #
+ # Tokenization
+ #
+
+ def _lookup_sym(self, name):
+ # Fetches the symbol 'name' from the symbol table, creating and
+ # registering it if it does not exist. If '_parsing_kconfigs' is False,
+ # it means we're in eval_string(), and new symbols won't be registered.
+
+ if name in self.syms:
+ return self.syms[name]
+
+ sym = Symbol()
+ sym.kconfig = self
+ sym.name = name
+ sym.is_constant = False
+ sym.rev_dep = sym.weak_rev_dep = sym.direct_dep = self.n
+
+ if self._parsing_kconfigs:
+ self.syms[name] = sym
+ else:
+ self._warn("no symbol {} in configuration".format(name))
+
+ return sym
+
+ def _lookup_const_sym(self, name):
+ # Like _lookup_sym(), for constant (quoted) symbols
+
+ if name in self.const_syms:
+ return self.const_syms[name]
+
+ sym = Symbol()
+ sym.kconfig = self
+ sym.name = name
+ sym.is_constant = True
+ sym.rev_dep = sym.weak_rev_dep = sym.direct_dep = self.n
+
+ if self._parsing_kconfigs:
+ self.const_syms[name] = sym
+
+ return sym
+
+ def _tokenize(self, s):
+ # Parses 's', returning a None-terminated list of tokens. Registers any
+ # new symbols encountered with _lookup(_const)_sym().
+ #
+ # Tries to be reasonably speedy by processing chunks of text via
+ # regexes and string operations where possible. This is the biggest
+ # hotspot during parsing.
+ #
+ # It might be possible to rewrite this to 'yield' tokens instead,
+ # working across multiple lines. Lookback and compatibility with old
+ # janky versions of the C tools complicate things though.
+
+ self._line = s # Used for error reporting
+
+ # Initial token on the line
+ match = _command_match(s)
+ if not match:
+ if s.isspace() or s.lstrip().startswith("#"):
+ return (None,)
+ self._parse_error("unknown token at start of line")
+
+ # Tricky implementation detail: While parsing a token, 'token' refers
+ # to the previous token. See _STRING_LEX for why this is needed.
+ token = _get_keyword(match.group(1))
+ if not token:
+ # Backwards compatibility with old versions of the C tools, which
+ # (accidentally) accepted stuff like "--help--" and "-help---".
+ # This was fixed in the C tools by commit c2264564 ("kconfig: warn
+ # of unhandled characters in Kconfig commands"), committed in July
+ # 2015, but it seems people still run Kconfiglib on older kernels.
+ if s.strip(" \t\n-") == "help":
+ return (_T_HELP, None)
+
+ # If the first token is not a keyword (and not a weird help token),
+ # we have a preprocessor variable assignment (or a bare macro on a
+ # line)
+ self._parse_assignment(s)
+ return (None,)
+
+ tokens = [token]
+ # The current index in the string being tokenized
+ i = match.end()
+
+ # Main tokenization loop (for tokens past the first one)
+ while i < len(s):
+ # Test for an identifier/keyword first. This is the most common
+ # case.
+ match = _id_keyword_match(s, i)
+ if match:
+ # We have an identifier or keyword
+
+ # Check what it is. lookup_sym() will take care of allocating
+ # new symbols for us the first time we see them. Note that
+ # 'token' still refers to the previous token.
+
+ name = match.group(1)
+ keyword = _get_keyword(name)
+ if keyword:
+ # It's a keyword
+ token = keyword
+ # Jump past it
+ i = match.end()
+
+ elif token not in _STRING_LEX:
+ # It's a non-const symbol, except we translate n, m, and y
+ # into the corresponding constant symbols, like the C
+ # implementation
+
+ if "$" in name:
+ # Macro expansion within symbol name
+ name, s, i = self._expand_name(s, i)
+ else:
+ i = match.end()
+
+ token = self.const_syms[name] if name in STR_TO_TRI else \
+ self._lookup_sym(name)
+
+ else:
+ # It's a case of missing quotes. For example, the
+ # following is accepted:
+ #
+ # menu unquoted_title
+ #
+ # config A
+ # tristate unquoted_prompt
+ #
+ # endmenu
+ #
+ # Named choices ('choice FOO') also end up here.
+
+ if token is not _T_CHOICE:
+ self._warn("style: quotes recommended around '{}' in '{}'"
+ .format(name, self._line.strip()),
+ self.filename, self.linenr)
+
+ token = name
+ i = match.end()
+
+ else:
+ # Neither a keyword nor a non-const symbol
+
+ # We always strip whitespace after tokens, so it is safe to
+ # assume that s[i] is the start of a token here.
+ c = s[i]
+
+ if c in "\"'":
+ if "$" not in s and "\\" not in s:
+ # Fast path for lines without $ and \. Find the
+ # matching quote.
+ end_i = s.find(c, i + 1) + 1
+ if not end_i:
+ self._parse_error("unterminated string")
+ val = s[i + 1:end_i - 1]
+ i = end_i
+ else:
+ # Slow path
+ s, end_i = self._expand_str(s, i)
+
+ # os.path.expandvars() and the $UNAME_RELEASE replace()
+ # is a backwards compatibility hack, which should be
+ # reasonably safe as expandvars() leaves references to
+ # undefined env. vars. as is.
+ #
+ # The preprocessor functionality changed how
+ # environment variables are referenced, to $(FOO).
+ val = expandvars(s[i + 1:end_i - 1]
+ .replace("$UNAME_RELEASE",
+ _UNAME_RELEASE))
+
+ i = end_i
+
+ # This is the only place where we don't survive with a
+ # single token of lookback: 'option env="FOO"' does not
+ # refer to a constant symbol named "FOO".
+ token = \
+ val if token in _STRING_LEX or tokens[0] is _T_OPTION \
+ else self._lookup_const_sym(val)
+
+ elif s.startswith("&&", i):
+ token = _T_AND
+ i += 2
+
+ elif s.startswith("||", i):
+ token = _T_OR
+ i += 2
+
+ elif c == "=":
+ token = _T_EQUAL
+ i += 1
+
+ elif s.startswith("!=", i):
+ token = _T_UNEQUAL
+ i += 2
+
+ elif c == "!":
+ token = _T_NOT
+ i += 1
+
+ elif c == "(":
+ token = _T_OPEN_PAREN
+ i += 1
+
+ elif c == ")":
+ token = _T_CLOSE_PAREN
+ i += 1
+
+ elif c == "#":
+ break
+
+
+ # Very rare
+
+ elif s.startswith("<=", i):
+ token = _T_LESS_EQUAL
+ i += 2
+
+ elif c == "<":
+ token = _T_LESS
+ i += 1
+
+ elif s.startswith(">=", i):
+ token = _T_GREATER_EQUAL
+ i += 2
+
+ elif c == ">":
+ token = _T_GREATER
+ i += 1
+
+
+ else:
+ self._parse_error("unknown tokens in line")
+
+
+ # Skip trailing whitespace
+ while i < len(s) and s[i].isspace():
+ i += 1
+
+
+ # Add the token
+ tokens.append(token)
+
+ # None-terminating the token list makes token fetching simpler/faster
+ tokens.append(None)
+
+ return tokens
+
+ # Helpers for syntax checking and token fetching. See the
+ # 'Intro to expressions' section for what a constant symbol is.
+ #
+ # More of these could be added, but the single-use cases are inlined as an
+ # optimization.
+
+ def _expect_sym(self):
+ token = self._tokens[self._tokens_i]
+ self._tokens_i += 1
+
+ if token.__class__ is not Symbol:
+ self._parse_error("expected symbol")
+
+ return token
+
+ def _expect_nonconst_sym(self):
+ # Used for 'select' and 'imply' only. We know the token indices.
+
+ token = self._tokens[1]
+ self._tokens_i = 2
+
+ if token.__class__ is not Symbol or token.is_constant:
+ self._parse_error("expected nonconstant symbol")
+
+ return token
+
+ def _expect_str_and_eol(self):
+ token = self._tokens[self._tokens_i]
+ self._tokens_i += 1
+
+ if token.__class__ is not str:
+ self._parse_error("expected string")
+
+ if self._tokens[self._tokens_i] is not None:
+ self._trailing_tokens_error()
+
+ return token
+
+ def _expect_expr_and_eol(self):
+ expr = self._parse_expr(True)
+
+ if self._tokens[self._tokens_i] is not None:
+ self._trailing_tokens_error()
+
+ return expr
+
+ def _check_token(self, token):
+ # If the next token is 'token', removes it and returns True
+
+ if self._tokens[self._tokens_i] is token:
+ self._tokens_i += 1
+ return True
+ return False
+
+ #
+ # Preprocessor logic
+ #
+
+ def _parse_assignment(self, s):
+ # Parses a preprocessor variable assignment, registering the variable
+ # if it doesn't already exist. Also takes care of bare macros on lines
+ # (which are allowed, and can be useful for their side effects).
+
+ # Expand any macros in the left-hand side of the assignment (the
+ # variable name)
+ s = s.lstrip()
+ i = 0
+ while 1:
+ i = _assignment_lhs_fragment_match(s, i).end()
+ if s.startswith("$(", i):
+ s, i = self._expand_macro(s, i, ())
+ else:
+ break
+
+ if s.isspace():
+ # We also accept a bare macro on a line (e.g.
+ # $(warning-if,$(foo),ops)), provided it expands to a blank string
+ return
+
+ # Assigned variable
+ name = s[:i]
+
+
+ # Extract assignment operator (=, :=, or +=) and value
+ rhs_match = _assignment_rhs_match(s, i)
+ if not rhs_match:
+ self._parse_error("syntax error")
+
+ op, val = rhs_match.groups()
+
+
+ if name in self.variables:
+ # Already seen variable
+ var = self.variables[name]
+ else:
+ # New variable
+ var = Variable()
+ var.kconfig = self
+ var.name = name
+ var._n_expansions = 0
+ self.variables[name] = var
+
+ # += acts like = on undefined variables (defines a recursive
+ # variable)
+ if op == "+=":
+ op = "="
+
+ if op == "=":
+ var.is_recursive = True
+ var.value = val
+ elif op == ":=":
+ var.is_recursive = False
+ var.value = self._expand_whole(val, ())
+ else: # op == "+="
+ # += does immediate expansion if the variable was last set
+ # with :=
+ var.value += " " + (val if var.is_recursive else
+ self._expand_whole(val, ()))
+
+ def _expand_whole(self, s, args):
+ # Expands preprocessor macros in all of 's'. Used whenever we don't
+ # have to worry about delimiters. See _expand_macro() re. the 'args'
+ # parameter.
+ #
+ # Returns the expanded string.
+
+ i = 0
+ while 1:
+ i = s.find("$(", i)
+ if i == -1:
+ break
+ s, i = self._expand_macro(s, i, args)
+ return s
+
+ def _expand_name(self, s, i):
+ # Expands a symbol name starting at index 'i' in 's'.
+ #
+ # Returns the expanded name, the expanded 's' (including the part
+ # before the name), and the index of the first character in the next
+ # token after the name.
+
+ s, end_i = self._expand_name_iter(s, i)
+ name = s[i:end_i]
+ # isspace() is False for empty strings
+ if not name.strip():
+ # Avoid creating a Kconfig symbol with a blank name. It's almost
+ # guaranteed to be an error.
+ self._parse_error("macro expanded to blank string")
+
+ # Skip trailing whitespace
+ while end_i < len(s) and s[end_i].isspace():
+ end_i += 1
+
+ return name, s, end_i
+
+ def _expand_name_iter(self, s, i):
+ # Expands a symbol name starting at index 'i' in 's'.
+ #
+ # Returns the expanded 's' (including the part before the name) and the
+ # index of the first character after the expanded name in 's'.
+
+ while 1:
+ match = _name_special_search(s, i)
+
+ if match.group() == "$(":
+ s, i = self._expand_macro(s, match.start(), ())
+ else:
+ return (s, match.start())
+
+ def _expand_str(self, s, i):
+ # Expands a quoted string starting at index 'i' in 's'. Handles both
+ # backslash escapes and macro expansion.
+ #
+ # Returns the expanded 's' (including the part before the string) and
+ # the index of the first character after the expanded string in 's'.
+
+ quote = s[i]
+ i += 1 # Skip over initial "/'
+ while 1:
+ match = _string_special_search(s, i)
+ if not match:
+ self._parse_error("unterminated string")
+
+
+ if match.group() == quote:
+ # Found the end of the string
+ return (s, match.end())
+
+ elif match.group() == "\\":
+ # Replace '\x' with 'x'. 'i' ends up pointing to the character
+ # after 'x', which allows macros to be canceled with '\$(foo)'.
+ i = match.end()
+ s = s[:match.start()] + s[i:]
+
+ elif match.group() == "$(":
+ # A macro call within the string
+ s, i = self._expand_macro(s, match.start(), ())
+
+ else:
+ # A ' quote within " quotes or vice versa
+ i += 1
+
+ def _expand_macro(self, s, i, args):
+ # Expands a macro starting at index 'i' in 's'. If this macro resulted
+ # from the expansion of another macro, 'args' holds the arguments
+ # passed to that macro.
+ #
+ # Returns the expanded 's' (including the part before the macro) and
+ # the index of the first character after the expanded macro in 's'.
+
+ start = i
+ i += 2 # Skip over "$("
+
+ # Start of current macro argument
+ arg_start = i
+
+ # Arguments of this macro call
+ new_args = []
+
+ while 1:
+ match = _macro_special_search(s, i)
+ if not match:
+ self._parse_error("missing end parenthesis in macro expansion")
+
+
+ if match.group() == ")":
+ # Found the end of the macro
+
+ new_args.append(s[arg_start:match.start()])
+
+ prefix = s[:start]
+
+ # $(1) is replaced by the first argument to the function, etc.,
+ # provided at least that many arguments were passed
+
+ try:
+ # Does the macro look like an integer, with a corresponding
+ # argument? If so, expand it to the value of the argument.
+ prefix += args[int(new_args[0])]
+ except (ValueError, IndexError):
+ # Regular variables are just functions without arguments,
+ # and also go through the function value path
+ prefix += self._fn_val(new_args)
+
+ return (prefix + s[match.end():],
+ len(prefix))
+
+ elif match.group() == ",":
+ # Found the end of a macro argument
+ new_args.append(s[arg_start:match.start()])
+ arg_start = i = match.end()
+
+ else: # match.group() == "$("
+ # A nested macro call within the macro
+ s, i = self._expand_macro(s, match.start(), args)
+
+ def _fn_val(self, args):
+ # Returns the result of calling the function args[0] with the arguments
+ # args[1..len(args)-1]. Plain variables are treated as functions
+ # without arguments.
+
+ fn = args[0]
+
+ if fn in self.variables:
+ var = self.variables[fn]
+
+ if len(args) == 1:
+ # Plain variable
+ if var._n_expansions:
+ self._parse_error("Preprocessor variable {} recursively "
+ "references itself".format(var.name))
+ elif var._n_expansions > 100:
+ # Allow functions to call themselves, but guess that functions
+ # that are overly recursive are stuck
+ self._parse_error("Preprocessor function {} seems stuck "
+ "in infinite recursion".format(var.name))
+
+ var._n_expansions += 1
+ res = self._expand_whole(self.variables[fn].value, args)
+ var._n_expansions -= 1
+ return res
+
+ if fn in self._functions:
+ # Built-in or user-defined function
+
+ py_fn, min_arg, max_arg = self._functions[fn]
+
+ if len(args) - 1 < min_arg or \
+ (max_arg is not None and len(args) - 1 > max_arg):
+
+ if min_arg == max_arg:
+ expected_args = min_arg
+ elif max_arg is None:
+ expected_args = "{} or more".format(min_arg)
+ else:
+ expected_args = "{}-{}".format(min_arg, max_arg)
+
+ raise KconfigError("{}:{}: bad number of arguments in call "
+ "to {}, expected {}, got {}"
+ .format(self.filename, self.linenr, fn,
+ expected_args, len(args) - 1))
+
+ return py_fn(self, *args)
+
+ # Environment variables are tried last
+ if fn in os.environ:
+ self.env_vars.add(fn)
+ return os.environ[fn]
+
+ return ""
+
+ #
+ # Parsing
+ #
+
+ def _make_and(self, e1, e2):
+ # Constructs an AND (&&) expression. Performs trivial simplification.
+
+ if e1 is self.y:
+ return e2
+
+ if e2 is self.y:
+ return e1
+
+ if e1 is self.n or e2 is self.n:
+ return self.n
+
+ return (AND, e1, e2)
+
+ def _make_or(self, e1, e2):
+ # Constructs an OR (||) expression. Performs trivial simplification.
+
+ if e1 is self.n:
+ return e2
+
+ if e2 is self.n:
+ return e1
+
+ if e1 is self.y or e2 is self.y:
+ return self.y
+
+ return (OR, e1, e2)
+
+ def _parse_block(self, end_token, parent, prev):
+ # Parses a block, which is the contents of either a file or an if,
+ # menu, or choice statement.
+ #
+ # end_token:
+ # The token that ends the block, e.g. _T_ENDIF ("endif") for ifs.
+ # None for files.
+ #
+ # parent:
+ # The parent menu node, corresponding to a menu, Choice, or 'if'.
+ # 'if's are flattened after parsing.
+ #
+ # prev:
+ # The previous menu node. New nodes will be added after this one (by
+ # modifying their 'next' pointer).
+ #
+ # 'prev' is reused to parse a list of child menu nodes (for a menu or
+ # Choice): After parsing the children, the 'next' pointer is assigned
+ # to the 'list' pointer to "tilt up" the children above the node.
+ #
+ # Returns the final menu node in the block (or 'prev' if the block is
+ # empty). This allows chaining.
+
+ while self._next_line():
+ t0 = self._tokens[0]
+
+ if t0 is _T_CONFIG or t0 is _T_MENUCONFIG:
+ # The tokenizer allocates Symbol objects for us
+ sym = self._tokens[1]
+
+ if sym.__class__ is not Symbol or sym.is_constant:
+ self._parse_error("missing or bad symbol name")
+
+ if self._tokens[2] is not None:
+ self._trailing_tokens_error()
+
+ self.defined_syms.append(sym)
+
+ node = MenuNode()
+ node.kconfig = self
+ node.item = sym
+ node.is_menuconfig = (t0 is _T_MENUCONFIG)
+ node.prompt = node.help = node.list = None
+ node.parent = parent
+ node.filename = self.filename
+ node.linenr = self.linenr
+ node.include_path = self._include_path
+
+ sym.nodes.append(node)
+
+ self._parse_properties(node)
+
+ if node.is_menuconfig and not node.prompt:
+ self._warn("the menuconfig symbol {} has no prompt"
+ .format(_name_and_loc(sym)))
+
+ # Equivalent to
+ #
+ # prev.next = node
+ # prev = node
+ #
+ # due to tricky Python semantics. The order matters.
+ prev.next = prev = node
+
+ elif t0 is None:
+ # Blank line
+ continue
+
+ elif t0 in _SOURCE_TOKENS:
+ pattern = self._expect_str_and_eol()
+
+ if t0 in _REL_SOURCE_TOKENS:
+ # Relative source
+ pattern = join(dirname(self.filename), pattern)
+
+ # - glob() doesn't support globbing relative to a directory, so
+ # we need to prepend $srctree to 'pattern'. Use join()
+ # instead of '+' so that an absolute path in 'pattern' is
+ # preserved.
+ #
+ # - Sort the glob results to ensure a consistent ordering of
+ # Kconfig symbols, which indirectly ensures a consistent
+ # ordering in e.g. .config files
+ filenames = sorted(iglob(join(self._srctree_prefix, pattern)))
+
+ if not filenames and t0 in _OBL_SOURCE_TOKENS:
+ raise KconfigError(
+ "{}:{}: '{}' not found (in '{}'). Check that "
+ "environment variables are set correctly (e.g. "
+ "$srctree, which is {}). Also note that unset "
+ "environment variables expand to the empty string."
+ .format(self.filename, self.linenr, pattern,
+ self._line.strip(),
+ "set to '{}'".format(self.srctree)
+ if self.srctree else "unset or blank"))
+
+ for filename in filenames:
+ self._enter_file(filename)
+ prev = self._parse_block(None, parent, prev)
+ self._leave_file()
+
+ elif t0 is end_token:
+ # Reached the end of the block. Terminate the final node and
+ # return it.
+
+ if self._tokens[1] is not None:
+ self._trailing_tokens_error()
+
+ prev.next = None
+ return prev
+
+ elif t0 is _T_IF:
+ node = MenuNode()
+ node.item = node.prompt = None
+ node.parent = parent
+ node.dep = self._expect_expr_and_eol()
+
+ self._parse_block(_T_ENDIF, node, node)
+ node.list = node.next
+
+ prev.next = prev = node
+
+ elif t0 is _T_MENU:
+ node = MenuNode()
+ node.kconfig = self
+ node.item = t0 # _T_MENU == MENU
+ node.is_menuconfig = True
+ node.prompt = (self._expect_str_and_eol(), self.y)
+ node.visibility = self.y
+ node.parent = parent
+ node.filename = self.filename
+ node.linenr = self.linenr
+ node.include_path = self._include_path
+
+ self.menus.append(node)
+
+ self._parse_properties(node)
+ self._parse_block(_T_ENDMENU, node, node)
+ node.list = node.next
+
+ prev.next = prev = node
+
+ elif t0 is _T_COMMENT:
+ node = MenuNode()
+ node.kconfig = self
+ node.item = t0 # _T_COMMENT == COMMENT
+ node.is_menuconfig = False
+ node.prompt = (self._expect_str_and_eol(), self.y)
+ node.list = None
+ node.parent = parent
+ node.filename = self.filename
+ node.linenr = self.linenr
+ node.include_path = self._include_path
+
+ self.comments.append(node)
+
+ self._parse_properties(node)
+
+ prev.next = prev = node
+
+ elif t0 is _T_CHOICE:
+ if self._tokens[1] is None:
+ choice = Choice()
+ choice.direct_dep = self.n
+ else:
+ # Named choice
+ name = self._expect_str_and_eol()
+ choice = self.named_choices.get(name)
+ if not choice:
+ choice = Choice()
+ choice.name = name
+ choice.direct_dep = self.n
+ self.named_choices[name] = choice
+
+ self.choices.append(choice)
+
+ node = MenuNode()
+ node.kconfig = choice.kconfig = self
+ node.item = choice
+ node.is_menuconfig = True
+ node.prompt = node.help = None
+ node.parent = parent
+ node.filename = self.filename
+ node.linenr = self.linenr
+ node.include_path = self._include_path
+
+ choice.nodes.append(node)
+
+ self._parse_properties(node)
+ self._parse_block(_T_ENDCHOICE, node, node)
+ node.list = node.next
+
+ prev.next = prev = node
+
+ elif t0 is _T_MAINMENU:
+ self.top_node.prompt = (self._expect_str_and_eol(), self.y)
+
+ else:
+ # A valid endchoice/endif/endmenu is caught by the 'end_token'
+ # check above
+ self._parse_error(
+ "no corresponding 'choice'" if t0 is _T_ENDCHOICE else
+ "no corresponding 'if'" if t0 is _T_ENDIF else
+ "no corresponding 'menu'" if t0 is _T_ENDMENU else
+ "unrecognized construct")
+
+ # End of file reached. Terminate the final node and return it.
+
+ if end_token:
+ raise KconfigError(
+ "expected '{}' at end of '{}'"
+ .format("endchoice" if end_token is _T_ENDCHOICE else
+ "endif" if end_token is _T_ENDIF else
+ "endmenu",
+ self.filename))
+
+ prev.next = None
+ return prev
+
+ def _parse_cond(self):
+ # Parses an optional 'if <expr>' construct and returns the parsed
+ # <expr>, or self.y if the next token is not _T_IF
+
+ expr = self._parse_expr(True) if self._check_token(_T_IF) else self.y
+
+ if self._tokens[self._tokens_i] is not None:
+ self._trailing_tokens_error()
+
+ return expr
+
+ def _parse_properties(self, node):
+ # Parses and adds properties to the MenuNode 'node' (type, 'prompt',
+ # 'default's, etc.) Properties are later copied up to symbols and
+ # choices in a separate pass after parsing, in e.g.
+ # _add_props_to_sym().
+ #
+ # An older version of this code added properties directly to symbols
+ # and choices instead of to their menu nodes (and handled dependency
+ # propagation simultaneously), but that loses information on where a
+ # property is added when a symbol or choice is defined in multiple
+ # locations. Some Kconfig configuration systems rely heavily on such
+ # symbols, and better docs can be generated by keeping track of where
+ # properties are added.
+ #
+ # node:
+ # The menu node we're parsing properties on
+
+ # Dependencies from 'depends on'. Will get propagated to the properties
+ # below.
+ node.dep = self.y
+
+ while self._next_line():
+ t0 = self._tokens[0]
+
+ if t0 in _TYPE_TOKENS:
+ # Relies on '_T_BOOL is BOOL', etc., to save a conversion
+ self._set_type(node, t0)
+ if self._tokens[1] is not None:
+ self._parse_prompt(node)
+
+ elif t0 is _T_DEPENDS:
+ if not self._check_token(_T_ON):
+ self._parse_error("expected 'on' after 'depends'")
+
+ node.dep = self._make_and(node.dep,
+ self._expect_expr_and_eol())
+
+ elif t0 is _T_HELP:
+ self._parse_help(node)
+
+ elif t0 is _T_SELECT:
+ if node.item.__class__ is not Symbol:
+ self._parse_error("only symbols can select")
+
+ node.selects.append((self._expect_nonconst_sym(),
+ self._parse_cond()))
+
+ elif t0 is None:
+ # Blank line
+ continue
+
+ elif t0 is _T_DEFAULT:
+ node.defaults.append((self._parse_expr(False),
+ self._parse_cond()))
+
+ elif t0 in _DEF_TOKEN_TO_TYPE:
+ self._set_type(node, _DEF_TOKEN_TO_TYPE[t0])
+ node.defaults.append((self._parse_expr(False),
+ self._parse_cond()))
+
+ elif t0 is _T_PROMPT:
+ self._parse_prompt(node)
+
+ elif t0 is _T_RANGE:
+ node.ranges.append((self._expect_sym(), self._expect_sym(),
+ self._parse_cond()))
+
+ elif t0 is _T_IMPLY:
+ if node.item.__class__ is not Symbol:
+ self._parse_error("only symbols can imply")
+
+ node.implies.append((self._expect_nonconst_sym(),
+ self._parse_cond()))
+
+ elif t0 is _T_VISIBLE:
+ if not self._check_token(_T_IF):
+ self._parse_error("expected 'if' after 'visible'")
+
+ node.visibility = self._make_and(node.visibility,
+ self._expect_expr_and_eol())
+
+ elif t0 is _T_OPTION:
+ if self._check_token(_T_ENV):
+ if not self._check_token(_T_EQUAL):
+ self._parse_error("expected '=' after 'env'")
+
+ env_var = self._expect_str_and_eol()
+ node.item.env_var = env_var
+
+ if env_var in os.environ:
+ node.defaults.append(
+ (self._lookup_const_sym(os.environ[env_var]),
+ self.y))
+ else:
+ self._warn("{1} has 'option env=\"{0}\"', "
+ "but the environment variable {0} is not "
+ "set".format(node.item.name, env_var),
+ self.filename, self.linenr)
+
+ if env_var != node.item.name:
+ self._warn("Kconfiglib expands environment variables "
+ "in strings directly, meaning you do not "
+ "need 'option env=...' \"bounce\" symbols. "
+ "For compatibility with the C tools, "
+ "rename {} to {} (so that the symbol name "
+ "matches the environment variable name)."
+ .format(node.item.name, env_var),
+ self.filename, self.linenr)
+
+ elif self._check_token(_T_DEFCONFIG_LIST):
+ if not self.defconfig_list:
+ self.defconfig_list = node.item
+ else:
+ self._warn("'option defconfig_list' set on multiple "
+ "symbols ({0} and {1}). Only {0} will be "
+ "used.".format(self.defconfig_list.name,
+ node.item.name),
+ self.filename, self.linenr)
+
+ elif self._check_token(_T_MODULES):
+ # To reduce warning spam, only warn if 'option modules' is
+ # set on some symbol that isn't MODULES, which should be
+ # safe. I haven't run into any projects that make use
+ # modules besides the kernel yet, and there it's likely to
+ # keep being called "MODULES".
+ if node.item is not self.modules:
+ self._warn("the 'modules' option is not supported. "
+ "Let me know if this is a problem for you, "
+ "as it wouldn't be that hard to implement. "
+ "Note that modules are supported -- "
+ "Kconfiglib just assumes the symbol name "
+ "MODULES, like older versions of the C "
+ "implementation did when 'option modules' "
+ "wasn't used.",
+ self.filename, self.linenr)
+
+ elif self._check_token(_T_ALLNOCONFIG_Y):
+ if node.item.__class__ is not Symbol:
+ self._parse_error("the 'allnoconfig_y' option is only "
+ "valid for symbols")
+
+ node.item.is_allnoconfig_y = True
+
+ else:
+ self._parse_error("unrecognized option")
+
+ elif t0 is _T_OPTIONAL:
+ if node.item.__class__ is not Choice:
+ self._parse_error('"optional" is only valid for choices')
+
+ node.item.is_optional = True
+
+ else:
+ # Reuse the tokens for the non-property line later
+ self._reuse_tokens = True
+ return
+
+ def _set_type(self, node, new_type):
+ # UNKNOWN is falsy
+ if node.item.orig_type and node.item.orig_type is not new_type:
+ self._warn("{} defined with multiple types, {} will be used"
+ .format(_name_and_loc(node.item),
+ TYPE_TO_STR[new_type]))
+
+ node.item.orig_type = new_type
+
+ def _parse_prompt(self, node):
+ # 'prompt' properties override each other within a single definition of
+ # a symbol, but additional prompts can be added by defining the symbol
+ # multiple times
+
+ if node.prompt:
+ self._warn(_name_and_loc(node.item) +
+ " defined with multiple prompts in single location")
+
+ prompt = self._tokens[1]
+ self._tokens_i = 2
+
+ if prompt.__class__ is not str:
+ self._parse_error("expected prompt string")
+
+ if prompt != prompt.strip():
+ self._warn(_name_and_loc(node.item) +
+ " has leading or trailing whitespace in its prompt")
+
+ # This avoid issues for e.g. reStructuredText documentation, where
+ # '*prompt *' is invalid
+ prompt = prompt.strip()
+
+ node.prompt = (prompt, self._parse_cond())
+
+ def _parse_help(self, node):
+ if node.help is not None:
+ self._warn(_name_and_loc(node.item) + " defined with more than "
+ "one help text -- only the last one will be used")
+
+ # Micro-optimization. This code is pretty hot.
+ readline = self._readline
+
+ # Find first non-blank (not all-space) line and get its
+ # indentation
+
+ while 1:
+ line = readline()
+ self.linenr += 1
+ if not line:
+ self._empty_help(node, line)
+ return
+ if not line.isspace():
+ break
+
+ len_ = len # Micro-optimization
+
+ # Use a separate 'expline' variable here and below to avoid stomping on
+ # any tabs people might've put deliberately into the first line after
+ # the help text
+ expline = line.expandtabs()
+ indent = len_(expline) - len_(expline.lstrip())
+ if not indent:
+ self._empty_help(node, line)
+ return
+
+ # The help text goes on till the first non-blank line with less indent
+ # than the first line
+
+ # Add the first line
+ lines = [expline[indent:]]
+ add_line = lines.append # Micro-optimization
+
+ while 1:
+ line = readline()
+ if line.isspace():
+ # No need to preserve the exact whitespace in these
+ add_line("\n")
+ elif not line:
+ # End of file
+ break
+ else:
+ expline = line.expandtabs()
+ if len_(expline) - len_(expline.lstrip()) < indent:
+ break
+ add_line(expline[indent:])
+
+ self.linenr += len_(lines)
+ node.help = "".join(lines).rstrip()
+ if line:
+ self._line_after_help(line)
+
+ def _empty_help(self, node, line):
+ self._warn(_name_and_loc(node.item) +
+ " has 'help' but empty help text")
+ node.help = ""
+ if line:
+ self._line_after_help(line)
+
+ def _parse_expr(self, transform_m):
+ # Parses an expression from the tokens in Kconfig._tokens using a
+ # simple top-down approach. See the module docstring for the expression
+ # format.
+ #
+ # transform_m:
+ # True if m should be rewritten to m && MODULES. See the
+ # Kconfig.eval_string() documentation.
+
+ # Grammar:
+ #
+ # expr: and_expr ['||' expr]
+ # and_expr: factor ['&&' and_expr]
+ # factor: <symbol> ['='/'!='/'<'/... <symbol>]
+ # '!' factor
+ # '(' expr ')'
+ #
+ # It helps to think of the 'expr: and_expr' case as a single-operand OR
+ # (no ||), and of the 'and_expr: factor' case as a single-operand AND
+ # (no &&). Parsing code is always a bit tricky.
+
+ # Mind dump: parse_factor() and two nested loops for OR and AND would
+ # work as well. The straightforward implementation there gives a
+ # (op, (op, (op, A, B), C), D) parse for A op B op C op D. Representing
+ # expressions as (op, [list of operands]) instead goes nicely with that
+ # version, but is wasteful for short expressions and complicates
+ # expression evaluation and other code that works on expressions (more
+ # complicated code likely offsets any performance gain from less
+ # recursion too). If we also try to optimize the list representation by
+ # merging lists when possible (e.g. when ANDing two AND expressions),
+ # we end up allocating a ton of lists instead of reusing expressions,
+ # which is bad.
+
+ and_expr = self._parse_and_expr(transform_m)
+
+ # Return 'and_expr' directly if we have a "single-operand" OR.
+ # Otherwise, parse the expression on the right and make an OR node.
+ # This turns A || B || C || D into (OR, A, (OR, B, (OR, C, D))).
+ return and_expr if not self._check_token(_T_OR) else \
+ (OR, and_expr, self._parse_expr(transform_m))
+
+ def _parse_and_expr(self, transform_m):
+ factor = self._parse_factor(transform_m)
+
+ # Return 'factor' directly if we have a "single-operand" AND.
+ # Otherwise, parse the right operand and make an AND node. This turns
+ # A && B && C && D into (AND, A, (AND, B, (AND, C, D))).
+ return factor if not self._check_token(_T_AND) else \
+ (AND, factor, self._parse_and_expr(transform_m))
+
+ def _parse_factor(self, transform_m):
+ token = self._tokens[self._tokens_i]
+ self._tokens_i += 1
+
+ if token.__class__ is Symbol:
+ # Plain symbol or relation
+
+ if self._tokens[self._tokens_i] not in _RELATIONS:
+ # Plain symbol
+
+ # For conditional expressions ('depends on <expr>',
+ # '... if <expr>', etc.), m is rewritten to m && MODULES.
+ if transform_m and token is self.m:
+ return (AND, self.m, self.modules)
+
+ return token
+
+ # Relation
+ #
+ # _T_EQUAL, _T_UNEQUAL, etc., deliberately have the same values as
+ # EQUAL, UNEQUAL, etc., so we can just use the token directly
+ self._tokens_i += 1
+ return (self._tokens[self._tokens_i - 1], token,
+ self._expect_sym())
+
+ if token is _T_NOT:
+ # token == _T_NOT == NOT
+ return (token, self._parse_factor(transform_m))
+
+ if token is _T_OPEN_PAREN:
+ expr_parse = self._parse_expr(transform_m)
+ if self._check_token(_T_CLOSE_PAREN):
+ return expr_parse
+
+ self._parse_error("malformed expression")
+
+ #
+ # Caching and invalidation
+ #
+
+ def _build_dep(self):
+ # Populates the Symbol/Choice._dependents sets, which contain all other
+ # items (symbols and choices) that immediately depend on the item in
+ # the sense that changing the value of the item might affect the value
+ # of the dependent items. This is used for caching/invalidation.
+ #
+ # The calculated sets might be larger than necessary as we don't do any
+ # complex analysis of the expressions.
+
+ make_depend_on = _make_depend_on # Micro-optimization
+
+ # Only calculate _dependents for defined symbols. Constant and
+ # undefined symbols could theoretically be selected/implied, but it
+ # wouldn't change their value, so it's not a true dependency.
+ for sym in self.unique_defined_syms:
+ # Symbols depend on the following:
+
+ # The prompt conditions
+ for node in sym.nodes:
+ if node.prompt:
+ make_depend_on(sym, node.prompt[1])
+
+ # The default values and their conditions
+ for value, cond in sym.defaults:
+ make_depend_on(sym, value)
+ make_depend_on(sym, cond)
+
+ # The reverse and weak reverse dependencies
+ make_depend_on(sym, sym.rev_dep)
+ make_depend_on(sym, sym.weak_rev_dep)
+
+ # The ranges along with their conditions
+ for low, high, cond in sym.ranges:
+ make_depend_on(sym, low)
+ make_depend_on(sym, high)
+ make_depend_on(sym, cond)
+
+ # The direct dependencies. This is usually redundant, as the direct
+ # dependencies get propagated to properties, but it's needed to get
+ # invalidation solid for 'imply', which only checks the direct
+ # dependencies (even if there are no properties to propagate it
+ # to).
+ make_depend_on(sym, sym.direct_dep)
+
+ # In addition to the above, choice symbols depend on the choice
+ # they're in, but that's handled automatically since the Choice is
+ # propagated to the conditions of the properties before
+ # _build_dep() runs.
+
+ for choice in self.unique_choices:
+ # Choices depend on the following:
+
+ # The prompt conditions
+ for node in choice.nodes:
+ if node.prompt:
+ make_depend_on(choice, node.prompt[1])
+
+ # The default symbol conditions
+ for _, cond in choice.defaults:
+ make_depend_on(choice, cond)
+
+ def _add_choice_deps(self):
+ # Choices also depend on the choice symbols themselves, because the
+ # y-mode selection of the choice might change if a choice symbol's
+ # visibility changes.
+ #
+ # We add these dependencies separately after dependency loop detection.
+ # The invalidation algorithm can handle the resulting
+ # <choice symbol> <-> <choice> dependency loops, but they make loop
+ # detection awkward.
+
+ for choice in self.unique_choices:
+ for sym in choice.syms:
+ sym._dependents.add(choice)
+
+ def _invalidate_all(self):
+ # Undefined symbols never change value and don't need to be
+ # invalidated, so we can just iterate over defined symbols.
+ # Invalidating constant symbols would break things horribly.
+ for sym in self.unique_defined_syms:
+ sym._invalidate()
+
+ for choice in self.unique_choices:
+ choice._invalidate()
+
+ #
+ # Post-parsing menu tree processing, including dependency propagation and
+ # implicit submenu creation
+ #
+
+ def _finalize_node(self, node, visible_if):
+ # Finalizes a menu node and its children:
+ #
+ # - Copies properties from menu nodes up to their contained
+ # symbols/choices
+ #
+ # - Propagates dependencies from parent to child nodes
+ #
+ # - Creates implicit menus (see kconfig-language.txt)
+ #
+ # - Removes 'if' nodes
+ #
+ # - Sets 'choice' types and registers choice symbols
+ #
+ # menu_finalize() in the C implementation is similar.
+ #
+ # node:
+ # The menu node to finalize. This node and its children will have
+ # been finalized when the function returns, and any implicit menus
+ # will have been created.
+ #
+ # visible_if:
+ # Dependencies from 'visible if' on parent menus. These are added to
+ # the prompts of symbols and choices.
+
+ if node.item.__class__ is Symbol:
+ # Copy defaults, ranges, selects, and implies to the Symbol
+ self._add_props_to_sym(node)
+
+ # Find any items that should go in an implicit menu rooted at the
+ # symbol
+ cur = node
+ while cur.next and _auto_menu_dep(node, cur.next):
+ # This makes implicit submenu creation work recursively, with
+ # implicit menus inside implicit menus
+ self._finalize_node(cur.next, visible_if)
+ cur = cur.next
+ cur.parent = node
+
+ if cur is not node:
+ # Found symbols that should go in an implicit submenu. Tilt
+ # them up above us.
+ node.list = node.next
+ node.next = cur.next
+ cur.next = None
+
+ elif node.list:
+ # The menu node is a choice, menu, or if. Finalize each child node.
+
+ if node.item is MENU:
+ visible_if = self._make_and(visible_if, node.visibility)
+
+ # Propagate the menu node's dependencies to each child menu node.
+ #
+ # This needs to go before the recursive _finalize_node() call so
+ # that implicit submenu creation can look ahead at dependencies.
+ self._propagate_deps(node, visible_if)
+
+ # Finalize the children
+ cur = node.list
+ while cur:
+ self._finalize_node(cur, visible_if)
+ cur = cur.next
+
+ if node.list:
+ # node's children have been individually finalized. Do final steps
+ # to finalize this "level" in the menu tree.
+ _flatten(node.list)
+ _remove_ifs(node)
+
+ # Empty choices (node.list None) are possible, so this needs to go
+ # outside
+ if node.item.__class__ is Choice:
+ # Add the node's non-node-specific properties to the choice, like
+ # _add_props_to_sym() does
+ choice = node.item
+ choice.direct_dep = self._make_or(choice.direct_dep, node.dep)
+ choice.defaults += node.defaults
+
+ _finalize_choice(node)
+
+ def _propagate_deps(self, node, visible_if):
+ # Propagates 'node's dependencies to its child menu nodes
+
+ # If the parent node holds a Choice, we use the Choice itself as the
+ # parent dependency. This makes sense as the value (mode) of the choice
+ # limits the visibility of the contained choice symbols. The C
+ # implementation works the same way.
+ #
+ # Due to the similar interface, Choice works as a drop-in replacement
+ # for Symbol here.
+ basedep = node.item if node.item.__class__ is Choice else node.dep
+
+ cur = node.list
+ while cur:
+ dep = cur.dep = self._make_and(cur.dep, basedep)
+
+ if cur.item.__class__ in _SYMBOL_CHOICE:
+ # Propagate 'visible if' and dependencies to the prompt
+ if cur.prompt:
+ cur.prompt = (cur.prompt[0],
+ self._make_and(
+ cur.prompt[1],
+ self._make_and(visible_if, dep)))
+
+ # Propagate dependencies to defaults
+ if cur.defaults:
+ cur.defaults = [(default, self._make_and(cond, dep))
+ for default, cond in cur.defaults]
+
+ # Propagate dependencies to ranges
+ if cur.ranges:
+ cur.ranges = [(low, high, self._make_and(cond, dep))
+ for low, high, cond in cur.ranges]
+
+ # Propagate dependencies to selects
+ if cur.selects:
+ cur.selects = [(target, self._make_and(cond, dep))
+ for target, cond in cur.selects]
+
+ # Propagate dependencies to implies
+ if cur.implies:
+ cur.implies = [(target, self._make_and(cond, dep))
+ for target, cond in cur.implies]
+
+ elif cur.prompt: # Not a symbol/choice
+ # Propagate dependencies to the prompt. 'visible if' is only
+ # propagated to symbols/choices.
+ cur.prompt = (cur.prompt[0],
+ self._make_and(cur.prompt[1], dep))
+
+ cur = cur.next
+
+ def _add_props_to_sym(self, node):
+ # Copies properties from the menu node 'node' up to its contained
+ # symbol, and adds (weak) reverse dependencies to selected/implied
+ # symbols.
+ #
+ # This can't be rolled into _propagate_deps(), because that function
+ # traverses the menu tree roughly breadth-first, meaning properties on
+ # symbols defined in multiple locations could end up in the wrong
+ # order.
+
+ sym = node.item
+
+ # See the Symbol class docstring
+ sym.direct_dep = self._make_or(sym.direct_dep, node.dep)
+
+ sym.defaults += node.defaults
+ sym.ranges += node.ranges
+ sym.selects += node.selects
+ sym.implies += node.implies
+
+ # Modify the reverse dependencies of the selected symbol
+ for target, cond in node.selects:
+ target.rev_dep = self._make_or(
+ target.rev_dep,
+ self._make_and(sym, cond))
+
+ # Modify the weak reverse dependencies of the implied
+ # symbol
+ for target, cond in node.implies:
+ target.weak_rev_dep = self._make_or(
+ target.weak_rev_dep,
+ self._make_and(sym, cond))
+
+ #
+ # Misc.
+ #
+
+ def _check_sym_sanity(self):
+ # Checks various symbol properties that are handiest to check after
+ # parsing. Only generates errors and warnings.
+
+ def num_ok(sym, type_):
+ # Returns True if the (possibly constant) symbol 'sym' is valid as a value
+ # for a symbol of type type_ (INT or HEX)
+
+ # 'not sym.nodes' implies a constant or undefined symbol, e.g. a plain
+ # "123"
+ if not sym.nodes:
+ return _is_base_n(sym.name, _TYPE_TO_BASE[type_])
+
+ return sym.orig_type is type_
+
+ for sym in self.unique_defined_syms:
+ if sym.orig_type in _BOOL_TRISTATE:
+ # A helper function could be factored out here, but keep it
+ # speedy/straightforward
+
+ for target_sym, _ in sym.selects:
+ if target_sym.orig_type not in _BOOL_TRISTATE_UNKNOWN:
+ self._warn("{} selects the {} symbol {}, which is not "
+ "bool or tristate"
+ .format(_name_and_loc(sym),
+ TYPE_TO_STR[target_sym.orig_type],
+ _name_and_loc(target_sym)))
+
+ for target_sym, _ in sym.implies:
+ if target_sym.orig_type not in _BOOL_TRISTATE_UNKNOWN:
+ self._warn("{} implies the {} symbol {}, which is not "
+ "bool or tristate"
+ .format(_name_and_loc(sym),
+ TYPE_TO_STR[target_sym.orig_type],
+ _name_and_loc(target_sym)))
+
+ elif sym.orig_type: # STRING/INT/HEX
+ for default, _ in sym.defaults:
+ if default.__class__ is not Symbol:
+ raise KconfigError(
+ "the {} symbol {} has a malformed default {} -- expected "
+ "a single symbol"
+ .format(TYPE_TO_STR[sym.orig_type], _name_and_loc(sym),
+ expr_str(default)))
+
+ if sym.orig_type is STRING:
+ if not default.is_constant and not default.nodes and \
+ not default.name.isupper():
+ # 'default foo' on a string symbol could be either a symbol
+ # reference or someone leaving out the quotes. Guess that
+ # the quotes were left out if 'foo' isn't all-uppercase
+ # (and no symbol named 'foo' exists).
+ self._warn("style: quotes recommended around "
+ "default value for string symbol "
+ + _name_and_loc(sym))
+
+ elif not num_ok(default, sym.orig_type): # INT/HEX
+ self._warn("the {0} symbol {1} has a non-{0} default {2}"
+ .format(TYPE_TO_STR[sym.orig_type],
+ _name_and_loc(sym),
+ _name_and_loc(default)))
+
+ if sym.selects or sym.implies:
+ self._warn("the {} symbol {} has selects or implies"
+ .format(TYPE_TO_STR[sym.orig_type],
+ _name_and_loc(sym)))
+
+ else: # UNKNOWN
+ self._warn("{} defined without a type"
+ .format(_name_and_loc(sym)))
+
+
+ if sym.ranges:
+ if sym.orig_type not in _INT_HEX:
+ self._warn(
+ "the {} symbol {} has ranges, but is not int or hex"
+ .format(TYPE_TO_STR[sym.orig_type],
+ _name_and_loc(sym)))
+ else:
+ for low, high, _ in sym.ranges:
+ if not num_ok(low, sym.orig_type) or \
+ not num_ok(high, sym.orig_type):
+
+ self._warn("the {0} symbol {1} has a non-{0} "
+ "range [{2}, {3}]"
+ .format(TYPE_TO_STR[sym.orig_type],
+ _name_and_loc(sym),
+ _name_and_loc(low),
+ _name_and_loc(high)))
+
+ def _check_choice_sanity(self):
+ # Checks various choice properties that are handiest to check after
+ # parsing. Only generates errors and warnings.
+
+ def warn_select_imply(sym, expr, expr_type):
+ msg = "the choice symbol {} is {} by the following symbols, but " \
+ "select/imply has no effect on choice symbols" \
+ .format(_name_and_loc(sym), expr_type)
+
+ # si = select/imply
+ for si in split_expr(expr, OR):
+ msg += "\n - " + _name_and_loc(split_expr(si, AND)[0])
+
+ self._warn(msg)
+
+ for choice in self.unique_choices:
+ if choice.orig_type not in _BOOL_TRISTATE:
+ self._warn("{} defined with type {}"
+ .format(_name_and_loc(choice),
+ TYPE_TO_STR[choice.orig_type]))
+
+ for node in choice.nodes:
+ if node.prompt:
+ break
+ else:
+ self._warn(_name_and_loc(choice) + " defined without a prompt")
+
+ for default, _ in choice.defaults:
+ if default.__class__ is not Symbol:
+ raise KconfigError(
+ "{} has a malformed default {}"
+ .format(_name_and_loc(choice), expr_str(default)))
+
+ if default.choice is not choice:
+ self._warn("the default selection {} of {} is not "
+ "contained in the choice"
+ .format(_name_and_loc(default),
+ _name_and_loc(choice)))
+
+ for sym in choice.syms:
+ if sym.defaults:
+ self._warn("default on the choice symbol {} will have "
+ "no effect, as defaults do not affect choice "
+ "symbols".format(_name_and_loc(sym)))
+
+ if sym.rev_dep is not sym.kconfig.n:
+ warn_select_imply(sym, sym.rev_dep, "selected")
+
+ if sym.weak_rev_dep is not sym.kconfig.n:
+ warn_select_imply(sym, sym.weak_rev_dep, "implied")
+
+ for node in sym.nodes:
+ if node.parent.item is choice:
+ if not node.prompt:
+ self._warn("the choice symbol {} has no prompt"
+ .format(_name_and_loc(sym)))
+
+ elif node.prompt:
+ self._warn("the choice symbol {} is defined with a "
+ "prompt outside the choice"
+ .format(_name_and_loc(sym)))
+
+ def _parse_error(self, msg):
+ raise KconfigError("{}couldn't parse '{}': {}".format(
+ "" if self.filename is None else
+ "{}:{}: ".format(self.filename, self.linenr),
+ self._line.strip(), msg))
+
+ def _trailing_tokens_error(self):
+ self._parse_error("extra tokens at end of line")
+
+ def _open(self, filename, mode):
+ # open() wrapper:
+ #
+ # - Enable universal newlines mode on Python 2 to ease
+ # interoperability between Linux and Windows. It's already the
+ # default on Python 3.
+ #
+ # The "U" flag would currently work for both Python 2 and 3, but it's
+ # deprecated on Python 3, so play it future-safe.
+ #
+ # io.open() defaults to universal newlines on Python 2 (and is an
+ # alias for open() on Python 3), but it returns 'unicode' strings and
+ # slows things down:
+ #
+ # Parsing x86 Kconfigs on Python 2
+ #
+ # with open(..., "rU"):
+ #
+ # real 0m0.930s
+ # user 0m0.905s
+ # sys 0m0.025s
+ #
+ # with io.open():
+ #
+ # real 0m1.069s
+ # user 0m1.040s
+ # sys 0m0.029s
+ #
+ # There's no appreciable performance difference between "r" and
+ # "rU" for parsing performance on Python 2.
+ #
+ # - For Python 3, force the encoding. Forcing the encoding on Python 2
+ # turns strings into Unicode strings, which gets messy. Python 2
+ # doesn't decode regular strings anyway.
+ return open(filename, "rU" if mode == "r" else mode) if _IS_PY2 else \
+ open(filename, mode, encoding=self._encoding)
+
+ def _check_undef_syms(self):
+ # Prints warnings for all references to undefined symbols within the
+ # Kconfig files
+
+ def is_num(s):
+ # Returns True if the string 's' looks like a number.
+ #
+ # Internally, all operands in Kconfig are symbols, only undefined symbols
+ # (which numbers usually are) get their name as their value.
+ #
+ # Only hex numbers that start with 0x/0X are classified as numbers.
+ # Otherwise, symbols whose names happen to contain only the letters A-F
+ # would trigger false positives.
+
+ try:
+ int(s)
+ except ValueError:
+ if not s.startswith(("0x", "0X")):
+ return False
+
+ try:
+ int(s, 16)
+ except ValueError:
+ return False
+
+ return True
+
+ for sym in (self.syms.viewvalues if _IS_PY2 else self.syms.values)():
+ # - sym.nodes empty means the symbol is undefined (has no
+ # definition locations)
+ #
+ # - Due to Kconfig internals, numbers show up as undefined Kconfig
+ # symbols, but shouldn't be flagged
+ #
+ # - The MODULES symbol always exists
+ if not sym.nodes and not is_num(sym.name) and \
+ sym.name != "MODULES":
+
+ msg = "undefined symbol {}:".format(sym.name)
+ for node in self.node_iter():
+ if sym in node.referenced:
+ msg += "\n\n- Referenced at {}:{}:\n\n{}" \
+ .format(node.filename, node.linenr, node)
+ self._warn(msg)
+
+ def _warn(self, msg, filename=None, linenr=None):
+ # For printing general warnings
+
+ if not self.warn:
+ return
+
+ msg = "warning: " + msg
+ if filename is not None:
+ msg = "{}:{}: {}".format(filename, linenr, msg)
+
+ self.warnings.append(msg)
+ if self.warn_to_stderr:
+ sys.stderr.write(msg + "\n")
+
+
+class Symbol(object):
+ """
+ Represents a configuration symbol:
+
+ (menu)config FOO
+ ...
+
+ The following attributes are available. They should be viewed as read-only,
+ and some are implemented through @property magic (but are still efficient
+ to access due to internal caching).
+
+ Note: Prompts, help texts, and locations are stored in the Symbol's
+ MenuNode(s) rather than in the Symbol itself. Check the MenuNode class and
+ the Symbol.nodes attribute. This organization matches the C tools.
+
+ name:
+ The name of the symbol, e.g. "FOO" for 'config FOO'.
+
+ type:
+ The type of the symbol. One of BOOL, TRISTATE, STRING, INT, HEX, UNKNOWN.
+ UNKNOWN is for undefined symbols, (non-special) constant symbols, and
+ symbols defined without a type.
+
+ When running without modules (MODULES having the value n), TRISTATE
+ symbols magically change type to BOOL. This also happens for symbols
+ within choices in "y" mode. This matches the C tools, and makes sense for
+ menuconfig-like functionality.
+
+ orig_type:
+ The type as given in the Kconfig file, without any magic applied. Used
+ when printing the symbol.
+
+ str_value:
+ The value of the symbol as a string. Gives the value for string/int/hex
+ symbols. For bool/tristate symbols, gives "n", "m", or "y".
+
+ This is the symbol value that's used in relational expressions
+ (A = B, A != B, etc.)
+
+ Gotcha: For int/hex symbols, the exact format of the value must often be
+ preserved (e.g., when writing a .config file), hence why you can't get it
+ directly as an int. Do int(int_sym.str_value) or
+ int(hex_sym.str_value, 16) to get the integer value.
+
+ tri_value:
+ The tristate value of the symbol as an integer. One of 0, 1, 2,
+ representing n, m, y. Always 0 (n) for non-bool/tristate symbols.
+
+ This is the symbol value that's used outside of relation expressions
+ (A, !A, A && B, A || B).
+
+ assignable:
+ A tuple containing the tristate user values that can currently be
+ assigned to the symbol (that would be respected), ordered from lowest (0,
+ representing n) to highest (2, representing y). This corresponds to the
+ selections available in the menuconfig interface. The set of assignable
+ values is calculated from the symbol's visibility and selects/implies.
+
+ Returns the empty set for non-bool/tristate symbols and for symbols with
+ visibility n. The other possible values are (0, 2), (0, 1, 2), (1, 2),
+ (1,), and (2,). A (1,) or (2,) result means the symbol is visible but
+ "locked" to m or y through a select, perhaps in combination with the
+ visibility. menuconfig represents this as -M- and -*-, respectively.
+
+ For string/hex/int symbols, check if Symbol.visibility is non-0 (non-n)
+ instead to determine if the value can be changed.
+
+ Some handy 'assignable' idioms:
+
+ # Is 'sym' an assignable (visible) bool/tristate symbol?
+ if sym.assignable:
+ # What's the highest value it can be assigned? [-1] in Python
+ # gives the last element.
+ sym_high = sym.assignable[-1]
+
+ # The lowest?
+ sym_low = sym.assignable[0]
+
+ # Can the symbol be set to at least m?
+ if sym.assignable[-1] >= 1:
+ ...
+
+ # Can the symbol be set to m?
+ if 1 in sym.assignable:
+ ...
+
+ visibility:
+ The visibility of the symbol. One of 0, 1, 2, representing n, m, y. See
+ the module documentation for an overview of symbol values and visibility.
+
+ user_value:
+ The user value of the symbol. None if no user value has been assigned
+ (via Kconfig.load_config() or Symbol.set_value()).
+
+ Holds 0, 1, or 2 for bool/tristate symbols, and a string for the other
+ symbol types.
+
+ WARNING: Do not assign directly to this. It will break things. Use
+ Symbol.set_value().
+
+ config_string:
+ The .config assignment string that would get written out for the symbol
+ by Kconfig.write_config(). Returns the empty string if no .config
+ assignment would get written out.
+
+ In general, visible symbols, symbols with (active) defaults, and selected
+ symbols get written out. This includes all non-n-valued bool/tristate
+ symbols, and all visible string/int/hex symbols.
+
+ Symbols with the (no longer needed) 'option env=...' option generate no
+ configuration output, and neither does the special
+ 'option defconfig_list' symbol.
+
+ Tip: This field is useful when generating custom configuration output,
+ even for non-.config-like formats. To write just the symbols that would
+ get written out to .config files, do this:
+
+ if sym.config_string:
+ *Write symbol, e.g. by looking sym.str_value*
+
+ This is a superset of the symbols written out by write_autoconf().
+ That function skips all n-valued symbols.
+
+ There usually won't be any great harm in just writing all symbols either,
+ though you might get some special symbols and possibly some "redundant"
+ n-valued symbol entries in there.
+
+ nodes:
+ A list of MenuNodes for this symbol. Will contain a single MenuNode for
+ most symbols. Undefined and constant symbols have an empty nodes list.
+ Symbols defined in multiple locations get one node for each location.
+
+ choice:
+ Holds the parent Choice for choice symbols, and None for non-choice
+ symbols. Doubles as a flag for whether a symbol is a choice symbol.
+
+ defaults:
+ List of (default, cond) tuples for the symbol's 'default' properties. For
+ example, 'default A && B if C || D' is represented as
+ ((AND, A, B), (OR, C, D)). If no condition was given, 'cond' is
+ self.kconfig.y.
+
+ Note that 'depends on' and parent dependencies are propagated to
+ 'default' conditions.
+
+ selects:
+ List of (symbol, cond) tuples for the symbol's 'select' properties. For
+ example, 'select A if B && C' is represented as (A, (AND, B, C)). If no
+ condition was given, 'cond' is self.kconfig.y.
+
+ Note that 'depends on' and parent dependencies are propagated to 'select'
+ conditions.
+
+ implies:
+ Like 'selects', for imply.
+
+ ranges:
+ List of (low, high, cond) tuples for the symbol's 'range' properties. For
+ example, 'range 1 2 if A' is represented as (1, 2, A). If there is no
+ condition, 'cond' is self.kconfig.y.
+
+ Note that 'depends on' and parent dependencies are propagated to 'range'
+ conditions.
+
+ Gotcha: 1 and 2 above will be represented as (undefined) Symbols rather
+ than plain integers. Undefined symbols get their name as their string
+ value, so this works out. The C tools work the same way.
+
+ orig_defaults:
+ orig_selects:
+ orig_implies:
+ orig_ranges:
+ See the corresponding attributes on the MenuNode class.
+
+ rev_dep:
+ Reverse dependency expression from other symbols selecting this symbol.
+ Multiple selections get ORed together. A condition on a select is ANDed
+ with the selecting symbol.
+
+ For example, if A has 'select FOO' and B has 'select FOO if C', then
+ FOO's rev_dep will be (OR, A, (AND, B, C)).
+
+ weak_rev_dep:
+ Like rev_dep, for imply.
+
+ direct_dep:
+ The direct ('depends on') dependencies for the symbol, or self.kconfig.y
+ if there are no direct dependencies.
+
+ This attribute includes any dependencies from surrounding menus and ifs.
+ Those get propagated to the direct dependencies, and the resulting direct
+ dependencies in turn get propagated to the conditions of all properties.
+
+ If the symbol is defined in multiple locations, the dependencies from the
+ different locations get ORed together.
+
+ referenced:
+ A set() with all symbols and choices referenced in the properties and
+ property conditions of the symbol.
+
+ Also includes dependencies from surrounding menus and ifs, because those
+ get propagated to the symbol (see the 'Intro to symbol values' section in
+ the module docstring).
+
+ Choices appear in the dependencies of choice symbols.
+
+ For the following definitions, only B and not C appears in A's
+ 'referenced'. To get transitive references, you'll have to recursively
+ expand 'references' until no new items appear.
+
+ config A
+ bool
+ depends on B
+
+ config B
+ bool
+ depends on C
+
+ config C
+ bool
+
+ See the Symbol.direct_dep attribute if you're only interested in the
+ direct dependencies of the symbol (its 'depends on'). You can extract the
+ symbols in it with the global expr_items() function.
+
+ env_var:
+ If the Symbol has an 'option env="FOO"' option, this contains the name
+ ("FOO") of the environment variable. None for symbols without no
+ 'option env'.
+
+ 'option env="FOO"' acts like a 'default' property whose value is the
+ value of $FOO.
+
+ Symbols with 'option env' are never written out to .config files, even if
+ they are visible. env_var corresponds to a flag called SYMBOL_AUTO in the
+ C implementation.
+
+ is_allnoconfig_y:
+ True if the symbol has 'option allnoconfig_y' set on it. This has no
+ effect internally (except when printing symbols), but can be checked by
+ scripts.
+
+ is_constant:
+ True if the symbol is a constant (quoted) symbol.
+
+ kconfig:
+ The Kconfig instance this symbol is from.
+ """
+ __slots__ = (
+ "_cached_assignable",
+ "_cached_str_val",
+ "_cached_tri_val",
+ "_cached_vis",
+ "_dependents",
+ "_old_val",
+ "_visited",
+ "_was_set",
+ "_write_to_conf",
+ "choice",
+ "defaults",
+ "direct_dep",
+ "env_var",
+ "implies",
+ "is_allnoconfig_y",
+ "is_constant",
+ "kconfig",
+ "name",
+ "nodes",
+ "orig_type",
+ "ranges",
+ "rev_dep",
+ "selects",
+ "user_value",
+ "weak_rev_dep",
+ )
+
+ #
+ # Public interface
+ #
+
+ @property
+ def type(self):
+ """
+ See the class documentation.
+ """
+ if self.orig_type is TRISTATE and \
+ (self.choice and self.choice.tri_value == 2 or
+ not self.kconfig.modules.tri_value):
+
+ return BOOL
+
+ return self.orig_type
+
+ @property
+ def str_value(self):
+ """
+ See the class documentation.
+ """
+ if self._cached_str_val is not None:
+ return self._cached_str_val
+
+ if self.orig_type in _BOOL_TRISTATE:
+ # Also calculates the visibility, so invalidation safe
+ self._cached_str_val = TRI_TO_STR[self.tri_value]
+ return self._cached_str_val
+
+ # As a quirk of Kconfig, undefined symbols get their name as their
+ # string value. This is why things like "FOO = bar" work for seeing if
+ # FOO has the value "bar".
+ if not self.orig_type: # UNKNOWN
+ self._cached_str_val = self.name
+ return self.name
+
+ val = ""
+ # Warning: See Symbol._rec_invalidate(), and note that this is a hidden
+ # function call (property magic)
+ vis = self.visibility
+
+ self._write_to_conf = (vis != 0)
+
+ if self.orig_type in _INT_HEX:
+ # The C implementation checks the user value against the range in a
+ # separate code path (post-processing after loading a .config).
+ # Checking all values here instead makes more sense for us. It
+ # requires that we check for a range first.
+
+ base = _TYPE_TO_BASE[self.orig_type]
+
+ # Check if a range is in effect
+ for low_expr, high_expr, cond in self.ranges:
+ if expr_value(cond):
+ has_active_range = True
+
+ # The zeros are from the C implementation running strtoll()
+ # on empty strings
+ low = int(low_expr.str_value, base) if \
+ _is_base_n(low_expr.str_value, base) else 0
+ high = int(high_expr.str_value, base) if \
+ _is_base_n(high_expr.str_value, base) else 0
+
+ break
+ else:
+ has_active_range = False
+
+ # Defaults are used if the symbol is invisible, lacks a user value,
+ # or has an out-of-range user value
+ use_defaults = True
+
+ if vis and self.user_value:
+ user_val = int(self.user_value, base)
+ if has_active_range and not low <= user_val <= high:
+ num2str = str if base == 10 else hex
+ self.kconfig._warn(
+ "user value {} on the {} symbol {} ignored due to "
+ "being outside the active range ([{}, {}]) -- falling "
+ "back on defaults"
+ .format(num2str(user_val), TYPE_TO_STR[self.orig_type],
+ _name_and_loc(self),
+ num2str(low), num2str(high)))
+ else:
+ # If the user value is well-formed and satisfies range
+ # contraints, it is stored in exactly the same form as
+ # specified in the assignment (with or without "0x", etc.)
+ val = self.user_value
+ use_defaults = False
+
+ if use_defaults:
+ # No user value or invalid user value. Look at defaults.
+
+ # Used to implement the warning below
+ has_default = False
+
+ for sym, cond in self.defaults:
+ if expr_value(cond):
+ has_default = self._write_to_conf = True
+
+ val = sym.str_value
+
+ if _is_base_n(val, base):
+ val_num = int(val, base)
+ else:
+ val_num = 0 # strtoll() on empty string
+
+ break
+ else:
+ val_num = 0 # strtoll() on empty string
+
+ # This clamping procedure runs even if there's no default
+ if has_active_range:
+ clamp = None
+ if val_num < low:
+ clamp = low
+ elif val_num > high:
+ clamp = high
+
+ if clamp is not None:
+ # The value is rewritten to a standard form if it is
+ # clamped
+ val = str(clamp) \
+ if self.orig_type is INT else \
+ hex(clamp)
+
+ if has_default:
+ num2str = str if base == 10 else hex
+ self.kconfig._warn(
+ "default value {} on {} clamped to {} due to "
+ "being outside the active range ([{}, {}])"
+ .format(val_num, _name_and_loc(self),
+ num2str(clamp), num2str(low),
+ num2str(high)))
+
+ elif self.orig_type is STRING:
+ if vis and self.user_value is not None:
+ # If the symbol is visible and has a user value, use that
+ val = self.user_value
+ else:
+ # Otherwise, look at defaults
+ for sym, cond in self.defaults:
+ if expr_value(cond):
+ val = sym.str_value
+ self._write_to_conf = True
+ break
+
+ # env_var corresponds to SYMBOL_AUTO in the C implementation, and is
+ # also set on the defconfig_list symbol there. Test for the
+ # defconfig_list symbol explicitly instead here, to avoid a nonsensical
+ # env_var setting and the defconfig_list symbol being printed
+ # incorrectly. This code is pretty cold anyway.
+ if self.env_var is not None or self is self.kconfig.defconfig_list:
+ self._write_to_conf = False
+
+ self._cached_str_val = val
+ return val
+
+ @property
+ def tri_value(self):
+ """
+ See the class documentation.
+ """
+ if self._cached_tri_val is not None:
+ return self._cached_tri_val
+
+ if self.orig_type not in _BOOL_TRISTATE:
+ if self.orig_type: # != UNKNOWN
+ # Would take some work to give the location here
+ self.kconfig._warn(
+ "The {} symbol {} is being evaluated in a logical context "
+ "somewhere. It will always evaluate to n."
+ .format(TYPE_TO_STR[self.orig_type], _name_and_loc(self)))
+
+ self._cached_tri_val = 0
+ return 0
+
+ # Warning: See Symbol._rec_invalidate(), and note that this is a hidden
+ # function call (property magic)
+ vis = self.visibility
+ self._write_to_conf = (vis != 0)
+
+ val = 0
+
+ if not self.choice:
+ # Non-choice symbol
+
+ if vis and self.user_value is not None:
+ # If the symbol is visible and has a user value, use that
+ val = min(self.user_value, vis)
+
+ else:
+ # Otherwise, look at defaults and weak reverse dependencies
+ # (implies)
+
+ for default, cond in self.defaults:
+ dep_val = expr_value(cond)
+ if dep_val:
+ val = min(expr_value(default), dep_val)
+ if val:
+ self._write_to_conf = True
+ break
+
+ # Weak reverse dependencies are only considered if our
+ # direct dependencies are met
+ dep_val = expr_value(self.weak_rev_dep)
+ if dep_val and expr_value(self.direct_dep):
+ val = max(dep_val, val)
+ self._write_to_conf = True
+
+ # Reverse (select-related) dependencies take precedence
+ dep_val = expr_value(self.rev_dep)
+ if dep_val:
+ if expr_value(self.direct_dep) < dep_val:
+ self._warn_select_unsatisfied_deps()
+
+ val = max(dep_val, val)
+ self._write_to_conf = True
+
+ # m is promoted to y for (1) bool symbols and (2) symbols with a
+ # weak_rev_dep (from imply) of y
+ if val == 1 and \
+ (self.type is BOOL or expr_value(self.weak_rev_dep) == 2):
+ val = 2
+
+ elif vis == 2:
+ # Visible choice symbol in y-mode choice. The choice mode limits
+ # the visibility of choice symbols, so it's sufficient to just
+ # check the visibility of the choice symbols themselves.
+ val = 2 if self.choice.selection is self else 0
+
+ elif vis and self.user_value:
+ # Visible choice symbol in m-mode choice, with set non-0 user value
+ val = 1
+
+ self._cached_tri_val = val
+ return val
+
+ @property
+ def assignable(self):
+ """
+ See the class documentation.
+ """
+ if self._cached_assignable is None:
+ self._cached_assignable = self._assignable()
+ return self._cached_assignable
+
+ @property
+ def visibility(self):
+ """
+ See the class documentation.
+ """
+ if self._cached_vis is None:
+ self._cached_vis = _visibility(self)
+ return self._cached_vis
+
+ @property
+ def config_string(self):
+ """
+ See the class documentation.
+ """
+ # _write_to_conf is determined when the value is calculated. This is a
+ # hidden function call due to property magic.
+ val = self.str_value
+ if not self._write_to_conf:
+ return ""
+
+ if self.orig_type in _BOOL_TRISTATE:
+ return "{}{}={}\n" \
+ .format(self.kconfig.config_prefix, self.name, val) \
+ if val != "n" else \
+ "# {}{} is not set\n" \
+ .format(self.kconfig.config_prefix, self.name)
+
+ if self.orig_type in _INT_HEX:
+ return "{}{}={}\n" \
+ .format(self.kconfig.config_prefix, self.name, val)
+
+ # sym.orig_type is STRING
+ return '{}{}="{}"\n' \
+ .format(self.kconfig.config_prefix, self.name, escape(val))
+
+ def set_value(self, value):
+ """
+ Sets the user value of the symbol.
+
+ Equal in effect to assigning the value to the symbol within a .config
+ file. For bool and tristate symbols, use the 'assignable' attribute to
+ check which values can currently be assigned. Setting values outside
+ 'assignable' will cause Symbol.user_value to differ from
+ Symbol.str/tri_value (be truncated down or up).
+
+ Setting a choice symbol to 2 (y) sets Choice.user_selection to the
+ choice symbol in addition to setting Symbol.user_value.
+ Choice.user_selection is considered when the choice is in y mode (the
+ "normal" mode).
+
+ Other symbols that depend (possibly indirectly) on this symbol are
+ automatically recalculated to reflect the assigned value.
+
+ value:
+ The user value to give to the symbol. For bool and tristate symbols,
+ n/m/y can be specified either as 0/1/2 (the usual format for tristate
+ values in Kconfiglib) or as one of the strings "n"/"m"/"y". For other
+ symbol types, pass a string.
+
+ Note that the value for an int/hex symbol is passed as a string, e.g.
+ "123" or "0x0123". The format of this string is preserved in the
+ output.
+
+ Values that are invalid for the type (such as "foo" or 1 (m) for a
+ BOOL or "0x123" for an INT) are ignored and won't be stored in
+ Symbol.user_value. Kconfiglib will print a warning by default for
+ invalid assignments, and set_value() will return False.
+
+ Returns True if the value is valid for the type of the symbol, and
+ False otherwise. This only looks at the form of the value. For BOOL and
+ TRISTATE symbols, check the Symbol.assignable attribute to see what
+ values are currently in range and would actually be reflected in the
+ value of the symbol. For other symbol types, check whether the
+ visibility is non-n.
+ """
+ if self.orig_type in _BOOL_TRISTATE and value in STR_TO_TRI:
+ value = STR_TO_TRI[value]
+
+ # If the new user value matches the old, nothing changes, and we can
+ # avoid invalidating cached values.
+ #
+ # This optimization is skipped for choice symbols: Setting a choice
+ # symbol's user value to y might change the state of the choice, so it
+ # wouldn't be safe (symbol user values always match the values set in a
+ # .config file or via set_value(), and are never implicitly updated).
+ if value == self.user_value and not self.choice:
+ self._was_set = True
+ return True
+
+ # Check if the value is valid for our type
+ if not (self.orig_type is BOOL and value in (2, 0) or
+ self.orig_type is TRISTATE and value in TRI_TO_STR or
+ value.__class__ is str and
+ (self.orig_type is STRING or
+ self.orig_type is INT and _is_base_n(value, 10) or
+ self.orig_type is HEX and _is_base_n(value, 16)
+ and int(value, 16) >= 0)):
+
+ # Display tristate values as n, m, y in the warning
+ self.kconfig._warn(
+ "the value {} is invalid for {}, which has type {} -- "
+ "assignment ignored"
+ .format(TRI_TO_STR[value] if value in TRI_TO_STR else
+ "'{}'".format(value),
+ _name_and_loc(self), TYPE_TO_STR[self.orig_type]))
+
+ return False
+
+ self.user_value = value
+ self._was_set = True
+
+ if self.choice and value == 2:
+ # Setting a choice symbol to y makes it the user selection of the
+ # choice. Like for symbol user values, the user selection is not
+ # guaranteed to match the actual selection of the choice, as
+ # dependencies come into play.
+ self.choice.user_selection = self
+ self.choice._was_set = True
+ self.choice._rec_invalidate()
+ else:
+ self._rec_invalidate_if_has_prompt()
+
+ return True
+
+ def unset_value(self):
+ """
+ Removes any user value from the symbol, as if the symbol had never
+ gotten a user value via Kconfig.load_config() or Symbol.set_value().
+ """
+ if self.user_value is not None:
+ self.user_value = None
+ self._rec_invalidate_if_has_prompt()
+
+ @property
+ def referenced(self):
+ """
+ See the class documentation.
+ """
+ return {item for node in self.nodes for item in node.referenced}
+
+ @property
+ def orig_defaults(self):
+ """
+ See the class documentation.
+ """
+ return [d for node in self.nodes for d in node.orig_defaults]
+
+ @property
+ def orig_selects(self):
+ """
+ See the class documentation.
+ """
+ return [s for node in self.nodes for s in node.orig_selects]
+
+ @property
+ def orig_implies(self):
+ """
+ See the class documentation.
+ """
+ return [i for node in self.nodes for i in node.orig_implies]
+
+ @property
+ def orig_ranges(self):
+ """
+ See the class documentation.
+ """
+ return [r for node in self.nodes for r in node.orig_ranges]
+
+ def __repr__(self):
+ """
+ Returns a string with information about the symbol (including its name,
+ value, visibility, and location(s)) when it is evaluated on e.g. the
+ interactive Python prompt.
+ """
+ fields = ["symbol " + self.name, TYPE_TO_STR[self.type]]
+ add = fields.append
+
+ for node in self.nodes:
+ if node.prompt:
+ add('"{}"'.format(node.prompt[0]))
+
+ # Only add quotes for non-bool/tristate symbols
+ add("value " + (self.str_value if self.orig_type in _BOOL_TRISTATE
+ else '"{}"'.format(self.str_value)))
+
+ if not self.is_constant:
+ # These aren't helpful to show for constant symbols
+
+ if self.user_value is not None:
+ # Only add quotes for non-bool/tristate symbols
+ add("user value " + (TRI_TO_STR[self.user_value]
+ if self.orig_type in _BOOL_TRISTATE
+ else '"{}"'.format(self.user_value)))
+
+ add("visibility " + TRI_TO_STR[self.visibility])
+
+ if self.choice:
+ add("choice symbol")
+
+ if self.is_allnoconfig_y:
+ add("allnoconfig_y")
+
+ if self is self.kconfig.defconfig_list:
+ add("is the defconfig_list symbol")
+
+ if self.env_var is not None:
+ add("from environment variable " + self.env_var)
+
+ if self is self.kconfig.modules:
+ add("is the modules symbol")
+
+ add("direct deps " + TRI_TO_STR[expr_value(self.direct_dep)])
+
+ if self.nodes:
+ for node in self.nodes:
+ add("{}:{}".format(node.filename, node.linenr))
+ else:
+ add("constant" if self.is_constant else "undefined")
+
+ return "<{}>".format(", ".join(fields))
+
+ def __str__(self):
+ """
+ Returns a string representation of the symbol when it is printed.
+ Matches the Kconfig format, with any parent dependencies propagated to
+ the 'depends on' condition.
+
+ The string is constructed by joining the strings returned by
+ MenuNode.__str__() for each of the symbol's menu nodes, so symbols
+ defined in multiple locations will return a string with all
+ definitions.
+
+ The returned string does not end in a newline. An empty string is
+ returned for undefined and constant symbols.
+ """
+ return self.custom_str(standard_sc_expr_str)
+
+ def custom_str(self, sc_expr_str_fn):
+ """
+ Works like Symbol.__str__(), but allows a custom format to be used for
+ all symbol/choice references. See expr_str().
+ """
+ return "\n\n".join(node.custom_str(sc_expr_str_fn)
+ for node in self.nodes)
+
+ #
+ # Private methods
+ #
+
+ def __init__(self):
+ """
+ Symbol constructor -- not intended to be called directly by Kconfiglib
+ clients.
+ """
+ # These attributes are always set on the instance from outside and
+ # don't need defaults:
+ # kconfig
+ # direct_dep
+ # is_constant
+ # name
+ # rev_dep
+ # weak_rev_dep
+
+ # - UNKNOWN == 0
+ # - _visited is used during tree iteration and dep. loop detection
+ self.orig_type = self._visited = 0
+
+ self.nodes = []
+
+ self.defaults = []
+ self.selects = []
+ self.implies = []
+ self.ranges = []
+
+ self.user_value = \
+ self.choice = \
+ self.env_var = \
+ self._cached_str_val = self._cached_tri_val = self._cached_vis = \
+ self._cached_assignable = None
+
+ # _write_to_conf is calculated along with the value. If True, the
+ # Symbol gets a .config entry.
+
+ self.is_allnoconfig_y = \
+ self._was_set = \
+ self._write_to_conf = False
+
+ # See Kconfig._build_dep()
+ self._dependents = set()
+
+ def _assignable(self):
+ # Worker function for the 'assignable' attribute
+
+ if self.orig_type not in _BOOL_TRISTATE:
+ return ()
+
+ # Warning: See Symbol._rec_invalidate(), and note that this is a hidden
+ # function call (property magic)
+ vis = self.visibility
+ if not vis:
+ return ()
+
+ rev_dep_val = expr_value(self.rev_dep)
+
+ if vis == 2:
+ if self.choice:
+ return (2,)
+
+ if not rev_dep_val:
+ if self.type is BOOL or expr_value(self.weak_rev_dep) == 2:
+ return (0, 2)
+ return (0, 1, 2)
+
+ if rev_dep_val == 2:
+ return (2,)
+
+ # rev_dep_val == 1
+
+ if self.type is BOOL or expr_value(self.weak_rev_dep) == 2:
+ return (2,)
+ return (1, 2)
+
+ # vis == 1
+
+ # Must be a tristate here, because bool m visibility gets promoted to y
+
+ if not rev_dep_val:
+ return (0, 1) if expr_value(self.weak_rev_dep) != 2 else (0, 2)
+
+ if rev_dep_val == 2:
+ return (2,)
+
+ # vis == rev_dep_val == 1
+
+ return (1,)
+
+ def _invalidate(self):
+ # Marks the symbol as needing to be recalculated
+
+ self._cached_str_val = self._cached_tri_val = self._cached_vis = \
+ self._cached_assignable = None
+
+ def _rec_invalidate(self):
+ # Invalidates the symbol and all items that (possibly) depend on it
+
+ if self is self.kconfig.modules:
+ # Invalidating MODULES has wide-ranging effects
+ self.kconfig._invalidate_all()
+ else:
+ self._invalidate()
+
+ for item in self._dependents:
+ # _cached_vis doubles as a flag that tells us whether 'item'
+ # has cached values, because it's calculated as a side effect
+ # of calculating all other (non-constant) cached values.
+ #
+ # If item._cached_vis is None, it means there can't be cached
+ # values on other items that depend on 'item', because if there
+ # were, some value on 'item' would have been calculated and
+ # item._cached_vis set as a side effect. It's therefore safe to
+ # stop the invalidation at symbols with _cached_vis None.
+ #
+ # This approach massively speeds up scripts that set a lot of
+ # values, vs simply invalidating all possibly dependent symbols
+ # (even when you already have a list of all the dependent
+ # symbols, because some symbols get huge dependency trees).
+ #
+ # This gracefully handles dependency loops too, which is nice
+ # for choices, where the choice depends on the choice symbols
+ # and vice versa.
+ if item._cached_vis is not None:
+ item._rec_invalidate()
+
+ def _rec_invalidate_if_has_prompt(self):
+ # Invalidates the symbol and its dependent symbols, but only if the
+ # symbol has a prompt. User values never have an effect on promptless
+ # symbols, so we skip invalidation for them as an optimization.
+ #
+ # This also prevents constant (quoted) symbols from being invalidated
+ # if set_value() is called on them, which would make them lose their
+ # value and break things.
+ #
+ # Prints a warning if the symbol has no prompt. In some contexts (e.g.
+ # when loading a .config files) assignments to promptless symbols are
+ # normal and expected, so the warning can be disabled.
+
+ for node in self.nodes:
+ if node.prompt:
+ self._rec_invalidate()
+ return
+
+ if self.kconfig._warn_assign_no_prompt:
+ self.kconfig._warn(_name_and_loc(self) + " has no prompt, meaning "
+ "user values have no effect on it")
+
+ def _str_default(self):
+ # write_min_config() helper function. Returns the value the symbol
+ # would get from defaults if it didn't have a user value. Uses exactly
+ # the same algorithm as the C implementation (though a bit cleaned up),
+ # for compatibility.
+
+ if self.orig_type in _BOOL_TRISTATE:
+ val = 0
+
+ # Defaults, selects, and implies do not affect choice symbols
+ if not self.choice:
+ for default, cond in self.defaults:
+ cond_val = expr_value(cond)
+ if cond_val:
+ val = min(expr_value(default), cond_val)
+ break
+
+ val = max(expr_value(self.rev_dep),
+ expr_value(self.weak_rev_dep),
+ val)
+
+ # Transpose mod to yes if type is bool (possibly due to modules
+ # being disabled)
+ if val == 1 and self.type is BOOL:
+ val = 2
+
+ return TRI_TO_STR[val]
+
+ if self.orig_type: # STRING/INT/HEX
+ for default, cond in self.defaults:
+ if expr_value(cond):
+ return default.str_value
+
+ return ""
+
+ def _warn_select_unsatisfied_deps(self):
+ # Helper for printing an informative warning when a symbol with
+ # unsatisfied direct dependencies (dependencies from 'depends on', ifs,
+ # and menus) is selected by some other symbol. Also warn if a symbol
+ # whose direct dependencies evaluate to m is selected to y.
+
+ msg = "{} has direct dependencies {} with value {}, but is " \
+ "currently being {}-selected by the following symbols:" \
+ .format(_name_and_loc(self), expr_str(self.direct_dep),
+ TRI_TO_STR[expr_value(self.direct_dep)],
+ TRI_TO_STR[expr_value(self.rev_dep)])
+
+ # The reverse dependencies from each select are ORed together
+ for select in split_expr(self.rev_dep, OR):
+ if expr_value(select) <= expr_value(self.direct_dep):
+ # Only include selects that exceed the direct dependencies
+ continue
+
+ # - 'select A if B' turns into A && B
+ # - 'select A' just turns into A
+ #
+ # In both cases, we can split on AND and pick the first operand
+ selecting_sym = split_expr(select, AND)[0]
+
+ msg += "\n - {}, with value {}, direct dependencies {} " \
+ "(value: {})" \
+ .format(_name_and_loc(selecting_sym),
+ selecting_sym.str_value,
+ expr_str(selecting_sym.direct_dep),
+ TRI_TO_STR[expr_value(selecting_sym.direct_dep)])
+
+ if select.__class__ is tuple:
+ msg += ", and select condition {} (value: {})" \
+ .format(expr_str(select[2]),
+ TRI_TO_STR[expr_value(select[2])])
+
+ self.kconfig._warn(msg)
+
+
+class Choice(object):
+ """
+ Represents a choice statement:
+
+ choice
+ ...
+ endchoice
+
+ The following attributes are available on Choice instances. They should be
+ treated as read-only, and some are implemented through @property magic (but
+ are still efficient to access due to internal caching).
+
+ Note: Prompts, help texts, and locations are stored in the Choice's
+ MenuNode(s) rather than in the Choice itself. Check the MenuNode class and
+ the Choice.nodes attribute. This organization matches the C tools.
+
+ name:
+ The name of the choice, e.g. "FOO" for 'choice FOO', or None if the
+ Choice has no name.
+
+ type:
+ The type of the choice. One of BOOL, TRISTATE, UNKNOWN. UNKNOWN is for
+ choices defined without a type where none of the contained symbols have a
+ type either (otherwise the choice inherits the type of the first symbol
+ defined with a type).
+
+ When running without modules (CONFIG_MODULES=n), TRISTATE choices
+ magically change type to BOOL. This matches the C tools, and makes sense
+ for menuconfig-like functionality.
+
+ orig_type:
+ The type as given in the Kconfig file, without any magic applied. Used
+ when printing the choice.
+
+ tri_value:
+ The tristate value (mode) of the choice. A choice can be in one of three
+ modes:
+
+ 0 (n) - The choice is disabled and no symbols can be selected. For
+ visible choices, this mode is only possible for choices with
+ the 'optional' flag set (see kconfig-language.txt).
+
+ 1 (m) - Any number of choice symbols can be set to m, the rest will
+ be n.
+
+ 2 (y) - One symbol will be y, the rest n.
+
+ Only tristate choices can be in m mode. The visibility of the choice is
+ an upper bound on the mode, and the mode in turn is an upper bound on the
+ visibility of the choice symbols.
+
+ To change the mode, use Choice.set_value().
+
+ Implementation note:
+ The C tools internally represent choices as a type of symbol, with
+ special-casing in many code paths. This is why there is a lot of
+ similarity to Symbol. The value (mode) of a choice is really just a
+ normal symbol value, and an implicit reverse dependency forces its
+ lower bound to m for visible non-optional choices (the reverse
+ dependency is 'm && <visibility>').
+
+ Symbols within choices get the choice propagated as a dependency to
+ their properties. This turns the mode of the choice into an upper bound
+ on e.g. the visibility of choice symbols, and explains the gotcha
+ related to printing choice symbols mentioned in the module docstring.
+
+ Kconfiglib uses a separate Choice class only because it makes the code
+ and interface less confusing (especially in a user-facing interface).
+ Corresponding attributes have the same name in the Symbol and Choice
+ classes, for consistency and compatibility.
+
+ assignable:
+ See the symbol class documentation. Gives the assignable values (modes).
+
+ visibility:
+ See the Symbol class documentation. Acts on the value (mode).
+
+ selection:
+ The Symbol instance of the currently selected symbol. None if the Choice
+ is not in y mode or has no selected symbol (due to unsatisfied
+ dependencies on choice symbols).
+
+ WARNING: Do not assign directly to this. It will break things. Call
+ sym.set_value(2) on the choice symbol you want to select instead.
+
+ user_value:
+ The value (mode) selected by the user through Choice.set_value(). Either
+ 0, 1, or 2, or None if the user hasn't selected a mode. See
+ Symbol.user_value.
+
+ WARNING: Do not assign directly to this. It will break things. Use
+ Choice.set_value() instead.
+
+ user_selection:
+ The symbol selected by the user (by setting it to y). Ignored if the
+ choice is not in y mode, but still remembered so that the choice "snaps
+ back" to the user selection if the mode is changed back to y. This might
+ differ from 'selection' due to unsatisfied dependencies.
+
+ WARNING: Do not assign directly to this. It will break things. Call
+ sym.set_value(2) on the choice symbol to be selected instead.
+
+ syms:
+ List of symbols contained in the choice.
+
+ Obscure gotcha: If a symbol depends on the previous symbol within a
+ choice so that an implicit menu is created, it won't be a choice symbol,
+ and won't be included in 'syms'.
+
+ nodes:
+ A list of MenuNodes for this choice. In practice, the list will probably
+ always contain a single MenuNode, but it is possible to give a choice a
+ name and define it in multiple locations.
+
+ defaults:
+ List of (symbol, cond) tuples for the choice's 'defaults' properties. For
+ example, 'default A if B && C' is represented as (A, (AND, B, C)). If
+ there is no condition, 'cond' is self.kconfig.y.
+
+ Note that 'depends on' and parent dependencies are propagated to
+ 'default' conditions.
+
+ orig_defaults:
+ See the corresponding attribute on the MenuNode class.
+
+ direct_dep:
+ See Symbol.direct_dep.
+
+ referenced:
+ A set() with all symbols referenced in the properties and property
+ conditions of the choice.
+
+ Also includes dependencies from surrounding menus and ifs, because those
+ get propagated to the choice (see the 'Intro to symbol values' section in
+ the module docstring).
+
+ is_optional:
+ True if the choice has the 'optional' flag set on it and can be in
+ n mode.
+
+ kconfig:
+ The Kconfig instance this choice is from.
+ """
+ __slots__ = (
+ "_cached_assignable",
+ "_cached_selection",
+ "_cached_vis",
+ "_dependents",
+ "_visited",
+ "_was_set",
+ "defaults",
+ "direct_dep",
+ "is_constant",
+ "is_optional",
+ "kconfig",
+ "name",
+ "nodes",
+ "orig_type",
+ "syms",
+ "user_selection",
+ "user_value",
+ )
+
+ #
+ # Public interface
+ #
+
+ @property
+ def type(self):
+ """
+ Returns the type of the choice. See Symbol.type.
+ """
+ if self.orig_type is TRISTATE and not self.kconfig.modules.tri_value:
+ return BOOL
+ return self.orig_type
+
+ @property
+ def str_value(self):
+ """
+ See the class documentation.
+ """
+ return TRI_TO_STR[self.tri_value]
+
+ @property
+ def tri_value(self):
+ """
+ See the class documentation.
+ """
+ # This emulates a reverse dependency of 'm && visibility' for
+ # non-optional choices, which is how the C implementation does it
+
+ val = 0 if self.is_optional else 1
+
+ if self.user_value is not None:
+ val = max(val, self.user_value)
+
+ # Warning: See Symbol._rec_invalidate(), and note that this is a hidden
+ # function call (property magic)
+ val = min(val, self.visibility)
+
+ # Promote m to y for boolean choices
+ return 2 if val == 1 and self.type is BOOL else val
+
+ @property
+ def assignable(self):
+ """
+ See the class documentation.
+ """
+ if self._cached_assignable is None:
+ self._cached_assignable = self._assignable()
+ return self._cached_assignable
+
+ @property
+ def visibility(self):
+ """
+ See the class documentation.
+ """
+ if self._cached_vis is None:
+ self._cached_vis = _visibility(self)
+ return self._cached_vis
+
+ @property
+ def selection(self):
+ """
+ See the class documentation.
+ """
+ if self._cached_selection is _NO_CACHED_SELECTION:
+ self._cached_selection = self._selection()
+ return self._cached_selection
+
+ def set_value(self, value):
+ """
+ Sets the user value (mode) of the choice. Like for Symbol.set_value(),
+ the visibility might truncate the value. Choices without the 'optional'
+ attribute (is_optional) can never be in n mode, but 0/"n" is still
+ accepted since it's not a malformed value (though it will have no
+ effect).
+
+ Returns True if the value is valid for the type of the choice, and
+ False otherwise. This only looks at the form of the value. Check the
+ Choice.assignable attribute to see what values are currently in range
+ and would actually be reflected in the mode of the choice.
+ """
+ if value in STR_TO_TRI:
+ value = STR_TO_TRI[value]
+
+ if value == self.user_value:
+ # We know the value must be valid if it was successfully set
+ # previously
+ self._was_set = True
+ return True
+
+ if not (self.orig_type is BOOL and value in (2, 0) or
+ self.orig_type is TRISTATE and value in TRI_TO_STR):
+
+ # Display tristate values as n, m, y in the warning
+ self.kconfig._warn(
+ "the value {} is invalid for {}, which has type {} -- "
+ "assignment ignored"
+ .format(TRI_TO_STR[value] if value in TRI_TO_STR else
+ "'{}'".format(value),
+ _name_and_loc(self), TYPE_TO_STR[self.orig_type]))
+
+ return False
+
+ self.user_value = value
+ self._was_set = True
+ self._rec_invalidate()
+
+ return True
+
+ def unset_value(self):
+ """
+ Resets the user value (mode) and user selection of the Choice, as if
+ the user had never touched the mode or any of the choice symbols.
+ """
+ if self.user_value is not None or self.user_selection:
+ self.user_value = self.user_selection = None
+ self._rec_invalidate()
+
+ @property
+ def referenced(self):
+ """
+ See the class documentation.
+ """
+ return {item for node in self.nodes for item in node.referenced}
+
+ @property
+ def orig_defaults(self):
+ """
+ See the class documentation.
+ """
+ return [d for node in self.nodes for d in node.orig_defaults]
+
+ def __repr__(self):
+ """
+ Returns a string with information about the choice when it is evaluated
+ on e.g. the interactive Python prompt.
+ """
+ fields = ["choice " + self.name if self.name else "choice",
+ TYPE_TO_STR[self.type]]
+ add = fields.append
+
+ for node in self.nodes:
+ if node.prompt:
+ add('"{}"'.format(node.prompt[0]))
+
+ add("mode " + self.str_value)
+
+ if self.user_value is not None:
+ add('user mode {}'.format(TRI_TO_STR[self.user_value]))
+
+ if self.selection:
+ add("{} selected".format(self.selection.name))
+
+ if self.user_selection:
+ user_sel_str = "{} selected by user" \
+ .format(self.user_selection.name)
+
+ if self.selection is not self.user_selection:
+ user_sel_str += " (overridden)"
+
+ add(user_sel_str)
+
+ add("visibility " + TRI_TO_STR[self.visibility])
+
+ if self.is_optional:
+ add("optional")
+
+ for node in self.nodes:
+ add("{}:{}".format(node.filename, node.linenr))
+
+ return "<{}>".format(", ".join(fields))
+
+ def __str__(self):
+ """
+ Returns a string representation of the choice when it is printed.
+ Matches the Kconfig format (though without the contained choice
+ symbols), with any parent dependencies propagated to the 'depends on'
+ condition.
+
+ The returned string does not end in a newline.
+
+ See Symbol.__str__() as well.
+ """
+ return self.custom_str(standard_sc_expr_str)
+
+ def custom_str(self, sc_expr_str_fn):
+ """
+ Works like Choice.__str__(), but allows a custom format to be used for
+ all symbol/choice references. See expr_str().
+ """
+ return "\n\n".join(node.custom_str(sc_expr_str_fn)
+ for node in self.nodes)
+
+ #
+ # Private methods
+ #
+
+ def __init__(self):
+ """
+ Choice constructor -- not intended to be called directly by Kconfiglib
+ clients.
+ """
+ # These attributes are always set on the instance from outside and
+ # don't need defaults:
+ # direct_dep
+ # kconfig
+
+ # - UNKNOWN == 0
+ # - _visited is used during dep. loop detection
+ self.orig_type = self._visited = 0
+
+ self.nodes = []
+
+ self.syms = []
+ self.defaults = []
+
+ self.name = \
+ self.user_value = self.user_selection = \
+ self._cached_vis = self._cached_assignable = None
+
+ self._cached_selection = _NO_CACHED_SELECTION
+
+ # is_constant is checked by _make_depend_on(). Just set it to avoid
+ # having to special-case choices.
+ self.is_constant = self.is_optional = False
+
+ # See Kconfig._build_dep()
+ self._dependents = set()
+
+ def _assignable(self):
+ # Worker function for the 'assignable' attribute
+
+ # Warning: See Symbol._rec_invalidate(), and note that this is a hidden
+ # function call (property magic)
+ vis = self.visibility
+
+ if not vis:
+ return ()
+
+ if vis == 2:
+ if not self.is_optional:
+ return (2,) if self.type is BOOL else (1, 2)
+ return (0, 2) if self.type is BOOL else (0, 1, 2)
+
+ # vis == 1
+
+ return (0, 1) if self.is_optional else (1,)
+
+ def _selection(self):
+ # Worker function for the 'selection' attribute
+
+ # Warning: See Symbol._rec_invalidate(), and note that this is a hidden
+ # function call (property magic)
+ if self.tri_value != 2:
+ # Not in y mode, so no selection
+ return None
+
+ # Use the user selection if it's visible
+ if self.user_selection and self.user_selection.visibility:
+ return self.user_selection
+
+ # Otherwise, check if we have a default
+ return self._selection_from_defaults()
+
+ def _selection_from_defaults(self):
+ # Check if we have a default
+ for sym, cond in self.defaults:
+ # The default symbol must be visible too
+ if expr_value(cond) and sym.visibility:
+ return sym
+
+ # Otherwise, pick the first visible symbol, if any
+ for sym in self.syms:
+ if sym.visibility:
+ return sym
+
+ # Couldn't find a selection
+ return None
+
+ def _invalidate(self):
+ self._cached_vis = self._cached_assignable = None
+ self._cached_selection = _NO_CACHED_SELECTION
+
+ def _rec_invalidate(self):
+ # See Symbol._rec_invalidate()
+
+ self._invalidate()
+
+ for item in self._dependents:
+ if item._cached_vis is not None:
+ item._rec_invalidate()
+
+
+class MenuNode(object):
+ """
+ Represents a menu node in the configuration. This corresponds to an entry
+ in e.g. the 'make menuconfig' interface, though non-visible choices, menus,
+ and comments also get menu nodes. If a symbol or choice is defined in
+ multiple locations, it gets one menu node for each location.
+
+ The top-level menu node, corresponding to the implicit top-level menu, is
+ available in Kconfig.top_node.
+
+ The menu nodes for a Symbol or Choice can be found in the
+ Symbol/Choice.nodes attribute. Menus and comments are represented as plain
+ menu nodes, with their text stored in the prompt attribute (prompt[0]).
+ This mirrors the C implementation.
+
+ The following attributes are available on MenuNode instances. They should
+ be viewed as read-only.
+
+ item:
+ Either a Symbol, a Choice, or one of the constants MENU and COMMENT.
+ Menus and comments are represented as plain menu nodes. Ifs are collapsed
+ (matching the C implementation) and do not appear in the final menu tree.
+
+ next:
+ The following menu node. None if there is no following node.
+
+ list:
+ The first child menu node. None if there are no children.
+
+ Choices and menus naturally have children, but Symbols can also have
+ children because of menus created automatically from dependencies (see
+ kconfig-language.txt).
+
+ parent:
+ The parent menu node. None if there is no parent.
+
+ prompt:
+ A (string, cond) tuple with the prompt for the menu node and its
+ conditional expression (which is self.kconfig.y if there is no
+ condition). None if there is no prompt.
+
+ For symbols and choices, the prompt is stored in the MenuNode rather than
+ the Symbol or Choice instance. For menus and comments, the prompt holds
+ the text.
+
+ defaults:
+ The 'default' properties for this particular menu node. See
+ symbol.defaults.
+
+ When evaluating defaults, you should use Symbol/Choice.defaults instead,
+ as it include properties from all menu nodes (a symbol/choice can have
+ multiple definition locations/menu nodes). MenuNode.defaults is meant for
+ documentation generation.
+
+ selects:
+ Like MenuNode.defaults, for selects.
+
+ implies:
+ Like MenuNode.defaults, for implies.
+
+ ranges:
+ Like MenuNode.defaults, for ranges.
+
+ orig_prompt:
+ orig_defaults:
+ orig_selects:
+ orig_implies:
+ orig_ranges:
+ These work the like the corresponding attributes without orig_*, but omit
+ any dependencies propagated from 'depends on' and surrounding 'if's (the
+ direct dependencies, stored in MenuNode.dep).
+
+ One use for this is generating less cluttered documentation, by only
+ showing the direct dependencies in one place.
+
+ help:
+ The help text for the menu node for Symbols and Choices. None if there is
+ no help text. Always stored in the node rather than the Symbol or Choice.
+ It is possible to have a separate help text at each location if a symbol
+ is defined in multiple locations.
+
+ Trailing whitespace (including a final newline) is stripped from the help
+ text. This was not the case before Kconfiglib 10.21.0, where the format
+ was undocumented.
+
+ dep:
+ The direct ('depends on') dependencies for the menu node, or
+ self.kconfig.y if there are no direct dependencies.
+
+ This attribute includes any dependencies from surrounding menus and ifs.
+ Those get propagated to the direct dependencies, and the resulting direct
+ dependencies in turn get propagated to the conditions of all properties.
+
+ If a symbol or choice is defined in multiple locations, only the
+ properties defined at a particular location get the corresponding
+ MenuNode.dep dependencies propagated to them.
+
+ visibility:
+ The 'visible if' dependencies for the menu node (which must represent a
+ menu), or self.kconfig.y if there are no 'visible if' dependencies.
+ 'visible if' dependencies are recursively propagated to the prompts of
+ symbols and choices within the menu.
+
+ referenced:
+ A set() with all symbols and choices referenced in the properties and
+ property conditions of the menu node.
+
+ Also includes dependencies inherited from surrounding menus and ifs.
+ Choices appear in the dependencies of choice symbols.
+
+ is_menuconfig:
+ Set to True if the children of the menu node should be displayed in a
+ separate menu. This is the case for the following items:
+
+ - Menus (node.item == MENU)
+
+ - Choices
+
+ - Symbols defined with the 'menuconfig' keyword. The children come from
+ implicitly created submenus, and should be displayed in a separate
+ menu rather than being indented.
+
+ 'is_menuconfig' is just a hint on how to display the menu node. It's
+ ignored internally by Kconfiglib, except when printing symbols.
+
+ filename/linenr:
+ The location where the menu node appears. The filename is relative to
+ $srctree (or to the current directory if $srctree isn't set), except
+ absolute paths are used for paths outside $srctree.
+
+ include_path:
+ A tuple of (filename, linenr) tuples, giving the locations of the
+ 'source' statements via which the Kconfig file containing this menu node
+ was included. The first element is the location of the 'source' statement
+ in the top-level Kconfig file passed to Kconfig.__init__(), etc.
+
+ Note that the Kconfig file of the menu node itself isn't included. Check
+ 'filename' and 'linenr' for that.
+
+ kconfig:
+ The Kconfig instance the menu node is from.
+ """
+ __slots__ = (
+ "dep",
+ "filename",
+ "help",
+ "include_path",
+ "is_menuconfig",
+ "item",
+ "kconfig",
+ "linenr",
+ "list",
+ "next",
+ "parent",
+ "prompt",
+ "visibility",
+
+ # Properties
+ "defaults",
+ "selects",
+ "implies",
+ "ranges",
+ )
+
+ def __init__(self):
+ # Properties defined on this particular menu node. A local 'depends on'
+ # only applies to these, in case a symbol is defined in multiple
+ # locations.
+ self.defaults = []
+ self.selects = []
+ self.implies = []
+ self.ranges = []
+
+ @property
+ def orig_prompt(self):
+ """
+ See the class documentation.
+ """
+ if not self.prompt:
+ return None
+ return (self.prompt[0], self._strip_dep(self.prompt[1]))
+
+ @property
+ def orig_defaults(self):
+ """
+ See the class documentation.
+ """
+ return [(default, self._strip_dep(cond))
+ for default, cond in self.defaults]
+
+ @property
+ def orig_selects(self):
+ """
+ See the class documentation.
+ """
+ return [(select, self._strip_dep(cond))
+ for select, cond in self.selects]
+
+ @property
+ def orig_implies(self):
+ """
+ See the class documentation.
+ """
+ return [(imply, self._strip_dep(cond))
+ for imply, cond in self.implies]
+
+ @property
+ def orig_ranges(self):
+ """
+ See the class documentation.
+ """
+ return [(low, high, self._strip_dep(cond))
+ for low, high, cond in self.ranges]
+
+ @property
+ def referenced(self):
+ """
+ See the class documentation.
+ """
+ # self.dep is included to catch dependencies from a lone 'depends on'
+ # when there are no properties to propagate it to
+ res = expr_items(self.dep)
+
+ if self.prompt:
+ res |= expr_items(self.prompt[1])
+
+ if self.item is MENU:
+ res |= expr_items(self.visibility)
+
+ for value, cond in self.defaults:
+ res |= expr_items(value)
+ res |= expr_items(cond)
+
+ for value, cond in self.selects:
+ res.add(value)
+ res |= expr_items(cond)
+
+ for value, cond in self.implies:
+ res.add(value)
+ res |= expr_items(cond)
+
+ for low, high, cond in self.ranges:
+ res.add(low)
+ res.add(high)
+ res |= expr_items(cond)
+
+ return res
+
+ def __repr__(self):
+ """
+ Returns a string with information about the menu node when it is
+ evaluated on e.g. the interactive Python prompt.
+ """
+ fields = []
+ add = fields.append
+
+ if self.item.__class__ is Symbol:
+ add("menu node for symbol " + self.item.name)
+
+ elif self.item.__class__ is Choice:
+ s = "menu node for choice"
+ if self.item.name is not None:
+ s += " " + self.item.name
+ add(s)
+
+ elif self.item is MENU:
+ add("menu node for menu")
+
+ else: # self.item is COMMENT
+ add("menu node for comment")
+
+ if self.prompt:
+ add('prompt "{}" (visibility {})'.format(
+ self.prompt[0], TRI_TO_STR[expr_value(self.prompt[1])]))
+
+ if self.item.__class__ is Symbol and self.is_menuconfig:
+ add("is menuconfig")
+
+ add("deps " + TRI_TO_STR[expr_value(self.dep)])
+
+ if self.item is MENU:
+ add("'visible if' deps " + TRI_TO_STR[expr_value(self.visibility)])
+
+ if self.item.__class__ in _SYMBOL_CHOICE and self.help is not None:
+ add("has help")
+
+ if self.list:
+ add("has child")
- "y" - One symbol will be "y" while the rest are "n".
+ if self.next:
+ add("has next")
- Only tristate choices can be in "m" mode, and the visibility of the choice
- is an upper bound on the mode, so that e.g. a choice that depends on a
- symbol with value "m" will be in "m" mode.
+ add("{}:{}".format(self.filename, self.linenr))
- The mode changes automatically when a value is assigned to a symbol within
- the choice.
+ return "<{}>".format(", ".join(fields))
- See Symbol.get_visibility() too."""
+ def __str__(self):
+ """
+ Returns a string representation of the menu node. Matches the Kconfig
+ format, with any parent dependencies propagated to the 'depends on'
+ condition.
- #
- # Public interface
- #
+ The output could (almost) be fed back into a Kconfig parser to redefine
+ the object associated with the menu node. See the module documentation
+ for a gotcha related to choice symbols.
- def get_config(self):
- """Returns the Config instance this choice is from."""
- return self.config
-
- def get_name(self):
- """For named choices, returns the name. Returns None for unnamed
- choices. No named choices appear anywhere in the kernel Kconfig files
- as of Linux 3.7.0-rc8."""
- return self.name
-
- def get_type(self):
- """Returns the type of the choice. See Symbol.get_type()."""
- return self.type
-
- def get_prompts(self):
- """Returns a list of prompts defined for the choice, in the order they
- appear in the configuration files. Returns the empty list for choices
- with no prompt.
-
- This list will have a single entry for the vast majority of choices
- having prompts, but having multiple prompts for a single choice is
- possible through having multiple 'choice' entries for it (though I'm
- not sure if that ever happens in practice)."""
- return [prompt for prompt, _ in self.orig_prompts]
-
- def get_help(self):
- """Returns the help text of the choice, or None if the choice has no
- help text."""
- return self.help
-
- def get_parent(self):
- """Returns the menu or choice statement that contains the choice, or
- None if the choice is at the top level. Note that if statements are
- treated as syntactic sugar and do not have an explicit class
- representation."""
- return self.parent
-
- def get_def_locations(self):
- """Returns a list of (filename, linenr) tuples, where filename (string)
- and linenr (int) represent a location where the choice is defined. For
- the vast majority of choices (all of them as of Linux 3.7.0-rc8) this
- list will only contain one element, but its possible for named choices
- to be defined in multiple locations."""
- return self.def_locations
-
- def get_selection(self):
- """Returns the symbol selected (either by the user or through
- defaults), or None if either no symbol is selected or the mode is not
- "y"."""
- if self.cached_selection is not None:
- if self.cached_selection == NO_SELECTION:
- return None
- return self.cached_selection
-
- if self.get_mode() != "y":
- return self._cache_ret(None)
-
- # User choice available?
- if self.user_val is not None and _get_visibility(self.user_val) == "y":
- return self._cache_ret(self.user_val)
-
- if self.optional:
- return self._cache_ret(None)
-
- return self._cache_ret(self.get_selection_from_defaults())
-
- def get_selection_from_defaults(self):
- """Like Choice.get_selection(), but acts as if no symbol has been
- selected by the user and no 'optional' flag is in effect."""
-
- if not self.actual_symbols:
- return None
+ For symbols and choices with multiple menu nodes (multiple definition
+ locations), properties that aren't associated with a particular menu
+ node are shown on all menu nodes ('option env=...', 'optional' for
+ choices, etc.).
- for symbol, cond_expr in self.def_exprs:
- if self.config._eval_expr(cond_expr) != "n":
- chosen_symbol = symbol
- break
- else:
- chosen_symbol = self.actual_symbols[0]
-
- # Is the chosen symbol visible?
- if _get_visibility(chosen_symbol) != "n":
- return chosen_symbol
- # Otherwise, pick the first visible symbol
- for sym in self.actual_symbols:
- if _get_visibility(sym) != "n":
- return sym
- return None
+ The returned string does not end in a newline.
+ """
+ return self.custom_str(standard_sc_expr_str)
- def get_user_selection(self):
- """If the choice is in "y" mode and has a user-selected symbol, returns
- that symbol. Otherwise, returns None."""
- return self.user_val
-
- def get_items(self):
- """Gets all items contained in the choice in the same order as within
- the configuration ("items" instead of "symbols" since choices and
- comments might appear within choices. This only happens in one place as
- of Linux 3.7.0-rc8, in drivers/usb/gadget/Kconfig)."""
- return self.block
-
- def get_symbols(self):
- """Returns a list containing the choice's symbols.
-
- A quirk (perhaps a bug) of Kconfig is that you can put items within a
- choice that will not be considered members of the choice insofar as
- selection is concerned. This happens for example if one symbol within a
- choice 'depends on' the symbol preceding it, or if you put non-symbol
- items within choices.
-
- As of Linux 3.7.0-rc8, this seems to be used intentionally in one
- place: drivers/usb/gadget/Kconfig.
-
- This function returns the "proper" symbols of the choice in the order
- they appear in the choice, excluding such items. If you want all items
- in the choice, use get_items()."""
- return self.actual_symbols
-
- def get_referenced_symbols(self, refs_from_enclosing=False):
- """See Symbol.get_referenced_symbols()."""
- return self.all_referenced_syms if refs_from_enclosing else \
- self.referenced_syms
-
- def get_visibility(self):
- """Returns the visibility of the choice statement: one of "n", "m" or
- "y". This acts as an upper limit on the mode of the choice (though bool
- choices can only have the mode "y"). See the class documentation for an
- explanation of modes."""
- return _get_visibility(self)
-
- def get_mode(self):
- """Returns the mode of the choice. See the class documentation for
- an explanation of modes."""
- minimum_mode = "n" if self.optional else "m"
- mode = self.user_mode if self.user_mode is not None else minimum_mode
- mode = self.config._eval_min(mode, _get_visibility(self))
-
- # Promote "m" to "y" for boolean choices
- if mode == "m" and self.type == BOOL:
- return "y"
-
- return mode
-
- def is_optional(self):
- """Returns True if the choice has the 'optional' flag set (and so will
- default to "n" mode)."""
- return self.optional
+ def custom_str(self, sc_expr_str_fn):
+ """
+ Works like MenuNode.__str__(), but allows a custom format to be used
+ for all symbol/choice references. See expr_str().
+ """
+ return self._menu_comment_node_str(sc_expr_str_fn) \
+ if self.item in _MENU_COMMENT else \
+ self._sym_choice_node_str(sc_expr_str_fn)
- def __str__(self):
- """Returns a string containing various information about the choice
- statement."""
- return self.config._get_sym_or_choice_str(self)
+ def _menu_comment_node_str(self, sc_expr_str_fn):
+ s = '{} "{}"'.format("menu" if self.item is MENU else "comment",
+ self.prompt[0])
- #
- # Private methods
- #
+ if self.dep is not self.kconfig.y:
+ s += "\n\tdepends on {}".format(expr_str(self.dep, sc_expr_str_fn))
- def __init__(self):
- """Choice constructor -- not intended to be called directly by
- Kconfiglib clients."""
-
- self.name = None # Yes, choices can be named
- self.type = UNKNOWN
- self.prompts = []
- self.def_exprs = [] # 'default' properties
- self.help = None # Help text
- self.block = [] # List of contained items
- self.config = None
- self.parent = None
-
- self.user_val = None
- self.user_mode = None
-
- # We need to filter out symbols that appear within the choice block but
- # are not considered choice items (see
- # Choice._determine_actual_symbols()) This list holds the "actual"
- # choice items.
- self.actual_symbols = []
-
- # The prompts and default values without any dependencies from
- # enclosing menus and ifs propagated
- self.orig_prompts = []
- self.orig_def_exprs = []
-
- # Dependencies inherited from containing menus and ifs
- self.deps_from_containing = None
- # The set of symbols referenced by this choice (see
- # get_referenced_symbols())
- self.referenced_syms = set()
- # Like 'referenced_syms', but includes symbols from
- # dependencies inherited from enclosing menus and ifs
- self.all_referenced_syms = set()
-
- # See Choice.get_def_locations()
- self.def_locations = []
-
- # Cached values
- self.cached_selection = None
- self.cached_visibility = None
-
- self.optional = False
-
- def _determine_actual_symbols(self):
- """If a symbol's visibility depends on the preceding symbol within a
- choice, it is no longer viewed as a choice item. (This is quite
- possibly a bug, but some things consciously use it... ugh. It stems
- from automatic submenu creation.) In addition, it's possible to have
- choices and comments within choices, and those shouldn't be considered
- choice items either. Only drivers/usb/gadget/Kconfig seems to depend on
- any of this. This method computes the "actual" items in the choice and
- sets the is_choice_sym flag on them (retrieved via is_choice_symbol()).
-
- Don't let this scare you: an earlier version simply checked for a
- sequence of symbols where all symbols after the first appeared in the
- 'depends on' expression of the first, and that worked fine. The added
- complexity is to be future-proof in the event that
- drivers/usb/gadget/Kconfig turns even more sinister. It might very well
- be overkilling things (especially if that file is refactored ;)."""
-
- # Items might depend on each other in a tree structure, so we need a
- # stack to keep track of the current tentative parent
- stack = []
-
- for item in self.block:
- if not isinstance(item, Symbol):
- stack = []
- continue
+ if self.item is MENU and self.visibility is not self.kconfig.y:
+ s += "\n\tvisible if {}".format(expr_str(self.visibility,
+ sc_expr_str_fn))
- while stack:
- if item._has_auto_menu_dep_on(stack[-1]):
- # The item should not be viewed as a choice item, so don't
- # set item.is_choice_sym
- stack.append(item)
- break
- else:
- stack.pop()
- else:
- item.is_choice_sym = True
- self.actual_symbols.append(item)
- stack.append(item)
-
- def _cache_ret(self, selection):
- # As None is used to indicate the lack of a cached value we can't use
- # that to cache the fact that the choice has no selection. Instead, we
- # use the symbolic constant NO_SELECTION.
- if selection is None:
- self.cached_selection = NO_SELECTION
+ return s
+
+ def _sym_choice_node_str(self, sc_expr_str_fn):
+ def indent_add(s):
+ lines.append("\t" + s)
+
+ def indent_add_cond(s, cond):
+ if cond is not self.kconfig.y:
+ s += " if " + expr_str(cond, sc_expr_str_fn)
+ indent_add(s)
+
+ sc = self.item
+
+ if sc.__class__ is Symbol:
+ lines = [("menuconfig " if self.is_menuconfig else "config ")
+ + sc.name]
else:
- self.cached_selection = selection
+ lines = ["choice " + sc.name if sc.name else "choice"]
- return selection
+ if sc.orig_type and not self.prompt: # sc.orig_type != UNKNOWN
+ # If there's a prompt, we'll use the '<type> "prompt"' shorthand
+ # instead
+ indent_add(TYPE_TO_STR[sc.orig_type])
- def _invalidate(self):
- self.cached_selection = None
- self.cached_visibility = None
+ if self.prompt:
+ if sc.orig_type:
+ prefix = TYPE_TO_STR[sc.orig_type]
+ else:
+ # Symbol defined without a type (which generates a warning)
+ prefix = "prompt"
- def _unset_user_value(self):
- self._invalidate()
- self.user_val = None
- self.user_mode = None
+ indent_add_cond(prefix + ' "{}"'.format(escape(self.prompt[0])),
+ self.orig_prompt[1])
- def _make_conf(self, append_fn):
- _make_block_conf(self.block, append_fn)
+ if sc.__class__ is Symbol:
+ if sc.is_allnoconfig_y:
+ indent_add("option allnoconfig_y")
-class Comment(Item):
+ if sc is sc.kconfig.defconfig_list:
+ indent_add("option defconfig_list")
- """Represents a comment statement."""
+ if sc.env_var is not None:
+ indent_add('option env="{}"'.format(sc.env_var))
- #
- # Public interface
- #
+ if sc is sc.kconfig.modules:
+ indent_add("option modules")
- def get_config(self):
- """Returns the Config instance this comment is from."""
- return self.config
+ for low, high, cond in self.orig_ranges:
+ indent_add_cond(
+ "range {} {}".format(sc_expr_str_fn(low),
+ sc_expr_str_fn(high)),
+ cond)
- def get_text(self):
- """Returns the text of the comment."""
- return self.text
+ for default, cond in self.orig_defaults:
+ indent_add_cond("default " + expr_str(default, sc_expr_str_fn),
+ cond)
- def get_parent(self):
- """Returns the menu or choice statement that contains the comment, or
- None if the comment is at the top level. Note that if statements are
- treated as syntactic sugar and do not have an explicit class
- representation."""
- return self.parent
+ if sc.__class__ is Choice and sc.is_optional:
+ indent_add("optional")
- def get_location(self):
- """Returns the location of the comment as a (filename, linenr) tuple,
- where filename is a string and linenr an int."""
- return (self.filename, self.linenr)
+ if sc.__class__ is Symbol:
+ for select, cond in self.orig_selects:
+ indent_add_cond("select " + sc_expr_str_fn(select), cond)
- def get_visibility(self):
- """Returns the visibility of the comment. See also
- Symbol.get_visibility()."""
- return self.config._eval_expr(self.dep_expr)
+ for imply, cond in self.orig_implies:
+ indent_add_cond("imply " + sc_expr_str_fn(imply), cond)
- def get_referenced_symbols(self, refs_from_enclosing=False):
- """See Symbol.get_referenced_symbols()."""
- return self.all_referenced_syms if refs_from_enclosing else \
- self.referenced_syms
+ if self.dep is not sc.kconfig.y:
+ indent_add("depends on " + expr_str(self.dep, sc_expr_str_fn))
- def __str__(self):
- """Returns a string containing various information about the
- comment."""
- dep_str = self.config._expr_val_str(self.orig_deps,
- "(no dependencies)")
-
- additional_deps_str = " " + \
- self.config._expr_val_str(self.deps_from_containing,
- "(no additional dependencies)")
-
- return _lines("Comment",
- "Text: " + str(self.text),
- "Dependencies: " + dep_str,
- "Additional dependencies from enclosing menus and "
- "ifs:",
- additional_deps_str,
- "Location: {0}:{1}".format(self.filename, self.linenr))
+ if self.help is not None:
+ indent_add("help")
+ for line in self.help.splitlines():
+ indent_add(" " + line)
- #
- # Private methods
- #
+ return "\n".join(lines)
- def __init__(self):
- """Comment constructor -- not intended to be called directly by
- Kconfiglib clients."""
-
- self.text = None
- self.dep_expr = None
- self.config = None
- self.parent = None
-
- # Dependency expression without dependencies from enclosing menus and
- # ifs propagated
- self.orig_deps = None
-
- # Dependencies inherited from containing menus and ifs
- self.deps_from_containing = None
- # The set of symbols referenced by this comment (see
- # get_referenced_symbols())
- self.referenced_syms = set()
- # Like 'referenced_syms', but includes symbols from
- # dependencies inherited from enclosing menus and ifs
- self.all_referenced_syms = None
+ def _strip_dep(self, expr):
+ # Helper function for removing MenuNode.dep from 'expr'. Uses two
+ # pieces of internal knowledge: (1) Expressions are reused rather than
+ # copied, and (2) the direct dependencies always appear at the end.
- self.filename = None
- self.linenr = None
+ # ... if dep -> ... if y
+ if self.dep is expr:
+ return self.kconfig.y
+
+ # (AND, X, dep) -> X
+ if expr.__class__ is tuple and expr[0] is AND and expr[2] is self.dep:
+ return expr[1]
+
+ return expr
+
+
+class Variable(object):
+ """
+ Represents a preprocessor variable/function.
+
+ The following attributes are available:
+
+ name:
+ The name of the variable.
+
+ value:
+ The unexpanded value of the variable.
+
+ expanded_value:
+ The expanded value of the variable. For simple variables (those defined
+ with :=), this will equal 'value'. Accessing this property will raise a
+ KconfigError if the expansion seems to be stuck in a loop.
+
+ Accessing this field is the same as calling expanded_value_w_args() with
+ no arguments. I hadn't considered function arguments when adding it. It
+ is retained for backwards compatibility though.
+
+ is_recursive:
+ True if the variable is recursive (defined with =).
+ """
+ __slots__ = (
+ "_n_expansions",
+ "is_recursive",
+ "kconfig",
+ "name",
+ "value",
+ )
- def _make_conf(self, append_fn):
- if self.config._eval_expr(self.dep_expr) != "n":
- append_fn("\n#\n# {0}\n#".format(self.text))
+ @property
+ def expanded_value(self):
+ """
+ See the class documentation.
+ """
+ return self.expanded_value_w_args()
+
+ def expanded_value_w_args(self, *args):
+ """
+ Returns the expanded value of the variable/function. Any arguments
+ passed will be substituted for $(1), $(2), etc.
+
+ Raises a KconfigError if the expansion seems to be stuck in a loop.
+ """
+ return self.kconfig._fn_val((self.name,) + args)
+
+ def __repr__(self):
+ return "<variable {}, {}, value '{}'>" \
+ .format(self.name,
+ "recursive" if self.is_recursive else "immediate",
+ self.value)
+
+
+class KconfigError(Exception):
+ """
+ Exception raised for Kconfig-related errors.
+
+ KconfigError and KconfigSyntaxError are the same class. The
+ KconfigSyntaxError alias is only maintained for backwards compatibility.
+ """
+
+KconfigSyntaxError = KconfigError # Backwards compatibility
+
+
+class InternalError(Exception):
+ "Never raised. Kept around for backwards compatibility."
+
+
+# Workaround:
+#
+# If 'errno' and 'strerror' are set on IOError, then __str__() always returns
+# "[Errno <errno>] <strerror>", ignoring any custom message passed to the
+# constructor. By defining our own subclass, we can use a custom message while
+# also providing 'errno', 'strerror', and 'filename' to scripts.
+class _KconfigIOError(IOError):
+ def __init__(self, ioerror, msg):
+ self.msg = msg
+ super(_KconfigIOError, self).__init__(
+ ioerror.errno, ioerror.strerror, ioerror.filename)
-class Kconfig_Syntax_Error(Exception):
- """Exception raised for syntax errors."""
- pass
+ def __str__(self):
+ return self.msg
-class Internal_Error(Exception):
- """Exception raised for internal errors."""
- pass
#
# Public functions
#
-def tri_less(v1, v2):
- """Returns True if the tristate v1 is less than the tristate v2, where "n",
- "m" and "y" are ordered from lowest to highest."""
- return TRI_TO_INT[v1] < TRI_TO_INT[v2]
-def tri_less_eq(v1, v2):
- """Returns True if the tristate v1 is less than or equal to the tristate
- v2, where "n", "m" and "y" are ordered from lowest to highest."""
- return TRI_TO_INT[v1] <= TRI_TO_INT[v2]
+def expr_value(expr):
+ """
+ Evaluates the expression 'expr' to a tristate value. Returns 0 (n), 1 (m),
+ or 2 (y).
-def tri_greater(v1, v2):
- """Returns True if the tristate v1 is greater than the tristate v2, where
- "n", "m" and "y" are ordered from lowest to highest."""
- return TRI_TO_INT[v1] > TRI_TO_INT[v2]
+ 'expr' must be an already-parsed expression from a Symbol, Choice, or
+ MenuNode property. To evaluate an expression represented as a string, use
+ Kconfig.eval_string().
-def tri_greater_eq(v1, v2):
- """Returns True if the tristate v1 is greater than or equal to the tristate
- v2, where "n", "m" and "y" are ordered from lowest to highest."""
- return TRI_TO_INT[v1] >= TRI_TO_INT[v2]
+ Passing subexpressions of expressions to this function works as expected.
+ """
+ if expr.__class__ is not tuple:
+ return expr.tri_value
-#
-# Internal classes
-#
+ if expr[0] is AND:
+ v1 = expr_value(expr[1])
+ # Short-circuit the n case as an optimization (~5% faster
+ # allnoconfig.py and allyesconfig.py, as of writing)
+ return 0 if not v1 else min(v1, expr_value(expr[2]))
-class _Feed(object):
+ if expr[0] is OR:
+ v1 = expr_value(expr[1])
+ # Short-circuit the y case as an optimization
+ return 2 if v1 == 2 else max(v1, expr_value(expr[2]))
- """Class for working with sequences in a stream-like fashion; handy for
- tokens."""
+ if expr[0] is NOT:
+ return 2 - expr_value(expr[1])
- # This would be more helpful on the item classes, but would remove some
- # flexibility
- __slots__ = ['items', 'length', 'i']
+ # Relation
+ #
+ # Implements <, <=, >, >= comparisons as well. These were added to
+ # kconfig in 31847b67 (kconfig: allow use of relations other than
+ # (in)equality).
- def __init__(self, items):
- self.items = items
- self.length = len(self.items)
- self.i = 0
+ rel, v1, v2 = expr
- def get_next(self):
- if self.i >= self.length:
- return None
- item = self.items[self.i]
- self.i += 1
- return item
-
- def peek_next(self):
- return None if self.i >= self.length else self.items[self.i]
-
- def check(self, token):
- """Check if the next token is 'token'. If so, remove it from the token
- feed and return True. Otherwise, leave it in and return False."""
- if self.i < self.length and self.items[self.i] == token:
- self.i += 1
- return True
- return False
+ # If both operands are strings...
+ if v1.orig_type is STRING and v2.orig_type is STRING:
+ # ...then compare them lexicographically
+ comp = _strcmp(v1.str_value, v2.str_value)
+ else:
+ # Otherwise, try to compare them as numbers
+ try:
+ comp = _sym_to_num(v1) - _sym_to_num(v2)
+ except ValueError:
+ # Fall back on a lexicographic comparison if the operands don't
+ # parse as numbers
+ comp = _strcmp(v1.str_value, v2.str_value)
+
+ return 2*(comp == 0 if rel is EQUAL else
+ comp != 0 if rel is UNEQUAL else
+ comp < 0 if rel is LESS else
+ comp <= 0 if rel is LESS_EQUAL else
+ comp > 0 if rel is GREATER else
+ comp >= 0)
+
+
+def standard_sc_expr_str(sc):
+ """
+ Standard symbol/choice printing function. Uses plain Kconfig syntax, and
+ displays choices as <choice> (or <choice NAME>, for named choices).
+
+ See expr_str().
+ """
+ if sc.__class__ is Symbol:
+ if sc.is_constant and sc.name not in STR_TO_TRI:
+ return '"{}"'.format(escape(sc.name))
+ return sc.name
+
+ return "<choice {}>".format(sc.name) if sc.name else "<choice>"
+
+
+def expr_str(expr, sc_expr_str_fn=standard_sc_expr_str):
+ """
+ Returns the string representation of the expression 'expr', as in a Kconfig
+ file.
+
+ Passing subexpressions of expressions to this function works as expected.
+
+ sc_expr_str_fn (default: standard_sc_expr_str):
+ This function is called for every symbol/choice (hence "sc") appearing in
+ the expression, with the symbol/choice as the argument. It is expected to
+ return a string to be used for the symbol/choice.
+
+ This can be used e.g. to turn symbols/choices into links when generating
+ documentation, or for printing the value of each symbol/choice after it.
+
+ Note that quoted values are represented as constants symbols
+ (Symbol.is_constant == True).
+ """
+ if expr.__class__ is not tuple:
+ return sc_expr_str_fn(expr)
+
+ if expr[0] is AND:
+ return "{} && {}".format(_parenthesize(expr[1], OR, sc_expr_str_fn),
+ _parenthesize(expr[2], OR, sc_expr_str_fn))
+
+ if expr[0] is OR:
+ # This turns A && B || C && D into "(A && B) || (C && D)", which is
+ # redundant, but more readable
+ return "{} || {}".format(_parenthesize(expr[1], AND, sc_expr_str_fn),
+ _parenthesize(expr[2], AND, sc_expr_str_fn))
+
+ if expr[0] is NOT:
+ if expr[1].__class__ is tuple:
+ return "!({})".format(expr_str(expr[1], sc_expr_str_fn))
+ return "!" + sc_expr_str_fn(expr[1]) # Symbol
+
+ # Relation
+ #
+ # Relation operands are always symbols (quoted strings are constant
+ # symbols)
+ return "{} {} {}".format(sc_expr_str_fn(expr[1]), REL_TO_STR[expr[0]],
+ sc_expr_str_fn(expr[2]))
- def unget_all(self):
- self.i = 0
-class _FileFeed(object):
+def expr_items(expr):
+ """
+ Returns a set() of all items (symbols and choices) that appear in the
+ expression 'expr'.
- """Feeds lines from a file. Keeps track of the filename and current line
- number. Joins any line ending in \\ with the following line. We need to be
- careful to get the line number right in the presence of continuation
- lines."""
+ Passing subexpressions of expressions to this function works as expected.
+ """
+ res = set()
- __slots__ = ['filename', 'lines', 'length', 'linenr']
+ def rec(subexpr):
+ if subexpr.__class__ is tuple:
+ # AND, OR, NOT, or relation
- def __init__(self, filename):
- self.filename = _clean_up_path(filename)
- with open(filename, "r") as f:
- # No interleaving of I/O and processing yet. Don't know if it would
- # help.
- self.lines = f.readlines()
- self.length = len(self.lines)
- self.linenr = 0
+ rec(subexpr[1])
- def get_next(self):
- if self.linenr >= self.length:
- return None
- line = self.lines[self.linenr]
- self.linenr += 1
- while line.endswith("\\\n"):
- line = line[:-2] + self.lines[self.linenr]
- self.linenr += 1
- return line
+ # NOTs only have a single operand
+ if subexpr[0] is not NOT:
+ rec(subexpr[2])
- def peek_next(self):
- linenr = self.linenr
- if linenr >= self.length:
- return None
- line = self.lines[linenr]
- while line.endswith("\\\n"):
- linenr += 1
- line = line[:-2] + self.lines[linenr]
- return line
-
- def unget(self):
- self.linenr -= 1
- while self.lines[self.linenr].endswith("\\\n"):
- self.linenr -= 1
-
- def next_nonblank(self):
- """Removes lines up to and including the next non-blank (not all-space)
- line and returns it. Returns None if there are no more non-blank
- lines."""
- while 1:
- line = self.get_next()
- if line is None or not line.isspace():
- return line
+ else:
+ # Symbol or choice
+ res.add(subexpr)
-#
-# Internal functions
-#
+ rec(expr)
+ return res
-def _get_visibility(sc):
- """Symbols and Choices have a "visibility" that acts as an upper bound on
- the values a user can set for them, corresponding to the visibility in e.g.
- 'make menuconfig'. This function calculates the visibility for the Symbol
- or Choice 'sc' -- the logic is nearly identical."""
- if sc.cached_visibility is None:
- vis = "n"
- for _, cond_expr in sc.prompts:
- vis = sc.config._eval_max(vis, cond_expr)
-
- if isinstance(sc, Symbol) and sc.is_choice_sym:
- if sc.type == TRISTATE and vis == "m" and \
- sc.parent.get_mode() == "y":
- # Choice symbols with visibility "m" are not visible if the
- # choice has mode "y"
- vis = "n"
- else:
- vis = sc.config._eval_min(vis, _get_visibility(sc.parent))
- # Promote "m" to "y" if we're dealing with a non-tristate
- if vis == "m" and sc.type != TRISTATE:
- vis = "y"
+def split_expr(expr, op):
+ """
+ Returns a list containing the top-level AND or OR operands in the
+ expression 'expr', in the same (left-to-right) order as they appear in
+ the expression.
- sc.cached_visibility = vis
+ This can be handy e.g. for splitting (weak) reverse dependencies
+ from 'select' and 'imply' into individual selects/implies.
- return sc.cached_visibility
+ op:
+ Either AND to get AND operands, or OR to get OR operands.
-def _make_and(e1, e2):
- """Constructs an AND (&&) expression. Performs trivial simplification.
- Nones equate to 'y'.
+ (Having this as an operand might be more future-safe than having two
+ hardcoded functions.)
- Note: returns None if e1 == e2 == None."""
- if e1 is None or e1 == "y":
- return e2
- if e2 is None or e2 == "y":
- return e1
- # Prefer to merge argument lists if possible to reduce the number of nodes
+ Pseudo-code examples:
- if isinstance(e1, tuple) and e1[0] == AND:
- if isinstance(e2, tuple) and e2[0] == AND:
- return (AND, e1[1] + e2[1])
- return (AND, e1[1] + [e2])
+ split_expr( A , OR ) -> [A]
+ split_expr( A && B , OR ) -> [A && B]
+ split_expr( A || B , OR ) -> [A, B]
+ split_expr( A || B , AND ) -> [A || B]
+ split_expr( A || B || (C && D) , OR ) -> [A, B, C && D]
- if isinstance(e2, tuple) and e2[0] == AND:
- return (AND, e2[1] + [e1])
+ # Second || is not at the top level
+ split_expr( A || (B && (C || D)) , OR ) -> [A, B && (C || D)]
+
+ # Parentheses don't matter as long as we stay at the top level (don't
+ # encounter any non-'op' nodes)
+ split_expr( (A || B) || C , OR ) -> [A, B, C]
+ split_expr( A || (B || C) , OR ) -> [A, B, C]
+ """
+ res = []
+
+ def rec(subexpr):
+ if subexpr.__class__ is tuple and subexpr[0] is op:
+ rec(subexpr[1])
+ rec(subexpr[2])
+ else:
+ res.append(subexpr)
+
+ rec(expr)
+ return res
- return (AND, [e1, e2])
-def _make_or(e1, e2):
- """Constructs an OR (||) expression. Performs trivial simplification and
- avoids Nones. Nones equate to 'y', which is usually what we want, but needs
- to be kept in mind."""
+def escape(s):
+ r"""
+ Escapes the string 's' in the same fashion as is done for display in
+ Kconfig format and when writing strings to a .config file. " and \ are
+ replaced by \" and \\, respectively.
+ """
+ # \ must be escaped before " to avoid double escaping
+ return s.replace("\\", r"\\").replace('"', r'\"')
- # Perform trivial simplification and avoid None's (which
- # correspond to y's)
- if e1 is None or e2 is None or e1 == "y" or e2 == "y":
- return "y"
- if e1 == "n":
- return e2
- # Prefer to merge argument lists if possible to reduce the number of nodes
+def unescape(s):
+ r"""
+ Unescapes the string 's'. \ followed by any character is replaced with just
+ that character. Used internally when reading .config files.
+ """
+ return _unescape_sub(r"\1", s)
- if isinstance(e1, tuple) and e1[0] == OR:
- if isinstance(e2, tuple) and e2[0] == OR:
- return (OR, e1[1] + e2[1])
- return (OR, e1[1] + [e2])
+# unescape() helper
+_unescape_sub = re.compile(r"\\(.)").sub
- if isinstance(e2, tuple) and e2[0] == OR:
- return (OR, e2[1] + [e1])
- return (OR, [e1, e2])
+def standard_kconfig():
+ """
+ Helper for tools. Loads the top-level Kconfig specified as the first
+ command-line argument, or "Kconfig" if there are no command-line arguments.
+ Returns the Kconfig instance.
-def _get_expr_syms_rec(expr, res):
- """_get_expr_syms() helper. Recurses through expressions."""
- if isinstance(expr, Symbol):
- res.add(expr)
- elif isinstance(expr, str):
+ Exits with sys.exit() (which raises a SystemExit exception) and prints a
+ usage note to stderr if more than one command-line argument is passed.
+ """
+ if len(sys.argv) > 2:
+ sys.exit("usage: {} [Kconfig]".format(sys.argv[0]))
+
+ # Only show backtraces for unexpected exceptions
+ try:
+ return Kconfig("Kconfig" if len(sys.argv) < 2 else sys.argv[1])
+ except (EnvironmentError, KconfigError) as e:
+ # Some long exception messages have extra newlines for better
+ # formatting when reported as an unhandled exception. Strip them here.
+ sys.exit(str(e).strip())
+
+
+def standard_config_filename():
+ """
+ Helper for tools. Returns the value of KCONFIG_CONFIG (which specifies the
+ .config file to load/save) if it is set, and ".config" otherwise.
+
+ Calling load_config() with filename=None might give the behavior you want,
+ without having to use this function.
+ """
+ return os.getenv("KCONFIG_CONFIG", ".config")
+
+
+def load_allconfig(kconf, filename):
+ """
+ Helper for all*config. Loads (merges) the configuration file specified by
+ KCONFIG_ALLCONFIG, if any. See Documentation/kbuild/kconfig.txt in the
+ Linux kernel.
+
+ Disables warnings for duplicated assignments within configuration files for
+ the duration of the call (kconf.warn_assign_override/warn_assign_redun = False),
+ and restores the previous warning settings at the end. The
+ KCONFIG_ALLCONFIG configuration file is expected to override symbols.
+
+ Exits with sys.exit() (which raises a SystemExit exception) and prints an
+ error to stderr if KCONFIG_ALLCONFIG is set but the configuration file
+ can't be opened.
+
+ kconf:
+ Kconfig instance to load the configuration in.
+
+ filename:
+ Command-specific configuration filename - "allyes.config",
+ "allno.config", etc.
+ """
+ allconfig = os.getenv("KCONFIG_ALLCONFIG")
+ if allconfig is None:
return
- elif expr[0] == AND or expr[0] == OR:
- for term in expr[1]:
- _get_expr_syms_rec(term, res)
- elif expr[0] == NOT:
- _get_expr_syms_rec(expr[1], res)
- elif expr[0] == EQUAL or expr[0] == UNEQUAL:
- if isinstance(expr[1], Symbol):
- res.add(expr[1])
- if isinstance(expr[2], Symbol):
- res.add(expr[2])
+
+ def std_msg(e):
+ # "Upcasts" a _KconfigIOError to an IOError, removing the custom
+ # __str__() message. The standard message is better here.
+ #
+ # This might also convert an OSError to an IOError in obscure cases,
+ # but it's probably not a big deal. The distinction is shaky (see
+ # PEP-3151).
+ return IOError(e.errno, e.strerror, e.filename)
+
+ old_warn_assign_override = kconf.warn_assign_override
+ old_warn_assign_redun = kconf.warn_assign_redun
+ kconf.warn_assign_override = kconf.warn_assign_redun = False
+
+ if allconfig in ("", "1"):
+ try:
+ print(kconf.load_config(filename, False))
+ except EnvironmentError as e1:
+ try:
+ print(kconf.load_config("all.config", False))
+ except EnvironmentError as e2:
+ sys.exit("error: KCONFIG_ALLCONFIG is set, but neither {} "
+ "nor all.config could be opened: {}, {}"
+ .format(filename, std_msg(e1), std_msg(e2)))
else:
- _internal_error("Internal error while fetching symbols from an "
- "expression with token stream {0}.".format(expr))
+ try:
+ print(kconf.load_config(allconfig, False))
+ except EnvironmentError as e:
+ sys.exit("error: KCONFIG_ALLCONFIG is set to '{}', which "
+ "could not be opened: {}"
+ .format(allconfig, std_msg(e)))
-def _get_expr_syms(expr):
- """Returns the set() of symbols appearing in expr."""
- res = set()
- if expr is not None:
- _get_expr_syms_rec(expr, res)
- return res
+ kconf.warn_assign_override = old_warn_assign_override
+ kconf.warn_assign_redun = old_warn_assign_redun
-def _str_val(obj):
- """Returns the value of obj as a string. If obj is not a string (constant
- symbol), it must be a Symbol."""
- return obj if isinstance(obj, str) else obj.get_value()
-
-def _make_block_conf(block, append_fn):
- """Returns a list of .config strings for a block (list) of items."""
-
- # Collect the substrings in a list and later use join() instead of += to
- # build the final .config contents. With older Python versions, this yields
- # linear instead of quadratic complexity.
- for item in block:
- item._make_conf(append_fn)
-
-def _sym_str_string(sym_or_str):
- if isinstance(sym_or_str, str):
- return '"' + sym_or_str + '"'
- return sym_or_str.name
-
-def _intersperse(lst, op):
- """_expr_to_str() helper. Gets the string representation of each expression
- in lst and produces a list where op has been inserted between the
- elements."""
- if not lst:
- return ""
- res = []
+#
+# Internal functions
+#
- def handle_sub_expr(expr):
- no_parens = isinstance(expr, (str, Symbol)) or \
- expr[0] in (EQUAL, UNEQUAL) or \
- PRECEDENCE[op] <= PRECEDENCE[expr[0]]
- if not no_parens:
- res.append("(")
- res.extend(_expr_to_str_rec(expr))
- if not no_parens:
- res.append(")")
- op_str = OP_TO_STR[op]
+def _visibility(sc):
+ # Symbols and Choices have a "visibility" that acts as an upper bound on
+ # the values a user can set for them, corresponding to the visibility in
+ # e.g. 'make menuconfig'. This function calculates the visibility for the
+ # Symbol or Choice 'sc' -- the logic is nearly identical.
- handle_sub_expr(lst[0])
- for expr in lst[1:]:
- res.append(op_str)
- handle_sub_expr(expr)
+ vis = 0
- return res
+ for node in sc.nodes:
+ if node.prompt:
+ vis = max(vis, expr_value(node.prompt[1]))
-def _expr_to_str_rec(expr):
- if expr is None:
- return [""]
+ if sc.__class__ is Symbol and sc.choice:
+ if sc.choice.orig_type is TRISTATE and \
+ sc.orig_type is not TRISTATE and sc.choice.tri_value != 2:
+ # Non-tristate choice symbols are only visible in y mode
+ return 0
- if isinstance(expr, (Symbol, str)):
- return [_sym_str_string(expr)]
+ if sc.orig_type is TRISTATE and vis == 1 and sc.choice.tri_value == 2:
+ # Choice symbols with m visibility are not visible in y mode
+ return 0
- if expr[0] in (AND, OR):
- return _intersperse(expr[1], expr[0])
+ # Promote m to y if we're dealing with a non-tristate (possibly due to
+ # modules being disabled)
+ if vis == 1 and sc.type is not TRISTATE:
+ return 2
- if expr[0] == NOT:
- need_parens = not isinstance(expr[1], (str, Symbol))
+ return vis
- res = ["!"]
- if need_parens:
- res.append("(")
- res.extend(_expr_to_str_rec(expr[1]))
- if need_parens:
- res.append(")")
- return res
- if expr[0] in (EQUAL, UNEQUAL):
- return [_sym_str_string(expr[1]),
- OP_TO_STR[expr[0]],
- _sym_str_string(expr[2])]
+def _make_depend_on(sc, expr):
+ # Adds 'sc' (symbol or choice) as a "dependee" to all symbols in 'expr'.
+ # Constant symbols in 'expr' are skipped as they can never change value
+ # anyway.
+
+ if expr.__class__ is tuple:
+ # AND, OR, NOT, or relation
+
+ _make_depend_on(sc, expr[1])
+
+ # NOTs only have a single operand
+ if expr[0] is not NOT:
+ _make_depend_on(sc, expr[2])
+
+ elif not expr.is_constant:
+ # Non-constant symbol, or choice
+ expr._dependents.add(sc)
+
-def _expr_to_str(expr):
- return "".join(_expr_to_str_rec(expr))
+def _parenthesize(expr, type_, sc_expr_str_fn):
+ # expr_str() helper. Adds parentheses around expressions of type 'type_'.
-def _indentation(line):
- """Returns the length of the line's leading whitespace, treating tab stops
- as being spaced 8 characters apart."""
- line = line.expandtabs()
- return len(line) - len(line.lstrip())
+ if expr.__class__ is tuple and expr[0] is type_:
+ return "({})".format(expr_str(expr, sc_expr_str_fn))
+ return expr_str(expr, sc_expr_str_fn)
+
+
+def _ordered_unique(lst):
+ # Returns 'lst' with any duplicates removed, preserving order. This hacky
+ # version seems to be a common idiom. It relies on short-circuit evaluation
+ # and set.add() returning None, which is falsy.
+
+ seen = set()
+ seen_add = seen.add
+ return [x for x in lst if x not in seen and not seen_add(x)]
-def _deindent(line, indent):
- """Deindent 'line' by 'indent' spaces."""
- line = line.expandtabs()
- if len(line) <= indent:
- return line
- return line[indent:]
def _is_base_n(s, n):
try:
except ValueError:
return False
-def _lines(*args):
- """Returns a string consisting of all arguments, with newlines inserted
- between them."""
- return "\n".join(args)
-
-def _comment(s):
- """Returns a new string with "#" inserted before each line in 's'."""
- if not s:
- return "#"
- res = "".join(["#" + line for line in s.splitlines(True)])
- if s.endswith("\n"):
- return res + "#"
- return res
-def _clean_up_path(path):
- """Strips an initial "./" and any trailing slashes from 'path'."""
- if path.startswith("./"):
- path = path[2:]
- return path.rstrip("/")
-
-def _build_msg(msg, filename, linenr):
- if filename is not None:
- msg = "{0}:{1}: ".format(_clean_up_path(filename), linenr) + msg
- return msg
-
-def _stderr_msg(msg, filename, linenr):
- sys.stderr.write(_build_msg(msg, filename, linenr) + "\n")
-
-def _tokenization_error(s, filename, linenr):
- loc = "" if filename is None else "{0}:{1}: ".format(filename, linenr)
- raise Kconfig_Syntax_Error("{0}Couldn't tokenize '{1}'"
- .format(loc, s.strip()))
-
-def _parse_error(s, msg, filename, linenr):
- loc = "" if filename is None else "{0}:{1}: ".format(filename, linenr)
- raise Kconfig_Syntax_Error("{0}Couldn't parse '{1}'{2}"
- .format(loc, s.strip(),
- "." if msg is None else ": " + msg))
-
-def _internal_error(msg):
- raise Internal_Error(msg +
- "\nSorry! You may want to send an email to ulfalizer a.t Google's "
- "email service to tell me about this. Include the message above and the "
- "stack trace and describe what you were doing.")
+def _strcmp(s1, s2):
+ # strcmp()-alike that returns -1, 0, or 1
+
+ return (s1 > s2) - (s1 < s2)
+
+
+def _sym_to_num(sym):
+ # expr_value() helper for converting a symbol to a number. Raises
+ # ValueError for symbols that can't be converted.
+
+ # For BOOL and TRISTATE, n/m/y count as 0/1/2. This mirrors 9059a3493ef
+ # ("kconfig: fix relational operators for bool and tristate symbols") in
+ # the C implementation.
+ return sym.tri_value if sym.orig_type in _BOOL_TRISTATE else \
+ int(sym.str_value, _TYPE_TO_BASE[sym.orig_type])
+
+
+def _touch_dep_file(path, sym_name):
+ # If sym_name is MY_SYM_NAME, touches my/sym/name.h. See the sync_deps()
+ # docstring.
+
+ sym_path = path + os.sep + sym_name.lower().replace("_", os.sep) + ".h"
+ sym_path_dir = dirname(sym_path)
+ if not exists(sym_path_dir):
+ os.makedirs(sym_path_dir, 0o755)
+
+ # A kind of truncating touch, mirroring the C tools
+ os.close(os.open(
+ sym_path, os.O_WRONLY | os.O_CREAT | os.O_TRUNC, 0o644))
+
+
+def _save_old(path):
+ # See write_config()
+
+ def copy(src, dst):
+ # Import as needed, to save some startup time
+ import shutil
+ shutil.copyfile(src, dst)
+
+ if islink(path):
+ # Preserve symlinks
+ copy_fn = copy
+ elif hasattr(os, "replace"):
+ # Python 3 (3.3+) only. Best choice when available, because it
+ # removes <filename>.old on both *nix and Windows.
+ copy_fn = os.replace
+ elif os.name == "posix":
+ # Removes <filename>.old on POSIX systems
+ copy_fn = os.rename
+ else:
+ # Fall back on copying
+ copy_fn = copy
+
+ try:
+ copy_fn(path, path + ".old")
+ except Exception:
+ # Ignore errors from 'path' missing as well as other errors.
+ # <filename>.old file is usually more of a nice-to-have, and not worth
+ # erroring out over e.g. if <filename>.old happens to be a directory or
+ # <filename> is something like /dev/null.
+ pass
+
+
+def _name_and_loc(sc):
+ # Helper for giving the symbol/choice name and location(s) in e.g. warnings
+
+ # Reuse the expression format. That way choices show up as
+ # '<choice (name, if any)>'
+ name = standard_sc_expr_str(sc)
+
+ if not sc.nodes:
+ return name + " (undefined)"
+
+ return "{} (defined at {})".format(
+ name,
+ ", ".join("{}:{}".format(node.filename, node.linenr)
+ for node in sc.nodes))
+
+
+# Menu manipulation
+
+
+def _expr_depends_on(expr, sym):
+ # Reimplementation of expr_depends_symbol() from mconf.c. Used to determine
+ # if a submenu should be implicitly created. This also influences which
+ # items inside choice statements are considered choice items.
+
+ if expr.__class__ is not tuple:
+ return expr is sym
+
+ if expr[0] in _EQUAL_UNEQUAL:
+ # Check for one of the following:
+ # sym = m/y, m/y = sym, sym != n, n != sym
+
+ left, right = expr[1:]
+
+ if right is sym:
+ left, right = right, left
+ elif left is not sym:
+ return False
+
+ return (expr[0] is EQUAL and right is sym.kconfig.m or
+ right is sym.kconfig.y) or \
+ (expr[0] is UNEQUAL and right is sym.kconfig.n)
+
+ return expr[0] is AND and \
+ (_expr_depends_on(expr[1], sym) or
+ _expr_depends_on(expr[2], sym))
+
+
+def _auto_menu_dep(node1, node2):
+ # Returns True if node2 has an "automatic menu dependency" on node1. If
+ # node2 has a prompt, we check its condition. Otherwise, we look directly
+ # at node2.dep.
+
+ return _expr_depends_on(node2.prompt[1] if node2.prompt else node2.dep,
+ node1.item)
+
+
+def _flatten(node):
+ # "Flattens" menu nodes without prompts (e.g. 'if' nodes and non-visible
+ # symbols with children from automatic menu creation) so that their
+ # children appear after them instead. This gives a clean menu structure
+ # with no unexpected "jumps" in the indentation.
+ #
+ # Do not flatten promptless choices (which can appear "legitimately" if a
+ # named choice is defined in multiple locations to add on symbols). It
+ # looks confusing, and the menuconfig already shows all choice symbols if
+ # you enter the choice at some location with a prompt.
+
+ while node:
+ if node.list and not node.prompt and \
+ node.item.__class__ is not Choice:
+
+ last_node = node.list
+ while 1:
+ last_node.parent = node.parent
+ if not last_node.next:
+ break
+ last_node = last_node.next
+
+ last_node.next = node.next
+ node.next = node.list
+ node.list = None
+
+ node = node.next
+
+
+def _remove_ifs(node):
+ # Removes 'if' nodes (which can be recognized by MenuNode.item being None),
+ # which are assumed to already have been flattened. The C implementation
+ # doesn't bother to do this, but we expose the menu tree directly, and it
+ # makes it nicer to work with.
+
+ cur = node.list
+ while cur and not cur.item:
+ cur = cur.next
+
+ node.list = cur
+
+ while cur:
+ next = cur.next
+ while next and not next.item:
+ next = next.next
+
+ # Equivalent to
+ #
+ # cur.next = next
+ # cur = next
+ #
+ # due to tricky Python semantics. The order matters.
+ cur.next = cur = next
+
+
+def _finalize_choice(node):
+ # Finalizes a choice, marking each symbol whose menu node has the choice as
+ # the parent as a choice symbol, and automatically determining types if not
+ # specified.
+
+ choice = node.item
+
+ cur = node.list
+ while cur:
+ if cur.item.__class__ is Symbol:
+ cur.item.choice = choice
+ choice.syms.append(cur.item)
+ cur = cur.next
+
+ # If no type is specified for the choice, its type is that of
+ # the first choice item with a specified type
+ if not choice.orig_type:
+ for item in choice.syms:
+ if item.orig_type:
+ choice.orig_type = item.orig_type
+ break
+
+ # Each choice item of UNKNOWN type gets the type of the choice
+ for sym in choice.syms:
+ if not sym.orig_type:
+ sym.orig_type = choice.orig_type
+
+
+def _check_dep_loop_sym(sym, ignore_choice):
+ # Detects dependency loops using depth-first search on the dependency graph
+ # (which is calculated earlier in Kconfig._build_dep()).
+ #
+ # Algorithm:
+ #
+ # 1. Symbols/choices start out with _visited = 0, meaning unvisited.
+ #
+ # 2. When a symbol/choice is first visited, _visited is set to 1, meaning
+ # "visited, potentially part of a dependency loop". The recursive
+ # search then continues from the symbol/choice.
+ #
+ # 3. If we run into a symbol/choice X with _visited already set to 1,
+ # there's a dependency loop. The loop is found on the call stack by
+ # recording symbols while returning ("on the way back") until X is seen
+ # again.
+ #
+ # 4. Once a symbol/choice and all its dependencies (or dependents in this
+ # case) have been checked recursively without detecting any loops, its
+ # _visited is set to 2, meaning "visited, not part of a dependency
+ # loop".
+ #
+ # This saves work if we run into the symbol/choice again in later calls
+ # to _check_dep_loop_sym(). We just return immediately.
+ #
+ # Choices complicate things, as every choice symbol depends on every other
+ # choice symbol in a sense. When a choice is "entered" via a choice symbol
+ # X, we visit all choice symbols from the choice except X, and prevent
+ # immediately revisiting the choice with a flag (ignore_choice).
+ #
+ # Maybe there's a better way to handle this (different flags or the
+ # like...)
+
+ if not sym._visited:
+ # sym._visited == 0, unvisited
+
+ sym._visited = 1
+
+ for dep in sym._dependents:
+ # Choices show up in Symbol._dependents when the choice has the
+ # symbol in a 'prompt' or 'default' condition (e.g.
+ # 'default ... if SYM').
+ #
+ # Since we aren't entering the choice via a choice symbol, all
+ # choice symbols need to be checked, hence the None.
+ loop = _check_dep_loop_choice(dep, None) \
+ if dep.__class__ is Choice \
+ else _check_dep_loop_sym(dep, False)
+
+ if loop:
+ # Dependency loop found
+ return _found_dep_loop(loop, sym)
+
+ if sym.choice and not ignore_choice:
+ loop = _check_dep_loop_choice(sym.choice, sym)
+ if loop:
+ # Dependency loop found
+ return _found_dep_loop(loop, sym)
+
+ # The symbol is not part of a dependency loop
+ sym._visited = 2
+
+ # No dependency loop found
+ return None
+
+ if sym._visited == 2:
+ # The symbol was checked earlier and is already known to not be part of
+ # a dependency loop
+ return None
+
+ # sym._visited == 1, found a dependency loop. Return the symbol as the
+ # first element in it.
+ return (sym,)
+
+
+def _check_dep_loop_choice(choice, skip):
+ if not choice._visited:
+ # choice._visited == 0, unvisited
+
+ choice._visited = 1
+
+ # Check for loops involving choice symbols. If we came here via a
+ # choice symbol, skip that one, as we'd get a false positive
+ # '<sym FOO> -> <choice> -> <sym FOO>' loop otherwise.
+ for sym in choice.syms:
+ if sym is not skip:
+ # Prevent the choice from being immediately re-entered via the
+ # "is a choice symbol" path by passing True
+ loop = _check_dep_loop_sym(sym, True)
+ if loop:
+ # Dependency loop found
+ return _found_dep_loop(loop, choice)
+
+ # The choice is not part of a dependency loop
+ choice._visited = 2
+
+ # No dependency loop found
+ return None
+ if choice._visited == 2:
+ # The choice was checked earlier and is already known to not be part of
+ # a dependency loop
+ return None
+
+ # choice._visited == 1, found a dependency loop. Return the choice as the
+ # first element in it.
+ return (choice,)
+
+
+def _found_dep_loop(loop, cur):
+ # Called "on the way back" when we know we have a loop
+
+ # Is the symbol/choice 'cur' where the loop started?
+ if cur is not loop[0]:
+ # Nope, it's just a part of the loop
+ return loop + (cur,)
+
+ # Yep, we have the entire loop. Throw an exception that shows it.
+
+ msg = "\nDependency loop\n" \
+ "===============\n\n"
+
+ for item in loop:
+ if item is not loop[0]:
+ msg += "...depends on "
+ if item.__class__ is Symbol and item.choice:
+ msg += "the choice symbol "
+
+ msg += "{}, with definition...\n\n{}\n\n" \
+ .format(_name_and_loc(item), item)
+
+ # Small wart: Since we reuse the already calculated
+ # Symbol/Choice._dependents sets for recursive dependency detection, we
+ # lose information on whether a dependency came from a 'select'/'imply'
+ # condition or e.g. a 'depends on'.
+ #
+ # This might cause selecting symbols to "disappear". For example,
+ # a symbol B having 'select A if C' gives a direct dependency from A to
+ # C, since it corresponds to a reverse dependency of B && C.
+ #
+ # Always print reverse dependencies for symbols that have them to make
+ # sure information isn't lost. I wonder if there's some neat way to
+ # improve this.
+
+ if item.__class__ is Symbol:
+ if item.rev_dep is not item.kconfig.n:
+ msg += "(select-related dependencies: {})\n\n" \
+ .format(expr_str(item.rev_dep))
+
+ if item.weak_rev_dep is not item.kconfig.n:
+ msg += "(imply-related dependencies: {})\n\n" \
+ .format(expr_str(item.rev_dep))
+
+ msg += "...depends again on {}".format(_name_and_loc(loop[0]))
+
+ raise KconfigError(msg)
+
+
+def _decoding_error(e, filename, macro_linenr=None):
+ # Gives the filename and context for UnicodeDecodeError's, which are a pain
+ # to debug otherwise. 'e' is the UnicodeDecodeError object.
+ #
+ # If the decoding error is for the output of a $(shell,...) command,
+ # macro_linenr holds the line number where it was run (the exact line
+ # number isn't available for decoding errors in files).
+
+ raise KconfigError(
+ "\n"
+ "Malformed {} in {}\n"
+ "Context: {}\n"
+ "Problematic data: {}\n"
+ "Reason: {}".format(
+ e.encoding,
+ "'{}'".format(filename) if macro_linenr is None else
+ "output from macro at {}:{}".format(filename, macro_linenr),
+ e.object[max(e.start - 40, 0):e.end + 40],
+ e.object[e.start:e.end],
+ e.reason))
+
+
+def _warn_verbose_deprecated(fn_name):
+ sys.stderr.write(
+ "Deprecation warning: {0}()'s 'verbose' argument has no effect. Since "
+ "Kconfiglib 12.0.0, the message is returned from {0}() instead, "
+ "and is always generated. Do e.g. print(kconf.{0}()) if you want to "
+ "want to show a message like \"Loaded configuration '.config'\" on "
+ "stdout. The old API required ugly hacks to reuse messages in "
+ "configuration interfaces.\n".format(fn_name))
+
+
+# Predefined preprocessor functions
+
+
+def _filename_fn(kconf, _):
+ return kconf.filename
+
+
+def _lineno_fn(kconf, _):
+ return str(kconf.linenr)
+
+
+def _info_fn(kconf, _, msg):
+ print("{}:{}: {}".format(kconf.filename, kconf.linenr, msg))
+
+ return ""
+
+
+def _warning_if_fn(kconf, _, cond, msg):
+ if cond == "y":
+ kconf._warn(msg, kconf.filename, kconf.linenr)
+
+ return ""
+
+
+def _error_if_fn(kconf, _, cond, msg):
+ if cond == "y":
+ raise KconfigError("{}:{}: {}".format(
+ kconf.filename, kconf.linenr, msg))
+
+ return ""
+
+
+def _shell_fn(kconf, _, command):
+ # Only import as needed, to save some startup time
+ import subprocess
+
+ stdout, stderr = subprocess.Popen(
+ command, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE
+ ).communicate()
+
+ if not _IS_PY2:
+ try:
+ stdout = stdout.decode(kconf._encoding)
+ stderr = stderr.decode(kconf._encoding)
+ except UnicodeDecodeError as e:
+ _decoding_error(e, kconf.filename, kconf.linenr)
+
+ if stderr:
+ kconf._warn("'{}' wrote to stderr: {}".format(
+ command, "\n".join(stderr.splitlines())),
+ kconf.filename, kconf.linenr)
+
+ # Universal newlines with splitlines() (to prevent e.g. stray \r's in
+ # command output on Windows), trailing newline removal, and
+ # newline-to-space conversion.
+ #
+ # On Python 3 versions before 3.6, it's not possible to specify the
+ # encoding when passing universal_newlines=True to Popen() (the 'encoding'
+ # parameter was added in 3.6), so we do this manual version instead.
+ return "\n".join(stdout.splitlines()).rstrip("\n").replace("\n", " ")
+
+#
+# Global constants
+#
+
+TRI_TO_STR = {
+ 0: "n",
+ 1: "m",
+ 2: "y",
+}
+
+STR_TO_TRI = {
+ "n": 0,
+ "m": 1,
+ "y": 2,
+}
+
+# Constant representing that there's no cached choice selection. This is
+# distinct from a cached None (no selection). Any object that's not None or a
+# Symbol will do. We test this with 'is'.
+_NO_CACHED_SELECTION = 0
+
+# Are we running on Python 2?
+_IS_PY2 = sys.version_info[0] < 3
+
+try:
+ _UNAME_RELEASE = os.uname()[2]
+except AttributeError:
+ # Only import as needed, to save some startup time
+ import platform
+ _UNAME_RELEASE = platform.uname()[2]
+
+# The token and type constants below are safe to test with 'is', which is a bit
+# faster (~30% faster on my machine, and a few % faster for total parsing
+# time), even without assuming Python's small integer optimization (which
+# caches small integer objects). The constants end up pointing to unique
+# integer objects, and since we consistently refer to them via the names below,
+# we always get the same object.
#
-# Internal global constants
+# Client code should use == though.
+
+# Tokens, with values 1, 2, ... . Avoiding 0 simplifies some checks by making
+# all tokens except empty strings truthy.
+(
+ _T_ALLNOCONFIG_Y,
+ _T_AND,
+ _T_BOOL,
+ _T_CHOICE,
+ _T_CLOSE_PAREN,
+ _T_COMMENT,
+ _T_CONFIG,
+ _T_DEFAULT,
+ _T_DEFCONFIG_LIST,
+ _T_DEF_BOOL,
+ _T_DEF_HEX,
+ _T_DEF_INT,
+ _T_DEF_STRING,
+ _T_DEF_TRISTATE,
+ _T_DEPENDS,
+ _T_ENDCHOICE,
+ _T_ENDIF,
+ _T_ENDMENU,
+ _T_ENV,
+ _T_EQUAL,
+ _T_GREATER,
+ _T_GREATER_EQUAL,
+ _T_HELP,
+ _T_HEX,
+ _T_IF,
+ _T_IMPLY,
+ _T_INT,
+ _T_LESS,
+ _T_LESS_EQUAL,
+ _T_MAINMENU,
+ _T_MENU,
+ _T_MENUCONFIG,
+ _T_MODULES,
+ _T_NOT,
+ _T_ON,
+ _T_OPEN_PAREN,
+ _T_OPTION,
+ _T_OPTIONAL,
+ _T_OR,
+ _T_ORSOURCE,
+ _T_OSOURCE,
+ _T_PROMPT,
+ _T_RANGE,
+ _T_RSOURCE,
+ _T_SELECT,
+ _T_SOURCE,
+ _T_STRING,
+ _T_TRISTATE,
+ _T_UNEQUAL,
+ _T_VISIBLE,
+) = range(1, 51)
+
+# Keyword to token map, with the get() method assigned directly as a small
+# optimization
+_get_keyword = {
+ "---help---": _T_HELP,
+ "allnoconfig_y": _T_ALLNOCONFIG_Y,
+ "bool": _T_BOOL,
+ "boolean": _T_BOOL,
+ "choice": _T_CHOICE,
+ "comment": _T_COMMENT,
+ "config": _T_CONFIG,
+ "def_bool": _T_DEF_BOOL,
+ "def_hex": _T_DEF_HEX,
+ "def_int": _T_DEF_INT,
+ "def_string": _T_DEF_STRING,
+ "def_tristate": _T_DEF_TRISTATE,
+ "default": _T_DEFAULT,
+ "defconfig_list": _T_DEFCONFIG_LIST,
+ "depends": _T_DEPENDS,
+ "endchoice": _T_ENDCHOICE,
+ "endif": _T_ENDIF,
+ "endmenu": _T_ENDMENU,
+ "env": _T_ENV,
+ "grsource": _T_ORSOURCE, # Backwards compatibility
+ "gsource": _T_OSOURCE, # Backwards compatibility
+ "help": _T_HELP,
+ "hex": _T_HEX,
+ "if": _T_IF,
+ "imply": _T_IMPLY,
+ "int": _T_INT,
+ "mainmenu": _T_MAINMENU,
+ "menu": _T_MENU,
+ "menuconfig": _T_MENUCONFIG,
+ "modules": _T_MODULES,
+ "on": _T_ON,
+ "option": _T_OPTION,
+ "optional": _T_OPTIONAL,
+ "orsource": _T_ORSOURCE,
+ "osource": _T_OSOURCE,
+ "prompt": _T_PROMPT,
+ "range": _T_RANGE,
+ "rsource": _T_RSOURCE,
+ "select": _T_SELECT,
+ "source": _T_SOURCE,
+ "string": _T_STRING,
+ "tristate": _T_TRISTATE,
+ "visible": _T_VISIBLE,
+}.get
+
+# The constants below match the value of the corresponding tokens to remove the
+# need for conversion
+
+# Node types
+MENU = _T_MENU
+COMMENT = _T_COMMENT
+
+# Expression types
+AND = _T_AND
+OR = _T_OR
+NOT = _T_NOT
+EQUAL = _T_EQUAL
+UNEQUAL = _T_UNEQUAL
+LESS = _T_LESS
+LESS_EQUAL = _T_LESS_EQUAL
+GREATER = _T_GREATER
+GREATER_EQUAL = _T_GREATER_EQUAL
+
+REL_TO_STR = {
+ EQUAL: "=",
+ UNEQUAL: "!=",
+ LESS: "<",
+ LESS_EQUAL: "<=",
+ GREATER: ">",
+ GREATER_EQUAL: ">=",
+}
+
+# Symbol/choice types. UNKNOWN is 0 (falsy) to simplify some checks.
+# Client code shouldn't rely on it though, as it was non-zero in
+# older versions.
+UNKNOWN = 0
+BOOL = _T_BOOL
+TRISTATE = _T_TRISTATE
+STRING = _T_STRING
+INT = _T_INT
+HEX = _T_HEX
+
+TYPE_TO_STR = {
+ UNKNOWN: "unknown",
+ BOOL: "bool",
+ TRISTATE: "tristate",
+ STRING: "string",
+ INT: "int",
+ HEX: "hex",
+}
+
+# Used in comparisons. 0 means the base is inferred from the format of the
+# string.
+_TYPE_TO_BASE = {
+ HEX: 16,
+ INT: 10,
+ STRING: 0,
+ UNKNOWN: 0,
+}
+
+# def_bool -> BOOL, etc.
+_DEF_TOKEN_TO_TYPE = {
+ _T_DEF_BOOL: BOOL,
+ _T_DEF_HEX: HEX,
+ _T_DEF_INT: INT,
+ _T_DEF_STRING: STRING,
+ _T_DEF_TRISTATE: TRISTATE,
+}
+
+# Tokens after which strings are expected. This is used to tell strings from
+# constant symbol references during tokenization, both of which are enclosed in
+# quotes.
#
+# Identifier-like lexemes ("missing quotes") are also treated as strings after
+# these tokens. _T_CHOICE is included to avoid symbols being registered for
+# named choices.
+_STRING_LEX = frozenset({
+ _T_BOOL,
+ _T_CHOICE,
+ _T_COMMENT,
+ _T_HEX,
+ _T_INT,
+ _T_MAINMENU,
+ _T_MENU,
+ _T_ORSOURCE,
+ _T_OSOURCE,
+ _T_PROMPT,
+ _T_RSOURCE,
+ _T_SOURCE,
+ _T_STRING,
+ _T_TRISTATE,
+})
+
+# Various sets for quick membership tests. Gives a single global lookup and
+# avoids creating temporary dicts/tuples.
+
+_TYPE_TOKENS = frozenset({
+ _T_BOOL,
+ _T_TRISTATE,
+ _T_INT,
+ _T_HEX,
+ _T_STRING,
+})
+
+_SOURCE_TOKENS = frozenset({
+ _T_SOURCE,
+ _T_RSOURCE,
+ _T_OSOURCE,
+ _T_ORSOURCE,
+})
+
+_REL_SOURCE_TOKENS = frozenset({
+ _T_RSOURCE,
+ _T_ORSOURCE,
+})
+
+# Obligatory (non-optional) sources
+_OBL_SOURCE_TOKENS = frozenset({
+ _T_SOURCE,
+ _T_RSOURCE,
+})
+
+_BOOL_TRISTATE = frozenset({
+ BOOL,
+ TRISTATE,
+})
+
+_BOOL_TRISTATE_UNKNOWN = frozenset({
+ BOOL,
+ TRISTATE,
+ UNKNOWN,
+})
+
+_INT_HEX = frozenset({
+ INT,
+ HEX,
+})
+
+_SYMBOL_CHOICE = frozenset({
+ Symbol,
+ Choice,
+})
+
+_MENU_COMMENT = frozenset({
+ MENU,
+ COMMENT,
+})
+
+_EQUAL_UNEQUAL = frozenset({
+ EQUAL,
+ UNEQUAL,
+})
+
+_RELATIONS = frozenset({
+ EQUAL,
+ UNEQUAL,
+ LESS,
+ LESS_EQUAL,
+ GREATER,
+ GREATER_EQUAL,
+})
+
+# Helper functions for getting compiled regular expressions, with the needed
+# matching function returned directly as a small optimization.
+#
+# Use ASCII regex matching on Python 3. It's already the default on Python 2.
+
+
+def _re_match(regex):
+ return re.compile(regex, 0 if _IS_PY2 else re.ASCII).match
+
+
+def _re_search(regex):
+ return re.compile(regex, 0 if _IS_PY2 else re.ASCII).search
+
+
+# Various regular expressions used during parsing
+
+# The initial token on a line. Also eats leading and trailing whitespace, so
+# that we can jump straight to the next token (or to the end of the line if
+# there is only one token).
+#
+# This regex will also fail to match for empty lines and comment lines.
+#
+# '$' is included to detect preprocessor variable assignments with macro
+# expansions in the left-hand side.
+_command_match = _re_match(r"\s*([A-Za-z0-9_$-]+)\s*")
+
+# An identifier/keyword after the first token. Also eats trailing whitespace.
+# '$' is included to detect identifiers containing macro expansions.
+_id_keyword_match = _re_match(r"([A-Za-z0-9_$/.-]+)\s*")
+
+# A fragment in the left-hand side of a preprocessor variable assignment. These
+# are the portions between macro expansions ($(foo)). Macros are supported in
+# the LHS (variable name).
+_assignment_lhs_fragment_match = _re_match("[A-Za-z0-9_-]*")
+
+# The assignment operator and value (right-hand side) in a preprocessor
+# variable assignment
+_assignment_rhs_match = _re_match(r"\s*(=|:=|\+=)\s*(.*)")
+
+# Special characters/strings while expanding a macro (')', ',', and '$(')
+_macro_special_search = _re_search(r"\)|,|\$\(")
+
+# Special characters/strings while expanding a string (quotes, '\', and '$(')
+_string_special_search = _re_search(r'"|\'|\\|\$\(')
+
+# Special characters/strings while expanding a symbol name. Also includes
+# end-of-line, in case the macro is the last thing on the line.
+_name_special_search = _re_search(r'[^A-Za-z0-9_$/.-]|\$\(|$')
-# Tokens
-(T_AND, T_OR, T_NOT,
- T_OPEN_PAREN, T_CLOSE_PAREN,
- T_EQUAL, T_UNEQUAL,
- T_MAINMENU, T_MENU, T_ENDMENU,
- T_SOURCE, T_CHOICE, T_ENDCHOICE,
- T_COMMENT, T_CONFIG, T_MENUCONFIG,
- T_HELP, T_IF, T_ENDIF, T_DEPENDS, T_ON,
- T_OPTIONAL, T_PROMPT, T_DEFAULT,
- T_BOOL, T_TRISTATE, T_HEX, T_INT, T_STRING,
- T_DEF_BOOL, T_DEF_TRISTATE,
- T_SELECT, T_IMPLY, T_RANGE, T_OPTION, T_ALLNOCONFIG_Y, T_ENV,
- T_DEFCONFIG_LIST, T_MODULES, T_VISIBLE) = range(40)
-
-# The leading underscore before the function assignments below prevent pydoc
-# from listing them. The constants could be hidden too, but they're fairly
-# obviously internal anyway, so don't bother spamming the code.
-
-# Keyword to token map. Note that the get() method is assigned directly as a
-# small optimization.
-_get_keyword = \
- {"mainmenu": T_MAINMENU, "menu": T_MENU, "endmenu": T_ENDMENU,
- "endif": T_ENDIF, "endchoice": T_ENDCHOICE, "source": T_SOURCE,
- "choice": T_CHOICE, "config": T_CONFIG, "comment": T_COMMENT,
- "menuconfig": T_MENUCONFIG, "help": T_HELP, "if": T_IF,
- "depends": T_DEPENDS, "on": T_ON, "optional": T_OPTIONAL,
- "prompt": T_PROMPT, "default": T_DEFAULT, "bool": T_BOOL, "boolean": T_BOOL,
- "tristate": T_TRISTATE, "int": T_INT, "hex": T_HEX, "def_bool": T_DEF_BOOL,
- "def_tristate": T_DEF_TRISTATE, "string": T_STRING, "select": T_SELECT,
- "imply" : T_IMPLY, "range": T_RANGE, "option": T_OPTION,
- "allnoconfig_y": T_ALLNOCONFIG_Y, "env": T_ENV,
- "defconfig_list": T_DEFCONFIG_LIST, "modules": T_MODULES,
- "visible": T_VISIBLE}.get
-
-# Strings to use for True and False
-BOOL_STR = {False: "false", True: "true"}
-
-# Tokens after which identifier-like lexemes are treated as strings. T_CHOICE
-# is included to avoid symbols being registered for named choices.
-STRING_LEX = frozenset((T_BOOL, T_TRISTATE, T_INT, T_HEX, T_STRING, T_CHOICE,
- T_PROMPT, T_MENU, T_COMMENT, T_SOURCE, T_MAINMENU))
-
-# Matches the initial token on a line; see _tokenize(). Also eats trailing
-# whitespace as an optimization.
-_initial_token_re_match = re.compile(r"[^\w]*(\w+)\s*").match
-
-# Matches an identifier/keyword optionally preceded by whitespace. Also eats
-# trailing whitespace as an optimization.
-_id_keyword_re_match = re.compile(r"\s*([\w./-]+)\s*").match
-
-# Regular expression for finding $-references to symbols in strings
-_sym_ref_re_search = re.compile(r"\$[A-Za-z0-9_]+").search
-
-# Integers representing symbol types
-UNKNOWN, BOOL, TRISTATE, STRING, HEX, INT = range(6)
-
-# Strings to use for types
-TYPENAME = {UNKNOWN: "unknown", BOOL: "bool", TRISTATE: "tristate",
- STRING: "string", HEX: "hex", INT: "int"}
-
-# Token to type mapping
-TOKEN_TO_TYPE = {T_BOOL: BOOL, T_TRISTATE: TRISTATE, T_STRING: STRING,
- T_INT: INT, T_HEX: HEX}
-
-# Default values for symbols of different types (the value the symbol gets if
-# it is not assigned a user value and none of its 'default' clauses kick in)
-DEFAULT_VALUE = {BOOL: "n", TRISTATE: "n", STRING: "", INT: "", HEX: ""}
-
-# Indicates that no item is selected in a choice statement
-NO_SELECTION = 0
-
-# Integers representing expression types
-AND, OR, NOT, EQUAL, UNEQUAL = range(5)
-
-# Map from tristate values to integers
-TRI_TO_INT = {"n": 0, "m": 1, "y": 2}
-
-# Printing-related stuff
-
-OP_TO_STR = {AND: " && ", OR: " || ", EQUAL: " = ", UNEQUAL: " != "}
-PRECEDENCE = {OR: 0, AND: 1, NOT: 2}
+# A valid right-hand side for an assignment to a string symbol in a .config
+# file, including escaped characters. Extracts the contents.
+_conf_string_match = _re_match(r'"((?:[^\\"]|\\.)*)"')
projects / u-boot.git / commitdiff
