548 lines
18 KiB
Python
548 lines
18 KiB
Python
#
|
|
# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007 The SCons Foundation
|
|
#
|
|
# Permission is hereby granted, free of charge, to any person obtaining
|
|
# a copy of this software and associated documentation files (the
|
|
# "Software"), to deal in the Software without restriction, including
|
|
# without limitation the rights to use, copy, modify, merge, publish,
|
|
# distribute, sublicense, and/or sell copies of the Software, and to
|
|
# permit persons to whom the Software is furnished to do so, subject to
|
|
# the following conditions:
|
|
#
|
|
# The above copyright notice and this permission notice shall be included
|
|
# in all copies or substantial portions of the Software.
|
|
#
|
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
|
|
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
|
|
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
#
|
|
|
|
__revision__ = "src/engine/SCons/cpp.py 2523 2007/12/12 09:37:41 knight"
|
|
|
|
__doc__ = """
|
|
SCons C Pre-Processor module
|
|
"""
|
|
|
|
import SCons.compat
|
|
|
|
import os
|
|
import re
|
|
import string
|
|
|
|
#
|
|
# First "subsystem" of regular expressions that we set up:
|
|
#
|
|
# Stuff to turn the C preprocessor directives in a file's contents into
|
|
# a list of tuples that we can process easily.
|
|
#
|
|
|
|
# A table of regular expressions that fetch the arguments from the rest of
|
|
# a C preprocessor line. Different directives have different arguments
|
|
# that we want to fetch, using the regular expressions to which the lists
|
|
# of preprocessor directives map.
|
|
cpp_lines_dict = {
|
|
# Fetch the rest of a #if/#elif/#ifdef/#ifndef/#import/#include/
|
|
# #include_next line as one argument.
|
|
('if', 'elif', 'ifdef', 'ifndef', 'import', 'include', 'include_next',)
|
|
: '\s+(.+)',
|
|
|
|
# We don't care what comes after a #else or #endif line.
|
|
('else', 'endif',) : '',
|
|
|
|
# Fetch three arguments from a #define line:
|
|
# 1) The #defined keyword.
|
|
# 2) The optional parentheses and arguments (if it's a function-like
|
|
# macro, '' if it's not).
|
|
# 3) The expansion value.
|
|
('define',) : '\s+([_A-Za-z][_A-Za-z0-9_]+)(\([^)]*\))?\s*(.*)',
|
|
|
|
# Fetch the #undefed keyword from a #undef line.
|
|
('undef',) : '\s+([_A-Za-z][A-Za-z0-9_]+)',
|
|
}
|
|
|
|
# Create a table that maps each individual C preprocessor directive to
|
|
# the corresponding compiled regular expression that fetches the arguments
|
|
# we care about.
|
|
Table = {}
|
|
for op_list, expr in cpp_lines_dict.items():
|
|
e = re.compile(expr)
|
|
for op in op_list:
|
|
Table[op] = e
|
|
del e
|
|
del op
|
|
del op_list
|
|
|
|
# Create a list of the expressions we'll use to match all of the
|
|
# preprocessor directives. These are the same as the directives
|
|
# themselves *except* that we must use a negative lookahead assertion
|
|
# when matching "if" so it doesn't match the "if" in "ifdef."
|
|
override = {
|
|
'if' : 'if(?!def)',
|
|
}
|
|
l = map(lambda x, o=override: o.get(x, x), Table.keys())
|
|
|
|
|
|
# Turn the list of expressions into one big honkin' regular expression
|
|
# that will match all the preprocessor lines at once. This will return
|
|
# a list of tuples, one for each preprocessor line. The preprocessor
|
|
# directive will be the first element in each tuple, and the rest of
|
|
# the line will be the second element.
|
|
e = '^\s*#\s*(' + string.join(l, '|') + ')(.*)$'
|
|
|
|
# And last but not least, compile the expression.
|
|
CPP_Expression = re.compile(e, re.M)
|
|
|
|
|
|
|
|
|
|
#
|
|
# Second "subsystem" of regular expressions that we set up:
|
|
#
|
|
# Stuff to translate a C preprocessor expression (as found on a #if or
|
|
# #elif line) into an equivalent Python expression that we can eval().
|
|
#
|
|
|
|
# A dictionary that maps the C representation of Boolean operators
|
|
# to their Python equivalents.
|
|
CPP_to_Python_Ops_Dict = {
|
|
'!' : ' not ',
|
|
'!=' : ' != ',
|
|
'&&' : ' and ',
|
|
'||' : ' or ',
|
|
'?' : ' and ',
|
|
':' : ' or ',
|
|
'\r' : '',
|
|
}
|
|
|
|
CPP_to_Python_Ops_Sub = lambda m, d=CPP_to_Python_Ops_Dict: d[m.group(0)]
|
|
|
|
# We have to sort the keys by length so that longer expressions
|
|
# come *before* shorter expressions--in particular, "!=" must
|
|
# come before "!" in the alternation. Without this, the Python
|
|
# re module, as late as version 2.2.2, empirically matches the
|
|
# "!" in "!=" first, instead of finding the longest match.
|
|
# What's up with that?
|
|
l = CPP_to_Python_Ops_Dict.keys()
|
|
l.sort(lambda a, b: cmp(len(b), len(a)))
|
|
|
|
# Turn the list of keys into one regular expression that will allow us
|
|
# to substitute all of the operators at once.
|
|
expr = string.join(map(re.escape, l), '|')
|
|
|
|
# ...and compile the expression.
|
|
CPP_to_Python_Ops_Expression = re.compile(expr)
|
|
|
|
# A separate list of expressions to be evaluated and substituted
|
|
# sequentially, not all at once.
|
|
CPP_to_Python_Eval_List = [
|
|
['defined\s+(\w+)', '__dict__.has_key("\\1")'],
|
|
['defined\s*\((\w+)\)', '__dict__.has_key("\\1")'],
|
|
['/\*.*\*/', ''],
|
|
['/\*.*', ''],
|
|
['//.*', ''],
|
|
['(0x[0-9A-Fa-f]*)[UL]+', '\\1L'],
|
|
]
|
|
|
|
# Replace the string representations of the regular expressions in the
|
|
# list with compiled versions.
|
|
for l in CPP_to_Python_Eval_List:
|
|
l[0] = re.compile(l[0])
|
|
|
|
# Wrap up all of the above into a handy function.
|
|
def CPP_to_Python(s):
|
|
"""
|
|
Converts a C pre-processor expression into an equivalent
|
|
Python expression that can be evaluated.
|
|
"""
|
|
s = CPP_to_Python_Ops_Expression.sub(CPP_to_Python_Ops_Sub, s)
|
|
for expr, repl in CPP_to_Python_Eval_List:
|
|
s = expr.sub(repl, s)
|
|
return s
|
|
|
|
|
|
|
|
del expr
|
|
del l
|
|
del override
|
|
|
|
|
|
|
|
class FunctionEvaluator:
|
|
"""
|
|
Handles delayed evaluation of a #define function call.
|
|
"""
|
|
def __init__(self, name, args, expansion):
|
|
"""
|
|
Squirrels away the arguments and expansion value of a #define
|
|
macro function for later evaluation when we must actually expand
|
|
a value that uses it.
|
|
"""
|
|
self.name = name
|
|
self.args = function_arg_separator.split(args)
|
|
self.expansion = string.split(expansion, '##')
|
|
def __call__(self, *values):
|
|
"""
|
|
Evaluates the expansion of a #define macro function called
|
|
with the specified values.
|
|
"""
|
|
if len(self.args) != len(values):
|
|
raise ValueError, "Incorrect number of arguments to `%s'" % self.name
|
|
# Create a dictionary that maps the macro arguments to the
|
|
# corresponding values in this "call." We'll use this when we
|
|
# eval() the expansion so that arguments will get expanded to
|
|
# the right values.
|
|
locals = {}
|
|
for k, v in zip(self.args, values):
|
|
locals[k] = v
|
|
|
|
parts = []
|
|
for s in self.expansion:
|
|
if not s in self.args:
|
|
s = repr(s)
|
|
parts.append(s)
|
|
statement = string.join(parts, ' + ')
|
|
|
|
return eval(statement, globals(), locals)
|
|
|
|
|
|
|
|
# Find line continuations.
|
|
line_continuations = re.compile('\\\\\r?\n')
|
|
|
|
# Search for a "function call" macro on an expansion. Returns the
|
|
# two-tuple of the "function" name itself, and a string containing the
|
|
# arguments within the call parentheses.
|
|
function_name = re.compile('(\S+)\(([^)]*)\)')
|
|
|
|
# Split a string containing comma-separated function call arguments into
|
|
# the separate arguments.
|
|
function_arg_separator = re.compile(',\s*')
|
|
|
|
|
|
|
|
class PreProcessor:
|
|
"""
|
|
The main workhorse class for handling C pre-processing.
|
|
"""
|
|
def __init__(self, current='.', cpppath=[], dict={}, all=0):
|
|
global Table
|
|
|
|
self.searchpath = {
|
|
'"' : [current] + cpppath,
|
|
'<' : cpppath + [current],
|
|
}
|
|
|
|
# Initialize our C preprocessor namespace for tracking the
|
|
# values of #defined keywords. We use this namespace to look
|
|
# for keywords on #ifdef/#ifndef lines, and to eval() the
|
|
# expressions on #if/#elif lines (after massaging them from C to
|
|
# Python).
|
|
self.cpp_namespace = dict.copy()
|
|
self.cpp_namespace['__dict__'] = self.cpp_namespace
|
|
|
|
if all:
|
|
self.do_include = self.all_include
|
|
|
|
# For efficiency, a dispatch table maps each C preprocessor
|
|
# directive (#if, #define, etc.) to the method that should be
|
|
# called when we see it. We accomodate state changes (#if,
|
|
# #ifdef, #ifndef) by pushing the current dispatch table on a
|
|
# stack and changing what method gets called for each relevant
|
|
# directive we might see next at this level (#else, #elif).
|
|
# #endif will simply pop the stack.
|
|
d = {}
|
|
for op in Table.keys():
|
|
d[op] = getattr(self, 'do_' + op)
|
|
self.default_table = d
|
|
|
|
# Controlling methods.
|
|
|
|
def tupleize(self, contents):
|
|
"""
|
|
Turns the contents of a file into a list of easily-processed
|
|
tuples describing the CPP lines in the file.
|
|
|
|
The first element of each tuple is the line's preprocessor
|
|
directive (#if, #include, #define, etc., minus the initial '#').
|
|
The remaining elements are specific to the type of directive, as
|
|
pulled apart by the regular expression.
|
|
"""
|
|
global CPP_Expression, Table
|
|
contents = line_continuations.sub('', contents)
|
|
cpp_tuples = CPP_Expression.findall(contents)
|
|
return map(lambda m, t=Table:
|
|
(m[0],) + t[m[0]].match(m[1]).groups(),
|
|
cpp_tuples)
|
|
|
|
def __call__(self, contents):
|
|
"""
|
|
Pre-processes a file contents.
|
|
|
|
This is the main entry point, which
|
|
"""
|
|
self.stack = []
|
|
self.dispatch_table = self.default_table.copy()
|
|
self.tuples = self.tupleize(contents)
|
|
|
|
self.result = []
|
|
while self.tuples:
|
|
t = self.tuples.pop(0)
|
|
# Uncomment to see the list of tuples being processed (e.g.,
|
|
# to validate the CPP lines are being translated correctly).
|
|
#print t
|
|
self.dispatch_table[t[0]](t)
|
|
|
|
return self.result
|
|
|
|
# Dispatch table stack manipulation methods.
|
|
|
|
def save(self):
|
|
"""
|
|
Pushes the current dispatch table on the stack and re-initializes
|
|
the current dispatch table to the default.
|
|
"""
|
|
self.stack.append(self.dispatch_table)
|
|
self.dispatch_table = self.default_table.copy()
|
|
|
|
def restore(self):
|
|
"""
|
|
Pops the previous dispatch table off the stack and makes it the
|
|
current one.
|
|
"""
|
|
try: self.dispatch_table = self.stack.pop()
|
|
except IndexError: pass
|
|
|
|
# Utility methods.
|
|
|
|
def do_nothing(self, t):
|
|
"""
|
|
Null method for when we explicitly want the action for a
|
|
specific preprocessor directive to do nothing.
|
|
"""
|
|
pass
|
|
|
|
def eval_expression(self, t):
|
|
"""
|
|
Evaluates a C preprocessor expression.
|
|
|
|
This is done by converting it to a Python equivalent and
|
|
eval()ing it in the C preprocessor namespace we use to
|
|
track #define values.
|
|
"""
|
|
t = CPP_to_Python(string.join(t[1:]))
|
|
try: return eval(t, self.cpp_namespace)
|
|
except (NameError, TypeError): return 0
|
|
|
|
def find_include_file(self, t):
|
|
"""
|
|
Finds the #include file for a given preprocessor tuple.
|
|
"""
|
|
fname = t[2]
|
|
for d in self.searchpath[t[1]]:
|
|
f = os.path.join(d, fname)
|
|
if os.path.isfile(f):
|
|
return f
|
|
return None
|
|
|
|
# Start and stop processing include lines.
|
|
|
|
def start_handling_includes(self, t=None):
|
|
"""
|
|
Causes the PreProcessor object to start processing #import,
|
|
#include and #include_next lines.
|
|
|
|
This method will be called when a #if, #ifdef, #ifndef or #elif
|
|
evaluates True, or when we reach the #else in a #if, #ifdef,
|
|
#ifndef or #elif block where a condition already evaluated
|
|
False.
|
|
|
|
"""
|
|
d = self.dispatch_table
|
|
d['import'] = self.do_import
|
|
d['include'] = self.do_include
|
|
d['include_next'] = self.do_include
|
|
|
|
def stop_handling_includes(self, t=None):
|
|
"""
|
|
Causes the PreProcessor object to stop processing #import,
|
|
#include and #include_next lines.
|
|
|
|
This method will be called when a #if, #ifdef, #ifndef or #elif
|
|
evaluates False, or when we reach the #else in a #if, #ifdef,
|
|
#ifndef or #elif block where a condition already evaluated True.
|
|
"""
|
|
d = self.dispatch_table
|
|
d['import'] = self.do_nothing
|
|
d['include'] = self.do_nothing
|
|
d['include_next'] = self.do_nothing
|
|
|
|
# Default methods for handling all of the preprocessor directives.
|
|
# (Note that what actually gets called for a given directive at any
|
|
# point in time is really controlled by the dispatch_table.)
|
|
|
|
def _do_if_else_condition(self, condition):
|
|
"""
|
|
Common logic for evaluating the conditions on #if, #ifdef and
|
|
#ifndef lines.
|
|
"""
|
|
self.save()
|
|
d = self.dispatch_table
|
|
if condition:
|
|
self.start_handling_includes()
|
|
d['elif'] = self.stop_handling_includes
|
|
d['else'] = self.stop_handling_includes
|
|
else:
|
|
self.stop_handling_includes()
|
|
d['elif'] = self.do_elif
|
|
d['else'] = self.start_handling_includes
|
|
|
|
def do_ifdef(self, t):
|
|
"""
|
|
Default handling of a #ifdef line.
|
|
"""
|
|
self._do_if_else_condition(self.cpp_namespace.has_key(t[1]))
|
|
|
|
def do_ifndef(self, t):
|
|
"""
|
|
Default handling of a #ifndef line.
|
|
"""
|
|
self._do_if_else_condition(not self.cpp_namespace.has_key(t[1]))
|
|
|
|
def do_if(self, t):
|
|
"""
|
|
Default handling of a #if line.
|
|
"""
|
|
self._do_if_else_condition(self.eval_expression(t))
|
|
|
|
def do_elif(self, t):
|
|
"""
|
|
Default handling of a #elif line.
|
|
"""
|
|
d = self.dispatch_table
|
|
if self.eval_expression(t):
|
|
self.start_handling_includes()
|
|
d['elif'] = self.stop_handling_includes
|
|
d['else'] = self.stop_handling_includes
|
|
|
|
def do_else(self, t):
|
|
"""
|
|
Default handling of a #else line.
|
|
"""
|
|
pass
|
|
|
|
def do_endif(self, t):
|
|
"""
|
|
Default handling of a #endif line.
|
|
"""
|
|
self.restore()
|
|
|
|
def do_define(self, t):
|
|
"""
|
|
Default handling of a #define line.
|
|
"""
|
|
_, name, args, expansion = t
|
|
try:
|
|
expansion = int(expansion)
|
|
except (TypeError, ValueError):
|
|
pass
|
|
if args:
|
|
evaluator = FunctionEvaluator(name, args[1:-1], expansion)
|
|
self.cpp_namespace[name] = evaluator
|
|
else:
|
|
self.cpp_namespace[name] = expansion
|
|
|
|
def do_undef(self, t):
|
|
"""
|
|
Default handling of a #undef line.
|
|
"""
|
|
try: del self.cpp_namespace[t[1]]
|
|
except KeyError: pass
|
|
|
|
def do_import(self, t):
|
|
"""
|
|
Default handling of a #import line.
|
|
"""
|
|
# XXX finish this -- maybe borrow/share logic from do_include()...?
|
|
pass
|
|
|
|
def do_include(self, t):
|
|
"""
|
|
Default handling of a #include line.
|
|
"""
|
|
t = self.resolve_include(t)
|
|
include_file = self.find_include_file(t)
|
|
if include_file:
|
|
#print "include_file =", include_file
|
|
self.result.append(include_file)
|
|
contents = open(include_file).read()
|
|
new_tuples = self.tupleize(contents)
|
|
self.tuples[:] = new_tuples + self.tuples
|
|
|
|
# Date: Tue, 22 Nov 2005 20:26:09 -0500
|
|
# From: Stefan Seefeld <seefeld@sympatico.ca>
|
|
#
|
|
# By the way, #include_next is not the same as #include. The difference
|
|
# being that #include_next starts its search in the path following the
|
|
# path that let to the including file. In other words, if your system
|
|
# include paths are ['/foo', '/bar'], and you are looking at a header
|
|
# '/foo/baz.h', it might issue an '#include_next <baz.h>' which would
|
|
# correctly resolve to '/bar/baz.h' (if that exists), but *not* see
|
|
# '/foo/baz.h' again. See http://www.delorie.com/gnu/docs/gcc/cpp_11.html
|
|
# for more reasoning.
|
|
#
|
|
# I have no idea in what context 'import' might be used.
|
|
|
|
# XXX is #include_next really the same as #include ?
|
|
do_include_next = do_include
|
|
|
|
# Utility methods for handling resolution of include files.
|
|
|
|
def resolve_include(self, t):
|
|
"""Resolve a tuple-ized #include line.
|
|
|
|
This handles recursive expansion of values without "" or <>
|
|
surrounding the name until an initial " or < is found, to handle
|
|
#include FILE
|
|
where FILE is a #define somewhere else.
|
|
"""
|
|
s = t[1]
|
|
while not s[0] in '<"':
|
|
#print "s =", s
|
|
try:
|
|
s = self.cpp_namespace[s]
|
|
except KeyError:
|
|
m = function_name.search(s)
|
|
s = self.cpp_namespace[m.group(1)]
|
|
if callable(s):
|
|
args = function_arg_separator.split(m.group(2))
|
|
s = apply(s, args)
|
|
if not s:
|
|
return None
|
|
return (t[0], s[0], s[1:-1])
|
|
|
|
def all_include(self, t):
|
|
"""
|
|
"""
|
|
self.result.append(self.resolve_include(t))
|
|
|
|
class DumbPreProcessor(PreProcessor):
|
|
"""A preprocessor that ignores all #if/#elif/#else/#endif directives
|
|
and just reports back *all* of the #include files (like the classic
|
|
SCons scanner did).
|
|
|
|
This is functionally equivalent to using a regular expression to
|
|
find all of the #include lines, only slower. It exists mainly as
|
|
an example of how the main PreProcessor class can be sub-classed
|
|
to tailor its behavior.
|
|
"""
|
|
def __init__(self, *args, **kw):
|
|
apply(PreProcessor.__init__, (self,)+args, kw)
|
|
d = self.default_table
|
|
for func in ['if', 'elif', 'else', 'endif', 'ifdef', 'ifndef']:
|
|
d[func] = d[func] = self.do_nothing
|
|
|
|
del __revision__
|