mirror of
https://gitlab.com/ita1024/waf.git
synced 2024-12-01 14:31:55 +01:00
1050 lines
27 KiB
Python
1050 lines
27 KiB
Python
#!/usr/bin/env python
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# encoding: utf-8
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# Thomas Nagy, 2006-2010 (ita)
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"""
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C/C++ preprocessor for finding dependencies
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Reasons for using the Waf preprocessor by default
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#. Some c/c++ extensions (Qt) require a custom preprocessor for obtaining the dependencies (.moc files)
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#. Not all compilers provide .d files for obtaining the dependencies (portability)
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#. A naive file scanner will not catch the constructs such as "#include foo()"
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#. A naive file scanner will catch unnecessary dependencies (change an unused header -> recompile everything)
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Regarding the speed concerns:
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* the preprocessing is performed only when files must be compiled
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* the macros are evaluated only for #if/#elif/#include
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* system headers are not scanned by default
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Now if you do not want the Waf preprocessor, the tool +gccdeps* uses the .d files produced
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during the compilation to track the dependencies (useful when used with the boost libraries).
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It only works with gcc >= 4.4 though.
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A dumb preprocessor is also available in the tool *c_dumbpreproc*
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"""
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# TODO: more varargs, pragma once
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import re, string, traceback
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from waflib import Logs, Utils, Errors
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from waflib.Logs import debug, error
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try:
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from functools import lru_cache
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except ImportError:
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def lru_cache(*k, **kw):
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def f(fun):
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return fun
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return f
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class PreprocError(Errors.WafError):
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pass
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POPFILE = '-'
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"Constant representing a special token used in :py:meth:`waflib.Tools.c_preproc.c_parser.start` iteration to switch to a header read previously"
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recursion_limit = 150
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"Limit on the amount of files to read in the dependency scanner"
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go_absolute = False
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"Set to True to track headers on files in /usr/include, else absolute paths are ignored (but it becomes very slow)"
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standard_includes = ['/usr/include']
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if Utils.is_win32:
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standard_includes = []
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use_trigraphs = 0
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"""Apply trigraph rules (False by default)"""
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strict_quotes = 0
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"""Reserve the "#include <>" quotes for system includes (do not search for those includes). False by default."""
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g_optrans = {
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'not':'!',
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'not_eq':'!',
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'and':'&&',
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'and_eq':'&=',
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'or':'||',
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'or_eq':'|=',
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'xor':'^',
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'xor_eq':'^=',
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'bitand':'&',
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'bitor':'|',
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'compl':'~',
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}
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"""Operators such as and/or/xor for c++. Set an empty dict to disable."""
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# ignore #warning and #error
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re_lines = re.compile(
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'^[ \t]*(#|%:)[ \t]*(ifdef|ifndef|if|else|elif|endif|include|import|define|undef|pragma)[ \t]*(.*)\r*$',
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re.IGNORECASE | re.MULTILINE)
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"""Match #include lines"""
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re_mac = re.compile("^[a-zA-Z_]\w*")
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"""Match macro definitions"""
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re_fun = re.compile('^[a-zA-Z_][a-zA-Z0-9_]*[(]')
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"""Match macro functions"""
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re_pragma_once = re.compile('^\s*once\s*', re.IGNORECASE)
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"""Match #pragma once statements"""
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re_nl = re.compile('\\\\\r*\n', re.MULTILINE)
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"""Match newlines"""
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re_cpp = re.compile(r'//.*?$|/\*.*?\*/|\'(?:\\.|[^\\\'])*\'|"(?:\\.|[^\\"])*"', re.DOTALL | re.MULTILINE )
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"""Filter C/C++ comments"""
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trig_def = [('??'+a, b) for a, b in zip("=-/!'()<>", r'#~\|^[]{}')]
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"""Trigraph definitions"""
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chr_esc = {'0':0, 'a':7, 'b':8, 't':9, 'n':10, 'f':11, 'v':12, 'r':13, '\\':92, "'":39}
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"""Escape characters"""
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NUM = 'i'
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"""Number token"""
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OP = 'O'
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"""Operator token"""
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IDENT = 'T'
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"""Identifier token"""
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STR = 's'
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"""String token"""
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CHAR = 'c'
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"""Character token"""
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tok_types = [NUM, STR, IDENT, OP]
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"""Token types"""
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exp_types = [
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r"""0[xX](?P<hex>[a-fA-F0-9]+)(?P<qual1>[uUlL]*)|L*?'(?P<char>(\\.|[^\\'])+)'|(?P<n1>\d+)[Ee](?P<exp0>[+-]*?\d+)(?P<float0>[fFlL]*)|(?P<n2>\d*\.\d+)([Ee](?P<exp1>[+-]*?\d+))?(?P<float1>[fFlL]*)|(?P<n4>\d+\.\d*)([Ee](?P<exp2>[+-]*?\d+))?(?P<float2>[fFlL]*)|(?P<oct>0*)(?P<n0>\d+)(?P<qual2>[uUlL]*)""",
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r'L?"([^"\\]|\\.)*"',
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r'[a-zA-Z_]\w*',
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r'%:%:|<<=|>>=|\.\.\.|<<|<%|<:|<=|>>|>=|\+\+|\+=|--|->|-=|\*=|/=|%:|%=|%>|==|&&|&=|\|\||\|=|\^=|:>|!=|##|[\(\)\{\}\[\]<>\?\|\^\*\+&=:!#;,%/\-\?\~\.]',
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]
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"""Expression types"""
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re_clexer = re.compile('|'.join(["(?P<%s>%s)" % (name, part) for name, part in zip(tok_types, exp_types)]), re.M)
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"""Match expressions into tokens"""
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accepted = 'a'
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"""Parser state is *accepted*"""
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ignored = 'i'
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"""Parser state is *ignored*, for example preprocessor lines in an #if 0 block"""
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undefined = 'u'
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"""Parser state is *undefined* at the moment"""
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skipped = 's'
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"""Parser state is *skipped*, for example preprocessor lines in a #elif 0 block"""
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def repl(m):
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"""Replace function used with :py:attr:`waflib.Tools.c_preproc.re_cpp`"""
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s = m.group(0)
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if s.startswith('/'):
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return ' '
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return s
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def filter_comments(filename):
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"""
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Filter the comments from a c/h file, and return the preprocessor lines.
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The regexps :py:attr:`waflib.Tools.c_preproc.re_cpp`, :py:attr:`waflib.Tools.c_preproc.re_nl` and :py:attr:`waflib.Tools.c_preproc.re_lines` are used internally.
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:return: the preprocessor directives as a list of (keyword, line)
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:rtype: a list of string pairs
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"""
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# return a list of tuples : keyword, line
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code = Utils.readf(filename)
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if use_trigraphs:
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for (a, b) in trig_def: code = code.split(a).join(b)
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code = re_nl.sub('', code)
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code = re_cpp.sub(repl, code)
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return [(m.group(2), m.group(3)) for m in re.finditer(re_lines, code)]
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prec = {}
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"""
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Operator precendence rules required for parsing expressions of the form::
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#if 1 && 2 != 0
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"""
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ops = ['* / %', '+ -', '<< >>', '< <= >= >', '== !=', '& | ^', '&& ||', ',']
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for x, syms in enumerate(ops):
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for u in syms.split():
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prec[u] = x
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def trimquotes(s):
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"""
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Remove the single quotes around an expression::
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trimquotes("'test'") == "test"
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:param s: expression to transform
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:type s: string
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:rtype: string
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"""
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if not s: return ''
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s = s.rstrip()
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if s[0] == "'" and s[-1] == "'": return s[1:-1]
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return s
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def reduce_nums(val_1, val_2, val_op):
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"""
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Apply arithmetic rules to compute a result
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:param val1: input parameter
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:type val1: int or string
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:param val2: input parameter
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:type val2: int or string
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:param val_op: C operator in *+*, */*, *-*, etc
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:type val_op: string
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:rtype: int
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"""
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#print val_1, val_2, val_op
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# now perform the operation, make certain a and b are numeric
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try: a = 0 + val_1
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except TypeError: a = int(val_1)
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try: b = 0 + val_2
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except TypeError: b = int(val_2)
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d = val_op
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if d == '%': c = a%b
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elif d=='+': c = a+b
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elif d=='-': c = a-b
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elif d=='*': c = a*b
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elif d=='/': c = a/b
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elif d=='^': c = a^b
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elif d=='==': c = int(a == b)
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elif d=='|' or d == 'bitor': c = a|b
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elif d=='||' or d == 'or' : c = int(a or b)
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elif d=='&' or d == 'bitand': c = a&b
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elif d=='&&' or d == 'and': c = int(a and b)
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elif d=='!=' or d == 'not_eq': c = int(a != b)
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elif d=='^' or d == 'xor': c = int(a^b)
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elif d=='<=': c = int(a <= b)
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elif d=='<': c = int(a < b)
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elif d=='>': c = int(a > b)
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elif d=='>=': c = int(a >= b)
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elif d=='<<': c = a<<b
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elif d=='>>': c = a>>b
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else: c = 0
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return c
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def get_num(lst):
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"""
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Try to obtain a number from a list of tokens. The token types are defined in :py:attr:`waflib.Tools.ccroot.tok_types`.
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:param lst: list of preprocessor tokens
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:type lst: list of tuple (tokentype, value)
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:return: a pair containing the number and the rest of the list
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:rtype: tuple(value, list)
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"""
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if not lst: raise PreprocError("empty list for get_num")
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(p, v) = lst[0]
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if p == OP:
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if v == '(':
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count_par = 1
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i = 1
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while i < len(lst):
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(p, v) = lst[i]
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if p == OP:
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if v == ')':
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count_par -= 1
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if count_par == 0:
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break
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elif v == '(':
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count_par += 1
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i += 1
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else:
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raise PreprocError("rparen expected %r" % lst)
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(num, _) = get_term(lst[1:i])
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return (num, lst[i+1:])
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elif v == '+':
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return get_num(lst[1:])
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elif v == '-':
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num, lst = get_num(lst[1:])
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return (reduce_nums('-1', num, '*'), lst)
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elif v == '!':
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num, lst = get_num(lst[1:])
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return (int(not int(num)), lst)
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elif v == '~':
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num, lst = get_num(lst[1:])
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return (~ int(num), lst)
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else:
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raise PreprocError("Invalid op token %r for get_num" % lst)
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elif p == NUM:
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return v, lst[1:]
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elif p == IDENT:
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# all macros should have been replaced, remaining identifiers eval to 0
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return 0, lst[1:]
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else:
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raise PreprocError("Invalid token %r for get_num" % lst)
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def get_term(lst):
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"""
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Evaluate an expression recursively, for example::
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1+1+1 -> 2+1 -> 3
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:param lst: list of tokens
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:type lst: list of tuple(token, value)
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:return: the value and the remaining tokens
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:rtype: value, list
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"""
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if not lst: raise PreprocError("empty list for get_term")
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num, lst = get_num(lst)
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if not lst:
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return (num, [])
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(p, v) = lst[0]
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if p == OP:
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if v == ',':
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# skip
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return get_term(lst[1:])
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elif v == '?':
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count_par = 0
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i = 1
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while i < len(lst):
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(p, v) = lst[i]
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if p == OP:
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if v == ')':
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count_par -= 1
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elif v == '(':
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count_par += 1
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elif v == ':':
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if count_par == 0:
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break
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i += 1
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else:
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raise PreprocError("rparen expected %r" % lst)
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if int(num):
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return get_term(lst[1:i])
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else:
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return get_term(lst[i+1:])
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else:
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num2, lst = get_num(lst[1:])
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if not lst:
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# no more tokens to process
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num2 = reduce_nums(num, num2, v)
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return get_term([(NUM, num2)] + lst)
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# operator precedence
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p2, v2 = lst[0]
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if p2 != OP:
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raise PreprocError("op expected %r" % lst)
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if prec[v2] >= prec[v]:
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num2 = reduce_nums(num, num2, v)
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return get_term([(NUM, num2)] + lst)
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else:
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num3, lst = get_num(lst[1:])
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num3 = reduce_nums(num2, num3, v2)
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return get_term([(NUM, num), (p, v), (NUM, num3)] + lst)
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raise PreprocError("cannot reduce %r" % lst)
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def reduce_eval(lst):
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"""
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Take a list of tokens and output true or false for #if/#elif conditions.
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:param lst: a list of tokens
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:type lst: list of tuple(token, value)
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:return: a token
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:rtype: tuple(NUM, int)
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"""
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num, lst = get_term(lst)
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return (NUM, num)
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def stringize(lst):
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"""
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Merge a list of tokens into a string
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:param lst: a list of tokens
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:type lst: list of tuple(token, value)
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:rtype: string
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"""
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lst = [str(v2) for (p2, v2) in lst]
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return "".join(lst)
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def paste_tokens(t1, t2):
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"""
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Token pasting works between identifiers, particular operators, and identifiers and numbers::
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a ## b -> ab
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> ## = -> >=
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a ## 2 -> a2
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:param t1: token
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:type t1: tuple(type, value)
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:param t2: token
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:type t2: tuple(type, value)
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"""
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p1 = None
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if t1[0] == OP and t2[0] == OP:
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p1 = OP
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elif t1[0] == IDENT and (t2[0] == IDENT or t2[0] == NUM):
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p1 = IDENT
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elif t1[0] == NUM and t2[0] == NUM:
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p1 = NUM
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if not p1:
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raise PreprocError('tokens do not make a valid paste %r and %r' % (t1, t2))
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return (p1, t1[1] + t2[1])
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def reduce_tokens(lst, defs, ban=[]):
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"""
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Replace the tokens in lst, using the macros provided in defs, and a list of macros that cannot be re-applied
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:param lst: list of tokens
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:type lst: list of tuple(token, value)
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:param defs: macro definitions
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:type defs: dict
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:param ban: macros that cannot be substituted (recursion is not allowed)
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:type ban: list of string
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:return: the new list of tokens
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:rtype: value, list
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"""
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i = 0
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while i < len(lst):
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(p, v) = lst[i]
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if p == IDENT and v == "defined":
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del lst[i]
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if i < len(lst):
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(p2, v2) = lst[i]
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if p2 == IDENT:
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if v2 in defs:
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lst[i] = (NUM, 1)
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else:
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lst[i] = (NUM, 0)
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elif p2 == OP and v2 == '(':
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del lst[i]
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(p2, v2) = lst[i]
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del lst[i] # remove the ident, and change the ) for the value
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if v2 in defs:
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lst[i] = (NUM, 1)
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else:
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lst[i] = (NUM, 0)
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else:
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raise PreprocError("Invalid define expression %r" % lst)
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elif p == IDENT and v in defs:
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if isinstance(defs[v], str):
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a, b = extract_macro(defs[v])
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defs[v] = b
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macro_def = defs[v]
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to_add = macro_def[1]
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if isinstance(macro_def[0], list):
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# macro without arguments
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del lst[i]
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accu = to_add[:]
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reduce_tokens(accu, defs, ban+[v])
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for tmp in accu:
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lst.insert(i, tmp)
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i += 1
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else:
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# collect the arguments for the funcall
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args = []
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del lst[i]
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if i >= len(lst):
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raise PreprocError("expected '(' after %r (got nothing)" % v)
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(p2, v2) = lst[i]
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if p2 != OP or v2 != '(':
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raise PreprocError("expected '(' after %r" % v)
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del lst[i]
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one_param = []
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count_paren = 0
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while i < len(lst):
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p2, v2 = lst[i]
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del lst[i]
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if p2 == OP and count_paren == 0:
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if v2 == '(':
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one_param.append((p2, v2))
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count_paren += 1
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elif v2 == ')':
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if one_param: args.append(one_param)
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break
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elif v2 == ',':
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if not one_param: raise PreprocError("empty param in funcall %s" % v)
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args.append(one_param)
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one_param = []
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else:
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one_param.append((p2, v2))
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else:
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one_param.append((p2, v2))
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if v2 == '(': count_paren += 1
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elif v2 == ')': count_paren -= 1
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else:
|
|
raise PreprocError('malformed macro')
|
|
|
|
# substitute the arguments within the define expression
|
|
accu = []
|
|
arg_table = macro_def[0]
|
|
j = 0
|
|
while j < len(to_add):
|
|
(p2, v2) = to_add[j]
|
|
|
|
if p2 == OP and v2 == '#':
|
|
# stringize is for arguments only
|
|
if j+1 < len(to_add) and to_add[j+1][0] == IDENT and to_add[j+1][1] in arg_table:
|
|
toks = args[arg_table[to_add[j+1][1]]]
|
|
accu.append((STR, stringize(toks)))
|
|
j += 1
|
|
else:
|
|
accu.append((p2, v2))
|
|
elif p2 == OP and v2 == '##':
|
|
# token pasting, how can man invent such a complicated system?
|
|
if accu and j+1 < len(to_add):
|
|
# we have at least two tokens
|
|
|
|
t1 = accu[-1]
|
|
|
|
if to_add[j+1][0] == IDENT and to_add[j+1][1] in arg_table:
|
|
toks = args[arg_table[to_add[j+1][1]]]
|
|
|
|
if toks:
|
|
accu[-1] = paste_tokens(t1, toks[0]) #(IDENT, accu[-1][1] + toks[0][1])
|
|
accu.extend(toks[1:])
|
|
else:
|
|
# error, case "a##"
|
|
accu.append((p2, v2))
|
|
accu.extend(toks)
|
|
elif to_add[j+1][0] == IDENT and to_add[j+1][1] == '__VA_ARGS__':
|
|
# TODO not sure
|
|
# first collect the tokens
|
|
va_toks = []
|
|
st = len(macro_def[0])
|
|
pt = len(args)
|
|
for x in args[pt-st+1:]:
|
|
va_toks.extend(x)
|
|
va_toks.append((OP, ','))
|
|
if va_toks: va_toks.pop() # extra comma
|
|
if len(accu)>1:
|
|
(p3, v3) = accu[-1]
|
|
(p4, v4) = accu[-2]
|
|
if v3 == '##':
|
|
# remove the token paste
|
|
accu.pop()
|
|
if v4 == ',' and pt < st:
|
|
# remove the comma
|
|
accu.pop()
|
|
accu += va_toks
|
|
else:
|
|
accu[-1] = paste_tokens(t1, to_add[j+1])
|
|
|
|
j += 1
|
|
else:
|
|
# Invalid paste, case "##a" or "b##"
|
|
accu.append((p2, v2))
|
|
|
|
elif p2 == IDENT and v2 in arg_table:
|
|
toks = args[arg_table[v2]]
|
|
reduce_tokens(toks, defs, ban+[v])
|
|
accu.extend(toks)
|
|
else:
|
|
accu.append((p2, v2))
|
|
|
|
j += 1
|
|
|
|
|
|
reduce_tokens(accu, defs, ban+[v])
|
|
|
|
for x in range(len(accu)-1, -1, -1):
|
|
lst.insert(i, accu[x])
|
|
|
|
i += 1
|
|
|
|
|
|
def eval_macro(lst, defs):
|
|
"""
|
|
Reduce the tokens by :py:func:`waflib.Tools.c_preproc.reduce_tokens` and try to return a 0/1 result by :py:func:`waflib.Tools.c_preproc.reduce_eval`.
|
|
|
|
:param lst: list of tokens
|
|
:type lst: list of tuple(token, value)
|
|
:param defs: macro definitions
|
|
:type defs: dict
|
|
:rtype: int
|
|
"""
|
|
reduce_tokens(lst, defs, [])
|
|
if not lst: raise PreprocError("missing tokens to evaluate")
|
|
(p, v) = reduce_eval(lst)
|
|
return int(v) != 0
|
|
|
|
def extract_macro(txt):
|
|
"""
|
|
Process a macro definition of the form::
|
|
#define f(x, y) x * y
|
|
|
|
into a function or a simple macro without arguments
|
|
|
|
:param txt: expression to exact a macro definition from
|
|
:type txt: string
|
|
:return: a tuple containing the name, the list of arguments and the replacement
|
|
:rtype: tuple(string, [list, list])
|
|
"""
|
|
t = tokenize(txt)
|
|
if re_fun.search(txt):
|
|
p, name = t[0]
|
|
|
|
p, v = t[1]
|
|
if p != OP: raise PreprocError("expected open parenthesis")
|
|
|
|
i = 1
|
|
pindex = 0
|
|
params = {}
|
|
prev = '('
|
|
|
|
while 1:
|
|
i += 1
|
|
p, v = t[i]
|
|
|
|
if prev == '(':
|
|
if p == IDENT:
|
|
params[v] = pindex
|
|
pindex += 1
|
|
prev = p
|
|
elif p == OP and v == ')':
|
|
break
|
|
else:
|
|
raise PreprocError("unexpected token (3)")
|
|
elif prev == IDENT:
|
|
if p == OP and v == ',':
|
|
prev = v
|
|
elif p == OP and v == ')':
|
|
break
|
|
else:
|
|
raise PreprocError("comma or ... expected")
|
|
elif prev == ',':
|
|
if p == IDENT:
|
|
params[v] = pindex
|
|
pindex += 1
|
|
prev = p
|
|
elif p == OP and v == '...':
|
|
raise PreprocError("not implemented (1)")
|
|
else:
|
|
raise PreprocError("comma or ... expected (2)")
|
|
elif prev == '...':
|
|
raise PreprocError("not implemented (2)")
|
|
else:
|
|
raise PreprocError("unexpected else")
|
|
|
|
#~ print (name, [params, t[i+1:]])
|
|
return (name, [params, t[i+1:]])
|
|
else:
|
|
(p, v) = t[0]
|
|
if len(t) > 1:
|
|
return (v, [[], t[1:]])
|
|
else:
|
|
# empty define, assign an empty token
|
|
return (v, [[], [('T','')]])
|
|
|
|
re_include = re.compile('^\s*(<(?P<a>.*)>|"(?P<b>.*)")')
|
|
def extract_include(txt, defs):
|
|
"""
|
|
Process a line in the form::
|
|
|
|
#include foo
|
|
|
|
:param txt: include line to process
|
|
:type txt: string
|
|
:param defs: macro definitions
|
|
:type defs: dict
|
|
:return: the file name
|
|
:rtype: string
|
|
"""
|
|
m = re_include.search(txt)
|
|
if m:
|
|
if m.group('a'): return '<', m.group('a')
|
|
if m.group('b'): return '"', m.group('b')
|
|
|
|
# perform preprocessing and look at the result, it must match an include
|
|
toks = tokenize(txt)
|
|
reduce_tokens(toks, defs, ['waf_include'])
|
|
|
|
if not toks:
|
|
raise PreprocError("could not parse include %s" % txt)
|
|
|
|
if len(toks) == 1:
|
|
if toks[0][0] == STR:
|
|
return '"', toks[0][1]
|
|
else:
|
|
if toks[0][1] == '<' and toks[-1][1] == '>':
|
|
ret = '<', stringize(toks).lstrip('<').rstrip('>')
|
|
return ret
|
|
|
|
raise PreprocError("could not parse include %s." % txt)
|
|
|
|
def parse_char(txt):
|
|
"""
|
|
Parse a c character
|
|
|
|
:param txt: character to parse
|
|
:type txt: string
|
|
:return: a character literal
|
|
:rtype: string
|
|
"""
|
|
|
|
if not txt: raise PreprocError("attempted to parse a null char")
|
|
if txt[0] != '\\':
|
|
return ord(txt)
|
|
c = txt[1]
|
|
if c == 'x':
|
|
if len(txt) == 4 and txt[3] in string.hexdigits: return int(txt[2:], 16)
|
|
return int(txt[2:], 16)
|
|
elif c.isdigit():
|
|
if c == '0' and len(txt)==2: return 0
|
|
for i in 3, 2, 1:
|
|
if len(txt) > i and txt[1:1+i].isdigit():
|
|
return (1+i, int(txt[1:1+i], 8))
|
|
else:
|
|
try: return chr_esc[c]
|
|
except KeyError: raise PreprocError("could not parse char literal '%s'" % txt)
|
|
|
|
def tokenize(s):
|
|
"""
|
|
Convert a string into a list of tokens (shlex.split does not apply to c/c++/d)
|
|
|
|
:param s: input to tokenize
|
|
:type s: string
|
|
:return: a list of tokens
|
|
:rtype: list of tuple(token, value)
|
|
"""
|
|
return tokenize_private(s)[:] # force a copy of the results
|
|
|
|
@Utils.run_once
|
|
def tokenize_private(s):
|
|
ret = []
|
|
for match in re_clexer.finditer(s):
|
|
m = match.group
|
|
for name in tok_types:
|
|
v = m(name)
|
|
if v:
|
|
if name == IDENT:
|
|
try:
|
|
g_optrans[v];
|
|
name = OP
|
|
except KeyError:
|
|
# c++ specific
|
|
if v.lower() == "true":
|
|
v = 1
|
|
name = NUM
|
|
elif v.lower() == "false":
|
|
v = 0
|
|
name = NUM
|
|
elif name == NUM:
|
|
if m('oct'): v = int(v, 8)
|
|
elif m('hex'): v = int(m('hex'), 16)
|
|
elif m('n0'): v = m('n0')
|
|
else:
|
|
v = m('char')
|
|
if v: v = parse_char(v)
|
|
else: v = m('n2') or m('n4')
|
|
elif name == OP:
|
|
if v == '%:': v = '#'
|
|
elif v == '%:%:': v = '##'
|
|
elif name == STR:
|
|
# remove the quotes around the string
|
|
v = v[1:-1]
|
|
ret.append((name, v))
|
|
break
|
|
return ret
|
|
|
|
@lru_cache(maxsize=1000)
|
|
def parse_lines(filepath):
|
|
lines = filter_comments(filepath)
|
|
lines.append((POPFILE, ''))
|
|
lines.reverse()
|
|
return lines
|
|
|
|
@Utils.run_once
|
|
def define_name(line):
|
|
"""
|
|
:param line: define line
|
|
:type line: string
|
|
:rtype: string
|
|
:return: the define name
|
|
"""
|
|
return re_mac.match(line).group(0)
|
|
|
|
class c_parser(object):
|
|
"""
|
|
Used by :py:func:`waflib.Tools.c_preproc.scan` to parse c/h files. Note that by default,
|
|
only project headers are parsed.
|
|
"""
|
|
def __init__(self, nodepaths=None, defines=None):
|
|
self.lines = []
|
|
"""list of lines read"""
|
|
|
|
if defines is None:
|
|
self.defs = {}
|
|
else:
|
|
self.defs = dict(defines) # make a copy
|
|
self.state = []
|
|
|
|
self.count_files = 0
|
|
self.currentnode_stack = []
|
|
|
|
self.nodepaths = nodepaths or []
|
|
"""Include paths"""
|
|
|
|
self.nodes = []
|
|
"""List of :py:class:`waflib.Node.Node` found so far"""
|
|
|
|
self.names = []
|
|
"""List of file names that could not be matched by any file"""
|
|
|
|
self.curfile = ''
|
|
"""Current file"""
|
|
|
|
self.ban_includes = set([])
|
|
"""Includes that must not be read (#pragma once)"""
|
|
|
|
def cached_find_resource(self, node, filename):
|
|
"""
|
|
Find a file from the input directory
|
|
|
|
:param node: directory
|
|
:type node: :py:class:`waflib.Node.Node`
|
|
:param filename: header to find
|
|
:type filename: string
|
|
:return: the node if found, or None
|
|
:rtype: :py:class:`waflib.Node.Node`
|
|
"""
|
|
try:
|
|
nd = node.ctx.cache_nd
|
|
except AttributeError:
|
|
nd = node.ctx.cache_nd = {}
|
|
|
|
tup = (node, filename)
|
|
try:
|
|
return nd[tup]
|
|
except KeyError:
|
|
ret = node.find_resource(filename)
|
|
if ret:
|
|
if getattr(ret, 'children', None):
|
|
ret = None
|
|
elif ret.is_child_of(node.ctx.bldnode):
|
|
tmp = node.ctx.srcnode.search_node(ret.path_from(node.ctx.bldnode))
|
|
if tmp and getattr(tmp, 'children', None):
|
|
ret = None
|
|
nd[tup] = ret
|
|
return ret
|
|
|
|
def tryfind(self, filename):
|
|
"""
|
|
Try to obtain a node from the filename based from the include paths. Will add
|
|
the node found to :py:attr:`waflib.Tools.c_preproc.c_parser.nodes` or the file name to
|
|
:py:attr:`waflib.Tools.c_preproc.c_parser.names` if no corresponding file is found. Called by
|
|
:py:attr:`waflib.Tools.c_preproc.c_parser.start`.
|
|
|
|
:param filename: header to find
|
|
:type filename: string
|
|
:return: the node if found
|
|
:rtype: :py:class:`waflib.Node.Node`
|
|
"""
|
|
if filename.endswith('.moc'):
|
|
# we could let the qt4 module use a subclass, but then the function "scan" below must be duplicated
|
|
# in the qt4 and in the qt5 classes. So we have two lines here and it is sufficient. TODO waf 1.9
|
|
self.names.append(filename)
|
|
return None
|
|
|
|
self.curfile = filename
|
|
|
|
# for msvc it should be a for loop over the whole stack
|
|
found = self.cached_find_resource(self.currentnode_stack[-1], filename)
|
|
|
|
for n in self.nodepaths:
|
|
if found:
|
|
break
|
|
found = self.cached_find_resource(n, filename)
|
|
|
|
if found and not found in self.ban_includes:
|
|
# TODO duplicates do not increase the no-op build times too much, but they may be worth removing
|
|
self.nodes.append(found)
|
|
self.addlines(found)
|
|
else:
|
|
if not filename in self.names:
|
|
self.names.append(filename)
|
|
return found
|
|
|
|
def addlines(self, node):
|
|
"""
|
|
Add the lines from a header in the list of preprocessor lines to parse
|
|
|
|
:param node: header
|
|
:type node: :py:class:`waflib.Node.Node`
|
|
"""
|
|
|
|
self.currentnode_stack.append(node.parent)
|
|
|
|
self.count_files += 1
|
|
if self.count_files > recursion_limit:
|
|
# issue #812
|
|
raise PreprocError("recursion limit exceeded")
|
|
|
|
filepath = node.abspath()
|
|
debug('preproc: reading file %r', filepath)
|
|
try:
|
|
lines = parse_lines(filepath)
|
|
except EnvironmentError:
|
|
raise PreprocError("could not read the file %s" % filepath)
|
|
except Exception:
|
|
if Logs.verbose > 0:
|
|
error("parsing %s failed" % filepath)
|
|
traceback.print_exc()
|
|
else:
|
|
self.lines.extend(lines)
|
|
|
|
def start(self, node, env):
|
|
"""
|
|
Preprocess a source file to obtain the dependencies, which are accumulated to :py:attr:`waflib.Tools.c_preproc.c_parser.nodes`
|
|
and :py:attr:`waflib.Tools.c_preproc.c_parser.names`.
|
|
|
|
:param node: source file
|
|
:type node: :py:class:`waflib.Node.Node`
|
|
:param env: config set containing additional defines to take into account
|
|
:type env: :py:class:`waflib.ConfigSet.ConfigSet`
|
|
"""
|
|
|
|
debug('preproc: scanning %s (in %s)', node.name, node.parent.name)
|
|
|
|
bld = node.ctx
|
|
try:
|
|
self.parse_cache = bld.parse_cache
|
|
except AttributeError:
|
|
self.parse_cache = bld.parse_cache = {}
|
|
else:
|
|
# TODO a LRU cache would be appropriate here
|
|
if len(self.parse_cache) > 500:
|
|
self.parse_cache.clear()
|
|
|
|
self.current_file = node
|
|
self.addlines(node)
|
|
|
|
# macros may be defined on the command-line, so they must be parsed as if they were part of the file
|
|
if env['DEFINES']:
|
|
try:
|
|
lst = ['%s %s' % (x[0], trimquotes('='.join(x[1:]))) for x in [y.split('=') for y in env['DEFINES']]]
|
|
lst.reverse()
|
|
self.lines.extend([('define', x) for x in lst])
|
|
except AttributeError:
|
|
# if the defines are invalid the compiler will tell the user
|
|
pass
|
|
|
|
while self.lines:
|
|
(token, line) = self.lines.pop()
|
|
if token == POPFILE:
|
|
self.count_files -= 1
|
|
self.currentnode_stack.pop()
|
|
continue
|
|
|
|
try:
|
|
ve = Logs.verbose
|
|
if ve: debug('preproc: line is %s - %s state is %s', token, line, self.state)
|
|
state = self.state
|
|
|
|
# make certain we define the state if we are about to enter in an if block
|
|
if token[:2] == 'if':
|
|
state.append(undefined)
|
|
elif token == 'endif':
|
|
state.pop()
|
|
|
|
# skip lines when in a dead 'if' branch, wait for the endif
|
|
if token[0] != 'e':
|
|
if skipped in self.state or ignored in self.state:
|
|
continue
|
|
|
|
if token == 'if':
|
|
ret = eval_macro(tokenize(line), self.defs)
|
|
if ret: state[-1] = accepted
|
|
else: state[-1] = ignored
|
|
elif token == 'ifdef':
|
|
m = re_mac.match(line)
|
|
if m and m.group(0) in self.defs: state[-1] = accepted
|
|
else: state[-1] = ignored
|
|
elif token == 'ifndef':
|
|
m = re_mac.match(line)
|
|
if m and m.group(0) in self.defs: state[-1] = ignored
|
|
else: state[-1] = accepted
|
|
elif token == 'include' or token == 'import':
|
|
(kind, inc) = extract_include(line, self.defs)
|
|
if ve: debug('preproc: include found %s (%s) ', inc, kind)
|
|
if kind == '"' or not strict_quotes:
|
|
self.current_file = self.tryfind(inc)
|
|
if token == 'import':
|
|
self.ban_includes.add(self.current_file)
|
|
elif token == 'elif':
|
|
if state[-1] == accepted:
|
|
state[-1] = skipped
|
|
elif state[-1] == ignored:
|
|
if eval_macro(tokenize(line), self.defs):
|
|
state[-1] = accepted
|
|
elif token == 'else':
|
|
if state[-1] == accepted: state[-1] = skipped
|
|
elif state[-1] == ignored: state[-1] = accepted
|
|
elif token == 'define':
|
|
try:
|
|
self.defs[define_name(line)] = line
|
|
except Exception:
|
|
raise PreprocError("Invalid define line %s" % line)
|
|
elif token == 'undef':
|
|
m = re_mac.match(line)
|
|
if m and m.group(0) in self.defs:
|
|
self.defs.__delitem__(m.group(0))
|
|
#print "undef %s" % name
|
|
elif token == 'pragma':
|
|
if re_pragma_once.match(line.lower()):
|
|
self.ban_includes.add(self.current_file)
|
|
except Exception as e:
|
|
if Logs.verbose:
|
|
debug('preproc: line parsing failed (%s): %s %s', e, line, Utils.ex_stack())
|
|
|
|
def scan(task):
|
|
"""
|
|
Get the dependencies using a c/c++ preprocessor, this is required for finding dependencies of the kind::
|
|
|
|
#include some_macro()
|
|
|
|
This function is bound as a task method on :py:class:`waflib.Tools.c.c` and :py:class:`waflib.Tools.cxx.cxx` for example
|
|
"""
|
|
|
|
global go_absolute
|
|
|
|
try:
|
|
incn = task.generator.includes_nodes
|
|
except AttributeError:
|
|
raise Errors.WafError('%r is missing a feature such as "c", "cxx" or "includes": ' % task.generator)
|
|
|
|
if go_absolute:
|
|
nodepaths = incn + [task.generator.bld.root.find_dir(x) for x in standard_includes]
|
|
else:
|
|
nodepaths = [x for x in incn if x.is_child_of(x.ctx.srcnode) or x.is_child_of(x.ctx.bldnode)]
|
|
|
|
tmp = c_parser(nodepaths)
|
|
tmp.start(task.inputs[0], task.env)
|
|
if Logs.verbose:
|
|
debug('deps: deps for %r: %r; unresolved %r' % (task.inputs, tmp.nodes, tmp.names))
|
|
return (tmp.nodes, tmp.names)
|
|
|