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+#!/usr/bin/env python
+# encoding: utf-8
+# Thomas Nagy, 2006-2018 (ita)
+
+"""
+C/C++ preprocessor for finding dependencies
+
+Reasons for using the Waf preprocessor by default
+
+#. Some c/c++ extensions (Qt) require a custom preprocessor for obtaining the dependencies (.moc files)
+#. Not all compilers provide .d files for obtaining the dependencies (portability)
+#. A naive file scanner will not catch the constructs such as "#include foo()"
+#. A naive file scanner will catch unnecessary dependencies (change an unused header -> recompile everything)
+
+Regarding the speed concerns:
+
+* the preprocessing is performed only when files must be compiled
+* the macros are evaluated only for #if/#elif/#include
+* system headers are not scanned by default
+
+Now if you do not want the Waf preprocessor, the tool +gccdeps* uses the .d files produced
+during the compilation to track the dependencies (useful when used with the boost libraries).
+It only works with gcc >= 4.4 though.
+
+A dumb preprocessor is also available in the tool *c_dumbpreproc*
+"""
+# TODO: more varargs, pragma once
+
+import re, string, traceback
+from waflib import Logs, Utils, Errors
+
+class PreprocError(Errors.WafError):
+ pass
+
+FILE_CACHE_SIZE = 100000
+LINE_CACHE_SIZE = 100000
+
+POPFILE = '-'
+"Constant representing a special token used in :py:meth:`waflib.Tools.c_preproc.c_parser.start` iteration to switch to a header read previously"
+
+recursion_limit = 150
+"Limit on the amount of files to read in the dependency scanner"
+
+go_absolute = False
+"Set to True to track headers on files in /usr/include, else absolute paths are ignored (but it becomes very slow)"
+
+standard_includes = ['/usr/local/include', '/usr/include']
+if Utils.is_win32:
+ standard_includes = []
+
+use_trigraphs = 0
+"""Apply trigraph rules (False by default)"""
+
+# obsolete, do not use
+strict_quotes = 0
+
+g_optrans = {
+'not':'!',
+'not_eq':'!',
+'and':'&&',
+'and_eq':'&=',
+'or':'||',
+'or_eq':'|=',
+'xor':'^',
+'xor_eq':'^=',
+'bitand':'&',
+'bitor':'|',
+'compl':'~',
+}
+"""Operators such as and/or/xor for c++. Set an empty dict to disable."""
+
+# ignore #warning and #error
+re_lines = re.compile(
+ '^[ \t]*(?:#|%:)[ \t]*(ifdef|ifndef|if|else|elif|endif|include|import|define|undef|pragma)[ \t]*(.*)\r*$',
+ re.IGNORECASE | re.MULTILINE)
+"""Match #include lines"""
+
+re_mac = re.compile(r"^[a-zA-Z_]\w*")
+"""Match macro definitions"""
+
+re_fun = re.compile('^[a-zA-Z_][a-zA-Z0-9_]*[(]')
+"""Match macro functions"""
+
+re_pragma_once = re.compile(r'^\s*once\s*', re.IGNORECASE)
+"""Match #pragma once statements"""
+
+re_nl = re.compile('\\\\\r*\n', re.MULTILINE)
+"""Match newlines"""
+
+re_cpp = re.compile(r'//.*?$|/\*.*?\*/|\'(?:\\.|[^\\\'])*\'|"(?:\\.|[^\\"])*"', re.DOTALL | re.MULTILINE )
+"""Filter C/C++ comments"""
+
+trig_def = [('??'+a, b) for a, b in zip("=-/!'()<>", r'#~\|^[]{}')]
+"""Trigraph definitions"""
+
+chr_esc = {'0':0, 'a':7, 'b':8, 't':9, 'n':10, 'f':11, 'v':12, 'r':13, '\\':92, "'":39}
+"""Escape characters"""
+
+NUM = 'i'
+"""Number token"""
+
+OP = 'O'
+"""Operator token"""
+
+IDENT = 'T'
+"""Identifier token"""
+
+STR = 's'
+"""String token"""
+
+CHAR = 'c'
+"""Character token"""
+
+tok_types = [NUM, STR, IDENT, OP]
+"""Token types"""
+
+exp_types = [
+ 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]*)""",
+ r'L?"([^"\\]|\\.)*"',
+ r'[a-zA-Z_]\w*',
+ r'%:%:|<<=|>>=|\.\.\.|<<|<%|<:|<=|>>|>=|\+\+|\+=|--|->|-=|\*=|/=|%:|%=|%>|==|&&|&=|\|\||\|=|\^=|:>|!=|##|[\(\)\{\}\[\]<>\?\|\^\*\+&=:!#;,%/\-\?\~\.]',
+]
+"""Expression types"""
+
+re_clexer = re.compile('|'.join(["(?P<%s>%s)" % (name, part) for name, part in zip(tok_types, exp_types)]), re.M)
+"""Match expressions into tokens"""
+
+accepted = 'a'
+"""Parser state is *accepted*"""
+
+ignored = 'i'
+"""Parser state is *ignored*, for example preprocessor lines in an #if 0 block"""
+
+undefined = 'u'
+"""Parser state is *undefined* at the moment"""
+
+skipped = 's'
+"""Parser state is *skipped*, for example preprocessor lines in a #elif 0 block"""
+
+def repl(m):
+ """Replace function used with :py:attr:`waflib.Tools.c_preproc.re_cpp`"""
+ s = m.group()
+ if s[0] == '/':
+ return ' '
+ return s
+
+prec = {}
+"""
+Operator precedence rules required for parsing expressions of the form::
+
+ #if 1 && 2 != 0
+"""
+ops = ['* / %', '+ -', '<< >>', '< <= >= >', '== !=', '& | ^', '&& ||', ',']
+for x, syms in enumerate(ops):
+ for u in syms.split():
+ prec[u] = x
+
+def reduce_nums(val_1, val_2, val_op):
+ """
+ Apply arithmetic rules to compute a result
+
+ :param val1: input parameter
+ :type val1: int or string
+ :param val2: input parameter
+ :type val2: int or string
+ :param val_op: C operator in *+*, */*, *-*, etc
+ :type val_op: string
+ :rtype: int
+ """
+ #print val_1, val_2, val_op
+
+ # now perform the operation, make certain a and b are numeric
+ try:
+ a = 0 + val_1
+ except TypeError:
+ a = int(val_1)
+ try:
+ b = 0 + val_2
+ except TypeError:
+ b = int(val_2)
+
+ d = val_op
+ if d == '%':
+ c = a % b
+ elif d=='+':
+ c = a + b
+ elif d=='-':
+ c = a - b
+ elif d=='*':
+ c = a * b
+ elif d=='/':
+ c = a / b
+ elif d=='^':
+ c = a ^ b
+ elif d=='==':
+ c = int(a == b)
+ elif d=='|' or d == 'bitor':
+ c = a | b
+ elif d=='||' or d == 'or' :
+ c = int(a or b)
+ elif d=='&' or d == 'bitand':
+ c = a & b
+ elif d=='&&' or d == 'and':
+ c = int(a and b)
+ elif d=='!=' or d == 'not_eq':
+ c = int(a != b)
+ elif d=='^' or d == 'xor':
+ c = int(a^b)
+ elif d=='<=':
+ c = int(a <= b)
+ elif d=='<':
+ c = int(a < b)
+ elif d=='>':
+ c = int(a > b)
+ elif d=='>=':
+ c = int(a >= b)
+ elif d=='<<':
+ c = a << b
+ elif d=='>>':
+ c = a >> b
+ else:
+ c = 0
+ return c
+
+def get_num(lst):
+ """
+ Try to obtain a number from a list of tokens. The token types are defined in :py:attr:`waflib.Tools.ccroot.tok_types`.
+
+ :param lst: list of preprocessor tokens
+ :type lst: list of tuple (tokentype, value)
+ :return: a pair containing the number and the rest of the list
+ :rtype: tuple(value, list)
+ """
+ if not lst:
+ raise PreprocError('empty list for get_num')
+ (p, v) = lst[0]
+ if p == OP:
+ if v == '(':
+ count_par = 1
+ i = 1
+ while i < len(lst):
+ (p, v) = lst[i]
+
+ if p == OP:
+ if v == ')':
+ count_par -= 1
+ if count_par == 0:
+ break
+ elif v == '(':
+ count_par += 1
+ i += 1
+ else:
+ raise PreprocError('rparen expected %r' % lst)
+
+ (num, _) = get_term(lst[1:i])
+ return (num, lst[i+1:])
+
+ elif v == '+':
+ return get_num(lst[1:])
+ elif v == '-':
+ num, lst = get_num(lst[1:])
+ return (reduce_nums('-1', num, '*'), lst)
+ elif v == '!':
+ num, lst = get_num(lst[1:])
+ return (int(not int(num)), lst)
+ elif v == '~':
+ num, lst = get_num(lst[1:])
+ return (~ int(num), lst)
+ else:
+ raise PreprocError('Invalid op token %r for get_num' % lst)
+ elif p == NUM:
+ return v, lst[1:]
+ elif p == IDENT:
+ # all macros should have been replaced, remaining identifiers eval to 0
+ return 0, lst[1:]
+ else:
+ raise PreprocError('Invalid token %r for get_num' % lst)
+
+def get_term(lst):
+ """
+ Evaluate an expression recursively, for example::
+
+ 1+1+1 -> 2+1 -> 3
+
+ :param lst: list of tokens
+ :type lst: list of tuple(token, value)
+ :return: the value and the remaining tokens
+ :rtype: value, list
+ """
+
+ if not lst:
+ raise PreprocError('empty list for get_term')
+ num, lst = get_num(lst)
+ if not lst:
+ return (num, [])
+ (p, v) = lst[0]
+ if p == OP:
+ if v == ',':
+ # skip
+ return get_term(lst[1:])
+ elif v == '?':
+ count_par = 0
+ i = 1
+ while i < len(lst):
+ (p, v) = lst[i]
+
+ if p == OP:
+ if v == ')':
+ count_par -= 1
+ elif v == '(':
+ count_par += 1
+ elif v == ':':
+ if count_par == 0:
+ break
+ i += 1
+ else:
+ raise PreprocError('rparen expected %r' % lst)
+
+ if int(num):
+ return get_term(lst[1:i])
+ else:
+ return get_term(lst[i+1:])
+
+ else:
+ num2, lst = get_num(lst[1:])
+
+ if not lst:
+ # no more tokens to process
+ num2 = reduce_nums(num, num2, v)
+ return get_term([(NUM, num2)] + lst)
+
+ # operator precedence
+ p2, v2 = lst[0]
+ if p2 != OP:
+ raise PreprocError('op expected %r' % lst)
+
+ if prec[v2] >= prec[v]:
+ num2 = reduce_nums(num, num2, v)
+ return get_term([(NUM, num2)] + lst)
+ else:
+ num3, lst = get_num(lst[1:])
+ num3 = reduce_nums(num2, num3, v2)
+ return get_term([(NUM, num), (p, v), (NUM, num3)] + lst)
+
+
+ raise PreprocError('cannot reduce %r' % lst)
+
+def reduce_eval(lst):
+ """
+ Take a list of tokens and output true or false for #if/#elif conditions.
+
+ :param lst: a list of tokens
+ :type lst: list of tuple(token, value)
+ :return: a token
+ :rtype: tuple(NUM, int)
+ """
+ num, lst = get_term(lst)
+ return (NUM, num)
+
+def stringize(lst):
+ """
+ Merge a list of tokens into a string
+
+ :param lst: a list of tokens
+ :type lst: list of tuple(token, value)
+ :rtype: string
+ """
+ lst = [str(v2) for (p2, v2) in lst]
+ return "".join(lst)
+
+def paste_tokens(t1, t2):
+ """
+ Token pasting works between identifiers, particular operators, and identifiers and numbers::
+
+ a ## b -> ab
+ > ## = -> >=
+ a ## 2 -> a2
+
+ :param t1: token
+ :type t1: tuple(type, value)
+ :param t2: token
+ :type t2: tuple(type, value)
+ """
+ p1 = None
+ if t1[0] == OP and t2[0] == OP:
+ p1 = OP
+ elif t1[0] == IDENT and (t2[0] == IDENT or t2[0] == NUM):
+ p1 = IDENT
+ elif t1[0] == NUM and t2[0] == NUM:
+ p1 = NUM
+ if not p1:
+ raise PreprocError('tokens do not make a valid paste %r and %r' % (t1, t2))
+ return (p1, t1[1] + t2[1])
+
+def reduce_tokens(lst, defs, ban=[]):
+ """
+ Replace the tokens in lst, using the macros provided in defs, and a list of macros that cannot be re-applied
+
+ :param lst: list of tokens
+ :type lst: list of tuple(token, value)
+ :param defs: macro definitions
+ :type defs: dict
+ :param ban: macros that cannot be substituted (recursion is not allowed)
+ :type ban: list of string
+ :return: the new list of tokens
+ :rtype: value, list
+ """
+
+ i = 0
+ while i < len(lst):
+ (p, v) = lst[i]
+
+ if p == IDENT and v == "defined":
+ del lst[i]
+ if i < len(lst):
+ (p2, v2) = lst[i]
+ if p2 == IDENT:
+ if v2 in defs:
+ lst[i] = (NUM, 1)
+ else:
+ lst[i] = (NUM, 0)
+ elif p2 == OP and v2 == '(':
+ del lst[i]
+ (p2, v2) = lst[i]
+ del lst[i] # remove the ident, and change the ) for the value
+ if v2 in defs:
+ lst[i] = (NUM, 1)
+ else:
+ lst[i] = (NUM, 0)
+ else:
+ raise PreprocError('Invalid define expression %r' % lst)
+
+ elif p == IDENT and v in defs:
+
+ if isinstance(defs[v], str):
+ a, b = extract_macro(defs[v])
+ defs[v] = b
+ macro_def = defs[v]
+ to_add = macro_def[1]
+
+ if isinstance(macro_def[0], list):
+ # macro without arguments
+ del lst[i]
+ accu = to_add[:]
+ reduce_tokens(accu, defs, ban+[v])
+ for tmp in accu:
+ lst.insert(i, tmp)
+ i += 1
+ else:
+ # collect the arguments for the funcall
+
+ args = []
+ del lst[i]
+
+ if i >= len(lst):
+ raise PreprocError('expected ( after %r (got nothing)' % v)
+
+ (p2, v2) = lst[i]
+ if p2 != OP or v2 != '(':
+ raise PreprocError('expected ( after %r' % v)
+
+ del lst[i]
+
+ one_param = []
+ count_paren = 0
+ while i < len(lst):
+ p2, v2 = lst[i]
+
+ del lst[i]
+ if p2 == OP and count_paren == 0:
+ if v2 == '(':
+ one_param.append((p2, v2))
+ count_paren += 1
+ elif v2 == ')':
+ if one_param:
+ args.append(one_param)
+ break
+ elif v2 == ',':
+ if not one_param:
+ raise PreprocError('empty param in funcall %r' % v)
+ args.append(one_param)
+ one_param = []
+ else:
+ one_param.append((p2, v2))
+ else:
+ one_param.append((p2, v2))
+ if v2 == '(':
+ count_paren += 1
+ elif v2 == ')':
+ count_paren -= 1
+ 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__':
+ # 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')
+
+ if lst:
+ p, v = lst[0]
+ if p == IDENT and v not in defs:
+ raise PreprocError('missing macro %r' % lst)
+
+ 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 (')
+
+ 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(r'^\s*(<(?:.*)>|"(?:.*)")')
+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:
+ txt = m.group(1)
+ return txt[0], txt[1:-1]
+
+ # 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 %r' % 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 %r' % 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 %r' % 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
+
+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:
+ if v in g_optrans:
+ name = OP
+ elif 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
+
+def format_defines(lst):
+ ret = []
+ for y in lst:
+ if y:
+ pos = y.find('=')
+ if pos == -1:
+ # "-DFOO" should give "#define FOO 1"
+ ret.append(y)
+ elif pos > 0:
+ # all others are assumed to be -DX=Y
+ ret.append('%s %s' % (y[:pos], y[pos+1:]))
+ else:
+ raise ValueError('Invalid define expression %r' % y)
+ return ret
+
+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)"""
+
+ self.listed = set()
+ """Include nodes/names already listed to avoid duplicates in self.nodes/self.names"""
+
+ 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:
+ cache = node.ctx.preproc_cache_node
+ except AttributeError:
+ cache = node.ctx.preproc_cache_node = Utils.lru_cache(FILE_CACHE_SIZE)
+
+ key = (node, filename)
+ try:
+ return cache[key]
+ 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
+ cache[key] = ret
+ return ret
+
+ def tryfind(self, filename, kind='"', env=None):
+ """
+ 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.
+ self.names.append(filename)
+ return None
+
+ self.curfile = filename
+
+ found = None
+ if kind == '"':
+ if env.MSVC_VERSION:
+ for n in reversed(self.currentnode_stack):
+ found = self.cached_find_resource(n, filename)
+ if found:
+ break
+ else:
+ found = self.cached_find_resource(self.currentnode_stack[-1], filename)
+
+ if not found:
+ for n in self.nodepaths:
+ found = self.cached_find_resource(n, filename)
+ if found:
+ break
+
+ listed = self.listed
+ if found and not found in self.ban_includes:
+ if found not in listed:
+ listed.add(found)
+ self.nodes.append(found)
+ self.addlines(found)
+ else:
+ if filename not in listed:
+ listed.add(filename)
+ self.names.append(filename)
+ return found
+
+ def filter_comments(self, node):
+ """
+ Filter the comments from a c/h file, and return the preprocessor lines.
+ 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.
+
+ :return: the preprocessor directives as a list of (keyword, line)
+ :rtype: a list of string pairs
+ """
+ # return a list of tuples : keyword, line
+ code = node.read()
+ if use_trigraphs:
+ for (a, b) in trig_def:
+ code = code.split(a).join(b)
+ code = re_nl.sub('', code)
+ code = re_cpp.sub(repl, code)
+ return re_lines.findall(code)
+
+ def parse_lines(self, node):
+ try:
+ cache = node.ctx.preproc_cache_lines
+ except AttributeError:
+ cache = node.ctx.preproc_cache_lines = Utils.lru_cache(LINE_CACHE_SIZE)
+ try:
+ return cache[node]
+ except KeyError:
+ cache[node] = lines = self.filter_comments(node)
+ lines.append((POPFILE, ''))
+ lines.reverse()
+ return lines
+
+ 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')
+
+ if Logs.verbose:
+ Logs.debug('preproc: reading file %r', node)
+ try:
+ lines = self.parse_lines(node)
+ except EnvironmentError:
+ raise PreprocError('could not read the file %r' % node)
+ except Exception:
+ if Logs.verbose > 0:
+ Logs.error('parsing %r failed %s', node, traceback.format_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`
+ """
+ Logs.debug('preproc: scanning %s (in %s)', node.name, node.parent.name)
+
+ 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:
+ lst = format_defines(env.DEFINES)
+ lst.reverse()
+ self.lines.extend([('define', x) for x in lst])
+
+ while self.lines:
+ (token, line) = self.lines.pop()
+ if token == POPFILE:
+ self.count_files -= 1
+ self.currentnode_stack.pop()
+ continue
+
+ try:
+ 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() in self.defs:
+ state[-1] = accepted
+ else:
+ state[-1] = ignored
+ elif token == 'ifndef':
+ m = re_mac.match(line)
+ if m and m.group() in self.defs:
+ state[-1] = ignored
+ else:
+ state[-1] = accepted
+ elif token == 'include' or token == 'import':
+ (kind, inc) = extract_include(line, self.defs)
+ self.current_file = self.tryfind(inc, kind, env)
+ 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[self.define_name(line)] = line
+ except AttributeError:
+ raise PreprocError('Invalid define line %r' % line)
+ elif token == 'undef':
+ m = re_mac.match(line)
+ if m and m.group() in self.defs:
+ self.defs.__delitem__(m.group())
+ #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:
+ Logs.debug('preproc: line parsing failed (%s): %s %s', e, line, traceback.format_exc())
+
+ def define_name(self, line):
+ """
+ :param line: define line
+ :type line: string
+ :rtype: string
+ :return: the define name
+ """
+ return re_mac.match(line).group()
+
+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
+ """
+ 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)
+ return (tmp.nodes, tmp.names)
generated by cgit v1.2.1 (git 2.18.0) at 2024-11-18 14:26:33 +0000