538 lines
23 KiB
Python
538 lines
23 KiB
Python
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from . import api, model
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from .commontypes import COMMON_TYPES, resolve_common_type
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try:
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from . import _pycparser as pycparser
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except ImportError:
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import pycparser
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import weakref, re, sys
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try:
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if sys.version_info < (3,):
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import thread as _thread
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else:
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import _thread
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lock = _thread.allocate_lock()
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except ImportError:
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lock = None
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_r_comment = re.compile(r"/\*.*?\*/|//.*?$", re.DOTALL | re.MULTILINE)
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_r_define = re.compile(r"^\s*#\s*define\s+([A-Za-z_][A-Za-z_0-9]*)\s+(.*?)$",
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re.MULTILINE)
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_r_partial_enum = re.compile(r"=\s*\.\.\.\s*[,}]|\.\.\.\s*\}")
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_r_enum_dotdotdot = re.compile(r"__dotdotdot\d+__$")
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_r_partial_array = re.compile(r"\[\s*\.\.\.\s*\]")
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_r_words = re.compile(r"\w+|\S")
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_parser_cache = None
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def _get_parser():
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global _parser_cache
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if _parser_cache is None:
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_parser_cache = pycparser.CParser()
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return _parser_cache
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def _preprocess(csource):
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# Remove comments. NOTE: this only work because the cdef() section
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# should not contain any string literal!
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csource = _r_comment.sub(' ', csource)
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# Remove the "#define FOO x" lines
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macros = {}
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for match in _r_define.finditer(csource):
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macroname, macrovalue = match.groups()
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macros[macroname] = macrovalue
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csource = _r_define.sub('', csource)
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# Replace "[...]" with "[__dotdotdotarray__]"
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csource = _r_partial_array.sub('[__dotdotdotarray__]', csource)
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# Replace "...}" with "__dotdotdotNUM__}". This construction should
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# occur only at the end of enums; at the end of structs we have "...;}"
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# and at the end of vararg functions "...);". Also replace "=...[,}]"
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# with ",__dotdotdotNUM__[,}]": this occurs in the enums too, when
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# giving an unknown value.
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matches = list(_r_partial_enum.finditer(csource))
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for number, match in enumerate(reversed(matches)):
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p = match.start()
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if csource[p] == '=':
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p2 = csource.find('...', p, match.end())
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assert p2 > p
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csource = '%s,__dotdotdot%d__ %s' % (csource[:p], number,
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csource[p2+3:])
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else:
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assert csource[p:p+3] == '...'
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csource = '%s __dotdotdot%d__ %s' % (csource[:p], number,
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csource[p+3:])
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# Replace all remaining "..." with the same name, "__dotdotdot__",
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# which is declared with a typedef for the purpose of C parsing.
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return csource.replace('...', ' __dotdotdot__ '), macros
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def _common_type_names(csource):
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# Look in the source for what looks like usages of types from the
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# list of common types. A "usage" is approximated here as the
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# appearance of the word, minus a "definition" of the type, which
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# is the last word in a "typedef" statement. Approximative only
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# but should be fine for all the common types.
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look_for_words = set(COMMON_TYPES)
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look_for_words.add(';')
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look_for_words.add('typedef')
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words_used = set()
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is_typedef = False
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previous_word = ''
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for word in _r_words.findall(csource):
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if word in look_for_words:
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if word == ';':
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if is_typedef:
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words_used.discard(previous_word)
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look_for_words.discard(previous_word)
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is_typedef = False
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elif word == 'typedef':
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is_typedef = True
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else: # word in COMMON_TYPES
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words_used.add(word)
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previous_word = word
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return words_used
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class Parser(object):
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def __init__(self):
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self._declarations = {}
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self._anonymous_counter = 0
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self._structnode2type = weakref.WeakKeyDictionary()
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self._override = False
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self._packed = False
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def _parse(self, csource):
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csource, macros = _preprocess(csource)
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# XXX: for more efficiency we would need to poke into the
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# internals of CParser... the following registers the
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# typedefs, because their presence or absence influences the
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# parsing itself (but what they are typedef'ed to plays no role)
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ctn = _common_type_names(csource)
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typenames = []
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for name in sorted(self._declarations):
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if name.startswith('typedef '):
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name = name[8:]
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typenames.append(name)
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ctn.discard(name)
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typenames += sorted(ctn)
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#
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csourcelines = ['typedef int %s;' % typename for typename in typenames]
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csourcelines.append('typedef int __dotdotdot__;')
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csourcelines.append(csource)
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csource = '\n'.join(csourcelines)
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if lock is not None:
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lock.acquire() # pycparser is not thread-safe...
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try:
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ast = _get_parser().parse(csource)
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except pycparser.c_parser.ParseError as e:
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self.convert_pycparser_error(e, csource)
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finally:
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if lock is not None:
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lock.release()
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return ast, macros
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def convert_pycparser_error(self, e, csource):
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# xxx look for ":NUM:" at the start of str(e) and try to interpret
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# it as a line number
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line = None
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msg = str(e)
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if msg.startswith(':') and ':' in msg[1:]:
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linenum = msg[1:msg.find(':',1)]
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if linenum.isdigit():
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linenum = int(linenum, 10)
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csourcelines = csource.splitlines()
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if 1 <= linenum <= len(csourcelines):
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line = csourcelines[linenum-1]
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if line:
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msg = 'cannot parse "%s"\n%s' % (line.strip(), msg)
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else:
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msg = 'parse error\n%s' % (msg,)
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raise api.CDefError(msg)
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def parse(self, csource, override=False, packed=False):
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prev_override = self._override
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prev_packed = self._packed
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try:
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self._override = override
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self._packed = packed
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self._internal_parse(csource)
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finally:
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self._override = prev_override
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self._packed = prev_packed
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def _internal_parse(self, csource):
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ast, macros = self._parse(csource)
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# add the macros
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for key, value in macros.items():
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value = value.strip()
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if value != '...':
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raise api.CDefError('only supports the syntax "#define '
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'%s ..." for now (literally)' % key)
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self._declare('macro ' + key, value)
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# find the first "__dotdotdot__" and use that as a separator
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# between the repeated typedefs and the real csource
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iterator = iter(ast.ext)
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for decl in iterator:
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if decl.name == '__dotdotdot__':
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break
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#
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for decl in iterator:
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if isinstance(decl, pycparser.c_ast.Decl):
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self._parse_decl(decl)
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elif isinstance(decl, pycparser.c_ast.Typedef):
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if not decl.name:
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raise api.CDefError("typedef does not declare any name",
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decl)
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if (isinstance(decl.type.type, pycparser.c_ast.IdentifierType)
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and decl.type.type.names == ['__dotdotdot__']):
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realtype = model.unknown_type(decl.name)
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elif (isinstance(decl.type, pycparser.c_ast.PtrDecl) and
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isinstance(decl.type.type, pycparser.c_ast.TypeDecl) and
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isinstance(decl.type.type.type,
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pycparser.c_ast.IdentifierType) and
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decl.type.type.type.names == ['__dotdotdot__']):
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realtype = model.unknown_ptr_type(decl.name)
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else:
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realtype = self._get_type(decl.type, name=decl.name)
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self._declare('typedef ' + decl.name, realtype)
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else:
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raise api.CDefError("unrecognized construct", decl)
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def _parse_decl(self, decl):
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node = decl.type
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if isinstance(node, pycparser.c_ast.FuncDecl):
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tp = self._get_type(node, name=decl.name)
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assert isinstance(tp, model.RawFunctionType)
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tp = self._get_type_pointer(tp)
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self._declare('function ' + decl.name, tp)
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else:
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if isinstance(node, pycparser.c_ast.Struct):
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# XXX do we need self._declare in any of those?
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if node.decls is not None:
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self._get_struct_union_enum_type('struct', node)
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elif isinstance(node, pycparser.c_ast.Union):
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if node.decls is not None:
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self._get_struct_union_enum_type('union', node)
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elif isinstance(node, pycparser.c_ast.Enum):
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if node.values is not None:
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self._get_struct_union_enum_type('enum', node)
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elif not decl.name:
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raise api.CDefError("construct does not declare any variable",
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decl)
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#
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if decl.name:
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tp = self._get_type(node, partial_length_ok=True)
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if self._is_constant_globalvar(node):
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self._declare('constant ' + decl.name, tp)
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else:
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self._declare('variable ' + decl.name, tp)
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def parse_type(self, cdecl):
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ast, macros = self._parse('void __dummy(\n%s\n);' % cdecl)
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assert not macros
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exprnode = ast.ext[-1].type.args.params[0]
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if isinstance(exprnode, pycparser.c_ast.ID):
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raise api.CDefError("unknown identifier '%s'" % (exprnode.name,))
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return self._get_type(exprnode.type)
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def _declare(self, name, obj):
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if name in self._declarations:
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if self._declarations[name] is obj:
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return
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if not self._override:
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raise api.FFIError(
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"multiple declarations of %s (for interactive usage, "
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"try cdef(xx, override=True))" % (name,))
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assert '__dotdotdot__' not in name.split()
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self._declarations[name] = obj
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def _get_type_pointer(self, type, const=False):
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if isinstance(type, model.RawFunctionType):
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return type.as_function_pointer()
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if const:
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return model.ConstPointerType(type)
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return model.PointerType(type)
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def _get_type(self, typenode, name=None, partial_length_ok=False):
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# first, dereference typedefs, if we have it already parsed, we're good
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if (isinstance(typenode, pycparser.c_ast.TypeDecl) and
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isinstance(typenode.type, pycparser.c_ast.IdentifierType) and
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len(typenode.type.names) == 1 and
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('typedef ' + typenode.type.names[0]) in self._declarations):
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type = self._declarations['typedef ' + typenode.type.names[0]]
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return type
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#
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if isinstance(typenode, pycparser.c_ast.ArrayDecl):
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# array type
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if typenode.dim is None:
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length = None
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else:
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length = self._parse_constant(
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typenode.dim, partial_length_ok=partial_length_ok)
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return model.ArrayType(self._get_type(typenode.type), length)
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#
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if isinstance(typenode, pycparser.c_ast.PtrDecl):
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# pointer type
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const = (isinstance(typenode.type, pycparser.c_ast.TypeDecl)
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and 'const' in typenode.type.quals)
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return self._get_type_pointer(self._get_type(typenode.type), const)
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#
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if isinstance(typenode, pycparser.c_ast.TypeDecl):
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type = typenode.type
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if isinstance(type, pycparser.c_ast.IdentifierType):
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# assume a primitive type. get it from .names, but reduce
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# synonyms to a single chosen combination
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names = list(type.names)
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if names != ['signed', 'char']: # keep this unmodified
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prefixes = {}
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while names:
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name = names[0]
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if name in ('short', 'long', 'signed', 'unsigned'):
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prefixes[name] = prefixes.get(name, 0) + 1
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del names[0]
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else:
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break
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# ignore the 'signed' prefix below, and reorder the others
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newnames = []
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for prefix in ('unsigned', 'short', 'long'):
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for i in range(prefixes.get(prefix, 0)):
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newnames.append(prefix)
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if not names:
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names = ['int'] # implicitly
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if names == ['int']: # but kill it if 'short' or 'long'
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if 'short' in prefixes or 'long' in prefixes:
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names = []
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names = newnames + names
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ident = ' '.join(names)
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if ident == 'void':
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return model.void_type
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if ident == '__dotdotdot__':
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raise api.FFIError('bad usage of "..."')
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return resolve_common_type(ident)
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#
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if isinstance(type, pycparser.c_ast.Struct):
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# 'struct foobar'
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return self._get_struct_union_enum_type('struct', type, name)
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#
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if isinstance(type, pycparser.c_ast.Union):
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# 'union foobar'
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return self._get_struct_union_enum_type('union', type, name)
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#
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if isinstance(type, pycparser.c_ast.Enum):
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# 'enum foobar'
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return self._get_struct_union_enum_type('enum', type, name)
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#
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if isinstance(typenode, pycparser.c_ast.FuncDecl):
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# a function type
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return self._parse_function_type(typenode, name)
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#
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# nested anonymous structs or unions end up here
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if isinstance(typenode, pycparser.c_ast.Struct):
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return self._get_struct_union_enum_type('struct', typenode, name,
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nested=True)
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if isinstance(typenode, pycparser.c_ast.Union):
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return self._get_struct_union_enum_type('union', typenode, name,
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nested=True)
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#
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raise api.FFIError("bad or unsupported type declaration")
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def _parse_function_type(self, typenode, funcname=None):
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params = list(getattr(typenode.args, 'params', []))
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ellipsis = (
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|
len(params) > 0 and
|
||
|
|
isinstance(params[-1].type, pycparser.c_ast.TypeDecl) and
|
||
|
|
isinstance(params[-1].type.type,
|
||
|
|
pycparser.c_ast.IdentifierType) and
|
||
|
|
params[-1].type.type.names == ['__dotdotdot__'])
|
||
|
|
if ellipsis:
|
||
|
|
params.pop()
|
||
|
|
if not params:
|
||
|
|
raise api.CDefError(
|
||
|
|
"%s: a function with only '(...)' as argument"
|
||
|
|
" is not correct C" % (funcname or 'in expression'))
|
||
|
|
elif (len(params) == 1 and
|
||
|
|
isinstance(params[0].type, pycparser.c_ast.TypeDecl) and
|
||
|
|
isinstance(params[0].type.type, pycparser.c_ast.IdentifierType)
|
||
|
|
and list(params[0].type.type.names) == ['void']):
|
||
|
|
del params[0]
|
||
|
|
args = [self._as_func_arg(self._get_type(argdeclnode.type))
|
||
|
|
for argdeclnode in params]
|
||
|
|
result = self._get_type(typenode.type)
|
||
|
|
return model.RawFunctionType(tuple(args), result, ellipsis)
|
||
|
|
|
||
|
|
def _as_func_arg(self, type):
|
||
|
|
if isinstance(type, model.ArrayType):
|
||
|
|
return model.PointerType(type.item)
|
||
|
|
elif isinstance(type, model.RawFunctionType):
|
||
|
|
return type.as_function_pointer()
|
||
|
|
else:
|
||
|
|
return type
|
||
|
|
|
||
|
|
def _is_constant_globalvar(self, typenode):
|
||
|
|
if isinstance(typenode, pycparser.c_ast.PtrDecl):
|
||
|
|
return 'const' in typenode.quals
|
||
|
|
if isinstance(typenode, pycparser.c_ast.TypeDecl):
|
||
|
|
return 'const' in typenode.quals
|
||
|
|
return False
|
||
|
|
|
||
|
|
def _get_struct_union_enum_type(self, kind, type, name=None, nested=False):
|
||
|
|
# First, a level of caching on the exact 'type' node of the AST.
|
||
|
|
# This is obscure, but needed because pycparser "unrolls" declarations
|
||
|
|
# such as "typedef struct { } foo_t, *foo_p" and we end up with
|
||
|
|
# an AST that is not a tree, but a DAG, with the "type" node of the
|
||
|
|
# two branches foo_t and foo_p of the trees being the same node.
|
||
|
|
# It's a bit silly but detecting "DAG-ness" in the AST tree seems
|
||
|
|
# to be the only way to distinguish this case from two independent
|
||
|
|
# structs. See test_struct_with_two_usages.
|
||
|
|
try:
|
||
|
|
return self._structnode2type[type]
|
||
|
|
except KeyError:
|
||
|
|
pass
|
||
|
|
#
|
||
|
|
# Note that this must handle parsing "struct foo" any number of
|
||
|
|
# times and always return the same StructType object. Additionally,
|
||
|
|
# one of these times (not necessarily the first), the fields of
|
||
|
|
# the struct can be specified with "struct foo { ...fields... }".
|
||
|
|
# If no name is given, then we have to create a new anonymous struct
|
||
|
|
# with no caching; in this case, the fields are either specified
|
||
|
|
# right now or never.
|
||
|
|
#
|
||
|
|
force_name = name
|
||
|
|
name = type.name
|
||
|
|
#
|
||
|
|
# get the type or create it if needed
|
||
|
|
if name is None:
|
||
|
|
# 'force_name' is used to guess a more readable name for
|
||
|
|
# anonymous structs, for the common case "typedef struct { } foo".
|
||
|
|
if force_name is not None:
|
||
|
|
explicit_name = '$%s' % force_name
|
||
|
|
else:
|
||
|
|
self._anonymous_counter += 1
|
||
|
|
explicit_name = '$%d' % self._anonymous_counter
|
||
|
|
tp = None
|
||
|
|
else:
|
||
|
|
explicit_name = name
|
||
|
|
key = '%s %s' % (kind, name)
|
||
|
|
tp = self._declarations.get(key, None)
|
||
|
|
#
|
||
|
|
if tp is None:
|
||
|
|
if kind == 'struct':
|
||
|
|
tp = model.StructType(explicit_name, None, None, None)
|
||
|
|
elif kind == 'union':
|
||
|
|
tp = model.UnionType(explicit_name, None, None, None)
|
||
|
|
elif kind == 'enum':
|
||
|
|
tp = self._build_enum_type(explicit_name, type.values)
|
||
|
|
else:
|
||
|
|
raise AssertionError("kind = %r" % (kind,))
|
||
|
|
if name is not None:
|
||
|
|
self._declare(key, tp)
|
||
|
|
else:
|
||
|
|
if kind == 'enum' and type.values is not None:
|
||
|
|
raise NotImplementedError(
|
||
|
|
"enum %s: the '{}' declaration should appear on the first "
|
||
|
|
"time the enum is mentioned, not later" % explicit_name)
|
||
|
|
if not tp.forcename:
|
||
|
|
tp.force_the_name(force_name)
|
||
|
|
if tp.forcename and '$' in tp.name:
|
||
|
|
self._declare('anonymous %s' % tp.forcename, tp)
|
||
|
|
#
|
||
|
|
self._structnode2type[type] = tp
|
||
|
|
#
|
||
|
|
# enums: done here
|
||
|
|
if kind == 'enum':
|
||
|
|
return tp
|
||
|
|
#
|
||
|
|
# is there a 'type.decls'? If yes, then this is the place in the
|
||
|
|
# C sources that declare the fields. If no, then just return the
|
||
|
|
# existing type, possibly still incomplete.
|
||
|
|
if type.decls is None:
|
||
|
|
return tp
|
||
|
|
#
|
||
|
|
if tp.fldnames is not None:
|
||
|
|
raise api.CDefError("duplicate declaration of struct %s" % name)
|
||
|
|
fldnames = []
|
||
|
|
fldtypes = []
|
||
|
|
fldbitsize = []
|
||
|
|
for decl in type.decls:
|
||
|
|
if (isinstance(decl.type, pycparser.c_ast.IdentifierType) and
|
||
|
|
''.join(decl.type.names) == '__dotdotdot__'):
|
||
|
|
# XXX pycparser is inconsistent: 'names' should be a list
|
||
|
|
# of strings, but is sometimes just one string. Use
|
||
|
|
# str.join() as a way to cope with both.
|
||
|
|
self._make_partial(tp, nested)
|
||
|
|
continue
|
||
|
|
if decl.bitsize is None:
|
||
|
|
bitsize = -1
|
||
|
|
else:
|
||
|
|
bitsize = self._parse_constant(decl.bitsize)
|
||
|
|
self._partial_length = False
|
||
|
|
type = self._get_type(decl.type, partial_length_ok=True)
|
||
|
|
if self._partial_length:
|
||
|
|
self._make_partial(tp, nested)
|
||
|
|
if isinstance(type, model.StructType) and type.partial:
|
||
|
|
self._make_partial(tp, nested)
|
||
|
|
fldnames.append(decl.name or '')
|
||
|
|
fldtypes.append(type)
|
||
|
|
fldbitsize.append(bitsize)
|
||
|
|
tp.fldnames = tuple(fldnames)
|
||
|
|
tp.fldtypes = tuple(fldtypes)
|
||
|
|
tp.fldbitsize = tuple(fldbitsize)
|
||
|
|
if fldbitsize != [-1] * len(fldbitsize):
|
||
|
|
if isinstance(tp, model.StructType) and tp.partial:
|
||
|
|
raise NotImplementedError("%s: using both bitfields and '...;'"
|
||
|
|
% (tp,))
|
||
|
|
tp.packed = self._packed
|
||
|
|
return tp
|
||
|
|
|
||
|
|
def _make_partial(self, tp, nested):
|
||
|
|
if not isinstance(tp, model.StructOrUnion):
|
||
|
|
raise api.CDefError("%s cannot be partial" % (tp,))
|
||
|
|
if not tp.has_c_name() and not nested:
|
||
|
|
raise NotImplementedError("%s is partial but has no C name" %(tp,))
|
||
|
|
tp.partial = True
|
||
|
|
|
||
|
|
def _parse_constant(self, exprnode, partial_length_ok=False):
|
||
|
|
# for now, limited to expressions that are an immediate number
|
||
|
|
# or negative number
|
||
|
|
if isinstance(exprnode, pycparser.c_ast.Constant):
|
||
|
|
return int(exprnode.value, 0)
|
||
|
|
#
|
||
|
|
if (isinstance(exprnode, pycparser.c_ast.UnaryOp) and
|
||
|
|
exprnode.op == '-'):
|
||
|
|
return -self._parse_constant(exprnode.expr)
|
||
|
|
#
|
||
|
|
if partial_length_ok:
|
||
|
|
if (isinstance(exprnode, pycparser.c_ast.ID) and
|
||
|
|
exprnode.name == '__dotdotdotarray__'):
|
||
|
|
self._partial_length = True
|
||
|
|
return '...'
|
||
|
|
#
|
||
|
|
raise api.FFIError("unsupported expression: expected a "
|
||
|
|
"simple numeric constant")
|
||
|
|
|
||
|
|
def _build_enum_type(self, explicit_name, decls):
|
||
|
|
if decls is not None:
|
||
|
|
enumerators1 = [enum.name for enum in decls.enumerators]
|
||
|
|
enumerators = [s for s in enumerators1
|
||
|
|
if not _r_enum_dotdotdot.match(s)]
|
||
|
|
partial = len(enumerators) < len(enumerators1)
|
||
|
|
enumerators = tuple(enumerators)
|
||
|
|
enumvalues = []
|
||
|
|
nextenumvalue = 0
|
||
|
|
for enum in decls.enumerators[:len(enumerators)]:
|
||
|
|
if enum.value is not None:
|
||
|
|
nextenumvalue = self._parse_constant(enum.value)
|
||
|
|
enumvalues.append(nextenumvalue)
|
||
|
|
nextenumvalue += 1
|
||
|
|
enumvalues = tuple(enumvalues)
|
||
|
|
tp = model.EnumType(explicit_name, enumerators, enumvalues)
|
||
|
|
tp.partial = partial
|
||
|
|
else: # opaque enum
|
||
|
|
tp = model.EnumType(explicit_name, (), ())
|
||
|
|
return tp
|
||
|
|
|
||
|
|
def include(self, other):
|
||
|
|
for name, tp in other._declarations.items():
|
||
|
|
kind = name.split(' ', 1)[0]
|
||
|
|
if kind in ('typedef', 'struct', 'union', 'enum'):
|
||
|
|
self._declare(name, tp)
|