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1016 lines
44 KiB
Python
1016 lines
44 KiB
Python
from . import model
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from .commontypes import COMMON_TYPES, resolve_common_type
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from .error import FFIError, CDefError
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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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def _workaround_for_static_import_finders():
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# Issue #392: packaging tools like cx_Freeze can not find these
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# because pycparser uses exec dynamic import. This is an obscure
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# workaround. This function is never called.
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import pycparser.yacctab
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import pycparser.lextab
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CDEF_SOURCE_STRING = "<cdef source string>"
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_r_comment = re.compile(r"/\*.*?\*/|//([^\n\\]|\\.)*?$",
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re.DOTALL | re.MULTILINE)
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_r_define = re.compile(r"^\s*#\s*define\s+([A-Za-z_][A-Za-z_0-9]*)"
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r"\b((?:[^\n\\]|\\.)*?)$",
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re.DOTALL | re.MULTILINE)
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_r_line_directive = re.compile(r"^[ \t]*#[ \t]*(?:line|\d+)\b.*$", re.MULTILINE)
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_r_partial_enum = re.compile(r"=\s*\.\.\.\s*[,}]|\.\.\.\s*\}")
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_r_enum_dotdotdot = re.compile(r"__dotdotdot\d+__$")
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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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_r_int_literal = re.compile(r"-?0?x?[0-9a-f]+[lu]*$", re.IGNORECASE)
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_r_stdcall1 = re.compile(r"\b(__stdcall|WINAPI)\b")
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_r_stdcall2 = re.compile(r"[(]\s*(__stdcall|WINAPI)\b")
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_r_cdecl = re.compile(r"\b__cdecl\b")
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_r_extern_python = re.compile(r'\bextern\s*"'
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r'(Python|Python\s*\+\s*C|C\s*\+\s*Python)"\s*.')
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_r_star_const_space = re.compile( # matches "* const "
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r"[*]\s*((const|volatile|restrict)\b\s*)+")
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_r_int_dotdotdot = re.compile(r"(\b(int|long|short|signed|unsigned|char)\s*)+"
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r"\.\.\.")
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_r_float_dotdotdot = re.compile(r"\b(double|float)\s*\.\.\.")
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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 _workaround_for_old_pycparser(csource):
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# Workaround for a pycparser issue (fixed between pycparser 2.10 and
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# 2.14): "char*const***" gives us a wrong syntax tree, the same as
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# for "char***(*const)". This means we can't tell the difference
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# afterwards. But "char(*const(***))" gives us the right syntax
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# tree. The issue only occurs if there are several stars in
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# sequence with no parenthesis in between, just possibly qualifiers.
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# Attempt to fix it by adding some parentheses in the source: each
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# time we see "* const" or "* const *", we add an opening
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# parenthesis before each star---the hard part is figuring out where
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# to close them.
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parts = []
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while True:
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match = _r_star_const_space.search(csource)
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if not match:
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break
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#print repr(''.join(parts)+csource), '=>',
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parts.append(csource[:match.start()])
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parts.append('('); closing = ')'
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parts.append(match.group()) # e.g. "* const "
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endpos = match.end()
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if csource.startswith('*', endpos):
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parts.append('('); closing += ')'
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level = 0
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i = endpos
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while i < len(csource):
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c = csource[i]
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if c == '(':
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level += 1
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elif c == ')':
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if level == 0:
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break
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level -= 1
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elif c in ',;=':
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if level == 0:
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break
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i += 1
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csource = csource[endpos:i] + closing + csource[i:]
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#print repr(''.join(parts)+csource)
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parts.append(csource)
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return ''.join(parts)
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def _preprocess_extern_python(csource):
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# input: `extern "Python" int foo(int);` or
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# `extern "Python" { int foo(int); }`
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# output:
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# void __cffi_extern_python_start;
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# int foo(int);
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# void __cffi_extern_python_stop;
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#
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# input: `extern "Python+C" int foo(int);`
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# output:
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# void __cffi_extern_python_plus_c_start;
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# int foo(int);
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# void __cffi_extern_python_stop;
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parts = []
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while True:
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match = _r_extern_python.search(csource)
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if not match:
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break
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endpos = match.end() - 1
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#print
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#print ''.join(parts)+csource
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#print '=>'
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parts.append(csource[:match.start()])
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if 'C' in match.group(1):
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parts.append('void __cffi_extern_python_plus_c_start; ')
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else:
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parts.append('void __cffi_extern_python_start; ')
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if csource[endpos] == '{':
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# grouping variant
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closing = csource.find('}', endpos)
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if closing < 0:
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raise CDefError("'extern \"Python\" {': no '}' found")
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if csource.find('{', endpos + 1, closing) >= 0:
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raise NotImplementedError("cannot use { } inside a block "
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"'extern \"Python\" { ... }'")
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parts.append(csource[endpos+1:closing])
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csource = csource[closing+1:]
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else:
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# non-grouping variant
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semicolon = csource.find(';', endpos)
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if semicolon < 0:
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raise CDefError("'extern \"Python\": no ';' found")
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parts.append(csource[endpos:semicolon+1])
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csource = csource[semicolon+1:]
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parts.append(' void __cffi_extern_python_stop;')
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#print ''.join(parts)+csource
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#print
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parts.append(csource)
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return ''.join(parts)
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def _warn_for_string_literal(csource):
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if '"' not in csource:
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return
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for line in csource.splitlines():
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if '"' in line and not line.lstrip().startswith('#'):
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import warnings
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warnings.warn("String literal found in cdef() or type source. "
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"String literals are ignored here, but you should "
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"remove them anyway because some character sequences "
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"confuse pre-parsing.")
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break
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def _warn_for_non_extern_non_static_global_variable(decl):
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if not decl.storage:
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import warnings
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warnings.warn("Global variable '%s' in cdef(): for consistency "
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"with C it should have a storage class specifier "
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"(usually 'extern')" % (decl.name,))
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def _remove_line_directives(csource):
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# _r_line_directive matches whole lines, without the final \n, if they
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# start with '#line' with some spacing allowed, or '#NUMBER'. This
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# function stores them away and replaces them with exactly the string
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# '#line@N', where N is the index in the list 'line_directives'.
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line_directives = []
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def replace(m):
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i = len(line_directives)
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line_directives.append(m.group())
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return '#line@%d' % i
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csource = _r_line_directive.sub(replace, csource)
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return csource, line_directives
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def _put_back_line_directives(csource, line_directives):
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def replace(m):
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s = m.group()
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if not s.startswith('#line@'):
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raise AssertionError("unexpected #line directive "
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"(should have been processed and removed")
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return line_directives[int(s[6:])]
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return _r_line_directive.sub(replace, csource)
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def _preprocess(csource):
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# First, remove the lines of the form '#line N "filename"' because
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# the "filename" part could confuse the rest
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csource, line_directives = _remove_line_directives(csource)
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# Remove comments. NOTE: this only work because the cdef() section
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# should not contain any string literals (except in line directives)!
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def replace_keeping_newlines(m):
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return ' ' + m.group().count('\n') * '\n'
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csource = _r_comment.sub(replace_keeping_newlines, 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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macrovalue = macrovalue.replace('\\\n', '').strip()
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macros[macroname] = macrovalue
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csource = _r_define.sub('', csource)
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#
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if pycparser.__version__ < '2.14':
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csource = _workaround_for_old_pycparser(csource)
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#
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# BIG HACK: replace WINAPI or __stdcall with "volatile const".
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# It doesn't make sense for the return type of a function to be
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# "volatile volatile const", so we abuse it to detect __stdcall...
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# Hack number 2 is that "int(volatile *fptr)();" is not valid C
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# syntax, so we place the "volatile" before the opening parenthesis.
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csource = _r_stdcall2.sub(' volatile volatile const(', csource)
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csource = _r_stdcall1.sub(' volatile volatile const ', csource)
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csource = _r_cdecl.sub(' ', csource)
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#
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# Replace `extern "Python"` with start/end markers
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csource = _preprocess_extern_python(csource)
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#
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# Now there should not be any string literal left; warn if we get one
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_warn_for_string_literal(csource)
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#
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# Replace "[...]" with "[__dotdotdotarray__]"
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csource = _r_partial_array.sub('[__dotdotdotarray__]', csource)
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#
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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 "int ..." or "unsigned long int..." with "__dotdotdotint__"
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csource = _r_int_dotdotdot.sub(' __dotdotdotint__ ', csource)
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# Replace "float ..." or "double..." with "__dotdotdotfloat__"
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csource = _r_float_dotdotdot.sub(' __dotdotdotfloat__ ', csource)
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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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csource = csource.replace('...', ' __dotdotdot__ ')
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# Finally, put back the line directives
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csource = _put_back_line_directives(csource, line_directives)
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return csource, 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(',')
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look_for_words.add('(')
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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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paren = 0
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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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paren = 0
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elif word == '(':
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paren += 1
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elif word == ')':
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paren -= 1
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elif word == ',':
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if is_typedef and paren == 0:
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words_used.discard(previous_word)
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look_for_words.discard(previous_word)
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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._included_declarations = set()
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self._anonymous_counter = 0
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self._structnode2type = weakref.WeakKeyDictionary()
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self._options = {}
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self._int_constants = {}
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self._recomplete = []
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self._uses_new_feature = None
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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 = []
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csourcelines.append('# 1 "<cdef automatic initialization code>"')
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for typename in typenames:
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csourcelines.append('typedef int %s;' % typename)
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csourcelines.append('typedef int __dotdotdotint__, __dotdotdotfloat__,'
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' __dotdotdot__;')
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# this forces pycparser to consider the following in the file
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# called <cdef source string> from line 1
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csourcelines.append('# 1 "%s"' % (CDEF_SOURCE_STRING,))
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csourcelines.append(csource)
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csourcelines.append('') # see test_missing_newline_bug
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fullcsource = '\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(fullcsource)
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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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# csource will be used to find buggy source text
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return ast, macros, csource
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def _convert_pycparser_error(self, e, csource):
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# xxx look for "<cdef source string>:NUM:" at the start of str(e)
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# and interpret that as a line number. This will not work if
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# the user gives explicit ``# NUM "FILE"`` directives.
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line = None
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msg = str(e)
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match = re.match(r"%s:(\d+):" % (CDEF_SOURCE_STRING,), msg)
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if match:
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linenum = int(match.group(1), 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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return line
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def convert_pycparser_error(self, e, csource):
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line = self._convert_pycparser_error(e, csource)
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msg = str(e)
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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 CDefError(msg)
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def parse(self, csource, override=False, packed=False, pack=None,
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dllexport=False):
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if packed:
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if packed != True:
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raise ValueError("'packed' should be False or True; use "
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"'pack' to give another value")
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if pack:
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raise ValueError("cannot give both 'pack' and 'packed'")
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pack = 1
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elif pack:
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if pack & (pack - 1):
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raise ValueError("'pack' must be a power of two, not %r" %
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(pack,))
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else:
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pack = 0
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prev_options = self._options
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try:
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self._options = {'override': override,
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'packed': pack,
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'dllexport': dllexport}
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self._internal_parse(csource)
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finally:
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self._options = prev_options
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def _internal_parse(self, csource):
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ast, macros, csource = self._parse(csource)
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# add the macros
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self._process_macros(macros)
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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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else:
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assert 0
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current_decl = None
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#
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try:
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self._inside_extern_python = '__cffi_extern_python_stop'
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for decl in iterator:
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current_decl = decl
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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 CDefError("typedef does not declare any name",
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decl)
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quals = 0
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if (isinstance(decl.type.type, pycparser.c_ast.IdentifierType) and
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decl.type.type.names[-1].startswith('__dotdotdot')):
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realtype = self._get_unknown_type(decl)
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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[-1].startswith('__dotdotdot')):
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realtype = self._get_unknown_ptr_type(decl)
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else:
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realtype, quals = self._get_type_and_quals(
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decl.type, name=decl.name, partial_length_ok=True,
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typedef_example="*(%s *)0" % (decl.name,))
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self._declare('typedef ' + decl.name, realtype, quals=quals)
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elif decl.__class__.__name__ == 'Pragma':
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# skip pragma, only in pycparser 2.15
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import warnings
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warnings.warn(
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"#pragma in cdef() are entirely ignored. "
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"They should be removed for now, otherwise your "
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"code might behave differently in a future version "
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"of CFFI if #pragma support gets added. Note that "
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"'#pragma pack' needs to be replaced with the "
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"'packed' keyword argument to cdef().")
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else:
|
|
raise CDefError("unexpected <%s>: this construct is valid "
|
|
"C but not valid in cdef()" %
|
|
decl.__class__.__name__, decl)
|
|
except CDefError as e:
|
|
if len(e.args) == 1:
|
|
e.args = e.args + (current_decl,)
|
|
raise
|
|
except FFIError as e:
|
|
msg = self._convert_pycparser_error(e, csource)
|
|
if msg:
|
|
e.args = (e.args[0] + "\n *** Err: %s" % msg,)
|
|
raise
|
|
|
|
def _add_constants(self, key, val):
|
|
if key in self._int_constants:
|
|
if self._int_constants[key] == val:
|
|
return # ignore identical double declarations
|
|
raise FFIError(
|
|
"multiple declarations of constant: %s" % (key,))
|
|
self._int_constants[key] = val
|
|
|
|
def _add_integer_constant(self, name, int_str):
|
|
int_str = int_str.lower().rstrip("ul")
|
|
neg = int_str.startswith('-')
|
|
if neg:
|
|
int_str = int_str[1:]
|
|
# "010" is not valid oct in py3
|
|
if (int_str.startswith("0") and int_str != '0'
|
|
and not int_str.startswith("0x")):
|
|
int_str = "0o" + int_str[1:]
|
|
pyvalue = int(int_str, 0)
|
|
if neg:
|
|
pyvalue = -pyvalue
|
|
self._add_constants(name, pyvalue)
|
|
self._declare('macro ' + name, pyvalue)
|
|
|
|
def _process_macros(self, macros):
|
|
for key, value in macros.items():
|
|
value = value.strip()
|
|
if _r_int_literal.match(value):
|
|
self._add_integer_constant(key, value)
|
|
elif value == '...':
|
|
self._declare('macro ' + key, value)
|
|
else:
|
|
raise CDefError(
|
|
'only supports one of the following syntax:\n'
|
|
' #define %s ... (literally dot-dot-dot)\n'
|
|
' #define %s NUMBER (with NUMBER an integer'
|
|
' constant, decimal/hex/octal)\n'
|
|
'got:\n'
|
|
' #define %s %s'
|
|
% (key, key, key, value))
|
|
|
|
def _declare_function(self, tp, quals, decl):
|
|
tp = self._get_type_pointer(tp, quals)
|
|
if self._options.get('dllexport'):
|
|
tag = 'dllexport_python '
|
|
elif self._inside_extern_python == '__cffi_extern_python_start':
|
|
tag = 'extern_python '
|
|
elif self._inside_extern_python == '__cffi_extern_python_plus_c_start':
|
|
tag = 'extern_python_plus_c '
|
|
else:
|
|
tag = 'function '
|
|
self._declare(tag + decl.name, tp)
|
|
|
|
def _parse_decl(self, decl):
|
|
node = decl.type
|
|
if isinstance(node, pycparser.c_ast.FuncDecl):
|
|
tp, quals = self._get_type_and_quals(node, name=decl.name)
|
|
assert isinstance(tp, model.RawFunctionType)
|
|
self._declare_function(tp, quals, decl)
|
|
else:
|
|
if isinstance(node, pycparser.c_ast.Struct):
|
|
self._get_struct_union_enum_type('struct', node)
|
|
elif isinstance(node, pycparser.c_ast.Union):
|
|
self._get_struct_union_enum_type('union', node)
|
|
elif isinstance(node, pycparser.c_ast.Enum):
|
|
self._get_struct_union_enum_type('enum', node)
|
|
elif not decl.name:
|
|
raise CDefError("construct does not declare any variable",
|
|
decl)
|
|
#
|
|
if decl.name:
|
|
tp, quals = self._get_type_and_quals(node,
|
|
partial_length_ok=True)
|
|
if tp.is_raw_function:
|
|
self._declare_function(tp, quals, decl)
|
|
elif (tp.is_integer_type() and
|
|
hasattr(decl, 'init') and
|
|
hasattr(decl.init, 'value') and
|
|
_r_int_literal.match(decl.init.value)):
|
|
self._add_integer_constant(decl.name, decl.init.value)
|
|
elif (tp.is_integer_type() and
|
|
isinstance(decl.init, pycparser.c_ast.UnaryOp) and
|
|
decl.init.op == '-' and
|
|
hasattr(decl.init.expr, 'value') and
|
|
_r_int_literal.match(decl.init.expr.value)):
|
|
self._add_integer_constant(decl.name,
|
|
'-' + decl.init.expr.value)
|
|
elif (tp is model.void_type and
|
|
decl.name.startswith('__cffi_extern_python_')):
|
|
# hack: `extern "Python"` in the C source is replaced
|
|
# with "void __cffi_extern_python_start;" and
|
|
# "void __cffi_extern_python_stop;"
|
|
self._inside_extern_python = decl.name
|
|
else:
|
|
if self._inside_extern_python !='__cffi_extern_python_stop':
|
|
raise CDefError(
|
|
"cannot declare constants or "
|
|
"variables with 'extern \"Python\"'")
|
|
if (quals & model.Q_CONST) and not tp.is_array_type:
|
|
self._declare('constant ' + decl.name, tp, quals=quals)
|
|
else:
|
|
_warn_for_non_extern_non_static_global_variable(decl)
|
|
self._declare('variable ' + decl.name, tp, quals=quals)
|
|
|
|
def parse_type(self, cdecl):
|
|
return self.parse_type_and_quals(cdecl)[0]
|
|
|
|
def parse_type_and_quals(self, cdecl):
|
|
ast, macros = self._parse('void __dummy(\n%s\n);' % cdecl)[:2]
|
|
assert not macros
|
|
exprnode = ast.ext[-1].type.args.params[0]
|
|
if isinstance(exprnode, pycparser.c_ast.ID):
|
|
raise CDefError("unknown identifier '%s'" % (exprnode.name,))
|
|
return self._get_type_and_quals(exprnode.type)
|
|
|
|
def _declare(self, name, obj, included=False, quals=0):
|
|
if name in self._declarations:
|
|
prevobj, prevquals = self._declarations[name]
|
|
if prevobj is obj and prevquals == quals:
|
|
return
|
|
if not self._options.get('override'):
|
|
raise FFIError(
|
|
"multiple declarations of %s (for interactive usage, "
|
|
"try cdef(xx, override=True))" % (name,))
|
|
assert '__dotdotdot__' not in name.split()
|
|
self._declarations[name] = (obj, quals)
|
|
if included:
|
|
self._included_declarations.add(obj)
|
|
|
|
def _extract_quals(self, type):
|
|
quals = 0
|
|
if isinstance(type, (pycparser.c_ast.TypeDecl,
|
|
pycparser.c_ast.PtrDecl)):
|
|
if 'const' in type.quals:
|
|
quals |= model.Q_CONST
|
|
if 'volatile' in type.quals:
|
|
quals |= model.Q_VOLATILE
|
|
if 'restrict' in type.quals:
|
|
quals |= model.Q_RESTRICT
|
|
return quals
|
|
|
|
def _get_type_pointer(self, type, quals, declname=None):
|
|
if isinstance(type, model.RawFunctionType):
|
|
return type.as_function_pointer()
|
|
if (isinstance(type, model.StructOrUnionOrEnum) and
|
|
type.name.startswith('$') and type.name[1:].isdigit() and
|
|
type.forcename is None and declname is not None):
|
|
return model.NamedPointerType(type, declname, quals)
|
|
return model.PointerType(type, quals)
|
|
|
|
def _get_type_and_quals(self, typenode, name=None, partial_length_ok=False,
|
|
typedef_example=None):
|
|
# first, dereference typedefs, if we have it already parsed, we're good
|
|
if (isinstance(typenode, pycparser.c_ast.TypeDecl) and
|
|
isinstance(typenode.type, pycparser.c_ast.IdentifierType) and
|
|
len(typenode.type.names) == 1 and
|
|
('typedef ' + typenode.type.names[0]) in self._declarations):
|
|
tp, quals = self._declarations['typedef ' + typenode.type.names[0]]
|
|
quals |= self._extract_quals(typenode)
|
|
return tp, quals
|
|
#
|
|
if isinstance(typenode, pycparser.c_ast.ArrayDecl):
|
|
# array type
|
|
if typenode.dim is None:
|
|
length = None
|
|
else:
|
|
length = self._parse_constant(
|
|
typenode.dim, partial_length_ok=partial_length_ok)
|
|
# a hack: in 'typedef int foo_t[...][...];', don't use '...' as
|
|
# the length but use directly the C expression that would be
|
|
# generated by recompiler.py. This lets the typedef be used in
|
|
# many more places within recompiler.py
|
|
if typedef_example is not None:
|
|
if length == '...':
|
|
length = '_cffi_array_len(%s)' % (typedef_example,)
|
|
typedef_example = "*" + typedef_example
|
|
#
|
|
tp, quals = self._get_type_and_quals(typenode.type,
|
|
partial_length_ok=partial_length_ok,
|
|
typedef_example=typedef_example)
|
|
return model.ArrayType(tp, length), quals
|
|
#
|
|
if isinstance(typenode, pycparser.c_ast.PtrDecl):
|
|
# pointer type
|
|
itemtype, itemquals = self._get_type_and_quals(typenode.type)
|
|
tp = self._get_type_pointer(itemtype, itemquals, declname=name)
|
|
quals = self._extract_quals(typenode)
|
|
return tp, quals
|
|
#
|
|
if isinstance(typenode, pycparser.c_ast.TypeDecl):
|
|
quals = self._extract_quals(typenode)
|
|
type = typenode.type
|
|
if isinstance(type, pycparser.c_ast.IdentifierType):
|
|
# assume a primitive type. get it from .names, but reduce
|
|
# synonyms to a single chosen combination
|
|
names = list(type.names)
|
|
if names != ['signed', 'char']: # keep this unmodified
|
|
prefixes = {}
|
|
while names:
|
|
name = names[0]
|
|
if name in ('short', 'long', 'signed', 'unsigned'):
|
|
prefixes[name] = prefixes.get(name, 0) + 1
|
|
del names[0]
|
|
else:
|
|
break
|
|
# ignore the 'signed' prefix below, and reorder the others
|
|
newnames = []
|
|
for prefix in ('unsigned', 'short', 'long'):
|
|
for i in range(prefixes.get(prefix, 0)):
|
|
newnames.append(prefix)
|
|
if not names:
|
|
names = ['int'] # implicitly
|
|
if names == ['int']: # but kill it if 'short' or 'long'
|
|
if 'short' in prefixes or 'long' in prefixes:
|
|
names = []
|
|
names = newnames + names
|
|
ident = ' '.join(names)
|
|
if ident == 'void':
|
|
return model.void_type, quals
|
|
if ident == '__dotdotdot__':
|
|
raise FFIError(':%d: bad usage of "..."' %
|
|
typenode.coord.line)
|
|
tp0, quals0 = resolve_common_type(self, ident)
|
|
return tp0, (quals | quals0)
|
|
#
|
|
if isinstance(type, pycparser.c_ast.Struct):
|
|
# 'struct foobar'
|
|
tp = self._get_struct_union_enum_type('struct', type, name)
|
|
return tp, quals
|
|
#
|
|
if isinstance(type, pycparser.c_ast.Union):
|
|
# 'union foobar'
|
|
tp = self._get_struct_union_enum_type('union', type, name)
|
|
return tp, quals
|
|
#
|
|
if isinstance(type, pycparser.c_ast.Enum):
|
|
# 'enum foobar'
|
|
tp = self._get_struct_union_enum_type('enum', type, name)
|
|
return tp, quals
|
|
#
|
|
if isinstance(typenode, pycparser.c_ast.FuncDecl):
|
|
# a function type
|
|
return self._parse_function_type(typenode, name), 0
|
|
#
|
|
# nested anonymous structs or unions end up here
|
|
if isinstance(typenode, pycparser.c_ast.Struct):
|
|
return self._get_struct_union_enum_type('struct', typenode, name,
|
|
nested=True), 0
|
|
if isinstance(typenode, pycparser.c_ast.Union):
|
|
return self._get_struct_union_enum_type('union', typenode, name,
|
|
nested=True), 0
|
|
#
|
|
raise FFIError(":%d: bad or unsupported type declaration" %
|
|
typenode.coord.line)
|
|
|
|
def _parse_function_type(self, typenode, funcname=None):
|
|
params = list(getattr(typenode.args, 'params', []))
|
|
for i, arg in enumerate(params):
|
|
if not hasattr(arg, 'type'):
|
|
raise CDefError("%s arg %d: unknown type '%s'"
|
|
" (if you meant to use the old C syntax of giving"
|
|
" untyped arguments, it is not supported)"
|
|
% (funcname or 'in expression', i + 1,
|
|
getattr(arg, 'name', '?')))
|
|
ellipsis = (
|
|
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 CDefError(
|
|
"%s: a function with only '(...)' as argument"
|
|
" is not correct C" % (funcname or 'in expression'))
|
|
args = [self._as_func_arg(*self._get_type_and_quals(argdeclnode.type))
|
|
for argdeclnode in params]
|
|
if not ellipsis and args == [model.void_type]:
|
|
args = []
|
|
result, quals = self._get_type_and_quals(typenode.type)
|
|
# the 'quals' on the result type are ignored. HACK: we absure them
|
|
# to detect __stdcall functions: we textually replace "__stdcall"
|
|
# with "volatile volatile const" above.
|
|
abi = None
|
|
if hasattr(typenode.type, 'quals'): # else, probable syntax error anyway
|
|
if typenode.type.quals[-3:] == ['volatile', 'volatile', 'const']:
|
|
abi = '__stdcall'
|
|
return model.RawFunctionType(tuple(args), result, ellipsis, abi)
|
|
|
|
def _as_func_arg(self, type, quals):
|
|
if isinstance(type, model.ArrayType):
|
|
return model.PointerType(type.item, quals)
|
|
elif isinstance(type, model.RawFunctionType):
|
|
return type.as_function_pointer()
|
|
else:
|
|
return type
|
|
|
|
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, 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':
|
|
if explicit_name == '__dotdotdot__':
|
|
raise CDefError("Enums cannot be declared with ...")
|
|
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 CDefError("duplicate declaration of struct %s" % name)
|
|
fldnames = []
|
|
fldtypes = []
|
|
fldbitsize = []
|
|
fldquals = []
|
|
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, fqual = self._get_type_and_quals(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)
|
|
fldquals.append(fqual)
|
|
tp.fldnames = tuple(fldnames)
|
|
tp.fldtypes = tuple(fldtypes)
|
|
tp.fldbitsize = tuple(fldbitsize)
|
|
tp.fldquals = tuple(fldquals)
|
|
if fldbitsize != [-1] * len(fldbitsize):
|
|
if isinstance(tp, model.StructType) and tp.partial:
|
|
raise NotImplementedError("%s: using both bitfields and '...;'"
|
|
% (tp,))
|
|
tp.packed = self._options.get('packed')
|
|
if tp.completed: # must be re-completed: it is not opaque any more
|
|
tp.completed = 0
|
|
self._recomplete.append(tp)
|
|
return tp
|
|
|
|
def _make_partial(self, tp, nested):
|
|
if not isinstance(tp, model.StructOrUnion):
|
|
raise 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 positive/negative number
|
|
if isinstance(exprnode, pycparser.c_ast.Constant):
|
|
s = exprnode.value
|
|
if '0' <= s[0] <= '9':
|
|
s = s.rstrip('uUlL')
|
|
try:
|
|
if s.startswith('0'):
|
|
return int(s, 8)
|
|
else:
|
|
return int(s, 10)
|
|
except ValueError:
|
|
if len(s) > 1:
|
|
if s.lower()[0:2] == '0x':
|
|
return int(s, 16)
|
|
elif s.lower()[0:2] == '0b':
|
|
return int(s, 2)
|
|
raise CDefError("invalid constant %r" % (s,))
|
|
elif s[0] == "'" and s[-1] == "'" and (
|
|
len(s) == 3 or (len(s) == 4 and s[1] == "\\")):
|
|
return ord(s[-2])
|
|
else:
|
|
raise CDefError("invalid constant %r" % (s,))
|
|
#
|
|
if (isinstance(exprnode, pycparser.c_ast.UnaryOp) and
|
|
exprnode.op == '+'):
|
|
return self._parse_constant(exprnode.expr)
|
|
#
|
|
if (isinstance(exprnode, pycparser.c_ast.UnaryOp) and
|
|
exprnode.op == '-'):
|
|
return -self._parse_constant(exprnode.expr)
|
|
# load previously defined int constant
|
|
if (isinstance(exprnode, pycparser.c_ast.ID) and
|
|
exprnode.name in self._int_constants):
|
|
return self._int_constants[exprnode.name]
|
|
#
|
|
if (isinstance(exprnode, pycparser.c_ast.ID) and
|
|
exprnode.name == '__dotdotdotarray__'):
|
|
if partial_length_ok:
|
|
self._partial_length = True
|
|
return '...'
|
|
raise FFIError(":%d: unsupported '[...]' here, cannot derive "
|
|
"the actual array length in this context"
|
|
% exprnode.coord.line)
|
|
#
|
|
if isinstance(exprnode, pycparser.c_ast.BinaryOp):
|
|
left = self._parse_constant(exprnode.left)
|
|
right = self._parse_constant(exprnode.right)
|
|
if exprnode.op == '+':
|
|
return left + right
|
|
elif exprnode.op == '-':
|
|
return left - right
|
|
elif exprnode.op == '*':
|
|
return left * right
|
|
elif exprnode.op == '/':
|
|
return self._c_div(left, right)
|
|
elif exprnode.op == '%':
|
|
return left - self._c_div(left, right) * right
|
|
elif exprnode.op == '<<':
|
|
return left << right
|
|
elif exprnode.op == '>>':
|
|
return left >> right
|
|
elif exprnode.op == '&':
|
|
return left & right
|
|
elif exprnode.op == '|':
|
|
return left | right
|
|
elif exprnode.op == '^':
|
|
return left ^ right
|
|
#
|
|
raise FFIError(":%d: unsupported expression: expected a "
|
|
"simple numeric constant" % exprnode.coord.line)
|
|
|
|
def _c_div(self, a, b):
|
|
result = a // b
|
|
if ((a < 0) ^ (b < 0)) and (a % b) != 0:
|
|
result += 1
|
|
return result
|
|
|
|
def _build_enum_type(self, explicit_name, decls):
|
|
if decls is not None:
|
|
partial = False
|
|
enumerators = []
|
|
enumvalues = []
|
|
nextenumvalue = 0
|
|
for enum in decls.enumerators:
|
|
if _r_enum_dotdotdot.match(enum.name):
|
|
partial = True
|
|
continue
|
|
if enum.value is not None:
|
|
nextenumvalue = self._parse_constant(enum.value)
|
|
enumerators.append(enum.name)
|
|
enumvalues.append(nextenumvalue)
|
|
self._add_constants(enum.name, nextenumvalue)
|
|
nextenumvalue += 1
|
|
enumerators = tuple(enumerators)
|
|
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, quals) in other._declarations.items():
|
|
if name.startswith('anonymous $enum_$'):
|
|
continue # fix for test_anonymous_enum_include
|
|
kind = name.split(' ', 1)[0]
|
|
if kind in ('struct', 'union', 'enum', 'anonymous', 'typedef'):
|
|
self._declare(name, tp, included=True, quals=quals)
|
|
for k, v in other._int_constants.items():
|
|
self._add_constants(k, v)
|
|
|
|
def _get_unknown_type(self, decl):
|
|
typenames = decl.type.type.names
|
|
if typenames == ['__dotdotdot__']:
|
|
return model.unknown_type(decl.name)
|
|
|
|
if typenames == ['__dotdotdotint__']:
|
|
if self._uses_new_feature is None:
|
|
self._uses_new_feature = "'typedef int... %s'" % decl.name
|
|
return model.UnknownIntegerType(decl.name)
|
|
|
|
if typenames == ['__dotdotdotfloat__']:
|
|
# note: not for 'long double' so far
|
|
if self._uses_new_feature is None:
|
|
self._uses_new_feature = "'typedef float... %s'" % decl.name
|
|
return model.UnknownFloatType(decl.name)
|
|
|
|
raise FFIError(':%d: unsupported usage of "..." in typedef'
|
|
% decl.coord.line)
|
|
|
|
def _get_unknown_ptr_type(self, decl):
|
|
if decl.type.type.type.names == ['__dotdotdot__']:
|
|
return model.unknown_ptr_type(decl.name)
|
|
raise FFIError(':%d: unsupported usage of "..." in typedef'
|
|
% decl.coord.line)
|