/usr/lib/python2.7/dist-packages/pycparser/c_parser.py is in python-pycparser 2.10+dfsg-3.
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1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 | #------------------------------------------------------------------------------
# pycparser: c_parser.py
#
# CParser class: Parser and AST builder for the C language
#
# Copyright (C) 2008-2013, Eli Bendersky
# License: BSD
#------------------------------------------------------------------------------
import re
from ply import yacc
from . import c_ast
from .c_lexer import CLexer
from .plyparser import PLYParser, Coord, ParseError
from .ast_transforms import fix_switch_cases
class CParser(PLYParser):
def __init__(
self,
lex_optimize=True,
lextab='pycparser.lextab',
yacc_optimize=True,
yacctab='pycparser.yacctab',
yacc_debug=False):
""" Create a new CParser.
Some arguments for controlling the debug/optimization
level of the parser are provided. The defaults are
tuned for release/performance mode.
The simple rules for using them are:
*) When tweaking CParser/CLexer, set these to False
*) When releasing a stable parser, set to True
lex_optimize:
Set to False when you're modifying the lexer.
Otherwise, changes in the lexer won't be used, if
some lextab.py file exists.
When releasing with a stable lexer, set to True
to save the re-generation of the lexer table on
each run.
lextab:
Points to the lex table that's used for optimized
mode. Only if you're modifying the lexer and want
some tests to avoid re-generating the table, make
this point to a local lex table file (that's been
earlier generated with lex_optimize=True)
yacc_optimize:
Set to False when you're modifying the parser.
Otherwise, changes in the parser won't be used, if
some parsetab.py file exists.
When releasing with a stable parser, set to True
to save the re-generation of the parser table on
each run.
yacctab:
Points to the yacc table that's used for optimized
mode. Only if you're modifying the parser, make
this point to a local yacc table file
yacc_debug:
Generate a parser.out file that explains how yacc
built the parsing table from the grammar.
"""
self.clex = CLexer(
error_func=self._lex_error_func,
on_lbrace_func=self._lex_on_lbrace_func,
on_rbrace_func=self._lex_on_rbrace_func,
type_lookup_func=self._lex_type_lookup_func)
self.clex.build(
optimize=lex_optimize,
lextab=lextab)
self.tokens = self.clex.tokens
rules_with_opt = [
'abstract_declarator',
'assignment_expression',
'declaration_list',
'declaration_specifiers',
'designation',
'expression',
'identifier_list',
'init_declarator_list',
'parameter_type_list',
'specifier_qualifier_list',
'block_item_list',
'type_qualifier_list',
'struct_declarator_list'
]
for rule in rules_with_opt:
self._create_opt_rule(rule)
self.cparser = yacc.yacc(
module=self,
start='translation_unit_or_empty',
debug=yacc_debug,
optimize=yacc_optimize,
tabmodule=yacctab)
# Stack of scopes for keeping track of symbols. _scope_stack[-1] is
# the current (topmost) scope. Each scope is a dictionary that
# specifies whether a name is a type. If _scope_stack[n][name] is
# True, 'name' is currently a type in the scope. If it's False,
# 'name' is used in the scope but not as a type (for instance, if we
# saw: int name;
# If 'name' is not a key in _scope_stack[n] then 'name' was not defined
# in this scope at all.
self._scope_stack = [dict()]
# Keeps track of the last token given to yacc (the lookahead token)
self._last_yielded_token = None
def parse(self, text, filename='', debuglevel=0):
""" Parses C code and returns an AST.
text:
A string containing the C source code
filename:
Name of the file being parsed (for meaningful
error messages)
debuglevel:
Debug level to yacc
"""
self.clex.filename = filename
self.clex.reset_lineno()
self._scope_stack = [dict()]
self._last_yielded_token = None
return self.cparser.parse(
input=text,
lexer=self.clex,
debug=debuglevel)
######################-- PRIVATE --######################
def _push_scope(self):
self._scope_stack.append(dict())
def _pop_scope(self):
assert len(self._scope_stack) > 1
self._scope_stack.pop()
def _add_typedef_name(self, name, coord):
""" Add a new typedef name (ie a TYPEID) to the current scope
"""
if not self._scope_stack[-1].get(name, True):
self._parse_error(
"Typedef %r previously declared as non-typedef "
"in this scope" % name, coord)
self._scope_stack[-1][name] = True
def _add_identifier(self, name, coord):
""" Add a new object, function, or enum member name (ie an ID) to the
current scope
"""
if self._scope_stack[-1].get(name, False):
self._parse_error(
"Non-typedef %r previously declared as typedef "
"in this scope" % name, coord)
self._scope_stack[-1][name] = False
def _is_type_in_scope(self, name):
""" Is *name* a typedef-name in the current scope?
"""
for scope in reversed(self._scope_stack):
# If name is an identifier in this scope it shadows typedefs in
# higher scopes.
in_scope = scope.get(name)
if in_scope is not None: return in_scope
return False
def _lex_error_func(self, msg, line, column):
self._parse_error(msg, self._coord(line, column))
def _lex_on_lbrace_func(self):
self._push_scope()
def _lex_on_rbrace_func(self):
self._pop_scope()
def _lex_type_lookup_func(self, name):
""" Looks up types that were previously defined with
typedef.
Passed to the lexer for recognizing identifiers that
are types.
"""
is_type = self._is_type_in_scope(name)
return is_type
def _get_yacc_lookahead_token(self):
""" We need access to yacc's lookahead token in certain cases.
This is the last token yacc requested from the lexer, so we
ask the lexer.
"""
return self.clex.last_token
# To understand what's going on here, read sections A.8.5 and
# A.8.6 of K&R2 very carefully.
#
# A C type consists of a basic type declaration, with a list
# of modifiers. For example:
#
# int *c[5];
#
# The basic declaration here is 'int c', and the pointer and
# the array are the modifiers.
#
# Basic declarations are represented by TypeDecl (from module
# c_ast) and the modifiers are FuncDecl, PtrDecl and
# ArrayDecl.
#
# The standard states that whenever a new modifier is parsed,
# it should be added to the end of the list of modifiers. For
# example:
#
# K&R2 A.8.6.2: Array Declarators
#
# In a declaration T D where D has the form
# D1 [constant-expression-opt]
# and the type of the identifier in the declaration T D1 is
# "type-modifier T", the type of the
# identifier of D is "type-modifier array of T"
#
# This is what this method does. The declarator it receives
# can be a list of declarators ending with TypeDecl. It
# tacks the modifier to the end of this list, just before
# the TypeDecl.
#
# Additionally, the modifier may be a list itself. This is
# useful for pointers, that can come as a chain from the rule
# p_pointer. In this case, the whole modifier list is spliced
# into the new location.
#
def _type_modify_decl(self, decl, modifier):
""" Tacks a type modifier on a declarator, and returns
the modified declarator.
Note: the declarator and modifier may be modified
"""
#~ print '****'
#~ decl.show(offset=3)
#~ modifier.show(offset=3)
#~ print '****'
modifier_head = modifier
modifier_tail = modifier
# The modifier may be a nested list. Reach its tail.
#
while modifier_tail.type:
modifier_tail = modifier_tail.type
# If the decl is a basic type, just tack the modifier onto
# it
#
if isinstance(decl, c_ast.TypeDecl):
modifier_tail.type = decl
return modifier
else:
# Otherwise, the decl is a list of modifiers. Reach
# its tail and splice the modifier onto the tail,
# pointing to the underlying basic type.
#
decl_tail = decl
while not isinstance(decl_tail.type, c_ast.TypeDecl):
decl_tail = decl_tail.type
modifier_tail.type = decl_tail.type
decl_tail.type = modifier_head
return decl
# Due to the order in which declarators are constructed,
# they have to be fixed in order to look like a normal AST.
#
# When a declaration arrives from syntax construction, it has
# these problems:
# * The innermost TypeDecl has no type (because the basic
# type is only known at the uppermost declaration level)
# * The declaration has no variable name, since that is saved
# in the innermost TypeDecl
# * The typename of the declaration is a list of type
# specifiers, and not a node. Here, basic identifier types
# should be separated from more complex types like enums
# and structs.
#
# This method fixes these problems.
#
def _fix_decl_name_type(self, decl, typename):
""" Fixes a declaration. Modifies decl.
"""
# Reach the underlying basic type
#
type = decl
while not isinstance(type, c_ast.TypeDecl):
type = type.type
decl.name = type.declname
type.quals = decl.quals
# The typename is a list of types. If any type in this
# list isn't an IdentifierType, it must be the only
# type in the list (it's illegal to declare "int enum ..")
# If all the types are basic, they're collected in the
# IdentifierType holder.
#
for tn in typename:
if not isinstance(tn, c_ast.IdentifierType):
if len(typename) > 1:
self._parse_error(
"Invalid multiple types specified", tn.coord)
else:
type.type = tn
return decl
if not typename:
# Functions default to returning int
#
if not isinstance(decl.type, c_ast.FuncDecl):
self._parse_error(
"Missing type in declaration", decl.coord)
type.type = c_ast.IdentifierType(
['int'],
coord=decl.coord)
else:
# At this point, we know that typename is a list of IdentifierType
# nodes. Concatenate all the names into a single list.
#
type.type = c_ast.IdentifierType(
[name for id in typename for name in id.names],
coord=typename[0].coord)
return decl
def _add_declaration_specifier(self, declspec, newspec, kind):
""" Declaration specifiers are represented by a dictionary
with the entries:
* qual: a list of type qualifiers
* storage: a list of storage type qualifiers
* type: a list of type specifiers
* function: a list of function specifiers
This method is given a declaration specifier, and a
new specifier of a given kind.
Returns the declaration specifier, with the new
specifier incorporated.
"""
spec = declspec or dict(qual=[], storage=[], type=[], function=[])
spec[kind].insert(0, newspec)
return spec
def _build_declarations(self, spec, decls, typedef_namespace=False):
""" Builds a list of declarations all sharing the given specifiers.
If typedef_namespace is true, each declared name is added
to the "typedef namespace", which also includes objects,
functions, and enum constants.
"""
is_typedef = 'typedef' in spec['storage']
declarations = []
# Bit-fields are allowed to be unnamed.
#
if decls[0].get('bitsize') is not None:
pass
# When redeclaring typedef names as identifiers in inner scopes, a
# problem can occur where the identifier gets grouped into
# spec['type'], leaving decl as None. This can only occur for the
# first declarator.
#
elif decls[0]['decl'] is None:
if len(spec['type']) < 2 or len(spec['type'][-1].names) != 1 or \
not self._is_type_in_scope(spec['type'][-1].names[0]):
coord = '?'
for t in spec['type']:
if hasattr(t, 'coord'):
coord = t.coord
break
self._parse_error('Invalid declaration', coord)
# Make this look as if it came from "direct_declarator:ID"
decls[0]['decl'] = c_ast.TypeDecl(
declname=spec['type'][-1].names[0],
type=None,
quals=None,
coord=spec['type'][-1].coord)
# Remove the "new" type's name from the end of spec['type']
del spec['type'][-1]
# A similar problem can occur where the declaration ends up looking
# like an abstract declarator. Give it a name if this is the case.
#
elif not isinstance(decls[0]['decl'],
(c_ast.Struct, c_ast.Union, c_ast.IdentifierType)):
decls_0_tail = decls[0]['decl']
while not isinstance(decls_0_tail, c_ast.TypeDecl):
decls_0_tail = decls_0_tail.type
if decls_0_tail.declname is None:
decls_0_tail.declname = spec['type'][-1].names[0]
del spec['type'][-1]
for decl in decls:
assert decl['decl'] is not None
if is_typedef:
declaration = c_ast.Typedef(
name=None,
quals=spec['qual'],
storage=spec['storage'],
type=decl['decl'],
coord=decl['decl'].coord)
else:
declaration = c_ast.Decl(
name=None,
quals=spec['qual'],
storage=spec['storage'],
funcspec=spec['function'],
type=decl['decl'],
init=decl.get('init'),
bitsize=decl.get('bitsize'),
coord=decl['decl'].coord)
if isinstance(declaration.type,
(c_ast.Struct, c_ast.Union, c_ast.IdentifierType)):
fixed_decl = declaration
else:
fixed_decl = self._fix_decl_name_type(declaration, spec['type'])
# Add the type name defined by typedef to a
# symbol table (for usage in the lexer)
#
if typedef_namespace:
if is_typedef:
self._add_typedef_name(fixed_decl.name, fixed_decl.coord)
else:
self._add_identifier(fixed_decl.name, fixed_decl.coord)
declarations.append(fixed_decl)
return declarations
def _build_function_definition(self, spec, decl, param_decls, body):
""" Builds a function definition.
"""
assert 'typedef' not in spec['storage']
declaration = self._build_declarations(
spec=spec,
decls=[dict(decl=decl, init=None)],
typedef_namespace=True)[0]
return c_ast.FuncDef(
decl=declaration,
param_decls=param_decls,
body=body,
coord=decl.coord)
def _select_struct_union_class(self, token):
""" Given a token (either STRUCT or UNION), selects the
appropriate AST class.
"""
if token == 'struct':
return c_ast.Struct
else:
return c_ast.Union
##
## Precedence and associativity of operators
##
precedence = (
('left', 'LOR'),
('left', 'LAND'),
('left', 'OR'),
('left', 'XOR'),
('left', 'AND'),
('left', 'EQ', 'NE'),
('left', 'GT', 'GE', 'LT', 'LE'),
('left', 'RSHIFT', 'LSHIFT'),
('left', 'PLUS', 'MINUS'),
('left', 'TIMES', 'DIVIDE', 'MOD')
)
##
## Grammar productions
## Implementation of the BNF defined in K&R2 A.13
##
# Wrapper around a translation unit, to allow for empty input.
# Not strictly part of the C99 Grammar, but useful in practice.
#
def p_translation_unit_or_empty(self, p):
""" translation_unit_or_empty : translation_unit
| empty
"""
if p[1] is None:
p[0] = c_ast.FileAST([])
else:
p[0] = c_ast.FileAST(p[1])
def p_translation_unit_1(self, p):
""" translation_unit : external_declaration
"""
# Note: external_declaration is already a list
#
p[0] = p[1]
def p_translation_unit_2(self, p):
""" translation_unit : translation_unit external_declaration
"""
if p[2] is not None:
p[1].extend(p[2])
p[0] = p[1]
# Declarations always come as lists (because they can be
# several in one line), so we wrap the function definition
# into a list as well, to make the return value of
# external_declaration homogenous.
#
def p_external_declaration_1(self, p):
""" external_declaration : function_definition
"""
p[0] = [p[1]]
def p_external_declaration_2(self, p):
""" external_declaration : declaration
"""
p[0] = p[1]
def p_external_declaration_3(self, p):
""" external_declaration : pp_directive
"""
p[0] = p[1]
def p_external_declaration_4(self, p):
""" external_declaration : SEMI
"""
p[0] = None
def p_pp_directive(self, p):
""" pp_directive : PPHASH
"""
self._parse_error('Directives not supported yet',
self._coord(p.lineno(1)))
# In function definitions, the declarator can be followed by
# a declaration list, for old "K&R style" function definitios.
#
def p_function_definition_1(self, p):
""" function_definition : declarator declaration_list_opt compound_statement
"""
# no declaration specifiers - 'int' becomes the default type
spec = dict(
qual=[],
storage=[],
type=[c_ast.IdentifierType(['int'],
coord=self._coord(p.lineno(1)))],
function=[])
p[0] = self._build_function_definition(
spec=spec,
decl=p[1],
param_decls=p[2],
body=p[3])
def p_function_definition_2(self, p):
""" function_definition : declaration_specifiers declarator declaration_list_opt compound_statement
"""
spec = p[1]
p[0] = self._build_function_definition(
spec=spec,
decl=p[2],
param_decls=p[3],
body=p[4])
def p_statement(self, p):
""" statement : labeled_statement
| expression_statement
| compound_statement
| selection_statement
| iteration_statement
| jump_statement
"""
p[0] = p[1]
# In C, declarations can come several in a line:
# int x, *px, romulo = 5;
#
# However, for the AST, we will split them to separate Decl
# nodes.
#
# This rule splits its declarations and always returns a list
# of Decl nodes, even if it's one element long.
#
def p_decl_body(self, p):
""" decl_body : declaration_specifiers init_declarator_list_opt
"""
spec = p[1]
# p[2] (init_declarator_list_opt) is either a list or None
#
if p[2] is None:
# By the standard, you must have at least one declarator unless
# declaring a structure tag, a union tag, or the members of an
# enumeration.
#
ty = spec['type']
s_u_or_e = (c_ast.Struct, c_ast.Union, c_ast.Enum)
if len(ty) == 1 and isinstance(ty[0], s_u_or_e):
decls = [c_ast.Decl(
name=None,
quals=spec['qual'],
storage=spec['storage'],
funcspec=spec['function'],
type=ty[0],
init=None,
bitsize=None,
coord=ty[0].coord)]
# However, this case can also occur on redeclared identifiers in
# an inner scope. The trouble is that the redeclared type's name
# gets grouped into declaration_specifiers; _build_declarations
# compensates for this.
#
else:
decls = self._build_declarations(
spec=spec,
decls=[dict(decl=None, init=None)],
typedef_namespace=True)
else:
decls = self._build_declarations(
spec=spec,
decls=p[2],
typedef_namespace=True)
p[0] = decls
# The declaration has been split to a decl_body sub-rule and
# SEMI, because having them in a single rule created a problem
# for defining typedefs.
#
# If a typedef line was directly followed by a line using the
# type defined with the typedef, the type would not be
# recognized. This is because to reduce the declaration rule,
# the parser's lookahead asked for the token after SEMI, which
# was the type from the next line, and the lexer had no chance
# to see the updated type symbol table.
#
# Splitting solves this problem, because after seeing SEMI,
# the parser reduces decl_body, which actually adds the new
# type into the table to be seen by the lexer before the next
# line is reached.
def p_declaration(self, p):
""" declaration : decl_body SEMI
"""
p[0] = p[1]
# Since each declaration is a list of declarations, this
# rule will combine all the declarations and return a single
# list
#
def p_declaration_list(self, p):
""" declaration_list : declaration
| declaration_list declaration
"""
p[0] = p[1] if len(p) == 2 else p[1] + p[2]
def p_declaration_specifiers_1(self, p):
""" declaration_specifiers : type_qualifier declaration_specifiers_opt
"""
p[0] = self._add_declaration_specifier(p[2], p[1], 'qual')
def p_declaration_specifiers_2(self, p):
""" declaration_specifiers : type_specifier declaration_specifiers_opt
"""
p[0] = self._add_declaration_specifier(p[2], p[1], 'type')
def p_declaration_specifiers_3(self, p):
""" declaration_specifiers : storage_class_specifier declaration_specifiers_opt
"""
p[0] = self._add_declaration_specifier(p[2], p[1], 'storage')
def p_declaration_specifiers_4(self, p):
""" declaration_specifiers : function_specifier declaration_specifiers_opt
"""
p[0] = self._add_declaration_specifier(p[2], p[1], 'function')
def p_storage_class_specifier(self, p):
""" storage_class_specifier : AUTO
| REGISTER
| STATIC
| EXTERN
| TYPEDEF
"""
p[0] = p[1]
def p_function_specifier(self, p):
""" function_specifier : INLINE
"""
p[0] = p[1]
def p_type_specifier_1(self, p):
""" type_specifier : VOID
| _BOOL
| CHAR
| SHORT
| INT
| LONG
| FLOAT
| DOUBLE
| _COMPLEX
| SIGNED
| UNSIGNED
"""
p[0] = c_ast.IdentifierType([p[1]], coord=self._coord(p.lineno(1)))
def p_type_specifier_2(self, p):
""" type_specifier : typedef_name
| enum_specifier
| struct_or_union_specifier
"""
p[0] = p[1]
def p_type_qualifier(self, p):
""" type_qualifier : CONST
| RESTRICT
| VOLATILE
"""
p[0] = p[1]
def p_init_declarator_list_1(self, p):
""" init_declarator_list : init_declarator
| init_declarator_list COMMA init_declarator
"""
p[0] = p[1] + [p[3]] if len(p) == 4 else [p[1]]
# If the code is declaring a variable that was declared a typedef in an
# outer scope, yacc will think the name is part of declaration_specifiers,
# not init_declarator, and will then get confused by EQUALS. Pass None
# up in place of declarator, and handle this at a higher level.
#
def p_init_declarator_list_2(self, p):
""" init_declarator_list : EQUALS initializer
"""
p[0] = [dict(decl=None, init=p[2])]
# Similarly, if the code contains duplicate typedefs of, for example,
# array types, the array portion will appear as an abstract declarator.
#
def p_init_declarator_list_3(self, p):
""" init_declarator_list : abstract_declarator
"""
p[0] = [dict(decl=p[1], init=None)]
# Returns a {decl=<declarator> : init=<initializer>} dictionary
# If there's no initializer, uses None
#
def p_init_declarator(self, p):
""" init_declarator : declarator
| declarator EQUALS initializer
"""
p[0] = dict(decl=p[1], init=(p[3] if len(p) > 2 else None))
def p_specifier_qualifier_list_1(self, p):
""" specifier_qualifier_list : type_qualifier specifier_qualifier_list_opt
"""
p[0] = self._add_declaration_specifier(p[2], p[1], 'qual')
def p_specifier_qualifier_list_2(self, p):
""" specifier_qualifier_list : type_specifier specifier_qualifier_list_opt
"""
p[0] = self._add_declaration_specifier(p[2], p[1], 'type')
# TYPEID is allowed here (and in other struct/enum related tag names), because
# struct/enum tags reside in their own namespace and can be named the same as types
#
def p_struct_or_union_specifier_1(self, p):
""" struct_or_union_specifier : struct_or_union ID
| struct_or_union TYPEID
"""
klass = self._select_struct_union_class(p[1])
p[0] = klass(
name=p[2],
decls=None,
coord=self._coord(p.lineno(2)))
def p_struct_or_union_specifier_2(self, p):
""" struct_or_union_specifier : struct_or_union brace_open struct_declaration_list brace_close
"""
klass = self._select_struct_union_class(p[1])
p[0] = klass(
name=None,
decls=p[3],
coord=self._coord(p.lineno(2)))
def p_struct_or_union_specifier_3(self, p):
""" struct_or_union_specifier : struct_or_union ID brace_open struct_declaration_list brace_close
| struct_or_union TYPEID brace_open struct_declaration_list brace_close
"""
klass = self._select_struct_union_class(p[1])
p[0] = klass(
name=p[2],
decls=p[4],
coord=self._coord(p.lineno(2)))
def p_struct_or_union(self, p):
""" struct_or_union : STRUCT
| UNION
"""
p[0] = p[1]
# Combine all declarations into a single list
#
def p_struct_declaration_list(self, p):
""" struct_declaration_list : struct_declaration
| struct_declaration_list struct_declaration
"""
p[0] = p[1] if len(p) == 2 else p[1] + p[2]
def p_struct_declaration_1(self, p):
""" struct_declaration : specifier_qualifier_list struct_declarator_list_opt SEMI
"""
spec = p[1]
assert 'typedef' not in spec['storage']
if p[2] is not None:
decls = self._build_declarations(
spec=spec,
decls=p[2])
elif len(spec['type']) == 1:
# Anonymous struct/union, gcc extension, C1x feature.
# Although the standard only allows structs/unions here, I see no
# reason to disallow other types since some compilers have typedefs
# here, and pycparser isn't about rejecting all invalid code.
#
node = spec['type'][0]
if isinstance(node, c_ast.Node):
decl_type = node
else:
decl_type = c_ast.IdentifierType(node)
decls = self._build_declarations(
spec=spec,
decls=[dict(decl=decl_type)])
else:
# Structure/union members can have the same names as typedefs.
# The trouble is that the member's name gets grouped into
# specifier_qualifier_list; _build_declarations compensates.
#
decls = self._build_declarations(
spec=spec,
decls=[dict(decl=None, init=None)])
p[0] = decls
def p_struct_declaration_2(self, p):
""" struct_declaration : specifier_qualifier_list abstract_declarator SEMI
"""
# "Abstract declarator?!", you ask? Structure members can have the
# same names as typedefs. The trouble is that the member's name gets
# grouped into specifier_qualifier_list, leaving any remainder to
# appear as an abstract declarator, as in:
# typedef int Foo;
# struct { Foo Foo[3]; };
#
p[0] = self._build_declarations(
spec=p[1],
decls=[dict(decl=p[2], init=None)])
def p_struct_declarator_list(self, p):
""" struct_declarator_list : struct_declarator
| struct_declarator_list COMMA struct_declarator
"""
p[0] = p[1] + [p[3]] if len(p) == 4 else [p[1]]
# struct_declarator passes up a dict with the keys: decl (for
# the underlying declarator) and bitsize (for the bitsize)
#
def p_struct_declarator_1(self, p):
""" struct_declarator : declarator
"""
p[0] = {'decl': p[1], 'bitsize': None}
def p_struct_declarator_2(self, p):
""" struct_declarator : declarator COLON constant_expression
| COLON constant_expression
"""
if len(p) > 3:
p[0] = {'decl': p[1], 'bitsize': p[3]}
else:
p[0] = {'decl': c_ast.TypeDecl(None, None, None), 'bitsize': p[2]}
def p_enum_specifier_1(self, p):
""" enum_specifier : ENUM ID
| ENUM TYPEID
"""
p[0] = c_ast.Enum(p[2], None, self._coord(p.lineno(1)))
def p_enum_specifier_2(self, p):
""" enum_specifier : ENUM brace_open enumerator_list brace_close
"""
p[0] = c_ast.Enum(None, p[3], self._coord(p.lineno(1)))
def p_enum_specifier_3(self, p):
""" enum_specifier : ENUM ID brace_open enumerator_list brace_close
| ENUM TYPEID brace_open enumerator_list brace_close
"""
p[0] = c_ast.Enum(p[2], p[4], self._coord(p.lineno(1)))
def p_enumerator_list(self, p):
""" enumerator_list : enumerator
| enumerator_list COMMA
| enumerator_list COMMA enumerator
"""
if len(p) == 2:
p[0] = c_ast.EnumeratorList([p[1]], p[1].coord)
elif len(p) == 3:
p[0] = p[1]
else:
p[1].enumerators.append(p[3])
p[0] = p[1]
def p_enumerator(self, p):
""" enumerator : ID
| ID EQUALS constant_expression
"""
if len(p) == 2:
enumerator = c_ast.Enumerator(
p[1], None,
self._coord(p.lineno(1)))
else:
enumerator = c_ast.Enumerator(
p[1], p[3],
self._coord(p.lineno(1)))
self._add_identifier(enumerator.name, enumerator.coord)
p[0] = enumerator
def p_declarator_1(self, p):
""" declarator : direct_declarator
"""
p[0] = p[1]
def p_declarator_2(self, p):
""" declarator : pointer direct_declarator
"""
p[0] = self._type_modify_decl(p[2], p[1])
# Since it's impossible for a type to be specified after a pointer, assume
# it's intended to be the name for this declaration. _add_identifier will
# raise an error if this TYPEID can't be redeclared.
#
def p_declarator_3(self, p):
""" declarator : pointer TYPEID
"""
decl = c_ast.TypeDecl(
declname=p[2],
type=None,
quals=None,
coord=self._coord(p.lineno(2)))
p[0] = self._type_modify_decl(decl, p[1])
def p_direct_declarator_1(self, p):
""" direct_declarator : ID
"""
p[0] = c_ast.TypeDecl(
declname=p[1],
type=None,
quals=None,
coord=self._coord(p.lineno(1)))
def p_direct_declarator_2(self, p):
""" direct_declarator : LPAREN declarator RPAREN
"""
p[0] = p[2]
def p_direct_declarator_3(self, p):
""" direct_declarator : direct_declarator LBRACKET assignment_expression_opt RBRACKET
"""
arr = c_ast.ArrayDecl(
type=None,
dim=p[3],
coord=p[1].coord)
p[0] = self._type_modify_decl(decl=p[1], modifier=arr)
# Special for VLAs
#
def p_direct_declarator_4(self, p):
""" direct_declarator : direct_declarator LBRACKET TIMES RBRACKET
"""
arr = c_ast.ArrayDecl(
type=None,
dim=c_ast.ID(p[3], self._coord(p.lineno(3))),
coord=p[1].coord)
p[0] = self._type_modify_decl(decl=p[1], modifier=arr)
def p_direct_declarator_5(self, p):
""" direct_declarator : direct_declarator LPAREN parameter_type_list RPAREN
| direct_declarator LPAREN identifier_list_opt RPAREN
"""
func = c_ast.FuncDecl(
args=p[3],
type=None,
coord=p[1].coord)
# To see why _get_yacc_lookahead_token is needed, consider:
# typedef char TT;
# void foo(int TT) { TT = 10; }
# Outside the function, TT is a typedef, but inside (starting and
# ending with the braces) it's a parameter. The trouble begins with
# yacc's lookahead token. We don't know if we're declaring or
# defining a function until we see LBRACE, but if we wait for yacc to
# trigger a rule on that token, then TT will have already been read
# and incorrectly interpreted as TYPEID. We need to add the
# parameters to the scope the moment the lexer sees LBRACE.
#
if self._get_yacc_lookahead_token().type == "LBRACE":
if func.args is not None:
for param in func.args.params:
if isinstance(param, c_ast.EllipsisParam): break
self._add_identifier(param.name, param.coord)
p[0] = self._type_modify_decl(decl=p[1], modifier=func)
def p_pointer(self, p):
""" pointer : TIMES type_qualifier_list_opt
| TIMES type_qualifier_list_opt pointer
"""
coord = self._coord(p.lineno(1))
p[0] = c_ast.PtrDecl(
quals=p[2] or [],
type=p[3] if len(p) > 3 else None,
coord=coord)
def p_type_qualifier_list(self, p):
""" type_qualifier_list : type_qualifier
| type_qualifier_list type_qualifier
"""
p[0] = [p[1]] if len(p) == 2 else p[1] + [p[2]]
def p_parameter_type_list(self, p):
""" parameter_type_list : parameter_list
| parameter_list COMMA ELLIPSIS
"""
if len(p) > 2:
p[1].params.append(c_ast.EllipsisParam(self._coord(p.lineno(3))))
p[0] = p[1]
def p_parameter_list(self, p):
""" parameter_list : parameter_declaration
| parameter_list COMMA parameter_declaration
"""
if len(p) == 2: # single parameter
p[0] = c_ast.ParamList([p[1]], p[1].coord)
else:
p[1].params.append(p[3])
p[0] = p[1]
def p_parameter_declaration_1(self, p):
""" parameter_declaration : declaration_specifiers declarator
"""
spec = p[1]
if not spec['type']:
spec['type'] = [c_ast.IdentifierType(['int'],
coord=self._coord(p.lineno(1)))]
p[0] = self._build_declarations(
spec=spec,
decls=[dict(decl=p[2])])[0]
def p_parameter_declaration_2(self, p):
""" parameter_declaration : declaration_specifiers abstract_declarator_opt
"""
spec = p[1]
if not spec['type']:
spec['type'] = [c_ast.IdentifierType(['int'],
coord=self._coord(p.lineno(1)))]
# Parameters can have the same names as typedefs. The trouble is that
# the parameter's name gets grouped into declaration_specifiers, making
# it look like an old-style declaration; compensate.
#
if len(spec['type']) > 1 and len(spec['type'][-1].names) == 1 and \
self._is_type_in_scope(spec['type'][-1].names[0]):
decl = self._build_declarations(
spec=spec,
decls=[dict(decl=p[2], init=None)])[0]
# This truly is an old-style parameter declaration
#
else:
decl = c_ast.Typename(
quals=spec['qual'],
type=p[2] or c_ast.TypeDecl(None, None, None),
coord=self._coord(p.lineno(2)))
typename = spec['type']
decl = self._fix_decl_name_type(decl, typename)
p[0] = decl
def p_identifier_list(self, p):
""" identifier_list : identifier
| identifier_list COMMA identifier
"""
if len(p) == 2: # single parameter
p[0] = c_ast.ParamList([p[1]], p[1].coord)
else:
p[1].params.append(p[3])
p[0] = p[1]
def p_initializer_1(self, p):
""" initializer : assignment_expression
"""
p[0] = p[1]
def p_initializer_2(self, p):
""" initializer : brace_open initializer_list brace_close
| brace_open initializer_list COMMA brace_close
"""
p[0] = p[2]
def p_initializer_list(self, p):
""" initializer_list : designation_opt initializer
| initializer_list COMMA designation_opt initializer
"""
if len(p) == 3: # single initializer
init = p[2] if p[1] is None else c_ast.NamedInitializer(p[1], p[2])
p[0] = c_ast.InitList([init], p[2].coord)
else:
init = p[4] if p[3] is None else c_ast.NamedInitializer(p[3], p[4])
p[1].exprs.append(init)
p[0] = p[1]
def p_designation(self, p):
""" designation : designator_list EQUALS
"""
p[0] = p[1]
# Designators are represented as a list of nodes, in the order in which
# they're written in the code.
#
def p_designator_list(self, p):
""" designator_list : designator
| designator_list designator
"""
p[0] = [p[1]] if len(p) == 2 else p[1] + [p[2]]
def p_designator(self, p):
""" designator : LBRACKET constant_expression RBRACKET
| PERIOD identifier
"""
p[0] = p[2]
def p_type_name(self, p):
""" type_name : specifier_qualifier_list abstract_declarator_opt
"""
#~ print '=========='
#~ print p[1]
#~ print p[2]
#~ print p[2].children()
#~ print '=========='
typename = c_ast.Typename(
quals=p[1]['qual'],
type=p[2] or c_ast.TypeDecl(None, None, None),
coord=self._coord(p.lineno(2)))
p[0] = self._fix_decl_name_type(typename, p[1]['type'])
def p_abstract_declarator_1(self, p):
""" abstract_declarator : pointer
"""
dummytype = c_ast.TypeDecl(None, None, None)
p[0] = self._type_modify_decl(
decl=dummytype,
modifier=p[1])
def p_abstract_declarator_2(self, p):
""" abstract_declarator : pointer direct_abstract_declarator
"""
p[0] = self._type_modify_decl(p[2], p[1])
def p_abstract_declarator_3(self, p):
""" abstract_declarator : direct_abstract_declarator
"""
p[0] = p[1]
# Creating and using direct_abstract_declarator_opt here
# instead of listing both direct_abstract_declarator and the
# lack of it in the beginning of _1 and _2 caused two
# shift/reduce errors.
#
def p_direct_abstract_declarator_1(self, p):
""" direct_abstract_declarator : LPAREN abstract_declarator RPAREN """
p[0] = p[2]
def p_direct_abstract_declarator_2(self, p):
""" direct_abstract_declarator : direct_abstract_declarator LBRACKET assignment_expression_opt RBRACKET
"""
arr = c_ast.ArrayDecl(
type=None,
dim=p[3],
coord=p[1].coord)
p[0] = self._type_modify_decl(decl=p[1], modifier=arr)
def p_direct_abstract_declarator_3(self, p):
""" direct_abstract_declarator : LBRACKET assignment_expression_opt RBRACKET
"""
p[0] = c_ast.ArrayDecl(
type=c_ast.TypeDecl(None, None, None),
dim=p[2],
coord=self._coord(p.lineno(1)))
def p_direct_abstract_declarator_4(self, p):
""" direct_abstract_declarator : direct_abstract_declarator LBRACKET TIMES RBRACKET
"""
arr = c_ast.ArrayDecl(
type=None,
dim=c_ast.ID(p[3], self._coord(p.lineno(3))),
coord=p[1].coord)
p[0] = self._type_modify_decl(decl=p[1], modifier=arr)
def p_direct_abstract_declarator_5(self, p):
""" direct_abstract_declarator : LBRACKET TIMES RBRACKET
"""
p[0] = c_ast.ArrayDecl(
type=c_ast.TypeDecl(None, None, None),
dim=c_ast.ID(p[3], self._coord(p.lineno(3))),
coord=self._coord(p.lineno(1)))
def p_direct_abstract_declarator_6(self, p):
""" direct_abstract_declarator : direct_abstract_declarator LPAREN parameter_type_list_opt RPAREN
"""
func = c_ast.FuncDecl(
args=p[3],
type=None,
coord=p[1].coord)
p[0] = self._type_modify_decl(decl=p[1], modifier=func)
def p_direct_abstract_declarator_7(self, p):
""" direct_abstract_declarator : LPAREN parameter_type_list_opt RPAREN
"""
p[0] = c_ast.FuncDecl(
args=p[2],
type=c_ast.TypeDecl(None, None, None),
coord=self._coord(p.lineno(1)))
# declaration is a list, statement isn't. To make it consistent, block_item
# will always be a list
#
def p_block_item(self, p):
""" block_item : declaration
| statement
"""
p[0] = p[1] if isinstance(p[1], list) else [p[1]]
# Since we made block_item a list, this just combines lists
#
def p_block_item_list(self, p):
""" block_item_list : block_item
| block_item_list block_item
"""
# Empty block items (plain ';') produce [None], so ignore them
p[0] = p[1] if (len(p) == 2 or p[2] == [None]) else p[1] + p[2]
def p_compound_statement_1(self, p):
""" compound_statement : brace_open block_item_list_opt brace_close """
p[0] = c_ast.Compound(
block_items=p[2],
coord=self._coord(p.lineno(1)))
def p_labeled_statement_1(self, p):
""" labeled_statement : ID COLON statement """
p[0] = c_ast.Label(p[1], p[3], self._coord(p.lineno(1)))
def p_labeled_statement_2(self, p):
""" labeled_statement : CASE constant_expression COLON statement """
p[0] = c_ast.Case(p[2], [p[4]], self._coord(p.lineno(1)))
def p_labeled_statement_3(self, p):
""" labeled_statement : DEFAULT COLON statement """
p[0] = c_ast.Default([p[3]], self._coord(p.lineno(1)))
def p_selection_statement_1(self, p):
""" selection_statement : IF LPAREN expression RPAREN statement """
p[0] = c_ast.If(p[3], p[5], None, self._coord(p.lineno(1)))
def p_selection_statement_2(self, p):
""" selection_statement : IF LPAREN expression RPAREN statement ELSE statement """
p[0] = c_ast.If(p[3], p[5], p[7], self._coord(p.lineno(1)))
def p_selection_statement_3(self, p):
""" selection_statement : SWITCH LPAREN expression RPAREN statement """
p[0] = fix_switch_cases(
c_ast.Switch(p[3], p[5], self._coord(p.lineno(1))))
def p_iteration_statement_1(self, p):
""" iteration_statement : WHILE LPAREN expression RPAREN statement """
p[0] = c_ast.While(p[3], p[5], self._coord(p.lineno(1)))
def p_iteration_statement_2(self, p):
""" iteration_statement : DO statement WHILE LPAREN expression RPAREN SEMI """
p[0] = c_ast.DoWhile(p[5], p[2], self._coord(p.lineno(1)))
def p_iteration_statement_3(self, p):
""" iteration_statement : FOR LPAREN expression_opt SEMI expression_opt SEMI expression_opt RPAREN statement """
p[0] = c_ast.For(p[3], p[5], p[7], p[9], self._coord(p.lineno(1)))
def p_iteration_statement_4(self, p):
""" iteration_statement : FOR LPAREN declaration expression_opt SEMI expression_opt RPAREN statement """
p[0] = c_ast.For(c_ast.DeclList(p[3]), p[4], p[6], p[8], self._coord(p.lineno(1)))
def p_jump_statement_1(self, p):
""" jump_statement : GOTO ID SEMI """
p[0] = c_ast.Goto(p[2], self._coord(p.lineno(1)))
def p_jump_statement_2(self, p):
""" jump_statement : BREAK SEMI """
p[0] = c_ast.Break(self._coord(p.lineno(1)))
def p_jump_statement_3(self, p):
""" jump_statement : CONTINUE SEMI """
p[0] = c_ast.Continue(self._coord(p.lineno(1)))
def p_jump_statement_4(self, p):
""" jump_statement : RETURN expression SEMI
| RETURN SEMI
"""
p[0] = c_ast.Return(p[2] if len(p) == 4 else None, self._coord(p.lineno(1)))
def p_expression_statement(self, p):
""" expression_statement : expression_opt SEMI """
if p[1] is None:
p[0] = c_ast.EmptyStatement(self._coord(p.lineno(1)))
else:
p[0] = p[1]
def p_expression(self, p):
""" expression : assignment_expression
| expression COMMA assignment_expression
"""
if len(p) == 2:
p[0] = p[1]
else:
if not isinstance(p[1], c_ast.ExprList):
p[1] = c_ast.ExprList([p[1]], p[1].coord)
p[1].exprs.append(p[3])
p[0] = p[1]
def p_typedef_name(self, p):
""" typedef_name : TYPEID """
p[0] = c_ast.IdentifierType([p[1]], coord=self._coord(p.lineno(1)))
def p_assignment_expression(self, p):
""" assignment_expression : conditional_expression
| unary_expression assignment_operator assignment_expression
"""
if len(p) == 2:
p[0] = p[1]
else:
p[0] = c_ast.Assignment(p[2], p[1], p[3], p[1].coord)
# K&R2 defines these as many separate rules, to encode
# precedence and associativity. Why work hard ? I'll just use
# the built in precedence/associativity specification feature
# of PLY. (see precedence declaration above)
#
def p_assignment_operator(self, p):
""" assignment_operator : EQUALS
| XOREQUAL
| TIMESEQUAL
| DIVEQUAL
| MODEQUAL
| PLUSEQUAL
| MINUSEQUAL
| LSHIFTEQUAL
| RSHIFTEQUAL
| ANDEQUAL
| OREQUAL
"""
p[0] = p[1]
def p_constant_expression(self, p):
""" constant_expression : conditional_expression """
p[0] = p[1]
def p_conditional_expression(self, p):
""" conditional_expression : binary_expression
| binary_expression CONDOP expression COLON conditional_expression
"""
if len(p) == 2:
p[0] = p[1]
else:
p[0] = c_ast.TernaryOp(p[1], p[3], p[5], p[1].coord)
def p_binary_expression(self, p):
""" binary_expression : cast_expression
| binary_expression TIMES binary_expression
| binary_expression DIVIDE binary_expression
| binary_expression MOD binary_expression
| binary_expression PLUS binary_expression
| binary_expression MINUS binary_expression
| binary_expression RSHIFT binary_expression
| binary_expression LSHIFT binary_expression
| binary_expression LT binary_expression
| binary_expression LE binary_expression
| binary_expression GE binary_expression
| binary_expression GT binary_expression
| binary_expression EQ binary_expression
| binary_expression NE binary_expression
| binary_expression AND binary_expression
| binary_expression OR binary_expression
| binary_expression XOR binary_expression
| binary_expression LAND binary_expression
| binary_expression LOR binary_expression
"""
if len(p) == 2:
p[0] = p[1]
else:
p[0] = c_ast.BinaryOp(p[2], p[1], p[3], p[1].coord)
def p_cast_expression_1(self, p):
""" cast_expression : unary_expression """
p[0] = p[1]
def p_cast_expression_2(self, p):
""" cast_expression : LPAREN type_name RPAREN cast_expression """
p[0] = c_ast.Cast(p[2], p[4], self._coord(p.lineno(1)))
def p_unary_expression_1(self, p):
""" unary_expression : postfix_expression """
p[0] = p[1]
def p_unary_expression_2(self, p):
""" unary_expression : PLUSPLUS unary_expression
| MINUSMINUS unary_expression
| unary_operator cast_expression
"""
p[0] = c_ast.UnaryOp(p[1], p[2], p[2].coord)
def p_unary_expression_3(self, p):
""" unary_expression : SIZEOF unary_expression
| SIZEOF LPAREN type_name RPAREN
"""
p[0] = c_ast.UnaryOp(
p[1],
p[2] if len(p) == 3 else p[3],
self._coord(p.lineno(1)))
def p_unary_operator(self, p):
""" unary_operator : AND
| TIMES
| PLUS
| MINUS
| NOT
| LNOT
"""
p[0] = p[1]
def p_postfix_expression_1(self, p):
""" postfix_expression : primary_expression """
p[0] = p[1]
def p_postfix_expression_2(self, p):
""" postfix_expression : postfix_expression LBRACKET expression RBRACKET """
p[0] = c_ast.ArrayRef(p[1], p[3], p[1].coord)
def p_postfix_expression_3(self, p):
""" postfix_expression : postfix_expression LPAREN argument_expression_list RPAREN
| postfix_expression LPAREN RPAREN
"""
p[0] = c_ast.FuncCall(p[1], p[3] if len(p) == 5 else None, p[1].coord)
def p_postfix_expression_4(self, p):
""" postfix_expression : postfix_expression PERIOD ID
| postfix_expression PERIOD TYPEID
| postfix_expression ARROW ID
| postfix_expression ARROW TYPEID
"""
field = c_ast.ID(p[3], self._coord(p.lineno(3)))
p[0] = c_ast.StructRef(p[1], p[2], field, p[1].coord)
def p_postfix_expression_5(self, p):
""" postfix_expression : postfix_expression PLUSPLUS
| postfix_expression MINUSMINUS
"""
p[0] = c_ast.UnaryOp('p' + p[2], p[1], p[1].coord)
def p_postfix_expression_6(self, p):
""" postfix_expression : LPAREN type_name RPAREN brace_open initializer_list brace_close
| LPAREN type_name RPAREN brace_open initializer_list COMMA brace_close
"""
p[0] = c_ast.CompoundLiteral(p[2], p[5])
def p_primary_expression_1(self, p):
""" primary_expression : identifier """
p[0] = p[1]
def p_primary_expression_2(self, p):
""" primary_expression : constant """
p[0] = p[1]
def p_primary_expression_3(self, p):
""" primary_expression : unified_string_literal
| unified_wstring_literal
"""
p[0] = p[1]
def p_primary_expression_4(self, p):
""" primary_expression : LPAREN expression RPAREN """
p[0] = p[2]
def p_argument_expression_list(self, p):
""" argument_expression_list : assignment_expression
| argument_expression_list COMMA assignment_expression
"""
if len(p) == 2: # single expr
p[0] = c_ast.ExprList([p[1]], p[1].coord)
else:
p[1].exprs.append(p[3])
p[0] = p[1]
def p_identifier(self, p):
""" identifier : ID """
p[0] = c_ast.ID(p[1], self._coord(p.lineno(1)))
def p_constant_1(self, p):
""" constant : INT_CONST_DEC
| INT_CONST_OCT
| INT_CONST_HEX
"""
p[0] = c_ast.Constant(
'int', p[1], self._coord(p.lineno(1)))
def p_constant_2(self, p):
""" constant : FLOAT_CONST
| HEX_FLOAT_CONST
"""
p[0] = c_ast.Constant(
'float', p[1], self._coord(p.lineno(1)))
def p_constant_3(self, p):
""" constant : CHAR_CONST
| WCHAR_CONST
"""
p[0] = c_ast.Constant(
'char', p[1], self._coord(p.lineno(1)))
# The "unified" string and wstring literal rules are for supporting
# concatenation of adjacent string literals.
# I.e. "hello " "world" is seen by the C compiler as a single string literal
# with the value "hello world"
#
def p_unified_string_literal(self, p):
""" unified_string_literal : STRING_LITERAL
| unified_string_literal STRING_LITERAL
"""
if len(p) == 2: # single literal
p[0] = c_ast.Constant(
'string', p[1], self._coord(p.lineno(1)))
else:
p[1].value = p[1].value[:-1] + p[2][1:]
p[0] = p[1]
def p_unified_wstring_literal(self, p):
""" unified_wstring_literal : WSTRING_LITERAL
| unified_wstring_literal WSTRING_LITERAL
"""
if len(p) == 2: # single literal
p[0] = c_ast.Constant(
'string', p[1], self._coord(p.lineno(1)))
else:
p[1].value = p[1].value.rstrip[:-1] + p[2][1:]
p[0] = p[1]
def p_brace_open(self, p):
""" brace_open : LBRACE
"""
p[0] = p[1]
def p_brace_close(self, p):
""" brace_close : RBRACE
"""
p[0] = p[1]
def p_empty(self, p):
'empty : '
p[0] = None
def p_error(self, p):
# If error recovery is added here in the future, make sure
# _get_yacc_lookahead_token still works!
#
if p:
self._parse_error(
'before: %s' % p.value,
self._coord(lineno=p.lineno,
column=self.clex.find_tok_column(p)))
else:
self._parse_error('At end of input', '')
#------------------------------------------------------------------------------
if __name__ == "__main__":
import pprint
import time, sys
#t1 = time.time()
#parser = CParser(lex_optimize=True, yacc_debug=True, yacc_optimize=False)
#sys.write(time.time() - t1)
#buf = '''
#int (*k)(int);
#'''
## set debuglevel to 2 for debugging
#t = parser.parse(buf, 'x.c', debuglevel=0)
#t.show(showcoord=True)
|