1 /* Declarations for the parser for C and Objective-C.
2 Copyright (C) 1987-2023 Free Software Foundation, Inc.
4 Parser actions based on the old Bison parser; structure somewhat
5 influenced by and fragments based on the C++ parser.
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
23 #ifndef GCC_C_PARSER_H
24 #define GCC_C_PARSER_H
26 /* The C lexer intermediates between the lexer in cpplib and c-lex.cc
27 and the C parser. Unlike the C++ lexer, the parser structure
28 stores the lexer information instead of using a separate structure.
29 Identifiers are separated into ordinary identifiers, type names,
30 keywords and some other Objective-C types of identifiers, and some
31 look-ahead is maintained.
33 ??? It might be a good idea to lex the whole file up front (as for
34 C++). It would then be possible to share more of the C and C++
35 lexer code, if desired. */
37 /* More information about the type of a CPP_NAME token. */
39 /* An ordinary identifier. */
41 /* An identifier declared as a typedef name. */
43 /* An identifier declared as an Objective-C class name. */
45 /* An address space identifier. */
47 /* Not an identifier. */
51 /* A single C token after string literal concatenation and conversion
52 of preprocessing tokens to tokens. */
53 struct GTY (()) c_token
{
54 /* The kind of token. */
55 ENUM_BITFIELD (cpp_ttype
) type
: 8;
56 /* If this token is a CPP_NAME, this value indicates whether also
57 declared as some kind of type. Otherwise, it is C_ID_NONE. */
58 ENUM_BITFIELD (c_id_kind
) id_kind
: 8;
59 /* If this token is a keyword, this value indicates which keyword.
60 Otherwise, this value is RID_MAX. */
61 ENUM_BITFIELD (rid
) keyword
: 8;
62 /* If this token is a CPP_PRAGMA, this indicates the pragma that
63 was seen. Otherwise it is PRAGMA_NONE. */
64 ENUM_BITFIELD (pragma_kind
) pragma_kind
: 8;
65 /* The location at which this token was found. */
67 /* The value associated with this token, if any. */
72 source_range
get_range () const
74 return get_range_from_loc (line_table
, location
);
77 location_t
get_finish () const
79 return get_range ().m_finish
;
83 /* This should have the same layout as c_tree_token_vec
84 in c-decl.cc, but for GTY reasons with ObjC can't be
86 struct c_tree_token_vec_struct
{
87 struct tree_base base
;
88 vec
<c_token
, va_gc
> *tokens
;
91 #define C_TOKEN_VEC_TOKENS(NODE) \
92 (((struct c_tree_token_vec_struct *) TREE_CHECK (NODE, C_TOKEN_VEC))->tokens)
97 /* Possibly kinds of declarator to parse. */
99 /* A normal declarator with an identifier. */
101 /* An abstract declarator (maybe empty). */
103 /* A parameter declarator: may be either, but after a type name does
104 not redeclare a typedef name as an identifier if it can
105 alternatively be interpreted as a typedef name; see DR#009,
106 applied in C90 TC1, omitted from C99 and reapplied in C99 TC2
107 following DR#249. For example, given a typedef T, "int T" and
108 "int *T" are valid parameter declarations redeclaring T, while
109 "int (T)" and "int * (T)" and "int (T[])" and "int (T (int))" are
110 abstract declarators rather than involving redundant parentheses;
111 the same applies with attributes inside the parentheses before
116 /* The binary operation precedence levels, where 0 is a dummy lowest level
117 used for the bottom of the stack. */
133 enum c_lookahead_kind
{
134 /* Always treat unknown identifiers as typenames. */
137 /* Could be parsing a nonabstract declarator. Only treat an identifier
138 as a typename if followed by another identifier or a star. */
139 cla_nonabstract_decl
,
141 /* Never treat identifiers as typenames. */
146 extern c_token
* c_parser_peek_token (c_parser
*parser
);
147 extern c_token
* c_parser_peek_2nd_token (c_parser
*parser
);
148 extern c_token
* c_parser_peek_nth_token (c_parser
*parser
, unsigned int n
);
149 extern bool c_parser_require (c_parser
*parser
, enum cpp_ttype type
,
151 location_t matching_location
= UNKNOWN_LOCATION
,
152 bool type_is_unique
=true);
153 extern bool c_parser_error (c_parser
*parser
, const char *gmsgid
);
154 extern void c_parser_consume_token (c_parser
*parser
);
155 extern void c_parser_skip_until_found (c_parser
*parser
, enum cpp_ttype type
,
157 location_t
= UNKNOWN_LOCATION
);
158 extern bool c_parser_next_token_starts_declspecs (c_parser
*parser
);
159 bool c_parser_next_tokens_start_declaration (c_parser
*parser
);
160 bool c_token_starts_typename (c_token
*token
);
162 /* Abstraction to avoid defining c_parser here which messes up gengtype
163 output wrt ObjC due to vec<c_token> routines being put in gtype-c.h
164 but not gtype-objc.h. */
165 extern c_token
* c_parser_tokens_buf (c_parser
*parser
, unsigned n
);
166 extern bool c_parser_error (c_parser
*parser
);
167 extern void c_parser_set_error (c_parser
*parser
, bool);
169 /* A bit of a hack to have this here. It would be better in a c-decl.h. */
170 extern bool old_style_parameter_scope (void);
172 /* Return true if the next token from PARSER has the indicated
176 c_parser_next_token_is (c_parser
*parser
, enum cpp_ttype type
)
178 return c_parser_peek_token (parser
)->type
== type
;
181 /* Return true if the next token from PARSER does not have the
185 c_parser_next_token_is_not (c_parser
*parser
, enum cpp_ttype type
)
187 return !c_parser_next_token_is (parser
, type
);
190 /* Return true if the next token from PARSER is the indicated
194 c_parser_next_token_is_keyword (c_parser
*parser
, enum rid keyword
)
196 return c_parser_peek_token (parser
)->keyword
== keyword
;
199 struct c_expr
c_parser_string_literal (c_parser
*, bool, bool);
200 extern struct c_declarator
*
201 c_parser_declarator (c_parser
*parser
, bool type_seen_p
, c_dtr_syn kind
,
203 extern void c_parser_declspecs (c_parser
*, struct c_declspecs
*, bool, bool,
204 bool, bool, bool, bool, bool,
205 enum c_lookahead_kind
);
206 extern struct c_type_name
*c_parser_type_name (c_parser
*, bool = false);
207 extern bool c_maybe_parse_omp_decl (tree
, tree
);