Line data Source code
1 : /* Declarations for the parser for C and Objective-C.
2 : Copyright (C) 1987-2026 Free Software Foundation, Inc.
3 :
4 : Parser actions based on the old Bison parser; structure somewhat
5 : influenced by and fragments based on the C++ parser.
6 :
7 : This file is part of GCC.
8 :
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
12 : version.
13 :
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
17 : for more details.
18 :
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/>. */
22 :
23 : #ifndef GCC_C_PARSER_H
24 : #define GCC_C_PARSER_H
25 :
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.
32 :
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. */
36 :
37 : /* More information about the type of a CPP_NAME token. */
38 : enum c_id_kind {
39 : /* An ordinary identifier. */
40 : C_ID_ID,
41 : /* An identifier declared as a typedef name. */
42 : C_ID_TYPENAME,
43 : /* An identifier declared as an Objective-C class name. */
44 : C_ID_CLASSNAME,
45 : /* An address space identifier. */
46 : C_ID_ADDRSPACE,
47 : /* Not an identifier. */
48 : C_ID_NONE
49 : };
50 :
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. */
66 : location_t location;
67 : /* The value associated with this token, if any. */
68 : tree value;
69 : /* Token flags. */
70 : unsigned char flags;
71 :
72 288614559 : source_range get_range () const
73 : {
74 235908708 : return get_range_from_loc (line_table, location);
75 : }
76 :
77 52705851 : location_t get_finish () const
78 : {
79 52705851 : return get_range ().m_finish;
80 : }
81 : };
82 :
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
85 : GTY itself. */
86 : struct c_tree_token_vec_struct {
87 : struct tree_base base;
88 : vec<c_token, va_gc> *tokens;
89 : };
90 :
91 : #define C_TOKEN_VEC_TOKENS(NODE) \
92 : (((struct c_tree_token_vec_struct *) TREE_CHECK (NODE, C_TOKEN_VEC))->tokens)
93 :
94 : /* The parser. */
95 : struct c_parser;
96 :
97 : /* Possibly kinds of declarator to parse. */
98 : enum c_dtr_syn {
99 : /* A normal declarator with an identifier. */
100 : C_DTR_NORMAL,
101 : /* An abstract declarator (maybe empty). */
102 : C_DTR_ABSTRACT,
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
112 : "T". */
113 : C_DTR_PARM
114 : };
115 :
116 : /* The binary operation precedence levels, where 0 is a dummy lowest level
117 : used for the bottom of the stack. */
118 : enum c_parser_prec {
119 : PREC_NONE,
120 : PREC_LOGOR,
121 : PREC_LOGAND,
122 : PREC_BITOR,
123 : PREC_BITXOR,
124 : PREC_BITAND,
125 : PREC_EQ,
126 : PREC_REL,
127 : PREC_SHIFT,
128 : PREC_ADD,
129 : PREC_MULT,
130 : NUM_PRECS
131 : };
132 :
133 : enum c_lookahead_kind {
134 : /* Always treat unknown identifiers as typenames. */
135 : cla_prefer_type,
136 :
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,
140 :
141 : /* Never treat identifiers as typenames. */
142 : cla_prefer_id
143 : };
144 :
145 :
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,
150 : const char *msgid,
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,
156 : const char *msgid,
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 : unsigned int n = 1);
161 : bool c_token_starts_typename (c_token *token);
162 :
163 : /* Abstraction to avoid defining c_parser here which messes up gengtype
164 : output wrt ObjC due to vec<c_token> routines being put in gtype-c.h
165 : but not gtype-objc.h. */
166 : extern c_token * c_parser_tokens_buf (c_parser *parser, unsigned n);
167 : extern bool c_parser_error (c_parser *parser);
168 : extern void c_parser_set_error (c_parser *parser, bool);
169 :
170 : /* A bit of a hack to have this here. It would be better in a c-decl.h. */
171 : extern bool old_style_parameter_scope (void);
172 :
173 : /* Return true if the next token from PARSER has the indicated
174 : TYPE. */
175 :
176 : inline bool
177 7964081430 : c_parser_next_token_is (c_parser *parser, enum cpp_ttype type)
178 : {
179 5458436500 : return c_parser_peek_token (parser)->type == type;
180 : }
181 :
182 : /* Return true if the next token from PARSER does not have the
183 : indicated TYPE. */
184 :
185 : inline bool
186 588916391 : c_parser_next_token_is_not (c_parser *parser, enum cpp_ttype type)
187 : {
188 552653038 : return !c_parser_next_token_is (parser, type);
189 : }
190 :
191 : /* Return true if the next token from PARSER is the indicated
192 : KEYWORD. */
193 :
194 : inline bool
195 866560574 : c_parser_next_token_is_keyword (c_parser *parser, enum rid keyword)
196 : {
197 697615290 : return c_parser_peek_token (parser)->keyword == keyword;
198 : }
199 :
200 : struct c_expr c_parser_string_literal (c_parser *, bool, bool);
201 : extern struct c_declarator *
202 : c_parser_declarator (c_parser *parser, bool type_seen_p, c_dtr_syn kind,
203 : bool *seen_id);
204 : extern void c_parser_declspecs (c_parser *, struct c_declspecs *, bool, bool,
205 : bool, bool, bool, bool, bool,
206 : enum c_lookahead_kind);
207 : extern struct c_type_name *c_parser_type_name (c_parser *, bool = false);
208 : extern bool c_maybe_parse_omp_decl (tree, tree);
209 :
210 : #endif
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