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bc08ecba | 1 | /* Declarations for the parser for C and Objective-C. |
7adcbafe | 2 | Copyright (C) 1987-2022 Free Software Foundation, Inc. |
bc08ecba PG |
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.c | |
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 | source_range get_range () const | |
73 | { | |
74 | return get_range_from_loc (line_table, location); | |
75 | } | |
76 | ||
77 | location_t get_finish () const | |
78 | { | |
79 | return get_range ().m_finish; | |
80 | } | |
81 | }; | |
82 | ||
83 | /* The parser. */ | |
84 | struct c_parser; | |
85 | ||
86 | /* Possibly kinds of declarator to parse. */ | |
87 | enum c_dtr_syn { | |
88 | /* A normal declarator with an identifier. */ | |
89 | C_DTR_NORMAL, | |
90 | /* An abstract declarator (maybe empty). */ | |
91 | C_DTR_ABSTRACT, | |
92 | /* A parameter declarator: may be either, but after a type name does | |
93 | not redeclare a typedef name as an identifier if it can | |
94 | alternatively be interpreted as a typedef name; see DR#009, | |
95 | applied in C90 TC1, omitted from C99 and reapplied in C99 TC2 | |
96 | following DR#249. For example, given a typedef T, "int T" and | |
97 | "int *T" are valid parameter declarations redeclaring T, while | |
98 | "int (T)" and "int * (T)" and "int (T[])" and "int (T (int))" are | |
99 | abstract declarators rather than involving redundant parentheses; | |
100 | the same applies with attributes inside the parentheses before | |
101 | "T". */ | |
102 | C_DTR_PARM | |
103 | }; | |
104 | ||
105 | /* The binary operation precedence levels, where 0 is a dummy lowest level | |
106 | used for the bottom of the stack. */ | |
107 | enum c_parser_prec { | |
108 | PREC_NONE, | |
109 | PREC_LOGOR, | |
110 | PREC_LOGAND, | |
111 | PREC_BITOR, | |
112 | PREC_BITXOR, | |
113 | PREC_BITAND, | |
114 | PREC_EQ, | |
115 | PREC_REL, | |
116 | PREC_SHIFT, | |
117 | PREC_ADD, | |
118 | PREC_MULT, | |
119 | NUM_PRECS | |
120 | }; | |
121 | ||
122 | enum c_lookahead_kind { | |
123 | /* Always treat unknown identifiers as typenames. */ | |
124 | cla_prefer_type, | |
125 | ||
126 | /* Could be parsing a nonabstract declarator. Only treat an identifier | |
127 | as a typename if followed by another identifier or a star. */ | |
128 | cla_nonabstract_decl, | |
129 | ||
130 | /* Never treat identifiers as typenames. */ | |
131 | cla_prefer_id | |
132 | }; | |
133 | ||
134 | ||
135 | extern c_token * c_parser_peek_token (c_parser *parser); | |
136 | extern c_token * c_parser_peek_2nd_token (c_parser *parser); | |
137 | extern c_token * c_parser_peek_nth_token (c_parser *parser, unsigned int n); | |
138 | extern bool c_parser_require (c_parser *parser, enum cpp_ttype type, | |
32129a17 | 139 | const char *msgid, |
62e1c678 DM |
140 | location_t matching_location = UNKNOWN_LOCATION, |
141 | bool type_is_unique=true); | |
32129a17 | 142 | extern bool c_parser_error (c_parser *parser, const char *gmsgid); |
bc08ecba PG |
143 | extern void c_parser_consume_token (c_parser *parser); |
144 | extern void c_parser_skip_until_found (c_parser *parser, enum cpp_ttype type, | |
32129a17 DM |
145 | const char *msgid, |
146 | location_t = UNKNOWN_LOCATION); | |
bc08ecba PG |
147 | extern bool c_parser_next_token_starts_declspecs (c_parser *parser); |
148 | bool c_parser_next_tokens_start_declaration (c_parser *parser); | |
149 | bool c_token_starts_typename (c_token *token); | |
150 | ||
151 | /* Abstraction to avoid defining c_parser here which messes up gengtype | |
152 | output wrt ObjC due to vec<c_token> routines being put in gtype-c.h | |
153 | but not gtype-objc.h. */ | |
154 | extern c_token * c_parser_tokens_buf (c_parser *parser, unsigned n); | |
155 | extern bool c_parser_error (c_parser *parser); | |
156 | extern void c_parser_set_error (c_parser *parser, bool); | |
157 | ||
f7584c81 DP |
158 | /* A bit of a hack to have this here. It would be better in a c-decl.h. */ |
159 | extern bool old_style_parameter_scope (void); | |
160 | ||
bc08ecba PG |
161 | /* Return true if the next token from PARSER has the indicated |
162 | TYPE. */ | |
163 | ||
164 | static inline bool | |
165 | c_parser_next_token_is (c_parser *parser, enum cpp_ttype type) | |
166 | { | |
167 | return c_parser_peek_token (parser)->type == type; | |
168 | } | |
169 | ||
170 | /* Return true if the next token from PARSER does not have the | |
171 | indicated TYPE. */ | |
172 | ||
173 | static inline bool | |
174 | c_parser_next_token_is_not (c_parser *parser, enum cpp_ttype type) | |
175 | { | |
176 | return !c_parser_next_token_is (parser, type); | |
177 | } | |
178 | ||
179 | /* Return true if the next token from PARSER is the indicated | |
180 | KEYWORD. */ | |
181 | ||
182 | static inline bool | |
183 | c_parser_next_token_is_keyword (c_parser *parser, enum rid keyword) | |
184 | { | |
185 | return c_parser_peek_token (parser)->keyword == keyword; | |
186 | } | |
187 | ||
471c5330 | 188 | struct c_expr c_parser_string_literal (c_parser *, bool, bool); |
bc08ecba PG |
189 | extern struct c_declarator * |
190 | c_parser_declarator (c_parser *parser, bool type_seen_p, c_dtr_syn kind, | |
191 | bool *seen_id); | |
192 | extern void c_parser_declspecs (c_parser *, struct c_declspecs *, bool, bool, | |
4e03c3a7 JM |
193 | bool, bool, bool, bool, bool, |
194 | enum c_lookahead_kind); | |
4b2b493f | 195 | extern struct c_type_name *c_parser_type_name (c_parser *, bool = false); |
bc08ecba PG |
196 | |
197 | #endif |