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1 | /* Definitions for C parsing and type checking. |
2 | Copyright (C) 1987 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GNU CC. | |
5 | ||
6 | GNU CC is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU CC is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU CC; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | /* Language-dependent contents of an identifier. */ | |
21 | ||
22 | struct lang_identifier | |
23 | { | |
24 | struct tree_identifier ignore; | |
25 | tree global_value, local_value, label_value, implicit_decl; | |
26 | tree error_locus; | |
27 | }; | |
28 | ||
29 | /* Macros for access to language-specific slots in an identifier. */ | |
30 | ||
31 | #define IDENTIFIER_GLOBAL_VALUE(NODE) \ | |
32 | (((struct lang_identifier *)(NODE))->global_value) | |
33 | #define IDENTIFIER_LOCAL_VALUE(NODE) \ | |
34 | (((struct lang_identifier *)(NODE))->local_value) | |
35 | #define IDENTIFIER_LABEL_VALUE(NODE) \ | |
36 | (((struct lang_identifier *)(NODE))->label_value) | |
37 | #define IDENTIFIER_IMPLICIT_DECL(NODE) \ | |
38 | (((struct lang_identifier *)(NODE))->implicit_decl) | |
39 | #define IDENTIFIER_ERROR_LOCUS(NODE) \ | |
40 | (((struct lang_identifier *)(NODE))->error_locus) | |
41 | ||
42 | /* In identifiers, C uses the following fields in a special way: | |
43 | TREE_PUBLIC to record that there was a previous local extern decl. | |
44 | TREE_USED to record that such a decl was used. | |
45 | TREE_ADDRESSABLE to record that the address of such a decl was used. */ | |
46 | ||
47 | /* Nonzero means reject anything that ANSI standard C forbids. */ | |
48 | extern int pedantic; | |
49 | ||
50 | /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */ | |
51 | #define C_TYPE_FIELDS_READONLY(type) TREE_LANG_FLAG_1 (type) | |
52 | ||
53 | /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */ | |
54 | #define C_TYPE_FIELDS_VOLATILE(type) TREE_LANG_FLAG_2 (type) | |
55 | ||
56 | /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE | |
57 | nonzero if the definition of the type has already started. */ | |
58 | #define C_TYPE_BEING_DEFINED(type) TYPE_LANG_FLAG_0 (type) | |
59 | ||
60 | /* In a RECORD_TYPE, a sorted array of the fields of the type. */ | |
61 | struct lang_type | |
62 | { | |
63 | int len; | |
64 | tree elts[1]; | |
65 | }; | |
66 | ||
67 | /* Mark which labels are explicitly declared. | |
68 | These may be shadowed, and may be referenced from nested functions. */ | |
69 | #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label) | |
70 | ||
71 | /* Record whether a type or decl was written with nonconstant size. | |
72 | Note that TYPE_SIZE may have simplified to a constant. */ | |
73 | #define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type) | |
74 | #define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type) | |
75 | ||
76 | /* Record in each node resulting from a binary operator | |
77 | what operator was specified for it. */ | |
78 | #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp)) | |
79 | ||
80 | #if 0 /* Not used. */ | |
81 | /* Record whether a decl for a function or function pointer has | |
82 | already been mentioned (in a warning) because it was called | |
83 | but didn't have a prototype. */ | |
84 | #define C_MISSING_PROTOTYPE_WARNED(decl) DECL_LANG_FLAG_2(decl) | |
85 | #endif | |
86 | ||
87 | /* Store a value in that field. */ | |
88 | #define C_SET_EXP_ORIGINAL_CODE(exp, code) \ | |
89 | (TREE_COMPLEXITY (exp) = (int)(code)) | |
90 | ||
91 | /* Record whether a typedef for type `int' was actually `signed int'. */ | |
92 | #define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp)) | |
93 | ||
94 | /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as | |
95 | TYPE_ARG_TYPES for functions with prototypes, but created for functions | |
96 | without prototypes. */ | |
97 | #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_NONCOPIED_PARTS (NODE) | |
98 | \f | |
99 | /* in c-typecheck.c */ | |
100 | extern tree build_component_ref (), build_conditional_expr (), build_compound_expr (); | |
101 | extern tree build_unary_op (), build_binary_op (), build_function_call (); | |
102 | extern tree parser_build_binary_op (); | |
103 | extern tree build_indirect_ref (), build_array_ref (), build_c_cast (); | |
104 | extern tree build_modify_expr (); | |
105 | extern tree c_sizeof (), c_alignof (), c_alignof_expr (); | |
106 | extern void store_init_value (); | |
107 | extern tree digest_init (); | |
108 | extern tree c_expand_start_case (); | |
109 | extern tree default_conversion (); | |
110 | ||
111 | /* Given two integer or real types, return the type for their sum. | |
112 | Given two compatible ANSI C types, returns the merged type. */ | |
113 | ||
114 | extern tree common_type (); | |
115 | ||
116 | /* in c-decl.c */ | |
117 | extern tree build_label (); | |
118 | ||
119 | extern int start_function (); | |
120 | extern void finish_function (); | |
121 | extern void store_parm_decls (); | |
122 | extern tree get_parm_info (); | |
123 | extern tree combine_parm_decls (); | |
124 | ||
125 | extern void pushlevel (); | |
126 | extern tree poplevel (); | |
127 | ||
128 | extern tree groktypename (), lookup_name (); | |
129 | ||
130 | extern tree lookup_label (), define_label (), shadow_label (); | |
131 | ||
132 | extern tree implicitly_declare (), getdecls (), gettags (); | |
133 | ||
134 | extern tree start_decl (); | |
135 | extern void finish_decl (); | |
136 | ||
137 | extern tree start_struct (), finish_struct (), xref_tag (); | |
138 | extern tree grokfield (); | |
139 | ||
140 | extern tree start_enum (), finish_enum (); | |
141 | extern tree build_enumerator (); | |
142 | ||
143 | extern tree make_index_type (); | |
144 | ||
145 | /* Add qualifiers to a type, in the fashion for C. */ | |
146 | extern tree c_build_type_variant (); | |
147 | ||
3cfd4ab5 RS |
148 | /* Declare a predefined function. Return the declaration. */ |
149 | extern tree builtin_function (); | |
150 | ||
40754343 RS |
151 | /* Functions in c-common.c: */ |
152 | ||
153 | /* Concatenate a list of STRING_CST nodes into one STRING_CST. */ | |
154 | extern tree combine_strings (); | |
155 | ||
156 | /* Validate the expression after `case' and apply default promotions. */ | |
157 | extern tree check_case_value (); | |
158 | ||
159 | /* Print an error message for invalid operands to arith operation CODE. | |
160 | NOP_EXPR is used as a special case (see truthvalue_conversion). */ | |
161 | ||
162 | extern void binary_op_error (); | |
163 | ||
164 | /* Subroutine of build_binary_op, used for comparison operations. | |
165 | See if the operands have both been converted from subword integer types | |
166 | and, if so, perhaps change them both back to their original type. */ | |
167 | ||
168 | extern tree shorten_compare (); | |
169 | ||
170 | /* Read the rest of the current #-directive line. */ | |
171 | extern char *get_directive_line (); | |
172 | ||
173 | extern int maybe_objc_comptypes (); | |
174 | extern tree maybe_building_objc_message_expr (); | |
175 | \f | |
176 | /* Standard named or nameless data types of the C compiler. */ | |
177 | ||
178 | extern tree short_integer_type_node, integer_type_node; | |
179 | extern tree long_integer_type_node, long_long_integer_type_node; | |
180 | extern tree short_unsigned_type_node, unsigned_type_node; | |
181 | extern tree long_unsigned_type_node, long_long_unsigned_type_node; | |
182 | extern tree ptrdiff_type_node; | |
183 | extern tree unsigned_char_type_node, signed_char_type_node, char_type_node; | |
184 | extern tree wchar_type_node, signed_wchar_type_node, unsigned_wchar_type_node; | |
185 | extern tree float_type_node, double_type_node, long_double_type_node; | |
186 | extern tree void_type_node, ptr_type_node, const_ptr_type_node; | |
187 | extern tree string_type_node, const_string_type_node; | |
188 | extern tree char_array_type_node, int_array_type_node, wchar_array_type_node; | |
189 | extern tree default_function_type; | |
190 | extern tree double_ftype_double, double_ftype_double_double; | |
191 | extern tree int_ftype_int, long_ftype_long; | |
192 | extern tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int; | |
193 | extern tree void_ftype_ptr_int_int, string_ftype_ptr_ptr; | |
194 | extern tree int_ftype_string_string, int_ftype_cptr_cptr_sizet; | |
195 | ||
196 | /* Set to 0 at beginning of a function definition, set to 1 if | |
197 | a return statement that specifies a return value is seen. */ | |
198 | ||
199 | extern int current_function_returns_value; | |
200 | ||
201 | /* Set to 0 at beginning of a function definition, set to 1 if | |
202 | a return statement with no argument is seen. */ | |
203 | ||
204 | extern int current_function_returns_null; | |
205 | ||
206 | /* Nonzero means `$' can be in an identifier. */ | |
207 | ||
208 | extern int dollars_in_ident; | |
209 | ||
210 | /* Nonzero means allow type mismatches in conditional expressions; | |
211 | just make their values `void'. */ | |
212 | ||
213 | extern int flag_cond_mismatch; | |
214 | ||
215 | /* Nonzero means don't recognize the keyword `asm'. */ | |
216 | ||
217 | extern int flag_no_asm; | |
218 | ||
219 | /* Nonzero means ignore `#ident' directives. */ | |
220 | ||
221 | extern int flag_no_ident; | |
222 | ||
223 | /* Nonzero means warn about implicit declarations. */ | |
224 | ||
225 | extern int warn_implicit; | |
226 | ||
227 | /* Nonzero means give string constants the type `const char *' | |
228 | to get extra warnings from them. These warnings will be too numerous | |
229 | to be useful, except in thoroughly ANSIfied programs. */ | |
230 | ||
231 | extern int warn_write_strings; | |
232 | ||
233 | /* Nonzero means warn about sizeof (function) or addition/subtraction | |
234 | of function pointers. */ | |
235 | ||
236 | extern int warn_pointer_arith; | |
237 | ||
238 | /* Nonzero means warn for all old-style non-prototype function decls. */ | |
239 | ||
240 | extern int warn_strict_prototypes; | |
241 | ||
242 | /* Nonzero means warn about multiple (redundant) decls for the same single | |
243 | variable or function. */ | |
244 | ||
245 | extern int warn_redundant_decls; | |
246 | ||
247 | /* Nonzero means warn about extern declarations of objects not at | |
248 | file-scope level and about *all* declarations of functions (whether | |
249 | extern or static) not at file-scope level. Note that we exclude | |
250 | implicit function declarations. To get warnings about those, use | |
251 | -Wimplicit. */ | |
252 | ||
253 | extern int warn_nested_externs; | |
254 | ||
255 | /* Nonzero means warn about pointer casts that can drop a type qualifier | |
256 | from the pointer target type. */ | |
257 | ||
258 | extern int warn_cast_qual; | |
259 | ||
260 | /* Warn about traditional constructs whose meanings changed in ANSI C. */ | |
261 | ||
262 | extern int warn_traditional; | |
263 | ||
264 | /* Warn about *printf or *scanf format/argument anomalies. */ | |
265 | ||
266 | extern int warn_format; | |
267 | ||
268 | /* Warn about a subscript that has type char. */ | |
269 | ||
270 | extern int warn_char_subscripts; | |
271 | ||
272 | /* Warn if a type conversion is done that might have confusing results. */ | |
273 | ||
274 | extern int warn_conversion; | |
275 | ||
276 | /* Nonzero means do some things the same way PCC does. */ | |
277 | ||
278 | extern int flag_traditional; | |
279 | ||
280 | /* Nonzero means warn about suggesting putting in ()'s. */ | |
281 | ||
282 | extern int warn_parentheses; | |
283 | ||
284 | /* Nonzero means this is a function to call to perform comptypes | |
285 | on two record types. */ | |
286 | ||
287 | extern int (*comptypes_record_hook) (); | |
288 | ||
289 | /* Nonzero means we are reading code that came from a system header file. */ | |
290 | ||
291 | extern int system_header_p; |