1 /* Definitions for C parsing and type checking.
2 Copyright (C) 1987, 1993 Free Software Foundation, Inc.
4 This file is part of GNU CC.
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)
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.
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. */
25 #define STDIO_PROTO(ARGS) PROTO(ARGS)
27 #define STDIO_PROTO(ARGS) ()
31 /* Language-dependent contents of an identifier. */
33 /* The limbo_value is used for block level extern declarations, which need
34 to be type checked against subsequent extern declarations. They can't
35 be referenced after they fall out of scope, so they can't be global. */
37 struct lang_identifier
39 struct tree_identifier ignore;
40 tree global_value, local_value, label_value, implicit_decl;
41 tree error_locus, limbo_value;
44 /* Macros for access to language-specific slots in an identifier. */
45 /* Each of these slots contains a DECL node or null. */
47 /* This represents the value which the identifier has in the
48 file-scope namespace. */
49 #define IDENTIFIER_GLOBAL_VALUE(NODE) \
50 (((struct lang_identifier *)(NODE))->global_value)
51 /* This represents the value which the identifier has in the current
53 #define IDENTIFIER_LOCAL_VALUE(NODE) \
54 (((struct lang_identifier *)(NODE))->local_value)
55 /* This represents the value which the identifier has as a label in
56 the current label scope. */
57 #define IDENTIFIER_LABEL_VALUE(NODE) \
58 (((struct lang_identifier *)(NODE))->label_value)
59 /* This records the extern decl of this identifier, if it has had one
60 at any point in this compilation. */
61 #define IDENTIFIER_LIMBO_VALUE(NODE) \
62 (((struct lang_identifier *)(NODE))->limbo_value)
63 /* This records the implicit function decl of this identifier, if it
64 has had one at any point in this compilation. */
65 #define IDENTIFIER_IMPLICIT_DECL(NODE) \
66 (((struct lang_identifier *)(NODE))->implicit_decl)
67 /* This is the last function in which we printed an "undefined variable"
68 message for this identifier. Value is a FUNCTION_DECL or null. */
69 #define IDENTIFIER_ERROR_LOCUS(NODE) \
70 (((struct lang_identifier *)(NODE))->error_locus)
72 /* In identifiers, C uses the following fields in a special way:
73 TREE_PUBLIC to record that there was a previous local extern decl.
74 TREE_USED to record that such a decl was used.
75 TREE_ADDRESSABLE to record that the address of such a decl was used. */
77 /* Nonzero means reject anything that ANSI standard C forbids. */
80 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
81 #define C_TYPE_FIELDS_READONLY(type) TREE_LANG_FLAG_1 (type)
83 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */
84 #define C_TYPE_FIELDS_VOLATILE(type) TREE_LANG_FLAG_2 (type)
86 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
87 nonzero if the definition of the type has already started. */
88 #define C_TYPE_BEING_DEFINED(type) TYPE_LANG_FLAG_0 (type)
90 /* In a RECORD_TYPE, a sorted array of the fields of the type. */
97 /* Mark which labels are explicitly declared.
98 These may be shadowed, and may be referenced from nested functions. */
99 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
101 /* Record whether a type or decl was written with nonconstant size.
102 Note that TYPE_SIZE may have simplified to a constant. */
103 #define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type)
104 #define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type)
106 /* Record in each node resulting from a binary operator
107 what operator was specified for it. */
108 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
110 #if 0 /* Not used. */
111 /* Record whether a decl for a function or function pointer has
112 already been mentioned (in a warning) because it was called
113 but didn't have a prototype. */
114 #define C_MISSING_PROTOTYPE_WARNED(decl) DECL_LANG_FLAG_2(decl)
117 /* Store a value in that field. */
118 #define C_SET_EXP_ORIGINAL_CODE(exp, code) \
119 (TREE_COMPLEXITY (exp) = (int)(code))
121 /* Record whether a typedef for type `int' was actually `signed int'. */
122 #define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp))
124 /* Nonzero for a declaration of a built in function if there has been no
125 occasion that would declare the function in ordinary C.
126 Using the function draws a pedantic warning in this case. */
127 #define C_DECL_ANTICIPATED(exp) DECL_LANG_FLAG_3 ((exp))
129 /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
130 TYPE_ARG_TYPES for functions with prototypes, but created for functions
131 without prototypes. */
132 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_NONCOPIED_PARTS (NODE)
134 /* Nonzero if the type T promotes to itself.
135 ANSI C states explicitly the list of types that promote;
136 in particular, short promotes to int even if they have the same width. */
137 #define C_PROMOTING_INTEGER_TYPE_P(t) \
138 (TREE_CODE ((t)) == INTEGER_TYPE \
139 && (TYPE_MAIN_VARIANT (t) == char_type_node \
140 || TYPE_MAIN_VARIANT (t) == signed_char_type_node \
141 || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node \
142 || TYPE_MAIN_VARIANT (t) == short_integer_type_node \
143 || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node))
145 /* In a VAR_DECL, means the variable is really an iterator. */
146 #define ITERATOR_P(D) (DECL_LANG_FLAG_4(D))
148 /* In a VAR_DECL for an iterator, means we are within
149 an explicit loop over that iterator. */
150 #define ITERATOR_BOUND_P(NODE) ((NODE)->common.readonly_flag)
152 /* in c-lang.c and objc-act.c */
153 extern tree lookup_interface PROTO((tree));
154 extern tree is_class_name PROTO((tree));
155 extern void maybe_objc_check_decl PROTO((tree));
156 extern int maybe_objc_comptypes PROTO((tree, tree, int));
157 extern tree maybe_building_objc_message_expr PROTO((void));
158 extern tree maybe_objc_method_name PROTO((tree));
159 extern int recognize_objc_keyword PROTO((void));
160 extern tree build_objc_string PROTO((int, char *));
162 /* in c-aux-info.c */
163 extern void gen_aux_info_record PROTO((tree, int, int, int));
166 /* Print an error message for invalid operands to arith operation CODE.
167 NOP_EXPR is used as a special case (see truthvalue_conversion). */
168 extern void binary_op_error PROTO((enum tree_code));
169 extern void c_expand_expr_stmt PROTO((tree));
170 /* Validate the expression after `case' and apply default promotions. */
171 extern tree check_case_value PROTO((tree));
172 /* Concatenate a list of STRING_CST nodes into one STRING_CST. */
173 extern tree combine_strings PROTO((tree));
174 extern void constant_expression_warning PROTO((tree));
175 extern void decl_attributes PROTO((tree, tree));
176 extern void declare_function_name PROTO((void));
177 extern tree convert_and_check PROTO((tree, tree));
178 extern void overflow_warning PROTO((tree));
179 extern void unsigned_conversion_warning PROTO((tree, tree));
180 /* Read the rest of the current #-directive line. */
181 extern char *get_directive_line STDIO_PROTO((FILE *));
182 /* Subroutine of build_binary_op, used for comparison operations.
183 See if the operands have both been converted from subword integer types
184 and, if so, perhaps change them both back to their original type. */
185 extern tree shorten_compare PROTO((tree *, tree *, tree *, enum tree_code *));
186 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
187 or validate its data type for an `if' or `while' statement or ?..: exp. */
188 extern tree truthvalue_conversion PROTO((tree));
189 extern tree type_for_mode PROTO((enum machine_mode, int));
190 extern tree type_for_size PROTO((unsigned, int));
193 extern tree convert PROTO((tree, tree));
196 /* Standard named or nameless data types of the C compiler. */
197 extern tree char_array_type_node;
198 extern tree char_type_node;
199 extern tree const_ptr_type_node;
200 extern tree const_string_type_node;
201 extern tree default_function_type;
202 extern tree double_ftype_double;
203 extern tree double_ftype_double_double;
204 extern tree double_type_node;
205 extern tree float_type_node;
206 extern tree intDI_type_node;
207 extern tree intHI_type_node;
208 extern tree intQI_type_node;
209 extern tree intSI_type_node;
210 extern tree int_array_type_node;
211 extern tree int_ftype_cptr_cptr_sizet;
212 extern tree int_ftype_int;
213 extern tree int_ftype_ptr_ptr_int;
214 extern tree int_ftype_string_string;
215 extern tree integer_type_node;
216 extern tree long_double_type_node;
217 extern tree long_ftype_long;
218 extern tree long_integer_type_node;
219 extern tree long_long_integer_type_node;
220 extern tree long_long_unsigned_type_node;
221 extern tree long_unsigned_type_node;
222 extern tree complex_integer_type_node;
223 extern tree complex_float_type_node;
224 extern tree complex_double_type_node;
225 extern tree complex_long_double_type_node;
226 extern tree ptr_type_node;
227 extern tree ptrdiff_type_node;
228 extern tree short_integer_type_node;
229 extern tree short_unsigned_type_node;
230 extern tree signed_char_type_node;
231 extern tree signed_wchar_type_node;
232 extern tree string_ftype_ptr_ptr;
233 extern tree string_type_node;
234 extern tree unsigned_char_type_node;
235 extern tree unsigned_intDI_type_node;
236 extern tree unsigned_intHI_type_node;
237 extern tree unsigned_intQI_type_node;
238 extern tree unsigned_intSI_type_node;
239 extern tree unsigned_type_node;
240 extern tree unsigned_wchar_type_node;
241 extern tree void_ftype_ptr_int_int;
242 extern tree void_ftype_ptr_ptr_int;
243 extern tree void_type_node;
244 extern tree wchar_array_type_node;
245 extern tree wchar_type_node;
247 extern tree build_enumerator PROTO((tree, tree));
248 /* Declare a predefined function. Return the declaration. */
249 extern tree builtin_function PROTO((char *, tree, enum built_in_function function_, char *));
250 /* Add qualifiers to a type, in the fashion for C. */
251 extern tree c_build_type_variant PROTO((tree, int, int));
252 extern int c_decode_option PROTO((char *));
253 extern void c_mark_varargs PROTO((void));
254 extern tree check_identifier PROTO((tree, tree));
255 extern void clear_parm_order PROTO((void));
256 extern tree combine_parm_decls PROTO((tree, tree, int));
257 extern int complete_array_type PROTO((tree, tree, int));
258 extern void declare_parm_level PROTO((int));
259 extern tree define_label PROTO((char *, int, tree));
260 extern void delete_block PROTO((tree));
261 extern void finish_decl PROTO((tree, tree, tree));
262 extern tree finish_enum PROTO((tree, tree));
263 extern void finish_function PROTO((int));
264 extern tree finish_struct PROTO((tree, tree));
265 extern tree get_parm_info PROTO((int));
266 extern tree getdecls PROTO((void));
267 extern tree gettags PROTO((void));
268 extern int global_bindings_p PROTO((void));
269 extern tree grokfield PROTO((char *, int, tree, tree, tree));
270 extern tree groktypename PROTO((tree));
271 extern tree groktypename_in_parm_context PROTO((tree));
272 extern tree implicitly_declare PROTO((tree));
273 extern int in_parm_level_p PROTO((void));
274 extern void init_decl_processing PROTO((void));
275 extern void insert_block PROTO((tree));
276 extern void keep_next_level PROTO((void));
277 extern int kept_level_p PROTO((void));
278 extern tree lookup_label PROTO((tree));
279 extern tree lookup_name PROTO((tree));
280 extern tree lookup_name_current_level PROTO((tree));
281 extern tree maybe_build_cleanup PROTO((tree));
282 extern void parmlist_tags_warning PROTO((void));
283 extern void pending_xref_error PROTO((void));
284 extern void pop_c_function_context PROTO((void));
285 extern void pop_label_level PROTO((void));
286 extern tree poplevel PROTO((int, int, int));
287 extern void print_lang_decl PROTO((void));
288 extern void print_lang_identifier STDIO_PROTO((FILE *, tree,
290 extern void print_lang_type PROTO((void));
291 extern void push_c_function_context PROTO((void));
292 extern void push_label_level PROTO((void));
293 extern void push_parm_decl PROTO((tree));
294 extern tree pushdecl PROTO((tree));
295 extern tree pushdecl_top_level PROTO((tree));
296 extern void pushlevel PROTO((int));
297 extern void pushtag PROTO((tree, tree));
298 extern void set_block PROTO((tree));
299 extern tree shadow_label PROTO((tree));
300 extern void shadow_record_fields PROTO((tree));
301 extern void shadow_tag PROTO((tree));
302 extern void shadow_tag_warned PROTO((tree, int));
303 extern tree start_enum PROTO((tree));
304 extern int start_function PROTO((tree, tree, int));
305 extern tree start_decl PROTO((tree, tree, int));
306 extern tree start_struct PROTO((enum tree_code, tree));
307 extern void store_parm_decls PROTO((void));
308 extern tree xref_tag PROTO((enum tree_code, tree));
311 extern tree build_array_ref PROTO((tree, tree));
312 extern tree build_binary_op PROTO((enum tree_code, tree, tree, int));
313 extern tree build_c_cast PROTO((tree, tree));
314 extern tree build_component_ref PROTO((tree, tree));
315 extern tree build_compound_expr PROTO((tree));
316 extern tree build_conditional_expr PROTO((tree, tree, tree));
317 extern tree build_function_call PROTO((tree, tree));
318 extern tree build_indirect_ref PROTO((tree, char *));
319 extern tree build_modify_expr PROTO((tree, enum tree_code, tree));
320 extern tree build_unary_op PROTO((enum tree_code, tree, int));
321 extern tree c_alignof PROTO((tree));
322 extern tree c_alignof_expr PROTO((tree));
323 extern tree c_sizeof PROTO((tree));
324 extern tree c_expand_start_case PROTO((tree));
325 /* Given two integer or real types, return the type for their sum.
326 Given two compatible ANSI C types, returns the merged type. */
327 extern tree common_type PROTO((tree, tree));
328 extern tree default_conversion PROTO((tree));
329 extern tree digest_init PROTO((tree, tree, tree *, int, int, char *));
330 extern tree parser_build_binary_op PROTO((enum tree_code, tree, tree));
331 extern tree require_complete_type PROTO((tree));
332 extern void store_init_value PROTO((tree, tree));
335 extern void iterator_expand PROTO((tree));
336 extern void iterator_for_loop_start PROTO((tree));
337 extern void iterator_for_loop_end PROTO((tree));
338 extern void iterator_for_loop_record PROTO((tree));
339 extern void push_iterator_stack PROTO((void));
340 extern void pop_iterator_stack PROTO((void));
342 /* Set to 0 at beginning of a function definition, set to 1 if
343 a return statement that specifies a return value is seen. */
345 extern int current_function_returns_value;
347 /* Set to 0 at beginning of a function definition, set to 1 if
348 a return statement with no argument is seen. */
350 extern int current_function_returns_null;
352 /* Nonzero means `$' can be in an identifier. */
354 extern int dollars_in_ident;
356 /* Nonzero means allow type mismatches in conditional expressions;
357 just make their values `void'. */
359 extern int flag_cond_mismatch;
361 /* Nonzero means don't recognize the keyword `asm'. */
363 extern int flag_no_asm;
365 /* Nonzero means ignore `#ident' directives. */
367 extern int flag_no_ident;
369 /* Nonzero means warn about implicit declarations. */
371 extern int warn_implicit;
373 /* Nonzero means give string constants the type `const char *'
374 to get extra warnings from them. These warnings will be too numerous
375 to be useful, except in thoroughly ANSIfied programs. */
377 extern int warn_write_strings;
379 /* Nonzero means warn about sizeof (function) or addition/subtraction
380 of function pointers. */
382 extern int warn_pointer_arith;
384 /* Nonzero means warn for all old-style non-prototype function decls. */
386 extern int warn_strict_prototypes;
388 /* Nonzero means warn about multiple (redundant) decls for the same single
389 variable or function. */
391 extern int warn_redundant_decls;
393 /* Nonzero means warn about extern declarations of objects not at
394 file-scope level and about *all* declarations of functions (whether
395 extern or static) not at file-scope level. Note that we exclude
396 implicit function declarations. To get warnings about those, use
399 extern int warn_nested_externs;
401 /* Nonzero means warn about pointer casts that can drop a type qualifier
402 from the pointer target type. */
404 extern int warn_cast_qual;
406 /* Warn about traditional constructs whose meanings changed in ANSI C. */
408 extern int warn_traditional;
410 /* Warn about *printf or *scanf format/argument anomalies. */
412 extern int warn_format;
414 /* Warn about a subscript that has type char. */
416 extern int warn_char_subscripts;
418 /* Warn if a type conversion is done that might have confusing results. */
420 extern int warn_conversion;
422 /* Nonzero means do some things the same way PCC does. */
424 extern int flag_traditional;
426 /* Nonzero means warn about suggesting putting in ()'s. */
428 extern int warn_parentheses;
430 /* Warn if initializer is not completely bracketed. */
432 extern int warn_missing_braces;
434 /* Nonzero means this is a function to call to perform comptypes
435 on two record types. */
437 extern int (*comptypes_record_hook) ();
439 /* Nonzero means we are reading code that came from a system header file. */
441 extern int system_header_p;
443 /* Nonzero enables objc features. */
445 extern int doing_objc_thang;
447 #endif /* not _C_TREE_H */