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 extern void declare_function_name PROTO((void));
167 extern void decl_attributes PROTO((tree, tree));
168 extern void init_function_format_info PROTO((void));
169 extern void record_function_format PROTO((tree, tree, int, int, int));
170 extern void check_function_format PROTO((tree, tree, tree));
171 /* Print an error message for invalid operands to arith operation CODE.
172 NOP_EXPR is used as a special case (see truthvalue_conversion). */
173 extern void binary_op_error PROTO((enum tree_code));
174 extern void c_expand_expr_stmt PROTO((tree));
175 /* Validate the expression after `case' and apply default promotions. */
176 extern tree check_case_value PROTO((tree));
177 /* Concatenate a list of STRING_CST nodes into one STRING_CST. */
178 extern tree combine_strings PROTO((tree));
179 extern void constant_expression_warning PROTO((tree));
180 extern tree convert_and_check PROTO((tree, tree));
181 extern void overflow_warning PROTO((tree));
182 extern void unsigned_conversion_warning PROTO((tree, tree));
183 /* Read the rest of the current #-directive line. */
184 extern char *get_directive_line STDIO_PROTO((FILE *));
185 /* Subroutine of build_binary_op, used for comparison operations.
186 See if the operands have both been converted from subword integer types
187 and, if so, perhaps change them both back to their original type. */
188 extern tree shorten_compare PROTO((tree *, tree *, tree *, enum tree_code *));
189 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
190 or validate its data type for an `if' or `while' statement or ?..: exp. */
191 extern tree truthvalue_conversion PROTO((tree));
192 extern tree type_for_mode PROTO((enum machine_mode, int));
193 extern tree type_for_size PROTO((unsigned, int));
196 extern tree convert PROTO((tree, tree));
199 /* Standard named or nameless data types of the C compiler. */
200 extern tree char_array_type_node;
201 extern tree char_type_node;
202 extern tree const_ptr_type_node;
203 extern tree const_string_type_node;
204 extern tree default_function_type;
205 extern tree double_ftype_double;
206 extern tree double_ftype_double_double;
207 extern tree double_type_node;
208 extern tree float_type_node;
209 extern tree intDI_type_node;
210 extern tree intHI_type_node;
211 extern tree intQI_type_node;
212 extern tree intSI_type_node;
213 extern tree int_array_type_node;
214 extern tree int_ftype_cptr_cptr_sizet;
215 extern tree int_ftype_int;
216 extern tree int_ftype_ptr_ptr_int;
217 extern tree int_ftype_string_string;
218 extern tree integer_type_node;
219 extern tree long_double_type_node;
220 extern tree long_ftype_long;
221 extern tree long_integer_type_node;
222 extern tree long_long_integer_type_node;
223 extern tree long_long_unsigned_type_node;
224 extern tree long_unsigned_type_node;
225 extern tree complex_integer_type_node;
226 extern tree complex_float_type_node;
227 extern tree complex_double_type_node;
228 extern tree complex_long_double_type_node;
229 extern tree ptr_type_node;
230 extern tree ptrdiff_type_node;
231 extern tree short_integer_type_node;
232 extern tree short_unsigned_type_node;
233 extern tree signed_char_type_node;
234 extern tree signed_wchar_type_node;
235 extern tree string_ftype_ptr_ptr;
236 extern tree string_type_node;
237 extern tree unsigned_char_type_node;
238 extern tree unsigned_intDI_type_node;
239 extern tree unsigned_intHI_type_node;
240 extern tree unsigned_intQI_type_node;
241 extern tree unsigned_intSI_type_node;
242 extern tree unsigned_type_node;
243 extern tree unsigned_wchar_type_node;
244 extern tree void_ftype_ptr_int_int;
245 extern tree void_ftype_ptr_ptr_int;
246 extern tree void_type_node;
247 extern tree wchar_array_type_node;
248 extern tree wchar_type_node;
250 extern tree build_enumerator PROTO((tree, tree));
251 /* Declare a predefined function. Return the declaration. */
252 extern tree builtin_function PROTO((char *, tree, enum built_in_function function_, char *));
253 /* Add qualifiers to a type, in the fashion for C. */
254 extern tree c_build_type_variant PROTO((tree, int, int));
255 extern int c_decode_option PROTO((char *));
256 extern void c_mark_varargs PROTO((void));
257 extern tree check_identifier PROTO((tree, tree));
258 extern void clear_parm_order PROTO((void));
259 extern tree combine_parm_decls PROTO((tree, tree, int));
260 extern int complete_array_type PROTO((tree, tree, int));
261 extern void declare_parm_level PROTO((int));
262 extern tree define_label PROTO((char *, int, tree));
263 extern void delete_block PROTO((tree));
264 extern void finish_decl PROTO((tree, tree, tree));
265 extern tree finish_enum PROTO((tree, tree));
266 extern void finish_function PROTO((int));
267 extern tree finish_struct PROTO((tree, tree));
268 extern tree get_parm_info PROTO((int));
269 extern tree getdecls PROTO((void));
270 extern tree gettags PROTO((void));
271 extern int global_bindings_p PROTO((void));
272 extern tree grokfield PROTO((char *, int, tree, tree, tree));
273 extern tree groktypename PROTO((tree));
274 extern tree groktypename_in_parm_context PROTO((tree));
275 extern tree implicitly_declare PROTO((tree));
276 extern int in_parm_level_p PROTO((void));
277 extern void init_decl_processing PROTO((void));
278 extern void insert_block PROTO((tree));
279 extern void keep_next_level PROTO((void));
280 extern int kept_level_p PROTO((void));
281 extern tree lookup_label PROTO((tree));
282 extern tree lookup_name PROTO((tree));
283 extern tree lookup_name_current_level PROTO((tree));
284 extern tree maybe_build_cleanup PROTO((tree));
285 extern void parmlist_tags_warning PROTO((void));
286 extern void pending_xref_error PROTO((void));
287 extern void pop_c_function_context PROTO((void));
288 extern void pop_label_level PROTO((void));
289 extern tree poplevel PROTO((int, int, int));
290 extern void print_lang_decl STDIO_PROTO((FILE *, tree,
292 extern void print_lang_identifier STDIO_PROTO((FILE *, tree,
294 extern void print_lang_type STDIO_PROTO((FILE *, tree,
296 extern void push_c_function_context PROTO((void));
297 extern void push_label_level PROTO((void));
298 extern void push_parm_decl PROTO((tree));
299 extern tree pushdecl PROTO((tree));
300 extern tree pushdecl_top_level PROTO((tree));
301 extern void pushlevel PROTO((int));
302 extern void pushtag PROTO((tree, tree));
303 extern void set_block PROTO((tree));
304 extern tree shadow_label PROTO((tree));
305 extern void shadow_record_fields PROTO((tree));
306 extern void shadow_tag PROTO((tree));
307 extern void shadow_tag_warned PROTO((tree, int));
308 extern tree start_enum PROTO((tree));
309 extern int start_function PROTO((tree, tree, int));
310 extern tree start_decl PROTO((tree, tree, int));
311 extern tree start_struct PROTO((enum tree_code, tree));
312 extern void store_parm_decls PROTO((void));
313 extern tree xref_tag PROTO((enum tree_code, tree));
316 extern tree build_array_ref PROTO((tree, tree));
317 extern tree build_binary_op PROTO((enum tree_code, tree, tree, int));
318 extern tree build_c_cast PROTO((tree, tree));
319 extern tree build_component_ref PROTO((tree, tree));
320 extern tree build_compound_expr PROTO((tree));
321 extern tree build_conditional_expr PROTO((tree, tree, tree));
322 extern tree build_function_call PROTO((tree, tree));
323 extern tree build_indirect_ref PROTO((tree, char *));
324 extern tree build_modify_expr PROTO((tree, enum tree_code, tree));
325 extern tree build_unary_op PROTO((enum tree_code, tree, int));
326 extern tree c_alignof PROTO((tree));
327 extern tree c_alignof_expr PROTO((tree));
328 extern tree c_sizeof PROTO((tree));
329 extern tree c_expand_start_case PROTO((tree));
330 /* Given two integer or real types, return the type for their sum.
331 Given two compatible ANSI C types, returns the merged type. */
332 extern tree common_type PROTO((tree, tree));
333 extern tree default_conversion PROTO((tree));
334 extern tree parser_build_binary_op PROTO((enum tree_code, tree, tree));
335 extern tree require_complete_type PROTO((tree));
336 extern void store_init_value PROTO((tree, tree));
337 extern void start_init PROTO((tree, tree, int));
338 extern void finish_init PROTO((void));
339 extern void really_start_incremental_init PROTO((tree));
340 extern void push_init_level PROTO((int));
341 extern tree pop_init_level PROTO((int));
342 extern void set_init_index PROTO((tree, tree));
343 extern void set_init_label PROTO((tree));
344 extern void process_init_element PROTO((tree));
347 extern void iterator_expand PROTO((tree));
348 extern void iterator_for_loop_start PROTO((tree));
349 extern void iterator_for_loop_end PROTO((tree));
350 extern void iterator_for_loop_record PROTO((tree));
351 extern void push_iterator_stack PROTO((void));
352 extern void pop_iterator_stack PROTO((void));
354 /* Set to 0 at beginning of a function definition, set to 1 if
355 a return statement that specifies a return value is seen. */
357 extern int current_function_returns_value;
359 /* Set to 0 at beginning of a function definition, set to 1 if
360 a return statement with no argument is seen. */
362 extern int current_function_returns_null;
364 /* Nonzero means `$' can be in an identifier. */
366 extern int dollars_in_ident;
368 /* Nonzero means allow type mismatches in conditional expressions;
369 just make their values `void'. */
371 extern int flag_cond_mismatch;
373 /* Nonzero means don't recognize the keyword `asm'. */
375 extern int flag_no_asm;
377 /* Nonzero means ignore `#ident' directives. */
379 extern int flag_no_ident;
381 /* Nonzero means warn about implicit declarations. */
383 extern int warn_implicit;
385 /* Nonzero means give string constants the type `const char *'
386 to get extra warnings from them. These warnings will be too numerous
387 to be useful, except in thoroughly ANSIfied programs. */
389 extern int warn_write_strings;
391 /* Nonzero means warn about sizeof (function) or addition/subtraction
392 of function pointers. */
394 extern int warn_pointer_arith;
396 /* Nonzero means warn for all old-style non-prototype function decls. */
398 extern int warn_strict_prototypes;
400 /* Nonzero means warn about multiple (redundant) decls for the same single
401 variable or function. */
403 extern int warn_redundant_decls;
405 /* Nonzero means warn about extern declarations of objects not at
406 file-scope level and about *all* declarations of functions (whether
407 extern or static) not at file-scope level. Note that we exclude
408 implicit function declarations. To get warnings about those, use
411 extern int warn_nested_externs;
413 /* Nonzero means warn about pointer casts that can drop a type qualifier
414 from the pointer target type. */
416 extern int warn_cast_qual;
418 /* Warn about traditional constructs whose meanings changed in ANSI C. */
420 extern int warn_traditional;
422 /* Warn about *printf or *scanf format/argument anomalies. */
424 extern int warn_format;
426 /* Warn about a subscript that has type char. */
428 extern int warn_char_subscripts;
430 /* Warn if a type conversion is done that might have confusing results. */
432 extern int warn_conversion;
434 /* Nonzero means do some things the same way PCC does. */
436 extern int flag_traditional;
438 /* Nonzero means to allow single precision math even if we're generally
439 being traditional. */
440 extern int flag_allow_single_precision;
442 /* Nonzero means warn about suggesting putting in ()'s. */
444 extern int warn_parentheses;
446 /* Warn if initializer is not completely bracketed. */
448 extern int warn_missing_braces;
450 /* Nonzero means this is a function to call to perform comptypes
451 on two record types. */
453 extern int (*comptypes_record_hook) ();
455 /* Nonzero means we are reading code that came from a system header file. */
457 extern int system_header_p;
459 /* Nonzero enables objc features. */
461 extern int doing_objc_thang;
463 #endif /* not _C_TREE_H */