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