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 extern int maybe_objc_comptypes
PROTO((tree
, tree
));
142 extern tree maybe_building_objc_message_expr
PROTO((void));
144 /* in c-aux-info.c */
145 extern void gen_aux_info_record
PROTO((tree
, int, int, int));
148 /* Print an error message for invalid operands to arith operation CODE.
149 NOP_EXPR is used as a special case (see truthvalue_conversion). */
150 extern void binary_op_error
PROTO((enum tree_code
));
151 extern void c_expand_expr_stmt
PROTO((tree
));
152 /* Validate the expression after `case' and apply default promotions. */
153 extern tree check_case_value
PROTO((tree
));
154 /* Concatenate a list of STRING_CST nodes into one STRING_CST. */
155 extern tree combine_strings
PROTO((tree
));
156 extern void constant_expression_warning
PROTO((tree
));
157 extern void decl_attributes
PROTO((tree
, tree
));
158 extern void declare_function_name
PROTO((void));
159 extern tree convert_and_check
PROTO((tree
, tree
));
160 extern void constant_expression_warning
PROTO((tree
));
161 extern void overflow_warning
PROTO((tree
));
162 extern void unsigned_conversion_warning
PROTO((tree
, tree
));
163 /* Read the rest of the current #-directive line. */
165 extern char *get_directive_line
PROTO((FILE *));
167 extern char *get_directive_line ();
168 /* Subroutine of build_binary_op, used for comparison operations.
169 See if the operands have both been converted from subword integer types
170 and, if so, perhaps change them both back to their original type. */
171 extern tree shorten_compare
PROTO((tree
*, tree
*, tree
*, enum tree_code
*));
172 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
173 or validate its data type for an `if' or `while' statement or ?..: exp. */
174 extern tree truthvalue_conversion
PROTO((tree
));
175 extern tree type_for_mode
PROTO((enum machine_mode
, int));
176 extern tree type_for_size
PROTO((unsigned, int));
179 extern tree convert
PROTO((tree
, tree
));
182 /* Standard named or nameless data types of the C compiler. */
183 extern tree char_array_type_node
;
184 extern tree char_type_node
;
185 extern tree const_ptr_type_node
;
186 extern tree const_string_type_node
;
187 extern tree default_function_type
;
188 extern tree double_ftype_double
;
189 extern tree double_ftype_double_double
;
190 extern tree double_type_node
;
191 extern tree float_type_node
;
192 extern tree intDI_type_node
;
193 extern tree intHI_type_node
;
194 extern tree intQI_type_node
;
195 extern tree intSI_type_node
;
196 extern tree int_array_type_node
;
197 extern tree int_ftype_cptr_cptr_sizet
;
198 extern tree int_ftype_int
;
199 extern tree int_ftype_ptr_ptr_int
;
200 extern tree int_ftype_string_string
;
201 extern tree integer_type_node
;
202 extern tree long_double_type_node
;
203 extern tree long_ftype_long
;
204 extern tree long_integer_type_node
;
205 extern tree long_long_integer_type_node
;
206 extern tree long_long_unsigned_type_node
;
207 extern tree long_unsigned_type_node
;
208 extern tree ptr_type_node
;
209 extern tree ptrdiff_type_node
;
210 extern tree short_integer_type_node
;
211 extern tree short_unsigned_type_node
;
212 extern tree signed_char_type_node
;
213 extern tree signed_wchar_type_node
;
214 extern tree string_ftype_ptr_ptr
;
215 extern tree string_type_node
;
216 extern tree unsigned_char_type_node
;
217 extern tree unsigned_intDI_type_node
;
218 extern tree unsigned_intHI_type_node
;
219 extern tree unsigned_intQI_type_node
;
220 extern tree unsigned_intSI_type_node
;
221 extern tree unsigned_type_node
;
222 extern tree unsigned_wchar_type_node
;
223 extern tree void_ftype_ptr_int_int
;
224 extern tree void_ftype_ptr_ptr_int
;
225 extern tree void_type_node
;
226 extern tree wchar_array_type_node
;
227 extern tree wchar_type_node
;
229 extern tree build_enumerator
PROTO((tree
, tree
));
230 /* Declare a predefined function. Return the declaration. */
231 extern tree builtin_function
PROTO((char *, tree
, enum built_in_function function_
, char *));
232 /* Add qualifiers to a type, in the fashion for C. */
233 extern tree c_build_type_variant
PROTO((tree
, int, int));
234 extern int c_decode_option
PROTO((char *));
235 extern void c_mark_varargs
PROTO((void));
236 extern tree check_identifier
PROTO((tree
, tree
));
237 extern void clear_parm_order
PROTO((void));
238 extern tree combine_parm_decls
PROTO((tree
, tree
, int));
239 extern int complete_array_type
PROTO((tree
, tree
, int));
240 extern void declare_parm_level
PROTO((int));
241 extern tree define_label
PROTO((char *, int, tree
));
242 extern void delete_block
PROTO((tree
));
243 extern void finish_decl
PROTO((tree
, tree
, tree
));
244 extern tree finish_enum
PROTO((tree
, tree
));
245 extern void finish_function
PROTO((int));
246 extern tree finish_struct
PROTO((tree
, tree
));
247 extern tree get_parm_info
PROTO((int));
248 extern tree getdecls
PROTO((void));
249 extern tree gettags
PROTO((void));
250 extern int global_bindings_p
PROTO((void));
251 extern tree grokfield
PROTO((char *, int, tree
, tree
, tree
));
252 extern tree groktypename
PROTO((tree
));
253 extern tree groktypename_in_parm_context
PROTO((tree
));
254 extern tree implicitly_declare
PROTO((tree
));
255 extern int in_parm_level_p
PROTO((void));
256 extern void init_decl_processing
PROTO((void));
257 extern void insert_block
PROTO((tree
));
258 extern void keep_next_level
PROTO((void));
259 extern int kept_level_p
PROTO((void));
260 extern tree lookup_label
PROTO((tree
));
261 extern tree lookup_name
PROTO((tree
));
262 extern tree maybe_build_cleanup
PROTO((tree
));
263 extern void parmlist_tags_warning
PROTO((void));
264 extern void pending_xref_error
PROTO((void));
265 extern void pop_c_function_context
PROTO((void));
266 extern void pop_label_level
PROTO((void));
267 extern tree poplevel
PROTO((int, int, int));
268 extern void print_lang_decl
PROTO((void));
270 extern void print_lang_identifier
PROTO((FILE *, tree
, int));
272 extern void print_lang_type
PROTO((void));
273 extern void push_c_function_context
PROTO((void));
274 extern void push_label_level
PROTO((void));
275 extern void push_parm_decl
PROTO((tree
));
276 extern tree pushdecl
PROTO((tree
));
277 extern tree pushdecl_top_level
PROTO((tree
));
278 extern void pushlevel
PROTO((int));
279 extern void pushtag
PROTO((tree
, tree
));
280 extern void set_block
PROTO((tree
));
281 extern tree shadow_label
PROTO((tree
));
282 extern void shadow_record_fields
PROTO((tree
));
283 extern void shadow_tag
PROTO((tree
));
284 extern void shadow_tag_warned
PROTO((tree
, int));
285 extern tree start_enum
PROTO((tree
));
286 extern int start_function
PROTO((tree
, tree
, int));
287 extern tree start_decl
PROTO((tree
, tree
, int));
288 extern tree start_struct
PROTO((enum tree_code
, tree
));
289 extern void store_parm_decls
PROTO((void));
290 extern tree xref_tag
PROTO((enum tree_code
, tree
));
293 extern tree build_array_ref
PROTO((tree
, tree
));
294 extern tree build_binary_op
PROTO((enum tree_code
, tree
, tree
, int));
295 extern tree build_c_cast
PROTO((tree
, tree
));
296 extern tree build_component_ref
PROTO((tree
, tree
));
297 extern tree build_compound_expr
PROTO((tree
));
298 extern tree build_conditional_expr
PROTO((tree
, tree
, tree
));
299 extern tree build_function_call
PROTO((tree
, tree
));
300 extern tree build_indirect_ref
PROTO((tree
, char *));
301 extern tree build_modify_expr
PROTO((tree
, enum tree_code
, tree
));
302 extern tree build_unary_op
PROTO((enum tree_code
, tree
, int));
303 extern tree c_alignof
PROTO((tree
));
304 extern tree c_alignof_expr
PROTO((tree
));
305 extern tree c_sizeof
PROTO((tree
));
306 extern tree c_expand_start_case
PROTO((tree
));
307 /* Given two integer or real types, return the type for their sum.
308 Given two compatible ANSI C types, returns the merged type. */
309 extern tree common_type
PROTO((tree
, tree
));
310 extern tree default_conversion
PROTO((tree
));
311 extern tree digest_init
PROTO((tree
, tree
, tree
*, int, int, char *));
312 extern tree parser_build_binary_op
PROTO((enum tree_code
, tree
, tree
));
313 extern void store_init_value
PROTO((tree
, tree
));
315 /* Set to 0 at beginning of a function definition, set to 1 if
316 a return statement that specifies a return value is seen. */
318 extern int current_function_returns_value
;
320 /* Set to 0 at beginning of a function definition, set to 1 if
321 a return statement with no argument is seen. */
323 extern int current_function_returns_null
;
325 /* Nonzero means `$' can be in an identifier. */
327 extern int dollars_in_ident
;
329 /* Nonzero means allow type mismatches in conditional expressions;
330 just make their values `void'. */
332 extern int flag_cond_mismatch
;
334 /* Nonzero means don't recognize the keyword `asm'. */
336 extern int flag_no_asm
;
338 /* Nonzero means ignore `#ident' directives. */
340 extern int flag_no_ident
;
342 /* Nonzero means warn about implicit declarations. */
344 extern int warn_implicit
;
346 /* Nonzero means give string constants the type `const char *'
347 to get extra warnings from them. These warnings will be too numerous
348 to be useful, except in thoroughly ANSIfied programs. */
350 extern int warn_write_strings
;
352 /* Nonzero means warn about sizeof (function) or addition/subtraction
353 of function pointers. */
355 extern int warn_pointer_arith
;
357 /* Nonzero means warn for all old-style non-prototype function decls. */
359 extern int warn_strict_prototypes
;
361 /* Nonzero means warn about multiple (redundant) decls for the same single
362 variable or function. */
364 extern int warn_redundant_decls
;
366 /* Nonzero means warn about extern declarations of objects not at
367 file-scope level and about *all* declarations of functions (whether
368 extern or static) not at file-scope level. Note that we exclude
369 implicit function declarations. To get warnings about those, use
372 extern int warn_nested_externs
;
374 /* Nonzero means warn about pointer casts that can drop a type qualifier
375 from the pointer target type. */
377 extern int warn_cast_qual
;
379 /* Warn about traditional constructs whose meanings changed in ANSI C. */
381 extern int warn_traditional
;
383 /* Warn about *printf or *scanf format/argument anomalies. */
385 extern int warn_format
;
387 /* Warn about a subscript that has type char. */
389 extern int warn_char_subscripts
;
391 /* Warn if a type conversion is done that might have confusing results. */
393 extern int warn_conversion
;
395 /* Nonzero means do some things the same way PCC does. */
397 extern int flag_traditional
;
399 /* Nonzero means warn about suggesting putting in ()'s. */
401 extern int warn_parentheses
;
403 /* Nonzero means this is a function to call to perform comptypes
404 on two record types. */
406 extern int (*comptypes_record_hook
) ();
408 /* Nonzero means we are reading code that came from a system header file. */
410 extern int system_header_p
;
412 #endif /* not _C_TREE_H */