source: trunk/third/gcc/c-tree.h @ 11288

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1/* Definitions for C parsing and type checking.
2   Copyright (C) 1987, 1993, 1994, 1995, 1997 Free Software Foundation, Inc.
3
4This file is part of GNU CC.
5
6GNU CC is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 2, or (at your option)
9any later version.
10
11GNU CC is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with GNU CC; see the file COPYING.  If not, write to
18the Free Software Foundation, 59 Temple Place - Suite 330,
19Boston, MA 02111-1307, USA.  */
20
21#ifndef _C_TREE_H
22#define _C_TREE_H
23
24/* Language-dependent contents of an identifier.  */
25
26/* The limbo_value is used for block level extern declarations, which need
27   to be type checked against subsequent extern declarations.  They can't
28   be referenced after they fall out of scope, so they can't be global.  */
29
30struct lang_identifier
31{
32  struct tree_identifier ignore;
33  tree global_value, local_value, label_value, implicit_decl;
34  tree error_locus, limbo_value;
35};
36
37/* Macros for access to language-specific slots in an identifier.  */
38/* Each of these slots contains a DECL node or null.  */
39
40/* This represents the value which the identifier has in the
41   file-scope namespace.  */
42#define IDENTIFIER_GLOBAL_VALUE(NODE)   \
43  (((struct lang_identifier *) (NODE))->global_value)
44/* This represents the value which the identifier has in the current
45   scope.  */
46#define IDENTIFIER_LOCAL_VALUE(NODE)    \
47  (((struct lang_identifier *) (NODE))->local_value)
48/* This represents the value which the identifier has as a label in
49   the current label scope.  */
50#define IDENTIFIER_LABEL_VALUE(NODE)    \
51  (((struct lang_identifier *) (NODE))->label_value)
52/* This records the extern decl of this identifier, if it has had one
53   at any point in this compilation.  */
54#define IDENTIFIER_LIMBO_VALUE(NODE)    \
55  (((struct lang_identifier *) (NODE))->limbo_value)
56/* This records the implicit function decl of this identifier, if it
57   has had one at any point in this compilation.  */
58#define IDENTIFIER_IMPLICIT_DECL(NODE)  \
59  (((struct lang_identifier *) (NODE))->implicit_decl)
60/* This is the last function in which we printed an "undefined variable"
61   message for this identifier.  Value is a FUNCTION_DECL or null.  */
62#define IDENTIFIER_ERROR_LOCUS(NODE)    \
63  (((struct lang_identifier *) (NODE))->error_locus)
64
65/* In identifiers, C uses the following fields in a special way:
66   TREE_PUBLIC        to record that there was a previous local extern decl.
67   TREE_USED          to record that such a decl was used.
68   TREE_ADDRESSABLE   to record that the address of such a decl was used.  */
69
70/* Nonzero means reject anything that ANSI standard C forbids.  */
71extern int pedantic;
72
73/* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
74#define C_TYPE_FIELDS_READONLY(type) TREE_LANG_FLAG_1 (type)
75
76/* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
77#define C_TYPE_FIELDS_VOLATILE(type) TREE_LANG_FLAG_2 (type)
78
79/* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
80   nonzero if the definition of the type has already started.  */
81#define C_TYPE_BEING_DEFINED(type) TYPE_LANG_FLAG_0 (type)
82
83/* In a RECORD_TYPE, a sorted array of the fields of the type.  */
84struct lang_type
85{
86  int len;
87  tree elts[1];
88};
89
90/* Mark which labels are explicitly declared.
91   These may be shadowed, and may be referenced from nested functions.  */
92#define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
93
94/* Record whether a type or decl was written with nonconstant size.
95   Note that TYPE_SIZE may have simplified to a constant.  */
96#define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type)
97#define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type)
98
99/* Record in each node resulting from a binary operator
100   what operator was specified for it.  */
101#define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
102
103#if 0 /* Not used.  */
104/* Record whether a decl for a function or function pointer has
105   already been mentioned (in a warning) because it was called
106   but didn't have a prototype.  */
107#define C_MISSING_PROTOTYPE_WARNED(decl) DECL_LANG_FLAG_2(decl)
108#endif
109
110/* Store a value in that field.  */
111#define C_SET_EXP_ORIGINAL_CODE(exp, code) \
112  (TREE_COMPLEXITY (exp) = (int) (code))
113
114/* Record whether a typedef for type `int' was actually `signed int'.  */
115#define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp))
116
117/* Nonzero for a declaration of a built in function if there has been no
118   occasion that would declare the function in ordinary C.
119   Using the function draws a pedantic warning in this case.  */
120#define C_DECL_ANTICIPATED(exp) DECL_LANG_FLAG_3 ((exp))
121
122/* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
123   TYPE_ARG_TYPES for functions with prototypes, but created for functions
124   without prototypes.  */
125#define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_NONCOPIED_PARTS (NODE)
126
127/* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
128#define DECL_C_BIT_FIELD(NODE) DECL_LANG_FLAG_4 (NODE)
129
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))
140
141/* In a VAR_DECL, means the variable is really an iterator.  */
142#define ITERATOR_P(D) (DECL_LANG_FLAG_4(D))
143
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)
147
148/* in c-lang.c and objc-act.c */
149extern tree lookup_interface                    PROTO((tree));
150extern tree is_class_name                       PROTO((tree));
151extern void maybe_objc_check_decl               PROTO((tree));
152extern int maybe_objc_comptypes                 PROTO((tree, tree, int));
153extern tree maybe_building_objc_message_expr    PROTO((void));
154extern tree maybe_objc_method_name              PROTO((tree));
155extern int recognize_objc_keyword               PROTO((void));
156extern tree build_objc_string                   PROTO((int, char *));
157
158/* in c-aux-info.c */
159extern void gen_aux_info_record                 PROTO((tree, int, int, int));
160
161/* in c-common.c */
162extern void declare_function_name               PROTO((void));
163extern void decl_attributes                     PROTO((tree, tree, tree));
164extern void init_function_format_info           PROTO((void));
165extern void record_function_format              PROTO((tree, tree, int, int, int));
166extern void check_function_format               PROTO((tree, tree, tree));
167/* Print an error message for invalid operands to arith operation CODE.
168   NOP_EXPR is used as a special case (see truthvalue_conversion).  */
169extern void binary_op_error                     PROTO((enum tree_code));
170extern void c_expand_expr_stmt                  PROTO((tree));
171/* Validate the expression after `case' and apply default promotions.  */
172extern tree check_case_value                    PROTO((tree));
173/* Concatenate a list of STRING_CST nodes into one STRING_CST.  */
174extern tree combine_strings                     PROTO((tree));
175extern void constant_expression_warning         PROTO((tree));
176extern tree convert_and_check                   PROTO((tree, tree));
177extern void overflow_warning                    PROTO((tree));
178extern void unsigned_conversion_warning         PROTO((tree, tree));
179/* Read the rest of the current #-directive line.  */
180extern char *get_directive_line                 PROTO((FILE *));
181/* Subroutine of build_binary_op, used for comparison operations.
182   See if the operands have both been converted from subword integer types
183   and, if so, perhaps change them both back to their original type.  */
184extern tree shorten_compare                     PROTO((tree *, tree *, tree *, enum tree_code *));
185/* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
186   or validate its data type for an `if' or `while' statement or ?..: exp. */
187extern tree truthvalue_conversion               PROTO((tree));
188extern tree type_for_mode                       PROTO((enum machine_mode, int));
189extern tree type_for_size                       PROTO((unsigned, int));
190
191/* in c-convert.c */
192extern tree convert                             PROTO((tree, tree));
193
194/* in c-decl.c */
195/* Standard named or nameless data types of the C compiler.  */
196extern tree char_array_type_node;
197extern tree char_type_node;
198extern tree const_ptr_type_node;
199extern tree const_string_type_node;
200extern tree default_function_type;
201extern tree double_ftype_double;
202extern tree double_ftype_double_double;
203extern tree double_type_node;
204extern tree float_type_node;
205extern tree intDI_type_node;
206extern tree intHI_type_node;
207extern tree intQI_type_node;
208extern tree intSI_type_node;
209extern tree int_array_type_node;
210extern tree int_ftype_cptr_cptr_sizet;
211extern tree int_ftype_int;
212extern tree int_ftype_ptr_ptr_int;
213extern tree int_ftype_string_string;
214extern tree integer_type_node;
215extern tree long_double_type_node;
216extern tree long_ftype_long;
217extern tree long_integer_type_node;
218extern tree long_long_integer_type_node;
219extern tree long_long_unsigned_type_node;
220extern tree long_unsigned_type_node;
221extern tree complex_integer_type_node;
222extern tree complex_float_type_node;
223extern tree complex_double_type_node;
224extern tree complex_long_double_type_node;
225extern tree ptr_type_node;
226extern tree ptrdiff_type_node;
227extern tree short_integer_type_node;
228extern tree short_unsigned_type_node;
229extern tree signed_char_type_node;
230extern tree signed_wchar_type_node;
231extern tree string_ftype_ptr_ptr;
232extern tree string_type_node;
233extern tree unsigned_char_type_node;
234extern tree unsigned_intDI_type_node;
235extern tree unsigned_intHI_type_node;
236extern tree unsigned_intQI_type_node;
237extern tree unsigned_intSI_type_node;
238extern tree unsigned_type_node;
239extern tree unsigned_wchar_type_node;
240extern tree void_ftype_ptr_int_int;
241extern tree void_ftype_ptr_ptr_int;
242extern tree void_type_node;
243extern tree wchar_array_type_node;
244extern tree wchar_type_node;
245extern tree boolean_type_node;
246extern tree boolean_true_node;
247extern tree boolean_false_node;
248
249extern tree build_enumerator                    PROTO((tree, tree));
250/* Declare a predefined function.  Return the declaration.  */
251extern tree builtin_function                    PROTO((char *, tree, enum built_in_function function_, char *));
252/* Add qualifiers to a type, in the fashion for C.  */
253extern tree c_build_type_variant                PROTO((tree, int, int));
254extern int  c_decode_option                     PROTO((char *));
255extern void c_mark_varargs                      PROTO((void));
256extern tree check_identifier                    PROTO((tree, tree));
257extern void clear_parm_order                    PROTO((void));
258extern tree combine_parm_decls                  PROTO((tree, tree, int));
259extern int  complete_array_type                 PROTO((tree, tree, int));
260extern void declare_parm_level                  PROTO((int));
261extern tree define_label                        PROTO((char *, int, tree));
262extern void delete_block                        PROTO((tree));
263extern void finish_decl                         PROTO((tree, tree, tree));
264extern void finish_decl_top_level               PROTO((tree, tree, tree));
265extern tree finish_enum                         PROTO((tree, tree, tree));
266extern void finish_function                     PROTO((int));
267extern tree finish_struct                       PROTO((tree, tree, tree));
268extern tree get_parm_info                       PROTO((int));
269extern tree getdecls                            PROTO((void));
270extern tree gettags                             PROTO((void));
271extern int  global_bindings_p                   PROTO((void));
272extern tree grokfield                           PROTO((char *, int, tree, tree, tree));
273extern tree groktypename                        PROTO((tree));
274extern tree groktypename_in_parm_context        PROTO((tree));
275extern tree implicitly_declare                  PROTO((tree));
276extern int  in_parm_level_p                     PROTO((void));
277extern void init_decl_processing                PROTO((void));
278extern void insert_block                        PROTO((tree));
279extern void keep_next_level                     PROTO((void));
280extern int  kept_level_p                        PROTO((void));
281extern tree lookup_label                        PROTO((tree));
282extern tree lookup_name                         PROTO((tree));
283extern tree lookup_name_current_level           PROTO((tree));
284extern tree lookup_name_current_level_global    PROTO((tree));
285extern tree maybe_build_cleanup                 PROTO((tree));
286extern void parmlist_tags_warning               PROTO((void));
287extern void pending_xref_error                  PROTO((void));
288extern void pop_c_function_context              PROTO((void));
289extern void pop_label_level                     PROTO((void));
290extern tree poplevel                            PROTO((int, int, int));
291extern void print_lang_decl                     PROTO((FILE *, tree, int));
292extern void print_lang_identifier               PROTO((FILE *, tree, int));
293extern void print_lang_type                     PROTO((FILE *, tree, int));
294extern void push_c_function_context             PROTO((void));
295extern void push_label_level                    PROTO((void));
296extern void push_parm_decl                      PROTO((tree));
297extern tree pushdecl                            PROTO((tree));
298extern tree pushdecl_top_level                  PROTO((tree));
299extern void pushlevel                           PROTO((int));
300extern void pushtag                             PROTO((tree, tree));
301extern void set_block                           PROTO((tree));
302extern tree shadow_label                        PROTO((tree));
303extern void shadow_record_fields                PROTO((tree));
304extern void shadow_tag                          PROTO((tree));
305extern void shadow_tag_warned                   PROTO((tree, int));
306extern tree start_enum                          PROTO((tree));
307extern int  start_function                      PROTO((tree, tree, tree,
308                                                       tree, int));
309extern tree start_decl                          PROTO((tree, tree, int,
310                                                       tree, tree));
311extern tree start_struct                        PROTO((enum tree_code, tree));
312extern void store_parm_decls                    PROTO((void));
313extern tree xref_tag                            PROTO((enum tree_code, tree));
314
315/* in c-typeck.c */
316extern tree require_complete_type               PROTO((tree));
317extern void incomplete_type_error               PROTO((tree, 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.  */
320extern tree common_type                         PROTO((tree, tree));
321extern int comptypes                            PROTO((tree, tree));
322extern int self_promoting_args_p                PROTO((tree));
323extern tree c_sizeof                            PROTO((tree));
324extern tree c_sizeof_nowarn                     PROTO((tree));
325extern tree c_size_in_bytes                     PROTO((tree));
326extern tree c_alignof                           PROTO((tree));
327extern tree c_alignof_expr                      PROTO((tree));
328extern tree default_conversion                  PROTO((tree));
329extern tree build_component_ref                 PROTO((tree, tree));
330extern tree build_indirect_ref                  PROTO((tree, char *));
331extern tree build_array_ref                     PROTO((tree, tree));
332extern tree build_function_call                 PROTO((tree, tree));
333extern tree parser_build_binary_op              PROTO((enum tree_code,
334                                                       tree, tree));
335extern tree build_binary_op                     PROTO((enum tree_code,
336                                                       tree, tree, int));
337extern tree build_unary_op                      PROTO((enum tree_code,
338                                                       tree, int));
339extern int lvalue_p                             PROTO((tree));
340extern int lvalue_or_else                       PROTO((tree, char *));
341extern void readonly_warning                    PROTO((tree, char *));
342extern int mark_addressable                     PROTO((tree));
343extern tree build_conditional_expr              PROTO((tree, tree, tree));
344extern tree build_compound_expr                 PROTO((tree));
345extern tree build_c_cast                        PROTO((tree, tree));
346extern tree build_modify_expr                   PROTO((tree, enum tree_code,
347                                                       tree));
348extern tree initializer_constant_valid_p        PROTO((tree, tree));
349extern void store_init_value                    PROTO((tree, tree));
350extern void error_init                          PROTO((char *, char *,
351                                                       char *));
352extern void pedwarn_init                        PROTO((char *, char *,
353                                                       char *));
354extern void start_init                          PROTO((tree, tree, int));
355extern void finish_init                         PROTO((void));
356extern void really_start_incremental_init       PROTO((tree));
357extern void push_init_level                     PROTO((int));
358extern tree pop_init_level                      PROTO((int));
359extern void set_init_index                      PROTO((tree, tree));
360extern void set_init_label                      PROTO((tree));
361extern void process_init_element                PROTO((tree));
362extern void c_expand_asm_operands               PROTO((tree, tree, tree, tree,
363                                                       int, char *, int));
364extern void c_expand_return                     PROTO((tree));
365extern tree c_expand_start_case                 PROTO((tree));
366
367/* in c-iterate.c */
368extern void iterator_expand                     PROTO((tree));
369extern void iterator_for_loop_start             PROTO((tree));
370extern void iterator_for_loop_end               PROTO((tree));
371extern void iterator_for_loop_record            PROTO((tree));
372extern void push_iterator_stack                 PROTO((void));
373extern void pop_iterator_stack                  PROTO((void));
374
375/* Set to 0 at beginning of a function definition, set to 1 if
376   a return statement that specifies a return value is seen.  */
377
378extern int current_function_returns_value;
379
380/* Set to 0 at beginning of a function definition, set to 1 if
381   a return statement with no argument is seen.  */
382
383extern int current_function_returns_null;
384
385/* Nonzero means the expression being parsed will never be evaluated.
386   This is a count, since unevaluated expressions can nest.  */
387
388extern int skip_evaluation;
389
390/* Nonzero means `$' can be in an identifier.  */
391
392extern int dollars_in_ident;
393
394/* Nonzero means allow type mismatches in conditional expressions;
395   just make their values `void'.   */
396
397extern int flag_cond_mismatch;
398
399/* Nonzero means don't recognize the keyword `asm'.  */
400
401extern int flag_no_asm;
402
403/* Nonzero means environment is hosted (i.e., not freestanding) */
404
405extern int flag_hosted;
406
407/* Nonzero means ignore `#ident' directives.  */
408
409extern int flag_no_ident;
410
411/* Nonzero means warn about implicit declarations.  */
412
413extern int warn_implicit;
414
415/* Nonzero means give string constants the type `const char *'
416   to get extra warnings from them.  These warnings will be too numerous
417   to be useful, except in thoroughly ANSIfied programs.  */
418
419extern int warn_write_strings;
420
421/* Nonzero means warn about sizeof (function) or addition/subtraction
422   of function pointers.  */
423
424extern int warn_pointer_arith;
425
426/* Nonzero means warn for all old-style non-prototype function decls.  */
427
428extern int warn_strict_prototypes;
429
430/* Nonzero means warn about multiple (redundant) decls for the same single
431   variable or function.  */
432
433extern int warn_redundant_decls;
434
435/* Nonzero means warn about extern declarations of objects not at
436   file-scope level and about *all* declarations of functions (whether
437   extern or static) not at file-scope level.  Note that we exclude
438   implicit function declarations.  To get warnings about those, use
439   -Wimplicit.  */
440
441extern int warn_nested_externs;
442
443/* Nonzero means warn about pointer casts that can drop a type qualifier
444   from the pointer target type.  */
445
446extern int warn_cast_qual;
447
448/* Nonzero means warn when casting a function call to a type that does
449   not match the return type (e.g. (float)sqrt() or (anything*)malloc()
450   when there is no previous declaration of sqrt or malloc.  */
451
452extern int warn_bad_function_cast;
453
454/* Warn about traditional constructs whose meanings changed in ANSI C.  */
455
456extern int warn_traditional;
457
458/* Warn about *printf or *scanf format/argument anomalies. */
459
460extern int warn_format;
461
462/* Warn about a subscript that has type char.  */
463
464extern int warn_char_subscripts;
465
466/* Warn if a type conversion is done that might have confusing results.  */
467
468extern int warn_conversion;
469
470/* Warn if main is suspicious. */
471
472extern int warn_main;
473
474/* Nonzero means do some things the same way PCC does.  */
475
476extern int flag_traditional;
477
478/* Nonzero means to allow single precision math even if we're generally
479   being traditional. */
480extern int flag_allow_single_precision;
481
482/* Nonzero means warn about suggesting putting in ()'s.  */
483
484extern int warn_parentheses;
485
486/* Warn if initializer is not completely bracketed.  */
487
488extern int warn_missing_braces;
489
490/* Warn about comparison of signed and unsigned values.  */
491
492extern int warn_sign_compare;
493
494/* Nonzero means this is a function to call to perform comptypes
495   on two record types.  */
496
497extern int (*comptypes_record_hook) ();
498
499/* Nonzero means we are reading code that came from a system header file.  */
500
501extern int system_header_p;
502
503/* Nonzero enables objc features.  */
504
505extern int doing_objc_thang;
506
507#endif /* not _C_TREE_H */
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