source: trunk/third/gcc/c-tree.h @ 8834

Revision 8834, 20.6 KB checked in by ghudson, 28 years ago (diff)
This commit was generated by cvs2svn to compensate for changes in r8833, which included commits to RCS files with non-trunk default branches.
Line 
1/* Definitions for C parsing and type checking.
2   Copyright (C) 1987, 1993, 1994, 1995 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/* Nonzero if the type T promotes to itself.
128   ANSI C states explicitly the list of types that promote;
129   in particular, short promotes to int even if they have the same width.  */
130#define C_PROMOTING_INTEGER_TYPE_P(t)                           \
131  (TREE_CODE ((t)) == INTEGER_TYPE                              \
132   && (TYPE_MAIN_VARIANT (t) == char_type_node                  \
133       || TYPE_MAIN_VARIANT (t) == signed_char_type_node        \
134       || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node      \
135       || TYPE_MAIN_VARIANT (t) == short_integer_type_node      \
136       || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node))
137
138/* In a VAR_DECL, means the variable is really an iterator.  */
139#define ITERATOR_P(D) (DECL_LANG_FLAG_4(D))
140
141/* In a VAR_DECL for an iterator, means we are within
142   an explicit loop over that iterator.  */
143#define ITERATOR_BOUND_P(NODE) ((NODE)->common.readonly_flag)
144
145/* in c-lang.c and objc-act.c */
146extern tree lookup_interface                    PROTO((tree));
147extern tree is_class_name                       PROTO((tree));
148extern void maybe_objc_check_decl               PROTO((tree));
149extern int maybe_objc_comptypes                 PROTO((tree, tree, int));
150extern tree maybe_building_objc_message_expr    PROTO((void));
151extern tree maybe_objc_method_name              PROTO((tree));
152extern int recognize_objc_keyword               PROTO((void));
153extern tree build_objc_string                   PROTO((int, char *));
154
155/* in c-aux-info.c */
156extern void gen_aux_info_record                 PROTO((tree, int, int, int));
157
158/* in c-common.c */
159extern void declare_function_name               PROTO((void));
160extern void decl_attributes                     PROTO((tree, tree, tree));
161extern void init_function_format_info           PROTO((void));
162extern void record_function_format              PROTO((tree, tree, int, int, int));
163extern void check_function_format               PROTO((tree, tree, tree));
164/* Print an error message for invalid operands to arith operation CODE.
165   NOP_EXPR is used as a special case (see truthvalue_conversion).  */
166extern void binary_op_error                     PROTO((enum tree_code));
167extern void c_expand_expr_stmt                  PROTO((tree));
168/* Validate the expression after `case' and apply default promotions.  */
169extern tree check_case_value                    PROTO((tree));
170/* Concatenate a list of STRING_CST nodes into one STRING_CST.  */
171extern tree combine_strings                     PROTO((tree));
172extern void constant_expression_warning         PROTO((tree));
173extern tree convert_and_check                   PROTO((tree, tree));
174extern void overflow_warning                    PROTO((tree));
175extern void unsigned_conversion_warning         PROTO((tree, tree));
176/* Read the rest of the current #-directive line.  */
177extern char *get_directive_line                 STDIO_PROTO((FILE *));
178/* Subroutine of build_binary_op, used for comparison operations.
179   See if the operands have both been converted from subword integer types
180   and, if so, perhaps change them both back to their original type.  */
181extern tree shorten_compare                     PROTO((tree *, tree *, tree *, enum tree_code *));
182/* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
183   or validate its data type for an `if' or `while' statement or ?..: exp. */
184extern tree truthvalue_conversion               PROTO((tree));
185extern tree type_for_mode                       PROTO((enum machine_mode, int));
186extern tree type_for_size                       PROTO((unsigned, int));
187
188/* in c-convert.c */
189extern tree convert                             PROTO((tree, tree));
190
191/* in c-decl.c */
192/* Standard named or nameless data types of the C compiler.  */
193extern tree char_array_type_node;
194extern tree char_type_node;
195extern tree const_ptr_type_node;
196extern tree const_string_type_node;
197extern tree default_function_type;
198extern tree double_ftype_double;
199extern tree double_ftype_double_double;
200extern tree double_type_node;
201extern tree float_type_node;
202extern tree intDI_type_node;
203extern tree intHI_type_node;
204extern tree intQI_type_node;
205extern tree intSI_type_node;
206extern tree int_array_type_node;
207extern tree int_ftype_cptr_cptr_sizet;
208extern tree int_ftype_int;
209extern tree int_ftype_ptr_ptr_int;
210extern tree int_ftype_string_string;
211extern tree integer_type_node;
212extern tree long_double_type_node;
213extern tree long_ftype_long;
214extern tree long_integer_type_node;
215extern tree long_long_integer_type_node;
216extern tree long_long_unsigned_type_node;
217extern tree long_unsigned_type_node;
218extern tree complex_integer_type_node;
219extern tree complex_float_type_node;
220extern tree complex_double_type_node;
221extern tree complex_long_double_type_node;
222extern tree ptr_type_node;
223extern tree ptrdiff_type_node;
224extern tree short_integer_type_node;
225extern tree short_unsigned_type_node;
226extern tree signed_char_type_node;
227extern tree signed_wchar_type_node;
228extern tree string_ftype_ptr_ptr;
229extern tree string_type_node;
230extern tree unsigned_char_type_node;
231extern tree unsigned_intDI_type_node;
232extern tree unsigned_intHI_type_node;
233extern tree unsigned_intQI_type_node;
234extern tree unsigned_intSI_type_node;
235extern tree unsigned_type_node;
236extern tree unsigned_wchar_type_node;
237extern tree void_ftype_ptr_int_int;
238extern tree void_ftype_ptr_ptr_int;
239extern tree void_type_node;
240extern tree wchar_array_type_node;
241extern tree wchar_type_node;
242extern tree boolean_type_node;
243extern tree boolean_true_node;
244extern tree boolean_false_node;
245
246extern tree build_enumerator                    PROTO((tree, tree));
247/* Declare a predefined function.  Return the declaration.  */
248extern tree builtin_function                    PROTO((char *, tree, enum built_in_function function_, char *));
249/* Add qualifiers to a type, in the fashion for C.  */
250extern tree c_build_type_variant                PROTO((tree, int, int));
251extern int  c_decode_option                     PROTO((char *));
252extern void c_mark_varargs                      PROTO((void));
253extern tree check_identifier                    PROTO((tree, tree));
254extern void clear_parm_order                    PROTO((void));
255extern tree combine_parm_decls                  PROTO((tree, tree, int));
256extern int  complete_array_type                 PROTO((tree, tree, int));
257extern void declare_parm_level                  PROTO((int));
258extern tree define_label                        PROTO((char *, int, tree));
259extern void delete_block                        PROTO((tree));
260extern void finish_decl                         PROTO((tree, tree, tree));
261extern void finish_decl_top_level               PROTO((tree, tree, tree));
262extern tree finish_enum                         PROTO((tree, tree, tree));
263extern void finish_function                     PROTO((int));
264extern tree finish_struct                       PROTO((tree, tree, tree));
265extern tree get_parm_info                       PROTO((int));
266extern tree getdecls                            PROTO((void));
267extern tree gettags                             PROTO((void));
268extern int  global_bindings_p                   PROTO((void));
269extern tree grokfield                           PROTO((char *, int, tree, tree, tree));
270extern tree groktypename                        PROTO((tree));
271extern tree groktypename_in_parm_context        PROTO((tree));
272extern tree implicitly_declare                  PROTO((tree));
273extern int  in_parm_level_p                     PROTO((void));
274extern void init_decl_processing                PROTO((void));
275extern void insert_block                        PROTO((tree));
276extern void keep_next_level                     PROTO((void));
277extern int  kept_level_p                        PROTO((void));
278extern tree lookup_label                        PROTO((tree));
279extern tree lookup_name                         PROTO((tree));
280extern tree lookup_name_current_level           PROTO((tree));
281extern tree lookup_name_current_level_global    PROTO((tree));
282extern tree maybe_build_cleanup                 PROTO((tree));
283extern void parmlist_tags_warning               PROTO((void));
284extern void pending_xref_error                  PROTO((void));
285extern void pop_c_function_context              PROTO((void));
286extern void pop_label_level                     PROTO((void));
287extern tree poplevel                            PROTO((int, int, int));
288extern void print_lang_decl                     STDIO_PROTO((FILE *, tree,
289                                                             int));
290extern void print_lang_identifier               STDIO_PROTO((FILE *, tree,
291                                                             int));
292extern void print_lang_type                     STDIO_PROTO((FILE *, tree,
293                                                             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 `$' can be in an identifier.  */
386
387extern int dollars_in_ident;
388
389/* Nonzero means allow type mismatches in conditional expressions;
390   just make their values `void'.   */
391
392extern int flag_cond_mismatch;
393
394/* Nonzero means don't recognize the keyword `asm'.  */
395
396extern int flag_no_asm;
397
398/* Nonzero means ignore `#ident' directives.  */
399
400extern int flag_no_ident;
401
402/* Nonzero means warn about implicit declarations.  */
403
404extern int warn_implicit;
405
406/* Nonzero means give string constants the type `const char *'
407   to get extra warnings from them.  These warnings will be too numerous
408   to be useful, except in thoroughly ANSIfied programs.  */
409
410extern int warn_write_strings;
411
412/* Nonzero means warn about sizeof (function) or addition/subtraction
413   of function pointers.  */
414
415extern int warn_pointer_arith;
416
417/* Nonzero means warn for all old-style non-prototype function decls.  */
418
419extern int warn_strict_prototypes;
420
421/* Nonzero means warn about multiple (redundant) decls for the same single
422   variable or function.  */
423
424extern int warn_redundant_decls;
425
426/* Nonzero means warn about extern declarations of objects not at
427   file-scope level and about *all* declarations of functions (whether
428   extern or static) not at file-scope level.  Note that we exclude
429   implicit function declarations.  To get warnings about those, use
430   -Wimplicit.  */
431
432extern int warn_nested_externs;
433
434/* Nonzero means warn about pointer casts that can drop a type qualifier
435   from the pointer target type.  */
436
437extern int warn_cast_qual;
438
439/* Nonzero means warn when casting a function call to a type that does
440   not match the return type (e.g. (float)sqrt() or (anything*)malloc()
441   when there is no previous declaration of sqrt or malloc.  */
442
443extern int warn_bad_function_cast;
444
445/* Warn about traditional constructs whose meanings changed in ANSI C.  */
446
447extern int warn_traditional;
448
449/* Warn about *printf or *scanf format/argument anomalies. */
450
451extern int warn_format;
452
453/* Warn about a subscript that has type char.  */
454
455extern int warn_char_subscripts;
456
457/* Warn if a type conversion is done that might have confusing results.  */
458
459extern int warn_conversion;
460
461/* Nonzero means do some things the same way PCC does.  */
462
463extern int flag_traditional;
464
465/* Nonzero means to allow single precision math even if we're generally
466   being traditional. */
467extern int flag_allow_single_precision;
468
469/* Nonzero means warn about suggesting putting in ()'s.  */
470
471extern int warn_parentheses;
472
473/* Warn if initializer is not completely bracketed.  */
474
475extern int warn_missing_braces;
476
477/* Nonzero means this is a function to call to perform comptypes
478   on two record types.  */
479
480extern int (*comptypes_record_hook) ();
481
482/* Nonzero means we are reading code that came from a system header file.  */
483
484extern int system_header_p;
485
486/* Nonzero enables objc features.  */
487
488extern int doing_objc_thang;
489
490#endif /* not _C_TREE_H */
Note: See TracBrowser for help on using the repository browser.