source: trunk/third/gcc/gcc/c-common.h @ 18474

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1/* Definitions for c-common.c.
2   Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
3   1999, 2000, 2001, 2002 Free Software Foundation, Inc.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free
9Software Foundation; either version 2, or (at your option) any later
10version.
11
12GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or
14FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15for more details.
16
17You should have received a copy of the GNU General Public License
18along with GCC; see the file COPYING.  If not, write to the Free
19Software Foundation, 59 Temple Place - Suite 330, Boston, MA
2002111-1307, USA.  */
21
22#ifndef GCC_C_COMMON_H
23#define GCC_C_COMMON_H
24
25#include "splay-tree.h"
26#include "cpplib.h"
27
28/* Usage of TREE_LANG_FLAG_?:
29   0: COMPOUND_STMT_NO_SCOPE (in COMPOUND_STMT).
30      TREE_NEGATED_INT (in INTEGER_CST).
31      IDENTIFIER_MARKED (used by search routines).
32      SCOPE_BEGIN_P (in SCOPE_STMT)
33      DECL_PRETTY_FUNCTION_P (in VAR_DECL)
34      NEW_FOR_SCOPE_P (in FOR_STMT)
35      ASM_INPUT_P (in ASM_STMT)
36      STMT_EXPR_NO_SCOPE (in STMT_EXPR)
37   1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
38      STMT_IS_FULL_EXPR_P (in _STMT)
39   2: STMT_LINENO_FOR_FN_P (in _STMT)
40   3: SCOPE_NO_CLEANUPS_P (in SCOPE_STMT)
41      COMPOUND_STMT_BODY_BLOCK (in COMPOUND_STMT)
42   4: SCOPE_PARTIAL_P (in SCOPE_STMT)
43*/
44
45/* Reserved identifiers.  This is the union of all the keywords for C,
46   C++, and Objective C.  All the type modifiers have to be in one
47   block at the beginning, because they are used as mask bits.  There
48   are 27 type modifiers; if we add many more we will have to redesign
49   the mask mechanism.  */
50
51enum rid
52{
53  /* Modifiers: */
54  /* C, in empirical order of frequency.  */
55  RID_STATIC = 0,
56  RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
57  RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
58  RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
59
60  /* C extensions */
61  RID_BOUNDED, RID_UNBOUNDED, RID_COMPLEX,
62
63  /* C++ */
64  RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
65
66  /* ObjC */
67  RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
68
69  /* C */
70  RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
71  RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
72  RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
73  RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
74  RID_SIZEOF,
75
76  /* C extensions */
77  RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
78  RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_PTRBASE,
79  RID_PTREXTENT, RID_PTRVALUE, RID_CHOOSE_EXPR, RID_TYPES_COMPATIBLE_P,
80
81  /* Too many ways of getting the name of a function as a string */
82  RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
83
84  /* C++ */
85  RID_BOOL,     RID_WCHAR,    RID_CLASS,
86  RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
87  RID_TEMPLATE, RID_NULL,     RID_CATCH,
88  RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
89  RID_NEW,      RID_OPERATOR, RID_THIS,
90  RID_THROW,    RID_TRUE,     RID_TRY,
91  RID_TYPENAME, RID_TYPEID,   RID_USING,
92
93  /* casts */
94  RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
95
96  /* alternate spellings */
97  RID_AND, RID_AND_EQ, RID_NOT, RID_NOT_EQ,
98  RID_OR,  RID_OR_EQ,  RID_XOR, RID_XOR_EQ,
99  RID_BITAND, RID_BITOR, RID_COMPL,
100
101  /* Objective C */
102  RID_ID,          RID_AT_ENCODE,    RID_AT_END,
103  RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
104  RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
105  RID_AT_PROTOCOL, RID_AT_SELECTOR,  RID_AT_INTERFACE,
106  RID_AT_IMPLEMENTATION,
107
108  RID_MAX,
109
110  RID_FIRST_MODIFIER = RID_STATIC,
111  RID_LAST_MODIFIER = RID_ONEWAY,
112
113  RID_FIRST_AT = RID_AT_ENCODE,
114  RID_LAST_AT = RID_AT_IMPLEMENTATION,
115  RID_FIRST_PQ = RID_IN,
116  RID_LAST_PQ = RID_ONEWAY
117};
118
119#define OBJC_IS_AT_KEYWORD(rid) \
120  ((unsigned int)(rid) >= (unsigned int)RID_FIRST_AT && \
121   (unsigned int)(rid) <= (unsigned int)RID_LAST_AT)
122
123#define OBJC_IS_PQ_KEYWORD(rid) \
124  ((unsigned int)(rid) >= (unsigned int)RID_FIRST_PQ && \
125   (unsigned int)(rid) <= (unsigned int)RID_LAST_PQ)
126
127/* The elements of `ridpointers' are identifier nodes for the reserved
128   type names and storage classes.  It is indexed by a RID_... value.  */
129extern tree *ridpointers;
130
131/* Standard named or nameless data types of the C compiler.  */
132
133enum c_tree_index
134{
135    CTI_WCHAR_TYPE,
136    CTI_SIGNED_WCHAR_TYPE,
137    CTI_UNSIGNED_WCHAR_TYPE,
138    CTI_WINT_TYPE,
139    CTI_C_SIZE_TYPE, /* The type used for the size_t typedef and the
140                        result type of sizeof (an ordinary type without
141                        TYPE_IS_SIZETYPE set, unlike the internal
142                        sizetype).  */
143    CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
144    CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
145    CTI_INTMAX_TYPE,
146    CTI_UINTMAX_TYPE,
147    CTI_WIDEST_INT_LIT_TYPE,
148    CTI_WIDEST_UINT_LIT_TYPE,
149
150    CTI_CHAR_ARRAY_TYPE,
151    CTI_WCHAR_ARRAY_TYPE,
152    CTI_INT_ARRAY_TYPE,
153    CTI_STRING_TYPE,
154    CTI_CONST_STRING_TYPE,
155
156    /* Type for boolean expressions (bool in C++, int in C).  */
157    CTI_BOOLEAN_TYPE,
158    CTI_BOOLEAN_TRUE,
159    CTI_BOOLEAN_FALSE,
160    /* C99's _Bool type.  */
161    CTI_C_BOOL_TYPE,
162    CTI_C_BOOL_TRUE,
163    CTI_C_BOOL_FALSE,
164    CTI_DEFAULT_FUNCTION_TYPE,
165
166    CTI_G77_INTEGER_TYPE,
167    CTI_G77_UINTEGER_TYPE,
168    CTI_G77_LONGINT_TYPE,
169    CTI_G77_ULONGINT_TYPE,
170
171    /* These are not types, but we have to look them up all the time.  */
172    CTI_FUNCTION_NAME_DECL,
173    CTI_PRETTY_FUNCTION_NAME_DECL,
174    CTI_C99_FUNCTION_NAME_DECL,
175    CTI_SAVED_FUNCTION_NAME_DECLS,
176   
177    CTI_VOID_ZERO,
178
179    CTI_MAX
180};
181
182#define C_RID_CODE(id)  (((struct c_common_identifier *) (id))->node.rid_code)
183
184/* Identifier part common to the C front ends.  Inherits from
185   tree_identifier, despite appearances.  */
186struct c_common_identifier
187{
188  struct tree_common common;
189  struct cpp_hashnode node;
190};
191
192#define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
193#define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
194#define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
195#define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
196#define c_size_type_node                c_global_trees[CTI_C_SIZE_TYPE]
197#define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
198#define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
199#define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
200#define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
201#define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
202#define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
203
204#define boolean_type_node               c_global_trees[CTI_BOOLEAN_TYPE]
205#define boolean_true_node               c_global_trees[CTI_BOOLEAN_TRUE]
206#define boolean_false_node              c_global_trees[CTI_BOOLEAN_FALSE]
207
208#define c_bool_type_node                c_global_trees[CTI_C_BOOL_TYPE]
209#define c_bool_true_node                c_global_trees[CTI_C_BOOL_TRUE]
210#define c_bool_false_node               c_global_trees[CTI_C_BOOL_FALSE]
211
212#define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
213#define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
214#define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
215#define string_type_node                c_global_trees[CTI_STRING_TYPE]
216#define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
217
218#define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
219
220/* g77 integer types, which which must be kept in sync with f/com.h */
221#define g77_integer_type_node           c_global_trees[CTI_G77_INTEGER_TYPE]
222#define g77_uinteger_type_node          c_global_trees[CTI_G77_UINTEGER_TYPE]
223#define g77_longint_type_node           c_global_trees[CTI_G77_LONGINT_TYPE]
224#define g77_ulongint_type_node          c_global_trees[CTI_G77_ULONGINT_TYPE]
225
226#define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
227#define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
228#define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
229#define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
230
231/* A node for `((void) 0)'.  */
232#define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
233
234extern tree c_global_trees[CTI_MAX];
235
236/* Mark which labels are explicitly declared.
237   These may be shadowed, and may be referenced from nested functions.  */
238#define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
239
240/* Flag strings given by __FUNCTION__ and __PRETTY_FUNCTION__ for a
241   warning if they undergo concatenation.  */
242#define C_ARTIFICIAL_STRING_P(NODE) TREE_LANG_FLAG_0 (NODE)
243
244typedef enum c_language_kind
245{
246  clk_c,           /* A dialect of C: K&R C, ANSI/ISO C89, C2000,
247                       etc.  */
248  clk_cplusplus,   /* ANSI/ISO C++ */
249  clk_objective_c  /* Objective C */
250}
251c_language_kind;
252
253/* Information about a statement tree.  */
254
255struct stmt_tree_s {
256  /* The last statement added to the tree.  */
257  tree x_last_stmt;
258  /* The type of the last expression statement.  (This information is
259     needed to implement the statement-expression extension.)  */
260  tree x_last_expr_type;
261  /* The last filename we recorded.  */
262  const char *x_last_expr_filename;
263  /* In C++, Non-zero if we should treat statements as full
264     expressions.  In particular, this variable is no-zero if at the
265     end of a statement we should destroy any temporaries created
266     during that statement.  Similarly, if, at the end of a block, we
267     should destroy any local variables in this block.  Normally, this
268     variable is non-zero, since those are the normal semantics of
269     C++.
270
271     However, in order to represent aggregate initialization code as
272     tree structure, we use statement-expressions.  The statements
273     within the statement expression should not result in cleanups
274     being run until the entire enclosing statement is complete.
275
276     This flag has no effect in C.  */
277  int stmts_are_full_exprs_p;
278};
279
280typedef struct stmt_tree_s *stmt_tree;
281
282/* Global state pertinent to the current function.  Some C dialects
283   extend this structure with additional fields.  */
284
285struct language_function {
286  /* While we are parsing the function, this contains information
287     about the statement-tree that we are building.  */
288  struct stmt_tree_s x_stmt_tree;
289  /* The stack of SCOPE_STMTs for the current function.  */
290  tree x_scope_stmt_stack;
291};
292
293/* When building a statement-tree, this is the last statement added to
294   the tree.  */
295
296#define last_tree (current_stmt_tree ()->x_last_stmt)
297
298/* The type of the last expression-statement we have seen.  */
299
300#define last_expr_type (current_stmt_tree ()->x_last_expr_type)
301
302/* The name of the last file we have seen.  */
303
304#define last_expr_filename (current_stmt_tree ()->x_last_expr_filename)
305
306/* LAST_TREE contains the last statement parsed.  These are chained
307   together through the TREE_CHAIN field, but often need to be
308   re-organized since the parse is performed bottom-up.  This macro
309   makes LAST_TREE the indicated SUBSTMT of STMT.  */
310
311#define RECHAIN_STMTS(stmt, substmt)            \
312  do {                                          \
313    substmt = TREE_CHAIN (stmt);                \
314    TREE_CHAIN (stmt) = NULL_TREE;              \
315    last_tree = stmt;                           \
316  } while (0)
317
318/* Language-specific hooks.  */
319
320extern int (*lang_statement_code_p)             PARAMS ((enum tree_code));
321extern void (*lang_expand_stmt)                 PARAMS ((tree));
322extern void (*lang_expand_decl_stmt)            PARAMS ((tree));
323extern void (*lang_expand_function_end)         PARAMS ((void));
324
325/* Callback that determines if it's ok for a function to have no
326   noreturn attribute.  */
327extern int (*lang_missing_noreturn_ok_p)        PARAMS ((tree));
328
329
330extern stmt_tree current_stmt_tree              PARAMS ((void));
331extern tree *current_scope_stmt_stack           PARAMS ((void));
332extern void begin_stmt_tree                     PARAMS ((tree *));
333extern tree add_stmt                            PARAMS ((tree));
334extern void add_decl_stmt                       PARAMS ((tree));
335extern tree add_scope_stmt                      PARAMS ((int, int));
336extern void finish_stmt_tree                    PARAMS ((tree *));
337
338extern int statement_code_p                     PARAMS ((enum tree_code));
339extern tree walk_stmt_tree                      PARAMS ((tree *,
340                                                         walk_tree_fn,
341                                                         void *));
342extern void prep_stmt                           PARAMS ((tree));
343extern void expand_stmt                         PARAMS ((tree));
344extern void mark_stmt_tree                      PARAMS ((void *));
345extern void shadow_warning                      PARAMS ((const char *,
346                                                         tree, tree));
347extern tree c_begin_if_stmt                     PARAMS ((void));
348extern tree c_begin_while_stmt                  PARAMS ((void));
349extern void c_finish_while_stmt_cond            PARAMS ((tree, tree));
350
351
352/* Extra information associated with a DECL.  Other C dialects extend
353   this structure in various ways.  The C front-end only uses this
354   structure for FUNCTION_DECLs; all other DECLs have a NULL
355   DECL_LANG_SPECIFIC field.  */
356
357struct c_lang_decl {
358  unsigned declared_inline : 1;
359};
360
361/* In a FUNCTION_DECL for which DECL_BUILT_IN does not hold, this is
362     the approximate number of statements in this function.  There is
363     no need for this number to be exact; it is only used in various
364     heuristics regarding optimization.  */
365#define DECL_NUM_STMTS(NODE) \
366  (FUNCTION_DECL_CHECK (NODE)->decl.u1.i)
367
368extern void c_mark_lang_decl                    PARAMS ((struct c_lang_decl *));
369
370/* The variant of the C language being processed.  Each C language
371   front-end defines this variable.  */
372
373extern c_language_kind c_language;
374
375/* Nonzero means give string constants the type `const char *', rather
376   than `char *'.  */
377
378extern int flag_const_strings;
379
380/* Nonzero means give `double' the same size as `float'.  */
381
382extern int flag_short_double;
383
384/* Nonzero means give `wchar_t' the same size as `short'.  */
385
386extern int flag_short_wchar;
387
388/* Warn about *printf or *scanf format/argument anomalies.  */
389
390extern int warn_format;
391
392/* Warn about Y2K problems with strftime formats.  */
393
394extern int warn_format_y2k;
395
396/* Warn about excess arguments to formats.  */
397
398extern int warn_format_extra_args;
399
400/* Warn about non-literal format arguments.  */
401
402extern int warn_format_nonliteral;
403
404/* Warn about possible security problems with calls to format functions.  */
405
406extern int warn_format_security;
407
408/* Warn about possible violations of sequence point rules.  */
409
410extern int warn_sequence_point;
411
412/* Warn about functions which might be candidates for format attributes.  */
413
414extern int warn_missing_format_attribute;
415
416/* Nonzero means warn about sizeof (function) or addition/subtraction
417   of function pointers.  */
418
419extern int warn_pointer_arith;
420
421/* Nonzero means to warn about compile-time division by zero.  */
422extern int warn_div_by_zero;
423
424/* Nonzero means do some things the same way PCC does.  */
425
426extern int flag_traditional;
427
428/* Nonzero means enable C89 Amendment 1 features.  */
429
430extern int flag_isoc94;
431
432/* Nonzero means use the ISO C99 dialect of C.  */
433
434extern int flag_isoc99;
435
436/* Nonzero means environment is hosted (i.e., not freestanding) */
437
438extern int flag_hosted;
439
440/* Nonzero means add default format_arg attributes for functions not
441   in ISO C.  */
442
443extern int flag_noniso_default_format_attributes;
444
445/* Nonzero means don't recognize any builtin functions.  */
446
447extern int flag_no_builtin;
448
449/* Nonzero means don't recognize the non-ANSI builtin functions.
450   -ansi sets this.  */
451
452extern int flag_no_nonansi_builtin;
453
454/* Nonzero means warn about suggesting putting in ()'s.  */
455
456extern int warn_parentheses;
457
458/* Warn if a type conversion is done that might have confusing results.  */
459
460extern int warn_conversion;
461
462/* Nonzero means warn about usage of long long,
463   when `-pedantic' and not C99.  */
464
465extern int warn_long_long;
466
467/* Nonzero means the expression being parsed will never be evaluated.
468   This is a count, since unevaluated expressions can nest.  */
469
470extern int skip_evaluation;
471
472/* C types are partitioned into three subsets: object, function, and
473   incomplete types.  */
474#define C_TYPE_OBJECT_P(type) \
475  (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
476
477#define C_TYPE_INCOMPLETE_P(type) \
478  (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
479
480#define C_TYPE_FUNCTION_P(type) \
481  (TREE_CODE (type) == FUNCTION_TYPE)
482
483/* For convenience we define a single macro to identify the class of
484   object or incomplete types.  */
485#define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
486  (!C_TYPE_FUNCTION_P (type))
487
488/* Record in each node resulting from a binary operator
489   what operator was specified for it.  */
490#define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
491
492/* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
493   ID is the identifier to use, NAME is the string.
494   TYPE_DEP indicates whether it depends on type of the function or not
495   (i.e. __PRETTY_FUNCTION__).  */
496
497extern tree (*make_fname_decl)                  PARAMS ((tree, int));
498
499extern tree identifier_global_value             PARAMS ((tree));
500extern void record_builtin_type                 PARAMS ((enum rid,
501                                                         const char *, tree));
502extern tree build_void_list_node                PARAMS ((void));
503extern void start_fname_decls                   PARAMS ((void));
504extern void finish_fname_decls                  PARAMS ((void));
505extern const char *fname_as_string              PARAMS ((int));
506extern tree fname_decl                          PARAMS ((unsigned, tree));
507extern const char *fname_string                 PARAMS ((unsigned));
508
509extern void check_function_format               PARAMS ((int *, tree, tree));
510extern void set_Wformat                         PARAMS ((int));
511extern tree handle_format_attribute             PARAMS ((tree *, tree, tree,
512                                                         int, bool *));
513extern tree handle_format_arg_attribute         PARAMS ((tree *, tree, tree,
514                                                         int, bool *));
515extern void c_common_insert_default_attributes  PARAMS ((tree));
516extern void c_apply_type_quals_to_decl          PARAMS ((int, tree));
517extern tree c_sizeof                            PARAMS ((tree));
518extern tree c_alignof                           PARAMS ((tree));
519extern tree c_alignof_expr                      PARAMS ((tree));
520/* Print an error message for invalid operands to arith operation CODE.
521   NOP_EXPR is used as a special case (see truthvalue_conversion).  */
522extern void binary_op_error                     PARAMS ((enum tree_code));
523extern tree c_expand_expr_stmt                  PARAMS ((tree));
524extern void c_expand_start_cond                 PARAMS ((tree, int, tree));
525extern void c_finish_then                       PARAMS ((void));
526extern void c_expand_start_else                 PARAMS ((void));
527extern void c_finish_else                   PARAMS ((void));
528extern void c_expand_end_cond                   PARAMS ((void));
529/* Validate the expression after `case' and apply default promotions.  */
530extern tree check_case_value                    PARAMS ((tree));
531/* Concatenate a list of STRING_CST nodes into one STRING_CST.  */
532extern tree combine_strings                     PARAMS ((tree));
533extern void constant_expression_warning         PARAMS ((tree));
534extern tree convert_and_check                   PARAMS ((tree, tree));
535extern void overflow_warning                    PARAMS ((tree));
536extern void unsigned_conversion_warning         PARAMS ((tree, tree));
537
538/* Read the rest of the current #-directive line.  */
539extern char *get_directive_line                 PARAMS ((void));
540#define GET_DIRECTIVE_LINE() get_directive_line ()
541
542/* Subroutine of build_binary_op, used for comparison operations.
543   See if the operands have both been converted from subword integer types
544   and, if so, perhaps change them both back to their original type.  */
545extern tree shorten_compare                     PARAMS ((tree *, tree *, tree *, enum tree_code *));
546
547extern tree pointer_int_sum                     PARAMS ((enum tree_code, tree, tree));
548extern unsigned int min_precision               PARAMS ((tree, int));
549
550/* Add qualifiers to a type, in the fashion for C.  */
551extern tree c_build_qualified_type              PARAMS ((tree, int));
552
553/* Build tree nodes and builtin functions common to both C and C++ language
554   frontends.  */
555extern void c_common_nodes_and_builtins         PARAMS ((void));
556
557extern void disable_builtin_function            PARAMS ((const char *));
558
559extern tree build_va_arg                        PARAMS ((tree, tree));
560
561extern void c_common_init_options               PARAMS ((enum c_language_kind));
562extern void c_common_post_options               PARAMS ((void));
563extern const char *c_common_init                PARAMS ((const char *));
564extern void c_common_finish                     PARAMS ((void));
565extern HOST_WIDE_INT c_common_get_alias_set     PARAMS ((tree));
566extern bool c_promoting_integer_type_p          PARAMS ((tree));
567extern int self_promoting_args_p                PARAMS ((tree));
568extern tree simple_type_promotes_to             PARAMS ((tree));
569extern tree strip_array_types                   PARAMS ((tree));
570
571/* These macros provide convenient access to the various _STMT nodes.  */
572
573/* Nonzero if this statement should be considered a full-expression,
574   i.e., if temporaries created during this statement should have
575   their destructors run at the end of this statement.  (In C, this
576   will always be false, since there are no destructors.)  */
577#define STMT_IS_FULL_EXPR_P(NODE) TREE_LANG_FLAG_1 ((NODE))
578
579/* IF_STMT accessors. These give access to the condition of the if
580   statement, the then block of the if statement, and the else block
581   of the if statement if it exists.  */
582#define IF_COND(NODE)           TREE_OPERAND (IF_STMT_CHECK (NODE), 0)
583#define THEN_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 1)
584#define ELSE_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 2)
585
586/* WHILE_STMT accessors. These give access to the condition of the
587   while statement and the body of the while statement, respectively.  */
588#define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
589#define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
590
591/* DO_STMT accessors. These give access to the condition of the do
592   statement and the body of the do statement, respectively.  */
593#define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
594#define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
595
596/* RETURN_STMT accessors. These give the expression associated with a
597   return statement, and whether it should be ignored when expanding
598   (as opposed to inlining).  */
599#define RETURN_EXPR(NODE)       TREE_OPERAND (RETURN_STMT_CHECK (NODE), 0)
600
601/* EXPR_STMT accessor. This gives the expression associated with an
602   expression statement.  */
603#define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
604
605/* FOR_STMT accessors. These give access to the init statement,
606   condition, update expression, and body of the for statement,
607   respectively.  */
608#define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
609#define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
610#define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
611#define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
612
613/* SWITCH_STMT accessors. These give access to the condition, body and
614   original condition type (before any compiler conversions)
615   of the switch statement, respectively.  */
616#define SWITCH_COND(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 0)
617#define SWITCH_BODY(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 1)
618#define SWITCH_TYPE(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 2)
619
620/* CASE_LABEL accessors. These give access to the high and low values
621   of a case label, respectively.  */
622#define CASE_LOW(NODE)          TREE_OPERAND (CASE_LABEL_CHECK (NODE), 0)
623#define CASE_HIGH(NODE)         TREE_OPERAND (CASE_LABEL_CHECK (NODE), 1)
624#define CASE_LABEL_DECL(NODE)   TREE_OPERAND (CASE_LABEL_CHECK (NODE), 2)
625
626/* GOTO_STMT accessor. This gives access to the label associated with
627   a goto statement.  */
628#define GOTO_DESTINATION(NODE)  TREE_OPERAND (GOTO_STMT_CHECK (NODE), 0)
629/* True for goto created artifically by the compiler.  */
630#define GOTO_FAKE_P(NODE)       (TREE_LANG_FLAG_0 (GOTO_STMT_CHECK (NODE)))
631
632/* COMPOUND_STMT accessor. This gives access to the TREE_LIST of
633   statements associated with a compound statement. The result is the
634   first statement in the list. Succeeding nodes can be accessed by
635   calling TREE_CHAIN on a node in the list.  */
636#define COMPOUND_BODY(NODE)     TREE_OPERAND (COMPOUND_STMT_CHECK (NODE), 0)
637
638/* ASM_STMT accessors. ASM_STRING returns a STRING_CST for the
639   instruction (e.g., "mov x, y"). ASM_OUTPUTS, ASM_INPUTS, and
640   ASM_CLOBBERS represent the outputs, inputs, and clobbers for the
641   statement.  */
642#define ASM_CV_QUAL(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 0)
643#define ASM_STRING(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 1)
644#define ASM_OUTPUTS(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 2)
645#define ASM_INPUTS(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 3)
646#define ASM_CLOBBERS(NODE)      TREE_OPERAND (ASM_STMT_CHECK (NODE), 4)
647
648/* DECL_STMT accessor. This gives access to the DECL associated with
649   the given declaration statement.  */
650#define DECL_STMT_DECL(NODE)    TREE_OPERAND (DECL_STMT_CHECK (NODE), 0)
651
652/* STMT_EXPR accessor.  */
653#define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
654
655/* Nonzero if this statement-expression does not have an associated scope.  */
656#define STMT_EXPR_NO_SCOPE(NODE) \
657   TREE_LANG_FLAG_0 (STMT_EXPR_CHECK (NODE))
658
659/* LABEL_STMT accessor. This gives access to the label associated with
660   the given label statement.  */
661#define LABEL_STMT_LABEL(NODE)  TREE_OPERAND (LABEL_STMT_CHECK (NODE), 0)
662
663/* COMPOUND_LITERAL_EXPR accessors.  */
664#define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
665  TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
666#define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
667  DECL_STMT_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
668
669/* Nonzero if this SCOPE_STMT is for the beginning of a scope.  */
670#define SCOPE_BEGIN_P(NODE) \
671  (TREE_LANG_FLAG_0 (SCOPE_STMT_CHECK (NODE)))
672
673/* Nonzero if this SCOPE_STMT is for the end of a scope.  */
674#define SCOPE_END_P(NODE) \
675  (!SCOPE_BEGIN_P (SCOPE_STMT_CHECK (NODE)))
676
677/* The BLOCK containing the declarations contained in this scope.  */
678#define SCOPE_STMT_BLOCK(NODE) \
679  (TREE_OPERAND (SCOPE_STMT_CHECK (NODE), 0))
680
681/* Nonzero for a SCOPE_STMT if there were no variables in this scope.  */
682#define SCOPE_NULLIFIED_P(NODE) \
683  (SCOPE_STMT_BLOCK ((NODE)) == NULL_TREE)
684
685/* Nonzero for a SCOPE_STMT which represents a lexical scope, but
686   which should be treated as non-existent from the point of view of
687   running cleanup actions.  */
688#define SCOPE_NO_CLEANUPS_P(NODE) \
689  (TREE_LANG_FLAG_3 (SCOPE_STMT_CHECK (NODE)))
690
691/* Nonzero for a SCOPE_STMT if this statement is for a partial scope.
692   For example, in:
693
694     S s;
695     l:
696     S s2;
697     goto l;
698
699   there is (implicitly) a new scope after `l', even though there are
700   no curly braces.  In particular, when we hit the goto, we must
701   destroy s2 and then re-construct it.  For the implicit scope,
702   SCOPE_PARTIAL_P will be set.  */
703#define SCOPE_PARTIAL_P(NODE) \
704  (TREE_LANG_FLAG_4 (SCOPE_STMT_CHECK (NODE)))
705
706/* Nonzero for an ASM_STMT if the assembly statement is volatile.  */
707#define ASM_VOLATILE_P(NODE)                    \
708  (ASM_CV_QUAL (ASM_STMT_CHECK (NODE)) != NULL_TREE)
709
710/* The VAR_DECL to clean up in a CLEANUP_STMT.  */
711#define CLEANUP_DECL(NODE) \
712  TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 0)
713/* The cleanup to run in a CLEANUP_STMT.  */
714#define CLEANUP_EXPR(NODE) \
715  TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 1)
716
717/* The filename we are changing to as of this FILE_STMT.  */
718#define FILE_STMT_FILENAME_NODE(NODE) \
719  (TREE_OPERAND (FILE_STMT_CHECK (NODE), 0))
720#define FILE_STMT_FILENAME(NODE) \
721  (IDENTIFIER_POINTER (FILE_STMT_FILENAME_NODE (NODE)))
722
723/* The line-number at which a statement began.  But if
724   STMT_LINENO_FOR_FN_P does holds, then this macro gives the
725   line number for the end of the current function instead.  */
726#define STMT_LINENO(NODE)                       \
727  (TREE_COMPLEXITY ((NODE)))
728
729/* If non-zero, the STMT_LINENO for NODE is the line at which the
730   function ended.  */
731#define STMT_LINENO_FOR_FN_P(NODE)              \
732  (TREE_LANG_FLAG_2 ((NODE)))
733
734/* Nonzero if we want the new ISO rules for pushing a new scope for `for'
735   initialization variables.  */
736#define NEW_FOR_SCOPE_P(NODE) (TREE_LANG_FLAG_0 (NODE))
737
738/* Nonzero if we want to create an ASM_INPUT instead of an
739   ASM_OPERAND with no operands.  */
740#define ASM_INPUT_P(NODE) (TREE_LANG_FLAG_0 (NODE))
741
742#define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
743
744enum c_tree_code {
745  C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
746#include "c-common.def"
747  LAST_C_TREE_CODE
748};
749
750#undef DEFTREECODE
751
752extern void add_c_tree_codes                    PARAMS ((void));
753extern void genrtl_do_pushlevel                 PARAMS ((void));
754extern void genrtl_goto_stmt                    PARAMS ((tree));
755extern void genrtl_expr_stmt                    PARAMS ((tree));
756extern void genrtl_expr_stmt_value              PARAMS ((tree, int, int));
757extern void genrtl_decl_stmt                    PARAMS ((tree));
758extern void genrtl_if_stmt                      PARAMS ((tree));
759extern void genrtl_while_stmt                   PARAMS ((tree));
760extern void genrtl_do_stmt                      PARAMS ((tree));
761extern void genrtl_return_stmt                  PARAMS ((tree));
762extern void genrtl_for_stmt                     PARAMS ((tree));
763extern void genrtl_break_stmt                   PARAMS ((void));
764extern void genrtl_continue_stmt                PARAMS ((void));
765extern void genrtl_scope_stmt                   PARAMS ((tree));
766extern void genrtl_switch_stmt                  PARAMS ((tree));
767extern void genrtl_case_label                   PARAMS ((tree));
768extern void genrtl_compound_stmt                PARAMS ((tree));
769extern void genrtl_asm_stmt                     PARAMS ((tree, tree,
770                                                         tree, tree,
771                                                         tree, int));
772extern void genrtl_decl_cleanup                 PARAMS ((tree));
773extern int stmts_are_full_exprs_p               PARAMS ((void));
774extern int anon_aggr_type_p                     PARAMS ((tree));
775
776/* For a VAR_DECL that is an anonymous union, these are the various
777   sub-variables that make up the anonymous union.  */
778#define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
779
780/* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
781#define DECL_C_BIT_FIELD(NODE) \
782  (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
783#define SET_DECL_C_BIT_FIELD(NODE) \
784  (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
785#define CLEAR_DECL_C_BIT_FIELD(NODE) \
786  (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
787
788/* In a VAR_DECL, nonzero if the decl is a register variable with
789   an explicit asm specification.  */
790#define DECL_C_HARD_REGISTER(DECL)  DECL_LANG_FLAG_4 (VAR_DECL_CHECK (DECL))
791
792extern void emit_local_var                      PARAMS ((tree));
793extern void make_rtl_for_local_static           PARAMS ((tree));
794extern tree expand_cond                         PARAMS ((tree));
795extern tree c_expand_return                     PARAMS ((tree));
796extern tree do_case                             PARAMS ((tree, tree));
797extern tree build_stmt                          PARAMS ((enum tree_code, ...));
798extern tree build_case_label                    PARAMS ((tree, tree, tree));
799extern tree build_continue_stmt                 PARAMS ((void));
800extern tree build_break_stmt                    PARAMS ((void));
801extern tree build_return_stmt                   PARAMS ((tree));
802
803#define COMPOUND_STMT_NO_SCOPE(NODE)    TREE_LANG_FLAG_0 (NODE)
804
805/* Used by the C++ frontend to mark the block around the member
806   initializers and cleanups.  */
807#define COMPOUND_STMT_BODY_BLOCK(NODE)  TREE_LANG_FLAG_3 (NODE)
808
809extern void c_expand_asm_operands               PARAMS ((tree, tree, tree, tree, int, const char *, int));
810
811/* These functions must be defined by each front-end which implements
812   a variant of the C language.  They are used in c-common.c.  */
813
814extern tree build_unary_op                      PARAMS ((enum tree_code,
815                                                         tree, int));
816extern tree build_binary_op                     PARAMS ((enum tree_code,
817                                                         tree, tree, int));
818extern int lvalue_p                             PARAMS ((tree));
819extern tree default_conversion                  PARAMS ((tree));
820
821/* Given two integer or real types, return the type for their sum.
822   Given two compatible ANSI C types, returns the merged type.  */
823
824extern tree common_type                         PARAMS ((tree, tree));
825
826extern tree expand_tree_builtin                 PARAMS ((tree, tree, tree));
827
828extern tree decl_constant_value         PARAMS ((tree));
829
830/* Handle increment and decrement of boolean types.  */
831extern tree boolean_increment                   PARAMS ((enum tree_code,
832                                                         tree));
833
834/* Hook currently used only by the C++ front end to reset internal state
835   after entering or leaving a header file.  */
836extern void extract_interface_info              PARAMS ((void));
837
838extern void mark_c_language_function            PARAMS ((struct language_function *));
839
840extern int case_compare                         PARAMS ((splay_tree_key,
841                                                         splay_tree_key));
842
843extern tree c_add_case_label                    PARAMS ((splay_tree,
844                                                         tree, tree,
845                                                         tree));
846
847extern tree build_function_call                 PARAMS ((tree, tree));
848
849extern tree finish_label_address_expr           PARAMS ((tree));
850
851/* Same function prototype, but the C and C++ front ends have
852   different implementations.  Used in c-common.c.  */
853extern tree lookup_label                        PARAMS ((tree));
854
855/* enum expand_modified is in expr.h, as is the macro below.  */
856
857#ifdef QUEUED_VAR
858extern rtx c_expand_expr            PARAMS ((tree, rtx, enum machine_mode,
859                                             enum expand_modifier));
860#endif
861
862extern int c_safe_from_p                        PARAMS ((rtx, tree));
863
864extern int c_staticp                            PARAMS ((tree));
865
866extern int c_unsafe_for_reeval                  PARAMS ((tree));
867
868/* Information recorded about each file examined during compilation.  */
869
870struct c_fileinfo
871{
872  int time;     /* Time spent in the file.  */
873  short interface_only;         /* Flags - used only by C++ */
874  short interface_unknown;
875};
876
877struct c_fileinfo *get_fileinfo                 PARAMS ((const char *));
878extern void dump_time_statistics                PARAMS ((void));
879
880#endif /* ! GCC_C_COMMON_H */
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