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[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [gcc/] [langhooks.h] - Blame information for rev 859

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1 280 jeremybenn
/* The lang_hooks data structure.
2
   Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
3
   Free Software Foundation, Inc.
4
 
5
This file is part of GCC.
6
 
7
GCC is free software; you can redistribute it and/or modify
8
it under the terms of the GNU General Public License as published by
9
the Free Software Foundation; either version 3, or (at your option)
10
any later version.
11
 
12
GCC is distributed in the hope that it will be useful,
13
but WITHOUT ANY WARRANTY; without even the implied warranty of
14
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15
GNU General Public License for more details.
16
 
17
You should have received a copy of the GNU General Public License
18
along with GCC; see the file COPYING3.  If not see
19
<http://www.gnu.org/licenses/>.  */
20
 
21
#ifndef GCC_LANG_HOOKS_H
22
#define GCC_LANG_HOOKS_H
23
 
24
/* This file should be #include-d after tree.h.  */
25
 
26
struct diagnostic_context;
27
struct diagnostic_info;
28
 
29
struct gimplify_omp_ctx;
30
 
31
struct array_descr_info;
32
 
33
/* A print hook for print_tree ().  */
34
typedef void (*lang_print_tree_hook) (FILE *, tree, int indent);
35
 
36
enum classify_record
37
  { RECORD_IS_STRUCT, RECORD_IS_CLASS, RECORD_IS_INTERFACE };
38
 
39
/* The following hooks are documented in langhooks.c.  Must not be
40
   NULL.  */
41
 
42
struct lang_hooks_for_tree_inlining
43
{
44
  bool (*var_mod_type_p) (tree, tree);
45
};
46
 
47
struct lang_hooks_for_callgraph
48
{
49
  /* The node passed is a language-specific tree node.  If its contents
50
     are relevant to use of other declarations, mark them.  */
51
  tree (*analyze_expr) (tree *, int *);
52
};
53
 
54
/* The following hooks are used by tree-dump.c.  */
55
 
56
struct lang_hooks_for_tree_dump
57
{
58
  /* Dump language-specific parts of tree nodes.  Returns nonzero if it
59
     does not want the usual dumping of the second argument.  */
60
  bool (*dump_tree) (void *, tree);
61
 
62
  /* Determine type qualifiers in a language-specific way.  */
63
  int (*type_quals) (const_tree);
64
};
65
 
66
/* Hooks related to types.  */
67
 
68
struct lang_hooks_for_types
69
{
70
  /* Return a new type (with the indicated CODE), doing whatever
71
     language-specific processing is required.  */
72
  tree (*make_type) (enum tree_code);
73
 
74
  /* Return what kind of RECORD_TYPE this is, mainly for purposes of
75
     debug information.  If not defined, record types are assumed to
76
     be structures.  */
77
  enum classify_record (*classify_record) (tree);
78
 
79
  /* Given MODE and UNSIGNEDP, return a suitable type-tree with that
80
     mode.  */
81
  tree (*type_for_mode) (enum machine_mode, int);
82
 
83
  /* Given PRECISION and UNSIGNEDP, return a suitable type-tree for an
84
     integer type with at least that precision.  */
85
  tree (*type_for_size) (unsigned, int);
86
 
87
  /* True if the type is an instantiation of a generic type,
88
     e.g. C++ template implicit specializations.  */
89
  bool (*generic_p) (const_tree);
90
 
91
  /* Returns the TREE_VEC of elements of a given generic argument pack.  */
92
  tree (*get_argument_pack_elems) (const_tree);
93
 
94
  /* Given a type, apply default promotions to unnamed function
95
     arguments and return the new type.  Return the same type if no
96
     change.  Required by any language that supports variadic
97
     arguments.  The default hook dies.  */
98
  tree (*type_promotes_to) (tree);
99
 
100
  /* Register TYPE as a builtin type with the indicated NAME.  The
101
     TYPE is placed in the outermost lexical scope.  The semantics
102
     should be analogous to:
103
 
104
       typedef TYPE NAME;
105
 
106
     in C.  The default hook ignores the declaration.  */
107
  void (*register_builtin_type) (tree, const char *);
108
 
109
  /* This routine is called in tree.c to print an error message for
110
     invalid use of an incomplete type.  VALUE is the expression that
111
     was used (or 0 if that isn't known) and TYPE is the type that was
112
     invalid.  */
113
  void (*incomplete_type_error) (const_tree value, const_tree type);
114
 
115
  /* Called from assign_temp to return the maximum size, if there is one,
116
     for a type.  */
117
  tree (*max_size) (const_tree);
118
 
119
  /* Register language specific type size variables as potentially OpenMP
120
     firstprivate variables.  */
121
  void (*omp_firstprivatize_type_sizes) (struct gimplify_omp_ctx *, tree);
122
 
123
  /* Return TRUE if TYPE1 and TYPE2 are identical for type hashing purposes.
124
     Called only after doing all language independent checks.
125
     At present, this function is only called when both TYPE1 and TYPE2 are
126
     FUNCTION_TYPEs.  */
127
  bool (*type_hash_eq) (const_tree, const_tree);
128
 
129
  /* Return TRUE if TYPE uses a hidden descriptor and fills in information
130
     for the debugger about the array bounds, strides, etc.  */
131
  bool (*get_array_descr_info) (const_tree, struct array_descr_info *);
132
 
133
  /* Fill in information for the debugger about the bounds of TYPE.  */
134
  void (*get_subrange_bounds) (const_tree, tree *, tree *);
135
 
136
  /* If we requested a pointer to a vector, build up the pointers that
137
     we stripped off while looking for the inner type.  Similarly for
138
     return values from functions.  The argument TYPE is the top of the
139
     chain, and BOTTOM is the new type which we will point to.  */
140
  tree (*reconstruct_complex_type) (tree, tree);
141
 
142
  /* Nonzero if types that are identical are to be hashed so that only
143
     one copy is kept.  If a language requires unique types for each
144
     user-specified type, such as Ada, this should be set to TRUE.  */
145
  bool hash_types;
146
};
147
 
148
/* Language hooks related to decls and the symbol table.  */
149
 
150
struct lang_hooks_for_decls
151
{
152
  /* Returns nonzero if we are in the global binding level.  Ada
153
     returns -1 for an undocumented reason used in stor-layout.c.  */
154
  int (*global_bindings_p) (void);
155
 
156
  /* Function to add a decl to the current scope level.  Takes one
157
     argument, a decl to add.  Returns that decl, or, if the same
158
     symbol is already declared, may return a different decl for that
159
     name.  */
160
  tree (*pushdecl) (tree);
161
 
162
  /* Returns the chain of decls so far in the current scope level.  */
163
  tree (*getdecls) (void);
164
 
165
  /* Returns true if DECL is explicit member function.  */
166
  bool (*function_decl_explicit_p) (tree);
167
 
168
  /* Returns True if the parameter is a generic parameter decl
169
     of a generic type, e.g a template template parameter for the C++ FE.  */
170
  bool (*generic_generic_parameter_decl_p) (const_tree);
171
 
172
  /* Determine if a function parameter got expanded from a
173
     function parameter pack.  */
174
  bool (*function_parm_expanded_from_pack_p) (tree, tree);
175
 
176
  /* Returns the generic declaration of a generic function instantiations.  */
177
  tree (*get_generic_function_decl) (const_tree);
178
 
179
  /* Returns true when we should warn for an unused global DECL.
180
     We will already have checked that it has static binding.  */
181
  bool (*warn_unused_global) (const_tree);
182
 
183
  /* Obtain a list of globals and do final output on them at end
184
     of compilation */
185
  void (*final_write_globals) (void);
186
 
187
  /* True if this decl may be called via a sibcall.  */
188
  bool (*ok_for_sibcall) (const_tree);
189
 
190
  /* True if OpenMP should privatize what this DECL points to rather
191
     than the DECL itself.  */
192
  bool (*omp_privatize_by_reference) (const_tree);
193
 
194
  /* Return sharing kind if OpenMP sharing attribute of DECL is
195
     predetermined, OMP_CLAUSE_DEFAULT_UNSPECIFIED otherwise.  */
196
  enum omp_clause_default_kind (*omp_predetermined_sharing) (tree);
197
 
198
  /* Return decl that should be reported for DEFAULT(NONE) failure
199
     diagnostics.  Usually the DECL passed in.  */
200
  tree (*omp_report_decl) (tree);
201
 
202
  /* Return true if DECL's DECL_VALUE_EXPR (if any) should be
203
     disregarded in OpenMP construct, because it is going to be
204
     remapped during OpenMP lowering.  SHARED is true if DECL
205
     is going to be shared, false if it is going to be privatized.  */
206
  bool (*omp_disregard_value_expr) (tree, bool);
207
 
208
  /* Return true if DECL that is shared iff SHARED is true should
209
     be put into OMP_CLAUSE_PRIVATE_DEBUG.  */
210
  bool (*omp_private_debug_clause) (tree, bool);
211
 
212
  /* Return true if DECL in private clause needs
213
     OMP_CLAUSE_PRIVATE_OUTER_REF on the private clause.  */
214
  bool (*omp_private_outer_ref) (tree);
215
 
216
  /* Build and return code for a default constructor for DECL in
217
     response to CLAUSE.  OUTER is corresponding outer region's
218
     variable if needed.  Return NULL if nothing to be done.  */
219
  tree (*omp_clause_default_ctor) (tree clause, tree decl, tree outer);
220
 
221
  /* Build and return code for a copy constructor from SRC to DST.  */
222
  tree (*omp_clause_copy_ctor) (tree clause, tree dst, tree src);
223
 
224
  /* Similarly, except use an assignment operator instead.  */
225
  tree (*omp_clause_assign_op) (tree clause, tree dst, tree src);
226
 
227
  /* Build and return code destructing DECL.  Return NULL if nothing
228
     to be done.  */
229
  tree (*omp_clause_dtor) (tree clause, tree decl);
230
 
231
  /* Do language specific checking on an implicitly determined clause.  */
232
  void (*omp_finish_clause) (tree clause);
233
};
234
 
235
/* Language hooks related to LTO serialization.  */
236
 
237
struct lang_hooks_for_lto
238
{
239
  /* Begin a new LTO section named NAME.  */
240
  void (*begin_section) (const char *name);
241
 
242
  /* Write DATA of length LEN to the currently open LTO section.  BLOCK is a
243
     pointer to the dynamically allocated memory containing DATA.  The
244
     append_data function is responsible for freeing it when it is no longer
245
     needed.  */
246
  void (*append_data) (const void *data, size_t len, void *block);
247
 
248
  /* End the previously begun LTO section.  */
249
  void (*end_section) (void);
250
};
251
 
252
/* Language-specific hooks.  See langhooks-def.h for defaults.  */
253
 
254
struct lang_hooks
255
{
256
  /* String identifying the front end.  e.g. "GNU C++".  */
257
  const char *name;
258
 
259
  /* sizeof (struct lang_identifier), so make_node () creates
260
     identifier nodes long enough for the language-specific slots.  */
261
  size_t identifier_size;
262
 
263
  /* Remove any parts of the tree that are used only by the FE. */
264
  void (*free_lang_data) (tree);
265
 
266
  /* Determines the size of any language-specific tcc_constant or
267
     tcc_exceptional nodes.  Since it is called from make_node, the
268
     only information available is the tree code.  Expected to die
269
     on unrecognized codes.  */
270
  size_t (*tree_size) (enum tree_code);
271
 
272
  /* The first callback made to the front end, for simple
273
     initialization needed before any calls to handle_option.  Return
274
     the language mask to filter the switch array with.  */
275
  unsigned int (*init_options) (unsigned int argc, const char **argv);
276
 
277
  /* Callback used to perform language-specific initialization for the
278
     global diagnostic context structure.  */
279
  void (*initialize_diagnostics) (struct diagnostic_context *);
280
 
281
  /* Handle the switch CODE, which has real type enum opt_code from
282
     options.h.  If the switch takes an argument, it is passed in ARG
283
     which points to permanent storage.  The handler is responsible for
284
     checking whether ARG is NULL, which indicates that no argument
285
     was in fact supplied.  For -f and -W switches, VALUE is 1 or 0
286
     for the positive and negative forms respectively.
287
 
288
     Return 1 if the switch is valid, 0 if invalid, and -1 if it's
289
     valid and should not be treated as language-independent too.  */
290
  int (*handle_option) (size_t code, const char *arg, int value);
291
 
292
  /* Return false to use the default complaint about a missing
293
     argument, otherwise output a complaint and return true.  */
294
  bool (*missing_argument) (const char *opt, size_t code);
295
 
296
  /* Called when all command line options have been parsed to allow
297
     further processing and initialization
298
 
299
     Should return true to indicate that a compiler back-end is
300
     not required, such as with the -E option.
301
 
302
     If errorcount is nonzero after this call the compiler exits
303
     immediately and the finish hook is not called.  */
304
  bool (*post_options) (const char **);
305
 
306
  /* Called after post_options to initialize the front end.  Return
307
     false to indicate that no further compilation be performed, in
308
     which case the finish hook is called immediately.  */
309
  bool (*init) (void);
310
 
311
  /* Called at the end of compilation, as a finalizer.  */
312
  void (*finish) (void);
313
 
314
  /* Parses the entire file.  The argument is nonzero to cause bison
315
     parsers to dump debugging information during parsing.  */
316
  void (*parse_file) (int);
317
 
318
  /* Determines if it's ok for a function to have no noreturn attribute.  */
319
  bool (*missing_noreturn_ok_p) (tree);
320
 
321
  /* Called to obtain the alias set to be used for an expression or type.
322
     Returns -1 if the language does nothing special for it.  */
323
  alias_set_type (*get_alias_set) (tree);
324
 
325
  /* Function to finish handling an incomplete decl at the end of
326
     compilation.  Default hook is does nothing.  */
327
  void (*finish_incomplete_decl) (tree);
328
 
329
  /* Replace the DECL_LANG_SPECIFIC data, which may be NULL, of the
330
     DECL_NODE with a newly GC-allocated copy.  */
331
  void (*dup_lang_specific_decl) (tree);
332
 
333
  /* Set the DECL_ASSEMBLER_NAME for a node.  If it is the sort of
334
     thing that the assembler should talk about, set
335
     DECL_ASSEMBLER_NAME to an appropriate IDENTIFIER_NODE.
336
     Otherwise, set it to the ERROR_MARK_NODE to ensure that the
337
     assembler does not talk about it.  */
338
  void (*set_decl_assembler_name) (tree);
339
 
340
  /* The front end can add its own statistics to -fmem-report with
341
     this hook.  It should output to stderr.  */
342
  void (*print_statistics) (void);
343
 
344
  /* Called by print_tree when there is a tree of class tcc_exceptional
345
     that it doesn't know how to display.  */
346
  lang_print_tree_hook print_xnode;
347
 
348
  /* Called to print language-dependent parts of tcc_decl, tcc_type,
349
     and IDENTIFIER_NODE nodes.  */
350
  lang_print_tree_hook print_decl;
351
  lang_print_tree_hook print_type;
352
  lang_print_tree_hook print_identifier;
353
 
354
  /* Computes the name to use to print a declaration.  DECL is the
355
     non-NULL declaration in question.  VERBOSITY determines what
356
     information will be printed: 0: DECL_NAME, demangled as
357
     necessary.  1: and scope information.  2: and any other
358
     information that might be interesting, such as function parameter
359
     types in C++.  The name is in the internal character set and
360
     needs to be converted to the locale character set of diagnostics,
361
     or to the execution character set for strings such as
362
     __PRETTY_FUNCTION__.  */
363
  const char *(*decl_printable_name) (tree decl, int verbosity);
364
 
365
  /* Computes the dwarf-2/3 name for a tree.  VERBOSITY determines what
366
     information will be printed: 0: DECL_NAME, demangled as
367
     necessary.  1: and scope information.  */
368
  const char *(*dwarf_name) (tree, int verbosity);
369
 
370
  /* This compares two types for equivalence ("compatible" in C-based languages).
371
     This routine should only return 1 if it is sure.  It should not be used
372
     in contexts where erroneously returning 0 causes problems.  */
373
  int (*types_compatible_p) (tree x, tree y);
374
 
375
  /* Called by report_error_function to print out function name.  */
376
  void (*print_error_function) (struct diagnostic_context *, const char *,
377
                                struct diagnostic_info *);
378
 
379
  /* Convert a character from the host's to the target's character
380
     set.  The character should be in what C calls the "basic source
381
     character set" (roughly, the set of characters defined by plain
382
     old ASCII).  The default is to return the character unchanged,
383
     which is correct in most circumstances.  Note that both argument
384
     and result should be sign-extended under -fsigned-char,
385
     zero-extended under -fno-signed-char.  */
386
  HOST_WIDE_INT (*to_target_charset) (HOST_WIDE_INT);
387
 
388
  /* Pointers to machine-independent attribute tables, for front ends
389
     using attribs.c.  If one is NULL, it is ignored.  Respectively, a
390
     table of attributes specific to the language, a table of
391
     attributes common to two or more languages (to allow easy
392
     sharing), and a table of attributes for checking formats.  */
393
  const struct attribute_spec *attribute_table;
394
  const struct attribute_spec *common_attribute_table;
395
  const struct attribute_spec *format_attribute_table;
396
 
397
  struct lang_hooks_for_tree_inlining tree_inlining;
398
 
399
  struct lang_hooks_for_callgraph callgraph;
400
 
401
  struct lang_hooks_for_tree_dump tree_dump;
402
 
403
  struct lang_hooks_for_decls decls;
404
 
405
  struct lang_hooks_for_types types;
406
 
407
  struct lang_hooks_for_lto lto;
408
 
409
  /* Returns the generic parameters of an instantiation of
410
     a generic type or decl, e.g. C++ template instantiation.  */
411
  tree (*get_innermost_generic_parms) (const_tree);
412
 
413
  /* Returns the TREE_VEC of arguments of an instantiation
414
     of a generic type of decl, e.g. C++ template instantiation.  */
415
  tree (*get_innermost_generic_args) (const_tree);
416
 
417
  /* Determine if a tree is a function parameter pack.  */
418
  bool (*function_parameter_pack_p) (const_tree);
419
 
420
  /* Perform language-specific gimplification on the argument.  Returns an
421
     enum gimplify_status, though we can't see that type here.  */
422
  int (*gimplify_expr) (tree *, gimple_seq *, gimple_seq *);
423
 
424
  /* Fold an OBJ_TYPE_REF expression to the address of a function.
425
     KNOWN_TYPE carries the true type of the OBJ_TYPE_REF_OBJECT.  */
426
  tree (*fold_obj_type_ref) (tree, tree);
427
 
428
  /* Do language specific processing in the builtin function DECL  */
429
  tree (*builtin_function) (tree decl);
430
 
431
  /* Like builtin_function, but make sure the scope is the external scope.
432
     This is used to delay putting in back end builtin functions until the ISA
433
     that defines the builtin is declared via function specific target options,
434
     which can save memory for machines like the x86_64 that have multiple
435
     ISAs.  If this points to the same function as builtin_function, the
436
     backend must add all of the builtins at program initialization time.  */
437
  tree (*builtin_function_ext_scope) (tree decl);
438
 
439
  /* Used to set up the tree_contains_structure array for a frontend. */
440
  void (*init_ts) (void);
441
 
442
  /* Called by recompute_tree_invariant_for_addr_expr to go from EXPR
443
     to a contained expression or DECL, possibly updating *TC or *SE
444
     if in the process TREE_CONSTANT or TREE_SIDE_EFFECTS need updating.  */
445
  tree (*expr_to_decl) (tree expr, bool *tc, bool *se);
446
 
447
  /* The EH personality function decl.  */
448
  tree (*eh_personality) (void);
449
 
450
  /* Map a type to a runtime object to match type.  */
451
  tree (*eh_runtime_type) (tree);
452
 
453
  /* True if this language uses __cxa_end_cleanup when the ARM EABI
454
     is enabled.  */
455
  bool eh_use_cxa_end_cleanup;
456
 
457
  /* Whenever you add entries here, make sure you adjust langhooks-def.h
458
     and langhooks.c accordingly.  */
459
};
460
 
461
/* Each front end provides its own.  */
462
extern struct lang_hooks lang_hooks;
463
extern tree add_builtin_function (const char *name, tree type,
464
                                  int function_code, enum built_in_class cl,
465
                                  const char *library_name,
466
                                  tree attrs);
467
 
468
extern tree add_builtin_function_ext_scope (const char *name, tree type,
469
                                            int function_code,
470
                                            enum built_in_class cl,
471
                                            const char *library_name,
472
                                            tree attrs);
473
 
474
#endif /* GCC_LANG_HOOKS_H */

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