aboutsummaryrefslogtreecommitdiffstats
path: root/gcc-4.4.3/gcc/cgraph.h
blob: 2df9d082165dda014f7e2e3b76ca4d5b0f093a54 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
/* Callgraph handling code.
   Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008
   Free Software Foundation, Inc.
   Contributed by Jan Hubicka

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#ifndef GCC_CGRAPH_H
#define GCC_CGRAPH_H
#include "tree.h"
#include "basic-block.h"

enum availability
{
  /* Not yet set by cgraph_function_body_availability.  */
  AVAIL_UNSET,
  /* Function body/variable initializer is unknown.  */
  AVAIL_NOT_AVAILABLE,
  /* Function body/variable initializer is known but might be replaced
     by a different one from other compilation unit and thus needs to
     be dealt with a care.  Like AVAIL_NOT_AVAILABLE it can have
     arbitrary side effects on escaping variables and functions, while
     like AVAILABLE it might access static variables.  */
  AVAIL_OVERWRITABLE,
  /* Function body/variable initializer is known and will be used in final
     program.  */
  AVAIL_AVAILABLE,
  /* Function body/variable initializer is known and all it's uses are explicitly
     visible within current unit (ie it's address is never taken and it is not
     exported to other units).
     Currently used only for functions.  */
  AVAIL_LOCAL
};

extern const char * const cgraph_availability_names[];

/* Information about the function collected locally.
   Available after function is analyzed.  */

struct cgraph_local_info GTY(())
{
  struct inline_summary {
    /* Estimated stack frame consumption by the function.  */
    HOST_WIDE_INT estimated_self_stack_size;

    /* Size of the function before inlining.  */
    int self_insns;
    /* Size of the hot regions of the function before inlining.  */
    int self_hot_insns;
  } inline_summary;

  /* Set when function function is visible in current compilation unit only
     and its address is never taken.  */
  unsigned local : 1;

  /* Set when function is visible by other units.  */
  unsigned externally_visible : 1;

  /* Set once it has been finalized so we consider it to be output.  */
  unsigned finalized : 1;

  /* False when there something makes inlining impossible (such as va_arg).  */
  unsigned inlinable : 1;

  /* True when function should be inlined independently on its size.  */
  unsigned disregard_inline_limits : 1;

  /* True when the function has been originally extern inline, but it is
     redefined now.  */
  unsigned redefined_extern_inline : 1;

  /* True if statics_read_for_function and
     statics_written_for_function contain valid data.  */
  unsigned for_functions_valid : 1;

  /* True if the function is going to be emitted in some other translation
     unit, referenced from vtable.  */
  unsigned vtable_method : 1;
};

/* Information about the function that needs to be computed globally
   once compilation is finished.  Available only with -funit-at-a-time.  */

struct cgraph_global_info GTY(())
{
  /* Estimated stack frame consumption by the function.  */
  HOST_WIDE_INT estimated_stack_size;
  HOST_WIDE_INT estimated_stack_size_pessimistic;

  /* Expected offset of the stack frame of inlined function.  */
  HOST_WIDE_INT stack_frame_offset;

  /* For inline clones this points to the function they will be
     inlined into.  */
  struct cgraph_node *inlined_to;

  /* Estimated size of the function after inlining.  */
  int insns;

  /* Estimated growth after inlining.  INT_MIN if not computed.  */
  int estimated_growth;

  /* Set iff the function has been inlined at least once.  */
  bool inlined;
};

/* Information about the function that is propagated by the RTL backend.
   Available only for functions that has been already assembled.  */

struct cgraph_rtl_info GTY(())
{
   unsigned int preferred_incoming_stack_boundary;
};

/* The cgraph data structure.
   Each function decl has assigned cgraph_node listing callees and callers.  */

struct cgraph_node GTY((chain_next ("%h.next"), chain_prev ("%h.previous")))
{
  tree decl;
  struct cgraph_edge *callees;
  struct cgraph_edge *callers;
  struct cgraph_node *next;
  struct cgraph_node *previous;
  /* For nested functions points to function the node is nested in.  */
  struct cgraph_node *origin;
  /* Points to first nested function, if any.  */
  struct cgraph_node *nested;
  /* Pointer to the next function with same origin, if any.  */
  struct cgraph_node *next_nested;
  /* Pointer to the next function in cgraph_nodes_queue.  */
  struct cgraph_node *next_needed;
  /* Pointer to the next clone.  */
  struct cgraph_node *next_clone;
  struct cgraph_node *prev_clone;
  /* Pointer to a single unique cgraph node for this function.  If the
     function is to be output, this is the copy that will survive.  */
  struct cgraph_node *master_clone;
  /* For functions with many calls sites it holds map from call expression
     to the edge to speed up cgraph_edge function.  */
  htab_t GTY((param_is (struct cgraph_edge))) call_site_hash;

  PTR GTY ((skip)) aux;

  struct cgraph_local_info local;
  struct cgraph_global_info global;
  struct cgraph_rtl_info rtl;

  /* Expected number of executions: calculated in profile.c.  */
  gcov_type count;
  /* Maximum count of any basic block in the function.  */
  gcov_type max_bb_count;
  /* Unique id of the node.  */
  int uid;
  /* Ordering of all cgraph nodes.  */
  int order;

  /* unique id for profiling. pid is not suitable because of different
     number of cfg nodes with -fprofile-generate and -fprofile-use */
  int pid;

  /* Set when function must be output - it is externally visible
     or its address is taken.  */
  unsigned needed : 1;
  /* Set when decl is an abstract function pointed to by the
     ABSTRACT_DECL_ORIGIN of a reachable function.  */
  unsigned abstract_and_needed : 1;
  /* Set when function is reachable by call from other function
     that is either reachable or needed.  */
  unsigned reachable : 1;
  /* Set once the function is lowered (i.e. its CFG is built).  */
  unsigned lowered : 1;
  /* Set once the function has been instantiated and its callee
     lists created.  */
  unsigned analyzed : 1;
  /* Set when function is scheduled to be assembled.  */
  unsigned output : 1;
  /* Set for aliases once they got through assemble_alias.  */
  unsigned alias : 1;

  /* Is this function cloned during versioning ?  */
  unsigned is_versioned_clone : 1;

  /* In non-unit-at-a-time mode the function body of inline candidates is saved
     into clone before compiling so the function in original form can be
     inlined later.  This pointer points to the clone.  */
  tree inline_decl;
};

struct cgraph_edge GTY((chain_next ("%h.next_caller"), chain_prev ("%h.prev_caller")))
{
  struct cgraph_node *caller;
  struct cgraph_node *callee;
  struct cgraph_edge *prev_caller;
  struct cgraph_edge *next_caller;
  struct cgraph_edge *prev_callee;
  struct cgraph_edge *next_callee;
  gimple call_stmt;
  PTR GTY ((skip (""))) aux;
  /* When NULL, inline this call.  When non-NULL, points to the explanation
     why function was not inlined.  */
  const char *inline_failed;
  /* Expected number of executions: calculated in profile.c.  */
  gcov_type count;
  /* Expected frequency of executions within the function. 
     When set to CGRAPH_FREQ_BASE, the edge is expected to be called once
     per function call.  The range is 0 to CGRAPH_FREQ_MAX.  */
  int frequency;
  /* Depth of loop nest, 1 means no loop nest.  */
  unsigned int loop_nest : 31;
  /* Whether this edge describes a call that was originally indirect.  */
  unsigned int indirect_call : 1;
  /* Unique id of the edge.  */
  int uid;
};

#define CGRAPH_FREQ_BASE 1000
#define CGRAPH_FREQ_MAX 100000

typedef struct cgraph_edge *cgraph_edge_p;

DEF_VEC_P(cgraph_edge_p);
DEF_VEC_ALLOC_P(cgraph_edge_p,heap);

/* The varpool data structure.
   Each static variable decl has assigned varpool_node.  */

struct varpool_node GTY((chain_next ("%h.next")))
{
  tree decl;
  /* Pointer to the next function in varpool_nodes.  */
  struct varpool_node *next;
  /* Pointer to the next function in varpool_nodes_queue.  */
  struct varpool_node *next_needed;
  /* Ordering of all cgraph nodes.  */
  int order;

  /* The module in which it is first declared.  */
  unsigned module_id;
  /* Set when function must be output - it is externally visible
     or its address is taken.  */
  unsigned needed : 1;
  /* Needed variables might become dead by optimization.  This flag
     forces the variable to be output even if it appears dead otherwise.  */
  unsigned force_output : 1;
  /* Set once the variable has been instantiated and its callee
     lists created.  */
  unsigned analyzed : 1;
  /* Set once it has been finalized so we consider it to be output.  */
  unsigned finalized : 1;
  /* Set when variable is scheduled to be assembled.  */
  unsigned output : 1;
  /* Set when function is visible by other units.  */
  unsigned externally_visible : 1;
  /* Set for aliases once they got through assemble_alias.  */
  unsigned alias : 1;
};

/* Every top level asm statement is put into a cgraph_asm_node.  */

struct cgraph_asm_node GTY(())
{
  /* Next asm node.  */
  struct cgraph_asm_node *next;
  /* String for this asm node.  */
  tree asm_str;
  /* Ordering of all cgraph nodes.  */
  int order;
};

extern GTY(()) struct cgraph_node *cgraph_nodes;
extern GTY(()) int cgraph_n_nodes;
extern GTY(()) int cgraph_max_uid;
extern GTY(()) int cgraph_edge_max_uid;
extern GTY(()) int cgraph_max_pid;
extern bool cgraph_global_info_ready;
enum cgraph_state
{
  /* Callgraph is being constructed.  It is safe to add new functions.  */
  CGRAPH_STATE_CONSTRUCTION,
  /* Callgraph is built and IPA passes are being run.  */
  CGRAPH_STATE_IPA,
  /* Callgraph is built and all functions are transformed to SSA form.  */
  CGRAPH_STATE_IPA_SSA,
  /* Functions are now ordered and being passed to RTL expanders.  */
  CGRAPH_STATE_EXPANSION,
  /* All cgraph expansion is done.  */
  CGRAPH_STATE_FINISHED
};
extern enum cgraph_state cgraph_state;
extern bool cgraph_function_flags_ready;
extern GTY(()) struct cgraph_node *cgraph_nodes_queue;
extern GTY(()) struct cgraph_node *cgraph_new_nodes;

extern GTY(()) struct cgraph_asm_node *cgraph_asm_nodes;
extern GTY(()) int cgraph_order;

/* In cgraph.c  */
void dump_cgraph (FILE *);
void debug_cgraph (void);
void dump_cgraph_node (FILE *, struct cgraph_node *);
void debug_cgraph_node (struct cgraph_node *);
void cgraph_insert_node_to_hashtable (struct cgraph_node *node);
void cgraph_remove_edge (struct cgraph_edge *);
void cgraph_remove_node (struct cgraph_node *);
void cgraph_add_assembler_hash_node (struct cgraph_node *);
void cgraph_remove_assembler_hash_node (struct cgraph_node *);
void cgraph_remove_fake_indirect_call_in_edges (struct cgraph_node *);
extern bool cgraph_need_artificial_indirect_call_edges;
extern bool cgraph_is_fake_indirect_call_edge (struct cgraph_edge *e);

void cgraph_release_function_body (struct cgraph_node *);
void cgraph_node_remove_callees (struct cgraph_node *node);
struct cgraph_edge *cgraph_create_edge (struct cgraph_node *,
					struct cgraph_node *,
					gimple, gcov_type, int, int);
struct cgraph_node *cgraph_node (tree);
struct cgraph_node *cgraph_node_for_asm (tree asmname);
struct cgraph_edge *cgraph_edge (struct cgraph_node *, gimple);
void cgraph_set_call_stmt (struct cgraph_edge *, gimple);
void cgraph_update_edges_for_call_stmt (gimple, gimple);
struct cgraph_local_info *cgraph_local_info (tree);
struct cgraph_global_info *cgraph_global_info (tree);
struct cgraph_rtl_info *cgraph_rtl_info (tree);
const char * cgraph_node_name (struct cgraph_node *);
struct cgraph_edge * cgraph_clone_edge (struct cgraph_edge *,
					struct cgraph_node *,
					gimple, gcov_type, int, int, bool);
struct cgraph_node * cgraph_clone_node (struct cgraph_node *, gcov_type, int,
					int, bool);

void cgraph_redirect_edge_callee (struct cgraph_edge *, struct cgraph_node *);

struct cgraph_asm_node *cgraph_add_asm_node (tree);

bool cgraph_function_possibly_inlined_p (tree);
void cgraph_unnest_node (struct cgraph_node *);

enum availability cgraph_function_body_availability (struct cgraph_node *);
bool cgraph_is_master_clone (struct cgraph_node *);
struct cgraph_node *cgraph_master_clone (struct cgraph_node *);
void cgraph_add_new_function (tree, bool);

void dump_vcg_cgraph (FILE *, int, bool);

/* In cgraphunit.c  */
void cgraph_finalize_function (tree, bool);
void cgraph_mark_if_needed (tree);
void cgraph_finalize_compilation_unit (void);
void cgraph_optimize (void);
void cgraph_mark_needed_node (struct cgraph_node *);
void cgraph_mark_reachable_node (struct cgraph_node *);
bool cgraph_inline_p (struct cgraph_edge *, const char **reason);
bool cgraph_preserve_function_body_p (tree);
void verify_cgraph (void);
void verify_cgraph_node (struct cgraph_node *);
void cgraph_build_static_cdtor (char which, tree body, int priority);
void cgraph_reset_static_var_maps (void);
void init_cgraph (void);
struct cgraph_node *cgraph_function_versioning (struct cgraph_node *,
						VEC(cgraph_edge_p,heap)*,
						varray_type,
						bitmap);
void cgraph_analyze_function (struct cgraph_node *);
struct cgraph_node *save_inline_function_body (struct cgraph_node *);
void record_references_in_initializer (tree);
bool cgraph_process_new_functions (void);

/* Module info structure.  */ 
struct cgraph_mod_info GTY (())
{
  unsigned module_id;
};

/* LIPO linker symbol table entry for functions.  */

struct cgraph_sym GTY(())
{
  tree assembler_name;
  struct cgraph_node *rep_node;
  tree rep_decl;
  htab_t GTY ((param_is (struct cgraph_mod_info))) def_module_hash;
  bool is_promoted_static;
};

void cgraph_init_gid_map (void);
void cgraph_add_fake_indirect_call_edges (void);
void cgraph_do_link (void);
struct cgraph_sym *cgraph_link_node (struct cgraph_node *);
tree cgraph_find_decl (tree asm_name);
void cgraph_remove_link_node (struct cgraph_node *node);
struct cgraph_node *cgraph_real_node (tree decl);
struct cgraph_node *cgraph_real_node_1 (tree decl, bool);
unsigned  cgraph_get_module_id (tree fndecl);
bool cgraph_is_auxiliary (tree fndecl);
void cgraph_process_module_scope_statics (void);
bool cgraph_is_promoted_static_func (tree fndecl);
bool cgraph_is_inline_body_available_in_module (tree fndecl, unsigned module_id);
bool cgraph_is_decl_external (struct cgraph_node *);
void cgraph_unify_type_alias_sets (void);
void varpool_do_link (void);
void varpool_link_node (struct varpool_node *);
void varpool_remove_link_node (struct varpool_node *node);
struct varpool_node *real_varpool_node (tree decl);
bool varpool_is_auxiliary (struct varpool_node *node);
void varpool_get_referenced_asm_ids (VEC(tree, gc) **);
void varpool_clear_asm_id_reference_bit (void);
void varpool_reset_queue (void);
void varpool_remove_duplicate_weak_decls (void);

typedef void (*cgraph_edge_hook)(struct cgraph_edge *, void *);
typedef void (*cgraph_node_hook)(struct cgraph_node *, void *);
typedef void (*cgraph_2edge_hook)(struct cgraph_edge *, struct cgraph_edge *,
				  void *);
typedef void (*cgraph_2node_hook)(struct cgraph_node *, struct cgraph_node *,
				  void *);
struct cgraph_edge_hook_list;
struct cgraph_node_hook_list;
struct cgraph_2edge_hook_list;
struct cgraph_2node_hook_list;
struct cgraph_edge_hook_list *cgraph_add_edge_removal_hook (cgraph_edge_hook, void *);
void cgraph_remove_edge_removal_hook (struct cgraph_edge_hook_list *);
struct cgraph_node_hook_list *cgraph_add_node_removal_hook (cgraph_node_hook,
							    void *);
void cgraph_remove_node_removal_hook (struct cgraph_node_hook_list *);
struct cgraph_node_hook_list *cgraph_add_function_insertion_hook (cgraph_node_hook,
							          void *);
void cgraph_remove_function_insertion_hook (struct cgraph_node_hook_list *);
void cgraph_call_function_insertion_hooks (struct cgraph_node *node);
struct cgraph_2edge_hook_list *cgraph_add_edge_duplication_hook (cgraph_2edge_hook, void *);
void cgraph_remove_edge_duplication_hook (struct cgraph_2edge_hook_list *);
struct cgraph_2node_hook_list *cgraph_add_node_duplication_hook (cgraph_2node_hook, void *);
void cgraph_remove_node_duplication_hook (struct cgraph_2node_hook_list *);

/* In cgraphbuild.c  */
unsigned int rebuild_cgraph_edges (void);
int compute_call_stmt_bb_frequency (basic_block bb);

/* In ipa.c  */
bool cgraph_remove_unreachable_nodes (bool, FILE *);
int cgraph_postorder (struct cgraph_node **);

bool cgraph_maybe_hot_edge_p (struct cgraph_edge *e);

/* In varpool.c  */

extern GTY(()) struct varpool_node *varpool_nodes_queue;
extern GTY(()) struct varpool_node *varpool_nodes;

struct varpool_node *varpool_node (tree);
struct varpool_node *varpool_node_for_asm (tree asmname);
void varpool_mark_needed_node (struct varpool_node *);
void dump_varpool (FILE *);
void dump_varpool_node (FILE *, struct varpool_node *);

void varpool_finalize_decl (tree);
bool decide_is_variable_needed (struct varpool_node *, tree);
enum availability cgraph_variable_initializer_availability (struct varpool_node *);

bool varpool_assemble_pending_decls (void);
bool varpool_assemble_decl (struct varpool_node *node);
bool varpool_analyze_pending_decls (void);
void varpool_remove_unreferenced_decls (void);
void varpool_empty_needed_queue (void);

/* Walk all reachable static variables.  */
#define FOR_EACH_STATIC_VARIABLE(node) \
   for ((node) = varpool_nodes_queue; (node); (node) = (node)->next_needed)

/* Return first reachable static variable with initializer.  */
static inline struct varpool_node *
varpool_first_static_initializer (void)
{
  struct varpool_node *node;
  for (node = varpool_nodes_queue; node; node = node->next_needed)
    {
      gcc_assert (TREE_CODE (node->decl) == VAR_DECL);
      if (DECL_INITIAL (node->decl))
	return node;
    }
  return NULL;
}

/* Return next reachable static variable with initializer after NODE.  */
static inline struct varpool_node *
varpool_next_static_initializer (struct varpool_node *node)
{
  for (node = node->next_needed; node; node = node->next_needed)
    {
      gcc_assert (TREE_CODE (node->decl) == VAR_DECL);
      if (DECL_INITIAL (node->decl))
	return node;
    }
  return NULL;
}

/* Walk all static variables with initializer set.  */
#define FOR_EACH_STATIC_INITIALIZER(node) \
   for ((node) = varpool_first_static_initializer (); (node); \
        (node) = varpool_next_static_initializer (node))

/* In ipa-inline.c  */

/* Contains list of user-specified files containing inlining decisions
   for particular inlining passes.  */

struct inline_plan_file
{
  char *pass_name;
  char *filename;
  struct inline_plan_file *next;
};
extern struct inline_plan_file *inline_plan_files;

void cgraph_clone_inlined_nodes (struct cgraph_edge *, bool, bool);
bool cgraph_default_inline_p (struct cgraph_node *, const char **);
unsigned int compute_inline_parameters (struct cgraph_node *);

void compute_hot_components (void);
void free_hot_components (void);
void dump_hot_components (FILE *);
void verify_hot_components (void);
bool cgraph_gate_ipa_early_inlining (void);

/* Create a new static variable of type TYPE.  */
tree add_new_static_var (tree type);

#endif  /* GCC_CGRAPH_H  */