aboutsummaryrefslogtreecommitdiffstats
path: root/gcc-4.9/gcc/ipa-ref.c
blob: 6aa41e6cfb4ee0e06d59b3ecb973dcf367a80cb4 (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
/* Interprocedural reference lists.
   Copyright (C) 2010-2014 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/>.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tree.h"
#include "ggc.h"
#include "target.h"
#include "cgraph.h"
#include "ipa-utils.h"

static const char *ipa_ref_use_name[] = {"read","write","addr","alias"};

/* Return ipa reference from REFERING_NODE or REFERING_VARPOOL_NODE
   to REFERED_NODE or REFERED_VARPOOL_NODE. USE_TYPE specify type
   of the use and STMT the statement (if it exists).  */

struct ipa_ref *
ipa_record_reference (symtab_node *referring_node,
		      symtab_node *referred_node,
		      enum ipa_ref_use use_type, gimple stmt)
{
  struct ipa_ref *ref, *ref2;
  struct ipa_ref_list *list, *list2;
  ipa_ref_t *old_references;

  gcc_checking_assert (!stmt || is_a <cgraph_node> (referring_node));
  gcc_checking_assert (use_type != IPA_REF_ALIAS || !stmt);

  list = &referring_node->ref_list;
  old_references = vec_safe_address (list->references);
  vec_safe_grow (list->references, vec_safe_length (list->references) + 1);
  ref = &list->references->last ();

  list2 = &referred_node->ref_list;
  list2->referring.safe_push (ref);
  ref->referred_index = list2->referring.length () - 1;
  ref->referring = referring_node;
  ref->referred = referred_node;
  ref->stmt = stmt;
  ref->lto_stmt_uid = 0;
  ref->use = use_type;
  ref->speculative = 0;

  /* If vector was moved in memory, update pointers.  */
  if (old_references != list->references->address ())
    {
      int i;
      for (i = 0; ipa_ref_list_reference_iterate (list, i, ref2); i++)
	ipa_ref_referred_ref_list (ref2)->referring[ref2->referred_index] = ref2;
    }
  return ref;
}

/* If VAL is a reference to a function or a variable, add a reference from
   REFERRING_NODE to the corresponding symbol table node.  USE_TYPE specify
   type of the use and STMT the statement (if it exists).  Return the new
   reference or NULL if none was created.  */

struct ipa_ref *
ipa_maybe_record_reference (symtab_node *referring_node, tree val,
			    enum ipa_ref_use use_type, gimple stmt)
{
  STRIP_NOPS (val);
  if (TREE_CODE (val) != ADDR_EXPR)
    return NULL;
  val = get_base_var (val);
  if (val && (TREE_CODE (val) == FUNCTION_DECL
	       || TREE_CODE (val) == VAR_DECL))
    {
      symtab_node *referred = symtab_get_node (val);
      gcc_checking_assert (referred);
      return ipa_record_reference (referring_node, referred,
				   use_type, stmt);
    }
  return NULL;
}

/* Remove reference REF.  */

void
ipa_remove_reference (struct ipa_ref *ref)
{
  struct ipa_ref_list *list = ipa_ref_referred_ref_list (ref);
  struct ipa_ref_list *list2 = ipa_ref_referring_ref_list (ref);
  vec<ipa_ref_t, va_gc> *old_references = list2->references;
  struct ipa_ref *last;

  gcc_assert (list->referring[ref->referred_index] == ref);
  last = list->referring.last ();
  if (ref != last)
    {
      list->referring[ref->referred_index] = list->referring.last ();
      list->referring[ref->referred_index]->referred_index 
	  = ref->referred_index;
    }
  list->referring.pop ();

  last = &list2->references->last ();
  if (ref != last)
    {
      *ref = *last;
      ipa_ref_referred_ref_list (ref)->referring[ref->referred_index] = ref;
    }
  list2->references->pop ();
  gcc_assert (list2->references == old_references);
}

/* Remove all references in ref list LIST.  */

void
ipa_remove_all_references (struct ipa_ref_list *list)
{
  while (vec_safe_length (list->references))
    ipa_remove_reference (&list->references->last ());
  vec_free (list->references);
}

/* Remove all references in ref list LIST.  */

void
ipa_remove_all_referring (struct ipa_ref_list *list)
{
  while (list->referring.length ())
    ipa_remove_reference (list->referring.last ());
  list->referring.release ();
}

/* Dump references in LIST to FILE.  */

void
ipa_dump_references (FILE * file, struct ipa_ref_list *list)
{
  struct ipa_ref *ref;
  int i;
  for (i = 0; ipa_ref_list_reference_iterate (list, i, ref); i++)
    {
      fprintf (file, "%s/%i (%s)",
               ref->referred->asm_name (),
               ref->referred->order,
	       ipa_ref_use_name [ref->use]);
      if (ref->speculative)
	fprintf (file, " (speculative)");
    }
  fprintf (file, "\n");
}

/* Dump referring in LIST to FILE.  */

void
ipa_dump_referring (FILE * file, struct ipa_ref_list *list)
{
  struct ipa_ref *ref;
  int i;
  for (i = 0; ipa_ref_list_referring_iterate (list, i, ref); i++)
    {
      fprintf (file, "%s/%i (%s)",
               ref->referring->asm_name (),
               ref->referring->order,
	       ipa_ref_use_name [ref->use]);
      if (ref->speculative)
	fprintf (file, " (speculative)");
    }
  fprintf (file, "\n");
}

/* Clone reference REF to DEST_NODE and set its stmt to STMT.  */

struct ipa_ref *
ipa_clone_ref (struct ipa_ref *ref,
	       symtab_node *dest_node,
	       gimple stmt)
{
  bool speculative = ref->speculative;
  unsigned int stmt_uid = ref->lto_stmt_uid;
  struct ipa_ref *ref2;

  ref2 = ipa_record_reference (dest_node,
			       ref->referred,
			       ref->use, stmt);
  ref2->speculative = speculative;
  ref2->lto_stmt_uid = stmt_uid;
  return ref2;
}

/* Clone all references from SRC to DEST_NODE or DEST_VARPOOL_NODE.  */

void
ipa_clone_references (symtab_node *dest_node,
		      struct ipa_ref_list *src)
{
  struct ipa_ref *ref, *ref2;
  int i;
  for (i = 0; ipa_ref_list_reference_iterate (src, i, ref); i++)
    {
      bool speculative = ref->speculative;
      unsigned int stmt_uid = ref->lto_stmt_uid;

      ref2 = ipa_record_reference (dest_node,
				   ref->referred,
				   ref->use, ref->stmt);
      ref2->speculative = speculative;
      ref2->lto_stmt_uid = stmt_uid;
    }
}

/* Clone all referring from SRC to DEST_NODE or DEST_VARPOOL_NODE.  */

void
ipa_clone_referring (symtab_node *dest_node,
		    struct ipa_ref_list *src)
{
  struct ipa_ref *ref, *ref2;
  int i;
  for (i = 0; ipa_ref_list_referring_iterate (src, i, ref); i++)
    {
      bool speculative = ref->speculative;
      unsigned int stmt_uid = ref->lto_stmt_uid;

      ref2 = ipa_record_reference (ref->referring,
				   dest_node,
				   ref->use, ref->stmt);
      ref2->speculative = speculative;
      ref2->lto_stmt_uid = stmt_uid;
    }
}

/* Return true when execution of REF can lead to return from
   function. */
bool
ipa_ref_cannot_lead_to_return (struct ipa_ref *ref)
{
  return cgraph_node_cannot_return (ipa_ref_referring_node (ref));
}

/* Return true if list contains an alias.  */
bool
ipa_ref_has_aliases_p (struct ipa_ref_list *ref_list)
{
  struct ipa_ref *ref;
  int i;

  for (i = 0; ipa_ref_list_referring_iterate (ref_list, i, ref); i++)
    if (ref->use == IPA_REF_ALIAS)
      return true;
  return false;
}

/* Find the structure describing a reference in REFERRING_NODE to REFERRED_NODE
   and associated with statement STMT.  */

struct ipa_ref *
ipa_find_reference (symtab_node *referring_node, symtab_node *referred_node,
		    gimple stmt, unsigned int lto_stmt_uid)
{
  struct ipa_ref *r = NULL;
  int i;

  for (i = 0; ipa_ref_list_reference_iterate (&referring_node->ref_list, i, r); i++)
    if (r->referred == referred_node
	&& !r->speculative
	&& ((stmt && r->stmt == stmt)
	    || (lto_stmt_uid && r->lto_stmt_uid == lto_stmt_uid)
	    || (!stmt && !lto_stmt_uid && !r->stmt && !r->lto_stmt_uid)))
      return r;
  return NULL;
}

/* Remove all references from REFERRING_NODE that are associated with statement
   STMT.  */

void
ipa_remove_stmt_references (symtab_node *referring_node, gimple stmt)
{
  struct ipa_ref *r = NULL;
  int i = 0;

  while (ipa_ref_list_reference_iterate (&referring_node->ref_list, i, r))
    if (r->stmt == stmt)
      ipa_remove_reference (r);
    else
      i++;
}

/* Remove all stmt references in non-speculative references.
   Those are not maintained during inlining & clonning. 
   The exception are speculative references that are updated along
   with callgraph edges associated with them.  */

void
ipa_clear_stmts_in_references (symtab_node *referring_node)
{
  struct ipa_ref *r = NULL;
  int i;

  for (i = 0; ipa_ref_list_reference_iterate (&referring_node->ref_list, i, r); i++)
    if (!r->speculative)
      {
	r->stmt = NULL;
	r->lto_stmt_uid = 0;
      }
}