cgana.c 25.2 KB
Newer Older
Götz Lindenmaier's avatar
Götz Lindenmaier committed
1
2
3
4
5
6
7
8
9
10
11
12
13
/*
 * Project:     libFIRM
 * File name:   ir/ana/cgana.c
 * Purpose:     Intraprozedural analyses to estimate the call graph.
 * Author:      Hubert Schmid
 * Modified by:
 * Created:     09.06.2002
 * CVS-ID:      $Id$
 * Copyright:   (c) 1999-2003 Universitt Karlsruhe
 * Licence:     This file protected by GPL -  GNU GENERAL PUBLIC LICENSE.
 */

/**
Florian Liekweg's avatar
Florian Liekweg committed
14
 * Intraprozedurale Analyse zur Abschtzung der Aufrufrelation. Es
15
16
17
 * wird eine Menge von freien Methoden und anschlieend die an den
 * Call-Operationen aufrufbaren Methoden bestimmt.
 *
Götz Lindenmaier's avatar
Götz Lindenmaier committed
18
 */
19
20
21
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
22

Götz Lindenmaier's avatar
Götz Lindenmaier committed
23
#include <stdlib.h>
24
#include "cgana.h"
Florian Liekweg's avatar
Florian Liekweg committed
25
#include "rta.h"
26

Götz Lindenmaier's avatar
Götz Lindenmaier committed
27
28
29
#include "irnode_t.h"
#include "irmode_t.h"
#include "irprog_t.h"
30
31
32
33
#include "irgwalk.h"
#include "ircons.h"
#include "irgmod.h"

Götz Lindenmaier's avatar
Götz Lindenmaier committed
34
#include "irflag_t.h"
Götz Lindenmaier's avatar
Götz Lindenmaier committed
35
36
#include "dbginfo_t.h"

Götz Lindenmaier's avatar
Götz Lindenmaier committed
37
38
39
#include "eset.h"
#include "pmap.h"
#include "array.h"
Götz Lindenmaier's avatar
Götz Lindenmaier committed
40

41
42
#include "irdump.h"

43
44
45
46
47
48
49
50
51
52
53
54
/* Eindeutige Adresse zur Markierung von besuchten Knoten und zur
 * Darstellung der unbekannten Methode. */
static void * MARK = &MARK;



/* --- sel methods ---------------------------------------------------------- */


static eset * entities = NULL;


55
56
57
/** Bestimmt die eindeutige Methode, die die Methode fr den
 * bergebenen (dynamischen) Typ berschreibt. */
static entity * get_implementation(type * class, entity * method) {
58
  int i;
59
  if (get_entity_peculiarity(method) != peculiarity_description &&
60
      get_entity_owner(method) == class) {
61
62
63
64
    return method;
  }
  for (i = get_entity_n_overwrittenby(method) - 1; i >= 0; --i) {
    entity * e = get_entity_overwrittenby(method, i);
65
    if (get_entity_peculiarity(e) != peculiarity_description && get_entity_owner(e) == class) {
66
67
68
      return e;
    }
  }
69
  for (i = get_class_n_supertypes(class) - 1; i >= 0; --i) {
70
71
72
73
74
    entity * e = get_implementation(get_class_supertype(class, i), method);
    if (e) {
      return e;
    }
  }
Florian Liekweg's avatar
Florian Liekweg committed
75
  assert(0 && "implementation not found");
Till Riedel's avatar
Till Riedel committed
76
  return NULL;
77
78
}

79
80
81
/** Returns the entity that contains the implementation of the inherited
    entity if available, else returns the entity passed. */
static entity *get_inherited_methods_implementation(entity *inh_meth) {
82
83
84
  entity *impl_meth = NULL;
  ir_node *addr = get_atomic_ent_value(inh_meth);
  assert(addr && "constant entity without value");
85
  if ((get_irn_op(addr) == op_SymConst) &&
Götz Lindenmaier's avatar
Götz Lindenmaier committed
86
	     (get_SymConst_kind(addr) == symconst_addr_ent)) {
Beyhan's avatar
Beyhan committed
87
    impl_meth = get_SymConst_entity(addr);
Götz Lindenmaier's avatar
Götz Lindenmaier committed
88
  } else {
Florian Liekweg's avatar
Florian Liekweg committed
89
    assert(0 && "Complex constant values not supported -- address of method should be straight constant!");
Götz Lindenmaier's avatar
Götz Lindenmaier committed
90
  }
91
  if (impl_meth && (get_entity_peculiarity(impl_meth) != peculiarity_existent)) {
92
93
94
95
96
97
    /*
      printf("this_meth: "); DDMEO(inh_meth);
      printf("impl meth: "); DDMEO(impl_meth);
      assert(!impl_meth || get_entity_peculiarity(impl_meth) == peculiarity_existent);
    */
    impl_meth = NULL;
98
99
100
101
  }
  return impl_meth? impl_meth : inh_meth;
}

102

103
104
105
106
107
108
109
110
111
112
113
114
115
116
/** Collect the entity representing the implementation of this
 *  entity (not the same if inherited) and all entities for overwriting
 *  implementations in "set".
 *  If the implementation of the method is not included in the
 *  compilation unit "open" is set to true.
 *  A recursive descend in the overwritten relation.
 *  Cycle-free, therefore must terminate.
 *
 * @param method
 * @param set      A set of entities.
 * @param size     Number of entities in set.
 * @param open
 */
static void collect_impls(entity *method, eset *set, int *size, bool *open) {
117
  int i;
118

119
120
  if (get_entity_peculiarity(method) == peculiarity_existent) {
    if (get_entity_visibility(method) == visibility_external_allocated) {
121
122
123
124
      assert(get_entity_irg(method) == NULL);
      *open = true;
    } else {
      assert(get_entity_irg(method) != NULL);
125
      if (!eset_contains(set, method)) {
Florian Liekweg's avatar
Florian Liekweg committed
126
127
        eset_insert(set, method);
        ++(*size);
128
      }
129
130
    }
  }
131

132
  if (get_entity_peculiarity(method) == peculiarity_inherited) {
133
134
    entity *impl_ent = get_inherited_methods_implementation(method);
    assert(impl_ent && "no implementation for inherited entity");
135
    if (get_entity_visibility(impl_ent) == visibility_external_allocated) {
136
137
138
139
140
      assert(get_entity_irg(impl_ent) == NULL);
      *open = true;
    } else {
      assert(get_entity_irg(impl_ent) != NULL);
      if (!eset_contains(set, impl_ent)) {
Florian Liekweg's avatar
Florian Liekweg committed
141
142
        eset_insert(set, impl_ent);
        ++(*size);
143
144
145
      }
    }
  }
146
  /** recursive descent **/
147
  for (i = get_entity_n_overwrittenby(method) - 1; i >= 0; --i)
148
    collect_impls(get_entity_overwrittenby(method, i), set, size, open);
149
150
}

151

152
153
154
155
156
157
158
159
160
161
/** Alle Methoden bestimmen, die die bergebene Methode berschreiben
 *  (und implementieren). In der zurckgegebenen Reihung kommt jede
 *  Methode nur einmal vor. Der Wert 'NULL' steht fr unbekannte
 *  (externe) Methoden. Die zurckgegebene Reihung mu vom Aufrufer
 *  wieder freigegeben werden (siehe "DEL_ARR_F"). Gibt es berhaupt
 *  keine Methoden, die "method" berschreiben, so gibt die Methode
 *  "NULL" zurck.
 *
 *  @param method
 */
162
163
164
165
166
static entity ** get_impl_methods(entity * method) {
  eset * set = eset_create();
  int size = 0;
  entity ** arr;
  bool open = false;
167

168
  /* Collect all method entities that can be called here */
169
170
  collect_impls(method, set, &size, &open);

171
  /* Vorgaenger einfuegen. */
172
173
174
175
176
177
  if (size == 0 && !open) {
    /* keine implementierte berschriebene Methode */
    arr = NULL;
  } else if (open) {
    entity * ent;
    arr = NEW_ARR_F(entity *, size + 1);
178
179
180
    arr[0] = NULL;  /* Represents open method */
    for (ent = eset_first(set); size > 0; ent = eset_next(set), --size)
      arr[size] = ent;
181
182
183
  } else {
    entity * ent;
    arr = NEW_ARR_F(entity *, size);
184
185
    for (size -= 1, ent = eset_first(set); size >= 0; ent = eset_next(set), --size)
      arr[size] = ent;
186
187
188
189
190
191
  }
  eset_destroy(set);
  return arr;
}


Götz Lindenmaier's avatar
Götz Lindenmaier committed
192
193
194
/* debug makros used in sel_methods_walker */
#define SIZ(x)    sizeof(x)/sizeof((x)[0])

195
#define DBG_OPT_NORMALIZE                                                      \
Florian Liekweg's avatar
Florian Liekweg committed
196
      __dbg_info_merge_pair(new_node, node, dbg_const_eval)
197
198
#define DBG_OPT_POLY_ALLOC                                                     \
  do {                                                                         \
Florian Liekweg's avatar
Florian Liekweg committed
199
200
201
202
    ir_node *ons[2];                                                       \
    ons[0] = node;                                                         \
    ons[1] = skip_Proj(get_Sel_ptr(node));                                 \
    __dbg_info_merge_sets(&new_node, 1, ons, SIZ(ons), dbg_rem_poly_call); \
Götz Lindenmaier's avatar
Götz Lindenmaier committed
203
     } while(0)
204
#define DBG_OPT_POLY                                                           \
Florian Liekweg's avatar
Florian Liekweg committed
205
      __dbg_info_merge_pair(new_node, node, dbg_rem_poly_call)
Götz Lindenmaier's avatar
Götz Lindenmaier committed
206
207


208
209
210

/** Analyse address computations.
 *
211
 *  - If the node is a SymConst(name) replace it by SymConst(ent) if possible.
212
213
 *  - If the node is a Sel:
 *    * If the pointer to the Sel comes directly from an Alloc node
214
 *      replace the Sel by a SymConst(ent).
215
216
217
218
219
 *
 *
 *  @param node The node to analyze
 *  @param ldname_map A map that mapps names of entities to the entities.
 */
220
static void sel_methods_walker(ir_node * node, pmap * ldname_map) {
221

222
  /* SymConst(name)-Operation durch SymConst(ent)-Operation ersetzen. */
223
  if (get_irn_op(node) == op_SymConst) {
Beyhan's avatar
Beyhan committed
224
225
    if (get_SymConst_kind(node) == symconst_addr_name) {
      pmap_entry * entry = pmap_find(ldname_map, (void *) get_SymConst_name(node));
226
      if (entry != NULL) { /* Method is declared in the compiled code */
227
228
229
230
231
232
233
234
235
	entity * ent = entry->value;
	if (get_opt_normalize() && (get_entity_visibility(ent) != visibility_external_allocated)) { /* Meth. is defined */
	  set_irg_current_block(current_ir_graph, get_nodes_block(node));
	  ir_node *new_node = copy_const_value(get_atomic_ent_value(ent));
	                                                                             DBG_OPT_NORMALIZE;
	  assert(get_entity_irg(ent));
	  DDMN(new_node);
	  exchange(node, new_node);
	}
236
237
      }
    }
238
239
240
241
  }

  else if (get_irn_op(node) == op_Sel &&
	   is_method_type(get_entity_type(get_Sel_entity(node)))) {
242
    entity * ent = get_Sel_entity(node);
243
244

    /* Sel from Alloc: replace by constant */
245
    if (get_opt_optimize() && get_opt_dyn_meth_dispatch() &&
246
        (get_irn_op(skip_Proj(get_Sel_ptr(node))) == op_Alloc)) {
Götz Lindenmaier's avatar
Götz Lindenmaier committed
247
      ir_node *new_node;
Götz Lindenmaier's avatar
Götz Lindenmaier committed
248
      entity *called_ent;
249
      /* We know which method will be called, no dispatch necessary. */
Götz Lindenmaier's avatar
Götz Lindenmaier committed
250
      called_ent = resolve_ent_polymorphy(get_Alloc_type(skip_Proj(get_Sel_ptr(node))), ent);
251
      set_irg_current_block(current_ir_graph, get_nodes_block(node));
Götz Lindenmaier's avatar
Götz Lindenmaier committed
252
253
254
      /* called_ent may not be description: has no Address/Const to Call! */
      assert(get_entity_peculiarity(called_ent) != peculiarity_description);
      new_node = copy_const_value(get_atomic_ent_value(called_ent));       DBG_OPT_POLY_ALLOC;
Götz Lindenmaier's avatar
Götz Lindenmaier committed
255
      exchange (node, new_node);
256
257
258
    }

    else {
259
      assert(get_entity_peculiarity(ent) != peculiarity_inherited);
260
      if (!eset_contains(entities, ent)) {
Florian Liekweg's avatar
Florian Liekweg committed
261
262
263
264
265
        /* Entity noch nicht behandelt. Alle (intern oder extern)
         * implementierten Methoden suchen, die diese Entity
         * berschreiben. Die Menge an entity.link speichern. */
        set_entity_link(ent, get_impl_methods(ent));
        eset_insert(entities, ent);
266
267
      }
      if (get_entity_link(ent) == NULL) {
Florian Liekweg's avatar
Florian Liekweg committed
268
269
270
271
272
273
        /* Die Sel-Operation kann nie einen Zeiger auf eine aufrufbare
         * Methode zurckgeben. Damit ist sie insbesondere nicht
         * ausfhrbar und nicht erreichbar. */
        /* Gib eine Warnung aus wenn die Entitaet eine Beschreibung ist
           fuer die es keine Implementierung gibt. */
        if (get_entity_peculiarity(ent) == peculiarity_description) {
274
	  /* This is possible:  We call a method in a dead part of the program. */
Florian Liekweg's avatar
Florian Liekweg committed
275
        } else {
276
277
278
	  DDMN(node);
	  assert(0);  /* Why should this happen ??? */
          //exchange(node, new_Bad());
Florian Liekweg's avatar
Florian Liekweg committed
279
        }
280
      } else {
Florian Liekweg's avatar
Florian Liekweg committed
281
        entity ** arr = get_entity_link(ent);
282
283

#if 0
Florian Liekweg's avatar
Florian Liekweg committed
284
285
        int i;
        printf("\nCall site "); DDMN(node);
286
        printf("  in "); DDME(get_irg_entity(current_ir_graph));
Florian Liekweg's avatar
Florian Liekweg committed
287
288
289
290
291
292
        printf("  can call:\n");
        for (i = 0; i < ARR_LEN(arr); i++) {
          printf("   - "); DDME(arr[i]);
          printf("     with owner "); DDMT(get_entity_owner(arr[i]));
        }
        printf("\n");
293
294
#endif

Florian Liekweg's avatar
Florian Liekweg committed
295
296
297
        if (get_opt_optimize() && get_opt_dyn_meth_dispatch() &&
            (ARR_LEN(arr) == 1 && arr[0] != NULL)) {
          ir_node *new_node;
298
          /* Die Sel-Operation kann immer nur _einen_ Wert auf eine
Florian Liekweg's avatar
Florian Liekweg committed
299
300
301
           * interne Methode zurckgeben. Wir knnen daher die
           * Sel-Operation durch eine Const- bzw. SymConst-Operation
           * ersetzen. */
302
          set_irg_current_block(current_ir_graph, get_nodes_block(node));
303
304
          assert(get_entity_peculiarity(get_SymConst_entity(get_atomic_ent_value(arr[0]))) ==
	         peculiarity_existent);
Florian Liekweg's avatar
Florian Liekweg committed
305
306
307
          new_node = copy_const_value(get_atomic_ent_value(arr[0]));         DBG_OPT_POLY;
          exchange (node, new_node);
        }
308
309
310
311
312
313
      }
    }
  }
}


314
315
316
/** Datenstruktur initialisieren. Zustzlich werden alle
 *  SymConst-Operationen, die auf interne Methoden verweisen, durch
 *  Const-Operationen ersetzt. */
317
318
static void sel_methods_init(void) {
  int i;
319
  pmap * ldname_map = pmap_create();   /* Map entitiy names to entities: to replace SymConst by Const(ent). */
320
321
322
  assert(entities == NULL);
  entities = eset_create();
  for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
323
    entity * ent = get_irg_entity(get_irp_irg(i));
324
325
    /* Nur extern sichtbare Methode knnen berhaupt mit SymConst
     * aufgerufen werden. */
326
    if (get_entity_visibility(ent) != visibility_local) {
327
328
329
      pmap_insert(ldname_map, (void *) get_entity_ld_ident(ent), ent);
    }
  }
330
  all_irg_walk((irg_walk_func *) sel_methods_walker, NULL, ldname_map);
331
332
333
  pmap_destroy(ldname_map);
}

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

/* Datenstruktur freigeben. */
static void sel_methods_dispose(void) {
  entity * ent;
  assert(entities);
  for (ent = eset_first(entities); ent; ent = eset_next(entities)) {
    entity ** arr = get_entity_link(ent);
    if (arr) {
      DEL_ARR_F(arr);
    }
    set_entity_link(ent, NULL);
  }
  eset_destroy(entities);
  entities = NULL;
}


/* Gibt die Menge aller Methoden zurck, die an diesem Sel-Knoten
 * zurckgegeben werden knnen. Die Liste enthlt keine doppelten
 * Eintrge. */
static entity ** get_Sel_arr(ir_node * sel) {
  static entity ** NULL_ARRAY = NULL;
  entity * ent;
  entity ** arr;
359
  assert(sel && get_irn_op(sel) == op_Sel);
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
  ent = get_Sel_entity(sel);
  assert(is_method_type(get_entity_type(ent))); /* what else? */
  arr = get_entity_link(ent);
  if (arr) {
    return arr;
  } else {
    /* "NULL" zeigt an, dass keine Implementierung existiert. Dies
     * kann fr polymorphe (abstrakte) Methoden passieren. */
    if (!NULL_ARRAY) {
      NULL_ARRAY = NEW_ARR_F(entity *, 0);
    }
    return NULL_ARRAY;
  }
}


static int get_Sel_n_methods(ir_node * sel) {
  return ARR_LEN(get_Sel_arr(sel));
}


static entity * get_Sel_method(ir_node * sel, int pos) {
  entity ** arr = get_Sel_arr(sel);
  assert(pos >= 0 && pos < ARR_LEN(arr));
  return arr[pos];
}



/* --- callee analysis ------------------------------------------------------ */


static void callee_ana_node(ir_node * node, eset * methods);


static void callee_ana_proj(ir_node * node, long n, eset * methods) {
  assert(get_irn_mode(node) == mode_T);
  if (get_irn_link(node) == MARK) {
    /* already visited */
    return;
  }
  set_irn_link(node, MARK);

403
  switch (get_irn_opcode(node)) {
404
405
406
407
408
409
  case iro_Proj: {
    /* proj_proj: in einem "sinnvollen" Graphen kommt jetzt ein
     * op_Tuple oder ein Knoten, der eine "freie Methode"
     * zurckgibt. */
    ir_node * pred = get_Proj_pred(node);
    if (get_irn_link(pred) != MARK) {
410
      if (get_irn_op(pred) == op_Tuple) {
Florian Liekweg's avatar
Florian Liekweg committed
411
    callee_ana_proj(get_Tuple_pred(pred, get_Proj_proj(node)), n, methods);
412
      } else {
Florian Liekweg's avatar
Florian Liekweg committed
413
    eset_insert(methods, MARK); /* free method -> unknown */
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
      }
    }
    break;
  }

  case iro_Tuple:
    callee_ana_node(get_Tuple_pred(node, n), methods);
    break;

  case iro_Id:
    callee_ana_proj(get_Id_pred(node), n, methods);
    break;

  default:
    eset_insert(methods, MARK); /* free method -> unknown */
    break;
  }

  set_irn_link(node, NULL);
}


static void callee_ana_node(ir_node * node, eset * methods) {
  int i;

Michael Beck's avatar
fixed:    
Michael Beck committed
439
  assert(mode_is_reference(get_irn_mode(node)) || is_Bad(node));
440
441
442
443
444
445
446
  /* rekursion verhindern */
  if (get_irn_link(node) == MARK) {
    /* already visited */
    return;
  }
  set_irn_link(node, MARK);

447
  switch (get_irn_opcode(node)) {
448
  case iro_SymConst:
Beyhan's avatar
Beyhan committed
449
450
451
452
    if (get_SymConst_kind(node) == symconst_addr_ent) {
      entity * ent = get_SymConst_entity(node);
      assert(ent && is_method_type(get_entity_type(ent)));
      if (get_entity_visibility(ent) != visibility_external_allocated) {
453
454
	assert(get_entity_irg(ent));
	eset_insert(methods, ent);
Beyhan's avatar
Beyhan committed
455
      } else {
456
	eset_insert(methods, MARK); /* free method -> unknown */
Beyhan's avatar
Beyhan committed
457
458
459
460
461
462
      }
    } else {
      assert(get_SymConst_kind(node) == symconst_addr_name);
      /* externe Methode (wegen fix_symconst!) */
      eset_insert(methods, MARK); /* free method -> unknown */
    }
463
464
465
466
467
468
    break;
  case iro_Sel:
    /* polymorphe Methode */
    for (i = get_Sel_n_methods(node) - 1; i >= 0; --i) {
      entity * ent = get_Sel_method(node, i);
      if (ent) {
Florian Liekweg's avatar
Florian Liekweg committed
469
        eset_insert(methods, ent);
470
      } else {
Florian Liekweg's avatar
Florian Liekweg committed
471
        eset_insert(methods, MARK);
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
      }
    }
    break;

  case iro_Bad:
    /* nothing */
    break;

  case iro_Phi: /* Vereinigung */
    for (i = get_Phi_n_preds(node) - 1; i >= 0; --i) {
      callee_ana_node(get_Phi_pred(node, i), methods);
    }
    break;

  case iro_Id:
    callee_ana_node(get_Id_pred(node), methods);
    break;

  case iro_Proj:
    callee_ana_proj(get_Proj_pred(node), get_Proj_proj(node), methods);
    break;

  case iro_Add:
  case iro_Sub:
  case iro_Conv:
    /* extern */
    eset_insert(methods, MARK); /* free method -> unknown */
    break;

  default:
    assert(0 && "invalid opcode or opcode not implemented");
    break;
  }

  set_irn_link(node, NULL);
}


static void callee_walker(ir_node * call, void * env) {
511
  if (get_irn_op(call) == op_Call) {
512
513
514
    eset * methods = eset_create();
    entity * ent;
    entity ** arr = NEW_ARR_F(entity *, 0);
515
    callee_ana_node(skip_Id(get_Call_ptr(call)), methods);
516
517
518
519
520
    if (eset_contains(methods, MARK)) { /* unknown method */
      ARR_APP1(entity *, arr, NULL);
    }
    for (ent = eset_first(methods); ent; ent = eset_next(methods)) {
      if (ent != MARK) {
521
	ARR_APP1(entity *, arr, ent);
522
523
      }
    }
524
525
526
#if 0  /* This generates Bad nodes when we don't want it.
	  Call it with a check for valid cgana information in local_optimize. */
    if (ARR_LEN(arr) == 0 && get_opt_optimize() && get_opt_dyn_meth_dispatch()) {
527
528
529
530
531
      /* Kann vorkommen, wenn der Vorgnger beispielsweise eine
       * Sel-Operation war, die keine Methoden zurckgeben
       * konnte. Wir ersetzen die Call-Operation ebenfalls durch
       * eine Bad-Operation. Die Verlinkung muss wiederhergestellt
       * werden! */
Götz Lindenmaier's avatar
bugfix    
Götz Lindenmaier committed
532
      ir_node *mem = get_Call_mem(call);
533
      turn_into_tuple (call, 5 /* pn_Call_max */);
Götz Lindenmaier's avatar
bugfix    
Götz Lindenmaier committed
534
535
536
537
      set_Tuple_pred(call, pn_Call_M_regular       , mem);
      set_Tuple_pred(call, pn_Call_T_result        , new_Bad());
      set_Tuple_pred(call, pn_Call_P_value_res_base, new_Bad());
      set_Tuple_pred(call, pn_Call_X_except        , new_Bad());  /* new_Jmp() ?? new_Raise() ?? */
538
      set_Tuple_pred(call, pn_Call_M_except        , new_Bad());
Götz Lindenmaier's avatar
bugfix    
Götz Lindenmaier committed
539

540
541
542
    } else
#endif
    {
543
544
545
546
547
548
549
550
      set_Call_callee_arr(call, ARR_LEN(arr), arr);
    }
    DEL_ARR_F(arr);
    eset_destroy(methods);
  }
}


551
552
553
554
555
556
557
558
559
static void remove_Tuples(ir_node * proj, void * env) {
  ir_node *new;
  if (get_irn_opcode(proj) != iro_Proj) return;

  new = skip_Tuple(proj);
  if (new != proj) exchange(proj, new);
}


560
561
562
563
564
565
566
567
/* Bestimmt fr jede Call-Operation die Menge der aufrufbaren Methode
 * und speichert das Ergebnis in der Call-Operation. (siehe
 * "set_Call_callee"). "sel_methods" wird fr den Aufbau bentigt und
 * muss bereits aufgebaut sein. */
static void callee_ana(void) {
  int i;
  /* Alle Graphen analysieren. */
  for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
568
    irg_walk_graph(get_irp_irg(i), callee_walker, remove_Tuples, NULL);
Götz Lindenmaier's avatar
Götz Lindenmaier committed
569
    set_irg_callee_info_state(get_irp_irg(i), irg_callee_info_consistent);
570
  }
Götz Lindenmaier's avatar
Götz Lindenmaier committed
571
  set_irp_callee_info_state(irg_callee_info_consistent);
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
}



/* --- free method analysis ------------------------------------------------- */


static void free_mark(ir_node * node, eset * set);

static void free_mark_proj(ir_node * node, long n, eset * set) {
  assert(get_irn_mode(node) == mode_T);
  if (get_irn_link(node) == MARK) {
    /* already visited */
    return;
  }
  set_irn_link(node, MARK);
588
  switch (get_irn_opcode(node)) {
589
590
591
592
593
  case iro_Proj: {
    /* proj_proj: in einem "sinnvollen" Graphen kommt jetzt ein
     * op_Tuple oder ein Knoten, der in "free_ana_walker" behandelt
     * wird. */
    ir_node * pred = get_Proj_pred(node);
594
    if (get_irn_link(pred) != MARK && get_irn_op(pred) == op_Tuple) {
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
      free_mark_proj(get_Tuple_pred(pred, get_Proj_proj(node)), n, set);
    } else {
      /* nothing: da in "free_ana_walker" behandelt. */
    }
    break;
  }

  case iro_Tuple:
    free_mark(get_Tuple_pred(node, n), set);
    break;

  case iro_Id:
    free_mark_proj(get_Id_pred(node), n, set);
    break;

  case iro_Start:
  case iro_Alloc:
  case iro_Load:
    /* nothing: Die Operationen werden in "free_ana_walker" selbst
     * behandelt. */
    break;

  default:
    assert(0 && "unexpected opcode or opcode not implemented");
    break;
  }
  set_irn_link(node, NULL);
}


static void free_mark(ir_node * node, eset * set) {
  int i;
Michael Beck's avatar
fixed:    
Michael Beck committed
627
  assert(mode_is_reference(get_irn_mode(node)));
628
629
630
631
  if (get_irn_link(node) == MARK) {
    return; /* already visited */
  }
  set_irn_link(node, MARK);
632
  switch (get_irn_opcode(node)) {
633
634
635
636
  case iro_Sel: {
    entity * ent = get_Sel_entity(node);
    if (is_method_type(get_entity_type(ent))) {
      for (i = get_Sel_n_methods(node) - 1; i >= 0; --i) {
Florian Liekweg's avatar
Florian Liekweg committed
637
    eset_insert(set, get_Sel_method(node, i));
638
639
640
641
642
      }
    }
    break;
  }
  case iro_SymConst:
Beyhan's avatar
Beyhan committed
643
644
645
646
647
648
649
650
651
    if (get_SymConst_kind(node) == symconst_addr_ent) {
      entity * ent = get_SymConst_entity(node);
      if (is_method_type(get_entity_type(ent))) {
        eset_insert(set, ent);
      }
    } else {
      assert(get_SymConst_kind(node) == symconst_addr_name);
      /* nothing: SymConst points to extern method */
    }
652
    break;
653

654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
  case iro_Phi:
    for (i = get_Phi_n_preds(node) - 1; i >= 0; --i) {
      free_mark(get_Phi_pred(node, i), set);
    }
    break;
  case iro_Id:
    free_mark(get_Id_pred(node), set);
    break;
  case iro_Proj:
    free_mark_proj(get_Proj_pred(node), get_Proj_proj(node), set);
    break;
  default:
    /* nothing: Wird unten behandelt! */
    break;
  }
  set_irn_link(node, NULL);
}


static void free_ana_walker(ir_node * node, eset * set) {
  int i;
  if (get_irn_link(node) == MARK) {
    /* bereits in einem Zyklus besucht. */
    return;
  }
679
  switch (get_irn_opcode(node)) {
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
  /* special nodes */
  case iro_Sel:
  case iro_SymConst:
  case iro_Const:
  case iro_Phi:
  case iro_Id:
  case iro_Proj:
  case iro_Tuple:
    /* nothing */
    break;
  /* Sonderbehandlung, da der Funktionszeigereingang natrlich kein
   * Verrter ist. */
  case iro_Call:
    set_irn_link(node, MARK);
    for (i = get_Call_arity(node) - 1; i >= 0; --i) {
      ir_node * pred = get_Call_param(node, i);
696
      if (mode_is_reference(get_irn_mode(pred))) {
697
    free_mark(pred, set);
698
699
700
701
702
703
704
      }
    }
    break;
  /* other nodes: Alle anderen Knoten nehmen wir als Verrter an, bis
   * jemand das Gegenteil implementiert. */
  default:
    set_irn_link(node, MARK);
705
    for (i = get_irn_arity(node) - 1; i >= 0; --i) {
706
      ir_node * pred = get_irn_n(node, i);
707
      if (mode_is_reference(get_irn_mode(pred))) {
708
    free_mark(pred, set);
709
710
711
712
713
714
715
716
717
718
719
720
721
      }
    }
    break;
  }
  set_irn_link(node, NULL);
}


/* Die Datenstrukturen fr sel-Methoden (sel_methods) mu vor dem
 * Aufruf von "get_free_methods" aufgebaut sein. Die (internen)
 * SymConst-Operationen mssen in passende Const-Operationen
 * umgewandelt worden sein, d.h. SymConst-Operationen verweisen immer
 * auf eine echt externe Methode.  */
722
723
static entity ** get_free_methods(int whole)
{
724
725
726
727
  eset * set = eset_create();
  int i;
  entity ** arr = NEW_ARR_F(entity *, 0);
  entity * ent;
Götz Lindenmaier's avatar
Götz Lindenmaier committed
728

729
730
731
  if (! whole) {
    for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
      ir_graph * irg = get_irp_irg(i);
732
      entity * ent = get_irg_entity(irg);
733
734
735
736
737
738
739
740
741
742
743
      /* insert "external visible" methods. */
      if (get_entity_visibility(ent) != visibility_local) {
        eset_insert(set, ent);
      }
      /* Finde alle Methoden die in dieser Methode extern sichtbar werden,
         z.B. da die Adresse einer Methode abgespeichert wird. */
      irg_walk_graph(irg, NULL, (irg_walk_func *) free_ana_walker, set);
    }
  }

  /* insert sticky methods, too */
744
745
  for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
    ir_graph * irg = get_irp_irg(i);
746
    entity * ent = get_irg_entity(irg);
747
    /* insert "external visible" methods. */
748
    if (get_entity_stickyness (ent) == stickyness_sticky) {
749
750
751
      eset_insert(set, ent);
    }
  }
752

Götz Lindenmaier's avatar
Götz Lindenmaier committed
753
  /* Hauptprogramm ist auch dann frei, wenn es nicht "external
754
   * visible" ist. */
Götz Lindenmaier's avatar
Götz Lindenmaier committed
755
  if (get_irp_main_irg()) {
756
    eset_insert(set, get_irg_entity(get_irp_main_irg()));
Boris Boesler's avatar
Boris Boesler committed
757
  }
Götz Lindenmaier's avatar
Götz Lindenmaier committed
758
  /* Wandle Menge in Feld um.  Effizienter. */
759
760
761
762
763
764
765
766
  for (ent = eset_first(set); ent; ent = eset_next(set)) {
    ARR_APP1(entity *, arr, ent);
  }
  eset_destroy(set);

  return arr;
}

767
void cgana(int *length, entity ***free_methods, int whole) {
768
769
770
771
  entity ** free_meths;
  int i;

  sel_methods_init();
772
  free_meths = get_free_methods(whole);
773
774
775
776
777
778
779
780
781
782
  callee_ana();
  sel_methods_dispose();

  /* Convert the flexible array to an array that can be handled
     by standard C. */
  *length = ARR_LEN(free_meths);
  *free_methods = (entity **)malloc(sizeof(entity *) * (*length));
  for (i = 0; i < (*length); i++) (*free_methods)[i] = free_meths[i];
  DEL_ARR_F(free_meths);
}
783

Götz Lindenmaier's avatar
Götz Lindenmaier committed
784
785
786
787
788
789
790
791
792
793
794
795
796
797


static void destruct_walker(ir_node * node, void * env) {
  if (get_irn_op(node) == op_Call) {
    remove_Call_callee_arr(node);
  }
}

void free_callee_info(ir_graph *irg) {
  irg_walk_graph(irg, destruct_walker, NULL, NULL);
  set_irg_callee_info_state(irg, irg_callee_info_none);
}


798
/* Optimize the address expressions passed to call nodes.
Götz Lindenmaier's avatar
Götz Lindenmaier committed
799
800
801
802
803
804
805
806
807
808
809
810
811
 *
 * This optimization performs the following transformations for
 * all ir graphs:
 * - All SymConst operations that refer to intern methods are replaced
 *   by Const operations refering to the corresponding entity.
 * - Sel nodes, that select entities that are not overwritten are
 *   replaced by Const nodes refering to the selected entity.
 * - Sel nodes, for witch no method exists at all are replaced by Bad
 *   nodes.
 * - Sel nodes with a pointer input that is an Alloc node are replaced
 *   by Const nodes refering to the entity that implements the method in
 *   the type given by the Alloc node.
 */
812
813
814
815
816
817
818
819
820
void opt_call_addrs(void) {
  sel_methods_init();
  sel_methods_dispose();
#if 0
  int i;
  pmap * ldname_map = pmap_create();
  assert(entities == NULL);
  entities = eset_create();
  for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
821
    entity * ent = get_irg_entity(get_irp_irg(i));
822
823
824
825
826
827
    /* Nur extern sichtbare Methoden knnen berhaupt mit SymConst
     * aufgerufen werden. */
    if (get_entity_visibility(ent) != local) {
      pmap_insert(ldname_map, (void *) get_entity_ld_ident(ent), ent);
    }
  }
828
  all_irg_walk((irg_walk_func *) sel_methods_walker, NULL, ldname_map);
829
830
831
  pmap_destroy(ldname_map);
#endif
}