cgana.c 25.6 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
43
44
45
46
47
48
49
50
51
52
/* Eindeutige Adresse zur Markierung von besuchten Knoten und zur
 * Darstellung der unbekannten Methode. */
static void * MARK = &MARK;



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


static eset * entities = NULL;


53
54
55
/** Bestimmt die eindeutige Methode, die die Methode fr den
 * bergebenen (dynamischen) Typ berschreibt. */
static entity * get_implementation(type * class, entity * method) {
56
  int i;
57
  if (get_entity_peculiarity(method) != peculiarity_description &&
58
      get_entity_owner(method) == class) {
59
60
61
62
    return method;
  }
  for (i = get_entity_n_overwrittenby(method) - 1; i >= 0; --i) {
    entity * e = get_entity_overwrittenby(method, i);
63
    if (get_entity_peculiarity(e) != peculiarity_description && get_entity_owner(e) == class) {
64
65
66
      return e;
    }
  }
67
  for (i = get_class_n_supertypes(class) - 1; i >= 0; --i) {
68
69
70
71
72
    entity * e = get_implementation(get_class_supertype(class, i), method);
    if (e) {
      return e;
    }
  }
Florian Liekweg's avatar
Florian Liekweg committed
73
  assert(0 && "implementation not found");
Till Riedel's avatar
Till Riedel committed
74
  return NULL;
75
76
}

77
78
79
/** 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) {
80
81
82
  entity *impl_meth = NULL;
  ir_node *addr = get_atomic_ent_value(inh_meth);
  assert(addr && "constant entity without value");
83
  if ((get_irn_op(addr) == op_SymConst) &&
Götz Lindenmaier's avatar
Götz Lindenmaier committed
84
	     (get_SymConst_kind(addr) == symconst_addr_ent)) {
Beyhan's avatar
Beyhan committed
85
    impl_meth = get_SymConst_entity(addr);
Götz Lindenmaier's avatar
Götz Lindenmaier committed
86
  } else {
Florian Liekweg's avatar
Florian Liekweg committed
87
    assert(0 && "Complex constant values not supported -- address of method should be straight constant!");
Götz Lindenmaier's avatar
Götz Lindenmaier committed
88
  }
89
  if (impl_meth && (get_entity_peculiarity(impl_meth) != peculiarity_existent)) {
90
91
92
93
94
95
    /*
      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;
96
97
98
99
  }
  return impl_meth? impl_meth : inh_meth;
}

100

101
102
103
104
105
106
107
108
109
110
111
112
113
114
/** 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) {
115
  int i;
116

117
118
  if (get_entity_peculiarity(method) == peculiarity_existent) {
    if (get_entity_visibility(method) == visibility_external_allocated) {
119
120
121
122
      assert(get_entity_irg(method) == NULL);
      *open = true;
    } else {
      assert(get_entity_irg(method) != NULL);
123
      if (!eset_contains(set, method)) {
Florian Liekweg's avatar
Florian Liekweg committed
124
125
        eset_insert(set, method);
        ++(*size);
126
      }
127
128
    }
  }
129

130
  if (get_entity_peculiarity(method) == peculiarity_inherited) {
131
132
    entity *impl_ent = get_inherited_methods_implementation(method);
    assert(impl_ent && "no implementation for inherited entity");
133
    if (get_entity_visibility(impl_ent) == visibility_external_allocated) {
134
135
136
137
138
      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
139
140
        eset_insert(set, impl_ent);
        ++(*size);
141
142
143
      }
    }
  }
144
  /** recursive descent **/
145
  for (i = get_entity_n_overwrittenby(method) - 1; i >= 0; --i)
146
    collect_impls(get_entity_overwrittenby(method, i), set, size, open);
147
148
}

149

150
151
152
153
154
155
156
157
158
159
/** 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
 */
160
161
162
163
164
static entity ** get_impl_methods(entity * method) {
  eset * set = eset_create();
  int size = 0;
  entity ** arr;
  bool open = false;
165

166
  /* Collect all method entities that can be called here */
167
168
  collect_impls(method, set, &size, &open);

169
  /* Vorgaenger einfuegen. */
170
171
172
173
174
175
  if (size == 0 && !open) {
    /* keine implementierte berschriebene Methode */
    arr = NULL;
  } else if (open) {
    entity * ent;
    arr = NEW_ARR_F(entity *, size + 1);
176
177
178
    arr[0] = NULL;  /* Represents open method */
    for (ent = eset_first(set); size > 0; ent = eset_next(set), --size)
      arr[size] = ent;
179
180
181
  } else {
    entity * ent;
    arr = NEW_ARR_F(entity *, size);
182
183
    for (size -= 1, ent = eset_first(set); size >= 0; ent = eset_next(set), --size)
      arr[size] = ent;
184
185
186
187
188
189
  }
  eset_destroy(set);
  return arr;
}


Götz Lindenmaier's avatar
Götz Lindenmaier committed
190
191
192
/* debug makros used in sel_methods_walker */
#define SIZ(x)    sizeof(x)/sizeof((x)[0])

193
#define DBG_OPT_NORMALIZE                                                      \
Florian Liekweg's avatar
Florian Liekweg committed
194
      __dbg_info_merge_pair(new_node, node, dbg_const_eval)
195
196
#define DBG_OPT_POLY_ALLOC                                                     \
  do {                                                                         \
Florian Liekweg's avatar
Florian Liekweg committed
197
198
199
200
    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
201
     } while(0)
202
#define DBG_OPT_POLY                                                           \
Florian Liekweg's avatar
Florian Liekweg committed
203
      __dbg_info_merge_pair(new_node, node, dbg_rem_poly_call)
Götz Lindenmaier's avatar
Götz Lindenmaier committed
204
205


206
207
208
209
210
211
212
213
214
215
216
217

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

220
  if (get_irn_op(node) == op_SymConst) {
221
222
    /* Wenn mglich SymConst-Operation durch Const-Operation
     * ersetzen. */
Beyhan's avatar
Beyhan committed
223
224
    if (get_SymConst_kind(node) == symconst_addr_name) {
      pmap_entry * entry = pmap_find(ldname_map, (void *) get_SymConst_name(node));
225
      if (entry != NULL) { /* Method is declared in the compiled code */
226
227
228
229
230
231
    entity * ent = entry->value;
    if (get_opt_normalize() && (get_entity_visibility(ent) != visibility_external_allocated)) { /* Meth. is defined */
      ir_node *new_node;
      symconst_symbol sym;
      assert(get_entity_irg(ent));
      sym.entity_p = ent;
232
      set_irg_current_block(current_ir_graph, get_nodes_block(node));
233
234
235
236
      new_node = new_d_SymConst(get_irn_dbg_info(node), sym, symconst_addr_ent);       DBG_OPT_NORMALIZE;
      DDMN(new_node);
      exchange(node, new_node);
    }
237
238
      }
    }
239
  } else if (get_irn_op(node) == op_Sel &&
Florian Liekweg's avatar
Florian Liekweg committed
240
             is_method_type(get_entity_type(get_Sel_entity(node)))) {
241
    entity * ent = get_Sel_entity(node);
242
    if (get_opt_optimize() && get_opt_dyn_meth_dispatch() &&
243
        (get_irn_op(skip_Proj(get_Sel_ptr(node))) == op_Alloc)) {
Götz Lindenmaier's avatar
Götz Lindenmaier committed
244
      ir_node *new_node;
Götz Lindenmaier's avatar
Götz Lindenmaier committed
245
      entity *called_ent;
246
      /* We know which method will be called, no dispatch necessary. */
Götz Lindenmaier's avatar
Götz Lindenmaier committed
247
#if 0
248
      assert(get_entity_peculiarity(ent) != peculiarity_description);
249
      set_irg_current_block(current_ir_graph, get_nodes_block(node));
250
      /* @@@ Is this correct?? Alloc could reference a subtype of the owner
Florian Liekweg's avatar
Florian Liekweg committed
251
         of Sel that overwrites the method referenced in Sel. */
Götz Lindenmaier's avatar
Götz Lindenmaier committed
252
      /* @@@ Yes, this is wrong. GL, 10.3.04 */
Götz Lindenmaier's avatar
Götz Lindenmaier committed
253
      new_node = copy_const_value(get_atomic_ent_value(ent));              DBG_OPT_POLY_ALLOC;
Götz Lindenmaier's avatar
Götz Lindenmaier committed
254
255
#else
      called_ent = resolve_ent_polymorphy(get_Alloc_type(skip_Proj(get_Sel_ptr(node))), ent);
256
      set_irg_current_block(current_ir_graph, get_nodes_block(node));
Götz Lindenmaier's avatar
Götz Lindenmaier committed
257
258
259
260
      /* 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;
#endif
Götz Lindenmaier's avatar
Götz Lindenmaier committed
261
      exchange (node, new_node);
262
    } else {
263
      assert(get_entity_peculiarity(ent) != peculiarity_inherited);
264
      if (!eset_contains(entities, ent)) {
Florian Liekweg's avatar
Florian Liekweg committed
265
266
267
268
269
        /* 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);
270
271
      }
      if (get_entity_link(ent) == NULL) {
Florian Liekweg's avatar
Florian Liekweg committed
272
273
274
275
276
277
278
279
280
        /* 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) {
          /* @@@ GL Methode um Fehler anzuzeigen aufrufen! */
          printf("WARNING: Calling method description %s\n  in method %s\n  of class %s\n  which has "
                 "no implementation!\n", get_entity_name(ent),
281
282
                 get_entity_name(get_irg_entity(current_ir_graph)),
                 get_type_name(get_entity_owner(get_irg_entity(current_ir_graph))));
Florian Liekweg's avatar
Florian Liekweg committed
283
284
285
286
287
          printf("This happens when compiling a Java Interface that's never really used, i.e., "
                 "no class implementing the interface is ever used.\n");
        } else {
          exchange(node, new_Bad());
        }
288
      } else {
Florian Liekweg's avatar
Florian Liekweg committed
289
        entity ** arr = get_entity_link(ent);
290
291

#if 0
Florian Liekweg's avatar
Florian Liekweg committed
292
293
        int i;
        printf("\nCall site "); DDMN(node);
294
        printf("  in "); DDME(get_irg_entity(current_ir_graph));
Florian Liekweg's avatar
Florian Liekweg committed
295
296
297
298
299
300
        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");
301
302
#endif

Florian Liekweg's avatar
Florian Liekweg committed
303
304
305
306
307
308
309
        if (get_opt_optimize() && get_opt_dyn_meth_dispatch() &&
            (ARR_LEN(arr) == 1 && arr[0] != NULL)) {
          ir_node *new_node;
          /* Die Sel-Operation kann immer nur einen Wert auf eine
           * interne Methode zurckgeben. Wir knnen daher die
           * Sel-Operation durch eine Const- bzw. SymConst-Operation
           * ersetzen. */
310
          set_irg_current_block(current_ir_graph, get_nodes_block(node));
311
          /* assert(get_entity_peculiarity(tarval_to_entity(get_Const_tarval(get_atomic_ent_value(arr[0])))) == peculiarity_existent); */
Florian Liekweg's avatar
Florian Liekweg committed
312
313
314
          new_node = copy_const_value(get_atomic_ent_value(arr[0]));         DBG_OPT_POLY;
          exchange (node, new_node);
        }
315
316
317
318
319
320
      }
    }
  }
}


321
322
323
/** Datenstruktur initialisieren. Zustzlich werden alle
 *  SymConst-Operationen, die auf interne Methoden verweisen, durch
 *  Const-Operationen ersetzt. */
324
325
static void sel_methods_init(void) {
  int i;
326
  pmap * ldname_map = pmap_create();   /* Map entitiy names to entities: to replace SymConst by Const(ent). */
327
328
329
  assert(entities == NULL);
  entities = eset_create();
  for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
330
    entity * ent = get_irg_entity(get_irp_irg(i));
331
332
    /* Nur extern sichtbare Methode knnen berhaupt mit SymConst
     * aufgerufen werden. */
333
    if (get_entity_visibility(ent) != visibility_local) {
334
335
336
      pmap_insert(ldname_map, (void *) get_entity_ld_ident(ent), ent);
    }
  }
337
  all_irg_walk((irg_walk_func *) sel_methods_walker, NULL, ldname_map);
338
339
340
  pmap_destroy(ldname_map);
}

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

/* 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;
366
  assert(sel && get_irn_op(sel) == op_Sel);
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
  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);

410
  switch (get_irn_opcode(node)) {
411
412
413
414
415
416
  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) {
417
      if (get_irn_op(pred) == op_Tuple) {
Florian Liekweg's avatar
Florian Liekweg committed
418
    callee_ana_proj(get_Tuple_pred(pred, get_Proj_proj(node)), n, methods);
419
      } else {
Florian Liekweg's avatar
Florian Liekweg committed
420
    eset_insert(methods, MARK); /* free method -> unknown */
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
      }
    }
    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
446
  assert(mode_is_reference(get_irn_mode(node)) || is_Bad(node));
447
448
449
450
451
452
453
  /* rekursion verhindern */
  if (get_irn_link(node) == MARK) {
    /* already visited */
    return;
  }
  set_irn_link(node, MARK);

454
  switch (get_irn_opcode(node)) {
455
  case iro_SymConst:
Beyhan's avatar
Beyhan committed
456
457
458
459
    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) {
460
461
    assert(get_entity_irg(ent));
    eset_insert(methods, ent);
Beyhan's avatar
Beyhan committed
462
      } else {
463
    eset_insert(methods, MARK); /* free method -> unknown */
Beyhan's avatar
Beyhan committed
464
465
466
467
468
469
      }
    } else {
      assert(get_SymConst_kind(node) == symconst_addr_name);
      /* externe Methode (wegen fix_symconst!) */
      eset_insert(methods, MARK); /* free method -> unknown */
    }
470
471
472
473
474
475
    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
476
        eset_insert(methods, ent);
477
      } else {
Florian Liekweg's avatar
Florian Liekweg committed
478
        eset_insert(methods, MARK);
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
      }
    }
    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) {
518
  if (get_irn_op(call) == op_Call) {
519
520
521
    eset * methods = eset_create();
    entity * ent;
    entity ** arr = NEW_ARR_F(entity *, 0);
522
    callee_ana_node(skip_Id(get_Call_ptr(call)), methods);
523
524
525
526
527
    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) {
Florian Liekweg's avatar
Florian Liekweg committed
528
    ARR_APP1(entity *, arr, ent);
529
530
531
532
533
534
535
536
      }
    }
    if (ARR_LEN(arr) == 0) {
      /* 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
537
538
539
      /* exchange(call, new_Bad());  invalid firm */

      ir_node *mem = get_Call_mem(call);
540
      turn_into_tuple (call, 5 /* pn_Call_max */);
Götz Lindenmaier's avatar
bugfix    
Götz Lindenmaier committed
541
542
543
544
545
546
      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() ?? */
      set_Tuple_pred(call, pn_Call_M_except        , mem);

547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
    } else {
      set_Call_callee_arr(call, ARR_LEN(arr), arr);
    }
    DEL_ARR_F(arr);
    eset_destroy(methods);
  }
}


/* 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) {
    irg_walk_graph(get_irp_irg(i), callee_walker, NULL, NULL);
Götz Lindenmaier's avatar
Götz Lindenmaier committed
565
    set_irg_callee_info_state(get_irp_irg(i), irg_callee_info_consistent);
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
  }
}



/* --- 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);
583
  switch (get_irn_opcode(node)) {
584
585
586
587
588
  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);
589
    if (get_irn_link(pred) != MARK && get_irn_op(pred) == op_Tuple) {
590
591
592
593
594
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
      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
622
  assert(mode_is_reference(get_irn_mode(node)));
623
624
625
626
  if (get_irn_link(node) == MARK) {
    return; /* already visited */
  }
  set_irn_link(node, MARK);
627
  switch (get_irn_opcode(node)) {
628
629
630
631
  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
632
    eset_insert(set, get_Sel_method(node, i));
633
634
635
636
637
      }
    }
    break;
  }
  case iro_SymConst:
Beyhan's avatar
Beyhan committed
638
639
640
641
642
643
644
645
646
    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 */
    }
647
    break;
648

649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
  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;
  }
674
  switch (get_irn_opcode(node)) {
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
  /* 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);
691
      if (mode_is_reference(get_irn_mode(pred))) {
692
    free_mark(pred, set);
693
694
695
696
697
698
699
      }
    }
    break;
  /* other nodes: Alle anderen Knoten nehmen wir als Verrter an, bis
   * jemand das Gegenteil implementiert. */
  default:
    set_irn_link(node, MARK);
700
    for (i = get_irn_arity(node) - 1; i >= 0; --i) {
701
      ir_node * pred = get_irn_n(node, i);
702
      if (mode_is_reference(get_irn_mode(pred))) {
703
    free_mark(pred, set);
704
705
706
707
708
709
710
711
712
713
714
715
716
      }
    }
    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.  */
717
718
static entity ** get_free_methods(int whole)
{
719
720
721
722
  eset * set = eset_create();
  int i;
  entity ** arr = NEW_ARR_F(entity *, 0);
  entity * ent;
Götz Lindenmaier's avatar
Götz Lindenmaier committed
723

724
725
726
  if (! whole) {
    for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
      ir_graph * irg = get_irp_irg(i);
727
      entity * ent = get_irg_entity(irg);
728
729
730
731
732
733
734
735
736
737
738
      /* 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 */
739
740
  for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
    ir_graph * irg = get_irp_irg(i);
741
    entity * ent = get_irg_entity(irg);
742
    /* insert "external visible" methods. */
743
    if (get_entity_stickyness (ent) == stickyness_sticky) {
744
745
746
      eset_insert(set, ent);
    }
  }
747

Götz Lindenmaier's avatar
Götz Lindenmaier committed
748
  /* Hauptprogramm ist auch dann frei, wenn es nicht "external
749
   * visible" ist. */
Götz Lindenmaier's avatar
Götz Lindenmaier committed
750
  if (get_irp_main_irg()) {
751
    eset_insert(set, get_irg_entity(get_irp_main_irg()));
Boris Boesler's avatar
Boris Boesler committed
752
  }
Götz Lindenmaier's avatar
Götz Lindenmaier committed
753
  /* Wandle Menge in Feld um.  Effizienter. */
754
755
756
757
758
759
760
761
  for (ent = eset_first(set); ent; ent = eset_next(set)) {
    ARR_APP1(entity *, arr, ent);
  }
  eset_destroy(set);

  return arr;
}

762
void cgana(int *length, entity ***free_methods, int whole) {
763
764
765
766
  entity ** free_meths;
  int i;

  sel_methods_init();
767
  free_meths = get_free_methods(whole);
768
769
770
771
772
773
774
775
776
777
  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);
}
778

Götz Lindenmaier's avatar
Götz Lindenmaier committed
779
780
781
782
783
784
785
786
787
788
789
790
791
792


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);
}


793
/* Optimize the address expressions passed to call nodes.
Götz Lindenmaier's avatar
Götz Lindenmaier committed
794
795
796
797
798
799
800
801
802
803
804
805
806
 *
 * 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.
 */
807
808
809
810
811
812
813
814
815
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) {
816
    entity * ent = get_irg_entity(get_irp_irg(i));
817
818
819
820
821
822
    /* 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);
    }
  }
823
  all_irg_walk((irg_walk_func *) sel_methods_walker, NULL, ldname_map);
824
825
826
  pmap_destroy(ldname_map);
#endif
}