3 * File name: ir/ana/cgana.c
4 * Purpose: Intraprozedural analyses to estimate the call graph.
5 * Author: Hubert Schmid
9 * Copyright: (c) 1999-2003 Universität Karlsruhe
10 * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
14 * Intraprozedurale Analyse zur Abschätzung der Aufrufrelation. Es
15 * wird eine Menge von freien Methoden und anschließend die an den
16 * Call-Operationen aufrufbaren Methoden bestimmt.
35 #include "dbginfo_t.h"
41 /* Eindeutige Adresse zur Markierung von besuchten Knoten und zur
42 * Darstellung der unbekannten Methode. */
43 static void * MARK = &MARK;
47 /* --- sel methods ---------------------------------------------------------- */
50 static eset * entities = NULL;
53 /** Bestimmt die eindeutige Methode, die die Methode für den
54 * übergebenen (dynamischen) Typ überschreibt. */
55 static entity * get_implementation(type * class, entity * method) {
57 if (get_entity_peculiarity(method) != peculiarity_description &&
58 get_entity_owner(method) == class) {
61 for (i = get_entity_n_overwrittenby(method) - 1; i >= 0; --i) {
62 entity * e = get_entity_overwrittenby(method, i);
63 if (get_entity_peculiarity(e) != peculiarity_description && get_entity_owner(e) == class) {
67 for (i = get_class_n_supertypes(class) - 1; i >= 0; --i) {
68 entity * e = get_implementation(get_class_supertype(class, i), method);
73 assert(0 && "implementation not found");
77 /** Returns the entity that contains the implementation of the inherited
78 entity if available, else returns the entity passed. */
79 static entity *get_inherited_methods_implementation(entity *inh_meth) {
80 entity *impl_meth = NULL;
81 ir_node *addr = get_atomic_ent_value(inh_meth);
82 assert(addr && "constant entity without value");
84 if (get_irn_op(addr) == op_Const) {
85 impl_meth = get_tarval_entity(get_Const_tarval(addr));
86 } else if ((get_irn_op(addr) == op_SymConst) &&
87 (get_SymConst_kind(addr) == symconst_addr_ent)) {
88 impl_meth = get_SymConst_entity(addr);
90 assert(0 && "Complex constant values not supported -- address of method should be straight constant!");
92 if (impl_meth && (get_entity_peculiarity(impl_meth) != peculiarity_existent)) {
94 printf("this_meth: "); DDMEO(inh_meth);
95 printf("impl meth: "); DDMEO(impl_meth);
96 assert(!impl_meth || get_entity_peculiarity(impl_meth) == peculiarity_existent);
100 return impl_meth? impl_meth : inh_meth;
104 /** Collect the entity representing the implementation of this
105 * entity (not the same if inherited) and all entities for overwriting
106 * implementations in "set".
107 * If the implementation of the method is not included in the
108 * compilation unit "open" is set to true.
109 * A recursive descend in the overwritten relation.
110 * Cycle-free, therefore must terminate.
113 * @param set A set of entities.
114 * @param size Number of entities in set.
117 static void collect_impls(entity *method, eset *set, int *size, bool *open) {
120 if (get_entity_peculiarity(method) == peculiarity_existent) {
121 if (get_entity_visibility(method) == visibility_external_allocated) {
122 assert(get_entity_irg(method) == NULL);
125 assert(get_entity_irg(method) != NULL);
126 if (!eset_contains(set, method)) {
127 eset_insert(set, method);
133 if (get_entity_peculiarity(method) == peculiarity_inherited) {
134 entity *impl_ent = get_inherited_methods_implementation(method);
135 assert(impl_ent && "no implementation for inherited entity");
136 if (get_entity_visibility(impl_ent) == visibility_external_allocated) {
137 assert(get_entity_irg(impl_ent) == NULL);
140 assert(get_entity_irg(impl_ent) != NULL);
141 if (!eset_contains(set, impl_ent)) {
142 eset_insert(set, impl_ent);
147 /** recursive descent **/
148 for (i = get_entity_n_overwrittenby(method) - 1; i >= 0; --i)
149 collect_impls(get_entity_overwrittenby(method, i), set, size, open);
153 /** Alle Methoden bestimmen, die die übergebene Methode überschreiben
154 * (und implementieren). In der zurückgegebenen Reihung kommt jede
155 * Methode nur einmal vor. Der Wert 'NULL' steht für unbekannte
156 * (externe) Methoden. Die zurückgegebene Reihung muß vom Aufrufer
157 * wieder freigegeben werden (siehe "DEL_ARR_F"). Gibt es überhaupt
158 * keine Methoden, die "method" überschreiben, so gibt die Methode
163 static entity ** get_impl_methods(entity * method) {
164 eset * set = eset_create();
169 /* Collect all method entities that can be called here */
170 collect_impls(method, set, &size, &open);
172 /* Vorgaenger einfuegen. */
173 if (size == 0 && !open) {
174 /* keine implementierte überschriebene Methode */
178 arr = NEW_ARR_F(entity *, size + 1);
179 arr[0] = NULL; /* Represents open method */
180 for (ent = eset_first(set); size > 0; ent = eset_next(set), --size)
184 arr = NEW_ARR_F(entity *, size);
185 for (size -= 1, ent = eset_first(set); size >= 0; ent = eset_next(set), --size)
193 /* debug makros used in sel_methods_walker */
194 #define SIZ(x) sizeof(x)/sizeof((x)[0])
196 #define DBG_OPT_NORMALIZE \
197 __dbg_info_merge_pair(new_node, node, dbg_const_eval)
198 #define DBG_OPT_POLY_ALLOC \
202 ons[1] = skip_Proj(get_Sel_ptr(node)); \
203 __dbg_info_merge_sets(&new_node, 1, ons, SIZ(ons), dbg_rem_poly_call); \
205 #define DBG_OPT_POLY \
206 __dbg_info_merge_pair(new_node, node, dbg_rem_poly_call)
210 /** Analyse address computations.
212 * - If the node is a SymConst replace it by Const(ent) if possible.
213 * - If the node is a Sel:
214 * * If the pointer to the Sel comes directly from an Alloc node
215 * replace the Sel by a Const(ent).
218 * @param node The node to analyze
219 * @param ldname_map A map that mapps names of entities to the entities.
221 static void sel_methods_walker(ir_node * node, pmap * ldname_map) {
223 if (get_irn_op(node) == op_SymConst) {
224 /* Wenn möglich SymConst-Operation durch Const-Operation
226 if (get_SymConst_kind(node) == symconst_addr_name) {
227 pmap_entry * entry = pmap_find(ldname_map, (void *) get_SymConst_name(node));
228 if (entry != NULL) { /* Method is declared in the compiled code */
229 entity * ent = entry->value;
230 if (get_opt_normalize() && (get_entity_visibility(ent) != visibility_external_allocated)) { /* Meth. is defined */
233 assert(get_entity_irg(ent));
235 set_irg_current_block(current_ir_graph, get_nodes_Block(node));
236 new_node = new_d_SymConst(get_irn_dbg_info(node), sym, symconst_addr_ent); DBG_OPT_NORMALIZE;
238 exchange(node, new_node);
242 } else if (get_irn_op(node) == op_Sel &&
243 is_method_type(get_entity_type(get_Sel_entity(node)))) {
244 entity * ent = get_Sel_entity(node);
245 if (get_opt_optimize() && get_opt_dyn_meth_dispatch() &&
246 (get_irn_op(skip_Proj(get_Sel_ptr(node))) == op_Alloc)) {
249 /* We know which method will be called, no dispatch necessary. */
251 assert(get_entity_peculiarity(ent) != peculiarity_description);
252 set_irg_current_block(current_ir_graph, get_nodes_Block(node));
253 /* @@@ Is this correct?? Alloc could reference a subtype of the owner
254 of Sel that overwrites the method referenced in Sel. */
255 /* @@@ Yes, this is wrong. GL, 10.3.04 */
256 new_node = copy_const_value(get_atomic_ent_value(ent)); DBG_OPT_POLY_ALLOC;
258 called_ent = resolve_ent_polymorphy(get_Alloc_type(skip_Proj(get_Sel_ptr(node))), ent);
259 set_irg_current_block(current_ir_graph, get_nodes_Block(node));
260 /* called_ent may not be description: has no Address/Const to Call! */
261 assert(get_entity_peculiarity(called_ent) != peculiarity_description);
262 new_node = copy_const_value(get_atomic_ent_value(called_ent)); DBG_OPT_POLY_ALLOC;
264 exchange (node, new_node);
266 assert(get_entity_peculiarity(ent) != peculiarity_inherited);
267 if (!eset_contains(entities, ent)) {
268 /* Entity noch nicht behandelt. Alle (intern oder extern)
269 * implementierten Methoden suchen, die diese Entity
270 * überschreiben. Die Menge an entity.link speichern. */
271 set_entity_link(ent, get_impl_methods(ent));
272 eset_insert(entities, ent);
274 if (get_entity_link(ent) == NULL) {
275 /* Die Sel-Operation kann nie einen Zeiger auf eine aufrufbare
276 * Methode zurückgeben. Damit ist sie insbesondere nicht
277 * ausführbar und nicht erreichbar. */
278 /* Gib eine Warnung aus wenn die Entitaet eine Beschreibung ist
279 fuer die es keine Implementierung gibt. */
280 if (get_entity_peculiarity(ent) == peculiarity_description) {
281 /* @@@ GL Methode um Fehler anzuzeigen aufrufen! */
282 printf("WARNING: Calling method description %s\n in method %s\n of class %s\n which has "
283 "no implementation!\n", get_entity_name(ent),
284 get_entity_name(get_irg_ent(current_ir_graph)),
285 get_type_name(get_entity_owner(get_irg_ent(current_ir_graph))));
286 printf("This happens when compiling a Java Interface that's never really used, i.e., "
287 "no class implementing the interface is ever used.\n");
289 exchange(node, new_Bad());
292 entity ** arr = get_entity_link(ent);
296 printf("\nCall site "); DDMN(node);
297 printf(" in "); DDME(get_irg_ent(current_ir_graph));
298 printf(" can call:\n");
299 for (i = 0; i < ARR_LEN(arr); i++) {
300 printf(" - "); DDME(arr[i]);
301 printf(" with owner "); DDMT(get_entity_owner(arr[i]));
306 if (get_opt_optimize() && get_opt_dyn_meth_dispatch() &&
307 (ARR_LEN(arr) == 1 && arr[0] != NULL)) {
309 /* Die Sel-Operation kann immer nur einen Wert auf eine
310 * interne Methode zurückgeben. Wir können daher die
311 * Sel-Operation durch eine Const- bzw. SymConst-Operation
313 set_irg_current_block(current_ir_graph, get_nodes_Block(node));
314 /* assert(get_entity_peculiarity(tarval_to_entity(get_Const_tarval(get_atomic_ent_value(arr[0])))) == peculiarity_existent); */
315 new_node = copy_const_value(get_atomic_ent_value(arr[0])); DBG_OPT_POLY;
316 exchange (node, new_node);
324 /** Datenstruktur initialisieren. Zusätzlich werden alle
325 * SymConst-Operationen, die auf interne Methoden verweisen, durch
326 * Const-Operationen ersetzt. */
327 static void sel_methods_init(void) {
329 pmap * ldname_map = pmap_create(); /* Map entitiy names to entities: to replace SymConst by Const(ent). */
330 assert(entities == NULL);
331 entities = eset_create();
332 for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
333 entity * ent = get_irg_ent(get_irp_irg(i));
334 /* Nur extern sichtbare Methode können überhaupt mit SymConst
335 * aufgerufen werden. */
336 if (get_entity_visibility(ent) != visibility_local) {
337 pmap_insert(ldname_map, (void *) get_entity_ld_ident(ent), ent);
340 all_irg_walk((irg_walk_func *) sel_methods_walker, NULL, ldname_map);
341 pmap_destroy(ldname_map);
344 /*****************************************************************************/
346 /* Datenstruktur freigeben. */
347 static void sel_methods_dispose(void) {
350 for (ent = eset_first(entities); ent; ent = eset_next(entities)) {
351 entity ** arr = get_entity_link(ent);
355 set_entity_link(ent, NULL);
357 eset_destroy(entities);
362 /* Gibt die Menge aller Methoden zurück, die an diesem Sel-Knoten
363 * zurückgegeben werden können. Die Liste enthält keine doppelten
365 static entity ** get_Sel_arr(ir_node * sel) {
366 static entity ** NULL_ARRAY = NULL;
369 assert(sel && get_irn_op(sel) == op_Sel);
370 ent = get_Sel_entity(sel);
371 assert(is_method_type(get_entity_type(ent))); /* what else? */
372 arr = get_entity_link(ent);
376 /* "NULL" zeigt an, dass keine Implementierung existiert. Dies
377 * kann für polymorphe (abstrakte) Methoden passieren. */
379 NULL_ARRAY = NEW_ARR_F(entity *, 0);
386 static int get_Sel_n_methods(ir_node * sel) {
387 return ARR_LEN(get_Sel_arr(sel));
391 static entity * get_Sel_method(ir_node * sel, int pos) {
392 entity ** arr = get_Sel_arr(sel);
393 assert(pos >= 0 && pos < ARR_LEN(arr));
399 /* --- callee analysis ------------------------------------------------------ */
402 static void callee_ana_node(ir_node * node, eset * methods);
405 static void callee_ana_proj(ir_node * node, long n, eset * methods) {
406 assert(get_irn_mode(node) == mode_T);
407 if (get_irn_link(node) == MARK) {
408 /* already visited */
411 set_irn_link(node, MARK);
413 switch (get_irn_opcode(node)) {
415 /* proj_proj: in einem "sinnvollen" Graphen kommt jetzt ein
416 * op_Tuple oder ein Knoten, der eine "freie Methode"
418 ir_node * pred = get_Proj_pred(node);
419 if (get_irn_link(pred) != MARK) {
420 if (get_irn_op(pred) == op_Tuple) {
421 callee_ana_proj(get_Tuple_pred(pred, get_Proj_proj(node)), n, methods);
423 eset_insert(methods, MARK); /* free method -> unknown */
430 callee_ana_node(get_Tuple_pred(node, n), methods);
434 callee_ana_proj(get_Id_pred(node), n, methods);
438 eset_insert(methods, MARK); /* free method -> unknown */
442 set_irn_link(node, NULL);
446 static void callee_ana_node(ir_node * node, eset * methods) {
449 assert(mode_is_reference(get_irn_mode(node)) || is_Bad(node));
450 /* rekursion verhindern */
451 if (get_irn_link(node) == MARK) {
452 /* already visited */
455 set_irn_link(node, MARK);
457 switch (get_irn_opcode(node)) {
459 if (get_SymConst_kind(node) == symconst_addr_ent) {
460 entity * ent = get_SymConst_entity(node);
461 assert(ent && is_method_type(get_entity_type(ent)));
462 if (get_entity_visibility(ent) != visibility_external_allocated) {
463 assert(get_entity_irg(ent));
464 eset_insert(methods, ent);
466 eset_insert(methods, MARK); /* free method -> unknown */
469 assert(get_SymConst_kind(node) == symconst_addr_name);
470 /* externe Methode (wegen fix_symconst!) */
471 eset_insert(methods, MARK); /* free method -> unknown */
476 /* interne Methode */
477 entity * ent = get_tarval_entity(get_Const_tarval(node));
478 assert(ent && is_method_type(get_entity_type(ent)));
479 if (get_entity_visibility(ent) != visibility_external_allocated) {
480 if (!get_entity_irg(ent)) {
482 assert(get_entity_irg(ent));
484 eset_insert(methods, ent);
486 eset_insert(methods, MARK); /* free method -> unknown */
492 /* polymorphe Methode */
493 for (i = get_Sel_n_methods(node) - 1; i >= 0; --i) {
494 entity * ent = get_Sel_method(node, i);
496 eset_insert(methods, ent);
498 eset_insert(methods, MARK);
507 case iro_Phi: /* Vereinigung */
508 for (i = get_Phi_n_preds(node) - 1; i >= 0; --i) {
509 callee_ana_node(get_Phi_pred(node, i), methods);
514 callee_ana_node(get_Id_pred(node), methods);
518 callee_ana_proj(get_Proj_pred(node), get_Proj_proj(node), methods);
525 eset_insert(methods, MARK); /* free method -> unknown */
529 assert(0 && "invalid opcode or opcode not implemented");
533 set_irn_link(node, NULL);
537 static void callee_walker(ir_node * call, void * env) {
538 if (get_irn_op(call) == op_Call) {
539 eset * methods = eset_create();
541 entity ** arr = NEW_ARR_F(entity *, 0);
542 callee_ana_node(skip_nop(get_Call_ptr(call)), methods);
543 if (eset_contains(methods, MARK)) { /* unknown method */
544 ARR_APP1(entity *, arr, NULL);
546 for (ent = eset_first(methods); ent; ent = eset_next(methods)) {
548 ARR_APP1(entity *, arr, ent);
551 if (ARR_LEN(arr) == 0) {
552 /* Kann vorkommen, wenn der Vorgänger beispielsweise eine
553 * Sel-Operation war, die keine Methoden zurückgeben
554 * konnte. Wir ersetzen die Call-Operation ebenfalls durch
555 * eine Bad-Operation. Die Verlinkung muss wiederhergestellt
557 /* exchange(call, new_Bad()); invalid firm */
559 ir_node *mem = get_Call_mem(call);
560 turn_into_tuple (call, 5 /* pn_Call_max */);
561 set_Tuple_pred(call, pn_Call_M_regular , mem);
562 set_Tuple_pred(call, pn_Call_T_result , new_Bad());
563 set_Tuple_pred(call, pn_Call_P_value_res_base, new_Bad());
564 set_Tuple_pred(call, pn_Call_X_except , new_Bad()); /* new_Jmp() ?? new_Raise() ?? */
565 set_Tuple_pred(call, pn_Call_M_except , mem);
568 set_Call_callee_arr(call, ARR_LEN(arr), arr);
571 eset_destroy(methods);
576 /* Bestimmt für jede Call-Operation die Menge der aufrufbaren Methode
577 * und speichert das Ergebnis in der Call-Operation. (siehe
578 * "set_Call_callee"). "sel_methods" wird für den Aufbau benötigt und
579 * muss bereits aufgebaut sein. */
580 static void callee_ana(void) {
582 /* Alle Graphen analysieren. */
583 for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
584 irg_walk_graph(get_irp_irg(i), callee_walker, NULL, NULL);
585 set_irg_callee_info_state(get_irp_irg(i), irg_callee_info_consistent);
591 /* --- free method analysis ------------------------------------------------- */
594 static void free_mark(ir_node * node, eset * set);
596 static void free_mark_proj(ir_node * node, long n, eset * set) {
597 assert(get_irn_mode(node) == mode_T);
598 if (get_irn_link(node) == MARK) {
599 /* already visited */
602 set_irn_link(node, MARK);
603 switch (get_irn_opcode(node)) {
605 /* proj_proj: in einem "sinnvollen" Graphen kommt jetzt ein
606 * op_Tuple oder ein Knoten, der in "free_ana_walker" behandelt
608 ir_node * pred = get_Proj_pred(node);
609 if (get_irn_link(pred) != MARK && get_irn_op(pred) == op_Tuple) {
610 free_mark_proj(get_Tuple_pred(pred, get_Proj_proj(node)), n, set);
612 /* nothing: da in "free_ana_walker" behandelt. */
618 free_mark(get_Tuple_pred(node, n), set);
622 free_mark_proj(get_Id_pred(node), n, set);
628 /* nothing: Die Operationen werden in "free_ana_walker" selbst
633 assert(0 && "unexpected opcode or opcode not implemented");
636 set_irn_link(node, NULL);
640 static void free_mark(ir_node * node, eset * set) {
642 assert(mode_is_reference(get_irn_mode(node)));
643 if (get_irn_link(node) == MARK) {
644 return; /* already visited */
646 set_irn_link(node, MARK);
647 switch (get_irn_opcode(node)) {
649 entity * ent = get_Sel_entity(node);
650 if (is_method_type(get_entity_type(ent))) {
651 for (i = get_Sel_n_methods(node) - 1; i >= 0; --i) {
652 eset_insert(set, get_Sel_method(node, i));
658 if (get_SymConst_kind(node) == symconst_addr_ent) {
659 entity * ent = get_SymConst_entity(node);
660 if (is_method_type(get_entity_type(ent))) {
661 eset_insert(set, ent);
664 assert(get_SymConst_kind(node) == symconst_addr_name);
665 /* nothing: SymConst points to extern method */
669 tarval * val = get_Const_tarval(node);
670 if (tarval_is_entity(val)) { /* filter null pointer */
671 entity * ent = get_tarval_entity(val);
672 if (is_method_type(get_entity_type(ent))) {
673 eset_insert(set, ent);
679 for (i = get_Phi_n_preds(node) - 1; i >= 0; --i) {
680 free_mark(get_Phi_pred(node, i), set);
684 free_mark(get_Id_pred(node), set);
687 free_mark_proj(get_Proj_pred(node), get_Proj_proj(node), set);
690 /* nothing: Wird unten behandelt! */
693 set_irn_link(node, NULL);
697 static void free_ana_walker(ir_node * node, eset * set) {
699 if (get_irn_link(node) == MARK) {
700 /* bereits in einem Zyklus besucht. */
703 switch (get_irn_opcode(node)) {
714 /* Sonderbehandlung, da der Funktionszeigereingang natürlich kein
717 set_irn_link(node, MARK);
718 for (i = get_Call_arity(node) - 1; i >= 0; --i) {
719 ir_node * pred = get_Call_param(node, i);
720 if (mode_is_reference(get_irn_mode(pred))) {
721 free_mark(pred, set);
725 /* other nodes: Alle anderen Knoten nehmen wir als Verräter an, bis
726 * jemand das Gegenteil implementiert. */
728 set_irn_link(node, MARK);
729 for (i = get_irn_arity(node) - 1; i >= 0; --i) {
730 ir_node * pred = get_irn_n(node, i);
731 if (mode_is_reference(get_irn_mode(pred))) {
732 free_mark(pred, set);
737 set_irn_link(node, NULL);
741 /* Die Datenstrukturen für sel-Methoden (sel_methods) muß vor dem
742 * Aufruf von "get_free_methods" aufgebaut sein. Die (internen)
743 * SymConst-Operationen müssen in passende Const-Operationen
744 * umgewandelt worden sein, d.h. SymConst-Operationen verweisen immer
745 * auf eine echt externe Methode. */
746 static entity ** get_free_methods(int whole)
748 eset * set = eset_create();
750 entity ** arr = NEW_ARR_F(entity *, 0);
754 for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
755 ir_graph * irg = get_irp_irg(i);
756 entity * ent = get_irg_ent(irg);
757 /* insert "external visible" methods. */
758 if (get_entity_visibility(ent) != visibility_local) {
759 eset_insert(set, ent);
761 /* Finde alle Methoden die in dieser Methode extern sichtbar werden,
762 z.B. da die Adresse einer Methode abgespeichert wird. */
763 irg_walk_graph(irg, NULL, (irg_walk_func *) free_ana_walker, set);
767 /* insert sticky methods, too */
768 for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
769 ir_graph * irg = get_irp_irg(i);
770 entity * ent = get_irg_ent(irg);
771 /* insert "external visible" methods. */
772 if (get_entity_stickyness (ent) == stickyness_sticky) {
773 eset_insert(set, ent);
777 /* Hauptprogramm ist auch dann frei, wenn es nicht "external
779 if (get_irp_main_irg()) {
780 eset_insert(set, get_irg_ent(get_irp_main_irg()));
782 /* Wandle Menge in Feld um. Effizienter. */
783 for (ent = eset_first(set); ent; ent = eset_next(set)) {
784 ARR_APP1(entity *, arr, ent);
791 void cgana(int *length, entity ***free_methods, int whole) {
792 entity ** free_meths;
796 free_meths = get_free_methods(whole);
798 sel_methods_dispose();
800 /* Convert the flexible array to an array that can be handled
802 *length = ARR_LEN(free_meths);
803 *free_methods = (entity **)malloc(sizeof(entity *) * (*length));
804 for (i = 0; i < (*length); i++) (*free_methods)[i] = free_meths[i];
805 DEL_ARR_F(free_meths);
810 static void destruct_walker(ir_node * node, void * env) {
811 if (get_irn_op(node) == op_Call) {
812 remove_Call_callee_arr(node);
816 void free_callee_info(ir_graph *irg) {
817 irg_walk_graph(irg, destruct_walker, NULL, NULL);
818 set_irg_callee_info_state(irg, irg_callee_info_none);
822 /* Optimize the address expressions passed to call nodes.
824 * This optimization performs the following transformations for
826 * - All SymConst operations that refer to intern methods are replaced
827 * by Const operations refering to the corresponding entity.
828 * - Sel nodes, that select entities that are not overwritten are
829 * replaced by Const nodes refering to the selected entity.
830 * - Sel nodes, for witch no method exists at all are replaced by Bad
832 * - Sel nodes with a pointer input that is an Alloc node are replaced
833 * by Const nodes refering to the entity that implements the method in
834 * the type given by the Alloc node.
836 void opt_call_addrs(void) {
838 sel_methods_dispose();
841 pmap * ldname_map = pmap_create();
842 assert(entities == NULL);
843 entities = eset_create();
844 for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
845 entity * ent = get_irg_ent(get_irp_irg(i));
846 /* Nur extern sichtbare Methoden können überhaupt mit SymConst
847 * aufgerufen werden. */
848 if (get_entity_visibility(ent) != local) {
849 pmap_insert(ldname_map, (void *) get_entity_ld_ident(ent), ent);
852 all_irg_walk((irg_walk_func *) sel_methods_walker, NULL, ldname_map);
853 pmap_destroy(ldname_map);