2 * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief Memory disambiguator
23 * @author Michael Beck
34 #include "irgraph_t.h"
45 /** The debug handle. */
46 DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)
48 /** The source language specific language disambiguator function. */
49 static DISAMBIGUATOR_FUNC language_disambuigator = NULL;
51 /** The global memory disambiguator options. */
52 static unsigned global_mem_disamgig_opt = aa_opt_no_opt;
54 /* Get the memory disambiguator options for a graph. */
55 unsigned get_irg_memory_disambiguator_options(ir_graph *irg) {
56 unsigned opt = irg->mem_disambig_opt;
57 if (opt & aa_opt_inherited)
58 return global_mem_disamgig_opt;
60 } /* get_irg_memory_disambiguator_options */
62 /* Set the memory disambiguator options for a graph. */
63 void set_irg_memory_disambiguator_options(ir_graph *irg, unsigned options) {
64 irg->mem_disambig_opt = options & ~aa_opt_inherited;
65 } /* set_irg_memory_disambiguator_options */
67 /* Set the global disambiguator options for all graphs not having local options. */
68 void set_irp_memory_disambiguator_options(unsigned options) {
69 global_mem_disamgig_opt = options;
70 } /* set_irp_memory_disambiguator_options */
73 * Find the base address and entity of an Sel node.
76 * @param pEnt after return points to the base entity.
78 * @return the base address.
80 static ir_node *find_base_adr(ir_node *sel, ir_entity **pEnt) {
81 ir_node *ptr = get_Sel_ptr(sel);
85 ptr = get_Sel_ptr(sel);
87 *pEnt = get_Sel_entity(sel);
92 * Check if the address can be decomposed into base PLUS offset.
94 static int has_offset(ir_node *adr, int *offset) {
95 if (is_SymConst(adr)) {
100 ir_entity *ent = get_Sel_entity(adr);
101 ir_type *owner = get_entity_owner(ent);
103 if (get_type_state(owner) != layout_fixed) {
104 /* The layout is NOT fixed yet, symbolic evaluation needed */
111 * Two address expressions have the same base address,
112 * check if there offsets are different.
114 * @param adr1 The first address.
115 * @param adr2 The second address.
117 static ir_alias_relation different_offsets(ir_node *adr1, ir_node *adr2) {
118 int offset1, offset2;
119 if (has_offset(adr1, &offset1) && has_offset(adr2, &offset2)) {
123 } /* different_offsets */
126 * Check if a given Const node is greater or equal a given size.
128 * @return no_alias if the Const is greater, may_alias else
130 static ir_alias_relation check_const(ir_node *cns, int size) {
131 tarval *tv = get_Const_tarval(cns);
135 return classify_tarval(tv) != TV_CLASSIFY_NULL ? no_alias : may_alias;
136 tv_size = new_tarval_from_long(size, get_tarval_mode(tv));
137 return tarval_cmp(tv_size, tv) & (pn_Cmp_Eq|pn_Cmp_Lt) ? no_alias : may_alias;
141 * Treat idx1 and idx2 as integer indexes and check if they differ always more than size.
143 * @return sure_alias iff idx1 == idx2
144 * no_alias iff they ALWAYS differ more than size
147 static ir_alias_relation different_index(ir_node *idx1, ir_node *idx2, int size) {
150 if (is_Const(idx1) && is_Const(idx2)) {
151 /* both are const, we can compare them */
152 tarval *tv1 = get_Const_tarval(idx1);
153 tarval *tv2 = get_Const_tarval(idx2);
154 tarval *tv, *tv_size;
157 return tv1 == tv2 ? sure_alias : no_alias;
159 if (tarval_cmp(tv1, tv2) == pn_Cmp_Gt) {
164 /* tv1 is now the "smaller" one */
165 tv = tarval_sub(tv2, tv1);
166 tv_size = new_tarval_from_long(size, get_tarval_mode(tv));
167 return tarval_cmp(tv_size, tv) & (pn_Cmp_Eq|pn_Cmp_Lt) ? no_alias : may_alias;
170 /* Note: we rely here on the fact that normalization puts constants on the RIGHT side */
172 ir_node *l1 = get_Add_left(idx1);
173 ir_node *r1 = get_Add_right(idx1);
178 return check_const(r1, size);
181 /* both are Adds, check if they are of x + c kind */
182 ir_node *l2 = get_Add_left(idx2);
183 ir_node *r2 = get_Add_right(idx2);
186 return different_index(r1, r2, size);
188 return different_index(r1, l2, size);
190 return different_index(l1, l2, size);
192 return different_index(l1, r2, size);
196 ir_node *l2 = get_Add_left(idx2);
197 ir_node *r2 = get_Add_right(idx2);
202 return check_const(r2, size);
207 ir_node *l1 = get_Sub_left(idx1);
208 ir_node *r1 = get_Sub_right(idx1);
213 return check_const(r1, size);
217 /* both are Subs, check if they are of x - c kind */
218 ir_node *l2 = get_Sub_left(idx2);
221 ir_node *r2 = get_Sub_right(idx2);
222 return different_index(r1, r2, size);
227 ir_node *l2 = get_Sub_left(idx2);
228 ir_node *r2 = get_Sub_right(idx2);
233 return check_const(r2, size);
238 } /* different_index */
241 * Two Sel addresses have the same base address, check if there offsets are different.
243 * @param adr1 The first address.
244 * @param adr2 The second address.
246 static ir_alias_relation different_sel_offsets(ir_node *sel1, ir_node *sel2) {
247 ir_entity *ent1 = get_Sel_entity(sel1);
248 ir_entity *ent2 = get_Sel_entity(sel2);
249 int i, check_arr = 0;
254 ir_type *tp1 = get_entity_type(ent1);
255 ir_type *tp2 = get_entity_type(ent2);
259 else if (get_type_state(tp1) == layout_fixed && get_type_state(tp2) == layout_fixed &&
260 get_type_size_bytes(tp1) == get_type_size_bytes(tp2))
264 /* we select an entity of same size, check for indexes */
265 int n = get_Sel_n_indexs(sel1);
268 if (n > 0 && n == get_Sel_n_indexs(sel2)) {
269 /* same non-zero number of indexes, an array access, check */
270 for (i = 0; i < n; ++i) {
271 ir_node *idx1 = get_Sel_index(sel1, i);
272 ir_node *idx2 = get_Sel_index(sel2, i);
273 ir_alias_relation res = different_index(idx1, idx2, 0); /* we can safely IGNORE the size here if it's at least >0 */
275 if (res == may_alias)
277 else if (res == no_alias)
280 /* if we have at least one no_alias, there is no alias relation, else we have sure */
281 return have_no > 0 ? no_alias : sure_alias;
285 } /* different_sel_offsets */
288 * Determine the alias relation by checking if adr1 and adr2 are pointer
291 * @param adr1 The first address.
292 * @param adr2 The second address.
294 static ir_alias_relation different_types(ir_node *adr1, ir_node *adr2)
296 ir_entity *ent1 = NULL, *ent2 = NULL;
298 if (is_SymConst(adr1) && get_SymConst_kind(adr1) == symconst_addr_ent)
299 ent1 = get_SymConst_entity(adr1);
300 else if (is_Sel(adr1))
301 ent1 = get_Sel_entity(adr1);
303 if (is_SymConst(adr2) && get_SymConst_kind(adr2) == symconst_addr_ent)
304 ent2 = get_SymConst_entity(adr2);
305 else if (is_Sel(adr2))
306 ent2 = get_Sel_entity(adr2);
308 if (ent1 != NULL && ent2 != NULL) {
309 ir_type *tp1 = get_entity_type(ent1);
310 ir_type *tp2 = get_entity_type(ent2);
313 if (is_Pointer_type(tp1) && is_Pointer_type(tp2)) {
314 /* do deref until no pointer types are found */
316 tp1 = get_pointer_points_to_type(tp1);
317 tp2 = get_pointer_points_to_type(tp2);
318 } while (is_Pointer_type(tp1) && is_Pointer_type(tp2));
321 if (get_type_tpop(tp1) != get_type_tpop(tp2)) {
322 /* different type structure */
325 if (is_Class_type(tp1)) {
326 /* check class hierarchy */
327 if (! is_SubClass_of(tp1, tp2) &&
328 ! is_SubClass_of(tp2, tp1))
331 /* different types */
337 } /* different_types */
340 * Check if an offset is a constant and these constant is bigger or equal
343 static int check_const_offset(ir_node *offset, int size) {
344 ir_mode *mode = get_irn_mode(offset);
346 /* ok, we found an offset, check for constant */
347 if (is_Const(offset) && mode_is_int(mode)) {
348 tarval *tv = new_tarval_from_long(size, mode);
350 /* size <= offset ? */
351 if (tarval_cmp(tv, get_Const_tarval(offset)) & (pn_Cmp_Eq|pn_Cmp_Lt))
355 } /* check_const_offset */
358 * Check if we can determine that the two pointers always have an offset bigger then size
360 static ir_alias_relation _different_pointer(ir_node *adr1, ir_node *adr2, int size) {
364 /* first address is the result of a pointer addition */
365 ir_node *l1 = get_Add_left(adr1);
366 ir_node *r1 = get_Add_right(adr1);
369 found = check_const_offset(r1, size);
370 } else if (r1 == adr2) {
371 found = check_const_offset(l1, size);
372 } else if (is_Add(adr2)) {
373 /* second address is the result of a pointer addition */
374 ir_node *l2 = get_Add_left(adr2);
375 ir_node *r2 = get_Add_right(adr2);
378 return _different_pointer(r1, r2, size);
379 } else if (l1 == r2) {
380 return _different_pointer(r1, l2, size);
381 } else if (r1 == l2) {
382 return _different_pointer(l1, r2, size);
383 } else if (r1 == r2) {
384 return _different_pointer(l1, l2, size);
387 } else if (is_Add(adr2)) {
388 /* second address is the result of a pointer addition */
389 ir_node *l2 = get_Add_left(adr2);
390 ir_node *r2 = get_Add_right(adr2);
393 found = check_const_offset(r2, size);
394 } else if (r2 == adr1) {
395 found = check_const_offset(l2, size);
398 return different_index(adr1, adr2, size);
400 return found ? no_alias : may_alias;
401 } /* _different_pointer */
404 * Check if we can determine that the two pointers always have an offset bigger then the maximum size of mode1, mode2
406 static ir_alias_relation different_pointer(ir_node *adr1, ir_mode *mode1, ir_node *adr2, ir_mode *mode2) {
407 int size = get_mode_size_bytes(mode1);
408 int n = get_mode_size_bytes(mode2);
412 return _different_pointer(adr1, adr2, size);
413 } /* different_pointer */
416 * Returns non-zero if a node is a routine parameter.
418 * @param node the node to test
420 static int is_arg_Proj(ir_node *node) {
423 node = get_Proj_pred(node);
426 return pn_Start_T_args == get_Proj_proj(node) && is_Start(get_Proj_pred(node));
430 * Returns true if an address represents a global variable.
432 static INLINE int is_global_var(ir_node *irn) {
433 return is_SymConst(irn) && get_SymConst_kind(irn) == symconst_addr_ent;
434 } /* is_global_var */
437 * Determine the alias relation between two addresses.
439 static ir_alias_relation _get_alias_relation(
441 ir_node *adr1, ir_mode *mode1,
442 ir_node *adr2, ir_mode *mode2)
445 ir_entity *ent1, *ent2;
448 if (! get_opt_alias_analysis())
454 options = get_irg_memory_disambiguator_options(irg);
456 /* The Armageddon switch */
457 if (options & aa_opt_no_alias)
460 /* Two save some code, sort the addresses by its id's. Beware, this
461 might break some things, so better check here. */
462 assert(iro_SymConst < iro_Sel && iro_Sel < iro_Proj && "Code dependence breaked");
463 op1 = get_irn_opcode(adr1);
464 op2 = get_irn_opcode(adr2);
475 if (is_global_var(adr1)) {
476 /* first address is a global variable */
478 if (is_global_var(adr2)) {
479 /* both addresses are global variables and we know
480 they are different (R1 a) */
481 if (get_SymConst_entity(adr1) != get_SymConst_entity(adr2))
484 /* equal entity addresses */
489 ir_node *base2 = find_base_adr(adr2, &ent2);
491 if (is_global_var(base2)) {
492 /* base2 address is a global var (R1 a) */
496 return different_offsets(adr1, adr2);
497 } else if (base2 == get_irg_frame(irg)) {
498 /* the second one is a local variable so they are always
501 } else if (base2 == get_irg_tls(irg)) {
502 /* the second one is a TLS variable so they are always
508 /* Here we are: the first is a global var, the second some pointer. */
509 ent1 = get_SymConst_entity(adr1);
510 if (get_entity_address_taken(ent1) == ir_address_not_taken) {
511 /* The address of the global variable was never taken, so
512 the pointer cannot match (R2). */
515 } else if (is_Sel(adr1)) {
516 /* the first address is a Sel */
517 ir_node *base1 = find_base_adr(adr1, &ent1);
519 if (base1 == get_irg_frame(irg)) {
520 /* first is a local variable ent1 */
522 /* the second address is a Sel */
523 ir_node *base2 = find_base_adr(adr2, &ent2);
525 if (base1 == base2) {
526 /* identical bases: check for different offsets */
527 return different_sel_offsets(adr1, adr2);
528 } else if (base2 == get_irg_frame(irg)) {
529 /* both addresses are local variables and we know
530 they are different (R1 a) */
533 } else if (base2 == get_irg_tls(irg)) {
534 /* the second one is a TLS variable so they are always
537 } else if (is_arg_Proj(base2)) {
538 /* the second one is an offset from a parameter so they are
539 always different (R1 e) */
542 } else if (is_arg_Proj(adr2)) {
543 /* a local variable and a parameter are always different (R1 e) */
546 } else if (base1 == get_irg_tls(irg)) {
547 /* the first is a TLS variable */
549 /* the second address is a Sel */
550 ir_node *base2 = find_base_adr(adr2, &ent2);
553 return different_sel_offsets(adr1, adr2);
554 else if (base2 == get_irg_frame(irg)) {
555 /* the second one is a local variable so they are always
558 } else if (base2 == get_irg_tls(irg)) {
559 /* both addresses are TLS variables and we know
560 they are different (R1 a) */
565 } else if (is_arg_Proj(base1)) {
566 /* the first one is an offset from a parameter */
568 /* the second address is a Sel */
569 ir_node *base2 = find_base_adr(adr2, &ent2);
571 if (base2 == get_irg_frame(irg)) {
572 /* the second one is a local variable so they are always
577 } else if (is_global_var(base1)) {
578 /* the first one is a global variable */
579 ent1 = get_SymConst_entity(base1);
581 /* the second address is a Sel */
582 ir_node *base2 = find_base_adr(adr2, &ent2);
585 return different_sel_offsets(adr1, adr2);
586 else if (base2 == get_irg_frame(irg)) {
587 /* the second one is a local variable so they are always
590 } else if (base2 == get_irg_tls(irg)) {
591 /* the second one is a TLS variable so they are always
594 } else if (is_arg_Proj(base2)) {
595 if (get_entity_address_taken(ent1) == ir_address_not_taken) {
596 /* The address of the global variable was never taken, so
597 the pointer cannot match (R2). */
600 } else if (is_global_var(base2)) {
601 ent2 = get_SymConst_entity(base2);
602 /* both addresses are global variables and we know
603 they are different (R1 a) */
610 /* some pointers, check if they have the same base buf constant offset */
611 ir_alias_relation rel = different_pointer(adr1, mode1, adr2, mode2);
612 if (rel != may_alias)
617 if (options & aa_opt_type_based) { /* Type based alias analysis */
618 ir_alias_relation rel;
620 if (options & aa_opt_byte_type_may_alias) {
621 if (get_mode_size_bits(mode1) == 8 || get_mode_size_bits(mode2) == 8) {
622 /* One of the modes address a byte. Assume a may_alias and leave
623 the type based check. */
624 goto leave_type_based_alias;
627 /* cheap check: If the mode sizes did not match, the types MUST be different */
628 if (get_mode_size_bits(mode1) != get_mode_size_bits(mode2))
632 rel = different_types(adr1, adr2);
633 if (rel != may_alias)
635 leave_type_based_alias:;
638 /* do we have a language specific memory disambiguator? */
639 if (language_disambuigator) {
640 ir_alias_relation rel = (*language_disambuigator)(irg, adr1, mode1, adr2, mode2);
641 if (rel != may_alias)
645 /* access points-to information here */
647 } /* _get_alias_relation */
650 * Determine the alias relation between two addresses.
652 ir_alias_relation get_alias_relation(
654 ir_node *adr1, ir_mode *mode1,
655 ir_node *adr2, ir_mode *mode2)
657 ir_alias_relation rel = _get_alias_relation(irg, adr1, mode1, adr2, mode2);
659 } /* get_alias_relation */
661 /* Set a source language specific memory disambiguator function. */
662 void set_language_memory_disambiguator(DISAMBIGUATOR_FUNC func) {
663 language_disambuigator = func;
664 } /* set_language_memory_disambiguator */
666 /** The result cache for the memory disambiguator. */
667 static set *result_cache = NULL;
669 /** An entry in the relation cache. */
670 typedef struct mem_disambig_entry {
671 ir_node *adr1; /**< The first address. */
672 ir_node *adr2; /**< The second address. */
673 ir_alias_relation result; /**< The alias relation result. */
674 } mem_disambig_entry;
676 #define HASH_ENTRY(adr1, adr2) (HASH_PTR(adr1) ^ HASH_PTR(adr2))
679 * Compare two relation cache entries.
681 static int cmp_mem_disambig_entry(const void *elt, const void *key, size_t size) {
682 const mem_disambig_entry *p1 = elt;
683 const mem_disambig_entry *p2 = key;
685 return p1->adr1 == p2->adr1 && p1->adr2 == p2->adr2;
686 } /* cmp_mem_disambig_entry */
689 * Initialize the relation cache.
691 void mem_disambig_init(void) {
692 result_cache = new_set(cmp_mem_disambig_entry, 8);
693 } /* mem_disambig_init */
696 * Determine the alias relation between two addresses.
698 ir_alias_relation get_alias_relation_ex(
700 ir_node *adr1, ir_mode *mode1,
701 ir_node *adr2, ir_mode *mode2)
703 mem_disambig_entry key, *entry;
705 if (! get_opt_alias_analysis())
708 if (get_irn_opcode(adr1) > get_irn_opcode(adr2)) {
716 entry = set_find(result_cache, &key, sizeof(key), HASH_ENTRY(adr1, adr2));
718 return entry->result;
720 key.result = get_alias_relation(irg, adr1, mode1, adr2, mode2);
722 set_insert(result_cache, &key, sizeof(key), HASH_ENTRY(adr1, adr2));
724 } /* get_alias_relation_ex */
726 /* Free the relation cache. */
727 void mem_disambig_term(void) {
729 del_set(result_cache);
732 } /* mem_disambig_term */
735 * Check the mode of a Load/Store with the mode of the entity
737 * If the mode of the entity and the Load/Store mode do not match, we
738 * have the bad reinterpret case:
741 * char b = *(char *)&i;
743 * We do NOT count this as one value and return address_taken
745 * However, we support an often used case. If the mode is two-complement
746 * we allow casts between signed/unsigned.
748 * @param mode the mode of the Load/Store
749 * @param ent_mode the mode of the accessed entity
751 * @return non-zero if the Load/Store is a hidden cast, zero else
753 static int is_hidden_cast(ir_mode *mode, ir_mode *ent_mode) {
754 if (ent_mode != mode) {
755 if (ent_mode == NULL ||
756 get_mode_size_bits(ent_mode) != get_mode_size_bits(mode) ||
757 get_mode_sort(ent_mode) != get_mode_sort(mode) ||
758 get_mode_arithmetic(ent_mode) != irma_twos_complement ||
759 get_mode_arithmetic(mode) != irma_twos_complement)
763 } /* is_hidden_cast */
766 * Determine the address_taken state of a node (or it's successor Sels).
768 * @param irn the node
770 static ir_address_taken_state find_address_taken_state(ir_node *irn) {
772 ir_mode *emode, *mode;
776 for (i = get_irn_n_outs(irn) - 1; i >= 0; --i) {
777 ir_node *succ = get_irn_out(irn, i);
779 switch (get_irn_opcode(succ)) {
781 /* check if this load is not a hidden conversion */
782 mode = get_Load_mode(succ);
783 ent = is_SymConst(irn) ? get_SymConst_entity(irn) : get_Sel_entity(irn);
784 emode = get_type_mode(get_entity_type(ent));
785 if (is_hidden_cast(mode, emode))
786 return ir_address_taken;
790 /* check that the node is not the Store's value */
791 value = get_Store_value(succ);
793 return ir_address_taken;
794 /* check if this Store is not a hidden conversion */
795 mode = get_irn_mode(value);
796 ent = is_SymConst(irn) ? get_SymConst_entity(irn) : get_Sel_entity(irn);
797 emode = get_type_mode(get_entity_type(ent));
798 if (is_hidden_cast(mode, emode))
799 return ir_address_taken;
803 /* Check the successor of irn. */
804 ir_address_taken_state res = find_address_taken_state(succ);
805 if (res != ir_address_not_taken)
811 /* Only the call address is not an address taker but
812 this is an uninteresting case, so we ignore it here. */
813 return ir_address_taken;
816 /* another op, the address may be taken */
817 return ir_address_taken_unknown;
820 /* All successors finished, the address is not taken. */
821 return ir_address_not_taken;
822 } /* find_address_taken_state */
825 * Update the "address taken" flag of all frame entities.
827 static void analyse_irg_address_taken(ir_graph *irg) {
828 ir_type *ft = get_irg_frame_type(irg);
832 /* set initial state to not_taken, as this is the "smallest" state */
833 for (i = get_class_n_members(ft) - 1; i >= 0; --i) {
834 ir_entity *ent = get_class_member(ft, i);
836 set_entity_address_taken(ent, ir_address_not_taken);
839 assure_irg_outs(irg);
841 irg_frame = get_irg_frame(irg);
843 for (i = get_irn_n_outs(irg_frame) - 1; i >= 0; --i) {
844 ir_node *succ = get_irn_out(irg_frame, i);
845 ir_address_taken_state state;
848 ir_entity *ent = get_Sel_entity(succ);
850 if (get_entity_address_taken(ent) == ir_address_taken)
853 state = find_address_taken_state(succ);
854 if (state > get_entity_address_taken(ent))
855 set_entity_address_taken(ent, state);
859 irg->adr_taken_state = ir_address_taken_computed;
860 } /* analyse_address_taken */
862 /* Returns the current address taken state of the graph. */
863 ir_address_taken_computed_state get_irg_address_taken_state(const ir_graph *irg) {
864 return irg->adr_taken_state;
865 } /* get_irg_address_taken_state */
867 /* Sets the current address taken state of the graph. */
868 void set_irg_address_taken_state(ir_graph *irg, ir_address_taken_computed_state state) {
869 irg->adr_taken_state = state;
870 } /* set_irg_address_taken_state */
872 /* Assure that the address taken flag is computed for the given graph. */
873 void assure_irg_address_taken_computed(ir_graph *irg) {
874 if (irg->adr_taken_state == ir_address_taken_not_computed)
875 analyse_irg_address_taken(irg);
876 } /* assure_irg_address_taken_computed */
879 * Initialize the address_taken flag for a global type like type.
881 static void init_taken_flag(ir_type * tp) {
884 /* All external visible entities are at least
885 ir_address_taken_unknown. This is very conservative. */
886 for (i = get_compound_n_members(tp) - 1; i >= 0; --i) {
887 ir_entity *ent = get_compound_member(tp, i);
888 ir_address_taken_state state;
890 state = get_entity_visibility(ent) == visibility_external_visible ?
891 ir_address_taken_unknown : ir_address_not_taken ;
892 set_entity_address_taken(ent, state);
894 } /* init_taken_flag */
898 * Print the address taken state of all entities of a given type for debugging.
900 static void print_address_taken_state(ir_type *tp) {
902 for (i = get_compound_n_members(tp) - 1; i >= 0; --i) {
903 ir_entity *ent = get_compound_member(tp, i);
904 ir_address_taken_state state = get_entity_address_taken(ent);
906 if (state != ir_address_not_taken) {
907 assert(ir_address_not_taken <= state && state <= ir_address_taken);
908 ir_printf("%+F: %s\n", ent, get_address_taken_state_name(state));
911 } /* print_address_taken_state */
912 #endif /* DEBUG_libfirm */
915 * Post-walker: check for global entity address
917 static void check_global_address(ir_node *irn, void *env) {
920 ir_address_taken_state state;
922 if (is_SymConst(irn) && get_SymConst_kind(irn) == symconst_addr_ent) {
924 ent = get_SymConst_entity(irn);
925 } else if (is_Sel(irn) && get_Sel_ptr(irn) == tls) {
926 /* A TLS variable. */
927 ent = get_Sel_entity(irn);
931 if (get_entity_address_taken(ent) >= ir_address_taken) {
932 /* Already at the maximum. */
935 state = find_address_taken_state(irn);
936 if (state > get_entity_address_taken(ent))
937 set_entity_address_taken(ent, state);
938 } /* check_global_address */
941 * Update the "address taken" flag of all global entities.
943 static void analyse_irp_globals_address_taken(void) {
946 FIRM_DBG_REGISTER(dbg, "firm.ana.irmemory");
948 init_taken_flag(get_glob_type());
949 init_taken_flag(get_tls_type());
951 for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
952 ir_graph *irg = get_irp_irg(i);
954 assure_irg_outs(irg);
955 irg_walk_graph(irg, NULL, check_global_address, get_irg_tls(irg));
959 if (firm_dbg_get_mask(dbg) & LEVEL_1) {
960 print_address_taken_state(get_glob_type());
961 print_address_taken_state(get_tls_type());
963 #endif /* DEBUG_libfirm */
966 irp->globals_adr_taken_state = ir_address_taken_computed;
967 } /* analyse_irp_globals_address_taken */
969 /* Returns the current address taken state of the globals. */
970 ir_address_taken_computed_state get_irp_globals_address_taken_state(void) {
971 return irp->globals_adr_taken_state;
972 } /* get_irp_globals_address_taken_state */
974 /* Sets the current address taken state of the graph. */
975 void set_irp_globals_address_taken_state(ir_address_taken_computed_state state) {
976 irp->globals_adr_taken_state = state;
977 } /* set_irg_address_taken_state */
979 /* Assure that the address taken flag is computed for the globals. */
980 void assure_irp_globals_address_taken_computed(void) {
981 if (irp->globals_adr_taken_state == ir_address_taken_not_computed)
982 analyse_irp_globals_address_taken();
983 } /* assure_irp_globals_address_taken_computed */