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 * idx1 and idx2 represent two integer indexes. Check if they could be classified
128 static ir_alias_relation different_index(ir_node *idx1, ir_node *idx2) {
129 ir_alias_relation res = may_alias;
133 if (is_Const(idx1) && is_Const(idx2)) {
134 /* both are const, we can compare them */
135 return get_Const_tarval(idx1) == get_Const_tarval(idx2) ? sure_alias : no_alias;
138 /* Note: we rely here on the fact that normalization puts constants on the RIGHT side */
140 ir_node *l1 = get_Add_left(idx1);
141 ir_node *r1 = get_Add_right(idx1);
146 return classify_Const(r1) == CNST_NULL ? sure_alias : no_alias;
150 /* both are Adds, check if they are of x + c kind */
151 ir_node *l2 = get_Add_left(idx2);
152 ir_node *r2 = get_Add_right(idx2);
155 res = different_index(r1, r2);
157 res = different_index(r1, l2);
159 res = different_index(l1, l2);
161 res = different_index(l1, r2);
162 if (res != may_alias)
167 ir_node *l2 = get_Add_left(idx2);
168 ir_node *r2 = get_Add_right(idx2);
173 return classify_Const(r2) == CNST_NULL ? sure_alias : no_alias;
179 ir_node *l1 = get_Sub_left(idx1);
180 ir_node *r1 = get_Sub_right(idx1);
185 return classify_Const(r1) == CNST_NULL ? sure_alias : no_alias;
190 /* both are Subs, check if they are of x - c kind */
191 ir_node *l2 = get_Sub_left(idx2);
194 ir_node *r2 = get_Sub_right(idx2);
195 res = different_index(r1, r2);
198 if (res != may_alias)
202 ir_node *l2 = get_Sub_left(idx2);
203 ir_node *r2 = get_Sub_right(idx2);
208 return classify_Const(r2) == CNST_NULL ? sure_alias : no_alias;
214 } /* different_index */
217 * Two Sel addresses have the same base address, check if there offsets are different.
219 * @param adr1 The first address.
220 * @param adr2 The second address.
222 static ir_alias_relation different_sel_offsets(ir_node *sel1, ir_node *sel2) {
223 ir_entity *ent1 = get_Sel_entity(sel1);
224 ir_entity *ent2 = get_Sel_entity(sel2);
225 int i, check_arr = 0;
230 ir_type *tp1 = get_entity_type(ent1);
231 ir_type *tp2 = get_entity_type(ent2);
235 else if (get_type_state(tp1) == layout_fixed && get_type_state(tp2) == layout_fixed &&
236 get_type_size_bytes(tp1) == get_type_size_bytes(tp2))
240 /* we select an entity of same size, check for indexes */
241 int n = get_Sel_n_indexs(sel1);
244 if (n > 0 && n == get_Sel_n_indexs(sel2)) {
245 /* same non-zero number of indexes, an array access, check */
246 for (i = 0; i < n; ++i) {
247 ir_node *idx1 = get_Sel_index(sel1, i);
248 ir_node *idx2 = get_Sel_index(sel2, i);
249 ir_alias_relation res = different_index(idx1, idx2);
251 if (res == may_alias)
253 else if (res == no_alias)
256 /* if we have at least one no_alias, there is no alias relation, else we have sure */
257 return have_no > 0 ? no_alias : sure_alias;
261 } /* different_sel_offsets */
264 * Determine the alias relation by checking if adr1 and adr2 are pointer
267 * @param adr1 The first address.
268 * @param adr2 The second address.
270 static ir_alias_relation different_types(ir_node *adr1, ir_node *adr2)
272 ir_entity *ent1 = NULL, *ent2 = NULL;
274 if (is_SymConst(adr1) && get_SymConst_kind(adr1) == symconst_addr_ent)
275 ent1 = get_SymConst_entity(adr1);
276 else if (is_Sel(adr1))
277 ent1 = get_Sel_entity(adr1);
279 if (is_SymConst(adr2) && get_SymConst_kind(adr2) == symconst_addr_ent)
280 ent2 = get_SymConst_entity(adr2);
281 else if (is_Sel(adr2))
282 ent2 = get_Sel_entity(adr2);
284 if (ent1 != NULL && ent2 != NULL) {
285 ir_type *tp1 = get_entity_type(ent1);
286 ir_type *tp2 = get_entity_type(ent2);
289 if (is_Pointer_type(tp1) && is_Pointer_type(tp2)) {
290 /* do deref until no pointer types are found */
292 tp1 = get_pointer_points_to_type(tp1);
293 tp2 = get_pointer_points_to_type(tp2);
294 } while (is_Pointer_type(tp1) && is_Pointer_type(tp2));
297 if (get_type_tpop(tp1) != get_type_tpop(tp2)) {
298 /* different type structure */
301 if (is_Class_type(tp1)) {
302 /* check class hierarchy */
303 if (! is_SubClass_of(tp1, tp2) &&
304 ! is_SubClass_of(tp2, tp1))
307 /* different types */
313 } /* different_types */
316 * Check if a offset is constant and bigger than a given size
318 static int check_const_offset(ir_node *offset, int size) {
319 ir_mode *mode = get_irn_mode(offset);
321 /* ok, we found an offset, check for constant */
322 if (is_Const(offset) && mode_is_int(mode)) {
323 tarval *tv = new_tarval_from_long(size, mode);
325 if (tarval_cmp(tv, get_Const_tarval(offset)) & (pn_Cmp_Eq|pn_Cmp_Gt))
329 } /* check_const_offset */
332 * Check if we can determine that the two pointers always have an offset bigger then size
334 static ir_alias_relation _different_pointer(ir_node *adr1, ir_node *adr2, int size) {
338 /* first address is the result of a pointer addition */
339 ir_node *l1 = get_Add_left(adr1);
340 ir_node *r1 = get_Add_right(adr1);
343 found = check_const_offset(r1, size);
344 } else if (r1 == adr2) {
345 found = check_const_offset(l1, size);
346 } else if (is_Add(adr2)) {
347 /* second address is the result of a pointer addition */
348 ir_node *l2 = get_Add_left(adr2);
349 ir_node *r2 = get_Add_right(adr2);
352 return _different_pointer(r1, r2, size);
353 } else if (l1 == r2) {
354 return _different_pointer(r1, l2, size);
355 } else if (r1 == l2) {
356 return _different_pointer(l1, r2, size);
357 } else if (r1 == r2) {
358 return _different_pointer(l1, l2, size);
361 } else if (is_Add(adr2)) {
362 /* second address is the result of a pointer addition */
363 ir_node *l2 = get_Add_left(adr2);
364 ir_node *r2 = get_Add_right(adr2);
367 found = check_const_offset(r2, size);
368 } else if (r2 == adr1) {
369 found = check_const_offset(l2, size);
372 return found ? no_alias : may_alias;
373 } /* _different_pointer */
376 * Check if we can determine that the two pointers always have an offset bigger then the maximum size of mode1, mode2
378 static ir_alias_relation different_pointer(ir_node *adr1, ir_mode *mode1, ir_node *adr2, ir_mode *mode2) {
379 int size = get_mode_size_bytes(mode1);
380 int n = get_mode_size_bytes(mode2);
384 return _different_pointer(adr1, adr2, size);
385 } /* different_pointer */
388 * Returns non-zero if a node is a routine parameter.
390 * @param node the node to test
392 static int is_arg_Proj(ir_node *node) {
395 node = get_Proj_pred(node);
398 return pn_Start_T_args == get_Proj_proj(node) && is_Start(get_Proj_pred(node));
402 * Returns true if an address represents a global variable.
404 static INLINE int is_global_var(ir_node *irn) {
405 return is_SymConst(irn) && get_SymConst_kind(irn) == symconst_addr_ent;
406 } /* is_global_var */
409 * Determine the alias relation between two addresses.
411 static ir_alias_relation _get_alias_relation(
413 ir_node *adr1, ir_mode *mode1,
414 ir_node *adr2, ir_mode *mode2)
417 ir_entity *ent1, *ent2;
420 if (! get_opt_alias_analysis())
426 options = get_irg_memory_disambiguator_options(irg);
428 /* The Armageddon switch */
429 if (options & aa_opt_no_alias)
432 /* Two save some code, sort the addresses by its id's. Beware, this
433 might break some things, so better check here. */
434 assert(iro_SymConst < iro_Sel && iro_Sel < iro_Proj && "Code dependence breaked");
435 op1 = get_irn_opcode(adr1);
436 op2 = get_irn_opcode(adr2);
447 if (is_global_var(adr1)) {
448 /* first address is a global variable */
450 if (is_global_var(adr2)) {
451 /* both addresses are global variables and we know
452 they are different (R1 a) */
453 if (get_SymConst_entity(adr1) != get_SymConst_entity(adr2))
456 /* equal entity addresses */
461 ir_node *base2 = find_base_adr(adr2, &ent2);
463 if (is_global_var(base2)) {
464 /* base2 address is a global var (R1 a) */
468 return different_offsets(adr1, adr2);
469 } else if (base2 == get_irg_frame(irg)) {
470 /* the second one is a local variable so they are always
473 } else if (base2 == get_irg_tls(irg)) {
474 /* the second one is a TLS variable so they are always
480 /* Here we are: the first is a global var, the second some pointer. */
481 ent1 = get_SymConst_entity(adr1);
482 if (get_entity_address_taken(ent1) == ir_address_not_taken) {
483 /* The address of the global variable was never taken, so
484 the pointer cannot match (R2). */
487 } else if (is_Sel(adr1)) {
488 /* the first address is a Sel */
489 ir_node *base1 = find_base_adr(adr1, &ent1);
491 if (base1 == get_irg_frame(irg)) {
492 /* first is a local variable ent1 */
494 /* the second address is a Sel */
495 ir_node *base2 = find_base_adr(adr2, &ent2);
497 if (base1 == base2) {
498 /* identical bases: check for different offsets */
499 return different_sel_offsets(adr1, adr2);
500 } else if (base2 == get_irg_frame(irg)) {
501 /* both addresses are local variables and we know
502 they are different (R1 a) */
505 } else if (base2 == get_irg_tls(irg)) {
506 /* the second one is a TLS variable so they are always
509 } else if (is_arg_Proj(base2)) {
510 /* the second one is an offset from a parameter so they are
511 always different (R1 e) */
514 } else if (is_arg_Proj(adr2)) {
515 /* a local variable and a parameter are always different (R1 e) */
518 } else if (base1 == get_irg_tls(irg)) {
519 /* the first is a TLS variable */
521 /* the second address is a Sel */
522 ir_node *base2 = find_base_adr(adr2, &ent2);
525 return different_sel_offsets(adr1, adr2);
526 else if (base2 == get_irg_frame(irg)) {
527 /* the second one is a local variable so they are always
530 } else if (base2 == get_irg_tls(irg)) {
531 /* both addresses are TLS variables and we know
532 they are different (R1 a) */
537 } else if (is_arg_Proj(base1)) {
538 /* the first one is an offset from a parameter */
540 /* the second address is a Sel */
541 ir_node *base2 = find_base_adr(adr2, &ent2);
543 if (base2 == get_irg_frame(irg)) {
544 /* the second one is a local variable so they are always
549 } else if (is_global_var(base1)) {
550 /* the first one is a global variable */
551 ent1 = get_SymConst_entity(base1);
553 /* the second address is a Sel */
554 ir_node *base2 = find_base_adr(adr2, &ent2);
557 return different_sel_offsets(adr1, adr2);
558 else if (base2 == get_irg_frame(irg)) {
559 /* the second one is a local variable so they are always
562 } else if (base2 == get_irg_tls(irg)) {
563 /* the second one is a TLS variable so they are always
566 } else if (is_arg_Proj(base2)) {
567 if (get_entity_address_taken(ent1) == ir_address_not_taken) {
568 /* The address of the global variable was never taken, so
569 the pointer cannot match (R2). */
572 } else if (is_global_var(base2)) {
573 ent2 = get_SymConst_entity(base2);
574 /* both addresses are global variables and we know
575 they are different (R1 a) */
582 /* some pointers, check if they have the same base buf constant offset */
583 ir_alias_relation rel = different_pointer(adr1, mode1, adr2, mode2);
584 if (rel != may_alias)
589 if (options & aa_opt_type_based) { /* Type based alias analysis */
590 ir_alias_relation rel;
592 if (options & aa_opt_byte_type_may_alias) {
593 if (get_mode_size_bits(mode1) == 8 || get_mode_size_bits(mode2) == 8) {
594 /* One of the modes address a byte. Assume a may_alias and leave
595 the type based check. */
596 goto leave_type_based_alias;
599 /* cheap check: If the mode sizes did not match, the types MUST be different */
600 if (get_mode_size_bits(mode1) != get_mode_size_bits(mode2))
604 rel = different_types(adr1, adr2);
605 if (rel != may_alias)
607 leave_type_based_alias:;
610 /* do we have a language specific memory disambiguator? */
611 if (language_disambuigator) {
612 ir_alias_relation rel = (*language_disambuigator)(irg, adr1, mode1, adr2, mode2);
613 if (rel != may_alias)
617 /* access points-to information here */
619 } /* _get_alias_relation */
622 * Determine the alias relation between two addresses.
624 ir_alias_relation get_alias_relation(
626 ir_node *adr1, ir_mode *mode1,
627 ir_node *adr2, ir_mode *mode2)
629 ir_alias_relation rel = _get_alias_relation(irg, adr1, mode1, adr2, mode2);
631 } /* get_alias_relation */
633 /* Set a source language specific memory disambiguator function. */
634 void set_language_memory_disambiguator(DISAMBIGUATOR_FUNC func) {
635 language_disambuigator = func;
636 } /* set_language_memory_disambiguator */
638 /** The result cache for the memory disambiguator. */
639 static set *result_cache = NULL;
641 /** An entry in the relation cache. */
642 typedef struct mem_disambig_entry {
643 ir_node *adr1; /**< The first address. */
644 ir_node *adr2; /**< The second address. */
645 ir_alias_relation result; /**< The alias relation result. */
646 } mem_disambig_entry;
648 #define HASH_ENTRY(adr1, adr2) (HASH_PTR(adr1) ^ HASH_PTR(adr2))
651 * Compare two relation cache entries.
653 static int cmp_mem_disambig_entry(const void *elt, const void *key, size_t size) {
654 const mem_disambig_entry *p1 = elt;
655 const mem_disambig_entry *p2 = key;
657 return p1->adr1 == p2->adr1 && p1->adr2 == p2->adr2;
658 } /* cmp_mem_disambig_entry */
661 * Initialize the relation cache.
663 void mem_disambig_init(void) {
664 result_cache = new_set(cmp_mem_disambig_entry, 8);
665 } /* mem_disambig_init */
668 * Determine the alias relation between two addresses.
670 ir_alias_relation get_alias_relation_ex(
672 ir_node *adr1, ir_mode *mode1,
673 ir_node *adr2, ir_mode *mode2)
675 mem_disambig_entry key, *entry;
677 if (! get_opt_alias_analysis())
680 if (get_irn_opcode(adr1) > get_irn_opcode(adr2)) {
688 entry = set_find(result_cache, &key, sizeof(key), HASH_ENTRY(adr1, adr2));
690 return entry->result;
692 key.result = get_alias_relation(irg, adr1, mode1, adr2, mode2);
694 set_insert(result_cache, &key, sizeof(key), HASH_ENTRY(adr1, adr2));
696 } /* get_alias_relation_ex */
698 /* Free the relation cache. */
699 void mem_disambig_term(void) {
701 del_set(result_cache);
704 } /* mem_disambig_term */
707 * Check the mode of a Load/Store with the mode of the entity
709 * If the mode of the entity and the Load/Store mode do not match, we
710 * have the bad reinterpret case:
713 * char b = *(char *)&i;
715 * We do NOT count this as one value and return address_taken
717 * However, we support an often used case. If the mode is two-complement
718 * we allow casts between signed/unsigned.
720 * @param mode the mode of the Load/Store
721 * @param ent_mode the mode of the accessed entity
723 * @return non-zero if the Load/Store is a hidden cast, zero else
725 static int is_hidden_cast(ir_mode *mode, ir_mode *ent_mode) {
726 if (ent_mode != mode) {
727 if (ent_mode == NULL ||
728 get_mode_size_bits(ent_mode) != get_mode_size_bits(mode) ||
729 get_mode_sort(ent_mode) != get_mode_sort(mode) ||
730 get_mode_arithmetic(ent_mode) != irma_twos_complement ||
731 get_mode_arithmetic(mode) != irma_twos_complement)
735 } /* is_hidden_cast */
738 * Determine the address_taken state of a node (or it's successor Sels).
740 * @param irn the node
742 static ir_address_taken_state find_address_taken_state(ir_node *irn) {
744 ir_mode *emode, *mode;
748 for (i = get_irn_n_outs(irn) - 1; i >= 0; --i) {
749 ir_node *succ = get_irn_out(irn, i);
751 switch (get_irn_opcode(succ)) {
753 /* check if this load is not a hidden conversion */
754 mode = get_Load_mode(succ);
755 ent = is_SymConst(irn) ? get_SymConst_entity(irn) : get_Sel_entity(irn);
756 emode = get_type_mode(get_entity_type(ent));
757 if (is_hidden_cast(mode, emode))
758 return ir_address_taken;
762 /* check that the node is not the Store's value */
763 value = get_Store_value(succ);
765 return ir_address_taken;
766 /* check if this Store is not a hidden conversion */
767 mode = get_irn_mode(value);
768 ent = is_SymConst(irn) ? get_SymConst_entity(irn) : get_Sel_entity(irn);
769 emode = get_type_mode(get_entity_type(ent));
770 if (is_hidden_cast(mode, emode))
771 return ir_address_taken;
775 /* Check the successor of irn. */
776 ir_address_taken_state res = find_address_taken_state(succ);
777 if (res != ir_address_not_taken)
783 /* Only the call address is not an address taker but
784 this is an uninteresting case, so we ignore it here. */
785 return ir_address_taken;
788 /* another op, the address may be taken */
789 return ir_address_taken_unknown;
792 /* All successors finished, the address is not taken. */
793 return ir_address_not_taken;
794 } /* find_address_taken_state */
797 * Update the "address taken" flag of all frame entities.
799 static void analyse_irg_address_taken(ir_graph *irg) {
800 ir_type *ft = get_irg_frame_type(irg);
804 /* set initial state to not_taken, as this is the "smallest" state */
805 for (i = get_class_n_members(ft) - 1; i >= 0; --i) {
806 ir_entity *ent = get_class_member(ft, i);
808 set_entity_address_taken(ent, ir_address_not_taken);
811 assure_irg_outs(irg);
813 irg_frame = get_irg_frame(irg);
815 for (i = get_irn_n_outs(irg_frame) - 1; i >= 0; --i) {
816 ir_node *succ = get_irn_out(irg_frame, i);
817 ir_address_taken_state state;
820 ir_entity *ent = get_Sel_entity(succ);
822 if (get_entity_address_taken(ent) == ir_address_taken)
825 state = find_address_taken_state(succ);
826 if (state > get_entity_address_taken(ent))
827 set_entity_address_taken(ent, state);
831 irg->adr_taken_state = ir_address_taken_computed;
832 } /* analyse_address_taken */
834 /* Returns the current address taken state of the graph. */
835 ir_address_taken_computed_state get_irg_address_taken_state(const ir_graph *irg) {
836 return irg->adr_taken_state;
837 } /* get_irg_address_taken_state */
839 /* Sets the current address taken state of the graph. */
840 void set_irg_address_taken_state(ir_graph *irg, ir_address_taken_computed_state state) {
841 irg->adr_taken_state = state;
842 } /* set_irg_address_taken_state */
844 /* Assure that the address taken flag is computed for the given graph. */
845 void assure_irg_address_taken_computed(ir_graph *irg) {
846 if (irg->adr_taken_state == ir_address_taken_not_computed)
847 analyse_irg_address_taken(irg);
848 } /* assure_irg_address_taken_computed */
851 * Initialize the address_taken flag for a global type like type.
853 static void init_taken_flag(ir_type * tp) {
856 /* All external visible entities are at least
857 ir_address_taken_unknown. This is very conservative. */
858 for (i = get_compound_n_members(tp) - 1; i >= 0; --i) {
859 ir_entity *ent = get_compound_member(tp, i);
860 ir_address_taken_state state;
862 state = get_entity_visibility(ent) == visibility_external_visible ?
863 ir_address_taken_unknown : ir_address_not_taken ;
864 set_entity_address_taken(ent, state);
866 } /* init_taken_flag */
870 * Print the address taken state of all entities of a given type for debugging.
872 static void print_address_taken_state(ir_type *tp) {
874 for (i = get_compound_n_members(tp) - 1; i >= 0; --i) {
875 ir_entity *ent = get_compound_member(tp, i);
876 ir_address_taken_state state = get_entity_address_taken(ent);
878 if (state != ir_address_not_taken) {
879 assert(ir_address_not_taken <= state && state <= ir_address_taken);
880 ir_printf("%+F: %s\n", ent, get_address_taken_state_name(state));
883 } /* print_address_taken_state */
884 #endif /* DEBUG_libfirm */
887 * Post-walker: check for global entity address
889 static void check_global_address(ir_node *irn, void *env) {
892 ir_address_taken_state state;
894 if (is_SymConst(irn) && get_SymConst_kind(irn) == symconst_addr_ent) {
896 ent = get_SymConst_entity(irn);
897 } else if (is_Sel(irn) && get_Sel_ptr(irn) == tls) {
898 /* A TLS variable. */
899 ent = get_Sel_entity(irn);
903 if (get_entity_address_taken(ent) >= ir_address_taken) {
904 /* Already at the maximum. */
907 state = find_address_taken_state(irn);
908 if (state > get_entity_address_taken(ent))
909 set_entity_address_taken(ent, state);
910 } /* check_global_address */
913 * Update the "address taken" flag of all global entities.
915 static void analyse_irp_globals_address_taken(void) {
918 FIRM_DBG_REGISTER(dbg, "firm.ana.irmemory");
920 init_taken_flag(get_glob_type());
921 init_taken_flag(get_tls_type());
923 for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
924 ir_graph *irg = get_irp_irg(i);
926 assure_irg_outs(irg);
927 irg_walk_graph(irg, NULL, check_global_address, get_irg_tls(irg));
931 if (firm_dbg_get_mask(dbg) & LEVEL_1) {
932 print_address_taken_state(get_glob_type());
933 print_address_taken_state(get_tls_type());
935 #endif /* DEBUG_libfirm */
938 irp->globals_adr_taken_state = ir_address_taken_computed;
939 } /* analyse_irp_globals_address_taken */
941 /* Returns the current address taken state of the globals. */
942 ir_address_taken_computed_state get_irp_globals_address_taken_state(void) {
943 return irp->globals_adr_taken_state;
944 } /* get_irp_globals_address_taken_state */
946 /* Sets the current address taken state of the graph. */
947 void set_irp_globals_address_taken_state(ir_address_taken_computed_state state) {
948 irp->globals_adr_taken_state = state;
949 } /* set_irg_address_taken_state */
951 /* Assure that the address taken flag is computed for the globals. */
952 void assure_irp_globals_address_taken_computed(void) {
953 if (irp->globals_adr_taken_state == ir_address_taken_not_computed)
954 analyse_irp_globals_address_taken();
955 } /* assure_irp_globals_address_taken_computed */