2 * Copyright (C) 1995-2008 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"
46 /** The debug handle. */
47 DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)
49 /** The source language specific language disambiguator function. */
50 static DISAMBIGUATOR_FUNC language_disambuigator = NULL;
52 /** The global memory disambiguator options. */
53 static unsigned global_mem_disamgig_opt = aa_opt_no_opt;
55 /* Returns a human readable name for an alias relation. */
56 const char *get_ir_alias_relation_name(ir_alias_relation rel) {
57 #define X(a) case a: return #a
62 default: assert(0); return "UNKNOWN";
67 /* Get the memory disambiguator options for a graph. */
68 unsigned get_irg_memory_disambiguator_options(ir_graph *irg) {
69 unsigned opt = irg->mem_disambig_opt;
70 if (opt & aa_opt_inherited)
71 return global_mem_disamgig_opt;
73 } /* get_irg_memory_disambiguator_options */
75 /* Set the memory disambiguator options for a graph. */
76 void set_irg_memory_disambiguator_options(ir_graph *irg, unsigned options) {
77 irg->mem_disambig_opt = options & ~aa_opt_inherited;
78 } /* set_irg_memory_disambiguator_options */
80 /* Set the global disambiguator options for all graphs not having local options. */
81 void set_irp_memory_disambiguator_options(unsigned options) {
82 global_mem_disamgig_opt = options;
83 } /* set_irp_memory_disambiguator_options */
86 * Find the base address and entity of an Sel node.
89 * @param pEnt after return points to the base entity.
91 * @return the base address.
93 static ir_node *find_base_adr(ir_node *sel, ir_entity **pEnt) {
94 ir_node *ptr = get_Sel_ptr(sel);
98 ptr = get_Sel_ptr(sel);
100 *pEnt = get_Sel_entity(sel);
102 } /* find_base_adr */
105 * Check if a given Const node is greater or equal a given size.
107 * @return no_alias if the Const is greater, may_alias else
109 static ir_alias_relation check_const(ir_node *cns, int size) {
110 tarval *tv = get_Const_tarval(cns);
114 return tarval_is_null(tv) ? may_alias : no_alias;
115 tv_size = new_tarval_from_long(size, get_tarval_mode(tv));
116 return tarval_cmp(tv_size, tv) & (pn_Cmp_Eq|pn_Cmp_Lt) ? no_alias : may_alias;
120 * Treat idx1 and idx2 as integer indexes and check if they differ always more than size.
122 * @return sure_alias iff idx1 == idx2
123 * no_alias iff they ALWAYS differ more than size
126 static ir_alias_relation different_index(ir_node *idx1, ir_node *idx2, int size) {
129 if (is_Const(idx1) && is_Const(idx2)) {
130 /* both are const, we can compare them */
131 tarval *tv1 = get_Const_tarval(idx1);
132 tarval *tv2 = get_Const_tarval(idx2);
133 tarval *tv, *tv_size;
137 return tv1 == tv2 ? sure_alias : no_alias;
139 /* arg, modes may be different */
140 m1 = get_tarval_mode(tv1);
141 m2 = get_tarval_mode(tv2);
143 int size = get_mode_size_bits(m1) - get_mode_size_bits(m2);
146 /* m1 is a small mode, cast up */
147 m1 = mode_is_signed(m1) ? find_signed_mode(m2) : find_unsigned_mode(m2);
149 /* should NOT happen, but if it does we give up here */
152 tv1 = tarval_convert_to(tv1, m1);
153 } else if (size > 0) {
154 /* m2 is a small mode, cast up */
155 m2 = mode_is_signed(m2) ? find_signed_mode(m1) : find_unsigned_mode(m1);
157 /* should NOT happen, but if it does we give up here */
160 tv2 = tarval_convert_to(tv2, m2);
162 /* here the size should be identical, check for signed */
163 if (get_mode_sign(m1) != get_mode_sign(m2)) {
164 /* find the signed */
165 if (mode_is_signed(m2)) {
172 /* m1 is now the signed one */
173 if (tarval_cmp(tv1, get_tarval_null(m1)) & (pn_Cmp_Eq|pn_Cmp_Gt)) {
174 /* tv1 is signed, but >= 0, simply cast into unsigned */
175 tv1 = tarval_convert_to(tv1, m2);
177 tv_size = new_tarval_from_long(size, m2);
179 if (tarval_cmp(tv2, tv_size) & (pn_Cmp_Eq|pn_Cmp_Gt)) {
180 /* tv1 is negative and tv2 >= tv_size, so the difference is bigger than size */
183 /* tv_size > tv2, so we can subtract without overflow */
184 tv2 = tarval_sub(tv_size, tv2);
186 /* tv1 is < 0, so we can negate it */
187 tv1 = tarval_neg(tv1);
189 /* cast it into unsigned. for two-complement it does the right thing for MIN_INT */
190 tv1 = tarval_convert_to(tv1, m2);
192 /* now we can compare without overflow */
193 return tarval_cmp(tv1, tv2) & (pn_Cmp_Eq|pn_Cmp_Gt) ? no_alias : may_alias;
197 if (tarval_cmp(tv1, tv2) == pn_Cmp_Gt) {
202 /* tv1 is now the "smaller" one */
203 tv = tarval_sub(tv2, tv1);
204 tv_size = new_tarval_from_long(size, get_tarval_mode(tv));
205 return tarval_cmp(tv_size, tv) & (pn_Cmp_Eq|pn_Cmp_Lt) ? no_alias : may_alias;
208 /* Note: we rely here on the fact that normalization puts constants on the RIGHT side */
210 ir_node *l1 = get_Add_left(idx1);
211 ir_node *r1 = get_Add_right(idx1);
216 return check_const(r1, size);
219 /* both are Adds, check if they are of x + a == x + b kind */
220 ir_node *l2 = get_Add_left(idx2);
221 ir_node *r2 = get_Add_right(idx2);
224 return different_index(r1, r2, size);
226 return different_index(r1, l2, size);
228 return different_index(l1, l2, size);
230 return different_index(l1, r2, size);
234 ir_node *l2 = get_Add_left(idx2);
235 ir_node *r2 = get_Add_right(idx2);
240 return check_const(r2, size);
245 ir_node *l1 = get_Sub_left(idx1);
246 ir_node *r1 = get_Sub_right(idx1);
251 return check_const(r1, size);
255 /* both are Subs, check if they are of x - a == x - b kind */
256 ir_node *l2 = get_Sub_left(idx2);
259 ir_node *r2 = get_Sub_right(idx2);
260 return different_index(r1, r2, size);
265 ir_node *l2 = get_Sub_left(idx2);
266 ir_node *r2 = get_Sub_right(idx2);
271 return check_const(r2, size);
276 } /* different_index */
279 * Two Sel addresses have the same base address, check if there offsets are
282 * @param adr1 The first address.
283 * @param adr2 The second address.
285 static ir_alias_relation different_sel_offsets(ir_node *sel1, ir_node *sel2) {
286 /* seems to be broken */
290 ir_entity *ent1 = get_Sel_entity(sel1);
291 ir_entity *ent2 = get_Sel_entity(sel2);
292 int i, check_arr = 0;
297 ir_type *tp1 = get_entity_type(ent1);
298 ir_type *tp2 = get_entity_type(ent2);
302 else if (get_type_state(tp1) == layout_fixed && get_type_state(tp2) == layout_fixed &&
303 get_type_size_bits(tp1) == get_type_size_bits(tp2))
307 /* we select an entity of same size, check for indexes */
308 int n = get_Sel_n_indexs(sel1);
311 if (n > 0 && n == get_Sel_n_indexs(sel2)) {
312 /* same non-zero number of indexes, an array access, check */
313 for (i = 0; i < n; ++i) {
314 ir_node *idx1 = get_Sel_index(sel1, i);
315 ir_node *idx2 = get_Sel_index(sel2, i);
316 ir_alias_relation res = different_index(idx1, idx2, 0); /* we can safely IGNORE the size here if it's at least >0 */
318 if (res == may_alias)
320 else if (res == no_alias)
323 /* if we have at least one no_alias, there is no alias relation, else we have sure */
324 return have_no > 0 ? no_alias : sure_alias;
329 } /* different_sel_offsets */
332 * Determine the alias relation by checking if adr1 and adr2 are pointer
335 * @param adr1 The first address.
336 * @param adr2 The second address.
338 static ir_alias_relation different_types(ir_node *adr1, ir_node *adr2)
340 ir_entity *ent1 = NULL, *ent2 = NULL;
342 if (is_SymConst_addr_ent(adr1))
343 ent1 = get_SymConst_entity(adr1);
344 else if (is_Sel(adr1))
345 ent1 = get_Sel_entity(adr1);
347 if (is_SymConst_addr_ent(adr2))
348 ent2 = get_SymConst_entity(adr2);
349 else if (is_Sel(adr2))
350 ent2 = get_Sel_entity(adr2);
352 if (ent1 != NULL && ent2 != NULL) {
353 ir_type *tp1 = get_entity_type(ent1);
354 ir_type *tp2 = get_entity_type(ent2);
357 if (is_Pointer_type(tp1) && is_Pointer_type(tp2)) {
358 /* do deref until no pointer types are found */
360 tp1 = get_pointer_points_to_type(tp1);
361 tp2 = get_pointer_points_to_type(tp2);
362 } while (is_Pointer_type(tp1) && is_Pointer_type(tp2));
365 if (get_type_tpop(tp1) != get_type_tpop(tp2)) {
366 /* different type structure */
369 if (is_Class_type(tp1)) {
370 /* check class hierarchy */
371 if (! is_SubClass_of(tp1, tp2) &&
372 ! is_SubClass_of(tp2, tp1))
375 /* different types */
381 } /* different_types */
384 * Returns non-zero if a node is a routine parameter.
386 * @param node the Proj node to test
388 static int is_arg_Proj(ir_node *node) {
391 node = get_Proj_pred(node);
394 return pn_Start_T_args == get_Proj_proj(node) && is_Start(get_Proj_pred(node));
398 * Returns non-zero if a node is a result on a malloc-like routine.
400 * @param node the Proj node to test
402 static int is_malloc_Result(ir_node *node) {
403 node = get_Proj_pred(node);
406 node = get_Proj_pred(node);
409 node = get_Call_ptr(node);
410 if (is_SymConst_addr_ent(node)) {
411 ir_entity *ent = get_SymConst_entity(node);
413 if (get_entity_additional_properties(ent) & mtp_property_malloc)
418 } /* is_malloc_Result */
421 * Returns true if an address represents a global variable.
423 * @param irn the node representing the address
425 static INLINE int is_global_var(ir_node *irn) {
426 return is_SymConst_addr_ent(irn);
427 } /* is_global_var */
430 * classify storage locations.
431 * Except STORAGE_CLASS_POINTER they are all disjoint.
432 * STORAGE_CLASS_POINTER potentially aliases all classes which don't have a
436 STORAGE_CLASS_POINTER = 0x0000,
437 STORAGE_CLASS_GLOBALVAR = 0x0001,
438 STORAGE_CLASS_LOCALVAR = 0x0002,
439 STORAGE_CLASS_ARGUMENT = 0x0003,
440 STORAGE_CLASS_TLS = 0x0004,
441 STORAGE_CLASS_MALLOCED = 0x0005,
443 STORAGE_CLASS_MODIFIER_NOTTAKEN = 0x1000,
444 } storage_class_class_t;
447 * Classify a base pointer.
449 * @param irg the graph of the pointer
450 * @param irn the node representing the base address
451 * @param ent the base entity of the base address iff any
453 static storage_class_class_t classify_pointer(ir_graph *irg, ir_node *irn, ir_entity *ent)
455 storage_class_class_t res = STORAGE_CLASS_POINTER;
456 if (is_SymConst_addr_ent(irn)) {
457 ir_entity *entity = get_SymConst_entity(irn);
458 res = STORAGE_CLASS_GLOBALVAR;
459 if (get_entity_address_taken(entity) == ir_address_not_taken)
460 res |= STORAGE_CLASS_MODIFIER_NOTTAKEN;
461 } else if (irn == get_irg_frame(irg)) {
462 res = STORAGE_CLASS_LOCALVAR;
463 if (ent != NULL && get_entity_address_taken(ent) == ir_address_not_taken)
464 res |= STORAGE_CLASS_MODIFIER_NOTTAKEN;
465 } else if (is_arg_Proj(irn)) {
466 return STORAGE_CLASS_ARGUMENT;
467 } else if (irn == get_irg_tls(irg)) {
468 res = STORAGE_CLASS_TLS;
469 if (ent != NULL && get_entity_address_taken(ent) == ir_address_not_taken)
470 res |= STORAGE_CLASS_MODIFIER_NOTTAKEN;
471 } else if (is_Proj(irn) && is_malloc_Result(irn)) {
472 return STORAGE_CLASS_MALLOCED;
479 * Determine the alias relation between two addresses.
481 static ir_alias_relation _get_alias_relation(
483 ir_node *adr1, ir_mode *mode1,
484 ir_node *adr2, ir_mode *mode2)
486 ir_entity *ent1, *ent2;
492 ir_node *orig_adr1 = adr1;
493 ir_node *orig_adr2 = adr2;
495 storage_class_class_t class1, class2;
496 int have_const_offsets;
498 if (! get_opt_alias_analysis())
504 options = get_irg_memory_disambiguator_options(irg);
506 /* The Armageddon switch */
507 if (options & aa_opt_no_alias)
510 /* do the addresses have constants offsets?
511 * Note: nodes are normalized to have constants at right inputs,
512 * sub X, C is normalized to add X, -C
514 have_const_offsets = 1;
515 while (is_Add(adr1)) {
516 ir_node *add_right = get_Add_right(adr1);
517 if (is_Const(add_right)) {
518 tarval *tv = get_Const_tarval(add_right);
519 offset1 += get_tarval_long(tv);
520 adr1 = get_Add_left(adr1);
522 } else if (mode_is_reference(get_irn_mode(add_right))) {
524 have_const_offsets = 0;
526 adr1 = get_Add_left(adr1);
527 have_const_offsets = 0;
530 while (is_Add(adr2)) {
531 ir_node *add_right = get_Add_right(adr2);
532 if (is_Const(add_right)) {
533 tarval *tv = get_Const_tarval(add_right);
534 offset2 += get_tarval_long(tv);
535 adr2 = get_Add_left(adr2);
537 } else if (mode_is_reference(get_irn_mode(add_right))) {
539 have_const_offsets = 0;
541 adr2 = get_Add_left(adr2);
542 have_const_offsets = 0;
546 mode_size = get_mode_size_bytes(mode1);
547 if (get_mode_size_bytes(mode2) > mode_size) {
548 mode_size = get_mode_size_bytes(mode2);
551 /* same base address -> compare offsets if possible.
552 * FIXME: type long is not sufficient for this task ...
554 if (adr1 == adr2 && have_const_offsets) {
555 if ((unsigned long)labs(offset2 - offset1) >= mode_size)
567 base1 = find_base_adr(adr1, &ent1);
570 base2 = find_base_adr(adr2, &ent2);
573 /* same base address -> compare sel entities */
574 if (base1 == base2 && ent1 != NULL && ent2 != NULL) {
577 else if (have_const_offsets)
578 return different_sel_offsets(adr1, adr2);
581 class1 = classify_pointer(irg, base1, ent1);
582 class2 = classify_pointer(irg, base2, ent2);
584 if (class1 == STORAGE_CLASS_POINTER) {
585 if (class2 & STORAGE_CLASS_MODIFIER_NOTTAKEN) {
590 } else if (class2 == STORAGE_CLASS_POINTER) {
591 if (class1 & STORAGE_CLASS_MODIFIER_NOTTAKEN) {
598 if (class1 != class2) {
602 if (class1 == STORAGE_CLASS_GLOBALVAR) {
603 ir_entity *entity1 = get_SymConst_entity(base1);
604 ir_entity *entity2 = get_SymConst_entity(base2);
605 if (entity1 != entity2)
608 /* for some reason CSE didn't happen yet for the 2 SymConsts... */
612 /* Type based alias analysis */
613 if (options & aa_opt_type_based) {
614 ir_alias_relation rel;
616 if (options & aa_opt_byte_type_may_alias) {
617 if (get_mode_size_bits(mode1) == 8 || get_mode_size_bits(mode2) == 8) {
618 /* One of the modes address a byte. Assume a may_alias and leave
619 the type based check. */
620 goto leave_type_based_alias;
623 /* cheap check: If the mode sizes did not match, the types MUST be different */
624 if (get_mode_size_bits(mode1) != get_mode_size_bits(mode2))
627 /* cheap test: if only one is a reference mode, no alias */
628 if (mode_is_reference(mode1) != mode_is_reference(mode2))
632 rel = different_types(orig_adr1, orig_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, orig_adr1, mode1, orig_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);
658 DB((dbg, LEVEL_1, "alias(%+F, %+F) = %s\n", adr1, adr2, get_ir_alias_relation_name(rel)));
660 } /* get_alias_relation */
662 /* Set a source language specific memory disambiguator function. */
663 void set_language_memory_disambiguator(DISAMBIGUATOR_FUNC func) {
664 language_disambuigator = func;
665 } /* set_language_memory_disambiguator */
667 /** The result cache for the memory disambiguator. */
668 static set *result_cache = NULL;
670 /** An entry in the relation cache. */
671 typedef struct mem_disambig_entry {
672 ir_node *adr1; /**< The first address. */
673 ir_node *adr2; /**< The second address. */
674 ir_alias_relation result; /**< The alias relation result. */
675 } mem_disambig_entry;
677 #define HASH_ENTRY(adr1, adr2) (HASH_PTR(adr1) ^ HASH_PTR(adr2))
680 * Compare two relation cache entries.
682 static int cmp_mem_disambig_entry(const void *elt, const void *key, size_t size) {
683 const mem_disambig_entry *p1 = elt;
684 const mem_disambig_entry *p2 = key;
687 return p1->adr1 == p2->adr1 && p1->adr2 == p2->adr2;
688 } /* cmp_mem_disambig_entry */
691 * Initialize the relation cache.
693 void mem_disambig_init(void) {
694 result_cache = new_set(cmp_mem_disambig_entry, 8);
695 } /* mem_disambig_init */
698 * Determine the alias relation between two addresses.
700 ir_alias_relation get_alias_relation_ex(
702 ir_node *adr1, ir_mode *mode1,
703 ir_node *adr2, ir_mode *mode2)
705 mem_disambig_entry key, *entry;
707 ir_fprintf(stderr, "%+F <-> %+F\n", adr1, adr2);
709 if (! get_opt_alias_analysis())
712 if (get_irn_opcode(adr1) > get_irn_opcode(adr2)) {
720 entry = set_find(result_cache, &key, sizeof(key), HASH_ENTRY(adr1, adr2));
722 return entry->result;
724 key.result = get_alias_relation(irg, adr1, mode1, adr2, mode2);
726 set_insert(result_cache, &key, sizeof(key), HASH_ENTRY(adr1, adr2));
728 } /* get_alias_relation_ex */
730 /* Free the relation cache. */
731 void mem_disambig_term(void) {
733 del_set(result_cache);
736 } /* mem_disambig_term */
739 * Check the mode of a Load/Store with the mode of the entity
741 * If the mode of the entity and the Load/Store mode do not match, we
742 * have the bad reinterpret case:
745 * char b = *(char *)&i;
747 * We do NOT count this as one value and return address_taken
749 * However, we support an often used case. If the mode is two-complement
750 * we allow casts between signed/unsigned.
752 * @param mode the mode of the Load/Store
753 * @param ent_mode the mode of the accessed entity
755 * @return non-zero if the Load/Store is a hidden cast, zero else
757 static int is_hidden_cast(ir_mode *mode, ir_mode *ent_mode) {
758 if (ent_mode != mode) {
759 if (ent_mode == NULL ||
760 get_mode_size_bits(ent_mode) != get_mode_size_bits(mode) ||
761 get_mode_sort(ent_mode) != get_mode_sort(mode) ||
762 get_mode_arithmetic(ent_mode) != irma_twos_complement ||
763 get_mode_arithmetic(mode) != irma_twos_complement)
767 } /* is_hidden_cast */
770 * Determine the address_taken state of a node (or it's successor Sels).
772 * @param irn the node
774 static ir_address_taken_state find_address_taken_state(ir_node *irn) {
776 ir_mode *emode, *mode;
780 for (i = get_irn_n_outs(irn) - 1; i >= 0; --i) {
781 ir_node *succ = get_irn_out(irn, i);
783 switch (get_irn_opcode(succ)) {
785 /* check if this load is not a hidden conversion */
786 mode = get_Load_mode(succ);
787 ent = is_SymConst(irn) ? get_SymConst_entity(irn) : get_Sel_entity(irn);
788 emode = get_type_mode(get_entity_type(ent));
789 if (is_hidden_cast(mode, emode))
790 return ir_address_taken;
794 /* check that the node is not the Store's value */
795 value = get_Store_value(succ);
797 return ir_address_taken;
798 /* check if this Store is not a hidden conversion */
799 mode = get_irn_mode(value);
800 ent = is_SymConst(irn) ? get_SymConst_entity(irn) : get_Sel_entity(irn);
801 emode = get_type_mode(get_entity_type(ent));
802 if (is_hidden_cast(mode, emode))
803 return ir_address_taken;
807 /* Check the successor of irn. */
808 ir_address_taken_state res = find_address_taken_state(succ);
809 if (res != ir_address_not_taken)
815 /* Only the call address is not an address taker but
816 this is an uninteresting case, so we ignore it here. */
817 for (j = get_Call_n_params(succ) - 1; j >= 0; --j) {
818 ir_node *param = get_Call_param(succ, j);
820 return ir_address_taken;
825 /* another op, the address may be taken */
826 return ir_address_taken_unknown;
829 /* All successors finished, the address is not taken. */
830 return ir_address_not_taken;
831 } /* find_address_taken_state */
834 * Update the "address taken" flag of all frame entities.
836 static void analyse_irg_address_taken(ir_graph *irg) {
837 ir_type *ft = get_irg_frame_type(irg);
841 /* set initial state to not_taken, as this is the "smallest" state */
842 for (i = get_class_n_members(ft) - 1; i >= 0; --i) {
843 ir_entity *ent = get_class_member(ft, i);
845 set_entity_address_taken(ent, ir_address_not_taken);
848 assure_irg_outs(irg);
850 irg_frame = get_irg_frame(irg);
852 for (i = get_irn_n_outs(irg_frame) - 1; i >= 0; --i) {
853 ir_node *succ = get_irn_out(irg_frame, i);
854 ir_address_taken_state state;
857 ir_entity *ent = get_Sel_entity(succ);
859 if (get_entity_address_taken(ent) == ir_address_taken)
862 state = find_address_taken_state(succ);
863 if (state > get_entity_address_taken(ent))
864 set_entity_address_taken(ent, state);
868 irg->adr_taken_state = ir_address_taken_computed;
869 } /* analyse_address_taken */
871 /* Returns the current address taken state of the graph. */
872 ir_address_taken_computed_state get_irg_address_taken_state(const ir_graph *irg) {
873 return irg->adr_taken_state;
874 } /* get_irg_address_taken_state */
876 /* Sets the current address taken state of the graph. */
877 void set_irg_address_taken_state(ir_graph *irg, ir_address_taken_computed_state state) {
878 irg->adr_taken_state = state;
879 } /* set_irg_address_taken_state */
881 /* Assure that the address taken flag is computed for the given graph. */
882 void assure_irg_address_taken_computed(ir_graph *irg) {
883 if (irg->adr_taken_state == ir_address_taken_not_computed)
884 analyse_irg_address_taken(irg);
885 } /* assure_irg_address_taken_computed */
889 * Initialize the address_taken flag for a global type like type.
891 static void init_taken_flag(ir_type * tp) {
894 /* All external visible entities are at least
895 ir_address_taken_unknown. This is very conservative. */
896 for (i = get_compound_n_members(tp) - 1; i >= 0; --i) {
897 ir_entity *ent = get_compound_member(tp, i);
898 ir_address_taken_state state;
900 state = get_entity_visibility(ent) == visibility_external_visible ?
901 ir_address_taken_unknown : ir_address_not_taken ;
902 set_entity_address_taken(ent, state);
904 } /* init_taken_flag */
906 static void check_initializer_nodes(ir_initializer_t *initializer)
908 switch(initializer->kind) {
909 case IR_INITIALIZER_CONST: {
910 ir_node *n = initializer->consti.value;
912 /* let's check if it's an address */
913 if (is_SymConst_addr_ent(n)) {
914 ir_entity *ent = get_SymConst_entity(n);
915 set_entity_address_taken(ent, ir_address_taken);
919 case IR_INITIALIZER_TARVAL:
920 case IR_INITIALIZER_NULL:
922 case IR_INITIALIZER_COMPOUND: {
925 for(i = 0; i < initializer->compound.n_initializers; ++i) {
926 ir_initializer_t *sub_initializer
927 = initializer->compound.initializers[i];
928 check_initializer_nodes(sub_initializer);
933 panic("invalid initialzier found");
937 * Mark all entities used in the initializer for the given entity as address taken
939 static void check_initializer(ir_entity *ent) {
943 /* do not check uninitialized values */
944 if (get_entity_variability(ent) == variability_uninitialized)
947 /* Beware: Methods initialized with "themself". This does not count as a taken
949 if (is_Method_type(get_entity_type(ent)))
952 if (ent->has_initializer) {
953 check_initializer_nodes(ent->attr.initializer);
954 } else if (is_atomic_entity(ent)) {
955 /* let's check if it's an address */
956 n = get_atomic_ent_value(ent);
957 if (is_SymConst_addr_ent(n)) {
958 ir_entity *ent = get_SymConst_entity(n);
959 set_entity_address_taken(ent, ir_address_taken);
962 for (i = get_compound_ent_n_values(ent) - 1; i >= 0; --i) {
963 n = get_compound_ent_value(ent, i);
965 /* let's check if it's an address */
966 if (is_SymConst_addr_ent(n)) {
967 ir_entity *ent = get_SymConst_entity(n);
968 set_entity_address_taken(ent, ir_address_taken);
972 } /* check_initializer */
976 * Mark all entities used in initializers as address taken
978 static void check_initializers(ir_type *tp) {
981 for (i = get_compound_n_members(tp) - 1; i >= 0; --i) {
982 ir_entity *ent = get_compound_member(tp, i);
984 check_initializer(ent);
986 } /* check_initializers */
990 * Print the address taken state of all entities of a given type for debugging.
992 static void print_address_taken_state(ir_type *tp) {
994 for (i = get_compound_n_members(tp) - 1; i >= 0; --i) {
995 ir_entity *ent = get_compound_member(tp, i);
996 ir_address_taken_state state = get_entity_address_taken(ent);
998 if (state != ir_address_not_taken) {
999 assert(ir_address_not_taken <= (int) state && state <= ir_address_taken);
1000 ir_printf("%+F: %s\n", ent, get_address_taken_state_name(state));
1003 } /* print_address_taken_state */
1004 #endif /* DEBUG_libfirm */
1007 * Post-walker: check for global entity address
1009 static void check_global_address(ir_node *irn, void *env) {
1012 ir_address_taken_state state;
1014 if (is_SymConst_addr_ent(irn)) {
1016 ent = get_SymConst_entity(irn);
1017 } else if (is_Sel(irn) && get_Sel_ptr(irn) == tls) {
1018 /* A TLS variable. */
1019 ent = get_Sel_entity(irn);
1023 if (get_entity_address_taken(ent) >= ir_address_taken) {
1024 /* Already at the maximum. */
1027 state = find_address_taken_state(irn);
1028 if (state > get_entity_address_taken(ent))
1029 set_entity_address_taken(ent, state);
1030 } /* check_global_address */
1033 * Update the "address taken" flag of all global entities.
1035 static void analyse_irp_globals_address_taken(void) {
1038 FIRM_DBG_REGISTER(dbg, "firm.ana.irmemory");
1040 init_taken_flag(get_glob_type());
1041 init_taken_flag(get_tls_type());
1043 check_initializers(get_glob_type());
1044 check_initializers(get_tls_type());
1046 for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
1047 ir_graph *irg = get_irp_irg(i);
1049 assure_irg_outs(irg);
1050 irg_walk_graph(irg, NULL, check_global_address, get_irg_tls(irg));
1053 #ifdef DEBUG_libfirm
1054 if (firm_dbg_get_mask(dbg) & LEVEL_1) {
1055 print_address_taken_state(get_glob_type());
1056 print_address_taken_state(get_tls_type());
1058 #endif /* DEBUG_libfirm */
1061 irp->globals_adr_taken_state = ir_address_taken_computed;
1062 } /* analyse_irp_globals_address_taken */
1064 /* Returns the current address taken state of the globals. */
1065 ir_address_taken_computed_state get_irp_globals_address_taken_state(void) {
1066 return irp->globals_adr_taken_state;
1067 } /* get_irp_globals_address_taken_state */
1069 /* Sets the current address taken state of the graph. */
1070 void set_irp_globals_address_taken_state(ir_address_taken_computed_state state) {
1071 irp->globals_adr_taken_state = state;
1072 } /* set_irg_address_taken_state */
1074 /* Assure that the address taken flag is computed for the globals. */
1075 void assure_irp_globals_address_taken_computed(void) {
1076 if (irp->globals_adr_taken_state == ir_address_taken_not_computed)
1077 analyse_irp_globals_address_taken();
1078 } /* assure_irp_globals_address_taken_computed */
1081 #include <adt/pmap.h>
1082 #include "typerep.h"
1084 DEBUG_ONLY(static firm_dbg_module_t *dbgcall = NULL;)
1086 /** Maps method types to cloned method types. */
1087 static pmap *mtp_map;
1090 * Clone a method type if not already cloned.
1092 static ir_type *clone_type_and_cache(ir_type *tp) {
1093 static ident *prefix = NULL;
1095 pmap_entry *e = pmap_find(mtp_map, tp);
1101 prefix = new_id_from_chars("C", 1);
1103 res = clone_type_method(tp, prefix);
1104 pmap_insert(mtp_map, tp, res);
1105 DB((dbgcall, LEVEL_2, "cloned type %+F into %+F\n", tp, res));
1108 } /* clone_type_and_cache */
1111 * Copy the calling conventions from the entities to the call type.
1113 static void update_calls_to_private(ir_node *call, void *env) {
1115 if (is_Call(call)) {
1116 ir_node *ptr = get_Call_ptr(call);
1118 if (is_SymConst(ptr)) {
1119 ir_entity *ent = get_SymConst_entity(ptr);
1120 ir_type *ctp = get_Call_type(call);
1122 if (get_entity_additional_properties(ent) & mtp_property_private) {
1123 if ((get_method_additional_properties(ctp) & mtp_property_private) == 0) {
1124 ctp = clone_type_and_cache(ctp);
1125 set_method_additional_property(ctp, mtp_property_private);
1126 set_Call_type(call, ctp);
1127 DB((dbgcall, LEVEL_1, "changed call to private method %+F\n", ent));
1132 } /* update_calls_to_private */
1134 /* Mark all private methods, i.e. those of which all call sites are known. */
1135 void mark_private_methods(void) {
1139 FIRM_DBG_REGISTER(dbgcall, "firm.opt.cc");
1141 assure_irp_globals_address_taken_computed();
1143 mtp_map = pmap_create();
1145 /* first step: change the calling conventions of the local non-escaped entities */
1146 for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
1147 ir_graph *irg = get_irp_irg(i);
1148 ir_entity *ent = get_irg_entity(irg);
1149 ir_address_taken_state state = get_entity_address_taken(ent);
1151 if (get_entity_visibility(ent) == visibility_local &&
1152 state == ir_address_not_taken) {
1153 ir_type *mtp = get_entity_type(ent);
1155 set_entity_additional_property(ent, mtp_property_private);
1156 DB((dbgcall, LEVEL_1, "found private method %+F\n", ent));
1157 if ((get_method_additional_properties(mtp) & mtp_property_private) == 0) {
1158 /* need a new type */
1159 mtp = clone_type_and_cache(mtp);
1160 set_entity_type(ent, mtp);
1161 set_method_additional_property(mtp, mtp_property_private);
1168 all_irg_walk(NULL, update_calls_to_private, NULL);
1170 pmap_destroy(mtp_map);
1171 } /* mark_private_methods */