X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fana%2Firmemory.c;h=bbf1a6f50d007434d7b46725eae6d004f5f429e2;hb=e3b765fcef0e337f4fe2e17d57d2fbaf1912ec79;hp=850326627a315c9a8c7f072ea5e1f69caee2bb70;hpb=a587dd2e23eafa549494155709fbd5f83afdf043;p=libfirm diff --git a/ir/ana/irmemory.c b/ir/ana/irmemory.c index 850326627..bbf1a6f50 100644 --- a/ir/ana/irmemory.c +++ b/ir/ana/irmemory.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved. + * Copyright (C) 1995-2011 University of Karlsruhe. All right reserved. * * This file is part of libFirm. * @@ -44,6 +44,7 @@ #include "debug.h" #include "error.h" #include "typerep.h" +#include "irpass.h" /** The debug handle. */ DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;) @@ -56,34 +57,45 @@ static DISAMBIGUATOR_FUNC language_disambuigator = NULL; static unsigned global_mem_disamgig_opt = aa_opt_no_opt; /* Returns a human readable name for an alias relation. */ -const char *get_ir_alias_relation_name(ir_alias_relation rel) { +const char *get_ir_alias_relation_name(ir_alias_relation rel) +{ #define X(a) case a: return #a switch (rel) { X(ir_no_alias); X(ir_may_alias); X(ir_sure_alias); - default: assert(0); return "UNKNOWN"; + default: + panic("UNKNOWN alias relation"); } #undef X } /* Get the memory disambiguator options for a graph. */ -unsigned get_irg_memory_disambiguator_options(ir_graph *irg) { +unsigned get_irg_memory_disambiguator_options(const ir_graph *irg) +{ unsigned opt = irg->mem_disambig_opt; if (opt & aa_opt_inherited) return global_mem_disamgig_opt; return opt; -} /* get_irg_memory_disambiguator_options */ +} /* Set the memory disambiguator options for a graph. */ -void set_irg_memory_disambiguator_options(ir_graph *irg, unsigned options) { +void set_irg_memory_disambiguator_options(ir_graph *irg, unsigned options) +{ irg->mem_disambig_opt = options & ~aa_opt_inherited; -} /* set_irg_memory_disambiguator_options */ +} /* Set the global disambiguator options for all graphs not having local options. */ -void set_irp_memory_disambiguator_options(unsigned options) { +void set_irp_memory_disambiguator_options(unsigned options) +{ global_mem_disamgig_opt = options; -} /* set_irp_memory_disambiguator_options */ +} + +/* Get the base storage class (ignore modifier) */ +ir_storage_class_class_t get_base_sc(ir_storage_class_class_t x) +{ + return x & ~ir_sc_modifiers; +} /** * Find the base address and entity of an Sel node. @@ -93,7 +105,8 @@ void set_irp_memory_disambiguator_options(unsigned options) { * * @return the base address. */ -static ir_node *find_base_adr(ir_node *sel, ir_entity **pEnt) { +static ir_node *find_base_adr(const ir_node *sel, ir_entity **pEnt) +{ ir_node *ptr = get_Sel_ptr(sel); while (is_Sel(ptr)) { @@ -102,7 +115,7 @@ static ir_node *find_base_adr(ir_node *sel, ir_entity **pEnt) { } *pEnt = get_Sel_entity(sel); return ptr; -} /* find_base_adr */ +} /** * Check if a given Const node is greater or equal a given size. @@ -112,15 +125,16 @@ static ir_node *find_base_adr(ir_node *sel, ir_entity **pEnt) { * * @return ir_no_alias if the Const is greater, ir_may_alias else */ -static ir_alias_relation check_const(ir_node *cns, int size) { - tarval *tv = get_Const_tarval(cns); - tarval *tv_size; +static ir_alias_relation check_const(const ir_node *cns, int size) +{ + ir_tarval *tv = get_Const_tarval(cns); + ir_tarval *tv_size; if (size == 0) return tarval_is_null(tv) ? ir_may_alias : ir_no_alias; tv_size = new_tarval_from_long(size, get_tarval_mode(tv)); - return tarval_cmp(tv_size, tv) & (pn_Cmp_Eq|pn_Cmp_Lt) ? ir_no_alias : ir_may_alias; -} /* check_const */ + return tarval_cmp(tv_size, tv) & (ir_relation_less_equal) ? ir_no_alias : ir_may_alias; +} /** * Treat idx1 and idx2 as integer indexes and check if they differ always more than size. @@ -133,14 +147,15 @@ static ir_alias_relation check_const(ir_node *cns, int size) { * ir_no_alias iff they ALWAYS differ more than size * ir_may_alias else */ -static ir_alias_relation different_index(ir_node *idx1, ir_node *idx2, int size) { +static ir_alias_relation different_index(const ir_node *idx1, const ir_node *idx2, int size) +{ if (idx1 == idx2) return ir_sure_alias; if (is_Const(idx1) && is_Const(idx2)) { /* both are const, we can compare them */ - tarval *tv1 = get_Const_tarval(idx1); - tarval *tv2 = get_Const_tarval(idx2); - tarval *tv, *tv_size; + ir_tarval *tv1 = get_Const_tarval(idx1); + ir_tarval *tv2 = get_Const_tarval(idx2); + ir_tarval *tv, *tv_size; ir_mode *m1, *m2; if (size == 0) @@ -173,20 +188,20 @@ static ir_alias_relation different_index(ir_node *idx1, ir_node *idx2, int size) if (get_mode_sign(m1) != get_mode_sign(m2)) { /* find the signed */ if (mode_is_signed(m2)) { - tarval *t = tv1; + ir_tarval *t = tv1; ir_mode *tm = m1; tv1 = tv2; m1 = m2; tv2 = t; m2 = tm; } /* m1 is now the signed one */ - if (tarval_cmp(tv1, get_tarval_null(m1)) & (pn_Cmp_Eq|pn_Cmp_Gt)) { + if (!tarval_is_negative(tv1)) { /* tv1 is signed, but >= 0, simply cast into unsigned */ tv1 = tarval_convert_to(tv1, m2); } else { tv_size = new_tarval_from_long(size, m2); - if (tarval_cmp(tv2, tv_size) & (pn_Cmp_Eq|pn_Cmp_Gt)) { + if (tarval_cmp(tv2, tv_size) & (ir_relation_greater_equal)) { /* tv1 is negative and tv2 >= tv_size, so the difference is bigger than size */ return ir_no_alias; } @@ -200,19 +215,19 @@ static ir_alias_relation different_index(ir_node *idx1, ir_node *idx2, int size) tv1 = tarval_convert_to(tv1, m2); /* now we can compare without overflow */ - return tarval_cmp(tv1, tv2) & (pn_Cmp_Eq|pn_Cmp_Gt) ? ir_no_alias : ir_may_alias; + return tarval_cmp(tv1, tv2) & (ir_relation_greater_equal) ? ir_no_alias : ir_may_alias; } } } - if (tarval_cmp(tv1, tv2) == pn_Cmp_Gt) { - tarval *t = tv1; + if (tarval_cmp(tv1, tv2) == ir_relation_greater) { + ir_tarval *t = tv1; tv1 = tv2; tv2 = t; } /* tv1 is now the "smaller" one */ tv = tarval_sub(tv2, tv1, NULL); tv_size = new_tarval_from_long(size, get_tarval_mode(tv)); - return tarval_cmp(tv_size, tv) & (pn_Cmp_Eq|pn_Cmp_Lt) ? ir_no_alias : ir_may_alias; + return tarval_cmp(tv_size, tv) & (ir_relation_less_equal) ? ir_no_alias : ir_may_alias; } /* Note: we rely here on the fact that normalization puts constants on the RIGHT side */ @@ -283,7 +298,7 @@ static ir_alias_relation different_index(ir_node *idx1, ir_node *idx2, int size) } return ir_may_alias; -} /* different_index */ +} /** * Two Sel addresses have the same base address, check if there offsets are @@ -292,7 +307,8 @@ static ir_alias_relation different_index(ir_node *idx1, ir_node *idx2, int size) * @param adr1 The first address. * @param adr2 The second address. */ -static ir_alias_relation different_sel_offsets(ir_node *sel1, ir_node *sel2) { +static ir_alias_relation different_sel_offsets(const ir_node *sel1, const ir_node *sel2) +{ /* seems to be broken */ (void) sel1; (void) sel2; @@ -334,9 +350,11 @@ static ir_alias_relation different_sel_offsets(ir_node *sel1, ir_node *sel2) { return have_no > 0 ? no_alias : sure_alias; } } +#else + (void) different_index; #endif return ir_may_alias; -} /* different_sel_offsets */ +} /** * Determine the alias relation by checking if adr1 and adr2 are pointer @@ -345,17 +363,17 @@ static ir_alias_relation different_sel_offsets(ir_node *sel1, ir_node *sel2) { * @param adr1 The first address. * @param adr2 The second address. */ -static ir_alias_relation different_types(ir_node *adr1, ir_node *adr2) +static ir_alias_relation different_types(const ir_node *adr1, const ir_node *adr2) { ir_entity *ent1 = NULL, *ent2 = NULL; - if (is_Global(adr1)) - ent1 = get_Global_entity(adr1); + if (is_SymConst_addr_ent(adr1)) + ent1 = get_SymConst_entity(adr1); else if (is_Sel(adr1)) ent1 = get_Sel_entity(adr1); - if (is_Global(adr2)) - ent2 = get_Global_entity(adr2); + if (is_SymConst_addr_ent(adr2)) + ent2 = get_SymConst_entity(adr2); else if (is_Sel(adr2)) ent2 = get_Sel_entity(adr2); @@ -386,14 +404,15 @@ static ir_alias_relation different_types(ir_node *adr1, ir_node *adr2) } } return ir_may_alias; -} /* different_types */ +} /** * Returns non-zero if a node is a result on a malloc-like routine. * * @param node the Proj node to test */ -static int is_malloc_Result(ir_node *node) { +static int is_malloc_Result(const ir_node *node) +{ node = get_Proj_pred(node); if (! is_Proj(node)) return 0; @@ -401,43 +420,37 @@ static int is_malloc_Result(ir_node *node) { if (! is_Call(node)) return 0; node = get_Call_ptr(node); - if (is_Global(node)) { - ir_entity *ent = get_Global_entity(node); + if (is_SymConst_addr_ent(node)) { + ir_entity *ent = get_SymConst_entity(node); if (get_entity_additional_properties(ent) & mtp_property_malloc) return 1; return 0; } return 0; -} /* is_malloc_Result */ +} -/** - * Classify a base pointer. - * - * @param irg the graph of the pointer - * @param irn the node representing the base address - * @param ent the base entity of the base address iff any - */ -ir_storage_class_class_t classify_pointer(ir_graph *irg, ir_node *irn, ir_entity *ent) +ir_storage_class_class_t classify_pointer(const ir_node *irn, + const ir_entity *ent) { + ir_graph *irg = get_irn_irg(irn); ir_storage_class_class_t res = ir_sc_pointer; - if (is_Global(irn)) { - ir_entity *entity = get_Global_entity(irn); - res = ir_sc_globalvar; + if (is_SymConst_addr_ent(irn)) { + ir_entity *entity = get_SymConst_entity(irn); + ir_type *owner = get_entity_owner(entity); + res = owner == get_tls_type() ? ir_sc_tls : ir_sc_globalvar; if (! (get_entity_usage(entity) & ir_usage_address_taken)) res |= ir_sc_modifier_nottaken; } else if (irn == get_irg_frame(irg)) { res = ir_sc_localvar; if (ent != NULL && !(get_entity_usage(ent) & ir_usage_address_taken)) res |= ir_sc_modifier_nottaken; - } else if (is_arg_Proj(irn)) { - return ir_sc_argument; - } else if (irn == get_irg_tls(irg)) { - res = ir_sc_tls; - if (ent != NULL && !(get_entity_usage(ent) & ir_usage_address_taken)) - res |= ir_sc_modifier_nottaken; } else if (is_Proj(irn) && is_malloc_Result(irn)) { return ir_sc_malloced; + } else if (is_Const(irn)) { + return ir_sc_globaladdr; + } else if (is_arg_Proj(irn)) { + res |= ir_sc_modifier_argument; } return res; @@ -446,7 +459,8 @@ ir_storage_class_class_t classify_pointer(ir_graph *irg, ir_node *irn, ir_entity /** * If adr represents a Bitfield Sel, skip it */ -static ir_node *skip_Bitfield_Sels(ir_node *adr) { +static const ir_node *skip_Bitfield_Sels(const ir_node *adr) +{ if (is_Sel(adr)) { ir_entity *ent = get_Sel_entity(adr); ir_type *bf_type = get_entity_type(ent); @@ -461,7 +475,6 @@ static ir_node *skip_Bitfield_Sels(ir_node *adr) { /** * Determine the alias relation between two addresses. * - * @param irg the graph of both memory operations * @param addr1 pointer address of the first memory operation * @param mode1 the mode of the accessed data through addr1 * @param addr2 pointer address of the second memory operation @@ -470,20 +483,20 @@ static ir_node *skip_Bitfield_Sels(ir_node *adr) { * @return found memory relation */ static ir_alias_relation _get_alias_relation( - ir_graph *irg, - ir_node *adr1, ir_mode *mode1, - ir_node *adr2, ir_mode *mode2) + const ir_node *adr1, const ir_mode *mode1, + const ir_node *adr2, const ir_mode *mode2) { ir_entity *ent1, *ent2; unsigned options; long offset1 = 0; long offset2 = 0; - ir_node *base1; - ir_node *base2; - ir_node *orig_adr1 = adr1; - ir_node *orig_adr2 = adr2; + const ir_node *base1; + const ir_node *base2; + const ir_node *orig_adr1 = adr1; + const ir_node *orig_adr2 = adr2; + ir_graph *irg; unsigned mode_size; - ir_storage_class_class_t class1, class2; + ir_storage_class_class_t class1, class2, mod1, mod2; int have_const_offsets; if (! get_opt_alias_analysis()) @@ -492,6 +505,7 @@ static ir_alias_relation _get_alias_relation( if (adr1 == adr2) return ir_sure_alias; + irg = get_irn_irg(adr1); options = get_irg_memory_disambiguator_options(irg); /* The Armageddon switch */ @@ -506,7 +520,7 @@ static ir_alias_relation _get_alias_relation( while (is_Add(adr1)) { ir_node *add_right = get_Add_right(adr1); if (is_Const(add_right) && !mode_is_reference(get_irn_mode(add_right))) { - tarval *tv = get_Const_tarval(add_right); + ir_tarval *tv = get_Const_tarval(add_right); offset1 += get_tarval_long(tv); adr1 = get_Add_left(adr1); } else if (mode_is_reference(get_irn_mode(add_right))) { @@ -520,7 +534,7 @@ static ir_alias_relation _get_alias_relation( while (is_Add(adr2)) { ir_node *add_right = get_Add_right(adr2); if (is_Const(add_right) && !mode_is_reference(get_irn_mode(add_right))) { - tarval *tv = get_Const_tarval(add_right); + ir_tarval *tv = get_Const_tarval(add_right); offset2 += get_tarval_long(tv); adr2 = get_Add_left(adr2); } else if (mode_is_reference(get_irn_mode(add_right))) { @@ -550,7 +564,7 @@ static ir_alias_relation _get_alias_relation( /* * Bitfields can be constructed as Sels from its base address. * As they have different entities, the disambiguator would find that they are - * alias free. While this is true for it's values, it is false for the addresses + * alias free. While this is true for its values, it is false for the addresses * (strictly speaking, the Sel's are NOT the addresses of the bitfields). * So, skip those bitfield selecting Sel's. */ @@ -577,19 +591,45 @@ static ir_alias_relation _get_alias_relation( return different_sel_offsets(adr1, adr2); } - class1 = classify_pointer(irg, base1, ent1); - class2 = classify_pointer(irg, base2, ent2); + mod1 = classify_pointer(base1, ent1); + mod2 = classify_pointer(base2, ent2); - if (class1 == ir_sc_pointer) { - if (class2 & ir_sc_modifier_nottaken) { - /* a pointer and an object whose objects was never taken */ - return ir_no_alias; + class1 = get_base_sc(mod1); + class2 = get_base_sc(mod2); + + /* struct-access cannot alias with variables */ + if (ent1 == NULL && ent2 != NULL && is_compound_type(get_entity_owner(ent2)) + && (class1 == ir_sc_globalvar || class1 == ir_sc_localvar || class1 == ir_sc_tls || class1 == ir_sc_globaladdr)) { + return ir_no_alias; + } + if (ent2 == NULL && ent1 != NULL && is_compound_type(get_entity_owner(ent1)) + && (class2 == ir_sc_globalvar || class2 == ir_sc_localvar || class2 == ir_sc_tls || class2 == ir_sc_globaladdr)) { + return ir_no_alias; + } + + if (class1 == ir_sc_pointer || class2 == ir_sc_pointer) { + /* swap pointer class to class1 */ + if (class2 == ir_sc_pointer) { + ir_storage_class_class_t temp = mod1; + mod1 = mod2; + mod2 = temp; + class1 = get_base_sc(mod1); + class2 = get_base_sc(mod2); } - } else if (class2 == ir_sc_pointer) { - if (class1 & ir_sc_modifier_nottaken) { - /* a pointer and an object whose objects was never taken */ + /* a pointer and an object whose address was never taken */ + if (mod2 & ir_sc_modifier_nottaken) { return ir_no_alias; } + if (mod1 & ir_sc_modifier_argument) { + if ( (options & aa_opt_no_alias_args) + && (mod2 & ir_sc_modifier_argument)) + return ir_no_alias; + if ( (options & aa_opt_no_alias_args_global) + && (class2 == ir_sc_globalvar + || class2 == ir_sc_tls + || class2 == ir_sc_globaladdr)) + return ir_no_alias; + } } else if (class1 != class2) { /* two objects from different memory spaces */ return ir_no_alias; @@ -603,6 +643,16 @@ static ir_alias_relation _get_alias_relation( /* for some reason CSE didn't happen yet for the 2 SymConsts... */ return ir_may_alias; + } else if (class1 == ir_sc_globaladdr) { + ir_tarval *tv = get_Const_tarval(base1); + offset1 += get_tarval_long(tv); + tv = get_Const_tarval(base2); + offset2 += get_tarval_long(tv); + + if ((unsigned long)labs(offset2 - offset1) >= mode_size) + return ir_no_alias; + else + return ir_sure_alias; } } @@ -637,71 +687,75 @@ leave_type_based_alias:; } /* do we have a language specific memory disambiguator? */ - if (language_disambuigator) { - ir_alias_relation rel = (*language_disambuigator)(irg, orig_adr1, mode1, orig_adr2, mode2); + if (language_disambuigator != NULL) { + ir_alias_relation rel = language_disambuigator(orig_adr1, mode1, orig_adr2, mode2); if (rel != ir_may_alias) return rel; } /* access points-to information here */ return ir_may_alias; -} /* _get_alias_relation */ +} /* * Determine the alias relation between two addresses. */ ir_alias_relation get_alias_relation( - ir_graph *irg, - ir_node *adr1, ir_mode *mode1, - ir_node *adr2, ir_mode *mode2) + const ir_node *adr1, const ir_mode *mode1, + const ir_node *adr2, const ir_mode *mode2) { - ir_alias_relation rel = _get_alias_relation(irg, adr1, mode1, adr2, mode2); + ir_alias_relation rel = _get_alias_relation(adr1, mode1, adr2, mode2); DB((dbg, LEVEL_1, "alias(%+F, %+F) = %s\n", adr1, adr2, get_ir_alias_relation_name(rel))); return rel; -} /* get_alias_relation */ +} /* Set a source language specific memory disambiguator function. */ -void set_language_memory_disambiguator(DISAMBIGUATOR_FUNC func) { +void set_language_memory_disambiguator(DISAMBIGUATOR_FUNC func) +{ language_disambuigator = func; -} /* set_language_memory_disambiguator */ +} /** The result cache for the memory disambiguator. */ static set *result_cache = NULL; /** An entry in the relation cache. */ typedef struct mem_disambig_entry { - ir_node *adr1; /**< The first address. */ - ir_node *adr2; /**< The second address. */ + const ir_node *adr1; /**< The first address. */ + const ir_mode *mode1; /**< The first address mode. */ + const ir_node *adr2; /**< The second address. */ + const ir_mode *mode2; /**< The second address mode. */ ir_alias_relation result; /**< The alias relation result. */ } mem_disambig_entry; -#define HASH_ENTRY(adr1, adr2) (HASH_PTR(adr1) ^ HASH_PTR(adr2)) +#define HASH_ENTRY(adr1, adr2) (HASH_PTR(adr1) ^ HASH_PTR(adr2)) /** * Compare two relation cache entries. */ -static int cmp_mem_disambig_entry(const void *elt, const void *key, size_t size) { - const mem_disambig_entry *p1 = elt; - const mem_disambig_entry *p2 = key; +static int cmp_mem_disambig_entry(const void *elt, const void *key, size_t size) +{ + const mem_disambig_entry *p1 = (const mem_disambig_entry*) elt; + const mem_disambig_entry *p2 = (const mem_disambig_entry*) key; (void) size; - return p1->adr1 == p2->adr1 && p1->adr2 == p2->adr2; -} /* cmp_mem_disambig_entry */ + return p1->adr1 == p2->adr1 && p1->adr2 == p2->adr2 && + p1->mode1 == p2->mode1 && p1->mode2 == p2->mode2; +} /** * Initialize the relation cache. */ -void mem_disambig_init(void) { +void mem_disambig_init(void) +{ result_cache = new_set(cmp_mem_disambig_entry, 8); -} /* mem_disambig_init */ +} /* * Determine the alias relation between two addresses. */ ir_alias_relation get_alias_relation_ex( - ir_graph *irg, - ir_node *adr1, ir_mode *mode1, - ir_node *adr2, ir_mode *mode2) + const ir_node *adr1, const ir_mode *mode1, + const ir_node *adr2, const ir_mode *mode2) { mem_disambig_entry key, *entry; @@ -711,30 +765,33 @@ ir_alias_relation get_alias_relation_ex( return ir_may_alias; if (get_irn_opcode(adr1) > get_irn_opcode(adr2)) { - ir_node *t = adr1; + const ir_node *t = adr1; adr1 = adr2; adr2 = t; } - key.adr1 = adr1; - key.adr2 = adr2; - entry = set_find(result_cache, &key, sizeof(key), HASH_ENTRY(adr1, adr2)); - if (entry) + key.adr1 = adr1; + key.adr2 = adr2; + key.mode1 = mode1; + key.mode2 = mode2; + entry = (mem_disambig_entry*) set_find(result_cache, &key, sizeof(key), HASH_ENTRY(adr1, adr2)); + if (entry != NULL) return entry->result; - key.result = get_alias_relation(irg, adr1, mode1, adr2, mode2); + key.result = get_alias_relation(adr1, mode1, adr2, mode2); set_insert(result_cache, &key, sizeof(key), HASH_ENTRY(adr1, adr2)); return key.result; -} /* get_alias_relation_ex */ +} /* Free the relation cache. */ -void mem_disambig_term(void) { - if (result_cache) { +void mem_disambig_term(void) +{ + if (result_cache != NULL) { del_set(result_cache); result_cache = NULL; } -} /* mem_disambig_term */ +} /** * Check the mode of a Load/Store with the mode of the entity @@ -755,32 +812,33 @@ void mem_disambig_term(void) { * * @return non-zero if the Load/Store is a hidden cast, zero else */ -static int is_hidden_cast(ir_mode *mode, ir_mode *ent_mode) { +static int is_hidden_cast(const ir_mode *mode, const ir_mode *ent_mode) +{ if (ent_mode == NULL) return false; if (ent_mode != mode) { if (ent_mode == NULL || get_mode_size_bits(ent_mode) != get_mode_size_bits(mode) || - get_mode_sort(ent_mode) != get_mode_sort(mode) || get_mode_arithmetic(ent_mode) != irma_twos_complement || get_mode_arithmetic(mode) != irma_twos_complement) return true; } return false; -} /* is_hidden_cast */ +} /** * Determine the usage state of a node (or its successor Sels). * * @param irn the node */ -static ir_entity_usage determine_entity_usage(const ir_node *irn, ir_entity *entity) { +static ir_entity_usage determine_entity_usage(const ir_node *irn, ir_entity *entity) +{ int i; ir_mode *emode, *mode; ir_node *value; ir_type *tp; - ir_entity_usage res = 0; + unsigned res = 0; for (i = get_irn_n_outs(irn) - 1; i >= 0; --i) { ir_node *succ = get_irn_out(irn, i); @@ -833,10 +891,19 @@ static ir_entity_usage determine_entity_usage(const ir_node *irn, ir_entity *ent case iro_Add: case iro_Sub: - case iro_Sel: { /* Check the successor of irn. */ res |= determine_entity_usage(succ, entity); break; + case iro_Sel: { + ir_entity *sel_entity = get_Sel_entity(succ); + /* this analysis can't handle unions correctly */ + if (is_Union_type(get_entity_owner(sel_entity))) { + res |= ir_usage_unknown; + break; + } + /* Check the successor of irn. */ + res |= determine_entity_usage(succ, sel_entity); + break; } case iro_Call: @@ -887,58 +954,98 @@ static ir_entity_usage determine_entity_usage(const ir_node *irn, ir_entity *ent } } - return res; + return (ir_entity_usage) res; } /** * Update the usage flags of all frame entities. */ -static void analyse_irg_entity_usage(ir_graph *irg) { +static void analyse_irg_entity_usage(ir_graph *irg) +{ ir_type *ft = get_irg_frame_type(irg); ir_node *irg_frame; - int i; + size_t i, n; + int j, k, static_link_arg; /* set initial state to not_taken, as this is the "smallest" state */ - for (i = get_class_n_members(ft) - 1; i >= 0; --i) { - ir_entity *ent = get_class_member(ft, i); - ir_entity_usage flags = - get_entity_stickyness(ent) == stickyness_sticky ? ir_usage_unknown : 0; - - set_entity_usage(ent, flags); + for (i = 0, n = get_class_n_members(ft); i < n; ++i) { + ir_entity *ent = get_class_member(ft, i); + + /* methods can only be analyzed globally */ + if (! is_method_entity(ent)) { + ir_entity_usage flags = ir_usage_none; + if (get_entity_linkage(ent) & IR_LINKAGE_HIDDEN_USER) + flags = ir_usage_unknown; + set_entity_usage(ent, flags); + } } assure_irg_outs(irg); irg_frame = get_irg_frame(irg); - for (i = get_irn_n_outs(irg_frame) - 1; i >= 0; --i) { - ir_node *succ = get_irn_out(irg_frame, i); + for (j = get_irn_n_outs(irg_frame) - 1; j >= 0; --j) { + ir_node *succ = get_irn_out(irg_frame, j); ir_entity *entity; - ir_entity_usage flags; + unsigned flags; - if (!is_Sel(succ)) + if (!is_Sel(succ)) continue; entity = get_Sel_entity(succ); flags = get_entity_usage(entity); flags |= determine_entity_usage(succ, entity); - set_entity_usage(entity, flags); + set_entity_usage(entity, (ir_entity_usage) flags); } - /* now computed */ - irg->entity_usage_state = ir_entity_usage_computed; -} + /* check inner functions accessing outer frame */ + static_link_arg = 0; + for (i = 0, n = get_class_n_members(ft); i < n; ++i) { + ir_entity *ent = get_class_member(ft, i); + ir_graph *inner_irg; + ir_node *args; -ir_entity_usage_computed_state get_irg_entity_usage_state(const ir_graph *irg) { - return irg->entity_usage_state; -} + if (! is_method_entity(ent)) + continue; + + inner_irg = get_entity_irg(ent); + if (inner_irg == NULL) + continue; + + assure_irg_outs(inner_irg); + args = get_irg_args(inner_irg); + for (j = get_irn_n_outs(args) - 1; j >= 0; --j) { + ir_node *arg = get_irn_out(args, j); + + if (get_Proj_proj(arg) == static_link_arg) { + for (k = get_irn_n_outs(arg) - 1; k >= 0; --k) { + ir_node *succ = get_irn_out(arg, k); + + if (is_Sel(succ)) { + ir_entity *entity = get_Sel_entity(succ); + + if (get_entity_owner(entity) == ft) { + /* found an access to the outer frame */ + unsigned flags; + + flags = get_entity_usage(entity); + flags |= determine_entity_usage(succ, entity); + set_entity_usage(entity, (ir_entity_usage) flags); + } + } + } + } + } + } -void set_irg_entity_usage_state(ir_graph *irg, ir_entity_usage_computed_state state) { - irg->entity_usage_state = state; + + /* now computed */ + set_irg_state(irg, IR_GRAPH_STATE_CONSISTENT_ENTITY_USAGE); } -void assure_irg_entity_usage_computed(ir_graph *irg) { - if (irg->entity_usage_state != ir_entity_usage_not_computed) +void assure_irg_entity_usage_computed(ir_graph *irg) +{ + if (is_irg_state(irg, IR_GRAPH_STATE_CONSISTENT_ENTITY_USAGE)) return; analyse_irg_entity_usage(irg); @@ -948,21 +1055,19 @@ void assure_irg_entity_usage_computed(ir_graph *irg) { /** * Initialize the entity_usage flag for a global type like type. */ -static void init_entity_usage(ir_type * tp) { - int i; +static void init_entity_usage(ir_type *tp) +{ + size_t i, n; /* We have to be conservative: All external visible entities are unknown */ - for (i = get_compound_n_members(tp) - 1; i >= 0; --i) { - ir_entity *ent = get_compound_member(tp, i); - ir_entity_usage flags = ir_usage_none; - ir_visibility vis = get_entity_visibility(ent); - - if (vis == visibility_external_visible || - vis == visibility_external_allocated || - get_entity_stickyness(ent) == stickyness_sticky) { + for (i = 0, n = get_compound_n_members(tp); i < n; ++i) { + ir_entity *ent = get_compound_member(tp, i); + unsigned flags = ir_usage_none; + + if (entity_is_externally_visible(ent)) { flags |= ir_usage_unknown; } - set_entity_usage(ent, flags); + set_entity_usage(ent, (ir_entity_usage) flags); } } @@ -973,15 +1078,15 @@ static void init_entity_usage(ir_type * tp) { */ static void check_initializer_nodes(ir_initializer_t *initializer) { - unsigned i; - ir_node *n; + size_t i; + ir_node *n; switch (initializer->kind) { case IR_INITIALIZER_CONST: /* let's check if it's an address */ n = initializer->consti.value; - if (is_Global(n)) { - ir_entity *ent = get_Global_entity(n); + if (is_SymConst_addr_ent(n)) { + ir_entity *ent = get_SymConst_entity(n); set_entity_usage(ent, ir_usage_unknown); } return; @@ -997,7 +1102,7 @@ static void check_initializer_nodes(ir_initializer_t *initializer) return; } panic("invalid initializer found"); -} /* check_initializer_nodes */ +} /** * Mark all entities used in the initializer for the given entity as unknown @@ -1005,40 +1110,31 @@ static void check_initializer_nodes(ir_initializer_t *initializer) * * @param ent the entity */ -static void check_initializer(ir_entity *ent) { - ir_node *n; - int i; - - /* do not check uninitialized values */ - if (get_entity_variability(ent) == variability_uninitialized) - return; - +static void check_initializer(ir_entity *ent) +{ /* Beware: Methods are always initialized with "themself". This does not - count as a taken address. */ + * count as a taken address. + * TODO: this initialisation with "themself" is wrong and should be removed + */ if (is_Method_type(get_entity_type(ent))) return; - if (ent->has_initializer) { - check_initializer_nodes(ent->attr.initializer); - } else if (is_atomic_entity(ent)) { - /* let's check if it's an address */ - n = get_atomic_ent_value(ent); - if (is_Global(n)) { - ir_entity *ent = get_Global_entity(n); - set_entity_usage(ent, ir_usage_unknown); - } - } else { - for (i = get_compound_ent_n_values(ent) - 1; i >= 0; --i) { - n = get_compound_ent_value(ent, i); + if (ent->initializer != NULL) { + check_initializer_nodes(ent->initializer); + } else if (entity_has_compound_ent_values(ent)) { + size_t i, n; + + for (i = 0, n = get_compound_ent_n_values(ent); i < n; ++i) { + ir_node *irn = get_compound_ent_value(ent, i); /* let's check if it's an address */ - if (is_Global(n)) { - ir_entity *ent = get_Global_entity(n); - set_entity_usage(ent, ir_usage_unknown); + if (is_SymConst_addr_ent(irn)) { + ir_entity *symconst_ent = get_SymConst_entity(irn); + set_entity_usage(symconst_ent, ir_usage_unknown); } } } -} /* check_initializer */ +} /** @@ -1046,15 +1142,16 @@ static void check_initializer(ir_entity *ent) { * * @param tp a compound type */ -static void check_initializers(ir_type *tp) { - int i; +static void check_initializers(ir_type *tp) +{ + size_t i, n; - for (i = get_compound_n_members(tp) - 1; i >= 0; --i) { + for (i = 0, n = get_compound_n_members(tp); i < n; ++i) { ir_entity *ent = get_compound_member(tp, i); check_initializer(ent); } -} /* check_initializers */ +} #ifdef DEBUG_libfirm /** @@ -1062,9 +1159,10 @@ static void check_initializers(ir_type *tp) { * * @param tp a compound type */ -static void print_entity_usage_flags(ir_type *tp) { - int i; - for (i = get_compound_n_members(tp) - 1; i >= 0; --i) { +static void print_entity_usage_flags(const ir_type *tp) +{ + size_t i, n; + for (i = 0, n = get_compound_n_members(tp); i < n; ++i) { ir_entity *ent = get_compound_member(tp, i); ir_entity_usage flags = get_entity_usage(ent); @@ -1087,53 +1185,51 @@ static void print_entity_usage_flags(ir_type *tp) { /** * Post-walker: check for global entity address */ -static void check_global_address(ir_node *irn, void *env) { - ir_node *tls = env; +static void check_global_address(ir_node *irn, void *data) +{ ir_entity *ent; - ir_entity_usage flags; + unsigned flags; + (void) data; - if (is_Global(irn)) { + if (is_SymConst_addr_ent(irn)) { /* A global. */ - ent = get_Global_entity(irn); - } else if (is_Sel(irn) && get_Sel_ptr(irn) == tls) { - /* A TLS variable. */ - ent = get_Sel_entity(irn); + ent = get_SymConst_entity(irn); } else return; flags = get_entity_usage(ent); flags |= determine_entity_usage(irn, ent); - set_entity_usage(ent, flags); -} /* check_global_address */ + set_entity_usage(ent, (ir_entity_usage) flags); +} /** * Update the entity usage flags of all global entities. */ -static void analyse_irp_globals_entity_usage(void) { - int i; +static void analyse_irp_globals_entity_usage(void) +{ + size_t i, n; ir_segment_t s; - for (s = IR_SEGMENT_FIRST; s < IR_SEGMENT_COUNT; ++s) { + for (s = IR_SEGMENT_FIRST; s <= IR_SEGMENT_LAST; ++s) { ir_type *type = get_segment_type(s); init_entity_usage(type); } - for (s = IR_SEGMENT_FIRST; s < IR_SEGMENT_COUNT; ++s) { + for (s = IR_SEGMENT_FIRST; s <= IR_SEGMENT_LAST; ++s) { ir_type *type = get_segment_type(s); check_initializers(type); } - for (i = get_irp_n_irgs() - 1; i >= 0; --i) { + for (i = 0, n = get_irp_n_irgs(); i < n; ++i) { ir_graph *irg = get_irp_irg(i); assure_irg_outs(irg); - irg_walk_graph(irg, NULL, check_global_address, get_irg_tls(irg)); + irg_walk_graph(irg, NULL, check_global_address, NULL); } #ifdef DEBUG_libfirm if (firm_dbg_get_mask(dbg) & LEVEL_1) { - ir_segment_t s; - for (s = IR_SEGMENT_FIRST; s < IR_SEGMENT_COUNT; ++s) { + for (s = IR_SEGMENT_FIRST; s <= IR_SEGMENT_LAST; ++s) { print_entity_usage_flags(get_segment_type(s)); } } @@ -1144,24 +1240,28 @@ static void analyse_irp_globals_entity_usage(void) { } /* Returns the current address taken state of the globals. */ -ir_entity_usage_computed_state get_irp_globals_entity_usage_state(void) { +ir_entity_usage_computed_state get_irp_globals_entity_usage_state(void) +{ return irp->globals_entity_usage_state; } /* Sets the current address taken state of the graph. */ -void set_irp_globals_entity_usage_state(ir_entity_usage_computed_state state) { +void set_irp_globals_entity_usage_state(ir_entity_usage_computed_state state) +{ irp->globals_entity_usage_state = state; } /* Assure that the address taken flag is computed for the globals. */ -void assure_irp_globals_entity_usage_computed(void) { +void assure_irp_globals_entity_usage_computed(void) +{ if (irp->globals_entity_usage_state != ir_entity_usage_not_computed) return; analyse_irp_globals_entity_usage(); } -void firm_init_memory_disambiguator(void) { +void firm_init_memory_disambiguator(void) +{ FIRM_DBG_REGISTER(dbg, "firm.ana.irmemory"); FIRM_DBG_REGISTER(dbgcall, "firm.opt.cc"); } @@ -1175,29 +1275,26 @@ static pmap *mtp_map; * * @param tp the type to clone */ -static ir_type *clone_type_and_cache(ir_type *tp) { - static ident *prefix = NULL; +static ir_type *clone_type_and_cache(ir_type *tp) +{ ir_type *res; pmap_entry *e = pmap_find(mtp_map, tp); - if (e) - return e->value; + if (e != NULL) + return (ir_type*) e->value; - if (prefix == NULL) - prefix = new_id_from_chars("C", 1); - - res = clone_type_method(tp, prefix); + res = clone_type_method(tp); pmap_insert(mtp_map, tp, res); - DB((dbgcall, LEVEL_2, "cloned type %+F into %+F\n", tp, res)); return res; -} /* clone_type_and_cache */ +} /** * Walker: clone all call types of Calls to methods having the * mtp_property_private property set. */ -static void update_calls_to_private(ir_node *call, void *env) { +static void update_calls_to_private(ir_node *call, void *env) +{ (void) env; if (is_Call(call)) { ir_node *ptr = get_Call_ptr(call); @@ -1209,18 +1306,19 @@ static void update_calls_to_private(ir_node *call, void *env) { if (get_entity_additional_properties(ent) & mtp_property_private) { if ((get_method_additional_properties(ctp) & mtp_property_private) == 0) { ctp = clone_type_and_cache(ctp); - set_method_additional_property(ctp, mtp_property_private); + add_method_additional_properties(ctp, mtp_property_private); set_Call_type(call, ctp); - DB((dbgcall, LEVEL_1, "changed call to private method %+F\n", ent)); + DB((dbgcall, LEVEL_1, "changed call to private method %+F using cloned type %+F\n", ent, ctp)); } } } } -} /* update_calls_to_private */ +} /* Mark all private methods, i.e. those of which all call sites are known. */ -void mark_private_methods(void) { - int i; +void mark_private_methods(void) +{ + size_t i, n; int changed = 0; assure_irp_globals_entity_usage_computed(); @@ -1228,25 +1326,22 @@ void mark_private_methods(void) { mtp_map = pmap_create(); /* first step: change the calling conventions of the local non-escaped entities */ - for (i = get_irp_n_irgs() - 1; i >= 0; --i) { + for (i = 0, n = get_irp_n_irgs(); i < n; ++i) { ir_graph *irg = get_irp_irg(i); ir_entity *ent = get_irg_entity(irg); ir_entity_usage flags = get_entity_usage(ent); - /* If an entity is sticky, it might be called from external - places (like inline assembler), so do NOT mark it as private. */ - if (get_entity_visibility(ent) == visibility_local && - !(flags & ir_usage_address_taken) && - get_entity_stickyness(ent) != stickyness_sticky) { + if (!(flags & ir_usage_address_taken) && !entity_is_externally_visible(ent)) { ir_type *mtp = get_entity_type(ent); - set_entity_additional_property(ent, mtp_property_private); + add_entity_additional_properties(ent, mtp_property_private); DB((dbgcall, LEVEL_1, "found private method %+F\n", ent)); if ((get_method_additional_properties(mtp) & mtp_property_private) == 0) { /* need a new type */ mtp = clone_type_and_cache(mtp); + add_method_additional_properties(mtp, mtp_property_private); set_entity_type(ent, mtp); - set_method_additional_property(mtp, mtp_property_private); + DB((dbgcall, LEVEL_2, "changed entity type of %+F to %+F\n", ent, mtp)); changed = 1; } } @@ -1256,4 +1351,10 @@ void mark_private_methods(void) { all_irg_walk(NULL, update_calls_to_private, NULL); pmap_destroy(mtp_map); -} /* mark_private_methods */ +} + +/* create a pass for mark_private_methods() */ +ir_prog_pass_t *mark_private_methods_pass(const char *name) +{ + return def_prog_pass(name ? name : "mark_private_methods", mark_private_methods); +}