X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fopt%2Fopt_polymorphy.c;h=cb0b9ee3a1f98b70ee1320f81f0b0b9b65a83d61;hb=9d3c8631459f431c313160dab5778e8a7b88dd92;hp=75edb3065cf8ceb0083016e3e1729e1151d29745;hpb=f21cd89a908d8203f21b59fc67b8bef02fff7b1a;p=libfirm diff --git a/ir/opt/opt_polymorphy.c b/ir/opt/opt_polymorphy.c index 75edb3065..cb0b9ee3a 100644 --- a/ir/opt/opt_polymorphy.c +++ b/ir/opt/opt_polymorphy.c @@ -1,14 +1,34 @@ /* - * Project: libFIRM - * File name: ir/opt/opt_polymorphy - * Purpose: Optimize polymorphic Sel nodes. - * Author: - * Created: - * CVS-ID: $Id$ - * Copyright: (c) 2005 Universität Karlsruhe - * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE. + * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved. + * + * This file is part of libFirm. + * + * This file may be distributed and/or modified under the terms of the + * GNU General Public License version 2 as published by the Free Software + * Foundation and appearing in the file LICENSE.GPL included in the + * packaging of this file. + * + * Licensees holding valid libFirm Professional Edition licenses may use + * this file in accordance with the libFirm Commercial License. + * Agreement provided with the Software. + * + * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE + * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE. + */ + +/** + * @file + * @brief Optimize polymorphic Sel and Load nodes. + * @author Goetz Lindenmaier, Michael Beck + * @version $Id$ + * @brief + * This file subsumes optimization code from cgana. */ +#include "config.h" +#include "opt_polymorphy.h" +#include "iroptimize.h" #include "irprog_t.h" #include "entity_t.h" #include "type_t.h" @@ -26,24 +46,24 @@ * * The default implementation hecks for Alloc nodes only. */ -ir_type *default_firm_get_Alloc(ir_node *n) { - n = skip_Proj(n); - if (get_irn_op(n) == op_Alloc) { - return get_Alloc_type(n); - } - return NULL; +static ir_type *default_firm_get_Alloc(ir_node *n) +{ + n = skip_Proj(n); + if (is_Alloc(n)) { + return get_Alloc_type(n); + } + return NULL; } -typedef ir_type *(*get_Alloc_func)(ir_node *n); - /** The get_Alloc function */ static get_Alloc_func firm_get_Alloc = default_firm_get_Alloc; /** Set a new get_Alloc_func and returns the old one. */ -get_Alloc_func firm_set_Alloc_func(get_Alloc_func newf) { - get_Alloc_func old = firm_get_Alloc; - firm_get_Alloc = newf; - return old; +get_Alloc_func firm_set_Alloc_func(get_Alloc_func newf) +{ + get_Alloc_func old = firm_get_Alloc; + firm_get_Alloc = newf; + return old; } /** Return dynamic type of ptr. @@ -55,27 +75,45 @@ get_Alloc_func firm_set_Alloc_func(get_Alloc_func newf) { * If we find a dynamic type this means that the pointer always points * to an object of this type during runtime. We resolved polymorphy. */ -static ir_type *get_dynamic_type(ir_node *ptr) { - ir_type *tp; - - /* skip Cast and Confirm nodes */ - for (;;) { - opcode code = get_irn_opcode(ptr); - - switch (code) { - case iro_Cast: - ptr = get_Cast_op(ptr); - continue; - case iro_Confirm: - ptr = get_Confirm_value(ptr); - continue; - default: - ; - } - break; - } - tp = (*firm_get_Alloc)(ptr); - return tp ? tp : firm_unknown_type; +static ir_type *get_dynamic_type(ir_node *ptr) +{ + ir_type *tp; + + /* skip Cast and Confirm nodes */ + for (;;) { + ir_opcode code = get_irn_opcode(ptr); + + switch (code) { + case iro_Cast: + ptr = get_Cast_op(ptr); + continue; + case iro_Confirm: + ptr = get_Confirm_value(ptr); + continue; + default: + ; + } + break; + } + tp = (*firm_get_Alloc)(ptr); + return tp ? tp : firm_unknown_type; +} + +/** + * Check, if an entity is final, i.e. is not anymore overridden. + */ +static int is_final_ent(ir_entity *ent) +{ + if (is_entity_final(ent)) { + /* not possible to override this entity. */ + return 1; + } + if (get_opt_closed_world() && get_entity_n_overwrittenby(ent) == 0) { + /* we have a closed world, so simply check how often it was + overridden. */ + return 1; + } + return 0; } /* @@ -83,60 +121,50 @@ static ir_type *get_dynamic_type(ir_node *ptr) { */ ir_node *transform_node_Sel(ir_node *node) { - ir_node *new_node, *ptr; - ir_type *dyn_tp; - entity *ent = get_Sel_entity(node); - - if (get_irp_phase_state() == phase_building) return node; - - if (!(get_opt_optimize() && get_opt_dyn_meth_dispatch())) - return node; - - if (!is_Method_type(get_entity_type(ent))) - return node; - - /* If the entity is a leave in the inheritance tree, - we can replace the Sel by a constant. */ - if (get_opt_closed_world() && get_entity_n_overwrittenby(ent) == 0) { - /* In dead code, we might call a leave entity that is a description. - Do not turn the Sel to a SymConst. */ - if (get_entity_peculiarity(ent) == peculiarity_description) { - /* We could remove the Call depending on this Sel. */ - new_node = node; - } else { - ir_node *rem_block = get_cur_block(); - set_cur_block(get_nodes_block(node)); - new_node = copy_const_value(get_irn_dbg_info(node), get_atomic_ent_value(ent)); - set_cur_block(rem_block); - DBG_OPT_POLY(node, new_node); - } - - return new_node; - } - - /* If we know the dynamic type, we can replace the Sel by a constant. */ - ptr = get_Sel_ptr(node); /* The address we select from. */ - dyn_tp = get_dynamic_type(ptr); /* The runtime type of ptr. */ - - if (dyn_tp != firm_unknown_type) { - entity *called_ent; - ir_node *rem_block; - - /* We know which method will be called, no dispatch necessary. */ - called_ent = resolve_ent_polymorphy(dyn_tp, ent); - /* called_ent may not be description: has no Address/Const to Call! */ - assert(get_entity_peculiarity(called_ent) != peculiarity_description); - - rem_block = get_cur_block(); - set_cur_block(get_nodes_block(node)); - new_node = copy_const_value(get_irn_dbg_info(node), get_atomic_ent_value(called_ent)); - set_cur_block(rem_block); - DBG_OPT_POLY(node, new_node); - - return new_node; - } - - return node; + ir_node *new_node, *ptr; + ir_type *dyn_tp; + ir_entity *ent = get_Sel_entity(node); + + if (get_irp_phase_state() == phase_building) return node; + + if (!get_opt_dyn_meth_dispatch()) + return node; + + if (!is_Method_type(get_entity_type(ent))) + return node; + + /* If the entity is a leave in the inheritance tree, + we can replace the Sel by a constant. */ + if (is_final_ent(ent)) { + /* In dead code, we might call a leave entity that is a description. + Do not turn the Sel to a SymConst. */ + if (get_entity_peculiarity(ent) == peculiarity_description) { + /* We could remove the Call depending on this Sel. */ + new_node = node; + } else { + new_node = copy_const_value(get_irn_dbg_info(node), get_atomic_ent_value(ent), get_nodes_block(node)); + DBG_OPT_POLY(node, new_node); + } + return new_node; + } + + /* If we know the dynamic type, we can replace the Sel by a constant. */ + ptr = get_Sel_ptr(node); /* The address we select from. */ + dyn_tp = get_dynamic_type(ptr); /* The runtime type of ptr. */ + + if (dyn_tp != firm_unknown_type) { + ir_entity *called_ent; + + /* We know which method will be called, no dispatch necessary. */ + called_ent = resolve_ent_polymorphy(dyn_tp, ent); + + new_node = copy_const_value(get_irn_dbg_info(node), get_atomic_ent_value(called_ent), get_nodes_block(node)); + DBG_OPT_POLY(node, new_node); + + return new_node; + } + + return node; } /* Transform Load(Sel(Alloc)[constant static entity]) @@ -147,50 +175,48 @@ ir_node *transform_node_Sel(ir_node *node) * a tuple, or replace the Projs of the load. * Therefore we call this optimization in ldstopt(). */ -ir_node *transform_node_Load(ir_node *n) +ir_node *transform_polymorph_Load(ir_node *load) { - ir_node *field_ptr, *new_node, *ptr; - entity *ent; - ir_type *dyn_tp; - - if (!(get_opt_optimize() && get_opt_dyn_meth_dispatch())) - return n; - - field_ptr = get_Load_ptr(n); - - if (! is_Sel(field_ptr)) return n; - - ent = get_Sel_entity(field_ptr); - if ((get_entity_allocation(ent) != allocation_static) || - (get_entity_variability(ent) != variability_constant) ) - return n; - - /* If the entity is a leave in the inheritance tree, - we can replace the Sel by a constant. */ - if ((get_irp_phase_state() != phase_building) && (get_entity_n_overwrittenby(ent) == 0)) { - new_node = copy_const_value(get_irn_dbg_info(n), get_atomic_ent_value(ent)); - DBG_OPT_POLY(field_ptr, new_node); - - return new_node; - } - - /* If we know the dynamic type, we can replace the Sel by a constant. */ - ptr = get_Sel_ptr(field_ptr); /* The address we select from. */ - dyn_tp = get_dynamic_type(ptr); /* The runtime type of ptr. */ - - if (dyn_tp != firm_unknown_type) { - entity *loaded_ent; - - /* We know which method will be called, no dispatch necessary. */ - loaded_ent = resolve_ent_polymorphy(dyn_tp, ent); - /* called_ent may not be description: has no Address/Const to Call! */ - assert(get_entity_peculiarity(loaded_ent) != peculiarity_description); - - new_node = copy_const_value(get_irn_dbg_info(n), get_atomic_ent_value(loaded_ent)); - DBG_OPT_POLY(field_ptr, new_node); - - return new_node; - } - - return n; + ir_node *new_node = NULL; + ir_node *field_ptr, *ptr; + ir_entity *ent; + ir_type *dyn_tp; + + if (!get_opt_dyn_meth_dispatch()) + return load; + + field_ptr = get_Load_ptr(load); + + if (! is_Sel(field_ptr)) return load; + + ent = get_Sel_entity(field_ptr); + if ( !(get_entity_linkage(ent) & IR_LINKAGE_CONSTANT) ) + return load; + + /* If the entity is a leave in the inheritance tree, + we can replace the Sel by a constant. */ + if ((get_irp_phase_state() != phase_building) && is_final_ent(ent)) { + new_node = get_atomic_ent_value(ent); + } else { + /* If we know the dynamic type, we can replace the Sel by a constant. */ + ptr = get_Sel_ptr(field_ptr); /* The address we select from. */ + dyn_tp = get_dynamic_type(ptr); /* The runtime type of ptr. */ + + if (dyn_tp != firm_unknown_type) { + ir_entity *loaded_ent; + + /* We know which method will be called, no dispatch necessary. */ + loaded_ent = resolve_ent_polymorphy(dyn_tp, ent); + new_node = get_atomic_ent_value(loaded_ent); + } + } + if (new_node != NULL) { + new_node = can_replace_load_by_const(load, new_node); + if (new_node != NULL) { + DBG_OPT_POLY(field_ptr, new_node); + + return new_node; + } + } + return load; }