* PURPOSE.
*/
-/*
- * Project: libFIRM
- * File name: ir/opt/opt_polymorphy
- * Purpose: Optimize polymorphic Sel nodes.
- * Author: Goetz Lindenmaier, Michael Beck
- * Created:
- * CVS-ID: $Id$
- * Copyright: (c) 2005 Universität Karlsruhe
+/**
+ * @file
+ * @brief Optimize polymorphic Sel and Load nodes.
+ * @author Goetz Lindenmaier, Michael Beck
+ * @version $Id$
+ * @summary
+ * This file subsumes optimization code from cgana.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
* 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;
+ n = skip_Proj(n);
+ if (get_irn_op(n) == op_Alloc) {
+ return get_Alloc_type(n);
+ }
+ return NULL;
}
typedef ir_type *(*get_Alloc_func)(ir_node *n);
/** 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 old = firm_get_Alloc;
+ firm_get_Alloc = newf;
+ return old;
}
/** Return dynamic type of ptr.
* 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 (;;) {
- 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;
+ 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;
+ 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;
}
/*
* Transform Sel[method] to SymC[method] if possible.
*/
-ir_node *transform_node_Sel(ir_node *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_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 (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 {
- 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) {
- ir_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 *transform_node_Sel(ir_node *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_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 (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 {
+ 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) {
+ ir_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;
}
/* Transform Load(Sel(Alloc)[constant static entity])
* 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 *field_ptr, *new_node, *ptr;
- ir_entity *ent;
- ir_type *dyn_tp;
+ir_node *transform_node_Load(ir_node *n) {
+ ir_node *field_ptr, *new_node, *ptr;
+ ir_entity *ent;
+ ir_type *dyn_tp;
- if (!(get_opt_optimize() && get_opt_dyn_meth_dispatch()))
- return n;
+ if (!(get_opt_optimize() && get_opt_dyn_meth_dispatch()))
+ return n;
- field_ptr = get_Load_ptr(n);
+ field_ptr = get_Load_ptr(n);
- if (! is_Sel(field_ptr)) return 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;
+ 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) && is_final_ent(ent)) {
- new_node = copy_const_value(get_irn_dbg_info(n), get_atomic_ent_value(ent));
- DBG_OPT_POLY(field_ptr, new_node);
+ /* 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 = copy_const_value(get_irn_dbg_info(n), get_atomic_ent_value(ent));
+ DBG_OPT_POLY(field_ptr, new_node);
- return 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 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;
+ 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);
- /* called_ent may not be description: has no Address/Const to Call! */
- assert(get_entity_peculiarity(loaded_ent) != peculiarity_description);
+ /* 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);
+ 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 new_node;
+ }
- return n;
+ return n;
}