/*
- * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
+ * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
*
* This file is part of libFirm.
*
* @brief Optimize polymorphic Sel and Load nodes.
* @author Goetz Lindenmaier, Michael Beck
* @version $Id$
- * @summary
+ * @brief
* This file subsumes optimization code from cgana.
*/
-#ifdef HAVE_CONFIG_H
#include "config.h"
-#endif
+#include "opt_polymorphy.h"
#include "iroptimize.h"
#include "irprog_t.h"
#include "entity_t.h"
*
* The default implementation hecks for Alloc nodes only.
*/
-ir_type *default_firm_get_Alloc(ir_node *n) {
+static ir_type *default_firm_get_Alloc(ir_node *n)
+{
n = skip_Proj(n);
- if (get_irn_op(n) == op_Alloc) {
+ 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 firm_set_Alloc_func(get_Alloc_func newf)
+{
get_Alloc_func old = firm_get_Alloc;
firm_get_Alloc = newf;
return old;
* 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) {
+static ir_type *get_dynamic_type(ir_node *ptr)
+{
ir_type *tp;
/* skip Cast and Confirm nodes */
/**
* Check, if an entity is final, i.e. is not anymore overridden.
*/
-static int is_final_ent(ir_entity *ent) {
+static int is_final_ent(ir_entity *ent)
+{
if (is_entity_final(ent)) {
/* not possible to override this entity. */
return 1;
/*
* Transform Sel[method] to SymC[method] if possible.
*/
-ir_node *transform_node_Sel(ir_node *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);
/* 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));
* 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_node *transform_polymorph_Load(ir_node *load)
+{
+ ir_node *new_node = NULL;
+ ir_node *field_ptr, *ptr;
ir_entity *ent;
ir_type *dyn_tp;
if (!(get_opt_optimize() && get_opt_dyn_meth_dispatch()))
- return n;
+ return load;
- field_ptr = get_Load_ptr(n);
+ field_ptr = get_Load_ptr(load);
- if (! is_Sel(field_ptr)) return n;
+ if (! is_Sel(field_ptr)) return load;
ent = get_Sel_entity(field_ptr);
- if ((get_entity_allocation(ent) != allocation_static) ||
- (get_entity_variability(ent) != variability_constant) )
- return n;
+ 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 = copy_const_value(get_irn_dbg_info(n), get_atomic_ent_value(ent));
- DBG_OPT_POLY(field_ptr, new_node);
-
- return new_node;
+ 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);
- /* 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);
- /* 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 new_node;
+ }
}
-
- return n;
+ return load;
}
projects / libfirm / blobdiff