/*
- * Project: libFIRM
- * File name: ir/ana/cgana.c
- * Purpose: Intraprozedural analyses to estimate the call graph.
- * Author: Hubert Schmid
- * Modified by:
- * Created: 09.06.2002
- * CVS-ID: $Id$
- * Copyright: (c) 1999-2003 Universität Karlsruhe
- * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
+ * Copyrigth (C) 1995-2007 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.
*/
/**
- * Intraprozedurale Analyse zur Abschätzung der Aufrufrelation. Es
- * wird eine Menge von freien Methoden und anschließend die an den
- * Call-Operationen aufrufbaren Methoden bestimmt.
+ * @file
+ * @brief Intraprozedural analyses to estimate the call graph.
+ * @author Hubert Schmid
+ * @date 09.06.2002
+ * @version $Id$
+ * @summary
+ * Interprocedural analysis to estimate the calling relation.
*
+ * This analysis computes all entities representing methods that
+ * can be called at a Call node. Further it computes a set of
+ * methods that are 'free', i.e., their adress is handled by
+ * the program directly, or they are visible external.
*/
#ifdef HAVE_CONFIG_H
-# include <config.h>
+# include "config.h"
+#endif
+
+#ifdef HAVE_STRING_H
+# include <string.h>
#endif
-#include <stdlib.h>
#include "cgana.h"
#include "rta.h"
-
-#include "eset.h"
-#include "pmap.h"
-#include "array.h"
-#include "irprog.h"
+#include "xmalloc.h"
+#include "irnode_t.h"
+#include "irmode_t.h"
+#include "irprog_t.h"
#include "irgwalk.h"
#include "ircons.h"
#include "irgmod.h"
-#include "irnode_t.h"
-#include "irflag_t.h"
+#include "iropt.h"
+#include "irflag_t.h"
#include "dbginfo_t.h"
+#include "iropt_dbg.h"
-/* Eindeutige Adresse zur Markierung von besuchten Knoten und zur
- * Darstellung der unbekannten Methode. */
-static void * MARK = &MARK;
+#include "eset.h"
+#include "pmap.h"
+#include "array.h"
+#include "irdump.h"
+#include "irhooks.h"
-/* --- sel methods ---------------------------------------------------------- */
-static eset * entities = NULL;
+/* unambiguous address used as a mark. */
+static void *MARK = &MARK;
+static eset *entities = NULL;
-/* Bestimmt die eindeutige Methode, die die Methode für den
- * übergebenene (dynamischen) Typ überschreibt. */
-entity * get_implementation(type * class, entity * method) {
- int i;
- if (get_entity_peculiarity(method) != peculiarity_description &&
- get_entity_owner(method) == class) {
- return method;
- }
- for (i = get_entity_n_overwrittenby(method) - 1; i >= 0; --i) {
- entity * e = get_entity_overwrittenby(method, i);
- if (get_entity_peculiarity(e) != peculiarity_description && get_entity_owner(e) == class) {
- return e;
- }
- }
- for (i = get_class_n_supertypes(class) - 1; i >= 0; --i) {
- entity * e = get_implementation(get_class_supertype(class, i), method);
- if (e) {
- return e;
- }
- }
- assert(0 && "implementation not found");
- return NULL;
-}
+/*--------------------------------------------------------------------------*/
+/* The analysis */
+/*--------------------------------------------------------------------------*/
-/* Returns the entity that contains the implementation of the inherited
- entity if available, else returns the entity passed. */
-entity *get_inherited_methods_implementation(entity *inh_meth) {
- entity *impl_meth = NULL;
- ir_node *addr = get_atomic_ent_value(inh_meth);
- assert(addr && "constant entity without value");
- if (intern_get_irn_op(addr) == op_Const) {
- impl_meth = tarval_to_entity(get_Const_tarval(addr));
- } else {
- assert(0 && "Complex constant values not supported -- address of method should be straight constant!");
- }
- if (impl_meth && (get_entity_peculiarity(impl_meth) != peculiarity_existent)) {
- printf("this_meth: "); DDMEO(inh_meth);
- printf("impl meth: "); DDMEO(impl_meth);
- assert(!impl_meth || get_entity_peculiarity(impl_meth) == peculiarity_existent);
- }
- return impl_meth? impl_meth : inh_meth;
-}
+/*--------------------------------------------------------------------------*/
+/* Initialize datastructures, remove unwanted constructs, optimize */
+/* call target computations. */
+/*--------------------------------------------------------------------------*/
+/** Returns the entity that contains the implementation of the inherited
+ * entity if available, else returns the entity passed. */
+static ir_entity *get_inherited_methods_implementation(ir_entity *inh_meth) {
+ assert(get_atomic_ent_value(inh_meth) && "constant entity without value");
+ assert((get_irn_op(get_atomic_ent_value(inh_meth)) == op_SymConst) &&
+ (get_SymConst_kind(get_atomic_ent_value(inh_meth)) == symconst_addr_ent) &&
+ "Complex constant values not supported -- address of method should be straight constant!");
-/* Collect the entity representing the implementation of this
- entity (not the same if inherited) and all entities for overwriting
- implementations in "set".
- If the implementation of the method is not included in the
- compilation unit "open" is set to true.
- A recursive descend in the overwritten relation.
- Cycle-free, therefore must terminate. */
-void collect_impls(entity *method, eset *set, int *size, bool *open) {
+ return get_SymConst_entity(get_atomic_ent_value(inh_meth));
+}
+
+/** Collect the entity representing the implementation of this
+ * method (not the same if inherited) and all entities for overwriting
+ * implementations in "set".
+ * If the implementation of the method is not included in the
+ * compilation unit "open" is set to true.
+ * A recursive descend in the overwritten relation.
+ * Cycle-free, therefore must terminate.
+ *
+ * @param method
+ * @param set A set of entities.
+ * @param size Number of entities in set.
+ * @param open
+ */
+static void collect_impls(ir_entity *method, eset *set, int *size, int *open) {
int i;
- if (get_entity_peculiarity(method) == peculiarity_existent) {
- if (get_entity_visibility(method) == visibility_external_allocated) {
- assert(get_entity_irg(method) == NULL);
- *open = true;
- } else {
- assert(get_entity_irg(method) != NULL);
- if (!eset_contains(set, method)) {
- eset_insert(set, method);
- ++(*size);
- }
- }
- }
- if (get_entity_peculiarity(method) == peculiarity_inherited) {
- entity *impl_ent = get_inherited_methods_implementation(method);
- assert(impl_ent && "no implementation for inherited entity");
- if (get_entity_visibility(impl_ent) == visibility_external_allocated) {
- assert(get_entity_irg(impl_ent) == NULL);
- *open = true;
- } else {
- assert(get_entity_irg(impl_ent) != NULL);
- if (!eset_contains(set, impl_ent)) {
- eset_insert(set, impl_ent);
+ ir_entity *impl;
+
+ /* Add the implementation to the set if it contains an irg, else
+ remember that there are more methods called. */
+ impl = method;
+ if (get_entity_peculiarity(method) == peculiarity_inherited)
+ impl = get_inherited_methods_implementation(method);
+
+ if (get_entity_peculiarity(method) != peculiarity_description) {
+ eset_insert(set, impl);
++(*size);
- }
- }
}
- /** recursive descend **/
+
+ /*- recursive descent -*/
for (i = get_entity_n_overwrittenby(method) - 1; i >= 0; --i)
collect_impls(get_entity_overwrittenby(method, i), set, size, open);
}
-
-/* Alle Methoden bestimmen, die die übergebene Methode überschreiben
- * (und implementieren). In der zurückgegebenen Reihung kommt jede
- * Methode nur einmal vor. Der Wert 'NULL' steht für unbekannte
- * (externe) Methoden. Die zurückgegebene Reihung muß vom Aufrufer
- * wieder freigegeben werden (siehe "DEL_ARR_F"). Gibt es überhaupt
- * keine Methoden, die die "method" überschreiben, so gibt die Methode
- * "NULL" zurück. */
-static entity ** get_impl_methods(entity * method) {
+/** Alle Methoden bestimmen, die die übergebene Methode überschreiben
+ * (und implementieren). In der zurückgegebenen Reihung kommt jede
+ * Methode nur einmal vor. Der Wert 'NULL' steht für unbekannte
+ * (externe) Methoden. Die zurückgegebene Reihung muß vom Aufrufer
+ * wieder freigegeben werden (siehe "DEL_ARR_F"). Gibt es überhaupt
+ * keine Methoden, die "method" überschreiben, so gibt die Methode
+ * "NULL" zurück.
+ *
+ * @param method
+ */
+static ir_entity ** get_impl_methods(ir_entity * method) {
eset * set = eset_create();
int size = 0;
- entity ** arr;
- bool open = false;
+ ir_entity ** arr;
+ int open = 0;
- /** Collect all method entities that can be called here **/
+ /* Collect all method entities that can be called here */
collect_impls(method, set, &size, &open);
-/**
- Vorgaenger einfuegen. **/
+ /* Vorgaenger einfuegen. */
if (size == 0 && !open) {
/* keine implementierte überschriebene Methode */
arr = NULL;
} else if (open) {
- entity * ent;
- arr = NEW_ARR_F(entity *, size + 1);
+ ir_entity * ent;
+ arr = NEW_ARR_F(ir_entity *, size + 1);
arr[0] = NULL; /* Represents open method */
for (ent = eset_first(set); size > 0; ent = eset_next(set), --size)
arr[size] = ent;
} else {
- entity * ent;
- arr = NEW_ARR_F(entity *, size);
+ ir_entity * ent;
+ arr = NEW_ARR_F(ir_entity *, size);
for (size -= 1, ent = eset_first(set); size >= 0; ent = eset_next(set), --size)
arr[size] = ent;
}
return arr;
}
+/** Analyze address computations.
+ *
+ * Compute for all Sel nodes the set of methods that can be selected.
+ * For each entity we store the set of subentities in the link field.
+ *
+ * Further do some optimizations:
+ * - Call standard optimizations for Sel nodes: this removes polymorphic
+ * calls.
+ * - If the node is a SymConst(name) replace it by SymConst(ent) if possible.
+ * For this we precomputed a map name->entity. Nowadays, we no more support
+ * this and assert.
+ * - If the node is a Sel:
+ * If we found only a single method that can be called, replace the Sel
+ * by a SymConst. This is more powerful than the analysis in opt_polymorphy,
+ * as here we walk the type graph. In opt_polymorphy we only apply a local
+ * pattern.
+ *
+ * @param node The node to analyze
+ * @param env A map that maps names of entities to the entities.
+ */
+static void sel_methods_walker(ir_node * node, void *env) {
+ pmap *ldname_map = env;
+ ir_entity **arr;
+
+ /* Call standard optimizations */
+ if (is_Sel(node)) {
+ ir_node *new_node = optimize_in_place(node);
+ if (node != new_node)
+ exchange(node, new_node);
+ }
-/* debug makros used in sel_methods_walker */
-#define SIZ(x) sizeof(x)/sizeof((x)[0])
-
-#define DBG_OPT_NORMALIZE \
- __dbg_info_merge_pair(new_node, node, dbg_const_eval)
-#define DBG_OPT_POLY_ALLOC \
- do { \
- ir_node *ons[2]; \
- ons[0] = node; \
- ons[1] = skip_Proj(get_Sel_ptr(node)); \
- __dbg_info_merge_sets(&new_node, 1, ons, SIZ(ons), dbg_rem_poly_call); \
- } while(0)
-#define DBG_OPT_POLY \
- __dbg_info_merge_pair(new_node, node, dbg_rem_poly_call)
-
-
-static void sel_methods_walker(ir_node * node, pmap * ldname_map) {
- if (intern_get_irn_op(node) == op_SymConst) {
- /* Wenn möglich SymConst-Operation durch Const-Operation
- * ersetzen. */
- if (get_SymConst_kind(node) == linkage_ptr_info) {
- pmap_entry * entry = pmap_find(ldname_map, (void *) get_SymConst_ptrinfo(node));
+ /* replace SymConst(name)-operations by SymConst(ent) */
+ if (get_irn_op(node) == op_SymConst) {
+ if (get_SymConst_kind(node) == symconst_addr_name) {
+ pmap_entry * entry = pmap_find(ldname_map, (void *) get_SymConst_name(node));
if (entry != NULL) { /* Method is declared in the compiled code */
- entity * ent = entry->value;
- if (get_opt_normalize() && (get_entity_visibility(ent) != visibility_external_allocated)) { /* Meth. is defined */
- ir_node *new_node;
- assert(get_entity_irg(ent));
- set_irg_current_block(current_ir_graph, get_nodes_Block(node));
- new_node = new_d_Const(get_irn_dbg_info(node),
- mode_P_mach, new_tarval_from_entity(ent, mode_P_mach)); DBG_OPT_NORMALIZE;
- exchange(node, new_node);
- }
+ assert(0 && "There should not be a SymConst[addr_name] addressing a method with an implementation"
+ "in this compilation unit. Use a SymConst[addr_ent].");
}
}
- } else if (intern_get_irn_op(node) == op_Sel &&
- is_method_type(get_entity_type(get_Sel_entity(node)))) {
- entity * ent = get_Sel_entity(node);
- if (get_opt_optimize() && get_opt_dyn_meth_dispatch() &&
- (intern_get_irn_op(skip_Proj(get_Sel_ptr(node))) == op_Alloc)) {
- ir_node *new_node;
- entity *called_ent;
- /* We know which method will be called, no dispatch necessary. */
-#if 0
- assert(get_entity_peculiarity(ent) != peculiarity_description);
- set_irg_current_block(current_ir_graph, get_nodes_Block(node));
- /* @@@ Is this correct?? Alloc could reference a subtype of the owner
- of Sel that overwrites the method referenced in Sel. */
- /* @@@ Yes, this is wrong. GL, 10.3.04 */
- new_node = copy_const_value(get_atomic_ent_value(ent)); DBG_OPT_POLY_ALLOC;
-#else
- called_ent = resolve_ent_polymorphy(get_Alloc_type(skip_Proj(get_Sel_ptr(node))), ent);
- set_irg_current_block(current_ir_graph, get_nodes_Block(node));
- /* called_ent may not be description: has no Address/Const to Call! */
- assert(get_entity_peculiarity(called_ent) != peculiarity_description);
- new_node = copy_const_value(get_atomic_ent_value(called_ent)); DBG_OPT_POLY_ALLOC;
-#endif
- exchange (node, new_node);
- } else {
- assert(get_entity_peculiarity(ent) != peculiarity_inherited);
- if (!eset_contains(entities, ent)) {
- /* Entity noch nicht behandelt. Alle (intern oder extern)
- * implementierten Methoden suchen, die diese Entity
- * überschreiben. Die Menge an entity.link speichern. */
- set_entity_link(ent, get_impl_methods(ent));
- eset_insert(entities, ent);
- }
- if (get_entity_link(ent) == NULL) {
- /* Die Sel-Operation kann nie einen Zeiger auf eine aufrufbare
- * Methode zurückgeben. Damit ist sie insbesondere nicht
- * ausführbar und nicht erreichbar. */
- /* Gib eine Warnung aus wenn die Entitaet eine Beschreibung ist
- fuer die es keine Implementierung gibt. */
- if (get_entity_peculiarity(ent) == peculiarity_description) {
- /* @@@ GL Methode um Fehler anzuzeigen aufrufen! */
- printf("WARNING: Calling method description %s\n in method %s\n of class %s\n which has "
- "no implementation!\n", get_entity_name(ent),
- get_entity_name(get_irg_ent(current_ir_graph)),
- get_type_name(get_entity_owner(get_irg_ent(current_ir_graph))));
- printf("This happens when compiling a Java Interface that's never really used, i.e., "
- "no class implementing the interface is ever used.\n");
- } else {
- exchange(node, new_Bad());
- }
- } else {
- entity ** arr = get_entity_link(ent);
-
-#if 0
- int i;
- printf("\nCall site "); DDMN(node);
- printf(" in "); DDME(get_irg_ent(current_ir_graph));
- printf(" can call:\n");
- for (i = 0; i < ARR_LEN(arr); i++) {
- printf(" - "); DDME(arr[i]);
- printf(" with owner "); DDMT(get_entity_owner(arr[i]));
+ }
+ else if (get_irn_op(node) == op_Sel &&
+ is_Method_type(get_entity_type(get_Sel_entity(node)))) {
+ ir_entity * ent = get_SymConst_entity(get_atomic_ent_value(get_Sel_entity(node)));
+ assert(get_entity_peculiarity(ent) != peculiarity_inherited);
+
+ if (!eset_contains(entities, ent)) {
+ /* Entity not yet handled. Find all (internal or external)
+ * implemented methods that overwrites this entity.
+ * This set is stored in the entity link. */
+ set_entity_link(ent, get_impl_methods(ent));
+ eset_insert(entities, ent);
}
- printf("\n");
-#endif
- if (get_opt_optimize() && get_opt_dyn_meth_dispatch() &&
+ /* -- As an add on we get an optimization that removes polymorphic calls.
+ This optimization is more powerful than that in transform_node_Sel(). -- */
+ arr = get_entity_link(ent);
+ if (arr == NULL) {
+ /*
+ * The Sel node never returns a pointer to a usable method.
+ * We could not call it, but it may be description:
+ * We call a method in a dead part of the program.
+ */
+ assert (get_entity_peculiarity(ent) == peculiarity_description);
+ }
+ else if (get_opt_optimize() && get_opt_closed_world() && get_opt_dyn_meth_dispatch() &&
(ARR_LEN(arr) == 1 && arr[0] != NULL)) {
ir_node *new_node;
- /* Die Sel-Operation kann immer nur einen Wert auf eine
- * interne Methode zurückgeben. Wir können daher die
- * Sel-Operation durch eine Const- bzw. SymConst-Operation
- * ersetzen. */
- set_irg_current_block(current_ir_graph, get_nodes_Block(node));
- new_node = copy_const_value(get_atomic_ent_value(arr[0])); DBG_OPT_POLY;
- exchange (node, new_node);
- }
- }
+
+ /*
+ * The Sel node returns only one possible method.
+ * So we could replace the Sel node by a SymConst.
+ * This method must exists.
+ */
+ set_irg_current_block(current_ir_graph, get_nodes_block(node));
+ assert(get_entity_peculiarity(get_SymConst_entity(get_atomic_ent_value(arr[0]))) ==
+ peculiarity_existent);
+ new_node = copy_const_value(get_irn_dbg_info(node), get_atomic_ent_value(arr[0]));
+ DBG_OPT_POLY(node, new_node);
+ exchange(node, new_node);
}
}
}
-
-/* Datenstruktur initialisieren. Zusätzlich werden alle
- * SymConst-Operationen, die auf interne Methoden verweisen, durch
- * Const-Operationen ersetzt. */
+/** Initialize auxiliary data structures.
+ *
+ * Computes a set of entities that overwrite an entity and contain
+ * an implementation. The set is stored in the entity's link field.
+ *
+ * Further replaces Sel nodes where this set contains exactly one
+ * method by SymConst nodes.
+ * Finally asserts if there is a SymConst(name) if there could be a
+ * SymConst(ent). */
static void sel_methods_init(void) {
int i;
- pmap * ldname_map = pmap_create();
+ pmap * ldname_map = pmap_create(); /* Map entity names to entities: to replace
+ SymConst(name) by SymConst(ent). */
assert(entities == NULL);
entities = eset_create();
for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
- entity * ent = get_irg_ent(get_irp_irg(i));
- /* Nur extern sichtbare Methode können überhaupt mit SymConst
- * aufgerufen werden. */
+ ir_entity * ent = get_irg_entity(get_irp_irg(i));
+ /* only external visible methods are allowed to call by a SymConst_ptr_name */
if (get_entity_visibility(ent) != visibility_local) {
pmap_insert(ldname_map, (void *) get_entity_ld_ident(ent), ent);
}
}
- all_irg_walk((irg_walk_func *) sel_methods_walker, NULL, ldname_map);
+
+ all_irg_walk(sel_methods_walker, NULL, ldname_map);
pmap_destroy(ldname_map);
}
-/*****************************************************************************/
-
-/* Datenstruktur freigeben. */
-static void sel_methods_dispose(void) {
- entity * ent;
- assert(entities);
- for (ent = eset_first(entities); ent; ent = eset_next(entities)) {
- entity ** arr = get_entity_link(ent);
- if (arr) {
- DEL_ARR_F(arr);
- }
- set_entity_link(ent, NULL);
- }
- eset_destroy(entities);
- entities = NULL;
-}
+/*--------------------------------------------------------------------------*/
+/* Find free methods.
+ *
+ * We expect that each entity has an array with all implementations in its
+ * link field. */
+/*--------------------------------------------------------------------------*/
+/**
+ * Returns an array of all methods that could be called at a Sel node.
+ * This array contains every entry only once.
+ *
+ * @param sel the Sel node
+ */
+static ir_entity ** get_Sel_arr(ir_node * sel) {
+ static ir_entity ** NULL_ARRAY = NULL;
+ ir_entity * ent;
+ ir_entity ** arr;
-/* Gibt die Menge aller Methoden zurück, die an diesem Sel-Knoten
- * zurückgegeben werden können. Die Liste enthält keine doppelten
- * Einträge. */
-static entity ** get_Sel_arr(ir_node * sel) {
- static entity ** NULL_ARRAY = NULL;
- entity * ent;
- entity ** arr;
- assert(sel && intern_get_irn_op(sel) == op_Sel);
+ assert(is_Sel(sel));
ent = get_Sel_entity(sel);
- assert(is_method_type(get_entity_type(ent))); /* what else? */
+ ent = get_inherited_methods_implementation(ent);
+
+ assert(is_Method_type(get_entity_type(ent))); /* what else? */
arr = get_entity_link(ent);
if (arr) {
return arr;
/* "NULL" zeigt an, dass keine Implementierung existiert. Dies
* kann für polymorphe (abstrakte) Methoden passieren. */
if (!NULL_ARRAY) {
- NULL_ARRAY = NEW_ARR_F(entity *, 0);
+ NULL_ARRAY = NEW_ARR_F(ir_entity *, 0);
}
return NULL_ARRAY;
}
}
-
+/**
+ * Returns the number of possible called methods at a Sel node.
+ *
+ * @param sel the Sel node
+ */
static int get_Sel_n_methods(ir_node * sel) {
return ARR_LEN(get_Sel_arr(sel));
}
-
-static entity * get_Sel_method(ir_node * sel, int pos) {
- entity ** arr = get_Sel_arr(sel);
+/**
+ * Returns the ith possible called method entity at a Sel node.
+ */
+static ir_entity * get_Sel_method(ir_node * sel, int pos) {
+ ir_entity ** arr = get_Sel_arr(sel);
assert(pos >= 0 && pos < ARR_LEN(arr));
return arr[pos];
}
+static void free_mark(ir_node * node, eset * set);
+static void free_mark_proj(ir_node * node, long n, eset * set) {
+ assert(get_irn_mode(node) == mode_T);
+ if (get_irn_link(node) == MARK) {
+ /* already visited */
+ return;
+ }
+ set_irn_link(node, MARK);
+ switch (get_irn_opcode(node)) {
+ case iro_Proj: {
+ /* proj_proj: in einem "sinnvollen" Graphen kommt jetzt ein
+ * op_Tuple oder ein Knoten, der in "free_ana_walker" behandelt
+ * wird. */
+ ir_node * pred = get_Proj_pred(node);
+ if (get_irn_link(pred) != MARK && get_irn_op(pred) == op_Tuple) {
+ free_mark_proj(get_Tuple_pred(pred, get_Proj_proj(node)), n, set);
+ } else {
+ /* nothing: da in "free_ana_walker" behandelt. */
+ }
+ break;
+ }
-/* --- callee analysis ------------------------------------------------------ */
+ case iro_Tuple:
+ free_mark(get_Tuple_pred(node, n), set);
+ break;
+ case iro_Id:
+ free_mark_proj(get_Id_pred(node), n, set);
+ break;
-static void callee_ana_node(ir_node * node, eset * methods);
+ case iro_Start:
+ case iro_Alloc:
+ case iro_Load:
+ /* nothing: Die Operationen werden in free_ana_walker() selbst
+ * behandelt. */
+ break;
+
+ default:
+ assert(0 && "unexpected opcode or opcode not implemented");
+ break;
+ }
+ set_irn_link(node, NULL);
+}
+
+/**
+ * Called for predecessors nodes of "interesting" ones.
+ * Interesting ones include all nodes that can somehow make
+ * a method visible.
+ *
+ * If a method (or a set of methods in case of polymorph calls) gets visible,
+ * add it to the set of 'free' methods
+ *
+ * @param node the current visited node
+ * @param set the set of all free methods
+ */
+static void free_mark(ir_node *node, eset * set) {
+ int i;
+
+ if (get_irn_link(node) == MARK)
+ return; /* already visited */
+
+ set_irn_link(node, MARK);
+
+ switch (get_irn_opcode(node)) {
+ case iro_Sel: {
+ ir_entity * ent = get_Sel_entity(node);
+ if (is_Method_type(get_entity_type(ent))) {
+ for (i = get_Sel_n_methods(node) - 1; i >= 0; --i) {
+ eset_insert(set, get_Sel_method(node, i));
+ }
+ }
+ break;
+ }
+ case iro_SymConst:
+ if (get_SymConst_kind(node) == symconst_addr_ent) {
+ ir_entity * ent = get_SymConst_entity(node);
+ if (is_Method_type(get_entity_type(ent))) {
+ eset_insert(set, ent);
+ }
+ } else {
+ assert(get_SymConst_kind(node) == symconst_addr_name);
+ /* nothing: SymConst points to extern method */
+ }
+ break;
+
+ case iro_Phi:
+ for (i = get_Phi_n_preds(node) - 1; i >= 0; --i) {
+ free_mark(get_Phi_pred(node, i), set);
+ }
+ break;
+ case iro_Id:
+ free_mark(get_Id_pred(node), set);
+ break;
+ case iro_Proj:
+ free_mark_proj(get_Proj_pred(node), get_Proj_proj(node), set);
+ break;
+ default:
+ /* nothing: Wird unten behandelt! */
+ break;
+ }
+ set_irn_link(node, NULL);
+}
+
+/**
+ * post-walker. Find method addresses.
+ */
+static void free_ana_walker(ir_node *node, void *env) {
+ eset *set = env;
+ int i;
+
+ if (get_irn_link(node) == MARK) {
+ /* already visited */
+ return;
+ }
+ switch (get_irn_opcode(node)) {
+ /* special nodes */
+ case iro_Sel:
+ case iro_SymConst:
+ case iro_Const:
+ case iro_Phi:
+ case iro_Id:
+ case iro_Proj:
+ case iro_Tuple:
+ /* nothing */
+ break;
+ /* Sonderbehandlung, da der Funktionszeigereingang natürlich kein
+ * Verräter ist. */
+ case iro_Call:
+ set_irn_link(node, MARK);
+ for (i = get_Call_n_params(node) - 1; i >= 0; --i) {
+ ir_node *pred = get_Call_param(node, i);
+ if (mode_is_reference(get_irn_mode(pred))) {
+ free_mark(pred, set);
+ }
+ }
+ break;
+ /* other nodes: Alle anderen Knoten nehmen wir als Verräter an, bis
+ * jemand das Gegenteil implementiert. */
+ default:
+ set_irn_link(node, MARK);
+ for (i = get_irn_arity(node) - 1; i >= 0; --i) {
+ ir_node * pred = get_irn_n(node, i);
+ if (mode_is_reference(get_irn_mode(pred))) {
+ free_mark(pred, set);
+ }
+ }
+ break;
+ }
+ set_irn_link(node, NULL);
+}
+
+/**
+ * Add all method addresses in global initializers to the set.
+ *
+ * @note
+ * We do NOT check the type here, just it it's an entity address.
+ * The reason for this is code like:
+ *
+ * void *p = function;
+ *
+ * which is sometimes used to anchor functions.
+ */
+static void add_method_address(ir_entity *ent, eset *set)
+{
+ ir_node *n;
+ ir_type *tp;
+ int i;
+
+ /* do not check uninitialized values */
+ if (get_entity_variability(ent) == variability_uninitialized)
+ return;
+
+ if (is_atomic_entity(ent)) {
+ tp = get_entity_type(ent);
+
+ /* ignore methods: these of course reference it's address */
+ if (is_Method_type(tp))
+ return;
+ /* let's check if it's the address of a function */
+ n = get_atomic_ent_value(ent);
+ if (get_irn_op(n) == op_SymConst) {
+ if (get_SymConst_kind(n) == symconst_addr_ent) {
+ ent = get_SymConst_entity(n);
+
+ if (is_Method_type(get_entity_type(ent)))
+ eset_insert(set, ent);
+ }
+ }
+ }
+ else {
+ for (i = get_compound_ent_n_values(ent) - 1; i >= 0; --i) {
+ n = get_compound_ent_value(ent, i);
+
+ /* let's check if it's the address of a function */
+ if (get_irn_op(n) == op_SymConst) {
+ if (get_SymConst_kind(n) == symconst_addr_ent) {
+ ir_entity *ent = get_SymConst_entity(n);
+
+ if (is_Method_type(get_entity_type(ent)))
+ eset_insert(set, ent);
+ }
+ }
+ }
+ }
+}
+
+/**
+ * returns a list of 'free' methods, i.e., the methods that can be called
+ * from external or via function pointers.
+ *
+ * Die Datenstrukturen für sel-Methoden (sel_methods) muß vor dem
+ * Aufruf von "get_free_methods" aufgebaut sein. Die (internen)
+ * SymConst(name)-Operationen müssen in passende SymConst(ent)-Operationen
+ * umgewandelt worden sein, d.h. SymConst-Operationen verweisen immer
+ * auf eine echt externe Methode.
+ */
+static ir_entity ** get_free_methods(void)
+{
+ eset *free_set = eset_create();
+ int i;
+ ir_entity **arr = NEW_ARR_F(ir_entity *, 0);
+ ir_entity *ent;
+ ir_graph *irg;
+ ir_type *glob;
+
+ for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
+ irg = get_irp_irg(i);
+ ent = get_irg_entity(irg);
+ /* insert "external visible" methods. */
+ if (get_entity_visibility(ent) != visibility_local) {
+ eset_insert(free_set, ent);
+ }
+ /* Finde alle Methoden die in dieser Methode extern sichtbar werden,
+ z.B. da die Adresse einer Methode abgespeichert wird. */
+ irg_walk_graph(irg, NULL, free_ana_walker, free_set);
+ }
+
+ /* insert sticky methods, too */
+ for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
+ ent = get_irg_entity(get_irp_irg(i));
+ /* insert "sticky" methods. */
+ if (get_entity_stickyness (ent) == stickyness_sticky) {
+ eset_insert(free_set, ent);
+ }
+ }
+
+ /* insert all methods the initializes global variables */
+ glob = get_glob_type();
+ for (i = get_class_n_members(glob) - 1; i >= 0; --i) {
+ ent = get_class_member(glob, i);
+
+ add_method_address(ent, free_set);
+ }
+
+ /* the main program is even then "free", if it's not external visible. */
+ irg = get_irp_main_irg();
+ if (irg)
+ eset_insert(free_set, get_irg_entity(irg));
+
+ /* Finally, transform the set into an array. */
+ for (ent = eset_first(free_set); ent; ent = eset_next(free_set)) {
+ ARR_APP1(ir_entity *, arr, ent);
+ }
+ eset_destroy(free_set);
+
+ return arr;
+}
+
+/*--------------------------------------------------------------------------*/
+/* Callee analysis. */
+/*--------------------------------------------------------------------------*/
+
+static void callee_ana_node(ir_node * node, eset * methods);
static void callee_ana_proj(ir_node * node, long n, eset * methods) {
assert(get_irn_mode(node) == mode_T);
}
set_irn_link(node, MARK);
- switch (intern_get_irn_opcode(node)) {
+ switch (get_irn_opcode(node)) {
case iro_Proj: {
/* proj_proj: in einem "sinnvollen" Graphen kommt jetzt ein
* op_Tuple oder ein Knoten, der eine "freie Methode"
* zurückgibt. */
ir_node * pred = get_Proj_pred(node);
if (get_irn_link(pred) != MARK) {
- if (intern_get_irn_op(pred) == op_Tuple) {
- callee_ana_proj(get_Tuple_pred(pred, get_Proj_proj(node)), n, methods);
+ if (get_irn_op(pred) == op_Tuple) {
+ callee_ana_proj(get_Tuple_pred(pred, get_Proj_proj(node)), n, methods);
} else {
- eset_insert(methods, MARK); /* free method -> unknown */
+ eset_insert(methods, MARK); /* free method -> unknown */
}
}
break;
set_irn_link(node, NULL);
}
-
-static void callee_ana_node(ir_node * node, eset * methods) {
+/**
+ * Analyse a Call address.
+ *
+ * @param node the node representing the call address
+ * @param methods after call contains the set of all possibly called entities
+ */
+static void callee_ana_node(ir_node *node, eset *methods) {
int i;
assert(mode_is_reference(get_irn_mode(node)) || is_Bad(node));
- /* rekursion verhindern */
+ /* Beware of recursion */
if (get_irn_link(node) == MARK) {
/* already visited */
return;
}
set_irn_link(node, MARK);
- switch (intern_get_irn_opcode(node)) {
- case iro_SymConst:
- /* externe Methode (wegen fix_symconst!) */
+ switch (get_irn_opcode(node)) {
+ case iro_Const:
+ /* A direct address call. We tread this as an external
+ call and ignore it completely. */
eset_insert(methods, MARK); /* free method -> unknown */
break;
-
- case iro_Const: {
- /* interne Methode */
- entity * ent = tarval_to_entity(get_Const_tarval(node));
- assert(ent && is_method_type(get_entity_type(ent)));
- if (get_entity_visibility(ent) != visibility_external_allocated) {
- assert(get_entity_irg(ent));
+ case iro_SymConst:
+ if (get_SymConst_kind(node) == symconst_addr_ent) {
+ ir_entity *ent = get_SymConst_entity(node);
+ assert(ent && is_Method_type(get_entity_type(ent)));
eset_insert(methods, ent);
} else {
+ assert(get_SymConst_kind(node) == symconst_addr_name);
+ /* externe Methode (wegen fix_symconst!) */
eset_insert(methods, MARK); /* free method -> unknown */
}
break;
- }
-
case iro_Sel:
/* polymorphe Methode */
for (i = get_Sel_n_methods(node) - 1; i >= 0; --i) {
- entity * ent = get_Sel_method(node, i);
+ ir_entity * ent = get_Sel_method(node, i);
if (ent) {
- eset_insert(methods, ent);
+ eset_insert(methods, ent);
} else {
- eset_insert(methods, MARK);
+ eset_insert(methods, MARK);
}
}
break;
/* nothing */
break;
- case iro_Phi: /* Vereinigung */
+ case iro_Phi:
for (i = get_Phi_n_preds(node) - 1; i >= 0; --i) {
callee_ana_node(get_Phi_pred(node, i), methods);
}
break;
+ case iro_Mux:
+ callee_ana_node(get_Mux_false(node), methods);
+ callee_ana_node(get_Mux_true(node), methods);
+ break;
+
+ case iro_Psi:
+ for (i = get_Psi_n_conds(node) - 1; i >= 0; --i) {
+ callee_ana_node(get_Psi_val(node, i), methods);
+ }
+ callee_ana_node(get_Psi_default(node), methods);
+ break;
+
case iro_Id:
callee_ana_node(get_Id_pred(node), methods);
break;
set_irn_link(node, NULL);
}
-
+/**
+ * Walker: Analyses every call node and calculates an array of possible
+ * callees for that call.
+ */
static void callee_walker(ir_node * call, void * env) {
- if (intern_get_irn_op(call) == op_Call) {
+ if (is_Call(call)) {
eset * methods = eset_create();
- entity * ent;
- entity ** arr = NEW_ARR_F(entity *, 0);
- callee_ana_node(skip_nop(get_Call_ptr(call)), methods);
+ ir_entity * ent;
+ ir_entity ** arr = NEW_ARR_F(ir_entity *, 0);
+ assert(get_irn_op(get_Call_ptr(call)) != op_Id);
+ callee_ana_node(get_Call_ptr(call), methods);
if (eset_contains(methods, MARK)) { /* unknown method */
- ARR_APP1(entity *, arr, NULL);
+ ARR_APP1(ir_entity *, arr, unknown_entity);
}
for (ent = eset_first(methods); ent; ent = eset_next(methods)) {
if (ent != MARK) {
- ARR_APP1(entity *, arr, ent);
+ ARR_APP1(ir_entity *, arr, ent);
}
}
- if (ARR_LEN(arr) == 0) {
+#if 0 /* This generates Bad nodes when we don't want it.
+ Call it with a check for valid cgana information in local_optimize. */
+ if (ARR_LEN(arr) == 0 && get_opt_optimize() && get_opt_closed_world() && get_opt_dyn_meth_dispatch()) {
/* Kann vorkommen, wenn der Vorgänger beispielsweise eine
* Sel-Operation war, die keine Methoden zurückgeben
* konnte. Wir ersetzen die Call-Operation ebenfalls durch
* eine Bad-Operation. Die Verlinkung muss wiederhergestellt
* werden! */
- exchange(call, new_Bad());
- } else {
+ ir_node *mem = get_Call_mem(call);
+ turn_into_tuple (call, 5 /* pn_Call_max */);
+ set_Tuple_pred(call, pn_Call_M_regular , mem);
+ set_Tuple_pred(call, pn_Call_T_result , new_Bad());
+ set_Tuple_pred(call, pn_Call_P_value_res_base, new_Bad());
+ set_Tuple_pred(call, pn_Call_X_except , new_Bad()); /* new_Jmp() ?? new_Raise() ?? */
+ set_Tuple_pred(call, pn_Call_M_except , new_Bad());
+
+ } else
+#endif
+ {
set_Call_callee_arr(call, ARR_LEN(arr), arr);
}
DEL_ARR_F(arr);
}
}
+/**
+ * Walker: Removes all tuple.
+ */
+static void remove_Tuples(ir_node *proj, void *env) {
+ ir_node *nn;
+ if (! is_Proj(proj)) return;
+
+ nn = skip_Tuple(proj);
+ if (nn != proj) exchange(proj, nn);
+}
+
/* Bestimmt für jede Call-Operation die Menge der aufrufbaren Methode
* und speichert das Ergebnis in der Call-Operation. (siehe
int i;
/* Alle Graphen analysieren. */
for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
- irg_walk_graph(get_irp_irg(i), callee_walker, NULL, NULL);
- set_irg_callee_info_state(get_irp_irg(i), irg_callee_info_consistent);
- }
-}
-
-
-
-/* --- free method analysis ------------------------------------------------- */
-
-
-static void free_mark(ir_node * node, eset * set);
-
-static void free_mark_proj(ir_node * node, long n, eset * set) {
- assert(get_irn_mode(node) == mode_T);
- if (get_irn_link(node) == MARK) {
- /* already visited */
- return;
- }
- set_irn_link(node, MARK);
- switch (intern_get_irn_opcode(node)) {
- case iro_Proj: {
- /* proj_proj: in einem "sinnvollen" Graphen kommt jetzt ein
- * op_Tuple oder ein Knoten, der in "free_ana_walker" behandelt
- * wird. */
- ir_node * pred = get_Proj_pred(node);
- if (get_irn_link(pred) != MARK && intern_get_irn_op(pred) == op_Tuple) {
- free_mark_proj(get_Tuple_pred(pred, get_Proj_proj(node)), n, set);
- } else {
- /* nothing: da in "free_ana_walker" behandelt. */
- }
- break;
- }
-
- case iro_Tuple:
- free_mark(get_Tuple_pred(node, n), set);
- break;
-
- case iro_Id:
- free_mark_proj(get_Id_pred(node), n, set);
- break;
-
- case iro_Start:
- case iro_Alloc:
- case iro_Load:
- /* nothing: Die Operationen werden in "free_ana_walker" selbst
- * behandelt. */
- break;
-
- default:
- assert(0 && "unexpected opcode or opcode not implemented");
- break;
+ ir_graph *irg = get_irp_irg(i);
+ irg_walk_graph(irg, callee_walker, remove_Tuples, NULL);
+ set_irg_callee_info_state(irg, irg_callee_info_consistent);
}
- set_irn_link(node, NULL);
+ set_irp_callee_info_state(irg_callee_info_consistent);
}
+/*--------------------------------------------------------------------------*/
+/* Cleanup after analyses. */
+/*--------------------------------------------------------------------------*/
-static void free_mark(ir_node * node, eset * set) {
- int i;
- assert(mode_is_reference(get_irn_mode(node)));
- if (get_irn_link(node) == MARK) {
- return; /* already visited */
- }
- set_irn_link(node, MARK);
- switch (intern_get_irn_opcode(node)) {
- case iro_Sel: {
- entity * ent = get_Sel_entity(node);
- if (is_method_type(get_entity_type(ent))) {
- for (i = get_Sel_n_methods(node) - 1; i >= 0; --i) {
- eset_insert(set, get_Sel_method(node, i));
- }
- }
- break;
- }
- case iro_SymConst:
- /* nothing: SymConst points to extern method */
- break;
- case iro_Const: {
- tarval * val = get_Const_tarval(node);
- if (tarval_is_entity(val)) { /* filter null pointer */
- entity * ent = tarval_to_entity(val);
- if (is_method_type(get_entity_type(ent))) {
- eset_insert(set, ent);
- }
- }
- break;
- }
- case iro_Phi:
- for (i = get_Phi_n_preds(node) - 1; i >= 0; --i) {
- free_mark(get_Phi_pred(node, i), set);
+/** Frees intermediate data structures. */
+static void sel_methods_dispose(void) {
+ ir_entity * ent;
+ assert(entities);
+ for (ent = eset_first(entities); ent; ent = eset_next(entities)) {
+ ir_entity ** arr = get_entity_link(ent);
+ if (arr) {
+ DEL_ARR_F(arr);
}
- break;
- case iro_Id:
- free_mark(get_Id_pred(node), set);
- break;
- case iro_Proj:
- free_mark_proj(get_Proj_pred(node), get_Proj_proj(node), set);
- break;
- default:
- /* nothing: Wird unten behandelt! */
- break;
+ set_entity_link(ent, NULL);
}
- set_irn_link(node, NULL);
+ eset_destroy(entities);
+ entities = NULL;
}
+/*--------------------------------------------------------------------------*/
+/* Freeing the callee arrays. */
+/*--------------------------------------------------------------------------*/
-static void free_ana_walker(ir_node * node, eset * set) {
- int i;
- if (get_irn_link(node) == MARK) {
- /* bereits in einem Zyklus besucht. */
- return;
- }
- switch (intern_get_irn_opcode(node)) {
- /* special nodes */
- case iro_Sel:
- case iro_SymConst:
- case iro_Const:
- case iro_Phi:
- case iro_Id:
- case iro_Proj:
- case iro_Tuple:
- /* nothing */
- break;
- /* Sonderbehandlung, da der Funktionszeigereingang natürlich kein
- * Verräter ist. */
- case iro_Call:
- set_irn_link(node, MARK);
- for (i = get_Call_arity(node) - 1; i >= 0; --i) {
- ir_node * pred = get_Call_param(node, i);
- if (mode_is_reference(intern_get_irn_mode(pred))) {
- free_mark(pred, set);
- }
- }
- break;
- /* other nodes: Alle anderen Knoten nehmen wir als Verräter an, bis
- * jemand das Gegenteil implementiert. */
- default:
- set_irn_link(node, MARK);
- for (i = intern_get_irn_arity(node) - 1; i >= 0; --i) {
- ir_node * pred = get_irn_n(node, i);
- if (mode_is_reference(intern_get_irn_mode(pred))) {
- free_mark(pred, set);
- }
- }
- break;
+static void destruct_walker(ir_node * node, void * env) {
+ if (is_Call(node)) {
+ remove_Call_callee_arr(node);
}
- set_irn_link(node, NULL);
}
+/*--------------------------------------------------------------------------*/
+/* Main drivers. */
+/*--------------------------------------------------------------------------*/
-/* Die Datenstrukturen für sel-Methoden (sel_methods) muß vor dem
- * Aufruf von "get_free_methods" aufgebaut sein. Die (internen)
- * SymConst-Operationen müssen in passende Const-Operationen
- * umgewandelt worden sein, d.h. SymConst-Operationen verweisen immer
- * auf eine echt externe Methode. */
-static entity ** get_free_methods(void) {
- eset * set = eset_create();
- int i;
- entity ** arr = NEW_ARR_F(entity *, 0);
- entity * ent;
-
- for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
- ir_graph * irg = get_irp_irg(i);
- entity * ent = get_irg_ent(irg);
- /* insert "external visible" methods. */
- if (get_entity_visibility(ent) != visibility_local) {
- eset_insert(set, ent);
- }
- /* Finde alle Methoden die in dieser Methode extern sichtbar werden,
- z.B. da die Adresse einer Methode abgespeichert wird. */
- irg_walk_graph(irg, NULL, (irg_walk_func *) free_ana_walker, set);
- }
- /* Hauptprogramm ist auch dann frei, wenn es nicht "external
- * visible" ist. */
- if (get_irp_main_irg()) {
- eset_insert(set, get_irg_ent(get_irp_main_irg()));
- }
- /* Wandle Menge in Feld um. Effizienter. */
- for (ent = eset_first(set); ent; ent = eset_next(set)) {
- ARR_APP1(entity *, arr, ent);
- }
- eset_destroy(set);
-
- return arr;
-}
-
-void cgana(int *length, entity ***free_methods) {
- entity ** free_meths;
- int i;
+void cgana(int *length, ir_entity ***free_methods) {
+ ir_entity ** free_meths, **p;
+ /* Optimize Sel/SymConst nodes and compute all methods that implement an entity. */
sel_methods_init();
free_meths = get_free_methods();
callee_ana();
/* Convert the flexible array to an array that can be handled
by standard C. */
- *length = ARR_LEN(free_meths);
- *free_methods = (entity **)malloc(sizeof(entity *) * (*length));
- for (i = 0; i < (*length); i++) (*free_methods)[i] = free_meths[i];
+ p = xmalloc(sizeof(*p) * ARR_LEN(free_meths));
+ memcpy(p, free_meths, ARR_LEN(free_meths) * sizeof(*p));
+
+ *length = ARR_LEN(free_meths);
+ *free_methods = p;
+
DEL_ARR_F(free_meths);
}
+void free_callee_info(ir_graph *irg) {
+ irg_walk_graph(irg, destruct_walker, NULL, NULL);
+ set_irg_callee_info_state(irg, irg_callee_info_none);
+}
+
+void free_irp_callee_info(void) {
+ int i;
+ for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
+ free_callee_info(get_irp_irg(i));
+ }
+}
+
/* Optimize the address expressions passed to call nodes.
- * Alle SymConst-Operationen, die auf interne Methoden verweisen,
- * werden durch Const-Operationen ersetzt.
- * Sel Knoten deren entitaeten nicht ueberschrieben werden, werden
- * durch Const ersetzt.
- * Sel Knoten, fuer die keine Implementierung existiert, werden
- * durch Bad ersetzt. */
+ *
+ * This optimization performs the following transformations for
+ * all ir graphs:
+ * - All SymConst operations that refer to intern methods are replaced
+ * by Const operations referring to the corresponding entity.
+ * - Sel nodes, that select entities that are not overwritten are
+ * replaced by Const nodes referring to the selected entity.
+ * - Sel nodes, for which no method exists at all are replaced by Bad
+ * nodes.
+ * - Sel nodes with a pointer input that is an Alloc node are replaced
+ * by Const nodes referring to the entity that implements the method in
+ * the type given by the Alloc node.
+ */
void opt_call_addrs(void) {
sel_methods_init();
sel_methods_dispose();
-#if 0
- int i;
- pmap * ldname_map = pmap_create();
- assert(entities == NULL);
- entities = eset_create();
- for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
- entity * ent = get_irg_ent(get_irp_irg(i));
- /* Nur extern sichtbare Methoden können überhaupt mit SymConst
- * aufgerufen werden. */
- if (get_entity_visibility(ent) != local) {
- pmap_insert(ldname_map, (void *) get_entity_ld_ident(ent), ent);
- }
- }
- all_irg_walk((irg_walk_func *) sel_methods_walker, NULL, ldname_map);
- pmap_destroy(ldname_map);
-#endif
}
projects / libfirm / blobdiff