-/* Copyright (C) 1998 - 2000 by Universitaet Karlsruhe
-** All rights reserved.
-**
-** Author: Boris Boesler
-**
-** traverse an ir graph
-** - execute the pre function before recursion
-** - execute the post function after recursion
-*/
-
-/* $Id$ */
-
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-# include "irnode.h"
-# include "irgraph.h" /* visited flag */
-# include "irprog.h"
+/*
+ * Copyright (C) 1995-2011 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 Functions for traversing ir graphs
+ * @author Boris Boesler, Goetz Lindenmaier, Michael Beck
+ * @version $Id$
+ * @brief
+ * traverse an ir graph
+ * - execute the pre function before recursion
+ * - execute the post function after recursion
+ */
+#include "config.h"
+
+#include <stdlib.h>
+
+#include "irnode_t.h"
+#include "irgraph_t.h"
+#include "irprog.h"
+#include "irgwalk.h"
+#include "irhooks.h"
+#include "entity_t.h"
+
+#include "error.h"
+#include "pset_new.h"
+#include "array.h"
+
+/**
+ * specialized version of irg_walk_2, called if only pre callback exists
+ *
+ * @return number of visited nodes
+ */
+static unsigned irg_walk_2_pre(ir_node *node, irg_walk_func *pre, void *env)
+{
+ int i;
+ unsigned cnt = 1;
+ ir_graph *irg = get_irn_irg(node);
+
+ set_irn_visited(node, irg->visited);
+
+ pre(node, env);
+
+ if (node->op != op_Block) {
+ ir_node *pred = get_irn_n(node, -1);
+ if (pred->visited < irg->visited)
+ cnt += irg_walk_2_pre(pred, pre, env);
+ }
+ for (i = get_irn_arity(node) - 1; i >= 0; --i) {
+ ir_node *pred = get_irn_n(node, i);
+ if (pred->visited < irg->visited)
+ cnt += irg_walk_2_pre(pred, pre, env);
+ }
+ return cnt;
+}
-void irg_walk_2(ir_node *node,
- void (pre)(ir_node*, void*), void (post)(ir_node*, void*),
- void *env)
+/**
+ * specialized version of irg_walk_2, called if only post callback exists
+ *
+ * @return number of visited nodes
+ */
+static unsigned irg_walk_2_post(ir_node *node, irg_walk_func *post, void *env)
{
- int i;
+ int i;
+ unsigned cnt = 1;
+ ir_graph *irg = get_irn_irg(node);
+
+ set_irn_visited(node, irg->visited);
+
+ if (node->op != op_Block) {
+ ir_node *pred = get_irn_n(node, -1);
+ if (pred->visited < irg->visited)
+ cnt += irg_walk_2_post(pred, post, env);
+ }
+ for (i = get_irn_arity(node) - 1; i >= 0; --i) {
+ ir_node *pred = get_irn_n(node, i);
+ if (pred->visited < irg->visited)
+ cnt += irg_walk_2_post(pred, post, env);
+ }
+
+ post(node, env);
+
+ return cnt;
+}
+/**
+ * specialized version of irg_walk_2, called if pre and post callbacks exist
+ *
+ * @return number of visited nodes
+ */
+static unsigned irg_walk_2_both(ir_node *node, irg_walk_func *pre,
+ irg_walk_func *post, void *env)
+{
+ int i;
+ unsigned cnt = 1;
+ ir_graph *irg = get_irn_irg(node);
- assert(node);
- /* printf(" - "); DDMSG2(node); */
+ set_irn_visited(node, irg->visited);
- if (get_irn_visited(node) < get_irg_visited(current_ir_graph)) {
+ pre(node, env);
-/* printf(" -> "); DDMSG2(node); */
- set_irn_visited(node, get_irg_visited(current_ir_graph));
+ if (node->op != op_Block) {
+ ir_node *pred = get_irn_n(node, -1);
+ if (pred->visited < irg->visited)
+ cnt += irg_walk_2_both(pred, pre, post, env);
+ }
+ for (i = get_irn_arity(node) - 1; i >= 0; --i) {
+ ir_node *pred = get_irn_n(node, i);
+ if (pred->visited < irg->visited)
+ cnt += irg_walk_2_both(pred, pre, post, env);
+ }
- if (pre) {
- pre(node, env);
- }
+ post(node, env);
- if (is_no_Block(node)) {
- irg_walk_2(get_nodes_Block(node), pre, post, env);
- }
- for (i = get_irn_arity(node) - 1; i >= 0; --i) {
- /* printf(" "); DDMSG2(node);
- printf(" "); DDMSG2(get_irn_n(node, i)); */
+ return cnt;
+}
- irg_walk_2(get_irn_n(node, i), pre, post, env);
- }
+/**
+ * Intraprozedural graph walker.
+ *
+ * @return number of visited nodes
+ */
+unsigned irg_walk_2(ir_node *node, irg_walk_func *pre, irg_walk_func *post,
+ void *env)
+{
+ if (irn_visited(node))
+ return 0;
-/* printf(" <- "); DDMSG2(node); */
- if (post)
- post(node, env);
- }
- return;
+ if (!post) return irg_walk_2_pre (node, pre, env);
+ else if (!pre) return irg_walk_2_post(node, post, env);
+ else return irg_walk_2_both(node, pre, post, env);
}
+/* a counter */
+static unsigned nodes_touched = 0;
-void irg_walk(ir_node *node,
- void (pre)(ir_node*, void*), void (post)(ir_node*, void*),
- void *env)
+void irg_walk_core(ir_node *node, irg_walk_func *pre, irg_walk_func *post,
+ void *env)
{
- assert(node);
- inc_irg_visited (current_ir_graph);
- irg_walk_2(node, pre, post, env);
- return;
+ assert(is_ir_node(node));
+ nodes_touched = irg_walk_2(node, pre, post, env);
}
-/***************************************************************************/
+void irg_walk(ir_node *node, irg_walk_func *pre, irg_walk_func *post,
+ void *env)
+{
+ ir_graph *irg = get_irn_irg(node);
+ ir_graph *rem = current_ir_graph;
+
+ current_ir_graph = irg;
+ ir_reserve_resources(irg, IR_RESOURCE_IRN_VISITED);
+ inc_irg_visited(irg);
+ irg_walk_core(node, pre, post, env);
+ ir_free_resources(irg, IR_RESOURCE_IRN_VISITED);
+ current_ir_graph = rem;
+}
+
+/*
+ * walk over a graph
+ */
+void irg_walk_graph(ir_graph *irg, irg_walk_func *pre, irg_walk_func *post, void *env)
+{
+ ir_graph * rem = current_ir_graph;
+
+ hook_irg_walk(irg, (generic_func *)pre, (generic_func *)post);
+ current_ir_graph = irg;
+ irg_walk(get_irg_end(irg), pre, post, env);
+ irg->estimated_node_count = nodes_touched;
+ current_ir_graph = rem;
+}
/* Executes irg_walk(end, pre, post, env) for all irgraphs in irprog.
Sets current_ir_graph properly for each walk. Conserves current
current_ir_graph. */
-void all_irg_walk(void (pre)(ir_node*, void*), void (post)(ir_node*, void*),
- void *env) {
- int i;
- ir_graph *irg, *rem;
-
- rem = current_ir_graph;
+void all_irg_walk(irg_walk_func *pre, irg_walk_func *post, void *env)
+{
+ size_t i, n;
+ ir_graph *irg;
- for (i = 0; i < get_irp_n_irgs(); i++) {
- irg = get_irp_irg(i);
- current_ir_graph = irg;
- irg_walk(get_irg_end(irg), pre, post, env);
- }
- current_ir_graph = rem;
+ for (i = 0, n = get_irp_n_irgs(); i < n; i++) {
+ irg = get_irp_irg(i);
+ irg_walk_graph(irg, pre, post, env);
+ }
}
/***************************************************************************/
-/* Walks back from n until it finds a real cf op. */
-ir_node *get_cf_op(ir_node *n) {
- ir_node *pred;
+/**
+ * specialized version of irg_walk_in_or_dep_2, called if only pre callback exists
+ *
+ * @return number of visited nodes
+ */
+static unsigned irg_walk_in_or_dep_2_pre(ir_node *node, irg_walk_func *pre, void *env)
+{
+ int i;
+ unsigned cnt = 1;
+ ir_graph *irg = get_irn_irg(node);
+
+ set_irn_visited(node, irg->visited);
+
+ pre(node, env);
+
+ if (node->op != op_Block) {
+ ir_node *pred = get_irn_n(node, -1);
+ if (pred->visited < irg->visited)
+ cnt += irg_walk_in_or_dep_2_pre(pred, pre, env);
+ }
+ for (i = get_irn_ins_or_deps(node) - 1; i >= 0; --i) {
+ ir_node *pred = get_irn_in_or_dep(node, i);
+ if (pred->visited < irg->visited)
+ cnt += irg_walk_in_or_dep_2_pre(pred, pre, env);
+ }
+ return cnt;
+}
+
+/**
+ * specialized version of irg_walk_in_or_dep_2, called if only post callback exists
+ *
+ * @return number of visited nodes
+ */
+static unsigned irg_walk_in_or_dep_2_post(ir_node *node, irg_walk_func *post, void *env)
+{
+ int i;
+ unsigned cnt = 1;
+ ir_graph *irg = get_irn_irg(node);
+
+ set_irn_visited(node, irg->visited);
+
+ if (node->op != op_Block) {
+ ir_node *pred = get_irn_n(node, -1);
+ if (pred->visited < irg->visited)
+ cnt += irg_walk_in_or_dep_2_post(pred, post, env);
+ }
+ for (i = get_irn_ins_or_deps(node) - 1; i >= 0; --i) {
+ ir_node *pred = get_irn_in_or_dep(node, i);
+ if (pred->visited < irg->visited)
+ cnt += irg_walk_in_or_dep_2_post(pred, post, env);
+ }
+
+ post(node, env);
+
+ return cnt;
+}
+
+/**
+ * specialized version of irg_walk_in_or_dep_2, called if pre and post callbacks exist
+ *
+ * @return number of visited nodes
+ */
+static unsigned irg_walk_in_or_dep_2_both(ir_node *node, irg_walk_func *pre, irg_walk_func *post, void *env)
+{
+ int i;
+ unsigned cnt = 1;
+ ir_graph *irg = get_irn_irg(node);
- n = skip_nop(n);
- n = skip_Tuple(n);
- pred = skip_Proj(n);
- if (!(is_cfop(pred) || is_fragile_op(pred) ||
- (get_irn_op(pred) == op_Bad)))
- n = get_cf_op(n);
+ set_irn_visited(node, irg->visited);
- return skip_Proj(n);
+ pre(node, env);
+
+ if (node->op != op_Block) {
+ ir_node *pred = get_irn_n(node, -1);
+ if (pred->visited < irg->visited)
+ cnt += irg_walk_in_or_dep_2_both(pred, pre, post, env);
+ }
+ for (i = get_irn_ins_or_deps(node) - 1; i >= 0; --i) {
+ ir_node *pred = get_irn_in_or_dep(node, i);
+ if (pred->visited < irg->visited)
+ cnt += irg_walk_in_or_dep_2_both(pred, pre, post, env);
+ }
+
+ post(node, env);
+
+ return cnt;
}
-void irg_block_walk_2(ir_node *node, void (pre)(ir_node*, void*),
- void (post)(ir_node*, void*), void *env)
+/**
+ * Intraprozedural graph walker. Follows dependency edges as well.
+ *
+ * @return number of visited nodes
+ */
+static unsigned irg_walk_in_or_dep_2(ir_node *node, irg_walk_func *pre, irg_walk_func *post, void *env)
{
- int i;
+ if (irn_visited(node))
+ return 0;
- assert(get_irn_opcode(node) == iro_Block);
+ if (! post) return irg_walk_in_or_dep_2_pre (node, pre, env);
+ else if (! pre) return irg_walk_in_or_dep_2_post(node, post, env);
+ else return irg_walk_in_or_dep_2_both(node, pre, post, env);
+}
- if(get_Block_block_visited(node) < get_irg_block_visited(current_ir_graph)) {
- set_Block_block_visited(node, get_irg_block_visited(current_ir_graph));
+/*
+ * Generic graph walker. Follows dependency edges as well.
+ */
+void irg_walk_in_or_dep(ir_node *node, irg_walk_func *pre, irg_walk_func *post, void *env)
+{
+ assert(is_ir_node(node));
+
+ ir_reserve_resources(current_ir_graph, IR_RESOURCE_IRN_VISITED);
+ inc_irg_visited(current_ir_graph);
+ nodes_touched = irg_walk_in_or_dep_2(node, pre, post, env);
+ ir_free_resources(current_ir_graph, IR_RESOURCE_IRN_VISITED);
+}
- if(pre)
- pre(node, env);
+/*
+ * Walk over a graph. Follow all edges (including dependencies)
+ */
+void irg_walk_in_or_dep_graph(ir_graph *irg, irg_walk_func *pre, irg_walk_func *post, void *env)
+{
+ ir_graph * rem = current_ir_graph;
- for(i = get_Block_n_cfgpreds(node) - 1; i >= 0; --i) {
+ hook_irg_walk(irg, (generic_func *)pre, (generic_func *)post);
+ current_ir_graph = irg;
+ irg_walk_in_or_dep(get_irg_end(irg), pre, post, env);
+ irg->estimated_node_count = nodes_touched;
+ current_ir_graph = rem;
+}
- /* find the corresponding predecessor block. */
- ir_node *pred = get_cf_op(get_Block_cfgpred(node, i));
- /* GL: I'm not sure whether this assert must go through. There
- could be Id chains?? Tuple/Proj .... */
+/***************************************************************************/
- assert(is_cfop(pred) || is_fragile_op(pred) ||
- (get_irn_op(pred) == op_Bad));
- pred = get_nodes_Block(pred);
- if(get_irn_opcode(pred) == iro_Block) {
- /* recursion */
- irg_block_walk_2(pred, pre, post, env);
- }
- else {
- assert(get_irn_opcode(pred) == iro_Bad);
- }
- }
+/* Walks back from n until it finds a real cf op. */
+static ir_node *get_cf_op(ir_node *n)
+{
+ while (!is_cfop(n) && !is_fragile_op(n) && !is_Bad(n)) {
+ n = skip_Id(n);
+ n = skip_Tuple(n);
+ n = skip_Proj(n);
+ }
+ return n;
+}
- if(post)
- post(node, env);
- }
- return;
+static void irg_block_walk_2(ir_node *node, irg_walk_func *pre,
+ irg_walk_func *post, void *env)
+{
+ int i;
+
+ if (Block_block_visited(node))
+ return;
+ mark_Block_block_visited(node);
+
+ if (pre)
+ pre(node, env);
+
+ for (i = get_Block_n_cfgpreds(node) - 1; i >= 0; --i) {
+ /* find the corresponding predecessor block. */
+ ir_node *pred = get_cf_op(get_Block_cfgpred(node, i));
+ pred = get_nodes_block(pred);
+ if (get_irn_opcode(pred) == iro_Block) {
+ /* recursion */
+ irg_block_walk_2(pred, pre, post, env);
+ } else {
+ assert(get_irn_opcode(pred) == iro_Bad);
+ }
+ }
+
+ if (post)
+ post(node, env);
}
/* walks only over Block nodes in the graph. Has it's own visited
flag, so that it can be interleaved with the other walker. */
-void irg_block_walk(ir_node *node,
- void (pre)(ir_node*, void*), void (post)(ir_node*, void*),
- void *env)
-{
- ir_node *block, *pred;
- int i;
-
- assert(node);
- inc_irg_block_visited(current_ir_graph);
- if (is_no_Block(node)) block = get_nodes_Block(node); else block = node;
- assert(get_irn_opcode(block) == iro_Block);
- irg_block_walk_2(block, pre, post, env);
- /* keepalive: the endless loops ... */
- if (get_irn_op(node) == op_End)
- for (i = 0; i < get_irn_arity(node); i++) {
- pred = get_irn_n(node, i);
- if (get_irn_op(pred) == op_Block)
- irg_block_walk_2(pred, pre, post, env);
+void irg_block_walk(ir_node *node, irg_walk_func *pre, irg_walk_func *post, void *env)
+{
+ ir_graph *irg = get_irn_irg(node);
+ ir_node *block, *pred;
+ int i;
+
+ hook_irg_block_walk(irg, node, (generic_func *)pre, (generic_func *)post);
+
+ assert(node);
+ ir_reserve_resources(irg, IR_RESOURCE_BLOCK_VISITED);
+ inc_irg_block_visited(irg);
+ block = is_Block(node) ? node : get_nodes_block(node);
+ assert(is_Block(block));
+ irg_block_walk_2(block, pre, post, env);
+
+ /* keepalive: the endless loops ... */
+ if (is_End(node)) {
+ int arity = get_irn_arity(node);
+ for (i = 0; i < arity; i++) {
+ pred = get_irn_n(node, i);
+ if (!is_Block(pred)) {
+ pred = get_nodes_block(pred);
+ if (!is_Block(pred)) {
+ /* if rare cases a kept node might have a bad block input */
+ continue;
+ }
+ }
+ /* Sometimes the blocks died, but are still reachable through kept nodes.
+ * Make sure the algorithms that try to remove these reach them. */
+ irg_block_walk_2(pred, pre, post, env);
+ }
+ }
+
+ ir_free_resources(irg, IR_RESOURCE_BLOCK_VISITED);
+}
+
+/*
+ * walk over a graph block wise
+ */
+void irg_block_walk_graph(ir_graph *irg, irg_walk_func *pre,
+ irg_walk_func *post, void *env)
+{
+ ir_graph * rem = current_ir_graph;
+ current_ir_graph = irg;
+ irg_block_walk(get_irg_end(irg), pre, post, env);
+ current_ir_graph = rem;
+}
+
+/*
+ * Additionally walk over all anchors. Do NOT increase the visit flag.
+ */
+void irg_walk_anchors(ir_graph *irg, irg_walk_func *pre, irg_walk_func *post, void *env)
+{
+ ir_graph * rem = current_ir_graph;
+ current_ir_graph = irg;
+
+ inc_irg_visited(irg);
+ irg_walk_2(irg->anchor, pre, post, env);
+
+ current_ir_graph = rem;
+}
+
+/********************************************************************/
+
+typedef struct walk_env {
+ irg_walk_func *pre;
+ irg_walk_func *post;
+ void *env;
+} walk_env;
+
+static void walk_initializer(ir_initializer_t *initializer, walk_env *env)
+{
+ switch (initializer->kind) {
+ case IR_INITIALIZER_CONST:
+ irg_walk(initializer->consti.value, env->pre, env->post, env->env);
+ return;
+ case IR_INITIALIZER_TARVAL:
+ case IR_INITIALIZER_NULL:
+ return;
+
+ case IR_INITIALIZER_COMPOUND: {
+ size_t i;
+ for (i = 0; i < initializer->compound.n_initializers; ++i) {
+ ir_initializer_t *subinitializer
+ = initializer->compound.initializers[i];
+ walk_initializer(subinitializer, env);
+ }
+ return;
}
+ }
+ panic("invalid initializer found");
+}
+
+/**
+ * Walk to all constant expressions in this entity.
+ */
+static void walk_entity(ir_entity *ent, void *env)
+{
+ walk_env *my_env = (walk_env *)env;
- return;
+ if (ent->initializer != NULL) {
+ walk_initializer(ent->initializer, my_env);
+ } else if (entity_has_compound_ent_values(ent)) {
+ size_t i, n_vals = get_compound_ent_n_values(ent);
+
+ for (i = 0; i < n_vals; i++)
+ irg_walk(get_compound_ent_value(ent, i), my_env->pre, my_env->post, my_env->env);
+ }
+}
+
+/* Walks over all code in const_code_irg. */
+void walk_const_code(irg_walk_func *pre, irg_walk_func *post, void *env)
+{
+ walk_env my_env;
+ ir_segment_t s;
+ size_t i;
+ size_t n_types;
+
+ ir_graph *rem = current_ir_graph;
+ current_ir_graph = get_const_code_irg();
+ inc_irg_visited(current_ir_graph);
+
+ my_env.pre = pre;
+ my_env.post = post;
+ my_env.env = env;
+
+ /* Walk all types that can contain constant entities. */
+ for (s = IR_SEGMENT_FIRST; s <= IR_SEGMENT_LAST; ++s)
+ walk_types_entities(get_segment_type(s), &walk_entity, &my_env);
+ n_types = get_irp_n_types();
+ for (i = 0; i < n_types; i++)
+ walk_types_entities(get_irp_type(i), &walk_entity, &my_env);
+ for (i = 0; i < get_irp_n_irgs(); i++)
+ walk_types_entities(get_irg_frame_type(get_irp_irg(i)), &walk_entity, &my_env);
+
+ /* Walk constant array bounds. */
+ for (i = 0; i < n_types; i++) {
+ ir_type *tp = get_irp_type(i);
+ if (is_Array_type(tp)) {
+ size_t j, n_dim = get_array_n_dimensions(tp);
+ for (j = 0; j < n_dim; j++) {
+ ir_node *n = get_array_lower_bound(tp, j);
+ if (n) irg_walk(n, pre, post, env);
+ n = get_array_upper_bound(tp, j);
+ if (n) irg_walk(n, pre, post, env);
+ }
+ }
+ }
+
+ current_ir_graph = rem;
}
projects / libfirm / blobdiff