-/* 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
-*/
+/*
+ * Project: libFIRM
+ * File name: ir/ir/irgwalk.c
+ * Purpose:
+ * Author: Boris Boesler
+ * Modified by: Goetz Lindenmaier
+ * Created:
+ * CVS-ID: $Id$
+ * Copyright: (c) 1999-2003 Universität Karlsruhe
+ * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
+ */
+
+/**
+ * @file irgwalk.c
+ *
+ * traverse an ir graph
+ * - execute the pre function before recursion
+ * - execute the post function after recursion
+ */
+
#ifdef HAVE_CONFIG_H
-# include <config.h>
+# include "config.h"
#endif
-# include "irnode.h"
-# include "irgraph.h" /* visited flag */
+#ifdef HAVE_STDLIB_H
+# include <stdlib.h>
+#endif
+#include "irnode_t.h"
+#include "irgraph_t.h" /* visited flag */
+#include "irprog.h"
+#include "irgwalk.h"
+#include "typewalk.h"
+#include "irhooks.h"
+#include "ircgcons.h"
-void irg_walk_2(ir_node *node,
- void (pre)(ir_node*, void*), void (post)(ir_node*, void*),
- void *env)
-{
+#include "eset.h"
+#include "array.h"
+
+/**
+ * Walk over an interprocedural graph (callgraph).
+ * Visits only graphs in irg_set.
+ */
+static void irg_walk_cg(ir_node * node, unsigned long visited, eset * irg_set,
+ irg_walk_func *pre, irg_walk_func *post, void * env) {
int i;
+ ir_graph * rem = current_ir_graph;
+ ir_node * pred;
+ assert(node && node->kind == k_ir_node);
+ if (get_irn_visited(node) >= visited) return;
- assert(node);
- /* printf(" - "); DDMSG2(node); */
+ set_irn_visited(node, visited);
- if (get_irn_visited(node) < get_irg_visited(current_ir_graph)) {
+ if (pre) pre(node, env);
-/* printf(" -> "); DDMSG2(node); */
- set_irn_visited(node, get_irg_visited(current_ir_graph));
+ pred = skip_Proj(node);
+ if (get_irn_op(pred) == op_CallBegin
+ || get_irn_op(pred) == op_EndReg
+ || get_irn_op(pred) == op_EndExcept) {
+ current_ir_graph = get_irn_irg(pred);
+ }
- if (pre) {
- pre(node, env);
+ if (is_no_Block(node)) { /* not block */
+ irg_walk_cg(get_nodes_block(node), visited, irg_set, pre, post, env);
+ }
+
+ if (get_irn_op(node) == op_Block) { /* block */
+ for (i = get_irn_arity(node) - 1; i >= 0; --i) {
+ ir_node * exec = get_irn_n(node, i);
+ ir_node * pred = skip_Proj(exec);
+ if ((get_irn_op(pred) != op_CallBegin
+ && get_irn_op(pred) != op_EndReg
+ && get_irn_op(pred) != op_EndExcept)
+ || eset_contains(irg_set, get_irn_irg(pred))) {
+ irg_walk_cg(exec, visited, irg_set, pre, post, env);
+ }
}
+ } else if (get_irn_op(node) == op_Filter) { /* filter */
+ for (i = get_irn_arity(node) - 1; i >= 0; --i) {
+ ir_node * pred = get_irn_n(node, i);
+ if (get_irn_op(pred) == op_Unknown || get_irn_op(pred) == op_Bad) {
+ irg_walk_cg(pred, visited, irg_set, pre, post, env);
+ } else {
+ ir_node * exec;
+ exec = skip_Proj(get_Block_cfgpred(get_nodes_block(node), i));
- if (is_no_Block(node)) {
- irg_walk_2(get_nodes_Block(node), pre, post, env);
+ if (op_Bad == get_irn_op (exec)) {
+ continue;
+ }
+
+ assert(get_irn_op(exec) == op_CallBegin
+ || get_irn_op(exec) == op_EndReg
+ || get_irn_op(exec) == op_EndExcept);
+ if (eset_contains(irg_set, get_irn_irg(exec))) {
+ current_ir_graph = get_irn_irg(exec);
+ irg_walk_cg(pred, visited, irg_set, pre, post, env);
+ current_ir_graph = rem;
+ }
+ }
}
+ } else { /* everything else */
for (i = get_irn_arity(node) - 1; i >= 0; --i) {
-/* printf(" "); DDMSG2(node); */
-/* printf(" "); DDMSG2(get_irn_n(node, i)); */
+ irg_walk_cg(get_irn_n(node, i), visited, irg_set, pre, post, env);
+ }
+ }
- irg_walk_2(get_irn_n(node, i), pre, post, env);
+ if (post) post(node, env);
+
+ current_ir_graph = rem;
+}
+
+
+/**
+ * Insert all ir_graphs in irg_set, that are (transitive) reachable.
+ */
+static void collect_irgs(ir_node * node, eset * irg_set) {
+ if (is_Call(node)) {
+ int i;
+ for (i = get_Call_n_callees(node) - 1; i >= 0; --i) {
+ entity * ent = get_Call_callee(node, i);
+ ir_graph * irg = get_entity_irg(ent);
+ if (irg && !eset_contains(irg_set, irg)) {
+ eset_insert(irg_set, irg);
+ irg_walk_graph(irg, (irg_walk_func *) collect_irgs, NULL, irg_set);
+ }
}
+ }
+}
+
+/**
+ * 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;
+
+ set_irn_visited(node, current_ir_graph->visited);
+
+ pre(node, env);
+
+ if (node->op != op_Block) {
+ ir_node *pred = get_irn_n(node, -1);
+ if (pred->visited < current_ir_graph->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 < current_ir_graph->visited)
+ cnt += irg_walk_2_pre(pred, pre, env);
+ }
+ return cnt;
+}
+
+/**
+ * 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;
+ unsigned cnt = 1;
+
+ set_irn_visited(node, current_ir_graph->visited);
-/* printf(" <- "); DDMSG2(node); */
- if (post)
- post(node, env);
+ if (node->op != op_Block) {
+ ir_node *pred = get_irn_n(node, -1);
+ if (pred->visited < current_ir_graph->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 < current_ir_graph->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;
+
+ set_irn_visited(node, current_ir_graph->visited);
+
+ pre(node, env);
+
+ if (node->op != op_Block) {
+ ir_node *pred = get_irn_n(node, -1);
+ if (pred->visited < current_ir_graph->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 < current_ir_graph->visited)
+ cnt += irg_walk_2_both(pred, pre, post, env);
+ }
+
+ post(node, env);
+
+ return cnt;
+}
+
+/**
+ * Intraprozedural graph walker.
+ *
+ * @return number of visited nodes
+ */
+static unsigned
+irg_walk_2(ir_node *node, irg_walk_func *pre, irg_walk_func *post, void * env)
+{
+ if (node->visited < current_ir_graph->visited) {
+ 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);
+ }
+ return 0;
+}
+
+/* a counter */
+static unsigned nodes_touched = 0;
+
+/*
+ * generic graph walker
+ */
+void irg_walk(ir_node *node, irg_walk_func *pre, irg_walk_func *post, void *env)
+{
+ assert(is_ir_node(node));
+
+ if (get_interprocedural_view()) {
+ eset * irg_set = eset_create();
+ unsigned long visited;
+ ir_graph * irg;
+ assert(get_irp_ip_view_state() == ip_view_valid);
+
+ set_interprocedural_view(0);
+ eset_insert(irg_set, current_ir_graph);
+ irg_walk(node, (irg_walk_func *) collect_irgs, NULL, irg_set);
+ set_interprocedural_view(1);
+ visited = get_max_irg_visited() + 1;
+ for (irg = eset_first(irg_set); irg; irg = eset_next(irg_set)) {
+ set_irg_visited(irg, visited);
+ }
+ irg_walk_cg(node, visited, irg_set, pre, post, env);
+ eset_destroy(irg_set);
+ } else {
+ inc_irg_visited(current_ir_graph);
+ nodes_touched = irg_walk_2(node, pre, post, env);
}
return;
}
+/*
+ * 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(irg_walk_func *pre, irg_walk_func *post, void *env) {
+ int i;
+ ir_graph *irg, *rem;
+
+ rem = current_ir_graph;
+
+ 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;
+}
+
+/***************************************************************************/
+
+/**
+ * Returns current_ir_graph and sets it to the irg of predecessor index
+ * of node n.
+ */
+static INLINE ir_graph *
+switch_irg (ir_node *n, int index) {
+ ir_graph *old_current = current_ir_graph;
-void irg_walk(ir_node *node,
- void (pre)(ir_node*, void*), void (post)(ir_node*, void*),
- void *env)
+ if (get_interprocedural_view()) {
+ /* Only Filter and Block nodes can have predecessors in other graphs. */
+ if (get_irn_op(n) == op_Filter)
+ n = get_nodes_block(n);
+ if (get_irn_op(n) == op_Block) {
+ ir_node *cfop = skip_Proj(get_Block_cfgpred(n, index));
+ if (is_ip_cfop(cfop)) {
+ current_ir_graph = get_irn_irg(cfop);
+ }
+ }
+ }
+
+ return old_current;
+}
+
+static void
+cg_walk_2(ir_node *node, irg_walk_func *pre, irg_walk_func *post, void * env)
{
+ int i;
+ ir_graph *rem = NULL;
assert(node);
- inc_irg_visited (current_ir_graph);
- irg_walk_2(node, pre, post, env);
+
+ if (get_irn_visited(node) < get_irg_visited(current_ir_graph)) {
+ set_irn_visited(node, get_irg_visited(current_ir_graph));
+
+ if (pre) pre(node, env);
+
+ if (is_no_Block(node))
+ cg_walk_2(get_nodes_block(node), pre, post, env);
+ for (i = get_irn_arity(node) - 1; i >= 0; --i) {
+ rem = switch_irg(node, i); /* @@@ AS: Is this wrong? We do have to
+ switch to the irg of the predecessor, don't we? */
+ cg_walk_2(get_irn_n(node, i), pre, post, env);
+ current_ir_graph = rem;
+ }
+
+ if (post) post(node, env);
+ }
return;
}
+
+/* Walks all irgs in interprocedural view. Visits each node only once. */
+void cg_walk(irg_walk_func *pre, irg_walk_func *post, void *env) {
+ int i;
+ ir_graph *rem = current_ir_graph;
+ int rem_view = get_interprocedural_view();
+
+ set_interprocedural_view(1);
+
+ inc_max_irg_visited();
+ /* Fix all irg_visited flags */
+ for (i = 0; i < get_irp_n_irgs(); i++)
+ set_irg_visited(get_irp_irg(i), get_max_irg_visited());
+
+ /* Walk starting at unreachable procedures. Only these
+ * have End blocks visible in interprocedural view. */
+ for (i = 0; i < get_irp_n_irgs(); i++) {
+ ir_node *sb;
+ current_ir_graph = get_irp_irg(i);
+
+ sb = get_irg_start_block(current_ir_graph);
+
+ if ((get_Block_n_cfgpreds(sb) > 1) ||
+ (get_nodes_block(get_Block_cfgpred(sb, 0)) != sb)) continue;
+
+ cg_walk_2(get_irg_end(current_ir_graph), pre, post, env);
+ }
+
+ /* Check whether we walked all procedures: there could be procedures
+ with cyclic calls but no call from the outside. */
+ for (i = 0; i < get_irp_n_irgs(); i++) {
+ ir_node *sb;
+ current_ir_graph = get_irp_irg(i);
+
+ /* Test start block: if inner procedure end and end block are not
+ * visible and therefore not marked. */
+ sb = get_irg_start_block(current_ir_graph);
+ if (get_irn_visited(sb) < get_irg_visited(current_ir_graph)) {
+ cg_walk_2(sb, pre, post, env);
+ }
+ }
+
+ /* Walk all endless loops in inner procedures.
+ * We recognize an inner procedure if the End node is not visited. */
+ for (i = 0; i < get_irp_n_irgs(); i++) {
+ ir_node *e;
+ current_ir_graph = get_irp_irg(i);
+ e = get_irg_end(current_ir_graph);
+ if (get_irn_visited(e) < get_irg_visited(current_ir_graph)) {
+ int j;
+ /* Don't visit the End node. */
+ for (j = 0; j < get_End_n_keepalives(e); j++)
+ cg_walk_2(get_End_keepalive(e, j), pre, post, env);
+ }
+ }
+
+ set_interprocedural_view(rem_view);
+ current_ir_graph = rem;
+}
+
+
/***************************************************************************/
/* Walks back from n until it finds a real cf op. */
-ir_node *get_cf_op(ir_node *n) {
+static ir_node *get_cf_op(ir_node *n) {
ir_node *pred;
- n = skip_nop(n);
+ n = skip_Id(n);
n = skip_Tuple(n);
pred = skip_Proj(n);
if (!(is_cfop(pred) || is_fragile_op(pred) ||
- (get_irn_op(pred) == op_Bad)))
+ (get_irn_op(pred) == op_Bad)))
n = get_cf_op(n);
return skip_Proj(n);
}
-void irg_block_walk_2(ir_node *node, void (pre)(ir_node*, void*),
- void (post)(ir_node*, void*), void *env)
+static void irg_block_walk_2(ir_node *node, irg_walk_func *pre, irg_walk_func *post, void *env)
{
int i;
- assert(get_irn_opcode(node) == iro_Block);
+ if (Block_not_block_visited(node)) {
+ mark_Block_block_visited(node);
- 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));
-
- if(pre)
- pre(node, env);
+ 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));
- /* 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);
+ pred = get_nodes_block(pred);
if(get_irn_opcode(pred) == iro_Block) {
- /* recursion */
- irg_block_walk_2(pred, pre, post, env);
+ /* recursion */
+ irg_block_walk_2(pred, pre, post, env);
}
else {
- assert(get_irn_opcode(pred) == iro_Bad);
+ assert(get_irn_opcode(pred) == iro_Bad);
}
}
- if(post)
- post(node, env);
+ if(post) post(node, env);
}
return;
}
/* 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)
+void irg_block_walk(ir_node *node, irg_walk_func *pre, irg_walk_func *post, void *env)
{
+ ir_node *block, *pred;
+ int i;
+
+ hook_irg_block_walk(current_ir_graph, node, (generic_func *)pre, (generic_func *)post);
+
assert(node);
+ assert(!get_interprocedural_view()); /* interprocedural_view not implemented, because it
+ * interleaves with irg_walk */
inc_irg_block_visited(current_ir_graph);
- if (is_no_Block(node)) node = get_nodes_Block(node);
- assert(get_irn_opcode(node) == iro_Block);
- irg_block_walk_2(node, pre, post, env);
+ if (is_no_Block(node)) block = get_nodes_block(node); else block = node;
+ assert(get_irn_op(block) == op_Block);
+ irg_block_walk_2(block, pre, post, env);
+
+ /* keepalive: the endless loops ... */
+ if (get_irn_op(node) == op_End) {
+ int arity = get_irn_arity(node);
+ for (i = 0; i < arity; i++) {
+ pred = get_irn_n(node, i);
+ if (get_irn_op(pred) == op_Block)
+ irg_block_walk_2(pred, pre, post, env);
+ }
+ /* Sometimes the blocks died, but are still reachable through Phis.
+ * Make sure the algorithms that try to remove these reach them. */
+ for (i = 0; i < arity; i++) {
+ pred = get_irn_n(node, i);
+ if (get_irn_op(pred) == op_Phi) {
+ ir_node *block = get_nodes_block(pred);
+
+ if (! is_Bad(block))
+ irg_block_walk_2(block, pre, post, env);
+ }
+ }
+ }
+
return;
}
+
+/*
+ * 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;
+}
+
+/********************************************************************/
+
+typedef struct walk_env {
+ irg_walk_func *pre;
+ irg_walk_func *post;
+ void *env;
+} walk_env;
+
+/**
+ * Walk to all constant expressions in this entity.
+ */
+static void walk_entity(entity *ent, void *env)
+{
+ walk_env *my_env = (walk_env *)env;
+
+ if (get_entity_variability(ent) != variability_uninitialized) {
+ if (is_atomic_entity(ent)) {
+ irg_walk(get_atomic_ent_value(ent), my_env->pre, my_env->post, my_env->env);
+ }
+ else {
+ int 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) {
+ int i, j;
+ walk_env my_env;
+
+ 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. */
+ walk_types_entities(get_glob_type(), &walk_entity, &my_env);
+ for (i = 0; i < get_irp_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 < get_irp_n_types(); i++) {
+ ir_type *tp = get_irp_type(i);
+ if (is_Array_type(tp)) {
+ for (j = 0; j < get_array_n_dimensions(tp); 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