+ 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);
+
+ 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_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);
+ }
+
+ post(node, env);
+
+ return cnt;
+}
+
+/**
+ * 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;
+
+ 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_core(ir_node *node, irg_walk_func *pre, irg_walk_func *post,
+ void *env)
+{
+ 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(irg_walk_func *pre, irg_walk_func *post, void *env)
+{
+ size_t i, n;
+ ir_graph *irg;
+
+ for (i = 0, n = get_irp_n_irgs(); i < n; i++) {
+ irg = get_irp_irg(i);
+ irg_walk_graph(irg, pre, post, env);
+ }
+}
+
+/***************************************************************************/
+
+/**
+ * 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);
+ }