+/*
+ * Copyright (C) 1995-2008 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.
+ */
-/* Copyright (C) 1998 - 2000 by Universitaet Karlsruhe
-** All rights reserved.
-**
-** Authors: Martin Trapp, Christian Schaefer
-**
-** irgmod: ir graph modification
-*/
-
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-# include "irnode_t.h"
-# include "irgraph_t.h"
-# include "irgmod.h"
-# include "array.h"
-
-/* Turns a node into a "useless" Tuple. The Tuple just forms a tuple
- from several inputs.
- This is useful if a node returning a tuple is removed, but the Projs
- extracting values from the tuple are not available. */
-void
-turn_into_tuple (ir_node *node, int arity)
-{
- assert(node);
- set_irn_op(node, op_Tuple);
- if (get_irn_arity(node) == arity) {
- /* keep old array */
- } else {
- /* Allocate new array, don't free old in_array, it's on the obstack. */
- ir_node *block = get_nodes_Block(node);
- node->in = NEW_ARR_D (ir_node *, current_ir_graph->obst, arity+1);
- set_nodes_Block(node, block);
- }
-}
-
-/* Insert irnode `new' in place of irnode `old'
- Since `new' may be bigger than `old' replace `old'
- by an op_Id which is smaller than everything */
-inline void
-exchange (ir_node *old, ir_node *new)
-{
- ir_node *block = old->in[0];
-
- old->op = op_Id;
- old->in = NEW_ARR_D (ir_node *, current_ir_graph->obst, 2);
- old->in[0] = block;
- old->in[1] = new;
+/**
+ * @file
+ * @brief Support for ir graph modification.
+ * @author Martin Trapp, Christian Schaefer, Goetz Lindenmaier
+ */
+#include "config.h"
+
+#include "irflag_t.h"
+#include "irgwalk.h"
+#include "irnode_t.h"
+#include "irgraph_t.h"
+#include "irgmod.h"
+#include "array.h"
+#include "ircons.h"
+#include "irhooks.h"
+#include "iredges_t.h"
+#include "irtools.h"
+#include "error.h"
+
+void turn_into_tuple(ir_node *const node, int const arity, ir_node *const *const in)
+{
+ set_irn_in(node, arity, in);
+ set_irn_op(node, op_Tuple);
+}
+
+void exchange(ir_node *old, ir_node *nw)
+{
+ ir_graph *irg;
+
+ assert(old && nw);
+ assert(old != nw && "Exchanging node with itself is not allowed");
+
+ irg = get_irn_irg(old);
+ assert(irg == get_irn_irg(nw) && "New node must be in same irg as old node");
+
+ hook_replace(old, nw);
+
+ /*
+ * If new outs are on, we can skip the id node creation and reroute
+ * the edges from the old node to the new directly.
+ */
+ if (edges_activated(irg)) {
+ /* copy all dependencies from old to new */
+ add_irn_deps(nw, old);
+
+ edges_reroute(old, nw);
+ edges_reroute_kind(old, nw, EDGE_KIND_DEP);
+ edges_node_deleted(old);
+ /* noone is allowed to reference this node anymore */
+ set_irn_op(old, op_Deleted);
+ } else {
+ /* Else, do it the old-fashioned way. */
+ ir_node *block;
+
+ hook_turn_into_id(old);
+
+ block = old->in[0];
+ if (! block) {
+ block = is_Block(nw) ? nw : get_nodes_block(nw);
+
+ if (! block) {
+ panic("cannot find legal block for id");
+ }
+ }
+
+ if (get_irn_op(old)->opar == oparity_dynamic) {
+ DEL_ARR_F(get_irn_in(old));
+ }
+
+ old->op = op_Id;
+ old->in = NEW_ARR_D(ir_node*, get_irg_obstack(irg), 2);
+ old->in[0] = block;
+ old->in[1] = nw;
+ }
+
+ /* update irg flags */
+ clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUTS
+ | IR_GRAPH_PROPERTY_CONSISTENT_LOOPINFO);
+}
+
+/**
+ * Walker: links all Phi nodes to their Blocks lists,
+ * all Proj nodes to there predecessors.
+ */
+static void collect_phiprojs_walker(ir_node *n, void *env)
+{
+ ir_node *pred;
+ (void) env;
+
+ if (is_Phi(n)) {
+ ir_node *block = get_nodes_block(n);
+ add_Block_phi(block, n);
+ } else if (is_Proj(n)) {
+ pred = n;
+ do {
+ pred = get_Proj_pred(pred);
+ } while (is_Proj(pred));
+
+ set_irn_link(n, get_irn_link(pred));
+ set_irn_link(pred, n);
+ }
+}
+
+void collect_phiprojs(ir_graph *irg)
+{
+ assert((ir_resources_reserved(irg) & (IR_RESOURCE_IRN_LINK|IR_RESOURCE_PHI_LIST)) ==
+ (IR_RESOURCE_IRN_LINK|IR_RESOURCE_PHI_LIST));
+ irg_walk_graph(irg, firm_clear_node_and_phi_links, collect_phiprojs_walker, NULL);
+}
+
+/**
+ * Moves node and all predecessors of node from from_bl to to_bl.
+ * Does not move predecessors of Phi nodes (or block nodes).
+ */
+static void move(ir_node *node, ir_node *from_bl, ir_node *to_bl)
+{
+ int i, arity;
+
+ /* move this node */
+ set_nodes_block(node, to_bl);
+
+ /* move its Projs */
+ if (get_irn_mode(node) == mode_T) {
+ ir_node *proj = (ir_node*)get_irn_link(node);
+ while (proj) {
+ if (get_nodes_block(proj) == from_bl)
+ set_nodes_block(proj, to_bl);
+ proj = (ir_node*)get_irn_link(proj);
+ }
+ }
+
+ if (is_Phi(node))
+ return;
+
+ /* recursion ... */
+ arity = get_irn_arity(node);
+ for (i = 0; i < arity; i++) {
+ ir_node *pred = get_irn_n(node, i);
+ if (get_nodes_block(pred) == from_bl)
+ move(pred, from_bl, to_bl);
+ }
+}
+
+static void move_projs(const ir_node *node, ir_node *to_bl)
+{
+ if (get_irn_mode(node) != mode_T)
+ return;
+
+ foreach_out_edge(node, edge) {
+ ir_node *proj = get_edge_src_irn(edge);
+ if (!is_Proj(proj))
+ continue;
+ set_nodes_block(proj, to_bl);
+ move_projs(proj, to_bl);
+ }
+}
+
+/**
+ * Moves node and all predecessors of node from from_bl to to_bl.
+ * Does not move predecessors of Phi nodes (or block nodes).
+ */
+static void move_edges(ir_node *node, ir_node *from_bl, ir_node *to_bl)
+{
+ int i, arity;
+
+ /* move this node */
+ set_nodes_block(node, to_bl);
+
+ /* move its Projs */
+ move_projs(node, to_bl);
+
+ /* We must not move predecessors of Phi nodes, even if they are in
+ * from_bl. (because these are values from an earlier loop iteration
+ * which are not predecessors of node here)
+ */
+ if (is_Phi(node))
+ return;
+
+ /* recursion ... */
+ arity = get_irn_arity(node);
+ for (i = 0; i < arity; i++) {
+ ir_node *pred = get_irn_n(node, i);
+ if (get_nodes_block(pred) == from_bl)
+ move_edges(pred, from_bl, to_bl);
+ }
+}
+
+void part_block(ir_node *node)
+{
+ ir_graph *irg = get_irn_irg(node);
+ ir_node *new_block, *old_block;
+ ir_node *phi, *jmp;
+
+ /* Turn off optimizations so that blocks are not merged again. */
+ int rem_opt = get_opt_optimize();
+ set_optimize(0);
+
+ /* Transform the control flow */
+ old_block = get_nodes_block(node);
+ new_block = new_r_Block(irg, get_Block_n_cfgpreds(old_block),
+ get_Block_cfgpred_arr(old_block));
+
+ /* create a jump from new_block to old_block, which is now the lower one */
+ jmp = new_r_Jmp(new_block);
+ set_irn_in(old_block, 1, &jmp);
+
+ /* move node and its predecessors to new_block */
+ move(node, old_block, new_block);
+
+ /* move Phi nodes to new_block */
+ phi = get_Block_phis(old_block);
+ set_Block_phis(new_block, phi);
+ set_Block_phis(old_block, NULL);
+ while (phi) {
+ set_nodes_block(phi, new_block);
+ phi = get_Phi_next(phi);
+ }
+
+ set_optimize(rem_opt);
+}
+
+ir_node *part_block_edges(ir_node *node)
+{
+ ir_graph *irg = get_irn_irg(node);
+ ir_node *old_block = get_nodes_block(node);
+ ir_node *new_block = new_r_Block(irg, get_Block_n_cfgpreds(old_block), get_Block_cfgpred_arr(old_block));
+
+ /* old_block has no predecessors anymore for now */
+ set_irn_in(old_block, 0, NULL);
+
+ /* move node and its predecessors to new_block */
+ move_edges(node, old_block, new_block);
+
+ /* move Phi nodes to new_block */
+ foreach_out_edge_safe(old_block, edge) {
+ ir_node *phi = get_edge_src_irn(edge);
+ if (!is_Phi(phi))
+ continue;
+ set_nodes_block(phi, new_block);
+ }
+
+ return old_block;
+}
+
+void kill_node(ir_node *node)
+{
+ ir_graph *irg = get_irn_irg(node);
+
+ if (edges_activated(irg)) {
+ edges_node_deleted(node);
+ }
+ /* noone is allowed to reference this node anymore */
+ set_irn_op(node, op_Deleted);
}
projects / libfirm / blobdiff