2 * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief restarting SSA construction for values.
23 * @author Michael Beck
28 #include "irgraph_t.h"
32 /** Note: start and finish must use the same kind of walker */
33 static void (*ssa_cons_walker)(ir_graph *, irg_walk_func *, irg_walk_func *, void *)
34 = irg_block_walk_graph;
37 * Post-walker: prepare the graph nodes for new SSA construction cycle by
38 * allocation new arrays.
40 static void prepare_blocks(ir_node *block, void *env)
42 unsigned n_loc = current_ir_graph->n_loc;
43 struct obstack *obst = current_ir_graph->obst;
45 /* reset mature flag */
46 set_Block_matured(block, 0);
47 block->attr.block.graph_arr = NEW_ARR_D(ir_node *, obst, n_loc);
48 memset(block->attr.block.graph_arr, 0, sizeof(ir_node*) * n_loc);
49 set_Block_phis(block, NULL);
52 void ssa_cons_start(ir_graph *irg, int n_loc)
54 add_irg_constraints(irg, IR_GRAPH_CONSTRAINT_CONSTRUCTION);
56 irg_set_nloc(irg, n_loc);
59 * Note: we could try to reuse existing frag arrays, but it does not
60 * seems worth to do this. First, we have to check if they really exists and
61 * then clear them. We do not expect SSA construction is used often.
63 ssa_cons_walker(irg, NULL, prepare_blocks, NULL);
67 * mature all immature Blocks.
69 static void finish_block(ir_node *block, void *env)
73 mature_immBlock(block);
76 void ssa_cons_finish(ir_graph *irg)
78 ssa_cons_walker(irg, NULL, finish_block, NULL);
79 irg_finalize_cons(irg);