3 * File name: ir/ir/irgmod.c
4 * Purpose: Support for ir graph modification.
5 * Author: Martin Trapp, Christian Schaefer
6 * Modified by: Goetz Lindenmaier
9 * Copyright: (c) 1998-2003 Universität Karlsruhe
10 * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
21 #include "irgraph_t.h"
26 #include "iredges_t.h"
29 /* Turns a node into a "useless" Tuple. The Tuple just forms a tuple
31 This is useful if a node returning a tuple is removed, but the Projs
32 extracting values from the tuple are not available. */
34 turn_into_tuple (ir_node *node, int arity)
37 set_irn_op(node, op_Tuple);
38 if (get_irn_arity(node) == arity) {
41 /* Allocate new array, don't free old in_array, it's on the obstack. */
42 ir_node *block = get_nodes_block(node);
43 node->in = NEW_ARR_D (ir_node *, current_ir_graph->obst, arity+1);
44 edges_invalidate(node, current_ir_graph);
45 set_nodes_block(node, block);
49 /* Insert irnode `new' in place of irnode `old'
50 Since `new' may be bigger than `old' replace `old'
51 by an op_Id which is smaller than everything */
53 exchange (ir_node *old, ir_node *nw)
56 * If new outs are on, we can skip the id node creation and reroute
57 * the edges from the old node to the new directly.
59 if (edges_activated(current_ir_graph)) {
60 edges_reroute(old, nw, current_ir_graph);
63 /* Else, do it the old-fashioned way. */
65 ir_graph *irg = get_irn_irg (old);
70 assert(get_irn_op(old)->opar != oparity_dynamic);
72 hook_turn_into_id(old);
76 block = is_Block(nw) ? nw : get_nodes_block(nw);
81 assert(0 && "cannot find legal block for id");
86 old->in = NEW_ARR_D (ir_node *, irg->obst, 2);
92 /*--------------------------------------------------------------------*/
93 /* Functionality for collect_phis */
94 /*--------------------------------------------------------------------*/
97 collect (ir_node *n, void *env) {
99 if (get_irn_op(n) == op_Phi) {
100 set_irn_link(n, get_irn_link(get_nodes_block(n)));
101 set_irn_link(get_nodes_block(n), n);
103 if (get_irn_op(n) == op_Proj) {
105 while (get_irn_op(pred) == op_Proj)
106 pred = get_Proj_pred(pred);
107 set_irn_link(n, get_irn_link(pred));
108 set_irn_link(pred, n);
112 void collect_phiprojs(ir_graph *irg) {
115 /* Remember external state of current_ir_graph. */
116 rem = current_ir_graph;
117 current_ir_graph = irg;
119 irg_walk(get_irg_end(current_ir_graph), firm_clear_link, collect, NULL);
121 current_ir_graph = rem;
125 /*--------------------------------------------------------------------*/
126 /* Functionality for part_block */
127 /*--------------------------------------------------------------------*/
130 * Moves node and all predecessors of node from from_bl to to_bl.
131 * Does not move predecessors of Phi nodes (or block nodes).
133 static void move (ir_node *node, ir_node *from_bl, ir_node *to_bl) {
135 ir_node *proj, *pred;
138 set_nodes_block(node, to_bl);
141 if (get_irn_mode(node) == mode_T) {
142 proj = get_irn_link(node);
144 if (get_nodes_block(proj) == from_bl)
145 set_nodes_block(proj, to_bl);
146 proj = get_irn_link(proj);
151 if (get_irn_op(node) == op_Phi) return;
153 arity = get_irn_arity(node);
154 for (i = 0; i < arity; i++) {
155 pred = get_irn_n(node, i);
156 if (get_nodes_block(pred) == from_bl)
157 move(pred, from_bl, to_bl);
161 void part_block(ir_node *node) {
166 /* Turn off optimizations so that blocks are not merged again. */
167 int rem_opt = get_opt_optimize();
170 /* Transform the control flow */
171 old_block = get_nodes_block(node);
172 new_block = new_Block(get_Block_n_cfgpreds(old_block),
173 get_Block_cfgpred_arr(old_block));
174 set_irg_current_block(current_ir_graph, new_block);
178 set_irn_in(old_block, 1, in);
179 irn_vrfy_irg(old_block, current_ir_graph);
182 /* move node and its predecessors to new_block */
183 move(node, old_block, new_block);
185 /* move Phi nodes to new_block */
186 phi = get_irn_link(old_block);
187 set_irn_link(new_block, phi);
188 set_irn_link(old_block, NULL);
190 if(get_nodes_block(phi) == old_block); /* @@@ inlinening chokes on phis that don't
191 obey this condition. How do they get into
192 the list??? Example: InterfaceIII */
193 set_nodes_block(phi, new_block);
194 phi = get_irn_link(phi);
197 set_optimize(rem_opt);