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 Instrumentation of graphs.
24 * @author Michael Beck
31 #include "irgraph_t.h"
35 #include "instrument.h"
38 * Adds a Call at the beginning of the given irg.
40 void instrument_initcall(ir_graph *irg, ir_entity *ent) {
41 const ir_edge_t *edge;
42 ir_node *initial_exec;
45 ir_node *adr, *call, *new_mem;
46 ir_node *first_block = NULL;
47 int i, idx, need_new_block;
52 /* find the first block */
53 initial_exec = get_irg_initial_exec(irg);
54 start_block = get_irg_start_block(irg);
56 foreach_out_edge(initial_exec, edge) {
57 ir_node *succ = get_edge_src_irn(edge);
59 if (succ != start_block && is_Block(succ)) {
60 /* found the first block */
65 if (first_block == NULL) {
66 panic("Cannot find first block of irg %+F", irg);
69 /* check if this block has only one predecessor */
72 for (i = get_Block_n_cfgpreds(first_block) - 1; i >= 0; --i) {
73 ir_node *p = get_Block_cfgpred(first_block, i);
77 if (p == initial_exec)
84 ir_node *blk = new_r_Block(irg, 1, &initial_exec);
85 set_Block_cfgpred(first_block, idx, new_r_Jmp(irg, blk));
91 adr = new_r_SymConst(irg, start_block, mode_P_code, sym, symconst_addr_ent);
93 call = new_r_Call(irg, first_block, get_irg_no_mem(irg), adr, 0, NULL, get_entity_type(ent));
94 new_mem = new_r_Proj(irg, first_block, call, mode_M, pn_Call_M_regular);
96 initial_mem = get_irg_initial_mem(irg);
97 edges_reroute(initial_mem, new_mem, irg);
98 /* beware: reroute routes anchor edges also, revert this */
99 set_irg_initial_mem(irg, initial_mem);
100 set_Call_mem(call, initial_mem);