nsz Git - libfirm/blob - ir/ir/instrument.c

   1 /*
   2  * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
   3  *
   4  * This file is part of libFirm.
   5  *
   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.
  10  *
  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.
  14  *
  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
  17  * PURPOSE.
  18  */
  19
  20 /**
  21  * @file
  22  * @brief   Instrumentation of graphs.
  23  * @date    14.4.2008
  24  * @author  Michael Beck
  25  */
  26 #include "config.h"
  27
  28 #include "irgraph_t.h"
  29 #include "iredges.h"
  30 #include "error.h"
  31 #include "ircons.h"
  32 #include "instrument.h"
  33
  34 void instrument_initcall(ir_graph *irg, ir_entity *ent)
  35 {
  36         const ir_edge_t *edge;
  37         ir_node         *initial_exec;
  38         ir_node         *initial_mem;
  39         ir_node         *start_block;
  40         ir_node         *adr, *call, *new_mem;
  41         ir_node         *first_block = NULL;
  42         int             i, idx, need_new_block;
  43         symconst_symbol sym;
  44
  45         assure_edges(irg);
  46
  47         /* find the first block */
  48         initial_exec = get_irg_initial_exec(irg);
  49         start_block  = get_irg_start_block(irg);
  50
  51         foreach_out_edge(initial_exec, edge) {
  52                 ir_node *succ = get_edge_src_irn(edge);
  53
  54                 if (succ != start_block && is_Block(succ)) {
  55                         /* found the first block */
  56                         first_block = succ;
  57                         break;
  58                 }
  59         }
  60         if (first_block == NULL) {
  61                 panic("Cannot find first block of irg %+F", irg);
  62         }
  63
  64         /* check if this block has only one predecessor */
  65         idx = -1;
  66         need_new_block = 0;
  67         for (i = get_Block_n_cfgpreds(first_block) - 1; i >= 0; --i) {
  68                 ir_node *p = get_Block_cfgpred(first_block, i);
  69
  70                 if (is_Bad(p))
  71                         continue;
  72                 if (p == initial_exec)
  73                         idx = i;
  74                 else
  75                         need_new_block = 1;
  76         }
  77
  78         if (need_new_block) {
  79                 ir_node *blk = new_r_Block(irg, 1, &initial_exec);
  80                 set_Block_cfgpred(first_block, idx, new_r_Jmp(blk));
  81                 first_block = blk;
  82         }
  83
  84         /* place the call */
  85         sym.entity_p = ent;
  86         adr = new_r_SymConst(irg, mode_P_code, sym, symconst_addr_ent);
  87
  88         call    = new_r_Call(first_block, get_irg_no_mem(irg), adr, 0, NULL, get_entity_type(ent));
  89         new_mem = new_r_Proj(call, mode_M, pn_Call_M);
  90
  91         initial_mem = get_irg_initial_mem(irg);
  92         edges_reroute(initial_mem, new_mem);
  93         /* beware: reroute routes anchor edges also, revert this */
  94         set_irg_initial_mem(irg, initial_mem);
  95         set_Call_mem(call, initial_mem);
  96 }