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  * @version $Id$
  26  */
  27 #include "config.h"
  28
  29 #include "irgraph_t.h"
  30 #include "iredges.h"
  31 #include "error.h"
  32 #include "ircons.h"
  33 #include "instrument.h"
  34
  35 /**
  36  * Adds a Call at the beginning of the given irg.
  37  */
  38 void instrument_initcall(ir_graph *irg, ir_entity *ent)
  39 {
  40         const ir_edge_t *edge;
  41         ir_node         *initial_exec;
  42         ir_node         *initial_mem;
  43         ir_node         *start_block;
  44         ir_node         *adr, *call, *new_mem;
  45         ir_node         *first_block = NULL;
  46         int             i, idx, need_new_block;
  47         symconst_symbol sym;
  48
  49         edges_assure(irg);
  50
  51         /* find the first block */
  52         initial_exec = get_irg_initial_exec(irg);
  53         start_block  = get_irg_start_block(irg);
  54
  55         foreach_out_edge(initial_exec, edge) {
  56                 ir_node *succ = get_edge_src_irn(edge);
  57
  58                 if (succ != start_block && is_Block(succ)) {
  59                         /* found the first block */
  60                         first_block = succ;
  61                         break;
  62                 }
  63         }
  64         if (first_block == NULL) {
  65                 panic("Cannot find first block of irg %+F", irg);
  66         }
  67
  68         /* check if this block has only one predecessor */
  69         idx = -1;
  70         need_new_block = 0;
  71         for (i = get_Block_n_cfgpreds(first_block) - 1; i >= 0; --i) {
  72                 ir_node *p = get_Block_cfgpred(first_block, i);
  73
  74                 if (is_Bad(p))
  75                         continue;
  76                 if (p == initial_exec)
  77                         idx = i;
  78                 else
  79                         need_new_block = 1;
  80         }
  81
  82         if (need_new_block) {
  83                 ir_node *blk = new_r_Block(irg, 1, &initial_exec);
  84                 set_Block_cfgpred(first_block, idx, new_r_Jmp(blk));
  85                 first_block = blk;
  86         }
  87
  88         /* place the call */
  89         sym.entity_p = ent;
  90         adr = new_r_SymConst(irg, mode_P_code, sym, symconst_addr_ent);
  91
  92         call    = new_r_Call(first_block, get_irg_no_mem(irg), adr, 0, NULL, get_entity_type(ent));
  93         new_mem = new_r_Proj(call, mode_M, pn_Call_M);
  94
  95         initial_mem = get_irg_initial_mem(irg);
  96         edges_reroute(initial_mem, new_mem);
  97         /* beware: reroute routes anchor edges also, revert this */
  98         set_irg_initial_mem(irg, initial_mem);
  99         set_Call_mem(call, initial_mem);
 100 }