osprey/be/cg/label_util.cxx

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/*
 * Copyright 2002, 2003, 2004, 2005, 2006 PathScale, Inc.  All Rights Reserved.
 */

/*

  Copyright (C) 2000, 2001 Silicon Graphics, Inc.  All Rights Reserved.

  This program is free software; you can redistribute it and/or modify it
  under the terms of version 2 of the GNU General Public License as
  published by the Free Software Foundation.

  This program is distributed in the hope that it would be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  

  Further, this software is distributed without any warranty that it is
  free of the rightful claim of any third person regarding infringement 
  or the like.  Any license provided herein, whether implied or 
  otherwise, applies only to this software file.  Patent licenses, if 
  any, provided herein do not apply to combinations of this program with 
  other software, or any other product whatsoever.  

  You should have received a copy of the GNU General Public License along
  with this program; if not, write the Free Software Foundation, Inc., 59
  Temple Place - Suite 330, Boston MA 02111-1307, USA.

  Contact information:  Silicon Graphics, Inc., 1600 Amphitheatre Pky,
  Mountain View, CA 94043, or:

  http://www.sgi.com

  For further information regarding this notice, see:

  http://oss.sgi.com/projects/GenInfo/NoticeExplan

*/


// Label Utilities

#include <alloca.h>
#include "defs.h"
#include "mempool.h"
#include "config_asm.h"
#include "label_util.h"
#include "be_util.h"
#include "bb.h"

// Map LABEL number to offset and defining BB.
typedef struct {
  mUINT64 offset;
  BB *def_bb;
} label_info;
static label_info *label_info_array;
static INT max_label_info_index = 0;

static void
Realloc_Label_Info (INT min_needed)
{
    if (min_needed >= max_label_info_index) {
  // realloc space
  INT size = MAX(max_label_info_index * 2, min_needed + 8);
  label_info_array =
      TYPE_MEM_POOL_REALLOC_N (label_info, &MEM_src_pool,
             label_info_array,
             max_label_info_index, size);
  max_label_info_index = size;
    }
}

// initialize label_info_array
void
Init_Label_Info (void)
{
  INT last_label_in_PU = LABEL_Table_Size(CURRENT_SYMTAB);
  if (label_info_array == NULL) {
    max_label_info_index = MAX(8,last_label_in_PU);
    label_info_array = (label_info*) Src_Alloc (
      sizeof(label_info) * max_label_info_index);
  }
  else {
    // clear out the values
    INT i;
    for (i = 0; i < max_label_info_index; i++) {
      label_info_array[i].offset = 0;
      label_info_array[i].def_bb = NULL;
    }
    Realloc_Label_Info (last_label_in_PU);
  }
}

// Get the label pc offset for a given label number
UINT64
Get_Label_Offset (LABEL_IDX i)
{
  if (i >= max_label_info_index) {
  // overflowed
  Realloc_Label_Info (i);
  }
  Is_True(i < max_label_info_index, ("Get_Label_Offset still overflows?"));
  return label_info_array[i].offset;
}

void
Set_Label_Offset (LABEL_IDX i, UINT64 offset)
{
  if (i >= max_label_info_index) {
  // overflowed
  Realloc_Label_Info (i);
  }
  Is_True(i < max_label_info_index, ("Set_Label_Offset still overflows?"));
  label_info_array[i].offset = offset;
}

// Get the defining BB for a given label number
BB*
Get_Label_BB (LABEL_IDX i)
{
  if (i >= max_label_info_index) {
  // overflowed
  Realloc_Label_Info (i);
  }
  Is_True(i < max_label_info_index, ("Get_Label_BB still overflows?"));
  return label_info_array[i].def_bb;
}

void
Set_Label_BB (LABEL_IDX i, BB *bb)
{
  if (i >= max_label_info_index) {
  // overflowed
  Realloc_Label_Info (i);
  }
  Is_True(i < max_label_info_index, ("Set_Label_BB still overflows?"));
  label_info_array[i].def_bb = bb;
}

LABEL_IDX Gen_Temp_Label(void)
{
  enum { maxint_digits = 10 };
  char *name;
  LABEL_IDX labx;
  LABEL &label = New_LABEL(CURRENT_SYMTAB, labx);

  name = (char *)alloca(  strlen(LABEL_PREFIX "__")
                        + maxint_digits
                        + maxint_digits
                        + 1);
  // use underscores cause intel's asm doesn't like dots in name
  sprintf(name, LABEL_PREFIX "_%d_%d", Current_PU_Count(), labx);
  LABEL_Init (label, Save_Str(name), LKIND_DEFAULT);

  return labx;
}

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