callgrind/costs.c

   1 /*--------------------------------------------------------------------*/
   2 /*--- Callgrind                                                    ---*/
   3 /*---                                                   ct_costs.c ---*/
   4 /*--------------------------------------------------------------------*/
   5
   6 /*
   7    This file is part of Callgrind, a Valgrind tool for call tracing.
   8
   9    Copyright (C) 2002-2017, Josef Weidendorfer (Josef.Weidendorfer@gmx.de)
  10
  11    This program is free software; you can redistribute it and/or
  12    modify it under the terms of the GNU General Public License as
  13    published by the Free Software Foundation; either version 2 of the
  14    License, or (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful, but
  17    WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19    General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, see <http://www.gnu.org/licenses/>.
  23
  24    The GNU General Public License is contained in the file COPYING.
  25 */
  26
  27 #include "global.h"
  28
  29 #include "pub_tool_mallocfree.h"
  30
  31 #define COSTCHUNK_SIZE 100000
  32
  33 UInt CLG_(costarray_entries) = 0;
  34 UInt CLG_(costarray_chunks) = 0;
  35 static CostChunk* cost_chunk_base = 0;
  36 static CostChunk* cost_chunk_current = 0;
  37
  38 ULong* CLG_(get_costarray)(Int size)
  39 {
  40   ULong* ptr;
  41
  42   if (!cost_chunk_current ||
  43       (cost_chunk_current->size - cost_chunk_current->used < size)) {
  44     CostChunk* cc  = (CostChunk*) CLG_MALLOC("cl.costs.gc.1",
  45                                               sizeof(CostChunk) +
  46                                               COSTCHUNK_SIZE * sizeof(ULong));
  47     CLG_ASSERT(size < COSTCHUNK_SIZE);
  48
  49     cc->size = COSTCHUNK_SIZE;
  50     cc->used = 0;
  51     cc->next = 0;
  52
  53     if (cost_chunk_current)
  54       cost_chunk_current->next = cc;
  55     cost_chunk_current = cc;
  56
  57     if (!cost_chunk_base) cost_chunk_base = cc;
  58
  59     CLG_(costarray_chunks)++;
  60   }
  61
  62   ptr = &(cost_chunk_current->data[cost_chunk_current->used]);
  63   cost_chunk_current->used += size;
  64
  65   CLG_(costarray_entries) += size;
  66
  67   return ptr;
  68 }