gcc/varray.c

   1 /* Virtual array support.
   2    Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
   3    Contributed by Cygnus Solutions.
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2, or (at your option)
  10    any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GCC; see the file COPYING.  If not, write to the Free
  19    the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  20    MA 02111-1307, USA.  */
  21
  22 #include "config.h"
  23 #include "errors.h"
  24 #include "system.h"
  25 #include "rtl.h"
  26 #include "tree.h"
  27 #include "bitmap.h"
  28 #include "varray.h"
  29
  30 #define VARRAY_HDR_SIZE (sizeof (struct varray_head_tag) - sizeof (varray_data))
  31
  32 /* Allocate a virtual array with NUM_ELEMENT elements, each of which is
  33    ELEMENT_SIZE bytes long, named NAME.  Array elements are zeroed.  */
  34 varray_type
  35 varray_init (num_elements, element_size, name)
  36      size_t num_elements;
  37      size_t element_size;
  38      const char *name;
  39 {
  40   size_t data_size = num_elements * element_size;
  41   varray_type ptr = (varray_type) xcalloc (VARRAY_HDR_SIZE + data_size, 1);
  42
  43   ptr->num_elements = num_elements;
  44   ptr->elements_used = 0;
  45   ptr->element_size = element_size;
  46   ptr->name = name;
  47   return ptr;
  48 }
  49
  50 /* Grow/shrink the virtual array VA to N elements.  Zero any new elements
  51    allocated.  */
  52 varray_type
  53 varray_grow (va, n)
  54      varray_type va;
  55      size_t n;
  56 {
  57   size_t old_elements = va->num_elements;
  58
  59   if (n != old_elements)
  60     {
  61       size_t element_size = va->element_size;
  62       size_t old_data_size = old_elements * element_size;
  63       size_t data_size = n * element_size;
  64
  65       va = (varray_type) xrealloc ((char *)va, VARRAY_HDR_SIZE + data_size);
  66       va->num_elements = n;
  67       if (n > old_elements)
  68         memset (&va->data.c[old_data_size], 0, data_size - old_data_size);
  69     }
  70
  71   return va;
  72 }
  73
  74 /* Check the bounds of a varray access.  */
  75
  76 #if defined ENABLE_CHECKING && (GCC_VERSION >= 2007)
  77
  78 extern void error PARAMS ((const char *, ...))  ATTRIBUTE_PRINTF_1;
  79
  80 void
  81 varray_check_failed (va, n, file, line, function)
  82      varray_type va;
  83      size_t n;
  84      const char *file;
  85      int line;
  86      const char *function;
  87 {
  88   internal_error ("Virtual array %s[%lu]: element %lu out of bounds in %s, at %s:%d",
  89                   va->name, (unsigned long) va->num_elements, (unsigned long) n,
  90                   function, trim_filename (file), line);
  91 }
  92
  93 #endif