gcc/params.c

   1 /* params.c - Run-time parameters.
   2    Copyright (C) 2001, 2003, 2004, 2005 Free Software Foundation, Inc.
   3    Written by Mark Mitchell <mark@codesourcery.com>.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 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 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  20 02110-1301, USA.
  21
  22 */
  23
  24 #include "config.h"
  25 #include "system.h"
  26 #include "coretypes.h"
  27 #include "tm.h"
  28 #include "params.h"
  29 #include "toplev.h"
  30
  31 /* An array containing the compiler parameters and their current
  32    values.  */
  33
  34 param_info *compiler_params;
  35
  36 /* The number of entries in the table.  */
  37
  38 static size_t num_compiler_params;
  39
  40 /* Add the N PARAMS to the current list of compiler parameters.  */
  41
  42 void
  43 add_params (const param_info params[], size_t n)
  44 {
  45   /* Allocate enough space for the new parameters.  */
  46   compiler_params = xrealloc (compiler_params,
  47                               (num_compiler_params + n) * sizeof (param_info));
  48   /* Copy them into the table.  */
  49   memcpy (compiler_params + num_compiler_params,
  50           params,
  51           n * sizeof (param_info));
  52   /* Keep track of how many parameters we have.  */
  53   num_compiler_params += n;
  54 }
  55
  56 /* Set the VALUE associated with the parameter given by NAME.  */
  57
  58 void
  59 set_param_value (const char *name, int value)
  60 {
  61   size_t i;
  62
  63   /* Make sure nobody tries to set a parameter to an invalid value.  */
  64   gcc_assert (value != INVALID_PARAM_VAL);
  65
  66   /* Scan the parameter table to find a matching entry.  */
  67   for (i = 0; i < num_compiler_params; ++i)
  68     if (strcmp (compiler_params[i].option, name) == 0)
  69       {
  70         if (value < compiler_params[i].min_value)
  71           error ("minimum value of parameter %qs is %u",
  72                  compiler_params[i].option,
  73                  compiler_params[i].min_value);
  74         else if (compiler_params[i].max_value > compiler_params[i].min_value
  75                  && value > compiler_params[i].max_value)
  76           error ("maximum value of parameter %qs is %u",
  77                  compiler_params[i].option,
  78                  compiler_params[i].max_value);
  79         else
  80           {
  81             compiler_params[i].value = value;
  82             compiler_params[i].set = true;
  83           }
  84         return;
  85       }
  86
  87   /* If we didn't find this parameter, issue an error message.  */
  88   error ("invalid parameter %qs", name);
  89 }