gcc/params.c

   1 /* params.c - Run-time parameters.
   2    Copyright (C) 2001, 2003, 2004, 2005, 2007, 2008
   3    Free Software Foundation, Inc.
   4    Written by Mark Mitchell <mark@codesourcery.com>.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tm.h"
  26 #include "params.h"
  27 #include "toplev.h"
  28
  29 /* An array containing the compiler parameters and their current
  30    values.  */
  31
  32 param_info *compiler_params;
  33
  34 /* The number of entries in the table.  */
  35 static size_t num_compiler_params;
  36
  37 /* Add the N PARAMS to the current list of compiler parameters.  */
  38
  39 void
  40 add_params (const param_info params[], size_t n)
  41 {
  42   /* Allocate enough space for the new parameters.  */
  43   compiler_params = XRESIZEVEC (param_info, compiler_params,
  44                                 num_compiler_params + n);
  45   /* Copy them into the table.  */
  46   memcpy (compiler_params + num_compiler_params,
  47           params,
  48           n * sizeof (param_info));
  49   /* Keep track of how many parameters we have.  */
  50   num_compiler_params += n;
  51 }
  52
  53 /* Set the VALUE associated with the parameter given by NAME.  */
  54
  55 void
  56 set_param_value (const char *name, int value)
  57 {
  58   size_t i;
  59
  60   /* Make sure nobody tries to set a parameter to an invalid value.  */
  61   gcc_assert (value != INVALID_PARAM_VAL);
  62
  63   /* Scan the parameter table to find a matching entry.  */
  64   for (i = 0; i < num_compiler_params; ++i)
  65     if (strcmp (compiler_params[i].option, name) == 0)
  66       {
  67         if (value < compiler_params[i].min_value)
  68           error ("minimum value of parameter %qs is %u",
  69                  compiler_params[i].option,
  70                  compiler_params[i].min_value);
  71         else if (compiler_params[i].max_value > compiler_params[i].min_value
  72                  && value > compiler_params[i].max_value)
  73           error ("maximum value of parameter %qs is %u",
  74                  compiler_params[i].option,
  75                  compiler_params[i].max_value);
  76         else
  77           {
  78             compiler_params[i].value = value;
  79             compiler_params[i].set = true;
  80           }
  81         return;
  82       }
  83
  84   /* If we didn't find this parameter, issue an error message.  */
  85   error ("invalid parameter %qs", name);
  86 }
  87
  88 /* Return the current value of num_compiler_params, for the benefit of
  89    plugins that use parameters as features.  */
  90
  91 size_t
  92 get_num_compiler_params (void)
  93 {
  94   return num_compiler_params;
  95 }