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/* params.c - Run-time parameters.
   Copyright (C) 2001, 2003, 2004, 2005, 2007, 2008
   Free Software Foundation, Inc.
   Written by Mark Mitchell <mark@codesourcery.com>.
 
This file is part of GCC.
 
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
 
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.
 
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */
 
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "params.h"
#include "toplev.h"
 
/* An array containing the compiler parameters and their current
   values.  */
 
param_info *compiler_params;
 
/* The number of entries in the table.  */
static size_t num_compiler_params;
 
/* Add the N PARAMS to the current list of compiler parameters.  */
 
void
add_params (const param_info params[], size_t n)
{
  /* Allocate enough space for the new parameters.  */
  compiler_params = XRESIZEVEC (param_info, compiler_params,
				num_compiler_params + n);
  /* Copy them into the table.  */
  memcpy (compiler_params + num_compiler_params,
	  params,
	  n * sizeof (param_info));
  /* Keep track of how many parameters we have.  */
  num_compiler_params += n;
}
 
/* Set the VALUE associated with the parameter given by NAME.  */
 
void
set_param_value (const char *name, int value)
{
  size_t i;
 
  /* Make sure nobody tries to set a parameter to an invalid value.  */
  gcc_assert (value != INVALID_PARAM_VAL);
 
  /* Scan the parameter table to find a matching entry.  */
  for (i = 0; i < num_compiler_params; ++i)
    if (strcmp (compiler_params[i].option, name) == 0)
      {
	if (value < compiler_params[i].min_value)
	  error ("minimum value of parameter %qs is %u",
		 compiler_params[i].option,
		 compiler_params[i].min_value);
	else if (compiler_params[i].max_value > compiler_params[i].min_value
		 && value > compiler_params[i].max_value)
	  error ("maximum value of parameter %qs is %u",
		 compiler_params[i].option,
		 compiler_params[i].max_value);
	else
	  {
	    compiler_params[i].value = value;
	    compiler_params[i].set = true;
	  }
	return;
      }
 
  /* If we didn't find this parameter, issue an error message.  */
  error ("invalid parameter %qs", name);
}
 
/* Return the current value of num_compiler_params, for the benefit of
   plugins that use parameters as features.  */
 
size_t
get_num_compiler_params (void)
{
  return num_compiler_params;
}