params.c revision 132718 
1/* params.c - Run-time parameters.
2   Copyright (C) 2001, 2003 Free Software Foundation, Inc.
3   Written by Mark Mitchell <mark@codesourcery.com>.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free
9Software Foundation; either version 2, or (at your option) any later
10version.
11
12GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or
14FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15for more details.
16
17You should have received a copy of the GNU General Public License
18along with GCC; see the file COPYING.  If not, write to the Free
19Software Foundation, 59 Temple Place - Suite 330, Boston, MA
2002111-1307, 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
34param_info *compiler_params;
35
36/* The number of entries in the table.  */
37
38static size_t num_compiler_params;
39
40/* Add the N PARAMS to the current list of compiler parameters.  */
41
42void
43add_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
58void
59set_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  if (value == INVALID_PARAM_VAL)
65    abort ();
66
67  /* Scan the parameter table to find a matching entry.  */
68  for (i = 0; i < num_compiler_params; ++i)
69    if (strcmp (compiler_params[i].option, name) == 0)
70      {
71	compiler_params[i].value = value;
72	return;
73      }
74
75  /* If we didn't find this parameter, issue an error message.  */
76  error ("invalid parameter `%s'", name);
77}
78