gcc/params.c

   1 /* params.c - Run-time parameters.
   2    Copyright (C) 2001, 2003, 2004, 2005, 2007, 2008, 2009, 2010
   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 "diagnostic-core.h"
  28 #include "toplev.h"
  29
  30 /* An array containing the compiler parameters and their current
  31    values.  */
  32
  33 param_info *compiler_params;
  34
  35 /* The number of entries in the table.  */
  36 static size_t num_compiler_params;
  37
  38 /* Add the N PARAMS to the current list of compiler parameters.  */
  39
  40 void
  41 add_params (const param_info params[], size_t n)
  42 {
  43   /* Allocate enough space for the new parameters.  */
  44   compiler_params = XRESIZEVEC (param_info, compiler_params,
  45                                 num_compiler_params + n);
  46   /* Copy them into the table.  */
  47   memcpy (compiler_params + num_compiler_params,
  48           params,
  49           n * sizeof (param_info));
  50   /* Keep track of how many parameters we have.  */
  51   num_compiler_params += n;
  52 }
  53
  54 /* Set the value of the parameter given by NUM to VALUE.  If
  55    EXPLICIT_P, this is being set by the user; otherwise it is being
  56    set implicitly by the compiler.  */
  57
  58 static void
  59 set_param_value_internal (compiler_param num, int value,
  60                           bool explicit_p)
  61 {
  62   size_t i = (size_t) num;
  63
  64   compiler_params[i].value = value;
  65   if (explicit_p)
  66     compiler_params[i].set = true;
  67 }
  68
  69 /* Set the VALUE associated with the parameter given by NAME.  */
  70
  71 void
  72 set_param_value (const char *name, int value)
  73 {
  74   size_t i;
  75
  76   /* Make sure nobody tries to set a parameter to an invalid value.  */
  77   gcc_assert (value != INVALID_PARAM_VAL);
  78
  79   /* Scan the parameter table to find a matching entry.  */
  80   for (i = 0; i < num_compiler_params; ++i)
  81     if (strcmp (compiler_params[i].option, name) == 0)
  82       {
  83         if (value < compiler_params[i].min_value)
  84           error ("minimum value of parameter %qs is %u",
  85                  compiler_params[i].option,
  86                  compiler_params[i].min_value);
  87         else if (compiler_params[i].max_value > compiler_params[i].min_value
  88                  && value > compiler_params[i].max_value)
  89           error ("maximum value of parameter %qs is %u",
  90                  compiler_params[i].option,
  91                  compiler_params[i].max_value);
  92         else
  93           set_param_value_internal ((compiler_param) i, value, true);
  94         return;
  95       }
  96
  97   /* If we didn't find this parameter, issue an error message.  */
  98   error ("invalid parameter %qs", name);
  99 }
 100
 101 /* Set the value of the parameter given by NUM to VALUE, implicitly,
 102    if it has not been set explicitly by the user.  */
 103
 104 void
 105 maybe_set_param_value (compiler_param num, int value)
 106 {
 107   if (!PARAM_SET_P (num))
 108     set_param_value_internal (num, value, false);
 109 }
 110
 111 /* Set the default value of a parameter given by NUM to VALUE, before
 112    option processing.  */
 113
 114 void
 115 set_default_param_value (compiler_param num, int value)
 116 {
 117   gcc_assert (!PARAM_SET_P (num));
 118   set_param_value_internal (num, value, false);
 119 }
 120
 121 /* Return the current value of num_compiler_params, for the benefit of
 122    plugins that use parameters as features.  */
 123
 124 size_t
 125 get_num_compiler_params (void)
 126 {
 127   return num_compiler_params;
 128 }