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
  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 /* Whether the parameters have all been initialized and had their
  38    default values determined.  */
  39 static bool params_finished;
  40
  41 /* Add the N PARAMS to the current list of compiler parameters.  */
  42
  43 void
  44 add_params (const param_info params[], size_t n)
  45 {
  46   gcc_assert (!params_finished);
  47
  48   /* Allocate enough space for the new parameters.  */
  49   compiler_params = XRESIZEVEC (param_info, compiler_params,
  50                                 num_compiler_params + n);
  51   /* Copy them into the table.  */
  52   memcpy (compiler_params + num_compiler_params,
  53           params,
  54           n * sizeof (param_info));
  55   /* Keep track of how many parameters we have.  */
  56   num_compiler_params += n;
  57 }
  58
  59 /* Note that all parameters have been added and all default values
  60    set.  */
  61
  62 void
  63 finish_params (void)
  64 {
  65   params_finished = true;
  66 }
  67
  68 /* Set the value of the parameter given by NUM to VALUE in PARAMS and
  69    PARAMS_SET.  If EXPLICIT_P, this is being set by the user;
  70    otherwise it is being set implicitly by the compiler.  */
  71
  72 static void
  73 set_param_value_internal (compiler_param num, int value,
  74                           int *params, int *params_set,
  75                           bool explicit_p)
  76 {
  77   size_t i = (size_t) num;
  78
  79   gcc_assert (params_finished);
  80
  81   params[i] = value;
  82   if (explicit_p)
  83     params_set[i] = true;
  84 }
  85
  86 /* Set the VALUE associated with the parameter given by NAME in PARAMS
  87    and PARAMS_SET.  */
  88
  89 void
  90 set_param_value (const char *name, int value,
  91                  int *params, int *params_set)
  92 {
  93   size_t i;
  94
  95   /* Make sure nobody tries to set a parameter to an invalid value.  */
  96   gcc_assert (value != INVALID_PARAM_VAL);
  97
  98   /* Scan the parameter table to find a matching entry.  */
  99   for (i = 0; i < num_compiler_params; ++i)
 100     if (strcmp (compiler_params[i].option, name) == 0)
 101       {
 102         if (value < compiler_params[i].min_value)
 103           error ("minimum value of parameter %qs is %u",
 104                  compiler_params[i].option,
 105                  compiler_params[i].min_value);
 106         else if (compiler_params[i].max_value > compiler_params[i].min_value
 107                  && value > compiler_params[i].max_value)
 108           error ("maximum value of parameter %qs is %u",
 109                  compiler_params[i].option,
 110                  compiler_params[i].max_value);
 111         else
 112           set_param_value_internal ((compiler_param) i, value,
 113                                     params, params_set, true);
 114         return;
 115       }
 116
 117   /* If we didn't find this parameter, issue an error message.  */
 118   error ("invalid parameter %qs", name);
 119 }
 120
 121 /* Set the value of the parameter given by NUM to VALUE in PARAMS and
 122    PARAMS_SET, implicitly, if it has not been set explicitly by the
 123    user.  */
 124
 125 void
 126 maybe_set_param_value (compiler_param num, int value,
 127                        int *params, int *params_set)
 128 {
 129   if (!params_set[(int) num])
 130     set_param_value_internal (num, value, params, params_set, false);
 131 }
 132
 133 /* Set the default value of a parameter given by NUM to VALUE, before
 134    option processing.  */
 135
 136 void
 137 set_default_param_value (compiler_param num, int value)
 138 {
 139   gcc_assert (!params_finished);
 140
 141   compiler_params[(int) num].default_value = value;
 142 }
 143
 144 /* Return the default value of parameter NUM.  */
 145
 146 int
 147 default_param_value (compiler_param num)
 148 {
 149   return compiler_params[(int) num].default_value;
 150 }
 151
 152 /* Initialize an array PARAMS with default values of the
 153    parameters.  */
 154
 155 void
 156 init_param_values (int *params)
 157 {
 158   size_t i;
 159
 160   gcc_assert (params_finished);
 161
 162   for (i = 0; i < num_compiler_params; i++)
 163     params[i] = compiler_params[i].default_value;
 164 }
 165
 166 /* Return the current value of num_compiler_params, for the benefit of
 167    plugins that use parameters as features.  */
 168
 169 size_t
 170 get_num_compiler_params (void)
 171 {
 172   return num_compiler_params;
 173 }