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 /* Whether the parameters have all been initialized and had their
  39    default values determined.  */
  40 static bool params_finished;
  41
  42 /* Add the N PARAMS to the current list of compiler parameters.  */
  43
  44 void
  45 add_params (const param_info params[], size_t n)
  46 {
  47   gcc_assert (!params_finished);
  48
  49   /* Allocate enough space for the new parameters.  */
  50   compiler_params = XRESIZEVEC (param_info, compiler_params,
  51                                 num_compiler_params + n);
  52   /* Copy them into the table.  */
  53   memcpy (compiler_params + num_compiler_params,
  54           params,
  55           n * sizeof (param_info));
  56   /* Keep track of how many parameters we have.  */
  57   num_compiler_params += n;
  58 }
  59
  60 /* Note that all parameters have been added and all default values
  61    set.  */
  62
  63 void
  64 finish_params (void)
  65 {
  66   params_finished = true;
  67 }
  68
  69 /* Set the value of the parameter given by NUM to VALUE in PARAMS and
  70    PARAMS_SET.  If EXPLICIT_P, this is being set by the user;
  71    otherwise it is being set implicitly by the compiler.  */
  72
  73 static void
  74 set_param_value_internal (compiler_param num, int value,
  75                           int *params, int *params_set,
  76                           bool explicit_p)
  77 {
  78   size_t i = (size_t) num;
  79
  80   gcc_assert (params_finished);
  81
  82   params[i] = value;
  83   if (explicit_p)
  84     params_set[i] = true;
  85 }
  86
  87 /* Set the VALUE associated with the parameter given by NAME in PARAMS
  88    and PARAMS_SET.  */
  89
  90 void
  91 set_param_value (const char *name, int value,
  92                  int *params, int *params_set)
  93 {
  94   size_t i;
  95
  96   /* Make sure nobody tries to set a parameter to an invalid value.  */
  97   gcc_assert (value != INVALID_PARAM_VAL);
  98
  99   /* Scan the parameter table to find a matching entry.  */
 100   for (i = 0; i < num_compiler_params; ++i)
 101     if (strcmp (compiler_params[i].option, name) == 0)
 102       {
 103         if (value < compiler_params[i].min_value)
 104           error ("minimum value of parameter %qs is %u",
 105                  compiler_params[i].option,
 106                  compiler_params[i].min_value);
 107         else if (compiler_params[i].max_value > compiler_params[i].min_value
 108                  && value > compiler_params[i].max_value)
 109           error ("maximum value of parameter %qs is %u",
 110                  compiler_params[i].option,
 111                  compiler_params[i].max_value);
 112         else
 113           set_param_value_internal ((compiler_param) i, value,
 114                                     params, params_set, true);
 115         return;
 116       }
 117
 118   /* If we didn't find this parameter, issue an error message.  */
 119   error ("invalid parameter %qs", name);
 120 }
 121
 122 /* Set the value of the parameter given by NUM to VALUE in PARAMS and
 123    PARAMS_SET, implicitly, if it has not been set explicitly by the
 124    user.  */
 125
 126 void
 127 maybe_set_param_value (compiler_param num, int value,
 128                        int *params, int *params_set)
 129 {
 130   if (!params_set[(int) num])
 131     set_param_value_internal (num, value, params, params_set, false);
 132 }
 133
 134 /* Set the default value of a parameter given by NUM to VALUE, before
 135    option processing.  */
 136
 137 void
 138 set_default_param_value (compiler_param num, int value)
 139 {
 140   gcc_assert (!params_finished);
 141
 142   compiler_params[(int) num].default_value = value;
 143 }
 144
 145 /* Return the default value of parameter NUM.  */
 146
 147 int
 148 default_param_value (compiler_param num)
 149 {
 150   return compiler_params[(int) num].default_value;
 151 }
 152
 153 /* Initialize an array PARAMS with default values of the
 154    parameters.  */
 155
 156 void
 157 init_param_values (int *params)
 158 {
 159   size_t i;
 160
 161   gcc_assert (params_finished);
 162
 163   for (i = 0; i < num_compiler_params; i++)
 164     params[i] = compiler_params[i].default_value;
 165 }
 166
 167 /* Return the current value of num_compiler_params, for the benefit of
 168    plugins that use parameters as features.  */
 169
 170 size_t
 171 get_num_compiler_params (void)
 172 {
 173   return num_compiler_params;
 174 }