gcc/params.c

   1 /* params.c - Run-time parameters.
   2    Copyright (C) 2001, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
   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 "common/common-target.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 static const param_info lang_independent_params[] = {
  42 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
  43   { OPTION, DEFAULT, MIN, MAX, HELP },
  44 #include "params.def"
  45 #undef DEFPARAM
  46   { NULL, 0, 0, 0, NULL }
  47 };
  48
  49 /* Add the N PARAMS to the current list of compiler parameters.  */
  50
  51 void
  52 add_params (const param_info params[], size_t n)
  53 {
  54   gcc_assert (!params_finished);
  55
  56   /* Allocate enough space for the new parameters.  */
  57   compiler_params = XRESIZEVEC (param_info, compiler_params,
  58                                 num_compiler_params + n);
  59   /* Copy them into the table.  */
  60   memcpy (compiler_params + num_compiler_params,
  61           params,
  62           n * sizeof (param_info));
  63   /* Keep track of how many parameters we have.  */
  64   num_compiler_params += n;
  65 }
  66
  67 /* Add all parameters and default values that can be set in both the
  68    driver and the compiler proper.  */
  69
  70 void
  71 global_init_params (void)
  72 {
  73   add_params (lang_independent_params, LAST_PARAM);
  74   targetm_common.option_default_params ();
  75 }
  76
  77 /* Note that all parameters have been added and all default values
  78    set.  */
  79
  80 void
  81 finish_params (void)
  82 {
  83   params_finished = true;
  84 }
  85
  86 /* Set the value of the parameter given by NUM to VALUE in PARAMS and
  87    PARAMS_SET.  If EXPLICIT_P, this is being set by the user;
  88    otherwise it is being set implicitly by the compiler.  */
  89
  90 static void
  91 set_param_value_internal (compiler_param num, int value,
  92                           int *params, int *params_set,
  93                           bool explicit_p)
  94 {
  95   size_t i = (size_t) num;
  96
  97   gcc_assert (params_finished);
  98
  99   params[i] = value;
 100   if (explicit_p)
 101     params_set[i] = true;
 102 }
 103
 104 /* Set the VALUE associated with the parameter given by NAME in PARAMS
 105    and PARAMS_SET.  */
 106
 107 void
 108 set_param_value (const char *name, int value,
 109                  int *params, int *params_set)
 110 {
 111   size_t i;
 112
 113   /* Make sure nobody tries to set a parameter to an invalid value.  */
 114   gcc_assert (value != INVALID_PARAM_VAL);
 115
 116   /* Scan the parameter table to find a matching entry.  */
 117   for (i = 0; i < num_compiler_params; ++i)
 118     if (strcmp (compiler_params[i].option, name) == 0)
 119       {
 120         if (value < compiler_params[i].min_value)
 121           error ("minimum value of parameter %qs is %u",
 122                  compiler_params[i].option,
 123                  compiler_params[i].min_value);
 124         else if (compiler_params[i].max_value > compiler_params[i].min_value
 125                  && value > compiler_params[i].max_value)
 126           error ("maximum value of parameter %qs is %u",
 127                  compiler_params[i].option,
 128                  compiler_params[i].max_value);
 129         else
 130           set_param_value_internal ((compiler_param) i, value,
 131                                     params, params_set, true);
 132         return;
 133       }
 134
 135   /* If we didn't find this parameter, issue an error message.  */
 136   error ("invalid parameter %qs", name);
 137 }
 138
 139 /* Set the value of the parameter given by NUM to VALUE in PARAMS and
 140    PARAMS_SET, implicitly, if it has not been set explicitly by the
 141    user.  */
 142
 143 void
 144 maybe_set_param_value (compiler_param num, int value,
 145                        int *params, int *params_set)
 146 {
 147   if (!params_set[(int) num])
 148     set_param_value_internal (num, value, params, params_set, false);
 149 }
 150
 151 /* Set the default value of a parameter given by NUM to VALUE, before
 152    option processing.  */
 153
 154 void
 155 set_default_param_value (compiler_param num, int value)
 156 {
 157   gcc_assert (!params_finished);
 158
 159   compiler_params[(int) num].default_value = value;
 160 }
 161
 162 /* Return the default value of parameter NUM.  */
 163
 164 int
 165 default_param_value (compiler_param num)
 166 {
 167   return compiler_params[(int) num].default_value;
 168 }
 169
 170 /* Initialize an array PARAMS with default values of the
 171    parameters.  */
 172
 173 void
 174 init_param_values (int *params)
 175 {
 176   size_t i;
 177
 178   gcc_assert (params_finished);
 179
 180   for (i = 0; i < num_compiler_params; i++)
 181     params[i] = compiler_params[i].default_value;
 182 }
 183
 184 /* Return the current value of num_compiler_params, for the benefit of
 185    plugins that use parameters as features.  */
 186
 187 size_t
 188 get_num_compiler_params (void)
 189 {
 190   return num_compiler_params;
 191 }