gcc/params.c

   1 /* params.c - Run-time parameters.
   2    Copyright (C) 2001-2014 Free Software Foundation, Inc.
   3    Written by Mark Mitchell <mark@codesourcery.com>.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "common/common-target.h"
  25 #include "params.h"
  26 #include "diagnostic-core.h"
  27
  28 /* An array containing the compiler parameters and their current
  29    values.  */
  30
  31 param_info *compiler_params;
  32
  33 /* The number of entries in the table.  */
  34 static size_t num_compiler_params;
  35
  36 /* Whether the parameters have all been initialized and had their
  37    default values determined.  */
  38 static bool params_finished;
  39
  40 static const param_info lang_independent_params[] = {
  41 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
  42   { OPTION, DEFAULT, MIN, MAX, HELP },
  43 #include "params.def"
  44 #undef DEFPARAM
  45   { NULL, 0, 0, 0, NULL }
  46 };
  47
  48 /* Add the N PARAMS to the current list of compiler parameters.  */
  49
  50 void
  51 add_params (const param_info params[], size_t n)
  52 {
  53   gcc_assert (!params_finished);
  54
  55   /* Allocate enough space for the new parameters.  */
  56   compiler_params = XRESIZEVEC (param_info, compiler_params,
  57                                 num_compiler_params + n);
  58   /* Copy them into the table.  */
  59   memcpy (compiler_params + num_compiler_params,
  60           params,
  61           n * sizeof (param_info));
  62   /* Keep track of how many parameters we have.  */
  63   num_compiler_params += n;
  64 }
  65
  66 /* Add all parameters and default values that can be set in both the
  67    driver and the compiler proper.  */
  68
  69 void
  70 global_init_params (void)
  71 {
  72   gcc_assert (!params_finished);
  73
  74   add_params (lang_independent_params, LAST_PARAM);
  75   targetm_common.option_default_params ();
  76 }
  77
  78 /* Note that all parameters have been added and all default values
  79    set.  */
  80
  81 void
  82 finish_params (void)
  83 {
  84   params_finished = true;
  85 }
  86
  87 /* Reset all state within params.c so that we can rerun the compiler
  88    within the same process.  For use by toplev::finalize.  */
  89
  90 void
  91 params_c_finalize (void)
  92 {
  93   XDELETEVEC (compiler_params);
  94   compiler_params = NULL;
  95   num_compiler_params = 0;
  96   params_finished = false;
  97 }
  98
  99 /* Set the value of the parameter given by NUM to VALUE in PARAMS and
 100    PARAMS_SET.  If EXPLICIT_P, this is being set by the user;
 101    otherwise it is being set implicitly by the compiler.  */
 102
 103 static void
 104 set_param_value_internal (compiler_param num, int value,
 105                           int *params, int *params_set,
 106                           bool explicit_p)
 107 {
 108   size_t i = (size_t) num;
 109
 110   gcc_assert (params_finished);
 111
 112   params[i] = value;
 113   if (explicit_p)
 114     params_set[i] = true;
 115 }
 116
 117 /* Set the VALUE associated with the parameter given by NAME in PARAMS
 118    and PARAMS_SET.  */
 119
 120 void
 121 set_param_value (const char *name, int value,
 122                  int *params, int *params_set)
 123 {
 124   size_t i;
 125
 126   /* Make sure nobody tries to set a parameter to an invalid value.  */
 127   gcc_assert (value != INVALID_PARAM_VAL);
 128
 129   /* Scan the parameter table to find a matching entry.  */
 130   for (i = 0; i < num_compiler_params; ++i)
 131     if (strcmp (compiler_params[i].option, name) == 0)
 132       {
 133         if (value < compiler_params[i].min_value)
 134           error ("minimum value of parameter %qs is %u",
 135                  compiler_params[i].option,
 136                  compiler_params[i].min_value);
 137         else if (compiler_params[i].max_value > compiler_params[i].min_value
 138                  && value > compiler_params[i].max_value)
 139           error ("maximum value of parameter %qs is %u",
 140                  compiler_params[i].option,
 141                  compiler_params[i].max_value);
 142         else
 143           set_param_value_internal ((compiler_param) i, value,
 144                                     params, params_set, true);
 145         return;
 146       }
 147
 148   /* If we didn't find this parameter, issue an error message.  */
 149   error ("invalid parameter %qs", name);
 150 }
 151
 152 /* Set the value of the parameter given by NUM to VALUE in PARAMS and
 153    PARAMS_SET, implicitly, if it has not been set explicitly by the
 154    user.  */
 155
 156 void
 157 maybe_set_param_value (compiler_param num, int value,
 158                        int *params, int *params_set)
 159 {
 160   if (!params_set[(int) num])
 161     set_param_value_internal (num, value, params, params_set, false);
 162 }
 163
 164 /* Set the default value of a parameter given by NUM to VALUE, before
 165    option processing.  */
 166
 167 void
 168 set_default_param_value (compiler_param num, int value)
 169 {
 170   gcc_assert (!params_finished);
 171
 172   compiler_params[(int) num].default_value = value;
 173 }
 174
 175 /* Return the default value of parameter NUM.  */
 176
 177 int
 178 default_param_value (compiler_param num)
 179 {
 180   return compiler_params[(int) num].default_value;
 181 }
 182
 183 /* Initialize an array PARAMS with default values of the
 184    parameters.  */
 185
 186 void
 187 init_param_values (int *params)
 188 {
 189   size_t i;
 190
 191   gcc_assert (params_finished);
 192
 193   for (i = 0; i < num_compiler_params; i++)
 194     params[i] = compiler_params[i].default_value;
 195 }
 196
 197 /* Return the current value of num_compiler_params, for the benefit of
 198    plugins that use parameters as features.  */
 199
 200 size_t
 201 get_num_compiler_params (void)
 202 {
 203   return num_compiler_params;
 204 }