annotate gcc/params.c @ 16:04ced10e8804

gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents f6334be47118
children 84e7813d76e9
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1 /* params.c - Run-time parameters.
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2 Copyright (C) 2001-2017 Free Software Foundation, Inc.
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3 Written by Mark Mitchell <mark@codesourcery.com>.
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it under
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8 the terms of the GNU General Public License as published by the Free
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9 Software Foundation; either version 3, or (at your option) any later
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10 version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21 #include "config.h"
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22 #include "system.h"
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23 #include "coretypes.h"
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24 #include "common/common-target.h"
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25 #include "params.h"
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26 #include "params-enum.h"
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27 #include "diagnostic-core.h"
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28 #include "spellcheck.h"
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29
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30 /* An array containing the compiler parameters and their current
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31 values. */
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32
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33 param_info *compiler_params;
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34
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35 /* The number of entries in the table. */
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36 static size_t num_compiler_params;
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37
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38 /* Whether the parameters have all been initialized and had their
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39 default values determined. */
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40 static bool params_finished;
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41
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42 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX)
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43 #define DEFPARAMENUM5(ENUM, OPTION, HELP, DEFAULT, V0, V1, V2, V3, V4) \
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44 static const char *values_ ## ENUM [] = { #V0, #V1, #V2, #V3, #V4, NULL };
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45 #include "params.def"
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46 #undef DEFPARAMENUM5
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47 #undef DEFPARAM
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48
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49 static const param_info lang_independent_params[] = {
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50 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
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51 { OPTION, DEFAULT, MIN, MAX, HELP, NULL },
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52 #define DEFPARAMENUM5(ENUM, OPTION, HELP, DEFAULT, \
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53 V0, V1, V2, V3, V4) \
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54 { OPTION, (int)ENUM ## _KIND_ ## DEFAULT, 0, 4, HELP, values_ ## ENUM },
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55 #include "params.def"
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56 #undef DEFPARAM
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57 #undef DEFPARAMENUM5
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58 { NULL, 0, 0, 0, NULL, NULL }
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59 };
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60
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61 /* Add the N PARAMS to the current list of compiler parameters. */
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62
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63 void
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64 add_params (const param_info params[], size_t n)
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65 {
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66 gcc_assert (!params_finished);
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67
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68 /* Allocate enough space for the new parameters. */
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69 compiler_params = XRESIZEVEC (param_info, compiler_params,
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70 num_compiler_params + n);
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71 /* Copy them into the table. */
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72 memcpy (compiler_params + num_compiler_params,
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73 params,
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74 n * sizeof (param_info));
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75 /* Keep track of how many parameters we have. */
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76 num_compiler_params += n;
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77 }
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78
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79 /* Add all parameters and default values that can be set in both the
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80 driver and the compiler proper. */
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81
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82 void
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83 global_init_params (void)
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84 {
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85 gcc_assert (!params_finished);
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86
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87 add_params (lang_independent_params, LAST_PARAM);
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88 targetm_common.option_default_params ();
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89 }
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90
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91 /* Note that all parameters have been added and all default values
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92 set. */
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93
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94 void
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95 finish_params (void)
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96 {
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97 params_finished = true;
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98 }
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99
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100 /* Reset all state within params.c so that we can rerun the compiler
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101 within the same process. For use by toplev::finalize. */
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102
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103 void
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104 params_c_finalize (void)
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105 {
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106 XDELETEVEC (compiler_params);
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107 compiler_params = NULL;
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108 num_compiler_params = 0;
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109 params_finished = false;
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110 }
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111
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112 /* Set the value of the parameter given by NUM to VALUE in PARAMS and
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113 PARAMS_SET. If EXPLICIT_P, this is being set by the user;
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114 otherwise it is being set implicitly by the compiler. */
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115
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116 static void
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117 set_param_value_internal (compiler_param num, int value,
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118 int *params, int *params_set,
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119 bool explicit_p)
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120 {
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121 size_t i = (size_t) num;
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122
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123 gcc_assert (params_finished);
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124
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125 params[i] = value;
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126 if (explicit_p)
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127 params_set[i] = true;
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128 }
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129
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130 /* Return true if it can find the matching entry for NAME in the parameter
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131 table, and assign the entry index to INDEX. Return false otherwise. */
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132
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133 bool
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134 find_param (const char *name, enum compiler_param *index)
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135 {
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136 for (size_t i = 0; i < num_compiler_params; ++i)
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137 if (strcmp (compiler_params[i].option, name) == 0)
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138 {
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139 *index = (enum compiler_param) i;
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140 return true;
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141 }
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142
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143 return false;
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144 }
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145
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146 /* Look for the closest match for NAME in the parameter table, returning it
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147 if it is a reasonable suggestion for a misspelling. Return NULL
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148 otherwise. */
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149
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150 const char *
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151 find_param_fuzzy (const char *name)
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152 {
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153 best_match <const char *, const char *> bm (name);
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154 for (size_t i = 0; i < num_compiler_params; ++i)
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155 bm.consider (compiler_params[i].option);
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156 return bm.get_best_meaningful_candidate ();
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157 }
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158
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159 /* Return true if param with entry index INDEX should be defined using strings.
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160 If so, return the value corresponding to VALUE_NAME in *VALUE_P. */
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161
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162 bool
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163 param_string_value_p (enum compiler_param index, const char *value_name,
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164 int *value_p)
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165 {
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166 param_info *entry = &compiler_params[(int) index];
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167 if (entry->value_names == NULL)
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168 return false;
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169
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170 *value_p = -1;
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171
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172 for (int i = 0; entry->value_names[i] != NULL; ++i)
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173 if (strcmp (entry->value_names[i], value_name) == 0)
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174 {
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175 *value_p = i;
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176 return true;
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177 }
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178
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179 return true;
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180 }
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181
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182 /* Set the VALUE associated with the parameter given by NAME in PARAMS
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183 and PARAMS_SET. */
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184
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185 void
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186 set_param_value (const char *name, int value,
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187 int *params, int *params_set)
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188 {
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189 size_t i;
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190
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191 /* Make sure nobody tries to set a parameter to an invalid value. */
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192 gcc_assert (value != INVALID_PARAM_VAL);
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193
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194 enum compiler_param index;
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195 if (!find_param (name, &index))
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196 {
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197 /* If we didn't find this parameter, issue an error message. */
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198 error ("invalid parameter %qs", name);
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199 return;
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200 }
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201 i = (size_t)index;
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202
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203 if (value < compiler_params[i].min_value)
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204 error ("minimum value of parameter %qs is %u",
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205 compiler_params[i].option,
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206 compiler_params[i].min_value);
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207 else if (compiler_params[i].max_value > compiler_params[i].min_value
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208 && value > compiler_params[i].max_value)
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209 error ("maximum value of parameter %qs is %u",
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210 compiler_params[i].option,
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211 compiler_params[i].max_value);
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212 else
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213 set_param_value_internal ((compiler_param) i, value,
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214 params, params_set, true);
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215 }
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216
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217 /* Set the value of the parameter given by NUM to VALUE in PARAMS and
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218 PARAMS_SET, implicitly, if it has not been set explicitly by the
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219 user. */
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220
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221 void
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222 maybe_set_param_value (compiler_param num, int value,
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223 int *params, int *params_set)
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224 {
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225 if (!params_set[(int) num])
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226 set_param_value_internal (num, value, params, params_set, false);
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227 }
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228
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229 /* Set the default value of a parameter given by NUM to VALUE, before
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230 option processing. */
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231
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232 void
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233 set_default_param_value (compiler_param num, int value)
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234 {
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235 gcc_assert (!params_finished);
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236
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237 compiler_params[(int) num].default_value = value;
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238 }
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239
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240 /* Return the default value of parameter NUM. */
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241
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242 int
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243 default_param_value (compiler_param num)
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244 {
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245 return compiler_params[(int) num].default_value;
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246 }
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247
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248 /* Initialize an array PARAMS with default values of the
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249 parameters. */
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250
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251 void
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252 init_param_values (int *params)
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253 {
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254 size_t i;
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255
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256 gcc_assert (params_finished);
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257
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258 for (i = 0; i < num_compiler_params; i++)
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259 params[i] = compiler_params[i].default_value;
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260 }
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261
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262 /* Return the current value of num_compiler_params, for the benefit of
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263 plugins that use parameters as features. */
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264
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265 size_t
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266 get_num_compiler_params (void)
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267 {
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268 return num_compiler_params;
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269 }