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annotate gcc/params.c @ 132:d34655255c78

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update gcc-8.2
author mir3636
date Thu, 25 Oct 2018 10:21:07 +0900
parents 84e7813d76e9
children
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1 /* params.c - Run-time parameters.
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2 Copyright (C) 2001-2018 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 "diagnostic.h"
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29 #include "spellcheck.h"
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30
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31 /* An array containing the compiler parameters and their current
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32 values. */
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33
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34 param_info *compiler_params;
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35
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36 /* The number of entries in the table. */
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37 static size_t num_compiler_params;
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38
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39 /* Whether the parameters have all been initialized and had their
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40 default values determined. */
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41 static bool params_finished;
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42
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43 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX)
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44 #define DEFPARAMENUM5(ENUM, OPTION, HELP, DEFAULT, V0, V1, V2, V3, V4) \
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45 static const char *values_ ## ENUM [] = { #V0, #V1, #V2, #V3, #V4, NULL };
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46 #include "params.def"
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47 #undef DEFPARAMENUM5
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48 #undef DEFPARAM
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49
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50 static const param_info lang_independent_params[] = {
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51 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
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52 { OPTION, DEFAULT, MIN, MAX, HELP, NULL },
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53 #define DEFPARAMENUM5(ENUM, OPTION, HELP, DEFAULT, \
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54 V0, V1, V2, V3, V4) \
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55 { OPTION, (int)ENUM ## _KIND_ ## DEFAULT, 0, 4, HELP, values_ ## ENUM },
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56 #include "params.def"
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57 #undef DEFPARAM
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58 #undef DEFPARAMENUM5
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59 { NULL, 0, 0, 0, NULL, NULL }
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60 };
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61
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62 static bool
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63 validate_param (const int value, const param_info param, const int index);
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64
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65
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66 /* Add the N PARAMS to the current list of compiler parameters. */
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67
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68 void
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69 add_params (const param_info params[], size_t n)
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70 {
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71 gcc_assert (!params_finished);
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72
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73 /* Allocate enough space for the new parameters. */
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74 compiler_params = XRESIZEVEC (param_info, compiler_params,
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75 num_compiler_params + n);
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76 param_info *dst_params = compiler_params + num_compiler_params;
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77
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78 /* Copy them into the table. */
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79 memcpy (dst_params, params, n * sizeof (param_info));
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80
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81 /* Keep track of how many parameters we have. */
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82 num_compiler_params += n;
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83
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84 /* Initialize the pretty printing machinery in case we need to print an error,
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85 but be sure not to initialize it if something else already has, e.g. a
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86 language front-end like cc1. */
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87 if (!diagnostic_ready_p ())
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88 diagnostic_initialize (global_dc, 0);
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89
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90 /* Now perform some validation and validation failures trigger an error so
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91 initialization will stop. */
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92 for (size_t i = num_compiler_params - n; i < n; i++)
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93 validate_param (params[i].default_value, params[i], (int)i);
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94 }
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95
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96 /* Add all parameters and default values that can be set in both the
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97 driver and the compiler proper. */
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98
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99 void
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100 global_init_params (void)
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101 {
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102 gcc_assert (!params_finished);
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103
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104 add_params (lang_independent_params, LAST_PARAM);
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105 targetm_common.option_default_params ();
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106 }
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107
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108 /* Note that all parameters have been added and all default values
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109 set. */
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110
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111 void
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112 finish_params (void)
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113 {
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114 params_finished = true;
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115 }
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116
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117 /* Reset all state within params.c so that we can rerun the compiler
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118 within the same process. For use by toplev::finalize. */
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119
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120 void
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121 params_c_finalize (void)
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122 {
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123 XDELETEVEC (compiler_params);
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124 compiler_params = NULL;
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125 num_compiler_params = 0;
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126 params_finished = false;
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127 }
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128
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129 /* Set the value of the parameter given by NUM to VALUE in PARAMS and
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130 PARAMS_SET. If EXPLICIT_P, this is being set by the user;
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131 otherwise it is being set implicitly by the compiler. */
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132
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133 static void
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134 set_param_value_internal (compiler_param num, int value,
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135 int *params, int *params_set,
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136 bool explicit_p)
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137 {
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138 size_t i = (size_t) num;
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139
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140 gcc_assert (params_finished);
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141
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142 params[i] = value;
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143 if (explicit_p)
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144 params_set[i] = true;
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145 }
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146
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147 /* Validate PARAM and write an error if invalid. */
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148
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149 static bool
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150 validate_param (const int value, const param_info param, const int index)
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151 {
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152 /* These paremeters interpret bounds of 0 to be unbounded, as such don't
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153 perform any range validation on 0 parameters. */
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154 if (value < param.min_value && param.min_value != 0)
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155 {
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156 error ("minimum value of parameter %qs is %u",
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157 param.option, param.min_value);
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158 return false;
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159 }
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160 else if (param.max_value > param.min_value && value > param.max_value)
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161 {
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162 error ("maximum value of parameter %qs is %u",
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163 param.option, param.max_value);
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164 return false;
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165 }
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166 else if (targetm_common.option_validate_param (value, index))
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167 return true;
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168
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169 return false;
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170 }
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171
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172 /* Return true if it can find the matching entry for NAME in the parameter
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173 table, and assign the entry index to INDEX. Return false otherwise. */
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174
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175 bool
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176 find_param (const char *name, enum compiler_param *index)
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177 {
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178 for (size_t i = 0; i < num_compiler_params; ++i)
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179 if (strcmp (compiler_params[i].option, name) == 0)
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180 {
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181 *index = (enum compiler_param) i;
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182 return true;
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183 }
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184
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185 return false;
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186 }
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187
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188 /* Look for the closest match for NAME in the parameter table, returning it
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189 if it is a reasonable suggestion for a misspelling. Return NULL
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190 otherwise. */
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191
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192 const char *
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193 find_param_fuzzy (const char *name)
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194 {
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195 best_match <const char *, const char *> bm (name);
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196 for (size_t i = 0; i < num_compiler_params; ++i)
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197 bm.consider (compiler_params[i].option);
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198 return bm.get_best_meaningful_candidate ();
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199 }
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200
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201 /* Return true if param with entry index INDEX should be defined using strings.
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202 If so, return the value corresponding to VALUE_NAME in *VALUE_P. */
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203
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204 bool
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205 param_string_value_p (enum compiler_param index, const char *value_name,
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206 int *value_p)
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207 {
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208 param_info *entry = &compiler_params[(int) index];
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209 if (entry->value_names == NULL)
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210 return false;
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211
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212 *value_p = -1;
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213
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214 for (int i = 0; entry->value_names[i] != NULL; ++i)
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215 if (strcmp (entry->value_names[i], value_name) == 0)
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216 {
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217 *value_p = i;
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218 return true;
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219 }
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220
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221 return true;
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222 }
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223
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224 /* Set the VALUE associated with the parameter given by NAME in PARAMS
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225 and PARAMS_SET. */
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226
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227 void
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228 set_param_value (const char *name, int value,
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229 int *params, int *params_set)
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230 {
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231 size_t i;
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232
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233 /* Make sure nobody tries to set a parameter to an invalid value. */
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234 gcc_assert (value != INVALID_PARAM_VAL);
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235
111
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236 enum compiler_param index;
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237 if (!find_param (name, &index))
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238 {
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239 /* If we didn't find this parameter, issue an error message. */
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240 error ("invalid parameter %qs", name);
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241 return;
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242 }
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243 i = (size_t)index;
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244
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245 if (validate_param (value, compiler_params[i], i))
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246 set_param_value_internal ((compiler_param) i, value,
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247 params, params_set, true);
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248 }
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249
67
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250 /* Set the value of the parameter given by NUM to VALUE in PARAMS and
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251 PARAMS_SET, implicitly, if it has not been set explicitly by the
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252 user either via the commandline or configure. */
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253
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254 void
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255 maybe_set_param_value (compiler_param num, int value,
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256 int *params, int *params_set)
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257 {
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258 if (!params_set[(int) num])
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259 set_param_value_internal (num, value, params, params_set, false);
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260 }
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261
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262 /* Set the default value of a parameter given by NUM to VALUE, before
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263 option processing. */
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264
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265 void
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266 set_default_param_value (compiler_param num, int value)
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267 {
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268 gcc_assert (!params_finished);
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269
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270 compiler_params[(int) num].default_value = value;
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271 }
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272
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273 /* Return the default value of parameter NUM. */
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274
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275 int
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276 default_param_value (compiler_param num)
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277 {
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278 return compiler_params[(int) num].default_value;
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279 }
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280
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281 /* Initialize an array PARAMS with default values of the
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282 parameters. */
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283
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284 void
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285 init_param_values (int *params)
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286 {
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287 size_t i;
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288
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289 gcc_assert (params_finished);
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290
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291 for (i = 0; i < num_compiler_params; i++)
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292 params[i] = compiler_params[i].default_value;
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293 }
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294
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295 /* Return the current value of num_compiler_params, for the benefit of
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296 plugins that use parameters as features. */
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297
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298 size_t
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299 get_num_compiler_params (void)
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300 {
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301 return num_compiler_params;
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302 }