Mercurial > hg > CbC > CbC_gcc
annotate gcc/lto-opts.c @ 55:77e2b8dfacca gcc-4.4.5
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author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
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date | Fri, 12 Feb 2010 23:39:51 +0900 |
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children | b7f97abdc517 |
rev | line source |
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55
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1 /* LTO IL options. |
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2 |
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3 Copyright 2009 Free Software Foundation, Inc. |
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4 Contributed by Simon Baldwin <simonb@google.com> |
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5 |
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6 This file is part of GCC. |
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7 |
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8 GCC is free software; you can redistribute it and/or modify it under |
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9 the terms of the GNU General Public License as published by the Free |
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10 Software Foundation; either version 3, or (at your option) any later |
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11 version. |
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12 |
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13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
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14 WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with GCC; see the file COPYING3. If not see |
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20 <http://www.gnu.org/licenses/>. */ |
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21 |
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22 #include "config.h" |
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23 #include "system.h" |
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24 #include "coretypes.h" |
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25 #include "tree.h" |
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26 #include "hashtab.h" |
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27 #include "ggc.h" |
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28 #include "vec.h" |
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29 #include "bitmap.h" |
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30 #include "flags.h" |
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31 #include "opts.h" |
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32 #include "options.h" |
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33 #include "target.h" |
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34 #include "toplev.h" |
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35 #include "lto-streamer.h" |
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36 |
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37 /* When a file is initially compiled, the options used when generating |
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38 the IL are not necessarily the same as those used when linking the |
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39 objects into the final executable. In general, most build systems |
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40 will proceed with something along the lines of: |
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41 |
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42 $ gcc <cc-flags> -flto -c f1.c -o f1.o |
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43 $ gcc <cc-flags> -flto -c f2.c -o f2.o |
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44 ... |
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45 $ gcc <cc-flags> -flto -c fN.c -o fN.o |
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46 |
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47 And the final link may or may not include the same <cc-flags> used |
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48 to generate the initial object files: |
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49 |
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50 $ gcc <ld-flags> -flto -o prog f1.o ... fN.o |
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51 |
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52 Since we will be generating final code during the link step, some |
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53 of the flags used during the compile step need to be re-applied |
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54 during the link step. For instance, flags in the -m family. |
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55 |
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56 The idea is to save a selected set of <cc-flags> in a special |
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57 section of the initial object files. This section is then read |
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58 during linking and the options re-applied. |
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59 |
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60 FIXME lto. Currently the scheme is limited in that only the |
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61 options saved on the first object file (f1.o) are read back during |
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62 the link step. This means that the options used to compile f1.o |
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63 will be applied to ALL the object files in the final link step. |
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64 More work needs to be done to implement a merging and validation |
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65 mechanism, as this will not be enough for all cases. */ |
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66 |
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67 /* Saved options hold the type of the option (currently CL_TARGET or |
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68 CL_COMMON), and the code, argument, and value. */ |
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69 |
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70 typedef struct GTY(()) opt_d |
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71 { |
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72 unsigned int type; |
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73 size_t code; |
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74 char *arg; |
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75 int value; |
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76 } opt_t; |
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77 |
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78 DEF_VEC_O (opt_t); |
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79 DEF_VEC_ALLOC_O (opt_t, heap); |
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80 |
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81 |
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82 /* Options are held in two vectors, one for those registered by |
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83 command line handling code, and the other for those read in from |
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84 any LTO IL input. */ |
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85 static VEC(opt_t, heap) *user_options = NULL; |
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86 static VEC(opt_t, heap) *file_options = NULL; |
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87 |
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88 /* Iterate FROM in reverse, writing option codes not yet in CODES into *TO. |
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89 Mark each new option code encountered in CODES. */ |
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90 |
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91 static void |
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92 reverse_iterate_options (VEC(opt_t, heap) *from, VEC(opt_t, heap) **to, |
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93 bitmap codes) |
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94 { |
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95 int i; |
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96 |
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97 for (i = VEC_length (opt_t, from); i > 0; i--) |
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98 { |
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99 const opt_t *const o = VEC_index (opt_t, from, i - 1); |
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100 |
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101 if (bitmap_set_bit (codes, o->code)) |
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102 VEC_safe_push (opt_t, heap, *to, o); |
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103 } |
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104 } |
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105 |
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106 /* Concatenate options vectors FIRST and SECOND, rationalize so that only the |
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107 final of any given option remains, and return the result. */ |
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108 |
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109 static VEC(opt_t, heap) * |
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110 concatenate_options (VEC(opt_t, heap) *first, VEC(opt_t, heap) *second) |
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111 { |
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112 VEC(opt_t, heap) *results = NULL; |
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113 bitmap codes = lto_bitmap_alloc (); |
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114 |
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115 reverse_iterate_options (second, &results, codes); |
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116 reverse_iterate_options (first, &results, codes); |
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117 |
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118 lto_bitmap_free (codes); |
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119 return results; |
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120 } |
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121 |
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122 /* Clear the options vector in *OPTS_P and set it to NULL. */ |
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123 |
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124 static void |
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125 clear_options (VEC(opt_t, heap) **opts_p) |
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126 { |
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127 int i; |
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128 opt_t *o; |
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129 |
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130 for (i = 0; VEC_iterate (opt_t, *opts_p, i, o); i++) |
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131 free (o->arg); |
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132 |
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133 VEC_free (opt_t, heap, *opts_p); |
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134 } |
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135 |
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136 /* Write LENGTH bytes from ADDR to STREAM. */ |
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137 |
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138 static void |
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139 output_data_stream (struct lto_output_stream *stream, |
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140 const void *addr, size_t length) |
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141 { |
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142 lto_output_data_stream (stream, addr, length); |
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143 } |
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144 |
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145 /* Write string STRING to STREAM. */ |
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146 |
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147 static void |
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148 output_string_stream (struct lto_output_stream *stream, const char *string) |
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149 { |
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150 bool flag = false; |
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151 |
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152 if (string != NULL) |
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153 { |
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154 const size_t length = strlen (string); |
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155 |
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156 flag = true; |
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157 output_data_stream (stream, &flag, sizeof (flag)); |
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158 output_data_stream (stream, &length, sizeof (length)); |
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159 output_data_stream (stream, string, length); |
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160 } |
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161 else |
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162 output_data_stream (stream, &flag, sizeof (flag)); |
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163 } |
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164 |
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165 /* Read LENGTH bytes from STREAM to ADDR. */ |
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166 |
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167 static void |
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168 input_data_block (struct lto_input_block *ib, void *addr, size_t length) |
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169 { |
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170 size_t i; |
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171 unsigned char *const buffer = (unsigned char *const) addr; |
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172 |
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173 for (i = 0; i < length; i++) |
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174 buffer[i] = lto_input_1_unsigned (ib); |
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175 } |
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176 |
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177 /* Return a string from IB. The string is allocated, and the caller is |
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178 responsible for freeing it. */ |
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179 |
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180 static char * |
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181 input_string_block (struct lto_input_block *ib) |
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182 { |
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183 bool flag; |
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184 |
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185 input_data_block (ib, &flag, sizeof (flag)); |
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186 if (flag) |
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187 { |
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188 size_t length; |
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189 char *string; |
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190 |
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191 input_data_block (ib, &length, sizeof (length)); |
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192 string = (char *) xcalloc (1, length + 1); |
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193 input_data_block (ib, string, length); |
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194 |
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195 return string; |
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196 } |
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197 else |
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198 return NULL; |
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199 } |
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200 |
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201 /* Return true if this option is one we need to save in LTO output files. |
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202 At present, we pass along all target options, and common options that |
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203 involve position independent code. |
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204 |
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205 TODO This list of options requires expansion and rationalization. |
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206 Among others, optimization options may well be appropriate here. */ |
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207 |
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208 static bool |
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209 register_user_option_p (size_t code, int type) |
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210 { |
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211 if (type == CL_TARGET) |
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212 return true; |
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213 else if (type == CL_COMMON) |
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214 { |
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215 return (code == OPT_fPIC |
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216 || code == OPT_fpic |
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217 || code == OPT_fPIE |
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218 || code == OPT_fpie |
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219 || code == OPT_fcommon |
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220 || code == OPT_fexceptions); |
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221 } |
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222 |
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223 return false; |
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224 } |
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225 |
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226 /* Note command line option with the given TYPE and CODE, ARG, and VALUE. |
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227 If relevant to LTO, save it in the user options vector. */ |
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228 |
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229 void |
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230 lto_register_user_option (size_t code, const char *arg, int value, int type) |
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231 { |
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232 if (register_user_option_p (code, type)) |
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233 { |
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234 opt_t o; |
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235 |
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236 o.type = type; |
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237 o.code = code; |
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238 if (arg != NULL) |
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239 { |
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240 o.arg = (char *) xmalloc (strlen (arg) + 1); |
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241 strcpy (o.arg, arg); |
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242 } |
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243 else |
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244 o.arg = NULL; |
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245 o.value = value; |
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246 VEC_safe_push (opt_t, heap, user_options, &o); |
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247 } |
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248 } |
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249 |
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250 /* Empty the saved user options vector. */ |
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251 |
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252 void |
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253 lto_clear_user_options (void) |
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254 { |
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255 clear_options (&user_options); |
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256 } |
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257 |
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258 /* Empty the saved file options vector. */ |
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259 |
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260 void |
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261 lto_clear_file_options (void) |
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262 { |
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263 clear_options (&file_options); |
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264 } |
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265 |
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266 /* Concatenate the user options and any file options read from an LTO IL |
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267 file, and serialize them to STREAM. File options precede user options |
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268 so that the latter override the former when reissued. */ |
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269 |
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270 static void |
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271 output_options (struct lto_output_stream *stream) |
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272 { |
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273 VEC(opt_t, heap) *opts = concatenate_options (file_options, user_options); |
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274 const size_t length = VEC_length (opt_t, opts); |
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275 int i; |
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276 opt_t *o; |
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277 |
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278 output_data_stream (stream, &length, sizeof (length)); |
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279 |
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280 for (i = 0; VEC_iterate (opt_t, opts, i, o); i++) |
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281 { |
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282 output_data_stream (stream, &o->type, sizeof (o->type)); |
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283 output_data_stream (stream, &o->code, sizeof (o->code)); |
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284 output_string_stream (stream, o->arg); |
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285 output_data_stream (stream, &o->value, sizeof (o->value)); |
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286 } |
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287 |
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288 VEC_free (opt_t, heap, opts); |
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289 } |
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290 |
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291 /* Write currently held options to an LTO IL section. */ |
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292 |
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293 void |
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294 lto_write_options (void) |
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295 { |
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296 char *const section_name = lto_get_section_name (LTO_section_opts, NULL); |
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297 struct lto_output_stream stream; |
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298 struct lto_simple_header header; |
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299 struct lto_output_stream *header_stream; |
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300 |
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301 lto_begin_section (section_name, !flag_wpa); |
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302 free (section_name); |
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303 |
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304 memset (&stream, 0, sizeof (stream)); |
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305 output_options (&stream); |
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306 |
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307 memset (&header, 0, sizeof (header)); |
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308 header.lto_header.major_version = LTO_major_version; |
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309 header.lto_header.minor_version = LTO_minor_version; |
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310 header.lto_header.section_type = LTO_section_opts; |
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311 |
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312 header.compressed_size = 0; |
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313 header.main_size = stream.total_size; |
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314 |
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315 header_stream = ((struct lto_output_stream *) |
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316 xcalloc (1, sizeof (*header_stream))); |
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317 lto_output_data_stream (header_stream, &header, sizeof (header)); |
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318 lto_write_stream (header_stream); |
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319 free (header_stream); |
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320 |
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321 lto_write_stream (&stream); |
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322 lto_end_section (); |
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323 } |
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324 |
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325 /* Unserialize an options vector from IB, and append to file_options. */ |
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326 |
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327 static void |
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328 input_options (struct lto_input_block *ib) |
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329 { |
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330 size_t length, i; |
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331 |
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332 input_data_block (ib, &length, sizeof (length)); |
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333 |
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334 for (i = 0; i < length; i++) |
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335 { |
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336 opt_t o; |
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337 |
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338 input_data_block (ib, &o.type, sizeof (o.type)); |
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339 input_data_block (ib, &o.code, sizeof (o.code)); |
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340 o.arg = input_string_block (ib); |
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341 input_data_block (ib, &o.value, sizeof (o.value)); |
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342 VEC_safe_push (opt_t, heap, file_options, &o); |
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343 } |
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344 } |
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345 |
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346 /* Read options from an LTO IL section. */ |
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347 |
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348 void |
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349 lto_read_file_options (struct lto_file_decl_data *file_data) |
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350 { |
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351 size_t len; |
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352 const char *data; |
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353 const struct lto_simple_header *header; |
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354 int32_t opts_offset; |
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355 struct lto_input_block ib; |
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356 |
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357 data = lto_get_section_data (file_data, LTO_section_opts, NULL, &len); |
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358 header = (const struct lto_simple_header *) data; |
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359 opts_offset = sizeof (*header); |
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360 |
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361 lto_check_version (header->lto_header.major_version, |
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362 header->lto_header.minor_version); |
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363 |
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364 LTO_INIT_INPUT_BLOCK (ib, data + opts_offset, 0, header->main_size); |
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365 input_options (&ib); |
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366 |
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367 lto_free_section_data (file_data, LTO_section_opts, 0, data, len); |
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368 } |
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369 |
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370 /* Concatenate the user options and any file options read from an LTO IL |
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371 file, and reissue them as if all had just been read in from the command |
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372 line. As with serialization, file options precede user options. */ |
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373 |
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374 void |
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375 lto_reissue_options (void) |
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376 { |
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377 VEC(opt_t, heap) *opts = concatenate_options (file_options, user_options); |
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378 int i; |
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379 opt_t *o; |
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380 |
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381 for (i = 0; VEC_iterate (opt_t, opts, i, o); i++) |
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382 { |
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383 const struct cl_option *option = &cl_options[o->code]; |
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384 |
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385 if (option->flag_var) |
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386 set_option (option, o->value, o->arg); |
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387 |
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388 if (o->type == CL_TARGET) |
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389 targetm.handle_option (o->code, o->arg, o->value); |
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390 else if (o->type == CL_COMMON) |
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391 gcc_assert (option->flag_var); |
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392 else |
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393 gcc_unreachable (); |
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394 } |
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395 |
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396 VEC_free (opt_t, heap, opts); |
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397 } |