Mercurial > hg > CbC > CbC_gcc
annotate gcc/lto-section-in.c @ 63:b7f97abdc517 gcc-4.6-20100522
update gcc from gcc-4.5.0 to gcc-4.6
author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
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date | Mon, 24 May 2010 12:47:05 +0900 |
parents | 77e2b8dfacca |
children | f6334be47118 |
rev | line source |
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1 /* Input functions for reading LTO sections. |
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2 |
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3 Copyright 2009 Free Software Foundation, Inc. |
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4 Contributed by Kenneth Zadeck <zadeck@naturalbridge.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 "tm.h" |
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26 #include "toplev.h" |
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27 #include "tree.h" |
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28 #include "expr.h" |
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29 #include "flags.h" |
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30 #include "params.h" |
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31 #include "input.h" |
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32 #include "hashtab.h" |
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33 #include "basic-block.h" |
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34 #include "tree-flow.h" |
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35 #include "cgraph.h" |
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36 #include "function.h" |
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37 #include "ggc.h" |
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38 #include "diagnostic.h" |
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39 #include "except.h" |
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40 #include "vec.h" |
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41 #include "timevar.h" |
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42 #include "output.h" |
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43 #include "lto-streamer.h" |
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44 #include "lto-compress.h" |
63
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45 #include "ggc.h" |
55
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46 |
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47 /* Section names. These must correspond to the values of |
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48 enum lto_section_type. */ |
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49 const char *lto_section_name[LTO_N_SECTION_TYPES] = |
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50 { |
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51 "decls", |
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52 "function_body", |
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53 "static_initializer", |
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54 "cgraph", |
63
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55 "varpool", |
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56 "refs", |
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57 "jump_funcs" |
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58 "ipa_pure_const", |
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59 "ipa_reference", |
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60 "symtab", |
63
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61 "opts", |
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62 "cgraphopt" |
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63 }; |
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64 |
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65 unsigned char |
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66 lto_input_1_unsigned (struct lto_input_block *ib) |
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67 { |
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68 if (ib->p >= ib->len) |
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69 internal_error ("bytecode stream: trying to read %d bytes " |
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70 "after the end of the input buffer", ib->p - ib->len); |
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71 |
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72 return (ib->data[ib->p++]); |
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73 } |
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74 |
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75 |
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76 /* Read an ULEB128 Number of IB. */ |
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77 |
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78 unsigned HOST_WIDE_INT |
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79 lto_input_uleb128 (struct lto_input_block *ib) |
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80 { |
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81 unsigned HOST_WIDE_INT result = 0; |
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82 int shift = 0; |
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83 unsigned HOST_WIDE_INT byte; |
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84 |
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85 while (true) |
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86 { |
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87 byte = lto_input_1_unsigned (ib); |
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88 result |= (byte & 0x7f) << shift; |
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89 shift += 7; |
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90 if ((byte & 0x80) == 0) |
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91 return result; |
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92 } |
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93 } |
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94 |
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95 /* HOST_WIDEST_INT version of lto_input_uleb128. IB is as in |
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96 lto_input_uleb128. */ |
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97 |
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98 unsigned HOST_WIDEST_INT |
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99 lto_input_widest_uint_uleb128 (struct lto_input_block *ib) |
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100 { |
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101 unsigned HOST_WIDEST_INT result = 0; |
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102 int shift = 0; |
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103 unsigned HOST_WIDEST_INT byte; |
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104 |
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105 while (true) |
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106 { |
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107 byte = lto_input_1_unsigned (ib); |
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108 result |= (byte & 0x7f) << shift; |
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109 shift += 7; |
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110 if ((byte & 0x80) == 0) |
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111 return result; |
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112 } |
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113 } |
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114 |
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115 /* Read an SLEB128 Number of IB. */ |
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116 |
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117 HOST_WIDE_INT |
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118 lto_input_sleb128 (struct lto_input_block *ib) |
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119 { |
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120 HOST_WIDE_INT result = 0; |
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121 int shift = 0; |
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122 unsigned HOST_WIDE_INT byte; |
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123 |
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124 while (true) |
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125 { |
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126 byte = lto_input_1_unsigned (ib); |
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127 result |= (byte & 0x7f) << shift; |
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128 shift += 7; |
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129 if ((byte & 0x80) == 0) |
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130 { |
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131 if ((shift < HOST_BITS_PER_WIDE_INT) && (byte & 0x40)) |
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132 result |= - ((HOST_WIDE_INT)1 << shift); |
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133 |
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134 return result; |
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135 } |
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136 } |
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137 } |
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138 |
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139 |
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140 /* Hooks so that the ipa passes can call into the lto front end to get |
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141 sections. */ |
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142 |
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143 static struct lto_file_decl_data ** file_decl_data; |
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144 static lto_get_section_data_f* get_section_f; |
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145 static lto_free_section_data_f* free_section_f; |
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146 |
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147 |
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148 /* This is called from the lto front end to set up the hooks that are |
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149 used by the ipa passes to get the data that they will |
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150 deserialize. */ |
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151 |
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152 void |
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153 lto_set_in_hooks (struct lto_file_decl_data ** data, |
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154 lto_get_section_data_f* get_f, |
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155 lto_free_section_data_f* free_f) |
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156 { |
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157 file_decl_data = data; |
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158 get_section_f = get_f; |
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159 free_section_f = free_f; |
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160 } |
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161 |
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162 |
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163 /* Return an array of file decl datas for all of the files passed to |
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164 this compilation. */ |
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165 |
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166 struct lto_file_decl_data ** |
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167 lto_get_file_decl_data (void) |
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168 { |
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169 gcc_assert (file_decl_data); |
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170 return file_decl_data; |
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171 } |
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172 |
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173 /* Buffer structure for accumulating data from compression callbacks. */ |
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174 |
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175 struct lto_buffer |
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176 { |
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177 char *data; |
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178 size_t length; |
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179 }; |
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180 |
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181 /* Compression callback, append LENGTH bytes from DATA to the buffer pointed |
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182 to by OPAQUE. */ |
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183 |
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184 static void |
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185 lto_append_data (const char *data, unsigned length, void *opaque) |
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186 { |
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187 struct lto_buffer *buffer = (struct lto_buffer *) opaque; |
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188 |
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189 buffer->data = (char *) xrealloc (buffer->data, buffer->length + length); |
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190 memcpy (buffer->data + buffer->length, data, length); |
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191 buffer->length += length; |
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192 } |
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193 |
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194 /* Header placed in returned uncompressed data streams. Allows the |
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195 uncompressed allocated data to be mapped back to the underlying |
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196 compressed data for use with free_section_f. */ |
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197 |
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198 struct lto_data_header |
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199 { |
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200 const char *data; |
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201 size_t len; |
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202 }; |
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203 |
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204 /* Return a char pointer to the start of a data stream for an LTO pass |
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205 or function. FILE_DATA indicates where to obtain the data. |
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206 SECTION_TYPE is the type of information to be obtained. NAME is |
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207 the name of the function and is only used when finding a function |
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208 body; otherwise it is NULL. LEN is the size of the data |
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209 returned. */ |
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210 |
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211 const char * |
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212 lto_get_section_data (struct lto_file_decl_data *file_data, |
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213 enum lto_section_type section_type, |
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214 const char *name, |
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215 size_t *len) |
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216 { |
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217 const char *data = (get_section_f) (file_data, section_type, name, len); |
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218 const size_t header_length = sizeof (struct lto_data_header); |
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219 struct lto_data_header *header; |
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220 struct lto_buffer buffer; |
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221 struct lto_compression_stream *stream; |
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222 lto_stats.section_size[section_type] += *len; |
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223 |
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224 if (data == NULL) |
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225 return NULL; |
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226 |
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227 /* FIXME lto: WPA mode does not write compressed sections, so for now |
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228 suppress uncompression if flag_ltrans. */ |
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229 if (flag_ltrans) |
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230 return data; |
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231 |
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232 /* Create a mapping header containing the underlying data and length, |
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233 and prepend this to the uncompression buffer. The uncompressed data |
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234 then follows, and a pointer to the start of the uncompressed data is |
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235 returned. */ |
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236 header = (struct lto_data_header *) xmalloc (header_length); |
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237 header->data = data; |
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238 header->len = *len; |
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239 |
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240 buffer.data = (char *) header; |
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241 buffer.length = header_length; |
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242 |
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243 stream = lto_start_uncompression (lto_append_data, &buffer); |
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244 lto_uncompress_block (stream, data, *len); |
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245 lto_end_uncompression (stream); |
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246 |
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247 *len = buffer.length - header_length; |
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248 return buffer.data + header_length; |
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249 } |
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250 |
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251 |
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252 /* Free the data found from the above call. The first three |
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253 parameters are the same as above. DATA is the data to be freed and |
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254 LEN is the length of that data. */ |
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255 |
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256 void |
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257 lto_free_section_data (struct lto_file_decl_data *file_data, |
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258 enum lto_section_type section_type, |
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259 const char *name, |
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260 const char *data, |
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261 size_t len) |
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262 { |
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263 const size_t header_length = sizeof (struct lto_data_header); |
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264 const char *real_data = data - header_length; |
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265 const struct lto_data_header *header |
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266 = (const struct lto_data_header *) real_data; |
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267 |
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268 gcc_assert (free_section_f); |
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269 |
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270 /* FIXME lto: WPA mode does not write compressed sections, so for now |
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271 suppress uncompression mapping if flag_ltrans. */ |
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272 if (flag_ltrans) |
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273 { |
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274 (free_section_f) (file_data, section_type, name, data, len); |
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275 return; |
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276 } |
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277 |
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278 /* The underlying data address has been extracted from the mapping header. |
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279 Free that, then free the allocated uncompression buffer. */ |
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280 (free_section_f) (file_data, section_type, name, header->data, header->len); |
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281 free (CONST_CAST (char *, real_data)); |
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282 } |
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283 |
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284 |
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285 /* Load a section of type SECTION_TYPE from FILE_DATA, parse the |
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286 header and then return an input block pointing to the section. The |
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287 raw pointer to the section is returned in DATAR and LEN. These are |
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288 used to free the section. Return NULL if the section is not present. */ |
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289 |
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290 struct lto_input_block * |
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291 lto_create_simple_input_block (struct lto_file_decl_data *file_data, |
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292 enum lto_section_type section_type, |
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293 const char **datar, size_t *len) |
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294 { |
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295 const char *data = lto_get_section_data (file_data, section_type, NULL, len); |
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296 const struct lto_simple_header * header |
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297 = (const struct lto_simple_header *) data; |
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298 |
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299 struct lto_input_block* ib_main; |
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300 int32_t main_offset = sizeof (struct lto_simple_header); |
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301 |
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302 if (!data) |
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303 return NULL; |
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304 |
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305 ib_main = XNEW (struct lto_input_block); |
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306 |
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307 *datar = data; |
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308 LTO_INIT_INPUT_BLOCK_PTR (ib_main, data + main_offset, |
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309 0, header->main_size); |
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310 |
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311 return ib_main; |
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312 } |
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313 |
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314 |
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315 /* Close the section returned from a call to |
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316 LTO_CREATE_SIMPLE_INPUT_BLOCK. IB is the input block returned from |
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317 that call. The FILE_DATA and SECTION_TYPE are the same as what was |
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318 passed to that call and the DATA and LEN are what was returned from |
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319 that call. */ |
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320 |
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321 void |
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322 lto_destroy_simple_input_block (struct lto_file_decl_data *file_data, |
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323 enum lto_section_type section_type, |
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324 struct lto_input_block *ib, |
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325 const char *data, size_t len) |
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326 { |
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327 free (ib); |
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328 lto_free_section_data (file_data, section_type, NULL, data, len); |
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329 } |
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330 |
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331 /*****************************************************************************/ |
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332 /* Record renamings of static declarations */ |
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333 /*****************************************************************************/ |
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334 |
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335 struct lto_renaming_slot |
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336 { |
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337 const char *old_name; |
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338 const char *new_name; |
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339 }; |
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340 |
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341 /* Returns a hash code for P. */ |
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342 |
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343 static hashval_t |
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344 hash_name (const void *p) |
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345 { |
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346 const struct lto_renaming_slot *ds = (const struct lto_renaming_slot *) p; |
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347 return (hashval_t) htab_hash_string (ds->new_name); |
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348 } |
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349 |
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350 /* Returns nonzero if P1 and P2 are equal. */ |
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351 |
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352 static int |
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353 eq_name (const void *p1, const void *p2) |
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354 { |
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355 const struct lto_renaming_slot *s1 = |
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356 (const struct lto_renaming_slot *) p1; |
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357 const struct lto_renaming_slot *s2 = |
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358 (const struct lto_renaming_slot *) p2; |
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359 |
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360 return strcmp (s1->new_name, s2->new_name) == 0; |
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361 } |
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362 |
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363 /* Free a renaming table entry. */ |
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364 |
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365 static void |
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366 renaming_slot_free (void *slot) |
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367 { |
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368 struct lto_renaming_slot *s = (struct lto_renaming_slot *) slot; |
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369 |
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370 free (CONST_CAST (void *, (const void *) s->old_name)); |
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371 free (CONST_CAST (void *, (const void *) s->new_name)); |
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372 free ((void *) s); |
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373 } |
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374 |
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375 /* Create an empty hash table for recording declaration renamings. */ |
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376 |
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377 htab_t |
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378 lto_create_renaming_table (void) |
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379 { |
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380 return htab_create (37, hash_name, eq_name, renaming_slot_free); |
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381 } |
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382 |
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383 /* Record a declaration name mapping OLD_NAME -> NEW_NAME. DECL_DATA |
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384 holds the renaming hash table to use. */ |
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385 |
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386 void |
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387 lto_record_renamed_decl (struct lto_file_decl_data *decl_data, |
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388 const char *old_name, const char *new_name) |
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389 { |
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390 void **slot; |
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391 struct lto_renaming_slot r_slot; |
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392 |
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393 r_slot.new_name = new_name; |
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394 slot = htab_find_slot (decl_data->renaming_hash_table, &r_slot, INSERT); |
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395 if (*slot == NULL) |
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396 { |
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397 struct lto_renaming_slot *new_slot = XNEW (struct lto_renaming_slot); |
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398 new_slot->old_name = xstrdup (old_name); |
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|
399 new_slot->new_name = xstrdup (new_name); |
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|
400 *slot = new_slot; |
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|
401 } |
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|
402 else |
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|
403 gcc_unreachable (); |
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parents:
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|
404 } |
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|
405 |
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|
406 |
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parents:
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|
407 /* Given a string NAME, return the string that it has been mapped to |
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|
408 by lto_record_renamed_decl. If NAME was not renamed, it is |
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|
409 returned unchanged. DECL_DATA holds the renaming hash table to use. */ |
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|
410 |
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parents:
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changeset
|
411 const char * |
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|
412 lto_get_decl_name_mapping (struct lto_file_decl_data *decl_data, |
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parents:
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|
413 const char *name) |
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parents:
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changeset
|
414 { |
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parents:
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|
415 htab_t renaming_hash_table = decl_data->renaming_hash_table; |
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changeset
|
416 struct lto_renaming_slot *slot; |
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|
417 struct lto_renaming_slot r_slot; |
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parents:
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|
418 |
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|
419 r_slot.new_name = name; |
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|
420 slot = (struct lto_renaming_slot *) htab_find (renaming_hash_table, &r_slot); |
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parents:
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changeset
|
421 if (slot) |
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|
422 return slot->old_name; |
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|
423 else |
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parents:
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|
424 return name; |
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parents:
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|
425 } |
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parents:
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|
426 |
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|
427 /*****************************************************************************/ |
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|
428 /* Input decl state object. */ |
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|
429 /*****************************************************************************/ |
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|
430 |
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parents:
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|
431 /* Return a newly created in-decl state object. */ |
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|
432 |
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|
433 struct lto_in_decl_state * |
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parents:
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|
434 lto_new_in_decl_state (void) |
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parents:
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|
435 { |
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parents:
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|
436 struct lto_in_decl_state *state; |
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parents:
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|
437 |
63
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55
diff
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|
438 state = ((struct lto_in_decl_state *) ggc_alloc (sizeof (*state))); |
55
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parents:
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changeset
|
439 memset (state, 0, sizeof (*state)); |
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parents:
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|
440 return state; |
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parents:
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changeset
|
441 } |
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parents:
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changeset
|
442 |
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parents:
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changeset
|
443 /* Delete STATE and its components. */ |
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parents:
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changeset
|
444 |
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parents:
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changeset
|
445 void |
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parents:
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changeset
|
446 lto_delete_in_decl_state (struct lto_in_decl_state *state) |
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parents:
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changeset
|
447 { |
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448 int i; |
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449 |
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450 for (i = 0; i < LTO_N_DECL_STREAMS; i++) |
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451 if (state->streams[i].trees) |
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452 ggc_free (state->streams[i].trees); |
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453 ggc_free (state); |
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454 } |
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455 |
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456 /* Hashtable helpers. lto_in_decl_states are hash by their function decls. */ |
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457 |
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458 hashval_t |
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459 lto_hash_in_decl_state (const void *p) |
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460 { |
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461 const struct lto_in_decl_state *state = (const struct lto_in_decl_state *) p; |
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462 return htab_hash_pointer (state->fn_decl); |
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463 } |
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464 |
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465 /* Return true if the fn_decl field of the lto_in_decl_state pointed to by |
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466 P1 equals to the function decl P2. */ |
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467 |
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468 int |
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469 lto_eq_in_decl_state (const void *p1, const void *p2) |
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470 { |
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471 const struct lto_in_decl_state *state1 = |
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472 (const struct lto_in_decl_state *) p1; |
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473 const struct lto_in_decl_state *state2 = |
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474 (const struct lto_in_decl_state *) p2; |
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475 return state1->fn_decl == state2->fn_decl; |
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476 } |
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477 |
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478 |
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479 /* Search the in-decl state of a function FUNC contained in the file |
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480 associated with FILE_DATA. Return NULL if not found. */ |
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481 |
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482 struct lto_in_decl_state* |
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483 lto_get_function_in_decl_state (struct lto_file_decl_data *file_data, |
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484 tree func) |
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485 { |
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486 struct lto_in_decl_state temp; |
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487 void **slot; |
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488 |
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489 temp.fn_decl = func; |
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490 slot = htab_find_slot (file_data->function_decl_states, &temp, NO_INSERT); |
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491 return slot? ((struct lto_in_decl_state*) *slot) : NULL; |
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492 } |