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annotate lib/Archive/Archive.cpp @ 15:66597e792247

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minor fix
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 17 Sep 2013 21:32:34 +0900
parents 9ad51c7bc036
children
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1 //===-- Archive.cpp - Generic LLVM archive functions ------------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file contains the implementation of the Archive and ArchiveMember
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11 // classes that is common to both reading and writing archives..
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #include "llvm/Bitcode/Archive.h"
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16 #include "ArchiveInternals.h"
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17 #include "llvm/Bitcode/ReaderWriter.h"
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18 #include "llvm/IR/Module.h"
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19 #include "llvm/Support/FileSystem.h"
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20 #include "llvm/Support/MemoryBuffer.h"
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21 #include "llvm/Support/Process.h"
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22 #include "llvm/Support/system_error.h"
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23 #include <cstring>
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24 #include <memory>
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25 using namespace llvm;
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26
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27 // getMemberSize - compute the actual physical size of the file member as seen
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28 // on disk. This isn't the size of member's payload. Use getSize() for that.
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29 unsigned
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30 ArchiveMember::getMemberSize() const {
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31 // Basically its the file size plus the header size
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32 unsigned result = info.fileSize + sizeof(ArchiveMemberHeader);
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33
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34 // If it has a long filename, include the name length
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35 if (hasLongFilename())
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36 result += path.str().length() + 1;
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37
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38 // If its now odd lengthed, include the padding byte
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39 if (result % 2 != 0 )
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40 result++;
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41
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42 return result;
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43 }
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44
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45 // This default constructor is only use by the ilist when it creates its
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46 // sentry node. We give it specific static values to make it stand out a bit.
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47 ArchiveMember::ArchiveMember()
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48 : parent(0), path("--invalid--"), flags(0), data(0)
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49 {
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50 info.user = sys::Process::GetCurrentUserId();
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51 info.group = sys::Process::GetCurrentGroupId();
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52 info.mode = 0777;
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53 info.fileSize = 0;
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54 info.modTime = sys::TimeValue::now();
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55 }
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56
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57 // This is the constructor that the Archive class uses when it is building or
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58 // reading an archive. It just defaults a few things and ensures the parent is
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59 // set for the iplist. The Archive class fills in the ArchiveMember's data.
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60 // This is required because correctly setting the data may depend on other
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61 // things in the Archive.
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62 ArchiveMember::ArchiveMember(Archive* PAR)
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63 : parent(PAR), path(), flags(0), data(0)
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64 {
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65 }
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66
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67 // This method allows an ArchiveMember to be replaced with the data for a
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68 // different file, presumably as an update to the member. It also makes sure
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69 // the flags are reset correctly.
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70 bool ArchiveMember::replaceWith(const sys::Path& newFile, std::string* ErrMsg) {
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71 bool Exists;
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72 if (sys::fs::exists(newFile.str(), Exists) || !Exists) {
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73 if (ErrMsg)
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74 *ErrMsg = "Can not replace an archive member with a non-existent file";
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75 return true;
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76 }
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77
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78 data = 0;
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79 path = newFile;
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80
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81 // SVR4 symbol tables have an empty name
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82 if (path.str() == ARFILE_SVR4_SYMTAB_NAME)
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83 flags |= SVR4SymbolTableFlag;
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84 else
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85 flags &= ~SVR4SymbolTableFlag;
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86
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87 // BSD4.4 symbol tables have a special name
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88 if (path.str() == ARFILE_BSD4_SYMTAB_NAME)
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89 flags |= BSD4SymbolTableFlag;
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90 else
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91 flags &= ~BSD4SymbolTableFlag;
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92
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93 // LLVM symbol tables have a very specific name
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94 if (path.str() == ARFILE_LLVM_SYMTAB_NAME)
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95 flags |= LLVMSymbolTableFlag;
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96 else
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97 flags &= ~LLVMSymbolTableFlag;
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98
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99 // String table name
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100 if (path.str() == ARFILE_STRTAB_NAME)
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101 flags |= StringTableFlag;
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102 else
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103 flags &= ~StringTableFlag;
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104
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105 // If it has a slash then it has a path
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106 bool hasSlash = path.str().find('/') != std::string::npos;
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107 if (hasSlash)
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108 flags |= HasPathFlag;
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109 else
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110 flags &= ~HasPathFlag;
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111
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112 // If it has a slash or its over 15 chars then its a long filename format
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113 if (hasSlash || path.str().length() > 15)
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114 flags |= HasLongFilenameFlag;
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115 else
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116 flags &= ~HasLongFilenameFlag;
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117
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118 // Get the signature and status info
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119 const char* signature = (const char*) data;
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120 SmallString<4> magic;
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121 if (!signature) {
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122 sys::fs::get_magic(path.str(), magic.capacity(), magic);
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123 signature = magic.c_str();
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124 const sys::FileStatus *FSinfo = path.getFileStatus(false, ErrMsg);
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125 if (FSinfo)
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126 info = *FSinfo;
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127 else
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128 return true;
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129 }
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130
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131 // Determine what kind of file it is.
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132 switch (sys::IdentifyFileType(signature,4)) {
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133 case sys::Bitcode_FileType:
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134 flags |= BitcodeFlag;
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135 break;
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136 default:
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137 flags &= ~BitcodeFlag;
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138 break;
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139 }
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140 return false;
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141 }
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142
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143 // Archive constructor - this is the only constructor that gets used for the
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144 // Archive class. Everything else (default,copy) is deprecated. This just
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145 // initializes and maps the file into memory, if requested.
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146 Archive::Archive(const sys::Path& filename, LLVMContext& C)
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147 : archPath(filename), members(), mapfile(0), base(0), symTab(), strtab(),
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148 symTabSize(0), firstFileOffset(0), modules(), foreignST(0), Context(C) {
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149 }
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150
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151 bool
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152 Archive::mapToMemory(std::string* ErrMsg) {
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153 OwningPtr<MemoryBuffer> File;
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154 if (error_code ec = MemoryBuffer::getFile(archPath.c_str(), File)) {
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155 if (ErrMsg)
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156 *ErrMsg = ec.message();
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157 return true;
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158 }
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159 mapfile = File.take();
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160 base = mapfile->getBufferStart();
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161 return false;
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162 }
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163
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164 void Archive::cleanUpMemory() {
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165 // Shutdown the file mapping
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166 delete mapfile;
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167 mapfile = 0;
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168 base = 0;
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169
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170 // Forget the entire symbol table
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171 symTab.clear();
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172 symTabSize = 0;
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173
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174 firstFileOffset = 0;
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175
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176 // Free the foreign symbol table member
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177 if (foreignST) {
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178 delete foreignST;
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179 foreignST = 0;
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180 }
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181
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182 // Delete any Modules and ArchiveMember's we've allocated as a result of
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183 // symbol table searches.
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184 for (ModuleMap::iterator I=modules.begin(), E=modules.end(); I != E; ++I ) {
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185 delete I->second.first;
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186 delete I->second.second;
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187 }
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188 }
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189
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190 // Archive destructor - just clean up memory
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191 Archive::~Archive() {
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192 cleanUpMemory();
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193 }
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194
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195
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196
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197 static void getSymbols(Module*M, std::vector<std::string>& symbols) {
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198 // Loop over global variables
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199 for (Module::global_iterator GI = M->global_begin(), GE=M->global_end(); GI != GE; ++GI)
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200 if (!GI->isDeclaration() && !GI->hasLocalLinkage())
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diff changeset
201 if (!GI->getName().empty())
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202 symbols.push_back(GI->getName());
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203
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204 // Loop over functions
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205 for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI)
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206 if (!FI->isDeclaration() && !FI->hasLocalLinkage())
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diff changeset
207 if (!FI->getName().empty())
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208 symbols.push_back(FI->getName());
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209
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210 // Loop over aliases
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211 for (Module::alias_iterator AI = M->alias_begin(), AE = M->alias_end();
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parents:
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212 AI != AE; ++AI) {
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diff changeset
213 if (AI->hasName())
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diff changeset
214 symbols.push_back(AI->getName());
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215 }
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216 }
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217
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218 // Get just the externally visible defined symbols from the bitcode
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219 bool llvm::GetBitcodeSymbols(const sys::Path& fName,
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220 LLVMContext& Context,
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221 std::vector<std::string>& symbols,
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222 std::string* ErrMsg) {
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223 OwningPtr<MemoryBuffer> Buffer;
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parents:
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224 if (error_code ec = MemoryBuffer::getFileOrSTDIN(fName.c_str(), Buffer)) {
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parents:
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225 if (ErrMsg) *ErrMsg = "Could not open file '" + fName.str() + "'" + ": "
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226 + ec.message();
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227 return true;
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228 }
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229
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230 Module *M = ParseBitcodeFile(Buffer.get(), Context, ErrMsg);
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231 if (!M)
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232 return true;
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233
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234 // Get the symbols
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235 getSymbols(M, symbols);
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236
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237 // Done with the module.
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238 delete M;
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239 return true;
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240 }
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241
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242 Module*
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243 llvm::GetBitcodeSymbols(const char *BufPtr, unsigned Length,
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244 const std::string& ModuleID,
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245 LLVMContext& Context,
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246 std::vector<std::string>& symbols,
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247 std::string* ErrMsg) {
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248 // Get the module.
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249 OwningPtr<MemoryBuffer> Buffer(
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250 MemoryBuffer::getMemBufferCopy(StringRef(BufPtr, Length),ModuleID.c_str()));
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251
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252 Module *M = ParseBitcodeFile(Buffer.get(), Context, ErrMsg);
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253 if (!M)
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254 return 0;
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255
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256 // Get the symbols
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257 getSymbols(M, symbols);
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258
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259 // Done with the module. Note that it's the caller's responsibility to delete
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260 // the Module.
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261 return M;
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262 }