1 //===-- BinaryHolder.cpp --------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This program is a utility that aims to be a dropin replacement for 11 // Darwin's dsymutil. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "BinaryHolder.h" 16 #include "llvm/Support/raw_ostream.h" 17 18 namespace llvm { 19 namespace dsymutil { 20 21 ErrorOr<MemoryBufferRef> 22 BinaryHolder::GetMemoryBufferForFile(StringRef Filename) { 23 if (Verbose) 24 outs() << "trying to open '" << Filename << "'\n"; 25 26 // Try that first as it doesn't involve any filesystem access. 27 if (auto ErrOrArchiveMember = GetArchiveMemberBuffer(Filename)) 28 return *ErrOrArchiveMember; 29 30 // If the name ends with a closing paren, there is a huge chance 31 // it is an archive member specification. 32 if (Filename.endswith(")")) 33 if (auto ErrOrArchiveMember = MapArchiveAndGetMemberBuffer(Filename)) 34 return *ErrOrArchiveMember; 35 36 // Otherwise, just try opening a standard file. If this is an 37 // archive member specifiaction and any of the above didn't handle it 38 // (either because the archive is not there anymore, or because the 39 // archive doesn't contain the requested member), this will still 40 // provide a sensible error message. 41 auto ErrOrFile = MemoryBuffer::getFileOrSTDIN(Filename); 42 if (auto Err = ErrOrFile.getError()) 43 return Err; 44 45 if (Verbose) 46 outs() << "\tloaded file.\n"; 47 CurrentArchive.reset(); 48 CurrentMemoryBuffer = std::move(ErrOrFile.get()); 49 return CurrentMemoryBuffer->getMemBufferRef(); 50 } 51 52 ErrorOr<MemoryBufferRef> 53 BinaryHolder::GetArchiveMemberBuffer(StringRef Filename) { 54 if (!CurrentArchive) 55 return make_error_code(errc::no_such_file_or_directory); 56 57 StringRef CurArchiveName = CurrentArchive->getFileName(); 58 if (!Filename.startswith(Twine(CurArchiveName, "(").str())) 59 return make_error_code(errc::no_such_file_or_directory); 60 61 // Remove the archive name and the parens around the archive member name. 62 Filename = Filename.substr(CurArchiveName.size() + 1).drop_back(); 63 64 for (const auto &Child : CurrentArchive->children()) { 65 if (auto NameOrErr = Child.getName()) 66 if (*NameOrErr == Filename) { 67 if (Verbose) 68 outs() << "\tfound member in current archive.\n"; 69 return Child.getMemoryBufferRef(); 70 } 71 } 72 73 return make_error_code(errc::no_such_file_or_directory); 74 } 75 76 ErrorOr<MemoryBufferRef> 77 BinaryHolder::MapArchiveAndGetMemberBuffer(StringRef Filename) { 78 StringRef ArchiveFilename = Filename.substr(0, Filename.find('(')); 79 80 auto ErrOrBuff = MemoryBuffer::getFileOrSTDIN(ArchiveFilename); 81 if (auto Err = ErrOrBuff.getError()) 82 return Err; 83 84 if (Verbose) 85 outs() << "\topened new archive '" << ArchiveFilename << "'\n"; 86 auto ErrOrArchive = object::Archive::create((*ErrOrBuff)->getMemBufferRef()); 87 if (auto Err = ErrOrArchive.getError()) 88 return Err; 89 90 CurrentArchive = std::move(*ErrOrArchive); 91 CurrentMemoryBuffer = std::move(*ErrOrBuff); 92 93 return GetArchiveMemberBuffer(Filename); 94 } 95 96 ErrorOr<const object::ObjectFile &> 97 BinaryHolder::GetObjectFile(StringRef Filename) { 98 auto ErrOrMemBufferRef = GetMemoryBufferForFile(Filename); 99 if (auto Err = ErrOrMemBufferRef.getError()) 100 return Err; 101 102 auto ErrOrObjectFile = 103 object::ObjectFile::createObjectFile(*ErrOrMemBufferRef); 104 if (auto Err = ErrOrObjectFile.getError()) 105 return Err; 106 107 CurrentObjectFile = std::move(*ErrOrObjectFile); 108 return *CurrentObjectFile; 109 } 110 } 111 } 112
