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Diffstat (limited to 'tools/llvm-ar/Archive.cpp')
| -rw-r--r-- | tools/llvm-ar/Archive.cpp | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/tools/llvm-ar/Archive.cpp b/tools/llvm-ar/Archive.cpp new file mode 100644 index 00000000000..3e9b9b2c253 --- /dev/null +++ b/tools/llvm-ar/Archive.cpp @@ -0,0 +1,254 @@ +//===-- Archive.cpp - Generic LLVM archive functions ------------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file contains the implementation of the Archive and ArchiveMember +// classes that is common to both reading and writing archives.. +// +//===----------------------------------------------------------------------===// + +#include "Archive.h" +#include "ArchiveInternals.h" +#include "llvm/Bitcode/ReaderWriter.h" +#include "llvm/IR/Module.h" +#include "llvm/Support/FileSystem.h" +#include "llvm/Support/MemoryBuffer.h" +#include "llvm/Support/Process.h" +#include "llvm/Support/system_error.h" +#include <cstring> +#include <memory> +using namespace llvm; + +// getMemberSize - compute the actual physical size of the file member as seen +// on disk. This isn't the size of member's payload. Use getSize() for that. +unsigned +ArchiveMember::getMemberSize() const { + // Basically its the file size plus the header size + unsigned result = info.fileSize + sizeof(ArchiveMemberHeader); + + // If it has a long filename, include the name length + if (hasLongFilename()) + result += path.str().length() + 1; + + // If its now odd lengthed, include the padding byte + if (result % 2 != 0 ) + result++; + + return result; +} + +// This default constructor is only use by the ilist when it creates its +// sentry node. We give it specific static values to make it stand out a bit. +ArchiveMember::ArchiveMember() + : parent(0), path("--invalid--"), flags(0), data(0) +{ + info.user = sys::Process::GetCurrentUserId(); + info.group = sys::Process::GetCurrentGroupId(); + info.mode = 0777; + info.fileSize = 0; + info.modTime = sys::TimeValue::now(); +} + +// This is the constructor that the Archive class uses when it is building or +// reading an archive. It just defaults a few things and ensures the parent is +// set for the iplist. The Archive class fills in the ArchiveMember's data. +// This is required because correctly setting the data may depend on other +// things in the Archive. +ArchiveMember::ArchiveMember(Archive* PAR) + : parent(PAR), path(), flags(0), data(0) +{ +} + +// This method allows an ArchiveMember to be replaced with the data for a +// different file, presumably as an update to the member. It also makes sure +// the flags are reset correctly. +bool ArchiveMember::replaceWith(const sys::Path& newFile, std::string* ErrMsg) { + bool Exists; + if (sys::fs::exists(newFile.str(), Exists) || !Exists) { + if (ErrMsg) + *ErrMsg = "Can not replace an archive member with a non-existent file"; + return true; + } + + data = 0; + path = newFile; + + // SVR4 symbol tables have an empty name + if (path.str() == ARFILE_SVR4_SYMTAB_NAME) + flags |= SVR4SymbolTableFlag; + else + flags &= ~SVR4SymbolTableFlag; + + // BSD4.4 symbol tables have a special name + if (path.str() == ARFILE_BSD4_SYMTAB_NAME) + flags |= BSD4SymbolTableFlag; + else + flags &= ~BSD4SymbolTableFlag; + + // String table name + if (path.str() == ARFILE_STRTAB_NAME) + flags |= StringTableFlag; + else + flags &= ~StringTableFlag; + + // If it has a slash then it has a path + bool hasSlash = path.str().find('/') != std::string::npos; + if (hasSlash) + flags |= HasPathFlag; + else + flags &= ~HasPathFlag; + + // If it has a slash or its over 15 chars then its a long filename format + if (hasSlash || path.str().length() > 15) + flags |= HasLongFilenameFlag; + else + flags &= ~HasLongFilenameFlag; + + // Get the signature and status info + const char* signature = (const char*) data; + SmallString<4> magic; + if (!signature) { + sys::fs::get_magic(path.str(), magic.capacity(), magic); + signature = magic.c_str(); + const sys::FileStatus *FSinfo = path.getFileStatus(false, ErrMsg); + if (FSinfo) + info = *FSinfo; + else + return true; + } + + // Determine what kind of file it is. + if (sys::fs::identify_magic(StringRef(signature, 4)) == + sys::fs::file_magic::bitcode) + flags |= BitcodeFlag; + else + flags &= ~BitcodeFlag; + + return false; +} + +// Archive constructor - this is the only constructor that gets used for the +// Archive class. Everything else (default,copy) is deprecated. This just +// initializes and maps the file into memory, if requested. +Archive::Archive(const sys::Path& filename, LLVMContext& C) + : archPath(filename), members(), mapfile(0), base(0), symTab(), strtab(), + symTabSize(0), firstFileOffset(0), modules(), foreignST(0), Context(C) { +} + +bool +Archive::mapToMemory(std::string* ErrMsg) { + OwningPtr<MemoryBuffer> File; + if (error_code ec = MemoryBuffer::getFile(archPath.c_str(), File)) { + if (ErrMsg) + *ErrMsg = ec.message(); + return true; + } + mapfile = File.take(); + base = mapfile->getBufferStart(); + return false; +} + +void Archive::cleanUpMemory() { + // Shutdown the file mapping + delete mapfile; + mapfile = 0; + base = 0; + + // Forget the entire symbol table + symTab.clear(); + symTabSize = 0; + + firstFileOffset = 0; + + // Free the foreign symbol table member + if (foreignST) { + delete foreignST; + foreignST = 0; + } + + // Delete any Modules and ArchiveMember's we've allocated as a result of + // symbol table searches. + for (ModuleMap::iterator I=modules.begin(), E=modules.end(); I != E; ++I ) { + delete I->second.first; + delete I->second.second; + } +} + +// Archive destructor - just clean up memory +Archive::~Archive() { + cleanUpMemory(); +} + + + +static void getSymbols(Module*M, std::vector<std::string>& symbols) { + // Loop over global variables + for (Module::global_iterator GI = M->global_begin(), GE=M->global_end(); GI != GE; ++GI) + if (!GI->isDeclaration() && !GI->hasLocalLinkage()) + if (!GI->getName().empty()) + symbols.push_back(GI->getName()); + + // Loop over functions + for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI) + if (!FI->isDeclaration() && !FI->hasLocalLinkage()) + if (!FI->getName().empty()) + symbols.push_back(FI->getName()); + + // Loop over aliases + for (Module::alias_iterator AI = M->alias_begin(), AE = M->alias_end(); + AI != AE; ++AI) { + if (AI->hasName()) + symbols.push_back(AI->getName()); + } +} + +// Get just the externally visible defined symbols from the bitcode +bool llvm::GetBitcodeSymbols(const sys::Path& fName, + LLVMContext& Context, + std::vector<std::string>& symbols, + std::string* ErrMsg) { + OwningPtr<MemoryBuffer> Buffer; + if (error_code ec = MemoryBuffer::getFileOrSTDIN(fName.c_str(), Buffer)) { + if (ErrMsg) *ErrMsg = "Could not open file '" + fName.str() + "'" + ": " + + ec.message(); + return true; + } + + Module *M = ParseBitcodeFile(Buffer.get(), Context, ErrMsg); + if (!M) + return true; + + // Get the symbols + getSymbols(M, symbols); + + // Done with the module. + delete M; + return true; +} + +Module* +llvm::GetBitcodeSymbols(const char *BufPtr, unsigned Length, + const std::string& ModuleID, + LLVMContext& Context, + std::vector<std::string>& symbols, + std::string* ErrMsg) { + // Get the module. + OwningPtr<MemoryBuffer> Buffer( + MemoryBuffer::getMemBufferCopy(StringRef(BufPtr, Length),ModuleID.c_str())); + + Module *M = ParseBitcodeFile(Buffer.get(), Context, ErrMsg); + if (!M) + return 0; + + // Get the symbols + getSymbols(M, symbols); + + // Done with the module. Note that it's the caller's responsibility to delete + // the Module. + return M; +} |