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272 lines
8.0 KiB
C++
272 lines
8.0 KiB
C++
//===-- Archive.cpp - Generic LLVM archive functions ------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Reid Spencer and is distributed under the
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// University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the implementation of the Archive and ArchiveMember
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// classes that is common to both reading and writing archives..
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//
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//===----------------------------------------------------------------------===//
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#include "ArchiveInternals.h"
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#include "llvm/Bitcode/ReaderWriter.h"
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#include "llvm/ModuleProvider.h"
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#include "llvm/Module.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/System/Process.h"
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using namespace llvm;
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// getMemberSize - compute the actual physical size of the file member as seen
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// on disk. This isn't the size of member's payload. Use getSize() for that.
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unsigned
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ArchiveMember::getMemberSize() const {
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// Basically its the file size plus the header size
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unsigned result = info.fileSize + sizeof(ArchiveMemberHeader);
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// If it has a long filename, include the name length
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if (hasLongFilename())
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result += path.toString().length() + 1;
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// If its now odd lengthed, include the padding byte
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if (result % 2 != 0 )
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result++;
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return result;
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}
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// This default constructor is only use by the ilist when it creates its
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// sentry node. We give it specific static values to make it stand out a bit.
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ArchiveMember::ArchiveMember()
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: next(0), prev(0), parent(0), path("--invalid--"), flags(0), data(0)
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{
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info.user = sys::Process::GetCurrentUserId();
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info.group = sys::Process::GetCurrentGroupId();
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info.mode = 0777;
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info.fileSize = 0;
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info.modTime = sys::TimeValue::now();
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}
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// This is the constructor that the Archive class uses when it is building or
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// reading an archive. It just defaults a few things and ensures the parent is
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// set for the iplist. The Archive class fills in the ArchiveMember's data.
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// This is required because correctly setting the data may depend on other
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// things in the Archive.
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ArchiveMember::ArchiveMember(Archive* PAR)
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: next(0), prev(0), parent(PAR), path(), flags(0), data(0)
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{
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}
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// This method allows an ArchiveMember to be replaced with the data for a
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// different file, presumably as an update to the member. It also makes sure
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// the flags are reset correctly.
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bool ArchiveMember::replaceWith(const sys::Path& newFile, std::string* ErrMsg) {
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if (!newFile.exists()) {
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if (ErrMsg)
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*ErrMsg = "Can not replace an archive member with a non-existent file";
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return true;
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}
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data = 0;
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path = newFile;
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// SVR4 symbol tables have an empty name
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if (path.toString() == ARFILE_SVR4_SYMTAB_NAME)
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flags |= SVR4SymbolTableFlag;
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else
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flags &= ~SVR4SymbolTableFlag;
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// BSD4.4 symbol tables have a special name
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if (path.toString() == ARFILE_BSD4_SYMTAB_NAME)
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flags |= BSD4SymbolTableFlag;
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else
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flags &= ~BSD4SymbolTableFlag;
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// LLVM symbol tables have a very specific name
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if (path.toString() == ARFILE_LLVM_SYMTAB_NAME)
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flags |= LLVMSymbolTableFlag;
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else
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flags &= ~LLVMSymbolTableFlag;
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// String table name
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if (path.toString() == ARFILE_STRTAB_NAME)
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flags |= StringTableFlag;
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else
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flags &= ~StringTableFlag;
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// If it has a slash then it has a path
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bool hasSlash = path.toString().find('/') != std::string::npos;
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if (hasSlash)
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flags |= HasPathFlag;
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else
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flags &= ~HasPathFlag;
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// If it has a slash or its over 15 chars then its a long filename format
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if (hasSlash || path.toString().length() > 15)
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flags |= HasLongFilenameFlag;
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else
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flags &= ~HasLongFilenameFlag;
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// Get the signature and status info
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const char* signature = (const char*) data;
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std::string magic;
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if (!signature) {
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path.getMagicNumber(magic,4);
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signature = magic.c_str();
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std::string err;
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const sys::FileStatus *FSinfo = path.getFileStatus(false, ErrMsg);
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if (FSinfo)
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info = *FSinfo;
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else
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return true;
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}
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// Determine what kind of file it is
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switch (sys::IdentifyFileType(signature,4)) {
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case sys::Bytecode_FileType:
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flags |= BytecodeFlag;
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break;
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case sys::CompressedBytecode_FileType:
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flags |= CompressedBytecodeFlag;
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flags &= ~CompressedFlag;
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break;
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default:
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flags &= ~(BytecodeFlag|CompressedBytecodeFlag);
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break;
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}
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return false;
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}
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// Archive constructor - this is the only constructor that gets used for the
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// Archive class. Everything else (default,copy) is deprecated. This just
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// initializes and maps the file into memory, if requested.
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Archive::Archive(const sys::Path& filename)
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: archPath(filename), members(), mapfile(0), base(0), symTab(), strtab(),
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symTabSize(0), firstFileOffset(0), modules(), foreignST(0) {
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}
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bool
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Archive::mapToMemory(std::string* ErrMsg)
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{
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mapfile = new sys::MappedFile();
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if (mapfile->open(archPath, sys::MappedFile::READ_ACCESS, ErrMsg))
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return true;
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if (!(base = (char*) mapfile->map(ErrMsg)))
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return true;
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return false;
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}
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void Archive::cleanUpMemory() {
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// Shutdown the file mapping
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if (mapfile) {
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mapfile->close();
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delete mapfile;
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mapfile = 0;
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base = 0;
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}
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// Forget the entire symbol table
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symTab.clear();
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symTabSize = 0;
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firstFileOffset = 0;
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// Free the foreign symbol table member
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if (foreignST) {
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delete foreignST;
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foreignST = 0;
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}
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// Delete any ModuleProviders and ArchiveMember's we've allocated as a result
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// of symbol table searches.
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for (ModuleMap::iterator I=modules.begin(), E=modules.end(); I != E; ++I ) {
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delete I->second.first;
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delete I->second.second;
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}
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}
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// Archive destructor - just clean up memory
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Archive::~Archive() {
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cleanUpMemory();
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}
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static void getSymbols(Module*M, std::vector<std::string>& symbols) {
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// Loop over global variables
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for (Module::global_iterator GI = M->global_begin(), GE=M->global_end(); GI != GE; ++GI)
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if (!GI->isDeclaration() && !GI->hasInternalLinkage())
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if (!GI->getName().empty())
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symbols.push_back(GI->getName());
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// Loop over functions.
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for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI)
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if (!FI->isDeclaration() && !FI->hasInternalLinkage())
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if (!FI->getName().empty())
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symbols.push_back(FI->getName());
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}
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// Get just the externally visible defined symbols from the bytecode
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bool llvm::GetBytecodeSymbols(const sys::Path& fName,
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std::vector<std::string>& symbols,
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std::string* ErrMsg) {
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std::auto_ptr<MemoryBuffer> Buffer(
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MemoryBuffer::getFileOrSTDIN(&fName.toString()[0],
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fName.toString().size()));
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if (!Buffer.get()) {
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if (ErrMsg) *ErrMsg = "Could not open file '" + fName.toString() + "'";
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return true;
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}
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ModuleProvider *MP = getBitcodeModuleProvider(Buffer.get(), ErrMsg);
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if (!MP)
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return true;
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// Get the module from the provider
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Module* M = MP->materializeModule();
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if (M == 0) {
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delete MP;
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return true;
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}
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// Get the symbols
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getSymbols(M, symbols);
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// Done with the module.
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delete MP;
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return true;
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}
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ModuleProvider*
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llvm::GetBytecodeSymbols(const unsigned char *BufPtr, unsigned Length,
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const std::string& ModuleID,
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std::vector<std::string>& symbols,
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std::string* ErrMsg) {
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// Get the module provider
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MemoryBuffer *Buffer =MemoryBuffer::getNewMemBuffer(Length, ModuleID.c_str());
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memcpy((char*)Buffer->getBufferStart(), BufPtr, Length);
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ModuleProvider *MP = getBitcodeModuleProvider(Buffer, ErrMsg);
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if (!MP)
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return 0;
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// Get the module from the provider
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Module* M = MP->materializeModule();
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if (M == 0) {
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delete MP;
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return 0;
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}
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// Get the symbols
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getSymbols(M, symbols);
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// Done with the module. Note that ModuleProvider will delete the
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// Module when it is deleted. Also note that its the caller's responsibility
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// to delete the ModuleProvider.
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return MP;
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}
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