3907f2a802
This patch is to support --defsym option for ELF file format/GNU-compatible driver. Currently it takes a symbol name followed by '=' and a number. If such option is given, the driver sets up an absolute symbol with the specified address. You can specify multiple --defsym options to define multiple symbols. GNU LD's --defsym provides many more features. For example, it allows users to specify another symbol name instead of a number to define a symbol alias, or it even allows a symbol plus an offset (e.g. --defsym=foo+3) to define symbol- relative alias. This patch does not support that, but will be supported in subsequent patches. Differential Revision: http://llvm-reviews.chandlerc.com/D3208 llvm-svn: 205029
120 lines
4.2 KiB
C++
120 lines
4.2 KiB
C++
//===- lib/Core/LinkingContext.cpp - Linker Context Object Interface ------===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "lld/Core/LinkingContext.h"
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#include "lld/Core/Resolver.h"
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#include "lld/ReaderWriter/Writer.h"
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#include "lld/ReaderWriter/Simple.h"
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#include "llvm/ADT/Triple.h"
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namespace lld {
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LinkingContext::LinkingContext()
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: _deadStrip(false), _allowDuplicates(false),
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_globalsAreDeadStripRoots(false),
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_searchArchivesToOverrideTentativeDefinitions(false),
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_searchSharedLibrariesToOverrideTentativeDefinitions(false),
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_warnIfCoalesableAtomsHaveDifferentCanBeNull(false),
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_warnIfCoalesableAtomsHaveDifferentLoadName(false),
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_printRemainingUndefines(true), _allowRemainingUndefines(false),
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_logInputFiles(false), _allowShlibUndefines(false),
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_outputFileType(OutputFileType::Default), _currentInputElement(nullptr),
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_nextOrdinal(0) {}
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LinkingContext::~LinkingContext() {}
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bool LinkingContext::validate(raw_ostream &diagnostics) {
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return validateImpl(diagnostics);
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}
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error_code LinkingContext::writeFile(const File &linkedFile) const {
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return this->writer().writeFile(linkedFile, _outputPath);
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}
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bool LinkingContext::createImplicitFiles(
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std::vector<std::unique_ptr<File> > &result) const {
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return this->writer().createImplicitFiles(result);
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}
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std::unique_ptr<File> LinkingContext::createEntrySymbolFile() const {
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return createEntrySymbolFile("<command line option -e>");
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}
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std::unique_ptr<File>
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LinkingContext::createEntrySymbolFile(StringRef filename) const {
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if (entrySymbolName().empty())
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return nullptr;
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std::unique_ptr<SimpleFile> entryFile(new SimpleFile(filename));
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entryFile->addAtom(
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*(new (_allocator) SimpleUndefinedAtom(*entryFile, entrySymbolName())));
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return std::move(entryFile);
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}
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std::unique_ptr<File> LinkingContext::createUndefinedSymbolFile() const {
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return createUndefinedSymbolFile("<command line option -u or --defsym>");
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}
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std::unique_ptr<File>
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LinkingContext::createUndefinedSymbolFile(StringRef filename) const {
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if (_initialUndefinedSymbols.empty())
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return nullptr;
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std::unique_ptr<SimpleFile> undefinedSymFile(new SimpleFile(filename));
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for (auto undefSymStr : _initialUndefinedSymbols)
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undefinedSymFile->addAtom(*(new (_allocator) SimpleUndefinedAtom(
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*undefinedSymFile, undefSymStr)));
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return std::move(undefinedSymFile);
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}
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void LinkingContext::createInternalFiles(
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std::vector<std::unique_ptr<File> > &result) const {
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std::unique_ptr<File> internalFile;
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internalFile = createEntrySymbolFile();
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if (internalFile)
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result.push_back(std::move(internalFile));
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internalFile = createUndefinedSymbolFile();
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if (internalFile)
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result.push_back(std::move(internalFile));
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}
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void LinkingContext::setResolverState(uint32_t state) {
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_currentInputElement->setResolveState(state);
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}
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ErrorOr<File &> LinkingContext::nextFile() {
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// When nextFile() is called for the first time, _currentInputElement is not
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// initialized. Initialize it with the first element of the input graph.
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if (_currentInputElement == nullptr) {
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ErrorOr<InputElement *> elem = inputGraph().getNextInputElement();
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if (elem.getError() == InputGraphError::no_more_elements)
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return make_error_code(InputGraphError::no_more_files);
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_currentInputElement = *elem;
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}
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// Otherwise, try to get the next file of _currentInputElement. If the current
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// input element points to an archive file, and there's a file left in the
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// archive, it will succeed. If not, try to get the next file in the input
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// graph.
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for (;;) {
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ErrorOr<File &> nextFile = _currentInputElement->getNextFile();
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if (nextFile.getError() != InputGraphError::no_more_files)
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return std::move(nextFile);
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ErrorOr<InputElement *> elem = inputGraph().getNextInputElement();
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if (elem.getError() == InputGraphError::no_more_elements ||
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*elem == nullptr)
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return make_error_code(InputGraphError::no_more_files);
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_currentInputElement = *elem;
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}
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}
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void LinkingContext::addPasses(PassManager &pm) {}
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} // end namespace lld
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