99 lines
3.5 KiB
C++
99 lines
3.5 KiB
C++
//===- lib/ReaderWriter/ELF/DynamicLibraryWriter.h ------------------------===//
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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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#ifndef LLD_READER_WRITER_ELF_DYNAMIC_LIBRARY_WRITER_H
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#define LLD_READER_WRITER_ELF_DYNAMIC_LIBRARY_WRITER_H
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#include "OutputELFWriter.h"
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namespace lld {
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namespace elf {
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using namespace llvm;
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using namespace llvm::object;
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template<class ELFT>
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class DynamicLibraryWriter;
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//===----------------------------------------------------------------------===//
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// DynamicLibraryWriter Class
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//===----------------------------------------------------------------------===//
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template<class ELFT>
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class DynamicLibraryWriter : public OutputELFWriter<ELFT> {
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public:
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DynamicLibraryWriter(const ELFLinkingContext &context)
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: OutputELFWriter<ELFT>(context),
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_runtimeFile(new CRuntimeFile<ELFT>(context)) {}
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private:
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void buildDynamicSymbolTable(const File &file);
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void addDefaultAtoms();
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virtual bool createImplicitFiles(std::vector<std::unique_ptr<File> > &);
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void finalizeDefaultAtomValues();
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llvm::BumpPtrAllocator _alloc;
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std::unique_ptr<CRuntimeFile<ELFT> > _runtimeFile;
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};
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//===----------------------------------------------------------------------===//
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// DynamicLibraryWriter
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//===----------------------------------------------------------------------===//
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template <class ELFT>
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void DynamicLibraryWriter<ELFT>::buildDynamicSymbolTable(const File &file) {
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// Add all the defined symbols to the dynamic symbol table
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// we need hooks into the Atom to find out which atoms need
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// to be exported
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for (auto sec : this->_layout->sections())
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if (auto section = dyn_cast<AtomSection<ELFT>>(sec))
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for (const auto &atom : section->atoms()) {
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const DefinedAtom *da = dyn_cast<const DefinedAtom>(atom->_atom);
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if (da && (da->scope() != DefinedAtom::scopeTranslationUnit))
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this->_dynamicSymbolTable->addSymbol(atom->_atom, section->ordinal(),
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atom->_virtualAddr, atom);
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}
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for (const UndefinedAtom *a : file.undefined())
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this->_dynamicSymbolTable->addSymbol(a, ELF::SHN_UNDEF);
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OutputELFWriter<ELFT>::buildDynamicSymbolTable(file);
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}
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template <class ELFT> void DynamicLibraryWriter<ELFT>::addDefaultAtoms() {
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_runtimeFile->addAbsoluteAtom("_end");
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}
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/// \brief Hook in lld to add CRuntime file
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template <class ELFT>
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bool DynamicLibraryWriter<ELFT>::createImplicitFiles(
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std::vector<std::unique_ptr<File> > &result) {
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// Add the default atoms as defined by executables
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addDefaultAtoms();
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OutputELFWriter<ELFT>::createImplicitFiles(result);
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result.push_back(std::move(_runtimeFile));
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return true;
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}
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template <class ELFT>
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void DynamicLibraryWriter<ELFT>::finalizeDefaultAtomValues() {
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auto underScoreEndAtomIter = this->_layout->findAbsoluteAtom("_end");
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if (auto bssSection = this->_layout->findOutputSection(".bss")) {
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(*underScoreEndAtomIter)->_virtualAddr =
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bssSection->virtualAddr() + bssSection->memSize();
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} else if (auto dataSection = this->_layout->findOutputSection(".data")) {
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(*underScoreEndAtomIter)->_virtualAddr =
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dataSection->virtualAddr() + dataSection->memSize();
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}
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this->_targetHandler.finalizeSymbolValues();
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}
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} // namespace elf
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} // namespace lld
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#endif // LLD_READER_WRITER_ELF_DYNAMIC_LIBRARY_WRITER_H
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