c314b46e71
The major changes are: 1) LinkerOptions has been merged into TargetInfo 2) LinkerInvocation has been merged into Driver 3) Drivers no longer convert arguments into an intermediate (core) argument list, but instead create a TargetInfo object and call setter methods on it. This is only how in-process linking would work. That is, you can programmatically set up a TargetInfo object which controls the linking. 4) Lots of tweaks to test suite to work with driver changes 5) Add the DarwinDriver 6) I heavily doxygen commented TargetInfo.h Things to do after this patch is committed: a) Consider renaming TargetInfo, given its new roll. b) Consider pulling the list of input files out of TargetInfo. This will enable in-process clients to create one TargetInfo the re-use it with different input file lists. c) Work out a way for Drivers to format the warnings and error done in core linking. llvm-svn: 178776
128 lines
3.7 KiB
C++
128 lines
3.7 KiB
C++
//===- lib/ReaderWriter/ELF/TargetHandler.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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///
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/// \file
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/// \brief These interfaces provide target specific hooks to change the linker's
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/// behaivor.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLD_READER_WRITER_ELF_TARGET_HANDLER_H
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#define LLD_READER_WRITER_ELF_TARGET_HANDLER_H
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#include "Layout.h"
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#include "lld/Core/InputFiles.h"
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#include "lld/Core/LLVM.h"
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#include "lld/Core/TargetInfo.h"
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#include "lld/ReaderWriter/ELFTargetInfo.h"
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#include "llvm/ADT/Hashing.h"
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#include "llvm/Support/FileOutputBuffer.h"
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#include <memory>
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#include <vector>
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namespace lld {
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namespace elf {
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template <class ELFT> class ELFDefinedAtom;
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template <class ELFT> class ELFReference;
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class ELFWriter;
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template <class ELFT> class Header;
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template <class ELFT> class Section;
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template <class ELFT> class TargetLayout;
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/// \brief The target registers a set of handlers for overriding target specific
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/// attributes for a DefinedAtom. The Reader uses this class to query for the
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/// type of atom and its permissions
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template <class ELFT> class TargetAtomHandler {
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public:
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typedef llvm::object::Elf_Shdr_Impl<ELFT> Elf_Shdr;
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typedef llvm::object::Elf_Sym_Impl<ELFT> Elf_Sym;
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virtual DefinedAtom::ContentType
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contentType(const ELFDefinedAtom<ELFT> *atom) const {
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return atom->contentType();
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}
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virtual DefinedAtom::ContentType
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contentType(const Elf_Shdr *shdr, const Elf_Sym *sym) const {
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return DefinedAtom::typeZeroFill;
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}
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virtual DefinedAtom::ContentPermissions
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contentPermissions(const ELFDefinedAtom<ELFT> *atom) const {
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return atom->permissions();
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}
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virtual int64_t getType(const Elf_Sym *sym) const {
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return llvm::ELF::STT_NOTYPE;
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}
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virtual ~TargetAtomHandler() {}
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};
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template <class ELFT> class TargetRelocationHandler {
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public:
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virtual ErrorOr<void>
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applyRelocation(ELFWriter &, llvm::FileOutputBuffer &, const AtomLayout &,
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const Reference &)const = 0;
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virtual int64_t relocAddend(const Reference &)const { return 0; }
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virtual ~TargetRelocationHandler() {}
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};
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/// \brief An interface to override functions that are provided by the
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/// the default ELF Layout
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template <class ELFT> class TargetHandler : public TargetHandlerBase {
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public:
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TargetHandler(ELFTargetInfo &targetInfo) : _targetInfo(targetInfo) {}
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/// If the target overrides ELF header information, this API would
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/// return true, so that the target can set all fields specific to
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/// that target
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virtual bool doesOverrideHeader() = 0;
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/// Set the ELF Header information
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virtual void setHeaderInfo(Header<ELFT> *Header) = 0;
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/// TargetLayout
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virtual TargetLayout<ELFT> &targetLayout() = 0;
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/// TargetAtomHandler
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virtual TargetAtomHandler<ELFT> &targetAtomHandler() = 0;
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virtual const TargetRelocationHandler<ELFT> &getRelocationHandler() const = 0;
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/// Create a set of Default target sections that a target might needj
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virtual void createDefaultSections() = 0;
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/// \brief Add a section to the current Layout
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virtual void addSection(Section<ELFT> *section) = 0;
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/// \brief add new symbol file
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virtual void addFiles(InputFiles &) = 0;
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/// \brief Finalize the symbol values
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virtual void finalizeSymbolValues() = 0;
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/// \brief allocate Commons, some architectures may move small common
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/// symbols over to small data, this would also be used
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virtual void allocateCommons() = 0;
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protected:
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const ELFTargetInfo &_targetInfo;
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};
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} // end namespace elf
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} // end namespace lld
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#endif
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