4c81bb7e3f
At present each TargetRelocationHandler generates a pretty similar error string and calls llvm_unreachable() when encountering an unknown relocation. This is not ideal for two reasons: 1. llvm_unreachable disappears in release builds but we still want to know if we encountered a relocation we couldn't handle in release builds. 2. Duplication is bad - there is no need to have a per-architecture error message. This change adds a test for AArch64 to test whether or not the error message actually works. The other architectures have not been tested but they compile and check-lld passes. llvm-svn: 223782
107 lines
3.6 KiB
C++
107 lines
3.6 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/Atom.h"
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#include "lld/Core/LLVM.h"
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#include "lld/Core/LinkingContext.h"
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#include "lld/Core/STDExtras.h"
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#include "lld/ReaderWriter/ELFLinkingContext.h"
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#include "llvm/ADT/Hashing.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/ErrorHandling.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 DynamicTable;
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template <class ELFT> class DynamicSymbolTable;
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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 ELFHeader;
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template <class ELFT> class Section;
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template <class ELFT> class TargetLayout;
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template <class ELFT> class TargetRelocationHandler {
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public:
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/// Constructor
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TargetRelocationHandler(ELFLinkingContext &targetInfo)
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: _context(targetInfo) {}
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virtual std::error_code applyRelocation(ELFWriter &, llvm::FileOutputBuffer &,
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const lld::AtomLayout &,
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const Reference &) const = 0;
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void unhandledReferenceType(const Atom &atom, const Reference &ref) const {
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llvm::errs() << "Unhandled reference type in file " << atom.file().path()
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<< ": reference from " << atom.name() << "+"
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<< ref.offsetInAtom() << " to " << ref.target()->name()
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<< "+" << ref.addend() << " of type ";
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StringRef kindValStr;
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if (!_context.registry().referenceKindToString(ref.kindNamespace(),
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ref.kindArch(),
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ref.kindValue(),
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kindValStr)) {
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kindValStr = "unknown";
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}
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llvm::errs() << ref.kindValue() << " (" << kindValStr << ")\n";
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llvm::report_fatal_error("unhandled reference type");
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}
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virtual ~TargetRelocationHandler() {}
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private:
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ELFLinkingContext &_context;
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};
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/// \brief TargetHandler contains all the information responsible to handle a
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/// a particular target on ELF. A target might wish to override implementation
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/// of creating atoms and how the atoms are written to the output file.
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template <class ELFT> class TargetHandler : public TargetHandlerBase {
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public:
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/// Constructor
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TargetHandler(ELFLinkingContext &targetInfo) : _context(targetInfo) {}
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/// The layout determined completely by the Target.
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virtual TargetLayout<ELFT> &getTargetLayout() = 0;
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/// Determine how relocations need to be applied.
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virtual const TargetRelocationHandler<ELFT> &getRelocationHandler() const = 0;
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/// How does the target deal with reading input files.
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virtual std::unique_ptr<Reader> getObjReader(bool) = 0;
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/// How does the target deal with reading dynamic libraries.
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virtual std::unique_ptr<Reader> getDSOReader(bool) = 0;
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/// How does the target deal with writing ELF output.
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virtual std::unique_ptr<Writer> getWriter() = 0;
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private:
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ELFLinkingContext &_context;
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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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