390 lines
9.1 KiB
C++
390 lines
9.1 KiB
C++
//===- lib/ReaderWriter/CoreTargetInfo.cpp --------------------------------===//
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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/ReaderWriter/CoreTargetInfo.h"
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#include "lld/Core/Pass.h"
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#include "lld/Core/PassManager.h"
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#include "lld/Passes/LayoutPass.h"
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#include "llvm/ADT/ArrayRef.h"
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using namespace lld;
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namespace {
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/// \brief Simple atom created by the stubs pass.
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class TestingStubAtom : public DefinedAtom {
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public:
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TestingStubAtom(const File &F, const Atom&) : _file(F) {
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static uint32_t lastOrdinal = 0;
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_ordinal = lastOrdinal++;
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}
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virtual const File &file() const {
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return _file;
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}
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virtual StringRef name() const {
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return StringRef();
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}
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virtual uint64_t ordinal() const {
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return _ordinal;
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}
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virtual uint64_t size() const {
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return 0;
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}
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virtual Scope scope() const {
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return DefinedAtom::scopeLinkageUnit;
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}
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virtual Interposable interposable() const {
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return DefinedAtom::interposeNo;
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}
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virtual Merge merge() const {
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return DefinedAtom::mergeNo;
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}
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virtual ContentType contentType() const {
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return DefinedAtom::typeStub;
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}
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virtual Alignment alignment() const {
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return Alignment(0, 0);
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}
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virtual SectionChoice sectionChoice() const {
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return DefinedAtom::sectionBasedOnContent;
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}
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virtual StringRef customSectionName() const {
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return StringRef();
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}
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virtual SectionPosition sectionPosition() const {
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return sectionPositionAny;
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}
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virtual DeadStripKind deadStrip() const {
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return DefinedAtom::deadStripNormal;
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}
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virtual ContentPermissions permissions() const {
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return DefinedAtom::permR_X;
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}
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virtual bool isAlias() const {
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return false;
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}
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virtual ArrayRef<uint8_t> rawContent() const {
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return ArrayRef<uint8_t>();
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}
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virtual reference_iterator begin() const {
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return reference_iterator(*this, nullptr);
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}
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virtual reference_iterator end() const {
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return reference_iterator(*this, nullptr);
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}
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virtual const Reference *derefIterator(const void *iter) const {
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return nullptr;
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}
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virtual void incrementIterator(const void *&iter) const {
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}
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private:
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const File &_file;
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uint32_t _ordinal;
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};
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/// \brief Simple atom created by the GOT pass.
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class TestingGOTAtom : public DefinedAtom {
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public:
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TestingGOTAtom(const File &F, const Atom&) : _file(F) {
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static uint32_t lastOrdinal = 0;
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_ordinal = lastOrdinal++;
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}
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virtual const File &file() const {
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return _file;
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}
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virtual StringRef name() const {
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return StringRef();
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}
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virtual uint64_t ordinal() const {
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return _ordinal;
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}
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virtual uint64_t size() const {
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return 0;
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}
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virtual Scope scope() const {
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return DefinedAtom::scopeLinkageUnit;
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}
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virtual Interposable interposable() const {
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return DefinedAtom::interposeNo;
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}
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virtual Merge merge() const {
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return DefinedAtom::mergeNo;
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}
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virtual ContentType contentType() const {
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return DefinedAtom::typeGOT;
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}
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virtual Alignment alignment() const {
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return Alignment(3, 0);
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}
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virtual SectionChoice sectionChoice() const {
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return DefinedAtom::sectionBasedOnContent;
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}
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virtual StringRef customSectionName() const {
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return StringRef();
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}
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virtual SectionPosition sectionPosition() const {
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return sectionPositionAny;
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}
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virtual DeadStripKind deadStrip() const {
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return DefinedAtom::deadStripNormal;
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}
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virtual ContentPermissions permissions() const {
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return DefinedAtom::permRW_;
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}
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virtual bool isAlias() const {
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return false;
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}
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virtual ArrayRef<uint8_t> rawContent() const {
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return ArrayRef<uint8_t>();
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}
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virtual reference_iterator begin() const {
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return reference_iterator(*this, nullptr);
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}
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virtual reference_iterator end() const {
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return reference_iterator(*this, nullptr);
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}
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virtual const Reference *derefIterator(const void *iter) const {
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return nullptr;
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}
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virtual void incrementIterator(const void *&iter) const {
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}
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private:
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const File &_file;
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uint32_t _ordinal;
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};
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class TestingPassFile : public MutableFile {
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public:
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TestingPassFile(const TargetInfo &ti) : MutableFile(ti, "Testing pass") {}
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virtual void addAtom(const Atom &atom) {
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if (const DefinedAtom *defAtom = dyn_cast<DefinedAtom>(&atom))
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_definedAtoms._atoms.push_back(defAtom);
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else
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llvm_unreachable("atom has unknown definition kind");
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}
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virtual DefinedAtomRange definedAtoms() {
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return range<std::vector<const DefinedAtom*>::iterator>(
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_definedAtoms._atoms.begin(), _definedAtoms._atoms.end());
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}
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virtual const atom_collection<DefinedAtom> &defined() const {
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return _definedAtoms;
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}
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virtual const atom_collection<UndefinedAtom> &undefined() const {
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return _undefinedAtoms;
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}
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virtual const atom_collection<SharedLibraryAtom> &sharedLibrary() const {
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return _sharedLibraryAtoms;
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}
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virtual const atom_collection<AbsoluteAtom> &absolute() const {
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return _absoluteAtoms;
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}
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private:
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atom_collection_vector<DefinedAtom> _definedAtoms;
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atom_collection_vector<UndefinedAtom> _undefinedAtoms;
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atom_collection_vector<SharedLibraryAtom> _sharedLibraryAtoms;
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atom_collection_vector<AbsoluteAtom> _absoluteAtoms;
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};
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struct TestingKindMapping {
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const char *string;
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int32_t value;
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bool isBranch;
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bool isGotLoad;
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bool isGotUse;
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};
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//
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// Table of fixup kinds in YAML documents used for testing
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//
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const TestingKindMapping sKinds[] = {
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{"in-group", -3, false, false, false},
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{"layout-after", -2, false, false, false},
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{"layout-before", -1, false, false, false},
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{"call32", 2, true, false, false},
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{"pcrel32", 3, false, false, false},
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{"gotLoad32", 7, false, true, true},
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{"gotUse32", 9, false, false, true},
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{"lea32wasGot", 8, false, false, false},
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{nullptr, 0, false, false, false}
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};
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class TestingStubsPass : public StubsPass {
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public:
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TestingStubsPass(const TargetInfo &ti) : _file(TestingPassFile(ti))
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{}
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virtual bool noTextRelocs() {
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return true;
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}
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virtual bool isCallSite(int32_t kind) {
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for (const TestingKindMapping *p = sKinds; p->string != nullptr; ++p) {
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if (kind == p->value)
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return p->isBranch;
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}
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return false;
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}
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virtual const DefinedAtom *getStub(const Atom &target) {
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const DefinedAtom *result = new TestingStubAtom(_file, target);
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_file.addAtom(*result);
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return result;
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}
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virtual void addStubAtoms(MutableFile &mergedFile) {
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for (const DefinedAtom *stub : _file.defined() ) {
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mergedFile.addAtom(*stub);
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}
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}
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private:
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TestingPassFile _file;
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};
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class TestingGOTPass : public GOTPass {
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public:
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TestingGOTPass(const TargetInfo &ti) : _file(TestingPassFile(ti))
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{}
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virtual bool noTextRelocs() {
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return true;
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}
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virtual bool isGOTAccess(int32_t kind, bool &canBypassGOT) {
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for (const TestingKindMapping *p = sKinds; p->string != nullptr; ++p) {
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if (kind == p->value) {
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canBypassGOT = p->isGotLoad;
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return p->isGotUse || p->isGotLoad;
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}
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}
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return false;
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}
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virtual void updateReferenceToGOT(const Reference *ref, bool targetIsNowGOT) {
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if (targetIsNowGOT)
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const_cast<Reference*>(ref)->setKind(3); // pcrel32
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else
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const_cast<Reference*>(ref)->setKind(8); // lea32wasGot
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}
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virtual const DefinedAtom *makeGOTEntry(const Atom &target) {
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return new TestingGOTAtom(_file, target);
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}
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private:
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TestingPassFile _file;
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};
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} // anonymous namespace
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CoreTargetInfo::CoreTargetInfo() {
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}
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bool CoreTargetInfo::validateImpl(raw_ostream &diagnostics) {
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return false;
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}
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void CoreTargetInfo::addPasses(PassManager &pm) const {
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for (StringRef name : _passNames) {
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if ( name.equals("layout") )
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pm.add(std::unique_ptr<Pass>((new LayoutPass())));
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else if ( name.equals("GOT") )
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pm.add(std::unique_ptr<Pass>(new TestingGOTPass(*this)));
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else if ( name.equals("stubs") )
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pm.add(std::unique_ptr<Pass>(new TestingStubsPass(*this)));
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else
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llvm_unreachable("bad pass name");
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}
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}
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error_code CoreTargetInfo::parseFile(std::unique_ptr<MemoryBuffer> &mb,
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std::vector<std::unique_ptr<File>> &result) const {
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if (!_reader)
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_reader = createReaderYAML(*this);
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return _reader->parseFile(mb,result);
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}
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Writer &CoreTargetInfo::writer() const {
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if (!_writer)
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_writer = createWriterYAML(*this);
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return *_writer;
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}
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ErrorOr<Reference::Kind>
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CoreTargetInfo::relocKindFromString(StringRef str) const {
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for (const TestingKindMapping *p = sKinds; p->string != nullptr; ++p) {
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if (str.equals(p->string))
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return p->value;
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}
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return make_error_code(yaml_reader_error::illegal_value);
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}
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ErrorOr<std::string>
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CoreTargetInfo::stringFromRelocKind(Reference::Kind kind) const {
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for (const TestingKindMapping *p = sKinds; p->string != nullptr; ++p) {
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if (kind == p->value)
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return std::string(p->string);
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}
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return make_error_code(yaml_reader_error::illegal_value);
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}
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