2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
141 lines
4.0 KiB
C++
141 lines
4.0 KiB
C++
//===- lib/ReaderWriter/MachO/TLVPass.cpp -----------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// This linker pass transforms all TLV references to real references.
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///
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//===----------------------------------------------------------------------===//
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#include "ArchHandler.h"
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#include "File.h"
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#include "MachOPasses.h"
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#include "lld/Core/Simple.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Support/Debug.h"
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namespace lld {
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namespace mach_o {
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//
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// TLVP Entry Atom created by the TLV pass.
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//
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class TLVPEntryAtom : public SimpleDefinedAtom {
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public:
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TLVPEntryAtom(const File &file, bool is64, StringRef name)
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: SimpleDefinedAtom(file), _is64(is64), _name(name) {}
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~TLVPEntryAtom() override = default;
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ContentType contentType() const override {
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return DefinedAtom::typeTLVInitializerPtr;
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}
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Alignment alignment() const override {
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return _is64 ? 8 : 4;
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}
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uint64_t size() const override {
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return _is64 ? 8 : 4;
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}
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ContentPermissions permissions() const override {
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return DefinedAtom::permRW_;
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}
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ArrayRef<uint8_t> rawContent() const override {
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static const uint8_t zeros[] =
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
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return llvm::makeArrayRef(zeros, size());
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}
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StringRef slotName() const {
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return _name;
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}
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private:
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const bool _is64;
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StringRef _name;
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};
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class TLVPass : public Pass {
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public:
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TLVPass(const MachOLinkingContext &context)
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: _ctx(context), _archHandler(_ctx.archHandler()),
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_file(*_ctx.make_file<MachOFile>("<mach-o TLV pass>")) {
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_file.setOrdinal(_ctx.getNextOrdinalAndIncrement());
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}
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private:
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llvm::Error perform(SimpleFile &mergedFile) override {
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bool allowTLV = _ctx.minOS("10.7", "1.0");
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for (const DefinedAtom *atom : mergedFile.defined()) {
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for (const Reference *ref : *atom) {
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if (!_archHandler.isTLVAccess(*ref))
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continue;
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if (!allowTLV)
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return llvm::make_error<GenericError>(
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"targeted OS version does not support use of thread local "
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"variables in " + atom->name() + " for architecture " +
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_ctx.archName());
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const Atom *target = ref->target();
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assert(target != nullptr);
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const DefinedAtom *tlvpEntry = makeTLVPEntry(target);
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const_cast<Reference*>(ref)->setTarget(tlvpEntry);
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_archHandler.updateReferenceToTLV(ref);
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}
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}
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std::vector<const TLVPEntryAtom*> entries;
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entries.reserve(_targetToTLVP.size());
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for (auto &it : _targetToTLVP)
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entries.push_back(it.second);
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std::sort(entries.begin(), entries.end(),
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[](const TLVPEntryAtom *lhs, const TLVPEntryAtom *rhs) {
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return (lhs->slotName().compare(rhs->slotName()) < 0);
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});
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for (const TLVPEntryAtom *slot : entries)
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mergedFile.addAtom(*slot);
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return llvm::Error::success();
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}
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const DefinedAtom *makeTLVPEntry(const Atom *target) {
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auto pos = _targetToTLVP.find(target);
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if (pos != _targetToTLVP.end())
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return pos->second;
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auto *tlvpEntry = new (_file.allocator())
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TLVPEntryAtom(_file, _ctx.is64Bit(), target->name());
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_targetToTLVP[target] = tlvpEntry;
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const ArchHandler::ReferenceInfo &nlInfo =
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_archHandler.stubInfo().nonLazyPointerReferenceToBinder;
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tlvpEntry->addReference(Reference::KindNamespace::mach_o, nlInfo.arch,
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nlInfo.kind, 0, target, 0);
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return tlvpEntry;
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}
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const MachOLinkingContext &_ctx;
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mach_o::ArchHandler &_archHandler;
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MachOFile &_file;
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llvm::DenseMap<const Atom*, const TLVPEntryAtom*> _targetToTLVP;
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};
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void addTLVPass(PassManager &pm, const MachOLinkingContext &ctx) {
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assert(ctx.needsTLVPass());
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pm.add(llvm::make_unique<TLVPass>(ctx));
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}
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} // end namesapce mach_o
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} // end namesapce lld
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