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Current Path: /usr/src/contrib/llvm-project/lld/lib/ReaderWriter/MachO

usr / src / contrib / llvm-project / lld / lib / ReaderWriter / MachO /

📁 ..
📄 ArchHandler.cpp(4.36 KB)
📄 ArchHandler.h(12.86 KB)
📄 ArchHandler_arm.cpp(54.53 KB)
📄 ArchHandler_arm64.cpp(33.86 KB)
📄 ArchHandler_x86.cpp(24.04 KB)
📄 ArchHandler_x86_64.cpp(33.45 KB)
📄 Atoms.h(5.45 KB)
📄 CompactUnwindPass.cpp(21.9 KB)
📄 DebugInfo.h(2.52 KB)
📄 ExecutableAtoms.h(4.69 KB)
📄 File.h(17.28 KB)
📄 FlatNamespaceFile.h(1.87 KB)
📄 GOTPass.cpp(6.58 KB)
📄 LayoutPass.cpp(18.19 KB)
📄 LayoutPass.h(4.19 KB)
📄 MachOLinkingContext.cpp(33.61 KB)
📄 MachONormalizedFile.h(11.47 KB)
📄 MachONormalizedFileBinaryReader.cpp(22.82 KB)
📄 MachONormalizedFileBinaryUtils.h(6.93 KB)
📄 MachONormalizedFileBinaryWriter.cpp(56.33 KB)
📄 MachONormalizedFileFromAtoms.cpp(61.05 KB)
📄 MachONormalizedFileToAtoms.cpp(65.46 KB)
📄 MachONormalizedFileYAML.cpp(31.45 KB)
📄 MachOPasses.h(1.11 KB)
📄 ObjCPass.cpp(3.54 KB)
📄 SectCreateFile.h(3.01 KB)
📄 ShimPass.cpp(4.59 KB)
📄 StubsPass.cpp(12.03 KB)
📄 TLVPass.cpp(4.02 KB)
📄 WriterMachO.cpp(2.33 KB)

Editing: TLVPass.cpp

//===- lib/ReaderWriter/MachO/TLVPass.cpp -----------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This linker pass transforms all TLV references to real references.
///
//===----------------------------------------------------------------------===//

#include "ArchHandler.h"
#include "File.h"
#include "MachOPasses.h"
#include "lld/Core/Simple.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Debug.h"

namespace lld {
namespace mach_o {

//
// TLVP Entry Atom created by the TLV pass.
//
class TLVPEntryAtom : public SimpleDefinedAtom {
public:
  TLVPEntryAtom(const File &file, bool is64, StringRef name)
      : SimpleDefinedAtom(file), _is64(is64), _name(name) {}

~TLVPEntryAtom() override = default;

ContentType contentType() const override {
    return DefinedAtom::typeTLVInitializerPtr;
  }

Alignment alignment() const override {
    return _is64 ? 8 : 4;
  }

uint64_t size() const override {
    return _is64 ? 8 : 4;
  }

ContentPermissions permissions() const override {
    return DefinedAtom::permRW_;
  }

ArrayRef<uint8_t> rawContent() const override {
    static const uint8_t zeros[] =
      { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
    return llvm::makeArrayRef(zeros, size());
  }

StringRef slotName() const {
    return _name;
  }

private:
  const bool _is64;
  StringRef _name;
};

class TLVPass : public Pass {
public:
  TLVPass(const MachOLinkingContext &context)
      : _ctx(context), _archHandler(_ctx.archHandler()),
        _file(*_ctx.make_file<MachOFile>("<mach-o TLV pass>")) {
    _file.setOrdinal(_ctx.getNextOrdinalAndIncrement());
  }

private:
  llvm::Error perform(SimpleFile &mergedFile) override {
    bool allowTLV = _ctx.minOS("10.7", "1.0");

for (const DefinedAtom *atom : mergedFile.defined()) {
      for (const Reference *ref : *atom) {
        if (!_archHandler.isTLVAccess(*ref))
          continue;

if (!allowTLV)
          return llvm::make_error<GenericError>(
            "targeted OS version does not support use of thread local "
            "variables in " + atom->name() + " for architecture " +
            _ctx.archName());

const Atom *target = ref->target();
        assert(target != nullptr);

const DefinedAtom *tlvpEntry = makeTLVPEntry(target);
        const_cast<Reference*>(ref)->setTarget(tlvpEntry);
        _archHandler.updateReferenceToTLV(ref);
      }
    }

std::vector<const TLVPEntryAtom*> entries;
    entries.reserve(_targetToTLVP.size());
    for (auto &it : _targetToTLVP)
      entries.push_back(it.second);
    std::sort(entries.begin(), entries.end(),
              [](const TLVPEntryAtom *lhs, const TLVPEntryAtom *rhs) {
                return (lhs->slotName().compare(rhs->slotName()) < 0);
              });

for (const TLVPEntryAtom *slot : entries)
      mergedFile.addAtom(*slot);

return llvm::Error::success();
  }

const DefinedAtom *makeTLVPEntry(const Atom *target) {
    auto pos = _targetToTLVP.find(target);

if (pos != _targetToTLVP.end())
      return pos->second;

auto *tlvpEntry = new (_file.allocator())
      TLVPEntryAtom(_file, _ctx.is64Bit(), target->name());
    _targetToTLVP[target] = tlvpEntry;
    const ArchHandler::ReferenceInfo &nlInfo =
      _archHandler.stubInfo().nonLazyPointerReferenceToBinder;
    tlvpEntry->addReference(Reference::KindNamespace::mach_o, nlInfo.arch,
                            nlInfo.kind, 0, target, 0);
    return tlvpEntry;
  }

const MachOLinkingContext &_ctx;
  mach_o::ArchHandler &_archHandler;
  MachOFile           &_file;
  llvm::DenseMap<const Atom*, const TLVPEntryAtom*> _targetToTLVP;
};

void addTLVPass(PassManager &pm, const MachOLinkingContext &ctx) {
  assert(ctx.needsTLVPass());
  pm.add(std::make_unique<TLVPass>(ctx));
}

} // end namespace mach_o
} // end namespace lld

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Editing: TLVPass.cpp

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