forked from OSchip/llvm-project
140 lines
3.9 KiB
C++
140 lines
3.9 KiB
C++
//===- lib/ReaderWriter/MachO/TLVPass.cpp -----------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Linker
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
///
|
|
/// \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) {}
|
|
|
|
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("<mach-o TLV Pass>") {
|
|
_file.setOrdinal(_ctx.getNextOrdinalAndIncrement());
|
|
}
|
|
|
|
private:
|
|
std::error_code 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 make_dynamic_error_code(
|
|
"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 std::error_code();
|
|
}
|
|
|
|
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(llvm::make_unique<TLVPass>(ctx));
|
|
}
|
|
|
|
} // end namesapce mach_o
|
|
} // end namesapce lld
|