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//===- lib/MC/MachOCASWriter.cpp - Mach-O CAS File Writer -----------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/BinaryFormat/MachO.h"
#include "llvm/CAS/ObjectStore.h"
#include "llvm/CASUtil/Utils.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmLayout.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDirectives.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCFixupKindInfo.h"
#include "llvm/MC/MCFragment.h"
#include "llvm/MC/MCMachOCASWriter.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCSymbolMachO.h"
#include "llvm/MC/MCValue.h"
#include "llvm/MCCAS/MCCASFormatSchemaBase.h"
#include "llvm/MCCAS/MCCASObjectV1.h"
#include "llvm/Support/Alignment.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <memory>
using namespace llvm;
using namespace llvm::cas;
using namespace llvm::mccasformats;
#define DEBUG_TYPE "mc"
MachOCASWriter::MachOCASWriter(
std::unique_ptr<MCMachObjectTargetWriter> MOTW, const Triple &TT,
cas::ObjectStore &CAS, CASBackendMode Mode, raw_pwrite_stream &OS,
bool IsLittleEndian,
std::function<const cas::ObjectProxy(
llvm::MachOCASWriter &, llvm::MCAssembler &, const llvm::MCAsmLayout &,
cas::ObjectStore &, raw_ostream *)>
CreateFromMcAssembler,
std::function<Error(cas::ObjectProxy, cas::ObjectStore &, raw_ostream &)>
SerializeObjectFile,
std::optional<MCTargetOptions::ResultCallBackTy> ResultCallBack,
raw_pwrite_stream *CasIDOS)
: Target(TT), CAS(CAS), Mode(Mode), ResultCallBack(ResultCallBack), OS(OS),
CasIDOS(CasIDOS), InternalOS(InternalBuffer),
MOW(std::move(MOTW), InternalOS, IsLittleEndian),
CreateFromMcAssembler(CreateFromMcAssembler),
SerializeObjectFile(SerializeObjectFile) {
assert(TT.isLittleEndian() == IsLittleEndian && "Endianess should match");
}
uint64_t MachOCASWriter::writeObject(MCAssembler &Asm,
const MCAsmLayout &Layout) {
uint64_t StartOffset = OS.tell();
auto CASObj = CreateFromMcAssembler(*this, Asm, Layout, CAS, nullptr);
auto VerifyObject = [&]() -> Error {
SmallString<512> ObjectBuffer;
raw_svector_ostream ObjectOS(ObjectBuffer);
if (auto E = SerializeObjectFile(CASObj, CAS, ObjectOS))
return E;
if (!ObjectBuffer.equals(InternalBuffer))
return createStringError(
inconvertibleErrorCode(),
"CASBackend output round-trip verification error");
return Error::success();
};
if (CasIDOS)
writeCASIDBuffer(CASObj.getID(), *CasIDOS);
// If there is a callback, then just hand off the result through callback.
if (ResultCallBack) {
cantFail((*ResultCallBack)(CASObj.getID()));
if (Mode == CASBackendMode::Verify) {
if (auto E = VerifyObject())
report_fatal_error(std::move(E));
}
return 0;
}
switch (Mode) {
case CASBackendMode::CASID:
writeCASIDBuffer(CASObj.getID(), OS);
break;
case CASBackendMode::Native: {
auto E = SerializeObjectFile(CASObj, CAS, OS);
if (E)
report_fatal_error(std::move(E));
break;
}
case CASBackendMode::Verify: {
SmallString<512> ObjectBuffer;
raw_svector_ostream ObjectOS(ObjectBuffer);
auto E = SerializeObjectFile(CASObj, CAS, ObjectOS);
if (E)
report_fatal_error(std::move(E));
if (!ObjectBuffer.equals(InternalBuffer))
report_fatal_error("CASBackend output round-trip verification error");
OS << ObjectBuffer;
break;
}
}
return OS.tell() - StartOffset;
}
std::unique_ptr<MCObjectWriter> llvm::createMachOCASWriter(
std::unique_ptr<MCMachObjectTargetWriter> MOTW, const Triple &TT,
cas::ObjectStore &CAS, CASBackendMode Mode, raw_pwrite_stream &OS,
bool IsLittleEndian,
std::function<const cas::ObjectProxy(
llvm::MachOCASWriter &, llvm::MCAssembler &, const llvm::MCAsmLayout &,
cas::ObjectStore &, raw_ostream *)>
CreateFromMcAssembler,
std::function<Error(cas::ObjectProxy, cas::ObjectStore &, raw_ostream &)>
SerializeObjectFile,
std::optional<MCTargetOptions::ResultCallBackTy> ResultCallBack,
raw_pwrite_stream *CasIDOS) {
return std::make_unique<MachOCASWriter>(
std::move(MOTW), TT, CAS, Mode, OS, IsLittleEndian, CreateFromMcAssembler,
SerializeObjectFile, ResultCallBack, CasIDOS);
}
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