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//===- DWARFEmitterImpl.cpp -----------------------------------------------===//
//
// 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 "DWARFEmitterImpl.h"
#include "DWARFLinkerCompileUnit.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCTargetOptions.h"
#include "llvm/MC/MCTargetOptionsCommandFlags.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Support/FormattedStream.h"
using namespace llvm;
using namespace dwarf_linker;
using namespace dwarf_linker::parallel;
Error DwarfEmitterImpl::init(Triple TheTriple,
StringRef Swift5ReflectionSegmentName) {
std::string ErrorStr;
std::string TripleName;
// Get the target.
const Target *TheTarget =
TargetRegistry::lookupTarget(TripleName, TheTriple, ErrorStr);
if (!TheTarget)
return createStringError(std::errc::invalid_argument, ErrorStr.c_str());
TripleName = TheTriple.getTriple();
// Create all the MC Objects.
MRI.reset(TheTarget->createMCRegInfo(TripleName));
if (!MRI)
return createStringError(std::errc::invalid_argument,
"no register info for target %s",
TripleName.c_str());
MCTargetOptions MCOptions = mc::InitMCTargetOptionsFromFlags();
MCOptions.AsmVerbose = true;
MCOptions.MCUseDwarfDirectory = MCTargetOptions::EnableDwarfDirectory;
MAI.reset(TheTarget->createMCAsmInfo(*MRI, TripleName, MCOptions));
if (!MAI)
return createStringError(std::errc::invalid_argument,
"no asm info for target %s", TripleName.c_str());
MSTI.reset(TheTarget->createMCSubtargetInfo(TripleName, "", ""));
if (!MSTI)
return createStringError(std::errc::invalid_argument,
"no subtarget info for target %s",
TripleName.c_str());
MC.reset(new MCContext(TheTriple, MAI.get(), MRI.get(), MSTI.get(), nullptr,
nullptr, true, Swift5ReflectionSegmentName));
MOFI.reset(TheTarget->createMCObjectFileInfo(*MC, /*PIC=*/false, false));
MC->setObjectFileInfo(MOFI.get());
MAB = TheTarget->createMCAsmBackend(*MSTI, *MRI, MCOptions);
if (!MAB)
return createStringError(std::errc::invalid_argument,
"no asm backend for target %s",
TripleName.c_str());
MII.reset(TheTarget->createMCInstrInfo());
if (!MII)
return createStringError(std::errc::invalid_argument,
"no instr info info for target %s",
TripleName.c_str());
MCE = TheTarget->createMCCodeEmitter(*MII, *MC);
if (!MCE)
return createStringError(std::errc::invalid_argument,
"no code emitter for target %s",
TripleName.c_str());
switch (OutFileType) {
case DWARFLinker::OutputFileType::Assembly: {
std::unique_ptr<MCInstPrinter> MIP(TheTarget->createMCInstPrinter(
TheTriple, MAI->getAssemblerDialect(), *MAI, *MII, *MRI));
MS = TheTarget->createAsmStreamer(
*MC, std::make_unique<formatted_raw_ostream>(OutFile), std::move(MIP),
std::unique_ptr<MCCodeEmitter>(MCE),
std::unique_ptr<MCAsmBackend>(MAB));
break;
}
case DWARFLinker::OutputFileType::Object: {
MS = TheTarget->createMCObjectStreamer(
TheTriple, *MC, std::unique_ptr<MCAsmBackend>(MAB),
MAB->createObjectWriter(OutFile), std::unique_ptr<MCCodeEmitter>(MCE),
*MSTI);
break;
}
}
if (!MS)
return createStringError(std::errc::invalid_argument,
"no object streamer for target %s",
TripleName.c_str());
// Finally create the AsmPrinter we'll use to emit the DIEs.
TM.reset(TheTarget->createTargetMachine(TheTriple, "", "", TargetOptions(),
std::nullopt));
if (!TM)
return createStringError(std::errc::invalid_argument,
"no target machine for target %s",
TripleName.c_str());
Asm.reset(TheTarget->createAsmPrinter(*TM, std::unique_ptr<MCStreamer>(MS)));
if (!Asm)
return createStringError(std::errc::invalid_argument,
"no asm printer for target %s",
TripleName.c_str());
Asm->setDwarfUsesRelocationsAcrossSections(false);
DebugInfoSectionSize = 0;
return Error::success();
}
void DwarfEmitterImpl::emitAbbrevs(
const SmallVector<std::unique_ptr<DIEAbbrev>> &Abbrevs,
unsigned DwarfVersion) {
MS->switchSection(MOFI->getDwarfAbbrevSection());
MC->setDwarfVersion(DwarfVersion);
Asm->emitDwarfAbbrevs(Abbrevs);
}
void DwarfEmitterImpl::emitCompileUnitHeader(DwarfUnit &Unit) {
MS->switchSection(MOFI->getDwarfInfoSection());
MC->setDwarfVersion(Unit.getVersion());
// Emit size of content not including length itself. The size has already
// been computed in CompileUnit::computeOffsets(). Subtract 4 to that size to
// account for the length field.
Asm->emitInt32(Unit.getUnitSize() - 4);
Asm->emitInt16(Unit.getVersion());
if (Unit.getVersion() >= 5) {
Asm->emitInt8(dwarf::DW_UT_compile);
Asm->emitInt8(Unit.getFormParams().AddrSize);
// Proper offset to the abbreviations table will be set later.
Asm->emitInt32(0);
DebugInfoSectionSize += 12;
} else {
// Proper offset to the abbreviations table will be set later.
Asm->emitInt32(0);
Asm->emitInt8(Unit.getFormParams().AddrSize);
DebugInfoSectionSize += 11;
}
}
void DwarfEmitterImpl::emitDIE(DIE &Die) {
MS->switchSection(MOFI->getDwarfInfoSection());
Asm->emitDwarfDIE(Die);
DebugInfoSectionSize += Die.getSize();
}
void DwarfEmitterImpl::emitDebugNames(DWARF5AccelTable &Table,
DebugNamesUnitsOffsets &CUOffsets,
CompUnitIDToIdx &CUidToIdx) {
if (CUOffsets.empty())
return;
Asm->OutStreamer->switchSection(MOFI->getDwarfDebugNamesSection());
dwarf::Form Form =
DIEInteger::BestForm(/*IsSigned*/ false, (uint64_t)CUidToIdx.size() - 1);
// FIXME: add support for type units + .debug_names. For now the behavior is
// unsuported.
emitDWARF5AccelTable(
Asm.get(), Table, CUOffsets,
[&](const DWARF5AccelTableData &Entry)
-> std::optional<DWARF5AccelTable::UnitIndexAndEncoding> {
if (CUidToIdx.size() > 1)
return {{CUidToIdx[Entry.getUnitID()],
{dwarf::DW_IDX_compile_unit, Form}}};
return std::nullopt;
});
}
void DwarfEmitterImpl::emitAppleNamespaces(
AccelTable<AppleAccelTableStaticOffsetData> &Table) {
Asm->OutStreamer->switchSection(MOFI->getDwarfAccelNamespaceSection());
auto *SectionBegin = Asm->createTempSymbol("namespac_begin");
Asm->OutStreamer->emitLabel(SectionBegin);
emitAppleAccelTable(Asm.get(), Table, "namespac", SectionBegin);
}
void DwarfEmitterImpl::emitAppleNames(
AccelTable<AppleAccelTableStaticOffsetData> &Table) {
Asm->OutStreamer->switchSection(MOFI->getDwarfAccelNamesSection());
auto *SectionBegin = Asm->createTempSymbol("names_begin");
Asm->OutStreamer->emitLabel(SectionBegin);
emitAppleAccelTable(Asm.get(), Table, "names", SectionBegin);
}
void DwarfEmitterImpl::emitAppleObjc(
AccelTable<AppleAccelTableStaticOffsetData> &Table) {
Asm->OutStreamer->switchSection(MOFI->getDwarfAccelObjCSection());
auto *SectionBegin = Asm->createTempSymbol("objc_begin");
Asm->OutStreamer->emitLabel(SectionBegin);
emitAppleAccelTable(Asm.get(), Table, "objc", SectionBegin);
}
void DwarfEmitterImpl::emitAppleTypes(
AccelTable<AppleAccelTableStaticTypeData> &Table) {
Asm->OutStreamer->switchSection(MOFI->getDwarfAccelTypesSection());
auto *SectionBegin = Asm->createTempSymbol("types_begin");
Asm->OutStreamer->emitLabel(SectionBegin);
emitAppleAccelTable(Asm.get(), Table, "types", SectionBegin);
}
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