5f2a7fa67e
This patch is extracted from D96035, it adds support for the existing DWARFLinker functionality. What is not supported yet: 1. Types deduplication(--odr mode). 2. Modules deduplication. 3. Generation of index tables. Reland2: temporarily disabled call to "--linker llvm" for tls-variable.test and location-expression.test as it does not work properly on bigendian architecture. Differential Revision: https://reviews.llvm.org/D153268
130 lines
4.5 KiB
C++
130 lines
4.5 KiB
C++
//===- DwarfEmitterImpl.h ---------------------------------------*- 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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#ifndef LLVM_LIB_DWARFLINKERPARALLEL_DWARFEMITTERIMPL_H
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#define LLVM_LIB_DWARFLINKERPARALLEL_DWARFEMITTERIMPL_H
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#include "DWARFLinkerCompileUnit.h"
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#include "llvm/BinaryFormat/Swift.h"
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#include "llvm/CodeGen/AccelTable.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/DWARFLinkerParallel/DWARFLinker.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/Target/TargetMachine.h"
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namespace llvm {
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/// User of DwarfEmitterImpl should call initialization code
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/// for AsmPrinter:
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///
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/// InitializeAllTargetInfos();
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/// InitializeAllTargetMCs();
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/// InitializeAllTargets();
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/// InitializeAllAsmPrinters();
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template <typename DataT> class AccelTable;
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class MCCodeEmitter;
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class DWARFDebugMacro;
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namespace dwarflinker_parallel {
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/// This class emits DWARF data to the output stream. It emits already
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/// generated section data and specific data, which could not be generated
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/// by CompileUnit.
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class DwarfEmitterImpl : public ExtraDwarfEmitter {
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public:
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DwarfEmitterImpl(DWARFLinker::OutputFileType OutFileType,
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raw_pwrite_stream &OutFile)
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: OutFile(OutFile), OutFileType(OutFileType) {}
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/// Initialize AsmPrinter data.
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Error init(Triple TheTriple, StringRef Swift5ReflectionSegmentName);
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/// Returns triple of output stream.
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const Triple &getTargetTriple() { return MC->getTargetTriple(); }
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/// Dump the file to the disk.
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void finish() override { MS->finish(); }
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/// Returns AsmPrinter.
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AsmPrinter &getAsmPrinter() const override { return *Asm; }
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/// Emit the swift_ast section stored in \p Buffer.
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void emitSwiftAST(StringRef Buffer) override;
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/// Emit the swift reflection section stored in \p Buffer.
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void emitSwiftReflectionSection(
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llvm::binaryformat::Swift5ReflectionSectionKind ReflSectionKind,
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StringRef Buffer, uint32_t Alignment, uint32_t) override;
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/// Emit specified section data.
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void emitSectionContents(StringRef SecData, StringRef SecName) override;
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/// Emit temporary symbol.
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MCSymbol *emitTempSym(StringRef SecName, StringRef SymName) override;
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/// Emit abbreviations.
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void emitAbbrevs(const SmallVector<std::unique_ptr<DIEAbbrev>> &Abbrevs,
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unsigned DwarfVersion);
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/// Emit compile unit header.
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void emitCompileUnitHeader(DwarfUnit &Unit);
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/// Emit DIE recursively.
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void emitDIE(DIE &Die);
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/// Returns size of generated .debug_info section.
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uint64_t getDebugInfoSectionSize() const { return DebugInfoSectionSize; }
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private:
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// Enumerate all string patches and write them into the destination section.
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// Order of patches is the same as in original input file. To avoid emitting
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// the same string twice we accumulate NextOffset value. Thus if string
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// offset smaller than NextOffset value then the patch is skipped (as that
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// string was emitted earlier).
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template <typename PatchTy>
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void emitStringsImpl(ArrayList<PatchTy> &StringPatches,
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const StringEntryToDwarfStringPoolEntryMap &Strings,
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uint64_t &NextOffset, MCSection *OutSection);
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MCSection *switchSection(StringRef SecName);
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/// \defgroup MCObjects MC layer objects constructed by the streamer
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/// @{
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std::unique_ptr<MCRegisterInfo> MRI;
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std::unique_ptr<MCAsmInfo> MAI;
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std::unique_ptr<MCObjectFileInfo> MOFI;
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std::unique_ptr<MCContext> MC;
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MCAsmBackend *MAB; // Owned by MCStreamer
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std::unique_ptr<MCInstrInfo> MII;
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std::unique_ptr<MCSubtargetInfo> MSTI;
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MCInstPrinter *MIP; // Owned by AsmPrinter
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MCCodeEmitter *MCE; // Owned by MCStreamer
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MCStreamer *MS; // Owned by AsmPrinter
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std::unique_ptr<TargetMachine> TM;
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std::unique_ptr<AsmPrinter> Asm;
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/// @}
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/// The output file we stream the linked Dwarf to.
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raw_pwrite_stream &OutFile;
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DWARFLinker::OutputFileType OutFileType = DWARFLinker::OutputFileType::Object;
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uint64_t DebugInfoSectionSize = 0;
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};
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} // end namespace dwarflinker_parallel
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} // end namespace llvm
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#endif // LLVM_LIB_DWARFLINKERPARALLEL_DWARFEMITTERIMPL_H
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