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| //===- tools/dsymutil/DwarfStreamer.h - Dwarf Streamer ----------*- 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TOOLS_DSYMUTIL_DWARFSTREAMER_H
#define LLVM_TOOLS_DSYMUTIL_DWARFSTREAMER_H
#include "CompileUnit.h"
#include "DebugMap.h"
#include "LinkUtils.h"
#include "NonRelocatableStringpool.h"
#include "llvm/CodeGen/AccelTable.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugLine.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDwarf.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCTargetOptions.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
namespace llvm {
namespace dsymutil {
/// The Dwarf streaming logic.
///
/// All interactions with the MC layer that is used to build the debug
/// information binary representation are handled in this class.
class DwarfStreamer {
public:
DwarfStreamer(raw_fd_ostream &OutFile, LinkOptions Options)
: OutFile(OutFile), Options(std::move(Options)) {}
bool init(Triple TheTriple);
/// Dump the file to the disk.
bool finish(const DebugMap &, SymbolMapTranslator &T);
AsmPrinter &getAsmPrinter() const { return *Asm; }
/// Set the current output section to debug_info and change
/// the MC Dwarf version to \p DwarfVersion.
void switchToDebugInfoSection(unsigned DwarfVersion);
/// Emit the compilation unit header for \p Unit in the
/// debug_info section.
///
/// As a side effect, this also switches the current Dwarf version
/// of the MC layer to the one of U.getOrigUnit().
void emitCompileUnitHeader(CompileUnit &Unit);
/// Recursively emit the DIE tree rooted at \p Die.
void emitDIE(DIE &Die);
/// Emit the abbreviation table \p Abbrevs to the debug_abbrev section.
void emitAbbrevs(const std::vector<std::unique_ptr<DIEAbbrev>> &Abbrevs,
unsigned DwarfVersion);
/// Emit the string table described by \p Pool.
void emitStrings(const NonRelocatableStringpool &Pool);
/// Emit the swift_ast section stored in \p Buffer.
void emitSwiftAST(StringRef Buffer);
/// Emit debug_ranges for \p FuncRange by translating the
/// original \p Entries.
void emitRangesEntries(
int64_t UnitPcOffset, uint64_t OrigLowPc,
const FunctionIntervals::const_iterator &FuncRange,
const std::vector<DWARFDebugRangeList::RangeListEntry> &Entries,
unsigned AddressSize);
/// Emit debug_aranges entries for \p Unit and if \p DoRangesSection is true,
/// also emit the debug_ranges entries for the DW_TAG_compile_unit's
/// DW_AT_ranges attribute.
void emitUnitRangesEntries(CompileUnit &Unit, bool DoRangesSection);
uint32_t getRangesSectionSize() const { return RangesSectionSize; }
/// Emit the debug_loc contribution for \p Unit by copying the entries from
/// \p Dwarf and offsetting them. Update the location attributes to point to
/// the new entries.
void emitLocationsForUnit(
const CompileUnit &Unit, DWARFContext &Dwarf,
std::function<void(StringRef, SmallVectorImpl<uint8_t> &)> ProcessExpr);
/// Emit the line table described in \p Rows into the debug_line section.
void emitLineTableForUnit(MCDwarfLineTableParams Params,
StringRef PrologueBytes, unsigned MinInstLength,
std::vector<DWARFDebugLine::Row> &Rows,
unsigned AdddressSize);
/// Copy the debug_line over to the updated binary while unobfuscating the
/// file names and directories.
void translateLineTable(DataExtractor LineData, uint64_t Offset);
/// Copy over the debug sections that are not modified when updating.
void copyInvariantDebugSection(const object::ObjectFile &Obj);
uint64_t getLineSectionSize() const { return LineSectionSize; }
/// Emit the .debug_pubnames contribution for \p Unit.
void emitPubNamesForUnit(const CompileUnit &Unit);
/// Emit the .debug_pubtypes contribution for \p Unit.
void emitPubTypesForUnit(const CompileUnit &Unit);
/// Emit a CIE.
void emitCIE(StringRef CIEBytes);
/// Emit an FDE with data \p Bytes.
void emitFDE(uint32_t CIEOffset, uint32_t AddreSize, uint32_t Address,
StringRef Bytes);
/// Emit DWARF debug names.
void emitDebugNames(AccelTable<DWARF5AccelTableStaticData> &Table);
/// Emit Apple namespaces accelerator table.
void emitAppleNamespaces(AccelTable<AppleAccelTableStaticOffsetData> &Table);
/// Emit Apple names accelerator table.
void emitAppleNames(AccelTable<AppleAccelTableStaticOffsetData> &Table);
/// Emit Apple Objective-C accelerator table.
void emitAppleObjc(AccelTable<AppleAccelTableStaticOffsetData> &Table);
/// Emit Apple type accelerator table.
void emitAppleTypes(AccelTable<AppleAccelTableStaticTypeData> &Table);
uint32_t getFrameSectionSize() const { return FrameSectionSize; }
private:
/// \defgroup MCObjects MC layer objects constructed by the streamer
/// @{
std::unique_ptr<MCRegisterInfo> MRI;
std::unique_ptr<MCAsmInfo> MAI;
std::unique_ptr<MCObjectFileInfo> MOFI;
std::unique_ptr<MCContext> MC;
MCAsmBackend *MAB; // Owned by MCStreamer
std::unique_ptr<MCInstrInfo> MII;
std::unique_ptr<MCSubtargetInfo> MSTI;
MCInstPrinter *MIP; // Owned by AsmPrinter
MCCodeEmitter *MCE; // Owned by MCStreamer
MCStreamer *MS; // Owned by AsmPrinter
std::unique_ptr<TargetMachine> TM;
std::unique_ptr<AsmPrinter> Asm;
/// @}
/// The file we stream the linked Dwarf to.
raw_fd_ostream &OutFile;
LinkOptions Options;
uint32_t RangesSectionSize;
uint32_t LocSectionSize;
uint64_t LineSectionSize;
uint32_t FrameSectionSize;
/// Keep track of emitted CUs and their Unique ID.
struct EmittedUnit {
unsigned ID;
MCSymbol *LabelBegin;
};
std::vector<EmittedUnit> EmittedUnits;
/// Emit the pubnames or pubtypes section contribution for \p
/// Unit into \p Sec. The data is provided in \p Names.
void emitPubSectionForUnit(MCSection *Sec, StringRef Name,
const CompileUnit &Unit,
const std::vector<CompileUnit::AccelInfo> &Names);
};
} // end namespace dsymutil
} // end namespace llvm
#endif // LLVM_TOOLS_DSYMUTIL_DWARFSTREAMER_H
|