#include "DebugMap.h"
#include "BinaryHolder.h"
#include "DebugMap.h"
#include "dsymutil.h"
#include "MachOUtils.h"
#include "NonRelocatableStringpool.h"
#include "llvm/ADT/IntervalMap.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/DIE.h"
#include "../../lib/CodeGen/AsmPrinter/DwarfAccelTable.h"
#include "llvm/Config/config.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugInfoEntry.h"
#include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCDwarf.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCObjectStreamer.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/Object/MachO.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include <string>
#include <tuple>
namespace llvm {
namespace dsymutil {
namespace {
class StaticDIEDwarfAccelTable : public DwarfAccelTable {
public:
StaticDIEDwarfAccelTable();
void AddName(DwarfStringPoolEntryRef Name, uint32_t DieOffset);
};
class StaticDIEHashDataContents : public DwarfAccelTable::HashDataContents {
uint32_t DieOffset;
public:
StaticDIEHashDataContents(uint32_t DieOffset) : DieOffset(DieOffset) {}
void emit(AsmPrinter *Asm, DwarfDebug *D) const override {
Asm->EmitInt32(DieOffset);
}
bool less(const HashDataContents *HD) const override {
const auto *Other = static_cast<const StaticDIEHashDataContents *>(HD);
return DieOffset < Other->DieOffset;
}
void print(raw_ostream &OS) const override {
OS << " Static Offset: " << DieOffset << "\n";
}
};
StaticDIEDwarfAccelTable::StaticDIEDwarfAccelTable()
: DwarfAccelTable(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
dwarf::DW_FORM_data4)) {}
void StaticDIEDwarfAccelTable::AddName(DwarfStringPoolEntryRef Name,
uint32_t DieOffset) {
assert(Data.empty() && "Already finalized!");
DataArray &DIEs = Entries[Name.getString()];
assert(!DIEs.Name || DIEs.Name == Name);
DIEs.Name = Name;
HashDataContents *HD;
HD = new (Allocator) StaticDIEHashDataContents(DieOffset);
DIEs.Values.push_back(HD);
}
class StaticTypeDwarfAccelTable : public DwarfAccelTable {
public:
StaticTypeDwarfAccelTable();
void AddType(DwarfStringPoolEntryRef Name, uint32_t DieOffset, uint16_t Tag,
bool ObjCClassIsImplementation, uint32_t QualifiedNameHash);
};
class StaticTypeHashDataContents : public DwarfAccelTable::HashDataContents {
uint32_t DieOffset;
uint32_t QualifiedNameHash;
uint16_t Tag;
bool ObjCClassIsImplementation;
public:
StaticTypeHashDataContents(uint32_t DieOffset, uint16_t Tag,
bool ObjCClassIsImplementation,
uint32_t QualifiedNameHash)
: DieOffset(DieOffset), QualifiedNameHash(QualifiedNameHash), Tag(Tag),
ObjCClassIsImplementation(ObjCClassIsImplementation) {}
void emit(AsmPrinter *Asm, DwarfDebug *D) const override {
Asm->EmitInt32(DieOffset);
Asm->EmitInt16(Tag);
Asm->EmitInt8(ObjCClassIsImplementation ? dwarf::DW_FLAG_type_implementation : 0);
Asm->EmitInt32(QualifiedNameHash);
}
bool less(const HashDataContents *HD) const override {
const auto *Other = static_cast<const StaticTypeHashDataContents *>(HD);
return DieOffset < Other->DieOffset;
}
void print(raw_ostream &OS) const override {
OS << " Static Offset: " << DieOffset << ' ' << dwarf::TagString(Tag)
<< ' ' << (ObjCClassIsImplementation ? "ObjcClassImplementation" : "")
<< ' ' << format("%x\n", QualifiedNameHash);
}
};
static LLVM_CONSTEXPR DwarfAccelTable::Atom TypeAtoms[] = {
DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset, dwarf::DW_FORM_data4),
DwarfAccelTable::Atom(dwarf::DW_ATOM_die_tag, dwarf::DW_FORM_data2),
DwarfAccelTable::Atom(5, dwarf::DW_FORM_data1),
DwarfAccelTable::Atom(6, dwarf::DW_FORM_data4)};
StaticTypeDwarfAccelTable::StaticTypeDwarfAccelTable()
: DwarfAccelTable(makeArrayRef(TypeAtoms)) {}
void StaticTypeDwarfAccelTable::AddType(DwarfStringPoolEntryRef Name,
uint32_t DieOffset, uint16_t Tag,
bool ObjCClassIsImplementation,
uint32_t QualifiedNameHash) {
assert(Data.empty() && "Already finalized!");
DataArray &DIEs = Entries[Name.getString()];
assert(!DIEs.Name || DIEs.Name == Name);
DIEs.Name = Name;
HashDataContents *HD;
HD = new (Allocator) StaticTypeHashDataContents(
DieOffset, Tag, ObjCClassIsImplementation, QualifiedNameHash);
DIEs.Values.push_back(HD);
}
Optional<object::SectionRef> getSectionByName(const object::ObjectFile &Obj,
StringRef SecName) {
for (const object::SectionRef &Section : Obj.sections()) {
StringRef SectionName;
Section.getName(SectionName);
SectionName = SectionName.substr(SectionName.find_first_not_of("._"));
if (SectionName != SecName)
continue;
return Section;
}
return None;
}
template <typename KeyT, typename ValT>
using HalfOpenIntervalMap =
IntervalMap<KeyT, ValT, IntervalMapImpl::NodeSizer<KeyT, ValT>::LeafSize,
IntervalMapHalfOpenInfo<KeyT>>;
typedef HalfOpenIntervalMap<uint64_t, int64_t> FunctionIntervals;
struct PatchLocation {
DIE::value_iterator I;
PatchLocation() = default;
PatchLocation(DIE::value_iterator I) : I(I) {}
void set(uint64_t New) const {
assert(I);
const auto &Old = *I;
assert(Old.getType() == DIEValue::isInteger);
*I = DIEValue(Old.getAttribute(), Old.getForm(), DIEInteger(New));
}
uint64_t get() const {
assert(I);
return I->getDIEInteger().getValue();
}
};
class CompileUnit;
struct DeclMapInfo;
class DeclContext {
unsigned QualifiedNameHash;
uint32_t Line;
uint32_t ByteSize;
uint16_t Tag;
StringRef Name;
StringRef File;
const DeclContext &Parent;
const DWARFDebugInfoEntryMinimal *LastSeenDIE;
uint32_t LastSeenCompileUnitID;
uint32_t CanonicalDIEOffset;
friend DeclMapInfo;
public:
typedef DenseSet<DeclContext *, DeclMapInfo> Map;
DeclContext()
: QualifiedNameHash(0), Line(0), ByteSize(0),
Tag(dwarf::DW_TAG_compile_unit), Name(), File(), Parent(*this),
LastSeenDIE(nullptr), LastSeenCompileUnitID(0), CanonicalDIEOffset(0) {}
DeclContext(unsigned Hash, uint32_t Line, uint32_t ByteSize, uint16_t Tag,
StringRef Name, StringRef File, const DeclContext &Parent,
const DWARFDebugInfoEntryMinimal *LastSeenDIE = nullptr,
unsigned CUId = 0)
: QualifiedNameHash(Hash), Line(Line), ByteSize(ByteSize), Tag(Tag),
Name(Name), File(File), Parent(Parent), LastSeenDIE(LastSeenDIE),
LastSeenCompileUnitID(CUId), CanonicalDIEOffset(0) {}
uint32_t getQualifiedNameHash() const { return QualifiedNameHash; }
bool setLastSeenDIE(CompileUnit &U, const DWARFDebugInfoEntryMinimal *Die);
uint32_t getCanonicalDIEOffset() const { return CanonicalDIEOffset; }
void setCanonicalDIEOffset(uint32_t Offset) { CanonicalDIEOffset = Offset; }
uint16_t getTag() const { return Tag; }
StringRef getName() const { return Name; }
};
struct DeclMapInfo : private DenseMapInfo<DeclContext *> {
using DenseMapInfo<DeclContext *>::getEmptyKey;
using DenseMapInfo<DeclContext *>::getTombstoneKey;
static unsigned getHashValue(const DeclContext *Ctxt) {
return Ctxt->QualifiedNameHash;
}
static bool isEqual(const DeclContext *LHS, const DeclContext *RHS) {
if (RHS == getEmptyKey() || RHS == getTombstoneKey())
return RHS == LHS;
return LHS->QualifiedNameHash == RHS->QualifiedNameHash &&
LHS->Line == RHS->Line && LHS->ByteSize == RHS->ByteSize &&
LHS->Name.data() == RHS->Name.data() &&
LHS->File.data() == RHS->File.data() &&
LHS->Parent.QualifiedNameHash == RHS->Parent.QualifiedNameHash;
}
};
class DeclContextTree {
BumpPtrAllocator Allocator;
DeclContext Root;
DeclContext::Map Contexts;
public:
PointerIntPair<DeclContext *, 1>
getChildDeclContext(DeclContext &Context,
const DWARFDebugInfoEntryMinimal *DIE, CompileUnit &Unit,
NonRelocatableStringpool &StringPool, bool InClangModule);
DeclContext &getRoot() { return Root; }
};
class CompileUnit {
public:
struct DIEInfo {
int64_t AddrAdjust; DeclContext *Ctxt; DIE *Clone; uint32_t ParentIdx; bool Keep : 1; bool InDebugMap : 1; bool Prune : 1; };
CompileUnit(DWARFUnit &OrigUnit, unsigned ID, bool CanUseODR,
StringRef ClangModuleName)
: OrigUnit(OrigUnit), ID(ID), CUDie(nullptr), LowPc(UINT64_MAX), HighPc(0),
RangeAlloc(), Ranges(RangeAlloc), ClangModuleName(ClangModuleName) {
Info.resize(OrigUnit.getNumDIEs());
const auto *CUDie = OrigUnit.getUnitDIE(false);
if (!CUDie) {
HasODR = false;
return;
}
unsigned Lang = CUDie->getAttributeValueAsUnsignedConstant(
&OrigUnit, dwarf::DW_AT_language, 0);
HasODR = CanUseODR && (Lang == dwarf::DW_LANG_C_plus_plus ||
Lang == dwarf::DW_LANG_C_plus_plus_03 ||
Lang == dwarf::DW_LANG_C_plus_plus_11 ||
Lang == dwarf::DW_LANG_C_plus_plus_14 ||
Lang == dwarf::DW_LANG_ObjC_plus_plus);
}
CompileUnit(CompileUnit &&RHS)
: OrigUnit(RHS.OrigUnit), Info(std::move(RHS.Info)),
CUDie(std::move(RHS.CUDie)), StartOffset(RHS.StartOffset),
NextUnitOffset(RHS.NextUnitOffset), RangeAlloc(), Ranges(RangeAlloc) {
llvm_unreachable("CompileUnits should not be moved.");
}
DWARFUnit &getOrigUnit() const { return OrigUnit; }
unsigned getUniqueID() const { return ID; }
DIE *getOutputUnitDIE() const { return CUDie; }
void setOutputUnitDIE(DIE *Die) { CUDie = Die; }
bool hasODR() const { return HasODR; }
bool isClangModule() const { return !ClangModuleName.empty(); }
const std::string &getClangModuleName() const { return ClangModuleName; }
DIEInfo &getInfo(unsigned Idx) { return Info[Idx]; }
const DIEInfo &getInfo(unsigned Idx) const { return Info[Idx]; }
uint64_t getStartOffset() const { return StartOffset; }
uint64_t getNextUnitOffset() const { return NextUnitOffset; }
void setStartOffset(uint64_t DebugInfoSize) { StartOffset = DebugInfoSize; }
uint64_t getLowPc() const { return LowPc; }
uint64_t getHighPc() const { return HighPc; }
bool hasLabelAt(uint64_t Addr) const { return Labels.count(Addr); }
Optional<PatchLocation> getUnitRangesAttribute() const {
return UnitRangeAttribute;
}
const FunctionIntervals &getFunctionRanges() const { return Ranges; }
const std::vector<PatchLocation> &getRangesAttributes() const {
return RangeAttributes;
}
const std::vector<std::pair<PatchLocation, int64_t>> &
getLocationAttributes() const {
return LocationAttributes;
}
void setHasInterestingContent() { HasInterestingContent = true; }
bool hasInterestingContent() { return HasInterestingContent; }
void markEverythingAsKept();
uint64_t computeNextUnitOffset();
void noteForwardReference(DIE *Die, const CompileUnit *RefUnit,
DeclContext *Ctxt, PatchLocation Attr);
void fixupForwardReferences();
void addLabelLowPc(uint64_t LabelLowPc, int64_t PcOffset);
void addFunctionRange(uint64_t LowPC, uint64_t HighPC, int64_t PCOffset);
void noteRangeAttribute(const DIE &Die, PatchLocation Attr);
void noteLocationAttribute(PatchLocation Attr, int64_t PcOffset);
void addObjCAccelerator(const DIE *Die, DwarfStringPoolEntryRef Name,
bool SkipPubnamesSection = false);
void addNameAccelerator(const DIE *Die, DwarfStringPoolEntryRef Name,
bool SkipPubnamesSection = false);
void addTypeAccelerator(const DIE *Die, DwarfStringPoolEntryRef Name,
bool ObjcClassImplementation,
uint32_t QualifiedNameHash);
void addNamespaceAccelerator(const DIE *Die, DwarfStringPoolEntryRef Name);
struct AccelInfo {
DwarfStringPoolEntryRef Name; const DIE *Die; uint32_t QualifiedNameHash; bool SkipPubSection; bool ObjcClassImplementation; AccelInfo(DwarfStringPoolEntryRef Name, const DIE *Die,
bool SkipPubSection = false)
: Name(Name), Die(Die), SkipPubSection(SkipPubSection) {}
AccelInfo(DwarfStringPoolEntryRef Name, const DIE *Die,
uint32_t QualifiedNameHash, bool ObjCClassIsImplementation)
: Name(Name), Die(Die), QualifiedNameHash(QualifiedNameHash),
SkipPubSection(false),
ObjcClassImplementation(ObjCClassIsImplementation) {}
};
const std::vector<AccelInfo> &getPubnames() const { return Pubnames; }
const std::vector<AccelInfo> &getPubtypes() const { return Pubtypes; }
const std::vector<AccelInfo> &getNamespaces() const { return Namespaces; }
const std::vector<AccelInfo> &getObjC() const { return ObjC; }
const char *getResolvedPath(unsigned FileNum) {
if (FileNum >= ResolvedPaths.size())
return nullptr;
return ResolvedPaths[FileNum].size() ? ResolvedPaths[FileNum].c_str()
: nullptr;
}
void setResolvedPath(unsigned FileNum, const std::string &Path) {
if (ResolvedPaths.size() <= FileNum)
ResolvedPaths.resize(FileNum + 1);
ResolvedPaths[FileNum] = Path;
}
private:
DWARFUnit &OrigUnit;
unsigned ID;
std::vector<DIEInfo> Info; DIE *CUDie;
uint64_t StartOffset;
uint64_t NextUnitOffset;
uint64_t LowPc;
uint64_t HighPc;
std::vector<std::tuple<DIE *, const CompileUnit *, DeclContext *,
PatchLocation>> ForwardDIEReferences;
FunctionIntervals::Allocator RangeAlloc;
FunctionIntervals Ranges;
SmallDenseMap<uint64_t, uint64_t, 1> Labels;
std::vector<PatchLocation> RangeAttributes;
Optional<PatchLocation> UnitRangeAttribute;
std::vector<std::pair<PatchLocation, int64_t>> LocationAttributes;
std::vector<AccelInfo> Pubnames;
std::vector<AccelInfo> Pubtypes;
std::vector<AccelInfo> Namespaces;
std::vector<AccelInfo> ObjC;
std::vector<std::string> ResolvedPaths;
bool HasODR;
bool HasInterestingContent;
std::string ClangModuleName;
};
static bool inFunctionScope(CompileUnit &U, unsigned Idx) {
if (Idx == 0)
return false;
if (U.getOrigUnit().getDIEAtIndex(Idx)->getTag() == dwarf::DW_TAG_subprogram)
return true;
return inFunctionScope(U, U.getInfo(Idx).ParentIdx);
}
void CompileUnit::markEverythingAsKept() {
unsigned Idx = 0;
setHasInterestingContent();
for (auto &I : Info) {
I.Keep = !I.Prune;
const auto *DIE = OrigUnit.getDIEAtIndex(Idx++);
if (DIE->getTag() != dwarf::DW_TAG_variable &&
DIE->getTag() != dwarf::DW_TAG_constant)
continue;
DWARFFormValue Value;
if (!DIE->getAttributeValue(&OrigUnit, dwarf::DW_AT_location, Value)) {
if (DIE->getAttributeValue(&OrigUnit, dwarf::DW_AT_const_value, Value) &&
!inFunctionScope(*this, I.ParentIdx))
I.InDebugMap = true;
continue;
}
if (auto Block = Value.getAsBlock()) {
if (Block->size() >= OrigUnit.getAddressByteSize() + 1 &&
(*Block)[0] == dwarf::DW_OP_addr)
I.InDebugMap = true;
}
}
}
uint64_t CompileUnit::computeNextUnitOffset() {
NextUnitOffset = StartOffset + 11 ;
if (CUDie)
NextUnitOffset += CUDie->getSize();
return NextUnitOffset;
}
void CompileUnit::noteForwardReference(DIE *Die, const CompileUnit *RefUnit,
DeclContext *Ctxt, PatchLocation Attr) {
ForwardDIEReferences.emplace_back(Die, RefUnit, Ctxt, Attr);
}
void CompileUnit::fixupForwardReferences() {
for (const auto &Ref : ForwardDIEReferences) {
DIE *RefDie;
const CompileUnit *RefUnit;
PatchLocation Attr;
DeclContext *Ctxt;
std::tie(RefDie, RefUnit, Ctxt, Attr) = Ref;
if (Ctxt && Ctxt->getCanonicalDIEOffset())
Attr.set(Ctxt->getCanonicalDIEOffset());
else
Attr.set(RefDie->getOffset() + RefUnit->getStartOffset());
}
}
void CompileUnit::addLabelLowPc(uint64_t LabelLowPc, int64_t PcOffset) {
Labels.insert({LabelLowPc, PcOffset});
}
void CompileUnit::addFunctionRange(uint64_t FuncLowPc, uint64_t FuncHighPc,
int64_t PcOffset) {
Ranges.insert(FuncLowPc, FuncHighPc, PcOffset);
this->LowPc = std::min(LowPc, FuncLowPc + PcOffset);
this->HighPc = std::max(HighPc, FuncHighPc + PcOffset);
}
void CompileUnit::noteRangeAttribute(const DIE &Die, PatchLocation Attr) {
if (Die.getTag() != dwarf::DW_TAG_compile_unit)
RangeAttributes.push_back(Attr);
else
UnitRangeAttribute = Attr;
}
void CompileUnit::noteLocationAttribute(PatchLocation Attr, int64_t PcOffset) {
LocationAttributes.emplace_back(Attr, PcOffset);
}
void CompileUnit::addObjCAccelerator(const DIE *Die,
DwarfStringPoolEntryRef Name,
bool SkipPubSection) {
ObjC.emplace_back(Name, Die, SkipPubSection);
}
void CompileUnit::addNameAccelerator(const DIE *Die,
DwarfStringPoolEntryRef Name,
bool SkipPubSection) {
Pubnames.emplace_back(Name, Die, SkipPubSection);
}
void CompileUnit::addTypeAccelerator(const DIE *Die,
DwarfStringPoolEntryRef Name,
bool ObjcClassImplementation,
uint32_t QualifiedNameHash) {
Pubtypes.emplace_back(Name, Die, QualifiedNameHash, ObjcClassImplementation);
}
void CompileUnit::addNamespaceAccelerator(const DIE *Die,
DwarfStringPoolEntryRef Name) {
Namespaces.emplace_back(Name, Die);
}
class DwarfStreamer {
std::unique_ptr<MCRegisterInfo> MRI;
std::unique_ptr<MCAsmInfo> MAI;
std::unique_ptr<MCObjectFileInfo> MOFI;
std::unique_ptr<MCContext> MC;
MCAsmBackend *MAB; std::unique_ptr<MCInstrInfo> MII;
std::unique_ptr<MCSubtargetInfo> MSTI;
MCCodeEmitter *MCE; MCStreamer *MS; std::unique_ptr<TargetMachine> TM;
std::unique_ptr<AsmPrinter> Asm;
std::unique_ptr<raw_fd_ostream> OutFile;
uint32_t RangesSectionSize;
uint32_t LocSectionSize;
uint32_t LineSectionSize;
uint32_t FrameSectionSize;
void emitPubSectionForUnit(MCSection *Sec, StringRef Name,
const CompileUnit &Unit,
const std::vector<CompileUnit::AccelInfo> &Names);
public:
bool init(Triple TheTriple, StringRef OutputFilename);
bool finish(const DebugMap &, NonRelocatableStringpool::TranslatorTy T);
AsmPrinter &getAsmPrinter() const { return *Asm; }
void switchToDebugInfoSection(unsigned DwarfVersion);
void emitCompileUnitHeader(CompileUnit &Unit);
void emitDIE(DIE &Die);
void emitAbbrevs(const std::vector<std::unique_ptr<DIEAbbrev>> &Abbrevs);
void emitStrings(const NonRelocatableStringpool &Pool);
void emitRangesEntries(
int64_t UnitPcOffset, uint64_t OrigLowPc,
FunctionIntervals::const_iterator FuncRange,
const std::vector<DWARFDebugRangeList::RangeListEntry> &Entries,
unsigned AddressSize);
void emitUnitRangesEntries(CompileUnit &Unit, bool DoRangesSection);
uint32_t getRangesSectionSize() const { return RangesSectionSize; }
void emitLocationsForUnit(const CompileUnit &Unit, DWARFContext &Dwarf);
void emitLineTableForUnit(MCDwarfLineTableParams Params,
StringRef PrologueBytes, unsigned MinInstLength,
std::vector<DWARFDebugLine::Row> &Rows,
unsigned AdddressSize);
void copyInvariantDebugSection(const object::ObjectFile &Obj, LinkOptions &);
void translateLineTable(DataExtractor LineData, uint32_t Offset,
LinkOptions &Options);
uint32_t getLineSectionSize() const { return LineSectionSize; }
void emitPubNamesForUnit(const CompileUnit &Unit);
void emitPubTypesForUnit(const CompileUnit &Unit);
void emitCIE(StringRef CIEBytes);
void emitFDE(uint32_t CIEOffset, uint32_t AddreSize, uint32_t Address,
StringRef Bytes);
void emitAppleNamespaces(StaticDIEDwarfAccelTable &Table);
void emitAppleNames(StaticDIEDwarfAccelTable &Table);
void emitAppleTypes(StaticTypeDwarfAccelTable &Table);
void emitAppleObjc(StaticDIEDwarfAccelTable &Table);
void emitSwiftModule(StringRef Buffer);
uint32_t getFrameSectionSize() const { return FrameSectionSize; }
};
bool DwarfStreamer::init(Triple TheTriple, StringRef OutputFilename) {
std::string ErrorStr;
std::string TripleName;
StringRef Context = "dwarf streamer init";
const Target *TheTarget =
TargetRegistry::lookupTarget(TripleName, TheTriple, ErrorStr);
if (!TheTarget)
return error(ErrorStr, Context);
TripleName = TheTriple.getTriple();
MRI.reset(TheTarget->createMCRegInfo(TripleName));
if (!MRI)
return error(Twine("no register info for target ") + TripleName, Context);
MAI.reset(TheTarget->createMCAsmInfo(*MRI, TripleName));
if (!MAI)
return error("no asm info for target " + TripleName, Context);
MOFI.reset(new MCObjectFileInfo);
MC.reset(new MCContext(MAI.get(), MRI.get(), MOFI.get()));
MOFI->InitMCObjectFileInfo(TheTriple, Reloc::Default, CodeModel::Default,
*MC);
MAB = TheTarget->createMCAsmBackend(*MRI, TripleName, "");
if (!MAB)
return error("no asm backend for target " + TripleName, Context);
MII.reset(TheTarget->createMCInstrInfo());
if (!MII)
return error("no instr info info for target " + TripleName, Context);
MSTI.reset(TheTarget->createMCSubtargetInfo(TripleName, "", ""));
if (!MSTI)
return error("no subtarget info for target " + TripleName, Context);
MCE = TheTarget->createMCCodeEmitter(*MII, *MRI, *MC);
if (!MCE)
return error("no code emitter for target " + TripleName, Context);
std::error_code EC;
OutFile =
llvm::make_unique<raw_fd_ostream>(OutputFilename, EC, sys::fs::F_None);
if (EC)
return error(Twine(OutputFilename) + ": " + EC.message(), Context);
MS = TheTarget->createMCObjectStreamer(TheTriple, *MC, *MAB, *OutFile, MCE,
*MSTI, false,
false);
if (!MS)
return error("no object streamer for target " + TripleName, Context);
TM.reset(TheTarget->createTargetMachine(TripleName, "", "", TargetOptions()));
if (!TM)
return error("no target machine for target " + TripleName, Context);
Asm.reset(TheTarget->createAsmPrinter(*TM, std::unique_ptr<MCStreamer>(MS)));
if (!Asm)
return error("no asm printer for target " + TripleName, Context);
RangesSectionSize = 0;
LocSectionSize = 0;
LineSectionSize = 0;
FrameSectionSize = 0;
return true;
}
bool DwarfStreamer::finish(const DebugMap &DM,
NonRelocatableStringpool::TranslatorTy T) {
if (DM.getTriple().isOSDarwin() && !DM.getBinaryPath().empty())
return MachOUtils::generateDsymCompanion(DM, T, *MS, *OutFile);
MS->Finish();
return true;
}
void DwarfStreamer::switchToDebugInfoSection(unsigned DwarfVersion) {
MS->SwitchSection(MOFI->getDwarfInfoSection());
MC->setDwarfVersion(DwarfVersion);
}
void DwarfStreamer::emitCompileUnitHeader(CompileUnit &Unit) {
unsigned Version = Unit.getOrigUnit().getVersion();
switchToDebugInfoSection(Version);
Asm->EmitInt32(Unit.getNextUnitOffset() - Unit.getStartOffset() - 4);
Asm->EmitInt16(Version);
Asm->EmitInt32(0);
Asm->EmitInt8(Unit.getOrigUnit().getAddressByteSize());
}
void DwarfStreamer::emitAbbrevs(
const std::vector<std::unique_ptr<DIEAbbrev>> &Abbrevs) {
MS->SwitchSection(MOFI->getDwarfAbbrevSection());
Asm->emitDwarfAbbrevs(Abbrevs);
}
void DwarfStreamer::emitDIE(DIE &Die) {
MS->SwitchSection(MOFI->getDwarfInfoSection());
Asm->emitDwarfDIE(Die);
}
void DwarfStreamer::emitStrings(const NonRelocatableStringpool &Pool) {
Asm->OutStreamer->SwitchSection(MOFI->getDwarfStrSection());
std::vector<DwarfStringPoolEntryRef> Entries = Pool.getEntries();
for (auto Entry : Entries) {
if (Entry.getIndex() == -1U)
break;
Asm->OutStreamer->EmitBytes(
StringRef(Entry.getString().data(), Entry.getString().size() + 1));
}
}
void DwarfStreamer::emitAppleNamespaces(StaticDIEDwarfAccelTable &Table) {
Asm->OutStreamer->SwitchSection(MOFI->getDwarfAccelNamespaceSection());
Table.FinalizeTable(Asm.get(), "namespac");
auto *SectionBegin = Asm->createTempSymbol("namespac_begin");
Asm->OutStreamer->EmitLabel(SectionBegin);
Table.emit(Asm.get(), SectionBegin, nullptr);
}
void DwarfStreamer::emitAppleNames(StaticDIEDwarfAccelTable &Table) {
Asm->OutStreamer->SwitchSection(MOFI->getDwarfAccelNamesSection());
Table.FinalizeTable(Asm.get(), "names");
auto *SectionBegin = Asm->createTempSymbol("names_begin");
Asm->OutStreamer->EmitLabel(SectionBegin);
Table.emit(Asm.get(), SectionBegin, nullptr);
}
void DwarfStreamer::emitAppleTypes(StaticTypeDwarfAccelTable &Table) {
Asm->OutStreamer->SwitchSection(MOFI->getDwarfAccelTypesSection());
Table.FinalizeTable(Asm.get(), "types");
auto *SectionBegin = Asm->createTempSymbol("types_begin");
Asm->OutStreamer->EmitLabel(SectionBegin);
Table.emit(Asm.get(), SectionBegin, nullptr);
}
void DwarfStreamer::emitAppleObjc(StaticDIEDwarfAccelTable &Table) {
Asm->OutStreamer->SwitchSection(MOFI->getDwarfAccelObjCSection());
Table.FinalizeTable(Asm.get(), "objc");
auto *SectionBegin = Asm->createTempSymbol("objc_begin");
Asm->OutStreamer->EmitLabel(SectionBegin);
Table.emit(Asm.get(), SectionBegin, nullptr);
}
void DwarfStreamer::emitRangesEntries(
int64_t UnitPcOffset, uint64_t OrigLowPc,
FunctionIntervals::const_iterator FuncRange,
const std::vector<DWARFDebugRangeList::RangeListEntry> &Entries,
unsigned AddressSize) {
MS->SwitchSection(MC->getObjectFileInfo()->getDwarfRangesSection());
int64_t PcOffset = Entries.empty() ? 0 : FuncRange.value() + UnitPcOffset;
for (const auto &Range : Entries) {
if (Range.isBaseAddressSelectionEntry(AddressSize)) {
warn("unsupported base address selection operation",
"emitting debug_ranges");
break;
}
if (Range.StartAddress == Range.EndAddress)
continue;
if (!(Range.StartAddress + OrigLowPc >= FuncRange.start() &&
Range.EndAddress + OrigLowPc <= FuncRange.stop()))
warn("inconsistent range data.", "emitting debug_ranges");
MS->EmitIntValue(Range.StartAddress + PcOffset, AddressSize);
MS->EmitIntValue(Range.EndAddress + PcOffset, AddressSize);
RangesSectionSize += 2 * AddressSize;
}
MS->EmitIntValue(0, AddressSize);
MS->EmitIntValue(0, AddressSize);
RangesSectionSize += 2 * AddressSize;
}
void DwarfStreamer::emitUnitRangesEntries(CompileUnit &Unit,
bool DoDebugRanges) {
unsigned AddressSize = Unit.getOrigUnit().getAddressByteSize();
std::vector<std::pair<uint64_t, uint64_t>> Ranges;
const auto &FunctionRanges = Unit.getFunctionRanges();
for (auto Range = FunctionRanges.begin(), End = FunctionRanges.end();
Range != End; ++Range)
Ranges.push_back(std::make_pair(Range.start() + Range.value(),
Range.stop() + Range.value()));
std::sort(Ranges.begin(), Ranges.end());
if (!Ranges.empty()) {
MS->SwitchSection(MC->getObjectFileInfo()->getDwarfARangesSection());
MCSymbol *BeginLabel = Asm->createTempSymbol("Barange");
MCSymbol *EndLabel = Asm->createTempSymbol("Earange");
unsigned HeaderSize =
sizeof(int32_t) + sizeof(int16_t) + sizeof(int32_t) + sizeof(int8_t) + sizeof(int8_t);
unsigned TupleSize = AddressSize * 2;
unsigned Padding = OffsetToAlignment(HeaderSize, TupleSize);
Asm->EmitLabelDifference(EndLabel, BeginLabel, 4); Asm->OutStreamer->EmitLabel(BeginLabel);
Asm->EmitInt16(dwarf::DW_ARANGES_VERSION); Asm->EmitInt32(Unit.getStartOffset()); Asm->EmitInt8(AddressSize); Asm->EmitInt8(0);
Asm->OutStreamer->EmitFill(Padding, 0x0);
for (auto Range = Ranges.begin(), End = Ranges.end(); Range != End;
++Range) {
uint64_t RangeStart = Range->first;
MS->EmitIntValue(RangeStart, AddressSize);
while ((Range + 1) != End && Range->second == (Range + 1)->first)
++Range;
MS->EmitIntValue(Range->second - RangeStart, AddressSize);
}
Asm->OutStreamer->EmitIntValue(0, AddressSize);
Asm->OutStreamer->EmitIntValue(0, AddressSize);
Asm->OutStreamer->EmitLabel(EndLabel);
}
if (!DoDebugRanges)
return;
MS->SwitchSection(MC->getObjectFileInfo()->getDwarfRangesSection());
int64_t PcOffset = -Unit.getLowPc();
for (auto Range = Ranges.begin(), End = Ranges.end(); Range != End; ++Range) {
MS->EmitIntValue(Range->first + PcOffset, AddressSize);
while (Range + 1 != End && Range->second == (Range + 1)->first)
++Range;
MS->EmitIntValue(Range->second + PcOffset, AddressSize);
RangesSectionSize += 2 * AddressSize;
}
MS->EmitIntValue(0, AddressSize);
MS->EmitIntValue(0, AddressSize);
RangesSectionSize += 2 * AddressSize;
}
void DwarfStreamer::emitLocationsForUnit(const CompileUnit &Unit,
DWARFContext &Dwarf) {
const auto &Attributes = Unit.getLocationAttributes();
if (Attributes.empty())
return;
MS->SwitchSection(MC->getObjectFileInfo()->getDwarfLocSection());
unsigned AddressSize = Unit.getOrigUnit().getAddressByteSize();
const DWARFSection &InputSec = Dwarf.getLocSection();
DataExtractor Data(InputSec.Data, Dwarf.isLittleEndian(), AddressSize);
DWARFUnit &OrigUnit = Unit.getOrigUnit();
const auto *OrigUnitDie = OrigUnit.getUnitDIE(false);
int64_t UnitPcOffset = 0;
uint64_t OrigLowPc = OrigUnitDie->getAttributeValueAsAddress(
&OrigUnit, dwarf::DW_AT_low_pc, -1ULL);
if (OrigLowPc != -1ULL)
UnitPcOffset = int64_t(OrigLowPc) - Unit.getLowPc();
for (const auto &Attr : Attributes) {
uint32_t Offset = Attr.first.get();
Attr.first.set(LocSectionSize);
int64_t LocPcOffset = Attr.second + UnitPcOffset;
while (Data.isValidOffset(Offset)) {
uint64_t Low = Data.getUnsigned(&Offset, AddressSize);
uint64_t High = Data.getUnsigned(&Offset, AddressSize);
LocSectionSize += 2 * AddressSize;
if (Low == 0 && High == 0) {
Asm->OutStreamer->EmitIntValue(0, AddressSize);
Asm->OutStreamer->EmitIntValue(0, AddressSize);
break;
}
Asm->OutStreamer->EmitIntValue(Low + LocPcOffset, AddressSize);
Asm->OutStreamer->EmitIntValue(High + LocPcOffset, AddressSize);
uint64_t Length = Data.getU16(&Offset);
Asm->OutStreamer->EmitIntValue(Length, 2);
Asm->OutStreamer->EmitBytes(
StringRef(InputSec.Data.substr(Offset, Length)));
Offset += Length;
LocSectionSize += Length + 2;
}
}
}
void DwarfStreamer::emitLineTableForUnit(MCDwarfLineTableParams Params,
StringRef PrologueBytes,
unsigned MinInstLength,
std::vector<DWARFDebugLine::Row> &Rows,
unsigned PointerSize) {
MS->SwitchSection(MC->getObjectFileInfo()->getDwarfLineSection());
MCSymbol *LineStartSym = MC->createTempSymbol();
MCSymbol *LineEndSym = MC->createTempSymbol();
Asm->EmitLabelDifference(LineEndSym, LineStartSym, 4);
Asm->OutStreamer->EmitLabel(LineStartSym);
MS->EmitBytes(PrologueBytes);
LineSectionSize += PrologueBytes.size() + 4;
SmallString<128> EncodingBuffer;
raw_svector_ostream EncodingOS(EncodingBuffer);
if (Rows.empty()) {
MCDwarfLineAddr::Encode(*MC, Params, INT64_MAX, 0, EncodingOS);
MS->EmitBytes(EncodingOS.str());
LineSectionSize += EncodingBuffer.size();
MS->EmitLabel(LineEndSym);
return;
}
unsigned FileNum = 1;
unsigned LastLine = 1;
unsigned Column = 0;
unsigned IsStatement = 1;
unsigned Isa = 0;
uint64_t Address = -1ULL;
unsigned RowsSinceLastSequence = 0;
for (unsigned Idx = 0; Idx < Rows.size(); ++Idx) {
auto &Row = Rows[Idx];
int64_t AddressDelta;
if (Address == -1ULL) {
MS->EmitIntValue(dwarf::DW_LNS_extended_op, 1);
MS->EmitULEB128IntValue(PointerSize + 1);
MS->EmitIntValue(dwarf::DW_LNE_set_address, 1);
MS->EmitIntValue(Row.Address, PointerSize);
LineSectionSize += 2 + PointerSize + getULEB128Size(PointerSize + 1);
AddressDelta = 0;
} else {
AddressDelta = (Row.Address - Address) / MinInstLength;
}
if (FileNum != Row.File) {
FileNum = Row.File;
MS->EmitIntValue(dwarf::DW_LNS_set_file, 1);
MS->EmitULEB128IntValue(FileNum);
LineSectionSize += 1 + getULEB128Size(FileNum);
}
if (Column != Row.Column) {
Column = Row.Column;
MS->EmitIntValue(dwarf::DW_LNS_set_column, 1);
MS->EmitULEB128IntValue(Column);
LineSectionSize += 1 + getULEB128Size(Column);
}
if (Isa != Row.Isa) {
Isa = Row.Isa;
MS->EmitIntValue(dwarf::DW_LNS_set_isa, 1);
MS->EmitULEB128IntValue(Isa);
LineSectionSize += 1 + getULEB128Size(Isa);
}
if (IsStatement != Row.IsStmt) {
IsStatement = Row.IsStmt;
MS->EmitIntValue(dwarf::DW_LNS_negate_stmt, 1);
LineSectionSize += 1;
}
if (Row.BasicBlock) {
MS->EmitIntValue(dwarf::DW_LNS_set_basic_block, 1);
LineSectionSize += 1;
}
if (Row.PrologueEnd) {
MS->EmitIntValue(dwarf::DW_LNS_set_prologue_end, 1);
LineSectionSize += 1;
}
if (Row.EpilogueBegin) {
MS->EmitIntValue(dwarf::DW_LNS_set_epilogue_begin, 1);
LineSectionSize += 1;
}
int64_t LineDelta = int64_t(Row.Line) - LastLine;
if (!Row.EndSequence) {
MCDwarfLineAddr::Encode(*MC, Params, LineDelta, AddressDelta, EncodingOS);
MS->EmitBytes(EncodingOS.str());
LineSectionSize += EncodingBuffer.size();
EncodingBuffer.resize(0);
Address = Row.Address;
LastLine = Row.Line;
RowsSinceLastSequence++;
} else {
if (LineDelta) {
MS->EmitIntValue(dwarf::DW_LNS_advance_line, 1);
MS->EmitSLEB128IntValue(LineDelta);
LineSectionSize += 1 + getSLEB128Size(LineDelta);
}
if (AddressDelta) {
MS->EmitIntValue(dwarf::DW_LNS_advance_pc, 1);
MS->EmitULEB128IntValue(AddressDelta);
LineSectionSize += 1 + getULEB128Size(AddressDelta);
}
MCDwarfLineAddr::Encode(*MC, Params, INT64_MAX, 0, EncodingOS);
MS->EmitBytes(EncodingOS.str());
LineSectionSize += EncodingBuffer.size();
EncodingBuffer.resize(0);
Address = -1ULL;
LastLine = FileNum = IsStatement = 1;
RowsSinceLastSequence = Column = Isa = 0;
}
}
if (RowsSinceLastSequence) {
MCDwarfLineAddr::Encode(*MC, Params, INT64_MAX, 0, EncodingOS);
MS->EmitBytes(EncodingOS.str());
LineSectionSize += EncodingBuffer.size();
EncodingBuffer.resize(0);
}
MS->EmitLabel(LineEndSym);
}
static void emitSectionContents(const object::ObjectFile &Obj,
StringRef SecName, MCStreamer *MS) {
StringRef Contents;
if (auto Sec = getSectionByName(Obj, SecName))
if (!Sec->getContents(Contents))
MS->EmitBytes(Contents);
}
void DwarfStreamer::translateLineTable(DataExtractor Data, uint32_t Offset,
LinkOptions &Options) {
MS->SwitchSection(MC->getObjectFileInfo()->getDwarfLineSection());
StringRef Contents = Data.getData();
unsigned UnitLength = Data.getU32(&Offset);
unsigned UnitEnd = Offset + UnitLength;
MCSymbol *BeginLabel = MC->createTempSymbol();
MCSymbol *EndLabel = MC->createTempSymbol();
unsigned Version = Data.getU16(&Offset);
if (Version > 5) {
warn("Unsupported line table version. Dropping contents.",
"Unobfsucating line table");
return;
}
Asm->EmitLabelDifference(EndLabel, BeginLabel, 4);
Asm->OutStreamer->EmitLabel(BeginLabel);
Asm->EmitInt16(Version);
LineSectionSize += 6;
MCSymbol *HeaderBeginLabel = MC->createTempSymbol();
MCSymbol *HeaderEndLabel = MC->createTempSymbol();
Asm->EmitLabelDifference(HeaderEndLabel, HeaderBeginLabel, 4);
Asm->OutStreamer->EmitLabel(HeaderBeginLabel);
Offset += 4;
LineSectionSize += 4;
uint32_t AfterHeaderLengthOffset = Offset;
Offset += (Version >= 4) ? 5 : 4;
unsigned OpcodeBase = Data.getU8(&Offset);
Offset += OpcodeBase - 1;
Asm->OutStreamer->EmitBytes(Contents.slice(AfterHeaderLengthOffset, Offset));
LineSectionSize += Offset - AfterHeaderLengthOffset;
while (const char *Dir = Data.getCStr(&Offset)) {
if (Dir[0] == 0)
break;
StringRef Translated = Options.Translator(Dir);
Asm->OutStreamer->EmitBytes(Translated);
Asm->EmitInt8(0);
LineSectionSize += Translated.size() + 1;
}
Asm->EmitInt8(0);
LineSectionSize += 1;
while (const char *File = Data.getCStr(&Offset)) {
if (File[0] == 0)
break;
StringRef Translated = Options.Translator(File);
Asm->OutStreamer->EmitBytes(Translated);
Asm->EmitInt8(0);
LineSectionSize += Translated.size() + 1;
uint32_t OffsetBeforeLEBs = Offset;
Asm->EmitULEB128(Data.getULEB128(&Offset));
Asm->EmitULEB128(Data.getULEB128(&Offset));
Asm->EmitULEB128(Data.getULEB128(&Offset));
LineSectionSize += Offset - OffsetBeforeLEBs;
}
Asm->EmitInt8(0);
LineSectionSize += 1;
Asm->OutStreamer->EmitLabel(HeaderEndLabel);
Asm->OutStreamer->EmitBytes(Contents.slice(Offset, UnitEnd));
LineSectionSize += UnitEnd - Offset;
Asm->OutStreamer->EmitLabel(EndLabel);
Offset = UnitEnd;
}
void DwarfStreamer::copyInvariantDebugSection(const object::ObjectFile &Obj,
LinkOptions &Options) {
if (!Options.Translator) {
MS->SwitchSection(MC->getObjectFileInfo()->getDwarfLineSection());
emitSectionContents(Obj, "debug_line", MS);
}
MS->SwitchSection(MC->getObjectFileInfo()->getDwarfLocSection());
emitSectionContents(Obj, "debug_loc", MS);
MS->SwitchSection(MC->getObjectFileInfo()->getDwarfRangesSection());
emitSectionContents(Obj, "debug_ranges", MS);
MS->SwitchSection(MC->getObjectFileInfo()->getDwarfFrameSection());
emitSectionContents(Obj, "debug_frame", MS);
MS->SwitchSection(MC->getObjectFileInfo()->getDwarfARangesSection());
emitSectionContents(Obj, "debug_aranges", MS);
}
void DwarfStreamer::emitPubSectionForUnit(
MCSection *Sec, StringRef SecName, const CompileUnit &Unit,
const std::vector<CompileUnit::AccelInfo> &Names) {
if (Names.empty())
return;
Asm->OutStreamer->SwitchSection(Sec);
MCSymbol *BeginLabel = Asm->createTempSymbol("pub" + SecName + "_begin");
MCSymbol *EndLabel = Asm->createTempSymbol("pub" + SecName + "_end");
bool HeaderEmitted = false;
for (const auto &Name : Names) {
if (Name.SkipPubSection)
continue;
if (!HeaderEmitted) {
Asm->EmitLabelDifference(EndLabel, BeginLabel, 4); Asm->OutStreamer->EmitLabel(BeginLabel);
Asm->EmitInt16(dwarf::DW_PUBNAMES_VERSION); Asm->EmitInt32(Unit.getStartOffset()); Asm->EmitInt32(Unit.getNextUnitOffset() - Unit.getStartOffset()); HeaderEmitted = true;
}
Asm->EmitInt32(Name.Die->getOffset());
Asm->OutStreamer->EmitBytes(StringRef(Name.Name.getString().data(),
Name.Name.getString().size() + 1));
}
if (!HeaderEmitted)
return;
Asm->EmitInt32(0); Asm->OutStreamer->EmitLabel(EndLabel);
}
void DwarfStreamer::emitPubNamesForUnit(const CompileUnit &Unit) {
emitPubSectionForUnit(MC->getObjectFileInfo()->getDwarfPubNamesSection(),
"names", Unit, Unit.getPubnames());
}
void DwarfStreamer::emitPubTypesForUnit(const CompileUnit &Unit) {
emitPubSectionForUnit(MC->getObjectFileInfo()->getDwarfPubTypesSection(),
"types", Unit, Unit.getPubtypes());
}
void DwarfStreamer::emitCIE(StringRef CIEBytes) {
MS->SwitchSection(MC->getObjectFileInfo()->getDwarfFrameSection());
MS->EmitBytes(CIEBytes);
FrameSectionSize += CIEBytes.size();
}
void DwarfStreamer::emitFDE(uint32_t CIEOffset, uint32_t AddrSize,
uint32_t Address, StringRef FDEBytes) {
MS->SwitchSection(MC->getObjectFileInfo()->getDwarfFrameSection());
MS->EmitIntValue(FDEBytes.size() + 4 + AddrSize, 4);
MS->EmitIntValue(CIEOffset, 4);
MS->EmitIntValue(Address, AddrSize);
MS->EmitBytes(FDEBytes);
FrameSectionSize += FDEBytes.size() + 8 + AddrSize;
}
void DwarfStreamer::emitSwiftModule(StringRef Buffer) {
auto Section =
MC->getMachOSection("__DWARF", "__swift_ast", MachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
Section->setAlignment(1 << 5);
MS->SwitchSection(Section);
MS->EmitBytes(Buffer);
}
class DwarfLinker {
public:
DwarfLinker(StringRef OutputFilename, const LinkOptions &Options)
: OutputFilename(OutputFilename), Options(Options),
BinHolder(Options.Verbose), StringPool(Options.Translator),
LastCIEOffset(0) {}
bool link(const DebugMap &);
void reportWarning(const Twine &Warning, const DWARFUnit *Unit = nullptr,
const DWARFDebugInfoEntryMinimal *DIE = nullptr) const;
private:
void startDebugObject(DWARFContext &, DebugMapObject &);
void endDebugObject();
bool emitBNIWarnings(const DebugMapObject &DMO, const DebugMap &Map);
class RelocationManager {
struct ValidReloc {
uint32_t Offset;
uint32_t Size;
uint64_t Addend;
const DebugMapObject::DebugMapEntry *Mapping;
ValidReloc(uint32_t Offset, uint32_t Size, uint64_t Addend,
const DebugMapObject::DebugMapEntry *Mapping)
: Offset(Offset), Size(Size), Addend(Addend), Mapping(Mapping) {}
bool operator<(const ValidReloc &RHS) const {
return Offset < RHS.Offset;
}
};
DwarfLinker &Linker;
std::vector<ValidReloc> ValidRelocs;
unsigned NextValidReloc;
public:
RelocationManager(DwarfLinker &Linker)
: Linker(Linker), NextValidReloc(0) {}
bool hasValidRelocs() const { return !ValidRelocs.empty(); }
void resetValidRelocs() { NextValidReloc = 0; }
bool findValidRelocsInDebugInfo(const object::ObjectFile &Obj,
const DebugMapObject &DMO);
bool findValidRelocs(const object::SectionRef &Section,
const object::ObjectFile &Obj,
const DebugMapObject &DMO);
void findValidRelocsMachO(const object::SectionRef &Section,
const object::MachOObjectFile &Obj,
const DebugMapObject &DMO);
bool hasValidRelocation(uint32_t StartOffset, uint32_t EndOffset,
CompileUnit::DIEInfo &Info);
bool applyValidRelocs(MutableArrayRef<char> Data, uint32_t BaseOffset,
bool isLittleEndian);
};
void lookForDIEsToKeep(RelocationManager &RelocMgr,
const DWARFDebugInfoEntryMinimal &DIE,
const DebugMapObject &DMO, CompileUnit &CU,
unsigned Flags);
bool registerModuleReference(const DWARFDebugInfoEntryMinimal &CUDie,
const DWARFUnit &Unit, DebugMap &ModuleMap,
unsigned Indent = 0);
void loadClangModule(StringRef Filename, StringRef ModulePath,
StringRef ModuleName, uint64_t DwoId,
DebugMap &ModuleMap, unsigned Indent = 0);
enum TravesalFlags {
TF_Keep = 1 << 0, TF_InFunctionScope = 1 << 1, TF_DependencyWalk = 1 << 2, TF_ParentWalk = 1 << 3, TF_ODR = 1 << 4, TF_SkipPC = 1 << 5, };
void keepDIEAndDependencies(RelocationManager &RelocMgr,
const DWARFDebugInfoEntryMinimal &DIE,
CompileUnit::DIEInfo &MyInfo,
const DebugMapObject &DMO, CompileUnit &CU,
bool UseODR);
unsigned shouldKeepDIE(RelocationManager &RelocMgr,
const DWARFDebugInfoEntryMinimal &DIE,
CompileUnit &Unit, CompileUnit::DIEInfo &MyInfo,
unsigned Flags);
unsigned shouldKeepVariableDIE(RelocationManager &RelocMgr,
const DWARFDebugInfoEntryMinimal &DIE,
CompileUnit &Unit,
CompileUnit::DIEInfo &MyInfo, unsigned Flags);
unsigned shouldKeepSubprogramDIE(RelocationManager &RelocMgr,
const DWARFDebugInfoEntryMinimal &DIE,
CompileUnit &Unit,
CompileUnit::DIEInfo &MyInfo,
unsigned Flags);
bool hasValidRelocation(uint32_t StartOffset, uint32_t EndOffset,
CompileUnit::DIEInfo &Info);
class DIECloner {
DwarfLinker &Linker;
RelocationManager &RelocMgr;
BumpPtrAllocator &DIEAlloc;
MutableArrayRef<CompileUnit> CompileUnits;
LinkOptions Options;
public:
DIECloner(DwarfLinker &Linker, RelocationManager &RelocMgr,
BumpPtrAllocator &DIEAlloc,
MutableArrayRef<CompileUnit> CompileUnits, LinkOptions &Options)
: Linker(Linker), RelocMgr(RelocMgr), DIEAlloc(DIEAlloc),
CompileUnits(CompileUnits), Options(Options) {}
DIE *cloneDIE(const DWARFDebugInfoEntryMinimal &InputDIE, CompileUnit &U,
int64_t PCOffset, uint32_t OutOffset, unsigned Flags);
void cloneAllCompileUnits(DWARFContextInMemory &DwarfContext);
private:
typedef DWARFAbbreviationDeclaration::AttributeSpec AttributeSpec;
struct AttributesInfo {
DwarfStringPoolEntryRef Name, MangledName, NameWithoutTemplate;
uint64_t OrigLowPc; uint64_t OrigHighPc; int64_t PCOffset;
bool HasLowPc; bool HasRanges; bool IsDeclaration;
AttributesInfo()
: OrigLowPc(UINT64_MAX), OrigHighPc(0), PCOffset(0), HasLowPc(false),
HasRanges(false), IsDeclaration(false) {}
};
unsigned cloneAttribute(DIE &Die,
const DWARFDebugInfoEntryMinimal &InputDIE,
CompileUnit &U, const DWARFFormValue &Val,
const AttributeSpec AttrSpec, unsigned AttrSize,
AttributesInfo &AttrInfo);
unsigned cloneStringAttribute(DIE &Die, AttributeSpec AttrSpec,
const DWARFFormValue &Val,
const DWARFUnit &U,
AttributesInfo &Info);
unsigned
cloneDieReferenceAttribute(DIE &Die,
const DWARFDebugInfoEntryMinimal &InputDIE,
AttributeSpec AttrSpec, unsigned AttrSize,
const DWARFFormValue &Val, CompileUnit &Unit);
unsigned cloneBlockAttribute(DIE &Die, AttributeSpec AttrSpec,
const DWARFFormValue &Val, unsigned AttrSize);
unsigned cloneAddressAttribute(DIE &Die, AttributeSpec AttrSpec,
const DWARFFormValue &Val,
const CompileUnit &Unit,
AttributesInfo &Info);
unsigned cloneScalarAttribute(DIE &Die,
const DWARFDebugInfoEntryMinimal &InputDIE,
CompileUnit &U, AttributeSpec AttrSpec,
const DWARFFormValue &Val, unsigned AttrSize,
AttributesInfo &Info);
bool getDIENames(const DWARFDebugInfoEntryMinimal &Die, DWARFUnit &U,
AttributesInfo &Info, bool StripTemplate = false);
void copyAbbrev(const DWARFAbbreviationDeclaration &Abbrev, bool hasODR);
uint32_t hashFullyQualifiedName(const DWARFDebugInfoEntryMinimal *DIE,
CompileUnit &U, int RecurseDepth = 0);
void addObjCAccelerator(CompileUnit &Unit, const DIE *Die,
DwarfStringPoolEntryRef Name, bool SkipPubSection);
};
void AssignAbbrev(DIEAbbrev &Abbrev);
FoldingSet<DIEAbbrev> AbbreviationsSet;
std::vector<std::unique_ptr<DIEAbbrev>> Abbreviations;
void patchRangesForUnit(const CompileUnit &Unit, DWARFContext &Dwarf) const;
void generateUnitRanges(CompileUnit &Unit) const;
void patchLineTableForUnit(CompileUnit &Unit, DWARFContext &OrigDwarf);
void emitAcceleratorEntriesForUnit(CompileUnit &Unit);
void patchFrameInfoForObject(const DebugMapObject &, DWARFContext &,
unsigned AddressSize);
std::vector<DIELoc *> DIELocs;
std::vector<DIEBlock *> DIEBlocks;
BumpPtrAllocator DIEAlloc;
DeclContextTree ODRContexts;
bool createStreamer(Triple TheTriple, StringRef OutputFilename);
ErrorOr<const object::ObjectFile &> loadObject(BinaryHolder &BinaryHolder,
DebugMapObject &Obj,
const DebugMap &Map);
std::string OutputFilename;
LinkOptions Options;
BinaryHolder BinHolder;
std::unique_ptr<DwarfStreamer> Streamer;
uint64_t OutputDebugInfoSize;
unsigned UnitID;
std::vector<CompileUnit> Units;
DebugMapObject *CurrentDebugObject;
NonRelocatableStringpool StringPool;
std::map<uint64_t, std::pair<uint64_t, int64_t>> Ranges;
StringMap<uint32_t> EmittedCIEs;
uint32_t LastCIEOffset;
StaticDIEDwarfAccelTable AppleNames;
StaticDIEDwarfAccelTable AppleNamespaces;
StaticTypeDwarfAccelTable AppleTypes;
StaticDIEDwarfAccelTable AppleObjc;
StringMap<uint64_t> ClangModules;
bool ModuleCacheHintDisplayed = false;
bool ArchiveHintDisplayed = false;
};
static CompileUnit *getUnitForOffset(MutableArrayRef<CompileUnit> Units,
unsigned Offset) {
auto CU =
std::upper_bound(Units.begin(), Units.end(), Offset,
[](uint32_t LHS, const CompileUnit &RHS) {
return LHS < RHS.getOrigUnit().getNextUnitOffset();
});
return CU != Units.end() ? &*CU : nullptr;
}
static const DWARFDebugInfoEntryMinimal *resolveDIEReference(
const DwarfLinker &Linker, MutableArrayRef<CompileUnit> Units,
const DWARFFormValue &RefValue, const DWARFUnit &Unit,
const DWARFDebugInfoEntryMinimal &DIE, CompileUnit *&RefCU) {
assert(RefValue.isFormClass(DWARFFormValue::FC_Reference));
if (RefValue.getForm() == dwarf::DW_FORM_ref_sig8)
return nullptr;
uint64_t RefOffset = *RefValue.getAsReference(&Unit);
if ((RefCU = getUnitForOffset(Units, RefOffset)))
if (const auto *RefDie = RefCU->getOrigUnit().getDIEForOffset(RefOffset))
return RefDie;
Linker.reportWarning("could not find referenced DIE", &Unit, &DIE);
return nullptr;
}
static bool isODRAttribute(uint16_t Attr) {
switch (Attr) {
default:
return false;
case dwarf::DW_AT_type:
case dwarf::DW_AT_containing_type:
case dwarf::DW_AT_specification:
case dwarf::DW_AT_abstract_origin:
case dwarf::DW_AT_import:
return true;
}
llvm_unreachable("Improper attribute.");
}
bool DeclContext::setLastSeenDIE(CompileUnit &U,
const DWARFDebugInfoEntryMinimal *Die) {
if (LastSeenCompileUnitID == U.getUniqueID()) {
DWARFUnit &OrigUnit = U.getOrigUnit();
uint32_t FirstIdx = OrigUnit.getDIEIndex(LastSeenDIE);
U.getInfo(FirstIdx).Ctxt = nullptr;
return false;
}
LastSeenCompileUnitID = U.getUniqueID();
LastSeenDIE = Die;
return true;
}
PointerIntPair<DeclContext *, 1> DeclContextTree::getChildDeclContext(
DeclContext &Context, const DWARFDebugInfoEntryMinimal *DIE, CompileUnit &U,
NonRelocatableStringpool &StringPool, bool InClangModule) {
unsigned Tag = DIE->getTag();
switch (Tag) {
default:
return PointerIntPair<DeclContext *, 1>(nullptr);
case dwarf::DW_TAG_module:
break;
case dwarf::DW_TAG_compile_unit:
return PointerIntPair<DeclContext *, 1>(&Context);
case dwarf::DW_TAG_subprogram:
if ((Context.getTag() == dwarf::DW_TAG_namespace ||
Context.getTag() == dwarf::DW_TAG_compile_unit) &&
!DIE->getAttributeValueAsUnsignedConstant(&U.getOrigUnit(),
dwarf::DW_AT_external, 0))
return PointerIntPair<DeclContext *, 1>(nullptr);
case dwarf::DW_TAG_member:
case dwarf::DW_TAG_namespace:
case dwarf::DW_TAG_structure_type:
case dwarf::DW_TAG_class_type:
case dwarf::DW_TAG_union_type:
case dwarf::DW_TAG_enumeration_type:
case dwarf::DW_TAG_typedef:
if (DIE->getAttributeValueAsUnsignedConstant(&U.getOrigUnit(),
dwarf::DW_AT_artificial, 0))
return PointerIntPair<DeclContext *, 1>(nullptr);
break;
}
const char *Name = DIE->getName(&U.getOrigUnit(), DINameKind::LinkageName);
const char *ShortName = DIE->getName(&U.getOrigUnit(), DINameKind::ShortName);
StringRef NameRef;
StringRef ShortNameRef;
StringRef FileRef;
if (Name)
NameRef = StringPool.internString(Name);
else if (Tag == dwarf::DW_TAG_namespace)
NameRef = StringPool.internString("(anonymous namespace)");
if (ShortName && ShortName != Name)
ShortNameRef = StringPool.internString(ShortName);
else
ShortNameRef = NameRef;
if (Tag != dwarf::DW_TAG_class_type && Tag != dwarf::DW_TAG_structure_type &&
Tag != dwarf::DW_TAG_union_type &&
Tag != dwarf::DW_TAG_enumeration_type && NameRef.empty())
return PointerIntPair<DeclContext *, 1>(nullptr);
std::string File;
unsigned Line = 0;
unsigned ByteSize = UINT32_MAX;
if (!InClangModule) {
ByteSize = DIE->getAttributeValueAsUnsignedConstant(
&U.getOrigUnit(), dwarf::DW_AT_byte_size, UINT64_MAX);
if (Tag != dwarf::DW_TAG_namespace || !Name) {
if (unsigned FileNum = DIE->getAttributeValueAsUnsignedConstant(
&U.getOrigUnit(), dwarf::DW_AT_decl_file, 0)) {
if (const auto *LT = U.getOrigUnit().getContext().getLineTableForUnit(
&U.getOrigUnit())) {
if (!Name && Tag == dwarf::DW_TAG_namespace)
FileNum = 1;
if (LT->getFileNameByIndex(
FileNum, "",
DILineInfoSpecifier::FileLineInfoKind::AbsoluteFilePath,
File)) {
Line = DIE->getAttributeValueAsUnsignedConstant(
&U.getOrigUnit(), dwarf::DW_AT_decl_line, 0);
#ifdef HAVE_REALPATH
if (const char *ResolvedPath = U.getResolvedPath(FileNum)) {
File = ResolvedPath;
} else {
char RealPath[PATH_MAX + 1];
RealPath[PATH_MAX] = 0;
if (::realpath(File.c_str(), RealPath))
File = RealPath;
U.setResolvedPath(FileNum, File);
}
#endif
FileRef = StringPool.internString(File);
}
}
}
}
}
if (!Line && NameRef.empty())
return PointerIntPair<DeclContext *, 1>(nullptr);
unsigned Hash = hash_combine(Context.getQualifiedNameHash(), Tag, NameRef);
if (Tag == dwarf::DW_TAG_namespace && NameRef == "(anonymous namespace)")
Hash = hash_combine(Hash, FileRef);
DeclContext Key(Hash, Line, ByteSize, Tag, NameRef, FileRef, Context);
auto ContextIter = Contexts.find(&Key);
if (ContextIter == Contexts.end()) {
bool Inserted;
DeclContext *NewContext =
new (Allocator) DeclContext(Hash, Line, ByteSize, Tag, NameRef, FileRef,
Context, DIE, U.getUniqueID());
std::tie(ContextIter, Inserted) = Contexts.insert(NewContext);
assert(Inserted && "Failed to insert DeclContext");
(void)Inserted;
} else if (Tag != dwarf::DW_TAG_namespace &&
!(*ContextIter)->setLastSeenDIE(U, DIE)) {
return PointerIntPair<DeclContext *, 1>(*ContextIter, 1);
}
assert(ContextIter != Contexts.end());
if ((Tag == dwarf::DW_TAG_subprogram &&
Context.getTag() != dwarf::DW_TAG_structure_type &&
Context.getTag() != dwarf::DW_TAG_class_type) ||
(Tag == dwarf::DW_TAG_union_type))
return PointerIntPair<DeclContext *, 1>(*ContextIter, 1);
return PointerIntPair<DeclContext *, 1>(*ContextIter);
}
bool DwarfLinker::DIECloner::getDIENames(const DWARFDebugInfoEntryMinimal &Die,
DWARFUnit &U, AttributesInfo &Info,
bool StripTemplate) {
if (Die.getTag() == dwarf::DW_TAG_lexical_block)
return false;
if (!Info.MangledName)
if (const char *MangledName = Die.getName(&U, DINameKind::LinkageName))
Info.MangledName = Linker.StringPool.getEntry(MangledName);
if (!Info.Name)
if (const char *Name = Die.getName(&U, DINameKind::ShortName))
Info.Name = Linker.StringPool.getEntry(Name);
if (StripTemplate && Info.Name && Info.MangledName != Info.Name) {
auto Split = Info.Name.getString().split('<');
if (!Split.second.empty())
Info.NameWithoutTemplate = Linker.StringPool.getEntry(Split.first);
}
return Info.Name || Info.MangledName;
}
void DwarfLinker::reportWarning(const Twine &Warning, const DWARFUnit *Unit,
const DWARFDebugInfoEntryMinimal *DIE) const {
StringRef Context = "<debug map>";
if (CurrentDebugObject)
Context = CurrentDebugObject->getObjectFilename();
warn(Warning, Context);
if (!Options.Verbose || !DIE)
return;
errs() << " in DIE:\n";
DIE->dump(errs(), const_cast<DWARFUnit *>(Unit), 0 ,
6 );
}
bool DwarfLinker::createStreamer(Triple TheTriple, StringRef OutputFilename) {
if (Options.NoOutput)
return true;
Streamer = llvm::make_unique<DwarfStreamer>();
return Streamer->init(TheTriple, OutputFilename);
}
static bool analyzeContextInfo(const DWARFDebugInfoEntryMinimal *DIE,
unsigned ParentIdx, CompileUnit &CU,
DeclContext *CurrentDeclContext,
NonRelocatableStringpool &StringPool,
DeclContextTree &Contexts,
bool InImportedModule = false) {
unsigned MyIdx = CU.getOrigUnit().getDIEIndex(DIE);
CompileUnit::DIEInfo &Info = CU.getInfo(MyIdx);
if (DIE->getTag() == dwarf::DW_TAG_module && ParentIdx == 0 &&
DIE->getAttributeValueAsString(&CU.getOrigUnit(), dwarf::DW_AT_name,
"") != CU.getClangModuleName()) {
InImportedModule = true;
}
Info.ParentIdx = ParentIdx;
bool InClangModule = CU.isClangModule() || InImportedModule;
if (CU.hasODR() || InClangModule) {
if (CurrentDeclContext) {
auto PtrInvalidPair = Contexts.getChildDeclContext(
*CurrentDeclContext, DIE, CU, StringPool, InClangModule);
CurrentDeclContext = PtrInvalidPair.getPointer();
Info.Ctxt =
PtrInvalidPair.getInt() ? nullptr : PtrInvalidPair.getPointer();
} else
Info.Ctxt = CurrentDeclContext = nullptr;
}
Info.Prune = InImportedModule;
if (DIE->hasChildren())
for (auto *Child = DIE->getFirstChild(); Child && !Child->isNULL();
Child = Child->getSibling())
Info.Prune &= analyzeContextInfo(Child, MyIdx, CU, CurrentDeclContext,
StringPool, Contexts, InImportedModule);
Info.Prune &= (DIE->getTag() == dwarf::DW_TAG_module) ||
DIE->getAttributeValueAsUnsignedConstant(
&CU.getOrigUnit(), dwarf::DW_AT_declaration, 0);
Info.Prune &= Info.Ctxt && Info.Ctxt->getCanonicalDIEOffset();
return Info.Prune;
}
static bool dieNeedsChildrenToBeMeaningful(uint32_t Tag) {
switch (Tag) {
default:
return false;
case dwarf::DW_TAG_subprogram:
case dwarf::DW_TAG_lexical_block:
case dwarf::DW_TAG_subroutine_type:
case dwarf::DW_TAG_structure_type:
case dwarf::DW_TAG_class_type:
case dwarf::DW_TAG_union_type:
return true;
}
llvm_unreachable("Invalid Tag");
}
static unsigned getRefAddrSize(const DWARFUnit &U) {
if (U.getVersion() == 2)
return U.getAddressByteSize();
return 4;
}
void DwarfLinker::startDebugObject(DWARFContext &Dwarf, DebugMapObject &Obj) {
Units.reserve(Dwarf.getNumCompileUnits());
for (const auto &Entry : Obj.symbols()) {
const auto &Mapping = Entry.getValue();
if (Mapping.Size && Mapping.ObjectAddress)
Ranges[*Mapping.ObjectAddress] = std::make_pair(
*Mapping.ObjectAddress + Mapping.Size,
int64_t(Mapping.BinaryAddress) - *Mapping.ObjectAddress);
}
}
void DwarfLinker::endDebugObject() {
Units.clear();
Ranges.clear();
for (auto I = DIEBlocks.begin(), E = DIEBlocks.end(); I != E; ++I)
(*I)->~DIEBlock();
for (auto I = DIELocs.begin(), E = DIELocs.end(); I != E; ++I)
(*I)->~DIELoc();
DIEBlocks.clear();
DIELocs.clear();
DIEAlloc.Reset();
}
static bool isMachOPairedReloc(uint64_t RelocType, uint64_t Arch) {
switch (Arch) {
case Triple::x86:
return RelocType == MachO::GENERIC_RELOC_SECTDIFF ||
RelocType == MachO::GENERIC_RELOC_LOCAL_SECTDIFF;
case Triple::x86_64:
return RelocType == MachO::X86_64_RELOC_SUBTRACTOR;
case Triple::arm:
case Triple::thumb:
return RelocType == MachO::ARM_RELOC_SECTDIFF ||
RelocType == MachO::ARM_RELOC_LOCAL_SECTDIFF ||
RelocType == MachO::ARM_RELOC_HALF ||
RelocType == MachO::ARM_RELOC_HALF_SECTDIFF;
case Triple::aarch64:
return RelocType == MachO::ARM64_RELOC_SUBTRACTOR;
default:
return false;
}
}
void DwarfLinker::RelocationManager::
findValidRelocsMachO(const object::SectionRef &Section,
const object::MachOObjectFile &Obj,
const DebugMapObject &DMO) {
StringRef Contents;
Section.getContents(Contents);
DataExtractor Data(Contents, Obj.isLittleEndian(), 0);
bool SkipNext = false;
for (const object::RelocationRef &Reloc : Section.relocations()) {
if (SkipNext) {
SkipNext = false;
continue;
}
object::DataRefImpl RelocDataRef = Reloc.getRawDataRefImpl();
MachO::any_relocation_info MachOReloc = Obj.getRelocation(RelocDataRef);
if (isMachOPairedReloc(Obj.getAnyRelocationType(MachOReloc),
Obj.getArch())) {
SkipNext = true;
Linker.reportWarning(" unsupported relocation in debug_info section.");
continue;
}
unsigned RelocSize = 1 << Obj.getAnyRelocationLength(MachOReloc);
uint64_t Offset64 = Reloc.getOffset();
if ((RelocSize != 4 && RelocSize != 8)) {
Linker.reportWarning(" unsupported relocation in debug_info section.");
continue;
}
uint32_t Offset = Offset64;
uint64_t Addend = Data.getUnsigned(&Offset, RelocSize);
uint64_t SymAddress;
int64_t SymOffset;
if (Obj.isRelocationScattered(MachOReloc)) {
SymAddress = Obj.getScatteredRelocationValue(MachOReloc);
SymOffset = int64_t(Addend) - SymAddress;
} else {
SymAddress = Addend;
SymOffset = 0;
}
auto Sym = Reloc.getSymbol();
if (Sym != Obj.symbol_end()) {
ErrorOr<StringRef> SymbolName = Sym->getName();
if (!SymbolName) {
Linker.reportWarning("error getting relocation symbol name.");
continue;
}
if (const auto *Mapping = DMO.lookupSymbol(*SymbolName))
ValidRelocs.emplace_back(Offset64, RelocSize, Addend, Mapping);
} else if (const auto *Mapping = DMO.lookupObjectAddress(SymAddress)) {
ValidRelocs.emplace_back(Offset64, RelocSize, SymOffset, Mapping);
}
}
}
bool DwarfLinker::RelocationManager::findValidRelocs(
const object::SectionRef &Section, const object::ObjectFile &Obj,
const DebugMapObject &DMO) {
if (auto *MachOObj = dyn_cast<object::MachOObjectFile>(&Obj))
findValidRelocsMachO(Section, *MachOObj, DMO);
else
Linker.reportWarning(Twine("unsupported object file type: ") +
Obj.getFileName());
if (ValidRelocs.empty())
return false;
std::sort(ValidRelocs.begin(), ValidRelocs.end());
return true;
}
bool DwarfLinker::RelocationManager::
findValidRelocsInDebugInfo(const object::ObjectFile &Obj,
const DebugMapObject &DMO) {
for (const object::SectionRef &Section : Obj.sections()) {
StringRef SectionName;
Section.getName(SectionName);
SectionName = SectionName.substr(SectionName.find_first_not_of("._"));
if (SectionName != "debug_info")
continue;
return findValidRelocs(Section, Obj, DMO);
}
return false;
}
bool DwarfLinker::RelocationManager::
hasValidRelocation(uint32_t StartOffset, uint32_t EndOffset,
CompileUnit::DIEInfo &Info) {
assert(NextValidReloc == 0 ||
StartOffset > ValidRelocs[NextValidReloc - 1].Offset);
if (NextValidReloc >= ValidRelocs.size())
return false;
uint64_t RelocOffset = ValidRelocs[NextValidReloc].Offset;
while (RelocOffset < StartOffset && NextValidReloc < ValidRelocs.size() - 1)
RelocOffset = ValidRelocs[++NextValidReloc].Offset;
if (RelocOffset < StartOffset || RelocOffset >= EndOffset)
return false;
const auto &ValidReloc = ValidRelocs[NextValidReloc++];
const auto &Mapping = ValidReloc.Mapping->getValue();
uint64_t ObjectAddress =
Mapping.ObjectAddress ? uint64_t(*Mapping.ObjectAddress) : UINT64_MAX;
if (Linker.Options.Verbose)
outs() << "Found valid debug map entry: " << ValidReloc.Mapping->getKey()
<< " " << format("\t%016" PRIx64 " => %016" PRIx64, ObjectAddress,
uint64_t(Mapping.BinaryAddress));
Info.AddrAdjust = int64_t(Mapping.BinaryAddress) + ValidReloc.Addend;
if (Mapping.ObjectAddress)
Info.AddrAdjust -= ObjectAddress;
Info.InDebugMap = true;
return true;
}
static std::pair<uint32_t, uint32_t>
getAttributeOffsets(const DWARFAbbreviationDeclaration *Abbrev, unsigned Idx,
unsigned Offset, const DWARFUnit &Unit) {
DataExtractor Data = Unit.getDebugInfoExtractor();
for (unsigned i = 0; i < Idx; ++i)
DWARFFormValue::skipValue(Abbrev->getFormByIndex(i), Data, &Offset, &Unit);
uint32_t End = Offset;
DWARFFormValue::skipValue(Abbrev->getFormByIndex(Idx), Data, &End, &Unit);
return std::make_pair(Offset, End);
}
unsigned DwarfLinker::shouldKeepVariableDIE(RelocationManager &RelocMgr,
const DWARFDebugInfoEntryMinimal &DIE,
CompileUnit &Unit,
CompileUnit::DIEInfo &MyInfo,
unsigned Flags) {
const auto *Abbrev = DIE.getAbbreviationDeclarationPtr();
if (!(Flags & TF_InFunctionScope) &&
Abbrev->findAttributeIndex(dwarf::DW_AT_const_value) != -1U) {
MyInfo.InDebugMap = true;
return Flags | TF_Keep;
}
uint32_t LocationIdx = Abbrev->findAttributeIndex(dwarf::DW_AT_location);
if (LocationIdx == -1U)
return Flags;
uint32_t Offset = DIE.getOffset() + getULEB128Size(Abbrev->getCode());
const DWARFUnit &OrigUnit = Unit.getOrigUnit();
uint32_t LocationOffset, LocationEndOffset;
std::tie(LocationOffset, LocationEndOffset) =
getAttributeOffsets(Abbrev, LocationIdx, Offset, OrigUnit);
if (!RelocMgr.hasValidRelocation(LocationOffset, LocationEndOffset, MyInfo) ||
(Flags & TF_InFunctionScope))
return Flags;
if (Options.Verbose)
DIE.dump(outs(), const_cast<DWARFUnit *>(&OrigUnit), 0, 8 );
return Flags | TF_Keep;
}
unsigned DwarfLinker::shouldKeepSubprogramDIE(
RelocationManager &RelocMgr,
const DWARFDebugInfoEntryMinimal &DIE, CompileUnit &Unit,
CompileUnit::DIEInfo &MyInfo, unsigned Flags) {
const auto *Abbrev = DIE.getAbbreviationDeclarationPtr();
Flags |= TF_InFunctionScope;
uint32_t LowPcIdx = Abbrev->findAttributeIndex(dwarf::DW_AT_low_pc);
if (LowPcIdx == -1U)
return Flags;
uint32_t Offset = DIE.getOffset() + getULEB128Size(Abbrev->getCode());
DWARFUnit &OrigUnit = Unit.getOrigUnit();
uint32_t LowPcOffset, LowPcEndOffset;
std::tie(LowPcOffset, LowPcEndOffset) =
getAttributeOffsets(Abbrev, LowPcIdx, Offset, OrigUnit);
uint64_t LowPc =
DIE.getAttributeValueAsAddress(&OrigUnit, dwarf::DW_AT_low_pc, -1ULL);
assert(LowPc != -1ULL && "low_pc attribute is not an address.");
if (LowPc == -1ULL ||
!RelocMgr.hasValidRelocation(LowPcOffset, LowPcEndOffset, MyInfo))
return Flags;
if (Options.Verbose)
DIE.dump(outs(), const_cast<DWARFUnit *>(&OrigUnit), 0, 8 );
if (DIE.getTag() == dwarf::DW_TAG_label) {
if (Unit.hasLabelAt(LowPc))
return Flags;
if (OrigUnit.getUnitDIE()->getAttributeValueAsAddress(
&OrigUnit, dwarf::DW_AT_high_pc, UINT64_MAX) <= LowPc)
return Flags;
Unit.addLabelLowPc(LowPc, MyInfo.AddrAdjust);
return Flags | TF_Keep;
}
Flags |= TF_Keep;
DWARFFormValue HighPcValue;
if (!DIE.getAttributeValue(&OrigUnit, dwarf::DW_AT_high_pc, HighPcValue)) {
reportWarning("Function without high_pc. Range will be discarded.\n",
&OrigUnit, &DIE);
return Flags;
}
uint64_t HighPc;
if (HighPcValue.isFormClass(DWARFFormValue::FC_Address)) {
HighPc = *HighPcValue.getAsAddress(&OrigUnit);
} else {
assert(HighPcValue.isFormClass(DWARFFormValue::FC_Constant));
HighPc = LowPc + *HighPcValue.getAsUnsignedConstant();
}
Ranges[LowPc] = std::make_pair(HighPc, MyInfo.AddrAdjust);
Unit.addFunctionRange(LowPc, HighPc, MyInfo.AddrAdjust);
return Flags;
}
unsigned DwarfLinker::shouldKeepDIE(RelocationManager &RelocMgr,
const DWARFDebugInfoEntryMinimal &DIE,
CompileUnit &Unit,
CompileUnit::DIEInfo &MyInfo,
unsigned Flags) {
switch (DIE.getTag()) {
case dwarf::DW_TAG_constant:
case dwarf::DW_TAG_variable:
return shouldKeepVariableDIE(RelocMgr, DIE, Unit, MyInfo, Flags);
case dwarf::DW_TAG_subprogram:
case dwarf::DW_TAG_label:
return shouldKeepSubprogramDIE(RelocMgr, DIE, Unit, MyInfo, Flags);
case dwarf::DW_TAG_module:
case dwarf::DW_TAG_imported_module:
case dwarf::DW_TAG_imported_declaration:
case dwarf::DW_TAG_imported_unit:
return Flags | TF_Keep;
}
return Flags;
}
void DwarfLinker::keepDIEAndDependencies(RelocationManager &RelocMgr,
const DWARFDebugInfoEntryMinimal &Die,
CompileUnit::DIEInfo &MyInfo,
const DebugMapObject &DMO,
CompileUnit &CU, bool UseODR) {
const DWARFUnit &Unit = CU.getOrigUnit();
MyInfo.Keep = true;
unsigned AncestorIdx = MyInfo.ParentIdx;
while (!CU.getInfo(AncestorIdx).Keep) {
unsigned ODRFlag = UseODR ? TF_ODR : 0;
lookForDIEsToKeep(RelocMgr, *Unit.getDIEAtIndex(AncestorIdx), DMO, CU,
TF_ParentWalk | TF_Keep | TF_DependencyWalk | ODRFlag);
AncestorIdx = CU.getInfo(AncestorIdx).ParentIdx;
}
DataExtractor Data = Unit.getDebugInfoExtractor();
const auto *Abbrev = Die.getAbbreviationDeclarationPtr();
uint32_t Offset = Die.getOffset() + getULEB128Size(Abbrev->getCode());
for (const auto &AttrSpec : Abbrev->attributes()) {
DWARFFormValue Val(AttrSpec.Form);
if (!Val.isFormClass(DWARFFormValue::FC_Reference)) {
DWARFFormValue::skipValue(AttrSpec.Form, Data, &Offset, &Unit);
continue;
}
Val.extractValue(Data, &Offset, &Unit);
CompileUnit *ReferencedCU;
if (const auto *RefDIE =
resolveDIEReference(*this, MutableArrayRef<CompileUnit>(Units), Val,
Unit, Die, ReferencedCU)) {
uint32_t RefIdx = ReferencedCU->getOrigUnit().getDIEIndex(RefDIE);
CompileUnit::DIEInfo &Info = ReferencedCU->getInfo(RefIdx);
if (AttrSpec.Form != dwarf::DW_FORM_ref_addr && UseODR && Info.Ctxt &&
Info.Ctxt != ReferencedCU->getInfo(Info.ParentIdx).Ctxt &&
Info.Ctxt->getCanonicalDIEOffset() && isODRAttribute(AttrSpec.Attr))
continue;
if (!(isODRAttribute(AttrSpec.Attr) && Info.Ctxt &&
Info.Ctxt->getCanonicalDIEOffset()))
Info.Prune = false;
unsigned ODRFlag = UseODR ? TF_ODR : 0;
lookForDIEsToKeep(RelocMgr, *RefDIE, DMO, *ReferencedCU,
TF_Keep | TF_DependencyWalk | ODRFlag);
}
}
}
void DwarfLinker::lookForDIEsToKeep(RelocationManager &RelocMgr,
const DWARFDebugInfoEntryMinimal &Die,
const DebugMapObject &DMO, CompileUnit &CU,
unsigned Flags) {
unsigned Idx = CU.getOrigUnit().getDIEIndex(&Die);
CompileUnit::DIEInfo &MyInfo = CU.getInfo(Idx);
bool AlreadyKept = MyInfo.Keep;
if (MyInfo.Prune)
return;
if ((Flags & TF_DependencyWalk) && AlreadyKept)
return;
if (!(Flags & TF_DependencyWalk))
Flags = shouldKeepDIE(RelocMgr, Die, CU, MyInfo, Flags);
if (!AlreadyKept && (Flags & TF_Keep)) {
bool UseOdr = (Flags & TF_DependencyWalk) ? (Flags & TF_ODR) : CU.hasODR();
keepDIEAndDependencies(RelocMgr, Die, MyInfo, DMO, CU, UseOdr);
}
if (dieNeedsChildrenToBeMeaningful(Die.getTag()))
Flags &= ~TF_ParentWalk;
if (!Die.hasChildren() || (Flags & TF_ParentWalk))
return;
for (auto *Child = Die.getFirstChild(); Child && !Child->isNULL();
Child = Child->getSibling())
lookForDIEsToKeep(RelocMgr, *Child, DMO, CU, Flags);
}
void DwarfLinker::AssignAbbrev(DIEAbbrev &Abbrev) {
FoldingSetNodeID ID;
Abbrev.Profile(ID);
void *InsertToken;
DIEAbbrev *InSet = AbbreviationsSet.FindNodeOrInsertPos(ID, InsertToken);
if (InSet) {
Abbrev.setNumber(InSet->getNumber());
} else {
Abbreviations.push_back(
llvm::make_unique<DIEAbbrev>(Abbrev.getTag(), Abbrev.hasChildren()));
for (const auto &Attr : Abbrev.getData())
Abbreviations.back()->AddAttribute(Attr.getAttribute(), Attr.getForm());
AbbreviationsSet.InsertNode(Abbreviations.back().get(), InsertToken);
Abbrev.setNumber(Abbreviations.size());
Abbreviations.back()->setNumber(Abbreviations.size());
}
}
unsigned DwarfLinker::DIECloner::cloneStringAttribute(DIE &Die,
AttributeSpec AttrSpec,
const DWARFFormValue &Val,
const DWARFUnit &U,
AttributesInfo &Info) {
const char *String = *Val.getAsCString(&U);
auto StringEntry = Linker.StringPool.getEntry(String);
if (AttrSpec.Attr == dwarf::DW_AT_name)
Info.Name = StringEntry;
else if (AttrSpec.Attr == dwarf::DW_AT_MIPS_linkage_name ||
AttrSpec.Attr == dwarf::DW_AT_linkage_name)
Info.MangledName = StringEntry;
Die.addValue(DIEAlloc, dwarf::Attribute(AttrSpec.Attr), dwarf::DW_FORM_strp,
DIEInteger(StringEntry.getOffset()));
return 4;
}
unsigned DwarfLinker::DIECloner::cloneDieReferenceAttribute(
DIE &Die, const DWARFDebugInfoEntryMinimal &InputDIE,
AttributeSpec AttrSpec, unsigned AttrSize, const DWARFFormValue &Val,
CompileUnit &Unit) {
const DWARFUnit &U = Unit.getOrigUnit();
uint32_t Ref = *Val.getAsReference(&U);
DIE *NewRefDie = nullptr;
CompileUnit *RefUnit = nullptr;
DeclContext *Ctxt = nullptr;
const DWARFDebugInfoEntryMinimal *RefDie =
resolveDIEReference(Linker, CompileUnits, Val, U, InputDIE, RefUnit);
if (!RefDie)
return 0;
unsigned Idx = RefUnit->getOrigUnit().getDIEIndex(RefDie);
CompileUnit::DIEInfo &RefInfo = RefUnit->getInfo(Idx);
if (isODRAttribute(AttrSpec.Attr)) {
Ctxt = RefInfo.Ctxt;
if (Ctxt && Ctxt->getCanonicalDIEOffset()) {
DIEInteger Attr(Ctxt->getCanonicalDIEOffset());
Die.addValue(DIEAlloc, dwarf::Attribute(AttrSpec.Attr),
dwarf::DW_FORM_ref_addr, Attr);
return getRefAddrSize(U);
}
}
if (!RefInfo.Clone) {
assert(Ref > InputDIE.getOffset());
RefInfo.Clone = DIE::get(DIEAlloc, dwarf::Tag(RefDie->getTag()));
}
NewRefDie = RefInfo.Clone;
if (AttrSpec.Form == dwarf::DW_FORM_ref_addr ||
(Unit.hasODR() && isODRAttribute(AttrSpec.Attr))) {
uint64_t Attr;
if (Ref < InputDIE.getOffset()) {
uint32_t NewRefOffset =
RefUnit->getStartOffset() + NewRefDie->getOffset();
Attr = NewRefOffset;
Die.addValue(DIEAlloc, dwarf::Attribute(AttrSpec.Attr),
dwarf::DW_FORM_ref_addr, DIEInteger(Attr));
} else {
Attr = 0xBADDEF;
Unit.noteForwardReference(
NewRefDie, RefUnit, Ctxt,
Die.addValue(DIEAlloc, dwarf::Attribute(AttrSpec.Attr),
dwarf::DW_FORM_ref_addr, DIEInteger(Attr)));
}
return getRefAddrSize(U);
}
Die.addValue(DIEAlloc, dwarf::Attribute(AttrSpec.Attr),
dwarf::Form(AttrSpec.Form), DIEEntry(*NewRefDie));
return AttrSize;
}
unsigned DwarfLinker::DIECloner::cloneBlockAttribute(DIE &Die,
AttributeSpec AttrSpec,
const DWARFFormValue &Val,
unsigned AttrSize) {
DIEValueList *Attr;
DIEValue Value;
DIELoc *Loc = nullptr;
DIEBlock *Block = nullptr;
if (AttrSpec.Form == dwarf::DW_FORM_exprloc) {
Loc = new (DIEAlloc) DIELoc;
Linker.DIELocs.push_back(Loc);
} else {
Block = new (DIEAlloc) DIEBlock;
Linker.DIEBlocks.push_back(Block);
}
Attr = Loc ? static_cast<DIEValueList *>(Loc)
: static_cast<DIEValueList *>(Block);
if (Loc)
Value = DIEValue(dwarf::Attribute(AttrSpec.Attr),
dwarf::Form(AttrSpec.Form), Loc);
else
Value = DIEValue(dwarf::Attribute(AttrSpec.Attr),
dwarf::Form(AttrSpec.Form), Block);
ArrayRef<uint8_t> Bytes = *Val.getAsBlock();
for (auto Byte : Bytes)
Attr->addValue(DIEAlloc, static_cast<dwarf::Attribute>(0),
dwarf::DW_FORM_data1, DIEInteger(Byte));
if (Linker.Streamer) {
auto *AsmPrinter = &Linker.Streamer->getAsmPrinter();
if (Loc)
Loc->ComputeSize(AsmPrinter);
else
Block->ComputeSize(AsmPrinter);
}
Die.addValue(DIEAlloc, Value);
return AttrSize;
}
unsigned DwarfLinker::DIECloner::cloneAddressAttribute(
DIE &Die, AttributeSpec AttrSpec, const DWARFFormValue &Val,
const CompileUnit &Unit, AttributesInfo &Info) {
uint64_t Addr = *Val.getAsAddress(&Unit.getOrigUnit());
if (LLVM_UNLIKELY(Linker.Options.Update)) {
if (AttrSpec.Attr == dwarf::DW_AT_low_pc)
Info.HasLowPc = true;
Die.addValue(DIEAlloc, dwarf::Attribute(AttrSpec.Attr),
dwarf::Form(AttrSpec.Form), DIEInteger(Addr));
return Unit.getOrigUnit().getAddressByteSize();
}
if (AttrSpec.Attr == dwarf::DW_AT_low_pc) {
if (Die.getTag() == dwarf::DW_TAG_inlined_subroutine ||
Die.getTag() == dwarf::DW_TAG_lexical_block)
Addr = (Info.OrigLowPc != UINT64_MAX ? Info.OrigLowPc : Addr) +
Info.PCOffset;
else if (Die.getTag() == dwarf::DW_TAG_compile_unit) {
Addr = Unit.getLowPc();
if (Addr == UINT64_MAX)
return 0;
}
Info.HasLowPc = true;
} else if (AttrSpec.Attr == dwarf::DW_AT_high_pc) {
if (Die.getTag() == dwarf::DW_TAG_compile_unit) {
if (uint64_t HighPc = Unit.getHighPc())
Addr = HighPc;
else
return 0;
} else
Addr = (Info.OrigHighPc ? Info.OrigHighPc : Addr) + Info.PCOffset;
}
Die.addValue(DIEAlloc, static_cast<dwarf::Attribute>(AttrSpec.Attr),
static_cast<dwarf::Form>(AttrSpec.Form), DIEInteger(Addr));
return Unit.getOrigUnit().getAddressByteSize();
}
unsigned DwarfLinker::DIECloner::cloneScalarAttribute(
DIE &Die, const DWARFDebugInfoEntryMinimal &InputDIE, CompileUnit &Unit,
AttributeSpec AttrSpec, const DWARFFormValue &Val, unsigned AttrSize,
AttributesInfo &Info) {
uint64_t Value;
if (LLVM_UNLIKELY(Linker.Options.Update)) {
if (auto OptionalValue = Val.getAsUnsignedConstant())
Value = *OptionalValue;
else if (auto OptionalValue = Val.getAsSignedConstant())
Value = *OptionalValue;
else if (auto OptionalValue = Val.getAsSectionOffset())
Value = *OptionalValue;
else {
Linker.reportWarning(
"Unsupported scalar attribute form. Dropping attribute.",
&Unit.getOrigUnit(), &InputDIE);
return 0;
}
if (AttrSpec.Attr == dwarf::DW_AT_declaration && Value)
Info.IsDeclaration = true;
Die.addValue(DIEAlloc, dwarf::Attribute(AttrSpec.Attr),
dwarf::Form(AttrSpec.Form), DIEInteger(Value));
return AttrSize;
}
if (AttrSpec.Attr == dwarf::DW_AT_high_pc &&
Die.getTag() == dwarf::DW_TAG_compile_unit) {
if (Unit.getLowPc() == -1ULL)
return 0;
Value = Unit.getHighPc() - Unit.getLowPc();
} else if (AttrSpec.Form == dwarf::DW_FORM_sec_offset)
Value = *Val.getAsSectionOffset();
else if (AttrSpec.Form == dwarf::DW_FORM_sdata)
Value = *Val.getAsSignedConstant();
else if (auto OptionalValue = Val.getAsUnsignedConstant())
Value = *OptionalValue;
else {
Linker.reportWarning(
"Unsupported scalar attribute form. Dropping attribute.",
&Unit.getOrigUnit(), &InputDIE);
return 0;
}
PatchLocation Patch =
Die.addValue(DIEAlloc, dwarf::Attribute(AttrSpec.Attr),
dwarf::Form(AttrSpec.Form), DIEInteger(Value));
if (AttrSpec.Attr == dwarf::DW_AT_ranges) {
Unit.noteRangeAttribute(Die, Patch);
Info.HasRanges = true;
}
else if (AttrSpec.Attr == dwarf::DW_AT_location ||
AttrSpec.Attr == dwarf::DW_AT_frame_base)
Unit.noteLocationAttribute(Patch, Info.PCOffset);
else if (AttrSpec.Attr == dwarf::DW_AT_declaration && Value)
Info.IsDeclaration = true;
return AttrSize;
}
unsigned DwarfLinker::DIECloner::cloneAttribute(
DIE &Die, const DWARFDebugInfoEntryMinimal &InputDIE, CompileUnit &Unit,
const DWARFFormValue &Val, const AttributeSpec AttrSpec, unsigned AttrSize,
AttributesInfo &Info) {
const DWARFUnit &U = Unit.getOrigUnit();
switch (AttrSpec.Form) {
case dwarf::DW_FORM_strp:
case dwarf::DW_FORM_string:
return cloneStringAttribute(Die, AttrSpec, Val, U, Info);
case dwarf::DW_FORM_ref_addr:
case dwarf::DW_FORM_ref1:
case dwarf::DW_FORM_ref2:
case dwarf::DW_FORM_ref4:
case dwarf::DW_FORM_ref8:
return cloneDieReferenceAttribute(Die, InputDIE, AttrSpec, AttrSize, Val,
Unit);
case dwarf::DW_FORM_block:
case dwarf::DW_FORM_block1:
case dwarf::DW_FORM_block2:
case dwarf::DW_FORM_block4:
case dwarf::DW_FORM_exprloc:
return cloneBlockAttribute(Die, AttrSpec, Val, AttrSize);
case dwarf::DW_FORM_addr:
return cloneAddressAttribute(Die, AttrSpec, Val, Unit, Info);
case dwarf::DW_FORM_data1:
case dwarf::DW_FORM_data2:
case dwarf::DW_FORM_data4:
case dwarf::DW_FORM_data8:
case dwarf::DW_FORM_udata:
case dwarf::DW_FORM_sdata:
case dwarf::DW_FORM_sec_offset:
case dwarf::DW_FORM_flag:
case dwarf::DW_FORM_flag_present:
return cloneScalarAttribute(Die, InputDIE, Unit, AttrSpec, Val, AttrSize,
Info);
default:
Linker.reportWarning(
"Unsupported attribute form in cloneAttribute. Dropping.", &U,
&InputDIE);
}
return 0;
}
bool DwarfLinker::RelocationManager::
applyValidRelocs(MutableArrayRef<char> Data, uint32_t BaseOffset,
bool isLittleEndian) {
assert((NextValidReloc == 0 ||
BaseOffset > ValidRelocs[NextValidReloc - 1].Offset) &&
"BaseOffset should only be increasing.");
if (NextValidReloc >= ValidRelocs.size())
return false;
while (NextValidReloc < ValidRelocs.size() &&
ValidRelocs[NextValidReloc].Offset < BaseOffset)
++NextValidReloc;
bool Applied = false;
uint64_t EndOffset = BaseOffset + Data.size();
while (NextValidReloc < ValidRelocs.size() &&
ValidRelocs[NextValidReloc].Offset >= BaseOffset &&
ValidRelocs[NextValidReloc].Offset < EndOffset) {
const auto &ValidReloc = ValidRelocs[NextValidReloc++];
assert(ValidReloc.Offset - BaseOffset < Data.size());
assert(ValidReloc.Offset - BaseOffset + ValidReloc.Size <= Data.size());
char Buf[8];
uint64_t Value = ValidReloc.Mapping->getValue().BinaryAddress;
Value += ValidReloc.Addend;
for (unsigned i = 0; i != ValidReloc.Size; ++i) {
unsigned Index = isLittleEndian ? i : (ValidReloc.Size - i - 1);
Buf[i] = uint8_t(Value >> (Index * 8));
}
assert(ValidReloc.Size <= sizeof(Buf));
memcpy(&Data[ValidReloc.Offset - BaseOffset], Buf, ValidReloc.Size);
Applied = true;
}
return Applied;
}
static bool isTypeTag(uint16_t Tag) {
switch (Tag) {
case dwarf::DW_TAG_array_type:
case dwarf::DW_TAG_class_type:
case dwarf::DW_TAG_enumeration_type:
case dwarf::DW_TAG_pointer_type:
case dwarf::DW_TAG_reference_type:
case dwarf::DW_TAG_string_type:
case dwarf::DW_TAG_structure_type:
case dwarf::DW_TAG_subroutine_type:
case dwarf::DW_TAG_typedef:
case dwarf::DW_TAG_union_type:
case dwarf::DW_TAG_ptr_to_member_type:
case dwarf::DW_TAG_set_type:
case dwarf::DW_TAG_subrange_type:
case dwarf::DW_TAG_base_type:
case dwarf::DW_TAG_const_type:
case dwarf::DW_TAG_constant:
case dwarf::DW_TAG_file_type:
case dwarf::DW_TAG_namelist:
case dwarf::DW_TAG_packed_type:
case dwarf::DW_TAG_volatile_type:
case dwarf::DW_TAG_restrict_type:
case dwarf::DW_TAG_interface_type:
case dwarf::DW_TAG_unspecified_type:
case dwarf::DW_TAG_shared_type:
return true;
default:
break;
}
return false;
}
static bool isObjCSelector(StringRef Name) {
return Name.size() > 2 && (Name[0] == '-' || Name[0] == '+') &&
(Name[1] == '[');
}
void DwarfLinker::DIECloner::addObjCAccelerator(CompileUnit &Unit,
const DIE *Die,
DwarfStringPoolEntryRef Name,
bool SkipPubSection) {
assert(isObjCSelector(Name.getString()) && "not an objc selector");
StringRef ClassNameStart(Name.getString().drop_front(2));
size_t FirstSpace = ClassNameStart.find(' ');
if (FirstSpace == StringRef::npos)
return;
StringRef SelectorStart(ClassNameStart.data() + FirstSpace + 1);
if (!SelectorStart.size())
return;
StringRef Selector(SelectorStart.data(), SelectorStart.size() - 1);
Unit.addNameAccelerator(Die, Linker.StringPool.getEntry(Selector),
SkipPubSection);
StringRef ClassName(ClassNameStart.data(), FirstSpace);
Unit.addObjCAccelerator(Die, Linker.StringPool.getEntry(ClassName),
SkipPubSection);
if (ClassName[ClassName.size() - 1] == ')') {
size_t OpenParens = ClassName.find('(');
if (OpenParens != StringRef::npos) {
StringRef ClassNameNoCategory(ClassName.data(), OpenParens);
Unit.addObjCAccelerator(
Die, Linker.StringPool.getEntry(ClassNameNoCategory), SkipPubSection);
std::string MethodNameNoCategory(Name.getString().data(), OpenParens + 2);
MethodNameNoCategory.append(SelectorStart);
Unit.addNameAccelerator(Die,
Linker.StringPool.getEntry(MethodNameNoCategory),
SkipPubSection);
}
}
}
static bool
shouldSkipAttribute(DWARFAbbreviationDeclaration::AttributeSpec AttrSpec,
uint16_t Tag, bool InDebugMap, bool SkipPC,
bool InFunctionScope) {
switch (AttrSpec.Attr) {
default:
return false;
case dwarf::DW_AT_low_pc:
case dwarf::DW_AT_high_pc:
case dwarf::DW_AT_ranges:
return SkipPC;
case dwarf::DW_AT_location:
case dwarf::DW_AT_frame_base:
return (SkipPC || (!InFunctionScope && Tag == dwarf::DW_TAG_variable &&
!InDebugMap)) &&
!DWARFFormValue(AttrSpec.Form).isFormClass(DWARFFormValue::FC_Block);
}
}
DIE *DwarfLinker::DIECloner::cloneDIE(
const DWARFDebugInfoEntryMinimal &InputDIE, CompileUnit &Unit,
int64_t PCOffset, uint32_t OutOffset, unsigned Flags) {
DWARFUnit &U = Unit.getOrigUnit();
unsigned Idx = U.getDIEIndex(&InputDIE);
CompileUnit::DIEInfo &Info = Unit.getInfo(Idx);
if (!Unit.getInfo(Idx).Keep)
return nullptr;
uint32_t Offset = InputDIE.getOffset();
DIE *Die = Info.Clone;
if (!Die)
Die = Info.Clone = DIE::get(DIEAlloc, dwarf::Tag(InputDIE.getTag()));
assert(Die->getTag() == InputDIE.getTag());
Die->setOffset(OutOffset);
if ((Unit.hasODR() || Unit.isClangModule()) &&
Die->getTag() != dwarf::DW_TAG_namespace && Info.Ctxt &&
Info.Ctxt != Unit.getInfo(Info.ParentIdx).Ctxt &&
!Info.Ctxt->getCanonicalDIEOffset()) {
Info.Ctxt->setCanonicalDIEOffset(OutOffset + Unit.getStartOffset());
}
DataExtractor Data = U.getDebugInfoExtractor();
uint32_t NextOffset =
(Idx + 1 < U.getNumDIEs())
? U.getDIEAtIndex(Idx + 1)->getOffset()
: U.getNextUnitOffset();
AttributesInfo AttrInfo;
SmallString<40> DIECopy(Data.getData().substr(Offset, NextOffset - Offset));
Data = DataExtractor(DIECopy, Data.isLittleEndian(), Data.getAddressSize());
if (RelocMgr.applyValidRelocs(DIECopy, Offset, Data.isLittleEndian())) {
AttrInfo.OrigHighPc =
InputDIE.getAttributeValueAsAddress(&U, dwarf::DW_AT_high_pc, 0);
AttrInfo.OrigLowPc =
InputDIE.getAttributeValueAsAddress(&U, dwarf::DW_AT_low_pc, UINT64_MAX);
}
Offset = 0;
const auto *Abbrev = InputDIE.getAbbreviationDeclarationPtr();
Offset += getULEB128Size(Abbrev->getCode());
if (Die->getTag() == dwarf::DW_TAG_subprogram)
PCOffset = Info.AddrAdjust;
AttrInfo.PCOffset = PCOffset;
if (Abbrev->getTag() == dwarf::DW_TAG_subprogram) {
Flags |= TF_InFunctionScope;
if (!Info.InDebugMap && LLVM_LIKELY(!Options.Update))
Flags |= TF_SkipPC;
}
bool Copied = false;
for (const auto &AttrSpec : Abbrev->attributes()) {
if (LLVM_LIKELY(!Options.Update) &&
shouldSkipAttribute(AttrSpec, Die->getTag(), Info.InDebugMap,
Flags & TF_SkipPC, Flags & TF_InFunctionScope)) {
DWARFFormValue::skipValue(AttrSpec.Form, Data, &Offset, &U);
if (!Copied) {
copyAbbrev(*InputDIE.getAbbreviationDeclarationPtr(), Unit.hasODR());
Copied = true;
}
continue;
}
DWARFFormValue Val(AttrSpec.Form);
uint32_t AttrSize = Offset;
Val.extractValue(Data, &Offset, &U);
AttrSize = Offset - AttrSize;
OutOffset +=
cloneAttribute(*Die, InputDIE, Unit, Val, AttrSpec, AttrSize, AttrInfo);
}
uint16_t Tag = InputDIE.getTag();
if ((Info.InDebugMap || AttrInfo.HasLowPc || AttrInfo.HasRanges) &&
Tag != dwarf::DW_TAG_compile_unit &&
getDIENames(InputDIE, Unit.getOrigUnit(), AttrInfo,
Tag != dwarf::DW_TAG_inlined_subroutine)) {
if (AttrInfo.MangledName && AttrInfo.MangledName != AttrInfo.Name)
Unit.addNameAccelerator(Die, AttrInfo.MangledName,
Tag == dwarf::DW_TAG_inlined_subroutine);
if (AttrInfo.Name) {
if (AttrInfo.NameWithoutTemplate)
Unit.addNameAccelerator(Die, AttrInfo.NameWithoutTemplate,
true);
Unit.addNameAccelerator(Die, AttrInfo.Name,
Tag == dwarf::DW_TAG_inlined_subroutine);
}
if (AttrInfo.Name && isObjCSelector(AttrInfo.Name.getString()))
addObjCAccelerator(Unit, Die, AttrInfo.Name, true);
} else if (Tag == dwarf::DW_TAG_namespace) {
if (!AttrInfo.Name)
AttrInfo.Name = Linker.StringPool.getEntry("(anonymous namespace)");
Unit.addNamespaceAccelerator(Die, AttrInfo.Name);
} else if (isTypeTag(Tag) && !AttrInfo.IsDeclaration &&
getDIENames(InputDIE, Unit.getOrigUnit(), AttrInfo) &&
AttrInfo.Name && AttrInfo.Name.getString()[0]) {
uint32_t Hash = hashFullyQualifiedName(&InputDIE, Unit);
uint64_t RuntimeLang = InputDIE.getAttributeValueAsUnsignedConstant(
&U, dwarf::DW_AT_APPLE_runtime_class, 0);
bool ObjCClassIsImplementation =
(RuntimeLang == dwarf::DW_LANG_ObjC ||
RuntimeLang == dwarf::DW_LANG_ObjC_plus_plus) &&
InputDIE.getAttributeValueAsUnsignedConstant(
&U, dwarf::DW_AT_APPLE_objc_complete_type, 0);
Unit.addTypeAccelerator(Die, AttrInfo.Name, ObjCClassIsImplementation,
Hash);
}
bool HasChildren = false;
for (auto *Child = InputDIE.getFirstChild(); Child && !Child->isNULL();
Child = Child->getSibling()) {
unsigned Idx = U.getDIEIndex(Child);
if (Unit.getInfo(Idx).Keep) {
HasChildren = true;
break;
}
}
DIEAbbrev NewAbbrev = Die->generateAbbrev();
if (HasChildren)
NewAbbrev.setChildrenFlag(dwarf::DW_CHILDREN_yes);
Linker.AssignAbbrev(NewAbbrev);
Die->setAbbrevNumber(NewAbbrev.getNumber());
OutOffset += getULEB128Size(Die->getAbbrevNumber());
if (!HasChildren) {
Die->setSize(OutOffset - Die->getOffset());
return Die;
}
for (auto *Child = InputDIE.getFirstChild(); Child && !Child->isNULL();
Child = Child->getSibling()) {
if (DIE *Clone = cloneDIE(*Child, Unit, PCOffset, OutOffset, Flags)) {
Die->addChild(Clone);
OutOffset = Clone->getOffset() + Clone->getSize();
}
}
OutOffset += sizeof(int8_t);
Die->setSize(OutOffset - Die->getOffset());
return Die;
}
void DwarfLinker::patchRangesForUnit(const CompileUnit &Unit,
DWARFContext &OrigDwarf) const {
DWARFDebugRangeList RangeList;
const auto &FunctionRanges = Unit.getFunctionRanges();
unsigned AddressSize = Unit.getOrigUnit().getAddressByteSize();
DataExtractor RangeExtractor(OrigDwarf.getRangeSection(),
OrigDwarf.isLittleEndian(), AddressSize);
auto InvalidRange = FunctionRanges.end(), CurrRange = InvalidRange;
DWARFUnit &OrigUnit = Unit.getOrigUnit();
const auto *OrigUnitDie = OrigUnit.getUnitDIE(false);
uint64_t OrigLowPc = OrigUnitDie->getAttributeValueAsAddress(
&OrigUnit, dwarf::DW_AT_low_pc, -1ULL);
int64_t UnitPcOffset = 0;
if (OrigLowPc != -1ULL)
UnitPcOffset = int64_t(OrigLowPc) - Unit.getLowPc();
for (const auto &RangeAttribute : Unit.getRangesAttributes()) {
uint32_t Offset = RangeAttribute.get();
RangeAttribute.set(Streamer->getRangesSectionSize());
RangeList.extract(RangeExtractor, &Offset);
const auto &Entries = RangeList.getEntries();
if (!Entries.empty()) {
const DWARFDebugRangeList::RangeListEntry &First = Entries.front();
if (CurrRange == InvalidRange ||
First.StartAddress + OrigLowPc < CurrRange.start() ||
First.StartAddress + OrigLowPc >= CurrRange.stop()) {
CurrRange = FunctionRanges.find(First.StartAddress + OrigLowPc);
if (CurrRange == InvalidRange ||
CurrRange.start() > First.StartAddress + OrigLowPc) {
reportWarning("no mapping for range.");
continue;
}
}
}
Streamer->emitRangesEntries(UnitPcOffset, OrigLowPc, CurrRange, Entries,
AddressSize);
}
}
void DwarfLinker::generateUnitRanges(CompileUnit &Unit) const {
auto Attr = Unit.getUnitRangesAttribute();
if (Attr)
Attr->set(Streamer->getRangesSectionSize());
Streamer->emitUnitRangesEntries(Unit, static_cast<bool>(Attr));
}
static void insertLineSequence(std::vector<DWARFDebugLine::Row> &Seq,
std::vector<DWARFDebugLine::Row> &Rows) {
if (Seq.empty())
return;
if (!Rows.empty() && Rows.back().Address < Seq.front().Address) {
Rows.insert(Rows.end(), Seq.begin(), Seq.end());
Seq.clear();
return;
}
auto InsertPoint = std::lower_bound(
Rows.begin(), Rows.end(), Seq.front(),
[](const DWARFDebugLine::Row &LHS, const DWARFDebugLine::Row &RHS) {
return LHS.Address < RHS.Address;
});
if (InsertPoint != Rows.end() &&
InsertPoint->Address == Seq.front().Address && InsertPoint->EndSequence) {
*InsertPoint = Seq.front();
Rows.insert(InsertPoint + 1, Seq.begin() + 1, Seq.end());
} else {
Rows.insert(InsertPoint, Seq.begin(), Seq.end());
}
Seq.clear();
}
static void patchStmtList(DIE &Die, DIEInteger Offset) {
for (auto &V : Die.values())
if (V.getAttribute() == dwarf::DW_AT_stmt_list) {
V = DIEValue(V.getAttribute(), V.getForm(), Offset);
return;
}
llvm_unreachable("Didn't find DW_AT_stmt_list in cloned DIE!");
}
void DwarfLinker::patchLineTableForUnit(CompileUnit &Unit,
DWARFContext &OrigDwarf) {
const DWARFDebugInfoEntryMinimal *CUDie = Unit.getOrigUnit().getUnitDIE();
uint64_t StmtList = CUDie->getAttributeValueAsSectionOffset(
&Unit.getOrigUnit(), dwarf::DW_AT_stmt_list, -1ULL);
if (StmtList == -1ULL)
return;
if (auto *OutputDIE = Unit.getOutputUnitDIE())
patchStmtList(*OutputDIE, DIEInteger(Streamer->getLineSectionSize()));
DWARFDebugLine::LineTable LineTable;
uint32_t StmtOffset = StmtList;
StringRef LineData = OrigDwarf.getLineSection().Data;
DataExtractor LineExtractor(LineData, OrigDwarf.isLittleEndian(),
Unit.getOrigUnit().getAddressByteSize());
if (Options.Translator)
return Streamer->translateLineTable(LineExtractor, StmtList, Options);
LineTable.parse(LineExtractor, &OrigDwarf.getLineSection().Relocs,
&StmtOffset);
std::vector<DWARFDebugLine::Row> NewRows;
NewRows.reserve(LineTable.Rows.size());
std::vector<DWARFDebugLine::Row> Seq;
const auto &FunctionRanges = Unit.getFunctionRanges();
auto InvalidRange = FunctionRanges.end(), CurrRange = InvalidRange;
for (auto &Row : LineTable.Rows) {
if (CurrRange == InvalidRange || Row.Address < CurrRange.start() ||
Row.Address > CurrRange.stop() ||
(Row.Address == CurrRange.stop() && !Row.EndSequence)) {
uint64_t StopAddress = CurrRange != InvalidRange
? CurrRange.stop() + CurrRange.value()
: -1ULL;
CurrRange = FunctionRanges.find(Row.Address);
bool CurrRangeValid =
CurrRange != InvalidRange && CurrRange.start() <= Row.Address;
if (!CurrRangeValid) {
CurrRange = InvalidRange;
if (StopAddress != -1ULL) {
auto Range = Ranges.lower_bound(Row.Address);
if (Range != Ranges.begin() && Range != Ranges.end())
--Range;
if (Range != Ranges.end() && Range->first <= Row.Address &&
Range->second.first >= Row.Address) {
StopAddress = Row.Address + Range->second.second;
}
}
}
if (StopAddress != -1ULL && !Seq.empty()) {
auto NextLine = Seq.back();
NextLine.Address = StopAddress;
NextLine.EndSequence = 1;
NextLine.PrologueEnd = 0;
NextLine.BasicBlock = 0;
NextLine.EpilogueBegin = 0;
Seq.push_back(NextLine);
insertLineSequence(Seq, NewRows);
}
if (!CurrRangeValid)
continue;
}
if (Row.EndSequence && Seq.empty())
continue;
Row.Address += CurrRange.value();
Seq.emplace_back(Row);
if (Row.EndSequence)
insertLineSequence(Seq, NewRows);
}
uint32_t PrologueEnd = StmtList + 10 + LineTable.Prologue.PrologueLength;
if (LineTable.Prologue.Version != 2 ||
LineTable.Prologue.DefaultIsStmt != DWARF2_LINE_DEFAULT_IS_STMT ||
LineTable.Prologue.OpcodeBase > 13)
reportWarning("line table paramters mismatch. Cannot emit.");
else {
MCDwarfLineTableParams Params;
Params.DWARF2LineOpcodeBase = LineTable.Prologue.OpcodeBase;
Params.DWARF2LineBase = LineTable.Prologue.LineBase;
Params.DWARF2LineRange = LineTable.Prologue.LineRange;
Streamer->emitLineTableForUnit(Params,
LineData.slice(StmtList + 4, PrologueEnd),
LineTable.Prologue.MinInstLength, NewRows,
Unit.getOrigUnit().getAddressByteSize());
}
}
void DwarfLinker::emitAcceleratorEntriesForUnit(CompileUnit &Unit) {
for (const auto &Namespace : Unit.getNamespaces())
AppleNamespaces.AddName(Namespace.Name,
Namespace.Die->getOffset() + Unit.getStartOffset());
if (!Options.Minimize)
Streamer->emitPubNamesForUnit(Unit);
for (const auto &Pubname : Unit.getPubnames())
AppleNames.AddName(Pubname.Name,
Pubname.Die->getOffset() + Unit.getStartOffset());
if (!Options.Minimize)
Streamer->emitPubTypesForUnit(Unit);
for (const auto &Pubtype : Unit.getPubtypes())
AppleTypes.AddType(
Pubtype.Name, Pubtype.Die->getOffset() + Unit.getStartOffset(),
Pubtype.Die->getTag(),
Pubtype.ObjcClassImplementation ? dwarf::DW_FLAG_type_implementation
: 0,
Pubtype.QualifiedNameHash);
for (const auto &ObjC : Unit.getObjC())
AppleObjc.AddName(ObjC.Name, ObjC.Die->getOffset() + Unit.getStartOffset());
}
void DwarfLinker::patchFrameInfoForObject(const DebugMapObject &DMO,
DWARFContext &OrigDwarf,
unsigned AddrSize) {
StringRef FrameData = OrigDwarf.getDebugFrameSection();
if (FrameData.empty())
return;
DataExtractor Data(FrameData, OrigDwarf.isLittleEndian(), 0);
uint32_t InputOffset = 0;
DenseMap<uint32_t, StringRef> LocalCIES;
while (Data.isValidOffset(InputOffset)) {
uint32_t EntryOffset = InputOffset;
uint32_t InitialLength = Data.getU32(&InputOffset);
if (InitialLength == 0xFFFFFFFF)
return reportWarning("Dwarf64 bits no supported");
uint32_t CIEId = Data.getU32(&InputOffset);
if (CIEId == 0xFFFFFFFF) {
StringRef CIEData = FrameData.substr(EntryOffset, InitialLength + 4);
LocalCIES[EntryOffset] = CIEData;
InputOffset += InitialLength - 4;
continue;
}
uint32_t Loc = Data.getUnsigned(&InputOffset, AddrSize);
auto Range = Ranges.upper_bound(Loc);
if (Range != Ranges.begin())
--Range;
if (Range == Ranges.end() || Range->first > Loc ||
Range->second.first <= Loc) {
InputOffset = EntryOffset + InitialLength + 4;
continue;
}
StringRef CIEData = LocalCIES[CIEId];
if (CIEData.empty())
return reportWarning("Inconsistent debug_frame content. Dropping.");
auto IteratorInserted = EmittedCIEs.insert(
std::make_pair(CIEData, Streamer->getFrameSectionSize()));
if (IteratorInserted.second ||
LastCIEOffset != IteratorInserted.first->getValue()) {
LastCIEOffset = Streamer->getFrameSectionSize();
IteratorInserted.first->getValue() = LastCIEOffset;
Streamer->emitCIE(CIEData);
}
unsigned FDERemainingBytes = InitialLength - (4 + AddrSize);
Streamer->emitFDE(IteratorInserted.first->getValue(), AddrSize,
Loc + Range->second.second,
FrameData.substr(InputOffset, FDERemainingBytes));
InputOffset += FDERemainingBytes;
}
}
uint32_t DwarfLinker::DIECloner::hashFullyQualifiedName(
const DWARFDebugInfoEntryMinimal *DIE, CompileUnit &U, int RecurseDepth) {
const char *Name = nullptr;
DWARFUnit *OrigUnit = &U.getOrigUnit();
CompileUnit *CU = &U;
DWARFFormValue Ref;
while (1) {
if (const char *CurrentName =
DIE->getName(&U.getOrigUnit(), DINameKind::ShortName))
Name = CurrentName;
if (!DIE->getAttributeValue(OrigUnit, dwarf::DW_AT_specification, Ref) &&
!DIE->getAttributeValue(OrigUnit, dwarf::DW_AT_abstract_origin, Ref))
break;
if (!Ref.isFormClass(DWARFFormValue::FC_Reference))
break;
CompileUnit *RefCU;
if (auto *RefDIE = resolveDIEReference(Linker, CompileUnits, Ref,
U.getOrigUnit(), *DIE, RefCU)) {
CU = RefCU;
OrigUnit = &RefCU->getOrigUnit();
DIE = RefDIE;
}
}
unsigned Idx = OrigUnit->getDIEIndex(DIE);
if (!Name && DIE->getTag() == dwarf::DW_TAG_namespace)
Name = "(anonymous namespace)";
if (CU->getInfo(Idx).ParentIdx == 0 ||
CU->getOrigUnit().getDIEAtIndex(CU->getInfo(Idx).ParentIdx)->getTag() ==
dwarf::DW_TAG_module)
return DwarfAccelTable::HashDJB(
Name ? Name : "", DwarfAccelTable::HashDJB(RecurseDepth ? "" : "::"));
return DwarfAccelTable::HashDJB(
(Name ? Name : ""),
DwarfAccelTable::HashDJB(
(Name ? "::" : ""),
hashFullyQualifiedName(
OrigUnit->getDIEAtIndex(CU->getInfo(Idx).ParentIdx), *CU,
++RecurseDepth)));
}
void DwarfLinker::DIECloner::copyAbbrev(
const DWARFAbbreviationDeclaration &Abbrev, bool hasODR) {
DIEAbbrev Copy(dwarf::Tag(Abbrev.getTag()),
dwarf::Form(Abbrev.hasChildren()));
for (const auto &Attr : Abbrev.attributes()) {
uint16_t Form = Attr.Form;
if (hasODR && isODRAttribute(Attr.Attr))
Form = dwarf::DW_FORM_ref_addr;
Copy.AddAttribute(dwarf::Attribute(Attr.Attr), dwarf::Form(Form));
}
Linker.AssignAbbrev(Copy);
}
static uint64_t getDwoId(const DWARFDebugInfoEntryMinimal &CUDie,
const DWARFUnit &Unit) {
uint64_t DwoId =
CUDie.getAttributeValueAsUnsignedConstant(&Unit, dwarf::DW_AT_dwo_id, 0);
if (!DwoId)
DwoId = CUDie.getAttributeValueAsUnsignedConstant(&Unit,
dwarf::DW_AT_GNU_dwo_id, 0);
return DwoId;
}
bool DwarfLinker::registerModuleReference(
const DWARFDebugInfoEntryMinimal &CUDie, const DWARFUnit &Unit,
DebugMap &ModuleMap, unsigned Indent) {
std::string PCMfile =
CUDie.getAttributeValueAsString(&Unit, dwarf::DW_AT_dwo_name, "");
if (PCMfile.empty())
PCMfile =
CUDie.getAttributeValueAsString(&Unit, dwarf::DW_AT_GNU_dwo_name, "");
if (PCMfile.empty())
return false;
std::string PCMpath =
CUDie.getAttributeValueAsString(&Unit, dwarf::DW_AT_comp_dir, "");
uint64_t DwoId = getDwoId(CUDie, Unit);
std::string Name =
CUDie.getAttributeValueAsString(&Unit, dwarf::DW_AT_name, "");
if (Name.empty()) {
reportWarning("Anonymous module skeleton CU for " + PCMfile);
return true;
}
if (Options.Verbose) {
outs().indent(Indent);
outs() << "Found clang module reference " << PCMfile;
}
auto Cached = ClangModules.find(PCMfile);
if (Cached != ClangModules.end()) {
if (Cached->second != DwoId)
reportWarning(Twine("hash mismatch: this object file was built against a "
"different version of the module ") + PCMfile);
if (Options.Verbose)
outs() << " [cached].\n";
return true;
}
if (Options.Verbose)
outs() << " ...\n";
ClangModules.insert({PCMfile, DwoId});
loadClangModule(PCMfile, PCMpath, Name, DwoId, ModuleMap, Indent + 2);
return true;
}
ErrorOr<const object::ObjectFile &>
DwarfLinker::loadObject(BinaryHolder &BinaryHolder, DebugMapObject &Obj,
const DebugMap &Map) {
auto ErrOrObjs =
BinaryHolder.GetObjectFiles(Obj.getObjectFilename(), Obj.getTimestamp());
if (std::error_code EC = ErrOrObjs.getError()) {
reportWarning(Twine(Obj.getObjectFilename()) + ": " + EC.message());
return EC;
}
auto ErrOrObj = BinaryHolder.Get(Map.getTriple());
if (std::error_code EC = ErrOrObj.getError())
reportWarning(Twine(Obj.getObjectFilename()) + ": " + EC.message());
return ErrOrObj;
}
void DwarfLinker::loadClangModule(StringRef Filename, StringRef ModulePath,
StringRef ModuleName, uint64_t DwoId,
DebugMap &ModuleMap, unsigned Indent) {
SmallString<80> Path(Options.PrependPath);
if (sys::path::is_relative(Filename))
sys::path::append(Path, ModulePath, Filename);
else
sys::path::append(Path, Filename);
BinaryHolder ObjHolder(Options.Verbose);
auto &Obj =
ModuleMap.addDebugMapObject(Path, sys::TimeValue::PosixZeroTime());
auto ErrOrObj = loadObject(ObjHolder, Obj, ModuleMap);
if (!ErrOrObj) {
StringRef ObjFile = CurrentDebugObject->getObjectFilename();
bool isClangModule = sys::path::extension(Filename).equals(".pcm");
bool isArchive = ObjFile.endswith(")");
if (isClangModule) {
sys::path::remove_filename(Path);
StringRef ModuleCacheDir = sys::path::parent_path(Path);
if (sys::fs::exists(ModuleCacheDir)) {
if (!ModuleCacheHintDisplayed) {
errs() << "note: The clang module cache may have expired since this "
"object file was built. Rebuilding the object file will "
"rebuild the module cache.\n";
ModuleCacheHintDisplayed = true;
}
} else if (isArchive) {
if (!ArchiveHintDisplayed) {
errs() << "note: Module debugging should be disabled when shipping "
"static libraries.\n";
ArchiveHintDisplayed = true;
}
}
}
return;
}
std::unique_ptr<CompileUnit> Unit;
DWARFContextInMemory DwarfContext(*ErrOrObj);
RelocationManager RelocMgr(*this);
for (const auto &CU : DwarfContext.compile_units()) {
auto *CUDie = CU->getUnitDIE(false);
if (!CUDie)
continue;
if (!registerModuleReference(*CUDie, *CU, ModuleMap, Indent)) {
if (Unit) {
errs() << Filename << ": Clang modules are expected to have exactly"
<< " 1 compile unit.\n";
exitDsymutil(1);
}
if (getDwoId(*CUDie, *CU) != DwoId)
reportWarning(
Twine("hash mismatch: this object file was built against a "
"different version of the module ") + Filename);
Unit = llvm::make_unique<CompileUnit>(*CU, UnitID++, !Options.NoODR,
ModuleName);
analyzeContextInfo(CUDie, 0, *Unit, &ODRContexts.getRoot(), StringPool,
ODRContexts);
Unit->markEverythingAsKept();
}
}
if (Options.Verbose) {
outs().indent(Indent);
outs() << "cloning .debug_info from " << Filename << "\n";
}
DIECloner(*this, RelocMgr, DIEAlloc, MutableArrayRef<CompileUnit>(*Unit),
Options)
.cloneAllCompileUnits(DwarfContext);
}
void DwarfLinker::DIECloner::cloneAllCompileUnits(
DWARFContextInMemory &DwarfContext) {
if (!Linker.Streamer)
return;
for (auto &CurrentUnit : CompileUnits) {
const auto *InputDIE = CurrentUnit.getOrigUnit().getUnitDIE();
CurrentUnit.setStartOffset(Linker.OutputDebugInfoSize);
if (!InputDIE) {
CurrentUnit.setOutputUnitDIE(nullptr);
Linker.OutputDebugInfoSize = CurrentUnit.computeNextUnitOffset();
continue;
}
DIE *OutputDIE = cloneDIE(*InputDIE, CurrentUnit, 0 ,
11 , 0);
CurrentUnit.setOutputUnitDIE(OutputDIE);
Linker.OutputDebugInfoSize = CurrentUnit.computeNextUnitOffset();
if (Linker.Options.NoOutput)
continue;
if (!Linker.Options.Update || Linker.Options.Translator)
Linker.patchLineTableForUnit(CurrentUnit, DwarfContext);
if (!OutputDIE)
continue;
Linker.emitAcceleratorEntriesForUnit(CurrentUnit);
if (Linker.Options.Update)
continue;
Linker.patchRangesForUnit(CurrentUnit, DwarfContext);
Linker.Streamer->emitLocationsForUnit(CurrentUnit, DwarfContext);
}
if (Linker.Options.NoOutput)
return;
for (auto &CurrentUnit : CompileUnits) {
if (!Linker.Options.Update)
Linker.generateUnitRanges(CurrentUnit);
CurrentUnit.fixupForwardReferences();
Linker.Streamer->emitCompileUnitHeader(CurrentUnit);
if (!CurrentUnit.getOutputUnitDIE())
continue;
Linker.Streamer->emitDIE(*CurrentUnit.getOutputUnitDIE());
}
}
bool DwarfLinker::emitBNIWarnings(const DebugMapObject &DMO,
const DebugMap &Map) {
if (DMO.getWarnings().empty() || !DMO.empty())
return false;
Streamer->switchToDebugInfoSection( 2);
DIE *CUDie = DIE::get(DIEAlloc, dwarf::DW_TAG_compile_unit);
CUDie->setOffset(11);
StringRef Producer = StringPool.internString("llvm-dsymutil");
StringRef File = StringPool.internString(DMO.getObjectFilename());
CUDie->addValue(DIEAlloc, dwarf::DW_AT_producer, dwarf::DW_FORM_strp,
DIEInteger(StringPool.getStringOffset(Producer)));
DIEBlock *String = new (DIEAlloc) DIEBlock();
DIEBlocks.push_back(String);
for (auto &C : File)
String->addValue(DIEAlloc, dwarf::Attribute(0), dwarf::DW_FORM_data1,
DIEInteger(C));
String->addValue(DIEAlloc, dwarf::Attribute(0), dwarf::DW_FORM_data1,
DIEInteger(0));
CUDie->addValue(DIEAlloc, dwarf::DW_AT_name, dwarf::DW_FORM_string, String);
for (const auto &Warning : DMO.getWarnings()) {
DIE &ConstDie = CUDie->addChild(DIE::get(DIEAlloc, dwarf::DW_TAG_constant));
ConstDie.addValue(
DIEAlloc, dwarf::DW_AT_name, dwarf::DW_FORM_strp,
DIEInteger(StringPool.getStringOffset("dsymutil_warning")));
ConstDie.addValue(DIEAlloc, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag,
DIEInteger(1));
ConstDie.addValue(DIEAlloc, dwarf::DW_AT_const_value, dwarf::DW_FORM_strp,
DIEInteger(StringPool.getStringOffset(Warning)));
}
unsigned Size = 4 + File.size() + 1 +
DMO.getWarnings().size() * (4 + 1 + 4) +
1 ;
DIEAbbrev Abbrev = CUDie->generateAbbrev();
AssignAbbrev(Abbrev);
CUDie->setAbbrevNumber(Abbrev.getNumber());
Size += getULEB128Size(Abbrev.getNumber());
for (auto &Child : CUDie->children()) {
Abbrev = Child.generateAbbrev();
AssignAbbrev(Abbrev);
Child.setAbbrevNumber(Abbrev.getNumber());
Size += getULEB128Size(Abbrev.getNumber());
}
CUDie->setSize(Size);
auto &Asm = Streamer->getAsmPrinter();
Asm.EmitInt32(11 + CUDie->getSize() - 4);
Asm.EmitInt16(2);
Asm.EmitInt32(0);
Asm.EmitInt8(Map.getTriple().isArch64Bit() ? 8 : 4);
Streamer->emitDIE(*CUDie);
OutputDebugInfoSize += 11 + Size;
return true;
}
bool DwarfLinker::link(const DebugMap &Map) {
if (!createStreamer(Map.getTriple(), OutputFilename))
return false;
OutputDebugInfoSize = 0;
UnitID = 0;
DebugMap ModuleMap(Map.getTriple(), Map.getBinaryPath());
for (const auto &Obj : Map.objects()) {
CurrentDebugObject = Obj.get();
if (Options.Verbose)
outs() << "DEBUG MAP OBJECT: " << Obj->getObjectFilename() << "\n";
if (Obj->isSwiftModule()) {
StringRef File = Obj->getObjectFilename();
auto ErrorOrMem = MemoryBuffer::getFile(File);
if (!ErrorOrMem) {
errs() << "Warning: Could not open " << File << "\n";
continue;
}
sys::fs::file_status Stat;
if (auto errc = sys::fs::status(File, Stat)) {
errs() << "Warning: " << errc.message() << "\n";
continue;
}
if (Stat.getLastModificationTime() != Obj->getTimestamp()) {
errs() << "Warning: Timestamp mismatch for " << File << "\n";
continue;
}
Streamer->emitSwiftModule((*ErrorOrMem)->getBuffer());
continue;
}
if (emitBNIWarnings(*Obj, Map))
continue;
auto ErrOrObj = loadObject(BinHolder, *Obj, Map);
if (!ErrOrObj)
continue;
RelocationManager RelocMgr(*this);
if (!Options.Update &&
!RelocMgr.findValidRelocsInDebugInfo(*ErrOrObj, *Obj)) {
if (Options.Verbose)
outs() << "No valid relocations found. Skipping.\n";
continue;
}
DWARFContextInMemory DwarfContext(*ErrOrObj);
startDebugObject(DwarfContext, *Obj);
for (const auto &CU : DwarfContext.compile_units()) {
auto *CUDie = CU->getUnitDIE(false);
if (Options.Verbose) {
outs() << "Input compilation unit:";
if (CUDie)
CUDie->dump(outs(), CU.get(), 0);
}
if (!CUDie || Options.Update ||
!registerModuleReference(*CUDie, *CU, ModuleMap))
Units.emplace_back(*CU, UnitID++, !Options.NoODR && !Options.Update,
"");
}
for (auto &CurrentUnit : Units) {
auto *CUDie = CurrentUnit.getOrigUnit().getUnitDIE();
if (!CUDie)
continue;
analyzeContextInfo(CUDie, 0, CurrentUnit, &ODRContexts.getRoot(),
StringPool, ODRContexts);
}
if (Options.Update) {
for (auto &Unit : Units)
Unit.markEverythingAsKept();
Streamer->copyInvariantDebugSection(*ErrOrObj, Options);
} else {
for (auto &CurrentUnit : Units)
lookForDIEsToKeep(RelocMgr, *CurrentUnit.getOrigUnit().getUnitDIE(),
*Obj, CurrentUnit, 0);
}
RelocMgr.resetValidRelocs();
if (RelocMgr.hasValidRelocs() || Options.Update)
DIECloner(*this, RelocMgr, DIEAlloc, Units, Options)
.cloneAllCompileUnits(DwarfContext);
if (!Options.NoOutput && !Units.empty() && !Options.Update)
patchFrameInfoForObject(*Obj, DwarfContext,
Units[0].getOrigUnit().getAddressByteSize());
endDebugObject();
}
if (!Options.NoOutput) {
Streamer->emitAbbrevs(Abbreviations);
Streamer->emitStrings(StringPool);
Streamer->emitAppleNames(AppleNames);
Streamer->emitAppleNamespaces(AppleNamespaces);
Streamer->emitAppleTypes(AppleTypes);
Streamer->emitAppleObjc(AppleObjc);
}
return Options.NoOutput ? true : Streamer->finish(Map, Options.Translator);
}
}
DwarfStringPoolEntryRef NonRelocatableStringpool::getEntry(StringRef S) {
if (S.empty() && !Strings.empty())
return EmptyString;
if (Translator)
S = Translator(S);
auto I = Strings.insert(std::make_pair(S, DwarfStringPoolEntry()));
auto &Entry = I.first->second;
if (I.second || Entry.Index == -1U) {
Entry.Index = NumEntries++;
Entry.Offset = CurrentEndOffset;
Entry.Symbol = nullptr;
CurrentEndOffset += S.size() + 1;
}
return DwarfStringPoolEntryRef(*I.first);
}
uint32_t NonRelocatableStringpool::getStringOffset(StringRef S) {
return getEntry(S).getOffset();
}
StringRef NonRelocatableStringpool::internString(StringRef S) {
DwarfStringPoolEntry Entry{nullptr, 0, -1U};
if (Translator)
S = Translator(S);
auto InsertResult = Strings.insert(std::make_pair(S, Entry));
return InsertResult.first->getKey();
}
std::vector<DwarfStringPoolEntryRef>
NonRelocatableStringpool::getEntries() const {
std::vector<DwarfStringPoolEntryRef> Result;
Result.reserve(Strings.size());
for (const auto &E : Strings)
Result.emplace_back(E);
std::sort(Result.begin(), Result.end(), [](const DwarfStringPoolEntryRef A,
const DwarfStringPoolEntryRef B) {
return A.getIndex() < B.getIndex();
});
return Result;
}
void warn(const Twine &Warning, const Twine &Context) {
errs() << Twine("while processing ") + Context + ":\n";
errs() << Twine("warning: ") + Warning + "\n";
}
bool error(const Twine &Error, const Twine &Context) {
errs() << Twine("while processing ") + Context + ":\n";
errs() << Twine("error: ") + Error + "\n";
return false;
}
bool linkDwarf(StringRef OutputFilename, const DebugMap &DM,
const LinkOptions &Options) {
DwarfLinker Linker(OutputFilename, Options);
return Linker.link(DM);
}
}
}