#include "ByteStreamer.h"
#include "DwarfDebug.h"
#include "DIE.h"
#include "DIEHash.h"
#include "DwarfUnit.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Triple.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DIBuilder.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/ValueHandle.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/MD5.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Timer.h"
#include "llvm/Target/TargetFrameLowering.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Target/TargetSubtargetInfo.h"
using namespace llvm;
#define DEBUG_TYPE "dwarfdebug"
static cl::opt<bool>
DisableDebugInfoPrinting("disable-debug-info-print", cl::Hidden,
cl::desc("Disable debug info printing"));
static cl::opt<bool> UnknownLocations(
"use-unknown-locations", cl::Hidden,
cl::desc("Make an absence of debug location information explicit."),
cl::init(false));
static cl::opt<bool>
GenerateGnuPubSections("generate-gnu-dwarf-pub-sections", cl::Hidden,
cl::desc("Generate GNU-style pubnames and pubtypes"),
cl::init(false));
static cl::opt<bool> GenerateARangeSection("generate-arange-section",
cl::Hidden,
cl::desc("Generate dwarf aranges"),
cl::init(false));
namespace {
enum DefaultOnOff { Default, Enable, Disable };
}
static cl::opt<DefaultOnOff>
DwarfAccelTables("dwarf-accel-tables", cl::Hidden,
cl::desc("Output prototype dwarf accelerator tables."),
cl::values(clEnumVal(Default, "Default for platform"),
clEnumVal(Enable, "Enabled"),
clEnumVal(Disable, "Disabled"), clEnumValEnd),
cl::init(Default));
static cl::opt<DefaultOnOff>
SplitDwarf("split-dwarf", cl::Hidden,
cl::desc("Output DWARF5 split debug info."),
cl::values(clEnumVal(Default, "Default for platform"),
clEnumVal(Enable, "Enabled"),
clEnumVal(Disable, "Disabled"), clEnumValEnd),
cl::init(Default));
static cl::opt<DefaultOnOff>
DwarfPubSections("generate-dwarf-pub-sections", cl::Hidden,
cl::desc("Generate DWARF pubnames and pubtypes sections"),
cl::values(clEnumVal(Default, "Default for platform"),
clEnumVal(Enable, "Enabled"),
clEnumVal(Disable, "Disabled"), clEnumValEnd),
cl::init(Default));
static const char *const DWARFGroupName = "DWARF Emission";
static const char *const DbgTimerName = "DWARF Debug Writer";
template <typename T> T DbgVariable::resolve(DIRef<T> Ref) const {
return DD->resolve(Ref);
}
bool DbgVariable::isBlockByrefVariable() const {
assert(Var.isVariable() && "Invalid complex DbgVariable!");
return Var.isBlockByrefVariable(DD->getTypeIdentifierMap());
}
DIType DbgVariable::getType() const {
DIType Ty = Var.getType().resolve(DD->getTypeIdentifierMap());
if (Var.isBlockByrefVariable(DD->getTypeIdentifierMap())) {
DIType subType = Ty;
uint16_t tag = Ty.getTag();
if (tag == dwarf::DW_TAG_pointer_type)
subType = resolve(DIDerivedType(Ty).getTypeDerivedFrom());
DIArray Elements = DICompositeType(subType).getElements();
for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
DIDerivedType DT(Elements.getElement(i));
if (getName() == DT.getName())
return (resolve(DT.getTypeDerivedFrom()));
}
}
return Ty;
}
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(dwarf::DW_ATOM_type_flags, dwarf::DW_FORM_data1)};
DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
: Asm(A), MMI(Asm->MMI), FirstCU(nullptr), PrevLabel(nullptr),
GlobalRangeCount(0), InfoHolder(A, "info_string", DIEValueAllocator),
UsedNonDefaultText(false),
SkeletonHolder(A, "skel_string", DIEValueAllocator),
AccelNames(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
dwarf::DW_FORM_data4)),
AccelObjC(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
dwarf::DW_FORM_data4)),
AccelNamespace(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
dwarf::DW_FORM_data4)),
AccelTypes(TypeAtoms) {
DwarfInfoSectionSym = DwarfAbbrevSectionSym = DwarfStrSectionSym = nullptr;
DwarfDebugRangeSectionSym = DwarfDebugLocSectionSym = nullptr;
DwarfLineSectionSym = nullptr;
DwarfAddrSectionSym = nullptr;
DwarfAbbrevDWOSectionSym = DwarfStrDWOSectionSym = nullptr;
FunctionBeginSym = FunctionEndSym = nullptr;
CurFn = nullptr;
CurMI = nullptr;
bool IsDarwin = Triple(A->getTargetTriple()).isOSDarwin();
if (DwarfAccelTables == Default)
HasDwarfAccelTables = IsDarwin;
else
HasDwarfAccelTables = DwarfAccelTables == Enable;
if (SplitDwarf == Default)
HasSplitDwarf = false;
else
HasSplitDwarf = SplitDwarf == Enable;
if (DwarfPubSections == Default)
HasDwarfPubSections = !IsDarwin;
else
HasDwarfPubSections = DwarfPubSections == Enable;
unsigned DwarfVersionNumber = Asm->TM.Options.MCOptions.DwarfVersion;
DwarfVersion = DwarfVersionNumber ? DwarfVersionNumber
: MMI->getModule()->getDwarfVersion();
Asm->OutStreamer.getContext().setDwarfVersion(DwarfVersion);
{
NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
beginModule();
}
}
DwarfDebug::~DwarfDebug() { }
static MCSymbol *emitSectionSym(AsmPrinter *Asm, const MCSection *Section,
const char *SymbolStem = nullptr) {
Asm->OutStreamer.SwitchSection(Section);
if (!SymbolStem)
return nullptr;
MCSymbol *TmpSym = Asm->GetTempSymbol(SymbolStem);
Asm->OutStreamer.EmitLabel(TmpSym);
return TmpSym;
}
static bool isObjCClass(StringRef Name) {
return Name.startswith("+") || Name.startswith("-");
}
static bool hasObjCCategory(StringRef Name) {
if (!isObjCClass(Name))
return false;
return Name.find(") ") != StringRef::npos;
}
static void getObjCClassCategory(StringRef In, StringRef &Class,
StringRef &Category) {
if (!hasObjCCategory(In)) {
Class = In.slice(In.find('[') + 1, In.find(' '));
Category = "";
return;
}
Class = In.slice(In.find('[') + 1, In.find('('));
Category = In.slice(In.find('[') + 1, In.find(' '));
return;
}
static StringRef getObjCMethodName(StringRef In) {
return In.slice(In.find(' ') + 1, In.find(']'));
}
static bool SectionSort(const MCSection *A, const MCSection *B) {
std::string LA = (A ? A->getLabelBeginName() : "");
std::string LB = (B ? B->getLabelBeginName() : "");
return LA < LB;
}
void DwarfDebug::addSubprogramNames(DISubprogram SP, DIE &Die) {
if (!SP.isDefinition())
return;
addAccelName(SP.getName(), Die);
if (SP.getLinkageName() != "" && SP.getName() != SP.getLinkageName())
addAccelName(SP.getLinkageName(), Die);
if (isObjCClass(SP.getName())) {
StringRef Class, Category;
getObjCClassCategory(SP.getName(), Class, Category);
addAccelObjC(Class, Die);
if (Category != "")
addAccelObjC(Category, Die);
addAccelName(getObjCMethodName(SP.getName()), Die);
}
}
bool DwarfDebug::isSubprogramContext(const MDNode *Context) {
if (!Context)
return false;
DIDescriptor D(Context);
if (D.isSubprogram())
return true;
if (D.isType())
return isSubprogramContext(resolve(DIType(Context).getContext()));
return false;
}
DIE &DwarfDebug::updateSubprogramScopeDIE(DwarfCompileUnit &SPCU,
DISubprogram SP) {
DIE *SPDie = SPCU.getOrCreateSubprogramDIE(SP);
attachLowHighPC(SPCU, *SPDie, FunctionBeginSym, FunctionEndSym);
const TargetRegisterInfo *RI = Asm->TM.getSubtargetImpl()->getRegisterInfo();
MachineLocation Location(RI->getFrameRegister(*Asm->MF));
SPCU.addAddress(*SPDie, dwarf::DW_AT_frame_base, Location);
addSubprogramNames(SP, *SPDie);
return *SPDie;
}
bool DwarfDebug::isLexicalScopeDIENull(LexicalScope *Scope) {
if (Scope->isAbstractScope())
return false;
const SmallVectorImpl<InsnRange> &Ranges = Scope->getRanges();
if (Ranges.empty())
return true;
if (Ranges.size() > 1)
return false;
SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin();
MCSymbol *End = getLabelAfterInsn(RI->second);
return !End;
}
static void addSectionLabel(AsmPrinter &Asm, DwarfUnit &U, DIE &D,
dwarf::Attribute A, const MCSymbol *L,
const MCSymbol *Sec) {
if (Asm.MAI->doesDwarfUseRelocationsAcrossSections())
U.addSectionLabel(D, A, L);
else
U.addSectionDelta(D, A, L, Sec);
}
void DwarfDebug::addScopeRangeList(DwarfCompileUnit &TheCU, DIE &ScopeDIE,
const SmallVectorImpl<InsnRange> &Range) {
MCSymbol *RangeSym = Asm->GetTempSymbol("debug_ranges", GlobalRangeCount++);
if (useSplitDwarf())
TheCU.addSectionDelta(ScopeDIE, dwarf::DW_AT_ranges, RangeSym,
DwarfDebugRangeSectionSym);
else
addSectionLabel(*Asm, TheCU, ScopeDIE, dwarf::DW_AT_ranges, RangeSym,
DwarfDebugRangeSectionSym);
RangeSpanList List(RangeSym);
for (const InsnRange &R : Range) {
RangeSpan Span(getLabelBeforeInsn(R.first), getLabelAfterInsn(R.second));
List.addRange(std::move(Span));
}
TheCU.addRangeList(std::move(List));
}
void DwarfDebug::attachRangesOrLowHighPC(DwarfCompileUnit &TheCU, DIE &Die,
const SmallVectorImpl<InsnRange> &Ranges) {
assert(!Ranges.empty());
if (Ranges.size() == 1)
attachLowHighPC(TheCU, Die, getLabelBeforeInsn(Ranges.front().first),
getLabelAfterInsn(Ranges.front().second));
else
addScopeRangeList(TheCU, Die, Ranges);
}
std::unique_ptr<DIE>
DwarfDebug::constructLexicalScopeDIE(DwarfCompileUnit &TheCU,
LexicalScope *Scope) {
if (isLexicalScopeDIENull(Scope))
return nullptr;
auto ScopeDIE = make_unique<DIE>(dwarf::DW_TAG_lexical_block);
if (Scope->isAbstractScope())
return ScopeDIE;
attachRangesOrLowHighPC(TheCU, *ScopeDIE, Scope->getRanges());
return ScopeDIE;
}
std::unique_ptr<DIE>
DwarfDebug::constructInlinedScopeDIE(DwarfCompileUnit &TheCU,
LexicalScope *Scope) {
assert(Scope->getScopeNode());
DIScope DS(Scope->getScopeNode());
DISubprogram InlinedSP = getDISubprogram(DS);
DIE *OriginDIE = AbstractSPDies[InlinedSP];
assert(OriginDIE && "Unable to find original DIE for an inlined subprogram.");
auto ScopeDIE = make_unique<DIE>(dwarf::DW_TAG_inlined_subroutine);
TheCU.addDIEEntry(*ScopeDIE, dwarf::DW_AT_abstract_origin, *OriginDIE);
attachRangesOrLowHighPC(TheCU, *ScopeDIE, Scope->getRanges());
InlinedSubprogramDIEs.insert(OriginDIE);
DILocation DL(Scope->getInlinedAt());
TheCU.addUInt(*ScopeDIE, dwarf::DW_AT_call_file, None,
TheCU.getOrCreateSourceID(DL.getFilename(), DL.getDirectory()));
TheCU.addUInt(*ScopeDIE, dwarf::DW_AT_call_line, None, DL.getLineNumber());
addSubprogramNames(InlinedSP, *ScopeDIE);
return ScopeDIE;
}
static std::unique_ptr<DIE> constructVariableDIE(DwarfCompileUnit &TheCU,
DbgVariable &DV,
const LexicalScope &Scope,
DIE *&ObjectPointer) {
auto Var = TheCU.constructVariableDIE(DV, Scope.isAbstractScope());
if (DV.isObjectPointer())
ObjectPointer = Var.get();
return Var;
}
DIE *DwarfDebug::createScopeChildrenDIE(
DwarfCompileUnit &TheCU, LexicalScope *Scope,
SmallVectorImpl<std::unique_ptr<DIE>> &Children) {
DIE *ObjectPointer = nullptr;
if (LScopes.isCurrentFunctionScope(Scope)) {
for (DbgVariable *ArgDV : CurrentFnArguments)
if (ArgDV)
Children.push_back(
constructVariableDIE(TheCU, *ArgDV, *Scope, ObjectPointer));
DISubprogram SP(Scope->getScopeNode());
DITypeArray FnArgs = SP.getType().getTypeArray();
if (FnArgs.getNumElements() > 1 &&
!FnArgs.getElement(FnArgs.getNumElements() - 1))
Children.push_back(
make_unique<DIE>(dwarf::DW_TAG_unspecified_parameters));
}
for (DbgVariable *DV : ScopeVariables.lookup(Scope))
Children.push_back(constructVariableDIE(TheCU, *DV, *Scope, ObjectPointer));
for (LexicalScope *LS : Scope->getChildren())
if (std::unique_ptr<DIE> Nested = constructScopeDIE(TheCU, LS))
Children.push_back(std::move(Nested));
return ObjectPointer;
}
void DwarfDebug::createAndAddScopeChildren(DwarfCompileUnit &TheCU,
LexicalScope *Scope, DIE &ScopeDIE) {
SmallVector<std::unique_ptr<DIE>, 8> Children;
if (DIE *ObjectPointer = createScopeChildrenDIE(TheCU, Scope, Children))
TheCU.addDIEEntry(ScopeDIE, dwarf::DW_AT_object_pointer, *ObjectPointer);
for (auto &I : Children)
ScopeDIE.addChild(std::move(I));
}
void DwarfDebug::constructAbstractSubprogramScopeDIE(DwarfCompileUnit &TheCU,
LexicalScope *Scope) {
assert(Scope && Scope->getScopeNode());
assert(Scope->isAbstractScope());
assert(!Scope->getInlinedAt());
DISubprogram SP(Scope->getScopeNode());
ProcessedSPNodes.insert(SP);
DIE *&AbsDef = AbstractSPDies[SP];
if (AbsDef)
return;
DwarfCompileUnit &SPCU = *SPMap[SP];
DIE *ContextDIE;
if (DISubprogram SPDecl = SP.getFunctionDeclaration()) {
ContextDIE = &SPCU.getUnitDie();
SPCU.getOrCreateSubprogramDIE(SPDecl);
} else
ContextDIE = SPCU.getOrCreateContextDIE(resolve(SP.getContext()));
AbsDef = &SPCU.createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE,
DIDescriptor());
SPCU.applySubprogramAttributesToDefinition(SP, *AbsDef);
SPCU.addUInt(*AbsDef, dwarf::DW_AT_inline, None, dwarf::DW_INL_inlined);
createAndAddScopeChildren(SPCU, Scope, *AbsDef);
}
DIE &DwarfDebug::constructSubprogramScopeDIE(DwarfCompileUnit &TheCU,
LexicalScope *Scope) {
assert(Scope && Scope->getScopeNode());
assert(!Scope->getInlinedAt());
assert(!Scope->isAbstractScope());
DISubprogram Sub(Scope->getScopeNode());
assert(Sub.isSubprogram());
ProcessedSPNodes.insert(Sub);
DIE &ScopeDIE = updateSubprogramScopeDIE(TheCU, Sub);
createAndAddScopeChildren(TheCU, Scope, ScopeDIE);
return ScopeDIE;
}
std::unique_ptr<DIE> DwarfDebug::constructScopeDIE(DwarfCompileUnit &TheCU,
LexicalScope *Scope) {
if (!Scope || !Scope->getScopeNode())
return nullptr;
DIScope DS(Scope->getScopeNode());
assert((Scope->getInlinedAt() || !DS.isSubprogram()) &&
"Only handle inlined subprograms here, use "
"constructSubprogramScopeDIE for non-inlined "
"subprograms");
SmallVector<std::unique_ptr<DIE>, 8> Children;
std::unique_ptr<DIE> ScopeDIE;
if (Scope->getParent() && DS.isSubprogram()) {
ScopeDIE = constructInlinedScopeDIE(TheCU, Scope);
if (!ScopeDIE)
return nullptr;
createScopeChildrenDIE(TheCU, Scope, Children);
} else {
if (isLexicalScopeDIENull(Scope))
return nullptr;
createScopeChildrenDIE(TheCU, Scope, Children);
std::pair<ImportedEntityMap::const_iterator,
ImportedEntityMap::const_iterator> Range =
std::equal_range(ScopesWithImportedEntities.begin(),
ScopesWithImportedEntities.end(),
std::pair<const MDNode *, const MDNode *>(DS, nullptr),
less_first());
if (Children.empty() && Range.first == Range.second)
return nullptr;
ScopeDIE = constructLexicalScopeDIE(TheCU, Scope);
assert(ScopeDIE && "Scope DIE should not be null.");
for (ImportedEntityMap::const_iterator i = Range.first; i != Range.second;
++i)
constructImportedEntityDIE(TheCU, i->second, *ScopeDIE);
}
for (auto &I : Children)
ScopeDIE->addChild(std::move(I));
return ScopeDIE;
}
void DwarfDebug::addGnuPubAttributes(DwarfUnit &U, DIE &D) const {
if (!GenerateGnuPubSections)
return;
U.addFlag(D, dwarf::DW_AT_GNU_pubnames);
}
DwarfCompileUnit &DwarfDebug::constructDwarfCompileUnit(DICompileUnit DIUnit) {
StringRef FN = DIUnit.getFilename();
CompilationDir = DIUnit.getDirectory();
auto OwnedUnit = make_unique<DwarfCompileUnit>(
InfoHolder.getUnits().size(), DIUnit, Asm, this, &InfoHolder);
DwarfCompileUnit &NewCU = *OwnedUnit;
DIE &Die = NewCU.getUnitDie();
InfoHolder.addUnit(std::move(OwnedUnit));
if (!Asm->OutStreamer.hasRawTextSupport() || SingleCU)
Asm->OutStreamer.getContext().setMCLineTableCompilationDir(
NewCU.getUniqueID(), CompilationDir);
NewCU.addString(Die, dwarf::DW_AT_producer, DIUnit.getProducer());
NewCU.addUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
DIUnit.getLanguage());
NewCU.addString(Die, dwarf::DW_AT_name, FN);
if (!useSplitDwarf()) {
NewCU.initStmtList(DwarfLineSectionSym);
if (!CompilationDir.empty())
NewCU.addString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
addGnuPubAttributes(NewCU, Die);
}
if (DIUnit.isOptimized())
NewCU.addFlag(Die, dwarf::DW_AT_APPLE_optimized);
StringRef Flags = DIUnit.getFlags();
if (!Flags.empty())
NewCU.addString(Die, dwarf::DW_AT_APPLE_flags, Flags);
if (unsigned RVer = DIUnit.getRunTimeVersion())
NewCU.addUInt(Die, dwarf::DW_AT_APPLE_major_runtime_vers,
dwarf::DW_FORM_data1, RVer);
if (!FirstCU)
FirstCU = &NewCU;
if (useSplitDwarf()) {
NewCU.initSection(Asm->getObjFileLowering().getDwarfInfoDWOSection(),
DwarfInfoDWOSectionSym);
NewCU.setSkeleton(constructSkeletonCU(NewCU));
} else
NewCU.initSection(Asm->getObjFileLowering().getDwarfInfoSection(),
DwarfInfoSectionSym);
CUMap.insert(std::make_pair(DIUnit, &NewCU));
CUDieMap.insert(std::make_pair(&Die, &NewCU));
return NewCU;
}
void DwarfDebug::constructImportedEntityDIE(DwarfCompileUnit &TheCU,
const MDNode *N) {
DIImportedEntity Module(N);
assert(Module.Verify());
if (DIE *D = TheCU.getOrCreateContextDIE(Module.getContext()))
constructImportedEntityDIE(TheCU, Module, *D);
}
void DwarfDebug::constructImportedEntityDIE(DwarfCompileUnit &TheCU,
const MDNode *N, DIE &Context) {
DIImportedEntity Module(N);
assert(Module.Verify());
return constructImportedEntityDIE(TheCU, Module, Context);
}
void DwarfDebug::constructImportedEntityDIE(DwarfCompileUnit &TheCU,
const DIImportedEntity &Module,
DIE &Context) {
assert(Module.Verify() &&
"Use one of the MDNode * overloads to handle invalid metadata");
DIE &IMDie = TheCU.createAndAddDIE(Module.getTag(), Context, Module);
DIE *EntityDie;
DIDescriptor Entity = resolve(Module.getEntity());
if (Entity.isNameSpace())
EntityDie = TheCU.getOrCreateNameSpace(DINameSpace(Entity));
if (Entity.isModule())
EntityDie = TheCU.getOrCreateModule(DIModule(Entity));
else if (Entity.isSubprogram())
EntityDie = TheCU.getOrCreateSubprogramDIE(DISubprogram(Entity));
else if (Entity.isType())
EntityDie = TheCU.getOrCreateTypeDIE(DIType(Entity));
else
EntityDie = TheCU.getDIE(Entity);
TheCU.addSourceLine(IMDie, Module.getLineNumber(),
Module.getContext().getFilename(),
Module.getContext().getDirectory());
TheCU.addDIEEntry(IMDie, dwarf::DW_AT_import, *EntityDie);
StringRef Name = Module.getName();
if (!Name.empty())
TheCU.addString(IMDie, dwarf::DW_AT_name, Name);
}
void DwarfDebug::beginModule() {
if (DisableDebugInfoPrinting)
return;
const Module *M = MMI->getModule();
FunctionDIs = makeSubprogramMap(*M);
NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
if (!CU_Nodes)
return;
TypeIdentifierMap = generateDITypeIdentifierMap(CU_Nodes);
emitSectionLabels();
SingleCU = CU_Nodes->getNumOperands() == 1;
for (MDNode *N : CU_Nodes->operands()) {
DICompileUnit CUNode(N);
DwarfCompileUnit &CU = constructDwarfCompileUnit(CUNode);
DIArray ImportedEntities = CUNode.getImportedEntities();
for (unsigned i = 0, e = ImportedEntities.getNumElements(); i != e; ++i)
ScopesWithImportedEntities.push_back(std::make_pair(
DIImportedEntity(ImportedEntities.getElement(i)).getContext(),
ImportedEntities.getElement(i)));
std::sort(ScopesWithImportedEntities.begin(),
ScopesWithImportedEntities.end(), less_first());
DIArray GVs = CUNode.getGlobalVariables();
for (unsigned i = 0, e = GVs.getNumElements(); i != e; ++i)
CU.createGlobalVariableDIE(DIGlobalVariable(GVs.getElement(i)));
DIArray SPs = CUNode.getSubprograms();
for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i)
SPMap.insert(std::make_pair(SPs.getElement(i), &CU));
DIArray EnumTypes = CUNode.getEnumTypes();
for (unsigned i = 0, e = EnumTypes.getNumElements(); i != e; ++i) {
DIType Ty(EnumTypes.getElement(i));
DIType UniqueTy(resolve(Ty.getRef()));
CU.getOrCreateTypeDIE(UniqueTy);
}
DIArray RetainedTypes = CUNode.getRetainedTypes();
for (unsigned i = 0, e = RetainedTypes.getNumElements(); i != e; ++i) {
DIType Ty(RetainedTypes.getElement(i));
DIType UniqueTy(resolve(Ty.getRef()));
CU.getOrCreateTypeDIE(UniqueTy);
}
for (unsigned i = 0, e = ImportedEntities.getNumElements(); i != e; ++i)
constructImportedEntityDIE(CU, ImportedEntities.getElement(i));
}
MMI->setDebugInfoAvailability(true);
SectionMap[Asm->getObjFileLowering().getTextSection()];
}
void DwarfDebug::finishVariableDefinitions() {
for (const auto &Var : ConcreteVariables) {
DIE *VariableDie = Var->getDIE();
assert(VariableDie);
DwarfCompileUnit *Unit = lookupUnit(VariableDie->getUnit());
assert(Unit);
DbgVariable *AbsVar = getExistingAbstractVariable(Var->getVariable());
if (AbsVar && AbsVar->getDIE()) {
Unit->addDIEEntry(*VariableDie, dwarf::DW_AT_abstract_origin,
*AbsVar->getDIE());
} else
Unit->applyVariableAttributes(*Var, *VariableDie);
}
}
void DwarfDebug::finishSubprogramDefinitions() {
const Module *M = MMI->getModule();
NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
for (MDNode *N : CU_Nodes->operands()) {
DICompileUnit TheCU(N);
DwarfCompileUnit *SPCU =
static_cast<DwarfCompileUnit *>(CUMap.lookup(TheCU));
DIArray Subprograms = TheCU.getSubprograms();
for (unsigned i = 0, e = Subprograms.getNumElements(); i != e; ++i) {
DISubprogram SP(Subprograms.getElement(i));
if (SPMap[SP] != SPCU)
continue;
DIE *D = SPCU->getDIE(SP);
if (DIE *AbsSPDIE = AbstractSPDies.lookup(SP)) {
if (D)
SPCU->addDIEEntry(*D, dwarf::DW_AT_abstract_origin, *AbsSPDIE);
} else {
if (!D)
D = SPCU->getOrCreateSubprogramDIE(SP);
SPCU->applySubprogramAttributesToDefinition(SP, *D);
}
}
}
}
void DwarfDebug::collectDeadVariables() {
const Module *M = MMI->getModule();
if (NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu")) {
for (MDNode *N : CU_Nodes->operands()) {
DICompileUnit TheCU(N);
DwarfCompileUnit *SPCU =
static_cast<DwarfCompileUnit *>(CUMap.lookup(TheCU));
assert(SPCU && "Unable to find Compile Unit!");
DIArray Subprograms = TheCU.getSubprograms();
for (unsigned i = 0, e = Subprograms.getNumElements(); i != e; ++i) {
DISubprogram SP(Subprograms.getElement(i));
if (ProcessedSPNodes.count(SP) != 0)
continue;
assert(SP.isSubprogram() &&
"CU's subprogram list contains a non-subprogram");
assert(SP.isDefinition() &&
"CU's subprogram list contains a subprogram declaration");
DIArray Variables = SP.getVariables();
if (Variables.getNumElements() == 0)
continue;
DIE *SPDIE = AbstractSPDies.lookup(SP);
if (!SPDIE)
SPDIE = SPCU->getDIE(SP);
assert(SPDIE);
for (unsigned vi = 0, ve = Variables.getNumElements(); vi != ve; ++vi) {
DIVariable DV(Variables.getElement(vi));
assert(DV.isVariable());
DbgVariable NewVar(DV, this);
auto VariableDie = SPCU->constructVariableDIE(NewVar);
SPCU->applyVariableAttributes(NewVar, *VariableDie);
SPDIE->addChild(std::move(VariableDie));
}
}
}
}
}
void DwarfDebug::finalizeModuleInfo() {
finishSubprogramDefinitions();
finishVariableDefinitions();
collectDeadVariables();
for (const auto &TheU : getUnits()) {
TheU->constructContainingTypeDIEs();
if (TheU->getUnitDie().getTag() == dwarf::DW_TAG_compile_unit) {
DwarfCompileUnit *SkCU =
static_cast<DwarfCompileUnit *>(TheU->getSkeleton());
if (useSplitDwarf()) {
uint64_t ID = DIEHash(Asm).computeCUSignature(TheU->getUnitDie());
TheU->addUInt(TheU->getUnitDie(), dwarf::DW_AT_GNU_dwo_id,
dwarf::DW_FORM_data8, ID);
SkCU->addUInt(SkCU->getUnitDie(), dwarf::DW_AT_GNU_dwo_id,
dwarf::DW_FORM_data8, ID);
if (!AddrPool.isEmpty())
addSectionLabel(*Asm, *SkCU, SkCU->getUnitDie(),
dwarf::DW_AT_GNU_addr_base, DwarfAddrSectionSym,
DwarfAddrSectionSym);
if (!TheU->getRangeLists().empty())
addSectionLabel(*Asm, *SkCU, SkCU->getUnitDie(),
dwarf::DW_AT_GNU_ranges_base,
DwarfDebugRangeSectionSym, DwarfDebugRangeSectionSym);
}
DwarfCompileUnit &U =
SkCU ? *SkCU : static_cast<DwarfCompileUnit &>(*TheU);
unsigned NumRanges = TheU->getRanges().size();
if (NumRanges) {
if (NumRanges > 1) {
addSectionLabel(*Asm, U, U.getUnitDie(), dwarf::DW_AT_ranges,
Asm->GetTempSymbol("cu_ranges", U.getUniqueID()),
DwarfDebugRangeSectionSym);
U.addUInt(U.getUnitDie(), dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
0);
} else {
RangeSpan &Range = TheU->getRanges().back();
attachLowHighPC(U, U.getUnitDie(), Range.getStart(), Range.getEnd());
}
}
}
}
InfoHolder.computeSizeAndOffsets();
if (useSplitDwarf())
SkeletonHolder.computeSizeAndOffsets();
}
void DwarfDebug::endSections() {
for (const SymbolCU &SCU : ArangeLabels) {
if (SCU.Sym->isInSection()) {
const MCSection *Section = &SCU.Sym->getSection();
if (!Section->getKind().isMetadata())
SectionMap[Section].push_back(SCU);
} else {
SectionMap[nullptr].push_back(SCU);
}
}
std::vector<const MCSection *> Sections;
for (const auto &it : SectionMap) {
const MCSection *Section = it.first;
Sections.push_back(Section);
}
std::sort(Sections.begin(), Sections.end(), SectionSort);
for (unsigned ID = 0, E = Sections.size(); ID != E; ID++) {
const MCSection *Section = Sections[ID];
MCSymbol *Sym = nullptr;
if (Section) {
Sym = Asm->GetTempSymbol("debug_end", ID);
Asm->OutStreamer.SwitchSection(Section);
Asm->OutStreamer.EmitLabel(Sym);
}
SectionMap[Section].push_back(SymbolCU(nullptr, Sym));
}
}
void DwarfDebug::endModule() {
assert(CurFn == nullptr);
assert(CurMI == nullptr);
if (!FirstCU)
return;
endSections();
finalizeModuleInfo();
emitDebugStr();
emitDebugInfo();
emitAbbreviations();
if (GenerateARangeSection)
emitDebugARanges();
emitDebugRanges();
if (useSplitDwarf()) {
emitDebugStrDWO();
emitDebugInfoDWO();
emitDebugAbbrevDWO();
emitDebugLineDWO();
emitDebugLocDWO();
AddrPool.emit(*Asm, Asm->getObjFileLowering().getDwarfAddrSection());
} else
emitDebugLoc();
if (useDwarfAccelTables()) {
emitAccelNames();
emitAccelObjC();
emitAccelNamespaces();
emitAccelTypes();
}
if (HasDwarfPubSections) {
emitDebugPubNames(GenerateGnuPubSections);
emitDebugPubTypes(GenerateGnuPubSections);
}
SPMap.clear();
AbstractVariables.clear();
FirstCU = nullptr;
}
DbgVariable *DwarfDebug::getExistingAbstractVariable(const DIVariable &DV,
DIVariable &Cleansed) {
LLVMContext &Ctx = DV->getContext();
Cleansed = cleanseInlinedVariable(DV, Ctx);
auto I = AbstractVariables.find(Cleansed);
if (I != AbstractVariables.end())
return I->second.get();
return nullptr;
}
DbgVariable *DwarfDebug::getExistingAbstractVariable(const DIVariable &DV) {
DIVariable Cleansed;
return getExistingAbstractVariable(DV, Cleansed);
}
void DwarfDebug::createAbstractVariable(const DIVariable &Var,
LexicalScope *Scope) {
auto AbsDbgVariable = make_unique<DbgVariable>(Var, this);
addScopeVariable(Scope, AbsDbgVariable.get());
AbstractVariables[Var] = std::move(AbsDbgVariable);
}
void DwarfDebug::ensureAbstractVariableIsCreated(const DIVariable &DV,
const MDNode *ScopeNode) {
DIVariable Cleansed = DV;
if (getExistingAbstractVariable(DV, Cleansed))
return;
createAbstractVariable(Cleansed, LScopes.getOrCreateAbstractScope(ScopeNode));
}
void
DwarfDebug::ensureAbstractVariableIsCreatedIfScoped(const DIVariable &DV,
const MDNode *ScopeNode) {
DIVariable Cleansed = DV;
if (getExistingAbstractVariable(DV, Cleansed))
return;
if (LexicalScope *Scope = LScopes.findAbstractScope(ScopeNode))
createAbstractVariable(Cleansed, Scope);
}
bool DwarfDebug::addCurrentFnArgument(DbgVariable *Var, LexicalScope *Scope) {
if (!LScopes.isCurrentFunctionScope(Scope))
return false;
DIVariable DV = Var->getVariable();
if (DV.getTag() != dwarf::DW_TAG_arg_variable)
return false;
unsigned ArgNo = DV.getArgNumber();
if (ArgNo == 0)
return false;
size_t Size = CurrentFnArguments.size();
if (Size == 0)
CurrentFnArguments.resize(CurFn->getFunction()->arg_size());
if (ArgNo > Size)
CurrentFnArguments.resize(ArgNo * 2);
assert(!CurrentFnArguments[ArgNo - 1]);
CurrentFnArguments[ArgNo - 1] = Var;
return true;
}
void DwarfDebug::collectVariableInfoFromMMITable(
SmallPtrSet<const MDNode *, 16> &Processed) {
for (const auto &VI : MMI->getVariableDbgInfo()) {
if (!VI.Var)
continue;
Processed.insert(VI.Var);
DIVariable DV(VI.Var);
LexicalScope *Scope = LScopes.findLexicalScope(VI.Loc);
if (!Scope)
continue;
ensureAbstractVariableIsCreatedIfScoped(DV, Scope->getScopeNode());
ConcreteVariables.push_back(make_unique<DbgVariable>(DV, this));
DbgVariable *RegVar = ConcreteVariables.back().get();
RegVar->setFrameIndex(VI.Slot);
addScopeVariable(Scope, RegVar);
}
}
static DebugLocEntry::Value getDebugLocValue(const MachineInstr *MI) {
const MDNode *Var = MI->getDebugVariable();
assert(MI->getNumOperands() == 3);
if (MI->getOperand(0).isReg()) {
MachineLocation MLoc;
if (!MI->getOperand(1).isImm())
MLoc.set(MI->getOperand(0).getReg());
else
MLoc.set(MI->getOperand(0).getReg(), MI->getOperand(1).getImm());
return DebugLocEntry::Value(Var, MLoc);
}
if (MI->getOperand(0).isImm())
return DebugLocEntry::Value(Var, MI->getOperand(0).getImm());
if (MI->getOperand(0).isFPImm())
return DebugLocEntry::Value(Var, MI->getOperand(0).getFPImm());
if (MI->getOperand(0).isCImm())
return DebugLocEntry::Value(Var, MI->getOperand(0).getCImm());
llvm_unreachable("Unexpected 3 operand DBG_VALUE instruction!");
}
static bool piecesOverlap(DIVariable P1, DIVariable P2) {
if (!P1.isVariablePiece() || !P2.isVariablePiece())
return true;
unsigned l1 = P1.getPieceOffset();
unsigned l2 = P2.getPieceOffset();
unsigned r1 = l1 + P1.getPieceSize();
unsigned r2 = l2 + P2.getPieceSize();
return (l1 < r2) && (l2 < r1);
}
void
DwarfDebug::buildLocationList(SmallVectorImpl<DebugLocEntry> &DebugLoc,
const DbgValueHistoryMap::InstrRanges &Ranges) {
SmallVector<DebugLocEntry::Value, 4> OpenRanges;
for (auto I = Ranges.begin(), E = Ranges.end(); I != E; ++I) {
const MachineInstr *Begin = I->first;
const MachineInstr *End = I->second;
assert(Begin->isDebugValue() && "Invalid History entry");
if (Begin->getNumOperands() > 1 &&
Begin->getOperand(0).isReg() && !Begin->getOperand(0).getReg()) {
OpenRanges.clear();
continue;
}
DIVariable DIVar = Begin->getDebugVariable();
auto Last = std::remove_if(OpenRanges.begin(), OpenRanges.end(),
[&](DebugLocEntry::Value R) {
return piecesOverlap(DIVar, R.getVariable());
});
OpenRanges.erase(Last, OpenRanges.end());
const MCSymbol *StartLabel = getLabelBeforeInsn(Begin);
assert(StartLabel && "Forgot label before DBG_VALUE starting a range!");
const MCSymbol *EndLabel;
if (End != nullptr)
EndLabel = getLabelAfterInsn(End);
else if (std::next(I) == Ranges.end())
EndLabel = FunctionEndSym;
else
EndLabel = getLabelBeforeInsn(std::next(I)->first);
assert(EndLabel && "Forgot label after instruction ending a range!");
DEBUG(dbgs() << "DotDebugLoc: " << *Begin << "\n");
auto Value = getDebugLocValue(Begin);
DebugLocEntry Loc(StartLabel, EndLabel, Value);
bool couldMerge = false;
if (DIVar.isVariablePiece()) {
OpenRanges.push_back(Value);
if (!DebugLoc.empty())
if (DebugLoc.back().MergeValues(Loc))
couldMerge = true;
}
if (!couldMerge) {
if (OpenRanges.size())
Loc.addValues(OpenRanges);
DebugLoc.push_back(std::move(Loc));
}
auto CurEntry = DebugLoc.rbegin();
auto PrevEntry = std::next(CurEntry);
if (PrevEntry != DebugLoc.rend() && PrevEntry->MergeRanges(*CurEntry))
DebugLoc.pop_back();
DEBUG(dbgs() << "Values:\n";
for (auto Value : CurEntry->getValues())
Value.getVariable()->dump();
dbgs() << "-----\n");
}
}
void
DwarfDebug::collectVariableInfo(SmallPtrSet<const MDNode *, 16> &Processed) {
LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
DwarfCompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
collectVariableInfoFromMMITable(Processed);
for (const auto &I : DbgValues) {
DIVariable DV(I.first);
if (Processed.count(DV))
continue;
const auto &Ranges = I.second;
if (Ranges.empty())
continue;
LexicalScope *Scope = nullptr;
if (MDNode *IA = DV.getInlinedAt()) {
DebugLoc DL = DebugLoc::getFromDILocation(IA);
Scope = LScopes.findInlinedScope(DebugLoc::get(
DL.getLine(), DL.getCol(), DV.getContext(), IA));
} else
Scope = LScopes.findLexicalScope(DV.getContext());
if (!Scope)
continue;
Processed.insert(getEntireVariable(DV));
const MachineInstr *MInsn = Ranges.front().first;
assert(MInsn->isDebugValue() && "History must begin with debug value");
ensureAbstractVariableIsCreatedIfScoped(DV, Scope->getScopeNode());
ConcreteVariables.push_back(make_unique<DbgVariable>(MInsn, this));
DbgVariable *RegVar = ConcreteVariables.back().get();
addScopeVariable(Scope, RegVar);
if (Ranges.size() == 1 && Ranges.front().second == nullptr)
continue;
RegVar->setDotDebugLocOffset(DotDebugLocEntries.size());
DotDebugLocEntries.resize(DotDebugLocEntries.size() + 1);
DebugLocList &LocList = DotDebugLocEntries.back();
LocList.CU = TheCU;
LocList.Label =
Asm->GetTempSymbol("debug_loc", DotDebugLocEntries.size() - 1);
buildLocationList(LocList.List, Ranges);
}
DIArray Variables = DISubprogram(FnScope->getScopeNode()).getVariables();
for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
DIVariable DV(Variables.getElement(i));
assert(DV.isVariable());
if (!Processed.insert(DV))
continue;
if (LexicalScope *Scope = LScopes.findLexicalScope(DV.getContext())) {
ensureAbstractVariableIsCreatedIfScoped(DV, Scope->getScopeNode());
ConcreteVariables.push_back(make_unique<DbgVariable>(DV, this));
addScopeVariable(Scope, ConcreteVariables.back().get());
}
}
}
MCSymbol *DwarfDebug::getLabelBeforeInsn(const MachineInstr *MI) {
MCSymbol *Label = LabelsBeforeInsn.lookup(MI);
assert(Label && "Didn't insert label before instruction");
return Label;
}
MCSymbol *DwarfDebug::getLabelAfterInsn(const MachineInstr *MI) {
return LabelsAfterInsn.lookup(MI);
}
void DwarfDebug::beginInstruction(const MachineInstr *MI) {
assert(CurMI == nullptr);
CurMI = MI;
if (!MI->isDebugValue()) {
DebugLoc DL = MI->getDebugLoc();
if (DL != PrevInstLoc && (!DL.isUnknown() || UnknownLocations)) {
unsigned Flags = 0;
PrevInstLoc = DL;
if (DL == PrologEndLoc) {
Flags |= DWARF2_FLAG_PROLOGUE_END;
PrologEndLoc = DebugLoc();
}
if (PrologEndLoc.isUnknown())
Flags |= DWARF2_FLAG_IS_STMT;
if (!DL.isUnknown()) {
const MDNode *Scope = DL.getScope(Asm->MF->getFunction()->getContext());
recordSourceLine(DL.getLine(), DL.getCol(), Scope, Flags);
} else
recordSourceLine(0, 0, nullptr, 0);
}
}
DenseMap<const MachineInstr *, MCSymbol *>::iterator I =
LabelsBeforeInsn.find(MI);
if (I == LabelsBeforeInsn.end())
return;
if (I->second)
return;
if (!PrevLabel) {
PrevLabel = MMI->getContext().CreateTempSymbol();
Asm->OutStreamer.EmitLabel(PrevLabel);
}
I->second = PrevLabel;
}
void DwarfDebug::endInstruction() {
assert(CurMI != nullptr);
if (!CurMI->isDebugValue())
PrevLabel = nullptr;
DenseMap<const MachineInstr *, MCSymbol *>::iterator I =
LabelsAfterInsn.find(CurMI);
CurMI = nullptr;
if (I == LabelsAfterInsn.end())
return;
if (I->second)
return;
if (!PrevLabel) {
PrevLabel = MMI->getContext().CreateTempSymbol();
Asm->OutStreamer.EmitLabel(PrevLabel);
}
I->second = PrevLabel;
}
void DwarfDebug::identifyScopeMarkers() {
SmallVector<LexicalScope *, 4> WorkList;
WorkList.push_back(LScopes.getCurrentFunctionScope());
while (!WorkList.empty()) {
LexicalScope *S = WorkList.pop_back_val();
const SmallVectorImpl<LexicalScope *> &Children = S->getChildren();
if (!Children.empty())
WorkList.append(Children.begin(), Children.end());
if (S->isAbstractScope())
continue;
for (const InsnRange &R : S->getRanges()) {
assert(R.first && "InsnRange does not have first instruction!");
assert(R.second && "InsnRange does not have second instruction!");
requestLabelBeforeInsn(R.first);
requestLabelAfterInsn(R.second);
}
}
}
static DebugLoc findPrologueEndLoc(const MachineFunction *MF) {
for (const auto &MBB : *MF)
for (const auto &MI : MBB)
if (!MI.isDebugValue() && !MI.getFlag(MachineInstr::FrameSetup) &&
!MI.getDebugLoc().isUnknown()) {
assert(!MI.isCFIInstruction() &&
"First non-frame-setup instruction is a CFI instruction.");
return MI.getDebugLoc();
}
return DebugLoc();
}
void DwarfDebug::beginFunction(const MachineFunction *MF) {
CurFn = MF;
if (!MMI->hasDebugInfo())
return;
auto DI = FunctionDIs.find(MF->getFunction());
if (DI == FunctionDIs.end())
return;
LScopes.initialize(*MF);
if (LScopes.empty())
return;
assert(DbgValues.empty() && "DbgValues map wasn't cleaned!");
identifyScopeMarkers();
LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
DwarfCompileUnit *TheCU = SPMap.lookup(FnScope->getScopeNode());
assert(TheCU && "Unable to find compile unit!");
if (Asm->OutStreamer.hasRawTextSupport())
Asm->OutStreamer.getContext().setDwarfCompileUnitID(0);
else
Asm->OutStreamer.getContext().setDwarfCompileUnitID(TheCU->getUniqueID());
FunctionBeginSym = Asm->GetTempSymbol("func_begin", Asm->getFunctionNumber());
Asm->OutStreamer.EmitLabel(FunctionBeginSym);
calculateDbgValueHistory(MF, Asm->TM.getSubtargetImpl()->getRegisterInfo(),
DbgValues);
for (const auto &I : DbgValues) {
const auto &Ranges = I.second;
if (Ranges.empty())
continue;
DIVariable DV(Ranges.front().first->getDebugVariable());
if (DV.isVariable() && DV.getTag() == dwarf::DW_TAG_arg_variable &&
getDISubprogram(DV.getContext()).describes(MF->getFunction())) {
if (!DV.isVariablePiece())
LabelsBeforeInsn[Ranges.front().first] = FunctionBeginSym;
else {
for (auto I = Ranges.begin(); I != Ranges.end(); ++I) {
DIVariable Piece = I->first->getDebugVariable();
if (std::all_of(Ranges.begin(), I,
[&](DbgValueHistoryMap::InstrRange Pred){
return !piecesOverlap(Piece, Pred.first->getDebugVariable());
}))
LabelsBeforeInsn[I->first] = FunctionBeginSym;
else
break;
}
}
}
for (const auto &Range : Ranges) {
requestLabelBeforeInsn(Range.first);
if (Range.second)
requestLabelAfterInsn(Range.second);
}
}
PrevInstLoc = DebugLoc();
PrevLabel = FunctionBeginSym;
PrologEndLoc = findPrologueEndLoc(MF);
if (!PrologEndLoc.isUnknown()) {
DebugLoc FnStartDL =
PrologEndLoc.getFnDebugLoc(MF->getFunction()->getContext());
recordSourceLine(
FnStartDL.getLine(), FnStartDL.getCol(),
FnStartDL.getScope(MF->getFunction()->getContext()),
DWARF2_FLAG_IS_STMT);
}
}
void DwarfDebug::addScopeVariable(LexicalScope *LS, DbgVariable *Var) {
if (addCurrentFnArgument(Var, LS))
return;
SmallVectorImpl<DbgVariable *> &Vars = ScopeVariables[LS];
DIVariable DV = Var->getVariable();
if (unsigned ArgNum = DV.getArgNumber()) {
SmallVectorImpl<DbgVariable *>::iterator I = Vars.begin();
while (I != Vars.end()) {
unsigned CurNum = (*I)->getVariable().getArgNumber();
if (CurNum == 0)
break;
if (CurNum > ArgNum)
break;
++I;
}
Vars.insert(I, Var);
return;
}
Vars.push_back(Var);
}
void DwarfDebug::endFunction(const MachineFunction *MF) {
if (!CurFn)
CurFn = MF;
else
assert(CurFn == MF);
assert(CurFn != nullptr);
if (!MMI->hasDebugInfo() || LScopes.empty() ||
!FunctionDIs.count(MF->getFunction())) {
PrevSection = nullptr;
PrevCU = nullptr;
CurFn = nullptr;
return;
}
FunctionEndSym = Asm->GetTempSymbol("func_end", Asm->getFunctionNumber());
Asm->OutStreamer.EmitLabel(FunctionEndSym);
Asm->OutStreamer.getContext().setDwarfCompileUnitID(0);
SmallPtrSet<const MDNode *, 16> ProcessedVars;
collectVariableInfo(ProcessedVars);
LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
DwarfCompileUnit &TheCU = *SPMap.lookup(FnScope->getScopeNode());
for (LexicalScope *AScope : LScopes.getAbstractScopesList()) {
DISubprogram SP(AScope->getScopeNode());
assert(SP.isSubprogram());
DIArray Variables = SP.getVariables();
for (unsigned i = 0, e = Variables.getNumElements(); i != e; ++i) {
DIVariable DV(Variables.getElement(i));
assert(DV && DV.isVariable());
if (!ProcessedVars.insert(DV))
continue;
ensureAbstractVariableIsCreated(DV, DV.getContext());
}
constructAbstractSubprogramScopeDIE(TheCU, AScope);
}
DIE &CurFnDIE = constructSubprogramScopeDIE(TheCU, FnScope);
if (!CurFn->getTarget().Options.DisableFramePointerElim(*CurFn))
TheCU.addFlag(CurFnDIE, dwarf::DW_AT_APPLE_omit_frame_ptr);
RangeSpan Span(FunctionBeginSym, FunctionEndSym);
TheCU.addRange(std::move(Span));
PrevSection = Asm->getCurrentSection();
PrevCU = &TheCU;
ScopeVariables.clear();
CurrentFnArguments.clear();
DbgValues.clear();
LabelsBeforeInsn.clear();
LabelsAfterInsn.clear();
PrevLabel = nullptr;
CurFn = nullptr;
}
void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S,
unsigned Flags) {
StringRef Fn;
StringRef Dir;
unsigned Src = 1;
unsigned Discriminator = 0;
if (DIScope Scope = DIScope(S)) {
assert(Scope.isScope());
Fn = Scope.getFilename();
Dir = Scope.getDirectory();
if (Scope.isLexicalBlockFile())
Discriminator = DILexicalBlockFile(S).getDiscriminator();
unsigned CUID = Asm->OutStreamer.getContext().getDwarfCompileUnitID();
Src = static_cast<DwarfCompileUnit &>(*InfoHolder.getUnits()[CUID])
.getOrCreateSourceID(Fn, Dir);
}
Asm->OutStreamer.EmitDwarfLocDirective(Src, Line, Col, Flags, 0,
Discriminator, Fn);
}
void DwarfDebug::emitSectionLabels() {
const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
DwarfInfoSectionSym =
emitSectionSym(Asm, TLOF.getDwarfInfoSection(), "section_info");
if (useSplitDwarf()) {
DwarfInfoDWOSectionSym =
emitSectionSym(Asm, TLOF.getDwarfInfoDWOSection(), "section_info_dwo");
DwarfTypesDWOSectionSym =
emitSectionSym(Asm, TLOF.getDwarfTypesDWOSection(), "section_types_dwo");
}
DwarfAbbrevSectionSym =
emitSectionSym(Asm, TLOF.getDwarfAbbrevSection(), "section_abbrev");
if (useSplitDwarf())
DwarfAbbrevDWOSectionSym = emitSectionSym(
Asm, TLOF.getDwarfAbbrevDWOSection(), "section_abbrev_dwo");
if (GenerateARangeSection)
emitSectionSym(Asm, TLOF.getDwarfARangesSection());
DwarfLineSectionSym =
emitSectionSym(Asm, TLOF.getDwarfLineSection(), "section_line");
if (GenerateGnuPubSections) {
DwarfGnuPubNamesSectionSym =
emitSectionSym(Asm, TLOF.getDwarfGnuPubNamesSection());
DwarfGnuPubTypesSectionSym =
emitSectionSym(Asm, TLOF.getDwarfGnuPubTypesSection());
} else if (HasDwarfPubSections) {
emitSectionSym(Asm, TLOF.getDwarfPubNamesSection());
emitSectionSym(Asm, TLOF.getDwarfPubTypesSection());
}
DwarfStrSectionSym =
emitSectionSym(Asm, TLOF.getDwarfStrSection(), "info_string");
if (useSplitDwarf()) {
DwarfStrDWOSectionSym =
emitSectionSym(Asm, TLOF.getDwarfStrDWOSection(), "skel_string");
DwarfAddrSectionSym =
emitSectionSym(Asm, TLOF.getDwarfAddrSection(), "addr_sec");
DwarfDebugLocSectionSym =
emitSectionSym(Asm, TLOF.getDwarfLocDWOSection(), "skel_loc");
} else
DwarfDebugLocSectionSym =
emitSectionSym(Asm, TLOF.getDwarfLocSection(), "section_debug_loc");
DwarfDebugRangeSectionSym =
emitSectionSym(Asm, TLOF.getDwarfRangesSection(), "debug_range");
}
void DwarfDebug::emitDIE(DIE &Die) {
const DIEAbbrev &Abbrev = Die.getAbbrev();
if (Asm->isVerbose())
Asm->OutStreamer.AddComment("Abbrev [" + Twine(Abbrev.getNumber()) +
"] 0x" + Twine::utohexstr(Die.getOffset()) +
":0x" + Twine::utohexstr(Die.getSize()) + " " +
dwarf::TagString(Abbrev.getTag()));
Asm->EmitULEB128(Abbrev.getNumber());
const SmallVectorImpl<DIEValue *> &Values = Die.getValues();
const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
for (unsigned i = 0, N = Values.size(); i < N; ++i) {
dwarf::Attribute Attr = AbbrevData[i].getAttribute();
dwarf::Form Form = AbbrevData[i].getForm();
assert(Form && "Too many attributes for DIE (check abbreviation)");
if (Asm->isVerbose()) {
Asm->OutStreamer.AddComment(dwarf::AttributeString(Attr));
if (Attr == dwarf::DW_AT_accessibility)
Asm->OutStreamer.AddComment(dwarf::AccessibilityString(
cast<DIEInteger>(Values[i])->getValue()));
}
Values[i]->EmitValue(Asm, Form);
}
if (Abbrev.hasChildren()) {
for (auto &Child : Die.getChildren())
emitDIE(*Child);
Asm->OutStreamer.AddComment("End Of Children Mark");
Asm->EmitInt8(0);
}
}
void DwarfDebug::emitDebugInfo() {
DwarfFile &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
Holder.emitUnits(this, DwarfAbbrevSectionSym);
}
void DwarfDebug::emitAbbreviations() {
DwarfFile &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
Holder.emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevSection());
}
void DwarfDebug::emitEndOfLineMatrix(unsigned SectionEnd) {
Asm->OutStreamer.AddComment("Extended Op");
Asm->EmitInt8(0);
Asm->OutStreamer.AddComment("Op size");
Asm->EmitInt8(Asm->getDataLayout().getPointerSize() + 1);
Asm->OutStreamer.AddComment("DW_LNE_set_address");
Asm->EmitInt8(dwarf::DW_LNE_set_address);
Asm->OutStreamer.AddComment("Section end label");
Asm->OutStreamer.EmitSymbolValue(
Asm->GetTempSymbol("section_end", SectionEnd),
Asm->getDataLayout().getPointerSize());
Asm->OutStreamer.AddComment("DW_LNE_end_sequence");
Asm->EmitInt8(0);
Asm->EmitInt8(1);
Asm->EmitInt8(1);
}
void DwarfDebug::emitAccelNames() {
AccelNames.FinalizeTable(Asm, "Names");
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().getDwarfAccelNamesSection());
MCSymbol *SectionBegin = Asm->GetTempSymbol("names_begin");
Asm->OutStreamer.EmitLabel(SectionBegin);
AccelNames.Emit(Asm, SectionBegin, &InfoHolder);
}
void DwarfDebug::emitAccelObjC() {
AccelObjC.FinalizeTable(Asm, "ObjC");
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().getDwarfAccelObjCSection());
MCSymbol *SectionBegin = Asm->GetTempSymbol("objc_begin");
Asm->OutStreamer.EmitLabel(SectionBegin);
AccelObjC.Emit(Asm, SectionBegin, &InfoHolder);
}
void DwarfDebug::emitAccelNamespaces() {
AccelNamespace.FinalizeTable(Asm, "namespac");
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().getDwarfAccelNamespaceSection());
MCSymbol *SectionBegin = Asm->GetTempSymbol("namespac_begin");
Asm->OutStreamer.EmitLabel(SectionBegin);
AccelNamespace.Emit(Asm, SectionBegin, &InfoHolder);
}
void DwarfDebug::emitAccelTypes() {
AccelTypes.FinalizeTable(Asm, "types");
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().getDwarfAccelTypesSection());
MCSymbol *SectionBegin = Asm->GetTempSymbol("types_begin");
Asm->OutStreamer.EmitLabel(SectionBegin);
AccelTypes.Emit(Asm, SectionBegin, &InfoHolder);
}
static dwarf::PubIndexEntryDescriptor computeIndexValue(DwarfUnit *CU,
const DIE *Die) {
dwarf::GDBIndexEntryLinkage Linkage = dwarf::GIEL_STATIC;
DIEValue *SpecVal = Die->findAttribute(dwarf::DW_AT_specification);
if (SpecVal) {
DIE &SpecDIE = cast<DIEEntry>(SpecVal)->getEntry();
if (SpecDIE.findAttribute(dwarf::DW_AT_external))
Linkage = dwarf::GIEL_EXTERNAL;
} else if (Die->findAttribute(dwarf::DW_AT_external))
Linkage = dwarf::GIEL_EXTERNAL;
switch (Die->getTag()) {
case dwarf::DW_TAG_class_type:
case dwarf::DW_TAG_structure_type:
case dwarf::DW_TAG_union_type:
case dwarf::DW_TAG_enumeration_type:
return dwarf::PubIndexEntryDescriptor(
dwarf::GIEK_TYPE, CU->getLanguage() != dwarf::DW_LANG_C_plus_plus
? dwarf::GIEL_STATIC
: dwarf::GIEL_EXTERNAL);
case dwarf::DW_TAG_typedef:
case dwarf::DW_TAG_base_type:
case dwarf::DW_TAG_subrange_type:
return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_TYPE, dwarf::GIEL_STATIC);
case dwarf::DW_TAG_namespace:
return dwarf::GIEK_TYPE;
case dwarf::DW_TAG_subprogram:
return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_FUNCTION, Linkage);
case dwarf::DW_TAG_constant:
case dwarf::DW_TAG_variable:
return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_VARIABLE, Linkage);
case dwarf::DW_TAG_enumerator:
return dwarf::PubIndexEntryDescriptor(dwarf::GIEK_VARIABLE,
dwarf::GIEL_STATIC);
default:
return dwarf::GIEK_NONE;
}
}
void DwarfDebug::emitDebugPubNames(bool GnuStyle) {
const MCSection *PSec =
GnuStyle ? Asm->getObjFileLowering().getDwarfGnuPubNamesSection()
: Asm->getObjFileLowering().getDwarfPubNamesSection();
emitDebugPubSection(GnuStyle, PSec, "Names", &DwarfUnit::getGlobalNames);
}
void DwarfDebug::emitDebugPubSection(
bool GnuStyle, const MCSection *PSec, StringRef Name,
const StringMap<const DIE *> &(DwarfUnit::*Accessor)() const) {
for (const auto &NU : CUMap) {
DwarfCompileUnit *TheU = NU.second;
const auto &Globals = (TheU->*Accessor)();
if (Globals.empty())
continue;
if (auto Skeleton = static_cast<DwarfCompileUnit *>(TheU->getSkeleton()))
TheU = Skeleton;
unsigned ID = TheU->getUniqueID();
Asm->OutStreamer.SwitchSection(PSec);
Asm->OutStreamer.AddComment("Length of Public " + Name + " Info");
MCSymbol *BeginLabel = Asm->GetTempSymbol("pub" + Name + "_begin", ID);
MCSymbol *EndLabel = Asm->GetTempSymbol("pub" + Name + "_end", ID);
Asm->EmitLabelDifference(EndLabel, BeginLabel, 4);
Asm->OutStreamer.EmitLabel(BeginLabel);
Asm->OutStreamer.AddComment("DWARF Version");
Asm->EmitInt16(dwarf::DW_PUBNAMES_VERSION);
Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
Asm->EmitSectionOffset(TheU->getLabelBegin(), TheU->getSectionSym());
Asm->OutStreamer.AddComment("Compilation Unit Length");
Asm->EmitLabelDifference(TheU->getLabelEnd(), TheU->getLabelBegin(), 4);
for (const auto &GI : Globals) {
const char *Name = GI.getKeyData();
const DIE *Entity = GI.second;
Asm->OutStreamer.AddComment("DIE offset");
Asm->EmitInt32(Entity->getOffset());
if (GnuStyle) {
dwarf::PubIndexEntryDescriptor Desc = computeIndexValue(TheU, Entity);
Asm->OutStreamer.AddComment(
Twine("Kind: ") + dwarf::GDBIndexEntryKindString(Desc.Kind) + ", " +
dwarf::GDBIndexEntryLinkageString(Desc.Linkage));
Asm->EmitInt8(Desc.toBits());
}
Asm->OutStreamer.AddComment("External Name");
Asm->OutStreamer.EmitBytes(StringRef(Name, GI.getKeyLength() + 1));
}
Asm->OutStreamer.AddComment("End Mark");
Asm->EmitInt32(0);
Asm->OutStreamer.EmitLabel(EndLabel);
}
}
void DwarfDebug::emitDebugPubTypes(bool GnuStyle) {
const MCSection *PSec =
GnuStyle ? Asm->getObjFileLowering().getDwarfGnuPubTypesSection()
: Asm->getObjFileLowering().getDwarfPubTypesSection();
emitDebugPubSection(GnuStyle, PSec, "Types", &DwarfUnit::getGlobalTypes);
}
void DwarfDebug::emitDebugStr() {
DwarfFile &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
Holder.emitStrings(Asm->getObjFileLowering().getDwarfStrSection());
}
void DwarfDebug::emitLocPieces(ByteStreamer &Streamer,
const DITypeIdentifierMap &Map,
ArrayRef<DebugLocEntry::Value> Values) {
assert(std::all_of(Values.begin(), Values.end(), [](DebugLocEntry::Value P) {
return P.isVariablePiece();
}) && "all values are expected to be pieces");
assert(std::is_sorted(Values.begin(), Values.end()) &&
"pieces are expected to be sorted");
unsigned Offset = 0;
for (auto Piece : Values) {
DIVariable Var = Piece.getVariable();
unsigned PieceOffset = Var.getPieceOffset();
unsigned PieceSize = Var.getPieceSize();
assert(Offset <= PieceOffset && "overlapping or duplicate pieces");
if (Offset < PieceOffset) {
Asm->EmitDwarfOpPiece(Streamer, (PieceOffset-Offset)*8);
Offset += PieceOffset-Offset;
}
Offset += PieceSize;
const unsigned SizeOfByte = 8;
assert(!Var.isIndirect() && "indirect address for piece");
#ifndef NDEBUG
unsigned VarSize = Var.getSizeInBits(Map);
assert(PieceSize+PieceOffset <= VarSize/SizeOfByte
&& "piece is larger than or outside of variable");
assert(PieceSize*SizeOfByte != VarSize
&& "piece covers entire variable");
#endif
if (Piece.isLocation() && Piece.getLoc().isReg())
Asm->EmitDwarfRegOpPiece(Streamer,
Piece.getLoc(),
PieceSize*SizeOfByte);
else {
emitDebugLocValue(Streamer, Piece);
Asm->EmitDwarfOpPiece(Streamer, PieceSize*SizeOfByte);
}
}
}
void DwarfDebug::emitDebugLocEntry(ByteStreamer &Streamer,
const DebugLocEntry &Entry) {
const DebugLocEntry::Value Value = Entry.getValues()[0];
if (Value.isVariablePiece())
return emitLocPieces(Streamer, TypeIdentifierMap, Entry.getValues());
assert(Entry.getValues().size() == 1 && "only pieces may have >1 value");
emitDebugLocValue(Streamer, Value);
}
void DwarfDebug::emitDebugLocValue(ByteStreamer &Streamer,
const DebugLocEntry::Value &Value) {
DIVariable DV = Value.getVariable();
if (Value.isInt()) {
DIBasicType BTy(resolve(DV.getType()));
if (BTy.Verify() && (BTy.getEncoding() == dwarf::DW_ATE_signed ||
BTy.getEncoding() == dwarf::DW_ATE_signed_char)) {
Streamer.EmitInt8(dwarf::DW_OP_consts, "DW_OP_consts");
Streamer.EmitSLEB128(Value.getInt());
} else {
Streamer.EmitInt8(dwarf::DW_OP_constu, "DW_OP_constu");
Streamer.EmitULEB128(Value.getInt());
}
} else if (Value.isLocation()) {
MachineLocation Loc = Value.getLoc();
if (!DV.hasComplexAddress())
Asm->EmitDwarfRegOp(Streamer, Loc, DV.isIndirect());
else {
unsigned N = DV.getNumAddrElements();
unsigned i = 0;
if (N >= 2 && DV.getAddrElement(0) == DIBuilder::OpPlus) {
if (Loc.getOffset()) {
i = 2;
Asm->EmitDwarfRegOp(Streamer, Loc, DV.isIndirect());
Streamer.EmitInt8(dwarf::DW_OP_deref, "DW_OP_deref");
Streamer.EmitInt8(dwarf::DW_OP_plus_uconst, "DW_OP_plus_uconst");
Streamer.EmitSLEB128(DV.getAddrElement(1));
} else {
MachineLocation TLoc(Loc.getReg(), DV.getAddrElement(1));
Asm->EmitDwarfRegOp(Streamer, TLoc, DV.isIndirect());
i = 2;
}
} else {
Asm->EmitDwarfRegOp(Streamer, Loc, DV.isIndirect());
}
for (; i < N; ++i) {
uint64_t Element = DV.getAddrElement(i);
if (Element == DIBuilder::OpPlus) {
Streamer.EmitInt8(dwarf::DW_OP_plus_uconst, "DW_OP_plus_uconst");
Streamer.EmitULEB128(DV.getAddrElement(++i));
} else if (Element == DIBuilder::OpDeref) {
if (!Loc.isReg())
Streamer.EmitInt8(dwarf::DW_OP_deref, "DW_OP_deref");
} else if (Element == DIBuilder::OpPiece) {
i += 3;
} else
llvm_unreachable("unknown Opcode found in complex address");
}
}
}
}
void DwarfDebug::emitDebugLocEntryLocation(const DebugLocEntry &Entry) {
Asm->OutStreamer.AddComment("Loc expr size");
MCSymbol *begin = Asm->OutStreamer.getContext().CreateTempSymbol();
MCSymbol *end = Asm->OutStreamer.getContext().CreateTempSymbol();
Asm->EmitLabelDifference(end, begin, 2);
Asm->OutStreamer.EmitLabel(begin);
APByteStreamer Streamer(*Asm);
emitDebugLocEntry(Streamer, Entry);
Asm->OutStreamer.EmitLabel(end);
}
void DwarfDebug::emitDebugLoc() {
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().getDwarfLocSection());
unsigned char Size = Asm->getDataLayout().getPointerSize();
for (const auto &DebugLoc : DotDebugLocEntries) {
Asm->OutStreamer.EmitLabel(DebugLoc.Label);
const DwarfCompileUnit *CU = DebugLoc.CU;
for (const auto &Entry : DebugLoc.List) {
if (CU->getRanges().size() == 1) {
const MCSymbol *Base = CU->getRanges()[0].getStart();
Asm->EmitLabelDifference(Entry.getBeginSym(), Base, Size);
Asm->EmitLabelDifference(Entry.getEndSym(), Base, Size);
} else {
Asm->OutStreamer.EmitSymbolValue(Entry.getBeginSym(), Size);
Asm->OutStreamer.EmitSymbolValue(Entry.getEndSym(), Size);
}
emitDebugLocEntryLocation(Entry);
}
Asm->OutStreamer.EmitIntValue(0, Size);
Asm->OutStreamer.EmitIntValue(0, Size);
}
}
void DwarfDebug::emitDebugLocDWO() {
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().getDwarfLocDWOSection());
for (const auto &DebugLoc : DotDebugLocEntries) {
Asm->OutStreamer.EmitLabel(DebugLoc.Label);
for (const auto &Entry : DebugLoc.List) {
Asm->EmitInt8(dwarf::DW_LLE_start_length_entry);
unsigned idx = AddrPool.getIndex(Entry.getBeginSym());
Asm->EmitULEB128(idx);
Asm->EmitLabelDifference(Entry.getEndSym(), Entry.getBeginSym(), 4);
emitDebugLocEntryLocation(Entry);
}
Asm->EmitInt8(dwarf::DW_LLE_end_of_list_entry);
}
}
struct ArangeSpan {
const MCSymbol *Start, *End;
};
void DwarfDebug::emitDebugARanges() {
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().getDwarfARangesSection());
typedef DenseMap<DwarfCompileUnit *, std::vector<ArangeSpan>> SpansType;
SpansType Spans;
std::vector<const MCSection *> Sections;
for (const auto &it : SectionMap) {
const MCSection *Section = it.first;
Sections.push_back(Section);
}
std::sort(Sections.begin(), Sections.end(), SectionSort);
for (const MCSection *Section : Sections) {
SmallVector<SymbolCU, 8> &List = SectionMap[Section];
if (List.size() < 2)
continue;
std::sort(List.begin(), List.end(),
[&](const SymbolCU &A, const SymbolCU &B) {
unsigned IA = A.Sym ? Asm->OutStreamer.GetSymbolOrder(A.Sym) : 0;
unsigned IB = B.Sym ? Asm->OutStreamer.GetSymbolOrder(B.Sym) : 0;
if (IA == 0)
return false;
if (IB == 0)
return true;
return IA < IB;
});
if (!Section) {
for (const SymbolCU &Cur : List) {
ArangeSpan Span;
Span.Start = Cur.Sym;
Span.End = nullptr;
if (Cur.CU)
Spans[Cur.CU].push_back(Span);
}
} else {
const MCSymbol *StartSym = List[0].Sym;
for (size_t n = 1, e = List.size(); n < e; n++) {
const SymbolCU &Prev = List[n - 1];
const SymbolCU &Cur = List[n];
if (Cur.CU != Prev.CU) {
ArangeSpan Span;
Span.Start = StartSym;
Span.End = Cur.Sym;
Spans[Prev.CU].push_back(Span);
StartSym = Cur.Sym;
}
}
}
}
unsigned PtrSize = Asm->getDataLayout().getPointerSize();
std::vector<DwarfCompileUnit *> CUs;
for (const auto &it : Spans) {
DwarfCompileUnit *CU = it.first;
CUs.push_back(CU);
}
std::sort(CUs.begin(), CUs.end(), [](const DwarfUnit *A, const DwarfUnit *B) {
return A->getUniqueID() < B->getUniqueID();
});
for (DwarfCompileUnit *CU : CUs) {
std::vector<ArangeSpan> &List = Spans[CU];
unsigned ContentSize =
sizeof(int16_t) + sizeof(int32_t) + sizeof(int8_t) + sizeof(int8_t);
unsigned TupleSize = PtrSize * 2;
unsigned Padding =
OffsetToAlignment(sizeof(int32_t) + ContentSize, TupleSize);
ContentSize += Padding;
ContentSize += (List.size() + 1) * TupleSize;
Asm->OutStreamer.AddComment("Length of ARange Set");
Asm->EmitInt32(ContentSize);
Asm->OutStreamer.AddComment("DWARF Arange version number");
Asm->EmitInt16(dwarf::DW_ARANGES_VERSION);
Asm->OutStreamer.AddComment("Offset Into Debug Info Section");
Asm->EmitSectionOffset(CU->getLocalLabelBegin(), CU->getLocalSectionSym());
Asm->OutStreamer.AddComment("Address Size (in bytes)");
Asm->EmitInt8(PtrSize);
Asm->OutStreamer.AddComment("Segment Size (in bytes)");
Asm->EmitInt8(0);
Asm->OutStreamer.EmitFill(Padding, 0xff);
for (const ArangeSpan &Span : List) {
Asm->EmitLabelReference(Span.Start, PtrSize);
if (Span.End) {
Asm->EmitLabelDifference(Span.End, Span.Start, PtrSize);
} else {
uint64_t Size = SymSize[Span.Start];
if (Size == 0)
Size = 1;
Asm->OutStreamer.EmitIntValue(Size, PtrSize);
}
}
Asm->OutStreamer.AddComment("ARange terminator");
Asm->OutStreamer.EmitIntValue(0, PtrSize);
Asm->OutStreamer.EmitIntValue(0, PtrSize);
}
}
void DwarfDebug::emitDebugRanges() {
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().getDwarfRangesSection());
unsigned char Size = Asm->getDataLayout().getPointerSize();
for (const auto &I : CUMap) {
DwarfCompileUnit *TheCU = I.second;
for (const RangeSpanList &List : TheCU->getRangeLists()) {
Asm->OutStreamer.EmitLabel(List.getSym());
for (const RangeSpan &Range : List.getRanges()) {
const MCSymbol *Begin = Range.getStart();
const MCSymbol *End = Range.getEnd();
assert(Begin && "Range without a begin symbol?");
assert(End && "Range without an end symbol?");
if (TheCU->getRanges().size() == 1) {
const MCSymbol *Base = TheCU->getRanges()[0].getStart();
Asm->EmitLabelDifference(Begin, Base, Size);
Asm->EmitLabelDifference(End, Base, Size);
} else {
Asm->OutStreamer.EmitSymbolValue(Begin, Size);
Asm->OutStreamer.EmitSymbolValue(End, Size);
}
}
Asm->OutStreamer.EmitIntValue(0, Size);
Asm->OutStreamer.EmitIntValue(0, Size);
}
if (TheCU->getRanges().size() > 1) {
Asm->OutStreamer.EmitLabel(
Asm->GetTempSymbol("cu_ranges", TheCU->getUniqueID()));
for (const RangeSpan &Range : TheCU->getRanges()) {
const MCSymbol *Begin = Range.getStart();
const MCSymbol *End = Range.getEnd();
assert(Begin && "Range without a begin symbol?");
assert(End && "Range without an end symbol?");
Asm->OutStreamer.EmitSymbolValue(Begin, Size);
Asm->OutStreamer.EmitSymbolValue(End, Size);
}
Asm->OutStreamer.EmitIntValue(0, Size);
Asm->OutStreamer.EmitIntValue(0, Size);
}
}
}
void DwarfDebug::initSkeletonUnit(const DwarfUnit &U, DIE &Die,
std::unique_ptr<DwarfUnit> NewU) {
NewU->addLocalString(Die, dwarf::DW_AT_GNU_dwo_name,
U.getCUNode().getSplitDebugFilename());
if (!CompilationDir.empty())
NewU->addLocalString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
addGnuPubAttributes(*NewU, Die);
SkeletonHolder.addUnit(std::move(NewU));
}
DwarfCompileUnit &DwarfDebug::constructSkeletonCU(const DwarfCompileUnit &CU) {
auto OwnedUnit = make_unique<DwarfCompileUnit>(
CU.getUniqueID(), CU.getCUNode(), Asm, this, &SkeletonHolder);
DwarfCompileUnit &NewCU = *OwnedUnit;
NewCU.initSection(Asm->getObjFileLowering().getDwarfInfoSection(),
DwarfInfoSectionSym);
NewCU.initStmtList(DwarfLineSectionSym);
initSkeletonUnit(CU, NewCU.getUnitDie(), std::move(OwnedUnit));
return NewCU;
}
DwarfTypeUnit &DwarfDebug::constructSkeletonTU(DwarfTypeUnit &TU) {
DwarfCompileUnit &CU = static_cast<DwarfCompileUnit &>(
*SkeletonHolder.getUnits()[TU.getCU().getUniqueID()]);
auto OwnedUnit = make_unique<DwarfTypeUnit>(TU.getUniqueID(), CU, Asm, this,
&SkeletonHolder);
DwarfTypeUnit &NewTU = *OwnedUnit;
NewTU.setTypeSignature(TU.getTypeSignature());
NewTU.setType(nullptr);
NewTU.initSection(
Asm->getObjFileLowering().getDwarfTypesSection(TU.getTypeSignature()));
initSkeletonUnit(TU, NewTU.getUnitDie(), std::move(OwnedUnit));
return NewTU;
}
void DwarfDebug::emitDebugInfoDWO() {
assert(useSplitDwarf() && "No split dwarf debug info?");
InfoHolder.emitUnits(this, nullptr);
}
void DwarfDebug::emitDebugAbbrevDWO() {
assert(useSplitDwarf() && "No split dwarf?");
InfoHolder.emitAbbrevs(Asm->getObjFileLowering().getDwarfAbbrevDWOSection());
}
void DwarfDebug::emitDebugLineDWO() {
assert(useSplitDwarf() && "No split dwarf?");
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().getDwarfLineDWOSection());
SplitTypeUnitFileTable.Emit(Asm->OutStreamer);
}
void DwarfDebug::emitDebugStrDWO() {
assert(useSplitDwarf() && "No split dwarf?");
const MCSection *OffSec =
Asm->getObjFileLowering().getDwarfStrOffDWOSection();
const MCSymbol *StrSym = DwarfStrSectionSym;
InfoHolder.emitStrings(Asm->getObjFileLowering().getDwarfStrDWOSection(),
OffSec, StrSym);
}
MCDwarfDwoLineTable *DwarfDebug::getDwoLineTable(const DwarfCompileUnit &CU) {
if (!useSplitDwarf())
return nullptr;
if (SingleCU)
SplitTypeUnitFileTable.setCompilationDir(CU.getCUNode().getDirectory());
return &SplitTypeUnitFileTable;
}
static uint64_t makeTypeSignature(StringRef Identifier) {
MD5 Hash;
Hash.update(Identifier);
MD5::MD5Result Result;
Hash.final(Result);
return *reinterpret_cast<support::ulittle64_t *>(Result + 8);
}
void DwarfDebug::addDwarfTypeUnitType(DwarfCompileUnit &CU,
StringRef Identifier, DIE &RefDie,
DICompositeType CTy) {
if (!TypeUnitsUnderConstruction.empty() && AddrPool.hasBeenUsed())
return;
const DwarfTypeUnit *&TU = DwarfTypeUnits[CTy];
if (TU) {
CU.addDIETypeSignature(RefDie, *TU);
return;
}
bool TopLevelType = TypeUnitsUnderConstruction.empty();
AddrPool.resetUsedFlag();
auto OwnedUnit = make_unique<DwarfTypeUnit>(
InfoHolder.getUnits().size() + TypeUnitsUnderConstruction.size(), CU, Asm,
this, &InfoHolder, getDwoLineTable(CU));
DwarfTypeUnit &NewTU = *OwnedUnit;
DIE &UnitDie = NewTU.getUnitDie();
TU = &NewTU;
TypeUnitsUnderConstruction.push_back(
std::make_pair(std::move(OwnedUnit), CTy));
NewTU.addUInt(UnitDie, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
CU.getLanguage());
uint64_t Signature = makeTypeSignature(Identifier);
NewTU.setTypeSignature(Signature);
if (useSplitDwarf())
NewTU.initSection(Asm->getObjFileLowering().getDwarfTypesDWOSection(),
DwarfTypesDWOSectionSym);
else {
CU.applyStmtList(UnitDie);
NewTU.initSection(
Asm->getObjFileLowering().getDwarfTypesSection(Signature));
}
NewTU.setType(NewTU.createTypeDIE(CTy));
if (TopLevelType) {
auto TypeUnitsToAdd = std::move(TypeUnitsUnderConstruction);
TypeUnitsUnderConstruction.clear();
if (AddrPool.hasBeenUsed()) {
for (const auto &TU : TypeUnitsToAdd)
DwarfTypeUnits.erase(TU.second);
CU.constructTypeDIE(RefDie, CTy);
return;
}
for (auto &TU : TypeUnitsToAdd) {
if (useSplitDwarf())
TU.first->setSkeleton(constructSkeletonTU(*TU.first));
InfoHolder.addUnit(std::move(TU.first));
}
}
CU.addDIETypeSignature(RefDie, NewTU);
}
void DwarfDebug::attachLowHighPC(DwarfCompileUnit &Unit, DIE &D,
const MCSymbol *Begin, const MCSymbol *End) {
assert(Begin && "Begin label should not be null!");
assert(End && "End label should not be null!");
assert(Begin->isDefined() && "Invalid starting label");
assert(End->isDefined() && "Invalid end label");
Unit.addLabelAddress(D, dwarf::DW_AT_low_pc, Begin);
if (DwarfVersion < 4 || Triple(Asm->getTargetTriple()).isOSBinFormatMachO())
Unit.addLabelAddress(D, dwarf::DW_AT_high_pc, End);
else
Unit.addLabelDelta(D, dwarf::DW_AT_high_pc, End, Begin);
}
void DwarfDebug::addAccelName(StringRef Name, const DIE &Die) {
if (!useDwarfAccelTables())
return;
AccelNames.AddName(Name, InfoHolder.getStringPool().getSymbol(*Asm, Name),
&Die);
}
void DwarfDebug::addAccelObjC(StringRef Name, const DIE &Die) {
if (!useDwarfAccelTables())
return;
AccelObjC.AddName(Name, InfoHolder.getStringPool().getSymbol(*Asm, Name),
&Die);
}
void DwarfDebug::addAccelNamespace(StringRef Name, const DIE &Die) {
if (!useDwarfAccelTables())
return;
AccelNamespace.AddName(Name, InfoHolder.getStringPool().getSymbol(*Asm, Name),
&Die);
}
void DwarfDebug::addAccelType(StringRef Name, const DIE &Die, char Flags) {
if (!useDwarfAccelTables())
return;
AccelTypes.AddName(Name, InfoHolder.getStringPool().getSymbol(*Asm, Name),
&Die);
}