#include "DwarfCompileUnit.h"
-
+#include "DwarfExpression.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/Instruction.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCStreamer.h"
+#include "llvm/Target/TargetFrameLowering.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetSubtargetInfo.h"
#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
namespace llvm {
DwarfCompileUnit::DwarfCompileUnit(unsigned UID, DICompileUnit Node,
AsmPrinter *A, DwarfDebug *DW,
DwarfFile *DWU)
- : DwarfUnit(UID, dwarf::DW_TAG_compile_unit, Node, A, DW, DWU) {
+ : DwarfUnit(UID, dwarf::DW_TAG_compile_unit, Node, A, DW, DWU),
+ Skeleton(nullptr), LabelBegin(nullptr), BaseAddress(nullptr) {
insertDIE(Node, &getUnitDie());
}
DIScope GVContext = GV.getContext();
DIType GTy = DD->resolve(GV.getType());
- // If this is a static data member definition, some attributes belong
- // to the declaration DIE.
- DIE *VariableDIE = nullptr;
- bool IsStaticMember = false;
- DIDerivedType SDMDecl = GV.getStaticDataMemberDeclaration();
- if (SDMDecl.Verify()) {
- assert(SDMDecl.isStaticMember() && "Expected static member decl");
- // We need the declaration DIE that is in the static member's class.
- VariableDIE = getOrCreateStaticMemberDIE(SDMDecl);
- IsStaticMember = true;
- }
-
- // If this is not a static data member definition, create the variable
- // DIE and add the initial set of attributes to it.
- if (!VariableDIE) {
- // Construct the context before querying for the existence of the DIE in
- // case such construction creates the DIE.
- DIE *ContextDIE = getOrCreateContextDIE(GVContext);
+ // Construct the context before querying for the existence of the DIE in
+ // case such construction creates the DIE.
+ DIE *ContextDIE = getOrCreateContextDIE(GVContext);
- // Add to map.
- VariableDIE = &createAndAddDIE(GV.getTag(), *ContextDIE, GV);
+ // Add to map.
+ DIE *VariableDIE = &createAndAddDIE(GV.getTag(), *ContextDIE, GV);
+ DIScope DeclContext;
+ if (DIDerivedType SDMDecl = GV.getStaticDataMemberDeclaration()) {
+ DeclContext = resolve(SDMDecl.getContext());
+ assert(SDMDecl.isStaticMember() && "Expected static member decl");
+ assert(GV.isDefinition());
+ // We need the declaration DIE that is in the static member's class.
+ DIE *VariableSpecDIE = getOrCreateStaticMemberDIE(SDMDecl);
+ addDIEEntry(*VariableDIE, dwarf::DW_AT_specification, *VariableSpecDIE);
+ } else {
+ DeclContext = GV.getContext();
// Add name and type.
addString(*VariableDIE, dwarf::DW_AT_name, GV.getDisplayName());
addType(*VariableDIE, GTy);
addSourceLine(*VariableDIE, GV);
}
+ if (!GV.isDefinition())
+ addFlag(*VariableDIE, dwarf::DW_AT_declaration);
+
// Add location.
bool addToAccelTable = false;
- DIE *VariableSpecDIE = nullptr;
bool isGlobalVariable = GV.getGlobal() != nullptr;
if (isGlobalVariable) {
addToAccelTable = true;
addUInt(*Loc, dwarf::DW_FORM_udata,
DD->getAddressPool().getIndex(Sym, /* TLS */ true));
}
- // 3) followed by a custom OP to make the debugger do a TLS lookup.
- addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_push_tls_address);
+ // 3) followed by an OP to make the debugger do a TLS lookup.
+ addUInt(*Loc, dwarf::DW_FORM_data1,
+ DD->useGNUTLSOpcode() ? dwarf::DW_OP_GNU_push_tls_address
+ : dwarf::DW_OP_form_tls_address);
} else {
DD->addArangeLabel(SymbolCU(this, Sym));
addOpAddress(*Loc, Sym);
}
- // A static member's declaration is already flagged as such.
- if (!SDMDecl.Verify() && !GV.isDefinition())
- addFlag(*VariableDIE, dwarf::DW_AT_declaration);
- // Do not create specification DIE if context is either compile unit
- // or a subprogram.
- if (GVContext && GV.isDefinition() && !GVContext.isCompileUnit() &&
- !GVContext.isFile() && !DD->isSubprogramContext(GVContext)) {
- // Create specification DIE.
- VariableSpecDIE = &createAndAddDIE(dwarf::DW_TAG_variable, UnitDie);
- addDIEEntry(*VariableSpecDIE, dwarf::DW_AT_specification, *VariableDIE);
- addBlock(*VariableSpecDIE, dwarf::DW_AT_location, Loc);
- // A static member's declaration is already flagged as such.
- if (!SDMDecl.Verify())
- addFlag(*VariableDIE, dwarf::DW_AT_declaration);
- } else {
- addBlock(*VariableDIE, dwarf::DW_AT_location, Loc);
- }
+
+ addBlock(*VariableDIE, dwarf::DW_AT_location, Loc);
// Add the linkage name.
StringRef LinkageName = GV.getLinkageName();
if (!LinkageName.empty())
// From DWARF4: DIEs to which DW_AT_linkage_name may apply include:
// TAG_common_block, TAG_constant, TAG_entry_point, TAG_subprogram and
// TAG_variable.
- addString(IsStaticMember && VariableSpecDIE ? *VariableSpecDIE
- : *VariableDIE,
+ addString(*VariableDIE,
DD->getDwarfVersion() >= 4 ? dwarf::DW_AT_linkage_name
: dwarf::DW_AT_MIPS_linkage_name,
GlobalValue::getRealLinkageName(LinkageName));
} else if (const ConstantInt *CI =
dyn_cast_or_null<ConstantInt>(GV.getConstant())) {
- // AT_const_value was added when the static member was created. To avoid
- // emitting AT_const_value multiple times, we only add AT_const_value when
- // it is not a static member.
- if (!IsStaticMember)
- addConstantValue(*VariableDIE, CI, GTy);
+ addConstantValue(*VariableDIE, CI, GTy);
} else if (const ConstantExpr *CE = getMergedGlobalExpr(GV.getConstant())) {
addToAccelTable = true;
// GV is a merged global.
addBlock(*VariableDIE, dwarf::DW_AT_location, Loc);
}
- DIE *ResultDIE = VariableSpecDIE ? VariableSpecDIE : VariableDIE;
-
if (addToAccelTable) {
- DD->addAccelName(GV.getName(), *ResultDIE);
+ DD->addAccelName(GV.getName(), *VariableDIE);
// If the linkage name is different than the name, go ahead and output
// that as well into the name table.
if (GV.getLinkageName() != "" && GV.getName() != GV.getLinkageName())
- DD->addAccelName(GV.getLinkageName(), *ResultDIE);
+ DD->addAccelName(GV.getLinkageName(), *VariableDIE);
}
- addGlobalName(GV.getName(), *ResultDIE, GV.getContext());
- return ResultDIE;
+ addGlobalName(GV.getName(), *VariableDIE, DeclContext);
+ return VariableDIE;
}
void DwarfCompileUnit::addRange(RangeSpan Range) {
CURanges.back().setEnd(Range.getEnd());
}
+void DwarfCompileUnit::addSectionLabel(DIE &Die, dwarf::Attribute Attribute,
+ const MCSymbol *Label,
+ const MCSymbol *Sec) {
+ if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
+ addLabel(Die, Attribute,
+ DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
+ : dwarf::DW_FORM_data4,
+ Label);
+ else
+ addSectionDelta(Die, Attribute, Label, Sec);
+}
+
void DwarfCompileUnit::initStmtList(MCSymbol *DwarfLineSectionSym) {
// Define start line table label for each Compile Unit.
MCSymbol *LineTableStartSym =
// left in the skeleton CU and so not included.
// The line table entries are not always emitted in assembly, so it
// is not okay to use line_table_start here.
- if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
- addSectionLabel(UnitDie, dwarf::DW_AT_stmt_list, LineTableStartSym);
- else
- addSectionDelta(UnitDie, dwarf::DW_AT_stmt_list, LineTableStartSym,
- DwarfLineSectionSym);
+ addSectionLabel(UnitDie, dwarf::DW_AT_stmt_list, LineTableStartSym,
+ DwarfLineSectionSym);
}
void DwarfCompileUnit::applyStmtList(DIE &D) {
// and DW_AT_high_pc attributes. If there are global variables in this
// scope then create and insert DIEs for these variables.
DIE &DwarfCompileUnit::updateSubprogramScopeDIE(DISubprogram SP) {
- DIE *SPDie = getOrCreateSubprogramDIE(SP);
+ DIE *SPDie = getOrCreateSubprogramDIE(SP, includeMinimalInlineScopes());
attachLowHighPC(*SPDie, DD->getFunctionBeginSym(), DD->getFunctionEndSym());
if (!DD->getCurrentFunction()->getTarget().Options.DisableFramePointerElim(
addFlag(*SPDie, dwarf::DW_AT_APPLE_omit_frame_ptr);
// Only include DW_AT_frame_base in full debug info
- if (getCUNode().getEmissionKind() != DIBuilder::LineTablesOnly) {
- const TargetRegisterInfo *RI =
- Asm->TM.getSubtargetImpl()->getRegisterInfo();
+ if (!includeMinimalInlineScopes()) {
+ const TargetRegisterInfo *RI = Asm->MF->getSubtarget().getRegisterInfo();
MachineLocation Location(RI->getFrameRegister(*Asm->MF));
- addAddress(*SPDie, dwarf::DW_AT_frame_base, Location);
+ if (RI->isPhysicalRegister(Location.getReg()))
+ addAddress(*SPDie, dwarf::DW_AT_frame_base, Location);
}
// Add name to the name table, we do this here because we're guaranteed
return *SPDie;
}
+// Construct a DIE for this scope.
+void DwarfCompileUnit::constructScopeDIE(
+ LexicalScope *Scope, SmallVectorImpl<std::unique_ptr<DIE>> &FinalChildren) {
+ if (!Scope || !Scope->getScopeNode())
+ return;
+
+ 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;
+
+ // We try to create the scope DIE first, then the children DIEs. This will
+ // avoid creating un-used children then removing them later when we find out
+ // the scope DIE is null.
+ std::unique_ptr<DIE> ScopeDIE;
+ if (Scope->getParent() && DS.isSubprogram()) {
+ ScopeDIE = constructInlinedScopeDIE(Scope);
+ if (!ScopeDIE)
+ return;
+ // We create children when the scope DIE is not null.
+ createScopeChildrenDIE(Scope, Children);
+ } else {
+ // Early exit when we know the scope DIE is going to be null.
+ if (DD->isLexicalScopeDIENull(Scope))
+ return;
+
+ unsigned ChildScopeCount;
+
+ // We create children here when we know the scope DIE is not going to be
+ // null and the children will be added to the scope DIE.
+ createScopeChildrenDIE(Scope, Children, &ChildScopeCount);
+
+ // Skip imported directives in gmlt-like data.
+ if (!includeMinimalInlineScopes()) {
+ // There is no need to emit empty lexical block DIE.
+ for (const auto &E : DD->findImportedEntitiesForScope(DS))
+ Children.push_back(
+ constructImportedEntityDIE(DIImportedEntity(E.second)));
+ }
+
+ // If there are only other scopes as children, put them directly in the
+ // parent instead, as this scope would serve no purpose.
+ if (Children.size() == ChildScopeCount) {
+ FinalChildren.insert(FinalChildren.end(),
+ std::make_move_iterator(Children.begin()),
+ std::make_move_iterator(Children.end()));
+ return;
+ }
+ ScopeDIE = constructLexicalScopeDIE(Scope);
+ assert(ScopeDIE && "Scope DIE should not be null.");
+ }
+
+ // Add children
+ for (auto &I : Children)
+ ScopeDIE->addChild(std::move(I));
+
+ FinalChildren.push_back(std::move(ScopeDIE));
+}
+
+void DwarfCompileUnit::addSectionDelta(DIE &Die, dwarf::Attribute Attribute,
+ const MCSymbol *Hi, const MCSymbol *Lo) {
+ DIEValue *Value = new (DIEValueAllocator) DIEDelta(Hi, Lo);
+ Die.addValue(Attribute, DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
+ : dwarf::DW_FORM_data4,
+ Value);
+}
+
+void DwarfCompileUnit::addScopeRangeList(DIE &ScopeDIE,
+ SmallVector<RangeSpan, 2> Range) {
+ // Emit offset in .debug_range as a relocatable label. emitDIE will handle
+ // emitting it appropriately.
+ auto *RangeSectionSym = DD->getRangeSectionSym();
+
+ RangeSpanList List(
+ Asm->GetTempSymbol("debug_ranges", DD->getNextRangeNumber()),
+ std::move(Range));
+
+ // Under fission, ranges are specified by constant offsets relative to the
+ // CU's DW_AT_GNU_ranges_base.
+ if (isDwoUnit())
+ addSectionDelta(ScopeDIE, dwarf::DW_AT_ranges, List.getSym(),
+ RangeSectionSym);
+ else
+ addSectionLabel(ScopeDIE, dwarf::DW_AT_ranges, List.getSym(),
+ RangeSectionSym);
+
+ // Add the range list to the set of ranges to be emitted.
+ (Skeleton ? Skeleton : this)->CURangeLists.push_back(std::move(List));
+}
+
+void DwarfCompileUnit::attachRangesOrLowHighPC(
+ DIE &Die, SmallVector<RangeSpan, 2> Ranges) {
+ if (Ranges.size() == 1) {
+ const auto &single = Ranges.front();
+ attachLowHighPC(Die, single.getStart(), single.getEnd());
+ } else
+ addScopeRangeList(Die, std::move(Ranges));
+}
+
+void DwarfCompileUnit::attachRangesOrLowHighPC(
+ DIE &Die, const SmallVectorImpl<InsnRange> &Ranges) {
+ SmallVector<RangeSpan, 2> List;
+ List.reserve(Ranges.size());
+ for (const InsnRange &R : Ranges)
+ List.push_back(RangeSpan(DD->getLabelBeforeInsn(R.first),
+ DD->getLabelAfterInsn(R.second)));
+ attachRangesOrLowHighPC(Die, std::move(List));
+}
+
+// This scope represents inlined body of a function. Construct DIE to
+// represent this concrete inlined copy of the function.
+std::unique_ptr<DIE>
+DwarfCompileUnit::constructInlinedScopeDIE(LexicalScope *Scope) {
+ assert(Scope->getScopeNode());
+ DIScope DS(Scope->getScopeNode());
+ DISubprogram InlinedSP = getDISubprogram(DS);
+ // Find the subprogram's DwarfCompileUnit in the SPMap in case the subprogram
+ // was inlined from another compile unit.
+ DIE *OriginDIE = DU->getAbstractSPDies()[InlinedSP];
+ assert(OriginDIE && "Unable to find original DIE for an inlined subprogram.");
+
+ auto ScopeDIE = make_unique<DIE>(dwarf::DW_TAG_inlined_subroutine);
+ addDIEEntry(*ScopeDIE, dwarf::DW_AT_abstract_origin, *OriginDIE);
+
+ attachRangesOrLowHighPC(*ScopeDIE, Scope->getRanges());
+
+ // Add the call site information to the DIE.
+ DILocation DL(Scope->getInlinedAt());
+ addUInt(*ScopeDIE, dwarf::DW_AT_call_file, None,
+ getOrCreateSourceID(DL.getFilename(), DL.getDirectory()));
+ addUInt(*ScopeDIE, dwarf::DW_AT_call_line, None, DL.getLineNumber());
+
+ // Add name to the name table, we do this here because we're guaranteed
+ // to have concrete versions of our DW_TAG_inlined_subprogram nodes.
+ DD->addSubprogramNames(InlinedSP, *ScopeDIE);
+
+ return ScopeDIE;
+}
+
+// Construct new DW_TAG_lexical_block for this scope and attach
+// DW_AT_low_pc/DW_AT_high_pc labels.
+std::unique_ptr<DIE>
+DwarfCompileUnit::constructLexicalScopeDIE(LexicalScope *Scope) {
+ if (DD->isLexicalScopeDIENull(Scope))
+ return nullptr;
+
+ auto ScopeDIE = make_unique<DIE>(dwarf::DW_TAG_lexical_block);
+ if (Scope->isAbstractScope())
+ return ScopeDIE;
+
+ attachRangesOrLowHighPC(*ScopeDIE, Scope->getRanges());
+
+ return ScopeDIE;
+}
+
+/// constructVariableDIE - Construct a DIE for the given DbgVariable.
+std::unique_ptr<DIE> DwarfCompileUnit::constructVariableDIE(DbgVariable &DV,
+ bool Abstract) {
+ auto D = constructVariableDIEImpl(DV, Abstract);
+ DV.setDIE(*D);
+ return D;
+}
+
+std::unique_ptr<DIE>
+DwarfCompileUnit::constructVariableDIEImpl(const DbgVariable &DV,
+ bool Abstract) {
+ // Define variable debug information entry.
+ auto VariableDie = make_unique<DIE>(DV.getTag());
+
+ if (Abstract) {
+ applyVariableAttributes(DV, *VariableDie);
+ return VariableDie;
+ }
+
+ // Add variable address.
+
+ unsigned Offset = DV.getDotDebugLocOffset();
+ if (Offset != ~0U) {
+ addLocationList(*VariableDie, dwarf::DW_AT_location, Offset);
+ return VariableDie;
+ }
+
+ // Check if variable is described by a DBG_VALUE instruction.
+ if (const MachineInstr *DVInsn = DV.getMInsn()) {
+ assert(DVInsn->getNumOperands() == 4);
+ if (DVInsn->getOperand(0).isReg()) {
+ const MachineOperand RegOp = DVInsn->getOperand(0);
+ // If the second operand is an immediate, this is an indirect value.
+ if (DVInsn->getOperand(1).isImm()) {
+ MachineLocation Location(RegOp.getReg(),
+ DVInsn->getOperand(1).getImm());
+ addVariableAddress(DV, *VariableDie, Location);
+ } else if (RegOp.getReg())
+ addVariableAddress(DV, *VariableDie, MachineLocation(RegOp.getReg()));
+ } else if (DVInsn->getOperand(0).isImm())
+ addConstantValue(*VariableDie, DVInsn->getOperand(0), DV.getType());
+ else if (DVInsn->getOperand(0).isFPImm())
+ addConstantFPValue(*VariableDie, DVInsn->getOperand(0));
+ else if (DVInsn->getOperand(0).isCImm())
+ addConstantValue(*VariableDie, DVInsn->getOperand(0).getCImm(),
+ DV.getType());
+
+ return VariableDie;
+ }
+
+ // .. else use frame index.
+ if (DV.getFrameIndex().back() == ~0)
+ return VariableDie;
+
+ auto Expr = DV.getExpression().begin();
+ DIELoc *Loc = new (DIEValueAllocator) DIELoc();
+ DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
+ for (auto FI : DV.getFrameIndex()) {
+ unsigned FrameReg = 0;
+ const TargetFrameLowering *TFI = Asm->MF->getSubtarget().getFrameLowering();
+ int Offset = TFI->getFrameIndexReference(*Asm->MF, FI, FrameReg);
+ assert(Expr != DV.getExpression().end() &&
+ "Wrong number of expressions");
+ DwarfExpr.AddMachineRegIndirect(FrameReg, Offset);
+ DwarfExpr.AddExpression(Expr->begin(), Expr->end());
+ ++Expr;
+ }
+ addBlock(*VariableDie, dwarf::DW_AT_location, Loc);
+
+ return VariableDie;
+}
+
+std::unique_ptr<DIE> DwarfCompileUnit::constructVariableDIE(
+ DbgVariable &DV, const LexicalScope &Scope, DIE *&ObjectPointer) {
+ auto Var = constructVariableDIE(DV, Scope.isAbstractScope());
+ if (DV.isObjectPointer())
+ ObjectPointer = Var.get();
+ return Var;
+}
+
+DIE *DwarfCompileUnit::createScopeChildrenDIE(
+ LexicalScope *Scope, SmallVectorImpl<std::unique_ptr<DIE>> &Children,
+ unsigned *ChildScopeCount) {
+ DIE *ObjectPointer = nullptr;
+
+ for (DbgVariable *DV : DU->getScopeVariables().lookup(Scope))
+ Children.push_back(constructVariableDIE(*DV, *Scope, ObjectPointer));
+
+ unsigned ChildCountWithoutScopes = Children.size();
+
+ for (LexicalScope *LS : Scope->getChildren())
+ constructScopeDIE(LS, Children);
+
+ if (ChildScopeCount)
+ *ChildScopeCount = Children.size() - ChildCountWithoutScopes;
+
+ return ObjectPointer;
+}
+
+void DwarfCompileUnit::constructSubprogramScopeDIE(LexicalScope *Scope) {
+ assert(Scope && Scope->getScopeNode());
+ assert(!Scope->getInlinedAt());
+ assert(!Scope->isAbstractScope());
+ DISubprogram Sub(Scope->getScopeNode());
+
+ assert(Sub.isSubprogram());
+
+ DD->getProcessedSPNodes().insert(Sub);
+
+ DIE &ScopeDIE = updateSubprogramScopeDIE(Sub);
+
+ // If this is a variadic function, add an unspecified parameter.
+ DITypeArray FnArgs = Sub.getType().getTypeArray();
+
+ // Collect lexical scope children first.
+ // ObjectPointer might be a local (non-argument) local variable if it's a
+ // block's synthetic this pointer.
+ if (DIE *ObjectPointer = createAndAddScopeChildren(Scope, ScopeDIE))
+ addDIEEntry(ScopeDIE, dwarf::DW_AT_object_pointer, *ObjectPointer);
+
+ // If we have a single element of null, it is a function that returns void.
+ // If we have more than one elements and the last one is null, it is a
+ // variadic function.
+ if (FnArgs.getNumElements() > 1 &&
+ !FnArgs.getElement(FnArgs.getNumElements() - 1) &&
+ !includeMinimalInlineScopes())
+ ScopeDIE.addChild(make_unique<DIE>(dwarf::DW_TAG_unspecified_parameters));
+}
+
+DIE *DwarfCompileUnit::createAndAddScopeChildren(LexicalScope *Scope,
+ DIE &ScopeDIE) {
+ // We create children when the scope DIE is not null.
+ SmallVector<std::unique_ptr<DIE>, 8> Children;
+ DIE *ObjectPointer = createScopeChildrenDIE(Scope, Children);
+
+ // Add children
+ for (auto &I : Children)
+ ScopeDIE.addChild(std::move(I));
+
+ return ObjectPointer;
+}
+
+void
+DwarfCompileUnit::constructAbstractSubprogramScopeDIE(LexicalScope *Scope) {
+ DIE *&AbsDef = DU->getAbstractSPDies()[Scope->getScopeNode()];
+ if (AbsDef)
+ return;
+
+ DISubprogram SP(Scope->getScopeNode());
+
+ DIE *ContextDIE;
+
+ if (includeMinimalInlineScopes())
+ ContextDIE = &getUnitDie();
+ // Some of this is duplicated from DwarfUnit::getOrCreateSubprogramDIE, with
+ // the important distinction that the DIDescriptor is not associated with the
+ // DIE (since the DIDescriptor will be associated with the concrete DIE, if
+ // any). It could be refactored to some common utility function.
+ else if (DISubprogram SPDecl = SP.getFunctionDeclaration()) {
+ ContextDIE = &getUnitDie();
+ getOrCreateSubprogramDIE(SPDecl);
+ } else
+ ContextDIE = getOrCreateContextDIE(resolve(SP.getContext()));
+
+ // Passing null as the associated DIDescriptor because the abstract definition
+ // shouldn't be found by lookup.
+ AbsDef =
+ &createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE, DIDescriptor());
+ applySubprogramAttributesToDefinition(SP, *AbsDef);
+
+ if (!includeMinimalInlineScopes())
+ addUInt(*AbsDef, dwarf::DW_AT_inline, None, dwarf::DW_INL_inlined);
+ if (DIE *ObjectPointer = createAndAddScopeChildren(Scope, *AbsDef))
+ addDIEEntry(*AbsDef, dwarf::DW_AT_object_pointer, *ObjectPointer);
+}
+
+std::unique_ptr<DIE>
+DwarfCompileUnit::constructImportedEntityDIE(const DIImportedEntity &Module) {
+ assert(Module.Verify() &&
+ "Use one of the MDNode * overloads to handle invalid metadata");
+ std::unique_ptr<DIE> IMDie = make_unique<DIE>((dwarf::Tag)Module.getTag());
+ insertDIE(Module, IMDie.get());
+ DIE *EntityDie;
+ DIDescriptor Entity = resolve(Module.getEntity());
+ if (Entity.isNameSpace())
+ EntityDie = getOrCreateNameSpace(DINameSpace(Entity));
+ else if (Entity.isSubprogram())
+ EntityDie = getOrCreateSubprogramDIE(DISubprogram(Entity));
+ else if (Entity.isType())
+ EntityDie = getOrCreateTypeDIE(DIType(Entity));
+ else if (Entity.isGlobalVariable())
+ EntityDie = getOrCreateGlobalVariableDIE(DIGlobalVariable(Entity));
+ else
+ EntityDie = getDIE(Entity);
+ assert(EntityDie);
+ addSourceLine(*IMDie, Module.getLineNumber(),
+ Module.getContext().getFilename(),
+ Module.getContext().getDirectory());
+ addDIEEntry(*IMDie, dwarf::DW_AT_import, *EntityDie);
+ StringRef Name = Module.getName();
+ if (!Name.empty())
+ addString(*IMDie, dwarf::DW_AT_name, Name);
+
+ return IMDie;
+}
+
+void DwarfCompileUnit::finishSubprogramDefinition(DISubprogram SP) {
+ DIE *D = getDIE(SP);
+ if (DIE *AbsSPDIE = DU->getAbstractSPDies().lookup(SP)) {
+ if (D)
+ // If this subprogram has an abstract definition, reference that
+ addDIEEntry(*D, dwarf::DW_AT_abstract_origin, *AbsSPDIE);
+ } else {
+ if (!D && !includeMinimalInlineScopes())
+ // Lazily construct the subprogram if we didn't see either concrete or
+ // inlined versions during codegen. (except in -gmlt ^ where we want
+ // to omit these entirely)
+ D = getOrCreateSubprogramDIE(SP);
+ if (D)
+ // And attach the attributes
+ applySubprogramAttributesToDefinition(SP, *D);
+ }
+}
+void DwarfCompileUnit::collectDeadVariables(DISubprogram SP) {
+ 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)
+ return;
+
+ DIE *SPDIE = DU->getAbstractSPDies().lookup(SP);
+ if (!SPDIE)
+ SPDIE = 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, DIExpression(), DD);
+ auto VariableDie = constructVariableDIE(NewVar);
+ applyVariableAttributes(NewVar, *VariableDie);
+ SPDIE->addChild(std::move(VariableDie));
+ }
+}
+
+void DwarfCompileUnit::emitHeader(const MCSymbol *ASectionSym) const {
+ // Don't bother labeling the .dwo unit, as its offset isn't used.
+ if (!Skeleton)
+ Asm->OutStreamer.EmitLabel(LabelBegin);
+
+ DwarfUnit::emitHeader(ASectionSym);
+}
+
+/// addGlobalName - Add a new global name to the compile unit.
+void DwarfCompileUnit::addGlobalName(StringRef Name, DIE &Die,
+ DIScope Context) {
+ if (includeMinimalInlineScopes())
+ return;
+ std::string FullName = getParentContextString(Context) + Name.str();
+ GlobalNames[FullName] = &Die;
+}
+
+/// Add a new global type to the unit.
+void DwarfCompileUnit::addGlobalType(DIType Ty, const DIE &Die,
+ DIScope Context) {
+ if (includeMinimalInlineScopes())
+ return;
+ std::string FullName = getParentContextString(Context) + Ty.getName().str();
+ GlobalTypes[FullName] = &Die;
+}
+
+/// addVariableAddress - Add DW_AT_location attribute for a
+/// DbgVariable based on provided MachineLocation.
+void DwarfCompileUnit::addVariableAddress(const DbgVariable &DV, DIE &Die,
+ MachineLocation Location) {
+ if (DV.variableHasComplexAddress())
+ addComplexAddress(DV, Die, dwarf::DW_AT_location, Location);
+ else if (DV.isBlockByrefVariable())
+ addBlockByrefAddress(DV, Die, dwarf::DW_AT_location, Location);
+ else
+ addAddress(Die, dwarf::DW_AT_location, Location);
+}
+
+/// Add an address attribute to a die based on the location provided.
+void DwarfCompileUnit::addAddress(DIE &Die, dwarf::Attribute Attribute,
+ const MachineLocation &Location) {
+ DIELoc *Loc = new (DIEValueAllocator) DIELoc();
+
+ bool validReg;
+ if (Location.isReg())
+ validReg = addRegisterOpPiece(*Loc, Location.getReg());
+ else
+ validReg = addRegisterOffset(*Loc, Location.getReg(), Location.getOffset());
+
+ if (!validReg)
+ return;
+
+ // Now attach the location information to the DIE.
+ addBlock(Die, Attribute, Loc);
+}
+
+/// Start with the address based on the location provided, and generate the
+/// DWARF information necessary to find the actual variable given the extra
+/// address information encoded in the DbgVariable, starting from the starting
+/// location. Add the DWARF information to the die.
+void DwarfCompileUnit::addComplexAddress(const DbgVariable &DV, DIE &Die,
+ dwarf::Attribute Attribute,
+ const MachineLocation &Location) {
+ DIELoc *Loc = new (DIEValueAllocator) DIELoc();
+ DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
+ assert(DV.getExpression().size() == 1);
+ DIExpression Expr = DV.getExpression().back();
+ bool ValidReg;
+ if (Location.getOffset()) {
+ ValidReg = DwarfExpr.AddMachineRegIndirect(Location.getReg(),
+ Location.getOffset());
+ if (ValidReg)
+ DwarfExpr.AddExpression(Expr.begin(), Expr.end());
+ } else
+ ValidReg = DwarfExpr.AddMachineRegExpression(Expr, Location.getReg());
+
+ // Now attach the location information to the DIE.
+ if (ValidReg)
+ addBlock(Die, Attribute, Loc);
+}
+
+/// Add a Dwarf loclistptr attribute data and value.
+void DwarfCompileUnit::addLocationList(DIE &Die, dwarf::Attribute Attribute,
+ unsigned Index) {
+ DIEValue *Value = new (DIEValueAllocator) DIELocList(Index);
+ dwarf::Form Form = DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
+ : dwarf::DW_FORM_data4;
+ Die.addValue(Attribute, Form, Value);
+}
+
+void DwarfCompileUnit::applyVariableAttributes(const DbgVariable &Var,
+ DIE &VariableDie) {
+ StringRef Name = Var.getName();
+ if (!Name.empty())
+ addString(VariableDie, dwarf::DW_AT_name, Name);
+ addSourceLine(VariableDie, Var.getVariable());
+ addType(VariableDie, Var.getType());
+ if (Var.isArtificial())
+ addFlag(VariableDie, dwarf::DW_AT_artificial);
+}
+
+/// Add a Dwarf expression attribute data and value.
+void DwarfCompileUnit::addExpr(DIELoc &Die, dwarf::Form Form,
+ const MCExpr *Expr) {
+ DIEValue *Value = new (DIEValueAllocator) DIEExpr(Expr);
+ Die.addValue((dwarf::Attribute)0, Form, Value);
+}
+
+void DwarfCompileUnit::applySubprogramAttributesToDefinition(DISubprogram SP,
+ DIE &SPDie) {
+ DISubprogram SPDecl = SP.getFunctionDeclaration();
+ DIScope Context = resolve(SPDecl ? SPDecl.getContext() : SP.getContext());
+ applySubprogramAttributes(SP, SPDie, includeMinimalInlineScopes());
+ addGlobalName(SP.getName(), SPDie, Context);
+}
+
+bool DwarfCompileUnit::isDwoUnit() const {
+ return DD->useSplitDwarf() && Skeleton;
+}
+
+bool DwarfCompileUnit::includeMinimalInlineScopes() const {
+ return getCUNode().getEmissionKind() == DIBuilder::LineTablesOnly ||
+ (DD->useSplitDwarf() && !Skeleton);
+}
} // end llvm namespace
projects / oota-llvm.git / blobdiff