diff options
Diffstat (limited to 'lib/CodeGen/AsmPrinter/DwarfUnit.cpp')
| -rw-r--r-- | lib/CodeGen/AsmPrinter/DwarfUnit.cpp | 668 |
1 files changed, 126 insertions, 542 deletions
diff --git a/lib/CodeGen/AsmPrinter/DwarfUnit.cpp b/lib/CodeGen/AsmPrinter/DwarfUnit.cpp index 9538bee..919d9d2 100644 --- a/lib/CodeGen/AsmPrinter/DwarfUnit.cpp +++ b/lib/CodeGen/AsmPrinter/DwarfUnit.cpp @@ -12,7 +12,9 @@ //===----------------------------------------------------------------------===// #include "DwarfUnit.h" + #include "DwarfAccelTable.h" +#include "DwarfCompileUnit.h" #include "DwarfDebug.h" #include "llvm/ADT/APFloat.h" #include "llvm/IR/Constants.h" @@ -30,6 +32,7 @@ #include "llvm/Target/TargetLoweringObjectFile.h" #include "llvm/Target/TargetMachine.h" #include "llvm/Target/TargetRegisterInfo.h" +#include "llvm/Target/TargetSubtargetInfo.h" using namespace llvm; @@ -44,20 +47,12 @@ GenerateDwarfTypeUnits("generate-type-units", cl::Hidden, DwarfUnit::DwarfUnit(unsigned UID, dwarf::Tag UnitTag, DICompileUnit Node, AsmPrinter *A, DwarfDebug *DW, DwarfFile *DWU) : UniqueID(UID), CUNode(Node), UnitDie(UnitTag), DebugInfoOffset(0), Asm(A), - DD(DW), DU(DWU), IndexTyDie(nullptr), Section(nullptr), - Skeleton(nullptr) { + DD(DW), DU(DWU), IndexTyDie(nullptr), Section(nullptr) { assert(UnitTag == dwarf::DW_TAG_compile_unit || UnitTag == dwarf::DW_TAG_type_unit); DIEIntegerOne = new (DIEValueAllocator) DIEInteger(1); } -DwarfCompileUnit::DwarfCompileUnit(unsigned UID, DICompileUnit Node, - AsmPrinter *A, DwarfDebug *DW, - DwarfFile *DWU) - : DwarfUnit(UID, dwarf::DW_TAG_compile_unit, Node, A, DW, DWU) { - insertDIE(Node, &getUnitDie()); -} - DwarfTypeUnit::DwarfTypeUnit(unsigned UID, DwarfCompileUnit &CU, AsmPrinter *A, DwarfDebug *DW, DwarfFile *DWU, MCDwarfDwoLineTable *SplitLineTable) @@ -146,7 +141,7 @@ static bool isShareableAcrossCUs(DIDescriptor D) { /// will be kept in DwarfDebug for shareable DIEs. DIE *DwarfUnit::getDIE(DIDescriptor D) const { if (isShareableAcrossCUs(D)) - return DD->getDIE(D); + return DU->getDIE(D); return MDNodeToDieMap.lookup(D); } @@ -155,7 +150,7 @@ DIE *DwarfUnit::getDIE(DIDescriptor D) const { /// will be kept in DwarfDebug for shareable DIEs. void DwarfUnit::insertDIE(DIDescriptor Desc, DIE *D) { if (isShareableAcrossCUs(Desc)) { - DD->insertDIE(Desc, D); + DU->insertDIE(Desc, D); return; } MDNodeToDieMap.insert(std::make_pair(Desc, D)); @@ -206,10 +201,14 @@ void DwarfUnit::addSInt(DIELoc &Die, Optional<dwarf::Form> Form, /// table. void DwarfUnit::addString(DIE &Die, dwarf::Attribute Attribute, StringRef String) { - - if (!DD->useSplitDwarf()) + if (!isDwoUnit()) return addLocalString(Die, Attribute, String); + addIndexedString(Die, Attribute, String); +} + +void DwarfUnit::addIndexedString(DIE &Die, dwarf::Attribute Attribute, + StringRef String) { unsigned idx = DU->getStringPool().getIndex(*Asm, String); DIEValue *Value = new (DIEValueAllocator) DIEInteger(idx); DIEValue *Str = new (DIEValueAllocator) DIEString(Value, String); @@ -224,31 +223,12 @@ void DwarfUnit::addLocalString(DIE &Die, dwarf::Attribute Attribute, DIEValue *Value; if (Asm->MAI->doesDwarfUseRelocationsAcrossSections()) Value = new (DIEValueAllocator) DIELabel(Symb); - else { - MCSymbol *StringPool = DU->getStringPool().getSectionSymbol(); - Value = new (DIEValueAllocator) DIEDelta(Symb, StringPool); - } + else + Value = new (DIEValueAllocator) DIEDelta(Symb, DD->getDebugStrSym()); DIEValue *Str = new (DIEValueAllocator) DIEString(Value, String); Die.addValue(Attribute, dwarf::DW_FORM_strp, Str); } -/// addExpr - Add a Dwarf expression attribute data and value. -/// -void DwarfUnit::addExpr(DIELoc &Die, dwarf::Form Form, const MCExpr *Expr) { - DIEValue *Value = new (DIEValueAllocator) DIEExpr(Expr); - Die.addValue((dwarf::Attribute)0, Form, Value); -} - -/// addLocationList - Add a Dwarf loclistptr attribute data and value. -/// -void DwarfUnit::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); -} - /// addLabel - Add a Dwarf label attribute data and value. /// void DwarfUnit::addLabel(DIE &Die, dwarf::Attribute Attribute, dwarf::Form Form, @@ -261,16 +241,6 @@ void DwarfUnit::addLabel(DIELoc &Die, dwarf::Form Form, const MCSymbol *Label) { addLabel(Die, (dwarf::Attribute)0, Form, Label); } -/// addSectionLabel - Add a Dwarf section label attribute data and value. -/// -void DwarfUnit::addSectionLabel(DIE &Die, dwarf::Attribute Attribute, - const MCSymbol *Label) { - if (DD->getDwarfVersion() >= 4) - addLabel(Die, Attribute, dwarf::DW_FORM_sec_offset, Label); - else - addLabel(Die, Attribute, dwarf::DW_FORM_data4, Label); -} - /// addSectionOffset - Add an offset into a section attribute data and value. /// void DwarfUnit::addSectionOffset(DIE &Die, dwarf::Attribute Attribute, @@ -281,45 +251,6 @@ void DwarfUnit::addSectionOffset(DIE &Die, dwarf::Attribute Attribute, addUInt(Die, Attribute, dwarf::DW_FORM_data4, Integer); } -/// addLabelAddress - Add a dwarf label attribute data and value using -/// DW_FORM_addr or DW_FORM_GNU_addr_index. -/// -void DwarfCompileUnit::addLabelAddress(DIE &Die, dwarf::Attribute Attribute, - const MCSymbol *Label) { - - if (!DD->useSplitDwarf()) - return addLocalLabelAddress(Die, Attribute, Label); - - if (Label) - DD->addArangeLabel(SymbolCU(this, Label)); - - unsigned idx = DD->getAddressPool().getIndex(Label); - DIEValue *Value = new (DIEValueAllocator) DIEInteger(idx); - Die.addValue(Attribute, dwarf::DW_FORM_GNU_addr_index, Value); -} - -void DwarfCompileUnit::addLocalLabelAddress(DIE &Die, - dwarf::Attribute Attribute, - const MCSymbol *Label) { - if (Label) - DD->addArangeLabel(SymbolCU(this, Label)); - - Die.addValue(Attribute, dwarf::DW_FORM_addr, - Label ? (DIEValue *)new (DIEValueAllocator) DIELabel(Label) - : new (DIEValueAllocator) DIEInteger(0)); -} - -unsigned DwarfCompileUnit::getOrCreateSourceID(StringRef FileName, StringRef DirName) { - // If we print assembly, we can't separate .file entries according to - // compile units. Thus all files will belong to the default compile unit. - - // FIXME: add a better feature test than hasRawTextSupport. Even better, - // extend .file to support this. - return Asm->OutStreamer.EmitDwarfFileDirective( - 0, DirName, FileName, - Asm->OutStreamer.hasRawTextSupport() ? 0 : getUniqueID()); -} - unsigned DwarfTypeUnit::getOrCreateSourceID(StringRef FileName, StringRef DirName) { return SplitLineTable ? SplitLineTable->getFile(DirName, FileName) : getCU().getOrCreateSourceID(FileName, DirName); @@ -339,16 +270,6 @@ void DwarfUnit::addOpAddress(DIELoc &Die, const MCSymbol *Sym) { } } -/// addSectionDelta - Add a section label delta attribute data and value. -/// -void DwarfUnit::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 DwarfUnit::addLabelDelta(DIE &Die, dwarf::Attribute Attribute, const MCSymbol *Hi, const MCSymbol *Lo) { DIEValue *Value = new (DIEValueAllocator) DIEDelta(Hi, Lo); @@ -477,22 +398,12 @@ void DwarfUnit::addSourceLine(DIE &Die, DINameSpace NS) { addSourceLine(Die, NS.getLineNumber(), NS.getFilename(), NS.getDirectory()); } -/// addVariableAddress - Add DW_AT_location attribute for a -/// DbgVariable based on provided MachineLocation. -void DwarfUnit::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, - DV.getVariable().isIndirect()); -} - /// addRegisterOp - Add register operand. -void DwarfUnit::addRegisterOp(DIELoc &TheDie, unsigned Reg) { - const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo(); +// FIXME: Ideally, this would share the implementation with +// AsmPrinter::EmitDwarfRegOpPiece. +void DwarfUnit::addRegisterOpPiece(DIELoc &TheDie, unsigned Reg, + unsigned SizeInBits, unsigned OffsetInBits) { + const TargetRegisterInfo *RI = Asm->TM.getSubtargetImpl()->getRegisterInfo(); int DWReg = RI->getDwarfRegNum(Reg, false); bool isSubRegister = DWReg < 0; @@ -511,7 +422,7 @@ void DwarfUnit::addRegisterOp(DIELoc &TheDie, unsigned Reg) { return; } - // Emit register + // Emit register. if (DWReg < 32) addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + DWReg); else { @@ -519,18 +430,34 @@ void DwarfUnit::addRegisterOp(DIELoc &TheDie, unsigned Reg) { addUInt(TheDie, dwarf::DW_FORM_udata, DWReg); } - // Emit Mask - if (isSubRegister) { - unsigned Size = RI->getSubRegIdxSize(Idx); - unsigned Offset = RI->getSubRegIdxOffset(Idx); - if (Offset > 0) { + // Emit mask. + bool isPiece = SizeInBits > 0; + if (isSubRegister || isPiece) { + const unsigned SizeOfByte = 8; + unsigned RegSizeInBits = RI->getSubRegIdxSize(Idx); + unsigned RegOffsetInBits = RI->getSubRegIdxOffset(Idx); + unsigned PieceSizeInBits = std::max(SizeInBits, RegSizeInBits); + unsigned PieceOffsetInBits = OffsetInBits ? OffsetInBits : RegOffsetInBits; + assert(RegSizeInBits >= SizeInBits && "register smaller than value"); + + if (RegOffsetInBits != PieceOffsetInBits) { + // Manually shift the value into place, since the DW_OP_piece + // describes the part of the variable, not the position of the + // subregister. + addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_constu); + addUInt(TheDie, dwarf::DW_FORM_data1, RegOffsetInBits); + addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_shr); + } + + if (PieceOffsetInBits > 0 || PieceSizeInBits % SizeOfByte) { + assert(PieceSizeInBits > 0 && "piece has zero size"); addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_bit_piece); - addUInt(TheDie, dwarf::DW_FORM_data1, Size); - addUInt(TheDie, dwarf::DW_FORM_data1, Offset); - } else { - unsigned ByteSize = Size / 8; // Assuming 8 bits per byte. + addUInt(TheDie, dwarf::DW_FORM_data1, PieceSizeInBits); + addUInt(TheDie, dwarf::DW_FORM_data1, PieceOffsetInBits); + } else { + assert(PieceSizeInBits > 0 && "piece has zero size"); addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_piece); - addUInt(TheDie, dwarf::DW_FORM_data1, ByteSize); + addUInt(TheDie, dwarf::DW_FORM_data1, PieceSizeInBits/SizeOfByte); } } } @@ -538,9 +465,9 @@ void DwarfUnit::addRegisterOp(DIELoc &TheDie, unsigned Reg) { /// addRegisterOffset - Add register offset. void DwarfUnit::addRegisterOffset(DIELoc &TheDie, unsigned Reg, int64_t Offset) { - const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo(); + const TargetRegisterInfo *RI = Asm->TM.getSubtargetImpl()->getRegisterInfo(); unsigned DWReg = RI->getDwarfRegNum(Reg, false); - const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo(); + const TargetRegisterInfo *TRI = Asm->TM.getSubtargetImpl()->getRegisterInfo(); if (Reg == TRI->getFrameRegister(*Asm->MF)) // If variable offset is based in frame register then use fbreg. addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_fbreg); @@ -553,63 +480,6 @@ void DwarfUnit::addRegisterOffset(DIELoc &TheDie, unsigned Reg, addSInt(TheDie, dwarf::DW_FORM_sdata, Offset); } -/// addAddress - Add an address attribute to a die based on the location -/// provided. -void DwarfUnit::addAddress(DIE &Die, dwarf::Attribute Attribute, - const MachineLocation &Location, bool Indirect) { - DIELoc *Loc = new (DIEValueAllocator) DIELoc(); - - if (Location.isReg() && !Indirect) - addRegisterOp(*Loc, Location.getReg()); - else { - addRegisterOffset(*Loc, Location.getReg(), Location.getOffset()); - if (Indirect && !Location.isReg()) { - addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_deref); - } - } - - // Now attach the location information to the DIE. - addBlock(Die, Attribute, Loc); -} - -/// addComplexAddress - 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 DwarfUnit::addComplexAddress(const DbgVariable &DV, DIE &Die, - dwarf::Attribute Attribute, - const MachineLocation &Location) { - DIELoc *Loc = new (DIEValueAllocator) DIELoc(); - unsigned N = DV.getNumAddrElements(); - unsigned i = 0; - if (Location.isReg()) { - if (N >= 2 && DV.getAddrElement(0) == DIBuilder::OpPlus) { - // If first address element is OpPlus then emit - // DW_OP_breg + Offset instead of DW_OP_reg + Offset. - addRegisterOffset(*Loc, Location.getReg(), DV.getAddrElement(1)); - i = 2; - } else - addRegisterOp(*Loc, Location.getReg()); - } else - addRegisterOffset(*Loc, Location.getReg(), Location.getOffset()); - - for (; i < N; ++i) { - uint64_t Element = DV.getAddrElement(i); - if (Element == DIBuilder::OpPlus) { - addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst); - addUInt(*Loc, dwarf::DW_FORM_udata, DV.getAddrElement(++i)); - } else if (Element == DIBuilder::OpDeref) { - if (!Location.isReg()) - addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_deref); - } else - llvm_unreachable("unknown DIBuilder Opcode"); - } - - // Now attach the location information to the DIE. - addBlock(Die, Attribute, Loc); -} - /* Byref variables, in Blocks, are declared by the programmer as "SomeType VarName;", but the compiler creates a __Block_byref_x_VarName struct, and gives the variable VarName either the struct, or a pointer to the struct, as @@ -690,7 +560,7 @@ void DwarfUnit::addBlockByrefAddress(const DbgVariable &DV, DIE &Die, // Find the __forwarding field and the variable field in the __Block_byref // struct. - DIArray Fields = blockStruct.getTypeArray(); + DIArray Fields = blockStruct.getElements(); DIDerivedType varField; DIDerivedType forwardingField; @@ -712,7 +582,7 @@ void DwarfUnit::addBlockByrefAddress(const DbgVariable &DV, DIE &Die, DIELoc *Loc = new (DIEValueAllocator) DIELoc(); if (Location.isReg()) - addRegisterOp(*Loc, Location.getReg()); + addRegisterOpPiece(*Loc, Location.getReg()); else addRegisterOffset(*Loc, Location.getReg(), Location.getOffset()); @@ -1002,11 +872,9 @@ void DwarfUnit::updateAcceleratorTables(DIScope Context, DIType Ty, unsigned Flags = IsImplementation ? dwarf::DW_FLAG_type_implementation : 0; DD->addAccelType(Ty.getName(), TyDIE, Flags); - if ((!Context || Context.isCompileUnit() || Context.isFile() || - Context.isNameSpace()) && - getCUNode().getEmissionKind() != DIBuilder::LineTablesOnly) - GlobalTypes[getParentContextString(Context) + Ty.getName().str()] = - &TyDIE; + if (!Context || Context.isCompileUnit() || Context.isFile() || + Context.isNameSpace()) + addGlobalType(Ty, TyDIE, Context); } } @@ -1031,14 +899,6 @@ void DwarfUnit::addType(DIE &Entity, DIType Ty, dwarf::Attribute Attribute) { addDIEEntry(Entity, Attribute, Entry); } -/// addGlobalName - Add a new global name to the compile unit. -void DwarfUnit::addGlobalName(StringRef Name, DIE &Die, DIScope Context) { - if (getCUNode().getEmissionKind() == DIBuilder::LineTablesOnly) - return; - std::string FullName = getParentContextString(Context) + Name.str(); - GlobalNames[FullName] = &Die; -} - /// getParentContextString - Walks the metadata parent chain in a language /// specific manner (using the compile unit language) and returns /// it as a string. This is done at the metadata level because DIEs may @@ -1129,16 +989,16 @@ void DwarfUnit::constructTypeDIE(DIE &Buffer, DIDerivedType DTy) { } /// constructSubprogramArguments - Construct function argument DIEs. -void DwarfUnit::constructSubprogramArguments(DIE &Buffer, DIArray Args) { +void DwarfUnit::constructSubprogramArguments(DIE &Buffer, DITypeArray Args) { for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) { - DIDescriptor Ty = Args.getElement(i); - if (Ty.isUnspecifiedParameter()) { + DIType Ty = resolve(Args.getElement(i)); + if (!Ty) { assert(i == N-1 && "Unspecified parameter must be the last argument"); createAndAddDIE(dwarf::DW_TAG_unspecified_parameters, Buffer); } else { DIE &Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, Buffer); - addType(Arg, DIType(Ty)); - if (DIType(Ty).isArtificial()) + addType(Arg, Ty); + if (Ty.isArtificial()) addFlag(Arg, dwarf::DW_AT_artificial); } } @@ -1161,14 +1021,14 @@ void DwarfUnit::constructTypeDIE(DIE &Buffer, DICompositeType CTy) { break; case dwarf::DW_TAG_subroutine_type: { // Add return type. A void return won't have a type. - DIArray Elements = CTy.getTypeArray(); - DIType RTy(Elements.getElement(0)); + DITypeArray Elements = DISubroutineType(CTy).getTypeArray(); + DIType RTy(resolve(Elements.getElement(0))); if (RTy) addType(Buffer, RTy); bool isPrototyped = true; if (Elements.getNumElements() == 2 && - Elements.getElement(1).isUnspecifiedParameter()) + !Elements.getElement(1)) isPrototyped = false; constructSubprogramArguments(Buffer, Elements); @@ -1191,7 +1051,7 @@ void DwarfUnit::constructTypeDIE(DIE &Buffer, DICompositeType CTy) { case dwarf::DW_TAG_union_type: case dwarf::DW_TAG_class_type: { // Add elements to structure type. - DIArray Elements = CTy.getTypeArray(); + DIArray Elements = CTy.getElements(); for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) { DIDescriptor Element = Elements.getElement(i); if (Element.isSubprogram()) @@ -1373,20 +1233,23 @@ DIE *DwarfUnit::getOrCreateNameSpace(DINameSpace NS) { } /// getOrCreateSubprogramDIE - Create new DIE using SP. -DIE *DwarfUnit::getOrCreateSubprogramDIE(DISubprogram SP) { +DIE *DwarfUnit::getOrCreateSubprogramDIE(DISubprogram SP, bool Minimal) { // Construct the context before querying for the existence of the DIE in case // such construction creates the DIE (as is the case for member function // declarations). - DIE *ContextDIE = getOrCreateContextDIE(resolve(SP.getContext())); + DIE *ContextDIE = + Minimal ? &getUnitDie() : getOrCreateContextDIE(resolve(SP.getContext())); if (DIE *SPDie = getDIE(SP)) return SPDie; if (DISubprogram SPDecl = SP.getFunctionDeclaration()) { - // Add subprogram definitions to the CU die directly. - ContextDIE = &getUnitDie(); - // Build the decl now to ensure it precedes the definition. - getOrCreateSubprogramDIE(SPDecl); + if (!Minimal) { + // Add subprogram definitions to the CU die directly. + ContextDIE = &getUnitDie(); + // Build the decl now to ensure it precedes the definition. + getOrCreateSubprogramDIE(SPDecl); + } } // DW_TAG_inlined_subroutine may refer to this DIE. @@ -1401,14 +1264,8 @@ DIE *DwarfUnit::getOrCreateSubprogramDIE(DISubprogram SP) { return &SPDie; } -void DwarfUnit::applySubprogramAttributesToDefinition(DISubprogram SP, DIE &SPDie) { - DISubprogram SPDecl = SP.getFunctionDeclaration(); - DIScope Context = resolve(SPDecl ? SPDecl.getContext() : SP.getContext()); - applySubprogramAttributes(SP, SPDie); - addGlobalName(SP.getName(), SPDie, Context); -} - -void DwarfUnit::applySubprogramAttributes(DISubprogram SP, DIE &SPDie) { +bool DwarfUnit::applySubprogramDefinitionAttributes(DISubprogram SP, + DIE &SPDie) { DIE *DeclDie = nullptr; StringRef DeclLinkageName; if (DISubprogram SPDecl = SP.getFunctionDeclaration()) { @@ -1431,17 +1288,29 @@ void DwarfUnit::applySubprogramAttributes(DISubprogram SP, DIE &SPDie) { addString(SPDie, dwarf::DW_AT_MIPS_linkage_name, GlobalValue::getRealLinkageName(LinkageName)); - if (DeclDie) { - // Refer to the function declaration where all the other attributes will be - // found. - addDIEEntry(SPDie, dwarf::DW_AT_specification, *DeclDie); - return; - } + if (!DeclDie) + return false; + + // Refer to the function declaration where all the other attributes will be + // found. + addDIEEntry(SPDie, dwarf::DW_AT_specification, *DeclDie); + return true; +} + +void DwarfUnit::applySubprogramAttributes(DISubprogram SP, DIE &SPDie, + bool Minimal) { + if (!Minimal) + if (applySubprogramDefinitionAttributes(SP, SPDie)) + return; // Constructors and operators for anonymous aggregates do not have names. if (!SP.getName().empty()) addString(SPDie, dwarf::DW_AT_name, SP.getName()); + // Skip the rest of the attributes under -gmlt to save space. + if (Minimal) + return; + addSourceLine(SPDie, SP); // Add the prototype if we have a prototype and we have a C like @@ -1452,15 +1321,15 @@ void DwarfUnit::applySubprogramAttributes(DISubprogram SP, DIE &SPDie) { Language == dwarf::DW_LANG_ObjC)) addFlag(SPDie, dwarf::DW_AT_prototyped); - DICompositeType SPTy = SP.getType(); + DISubroutineType SPTy = SP.getType(); assert(SPTy.getTag() == dwarf::DW_TAG_subroutine_type && "the type of a subprogram should be a subroutine"); - DIArray Args = SPTy.getTypeArray(); + DITypeArray Args = SPTy.getTypeArray(); // Add a return type. If this is a type like a C/C++ void type we don't add a // return type. - if (Args.getElement(0)) - addType(SPDie, DIType(Args.getElement(0))); + if (resolve(Args.getElement(0))) + addType(SPDie, DIType(resolve(Args.getElement(0)))); unsigned VK = SP.getVirtuality(); if (VK) { @@ -1506,7 +1375,7 @@ void DwarfUnit::applySubprogramAttributes(DISubprogram SP, DIE &SPDie) { else if (SP.isPrivate()) addUInt(SPDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1, dwarf::DW_ACCESS_private); - else + else if (SP.isPublic()) addUInt(SPDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1, dwarf::DW_ACCESS_public); @@ -1514,184 +1383,6 @@ void DwarfUnit::applySubprogramAttributes(DISubprogram SP, DIE &SPDie) { addFlag(SPDie, dwarf::DW_AT_explicit); } -void DwarfUnit::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); -} - -// Return const expression if value is a GEP to access merged global -// constant. e.g. -// i8* getelementptr ({ i8, i8, i8, i8 }* @_MergedGlobals, i32 0, i32 0) -static const ConstantExpr *getMergedGlobalExpr(const Value *V) { - const ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(V); - if (!CE || CE->getNumOperands() != 3 || - CE->getOpcode() != Instruction::GetElementPtr) - return nullptr; - - // First operand points to a global struct. - Value *Ptr = CE->getOperand(0); - if (!isa<GlobalValue>(Ptr) || - !isa<StructType>(cast<PointerType>(Ptr->getType())->getElementType())) - return nullptr; - - // Second operand is zero. - const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CE->getOperand(1)); - if (!CI || !CI->isZero()) - return nullptr; - - // Third operand is offset. - if (!isa<ConstantInt>(CE->getOperand(2))) - return nullptr; - - return CE; -} - -/// createGlobalVariableDIE - create global variable DIE. -void DwarfCompileUnit::createGlobalVariableDIE(DIGlobalVariable GV) { - // Check for pre-existence. - if (getDIE(GV)) - return; - - assert(GV.isGlobalVariable()); - - 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); - - // Add to map. - VariableDIE = &createAndAddDIE(GV.getTag(), *ContextDIE, GV); - - // Add name and type. - addString(*VariableDIE, dwarf::DW_AT_name, GV.getDisplayName()); - addType(*VariableDIE, GTy); - - // Add scoping info. - if (!GV.isLocalToUnit()) - addFlag(*VariableDIE, dwarf::DW_AT_external); - - // Add line number info. - addSourceLine(*VariableDIE, GV); - } - - // Add location. - bool addToAccelTable = false; - DIE *VariableSpecDIE = nullptr; - bool isGlobalVariable = GV.getGlobal() != nullptr; - if (isGlobalVariable) { - addToAccelTable = true; - DIELoc *Loc = new (DIEValueAllocator) DIELoc(); - const MCSymbol *Sym = Asm->getSymbol(GV.getGlobal()); - if (GV.getGlobal()->isThreadLocal()) { - // FIXME: Make this work with -gsplit-dwarf. - unsigned PointerSize = Asm->getDataLayout().getPointerSize(); - assert((PointerSize == 4 || PointerSize == 8) && - "Add support for other sizes if necessary"); - // Based on GCC's support for TLS: - if (!DD->useSplitDwarf()) { - // 1) Start with a constNu of the appropriate pointer size - addUInt(*Loc, dwarf::DW_FORM_data1, - PointerSize == 4 ? dwarf::DW_OP_const4u : dwarf::DW_OP_const8u); - // 2) containing the (relocated) offset of the TLS variable - // within the module's TLS block. - addExpr(*Loc, dwarf::DW_FORM_udata, - Asm->getObjFileLowering().getDebugThreadLocalSymbol(Sym)); - } else { - addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_const_index); - 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); - } else { - DD->addArangeLabel(SymbolCU(this, Sym)); - addOpAddress(*Loc, Sym); - } - // 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); - } - // 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, - 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); - } else if (const ConstantExpr *CE = getMergedGlobalExpr(GV->getOperand(11))) { - addToAccelTable = true; - // GV is a merged global. - DIELoc *Loc = new (DIEValueAllocator) DIELoc(); - Value *Ptr = CE->getOperand(0); - MCSymbol *Sym = Asm->getSymbol(cast<GlobalValue>(Ptr)); - DD->addArangeLabel(SymbolCU(this, Sym)); - addOpAddress(*Loc, Sym); - addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_constu); - SmallVector<Value *, 3> Idx(CE->op_begin() + 1, CE->op_end()); - addUInt(*Loc, dwarf::DW_FORM_udata, - Asm->getDataLayout().getIndexedOffset(Ptr->getType(), Idx)); - addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_plus); - addBlock(*VariableDIE, dwarf::DW_AT_location, Loc); - } - - if (addToAccelTable) { - DIE &AddrDIE = VariableSpecDIE ? *VariableSpecDIE : *VariableDIE; - DD->addAccelName(GV.getName(), AddrDIE); - - // 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(), AddrDIE); - } - - addGlobalName(GV.getName(), VariableSpecDIE ? *VariableSpecDIE : *VariableDIE, - GV.getContext()); -} - /// constructSubrangeDIE - Construct subrange DIE from DISubrange. void DwarfUnit::constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy) { DIE &DW_Subrange = createAndAddDIE(dwarf::DW_TAG_subrange_type, Buffer); @@ -1700,9 +1391,7 @@ void DwarfUnit::constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy) { // The LowerBound value defines the lower bounds which is typically zero for // C/C++. The Count value is the number of elements. Values are 64 bit. If // Count == -1 then the array is unbounded and we do not emit - // DW_AT_lower_bound and DW_AT_upper_bound attributes. If LowerBound == 0 and - // Count == 0, then the array has zero elements in which case we do not emit - // an upper bound. + // DW_AT_lower_bound and DW_AT_count attributes. int64_t LowerBound = SR.getLo(); int64_t DefaultLowerBound = getDefaultLowerBound(); int64_t Count = SR.getCount(); @@ -1710,11 +1399,22 @@ void DwarfUnit::constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy) { if (DefaultLowerBound == -1 || LowerBound != DefaultLowerBound) addUInt(DW_Subrange, dwarf::DW_AT_lower_bound, None, LowerBound); - if (Count != -1 && Count != 0) + if (Count != -1) // FIXME: An unbounded array should reference the expression that defines // the array. - addUInt(DW_Subrange, dwarf::DW_AT_upper_bound, None, - LowerBound + Count - 1); + addUInt(DW_Subrange, dwarf::DW_AT_count, None, Count); +} + +DIE *DwarfUnit::getIndexTyDie() { + if (IndexTyDie) + return IndexTyDie; + // Construct an integer type to use for indexes. + IndexTyDie = &createAndAddDIE(dwarf::DW_TAG_base_type, UnitDie); + addString(*IndexTyDie, dwarf::DW_AT_name, "sizetype"); + addUInt(*IndexTyDie, dwarf::DW_AT_byte_size, None, sizeof(int64_t)); + addUInt(*IndexTyDie, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1, + dwarf::DW_ATE_unsigned); + return IndexTyDie; } /// constructArrayTypeDIE - Construct array type DIE from DICompositeType. @@ -1729,18 +1429,9 @@ void DwarfUnit::constructArrayTypeDIE(DIE &Buffer, DICompositeType CTy) { // FIXME: This type should be passed down from the front end // as different languages may have different sizes for indexes. DIE *IdxTy = getIndexTyDie(); - if (!IdxTy) { - // Construct an integer type to use for indexes. - IdxTy = &createAndAddDIE(dwarf::DW_TAG_base_type, UnitDie); - addString(*IdxTy, dwarf::DW_AT_name, "sizetype"); - addUInt(*IdxTy, dwarf::DW_AT_byte_size, None, sizeof(int64_t)); - addUInt(*IdxTy, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1, - dwarf::DW_ATE_unsigned); - setIndexTyDie(IdxTy); - } // Add subranges to array type. - DIArray Elements = CTy.getTypeArray(); + DIArray Elements = CTy.getElements(); for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) { DIDescriptor Element = Elements.getElement(i); if (Element.getTag() == dwarf::DW_TAG_subrange_type) @@ -1750,7 +1441,7 @@ void DwarfUnit::constructArrayTypeDIE(DIE &Buffer, DICompositeType CTy) { /// constructEnumTypeDIE - Construct an enum type DIE from DICompositeType. void DwarfUnit::constructEnumTypeDIE(DIE &Buffer, DICompositeType CTy) { - DIArray Elements = CTy.getTypeArray(); + DIArray Elements = CTy.getElements(); // Add enumerators to enumeration type. for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) { @@ -1788,68 +1479,6 @@ void DwarfUnit::constructContainingTypeDIEs() { } } -/// constructVariableDIE - Construct a DIE for the given DbgVariable. -std::unique_ptr<DIE> DwarfUnit::constructVariableDIE(DbgVariable &DV, - bool Abstract) { - auto D = constructVariableDIEImpl(DV, Abstract); - DV.setDIE(*D); - return D; -} - -std::unique_ptr<DIE> DwarfUnit::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() == 3); - 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. - int FI = DV.getFrameIndex(); - if (FI != ~0) { - unsigned FrameReg = 0; - const TargetFrameLowering *TFI = Asm->TM.getFrameLowering(); - int Offset = TFI->getFrameIndexReference(*Asm->MF, FI, FrameReg); - MachineLocation Location(FrameReg, Offset); - addVariableAddress(DV, *VariableDie, Location); - } - - return VariableDie; -} - /// constructMemberDIE - Construct member DIE from DIDerivedType. void DwarfUnit::constructMemberDIE(DIE &Buffer, DIDerivedType DT) { DIE &MemberDie = createAndAddDIE(DT.getTag(), Buffer); @@ -1922,7 +1551,7 @@ void DwarfUnit::constructMemberDIE(DIE &Buffer, DIDerivedType DT) { addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1, dwarf::DW_ACCESS_private); // Otherwise C++ member and base classes are considered public. - else + else if (DT.isPublic()) addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1, dwarf::DW_ACCESS_public); if (DT.isVirtual()) @@ -1971,7 +1600,7 @@ DIE *DwarfUnit::getOrCreateStaticMemberDIE(DIDerivedType DT) { else if (DT.isPrivate()) addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1, dwarf::DW_ACCESS_private); - else + else if (DT.isPublic()) addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1, dwarf::DW_ACCESS_public); @@ -1984,6 +1613,10 @@ DIE *DwarfUnit::getOrCreateStaticMemberDIE(DIDerivedType DT) { } void DwarfUnit::emitHeader(const MCSymbol *ASectionSym) const { + // Emit size of content not including length itself + Asm->OutStreamer.AddComment("Length of Unit"); + Asm->EmitInt32(getHeaderSize() + UnitDie.getSize()); + Asm->OutStreamer.AddComment("DWARF version number"); Asm->EmitInt16(DD->getDwarfVersion()); Asm->OutStreamer.AddComment("Offset Into Abbrev. Section"); @@ -1999,50 +1632,9 @@ void DwarfUnit::emitHeader(const MCSymbol *ASectionSym) const { Asm->EmitInt8(Asm->getDataLayout().getPointerSize()); } -void DwarfUnit::addRange(RangeSpan Range) { - // Only add a range for this unit if we're emitting full debug. - if (getCUNode().getEmissionKind() == DIBuilder::FullDebug) { - // If we have no current ranges just add the range and return, otherwise, - // check the current section and CU against the previous section and CU we - // emitted into and the subprogram was contained within. If these are the - // same then extend our current range, otherwise add this as a new range. - if (CURanges.size() == 0 || - this != DD->getPrevCU() || - Asm->getCurrentSection() != DD->getPrevSection()) { - CURanges.push_back(Range); - return; - } - - assert(&(CURanges.back().getEnd()->getSection()) == - &(Range.getEnd()->getSection()) && - "We can only append to a range in the same section!"); - CURanges.back().setEnd(Range.getEnd()); - } -} - -void DwarfCompileUnit::initStmtList(MCSymbol *DwarfLineSectionSym) { - // Define start line table label for each Compile Unit. - MCSymbol *LineTableStartSym = - Asm->OutStreamer.getDwarfLineTableSymbol(getUniqueID()); - - stmtListIndex = UnitDie.getValues().size(); - - // DW_AT_stmt_list is a offset of line number information for this - // compile unit in debug_line section. For split dwarf this is - // 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); -} - -void DwarfCompileUnit::applyStmtList(DIE &D) { - D.addValue(dwarf::DW_AT_stmt_list, - UnitDie.getAbbrev().getData()[stmtListIndex].getForm(), - UnitDie.getValues()[stmtListIndex]); +void DwarfUnit::initSection(const MCSection *Section) { + assert(!this->Section); + this->Section = Section; } void DwarfTypeUnit::emitHeader(const MCSymbol *ASectionSym) const { @@ -2055,16 +1647,8 @@ void DwarfTypeUnit::emitHeader(const MCSymbol *ASectionSym) const { sizeof(Ty->getOffset())); } -void DwarfTypeUnit::initSection(const MCSection *Section) { - assert(!this->Section); - this->Section = Section; - // Since each type unit is contained in its own COMDAT section, the begin - // label and the section label are the same. Using the begin label emission in - // DwarfDebug to emit the section label as well is slightly subtle/sneaky, but - // the only other alternative of lazily constructing start-of-section labels - // and storing a mapping in DwarfDebug (or AsmPrinter). - this->SectionSym = this->LabelBegin = - Asm->GetTempSymbol(Section->getLabelBeginName(), getUniqueID()); - this->LabelEnd = - Asm->GetTempSymbol(Section->getLabelEndName(), getUniqueID()); +bool DwarfTypeUnit::isDwoUnit() const { + // Since there are no skeleton type units, all type units are dwo type units + // when split DWARF is being used. + return DD->useSplitDwarf(); } |