index 2139ffcd71cf0209294b02b1791a16d7d7d8a36f..e3205466a2e96c206483fe6d3471b83158690bb2 100644 (file)
//===----------------------------------------------------------------------===//
#include "DwarfUnit.h"
+
#include "DwarfAccelTable.h"
+#include "DwarfCompileUnit.h"
#include "DwarfDebug.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/IR/Constants.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
using namespace llvm;
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)
/// 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);
}
/// 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));
/// 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);
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,
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);
}
}
-/// 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);
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.
+bool 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;
Idx = RI->getSubRegIndex(*SR, Reg);
}
- if (DWReg < 0) {
- DEBUG(dbgs() << "Invalid Dwarf register number.\n");
- addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_nop);
- return;
- }
+ if (DWReg < 0)
+ return false;
- // Emit register
+ // Emit register.
if (DWReg < 32)
addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + DWReg);
else {
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);
}
}
+ return true;
}
/// addRegisterOffset - Add register offset.
-void DwarfUnit::addRegisterOffset(DIELoc &TheDie, unsigned Reg,
+bool DwarfUnit::addRegisterOffset(DIELoc &TheDie, unsigned Reg,
int64_t Offset) {
- const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
- unsigned DWReg = RI->getDwarfRegNum(Reg, false);
- const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
+ const TargetRegisterInfo *TRI = Asm->TM.getSubtargetImpl()->getRegisterInfo();
+ int DWReg = TRI->getDwarfRegNum(Reg, false);
+ if (DWReg < 0)
+ return false;
+
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);
addUInt(TheDie, dwarf::DW_FORM_udata, DWReg);
}
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);
+ return true;
}
/* Byref variables, in Blocks, are declared by the programmer as "SomeType
// variable's location.
DIELoc *Loc = new (DIEValueAllocator) DIELoc();
+ bool validReg;
if (Location.isReg())
- addRegisterOp(*Loc, Location.getReg());
+ validReg = addRegisterOpPiece(*Loc, Location.getReg());
else
- addRegisterOffset(*Loc, Location.getReg(), Location.getOffset());
+ validReg = addRegisterOffset(*Loc, Location.getReg(), Location.getOffset());
+
+ if (!validReg)
+ return;
// If we started with a pointer to the __Block_byref... struct, then
// the first thing we need to do is dereference the pointer (DW_OP_deref).
dwarf::Tag T = (dwarf::Tag)Ty.getTag();
// Encode pointer constants as unsigned bytes. This is used at least for
// null pointer constant emission.
+ // (Pieces of) aggregate types that get hacked apart by SROA may also be
+ // represented by a constant. Encode them as unsigned bytes.
// FIXME: reference and rvalue_reference /probably/ shouldn't be allowed
// here, but accept them for now due to a bug in SROA producing bogus
// dbg.values.
- if (T == dwarf::DW_TAG_pointer_type ||
+ if (T == dwarf::DW_TAG_array_type ||
+ T == dwarf::DW_TAG_class_type ||
+ T == dwarf::DW_TAG_pointer_type ||
T == dwarf::DW_TAG_ptr_to_member_type ||
T == dwarf::DW_TAG_reference_type ||
- T == dwarf::DW_TAG_rvalue_reference_type)
+ T == dwarf::DW_TAG_rvalue_reference_type ||
+ T == dwarf::DW_TAG_structure_type)
return true;
assert(T == dwarf::DW_TAG_typedef || T == dwarf::DW_TAG_const_type ||
T == dwarf::DW_TAG_volatile_type ||
Encoding == dwarf::DW_ATE_unsigned_char ||
Encoding == dwarf::DW_ATE_signed ||
Encoding == dwarf::DW_ATE_signed_char ||
- Encoding == dwarf::DW_ATE_UTF || Encoding == dwarf::DW_ATE_boolean) &&
+ Encoding == dwarf::DW_ATE_UTF || Encoding == dwarf::DW_ATE_boolean ||
+ (Ty.getTag() == dwarf::DW_TAG_unspecified_type &&
+ Ty.getName() == "decltype(nullptr)")) &&
"Unsupported encoding");
return (Encoding == dwarf::DW_ATE_unsigned ||
Encoding == dwarf::DW_ATE_unsigned_char ||
- Encoding == dwarf::DW_ATE_UTF || Encoding == dwarf::DW_ATE_boolean);
+ Encoding == dwarf::DW_ATE_UTF || Encoding == dwarf::DW_ATE_boolean ||
+ Ty.getTag() == dwarf::DW_TAG_unspecified_type);
}
/// If this type is derived from a base type then return base type size.
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);
}
}
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
addString(Buffer, dwarf::DW_AT_name, Name);
// Add size if non-zero (derived types might be zero-sized.)
- if (Size && Tag != dwarf::DW_TAG_pointer_type)
+ if (Size && Tag != dwarf::DW_TAG_pointer_type
+ && Tag != dwarf::DW_TAG_ptr_to_member_type)
addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);
if (Tag == dwarf::DW_TAG_ptr_to_member_type)
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);
}
}
if (CTy.isAppleBlockExtension())
addFlag(Buffer, dwarf::DW_AT_APPLE_block);
+ // This is outside the DWARF spec, but GDB expects a DW_AT_containing_type
+ // inside C++ composite types to point to the base class with the vtable.
DICompositeType ContainingType(resolve(CTy.getContainingType()));
if (ContainingType)
addDIEEntry(Buffer, dwarf::DW_AT_containing_type,
addType(ParamDIE, resolve(VP.getType()));
if (!VP.getName().empty())
addString(ParamDIE, dwarf::DW_AT_name, VP.getName());
- if (Value *Val = VP.getValue()) {
- if (ConstantInt *CI = dyn_cast<ConstantInt>(Val))
+ if (Metadata *Val = VP.getValue()) {
+ if (ConstantInt *CI = mdconst::dyn_extract<ConstantInt>(Val))
addConstantValue(ParamDIE, CI, resolve(VP.getType()));
- else if (GlobalValue *GV = dyn_cast<GlobalValue>(Val)) {
+ else if (GlobalValue *GV = mdconst::dyn_extract<GlobalValue>(Val)) {
// For declaration non-type template parameters (such as global values and
// functions)
DIELoc *Loc = new (DIEValueAllocator) DIELoc();
}
/// 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.
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()) {
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
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);
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 +1407,7 @@ 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 +1415,22 @@ 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.
// 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.getElements();
}
}
-/// 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);
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())
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);
}
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");
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 {
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();
}