2014-10-04 15:49:50 +00:00
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#include "DwarfCompileUnit.h"
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2014-10-04 16:24:00 +00:00
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#include "llvm/CodeGen/MachineFunction.h"
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2014-10-04 15:49:50 +00:00
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/GlobalValue.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/Instruction.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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2014-10-04 16:24:00 +00:00
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetSubtargetInfo.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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2014-10-04 15:49:50 +00:00
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namespace llvm {
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DwarfCompileUnit::DwarfCompileUnit(unsigned UID, DICompileUnit Node,
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AsmPrinter *A, DwarfDebug *DW,
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DwarfFile *DWU)
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: DwarfUnit(UID, dwarf::DW_TAG_compile_unit, Node, A, DW, DWU) {
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insertDIE(Node, &getUnitDie());
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}
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/// addLabelAddress - Add a dwarf label attribute data and value using
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/// DW_FORM_addr or DW_FORM_GNU_addr_index.
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///
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void DwarfCompileUnit::addLabelAddress(DIE &Die, dwarf::Attribute Attribute,
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const MCSymbol *Label) {
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// Don't use the address pool in non-fission or in the skeleton unit itself.
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// FIXME: Once GDB supports this, it's probably worthwhile using the address
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// pool from the skeleton - maybe even in non-fission (possibly fewer
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// relocations by sharing them in the pool, but we have other ideas about how
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// to reduce the number of relocations as well/instead).
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if (!DD->useSplitDwarf() || !Skeleton)
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return addLocalLabelAddress(Die, Attribute, Label);
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if (Label)
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DD->addArangeLabel(SymbolCU(this, Label));
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unsigned idx = DD->getAddressPool().getIndex(Label);
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DIEValue *Value = new (DIEValueAllocator) DIEInteger(idx);
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Die.addValue(Attribute, dwarf::DW_FORM_GNU_addr_index, Value);
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}
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void DwarfCompileUnit::addLocalLabelAddress(DIE &Die,
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dwarf::Attribute Attribute,
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const MCSymbol *Label) {
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if (Label)
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DD->addArangeLabel(SymbolCU(this, Label));
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Die.addValue(Attribute, dwarf::DW_FORM_addr,
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Label ? (DIEValue *)new (DIEValueAllocator) DIELabel(Label)
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: new (DIEValueAllocator) DIEInteger(0));
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}
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2014-10-04 16:00:26 +00:00
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unsigned DwarfCompileUnit::getOrCreateSourceID(StringRef FileName,
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StringRef DirName) {
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2014-10-04 15:49:50 +00:00
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// If we print assembly, we can't separate .file entries according to
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// compile units. Thus all files will belong to the default compile unit.
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// FIXME: add a better feature test than hasRawTextSupport. Even better,
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// extend .file to support this.
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return Asm->OutStreamer.EmitDwarfFileDirective(
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0, DirName, FileName,
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Asm->OutStreamer.hasRawTextSupport() ? 0 : getUniqueID());
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}
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// Return const expression if value is a GEP to access merged global
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// constant. e.g.
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// i8* getelementptr ({ i8, i8, i8, i8 }* @_MergedGlobals, i32 0, i32 0)
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static const ConstantExpr *getMergedGlobalExpr(const Value *V) {
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const ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(V);
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if (!CE || CE->getNumOperands() != 3 ||
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CE->getOpcode() != Instruction::GetElementPtr)
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return nullptr;
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// First operand points to a global struct.
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Value *Ptr = CE->getOperand(0);
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if (!isa<GlobalValue>(Ptr) ||
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!isa<StructType>(cast<PointerType>(Ptr->getType())->getElementType()))
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return nullptr;
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// Second operand is zero.
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const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CE->getOperand(1));
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if (!CI || !CI->isZero())
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return nullptr;
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// Third operand is offset.
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if (!isa<ConstantInt>(CE->getOperand(2)))
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return nullptr;
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return CE;
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}
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/// getOrCreateGlobalVariableDIE - get or create global variable DIE.
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DIE *DwarfCompileUnit::getOrCreateGlobalVariableDIE(DIGlobalVariable GV) {
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// Check for pre-existence.
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if (DIE *Die = getDIE(GV))
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return Die;
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assert(GV.isGlobalVariable());
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DIScope GVContext = GV.getContext();
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DIType GTy = DD->resolve(GV.getType());
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// If this is a static data member definition, some attributes belong
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// to the declaration DIE.
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DIE *VariableDIE = nullptr;
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bool IsStaticMember = false;
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DIDerivedType SDMDecl = GV.getStaticDataMemberDeclaration();
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if (SDMDecl.Verify()) {
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assert(SDMDecl.isStaticMember() && "Expected static member decl");
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// We need the declaration DIE that is in the static member's class.
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VariableDIE = getOrCreateStaticMemberDIE(SDMDecl);
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IsStaticMember = true;
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}
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// If this is not a static data member definition, create the variable
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// DIE and add the initial set of attributes to it.
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if (!VariableDIE) {
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// Construct the context before querying for the existence of the DIE in
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// case such construction creates the DIE.
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DIE *ContextDIE = getOrCreateContextDIE(GVContext);
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// Add to map.
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VariableDIE = &createAndAddDIE(GV.getTag(), *ContextDIE, GV);
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// Add name and type.
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addString(*VariableDIE, dwarf::DW_AT_name, GV.getDisplayName());
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addType(*VariableDIE, GTy);
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// Add scoping info.
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if (!GV.isLocalToUnit())
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addFlag(*VariableDIE, dwarf::DW_AT_external);
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// Add line number info.
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addSourceLine(*VariableDIE, GV);
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}
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// Add location.
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bool addToAccelTable = false;
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DIE *VariableSpecDIE = nullptr;
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bool isGlobalVariable = GV.getGlobal() != nullptr;
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if (isGlobalVariable) {
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addToAccelTable = true;
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DIELoc *Loc = new (DIEValueAllocator) DIELoc();
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const MCSymbol *Sym = Asm->getSymbol(GV.getGlobal());
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if (GV.getGlobal()->isThreadLocal()) {
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// FIXME: Make this work with -gsplit-dwarf.
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unsigned PointerSize = Asm->getDataLayout().getPointerSize();
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assert((PointerSize == 4 || PointerSize == 8) &&
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"Add support for other sizes if necessary");
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// Based on GCC's support for TLS:
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if (!DD->useSplitDwarf()) {
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// 1) Start with a constNu of the appropriate pointer size
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addUInt(*Loc, dwarf::DW_FORM_data1,
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PointerSize == 4 ? dwarf::DW_OP_const4u : dwarf::DW_OP_const8u);
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// 2) containing the (relocated) offset of the TLS variable
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// within the module's TLS block.
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addExpr(*Loc, dwarf::DW_FORM_udata,
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Asm->getObjFileLowering().getDebugThreadLocalSymbol(Sym));
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} else {
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addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_const_index);
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addUInt(*Loc, dwarf::DW_FORM_udata,
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DD->getAddressPool().getIndex(Sym, /* TLS */ true));
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}
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// 3) followed by a custom OP to make the debugger do a TLS lookup.
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addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_push_tls_address);
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} else {
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DD->addArangeLabel(SymbolCU(this, Sym));
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addOpAddress(*Loc, Sym);
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}
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// A static member's declaration is already flagged as such.
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if (!SDMDecl.Verify() && !GV.isDefinition())
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addFlag(*VariableDIE, dwarf::DW_AT_declaration);
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// Do not create specification DIE if context is either compile unit
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// or a subprogram.
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if (GVContext && GV.isDefinition() && !GVContext.isCompileUnit() &&
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!GVContext.isFile() && !DD->isSubprogramContext(GVContext)) {
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// Create specification DIE.
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VariableSpecDIE = &createAndAddDIE(dwarf::DW_TAG_variable, UnitDie);
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addDIEEntry(*VariableSpecDIE, dwarf::DW_AT_specification, *VariableDIE);
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addBlock(*VariableSpecDIE, dwarf::DW_AT_location, Loc);
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// A static member's declaration is already flagged as such.
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if (!SDMDecl.Verify())
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addFlag(*VariableDIE, dwarf::DW_AT_declaration);
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} else {
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addBlock(*VariableDIE, dwarf::DW_AT_location, Loc);
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}
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// Add the linkage name.
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StringRef LinkageName = GV.getLinkageName();
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if (!LinkageName.empty())
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// From DWARF4: DIEs to which DW_AT_linkage_name may apply include:
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// TAG_common_block, TAG_constant, TAG_entry_point, TAG_subprogram and
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// TAG_variable.
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addString(IsStaticMember && VariableSpecDIE ? *VariableSpecDIE
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: *VariableDIE,
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DD->getDwarfVersion() >= 4 ? dwarf::DW_AT_linkage_name
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: dwarf::DW_AT_MIPS_linkage_name,
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GlobalValue::getRealLinkageName(LinkageName));
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} else if (const ConstantInt *CI =
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dyn_cast_or_null<ConstantInt>(GV.getConstant())) {
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// AT_const_value was added when the static member was created. To avoid
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// emitting AT_const_value multiple times, we only add AT_const_value when
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// it is not a static member.
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if (!IsStaticMember)
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addConstantValue(*VariableDIE, CI, GTy);
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} else if (const ConstantExpr *CE = getMergedGlobalExpr(GV.getConstant())) {
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addToAccelTable = true;
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// GV is a merged global.
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DIELoc *Loc = new (DIEValueAllocator) DIELoc();
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Value *Ptr = CE->getOperand(0);
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MCSymbol *Sym = Asm->getSymbol(cast<GlobalValue>(Ptr));
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DD->addArangeLabel(SymbolCU(this, Sym));
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addOpAddress(*Loc, Sym);
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addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
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SmallVector<Value *, 3> Idx(CE->op_begin() + 1, CE->op_end());
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addUInt(*Loc, dwarf::DW_FORM_udata,
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Asm->getDataLayout().getIndexedOffset(Ptr->getType(), Idx));
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addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
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addBlock(*VariableDIE, dwarf::DW_AT_location, Loc);
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}
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DIE *ResultDIE = VariableSpecDIE ? VariableSpecDIE : VariableDIE;
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if (addToAccelTable) {
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DD->addAccelName(GV.getName(), *ResultDIE);
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// If the linkage name is different than the name, go ahead and output
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// that as well into the name table.
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if (GV.getLinkageName() != "" && GV.getName() != GV.getLinkageName())
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DD->addAccelName(GV.getLinkageName(), *ResultDIE);
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}
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addGlobalName(GV.getName(), *ResultDIE, GV.getContext());
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return ResultDIE;
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}
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void DwarfCompileUnit::addRange(RangeSpan Range) {
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bool SameAsPrevCU = this == DD->getPrevCU();
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DD->setPrevCU(this);
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// If we have no current ranges just add the range and return, otherwise,
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// check the current section and CU against the previous section and CU we
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// emitted into and the subprogram was contained within. If these are the
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// same then extend our current range, otherwise add this as a new range.
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if (CURanges.empty() || !SameAsPrevCU ||
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(&CURanges.back().getEnd()->getSection() !=
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&Range.getEnd()->getSection())) {
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CURanges.push_back(Range);
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return;
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}
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CURanges.back().setEnd(Range.getEnd());
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}
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2014-10-08 22:46:27 +00:00
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void DwarfCompileUnit::addSectionLabel(DIE &Die, dwarf::Attribute Attribute,
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const MCSymbol *Label,
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const MCSymbol *Sec) {
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if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
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addLabel(Die, Attribute,
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DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
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: dwarf::DW_FORM_data4,
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Label);
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else
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addSectionDelta(Die, Attribute, Label, Sec);
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}
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2014-10-04 15:49:50 +00:00
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void DwarfCompileUnit::initStmtList(MCSymbol *DwarfLineSectionSym) {
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// Define start line table label for each Compile Unit.
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MCSymbol *LineTableStartSym =
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Asm->OutStreamer.getDwarfLineTableSymbol(getUniqueID());
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stmtListIndex = UnitDie.getValues().size();
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// DW_AT_stmt_list is a offset of line number information for this
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// compile unit in debug_line section. For split dwarf this is
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// left in the skeleton CU and so not included.
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// The line table entries are not always emitted in assembly, so it
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// is not okay to use line_table_start here.
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2014-10-08 22:46:27 +00:00
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addSectionLabel(UnitDie, dwarf::DW_AT_stmt_list, LineTableStartSym,
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DwarfLineSectionSym);
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2014-10-04 15:49:50 +00:00
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}
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void DwarfCompileUnit::applyStmtList(DIE &D) {
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D.addValue(dwarf::DW_AT_stmt_list,
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UnitDie.getAbbrev().getData()[stmtListIndex].getForm(),
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UnitDie.getValues()[stmtListIndex]);
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}
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2014-10-04 15:58:47 +00:00
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void DwarfCompileUnit::attachLowHighPC(DIE &D, const MCSymbol *Begin,
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const MCSymbol *End) {
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assert(Begin && "Begin label should not be null!");
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assert(End && "End label should not be null!");
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assert(Begin->isDefined() && "Invalid starting label");
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assert(End->isDefined() && "Invalid end label");
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addLabelAddress(D, dwarf::DW_AT_low_pc, Begin);
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if (DD->getDwarfVersion() < 4)
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addLabelAddress(D, dwarf::DW_AT_high_pc, End);
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else
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addLabelDelta(D, dwarf::DW_AT_high_pc, End, Begin);
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}
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2014-10-04 16:24:00 +00:00
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// Find DIE for the given subprogram and attach appropriate DW_AT_low_pc
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// and DW_AT_high_pc attributes. If there are global variables in this
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// scope then create and insert DIEs for these variables.
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DIE &DwarfCompileUnit::updateSubprogramScopeDIE(DISubprogram SP) {
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DIE *SPDie = getOrCreateSubprogramDIE(SP);
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attachLowHighPC(*SPDie, DD->getFunctionBeginSym(), DD->getFunctionEndSym());
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if (!DD->getCurrentFunction()->getTarget().Options.DisableFramePointerElim(
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*DD->getCurrentFunction()))
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addFlag(*SPDie, dwarf::DW_AT_APPLE_omit_frame_ptr);
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// Only include DW_AT_frame_base in full debug info
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if (getCUNode().getEmissionKind() != DIBuilder::LineTablesOnly) {
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const TargetRegisterInfo *RI =
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Asm->TM.getSubtargetImpl()->getRegisterInfo();
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MachineLocation Location(RI->getFrameRegister(*Asm->MF));
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addAddress(*SPDie, dwarf::DW_AT_frame_base, Location);
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}
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// Add name to the name table, we do this here because we're guaranteed
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// to have concrete versions of our DW_TAG_subprogram nodes.
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DD->addSubprogramNames(SP, *SPDie);
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return *SPDie;
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|
}
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|
2014-10-08 22:20:02 +00:00
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|
// Construct a DIE for this scope.
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|
|
void DwarfCompileUnit::constructScopeDIE(
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LexicalScope *Scope, SmallVectorImpl<std::unique_ptr<DIE>> &FinalChildren) {
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|
|
|
if (!Scope || !Scope->getScopeNode())
|
|
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|
return;
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|
|
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|
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|
DIScope DS(Scope->getScopeNode());
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|
|
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|
|
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|
assert((Scope->getInlinedAt() || !DS.isSubprogram()) &&
|
|
|
|
"Only handle inlined subprograms here, use "
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|
|
|
"constructSubprogramScopeDIE for non-inlined "
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|
|
|
"subprograms");
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|
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|
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 = DD->constructInlinedScopeDIE(*this, Scope);
|
|
|
|
if (!ScopeDIE)
|
|
|
|
return;
|
|
|
|
// We create children when the scope DIE is not null.
|
|
|
|
DD->createScopeChildrenDIE(*this, 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.
|
|
|
|
DD->createScopeChildrenDIE(*this, Scope, Children, &ChildScopeCount);
|
|
|
|
|
|
|
|
// 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 = DD->constructLexicalScopeDIE(*this, 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));
|
|
|
|
}
|
|
|
|
|
2014-10-04 15:49:50 +00:00
|
|
|
} // end llvm namespace
|