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8647dc910a
This flag is unnecessary for testing because we can get the coverage we need by adjusting CU attributes. Differential Revision: https://reviews.llvm.org/D37725 llvm-svn: 313079
910 lines
34 KiB
C++
910 lines
34 KiB
C++
//===- llvm/CodeGen/DwarfCompileUnit.cpp - Dwarf Compile Units ------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains support for constructing a dwarf compile unit.
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//
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//===----------------------------------------------------------------------===//
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#include "DwarfCompileUnit.h"
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#include "AddressPool.h"
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#include "DwarfDebug.h"
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#include "DwarfExpression.h"
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#include "DwarfUnit.h"
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#include "llvm/ADT/None.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/BinaryFormat/Dwarf.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/DIE.h"
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#include "llvm/CodeGen/LexicalScopes.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/MachineOperand.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/DebugInfo.h"
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#include "llvm/IR/DebugInfoMetadata.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/MC/MachineLocation.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Target/TargetFrameLowering.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/Target/TargetSubtargetInfo.h"
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#include <algorithm>
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#include <cassert>
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#include <cstdint>
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#include <iterator>
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#include <memory>
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#include <string>
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#include <utility>
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using namespace llvm;
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DwarfCompileUnit::DwarfCompileUnit(unsigned UID, const DICompileUnit *Node,
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AsmPrinter *A, DwarfDebug *DW,
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DwarfFile *DWU)
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: DwarfUnit(dwarf::DW_TAG_compile_unit, Node, A, DW, DWU), UniqueID(UID) {
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insertDIE(Node, &getUnitDie());
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MacroLabelBegin = Asm->createTempSymbol("cu_macro_begin");
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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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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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Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_GNU_addr_index,
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DIEInteger(idx));
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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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if (Label)
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Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_addr,
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DIELabel(Label));
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else
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Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_addr,
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DIEInteger(0));
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}
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unsigned DwarfCompileUnit::getOrCreateSourceID(StringRef FileName,
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StringRef DirName) {
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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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DIE *DwarfCompileUnit::getOrCreateGlobalVariableDIE(
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const DIGlobalVariable *GV, ArrayRef<GlobalExpr> GlobalExprs) {
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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);
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auto *GVContext = GV->getScope();
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auto *GTy = DD->resolve(GV->getType());
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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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DIE *VariableDIE = &createAndAddDIE(GV->getTag(), *ContextDIE, GV);
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DIScope *DeclContext;
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if (auto *SDMDecl = GV->getStaticDataMemberDeclaration()) {
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DeclContext = resolve(SDMDecl->getScope());
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assert(SDMDecl->isStaticMember() && "Expected static member decl");
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assert(GV->isDefinition());
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// We need the declaration DIE that is in the static member's class.
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DIE *VariableSpecDIE = getOrCreateStaticMemberDIE(SDMDecl);
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addDIEEntry(*VariableDIE, dwarf::DW_AT_specification, *VariableSpecDIE);
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// If the global variable's type is different from the one in the class
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// member type, assume that it's more specific and also emit it.
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if (GTy != DD->resolve(SDMDecl->getBaseType()))
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addType(*VariableDIE, GTy);
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} else {
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DeclContext = GV->getScope();
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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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if (!GV->isDefinition())
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addFlag(*VariableDIE, dwarf::DW_AT_declaration);
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else
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addGlobalName(GV->getName(), *VariableDIE, DeclContext);
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if (uint32_t AlignInBytes = GV->getAlignInBytes())
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addUInt(*VariableDIE, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
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AlignInBytes);
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// Add location.
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bool addToAccelTable = false;
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DIELoc *Loc = nullptr;
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std::unique_ptr<DIEDwarfExpression> DwarfExpr;
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for (const auto &GE : GlobalExprs) {
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const GlobalVariable *Global = GE.Var;
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const DIExpression *Expr = GE.Expr;
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// For compatibility with DWARF 3 and earlier,
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// DW_AT_location(DW_OP_constu, X, DW_OP_stack_value) becomes
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// DW_AT_const_value(X).
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if (GlobalExprs.size() == 1 && Expr && Expr->isConstant()) {
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addToAccelTable = true;
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addConstantValue(*VariableDIE, /*Unsigned=*/true, Expr->getElement(1));
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break;
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}
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// We cannot describe the location of dllimport'd variables: the
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// computation of their address requires loads from the IAT.
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if (Global && Global->hasDLLImportStorageClass())
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continue;
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// Nothing to describe without address or constant.
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if (!Global && (!Expr || !Expr->isConstant()))
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continue;
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if (!Loc) {
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addToAccelTable = true;
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Loc = new (DIEValueAllocator) DIELoc;
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DwarfExpr = llvm::make_unique<DIEDwarfExpression>(*Asm, *this, *Loc);
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}
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if (Global) {
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const MCSymbol *Sym = Asm->getSymbol(Global);
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if (Global->isThreadLocal()) {
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if (Asm->TM.Options.EmulatedTLS) {
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// TODO: add debug info for emulated thread local mode.
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} else {
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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
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: 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 an OP to make the debugger do a TLS lookup.
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addUInt(*Loc, dwarf::DW_FORM_data1,
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DD->useGNUTLSOpcode() ? dwarf::DW_OP_GNU_push_tls_address
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: dwarf::DW_OP_form_tls_address);
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}
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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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}
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if (Expr) {
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DwarfExpr->addFragmentOffset(Expr);
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DwarfExpr->addExpression(Expr);
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}
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}
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if (Loc)
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addBlock(*VariableDIE, dwarf::DW_AT_location, DwarfExpr->finalize());
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if (DD->useAllLinkageNames())
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addLinkageName(*VariableDIE, GV->getLinkageName());
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if (addToAccelTable) {
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DD->addAccelName(GV->getName(), *VariableDIE);
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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(), *VariableDIE);
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}
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return VariableDIE;
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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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void DwarfCompileUnit::initStmtList() {
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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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// 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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const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
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StmtListValue =
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addSectionLabel(getUnitDie(), dwarf::DW_AT_stmt_list, LineTableStartSym,
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TLOF.getDwarfLineSection()->getBeginSymbol());
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}
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void DwarfCompileUnit::applyStmtList(DIE &D) {
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D.addValue(DIEValueAllocator, *StmtListValue);
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}
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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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// 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(const DISubprogram *SP) {
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DIE *SPDie = getOrCreateSubprogramDIE(SP, includeMinimalInlineScopes());
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attachLowHighPC(*SPDie, Asm->getFunctionBegin(), Asm->getFunctionEnd());
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if (DD->useAppleExtensionAttributes() &&
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!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 (!includeMinimalInlineScopes()) {
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const TargetRegisterInfo *RI = Asm->MF->getSubtarget().getRegisterInfo();
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MachineLocation Location(RI->getFrameRegister(*Asm->MF));
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if (RI->isPhysicalRegister(Location.getReg()))
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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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// Construct a DIE for this scope.
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void DwarfCompileUnit::constructScopeDIE(
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LexicalScope *Scope, SmallVectorImpl<DIE *> &FinalChildren) {
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if (!Scope || !Scope->getScopeNode())
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return;
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auto *DS = Scope->getScopeNode();
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assert((Scope->getInlinedAt() || !isa<DISubprogram>(DS)) &&
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"Only handle inlined subprograms here, use "
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"constructSubprogramScopeDIE for non-inlined "
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"subprograms");
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SmallVector<DIE *, 8> Children;
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// We try to create the scope DIE first, then the children DIEs. This will
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// avoid creating un-used children then removing them later when we find out
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// the scope DIE is null.
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DIE *ScopeDIE;
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if (Scope->getParent() && isa<DISubprogram>(DS)) {
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ScopeDIE = constructInlinedScopeDIE(Scope);
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if (!ScopeDIE)
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return;
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// We create children when the scope DIE is not null.
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createScopeChildrenDIE(Scope, Children);
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} else {
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// Early exit when we know the scope DIE is going to be null.
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if (DD->isLexicalScopeDIENull(Scope))
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return;
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bool HasNonScopeChildren = false;
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// We create children here when we know the scope DIE is not going to be
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// null and the children will be added to the scope DIE.
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createScopeChildrenDIE(Scope, Children, &HasNonScopeChildren);
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// If there are only other scopes as children, put them directly in the
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// parent instead, as this scope would serve no purpose.
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if (!HasNonScopeChildren) {
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FinalChildren.insert(FinalChildren.end(),
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std::make_move_iterator(Children.begin()),
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std::make_move_iterator(Children.end()));
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return;
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}
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ScopeDIE = constructLexicalScopeDIE(Scope);
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assert(ScopeDIE && "Scope DIE should not be null.");
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}
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// Add children
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for (auto &I : Children)
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ScopeDIE->addChild(std::move(I));
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FinalChildren.push_back(std::move(ScopeDIE));
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}
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void DwarfCompileUnit::addScopeRangeList(DIE &ScopeDIE,
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SmallVector<RangeSpan, 2> Range) {
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const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
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// Emit offset in .debug_range as a relocatable label. emitDIE will handle
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// emitting it appropriately.
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const MCSymbol *RangeSectionSym =
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TLOF.getDwarfRangesSection()->getBeginSymbol();
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RangeSpanList List(Asm->createTempSymbol("debug_ranges"), std::move(Range));
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// Under fission, ranges are specified by constant offsets relative to the
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// CU's DW_AT_GNU_ranges_base.
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if (isDwoUnit())
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addSectionDelta(ScopeDIE, dwarf::DW_AT_ranges, List.getSym(),
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RangeSectionSym);
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else
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addSectionLabel(ScopeDIE, dwarf::DW_AT_ranges, List.getSym(),
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RangeSectionSym);
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// Add the range list to the set of ranges to be emitted.
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(Skeleton ? Skeleton : this)->CURangeLists.push_back(std::move(List));
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}
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void DwarfCompileUnit::attachRangesOrLowHighPC(
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DIE &Die, SmallVector<RangeSpan, 2> Ranges) {
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if (Ranges.size() == 1) {
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const auto &single = Ranges.front();
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attachLowHighPC(Die, single.getStart(), single.getEnd());
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} else
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addScopeRangeList(Die, std::move(Ranges));
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}
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void DwarfCompileUnit::attachRangesOrLowHighPC(
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DIE &Die, const SmallVectorImpl<InsnRange> &Ranges) {
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SmallVector<RangeSpan, 2> List;
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List.reserve(Ranges.size());
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for (const InsnRange &R : Ranges)
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List.push_back(RangeSpan(DD->getLabelBeforeInsn(R.first),
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DD->getLabelAfterInsn(R.second)));
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attachRangesOrLowHighPC(Die, std::move(List));
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}
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// This scope represents inlined body of a function. Construct DIE to
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// represent this concrete inlined copy of the function.
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DIE *DwarfCompileUnit::constructInlinedScopeDIE(LexicalScope *Scope) {
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assert(Scope->getScopeNode());
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auto *DS = Scope->getScopeNode();
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auto *InlinedSP = getDISubprogram(DS);
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// Find the subprogram's DwarfCompileUnit in the SPMap in case the subprogram
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// was inlined from another compile unit.
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DIE *OriginDIE = getAbstractSPDies()[InlinedSP];
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assert(OriginDIE && "Unable to find original DIE for an inlined subprogram.");
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auto ScopeDIE = DIE::get(DIEValueAllocator, dwarf::DW_TAG_inlined_subroutine);
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addDIEEntry(*ScopeDIE, dwarf::DW_AT_abstract_origin, *OriginDIE);
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attachRangesOrLowHighPC(*ScopeDIE, Scope->getRanges());
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// Add the call site information to the DIE.
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const DILocation *IA = Scope->getInlinedAt();
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addUInt(*ScopeDIE, dwarf::DW_AT_call_file, None,
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getOrCreateSourceID(IA->getFilename(), IA->getDirectory()));
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addUInt(*ScopeDIE, dwarf::DW_AT_call_line, None, IA->getLine());
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if (IA->getDiscriminator() && DD->getDwarfVersion() >= 4)
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addUInt(*ScopeDIE, dwarf::DW_AT_GNU_discriminator, None,
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IA->getDiscriminator());
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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_inlined_subprogram nodes.
|
|
DD->addSubprogramNames(InlinedSP, *ScopeDIE);
|
|
|
|
return ScopeDIE;
|
|
}
|
|
|
|
// Construct new DW_TAG_lexical_block for this scope and attach
|
|
// DW_AT_low_pc/DW_AT_high_pc labels.
|
|
DIE *DwarfCompileUnit::constructLexicalScopeDIE(LexicalScope *Scope) {
|
|
if (DD->isLexicalScopeDIENull(Scope))
|
|
return nullptr;
|
|
|
|
auto ScopeDIE = DIE::get(DIEValueAllocator, dwarf::DW_TAG_lexical_block);
|
|
if (Scope->isAbstractScope())
|
|
return ScopeDIE;
|
|
|
|
attachRangesOrLowHighPC(*ScopeDIE, Scope->getRanges());
|
|
|
|
return ScopeDIE;
|
|
}
|
|
|
|
/// constructVariableDIE - Construct a DIE for the given DbgVariable.
|
|
DIE *DwarfCompileUnit::constructVariableDIE(DbgVariable &DV, bool Abstract) {
|
|
auto D = constructVariableDIEImpl(DV, Abstract);
|
|
DV.setDIE(*D);
|
|
return D;
|
|
}
|
|
|
|
DIE *DwarfCompileUnit::constructVariableDIEImpl(const DbgVariable &DV,
|
|
bool Abstract) {
|
|
// Define variable debug information entry.
|
|
auto VariableDie = DIE::get(DIEValueAllocator, DV.getTag());
|
|
|
|
if (Abstract) {
|
|
applyVariableAttributes(DV, *VariableDie);
|
|
return VariableDie;
|
|
}
|
|
|
|
// Add variable address.
|
|
|
|
unsigned Offset = DV.getDebugLocListIndex();
|
|
if (Offset != ~0U) {
|
|
addLocationList(*VariableDie, dwarf::DW_AT_location, Offset);
|
|
return VariableDie;
|
|
}
|
|
|
|
// Check if variable is described by a DBG_VALUE instruction.
|
|
if (const MachineInstr *DVInsn = DV.getMInsn()) {
|
|
assert(DVInsn->getNumOperands() == 4);
|
|
if (DVInsn->getOperand(0).isReg()) {
|
|
auto RegOp = DVInsn->getOperand(0);
|
|
auto Op1 = DVInsn->getOperand(1);
|
|
// If the second operand is an immediate, this is an indirect value.
|
|
assert((!Op1.isImm() || (Op1.getImm() == 0)) && "unexpected offset");
|
|
MachineLocation Location(RegOp.getReg(), Op1.isImm());
|
|
addVariableAddress(DV, *VariableDie, Location);
|
|
} else if (DVInsn->getOperand(0).isImm()) {
|
|
// This variable is described by a single constant.
|
|
// Check whether it has a DIExpression.
|
|
auto *Expr = DV.getSingleExpression();
|
|
if (Expr && Expr->getNumElements()) {
|
|
DIELoc *Loc = new (DIEValueAllocator) DIELoc;
|
|
DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
|
|
// If there is an expression, emit raw unsigned bytes.
|
|
DwarfExpr.addFragmentOffset(Expr);
|
|
DwarfExpr.addUnsignedConstant(DVInsn->getOperand(0).getImm());
|
|
DwarfExpr.addExpression(Expr);
|
|
addBlock(*VariableDie, dwarf::DW_AT_location, DwarfExpr.finalize());
|
|
} else
|
|
addConstantValue(*VariableDie, DVInsn->getOperand(0), DV.getType());
|
|
} else if (DVInsn->getOperand(0).isFPImm())
|
|
addConstantFPValue(*VariableDie, DVInsn->getOperand(0));
|
|
else if (DVInsn->getOperand(0).isCImm())
|
|
addConstantValue(*VariableDie, DVInsn->getOperand(0).getCImm(),
|
|
DV.getType());
|
|
|
|
return VariableDie;
|
|
}
|
|
|
|
// .. else use frame index.
|
|
if (!DV.hasFrameIndexExprs())
|
|
return VariableDie;
|
|
|
|
DIELoc *Loc = new (DIEValueAllocator) DIELoc;
|
|
DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
|
|
for (auto &Fragment : DV.getFrameIndexExprs()) {
|
|
unsigned FrameReg = 0;
|
|
const DIExpression *Expr = Fragment.Expr;
|
|
const TargetFrameLowering *TFI = Asm->MF->getSubtarget().getFrameLowering();
|
|
int Offset = TFI->getFrameIndexReference(*Asm->MF, Fragment.FI, FrameReg);
|
|
DwarfExpr.addFragmentOffset(Expr);
|
|
SmallVector<uint64_t, 8> Ops;
|
|
Ops.push_back(dwarf::DW_OP_plus_uconst);
|
|
Ops.push_back(Offset);
|
|
Ops.append(Expr->elements_begin(), Expr->elements_end());
|
|
DIExpressionCursor Cursor(Ops);
|
|
DwarfExpr.setMemoryLocationKind();
|
|
DwarfExpr.addMachineRegExpression(
|
|
*Asm->MF->getSubtarget().getRegisterInfo(), Cursor, FrameReg);
|
|
DwarfExpr.addExpression(std::move(Cursor));
|
|
}
|
|
addBlock(*VariableDie, dwarf::DW_AT_location, DwarfExpr.finalize());
|
|
|
|
return VariableDie;
|
|
}
|
|
|
|
DIE *DwarfCompileUnit::constructVariableDIE(DbgVariable &DV,
|
|
const LexicalScope &Scope,
|
|
DIE *&ObjectPointer) {
|
|
auto Var = constructVariableDIE(DV, Scope.isAbstractScope());
|
|
if (DV.isObjectPointer())
|
|
ObjectPointer = Var;
|
|
return Var;
|
|
}
|
|
|
|
DIE *DwarfCompileUnit::createScopeChildrenDIE(LexicalScope *Scope,
|
|
SmallVectorImpl<DIE *> &Children,
|
|
bool *HasNonScopeChildren) {
|
|
assert(Children.empty());
|
|
DIE *ObjectPointer = nullptr;
|
|
|
|
for (DbgVariable *DV : DU->getScopeVariables().lookup(Scope))
|
|
Children.push_back(constructVariableDIE(*DV, *Scope, ObjectPointer));
|
|
|
|
// Skip imported directives in gmlt-like data.
|
|
if (!includeMinimalInlineScopes()) {
|
|
// There is no need to emit empty lexical block DIE.
|
|
for (const auto *IE : ImportedEntities[Scope->getScopeNode()])
|
|
Children.push_back(
|
|
constructImportedEntityDIE(cast<DIImportedEntity>(IE)));
|
|
}
|
|
|
|
if (HasNonScopeChildren)
|
|
*HasNonScopeChildren = !Children.empty();
|
|
|
|
for (LexicalScope *LS : Scope->getChildren())
|
|
constructScopeDIE(LS, Children);
|
|
|
|
return ObjectPointer;
|
|
}
|
|
|
|
void DwarfCompileUnit::constructSubprogramScopeDIE(const DISubprogram *Sub, LexicalScope *Scope) {
|
|
DIE &ScopeDIE = updateSubprogramScopeDIE(Sub);
|
|
|
|
if (Scope) {
|
|
assert(!Scope->getInlinedAt());
|
|
assert(!Scope->isAbstractScope());
|
|
// Collect lexical scope children first.
|
|
// ObjectPointer might be a local (non-argument) local variable if it's a
|
|
// block's synthetic this pointer.
|
|
if (DIE *ObjectPointer = createAndAddScopeChildren(Scope, ScopeDIE))
|
|
addDIEEntry(ScopeDIE, dwarf::DW_AT_object_pointer, *ObjectPointer);
|
|
}
|
|
|
|
// If this is a variadic function, add an unspecified parameter.
|
|
DITypeRefArray FnArgs = Sub->getType()->getTypeArray();
|
|
|
|
// If we have a single element of null, it is a function that returns void.
|
|
// If we have more than one elements and the last one is null, it is a
|
|
// variadic function.
|
|
if (FnArgs.size() > 1 && !FnArgs[FnArgs.size() - 1] &&
|
|
!includeMinimalInlineScopes())
|
|
ScopeDIE.addChild(
|
|
DIE::get(DIEValueAllocator, dwarf::DW_TAG_unspecified_parameters));
|
|
}
|
|
|
|
DIE *DwarfCompileUnit::createAndAddScopeChildren(LexicalScope *Scope,
|
|
DIE &ScopeDIE) {
|
|
// We create children when the scope DIE is not null.
|
|
SmallVector<DIE *, 8> Children;
|
|
DIE *ObjectPointer = createScopeChildrenDIE(Scope, Children);
|
|
|
|
// Add children
|
|
for (auto &I : Children)
|
|
ScopeDIE.addChild(std::move(I));
|
|
|
|
return ObjectPointer;
|
|
}
|
|
|
|
void DwarfCompileUnit::constructAbstractSubprogramScopeDIE(
|
|
LexicalScope *Scope) {
|
|
DIE *&AbsDef = getAbstractSPDies()[Scope->getScopeNode()];
|
|
if (AbsDef)
|
|
return;
|
|
|
|
auto *SP = cast<DISubprogram>(Scope->getScopeNode());
|
|
|
|
DIE *ContextDIE;
|
|
|
|
if (includeMinimalInlineScopes())
|
|
ContextDIE = &getUnitDie();
|
|
// Some of this is duplicated from DwarfUnit::getOrCreateSubprogramDIE, with
|
|
// the important distinction that the debug node is not associated with the
|
|
// DIE (since the debug node will be associated with the concrete DIE, if
|
|
// any). It could be refactored to some common utility function.
|
|
else if (auto *SPDecl = SP->getDeclaration()) {
|
|
ContextDIE = &getUnitDie();
|
|
getOrCreateSubprogramDIE(SPDecl);
|
|
} else
|
|
ContextDIE = getOrCreateContextDIE(resolve(SP->getScope()));
|
|
|
|
// Passing null as the associated node because the abstract definition
|
|
// shouldn't be found by lookup.
|
|
AbsDef = &createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE, nullptr);
|
|
applySubprogramAttributesToDefinition(SP, *AbsDef);
|
|
|
|
if (!includeMinimalInlineScopes())
|
|
addUInt(*AbsDef, dwarf::DW_AT_inline, None, dwarf::DW_INL_inlined);
|
|
if (DIE *ObjectPointer = createAndAddScopeChildren(Scope, *AbsDef))
|
|
addDIEEntry(*AbsDef, dwarf::DW_AT_object_pointer, *ObjectPointer);
|
|
}
|
|
|
|
DIE *DwarfCompileUnit::constructImportedEntityDIE(
|
|
const DIImportedEntity *Module) {
|
|
DIE *IMDie = DIE::get(DIEValueAllocator, (dwarf::Tag)Module->getTag());
|
|
insertDIE(Module, IMDie);
|
|
DIE *EntityDie;
|
|
auto *Entity = resolve(Module->getEntity());
|
|
if (auto *NS = dyn_cast<DINamespace>(Entity))
|
|
EntityDie = getOrCreateNameSpace(NS);
|
|
else if (auto *M = dyn_cast<DIModule>(Entity))
|
|
EntityDie = getOrCreateModule(M);
|
|
else if (auto *SP = dyn_cast<DISubprogram>(Entity))
|
|
EntityDie = getOrCreateSubprogramDIE(SP);
|
|
else if (auto *T = dyn_cast<DIType>(Entity))
|
|
EntityDie = getOrCreateTypeDIE(T);
|
|
else if (auto *GV = dyn_cast<DIGlobalVariable>(Entity))
|
|
EntityDie = getOrCreateGlobalVariableDIE(GV, {});
|
|
else
|
|
EntityDie = getDIE(Entity);
|
|
assert(EntityDie);
|
|
auto *File = Module->getFile();
|
|
addSourceLine(*IMDie, Module->getLine(), File ? File->getFilename() : "",
|
|
File ? File->getDirectory() : "");
|
|
addDIEEntry(*IMDie, dwarf::DW_AT_import, *EntityDie);
|
|
StringRef Name = Module->getName();
|
|
if (!Name.empty())
|
|
addString(*IMDie, dwarf::DW_AT_name, Name);
|
|
|
|
return IMDie;
|
|
}
|
|
|
|
void DwarfCompileUnit::finishSubprogramDefinition(const DISubprogram *SP) {
|
|
DIE *D = getDIE(SP);
|
|
if (DIE *AbsSPDIE = getAbstractSPDies().lookup(SP)) {
|
|
if (D)
|
|
// If this subprogram has an abstract definition, reference that
|
|
addDIEEntry(*D, dwarf::DW_AT_abstract_origin, *AbsSPDIE);
|
|
} else {
|
|
assert(D || includeMinimalInlineScopes());
|
|
if (D)
|
|
// And attach the attributes
|
|
applySubprogramAttributesToDefinition(SP, *D);
|
|
}
|
|
}
|
|
|
|
void DwarfCompileUnit::finishVariableDefinition(const DbgVariable &Var) {
|
|
DbgVariable *AbsVar = getExistingAbstractVariable(
|
|
InlinedVariable(Var.getVariable(), Var.getInlinedAt()));
|
|
auto *VariableDie = Var.getDIE();
|
|
if (AbsVar && AbsVar->getDIE()) {
|
|
addDIEEntry(*VariableDie, dwarf::DW_AT_abstract_origin,
|
|
*AbsVar->getDIE());
|
|
} else
|
|
applyVariableAttributes(Var, *VariableDie);
|
|
}
|
|
|
|
DbgVariable *DwarfCompileUnit::getExistingAbstractVariable(InlinedVariable IV) {
|
|
const DILocalVariable *Cleansed;
|
|
return getExistingAbstractVariable(IV, Cleansed);
|
|
}
|
|
|
|
// Find abstract variable, if any, associated with Var.
|
|
DbgVariable *DwarfCompileUnit::getExistingAbstractVariable(
|
|
InlinedVariable IV, const DILocalVariable *&Cleansed) {
|
|
// More then one inlined variable corresponds to one abstract variable.
|
|
Cleansed = IV.first;
|
|
auto &AbstractVariables = getAbstractVariables();
|
|
auto I = AbstractVariables.find(Cleansed);
|
|
if (I != AbstractVariables.end())
|
|
return I->second.get();
|
|
return nullptr;
|
|
}
|
|
|
|
void DwarfCompileUnit::createAbstractVariable(const DILocalVariable *Var,
|
|
LexicalScope *Scope) {
|
|
assert(Scope && Scope->isAbstractScope());
|
|
auto AbsDbgVariable = llvm::make_unique<DbgVariable>(Var, /* IA */ nullptr);
|
|
DU->addScopeVariable(Scope, AbsDbgVariable.get());
|
|
getAbstractVariables()[Var] = std::move(AbsDbgVariable);
|
|
}
|
|
|
|
void DwarfCompileUnit::emitHeader(bool UseOffsets) {
|
|
// Don't bother labeling the .dwo unit, as its offset isn't used.
|
|
if (!Skeleton) {
|
|
LabelBegin = Asm->createTempSymbol("cu_begin");
|
|
Asm->OutStreamer->EmitLabel(LabelBegin);
|
|
}
|
|
|
|
dwarf::UnitType UT = Skeleton ? dwarf::DW_UT_split_compile
|
|
: DD->useSplitDwarf() ? dwarf::DW_UT_skeleton
|
|
: dwarf::DW_UT_compile;
|
|
DwarfUnit::emitCommonHeader(UseOffsets, UT);
|
|
}
|
|
|
|
bool DwarfCompileUnit::hasDwarfPubSections() const {
|
|
// Opting in to GNU Pubnames/types overrides the default to ensure these are
|
|
// generated for things like Gold's gdb_index generation.
|
|
if (CUNode->getGnuPubnames())
|
|
return true;
|
|
|
|
return DD->tuneForGDB() && !includeMinimalInlineScopes();
|
|
}
|
|
|
|
/// addGlobalName - Add a new global name to the compile unit.
|
|
void DwarfCompileUnit::addGlobalName(StringRef Name, const DIE &Die,
|
|
const DIScope *Context) {
|
|
if (!hasDwarfPubSections())
|
|
return;
|
|
std::string FullName = getParentContextString(Context) + Name.str();
|
|
GlobalNames[FullName] = &Die;
|
|
}
|
|
|
|
void DwarfCompileUnit::addGlobalNameForTypeUnit(StringRef Name,
|
|
const DIScope *Context) {
|
|
if (!hasDwarfPubSections())
|
|
return;
|
|
std::string FullName = getParentContextString(Context) + Name.str();
|
|
// Insert, allowing the entry to remain as-is if it's already present
|
|
// This way the CU-level type DIE is preferred over the "can't describe this
|
|
// type as a unit offset because it's not really in the CU at all, it's only
|
|
// in a type unit"
|
|
GlobalNames.insert(std::make_pair(std::move(FullName), &getUnitDie()));
|
|
}
|
|
|
|
/// Add a new global type to the unit.
|
|
void DwarfCompileUnit::addGlobalType(const DIType *Ty, const DIE &Die,
|
|
const DIScope *Context) {
|
|
if (!hasDwarfPubSections())
|
|
return;
|
|
std::string FullName = getParentContextString(Context) + Ty->getName().str();
|
|
GlobalTypes[FullName] = &Die;
|
|
}
|
|
|
|
void DwarfCompileUnit::addGlobalTypeUnitType(const DIType *Ty,
|
|
const DIScope *Context) {
|
|
if (!hasDwarfPubSections())
|
|
return;
|
|
std::string FullName = getParentContextString(Context) + Ty->getName().str();
|
|
// Insert, allowing the entry to remain as-is if it's already present
|
|
// This way the CU-level type DIE is preferred over the "can't describe this
|
|
// type as a unit offset because it's not really in the CU at all, it's only
|
|
// in a type unit"
|
|
GlobalTypes.insert(std::make_pair(std::move(FullName), &getUnitDie()));
|
|
}
|
|
|
|
/// addVariableAddress - Add DW_AT_location attribute for a
|
|
/// DbgVariable based on provided MachineLocation.
|
|
void DwarfCompileUnit::addVariableAddress(const DbgVariable &DV, DIE &Die,
|
|
MachineLocation Location) {
|
|
if (DV.hasComplexAddress())
|
|
addComplexAddress(DV, Die, dwarf::DW_AT_location, Location);
|
|
else if (DV.isBlockByrefVariable())
|
|
addBlockByrefAddress(DV, Die, dwarf::DW_AT_location, Location);
|
|
else
|
|
addAddress(Die, dwarf::DW_AT_location, Location);
|
|
}
|
|
|
|
/// Add an address attribute to a die based on the location provided.
|
|
void DwarfCompileUnit::addAddress(DIE &Die, dwarf::Attribute Attribute,
|
|
const MachineLocation &Location) {
|
|
DIELoc *Loc = new (DIEValueAllocator) DIELoc;
|
|
DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
|
|
if (Location.isIndirect())
|
|
DwarfExpr.setMemoryLocationKind();
|
|
|
|
DIExpressionCursor Cursor({});
|
|
const TargetRegisterInfo &TRI = *Asm->MF->getSubtarget().getRegisterInfo();
|
|
if (!DwarfExpr.addMachineRegExpression(TRI, Cursor, Location.getReg()))
|
|
return;
|
|
DwarfExpr.addExpression(std::move(Cursor));
|
|
|
|
// Now attach the location information to the DIE.
|
|
addBlock(Die, Attribute, DwarfExpr.finalize());
|
|
}
|
|
|
|
/// Start with the address based on the location provided, and generate the
|
|
/// DWARF information necessary to find the actual variable given the extra
|
|
/// address information encoded in the DbgVariable, starting from the starting
|
|
/// location. Add the DWARF information to the die.
|
|
void DwarfCompileUnit::addComplexAddress(const DbgVariable &DV, DIE &Die,
|
|
dwarf::Attribute Attribute,
|
|
const MachineLocation &Location) {
|
|
DIELoc *Loc = new (DIEValueAllocator) DIELoc;
|
|
DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
|
|
const DIExpression *DIExpr = DV.getSingleExpression();
|
|
DwarfExpr.addFragmentOffset(DIExpr);
|
|
if (Location.isIndirect())
|
|
DwarfExpr.setMemoryLocationKind();
|
|
|
|
DIExpressionCursor Cursor(DIExpr);
|
|
const TargetRegisterInfo &TRI = *Asm->MF->getSubtarget().getRegisterInfo();
|
|
if (!DwarfExpr.addMachineRegExpression(TRI, Cursor, Location.getReg()))
|
|
return;
|
|
DwarfExpr.addExpression(std::move(Cursor));
|
|
|
|
// Now attach the location information to the DIE.
|
|
addBlock(Die, Attribute, DwarfExpr.finalize());
|
|
}
|
|
|
|
/// Add a Dwarf loclistptr attribute data and value.
|
|
void DwarfCompileUnit::addLocationList(DIE &Die, dwarf::Attribute Attribute,
|
|
unsigned Index) {
|
|
dwarf::Form Form = DD->getDwarfVersion() >= 4 ? dwarf::DW_FORM_sec_offset
|
|
: dwarf::DW_FORM_data4;
|
|
Die.addValue(DIEValueAllocator, Attribute, Form, DIELocList(Index));
|
|
}
|
|
|
|
void DwarfCompileUnit::applyVariableAttributes(const DbgVariable &Var,
|
|
DIE &VariableDie) {
|
|
StringRef Name = Var.getName();
|
|
if (!Name.empty())
|
|
addString(VariableDie, dwarf::DW_AT_name, Name);
|
|
const auto *DIVar = Var.getVariable();
|
|
if (DIVar)
|
|
if (uint32_t AlignInBytes = DIVar->getAlignInBytes())
|
|
addUInt(VariableDie, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
|
|
AlignInBytes);
|
|
|
|
addSourceLine(VariableDie, DIVar);
|
|
addType(VariableDie, Var.getType());
|
|
if (Var.isArtificial())
|
|
addFlag(VariableDie, dwarf::DW_AT_artificial);
|
|
}
|
|
|
|
/// Add a Dwarf expression attribute data and value.
|
|
void DwarfCompileUnit::addExpr(DIELoc &Die, dwarf::Form Form,
|
|
const MCExpr *Expr) {
|
|
Die.addValue(DIEValueAllocator, (dwarf::Attribute)0, Form, DIEExpr(Expr));
|
|
}
|
|
|
|
void DwarfCompileUnit::applySubprogramAttributesToDefinition(
|
|
const DISubprogram *SP, DIE &SPDie) {
|
|
auto *SPDecl = SP->getDeclaration();
|
|
auto *Context = resolve(SPDecl ? SPDecl->getScope() : SP->getScope());
|
|
applySubprogramAttributes(SP, SPDie, includeMinimalInlineScopes());
|
|
addGlobalName(SP->getName(), SPDie, Context);
|
|
}
|
|
|
|
bool DwarfCompileUnit::isDwoUnit() const {
|
|
return DD->useSplitDwarf() && Skeleton;
|
|
}
|
|
|
|
bool DwarfCompileUnit::includeMinimalInlineScopes() const {
|
|
return getCUNode()->getEmissionKind() == DICompileUnit::LineTablesOnly ||
|
|
(DD->useSplitDwarf() && !Skeleton);
|
|
}
|