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572 lines
20 KiB
572 lines
20 KiB
//===-- llvm/CodeGen/DwarfDebug.h - Dwarf Debug Framework ------*- C++ -*--===//
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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 writing dwarf debug info into asm files.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DWARFDEBUG_H
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#define LLVM_LIB_CODEGEN_ASMPRINTER_DWARFDEBUG_H
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#include "DbgValueHistoryCalculator.h"
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#include "DebugHandlerBase.h"
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#include "DebugLocStream.h"
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#include "DwarfAccelTable.h"
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#include "DwarfFile.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/DenseSet.h"
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#include "llvm/ADT/MapVector.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/StringMap.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/MachineInstr.h"
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#include "llvm/IR/DebugInfo.h"
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#include "llvm/IR/DebugLoc.h"
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#include "llvm/MC/MCDwarf.h"
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#include "llvm/MC/MachineLocation.h"
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#include "llvm/Support/Allocator.h"
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#include "llvm/Target/TargetOptions.h"
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#include <memory>
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namespace llvm {
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class AsmPrinter;
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class ByteStreamer;
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class ConstantInt;
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class ConstantFP;
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class DebugLocEntry;
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class DwarfCompileUnit;
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class DwarfDebug;
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class DwarfTypeUnit;
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class DwarfUnit;
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class MachineModuleInfo;
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//===----------------------------------------------------------------------===//
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/// This class is used to track local variable information.
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///
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/// Variables can be created from allocas, in which case they're generated from
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/// the MMI table. Such variables can have multiple expressions and frame
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/// indices. The \a Expr and \a FrameIndices array must match.
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///
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/// Variables can be created from \c DBG_VALUE instructions. Those whose
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/// location changes over time use \a DebugLocListIndex, while those with a
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/// single instruction use \a MInsn and (optionally) a single entry of \a Expr.
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///
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/// Variables that have been optimized out use none of these fields.
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class DbgVariable {
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const DILocalVariable *Var; /// Variable Descriptor.
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const DILocation *IA; /// Inlined at location.
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SmallVector<const DIExpression *, 1> Expr; /// Complex address.
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DIE *TheDIE = nullptr; /// Variable DIE.
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unsigned DebugLocListIndex = ~0u; /// Offset in DebugLocs.
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const MachineInstr *MInsn = nullptr; /// DBG_VALUE instruction.
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SmallVector<int, 1> FrameIndex; /// Frame index.
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public:
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/// Construct a DbgVariable.
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///
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/// Creates a variable without any DW_AT_location. Call \a initializeMMI()
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/// for MMI entries, or \a initializeDbgValue() for DBG_VALUE instructions.
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DbgVariable(const DILocalVariable *V, const DILocation *IA)
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: Var(V), IA(IA) {}
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/// Initialize from the MMI table.
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void initializeMMI(const DIExpression *E, int FI) {
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assert(Expr.empty() && "Already initialized?");
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assert(FrameIndex.empty() && "Already initialized?");
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assert(!MInsn && "Already initialized?");
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assert((!E || E->isValid()) && "Expected valid expression");
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assert(~FI && "Expected valid index");
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Expr.push_back(E);
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FrameIndex.push_back(FI);
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}
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/// Initialize from a DBG_VALUE instruction.
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void initializeDbgValue(const MachineInstr *DbgValue) {
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assert(Expr.empty() && "Already initialized?");
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assert(FrameIndex.empty() && "Already initialized?");
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assert(!MInsn && "Already initialized?");
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assert(Var == DbgValue->getDebugVariable() && "Wrong variable");
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assert(IA == DbgValue->getDebugLoc()->getInlinedAt() && "Wrong inlined-at");
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MInsn = DbgValue;
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if (auto *E = DbgValue->getDebugExpression())
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if (E->getNumElements())
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Expr.push_back(E);
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}
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// Accessors.
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const DILocalVariable *getVariable() const { return Var; }
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const DILocation *getInlinedAt() const { return IA; }
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ArrayRef<const DIExpression *> getExpression() const { return Expr; }
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const DIExpression *getSingleExpression() const {
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assert(MInsn && Expr.size() <= 1);
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return Expr.size() ? Expr[0] : nullptr;
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}
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void setDIE(DIE &D) { TheDIE = &D; }
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DIE *getDIE() const { return TheDIE; }
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void setDebugLocListIndex(unsigned O) { DebugLocListIndex = O; }
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unsigned getDebugLocListIndex() const { return DebugLocListIndex; }
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StringRef getName() const { return Var->getName(); }
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const MachineInstr *getMInsn() const { return MInsn; }
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ArrayRef<int> getFrameIndex() const { return FrameIndex; }
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void addMMIEntry(const DbgVariable &V) {
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assert(DebugLocListIndex == ~0U && !MInsn && "not an MMI entry");
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assert(V.DebugLocListIndex == ~0U && !V.MInsn && "not an MMI entry");
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assert(V.Var == Var && "conflicting variable");
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assert(V.IA == IA && "conflicting inlined-at location");
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assert(!FrameIndex.empty() && "Expected an MMI entry");
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assert(!V.FrameIndex.empty() && "Expected an MMI entry");
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assert(Expr.size() == FrameIndex.size() && "Mismatched expressions");
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assert(V.Expr.size() == V.FrameIndex.size() && "Mismatched expressions");
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Expr.append(V.Expr.begin(), V.Expr.end());
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FrameIndex.append(V.FrameIndex.begin(), V.FrameIndex.end());
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assert(std::all_of(Expr.begin(), Expr.end(), [](const DIExpression *E) {
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return E && E->isBitPiece();
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}) && "conflicting locations for variable");
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}
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// Translate tag to proper Dwarf tag.
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dwarf::Tag getTag() const {
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// FIXME: Why don't we just infer this tag and store it all along?
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if (Var->isParameter())
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return dwarf::DW_TAG_formal_parameter;
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return dwarf::DW_TAG_variable;
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}
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/// Return true if DbgVariable is artificial.
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bool isArtificial() const {
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if (Var->isArtificial())
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return true;
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if (getType()->isArtificial())
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return true;
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return false;
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}
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bool isObjectPointer() const {
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if (Var->isObjectPointer())
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return true;
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if (getType()->isObjectPointer())
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return true;
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return false;
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}
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bool hasComplexAddress() const {
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assert(MInsn && "Expected DBG_VALUE, not MMI variable");
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assert(FrameIndex.empty() && "Expected DBG_VALUE, not MMI variable");
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assert(
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(Expr.empty() || (Expr.size() == 1 && Expr.back()->getNumElements())) &&
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"Invalid Expr for DBG_VALUE");
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return !Expr.empty();
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}
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bool isBlockByrefVariable() const;
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const DIType *getType() const;
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private:
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template <typename T> T *resolve(TypedDINodeRef<T> Ref) const {
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return Ref.resolve();
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}
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};
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/// Helper used to pair up a symbol and its DWARF compile unit.
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struct SymbolCU {
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SymbolCU(DwarfCompileUnit *CU, const MCSymbol *Sym) : Sym(Sym), CU(CU) {}
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const MCSymbol *Sym;
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DwarfCompileUnit *CU;
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};
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/// Collects and handles dwarf debug information.
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class DwarfDebug : public DebugHandlerBase {
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/// All DIEValues are allocated through this allocator.
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BumpPtrAllocator DIEValueAllocator;
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/// Maps MDNode with its corresponding DwarfCompileUnit.
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MapVector<const MDNode *, DwarfCompileUnit *> CUMap;
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/// Maps a CU DIE with its corresponding DwarfCompileUnit.
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DenseMap<const DIE *, DwarfCompileUnit *> CUDieMap;
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/// List of all labels used in aranges generation.
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std::vector<SymbolCU> ArangeLabels;
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/// Size of each symbol emitted (for those symbols that have a specific size).
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DenseMap<const MCSymbol *, uint64_t> SymSize;
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/// Collection of abstract variables.
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DenseMap<const MDNode *, std::unique_ptr<DbgVariable>> AbstractVariables;
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SmallVector<std::unique_ptr<DbgVariable>, 64> ConcreteVariables;
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/// Collection of DebugLocEntry. Stored in a linked list so that DIELocLists
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/// can refer to them in spite of insertions into this list.
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DebugLocStream DebugLocs;
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/// This is a collection of subprogram MDNodes that are processed to
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/// create DIEs.
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SmallPtrSet<const MDNode *, 16> ProcessedSPNodes;
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/// If nonnull, stores the current machine function we're processing.
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const MachineFunction *CurFn;
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/// If nonnull, stores the CU in which the previous subprogram was contained.
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const DwarfCompileUnit *PrevCU;
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/// As an optimization, there is no need to emit an entry in the directory
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/// table for the same directory as DW_AT_comp_dir.
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StringRef CompilationDir;
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/// Holder for the file specific debug information.
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DwarfFile InfoHolder;
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/// Holders for the various debug information flags that we might need to
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/// have exposed. See accessor functions below for description.
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/// Map from MDNodes for user-defined types to their type signatures. Also
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/// used to keep track of which types we have emitted type units for.
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DenseMap<const MDNode *, uint64_t> TypeSignatures;
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SmallVector<
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std::pair<std::unique_ptr<DwarfTypeUnit>, const DICompositeType *>, 1>
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TypeUnitsUnderConstruction;
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/// Whether to emit the pubnames/pubtypes sections.
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bool HasDwarfPubSections;
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/// Whether to use the GNU TLS opcode (instead of the standard opcode).
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bool UseGNUTLSOpcode;
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/// Whether to use DWARF 2 bitfields (instead of the DWARF 4 format).
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bool UseDWARF2Bitfields;
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/// Whether to emit all linkage names, or just abstract subprograms.
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bool UseAllLinkageNames;
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/// Version of dwarf we're emitting.
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unsigned DwarfVersion;
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/// DWARF5 Experimental Options
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/// @{
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bool HasDwarfAccelTables;
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bool HasAppleExtensionAttributes;
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bool HasSplitDwarf;
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/// Separated Dwarf Variables
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/// In general these will all be for bits that are left in the
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/// original object file, rather than things that are meant
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/// to be in the .dwo sections.
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/// Holder for the skeleton information.
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DwarfFile SkeletonHolder;
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/// Store file names for type units under fission in a line table
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/// header that will be emitted into debug_line.dwo.
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// FIXME: replace this with a map from comp_dir to table so that we
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// can emit multiple tables during LTO each of which uses directory
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// 0, referencing the comp_dir of all the type units that use it.
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MCDwarfDwoLineTable SplitTypeUnitFileTable;
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/// @}
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/// True iff there are multiple CUs in this module.
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bool SingleCU;
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bool IsDarwin;
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AddressPool AddrPool;
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DwarfAccelTable AccelNames;
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DwarfAccelTable AccelObjC;
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DwarfAccelTable AccelNamespace;
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DwarfAccelTable AccelTypes;
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// Identify a debugger for "tuning" the debug info.
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DebuggerKind DebuggerTuning;
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/// \defgroup DebuggerTuning Predicates to tune DWARF for a given debugger.
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///
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/// Returns whether we are "tuning" for a given debugger.
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/// Should be used only within the constructor, to set feature flags.
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/// @{
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bool tuneForGDB() const { return DebuggerTuning == DebuggerKind::GDB; }
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bool tuneForLLDB() const { return DebuggerTuning == DebuggerKind::LLDB; }
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bool tuneForSCE() const { return DebuggerTuning == DebuggerKind::SCE; }
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/// @}
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MCDwarfDwoLineTable *getDwoLineTable(const DwarfCompileUnit &);
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const SmallVectorImpl<std::unique_ptr<DwarfCompileUnit>> &getUnits() {
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return InfoHolder.getUnits();
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}
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typedef DbgValueHistoryMap::InlinedVariable InlinedVariable;
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/// Find abstract variable associated with Var.
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DbgVariable *getExistingAbstractVariable(InlinedVariable IV,
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const DILocalVariable *&Cleansed);
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DbgVariable *getExistingAbstractVariable(InlinedVariable IV);
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void createAbstractVariable(const DILocalVariable *DV, LexicalScope *Scope);
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void ensureAbstractVariableIsCreated(InlinedVariable Var,
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const MDNode *Scope);
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void ensureAbstractVariableIsCreatedIfScoped(InlinedVariable Var,
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const MDNode *Scope);
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DbgVariable *createConcreteVariable(LexicalScope &Scope, InlinedVariable IV);
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/// Construct a DIE for this abstract scope.
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void constructAbstractSubprogramScopeDIE(LexicalScope *Scope);
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void finishVariableDefinitions();
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void finishSubprogramDefinitions();
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/// Finish off debug information after all functions have been
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/// processed.
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void finalizeModuleInfo();
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/// Emit the debug info section.
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void emitDebugInfo();
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/// Emit the abbreviation section.
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void emitAbbreviations();
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/// Emit a specified accelerator table.
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void emitAccel(DwarfAccelTable &Accel, MCSection *Section,
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StringRef TableName);
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/// Emit visible names into a hashed accelerator table section.
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void emitAccelNames();
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/// Emit objective C classes and categories into a hashed
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/// accelerator table section.
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void emitAccelObjC();
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/// Emit namespace dies into a hashed accelerator table.
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void emitAccelNamespaces();
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/// Emit type dies into a hashed accelerator table.
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void emitAccelTypes();
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/// Emit visible names into a debug pubnames section.
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/// \param GnuStyle determines whether or not we want to emit
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/// additional information into the table ala newer gcc for gdb
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/// index.
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void emitDebugPubNames(bool GnuStyle = false);
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/// Emit visible types into a debug pubtypes section.
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/// \param GnuStyle determines whether or not we want to emit
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/// additional information into the table ala newer gcc for gdb
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/// index.
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void emitDebugPubTypes(bool GnuStyle = false);
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void emitDebugPubSection(
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bool GnuStyle, MCSection *PSec, StringRef Name,
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const StringMap<const DIE *> &(DwarfCompileUnit::*Accessor)() const);
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/// Emit null-terminated strings into a debug str section.
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void emitDebugStr();
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/// Emit variable locations into a debug loc section.
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void emitDebugLoc();
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/// Emit variable locations into a debug loc dwo section.
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void emitDebugLocDWO();
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/// Emit address ranges into a debug aranges section.
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void emitDebugARanges();
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/// Emit address ranges into a debug ranges section.
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void emitDebugRanges();
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/// Emit macros into a debug macinfo section.
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void emitDebugMacinfo();
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void emitMacro(DIMacro &M);
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void emitMacroFile(DIMacroFile &F, DwarfCompileUnit &U);
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void handleMacroNodes(DIMacroNodeArray Nodes, DwarfCompileUnit &U);
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/// DWARF 5 Experimental Split Dwarf Emitters
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/// Initialize common features of skeleton units.
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void initSkeletonUnit(const DwarfUnit &U, DIE &Die,
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std::unique_ptr<DwarfCompileUnit> NewU);
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/// Construct the split debug info compile unit for the debug info
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/// section.
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DwarfCompileUnit &constructSkeletonCU(const DwarfCompileUnit &CU);
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/// Emit the debug info dwo section.
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void emitDebugInfoDWO();
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/// Emit the debug abbrev dwo section.
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void emitDebugAbbrevDWO();
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/// Emit the debug line dwo section.
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void emitDebugLineDWO();
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/// Emit the debug str dwo section.
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void emitDebugStrDWO();
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/// Flags to let the linker know we have emitted new style pubnames. Only
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/// emit it here if we don't have a skeleton CU for split dwarf.
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void addGnuPubAttributes(DwarfUnit &U, DIE &D) const;
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/// Create new DwarfCompileUnit for the given metadata node with tag
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/// DW_TAG_compile_unit.
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DwarfCompileUnit &constructDwarfCompileUnit(const DICompileUnit *DIUnit);
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/// Construct imported_module or imported_declaration DIE.
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void constructAndAddImportedEntityDIE(DwarfCompileUnit &TheCU,
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const DIImportedEntity *N);
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/// Register a source line with debug info. Returns the unique
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/// label that was emitted and which provides correspondence to the
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/// source line list.
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void recordSourceLine(unsigned Line, unsigned Col, const MDNode *Scope,
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unsigned Flags);
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/// Populate LexicalScope entries with variables' info.
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void collectVariableInfo(DwarfCompileUnit &TheCU, const DISubprogram *SP,
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DenseSet<InlinedVariable> &ProcessedVars);
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/// Build the location list for all DBG_VALUEs in the
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/// function that describe the same variable.
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void buildLocationList(SmallVectorImpl<DebugLocEntry> &DebugLoc,
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const DbgValueHistoryMap::InstrRanges &Ranges);
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/// Collect variable information from the side table maintained
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/// by MMI.
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void collectVariableInfoFromMMITable(DenseSet<InlinedVariable> &P);
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public:
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//===--------------------------------------------------------------------===//
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// Main entry points.
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//
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DwarfDebug(AsmPrinter *A, Module *M);
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~DwarfDebug() override;
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/// Emit all Dwarf sections that should come prior to the
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/// content.
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void beginModule();
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/// Emit all Dwarf sections that should come after the content.
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void endModule() override;
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/// Gather pre-function debug information.
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void beginFunction(const MachineFunction *MF) override;
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/// Gather and emit post-function debug information.
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void endFunction(const MachineFunction *MF) override;
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/// Process beginning of an instruction.
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void beginInstruction(const MachineInstr *MI) override;
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/// Perform an MD5 checksum of \p Identifier and return the lower 64 bits.
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static uint64_t makeTypeSignature(StringRef Identifier);
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/// Add a DIE to the set of types that we're going to pull into
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/// type units.
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void addDwarfTypeUnitType(DwarfCompileUnit &CU, StringRef Identifier,
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DIE &Die, const DICompositeType *CTy);
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/// Add a label so that arange data can be generated for it.
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void addArangeLabel(SymbolCU SCU) { ArangeLabels.push_back(SCU); }
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/// For symbols that have a size designated (e.g. common symbols),
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/// this tracks that size.
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void setSymbolSize(const MCSymbol *Sym, uint64_t Size) override {
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SymSize[Sym] = Size;
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}
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/// Returns whether we should emit all DW_AT_[MIPS_]linkage_name.
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/// If not, we still might emit certain cases.
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bool useAllLinkageNames() const { return UseAllLinkageNames; }
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/// Returns whether to use DW_OP_GNU_push_tls_address, instead of the
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/// standard DW_OP_form_tls_address opcode
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bool useGNUTLSOpcode() const { return UseGNUTLSOpcode; }
|
|
|
|
/// Returns whether to use the DWARF2 format for bitfields instyead of the
|
|
/// DWARF4 format.
|
|
bool useDWARF2Bitfields() const { return UseDWARF2Bitfields; }
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|
|
// Experimental DWARF5 features.
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|
|
|
/// Returns whether or not to emit tables that dwarf consumers can
|
|
/// use to accelerate lookup.
|
|
bool useDwarfAccelTables() const { return HasDwarfAccelTables; }
|
|
|
|
bool useAppleExtensionAttributes() const {
|
|
return HasAppleExtensionAttributes;
|
|
}
|
|
|
|
/// Returns whether or not to change the current debug info for the
|
|
/// split dwarf proposal support.
|
|
bool useSplitDwarf() const { return HasSplitDwarf; }
|
|
|
|
/// Returns the Dwarf Version.
|
|
unsigned getDwarfVersion() const { return DwarfVersion; }
|
|
|
|
/// Returns the previous CU that was being updated
|
|
const DwarfCompileUnit *getPrevCU() const { return PrevCU; }
|
|
void setPrevCU(const DwarfCompileUnit *PrevCU) { this->PrevCU = PrevCU; }
|
|
|
|
/// Returns the entries for the .debug_loc section.
|
|
const DebugLocStream &getDebugLocs() const { return DebugLocs; }
|
|
|
|
/// Emit an entry for the debug loc section. This can be used to
|
|
/// handle an entry that's going to be emitted into the debug loc section.
|
|
void emitDebugLocEntry(ByteStreamer &Streamer,
|
|
const DebugLocStream::Entry &Entry);
|
|
|
|
/// Emit the location for a debug loc entry, including the size header.
|
|
void emitDebugLocEntryLocation(const DebugLocStream::Entry &Entry);
|
|
|
|
/// Find the MDNode for the given reference.
|
|
template <typename T> T *resolve(TypedDINodeRef<T> Ref) const {
|
|
return Ref.resolve();
|
|
}
|
|
|
|
/// Find the DwarfCompileUnit for the given CU Die.
|
|
DwarfCompileUnit *lookupUnit(const DIE *CU) const {
|
|
return CUDieMap.lookup(CU);
|
|
}
|
|
|
|
void addSubprogramNames(const DISubprogram *SP, DIE &Die);
|
|
|
|
AddressPool &getAddressPool() { return AddrPool; }
|
|
|
|
void addAccelName(StringRef Name, const DIE &Die);
|
|
|
|
void addAccelObjC(StringRef Name, const DIE &Die);
|
|
|
|
void addAccelNamespace(StringRef Name, const DIE &Die);
|
|
|
|
void addAccelType(StringRef Name, const DIE &Die, char Flags);
|
|
|
|
const MachineFunction *getCurrentFunction() const { return CurFn; }
|
|
|
|
/// A helper function to check whether the DIE for a given Scope is
|
|
/// going to be null.
|
|
bool isLexicalScopeDIENull(LexicalScope *Scope);
|
|
|
|
// FIXME: Sink these functions down into DwarfFile/Dwarf*Unit.
|
|
|
|
SmallPtrSet<const MDNode *, 16> &getProcessedSPNodes() {
|
|
return ProcessedSPNodes;
|
|
}
|
|
};
|
|
} // End of namespace llvm
|
|
|
|
#endif
|