mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171905 91177308-0d34-0410-b5e6-96231b3b80d8
632 lines
22 KiB
C++
632 lines
22 KiB
C++
//===-- 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 CODEGEN_ASMPRINTER_DWARFDEBUG_H__
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#define CODEGEN_ASMPRINTER_DWARFDEBUG_H__
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#include "DIE.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/FoldingSet.h"
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#include "llvm/ADT/SetVector.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/AsmPrinter.h"
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#include "llvm/CodeGen/LexicalScopes.h"
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#include "llvm/DebugInfo.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/Support/DebugLoc.h"
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namespace llvm {
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class CompileUnit;
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class ConstantInt;
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class ConstantFP;
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class DbgVariable;
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class MachineFrameInfo;
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class MachineModuleInfo;
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class MachineOperand;
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class MCAsmInfo;
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class DIEAbbrev;
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class DIE;
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class DIEBlock;
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class DIEEntry;
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class DwarfDebug;
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//===----------------------------------------------------------------------===//
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/// \brief This class is used to record source line correspondence.
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class SrcLineInfo {
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unsigned Line; // Source line number.
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unsigned Column; // Source column.
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unsigned SourceID; // Source ID number.
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MCSymbol *Label; // Label in code ID number.
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public:
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SrcLineInfo(unsigned L, unsigned C, unsigned S, MCSymbol *label)
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: Line(L), Column(C), SourceID(S), Label(label) {}
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// Accessors
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unsigned getLine() const { return Line; }
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unsigned getColumn() const { return Column; }
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unsigned getSourceID() const { return SourceID; }
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MCSymbol *getLabel() const { return Label; }
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};
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/// \brief This struct describes location entries emitted in the .debug_loc
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/// section.
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typedef struct DotDebugLocEntry {
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const MCSymbol *Begin;
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const MCSymbol *End;
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MachineLocation Loc;
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const MDNode *Variable;
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bool Merged;
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bool Constant;
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enum EntryType {
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E_Location,
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E_Integer,
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E_ConstantFP,
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E_ConstantInt
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};
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enum EntryType EntryKind;
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union {
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int64_t Int;
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const ConstantFP *CFP;
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const ConstantInt *CIP;
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} Constants;
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DotDebugLocEntry()
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: Begin(0), End(0), Variable(0), Merged(false),
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Constant(false) { Constants.Int = 0;}
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DotDebugLocEntry(const MCSymbol *B, const MCSymbol *E, MachineLocation &L,
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const MDNode *V)
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: Begin(B), End(E), Loc(L), Variable(V), Merged(false),
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Constant(false) { Constants.Int = 0; EntryKind = E_Location; }
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DotDebugLocEntry(const MCSymbol *B, const MCSymbol *E, int64_t i)
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: Begin(B), End(E), Variable(0), Merged(false),
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Constant(true) { Constants.Int = i; EntryKind = E_Integer; }
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DotDebugLocEntry(const MCSymbol *B, const MCSymbol *E, const ConstantFP *FPtr)
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: Begin(B), End(E), Variable(0), Merged(false),
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Constant(true) { Constants.CFP = FPtr; EntryKind = E_ConstantFP; }
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DotDebugLocEntry(const MCSymbol *B, const MCSymbol *E,
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const ConstantInt *IPtr)
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: Begin(B), End(E), Variable(0), Merged(false),
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Constant(true) { Constants.CIP = IPtr; EntryKind = E_ConstantInt; }
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/// \brief Empty entries are also used as a trigger to emit temp label. Such
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/// labels are referenced is used to find debug_loc offset for a given DIE.
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bool isEmpty() { return Begin == 0 && End == 0; }
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bool isMerged() { return Merged; }
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void Merge(DotDebugLocEntry *Next) {
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if (!(Begin && Loc == Next->Loc && End == Next->Begin))
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return;
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Next->Begin = Begin;
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Merged = true;
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}
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bool isLocation() const { return EntryKind == E_Location; }
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bool isInt() const { return EntryKind == E_Integer; }
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bool isConstantFP() const { return EntryKind == E_ConstantFP; }
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bool isConstantInt() const { return EntryKind == E_ConstantInt; }
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int64_t getInt() { return Constants.Int; }
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const ConstantFP *getConstantFP() { return Constants.CFP; }
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const ConstantInt *getConstantInt() { return Constants.CIP; }
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} DotDebugLocEntry;
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//===----------------------------------------------------------------------===//
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/// \brief This class is used to track local variable information.
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class DbgVariable {
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DIVariable Var; // Variable Descriptor.
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DIE *TheDIE; // Variable DIE.
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unsigned DotDebugLocOffset; // Offset in DotDebugLocEntries.
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DbgVariable *AbsVar; // Corresponding Abstract variable, if any.
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const MachineInstr *MInsn; // DBG_VALUE instruction of the variable.
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int FrameIndex;
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public:
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// AbsVar may be NULL.
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DbgVariable(DIVariable V, DbgVariable *AV)
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: Var(V), TheDIE(0), DotDebugLocOffset(~0U), AbsVar(AV), MInsn(0),
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FrameIndex(~0) {}
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// Accessors.
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DIVariable getVariable() const { return Var; }
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void setDIE(DIE *D) { TheDIE = D; }
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DIE *getDIE() const { return TheDIE; }
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void setDotDebugLocOffset(unsigned O) { DotDebugLocOffset = O; }
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unsigned getDotDebugLocOffset() const { return DotDebugLocOffset; }
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StringRef getName() const { return Var.getName(); }
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DbgVariable *getAbstractVariable() const { return AbsVar; }
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const MachineInstr *getMInsn() const { return MInsn; }
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void setMInsn(const MachineInstr *M) { MInsn = M; }
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int getFrameIndex() const { return FrameIndex; }
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void setFrameIndex(int FI) { FrameIndex = FI; }
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// Translate tag to proper Dwarf tag.
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unsigned getTag() const {
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if (Var.getTag() == dwarf::DW_TAG_arg_variable)
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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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/// \brief 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 variableHasComplexAddress() const {
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assert(Var.Verify() && "Invalid complex DbgVariable!");
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return Var.hasComplexAddress();
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}
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bool isBlockByrefVariable() const {
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assert(Var.Verify() && "Invalid complex DbgVariable!");
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return Var.isBlockByrefVariable();
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}
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unsigned getNumAddrElements() const {
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assert(Var.Verify() && "Invalid complex DbgVariable!");
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return Var.getNumAddrElements();
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}
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uint64_t getAddrElement(unsigned i) const {
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return Var.getAddrElement(i);
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}
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DIType getType() const;
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};
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// A String->Symbol mapping of strings used by indirect
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// references.
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typedef StringMap<std::pair<MCSymbol*, unsigned>,
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BumpPtrAllocator&> StrPool;
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/// \brief Collects and handles information specific to a particular
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/// collection of units.
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class DwarfUnits {
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// Target of Dwarf emission, used for sizing of abbreviations.
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AsmPrinter *Asm;
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// Used to uniquely define abbreviations.
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FoldingSet<DIEAbbrev> *AbbreviationsSet;
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// A list of all the unique abbreviations in use.
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std::vector<DIEAbbrev *> *Abbreviations;
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// A pointer to all units in the section.
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SmallVector<CompileUnit *, 1> CUs;
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// Collection of strings for this unit and assorted symbols.
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StrPool StringPool;
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unsigned NextStringPoolNumber;
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std::string StringPref;
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public:
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DwarfUnits(AsmPrinter *AP, FoldingSet<DIEAbbrev> *AS,
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std::vector<DIEAbbrev *> *A, const char *Pref,
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BumpPtrAllocator &DA) :
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Asm(AP), AbbreviationsSet(AS), Abbreviations(A),
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StringPool(DA), NextStringPoolNumber(0), StringPref(Pref) {}
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/// \brief Compute the size and offset of a DIE given an incoming Offset.
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unsigned computeSizeAndOffset(DIE *Die, unsigned Offset);
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/// \brief Compute the size and offset of all the DIEs.
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void computeSizeAndOffsets();
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/// \brief Define a unique number for the abbreviation.
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void assignAbbrevNumber(DIEAbbrev &Abbrev);
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/// \brief Add a unit to the list of CUs.
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void addUnit(CompileUnit *CU) { CUs.push_back(CU); }
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/// \brief Emit all of the units to the section listed with the given
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/// abbreviation section.
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void emitUnits(DwarfDebug *, const MCSection *, const MCSection *,
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const MCSymbol *);
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/// \brief Emit all of the strings to the section given.
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void emitStrings(const MCSection *, const MCSection *, const MCSymbol *);
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/// \brief Returns the entry into the start of the pool.
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MCSymbol *getStringPoolSym();
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/// \brief Returns an entry into the string pool with the given
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/// string text.
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MCSymbol *getStringPoolEntry(StringRef Str);
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/// \brief Returns the index into the string pool with the given
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/// string text.
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unsigned getStringPoolIndex(StringRef Str);
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/// \brief Returns the string pool.
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StrPool *getStringPool() { return &StringPool; }
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};
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/// \brief Collects and handles dwarf debug information.
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class DwarfDebug {
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// Target of Dwarf emission.
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AsmPrinter *Asm;
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// Collected machine module information.
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MachineModuleInfo *MMI;
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// All DIEValues are allocated through this allocator.
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BumpPtrAllocator DIEValueAllocator;
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//===--------------------------------------------------------------------===//
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// Attribute used to construct specific Dwarf sections.
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//
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CompileUnit *FirstCU;
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// Maps MDNode with its corresponding CompileUnit.
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DenseMap <const MDNode *, CompileUnit *> CUMap;
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// Maps subprogram MDNode with its corresponding CompileUnit.
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DenseMap <const MDNode *, CompileUnit *> SPMap;
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// Used to uniquely define abbreviations.
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FoldingSet<DIEAbbrev> AbbreviationsSet;
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// A list of all the unique abbreviations in use.
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std::vector<DIEAbbrev *> Abbreviations;
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// Source id map, i.e. pair of source filename and directory,
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// separated by a zero byte, mapped to a unique id.
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StringMap<unsigned, BumpPtrAllocator&> SourceIdMap;
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// Provides a unique id per text section.
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SetVector<const MCSection*> SectionMap;
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// List of Arguments (DbgValues) for current function.
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SmallVector<DbgVariable *, 8> CurrentFnArguments;
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LexicalScopes LScopes;
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// Collection of abstract subprogram DIEs.
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DenseMap<const MDNode *, DIE *> AbstractSPDies;
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// Collection of dbg variables of a scope.
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DenseMap<LexicalScope *, SmallVector<DbgVariable *, 8> > ScopeVariables;
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// Collection of abstract variables.
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DenseMap<const MDNode *, DbgVariable *> AbstractVariables;
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// Collection of DotDebugLocEntry.
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SmallVector<DotDebugLocEntry, 4> DotDebugLocEntries;
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// Collection of subprogram DIEs that are marked (at the end of the module)
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// as DW_AT_inline.
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SmallPtrSet<DIE *, 4> InlinedSubprogramDIEs;
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// Keep track of inlined functions and their location. This
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// information is used to populate the debug_inlined section.
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typedef std::pair<const MCSymbol *, DIE *> InlineInfoLabels;
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DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> > InlineInfo;
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SmallVector<const MDNode *, 4> InlinedSPNodes;
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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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// Maps instruction with label emitted before instruction.
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DenseMap<const MachineInstr *, MCSymbol *> LabelsBeforeInsn;
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// Maps instruction with label emitted after instruction.
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DenseMap<const MachineInstr *, MCSymbol *> LabelsAfterInsn;
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// Every user variable mentioned by a DBG_VALUE instruction in order of
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// appearance.
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SmallVector<const MDNode*, 8> UserVariables;
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// For each user variable, keep a list of DBG_VALUE instructions in order.
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// The list can also contain normal instructions that clobber the previous
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// DBG_VALUE.
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typedef DenseMap<const MDNode*, SmallVector<const MachineInstr*, 4> >
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DbgValueHistoryMap;
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DbgValueHistoryMap DbgValues;
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SmallVector<const MCSymbol *, 8> DebugRangeSymbols;
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// Previous instruction's location information. This is used to determine
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// label location to indicate scope boundries in dwarf debug info.
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DebugLoc PrevInstLoc;
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MCSymbol *PrevLabel;
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// This location indicates end of function prologue and beginning of function
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// body.
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DebugLoc PrologEndLoc;
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struct FunctionDebugFrameInfo {
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unsigned Number;
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std::vector<MachineMove> Moves;
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FunctionDebugFrameInfo(unsigned Num, const std::vector<MachineMove> &M)
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: Number(Num), Moves(M) {}
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};
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std::vector<FunctionDebugFrameInfo> DebugFrames;
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// Section Symbols: these are assembler temporary labels that are emitted at
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// the beginning of each supported dwarf section. These are used to form
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// section offsets and are created by EmitSectionLabels.
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MCSymbol *DwarfInfoSectionSym, *DwarfAbbrevSectionSym;
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MCSymbol *DwarfStrSectionSym, *TextSectionSym, *DwarfDebugRangeSectionSym;
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MCSymbol *DwarfDebugLocSectionSym;
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MCSymbol *FunctionBeginSym, *FunctionEndSym;
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MCSymbol *DwarfAbbrevDWOSectionSym, *DwarfStrDWOSectionSym;
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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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// Counter for assigning globally unique IDs for CUs.
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unsigned GlobalCUIndexCount;
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// Holder for the file specific debug information.
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DwarfUnits 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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// Whether or not we're emitting info for older versions of gdb on darwin.
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bool IsDarwinGDBCompat;
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// DWARF5 Experimental Options
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bool HasDwarfAccelTables;
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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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// The CU left in the original object file for separated debug info.
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CompileUnit *SkeletonCU;
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// Used to uniquely define abbreviations for the skeleton emission.
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FoldingSet<DIEAbbrev> SkeletonAbbrevSet;
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// A list of all the unique abbreviations in use.
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std::vector<DIEAbbrev *> SkeletonAbbrevs;
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// Holder for the skeleton information.
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DwarfUnits SkeletonHolder;
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private:
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void addScopeVariable(LexicalScope *LS, DbgVariable *Var);
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/// \brief Find abstract variable associated with Var.
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DbgVariable *findAbstractVariable(DIVariable &Var, DebugLoc Loc);
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/// \brief Find DIE for the given subprogram and attach appropriate
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/// DW_AT_low_pc and DW_AT_high_pc attributes. If there are global
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/// variables in this scope then create and insert DIEs for these
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/// variables.
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DIE *updateSubprogramScopeDIE(CompileUnit *SPCU, const MDNode *SPNode);
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/// \brief Construct new DW_TAG_lexical_block for this scope and
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/// attach DW_AT_low_pc/DW_AT_high_pc labels.
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DIE *constructLexicalScopeDIE(CompileUnit *TheCU, LexicalScope *Scope);
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/// \brief This scope represents inlined body of a function. Construct
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/// DIE to represent this concrete inlined copy of the function.
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DIE *constructInlinedScopeDIE(CompileUnit *TheCU, LexicalScope *Scope);
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/// \brief Construct a DIE for this scope.
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DIE *constructScopeDIE(CompileUnit *TheCU, LexicalScope *Scope);
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/// \brief Emit initial Dwarf sections with a label at the start of each one.
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void emitSectionLabels();
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/// \brief Compute the size and offset of a DIE given an incoming Offset.
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unsigned computeSizeAndOffset(DIE *Die, unsigned Offset);
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/// \brief Compute the size and offset of all the DIEs.
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void computeSizeAndOffsets();
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/// \brief Attach DW_AT_inline attribute with inlined subprogram DIEs.
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void computeInlinedDIEs();
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/// \brief Collect info for variables that were optimized out.
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void collectDeadVariables();
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/// \brief Finish off debug information after all functions have been
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/// processed.
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void finalizeModuleInfo();
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/// \brief Emit labels to close any remaining sections that have been left
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/// open.
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void endSections();
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/// \brief Emit a set of abbreviations to the specific section.
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void emitAbbrevs(const MCSection *, std::vector<DIEAbbrev*> *);
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/// \brief Emit the debug info section.
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void emitDebugInfo();
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/// \brief Emit the abbreviation section.
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void emitAbbreviations();
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/// \brief Emit the last address of the section and the end of
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/// the line matrix.
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void emitEndOfLineMatrix(unsigned SectionEnd);
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/// \brief Emit visible names into a hashed accelerator table section.
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void emitAccelNames();
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/// \brief 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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/// \brief Emit namespace dies into a hashed accelerator table.
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void emitAccelNamespaces();
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/// \brief Emit type dies into a hashed accelerator table.
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void emitAccelTypes();
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/// \brief Emit visible types into a debug pubtypes section.
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void emitDebugPubTypes();
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/// \brief Emit visible names into a debug str section.
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void emitDebugStr();
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/// \brief Emit visible names into a debug loc section.
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void emitDebugLoc();
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/// \brief Emit visible names into a debug aranges section.
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void emitDebugARanges();
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/// \brief Emit visible names into a debug ranges section.
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void emitDebugRanges();
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/// \brief Emit visible names into a debug macinfo section.
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void emitDebugMacInfo();
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/// \brief Emit inline info using custom format.
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void emitDebugInlineInfo();
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/// DWARF 5 Experimental Split Dwarf Emitters
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/// \brief Construct the split debug info compile unit for the debug info
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/// section.
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CompileUnit *constructSkeletonCU(const MDNode *);
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/// \brief Emit the local split debug info section.
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void emitSkeletonCU(const MCSection *);
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/// \brief Emit the local split abbreviations.
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void emitSkeletonAbbrevs(const MCSection *);
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/// \brief Emit the debug info dwo section.
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void emitDebugInfoDWO();
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/// \brief Emit the debug abbrev dwo section.
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void emitDebugAbbrevDWO();
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/// \brief Emit the debug str dwo section.
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void emitDebugStrDWO();
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/// \brief Create new CompileUnit for the given metadata node with tag
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/// DW_TAG_compile_unit.
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CompileUnit *constructCompileUnit(const MDNode *N);
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/// \brief Construct subprogram DIE.
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void constructSubprogramDIE(CompileUnit *TheCU, const MDNode *N);
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/// \brief Register a source line with debug info. Returns the unique
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|
/// label that was emitted and which provides correspondence to the
|
|
/// source line list.
|
|
void recordSourceLine(unsigned Line, unsigned Col, const MDNode *Scope,
|
|
unsigned Flags);
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|
|
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/// \brief Indentify instructions that are marking the beginning of or
|
|
/// ending of a scope.
|
|
void identifyScopeMarkers();
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|
|
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/// \brief If Var is an current function argument that add it in
|
|
/// CurrentFnArguments list.
|
|
bool addCurrentFnArgument(const MachineFunction *MF,
|
|
DbgVariable *Var, LexicalScope *Scope);
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|
|
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/// \brief Populate LexicalScope entries with variables' info.
|
|
void collectVariableInfo(const MachineFunction *,
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SmallPtrSet<const MDNode *, 16> &ProcessedVars);
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|
|
/// \brief Collect variable information from the side table maintained
|
|
/// by MMI.
|
|
void collectVariableInfoFromMMITable(const MachineFunction * MF,
|
|
SmallPtrSet<const MDNode *, 16> &P);
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|
|
|
/// \brief Ensure that a label will be emitted before MI.
|
|
void requestLabelBeforeInsn(const MachineInstr *MI) {
|
|
LabelsBeforeInsn.insert(std::make_pair(MI, (MCSymbol*)0));
|
|
}
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|
|
|
/// \brief Return Label preceding the instruction.
|
|
const MCSymbol *getLabelBeforeInsn(const MachineInstr *MI);
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|
|
|
/// \brief Ensure that a label will be emitted after MI.
|
|
void requestLabelAfterInsn(const MachineInstr *MI) {
|
|
LabelsAfterInsn.insert(std::make_pair(MI, (MCSymbol*)0));
|
|
}
|
|
|
|
/// \brief Return Label immediately following the instruction.
|
|
const MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
|
|
|
|
public:
|
|
//===--------------------------------------------------------------------===//
|
|
// Main entry points.
|
|
//
|
|
DwarfDebug(AsmPrinter *A, Module *M);
|
|
~DwarfDebug();
|
|
|
|
/// \brief Collect debug info from named mdnodes such as llvm.dbg.enum
|
|
/// and llvm.dbg.ty
|
|
void collectInfoFromNamedMDNodes(const Module *M);
|
|
|
|
/// \brief Collect debug info using DebugInfoFinder.
|
|
/// FIXME - Remove this when DragonEgg switches to DIBuilder.
|
|
bool collectLegacyDebugInfo(const Module *M);
|
|
|
|
/// \brief Emit all Dwarf sections that should come prior to the
|
|
/// content.
|
|
void beginModule();
|
|
|
|
/// \brief Emit all Dwarf sections that should come after the content.
|
|
void endModule();
|
|
|
|
/// \brief Gather pre-function debug information.
|
|
void beginFunction(const MachineFunction *MF);
|
|
|
|
/// \brief Gather and emit post-function debug information.
|
|
void endFunction(const MachineFunction *MF);
|
|
|
|
/// \brief Process beginning of an instruction.
|
|
void beginInstruction(const MachineInstr *MI);
|
|
|
|
/// \brief Process end of an instruction.
|
|
void endInstruction(const MachineInstr *MI);
|
|
|
|
/// \brief Look up the source id with the given directory and source file
|
|
/// names. If none currently exists, create a new id and insert it in the
|
|
/// SourceIds map.
|
|
unsigned getOrCreateSourceID(StringRef DirName, StringRef FullName);
|
|
|
|
/// \brief Recursively Emits a debug information entry.
|
|
void emitDIE(DIE *Die, std::vector<DIEAbbrev *> *Abbrevs);
|
|
|
|
/// \brief Returns whether or not to limit some of our debug
|
|
/// output to the limitations of darwin gdb.
|
|
bool useDarwinGDBCompat() { return IsDarwinGDBCompat; }
|
|
|
|
// Experimental DWARF5 features.
|
|
|
|
/// \brief Returns whether or not to emit tables that dwarf consumers can
|
|
/// use to accelerate lookup.
|
|
bool useDwarfAccelTables() { return HasDwarfAccelTables; }
|
|
|
|
/// \brief Returns whether or not to change the current debug info for the
|
|
/// split dwarf proposal support.
|
|
bool useSplitDwarf() { return HasSplitDwarf; }
|
|
};
|
|
} // End of namespace llvm
|
|
|
|
#endif
|