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