1 //===-- llvm/CodeGen/DwarfDebug.h - Dwarf Debug Framework ------*- C++ -*--===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains support for writing dwarf debug info into asm files.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DWARFDEBUG_H
15 #define LLVM_LIB_CODEGEN_ASMPRINTER_DWARFDEBUG_H
17 #include "AsmPrinterHandler.h"
18 #include "DbgValueHistoryCalculator.h"
19 #include "DebugLocStream.h"
20 #include "DwarfAccelTable.h"
21 #include "DwarfFile.h"
22 #include "llvm/ADT/DenseMap.h"
23 #include "llvm/ADT/DenseSet.h"
24 #include "llvm/ADT/FoldingSet.h"
25 #include "llvm/ADT/MapVector.h"
26 #include "llvm/ADT/SmallPtrSet.h"
27 #include "llvm/ADT/StringMap.h"
28 #include "llvm/CodeGen/DIE.h"
29 #include "llvm/CodeGen/LexicalScopes.h"
30 #include "llvm/CodeGen/MachineInstr.h"
31 #include "llvm/IR/DebugInfo.h"
32 #include "llvm/IR/DebugLoc.h"
33 #include "llvm/MC/MCDwarf.h"
34 #include "llvm/MC/MachineLocation.h"
35 #include "llvm/Support/Allocator.h"
45 class DwarfCompileUnit;
49 class MachineModuleInfo;
51 //===----------------------------------------------------------------------===//
52 /// This class is used to record source line correspondence.
54 unsigned Line; // Source line number.
55 unsigned Column; // Source column.
56 unsigned SourceID; // Source ID number.
57 MCSymbol *Label; // Label in code ID number.
59 SrcLineInfo(unsigned L, unsigned C, unsigned S, MCSymbol *label)
60 : Line(L), Column(C), SourceID(S), Label(label) {}
63 unsigned getLine() const { return Line; }
64 unsigned getColumn() const { return Column; }
65 unsigned getSourceID() const { return SourceID; }
66 MCSymbol *getLabel() const { return Label; }
69 //===----------------------------------------------------------------------===//
70 /// This class is used to track local variable information.
72 /// Variables can be created from allocas, in which case they're generated from
73 /// the MMI table. Such variables can have multiple expressions and frame
74 /// indices. The \a Expr and \a FrameIndices array must match.
76 /// Variables can be created from \c DBG_VALUE instructions. Those whose
77 /// location changes over time use \a DebugLocListIndex, while those with a
78 /// single instruction use \a MInsn and (optionally) a single entry of \a Expr.
80 /// Variables that have been optimized out use none of these fields.
82 const DILocalVariable *Var; /// Variable Descriptor.
83 const DILocation *IA; /// Inlined at location.
84 SmallVector<const DIExpression *, 1> Expr; /// Complex address.
85 DIE *TheDIE = nullptr; /// Variable DIE.
86 unsigned DebugLocListIndex = ~0u; /// Offset in DebugLocs.
87 const MachineInstr *MInsn = nullptr; /// DBG_VALUE instruction.
88 SmallVector<int, 1> FrameIndex; /// Frame index.
92 /// Construct a DbgVariable.
94 /// Creates a variable without any DW_AT_location. Call \a initializeMMI()
95 /// for MMI entries, or \a initializeDbgValue() for DBG_VALUE instructions.
96 DbgVariable(const DILocalVariable *V, const DILocation *IA, DwarfDebug *DD)
97 : Var(V), IA(IA), DD(DD) {}
99 /// Initialize from the MMI table.
100 void initializeMMI(const DIExpression *E, int FI) {
101 assert(Expr.empty() && "Already initialized?");
102 assert(FrameIndex.empty() && "Already initialized?");
103 assert(!MInsn && "Already initialized?");
105 assert((!E || E->isValid()) && "Expected valid expression");
106 assert(~FI && "Expected valid index");
109 FrameIndex.push_back(FI);
112 /// Initialize from a DBG_VALUE instruction.
113 void initializeDbgValue(const MachineInstr *DbgValue) {
114 assert(Expr.empty() && "Already initialized?");
115 assert(FrameIndex.empty() && "Already initialized?");
116 assert(!MInsn && "Already initialized?");
118 assert(Var == DbgValue->getDebugVariable() && "Wrong variable");
119 assert(IA == DbgValue->getDebugLoc()->getInlinedAt() && "Wrong inlined-at");
122 if (auto *E = DbgValue->getDebugExpression())
123 if (E->getNumElements())
128 const DILocalVariable *getVariable() const { return Var; }
129 const DILocation *getInlinedAt() const { return IA; }
130 const ArrayRef<const DIExpression *> getExpression() const { return Expr; }
131 void setDIE(DIE &D) { TheDIE = &D; }
132 DIE *getDIE() const { return TheDIE; }
133 void setDebugLocListIndex(unsigned O) { DebugLocListIndex = O; }
134 unsigned getDebugLocListIndex() const { return DebugLocListIndex; }
135 StringRef getName() const { return Var->getName(); }
136 const MachineInstr *getMInsn() const { return MInsn; }
137 const ArrayRef<int> getFrameIndex() const { return FrameIndex; }
139 void addMMIEntry(const DbgVariable &V) {
140 assert(DebugLocListIndex == ~0U && !MInsn && "not an MMI entry");
141 assert(V.DebugLocListIndex == ~0U && !V.MInsn && "not an MMI entry");
142 assert(V.Var == Var && "conflicting variable");
143 assert(V.IA == IA && "conflicting inlined-at location");
145 assert(!FrameIndex.empty() && "Expected an MMI entry");
146 assert(!V.FrameIndex.empty() && "Expected an MMI entry");
147 assert(Expr.size() == FrameIndex.size() && "Mismatched expressions");
148 assert(V.Expr.size() == V.FrameIndex.size() && "Mismatched expressions");
150 Expr.append(V.Expr.begin(), V.Expr.end());
151 FrameIndex.append(V.FrameIndex.begin(), V.FrameIndex.end());
152 assert(std::all_of(Expr.begin(), Expr.end(), [](const DIExpression *E) {
153 return E && E->isBitPiece();
154 }) && "conflicting locations for variable");
157 // Translate tag to proper Dwarf tag.
158 dwarf::Tag getTag() const {
159 // FIXME: Why don't we just infer this tag and store it all along?
160 if (Var->isParameter())
161 return dwarf::DW_TAG_formal_parameter;
163 return dwarf::DW_TAG_variable;
165 /// Return true if DbgVariable is artificial.
166 bool isArtificial() const {
167 if (Var->isArtificial())
169 if (getType()->isArtificial())
174 bool isObjectPointer() const {
175 if (Var->isObjectPointer())
177 if (getType()->isObjectPointer())
182 bool hasComplexAddress() const {
183 assert(MInsn && "Expected DBG_VALUE, not MMI variable");
184 assert(FrameIndex.empty() && "Expected DBG_VALUE, not MMI variable");
186 (Expr.empty() || (Expr.size() == 1 && Expr.back()->getNumElements())) &&
187 "Invalid Expr for DBG_VALUE");
188 return !Expr.empty();
190 bool isBlockByrefVariable() const;
191 const DIType *getType() const;
194 /// Look in the DwarfDebug map for the MDNode that
195 /// corresponds to the reference.
196 template <typename T> T *resolve(TypedDINodeRef<T> Ref) const;
200 /// Helper used to pair up a symbol and its DWARF compile unit.
202 SymbolCU(DwarfCompileUnit *CU, const MCSymbol *Sym) : Sym(Sym), CU(CU) {}
204 DwarfCompileUnit *CU;
207 /// Identify a debugger for "tuning" the debug info.
209 /// The "debugger tuning" concept allows us to present a more intuitive
210 /// interface that unpacks into different sets of defaults for the various
211 /// individual feature-flag settings, that suit the preferences of the
212 /// various debuggers. However, it's worth remembering that debuggers are
213 /// not the only consumers of debug info, and some variations in DWARF might
214 /// better be treated as target/platform issues. Fundamentally,
215 /// o if the feature is useful (or not) to a particular debugger, regardless
216 /// of the target, that's a tuning decision;
217 /// o if the feature is useful (or not) on a particular platform, regardless
218 /// of the debugger, that's a target decision.
219 /// It's not impossible to see both factors in some specific case.
221 /// The "tuning" should be used to set defaults for individual feature flags
222 /// in DwarfDebug; if a given feature has a more specific command-line option,
223 /// that option should take precedence over the tuning.
224 enum class DebuggerKind {
225 Default, // No specific tuning requested.
226 GDB, // Tune debug info for gdb.
227 LLDB, // Tune debug info for lldb.
228 SCE // Tune debug info for SCE targets (e.g. PS4).
231 /// Collects and handles dwarf debug information.
232 class DwarfDebug : public AsmPrinterHandler {
233 /// Target of Dwarf emission.
236 /// Collected machine module information.
237 MachineModuleInfo *MMI;
239 /// All DIEValues are allocated through this allocator.
240 BumpPtrAllocator DIEValueAllocator;
242 /// Maps MDNode with its corresponding DwarfCompileUnit.
243 MapVector<const MDNode *, DwarfCompileUnit *> CUMap;
245 /// Maps subprogram MDNode with its corresponding DwarfCompileUnit.
246 MapVector<const MDNode *, DwarfCompileUnit *> SPMap;
248 /// Maps a CU DIE with its corresponding DwarfCompileUnit.
249 DenseMap<const DIE *, DwarfCompileUnit *> CUDieMap;
251 /// List of all labels used in aranges generation.
252 std::vector<SymbolCU> ArangeLabels;
254 /// Size of each symbol emitted (for those symbols that have a specific size).
255 DenseMap<const MCSymbol *, uint64_t> SymSize;
257 LexicalScopes LScopes;
259 /// Collection of abstract variables.
260 DenseMap<const MDNode *, std::unique_ptr<DbgVariable>> AbstractVariables;
261 SmallVector<std::unique_ptr<DbgVariable>, 64> ConcreteVariables;
263 /// Collection of DebugLocEntry. Stored in a linked list so that DIELocLists
264 /// can refer to them in spite of insertions into this list.
265 DebugLocStream DebugLocs;
267 /// This is a collection of subprogram MDNodes that are processed to
269 SmallPtrSet<const MDNode *, 16> ProcessedSPNodes;
271 /// Maps instruction with label emitted before instruction.
272 DenseMap<const MachineInstr *, MCSymbol *> LabelsBeforeInsn;
274 /// Maps instruction with label emitted after instruction.
275 DenseMap<const MachineInstr *, MCSymbol *> LabelsAfterInsn;
277 /// History of DBG_VALUE and clobber instructions for each user
278 /// variable. Variables are listed in order of appearance.
279 DbgValueHistoryMap DbgValues;
281 /// Previous instruction's location information. This is used to
282 /// determine label location to indicate scope boundries in dwarf
284 DebugLoc PrevInstLoc;
287 /// This location indicates end of function prologue and beginning of
289 DebugLoc PrologEndLoc;
291 /// If nonnull, stores the current machine function we're processing.
292 const MachineFunction *CurFn;
294 /// If nonnull, stores the current machine instruction we're processing.
295 const MachineInstr *CurMI;
297 /// If nonnull, stores the CU in which the previous subprogram was contained.
298 const DwarfCompileUnit *PrevCU;
300 /// As an optimization, there is no need to emit an entry in the directory
301 /// table for the same directory as DW_AT_comp_dir.
302 StringRef CompilationDir;
304 /// Holder for the file specific debug information.
305 DwarfFile InfoHolder;
307 /// Holders for the various debug information flags that we might need to
308 /// have exposed. See accessor functions below for description.
310 /// Holder for imported entities.
311 typedef SmallVector<std::pair<const MDNode *, const MDNode *>, 32>
313 ImportedEntityMap ScopesWithImportedEntities;
315 /// Map from MDNodes for user-defined types to the type units that
317 DenseMap<const MDNode *, const DwarfTypeUnit *> DwarfTypeUnits;
320 std::pair<std::unique_ptr<DwarfTypeUnit>, const DICompositeType *>, 1>
321 TypeUnitsUnderConstruction;
323 /// Whether to emit the pubnames/pubtypes sections.
324 bool HasDwarfPubSections;
326 /// Whether or not to use AT_ranges for compilation units.
329 /// Whether we emitted a function into a section other than the
331 bool UsedNonDefaultText;
333 /// Whether to use the GNU TLS opcode (instead of the standard opcode).
334 bool UseGNUTLSOpcode;
336 /// Whether to emit DW_AT_[MIPS_]linkage_name.
337 bool UseLinkageNames;
339 /// Version of dwarf we're emitting.
340 unsigned DwarfVersion;
342 /// Maps from a type identifier to the actual MDNode.
343 DITypeIdentifierMap TypeIdentifierMap;
345 /// DWARF5 Experimental Options
347 bool HasDwarfAccelTables;
350 /// Separated Dwarf Variables
351 /// In general these will all be for bits that are left in the
352 /// original object file, rather than things that are meant
353 /// to be in the .dwo sections.
355 /// Holder for the skeleton information.
356 DwarfFile SkeletonHolder;
358 /// Store file names for type units under fission in a line table
359 /// header that will be emitted into debug_line.dwo.
360 // FIXME: replace this with a map from comp_dir to table so that we
361 // can emit multiple tables during LTO each of which uses directory
362 // 0, referencing the comp_dir of all the type units that use it.
363 MCDwarfDwoLineTable SplitTypeUnitFileTable;
366 /// True iff there are multiple CUs in this module.
370 AddressPool AddrPool;
372 DwarfAccelTable AccelNames;
373 DwarfAccelTable AccelObjC;
374 DwarfAccelTable AccelNamespace;
375 DwarfAccelTable AccelTypes;
377 DenseMap<const Function *, DISubprogram *> FunctionDIs;
379 // Identify a debugger for "tuning" the debug info.
380 DebuggerKind DebuggerTuning;
382 MCDwarfDwoLineTable *getDwoLineTable(const DwarfCompileUnit &);
384 const SmallVectorImpl<std::unique_ptr<DwarfUnit>> &getUnits() {
385 return InfoHolder.getUnits();
388 typedef DbgValueHistoryMap::InlinedVariable InlinedVariable;
390 /// Find abstract variable associated with Var.
391 DbgVariable *getExistingAbstractVariable(InlinedVariable IV,
392 const DILocalVariable *&Cleansed);
393 DbgVariable *getExistingAbstractVariable(InlinedVariable IV);
394 void createAbstractVariable(const DILocalVariable *DV, LexicalScope *Scope);
395 void ensureAbstractVariableIsCreated(InlinedVariable Var,
396 const MDNode *Scope);
397 void ensureAbstractVariableIsCreatedIfScoped(InlinedVariable Var,
398 const MDNode *Scope);
400 DbgVariable *createConcreteVariable(LexicalScope &Scope, InlinedVariable IV);
402 /// Construct a DIE for this abstract scope.
403 void constructAbstractSubprogramScopeDIE(LexicalScope *Scope);
405 /// Compute the size and offset of a DIE given an incoming Offset.
406 unsigned computeSizeAndOffset(DIE *Die, unsigned Offset);
408 /// Compute the size and offset of all the DIEs.
409 void computeSizeAndOffsets();
411 /// Collect info for variables that were optimized out.
412 void collectDeadVariables();
414 void finishVariableDefinitions();
416 void finishSubprogramDefinitions();
418 /// Finish off debug information after all functions have been
420 void finalizeModuleInfo();
422 /// Emit the debug info section.
423 void emitDebugInfo();
425 /// Emit the abbreviation section.
426 void emitAbbreviations();
428 /// Emit a specified accelerator table.
429 void emitAccel(DwarfAccelTable &Accel, MCSection *Section,
430 StringRef TableName);
432 /// Emit visible names into a hashed accelerator table section.
433 void emitAccelNames();
435 /// Emit objective C classes and categories into a hashed
436 /// accelerator table section.
437 void emitAccelObjC();
439 /// Emit namespace dies into a hashed accelerator table.
440 void emitAccelNamespaces();
442 /// Emit type dies into a hashed accelerator table.
443 void emitAccelTypes();
445 /// Emit visible names into a debug pubnames section.
446 /// \param GnuStyle determines whether or not we want to emit
447 /// additional information into the table ala newer gcc for gdb
449 void emitDebugPubNames(bool GnuStyle = false);
451 /// Emit visible types into a debug pubtypes section.
452 /// \param GnuStyle determines whether or not we want to emit
453 /// additional information into the table ala newer gcc for gdb
455 void emitDebugPubTypes(bool GnuStyle = false);
457 void emitDebugPubSection(
458 bool GnuStyle, MCSection *PSec, StringRef Name,
459 const StringMap<const DIE *> &(DwarfCompileUnit::*Accessor)() const);
461 /// Emit visible names into a debug str section.
464 /// Emit visible names into a debug loc section.
467 /// Emit visible names into a debug loc dwo section.
468 void emitDebugLocDWO();
470 /// Emit visible names into a debug aranges section.
471 void emitDebugARanges();
473 /// Emit visible names into a debug ranges section.
474 void emitDebugRanges();
476 /// Emit inline info using custom format.
477 void emitDebugInlineInfo();
479 /// DWARF 5 Experimental Split Dwarf Emitters
481 /// Initialize common features of skeleton units.
482 void initSkeletonUnit(const DwarfUnit &U, DIE &Die,
483 std::unique_ptr<DwarfUnit> NewU);
485 /// Construct the split debug info compile unit for the debug info
487 DwarfCompileUnit &constructSkeletonCU(const DwarfCompileUnit &CU);
489 /// Construct the split debug info compile unit for the debug info
491 DwarfTypeUnit &constructSkeletonTU(DwarfTypeUnit &TU);
493 /// Emit the debug info dwo section.
494 void emitDebugInfoDWO();
496 /// Emit the debug abbrev dwo section.
497 void emitDebugAbbrevDWO();
499 /// Emit the debug line dwo section.
500 void emitDebugLineDWO();
502 /// Emit the debug str dwo section.
503 void emitDebugStrDWO();
505 /// Flags to let the linker know we have emitted new style pubnames. Only
506 /// emit it here if we don't have a skeleton CU for split dwarf.
507 void addGnuPubAttributes(DwarfUnit &U, DIE &D) const;
509 /// Create new DwarfCompileUnit for the given metadata node with tag
510 /// DW_TAG_compile_unit.
511 DwarfCompileUnit &constructDwarfCompileUnit(const DICompileUnit *DIUnit);
513 /// Construct imported_module or imported_declaration DIE.
514 void constructAndAddImportedEntityDIE(DwarfCompileUnit &TheCU,
515 const DIImportedEntity *N);
517 /// Register a source line with debug info. Returns the unique
518 /// label that was emitted and which provides correspondence to the
519 /// source line list.
520 void recordSourceLine(unsigned Line, unsigned Col, const MDNode *Scope,
523 /// Indentify instructions that are marking the beginning of or
524 /// ending of a scope.
525 void identifyScopeMarkers();
527 /// Populate LexicalScope entries with variables' info.
528 void collectVariableInfo(DwarfCompileUnit &TheCU, const DISubprogram *SP,
529 DenseSet<InlinedVariable> &ProcessedVars);
531 /// Build the location list for all DBG_VALUEs in the
532 /// function that describe the same variable.
533 void buildLocationList(SmallVectorImpl<DebugLocEntry> &DebugLoc,
534 const DbgValueHistoryMap::InstrRanges &Ranges);
536 /// Collect variable information from the side table maintained
538 void collectVariableInfoFromMMITable(DenseSet<InlinedVariable> &P);
540 /// Ensure that a label will be emitted before MI.
541 void requestLabelBeforeInsn(const MachineInstr *MI) {
542 LabelsBeforeInsn.insert(std::make_pair(MI, nullptr));
545 /// Ensure that a label will be emitted after MI.
546 void requestLabelAfterInsn(const MachineInstr *MI) {
547 LabelsAfterInsn.insert(std::make_pair(MI, nullptr));
551 //===--------------------------------------------------------------------===//
552 // Main entry points.
554 DwarfDebug(AsmPrinter *A, Module *M);
556 ~DwarfDebug() override;
558 /// Emit all Dwarf sections that should come prior to the
562 /// Emit all Dwarf sections that should come after the content.
563 void endModule() override;
565 /// Gather pre-function debug information.
566 void beginFunction(const MachineFunction *MF) override;
568 /// Gather and emit post-function debug information.
569 void endFunction(const MachineFunction *MF) override;
571 /// Process beginning of an instruction.
572 void beginInstruction(const MachineInstr *MI) override;
574 /// Process end of an instruction.
575 void endInstruction() override;
577 /// Perform an MD5 checksum of \p Identifier and return the lower 64 bits.
578 static uint64_t makeTypeSignature(StringRef Identifier);
580 /// Add a DIE to the set of types that we're going to pull into
582 void addDwarfTypeUnitType(DwarfCompileUnit &CU, StringRef Identifier,
583 DIE &Die, const DICompositeType *CTy);
585 /// Add a label so that arange data can be generated for it.
586 void addArangeLabel(SymbolCU SCU) { ArangeLabels.push_back(SCU); }
588 /// For symbols that have a size designated (e.g. common symbols),
589 /// this tracks that size.
590 void setSymbolSize(const MCSymbol *Sym, uint64_t Size) override {
594 /// Returns whether to emit DW_AT_[MIPS_]linkage_name.
595 bool useLinkageNames() const { return UseLinkageNames; }
597 /// Returns whether to use DW_OP_GNU_push_tls_address, instead of the
598 /// standard DW_OP_form_tls_address opcode
599 bool useGNUTLSOpcode() const { return UseGNUTLSOpcode; }
601 /// \defgroup DebuggerTuning Predicates to tune DWARF for a given debugger.
603 /// Returns whether we are "tuning" for a given debugger.
605 bool tuneForGDB() const { return DebuggerTuning == DebuggerKind::GDB; }
606 bool tuneForLLDB() const { return DebuggerTuning == DebuggerKind::LLDB; }
607 bool tuneForSCE() const { return DebuggerTuning == DebuggerKind::SCE; }
610 // Experimental DWARF5 features.
612 /// Returns whether or not to emit tables that dwarf consumers can
613 /// use to accelerate lookup.
614 bool useDwarfAccelTables() const { return HasDwarfAccelTables; }
616 /// Returns whether or not to change the current debug info for the
617 /// split dwarf proposal support.
618 bool useSplitDwarf() const { return HasSplitDwarf; }
620 /// Returns the Dwarf Version.
621 unsigned getDwarfVersion() const { return DwarfVersion; }
623 /// Returns the previous CU that was being updated
624 const DwarfCompileUnit *getPrevCU() const { return PrevCU; }
625 void setPrevCU(const DwarfCompileUnit *PrevCU) { this->PrevCU = PrevCU; }
627 /// Returns the entries for the .debug_loc section.
628 const DebugLocStream &getDebugLocs() const { return DebugLocs; }
630 /// Emit an entry for the debug loc section. This can be used to
631 /// handle an entry that's going to be emitted into the debug loc section.
632 void emitDebugLocEntry(ByteStreamer &Streamer,
633 const DebugLocStream::Entry &Entry);
635 /// Emit the location for a debug loc entry, including the size header.
636 void emitDebugLocEntryLocation(const DebugLocStream::Entry &Entry);
638 /// Find the MDNode for the given reference.
639 template <typename T> T *resolve(TypedDINodeRef<T> Ref) const {
640 return Ref.resolve(TypeIdentifierMap);
643 /// Return the TypeIdentifierMap.
644 const DITypeIdentifierMap &getTypeIdentifierMap() const {
645 return TypeIdentifierMap;
648 /// Find the DwarfCompileUnit for the given CU Die.
649 DwarfCompileUnit *lookupUnit(const DIE *CU) const {
650 return CUDieMap.lookup(CU);
652 /// isSubprogramContext - Return true if Context is either a subprogram
653 /// or another context nested inside a subprogram.
654 bool isSubprogramContext(const MDNode *Context);
656 void addSubprogramNames(const DISubprogram *SP, DIE &Die);
658 AddressPool &getAddressPool() { return AddrPool; }
660 void addAccelName(StringRef Name, const DIE &Die);
662 void addAccelObjC(StringRef Name, const DIE &Die);
664 void addAccelNamespace(StringRef Name, const DIE &Die);
666 void addAccelType(StringRef Name, const DIE &Die, char Flags);
668 const MachineFunction *getCurrentFunction() const { return CurFn; }
670 iterator_range<ImportedEntityMap::const_iterator>
671 findImportedEntitiesForScope(const MDNode *Scope) const {
672 return make_range(std::equal_range(
673 ScopesWithImportedEntities.begin(), ScopesWithImportedEntities.end(),
674 std::pair<const MDNode *, const MDNode *>(Scope, nullptr),
678 /// A helper function to check whether the DIE for a given Scope is
679 /// going to be null.
680 bool isLexicalScopeDIENull(LexicalScope *Scope);
682 /// Return Label preceding the instruction.
683 MCSymbol *getLabelBeforeInsn(const MachineInstr *MI);
685 /// Return Label immediately following the instruction.
686 MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
688 // FIXME: Sink these functions down into DwarfFile/Dwarf*Unit.
690 SmallPtrSet<const MDNode *, 16> &getProcessedSPNodes() {
691 return ProcessedSPNodes;
694 } // End of namespace llvm