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 if (Var->getTag() == dwarf::DW_TAG_arg_variable)
160 return dwarf::DW_TAG_formal_parameter;
162 return dwarf::DW_TAG_variable;
164 /// Return true if DbgVariable is artificial.
165 bool isArtificial() const {
166 if (Var->isArtificial())
168 if (getType()->isArtificial())
173 bool isObjectPointer() const {
174 if (Var->isObjectPointer())
176 if (getType()->isObjectPointer())
181 bool hasComplexAddress() const {
182 assert(MInsn && "Expected DBG_VALUE, not MMI variable");
183 assert(FrameIndex.empty() && "Expected DBG_VALUE, not MMI variable");
185 (Expr.empty() || (Expr.size() == 1 && Expr.back()->getNumElements())) &&
186 "Invalid Expr for DBG_VALUE");
187 return !Expr.empty();
189 bool isBlockByrefVariable() const;
190 const DIType *getType() const;
193 /// Look in the DwarfDebug map for the MDNode that
194 /// corresponds to the reference.
195 template <typename T> T *resolve(TypedDINodeRef<T> Ref) const;
199 /// Helper used to pair up a symbol and its DWARF compile unit.
201 SymbolCU(DwarfCompileUnit *CU, const MCSymbol *Sym) : Sym(Sym), CU(CU) {}
203 DwarfCompileUnit *CU;
206 /// Identify a debugger for "tuning" the debug info.
208 /// The "debugger tuning" concept allows us to present a more intuitive
209 /// interface that unpacks into different sets of defaults for the various
210 /// individual feature-flag settings, that suit the preferences of the
211 /// various debuggers. However, it's worth remembering that debuggers are
212 /// not the only consumers of debug info, and some variations in DWARF might
213 /// better be treated as target/platform issues. Fundamentally,
214 /// o if the feature is useful (or not) to a particular debugger, regardless
215 /// of the target, that's a tuning decision;
216 /// o if the feature is useful (or not) on a particular platform, regardless
217 /// of the debugger, that's a target decision.
218 /// It's not impossible to see both factors in some specific case.
220 /// The "tuning" should be used to set defaults for individual feature flags
221 /// in DwarfDebug; if a given feature has a more specific command-line option,
222 /// that option should take precedence over the tuning.
223 enum class DebuggerKind {
224 Default, // No specific tuning requested.
225 GDB, // Tune debug info for gdb.
226 LLDB, // Tune debug info for lldb.
227 SCE // Tune debug info for SCE targets (e.g. PS4).
230 /// Collects and handles dwarf debug information.
231 class DwarfDebug : public AsmPrinterHandler {
232 /// Target of Dwarf emission.
235 /// Collected machine module information.
236 MachineModuleInfo *MMI;
238 /// All DIEValues are allocated through this allocator.
239 BumpPtrAllocator DIEValueAllocator;
241 /// Maps MDNode with its corresponding DwarfCompileUnit.
242 MapVector<const MDNode *, DwarfCompileUnit *> CUMap;
244 /// Maps subprogram MDNode with its corresponding DwarfCompileUnit.
245 MapVector<const MDNode *, DwarfCompileUnit *> SPMap;
247 /// Maps a CU DIE with its corresponding DwarfCompileUnit.
248 DenseMap<const DIE *, DwarfCompileUnit *> CUDieMap;
250 /// List of all labels used in aranges generation.
251 std::vector<SymbolCU> ArangeLabels;
253 /// Size of each symbol emitted (for those symbols that have a specific size).
254 DenseMap<const MCSymbol *, uint64_t> SymSize;
256 LexicalScopes LScopes;
258 /// Collection of abstract variables.
259 DenseMap<const MDNode *, std::unique_ptr<DbgVariable>> AbstractVariables;
260 SmallVector<std::unique_ptr<DbgVariable>, 64> ConcreteVariables;
262 /// Collection of DebugLocEntry. Stored in a linked list so that DIELocLists
263 /// can refer to them in spite of insertions into this list.
264 DebugLocStream DebugLocs;
266 /// This is a collection of subprogram MDNodes that are processed to
268 SmallPtrSet<const MDNode *, 16> ProcessedSPNodes;
270 /// Maps instruction with label emitted before instruction.
271 DenseMap<const MachineInstr *, MCSymbol *> LabelsBeforeInsn;
273 /// Maps instruction with label emitted after instruction.
274 DenseMap<const MachineInstr *, MCSymbol *> LabelsAfterInsn;
276 /// History of DBG_VALUE and clobber instructions for each user
277 /// variable. Variables are listed in order of appearance.
278 DbgValueHistoryMap DbgValues;
280 /// Previous instruction's location information. This is used to
281 /// determine label location to indicate scope boundries in dwarf
283 DebugLoc PrevInstLoc;
286 /// This location indicates end of function prologue and beginning of
288 DebugLoc PrologEndLoc;
290 /// If nonnull, stores the current machine function we're processing.
291 const MachineFunction *CurFn;
293 /// If nonnull, stores the current machine instruction we're processing.
294 const MachineInstr *CurMI;
296 /// If nonnull, stores the CU in which the previous subprogram was contained.
297 const DwarfCompileUnit *PrevCU;
299 /// As an optimization, there is no need to emit an entry in the directory
300 /// table for the same directory as DW_AT_comp_dir.
301 StringRef CompilationDir;
303 /// Holder for the file specific debug information.
304 DwarfFile InfoHolder;
306 /// Holders for the various debug information flags that we might need to
307 /// have exposed. See accessor functions below for description.
309 /// Holder for imported entities.
310 typedef SmallVector<std::pair<const MDNode *, const MDNode *>, 32>
312 ImportedEntityMap ScopesWithImportedEntities;
314 /// Map from MDNodes for user-defined types to the type units that
316 DenseMap<const MDNode *, const DwarfTypeUnit *> DwarfTypeUnits;
319 std::pair<std::unique_ptr<DwarfTypeUnit>, const DICompositeType *>, 1>
320 TypeUnitsUnderConstruction;
322 /// Whether to emit the pubnames/pubtypes sections.
323 bool HasDwarfPubSections;
325 /// Whether or not to use AT_ranges for compilation units.
328 /// Whether we emitted a function into a section other than the
330 bool UsedNonDefaultText;
332 /// Whether to use the GNU TLS opcode (instead of the standard opcode).
333 bool UseGNUTLSOpcode;
335 /// Version of dwarf we're emitting.
336 unsigned DwarfVersion;
338 /// Maps from a type identifier to the actual MDNode.
339 DITypeIdentifierMap TypeIdentifierMap;
341 /// DWARF5 Experimental Options
343 bool HasDwarfAccelTables;
346 /// Separated Dwarf Variables
347 /// In general these will all be for bits that are left in the
348 /// original object file, rather than things that are meant
349 /// to be in the .dwo sections.
351 /// Holder for the skeleton information.
352 DwarfFile SkeletonHolder;
354 /// Store file names for type units under fission in a line table
355 /// header that will be emitted into debug_line.dwo.
356 // FIXME: replace this with a map from comp_dir to table so that we
357 // can emit multiple tables during LTO each of which uses directory
358 // 0, referencing the comp_dir of all the type units that use it.
359 MCDwarfDwoLineTable SplitTypeUnitFileTable;
362 /// True iff there are multiple CUs in this module.
366 AddressPool AddrPool;
368 DwarfAccelTable AccelNames;
369 DwarfAccelTable AccelObjC;
370 DwarfAccelTable AccelNamespace;
371 DwarfAccelTable AccelTypes;
373 DenseMap<const Function *, DISubprogram *> FunctionDIs;
375 // Identify a debugger for "tuning" the debug info.
376 DebuggerKind DebuggerTuning;
378 MCDwarfDwoLineTable *getDwoLineTable(const DwarfCompileUnit &);
380 const SmallVectorImpl<std::unique_ptr<DwarfUnit>> &getUnits() {
381 return InfoHolder.getUnits();
384 typedef DbgValueHistoryMap::InlinedVariable InlinedVariable;
386 /// Find abstract variable associated with Var.
387 DbgVariable *getExistingAbstractVariable(InlinedVariable IV,
388 const DILocalVariable *&Cleansed);
389 DbgVariable *getExistingAbstractVariable(InlinedVariable IV);
390 void createAbstractVariable(const DILocalVariable *DV, LexicalScope *Scope);
391 void ensureAbstractVariableIsCreated(InlinedVariable Var,
392 const MDNode *Scope);
393 void ensureAbstractVariableIsCreatedIfScoped(InlinedVariable Var,
394 const MDNode *Scope);
396 DbgVariable *createConcreteVariable(LexicalScope &Scope, InlinedVariable IV);
398 /// Construct a DIE for this abstract scope.
399 void constructAbstractSubprogramScopeDIE(LexicalScope *Scope);
401 /// Compute the size and offset of a DIE given an incoming Offset.
402 unsigned computeSizeAndOffset(DIE *Die, unsigned Offset);
404 /// Compute the size and offset of all the DIEs.
405 void computeSizeAndOffsets();
407 /// Collect info for variables that were optimized out.
408 void collectDeadVariables();
410 void finishVariableDefinitions();
412 void finishSubprogramDefinitions();
414 /// Finish off debug information after all functions have been
416 void finalizeModuleInfo();
418 /// Emit the debug info section.
419 void emitDebugInfo();
421 /// Emit the abbreviation section.
422 void emitAbbreviations();
424 /// Emit a specified accelerator table.
425 void emitAccel(DwarfAccelTable &Accel, MCSection *Section,
426 StringRef TableName);
428 /// Emit visible names into a hashed accelerator table section.
429 void emitAccelNames();
431 /// Emit objective C classes and categories into a hashed
432 /// accelerator table section.
433 void emitAccelObjC();
435 /// Emit namespace dies into a hashed accelerator table.
436 void emitAccelNamespaces();
438 /// Emit type dies into a hashed accelerator table.
439 void emitAccelTypes();
441 /// Emit visible names into a debug pubnames section.
442 /// \param GnuStyle determines whether or not we want to emit
443 /// additional information into the table ala newer gcc for gdb
445 void emitDebugPubNames(bool GnuStyle = false);
447 /// Emit visible types into a debug pubtypes section.
448 /// \param GnuStyle determines whether or not we want to emit
449 /// additional information into the table ala newer gcc for gdb
451 void emitDebugPubTypes(bool GnuStyle = false);
453 void emitDebugPubSection(
454 bool GnuStyle, MCSection *PSec, StringRef Name,
455 const StringMap<const DIE *> &(DwarfCompileUnit::*Accessor)() const);
457 /// Emit visible names into a debug str section.
460 /// Emit visible names into a debug loc section.
463 /// Emit visible names into a debug loc dwo section.
464 void emitDebugLocDWO();
466 /// Emit visible names into a debug aranges section.
467 void emitDebugARanges();
469 /// Emit visible names into a debug ranges section.
470 void emitDebugRanges();
472 /// Emit inline info using custom format.
473 void emitDebugInlineInfo();
475 /// DWARF 5 Experimental Split Dwarf Emitters
477 /// Initialize common features of skeleton units.
478 void initSkeletonUnit(const DwarfUnit &U, DIE &Die,
479 std::unique_ptr<DwarfUnit> NewU);
481 /// Construct the split debug info compile unit for the debug info
483 DwarfCompileUnit &constructSkeletonCU(const DwarfCompileUnit &CU);
485 /// Construct the split debug info compile unit for the debug info
487 DwarfTypeUnit &constructSkeletonTU(DwarfTypeUnit &TU);
489 /// Emit the debug info dwo section.
490 void emitDebugInfoDWO();
492 /// Emit the debug abbrev dwo section.
493 void emitDebugAbbrevDWO();
495 /// Emit the debug line dwo section.
496 void emitDebugLineDWO();
498 /// Emit the debug str dwo section.
499 void emitDebugStrDWO();
501 /// Flags to let the linker know we have emitted new style pubnames. Only
502 /// emit it here if we don't have a skeleton CU for split dwarf.
503 void addGnuPubAttributes(DwarfUnit &U, DIE &D) const;
505 /// Create new DwarfCompileUnit for the given metadata node with tag
506 /// DW_TAG_compile_unit.
507 DwarfCompileUnit &constructDwarfCompileUnit(const DICompileUnit *DIUnit);
509 /// Construct imported_module or imported_declaration DIE.
510 void constructAndAddImportedEntityDIE(DwarfCompileUnit &TheCU,
511 const DIImportedEntity *N);
513 /// Register a source line with debug info. Returns the unique
514 /// label that was emitted and which provides correspondence to the
515 /// source line list.
516 void recordSourceLine(unsigned Line, unsigned Col, const MDNode *Scope,
519 /// Indentify instructions that are marking the beginning of or
520 /// ending of a scope.
521 void identifyScopeMarkers();
523 /// Populate LexicalScope entries with variables' info.
524 void collectVariableInfo(DwarfCompileUnit &TheCU, const DISubprogram *SP,
525 DenseSet<InlinedVariable> &ProcessedVars);
527 /// Build the location list for all DBG_VALUEs in the
528 /// function that describe the same variable.
529 void buildLocationList(SmallVectorImpl<DebugLocEntry> &DebugLoc,
530 const DbgValueHistoryMap::InstrRanges &Ranges);
532 /// Collect variable information from the side table maintained
534 void collectVariableInfoFromMMITable(DenseSet<InlinedVariable> &P);
536 /// Ensure that a label will be emitted before MI.
537 void requestLabelBeforeInsn(const MachineInstr *MI) {
538 LabelsBeforeInsn.insert(std::make_pair(MI, nullptr));
541 /// Ensure that a label will be emitted after MI.
542 void requestLabelAfterInsn(const MachineInstr *MI) {
543 LabelsAfterInsn.insert(std::make_pair(MI, nullptr));
547 //===--------------------------------------------------------------------===//
548 // Main entry points.
550 DwarfDebug(AsmPrinter *A, Module *M);
552 ~DwarfDebug() override;
554 /// Emit all Dwarf sections that should come prior to the
558 /// Emit all Dwarf sections that should come after the content.
559 void endModule() override;
561 /// Gather pre-function debug information.
562 void beginFunction(const MachineFunction *MF) override;
564 /// Gather and emit post-function debug information.
565 void endFunction(const MachineFunction *MF) override;
567 /// Process beginning of an instruction.
568 void beginInstruction(const MachineInstr *MI) override;
570 /// Process end of an instruction.
571 void endInstruction() override;
573 /// Perform an MD5 checksum of \p Identifier and return the lower 64 bits.
574 static uint64_t makeTypeSignature(StringRef Identifier);
576 /// Add a DIE to the set of types that we're going to pull into
578 void addDwarfTypeUnitType(DwarfCompileUnit &CU, StringRef Identifier,
579 DIE &Die, const DICompositeType *CTy);
581 /// Add a label so that arange data can be generated for it.
582 void addArangeLabel(SymbolCU SCU) { ArangeLabels.push_back(SCU); }
584 /// For symbols that have a size designated (e.g. common symbols),
585 /// this tracks that size.
586 void setSymbolSize(const MCSymbol *Sym, uint64_t Size) override {
590 /// Returns whether to use DW_OP_GNU_push_tls_address, instead of the
591 /// standard DW_OP_form_tls_address opcode
592 bool useGNUTLSOpcode() const { return UseGNUTLSOpcode; }
594 /// \defgroup DebuggerTuning Predicates to tune DWARF for a given debugger.
596 /// Returns whether we are "tuning" for a given debugger.
598 bool tuneForGDB() const { return DebuggerTuning == DebuggerKind::GDB; }
599 bool tuneForLLDB() const { return DebuggerTuning == DebuggerKind::LLDB; }
600 bool tuneForSCE() const { return DebuggerTuning == DebuggerKind::SCE; }
603 // Experimental DWARF5 features.
605 /// Returns whether or not to emit tables that dwarf consumers can
606 /// use to accelerate lookup.
607 bool useDwarfAccelTables() const { return HasDwarfAccelTables; }
609 /// Returns whether or not to change the current debug info for the
610 /// split dwarf proposal support.
611 bool useSplitDwarf() const { return HasSplitDwarf; }
613 /// Returns the Dwarf Version.
614 unsigned getDwarfVersion() const { return DwarfVersion; }
616 /// Returns the previous CU that was being updated
617 const DwarfCompileUnit *getPrevCU() const { return PrevCU; }
618 void setPrevCU(const DwarfCompileUnit *PrevCU) { this->PrevCU = PrevCU; }
620 /// Returns the entries for the .debug_loc section.
621 const DebugLocStream &getDebugLocs() const { return DebugLocs; }
623 /// Emit an entry for the debug loc section. This can be used to
624 /// handle an entry that's going to be emitted into the debug loc section.
625 void emitDebugLocEntry(ByteStreamer &Streamer,
626 const DebugLocStream::Entry &Entry);
628 /// Emit the location for a debug loc entry, including the size header.
629 void emitDebugLocEntryLocation(const DebugLocStream::Entry &Entry);
631 /// Find the MDNode for the given reference.
632 template <typename T> T *resolve(TypedDINodeRef<T> Ref) const {
633 return Ref.resolve(TypeIdentifierMap);
636 /// Return the TypeIdentifierMap.
637 const DITypeIdentifierMap &getTypeIdentifierMap() const {
638 return TypeIdentifierMap;
641 /// Find the DwarfCompileUnit for the given CU Die.
642 DwarfCompileUnit *lookupUnit(const DIE *CU) const {
643 return CUDieMap.lookup(CU);
645 /// isSubprogramContext - Return true if Context is either a subprogram
646 /// or another context nested inside a subprogram.
647 bool isSubprogramContext(const MDNode *Context);
649 void addSubprogramNames(const DISubprogram *SP, DIE &Die);
651 AddressPool &getAddressPool() { return AddrPool; }
653 void addAccelName(StringRef Name, const DIE &Die);
655 void addAccelObjC(StringRef Name, const DIE &Die);
657 void addAccelNamespace(StringRef Name, const DIE &Die);
659 void addAccelType(StringRef Name, const DIE &Die, char Flags);
661 const MachineFunction *getCurrentFunction() const { return CurFn; }
663 iterator_range<ImportedEntityMap::const_iterator>
664 findImportedEntitiesForScope(const MDNode *Scope) const {
665 return make_range(std::equal_range(
666 ScopesWithImportedEntities.begin(), ScopesWithImportedEntities.end(),
667 std::pair<const MDNode *, const MDNode *>(Scope, nullptr),
671 /// A helper function to check whether the DIE for a given Scope is
672 /// going to be null.
673 bool isLexicalScopeDIENull(LexicalScope *Scope);
675 /// Return Label preceding the instruction.
676 MCSymbol *getLabelBeforeInsn(const MachineInstr *MI);
678 /// Return Label immediately following the instruction.
679 MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
681 // FIXME: Sink these functions down into DwarfFile/Dwarf*Unit.
683 SmallPtrSet<const MDNode *, 16> &getProcessedSPNodes() {
684 return ProcessedSPNodes;
687 } // End of namespace llvm