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 "DwarfFile.h"
18 #include "AsmPrinterHandler.h"
20 #include "DbgValueHistoryCalculator.h"
21 #include "DebugLocEntry.h"
22 #include "DebugLocList.h"
23 #include "DwarfAccelTable.h"
24 #include "llvm/ADT/DenseMap.h"
25 #include "llvm/ADT/MapVector.h"
26 #include "llvm/ADT/SmallPtrSet.h"
27 #include "llvm/ADT/StringMap.h"
28 #include "llvm/ADT/FoldingSet.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/MachineLocation.h"
34 #include "llvm/MC/MCDwarf.h"
35 #include "llvm/Support/Allocator.h"
45 class DwarfCompileUnit;
49 class MachineModuleInfo;
51 //===----------------------------------------------------------------------===//
52 /// \brief 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 /// \brief This class is used to track local variable information.
72 DIVariable Var; // Variable Descriptor.
73 DIExpression Expr; // Complex address location expression.
74 DIE *TheDIE; // Variable DIE.
75 unsigned DotDebugLocOffset; // Offset in DotDebugLocEntries.
76 const MachineInstr *MInsn; // DBG_VALUE instruction of the variable.
81 /// Construct a DbgVariable from a DIVariable.
82 DbgVariable(DIVariable V, DIExpression E, DwarfDebug *DD)
83 : Var(V), Expr(E), TheDIE(nullptr), DotDebugLocOffset(~0U),
84 MInsn(nullptr), FrameIndex(~0), DD(DD) {
85 assert(Var.Verify() && Expr.Verify());
88 /// Construct a DbgVariable from a DEBUG_VALUE.
89 /// AbstractVar may be NULL.
90 DbgVariable(const MachineInstr *DbgValue, DwarfDebug *DD)
91 : Var(DbgValue->getDebugVariable()), Expr(DbgValue->getDebugExpression()),
92 TheDIE(nullptr), DotDebugLocOffset(~0U), MInsn(DbgValue),
93 FrameIndex(~0), DD(DD) {}
96 DIVariable getVariable() const { return Var; }
97 DIExpression getExpression() const { return Expr; }
98 void setDIE(DIE &D) { TheDIE = &D; }
99 DIE *getDIE() const { return TheDIE; }
100 void setDotDebugLocOffset(unsigned O) { DotDebugLocOffset = O; }
101 unsigned getDotDebugLocOffset() const { return DotDebugLocOffset; }
102 StringRef getName() const { return Var.getName(); }
103 const MachineInstr *getMInsn() const { return MInsn; }
104 int getFrameIndex() const { return FrameIndex; }
105 void setFrameIndex(int FI) { FrameIndex = FI; }
106 // Translate tag to proper Dwarf tag.
107 dwarf::Tag getTag() const {
108 if (Var.getTag() == dwarf::DW_TAG_arg_variable)
109 return dwarf::DW_TAG_formal_parameter;
111 return dwarf::DW_TAG_variable;
113 /// \brief Return true if DbgVariable is artificial.
114 bool isArtificial() const {
115 if (Var.isArtificial())
117 if (getType().isArtificial())
122 bool isObjectPointer() const {
123 if (Var.isObjectPointer())
125 if (getType().isObjectPointer())
130 bool variableHasComplexAddress() const {
131 assert(Var.isVariable() && "Invalid complex DbgVariable!");
132 return Expr.getNumElements() > 0;
134 bool isBlockByrefVariable() const;
135 unsigned getNumAddrElements() const {
136 assert(Var.isVariable() && "Invalid complex DbgVariable!");
137 return Expr.getNumElements();
139 uint64_t getAddrElement(unsigned i) const { return Expr.getElement(i); }
140 DIType getType() const;
143 /// resolve - Look in the DwarfDebug map for the MDNode that
144 /// corresponds to the reference.
145 template <typename T> T resolve(DIRef<T> Ref) const;
149 /// \brief Helper used to pair up a symbol and its DWARF compile unit.
151 SymbolCU(DwarfCompileUnit *CU, const MCSymbol *Sym) : Sym(Sym), CU(CU) {}
153 DwarfCompileUnit *CU;
156 /// \brief Collects and handles dwarf debug information.
157 class DwarfDebug : public AsmPrinterHandler {
158 // Target of Dwarf emission.
161 // Collected machine module information.
162 MachineModuleInfo *MMI;
164 // All DIEValues are allocated through this allocator.
165 BumpPtrAllocator DIEValueAllocator;
167 // Handle to the compile unit used for the inline extension handling,
168 // this is just so that the DIEValue allocator has a place to store
169 // the particular elements.
170 // FIXME: Store these off of DwarfDebug instead?
171 DwarfCompileUnit *FirstCU;
173 // Maps MDNode with its corresponding DwarfCompileUnit.
174 MapVector<const MDNode *, DwarfCompileUnit *> CUMap;
176 // Maps subprogram MDNode with its corresponding DwarfCompileUnit.
177 DenseMap<const MDNode *, DwarfCompileUnit *> SPMap;
179 // Maps a CU DIE with its corresponding DwarfCompileUnit.
180 DenseMap<const DIE *, DwarfCompileUnit *> CUDieMap;
182 /// Maps MDNodes for type system with the corresponding DIEs. These DIEs can
183 /// be shared across CUs, that is why we keep the map here instead
184 /// of in DwarfCompileUnit.
185 DenseMap<const MDNode *, DIE *> MDTypeNodeToDieMap;
187 // List of all labels used in aranges generation.
188 std::vector<SymbolCU> ArangeLabels;
190 // Size of each symbol emitted (for those symbols that have a specific size).
191 DenseMap<const MCSymbol *, uint64_t> SymSize;
193 // Provides a unique id per text section.
194 typedef DenseMap<const MCSection *, SmallVector<SymbolCU, 8> > SectionMapType;
195 SectionMapType SectionMap;
197 // List of arguments for current function.
198 SmallVector<DbgVariable *, 8> CurrentFnArguments;
200 LexicalScopes LScopes;
202 // Collection of abstract subprogram DIEs.
203 DenseMap<const MDNode *, DIE *> AbstractSPDies;
205 // Collection of dbg variables of a scope.
206 typedef DenseMap<LexicalScope *, SmallVector<DbgVariable *, 8> >
208 ScopeVariablesMap ScopeVariables;
210 // Collection of abstract variables.
211 DenseMap<const MDNode *, std::unique_ptr<DbgVariable>> AbstractVariables;
212 SmallVector<std::unique_ptr<DbgVariable>, 64> ConcreteVariables;
214 // Collection of DebugLocEntry. Stored in a linked list so that DIELocLists
215 // can refer to them in spite of insertions into this list.
216 SmallVector<DebugLocList, 4> DotDebugLocEntries;
218 // Collection of subprogram DIEs that are marked (at the end of the module)
220 SmallPtrSet<DIE *, 4> InlinedSubprogramDIEs;
222 // This is a collection of subprogram MDNodes that are processed to
224 SmallPtrSet<const MDNode *, 16> ProcessedSPNodes;
226 // Maps instruction with label emitted before instruction.
227 DenseMap<const MachineInstr *, MCSymbol *> LabelsBeforeInsn;
229 // Maps instruction with label emitted after instruction.
230 DenseMap<const MachineInstr *, MCSymbol *> LabelsAfterInsn;
232 // History of DBG_VALUE and clobber instructions for each user variable.
233 // Variables are listed in order of appearance.
234 DbgValueHistoryMap DbgValues;
236 // Previous instruction's location information. This is used to determine
237 // label location to indicate scope boundries in dwarf debug info.
238 DebugLoc PrevInstLoc;
241 // This location indicates end of function prologue and beginning of function
243 DebugLoc PrologEndLoc;
245 // If nonnull, stores the current machine function we're processing.
246 const MachineFunction *CurFn;
248 // If nonnull, stores the current machine instruction we're processing.
249 const MachineInstr *CurMI;
251 // If nonnull, stores the CU in which the previous subprogram was contained.
252 const DwarfCompileUnit *PrevCU;
254 // Section Symbols: these are assembler temporary labels that are emitted at
255 // the beginning of each supported dwarf section. These are used to form
256 // section offsets and are created by EmitSectionLabels.
257 MCSymbol *DwarfInfoSectionSym, *DwarfAbbrevSectionSym;
258 MCSymbol *DwarfStrSectionSym, *TextSectionSym, *DwarfDebugRangeSectionSym;
259 MCSymbol *DwarfDebugLocSectionSym, *DwarfLineSectionSym, *DwarfAddrSectionSym;
260 MCSymbol *FunctionBeginSym, *FunctionEndSym;
261 MCSymbol *DwarfInfoDWOSectionSym, *DwarfAbbrevDWOSectionSym;
262 MCSymbol *DwarfTypesDWOSectionSym;
263 MCSymbol *DwarfStrDWOSectionSym;
264 MCSymbol *DwarfGnuPubNamesSectionSym, *DwarfGnuPubTypesSectionSym;
266 // As an optimization, there is no need to emit an entry in the directory
267 // table for the same directory as DW_AT_comp_dir.
268 StringRef CompilationDir;
270 // Counter for assigning globally unique IDs for ranges.
271 unsigned GlobalRangeCount;
273 // Holder for the file specific debug information.
274 DwarfFile InfoHolder;
276 // Holders for the various debug information flags that we might need to
277 // have exposed. See accessor functions below for description.
279 // Holder for imported entities.
280 typedef SmallVector<std::pair<const MDNode *, const MDNode *>, 32>
282 ImportedEntityMap ScopesWithImportedEntities;
284 // Map from MDNodes for user-defined types to the type units that describe
286 DenseMap<const MDNode *, const DwarfTypeUnit *> DwarfTypeUnits;
288 SmallVector<std::pair<std::unique_ptr<DwarfTypeUnit>, DICompositeType>, 1> TypeUnitsUnderConstruction;
290 // Whether to emit the pubnames/pubtypes sections.
291 bool HasDwarfPubSections;
293 // Whether or not to use AT_ranges for compilation units.
296 // Whether we emitted a function into a section other than the default
298 bool UsedNonDefaultText;
300 // Version of dwarf we're emitting.
301 unsigned DwarfVersion;
303 // Maps from a type identifier to the actual MDNode.
304 DITypeIdentifierMap TypeIdentifierMap;
306 // DWARF5 Experimental Options
307 bool HasDwarfAccelTables;
310 // Separated Dwarf Variables
311 // In general these will all be for bits that are left in the
312 // original object file, rather than things that are meant
313 // to be in the .dwo sections.
315 // Holder for the skeleton information.
316 DwarfFile SkeletonHolder;
318 /// Store file names for type units under fission in a line table header that
319 /// will be emitted into debug_line.dwo.
320 // FIXME: replace this with a map from comp_dir to table so that we can emit
321 // multiple tables during LTO each of which uses directory 0, referencing the
322 // comp_dir of all the type units that use it.
323 MCDwarfDwoLineTable SplitTypeUnitFileTable;
325 // True iff there are multiple CUs in this module.
329 AddressPool AddrPool;
331 DwarfAccelTable AccelNames;
332 DwarfAccelTable AccelObjC;
333 DwarfAccelTable AccelNamespace;
334 DwarfAccelTable AccelTypes;
336 DenseMap<const Function *, DISubprogram> FunctionDIs;
338 MCDwarfDwoLineTable *getDwoLineTable(const DwarfCompileUnit &);
340 void addScopeVariable(LexicalScope *LS, DbgVariable *Var);
342 const SmallVectorImpl<std::unique_ptr<DwarfUnit>> &getUnits() {
343 return InfoHolder.getUnits();
346 /// \brief Find abstract variable associated with Var.
347 DbgVariable *getExistingAbstractVariable(const DIVariable &DV,
348 DIVariable &Cleansed);
349 DbgVariable *getExistingAbstractVariable(const DIVariable &DV);
350 void createAbstractVariable(const DIVariable &DV, LexicalScope *Scope);
351 void ensureAbstractVariableIsCreated(const DIVariable &Var,
352 const MDNode *Scope);
353 void ensureAbstractVariableIsCreatedIfScoped(const DIVariable &Var,
354 const MDNode *Scope);
356 /// \brief Find DIE for the given subprogram and attach appropriate
357 /// DW_AT_low_pc and DW_AT_high_pc attributes. If there are global
358 /// variables in this scope then create and insert DIEs for these
360 DIE &updateSubprogramScopeDIE(DwarfCompileUnit &SPCU, DISubprogram SP);
362 /// \brief A helper function to check whether the DIE for a given Scope is
363 /// going to be null.
364 bool isLexicalScopeDIENull(LexicalScope *Scope);
366 /// \brief A helper function to construct a RangeSpanList for a given
368 void addScopeRangeList(DwarfCompileUnit &TheCU, DIE &ScopeDIE,
369 const SmallVectorImpl<InsnRange> &Range);
371 /// \brief Construct new DW_TAG_lexical_block for this scope and
372 /// attach DW_AT_low_pc/DW_AT_high_pc labels.
373 std::unique_ptr<DIE> constructLexicalScopeDIE(DwarfCompileUnit &TheCU,
374 LexicalScope *Scope);
376 /// \brief This scope represents inlined body of a function. Construct
377 /// DIE to represent this concrete inlined copy of the function.
378 std::unique_ptr<DIE> constructInlinedScopeDIE(DwarfCompileUnit &TheCU,
379 LexicalScope *Scope);
381 /// \brief Construct a DIE for this scope.
382 void constructScopeDIE(DwarfCompileUnit &TheCU, LexicalScope *Scope,
383 SmallVectorImpl<std::unique_ptr<DIE>> &FinalChildren);
384 DIE *createAndAddScopeChildren(DwarfCompileUnit &TheCU, LexicalScope *Scope,
386 /// \brief Construct a DIE for this abstract scope.
387 void constructAbstractSubprogramScopeDIE(DwarfCompileUnit &TheCU,
388 LexicalScope *Scope);
389 /// \brief Construct a DIE for this subprogram scope.
390 void constructSubprogramScopeDIE(DwarfCompileUnit &TheCU,
391 LexicalScope *Scope);
392 /// A helper function to create children of a Scope DIE.
393 DIE *createScopeChildrenDIE(DwarfCompileUnit &TheCU, LexicalScope *Scope,
394 SmallVectorImpl<std::unique_ptr<DIE>> &Children,
395 unsigned *ChildScopeCount = nullptr);
397 /// \brief Emit initial Dwarf sections with a label at the start of each one.
398 void emitSectionLabels();
400 /// \brief Compute the size and offset of a DIE given an incoming Offset.
401 unsigned computeSizeAndOffset(DIE *Die, unsigned Offset);
403 /// \brief Compute the size and offset of all the DIEs.
404 void computeSizeAndOffsets();
406 /// \brief Collect info for variables that were optimized out.
407 void collectDeadVariables();
409 void finishVariableDefinitions();
411 void finishSubprogramDefinitions();
413 /// \brief Finish off debug information after all functions have been
415 void finalizeModuleInfo();
417 /// \brief Emit labels to close any remaining sections that have been left
421 /// \brief Emit the debug info section.
422 void emitDebugInfo();
424 /// \brief Emit the abbreviation section.
425 void emitAbbreviations();
427 /// \brief Emit the last address of the section and the end of
429 void emitEndOfLineMatrix(unsigned SectionEnd);
431 /// \brief Emit a specified accelerator table.
432 void emitAccel(DwarfAccelTable &Accel, const MCSection *Section,
433 StringRef TableName, StringRef SymName);
435 /// \brief Emit visible names into a hashed accelerator table section.
436 void emitAccelNames();
438 /// \brief Emit objective C classes and categories into a hashed
439 /// accelerator table section.
440 void emitAccelObjC();
442 /// \brief Emit namespace dies into a hashed accelerator table.
443 void emitAccelNamespaces();
445 /// \brief Emit type dies into a hashed accelerator table.
446 void emitAccelTypes();
448 /// \brief Emit visible names into a debug pubnames section.
449 /// \param GnuStyle determines whether or not we want to emit
450 /// additional information into the table ala newer gcc for gdb
452 void emitDebugPubNames(bool GnuStyle = false);
454 /// \brief Emit visible types into a debug pubtypes section.
455 /// \param GnuStyle determines whether or not we want to emit
456 /// additional information into the table ala newer gcc for gdb
458 void emitDebugPubTypes(bool GnuStyle = false);
461 emitDebugPubSection(bool GnuStyle, const MCSection *PSec, StringRef Name,
462 const StringMap<const DIE *> &(DwarfUnit::*Accessor)()
465 /// \brief Emit visible names into a debug str section.
468 /// \brief Emit visible names into a debug loc section.
471 /// \brief Emit visible names into a debug loc dwo section.
472 void emitDebugLocDWO();
474 /// \brief Emit visible names into a debug aranges section.
475 void emitDebugARanges();
477 /// \brief Emit visible names into a debug ranges section.
478 void emitDebugRanges();
480 /// \brief Emit inline info using custom format.
481 void emitDebugInlineInfo();
483 /// DWARF 5 Experimental Split Dwarf Emitters
485 /// \brief Initialize common features of skeleton units.
486 void initSkeletonUnit(const DwarfUnit &U, DIE &Die,
487 std::unique_ptr<DwarfUnit> NewU);
489 /// \brief Construct the split debug info compile unit for the debug info
491 DwarfCompileUnit &constructSkeletonCU(const DwarfCompileUnit &CU);
493 /// \brief Construct the split debug info compile unit for the debug info
495 DwarfTypeUnit &constructSkeletonTU(DwarfTypeUnit &TU);
497 /// \brief Emit the debug info dwo section.
498 void emitDebugInfoDWO();
500 /// \brief Emit the debug abbrev dwo section.
501 void emitDebugAbbrevDWO();
503 /// \brief Emit the debug line dwo section.
504 void emitDebugLineDWO();
506 /// \brief Emit the debug str dwo section.
507 void emitDebugStrDWO();
509 /// Flags to let the linker know we have emitted new style pubnames. Only
510 /// emit it here if we don't have a skeleton CU for split dwarf.
511 void addGnuPubAttributes(DwarfUnit &U, DIE &D) const;
513 /// \brief Create new DwarfCompileUnit for the given metadata node with tag
514 /// DW_TAG_compile_unit.
515 DwarfCompileUnit &constructDwarfCompileUnit(DICompileUnit DIUnit);
517 /// \brief Construct imported_module or imported_declaration DIE.
518 void constructAndAddImportedEntityDIE(DwarfCompileUnit &TheCU,
521 /// \brief Construct import_module DIE.
523 constructImportedEntityDIE(DwarfCompileUnit &TheCU,
524 const DIImportedEntity &Module);
526 /// \brief Register a source line with debug info. Returns the unique
527 /// label that was emitted and which provides correspondence to the
528 /// source line list.
529 void recordSourceLine(unsigned Line, unsigned Col, const MDNode *Scope,
532 /// \brief Indentify instructions that are marking the beginning of or
533 /// ending of a scope.
534 void identifyScopeMarkers();
536 /// \brief If Var is an current function argument that add it in
537 /// CurrentFnArguments list.
538 bool addCurrentFnArgument(DbgVariable *Var, LexicalScope *Scope);
540 /// \brief Populate LexicalScope entries with variables' info.
541 void collectVariableInfo(SmallPtrSetImpl<const MDNode *> &ProcessedVars);
543 /// \brief Build the location list for all DBG_VALUEs in the
544 /// function that describe the same variable.
545 void buildLocationList(SmallVectorImpl<DebugLocEntry> &DebugLoc,
546 const DbgValueHistoryMap::InstrRanges &Ranges);
548 /// \brief Collect variable information from the side table maintained
550 void collectVariableInfoFromMMITable(SmallPtrSetImpl<const MDNode *> &P);
552 /// \brief Ensure that a label will be emitted before MI.
553 void requestLabelBeforeInsn(const MachineInstr *MI) {
554 LabelsBeforeInsn.insert(std::make_pair(MI, nullptr));
557 /// \brief Return Label preceding the instruction.
558 MCSymbol *getLabelBeforeInsn(const MachineInstr *MI);
560 /// \brief Ensure that a label will be emitted after MI.
561 void requestLabelAfterInsn(const MachineInstr *MI) {
562 LabelsAfterInsn.insert(std::make_pair(MI, nullptr));
565 /// \brief Return Label immediately following the instruction.
566 MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
568 void attachRangesOrLowHighPC(DwarfCompileUnit &Unit, DIE &D,
569 const SmallVectorImpl<InsnRange> &Ranges);
570 void attachLowHighPC(DwarfCompileUnit &Unit, DIE &D, const MCSymbol *Begin,
571 const MCSymbol *End);
574 //===--------------------------------------------------------------------===//
575 // Main entry points.
577 DwarfDebug(AsmPrinter *A, Module *M);
579 ~DwarfDebug() override;
581 void insertDIE(const MDNode *TypeMD, DIE *Die) {
582 MDTypeNodeToDieMap.insert(std::make_pair(TypeMD, Die));
584 DIE *getDIE(const MDNode *TypeMD) {
585 return MDTypeNodeToDieMap.lookup(TypeMD);
588 /// \brief Emit all Dwarf sections that should come prior to the
592 /// \brief Emit all Dwarf sections that should come after the content.
593 void endModule() override;
595 /// \brief Gather pre-function debug information.
596 void beginFunction(const MachineFunction *MF) override;
598 /// \brief Gather and emit post-function debug information.
599 void endFunction(const MachineFunction *MF) override;
601 /// \brief Process beginning of an instruction.
602 void beginInstruction(const MachineInstr *MI) override;
604 /// \brief Process end of an instruction.
605 void endInstruction() override;
607 /// \brief Add a DIE to the set of types that we're going to pull into
609 void addDwarfTypeUnitType(DwarfCompileUnit &CU, StringRef Identifier,
610 DIE &Die, DICompositeType CTy);
612 /// \brief Add a label so that arange data can be generated for it.
613 void addArangeLabel(SymbolCU SCU) { ArangeLabels.push_back(SCU); }
615 /// \brief For symbols that have a size designated (e.g. common symbols),
616 /// this tracks that size.
617 void setSymbolSize(const MCSymbol *Sym, uint64_t Size) override {
621 /// \brief Recursively Emits a debug information entry.
622 void emitDIE(DIE &Die);
624 // Experimental DWARF5 features.
626 /// \brief Returns whether or not to emit tables that dwarf consumers can
627 /// use to accelerate lookup.
628 bool useDwarfAccelTables() const { return HasDwarfAccelTables; }
630 /// \brief Returns whether or not to change the current debug info for the
631 /// split dwarf proposal support.
632 bool useSplitDwarf() const { return HasSplitDwarf; }
634 /// Returns the Dwarf Version.
635 unsigned getDwarfVersion() const { return DwarfVersion; }
637 /// Returns the section symbol for the .debug_loc section.
638 MCSymbol *getDebugLocSym() const { return DwarfDebugLocSectionSym; }
640 /// Returns the section symbol for the .debug_str section.
641 MCSymbol *getDebugStrSym() const { return DwarfStrSectionSym; }
643 /// Returns the previous CU that was being updated
644 const DwarfCompileUnit *getPrevCU() const { return PrevCU; }
645 void setPrevCU(const DwarfCompileUnit *PrevCU) { this->PrevCU = PrevCU; }
647 /// Returns the entries for the .debug_loc section.
648 const SmallVectorImpl<DebugLocList> &
649 getDebugLocEntries() const {
650 return DotDebugLocEntries;
653 /// \brief Emit an entry for the debug loc section. This can be used to
654 /// handle an entry that's going to be emitted into the debug loc section.
655 void emitDebugLocEntry(ByteStreamer &Streamer, const DebugLocEntry &Entry);
656 /// \brief emit a single value for the debug loc section.
657 void emitDebugLocValue(ByteStreamer &Streamer,
658 const DebugLocEntry::Value &Value);
659 /// Emits an optimal (=sorted) sequence of DW_OP_pieces.
660 void emitLocPieces(ByteStreamer &Streamer,
661 const DITypeIdentifierMap &Map,
662 ArrayRef<DebugLocEntry::Value> Values);
664 /// Emit the location for a debug loc entry, including the size header.
665 void emitDebugLocEntryLocation(const DebugLocEntry &Entry);
667 /// Find the MDNode for the given reference.
668 template <typename T> T resolve(DIRef<T> Ref) const {
669 return Ref.resolve(TypeIdentifierMap);
672 /// \brief Return the TypeIdentifierMap.
673 const DITypeIdentifierMap &getTypeIdentifierMap() const {
674 return TypeIdentifierMap;
677 /// Find the DwarfCompileUnit for the given CU Die.
678 DwarfCompileUnit *lookupUnit(const DIE *CU) const {
679 return CUDieMap.lookup(CU);
681 /// isSubprogramContext - Return true if Context is either a subprogram
682 /// or another context nested inside a subprogram.
683 bool isSubprogramContext(const MDNode *Context);
685 void addSubprogramNames(DISubprogram SP, DIE &Die);
687 AddressPool &getAddressPool() { return AddrPool; }
689 void addAccelName(StringRef Name, const DIE &Die);
691 void addAccelObjC(StringRef Name, const DIE &Die);
693 void addAccelNamespace(StringRef Name, const DIE &Die);
695 void addAccelType(StringRef Name, const DIE &Die, char Flags);
697 } // End of namespace llvm