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 CODEGEN_ASMPRINTER_DWARFDEBUG_H__
15 #define CODEGEN_ASMPRINTER_DWARFDEBUG_H__
17 #include "AsmPrinterHandler.h"
19 #include "llvm/ADT/DenseMap.h"
20 #include "llvm/ADT/MapVector.h"
21 #include "llvm/ADT/SmallPtrSet.h"
22 #include "llvm/ADT/StringMap.h"
23 #include "llvm/ADT/FoldingSet.h"
24 #include "llvm/CodeGen/LexicalScopes.h"
25 #include "llvm/IR/DebugInfo.h"
26 #include "llvm/IR/DebugLoc.h"
27 #include "llvm/MC/MachineLocation.h"
28 #include "llvm/MC/MCDwarf.h"
29 #include "llvm/Support/Allocator.h"
37 class DwarfCompileUnit;
41 class MachineModuleInfo;
43 //===----------------------------------------------------------------------===//
44 /// \brief This class is used to record source line correspondence.
46 unsigned Line; // Source line number.
47 unsigned Column; // Source column.
48 unsigned SourceID; // Source ID number.
49 MCSymbol *Label; // Label in code ID number.
51 SrcLineInfo(unsigned L, unsigned C, unsigned S, MCSymbol *label)
52 : Line(L), Column(C), SourceID(S), Label(label) {}
55 unsigned getLine() const { return Line; }
56 unsigned getColumn() const { return Column; }
57 unsigned getSourceID() const { return SourceID; }
58 MCSymbol *getLabel() const { return Label; }
61 /// \brief This struct describes location entries emitted in the .debug_loc
64 // Begin and end symbols for the address range that this location is valid.
65 const MCSymbol *Begin;
68 // Type of entry that this represents.
69 enum EntryType { E_Location, E_Integer, E_ConstantFP, E_ConstantInt };
70 enum EntryType EntryKind;
74 const ConstantFP *CFP;
75 const ConstantInt *CIP;
78 // The location in the machine frame.
81 // The variable to which this location entry corresponds.
82 const MDNode *Variable;
84 // Whether this location has been merged.
88 DebugLocEntry() : Begin(0), End(0), Variable(0), Merged(false) {
91 DebugLocEntry(const MCSymbol *B, const MCSymbol *E, MachineLocation &L,
93 : Begin(B), End(E), Loc(L), Variable(V), Merged(false) {
95 EntryKind = E_Location;
97 DebugLocEntry(const MCSymbol *B, const MCSymbol *E, int64_t i)
98 : Begin(B), End(E), Variable(0), Merged(false) {
100 EntryKind = E_Integer;
102 DebugLocEntry(const MCSymbol *B, const MCSymbol *E, const ConstantFP *FPtr)
103 : Begin(B), End(E), Variable(0), Merged(false) {
104 Constants.CFP = FPtr;
105 EntryKind = E_ConstantFP;
107 DebugLocEntry(const MCSymbol *B, const MCSymbol *E, const ConstantInt *IPtr)
108 : Begin(B), End(E), Variable(0), Merged(false) {
109 Constants.CIP = IPtr;
110 EntryKind = E_ConstantInt;
113 /// \brief Empty entries are also used as a trigger to emit temp label. Such
114 /// labels are referenced is used to find debug_loc offset for a given DIE.
115 bool isEmpty() const { return Begin == 0 && End == 0; }
116 bool isMerged() const { return Merged; }
117 void Merge(DebugLocEntry *Next) {
118 if (!(Begin && Loc == Next->Loc && End == Next->Begin))
123 bool isLocation() const { return EntryKind == E_Location; }
124 bool isInt() const { return EntryKind == E_Integer; }
125 bool isConstantFP() const { return EntryKind == E_ConstantFP; }
126 bool isConstantInt() const { return EntryKind == E_ConstantInt; }
127 int64_t getInt() const { return Constants.Int; }
128 const ConstantFP *getConstantFP() const { return Constants.CFP; }
129 const ConstantInt *getConstantInt() const { return Constants.CIP; }
130 const MDNode *getVariable() const { return Variable; }
131 const MCSymbol *getBeginSym() const { return Begin; }
132 const MCSymbol *getEndSym() const { return End; }
133 MachineLocation getLoc() const { return Loc; }
136 //===----------------------------------------------------------------------===//
137 /// \brief This class is used to track local variable information.
139 DIVariable Var; // Variable Descriptor.
140 DIE *TheDIE; // Variable DIE.
141 unsigned DotDebugLocOffset; // Offset in DotDebugLocEntries.
142 DbgVariable *AbsVar; // Corresponding Abstract variable, if any.
143 const MachineInstr *MInsn; // DBG_VALUE instruction of the variable.
148 // AbsVar may be NULL.
149 DbgVariable(DIVariable V, DbgVariable *AV, DwarfDebug *DD)
150 : Var(V), TheDIE(0), DotDebugLocOffset(~0U), AbsVar(AV), MInsn(0),
151 FrameIndex(~0), DD(DD) {}
154 DIVariable getVariable() const { return Var; }
155 void setDIE(DIE *D) { TheDIE = D; }
156 DIE *getDIE() const { return TheDIE; }
157 void setDotDebugLocOffset(unsigned O) { DotDebugLocOffset = O; }
158 unsigned getDotDebugLocOffset() const { return DotDebugLocOffset; }
159 StringRef getName() const { return Var.getName(); }
160 DbgVariable *getAbstractVariable() const { return AbsVar; }
161 const MachineInstr *getMInsn() const { return MInsn; }
162 void setMInsn(const MachineInstr *M) { MInsn = M; }
163 int getFrameIndex() const { return FrameIndex; }
164 void setFrameIndex(int FI) { FrameIndex = FI; }
165 // Translate tag to proper Dwarf tag.
166 uint16_t getTag() const {
167 if (Var.getTag() == dwarf::DW_TAG_arg_variable)
168 return dwarf::DW_TAG_formal_parameter;
170 return dwarf::DW_TAG_variable;
172 /// \brief Return true if DbgVariable is artificial.
173 bool isArtificial() const {
174 if (Var.isArtificial())
176 if (getType().isArtificial())
181 bool isObjectPointer() const {
182 if (Var.isObjectPointer())
184 if (getType().isObjectPointer())
189 bool variableHasComplexAddress() const {
190 assert(Var.isVariable() && "Invalid complex DbgVariable!");
191 return Var.hasComplexAddress();
193 bool isBlockByrefVariable() const;
194 unsigned getNumAddrElements() const {
195 assert(Var.isVariable() && "Invalid complex DbgVariable!");
196 return Var.getNumAddrElements();
198 uint64_t getAddrElement(unsigned i) const { return Var.getAddrElement(i); }
199 DIType getType() const;
202 /// resolve - Look in the DwarfDebug map for the MDNode that
203 /// corresponds to the reference.
204 template <typename T> T resolve(DIRef<T> Ref) const;
207 /// \brief Collects and handles information specific to a particular
208 /// collection of units. This collection represents all of the units
209 /// that will be ultimately output into a single object file.
211 // Target of Dwarf emission, used for sizing of abbreviations.
214 // Used to uniquely define abbreviations.
215 FoldingSet<DIEAbbrev> AbbreviationsSet;
217 // A list of all the unique abbreviations in use.
218 std::vector<DIEAbbrev *> Abbreviations;
220 // A pointer to all units in the section.
221 SmallVector<DwarfUnit *, 1> CUs;
223 // Collection of strings for this unit and assorted symbols.
224 // A String->Symbol mapping of strings used by indirect
226 typedef StringMap<std::pair<MCSymbol *, unsigned>, BumpPtrAllocator &>
229 unsigned NextStringPoolNumber;
230 std::string StringPref;
232 struct AddressPoolEntry {
235 AddressPoolEntry(unsigned Number, bool TLS) : Number(Number), TLS(TLS) {}
237 // Collection of addresses for this unit and assorted labels.
238 // A Symbol->unsigned mapping of addresses used by indirect
240 typedef DenseMap<const MCSymbol *, AddressPoolEntry> AddrPool;
241 AddrPool AddressPool;
242 unsigned NextAddrPoolNumber;
245 DwarfFile(AsmPrinter *AP, const char *Pref, BumpPtrAllocator &DA)
246 : Asm(AP), StringPool(DA), NextStringPoolNumber(0), StringPref(Pref),
247 AddressPool(), NextAddrPoolNumber(0) {}
251 const SmallVectorImpl<DwarfUnit *> &getUnits() { return CUs; }
253 /// \brief Compute the size and offset of a DIE given an incoming Offset.
254 unsigned computeSizeAndOffset(DIE *Die, unsigned Offset);
256 /// \brief Compute the size and offset of all the DIEs.
257 void computeSizeAndOffsets();
259 /// \brief Define a unique number for the abbreviation.
260 void assignAbbrevNumber(DIEAbbrev &Abbrev);
262 /// \brief Add a unit to the list of CUs.
263 void addUnit(DwarfUnit *CU) { CUs.push_back(CU); }
265 /// \brief Emit all of the units to the section listed with the given
266 /// abbreviation section.
267 void emitUnits(DwarfDebug *DD, const MCSection *ASection,
268 const MCSymbol *ASectionSym);
270 /// \brief Emit a set of abbreviations to the specific section.
271 void emitAbbrevs(const MCSection *);
273 /// \brief Emit all of the strings to the section given.
274 void emitStrings(const MCSection *StrSection, const MCSection *OffsetSection,
275 const MCSymbol *StrSecSym);
277 /// \brief Emit all of the addresses to the section given.
278 void emitAddresses(const MCSection *AddrSection);
280 /// \brief Returns the entry into the start of the pool.
281 MCSymbol *getStringPoolSym();
283 /// \brief Returns an entry into the string pool with the given
285 MCSymbol *getStringPoolEntry(StringRef Str);
287 /// \brief Returns the index into the string pool with the given
289 unsigned getStringPoolIndex(StringRef Str);
291 /// \brief Returns the string pool.
292 StrPool *getStringPool() { return &StringPool; }
294 /// \brief Returns the index into the address pool with the given
296 unsigned getAddrPoolIndex(const MCSymbol *Sym, bool TLS = false);
298 /// \brief Returns the address pool.
299 AddrPool *getAddrPool() { return &AddressPool; }
302 /// \brief Helper used to pair up a symbol and its DWARF compile unit.
304 SymbolCU(DwarfCompileUnit *CU, const MCSymbol *Sym) : Sym(Sym), CU(CU) {}
306 DwarfCompileUnit *CU;
309 /// \brief Collects and handles dwarf debug information.
310 class DwarfDebug : public AsmPrinterHandler {
311 // Target of Dwarf emission.
314 // Collected machine module information.
315 MachineModuleInfo *MMI;
317 // All DIEValues are allocated through this allocator.
318 BumpPtrAllocator DIEValueAllocator;
320 // Handle to the compile unit used for the inline extension handling,
321 // this is just so that the DIEValue allocator has a place to store
322 // the particular elements.
323 // FIXME: Store these off of DwarfDebug instead?
324 DwarfCompileUnit *FirstCU;
326 // Maps MDNode with its corresponding DwarfCompileUnit.
327 MapVector<const MDNode *, DwarfCompileUnit *> CUMap;
329 // Maps subprogram MDNode with its corresponding DwarfCompileUnit.
330 DenseMap<const MDNode *, DwarfCompileUnit *> SPMap;
332 // Maps a CU DIE with its corresponding DwarfCompileUnit.
333 DenseMap<const DIE *, DwarfCompileUnit *> CUDieMap;
335 /// Maps MDNodes for type sysstem with the corresponding DIEs. These DIEs can
336 /// be shared across CUs, that is why we keep the map here instead
337 /// of in DwarfCompileUnit.
338 DenseMap<const MDNode *, DIE *> MDTypeNodeToDieMap;
340 // List of all labels used in aranges generation.
341 std::vector<SymbolCU> ArangeLabels;
343 // Size of each symbol emitted (for those symbols that have a specific size).
344 DenseMap<const MCSymbol *, uint64_t> SymSize;
346 // Provides a unique id per text section.
347 typedef DenseMap<const MCSection *, SmallVector<SymbolCU, 8> > SectionMapType;
348 SectionMapType SectionMap;
350 // List of arguments for current function.
351 SmallVector<DbgVariable *, 8> CurrentFnArguments;
353 LexicalScopes LScopes;
355 // Collection of abstract subprogram DIEs.
356 DenseMap<const MDNode *, DIE *> AbstractSPDies;
358 // Collection of dbg variables of a scope.
359 typedef DenseMap<LexicalScope *, SmallVector<DbgVariable *, 8> >
361 ScopeVariablesMap ScopeVariables;
363 // Collection of abstract variables.
364 DenseMap<const MDNode *, DbgVariable *> AbstractVariables;
366 // Collection of DebugLocEntry.
367 SmallVector<DebugLocEntry, 4> DotDebugLocEntries;
369 // Collection of subprogram DIEs that are marked (at the end of the module)
371 SmallPtrSet<DIE *, 4> InlinedSubprogramDIEs;
373 // This is a collection of subprogram MDNodes that are processed to
375 SmallPtrSet<const MDNode *, 16> ProcessedSPNodes;
377 // Maps instruction with label emitted before instruction.
378 DenseMap<const MachineInstr *, MCSymbol *> LabelsBeforeInsn;
380 // Maps instruction with label emitted after instruction.
381 DenseMap<const MachineInstr *, MCSymbol *> LabelsAfterInsn;
383 // Every user variable mentioned by a DBG_VALUE instruction in order of
385 SmallVector<const MDNode *, 8> UserVariables;
387 // For each user variable, keep a list of DBG_VALUE instructions in order.
388 // The list can also contain normal instructions that clobber the previous
390 typedef DenseMap<const MDNode *, SmallVector<const MachineInstr *, 4> >
392 DbgValueHistoryMap DbgValues;
394 // Previous instruction's location information. This is used to determine
395 // label location to indicate scope boundries in dwarf debug info.
396 DebugLoc PrevInstLoc;
399 // This location indicates end of function prologue and beginning of function
401 DebugLoc PrologEndLoc;
403 // If nonnull, stores the current machine function we're processing.
404 const MachineFunction *CurFn;
406 // If nonnull, stores the current machine instruction we're processing.
407 const MachineInstr *CurMI;
409 // If nonnull, stores the section that the previous function was allocated to
411 const MCSection *PrevSection;
413 // If nonnull, stores the CU in which the previous subprogram was contained.
414 const DwarfCompileUnit *PrevCU;
416 // Section Symbols: these are assembler temporary labels that are emitted at
417 // the beginning of each supported dwarf section. These are used to form
418 // section offsets and are created by EmitSectionLabels.
419 MCSymbol *DwarfInfoSectionSym, *DwarfAbbrevSectionSym;
420 MCSymbol *DwarfStrSectionSym, *TextSectionSym, *DwarfDebugRangeSectionSym;
421 MCSymbol *DwarfDebugLocSectionSym, *DwarfLineSectionSym, *DwarfAddrSectionSym;
422 MCSymbol *FunctionBeginSym, *FunctionEndSym;
423 MCSymbol *DwarfInfoDWOSectionSym, *DwarfAbbrevDWOSectionSym;
424 MCSymbol *DwarfStrDWOSectionSym;
425 MCSymbol *DwarfGnuPubNamesSectionSym, *DwarfGnuPubTypesSectionSym;
427 // As an optimization, there is no need to emit an entry in the directory
428 // table for the same directory as DW_AT_comp_dir.
429 StringRef CompilationDir;
431 // Counter for assigning globally unique IDs for ranges.
432 unsigned GlobalRangeCount;
434 // Holder for the file specific debug information.
435 DwarfFile InfoHolder;
437 // Holders for the various debug information flags that we might need to
438 // have exposed. See accessor functions below for description.
440 // Holder for imported entities.
441 typedef SmallVector<std::pair<const MDNode *, const MDNode *>, 32>
443 ImportedEntityMap ScopesWithImportedEntities;
445 // Map from MDNodes for user-defined types to the type units that describe
447 DenseMap<const MDNode *, const DwarfTypeUnit *> DwarfTypeUnits;
449 // Whether to emit the pubnames/pubtypes sections.
450 bool HasDwarfPubSections;
452 // Whether or not to use AT_ranges for compilation units.
455 // Whether we emitted a function into a section other than the default
457 bool UsedNonDefaultText;
459 // Version of dwarf we're emitting.
460 unsigned DwarfVersion;
462 // Maps from a type identifier to the actual MDNode.
463 DITypeIdentifierMap TypeIdentifierMap;
465 // DWARF5 Experimental Options
466 bool HasDwarfAccelTables;
469 // Separated Dwarf Variables
470 // In general these will all be for bits that are left in the
471 // original object file, rather than things that are meant
472 // to be in the .dwo sections.
474 // Holder for the skeleton information.
475 DwarfFile SkeletonHolder;
477 /// Store file names for type units under fission in a line table header that
478 /// will be emitted into debug_line.dwo.
479 // FIXME: replace this with a map from comp_dir to table so that we can emit
480 // multiple tables during LTO each of which uses directory 0, referencing the
481 // comp_dir of all the type units that use it.
482 MCDwarfDwoLineTable SplitTypeUnitFileTable;
484 // True iff there are multiple CUs in this module.
487 MCDwarfDwoLineTable *getDwoLineTable(const DwarfCompileUnit &);
489 void addScopeVariable(LexicalScope *LS, DbgVariable *Var);
491 const SmallVectorImpl<DwarfUnit *> &getUnits() {
492 return InfoHolder.getUnits();
495 /// \brief Find abstract variable associated with Var.
496 DbgVariable *findAbstractVariable(DIVariable &Var, DebugLoc Loc);
498 /// \brief Find DIE for the given subprogram and attach appropriate
499 /// DW_AT_low_pc and DW_AT_high_pc attributes. If there are global
500 /// variables in this scope then create and insert DIEs for these
502 DIE *updateSubprogramScopeDIE(DwarfCompileUnit *SPCU, DISubprogram SP);
504 /// \brief A helper function to check whether the DIE for a given Scope is
505 /// going to be null.
506 bool isLexicalScopeDIENull(LexicalScope *Scope);
508 /// \brief A helper function to construct a RangeSpanList for a given
510 void addScopeRangeList(DwarfCompileUnit *TheCU, DIE *ScopeDIE,
511 const SmallVectorImpl<InsnRange> &Range);
513 /// \brief Construct new DW_TAG_lexical_block for this scope and
514 /// attach DW_AT_low_pc/DW_AT_high_pc labels.
515 DIE *constructLexicalScopeDIE(DwarfCompileUnit *TheCU, LexicalScope *Scope);
517 /// \brief This scope represents inlined body of a function. Construct
518 /// DIE to represent this concrete inlined copy of the function.
519 DIE *constructInlinedScopeDIE(DwarfCompileUnit *TheCU, LexicalScope *Scope);
521 /// \brief Construct a DIE for this scope.
522 DIE *constructScopeDIE(DwarfCompileUnit *TheCU, LexicalScope *Scope);
523 /// A helper function to create children of a Scope DIE.
524 DIE *createScopeChildrenDIE(DwarfCompileUnit *TheCU, LexicalScope *Scope,
525 SmallVectorImpl<DIE *> &Children);
527 /// \brief Emit initial Dwarf sections with a label at the start of each one.
528 void emitSectionLabels();
530 /// \brief Compute the size and offset of a DIE given an incoming Offset.
531 unsigned computeSizeAndOffset(DIE *Die, unsigned Offset);
533 /// \brief Compute the size and offset of all the DIEs.
534 void computeSizeAndOffsets();
536 /// \brief Attach DW_AT_inline attribute with inlined subprogram DIEs.
537 void computeInlinedDIEs();
539 /// \brief Collect info for variables that were optimized out.
540 void collectDeadVariables();
542 /// \brief Finish off debug information after all functions have been
544 void finalizeModuleInfo();
546 /// \brief Emit labels to close any remaining sections that have been left
550 /// \brief Emit the debug info section.
551 void emitDebugInfo();
553 /// \brief Emit the abbreviation section.
554 void emitAbbreviations();
556 /// \brief Emit the last address of the section and the end of
558 void emitEndOfLineMatrix(unsigned SectionEnd);
560 /// \brief Emit visible names into a hashed accelerator table section.
561 void emitAccelNames();
563 /// \brief Emit objective C classes and categories into a hashed
564 /// accelerator table section.
565 void emitAccelObjC();
567 /// \brief Emit namespace dies into a hashed accelerator table.
568 void emitAccelNamespaces();
570 /// \brief Emit type dies into a hashed accelerator table.
571 void emitAccelTypes();
573 /// \brief Emit visible names into a debug pubnames section.
574 /// \param GnuStyle determines whether or not we want to emit
575 /// additional information into the table ala newer gcc for gdb
577 void emitDebugPubNames(bool GnuStyle = false);
579 /// \brief Emit visible types into a debug pubtypes section.
580 /// \param GnuStyle determines whether or not we want to emit
581 /// additional information into the table ala newer gcc for gdb
583 void emitDebugPubTypes(bool GnuStyle = false);
586 emitDebugPubSection(bool GnuStyle, const MCSection *PSec, StringRef Name,
587 const StringMap<const DIE *> &(DwarfUnit::*Accessor)()
590 /// \brief Emit visible names into a debug str section.
593 /// \brief Emit visible names into a debug loc section.
596 /// \brief Emit visible names into a debug aranges section.
597 void emitDebugARanges();
599 /// \brief Emit visible names into a debug ranges section.
600 void emitDebugRanges();
602 /// \brief Emit inline info using custom format.
603 void emitDebugInlineInfo();
605 /// DWARF 5 Experimental Split Dwarf Emitters
607 /// \brief Initialize common features of skeleton units.
608 void initSkeletonUnit(const DwarfUnit *U, DIE *Die, DwarfUnit *NewU);
610 /// \brief Construct the split debug info compile unit for the debug info
612 DwarfCompileUnit *constructSkeletonCU(const DwarfCompileUnit *CU);
614 /// \brief Construct the split debug info compile unit for the debug info
616 DwarfTypeUnit *constructSkeletonTU(DwarfTypeUnit *TU);
618 /// \brief Emit the debug info dwo section.
619 void emitDebugInfoDWO();
621 /// \brief Emit the debug abbrev dwo section.
622 void emitDebugAbbrevDWO();
624 /// \brief Emit the debug line dwo section.
625 void emitDebugLineDWO();
627 /// \brief Emit the debug str dwo section.
628 void emitDebugStrDWO();
630 /// Flags to let the linker know we have emitted new style pubnames. Only
631 /// emit it here if we don't have a skeleton CU for split dwarf.
632 void addGnuPubAttributes(DwarfUnit *U, DIE *D) const;
634 /// \brief Create new DwarfCompileUnit for the given metadata node with tag
635 /// DW_TAG_compile_unit.
636 DwarfCompileUnit *constructDwarfCompileUnit(DICompileUnit DIUnit);
638 /// \brief Construct subprogram DIE.
639 void constructSubprogramDIE(DwarfCompileUnit *TheCU, const MDNode *N);
641 /// \brief Construct imported_module or imported_declaration DIE.
642 void constructImportedEntityDIE(DwarfCompileUnit *TheCU, const MDNode *N);
644 /// \brief Construct import_module DIE.
645 void constructImportedEntityDIE(DwarfCompileUnit *TheCU, const MDNode *N,
648 /// \brief Construct import_module DIE.
649 void constructImportedEntityDIE(DwarfCompileUnit *TheCU,
650 const DIImportedEntity &Module, DIE *Context);
652 /// \brief Register a source line with debug info. Returns the unique
653 /// label that was emitted and which provides correspondence to the
654 /// source line list.
655 void recordSourceLine(unsigned Line, unsigned Col, const MDNode *Scope,
658 /// \brief Indentify instructions that are marking the beginning of or
659 /// ending of a scope.
660 void identifyScopeMarkers();
662 /// \brief If Var is an current function argument that add it in
663 /// CurrentFnArguments list.
664 bool addCurrentFnArgument(DbgVariable *Var, LexicalScope *Scope);
666 /// \brief Populate LexicalScope entries with variables' info.
667 void collectVariableInfo(SmallPtrSet<const MDNode *, 16> &ProcessedVars);
669 /// \brief Collect variable information from the side table maintained
671 void collectVariableInfoFromMMITable(SmallPtrSet<const MDNode *, 16> &P);
673 /// \brief Ensure that a label will be emitted before MI.
674 void requestLabelBeforeInsn(const MachineInstr *MI) {
675 LabelsBeforeInsn.insert(std::make_pair(MI, (MCSymbol *)0));
678 /// \brief Return Label preceding the instruction.
679 MCSymbol *getLabelBeforeInsn(const MachineInstr *MI);
681 /// \brief Ensure that a label will be emitted after MI.
682 void requestLabelAfterInsn(const MachineInstr *MI) {
683 LabelsAfterInsn.insert(std::make_pair(MI, (MCSymbol *)0));
686 /// \brief Return Label immediately following the instruction.
687 MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
689 void attachLowHighPC(DwarfCompileUnit *Unit, DIE *D, MCSymbol *Begin,
693 //===--------------------------------------------------------------------===//
694 // Main entry points.
696 DwarfDebug(AsmPrinter *A, Module *M);
698 void insertDIE(const MDNode *TypeMD, DIE *Die) {
699 MDTypeNodeToDieMap.insert(std::make_pair(TypeMD, Die));
701 DIE *getDIE(const MDNode *TypeMD) {
702 return MDTypeNodeToDieMap.lookup(TypeMD);
705 /// \brief Emit all Dwarf sections that should come prior to the
709 /// \brief Emit all Dwarf sections that should come after the content.
710 void endModule() override;
712 /// \brief Gather pre-function debug information.
713 void beginFunction(const MachineFunction *MF) override;
715 /// \brief Gather and emit post-function debug information.
716 void endFunction(const MachineFunction *MF) override;
718 /// \brief Process beginning of an instruction.
719 void beginInstruction(const MachineInstr *MI) override;
721 /// \brief Process end of an instruction.
722 void endInstruction() override;
724 /// \brief Add a DIE to the set of types that we're going to pull into
726 void addDwarfTypeUnitType(DwarfCompileUnit &CU, StringRef Identifier,
727 DIE *Die, DICompositeType CTy);
729 /// \brief Add a label so that arange data can be generated for it.
730 void addArangeLabel(SymbolCU SCU) { ArangeLabels.push_back(SCU); }
732 /// \brief For symbols that have a size designated (e.g. common symbols),
733 /// this tracks that size.
734 void setSymbolSize(const MCSymbol *Sym, uint64_t Size) override {
738 /// \brief Recursively Emits a debug information entry.
739 void emitDIE(DIE *Die);
741 // Experimental DWARF5 features.
743 /// \brief Returns whether or not to emit tables that dwarf consumers can
744 /// use to accelerate lookup.
745 bool useDwarfAccelTables() const { return HasDwarfAccelTables; }
747 /// \brief Returns whether or not to change the current debug info for the
748 /// split dwarf proposal support.
749 bool useSplitDwarf() const { return HasSplitDwarf; }
751 /// Returns the Dwarf Version.
752 unsigned getDwarfVersion() const { return DwarfVersion; }
754 /// Returns the section symbol for the .debug_loc section.
755 MCSymbol *getDebugLocSym() const { return DwarfDebugLocSectionSym; }
757 /// Returns the previous section that was emitted into.
758 const MCSection *getPrevSection() const { return PrevSection; }
760 /// Returns the previous CU that was being updated
761 const DwarfCompileUnit *getPrevCU() const { return PrevCU; }
763 /// Returns the entries for the .debug_loc section.
764 const SmallVectorImpl<DebugLocEntry> &getDebugLocEntries() const {
765 return DotDebugLocEntries;
768 /// \brief Emit an entry for the debug loc section. This can be used to
769 /// handle an entry that's going to be emitted into the debug loc section.
770 void emitDebugLocEntry(ByteStreamer &Streamer, const DebugLocEntry &Entry);
772 /// Find the MDNode for the given reference.
773 template <typename T> T resolve(DIRef<T> Ref) const {
774 return Ref.resolve(TypeIdentifierMap);
777 /// \brief Return the TypeIdentifierMap.
778 const DITypeIdentifierMap &getTypeIdentifierMap() const {
779 return TypeIdentifierMap;
782 /// Find the DwarfCompileUnit for the given CU Die.
783 DwarfCompileUnit *lookupUnit(const DIE *CU) const {
784 return CUDieMap.lookup(CU);
786 /// isSubprogramContext - Return true if Context is either a subprogram
787 /// or another context nested inside a subprogram.
788 bool isSubprogramContext(const MDNode *Context);
790 } // End of namespace llvm