1 //===-- llvm/CodeGen/DwarfUnit.h - Dwarf Compile Unit ---*- 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 compile unit.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DWARFUNIT_H
15 #define LLVM_LIB_CODEGEN_ASMPRINTER_DWARFUNIT_H
18 #include "DwarfDebug.h"
19 #include "llvm/ADT/DenseMap.h"
20 #include "llvm/ADT/Optional.h"
21 #include "llvm/ADT/StringMap.h"
22 #include "llvm/CodeGen/AsmPrinter.h"
23 #include "llvm/IR/DIBuilder.h"
24 #include "llvm/IR/DebugInfo.h"
25 #include "llvm/MC/MCExpr.h"
26 #include "llvm/MC/MCSection.h"
27 #include "llvm/MC/MCDwarf.h"
31 class MachineLocation;
36 class DwarfCompileUnit;
38 // Data structure to hold a range for range lists.
41 RangeSpan(MCSymbol *S, MCSymbol *E) : Start(S), End(E) {}
42 const MCSymbol *getStart() const { return Start; }
43 const MCSymbol *getEnd() const { return End; }
44 void setEnd(const MCSymbol *E) { End = E; }
47 const MCSymbol *Start, *End;
52 // Index for locating within the debug_range section this particular span.
55 SmallVector<RangeSpan, 2> Ranges;
58 RangeSpanList(MCSymbol *Sym) : RangeSym(Sym) {}
59 MCSymbol *getSym() const { return RangeSym; }
60 const SmallVectorImpl<RangeSpan> &getRanges() const { return Ranges; }
61 void addRange(RangeSpan Range) { Ranges.push_back(Range); }
64 //===----------------------------------------------------------------------===//
65 /// Unit - This dwarf writer support class manages information associated
66 /// with a source file.
69 /// UniqueID - a numeric ID unique among all CUs in the module
72 /// Node - MDNode for the compile unit.
75 /// Unit debug information entry.
78 /// Offset of the UnitDie from beginning of debug info section.
79 unsigned DebugInfoOffset;
81 /// Asm - Target of Dwarf emission.
84 // Holders for some common dwarf information.
88 /// IndexTyDie - An anonymous type for index type. Owned by UnitDie.
91 /// MDNodeToDieMap - Tracks the mapping of unit level debug information
92 /// variables to debug information entries.
93 DenseMap<const MDNode *, DIE *> MDNodeToDieMap;
95 /// MDNodeToDIEEntryMap - Tracks the mapping of unit level debug information
96 /// descriptors to debug information entries using a DIEEntry proxy.
97 DenseMap<const MDNode *, DIEEntry *> MDNodeToDIEEntryMap;
99 /// GlobalNames - A map of globally visible named entities for this unit.
100 StringMap<const DIE *> GlobalNames;
102 /// GlobalTypes - A map of globally visible types for this unit.
103 StringMap<const DIE *> GlobalTypes;
105 /// DIEBlocks - A list of all the DIEBlocks in use.
106 std::vector<DIEBlock *> DIEBlocks;
108 /// DIELocs - A list of all the DIELocs in use.
109 std::vector<DIELoc *> DIELocs;
111 /// ContainingTypeMap - This map is used to keep track of subprogram DIEs that
112 /// need DW_AT_containing_type attribute. This attribute points to a DIE that
113 /// corresponds to the MDNode mapped with the subprogram DIE.
114 DenseMap<DIE *, const MDNode *> ContainingTypeMap;
116 // List of ranges for a given compile unit.
117 SmallVector<RangeSpan, 1> CURanges;
119 // List of range lists for a given compile unit, separate from the ranges for
121 SmallVector<RangeSpanList, 1> CURangeLists;
123 // DIEValueAllocator - All DIEValues are allocated through this allocator.
124 BumpPtrAllocator DIEValueAllocator;
126 // DIEIntegerOne - A preallocated DIEValue because 1 is used frequently.
127 DIEInteger *DIEIntegerOne;
129 /// The section this unit will be emitted in.
130 const MCSection *Section;
132 /// A label at the start of the non-dwo section related to this unit.
133 MCSymbol *SectionSym;
135 /// The start of the unit within its section.
136 MCSymbol *LabelBegin;
138 /// The end of the unit within its section.
141 DwarfUnit(unsigned UID, dwarf::Tag, DICompileUnit CU, AsmPrinter *A,
142 DwarfDebug *DW, DwarfFile *DWU);
145 virtual ~DwarfUnit();
147 /// Pass in the SectionSym even though we could recreate it in every compile
148 /// unit (type units will have actually distinct symbols once they're in
149 /// comdat sections).
150 void initSection(const MCSection *Section, MCSymbol *SectionSym) {
151 assert(!this->Section);
152 this->Section = Section;
153 this->SectionSym = SectionSym;
155 Asm->GetTempSymbol(Section->getLabelBeginName(), getUniqueID());
157 Asm->GetTempSymbol(Section->getLabelEndName(), getUniqueID());
160 const MCSection *getSection() const {
165 MCSymbol *getSectionSym() const {
170 MCSymbol *getLabelBegin() const {
175 MCSymbol *getLabelEnd() const {
181 unsigned getUniqueID() const { return UniqueID; }
182 uint16_t getLanguage() const { return CUNode.getLanguage(); }
183 DICompileUnit getCUNode() const { return CUNode; }
184 DIE &getUnitDie() { return UnitDie; }
185 const StringMap<const DIE *> &getGlobalNames() const { return GlobalNames; }
186 const StringMap<const DIE *> &getGlobalTypes() const { return GlobalTypes; }
188 unsigned getDebugInfoOffset() const { return DebugInfoOffset; }
189 void setDebugInfoOffset(unsigned DbgInfoOff) { DebugInfoOffset = DbgInfoOff; }
191 /// hasContent - Return true if this compile unit has something to write out.
192 bool hasContent() const { return !UnitDie.getChildren().empty(); }
194 /// getRanges - Get the list of ranges for this unit.
195 const SmallVectorImpl<RangeSpan> &getRanges() const { return CURanges; }
196 SmallVectorImpl<RangeSpan> &getRanges() { return CURanges; }
198 /// addRangeList - Add an address range list to the list of range lists.
199 void addRangeList(RangeSpanList Ranges) {
200 CURangeLists.push_back(std::move(Ranges));
203 /// getRangeLists - Get the vector of range lists.
204 const SmallVectorImpl<RangeSpanList> &getRangeLists() const {
207 SmallVectorImpl<RangeSpanList> &getRangeLists() { return CURangeLists; }
209 /// getParentContextString - Get a string containing the language specific
210 /// context for a global name.
211 std::string getParentContextString(DIScope Context) const;
213 /// addGlobalName - Add a new global entity to the compile unit.
215 void addGlobalName(StringRef Name, DIE &Die, DIScope Context);
217 /// addAccelNamespace - Add a new name to the namespace accelerator table.
218 void addAccelNamespace(StringRef Name, const DIE &Die);
220 /// getDIE - Returns the debug information entry map slot for the
221 /// specified debug variable. We delegate the request to DwarfDebug
222 /// when the MDNode can be part of the type system, since DIEs for
223 /// the type system can be shared across CUs and the mappings are
224 /// kept in DwarfDebug.
225 DIE *getDIE(DIDescriptor D) const;
227 /// getDIELoc - Returns a fresh newly allocated DIELoc.
228 DIELoc *getDIELoc() { return new (DIEValueAllocator) DIELoc(); }
230 /// insertDIE - Insert DIE into the map. We delegate the request to DwarfDebug
231 /// when the MDNode can be part of the type system, since DIEs for
232 /// the type system can be shared across CUs and the mappings are
233 /// kept in DwarfDebug.
234 void insertDIE(DIDescriptor Desc, DIE *D);
236 /// addFlag - Add a flag that is true to the DIE.
237 void addFlag(DIE &Die, dwarf::Attribute Attribute);
239 /// addUInt - Add an unsigned integer attribute data and value.
240 void addUInt(DIE &Die, dwarf::Attribute Attribute, Optional<dwarf::Form> Form,
243 void addUInt(DIE &Block, dwarf::Form Form, uint64_t Integer);
245 /// addSInt - Add an signed integer attribute data and value.
246 void addSInt(DIE &Die, dwarf::Attribute Attribute, Optional<dwarf::Form> Form,
249 void addSInt(DIELoc &Die, Optional<dwarf::Form> Form, int64_t Integer);
251 /// addString - Add a string attribute data and value.
252 void addString(DIE &Die, dwarf::Attribute Attribute, StringRef Str);
254 /// addLocalString - Add a string attribute data and value.
255 void addLocalString(DIE &Die, dwarf::Attribute Attribute,
258 /// addExpr - Add a Dwarf expression attribute data and value.
259 void addExpr(DIELoc &Die, dwarf::Form Form, const MCExpr *Expr);
261 /// addLabel - Add a Dwarf label attribute data and value.
262 void addLabel(DIE &Die, dwarf::Attribute Attribute, dwarf::Form Form,
263 const MCSymbol *Label);
265 void addLabel(DIELoc &Die, dwarf::Form Form, const MCSymbol *Label);
267 /// addLocationList - Add a Dwarf loclistptr attribute data and value.
268 void addLocationList(DIE &Die, dwarf::Attribute Attribute, unsigned Index);
270 /// addSectionOffset - Add an offset into a section attribute data and value.
272 void addSectionOffset(DIE &Die, dwarf::Attribute Attribute, uint64_t Integer);
274 /// addOpAddress - Add a dwarf op address data and value using the
275 /// form given and an op of either DW_FORM_addr or DW_FORM_GNU_addr_index.
276 void addOpAddress(DIELoc &Die, const MCSymbol *Label);
278 /// addLabelDelta - Add a label delta attribute data and value.
279 void addLabelDelta(DIE &Die, dwarf::Attribute Attribute, const MCSymbol *Hi,
282 /// addDIEEntry - Add a DIE attribute data and value.
283 void addDIEEntry(DIE &Die, dwarf::Attribute Attribute, DIE &Entry);
285 /// addDIEEntry - Add a DIE attribute data and value.
286 void addDIEEntry(DIE &Die, dwarf::Attribute Attribute, DIEEntry *Entry);
288 void addDIETypeSignature(DIE &Die, const DwarfTypeUnit &Type);
290 /// addBlock - Add block data.
291 void addBlock(DIE &Die, dwarf::Attribute Attribute, DIELoc *Block);
293 /// addBlock - Add block data.
294 void addBlock(DIE &Die, dwarf::Attribute Attribute, DIEBlock *Block);
296 /// addSourceLine - Add location information to specified debug information
298 void addSourceLine(DIE &Die, unsigned Line, StringRef File,
299 StringRef Directory);
300 void addSourceLine(DIE &Die, DIVariable V);
301 void addSourceLine(DIE &Die, DIGlobalVariable G);
302 void addSourceLine(DIE &Die, DISubprogram SP);
303 void addSourceLine(DIE &Die, DIType Ty);
304 void addSourceLine(DIE &Die, DINameSpace NS);
305 void addSourceLine(DIE &Die, DIObjCProperty Ty);
307 /// addAddress - Add an address attribute to a die based on the location
309 void addAddress(DIE &Die, dwarf::Attribute Attribute,
310 const MachineLocation &Location, bool Indirect = false);
312 /// addConstantValue - Add constant value entry in variable DIE.
313 void addConstantValue(DIE &Die, const MachineOperand &MO, DIType Ty);
314 void addConstantValue(DIE &Die, const ConstantInt *CI, DIType Ty);
315 void addConstantValue(DIE &Die, const APInt &Val, DIType Ty);
316 void addConstantValue(DIE &Die, const APInt &Val, bool Unsigned);
317 void addConstantValue(DIE &Die, bool Unsigned, uint64_t Val);
319 /// addConstantFPValue - Add constant value entry in variable DIE.
320 void addConstantFPValue(DIE &Die, const MachineOperand &MO);
321 void addConstantFPValue(DIE &Die, const ConstantFP *CFP);
323 /// addTemplateParams - Add template parameters in buffer.
324 void addTemplateParams(DIE &Buffer, DIArray TParams);
326 /// addRegisterOp - Add register operand.
327 void addRegisterOpPiece(DIELoc &TheDie, unsigned Reg,
328 unsigned SizeInBits = 0, unsigned OffsetInBits = 0);
330 /// addRegisterOffset - Add register offset.
331 void addRegisterOffset(DIELoc &TheDie, unsigned Reg, int64_t Offset);
333 /// addComplexAddress - Start with the address based on the location provided,
334 /// and generate the DWARF information necessary to find the actual variable
335 /// (navigating the extra location information encoded in the type) based on
336 /// the starting location. Add the DWARF information to the die.
337 void addComplexAddress(const DbgVariable &DV, DIE &Die,
338 dwarf::Attribute Attribute,
339 const MachineLocation &Location);
341 // FIXME: Should be reformulated in terms of addComplexAddress.
342 /// addBlockByrefAddress - Start with the address based on the location
343 /// provided, and generate the DWARF information necessary to find the
344 /// actual Block variable (navigating the Block struct) based on the
345 /// starting location. Add the DWARF information to the die. Obsolete,
346 /// please use addComplexAddress instead.
347 void addBlockByrefAddress(const DbgVariable &DV, DIE &Die,
348 dwarf::Attribute Attribute,
349 const MachineLocation &Location);
351 /// addVariableAddress - Add DW_AT_location attribute for a
352 /// DbgVariable based on provided MachineLocation.
353 void addVariableAddress(const DbgVariable &DV, DIE &Die,
354 MachineLocation Location);
356 /// addType - Add a new type attribute to the specified entity. This takes
357 /// and attribute parameter because DW_AT_friend attributes are also
359 void addType(DIE &Entity, DIType Ty,
360 dwarf::Attribute Attribute = dwarf::DW_AT_type);
362 /// getOrCreateNameSpace - Create a DIE for DINameSpace.
363 DIE *getOrCreateNameSpace(DINameSpace NS);
365 /// getOrCreateSubprogramDIE - Create new DIE using SP.
366 DIE *getOrCreateSubprogramDIE(DISubprogram SP);
368 void applySubprogramAttributes(DISubprogram SP, DIE &SPDie);
369 void applySubprogramAttributesToDefinition(DISubprogram SP, DIE &SPDie);
370 void applyVariableAttributes(const DbgVariable &Var, DIE &VariableDie);
372 /// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
374 DIE *getOrCreateTypeDIE(const MDNode *N);
376 /// getOrCreateContextDIE - Get context owner's DIE.
377 DIE *createTypeDIE(DICompositeType Ty);
379 /// getOrCreateContextDIE - Get context owner's DIE.
380 DIE *getOrCreateContextDIE(DIScope Context);
382 /// constructContainingTypeDIEs - Construct DIEs for types that contain
384 void constructContainingTypeDIEs();
386 /// constructSubprogramArguments - Construct function argument DIEs.
387 void constructSubprogramArguments(DIE &Buffer, DITypeArray Args);
389 /// Create a DIE with the given Tag, add the DIE to its parent, and
390 /// call insertDIE if MD is not null.
391 DIE &createAndAddDIE(unsigned Tag, DIE &Parent,
392 DIDescriptor N = DIDescriptor());
394 /// Compute the size of a header for this unit, not including the initial
396 virtual unsigned getHeaderSize() const {
397 return sizeof(int16_t) + // DWARF version number
398 sizeof(int32_t) + // Offset Into Abbrev. Section
399 sizeof(int8_t); // Pointer Size (in bytes)
402 /// Emit the header for this unit, not including the initial length field.
403 virtual void emitHeader(const MCSymbol *ASectionSym) const;
405 virtual DwarfCompileUnit &getCU() = 0;
407 /// constructTypeDIE - Construct type DIE from DICompositeType.
408 void constructTypeDIE(DIE &Buffer, DICompositeType CTy);
411 /// getOrCreateStaticMemberDIE - Create new static data member DIE.
412 DIE *getOrCreateStaticMemberDIE(DIDerivedType DT);
414 /// Look up the source ID with the given directory and source file names. If
415 /// none currently exists, create a new ID and insert it in the line table.
416 virtual unsigned getOrCreateSourceID(StringRef File, StringRef Directory) = 0;
418 /// resolve - Look in the DwarfDebug map for the MDNode that
419 /// corresponds to the reference.
420 template <typename T> T resolve(DIRef<T> Ref) const {
421 return DD->resolve(Ref);
425 /// constructTypeDIE - Construct basic type die from DIBasicType.
426 void constructTypeDIE(DIE &Buffer, DIBasicType BTy);
428 /// constructTypeDIE - Construct derived type die from DIDerivedType.
429 void constructTypeDIE(DIE &Buffer, DIDerivedType DTy);
431 /// constructSubrangeDIE - Construct subrange DIE from DISubrange.
432 void constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy);
434 /// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
435 void constructArrayTypeDIE(DIE &Buffer, DICompositeType CTy);
437 /// constructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
438 void constructEnumTypeDIE(DIE &Buffer, DICompositeType CTy);
440 /// constructMemberDIE - Construct member DIE from DIDerivedType.
441 void constructMemberDIE(DIE &Buffer, DIDerivedType DT);
443 /// constructTemplateTypeParameterDIE - Construct new DIE for the given
444 /// DITemplateTypeParameter.
445 void constructTemplateTypeParameterDIE(DIE &Buffer,
446 DITemplateTypeParameter TP);
448 /// constructTemplateValueParameterDIE - Construct new DIE for the given
449 /// DITemplateValueParameter.
450 void constructTemplateValueParameterDIE(DIE &Buffer,
451 DITemplateValueParameter TVP);
453 /// getLowerBoundDefault - Return the default lower bound for an array. If the
454 /// DWARF version doesn't handle the language, return -1.
455 int64_t getDefaultLowerBound() const;
457 /// getDIEEntry - Returns the debug information entry for the specified
459 DIEEntry *getDIEEntry(const MDNode *N) const {
460 return MDNodeToDIEEntryMap.lookup(N);
463 /// insertDIEEntry - Insert debug information entry into the map.
464 void insertDIEEntry(const MDNode *N, DIEEntry *E) {
465 MDNodeToDIEEntryMap.insert(std::make_pair(N, E));
468 // getIndexTyDie - Get an anonymous type for index type.
469 DIE *getIndexTyDie() { return IndexTyDie; }
471 // setIndexTyDie - Set D as anonymous type for index which can be reused
473 void setIndexTyDie(DIE *D) { IndexTyDie = D; }
475 /// createDIEEntry - Creates a new DIEEntry to be a proxy for a debug
476 /// information entry.
477 DIEEntry *createDIEEntry(DIE &Entry);
479 /// If this is a named finished type then include it in the list of types for
480 /// the accelerator tables.
481 void updateAcceleratorTables(DIScope Context, DIType Ty, const DIE &TyDIE);
484 class DwarfTypeUnit : public DwarfUnit {
486 uint64_t TypeSignature;
488 DwarfCompileUnit &CU;
489 MCDwarfDwoLineTable *SplitLineTable;
492 DwarfTypeUnit(unsigned UID, DwarfCompileUnit &CU, AsmPrinter *A,
493 DwarfDebug *DW, DwarfFile *DWU,
494 MCDwarfDwoLineTable *SplitLineTable = nullptr);
496 void setTypeSignature(uint64_t Signature) { TypeSignature = Signature; }
497 uint64_t getTypeSignature() const { return TypeSignature; }
498 void setType(const DIE *Ty) { this->Ty = Ty; }
500 /// Emit the header for this unit, not including the initial length field.
501 void emitHeader(const MCSymbol *ASectionSym) const override;
502 unsigned getHeaderSize() const override {
503 return DwarfUnit::getHeaderSize() + sizeof(uint64_t) + // Type Signature
504 sizeof(uint32_t); // Type DIE Offset
506 void initSection(const MCSection *Section);
507 // Bring in the base function (taking two args, including the section symbol)
508 // for use when building DWO type units (they don't go in unique comdat
510 using DwarfUnit::initSection;
511 DwarfCompileUnit &getCU() override { return CU; }
514 unsigned getOrCreateSourceID(StringRef File, StringRef Directory) override;
516 } // end llvm namespace