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 /// DIEBlocks - A list of all the DIEBlocks in use.
100 std::vector<DIEBlock *> DIEBlocks;
102 /// DIELocs - A list of all the DIELocs in use.
103 std::vector<DIELoc *> DIELocs;
105 /// ContainingTypeMap - This map is used to keep track of subprogram DIEs that
106 /// need DW_AT_containing_type attribute. This attribute points to a DIE that
107 /// corresponds to the MDNode mapped with the subprogram DIE.
108 DenseMap<DIE *, const MDNode *> ContainingTypeMap;
110 // List of ranges for a given compile unit.
111 SmallVector<RangeSpan, 1> CURanges;
113 // List of range lists for a given compile unit, separate from the ranges for
115 SmallVector<RangeSpanList, 1> CURangeLists;
117 // DIEValueAllocator - All DIEValues are allocated through this allocator.
118 BumpPtrAllocator DIEValueAllocator;
120 // DIEIntegerOne - A preallocated DIEValue because 1 is used frequently.
121 DIEInteger *DIEIntegerOne;
123 /// The section this unit will be emitted in.
124 const MCSection *Section;
126 DwarfUnit(unsigned UID, dwarf::Tag, DICompileUnit CU, AsmPrinter *A,
127 DwarfDebug *DW, DwarfFile *DWU);
129 void initSection(const MCSection *Section);
131 virtual ~DwarfUnit();
133 const MCSection *getSection() const {
139 unsigned getUniqueID() const { return UniqueID; }
140 uint16_t getLanguage() const { return CUNode.getLanguage(); }
141 DICompileUnit getCUNode() const { return CUNode; }
142 DIE &getUnitDie() { return UnitDie; }
144 unsigned getDebugInfoOffset() const { return DebugInfoOffset; }
145 void setDebugInfoOffset(unsigned DbgInfoOff) { DebugInfoOffset = DbgInfoOff; }
147 /// hasContent - Return true if this compile unit has something to write out.
148 bool hasContent() const { return !UnitDie.getChildren().empty(); }
150 /// getRanges - Get the list of ranges for this unit.
151 const SmallVectorImpl<RangeSpan> &getRanges() const { return CURanges; }
152 SmallVectorImpl<RangeSpan> &getRanges() { return CURanges; }
154 /// addRangeList - Add an address range list to the list of range lists.
155 void addRangeList(RangeSpanList Ranges) {
156 CURangeLists.push_back(std::move(Ranges));
159 /// getRangeLists - Get the vector of range lists.
160 const SmallVectorImpl<RangeSpanList> &getRangeLists() const {
163 SmallVectorImpl<RangeSpanList> &getRangeLists() { return CURangeLists; }
165 /// getParentContextString - Get a string containing the language specific
166 /// context for a global name.
167 std::string getParentContextString(DIScope Context) const;
169 /// Add a new global name to the compile unit.
170 virtual void addGlobalName(StringRef Name, DIE &Die, DIScope Context) {}
172 /// Add a new global type to the compile unit.
173 virtual void addGlobalType(DIType Ty, const DIE &Die, DIScope Context) {}
175 /// addAccelNamespace - Add a new name to the namespace accelerator table.
176 void addAccelNamespace(StringRef Name, const DIE &Die);
178 /// getDIE - Returns the debug information entry map slot for the
179 /// specified debug variable. We delegate the request to DwarfDebug
180 /// when the MDNode can be part of the type system, since DIEs for
181 /// the type system can be shared across CUs and the mappings are
182 /// kept in DwarfDebug.
183 DIE *getDIE(DIDescriptor D) const;
185 /// getDIELoc - Returns a fresh newly allocated DIELoc.
186 DIELoc *getDIELoc() { return new (DIEValueAllocator) DIELoc(); }
188 /// insertDIE - Insert DIE into the map. We delegate the request to DwarfDebug
189 /// when the MDNode can be part of the type system, since DIEs for
190 /// the type system can be shared across CUs and the mappings are
191 /// kept in DwarfDebug.
192 void insertDIE(DIDescriptor Desc, DIE *D);
194 /// addFlag - Add a flag that is true to the DIE.
195 void addFlag(DIE &Die, dwarf::Attribute Attribute);
197 /// addUInt - Add an unsigned integer attribute data and value.
198 void addUInt(DIE &Die, dwarf::Attribute Attribute, Optional<dwarf::Form> Form,
201 void addUInt(DIE &Block, dwarf::Form Form, uint64_t Integer);
203 /// addSInt - Add an signed integer attribute data and value.
204 void addSInt(DIE &Die, dwarf::Attribute Attribute, Optional<dwarf::Form> Form,
207 void addSInt(DIELoc &Die, Optional<dwarf::Form> Form, int64_t Integer);
209 /// addString - Add a string attribute data and value.
210 void addString(DIE &Die, dwarf::Attribute Attribute, StringRef Str);
212 /// addLocalString - Add a string attribute data and value.
213 void addLocalString(DIE &Die, dwarf::Attribute Attribute,
216 /// addExpr - Add a Dwarf expression attribute data and value.
217 void addExpr(DIELoc &Die, dwarf::Form Form, const MCExpr *Expr);
219 /// addLabel - Add a Dwarf label attribute data and value.
220 void addLabel(DIE &Die, dwarf::Attribute Attribute, dwarf::Form Form,
221 const MCSymbol *Label);
223 void addLabel(DIELoc &Die, dwarf::Form Form, const MCSymbol *Label);
225 /// addLocationList - Add a Dwarf loclistptr attribute data and value.
226 void addLocationList(DIE &Die, dwarf::Attribute Attribute, unsigned Index);
228 /// addSectionOffset - Add an offset into a section attribute data and value.
230 void addSectionOffset(DIE &Die, dwarf::Attribute Attribute, uint64_t Integer);
232 /// addOpAddress - Add a dwarf op address data and value using the
233 /// form given and an op of either DW_FORM_addr or DW_FORM_GNU_addr_index.
234 void addOpAddress(DIELoc &Die, const MCSymbol *Label);
236 /// addLabelDelta - Add a label delta attribute data and value.
237 void addLabelDelta(DIE &Die, dwarf::Attribute Attribute, const MCSymbol *Hi,
240 /// addDIEEntry - Add a DIE attribute data and value.
241 void addDIEEntry(DIE &Die, dwarf::Attribute Attribute, DIE &Entry);
243 /// addDIEEntry - Add a DIE attribute data and value.
244 void addDIEEntry(DIE &Die, dwarf::Attribute Attribute, DIEEntry *Entry);
246 void addDIETypeSignature(DIE &Die, const DwarfTypeUnit &Type);
248 /// addBlock - Add block data.
249 void addBlock(DIE &Die, dwarf::Attribute Attribute, DIELoc *Block);
251 /// addBlock - Add block data.
252 void addBlock(DIE &Die, dwarf::Attribute Attribute, DIEBlock *Block);
254 /// addSourceLine - Add location information to specified debug information
256 void addSourceLine(DIE &Die, unsigned Line, StringRef File,
257 StringRef Directory);
258 void addSourceLine(DIE &Die, DIVariable V);
259 void addSourceLine(DIE &Die, DIGlobalVariable G);
260 void addSourceLine(DIE &Die, DISubprogram SP);
261 void addSourceLine(DIE &Die, DIType Ty);
262 void addSourceLine(DIE &Die, DINameSpace NS);
263 void addSourceLine(DIE &Die, DIObjCProperty Ty);
265 /// addAddress - Add an address attribute to a die based on the location
267 void addAddress(DIE &Die, dwarf::Attribute Attribute,
268 const MachineLocation &Location, bool Indirect = false);
270 /// addConstantValue - Add constant value entry in variable DIE.
271 void addConstantValue(DIE &Die, const MachineOperand &MO, DIType Ty);
272 void addConstantValue(DIE &Die, const ConstantInt *CI, DIType Ty);
273 void addConstantValue(DIE &Die, const APInt &Val, DIType Ty);
274 void addConstantValue(DIE &Die, const APInt &Val, bool Unsigned);
275 void addConstantValue(DIE &Die, bool Unsigned, uint64_t Val);
277 /// addConstantFPValue - Add constant value entry in variable DIE.
278 void addConstantFPValue(DIE &Die, const MachineOperand &MO);
279 void addConstantFPValue(DIE &Die, const ConstantFP *CFP);
281 /// addTemplateParams - Add template parameters in buffer.
282 void addTemplateParams(DIE &Buffer, DIArray TParams);
284 /// addRegisterOp - Add register operand.
285 void addRegisterOpPiece(DIELoc &TheDie, unsigned Reg,
286 unsigned SizeInBits = 0, unsigned OffsetInBits = 0);
288 /// addRegisterOffset - Add register offset.
289 void addRegisterOffset(DIELoc &TheDie, unsigned Reg, int64_t Offset);
291 /// addComplexAddress - Start with the address based on the location provided,
292 /// and generate the DWARF information necessary to find the actual variable
293 /// (navigating the extra location information encoded in the type) based on
294 /// the starting location. Add the DWARF information to the die.
295 void addComplexAddress(const DbgVariable &DV, DIE &Die,
296 dwarf::Attribute Attribute,
297 const MachineLocation &Location);
299 // FIXME: Should be reformulated in terms of addComplexAddress.
300 /// addBlockByrefAddress - Start with the address based on the location
301 /// provided, and generate the DWARF information necessary to find the
302 /// actual Block variable (navigating the Block struct) based on the
303 /// starting location. Add the DWARF information to the die. Obsolete,
304 /// please use addComplexAddress instead.
305 void addBlockByrefAddress(const DbgVariable &DV, DIE &Die,
306 dwarf::Attribute Attribute,
307 const MachineLocation &Location);
309 /// addType - Add a new type attribute to the specified entity. This takes
310 /// and attribute parameter because DW_AT_friend attributes are also
312 void addType(DIE &Entity, DIType Ty,
313 dwarf::Attribute Attribute = dwarf::DW_AT_type);
315 /// getOrCreateNameSpace - Create a DIE for DINameSpace.
316 DIE *getOrCreateNameSpace(DINameSpace NS);
318 /// getOrCreateSubprogramDIE - Create new DIE using SP.
319 DIE *getOrCreateSubprogramDIE(DISubprogram SP);
321 void applySubprogramAttributes(DISubprogram SP, DIE &SPDie);
322 void applySubprogramAttributesToDefinition(DISubprogram SP, DIE &SPDie);
323 void applyVariableAttributes(const DbgVariable &Var, DIE &VariableDie);
325 /// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
327 DIE *getOrCreateTypeDIE(const MDNode *N);
329 /// getOrCreateContextDIE - Get context owner's DIE.
330 DIE *createTypeDIE(DICompositeType Ty);
332 /// getOrCreateContextDIE - Get context owner's DIE.
333 DIE *getOrCreateContextDIE(DIScope Context);
335 /// constructContainingTypeDIEs - Construct DIEs for types that contain
337 void constructContainingTypeDIEs();
339 /// constructSubprogramArguments - Construct function argument DIEs.
340 void constructSubprogramArguments(DIE &Buffer, DITypeArray Args);
342 /// Create a DIE with the given Tag, add the DIE to its parent, and
343 /// call insertDIE if MD is not null.
344 DIE &createAndAddDIE(unsigned Tag, DIE &Parent,
345 DIDescriptor N = DIDescriptor());
347 /// Compute the size of a header for this unit, not including the initial
349 virtual unsigned getHeaderSize() const {
350 return sizeof(int16_t) + // DWARF version number
351 sizeof(int32_t) + // Offset Into Abbrev. Section
352 sizeof(int8_t); // Pointer Size (in bytes)
355 /// Emit the header for this unit, not including the initial length field.
356 virtual void emitHeader(const MCSymbol *ASectionSym) const;
358 virtual DwarfCompileUnit &getCU() = 0;
360 /// constructTypeDIE - Construct type DIE from DICompositeType.
361 void constructTypeDIE(DIE &Buffer, DICompositeType CTy);
364 /// getOrCreateStaticMemberDIE - Create new static data member DIE.
365 DIE *getOrCreateStaticMemberDIE(DIDerivedType DT);
367 /// Look up the source ID with the given directory and source file names. If
368 /// none currently exists, create a new ID and insert it in the line table.
369 virtual unsigned getOrCreateSourceID(StringRef File, StringRef Directory) = 0;
371 /// resolve - Look in the DwarfDebug map for the MDNode that
372 /// corresponds to the reference.
373 template <typename T> T resolve(DIRef<T> Ref) const {
374 return DD->resolve(Ref);
378 /// constructTypeDIE - Construct basic type die from DIBasicType.
379 void constructTypeDIE(DIE &Buffer, DIBasicType BTy);
381 /// constructTypeDIE - Construct derived type die from DIDerivedType.
382 void constructTypeDIE(DIE &Buffer, DIDerivedType DTy);
384 /// constructSubrangeDIE - Construct subrange DIE from DISubrange.
385 void constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy);
387 /// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
388 void constructArrayTypeDIE(DIE &Buffer, DICompositeType CTy);
390 /// constructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
391 void constructEnumTypeDIE(DIE &Buffer, DICompositeType CTy);
393 /// constructMemberDIE - Construct member DIE from DIDerivedType.
394 void constructMemberDIE(DIE &Buffer, DIDerivedType DT);
396 /// constructTemplateTypeParameterDIE - Construct new DIE for the given
397 /// DITemplateTypeParameter.
398 void constructTemplateTypeParameterDIE(DIE &Buffer,
399 DITemplateTypeParameter TP);
401 /// constructTemplateValueParameterDIE - Construct new DIE for the given
402 /// DITemplateValueParameter.
403 void constructTemplateValueParameterDIE(DIE &Buffer,
404 DITemplateValueParameter TVP);
406 /// getLowerBoundDefault - Return the default lower bound for an array. If the
407 /// DWARF version doesn't handle the language, return -1.
408 int64_t getDefaultLowerBound() const;
410 /// getDIEEntry - Returns the debug information entry for the specified
412 DIEEntry *getDIEEntry(const MDNode *N) const {
413 return MDNodeToDIEEntryMap.lookup(N);
416 /// insertDIEEntry - Insert debug information entry into the map.
417 void insertDIEEntry(const MDNode *N, DIEEntry *E) {
418 MDNodeToDIEEntryMap.insert(std::make_pair(N, E));
421 // getIndexTyDie - Get an anonymous type for index type.
422 DIE *getIndexTyDie();
424 // setIndexTyDie - Set D as anonymous type for index which can be reused
426 void setIndexTyDie(DIE *D) { IndexTyDie = D; }
428 /// createDIEEntry - Creates a new DIEEntry to be a proxy for a debug
429 /// information entry.
430 DIEEntry *createDIEEntry(DIE &Entry);
432 /// If this is a named finished type then include it in the list of types for
433 /// the accelerator tables.
434 void updateAcceleratorTables(DIScope Context, DIType Ty, const DIE &TyDIE);
437 class DwarfTypeUnit : public DwarfUnit {
439 uint64_t TypeSignature;
441 DwarfCompileUnit &CU;
442 MCDwarfDwoLineTable *SplitLineTable;
445 DwarfTypeUnit(unsigned UID, DwarfCompileUnit &CU, AsmPrinter *A,
446 DwarfDebug *DW, DwarfFile *DWU,
447 MCDwarfDwoLineTable *SplitLineTable = nullptr);
449 void setTypeSignature(uint64_t Signature) { TypeSignature = Signature; }
450 uint64_t getTypeSignature() const { return TypeSignature; }
451 void setType(const DIE *Ty) { this->Ty = Ty; }
453 /// Emit the header for this unit, not including the initial length field.
454 void emitHeader(const MCSymbol *ASectionSym) const override;
455 unsigned getHeaderSize() const override {
456 return DwarfUnit::getHeaderSize() + sizeof(uint64_t) + // Type Signature
457 sizeof(uint32_t); // Type DIE Offset
459 using DwarfUnit::initSection;
460 DwarfCompileUnit &getCU() override { return CU; }
463 unsigned getOrCreateSourceID(StringRef File, StringRef Directory) override;
465 } // end llvm namespace