1 //===--- llvm/Analysis/DebugInfo.h - Debug Information Helpers --*- 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 defines a bunch of datatypes that are useful for creating and
11 // walking debug info in LLVM IR form. They essentially provide wrappers around
12 // the information in the global variables that's needed when constructing the
15 //===----------------------------------------------------------------------===//
17 #ifndef LLVM_ANALYSIS_DEBUGINFO_H
18 #define LLVM_ANALYSIS_DEBUGINFO_H
20 #include "llvm/Metadata.h"
21 #include "llvm/Target/TargetMachine.h"
22 #include "llvm/ADT/StringMap.h"
23 #include "llvm/ADT/DenseMap.h"
24 #include "llvm/ADT/SmallVector.h"
25 #include "llvm/ADT/SmallPtrSet.h"
26 #include "llvm/Support/Dwarf.h"
36 struct DbgStopPointInst;
37 struct DbgDeclareInst;
38 struct DbgFuncStartInst;
39 struct DbgRegionStartInst;
40 struct DbgRegionEndInst;
42 struct DebugLocTracker;
50 /// DIDescriptor constructor. If the specified node is non-null, check
51 /// to make sure that the tag in the descriptor matches 'RequiredTag'. If
52 /// not, the debug info is corrupt and we ignore it.
53 DIDescriptor(MDNode *N, unsigned RequiredTag);
55 const std::string &getStringField(unsigned Elt, std::string &Result) const;
56 unsigned getUnsignedField(unsigned Elt) const {
57 return (unsigned)getUInt64Field(Elt);
59 uint64_t getUInt64Field(unsigned Elt) const;
60 DIDescriptor getDescriptorField(unsigned Elt) const;
62 template <typename DescTy>
63 DescTy getFieldAs(unsigned Elt) const {
64 return DescTy(getDescriptorField(Elt).getNode());
67 GlobalVariable *getGlobalVariableField(unsigned Elt) const;
70 explicit DIDescriptor() : DbgNode(0) {}
71 explicit DIDescriptor(MDNode *N) : DbgNode(N) {}
73 bool isNull() const { return DbgNode == 0; }
75 MDNode *getNode() const { return DbgNode; }
77 unsigned getVersion() const {
78 return getUnsignedField(0) & LLVMDebugVersionMask;
81 unsigned getTag() const {
82 return getUnsignedField(0) & ~LLVMDebugVersionMask;
85 /// ValidDebugInfo - Return true if N represents valid debug info value.
86 static bool ValidDebugInfo(MDNode *N, CodeGenOpt::Level OptLevel);
88 /// dump - print descriptor.
91 bool isDerivedType() const;
92 bool isCompositeType() const;
93 bool isBasicType() const;
94 bool isVariable() const;
95 bool isSubprogram() const;
96 bool isGlobalVariable() const;
98 bool isCompileUnit() const;
101 /// DISubrange - This is used to represent ranges, for array bounds.
102 class DISubrange : public DIDescriptor {
104 explicit DISubrange(MDNode *N = 0)
105 : DIDescriptor(N, dwarf::DW_TAG_subrange_type) {}
107 int64_t getLo() const { return (int64_t)getUInt64Field(1); }
108 int64_t getHi() const { return (int64_t)getUInt64Field(2); }
111 /// DIArray - This descriptor holds an array of descriptors.
112 class DIArray : public DIDescriptor {
114 explicit DIArray(MDNode *N = 0)
117 unsigned getNumElements() const;
118 DIDescriptor getElement(unsigned Idx) const {
119 return getDescriptorField(Idx);
123 /// DIScope - A base class for various scopes.
124 class DIScope : public DIDescriptor {
126 explicit DIScope(MDNode *N = 0) : DIDescriptor (N) {
127 if (DbgNode && !isScope())
132 /// DICompileUnit - A wrapper for a compile unit.
133 class DICompileUnit : public DIScope {
135 explicit DICompileUnit(MDNode *N = 0) {
137 if (DbgNode && !isCompileUnit())
141 unsigned getLanguage() const { return getUnsignedField(2); }
142 const std::string &getFilename(std::string &F) const {
143 return getStringField(3, F);
145 const std::string &getDirectory(std::string &F) const {
146 return getStringField(4, F);
148 const std::string &getProducer(std::string &F) const {
149 return getStringField(5, F);
152 /// isMain - Each input file is encoded as a separate compile unit in LLVM
153 /// debugging information output. However, many target specific tool chains
154 /// prefer to encode only one compile unit in an object file. In this
155 /// situation, the LLVM code generator will include debugging information
156 /// entities in the compile unit that is marked as main compile unit. The
157 /// code generator accepts maximum one main compile unit per module. If a
158 /// module does not contain any main compile unit then the code generator
159 /// will emit multiple compile units in the output object file.
161 bool isMain() const { return getUnsignedField(6); }
162 bool isOptimized() const { return getUnsignedField(7); }
163 const std::string &getFlags(std::string &F) const {
164 return getStringField(8, F);
166 unsigned getRunTimeVersion() const { return getUnsignedField(9); }
168 /// Verify - Verify that a compile unit is well formed.
171 /// dump - print compile unit.
175 /// DIEnumerator - A wrapper for an enumerator (e.g. X and Y in 'enum {X,Y}').
176 /// FIXME: it seems strange that this doesn't have either a reference to the
177 /// type/precision or a file/line pair for location info.
178 class DIEnumerator : public DIDescriptor {
180 explicit DIEnumerator(MDNode *N = 0)
181 : DIDescriptor(N, dwarf::DW_TAG_enumerator) {}
183 const std::string &getName(std::string &F) const {
184 return getStringField(1, F);
186 uint64_t getEnumValue() const { return getUInt64Field(2); }
189 /// DIType - This is a wrapper for a type.
190 /// FIXME: Types should be factored much better so that CV qualifiers and
191 /// others do not require a huge and empty descriptor full of zeros.
192 class DIType : public DIDescriptor {
195 FlagPrivate = 1 << 0,
196 FlagProtected = 1 << 1,
197 FlagFwdDecl = 1 << 2,
198 FlagAppleBlock = 1 << 3,
199 FlagBlockByrefStruct = 1 << 4
203 DIType(MDNode *N, unsigned Tag)
204 : DIDescriptor(N, Tag) {}
205 // This ctor is used when the Tag has already been validated by a derived
207 DIType(MDNode *N, bool, bool) : DIDescriptor(N) {}
211 /// Verify - Verify that a type descriptor is well formed.
214 explicit DIType(MDNode *N);
218 DIDescriptor getContext() const { return getDescriptorField(1); }
219 const std::string &getName(std::string &F) const {
220 return getStringField(2, F);
222 DICompileUnit getCompileUnit() const{ return getFieldAs<DICompileUnit>(3); }
223 unsigned getLineNumber() const { return getUnsignedField(4); }
224 uint64_t getSizeInBits() const { return getUInt64Field(5); }
225 uint64_t getAlignInBits() const { return getUInt64Field(6); }
226 // FIXME: Offset is only used for DW_TAG_member nodes. Making every type
227 // carry this is just plain insane.
228 uint64_t getOffsetInBits() const { return getUInt64Field(7); }
229 unsigned getFlags() const { return getUnsignedField(8); }
230 bool isPrivate() const {
231 return (getFlags() & FlagPrivate) != 0;
233 bool isProtected() const {
234 return (getFlags() & FlagProtected) != 0;
236 bool isForwardDecl() const {
237 return (getFlags() & FlagFwdDecl) != 0;
239 // isAppleBlock - Return true if this is the Apple Blocks extension.
240 bool isAppleBlockExtension() const {
241 return (getFlags() & FlagAppleBlock) != 0;
243 bool isBlockByrefStruct() const {
244 return (getFlags() & FlagBlockByrefStruct) != 0;
247 /// dump - print type.
251 /// DIBasicType - A basic type, like 'int' or 'float'.
252 class DIBasicType : public DIType {
254 explicit DIBasicType(MDNode *N = 0)
255 : DIType(N, dwarf::DW_TAG_base_type) {}
257 unsigned getEncoding() const { return getUnsignedField(9); }
259 /// dump - print basic type.
263 /// DIDerivedType - A simple derived type, like a const qualified type,
264 /// a typedef, a pointer or reference, etc.
265 class DIDerivedType : public DIType {
267 explicit DIDerivedType(MDNode *N, bool, bool)
268 : DIType(N, true, true) {}
270 explicit DIDerivedType(MDNode *N = 0)
271 : DIType(N, true, true) {
272 if (DbgNode && !isDerivedType())
276 DIType getTypeDerivedFrom() const { return getFieldAs<DIType>(9); }
278 /// getOriginalTypeSize - If this type is derived from a base type then
279 /// return base type size.
280 uint64_t getOriginalTypeSize() const;
281 /// dump - print derived type.
284 /// replaceAllUsesWith - Replace all uses of debug info referenced by
285 /// this descriptor. After this completes, the current debug info value
287 void replaceAllUsesWith(DIDescriptor &D);
290 /// DICompositeType - This descriptor holds a type that can refer to multiple
291 /// other types, like a function or struct.
292 /// FIXME: Why is this a DIDerivedType??
293 class DICompositeType : public DIDerivedType {
295 explicit DICompositeType(MDNode *N = 0)
296 : DIDerivedType(N, true, true) {
297 if (N && !isCompositeType())
301 DIArray getTypeArray() const { return getFieldAs<DIArray>(10); }
302 unsigned getRunTimeLang() const { return getUnsignedField(11); }
304 /// Verify - Verify that a composite type descriptor is well formed.
307 /// dump - print composite type.
311 /// DIGlobal - This is a common class for global variables and subprograms.
312 class DIGlobal : public DIDescriptor {
314 explicit DIGlobal(MDNode *N, unsigned RequiredTag)
315 : DIDescriptor(N, RequiredTag) {}
318 virtual ~DIGlobal() {}
320 DIDescriptor getContext() const { return getDescriptorField(2); }
321 const std::string &getName(std::string &F) const {
322 return getStringField(3, F);
324 const std::string &getDisplayName(std::string &F) const {
325 return getStringField(4, F);
327 const std::string &getLinkageName(std::string &F) const {
328 return getStringField(5, F);
330 DICompileUnit getCompileUnit() const{ return getFieldAs<DICompileUnit>(6); }
331 unsigned getLineNumber() const { return getUnsignedField(7); }
332 DIType getType() const { return getFieldAs<DIType>(8); }
334 /// isLocalToUnit - Return true if this subprogram is local to the current
335 /// compile unit, like 'static' in C.
336 unsigned isLocalToUnit() const { return getUnsignedField(9); }
337 unsigned isDefinition() const { return getUnsignedField(10); }
339 /// dump - print global.
343 /// DISubprogram - This is a wrapper for a subprogram (e.g. a function).
344 class DISubprogram : public DIGlobal {
346 explicit DISubprogram(MDNode *N = 0)
347 : DIGlobal(N, dwarf::DW_TAG_subprogram) {}
349 DICompositeType getType() const { return getFieldAs<DICompositeType>(8); }
351 /// getReturnTypeName - Subprogram return types are encoded either as
352 /// DIType or as DICompositeType.
353 const std::string &getReturnTypeName(std::string &F) const {
354 DICompositeType DCT(getFieldAs<DICompositeType>(8));
356 DIArray A = DCT.getTypeArray();
357 DIType T(A.getElement(0).getNode());
360 DIType T(getFieldAs<DIType>(8));
364 /// Verify - Verify that a subprogram descriptor is well formed.
367 /// dump - print subprogram.
370 /// describes - Return true if this subprogram provides debugging
371 /// information for the function F.
372 bool describes(const Function *F);
375 /// DIGlobalVariable - This is a wrapper for a global variable.
376 class DIGlobalVariable : public DIGlobal {
378 explicit DIGlobalVariable(MDNode *N = 0)
379 : DIGlobal(N, dwarf::DW_TAG_variable) {}
381 GlobalVariable *getGlobal() const { return getGlobalVariableField(11); }
383 /// Verify - Verify that a global variable descriptor is well formed.
386 /// dump - print global variable.
390 /// DIVariable - This is a wrapper for a variable (e.g. parameter, local,
392 class DIVariable : public DIDescriptor {
394 explicit DIVariable(MDNode *N = 0)
396 if (DbgNode && !isVariable())
400 DIDescriptor getContext() const { return getDescriptorField(1); }
401 const std::string &getName(std::string &F) const {
402 return getStringField(2, F);
404 DICompileUnit getCompileUnit() const{ return getFieldAs<DICompileUnit>(3); }
405 unsigned getLineNumber() const { return getUnsignedField(4); }
406 DIType getType() const { return getFieldAs<DIType>(5); }
409 /// Verify - Verify that a variable descriptor is well formed.
412 /// isBlockByrefVariable - Return true if the variable was declared as
413 /// a "__block" variable (Apple Blocks).
414 bool isBlockByrefVariable() const {
415 return getType().isBlockByrefStruct();
418 /// dump - print variable.
422 /// DIBlock - This is a wrapper for a block (e.g. a function, scope, etc).
423 class DIBlock : public DIDescriptor {
425 explicit DIBlock(MDNode *N = 0)
426 : DIDescriptor(N, dwarf::DW_TAG_lexical_block) {}
428 DIDescriptor getContext() const { return getDescriptorField(1); }
431 /// DIFactory - This object assists with the construction of the various
435 LLVMContext& VMContext;
437 // Cached values for uniquing and faster lookups.
438 const Type *EmptyStructPtr; // "{}*".
439 Function *StopPointFn; // llvm.dbg.stoppoint
440 Function *FuncStartFn; // llvm.dbg.func.start
441 Function *RegionStartFn; // llvm.dbg.region.start
442 Function *RegionEndFn; // llvm.dbg.region.end
443 Function *DeclareFn; // llvm.dbg.declare
444 StringMap<Constant*> StringCache;
445 DenseMap<Constant*, DIDescriptor> SimpleConstantCache;
447 DIFactory(const DIFactory &); // DO NOT IMPLEMENT
448 void operator=(const DIFactory&); // DO NOT IMPLEMENT
450 explicit DIFactory(Module &m);
452 /// GetOrCreateArray - Create an descriptor for an array of descriptors.
453 /// This implicitly uniques the arrays created.
454 DIArray GetOrCreateArray(DIDescriptor *Tys, unsigned NumTys);
456 /// GetOrCreateSubrange - Create a descriptor for a value range. This
457 /// implicitly uniques the values returned.
458 DISubrange GetOrCreateSubrange(int64_t Lo, int64_t Hi);
460 /// CreateCompileUnit - Create a new descriptor for the specified compile
462 DICompileUnit CreateCompileUnit(unsigned LangID,
463 const std::string &Filename,
464 const std::string &Directory,
465 const std::string &Producer,
467 bool isOptimized = false,
468 const char *Flags = "",
469 unsigned RunTimeVer = 0);
471 /// CreateEnumerator - Create a single enumerator value.
472 DIEnumerator CreateEnumerator(const std::string &Name, uint64_t Val);
474 /// CreateBasicType - Create a basic type like int, float, etc.
475 DIBasicType CreateBasicType(DIDescriptor Context, const std::string &Name,
476 DICompileUnit CompileUnit, unsigned LineNumber,
477 uint64_t SizeInBits, uint64_t AlignInBits,
478 uint64_t OffsetInBits, unsigned Flags,
481 /// CreateDerivedType - Create a derived type like const qualified type,
482 /// pointer, typedef, etc.
483 DIDerivedType CreateDerivedType(unsigned Tag, DIDescriptor Context,
484 const std::string &Name,
485 DICompileUnit CompileUnit,
487 uint64_t SizeInBits, uint64_t AlignInBits,
488 uint64_t OffsetInBits, unsigned Flags,
491 /// CreateCompositeType - Create a composite type like array, struct, etc.
492 DICompositeType CreateCompositeType(unsigned Tag, DIDescriptor Context,
493 const std::string &Name,
494 DICompileUnit CompileUnit,
497 uint64_t AlignInBits,
498 uint64_t OffsetInBits, unsigned Flags,
501 unsigned RunTimeLang = 0);
503 /// CreateSubprogram - Create a new descriptor for the specified subprogram.
504 /// See comments in DISubprogram for descriptions of these fields.
505 DISubprogram CreateSubprogram(DIDescriptor Context, const std::string &Name,
506 const std::string &DisplayName,
507 const std::string &LinkageName,
508 DICompileUnit CompileUnit, unsigned LineNo,
509 DIType Type, bool isLocalToUnit,
512 /// CreateGlobalVariable - Create a new descriptor for the specified global.
514 CreateGlobalVariable(DIDescriptor Context, const std::string &Name,
515 const std::string &DisplayName,
516 const std::string &LinkageName,
517 DICompileUnit CompileUnit,
518 unsigned LineNo, DIType Type, bool isLocalToUnit,
519 bool isDefinition, llvm::GlobalVariable *GV);
521 /// CreateVariable - Create a new descriptor for the specified variable.
522 DIVariable CreateVariable(unsigned Tag, DIDescriptor Context,
523 const std::string &Name,
524 DICompileUnit CompileUnit, unsigned LineNo,
527 /// CreateBlock - This creates a descriptor for a lexical block with the
528 /// specified parent context.
529 DIBlock CreateBlock(DIDescriptor Context);
531 /// InsertStopPoint - Create a new llvm.dbg.stoppoint intrinsic invocation,
532 /// inserting it at the end of the specified basic block.
533 void InsertStopPoint(DICompileUnit CU, unsigned LineNo, unsigned ColNo,
536 /// InsertSubprogramStart - Create a new llvm.dbg.func.start intrinsic to
537 /// mark the start of the specified subprogram.
538 void InsertSubprogramStart(DISubprogram SP, BasicBlock *BB);
540 /// InsertRegionStart - Insert a new llvm.dbg.region.start intrinsic call to
541 /// mark the start of a region for the specified scoping descriptor.
542 void InsertRegionStart(DIDescriptor D, BasicBlock *BB);
544 /// InsertRegionEnd - Insert a new llvm.dbg.region.end intrinsic call to
545 /// mark the end of a region for the specified scoping descriptor.
546 void InsertRegionEnd(DIDescriptor D, BasicBlock *BB);
548 /// InsertDeclare - Insert a new llvm.dbg.declare intrinsic call.
549 void InsertDeclare(llvm::Value *Storage, DIVariable D, BasicBlock *BB);
552 Constant *GetTagConstant(unsigned TAG);
555 /// Finds the stoppoint coressponding to this instruction, that is the
556 /// stoppoint that dominates this instruction
557 const DbgStopPointInst *findStopPoint(const Instruction *Inst);
559 /// Finds the stoppoint corresponding to first real (non-debug intrinsic)
560 /// instruction in this Basic Block, and returns the stoppoint for it.
561 const DbgStopPointInst *findBBStopPoint(const BasicBlock *BB);
563 /// Finds the dbg.declare intrinsic corresponding to this value if any.
564 /// It looks through pointer casts too.
565 const DbgDeclareInst *findDbgDeclare(const Value *V, bool stripCasts = true);
567 /// Find the debug info descriptor corresponding to this global variable.
568 Value *findDbgGlobalDeclare(GlobalVariable *V);
570 bool getLocationInfo(const Value *V, std::string &DisplayName,
571 std::string &Type, unsigned &LineNo, std::string &File,
574 /// isValidDebugInfoIntrinsic - Return true if SPI is a valid debug
576 bool isValidDebugInfoIntrinsic(DbgStopPointInst &SPI,
577 CodeGenOpt::Level OptLev);
579 /// isValidDebugInfoIntrinsic - Return true if FSI is a valid debug
581 bool isValidDebugInfoIntrinsic(DbgFuncStartInst &FSI,
582 CodeGenOpt::Level OptLev);
584 /// isValidDebugInfoIntrinsic - Return true if RSI is a valid debug
586 bool isValidDebugInfoIntrinsic(DbgRegionStartInst &RSI,
587 CodeGenOpt::Level OptLev);
589 /// isValidDebugInfoIntrinsic - Return true if REI is a valid debug
591 bool isValidDebugInfoIntrinsic(DbgRegionEndInst &REI,
592 CodeGenOpt::Level OptLev);
594 /// isValidDebugInfoIntrinsic - Return true if DI is a valid debug
596 bool isValidDebugInfoIntrinsic(DbgDeclareInst &DI,
597 CodeGenOpt::Level OptLev);
599 /// ExtractDebugLocation - Extract debug location information
600 /// from llvm.dbg.stoppoint intrinsic.
601 DebugLoc ExtractDebugLocation(DbgStopPointInst &SPI,
602 DebugLocTracker &DebugLocInfo);
604 /// ExtractDebugLocation - Extract debug location information
605 /// from llvm.dbg.func_start intrinsic.
606 DebugLoc ExtractDebugLocation(DbgFuncStartInst &FSI,
607 DebugLocTracker &DebugLocInfo);
609 /// isInlinedFnStart - Return true if FSI is starting an inlined function.
610 bool isInlinedFnStart(DbgFuncStartInst &FSI, const Function *CurrentFn);
612 /// isInlinedFnEnd - Return true if REI is ending an inlined function.
613 bool isInlinedFnEnd(DbgRegionEndInst &REI, const Function *CurrentFn);
614 /// DebugInfoFinder - This object collects DebugInfo from a module.
615 class DebugInfoFinder {
618 /// processModule - Process entire module and collect debug info
620 void processModule(Module &M);
623 /// processType - Process DIType.
624 void processType(DIType DT);
626 /// processSubprogram - Enumberate DISubprogram.
627 void processSubprogram(DISubprogram SP);
629 /// processStopPoint - Process DbgStopPointInst.
630 void processStopPoint(DbgStopPointInst *SPI);
632 /// processFuncStart - Process DbgFuncStartInst.
633 void processFuncStart(DbgFuncStartInst *FSI);
635 /// processRegionStart - Process DbgRegionStart.
636 void processRegionStart(DbgRegionStartInst *DRS);
638 /// processRegionEnd - Process DbgRegionEnd.
639 void processRegionEnd(DbgRegionEndInst *DRE);
641 /// processDeclare - Process DbgDeclareInst.
642 void processDeclare(DbgDeclareInst *DDI);
644 /// addCompileUnit - Add compile unit into CUs.
645 bool addCompileUnit(DICompileUnit CU);
647 /// addGlobalVariable - Add global variable into GVs.
648 bool addGlobalVariable(DIGlobalVariable DIG);
650 // addSubprogram - Add subprgoram into SPs.
651 bool addSubprogram(DISubprogram SP);
653 /// addType - Add type into Tys.
654 bool addType(DIType DT);
657 typedef SmallVector<MDNode *, 8>::iterator iterator;
658 iterator compile_unit_begin() { return CUs.begin(); }
659 iterator compile_unit_end() { return CUs.end(); }
660 iterator subprogram_begin() { return SPs.begin(); }
661 iterator subprogram_end() { return SPs.end(); }
662 iterator global_variable_begin() { return GVs.begin(); }
663 iterator global_variable_end() { return GVs.end(); }
664 iterator type_begin() { return TYs.begin(); }
665 iterator type_end() { return TYs.end(); }
667 unsigned compile_unit_count() { return CUs.size(); }
668 unsigned global_variable_count() { return GVs.size(); }
669 unsigned subprogram_count() { return SPs.size(); }
670 unsigned type_count() { return TYs.size(); }
673 SmallVector<MDNode *, 8> CUs; // Compile Units
674 SmallVector<MDNode *, 8> SPs; // Subprograms
675 SmallVector<MDNode *, 8> GVs; // Global Variables;
676 SmallVector<MDNode *, 8> TYs; // Types
677 SmallPtrSet<MDNode *, 64> NodesSeen;
679 } // end namespace llvm