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.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_SUPPORT_DEBUGINFO_H
16 #define LLVM_SUPPORT_DEBUGINFO_H
18 #include "llvm/ADT/StringMap.h"
19 #include "llvm/ADT/DenseMap.h"
20 #include "llvm/Support/Dwarf.h"
30 class DbgStopPointInst;
37 Version7 = 7 << 16, // Current version of debug information.
38 Version6 = 6 << 16, // Constant for version 6.
39 Version5 = 5 << 16, // Constant for version 5.
40 Version4 = 4 << 16, // Constant for version 4.
41 VersionMask = 0xffff0000 // Mask for version number.
47 /// DIDescriptor constructor. If the specified GV is non-null, this checks
48 /// to make sure that the tag in the descriptor matches 'RequiredTag'. If
49 /// not, the debug info is corrupt and we ignore it.
50 DIDescriptor(GlobalVariable *GV, unsigned RequiredTag);
52 std::string getStringField(unsigned Elt) const;
53 unsigned getUnsignedField(unsigned Elt) const {
54 return (unsigned)getUInt64Field(Elt);
56 uint64_t getUInt64Field(unsigned Elt) const;
57 DIDescriptor getDescriptorField(unsigned Elt) const;
59 template <typename DescTy>
60 DescTy getFieldAs(unsigned Elt) const {
61 return DescTy(getDescriptorField(Elt).getGV());
64 GlobalVariable *getGlobalVariableField(unsigned Elt) const;
67 explicit DIDescriptor() : GV(0) {}
68 explicit DIDescriptor(GlobalVariable *gv) : GV(gv) {}
70 bool isNull() const { return GV == 0; }
72 GlobalVariable *getGV() const { return GV; }
74 unsigned getVersion() const {
75 return getUnsignedField(0) & VersionMask;
78 unsigned getTag() const {
79 return getUnsignedField(0) & ~VersionMask;
83 /// DIAnchor - A wrapper for various anchor descriptors.
84 class DIAnchor : public DIDescriptor {
86 explicit DIAnchor(GlobalVariable *GV = 0);
88 unsigned getAnchorTag() const { return getUnsignedField(1); }
91 /// DISubrange - This is used to represent ranges, for array bounds.
92 class DISubrange : public DIDescriptor {
94 explicit DISubrange(GlobalVariable *GV = 0);
96 int64_t getLo() const { return (int64_t)getUInt64Field(1); }
97 int64_t getHi() const { return (int64_t)getUInt64Field(2); }
100 /// DIArray - This descriptor holds an array of descriptors.
101 class DIArray : public DIDescriptor {
103 explicit DIArray(GlobalVariable *GV = 0) : DIDescriptor(GV) {}
105 unsigned getNumElements() const;
106 DIDescriptor getElement(unsigned Idx) const {
107 return getDescriptorField(Idx);
111 /// DICompileUnit - A wrapper for a compile unit.
112 class DICompileUnit : public DIDescriptor {
114 explicit DICompileUnit(GlobalVariable *GV = 0);
116 unsigned getLanguage() const { return getUnsignedField(2); }
117 std::string getFilename() const { return getStringField(3); }
118 std::string getDirectory() const { return getStringField(4); }
119 std::string getProducer() const { return getStringField(5); }
122 /// DIEnumerator - A wrapper for an enumerator (e.g. X and Y in 'enum {X,Y}').
123 /// FIXME: it seems strange that this doesn't have either a reference to the
124 /// type/precision or a file/line pair for location info.
125 class DIEnumerator : public DIDescriptor {
127 explicit DIEnumerator(GlobalVariable *GV = 0);
129 std::string getName() const { return getStringField(1); }
130 uint64_t getEnumValue() const { return getUInt64Field(2); }
133 /// DIType - This is a wrapper for a type.
134 /// FIXME: Types should be factored much better so that CV qualifiers and
135 /// others do not require a huge and empty descriptor full of zeros.
136 class DIType : public DIDescriptor {
138 DIType(GlobalVariable *GV, unsigned Tag) : DIDescriptor(GV, Tag) {}
139 // This ctor is used when the Tag has already been validated by a derived
141 DIType(GlobalVariable *GV, bool, bool) : DIDescriptor(GV) {}
144 /// isDerivedType - Return true if the specified tag is legal for
146 static bool isDerivedType(unsigned TAG);
148 /// isCompositeType - Return true if the specified tag is legal for
150 static bool isCompositeType(unsigned TAG);
152 /// isBasicType - Return true if the specified tag is legal for
154 static bool isBasicType(unsigned TAG) {
155 return TAG == dwarf::DW_TAG_base_type;
159 explicit DIType(GlobalVariable *GV);
163 DIDescriptor getContext() const { return getDescriptorField(1); }
164 std::string getName() const { return getStringField(2); }
165 DICompileUnit getCompileUnit() const{ return getFieldAs<DICompileUnit>(3); }
166 unsigned getLineNumber() const { return getUnsignedField(4); }
167 uint64_t getSizeInBits() const { return getUInt64Field(5); }
168 uint64_t getAlignInBits() const { return getUInt64Field(6); }
169 // FIXME: Offset is only used for DW_TAG_member nodes. Making every type
170 // carry this is just plain insane.
171 uint64_t getOffsetInBits() const { return getUInt64Field(7); }
172 unsigned getFlags() const { return getUnsignedField(8); }
174 virtual std::string getFilename() const {
175 assert (0 && "Invalid DIDescriptor");
179 virtual std::string getDirectory() const {
180 assert (0 && "Invalid DIDescriptor");
185 /// DIBasicType - A basic type, like 'int' or 'float'.
186 class DIBasicType : public DIType {
188 explicit DIBasicType(GlobalVariable *GV);
190 unsigned getEncoding() const { return getUnsignedField(9); }
191 std::string getFilename() const { return getStringField(10); }
192 std::string getDirectory() const { return getStringField(11); }
195 /// DIDerivedType - A simple derived type, like a const qualified type,
196 /// a typedef, a pointer or reference, etc.
197 class DIDerivedType : public DIType {
199 explicit DIDerivedType(GlobalVariable *GV, bool, bool)
200 : DIType(GV, true, true) {}
202 explicit DIDerivedType(GlobalVariable *GV);
204 DIType getTypeDerivedFrom() const { return getFieldAs<DIType>(9); }
205 std::string getFilename() const { return getStringField(10); }
206 std::string getDirectory() const { return getStringField(11); }
210 /// DICompositeType - This descriptor holds a type that can refer to multiple
211 /// other types, like a function or struct.
212 /// FIXME: Why is this a DIDerivedType??
213 class DICompositeType : public DIDerivedType {
215 explicit DICompositeType(GlobalVariable *GV);
217 DIArray getTypeArray() const { return getFieldAs<DIArray>(10); }
218 std::string getFilename() const { return getStringField(11); }
219 std::string getDirectory() const { return getStringField(12); }
222 /// DIGlobal - This is a common class for global variables and subprograms.
223 class DIGlobal : public DIDescriptor {
225 explicit DIGlobal(GlobalVariable *GV, unsigned RequiredTag)
226 : DIDescriptor(GV, RequiredTag) {}
228 /// isSubprogram - Return true if the specified tag is legal for
230 static bool isSubprogram(unsigned TAG) {
231 return TAG == dwarf::DW_TAG_subprogram;
234 /// isGlobalVariable - Return true if the specified tag is legal for
235 /// DIGlobalVariable.
236 static bool isGlobalVariable(unsigned TAG) {
237 return TAG == dwarf::DW_TAG_variable;
241 virtual ~DIGlobal() {}
243 DIDescriptor getContext() const { return getDescriptorField(2); }
244 std::string getName() const { return getStringField(3); }
245 std::string getDisplayName() const { return getStringField(4); }
246 std::string getLinkageName() const { return getStringField(5); }
248 DICompileUnit getCompileUnit() const{ return getFieldAs<DICompileUnit>(6); }
249 unsigned getLineNumber() const { return getUnsignedField(7); }
250 DIType getType() const { return getFieldAs<DIType>(8); }
252 /// isLocalToUnit - Return true if this subprogram is local to the current
253 /// compile unit, like 'static' in C.
254 unsigned isLocalToUnit() const { return getUnsignedField(9); }
255 unsigned isDefinition() const { return getUnsignedField(10); }
257 virtual std::string getFilename() const {
258 assert (0 && "Invalid DIDescriptor");
262 virtual std::string getDirectory() const {
263 assert (0 && "Invalid DIDescriptor");
269 /// DISubprogram - This is a wrapper for a subprogram (e.g. a function).
270 class DISubprogram : public DIGlobal {
272 explicit DISubprogram(GlobalVariable *GV = 0);
273 std::string getFilename() const { return getStringField(11); }
274 std::string getDirectory() const { return getStringField(12); }
275 DICompositeType getType() const { return getFieldAs<DICompositeType>(8); }
278 /// DIGlobalVariable - This is a wrapper for a global variable.
279 class DIGlobalVariable : public DIGlobal {
281 explicit DIGlobalVariable(GlobalVariable *GV = 0);
283 GlobalVariable *getGlobal() const { return getGlobalVariableField(11); }
284 std::string getFilename() const { return getStringField(12); }
285 std::string getDirectory() const { return getStringField(13); }
289 /// DIVariable - This is a wrapper for a variable (e.g. parameter, local,
291 class DIVariable : public DIDescriptor {
293 explicit DIVariable(GlobalVariable *GV = 0);
295 DIDescriptor getContext() const { return getDescriptorField(1); }
296 std::string getName() const { return getStringField(2); }
298 DICompileUnit getCompileUnit() const{ return getFieldAs<DICompileUnit>(3); }
299 unsigned getLineNumber() const { return getUnsignedField(4); }
300 DIType getType() const { return getFieldAs<DIType>(5); }
301 std::string getFilename() const { return getStringField(6); }
302 std::string getDirectory() const { return getStringField(7); }
304 /// isVariable - Return true if the specified tag is legal for DIVariable.
305 static bool isVariable(unsigned Tag);
309 /// DIBlock - This is a wrapper for a block (e.g. a function, scope, etc).
310 class DIBlock : public DIDescriptor {
312 explicit DIBlock(GlobalVariable *GV = 0);
314 DIDescriptor getContext() const { return getDescriptorField(1); }
317 /// DIFactory - This object assists with the construction of the various
321 // Cached values for uniquing and faster lookups.
322 DIAnchor CompileUnitAnchor, SubProgramAnchor, GlobalVariableAnchor;
323 const Type *EmptyStructPtr; // "{}*".
324 Function *StopPointFn; // llvm.dbg.stoppoint
325 Function *FuncStartFn; // llvm.dbg.func.start
326 Function *RegionStartFn; // llvm.dbg.region.start
327 Function *RegionEndFn; // llvm.dbg.region.end
328 Function *DeclareFn; // llvm.dbg.declare
329 StringMap<Constant*> StringCache;
330 DenseMap<Constant*, DIDescriptor> SimpleConstantCache;
332 DIFactory(const DIFactory &); // DO NOT IMPLEMENT
333 void operator=(const DIFactory&); // DO NOT IMPLEMENT
335 explicit DIFactory(Module &m);
337 /// GetOrCreateCompileUnitAnchor - Return the anchor for compile units,
338 /// creating a new one if there isn't already one in the module.
339 DIAnchor GetOrCreateCompileUnitAnchor();
341 /// GetOrCreateSubprogramAnchor - Return the anchor for subprograms,
342 /// creating a new one if there isn't already one in the module.
343 DIAnchor GetOrCreateSubprogramAnchor();
345 /// GetOrCreateGlobalVariableAnchor - Return the anchor for globals,
346 /// creating a new one if there isn't already one in the module.
347 DIAnchor GetOrCreateGlobalVariableAnchor();
349 /// GetOrCreateArray - Create an descriptor for an array of descriptors.
350 /// This implicitly uniques the arrays created.
351 DIArray GetOrCreateArray(DIDescriptor *Tys, unsigned NumTys);
353 /// GetOrCreateSubrange - Create a descriptor for a value range. This
354 /// implicitly uniques the values returned.
355 DISubrange GetOrCreateSubrange(int64_t Lo, int64_t Hi);
358 /// CreateCompileUnit - Create a new descriptor for the specified compile
360 DICompileUnit CreateCompileUnit(unsigned LangID,
361 const std::string &Filename,
362 const std::string &Directory,
363 const std::string &Producer);
365 /// CreateEnumerator - Create a single enumerator value.
366 DIEnumerator CreateEnumerator(const std::string &Name, uint64_t Val);
368 /// CreateBasicType - Create a basic type like int, float, etc.
369 DIBasicType CreateBasicType(DIDescriptor Context, const std::string &Name,
370 DICompileUnit CompileUnit, unsigned LineNumber,
371 uint64_t SizeInBits, uint64_t AlignInBits,
372 uint64_t OffsetInBits, unsigned Flags,
374 const std::string *FileName = 0,
375 const std::string *Directory = 0);
377 /// CreateDerivedType - Create a derived type like const qualified type,
378 /// pointer, typedef, etc.
379 DIDerivedType CreateDerivedType(unsigned Tag, DIDescriptor Context,
380 const std::string &Name,
381 DICompileUnit CompileUnit,
383 uint64_t SizeInBits, uint64_t AlignInBits,
384 uint64_t OffsetInBits, unsigned Flags,
386 const std::string *FileName = 0,
387 const std::string *Directory = 0);
389 /// CreateCompositeType - Create a composite type like array, struct, etc.
390 DICompositeType CreateCompositeType(unsigned Tag, DIDescriptor Context,
391 const std::string &Name,
392 DICompileUnit CompileUnit,
395 uint64_t AlignInBits,
396 uint64_t OffsetInBits, unsigned Flags,
399 const std::string *FileName = 0,
400 const std::string *Directory = 0);
402 /// CreateSubprogram - Create a new descriptor for the specified subprogram.
403 /// See comments in DISubprogram for descriptions of these fields.
404 DISubprogram CreateSubprogram(DIDescriptor Context, const std::string &Name,
405 const std::string &DisplayName,
406 const std::string &LinkageName,
407 DICompileUnit CompileUnit, unsigned LineNo,
408 DIType Type, bool isLocalToUnit,
410 const std::string *FileName = 0,
411 const std::string *Directory = 0);
413 /// CreateGlobalVariable - Create a new descriptor for the specified global.
415 CreateGlobalVariable(DIDescriptor Context, const std::string &Name,
416 const std::string &DisplayName,
417 const std::string &LinkageName,
418 DICompileUnit CompileUnit,
419 unsigned LineNo, DIType Type, bool isLocalToUnit,
420 bool isDefinition, llvm::GlobalVariable *GV,
421 const std::string *FileName = 0,
422 const std::string *Directory = 0);
425 /// CreateVariable - Create a new descriptor for the specified variable.
426 DIVariable CreateVariable(unsigned Tag, DIDescriptor Context,
427 const std::string &Name,
428 DICompileUnit CompileUnit, unsigned LineNo,
430 const std::string *FileName = 0,
431 const std::string *Directory = 0);
433 /// CreateBlock - This creates a descriptor for a lexical block with the
434 /// specified parent context.
435 DIBlock CreateBlock(DIDescriptor Context);
437 /// InsertStopPoint - Create a new llvm.dbg.stoppoint intrinsic invocation,
438 /// inserting it at the end of the specified basic block.
439 void InsertStopPoint(DICompileUnit CU, unsigned LineNo, unsigned ColNo,
442 /// InsertSubprogramStart - Create a new llvm.dbg.func.start intrinsic to
443 /// mark the start of the specified subprogram.
444 void InsertSubprogramStart(DISubprogram SP, BasicBlock *BB);
446 /// InsertRegionStart - Insert a new llvm.dbg.region.start intrinsic call to
447 /// mark the start of a region for the specified scoping descriptor.
448 void InsertRegionStart(DIDescriptor D, BasicBlock *BB);
450 /// InsertRegionEnd - Insert a new llvm.dbg.region.end intrinsic call to
451 /// mark the end of a region for the specified scoping descriptor.
452 void InsertRegionEnd(DIDescriptor D, BasicBlock *BB);
454 /// InsertDeclare - Insert a new llvm.dbg.declare intrinsic call.
455 void InsertDeclare(llvm::Value *Storage, DIVariable D, BasicBlock *BB);
458 Constant *GetTagConstant(unsigned TAG);
459 Constant *GetStringConstant(const std::string &String);
460 DIAnchor GetOrCreateAnchor(unsigned TAG, const char *Name);
462 /// getCastToEmpty - Return the descriptor as a Constant* with type '{}*'.
463 Constant *getCastToEmpty(DIDescriptor D);
466 /// Finds the stoppoint coressponding to this instruction, that is the
467 /// stoppoint that dominates this instruction
468 const DbgStopPointInst *findStopPoint(const Instruction *Inst);
470 /// Finds the stoppoint corresponding to first real (non-debug intrinsic)
471 /// instruction in this Basic Block, and returns the stoppoint for it.
472 const DbgStopPointInst *findBBStopPoint(const BasicBlock *BB);
474 /// Finds the dbg.declare intrinsic corresponding to this value if any.
475 /// It looks through pointer casts too.
476 const DbgDeclareInst *findDbgDeclare(const Value *V, bool stripCasts = true);
477 } // end namespace llvm