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;
84 /// DIAnchor - A wrapper for various anchor descriptors.
85 class DIAnchor : public DIDescriptor {
87 explicit DIAnchor(GlobalVariable *GV = 0);
89 unsigned getAnchorTag() const { return getUnsignedField(1); }
92 /// DISubrange - This is used to represent ranges, for array bounds.
93 class DISubrange : public DIDescriptor {
95 explicit DISubrange(GlobalVariable *GV = 0);
97 int64_t getLo() const { return (int64_t)getUInt64Field(1); }
98 int64_t getHi() const { return (int64_t)getUInt64Field(2); }
101 /// DIArray - This descriptor holds an array of descriptors.
102 class DIArray : public DIDescriptor {
104 explicit DIArray(GlobalVariable *GV = 0) : DIDescriptor(GV) {}
106 unsigned getNumElements() const;
107 DIDescriptor getElement(unsigned Idx) const {
108 return getDescriptorField(Idx);
112 /// DICompileUnit - A wrapper for a compile unit.
113 class DICompileUnit : public DIDescriptor {
115 explicit DICompileUnit(GlobalVariable *GV = 0);
117 unsigned getLanguage() const { return getUnsignedField(2); }
118 std::string getFilename() const { return getStringField(3); }
119 std::string getDirectory() const { return getStringField(4); }
120 std::string getProducer() const { return getStringField(5); }
122 /// Verify - Verify that a compile unit is well formed.
126 /// DIEnumerator - A wrapper for an enumerator (e.g. X and Y in 'enum {X,Y}').
127 /// FIXME: it seems strange that this doesn't have either a reference to the
128 /// type/precision or a file/line pair for location info.
129 class DIEnumerator : public DIDescriptor {
131 explicit DIEnumerator(GlobalVariable *GV = 0);
133 std::string getName() const { return getStringField(1); }
134 uint64_t getEnumValue() const { return getUInt64Field(2); }
137 /// DIType - This is a wrapper for a type.
138 /// FIXME: Types should be factored much better so that CV qualifiers and
139 /// others do not require a huge and empty descriptor full of zeros.
140 class DIType : public DIDescriptor {
142 DIType(GlobalVariable *GV, unsigned Tag) : DIDescriptor(GV, Tag) {}
143 // This ctor is used when the Tag has already been validated by a derived
145 DIType(GlobalVariable *GV, bool, bool) : DIDescriptor(GV) {}
148 /// isDerivedType - Return true if the specified tag is legal for
150 static bool isDerivedType(unsigned TAG);
152 /// isCompositeType - Return true if the specified tag is legal for
154 static bool isCompositeType(unsigned TAG);
156 /// isBasicType - Return true if the specified tag is legal for
158 static bool isBasicType(unsigned TAG) {
159 return TAG == dwarf::DW_TAG_base_type;
162 /// Verify - Verify that a type descriptor is well formed.
165 explicit DIType(GlobalVariable *GV);
169 DIDescriptor getContext() const { return getDescriptorField(1); }
170 std::string getName() const { return getStringField(2); }
171 DICompileUnit getCompileUnit() const{ return getFieldAs<DICompileUnit>(3); }
172 unsigned getLineNumber() const { return getUnsignedField(4); }
173 uint64_t getSizeInBits() const { return getUInt64Field(5); }
174 uint64_t getAlignInBits() const { return getUInt64Field(6); }
175 // FIXME: Offset is only used for DW_TAG_member nodes. Making every type
176 // carry this is just plain insane.
177 uint64_t getOffsetInBits() const { return getUInt64Field(7); }
178 unsigned getFlags() const { return getUnsignedField(8); }
180 virtual std::string getFilename() const {
181 assert (0 && "Invalid DIDescriptor");
185 virtual std::string getDirectory() const {
186 assert (0 && "Invalid DIDescriptor");
191 /// DIBasicType - A basic type, like 'int' or 'float'.
192 class DIBasicType : public DIType {
194 explicit DIBasicType(GlobalVariable *GV);
196 unsigned getEncoding() const { return getUnsignedField(9); }
197 std::string getFilename() const { return getStringField(10); }
198 std::string getDirectory() const { return getStringField(11); }
201 /// DIDerivedType - A simple derived type, like a const qualified type,
202 /// a typedef, a pointer or reference, etc.
203 class DIDerivedType : public DIType {
205 explicit DIDerivedType(GlobalVariable *GV, bool, bool)
206 : DIType(GV, true, true) {}
208 explicit DIDerivedType(GlobalVariable *GV);
210 DIType getTypeDerivedFrom() const { return getFieldAs<DIType>(9); }
211 std::string getFilename() const { return getStringField(10); }
212 std::string getDirectory() const { return getStringField(11); }
216 /// DICompositeType - This descriptor holds a type that can refer to multiple
217 /// other types, like a function or struct.
218 /// FIXME: Why is this a DIDerivedType??
219 class DICompositeType : public DIDerivedType {
221 explicit DICompositeType(GlobalVariable *GV);
223 DIArray getTypeArray() const { return getFieldAs<DIArray>(10); }
224 std::string getFilename() const { return getStringField(11); }
225 std::string getDirectory() const { return getStringField(12); }
227 /// Verify - Verify that a composite type descriptor is well formed.
231 /// DIGlobal - This is a common class for global variables and subprograms.
232 class DIGlobal : public DIDescriptor {
234 explicit DIGlobal(GlobalVariable *GV, unsigned RequiredTag)
235 : DIDescriptor(GV, RequiredTag) {}
237 /// isSubprogram - Return true if the specified tag is legal for
239 static bool isSubprogram(unsigned TAG) {
240 return TAG == dwarf::DW_TAG_subprogram;
243 /// isGlobalVariable - Return true if the specified tag is legal for
244 /// DIGlobalVariable.
245 static bool isGlobalVariable(unsigned TAG) {
246 return TAG == dwarf::DW_TAG_variable;
250 virtual ~DIGlobal() {}
252 DIDescriptor getContext() const { return getDescriptorField(2); }
253 std::string getName() const { return getStringField(3); }
254 std::string getDisplayName() const { return getStringField(4); }
255 std::string getLinkageName() const { return getStringField(5); }
257 DICompileUnit getCompileUnit() const{ return getFieldAs<DICompileUnit>(6); }
258 unsigned getLineNumber() const { return getUnsignedField(7); }
259 DIType getType() const { return getFieldAs<DIType>(8); }
261 /// isLocalToUnit - Return true if this subprogram is local to the current
262 /// compile unit, like 'static' in C.
263 unsigned isLocalToUnit() const { return getUnsignedField(9); }
264 unsigned isDefinition() const { return getUnsignedField(10); }
266 virtual std::string getFilename() const {
267 assert (0 && "Invalid DIDescriptor");
271 virtual std::string getDirectory() const {
272 assert (0 && "Invalid DIDescriptor");
278 /// DISubprogram - This is a wrapper for a subprogram (e.g. a function).
279 class DISubprogram : public DIGlobal {
281 explicit DISubprogram(GlobalVariable *GV = 0);
282 std::string getFilename() const { return getStringField(11); }
283 std::string getDirectory() const { return getStringField(12); }
284 DICompositeType getType() const { return getFieldAs<DICompositeType>(8); }
286 /// Verify - Verify that a subprogram descriptor is well formed.
290 /// DIGlobalVariable - This is a wrapper for a global variable.
291 class DIGlobalVariable : public DIGlobal {
293 explicit DIGlobalVariable(GlobalVariable *GV = 0);
295 GlobalVariable *getGlobal() const { return getGlobalVariableField(11); }
296 std::string getFilename() const { return getStringField(12); }
297 std::string getDirectory() const { return getStringField(13); }
299 /// Verify - Verify that a global variable descriptor is well formed.
304 /// DIVariable - This is a wrapper for a variable (e.g. parameter, local,
306 class DIVariable : public DIDescriptor {
308 explicit DIVariable(GlobalVariable *GV = 0);
310 DIDescriptor getContext() const { return getDescriptorField(1); }
311 std::string getName() const { return getStringField(2); }
313 DICompileUnit getCompileUnit() const{ return getFieldAs<DICompileUnit>(3); }
314 unsigned getLineNumber() const { return getUnsignedField(4); }
315 DIType getType() const { return getFieldAs<DIType>(5); }
316 std::string getFilename() const { return getStringField(6); }
317 std::string getDirectory() const { return getStringField(7); }
319 /// isVariable - Return true if the specified tag is legal for DIVariable.
320 static bool isVariable(unsigned Tag);
322 /// Verify - Verify that a variable descriptor is well formed.
327 /// DIBlock - This is a wrapper for a block (e.g. a function, scope, etc).
328 class DIBlock : public DIDescriptor {
330 explicit DIBlock(GlobalVariable *GV = 0);
332 DIDescriptor getContext() const { return getDescriptorField(1); }
335 /// DIFactory - This object assists with the construction of the various
339 // Cached values for uniquing and faster lookups.
340 DIAnchor CompileUnitAnchor, SubProgramAnchor, GlobalVariableAnchor;
341 const Type *EmptyStructPtr; // "{}*".
342 Function *StopPointFn; // llvm.dbg.stoppoint
343 Function *FuncStartFn; // llvm.dbg.func.start
344 Function *RegionStartFn; // llvm.dbg.region.start
345 Function *RegionEndFn; // llvm.dbg.region.end
346 Function *DeclareFn; // llvm.dbg.declare
347 StringMap<Constant*> StringCache;
348 DenseMap<Constant*, DIDescriptor> SimpleConstantCache;
350 DIFactory(const DIFactory &); // DO NOT IMPLEMENT
351 void operator=(const DIFactory&); // DO NOT IMPLEMENT
353 explicit DIFactory(Module &m);
355 /// GetOrCreateCompileUnitAnchor - Return the anchor for compile units,
356 /// creating a new one if there isn't already one in the module.
357 DIAnchor GetOrCreateCompileUnitAnchor();
359 /// GetOrCreateSubprogramAnchor - Return the anchor for subprograms,
360 /// creating a new one if there isn't already one in the module.
361 DIAnchor GetOrCreateSubprogramAnchor();
363 /// GetOrCreateGlobalVariableAnchor - Return the anchor for globals,
364 /// creating a new one if there isn't already one in the module.
365 DIAnchor GetOrCreateGlobalVariableAnchor();
367 /// GetOrCreateArray - Create an descriptor for an array of descriptors.
368 /// This implicitly uniques the arrays created.
369 DIArray GetOrCreateArray(DIDescriptor *Tys, unsigned NumTys);
371 /// GetOrCreateSubrange - Create a descriptor for a value range. This
372 /// implicitly uniques the values returned.
373 DISubrange GetOrCreateSubrange(int64_t Lo, int64_t Hi);
376 /// CreateCompileUnit - Create a new descriptor for the specified compile
378 DICompileUnit CreateCompileUnit(unsigned LangID,
379 const std::string &Filename,
380 const std::string &Directory,
381 const std::string &Producer);
383 /// CreateEnumerator - Create a single enumerator value.
384 DIEnumerator CreateEnumerator(const std::string &Name, uint64_t Val);
386 /// CreateBasicType - Create a basic type like int, float, etc.
387 DIBasicType CreateBasicType(DIDescriptor Context, const std::string &Name,
388 DICompileUnit CompileUnit, unsigned LineNumber,
389 uint64_t SizeInBits, uint64_t AlignInBits,
390 uint64_t OffsetInBits, unsigned Flags,
392 const std::string *FileName = 0,
393 const std::string *Directory = 0);
395 /// CreateDerivedType - Create a derived type like const qualified type,
396 /// pointer, typedef, etc.
397 DIDerivedType CreateDerivedType(unsigned Tag, DIDescriptor Context,
398 const std::string &Name,
399 DICompileUnit CompileUnit,
401 uint64_t SizeInBits, uint64_t AlignInBits,
402 uint64_t OffsetInBits, unsigned Flags,
404 const std::string *FileName = 0,
405 const std::string *Directory = 0);
407 /// CreateCompositeType - Create a composite type like array, struct, etc.
408 DICompositeType CreateCompositeType(unsigned Tag, DIDescriptor Context,
409 const std::string &Name,
410 DICompileUnit CompileUnit,
413 uint64_t AlignInBits,
414 uint64_t OffsetInBits, unsigned Flags,
417 const std::string *FileName = 0,
418 const std::string *Directory = 0);
420 /// CreateSubprogram - Create a new descriptor for the specified subprogram.
421 /// See comments in DISubprogram for descriptions of these fields.
422 DISubprogram CreateSubprogram(DIDescriptor Context, const std::string &Name,
423 const std::string &DisplayName,
424 const std::string &LinkageName,
425 DICompileUnit CompileUnit, unsigned LineNo,
426 DIType Type, bool isLocalToUnit,
428 const std::string *FileName = 0,
429 const std::string *Directory = 0);
431 /// CreateGlobalVariable - Create a new descriptor for the specified global.
433 CreateGlobalVariable(DIDescriptor Context, const std::string &Name,
434 const std::string &DisplayName,
435 const std::string &LinkageName,
436 DICompileUnit CompileUnit,
437 unsigned LineNo, DIType Type, bool isLocalToUnit,
438 bool isDefinition, llvm::GlobalVariable *GV,
439 const std::string *FileName = 0,
440 const std::string *Directory = 0);
443 /// CreateVariable - Create a new descriptor for the specified variable.
444 DIVariable CreateVariable(unsigned Tag, DIDescriptor Context,
445 const std::string &Name,
446 DICompileUnit CompileUnit, unsigned LineNo,
448 const std::string *FileName = 0,
449 const std::string *Directory = 0);
451 /// CreateBlock - This creates a descriptor for a lexical block with the
452 /// specified parent context.
453 DIBlock CreateBlock(DIDescriptor Context);
455 /// InsertStopPoint - Create a new llvm.dbg.stoppoint intrinsic invocation,
456 /// inserting it at the end of the specified basic block.
457 void InsertStopPoint(DICompileUnit CU, unsigned LineNo, unsigned ColNo,
460 /// InsertSubprogramStart - Create a new llvm.dbg.func.start intrinsic to
461 /// mark the start of the specified subprogram.
462 void InsertSubprogramStart(DISubprogram SP, BasicBlock *BB);
464 /// InsertRegionStart - Insert a new llvm.dbg.region.start intrinsic call to
465 /// mark the start of a region for the specified scoping descriptor.
466 void InsertRegionStart(DIDescriptor D, BasicBlock *BB);
468 /// InsertRegionEnd - Insert a new llvm.dbg.region.end intrinsic call to
469 /// mark the end of a region for the specified scoping descriptor.
470 void InsertRegionEnd(DIDescriptor D, BasicBlock *BB);
472 /// InsertDeclare - Insert a new llvm.dbg.declare intrinsic call.
473 void InsertDeclare(llvm::Value *Storage, DIVariable D, BasicBlock *BB);
476 Constant *GetTagConstant(unsigned TAG);
477 Constant *GetStringConstant(const std::string &String);
478 DIAnchor GetOrCreateAnchor(unsigned TAG, const char *Name);
480 /// getCastToEmpty - Return the descriptor as a Constant* with type '{}*'.
481 Constant *getCastToEmpty(DIDescriptor D);
484 /// Finds the stoppoint coressponding to this instruction, that is the
485 /// stoppoint that dominates this instruction
486 const DbgStopPointInst *findStopPoint(const Instruction *Inst);
488 /// Finds the stoppoint corresponding to first real (non-debug intrinsic)
489 /// instruction in this Basic Block, and returns the stoppoint for it.
490 const DbgStopPointInst *findBBStopPoint(const BasicBlock *BB);
492 /// Finds the dbg.declare intrinsic corresponding to this value if any.
493 /// It looks through pointer casts too.
494 const DbgDeclareInst *findDbgDeclare(const Value *V, bool stripCasts = true);
495 } // end namespace llvm