1 //===-- llvm/CodeGen/MachineModuleInfo.cpp ----------------------*- 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 #include "llvm/CodeGen/MachineModuleInfo.h"
12 #include "llvm/Constants.h"
13 #include "llvm/Analysis/ValueTracking.h"
14 #include "llvm/CodeGen/MachineFunctionPass.h"
15 #include "llvm/CodeGen/MachineFunction.h"
16 #include "llvm/CodeGen/MachineLocation.h"
17 #include "llvm/CodeGen/MachineDebugInfoDesc.h"
18 #include "llvm/Target/TargetInstrInfo.h"
19 #include "llvm/Target/TargetMachine.h"
20 #include "llvm/Target/TargetOptions.h"
21 #include "llvm/DerivedTypes.h"
22 #include "llvm/GlobalVariable.h"
23 #include "llvm/Intrinsics.h"
24 #include "llvm/Instructions.h"
25 #include "llvm/Module.h"
26 #include "llvm/Support/Dwarf.h"
27 #include "llvm/Support/Streams.h"
29 using namespace llvm::dwarf;
31 // Handle the Pass registration stuff necessary to use TargetData's.
32 static RegisterPass<MachineModuleInfo>
33 X("machinemoduleinfo", "Module Information");
34 char MachineModuleInfo::ID = 0;
36 //===----------------------------------------------------------------------===//
38 /// getGlobalVariablesUsing - Return all of the GlobalVariables which have the
39 /// specified value in their initializer somewhere.
41 getGlobalVariablesUsing(Value *V, std::vector<GlobalVariable*> &Result) {
42 // Scan though value users.
43 for (Value::use_iterator I = V->use_begin(), E = V->use_end(); I != E; ++I) {
44 if (GlobalVariable *GV = dyn_cast<GlobalVariable>(*I)) {
45 // If the user is a GlobalVariable then add to result.
47 } else if (Constant *C = dyn_cast<Constant>(*I)) {
48 // If the user is a constant variable then scan its users
49 getGlobalVariablesUsing(C, Result);
54 /// getGlobalVariablesUsing - Return all of the GlobalVariables that use the
55 /// named GlobalVariable.
57 getGlobalVariablesUsing(Module &M, const std::string &RootName,
58 std::vector<GlobalVariable*> &Result) {
59 std::vector<const Type*> FieldTypes;
60 FieldTypes.push_back(Type::Int32Ty);
61 FieldTypes.push_back(Type::Int32Ty);
63 // Get the GlobalVariable root.
64 GlobalVariable *UseRoot = M.getGlobalVariable(RootName,
65 StructType::get(FieldTypes));
67 // If present and linkonce then scan for users.
68 if (UseRoot && UseRoot->hasLinkOnceLinkage())
69 getGlobalVariablesUsing(UseRoot, Result);
72 /// isStringValue - Return true if the given value can be coerced to a string.
74 static bool isStringValue(Value *V) {
75 if (GlobalVariable *GV = dyn_cast<GlobalVariable>(V)) {
76 if (GV->hasInitializer() && isa<ConstantArray>(GV->getInitializer())) {
77 ConstantArray *Init = cast<ConstantArray>(GV->getInitializer());
78 return Init->isString();
80 } else if (Constant *C = dyn_cast<Constant>(V)) {
81 if (GlobalValue *GV = dyn_cast<GlobalValue>(C))
82 return isStringValue(GV);
83 else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
84 if (CE->getOpcode() == Instruction::GetElementPtr) {
85 if (CE->getNumOperands() == 3 &&
86 cast<Constant>(CE->getOperand(1))->isNullValue() &&
87 isa<ConstantInt>(CE->getOperand(2))) {
88 return isStringValue(CE->getOperand(0));
96 /// getGlobalVariable - Return either a direct or cast Global value.
98 static GlobalVariable *getGlobalVariable(Value *V) {
99 if (GlobalVariable *GV = dyn_cast<GlobalVariable>(V)) {
101 } else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
102 if (CE->getOpcode() == Instruction::BitCast) {
103 return dyn_cast<GlobalVariable>(CE->getOperand(0));
104 } else if (CE->getOpcode() == Instruction::GetElementPtr) {
105 for (unsigned int i=1; i<CE->getNumOperands(); i++) {
106 if (!CE->getOperand(i)->isNullValue())
109 return dyn_cast<GlobalVariable>(CE->getOperand(0));
115 /// isGlobalVariable - Return true if the given value can be coerced to a
117 static bool isGlobalVariable(Value *V) {
118 if (isa<GlobalVariable>(V) || isa<ConstantPointerNull>(V)) {
120 } else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
121 if (CE->getOpcode() == Instruction::BitCast) {
122 return isa<GlobalVariable>(CE->getOperand(0));
123 } else if (CE->getOpcode() == Instruction::GetElementPtr) {
124 for (unsigned int i=1; i<CE->getNumOperands(); i++) {
125 if (!CE->getOperand(i)->isNullValue())
128 return isa<GlobalVariable>(CE->getOperand(0));
134 //===----------------------------------------------------------------------===//
136 /// ApplyToFields - Target the visitor to each field of the debug information
138 void DIVisitor::ApplyToFields(DebugInfoDesc *DD) {
139 DD->ApplyToFields(this);
144 //===----------------------------------------------------------------------===//
145 /// DICountVisitor - This DIVisitor counts all the fields in the supplied debug
146 /// the supplied DebugInfoDesc.
147 class DICountVisitor : public DIVisitor {
149 unsigned Count; // Running count of fields.
152 DICountVisitor() : DIVisitor(), Count(0) {}
155 unsigned getCount() const { return Count; }
157 /// Apply - Count each of the fields.
159 virtual void Apply(int &Field) { ++Count; }
160 virtual void Apply(unsigned &Field) { ++Count; }
161 virtual void Apply(int64_t &Field) { ++Count; }
162 virtual void Apply(uint64_t &Field) { ++Count; }
163 virtual void Apply(bool &Field) { ++Count; }
164 virtual void Apply(std::string &Field) { ++Count; }
165 virtual void Apply(DebugInfoDesc *&Field) { ++Count; }
166 virtual void Apply(GlobalVariable *&Field) { ++Count; }
167 virtual void Apply(std::vector<DebugInfoDesc *> &Field) {
172 //===----------------------------------------------------------------------===//
173 /// DIDeserializeVisitor - This DIVisitor deserializes all the fields in the
174 /// supplied DebugInfoDesc.
175 class DIDeserializeVisitor : public DIVisitor {
177 DIDeserializer &DR; // Active deserializer.
178 unsigned I; // Current operand index.
179 ConstantStruct *CI; // GlobalVariable constant initializer.
182 DIDeserializeVisitor(DIDeserializer &D, GlobalVariable *GV)
183 : DIVisitor(), DR(D), I(0), CI(cast<ConstantStruct>(GV->getInitializer()))
186 /// Apply - Set the value of each of the fields.
188 virtual void Apply(int &Field) {
189 Constant *C = CI->getOperand(I++);
190 Field = cast<ConstantInt>(C)->getSExtValue();
192 virtual void Apply(unsigned &Field) {
193 Constant *C = CI->getOperand(I++);
194 Field = cast<ConstantInt>(C)->getZExtValue();
196 virtual void Apply(int64_t &Field) {
197 Constant *C = CI->getOperand(I++);
198 Field = cast<ConstantInt>(C)->getSExtValue();
200 virtual void Apply(uint64_t &Field) {
201 Constant *C = CI->getOperand(I++);
202 Field = cast<ConstantInt>(C)->getZExtValue();
204 virtual void Apply(bool &Field) {
205 Constant *C = CI->getOperand(I++);
206 Field = cast<ConstantInt>(C)->getZExtValue();
208 virtual void Apply(std::string &Field) {
209 Constant *C = CI->getOperand(I++);
210 // Fills in the string if it succeeds
211 if (!GetConstantStringInfo(C, Field))
214 virtual void Apply(DebugInfoDesc *&Field) {
215 Constant *C = CI->getOperand(I++);
216 Field = DR.Deserialize(C);
218 virtual void Apply(GlobalVariable *&Field) {
219 Constant *C = CI->getOperand(I++);
220 Field = getGlobalVariable(C);
222 virtual void Apply(std::vector<DebugInfoDesc *> &Field) {
224 Constant *C = CI->getOperand(I++);
225 GlobalVariable *GV = getGlobalVariable(C);
226 if (GV->hasInitializer()) {
227 if (ConstantArray *CA = dyn_cast<ConstantArray>(GV->getInitializer())) {
228 for (unsigned i = 0, N = CA->getNumOperands(); i < N; ++i) {
229 GlobalVariable *GVE = getGlobalVariable(CA->getOperand(i));
230 DebugInfoDesc *DE = DR.Deserialize(GVE);
233 } else if (GV->getInitializer()->isNullValue()) {
234 if (const ArrayType *T =
235 dyn_cast<ArrayType>(GV->getType()->getElementType())) {
236 Field.resize(T->getNumElements());
243 //===----------------------------------------------------------------------===//
244 /// DISerializeVisitor - This DIVisitor serializes all the fields in
245 /// the supplied DebugInfoDesc.
246 class DISerializeVisitor : public DIVisitor {
248 DISerializer &SR; // Active serializer.
249 std::vector<Constant*> &Elements; // Element accumulator.
252 DISerializeVisitor(DISerializer &S, std::vector<Constant*> &E)
253 : DIVisitor(), SR(S), Elements(E) {}
255 /// Apply - Set the value of each of the fields.
257 virtual void Apply(int &Field) {
258 Elements.push_back(ConstantInt::get(Type::Int32Ty, int32_t(Field)));
260 virtual void Apply(unsigned &Field) {
261 Elements.push_back(ConstantInt::get(Type::Int32Ty, uint32_t(Field)));
263 virtual void Apply(int64_t &Field) {
264 Elements.push_back(ConstantInt::get(Type::Int64Ty, int64_t(Field)));
266 virtual void Apply(uint64_t &Field) {
267 Elements.push_back(ConstantInt::get(Type::Int64Ty, uint64_t(Field)));
269 virtual void Apply(bool &Field) {
270 Elements.push_back(ConstantInt::get(Type::Int1Ty, Field));
272 virtual void Apply(std::string &Field) {
273 Elements.push_back(SR.getString(Field));
275 virtual void Apply(DebugInfoDesc *&Field) {
276 GlobalVariable *GV = NULL;
278 // If non-NULL then convert to global.
279 if (Field) GV = SR.Serialize(Field);
281 // FIXME - At some point should use specific type.
282 const PointerType *EmptyTy = SR.getEmptyStructPtrType();
285 // Set to pointer to global.
286 Elements.push_back(ConstantExpr::getBitCast(GV, EmptyTy));
289 Elements.push_back(ConstantPointerNull::get(EmptyTy));
292 virtual void Apply(GlobalVariable *&Field) {
293 const PointerType *EmptyTy = SR.getEmptyStructPtrType();
295 Elements.push_back(ConstantExpr::getBitCast(Field, EmptyTy));
297 Elements.push_back(ConstantPointerNull::get(EmptyTy));
300 virtual void Apply(std::vector<DebugInfoDesc *> &Field) {
301 const PointerType *EmptyTy = SR.getEmptyStructPtrType();
302 unsigned N = Field.size();
303 ArrayType *AT = ArrayType::get(EmptyTy, N);
304 std::vector<Constant *> ArrayElements;
306 for (unsigned i = 0; i < N; ++i) {
307 if (DebugInfoDesc *Element = Field[i]) {
308 GlobalVariable *GVE = SR.Serialize(Element);
309 Constant *CE = ConstantExpr::getBitCast(GVE, EmptyTy);
310 ArrayElements.push_back(cast<Constant>(CE));
312 ArrayElements.push_back(ConstantPointerNull::get(EmptyTy));
316 Constant *CA = ConstantArray::get(AT, ArrayElements);
317 GlobalVariable *CAGV = new GlobalVariable(AT, true,
318 GlobalValue::InternalLinkage,
319 CA, "llvm.dbg.array",
321 CAGV->setSection("llvm.metadata");
322 Constant *CAE = ConstantExpr::getBitCast(CAGV, EmptyTy);
323 Elements.push_back(CAE);
327 //===----------------------------------------------------------------------===//
328 /// DIGetTypesVisitor - This DIVisitor gathers all the field types in
329 /// the supplied DebugInfoDesc.
330 class DIGetTypesVisitor : public DIVisitor {
332 DISerializer &SR; // Active serializer.
333 std::vector<const Type*> &Fields; // Type accumulator.
336 DIGetTypesVisitor(DISerializer &S, std::vector<const Type*> &F)
337 : DIVisitor(), SR(S), Fields(F) {}
339 /// Apply - Set the value of each of the fields.
341 virtual void Apply(int &Field) {
342 Fields.push_back(Type::Int32Ty);
344 virtual void Apply(unsigned &Field) {
345 Fields.push_back(Type::Int32Ty);
347 virtual void Apply(int64_t &Field) {
348 Fields.push_back(Type::Int64Ty);
350 virtual void Apply(uint64_t &Field) {
351 Fields.push_back(Type::Int64Ty);
353 virtual void Apply(bool &Field) {
354 Fields.push_back(Type::Int1Ty);
356 virtual void Apply(std::string &Field) {
357 Fields.push_back(SR.getStrPtrType());
359 virtual void Apply(DebugInfoDesc *&Field) {
360 // FIXME - At some point should use specific type.
361 const PointerType *EmptyTy = SR.getEmptyStructPtrType();
362 Fields.push_back(EmptyTy);
364 virtual void Apply(GlobalVariable *&Field) {
365 const PointerType *EmptyTy = SR.getEmptyStructPtrType();
366 Fields.push_back(EmptyTy);
368 virtual void Apply(std::vector<DebugInfoDesc *> &Field) {
369 const PointerType *EmptyTy = SR.getEmptyStructPtrType();
370 Fields.push_back(EmptyTy);
374 //===----------------------------------------------------------------------===//
375 /// DIVerifyVisitor - This DIVisitor verifies all the field types against
376 /// a constant initializer.
377 class DIVerifyVisitor : public DIVisitor {
379 DIVerifier &VR; // Active verifier.
380 bool IsValid; // Validity status.
381 unsigned I; // Current operand index.
382 ConstantStruct *CI; // GlobalVariable constant initializer.
385 DIVerifyVisitor(DIVerifier &V, GlobalVariable *GV)
390 , CI(cast<ConstantStruct>(GV->getInitializer()))
395 bool isValid() const { return IsValid; }
397 /// Apply - Set the value of each of the fields.
399 virtual void Apply(int &Field) {
400 Constant *C = CI->getOperand(I++);
401 IsValid = IsValid && isa<ConstantInt>(C);
403 virtual void Apply(unsigned &Field) {
404 Constant *C = CI->getOperand(I++);
405 IsValid = IsValid && isa<ConstantInt>(C);
407 virtual void Apply(int64_t &Field) {
408 Constant *C = CI->getOperand(I++);
409 IsValid = IsValid && isa<ConstantInt>(C);
411 virtual void Apply(uint64_t &Field) {
412 Constant *C = CI->getOperand(I++);
413 IsValid = IsValid && isa<ConstantInt>(C);
415 virtual void Apply(bool &Field) {
416 Constant *C = CI->getOperand(I++);
417 IsValid = IsValid && isa<ConstantInt>(C) && C->getType() == Type::Int1Ty;
419 virtual void Apply(std::string &Field) {
420 Constant *C = CI->getOperand(I++);
422 (!C || isStringValue(C) || C->isNullValue());
424 virtual void Apply(DebugInfoDesc *&Field) {
425 // FIXME - Prepare the correct descriptor.
426 Constant *C = CI->getOperand(I++);
427 IsValid = IsValid && isGlobalVariable(C);
429 virtual void Apply(GlobalVariable *&Field) {
430 Constant *C = CI->getOperand(I++);
431 IsValid = IsValid && isGlobalVariable(C);
433 virtual void Apply(std::vector<DebugInfoDesc *> &Field) {
434 Constant *C = CI->getOperand(I++);
435 IsValid = IsValid && isGlobalVariable(C);
436 if (!IsValid) return;
438 GlobalVariable *GV = getGlobalVariable(C);
439 IsValid = IsValid && GV && GV->hasInitializer();
440 if (!IsValid) return;
442 ConstantArray *CA = dyn_cast<ConstantArray>(GV->getInitializer());
443 IsValid = IsValid && CA;
444 if (!IsValid) return;
446 for (unsigned i = 0, N = CA->getNumOperands(); IsValid && i < N; ++i) {
447 IsValid = IsValid && isGlobalVariable(CA->getOperand(i));
448 if (!IsValid) return;
450 GlobalVariable *GVE = getGlobalVariable(CA->getOperand(i));
458 //===----------------------------------------------------------------------===//
460 DebugInfoDesc *DIDeserializer::Deserialize(Value *V) {
461 return Deserialize(getGlobalVariable(V));
463 DebugInfoDesc *DIDeserializer::Deserialize(GlobalVariable *GV) {
465 if (!GV) return NULL;
467 // Check to see if it has been already deserialized.
468 DebugInfoDesc *&Slot = GlobalDescs[GV];
469 if (Slot) return Slot;
471 // Get the Tag from the global.
472 unsigned Tag = DebugInfoDesc::TagFromGlobal(GV);
474 // Create an empty instance of the correct sort.
475 Slot = DebugInfoDesc::DescFactory(Tag);
477 // If not a user defined descriptor.
479 // Deserialize the fields.
480 DIDeserializeVisitor DRAM(*this, GV);
481 DRAM.ApplyToFields(Slot);
487 //===----------------------------------------------------------------------===//
489 /// getStrPtrType - Return a "sbyte *" type.
491 const PointerType *DISerializer::getStrPtrType() {
492 // If not already defined.
494 // Construct the pointer to signed bytes.
495 StrPtrTy = PointerType::getUnqual(Type::Int8Ty);
501 /// getEmptyStructPtrType - Return a "{ }*" type.
503 const PointerType *DISerializer::getEmptyStructPtrType() {
504 // If not already defined.
505 if (EmptyStructPtrTy) return EmptyStructPtrTy;
507 // Construct the pointer to empty structure type.
508 const StructType *EmptyStructTy = StructType::get(NULL, NULL);
510 // Construct the pointer to empty structure type.
511 EmptyStructPtrTy = PointerType::getUnqual(EmptyStructTy);
512 return EmptyStructPtrTy;
515 /// getTagType - Return the type describing the specified descriptor (via tag.)
517 const StructType *DISerializer::getTagType(DebugInfoDesc *DD) {
518 // Attempt to get the previously defined type.
519 StructType *&Ty = TagTypes[DD->getTag()];
521 // If not already defined.
523 // Set up fields vector.
524 std::vector<const Type*> Fields;
526 // Get types of fields.
527 DIGetTypesVisitor GTAM(*this, Fields);
528 GTAM.ApplyToFields(DD);
530 // Construct structured type.
531 Ty = StructType::get(Fields);
533 // Register type name with module.
534 M->addTypeName(DD->getTypeString(), Ty);
540 /// getString - Construct the string as constant string global.
542 Constant *DISerializer::getString(const std::string &String) {
543 // Check string cache for previous edition.
544 Constant *&Slot = StringCache[String.c_str()];
546 // Return Constant if previously defined.
547 if (Slot) return Slot;
549 // If empty string then use a sbyte* null instead.
550 if (String.empty()) {
551 Slot = ConstantPointerNull::get(getStrPtrType());
553 // Construct string as an llvm constant.
554 Constant *ConstStr = ConstantArray::get(String);
556 // Otherwise create and return a new string global.
557 GlobalVariable *StrGV = new GlobalVariable(ConstStr->getType(), true,
558 GlobalVariable::InternalLinkage,
559 ConstStr, ".str", M);
560 StrGV->setSection("llvm.metadata");
562 // Convert to generic string pointer.
563 Slot = ConstantExpr::getBitCast(StrGV, getStrPtrType());
570 /// Serialize - Recursively cast the specified descriptor into a GlobalVariable
571 /// so that it can be serialized to a .bc or .ll file.
572 GlobalVariable *DISerializer::Serialize(DebugInfoDesc *DD) {
573 // Check if the DebugInfoDesc is already in the map.
574 GlobalVariable *&Slot = DescGlobals[DD];
576 // See if DebugInfoDesc exists, if so return prior GlobalVariable.
577 if (Slot) return Slot;
579 // Get the type associated with the Tag.
580 const StructType *Ty = getTagType(DD);
582 // Create the GlobalVariable early to prevent infinite recursion.
584 new GlobalVariable(Ty, true, DD->getLinkage(),
585 NULL, DD->getDescString(), M);
586 GV->setSection("llvm.metadata");
588 // Insert new GlobalVariable in DescGlobals map.
591 // Set up elements vector
592 std::vector<Constant*> Elements;
595 DISerializeVisitor SRAM(*this, Elements);
596 SRAM.ApplyToFields(DD);
598 // Set the globals initializer.
599 GV->setInitializer(ConstantStruct::get(Ty, Elements));
604 /// addDescriptor - Directly connect DD with existing GV.
605 void DISerializer::addDescriptor(DebugInfoDesc *DD,
606 GlobalVariable *GV) {
607 DescGlobals[DD] = GV;
610 //===----------------------------------------------------------------------===//
612 /// Verify - Return true if the GlobalVariable appears to be a valid
613 /// serialization of a DebugInfoDesc.
614 bool DIVerifier::Verify(Value *V) {
615 return !V || Verify(getGlobalVariable(V));
617 bool DIVerifier::Verify(GlobalVariable *GV) {
619 if (!GV) return true;
621 // Check prior validity.
622 unsigned &ValiditySlot = Validity[GV];
624 // If visited before then use old state.
625 if (ValiditySlot) return ValiditySlot == Valid;
627 // Assume validity for the time being (recursion.)
628 ValiditySlot = Valid;
630 // Make sure the global is internal or link once (anchor.)
631 if (GV->getLinkage() != GlobalValue::InternalLinkage &&
632 GV->getLinkage() != GlobalValue::LinkOnceLinkage) {
633 ValiditySlot = Invalid;
638 unsigned Tag = DebugInfoDesc::TagFromGlobal(GV);
640 // Check for user defined descriptors.
641 if (Tag == DW_TAG_invalid) {
642 ValiditySlot = Valid;
647 unsigned Version = DebugInfoDesc::VersionFromGlobal(GV);
649 // Check for version mismatch.
650 if (Version != LLVMDebugVersion) {
651 ValiditySlot = Invalid;
655 // Construct an empty DebugInfoDesc.
656 DebugInfoDesc *DD = DebugInfoDesc::DescFactory(Tag);
658 // Allow for user defined descriptors.
659 if (!DD) return true;
661 // Get the initializer constant.
662 ConstantStruct *CI = cast<ConstantStruct>(GV->getInitializer());
664 // Get the operand count.
665 unsigned N = CI->getNumOperands();
667 // Get the field count.
668 unsigned &CountSlot = Counts[Tag];
670 // Check the operand count to the field count
672 CTAM.ApplyToFields(DD);
673 CountSlot = CTAM.getCount();
676 // Field count must be at most equal operand count.
679 ValiditySlot = Invalid;
683 // Check each field for valid type.
684 DIVerifyVisitor VRAM(*this, GV);
685 VRAM.ApplyToFields(DD);
687 // Release empty DebugInfoDesc.
690 // If fields are not valid.
691 if (!VRAM.isValid()) {
692 ValiditySlot = Invalid;
699 /// isVerified - Return true if the specified GV has already been
700 /// verified as a debug information descriptor.
701 bool DIVerifier::isVerified(GlobalVariable *GV) {
702 unsigned &ValiditySlot = Validity[GV];
703 if (ValiditySlot) return ValiditySlot == Valid;
707 //===----------------------------------------------------------------------===//
709 DebugScope::~DebugScope() {
710 for (unsigned i = 0, e = Scopes.size(); i < e; ++i) delete Scopes[i];
711 for (unsigned i = 0, e = Variables.size(); i < e; ++i) delete Variables[i];
714 //===----------------------------------------------------------------------===//
716 MachineModuleInfo::MachineModuleInfo()
717 : ImmutablePass((intptr_t)&ID)
733 // Always emit "no personality" info
734 Personalities.push_back(NULL);
736 MachineModuleInfo::~MachineModuleInfo() {
740 /// doInitialization - Initialize the state for a new module.
742 bool MachineModuleInfo::doInitialization() {
746 /// doFinalization - Tear down the state after completion of a module.
748 bool MachineModuleInfo::doFinalization() {
752 /// BeginFunction - Begin gathering function meta information.
754 void MachineModuleInfo::BeginFunction(MachineFunction *MF) {
758 /// EndFunction - Discard function meta information.
760 void MachineModuleInfo::EndFunction() {
761 // Clean up scope information.
768 // Clean up line info.
771 // Clean up frame info.
774 // Clean up exception info.
783 /// getDescFor - Convert a Value to a debug information descriptor.
785 // FIXME - use new Value type when available.
786 DebugInfoDesc *MachineModuleInfo::getDescFor(Value *V) {
787 return DR.Deserialize(V);
790 /// AnalyzeModule - Scan the module for global debug information.
792 void MachineModuleInfo::AnalyzeModule(Module &M) {
793 SetupCompileUnits(M);
795 // Insert functions in the llvm.used array into UsedFunctions.
796 GlobalVariable *GV = M.getGlobalVariable("llvm.used");
797 if (!GV || !GV->hasInitializer()) return;
799 // Should be an array of 'i8*'.
800 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
801 if (InitList == 0) return;
803 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
804 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(InitList->getOperand(i)))
805 if (CE->getOpcode() == Instruction::BitCast)
806 if (Function *F = dyn_cast<Function>(CE->getOperand(0)))
807 UsedFunctions.insert(F);
811 /// SetupCompileUnits - Set up the unique vector of compile units.
813 void MachineModuleInfo::SetupCompileUnits(Module &M) {
814 std::vector<void*> CUList;
816 getAnchoredDescriptors(M, &CUD, CUList);
818 for (unsigned i = 0, e = CUList.size(); i < e; i++)
819 CompileUnits.insert((CompileUnitDesc*)CUList[i]);
822 /// getCompileUnits - Return a vector of debug compile units.
824 const UniqueVector<CompileUnitDesc *> MachineModuleInfo::getCompileUnits()const{
828 /// getAnchoredDescriptors - Return a vector of anchored debug descriptors.
831 MachineModuleInfo::getAnchoredDescriptors(Module &M, const AnchoredDesc *Desc,
832 std::vector<void*> &AnchoredDescs) {
833 std::vector<GlobalVariable*> Globals;
834 getGlobalVariablesUsing(M, Desc->getAnchorString(), Globals);
836 for (unsigned i = 0, e = Globals.size(); i < e; ++i) {
837 GlobalVariable *GV = Globals[i];
839 // FIXME - In the short term, changes are too drastic to continue.
840 if (DebugInfoDesc::TagFromGlobal(GV) == Desc->getTag() &&
841 DebugInfoDesc::VersionFromGlobal(GV) == LLVMDebugVersion)
842 AnchoredDescs.push_back(DR.Deserialize(GV));
846 /// getGlobalVariablesUsing - Return all of the GlobalVariables that use the
847 /// named GlobalVariable.
849 MachineModuleInfo::getGlobalVariablesUsing(Module &M,
850 const std::string &RootName,
851 std::vector<GlobalVariable*> &Globals) {
852 return ::getGlobalVariablesUsing(M, RootName, Globals);
855 /// RecordSourceLine - Records location information and associates it with a
856 /// debug label. Returns a unique label ID used to generate a label and
857 /// provide correspondence to the source line list.
858 unsigned MachineModuleInfo::RecordSourceLine(unsigned Line, unsigned Column,
860 unsigned ID = NextLabelID();
861 Lines.push_back(SourceLineInfo(Line, Column, Source, ID));
865 /// RecordSource - Register a source file with debug info. Returns an source
867 unsigned MachineModuleInfo::RecordSource(const std::string &Directory,
868 const std::string &Source) {
869 unsigned DirectoryID = Directories.insert(Directory);
870 return SourceFiles.insert(SourceFileInfo(DirectoryID, Source));
872 unsigned MachineModuleInfo::RecordSource(const CompileUnitDesc *CompileUnit) {
873 return RecordSource(CompileUnit->getDirectory(),
874 CompileUnit->getFileName());
877 /// RecordRegionStart - Indicate the start of a region.
879 unsigned MachineModuleInfo::RecordRegionStart(Value *V) {
880 // FIXME - need to be able to handle split scopes because of bb cloning.
881 DebugInfoDesc *ScopeDesc = DR.Deserialize(V);
882 DebugScope *Scope = getOrCreateScope(ScopeDesc);
883 unsigned ID = NextLabelID();
884 if (!Scope->getStartLabelID()) Scope->setStartLabelID(ID);
888 /// RecordRegionEnd - Indicate the end of a region.
890 unsigned MachineModuleInfo::RecordRegionEnd(Value *V) {
891 // FIXME - need to be able to handle split scopes because of bb cloning.
892 DebugInfoDesc *ScopeDesc = DR.Deserialize(V);
893 DebugScope *Scope = getOrCreateScope(ScopeDesc);
894 unsigned ID = NextLabelID();
895 Scope->setEndLabelID(ID);
899 /// RecordVariable - Indicate the declaration of a local variable.
901 void MachineModuleInfo::RecordVariable(GlobalValue *GV, unsigned FrameIndex) {
902 VariableDesc *VD = cast<VariableDesc>(DR.Deserialize(GV));
903 DebugScope *Scope = getOrCreateScope(VD->getContext());
904 DebugVariable *DV = new DebugVariable(VD, FrameIndex);
905 Scope->AddVariable(DV);
908 /// getOrCreateScope - Returns the scope associated with the given descriptor.
910 DebugScope *MachineModuleInfo::getOrCreateScope(DebugInfoDesc *ScopeDesc) {
911 DebugScope *&Slot = ScopeMap[ScopeDesc];
913 // FIXME - breaks down when the context is an inlined function.
914 DebugInfoDesc *ParentDesc = NULL;
915 if (BlockDesc *Block = dyn_cast<BlockDesc>(ScopeDesc)) {
916 ParentDesc = Block->getContext();
918 DebugScope *Parent = ParentDesc ? getOrCreateScope(ParentDesc) : NULL;
919 Slot = new DebugScope(Parent, ScopeDesc);
921 Parent->AddScope(Slot);
922 } else if (RootScope) {
923 // FIXME - Add inlined function scopes to the root so we can delete
924 // them later. Long term, handle inlined functions properly.
925 RootScope->AddScope(Slot);
927 // First function is top level function.
934 //===-EH-------------------------------------------------------------------===//
936 /// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the
937 /// specified MachineBasicBlock.
939 MachineModuleInfo::getOrCreateLandingPadInfo(MachineBasicBlock *LandingPad) {
940 unsigned N = LandingPads.size();
942 for (unsigned i = 0; i < N; ++i) {
943 LandingPadInfo &LP = LandingPads[i];
944 if (LP.LandingPadBlock == LandingPad)
948 LandingPads.push_back(LandingPadInfo(LandingPad));
949 return LandingPads[N];
952 /// addInvoke - Provide the begin and end labels of an invoke style call and
953 /// associate it with a try landing pad block.
954 void MachineModuleInfo::addInvoke(MachineBasicBlock *LandingPad,
955 unsigned BeginLabel, unsigned EndLabel) {
956 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
957 LP.BeginLabels.push_back(BeginLabel);
958 LP.EndLabels.push_back(EndLabel);
961 /// addLandingPad - Provide the label of a try LandingPad block.
963 unsigned MachineModuleInfo::addLandingPad(MachineBasicBlock *LandingPad) {
964 unsigned LandingPadLabel = NextLabelID();
965 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
966 LP.LandingPadLabel = LandingPadLabel;
967 return LandingPadLabel;
970 /// addPersonality - Provide the personality function for the exception
972 void MachineModuleInfo::addPersonality(MachineBasicBlock *LandingPad,
973 Function *Personality) {
974 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
975 LP.Personality = Personality;
977 for (unsigned i = 0, e = Personalities.size(); i < e; ++i)
978 if (Personalities[i] == Personality)
981 Personalities.push_back(Personality);
984 /// addCatchTypeInfo - Provide the catch typeinfo for a landing pad.
986 void MachineModuleInfo::addCatchTypeInfo(MachineBasicBlock *LandingPad,
987 std::vector<GlobalVariable *> &TyInfo) {
988 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
989 for (unsigned N = TyInfo.size(); N; --N)
990 LP.TypeIds.push_back(getTypeIDFor(TyInfo[N - 1]));
993 /// addFilterTypeInfo - Provide the filter typeinfo for a landing pad.
995 void MachineModuleInfo::addFilterTypeInfo(MachineBasicBlock *LandingPad,
996 std::vector<GlobalVariable *> &TyInfo) {
997 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
998 unsigned TyInfoSize = TyInfo.size();
999 std::vector<unsigned> IdsInFilter(TyInfoSize);
1001 for (unsigned I = 0; I != TyInfoSize; ++I)
1002 IdsInFilter[I] = getTypeIDFor(TyInfo[I]);
1004 LP.TypeIds.push_back(getFilterIDFor(IdsInFilter));
1007 /// addCleanup - Add a cleanup action for a landing pad.
1009 void MachineModuleInfo::addCleanup(MachineBasicBlock *LandingPad) {
1010 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
1011 LP.TypeIds.push_back(0);
1014 /// TidyLandingPads - Remap landing pad labels and remove any deleted landing
1016 void MachineModuleInfo::TidyLandingPads() {
1017 for (unsigned i = 0; i != LandingPads.size(); ) {
1018 LandingPadInfo &LandingPad = LandingPads[i];
1019 LandingPad.LandingPadLabel = MappedLabel(LandingPad.LandingPadLabel);
1021 // Special case: we *should* emit LPs with null LP MBB. This indicates
1023 if (!LandingPad.LandingPadLabel && LandingPad.LandingPadBlock) {
1024 LandingPads.erase(LandingPads.begin() + i);
1028 for (unsigned j = 0; j != LandingPads[i].BeginLabels.size(); ) {
1029 unsigned BeginLabel = MappedLabel(LandingPad.BeginLabels[j]);
1030 unsigned EndLabel = MappedLabel(LandingPad.EndLabels[j]);
1032 if (!BeginLabel || !EndLabel) {
1033 LandingPad.BeginLabels.erase(LandingPad.BeginLabels.begin() + j);
1034 LandingPad.EndLabels.erase(LandingPad.EndLabels.begin() + j);
1038 LandingPad.BeginLabels[j] = BeginLabel;
1039 LandingPad.EndLabels[j] = EndLabel;
1043 // Remove landing pads with no try-ranges.
1044 if (LandingPads[i].BeginLabels.empty()) {
1045 LandingPads.erase(LandingPads.begin() + i);
1049 // If there is no landing pad, ensure that the list of typeids is empty.
1050 // If the only typeid is a cleanup, this is the same as having no typeids.
1051 if (!LandingPad.LandingPadBlock ||
1052 (LandingPad.TypeIds.size() == 1 && !LandingPad.TypeIds[0]))
1053 LandingPad.TypeIds.clear();
1059 /// getTypeIDFor - Return the type id for the specified typeinfo. This is
1061 unsigned MachineModuleInfo::getTypeIDFor(GlobalVariable *TI) {
1062 for (unsigned i = 0, e = TypeInfos.size(); i != e; ++i)
1063 if (TypeInfos[i] == TI)
1066 TypeInfos.push_back(TI);
1067 return TypeInfos.size();
1070 /// getFilterIDFor - Return the filter id for the specified typeinfos. This is
1072 int MachineModuleInfo::getFilterIDFor(std::vector<unsigned> &TyIds) {
1073 // If the new filter coincides with the tail of an existing filter, then
1074 // re-use the existing filter. Folding filters more than this requires
1075 // re-ordering filters and/or their elements - probably not worth it.
1076 for (std::vector<unsigned>::iterator I = FilterEnds.begin(),
1077 E = FilterEnds.end(); I != E; ++I) {
1078 unsigned i = *I, j = TyIds.size();
1081 if (FilterIds[--i] != TyIds[--j])
1085 // The new filter coincides with range [i, end) of the existing filter.
1091 // Add the new filter.
1092 int FilterID = -(1 + FilterIds.size());
1093 FilterIds.reserve(FilterIds.size() + TyIds.size() + 1);
1095 for (unsigned I = 0, N = TyIds.size(); I != N; ++I)
1096 FilterIds.push_back(TyIds[I]);
1098 FilterEnds.push_back(FilterIds.size());
1099 FilterIds.push_back(0); // terminator
1103 /// getPersonality - Return the personality function for the current function.
1104 Function *MachineModuleInfo::getPersonality() const {
1105 // FIXME: Until PR1414 will be fixed, we're using 1 personality function per
1107 return !LandingPads.empty() ? LandingPads[0].Personality : NULL;
1110 /// getPersonalityIndex - Return unique index for current personality
1111 /// function. NULL personality function should always get zero index.
1112 unsigned MachineModuleInfo::getPersonalityIndex() const {
1113 const Function* Personality = NULL;
1115 // Scan landing pads. If there is at least one non-NULL personality - use it.
1116 for (unsigned i = 0, e = LandingPads.size(); i != e; ++i)
1117 if (LandingPads[i].Personality) {
1118 Personality = LandingPads[i].Personality;
1122 for (unsigned i = 0, e = Personalities.size(); i < e; ++i)
1123 if (Personalities[i] == Personality)
1126 // This should never happen
1127 assert(0 && "Personality function should be set!");
1131 //===----------------------------------------------------------------------===//
1132 /// DebugLabelFolding pass - This pass prunes out redundant labels. This allows
1133 /// a info consumer to determine if the range of two labels is empty, by seeing
1134 /// if the labels map to the same reduced label.
1138 struct DebugLabelFolder : public MachineFunctionPass {
1140 DebugLabelFolder() : MachineFunctionPass((intptr_t)&ID) {}
1142 virtual bool runOnMachineFunction(MachineFunction &MF);
1143 virtual const char *getPassName() const { return "Label Folder"; }
1146 char DebugLabelFolder::ID = 0;
1148 bool DebugLabelFolder::runOnMachineFunction(MachineFunction &MF) {
1149 // Get machine module info.
1150 MachineModuleInfo *MMI = getAnalysisToUpdate<MachineModuleInfo>();
1151 if (!MMI) return false;
1153 // Track if change is made.
1154 bool MadeChange = false;
1155 // No prior label to begin.
1156 unsigned PriorLabel = 0;
1158 // Iterate through basic blocks.
1159 for (MachineFunction::iterator BB = MF.begin(), E = MF.end();
1161 // Iterate through instructions.
1162 for (MachineBasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ) {
1164 if (I->isDebugLabel()) {
1165 // The label ID # is always operand #0, an immediate.
1166 unsigned NextLabel = I->getOperand(0).getImm();
1168 // If there was an immediate prior label.
1170 // Remap the current label to prior label.
1171 MMI->RemapLabel(NextLabel, PriorLabel);
1172 // Delete the current label.
1174 // Indicate a change has been made.
1178 // Start a new round.
1179 PriorLabel = NextLabel;
1182 // No consecutive labels.
1193 FunctionPass *createDebugLabelFoldingPass() { return new DebugLabelFolder(); }