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)
186 , CI(cast<ConstantStruct>(GV->getInitializer()))
189 /// Apply - Set the value of each of the fields.
191 virtual void Apply(int &Field) {
192 Constant *C = CI->getOperand(I++);
193 Field = cast<ConstantInt>(C)->getSExtValue();
195 virtual void Apply(unsigned &Field) {
196 Constant *C = CI->getOperand(I++);
197 Field = cast<ConstantInt>(C)->getZExtValue();
199 virtual void Apply(int64_t &Field) {
200 Constant *C = CI->getOperand(I++);
201 Field = cast<ConstantInt>(C)->getSExtValue();
203 virtual void Apply(uint64_t &Field) {
204 Constant *C = CI->getOperand(I++);
205 Field = cast<ConstantInt>(C)->getZExtValue();
207 virtual void Apply(bool &Field) {
208 Constant *C = CI->getOperand(I++);
209 Field = cast<ConstantInt>(C)->getZExtValue();
211 virtual void Apply(std::string &Field) {
212 Constant *C = CI->getOperand(I++);
213 // Fills in the string if it succeeds
214 if (!GetConstantStringInfo(C, Field))
217 virtual void Apply(DebugInfoDesc *&Field) {
218 Constant *C = CI->getOperand(I++);
219 Field = DR.Deserialize(C);
221 virtual void Apply(GlobalVariable *&Field) {
222 Constant *C = CI->getOperand(I++);
223 Field = getGlobalVariable(C);
225 virtual void Apply(std::vector<DebugInfoDesc *> &Field) {
227 Constant *C = CI->getOperand(I++);
228 GlobalVariable *GV = getGlobalVariable(C);
229 if (GV->hasInitializer()) {
230 if (ConstantArray *CA = dyn_cast<ConstantArray>(GV->getInitializer())) {
231 for (unsigned i = 0, N = CA->getNumOperands(); i < N; ++i) {
232 GlobalVariable *GVE = getGlobalVariable(CA->getOperand(i));
233 DebugInfoDesc *DE = DR.Deserialize(GVE);
236 } else if (GV->getInitializer()->isNullValue()) {
237 if (const ArrayType *T =
238 dyn_cast<ArrayType>(GV->getType()->getElementType())) {
239 Field.resize(T->getNumElements());
246 //===----------------------------------------------------------------------===//
247 /// DISerializeVisitor - This DIVisitor serializes all the fields in
248 /// the supplied DebugInfoDesc.
249 class DISerializeVisitor : public DIVisitor {
251 DISerializer &SR; // Active serializer.
252 std::vector<Constant*> &Elements; // Element accumulator.
255 DISerializeVisitor(DISerializer &S, std::vector<Constant*> &E)
261 /// Apply - Set the value of each of the fields.
263 virtual void Apply(int &Field) {
264 Elements.push_back(ConstantInt::get(Type::Int32Ty, int32_t(Field)));
266 virtual void Apply(unsigned &Field) {
267 Elements.push_back(ConstantInt::get(Type::Int32Ty, uint32_t(Field)));
269 virtual void Apply(int64_t &Field) {
270 Elements.push_back(ConstantInt::get(Type::Int64Ty, int64_t(Field)));
272 virtual void Apply(uint64_t &Field) {
273 Elements.push_back(ConstantInt::get(Type::Int64Ty, uint64_t(Field)));
275 virtual void Apply(bool &Field) {
276 Elements.push_back(ConstantInt::get(Type::Int1Ty, Field));
278 virtual void Apply(std::string &Field) {
279 Elements.push_back(SR.getString(Field));
281 virtual void Apply(DebugInfoDesc *&Field) {
282 GlobalVariable *GV = NULL;
284 // If non-NULL then convert to global.
285 if (Field) GV = SR.Serialize(Field);
287 // FIXME - At some point should use specific type.
288 const PointerType *EmptyTy = SR.getEmptyStructPtrType();
291 // Set to pointer to global.
292 Elements.push_back(ConstantExpr::getBitCast(GV, EmptyTy));
295 Elements.push_back(ConstantPointerNull::get(EmptyTy));
298 virtual void Apply(GlobalVariable *&Field) {
299 const PointerType *EmptyTy = SR.getEmptyStructPtrType();
301 Elements.push_back(ConstantExpr::getBitCast(Field, EmptyTy));
303 Elements.push_back(ConstantPointerNull::get(EmptyTy));
306 virtual void Apply(std::vector<DebugInfoDesc *> &Field) {
307 const PointerType *EmptyTy = SR.getEmptyStructPtrType();
308 unsigned N = Field.size();
309 ArrayType *AT = ArrayType::get(EmptyTy, N);
310 std::vector<Constant *> ArrayElements;
312 for (unsigned i = 0, N = Field.size(); i < N; ++i) {
313 if (DebugInfoDesc *Element = Field[i]) {
314 GlobalVariable *GVE = SR.Serialize(Element);
315 Constant *CE = ConstantExpr::getBitCast(GVE, EmptyTy);
316 ArrayElements.push_back(cast<Constant>(CE));
318 ArrayElements.push_back(ConstantPointerNull::get(EmptyTy));
322 Constant *CA = ConstantArray::get(AT, ArrayElements);
323 GlobalVariable *CAGV = new GlobalVariable(AT, true,
324 GlobalValue::InternalLinkage,
325 CA, "llvm.dbg.array",
327 CAGV->setSection("llvm.metadata");
328 Constant *CAE = ConstantExpr::getBitCast(CAGV, EmptyTy);
329 Elements.push_back(CAE);
333 //===----------------------------------------------------------------------===//
334 /// DIGetTypesVisitor - This DIVisitor gathers all the field types in
335 /// the supplied DebugInfoDesc.
336 class DIGetTypesVisitor : public DIVisitor {
338 DISerializer &SR; // Active serializer.
339 std::vector<const Type*> &Fields; // Type accumulator.
342 DIGetTypesVisitor(DISerializer &S, std::vector<const Type*> &F)
348 /// Apply - Set the value of each of the fields.
350 virtual void Apply(int &Field) {
351 Fields.push_back(Type::Int32Ty);
353 virtual void Apply(unsigned &Field) {
354 Fields.push_back(Type::Int32Ty);
356 virtual void Apply(int64_t &Field) {
357 Fields.push_back(Type::Int64Ty);
359 virtual void Apply(uint64_t &Field) {
360 Fields.push_back(Type::Int64Ty);
362 virtual void Apply(bool &Field) {
363 Fields.push_back(Type::Int1Ty);
365 virtual void Apply(std::string &Field) {
366 Fields.push_back(SR.getStrPtrType());
368 virtual void Apply(DebugInfoDesc *&Field) {
369 // FIXME - At some point should use specific type.
370 const PointerType *EmptyTy = SR.getEmptyStructPtrType();
371 Fields.push_back(EmptyTy);
373 virtual void Apply(GlobalVariable *&Field) {
374 const PointerType *EmptyTy = SR.getEmptyStructPtrType();
375 Fields.push_back(EmptyTy);
377 virtual void Apply(std::vector<DebugInfoDesc *> &Field) {
378 const PointerType *EmptyTy = SR.getEmptyStructPtrType();
379 Fields.push_back(EmptyTy);
383 //===----------------------------------------------------------------------===//
384 /// DIVerifyVisitor - This DIVisitor verifies all the field types against
385 /// a constant initializer.
386 class DIVerifyVisitor : public DIVisitor {
388 DIVerifier &VR; // Active verifier.
389 bool IsValid; // Validity status.
390 unsigned I; // Current operand index.
391 ConstantStruct *CI; // GlobalVariable constant initializer.
394 DIVerifyVisitor(DIVerifier &V, GlobalVariable *GV)
399 , CI(cast<ConstantStruct>(GV->getInitializer()))
404 bool isValid() const { return IsValid; }
406 /// Apply - Set the value of each of the fields.
408 virtual void Apply(int &Field) {
409 Constant *C = CI->getOperand(I++);
410 IsValid = IsValid && isa<ConstantInt>(C);
412 virtual void Apply(unsigned &Field) {
413 Constant *C = CI->getOperand(I++);
414 IsValid = IsValid && isa<ConstantInt>(C);
416 virtual void Apply(int64_t &Field) {
417 Constant *C = CI->getOperand(I++);
418 IsValid = IsValid && isa<ConstantInt>(C);
420 virtual void Apply(uint64_t &Field) {
421 Constant *C = CI->getOperand(I++);
422 IsValid = IsValid && isa<ConstantInt>(C);
424 virtual void Apply(bool &Field) {
425 Constant *C = CI->getOperand(I++);
426 IsValid = IsValid && isa<ConstantInt>(C) && C->getType() == Type::Int1Ty;
428 virtual void Apply(std::string &Field) {
429 Constant *C = CI->getOperand(I++);
431 (!C || isStringValue(C) || C->isNullValue());
433 virtual void Apply(DebugInfoDesc *&Field) {
434 // FIXME - Prepare the correct descriptor.
435 Constant *C = CI->getOperand(I++);
436 IsValid = IsValid && isGlobalVariable(C);
438 virtual void Apply(GlobalVariable *&Field) {
439 Constant *C = CI->getOperand(I++);
440 IsValid = IsValid && isGlobalVariable(C);
442 virtual void Apply(std::vector<DebugInfoDesc *> &Field) {
443 Constant *C = CI->getOperand(I++);
444 IsValid = IsValid && isGlobalVariable(C);
445 if (!IsValid) return;
447 GlobalVariable *GV = getGlobalVariable(C);
448 IsValid = IsValid && GV && GV->hasInitializer();
449 if (!IsValid) return;
451 ConstantArray *CA = dyn_cast<ConstantArray>(GV->getInitializer());
452 IsValid = IsValid && CA;
453 if (!IsValid) return;
455 for (unsigned i = 0, N = CA->getNumOperands(); IsValid && i < N; ++i) {
456 IsValid = IsValid && isGlobalVariable(CA->getOperand(i));
457 if (!IsValid) return;
459 GlobalVariable *GVE = getGlobalVariable(CA->getOperand(i));
467 //===----------------------------------------------------------------------===//
469 DebugInfoDesc *DIDeserializer::Deserialize(Value *V) {
470 return Deserialize(getGlobalVariable(V));
472 DebugInfoDesc *DIDeserializer::Deserialize(GlobalVariable *GV) {
474 if (!GV) return NULL;
476 // Check to see if it has been already deserialized.
477 DebugInfoDesc *&Slot = GlobalDescs[GV];
478 if (Slot) return Slot;
480 // Get the Tag from the global.
481 unsigned Tag = DebugInfoDesc::TagFromGlobal(GV);
483 // Create an empty instance of the correct sort.
484 Slot = DebugInfoDesc::DescFactory(Tag);
486 // If not a user defined descriptor.
488 // Deserialize the fields.
489 DIDeserializeVisitor DRAM(*this, GV);
490 DRAM.ApplyToFields(Slot);
496 //===----------------------------------------------------------------------===//
498 /// getStrPtrType - Return a "sbyte *" type.
500 const PointerType *DISerializer::getStrPtrType() {
501 // If not already defined.
503 // Construct the pointer to signed bytes.
504 StrPtrTy = PointerType::getUnqual(Type::Int8Ty);
510 /// getEmptyStructPtrType - Return a "{ }*" type.
512 const PointerType *DISerializer::getEmptyStructPtrType() {
513 // If not already defined.
514 if (!EmptyStructPtrTy) {
515 // Construct the empty structure type.
516 const StructType *EmptyStructTy = StructType::get(NULL, NULL);
518 // Construct the pointer to empty structure type.
519 EmptyStructPtrTy = PointerType::getUnqual(EmptyStructTy);
522 return EmptyStructPtrTy;
525 /// getTagType - Return the type describing the specified descriptor (via tag.)
527 const StructType *DISerializer::getTagType(DebugInfoDesc *DD) {
528 // Attempt to get the previously defined type.
529 StructType *&Ty = TagTypes[DD->getTag()];
531 // If not already defined.
533 // Set up fields vector.
534 std::vector<const Type*> Fields;
536 // Get types of fields.
537 DIGetTypesVisitor GTAM(*this, Fields);
538 GTAM.ApplyToFields(DD);
540 // Construct structured type.
541 Ty = StructType::get(Fields);
543 // Register type name with module.
544 M->addTypeName(DD->getTypeString(), Ty);
550 /// getString - Construct the string as constant string global.
552 Constant *DISerializer::getString(const std::string &String) {
553 // Check string cache for previous edition.
554 Constant *&Slot = StringCache[String];
556 // Return Constant if previously defined.
557 if (Slot) return Slot;
559 // If empty string then use a sbyte* null instead.
560 if (String.empty()) {
561 Slot = ConstantPointerNull::get(getStrPtrType());
563 // Construct string as an llvm constant.
564 Constant *ConstStr = ConstantArray::get(String);
566 // Otherwise create and return a new string global.
567 GlobalVariable *StrGV = new GlobalVariable(ConstStr->getType(), true,
568 GlobalVariable::InternalLinkage,
569 ConstStr, ".str", M);
570 StrGV->setSection("llvm.metadata");
572 // Convert to generic string pointer.
573 Slot = ConstantExpr::getBitCast(StrGV, getStrPtrType());
580 /// Serialize - Recursively cast the specified descriptor into a GlobalVariable
581 /// so that it can be serialized to a .bc or .ll file.
582 GlobalVariable *DISerializer::Serialize(DebugInfoDesc *DD) {
583 // Check if the DebugInfoDesc is already in the map.
584 GlobalVariable *&Slot = DescGlobals[DD];
586 // See if DebugInfoDesc exists, if so return prior GlobalVariable.
587 if (Slot) return Slot;
589 // Get the type associated with the Tag.
590 const StructType *Ty = getTagType(DD);
592 // Create the GlobalVariable early to prevent infinite recursion.
593 GlobalVariable *GV = new GlobalVariable(Ty, true, DD->getLinkage(),
594 NULL, DD->getDescString(), M);
595 GV->setSection("llvm.metadata");
597 // Insert new GlobalVariable in DescGlobals map.
600 // Set up elements vector
601 std::vector<Constant*> Elements;
604 DISerializeVisitor SRAM(*this, Elements);
605 SRAM.ApplyToFields(DD);
607 // Set the globals initializer.
608 GV->setInitializer(ConstantStruct::get(Ty, Elements));
613 /// addDescriptor - Directly connect DD with existing GV.
614 void DISerializer::addDescriptor(DebugInfoDesc *DD,
615 GlobalVariable *GV) {
616 DescGlobals[DD] = GV;
619 //===----------------------------------------------------------------------===//
621 /// Verify - Return true if the GlobalVariable appears to be a valid
622 /// serialization of a DebugInfoDesc.
623 bool DIVerifier::Verify(Value *V) {
624 return !V || Verify(getGlobalVariable(V));
626 bool DIVerifier::Verify(GlobalVariable *GV) {
628 if (!GV) return true;
630 // Check prior validity.
631 unsigned &ValiditySlot = Validity[GV];
633 // If visited before then use old state.
634 if (ValiditySlot) return ValiditySlot == Valid;
636 // Assume validity for the time being (recursion.)
637 ValiditySlot = Valid;
639 // Make sure the global is internal or link once (anchor.)
640 if (GV->getLinkage() != GlobalValue::InternalLinkage &&
641 GV->getLinkage() != GlobalValue::LinkOnceLinkage) {
642 ValiditySlot = Invalid;
647 unsigned Tag = DebugInfoDesc::TagFromGlobal(GV);
649 // Check for user defined descriptors.
650 if (Tag == DW_TAG_invalid) {
651 ValiditySlot = Valid;
656 unsigned Version = DebugInfoDesc::VersionFromGlobal(GV);
658 // Check for version mismatch.
659 if (Version != LLVMDebugVersion) {
660 ValiditySlot = Invalid;
664 // Construct an empty DebugInfoDesc.
665 DebugInfoDesc *DD = DebugInfoDesc::DescFactory(Tag);
667 // Allow for user defined descriptors.
668 if (!DD) return true;
670 // Get the initializer constant.
671 ConstantStruct *CI = cast<ConstantStruct>(GV->getInitializer());
673 // Get the operand count.
674 unsigned N = CI->getNumOperands();
676 // Get the field count.
677 unsigned &CountSlot = Counts[Tag];
679 // Check the operand count to the field count
681 CTAM.ApplyToFields(DD);
682 CountSlot = CTAM.getCount();
685 // Field count must be at most equal operand count.
688 ValiditySlot = Invalid;
692 // Check each field for valid type.
693 DIVerifyVisitor VRAM(*this, GV);
694 VRAM.ApplyToFields(DD);
696 // Release empty DebugInfoDesc.
699 // If fields are not valid.
700 if (!VRAM.isValid()) {
701 ValiditySlot = Invalid;
708 /// isVerified - Return true if the specified GV has already been
709 /// verified as a debug information descriptor.
710 bool DIVerifier::isVerified(GlobalVariable *GV) {
711 unsigned &ValiditySlot = Validity[GV];
712 if (ValiditySlot) return ValiditySlot == Valid;
716 //===----------------------------------------------------------------------===//
718 DebugScope::~DebugScope() {
719 for (unsigned i = 0, N = Scopes.size(); i < N; ++i) delete Scopes[i];
720 for (unsigned j = 0, M = Variables.size(); j < M; ++j) delete Variables[j];
723 //===----------------------------------------------------------------------===//
725 MachineModuleInfo::MachineModuleInfo()
726 : ImmutablePass((intptr_t)&ID)
742 // Always emit "no personality" info
743 Personalities.push_back(NULL);
745 MachineModuleInfo::~MachineModuleInfo() {
749 /// doInitialization - Initialize the state for a new module.
751 bool MachineModuleInfo::doInitialization() {
755 /// doFinalization - Tear down the state after completion of a module.
757 bool MachineModuleInfo::doFinalization() {
761 /// BeginFunction - Begin gathering function meta information.
763 void MachineModuleInfo::BeginFunction(MachineFunction *MF) {
767 /// EndFunction - Discard function meta information.
769 void MachineModuleInfo::EndFunction() {
770 // Clean up scope information.
777 // Clean up line info.
780 // Clean up frame info.
783 // Clean up exception info.
792 /// getDescFor - Convert a Value to a debug information descriptor.
794 // FIXME - use new Value type when available.
795 DebugInfoDesc *MachineModuleInfo::getDescFor(Value *V) {
796 return DR.Deserialize(V);
799 /// AnalyzeModule - Scan the module for global debug information.
801 void MachineModuleInfo::AnalyzeModule(Module &M) {
802 SetupCompileUnits(M);
804 // Insert functions in the llvm.used array into UsedFunctions.
805 GlobalVariable *GV = M.getGlobalVariable("llvm.used");
806 if (!GV || !GV->hasInitializer()) return;
808 // Should be an array of 'i8*'.
809 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
810 if (InitList == 0) return;
812 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
813 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(InitList->getOperand(i)))
814 if (CE->getOpcode() == Instruction::BitCast)
815 if (Function *F = dyn_cast<Function>(CE->getOperand(0)))
816 UsedFunctions.insert(F);
820 /// SetupCompileUnits - Set up the unique vector of compile units.
822 void MachineModuleInfo::SetupCompileUnits(Module &M) {
823 std::vector<void*> CUList;
825 getAnchoredDescriptors(M, &CUD, CUList);
827 for (unsigned i = 0, N = CUList.size(); i < N; i++)
828 CompileUnits.insert((CompileUnitDesc*)CUList[i]);
831 /// getCompileUnits - Return a vector of debug compile units.
833 const UniqueVector<CompileUnitDesc *> MachineModuleInfo::getCompileUnits()const{
837 /// getAnchoredDescriptors - Return a vector of anchored debug descriptors.
840 MachineModuleInfo::getAnchoredDescriptors(Module &M, const AnchoredDesc *Desc,
841 std::vector<void*> &AnchoredDescs) {
842 std::vector<GlobalVariable*> Globals;
843 getGlobalVariablesUsing(M, Desc->getAnchorString(), Globals);
845 for (unsigned i = 0, N = Globals.size(); i < N; ++i) {
846 GlobalVariable *GV = Globals[i];
848 // FIXME - In the short term, changes are too drastic to continue.
849 if (DebugInfoDesc::TagFromGlobal(GV) == Desc->getTag() &&
850 DebugInfoDesc::VersionFromGlobal(GV) == LLVMDebugVersion)
851 AnchoredDescs.push_back(DR.Deserialize(GV));
855 /// getGlobalVariablesUsing - Return all of the GlobalVariables that use the
856 /// named GlobalVariable.
858 MachineModuleInfo::getGlobalVariablesUsing(Module &M,
859 const std::string &RootName,
860 std::vector<GlobalVariable*> &Globals) {
861 return ::getGlobalVariablesUsing(M, RootName, Globals);
864 /// RecordSourceLine - Records location information and associates it with a
865 /// debug label. Returns a unique label ID used to generate a label and
866 /// provide correspondence to the source line list.
867 unsigned MachineModuleInfo::RecordSourceLine(unsigned Line, unsigned Column,
869 unsigned ID = NextLabelID();
870 Lines.push_back(SourceLineInfo(Line, Column, Source, ID));
874 /// RecordSource - Register a source file with debug info. Returns an source
876 unsigned MachineModuleInfo::RecordSource(const std::string &Directory,
877 const std::string &Source) {
878 unsigned DirectoryID = Directories.insert(Directory);
879 return SourceFiles.insert(SourceFileInfo(DirectoryID, Source));
881 unsigned MachineModuleInfo::RecordSource(const CompileUnitDesc *CompileUnit) {
882 return RecordSource(CompileUnit->getDirectory(),
883 CompileUnit->getFileName());
886 /// RecordRegionStart - Indicate the start of a region.
888 unsigned MachineModuleInfo::RecordRegionStart(Value *V) {
889 // FIXME - need to be able to handle split scopes because of bb cloning.
890 DebugInfoDesc *ScopeDesc = DR.Deserialize(V);
891 DebugScope *Scope = getOrCreateScope(ScopeDesc);
892 unsigned ID = NextLabelID();
893 if (!Scope->getStartLabelID()) Scope->setStartLabelID(ID);
897 /// RecordRegionEnd - Indicate the end of a region.
899 unsigned MachineModuleInfo::RecordRegionEnd(Value *V) {
900 // FIXME - need to be able to handle split scopes because of bb cloning.
901 DebugInfoDesc *ScopeDesc = DR.Deserialize(V);
902 DebugScope *Scope = getOrCreateScope(ScopeDesc);
903 unsigned ID = NextLabelID();
904 Scope->setEndLabelID(ID);
908 /// RecordVariable - Indicate the declaration of a local variable.
910 void MachineModuleInfo::RecordVariable(GlobalValue *GV, unsigned FrameIndex) {
911 VariableDesc *VD = cast<VariableDesc>(DR.Deserialize(GV));
912 DebugScope *Scope = getOrCreateScope(VD->getContext());
913 DebugVariable *DV = new DebugVariable(VD, FrameIndex);
914 Scope->AddVariable(DV);
917 /// getOrCreateScope - Returns the scope associated with the given descriptor.
919 DebugScope *MachineModuleInfo::getOrCreateScope(DebugInfoDesc *ScopeDesc) {
920 DebugScope *&Slot = ScopeMap[ScopeDesc];
922 // FIXME - breaks down when the context is an inlined function.
923 DebugInfoDesc *ParentDesc = NULL;
924 if (BlockDesc *Block = dyn_cast<BlockDesc>(ScopeDesc)) {
925 ParentDesc = Block->getContext();
927 DebugScope *Parent = ParentDesc ? getOrCreateScope(ParentDesc) : NULL;
928 Slot = new DebugScope(Parent, ScopeDesc);
930 Parent->AddScope(Slot);
931 } else if (RootScope) {
932 // FIXME - Add inlined function scopes to the root so we can delete
933 // them later. Long term, handle inlined functions properly.
934 RootScope->AddScope(Slot);
936 // First function is top level function.
943 //===-EH-------------------------------------------------------------------===//
945 /// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the
946 /// specified MachineBasicBlock.
947 LandingPadInfo &MachineModuleInfo::getOrCreateLandingPadInfo
948 (MachineBasicBlock *LandingPad) {
949 unsigned N = LandingPads.size();
950 for (unsigned i = 0; i < N; ++i) {
951 LandingPadInfo &LP = LandingPads[i];
952 if (LP.LandingPadBlock == LandingPad)
956 LandingPads.push_back(LandingPadInfo(LandingPad));
957 return LandingPads[N];
960 /// addInvoke - Provide the begin and end labels of an invoke style call and
961 /// associate it with a try landing pad block.
962 void MachineModuleInfo::addInvoke(MachineBasicBlock *LandingPad,
963 unsigned BeginLabel, unsigned EndLabel) {
964 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
965 LP.BeginLabels.push_back(BeginLabel);
966 LP.EndLabels.push_back(EndLabel);
969 /// addLandingPad - Provide the label of a try LandingPad block.
971 unsigned MachineModuleInfo::addLandingPad(MachineBasicBlock *LandingPad) {
972 unsigned LandingPadLabel = NextLabelID();
973 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
974 LP.LandingPadLabel = LandingPadLabel;
975 return LandingPadLabel;
978 /// addPersonality - Provide the personality function for the exception
980 void MachineModuleInfo::addPersonality(MachineBasicBlock *LandingPad,
981 Function *Personality) {
982 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
983 LP.Personality = Personality;
985 for (unsigned i = 0; i < Personalities.size(); ++i)
986 if (Personalities[i] == Personality)
989 Personalities.push_back(Personality);
992 /// addCatchTypeInfo - Provide the catch typeinfo for a landing pad.
994 void MachineModuleInfo::addCatchTypeInfo(MachineBasicBlock *LandingPad,
995 std::vector<GlobalVariable *> &TyInfo) {
996 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
997 for (unsigned N = TyInfo.size(); N; --N)
998 LP.TypeIds.push_back(getTypeIDFor(TyInfo[N - 1]));
1001 /// addFilterTypeInfo - Provide the filter typeinfo for a landing pad.
1003 void MachineModuleInfo::addFilterTypeInfo(MachineBasicBlock *LandingPad,
1004 std::vector<GlobalVariable *> &TyInfo) {
1005 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
1006 SmallVector<unsigned, 32> IdsInFilter(TyInfo.size());
1008 for (unsigned I = 0, E = TyInfo.size(); I != E; ++I)
1009 IdsInFilter[I] = getTypeIDFor(TyInfo[I]);
1011 LP.TypeIds.push_back(getFilterIDFor(IdsInFilter));
1014 /// addCleanup - Add a cleanup action for a landing pad.
1016 void MachineModuleInfo::addCleanup(MachineBasicBlock *LandingPad) {
1017 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
1018 LP.TypeIds.push_back(0);
1021 /// TidyLandingPads - Remap landing pad labels and remove any deleted landing
1023 void MachineModuleInfo::TidyLandingPads() {
1024 for (unsigned i = 0; i != LandingPads.size(); ) {
1025 LandingPadInfo &LandingPad = LandingPads[i];
1026 LandingPad.LandingPadLabel = MappedLabel(LandingPad.LandingPadLabel);
1028 // Special case: we *should* emit LPs with null LP MBB. This indicates
1030 if (!LandingPad.LandingPadLabel && LandingPad.LandingPadBlock) {
1031 LandingPads.erase(LandingPads.begin() + i);
1035 for (unsigned j=0; j != LandingPads[i].BeginLabels.size(); ) {
1036 unsigned BeginLabel = MappedLabel(LandingPad.BeginLabels[j]);
1037 unsigned EndLabel = MappedLabel(LandingPad.EndLabels[j]);
1039 if (!BeginLabel || !EndLabel) {
1040 LandingPad.BeginLabels.erase(LandingPad.BeginLabels.begin() + j);
1041 LandingPad.EndLabels.erase(LandingPad.EndLabels.begin() + j);
1045 LandingPad.BeginLabels[j] = BeginLabel;
1046 LandingPad.EndLabels[j] = EndLabel;
1050 // Remove landing pads with no try-ranges.
1051 if (LandingPads[i].BeginLabels.empty()) {
1052 LandingPads.erase(LandingPads.begin() + i);
1056 // If there is no landing pad, ensure that the list of typeids is empty.
1057 // If the only typeid is a cleanup, this is the same as having no typeids.
1058 if (!LandingPad.LandingPadBlock ||
1059 (LandingPad.TypeIds.size() == 1 && !LandingPad.TypeIds[0]))
1060 LandingPad.TypeIds.clear();
1066 /// getTypeIDFor - Return the type id for the specified typeinfo. This is
1068 unsigned MachineModuleInfo::getTypeIDFor(GlobalVariable *TI) {
1069 for (unsigned i = 0, N = TypeInfos.size(); i != N; ++i)
1070 if (TypeInfos[i] == TI) return i + 1;
1072 TypeInfos.push_back(TI);
1073 return TypeInfos.size();
1076 /// getFilterIDFor - Return the filter id for the specified typeinfos. This is
1078 int MachineModuleInfo::getFilterIDFor(SmallVectorImpl<unsigned> &TyIds) {
1079 // If the new filter coincides with the tail of an existing filter, then
1080 // re-use the existing filter. Folding filters more than this requires
1081 // re-ordering filters and/or their elements - probably not worth it.
1082 unsigned TyIDSize = TyIds.size();
1083 for (std::vector<unsigned>::iterator I = FilterEnds.begin(),
1084 E = FilterEnds.end(); I != E; ++I) {
1085 unsigned i = *I, j = TyIDSize;
1088 if (FilterIds[--i] != TyIds[--j])
1092 // The new filter coincides with range [i, end) of the existing filter.
1097 // Add the new filter.
1098 unsigned FilterIDSize = FilterIds.size();
1099 int FilterID = -(1 + FilterIDSize);
1100 FilterIds.reserve(FilterIDSize + TyIDSize + 1);
1102 for (unsigned I = 0, N = TyIDSize; I != N; ++I)
1103 FilterIds.push_back(TyIds[I]);
1105 FilterEnds.push_back(FilterIDSize);
1106 FilterIds.push_back(0); // terminator
1110 /// getPersonality - Return the personality function for the current function.
1111 Function *MachineModuleInfo::getPersonality() const {
1112 // FIXME: Until PR1414 will be fixed, we're using 1 personality function per
1114 return !LandingPads.empty() ? LandingPads[0].Personality : NULL;
1117 /// getPersonalityIndex - Return unique index for current personality
1118 /// function. NULL personality function should always get zero index.
1119 unsigned MachineModuleInfo::getPersonalityIndex() const {
1120 const Function* Personality = NULL;
1122 // Scan landing pads. If there is at least one non-NULL personality - use it.
1123 for (unsigned i = 0, e = LandingPads.size(); i != e; ++i)
1124 if (LandingPads[i].Personality) {
1125 Personality = LandingPads[i].Personality;
1129 for (unsigned i = 0, e = Personalities.size(); i < e; ++i) {
1130 if (Personalities[i] == Personality)
1134 // This should never happen
1135 assert(0 && "Personality function should be set!");
1139 //===----------------------------------------------------------------------===//
1140 /// DebugLabelFolding pass - This pass prunes out redundant labels. This allows
1141 /// a info consumer to determine if the range of two labels is empty, by seeing
1142 /// if the labels map to the same reduced label.
1146 struct DebugLabelFolder : public MachineFunctionPass {
1148 DebugLabelFolder() : MachineFunctionPass((intptr_t)&ID) {}
1150 virtual bool runOnMachineFunction(MachineFunction &MF);
1151 virtual const char *getPassName() const { return "Label Folder"; }
1154 char DebugLabelFolder::ID = 0;
1156 bool DebugLabelFolder::runOnMachineFunction(MachineFunction &MF) {
1157 // Get machine module info.
1158 MachineModuleInfo *MMI = getAnalysisToUpdate<MachineModuleInfo>();
1159 if (!MMI) return false;
1161 // Track if change is made.
1162 bool MadeChange = false;
1163 // No prior label to begin.
1164 unsigned PriorLabel = 0;
1166 // Iterate through basic blocks.
1167 for (MachineFunction::iterator BB = MF.begin(), E = MF.end();
1169 // Iterate through instructions.
1170 for (MachineBasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ) {
1172 if (I->isDebugLabel()) {
1173 // The label ID # is always operand #0, an immediate.
1174 unsigned NextLabel = I->getOperand(0).getImm();
1176 // If there was an immediate prior label.
1178 // Remap the current label to prior label.
1179 MMI->RemapLabel(NextLabel, PriorLabel);
1180 // Delete the current label.
1182 // Indicate a change has been made.
1186 // Start a new round.
1187 PriorLabel = NextLabel;
1190 // No consecutive labels.
1201 FunctionPass *createDebugLabelFoldingPass() { return new DebugLabelFolder(); }