1 //===-- Type.cpp - Implement the Type class -------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Type class for the VMCore library.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/AbstractTypeUser.h"
15 #include "llvm/DerivedTypes.h"
16 #include "llvm/SymbolTable.h"
17 #include "llvm/Constants.h"
18 #include "llvm/ADT/DepthFirstIterator.h"
19 #include "llvm/ADT/StringExtras.h"
20 #include "llvm/ADT/SCCIterator.h"
21 #include "llvm/ADT/STLExtras.h"
22 #include "llvm/Support/MathExtras.h"
23 #include "llvm/Support/Compiler.h"
24 #include "llvm/Support/ManagedStatic.h"
25 #include "llvm/Support/Debug.h"
29 // DEBUG_MERGE_TYPES - Enable this #define to see how and when derived types are
30 // created and later destroyed, all in an effort to make sure that there is only
31 // a single canonical version of a type.
33 // #define DEBUG_MERGE_TYPES 1
35 AbstractTypeUser::~AbstractTypeUser() {}
38 //===----------------------------------------------------------------------===//
39 // Type PATypeHolder Implementation
40 //===----------------------------------------------------------------------===//
42 /// get - This implements the forwarding part of the union-find algorithm for
43 /// abstract types. Before every access to the Type*, we check to see if the
44 /// type we are pointing to is forwarding to a new type. If so, we drop our
45 /// reference to the type.
47 Type* PATypeHolder::get() const {
48 const Type *NewTy = Ty->getForwardedType();
49 if (!NewTy) return const_cast<Type*>(Ty);
50 return *const_cast<PATypeHolder*>(this) = NewTy;
53 //===----------------------------------------------------------------------===//
54 // Type Class Implementation
55 //===----------------------------------------------------------------------===//
57 // Concrete/Abstract TypeDescriptions - We lazily calculate type descriptions
58 // for types as they are needed. Because resolution of types must invalidate
59 // all of the abstract type descriptions, we keep them in a seperate map to make
61 static ManagedStatic<std::map<const Type*,
62 std::string> > ConcreteTypeDescriptions;
63 static ManagedStatic<std::map<const Type*,
64 std::string> > AbstractTypeDescriptions;
66 Type::Type(const char *Name, TypeID id)
67 : ID(id), Abstract(false), SubclassData(0), RefCount(0), ForwardType(0) {
68 assert(Name && Name[0] && "Should use other ctor if no name!");
69 (*ConcreteTypeDescriptions)[this] = Name;
73 const Type *Type::getPrimitiveType(TypeID IDNumber) {
75 case VoidTyID : return VoidTy;
76 case FloatTyID : return FloatTy;
77 case DoubleTyID: return DoubleTy;
78 case LabelTyID : return LabelTy;
84 /// isFPOrFPVector - Return true if this is a FP type or a vector of FP types.
86 bool Type::isFPOrFPVector() const {
87 if (ID == Type::FloatTyID || ID == Type::DoubleTyID) return true;
88 if (ID != Type::PackedTyID) return false;
90 return cast<PackedType>(this)->getElementType()->isFloatingPoint();
93 // canLosslesllyBitCastTo - Return true if this type can be converted to
94 // 'Ty' without any reinterpretation of bits. For example, uint to int.
96 bool Type::canLosslesslyBitCastTo(const Type *Ty) const {
97 // Identity cast means no change so return true
101 // They are not convertible unless they are at least first class types
102 if (!this->isFirstClassType() || !Ty->isFirstClassType())
105 // Packed -> Packed conversions are always lossless if the two packed types
106 // have the same size, otherwise not.
107 if (const PackedType *thisPTy = dyn_cast<PackedType>(this))
108 if (const PackedType *thatPTy = dyn_cast<PackedType>(Ty))
109 return thisPTy->getBitWidth() == thatPTy->getBitWidth();
111 // At this point we have only various mismatches of the first class types
112 // remaining and ptr->ptr. Just select the lossless conversions. Everything
113 // else is not lossless.
114 if (isa<PointerType>(this))
115 return isa<PointerType>(Ty);
116 return false; // Other types have no identity values
119 unsigned Type::getPrimitiveSizeInBits() const {
120 switch (getTypeID()) {
121 case Type::FloatTyID: return 32;
122 case Type::DoubleTyID: return 64;
123 case Type::IntegerTyID: return cast<IntegerType>(this)->getBitWidth();
124 case Type::PackedTyID: return cast<PackedType>(this)->getBitWidth();
129 /// isSizedDerivedType - Derived types like structures and arrays are sized
130 /// iff all of the members of the type are sized as well. Since asking for
131 /// their size is relatively uncommon, move this operation out of line.
132 bool Type::isSizedDerivedType() const {
133 if (const ArrayType *ATy = dyn_cast<ArrayType>(this))
134 return ATy->getElementType()->isSized();
136 if (const PackedType *PTy = dyn_cast<PackedType>(this))
137 return PTy->getElementType()->isSized();
139 if (!isa<StructType>(this))
142 // Okay, our struct is sized if all of the elements are...
143 for (subtype_iterator I = subtype_begin(), E = subtype_end(); I != E; ++I)
144 if (!(*I)->isSized())
150 /// getForwardedTypeInternal - This method is used to implement the union-find
151 /// algorithm for when a type is being forwarded to another type.
152 const Type *Type::getForwardedTypeInternal() const {
153 assert(ForwardType && "This type is not being forwarded to another type!");
155 // Check to see if the forwarded type has been forwarded on. If so, collapse
156 // the forwarding links.
157 const Type *RealForwardedType = ForwardType->getForwardedType();
158 if (!RealForwardedType)
159 return ForwardType; // No it's not forwarded again
161 // Yes, it is forwarded again. First thing, add the reference to the new
163 if (RealForwardedType->isAbstract())
164 cast<DerivedType>(RealForwardedType)->addRef();
166 // Now drop the old reference. This could cause ForwardType to get deleted.
167 cast<DerivedType>(ForwardType)->dropRef();
169 // Return the updated type.
170 ForwardType = RealForwardedType;
174 void Type::refineAbstractType(const DerivedType *OldTy, const Type *NewTy) {
177 void Type::typeBecameConcrete(const DerivedType *AbsTy) {
182 // getTypeDescription - This is a recursive function that walks a type hierarchy
183 // calculating the description for a type.
185 static std::string getTypeDescription(const Type *Ty,
186 std::vector<const Type *> &TypeStack) {
187 if (isa<OpaqueType>(Ty)) { // Base case for the recursion
188 std::map<const Type*, std::string>::iterator I =
189 AbstractTypeDescriptions->lower_bound(Ty);
190 if (I != AbstractTypeDescriptions->end() && I->first == Ty)
192 std::string Desc = "opaque";
193 AbstractTypeDescriptions->insert(std::make_pair(Ty, Desc));
197 if (!Ty->isAbstract()) { // Base case for the recursion
198 std::map<const Type*, std::string>::iterator I =
199 ConcreteTypeDescriptions->find(Ty);
200 if (I != ConcreteTypeDescriptions->end()) return I->second;
203 // Check to see if the Type is already on the stack...
204 unsigned Slot = 0, CurSize = TypeStack.size();
205 while (Slot < CurSize && TypeStack[Slot] != Ty) ++Slot; // Scan for type
207 // This is another base case for the recursion. In this case, we know
208 // that we have looped back to a type that we have previously visited.
209 // Generate the appropriate upreference to handle this.
212 return "\\" + utostr(CurSize-Slot); // Here's the upreference
214 // Recursive case: derived types...
216 TypeStack.push_back(Ty); // Add us to the stack..
218 switch (Ty->getTypeID()) {
219 case Type::IntegerTyID: {
220 const IntegerType *ITy = cast<IntegerType>(Ty);
221 Result = "i" + utostr(ITy->getBitWidth());
224 case Type::FunctionTyID: {
225 const FunctionType *FTy = cast<FunctionType>(Ty);
228 Result += getTypeDescription(FTy->getReturnType(), TypeStack) + " (";
230 for (FunctionType::param_iterator I = FTy->param_begin(),
231 E = FTy->param_end(); I != E; ++I) {
232 if (I != FTy->param_begin())
234 Result += FunctionType::getParamAttrsText(FTy->getParamAttrs(Idx));
236 Result += getTypeDescription(*I, TypeStack);
238 if (FTy->isVarArg()) {
239 if (FTy->getNumParams()) Result += ", ";
243 if (FTy->getParamAttrs(0)) {
244 Result += " " + FunctionType::getParamAttrsText(FTy->getParamAttrs(0));
248 case Type::PackedStructTyID:
249 case Type::StructTyID: {
250 const StructType *STy = cast<StructType>(Ty);
255 for (StructType::element_iterator I = STy->element_begin(),
256 E = STy->element_end(); I != E; ++I) {
257 if (I != STy->element_begin())
259 Result += getTypeDescription(*I, TypeStack);
266 case Type::PointerTyID: {
267 const PointerType *PTy = cast<PointerType>(Ty);
268 Result = getTypeDescription(PTy->getElementType(), TypeStack) + " *";
271 case Type::ArrayTyID: {
272 const ArrayType *ATy = cast<ArrayType>(Ty);
273 unsigned NumElements = ATy->getNumElements();
275 Result += utostr(NumElements) + " x ";
276 Result += getTypeDescription(ATy->getElementType(), TypeStack) + "]";
279 case Type::PackedTyID: {
280 const PackedType *PTy = cast<PackedType>(Ty);
281 unsigned NumElements = PTy->getNumElements();
283 Result += utostr(NumElements) + " x ";
284 Result += getTypeDescription(PTy->getElementType(), TypeStack) + ">";
289 assert(0 && "Unhandled type in getTypeDescription!");
292 TypeStack.pop_back(); // Remove self from stack...
299 static const std::string &getOrCreateDesc(std::map<const Type*,std::string>&Map,
301 std::map<const Type*, std::string>::iterator I = Map.find(Ty);
302 if (I != Map.end()) return I->second;
304 std::vector<const Type *> TypeStack;
305 std::string Result = getTypeDescription(Ty, TypeStack);
306 return Map[Ty] = Result;
310 const std::string &Type::getDescription() const {
312 return getOrCreateDesc(*AbstractTypeDescriptions, this);
314 return getOrCreateDesc(*ConcreteTypeDescriptions, this);
318 bool StructType::indexValid(const Value *V) const {
319 // Structure indexes require 32-bit integer constants.
320 if (V->getType() == Type::Int32Ty)
321 if (const ConstantInt *CU = dyn_cast<ConstantInt>(V))
322 return CU->getZExtValue() < ContainedTys.size();
326 // getTypeAtIndex - Given an index value into the type, return the type of the
327 // element. For a structure type, this must be a constant value...
329 const Type *StructType::getTypeAtIndex(const Value *V) const {
330 assert(indexValid(V) && "Invalid structure index!");
331 unsigned Idx = (unsigned)cast<ConstantInt>(V)->getZExtValue();
332 return ContainedTys[Idx];
335 //===----------------------------------------------------------------------===//
336 // Primitive 'Type' data
337 //===----------------------------------------------------------------------===//
339 #define DeclarePrimType(TY, Str) \
341 struct VISIBILITY_HIDDEN TY##Type : public Type { \
342 TY##Type() : Type(Str, Type::TY##TyID) {} \
345 static ManagedStatic<TY##Type> The##TY##Ty; \
346 const Type *Type::TY##Ty = &*The##TY##Ty
348 #define DeclareIntegerType(TY, BitWidth) \
350 struct VISIBILITY_HIDDEN TY##Type : public IntegerType { \
351 TY##Type() : IntegerType(BitWidth) {} \
354 static ManagedStatic<TY##Type> The##TY##Ty; \
355 const Type *Type::TY##Ty = &*The##TY##Ty
357 DeclarePrimType(Void, "void");
358 DeclarePrimType(Float, "float");
359 DeclarePrimType(Double, "double");
360 DeclarePrimType(Label, "label");
361 DeclareIntegerType(Int1, 1);
362 DeclareIntegerType(Int8, 8);
363 DeclareIntegerType(Int16, 16);
364 DeclareIntegerType(Int32, 32);
365 DeclareIntegerType(Int64, 64);
366 #undef DeclarePrimType
369 //===----------------------------------------------------------------------===//
370 // Derived Type Constructors
371 //===----------------------------------------------------------------------===//
373 FunctionType::FunctionType(const Type *Result,
374 const std::vector<const Type*> &Params,
375 bool IsVarArgs, const ParamAttrsList &Attrs)
376 : DerivedType(FunctionTyID), isVarArgs(IsVarArgs) {
377 assert((Result->isFirstClassType() || Result == Type::VoidTy ||
378 isa<OpaqueType>(Result)) &&
379 "LLVM functions cannot return aggregates");
380 bool isAbstract = Result->isAbstract();
381 ContainedTys.reserve(Params.size()+1);
382 ContainedTys.push_back(PATypeHandle(Result, this));
384 for (unsigned i = 0; i != Params.size(); ++i) {
385 assert((Params[i]->isFirstClassType() || isa<OpaqueType>(Params[i])) &&
386 "Function arguments must be value types!");
388 ContainedTys.push_back(PATypeHandle(Params[i], this));
389 isAbstract |= Params[i]->isAbstract();
392 // Set the ParameterAttributes
394 ParamAttrs = new ParamAttrsList(Attrs);
398 // Calculate whether or not this type is abstract
399 setAbstract(isAbstract);
403 StructType::StructType(const std::vector<const Type*> &Types, bool isPacked)
404 : CompositeType(StructTyID) {
405 setSubclassData(isPacked);
406 ContainedTys.reserve(Types.size());
407 bool isAbstract = false;
408 for (unsigned i = 0; i < Types.size(); ++i) {
409 assert(Types[i] != Type::VoidTy && "Void type for structure field!!");
410 ContainedTys.push_back(PATypeHandle(Types[i], this));
411 isAbstract |= Types[i]->isAbstract();
414 // Calculate whether or not this type is abstract
415 setAbstract(isAbstract);
418 ArrayType::ArrayType(const Type *ElType, uint64_t NumEl)
419 : SequentialType(ArrayTyID, ElType) {
422 // Calculate whether or not this type is abstract
423 setAbstract(ElType->isAbstract());
426 PackedType::PackedType(const Type *ElType, unsigned NumEl)
427 : SequentialType(PackedTyID, ElType) {
430 assert(NumEl > 0 && "NumEl of a PackedType must be greater than 0");
431 assert((ElType->isInteger() || ElType->isFloatingPoint()) &&
432 "Elements of a PackedType must be a primitive type");
436 PointerType::PointerType(const Type *E) : SequentialType(PointerTyID, E) {
437 // Calculate whether or not this type is abstract
438 setAbstract(E->isAbstract());
441 OpaqueType::OpaqueType() : DerivedType(OpaqueTyID) {
443 #ifdef DEBUG_MERGE_TYPES
444 DOUT << "Derived new type: " << *this << "\n";
448 // dropAllTypeUses - When this (abstract) type is resolved to be equal to
449 // another (more concrete) type, we must eliminate all references to other
450 // types, to avoid some circular reference problems.
451 void DerivedType::dropAllTypeUses() {
452 if (!ContainedTys.empty()) {
453 // The type must stay abstract. To do this, we insert a pointer to a type
454 // that will never get resolved, thus will always be abstract.
455 static Type *AlwaysOpaqueTy = OpaqueType::get();
456 static PATypeHolder Holder(AlwaysOpaqueTy);
457 ContainedTys[0] = AlwaysOpaqueTy;
459 // Change the rest of the types to be intty's. It doesn't matter what we
460 // pick so long as it doesn't point back to this type. We choose something
461 // concrete to avoid overhead for adding to AbstracTypeUser lists and stuff.
462 for (unsigned i = 1, e = ContainedTys.size(); i != e; ++i)
463 ContainedTys[i] = Type::Int32Ty;
469 /// TypePromotionGraph and graph traits - this is designed to allow us to do
470 /// efficient SCC processing of type graphs. This is the exact same as
471 /// GraphTraits<Type*>, except that we pretend that concrete types have no
472 /// children to avoid processing them.
473 struct TypePromotionGraph {
475 TypePromotionGraph(Type *T) : Ty(T) {}
479 template <> struct GraphTraits<TypePromotionGraph> {
480 typedef Type NodeType;
481 typedef Type::subtype_iterator ChildIteratorType;
483 static inline NodeType *getEntryNode(TypePromotionGraph G) { return G.Ty; }
484 static inline ChildIteratorType child_begin(NodeType *N) {
486 return N->subtype_begin();
487 else // No need to process children of concrete types.
488 return N->subtype_end();
490 static inline ChildIteratorType child_end(NodeType *N) {
491 return N->subtype_end();
497 // PromoteAbstractToConcrete - This is a recursive function that walks a type
498 // graph calculating whether or not a type is abstract.
500 void Type::PromoteAbstractToConcrete() {
501 if (!isAbstract()) return;
503 scc_iterator<TypePromotionGraph> SI = scc_begin(TypePromotionGraph(this));
504 scc_iterator<TypePromotionGraph> SE = scc_end (TypePromotionGraph(this));
506 for (; SI != SE; ++SI) {
507 std::vector<Type*> &SCC = *SI;
509 // Concrete types are leaves in the tree. Since an SCC will either be all
510 // abstract or all concrete, we only need to check one type.
511 if (SCC[0]->isAbstract()) {
512 if (isa<OpaqueType>(SCC[0]))
513 return; // Not going to be concrete, sorry.
515 // If all of the children of all of the types in this SCC are concrete,
516 // then this SCC is now concrete as well. If not, neither this SCC, nor
517 // any parent SCCs will be concrete, so we might as well just exit.
518 for (unsigned i = 0, e = SCC.size(); i != e; ++i)
519 for (Type::subtype_iterator CI = SCC[i]->subtype_begin(),
520 E = SCC[i]->subtype_end(); CI != E; ++CI)
521 if ((*CI)->isAbstract())
522 // If the child type is in our SCC, it doesn't make the entire SCC
523 // abstract unless there is a non-SCC abstract type.
524 if (std::find(SCC.begin(), SCC.end(), *CI) == SCC.end())
525 return; // Not going to be concrete, sorry.
527 // Okay, we just discovered this whole SCC is now concrete, mark it as
529 for (unsigned i = 0, e = SCC.size(); i != e; ++i) {
530 assert(SCC[i]->isAbstract() && "Why are we processing concrete types?");
532 SCC[i]->setAbstract(false);
535 for (unsigned i = 0, e = SCC.size(); i != e; ++i) {
536 assert(!SCC[i]->isAbstract() && "Concrete type became abstract?");
537 // The type just became concrete, notify all users!
538 cast<DerivedType>(SCC[i])->notifyUsesThatTypeBecameConcrete();
545 //===----------------------------------------------------------------------===//
546 // Type Structural Equality Testing
547 //===----------------------------------------------------------------------===//
549 // TypesEqual - Two types are considered structurally equal if they have the
550 // same "shape": Every level and element of the types have identical primitive
551 // ID's, and the graphs have the same edges/nodes in them. Nodes do not have to
552 // be pointer equals to be equivalent though. This uses an optimistic algorithm
553 // that assumes that two graphs are the same until proven otherwise.
555 static bool TypesEqual(const Type *Ty, const Type *Ty2,
556 std::map<const Type *, const Type *> &EqTypes) {
557 if (Ty == Ty2) return true;
558 if (Ty->getTypeID() != Ty2->getTypeID()) return false;
559 if (isa<OpaqueType>(Ty))
560 return false; // Two unequal opaque types are never equal
562 std::map<const Type*, const Type*>::iterator It = EqTypes.lower_bound(Ty);
563 if (It != EqTypes.end() && It->first == Ty)
564 return It->second == Ty2; // Looping back on a type, check for equality
566 // Otherwise, add the mapping to the table to make sure we don't get
567 // recursion on the types...
568 EqTypes.insert(It, std::make_pair(Ty, Ty2));
570 // Two really annoying special cases that breaks an otherwise nice simple
571 // algorithm is the fact that arraytypes have sizes that differentiates types,
572 // and that function types can be varargs or not. Consider this now.
574 if (const IntegerType *ITy = dyn_cast<IntegerType>(Ty)) {
575 const IntegerType *ITy2 = cast<IntegerType>(Ty2);
576 return ITy->getBitWidth() == ITy2->getBitWidth();
577 } else if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) {
578 return TypesEqual(PTy->getElementType(),
579 cast<PointerType>(Ty2)->getElementType(), EqTypes);
580 } else if (const StructType *STy = dyn_cast<StructType>(Ty)) {
581 const StructType *STy2 = cast<StructType>(Ty2);
582 if (STy->getNumElements() != STy2->getNumElements()) return false;
583 if (STy->isPacked() != STy2->isPacked()) return false;
584 for (unsigned i = 0, e = STy2->getNumElements(); i != e; ++i)
585 if (!TypesEqual(STy->getElementType(i), STy2->getElementType(i), EqTypes))
588 } else if (const ArrayType *ATy = dyn_cast<ArrayType>(Ty)) {
589 const ArrayType *ATy2 = cast<ArrayType>(Ty2);
590 return ATy->getNumElements() == ATy2->getNumElements() &&
591 TypesEqual(ATy->getElementType(), ATy2->getElementType(), EqTypes);
592 } else if (const PackedType *PTy = dyn_cast<PackedType>(Ty)) {
593 const PackedType *PTy2 = cast<PackedType>(Ty2);
594 return PTy->getNumElements() == PTy2->getNumElements() &&
595 TypesEqual(PTy->getElementType(), PTy2->getElementType(), EqTypes);
596 } else if (const FunctionType *FTy = dyn_cast<FunctionType>(Ty)) {
597 const FunctionType *FTy2 = cast<FunctionType>(Ty2);
598 if (FTy->isVarArg() != FTy2->isVarArg() ||
599 FTy->getNumParams() != FTy2->getNumParams() ||
600 FTy->getNumAttrs() != FTy2->getNumAttrs() ||
601 FTy->getParamAttrs(0) != FTy2->getParamAttrs(0) ||
602 !TypesEqual(FTy->getReturnType(), FTy2->getReturnType(), EqTypes))
604 for (unsigned i = 0, e = FTy2->getNumParams(); i != e; ++i) {
605 if (FTy->getParamAttrs(i+1) != FTy->getParamAttrs(i+1))
607 if (!TypesEqual(FTy->getParamType(i), FTy2->getParamType(i), EqTypes))
612 assert(0 && "Unknown derived type!");
617 static bool TypesEqual(const Type *Ty, const Type *Ty2) {
618 std::map<const Type *, const Type *> EqTypes;
619 return TypesEqual(Ty, Ty2, EqTypes);
622 // AbstractTypeHasCycleThrough - Return true there is a path from CurTy to
623 // TargetTy in the type graph. We know that Ty is an abstract type, so if we
624 // ever reach a non-abstract type, we know that we don't need to search the
626 static bool AbstractTypeHasCycleThrough(const Type *TargetTy, const Type *CurTy,
627 std::set<const Type*> &VisitedTypes) {
628 if (TargetTy == CurTy) return true;
629 if (!CurTy->isAbstract()) return false;
631 if (!VisitedTypes.insert(CurTy).second)
632 return false; // Already been here.
634 for (Type::subtype_iterator I = CurTy->subtype_begin(),
635 E = CurTy->subtype_end(); I != E; ++I)
636 if (AbstractTypeHasCycleThrough(TargetTy, *I, VisitedTypes))
641 static bool ConcreteTypeHasCycleThrough(const Type *TargetTy, const Type *CurTy,
642 std::set<const Type*> &VisitedTypes) {
643 if (TargetTy == CurTy) return true;
645 if (!VisitedTypes.insert(CurTy).second)
646 return false; // Already been here.
648 for (Type::subtype_iterator I = CurTy->subtype_begin(),
649 E = CurTy->subtype_end(); I != E; ++I)
650 if (ConcreteTypeHasCycleThrough(TargetTy, *I, VisitedTypes))
655 /// TypeHasCycleThroughItself - Return true if the specified type has a cycle
657 static bool TypeHasCycleThroughItself(const Type *Ty) {
658 std::set<const Type*> VisitedTypes;
660 if (Ty->isAbstract()) { // Optimized case for abstract types.
661 for (Type::subtype_iterator I = Ty->subtype_begin(), E = Ty->subtype_end();
663 if (AbstractTypeHasCycleThrough(Ty, *I, VisitedTypes))
666 for (Type::subtype_iterator I = Ty->subtype_begin(), E = Ty->subtype_end();
668 if (ConcreteTypeHasCycleThrough(Ty, *I, VisitedTypes))
674 /// getSubElementHash - Generate a hash value for all of the SubType's of this
675 /// type. The hash value is guaranteed to be zero if any of the subtypes are
676 /// an opaque type. Otherwise we try to mix them in as well as possible, but do
677 /// not look at the subtype's subtype's.
678 static unsigned getSubElementHash(const Type *Ty) {
679 unsigned HashVal = 0;
680 for (Type::subtype_iterator I = Ty->subtype_begin(), E = Ty->subtype_end();
683 const Type *SubTy = I->get();
684 HashVal += SubTy->getTypeID();
685 switch (SubTy->getTypeID()) {
687 case Type::OpaqueTyID: return 0; // Opaque -> hash = 0 no matter what.
688 case Type::IntegerTyID:
689 HashVal ^= (cast<IntegerType>(SubTy)->getBitWidth() << 3);
691 case Type::FunctionTyID:
692 HashVal ^= cast<FunctionType>(SubTy)->getNumParams()*2 +
693 cast<FunctionType>(SubTy)->isVarArg();
695 case Type::ArrayTyID:
696 HashVal ^= cast<ArrayType>(SubTy)->getNumElements();
698 case Type::PackedTyID:
699 HashVal ^= cast<PackedType>(SubTy)->getNumElements();
701 case Type::StructTyID:
702 HashVal ^= cast<StructType>(SubTy)->getNumElements();
706 return HashVal ? HashVal : 1; // Do not return zero unless opaque subty.
709 //===----------------------------------------------------------------------===//
710 // Derived Type Factory Functions
711 //===----------------------------------------------------------------------===//
716 /// TypesByHash - Keep track of types by their structure hash value. Note
717 /// that we only keep track of types that have cycles through themselves in
720 std::multimap<unsigned, PATypeHolder> TypesByHash;
723 void RemoveFromTypesByHash(unsigned Hash, const Type *Ty) {
724 std::multimap<unsigned, PATypeHolder>::iterator I =
725 TypesByHash.lower_bound(Hash);
726 for (; I != TypesByHash.end() && I->first == Hash; ++I) {
727 if (I->second == Ty) {
728 TypesByHash.erase(I);
733 // This must be do to an opaque type that was resolved. Switch down to hash
735 assert(Hash && "Didn't find type entry!");
736 RemoveFromTypesByHash(0, Ty);
739 /// TypeBecameConcrete - When Ty gets a notification that TheType just became
740 /// concrete, drop uses and make Ty non-abstract if we should.
741 void TypeBecameConcrete(DerivedType *Ty, const DerivedType *TheType) {
742 // If the element just became concrete, remove 'ty' from the abstract
743 // type user list for the type. Do this for as many times as Ty uses
745 for (Type::subtype_iterator I = Ty->subtype_begin(), E = Ty->subtype_end();
747 if (I->get() == TheType)
748 TheType->removeAbstractTypeUser(Ty);
750 // If the type is currently thought to be abstract, rescan all of our
751 // subtypes to see if the type has just become concrete! Note that this
752 // may send out notifications to AbstractTypeUsers that types become
754 if (Ty->isAbstract())
755 Ty->PromoteAbstractToConcrete();
761 // TypeMap - Make sure that only one instance of a particular type may be
762 // created on any given run of the compiler... note that this involves updating
763 // our map if an abstract type gets refined somehow.
766 template<class ValType, class TypeClass>
767 class TypeMap : public TypeMapBase {
768 std::map<ValType, PATypeHolder> Map;
770 typedef typename std::map<ValType, PATypeHolder>::iterator iterator;
771 ~TypeMap() { print("ON EXIT"); }
773 inline TypeClass *get(const ValType &V) {
774 iterator I = Map.find(V);
775 return I != Map.end() ? cast<TypeClass>((Type*)I->second.get()) : 0;
778 inline void add(const ValType &V, TypeClass *Ty) {
779 Map.insert(std::make_pair(V, Ty));
781 // If this type has a cycle, remember it.
782 TypesByHash.insert(std::make_pair(ValType::hashTypeStructure(Ty), Ty));
786 void clear(std::vector<Type *> &DerivedTypes) {
787 for (typename std::map<ValType, PATypeHolder>::iterator I = Map.begin(),
788 E = Map.end(); I != E; ++I)
789 DerivedTypes.push_back(I->second.get());
794 /// RefineAbstractType - This method is called after we have merged a type
795 /// with another one. We must now either merge the type away with
796 /// some other type or reinstall it in the map with it's new configuration.
797 void RefineAbstractType(TypeClass *Ty, const DerivedType *OldType,
798 const Type *NewType) {
799 #ifdef DEBUG_MERGE_TYPES
800 DOUT << "RefineAbstractType(" << (void*)OldType << "[" << *OldType
801 << "], " << (void*)NewType << " [" << *NewType << "])\n";
804 // Otherwise, we are changing one subelement type into another. Clearly the
805 // OldType must have been abstract, making us abstract.
806 assert(Ty->isAbstract() && "Refining a non-abstract type!");
807 assert(OldType != NewType);
809 // Make a temporary type holder for the type so that it doesn't disappear on
810 // us when we erase the entry from the map.
811 PATypeHolder TyHolder = Ty;
813 // The old record is now out-of-date, because one of the children has been
814 // updated. Remove the obsolete entry from the map.
815 unsigned NumErased = Map.erase(ValType::get(Ty));
816 assert(NumErased && "Element not found!");
818 // Remember the structural hash for the type before we start hacking on it,
819 // in case we need it later.
820 unsigned OldTypeHash = ValType::hashTypeStructure(Ty);
822 // Find the type element we are refining... and change it now!
823 for (unsigned i = 0, e = Ty->ContainedTys.size(); i != e; ++i)
824 if (Ty->ContainedTys[i] == OldType)
825 Ty->ContainedTys[i] = NewType;
826 unsigned NewTypeHash = ValType::hashTypeStructure(Ty);
828 // If there are no cycles going through this node, we can do a simple,
829 // efficient lookup in the map, instead of an inefficient nasty linear
831 if (!TypeHasCycleThroughItself(Ty)) {
832 typename std::map<ValType, PATypeHolder>::iterator I;
835 tie(I, Inserted) = Map.insert(std::make_pair(ValType::get(Ty), Ty));
837 // Refined to a different type altogether?
838 RemoveFromTypesByHash(OldTypeHash, Ty);
840 // We already have this type in the table. Get rid of the newly refined
842 TypeClass *NewTy = cast<TypeClass>((Type*)I->second.get());
843 Ty->refineAbstractTypeTo(NewTy);
847 // Now we check to see if there is an existing entry in the table which is
848 // structurally identical to the newly refined type. If so, this type
849 // gets refined to the pre-existing type.
851 std::multimap<unsigned, PATypeHolder>::iterator I, E, Entry;
852 tie(I, E) = TypesByHash.equal_range(NewTypeHash);
854 for (; I != E; ++I) {
855 if (I->second == Ty) {
856 // Remember the position of the old type if we see it in our scan.
859 if (TypesEqual(Ty, I->second)) {
860 TypeClass *NewTy = cast<TypeClass>((Type*)I->second.get());
862 // Remove the old entry form TypesByHash. If the hash values differ
863 // now, remove it from the old place. Otherwise, continue scanning
864 // withing this hashcode to reduce work.
865 if (NewTypeHash != OldTypeHash) {
866 RemoveFromTypesByHash(OldTypeHash, Ty);
869 // Find the location of Ty in the TypesByHash structure if we
870 // haven't seen it already.
871 while (I->second != Ty) {
873 assert(I != E && "Structure doesn't contain type??");
877 TypesByHash.erase(Entry);
879 Ty->refineAbstractTypeTo(NewTy);
885 // If there is no existing type of the same structure, we reinsert an
886 // updated record into the map.
887 Map.insert(std::make_pair(ValType::get(Ty), Ty));
890 // If the hash codes differ, update TypesByHash
891 if (NewTypeHash != OldTypeHash) {
892 RemoveFromTypesByHash(OldTypeHash, Ty);
893 TypesByHash.insert(std::make_pair(NewTypeHash, Ty));
896 // If the type is currently thought to be abstract, rescan all of our
897 // subtypes to see if the type has just become concrete! Note that this
898 // may send out notifications to AbstractTypeUsers that types become
900 if (Ty->isAbstract())
901 Ty->PromoteAbstractToConcrete();
904 void print(const char *Arg) const {
905 #ifdef DEBUG_MERGE_TYPES
906 DOUT << "TypeMap<>::" << Arg << " table contents:\n";
908 for (typename std::map<ValType, PATypeHolder>::const_iterator I
909 = Map.begin(), E = Map.end(); I != E; ++I)
910 DOUT << " " << (++i) << ". " << (void*)I->second.get() << " "
911 << *I->second.get() << "\n";
915 void dump() const { print("dump output"); }
920 //===----------------------------------------------------------------------===//
921 // Function Type Factory and Value Class...
924 //===----------------------------------------------------------------------===//
925 // Integer Type Factory...
928 class IntegerValType {
931 IntegerValType(uint16_t numbits) : bits(numbits) {}
933 static IntegerValType get(const IntegerType *Ty) {
934 return IntegerValType(Ty->getBitWidth());
937 static unsigned hashTypeStructure(const IntegerType *Ty) {
938 return (unsigned)Ty->getBitWidth();
941 inline bool operator<(const IntegerValType &IVT) const {
942 return bits < IVT.bits;
947 static ManagedStatic<TypeMap<IntegerValType, IntegerType> > IntegerTypes;
949 const IntegerType *IntegerType::get(unsigned NumBits) {
950 assert(NumBits >= MIN_INT_BITS && "bitwidth too small");
951 assert(NumBits <= MAX_INT_BITS && "bitwidth too large");
953 // Check for the built-in integer types
955 case 1: return cast<IntegerType>(Type::Int1Ty);
956 case 8: return cast<IntegerType>(Type::Int8Ty);
957 case 16: return cast<IntegerType>(Type::Int16Ty);
958 case 32: return cast<IntegerType>(Type::Int32Ty);
959 case 64: return cast<IntegerType>(Type::Int64Ty);
964 IntegerValType IVT(NumBits);
965 IntegerType *ITy = IntegerTypes->get(IVT);
966 if (ITy) return ITy; // Found a match, return it!
968 // Value not found. Derive a new type!
969 ITy = new IntegerType(NumBits);
970 IntegerTypes->add(IVT, ITy);
972 #ifdef DEBUG_MERGE_TYPES
973 DOUT << "Derived new type: " << *ITy << "\n";
978 // FunctionValType - Define a class to hold the key that goes into the TypeMap
981 class FunctionValType {
983 std::vector<const Type*> ArgTypes;
984 std::vector<FunctionType::ParameterAttributes> ParamAttrs;
987 FunctionValType(const Type *ret, const std::vector<const Type*> &args,
988 bool IVA, const FunctionType::ParamAttrsList &attrs)
989 : RetTy(ret), isVarArg(IVA) {
990 for (unsigned i = 0; i < args.size(); ++i)
991 ArgTypes.push_back(args[i]);
992 for (unsigned i = 0; i < attrs.size(); ++i)
993 ParamAttrs.push_back(attrs[i]);
996 static FunctionValType get(const FunctionType *FT);
998 static unsigned hashTypeStructure(const FunctionType *FT) {
999 return FT->getNumParams()*64+FT->getNumAttrs()*2+FT->isVarArg();
1002 // Subclass should override this... to update self as usual
1003 void doRefinement(const DerivedType *OldType, const Type *NewType) {
1004 if (RetTy == OldType) RetTy = NewType;
1005 for (unsigned i = 0, e = ArgTypes.size(); i != e; ++i)
1006 if (ArgTypes[i] == OldType) ArgTypes[i] = NewType;
1009 inline bool operator<(const FunctionValType &MTV) const {
1010 if (RetTy < MTV.RetTy) return true;
1011 if (RetTy > MTV.RetTy) return false;
1012 if (isVarArg < MTV.isVarArg) return true;
1013 if (isVarArg > MTV.isVarArg) return false;
1014 if (ArgTypes < MTV.ArgTypes) return true;
1015 return ArgTypes == MTV.ArgTypes && ParamAttrs < MTV.ParamAttrs;
1020 // Define the actual map itself now...
1021 static ManagedStatic<TypeMap<FunctionValType, FunctionType> > FunctionTypes;
1023 FunctionValType FunctionValType::get(const FunctionType *FT) {
1024 // Build up a FunctionValType
1025 std::vector<const Type *> ParamTypes;
1026 std::vector<FunctionType::ParameterAttributes> ParamAttrs;
1027 ParamTypes.reserve(FT->getNumParams());
1028 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i)
1029 ParamTypes.push_back(FT->getParamType(i));
1030 for (unsigned i = 0, e = FT->getNumAttrs(); i != e; ++i)
1031 ParamAttrs.push_back(FT->getParamAttrs(i));
1032 return FunctionValType(FT->getReturnType(), ParamTypes, FT->isVarArg(),
1037 // FunctionType::get - The factory function for the FunctionType class...
1038 FunctionType *FunctionType::get(const Type *ReturnType,
1039 const std::vector<const Type*> &Params,
1041 const std::vector<ParameterAttributes> &Attrs) {
1042 bool noAttrs = true;
1043 for (unsigned i = 0, e = Attrs.size(); i < e; ++i)
1044 if (Attrs[i] != FunctionType::NoAttributeSet) {
1048 const std::vector<FunctionType::ParameterAttributes> NullAttrs;
1049 const std::vector<FunctionType::ParameterAttributes> *TheAttrs = &Attrs;
1051 TheAttrs = &NullAttrs;
1052 FunctionValType VT(ReturnType, Params, isVarArg, *TheAttrs);
1053 FunctionType *MT = FunctionTypes->get(VT);
1056 MT = new FunctionType(ReturnType, Params, isVarArg, *TheAttrs);
1057 FunctionTypes->add(VT, MT);
1059 #ifdef DEBUG_MERGE_TYPES
1060 DOUT << "Derived new type: " << MT << "\n";
1065 FunctionType::ParameterAttributes
1066 FunctionType::getParamAttrs(unsigned Idx) const {
1068 return NoAttributeSet;
1069 if (Idx >= ParamAttrs->size())
1070 return NoAttributeSet;
1071 return (*ParamAttrs)[Idx];
1074 std::string FunctionType::getParamAttrsText(ParameterAttributes Attr) {
1076 if (Attr & ZExtAttribute)
1078 if (Attr & SExtAttribute)
1080 if (Attr & NoReturnAttribute)
1081 Result += "noreturn ";
1085 //===----------------------------------------------------------------------===//
1086 // Array Type Factory...
1089 class ArrayValType {
1093 ArrayValType(const Type *val, uint64_t sz) : ValTy(val), Size(sz) {}
1095 static ArrayValType get(const ArrayType *AT) {
1096 return ArrayValType(AT->getElementType(), AT->getNumElements());
1099 static unsigned hashTypeStructure(const ArrayType *AT) {
1100 return (unsigned)AT->getNumElements();
1103 // Subclass should override this... to update self as usual
1104 void doRefinement(const DerivedType *OldType, const Type *NewType) {
1105 assert(ValTy == OldType);
1109 inline bool operator<(const ArrayValType &MTV) const {
1110 if (Size < MTV.Size) return true;
1111 return Size == MTV.Size && ValTy < MTV.ValTy;
1115 static ManagedStatic<TypeMap<ArrayValType, ArrayType> > ArrayTypes;
1118 ArrayType *ArrayType::get(const Type *ElementType, uint64_t NumElements) {
1119 assert(ElementType && "Can't get array of null types!");
1121 ArrayValType AVT(ElementType, NumElements);
1122 ArrayType *AT = ArrayTypes->get(AVT);
1123 if (AT) return AT; // Found a match, return it!
1125 // Value not found. Derive a new type!
1126 ArrayTypes->add(AVT, AT = new ArrayType(ElementType, NumElements));
1128 #ifdef DEBUG_MERGE_TYPES
1129 DOUT << "Derived new type: " << *AT << "\n";
1135 //===----------------------------------------------------------------------===//
1136 // Packed Type Factory...
1139 class PackedValType {
1143 PackedValType(const Type *val, int sz) : ValTy(val), Size(sz) {}
1145 static PackedValType get(const PackedType *PT) {
1146 return PackedValType(PT->getElementType(), PT->getNumElements());
1149 static unsigned hashTypeStructure(const PackedType *PT) {
1150 return PT->getNumElements();
1153 // Subclass should override this... to update self as usual
1154 void doRefinement(const DerivedType *OldType, const Type *NewType) {
1155 assert(ValTy == OldType);
1159 inline bool operator<(const PackedValType &MTV) const {
1160 if (Size < MTV.Size) return true;
1161 return Size == MTV.Size && ValTy < MTV.ValTy;
1165 static ManagedStatic<TypeMap<PackedValType, PackedType> > PackedTypes;
1168 PackedType *PackedType::get(const Type *ElementType, unsigned NumElements) {
1169 assert(ElementType && "Can't get packed of null types!");
1170 assert(isPowerOf2_32(NumElements) && "Vector length should be a power of 2!");
1172 PackedValType PVT(ElementType, NumElements);
1173 PackedType *PT = PackedTypes->get(PVT);
1174 if (PT) return PT; // Found a match, return it!
1176 // Value not found. Derive a new type!
1177 PackedTypes->add(PVT, PT = new PackedType(ElementType, NumElements));
1179 #ifdef DEBUG_MERGE_TYPES
1180 DOUT << "Derived new type: " << *PT << "\n";
1185 //===----------------------------------------------------------------------===//
1186 // Struct Type Factory...
1190 // StructValType - Define a class to hold the key that goes into the TypeMap
1192 class StructValType {
1193 std::vector<const Type*> ElTypes;
1196 StructValType(const std::vector<const Type*> &args, bool isPacked)
1197 : ElTypes(args), packed(isPacked) {}
1199 static StructValType get(const StructType *ST) {
1200 std::vector<const Type *> ElTypes;
1201 ElTypes.reserve(ST->getNumElements());
1202 for (unsigned i = 0, e = ST->getNumElements(); i != e; ++i)
1203 ElTypes.push_back(ST->getElementType(i));
1205 return StructValType(ElTypes, ST->isPacked());
1208 static unsigned hashTypeStructure(const StructType *ST) {
1209 return ST->getNumElements();
1212 // Subclass should override this... to update self as usual
1213 void doRefinement(const DerivedType *OldType, const Type *NewType) {
1214 for (unsigned i = 0; i < ElTypes.size(); ++i)
1215 if (ElTypes[i] == OldType) ElTypes[i] = NewType;
1218 inline bool operator<(const StructValType &STV) const {
1219 if (ElTypes < STV.ElTypes) return true;
1220 else if (ElTypes > STV.ElTypes) return false;
1221 else return (int)packed < (int)STV.packed;
1226 static ManagedStatic<TypeMap<StructValType, StructType> > StructTypes;
1228 StructType *StructType::get(const std::vector<const Type*> &ETypes,
1230 StructValType STV(ETypes, isPacked);
1231 StructType *ST = StructTypes->get(STV);
1234 // Value not found. Derive a new type!
1235 StructTypes->add(STV, ST = new StructType(ETypes, isPacked));
1237 #ifdef DEBUG_MERGE_TYPES
1238 DOUT << "Derived new type: " << *ST << "\n";
1245 //===----------------------------------------------------------------------===//
1246 // Pointer Type Factory...
1249 // PointerValType - Define a class to hold the key that goes into the TypeMap
1252 class PointerValType {
1255 PointerValType(const Type *val) : ValTy(val) {}
1257 static PointerValType get(const PointerType *PT) {
1258 return PointerValType(PT->getElementType());
1261 static unsigned hashTypeStructure(const PointerType *PT) {
1262 return getSubElementHash(PT);
1265 // Subclass should override this... to update self as usual
1266 void doRefinement(const DerivedType *OldType, const Type *NewType) {
1267 assert(ValTy == OldType);
1271 bool operator<(const PointerValType &MTV) const {
1272 return ValTy < MTV.ValTy;
1277 static ManagedStatic<TypeMap<PointerValType, PointerType> > PointerTypes;
1279 PointerType *PointerType::get(const Type *ValueType) {
1280 assert(ValueType && "Can't get a pointer to <null> type!");
1281 assert(ValueType != Type::VoidTy &&
1282 "Pointer to void is not valid, use sbyte* instead!");
1283 assert(ValueType != Type::LabelTy && "Pointer to label is not valid!");
1284 PointerValType PVT(ValueType);
1286 PointerType *PT = PointerTypes->get(PVT);
1289 // Value not found. Derive a new type!
1290 PointerTypes->add(PVT, PT = new PointerType(ValueType));
1292 #ifdef DEBUG_MERGE_TYPES
1293 DOUT << "Derived new type: " << *PT << "\n";
1298 //===----------------------------------------------------------------------===//
1299 // Derived Type Refinement Functions
1300 //===----------------------------------------------------------------------===//
1302 // removeAbstractTypeUser - Notify an abstract type that a user of the class
1303 // no longer has a handle to the type. This function is called primarily by
1304 // the PATypeHandle class. When there are no users of the abstract type, it
1305 // is annihilated, because there is no way to get a reference to it ever again.
1307 void Type::removeAbstractTypeUser(AbstractTypeUser *U) const {
1308 // Search from back to front because we will notify users from back to
1309 // front. Also, it is likely that there will be a stack like behavior to
1310 // users that register and unregister users.
1313 for (i = AbstractTypeUsers.size(); AbstractTypeUsers[i-1] != U; --i)
1314 assert(i != 0 && "AbstractTypeUser not in user list!");
1316 --i; // Convert to be in range 0 <= i < size()
1317 assert(i < AbstractTypeUsers.size() && "Index out of range!"); // Wraparound?
1319 AbstractTypeUsers.erase(AbstractTypeUsers.begin()+i);
1321 #ifdef DEBUG_MERGE_TYPES
1322 DOUT << " remAbstractTypeUser[" << (void*)this << ", "
1323 << *this << "][" << i << "] User = " << U << "\n";
1326 if (AbstractTypeUsers.empty() && getRefCount() == 0 && isAbstract()) {
1327 #ifdef DEBUG_MERGE_TYPES
1328 DOUT << "DELETEing unused abstract type: <" << *this
1329 << ">[" << (void*)this << "]" << "\n";
1331 delete this; // No users of this abstract type!
1336 // refineAbstractTypeTo - This function is used when it is discovered that
1337 // the 'this' abstract type is actually equivalent to the NewType specified.
1338 // This causes all users of 'this' to switch to reference the more concrete type
1339 // NewType and for 'this' to be deleted.
1341 void DerivedType::refineAbstractTypeTo(const Type *NewType) {
1342 assert(isAbstract() && "refineAbstractTypeTo: Current type is not abstract!");
1343 assert(this != NewType && "Can't refine to myself!");
1344 assert(ForwardType == 0 && "This type has already been refined!");
1346 // The descriptions may be out of date. Conservatively clear them all!
1347 AbstractTypeDescriptions->clear();
1349 #ifdef DEBUG_MERGE_TYPES
1350 DOUT << "REFINING abstract type [" << (void*)this << " "
1351 << *this << "] to [" << (void*)NewType << " "
1352 << *NewType << "]!\n";
1355 // Make sure to put the type to be refined to into a holder so that if IT gets
1356 // refined, that we will not continue using a dead reference...
1358 PATypeHolder NewTy(NewType);
1360 // Any PATypeHolders referring to this type will now automatically forward to
1361 // the type we are resolved to.
1362 ForwardType = NewType;
1363 if (NewType->isAbstract())
1364 cast<DerivedType>(NewType)->addRef();
1366 // Add a self use of the current type so that we don't delete ourself until
1367 // after the function exits.
1369 PATypeHolder CurrentTy(this);
1371 // To make the situation simpler, we ask the subclass to remove this type from
1372 // the type map, and to replace any type uses with uses of non-abstract types.
1373 // This dramatically limits the amount of recursive type trouble we can find
1377 // Iterate over all of the uses of this type, invoking callback. Each user
1378 // should remove itself from our use list automatically. We have to check to
1379 // make sure that NewTy doesn't _become_ 'this'. If it does, resolving types
1380 // will not cause users to drop off of the use list. If we resolve to ourself
1383 while (!AbstractTypeUsers.empty() && NewTy != this) {
1384 AbstractTypeUser *User = AbstractTypeUsers.back();
1386 unsigned OldSize = AbstractTypeUsers.size();
1387 #ifdef DEBUG_MERGE_TYPES
1388 DOUT << " REFINING user " << OldSize-1 << "[" << (void*)User
1389 << "] of abstract type [" << (void*)this << " "
1390 << *this << "] to [" << (void*)NewTy.get() << " "
1391 << *NewTy << "]!\n";
1393 User->refineAbstractType(this, NewTy);
1395 assert(AbstractTypeUsers.size() != OldSize &&
1396 "AbsTyUser did not remove self from user list!");
1399 // If we were successful removing all users from the type, 'this' will be
1400 // deleted when the last PATypeHolder is destroyed or updated from this type.
1401 // This may occur on exit of this function, as the CurrentTy object is
1405 // notifyUsesThatTypeBecameConcrete - Notify AbstractTypeUsers of this type that
1406 // the current type has transitioned from being abstract to being concrete.
1408 void DerivedType::notifyUsesThatTypeBecameConcrete() {
1409 #ifdef DEBUG_MERGE_TYPES
1410 DOUT << "typeIsREFINED type: " << (void*)this << " " << *this << "\n";
1413 unsigned OldSize = AbstractTypeUsers.size();
1414 while (!AbstractTypeUsers.empty()) {
1415 AbstractTypeUser *ATU = AbstractTypeUsers.back();
1416 ATU->typeBecameConcrete(this);
1418 assert(AbstractTypeUsers.size() < OldSize-- &&
1419 "AbstractTypeUser did not remove itself from the use list!");
1423 // refineAbstractType - Called when a contained type is found to be more
1424 // concrete - this could potentially change us from an abstract type to a
1427 void FunctionType::refineAbstractType(const DerivedType *OldType,
1428 const Type *NewType) {
1429 FunctionTypes->RefineAbstractType(this, OldType, NewType);
1432 void FunctionType::typeBecameConcrete(const DerivedType *AbsTy) {
1433 FunctionTypes->TypeBecameConcrete(this, AbsTy);
1437 // refineAbstractType - Called when a contained type is found to be more
1438 // concrete - this could potentially change us from an abstract type to a
1441 void ArrayType::refineAbstractType(const DerivedType *OldType,
1442 const Type *NewType) {
1443 ArrayTypes->RefineAbstractType(this, OldType, NewType);
1446 void ArrayType::typeBecameConcrete(const DerivedType *AbsTy) {
1447 ArrayTypes->TypeBecameConcrete(this, AbsTy);
1450 // refineAbstractType - Called when a contained type is found to be more
1451 // concrete - this could potentially change us from an abstract type to a
1454 void PackedType::refineAbstractType(const DerivedType *OldType,
1455 const Type *NewType) {
1456 PackedTypes->RefineAbstractType(this, OldType, NewType);
1459 void PackedType::typeBecameConcrete(const DerivedType *AbsTy) {
1460 PackedTypes->TypeBecameConcrete(this, AbsTy);
1463 // refineAbstractType - Called when a contained type is found to be more
1464 // concrete - this could potentially change us from an abstract type to a
1467 void StructType::refineAbstractType(const DerivedType *OldType,
1468 const Type *NewType) {
1469 StructTypes->RefineAbstractType(this, OldType, NewType);
1472 void StructType::typeBecameConcrete(const DerivedType *AbsTy) {
1473 StructTypes->TypeBecameConcrete(this, AbsTy);
1476 // refineAbstractType - Called when a contained type is found to be more
1477 // concrete - this could potentially change us from an abstract type to a
1480 void PointerType::refineAbstractType(const DerivedType *OldType,
1481 const Type *NewType) {
1482 PointerTypes->RefineAbstractType(this, OldType, NewType);
1485 void PointerType::typeBecameConcrete(const DerivedType *AbsTy) {
1486 PointerTypes->TypeBecameConcrete(this, AbsTy);
1489 bool SequentialType::indexValid(const Value *V) const {
1490 if (const IntegerType *IT = dyn_cast<IntegerType>(V->getType()))
1491 return IT->getBitWidth() == 32 || IT->getBitWidth() == 64;
1496 std::ostream &operator<<(std::ostream &OS, const Type *T) {
1498 OS << "<null> value!\n";
1504 std::ostream &operator<<(std::ostream &OS, const Type &T) {