| //===-- Constants.cpp - Implement Constant nodes --------------------------===// |
| // |
| // This file implements the Constant* classes... |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/Constants.h" |
| #include "llvm/ConstantHandling.h" |
| #include "llvm/DerivedTypes.h" |
| #include "llvm/iMemory.h" |
| #include "llvm/SymbolTable.h" |
| #include "llvm/Module.h" |
| #include "Support/StringExtras.h" |
| #include <algorithm> |
| |
| ConstantBool *ConstantBool::True = new ConstantBool(true); |
| ConstantBool *ConstantBool::False = new ConstantBool(false); |
| |
| |
| //===----------------------------------------------------------------------===// |
| // Constant Class |
| //===----------------------------------------------------------------------===// |
| |
| // Specialize setName to take care of symbol table majik |
| void Constant::setName(const std::string &Name, SymbolTable *ST) { |
| assert(ST && "Type::setName - Must provide symbol table argument!"); |
| |
| if (Name.size()) ST->insert(Name, this); |
| } |
| |
| void Constant::destroyConstantImpl() { |
| // When a Constant is destroyed, there may be lingering |
| // references to the constant by other constants in the constant pool. These |
| // constants are implicitly dependent on the module that is being deleted, |
| // but they don't know that. Because we only find out when the CPV is |
| // deleted, we must now notify all of our users (that should only be |
| // Constants) that they are, in fact, invalid now and should be deleted. |
| // |
| while (!use_empty()) { |
| Value *V = use_back(); |
| #ifndef NDEBUG // Only in -g mode... |
| if (!isa<Constant>(V)) |
| std::cerr << "While deleting: " << *this |
| << "\n\nUse still stuck around after Def is destroyed: " |
| << *V << "\n\n"; |
| #endif |
| assert(isa<Constant>(V) && "References remain to Constant being destroyed"); |
| Constant *CPV = cast<Constant>(V); |
| CPV->destroyConstant(); |
| |
| // The constant should remove itself from our use list... |
| assert((use_empty() || use_back() != V) && "Constant not removed!"); |
| } |
| |
| // Value has no outstanding references it is safe to delete it now... |
| delete this; |
| } |
| |
| // Static constructor to create a '0' constant of arbitrary type... |
| Constant *Constant::getNullValue(const Type *Ty) { |
| switch (Ty->getPrimitiveID()) { |
| case Type::BoolTyID: return ConstantBool::get(false); |
| case Type::SByteTyID: |
| case Type::ShortTyID: |
| case Type::IntTyID: |
| case Type::LongTyID: return ConstantSInt::get(Ty, 0); |
| |
| case Type::UByteTyID: |
| case Type::UShortTyID: |
| case Type::UIntTyID: |
| case Type::ULongTyID: return ConstantUInt::get(Ty, 0); |
| |
| case Type::FloatTyID: |
| case Type::DoubleTyID: return ConstantFP::get(Ty, 0); |
| |
| case Type::PointerTyID: |
| return ConstantPointerNull::get(cast<PointerType>(Ty)); |
| case Type::StructTyID: { |
| const StructType *ST = cast<StructType>(Ty); |
| |
| const StructType::ElementTypes &ETs = ST->getElementTypes(); |
| std::vector<Constant*> Elements; |
| Elements.resize(ETs.size()); |
| for (unsigned i = 0, e = ETs.size(); i != e; ++i) |
| Elements[i] = Constant::getNullValue(ETs[i]); |
| return ConstantStruct::get(ST, Elements); |
| } |
| case Type::ArrayTyID: { |
| const ArrayType *AT = cast<ArrayType>(Ty); |
| Constant *El = Constant::getNullValue(AT->getElementType()); |
| unsigned NumElements = AT->getNumElements(); |
| return ConstantArray::get(AT, std::vector<Constant*>(NumElements, El)); |
| } |
| default: |
| // Function, Type, Label, or Opaque type? |
| assert(0 && "Cannot create a null constant of that type!"); |
| return 0; |
| } |
| } |
| |
| // Static constructor to create the maximum constant of an integral type... |
| ConstantIntegral *ConstantIntegral::getMaxValue(const Type *Ty) { |
| switch (Ty->getPrimitiveID()) { |
| case Type::BoolTyID: return ConstantBool::True; |
| case Type::SByteTyID: |
| case Type::ShortTyID: |
| case Type::IntTyID: |
| case Type::LongTyID: { |
| // Calculate 011111111111111... |
| unsigned TypeBits = Ty->getPrimitiveSize()*8; |
| int64_t Val = INT64_MAX; // All ones |
| Val >>= 64-TypeBits; // Shift out unwanted 1 bits... |
| return ConstantSInt::get(Ty, Val); |
| } |
| |
| case Type::UByteTyID: |
| case Type::UShortTyID: |
| case Type::UIntTyID: |
| case Type::ULongTyID: return getAllOnesValue(Ty); |
| |
| default: return 0; |
| } |
| } |
| |
| // Static constructor to create the minimum constant for an integral type... |
| ConstantIntegral *ConstantIntegral::getMinValue(const Type *Ty) { |
| switch (Ty->getPrimitiveID()) { |
| case Type::BoolTyID: return ConstantBool::False; |
| case Type::SByteTyID: |
| case Type::ShortTyID: |
| case Type::IntTyID: |
| case Type::LongTyID: { |
| // Calculate 1111111111000000000000 |
| unsigned TypeBits = Ty->getPrimitiveSize()*8; |
| int64_t Val = -1; // All ones |
| Val <<= TypeBits-1; // Shift over to the right spot |
| return ConstantSInt::get(Ty, Val); |
| } |
| |
| case Type::UByteTyID: |
| case Type::UShortTyID: |
| case Type::UIntTyID: |
| case Type::ULongTyID: return ConstantUInt::get(Ty, 0); |
| |
| default: return 0; |
| } |
| } |
| |
| // Static constructor to create an integral constant with all bits set |
| ConstantIntegral *ConstantIntegral::getAllOnesValue(const Type *Ty) { |
| switch (Ty->getPrimitiveID()) { |
| case Type::BoolTyID: return ConstantBool::True; |
| case Type::SByteTyID: |
| case Type::ShortTyID: |
| case Type::IntTyID: |
| case Type::LongTyID: return ConstantSInt::get(Ty, -1); |
| |
| case Type::UByteTyID: |
| case Type::UShortTyID: |
| case Type::UIntTyID: |
| case Type::ULongTyID: { |
| // Calculate ~0 of the right type... |
| unsigned TypeBits = Ty->getPrimitiveSize()*8; |
| uint64_t Val = ~0ULL; // All ones |
| Val >>= 64-TypeBits; // Shift out unwanted 1 bits... |
| return ConstantUInt::get(Ty, Val); |
| } |
| default: return 0; |
| } |
| } |
| |
| bool ConstantUInt::isAllOnesValue() const { |
| unsigned TypeBits = getType()->getPrimitiveSize()*8; |
| uint64_t Val = ~0ULL; // All ones |
| Val >>= 64-TypeBits; // Shift out inappropriate bits |
| return getValue() == Val; |
| } |
| |
| |
| //===----------------------------------------------------------------------===// |
| // ConstantXXX Classes |
| //===----------------------------------------------------------------------===// |
| |
| //===----------------------------------------------------------------------===// |
| // Normal Constructors |
| |
| ConstantBool::ConstantBool(bool V) : ConstantIntegral(Type::BoolTy) { |
| Val = V; |
| } |
| |
| ConstantInt::ConstantInt(const Type *Ty, uint64_t V) : ConstantIntegral(Ty) { |
| Val.Unsigned = V; |
| } |
| |
| ConstantSInt::ConstantSInt(const Type *Ty, int64_t V) : ConstantInt(Ty, V) { |
| assert(Ty->isInteger() && Ty->isSigned() && |
| "Illegal type for unsigned integer constant!"); |
| assert(isValueValidForType(Ty, V) && "Value too large for type!"); |
| } |
| |
| ConstantUInt::ConstantUInt(const Type *Ty, uint64_t V) : ConstantInt(Ty, V) { |
| assert(Ty->isInteger() && Ty->isUnsigned() && |
| "Illegal type for unsigned integer constant!"); |
| assert(isValueValidForType(Ty, V) && "Value too large for type!"); |
| } |
| |
| ConstantFP::ConstantFP(const Type *Ty, double V) : Constant(Ty) { |
| assert(isValueValidForType(Ty, V) && "Value too large for type!"); |
| Val = V; |
| } |
| |
| ConstantArray::ConstantArray(const ArrayType *T, |
| const std::vector<Constant*> &V) : Constant(T) { |
| Operands.reserve(V.size()); |
| for (unsigned i = 0, e = V.size(); i != e; ++i) { |
| assert(V[i]->getType() == T->getElementType() || |
| (T->isAbstract() && |
| V[i]->getType()->getPrimitiveID() == |
| T->getElementType()->getPrimitiveID())); |
| Operands.push_back(Use(V[i], this)); |
| } |
| } |
| |
| ConstantStruct::ConstantStruct(const StructType *T, |
| const std::vector<Constant*> &V) : Constant(T) { |
| const StructType::ElementTypes &ETypes = T->getElementTypes(); |
| assert(V.size() == ETypes.size() && |
| "Invalid initializer vector for constant structure"); |
| Operands.reserve(V.size()); |
| for (unsigned i = 0, e = V.size(); i != e; ++i) { |
| assert((V[i]->getType() == ETypes[i] || |
| (ETypes[i]->isAbstract() && |
| ETypes[i]->getPrimitiveID()==V[i]->getType()->getPrimitiveID())) && |
| "Initializer for struct element doesn't match struct element type!"); |
| Operands.push_back(Use(V[i], this)); |
| } |
| } |
| |
| ConstantPointerRef::ConstantPointerRef(GlobalValue *GV) |
| : ConstantPointer(GV->getType()) { |
| Operands.push_back(Use(GV, this)); |
| } |
| |
| ConstantExpr::ConstantExpr(unsigned Opcode, Constant *C, const Type *Ty) |
| : Constant(Ty), iType(Opcode) { |
| Operands.push_back(Use(C, this)); |
| } |
| |
| static bool isSetCC(unsigned Opcode) { |
| return Opcode == Instruction::SetEQ || Opcode == Instruction::SetNE || |
| Opcode == Instruction::SetLT || Opcode == Instruction::SetGT || |
| Opcode == Instruction::SetLE || Opcode == Instruction::SetGE; |
| } |
| |
| ConstantExpr::ConstantExpr(unsigned Opcode, Constant *C1, Constant *C2) |
| : Constant(isSetCC(Opcode) ? Type::BoolTy : C1->getType()), iType(Opcode) { |
| Operands.push_back(Use(C1, this)); |
| Operands.push_back(Use(C2, this)); |
| } |
| |
| ConstantExpr::ConstantExpr(Constant *C, const std::vector<Constant*> &IdxList, |
| const Type *DestTy) |
| : Constant(DestTy), iType(Instruction::GetElementPtr) { |
| Operands.reserve(1+IdxList.size()); |
| Operands.push_back(Use(C, this)); |
| for (unsigned i = 0, E = IdxList.size(); i != E; ++i) |
| Operands.push_back(Use(IdxList[i], this)); |
| } |
| |
| |
| |
| //===----------------------------------------------------------------------===// |
| // classof implementations |
| |
| bool ConstantIntegral::classof(const Constant *CPV) { |
| return CPV->getType()->isIntegral() && !isa<ConstantExpr>(CPV); |
| } |
| |
| bool ConstantInt::classof(const Constant *CPV) { |
| return CPV->getType()->isInteger() && !isa<ConstantExpr>(CPV); |
| } |
| bool ConstantSInt::classof(const Constant *CPV) { |
| return CPV->getType()->isSigned() && !isa<ConstantExpr>(CPV); |
| } |
| bool ConstantUInt::classof(const Constant *CPV) { |
| return CPV->getType()->isUnsigned() && !isa<ConstantExpr>(CPV); |
| } |
| bool ConstantFP::classof(const Constant *CPV) { |
| const Type *Ty = CPV->getType(); |
| return ((Ty == Type::FloatTy || Ty == Type::DoubleTy) && |
| !isa<ConstantExpr>(CPV)); |
| } |
| bool ConstantArray::classof(const Constant *CPV) { |
| return isa<ArrayType>(CPV->getType()) && !isa<ConstantExpr>(CPV); |
| } |
| bool ConstantStruct::classof(const Constant *CPV) { |
| return isa<StructType>(CPV->getType()) && !isa<ConstantExpr>(CPV); |
| } |
| bool ConstantPointer::classof(const Constant *CPV) { |
| return (isa<PointerType>(CPV->getType()) && !isa<ConstantExpr>(CPV)); |
| } |
| |
| |
| |
| //===----------------------------------------------------------------------===// |
| // isValueValidForType implementations |
| |
| bool ConstantSInt::isValueValidForType(const Type *Ty, int64_t Val) { |
| switch (Ty->getPrimitiveID()) { |
| default: |
| return false; // These can't be represented as integers!!! |
| |
| // Signed types... |
| case Type::SByteTyID: |
| return (Val <= INT8_MAX && Val >= INT8_MIN); |
| case Type::ShortTyID: |
| return (Val <= INT16_MAX && Val >= INT16_MIN); |
| case Type::IntTyID: |
| return (Val <= INT32_MAX && Val >= INT32_MIN); |
| case Type::LongTyID: |
| return true; // This is the largest type... |
| } |
| assert(0 && "WTF?"); |
| return false; |
| } |
| |
| bool ConstantUInt::isValueValidForType(const Type *Ty, uint64_t Val) { |
| switch (Ty->getPrimitiveID()) { |
| default: |
| return false; // These can't be represented as integers!!! |
| |
| // Unsigned types... |
| case Type::UByteTyID: |
| return (Val <= UINT8_MAX); |
| case Type::UShortTyID: |
| return (Val <= UINT16_MAX); |
| case Type::UIntTyID: |
| return (Val <= UINT32_MAX); |
| case Type::ULongTyID: |
| return true; // This is the largest type... |
| } |
| assert(0 && "WTF?"); |
| return false; |
| } |
| |
| bool ConstantFP::isValueValidForType(const Type *Ty, double Val) { |
| switch (Ty->getPrimitiveID()) { |
| default: |
| return false; // These can't be represented as floating point! |
| |
| // TODO: Figure out how to test if a double can be cast to a float! |
| case Type::FloatTyID: |
| case Type::DoubleTyID: |
| return true; // This is the largest type... |
| } |
| }; |
| |
| //===----------------------------------------------------------------------===// |
| // replaceUsesOfWithOnConstant implementations |
| |
| void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To, |
| bool DisableChecking) { |
| assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!"); |
| |
| std::vector<Constant*> Values; |
| Values.reserve(getValues().size()); // Build replacement array... |
| for (unsigned i = 0, e = getValues().size(); i != e; ++i) { |
| Constant *Val = cast<Constant>(getValues()[i]); |
| if (Val == From) Val = cast<Constant>(To); |
| Values.push_back(Val); |
| } |
| |
| ConstantArray *Replacement = ConstantArray::get(getType(), Values); |
| assert(Replacement != this && "I didn't contain From!"); |
| |
| // Everyone using this now uses the replacement... |
| if (DisableChecking) |
| uncheckedReplaceAllUsesWith(Replacement); |
| else |
| replaceAllUsesWith(Replacement); |
| |
| // Delete the old constant! |
| destroyConstant(); |
| } |
| |
| void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To, |
| bool DisableChecking) { |
| assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!"); |
| |
| std::vector<Constant*> Values; |
| Values.reserve(getValues().size()); |
| for (unsigned i = 0, e = getValues().size(); i != e; ++i) { |
| Constant *Val = cast<Constant>(getValues()[i]); |
| if (Val == From) Val = cast<Constant>(To); |
| Values.push_back(Val); |
| } |
| |
| ConstantStruct *Replacement = ConstantStruct::get(getType(), Values); |
| assert(Replacement != this && "I didn't contain From!"); |
| |
| // Everyone using this now uses the replacement... |
| if (DisableChecking) |
| uncheckedReplaceAllUsesWith(Replacement); |
| else |
| replaceAllUsesWith(Replacement); |
| |
| // Delete the old constant! |
| destroyConstant(); |
| } |
| |
| void ConstantPointerRef::replaceUsesOfWithOnConstant(Value *From, Value *To, |
| bool DisableChecking) { |
| if (isa<GlobalValue>(To)) { |
| assert(From == getOperand(0) && "Doesn't contain from!"); |
| ConstantPointerRef *Replacement = |
| ConstantPointerRef::get(cast<GlobalValue>(To)); |
| |
| // Everyone using this now uses the replacement... |
| if (DisableChecking) |
| uncheckedReplaceAllUsesWith(Replacement); |
| else |
| replaceAllUsesWith(Replacement); |
| |
| } else { |
| // Just replace ourselves with the To value specified. |
| if (DisableChecking) |
| uncheckedReplaceAllUsesWith(To); |
| else |
| replaceAllUsesWith(To); |
| } |
| |
| // Delete the old constant! |
| destroyConstant(); |
| } |
| |
| void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV, |
| bool DisableChecking) { |
| assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!"); |
| Constant *To = cast<Constant>(ToV); |
| |
| Constant *Replacement = 0; |
| if (getOpcode() == Instruction::GetElementPtr) { |
| std::vector<Constant*> Indices; |
| Constant *Pointer = getOperand(0); |
| Indices.reserve(getNumOperands()-1); |
| if (Pointer == From) Pointer = To; |
| |
| for (unsigned i = 1, e = getNumOperands(); i != e; ++i) { |
| Constant *Val = getOperand(i); |
| if (Val == From) Val = To; |
| Indices.push_back(Val); |
| } |
| Replacement = ConstantExpr::getGetElementPtr(Pointer, Indices); |
| } else if (getOpcode() == Instruction::Cast) { |
| assert(getOperand(0) == From && "Cast only has one use!"); |
| Replacement = ConstantExpr::getCast(To, getType()); |
| } else if (getNumOperands() == 2) { |
| Constant *C1 = getOperand(0); |
| Constant *C2 = getOperand(1); |
| if (C1 == From) C1 = To; |
| if (C2 == From) C2 = To; |
| Replacement = ConstantExpr::get(getOpcode(), C1, C2); |
| } else { |
| assert(0 && "Unknown ConstantExpr type!"); |
| return; |
| } |
| |
| assert(Replacement != this && "I didn't contain From!"); |
| |
| // Everyone using this now uses the replacement... |
| if (DisableChecking) |
| uncheckedReplaceAllUsesWith(Replacement); |
| else |
| replaceAllUsesWith(Replacement); |
| |
| // Delete the old constant! |
| destroyConstant(); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Factory Function Implementation |
| |
| // ConstantCreator - A class that is used to create constants by |
| // ValueMap*. This class should be partially specialized if there is |
| // something strange that needs to be done to interface to the ctor for the |
| // constant. |
| // |
| template<class ConstantClass, class TypeClass, class ValType> |
| struct ConstantCreator { |
| static ConstantClass *create(const TypeClass *Ty, const ValType &V) { |
| return new ConstantClass(Ty, V); |
| } |
| }; |
| |
| namespace { |
| template<class ValType, class TypeClass, class ConstantClass> |
| class ValueMap { |
| protected: |
| typedef std::pair<const TypeClass*, ValType> ConstHashKey; |
| std::map<ConstHashKey, ConstantClass *> Map; |
| public: |
| // getOrCreate - Return the specified constant from the map, creating it if |
| // necessary. |
| ConstantClass *getOrCreate(const TypeClass *Ty, const ValType &V) { |
| ConstHashKey Lookup(Ty, V); |
| typename std::map<ConstHashKey,ConstantClass *>::iterator I = |
| Map.lower_bound(Lookup); |
| if (I != Map.end() && I->first == Lookup) |
| return I->second; // Is it in the map? |
| |
| // If no preexisting value, create one now... |
| ConstantClass *Result = |
| ConstantCreator<ConstantClass,TypeClass,ValType>::create(Ty, V); |
| |
| Map.insert(I, std::make_pair(ConstHashKey(Ty, V), Result)); |
| return Result; |
| } |
| |
| void remove(ConstantClass *CP) { |
| // FIXME: This could be sped up a LOT. If this gets to be a performance |
| // problem, someone should look at this. |
| for (typename std::map<ConstHashKey, ConstantClass*>::iterator |
| I = Map.begin(), E = Map.end(); I != E; ++I) |
| if (I->second == CP) { |
| Map.erase(I); |
| return; |
| } |
| assert(0 && "Constant not found in constant table!"); |
| } |
| }; |
| } |
| |
| |
| |
| //---- ConstantUInt::get() and ConstantSInt::get() implementations... |
| // |
| static ValueMap< int64_t, Type, ConstantSInt> SIntConstants; |
| static ValueMap<uint64_t, Type, ConstantUInt> UIntConstants; |
| |
| ConstantSInt *ConstantSInt::get(const Type *Ty, int64_t V) { |
| return SIntConstants.getOrCreate(Ty, V); |
| } |
| |
| ConstantUInt *ConstantUInt::get(const Type *Ty, uint64_t V) { |
| return UIntConstants.getOrCreate(Ty, V); |
| } |
| |
| ConstantInt *ConstantInt::get(const Type *Ty, unsigned char V) { |
| assert(V <= 127 && "Can only be used with very small positive constants!"); |
| if (Ty->isSigned()) return ConstantSInt::get(Ty, V); |
| return ConstantUInt::get(Ty, V); |
| } |
| |
| //---- ConstantFP::get() implementation... |
| // |
| static ValueMap<double, Type, ConstantFP> FPConstants; |
| |
| ConstantFP *ConstantFP::get(const Type *Ty, double V) { |
| return FPConstants.getOrCreate(Ty, V); |
| } |
| |
| //---- ConstantArray::get() implementation... |
| // |
| static ValueMap<std::vector<Constant*>, ArrayType, |
| ConstantArray> ArrayConstants; |
| |
| ConstantArray *ConstantArray::get(const ArrayType *Ty, |
| const std::vector<Constant*> &V) { |
| return ArrayConstants.getOrCreate(Ty, V); |
| } |
| |
| // destroyConstant - Remove the constant from the constant table... |
| // |
| void ConstantArray::destroyConstant() { |
| ArrayConstants.remove(this); |
| destroyConstantImpl(); |
| } |
| |
| /// refineAbstractType - If this callback is invoked, then this constant is of a |
| /// derived type, change all users to use a concrete constant of the new type. |
| /// |
| void ConstantArray::refineAbstractType(const DerivedType *OldTy, |
| const Type *NewTy) { |
| Value::refineAbstractType(OldTy, NewTy); |
| if (OldTy == NewTy) return; |
| |
| // Make everyone now use a constant of the new type... |
| std::vector<Constant*> C; |
| for (unsigned i = 0, e = getNumOperands(); i != e; ++i) |
| C.push_back(cast<Constant>(getOperand(i))); |
| Constant *New = ConstantArray::get(cast<ArrayType>(NewTy), C); |
| if (New != this) { |
| uncheckedReplaceAllUsesWith(New); |
| destroyConstant(); // This constant is now dead, destroy it. |
| } |
| } |
| |
| |
| // ConstantArray::get(const string&) - Return an array that is initialized to |
| // contain the specified string. A null terminator is added to the specified |
| // string so that it may be used in a natural way... |
| // |
| ConstantArray *ConstantArray::get(const std::string &Str) { |
| std::vector<Constant*> ElementVals; |
| |
| for (unsigned i = 0; i < Str.length(); ++i) |
| ElementVals.push_back(ConstantSInt::get(Type::SByteTy, Str[i])); |
| |
| // Add a null terminator to the string... |
| ElementVals.push_back(ConstantSInt::get(Type::SByteTy, 0)); |
| |
| ArrayType *ATy = ArrayType::get(Type::SByteTy, Str.length()+1); |
| return ConstantArray::get(ATy, ElementVals); |
| } |
| |
| // getAsString - If the sub-element type of this array is either sbyte or ubyte, |
| // then this method converts the array to an std::string and returns it. |
| // Otherwise, it asserts out. |
| // |
| std::string ConstantArray::getAsString() const { |
| assert((getType()->getElementType() == Type::UByteTy || |
| getType()->getElementType() == Type::SByteTy) && "Not a string!"); |
| |
| std::string Result; |
| for (unsigned i = 0, e = getNumOperands(); i != e; ++i) |
| Result += (char)cast<ConstantInt>(getOperand(i))->getRawValue(); |
| return Result; |
| } |
| |
| |
| //---- ConstantStruct::get() implementation... |
| // |
| static ValueMap<std::vector<Constant*>, StructType, |
| ConstantStruct> StructConstants; |
| |
| ConstantStruct *ConstantStruct::get(const StructType *Ty, |
| const std::vector<Constant*> &V) { |
| return StructConstants.getOrCreate(Ty, V); |
| } |
| |
| // destroyConstant - Remove the constant from the constant table... |
| // |
| void ConstantStruct::destroyConstant() { |
| StructConstants.remove(this); |
| destroyConstantImpl(); |
| } |
| |
| /// refineAbstractType - If this callback is invoked, then this constant is of a |
| /// derived type, change all users to use a concrete constant of the new type. |
| /// |
| void ConstantStruct::refineAbstractType(const DerivedType *OldTy, |
| const Type *NewTy) { |
| Value::refineAbstractType(OldTy, NewTy); |
| if (OldTy == NewTy) return; |
| |
| // Make everyone now use a constant of the new type... |
| std::vector<Constant*> C; |
| for (unsigned i = 0, e = getNumOperands(); i != e; ++i) |
| C.push_back(cast<Constant>(getOperand(i))); |
| Constant *New = ConstantStruct::get(cast<StructType>(NewTy), C); |
| if (New != this) { |
| uncheckedReplaceAllUsesWith(New); |
| destroyConstant(); // This constant is now dead, destroy it. |
| } |
| } |
| |
| |
| //---- ConstantPointerNull::get() implementation... |
| // |
| |
| // ConstantPointerNull does not take extra "value" argument... |
| template<class ValType> |
| struct ConstantCreator<ConstantPointerNull, PointerType, ValType> { |
| static ConstantPointerNull *create(const PointerType *Ty, const ValType &V){ |
| return new ConstantPointerNull(Ty); |
| } |
| }; |
| |
| static ValueMap<char, PointerType, ConstantPointerNull> NullPtrConstants; |
| |
| ConstantPointerNull *ConstantPointerNull::get(const PointerType *Ty) { |
| return NullPtrConstants.getOrCreate(Ty, 0); |
| } |
| |
| // destroyConstant - Remove the constant from the constant table... |
| // |
| void ConstantPointerNull::destroyConstant() { |
| NullPtrConstants.remove(this); |
| destroyConstantImpl(); |
| } |
| |
| /// refineAbstractType - If this callback is invoked, then this constant is of a |
| /// derived type, change all users to use a concrete constant of the new type. |
| /// |
| void ConstantPointerNull::refineAbstractType(const DerivedType *OldTy, |
| const Type *NewTy) { |
| Value::refineAbstractType(OldTy, NewTy); |
| if (OldTy == NewTy) return; |
| |
| // Make everyone now use a constant of the new type... |
| Constant *New = ConstantPointerNull::get(cast<PointerType>(NewTy)); |
| if (New != this) { |
| uncheckedReplaceAllUsesWith(New); |
| |
| // This constant is now dead, destroy it. |
| destroyConstant(); |
| } |
| } |
| |
| |
| |
| //---- ConstantPointerRef::get() implementation... |
| // |
| ConstantPointerRef *ConstantPointerRef::get(GlobalValue *GV) { |
| assert(GV->getParent() && "Global Value must be attached to a module!"); |
| |
| // The Module handles the pointer reference sharing... |
| return GV->getParent()->getConstantPointerRef(GV); |
| } |
| |
| // destroyConstant - Remove the constant from the constant table... |
| // |
| void ConstantPointerRef::destroyConstant() { |
| getValue()->getParent()->destroyConstantPointerRef(this); |
| destroyConstantImpl(); |
| } |
| |
| |
| //---- ConstantExpr::get() implementations... |
| // |
| typedef std::pair<unsigned, std::vector<Constant*> > ExprMapKeyType; |
| |
| template<> |
| struct ConstantCreator<ConstantExpr, Type, ExprMapKeyType> { |
| static ConstantExpr *create(const Type *Ty, const ExprMapKeyType &V) { |
| if (V.first == Instruction::Cast) |
| return new ConstantExpr(Instruction::Cast, V.second[0], Ty); |
| if ((V.first >= Instruction::BinaryOpsBegin && |
| V.first < Instruction::BinaryOpsEnd) || |
| V.first == Instruction::Shl || V.first == Instruction::Shr) |
| return new ConstantExpr(V.first, V.second[0], V.second[1]); |
| |
| assert(V.first == Instruction::GetElementPtr && "Invalid ConstantExpr!"); |
| |
| // Check that the indices list is valid... |
| std::vector<Value*> ValIdxList(V.second.begin()+1, V.second.end()); |
| const Type *DestTy = GetElementPtrInst::getIndexedType(Ty, ValIdxList, |
| true); |
| assert(DestTy && "Invalid index list for GetElementPtr expression"); |
| |
| std::vector<Constant*> IdxList(V.second.begin()+1, V.second.end()); |
| return new ConstantExpr(V.second[0], IdxList, PointerType::get(DestTy)); |
| } |
| }; |
| |
| static ValueMap<ExprMapKeyType, Type, ConstantExpr> ExprConstants; |
| |
| Constant *ConstantExpr::getCast(Constant *C, const Type *Ty) { |
| if (Constant *FC = ConstantFoldCastInstruction(C, Ty)) |
| return FC; // Fold a few common cases... |
| |
| // Look up the constant in the table first to ensure uniqueness |
| std::vector<Constant*> argVec(1, C); |
| ExprMapKeyType Key = std::make_pair(Instruction::Cast, argVec); |
| return ExprConstants.getOrCreate(Ty, Key); |
| } |
| |
| Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2) { |
| // Check the operands for consistency first |
| assert((Opcode >= Instruction::BinaryOpsBegin && |
| Opcode < Instruction::BinaryOpsEnd) && |
| "Invalid opcode in binary constant expression"); |
| assert(C1->getType() == C2->getType() && |
| "Operand types in binary constant expression should match"); |
| |
| if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2)) |
| return FC; // Fold a few common cases... |
| |
| std::vector<Constant*> argVec(1, C1); argVec.push_back(C2); |
| ExprMapKeyType Key = std::make_pair(Opcode, argVec); |
| return ExprConstants.getOrCreate(C1->getType(), Key); |
| } |
| |
| /// getShift - Return a shift left or shift right constant expr |
| Constant *ConstantExpr::getShift(unsigned Opcode, Constant *C1, Constant *C2) { |
| // Check the operands for consistency first |
| assert((Opcode == Instruction::Shl || |
| Opcode == Instruction::Shr) && |
| "Invalid opcode in binary constant expression"); |
| assert(C1->getType()->isIntegral() && C2->getType() == Type::UByteTy && |
| "Invalid operand types for Shift constant expr!"); |
| |
| if (Constant *FC = ConstantFoldShiftInstruction(Opcode, C1, C2)) |
| return FC; // Fold a few common cases... |
| |
| // Look up the constant in the table first to ensure uniqueness |
| std::vector<Constant*> argVec(1, C1); argVec.push_back(C2); |
| ExprMapKeyType Key = std::make_pair(Opcode, argVec); |
| return ExprConstants.getOrCreate(C1->getType(), Key); |
| } |
| |
| |
| Constant *ConstantExpr::getGetElementPtr(Constant *C, |
| const std::vector<Constant*> &IdxList){ |
| if (Constant *FC = ConstantFoldGetElementPtr(C, IdxList)) |
| return FC; // Fold a few common cases... |
| const Type *Ty = C->getType(); |
| assert(isa<PointerType>(Ty) && |
| "Non-pointer type for constant GetElementPtr expression"); |
| |
| // Look up the constant in the table first to ensure uniqueness |
| std::vector<Constant*> argVec(1, C); |
| argVec.insert(argVec.end(), IdxList.begin(), IdxList.end()); |
| |
| const ExprMapKeyType &Key = std::make_pair(Instruction::GetElementPtr,argVec); |
| return ExprConstants.getOrCreate(Ty, Key); |
| } |
| |
| // destroyConstant - Remove the constant from the constant table... |
| // |
| void ConstantExpr::destroyConstant() { |
| ExprConstants.remove(this); |
| destroyConstantImpl(); |
| } |
| |
| /// refineAbstractType - If this callback is invoked, then this constant is of a |
| /// derived type, change all users to use a concrete constant of the new type. |
| /// |
| void ConstantExpr::refineAbstractType(const DerivedType *OldTy, |
| const Type *NewTy) { |
| Value::refineAbstractType(OldTy, NewTy); |
| if (OldTy == NewTy) return; |
| |
| // FIXME: These need to use a lower-level implementation method, because the |
| // ::get methods intuit the type of the result based on the types of the |
| // operands. The operand types may not have had their types resolved yet. |
| // |
| Constant *New; |
| if (getOpcode() == Instruction::Cast) { |
| New = getCast(getOperand(0), NewTy); |
| } else if (getOpcode() >= Instruction::BinaryOpsBegin && |
| getOpcode() < Instruction::BinaryOpsEnd) { |
| New = get(getOpcode(), getOperand(0), getOperand(0)); |
| } else if (getOpcode() == Instruction::Shl || getOpcode() ==Instruction::Shr){ |
| New = getShift(getOpcode(), getOperand(0), getOperand(0)); |
| } else { |
| assert(getOpcode() == Instruction::GetElementPtr); |
| |
| // Make everyone now use a constant of the new type... |
| std::vector<Constant*> C; |
| for (unsigned i = 1, e = getNumOperands(); i != e; ++i) |
| C.push_back(cast<Constant>(getOperand(i))); |
| New = ConstantExpr::getGetElementPtr(getOperand(0), C); |
| } |
| if (New != this) { |
| uncheckedReplaceAllUsesWith(New); |
| destroyConstant(); // This constant is now dead, destroy it. |
| } |
| } |
| |
| |
| |
| |
| const char *ConstantExpr::getOpcodeName() const { |
| return Instruction::getOpcodeName(getOpcode()); |
| } |
| |
| unsigned Constant::mutateReferences(Value *OldV, Value *NewV) { |
| // Uses of constant pointer refs are global values, not constants! |
| if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(this)) { |
| GlobalValue *NewGV = cast<GlobalValue>(NewV); |
| GlobalValue *OldGV = CPR->getValue(); |
| |
| assert(OldGV == OldV && "Cannot mutate old value if I'm not using it!"); |
| Operands[0] = NewGV; |
| OldGV->getParent()->mutateConstantPointerRef(OldGV, NewGV); |
| return 1; |
| } else { |
| Constant *NewC = cast<Constant>(NewV); |
| unsigned NumReplaced = 0; |
| for (unsigned i = 0, N = getNumOperands(); i != N; ++i) |
| if (Operands[i] == OldV) { |
| ++NumReplaced; |
| Operands[i] = NewC; |
| } |
| return NumReplaced; |
| } |
| } |