-//===-- Constants.cpp - Implement Constant nodes -----------------*- C++ -*--=//
+//===-- 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 "llvm/SlotCalculator.h"
#include "Support/StringExtras.h"
#include <algorithm>
-using std::map;
-using std::pair;
-using std::make_pair;
-using std::vector;
-
ConstantBool *ConstantBool::True = new ConstantBool(true);
ConstantBool *ConstantBool::False = new ConstantBool(false);
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 dependant on the module that is being deleted,
+ // 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.
// 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::BoolTyID: {
+ static Constant *NullBool = ConstantBool::get(false);
+ return NullBool;
+ }
+ case Type::SByteTyID: {
+ static Constant *NullSByte = ConstantSInt::get(Type::SByteTy, 0);
+ return NullSByte;
+ }
+ case Type::UByteTyID: {
+ static Constant *NullUByte = ConstantUInt::get(Type::UByteTy, 0);
+ return NullUByte;
+ }
+ case Type::ShortTyID: {
+ static Constant *NullShort = ConstantSInt::get(Type::ShortTy, 0);
+ return NullShort;
+ }
+ case Type::UShortTyID: {
+ static Constant *NullUShort = ConstantUInt::get(Type::UShortTy, 0);
+ return NullUShort;
+ }
+ case Type::IntTyID: {
+ static Constant *NullInt = ConstantSInt::get(Type::IntTy, 0);
+ return NullInt;
+ }
+ case Type::UIntTyID: {
+ static Constant *NullUInt = ConstantUInt::get(Type::UIntTy, 0);
+ return NullUInt;
+ }
+ case Type::LongTyID: {
+ static Constant *NullLong = ConstantSInt::get(Type::LongTy, 0);
+ return NullLong;
+ }
+ case Type::ULongTyID: {
+ static Constant *NullULong = ConstantUInt::get(Type::ULongTy, 0);
+ return NullULong;
+ }
- case Type::FloatTyID:
- case Type::DoubleTyID: return ConstantFP::get(Ty, 0);
+ case Type::FloatTyID: {
+ static Constant *NullFloat = ConstantFP::get(Type::FloatTy, 0);
+ return NullFloat;
+ }
+ case Type::DoubleTyID: {
+ static Constant *NullDouble = ConstantFP::get(Type::DoubleTy, 0);
+ return NullDouble;
+ }
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;
}
}
}
}
+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
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());
+ assert(V[i]->getType() == T->getElementType() ||
+ (T->isAbstract() &&
+ V[i]->getType()->getPrimitiveID() ==
+ T->getElementType()->getPrimitiveID()));
Operands.push_back(Use(V[i], this));
}
}
"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]);
+ 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));
}
}
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(C1->getType()), iType(Opcode) {
+ : Constant(isSetCC(Opcode) ? Type::BoolTy : C1->getType()), iType(Opcode) {
Operands.push_back(Use(C1, this));
Operands.push_back(Use(C2, this));
}
// TODO: Figure out how to test if a double can be cast to a float!
case Type::FloatTyID:
- /*
- return (Val <= UINT8_MAX);
- */
case Type::DoubleTyID:
return true; // This is the largest type...
}
};
//===----------------------------------------------------------------------===//
-// Factory Function Implementation
+// 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();
+}
-template<class ValType, class ConstantClass>
-struct ValueMap {
- typedef pair<const Type*, ValType> ConstHashKey;
- map<ConstHashKey, ConstantClass *> Map;
+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);
+ }
- inline ConstantClass *get(const Type *Ty, ValType V) {
- typename map<ConstHashKey,ConstantClass *>::iterator I =
- Map.find(ConstHashKey(Ty, V));
- return (I != Map.end()) ? I->second : 0;
+ // 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!");
- inline void add(const Type *Ty, ValType V, ConstantClass *CP) {
- Map.insert(make_pair(ConstHashKey(Ty, V), CP));
+ // 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);
}
+};
- inline void remove(ConstantClass *CP) {
- for (typename map<ConstHashKey,ConstantClass *>::iterator I = Map.begin(),
- E = Map.end(); I != E;++I)
- if (I->second == CP) {
- Map.erase(I);
- return;
- }
+template<class ConstantClass, class TypeClass>
+struct ConvertConstantType {
+ static void convert(ConstantClass *OldC, const TypeClass *NewTy) {
+ assert(0 && "This type cannot be converted!\n");
+ abort();
}
};
+namespace {
+ template<class ValType, class TypeClass, class ConstantClass>
+ class ValueMap : public AbstractTypeUser {
+ typedef std::pair<const TypeClass*, ValType> MapKey;
+ typedef std::map<MapKey, ConstantClass *> MapTy;
+ typedef typename MapTy::iterator MapIterator;
+ MapTy Map;
+
+ typedef std::map<const TypeClass*, MapIterator> AbstractTypeMapTy;
+ AbstractTypeMapTy AbstractTypeMap;
+ public:
+ // getOrCreate - Return the specified constant from the map, creating it if
+ // necessary.
+ ConstantClass *getOrCreate(const TypeClass *Ty, const ValType &V) {
+ MapKey Lookup(Ty, V);
+ MapIterator 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);
+
+
+ /// FIXME: why does this assert fail when loading 176.gcc?
+ //assert(Result->getType() == Ty && "Type specified is not correct!");
+ I = Map.insert(I, std::make_pair(MapKey(Ty, V), Result));
+
+ // If the type of the constant is abstract, make sure that an entry exists
+ // for it in the AbstractTypeMap.
+ if (Ty->isAbstract()) {
+ typename AbstractTypeMapTy::iterator TI =
+ AbstractTypeMap.lower_bound(Ty);
+
+ if (TI == AbstractTypeMap.end() || TI->first != Ty) {
+ // Add ourselves to the ATU list of the type.
+ cast<DerivedType>(Ty)->addAbstractTypeUser(this);
+
+ AbstractTypeMap.insert(TI, std::make_pair(Ty, I));
+ }
+ }
+ return Result;
+ }
+
+ void remove(ConstantClass *CP) {
+ // FIXME: This should not use a linear scan. If this gets to be a
+ // performance problem, someone should look at this.
+ MapIterator I = Map.begin();
+ for (MapIterator E = Map.end(); I != E && I->second != CP; ++I)
+ /* empty */;
+
+ assert(I != Map.end() && "Constant not found in constant table!");
+
+ // Now that we found the entry, make sure this isn't the entry that
+ // the AbstractTypeMap points to.
+ const TypeClass *Ty = I->first.first;
+ if (Ty->isAbstract()) {
+ assert(AbstractTypeMap.count(Ty) &&
+ "Abstract type not in AbstractTypeMap?");
+ MapIterator &ATMEntryIt = AbstractTypeMap[Ty];
+ if (ATMEntryIt == I) {
+ // Yes, we are removing the representative entry for this type.
+ // See if there are any other entries of the same type.
+ MapIterator TmpIt = ATMEntryIt;
+
+ // First check the entry before this one...
+ if (TmpIt != Map.begin()) {
+ --TmpIt;
+ if (TmpIt->first.first != Ty) // Not the same type, move back...
+ ++TmpIt;
+ }
+
+ // If we didn't find the same type, try to move forward...
+ if (TmpIt == ATMEntryIt) {
+ ++TmpIt;
+ if (TmpIt == Map.end() || TmpIt->first.first != Ty)
+ --TmpIt; // No entry afterwards with the same type
+ }
+
+ // If there is another entry in the map of the same abstract type,
+ // update the AbstractTypeMap entry now.
+ if (TmpIt != ATMEntryIt) {
+ ATMEntryIt = TmpIt;
+ } else {
+ // Otherwise, we are removing the last instance of this type
+ // from the table. Remove from the ATM, and from user list.
+ cast<DerivedType>(Ty)->removeAbstractTypeUser(this);
+ AbstractTypeMap.erase(Ty);
+ }
+ }
+ }
+
+ Map.erase(I);
+ }
+
+ void refineAbstractType(const DerivedType *OldTy, const Type *NewTy) {
+ typename AbstractTypeMapTy::iterator I =
+ AbstractTypeMap.find(cast<TypeClass>(OldTy));
+
+ assert(I != AbstractTypeMap.end() &&
+ "Abstract type not in AbstractTypeMap?");
+
+ // Convert a constant at a time until the last one is gone. The last one
+ // leaving will remove() itself, causing the AbstractTypeMapEntry to be
+ // eliminated eventually.
+ do {
+ ConvertConstantType<ConstantClass,
+ TypeClass>::convert(I->second->second,
+ cast<TypeClass>(NewTy));
+
+ I = AbstractTypeMap.find(cast<TypeClass>(OldTy));
+ } while (I != AbstractTypeMap.end());
+ }
+
+ // If the type became concrete without being refined to any other existing
+ // type, we just remove ourselves from the ATU list.
+ void typeBecameConcrete(const DerivedType *AbsTy) {
+ AbsTy->removeAbstractTypeUser(this);
+ }
+
+ void dump() const {
+ std::cerr << "Constant.cpp: ValueMap\n";
+ }
+ };
+}
+
+
+
//---- ConstantUInt::get() and ConstantSInt::get() implementations...
//
-static ValueMap<uint64_t, ConstantInt> IntConstants;
+static ValueMap< int64_t, Type, ConstantSInt> SIntConstants;
+static ValueMap<uint64_t, Type, ConstantUInt> UIntConstants;
ConstantSInt *ConstantSInt::get(const Type *Ty, int64_t V) {
- ConstantSInt *Result = (ConstantSInt*)IntConstants.get(Ty, (uint64_t)V);
- if (!Result) // If no preexisting value, create one now...
- IntConstants.add(Ty, V, Result = new ConstantSInt(Ty, V));
- return Result;
+ return SIntConstants.getOrCreate(Ty, V);
}
ConstantUInt *ConstantUInt::get(const Type *Ty, uint64_t V) {
- ConstantUInt *Result = (ConstantUInt*)IntConstants.get(Ty, V);
- if (!Result) // If no preexisting value, create one now...
- IntConstants.add(Ty, V, Result = new ConstantUInt(Ty, V));
- return Result;
+ return UIntConstants.getOrCreate(Ty, V);
}
ConstantInt *ConstantInt::get(const Type *Ty, unsigned char V) {
//---- ConstantFP::get() implementation...
//
-static ValueMap<double, ConstantFP> FPConstants;
+static ValueMap<double, Type, ConstantFP> FPConstants;
ConstantFP *ConstantFP::get(const Type *Ty, double V) {
- ConstantFP *Result = FPConstants.get(Ty, V);
- if (!Result) // If no preexisting value, create one now...
- FPConstants.add(Ty, V, Result = new ConstantFP(Ty, V));
- return Result;
+ return FPConstants.getOrCreate(Ty, V);
}
//---- ConstantArray::get() implementation...
//
-static ValueMap<std::vector<Constant*>, ConstantArray> ArrayConstants;
+
+template<>
+struct ConvertConstantType<ConstantArray, ArrayType> {
+ static void convert(ConstantArray *OldC, const ArrayType *NewTy) {
+ // Make everyone now use a constant of the new type...
+ std::vector<Constant*> C;
+ for (unsigned i = 0, e = OldC->getNumOperands(); i != e; ++i)
+ C.push_back(cast<Constant>(OldC->getOperand(i)));
+ Constant *New = ConstantArray::get(NewTy, C);
+ assert(New != OldC && "Didn't replace constant??");
+ OldC->uncheckedReplaceAllUsesWith(New);
+ OldC->destroyConstant(); // This constant is now dead, destroy it.
+ }
+};
+
+
+static ValueMap<std::vector<Constant*>, ArrayType,
+ ConstantArray> ArrayConstants;
ConstantArray *ConstantArray::get(const ArrayType *Ty,
const std::vector<Constant*> &V) {
- ConstantArray *Result = ArrayConstants.get(Ty, V);
- if (!Result) // If no preexisting value, create one now...
- ArrayConstants.add(Ty, V, Result = new ConstantArray(Ty, V));
- return Result;
+ return ArrayConstants.getOrCreate(Ty, V);
+}
+
+// destroyConstant - Remove the constant from the constant table...
+//
+void ConstantArray::destroyConstant() {
+ ArrayConstants.remove(this);
+ destroyConstantImpl();
}
// ConstantArray::get(const string&) - Return an array that is initialized to
return ConstantArray::get(ATy, ElementVals);
}
-
-// destroyConstant - Remove the constant from the constant table...
-//
-void ConstantArray::destroyConstant() {
- ArrayConstants.remove(this);
- destroyConstantImpl();
-}
-
// 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;
- if (getType()->getElementType() == Type::SByteTy)
- for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
- Result += (char)cast<ConstantSInt>(getOperand(i))->getValue();
- else {
- assert(getType()->getElementType() == Type::UByteTy && "Not a string!");
- for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
- Result += (char)cast<ConstantUInt>(getOperand(i))->getValue();
- }
+ 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*>, ConstantStruct> StructConstants;
+
+template<>
+struct ConvertConstantType<ConstantStruct, StructType> {
+ static void convert(ConstantStruct *OldC, const StructType *NewTy) {
+ // Make everyone now use a constant of the new type...
+ std::vector<Constant*> C;
+ for (unsigned i = 0, e = OldC->getNumOperands(); i != e; ++i)
+ C.push_back(cast<Constant>(OldC->getOperand(i)));
+ Constant *New = ConstantStruct::get(NewTy, C);
+ assert(New != OldC && "Didn't replace constant??");
+
+ OldC->uncheckedReplaceAllUsesWith(New);
+ OldC->destroyConstant(); // This constant is now dead, destroy it.
+ }
+};
+
+static ValueMap<std::vector<Constant*>, StructType,
+ ConstantStruct> StructConstants;
ConstantStruct *ConstantStruct::get(const StructType *Ty,
const std::vector<Constant*> &V) {
- ConstantStruct *Result = StructConstants.get(Ty, V);
- if (!Result) // If no preexisting value, create one now...
- StructConstants.add(Ty, V, Result = new ConstantStruct(Ty, V));
- return Result;
+ return StructConstants.getOrCreate(Ty, V);
}
// destroyConstant - Remove the constant from the constant table...
destroyConstantImpl();
}
-
//---- ConstantPointerNull::get() implementation...
//
-static ValueMap<char, ConstantPointerNull> NullPtrConstants;
+
+// 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);
+ }
+};
+
+template<>
+struct ConvertConstantType<ConstantPointerNull, PointerType> {
+ static void convert(ConstantPointerNull *OldC, const PointerType *NewTy) {
+ // Make everyone now use a constant of the new type...
+ Constant *New = ConstantPointerNull::get(NewTy);
+ assert(New != OldC && "Didn't replace constant??");
+ OldC->uncheckedReplaceAllUsesWith(New);
+ OldC->destroyConstant(); // This constant is now dead, destroy it.
+ }
+};
+
+static ValueMap<char, PointerType, ConstantPointerNull> NullPtrConstants;
ConstantPointerNull *ConstantPointerNull::get(const PointerType *Ty) {
- ConstantPointerNull *Result = NullPtrConstants.get(Ty, 0);
- if (!Result) // If no preexisting value, create one now...
- NullPtrConstants.add(Ty, 0, Result = new ConstantPointerNull(Ty));
- return Result;
+ return NullPtrConstants.getOrCreate(Ty, 0);
}
// destroyConstant - Remove the constant from the constant table...
//---- ConstantExpr::get() implementations...
//
-typedef pair<unsigned, vector<Constant*> > ExprMapKeyType;
-static ValueMap<const ExprMapKeyType, ConstantExpr> ExprConstants;
+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!");
+
+ std::vector<Constant*> IdxList(V.second.begin()+1, V.second.end());
+ return new ConstantExpr(V.second[0], IdxList, Ty);
+ }
+};
+
+template<>
+struct ConvertConstantType<ConstantExpr, Type> {
+ static void convert(ConstantExpr *OldC, const Type *NewTy) {
+ Constant *New;
+ switch (OldC->getOpcode()) {
+ case Instruction::Cast:
+ New = ConstantExpr::getCast(OldC->getOperand(0), NewTy);
+ break;
+ case Instruction::Shl:
+ case Instruction::Shr:
+ New = ConstantExpr::getShiftTy(NewTy, OldC->getOpcode(),
+ OldC->getOperand(0), OldC->getOperand(1));
+ break;
+ default:
+ assert(OldC->getOpcode() >= Instruction::BinaryOpsBegin &&
+ OldC->getOpcode() < Instruction::BinaryOpsEnd);
+ New = ConstantExpr::getTy(NewTy, OldC->getOpcode(), OldC->getOperand(0),
+ OldC->getOperand(1));
+ break;
+ case Instruction::GetElementPtr:
+ // Make everyone now use a constant of the new type...
+ std::vector<Constant*> C;
+ for (unsigned i = 1, e = OldC->getNumOperands(); i != e; ++i)
+ C.push_back(cast<Constant>(OldC->getOperand(i)));
+ New = ConstantExpr::getGetElementPtrTy(NewTy, OldC->getOperand(0), C);
+ break;
+ }
+
+ assert(New != OldC && "Didn't replace constant??");
+ OldC->uncheckedReplaceAllUsesWith(New);
+ OldC->destroyConstant(); // This constant is now dead, destroy it.
+ }
+};
+
+
+static ValueMap<ExprMapKeyType, Type, ConstantExpr> ExprConstants;
+
+Constant *ConstantExpr::getCast(Constant *C, const Type *Ty) {
+ assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
-ConstantExpr *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
- vector<Constant*> argVec(1, C);
- const ExprMapKeyType &Key = make_pair(Instruction::Cast, argVec);
- ConstantExpr *Result = ExprConstants.get(Ty, Key);
- if (Result) return Result;
-
- // Its not in the table so create a new one and put it in the table.
- Result = new ConstantExpr(Instruction::Cast, C, Ty);
- ExprConstants.add(Ty, Key, Result);
- return Result;
+ std::vector<Constant*> argVec(1, C);
+ ExprMapKeyType Key = std::make_pair(Instruction::Cast, argVec);
+ return ExprConstants.getOrCreate(Ty, Key);
}
-ConstantExpr *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2) {
- // Look up the constant in the table first to ensure uniqueness
- vector<Constant*> argVec(1, C1); argVec.push_back(C2);
- const ExprMapKeyType &Key = make_pair(Opcode, argVec);
- ConstantExpr *Result = ExprConstants.get(C1->getType(), Key);
- if (Result) return Result;
-
- // Its not in the table so create a new one and put it in the table.
+Constant *ConstantExpr::getTy(const Type *ReqTy, unsigned Opcode,
+ Constant *C1, Constant *C2) {
// Check the operands for consistency first
- assert((Opcode >= Instruction::FirstBinaryOp &&
- Opcode < Instruction::NumBinaryOps) &&
+ 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");
-
- Result = new ConstantExpr(Opcode, C1, C2);
- ExprConstants.add(C1->getType(), Key, Result);
- return Result;
+
+ if (ReqTy == C1->getType())
+ 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(ReqTy, Key);
+}
+
+/// getShift - Return a shift left or shift right constant expr
+Constant *ConstantExpr::getShiftTy(const Type *ReqTy, 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(ReqTy, Key);
}
-ConstantExpr *ConstantExpr::getGetElementPtr(Constant *C,
+
+Constant *ConstantExpr::getGetElementPtrTy(const Type *ReqTy, Constant *C,
const std::vector<Constant*> &IdxList) {
- const Type *Ty = C->getType();
+ if (Constant *FC = ConstantFoldGetElementPtr(C, IdxList))
+ return FC; // Fold a few common cases...
+ assert(isa<PointerType>(C->getType()) &&
+ "Non-pointer type for constant GetElementPtr expression");
// Look up the constant in the table first to ensure uniqueness
- vector<Constant*> argVec(1, C);
+ std::vector<Constant*> argVec(1, C);
argVec.insert(argVec.end(), IdxList.begin(), IdxList.end());
-
- const ExprMapKeyType &Key = make_pair(Instruction::GetElementPtr, argVec);
- ConstantExpr *Result = ExprConstants.get(Ty, Key);
- if (Result) return Result;
+ const ExprMapKeyType &Key = std::make_pair(Instruction::GetElementPtr,argVec);
+ return ExprConstants.getOrCreate(ReqTy, Key);
+}
- // Its not in the table so create a new one and put it in the table.
- // Check the operands for consistency first
- //
- assert(isa<PointerType>(Ty) &&
- "Non-pointer type for constant GelElementPtr expression");
-
- // Check that the indices list is valid...
- std::vector<Value*> ValIdxList(IdxList.begin(), IdxList.end());
- const Type *DestTy = GetElementPtrInst::getIndexedType(Ty, ValIdxList, true);
- assert(DestTy && "Invalid index list for constant GelElementPtr expression");
-
- Result = new ConstantExpr(C, IdxList, PointerType::get(DestTy));
- ExprConstants.add(Ty, Key, Result);
- return Result;
+Constant *ConstantExpr::getGetElementPtr(Constant *C,
+ const std::vector<Constant*> &IdxList){
+ // Get the result type of the getelementptr!
+ std::vector<Value*> VIdxList(IdxList.begin(), IdxList.end());
+
+ const Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), VIdxList,
+ true);
+ assert(Ty && "GEP indices invalid!");
+ return getGetElementPtrTy(PointerType::get(Ty), C, IdxList);
}
+
// destroyConstant - Remove the constant from the constant table...
//
void ConstantExpr::destroyConstant() {
return Instruction::getOpcodeName(getOpcode());
}
-
-//---- ConstantPointerRef::mutateReferences() implementation...
-//
-unsigned ConstantPointerRef::mutateReferences(Value *OldV, Value *NewV) {
- assert(getValue() == OldV && "Cannot mutate old value if I'm not using it!");
- GlobalValue *NewGV = cast<GlobalValue>(NewV);
- getValue()->getParent()->mutateConstantPointerRef(getValue(), NewGV);
- Operands[0] = NewGV;
- return 1;
-}
-
-
-//---- ConstantPointerExpr::mutateReferences() implementation...
-//
-unsigned ConstantExpr::mutateReferences(Value* OldV, Value *NewV) {
- unsigned NumReplaced = 0;
- Constant *NewC = cast<Constant>(NewV);
- for (unsigned i = 0, N = getNumOperands(); i != N; ++i)
- if (Operands[i] == OldV) {
- ++NumReplaced;
- Operands[i] = NewC;
- }
- return NumReplaced;
+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;
+ }
}