namespace llvm {
+class GetElementPtrInst;
+class BinaryOperator;
+class ConstantExpr;
+
/// Operator - This is a utility class that provides an abstraction for the
/// common functionality between Instructions and ConstantExprs.
///
}
static inline bool classof(const Operator *) { return true; }
- static inline bool classof(const Instruction *I) { return true; }
- static inline bool classof(const ConstantExpr *I) { return true; }
+ static inline bool classof(const Instruction *) { return true; }
+ static inline bool classof(const ConstantExpr *) { return true; }
static inline bool classof(const Value *V) {
return isa<Instruction>(V) || isa<ConstantExpr>(V);
}
///
class OverflowingBinaryOperator : public Operator {
public:
- /// hasNoSignedOverflow - Test whether this operation is known to never
- /// undergo signed overflow.
- bool hasNoSignedOverflow() const {
- return SubclassOptionalData & (1 << 0);
+ enum {
+ NoUnsignedWrap = (1 << 0),
+ NoSignedWrap = (1 << 1)
+ };
+
+private:
+ ~OverflowingBinaryOperator(); // do not implement
+
+ friend class BinaryOperator;
+ friend class ConstantExpr;
+ void setHasNoUnsignedWrap(bool B) {
+ SubclassOptionalData =
+ (SubclassOptionalData & ~NoUnsignedWrap) | (B * NoUnsignedWrap);
}
- void setHasNoSignedOverflow(bool B) {
- SubclassOptionalData = (SubclassOptionalData & ~(1 << 0)) | (B << 0);
+ void setHasNoSignedWrap(bool B) {
+ SubclassOptionalData =
+ (SubclassOptionalData & ~NoSignedWrap) | (B * NoSignedWrap);
}
- /// hasNoUnsignedOverflow - Test whether this operation is known to never
- /// undergo unsigned overflow.
- bool hasNoUnsignedOverflow() const {
- return SubclassOptionalData & (1 << 1);
+public:
+ /// hasNoUnsignedWrap - Test whether this operation is known to never
+ /// undergo unsigned overflow, aka the nuw property.
+ bool hasNoUnsignedWrap() const {
+ return SubclassOptionalData & NoUnsignedWrap;
}
- void setHasNoUnsignedOverflow(bool B) {
- SubclassOptionalData = (SubclassOptionalData & ~(1 << 1)) | (B << 1);
+
+ /// hasNoSignedWrap - Test whether this operation is known to never
+ /// undergo signed overflow, aka the nsw property.
+ bool hasNoSignedWrap() const {
+ return (SubclassOptionalData & NoSignedWrap) != 0;
}
static inline bool classof(const OverflowingBinaryOperator *) { return true; }
static inline bool classof(const Instruction *I) {
return I->getOpcode() == Instruction::Add ||
I->getOpcode() == Instruction::Sub ||
- I->getOpcode() == Instruction::Mul;
+ I->getOpcode() == Instruction::Mul ||
+ I->getOpcode() == Instruction::Shl;
}
static inline bool classof(const ConstantExpr *CE) {
return CE->getOpcode() == Instruction::Add ||
CE->getOpcode() == Instruction::Sub ||
- CE->getOpcode() == Instruction::Mul;
+ CE->getOpcode() == Instruction::Mul ||
+ CE->getOpcode() == Instruction::Shl;
}
static inline bool classof(const Value *V) {
return (isa<Instruction>(V) && classof(cast<Instruction>(V))) ||
}
};
-/// SDivOperator - An Operator with opcode Instruction::SDiv.
-///
-class SDivOperator : public Operator {
+/// PossiblyExactOperator - A udiv or sdiv instruction, which can be marked as
+/// "exact", indicating that no bits are destroyed.
+class PossiblyExactOperator : public Operator {
+public:
+ enum {
+ IsExact = (1 << 0)
+ };
+
+ friend class BinaryOperator;
+ friend class ConstantExpr;
+ void setIsExact(bool B) {
+ SubclassOptionalData = (SubclassOptionalData & ~IsExact) | (B * IsExact);
+ }
+
+private:
+ ~PossiblyExactOperator(); // do not implement
public:
/// isExact - Test whether this division is known to be exact, with
/// zero remainder.
bool isExact() const {
- return SubclassOptionalData & (1 << 0);
+ return SubclassOptionalData & IsExact;
}
- void setIsExact(bool B) {
- SubclassOptionalData = (SubclassOptionalData & ~(1 << 0)) | (B << 0);
+
+ static bool isPossiblyExactOpcode(unsigned OpC) {
+ return OpC == Instruction::SDiv ||
+ OpC == Instruction::UDiv ||
+ OpC == Instruction::AShr ||
+ OpC == Instruction::LShr;
}
-
- // Methods for support type inquiry through isa, cast, and dyn_cast:
- static inline bool classof(const SDivOperator *) { return true; }
static inline bool classof(const ConstantExpr *CE) {
- return CE->getOpcode() == Instruction::SDiv;
+ return isPossiblyExactOpcode(CE->getOpcode());
}
static inline bool classof(const Instruction *I) {
- return I->getOpcode() == Instruction::SDiv;
+ return isPossiblyExactOpcode(I->getOpcode());
+ }
+ static inline bool classof(const Value *V) {
+ return (isa<Instruction>(V) && classof(cast<Instruction>(V))) ||
+ (isa<ConstantExpr>(V) && classof(cast<ConstantExpr>(V)));
+ }
+};
+
+
+
+/// ConcreteOperator - A helper template for defining operators for individual
+/// opcodes.
+template<typename SuperClass, unsigned Opc>
+class ConcreteOperator : public SuperClass {
+ ~ConcreteOperator(); // DO NOT IMPLEMENT
+public:
+ static inline bool classof(const ConcreteOperator<SuperClass, Opc> *) {
+ return true;
+ }
+ static inline bool classof(const Instruction *I) {
+ return I->getOpcode() == Opc;
+ }
+ static inline bool classof(const ConstantExpr *CE) {
+ return CE->getOpcode() == Opc;
}
static inline bool classof(const Value *V) {
return (isa<Instruction>(V) && classof(cast<Instruction>(V))) ||
}
};
-class GEPOperator : public Operator {
+class AddOperator
+ : public ConcreteOperator<OverflowingBinaryOperator, Instruction::Add> {
+ ~AddOperator(); // DO NOT IMPLEMENT
+};
+class SubOperator
+ : public ConcreteOperator<OverflowingBinaryOperator, Instruction::Sub> {
+ ~SubOperator(); // DO NOT IMPLEMENT
+};
+class MulOperator
+ : public ConcreteOperator<OverflowingBinaryOperator, Instruction::Mul> {
+ ~MulOperator(); // DO NOT IMPLEMENT
+};
+class ShlOperator
+ : public ConcreteOperator<OverflowingBinaryOperator, Instruction::Shl> {
+ ~ShlOperator(); // DO NOT IMPLEMENT
+};
+
+
+class SDivOperator
+ : public ConcreteOperator<PossiblyExactOperator, Instruction::SDiv> {
+ ~SDivOperator(); // DO NOT IMPLEMENT
+};
+class UDivOperator
+ : public ConcreteOperator<PossiblyExactOperator, Instruction::UDiv> {
+ ~UDivOperator(); // DO NOT IMPLEMENT
+};
+class AShrOperator
+ : public ConcreteOperator<PossiblyExactOperator, Instruction::AShr> {
+ ~AShrOperator(); // DO NOT IMPLEMENT
+};
+class LShrOperator
+ : public ConcreteOperator<PossiblyExactOperator, Instruction::LShr> {
+ ~LShrOperator(); // DO NOT IMPLEMENT
+};
+
+
+
+class GEPOperator
+ : public ConcreteOperator<Operator, Instruction::GetElementPtr> {
+ ~GEPOperator(); // DO NOT IMPLEMENT
+
+ enum {
+ IsInBounds = (1 << 0)
+ };
+
+ friend class GetElementPtrInst;
+ friend class ConstantExpr;
+ void setIsInBounds(bool B) {
+ SubclassOptionalData =
+ (SubclassOptionalData & ~IsInBounds) | (B * IsInBounds);
+ }
+
public:
+ /// isInBounds - Test whether this is an inbounds GEP, as defined
+ /// by LangRef.html.
+ bool isInBounds() const {
+ return SubclassOptionalData & IsInBounds;
+ }
+
inline op_iterator idx_begin() { return op_begin()+1; }
inline const_op_iterator idx_begin() const { return op_begin()+1; }
inline op_iterator idx_end() { return op_end(); }
/// getPointerOperandType - Method to return the pointer operand as a
/// PointerType.
- const PointerType *getPointerOperandType() const {
- return reinterpret_cast<const PointerType*>(getPointerOperand()->getType());
+ PointerType *getPointerOperandType() const {
+ return reinterpret_cast<PointerType*>(getPointerOperand()->getType());
}
unsigned getNumIndices() const { // Note: always non-negative
/// value, just potentially different types.
bool hasAllZeroIndices() const {
for (const_op_iterator I = idx_begin(), E = idx_end(); I != E; ++I) {
- if (Constant *C = dyn_cast<Constant>(I))
- if (C->isNullValue())
+ if (ConstantInt *C = dyn_cast<ConstantInt>(I))
+ if (C->isZero())
continue;
return false;
}
return true;
}
- // Methods for support type inquiry through isa, cast, and dyn_cast:
- static inline bool classof(const GEPOperator *) { return true; }
- static inline bool classof(const GetElementPtrInst *) { return true; }
- static inline bool classof(const ConstantExpr *CE) {
- return CE->getOpcode() == Instruction::GetElementPtr;
- }
- static inline bool classof(const Instruction *I) {
- return I->getOpcode() == Instruction::GetElementPtr;
- }
- static inline bool classof(const Value *V) {
- return isa<GetElementPtrInst>(V) ||
- (isa<ConstantExpr>(V) && classof(cast<ConstantExpr>(V)));
+ /// hasAllConstantIndices - Return true if all of the indices of this GEP are
+ /// constant integers. If so, the result pointer and the first operand have
+ /// a constant offset between them.
+ bool hasAllConstantIndices() const {
+ for (const_op_iterator I = idx_begin(), E = idx_end(); I != E; ++I) {
+ if (!isa<ConstantInt>(I))
+ return false;
+ }
+ return true;
}
};
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