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Added subclass ConstantExpr to represent expressions consructed from

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constants using operators such as cast, getelementptr, add, shl, etc.
Note that a ConstantExpr can be of any type, so classof() in most
other subclasses (that discriminate by type) have to check that it
is also not a ConstantExpr.   This is why isConstantExpr() is needed.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2891 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Vikram S. Adve 2002-07-14 22:47:54 +00:00
parent 4a717d4a47
commit 29ab9f8348
1 changed files with 69 additions and 5 deletions
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74
include/llvm/Constants.h
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@ -11,16 +11,17 @@
#include "llvm/Constant.h"
#include "Support/DataTypes.h"
class ArrayType;
class StructType;
class PointerType;
class ConstantExpr;
//===---------------------------------------------------------------------------
// ConstantBool - Boolean Values
//
class ConstantBool : public Constant {
bool Val;
ConstantBool(const ConstantBool &); // DO NOT IMPLEMENT
ConstantBool(bool V);
~ConstantBool() {}
public:
@ -253,7 +254,7 @@ public:
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantPointer *) { return true; }
static bool classof(const Constant *CPV); // defined in CPV.cpp
static bool classof(const Constant *CPV); // defined in Constants.cpp
static inline bool classof(const Value *V) {
return isa<Constant>(V) && classof(cast<Constant>(V));
}
@ -277,7 +278,7 @@ public:
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantPointerNull *) { return true; }
static inline bool classof(const ConstantPointer *P) {
return P->getNumOperands() == 0;
return (P->getNumOperands() == 0 && P->isNullValue());
}
static inline bool classof(const Constant *CPV) {
return isa<ConstantPointer>(CPV) && classof(cast<ConstantPointer>(CPV));
@ -313,7 +314,8 @@ public:
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantPointerRef *) { return true; }
static inline bool classof(const ConstantPointer *CPV) {
return CPV->getNumOperands() == 1;
// check for a single operand (the target value)
return (CPV->getNumOperands() == 1);
}
static inline bool classof(const Constant *CPV) {
return isa<ConstantPointer>(CPV) && classof(cast<ConstantPointer>(CPV));
@ -324,10 +326,72 @@ public:
// WARNING: Only to be used by Bytecode & Assembly Parsers! USER CODE SHOULD
// NOT USE THIS!!
void mutateReference(GlobalValue *NewGV);
// Returns the number of uses of OldV that were replaced.
virtual unsigned mutateReferences(Value* OldV, Value *NewV);
// END WARNING!!
};
// ConstantExpr - a constant value that is initialized with
// an expression using other constant values. This is only used
// to represent values that cannot be evaluated at compile-time
// (e.g., something derived from an address) because it does
// not have a mechanism to store the actual value.
// Use the appropriate Constant subclass above for known constants.
//
class ConstantExpr : public Constant {
protected:
unsigned iType; // operation type
protected:
ConstantExpr(unsigned opCode, Constant *C, const Type *Ty);
ConstantExpr(unsigned opCode, Constant* C1, Constant* C2, const Type *Ty);
ConstantExpr(unsigned opCode, Constant* C,
const std::vector<Value*>& IdxList, const Type *Ty);
~ConstantExpr() {}
virtual void destroyConstant() { destroyConstantImpl(); }
public:
// Static methods to construct a ConstantExpr of different kinds.
static ConstantExpr *get(unsigned opCode, Constant *C, const Type *Ty);
static ConstantExpr *get(unsigned opCode,
Constant *C1, Constant *C2, const Type *Ty);
static ConstantExpr *get(unsigned opCode, Constant* C,
const std::vector<Value*>& idxList, const Type *Ty);
// isNullValue - Return true if this is the value that would be returned by
// getNullValue.
virtual bool isNullValue() const { return false; }
// getOpcode - Return the opcode at the root of this constant expression
unsigned getOpcode() const { return iType; }
// getOpcodeName - Return a string representation for an opcode.
static const char* getOpcodeName(unsigned opCode);
const char* getOpcodeName() const {
return getOpcodeName(getOpcode());
}
// isConstantExpr - Return true if this is a ConstantExpr
virtual bool isConstantExpr() const { return true; }
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ConstantExpr *) { return true; }
static inline bool classof(const Constant *CPV) {
return CPV->isConstantExpr();
}
static inline bool classof(const Value *V) {
return isa<Constant>(V) && classof(cast<Constant>(V));
}
public:
// WARNING: Only to be used by Bytecode & Assembly Parsers! USER CODE SHOULD
// NOT USE THIS!!
// Returns the number of uses of OldV that were replaced.
virtual unsigned mutateReferences(Value* OldV, Value *NewV);
// END WARNING!!
};
#endif