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392 lines
14 KiB
C++
392 lines
14 KiB
C++
//===-- llvm/ConstantVals.h - Constant Value nodes ---------------*- C++ -*--=//
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//
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// This file contains the declarations for the Constant class and all of
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// its subclasses, which represent the different type of constant pool values
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CONSTPOOLVALS_H
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#define LLVM_CONSTPOOLVALS_H
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#include "llvm/User.h"
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#include "Support/DataTypes.h"
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class ArrayType;
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class StructType;
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class PointerType;
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//===----------------------------------------------------------------------===//
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// Constant Class
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//===----------------------------------------------------------------------===//
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class Constant : public User {
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protected:
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inline Constant(const Type *Ty) : User(Ty, Value::ConstantVal) {}
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~Constant() {}
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// destroyConstant - Called if some element of this constant is no longer
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// valid. At this point only other constants may be on the use_list for this
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// constant. Any constants on our Use list must also be destroy'd. The
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// implementation must be sure to remove the constant from the list of
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// available cached constants. Implementations should call
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// destroyConstantImpl as the last thing they do, to destroy all users and
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// delete this.
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//
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virtual void destroyConstant() { assert(0 && "Not reached!"); }
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void destroyConstantImpl();
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public:
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// Specialize setName to handle symbol table majik...
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virtual void setName(const string &name, SymbolTable *ST = 0);
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virtual string getStrValue() const = 0;
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// Static constructor to get a '0' constant of arbitrary type...
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static Constant *getNullConstant(const Type *Ty);
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// isNullValue - Return true if this is the value that would be returned by
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// getNullConstant.
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virtual bool isNullValue() const = 0;
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const Constant *) { return true; }
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static inline bool classof(const Value *V) {
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return V->getValueType() == Value::ConstantVal;
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}
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};
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//===----------------------------------------------------------------------===//
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// Classes to represent constant pool variable defs
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//===----------------------------------------------------------------------===//
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//===---------------------------------------------------------------------------
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// ConstantBool - Boolean Values
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//
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class ConstantBool : public Constant {
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bool Val;
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ConstantBool(const ConstantBool &); // DO NOT IMPLEMENT
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ConstantBool(bool V);
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~ConstantBool() {}
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public:
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static ConstantBool *True, *False; // The True & False values
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// Factory objects - Return objects of the specified value
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static ConstantBool *get(bool Value) { return Value ? True : False; }
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static ConstantBool *get(const Type *Ty, bool Value) { return get(Value); }
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// inverted - Return the opposite value of the current value.
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inline ConstantBool *inverted() const { return (this==True) ? False : True; }
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virtual string getStrValue() const;
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inline bool getValue() const { return Val; }
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// isNullValue - Return true if this is the value that would be returned by
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// getNullConstant.
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virtual bool isNullValue() const { return this == False; }
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const ConstantBool *) { return true; }
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static bool classof(const Constant *CPV) {
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return (CPV == True) | (CPV == False);
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}
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static inline bool classof(const Value *V) {
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return isa<Constant>(V) && classof(cast<Constant>(V));
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}
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};
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//===---------------------------------------------------------------------------
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// ConstantInt - Superclass of ConstantSInt & ConstantUInt, to make dealing
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// with integral constants easier.
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//
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class ConstantInt : public Constant {
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protected:
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union {
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int64_t Signed;
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uint64_t Unsigned;
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} Val;
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ConstantInt(const ConstantInt &); // DO NOT IMPLEMENT
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ConstantInt(const Type *Ty, uint64_t V);
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~ConstantInt() {}
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public:
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// equalsInt - Provide a helper method that can be used to determine if the
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// constant contained within is equal to a constant. This only works for very
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// small values, because this is all that can be represented with all types.
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//
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bool equalsInt(unsigned char V) const {
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assert(V <= 127 &&
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"equals: Can only be used with very small positive constants!");
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return Val.Unsigned == V;
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}
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// ConstantInt::get static method: return a constant pool int with the
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// specified value. as above, we work only with very small values here.
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//
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static ConstantInt *get(const Type *Ty, unsigned char V);
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// isNullValue - Return true if this is the value that would be returned by
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// getNullConstant.
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virtual bool isNullValue() const { return Val.Unsigned == 0; }
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const ConstantInt *) { return true; }
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static bool classof(const Constant *CPV); // defined in CPV.cpp
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static inline bool classof(const Value *V) {
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return isa<Constant>(V) && classof(cast<Constant>(V));
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}
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};
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//===---------------------------------------------------------------------------
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// ConstantSInt - Signed Integer Values [sbyte, short, int, long]
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//
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class ConstantSInt : public ConstantInt {
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ConstantSInt(const ConstantSInt &); // DO NOT IMPLEMENT
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protected:
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ConstantSInt(const Type *Ty, int64_t V);
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~ConstantSInt() {}
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public:
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static ConstantSInt *get(const Type *Ty, int64_t V);
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virtual string getStrValue() const;
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static bool isValueValidForType(const Type *Ty, int64_t V);
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inline int64_t getValue() const { return Val.Signed; }
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const ConstantSInt *) { return true; }
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static bool classof(const Constant *CPV); // defined in CPV.cpp
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static inline bool classof(const Value *V) {
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return isa<Constant>(V) && classof(cast<Constant>(V));
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}
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};
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//===---------------------------------------------------------------------------
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// ConstantUInt - Unsigned Integer Values [ubyte, ushort, uint, ulong]
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//
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class ConstantUInt : public ConstantInt {
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ConstantUInt(const ConstantUInt &); // DO NOT IMPLEMENT
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protected:
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ConstantUInt(const Type *Ty, uint64_t V);
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~ConstantUInt() {}
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public:
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static ConstantUInt *get(const Type *Ty, uint64_t V);
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virtual string getStrValue() const;
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static bool isValueValidForType(const Type *Ty, uint64_t V);
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inline uint64_t getValue() const { return Val.Unsigned; }
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const ConstantUInt *) { return true; }
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static bool classof(const Constant *CPV); // defined in CPV.cpp
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static inline bool classof(const Value *V) {
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return isa<Constant>(V) && classof(cast<Constant>(V));
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}
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};
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//===---------------------------------------------------------------------------
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// ConstantFP - Floating Point Values [float, double]
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//
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class ConstantFP : public Constant {
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double Val;
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ConstantFP(const ConstantFP &); // DO NOT IMPLEMENT
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protected:
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ConstantFP(const Type *Ty, double V);
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~ConstantFP() {}
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public:
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static ConstantFP *get(const Type *Ty, double V);
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virtual string getStrValue() const;
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static bool isValueValidForType(const Type *Ty, double V);
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inline double getValue() const { return Val; }
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// isNullValue - Return true if this is the value that would be returned by
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// getNullConstant.
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virtual bool isNullValue() const { return Val == 0; }
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const ConstantFP *) { return true; }
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static bool classof(const Constant *CPV); // defined in CPV.cpp
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static inline bool classof(const Value *V) {
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return isa<Constant>(V) && classof(cast<Constant>(V));
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}
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};
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//===---------------------------------------------------------------------------
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// ConstantArray - Constant Array Declarations
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//
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class ConstantArray : public Constant {
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ConstantArray(const ConstantArray &); // DO NOT IMPLEMENT
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protected:
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ConstantArray(const ArrayType *T, const vector<Constant*> &Val);
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~ConstantArray() {}
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virtual void destroyConstant();
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public:
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static ConstantArray *get(const ArrayType *T, const vector<Constant*> &);
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static ConstantArray *get(const string &Initializer);
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virtual string getStrValue() const;
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inline const ArrayType *getType() const {
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return (ArrayType*)Value::getType();
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}
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inline const vector<Use> &getValues() const { return Operands; }
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// isNullValue - Return true if this is the value that would be returned by
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// getNullConstant.
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virtual bool isNullValue() const { return false; }
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const ConstantArray *) { return true; }
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static bool classof(const Constant *CPV); // defined in CPV.cpp
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static inline bool classof(const Value *V) {
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return isa<Constant>(V) && classof(cast<Constant>(V));
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}
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};
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//===---------------------------------------------------------------------------
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// ConstantStruct - Constant Struct Declarations
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//
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class ConstantStruct : public Constant {
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ConstantStruct(const ConstantStruct &); // DO NOT IMPLEMENT
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protected:
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ConstantStruct(const StructType *T, const vector<Constant*> &Val);
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~ConstantStruct() {}
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virtual void destroyConstant();
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public:
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static ConstantStruct *get(const StructType *T,
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const vector<Constant*> &V);
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virtual string getStrValue() const;
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inline const StructType *getType() const {
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return (StructType*)Value::getType();
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}
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inline const vector<Use> &getValues() const { return Operands; }
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// isNullValue - Return true if this is the value that would be returned by
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// getNullConstant.
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virtual bool isNullValue() const { return false; }
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const ConstantStruct *) { return true; }
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static bool classof(const Constant *CPV); // defined in CPV.cpp
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static inline bool classof(const Value *V) {
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return isa<Constant>(V) && classof(cast<Constant>(V));
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}
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};
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//===---------------------------------------------------------------------------
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// ConstantPointer - Constant Pointer Declarations
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//
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// The ConstantPointer class represents a null pointer of a specific type. For
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// a more specific/useful instance, a subclass of ConstantPointer should be
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// used.
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//
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class ConstantPointer : public Constant {
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ConstantPointer(const ConstantPointer &); // DO NOT IMPLEMENT
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protected:
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inline ConstantPointer(const PointerType *T) : Constant((const Type*)T){}
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~ConstantPointer() {}
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public:
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virtual string getStrValue() const = 0;
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inline const PointerType *getType() const {
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return (PointerType*)Value::getType();
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}
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// isNullValue - Return true if this is the value that would be returned by
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// getNullConstant.
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virtual bool isNullValue() const { return false; }
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const ConstantPointer *) { return true; }
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static bool classof(const Constant *CPV); // defined in CPV.cpp
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static inline bool classof(const Value *V) {
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return isa<Constant>(V) && classof(cast<Constant>(V));
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}
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};
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// ConstantPointerNull - a constant pointer value that points to null
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//
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class ConstantPointerNull : public ConstantPointer {
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ConstantPointerNull(const ConstantPointerNull &); // DO NOT IMPLEMENT
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protected:
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inline ConstantPointerNull(const PointerType *T) : ConstantPointer(T) {}
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inline ~ConstantPointerNull() {}
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public:
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virtual string getStrValue() const;
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static ConstantPointerNull *get(const PointerType *T);
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// isNullValue - Return true if this is the value that would be returned by
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// getNullConstant.
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virtual bool isNullValue() const { return true; }
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const ConstantPointerNull *) { return true; }
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static inline bool classof(const ConstantPointer *P) {
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return P->getNumOperands() == 0;
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}
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static inline bool classof(const Constant *CPV) {
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return isa<ConstantPointer>(CPV) && classof(cast<ConstantPointer>(CPV));
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}
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static inline bool classof(const Value *V) {
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return isa<ConstantPointer>(V) && classof(cast<ConstantPointer>(V));
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}
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};
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// ConstantPointerRef - a constant pointer value that is initialized to
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// point to a global value, which lies at a constant, fixed address.
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//
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class ConstantPointerRef : public ConstantPointer {
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friend class Module; // Modules maintain these references
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ConstantPointerRef(const ConstantPointerRef &); // DNI!
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protected:
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ConstantPointerRef(GlobalValue *GV);
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~ConstantPointerRef() {}
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virtual void destroyConstant() { destroyConstantImpl(); }
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public:
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static ConstantPointerRef *get(GlobalValue *GV);
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virtual string getStrValue() const;
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const GlobalValue *getValue() const {
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return cast<GlobalValue>(Operands[0].get());
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}
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GlobalValue *getValue() {
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return cast<GlobalValue>(Operands[0].get());
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}
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const ConstantPointerRef *) { return true; }
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static inline bool classof(const ConstantPointer *CPV) {
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return CPV->getNumOperands() == 1;
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}
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static inline bool classof(const Constant *CPV) {
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return isa<ConstantPointer>(CPV) && classof(cast<ConstantPointer>(CPV));
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}
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static inline bool classof(const Value *V) {
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return isa<ConstantPointer>(V) && classof(cast<ConstantPointer>(V));
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}
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// WARNING: Only to be used by Bytecode & Assembly Parsers! USER CODE SHOULD
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// NOT USE THIS!!
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void mutateReference(GlobalValue *NewGV);
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// END WARNING!!
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};
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#endif
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