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100 lines
4.0 KiB
C++
100 lines
4.0 KiB
C++
//===-- llvm/Constant.h - Constant class definition -------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the declaration of the Constant class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CONSTANT_H
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#define LLVM_CONSTANT_H
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#include "llvm/User.h"
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namespace llvm {
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class Constant : public User {
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protected:
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inline Constant(const Type *Ty, ValueTy vty = Value::SimpleConstantVal,
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const std::string& Name = "")
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: User(Ty, vty, Name) {}
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~Constant() {}
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void destroyConstantImpl();
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public:
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// setName - Specialize setName to handle symbol table majik...
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virtual void setName(const std::string &name, SymbolTable *ST = 0);
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/// Static constructor to get a '0' constant of arbitrary type...
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///
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static Constant *getNullValue(const Type *Ty);
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/// isNullValue - Return true if this is the value that would be returned by
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/// getNullValue.
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virtual bool isNullValue() const = 0;
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virtual void print(std::ostream &O) const;
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// Specialize get/setOperand for Constant's as their operands are always
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// constants as well.
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Constant *getOperand(unsigned i) {
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return static_cast<Constant*>(User::getOperand(i));
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}
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const Constant *getOperand(unsigned i) const {
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return static_cast<const Constant*>(User::getOperand(i));
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}
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void setOperand(unsigned i, Constant *C) {
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User::setOperand(i, C);
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}
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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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virtual void destroyConstant() { assert(0 && "Not reached!"); }
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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 GlobalValue *) { return true; }
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static inline bool classof(const Value *V) {
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return V->getValueType() == Value::SimpleConstantVal ||
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V->getValueType() == Value::ConstantExprVal ||
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V->getValueType() == Value::ConstantAggregateZeroVal ||
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V->getValueType() == Value::FunctionVal ||
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V->getValueType() == Value::GlobalVariableVal ||
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V->getValueType() == Value::UndefValueVal;
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}
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/// replaceUsesOfWithOnConstant - This method is a special form of
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/// User::replaceUsesOfWith (which does not work on constants) that does work
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/// on constants. Basically this method goes through the trouble of building
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/// a new constant that is equivalent to the current one, with all uses of
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/// From replaced with uses of To. After this construction is completed, all
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/// of the users of 'this' are replaced to use the new constant, and then
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/// 'this' is deleted. In general, you should not call this method, instead,
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/// use Value::replaceAllUsesWith, which automatically dispatches to this
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/// method as needed.
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///
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virtual void replaceUsesOfWithOnConstant(Value *From, Value *To,
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bool DisableChecking = false) {
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// Provide a default implementation for constants (like integers) that
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// cannot use any other values. This cannot be called at runtime, but needs
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// to be here to avoid link errors.
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assert(getNumOperands() == 0 && "replaceUsesOfWithOnConstant must be "
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"implemented for all constants that have operands!");
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assert(0 && "Constants that do not have operands cannot be using 'From'!");
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}
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};
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} // End llvm namespace
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#endif
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