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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2 91177308-0d34-0410-b5e6-96231b3b80d8
48 lines
1.7 KiB
C++
48 lines
1.7 KiB
C++
//===-- llvm/User.h - User class definition ----------------------*- C++ -*--=//
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//
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// This class defines the interface that one who 'use's a Value must implement.
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// Each instance of the Value class keeps track of what User's have handles
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// to it.
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//
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// * Instructions are the largest class of User's.
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// * Constants may be users of other constants (think arrays and stuff)
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_USER_H
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#define LLVM_USER_H
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#include "llvm/Value.h"
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class User : public Value {
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User(const User &); // Do not implement
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public:
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User(const Type *Ty, ValueTy vty, const string &name = "");
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virtual ~User() {}
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// if i > the number of operands, then getOperand() returns 0, and setOperand
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// returns false. setOperand() may also return false if the operand is of
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// the wrong type.
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//
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virtual Value *getOperand(unsigned i) = 0;
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virtual const Value *getOperand(unsigned i) const = 0;
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virtual bool setOperand(unsigned i, Value *Val) = 0;
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// dropAllReferences() - This virtual function should be overridden to "let
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// go" of all references that this user is maintaining. This allows one to
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// 'delete' a whole class at a time, even though there may be circular
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// references... first all references are dropped, and all use counts go to
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// zero. Then everything is delete'd for real. Note that no operations are
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// valid on an object that has "dropped all references", except operator
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// delete.
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//
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virtual void dropAllReferences() = 0;
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// replaceUsesOfWith - Replaces all references to the "From" definition with
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// references to the "To" definition. (defined in Value.cpp)
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//
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void replaceUsesOfWith(Value *From, Value *To);
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};
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#endif
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