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80 lines
2.9 KiB
C++
80 lines
2.9 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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#include <vector>
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class User : public Value {
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User(const User &); // Do not implement
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protected:
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vector<Use> Operands;
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public:
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User(const Type *Ty, ValueTy vty, const string &name = "");
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virtual ~User() { dropAllReferences(); }
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inline Value *getOperand(unsigned i) {
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assert(i < Operands.size() && "getOperand() out of range!");
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return Operands[i];
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}
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inline const Value *getOperand(unsigned i) const {
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assert(i < Operands.size() && "getOperand() const out of range!");
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return Operands[i];
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}
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inline void setOperand(unsigned i, Value *Val) {
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assert(i < Operands.size() && "setOperand() out of range!");
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Operands[i] = Val;
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}
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inline unsigned getNumOperands() const { return Operands.size(); }
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// ---------------------------------------------------------------------------
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// Operand Iterator interface...
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//
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typedef vector<Use>::iterator op_iterator;
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typedef vector<Use>::const_iterator op_const_iterator;
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inline op_iterator op_begin() { return Operands.begin(); }
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inline op_const_iterator op_begin() const { return Operands.begin(); }
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inline op_iterator op_end() { return Operands.end(); }
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inline op_const_iterator op_end() const { return Operands.end(); }
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// dropAllReferences() - This function is in charge of "letting go" of all
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// objects that this User refers to. 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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inline void dropAllReferences() {
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Operands.clear();
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}
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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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// addOperand - This is a special purpose API that should not be used in most
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// cases. It adds an empty (null) operand to the instruction specified. This
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// is currently used by the back end as part of the "lowering" process... most
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// optimizations will not handle instructions that are not in their normal
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// form, so this method should be used with care.
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//
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void addOperand() {
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Operands.push_back(Use(0, this));
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}
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};
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#endif
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