113 lines
2.8 KiB
Java
113 lines
2.8 KiB
Java
/*******************************************************************************
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* Copyright (c) 2002 - 2006 IBM Corporation.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package com.ibm.wala.ssa;
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/**
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* An instruction representing a monitorenter or monitorexit operation.
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*/
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public abstract class SSAMonitorInstruction extends SSAInstruction {
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/**
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* The value number of the object being locked or unlocked
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*/
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private final int ref;
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/**
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* Does this instruction represent a monitorenter?
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*/
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private final boolean isEnter;
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/**
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* @param ref The value number of the object being locked or unlocked
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* @param isEnter Does this instruction represent a monitorenter?
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*/
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protected SSAMonitorInstruction(int index, int ref, boolean isEnter) {
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super(index);
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this.ref = ref;
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this.isEnter = isEnter;
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}
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@Override
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public SSAInstruction copyForSSA(SSAInstructionFactory insts, int[] defs, int[] uses) {
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assert uses == null || uses.length == 1;
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return insts.MonitorInstruction(iindex, uses == null ? ref : uses[0], isEnter);
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}
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@Override
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public String toString(SymbolTable symbolTable) {
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return "monitor" + (isEnter ? "enter " : "exit ") + getValueString(symbolTable, ref);
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}
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/**
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* @see com.ibm.wala.ssa.SSAInstruction#visit(IVisitor)
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* @throws IllegalArgumentException if v is null
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*/
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@Override
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public void visit(IVisitor v) {
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if (v == null) {
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throw new IllegalArgumentException("v is null");
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}
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v.visitMonitor(this);
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}
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/**
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* @see com.ibm.wala.ssa.SSAInstruction#getNumberOfUses()
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*/
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@Override
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public int getNumberOfUses() {
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return 1;
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}
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/**
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* @see com.ibm.wala.ssa.SSAInstruction#getUse(int)
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*/
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@Override
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public int getUse(int j) {
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assert j == 0;
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return ref;
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}
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@Override
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public int hashCode() {
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return ref * 6173 + 4423;
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}
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/*
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* @see com.ibm.wala.ssa.Instruction#isPEI()
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*/
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@Override
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public boolean isPEI() {
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return true;
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}
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/*
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* @see com.ibm.wala.ssa.Instruction#isFallThrough()
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*/
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@Override
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public boolean isFallThrough() {
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return true;
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}
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/**
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* @return The value number of the object being locked or unlocked
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*/
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public int getRef() {
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return ref;
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}
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/**
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* Does this instruction represent a monitorenter?
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*/
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public boolean isMonitorEnter() {
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return isEnter;
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}
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}
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