107 lines
2.8 KiB
Java
107 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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* A "catch" instruction, inserted at the head of a catch block, which assigns a pending exception object to a local variable.
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*
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* In SSA {@link IR}s, these instructions do <em>not</em> appear in the normal instruction array returned by IR.getInstructions();
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* instead these instructions live in {@link ISSABasicBlock}.
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*/
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public class SSAGetCaughtExceptionInstruction extends SSAInstruction {
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private final int exceptionValueNumber;
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private final int bbNumber;
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public SSAGetCaughtExceptionInstruction(int index, int bbNumber, int exceptionValueNumber) {
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super(index);
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this.exceptionValueNumber = exceptionValueNumber;
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this.bbNumber = bbNumber;
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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 defs == null || defs.length == 1;
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return insts.GetCaughtExceptionInstruction(iindex, bbNumber, defs == null ? exceptionValueNumber : defs[0]);
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}
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@Override
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public String toString(SymbolTable symbolTable) {
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StringBuffer s = new StringBuffer();
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s.append(getValueString(symbolTable, exceptionValueNumber)).append(" = getCaughtException ");
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return s.toString();
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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.visitGetCaughtException(this);
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}
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/**
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* Returns the result.
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*
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* @return int
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*/
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public int getException() {
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return exceptionValueNumber;
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}
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/**
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* @see com.ibm.wala.ssa.SSAInstruction#getDef()
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*/
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@Override
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public boolean hasDef() {
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return true;
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}
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@Override
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public int getDef() {
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return exceptionValueNumber;
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}
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@Override
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public int getDef(int i) {
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assert i == 0;
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return exceptionValueNumber;
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}
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@Override
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public int getNumberOfDefs() {
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return 1;
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}
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public int getBasicBlockNumber() {
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return bbNumber;
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}
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@Override
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public int hashCode() {
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return 2243 * exceptionValueNumber;
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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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