69 lines
2.1 KiB
Java
69 lines
2.1 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.cast.ir.ssa;
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import com.ibm.wala.ssa.SSAInstruction;
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import com.ibm.wala.ssa.SSAInstructionFactory;
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import com.ibm.wala.ssa.SSAUnaryOpInstruction;
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import com.ibm.wala.ssa.SymbolTable;
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/**
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* A simple assignment statement. Only appears in the IR before SSA conversion, and temporarily when needed to undo copy propagation
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* during processing of new lexical definitions and uses.
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*
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* @author Julian Dolby (dolby@us.ibm.com)
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*
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*/
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public class AssignInstruction extends SSAUnaryOpInstruction {
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/**
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* create the assignment v_result := v_val
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*
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* @param result
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* @param val
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*/
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public AssignInstruction(int iindex, int result, int val) {
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super(iindex, null, result, val);
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assert result != val;
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assert result != -1;
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assert val != -1;
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}
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/*
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* @see com.ibm.wala.ssa.SSAInstruction#copyForSSA(int[], int[])
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*/
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public SSAInstruction copyForSSA(SSAInstructionFactory insts, int[] defs, int[] uses) {
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return ((AstInstructionFactory) insts)
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.AssignInstruction(iindex, defs == null ? getDef(0) : defs[0], uses == null ? getUse(0) : uses[0]);
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}
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/*
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* @see com.ibm.wala.ssa.SSAInstruction#toString(com.ibm.wala.ssa.SymbolTable, com.ibm.wala.ssa.ValueDecorator)
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*/
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public String toString(SymbolTable symbolTable) {
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return getValueString(symbolTable, result) + " := " + getValueString(symbolTable, val);
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}
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/*
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* @see com.ibm.wala.ssa.SSAInstruction#visit(com.ibm.wala.ssa.SSAInstruction.Visitor)
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*/
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public void visit(IVisitor v) {
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((AstPreInstructionVisitor) v).visitAssign(this);
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}
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/**
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* @return
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*/
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public int getVal() {
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return getUse(0);
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}
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}
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