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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import com.ibm.wala.types.FieldReference;
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/**
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* SSA instruction that reads a field (i.e. getstatic or getfield).
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*/
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public abstract class SSAGetInstruction extends SSAFieldAccessInstruction {
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private final int result;
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protected SSAGetInstruction(int iindex, int result, int ref, FieldReference field) {
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super(iindex, field, ref);
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this.result = result;
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}
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protected SSAGetInstruction(int iindex, int result, FieldReference field) {
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super(iindex, field, -1);
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this.result = result;
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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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if (isStatic())
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return insts.GetInstruction(iindex, defs == null || defs.length == 0 ? result : defs[0], getDeclaredField());
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else
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return insts.GetInstruction(iindex, defs == null || defs.length == 0 ? result : defs[0], uses == null ? getRef() : uses[0],
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getDeclaredField());
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}
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@Override
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public String toString(SymbolTable symbolTable) {
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if (isStatic()) {
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return getValueString(symbolTable, result) + " = getstatic " + getDeclaredField();
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} else {
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return getValueString(symbolTable, result) + " = getfield " + getDeclaredField() + " "
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+ getValueString(symbolTable, getRef());
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}
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}
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/**
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* @see com.ibm.wala.ssa.SSAInstruction#visit(IVisitor)
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*/
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@Override
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public void visit(IVisitor v) throws NullPointerException {
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v.visitGet(this);
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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 result;
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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 result;
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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 getNumberOfDefs() {
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return 1;
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}
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@Override
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public int getNumberOfUses() {
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return (isStatic()) ? 0 : 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 && getRef() != -1;
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return getRef();
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}
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@Override
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public int hashCode() {
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return result * 2371 + 6521;
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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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