86 lines
2.4 KiB
Java
86 lines
2.4 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 java.util.Collection;
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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.SymbolTable;
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import com.ibm.wala.types.TypeReference;
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/**
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* An assert statement, as found in a variety of languages. It has a
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* use which is the value being asserted to be true. Additionally,
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* there is flag which denotes whether the assertion is from a
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* specification (the usual case) or is an assertion introduced by
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* "compilation" of whatever sort (e.g. to add assertions regarding
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* loop conditions needed by bounded model checking).
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*
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* @author Julian Dolby (dolby@us.ibm.com)
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*/
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public class AstAssertInstruction extends SSAInstruction {
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private final int value;
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private final boolean fromSpecification;
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public AstAssertInstruction(int iindex, int value, boolean fromSpecification) {
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super(iindex);
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this.value = value;
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this.fromSpecification = fromSpecification;
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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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@Override
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public int getUse(int i) {
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assert i == 0;
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return value;
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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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return ((AstInstructionFactory)insts).AssertInstruction(iindex, uses == null ? value : uses[0], fromSpecification);
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}
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@Override
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public String toString(SymbolTable symbolTable) {
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return "assert " + getValueString(symbolTable, value) + " (fromSpec: " + fromSpecification + ")";
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}
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@Override
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public void visit(IVisitor v) {
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((AstInstructionVisitor) v).visitAssert(this);
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}
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@Override
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public int hashCode() {
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return 2177 * value;
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}
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@Override
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public Collection<TypeReference> getExceptionTypes() {
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return null;
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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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public boolean isFromSpecification() {
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return fromSpecification;
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}
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}
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