/***
* bytecode-analysis: a prototype-library based on ASM 4 that
* computes definitions/uses of each instruction
* Copyright (c) 2014 University of Sao Paulo
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
package br.usp.each.saeg.bytecode.analysis;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
import org.objectweb.asm.tree.MethodNode;
import org.objectweb.asm.tree.analysis.Analyzer;
import org.objectweb.asm.tree.analysis.AnalyzerException;
import org.objectweb.asm.tree.analysis.BasicInterpreter;
import org.objectweb.asm.tree.analysis.BasicValue;
import org.objectweb.asm.tree.analysis.Frame;
import br.usp.each.saeg.bytecode.analysis.domain.Edge;
public class EdgeAnalyzer extends Analyzer<BasicValue> {
private Set<Edge> edges = Collections.emptySet();
private Set<Edge> exceptionEdges = Collections.emptySet();
private final boolean exceptionFlow;
public EdgeAnalyzer(final boolean exceptionFlow) {
super(new BasicInterpreter());
this.exceptionFlow = exceptionFlow;
}
@Override
public Frame<BasicValue>[] analyze(final String owner, final MethodNode m)
throws AnalyzerException {
edges = new LinkedHashSet<Edge>();
exceptionEdges = new LinkedHashSet<Edge>();
return super.analyze(owner, m);
}
@Override
protected void newControlFlowEdge(final int src, final int dest) {
edges.add(new Edge(src, dest));
}
@Override
protected boolean newControlFlowExceptionEdge(final int src, final int dest) {
if (exceptionFlow) {
exceptionEdges.add(new Edge(src, dest));
return true;
}
return false;
}
public Edge[] getEdges() {
return edges.toArray(new Edge[edges.size()]);
}
public Edge[] getExceptionEdges() {
return exceptionEdges.toArray(new Edge[exceptionEdges.size()]);
}
}