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/*******************************************************************************
* Copyright (c) 2009, 2013 Mountainminds GmbH & Co. KG and Contributors
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Marc R. Hoffmann - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.internal.flow;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
/**
* A {@link org.objectweb.asm.ClassVisitor} that calculates probes for every
* method.
*/
public class ClassProbesAdapter extends ClassVisitor implements
IProbeIdGenerator {
private static final MethodProbesVisitor EMPTY_METHOD_PROBES_VISITOR;
static {
class Impl extends MethodProbesVisitor {
@Override
public void visitProbe(final int probeId) {
// nothing to do
}
@Override
public void visitJumpInsnWithProbe(final int opcode,
final Label label, final int probeId) {
// nothing to do
}
@Override
public void visitInsnWithProbe(final int opcode, final int probeId) {
// nothing to do
}
@Override
public void visitTableSwitchInsnWithProbes(final int min,
final int max, final Label dflt, final Label[] labels) {
// nothing to do
}
@Override
public void visitLookupSwitchInsnWithProbes(final Label dflt,
final int[] keys, final Label[] labels) {
// nothing to do
}
}
EMPTY_METHOD_PROBES_VISITOR = new Impl();
}
private static class ProbeCounter implements IProbeIdGenerator {
int count = 0;
public int nextId() {
return count++;
}
}
private final ClassProbesVisitor cv;
private int counter = 0;
private boolean interfaceType;
/**
* Creates a new adapter that delegates to the given visitor.
*
* @param cv
* instance to delegate to
*/
public ClassProbesAdapter(final ClassProbesVisitor cv) {
super(Opcodes.ASM4, cv);
this.cv = cv;
}
@Override
public void visit(final int version, final int access, final String name,
final String signature, final String superName,
final String[] interfaces) {
interfaceType = (access & Opcodes.ACC_INTERFACE) != 0;
super.visit(version, access, name, signature, superName, interfaces);
}
@Override
public final MethodVisitor visitMethod(final int access, final String name,
final String desc, final String signature, final String[] exceptions) {
final MethodProbesVisitor methodProbes;
final MethodProbesVisitor mv = cv.visitMethod(access, name, desc,
signature, exceptions);
if (mv == null) {
// We need to visit the method in any case, otherwise probe ids
// are not reproducible
methodProbes = EMPTY_METHOD_PROBES_VISITOR;
} else {
methodProbes = mv;
}
return new MethodSanitizer(null, access, name, desc, signature,
exceptions) {
@Override
public void visitEnd() {
super.visitEnd();
LabelFlowAnalyzer.markLabels(this);
if (interfaceType) {
final ProbeCounter probeCounter = new ProbeCounter();
final MethodProbesAdapter adapter = new MethodProbesAdapter(
EMPTY_METHOD_PROBES_VISITOR, probeCounter);
// We do not use the accept() method as ASM resets labels
// after every call to accept()
instructions.accept(adapter);
cv.visitTotalProbeCount(probeCounter.count);
}
this.accept(new MethodProbesAdapter(methodProbes,
ClassProbesAdapter.this));
}
};
}
@Override
public void visitEnd() {
if (!interfaceType) {
cv.visitTotalProbeCount(counter);
}
super.visitEnd();
}
// === IProbeIdGenerator ===
public int nextId() {
return counter++;
}
}
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