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/*******************************************************************************
* Copyright (c) 2009, 2017 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 java.util.HashMap;
import java.util.Map;
import org.jacoco.core.internal.instr.InstrSupport;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.commons.AnalyzerAdapter;
/**
* Adapter that creates additional visitor events for probes to be inserted into
* a method.
*/
public final class MethodProbesAdapter extends MethodVisitor {
private final MethodProbesVisitor probesVisitor;
private final IProbeIdGenerator idGenerator;
private AnalyzerAdapter analyzer;
private final Map<Label, Label> tryCatchProbeLabels;
/**
* Create a new adapter instance.
*
* @param probesVisitor
* visitor to delegate to
* @param idGenerator
* generator for unique probe ids
*/
public MethodProbesAdapter(final MethodProbesVisitor probesVisitor,
final IProbeIdGenerator idGenerator) {
super(InstrSupport.ASM_API_VERSION, probesVisitor);
this.probesVisitor = probesVisitor;
this.idGenerator = idGenerator;
this.tryCatchProbeLabels = new HashMap<Label, Label>();
}
/**
* If an analyzer is set {@link IFrame} handles are calculated and emitted
* to the probes methods.
*
* @param analyzer
* optional analyzer to set
*/
public void setAnalyzer(final AnalyzerAdapter analyzer) {
this.analyzer = analyzer;
}
@Override
public void visitTryCatchBlock(Label start, final Label end,
final Label handler, final String type) {
// If a probe will be inserted before the start label, we'll need to use
// a different label for the try-catch block.
if (tryCatchProbeLabels.containsKey(start)) {
start = tryCatchProbeLabels.get(start);
} else if (LabelInfo.needsProbe(start)) {
final Label probeLabel = new Label();
LabelInfo.setSuccessor(probeLabel);
tryCatchProbeLabels.put(start, probeLabel);
start = probeLabel;
}
probesVisitor.visitTryCatchBlock(start, end, handler, type);
}
@Override
public void visitLabel(final Label label) {
if (LabelInfo.needsProbe(label)) {
if (tryCatchProbeLabels.containsKey(label)) {
probesVisitor.visitLabel(tryCatchProbeLabels.get(label));
}
probesVisitor.visitProbe(idGenerator.nextId());
}
probesVisitor.visitLabel(label);
}
@Override
public void visitInsn(final int opcode) {
switch (opcode) {
case Opcodes.IRETURN:
case Opcodes.LRETURN:
case Opcodes.FRETURN:
case Opcodes.DRETURN:
case Opcodes.ARETURN:
case Opcodes.RETURN:
case Opcodes.ATHROW:
probesVisitor.visitInsnWithProbe(opcode, idGenerator.nextId());
break;
default:
probesVisitor.visitInsn(opcode);
break;
}
}
@Override
public void visitJumpInsn(final int opcode, final Label label) {
if (LabelInfo.isMultiTarget(label)) {
probesVisitor.visitJumpInsnWithProbe(opcode, label,
idGenerator.nextId(), frame(jumpPopCount(opcode)));
} else {
probesVisitor.visitJumpInsn(opcode, label);
}
}
private int jumpPopCount(final int opcode) {
switch (opcode) {
case Opcodes.GOTO:
return 0;
case Opcodes.IFEQ:
case Opcodes.IFNE:
case Opcodes.IFLT:
case Opcodes.IFGE:
case Opcodes.IFGT:
case Opcodes.IFLE:
case Opcodes.IFNULL:
case Opcodes.IFNONNULL:
return 1;
default: // IF_CMPxx and IF_ACMPxx
return 2;
}
}
@Override
public void visitLookupSwitchInsn(final Label dflt, final int[] keys,
final Label[] labels) {
if (markLabels(dflt, labels)) {
probesVisitor.visitLookupSwitchInsnWithProbes(dflt, keys, labels,
frame(1));
} else {
probesVisitor.visitLookupSwitchInsn(dflt, keys, labels);
}
}
@Override
public void visitTableSwitchInsn(final int min, final int max,
final Label dflt, final Label... labels) {
if (markLabels(dflt, labels)) {
probesVisitor.visitTableSwitchInsnWithProbes(min, max, dflt,
labels, frame(1));
} else {
probesVisitor.visitTableSwitchInsn(min, max, dflt, labels);
}
}
private boolean markLabels(final Label dflt, final Label[] labels) {
boolean probe = false;
LabelInfo.resetDone(labels);
if (LabelInfo.isMultiTarget(dflt)) {
LabelInfo.setProbeId(dflt, idGenerator.nextId());
probe = true;
}
LabelInfo.setDone(dflt);
for (final Label l : labels) {
if (LabelInfo.isMultiTarget(l) && !LabelInfo.isDone(l)) {
LabelInfo.setProbeId(l, idGenerator.nextId());
probe = true;
}
LabelInfo.setDone(l);
}
return probe;
}
private IFrame frame(final int popCount) {
return FrameSnapshot.create(analyzer, popCount);
}
}
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