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/*******************************************************************************
* Copyright (c) 2009, 2019 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.instr;
import org.jacoco.core.internal.flow.IFrame;
import org.jacoco.core.internal.flow.LabelInfo;
import org.jacoco.core.internal.flow.MethodProbesVisitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
/**
* This method adapter inserts probes as requested by the
* {@link MethodProbesVisitor} events.
*/
class MethodInstrumenter extends MethodProbesVisitor {
private final IProbeInserter probeInserter;
/**
* Create a new instrumenter instance for the given method.
*
* @param mv
* next method visitor in the chain
* @param probeInserter
* call-back to insert probes where required
*/
public MethodInstrumenter(final MethodVisitor mv,
final IProbeInserter probeInserter) {
super(mv);
this.probeInserter = probeInserter;
}
// === IMethodProbesVisitor ===
@Override
public void visitProbe(final int probeId) {
probeInserter.insertProbe(probeId);
}
@Override
public void visitInsnWithProbe(final int opcode, final int probeId) {
probeInserter.insertProbe(probeId);
mv.visitInsn(opcode);
}
@Override
public void visitJumpInsnWithProbe(final int opcode, final Label label,
final int probeId, final IFrame frame) {
if (opcode == Opcodes.GOTO) {
probeInserter.insertProbe(probeId);
mv.visitJumpInsn(Opcodes.GOTO, label);
} else {
final Label intermediate = new Label();
mv.visitJumpInsn(getInverted(opcode), intermediate);
probeInserter.insertProbe(probeId);
mv.visitJumpInsn(Opcodes.GOTO, label);
mv.visitLabel(intermediate);
frame.accept(mv);
}
}
private int getInverted(final int opcode) {
switch (opcode) {
case Opcodes.IFEQ:
return Opcodes.IFNE;
case Opcodes.IFNE:
return Opcodes.IFEQ;
case Opcodes.IFLT:
return Opcodes.IFGE;
case Opcodes.IFGE:
return Opcodes.IFLT;
case Opcodes.IFGT:
return Opcodes.IFLE;
case Opcodes.IFLE:
return Opcodes.IFGT;
case Opcodes.IF_ICMPEQ:
return Opcodes.IF_ICMPNE;
case Opcodes.IF_ICMPNE:
return Opcodes.IF_ICMPEQ;
case Opcodes.IF_ICMPLT:
return Opcodes.IF_ICMPGE;
case Opcodes.IF_ICMPGE:
return Opcodes.IF_ICMPLT;
case Opcodes.IF_ICMPGT:
return Opcodes.IF_ICMPLE;
case Opcodes.IF_ICMPLE:
return Opcodes.IF_ICMPGT;
case Opcodes.IF_ACMPEQ:
return Opcodes.IF_ACMPNE;
case Opcodes.IF_ACMPNE:
return Opcodes.IF_ACMPEQ;
case Opcodes.IFNULL:
return Opcodes.IFNONNULL;
case Opcodes.IFNONNULL:
return Opcodes.IFNULL;
}
throw new IllegalArgumentException();
}
@Override
public void visitTableSwitchInsnWithProbes(final int min, final int max,
final Label dflt, final Label[] labels, final IFrame frame) {
// 1. Calculate intermediate labels:
LabelInfo.resetDone(dflt);
LabelInfo.resetDone(labels);
final Label newDflt = createIntermediate(dflt);
final Label[] newLabels = createIntermediates(labels);
mv.visitTableSwitchInsn(min, max, newDflt, newLabels);
// 2. Insert probes:
insertIntermediateProbes(dflt, labels, frame);
}
@Override
public void visitLookupSwitchInsnWithProbes(final Label dflt,
final int[] keys, final Label[] labels, final IFrame frame) {
// 1. Calculate intermediate labels:
LabelInfo.resetDone(dflt);
LabelInfo.resetDone(labels);
final Label newDflt = createIntermediate(dflt);
final Label[] newLabels = createIntermediates(labels);
mv.visitLookupSwitchInsn(newDflt, keys, newLabels);
// 2. Insert probes:
insertIntermediateProbes(dflt, labels, frame);
}
private Label[] createIntermediates(final Label[] labels) {
final Label[] intermediates = new Label[labels.length];
for (int i = 0; i < labels.length; i++) {
intermediates[i] = createIntermediate(labels[i]);
}
return intermediates;
}
private Label createIntermediate(final Label label) {
final Label intermediate;
if (LabelInfo.getProbeId(label) == LabelInfo.NO_PROBE) {
intermediate = label;
} else {
if (LabelInfo.isDone(label)) {
intermediate = LabelInfo.getIntermediateLabel(label);
} else {
intermediate = new Label();
LabelInfo.setIntermediateLabel(label, intermediate);
LabelInfo.setDone(label);
}
}
return intermediate;
}
private void insertIntermediateProbe(final Label label, final IFrame frame) {
final int probeId = LabelInfo.getProbeId(label);
if (probeId != LabelInfo.NO_PROBE && !LabelInfo.isDone(label)) {
mv.visitLabel(LabelInfo.getIntermediateLabel(label));
frame.accept(mv);
probeInserter.insertProbe(probeId);
mv.visitJumpInsn(Opcodes.GOTO, label);
LabelInfo.setDone(label);
}
}
private void insertIntermediateProbes(final Label dflt,
final Label[] labels, final IFrame frame) {
LabelInfo.resetDone(dflt);
LabelInfo.resetDone(labels);
insertIntermediateProbe(dflt, frame);
for (final Label l : labels) {
insertIntermediateProbe(l, frame);
}
}
}
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