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/*******************************************************************************
* Copyright (c) 2009, 2011 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 static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import java.util.Arrays;
import org.jacoco.core.internal.flow.LabelInfo;
import org.junit.Test;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.commons.EmptyVisitor;
import org.objectweb.asm.tree.FrameNode;
/**
* Unit tests for {@link ProbeVariableInserter}.
*/
public class ProbeVariableInserterTest {
private final MethodVisitor delegate = new EmptyVisitor();
private int var;
@Test
public void testVariableStatic() {
ProbeVariableInserter i = new ProbeVariableInserter(Opcodes.ACC_STATIC,
"()V", delegate);
assertEquals(0, i.variable);
}
@Test
public void testVariableNonStatic() {
ProbeVariableInserter i = new ProbeVariableInserter(0, "()V", delegate);
assertEquals(1, i.variable);
}
@Test
public void testVariableNonStatic_IZObject() {
ProbeVariableInserter i = new ProbeVariableInserter(0,
"(IZLjava/lang/Object;)V", delegate);
assertEquals(4, i.variable);
}
@Test
public void testVariableNonStatic_JD() {
ProbeVariableInserter i = new ProbeVariableInserter(0, "(JD)V",
delegate);
assertEquals(5, i.variable);
}
@Test
public void testVisitVarIns() {
ProbeVariableInserter i = new ProbeVariableInserter(0, "(II)V",
new EmptyVisitor() {
@Override
public void visitVarInsn(final int opcode, final int var) {
ProbeVariableInserterTest.this.var = var;
}
});
// Argument variables stay at the same position:
i.visitVarInsn(Opcodes.ALOAD, 0);
assertEquals(0, var);
i.visitVarInsn(Opcodes.ALOAD, 1);
assertEquals(1, var);
i.visitVarInsn(Opcodes.ALOAD, 2);
assertEquals(2, var);
assertEquals(3, i.variable);
// Local variables are shifted by one:
i.visitVarInsn(Opcodes.ALOAD, 3);
assertEquals(4, var);
i.visitVarInsn(Opcodes.ALOAD, 4);
assertEquals(5, var);
}
@Test
public void testVisitIincInsn() {
ProbeVariableInserter i = new ProbeVariableInserter(0, "(II)V",
new EmptyVisitor() {
@Override
public void visitIincInsn(final int var, final int increment) {
ProbeVariableInserterTest.this.var = var;
}
});
// Argument variables stay at the same position:
i.visitIincInsn(0, 999);
assertEquals(0, var);
i.visitIincInsn(1, 999);
assertEquals(1, var);
i.visitIincInsn(2, 999);
assertEquals(2, var);
assertEquals(3, i.variable);
// Local variables are shifted by one:
i.visitIincInsn(3, 999);
assertEquals(4, var);
i.visitIincInsn(4, 999);
assertEquals(5, var);
}
@Test
public void testVisitLocalVariable() {
ProbeVariableInserter i = new ProbeVariableInserter(0, "(II)V",
new EmptyVisitor() {
@Override
public void visitLocalVariable(final String name,
final String desc, final String signature,
final Label start, final Label end, final int index) {
ProbeVariableInserterTest.this.var = index;
}
});
// Argument variables stay at the same position:
i.visitLocalVariable(null, null, null, null, null, 0);
assertEquals(0, var);
i.visitLocalVariable(null, null, null, null, null, 1);
assertEquals(1, var);
i.visitLocalVariable(null, null, null, null, null, 2);
assertEquals(2, var);
assertEquals(3, i.variable);
// Local variables are shifted by one:
i.visitLocalVariable(null, null, null, null, null, 3);
assertEquals(4, var);
i.visitLocalVariable(null, null, null, null, null, 4);
assertEquals(5, var);
}
@Test
public void testVisitMaxs() {
ProbeVariableInserter i = new ProbeVariableInserter(0, "(II)V",
new EmptyVisitor() {
@Override
public void visitMaxs(final int maxStack,
final int maxLocals) {
ProbeVariableInserterTest.this.var = maxLocals;
}
});
i.visitMaxs(4, 8);
assertEquals(9, var);
}
@Test
public void testVisitFrame() {
final FrameRecorder rec = new FrameRecorder();
ProbeVariableInserter i = new ProbeVariableInserter(0, "(J)V", rec);
// The first (implicit) frame must not be modified:
i.visitFrame(Opcodes.F_NEW, 2, new Object[] { "LFoo;", Opcodes.LONG },
0, new Object[0]);
assertEquals(Arrays.asList((Object) "LFoo;", Opcodes.LONG),
rec.frame.local);
// Starting from the second frame on the probe variable is inserted:
i.visitFrame(Opcodes.F_NEW, 3, new Object[] { "LFoo;", Opcodes.LONG,
"Ljava/lang/String;" }, 0, new Object[0]);
assertEquals(Arrays.asList((Object) "LFoo;", Opcodes.LONG, "[Z",
"Ljava/lang/String;"), rec.frame.local);
}
@Test(expected = IllegalStateException.class)
public void testVisitFrameNegative() {
ProbeVariableInserter i = new ProbeVariableInserter(0, "(J)V", delegate);
i.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
}
@Test
public void testInsertProbeFrame() {
final FrameRecorder rec = new FrameRecorder();
ProbeVariableInserter i = new ProbeVariableInserter(0, "(J)V", rec);
// The first (implicit) frame:
i.visitFrame(Opcodes.F_NEW, 2, new Object[] { "LFoo;", Opcodes.LONG },
0, new Object[0]);
// There must be a label which is a multi-jump target:
Label label = new Label();
LabelInfo.setTarget(label);
LabelInfo.setTarget(label);
i.visitLabel(label);
// Insert a frame for this label:
i.visitFrame(Opcodes.F_NEW, 3, new Object[] { "LFoo;", Opcodes.LONG,
"Ljava/lang/String;" }, 0, new Object[0]);
// Insert this frame again:
rec.frame = null;
i.insertProbeFrame(label);
assertEquals(Arrays.asList((Object) "LFoo;", Opcodes.LONG, "[Z",
"Ljava/lang/String;"), rec.frame.local);
}
@Test
public void testInsertProbeFrameNoFrameForLabel() {
final FrameRecorder rec = new FrameRecorder();
ProbeVariableInserter i = new ProbeVariableInserter(0, "(J)V", rec);
// The first (implicit) frame:
i.visitFrame(Opcodes.F_NEW, 2, new Object[] { "LFoo;", Opcodes.LONG },
0, new Object[0]);
// There must be a label which is a multi-jump target:
Label label = new Label();
LabelInfo.setTarget(label);
LabelInfo.setTarget(label);
i.visitLabel(label);
// Insert a frame for this label:
i.visitFrame(Opcodes.F_NEW, 3, new Object[] { "LFoo;", Opcodes.LONG,
"Ljava/lang/String;" }, 0, new Object[0]);
// Try to insert a frame for a different label:
rec.frame = null;
i.insertProbeFrame(new Label());
assertNull(rec.frame);
}
@Test
public void testInsertProbeFrameNoMultiTarget() {
final FrameRecorder rec = new FrameRecorder();
ProbeVariableInserter i = new ProbeVariableInserter(0, "(J)V", rec);
// The first (implicit) frame:
i.visitFrame(Opcodes.F_NEW, 2, new Object[] { "LFoo;", Opcodes.LONG },
0, new Object[0]);
// The frame for this label isn't required:
Label label = new Label();
i.visitLabel(label);
// Insert a frame for this label:
i.visitFrame(Opcodes.F_NEW, 3, new Object[] { "LFoo;", Opcodes.LONG,
"Ljava/lang/String;" }, 0, new Object[0]);
// Inserting a frame for the label shouldn't work:
rec.frame = null;
i.insertProbeFrame(label);
assertNull(rec.frame);
}
private static class FrameRecorder extends EmptyVisitor {
FrameNode frame;
@Override
public void visitFrame(final int type, final int nLocal,
final Object[] local, final int nStack, final Object[] stack) {
assertEquals(Opcodes.F_NEW, type);
this.frame = new FrameNode(type, nLocal, local, nStack, stack);
}
}
}
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