Java tutorial
/******************************************************************************* * Copyright (c) 2009, 2012 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); } } }