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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:
* Evgeny Mandrikov - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.test.validation;
import static org.junit.Assert.assertTrue;
import org.jacoco.core.instr.Instrumenter;
import org.jacoco.core.runtime.IRuntime;
import org.jacoco.core.runtime.RuntimeData;
import org.jacoco.core.runtime.SystemPropertiesRuntime;
import org.jacoco.core.test.TargetLoader;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
/**
* Test of ASM bug <a href=
* "http://forge.ow2.org/tracker/?func=detail&aid=317630&group_id=23&atid=100023">#317630</a>
* that caused {@code java.lang.ClassNotFoundException}.
*/
public class ResizeInstructionsTest {
private final IRuntime runtime = new SystemPropertiesRuntime();
private final Instrumenter instrumenter = new Instrumenter(runtime);
private boolean computedCommonSuperClass = false;
@Before
public void setup() throws Exception {
runtime.startup(new RuntimeData());
}
@After
public void teardown() {
runtime.shutdown();
}
@Test
public void test() throws Exception {
final String className = "Example";
final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES) {
@Override
protected String getCommonSuperClass(final String type1,
final String type2) {
computedCommonSuperClass |= className.equals(type1)
|| className.equals(type2);
return "java/lang/Object";
}
};
cw.visit(Opcodes.V1_5, Opcodes.ACC_PUBLIC, className, null,
"java/lang/Object", null);
final MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "m", "()V",
null, null);
mv.visitCode();
addCauseOfResizeInstructions(mv);
addCauseOfGetCommonSuperClass(mv);
mv.visitMaxs(1, 1);
mv.visitEnd();
cw.visitEnd();
final byte[] original = cw.toByteArray();
assertTrue(computedCommonSuperClass);
new TargetLoader().add(className, original);
final byte[] instrumented = instrumenter.instrument(original,
className);
new TargetLoader().add(className, instrumented);
}
/**
* Adds code that requires
* {@link ClassWriter#getCommonSuperClass(String, String)}.
*
* <pre>
* Object o = this;
* while (true) {
* o = (Integer) null;
* }
* </pre>
*/
private static void addCauseOfGetCommonSuperClass(final MethodVisitor mv) {
mv.visitVarInsn(Opcodes.ALOAD, 0);
mv.visitVarInsn(Opcodes.ASTORE, 1);
Label label = new Label();
mv.visitLabel(label);
mv.visitInsn(Opcodes.ACONST_NULL);
mv.visitTypeInsn(Opcodes.CHECKCAST, "java/lang/Integer");
mv.visitVarInsn(Opcodes.ASTORE, 1);
mv.visitJumpInsn(Opcodes.GOTO, label);
}
/**
* Adds code that triggers usage of
* {@link org.objectweb.asm.MethodWriter#INSERTED_FRAMES} during
* instrumentation.
*/
private static void addCauseOfResizeInstructions(final MethodVisitor mv) {
mv.visitInsn(Opcodes.ICONST_0);
mv.visitInsn(Opcodes.ICONST_1);
final Label target = new Label();
mv.visitJumpInsn(Opcodes.IFLE, target);
for (int i = 0; i < Short.MAX_VALUE; i++) {
mv.visitInsn(Opcodes.NOP);
}
mv.visitLabel(target);
}
}
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