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/*******************************************************************************
* Copyright (c) 2009, 2022 Mountainminds GmbH & Co. KG and Contributors
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Evgeny Mandrikov - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.internal.analysis.filter;
import java.util.HashSet;
import java.util.Set;
import org.jacoco.core.internal.instr.InstrSupport;
import org.junit.Test;
import org.objectweb.asm.Label;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.MethodNode;
/**
* Unit tests for {@link KotlinWhenStringFilter}.
*/
public class KotlinWhenStringFilterTest extends FilterTestBase {
private final IFilter filter = new KotlinWhenStringFilter();
@Test
public void should_filter() {
final Set<AbstractInsnNode> expectedNewTargets = new HashSet<AbstractInsnNode>();
final MethodNode m = new MethodNode(InstrSupport.ASM_API_VERSION, 0,
"name", "()V", null, null);
final Label h1 = new Label();
final Label sameHash = new Label();
final Label h2 = new Label();
final Label case1 = new Label();
final Label case2 = new Label();
final Label case3 = new Label();
final Label defaultCase = new Label();
// filter should not remember this unrelated slot
m.visitLdcInsn("");
m.visitVarInsn(Opcodes.ASTORE, 1);
m.visitVarInsn(Opcodes.ALOAD, 1);
// switch (...)
m.visitVarInsn(Opcodes.ASTORE, 2);
m.visitVarInsn(Opcodes.ALOAD, 2);
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "hashCode",
"()I", false);
m.visitTableSwitchInsn(97, 98, defaultCase, h1, h2);
// case "a"
m.visitLabel(h1);
final AbstractInsnNode expectedFromInclusive = m.instructions.getLast();
m.visitVarInsn(Opcodes.ALOAD, 2);
m.visitLdcInsn("a");
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals",
"(Ljava/lang/Object;)Z", false);
m.visitJumpInsn(Opcodes.IFEQ, sameHash);
m.visitJumpInsn(Opcodes.GOTO, case1);
// case "\u0000a"
m.visitLabel(sameHash);
m.visitVarInsn(Opcodes.ALOAD, 2);
m.visitLdcInsn("\u0000a");
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals",
"(Ljava/lang/Object;)Z", false);
m.visitJumpInsn(Opcodes.IFEQ, defaultCase);
m.visitJumpInsn(Opcodes.GOTO, case2);
// case "b"
m.visitLabel(h2);
m.visitVarInsn(Opcodes.ALOAD, 2);
m.visitLdcInsn("\u0000a");
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals",
"(Ljava/lang/Object;)Z", false);
m.visitJumpInsn(Opcodes.IFEQ, defaultCase);
m.visitJumpInsn(Opcodes.GOTO, case3);
final AbstractInsnNode expectedToInclusive = m.instructions.getLast();
m.visitLabel(case1);
m.visitInsn(Opcodes.RETURN);
expectedNewTargets.add(m.instructions.getLast());
m.visitLabel(case2);
m.visitInsn(Opcodes.RETURN);
expectedNewTargets.add(m.instructions.getLast());
m.visitLabel(case3);
m.visitInsn(Opcodes.RETURN);
expectedNewTargets.add(m.instructions.getLast());
m.visitLabel(defaultCase);
m.visitInsn(Opcodes.RETURN);
expectedNewTargets.add(m.instructions.getLast());
filter.filter(m, context, output);
assertReplacedBranches(expectedFromInclusive.getPrevious(),
expectedNewTargets);
assertIgnored(new Range(expectedFromInclusive, expectedToInclusive));
}
/**
* <pre>
* fun example(p: String) {
* when (p) {
* "b" -> return
* "a" -> return
* "\u0000a" -> return
* }
* }
* </pre>
*/
@Test
public void should_filter_when_biggest_hashCode_first() {
final Set<AbstractInsnNode> expectedNewTargets = new HashSet<AbstractInsnNode>();
final MethodNode m = new MethodNode(InstrSupport.ASM_API_VERSION, 0,
"example", "(Ljava/lang/String;)V", null, null);
final Label h1 = new Label();
final Label sameHash = new Label();
final Label h2 = new Label();
final Label case1 = new Label();
final Label case2 = new Label();
final Label case3 = new Label();
final Label defaultCase = new Label();
m.visitVarInsn(Opcodes.ALOAD, 2);
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "hashCode",
"()I", false);
m.visitTableSwitchInsn(97, 98, defaultCase, h1, h2);
m.visitLabel(h1);
final AbstractInsnNode expectedFromInclusive = m.instructions.getLast();
m.visitVarInsn(Opcodes.ALOAD, 2);
m.visitLdcInsn("a");
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals",
"(Ljava/lang/Object;)Z", false);
m.visitJumpInsn(Opcodes.IFEQ, sameHash);
m.visitJumpInsn(Opcodes.GOTO, case2);
m.visitLabel(sameHash);
m.visitVarInsn(Opcodes.ALOAD, 2);
m.visitLdcInsn("\u0000a");
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals",
"(Ljava/lang/Object;)Z", false);
m.visitJumpInsn(Opcodes.IFEQ, defaultCase);
m.visitJumpInsn(Opcodes.GOTO, case3);
m.visitLabel(h2);
m.visitVarInsn(Opcodes.ALOAD, 2);
m.visitLdcInsn("b");
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals",
"(Ljava/lang/Object;)Z", false);
m.visitJumpInsn(Opcodes.IFEQ, defaultCase);
final AbstractInsnNode expectedToInclusive = m.instructions.getLast();
m.visitLabel(case1);
m.visitInsn(Opcodes.RETURN);
expectedNewTargets.add(m.instructions.getLast());
m.visitLabel(case2);
m.visitInsn(Opcodes.RETURN);
expectedNewTargets.add(m.instructions.getLast());
m.visitLabel(case3);
m.visitInsn(Opcodes.RETURN);
expectedNewTargets.add(m.instructions.getLast());
m.visitLabel(defaultCase);
m.visitInsn(Opcodes.RETURN);
expectedNewTargets.add(m.instructions.getLast());
filter.filter(m, context, output);
assertIgnored(new Range(expectedFromInclusive, expectedToInclusive));
assertReplacedBranches(expectedFromInclusive.getPrevious(),
expectedNewTargets);
}
@Test
public void should_not_filter_empty_lookup_switch() {
final MethodNode m = new MethodNode(InstrSupport.ASM_API_VERSION, 0,
"name", "(Ljava/lang/String;)V", null, null);
m.visitVarInsn(Opcodes.ALOAD, 1);
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "hashCode",
"()I", false);
final Label defaultCase = new Label();
m.visitLookupSwitchInsn(defaultCase, null, new Label[] {});
m.visitLabel(defaultCase);
m.visitInsn(Opcodes.RETURN);
filter.filter(m, context, output);
assertIgnored();
}
}
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