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StringSwitchFilterTest.java
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/
StringSwitchFilterTest.java
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/*******************************************************************************
* Copyright (c) 2009, 2021 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 StringSwitchFilter}.
*/
public class StringSwitchFilterTest extends FilterTestBase {
private final IFilter filter = new StringSwitchFilter();
@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 case1 = new Label();
final Label case2 = new Label();
final Label case3 = new Label();
final Label caseDefault = new Label();
final Label h1 = new Label();
final Label h2 = new Label();
// filter should not remember this unrelated slot
m.visitLdcInsn("");
m.visitVarInsn(Opcodes.ASTORE, 1);
m.visitVarInsn(Opcodes.ALOAD, 1);
// switch (...)
m.visitInsn(Opcodes.DUP);
m.visitVarInsn(Opcodes.ASTORE, 2);
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "hashCode",
"()I", false);
m.visitTableSwitchInsn(97, 98, caseDefault, h1, h2);
final AbstractInsnNode switchNode = m.instructions.getLast();
m.visitLabel(h1);
m.visitVarInsn(Opcodes.ALOAD, 2);
m.visitLdcInsn("a");
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals",
"(Ljava/lang/Object;)Z", false);
// if equal "a", then goto its case
m.visitJumpInsn(Opcodes.IFNE, case1);
m.visitVarInsn(Opcodes.ALOAD, 2);
m.visitLdcInsn("\0a");
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals",
"(Ljava/lang/Object;)Z", false);
// if equal "\0a", then goto its case
m.visitJumpInsn(Opcodes.IFNE, case2);
// goto default case
m.visitJumpInsn(Opcodes.GOTO, caseDefault);
m.visitLabel(h2);
m.visitVarInsn(Opcodes.ALOAD, 2);
m.visitLdcInsn("b");
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals",
"(Ljava/lang/Object;)Z", false);
// if equal "b", then goto its case
m.visitJumpInsn(Opcodes.IFNE, case3);
// goto default case
m.visitJumpInsn(Opcodes.GOTO, caseDefault);
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(caseDefault);
m.visitInsn(Opcodes.RETURN);
expectedNewTargets.add(m.instructions.getLast());
filter.filter(m, context, output);
assertReplacedBranches(switchNode, expectedNewTargets);
assertIgnored(new Range(switchNode.getNext(), expectedToInclusive));
}
@Test
public void should_filter_when_default_is_first() {
final Set<AbstractInsnNode> expectedNewTargets = new HashSet<AbstractInsnNode>();
final MethodNode m = new MethodNode(InstrSupport.ASM_API_VERSION, 0,
"name", "()V", null, null);
final Label case1 = new Label();
final Label caseDefault = new Label();
final Label h1 = new Label();
// filter should not remember this unrelated slot
m.visitLdcInsn("");
m.visitVarInsn(Opcodes.ASTORE, 1);
m.visitVarInsn(Opcodes.ALOAD, 1);
// switch (...)
m.visitInsn(Opcodes.DUP);
m.visitVarInsn(Opcodes.ASTORE, 2);
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "hashCode",
"()I", false);
m.visitLookupSwitchInsn(caseDefault, new int[] { 97 },
new Label[] { h1 });
final AbstractInsnNode switchNode = m.instructions.getLast();
m.visitLabel(h1);
m.visitVarInsn(Opcodes.ALOAD, 2);
m.visitLdcInsn("a");
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals",
"(Ljava/lang/Object;)Z", false);
// if equal "a", then goto its case
m.visitJumpInsn(Opcodes.IFNE, case1);
final AbstractInsnNode expectedToInclusive = m.instructions.getLast();
m.visitLabel(caseDefault);
m.visitInsn(Opcodes.RETURN);
expectedNewTargets.add(m.instructions.getLast());
m.visitLabel(case1);
m.visitInsn(Opcodes.RETURN);
expectedNewTargets.add(m.instructions.getLast());
filter.filter(m, context, output);
assertReplacedBranches(switchNode, expectedNewTargets);
assertIgnored(new Range(switchNode.getNext(), expectedToInclusive));
}
/**
* <pre>
* fun example(p: String) {
* when (p) {
* "a" -> return
* "\u0000a" -> return
* "b" -> return
* "\u0000b" -> return
* "c" -> return
* "\u0000c" -> return
* }
* }
* </pre>
*/
@Test
public void should_filter_Kotlin_1_5() {
final Set<AbstractInsnNode> expectedNewTargets = new HashSet<AbstractInsnNode>();
final MethodNode m = new MethodNode(InstrSupport.ASM_API_VERSION, 0,
"example", "()V", null, null);
final Label h1 = new Label();
final Label h2 = new Label();
final Label h3 = new Label();
final Label defaultCase = new Label();
final Label case1 = new Label();
final Label case2 = new Label();
final Label case3 = new Label();
final Label case4 = new Label();
final Label case5 = new Label();
final Label case6 = new Label();
m.visitVarInsn(Opcodes.ALOAD, 1);
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "hashCode",
"()I", false);
m.visitTableSwitchInsn(97, 99, defaultCase, h1, h2, h3);
m.visitLabel(h1);
final AbstractInsnNode expectedFromInclusive = m.instructions.getLast();
m.visitVarInsn(Opcodes.ALOAD, 1);
m.visitLdcInsn("a");
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals",
"(Ljava/lang/Object;)Z", false);
m.visitJumpInsn(Opcodes.IFNE, case1);
m.visitVarInsn(Opcodes.ALOAD, 1);
m.visitLdcInsn("\u0000a");
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals",
"(Ljava/lang/Object;)Z", false);
m.visitJumpInsn(Opcodes.IFNE, case2);
m.visitJumpInsn(Opcodes.GOTO, defaultCase);
m.visitLabel(h2);
m.visitVarInsn(Opcodes.ALOAD, 1);
m.visitLdcInsn("b");
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals",
"(Ljava/lang/Object;)Z", false);
m.visitJumpInsn(Opcodes.IFNE, case3);
m.visitVarInsn(Opcodes.ALOAD, 1);
m.visitLdcInsn("\u0000b");
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals",
"(Ljava/lang/Object;)Z", false);
m.visitJumpInsn(Opcodes.IFNE, case4);
m.visitJumpInsn(Opcodes.GOTO, defaultCase);
m.visitLabel(h3);
m.visitVarInsn(Opcodes.ALOAD, 1);
m.visitLdcInsn("c");
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals",
"(Ljava/lang/Object;)Z", false);
m.visitJumpInsn(Opcodes.IFNE, case5);
m.visitVarInsn(Opcodes.ALOAD, 1);
m.visitLdcInsn("\u0000c");
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals",
"(Ljava/lang/Object;)Z", false);
m.visitJumpInsn(Opcodes.IFNE, case6);
m.visitJumpInsn(Opcodes.GOTO, 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(case4);
m.visitInsn(Opcodes.RETURN);
expectedNewTargets.add(m.instructions.getLast());
m.visitLabel(case5);
m.visitInsn(Opcodes.RETURN);
expectedNewTargets.add(m.instructions.getLast());
m.visitLabel(case6);
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.visitVarInsn(Opcodes.ASTORE, 2);
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();
}
}