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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 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 StringSwitchJavacFilter}.
*/
public class StringSwitchJavacFilterTest extends FilterTestBase {
private final IFilter filter = new StringSwitchJavacFilter();
private final MethodNode m = new MethodNode(InstrSupport.ASM_API_VERSION, 0,
"name", "()V", null, null);
private AbstractInsnNode expectedFromInclusive;
private AbstractInsnNode expectedToInclusive;
private void createFirstSwitch() {
final Label h1 = new Label();
final Label h1_2 = new Label();
final Label h2 = new Label();
final Label secondSwitch = new Label();
m.visitInsn(Opcodes.ICONST_M1);
m.visitVarInsn(Opcodes.ISTORE, 2);
m.visitVarInsn(Opcodes.ALOAD, 1);
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "hashCode",
"()I", false);
m.visitLookupSwitchInsn(secondSwitch, new int[] { 97, 98 },
new Label[] { h1, h2 });
expectedFromInclusive = m.instructions.getLast();
m.visitLabel(h1);
m.visitVarInsn(Opcodes.ALOAD, 1);
m.visitLdcInsn("a");
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals",
"(Ljava/lang/Object;)Z", false);
// if not equal "a", then goto next comparison
m.visitJumpInsn(Opcodes.IFEQ, h1_2);
m.visitInsn(Opcodes.ICONST_0);
m.visitVarInsn(Opcodes.ISTORE, 2);
// goto secondSwitch
m.visitJumpInsn(Opcodes.GOTO, secondSwitch);
m.visitLabel(h1_2);
m.visitVarInsn(Opcodes.ALOAD, 1);
m.visitLdcInsn("\0a");
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals",
"(Ljava/lang/Object;)Z", false);
// if not equal "\0a", then goto second switch
m.visitJumpInsn(Opcodes.IFEQ, secondSwitch);
m.visitInsn(Opcodes.ICONST_1);
m.visitVarInsn(Opcodes.ISTORE, 2);
// goto secondSwitch
m.visitJumpInsn(Opcodes.GOTO, secondSwitch);
m.visitLabel(h2);
m.visitVarInsn(Opcodes.ALOAD, 1);
m.visitLdcInsn("b");
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals",
"(Ljava/lang/Object;)Z", false);
// if not equal "b", then goto second switch
m.visitJumpInsn(Opcodes.IFEQ, secondSwitch);
m.visitInsn(Opcodes.ICONST_2);
m.visitVarInsn(Opcodes.ISTORE, 2);
m.visitLabel(secondSwitch);
expectedToInclusive = m.instructions.getLast();
m.visitVarInsn(Opcodes.ILOAD, 2);
}
@Test
public void should_filter_code_generated_by_javac() {
createFirstSwitch();
final Label cases = new Label();
m.visitTableSwitchInsn(0, 2, cases);
m.visitLabel(cases);
filter.filter(m, context, output);
assertIgnored(new Range(expectedFromInclusive, expectedToInclusive));
}
@Test
public void should_filter_when_javac_generates_lookupswitch() {
createFirstSwitch();
final Label cases = new Label();
m.visitLookupSwitchInsn(cases, null, new Label[] {});
m.visitLabel(cases);
filter.filter(m, context, output);
assertIgnored(new Range(expectedFromInclusive, expectedToInclusive));
}
@Test
public void should_not_filter_code_generated_by_ECJ() {
final Label h1 = new Label();
final Label h2 = new Label();
final Label cases = new Label();
m.visitVarInsn(Opcodes.ALOAD, 1);
m.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "hashCode",
"()I", false);
m.visitTableSwitchInsn(0, 2, cases, h1, h2);
m.visitLabel(h1);
m.visitVarInsn(Opcodes.ALOAD, 1);
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, cases);
m.visitVarInsn(Opcodes.ALOAD, 1);
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, cases);
// goto default case
m.visitJumpInsn(Opcodes.GOTO, cases);
m.visitLabel(h2);
m.visitVarInsn(Opcodes.ALOAD, 1);
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, cases);
// goto default case
m.visitJumpInsn(Opcodes.GOTO, cases);
m.visitLabel(cases);
filter.filter(m, context, output);
assertIgnored();
}
}
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