blob: 4a39d1e8205092f63e816b0942b31ab351df27d9 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
/*******************************************************************************
* Copyright (c) 2009, 2019 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.internal.analysis.filter;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.MethodNode;
/**
* Filters empty enum constructors.
*
* Constructor of enum is invoked from static initialization block to create
* instance of each enum constant. So it won't be executed if number of enum
* constants is zero. Such enums are sometimes used as alternative to classes
* with static utilities and private empty constructor. Implicit constructor of
* enum created by compiler doesn't have a synthetic flag and refers to a line
* of enum definition. Therefore in order to not have partial coverage of enum
* definition line in enums without enum constants and similarly to
* {@link PrivateEmptyNoArgConstructorFilter filter of private empty
* constructors} - empty constructor in enums without additional parameters
* should be filtered out even if it is not implicit.
*/
public final class EnumEmptyConstructorFilter implements IFilter {
private static final String CONSTRUCTOR_NAME = "<init>";
private static final String CONSTRUCTOR_DESC = "(Ljava/lang/String;I)V";
private static final String ENUM_TYPE = "java/lang/Enum";
public void filter(final MethodNode methodNode,
final IFilterContext context, final IFilterOutput output) {
if (ENUM_TYPE.equals(context.getSuperClassName())
&& CONSTRUCTOR_NAME.equals(methodNode.name)
&& CONSTRUCTOR_DESC.equals(methodNode.desc)
&& new Matcher().match(methodNode)) {
output.ignore(methodNode.instructions.getFirst(),
methodNode.instructions.getLast());
}
}
private static class Matcher extends AbstractMatcher {
private boolean match(final MethodNode methodNode) {
firstIsALoad0(methodNode);
nextIs(Opcodes.ALOAD);
nextIs(Opcodes.ILOAD);
nextIsInvoke(Opcodes.INVOKESPECIAL, ENUM_TYPE, CONSTRUCTOR_NAME,
CONSTRUCTOR_DESC);
nextIs(Opcodes.RETURN);
return cursor != null;
}
}
}
|
