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
62
63
64
65
|
// Copyright 2018 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.build.android.desugar;
import java.util.ArrayList;
import java.util.Collections;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.Opcodes;
/**
* Visitor that renames emulated interfaces and marks classes that extend emulated interfaces to
* also implement the renamed interfaces. {@link DefaultMethodClassFixer} makes sure the requisite
* methods are present. Doing this helps with dynamic dispatch on emulated interfaces.
*/
public class EmulatedInterfaceRewriter extends ClassVisitor {
private final CoreLibrarySupport support;
public EmulatedInterfaceRewriter(ClassVisitor dest, CoreLibrarySupport support) {
super(Opcodes.ASM6, dest);
this.support = support;
}
@Override
public void visit(
int version,
int access,
String name,
String signature,
String superName,
String[] interfaces) {
boolean isEmulated = support.isEmulatedCoreClassOrInterface(name);
if (interfaces != null && interfaces.length > 0 && !isEmulated) {
// Make classes implementing emulated interfaces also implement the renamed interfaces we
// create below.
ArrayList<String> newInterfaces = new ArrayList<>(interfaces.length + 2);
Collections.addAll(newInterfaces, interfaces);
for (String itf : interfaces) {
if (support.isEmulatedCoreClassOrInterface(itf)) {
newInterfaces.add(support.renameCoreLibrary(itf));
}
}
if (interfaces.length != newInterfaces.size()) {
interfaces = newInterfaces.toArray(interfaces);
signature = null; // additional interfaces invalidate signature
}
}
if (BitFlags.isInterface(access) && isEmulated) {
name = support.renameCoreLibrary(name);
}
super.visit(version, access, name, signature, superName, interfaces);
}
}
|
