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/*
* Copyright (c) 2014, 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8067422
* @summary Check that the lambda names are not unnecessarily unstable
* @library /tools/lib
* @modules jdk.compiler/com.sun.tools.javac.api
* jdk.compiler/com.sun.tools.javac.main
* jdk.jdeps/com.sun.tools.javap
* @build toolbox.ToolBox toolbox.JavacTask
* @run main TestNonSerializableLambdaNameStability
*/
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import javax.tools.StandardLocation;
import java.lang.classfile.*;
import toolbox.JavacTask;
import toolbox.ToolBox;
public class TestNonSerializableLambdaNameStability {
public static void main(String... args) throws Exception {
new TestNonSerializableLambdaNameStability().run();
}
String lambdaSource = "public class L%d {\n" +
" public static class A {\n" +
" private Runnable r = () -> { };\n" +
" }\n" +
" public static class B {\n" +
" private Runnable r = () -> { };\n" +
" }\n" +
" private Runnable r = () -> { };\n" +
"}\n";
String expectedLambdaMethodName = "lambda$new$0";
void run() throws Exception {
List<String> sources = new ArrayList<>();
for (int i = 0; i < 3; i++) {
sources.add(String.format(lambdaSource, i));
}
ToolBox tb = new ToolBox();
try (ToolBox.MemoryFileManager fm = new ToolBox.MemoryFileManager()) {
new JavacTask(tb)
.sources(sources.toArray(new String[sources.size()]))
.fileManager(fm)
.run();
for (String file : fm.getFileNames(StandardLocation.CLASS_OUTPUT)) {
byte[] fileBytes = fm.getFileBytes(StandardLocation.CLASS_OUTPUT, file);
try (InputStream in = new ByteArrayInputStream(fileBytes)) {
boolean foundLambdaMethod = false;
ClassModel cf = ClassFile.of().parse(in.readAllBytes());
StringBuilder seenMethods = new StringBuilder();
String sep = "";
for (MethodModel m : cf.methods()) {
String methodName = m.methodName().stringValue();
if (expectedLambdaMethodName.equals(methodName)) {
foundLambdaMethod = true;
break;
}
seenMethods.append(sep);
seenMethods.append(methodName);
sep = ", ";
}
if (!foundLambdaMethod) {
throw new AbstractMethodError("Did not find the lambda method, " +
"found methods: " + seenMethods.toString());
}
}
}
}
}
}
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