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/*
* Copyright (c) 2021, 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 8264306
* @summary Verify patterns are desugaring in a reproducible manner
* @library /tools/lib /tools/javac/lib
* @modules
* jdk.compiler/com.sun.tools.javac.api
* jdk.compiler/com.sun.tools.javac.file
* jdk.compiler/com.sun.tools.javac.main
* jdk.compiler/com.sun.tools.javac.util
* @build toolbox.ToolBox toolbox.JavacTask
* @compile StablePatternDesugaring.java
* @run main StablePatternDesugaring
*/
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Arrays;
import toolbox.ToolBox;
import toolbox.JavacTask;
public class StablePatternDesugaring {
protected ToolBox tb;
StablePatternDesugaring() {
tb = new ToolBox();
}
public static void main(String... args) throws Exception {
new StablePatternDesugaring().run();
}
void run() throws Exception {
String code = """
public class T {
private boolean t(Object o) {
if (o instanceof String s) {
return s.isEmpty();
} else if (o instanceof CharSequence cs) {
return cs.isEmpty();
} else if (o instanceof Integer i) {
return i != 0;
} else if (o instanceof Float f) {
return f != 0;
} else {
return false;
}
}
}
""";
Path base = Paths.get(".");
Path src = base.resolve("src");
tb.writeJavaFiles(src, code);
Path classes1 = base.resolve("classes1");
if (Files.isDirectory(classes1)) {
tb.cleanDirectory(classes1);
} else {
Files.createDirectories(classes1);
}
new JavacTask(tb)
.files(tb.findJavaFiles(src))
.outdir(classes1)
.run()
.writeAll();
byte[] expected = Files.readAllBytes(classes1.resolve("T.class"));
for (int i = 0; i < 10; i++) {
Path classes2 = base.resolve("classes2");
if (Files.isDirectory(classes2)) {
tb.cleanDirectory(classes2);
} else {
Files.createDirectories(classes2);
}
new JavacTask(tb)
.files(tb.findJavaFiles(src))
.outdir(classes2)
.run()
.writeAll();
byte[] actual = Files.readAllBytes(classes2.resolve("T.class"));
if (!Arrays.equals(expected, actual)) {
throw new AssertionError("Classfiles differ!");
}
}
}
}
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