/*
* Copyright (c) 2014, 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 8058243
* @summary Reduce size of bytecode for large switch statements
* @library /tools/lib
* @build ToolBox
* @run main SwitchMetricTest
*/
import java.net.URL;
import java.util.List;
public class SwitchMetricTest {
public static void main(String... args) throws Exception {
new SwitchMetricTest().run();
}
// This code should produce a tableswitch
class Test1 {
int m(int x) {
switch (x) {
case 1:
case 2:
case 3:
case 4:
case 5: return 1;
default: return 0;
}
}
}
// This code should produce a lookupswitch
class Test2 {
int m(int x) {
switch (x) {
case 1:
case 2:
case 3:
case 4:
case 50: return 1;
default: return 0;
}
}
}
void check(String classfile, String bytecode) throws Exception {
ToolBox tb = new ToolBox();
URL url = SwitchMetricTest.class.getResource(classfile);
List<String> result = tb.new JavapTask()
.options("-c")
.classes(url.getFile())
.run()
.write(ToolBox.OutputKind.DIRECT)
.getOutputLines(ToolBox.OutputKind.DIRECT);
List<String> matches = tb.grep(bytecode, result);
if (matches.isEmpty())
throw new Exception(bytecode + " not found");
}
void run() throws Exception {
check("SwitchMetricTest$Test1.class", "tableswitch");
check("SwitchMetricTest$Test2.class", "lookupswitch");
}
}