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/*
* Copyright (c) 2022, 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 8297118
* @summary Verify javac uses MatchException or IncompatibleClassChangeError for exhaustive switches
* @library /tools/lib
* @modules jdk.compiler/com.sun.tools.javac.api
* jdk.compiler/com.sun.tools.javac.main
* @build toolbox.ToolBox toolbox.JavacTask
* @run main MatchExceptionTest
*/
import java.nio.file.Path;
import java.lang.classfile.*;
import java.lang.classfile.constantpool.ClassEntry;
import java.lang.classfile.constantpool.ConstantPool;
import java.lang.classfile.constantpool.PoolEntry;
import java.util.Arrays;
import toolbox.JavacTask;
import toolbox.TestRunner;
import toolbox.ToolBox;
public class MatchExceptionTest extends TestRunner {
private static final String JAVA_VERSION = System.getProperty("java.specification.version");
private static final String TEST_METHOD = "test";
ToolBox tb;
ClassModel cf;
public MatchExceptionTest() {
super(System.err);
tb = new ToolBox();
}
public static void main(String[] args) throws Exception {
MatchExceptionTest t = new MatchExceptionTest();
t.runTests();
}
@Test
public void testNestedPatternVariablesBytecode() throws Exception {
String codeStatement = """
class Test {
void test(E e) {
switch (e) {
case null -> {}
case S -> {}
};
}
enum E { S; }
}""";
String codeExpression = """
class Test {
int test(E e) {
return switch (e) {
case S -> 0;
};
}
enum E { S; }
}""";
record Setup(boolean hasMatchException, String... options) {
public String toString() {
return "Setup[hasMatchException=" + hasMatchException +
", options=" + Arrays.toString(options) + "]";
}
}
Setup[] variants = new Setup[] {
new Setup(false, "--release", "20"),
new Setup(true),
};
record Source(String source, boolean needs21) {}
Source[] sources = new Source[] {
new Source(codeStatement, true),
new Source(codeExpression, false),
};
Path curPath = Path.of(".");
for (Source source : sources) {
for (Setup variant : variants) {
if (source.needs21 &&
!Arrays.asList(variant.options).contains("21")) {
continue;
}
new JavacTask(tb)
.options(variant.options)
.sources(source.source)
.outdir(curPath)
.run();
cf = ClassFile.of().parse(curPath.resolve("Test.class"));
boolean incompatibleClassChangeErrror = false;
boolean matchException = false;
for (PoolEntry pe : cf.constantPool()) {
if (pe instanceof ClassEntry clazz) {
incompatibleClassChangeErrror |= clazz.name().equalsString(
"java/lang/IncompatibleClassChangeError");
matchException |= clazz.name().equalsString("java/lang/MatchException");
}
}
if (variant.hasMatchException) {
assertTrue("Expected MatchException (" + variant + ")", matchException);
assertTrue("Did not expect IncompatibleClassChangeError (" + variant + ")",
!incompatibleClassChangeErrror);
} else {
assertTrue("Did not expect MatchException (" + variant + ")", !matchException);
assertTrue("Expected IncompatibleClassChangeError (" + variant + ")",
incompatibleClassChangeErrror);
}
}
}
}
void assertTrue(String message, boolean b) {
if (!b) {
throw new AssertionError(message);
}
}
}
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