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/*
* Copyright (c) 2021, 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 8268748
* @summary Javac generates error opcodes when using nest pattern variables
* @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 NestedPatternVariablesBytecode
*/
import java.nio.file.Path;
import java.util.Arrays;
import java.util.List;
import java.util.stream.StreamSupport;
import java.lang.classfile.*;
import java.lang.classfile.attribute.CodeAttribute;
import toolbox.JavacTask;
import toolbox.TestRunner;
import toolbox.ToolBox;
public class NestedPatternVariablesBytecode 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 NestedPatternVariablesBytecode() {
super(System.err);
tb = new ToolBox();
}
public static void main(String[] args) throws Exception {
NestedPatternVariablesBytecode t = new NestedPatternVariablesBytecode();
t.runTests();
}
@Test
public void testNestedPatternVariablesBytecode() throws Exception {
String code = """
class NestedPatterVariablesTest {
String test(Object o) {
if (o instanceof CharSequence cs && cs instanceof String s) {
return s;
}
return null;
}
}""";
Path curPath = Path.of(".");
new JavacTask(tb)
.sources(code)
.outdir(curPath)
.run();
cf = ClassFile.of().parse(curPath.resolve("NestedPatterVariablesTest.class"));
MethodModel testMethod = cf.methods().stream()
.filter(this::isTestMethod)
.findAny()
.orElseThrow();
CodeAttribute code_attribute = testMethod.findAttribute(Attributes.code()).orElseThrow();
List<String> actualCode = getCodeInstructions(code_attribute);
List<String> expectedCode = Arrays.asList(
"ALOAD_1", "INSTANCEOF", "IFEQ", "ALOAD_1", "CHECKCAST", "ASTORE_2", "ALOAD_2", "INSTANCEOF",
"IFEQ", "ALOAD_2", "CHECKCAST", "ASTORE_3", "ALOAD_3", "ARETURN", "ACONST_NULL", "ARETURN");
tb.checkEqual(expectedCode, actualCode);
}
boolean isTestMethod(MethodModel m) {
return m.methodName().equalsString(TEST_METHOD);
}
List<String> getCodeInstructions(CodeAttribute code) {
return code.elementList().stream()
.filter(ce -> ce instanceof Instruction)
.map(ins -> ((Instruction) ins).opcode().name())
.toList();
}
}
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