108 lines
3.9 KiB
Java
108 lines
3.9 KiB
Java
/*
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* Copyright (c) 2021, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8268748
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* @summary Javac generates error opcodes when using nest pattern variables
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* @library /tools/lib
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* @enablePreview
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* @modules jdk.compiler/com.sun.tools.javac.api
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* jdk.compiler/com.sun.tools.javac.main
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* java.base/jdk.internal.classfile.impl
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* @build toolbox.ToolBox toolbox.JavacTask
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* @run main NestedPatternVariablesBytecode
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*/
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import java.nio.file.Path;
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import java.util.Arrays;
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import java.util.List;
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import java.util.stream.StreamSupport;
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import java.lang.classfile.*;
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import java.lang.classfile.attribute.CodeAttribute;
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import toolbox.JavacTask;
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import toolbox.TestRunner;
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import toolbox.ToolBox;
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public class NestedPatternVariablesBytecode extends TestRunner {
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private static final String JAVA_VERSION = System.getProperty("java.specification.version");
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private static final String TEST_METHOD = "test";
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ToolBox tb;
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ClassModel cf;
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public NestedPatternVariablesBytecode() {
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super(System.err);
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tb = new ToolBox();
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}
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public static void main(String[] args) throws Exception {
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NestedPatternVariablesBytecode t = new NestedPatternVariablesBytecode();
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t.runTests();
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}
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@Test
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public void testNestedPatternVariablesBytecode() throws Exception {
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String code = """
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class NestedPatterVariablesTest {
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String test(Object o) {
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if (o instanceof CharSequence cs && cs instanceof String s) {
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return s;
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}
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return null;
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}
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}""";
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Path curPath = Path.of(".");
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new JavacTask(tb)
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.sources(code)
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.outdir(curPath)
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.run();
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cf = ClassFile.of().parse(curPath.resolve("NestedPatterVariablesTest.class"));
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MethodModel testMethod = cf.methods().stream()
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.filter(this::isTestMethod)
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.findAny()
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.orElseThrow();
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CodeAttribute code_attribute = testMethod.findAttribute(Attributes.code()).orElseThrow();
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List<String> actualCode = getCodeInstructions(code_attribute);
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List<String> expectedCode = Arrays.asList(
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"ALOAD_1", "INSTANCEOF", "IFEQ", "ALOAD_1", "CHECKCAST", "ASTORE_2", "ALOAD_2", "INSTANCEOF",
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"IFEQ", "ALOAD_2", "CHECKCAST", "ASTORE_3", "ALOAD_3", "ARETURN", "ACONST_NULL", "ARETURN");
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tb.checkEqual(expectedCode, actualCode);
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}
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boolean isTestMethod(MethodModel m) {
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return m.methodName().equalsString(TEST_METHOD);
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}
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List<String> getCodeInstructions(CodeAttribute code) {
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return code.elementList().stream()
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.filter(ce -> ce instanceof Instruction)
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.map(ins -> ((Instruction) ins).opcode().name())
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.toList();
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}
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}
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