jdk

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/*
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 * Copyright (c) 2008, 2015, 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 6716452
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 * @summary need a method to get an index of an attribute
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 * @enablePreview
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 */
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import java.io.*;
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import java.nio.file.Files;
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import java.lang.classfile.*;
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import java.lang.classfile.attribute.*;
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public class T6716452 {
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    public static void main(String[] args) throws Exception {
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        new T6716452().run();
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    }
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    public void run() throws Exception {
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        File javaFile = writeTestFile();
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        File classFile = compileTestFile(javaFile);
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        ClassModel cm = ClassFile.of().parse(classFile.toPath());
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        for (MethodModel mm: cm.methods()) {
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            test(mm);
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        }
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        if (errors > 0)
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            throw new Exception(errors + " errors found");
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    }
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    void test(MethodModel mm) {
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        test(mm, Attributes.code(), CodeAttribute.class);
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        test(mm, Attributes.exceptions(), ExceptionsAttribute.class);
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    }
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    // test the result of MethodModel.findAttribute, MethodModel.attributes().indexOf() according to expectations
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    // encoded in the method's name
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    <T extends Attribute<T>> void test(MethodModel mm, AttributeMapper<T> attr, Class<?> c) {
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        Attribute<T> attr_instance = mm.findAttribute(attr).orElse(null);
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        int index = mm.attributes().indexOf(attr_instance);
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        String mm_name = mm.methodName().stringValue();
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        System.err.println("Method " + mm_name + " name:" + attr.name() + " index:" + index + " class: " + c);
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        boolean expect = (mm_name.equals("<init>") && attr.name().equals("Code"))
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                || (mm_name.contains(attr.name()));
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        boolean found = (index != -1);
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        if (expect) {
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            if (found) {
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                if (!c.isAssignableFrom(mm.attributes().get(index).getClass())) {
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                    error(mm + ": unexpected attribute found,"
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                            + " expected " + c.getName()
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                            + " found " + mm.attributes().get(index).attributeName());
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                }
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            } else {
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                error(mm + ": expected attribute " + attr.name() + " not found");
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            }
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        } else {
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            if (found) {
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                error(mm + ": unexpected attribute " + attr.name());
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            }
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        }
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    }
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    File writeTestFile() throws IOException {
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        File f = new File("Test.java");
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        PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(f)));
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        out.println("abstract class Test { ");
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        out.println("  abstract void m();");
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        out.println("  void m_Code() { }");
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        out.println("  abstract void m_Exceptions() throws Exception;");
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        out.println("  void m_Code_Exceptions() throws Exception { }");
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        out.println("}");
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        out.close();
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        return f;
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    }
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    File compileTestFile(File f) {
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        int rc = com.sun.tools.javac.Main.compile(new String[] { "-g", f.getPath() });
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        if (rc != 0)
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            throw new Error("compilation failed. rc=" + rc);
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        String path = f.getPath();
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        return new File(path.substring(0, path.length() - 5) + ".class");
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    }
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    void error(String msg) {
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        System.err.println("error: " + msg);
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        errors++;
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    }
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    int errors;
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}
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