/*

 * Copyright (c) 2013, 2015, 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.

 *

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 */

/*

 * @test

 * @bug 6970173

 * @summary Debug pointer at bad position

 * @library /tools/lib

 *          jdk.compiler/com.sun.tools.javac.api

 *          jdk.compiler/com.sun.tools.javac.file

 *          jdk.compiler/com.sun.tools.javac.main

 *          jdk.compiler/com.sun.tools.javac.util

 * @build ToolBox

 * @run main DebugPointerAtBadPositionTest

 */

import java.io.File;

import java.nio.file.Paths;

import com.sun.tools.classfile.ClassFile;

import com.sun.tools.classfile.Code_attribute;

import com.sun.tools.classfile.LineNumberTable_attribute;

import com.sun.tools.classfile.Method;

import com.sun.tools.javac.util.Assert;

public class DebugPointerAtBadPositionTest {

    static final String testSource =

            "public class AssertionTest {\n" +

            "    void lookForThisMethod() {\n" +

            "        int i;\n" +

            "        i = 33;\n" +

            "        assert // line 5\n" +

            "            i < 89:\n" +

            "        i < 100; // line 7\n" +

            "    }\n" +

            "}";

    static final int[][] expectedLNT = {

        {4, 0},

        {5, 3},

        {8, 34}

    };

    static final String methodToLookFor = "lookForThisMethod";

    static final String seekMethodNotFoundMsg =

        "The seek method was not found";

    static final String foundLNTLengthDifferentThanExpMsg =

        "The LineNumberTable found has a length different to the expected one";

    public static void main(String[] args) throws Exception {

        new DebugPointerAtBadPositionTest().run();

    }

    void run() throws Exception {

        compileTestClass();

        checkClassFile(new File(Paths.get(System.getProperty("user.dir"),

                "AssertionTest.class").toUri()), methodToLookFor);

    }

    void compileTestClass() throws Exception {

        ToolBox tb = new ToolBox();

        tb.new JavacTask()

                .sources(testSource)

                .run();

    }

    void checkClassFile(final File cfile, String methodToFind) throws Exception {

        ClassFile classFile = ClassFile.read(cfile);

        boolean methodFound = false;

        for (Method method : classFile.methods) {

            if (method.getName(classFile.constant_pool).equals(methodToFind)) {

                methodFound = true;

                Code_attribute code = (Code_attribute) method.attributes.get("Code");

                LineNumberTable_attribute lnt =

                        (LineNumberTable_attribute) code.attributes.get("LineNumberTable");

                Assert.check(lnt.line_number_table_length == expectedLNT.length,

                        foundLNTLengthDifferentThanExpMsg);

                int i = 0;

                for (LineNumberTable_attribute.Entry entry: lnt.line_number_table) {

                    Assert.check(entry.line_number == expectedLNT[i][0] &&

                            entry.start_pc == expectedLNT[i][1],

                            "LNT entry at pos " + i + " differ from expected." +

                            "Found " + entry.line_number + ":" + entry.start_pc +

                            ". Expected " + expectedLNT[i][0] + ":" + expectedLNT[i][1]);

                    i++;

                }

            }

        }

        Assert.check(methodFound, seekMethodNotFoundMsg);

    }

    void error(String msg) {

        throw new AssertionError(msg);

    }

}