/*

 * Copyright (c) 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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/*

 * @test

 * @bug 8136421

 * @requires (vm.simpleArch == "x64" | vm.simpleArch == "sparcv9" | vm.simpleArch == "aarch64")

 * @library / /testlibrary /test/lib

 * @library ../common/patches

 * @modules java.base/jdk.internal.misc

 * @modules java.base/jdk.internal.org.objectweb.asm

 *          java.base/jdk.internal.org.objectweb.asm.tree

 *          jdk.vm.ci/jdk.vm.ci.hotspot

 *          jdk.vm.ci/jdk.vm.ci.code

 *          jdk.vm.ci/jdk.vm.ci.meta

 * @build jdk.vm.ci/jdk.vm.ci.hotspot.CompilerToVMHelper

 * @build compiler.jvmci.compilerToVM.GetSymbolTest

 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI

 *                  compiler.jvmci.compilerToVM.GetSymbolTest

 */

package compiler.jvmci.compilerToVM;

import compiler.jvmci.common.CTVMUtilities;

import compiler.jvmci.common.testcases.SingleImplementer;

import java.lang.reflect.Field;

import java.lang.reflect.Member;

import java.lang.reflect.Method;

import java.util.ArrayList;

import java.util.List;

import java.util.function.Function;

import java.util.stream.Collectors;

import java.util.stream.Stream;

public class GetSymbolTest {

    private static final int CONSTANT_POOL_UTF8_TAG = 1; // see jvms, section 4.4

    private static final Function<Member[], List<String>> NAMES = members ->

            Stream.of(members)

                    .map(Member::getName)

                    .collect(Collectors.toList());

    public static void main(String[] args) {

        new GetSymbolTest().test(SingleImplementer.class);

    }

    private void test(Class<?> aClass) {

        Utils.ensureClassIsLoaded(aClass);

        Method method;

        try {

            method = aClass.getDeclaredMethod("nonInterfaceMethod");

        } catch (NoSuchMethodException e) {

            throw new Error("TEST BUG: can't find test method", e);

        }

        HotSpotResolvedJavaMethod resolvedMethod

                = CTVMUtilities.getResolvedMethod(aClass, method);

        List<String> symbols;

        try {

            symbols = getSymbols(resolvedMethod);

        } catch (ReflectiveOperationException e) {

            throw new Error("TEST BUG: can't access private members", e);

        }

        List<String> classSymbols = new ArrayList<>();

        classSymbols.addAll(NAMES.apply(aClass.getDeclaredFields()));

        classSymbols.addAll(NAMES.apply(aClass.getDeclaredMethods()));

        // Check that all members of test class have symbols from constant pool

        for (String s : classSymbols) {

            if (!symbols.contains(s)) {

                // failed. print all symbols found by getSymbol

                System.out.println("getSymbol data:");

                for (String ctvmValue : symbols) {

                    System.out.println(ctvmValue);

                }

                throw new AssertionError("Unable to find symbol " + s

                        + " using CompilerToVM.getSymbol");

            }

        }

    }

    private List<String> getSymbols(HotSpotResolvedJavaMethod

            metaspaceMethod) throws ReflectiveOperationException {

        List<String> symbols = new ArrayList<>();

        ConstantPool pool = metaspaceMethod.getConstantPool();

        long length = pool.length();

        // jvms-4.1: The constant_pool table is indexed from 1 ...

        for (int i = 1; i < length; i++) {

            if (getTag(pool, i) == CONSTANT_POOL_UTF8_TAG) {

                long entryPointer;

                Method getEntryAt = pool.getClass()

                        .getDeclaredMethod("getEntryAt", int.class);

                getEntryAt.setAccessible(true);

                entryPointer = (Long) getEntryAt.invoke(pool, i);

                String symbol = CompilerToVMHelper.getSymbol(entryPointer);

                symbols.add(symbol);

            }

        }

        return symbols;

    }

    private int getTag(ConstantPool pool, int index)

            throws ReflectiveOperationException {

        Object jvmConstant;

        Method getTag = pool.getClass().getDeclaredMethod("getTagAt",

                int.class);

        getTag.setAccessible(true);

        jvmConstant = getTag.invoke(pool, index);

        Field tagCode = jvmConstant.getClass().getDeclaredField("tag");

        tagCode.setAccessible(true);

        return tagCode.getInt(jvmConstant);

    }

}