/*
 * Copyright (c) 2011, 2012, 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
 * @summary smoke tests for CallSite
 * @library /test/lib
 *
 * @build indify.Indify
 * @compile CallSiteTest.java
 * @run main/othervm/timeout=3600 -XX:+IgnoreUnrecognizedVMOptions -XX:-VerifyDependencies -Xbatch
 *      indify.Indify
 *      --expand-properties --classpath ${test.classes}
 *      --java test.java.lang.invoke.CallSiteTest
 */

package test.java.lang.invoke;

import java.io.*;

import java.lang.invoke.*;
import static java.lang.invoke.MethodHandles.*;
import static java.lang.invoke.MethodType.*;
import static jdk.test.lib.Asserts.*;

public class CallSiteTest {
    private static final Class<?> CLASS = CallSiteTest.class;

    private static CallSite mcs;
    private static CallSite vcs;
    private static MethodHandle mh_foo;
    private static MethodHandle mh_bar;

    static {
        try {

            mh_foo = lookup().findStatic(CLASS, "foo", methodType(int.class, int.class, int.class));
            mh_bar = lookup().findStatic(CLASS, "bar", methodType(int.class, int.class, int.class));
            mcs = new MutableCallSite(mh_foo);
            vcs = new VolatileCallSite(mh_foo);
        } catch (Exception e) {
            e.printStackTrace();
            throw new Error(e);
        }
    }

    public static void main(String... av) throws Throwable {
        testConstantCallSite();
        testMutableCallSite();
        testVolatileCallSite();
    }

    private static final int N = Integer.MAX_VALUE / 100;
    private static final int RESULT1 = 762786192;
    private static final int RESULT2 = -21474836;

    static final CallSite     MCS         = new MutableCallSite(methodType(void.class));
    static final MethodHandle MCS_INVOKER = MCS.dynamicInvoker();

    static void test(boolean shouldThrow) {
        try {
            MCS_INVOKER.invokeExact();
            if (shouldThrow) {
                throw new AssertionError("should throw");
            }
        } catch (IllegalStateException ise) {
            if (!shouldThrow) {
                throw new AssertionError("should not throw", ise);
            }
        } catch (Throwable e) {
            throw new Error(e);
        }
    }

    static class MyCCS extends ConstantCallSite {
        public MyCCS(MethodType targetType, MethodHandle createTargetHook) throws Throwable {
            super(targetType, createTargetHook);
        }
    }

    private static MethodHandle testConstantCallSiteHandler(CallSite cs, CallSite[] holder) throws Throwable {
        holder[0] = cs; // capture call site instance for subsequent checks

        MethodType csType = cs.type(); // should not throw on partially constructed instance

        // Truly dynamic invoker for constant call site
        MethodHandle getTarget = lookup().findVirtual(CallSite.class, "getTarget", MethodType.methodType(MethodHandle.class))
                                         .bindTo(cs);
        MethodHandle invoker = MethodHandles.exactInvoker(csType);
        MethodHandle target = MethodHandles.foldArguments(invoker, getTarget);

        MCS.setTarget(target);
        // warmup
        for (int i = 0; i < 20_000; i++) {
            test(true); // should throw IllegalStateException
        }

        return MethodHandles.empty(csType); // initialize cs with an empty method handle
    }

    private static void testConstantCallSite() throws Throwable {
        CallSite[] holder = new CallSite[1];
        MethodHandle handler = lookup().findStatic(CLASS, "testConstantCallSiteHandler", MethodType.methodType(MethodHandle.class, CallSite.class, CallSite[].class));
        handler = MethodHandles.insertArguments(handler, 1, new Object[] { holder } );

        CallSite ccs = new MyCCS(MCS.type(), handler); // trigger call to handler

        if (ccs != holder[0]) {
            throw new AssertionError("different call site instances");
        }
        test(false); // should not throw
    }

    private static void testMutableCallSite() throws Throwable {
        // warm-up
        for (int i = 0; i < 20000; i++) {
            mcs.setTarget(mh_foo);
        }
        // run
        for (int n = 0; n < 2; n++) {
            mcs.setTarget(mh_foo);
            for (int i = 0; i < 5; i++) {
                assertEQ(RESULT1, runMutableCallSite());
            }
            mcs.setTarget(mh_bar);
            for (int i = 0; i < 5; i++) {
                assertEQ(RESULT2, runMutableCallSite());
            }
        }
    }
    private static void testVolatileCallSite() throws Throwable {
        // warm-up
        for (int i = 0; i < 20000; i++) {
            vcs.setTarget(mh_foo);
        }
        // run
        for (int n = 0; n < 2; n++) {
            vcs.setTarget(mh_foo);
            for (int i = 0; i < 5; i++) {
                assertEQ(RESULT1, runVolatileCallSite());
            }
            vcs.setTarget(mh_bar);
            for (int i = 0; i < 5; i++) {
                assertEQ(RESULT2, runVolatileCallSite());
            }
        }
    }

    private static int runMutableCallSite() throws Throwable {
        int sum = 0;
        for (int i = 0; i < N; i++) {
            sum += (int) INDY_mcs().invokeExact(i, i+1);
        }
        return sum;
    }
    private static int runVolatileCallSite() throws Throwable {
        int sum = 0;
        for (int i = 0; i < N; i++) {
            sum += (int) INDY_vcs().invokeExact(i, i+1);
        }
        return sum;
    }

    static int foo(int a, int b) { return a + b; }
    static int bar(int a, int b) { return a - b; }

    private static MethodType MT_bsm() {
        shouldNotCallThis();
        return methodType(CallSite.class, Lookup.class, String.class, MethodType.class);
    }

    private static CallSite bsm_mcs(Lookup caller, String name, MethodType type) throws ReflectiveOperationException {
        return mcs;
    }
    private static MethodHandle MH_bsm_mcs() throws ReflectiveOperationException {
        shouldNotCallThis();
        return lookup().findStatic(lookup().lookupClass(), "bsm_mcs", MT_bsm());
    }
    private static MethodHandle INDY_mcs() throws Throwable {
        shouldNotCallThis();
        return ((CallSite) MH_bsm_mcs().invoke(lookup(), "foo", methodType(int.class, int.class, int.class))).dynamicInvoker();
    }

    private static CallSite bsm_vcs(Lookup caller, String name, MethodType type) throws ReflectiveOperationException {
        return vcs;
    }
    private static MethodHandle MH_bsm_vcs() throws ReflectiveOperationException {
        shouldNotCallThis();
        return lookup().findStatic(lookup().lookupClass(), "bsm_vcs", MT_bsm());
    }
    private static MethodHandle INDY_vcs() throws Throwable {
        shouldNotCallThis();
        return ((CallSite) MH_bsm_vcs().invoke(lookup(), "foo", methodType(int.class, int.class, int.class))).dynamicInvoker();
    }

    private static void shouldNotCallThis() {
        // if this gets called, the transformation has not taken place
        throw new AssertionError("this code should be statically transformed away by Indify");
    }
}