JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2017, 2018, 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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package org.graalvm.compiler.hotspot.test;

import org.graalvm.compiler.hotspot.meta.HotSpotUnsafeSubstitutions;
import org.graalvm.compiler.replacements.test.MethodSubstitutionTest;
import org.junit.Test;

import jdk.vm.ci.code.InstalledCode;
import jdk.vm.ci.meta.ResolvedJavaMethod;
import sun.misc.Unsafe;

/**
 * Tests the VM independent intrinsification of {@link Unsafe} methods.
 */
public class HotSpotUnsafeSubstitutionTest extends MethodSubstitutionTest {

    public void testSubstitution(String testMethodName, Class<?> holder, String methodName, Class<?>[] parameterTypes, Object receiver, Object[] args1, Object[] args2) {
        ResolvedJavaMethod testMethod = getResolvedJavaMethod(testMethodName);
        ResolvedJavaMethod originalMethod = getResolvedJavaMethod(holder, methodName, parameterTypes);

        // Force compilation
        InstalledCode code = getCode(testMethod);
        assert code != null;

        // Verify that the original method and the substitution produce the same value
        Object expected = invokeSafe(originalMethod, receiver, args1);
        Object actual = invokeSafe(testMethod, null, args2);
        assertDeepEquals(expected, actual);

        // Verify that the generated code and the original produce the same value
        expected = invokeSafe(originalMethod, receiver, args1);
        actual = executeVarargsSafe(code, args2);
        assertDeepEquals(expected, actual);

    }

    @Test
    public void testUnsafeSubstitutions() throws Exception {
        testGraph("unsafeCopyMemory", HotSpotUnsafeSubstitutions.copyMemoryName);
    }

    public void unsafeCopyMemory(Object srcBase, long srcOffset, Object dstBase, long dstOffset, long bytes) {
        UNSAFE.copyMemory(srcBase, srcOffset, dstBase, dstOffset, bytes);
    }

    public byte[] testCopyMemorySnippet(long src, int bytes) {
        byte[] result = new byte[bytes];

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