JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2016, 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 jdk.tools.jaotc;

import jdk.tools.jaotc.binformat.BinaryContainer;
import jdk.tools.jaotc.binformat.Relocation.RelocType;
import org.graalvm.compiler.hotspot.HotSpotForeignCallLinkage;

import jdk.vm.ci.code.site.Call;

/**
 * This is a foreign call site. This means either a call to the VM or a call to a Graal stub. If
 * it's a call directly to the VM, mangle the name. The call should go through regular .plt used by
 * the system loader, at least for now. If it's a call to a Graal stub, it should always be a direct
 * call, since the Graal stubs are contained within the .so file.
 */
final class ForeignCallSiteRelocationInfo extends CallSiteRelocationInfo {

    ForeignCallSiteRelocationInfo(Call call, HotSpotForeignCallLinkage callTarget) {
        super(getTargetSymbol(call, callTarget), getRelocType(callTarget));
    }

    private static String getTargetSymbol(Call call, HotSpotForeignCallLinkage callTarget) {
        // If it specifies a foreign call linkage, find the symbol corresponding to the address in
        // HotSpotVMConfig's fields.
        final long foreignCallTargetAddress = callTarget.getAddress();

        // Get the C/C++ function name associated with the foreign call target address.
        String functionName = DataBuilder.getVMFunctionNameForAddress(foreignCallTargetAddress);
        if (functionName != null) {
            // Use the known global AOT symbol associated with function name, if one exists
            String aotSymbol = BinaryContainer.getAOTSymbolForVMFunctionName(functionName);
            if (aotSymbol == null) {
                throw new InternalError("no global symbol found for: " + functionName);
            }
            return aotSymbol;
        }

        // Is it a Graal stub we are calling?
        if (callTarget.isCompiledStub()) {
            assert call.direct : "Should always be a direct call to stubs";

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