src/jdk.aot/share/classes/jdk.tools.jaotc/src/jdk/tools/jaotc/ForeignCallSiteRelocationInfo.java
author alanb
Sat, 13 Apr 2019 07:22:55 +0100
branchniosocketimpl-branch
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parent 52910 583fd71c47d6
permissions -rw-r--r--
stateLock and closeLock need to be ReentrantLock
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/*
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 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package jdk.tools.jaotc;
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import jdk.tools.jaotc.binformat.BinaryContainer;
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import jdk.tools.jaotc.binformat.Relocation.RelocType;
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import org.graalvm.compiler.hotspot.HotSpotForeignCallLinkage;
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import jdk.vm.ci.code.site.Call;
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/**
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 * This is a foreign call site. This means either a call to the VM or a call to a Graal stub. If
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 * it's a call directly to the VM, mangle the name. The call should go through regular .plt used by
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 * the system loader, at least for now. If it's a call to a Graal stub, it should always be a direct
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 * call, since the Graal stubs are contained within the .so file.
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 */
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final class ForeignCallSiteRelocationInfo extends CallSiteRelocationInfo {
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    ForeignCallSiteRelocationInfo(Call call, HotSpotForeignCallLinkage callTarget) {
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        super(getTargetSymbol(call, callTarget), getRelocType(callTarget));
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    }
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    private static String getTargetSymbol(Call call, HotSpotForeignCallLinkage callTarget) {
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        // If it specifies a foreign call linkage, find the symbol corresponding to the address in
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        // HotSpotVMConfig's fields.
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        final long foreignCallTargetAddress = callTarget.getAddress();
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        // Get the C/C++ function name associated with the foreign call target address.
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        String functionName = DataBuilder.getVMFunctionNameForAddress(foreignCallTargetAddress);
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        if (functionName != null) {
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            // Use the known global AOT symbol associated with function name, if one exists
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            String aotSymbol = BinaryContainer.getAOTSymbolForVMFunctionName(functionName);
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            if (aotSymbol == null) {
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                throw new InternalError("no global symbol found for: " + functionName);
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            }
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            return aotSymbol;
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        }
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        // Is it a Graal stub we are calling?
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        if (callTarget.isCompiledStub()) {
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            assert call.direct : "Should always be a direct call to stubs";
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            return callTarget.getSymbol();
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        }
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        throw new InternalError("no symbol found for: " + callTarget);
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    }
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    private static RelocType getRelocType(HotSpotForeignCallLinkage callTarget) {
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        return callTarget.isCompiledStub() ? RelocType.STUB_CALL_DIRECT : RelocType.FOREIGN_CALL_INDIRECT_GOT;
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    }
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}