1/*
2 * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24package jdk.tools.jaotc;
25
26import jdk.tools.jaotc.binformat.BinaryContainer;
27import jdk.tools.jaotc.binformat.Relocation.RelocType;
28import org.graalvm.compiler.hotspot.HotSpotForeignCallLinkage;
29
30import jdk.vm.ci.code.site.Call;
31
32/**
33 * This is a foreign call site. This means either a call to the VM or a call to a Graal stub. If
34 * it's a call directly to the VM, mangle the name. The call should go through regular .plt used by
35 * the system loader, at least for now. If it's a call to a Graal stub, it should always be a direct
36 * call, since the Graal stubs are contained within the .so file.
37 */
38final class ForeignCallSiteRelocationInfo extends CallSiteRelocationInfo {
39
40    ForeignCallSiteRelocationInfo(Call call, HotSpotForeignCallLinkage callTarget) {
41        super(getTargetSymbol(call, callTarget), getRelocType(callTarget));
42    }
43
44    private static String getTargetSymbol(Call call, HotSpotForeignCallLinkage callTarget) {
45        // If it specifies a foreign call linkage, find the symbol corresponding to the address in
46        // HotSpotVMConfig's fields.
47        final long foreignCallTargetAddress = callTarget.getAddress();
48
49        // Get the C/C++ function name associated with the foreign call target address.
50        String functionName = DataBuilder.getVMFunctionNameForAddress(foreignCallTargetAddress);
51        if (functionName != null) {
52            // Use the known global AOT symbol associated with function name, if one exists
53            String aotSymbol = BinaryContainer.getAOTSymbolForVMFunctionName(functionName);
54            if (aotSymbol == null) {
55                throw new InternalError("no global symbol found for: " + functionName);
56            }
57            return aotSymbol;
58        }
59
60        // Is it a Graal stub we are calling?
61        if (callTarget.isCompiledStub()) {
62            assert call.direct : "Should always be a direct call to stubs";
63            return callTarget.getSymbol();
64        }
65
66        throw new InternalError("no symbol found for: " + callTarget);
67    }
68
69    private static RelocType getRelocType(HotSpotForeignCallLinkage callTarget) {
70        return callTarget.isCompiledStub() ? RelocType.STUB_CALL_DIRECT : RelocType.FOREIGN_CALL_INDIRECT_GOT;
71    }
72
73}
74