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 
  24 
  25 
  26 package jdk.tools.jaotc;
  27 
  28 import jdk.tools.jaotc.binformat.BinaryContainer;
  29 import jdk.tools.jaotc.binformat.Relocation.RelocType;
  30 import org.graalvm.compiler.hotspot.HotSpotForeignCallLinkage;
  31 
  32 import jdk.vm.ci.code.site.Call;
  33 
  34 /**
  35  * This is a foreign call site. This means either a call to the VM or a call to a Graal stub. If
  36  * it's a call directly to the VM, mangle the name. The call should go through regular .plt used by
  37  * the system loader, at least for now. If it's a call to a Graal stub, it should always be a direct
  38  * call, since the Graal stubs are contained within the .so file.
  39  */
  40 final class ForeignCallSiteRelocationInfo extends CallSiteRelocationInfo {
  41 
  42     ForeignCallSiteRelocationInfo(Call call, HotSpotForeignCallLinkage callTarget) {
  43         super(getTargetSymbol(call, callTarget), getRelocType(callTarget));
  44     }
  45 
  46     private static String getTargetSymbol(Call call, HotSpotForeignCallLinkage callTarget) {
  47         // If it specifies a foreign call linkage, find the symbol corresponding to the address in
  48         // HotSpotVMConfig's fields.
  49         final long foreignCallTargetAddress = callTarget.getAddress();
  50 
  51         // Get the C/C++ function name associated with the foreign call target address.
  52         String functionName = DataBuilder.getVMFunctionNameForAddress(foreignCallTargetAddress);
  53         if (functionName != null) {
  54             // Use the known global AOT symbol associated with function name, if one exists
  55             String aotSymbol = BinaryContainer.getAOTSymbolForVMFunctionName(functionName);
  56             if (aotSymbol == null) {
  57                 throw new InternalError("no global symbol found for: " + functionName);
  58             }
  59             return aotSymbol;
  60         }
  61 
  62         // Is it a Graal stub we are calling?
  63         if (callTarget.isCompiledStub()) {
  64             assert call.direct : "Should always be a direct call to stubs";
  65             return callTarget.getSymbol();
  66         }
  67 
  68         throw new InternalError("no symbol found for: " + callTarget);
  69     }
  70 
  71     private static RelocType getRelocType(HotSpotForeignCallLinkage callTarget) {
  72         return callTarget.isCompiledStub() ? RelocType.STUB_CALL_DIRECT : RelocType.FOREIGN_CALL_INDIRECT_GOT;
  73     }
  74 
  75 }