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