1 /* 2 * Copyright (c) 2014, 2015, 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 package jdk.vm.ci.hotspot; 24 25 import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.runtime; 26 import static jdk.vm.ci.hotspot.UnsafeAccess.UNSAFE; 27 import sun.misc.Unsafe; 28 29 /** 30 * Class to access the C++ {@code vmSymbols} table. 31 */ 32 final class HotSpotVmSymbols { 33 34 /** 35 * Returns the symbol in the {@code vmSymbols} table at position {@code index} as {@link String} 36 * . 37 * 38 * @param index position in the symbol table 39 * @return the symbol at position id 40 */ 41 static String symbolAt(int index) { 42 HotSpotJVMCIRuntimeProvider runtime = runtime(); 43 HotSpotVMConfig config = runtime.getConfig(); 44 assert config.vmSymbolsFirstSID <= index && index < config.vmSymbolsSIDLimit : "index " + index + " is out of bounds"; 45 assert config.symbolPointerSize == Unsafe.ADDRESS_SIZE : "the following address read is broken"; 46 return runtime.getCompilerToVM().getSymbol(UNSAFE.getAddress(config.vmSymbolsSymbols + index * config.symbolPointerSize)); 47 } 48 }