1 /* 2 * Copyright (c) 2014, 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.*; 26 import static jdk.vm.ci.hotspot.UnsafeAccess.UNSAFE; 27 28 import sun.misc.*; 29 30 /** 31 * Class to access the C++ {@code vmSymbols} table. 32 */ 33 public final class HotSpotVmSymbols { 34 35 /** 36 * Returns the symbol in the {@code vmSymbols} table at position {@code index} as {@link String} 37 * . 38 * 39 * @param index position in the symbol table 40 * @return the symbol at position id 41 */ 42 public static String symbolAt(int index) { 43 HotSpotJVMCIRuntimeProvider runtime = runtime(); 44 HotSpotVMConfig config = runtime.getConfig(); 45 assert config.vmSymbolsFirstSID <= index && index < config.vmSymbolsSIDLimit : "index " + index + " is out of bounds"; 46 assert config.symbolPointerSize == Unsafe.ADDRESS_SIZE : "the following address read is broken"; 47 return runtime.getCompilerToVM().getSymbol(UNSAFE.getAddress(config.vmSymbolsSymbols + index * config.symbolPointerSize)); 48 } 49 }