1 /* 2 * Copyright (c) 2018, 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 package sun.hotspot.code; 25 26 import java.lang.reflect.Executable; 27 import sun.hotspot.WhiteBox; 28 29 /** 30 * API to obtain information about enabled JIT compilers 31 * retrieved from the VM with the WhiteBox API. 32 */ 33 public class Compiler { 34 35 private static final WhiteBox WB = WhiteBox.getWhiteBox(); 36 37 /** 38 * Check if Graal is used as JIT compiler. 39 * 40 * Graal is enabled if following conditions are true: 41 * - we are not in Interpreter mode 42 * - UseJVMCICompiler flag is true 43 * - jvmci.Compiler variable is equal to 'graal' 44 * - TieredCompilation is not used or TieredStopAtLevel is greater than 3 45 * No need to check client mode because it set UseJVMCICompiler to false. 46 * 47 * @return true if Graal is used as JIT compiler. 48 */ isGraalEnabled()49 public static boolean isGraalEnabled() { 50 Boolean useCompiler = WB.getBooleanVMFlag("UseCompiler"); 51 if (useCompiler == null || !useCompiler) { 52 return false; 53 } 54 Boolean useJvmciComp = WB.getBooleanVMFlag("UseJVMCICompiler"); 55 if (useJvmciComp == null || !useJvmciComp) { 56 return false; 57 } 58 // This check might be redundant but let's keep it for now. 59 String jvmciCompiler = System.getProperty("jvmci.Compiler"); 60 if (jvmciCompiler == null || !jvmciCompiler.equals("graal")) { 61 return false; 62 } 63 64 Boolean tieredCompilation = WB.getBooleanVMFlag("TieredCompilation"); 65 Long compLevel = WB.getIntxVMFlag("TieredStopAtLevel"); 66 // if TieredCompilation is enabled and compilation level is <= 3 then no Graal is used 67 if (tieredCompilation != null && tieredCompilation && 68 compLevel != null && compLevel <= 3) { 69 return false; 70 } 71 return true; 72 } 73 74 /** 75 * Check if C2 is used as JIT compiler. 76 * 77 * C2 is enabled if following conditions are true: 78 * - we are not in Interpreter mode 79 * - we are in Server compilation mode 80 * - TieredCompilation is not used or TieredStopAtLevel is greater than 3 81 * - Graal is not used 82 * 83 * @return true if C2 is used as JIT compiler. 84 */ isC2Enabled()85 public static boolean isC2Enabled() { 86 Boolean useCompiler = WB.getBooleanVMFlag("UseCompiler"); 87 if (useCompiler == null || !useCompiler) { 88 return false; 89 } 90 Boolean serverMode = WB.getBooleanVMFlag("ProfileInterpreter"); 91 if (serverMode == null || !serverMode) { 92 return false; 93 } 94 95 Boolean tieredCompilation = WB.getBooleanVMFlag("TieredCompilation"); 96 Long compLevel = WB.getIntxVMFlag("TieredStopAtLevel"); 97 // if TieredCompilation is enabled and compilation level is <= 3 then no Graal is used 98 if (tieredCompilation != null && tieredCompilation && 99 compLevel != null && compLevel <= 3) { 100 return false; 101 } 102 103 if (isGraalEnabled()) { 104 return false; 105 } 106 107 return true; 108 } 109 110 /* 111 * Check if C1 is used as JIT compiler. 112 * 113 * C1 is enabled if following conditions are true: 114 * - we are not in Interpreter mode 115 * - we are not in Server compilation mode 116 * - TieredCompilation is used in Server mode 117 * 118 * @return true if C1 is used as JIT compiler. 119 */ isC1Enabled()120 public static boolean isC1Enabled() { 121 Boolean useCompiler = WB.getBooleanVMFlag("UseCompiler"); 122 if (useCompiler == null || !useCompiler) { 123 return false; 124 } 125 Boolean serverMode = WB.getBooleanVMFlag("ProfileInterpreter"); 126 if (serverMode == null || !serverMode) { 127 return true; // Client mode 128 } 129 130 Boolean tieredCompilation = WB.getBooleanVMFlag("TieredCompilation"); 131 // C1 is not used in server mode if TieredCompilation is off. 132 if (tieredCompilation != null && !tieredCompilation) { 133 return false; 134 } 135 return true; 136 } 137 138 /* 139 * Determine if the compiler corresponding to the compilation level 'compLevel' 140 * provides an intrinsic for 'class'.'method'. 141 */ isIntrinsicAvailable(int compLevel, String klass, String method, Class<?>... parameterTypes)142 public static boolean isIntrinsicAvailable(int compLevel, String klass, String method, Class<?>... parameterTypes) { 143 Executable intrinsicMethod; 144 try { 145 intrinsicMethod = Class.forName(klass).getDeclaredMethod(method, parameterTypes); 146 } catch (NoSuchMethodException e) { 147 throw new RuntimeException("Test bug, '" + method + "' method unavailable. " + e); 148 } catch (ClassNotFoundException e) { 149 throw new RuntimeException("Test bug, '" + klass + "' class unavailable. " + e); 150 } 151 return WB.isIntrinsicAvailable(intrinsicMethod, compLevel); 152 } 153 } 154