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 sun.hotspot.WhiteBox; 27 28 /** 29 * API to obtain information about enabled JIT compilers 30 * retrieved from the VM with the WhiteBox API. 31 */ 32 public class Compiler { 33 34 private static final WhiteBox WB = WhiteBox.getWhiteBox(); 35 36 /** 37 * Check if Graal is used as JIT compiler. 38 * 39 * Graal is enabled if following conditions are true: 40 * - we are not in Interpreter mode 41 * - UseJVMCICompiler flag is true 42 * - jvmci.Compiler variable is equal to 'graal' 43 * - TieredCompilation is not used or TieredStopAtLevel is greater than 3 44 * No need to check client mode because it set UseJVMCICompiler to false. 45 * 46 * @return true if Graal is used as JIT compiler. 47 */ 48 public static boolean isGraalEnabled() { 49 Boolean useCompiler = WB.getBooleanVMFlag("UseCompiler"); 50 if (useCompiler == null || !useCompiler) { 51 return false; 52 } 53 Boolean useJvmciComp = WB.getBooleanVMFlag("UseJVMCICompiler"); 54 if (useJvmciComp == null || !useJvmciComp) { 55 return false; 56 } 57 // This check might be redundant but let's keep it for now. 58 String jvmciCompiler = System.getProperty("jvmci.Compiler"); 59 if (jvmciCompiler == null || !jvmciCompiler.equals("graal")) { 60 return false; 61 } 62 63 Boolean tieredCompilation = WB.getBooleanVMFlag("TieredCompilation"); 64 Long compLevel = WB.getIntxVMFlag("TieredStopAtLevel"); 65 // if TieredCompilation is enabled and compilation level is <= 3 then no Graal is used 66 if (tieredCompilation != null && tieredCompilation && 67 compLevel != null && compLevel <= 3) { 68 return false; 69 } 70 return true; 71 } 72 73 /** 74 * Check if C2 is used as JIT compiler. 75 * 76 * C2 is enabled if following conditions are true: 77 * - we are not in Interpreter mode 78 * - we are in Server compilation mode 79 * - TieredCompilation is not used or TieredStopAtLevel is greater than 3 80 * - Graal is not used 81 * 82 * @return true if C2 is used as JIT compiler. 83 */ 84 public static boolean isC2Enabled() { 85 Boolean useCompiler = WB.getBooleanVMFlag("UseCompiler"); 86 if (useCompiler == null || !useCompiler) { 87 return false; 88 } 89 Boolean serverMode = WB.getBooleanVMFlag("ProfileInterpreter"); 90 if (serverMode == null || !serverMode) { 91 return false; 92 } 93 94 Boolean tieredCompilation = WB.getBooleanVMFlag("TieredCompilation"); 95 Long compLevel = WB.getIntxVMFlag("TieredStopAtLevel"); 96 // if TieredCompilation is enabled and compilation level is <= 3 then no Graal is used 97 if (tieredCompilation != null && tieredCompilation && 98 compLevel != null && compLevel <= 3) { 99 return false; 100 } 101 102 if (isGraalEnabled()) { 103 return false; 104 } 105 106 return true; 107 } 108 109 /* 110 * Check if C1 is used as JIT compiler. 111 * 112 * C1 is enabled if following conditions are true: 113 * - we are not in Interpreter mode 114 * - we are not in Server compilation mode 115 * - TieredCompilation is used in Server mode 116 * 117 * @return true if C1 is used as JIT compiler. 118 */ 119 public static boolean isC1Enabled() { 120 Boolean useCompiler = WB.getBooleanVMFlag("UseCompiler"); 121 if (useCompiler == null || !useCompiler) { 122 return false; 123 } 124 Boolean serverMode = WB.getBooleanVMFlag("ProfileInterpreter"); 125 if (serverMode == null || !serverMode) { 126 return true; // Client mode 127 } 128 129 Boolean tieredCompilation = WB.getBooleanVMFlag("TieredCompilation"); 130 // C1 is not used in server mode if TieredCompilation is off. 131 if (tieredCompilation != null && !tieredCompilation) { 132 return false; 133 } 134 return true; 135 } 136 }