1 /* 2 * Copyright (c) 2016, 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 org.graalvm.compiler.hotspot; 24 25 import java.util.Formatter; 26 import java.util.Objects; 27 28 /** 29 * Mechanism for checking that the current Java runtime environment supports the minimum JVMCI API 30 * required by Graal. The {@code JVMCI_VERSION_CHECK} environment variable can be used to ignore a 31 * failed check ({@code JVMCI_VERSION_CHECK=ignore}) or print a warning ( 32 * {@code JVMCI_VERSION_CHECK=warn}) and continue. Otherwise, a failed check results in an 33 * {@link InternalError} being raised or, if called from {@link #main(String[])}, the VM exiting 34 * with a result code of {@code -1} 35 * 36 * This class only depends on the JDK so that it can be used without building Graal. 37 */ 38 class JVMCIVersionCheck { 39 40 private static final int JVMCI8_MIN_MAJOR_VERSION = 0; 41 private static final int JVMCI8_MIN_MINOR_VERSION = 29; 42 43 // MAX_VALUE indicates that no current EA version is compatible with Graal. 44 // Note: Keep README.md in sync with the EA version support checked here. 45 private static final int JVMCI9_MIN_EA_BUILD = 176; 46 47 private static void failVersionCheck(boolean exit, String reason, Object... args) { 48 Formatter errorMessage = new Formatter().format(reason, args); 49 String javaHome = System.getProperty("java.home"); 50 String vmName = System.getProperty("java.vm.name"); 51 errorMessage.format("Set the JVMCI_VERSION_CHECK environment variable to \"ignore\" to suppress "); 52 errorMessage.format("this error or to \"warn\" to emit a warning and continue execution.%n"); 53 errorMessage.format("Currently used Java home directory is %s.%n", javaHome); 54 errorMessage.format("Currently used VM configuration is: %s%n", vmName); 55 if (System.getProperty("java.specification.version").compareTo("1.9") < 0) { 56 errorMessage.format("Download the latest JVMCI JDK 8 from http://www.oracle.com/technetwork/oracle-labs/program-languages/downloads/index.html"); 57 } else { 58 errorMessage.format("Download the latest JDK 9 EA from https://jdk9.java.net/download/"); 59 } 60 String value = System.getenv("JVMCI_VERSION_CHECK"); 61 if ("warn".equals(value)) { 62 System.err.println(errorMessage.toString()); 63 } else if ("ignore".equals(value)) { 64 return; 65 } else if (exit) { 66 System.err.println(errorMessage.toString()); 67 System.exit(-1); 68 } else { 69 throw new InternalError(errorMessage.toString()); 70 } 71 } 72 73 static void check(boolean exitOnFailure) { 74 // Don't use regular expressions to minimize Graal startup time 75 String vmVersion = System.getProperty("java.vm.version"); 76 if (System.getProperty("java.specification.version").compareTo("1.9") < 0) { 77 int start = vmVersion.indexOf("-jvmci-"); 78 if (start >= 0) { 79 start += "-jvmci-".length(); 80 int end = vmVersion.indexOf('.', start); 81 if (end > 0) { 82 int major; 83 try { 84 major = Integer.parseInt(vmVersion.substring(start, end)); 85 } catch (NumberFormatException e) { 86 failVersionCheck(exitOnFailure, "The VM does not support the minimum JVMCI API version required by Graal.%n" + 87 "Cannot read JVMCI major version from java.vm.version property: %s.%n", vmVersion); 88 return; 89 } 90 start = end + 1; 91 end = start; 92 while (end < vmVersion.length() && Character.isDigit(vmVersion.charAt(end))) { 93 end++; 94 } 95 int minor; 96 try { 97 minor = Integer.parseInt(vmVersion.substring(start, end)); 98 } catch (NumberFormatException e) { 99 failVersionCheck(exitOnFailure, "The VM does not support the minimum JVMCI API version required by Graal.%n" + 100 "Cannot read JVMCI minor version from java.vm.version property: %s.%n", vmVersion); 101 return; 102 } 103 if (major >= JVMCI8_MIN_MAJOR_VERSION && minor >= JVMCI8_MIN_MINOR_VERSION) { 104 return; 105 } 106 failVersionCheck(exitOnFailure, "The VM does not support the minimum JVMCI API version required by Graal: %d.%d < %d.%d.%n", 107 major, minor, JVMCI8_MIN_MAJOR_VERSION, JVMCI8_MIN_MINOR_VERSION); 108 return; 109 } 110 } 111 failVersionCheck(exitOnFailure, "The VM does not support the minimum JVMCI API version required by Graal.%n" + 112 "Cannot read JVMCI version from java.vm.version property: %s.%n", vmVersion); 113 } else { 114 if (vmVersion.contains("SNAPSHOT")) { 115 // The snapshot of http://hg.openjdk.java.net/jdk9/dev tip is expected to work 116 return; 117 } 118 if (vmVersion.contains("internal")) { 119 // Allow local builds 120 return; 121 } 122 // http://openjdk.java.net/jeps/223 123 if (vmVersion.startsWith("9+")) { 124 int start = "9+".length(); 125 int end = start; 126 end = start; 127 while (end < vmVersion.length() && Character.isDigit(vmVersion.charAt(end))) { 128 end++; 129 } 130 int build; 131 try { 132 build = Integer.parseInt(vmVersion.substring(start, end)); 133 } catch (NumberFormatException e) { 134 failVersionCheck(exitOnFailure, "The VM does not support the minimum JVMCI API version required by Graal.%n" + 135 "Cannot read JDK9 EA build number from java.vm.version property: %s.%n", vmVersion); 136 return; 137 } 138 if (build >= JVMCI9_MIN_EA_BUILD) { 139 return; 140 } 141 if (Objects.equals(JVMCI9_MIN_EA_BUILD, Integer.MAX_VALUE)) { 142 failVersionCheck(exitOnFailure, "This version of Graal is not compatible with any JDK 9 Early Access build.%n"); 143 } else { 144 failVersionCheck(exitOnFailure, "The VM is an insufficiently recent EA JDK9 build for Graal: %d < %d.%n", build, JVMCI9_MIN_EA_BUILD); 145 } 146 return; 147 } else { 148 // Graal will be compatible with all JDK versions as of 9 GA 149 // until a JVMCI API change is made in a 9u or later release. 150 } 151 } 152 } 153 154 /** 155 * Command line interface for performing the check. 156 */ 157 public static void main(String[] args) { 158 check(true); 159 } 160 }