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package org.graalvm.compiler.hotspot;

import java.util.Formatter;

Mechanism for checking that the current Java runtime environment supports the minimum JVMCI API required by Graal. The JVMCI_VERSION_CHECK environment variable can be used to ignore a failed check (JVMCI_VERSION_CHECK=ignore) or print a warning ( JVMCI_VERSION_CHECK=warn) and continue. Otherwise, a failed check results in an InternalError being raised or, if called from main(String[]), the VM exiting with a result code of -1 This class only depends on the JDK so that it can be used without building Graal.
/** * Mechanism for checking that the current Java runtime environment supports the minimum JVMCI API * required by Graal. The {@code JVMCI_VERSION_CHECK} environment variable can be used to ignore a * failed check ({@code JVMCI_VERSION_CHECK=ignore}) or print a warning ( * {@code JVMCI_VERSION_CHECK=warn}) and continue. Otherwise, a failed check results in an * {@link InternalError} being raised or, if called from {@link #main(String[])}, the VM exiting * with a result code of {@code -1} * * This class only depends on the JDK so that it can be used without building Graal. */
class JVMCIVersionCheck { private static final int JVMCI8_MIN_MAJOR_VERSION = 0; private static final int JVMCI8_MIN_MINOR_VERSION = 46; private static void failVersionCheck(boolean exit, String reason, Object... args) { Formatter errorMessage = new Formatter().format(reason, args); String javaHome = System.getProperty("java.home"); String vmName = System.getProperty("java.vm.name"); errorMessage.format("Set the JVMCI_VERSION_CHECK environment variable to \"ignore\" to suppress "); errorMessage.format("this error or to \"warn\" to emit a warning and continue execution.%n"); errorMessage.format("Currently used Java home directory is %s.%n", javaHome); errorMessage.format("Currently used VM configuration is: %s%n", vmName); if (System.getProperty("java.specification.version").compareTo("1.9") < 0) { errorMessage.format("Download the latest JVMCI JDK 8 from http://www.oracle.com/technetwork/oracle-labs/program-languages/downloads/index.html"); } else { errorMessage.format("Download JDK 11 or later."); } String value = System.getenv("JVMCI_VERSION_CHECK"); if ("warn".equals(value)) { System.err.println(errorMessage.toString()); } else if ("ignore".equals(value)) { return; } else if (exit) { System.err.println(errorMessage.toString()); System.exit(-1); } else { throw new InternalError(errorMessage.toString()); } } static void check(boolean exitOnFailure) { // Don't use regular expressions to minimize Graal startup time String javaSpecVersion = System.getProperty("java.specification.version"); String vmVersion = System.getProperty("java.vm.version"); if (javaSpecVersion.compareTo("1.9") < 0) { int start = vmVersion.indexOf("-jvmci-"); if (start >= 0) { start += "-jvmci-".length(); int end = vmVersion.indexOf('.', start); if (end > 0) { int major; try { major = Integer.parseInt(vmVersion.substring(start, end)); } catch (NumberFormatException e) { failVersionCheck(exitOnFailure, "The VM does not support the minimum JVMCI API version required by Graal.%n" + "Cannot read JVMCI major version from java.vm.version property: %s.%n", vmVersion); return; } start = end + 1; end = start; while (end < vmVersion.length() && Character.isDigit(vmVersion.charAt(end))) { end++; } int minor; try { minor = Integer.parseInt(vmVersion.substring(start, end)); } catch (NumberFormatException e) { failVersionCheck(exitOnFailure, "The VM does not support the minimum JVMCI API version required by Graal.%n" + "Cannot read JVMCI minor version from java.vm.version property: %s.%n", vmVersion); return; } if (major >= JVMCI8_MIN_MAJOR_VERSION && minor >= JVMCI8_MIN_MINOR_VERSION) { return; } failVersionCheck(exitOnFailure, "The VM does not support the minimum JVMCI API version required by Graal: %d.%d < %d.%d.%n", major, minor, JVMCI8_MIN_MAJOR_VERSION, JVMCI8_MIN_MINOR_VERSION); return; } } failVersionCheck(exitOnFailure, "The VM does not support the minimum JVMCI API version required by Graal.%n" + "Cannot read JVMCI version from java.vm.version property: %s.%n", vmVersion); } else if (javaSpecVersion.compareTo("11") < 0) { failVersionCheck(exitOnFailure, "Graal is not compatible with the JVMCI API in JDK 9 and 10.%n"); } else { if (vmVersion.contains("SNAPSHOT")) { return; } if (vmVersion.contains("internal")) { // Allow local builds return; } if (vmVersion.startsWith("11-ea+")) { String buildString = vmVersion.substring("11-ea+".length()); try { int build = Integer.parseInt(buildString); if (build < 20) { failVersionCheck(exitOnFailure, "Graal requires build 20 or later of JDK 11 early access binary, got build %d.%n", build); return; } } catch (NumberFormatException e) { failVersionCheck(exitOnFailure, "Could not parse the JDK 11 early access build number from java.vm.version property: %s.%n", vmVersion); return; } } else { // Graal is compatible with all JDK versions as of 11 GA. } } }
Command line interface for performing the check.
/** * Command line interface for performing the check. */
public static void main(String[] args) { check(true); } }