Created
November 9, 2019 21:26
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Convert output of -XX:PrintTouchedMethodsAtExit into form usable by JEP 295 AOT
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| import java.io.IOException; | |
| import java.nio.file.Files; | |
| import java.nio.file.Path; | |
| import java.nio.file.Paths; | |
| import java.nio.file.StandardOpenOption; | |
| import java.util.stream.Stream; | |
| /** | |
| * Converts from TouchedMethods format to AOT format | |
| * | |
| * 1. Run your code: | |
| * java -XX:+UnlockDiagnosticVMOptions -XX:+LogTouchedMethods -XX:+PrintTouchedMethodsAtExit \ | |
| * -jar <jar> > touched-methods.txt | |
| * | |
| * 2. Convert to AOT compile-command form: | |
| * java Converter.java touched-methods.txt | |
| * | |
| * 3. Make the AOT shared library, with the modules we desire | |
| * jaotc --compile-for-tiered -J-Xmx4g --compile-commands aot-commands.txt \ | |
| * --output libidea.so --module java.base:java.desktop --info | |
| * | |
| * 4. Run with shared archive | |
| * java -XX:+UseAOT -XX:AOTLibrary=<lib.so> -jar <jar> | |
| */ | |
| public class Converter { | |
| // Recommended in https://openjdk.java.net/jeps/295 | |
| private static final String JAVA_BASE_COMPILE_COMMANDS = "# jaotc: java.lang.StackOverflowError\n" + | |
| "exclude sun.util.resources.LocaleNames.getContents()[[Ljava/lang/Object;\n" + | |
| "exclude sun.util.resources.TimeZoneNames.getContents()[[Ljava/lang/Object;\n" + | |
| "exclude sun.util.resources.cldr.LocaleNames.getContents()[[Ljava/lang/Object;\n" + | |
| "exclude sun.util.resources..*.LocaleNames_.*.getContents\\(\\)\\[\\[Ljava/lang/Object;\n" + | |
| "exclude sun.util.resources..*.LocaleNames_.*_.*.getContents\\(\\)\\[\\[Ljava/lang/Object;\n" + | |
| "exclude sun.util.resources..*.TimeZoneNames_.*.getContents\\(\\)\\[\\[Ljava/lang/Object;\n" + | |
| "exclude sun.util.resources..*.TimeZoneNames_.*_.*.getContents\\(\\)\\[\\[Ljava/lang/Object;\n" + | |
| "# java.lang.Error: Trampoline must not be defined by the bootstrap classloader\n" + | |
| "exclude sun.reflect.misc.Trampoline.<clinit>()V\n" + | |
| "exclude sun.reflect.misc.Trampoline.invoke(Ljava/lang/reflect/Method;Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;\n" + | |
| "# JVM asserts\n" + | |
| "exclude com.sun.crypto.provider.AESWrapCipher.engineUnwrap([BLjava/lang/String;I)Ljava/security/Key;\n" + | |
| "exclude sun.security.ssl.*\n" + | |
| "exclude sun.net.RegisteredDomain.<clinit>()V\n" + | |
| "# Huge methods\n" + | |
| "exclude jdk.internal.module.SystemModules.descriptors()[Ljava/lang/module/ModuleDescriptor;\n"; | |
| public static void main(String[] args) throws IOException { | |
| Path touchedMethods = Paths.get(args[0]); | |
| Path compileCommands = touchedMethods.resolveSibling("aot-commands.txt"); | |
| Stream<String> converted = Files.lines(touchedMethods) | |
| .filter(l -> l.startsWith("java") || l.startsWith("javax/swing") || l.startsWith("jdk")) | |
| .map(Converter::toAOTForm); | |
| Files.write(compileCommands, (Iterable<String>) converted::iterator); | |
| Files.writeString(compileCommands, JAVA_BASE_COMPILE_COMMANDS, StandardOpenOption.APPEND); | |
| System.out.println("Done writing to " + compileCommands.getFileName()); | |
| } | |
| private static String toAOTForm(String s) { | |
| int paramIdx = s.indexOf(':'); | |
| return "compileOnly " + | |
| s.substring(0, paramIdx).replace('/', '.') + | |
| s.substring(paramIdx + 1); | |
| } | |
| } |
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