rednaxelafx

# LMF class generated at runtime, dumped via
# <Scala 2.12.2>/bin/scala -cp . -Djdk.internal.lambda.dumpProxyClasses=dumpclasses Bar

$ javap -verbose -private -c -s -l 'Bar$$$Lambda$101.class'
Classfile /private/tmp/dumpclasses/Bar$$$Lambda$101.class
  Last modified Apr 30, 2020; size 695 bytes
  MD5 checksum 419f2634b1acdf7f40ba0bb7c22eabf4
final class Bar$$$Lambda$101 implements scala.runtime.java8.JFunction0$mcV$sp,scala.Serializable
  minor version: 0
  major version: 52

rednaxelafx

$ bin/spark-shell
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.apache.spark.unsafe.Platform (file:/home/krismok/code/work/oss-spark-readonly/assembly/target/scala-2.12/jars/spark-unsafe_2.12-3.0.0-SNAPSHOT.jar) to constructor java.nio.DirectByteBuffer(long,int)
WARNING: Please consider reporting this to the maintainers of org.apache.spark.unsafe.Platform
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
19/07/30 06:03:19 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties
Setting default log level to "WARN".
To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use setLogLevel(newLevel).

rednaxelafx

import java.util.Arrays;

public class TestSIMD {

  public static void doCompute(int[] a, int[] x, int[] y, int[] z) {
    for (int i = 0; i < a.length; i++) {
      a[i] = a[i] + x[i] * y[i] * z[i];
    }
  }

rednaxelafx

$ csc test.cs
Microsoft (R) Visual C# Compiler version 2.0.0.61404
Copyright (C) Microsoft Corporation. All rights reserved.

$ mono test.exe eager
MainThread
$ mono test.exe
NewTestThread
$ scalac test.scala 
$ java -cp $SCALA_HOME/lib/*:. TestLazy eager

rednaxelafx

$ sudo $JAVA_HOME/bin/java -cp $JAVA_HOME/lib/sa-jdi.jar sun.jvm.hotspot.CLHSDB
Password:
hsdb> attach 15168
Attaching to process 15168, please wait...
hsdb> class scala.Predef$
scala/Predef$ @0x00000007c003eb60 
hsdb> print 0x00000007c003eb60

public final class scala.Predef$ @0x00000007c003eb60

rednaxelafx

import java.util.*;

public class Fib {
  static int o = 0;

  public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    int n = in.nextInt();
    long start = System.currentTimeMillis();
    int answer = fib(n);

rednaxelafx

public class SynchSB {
  StringBuilder sb = new StringBuilder();

  public synchronized int length() {
    return sb.length();
  }

  public synchronized StringBuilder append(String str) {
    return sb.append(str);
  }

rednaxelafx

This patch fixes issues with building CRuby 2.3.3 with OPT_STACK_CACHING turned on.

Note that it doesn't fully work yet. This patch does allow the core VM to build, producing the miniruby binary. But as soon as it runs any substantial Ruby code, e.g. building the cgi library, it ends up crashing. The implementation in compile.c around iseq_set_sequence_stackcaching() / REPLACE_ELEM and friends is probably where the remaining bug is. It'd be nice to know what caused nobu-san to comment out REPLACE_ELEM in the first place.

$ make install
...

rednaxelafx

jit.dumping=true
jit.logging=true
jit.logging.verbose=true
jit.threshold=500

rednaxelafx

package pkga;

public class A {
  /* packcage access */ void fun() {
    System.out.println("A::fun()");
  }
}