Kris Mok rednaxelafx
rednaxelafx
/ .hotspot_compiler
Last active
April 8, 2018 01:21
Demo of making an intrinsic method that takes pointer argument and returns an oop. This version doesn't work, though. Diff against hotspot-comp, changeset 446cb5d25d03. Discussion: http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2013-August/011252.html
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| exclude Main main | |
| dontinline Main doTest | |
| compileonly Main doTest | |
| compileonly FxIntrinsics * |
rednaxelafx
/ Test.java
Created
August 1, 2013 06:44
Dynamic proxy in Java loses generic type information. Demo with CLHSDB, run on JDK8b99/Mac OS X 10.7.5. This gist is to answer question from https://gist.github.com/kdlan/6128766
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| import java.lang.reflect.InvocationHandler; | |
| import java.lang.reflect.Method; | |
| import java.lang.reflect.Proxy; | |
| import java.lang.reflect.Type; | |
| import java.util.Arrays; | |
| import java.util.List; | |
| import java.util.Map; | |
| public class Test { | |
| public interface TestService{ |
rednaxelafx
/ sajs.patch
Created
July 29, 2013 07:19
Various fixes to sa.js to make it work with Nashorn in JDK8
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| diff -r d90d1b96b65b agent/src/share/classes/sun/jvm/hotspot/utilities/soql/sa.js | |
| --- a/agent/src/share/classes/sun/jvm/hotspot/utilities/soql/sa.js Fri Jul 26 12:37:39 2013 -0700 | |
| +++ b/agent/src/share/classes/sun/jvm/hotspot/utilities/soql/sa.js Mon Jul 29 15:18:50 2013 +0800 | |
| @@ -35,8 +35,9 @@ | |
| sapkg.code = sapkg.hotspot.code; | |
| sapkg.compiler = sapkg.hotspot.compiler; | |
| -// 'debugger' is a JavaScript keyword :-( | |
| -// sapkg.debugger = sapkg.hotspot.debugger; | |
| +// 'debugger' is a JavaScript keyword, but ES5 relaxes the |
rednaxelafx
/ chakra.reg
Created
May 15, 2013 04:13
Running a simple microbenchmark on both 32-bit and 64-bit versions of JScript 5.8 and 9.0, on 64-bit Windodws 7
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| Windows Registry Editor Version 5.00 | |
| [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{16d51579-a30b-4c8b-a276-0ff4dc41e755}\ProgID] | |
| @="Chakra" | |
| [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{16d51579-a30b-4c8b-a276-0ff4dc41e755}\ProgID] | |
| @="Chakra" | |
| [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Chakra] | |
| @="JScript Language" |
rednaxelafx
/ command_prompt_win7_x64
Created
May 14, 2013 15:48
Ruby script to determine the architecture of a PE file. A port of the Perl version from http://stackoverflow.com/questions/495244/how-can-i-test-a-windows-dll-to-determine-if-it-is-32bit-or-64bit, courtesey of Paul Dixon
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| D:\temp>ruby petype.rb petype.rb | |
| Not an executable | |
| D:\temp>ruby petype.rb C:\Windows\system32\notepad.exe | |
| amd64 | |
| D:\temp>ruby petype.rb C:\Windows\system32\jscript9.dll | |
| amd64 | |
| D:\temp>ruby petype.rb C:\Windows\syswow64\jscript9.dll |
rednaxelafx
/ Main.java
Last active
November 26, 2021 14:23
Code and session notes for blog post: Exploring HotSpot runtime data with HSDB http://rednaxelafx.iteye.com/blog/1847971
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| public class Main { | |
| public static void main(String[] args) { | |
| Test test = new Test(); | |
| test.fn(); | |
| } | |
| } |
rednaxelafx
/ MysteryBox.java
Created
February 20, 2013 04:20
SA demo from https://gist.github.com/rednaxelafx/4986917 without UseCompressedOops
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| public class MysteryBox { | |
| private long x0, x1; | |
| private boolean y0, y1, y2, y3; | |
| private int z0; | |
| private double[] a = new double[8]; | |
| } |
rednaxelafx
/ MysteryBox.java
Last active
July 10, 2022 06:25
Very simple demo of using CLHSDB from HotSpot Serviceability Agent to inspect Java objects and class metadata
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| public class MysteryBox { | |
| private long x0, x1; | |
| private boolean y0, y1, y2, y3; | |
| private int z0; | |
| private double[] a = new double[8]; | |
| } |
rednaxelafx
/ Hello.java
Created
November 26, 2012 15:24
Should restore FPU state on interpreter re-entry. This test case is from Xi Yang; it affects x86 HotSpot only, x64 is not affected.
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| public class Hello { | |
| private static native void abc(); | |
| public static void main(String[] args) { | |
| System.out.println("I am main"); | |
| System.loadLibrary("hello"); | |
| abc(); | |
| long a = 100; | |
| double b = (double)a; | |
| System.out.println("Double a is " + b); | |
| } |
rednaxelafx
/ command_prompt
Created
November 26, 2012 13:51
bash: ./java: No such file or directory. Caused by missing 32-bit libs on a 64-bit system. Installing ia32-libs fixes the problem. Install libc6-dev-i386 to fix gcc missing header; lib32stdc++6, g++-4.6-multilib. See also http://t.cn/zjGxUcX
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| kmo@ubuntu:~/sdk/jdk1.7.0_09_32/bin | |
| $ ./java | |
| bash: ./java: No such file or directory | |
| kmo@ubuntu:~/sdk/jdk1.7.0_09_32/bin | |
| $ file ./java | |
| ./java: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.9, BuildID[sha1]=0xb4f81805640a786538c721d745f97f3485d03e3c, not stripped | |
| kmo@ubuntu:~/sdk/jdk1.7.0_09_32/bin | |
| $ ldd ./java | |
| not a dynamic executable | |
| kmo@ubuntu:~/sdk/jdk1.7.0_09_32/bin |