Experiments with JSR 292 and Rhino Wiki

Contents

• patches to Rhino
• sketches of code for doing instrumentation
• a stable copy of Rhino (not a modified fork)

Fetching and Building

We use Mercurial to manage code, same as for the Da Vinci Machine Project. You may need to install it first. The with the patch queue extension must be turned on.

Experiment Notes

• Classy Sketch
• Array Fast Paths
• Fixed-Point Numerics
• Calling Sequences

 $ cd my-workspace-folder
 $ hg clone https://hg.kenai.com/hg/davincimonkey~rhino dm-rhino
 $ cd dm-rhino
 $ hg clone https://hg.kenai.com/hg/davincimonkey~patches ./.hg/patches
 $ hg qpush --all  # apply all the patches

Working with files:

 $ hg loc ScriptRuntime.java  # display pathname of some file
 $ hg qnew mynewexperiment.patch  # start a new patch
 $ vi $(hg loc ScriptRuntime.java)
 $ hg qrefresh  # push changes into your patch

Remarks

Maybe we can eventually use a real MOP for this.

Thanks are due to Google's Chuck Rasbold who discovered the following curious identity:

 MethodHandle f = collectArguments(Arrays#asList, genericMethodType(13));
 MethodHandle g = permuteArguments(f, new int[]{6,9,2,0,1,12,11,10,3,8,4,5,7});
 Object a='a',c='c',d='d',e='e',i='i',k='k',m='m',n='n',o='o',v='v',y='y';
 Object fval = f.invokeExact(d,a,v,i,n,c,i,m,o,n,k,e,y);
 Object gval = g.invokeExact(i,n,v,o,k,e,d,y,n,a,m,i,c);
 //                          0 1 2 3 4 5 6 7 8 9 A B C
 assert fval.equals(gval);