Implement tracking and optimizations of packed arrays

test/mjsunit/elements-kind-depends.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 28 matching lines @@
   assertEquals(10, a[0]);
   assertEquals(15.5, a[1]);
   assertEquals(20, a[2]);
 }
 
 var b;
 for (var i = 0; i < 3; ++i) {
   b = burn();
   check(b);  // all OK
 }
-%OptimizeFunctionOnNextCall(burn);
+//%OptimizeFunctionOnNextCall(burn);

[Jakob Kummerow, 2012/05/13 21:55:27]

This doesn't look intentional.

[danno, 2012/05/22 11:05:21]

Done.

 b = burn();
 check(b);  // fails
 
 
 function loop_test(x) {
   for (i=0;i<3;i++) {
     x[i] = (i+1) * 0.5;
   }
 }
 
 function check2(b) {
   assertEquals(0.5, b[0]);
   assertEquals(1.0, b[1]);
   assertEquals(1.5, b[2]);
 }
 
 for (var i = 0; i < 3; ++i) {
   b = [0,1,2];
   loop_test(b);
   check2(b);
 }
 %OptimizeFunctionOnNextCall(loop_test);
 b = [0,1,2];
 loop_test(b);
 check2(b);