Implement for..in for FastDoubleArrays

test/mjsunit/unbox-double-arrays.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 399 matching lines @@
 assertTrue(%HasFastDoubleElements(large_array3));
 assertEquals(undefined, large_array3[100]);
 assertEquals(95, large_array3[95]);
 assertEquals(expected_array_value(5), large_array3[5]);
 assertEquals(expected_array_value(6), large_array3[6]);
 assertEquals(expected_array_value(7), large_array3[7]);
 assertEquals(undefined, large_array3[large_array3.length-1]);
 assertEquals(undefined, large_array3[large_array_size-1]);
 assertEquals(undefined, large_array3[-1]);
 gc();
+
+// Test apply on arrays backed by double elements.
+function called_by_apply(arg0, arg1, arg2, arg3, arg4, arg5, arg6) {
+  assertEquals(expected_array_value(0), arg0);
+  assertEquals(NaN, arg1);
+  assertEquals(-NaN, arg2);
+  assertEquals(Infinity, arg3);
+  assertEquals(-Infinity, arg4);
+  assertEquals(expected_array_value(5), arg5);
+}
+
+large_array3[1] = NaN;
+large_array3[2] = -NaN;
+large_array3[3] = Infinity;
+large_array3[4] = -Infinity;
+
+function call_apply() {
+  assertTrue(%HasFastDoubleElements(large_array3));
+  called_by_apply.apply({}, large_array3);
+}
+
+call_apply();
+call_apply();
+call_apply();
+%OptimizeFunctionOnNextCall(call_apply);
+call_apply();
+call_apply();
+call_apply();
+
+function test_for_in() {
+  // Due to previous tests, keys 0..25 and 95 should be present.
+  next_expected = 0;
+  assertTrue(%HasFastDoubleElements(large_array3));
+  for (x in large_array3) {
+    assertTrue(next_expected++ == x);
+    if (next_expected == 25) {
+      next_expected = 95;
+    }
+  }
+  assertTrue(next_expected == 96);
+}
+
+test_for_in();
+test_for_in();
+test_for_in();
+%OptimizeFunctionOnNextCall(test_for_in);
+test_for_in();
+test_for_in();
+test_for_in();