[destructuring] Implement spread binding patterns.

src/runtime.js

Index: src/runtime.js
diff --git a/src/runtime.js b/src/runtime.js
index ab79a4bbde0853ee3f39b68c2cf8518fb8f8f975..fa6689df0cedc244cc666cea43135bc4eeb56d04 100644
--- a/src/runtime.js
+++ b/src/runtime.js
@@ -730,7 +730,6 @@ STACK_OVERFLOW = function STACK_OVERFLOW(length) {
   throw %MakeRangeError(kStackOverflow);
 }
 

[arv (Not doing code reviews), 2015/05/20 13:34:14]

undo this line removal... (it was probably from when you moved my function)

[Dmitry Lomov (no reviews), 2015/05/20 14:22:03]

Done.

-
 // Convert the receiver to an object - forward to ToObject.
 TO_OBJECT = function TO_OBJECT() {
   return %$toObject(this);
@@ -930,6 +929,14 @@ function SameValueZero(x, y) {
   return x === y;
 }
 
+function SpreadIntoArray(target, iterable) {

[rossberg, 2015/05/20 12:57:35]

Nit: ConcatIterableToArray

[arv (Not doing code reviews), 2015/05/20 13:34:14]

It is not to array... it adds it to an existing array. This is from my array
spread CL where we need to add the elements to an existing array.

For the rest destructuring we could skip passing an array and return a new
array. The only question is if we want to reuse this code or not?

[arv (Not doing code reviews), 2015/05/20 13:39:45]

There is also $spreadIterable which almost does this

https://code.google.com/p/chromium/codesearch#chromium/src/v8/src/harmony-spr...

(it returns an InternalArray)

[rossberg, 2015/05/20 13:49:39]

Hence Concat...ToArray ;)
It's good, as long as there is a simple way to make the array strong in strong
mode.

[Dmitry Lomov (no reviews), 2015/05/20 14:22:03]

Done.

+   var index = target.length;
+   for (var element of iterable) {
+     %AddElement(target, index++, element, NONE);
+   }
+   return target;
+}
+
 
 /* ---------------------------------
    - - -   U t i l i t i e s   - - -
@@ -1015,6 +1022,7 @@ $nonNumberToNumber = NonNumberToNumber;
 $nonStringToString = NonStringToString;
 $sameValue = SameValue;
 $sameValueZero = SameValueZero;
+$spreadIntoArray = SpreadIntoArray;
 $toBoolean = ToBoolean;
 $toInt32 = ToInt32;
 $toInteger = ToInteger;