Remove redudant deleted_count argument from EnqueueSpliceRecord

R=rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/16438010

Patch from Rafael Weinstein <rafaelw@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14989 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/array.js

@@ -399,7 +399,7 @@ function ObservedArrayPop(n) {
   n--;
   var value = this[n];
 
-  EnqueueSpliceRecord(this, n, [value], 1, 0);
+  EnqueueSpliceRecord(this, n, [value], 0);
 
   try {
     BeginPerformSplice(this);
@@ -441,7 +441,7 @@ function ObservedArrayPush() {
   var n = TO_UINT32(this.length);
   var m = %_ArgumentsLength();
 
-  EnqueueSpliceRecord(this, n, [], 0, m);
+  EnqueueSpliceRecord(this, n, [], m);
 
   try {
     BeginPerformSplice(this);
@@ -581,7 +581,7 @@ function ArrayReverse() {
 function ObservedArrayShift(len) {
   var first = this[0];
 
-  EnqueueSpliceRecord(this, 0, [first], 1, 0);
+  EnqueueSpliceRecord(this, 0, [first], 0);
 
   try {
     BeginPerformSplice(this);
@@ -627,7 +627,7 @@ function ObservedArrayUnshift() {
   var len = TO_UINT32(this.length);
   var num_arguments = %_ArgumentsLength();
 
-  EnqueueSpliceRecord(this, 0, [], 0, num_arguments);
+  EnqueueSpliceRecord(this, 0, [], num_arguments);
 
   try {
     BeginPerformSplice(this);
@@ -779,7 +779,6 @@ function ObservedArraySplice(start, delete_count) {
        EnqueueSpliceRecord(this,
                            start_i,
                            deleted_elements.slice(),
-                           deleted_elements.length,
                            num_elements_to_add);
     }
   }

src/object-observe.js

@@ -294,7 +294,7 @@ function EndPerformSplice(array) {
     EndPerformChange(objectInfo, 'splice');
 }
 
-function EnqueueSpliceRecord(array, index, removed, deleteCount, addedCount) {
+function EnqueueSpliceRecord(array, index, removed, addedCount) {
   var objectInfo = objectInfoMap.get(array);
   if (IS_UNDEFINED(objectInfo) || objectInfo.changeObservers.length === 0)
     return;
@@ -307,7 +307,6 @@ function EnqueueSpliceRecord(array, index, removed, deleteCount, addedCount) {
     addedCount: addedCount
   };
 
-  changeRecord.removed.length = deleteCount;
   ObjectFreeze(changeRecord);
   ObjectFreeze(changeRecord.removed);
   EnqueueChangeRecord(changeRecord, objectInfo.changeObservers);

src/objects.cc

@@ -10875,24 +10875,18 @@ static bool GetOldValue(Isolate* isolate,
   return true;
 }
 
-
-// TODO(rafaelw): Remove |delete_count| argument and rely on the length of
-// of |deleted|.
 static void EnqueueSpliceRecord(Handle<JSArray> object,
                                 uint32_t index,
                                 Handle<JSArray> deleted,
-                                uint32_t delete_count,
                                 uint32_t add_count) {
   Isolate* isolate = object->GetIsolate();
   HandleScope scope(isolate);
   Handle<Object> index_object = isolate->factory()->NewNumberFromUint(index);
-  Handle<Object> delete_count_object =
-      isolate->factory()->NewNumberFromUint(delete_count);
   Handle<Object> add_count_object =
       isolate->factory()->NewNumberFromUint(add_count);
 
   Handle<Object> args[] =
-      { object, index_object, deleted, delete_count_object, add_count_object };
+      { object, index_object, deleted, add_count_object };
 
   bool threw;
   Execution::Call(Handle<JSFunction>(isolate->observers_enqueue_splice()),
@@ -10996,14 +10990,18 @@ MaybeObject* JSArray::SetElementsLength(Object* len) {
   uint32_t add_count = new_length > old_length ? new_length - old_length : 0;
   uint32_t delete_count = new_length < old_length ? old_length - new_length : 0;
   Handle<JSArray> deleted = isolate->factory()->NewJSArray(0);
-  if (delete_count) {
+  if (delete_count > 0) {
     for (int i = indices.length() - 1; i >= 0; i--) {
       JSObject::SetElement(deleted, indices[i] - index, old_values[i], NONE,
                            kNonStrictMode);
     }
+
+    SetProperty(deleted, isolate->factory()->length_string(),
+                isolate->factory()->NewNumberFromUint(delete_count),
+                NONE, kNonStrictMode);
   }
 
-  EnqueueSpliceRecord(self, index, deleted, delete_count, add_count);
+  EnqueueSpliceRecord(self, index, deleted, add_count);
 
   return *hresult;
 }
@@ -12069,7 +12067,7 @@ MaybeObject* JSObject::SetElement(uint32_t index,
                           old_length_handle);
       EndPerformSplice(Handle<JSArray>::cast(self));
       Handle<JSArray> deleted = isolate->factory()->NewJSArray(0);
-      EnqueueSpliceRecord(Handle<JSArray>::cast(self), old_length, deleted, 0,
+      EnqueueSpliceRecord(Handle<JSArray>::cast(self), old_length, deleted,
                           new_length - old_length);
     } else {
       EnqueueChangeRecord(self, "new", name, old_value);

src/v8natives.js

@@ -928,7 +928,6 @@ function DefineArrayProperty(obj, p, desc, should_throw) {
       EnqueueSpliceRecord(obj,
           new_length < old_length ? new_length : old_length,
           removed,
-          removed.length,
           new_length > old_length ? new_length - old_length : 0);
     }
     if (threw) {
@@ -967,7 +966,7 @@ function DefineArrayProperty(obj, p, desc, should_throw) {
     }
     if (emit_splice) {
       EndPerformSplice(obj);
-      EnqueueSpliceRecord(obj, length, [], 0, index + 1 - length);
+      EnqueueSpliceRecord(obj, length, [], index + 1 - length);
     }
     return true;
   }