int src_index,
int len) {
ASSERT(dst != src); // Use MoveElements instead.
+ ASSERT(len > 0);
CopyWords(dst->data_start() + dst_index,
src->data_start() + src_index,
len);
FixedArray* new_elms = FixedArray::cast(obj);
AssertNoAllocation no_gc;
- CopyElements(&no_gc, new_elms, 0, elms, 0, len);
+ if (len > 0) {
+ CopyElements(&no_gc, new_elms, 0, elms, 0, len);
+ }
FillWithHoles(new_elms, new_length, capacity);
elms = new_elms;
FixedArray* new_elms = FixedArray::cast(obj);
AssertNoAllocation no_gc;
- CopyElements(&no_gc, new_elms, to_add, elms, 0, len);
+ if (len > 0) {
+ CopyElements(&no_gc, new_elms, to_add, elms, 0, len);
+ }
FillWithHoles(new_elms, new_length, capacity);
elms = new_elms;
AssertNoAllocation no_gc;
// Copy the part before actual_start as is.
- CopyElements(&no_gc, new_elms, 0, elms, 0, actual_start);
- CopyElements(&no_gc,
- new_elms, actual_start + item_count,
- elms, actual_start + actual_delete_count,
- (len - actual_delete_count - actual_start));
+ if (actual_start > 0) {
+ CopyElements(&no_gc, new_elms, 0, elms, 0, actual_start);
+ }
+ const int to_copy = len - actual_delete_count - actual_start;
+ if (to_copy > 0) {
+ CopyElements(&no_gc,
+ new_elms, actual_start + item_count,
+ elms, actual_start + actual_delete_count,
+ to_copy);
+ }
FillWithHoles(new_elms, new_length, capacity);
elms = new_elms;
int start_pos = 0;
for (int i = 0; i < n_arguments; i++) {
JSArray* array = JSArray::cast(args[i]);
- FixedArray* elms = FixedArray::cast(array->elements());
int len = Smi::cast(array->length())->value();
- CopyElements(&no_gc, result_elms, start_pos, elms, 0, len);
- start_pos += len;
+ if (len > 0) {
+ FixedArray* elms = FixedArray::cast(array->elements());
+ CopyElements(&no_gc, result_elms, start_pos, elms, 0, len);
+ start_pos += len;
+ }
}
ASSERT(start_pos == result_len);