Migrate %TypedArray%.prototype.fill to C++

src/builtins/builtins-typedarray.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/builtins/builtins-utils.h"
 #include "src/builtins/builtins.h"
 #include "src/code-stub-assembler.h"
 #include "src/counters.h"
 #include "src/elements.h"
 #include "src/objects-inl.h"
@@ skipping 503 matching lines @@
   to = to * element_size;
   from = from * element_size;
   count = count * element_size;
 
   uint8_t* data = static_cast<uint8_t*>(elements->DataPtr());
   std::memmove(data + to, data + from, count);
 
   return *array;
 }
 
+BUILTIN(TypedArrayPrototypeFill) {
+  HandleScope scope(isolate);
+
+  Handle<JSTypedArray> array;
+  const char* method = "%TypedArray%.prototype.fill";
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, array, JSTypedArray::Validate(isolate, args.receiver(), method));
+
+  if (V8_UNLIKELY(array->WasNeutered())) return *array;
+
+  int64_t len = array->length_value();
+  int64_t start = 0;
+  int64_t end = len;
+
+  if (args.length() > 2) {
+    Handle<Object> num = args.atOrUndefined(isolate, 2);
+    if (!num->IsUndefined(isolate)) {
+      ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+          isolate, num, Object::ToInteger(isolate, num));
+      start = CapRelativeIndex(num, 0, len);
+
+      num = args.atOrUndefined(isolate, 3);
+      if (!num->IsUndefined(isolate)) {
+        ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+            isolate, num, Object::ToInteger(isolate, num));
+        end = CapRelativeIndex(num, 0, len);
+      }
+    }
+  }
+
+  int64_t count = end - start;
+  if (count <= 0) return *array;
+
+  if (V8_UNLIKELY(array->WasNeutered())) return *array;
+
+  // Ensure processed indexes are within array bounds
+  DCHECK_GE(start, 0);
+  DCHECK_LT(start, len);
+  DCHECK_GE(end, 0);
+  DCHECK_LE(end, len);
+  DCHECK_LE(count, len);
+
+  Handle<Object> obj_value = args.atOrUndefined(isolate, 1);
+
+  return array->GetElementsAccessor()->Fill(isolate, array, obj_value,
+                                            static_cast<uint32_t>(start),
+                                            static_cast<uint32_t>(end));
+}
+
 BUILTIN(TypedArrayPrototypeIncludes) {
   HandleScope scope(isolate);
 
   Handle<JSTypedArray> array;
   const char* method = "%TypedArray%.prototype.includes";
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, array, JSTypedArray::Validate(isolate, args.receiver(), method));
 
   if (args.length() < 2) return isolate->heap()->false_value();
 
@@ skipping 12 matching lines @@
   Handle<Object> search_element = args.at<Object>(1);
   ElementsAccessor* elements = array->GetElementsAccessor();
   Maybe<bool> result = elements->IncludesValue(isolate, array, search_element,
                                                static_cast<uint32_t>(index),
                                                static_cast<uint32_t>(len));
   return *isolate->factory()->ToBoolean(result.FromJust());
 }
 
 }  // namespace internal
 }  // namespace v8