Reland "LayoutDescriptor should inherit from JSTypedArray"

src/factory.cc

 // Copyright 2014 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/factory.h"
 
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/conversions.h"
@@ skipping 1807 matching lines @@
 #undef TYPED_ARRAY_CASE
 }
 
 
 size_t GetExternalArrayElementSize(ExternalArrayType type) {
   switch (type) {
 #define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
   case kExternal##Type##Array:                          \
     return size;
     TYPED_ARRAYS(TYPED_ARRAY_CASE)
+    default:
+      UNREACHABLE();
+      return 0;
   }
-  UNREACHABLE();
-  return 0;
 #undef TYPED_ARRAY_CASE
 }
 
+
+size_t GetFixedTypedArraysElementSize(ElementsKind kind) {
+  switch (kind) {
+#define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
+  case TYPE##_ELEMENTS:                                 \
+    return size;
+    TYPED_ARRAYS(TYPED_ARRAY_CASE)
+    default:
+      UNREACHABLE();
+      return 0;
+  }
+#undef TYPED_ARRAY_CASE
+}
+
+
+ExternalArrayType GetArrayTypeFromElementsKind(ElementsKind kind) {
+  switch (kind) {
+#define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
+  case TYPE##_ELEMENTS:                                 \
+    return kExternal##Type##Array;
+    TYPED_ARRAYS(TYPED_ARRAY_CASE)
+    default:
+      UNREACHABLE();
+      return kExternalInt8Array;
+  }
+#undef TYPED_ARRAY_CASE
+}
+
 
 JSFunction* GetTypedArrayFun(ExternalArrayType type, Isolate* isolate) {
   Context* native_context = isolate->context()->native_context();
   switch (type) {
 #define TYPED_ARRAY_FUN(Type, type, TYPE, ctype, size)                        \
     case kExternal##Type##Array:                                              \
       return native_context->type##_array_fun();
 
     TYPED_ARRAYS(TYPED_ARRAY_FUN)
 #undef TYPED_ARRAY_FUN
 
     default:
       UNREACHABLE();
       return NULL;
   }
 }
 
 
+JSFunction* GetTypedArrayFun(ElementsKind elements_kind, Isolate* isolate) {
+  Context* native_context = isolate->context()->native_context();
+  switch (elements_kind) {
+#define TYPED_ARRAY_FUN(Type, type, TYPE, ctype, size) \
+  case TYPE##_ELEMENTS:                                \
+    return native_context->type##_array_fun();
+
+    TYPED_ARRAYS(TYPED_ARRAY_FUN)
+#undef TYPED_ARRAY_FUN
+
+    default:
+      UNREACHABLE();
+      return NULL;
+  }
+}
+
+
 void SetupArrayBufferView(i::Isolate* isolate,
                           i::Handle<i::JSArrayBufferView> obj,
                           i::Handle<i::JSArrayBuffer> buffer,
                           size_t byte_offset, size_t byte_length) {
   DCHECK(byte_offset + byte_length <=
          static_cast<size_t>(buffer->byte_length()->Number()));
 
   obj->set_buffer(*buffer);
 
   Heap* heap = isolate->heap();
@@ skipping 21 matching lines @@
 Handle<JSTypedArray> Factory::NewJSTypedArray(ExternalArrayType type) {
   Handle<JSFunction> typed_array_fun_handle(GetTypedArrayFun(type, isolate()));
 
   CALL_HEAP_FUNCTION(
       isolate(),
       isolate()->heap()->AllocateJSObject(*typed_array_fun_handle),
       JSTypedArray);
 }
 
 
+Handle<JSTypedArray> Factory::NewJSTypedArray(ElementsKind elements_kind) {
+  Handle<JSFunction> typed_array_fun_handle(
+      GetTypedArrayFun(elements_kind, isolate()));
+
+  CALL_HEAP_FUNCTION(
+      isolate(), isolate()->heap()->AllocateJSObject(*typed_array_fun_handle),
+      JSTypedArray);
+}
+
+
 Handle<JSTypedArray> Factory::NewJSTypedArray(ExternalArrayType type,
                                               Handle<JSArrayBuffer> buffer,
                                               size_t byte_offset,
                                               size_t length) {
   Handle<JSTypedArray> obj = NewJSTypedArray(type);
 
   size_t element_size = GetExternalArrayElementSize(type);
   ElementsKind elements_kind = GetExternalArrayElementsKind(type);
 
   CHECK(byte_offset % element_size == 0);
 
   CHECK(length <= (std::numeric_limits<size_t>::max() / element_size));
   CHECK(length <= static_cast<size_t>(Smi::kMaxValue));
   size_t byte_length = length * element_size;
   SetupArrayBufferView(isolate(), obj, buffer, byte_offset, byte_length);
 
   Handle<Object> length_object = NewNumberFromSize(length);
   obj->set_length(*length_object);
 
   Handle<ExternalArray> elements = NewExternalArray(
       static_cast<int>(length), type,
       static_cast<uint8_t*>(buffer->backing_store()) + byte_offset);
   Handle<Map> map = JSObject::GetElementsTransitionMap(obj, elements_kind);
   JSObject::SetMapAndElements(obj, map, elements);
   return obj;
 }
 
 
+Handle<JSTypedArray> Factory::NewJSTypedArray(ElementsKind elements_kind,
+                                              size_t number_of_elements) {
+  Handle<JSTypedArray> obj = NewJSTypedArray(elements_kind);
+
+  size_t element_size = GetFixedTypedArraysElementSize(elements_kind);
+  ExternalArrayType array_type = GetArrayTypeFromElementsKind(elements_kind);
+
+  CHECK(number_of_elements <=
+        (std::numeric_limits<size_t>::max() / element_size));
+  CHECK(number_of_elements <= static_cast<size_t>(Smi::kMaxValue));
+  size_t byte_length = number_of_elements * element_size;
+
+  obj->set_byte_offset(Smi::FromInt(0));
+  i::Handle<i::Object> byte_length_object =
+      isolate()->factory()->NewNumberFromSize(byte_length);
+  obj->set_byte_length(*byte_length_object);
+  Handle<Object> length_object = NewNumberFromSize(number_of_elements);
+  obj->set_length(*length_object);
+
+  obj->set_buffer(Smi::FromInt(0));
+  obj->set_weak_next(isolate()->heap()->undefined_value());
+  Handle<FixedTypedArrayBase> elements =
+      isolate()->factory()->NewFixedTypedArray(
+          static_cast<int>(number_of_elements), array_type);
+  obj->set_elements(*elements);
+  return obj;
+}
+
+
 Handle<JSDataView> Factory::NewJSDataView(Handle<JSArrayBuffer> buffer,
                                           size_t byte_offset,
                                           size_t byte_length) {
   Handle<JSDataView> obj = NewJSDataView();
   SetupArrayBufferView(isolate(), obj, buffer, byte_offset, byte_length);
   return obj;
 }
 
 
 Handle<JSProxy> Factory::NewJSProxy(Handle<Object> handler,
@@ skipping 466 matching lines @@
   return Handle<Object>::null();
 }
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return value ? true_value() : false_value();
 }
 
 
 } }  // namespace v8::internal