WIP SharedArrayBuffer implementation

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/conversions.h"
 #include "src/isolate-inl.h"
@@ skipping 1692 matching lines @@
   JSFunction::EnsureHasInitialMap(function);
   Handle<Map> map(function->initial_map());
   DCHECK(map->instance_type() == JS_GENERATOR_OBJECT_TYPE);
   CALL_HEAP_FUNCTION(
       isolate(),
       isolate()->heap()->AllocateJSObjectFromMap(*map),
       JSGeneratorObject);
 }
 
 
-Handle<JSArrayBuffer> Factory::NewJSArrayBuffer() {
+Handle<JSArrayBuffer> Factory::NewJSArrayBuffer(bool is_shared) {
   Handle<JSFunction> array_buffer_fun(
-      isolate()->native_context()->array_buffer_fun());
+      is_shared ? isolate()->native_context()->shared_array_buffer_fun()
+                : isolate()->native_context()->array_buffer_fun());
   CALL_HEAP_FUNCTION(
       isolate(),
       isolate()->heap()->AllocateJSObject(*array_buffer_fun),
       JSArrayBuffer);
 }
 
 
 Handle<JSDataView> Factory::NewJSDataView() {
   Handle<JSFunction> data_view_fun(
       isolate()->native_context()->data_view_fun());
@@ skipping 58 matching lines @@
     TYPED_ARRAYS(TYPED_ARRAY_FUN)
 #undef TYPED_ARRAY_FUN
 
     default:
       UNREACHABLE();
       return NULL;
   }
 }
 
 
+JSFunction* GetSharedTypedArrayFun(ExternalArrayType type, Isolate* isolate) {
+  Context* native_context = isolate->context()->native_context();
+  switch (type) {
+#define SHARED_TYPED_ARRAY_FUN(Type, type, TYPE, ctype, size) \
+  case kExternal##Type##Array:                                \
+    return native_context->shared_##type##_array_fun();
+
+    TYPED_ARRAYS(SHARED_TYPED_ARRAY_FUN)
+#undef SHARED_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 11 matching lines @@
 
   i::Handle<i::Object> byte_length_object =
       isolate->factory()->NewNumberFromSize(byte_length);
   obj->set_byte_length(*byte_length_object);
 }
 
 
 }  // namespace
 
 
-Handle<JSTypedArray> Factory::NewJSTypedArray(ExternalArrayType type) {
-  Handle<JSFunction> typed_array_fun_handle(GetTypedArrayFun(type, isolate()));
+Handle<JSTypedArray> Factory::NewJSTypedArray(ExternalArrayType type,
+                                              bool is_shared) {
+  Handle<JSFunction> typed_array_fun_handle(
+      is_shared ? GetSharedTypedArrayFun(type, isolate())
+                : GetTypedArrayFun(type, 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 byte_offset, size_t length,
+                                              bool is_shared) {
+  Handle<JSTypedArray> obj = NewJSTypedArray(type, is_shared);
 
   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);
+  obj->set_is_shared(is_shared);
 
   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;
 }
 
 
@@ skipping 474 matching lines @@
   return Handle<Object>::null();
 }
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return value ? true_value() : false_value();
 }
 
 
 } }  // namespace v8::internal