Implement SharedArrayBuffer

src/api.cc

 // Copyright 2012 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/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 2661 matching lines @@
   return Utils::OpenHandle(this)->IsSymbol();
 }
 
 
 bool Value::IsArray() const {
   return Utils::OpenHandle(this)->IsJSArray();
 }
 
 
 bool Value::IsArrayBuffer() const {
-  return Utils::OpenHandle(this)->IsJSArrayBuffer();
+  i::Handle<i::Object> obj = Utils::OpenHandle(this);
+  return obj->IsJSArrayBuffer() && !i::JSArrayBuffer::cast(*obj)->is_shared();
 }
 
 
 bool Value::IsArrayBufferView() const {
   return Utils::OpenHandle(this)->IsJSArrayBufferView();
 }
 
 
 bool Value::IsTypedArray() const {
   return Utils::OpenHandle(this)->IsJSTypedArray();
 }
 
 
 #define VALUE_IS_TYPED_ARRAY(Type, typeName, TYPE, ctype, size)              \
   bool Value::Is##Type##Array() const {                                      \
     i::Handle<i::Object> obj = Utils::OpenHandle(this);                      \
     return obj->IsJSTypedArray() &&                                          \
            i::JSTypedArray::cast(*obj)->type() == i::kExternal##Type##Array; \
   }
 
+
 TYPED_ARRAYS(VALUE_IS_TYPED_ARRAY)
 
 #undef VALUE_IS_TYPED_ARRAY
 
 
 bool Value::IsDataView() const {
   return Utils::OpenHandle(this)->IsJSDataView();
 }
 
 
+bool Value::IsSharedArrayBuffer() const {
+  i::Handle<i::Object> obj = Utils::OpenHandle(this);
+  return obj->IsJSArrayBuffer() && i::JSArrayBuffer::cast(*obj)->is_shared();
+}
+
+
 bool Value::IsObject() const {
   return Utils::OpenHandle(this)->IsJSObject();
 }
 
 
 bool Value::IsNumber() const {
   return Utils::OpenHandle(this)->IsNumber();
 }
 
 
@@ skipping 356 matching lines @@
 
 void v8::Promise::Resolver::CheckCast(Value* that) {
   Utils::ApiCheck(that->IsPromise(),
                   "v8::Promise::Resolver::Cast()",
                   "Could not convert to promise resolver");
 }
 
 
 void v8::ArrayBuffer::CheckCast(Value* that) {
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
-  Utils::ApiCheck(obj->IsJSArrayBuffer(),
-                  "v8::ArrayBuffer::Cast()",
-                  "Could not convert to ArrayBuffer");
+  Utils::ApiCheck(
+      obj->IsJSArrayBuffer() && !i::JSArrayBuffer::cast(*obj)->is_shared(),
+      "v8::ArrayBuffer::Cast()", "Could not convert to ArrayBuffer");
 }
 
 
 void v8::ArrayBufferView::CheckCast(Value* that) {
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   Utils::ApiCheck(obj->IsJSArrayBufferView(),
                   "v8::ArrayBufferView::Cast()",
                   "Could not convert to ArrayBufferView");
 }
 
@@ skipping 22 matching lines @@
 
 
 void v8::DataView::CheckCast(Value* that) {
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   Utils::ApiCheck(obj->IsJSDataView(),
                   "v8::DataView::Cast()",
                   "Could not convert to DataView");
 }
 
 
+void v8::SharedArrayBuffer::CheckCast(Value* that) {
+  i::Handle<i::Object> obj = Utils::OpenHandle(that);
+  Utils::ApiCheck(
+      obj->IsJSArrayBuffer() && i::JSArrayBuffer::cast(*obj)->is_shared(),
+      "v8::SharedArrayBuffer::Cast()",
+      "Could not convert to SharedArrayBuffer");
+}
+
+
 void v8::Date::CheckCast(v8::Value* that) {
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   i::Isolate* isolate = NULL;
   if (obj->IsHeapObject()) isolate = i::HeapObject::cast(*obj)->GetIsolate();
   Utils::ApiCheck(isolate != NULL &&
                   obj->HasSpecificClassOf(isolate->heap()->Date_string()),
                   "v8::Date::Cast()",
                   "Could not convert to date");
 }
 
@@ skipping 3126 matching lines @@
   i::Handle<i::JSArrayBuffer> obj = Utils::OpenHandle(this);
   return static_cast<size_t>(obj->byte_length()->Number());
 }
 
 
 Local<ArrayBuffer> v8::ArrayBuffer::New(Isolate* isolate, size_t byte_length) {
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   LOG_API(i_isolate, "v8::ArrayBuffer::New(size_t)");
   ENTER_V8(i_isolate);
   i::Handle<i::JSArrayBuffer> obj =
-      i_isolate->factory()->NewJSArrayBuffer();
+      i_isolate->factory()->NewJSArrayBuffer(i::SharedFlag::kNotShared);
   i::Runtime::SetupArrayBufferAllocatingData(i_isolate, obj, byte_length);
   return Utils::ToLocal(obj);
 }
 
 
 Local<ArrayBuffer> v8::ArrayBuffer::New(Isolate* isolate, void* data,
                                         size_t byte_length,
                                         ArrayBufferCreationMode mode) {
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   LOG_API(i_isolate, "v8::ArrayBuffer::New(void*, size_t)");
   ENTER_V8(i_isolate);
   i::Handle<i::JSArrayBuffer> obj =
-      i_isolate->factory()->NewJSArrayBuffer();
+      i_isolate->factory()->NewJSArrayBuffer(i::SharedFlag::kNotShared);
   i::Runtime::SetupArrayBuffer(i_isolate, obj,
                                mode == ArrayBufferCreationMode::kExternalized,
                                data, byte_length);
   return Utils::ToLocal(obj);
 }
 
 
 Local<ArrayBuffer> v8::ArrayBufferView::Buffer() {
   i::Handle<i::JSArrayBufferView> obj = Utils::OpenHandle(this);
   i::Handle<i::JSArrayBuffer> buffer;
@@ skipping 85 matching lines @@
   i::Handle<i::JSArrayBuffer> buffer = Utils::OpenHandle(*array_buffer);
   i::Isolate* isolate = buffer->GetIsolate();
   LOG_API(isolate, "v8::DataView::New(void*, size_t, size_t)");
   ENTER_V8(isolate);
   i::Handle<i::JSDataView> obj =
       isolate->factory()->NewJSDataView(buffer, byte_offset, byte_length);
   return Utils::ToLocal(obj);
 }
 
 
+bool v8::SharedArrayBuffer::IsExternal() const {
+  return Utils::OpenHandle(this)->is_external();
+}
+
+
+v8::SharedArrayBuffer::Contents v8::SharedArrayBuffer::Externalize() {
+  i::Handle<i::JSArrayBuffer> self = Utils::OpenHandle(this);
+  i::Isolate* isolate = self->GetIsolate();
+  Utils::ApiCheck(!self->is_external(), "v8::SharedArrayBuffer::Externalize",
+                  "SharedArrayBuffer already externalized");
+  self->set_is_external(true);
+  isolate->heap()->UnregisterArrayBuffer(self->backing_store());
+  return GetContents();
+}
+
+
+v8::SharedArrayBuffer::Contents v8::SharedArrayBuffer::GetContents() {
+  i::Handle<i::JSArrayBuffer> self = Utils::OpenHandle(this);
+  size_t byte_length = static_cast<size_t>(self->byte_length()->Number());
+  Contents contents;
+  contents.data_ = self->backing_store();
+  contents.byte_length_ = byte_length;
+  return contents;
+}
+
+
+size_t v8::SharedArrayBuffer::ByteLength() const {
+  i::Handle<i::JSArrayBuffer> obj = Utils::OpenHandle(this);
+  return static_cast<size_t>(obj->byte_length()->Number());
+}
+
+
+Local<SharedArrayBuffer> v8::SharedArrayBuffer::New(Isolate* isolate,
+                                                    size_t byte_length) {
+  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
+  LOG_API(i_isolate, "v8::SharedArrayBuffer::New(size_t)");
+  ENTER_V8(i_isolate);
+  i::Handle<i::JSArrayBuffer> obj =
+      i_isolate->factory()->NewJSArrayBuffer(i::SharedFlag::kShared);
+  i::Runtime::SetupArrayBufferAllocatingData(i_isolate, obj, byte_length, true,
+                                             i::SharedFlag::kShared);
+  return Utils::ToLocalShared(obj);
+}
+
+
+Local<SharedArrayBuffer> v8::SharedArrayBuffer::New(
+    Isolate* isolate, void* data, size_t byte_length,
+    ArrayBufferCreationMode mode) {
+  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
+  LOG_API(i_isolate, "v8::SharedArrayBuffer::New(void*, size_t)");
+  ENTER_V8(i_isolate);
+  i::Handle<i::JSArrayBuffer> obj =
+      i_isolate->factory()->NewJSArrayBuffer(i::SharedFlag::kShared);
+  i::Runtime::SetupArrayBuffer(i_isolate, obj,
+                               mode == ArrayBufferCreationMode::kExternalized,
+                               data, byte_length, i::SharedFlag::kShared);
+  return Utils::ToLocalShared(obj);
+}
+
+
 Local<Symbol> v8::Symbol::New(Isolate* isolate, Local<String> name) {
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   LOG_API(i_isolate, "Symbol::New()");
   ENTER_V8(i_isolate);
   i::Handle<i::Symbol> result = i_isolate->factory()->NewSymbol();
   if (!name.IsEmpty()) result->set_name(*Utils::OpenHandle(*name));
   return Utils::ToLocal(result);
 }
 
 
@@ skipping 1612 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal