WIP SharedArrayBuffer implementation

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 3030 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");
 }
 
 
 void v8::TypedArray::CheckCast(Value* that) {
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
-  Utils::ApiCheck(obj->IsJSTypedArray(),
-                  "v8::TypedArray::Cast()",
-                  "Could not convert to TypedArray");
+  Utils::ApiCheck(
+      obj->IsJSTypedArray() && !i::JSTypedArray::cast(*obj)->is_shared(),
+      "v8::TypedArray::Cast()", "Could not convert to TypedArray");
 }
 
 
 #define CHECK_TYPED_ARRAY_CAST(Type, typeName, TYPE, ctype, size)             \
   void v8::Type##Array::CheckCast(Value* that) {                              \
     i::Handle<i::Object> obj = Utils::OpenHandle(that);                       \
-    Utils::ApiCheck(obj->IsJSTypedArray() &&                                  \
-                    i::JSTypedArray::cast(*obj)->type() ==                    \
-                        kExternal##Type##Array,                               \
-                    "v8::" #Type "Array::Cast()",                             \
-                    "Could not convert to " #Type "Array");                   \
+    Utils::ApiCheck(                                                          \
+        obj->IsJSTypedArray() &&                                              \
+            i::JSTypedArray::cast(*obj)->type() == kExternal##Type##Array &&  \
+            !i::JSTypedArray::cast(*obj)->is_shared(),                        \
+        "v8::" #Type "Array::Cast()", "Could not convert to " #Type "Array"); \
   }
 
 
 TYPED_ARRAYS(CHECK_TYPED_ARRAY_CAST)
 
 #undef CHECK_TYPED_ARRAY_CAST
 
 
 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::SharedTypedArray::CheckCast(Value* that) {
+  i::Handle<i::Object> obj = Utils::OpenHandle(that);
+  Utils::ApiCheck(
+      obj->IsJSTypedArray() && i::JSTypedArray::cast(*obj)->is_shared(),
+      "v8::SharedTypedArray::Cast()", "Could not convert to SharedTypedArray");
+}
+
+
+#define CHECK_SHARED_TYPED_ARRAY_CAST(Type, typeName, TYPE, ctype, size)     \
+  void v8::Shared##Type##Array::CheckCast(Value* that) {                     \
+    i::Handle<i::Object> obj = Utils::OpenHandle(that);                      \
+    Utils::ApiCheck(                                                         \
+        obj->IsJSTypedArray() &&                                             \
+            i::JSTypedArray::cast(*obj)->type() == kExternal##Type##Array && \
+            i::JSTypedArray::cast(*obj)->is_shared(),                        \
+        "v8::Shared" #Type "Array::Cast()",                                  \
+        "Could not convert to Shared" #Type "Array");                        \
+  }
+
+
+TYPED_ARRAYS(CHECK_SHARED_TYPED_ARRAY_CAST)
+
+#undef CHECK_SHARED_TYPED_ARRAY_CAST
+
+
 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 2314 matching lines @@
 
 void v8::V8::SetArrayBufferAllocator(
     ArrayBuffer::Allocator* allocator) {
   if (!Utils::ApiCheck(i::V8::ArrayBufferAllocator() == NULL,
                        "v8::V8::SetArrayBufferAllocator",
                        "ArrayBufferAllocator might only be set once"))
     return;
   i::V8::SetArrayBufferAllocator(allocator);
 }
 
+void v8::V8::SetSharedArrayBufferAllocator(
+    SharedArrayBuffer::Allocator* allocator) {
+  if (!Utils::ApiCheck(i::V8::SharedArrayBufferAllocator() == NULL,
+                       "v8::V8::SetSharedArrayBufferAllocator",
+                       "SharedArrayBufferAllocator might only be set once"))
+    return;
+  i::V8::SetSharedArrayBufferAllocator(allocator);
+}
+
 
 bool v8::V8::Dispose() {
   i::V8::TearDown();
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
   i::DisposeNatives();
 #endif
   return true;
 }
 
 
@@ skipping 940 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(false);
   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) {
   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(false);
   i::Runtime::SetupArrayBuffer(i_isolate, obj, true, 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;
   if (obj->IsJSDataView()) {
     i::Handle<i::JSDataView> data_view(i::JSDataView::cast(*obj));
@@ skipping 66 matching lines @@
             "v8::" #Type "Array::New(Handle<ArrayBuffer>, size_t, size_t)"); \
     ENTER_V8(isolate);                                                       \
     if (!Utils::ApiCheck(length <= static_cast<size_t>(i::Smi::kMaxValue),   \
                          "v8::" #Type                                        \
                          "Array::New(Handle<ArrayBuffer>, size_t, size_t)",  \
                          "length exceeds max allowed value")) {              \
       return Local<Type##Array>();                                           \
     }                                                                        \
     i::Handle<i::JSArrayBuffer> buffer = Utils::OpenHandle(*array_buffer);   \
     i::Handle<i::JSTypedArray> obj = isolate->factory()->NewJSTypedArray(    \
-        v8::kExternal##Type##Array, buffer, byte_offset, length);            \
+        v8::kExternal##Type##Array, buffer, byte_offset, length, false);     \
     return Utils::ToLocal##Type##Array(obj);                                 \
   }
 
 
 TYPED_ARRAYS(TYPED_ARRAY_NEW)
 #undef TYPED_ARRAY_NEW
 
 Local<DataView> DataView::New(Handle<ArrayBuffer> array_buffer,
                               size_t byte_offset, size_t byte_length) {
   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> obj = Utils::OpenHandle(this);
+  Utils::ApiCheck(!obj->is_external(), "v8::SharedArrayBuffer::Externalize",
+                  "SharedArrayBuffer already externalized");
+  obj->set_is_external(true);
+  size_t byte_length = static_cast<size_t>(obj->byte_length()->Number());
+  Contents contents;
+  contents.data_ = obj->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(true);
+  i::Runtime::SetupArrayBufferAllocatingData(i_isolate, obj, byte_length, true,
+                                             true);
+  return Utils::ToLocalShared(obj);
+}
+
+
+Local<SharedArrayBuffer> v8::SharedArrayBuffer::New(Isolate* isolate,
+                                                    void* data,
+                                                    size_t byte_length) {
+  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(true);
+  i::Runtime::SetupArrayBuffer(i_isolate, obj, true, data, byte_length, true);
+  return Utils::ToLocalShared(obj);
+}
+
+
+Local<SharedArrayBuffer> v8::SharedTypedArray::Buffer() {
+  i::Handle<i::JSTypedArray> obj = Utils::OpenHandle(this);
+  i::Handle<i::JSArrayBuffer> buffer = i::JSTypedArray::cast(*obj)->GetBuffer();
+  return Utils::ToLocalShared(buffer);
+}
+
+
+size_t v8::SharedTypedArray::ByteOffset() {
+  i::Handle<i::JSTypedArray> obj = Utils::OpenHandle(this);
+  return static_cast<size_t>(obj->byte_offset()->Number());
+}
+
+
+size_t v8::SharedTypedArray::ByteLength() {
+  i::Handle<i::JSTypedArray> obj = Utils::OpenHandle(this);
+  return static_cast<size_t>(obj->byte_length()->Number());
+}
+
+
+size_t v8::SharedTypedArray::Length() {
+  i::Handle<i::JSTypedArray> obj = Utils::OpenHandle(this);
+  return static_cast<size_t>(obj->length()->Number());
+}
+
+
+#define SHARED_TYPED_ARRAY_NEW(Type, type, TYPE, ctype, size)                  \
+  Local<Shared##Type##Array> Shared##Type##Array::New(                         \
+      Handle<SharedArrayBuffer> array_buffer, size_t byte_offset,              \
+      size_t length) {                                                         \
+    i::Isolate* isolate = Utils::OpenHandle(*array_buffer)->GetIsolate();      \
+    LOG_API(isolate, "v8::Shared" #Type                                        \
+                     "Array::New(Handle<SharedArrayBuffer>, size_t, size_t)"); \
+    ENTER_V8(isolate);                                                         \
+    if (!Utils::ApiCheck(                                                      \
+            length <= static_cast<size_t>(i::Smi::kMaxValue),                  \
+            "v8::Shared" #Type                                                 \
+            "Array::New(Handle<SharedArrayBuffer>, size_t, size_t)",           \
+            "length exceeds max allowed value")) {                             \
+      return Local<Shared##Type##Array>();                                     \
+    }                                                                          \
+    i::Handle<i::JSArrayBuffer> buffer = Utils::OpenHandle(*array_buffer);     \
+    i::Handle<i::JSTypedArray> obj = isolate->factory()->NewJSTypedArray(      \
+        v8::kExternal##Type##Array, buffer, byte_offset, length, true);        \
+    return Utils::ToLocalShared##Type##Array(obj);                             \
+  }
+
+
+TYPED_ARRAYS(SHARED_TYPED_ARRAY_NEW)
+#undef SHARED_TYPED_ARRAY_NEW
+
+
 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 1563 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