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 321 matching lines @@
   virtual void Free(void* data, size_t) { free(data); }
 };
 
 }  // namespace
 
 
 StartupData V8::CreateSnapshotDataBlob(const char* custom_source) {
   i::Isolate* internal_isolate = new i::Isolate(true);
   ArrayBufferAllocator allocator;
   internal_isolate->set_array_buffer_allocator(&allocator);
+  internal_isolate->set_shared_array_buffer_allocator(&allocator);
   Isolate* isolate = reinterpret_cast<Isolate*>(internal_isolate);
   StartupData result = {NULL, 0};
   {
     base::ElapsedTimer timer;
     timer.Start();
     Isolate::Scope isolate_scope(isolate);
     internal_isolate->Init(NULL);
     Persistent<Context> context;
     i::Snapshot::Metadata metadata;
     {
@@ skipping 2321 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();
+  i::Handle<i::Object> obj = Utils::OpenHandle(this);
+  return obj->IsJSArrayBufferView() &&
+         !i::JSArrayBufferView::cast(*obj)->is_shared();
 }
 
 
 bool Value::IsTypedArray() const {
-  return Utils::OpenHandle(this)->IsJSTypedArray();
+  i::Handle<i::Object> obj = Utils::OpenHandle(this);
+  return obj->IsJSTypedArray() && !i::JSTypedArray::cast(*obj)->is_shared();
 }
 
 
-#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; \
+#define VALUE_IS_TYPED_ARRAY(Type, typeName, TYPE, ctype, size) \
+  bool Value::Is##Type##Array() const {                         \
+    i::Handle<i::Object> obj = Utils::OpenHandle(this);         \
+    if (!obj->IsJSTypedArray()) return false;                   \
+    i::JSTypedArray* typed_array = i::JSTypedArray::cast(*obj); \
+    return typed_array->type() == i::kExternal##Type##Array &&  \
+           !typed_array->is_shared();                           \
   }
 
+
 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::IsSharedTypedArray() const {
+  i::Handle<i::Object> obj = Utils::OpenHandle(this);
+  return obj->IsJSTypedArray() && i::JSTypedArray::cast(*obj)->is_shared();
+}
+
+
+#define VALUE_IS_SHARED_TYPED_ARRAY(Type, typeName, TYPE, ctype, size)    \
+  bool Value::IsShared##Type##Array() const {                             \
+    i::Handle<i::Object> obj = Utils::OpenHandle(this);                   \
+    if (!obj->IsJSTypedArray()) return false;                             \
+    i::JSTypedArray* typed_array = i::JSTypedArray::cast(*obj);           \
+    return typed_array->type() == v8::internal::kExternal##Type##Array && \
+           typed_array->is_shared();                                      \
+  }
+
+
+TYPED_ARRAYS(VALUE_IS_SHARED_TYPED_ARRAY)
+
+#undef VALUE_IS_SHARED_TYPED_ARRAY
+
+
 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");
 }
 
 
 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() == i::kExternal##Type##Array, \
-        "v8::" #Type "Array::Cast()", "Could not convert to " #Type "Array"); \
+#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() ==     \
+                            i::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() ==           \
+                            i::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 2173 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);
 }
 
-
 bool v8::V8::Dispose() {
   i::V8::TearDown();
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
   i::DisposeNatives();
 #endif
   return true;
 }
 
 
 HeapStatistics::HeapStatistics(): total_heap_size_(0),
@@ skipping 945 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::NOT_SHARED);
   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::NOT_SHARED);
   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 65 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(    \
-        i::kExternal##Type##Array, buffer, byte_offset, length);             \
+        i::kExternal##Type##Array, buffer, byte_offset, length,              \
+        i::NOT_SHARED);                                                      \
     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> 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::SHARED);
+  i::Runtime::SetupArrayBufferAllocatingData(i_isolate, obj, byte_length);
+  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::SHARED);
+  i::Runtime::SetupArrayBuffer(i_isolate, obj,
+                               mode == ArrayBufferCreationMode::kExternalized,
+                               data, byte_length);
+  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(      \
+        i::kExternal##Type##Array, buffer, byte_offset, length, i::SHARED);    \
+    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 326 matching lines @@
 
 
 Isolate* Isolate::New(const Isolate::CreateParams& params) {
   i::Isolate* isolate = new i::Isolate(false);
   Isolate* v8_isolate = reinterpret_cast<Isolate*>(isolate);
   if (params.array_buffer_allocator != NULL) {
     isolate->set_array_buffer_allocator(params.array_buffer_allocator);
   } else {
     isolate->set_array_buffer_allocator(i::V8::ArrayBufferAllocator());
   }
+  if (params.shared_array_buffer_allocator) {
+    isolate->set_shared_array_buffer_allocator(
+        params.shared_array_buffer_allocator);
+  } else {
+    // Default to using the same allocator as the array_buffer_allocator.
+    isolate->set_shared_array_buffer_allocator(
+        isolate->array_buffer_allocator());
+  }
   if (params.snapshot_blob != NULL) {
     isolate->set_snapshot_blob(params.snapshot_blob);
   } else {
     isolate->set_snapshot_blob(i::Snapshot::DefaultSnapshotBlob());
   }
   if (params.entry_hook) {
     isolate->set_function_entry_hook(params.entry_hook);
   }
   if (params.code_event_handler) {
     isolate->InitializeLoggingAndCounters();
@@ skipping 1266 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