[wasm] Introduce instance types for WebAssembly.* objects.

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 7703 matching lines @@
   i::Handle<i::JSReceiver> target = Utils::OpenHandle(*local_target);
   i::Handle<i::JSReceiver> handler = Utils::OpenHandle(*local_handler);
   Local<Proxy> result;
   has_pending_exception =
       !ToLocal<Proxy>(i::JSProxy::New(isolate, target, handler), &result);
   RETURN_ON_FAILED_EXECUTION(Proxy);
   RETURN_ESCAPED(result);
 }
 
 Local<String> WasmCompiledModule::GetWasmWireBytes() {
-  i::Handle<i::JSObject> obj =
-      i::Handle<i::JSObject>::cast(Utils::OpenHandle(this));
+  i::Handle<i::WasmModuleObject> obj =
+      i::Handle<i::WasmModuleObject>::cast(Utils::OpenHandle(this));
   i::Handle<i::WasmCompiledModule> compiled_part =
-      i::handle(i::WasmCompiledModule::cast(obj->GetEmbedderField(0)));
+      i::handle(i::WasmCompiledModule::cast(obj->compiled_module()));
   i::Handle<i::String> wire_bytes(compiled_part->module_bytes());
   return Local<String>::Cast(Utils::ToLocal(wire_bytes));
 }
 
 // Currently, wasm modules are bound, both to Isolate and to
 // the Context they were created in. The currently-supported means to
 // decontextualize and then re-contextualize a module is via
 // serialization/deserialization.
 WasmCompiledModule::TransferrableModule
 WasmCompiledModule::GetTransferrableModule() {
@@ skipping 15 matching lines @@
 MaybeLocal<WasmCompiledModule> WasmCompiledModule::FromTransferrableModule(
     Isolate* isolate,
     const WasmCompiledModule::TransferrableModule& transferrable_module) {
   MaybeLocal<WasmCompiledModule> ret =
       Deserialize(isolate, AsCallerOwned(transferrable_module.compiled_code),
                   AsCallerOwned(transferrable_module.wire_bytes));
   return ret;
 }
 
 WasmCompiledModule::SerializedModule WasmCompiledModule::Serialize() {
-  i::Handle<i::JSObject> obj =
-      i::Handle<i::JSObject>::cast(Utils::OpenHandle(this));
+  i::Handle<i::WasmModuleObject> obj =
+      i::Handle<i::WasmModuleObject>::cast(Utils::OpenHandle(this));
   i::Handle<i::WasmCompiledModule> compiled_part =
-      i::handle(i::WasmCompiledModule::cast(obj->GetEmbedderField(0)));
+      i::handle(i::WasmCompiledModule::cast(obj->compiled_module()));
 
   std::unique_ptr<i::ScriptData> script_data =
       i::WasmCompiledModuleSerializer::SerializeWasmModule(obj->GetIsolate(),
                                                            compiled_part);
   script_data->ReleaseDataOwnership();
 
   size_t size = static_cast<size_t>(script_data->length());
   return {std::unique_ptr<const uint8_t[]>(script_data->data()), size};
 }
 
@@ skipping 2862 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8