[ES6 modules] Implement #concept-module-script-instantiation-error

third_party/WebKit/Source/core/dom/ModuleScript.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ModuleScript_h
 #define ModuleScript_h
 
 #include "bindings/core/v8/ScriptModule.h"
+#include "bindings/core/v8/ScriptValue.h"
 #include "bindings/core/v8/ScriptWrappable.h"
+#include "bindings/core/v8/TraceWrapperV8Reference.h"
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 #include "platform/loader/fetch/ResourceLoaderOptions.h"
 #include "platform/weborigin/KURL.h"
 #include "public/platform/WebURLRequest.h"
 
 namespace blink {
 
 // https://html.spec.whatwg.org/multipage/webappapis.html#concept-module-script-instantiation-state
 enum class ModuleInstantiationState {
@@ skipping 16 matching lines @@
       WebURLRequest::FetchCredentialsMode credentialsMode) {
     return new ModuleScript(record, baseURL, nonce, parserState,
                             credentialsMode);
   }
   ~ModuleScript() = default;
 
   ScriptModule& record() { return m_record; }
   void clearRecord() { m_record = ScriptModule(); }
   const KURL& baseURL() const { return m_baseURL; }
 
+  ModuleInstantiationState instantiationState() const {
+    return m_instantiationState;
+  }
+
+  void setInstantiationSuccess();
+  void setInstantiationError(v8::Isolate*, v8::Local<v8::Value> error);
+
   ParserDisposition parserState() const { return m_parserState; }
   WebURLRequest::FetchCredentialsMode credentialsMode() const {
     return m_credentialsMode;
   }
   const String& nonce() const { return m_nonce; }
 
-  ModuleInstantiationState instantiationState() const {
-    return m_instantiationState;
-  }
-
   DECLARE_TRACE();
+  DECLARE_VIRTUAL_TRACE_WRAPPERS();
 
  private:
   ModuleScript(ScriptModule record,
                const KURL& baseURL,
                const String& nonce,
                ParserDisposition parserState,
                WebURLRequest::FetchCredentialsMode credentialsMode)
       : m_record(record),
         m_baseURL(baseURL),
+        m_instantiationError(this),

[domenic, 2017/04/05 08:26:11]

Why "this"?

[kouhei (in TOK), 2017/04/05 09:36:50]

TraceWrapperV8Reference c-tor takes m_parent as an arg.
In this case, this == ModuleScript is m_parent for the TraceWrapperV8Reference
m_instantiationError.

         m_nonce(nonce),
         m_parserState(parserState),
         m_credentialsMode(credentialsMode) {}
 
   // Note: A "module script"'s "setttings object" is ommitted, as we currently
   // always have access to the corresponding Modulator when operating on a
   // ModuleScript instance.
   // https://html.spec.whatwg.org/multipage/webappapis.html#settings-object
 
   // https://html.spec.whatwg.org/multipage/webappapis.html#concept-module-script-module-record
   ScriptModule m_record;
 
   // https://html.spec.whatwg.org/multipage/webappapis.html#concept-module-script-base-url
   const KURL m_baseURL;
 
   // https://html.spec.whatwg.org/multipage/webappapis.html#concept-module-script-instantiation-state
   ModuleInstantiationState m_instantiationState =
       ModuleInstantiationState::Uninstantiated;
 
   // https://html.spec.whatwg.org/multipage/webappapis.html#concept-module-script-instantiation-error
-  // TODO(kouhei): Add a corresponding member.
+  TraceWrapperV8Reference<v8::Value> m_instantiationError;
 
   // https://html.spec.whatwg.org/multipage/webappapis.html#concept-module-script-nonce
   const String m_nonce;
 
   // https://html.spec.whatwg.org/multipage/webappapis.html#concept-module-script-parser
   const ParserDisposition m_parserState;
 
   // https://html.spec.whatwg.org/multipage/webappapis.html#concept-module-script-credentials-mode
   const WebURLRequest::FetchCredentialsMode m_credentialsMode;
 };
 
 }  // namespace blink
 
 #endif