[ESNext] Implement DynamicImportCall

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 2f3c77600745b4b20482617f32995d3b20569557..6dbc8671f57cbc4a1c3594aa0db5da50a25ee5f6 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -1070,6 +1070,19 @@ class V8_EXPORT Module {
    * Returns the completion value.
    */
   V8_WARN_UNUSED_RESULT MaybeLocal<Value> Evaluate(Local<Context> context);
+
+  /**
+   * Resolves the promise with the namespace object of the given
+   * module.
+   */
+  static V8_WARN_UNUSED_RESULT bool FinishDynamicImportSuccess(
+      Local<Context> context, Local<Promise> promise, Local<Module> module);
+
+  /**
+   * Rejects the promise with the given exception.
+   */
+  static V8_WARN_UNUSED_RESULT bool FinishDynamicImportFailure(
+      Local<Context> context, Local<Promise> promise, Local<Value> exception);
 };
 
 /**
@@ -5789,6 +5802,11 @@ typedef void (*BeforeCallEnteredCallback)(Isolate*);
 typedef void (*CallCompletedCallback)(Isolate*);
 typedef void (*DeprecatedCallCompletedCallback)();
 
+typedef void (*HostImportModuleDynamicallyCallback)(Isolate* isolate,
+                                                    Local<String> referrer,
+                                                    Local<String> specifier,
+                                                    Local<Promise> promise);

[gsathya, 2017/03/22 03:08:34]

Jochen --

The embedder should not tamper with the promise passed to it. Do you think we
should create a new BlackBox type for this promise, so the embedder can't do
anything? Or use Value (they can still do IsPromise(), though)? Or just leave it
as such?

I have a helpful comment FWIW :p

+
 /**
  * PromiseHook with type kInit is called when a new promise is
  * created. When a new promise is created as part of the chain in the
@@ -6342,7 +6360,8 @@ class V8_EXPORT Isolate {
           add_histogram_sample_callback(nullptr),
           array_buffer_allocator(nullptr),
           external_references(nullptr),
-          allow_atomics_wait(true) {}
+          allow_atomics_wait(true),
+          host_import_module_dynamically_callback_(nullptr) {}
 
     /**
      * The optional entry_hook allows the host application to provide the
@@ -6405,6 +6424,16 @@ class V8_EXPORT Isolate {
      * this isolate.
      */
     bool allow_atomics_wait;
+
+    /**
+     * This is an unfinished experimental feature, and is only exposed
+     * here for internal testing purposes. DO NOT USE.
+     *
+     * This specifies the callback called by the upcoming dynamic
+     * import() language feature to load modules.
+     */
+    HostImportModuleDynamicallyCallback
+        host_import_module_dynamically_callback_;
   };