[wasm] Override mechanism for wasm js APIs

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 66bd22053649b689e0d8f8333bb9b060bcb55a38..3af8bc68e216c2fa1eeca0c4a4311c4010249f03 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -6008,6 +6008,8 @@ typedef bool (*AllowWasmInstantiateCallback)(Isolate* isolate,
                                              MaybeLocal<Value> ffi,
                                              bool as_promise);
 
+typedef bool (*ExtensionCallback)(const FunctionCallbackInfo<Value>&);

[bradnelson, 2017/03/24 17:45:24]

This is pretty generic name, is the idea we'd eventually use this for more than
wasm?

[Mircea Trofin, 2017/03/24 17:57:55]

The hope is we'd delete this in favor of a "Extras" (JS) mechanism, but for now,
it's generic enough - all JS APIs receive that type of parameter.

+
 // --- Garbage Collection Callbacks ---
 
 /**
@@ -7251,6 +7253,11 @@ class V8_EXPORT Isolate {
   void SetAllowWasmCompileCallback(AllowWasmCompileCallback callback);
   void SetAllowWasmInstantiateCallback(AllowWasmInstantiateCallback callback);
 
+  void SetWasmModuleCallback(ExtensionCallback callback);
+  void SetWasmCompileCallback(ExtensionCallback callback);
+  void SetWasmInstanceCallback(ExtensionCallback callback);
+  void SetWasmInstantiateCallback(ExtensionCallback callback);
+
   /**
   * Check if V8 is dead and therefore unusable.  This is the case after
   * fatal errors such as out-of-memory situations.