Add JSCHelper function to easily install native hooks outside of JSCExecutor

Summary: JSCExecutor has something like this, but for methods on JSCExecutor itself. Open to better ideas around how to share code

Reviewed By: lexs

Differential Revision: D3516314

fbshipit-source-id: 4b1265916c52d582bb0b9348e9b4a099f566d6c9

ReactCommon/cxxreact/JSCExecutor.cpp

@@ -66,12 +66,7 @@ inline JSObjectCallAsFunctionCallback exceptionWrapMethod() {
         auto executor = static_cast<JSCExecutor*>(JSObjectGetPrivate(globalObj));
         return (executor->*method)(argumentCount, arguments);
       } catch (...) {
-        try {
+        *exception = translatePendingCppExceptionToJSError(ctx, function);
-          auto functionName = Object(ctx, function).getProperty("name").toString().str();
-          *exception = translatePendingCppExceptionToJSError(ctx, functionName.c_str());
-        } catch (...) {
-          *exception = makeJSError(ctx, "Failed to get function name while handling exception");
-        }
         return JSValueMakeUndefined(ctx);
       }
     }

ReactCommon/cxxreact/JSCHelpers.cpp

@@ -113,4 +113,13 @@ JSValueRef translatePendingCppExceptionToJSError(JSContextRef ctx, const char *e
   }
 }
 
+JSValueRef translatePendingCppExceptionToJSError(JSContextRef ctx, JSObjectRef jsFunctionCause) {
+  try {
+    auto functionName = Object(ctx, jsFunctionCause).getProperty("name").toString().str();
+    return translatePendingCppExceptionToJSError(ctx, functionName.c_str());
+  } catch (...) {
+    return makeJSError(ctx, "Failed to get function name while handling exception");
+  }
+}
+
 } }

ReactCommon/cxxreact/JSCHelpers.h

@@ -52,5 +52,33 @@ JSValueRef evaluateScript(
 JSValueRef makeJSError(JSContextRef ctx, const char *error);
 
 JSValueRef translatePendingCppExceptionToJSError(JSContextRef ctx, const char *exceptionLocation);
+JSValueRef translatePendingCppExceptionToJSError(JSContextRef ctx, JSObjectRef jsFunctionCause);
+
+template<JSValueRef (method)(JSContextRef ctx,
+        JSObjectRef function,
+        JSObjectRef thisObject,
+        size_t argumentCount,
+        const JSValueRef arguments[],
+        JSValueRef *exception)>
+inline JSObjectCallAsFunctionCallback exceptionWrapMethod() {
+  struct funcWrapper {
+    static JSValueRef call(
+        JSContextRef ctx,
+        JSObjectRef function,
+        JSObjectRef thisObject,
+        size_t argumentCount,
+        const JSValueRef arguments[],
+        JSValueRef *exception) {
+      try {
+        return (*method)(ctx, function, thisObject, argumentCount, arguments, exception);
+      } catch (...) {
+        *exception = translatePendingCppExceptionToJSError(ctx, function);
+        return JSValueMakeUndefined(ctx);
+      }
+    }
+  };
+
+  return &funcWrapper::call;
+}
 
 } }