Implement RCTJSCWrapper

Reviewed By: tadeuzagallo

Differential Revision: D3258713

fbshipit-source-id: 418eb9d350bf3541c976b631bd9799a1c578f5e5

React/Base/RCTPerformanceLogger.h

@@ -24,6 +24,8 @@ typedef NS_ENUM(NSUInteger, RCTPLTag) {
   RCTPLNativeModulePrepareConfig,
   RCTPLNativeModuleInjectConfig,
   RCTPLNativeModuleMainThreadUsesCount,
+  RCTPLJSCWrapperOpenLibrary,
+  RCTPLJSCWrapperLoadFunctions,
   RCTPLJSCExecutorSetup,
   RCTPLBridgeStartup,
   RCTPLTTI,

React/Base/RCTPerformanceLogger.m

@@ -97,6 +97,8 @@ void RCTPerformanceLoggerAppendEnd(RCTPLTag tag)
       @"NativeModulePrepareConfig",
       @"NativeModuleInjectConfig",
       @"NativeModuleMainThreadUsesCount",
+      @"JSCWrapperOpenLibrary",
+      @"JSCWrapperLoadFunctions",
       @"JSCExecutorSetup",
       @"BridgeStartup",
       @"RootViewTTI",

React/Executors/RCTJSCExecutor.h

@@ -25,17 +25,31 @@ RCT_EXTERN NSString *const RCTJSCThreadName;
  */
 RCT_EXTERN NSString *const RCTJavaScriptContextCreatedNotification;
 
+/**
+ * Uses a JavaScriptCore context as the execution engine.
+ */
+@interface RCTJSCExecutor : NSObject <RCTJavaScriptExecutor>
+
+/**
+ * Sets a type of JSC library (system or custom) that's used
+ * to initialize RCTJSCWrapper.
+ * @default is NO.
+ */
++ (void)setUseCustomJSCLibrary:(BOOL)useCustomLibrary;
+
+/**
+ * Gets a type of JSC library (system or custom) that's used
+ * to initialize RCTJSCWrapper.
+ * @default is NO.
+ */
++ (BOOL)useCustomJSCLibrary;
+
 /**
  * Create a NSError from a JSError object.
  *
  * If available, the error's userInfo property will contain the JS stacktrace under
  * the RCTJSStackTraceKey key.
  */
-RCT_EXTERN NSError *RCTNSErrorFromJSError(JSContextRef context, JSValueRef jsError);
-
-/**
- * Uses a JavaScriptCore context as the execution engine.
- */
-@interface RCTJSCExecutor : NSObject <RCTJavaScriptExecutor>
+- (NSError *)convertJSErrorToNSError:(JSValueRef)jsError context:(JSContextRef)context;
 
 @end