Prepare the bridge for C++

Reviewed By: @nicklockwood

Differential Revision: D2432291

React/Base/RCTBatchedBridge.m

@@ -18,7 +18,7 @@
 #import "RCTLog.h"
 #import "RCTModuleData.h"
 #import "RCTModuleMap.h"
-#import "RCTModuleMethod.h"
+#import "RCTBridgeMethod.h"
 #import "RCTPerformanceLogger.h"
 #import "RCTPerfStats.h"
 #import "RCTProfile.h"
@@ -767,7 +767,7 @@ - (BOOL)_handleRequestNumber:(NSUInteger)i
     return NO;
   }
 
-  RCTModuleMethod *method = moduleData.methods[methodID];
+  id<RCTBridgeMethod> method = moduleData.methods[methodID];
   if (RCT_DEBUG && !method) {
     RCTLogError(@"Unknown methodID: %zd for module: %zd (%@)", methodID, moduleID, moduleData.name);
     return NO;
@@ -783,12 +783,11 @@ - (BOOL)_handleRequestNumber:(NSUInteger)i
     }
   }
 
-  RCTProfileEndEvent(0, @"objc_call", @{
-    @"module": NSStringFromClass(method.moduleClass),
-    @"method": method.JSMethodName,
-    @"selector": NSStringFromSelector(method.selector),
-    @"args": RCTJSONStringify(RCTNullIfNil(params), NULL),
-  });
+  NSMutableDictionary *args = [method.profileArgs mutableCopy];
+  [args setValue:method.JSMethodName forKey:@"method"];
+  [args setValue:RCTJSONStringify(RCTNullIfNil(params), NULL) forKey:@"args"];
+
+  RCTProfileEndEvent(0, @"objc_call", args);
 
   return YES;
 }

React/Base/RCTBridgeMethod.h

@@ -0,0 +1,29 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+#import <Foundation/Foundation.h>
+
+@class RCTBridge;
+
+typedef NS_ENUM(NSUInteger, RCTFunctionType) {
+  RCTFunctionTypeNormal,
+  RCTFunctionTypePromise,
+};
+
+@protocol RCTBridgeMethod <NSObject>
+
+@property (nonatomic, copy, readonly) NSString *JSMethodName;
+@property (nonatomic, copy, readonly) NSDictionary *profileArgs;
+@property (nonatomic, readonly) RCTFunctionType functionType;
+
+- (void)invokeWithBridge:(RCTBridge *)bridge
+                  module:(id)module
+               arguments:(NSArray *)arguments;
+
+@end

React/Base/RCTBridgeModule.h

@@ -210,15 +210,21 @@ RCT_EXTERN void RCTRegisterModule(Class); \
 #define RCT_EXTERN_REMAP_METHOD(js_name, method) \
   + (NSArray *)RCT_CONCAT(__rct_export__, RCT_CONCAT(js_name, RCT_CONCAT(__LINE__, __COUNTER__))) { \
     return @[@#js_name, @#method]; \
-  } \
+  }
+
+/**
+ * Injects methods into JS.  Entries in this array are used in addition to any
+ * methods defined using the macros above.  This method is called only once,
+ * before registration.
+ */
+- (NSArray *)methodsToExport;
 
 /**
  * Injects constants into JS. These constants are made accessible via
- * NativeModules.ModuleName.X. This method is called when the module is
- * registered by the bridge. It is only called once for the lifetime of the
- * bridge, so it is not suitable for returning dynamic values, but may be
- * used for long-lived values such as session keys, that are regenerated only
- * as part of a reload of the entire React application.
+ * NativeModules.ModuleName.X.  It is only called once for the lifetime of the
+ * bridge, so it is not suitable for returning dynamic values, but may be used
+ * for long-lived values such as session keys, that are regenerated only as
+ * part of a reload of the entire React application.
  */
 - (NSDictionary *)constantsToExport;
 

React/Base/RCTModuleData.m

@@ -49,6 +49,11 @@ - (NSArray *)methods
 {
   if (!_methods) {
     NSMutableArray *moduleMethods = [NSMutableArray new];
+
+    if ([_instance respondsToSelector:@selector(methodsToExport)]) {
+      [moduleMethods addObjectsFromArray:[_instance methodsToExport]];
+    }
+
     unsigned int methodCount;
     Method *methods = class_copyMethodList(object_getClass(_moduleClass), &methodCount);
 
@@ -58,7 +63,7 @@ - (NSArray *)methods
       if ([NSStringFromSelector(selector) hasPrefix:@"__rct_export__"]) {
         IMP imp = method_getImplementation(method);
         NSArray *entries = ((NSArray *(*)(id, SEL))imp)(_moduleClass, selector);
-        RCTModuleMethod *moduleMethod =
+        id<RCTBridgeMethod> moduleMethod =
         [[RCTModuleMethod alloc] initWithObjCMethodName:entries[1]
                                            JSMethodName:entries[0]
                                             moduleClass:_moduleClass];
@@ -84,7 +89,7 @@ - (NSDictionary *)config
   }
 
   NSMutableDictionary *methodconfig = [NSMutableDictionary new];
-  [self.methods enumerateObjectsUsingBlock:^(RCTModuleMethod *method, NSUInteger idx, __unused BOOL *stop) {
+  [self.methods enumerateObjectsUsingBlock:^(id<RCTBridgeMethod> method, NSUInteger idx, __unused BOOL *stop) {
     methodconfig[method.JSMethodName] = @{
       @"methodID": @(idx),
       @"type": method.functionType == RCTFunctionTypePromise ? @"remoteAsync" : @"remote",

React/Base/RCTModuleMethod.h

@@ -9,12 +9,9 @@
 
 #import <Foundation/Foundation.h>
 
-@class RCTBridge;
+#import "RCTBridgeMethod.h"
 
-typedef NS_ENUM(NSUInteger, RCTFunctionType) {
-  RCTFunctionTypeNormal,
-  RCTFunctionTypePromise,
-};
+@class RCTBridge;
 
 typedef NS_ENUM(NSUInteger, RCTNullability) {
   RCTNullabilityUnspecified,
@@ -30,9 +27,8 @@ typedef NS_ENUM(NSUInteger, RCTNullability) {
 
 @end
 
-@interface RCTModuleMethod : NSObject
+@interface RCTModuleMethod : NSObject <RCTBridgeMethod>
 
-@property (nonatomic, copy, readonly) NSString *JSMethodName;
 @property (nonatomic, readonly) Class moduleClass;
 @property (nonatomic, readonly) SEL selector;
 @property (nonatomic, readonly) RCTFunctionType functionType;

React/Base/RCTModuleMethod.m

@@ -50,8 +50,11 @@ @implementation RCTModuleMethod
   NSArray *_argumentBlocks;
   NSString *_objCMethodName;
   SEL _selector;
+  NSDictionary *_profileArgs;
 }
 
+@synthesize JSMethodName = _JSMethodName;
+
 static void RCTLogArgumentError(RCTModuleMethod *method, NSUInteger index,
                                 id valueOrType, const char *issue)
 {
@@ -370,6 +373,19 @@ - (SEL)selector
   return _selector;
 }
 
+- (NSDictionary *)profileArgs
+{
+  if (_profileArgs) {
+    // This sets _selector
+    [self processMethodSignature];
+    _profileArgs = @{
+      @"module": NSStringFromClass(_moduleClass),
+      @"selector": NSStringFromSelector(_selector),
+    };
+  }
+  return _profileArgs;
+}
+
 - (void)invokeWithBridge:(RCTBridge *)bridge
                   module:(id)module
                arguments:(NSArray *)arguments