Fix crash when a test fails inside RealmReactTests

This also appears to fix crashes when running ReactTests with Chrome debugging enabled!

The crash when tests failed was due to JavaScriptCore trying to create a backtrace with the native call stack.

ReactNative/RealmReact.h

@@ -17,11 +17,10 @@
 ////////////////////////////////////////////////////////////////////////////
 
 @import Foundation;
+@import JavaScriptCore;
+
+extern JSGlobalContextRef RealmReactGetJSGlobalContextForExecutor(id executor);
 
 @interface RealmReact : NSObject
 
-@property (nonatomic, readonly) id executor;
-
-+ (id)executor;
-
 @end

ReactNative/RealmReact.m

@@ -21,7 +21,6 @@
 
 @import GCDWebServers;
 @import RealmJS;
-@import JavaScriptCore;
 @import ObjectiveC;
 @import Darwin;
 
@@ -30,11 +29,16 @@
 - (JSGlobalContextRef)ctx;
 @end
 
+JSGlobalContextRef RealmReactGetJSGlobalContextForExecutor(id executor) {
+    Ivar contextIvar = class_getInstanceVariable([executor class], "_context");
+    id rctJSContext = contextIvar ? object_getIvar(executor, contextIvar) : nil;
+
+    return [rctJSContext ctx];
+}
+
 @interface RealmReact () <RCTBridgeModule>
 @end
 
-static id s_executor;
-
 @implementation RealmReact
 
 @synthesize bridge = _bridge;
@@ -54,16 +58,12 @@ static id s_executor;
     return @"Realm";
 }
 
-+ (id)executor {
-    return s_executor;
-}
-
 - (void)setBridge:(RCTBridge *)bridge {
     _bridge = bridge;
 
     Ivar executorIvar = class_getInstanceVariable([bridge class], "_javaScriptExecutor");
-    s_executor = object_getIvar(bridge, executorIvar);
-    Ivar contextIvar = class_getInstanceVariable([s_executor class], "_context");
+    id executor = object_getIvar(bridge, executorIvar);
+    Ivar contextIvar = class_getInstanceVariable([executor class], "_context");
 
     // The executor could be a RCTWebSocketExecutor, in which case it won't have a JS context.
     if (!contextIvar) {
@@ -96,8 +96,8 @@ static id s_executor;
         return;
     }
 
-    [s_executor executeBlockOnJavaScriptQueue:^{
-        id rctJSContext = object_getIvar(s_executor, contextIvar);
+    [executor executeBlockOnJavaScriptQueue:^{
+        id rctJSContext = object_getIvar(executor, contextIvar);
         JSGlobalContextRef ctx;
 
         if (rctJSContext) {
@@ -108,7 +108,7 @@ static id s_executor;
 
             if (RCTJavaScriptContext) {
                 ctx = JSGlobalContextCreate(NULL);
-                object_setIvar(s_executor, contextIvar, [[RCTJavaScriptContext alloc] initWithJSContext:ctx]);
+                object_setIvar(executor, contextIvar, [[RCTJavaScriptContext alloc] initWithJSContext:ctx]);
             }
             else {
                 NSLog(@"Failed to load RCTJavaScriptContext class");

tests/ReactTests/ios/ReactTestsTests/RealmReactTests.m

@@ -22,13 +22,31 @@
 
 @import RealmReact;
 
+extern void JSGlobalContextSetIncludesNativeCallStackWhenReportingExceptions(JSGlobalContextRef ctx, bool includesNativeCallStack);
+
+static id<RCTJavaScriptExecutor> s_currentJavaScriptExecutor;
+
 @interface RealmReactTests : RealmJSTests
 @end
 
 @implementation RealmReactTests
 
 + (XCTestSuite *)defaultTestSuite {
-    [self waitForNotification:RCTJavaScriptDidLoadNotification];
+    NSNotification *notification = [self waitForNotification:RCTJavaScriptDidLoadNotification];
+    RCTBridge *bridge = notification.userInfo[@"bridge"];
+
+    if (!bridge) {
+        NSLog(@"No RCTBridge provided by RCTJavaScriptDidLoadNotification");
+        exit(1);
+    }
+
+    s_currentJavaScriptExecutor = [bridge valueForKey:@"javaScriptExecutor"];
+
+    // FIXME: Remove this nonsense once the crashes go away when a test fails!
+    JSGlobalContextRef ctx = RealmReactGetJSGlobalContextForExecutor(s_currentJavaScriptExecutor);
+    if (ctx) {
+        JSGlobalContextSetIncludesNativeCallStackWhenReportingExceptions(ctx, false);
+    }
 
     NSError *error;
     NSDictionary *testCaseNames = [self invokeMethod:@"getTestNames" inModule:@"index" error:&error];
@@ -47,34 +65,34 @@
     return suite;
 }
 
-+ (void)waitForNotification:(NSString *)notificationName {
++ (NSNotification *)waitForNotification:(NSString *)notificationName {
     NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
     NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
-    __block BOOL received = NO;
+    __block NSNotification *notification;
 
     id token = [nc addObserverForName:notificationName object:nil queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification *note) {
-        received = YES;
+        notification = note;
     }];
 
-    while (!received) {
+    while (!notification) {
         @autoreleasepool {
             [runLoop runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
         }
     }
 
     [nc removeObserver:token];
+    return notification;
 }
 
 + (id)invokeMethod:(NSString *)method inModule:(NSString *)module error:(NSError * __strong *)outError {
     module = [NSString stringWithFormat:@"realm-tests/%@.js", module];
 
-    id<RCTJavaScriptExecutor> executor = [RealmReact executor];
     dispatch_group_t group = dispatch_group_create();
     __block id result;
 
     dispatch_group_enter(group);
 
-    [executor executeJSCall:module method:method arguments:@[] callback:^(id json, NSError *error) {
+    [s_currentJavaScriptExecutor executeJSCall:module method:method arguments:@[] callback:^(id json, NSError *error) {
         result = json;
 
         if (error && outError) {