From 0ffb2d36ebfa6fded818847738e8eb0e184dcaf5 Mon Sep 17 00:00:00 2001
From: Tadeu Zagallo <tadeuzagallo@fb.com>
Date: Tue, 7 Jul 2015 18:23:58 -0700
Subject: [PATCH] [ReactNative] Fix crash when reload during profile

Summary:
Fixes #1642

When reloading during profiling, the profile wouldn't unhook from the instance
being deallocated.
---
 React/Base/RCTBatchedBridge.m | 12 ++++++++++++
 React/Base/RCTProfile.h       | 13 +++++++++++++
 React/Base/RCTProfile.m       |  8 +++++---
 React/Views/RCTNavigator.m    |  2 +-
 4 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/React/Base/RCTBatchedBridge.m b/React/Base/RCTBatchedBridge.m
index 9b77ad46604106..569c7f7791d96d 100644
--- a/React/Base/RCTBatchedBridge.m
+++ b/React/Base/RCTBatchedBridge.m
@@ -106,6 +106,13 @@ - (instancetype)initWithParentBridge:(RCTBridge *)bridge
      */
     [self registerModules];
 
+    /**
+     * If currently profiling, hook into the current instance
+     */
+    if (RCTProfileIsProfiling()) {
+      RCTProfileHookModules(self);
+    }
+
     /**
      * Start the application script
      */
@@ -364,8 +371,13 @@ - (void)invalidate
     }
     moduleData.queue = nil;
   }
+
   dispatch_group_notify(group, dispatch_get_main_queue(), ^{
     [_javaScriptExecutor executeBlockOnJavaScriptQueue:^{
+      if (RCTProfileIsProfiling()) {
+        RCTProfileUnhookModules(self);
+      }
+
       [_jsDisplayLink invalidate];
       _jsDisplayLink = nil;
 
diff --git a/React/Base/RCTProfile.h b/React/Base/RCTProfile.h
index 469a8155291b45..66cf40bf4425a5 100644
--- a/React/Base/RCTProfile.h
+++ b/React/Base/RCTProfile.h
@@ -103,6 +103,16 @@ RCT_EXTERN void RCTProfileImmediateEvent(NSString *, NSTimeInterval , NSString *
   RCTProfileEndEvent([NSString stringWithFormat:@"[%@ %@]", NSStringFromClass([self class]), NSStringFromSelector(_cmd)], category, arguments); \
 }
 
+/**
+ * Hook into a bridge instance to log all bridge module's method calls
+ */
+RCT_EXTERN void RCTProfileHookModules(RCTBridge *);
+
+/**
+ * Unhook from a given bridge instance's modules
+ */
+RCT_EXTERN void RCTProfileUnhookModules(RCTBridge *);
+
 #else
 
 #define RCTProfileBeginFlowEvent()
@@ -125,4 +135,7 @@ RCT_EXTERN void RCTProfileImmediateEvent(NSString *, NSTimeInterval , NSString *
 
 #define RCTProfileBlock(block, ...) block
 
+#define RCTProfileHookModules(...)
+#define RCTProfileUnhookModules(...)
+
 #endif
diff --git a/React/Base/RCTProfile.m b/React/Base/RCTProfile.m
index 62a17fe7b00d00..4eeaf3e9d95d25 100644
--- a/React/Base/RCTProfile.m
+++ b/React/Base/RCTProfile.m
@@ -144,14 +144,17 @@ static IMP RCTProfileMsgForward(NSObject *self, SEL selector)
   return imp;
 }
 
-static void RCTProfileHookModules(RCTBridge *);
-static void RCTProfileHookModules(RCTBridge *bridge)
+void RCTProfileHookModules(RCTBridge *bridge)
 {
   for (RCTModuleData *moduleData in [bridge valueForKey:@"_modules"]) {
     [moduleData dispatchBlock:^{
       Class moduleClass = moduleData.cls;
       Class proxyClass = objc_allocateClassPair(moduleClass, RCTProfileProxyClassName(moduleClass), 0);
 
+      if (!proxyClass) {
+        return;
+      }
+
       unsigned int methodCount;
       Method *methods = class_copyMethodList(moduleClass, &methodCount);
       for (NSUInteger i = 0; i < methodCount; i++) {
@@ -185,7 +188,6 @@ static void RCTProfileHookModules(RCTBridge *bridge)
   }
 }
 
-void RCTProfileUnhookModules(RCTBridge *);
 void RCTProfileUnhookModules(RCTBridge *bridge)
 {
   for (RCTModuleData *moduleData in [bridge valueForKey:@"_modules"]) {
diff --git a/React/Views/RCTNavigator.m b/React/Views/RCTNavigator.m
index 63e3d8023462f7..ff91b0b5474c9f 100644
--- a/React/Views/RCTNavigator.m
+++ b/React/Views/RCTNavigator.m
@@ -436,7 +436,7 @@ - (void)dispatchFakeScrollEvent
  */
 - (UIView *)reactSuperview
 {
-  RCTAssert(self.superview != nil, @"put reactNavSuperviewLink back");
+  RCTAssert(!_bridge.isValid || self.superview != nil, @"put reactNavSuperviewLink back");
   return self.superview ? self.superview : self.reactNavSuperviewLink;
 }