4/n Display a RedBox with the JS stack (instead of native stack) when an unhandled JS exceptions occurs - Try 2

Summary:
Changelog: [iOS][Changed] Display a RedBox with the JS stack (instead of native stack) when an unhandled JS exceptions occurs

-----

# A0) Bridge mode, Unhandled Exception, FBiOS
Unhandled exception goes to FBReactModule, but the JS Stack is not parsed correctly.
https://www.internalfb.com/code/fbsource/[312d5cbdd7278247a84619786b12a44c4400fcc0]/fbobjc/Apps/Wilde/FBReactModule2/FBReactModuleAPI/FBReactModuleAPI/Exported/FBReactModule.mm?lines=1488%2C1493

See `****** FBReactModule handleFatalError` in the logs P539306390, and compare with correct behavior in (A1) in the Test Plan.

https://pxl.cl/2h6h3

{F782257996}

-----

# A) Before diff, rn-tester
Open to rn-tester -> APIs -> Crash Examples -> JS Crash.

Set `RCTParseUnhandledJSErrorStackNatively` to YES.
https://www.internalfb.com/code/fbsource/[98880e52ee78be3614e5d9a2ce3292f6a7b5e413]/xplat/js/react-native-github/React/Base/RCTConstants.m?lines=73

{F783395297}

----

build_on_commit[ios_fbios-arm64-dylibs-jackalope-iphoneos-production_build]

Reviewed By: RSNara

Differential Revision: D40613108

fbshipit-source-id: f36c3b39a2167402ee3730db8b40b53a0b80aa60

Author: p-sun

BUCK

@@ -197,6 +197,7 @@ rn_xplat_cxx_library2(
     visibility = ["PUBLIC"],
     deps = [
         "//xplat/folly:dynamic",
+        react_native_xplat_target("jserrorhandler:jserrorhandler"),
     ],
 )
 

React/CxxBridge/RCTCxxBridge.mm

@@ -1137,10 +1137,7 @@ - (void)handleError:(NSError *)error
   // In state 3: do nothing.
 
   if (self->_valid && !self->_loading) {
-    if ([error userInfo][RCTJSRawStackTraceKey]) {
-      [self.redBox showErrorMessage:[error localizedDescription] withRawStack:[error userInfo][RCTJSRawStackTraceKey]];
-    }
-
+    [self showJsError:error onRedBox:self.redBox];
     RCTFatal(error);
 
     // RN will stop, but let the rest of the app keep going.
@@ -1171,15 +1168,20 @@ - (void)handleError:(NSError *)error
     [[NSNotificationCenter defaultCenter] postNotificationName:RCTJavaScriptDidFailToLoadNotification
                                                         object:self->_parentBridge
                                                       userInfo:@{@"bridge" : self, @"error" : error}];
-
-    if ([error userInfo][RCTJSRawStackTraceKey]) {
-      [redBox showErrorMessage:[error localizedDescription] withRawStack:[error userInfo][RCTJSRawStackTraceKey]];
-    }
-
+    [self showJsError:error onRedBox:redBox];
     RCTFatal(error);
   });
 }
 
+- (void)showJsError:(NSError *)error onRedBox:(RCTRedBox *)redbox
+{
+  if ([error userInfo][RCTJSStackTraceKey]) {
+    [redbox showErrorMessage:[error localizedDescription] withStack:[error userInfo][RCTJSStackTraceKey]];
+  } else if ([error userInfo][RCTJSRawStackTraceKey]) {
+    [redbox showErrorMessage:[error localizedDescription] withRawStack:[error userInfo][RCTJSRawStackTraceKey]];
+  }
+}
+
 RCT_NOT_IMPLEMENTED(-(instancetype)initWithDelegate
                     : (__unused id<RCTBridgeDelegate>)delegate bundleURL
                     : (__unused NSURL *)bundleURL moduleProvider

React/CxxModule/RCTCxxUtils.mm

@@ -7,6 +7,9 @@
 
 #import "RCTCxxUtils.h"
 
+#include <jserrorhandler/JsErrorHandler.h>
+
+#import <React/RCTConstants.h>
 #import <React/RCTFollyConvert.h>
 #import <React/RCTModuleData.h>
 #import <React/RCTUtils.h>
@@ -20,8 +23,6 @@
 namespace facebook {
 namespace react {
 
-using facebook::jsi::JSError;
-
 std::vector<std::unique_ptr<NativeModule>>
 createNativeModules(NSArray<RCTModuleData *> *modules, RCTBridge *bridge, const std::shared_ptr<Instance> &instance)
 {
@@ -42,13 +43,34 @@
 
 static NSError *errorWithException(const std::exception &e)
 {
-  NSString *msg = @(e.what());
+  NSString *msg;
   NSMutableDictionary *errorInfo = [NSMutableDictionary dictionary];
 
-  const auto *jsError = dynamic_cast<const JSError *>(&e);
-  if (jsError) {
-    errorInfo[RCTJSRawStackTraceKey] = @(jsError->getStack().c_str());
-    msg = [@"Unhandled JS Exception: " stringByAppendingString:msg];
+  const auto *jsError = dynamic_cast<const jsi::JSError *>(&e);
+  if (jsError && RCTGetParseUnhandledJSErrorStackNatively()) {
+    MapBuffer errorMap = JsErrorHandler::parseErrorStack(*jsError, true, false);
+
+    NSString *message = [NSString stringWithCString:errorMap.getString(JSErrorHandlerKey::kErrorMessage).c_str()
+                                           encoding:[NSString defaultCStringEncoding]];
+    auto frames = errorMap.getMapBufferList(JSErrorHandlerKey::kAllStackFrames);
+    NSMutableArray *stack = [[NSMutableArray alloc] init];
+    for (auto const &mapBuffer : frames) {
+      NSDictionary *frame = @{
+        @"file" : [NSString stringWithCString:mapBuffer.getString(JSErrorHandlerKey::kFrameFileName).c_str()
+                                     encoding:[NSString defaultCStringEncoding]],
+        @"methodName" : [NSString stringWithCString:mapBuffer.getString(JSErrorHandlerKey::kFrameMethodName).c_str()
+                                           encoding:[NSString defaultCStringEncoding]],
+        @"lineNumber" : [NSNumber numberWithInt:mapBuffer.getInt(JSErrorHandlerKey::kFrameLineNumber)],
+        @"column" : [NSNumber numberWithInt:mapBuffer.getInt(JSErrorHandlerKey::kFrameColumnNumber)],
+      };
+      [stack addObject:frame];
+    }
+
+    msg = [@"Unhandled JS Exception: " stringByAppendingString:message];
+    errorInfo[RCTJSStackTraceKey] = stack;
+    errorInfo[RCTJSRawStackTraceKey] = @(e.what());
+  } else {
+    msg = @(e.what());
   }
 
   NSError *nestedError;

ReactCommon/React-Fabric.podspec

@@ -254,8 +254,6 @@ Pod::Spec.new do |s|
   end
 
   s.subspec "mapbuffer" do |ss|
-    ss.dependency             folly_dep_name, folly_version
-    ss.compiler_flags       = folly_compiler_flags
     ss.source_files         = "react/renderer/mapbuffer/**/*.{m,mm,cpp,h}"
     ss.exclude_files        = "react/renderer/mapbuffer/tests"
     ss.header_dir           = "react/renderer/mapbuffer"

ReactCommon/jserrorhandler/BUCK

@@ -4,8 +4,8 @@ load("//tools/build_defs/oss:rn_defs.bzl", "ANDROID", "APPLE", "CXX", "react_nat
 rn_xplat_cxx_library(
     name = "jserrorhandler",
     srcs = glob(["*.cpp"]),
-    header_namespace = "",
-    exported_headers = {"JsErrorHandler/JsErrorHandler.h": "JsErrorHandler.h"},
+    header_namespace = "jserrorhandler",
+    exported_headers = ["JsErrorHandler.h"],
     compiler_flags = [
         "-fexceptions",
         "-frtti",
@@ -22,8 +22,6 @@ rn_xplat_cxx_library(
         "PUBLIC",
     ],
     deps = [
-        "//xplat/folly:dynamic",
-        "//xplat/folly:json",
         "//xplat/jsi:jsi",
         react_native_xplat_target("react/renderer/mapbuffer:mapbuffer"),
     ],

ReactCommon/jserrorhandler/JsErrorHandler.cpp

@@ -17,8 +17,10 @@ namespace react {
 
 using facebook::react::JSErrorHandlerKey;
 
-static MapBuffer
-parseErrorStack(const jsi::JSError &error, bool isFatal, bool isHermes) {
+MapBuffer JsErrorHandler::parseErrorStack(
+    const jsi::JSError &error,
+    bool isFatal,
+    bool isHermes) {
   /**
    * This parses the different stack traces and puts them into one format
    * This borrows heavily from TraceKit (https://github.com/occ/TraceKit)
@@ -99,7 +101,7 @@ JsErrorHandler::~JsErrorHandler() {}
 void JsErrorHandler::handleJsError(const jsi::JSError &error, bool isFatal) {
   // TODO: Current error parsing works and is stable. Can investigate using
   // REGEX_HERMES to get additional Hermes data, though it requires JS setup.
-  MapBuffer errorMap = parseErrorStack(error, isFatal, false);
+  MapBuffer errorMap = JsErrorHandler::parseErrorStack(error, isFatal, false);
   _jsErrorHandlingFunc(std::move(errorMap));
 }
 

ReactCommon/jserrorhandler/JsErrorHandler.h

@@ -26,6 +26,9 @@ class JsErrorHandler {
  public:
   using JsErrorHandlingFunc = std::function<void(MapBuffer errorMap)>;
 
+  static MapBuffer
+  parseErrorStack(const jsi::JSError &error, bool isFatal, bool isHermes);
+
   JsErrorHandler(JsErrorHandlingFunc jsErrorHandlingFunc);
   ~JsErrorHandler();
 

ReactCommon/jserrorhandler/React-jserrorhandler.podspec

@@ -0,0 +1,36 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+require "json"
+
+package = JSON.parse(File.read(File.join(__dir__, "..", "..", "package.json")))
+version = package['version']
+
+source = { :git => 'https://github.com/facebook/react-native.git' }
+if version == '1000.0.0'
+  # This is an unpublished version, use the latest commit hash of the react-native repo, which we’re presumably in.
+  source[:commit] = `git rev-parse HEAD`.strip if system("git rev-parse --git-dir > /dev/null 2>&1")
+else
+  source[:tag] = "v#{version}"
+end
+
+Pod::Spec.new do |s|
+  s.name                   = "React-jserrorhandler"
+  s.version                = version
+  s.summary                = "-"  # TODO
+  s.homepage               = "https://reactnative.dev/"
+  s.license                = package["license"]
+  s.author                 = "Facebook, Inc. and its affiliates"
+  s.platforms              = { :ios => "12.4", :tvos => "12.4" }
+  s.public_header_files    = [ "JsErrorHandler.h" ]
+  s.source                 = source
+  s.source_files           = "*.{cpp,h}"
+  s.pod_target_xcconfig    = { "HEADER_SEARCH_PATHS" => "" }
+  s.header_dir             = "jserrorhandler"
+
+  s.dependency "React-jsi", version
+  s.dependency "React-Fabric/mapbuffer", version
+
+end

packages/rn-tester/Podfile.lock

@@ -620,6 +620,9 @@ PODS:
     - React-jsiexecutor (= 1000.0.0)
     - React-jsinspector (= 1000.0.0)
     - React-perflogger (= 1000.0.0)
+  - React-jserrorhandler (1000.0.0):
+    - React-Fabric/mapbuffer (= 1000.0.0)
+    - React-jsi (= 1000.0.0)
   - React-jsi (1000.0.0):
     - hermes-engine
   - React-jsidynamic (1000.0.0):
@@ -796,6 +799,7 @@ DEPENDENCIES:
   - React-Fabric (from `../../ReactCommon`)
   - React-graphics (from `../../ReactCommon/react/renderer/graphics`)
   - React-hermes (from `../../ReactCommon/hermes`)
+  - React-jserrorhandler (from `../../ReactCommon/jserrorhandler`)
   - React-jsi (from `../../ReactCommon/jsi`)
   - React-jsidynamic (from `../../ReactCommon/jsi`)
   - React-jsiexecutor (from `../../ReactCommon/jsiexecutor`)
@@ -879,6 +883,8 @@ EXTERNAL SOURCES:
     :path: "../../ReactCommon/react/renderer/graphics"
   React-hermes:
     :path: "../../ReactCommon/hermes"
+  React-jserrorhandler:
+    :path: "../../ReactCommon/jserrorhandler"
   React-jsi:
     :path: "../../ReactCommon/jsi"
   React-jsidynamic:
@@ -958,9 +964,10 @@ SPEC CHECKSUMS:
   React-Core: 3965263aa4b4e1ebf7b4fdb50d2f49ce7bf28f63
   React-CoreModules: 675170bccf156da3a3348e04e2036ce401b2010d
   React-cxxreact: 7276467c246302fedf598cc40d7003896ddb20ba
-  React-Fabric: 141459e61c825acf02d26ece099acbd9cbd87b99
+  React-Fabric: e177589b59ae3ae3dd3340190adcde9cf01ebceb
   React-graphics: 5ccc9cc0d91794fd42bc1c693e9aea207554bbef
   React-hermes: 0a5145bae4207edf0def8e28fbcb6a8fd6e806c2
+  React-jserrorhandler: f0e756378ad46f5f3448f097a736eb5249de262b
   React-jsi: c24dbcfdf7ea075138b73372387c7f17c0db56ef
   React-jsidynamic: 2b14ac1b6d3a1b7daa1e5a424b98de87da981698
   React-jsiexecutor: 14e899380e3fe9ca74c4e19727540a03e7574721

scripts/react_native_pods.rb

@@ -101,6 +101,8 @@ def use_react_native! (
   else
     setup_jsc!(:react_native_path => prefix, :fabric_enabled => fabric_enabled)
   end
+  pod 'React-jserrorhandler', :path => "#{prefix}/ReactCommon/jserrorhandler"
+
   pod 'React-jsidynamic', :path => "#{prefix}/ReactCommon/jsi"
   pod 'React-jsiexecutor', :path => "#{prefix}/ReactCommon/jsiexecutor"
   pod 'React-jsinspector', :path => "#{prefix}/ReactCommon/jsinspector"