Steps to integrate experimented JSC

steps.md

Intro

Here are the steps to integrate experimented JavaScriptCore. Hopefully this could solve the JSC crash issue on RN 0.59.

Steps (for RN 0.59)

1. yarn add 'jsc-android@next'
2. Modify build.gradle files.

diff --git a/android/app/build.gradle b/android/app/build.gradle
index 67980c5..0bc0510 100644
--- a/android/app/build.gradle
+++ b/android/app/build.gradle
@@ -135,9 +135,16 @@ android {
             }
         }
     }
+
+    packagingOptions {
+        pickFirst '**/libjsc.so'
+    }
 }

 dependencies {
+    // Make sure to put android-jsc at the the first
+    implementation "org.webkit:android-jsc:r241213"
+
     implementation fileTree(dir: "libs", include: ["*.jar"])
     implementation "com.android.support:appcompat-v7:${rootProject.ext.supportLibVersion}"
     implementation "com.facebook.react:react-native:+"  // From node_modules
diff --git a/android/build.gradle b/android/build.gradle
index c6e7c7c..bd847fa 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -29,5 +29,9 @@ allprojects {
             // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
             url "$rootDir/../node_modules/react-native/android"
         }
+        maven {
+            // Local Maven repo containing AARs with JSC library built for Android
+            url "$rootDir/../node_modules/jsc-android/dist"
+        }
     }
 }

3. Open a terminal shell to execute.

adb logcat | grep JavaScriptCore.Version

This step is to double confirm if you pick the right JSC version. As gradle's packagingOptions.pickFirst is not reliable to pick expected library.

4. react-native run-android or gradle rebuild.

5. The previous adb logcat result should be somehow like 05-17 21:09:07.352 14710 16259 D JavaScriptCore.Version: 241213.9000.0 The version should be 241213.9000.0

6. Check if crash happens.

Feedback

Please feedbeck to me if these experimented versions fix the crash issue or not. On the other hand, the overall performance & TTI (App launch Time-To-Interact) is also meaningful to me. I want some real world feedback if there are impact to turn off JIT.

If crash still happens.

Please provide the backtrace to me.

wget https://registry.npmjs.org/jsc-android/-/jsc-android-241213.2.0.tgz
tar xf jsc-android-241213.2.0.tgz
unzip package/dist/org/webkit/android-jsc/r241213/android-jsc-r241213.aar

adb logcat -c
adb logcat | ndk-stack -sym jni/arm64-v8a/libjsc.so

Steps_for_WebkitGTK_2_24_2.md

Intro

Here are the steps to integrate experimented JavaScriptCore. Hopefully this could solve the JSC crash issue on RN 0.59.

Steps (for RN 0.59)

1. yarn add 'jsc-android@next'
2. Modify build.gradle files.

diff --git a/android/app/build.gradle b/android/app/build.gradle
index 67980c5..0bc0510 100644
--- a/android/app/build.gradle
+++ b/android/app/build.gradle
@@ -135,9 +135,16 @@ android {
             }
         }
     }
+
+    packagingOptions {
+        pickFirst '**/libjsc.so'
+    }
 }

 dependencies {
+    // Make sure to put android-jsc at the the first
+    implementation "org.webkit:android-jsc:r245459"
+
     implementation fileTree(dir: "libs", include: ["*.jar"])
     implementation "com.android.support:appcompat-v7:${rootProject.ext.supportLibVersion}"
     implementation "com.facebook.react:react-native:+"  // From node_modules
diff --git a/android/build.gradle b/android/build.gradle
index c6e7c7c..bd847fa 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -29,5 +29,9 @@ allprojects {
             // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
             url "$rootDir/../node_modules/react-native/android"
         }
+        maven {
+            // Local Maven repo containing AARs with JSC library built for Android
+            url "$rootDir/../node_modules/jsc-android/dist"
+        }
     }
 }

3. Open a terminal shell to execute.

adb logcat | grep JavaScriptCore.Version

This step is to double confirm if you pick the right JSC version. As gradle's packagingOptions.pickFirst is not reliable to pick expected library.

4. react-native run-android or gradle rebuild.

5. The previous adb logcat result should be somehow like 05-17 21:09:07.352 14710 16259 D JavaScriptCore.Version: 245459.0.0 The version should be 245459.0.0

6. Check if crash happens.

Feedback

Please feedbeck to me if these experimented versions fix the crash issue or not. On the other hand, the overall performance & TTI (App launch Time-To-Interact) is also meaningful to me. I want some real world feedback if there are impact to turn off JIT.

If crash still happens.

Please provide the backtrace to me.

wget https://registry.npmjs.org/jsc-android/-/jsc-android-245459.0.0.tgz
tar xf jsc-android-245459.0.0.tgz
unzip package/dist/org/webkit/android-jsc/r245459/android-jsc-r245459.aar

adb logcat -c
adb logcat | ndk-stack -sym jni/arm64-v8a/libjsc.so

Could not find org.webkit:android-jsc:r241213.

@Kudo thank you very much, it saves my life