GC You Later, Allocator

Code and resources from my 2024 tech talk on memory.

Reference Materials

Apple and iOS

• Automatic Reference Counting, The Swift language documentation
• Reducing your app’s memory use, Apple’s doc on memory efficiency
• Preventing memory-use regressions, Apple’s doc on using XCTest for testing
• iOS Memory Deep Dive, Talk from WWDC 2018
• RefCount.h: Swift’s implementation of reference counting
• Swift 4 Weak References: Mike Ash blog post on Swift’s implementation of weak references
• LeakDetector: Steve Dao’s runtime memory leak detector for iOS

Kotlin/Native

• ObjCBackRef.hpp: Bridges a reference counted object to a garbage collected object
• SpecialRefRegistry.hpp: Root references and weak references

JVM

• 2024 Valhalla Talk: Talk from Brian Goetz on ‘Java’s Epic Refactor’
• YourKit: My favorite profiler

Sample Code

• LeakDetector.kt: Redwood's runtime leak detector
• LeakWatcher.kt: Redwood's leak tester for the JVM

Running This Sample

Android

./gradlew installDebug

iOS

Open the project in Xcode and launch it.