Analyzing ARC Multithreaded Assignment Crashes in iOS Applications

This article examines how ARC‑managed object assignments can produce wild pointers and EXC_BAD_ACCESS crashes in multithreaded iOS apps, explains the underlying reference‑counting steps, demonstrates reproducible demo scenarios, and offers practical mitigation strategies for developers.

ARCCrashMemory Management

0 likes · 14 min read

Analyzing ARC Multithreaded Assignment Crashes in iOS Applications

ByteDance Dali Intelligent Technology Team

Oct 27, 2021 · Fundamentals

Understanding ld64 Static Linking in iOS: Architecture, Symbol Processing, and Optimization

This article provides an in‑depth technical overview of the ld64 static linker used in iOS builds, explaining its architecture, how it parses .o, .a and .dylib files, manages symbols, atoms and fixups, resolves undefined references, performs dead‑code stripping, and generates the final executable.

LinkerStatic Linkingdead strip

0 likes · 30 min read

Understanding ld64 Static Linking in iOS: Architecture, Symbol Processing, and Optimization

ByteDance Terminal Technology

Jul 28, 2021 · Backend Development

Investigating a Clang -Oz Optimization Bug that Triggers Memory Bloat in a Video Component

The article describes how enabling the aggressive size‑optimisation flag -Oz in Clang caused a video component to create numerous GLFramebuffer and CVPixelBuffer objects, leading to OOM crashes, and explains the underlying ARC and Machine Outliner interactions that exposed a compiler bug which was later fixed in LLVM.

ClangLLVMmachine-outliner

0 likes · 11 min read

Investigating a Clang -Oz Optimization Bug that Triggers Memory Bloat in a Video Component