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A Software Engineer, Virtual Machine & Compiler Optimization

Experience:

  • ByteDance: Python Virtual Machine, C++/Swift Compiler, Crash report and analyse systems.
  • Alibaba: Focused on improving app performance.

Projects:

  1. Python Virtual Machine:

    • JIT Compiler (ARM64): Developed a method-based JIT compiler for cpython.
    • Parallel Execution Support: Optimized cpython runtime for parallel execution using subinterpreters.
    • Micro PythonVM: Created a high-performance C++ Python VM for mobile devices.
    • AOT Compiler: Developed a high-performance AOT Compiler for Python on mobile devices.

  2. LLVM Compiler Passes for Hotfix in C++/Swift:

    • Implemented hookable indirect function dispatch in the LLVM compiler backend.

  3. Bytedance Crash Reporter System:

    • Designed and implemented crash reporting system(mach & posix) and symbolic(high concurrency service) & aggregation(distributed) systems.

  4. Taobao App Performance Enhancement:

    • Developed a binary layout optimization system for the Taobao iOS app.
    • Automated a Dark Mode system for iOS applications.

xiejunyi's Projects

addr2line icon addr2line

A cross-platform `addr2line` clone written in Rust, using `gimli`

aspects icon aspects

Delightful, simple library for aspect oriented programming.

atosl icon atosl

A partial replacement for Apple's atos tool for converting addresses within a binary file to symbols.

awesome-ios icon awesome-ios

A curated list of awesome iOS ecosystem, including Objective-C and Swift Projects

awesome-ios-resource icon awesome-ios-resource

:iphone: A curated list of awesome iOS resources, including conferences, books, blogs, articles, websites and documentations

captainhook icon captainhook

Common hooking/monkey patching headers for Objective-C on Mac OS X and iPhone OS. MIT licensed

chisel icon chisel

Chisel is a collection of LLDB commands to assist debugging iOS apps.

clrs icon clrs

:notebook:Solutions to Introduction to Algorithms

cmake icon cmake

Mirror of CMake upstream repository

cmpoptipview icon cmpoptipview

Custom UIView for iOS that pops up an animated "bubble" pointing at a button or other view. Useful for popup tips.

core icon core

The models used within the CocoaPods gem

dobby icon dobby

a lightweight, multi-platform, multi-architecture hook framework.

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