README.md

Hacker's Guide to HHVM

This directory contains documentation on the internal architecture of HHVM, targeted at C++ developers looking to hack on HHVM itself.

• HHBC spec
• Frontend
  • Parser
  • Emitter
  • HHBBC
  • ...
• VM Runtime
  • Runtime data structures
    • Unit
    • Func
    • PreClass/Class
    • SrcKey
  • Execution Context
  • Bytecode interpreter
  • Unwinder
  • Treadmill
  • Debugger
  • ...
• JIT Compiler
  • Core concepts
  • Optimization passes
  • ...