Compiling Ruby to Machine Language
5 days ago
- #JIT
- #Ruby
- #Compilation
- Author is working on a new edition of 'Ruby Under a Microscope' covering Ruby 3.x, including new content on YJIT and ZJIT.
- YJIT counts method and block calls to identify 'hot spots' for compilation into machine language, using thresholds like 30 for small programs and 120 for larger ones.
- YJIT blocks contain machine language instructions corresponding to YARV instructions, optimizing code execution by compiling only necessary sections.
- YJIT uses branch stubs to handle unknown types during compilation, observing actual types at runtime before finalizing machine code.
- The process involves compiling YARV instructions into machine language incrementally, with each YJIT block representing a small range of YARV instructions.
- YJIT's approach allows for optimized execution by tailoring machine language to the program's behavior without upfront type analysis.