Some Assembly Required
summary
Builds a pure Ruby JIT called TenderJIT that actually emits x86 machine bytes with an assembler library fisk, writes them into executable memory and calls them, and patches Ruby internals using fiddle and odinflex to install a jit_func. Shows a working pipeline that turns YARV instruction sequences into machine code, records a benchmark (interpreted ~10s vs jitted ~4s) and demos setting a jit to return 42, proving the approach works end to end.
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chapters (15)
- 0:00Start
- 6:04Fibonacci Benchmark
- 8:40Generate Machine Code
- 9:39ERB Template
- 11:41Stack Machine
- 14:20Register Machine
- 15:29x86 Instructions
- 20:29Access Instruction From Ruby
- 20:56Mini YARV
- 22:52Integrate Virtual Stack
- 24:03Execution Example
- 24:46Refactor To a Method
- 26:45Update Virtual Stack
- 29:17CFP: Control Frame Pointer One per stack frame
- 29:45ISeq: Instruction Sequence One per "executable code"
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