VM spec in SX + 72 tests passing on both JS and OCaml
spec/vm.sx — bytecode VM written in SX (the spec):
- Stack-based interpreter for bytecode from compiler.sx
- 24 opcodes: constants, variables (local/upvalue/global), control flow,
function calls (with TCO), closures with upvalue capture, collections,
string concat, define
- Upvalue cells for shared mutable closure variables
- Call dispatch: vm-closure (fast path), native-fn, CEK fallback
- Platform interface: 7 primitives (vm-stack-*, call-primitive, cek-call,
get-primitive, env-parent)
spec/tests/test-vm.sx — 72 tests exercising compile→bytecode→VM pipeline:
constants, arithmetic, comparison, control flow (if/when/cond/case/and/or),
let bindings, lambda, closures, upvalue mutation, TCO (10K iterations),
collections, strings, define, letrec, quasiquote, threading, integration
(fibonacci, recursive map/filter/reduce, compose)
spec/compiler.sx — fix :else keyword detection in case/cond compilation
(was comparing Keyword object to evaluated string, now checks type)
Platform primitives added (JS + OCaml):
make-vm-stack, vm-stack-get, vm-stack-set!, vm-stack-length, vm-stack-copy!,
primitive?, get-primitive, call-primitive, set-nth! (JS)
Test runners updated to load bytecode.sx + compiler.sx + vm.sx for --full.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
giles
23c8b97cb1