GScript

A scripting language with Go syntax and Lua semantics, featuring a register-based bytecode VM and ARM64 Method JIT compiler.

Quick start

go build -o gscript ./cmd/gscript/
./gscript examples/fib.gs          # tree-walker
./gscript --vm examples/fib.gs     # bytecode VM
./gscript --jit examples/fib.gs    # ARM64 JIT (Apple Silicon)
./gscript -e 'print("hello")'      # eval
./gscript                          # REPL

Architecture

Three-tier execution: interpreter → Tier 1 baseline JIT → Tier 2 optimizing JIT.

• Tier 1 — V8 Sparkplug-style 1:1 bytecode→ARM64 templates. Native BLR calls, inline field cache, GETGLOBAL value cache, NaN-boxing.
• Tier 2 — SSA IR pipeline: BuildGraph → TypeSpec → Intrinsic → Inline → ConstProp → LoadElim → DCE → RangeAnalysis → LICM → RegAlloc → ARM64.

Benchmarks

python3 benchmarks/timing_compare.py --all-groups --runs=5 --warmup=1 \
  --time-source=auto --sort=luajit-gap

Testing

go test ./internal/methodjit/ -short -count=1 -timeout 120s
go test ./internal/vm/ -short -count=1 -timeout 120s

License

MIT