Self‑Hosting Quickstart (Phase 15 — Resume)

This note shows how to run the Nyash self‑host compiler MVP to emit MIR(JSON v0) and execute it with the current VM line. The flow keeps defaults unchanged and uses small, opt‑in flags for development.

Layout (migrated)

Compiler entry (Stage‑B): lang/src/compiler/entry/compiler_stageb.hako
Compiler entry (compat, Stage‑A/AOT): lang/src/compiler/entry/compiler.hako
Shared helpers live under lang/src/shared/
VM/Core live under lang/src/vm/

Run the self‑host compiler

Compile a minimal program (string embedded in the compiler) and print JSON v0:

./target/release/nyash lang/src/compiler/entry/compiler_stageb.hako -- --stage3 --source 'box Main { static method main() { return 7 } }'

ENV → child args (透過):

NYASH_NY_COMPILER_MIN_JSON=1 → -- --min-json
NYASH_SELFHOST_READ_TMP=1 → -- --read-tmp (reads tmp/ny_parser_input.ny)
NYASH_NY_COMPILER_STAGE3=1 → -- --stage3 (Stage‑3 surface enable)
NYASH_NY_COMPILER_CHILD_ARGS="..." → passes extra args verbatim

Examples:

NYASH_NY_COMPILER_MIN_JSON=1 ./target/release/nyash lang/src/compiler/entry/compiler_stageb.hako -- --stage3 --source 'box Main { static method main() { return 1+2 } }' > /tmp/out.json
NYASH_SELFHOST_READ_TMP=1 ./target/release/nyash lang/src/compiler/entry/compiler_stageb.hako -- --min-json --stage3

Execute MIR(JSON v0)

Use the VM line (Rust) or PyVM harness as needed.

Rust VM (default):

./target/release/nyash --backend vm apps/examples/json_query/main.nyash

PyVM reference (when verifying parity):

NYASH_VM_USE_PY=1 ./target/release/nyash --backend vm apps/examples/json_query/main.nyash

LLVM harness (llvmlite):

NYASH_LLVM_USE_HARNESS=1 ./target/release/nyash --backend llvm apps/examples/json_query/main.nyash

Notes:

For self‑host emitted JSON, route the file to your runner pipeline or a small loader script (dev only). Keep defaults unchanged in CI (no new jobs required).

One‑shot dev smoke

Run a minimal end‑to‑end smoke that tries to emit JSON (best‑effort) and verifies VM outputs match with Known rewrite ON/OFF:

tools/selfhost_smoke.sh

It does not modify defaults and is safe to run locally.

Flags (dev)

Known rewrite default ON (userbox only, strict guards): NYASH_REWRITE_KNOWN_DEFAULT=0|1
Router trace: NYASH_ROUTER_TRACE=1
KPI sampling: NYASH_DEBUG_KPI_KNOWN=1 (+ NYASH_DEBUG_SAMPLE_EVERY=N)
Local SSA trace: NYASH_LOCAL_SSA_TRACE=1

Acceptance (P6 resume)

quick/integration remain green.
Minimal self‑host emit→execute path PASS in a dev job (no CI change).
No default behavior changes; all diagnostics under env flags.

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