Add shen-swift as a Ratatoskr stage-2 target (Swift) - #7
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shen-swift is a tree-walking KLambda interpreter (iOS-capable), not a
compiler, so its stage-2 builder has nothing to code-generate: the
artifact IS the shaken slice, executed by the shen-swift binary — the
same runtime-reference relationship the lua/julia targets have. The win
is boot speed: a ~200-line shaken kernel vs the full ~2500-line kernel.
builders/swift/build.sh copies the shaken kernel.kl + user .kl next to a
`run` launcher that drives shen-swift in `--shaken` mode (a new flag on
the shen-swift side: boot the slice — defuns, native overrides,
(shen.initialise), then top-level forms — and run the program to
completion, no full kernel, no launcher). Load order mirrors the
Scheme/Lua builders.
Wired: builders.json `swift` entry; `{shen_swift}` subst + swift→shen-swift
sibling map in both the Go CLI (main.go) and the Python oracle
(ratatoskr_cli.py). Verified `fib 20 = 6765` via `ratatoskr run --target
swift` and byte-identical with shen-lua under `bifrost --shake`. With
this, all eight bifrost ports have a builder.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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shen-swift is a tree-walking KLambda interpreter (iOS-capable), not a compiler — so its stage-2 builder has nothing to code-generate. The artifact is the shaken slice, executed by the shen-swift binary, the same runtime-reference relationship the
lua/juliatargets have to their toolchains. The win is boot speed: a ~200-line shaken kernel vs the full ~2500-line kernel.What's here
builders/swift/build.sh— reads the user.klfrom the manifest, copieskernel.kl+user.klnext to arunlauncher that drives shen-swift in--shakenmode (a new flag on the shen-swift side). Resolves/builds the shen-swift binary (SHEN_SWIFT/SHEN_SWIFT_BINoverridable).builders.json—swiftentry (run_impl: shen-swift,needs: ["swift"]).main.go+ratatoskr_cli.py—{shen_swift}substitution andswift → shen-swiftsibling map in both the Go CLI and the Python oracle.Load order
Mirrors the Scheme/Lua builders: load all defuns → install native overrides →
(shen.initialise)→ run the collected top-level forms (kernel, then user) so the program runs against a fully initialised environment.Verification
ratatoskr run --target swift tests/fib.shen out/→fib 20 = 6765.bifrost --shake --only recursion-fib-file --impls shen-swift,shen-lua→ both PASS, byte-identical.go vet/go test(4 passed) /pytest test_portable.py(7 passed) green.With this, all eight bifrost ports have a Ratatoskr builder.
🤖 Generated with Claude Code