shake: add the swift target (shen-swift)

README.md

@@ -151,16 +151,18 @@ python3 bifrost.py --shake --impls shen-lua,ShenScript # just the fast ones
 
 Artifacts map onto their impl column (lisp→`shen-cl`, lua→`shen-lua`,
 go→`shen-go`, rust→`shen-rust`, js→`ShenScript`, julia→`shen-julia`,
-scheme→`shen-scheme`); `shen-swift` has no Ratatoskr builder yet and shows
-`----`. Needs the per-target toolchains
-(`sbcl`/`luajit`/`go`/`cargo`/`node`/`julia`/`chez`) and
+scheme→`shen-scheme`, swift→`shen-swift`) — all eight ports now have a
+Ratatoskr builder. Needs the per-target toolchains
+(`sbcl`/`luajit`/`go`/`cargo`/`node`/`julia`/`chez`/`swift`) and
 `$BIFROST_RATATOSKR_DIR` (default `../ratatoskr`); missing toolchains are
 skipped, not failed. This mode is minutes, not seconds: go/rust compile from
 scratch, and the **julia** target AOT-bakes a per-program sysimage
 (PackageCompiler, ~250MB, several minutes) — the deploy artifact for
 Shen-on-Julia, analogous to the Lisp saved image. The **scheme** target
 compiles the shaken slice with shen-scheme's own `kl->scheme` into a
-self-contained Chez program.
+self-contained Chez program; the **swift** target drives the shen-swift
+tree-walking interpreter on the shaken slice in `--shaken` mode (booting a
+~200-line kernel instead of the full ~2500-line kernel).
 
 `--shake` drives the **Go `ratatoskr` binary** (resolved on `$PATH`, else
 `$RATATOSKR_BIN`, else `$BIFROST_RATATOSKR_DIR` / a sibling `../ratatoskr`); no

bifrost.py

@@ -857,8 +857,8 @@ def run_ratatoskr_parity(case, available):
 # --------------------------------------------------------------------------
 
 # Each Ratatoskr build target maps onto the impl column it runs on, so shake
-# results line up with the normal matrix. shen-swift has no Ratatoskr builder
-# yet, so it stays absent and shows SKIP in its column.
+# results line up with the normal matrix. All eight bifrost ports now have a
+# Ratatoskr builder.
 #
 # The `julia` target is special: shen-julia's stand-alone artifact is produced
 # by AOT-compiling the shaken kernel+user KL into baked Julia methods and (per
@@ -867,9 +867,11 @@ def run_ratatoskr_parity(case, available):
 # minutes and ~250MB, so it only runs under --shake (already opt-in/heavy).
 # The `scheme` target compiles the shaken slice with shen-scheme's own
 # kl->scheme into a self-contained Chez artifact (run via `chez --script`).
+# The `swift` target drives the shen-swift tree-walking interpreter on the
+# shaken slice (boot a ~200-line kernel instead of the full ~2500-line kernel).
 TARGET_TO_IMPL = {"lisp": "shen-cl", "lua": "shen-lua", "go": "shen-go",
                   "rust": "shen-rust", "js": "ShenScript", "julia": "shen-julia",
-                  "scheme": "shen-scheme"}
+                  "scheme": "shen-scheme", "swift": "shen-swift"}
 
 
 def _import_ratatoskr_cli():

shake.go

@@ -15,19 +15,21 @@ import (
 )
 
 // Each Ratatoskr build target maps onto the impl column it runs on, so shake
-// results line up with the normal matrix. shen-swift has no Ratatoskr builder
-// yet, so it is absent and shows SKIP.
+// results line up with the normal matrix. All eight bifrost ports now have a
+// Ratatoskr builder.
 //
 // The `julia` target is special: shen-julia's stand-alone artifact AOT-compiles
 // the shaken kernel+user KL into baked Julia methods and (per builders.json)
 // bakes a per-program sysimage via PackageCompiler — the Julia analogue of the
 // Lisp saved image / Go-Rust native binary. That bake costs minutes, so the
 // shake timeout below is generous. The `scheme` target compiles the shaken slice
-// with shen-scheme's own kl->scheme into a self-contained Chez artifact.
+// with shen-scheme's own kl->scheme into a self-contained Chez artifact; the
+// `swift` target drives the shen-swift tree-walking interpreter on the slice
+// (boot a ~200-line shaken kernel instead of the full ~2500-line kernel).
 var targetToImpl = map[string]string{
 	"lisp": "shen-cl", "lua": "shen-lua", "go": "shen-go",
 	"rust": "shen-rust", "js": "ShenScript", "julia": "shen-julia",
-	"scheme": "shen-scheme",
+	"scheme": "shen-scheme", "swift": "shen-swift",
 }
 
 const shakeTargetTimeout = 20 * time.Minute // accommodates the julia sysimage bake