Phase 12: extern registry + diagnostics, JIT host-bridge PoC by-slot, vtable Map.set + VT/PIC tracing, and tests

src/runtime/extern_registry.rs

@@ -0,0 +1,37 @@
+//! Extern interface registry (env.*) for diagnostics and optional slotting
+//!
+//! 目的: ExternCallの未登録/未対応時に候補提示やSTRICT診断を改善する。
+
+use once_cell::sync::Lazy;
+
+#[derive(Clone, Copy, Debug)]
+pub struct ExternSpec { pub iface: &'static str, pub method: &'static str, pub min_arity: u8, pub max_arity: u8 }
+
+static EXTERNS: Lazy<Vec<ExternSpec>> = Lazy::new(|| vec![
+    // console
+    ExternSpec { iface: "env.console", method: "log", min_arity: 1, max_arity: 1 },
+    // debug
+    ExternSpec { iface: "env.debug", method: "trace", min_arity: 1, max_arity: 255 },
+    // runtime
+    ExternSpec { iface: "env.runtime", method: "checkpoint", min_arity: 0, max_arity: 0 },
+    // future (scaffold)
+    ExternSpec { iface: "env.future", method: "new", min_arity: 1, max_arity: 1 },
+    ExternSpec { iface: "env.future", method: "birth", min_arity: 1, max_arity: 1 },
+    ExternSpec { iface: "env.future", method: "set", min_arity: 2, max_arity: 2 },
+    ExternSpec { iface: "env.future", method: "await", min_arity: 1, max_arity: 1 },
+]);
+
+pub fn resolve(iface: &str, method: &str) -> Option<ExternSpec> {
+    EXTERNS.iter().copied().find(|e| e.iface == iface && e.method == method)
+}
+
+pub fn known_for_iface(iface: &str) -> Vec<&'static str> {
+    let mut v: Vec<&'static str> = EXTERNS.iter().filter(|e| e.iface == iface).map(|e| e.method).collect();
+    v.sort(); v.dedup(); v
+}
+
+pub fn all_ifaces() -> Vec<&'static str> {
+    let mut v: Vec<&'static str> = EXTERNS.iter().map(|e| e.iface).collect();
+    v.sort(); v.dedup(); v
+}
+

src/runtime/mod.rs

@@ -21,6 +21,7 @@ pub mod type_box_abi; // Phase 12: Nyash ABI (vtable) 雛形
 pub mod type_registry; // Phase 12: TypeId→TypeBox 解決（雛形）
 pub mod host_handles; // C ABI(TLV) 向け HostHandle レジストリ（ユーザー/内蔵Box受け渡し）
 pub mod host_api; // C ABI: plugins -> host 逆呼び出しAPI（TLSでVMに橋渡し）
+pub mod extern_registry; // ExternCall (env.*) 登録・診断用レジストリ
 
 #[cfg(test)]
 mod tests;