Phase 12: 統一TypeBox ABI実装開始 - ChatGPT5による極小コアABI基盤構築

- TypeBox ABI雛形: メソッドスロット管理システム追加
- Type Registry: Array/Map/StringBoxの基本メソッド定義
- Host API: C ABI逆呼び出しシステム実装
- Phase 12ドキュメント整理: 設計文書統合・アーカイブ化
- MIR Builder: クリーンアップと分離実装完了

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/runtime/plugin_ffi_common.rs

@@ -28,6 +28,12 @@ pub mod decode {
         if buf.len() < 8 + size { return None; }
         Some((tag, size, &buf[8..8 + size]))
     }
+    /// Decode u64 payload (size must be 8)
+    pub fn u64(payload: &[u8]) -> Option<u64> {
+        if payload.len() != 8 { return None; }
+        let mut b = [0u8;8]; b.copy_from_slice(payload);
+        Some(u64::from_le_bytes(b))
+    }
     /// Decode bool payload (size must be 1; nonzero => true)
     pub fn bool(payload: &[u8]) -> Option<bool> {
         if payload.len() != 1 { return None; }
@@ -50,6 +56,16 @@ pub mod decode {
         String::from_utf8_lossy(payload).to_string()
     }
 
+    /// Decode plugin handle payload (type_id:u32 + instance_id:u32)
+    pub fn plugin_handle(payload: &[u8]) -> Option<(u32, u32)> {
+        if payload.len() != 8 { return None; }
+        let mut a = [0u8;4];
+        let mut b = [0u8;4];
+        a.copy_from_slice(&payload[0..4]);
+        b.copy_from_slice(&payload[4..8]);
+        Some((u32::from_le_bytes(a), u32::from_le_bytes(b)))
+    }
+
     /// Get nth TLV entry from a buffer with header
     pub fn tlv_nth(buf: &[u8], n: usize) -> Option<(u8, usize, &[u8])> {
         if buf.len() < 4 { return None; }
@@ -87,6 +103,8 @@ pub mod encode {
     const TAG_BYTES: u8 = 7;
     /// tag for Plugin Handle (type_id + instance_id)
     const TAG_HANDLE: u8 = 8;
+    /// tag for Host Handle (host-managed handle id u64)
+    const TAG_HOST_HANDLE: u8 = 9;
 
     /// Append a bool TLV entry (tag=1, size=1)
     pub fn bool(buf: &mut Vec<u8>, v: bool) {
@@ -150,6 +168,13 @@ pub mod encode {
         buf.extend_from_slice(&type_id.to_le_bytes());
         buf.extend_from_slice(&instance_id.to_le_bytes());
     }
+    /// Append a host handle TLV entry (tag=9, size=8, handle_id:u64)
+    pub fn host_handle(buf: &mut Vec<u8>, handle_id: u64) {
+        buf.push(TAG_HOST_HANDLE);
+        buf.push(0u8);
+        buf.extend_from_slice(&(8u16).to_le_bytes());
+        buf.extend_from_slice(&handle_id.to_le_bytes());
+    }
 }
 
 #[cfg(test)]