From 7212ba170d8db040ac99d0fb47c7b1df70df6e11 Mon Sep 17 00:00:00 2001
From: Rongsong Shen <rshen@shenrs.eu>
Date: Fri, 24 Apr 2026 16:59:51 +0800
Subject: [PATCH] add cow support of varray and version 0.0.2

---
 include/rtti/typeinfo.h |  9 +++++++++
 meson.build             |  2 +-
 nixSupport/librtti.nix  |  2 +-
 src/meson.build         |  2 +-
 src/varray.c            | 36 ++++++++++++++++++++++++++++++++++++
 5 files changed, 48 insertions(+), 3 deletions(-)

diff --git a/include/rtti/typeinfo.h b/include/rtti/typeinfo.h
index e82f218..7277b53 100644
--- a/include/rtti/typeinfo.h
+++ b/include/rtti/typeinfo.h
@@ -5,6 +5,7 @@
 #include <stdarg.h>
 #include <stddef.h>
 #include <stdint.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/types.h>
@@ -170,6 +171,10 @@ typedef int (*vget_vec_fn_t)(meta_obj_t*, int, int*, void**);
 typedef int (*vput_fn_t)(meta_obj_t*, int, void*);
 typedef int (*vput_vec_fn_t)(meta_obj_t*, int, int*, void**);
 typedef int (*vclear_fn_t)(meta_obj_t*, int);
+/* COW snapshot support — freeze/thaw for application-level copy-on-write */
+typedef bool (*retain_fn_t)(void*, void*);
+typedef int (*vfreeze_fn_t)(meta_obj_t*);
+typedef int (*vthaw_fn_t)(meta_obj_t*, retain_fn_t, void*);
 
 typedef struct {
     vstore_fn_t   vstore;
@@ -178,6 +183,8 @@ typedef struct {
     vput_fn_t     vput;
     vput_vec_fn_t vput_vec;
     vclear_fn_t   vclear;
+    vfreeze_fn_t  vfreeze; /* NEW — freeze (O(1) ptr swap) */
+    vthaw_fn_t    vthaw;   /* NEW — thaw + merge + GC */
 } intf_varray_t;
 
 /* attrs API */
@@ -257,6 +264,8 @@ extern int vget_vec(var, int, int*, void**);
 extern int vput(var, int, void*);
 extern int vput_vec(var, int, int*, void**);
 extern int vclear(var, int);
+extern int vfreeze(var);
+extern int vthaw(var, retain_fn_t, void*);
 
 extern int attr_get(var, void*, void**);
 extern int attr_set(var, void*, void*);
diff --git a/meson.build b/meson.build
index 9717b72..c342434 100644
--- a/meson.build
+++ b/meson.build
@@ -1,6 +1,6 @@
 project('librtti',
         ['c'],
-        version: '0.0.1',
+        version: '0.0.2',
         meson_version: '>=1.5',
         default_options: [
           'c_std=gnu17'])
diff --git a/nixSupport/librtti.nix b/nixSupport/librtti.nix
index b992879..3e10832 100644
--- a/nixSupport/librtti.nix
+++ b/nixSupport/librtti.nix
@@ -9,7 +9,7 @@
 stdenv.mkDerivation {
 
   pname = "rtti";
-  version = "0.0.1";
+  version = "0.0.2";
 
   src = ./..;
 
diff --git a/src/meson.build b/src/meson.build
index f9630b2..b1f69fe 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -45,4 +45,4 @@ dep_librtti = declare_dependency(link_with: librtti)
 pkg.generate(librtti,
              name: 'librtti',
              description: 'runtime type information library for c',
-             version: '0.0.1')
+             version: '0.0.2')
diff --git a/src/varray.c b/src/varray.c
index 9dd883e..907035d 100644
--- a/src/varray.c
+++ b/src/varray.c
@@ -130,3 +130,39 @@ int vclear(var v, int idx)
 
     return method(obj, idx);
 }
+
+int vfreeze(var v)
+{
+    meta_obj_t*  obj    = NULL;
+    vfreeze_fn_t method = NULL;
+
+    obj = RTTI_DATA_TO_OBJ(v);
+    if (RTTI_OBJ_INVALID(obj)) {
+        return -EINVAL;
+    }
+
+    RTTI_GET_METHOD(method, obj, varray, vfreeze);
+    if (method == NULL) {
+        return -EINVAL;
+    }
+
+    return method(obj);
+}
+
+int vthaw(var v, retain_fn_t fn, void* arg)
+{
+    meta_obj_t* obj    = NULL;
+    vthaw_fn_t  method = NULL;
+
+    obj = RTTI_DATA_TO_OBJ(v);
+    if (RTTI_OBJ_INVALID(obj)) {
+        return -EINVAL;
+    }
+
+    RTTI_GET_METHOD(method, obj, varray, vthaw);
+    if (method == NULL) {
+        return -EINVAL;
+    }
+
+    return method(obj, fn, arg);
+}