chaokunyang commented on code in PR #3094:
URL: https://github.com/apache/fory/pull/3094#discussion_r2653209713
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rust/fory-derive/src/object/util.rs:
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@@ -1117,109 +1115,151 @@ fn to_snake_case(name: &str) -> String {
result
}
-/// Computes the fingerprint string for a struct type used in schema
versioning.
-///
-/// **Fingerprint Format:**
-///
-/// Each field contributes: `<field_name_or_id>,<type_id>,<ref>,<nullable>;`
-///
-/// Fields are sorted by field name (snake_case) lexicographically.
-///
-/// **Field Components:**
-/// - `field_name_or_id`: snake_case field name, or tag ID if `#[fory(id =
N)]` is set
-/// - `type_id`: Fory TypeId as decimal string (e.g., "4" for INT32)
-/// - `ref`: "1" if reference tracking enabled, "0" otherwise
-/// - `nullable`: "1" if null flag is written, "0" otherwise
+/// Field metadata for fingerprint computation.
+struct FieldFingerprintInfo {
+ /// Field name (snake_case) or field ID as string
+ name_or_id: String,
+ /// Whether the field has explicit nullable=true/false set via
#[fory(nullable)]
+ explicit_nullable: Option<bool>,
+ /// Whether reference tracking is enabled
+ ref_tracking: bool,
+ /// The field type for TypeId detection
+ field_type: Type,
+}
+
+/// Generates code to compute struct version hash at runtime.
///
-/// **Example fingerprint:** `"age,4,0,0;name,12,0,1;"`
+/// The generated code:
+/// 1. Uses `OnceLock` to cache the computed hash (computed only once)
+/// 2. For user-defined types (TypeId::UNKNOWN at macro time), uses 0
(UNKNOWN) in fingerprint
+/// 3. Builds fingerprint string and computes MurmurHash3
///
-/// This format is consistent across Go, Java, Rust, and C++ implementations.
-pub(crate) fn compute_struct_fingerprint(fields: &[&Field]) -> String {
+/// **Fingerprint Format:** `<field_name_or_id>,<type_id>,<ref>,<nullable>;`
+/// Fields are sorted by name lexicographically.
+pub(crate) fn gen_struct_version_hash_ts(fields: &[&Field]) -> TokenStream {
Review Comment:
Another way is generate a const function, this will be zero-cost. but I'm
not sure whether it's feasible
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