Add Data::merge for merging signature data

rust/signature.rs

@@ -28,6 +28,43 @@ impl Data {
             .map(Into::into)
     }
 
+    pub fn merge(entries: &[Data]) -> Data {
+        let mut merged_data = Data::default();
+        merged_data
+            .types
+            .extend(entries.iter().flat_map(|e| &e.types).cloned());
+        // Now sort and remove types with the same guid.
+        merged_data
+            .types
+            .sort_unstable_by(|a, b| a.guid.cmp(&b.guid));
+        merged_data.types.dedup_by_key(|ty| ty.guid);
+        merged_data
+            .functions
+            .extend(entries.iter().flat_map(|e| &e.functions).cloned());
+        // Now sort and remove functions with the same symbol and guid.
+        merged_data
+            .functions
+            .sort_unstable_by(|a, b| a.symbol.name.cmp(&b.symbol.name));
+        merged_data.functions.dedup_by(|a, b| {
+            if a.guid == b.guid {
+                // Keep `a`s constraints.
+                b.constraints
+                    .adjacent
+                    .extend(a.constraints.adjacent.clone());
+                b.constraints
+                    .call_sites
+                    .extend(a.constraints.call_sites.clone());
+                b.constraints
+                    .caller_sites
+                    .extend(a.constraints.caller_sites.clone());
+                true
+            } else {
+                false
+            }
+        });
+        merged_data
+    }
+
     pub fn to_bytes(&self) -> Vec<u8> {
         let mut builder = FlatBufferBuilder::new();
         let fb_data = self.create(&mut builder);
@@ -65,3 +102,73 @@ impl From<fb::Data<'_>> for Data {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::r#type::guid::TypeGUID;
+    use crate::r#type::ComputedType;
+    use crate::signature::function::{Function, FunctionGUID};
+    use crate::symbol::class::SymbolClass;
+    use crate::symbol::Symbol;
+    use uuid::{uuid, Uuid};
+
+    const FUNC1_GUID: Uuid = uuid!("6b50fa09-c8c5-4e88-b317-5a96c01c52ee");
+    const FUNC2_GUID: Uuid = uuid!("e0565a4e-d730-4073-916c-fa6cb8ad2407");
+    const FUNC3_GUID: Uuid = uuid!("5a7eb124-b786-4aa8-af2f-ccffbb600d21");
+
+    const TYPE1_GUID: Uuid = uuid!("7aee6520-0443-4a91-910e-da068571fa7a");
+    const TYPE2_GUID: Uuid = uuid!("9e8a58f0-757d-4fa6-8c41-a4da023c5a32");
+    const TYPE3_GUID: Uuid = uuid!("f81a46df-ad7b-4d7b-a4a7-23ed22ab01ec");
+
+    // Used with `test_merge` test.
+    fn create_sample_function<T: Into<FunctionGUID>>(name: &str, guid: T) -> Function {
+        Function {
+            symbol: Symbol {
+                name: name.to_string(),
+                modifiers: Default::default(),
+                class: SymbolClass::Function,
+            },
+            guid: guid.into(),
+            constraints: Default::default(),
+            ty: rand::random(),
+            entry: None,
+        }
+    }
+
+    // Used with `test_merge` test.
+    fn create_sample_computed_type<T: Into<TypeGUID>>(guid: T) -> ComputedType {
+        let mut comp_ty = ComputedType::new(rand::random());
+        comp_ty.guid = guid.into(); // Adjust the guid for testing.
+        comp_ty
+    }
+
+    #[test]
+    fn test_merge() {
+        let first_data = Data::new(
+            vec![
+                create_sample_function("func1", FUNC1_GUID),
+                create_sample_function("func2", FUNC2_GUID),
+            ],
+            vec![
+                create_sample_computed_type(TYPE1_GUID),
+                create_sample_computed_type(TYPE2_GUID),
+            ],
+        );
+
+        let second_data = Data::new(
+            vec![
+                create_sample_function("func2", FUNC2_GUID),
+                create_sample_function("func3", FUNC3_GUID),
+            ],
+            vec![
+                create_sample_computed_type(TYPE1_GUID),
+                create_sample_computed_type(TYPE3_GUID),
+            ],
+        );
+
+        let merged_data = Data::merge(&[first_data, second_data]);
+        assert_eq!(merged_data.functions.len(), 3, "{:#?}", merged_data.functions);
+        assert_eq!(merged_data.types.len(), 3, "{:#?}", merged_data.types);
+    }
+}

rust/signature/function.rs

@@ -12,7 +12,7 @@ pub mod constraints;
 
 pub const NAMESPACE_FUNCTION: Uuid = uuid!("0192a179-61ac-7cef-88ed-012296e9492f");
 
-#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, Ord, PartialOrd)]
 pub struct FunctionGUID {
     pub guid: Uuid,
 }

rust/type/guid.rs

@@ -7,7 +7,7 @@ use uuid::{uuid, Uuid};
 
 pub const NAMESPACE_TYPEBIN: Uuid = uuid!("01929b90-72e6-73e6-9da1-2b6462e407a6");
 
-#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, Ord, PartialOrd)]
 pub struct TypeGUID {
     guid: Uuid,
 }