Add native loader entry points (#9275)

sdk/src/native_loader.rs

@@ -1,13 +1,46 @@
 use crate::{account::Account, hash::Hash};
+use num_derive::FromPrimitive;
 
 crate::declare_id!("NativeLoader1111111111111111111111111111111");
 
+#[derive(Debug, Clone, Deserialize, Eq, Hash, PartialEq, Serialize)]
+pub struct Info {
+    pub kind: Kind,
+    pub name: String,
+}
+#[derive(Debug, Clone, Copy, Deserialize, Eq, FromPrimitive, Hash, PartialEq, Serialize)]
+pub enum Kind {
+    Program = 1,
+    Loader = 2,
+}
+
+#[macro_export]
+macro_rules! native_program_info(
+    ($name:expr) => (
+        $crate::native_loader::Info {
+            kind: $crate::native_loader::Kind::Program,
+            name: $name.to_string(),
+        }
+    )
+);
+#[macro_export]
+macro_rules! native_loader_info(
+    ($name:expr) => (
+        $crate::native_loader::Info {
+            kind: $crate::native_loader::Kind::Loader,
+            name: $name.to_string(),
+        }
+    )
+);
+
 /// Create an executable account with the given shared object name.
-pub fn create_loadable_account(name: &str) -> Account {
+pub fn create_loadable_account(info: &Info) -> Account {
+    let mut data = vec![info.kind as u8];
+    data.extend_from_slice(info.name.as_bytes());
     Account {
         lamports: 1,
         owner: id(),
-        data: name.as_bytes().to_vec(),
+        data,
         executable: true,
         rent_epoch: 0,
         hash: Hash::default(),