From 935aa1ab8781577350548b0db3d471d01f7d31aa Mon Sep 17 00:00:00 2001
From: Joe <jcaulfield135@gmail.com>
Date: Fri, 18 Aug 2023 11:40:30 -0600
Subject: [PATCH] added feature

---
 runtime/src/bank.rs                        | 9 +++++++++
 runtime/src/inline_feature_gate_program.rs | 5 +++++
 runtime/src/lib.rs                         | 1 +
 sdk/src/feature_set.rs                     | 5 +++++
 4 files changed, 20 insertions(+)
 create mode 100644 runtime/src/inline_feature_gate_program.rs

diff --git a/runtime/src/bank.rs b/runtime/src/bank.rs
index fff14533661d74..27d583081018f1 100644
--- a/runtime/src/bank.rs
+++ b/runtime/src/bank.rs
@@ -42,6 +42,7 @@ use {
         builtins::{BuiltinPrototype, BUILTINS},
         epoch_rewards_hasher::hash_rewards_into_partitions,
         epoch_stakes::{EpochStakes, NodeVoteAccounts},
+        inline_feature_gate_program,
         runtime_config::RuntimeConfig,
         serde_snapshot::BankIncrementalSnapshotPersistence,
         snapshot_hash::SnapshotHash,
@@ -7972,6 +7973,14 @@ impl Bank {
         if new_feature_activations.contains(&feature_set::update_hashes_per_tick::id()) {
             self.apply_updated_hashes_per_tick(DEFAULT_HASHES_PER_TICK);
         }
+
+        if new_feature_activations.contains(&feature_set::feature_gate_program::id()) {
+            self.replace_empty_account_with_upgradeable_program(
+                &feature::id(),
+                &inline_feature_gate_program::noop_program::id(),
+                "bank-apply_feature_gate_program",
+            );
+        }
     }
 
     fn apply_updated_hashes_per_tick(&mut self, hashes_per_tick: u64) {
diff --git a/runtime/src/inline_feature_gate_program.rs b/runtime/src/inline_feature_gate_program.rs
new file mode 100644
index 00000000000000..84391b3054d0be
--- /dev/null
+++ b/runtime/src/inline_feature_gate_program.rs
@@ -0,0 +1,5 @@
+solana_sdk::declare_id!("Feature111111111111111111111111111111111111");
+
+pub(crate) mod noop_program {
+    solana_sdk::declare_id!("5Re2FUHmvSdem1KV2bU5GFvqZpP2MXj76yVhMKKbP45o");
+}
diff --git a/runtime/src/lib.rs b/runtime/src/lib.rs
index 7978048c8540a8..54b3df07f8253e 100644
--- a/runtime/src/lib.rs
+++ b/runtime/src/lib.rs
@@ -14,6 +14,7 @@ pub mod commitment;
 mod epoch_rewards_hasher;
 pub mod epoch_stakes;
 pub mod genesis_utils;
+pub mod inline_feature_gate_program;
 pub mod inline_spl_associated_token_account;
 pub mod loader_utils;
 pub mod non_circulating_supply;
diff --git a/sdk/src/feature_set.rs b/sdk/src/feature_set.rs
index cd768991c71807..af7aebf71d7096 100644
--- a/sdk/src/feature_set.rs
+++ b/sdk/src/feature_set.rs
@@ -687,6 +687,10 @@ pub mod reduce_stake_warmup_cooldown {
     }
 }
 
+pub mod feature_gate_program {
+    solana_sdk::declare_id!("8GdovDzVwWU5edz2G697bbB7GZjrUc6aQZLWyNNAtHdg");
+}
+
 lazy_static! {
     /// Map of feature identifiers to user-visible description
     pub static ref FEATURE_NAMES: HashMap<Pubkey, &'static str> = [
@@ -851,6 +855,7 @@ lazy_static! {
         (bpf_account_data_direct_mapping::id(), "use memory regions to map account data into the rbpf vm instead of copying the data"),
         (last_restart_slot_sysvar::id(), "enable new sysvar last_restart_slot"),
         (reduce_stake_warmup_cooldown::id(), "reduce stake warmup cooldown from 25% to 9%"),
+        (feature_gate_program::id(), "control feature activations with an on-chain program"),
         /*************** ADD NEW FEATURES HERE ***************/
     ]
     .iter()