From 116b7699b8e4cba8afca107e893552d6db2fc864 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alexander=20Mei=C3=9Fner?= <AlexanderMeissner@gmx.net>
Date: Thu, 18 May 2023 15:18:24 +0000
Subject: [PATCH] Prevents built-ins from being pruned.

---
 ledger-tool/src/program.rs             |  4 ++--
 ledger/src/blockstore_processor.rs     |  2 +-
 program-runtime/src/loaded_programs.rs |  4 +++-
 runtime/benches/bank.rs                |  2 +-
 runtime/src/builtins.rs                | 11 ++++++++++-
 5 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/ledger-tool/src/program.rs b/ledger-tool/src/program.rs
index 1522c82e2584dd..8488b52d2425db 100644
--- a/ledger-tool/src/program.rs
+++ b/ledger-tool/src/program.rs
@@ -531,7 +531,7 @@ pub fn program(ledger_path: &Path, matches: &ArgMatches<'_>) {
         AccountSharedData::new(0, 0, &loader_id),
     ));
     let interpreted = matches.value_of("mode").unwrap() != "jit";
-    with_mock_invoke_context!(invoke_context, transaction_context, transaction_accounts,);
+    with_mock_invoke_context!(invoke_context, transaction_context, transaction_accounts);
 
     // Adding `DELAY_VISIBILITY_SLOT_OFFSET` to slots to accommodate for delay visibility of the program
     let mut loaded_programs =
@@ -548,7 +548,7 @@ pub fn program(ledger_path: &Path, matches: &ArgMatches<'_>) {
         debug!("Loaded program {}", key);
         loaded_programs.replenish(key, program);
     }
-    invoke_context.programs_loaded_for_tx_batch = &mut loaded_programs;
+    invoke_context.programs_loaded_for_tx_batch = &loaded_programs;
 
     invoke_context
         .transaction_context
diff --git a/ledger/src/blockstore_processor.rs b/ledger/src/blockstore_processor.rs
index 167fff4581ec3d..b81212be870272 100644
--- a/ledger/src/blockstore_processor.rs
+++ b/ledger/src/blockstore_processor.rs
@@ -1840,7 +1840,7 @@ pub mod tests {
         matches::assert_matches,
         rand::{thread_rng, Rng},
         solana_entry::entry::{create_ticks, next_entry, next_entry_mut},
-        solana_program_runtime::{declare_process_instruction, loaded_programs::LoadedProgram},
+        solana_program_runtime::declare_process_instruction,
         solana_runtime::{
             genesis_utils::{
                 self, create_genesis_config_with_vote_accounts, ValidatorVoteKeypairs,
diff --git a/program-runtime/src/loaded_programs.rs b/program-runtime/src/loaded_programs.rs
index 59c1b8e8e547b9..0d277852c1a6bf 100644
--- a/program-runtime/src/loaded_programs.rs
+++ b/program-runtime/src/loaded_programs.rs
@@ -473,7 +473,9 @@ impl LoadedPrograms {
                 .rev()
                 .filter(|entry| {
                     let relation = fork_graph.relationship(entry.deployment_slot, new_root);
-                    if entry.deployment_slot >= new_root {
+                    if matches!(entry.program, LoadedProgramType::Builtin(_)) {
+                        true
+                    } else if entry.deployment_slot >= new_root {
                         matches!(relation, BlockRelation::Equal | BlockRelation::Descendant)
                     } else if !first_ancestor_found
                         && (matches!(relation, BlockRelation::Ancestor)
diff --git a/runtime/benches/bank.rs b/runtime/benches/bank.rs
index ae52df772db671..ed43f1dae818e0 100644
--- a/runtime/benches/bank.rs
+++ b/runtime/benches/bank.rs
@@ -5,7 +5,7 @@ extern crate test;
 
 use {
     log::*,
-    solana_program_runtime::{declare_process_instruction, loaded_programs::LoadedProgram},
+    solana_program_runtime::declare_process_instruction,
     solana_runtime::{
         bank::{test_utils::goto_end_of_slot, *},
         bank_client::BankClient,
diff --git a/runtime/src/builtins.rs b/runtime/src/builtins.rs
index f7d5599191fbeb..d692101aaab42f 100644
--- a/runtime/src/builtins.rs
+++ b/runtime/src/builtins.rs
@@ -27,7 +27,16 @@ impl std::fmt::Debug for BuiltinPrototype {
 impl solana_frozen_abi::abi_example::AbiExample for BuiltinPrototype {
     fn example() -> Self {
         // BuiltinPrototype isn't serializable by definition.
-        Self::default()
+        solana_program_runtime::declare_process_instruction!(entrypoint, 0, |_invoke_context| {
+            // Do nothing
+            Ok(())
+        });
+        Self {
+            feature_id: None,
+            program_id: Pubkey::default(),
+            name: "",
+            entrypoint,
+        }
     }
 }