From 8188c1dd5934e45a7be410d2087087b6282008d9 Mon Sep 17 00:00:00 2001
From: Jack May <jack@solana.com>
Date: Wed, 29 Sep 2021 19:50:38 -0700
Subject: [PATCH] add unchecked invokes (#20313)

---
 sdk/program/src/program.rs | 45 +++++++++++++++++++++++++++++++++-----
 1 file changed, 40 insertions(+), 5 deletions(-)

diff --git a/sdk/program/src/program.rs b/sdk/program/src/program.rs
index bf3bd1654..45873e2d6 100644
--- a/sdk/program/src/program.rs
+++ b/sdk/program/src/program.rs
@@ -2,18 +2,36 @@ use crate::{
     account_info::AccountInfo, entrypoint::ProgramResult, instruction::Instruction, pubkey::Pubkey,
 };
 
-/// Invoke a cross-program instruction
+/// Invoke a cross-program instruction.
 ///
-/// Note that the program id of the instruction being issued must also be included in
-/// `account_infos`.
+/// Notes:
+/// - RefCell checking can be compute unit expensive, to avoid that expense use
+///   `invoke_unchecked` instead, but at your own risk.
+/// - The program id of the instruction being issued must also be included in
+///   `account_infos`.
 pub fn invoke(instruction: &Instruction, account_infos: &[AccountInfo]) -> ProgramResult {
     invoke_signed(instruction, account_infos, &[])
 }
 
+/// Invoke a cross-program instruction but don't enforce RefCell handling.
+///
+/// Notes:
+/// - The missing checks ensured that the invocation doesn't violate the borrow
+///   rules of the `AccountInfo` fields that are wrapped in `RefCell`s.  To
+///   include the checks call `invoke` instead.
+/// - The program id of the instruction being issued must also be included in
+///   `account_infos`.
+pub fn invoke_unchecked(instruction: &Instruction, account_infos: &[AccountInfo]) -> ProgramResult {
+    invoke_signed_unchecked(instruction, account_infos, &[])
+}
+
 /// Invoke a cross-program instruction with program signatures
 ///
-/// Note that the program id of the instruction being issued must also be included in
-/// `account_infos`.
+/// Notes:
+/// - RefCell checking can be compute unit expensive, to avoid that expense use
+///   `invoke_signed_unchecked` instead, but at your own risk.
+/// - The program id of the instruction being issued must also be included in
+///   `account_infos`.
 pub fn invoke_signed(
     instruction: &Instruction,
     account_infos: &[AccountInfo],
@@ -35,6 +53,23 @@ pub fn invoke_signed(
         }
     }
 
+    invoke_signed_unchecked(instruction, account_infos, signers_seeds)
+}
+
+/// Invoke a cross-program instruction with program signatures but don't check
+/// RefCell handling.
+///
+/// Note:
+/// - The missing checks ensured that the invocation doesn't violate the borrow
+///   rules of the `AccountInfo` fields that are wrapped in `RefCell`s.  To
+///   include the checks call `invoke_signed` instead.
+/// - The program id of the instruction being issued must also be included in
+///   `account_infos`.
+pub fn invoke_signed_unchecked(
+    instruction: &Instruction,
+    account_infos: &[AccountInfo],
+    signers_seeds: &[&[&[u8]]],
+) -> ProgramResult {
     #[cfg(target_arch = "bpf")]
     {
         extern "C" {