From 52fbe55d52837667273b109d8e1e887854449d90 Mon Sep 17 00:00:00 2001
From: "Jean Marchand (Exotic Markets)" <jeanno11@orange.fr>
Date: Tue, 26 Dec 2023 22:21:42 +0100
Subject: [PATCH] spl: Remove shared memory program (#2747)

---
 CHANGELOG.md     |  1 +
 spl/Cargo.toml   |  2 +-
 spl/src/lib.rs   |  3 ---
 spl/src/shmem.rs | 50 ------------------------------------------------
 4 files changed, 2 insertions(+), 54 deletions(-)
 delete mode 100644 spl/src/shmem.rs

diff --git a/CHANGELOG.md b/CHANGELOG.md
index addae99c9a..3ca6ac57f4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -40,6 +40,7 @@ The minor version will be incremented upon a breaking change and the patch versi
 - ts: Remove `anchor-deprecated-state` feature ([#2717](https://github.com/coral-xyz/anchor/pull/2717)).
 - lang: Remove `CLOSED_ACCOUNT_DISCRIMINATOR` ([#2726](https://github.com/coral-xyz/anchor/pull/2726)).
 - lang: Make bumps of optional accounts `Option<u8>` rather than `u8` ([#2730](https://github.com/coral-xyz/anchor/pull/2730)).
+- spl: Remove `shared-memory` program ([#2747](https://github.com/coral-xyz/anchor/pull/2747)).
 
 ## [0.29.0] - 2023-10-16
 
diff --git a/spl/Cargo.toml b/spl/Cargo.toml
index 42b3294b4a..d61deef5be 100644
--- a/spl/Cargo.toml
+++ b/spl/Cargo.toml
@@ -17,7 +17,6 @@ idl-build = ["anchor-lang/idl-build"]
 memo = ["spl-memo"]
 metadata = ["mpl-token-metadata"]
 mint = []
-shmem = []
 stake = ["borsh"]
 token = ["spl-token"]
 token_2022 = ["spl-token-2022"]
@@ -32,3 +31,4 @@ spl-associated-token-account = { version = "2.2", features = ["no-entrypoint"],
 spl-memo = { version = "4", features = ["no-entrypoint"], optional = true }
 spl-token = { version = "4", features = ["no-entrypoint"], optional = true }
 spl-token-2022 = { version = "0.9", features = ["no-entrypoint"], optional = true }
+
diff --git a/spl/src/lib.rs b/spl/src/lib.rs
index 1a485948d4..6ec5129ff4 100644
--- a/spl/src/lib.rs
+++ b/spl/src/lib.rs
@@ -19,9 +19,6 @@ pub mod dex;
 #[cfg(feature = "governance")]
 pub mod governance;
 
-#[cfg(feature = "shmem")]
-pub mod shmem;
-
 #[cfg(feature = "stake")]
 pub mod stake;
 
diff --git a/spl/src/shmem.rs b/spl/src/shmem.rs
deleted file mode 100644
index 81a9f15869..0000000000
--- a/spl/src/shmem.rs
+++ /dev/null
@@ -1,50 +0,0 @@
-//! CPI API for interacting with the SPL shared memory
-//! [program](https://github.com/solana-labs/solana-program-library/tree/master/shared-memory).
-
-use anchor_lang::{context::CpiContext, Accounts};
-use solana_program::account_info::AccountInfo;
-use solana_program::declare_id;
-use solana_program::entrypoint::ProgramResult;
-use solana_program::instruction::{AccountMeta, Instruction};
-use solana_program::program;
-use solana_program::pubkey::Pubkey;
-
-// TODO: update this once the final shared memory program gets released.
-//       shmem4EWT2sPdVGvTZCzXXRAURL9G5vpPxNwSeKhHUL.
-declare_id!("DynWy94wrWp5RimU49creYMQ5py3Up8BBNS4VA73VCpi");
-
-/// `ret` writes the given `data` field to the shared memory account
-/// acting as a return value that can be used across CPI.
-/// The caleee should use this to write data into the shared memory account.
-/// The caler should use the account directly to pull out and interpret the
-/// bytes. Shared memory serialization is not specified and is up to the
-/// caller and callee.
-pub fn ret<'a, 'b, 'c, 'info>(
-    ctx: CpiContext<'a, 'b, 'c, 'info, Ret<'info>>,
-    data: Vec<u8>,
-) -> ProgramResult {
-    let instruction = Instruction {
-        program_id: *ctx.program.key,
-        accounts: vec![AccountMeta::new(*ctx.accounts.buffer.key, false)],
-        data,
-    };
-    let mut accounts = vec![ctx.accounts.buffer];
-    accounts.push(ctx.program.clone());
-    program::invoke(&instruction, &accounts)
-}
-
-#[derive(Accounts)]
-pub struct Ret<'info> {
-    #[account(mut)]
-    pub buffer: AccountInfo<'info>,
-}
-
-// A set of accounts that can be used with shared memory.
-#[derive(Accounts)]
-pub struct Shmem<'info> {
-    // Shared memory account to write the return value into.
-    #[account(mut, constraint = shmem.owner == shmem_program.key)]
-    pub shmem: AccountInfo<'info>,
-    #[account(constraint = shmem_program.key == &ID)]
-    pub shmem_program: AccountInfo<'info>,
-}