Fix syscall featurization (#12714)

* Fix syscall featurization

* nudge

programs/bpf/rust/ristretto/src/lib.rs

@@ -2,21 +2,13 @@
 
 pub mod ristretto;
 
-extern crate solana_sdk;
 use crate::ristretto::ristretto_mul;
 use curve25519_dalek::{constants::RISTRETTO_BASEPOINT_POINT, scalar::Scalar};
 use solana_sdk::{
     account_info::AccountInfo, entrypoint, entrypoint::ProgramResult, info, pubkey::Pubkey,
 };
 
-entrypoint!(process_instruction);
+fn test_ristretto_mul() -> ProgramResult {
-fn process_instruction(
-    _program_id: &Pubkey,
-    _accounts: &[AccountInfo],
-    _instruction_data: &[u8],
-) -> ProgramResult {
-    info!("Ristretto multiply");
-
     let point = RISTRETTO_BASEPOINT_POINT;
     let scalar = Scalar::zero();
     let result = ristretto_mul(&point, &scalar)?;
@@ -29,3 +21,28 @@ fn process_instruction(
 
     Ok(())
 }
+
+entrypoint!(process_instruction);
+fn process_instruction(
+    _program_id: &Pubkey,
+    _accounts: &[AccountInfo],
+    _instruction_data: &[u8],
+) -> ProgramResult {
+    info!("Ristretto multiply");
+
+    test_ristretto_mul()?;
+
+    Ok(())
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    // Pull in syscall stubs when building for non-BPF targets
+    solana_sdk::program_stubs!();
+
+    #[test]
+    fn test_ristretto() {
+        test_ristretto_mul().unwrap();
+    }
+}

programs/bpf/rust/ristretto/src/ristretto.rs

@@ -1,5 +1,7 @@
 use curve25519_dalek::{ristretto::RistrettoPoint, scalar::Scalar};
-use solana_sdk::{entrypoint::SUCCESS, program_error::ProgramError};
+#[cfg(all(feature = "program", target_arch = "bpf"))]
+use solana_sdk::entrypoint::SUCCESS;
+use solana_sdk::program_error::ProgramError;
 
 /// Multiply a ristretto point with a scalar
 ///
@@ -11,6 +13,23 @@ pub fn ristretto_mul(
     point: &RistrettoPoint,
     scalar: &Scalar,
 ) -> Result<RistrettoPoint, ProgramError> {
+    // Perform the calculation inline, calling this from within a program is
+    // not supported
+    #[cfg(not(all(feature = "program", target_arch = "bpf")))]
+    {
+        Ok(point * scalar)
+    }
+    // Call via a system call to perform the calculation
+    #[cfg(all(feature = "program", target_arch = "bpf"))]
+    {
+        extern "C" {
+            fn sol_ristretto_mul(
+                point_addr: *const u8,
+                scalar_addr: *const u8,
+                result_addr: *mut u8,
+            ) -> u64;
+        }
+
         let mut result = RistrettoPoint::default();
         let status = unsafe {
             sol_ristretto_mul(
@@ -23,11 +42,5 @@ pub fn ristretto_mul(
             SUCCESS => Ok(result),
             _ => Err(status.into()),
         }
-}
+    }
-extern "C" {
-    fn sol_ristretto_mul(
-        point_addr: *const u8,
-        scalar_addr: *const u8,
-        result_addr: *mut u8,
-    ) -> u64;
 }

programs/bpf/rust/sha256/src/lib.rs

@@ -6,14 +6,30 @@ use solana_sdk::{
     info,
 };
 
-#[no_mangle]
+fn test_hasher() {
-pub extern "C" fn entrypoint(_input: *mut u8) -> u64 {
-    info!("sha256");
-
     let vals = &["Gaggablaghblagh!".as_ref(), "flurbos".as_ref()];
     let mut hasher = Hasher::default();
     hasher.hashv(vals);
     assert_eq!(hashv(vals), hasher.result());
+}
+
+#[no_mangle]
+pub extern "C" fn entrypoint(_input: *mut u8) -> u64 {
+    info!("sha256");
+
+    test_hasher();
 
     0
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    // Pull in syscall stubs when building for non-BPF targets
+    solana_sdk::program_stubs!();
+
+    #[test]
+    fn test_sha256() {
+        test_hasher();
+    }
+}

sdk/src/hash.rs

@@ -103,13 +103,16 @@ impl Hash {
 
 /// Return a Sha256 hash for the given data.
 pub fn hashv(vals: &[&[u8]]) -> Hash {
-    #[cfg(not(feature = "program"))]
+    // Perform the calculation inline, calling this from within a program is
+    // not supported
+    #[cfg(not(all(feature = "program", target_arch = "bpf")))]
     {
         let mut hasher = Hasher::default();
         hasher.hashv(vals);
         hasher.result()
     }
-    #[cfg(feature = "program")]
+    // Call via a system call to perform the calculation
+    #[cfg(all(feature = "program", target_arch = "bpf"))]
     {
         extern "C" {
             fn sol_sha256(vals: *const u8, val_len: u64, hash_result: *mut u8) -> u64;