Initial population of solana-program-sdk

sdk/program/src/program_stubs.rs

@@ -0,0 +1,53 @@
+//! @brief Syscall stubs when building for programs for non-BPF targets
+
+#![cfg(not(target_arch = "bpf"))]
+
+use crate::{account_info::AccountInfo, entrypoint::ProgramResult, instruction::Instruction};
+use std::sync::{Arc, RwLock};
+
+lazy_static::lazy_static! {
+    static ref SYSCALL_STUBS: Arc<RwLock<Box<dyn SyscallStubs>>> = Arc::new(RwLock::new(Box::new(DefaultSyscallStubs {})));
+}
+
+// The default syscall stubs don't do much, but `set_syscalls()` can be used to swap in
+// alternatives
+pub fn set_syscall_stubs(syscall_stubs: Box<dyn SyscallStubs>) -> Box<dyn SyscallStubs> {
+    std::mem::replace(&mut SYSCALL_STUBS.write().unwrap(), syscall_stubs)
+}
+
+pub trait SyscallStubs: Sync + Send {
+    fn sol_log(&self, message: &str) {
+        println!("{}", message);
+    }
+    fn sol_invoke_signed(
+        &self,
+        _instruction: &Instruction,
+        _account_infos: &[AccountInfo],
+        _signers_seeds: &[&[&[u8]]],
+    ) -> ProgramResult {
+        sol_log("SyscallStubs: sol_invoke_signed() not available");
+        Ok(())
+    }
+}
+
+struct DefaultSyscallStubs {}
+impl SyscallStubs for DefaultSyscallStubs {}
+
+pub(crate) fn sol_log(message: &str) {
+    SYSCALL_STUBS.read().unwrap().sol_log(message);
+}
+
+pub(crate) fn sol_log_64(arg1: u64, arg2: u64, arg3: u64, arg4: u64, arg5: u64) {
+    sol_log(&format!("{} {} {} {} {}", arg1, arg2, arg3, arg4, arg5));
+}
+
+pub(crate) fn sol_invoke_signed(
+    instruction: &Instruction,
+    account_infos: &[AccountInfo],
+    signers_seeds: &[&[&[u8]]],
+) -> ProgramResult {
+    SYSCALL_STUBS
+        .read()
+        .unwrap()
+        .sol_invoke_signed(instruction, account_infos, signers_seeds)
+}