Pull program stubs into SDK (#10704)

sdk/src/lib.rs

@@ -74,6 +74,7 @@ pub mod entrypoint;
 pub mod log;
 pub mod program;
 pub mod program_error;
+pub mod program_stubs;
 
 // Modules not usable by on-chain programs
 #[cfg(not(feature = "program"))]

sdk/src/program_stubs.rs

@@ -0,0 +1,43 @@
+//! @brief Stubs for syscalls when building tests for x86
+
+fn print_line_to_stdout(_message: &str) {
+    #[cfg(not(feature = "program"))]
+    {
+        use std::io::{self, Write};
+        io::stdout()
+            .write_all(format!("{}\n", _message).as_bytes())
+            .unwrap();
+        io::stdout().flush().unwrap();
+    }
+}
+
+#[no_mangle]
+/// # Safety
+pub unsafe fn sol_log_(message: *const u8, length: u64) {
+    let slice = std::slice::from_raw_parts(message, length as usize);
+    let string = std::str::from_utf8(&slice).unwrap();
+    print_line_to_stdout(string);
+}
+
+#[no_mangle]
+pub fn sol_log_64_(arg1: u64, arg2: u64, arg3: u64, arg4: u64, arg5: u64) {
+    print_line_to_stdout(&format!("{} {} {} {} {}", arg1, arg2, arg3, arg4, arg5));
+}
+
+#[no_mangle]
+pub fn sol_invoke_signed_rust() {
+    print_line_to_stdout("sol_invoke_signed_rust()");
+}
+
+#[macro_export]
+macro_rules! program_stubs {
+    () => {
+        #[test]
+        fn pull_in_externs() {
+            use solana_sdk::program_stubs::{sol_invoke_signed_rust, sol_log_, sol_log_64_};
+            unsafe { sol_log_("sol_log_".as_ptr(), 8) };
+            sol_log_64_(1, 2, 3, 4, 5);
+            sol_invoke_signed_rust();
+        }
+    };
+}