Add `hello-solana` example source files to SVM folder (#361)

Cargo.toml

@@ -121,7 +121,7 @@ members = [
     "zk-token-sdk",
 ]
 
-exclude = ["programs/sbf"]
+exclude = ["programs/sbf", "svm/tests/example-programs"]
 
 # This prevents a Travis CI error when building for Windows.
 resolver = "2"

svm/src/transaction_processor.rs

@@ -1195,19 +1195,26 @@ mod tests {
         }
     }
 
-    #[test]
-    fn test_load_program_from_bytes() {
+    fn load_test_program() -> Vec<u8> {
         let mut dir = env::current_dir().unwrap();
         dir.push("tests");
+        dir.push("example-programs");
+        dir.push("hello-solana");
         dir.push("hello_solana_program.so");
         let mut file = File::open(dir.clone()).expect("file not found");
         let metadata = fs::metadata(dir).expect("Unable to read metadata");
         let mut buffer = vec![0; metadata.len() as usize];
         file.read_exact(&mut buffer).expect("Buffer overflow");
+        buffer
+    }
+
+    #[test]
+    fn test_load_program_from_bytes() {
+        let buffer = load_test_program();
 
         let mut metrics = LoadProgramMetrics::default();
         let loader = bpf_loader_upgradeable::id();
-        let size = metadata.len() as usize;
+        let size = buffer.len();
         let slot = 2;
         let environment = ProgramRuntimeEnvironment::new(BuiltinProgram::new_mock());
 
@@ -1303,13 +1310,7 @@ mod tests {
         );
         assert_eq!(result, Arc::new(loaded_program));
 
-        let mut dir = env::current_dir().unwrap();
-        dir.push("tests");
-        dir.push("hello_solana_program.so");
-        let mut file = File::open(dir.clone()).expect("file not found");
-        let metadata = fs::metadata(dir).expect("Unable to read metadata");
-        let mut buffer = vec![0; metadata.len() as usize];
-        file.read_exact(&mut buffer).expect("buffer overflow");
+        let buffer = load_test_program();
         account_data.set_data(buffer);
 
         mock_bank
@@ -1376,13 +1377,7 @@ mod tests {
         );
         assert_eq!(result, Arc::new(loaded_program));
 
-        let mut dir = env::current_dir().unwrap();
-        dir.push("tests");
-        dir.push("hello_solana_program.so");
-        let mut file = File::open(dir.clone()).expect("file not found");
-        let metadata = fs::metadata(dir).expect("Unable to read metadata");
-        let mut buffer = vec![0; metadata.len() as usize];
-        file.read_exact(&mut buffer).expect("buffer overflow");
+        let mut buffer = load_test_program();
         let mut header = bincode::serialize(&state).unwrap();
         let mut complement = vec![
             0;
@@ -1461,13 +1456,7 @@ mod tests {
             vec![0; std::cmp::max(0, LoaderV4State::program_data_offset() - header.len())];
         header.append(&mut complement);
 
-        let mut dir = env::current_dir().unwrap();
-        dir.push("tests");
-        dir.push("hello_solana_program.so");
-        let mut file = File::open(dir.clone()).expect("file not found");
-        let metadata = fs::metadata(dir).expect("Unable to read metadata");
-        let mut buffer = vec![0; metadata.len() as usize];
-        file.read_exact(&mut buffer).expect("buffer overflow");
+        let mut buffer = load_test_program();
         header.append(&mut buffer);
 
         account_data.set_data(header);

svm/tests/example-programs/hello-solana/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "hello-solana-program"
+version = "2.0.0"
+edition = "2021"
+
+[dependencies]
+solana-program = { path = "../../../../sdk/program", version = "=2.0.0" }
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[workspace]

svm/tests/example-programs/hello-solana/src/lib.rs

@@ -0,0 +1,15 @@
+use solana_program::{
+    account_info::AccountInfo, entrypoint, entrypoint::ProgramResult, msg, pubkey::Pubkey,
+};
+
+entrypoint!(process_instruction);
+
+fn process_instruction(
+    _program_id: &Pubkey,
+    _accounts: &[AccountInfo],
+    _instruction_data: &[u8],
+) -> ProgramResult {
+    msg!("Hello, Solana!");
+
+    Ok(())
+}

svm/tests/integration_test.rs

@@ -188,8 +188,8 @@ fn prepare_transactions(
     // Loading the program file
     let mut dir = env::current_dir().unwrap();
     dir.push("tests");
-    // File compiled from
-    // https://github.com/solana-developers/program-examples/blob/feb82f254a4633ce2107d06060f2d0558dc987f5/basics/hello-solana/native/program/src/lib.rs
+    dir.push("example-programs");
+    dir.push("hello-solana");
     dir.push("hello_solana_program.so");
     let mut file = File::open(dir.clone()).expect("file not found");
     let metadata = fs::metadata(dir).expect("Unable to read metadata");