How to directly execute a Sierra program in vm

[Subway2023]

I want to directly execute a Sierra program, but I don't know how to construct contracts_info.

pub fn load_sierra_path(program_path: &str) -> SierraCasmRunner {
    let sierra_code = match fs::read_to_string("some_file_path") {
        Ok(code) => code,
        Err(e) => {
            eprintln!("Failed to read Sierra file: {}", e);
            std::process::exit(1);
        }
    };
    let program = match ProgramParser::new().parse(&sierra_code) {
        Ok(p) => p,
        Err(_) => {
            eprintln!(
                "Failed to parse sierra program."
            );
            std::process::exit(1);
        }
    };

    let runner = SierraCasmRunner::new(
        program.clone(),
        Some(Default::default()),
        contracts_info,    // how to construct contracts_info.
        None,
    )
    .unwrap();

    runner
}

[JulianGCalderon]

Hi! Those structures are defined in https://github.com/starkware-libs/cairo/tree/main. You can checkout that repository for examples. The following links may result useful:

• https://github.com/starkware-libs/cairo/blob/825b42d05399ba8d38d27cf3f30496c4acafa1fe/crates/bin/cairo-run/src/main.rs#L82-L91
• https://github.com/starkware-libs/cairo/blob/825b42d05399ba8d38d27cf3f30496c4acafa1fe/crates/cairo-lang-starknet/src/contract.rs#L295-L306

[Subway2023]

Can contracts_info be generated if only the Sierra program is available? I see that contracts_info requires the cairo program to generate.

[azteca1998]

It can if you know what it has, but I'll assume you don't.

By Sierra do you mean a JSON with lots of data, or actual Sierra code? If it's a JSON then that information should already be embedded within. If your code is not throwing an error when calling ProgramParser::parse(...) then you most likely have actual Sierra code, which doesn't have that information anymore.

If you can get your hands on the JSON Sierra then you should load it with serde and extract the Program and ContractInfo from there.

[Subway2023]

In the case where only the Sierra program is available (without a JSON file), how should the ContractInfo be constructed in order to execute the Sierra program?

[azteca1998]

As I said, you don't have that information therefore you can't do it.

If you absolutely have to then just create this structure manually with the correct contract entry points and their identifiers. Note that we will not be able to help you with that.

[Subway2023]

ok，thanks