neo-devpack-solidity 0.22.0

Production-focused Solidity-to-NeoVM compilation system
Documentation 
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fn emit_event(bytecode: &mut Vec<u8>, module: &ir::Module, index: usize, arg_count: usize) {
    if module.events.get(index).is_some() {
        emit_event_payload(bytecode, arg_count);
    }
}

fn emit_event_by_name(bytecode: &mut Vec<u8>, _name: &str, arg_count: usize) {
    emit_event_payload(bytecode, arg_count);
}

fn emit_event_payload(bytecode: &mut Vec<u8>, arg_count: usize) {
    // Neo N3 Runtime.Notify signature is: Notify(eventName, stateArray)
    // The lowering pushes eventName first, then the event arguments.
    let total_bigint = BigInt::from(arg_count);
    push_integer_bigint(bytecode, &total_bigint);
    bytecode.push(0xC0); // PACK arguments into an array, leaving eventName below it
    // PACK reverses argument order (it pops from the stack), but Neo ABI expects event
    // arguments to match the declared order in the manifest. Reverse the packed array
    // in-place to restore the original ordering.
    if arg_count > 1 {
        bytecode.push(0x4A); // DUP (keep a reference to the array on the stack)
        bytecode.push(0xD1); // REVERSEITEMS (consumes one reference, reverses in-place)
    }
    bytecode.push(0x50); // SWAP -> [stateArray, eventName]
    emit_syscall(bytecode, "System.Runtime.Notify");
}