Function put_var

core/src/compiler/syms.rs:126–145

Defines a new local or global variable (or array) and assigns a register to it. Panics if the symbol already exists.

(
    key: SymbolKey,
    proto: SymbolPrototype,
    table: &mut HashMapWithIds<SymbolKey, SymbolPrototype, u8>,
    make_register: MKR,
    scope: RegisterScope,
)

///
/// Panics if the symbol already exists.
fn put_var<MKR>(
    key: SymbolKey,
    proto: SymbolPrototype,
    table: &mut HashMapWithIds<SymbolKey, SymbolPrototype, u8>,
    make_register: MKR,
    scope: RegisterScope,
) -> Result<Register>
where
    MKR: FnOnce(u8) -> std::result::Result<Register, bytecode::OutOfRegistersError>,
{
    match table.insert(key, proto) {
        Some((None, reg)) => Ok(make_register(reg).map_err(|_| Error::OutOfRegisters(scope))?),

        Some((Some(_old_proto), _reg)) => {
            unreachable!("Cannot redefine symbol; caller must check for presence first");
        }

        None => Err(Error::OutOfRegisters(scope)),
    }
}

/// Representation of the symbol table for global symbols.
///