Method get_array_var

core/src/vm/mod.rs:207–230

Returns the array element named `key` from `vars`, decoding values from `read_raw`.

(
        &self,
        image: &Image,
        key: &SymbolKey,
        vars: &HashMap<SymbolKey, GlobalVarInfo>,
        subscripts: &[i32],
        read_raw: fn(&Context, u8) -> u64,
    )

    /// Returns the array element named `key` from `vars`, decoding values from `read_raw`.
    fn get_array_var(
        &self,
        image: &Image,
        key: &SymbolKey,
        vars: &HashMap<SymbolKey, GlobalVarInfo>,
        subscripts: &[i32],
        read_raw: fn(&Context, u8) -> u64,
    ) -> GetGlobalResult<Option<ConstantDatum>> {
        let Some(info) = vars.get(key) else {
            return Ok(None);
        };
        if info.ndims == 0 {
            return Err(GetGlobalError::IsScalar(key.to_string()));
        }
        let raw = read_raw(&self.context, info.reg);
        let ptr = DatumPtr::from(raw);
        let heap_idx = ptr.heap_index();
        let HeapDatum::Array(a) = self.heap.get(heap_idx) else {
            panic!("Array variable does not point to an array on the heap");
        };
        let flat_idx = a.flat_index(subscripts).map_err(GetGlobalError::SubscriptOutOfBounds)?;
        let v = a.values[flat_idx];
        Ok(Some(ConstantDatum::from_raw(v, info.subtype, &image.constants, &self.heap)))
    }

    /// Creates a new VM with the given `upcalls_by_name` as the available built-in callables.
    pub fn new(upcalls_by_name: HashMap<SymbolKey, Rc<dyn Callable>>) -> Self {