Function json_parse 

pub fn json_parse(
    input: &str,
    obj_pool: &mut ObjectPool,
    map_pool: &mut MapPool,
    str_pool: &mut StringPool,
    registers: &RegisterFile,
    recursion_stack: &mut RegisterFile,
    gc: &mut GcState,
) -> Result<Data, &'static str>

Parses a json document into a Data graph. A malformed document returns a short static reason.

A collection the parse starts reads registers and recursion_stack as its roots, so every other value the program still holds has to be reachable from them, and the caller stores the result before it allocates again.