// variables defining memory layout
// (these probably belong somewhere else...)
extern uint32_t _etext;
extern uint32_t _sidata;
extern uint32_t _ram_start;
extern uint32_t _sdata;
extern uint32_t _edata;
extern uint32_t _sbss;
extern uint32_t _ebss;
extern uint32_t _heap_start;
extern uint32_t _heap_end;
extern uint32_t _estack;
extern uint32_t _ram_end;

void gc_collect(void);

MP_DECLARE_CONST_FUN_OBJ(pyb_gc_obj);