circuitpython/stm/gccollect.h

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// variables defining memory layout
// (these probably belong somewhere else...)
extern uint32_t _text_end;
extern uint32_t _data_start_init;
extern uint32_t _ram_start;
extern uint32_t _data_start;
extern uint32_t _data_end;
extern uint32_t _bss_start;
extern uint32_t _bss_end;
extern uint32_t _heap_start;
extern uint32_t _heap_end;
extern uint32_t _stack_end;
extern uint32_t _ram_end;
void gc_collect(void);
MP_DECLARE_CONST_FUN_OBJ(pyb_gc_obj);