65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
// non-local return
|
|
// exception handling, basically a stack of setjmp/longjmp buffers
|
|
|
|
#include <limits.h>
|
|
#include <setjmp.h>
|
|
|
|
typedef struct _nlr_buf_t nlr_buf_t;
|
|
struct _nlr_buf_t {
|
|
// the entries here must all be machine word size
|
|
nlr_buf_t *prev;
|
|
void *ret_val;
|
|
#if !MICROPY_NLR_SETJMP
|
|
#if defined(__i386__)
|
|
void *regs[6];
|
|
#elif defined(__x86_64__)
|
|
#if defined(__CYGWIN__)
|
|
void *regs[12];
|
|
#else
|
|
void *regs[8];
|
|
#endif
|
|
#elif defined(__thumb2__)
|
|
void *regs[10];
|
|
#else
|
|
#define MICROPY_NLR_SETJMP (1)
|
|
//#warning "No native NLR support for this arch, using setjmp implementation"
|
|
#endif
|
|
#endif
|
|
|
|
#if MICROPY_NLR_SETJMP
|
|
jmp_buf jmpbuf;
|
|
#endif
|
|
};
|
|
|
|
#if MICROPY_NLR_SETJMP
|
|
extern nlr_buf_t *nlr_setjmp_top;
|
|
NORETURN void nlr_setjmp_jump(void *val);
|
|
// nlr_push() must be defined as a macro, because "The stack context will be
|
|
// invalidated if the function which called setjmp() returns."
|
|
#define nlr_push(buf) ((buf)->prev = nlr_setjmp_top, nlr_setjmp_top = (buf), setjmp((buf)->jmpbuf))
|
|
#define nlr_pop() { nlr_setjmp_top = nlr_setjmp_top->prev; }
|
|
#define nlr_jump(val) nlr_setjmp_jump(val)
|
|
#else
|
|
unsigned int nlr_push(nlr_buf_t *);
|
|
void nlr_pop(void);
|
|
NORETURN void nlr_jump(void *val);
|
|
#endif
|
|
|
|
// This must be implemented by a port. It's called by nlr_jump
|
|
// if no nlr buf has been pushed. It must not return, but rather
|
|
// should bail out with a fatal error.
|
|
void nlr_jump_fail(void *val);
|
|
|
|
// use nlr_raise instead of nlr_jump so that debugging is easier
|
|
#ifndef DEBUG
|
|
#define nlr_raise(val) nlr_jump(val)
|
|
#else
|
|
#define nlr_raise(val) \
|
|
do { \
|
|
void *_val = val; \
|
|
assert(_val != NULL); \
|
|
assert(mp_obj_is_exception_instance(_val)); \
|
|
nlr_jump(_val); \
|
|
} while (0)
|
|
#endif
|