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