diff options
Diffstat (limited to 'py/nlr.h')
| -rw-r--r-- | py/nlr.h | 20 |
1 files changed, 19 insertions, 1 deletions
@@ -2,12 +2,14 @@ // 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__) @@ -19,13 +21,29 @@ struct _nlr_buf_t { #elif defined(__thumb2__) void *regs[10]; #else -#error Unknown arch in nlr.h + #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; +void nlr_setjmp_jump(void *val) __attribute__((noreturn)); +// 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); void nlr_jump(void *val) __attribute__((noreturn)); +#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 |