mirror of https://github.com/rui314/chibicc
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
#ifndef __STDARG_H
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#define __STDARG_H
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typedef struct {
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unsigned int gp_offset;
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unsigned int fp_offset;
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void *overflow_arg_area;
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void *reg_save_area;
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} __va_elem;
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typedef __va_elem va_list[1];
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#define va_start(ap, last) \
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do { *(ap) = *(__va_elem *)__va_area__; } while (0)
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#define va_end(ap)
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static void *__va_arg_mem(__va_elem *ap, int sz, int align) {
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void *p = ap->overflow_arg_area;
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if (align > 8)
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p = (p + 15) / 16 * 16;
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ap->overflow_arg_area = ((unsigned long)p + sz + 7) / 8 * 8;
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return p;
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}
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static void *__va_arg_gp(__va_elem *ap, int sz, int align) {
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if (ap->gp_offset >= 48)
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return __va_arg_mem(ap, sz, align);
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void *r = ap->reg_save_area + ap->gp_offset;
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ap->gp_offset += 8;
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return r;
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}
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static void *__va_arg_fp(__va_elem *ap, int sz, int align) {
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if (ap->fp_offset >= 112)
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return __va_arg_mem(ap, sz, align);
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void *r = ap->reg_save_area + ap->fp_offset;
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ap->fp_offset += 8;
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return r;
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}
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#define va_arg(ap, ty) \
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({ \
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int klass = __builtin_reg_class(ty); \
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*(ty *)(klass == 0 ? __va_arg_gp(ap, sizeof(ty), _Alignof(ty)) : \
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klass == 1 ? __va_arg_fp(ap, sizeof(ty), _Alignof(ty)) : \
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__va_arg_mem(ap, sizeof(ty), _Alignof(ty))); \
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})
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#define va_copy(dest, src) ((dest)[0] = (src)[0])
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#define __GNUC_VA_LIST 1
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typedef va_list __gnuc_va_list;
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#endif
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