mirror of https://github.com/zeldaret/mm.git
45 lines
1.9 KiB
C
45 lines
1.9 KiB
C
#ifndef LIBC_STDARG_H
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#define LIBC_STDARG_H
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// When building with GCC, use the official vaarg macros to avoid warnings
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// and possibly bad codegen.
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#ifdef __GNUC__
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#define va_list __builtin_va_list
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#define va_start __builtin_va_start
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#define va_arg __builtin_va_arg
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#define va_end __builtin_va_end
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#else
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typedef char *va_list;
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#define _FP 1
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#define _INT 0
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#define _STRUCT 2
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#define _VA_FP_SAVE_AREA 0x10
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#define _VA_ALIGN(p, a) (((unsigned int)(((char *)p) + ((a) > 4 ? (a) : 4) - 1)) & -((a) > 4 ? (a) : 4))
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#define va_start(vp, parmN) (vp = ((va_list)&parmN + sizeof(parmN)))
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#define __va_stack_arg(list, mode) \
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( \
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((list) = (char *)_VA_ALIGN(list, __builtin_alignof(mode)) + \
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_VA_ALIGN(sizeof(mode), 4)), \
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(((char *)list) - (_VA_ALIGN(sizeof(mode), 4) - sizeof(mode))))
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#define __va_double_arg(list, mode) \
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( \
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(((long)list & 0x1) /* 1 byte aligned? */ \
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? (list = (char *)((long)list + 7), (char *)((long)list - 6 - _VA_FP_SAVE_AREA)) \
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: (((long)list & 0x2) /* 2 byte aligned? */ \
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? (list = (char *)((long)list + 10), (char *)((long)list - 24 - _VA_FP_SAVE_AREA)) \
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: __va_stack_arg(list, mode))))
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#define va_arg(list, mode) ((mode *)(((__builtin_classof(mode) == _FP && \
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__builtin_alignof(mode) == sizeof(double)) \
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? __va_double_arg(list, mode) \
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: __va_stack_arg(list, mode))))[-1]
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#define va_end(__list)
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#endif /* __GNUC__ */
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#endif /* STDARG_H */
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