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Move lib/va_list.c into include/tccdefs.h

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This makes code with va_arg work with -nostdlib on x86_64.
This commit is contained in:
herman ten brugge
2025-11-19 08:31:15 +01:00
parent 3e8f1da9c5
commit fa6a6bfbbd
3 changed files with 43 additions and 71 deletions
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43
include/tccdefs.h
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@@ -191,7 +191,10 @@
#if defined __x86_64__
#if !defined _WIN32
/* GCC compatible definition of va_list. */
/* This should be in sync with the declaration in our lib/libtcc1.c */
enum __va_arg_type {
__va_gen_reg, __va_float_reg, __va_stack
};
typedef struct {
unsigned gp_offset, fp_offset;
union {
@@ -201,7 +204,43 @@
char *reg_save_area;
} __builtin_va_list[1];
void *__va_arg(__builtin_va_list ap, int arg_type, int size, int align);
static inline void *__va_arg(__builtin_va_list ap, int arg_type,
int size, int align)
{
size = (size + 7) & ~7;
align = (align + 7) & ~7;
switch ((enum __va_arg_type)arg_type) {
case __va_gen_reg:
if (ap->gp_offset + size <= 48) {
ap->gp_offset += size;
return ap->reg_save_area + ap->gp_offset - size;
}
goto use_overflow_area;
case __va_float_reg:
if (ap->fp_offset < 128 + 48) {
ap->fp_offset += 16;
if (size == 8)
return ap->reg_save_area + ap->fp_offset - 16;
if (ap->fp_offset < 128 + 48) {
double *p = (double *)(ap->reg_save_area + ap->fp_offset);
p[-1] = p[0];
ap->fp_offset += 16;
return ap->reg_save_area + ap->fp_offset - 32;
}
}
goto use_overflow_area;
case __va_stack:
use_overflow_area:
ap->overflow_arg_area += size;
ap->overflow_arg_area =
(char*)((long long)(ap->overflow_arg_area + align - 1) & -align);
return ap->overflow_arg_area - size;
default: /* should never happen */
char *a = (char *)0; *a = 0; // abort
return 0;
}
}
#define __builtin_va_start(ap, last) \
(*(ap) = *(__builtin_va_list)((char*)__builtin_frame_address(0) - 24))
#define __builtin_va_arg(ap, t) \