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src/lib/libtcc1.c  view on Meta::CPAN

extern void free(void*);
extern void abort(void);
#endif

enum __va_arg_type {
    __va_gen_reg, __va_float_reg, __va_stack
};

/* GCC compatible definition of va_list. */
struct __va_list_struct {
    unsigned int gp_offset;
    unsigned int fp_offset;
    union {
        unsigned int overflow_offset;
        char *overflow_arg_area;
    };
    char *reg_save_area;
};

void *__va_start(void *fp)
{
    struct __va_list_struct *ap =
        (struct __va_list_struct *)malloc(sizeof(struct __va_list_struct));
    *ap = *(struct __va_list_struct *)((char *)fp - 16);
    ap->overflow_arg_area = (char *)fp + ap->overflow_offset;
    ap->reg_save_area = (char *)fp - 176 - 16;
    return ap;
}

void *__va_arg(struct __va_list_struct *ap,
               enum __va_arg_type arg_type,
               int size, int align)
{
    size = (size + 7) & ~7;
    align = (align + 7) & ~7;
    switch (arg_type) {
    case __va_gen_reg:
        if (ap->gp_offset < 48) {
            ap->gp_offset += 8;
            return ap->reg_save_area + ap->gp_offset - 8;
        }
        size = 8;
        goto use_overflow_area;

    case __va_float_reg:
        if (ap->fp_offset < 128 + 48) {
            ap->fp_offset += 16;
            return ap->reg_save_area + ap->fp_offset - 16;
        }
        size = 8;
        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) & -(long long)align);
        return ap->overflow_arg_area - size;

    default:
#ifndef __TINYC__
        fprintf(stderr, "unknown ABI type for __va_arg\n");
#endif
        abort();
    }
}

void *__va_copy(struct __va_list_struct *src)
{
    struct __va_list_struct *dest =
        (struct __va_list_struct *)malloc(sizeof(struct __va_list_struct));
    *dest = *src;
    return dest;
}

void __va_end(struct __va_list_struct *ap)
{
    free(ap);
}

#endif /* __x86_64__ */

/* Flushing for tccrun */
#if defined(__x86_64__) || defined(__i386__)

void __clear_cache(char *beginning, char *end)
{
}

#else
#warning __clear_cache not defined for this architecture, avoid using tcc -run
#endif