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Support struct arguments with stdarg.h

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- add __builtin_va_arg_types to check how arguments were passed
- move most code of stdarg into libtcc1.c
- remove __builtin_malloc and __builtin_free
- add a test case based on the bug report
  (http://www.mail-archive.com/tinycc-devel@nongnu.org/msg03036.html)
This commit is contained in:
Shinichiro Hamaji
2010-12-28 19:32:40 +09:00
parent 07fd82b411
commit 0ed7ba3f5e
5 changed files with 135 additions and 54 deletions
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52
include/stdarg.h
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@ -3,51 +3,19 @@
#ifdef __x86_64__
#ifndef _WIN64
#include <stdlib.h>
/* 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;
};
typedef void *va_list;
typedef struct __va_list_struct *va_list;
va_list __va_start(void *fp);
void *__va_arg(va_list ap, int arg_type, int size);
va_list __va_copy(va_list src);
void __va_end(va_list ap);
/* we use __builtin_(malloc|free) to avoid #define malloc tcc_malloc */
/* XXX: this lacks the support of aggregated types. */
#define va_start(ap, last) \
(ap = (va_list)__builtin_malloc(sizeof(struct __va_list_struct)), \
*ap = *(struct __va_list_struct*)( \
(char*)__builtin_frame_address(0) - 16), \
ap->overflow_arg_area = ((char *)__builtin_frame_address(0) + \
ap->overflow_offset), \
ap->reg_save_area = (char *)__builtin_frame_address(0) - 176 - 16 \
)
#define va_arg(ap, type) \
(*(type*)(__builtin_types_compatible_p(type, long double) \
? (ap->overflow_arg_area += 16, \
ap->overflow_arg_area - 16) \
: __builtin_types_compatible_p(type, double) \
? (ap->fp_offset < 128 + 48 \
? (ap->fp_offset += 16, \
ap->reg_save_area + ap->fp_offset - 16) \
: (ap->overflow_arg_area += 8, \
ap->overflow_arg_area - 8)) \
: (ap->gp_offset < 48 \
? (ap->gp_offset += 8, \
ap->reg_save_area + ap->gp_offset - 8) \
: (ap->overflow_arg_area += 8, \
ap->overflow_arg_area - 8)) \
))
#define va_copy(dest, src) \
((dest) = (va_list)malloc(sizeof(struct __va_list_struct)), \
*(dest) = *(src))
#define va_end(ap) __builtin_free(ap)
#define va_start(ap, last) ((ap) = __va_start(__builtin_frame_address(0)))
#define va_arg(ap, type) \
(*(type *)(__va_arg(ap, __builtin_va_arg_types(type), sizeof(type))));
#define va_copy(dest, src) ((dest) = __va_copy(src))
#define va_end(ap) __va_end(ap)
#else /* _WIN64 */
typedef char *va_list;