1 files changed, 67 insertions, 0 deletions

diff --git a/tinyc/include/stdarg.h b/tinyc/include/stdarg.h
new file mode 100644
index 000000000..86e556ca3
--- /dev/null
+++ b/tinyc/include/stdarg.h
@@ -0,0 +1,67 @@
+#ifndef _STDARG_H
+#define _STDARG_H
+
+#ifdef __x86_64__
+#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 struct __va_list_struct *va_list;
+
+/* 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)
+
+#else
+
+typedef char *va_list;
+
+/* only correct for i386 */
+#define va_start(ap,last) ap = ((char *)&(last)) + ((sizeof(last)+3)&~3)
+#define va_arg(ap,type) (ap += (sizeof(type)+3)&~3, *(type *)(ap - ((sizeof(type)+3)&~3)))
+#define va_copy(dest, src) (dest) = (src)
+#define va_end(ap)
+
+#endif
+
+/* fix a buggy dependency on GCC in libio.h */
+typedef va_list __gnuc_va_list;
+#define _VA_LIST_DEFINED
+
+#endif /* _STDARG_H */