Permalink
Find file
Fetching contributors…
Cannot retrieve contributors at this time
98 lines (91 sloc) 2.8 KB
/* cdecl.h is generated when you run `perl Makefile.PL DECL=cdecl' */
#include "cdecl.h"
/*
* Convert Perl sub args to C args and pass them to (*func)().
* Special case with passing 3 words explicit.
*/
static int
cdecl3_pray(ax, items, func)
I32 ax; /* used by the ST() macro */
I32 items;
void *func;
{
#ifdef USE_THREADS
dTHR;
#endif
STRLEN arg_len;
char *arg_scalar, *arg_on_stack;
register int i;
void* d1, *d2, *d3;
d1 = d2 = d3 = NULL;
#if CDECL_ONE_BY_ONE
#if CDECL_REVERSE
for (i = DYNALIB_ARGSTART; i < items; i++) {
#else /* ! CDECL_REVERSE */
for (i = items - 1; i >= DYNALIB_ARGSTART; i--) {
#endif /* ! CDECL_REVERSE */
arg_scalar = SvPV(ST(i), arg_len);
arg_on_stack = alloca(arg_len);
Copy(arg_scalar, arg_on_stack, arg_len, char);
}
#else /* ! CDECL_ONE_BY_ONE */
STRLEN total_arg_len = 0;
for (i = items; i-- > 0; ) {
(void) SvPV(ST(i), arg_len);
/* CDECL_ARG_ALIGN=8 for amd64 */
total_arg_len += min(arg_len, CDECL_ARG_ALIGN);
}
arg_on_stack = (char *) alloca(total_arg_len);
arg_on_stack += CDECL_ADJUST;
#if CDECL_REVERSE
for (i = items - 1; i >= 0; i--) {
#else /* ! CDECL_REVERSE */
for (i = 0; i < items; i++) {
#endif /* ! CDECL_REVERSE */
arg_scalar = SvPV(ST(i), arg_len);
if (sizeof(void*) == 8 && arg_len < 8) {
/* amd64 aligns to 8, so zero the values of smaller args.
http://blogs.msdn.com/oldnewthing/archive/2004/01/14/58579.aspx
*/
memzero(arg_on_stack, 8);
}
Copy(arg_scalar, arg_on_stack, arg_len, char);
arg_on_stack += min(arg_len, CDECL_ARG_ALIGN);
}
#endif /* ! CDECL_ONE_BY_ONE */
if (CDECL_STACK_RESERVE == 3 && items > 2) {
arg_scalar = SvPV(ST(0), arg_len);
Copy(arg_scalar, &d1, arg_len, char);
arg_scalar = SvPV(ST(1), arg_len);
Copy(arg_scalar, &d2, arg_len, char);
arg_scalar = SvPV(ST(2), arg_len);
Copy(arg_scalar, &d3, arg_len, char);
return ((int (*)()) func)(d1,d2,d3);
}
else if (CDECL_STACK_RESERVE == 2 || items == 2) {
arg_scalar = SvPV(ST(0), arg_len);
Copy(arg_scalar, &d1, arg_len, char);
arg_scalar = SvPV(ST(1), arg_len);
Copy(arg_scalar, &d2, arg_len, char);
return ((int (*)()) func)(d1,d2);
}
else if (CDECL_STACK_RESERVE == 1 || items == 1) {
arg_scalar = SvPV(ST(0), arg_len);
Copy(arg_scalar, &d1, arg_len, char);
return ((int (*)()) func)(d1);
}
else if (items == 0) {
return ((int (*)()) func)();
}
else {
printf("invalid CDECL_STACK_RESERVE=%d\n", CDECL_STACK_RESERVE);
exit (1);
}
}
#if defined(__GNUC__) && __GNUC__ >= 3 && defined(__GNUC_MINOR__) && (__GNUC_MINOR__ >= 3)
#define cdecl3_CALL(func, type) \
(type)((*((int (*)()) cdecl3_pray))(ax,items,func))
#else
#define cdecl3_CALL(func, type) \
((*((type (*)()) cdecl3_pray))(ax,items,func))
#endif