-#define ST(s) stack_base[ax + s]
+#define ST(off) stack_base[ax + (off)]
+
+#ifdef CAN_PROTOTYPE
+#define XS(name) void name(CV* cv)
+#else
+#define XS(name) void name(cv) CV* cv;
+#endif
+
+#define dXSARGS \
+ dSP; dMARK; \
+ I32 ax = mark - stack_base + 1; \
+ I32 items = sp - mark
+
+#define XSANY CvXSUBANY(cv)
+
+#define dXSI32 I32 ix = XSANY.any_i32
+
+#define XSRETURN(off) stack_sp = stack_base + ax + ((off) - 1); return
+
+/* Simple macros to put new mortal values onto the stack. */
+/* Typically used to return values from XS functions. */
+#define XST_mIV(i,v) (ST(i) = sv_2mortal(newSViv(v)) )
+#define XST_mNV(i,v) (ST(i) = sv_2mortal(newSVnv(v)) )
+#define XST_mPV(i,v) (ST(i) = sv_2mortal(newSVpv(v,0)))
+#define XST_mNO(i) (ST(i) = &sv_no )
+#define XST_mYES(i) (ST(i) = &sv_yes )
+#define XST_mUNDEF(i) (ST(i) = &sv_undef)
+
+#define XSRETURN_IV(v) STMT_START { XST_mIV(0,v); XSRETURN(1); } STMT_END
+#define XSRETURN_NV(v) STMT_START { XST_mNV(0,v); XSRETURN(1); } STMT_END
+#define XSRETURN_PV(v) STMT_START { XST_mPV(0,v); XSRETURN(1); } STMT_END
+#define XSRETURN_NO STMT_START { XST_mNO(0); XSRETURN(1); } STMT_END
+#define XSRETURN_YES STMT_START { XST_mYES(0); XSRETURN(1); } STMT_END
+#define XSRETURN_UNDEF STMT_START { XST_mUNDEF(0); XSRETURN(1); } STMT_END
+#define XSRETURN_EMPTY STMT_START { XSRETURN(0); } STMT_END
+
+#define newXSproto(a,b,c,d) sv_setpv((SV*)newXS(a,b,c), d)
+
+#ifdef XS_VERSION
+# define XS_VERSION_BOOTCHECK \
+ STMT_START { \
+ char vn[255], *module = SvPV(ST(0),na); \
+ if (items >= 2) /* version supplied as bootstrap arg */ \
+ Sv = ST(1); \
+ else { \
+ sprintf(vn,"%s::XS_VERSION", module); \
+ Sv = perl_get_sv(vn, FALSE); /* XXX GV_ADDWARN */ \
+ if (!Sv || !SvOK(Sv)) { \
+ sprintf(vn,"%s::VERSION", module); \
+ Sv = perl_get_sv(vn, FALSE); /* XXX GV_ADDWARN */ \
+ } \
+ } \
+ if (Sv && (!SvOK(Sv) || strNE(XS_VERSION, SvPV(Sv, na)))) \
+ croak("%s object version %s does not match $%s %s", \
+ module, XS_VERSION, vn, SvPV(Sv, na)); \
+ } STMT_END
+#else
+# define XS_VERSION_BOOTCHECK
+#endif