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#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_mortalcopy(&sv_no);
#define XST_mYES(i) ST(i)=sv_mortalcopy(&sv_yes);
#define XST_mUNDEF(i) ST(i)=sv_newmortal();
#define XSRETURN_IV(v) XST_mIV(0,v); XSRETURN(1)
#define XSRETURN_NV(v) XST_mNV(0,v); XSRETURN(1)
#define XSRETURN_PV(v) XST_mPV(0,v); XSRETURN(1)
#define XSRETURN_NO XST_mNO(0); XSRETURN(1)
#define XSRETURN_YES XST_mYES(0); XSRETURN(1)
#define XSRETURN_UNDEF XST_mUNDEF(0); XSRETURN(1)
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