xsub.h

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/*    XSUB.h
 *
 *    Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
 *    2003, 2004, 2005, 2006, 2007 by Larry Wall and others
 *
 *    You may distribute under the terms of either the GNU General Public
 *    License or the Artistic License, as specified in the README file.
 *
 */

#ifndef _INC_PERL_XSUB_H
#define _INC_PERL_XSUB_H 1

/* first, some documentation for xsubpp-generated items */

/*
=head1 Variables created by C<xsubpp> and C<xsubpp> internal functions

=for apidoc Amn|char*|CLASS
Variable which is setup by C<xsubpp> to indicate the 
class name for a C++ XS constructor.  This is always a C<char*>.  See C<THIS>.

=for apidoc Amn|(whatever)|RETVAL
Variable which is setup by C<xsubpp> to hold the return value for an 
XSUB. This is always the proper type for the XSUB. See 
L<perlxs/"The RETVAL Variable">.

=for apidoc Amn|(whatever)|THIS
Variable which is setup by C<xsubpp> to designate the object in a C++ 
XSUB.  This is always the proper type for the C++ object.  See C<CLASS> and 
L<perlxs/"Using XS With C++">.

=for apidoc Amn|I32|ax
Variable which is setup by C<xsubpp> to indicate the stack base offset,
used by the C<ST>, C<XSprePUSH> and C<XSRETURN> macros.  The C<dMARK> macro
must be called prior to setup the C<MARK> variable.

=for apidoc Amn|I32|items
Variable which is setup by C<xsubpp> to indicate the number of 
items on the stack.  See L<perlxs/"Variable-length Parameter Lists">.

=for apidoc Amn|I32|ix
Variable which is setup by C<xsubpp> to indicate which of an 
XSUB's aliases was used to invoke it.  See L<perlxs/"The ALIAS: Keyword">.

=for apidoc Am|SV*|ST|int ix
Used to access elements on the XSUB's stack.

=for apidoc AmU||XS
Macro to declare an XSUB and its C parameter list.  This is handled by
C<xsubpp>.

=for apidoc Ams||dAX
Sets up the C<ax> variable.
This is usually handled automatically by C<xsubpp> by calling C<dXSARGS>.

=for apidoc Ams||dAXMARK
Sets up the C<ax> variable and stack marker variable C<mark>.
This is usually handled automatically by C<xsubpp> by calling C<dXSARGS>.

=for apidoc Ams||dITEMS
Sets up the C<items> variable.
This is usually handled automatically by C<xsubpp> by calling C<dXSARGS>.

=for apidoc Ams||dXSARGS
Sets up stack and mark pointers for an XSUB, calling dSP and dMARK.
Sets up the C<ax> and C<items> variables by calling C<dAX> and C<dITEMS>.
This is usually handled automatically by C<xsubpp>.

=for apidoc Ams||dXSI32
Sets up the C<ix> variable for an XSUB which has aliases.  This is usually
handled automatically by C<xsubpp>.

=for apidoc Ams||dUNDERBAR
Sets up the C<padoff_du> variable for an XSUB that wishes to use
C<UNDERBAR>.

=for apidoc AmU||UNDERBAR
The SV* corresponding to the $_ variable. Works even if there
is a lexical $_ in scope.

=cut
*/

#ifndef PERL_UNUSED_ARG
#  if defined(lint) && defined(S_SPLINT_S) /* www.splint.org */
#    include <note.h>
#    define PERL_UNUSED_ARG(x) NOTE(ARGUNUSED(x))
#  else
#    define PERL_UNUSED_ARG(x) ((void)x)
#  endif
#endif
#ifndef PERL_UNUSED_VAR
#  define PERL_UNUSED_VAR(x) ((void)x)
#endif

#define ST(off) PL_stack_base[ax + (off)]

/* XSPROTO() is also used by SWIG like this:
 *
 *     typedef XSPROTO(SwigPerlWrapper);
 *     typedef SwigPerlWrapper *SwigPerlWrapperPtr;
 *
 * This code needs to be compilable under both C and C++.
 *
 * Don't forget to change the __attribute__unused__ version of XS()
 * below too if you change XSPROTO() here.
 */
#define XSPROTO(name) void name(pTHX_ CV* cv)

#undef XS
#if defined(__CYGWIN__) && defined(USE_DYNAMIC_LOADING)
#  define XS(name) __declspec(dllexport) XSPROTO(name)
#endif
#if defined(__SYMBIAN32__)
#  define XS(name) EXPORT_C XSPROTO(name)
#endif
#ifndef XS
#  if defined(HASATTRIBUTE_UNUSED) && !defined(__cplusplus)
#    define XS(name) void name(pTHX_ CV* cv __attribute__unused__)
#  else
#    ifdef __cplusplus
#      define XS(name) extern "C" XSPROTO(name)
#    else
#      define XS(name) XSPROTO(name)
#    endif
#  endif
#endif

#define dAX const I32 ax = (I32)(MARK - PL_stack_base + 1)

#define dAXMARK				\
	I32 ax = POPMARK;	\
	register SV **mark = PL_stack_base + ax++

#define dITEMS I32 items = (I32)(SP - MARK)

#if defined(lint) && defined(S_SPLINT_S) /* www.splint.org */
#  define dXSARGS \
	NOTE(ARGUNUSED(cv)) \
	dSP; dAXMARK; dITEMS
#else
#  define dXSARGS \
	dSP; dAXMARK; dITEMS
#endif

#define dXSTARG SV * const targ = ((PL_op->op_private & OPpENTERSUB_HASTARG) \
			     ? PAD_SV(PL_op->op_targ) : sv_newmortal())

/* Should be used before final PUSHi etc. if not in PPCODE section. */
#define XSprePUSH (sp = PL_stack_base + ax - 1)

#define XSANY CvXSUBANY(cv)

#define dXSI32 I32 ix = XSANY.any_i32

#ifdef __cplusplus
#  define XSINTERFACE_CVT(ret,name) ret (*name)(...)
#  define XSINTERFACE_CVT_ANON(ret) ret (*)(...)
#else
#  define XSINTERFACE_CVT(ret,name) ret (*name)()
#  define XSINTERFACE_CVT_ANON(ret) ret (*)()
#endif
#define dXSFUNCTION(ret)		XSINTERFACE_CVT(ret,XSFUNCTION)
#define XSINTERFACE_FUNC(ret,cv,f)     ((XSINTERFACE_CVT_ANON(ret))(f))
#define XSINTERFACE_FUNC_SET(cv,f)	\
		CvXSUBANY(cv).any_dxptr = (void (*) (pTHX_ void*))(f)

#define dUNDERBAR PADOFFSET padoff_du = find_rundefsvoffset()
#define UNDERBAR ((padoff_du == NOT_IN_PAD \
	    || PAD_COMPNAME_FLAGS_isOUR(padoff_du)) \
	? DEFSV : PAD_SVl(padoff_du))

/* Simple macros to put new mortal values onto the stack.   */
/* Typically used to return values from XS functions.       */

/*
=head1 Stack Manipulation Macros

=for apidoc Am|void|XST_mIV|int pos|IV iv
Place an integer into the specified position C<pos> on the stack.  The
value is stored in a new mortal SV.

=for apidoc Am|void|XST_mNV|int pos|NV nv
Place a double into the specified position C<pos> on the stack.  The value
is stored in a new mortal SV.

=for apidoc Am|void|XST_mPV|int pos|char* str
Place a copy of a string into the specified position C<pos> on the stack. 
The value is stored in a new mortal SV.

=for apidoc Am|void|XST_mNO|int pos
Place C<&PL_sv_no> into the specified position C<pos> on the
stack.

=for apidoc Am|void|XST_mYES|int pos
Place C<&PL_sv_yes> into the specified position C<pos> on the
stack.

=for apidoc Am|void|XST_mUNDEF|int pos
Place C<&PL_sv_undef> into the specified position C<pos> on the
stack.

=for apidoc Am|void|XSRETURN|int nitems
Return from XSUB, indicating number of items on the stack.  This is usually
handled by C<xsubpp>.

=for apidoc Am|void|XSRETURN_IV|IV iv
Return an integer from an XSUB immediately.  Uses C<XST_mIV>.

=for apidoc Am|void|XSRETURN_UV|IV uv
Return an integer from an XSUB immediately.  Uses C<XST_mUV>.

=for apidoc Am|void|XSRETURN_NV|NV nv
Return a double from an XSUB immediately.  Uses C<XST_mNV>.

=for apidoc Am|void|XSRETURN_PV|char* str
Return a copy of a string from an XSUB immediately.  Uses C<XST_mPV>.

=for apidoc Ams||XSRETURN_NO
Return C<&PL_sv_no> from an XSUB immediately.  Uses C<XST_mNO>.

=for apidoc Ams||XSRETURN_YES
Return C<&PL_sv_yes> from an XSUB immediately.  Uses C<XST_mYES>.

=for apidoc Ams||XSRETURN_UNDEF
Return C<&PL_sv_undef> from an XSUB immediately.  Uses C<XST_mUNDEF>.

=for apidoc Ams||XSRETURN_EMPTY
Return an empty list from an XSUB immediately.

=head1 Variables created by C<xsubpp> and C<xsubpp> internal functions

=for apidoc AmU||newXSproto|char* name|XSUBADDR_t f|char* filename|const char *proto
Used by C<xsubpp> to hook up XSUBs as Perl subs.  Adds Perl prototypes to
the subs.

=for apidoc AmU||XS_VERSION
The version identifier for an XS module.  This is usually
handled automatically by C<ExtUtils::MakeMaker>.  See C<XS_VERSION_BOOTCHECK>.

=for apidoc Ams||XS_VERSION_BOOTCHECK
Macro to verify that a PM module's $VERSION variable matches the XS
module's C<XS_VERSION> variable.  This is usually handled automatically by
C<xsubpp>.  See L<perlxs/"The VERSIONCHECK: Keyword">.

=head1 Simple Exception Handling Macros

=for apidoc Ams||dXCPT
Set up necessary local variables for exception handling.
See L<perlguts/"Exception Handling">.

=for apidoc AmU||XCPT_TRY_START
Starts a try block.  See L<perlguts/"Exception Handling">.

=for apidoc AmU||XCPT_TRY_END
Ends a try block.  See L<perlguts/"Exception Handling">.

=for apidoc AmU||XCPT_CATCH
Introduces a catch block.  See L<perlguts/"Exception Handling">.

=for apidoc Ams||XCPT_RETHROW
Rethrows a previously caught exception.  See L<perlguts/"Exception Handling">.

=cut
*/

#define XST_mIV(i,v)  (ST(i) = sv_2mortal(newSViv(v))  )
#define XST_mUV(i,v)  (ST(i) = sv_2mortal(newSVuv(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_mPVN(i,v,n)  (ST(i) = sv_2mortal(newSVpvn(v,n)))
#define XST_mNO(i)    (ST(i) = &PL_sv_no   )
#define XST_mYES(i)   (ST(i) = &PL_sv_yes  )
#define XST_mUNDEF(i) (ST(i) = &PL_sv_undef)

#define XSRETURN(off)					\
    STMT_START {					\
	const IV tmpXSoff = (off);			\
	PL_stack_sp = PL_stack_base + ax + (tmpXSoff - 1);	\
	return;						\
    } STMT_END

#define XSRETURN_IV(v) STMT_START { XST_mIV(0,v);  XSRETURN(1); } STMT_END
#define XSRETURN_UV(v) STMT_START { XST_mUV(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_PVN(v,n) STMT_START { XST_mPVN(0,v,n);  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)	newXS_flags(a,b,c,d,0)

#ifdef XS_VERSION
#  define XS_VERSION_BOOTCHECK \
    STMT_START {							\
	SV *_sv;							\
	const char *vn = NULL, *module = SvPV_nolen_const(ST(0));	\
	if (items >= 2)	 /* version supplied as bootstrap arg */	\
	    _sv = ST(1);						\
	else {								\
	    /* XXX GV_ADDWARN */					\
	    _sv = get_sv(Perl_form(aTHX_ "%s::%s", module,		\
				vn = "XS_VERSION"), FALSE);		\
	    if (!_sv || !SvOK(_sv))					\
		_sv = get_sv(Perl_form(aTHX_ "%s::%s", module,	\
				    vn = "VERSION"), FALSE);		\
	}								\
	if (_sv) {							\
	    SV *xssv = Perl_newSVpv(aTHX_ XS_VERSION, 0);		\
	    xssv = new_version(xssv);					\
	    if ( !sv_derived_from(_sv, "version") )			\
		_sv = new_version(_sv);				\
	    if ( vcmp(_sv,xssv) )					\
		Perl_croak(aTHX_ "%s object version %"SVf" does not match %s%s%s%s %"SVf,\
		      module, SVfARG(vstringify(xssv)),			\
		      vn ? "$" : "", vn ? module : "", vn ? "::" : "",	\
		      vn ? vn : "bootstrap parameter", SVfARG(vstringify(_sv)));\
	}                                                               \
    } STMT_END
#else
#  define XS_VERSION_BOOTCHECK
#endif

#ifdef NO_XSLOCKS
#  define dXCPT             dJMPENV; int rEtV = 0