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/* multicall.h (version 1.0)
*
* Implements a poor-man's MULTICALL interface for old versions
* of perl that don't offer a proper one. Intended to be compatible
* with 5.6.0 and later.
*
*/
#ifdef dMULTICALL
#define REAL_MULTICALL
#else
#undef REAL_MULTICALL
/* In versions of perl where MULTICALL is not defined (i.e. prior
* to 5.9.4), Perl_pad_push is not exported either. It also has
* an extra argument in older versions; certainly in the 5.8 series.
* So we redefine it here.
*/
#ifndef AVf_REIFY
# ifdef SVpav_REIFY
# define AVf_REIFY SVpav_REIFY
# else
# error Neither AVf_REIFY nor SVpav_REIFY is defined
# endif
#endif
#ifndef AvFLAGS
# define AvFLAGS SvFLAGS
#endif
static void
multicall_pad_push(pTHX_ AV *padlist, int depth)
{
if (depth <= AvFILLp(padlist))
return;
{
SV** const svp = AvARRAY(padlist);
AV* const newpad = newAV();
SV** const oldpad = AvARRAY(svp[depth-1]);
I32 ix = AvFILLp((AV*)svp[1]);
const I32 names_fill = AvFILLp((AV*)svp[0]);
SV** const names = AvARRAY(svp[0]);
AV *av;
for ( ;ix > 0; ix--) {
if (names_fill >= ix && names[ix] != &PL_sv_undef) {
const char sigil = SvPVX(names[ix])[0];
if ((SvFLAGS(names[ix]) & SVf_FAKE) || sigil == '&') {
/* outer lexical or anon code */
av_store(newpad, ix, SvREFCNT_inc(oldpad[ix]));
}
else { /* our own lexical */
SV *sv;
if (sigil == '@')
sv = (SV*)newAV();
else if (sigil == '%')
sv = (SV*)newHV();
else
sv = NEWSV(0, 0);
av_store(newpad, ix, sv);
SvPADMY_on(sv);
}
}
else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) {
av_store(newpad, ix, SvREFCNT_inc(oldpad[ix]));
}
else {
/* save temporaries on recursion? */
SV * const sv = NEWSV(0, 0);
av_store(newpad, ix, sv);
SvPADTMP_on(sv);
}
}
av = newAV();
av_extend(av, 0);
av_store(newpad, 0, (SV*)av);
AvFLAGS(av) = AVf_REIFY;
av_store(padlist, depth, (SV*)newpad);
AvFILLp(padlist) = depth;
}
}
#define dMULTICALL \
SV **newsp; /* set by POPBLOCK */ \
PERL_CONTEXT *cx; \
CV *multicall_cv; \
OP *multicall_cop; \
bool multicall_oldcatch; \
U8 hasargs = 0
/* Between 5.9.1 and 5.9.2 the retstack was removed, and the
return op is now stored on the cxstack. */
#define HAS_RETSTACK (\
PERL_REVISION < 5 || \
(PERL_REVISION == 5 && PERL_VERSION < 9) || \
(PERL_REVISION == 5 && PERL_VERSION == 9 && PERL_SUBVERSION < 2) \
)
/* PUSHSUB is defined so differently on different versions of perl
* that it's easier to define our own version than code for all the
* different possibilities.
*/
#if HAS_RETSTACK
# define PUSHSUB_RETSTACK(cx)
#else
# define PUSHSUB_RETSTACK(cx) cx->blk_sub.retop = Nullop;
#endif
#define MULTICALL_PUSHSUB(cx, the_cv) \
cx->blk_sub.cv = the_cv; \
cx->blk_sub.olddepth = CvDEPTH(the_cv); \
cx->blk_sub.hasargs = hasargs; \
cx->blk_sub.lval = PL_op->op_private & \
(OPpLVAL_INTRO|OPpENTERSUB_INARGS); \
PUSHSUB_RETSTACK(cx) \
if (!CvDEPTH(the_cv)) { \
(void)SvREFCNT_inc(the_cv); \
(void)SvREFCNT_inc(the_cv); \
SAVEFREESV(the_cv); \
}
#define PUSH_MULTICALL(the_cv) \
STMT_START { \
CV *_nOnclAshIngNamE_ = the_cv; \
AV* padlist = CvPADLIST(_nOnclAshIngNamE_); \
multicall_cv = _nOnclAshIngNamE_; \
ENTER; \
multicall_oldcatch = CATCH_GET; \
SAVESPTR(CvROOT(multicall_cv)->op_ppaddr); \
CvROOT(multicall_cv)->op_ppaddr = PL_ppaddr[OP_NULL]; \
SAVETMPS; SAVEVPTR(PL_op); \
CATCH_SET(TRUE); \
PUSHSTACKi(PERLSI_SORT); \
PUSHBLOCK(cx, CXt_SUB, PL_stack_sp); \
MULTICALL_PUSHSUB(cx, multicall_cv); \
if (++CvDEPTH(multicall_cv) >= 2) { \
PERL_STACK_OVERFLOW_CHECK(); \
multicall_pad_push(aTHX_ padlist, CvDEPTH(multicall_cv)); \
} \
SAVECOMPPAD(); \
PL_comppad = (AV*) (AvARRAY(padlist)[CvDEPTH(multicall_cv)]); \
PL_curpad = AvARRAY(PL_comppad); \
multicall_cop = CvSTART(multicall_cv); \
} STMT_END
#define MULTICALL \
STMT_START { \
PL_op = multicall_cop; \
CALLRUNOPS(aTHX); \
} STMT_END
#define POP_MULTICALL \
STMT_START { \
CvDEPTH(multicall_cv)--; \
LEAVESUB(multicall_cv); \
POPBLOCK(cx,PL_curpm); \
POPSTACK; \
CATCH_SET(multicall_oldcatch); \
LEAVE; \
SPAGAIN; \
} STMT_END
#endif
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