[p5sagit/p5-mst-13.2.git] / scope.c

/*    scope.c
 *
 *    Copyright (c) 1991-1997, Larry Wall
 *
 *    You may distribute under the terms of either the GNU General Public
 *    License or the Artistic License, as specified in the README file.
 *
 */

/*
 * "For the fashion of Minas Tirith was such that it was built on seven
 * levels..."
 */

#include "EXTERN.h"
#include "perl.h"

SV**
stack_grow(SV **sp, SV **p, int n)
{
    dTHR;
#if defined(DEBUGGING) && !defined(USE_THREADS)
    static int growing = 0;
    if (growing++)
      abort();
#endif
    stack_sp = sp;
    av_extend(curstack, (p - stack_base) + (n) + 128);
#if defined(DEBUGGING) && !defined(USE_THREADS)
    growing--;
#endif
    return stack_sp;
}

I32
cxinc(void)
{
    dTHR;
    cxstack_max = cxstack_max * 3 / 2;
    Renew(cxstack, cxstack_max + 1, PERL_CONTEXT);	/* XXX should fix CXINC macro */
    return cxstack_ix + 1;
}

void
push_return(OP *retop)
{
    dTHR;
    if (retstack_ix == retstack_max) {
	retstack_max = retstack_max * 3 / 2;
	Renew(retstack, retstack_max, OP*);
    }
    retstack[retstack_ix++] = retop;
}

OP *
pop_return(void)
{
    dTHR;
    if (retstack_ix > 0)
	return retstack[--retstack_ix];
    else
	return Nullop;
}

void
push_scope(void)
{
    dTHR;
    if (scopestack_ix == scopestack_max) {
	scopestack_max = scopestack_max * 3 / 2;
	Renew(scopestack, scopestack_max, I32);
    }
    scopestack[scopestack_ix++] = savestack_ix;

}

void
pop_scope(void)
{
    dTHR;
    I32 oldsave = scopestack[--scopestack_ix];
    LEAVE_SCOPE(oldsave);
}

void
markstack_grow(void)
{
    dTHR;
    I32 oldmax = markstack_max - markstack;
    I32 newmax = oldmax * 3 / 2;

    Renew(markstack, newmax, I32);
    markstack_ptr = markstack + oldmax;
    markstack_max = markstack + newmax;
}

void
savestack_grow(void)
{
    dTHR;
    savestack_max = savestack_max * 3 / 2;
    Renew(savestack, savestack_max, ANY);
}

void
free_tmps(void)
{
    dTHR;
    /* XXX should tmps_floor live in cxstack? */
    I32 myfloor = tmps_floor;
    while (tmps_ix > myfloor) {      /* clean up after last statement */
	SV* sv = tmps_stack[tmps_ix];
	tmps_stack[tmps_ix--] = Nullsv;
	if (sv) {
#ifdef DEBUGGING
	    SvTEMP_off(sv);
#endif
	    SvREFCNT_dec(sv);		/* note, can modify tmps_ix!!! */
	}
    }
}

static SV *
save_scalar_at(SV **sptr)
{
    dTHR;
    register SV *sv;
    SV *osv = *sptr;

    sv = *sptr = NEWSV(0,0);
    if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
	sv_upgrade(sv, SvTYPE(osv));
	if (SvGMAGICAL(osv)) {
	    MAGIC* mg;
	    bool oldtainted = tainted;
	    mg_get(osv);
	    if (tainting && tainted && (mg = mg_find(osv, 't'))) {
		SAVESPTR(mg->mg_obj);
		mg->mg_obj = osv;
	    }
	    SvFLAGS(osv) |= (SvFLAGS(osv) &
		(SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
	    tainted = oldtainted;
	}
	SvMAGIC(sv) = SvMAGIC(osv);
	SvFLAGS(sv) |= SvMAGICAL(osv);
	localizing = 1;
	SvSETMAGIC(sv);
	localizing = 0;
    }
    return sv;
}

SV *
save_scalar(GV *gv)
{
    dTHR;
    SSCHECK(3);
    SSPUSHPTR(gv);
    SSPUSHPTR(GvSV(gv));
    SSPUSHINT(SAVEt_SV);
    return save_scalar_at(&GvSV(gv));
}

SV*
save_svref(SV **sptr)
{
    dTHR;
    SSCHECK(3);
    SSPUSHPTR(sptr);
    SSPUSHPTR(*sptr);
    SSPUSHINT(SAVEt_SVREF);
    return save_scalar_at(sptr);
}

void
save_gp(GV *gv, I32 empty)
{
    dTHR;
    SSCHECK(6);
    SSPUSHIV((IV)SvLEN(gv));
    SvLEN(gv) = 0; /* forget that anything was allocated here */
    SSPUSHIV((IV)SvCUR(gv));
    SSPUSHPTR(SvPVX(gv));
    SvPOK_off(gv);
    SSPUSHPTR(SvREFCNT_inc(gv));
    SSPUSHPTR(GvGP(gv));
    SSPUSHINT(SAVEt_GP);

    if (empty) {
	register GP *gp;
	Newz(602, gp, 1, GP);
	GvGP(gv) = gp_ref(gp);
	GvSV(gv) = NEWSV(72,0);
	GvLINE(gv) = curcop->cop_line;
	GvEGV(gv) = gv;
    }
    else {
	gp_ref(GvGP(gv));
	GvINTRO_on(gv);
    }
}

AV *
save_ary(GV *gv)
{
    dTHR;
    AV *oav, *av;

    SSCHECK(3);
    SSPUSHPTR(gv);
    SSPUSHPTR(oav = GvAVn(gv));
    SSPUSHINT(SAVEt_AV);

    GvAV(gv) = Null(AV*);
    av = GvAVn(gv);
    if (SvMAGIC(oav)) {
	SvMAGIC(av) = SvMAGIC(oav);
	SvFLAGS(av) |= SvMAGICAL(oav);
	SvMAGICAL_off(oav);
	SvMAGIC(oav) = 0;
	localizing = 1;
	SvSETMAGIC((SV*)av);
	localizing = 0;
    }
    return av;
}

HV *
save_hash(GV *gv)
{
    dTHR;
    HV *ohv, *hv;

    SSCHECK(3);
    SSPUSHPTR(gv);
    SSPUSHPTR(ohv = GvHVn(gv));
    SSPUSHINT(SAVEt_HV);

    GvHV(gv) = Null(HV*);
    hv = GvHVn(gv);
    if (SvMAGIC(ohv)) {
	SvMAGIC(hv) = SvMAGIC(ohv);
	SvFLAGS(hv) |= SvMAGICAL(ohv);
	SvMAGICAL_off(ohv);
	SvMAGIC(ohv) = 0;
	localizing = 1;
	SvSETMAGIC((SV*)hv);
	localizing = 0;
    }
    return hv;
}

void
save_item(register SV *item)
{
    dTHR;
    register SV *sv;

    SSCHECK(3);
    SSPUSHPTR(item);		/* remember the pointer */
    sv = NEWSV(0,0);
    sv_setsv(sv,item);
    SSPUSHPTR(sv);		/* remember the value */
    SSPUSHINT(SAVEt_ITEM);
}

void
save_int(int *intp)
{
    dTHR;
    SSCHECK(3);
    SSPUSHINT(*intp);
    SSPUSHPTR(intp);
    SSPUSHINT(SAVEt_INT);
}

void
save_long(long int *longp)
{
    dTHR;
    SSCHECK(3);
    SSPUSHLONG(*longp);
    SSPUSHPTR(longp);
    SSPUSHINT(SAVEt_LONG);
}

void
save_I32(I32 *intp)
{
    dTHR;
    SSCHECK(3);
    SSPUSHINT(*intp);
    SSPUSHPTR(intp);
    SSPUSHINT(SAVEt_I32);
}

void
save_I16(I16 *intp)
{
    dTHR;
    SSCHECK(3);
    SSPUSHINT(*intp);
    SSPUSHPTR(intp);
    SSPUSHINT(SAVEt_I16);
}

void
save_iv(IV *ivp)
{
    dTHR;
    SSCHECK(3);
    SSPUSHIV(*ivp);
    SSPUSHPTR(ivp);
    SSPUSHINT(SAVEt_IV);
}

/* Cannot use save_sptr() to store a char* since the SV** cast will
 * force word-alignment and we'll miss the pointer.
 */
void
save_pptr(char **pptr)
{
    dTHR;
    SSCHECK(3);
    SSPUSHPTR(*pptr);
    SSPUSHPTR(pptr);
    SSPUSHINT(SAVEt_PPTR);
}

void
save_sptr(SV **sptr)
{
    dTHR;
    SSCHECK(3);
    SSPUSHPTR(*sptr);
    SSPUSHPTR(sptr);
    SSPUSHINT(SAVEt_SPTR);
}

SV **
save_threadsv(PADOFFSET i)
{
#ifdef USE_THREADS
    dTHR;
    SV **svp = av_fetch(thr->threadsv, i, FALSE);
    DEBUG_L(PerlIO_printf(PerlIO_stderr(), "save_threadsv %u: %p %p:%s\n",
			  i, svp, *svp, SvPEEK(*svp)));
    save_svref(svp);
    return svp;
#else
    croak("panic: save_threadsv called in non-threaded perl");
    return 0;
#endif /* USE_THREADS */
}

void
save_nogv(GV *gv)
{
    dTHR;
    SSCHECK(2);
    SSPUSHPTR(gv);
    SSPUSHINT(SAVEt_NSTAB);
}

void
save_hptr(HV **hptr)
{
    dTHR;
    SSCHECK(3);
    SSPUSHPTR(*hptr);
    SSPUSHPTR(hptr);
    SSPUSHINT(SAVEt_HPTR);
}

void
save_aptr(AV **aptr)
{
    dTHR;
    SSCHECK(3);
    SSPUSHPTR(*aptr);
    SSPUSHPTR(aptr);
    SSPUSHINT(SAVEt_APTR);
}

void
save_freesv(SV *sv)
{
    dTHR;
    SSCHECK(2);
    SSPUSHPTR(sv);
    SSPUSHINT(SAVEt_FREESV);
}

void
save_freeop(OP *o)
{
    dTHR;
    SSCHECK(2);
    SSPUSHPTR(o);
    SSPUSHINT(SAVEt_FREEOP);
}

void
save_freepv(char *pv)
{
    dTHR;
    SSCHECK(2);
    SSPUSHPTR(pv);
    SSPUSHINT(SAVEt_FREEPV);
}

void
save_clearsv(SV **svp)
{
    dTHR;
    SSCHECK(2);
    SSPUSHLONG((long)(svp-curpad));
    SSPUSHINT(SAVEt_CLEARSV);
}

void
save_delete(HV *hv, char *key, I32 klen)
{
    dTHR;
    SSCHECK(4);
    SSPUSHINT(klen);
    SSPUSHPTR(key);
    SSPUSHPTR(hv);
    SSPUSHINT(SAVEt_DELETE);
}

void
save_list(register SV **sarg, I32 maxsarg)
{
    dTHR;
    register SV *sv;
    register I32 i;

    SSCHECK(3 * maxsarg);
    for (i = 1; i <= maxsarg; i++) {
	SSPUSHPTR(sarg[i]);		/* remember the pointer */
	sv = NEWSV(0,0);
	sv_setsv(sv,sarg[i]);
	SSPUSHPTR(sv);			/* remember the value */
	SSPUSHINT(SAVEt_ITEM);
    }
}

void
save_destructor(void (*f) (void *), void *p)
{
    dTHR;
    SSCHECK(3);
    SSPUSHDPTR(f);
    SSPUSHPTR(p);
    SSPUSHINT(SAVEt_DESTRUCTOR);
}

void
save_op(void)
{
    dTHR;
    SSCHECK(2);
    SSPUSHPTR(op);
    SSPUSHINT(SAVEt_OP);
}

void
leave_scope(I32 base)
{
    dTHR;
    register SV *sv;
    register SV *value;
    register GV *gv;
    register AV *av;
    register HV *hv;
    register void* ptr;

    if (base < -1)
	croak("panic: corrupt saved stack index");
    while (savestack_ix > base) {
	switch (SSPOPINT) {
	case SAVEt_ITEM:			/* normal string */
	    value = (SV*)SSPOPPTR;
	    sv = (SV*)SSPOPPTR;
	    sv_replace(sv,value);
	    localizing = 2;
	    SvSETMAGIC(sv);
	    localizing = 0;
	    break;
        case SAVEt_SV:				/* scalar reference */
	    value = (SV*)SSPOPPTR;
	    gv = (GV*)SSPOPPTR;
	    ptr = &GvSV(gv);
	    goto restore_sv;
        case SAVEt_SVREF:			/* scalar reference */
	    value = (SV*)SSPOPPTR;
	    ptr = SSPOPPTR;
	restore_sv:
	    sv = *(SV**)ptr;
	    DEBUG_L(PerlIO_printf(PerlIO_stderr(),
				  "restore svref: %p %p:%s -> %p:%s\n",
			  	  ptr, sv, SvPEEK(sv), value, SvPEEK(value)));
	    if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
		SvTYPE(sv) != SVt_PVGV)
	    {
		(void)SvUPGRADE(value, SvTYPE(sv));
		SvMAGIC(value) = SvMAGIC(sv);
		SvFLAGS(value) |= SvMAGICAL(sv);
		SvMAGICAL_off(sv);
		SvMAGIC(sv) = 0;
	    }
	    else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
		     SvTYPE(value) != SVt_PVGV)
	    {
		SvFLAGS(value) |= (SvFLAGS(value) &
				   (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
		SvMAGICAL_off(value);
		SvMAGIC(value) = 0;
	    }
            SvREFCNT_dec(sv);
	    *(SV**)ptr = value;
	    localizing = 2;
	    SvSETMAGIC(value);
	    localizing = 0;
            break;
        case SAVEt_AV:				/* array reference */
	    av = (AV*)SSPOPPTR;
	    gv = (GV*)SSPOPPTR;
	    if (GvAV(gv)) {
		AV *goner = GvAV(gv);
		SvMAGIC(av) = SvMAGIC(goner);
		SvFLAGS(av) |= SvMAGICAL(goner);
		SvMAGICAL_off(goner);
		SvMAGIC(goner) = 0;
		SvREFCNT_dec(goner);
	    }
            GvAV(gv) = av;
	    if (SvMAGICAL(av)) {
		localizing = 2;
		SvSETMAGIC((SV*)av);
		localizing = 0;
	    }
            break;
        case SAVEt_HV:				/* hash reference */
	    hv = (HV*)SSPOPPTR;
	    gv = (GV*)SSPOPPTR;
	    if (GvHV(gv)) {
		HV *goner = GvHV(gv);
		SvMAGIC(hv) = SvMAGIC(goner);
		SvFLAGS(hv) |= SvMAGICAL(goner);
		SvMAGICAL_off(goner);
		SvMAGIC(goner) = 0;
		SvREFCNT_dec(goner);
	    }
            GvHV(gv) = hv;
	    if (SvMAGICAL(hv)) {
		localizing = 2;
		SvSETMAGIC((SV*)hv);
		localizing = 0;
	    }
            break;
	case SAVEt_INT:				/* int reference */
	    ptr = SSPOPPTR;
	    *(int*)ptr = (int)SSPOPINT;
	    break;
	case SAVEt_LONG:			/* long reference */
	    ptr = SSPOPPTR;
	    *(long*)ptr = (long)SSPOPLONG;
	    break;
	case SAVEt_I32:				/* I32 reference */
	    ptr = SSPOPPTR;
	    *(I32*)ptr = (I32)SSPOPINT;
	    break;
	case SAVEt_I16:				/* I16 reference */
	    ptr = SSPOPPTR;
	    *(I16*)ptr = (I16)SSPOPINT;
	    break;
	case SAVEt_IV:				/* IV reference */
	    ptr = SSPOPPTR;
	    *(IV*)ptr = (IV)SSPOPIV;
	    break;
	case SAVEt_SPTR:			/* SV* reference */
	    ptr = SSPOPPTR;
	    *(SV**)ptr = (SV*)SSPOPPTR;
	    break;
	case SAVEt_PPTR:			/* char* reference */
	    ptr = SSPOPPTR;
	    *(char**)ptr = (char*)SSPOPPTR;
	    break;
	case SAVEt_HPTR:			/* HV* reference */
	    ptr = SSPOPPTR;
	    *(HV**)ptr = (HV*)SSPOPPTR;
	    break;
	case SAVEt_APTR:			/* AV* reference */
	    ptr = SSPOPPTR;
	    *(AV**)ptr = (AV*)SSPOPPTR;
	    break;
	case SAVEt_NSTAB:
	    gv = (GV*)SSPOPPTR;
	    (void)sv_clear((SV*)gv);
	    break;
	case SAVEt_GP:				/* scalar reference */
	    ptr = SSPOPPTR;
	    gv = (GV*)SSPOPPTR;
            gp_free(gv);
            GvGP(gv) = (GP*)ptr;
            if (SvPOK(gv) && SvLEN(gv) > 0) {
                Safefree(SvPVX(gv));
            }
            SvPVX(gv) = (char *)SSPOPPTR;
            SvCUR(gv) = (STRLEN)SSPOPIV;
            SvLEN(gv) = (STRLEN)SSPOPIV;
	    SvREFCNT_dec(gv);
            break;
	case SAVEt_FREESV:
	    ptr = SSPOPPTR;
	    SvREFCNT_dec((SV*)ptr);
	    break;
	case SAVEt_FREEOP:
	    ptr = SSPOPPTR;
	    if (comppad)
		curpad = AvARRAY(comppad);
	    op_free((OP*)ptr);
	    break;
	case SAVEt_FREEPV:
	    ptr = SSPOPPTR;
	    Safefree((char*)ptr);
	    break;
	case SAVEt_CLEARSV:
	    ptr = (void*)&curpad[SSPOPLONG];
	    sv = *(SV**)ptr;
	    /* Can clear pad variable in place? */
	    if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
		if (SvTHINKFIRST(sv)) {
		    if (SvREADONLY(sv))
			croak("panic: leave_scope clearsv");
		    if (SvROK(sv))
			sv_unref(sv);
		}
		if (SvMAGICAL(sv))
		    mg_free(sv);

		switch (SvTYPE(sv)) {
		case SVt_NULL:
		    break;
		case SVt_PVAV:
		    av_clear((AV*)sv);
		    break;
		case SVt_PVHV:
		    hv_clear((HV*)sv);
		    break;
		case SVt_PVCV:
		    croak("panic: leave_scope pad code");
		case SVt_RV:
		case SVt_IV:
		case SVt_NV:
		    (void)SvOK_off(sv);
		    break;
		default:
		    (void)SvOK_off(sv);
		    (void)SvOOK_off(sv);
		    break;
		}
	    }
	    else {	/* Someone has a claim on this, so abandon it. */
		U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY|SVs_PADMY|SVs_PADTMP);
		switch (SvTYPE(sv)) {	/* Console ourselves with a new value */
		case SVt_PVAV:	*(SV**)ptr = (SV*)newAV();	break;
		case SVt_PVHV:	*(SV**)ptr = (SV*)newHV();	break;
		default:	*(SV**)ptr = NEWSV(0,0);	break;
		}
		SvREFCNT_dec(sv);	/* Cast current value to the winds. */
		SvFLAGS(*(SV**)ptr) |= padflags; /* preserve pad nature */
	    }
	    break;
	case SAVEt_DELETE:
	    ptr = SSPOPPTR;
	    hv = (HV*)ptr;
	    ptr = SSPOPPTR;
	    (void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
	    Safefree(ptr);
	    break;
	case SAVEt_DESTRUCTOR:
	    ptr = SSPOPPTR;
	    (*SSPOPDPTR)(ptr);
	    break;
	case SAVEt_REGCONTEXT:
	    {
		I32 delta = SSPOPINT;
		savestack_ix -= delta;	/* regexp must have croaked */
	    }
	    break;
	case SAVEt_STACK_POS:		/* Position on Perl stack */
	    {
		I32 delta = SSPOPINT;
		stack_sp = stack_base + delta;
	    }
	    break;
	case SAVEt_OP:
	    op = (OP*)SSPOPPTR;
	    break;
	default:
	    croak("panic: leave_scope inconsistency");
	}
    }
}

#ifdef DEBUGGING

void
cx_dump(PERL_CONTEXT *cx)
{
    dTHR;
    PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), block_type[cx->cx_type]);
    if (cx->cx_type != CXt_SUBST) {
	PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
	PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
	PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
	PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
	PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
	PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
	PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
    }
    switch (cx->cx_type) {
    case CXt_NULL:
    case CXt_BLOCK:
	break;
    case CXt_SUB:
	PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%lx\n",
		(long)cx->blk_sub.cv);
	PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%lx\n",
		(long)cx->blk_sub.gv);
	PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%lx\n",
		(long)cx->blk_sub.dfoutgv);
	PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
		(long)cx->blk_sub.olddepth);
	PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
		(int)cx->blk_sub.hasargs);
	break;
    case CXt_EVAL:
	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
		(long)cx->blk_eval.old_in_eval);
	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
		op_name[cx->blk_eval.old_op_type],
		op_desc[cx->blk_eval.old_op_type]);
	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
		cx->blk_eval.old_name);
	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
		(long)cx->blk_eval.old_eval_root);
	break;

    case CXt_LOOP:
	PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
		cx->blk_loop.label);
	PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
		(long)cx->blk_loop.resetsp);
	PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%lx\n",
		(long)cx->blk_loop.redo_op);
	PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%lx\n",
		(long)cx->blk_loop.next_op);
	PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%lx\n",
		(long)cx->blk_loop.last_op);
	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
		(long)cx->blk_loop.iterix);
	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%lx\n",
		(long)cx->blk_loop.iterary);
	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%lx\n",
		(long)cx->blk_loop.itervar);
	if (cx->blk_loop.itervar)
	    PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%lx\n",
		(long)cx->blk_loop.itersave);
	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%lx\n",
		(long)cx->blk_loop.iterlval);
	break;

    case CXt_SUBST:
	PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
		(long)cx->sb_iters);
	PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
		(long)cx->sb_maxiters);
	PerlIO_printf(Perl_debug_log, "SB_SAFEBASE = %ld\n",
		(long)cx->sb_safebase);
	PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
		(long)cx->sb_once);
	PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
		cx->sb_orig);
	PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%lx\n",
		(long)cx->sb_dstr);
	PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%lx\n",
		(long)cx->sb_targ);
	PerlIO_printf(Perl_debug_log, "SB_S = 0x%lx\n",
		(long)cx->sb_s);
	PerlIO_printf(Perl_debug_log, "SB_M = 0x%lx\n",
		(long)cx->sb_m);
	PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%lx\n",
		(long)cx->sb_strend);
	PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%lx\n",
		(long)cx->sb_rxres);
	break;
    }
}
#endif
Commit	Line	Data
a0d0e21e	1	/* scope.c
79072805	2	*
9607fc9c	3	* Copyright (c) 1991-1997, Larry Wall
79072805	4	*
	5	* You may distribute under the terms of either the GNU General Public
	6	* License or the Artistic License, as specified in the README file.
	7	*
a0d0e21e	8	*/
	9
	10	/*
	11	* "For the fashion of Minas Tirith was such that it was built on seven
	12	* levels..."
79072805	13	*/
	14
	15	#include "EXTERN.h"
	16	#include "perl.h"
	17
a0d0e21e	18	SV**
8ac85365	19	stack_grow(SV sp, SV p, int n)
a0d0e21e	20	{
11343788	21	dTHR;
a60c0954	22	#if defined(DEBUGGING) && !defined(USE_THREADS)
	23	static int growing = 0;
	24	if (growing++)
	25	abort();
	26	#endif
a0d0e21e	27	stack_sp = sp;
1f96a9ed	28	av_extend(curstack, (p - stack_base) + (n) + 128);
a60c0954	29	#if defined(DEBUGGING) && !defined(USE_THREADS)
	30	growing--;
	31	#endif
a0d0e21e	32	return stack_sp;
	33	}
	34
79072805	35	I32
8ac85365	36	cxinc(void)
79072805	37	{
11343788	38	dTHR;
79072805	39	cxstack_max = cxstack_max * 3 / 2;
c09156bb	40	Renew(cxstack, cxstack_max + 1, PERL_CONTEXT); /* XXX should fix CXINC macro */
79072805	41	return cxstack_ix + 1;
	42	}
	43
	44	void
8ac85365	45	push_return(OP *retop)
79072805	46	{
11343788	47	dTHR;
79072805	48	if (retstack_ix == retstack_max) {
	49	retstack_max = retstack_max * 3 / 2;
	50	Renew(retstack, retstack_max, OP*);
	51	}
	52	retstack[retstack_ix++] = retop;
	53	}
	54
	55	OP *
8ac85365	56	pop_return(void)
79072805	57	{
11343788	58	dTHR;
79072805	59	if (retstack_ix > 0)
	60	return retstack[--retstack_ix];
	61	else
	62	return Nullop;
	63	}
	64
	65	void
8ac85365	66	push_scope(void)
79072805	67	{
11343788	68	dTHR;
79072805	69	if (scopestack_ix == scopestack_max) {
	70	scopestack_max = scopestack_max * 3 / 2;
	71	Renew(scopestack, scopestack_max, I32);
	72	}
	73	scopestack[scopestack_ix++] = savestack_ix;
	74
	75	}
	76
	77	void
8ac85365	78	pop_scope(void)
79072805	79	{
11343788	80	dTHR;
79072805	81	I32 oldsave = scopestack[--scopestack_ix];
8990e307	82	LEAVE_SCOPE(oldsave);
79072805	83	}
	84
	85	void
8ac85365	86	markstack_grow(void)
a0d0e21e	87	{
11343788	88	dTHR;
a0d0e21e	89	I32 oldmax = markstack_max - markstack;
	90	I32 newmax = oldmax * 3 / 2;
	91
	92	Renew(markstack, newmax, I32);
	93	markstack_ptr = markstack + oldmax;
	94	markstack_max = markstack + newmax;
	95	}
	96
	97	void
8ac85365	98	savestack_grow(void)
79072805	99	{
11343788	100	dTHR;
79072805	101	savestack_max = savestack_max * 3 / 2;
	102	Renew(savestack, savestack_max, ANY);
	103	}
	104
	105	void
8ac85365	106	free_tmps(void)
79072805	107	{
11343788	108	dTHR;
79072805	109	/* XXX should tmps_floor live in cxstack? */
	110	I32 myfloor = tmps_floor;
	111	while (tmps_ix > myfloor) { /* clean up after last statement */
	112	SV* sv = tmps_stack[tmps_ix];
	113	tmps_stack[tmps_ix--] = Nullsv;
463ee0b2	114	if (sv) {
	115	#ifdef DEBUGGING
	116	SvTEMP_off(sv);
	117	#endif
8990e307	118	SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
463ee0b2	119	}
79072805	120	}
	121	}
	122
7a4c00b4	123	static SV *
8ac85365	124	save_scalar_at(SV **sptr)
79072805	125	{
11343788	126	dTHR;
79072805	127	register SV *sv;
7a4c00b4	128	SV osv = sptr;
79072805	129
7a4c00b4	130	sv = *sptr = NEWSV(0,0);
a0d0e21e	131	if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
79072805	132	sv_upgrade(sv, SvTYPE(osv));
a0d0e21e	133	if (SvGMAGICAL(osv)) {
748a9306	134	MAGIC* mg;
748a9306	135	bool oldtainted = tainted;
a0d0e21e	136	mg_get(osv);
748a9306	137	if (tainting && tainted && (mg = mg_find(osv, 't'))) {
	138	SAVESPTR(mg->mg_obj);
	139	mg->mg_obj = osv;
	140	}
a0d0e21e	141	SvFLAGS(osv) \|= (SvFLAGS(osv) &
a0d0e21e	142	(SVp_IOK\|SVp_NOK\|SVp_POK)) >> PRIVSHIFT;
748a9306	143	tainted = oldtainted;
a0d0e21e	144	}
79072805	145	SvMAGIC(sv) = SvMAGIC(osv);
a0d0e21e	146	SvFLAGS(sv) \|= SvMAGICAL(osv);
748a9306	147	localizing = 1;
79072805	148	SvSETMAGIC(sv);
748a9306	149	localizing = 0;
79072805	150	}
	151	return sv;
	152	}
	153
7a4c00b4	154	SV *
8ac85365	155	save_scalar(GV *gv)
7a4c00b4	156	{
11343788	157	dTHR;
7a4c00b4	158	SSCHECK(3);
	159	SSPUSHPTR(gv);
	160	SSPUSHPTR(GvSV(gv));
	161	SSPUSHINT(SAVEt_SV);
	162	return save_scalar_at(&GvSV(gv));
	163	}
	164
	165	SV*
8ac85365	166	save_svref(SV **sptr)
7a4c00b4	167	{
11343788	168	dTHR;
7a4c00b4	169	SSCHECK(3);
	170	SSPUSHPTR(sptr);
	171	SSPUSHPTR(*sptr);
	172	SSPUSHINT(SAVEt_SVREF);
	173	return save_scalar_at(sptr);
	174	}
	175
79072805	176	void
8ac85365	177	save_gp(GV *gv, I32 empty)
79072805	178	{
e858de61	179	dTHR;
fb73857a	180	SSCHECK(6);
	181	SSPUSHIV((IV)SvLEN(gv));
	182	SvLEN(gv) = 0; /* forget that anything was allocated here */
	183	SSPUSHIV((IV)SvCUR(gv));
	184	SSPUSHPTR(SvPVX(gv));
	185	SvPOK_off(gv);
4633a7c4	186	SSPUSHPTR(SvREFCNT_inc(gv));
5f05dabc	187	SSPUSHPTR(GvGP(gv));
79072805	188	SSPUSHINT(SAVEt_GP);
79072805	189
5f05dabc	190	if (empty) {
	191	register GP *gp;
	192	Newz(602, gp, 1, GP);
44a8e56a	193	GvGP(gv) = gp_ref(gp);
5f05dabc	194	GvSV(gv) = NEWSV(72,0);
	195	GvLINE(gv) = curcop->cop_line;
	196	GvEGV(gv) = gv;
	197	}
	198	else {
44a8e56a	199	gp_ref(GvGP(gv));
5f05dabc	200	GvINTRO_on(gv);
5f05dabc	201	}
79072805	202	}
79072805	203
79072805	204	AV *
8ac85365	205	save_ary(GV *gv)
79072805	206	{
11343788	207	dTHR;
fb73857a	208	AV oav, av;
fb73857a	209
79072805	210	SSCHECK(3);
79072805	211	SSPUSHPTR(gv);
fb73857a	212	SSPUSHPTR(oav = GvAVn(gv));
79072805	213	SSPUSHINT(SAVEt_AV);
	214
	215	GvAV(gv) = Null(AV*);
fb73857a	216	av = GvAVn(gv);
	217	if (SvMAGIC(oav)) {
	218	SvMAGIC(av) = SvMAGIC(oav);
	219	SvFLAGS(av) \|= SvMAGICAL(oav);
	220	SvMAGICAL_off(oav);
	221	SvMAGIC(oav) = 0;
	222	localizing = 1;
	223	SvSETMAGIC((SV*)av);
	224	localizing = 0;
	225	}
	226	return av;
79072805	227	}
	228
	229	HV *
8ac85365	230	save_hash(GV *gv)
79072805	231	{
11343788	232	dTHR;
fb73857a	233	HV ohv, hv;
fb73857a	234
79072805	235	SSCHECK(3);
79072805	236	SSPUSHPTR(gv);
fb73857a	237	SSPUSHPTR(ohv = GvHVn(gv));
79072805	238	SSPUSHINT(SAVEt_HV);
	239
	240	GvHV(gv) = Null(HV*);
fb73857a	241	hv = GvHVn(gv);
	242	if (SvMAGIC(ohv)) {
	243	SvMAGIC(hv) = SvMAGIC(ohv);
	244	SvFLAGS(hv) \|= SvMAGICAL(ohv);
	245	SvMAGICAL_off(ohv);
	246	SvMAGIC(ohv) = 0;
	247	localizing = 1;
	248	SvSETMAGIC((SV*)hv);
	249	localizing = 0;
	250	}
	251	return hv;
79072805	252	}
	253
	254	void
8ac85365	255	save_item(register SV *item)
79072805	256	{
11343788	257	dTHR;
79072805	258	register SV *sv;
	259
	260	SSCHECK(3);
	261	SSPUSHPTR(item); /* remember the pointer */
	262	sv = NEWSV(0,0);
	263	sv_setsv(sv,item);
	264	SSPUSHPTR(sv); /* remember the value */
	265	SSPUSHINT(SAVEt_ITEM);
	266	}
	267
	268	void
8ac85365	269	save_int(int *intp)
79072805	270	{
11343788	271	dTHR;
79072805	272	SSCHECK(3);
	273	SSPUSHINT(*intp);
	274	SSPUSHPTR(intp);
	275	SSPUSHINT(SAVEt_INT);
	276	}
	277
	278	void
8ac85365	279	save_long(long int *longp)
85e6fe83	280	{
11343788	281	dTHR;
85e6fe83	282	SSCHECK(3);
	283	SSPUSHLONG(*longp);
	284	SSPUSHPTR(longp);
	285	SSPUSHINT(SAVEt_LONG);
	286	}
	287
	288	void
8ac85365	289	save_I32(I32 *intp)
79072805	290	{
11343788	291	dTHR;
79072805	292	SSCHECK(3);
	293	SSPUSHINT(*intp);
	294	SSPUSHPTR(intp);
	295	SSPUSHINT(SAVEt_I32);
	296	}
	297
a0d0e21e	298	void
8ac85365	299	save_I16(I16 *intp)
55497cff	300	{
e858de61	301	dTHR;
55497cff	302	SSCHECK(3);
	303	SSPUSHINT(*intp);
	304	SSPUSHPTR(intp);
	305	SSPUSHINT(SAVEt_I16);
	306	}
	307
	308	void
8ac85365	309	save_iv(IV *ivp)
a0d0e21e	310	{
11343788	311	dTHR;
a0d0e21e	312	SSCHECK(3);
4aa0a1f7	313	SSPUSHIV(*ivp);
a0d0e21e	314	SSPUSHPTR(ivp);
	315	SSPUSHINT(SAVEt_IV);
	316	}
	317
85e6fe83	318	/* Cannot use save_sptr() to store a char* since the SV** cast will
	319	* force word-alignment and we'll miss the pointer.
	320	*/
	321	void
8ac85365	322	save_pptr(char **pptr)
85e6fe83	323	{
11343788	324	dTHR;
85e6fe83	325	SSCHECK(3);
	326	SSPUSHPTR(*pptr);
	327	SSPUSHPTR(pptr);
	328	SSPUSHINT(SAVEt_PPTR);
	329	}
	330
79072805	331	void
8ac85365	332	save_sptr(SV **sptr)
79072805	333	{
11343788	334	dTHR;
79072805	335	SSCHECK(3);
	336	SSPUSHPTR(*sptr);
	337	SSPUSHPTR(sptr);
	338	SSPUSHINT(SAVEt_SPTR);
	339	}
	340
54b9620d	341	SV **
	342	save_threadsv(PADOFFSET i)
	343	{
	344	#ifdef USE_THREADS
	345	dTHR;
	346	SV **svp = av_fetch(thr->threadsv, i, FALSE);
	347	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "save_threadsv %u: %p %p:%s\n",
	348	i, svp, svp, SvPEEK(svp)));
	349	save_svref(svp);
	350	return svp;
	351	#else
	352	croak("panic: save_threadsv called in non-threaded perl");
	353	return 0;
	354	#endif /* USE_THREADS */
	355	}
	356
79072805	357	void
8ac85365	358	save_nogv(GV *gv)
79072805	359	{
11343788	360	dTHR;
79072805	361	SSCHECK(2);
	362	SSPUSHPTR(gv);
	363	SSPUSHINT(SAVEt_NSTAB);
	364	}
	365
	366	void
8ac85365	367	save_hptr(HV **hptr)
79072805	368	{
11343788	369	dTHR;
79072805	370	SSCHECK(3);
85e6fe83	371	SSPUSHPTR(*hptr);
79072805	372	SSPUSHPTR(hptr);
	373	SSPUSHINT(SAVEt_HPTR);
	374	}
	375
	376	void
8ac85365	377	save_aptr(AV **aptr)
79072805	378	{
11343788	379	dTHR;
79072805	380	SSCHECK(3);
85e6fe83	381	SSPUSHPTR(*aptr);
79072805	382	SSPUSHPTR(aptr);
	383	SSPUSHINT(SAVEt_APTR);
	384	}
	385
	386	void
8ac85365	387	save_freesv(SV *sv)
8990e307	388	{
11343788	389	dTHR;
8990e307	390	SSCHECK(2);
	391	SSPUSHPTR(sv);
	392	SSPUSHINT(SAVEt_FREESV);
	393	}
	394
	395	void
8ac85365	396	save_freeop(OP *o)
8990e307	397	{
11343788	398	dTHR;
8990e307	399	SSCHECK(2);
11343788	400	SSPUSHPTR(o);
8990e307	401	SSPUSHINT(SAVEt_FREEOP);
	402	}
	403
	404	void
8ac85365	405	save_freepv(char *pv)
8990e307	406	{
11343788	407	dTHR;
8990e307	408	SSCHECK(2);
	409	SSPUSHPTR(pv);
	410	SSPUSHINT(SAVEt_FREEPV);
	411	}
	412
	413	void
8ac85365	414	save_clearsv(SV **svp)
8990e307	415	{
11343788	416	dTHR;
8990e307	417	SSCHECK(2);
4aa0a1f7	418	SSPUSHLONG((long)(svp-curpad));
8990e307	419	SSPUSHINT(SAVEt_CLEARSV);
	420	}
	421
	422	void
8ac85365	423	save_delete(HV hv, char key, I32 klen)
8990e307	424	{
11343788	425	dTHR;
8990e307	426	SSCHECK(4);
	427	SSPUSHINT(klen);
	428	SSPUSHPTR(key);
	429	SSPUSHPTR(hv);
	430	SSPUSHINT(SAVEt_DELETE);
	431	}
	432
	433	void
8ac85365	434	save_list(register SV **sarg, I32 maxsarg)
79072805	435	{
11343788	436	dTHR;
79072805	437	register SV *sv;
	438	register I32 i;
	439
	440	SSCHECK(3 * maxsarg);
	441	for (i = 1; i <= maxsarg; i++) {
	442	SSPUSHPTR(sarg[i]); /* remember the pointer */
	443	sv = NEWSV(0,0);
	444	sv_setsv(sv,sarg[i]);
	445	SSPUSHPTR(sv); /* remember the value */
	446	SSPUSHINT(SAVEt_ITEM);
	447	}
	448	}
	449
	450	void
8ac85365	451	save_destructor(void (f) (void ), void *p)
a0d0e21e	452	{
11343788	453	dTHR;
a0d0e21e	454	SSCHECK(3);
	455	SSPUSHDPTR(f);
	456	SSPUSHPTR(p);
	457	SSPUSHINT(SAVEt_DESTRUCTOR);
	458	}
	459
	460	void
8ac85365	461	save_op(void)
462e5cf6	462	{
	463	dTHR;
	464	SSCHECK(2);
	465	SSPUSHPTR(op);
	466	SSPUSHINT(SAVEt_OP);
	467	}
	468
	469	void
8ac85365	470	leave_scope(I32 base)
79072805	471	{
11343788	472	dTHR;
79072805	473	register SV *sv;
	474	register SV *value;
	475	register GV *gv;
	476	register AV *av;
	477	register HV *hv;
	478	register void* ptr;
	479
	480	if (base < -1)
463ee0b2	481	croak("panic: corrupt saved stack index");
79072805	482	while (savestack_ix > base) {
	483	switch (SSPOPINT) {
	484	case SAVEt_ITEM: /* normal string */
	485	value = (SV*)SSPOPPTR;
	486	sv = (SV*)SSPOPPTR;
	487	sv_replace(sv,value);
748a9306	488	localizing = 2;
79072805	489	SvSETMAGIC(sv);
748a9306	490	localizing = 0;
79072805	491	break;
	492	case SAVEt_SV: /* scalar reference */
	493	value = (SV*)SSPOPPTR;
	494	gv = (GV*)SSPOPPTR;
7a4c00b4	495	ptr = &GvSV(gv);
7a4c00b4	496	goto restore_sv;
79072805	497	case SAVEt_SVREF: /* scalar reference */
7a4c00b4	498	value = (SV*)SSPOPPTR;
79072805	499	ptr = SSPOPPTR;
7a4c00b4	500	restore_sv:
79072805	501	sv = (SV*)ptr;
54b9620d	502	DEBUG_L(PerlIO_printf(PerlIO_stderr(),
	503	"restore svref: %p %p:%s -> %p:%s\n",
	504	ptr, sv, SvPEEK(sv), value, SvPEEK(value)));
748a9306	505	if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
	506	SvTYPE(sv) != SVt_PVGV)
	507	{
a0d0e21e	508	(void)SvUPGRADE(value, SvTYPE(sv));
	509	SvMAGIC(value) = SvMAGIC(sv);
	510	SvFLAGS(value) \|= SvMAGICAL(sv);
	511	SvMAGICAL_off(sv);
79072805	512	SvMAGIC(sv) = 0;
a0d0e21e	513	}
7a4c00b4	514	else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
	515	SvTYPE(value) != SVt_PVGV)
	516	{
	517	SvFLAGS(value) \|= (SvFLAGS(value) &
	518	(SVp_IOK\|SVp_NOK\|SVp_POK)) >> PRIVSHIFT;
	519	SvMAGICAL_off(value);
	520	SvMAGIC(value) = 0;
	521	}
8990e307	522	SvREFCNT_dec(sv);
a0d0e21e	523	(SV*)ptr = value;
748a9306	524	localizing = 2;
a0d0e21e	525	SvSETMAGIC(value);
748a9306	526	localizing = 0;
79072805	527	break;
	528	case SAVEt_AV: /* array reference */
	529	av = (AV*)SSPOPPTR;
	530	gv = (GV*)SSPOPPTR;
fb73857a	531	if (GvAV(gv)) {
	532	AV *goner = GvAV(gv);
	533	SvMAGIC(av) = SvMAGIC(goner);
	534	SvFLAGS(av) \|= SvMAGICAL(goner);
	535	SvMAGICAL_off(goner);
	536	SvMAGIC(goner) = 0;
	537	SvREFCNT_dec(goner);
	538	}
79072805	539	GvAV(gv) = av;
fb73857a	540	if (SvMAGICAL(av)) {
	541	localizing = 2;
	542	SvSETMAGIC((SV*)av);
	543	localizing = 0;
	544	}
79072805	545	break;
	546	case SAVEt_HV: /* hash reference */
	547	hv = (HV*)SSPOPPTR;
	548	gv = (GV*)SSPOPPTR;
fb73857a	549	if (GvHV(gv)) {
	550	HV *goner = GvHV(gv);
	551	SvMAGIC(hv) = SvMAGIC(goner);
	552	SvFLAGS(hv) \|= SvMAGICAL(goner);
	553	SvMAGICAL_off(goner);
	554	SvMAGIC(goner) = 0;
	555	SvREFCNT_dec(goner);
	556	}
79072805	557	GvHV(gv) = hv;
fb73857a	558	if (SvMAGICAL(hv)) {
	559	localizing = 2;
	560	SvSETMAGIC((SV*)hv);
	561	localizing = 0;
	562	}
79072805	563	break;
	564	case SAVEt_INT: /* int reference */
	565	ptr = SSPOPPTR;
	566	(int)ptr = (int)SSPOPINT;
	567	break;
85e6fe83	568	case SAVEt_LONG: /* long reference */
	569	ptr = SSPOPPTR;
	570	(long)ptr = (long)SSPOPLONG;
	571	break;
79072805	572	case SAVEt_I32: /* I32 reference */
	573	ptr = SSPOPPTR;
	574	(I32)ptr = (I32)SSPOPINT;
	575	break;
55497cff	576	case SAVEt_I16: /* I16 reference */
	577	ptr = SSPOPPTR;
	578	(I16)ptr = (I16)SSPOPINT;
	579	break;
a0d0e21e	580	case SAVEt_IV: /* IV reference */
	581	ptr = SSPOPPTR;
	582	(IV)ptr = (IV)SSPOPIV;
	583	break;
79072805	584	case SAVEt_SPTR: /* SV* reference */
	585	ptr = SSPOPPTR;
	586	(SV)ptr = (SV)SSPOPPTR;
	587	break;
85e6fe83	588	case SAVEt_PPTR: /* char* reference */
	589	ptr = SSPOPPTR;
	590	(char)ptr = (char)SSPOPPTR;
	591	break;
79072805	592	case SAVEt_HPTR: /* HV* reference */
	593	ptr = SSPOPPTR;
	594	(HV)ptr = (HV)SSPOPPTR;
	595	break;
	596	case SAVEt_APTR: /* AV* reference */
	597	ptr = SSPOPPTR;
	598	(AV)ptr = (AV)SSPOPPTR;
	599	break;
	600	case SAVEt_NSTAB:
	601	gv = (GV*)SSPOPPTR;
1f96a9ed	602	(void)sv_clear((SV*)gv);
79072805	603	break;
fb73857a	604	case SAVEt_GP: /* scalar reference */
79072805	605	ptr = SSPOPPTR;
	606	gv = (GV*)SSPOPPTR;
	607	gp_free(gv);
	608	GvGP(gv) = (GP*)ptr;
fb73857a	609	if (SvPOK(gv) && SvLEN(gv) > 0) {
	610	Safefree(SvPVX(gv));
	611	}
	612	SvPVX(gv) = (char *)SSPOPPTR;
	613	SvCUR(gv) = (STRLEN)SSPOPIV;
	614	SvLEN(gv) = (STRLEN)SSPOPIV;
4633a7c4	615	SvREFCNT_dec(gv);
79072805	616	break;
8990e307	617	case SAVEt_FREESV:
	618	ptr = SSPOPPTR;
	619	SvREFCNT_dec((SV*)ptr);
	620	break;
	621	case SAVEt_FREEOP:
	622	ptr = SSPOPPTR;
46fc3d4c	623	if (comppad)
46fc3d4c	624	curpad = AvARRAY(comppad);
8990e307	625	op_free((OP*)ptr);
	626	break;
	627	case SAVEt_FREEPV:
	628	ptr = SSPOPPTR;
	629	Safefree((char*)ptr);
	630	break;
	631	case SAVEt_CLEARSV:
4aa0a1f7	632	ptr = (void*)&curpad[SSPOPLONG];
8990e307	633	sv = (SV*)ptr;
bc44cdaf	634	/* Can clear pad variable in place? */
bc44cdaf	635	if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
8990e307	636	if (SvTHINKFIRST(sv)) {
	637	if (SvREADONLY(sv))
	638	croak("panic: leave_scope clearsv");
	639	if (SvROK(sv))
	640	sv_unref(sv);
	641	}
a0d0e21e	642	if (SvMAGICAL(sv))
a0d0e21e	643	mg_free(sv);
8990e307	644
	645	switch (SvTYPE(sv)) {
	646	case SVt_NULL:
	647	break;
	648	case SVt_PVAV:
44a8e56a	649	av_clear((AV*)sv);
8990e307	650	break;
8990e307	651	case SVt_PVHV:
44a8e56a	652	hv_clear((HV*)sv);
8990e307	653	break;
8990e307	654	case SVt_PVCV:
5377b701	655	croak("panic: leave_scope pad code");
	656	case SVt_RV:
	657	case SVt_IV:
	658	case SVt_NV:
	659	(void)SvOK_off(sv);
8990e307	660	break;
8990e307	661	default:
a0d0e21e	662	(void)SvOK_off(sv);
5377b701	663	(void)SvOOK_off(sv);
8990e307	664	break;
	665	}
	666	}
	667	else { /* Someone has a claim on this, so abandon it. */
4aa0a1f7	668	U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY\|SVs_PADMY\|SVs_PADTMP);
8990e307	669	switch (SvTYPE(sv)) { /* Console ourselves with a new value */
	670	case SVt_PVAV: (SV)ptr = (SV)newAV(); break;
	671	case SVt_PVHV: (SV)ptr = (SV)newHV(); break;
	672	default: (SV*)ptr = NEWSV(0,0); break;
	673	}
53868620	674	SvREFCNT_dec(sv); /* Cast current value to the winds. */
4aa0a1f7	675	SvFLAGS((SV)ptr) \|= padflags; / preserve pad nature */
8990e307	676	}
	677	break;
	678	case SAVEt_DELETE:
	679	ptr = SSPOPPTR;
	680	hv = (HV*)ptr;
	681	ptr = SSPOPPTR;
748a9306	682	(void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
adbc6bb1	683	Safefree(ptr);
8990e307	684	break;
a0d0e21e	685	case SAVEt_DESTRUCTOR:
	686	ptr = SSPOPPTR;
	687	(*SSPOPDPTR)(ptr);
	688	break;
	689	case SAVEt_REGCONTEXT:
8e07c86e	690	{
	691	I32 delta = SSPOPINT;
	692	savestack_ix -= delta; /* regexp must have croaked */
	693	}
a0d0e21e	694	break;
55497cff	695	case SAVEt_STACK_POS: /* Position on Perl stack */
	696	{
	697	I32 delta = SSPOPINT;
	698	stack_sp = stack_base + delta;
	699	}
	700	break;
462e5cf6	701	case SAVEt_OP:
	702	op = (OP*)SSPOPPTR;
	703	break;
79072805	704	default:
463ee0b2	705	croak("panic: leave_scope inconsistency");
79072805	706	}
	707	}
	708	}
8990e307	709
8990e307	710	#ifdef DEBUGGING
1f96a9ed	711
8990e307	712	void
c09156bb	713	cx_dump(PERL_CONTEXT *cx)
8990e307	714	{
11343788	715	dTHR;
fb73857a	716	PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), block_type[cx->cx_type]);
8990e307	717	if (cx->cx_type != CXt_SUBST) {
760ac839	718	PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
	719	PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
	720	PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
	721	PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
	722	PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
	723	PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
	724	PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
8990e307	725	}
	726	switch (cx->cx_type) {
	727	case CXt_NULL:
	728	case CXt_BLOCK:
	729	break;
	730	case CXt_SUB:
760ac839	731	PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%lx\n",
8990e307	732	(long)cx->blk_sub.cv);
760ac839	733	PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%lx\n",
8990e307	734	(long)cx->blk_sub.gv);
760ac839	735	PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%lx\n",
8990e307	736	(long)cx->blk_sub.dfoutgv);
760ac839	737	PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
8990e307	738	(long)cx->blk_sub.olddepth);
760ac839	739	PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
8990e307	740	(int)cx->blk_sub.hasargs);
	741	break;
	742	case CXt_EVAL:
760ac839	743	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
8990e307	744	(long)cx->blk_eval.old_in_eval);
760ac839	745	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
c07a80fd	746	op_name[cx->blk_eval.old_op_type],
c07a80fd	747	op_desc[cx->blk_eval.old_op_type]);
760ac839	748	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
8990e307	749	cx->blk_eval.old_name);
760ac839	750	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
8990e307	751	(long)cx->blk_eval.old_eval_root);
	752	break;
	753
	754	case CXt_LOOP:
760ac839	755	PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
8990e307	756	cx->blk_loop.label);
760ac839	757	PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
8990e307	758	(long)cx->blk_loop.resetsp);
760ac839	759	PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%lx\n",
8990e307	760	(long)cx->blk_loop.redo_op);
760ac839	761	PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%lx\n",
8990e307	762	(long)cx->blk_loop.next_op);
760ac839	763	PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%lx\n",
8990e307	764	(long)cx->blk_loop.last_op);
760ac839	765	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
8990e307	766	(long)cx->blk_loop.iterix);
760ac839	767	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%lx\n",
8990e307	768	(long)cx->blk_loop.iterary);
760ac839	769	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%lx\n",
8990e307	770	(long)cx->blk_loop.itervar);
8990e307	771	if (cx->blk_loop.itervar)
760ac839	772	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%lx\n",
8990e307	773	(long)cx->blk_loop.itersave);
7a4c00b4	774	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%lx\n",
7a4c00b4	775	(long)cx->blk_loop.iterlval);
8990e307	776	break;
	777
	778	case CXt_SUBST:
760ac839	779	PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
8990e307	780	(long)cx->sb_iters);
760ac839	781	PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
8990e307	782	(long)cx->sb_maxiters);
760ac839	783	PerlIO_printf(Perl_debug_log, "SB_SAFEBASE = %ld\n",
8990e307	784	(long)cx->sb_safebase);
760ac839	785	PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
8990e307	786	(long)cx->sb_once);
760ac839	787	PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
8990e307	788	cx->sb_orig);
760ac839	789	PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%lx\n",
8990e307	790	(long)cx->sb_dstr);
760ac839	791	PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%lx\n",
8990e307	792	(long)cx->sb_targ);
760ac839	793	PerlIO_printf(Perl_debug_log, "SB_S = 0x%lx\n",
8990e307	794	(long)cx->sb_s);
760ac839	795	PerlIO_printf(Perl_debug_log, "SB_M = 0x%lx\n",
8990e307	796	(long)cx->sb_m);
760ac839	797	PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%lx\n",
8990e307	798	(long)cx->sb_strend);
c90c0ff4	799	PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%lx\n",
c90c0ff4	800	(long)cx->sb_rxres);
8990e307	801	break;
	802	}
	803	}
	804	#endif