[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 = GvAVn(gv);
    AV *av;

    if (!AvREAL(oav) && AvREIFY(oav))
	av_reify(oav);
    SSCHECK(3);
    SSPUSHPTR(gv);
    SSPUSHPTR(oav);
    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 = NEWSV(0,0);

    sv_setsv(sv,item);
    SSCHECK(3);
    SSPUSHPTR(item);		/* remember the pointer */
    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 = &THREADSV(i);	/* XXX Change to save by offset */
    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;

    for (i = 1; i <= maxsarg; i++) {
	sv = NEWSV(0,0);
	sv_setsv(sv,sarg[i]);
	SSCHECK(3);
	SSPUSHPTR(sarg[i]);		/* remember the pointer */
	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;
            if (SvPOK(gv) && SvLEN(gv) > 0) {
                Safefree(SvPVX(gv));
            }
            SvPVX(gv) = (char *)SSPOPPTR;
            SvCUR(gv) = (STRLEN)SSPOPIV;
            SvLEN(gv) = (STRLEN)SSPOPIV;
            gp_free(gv);
            GvGP(gv) = (GP*)ptr;
	    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;
67a38de0	208	AV *oav = GvAVn(gv);
67a38de0	209	AV *av;
fb73857a	210
67a38de0	211	if (!AvREAL(oav) && AvREIFY(oav))
67a38de0	212	av_reify(oav);
79072805	213	SSCHECK(3);
79072805	214	SSPUSHPTR(gv);
67a38de0	215	SSPUSHPTR(oav);
79072805	216	SSPUSHINT(SAVEt_AV);
	217
	218	GvAV(gv) = Null(AV*);
fb73857a	219	av = GvAVn(gv);
	220	if (SvMAGIC(oav)) {
	221	SvMAGIC(av) = SvMAGIC(oav);
	222	SvFLAGS(av) \|= SvMAGICAL(oav);
	223	SvMAGICAL_off(oav);
	224	SvMAGIC(oav) = 0;
	225	localizing = 1;
	226	SvSETMAGIC((SV*)av);
	227	localizing = 0;
	228	}
	229	return av;
79072805	230	}
	231
	232	HV *
8ac85365	233	save_hash(GV *gv)
79072805	234	{
11343788	235	dTHR;
fb73857a	236	HV ohv, hv;
fb73857a	237
79072805	238	SSCHECK(3);
79072805	239	SSPUSHPTR(gv);
fb73857a	240	SSPUSHPTR(ohv = GvHVn(gv));
79072805	241	SSPUSHINT(SAVEt_HV);
	242
	243	GvHV(gv) = Null(HV*);
fb73857a	244	hv = GvHVn(gv);
	245	if (SvMAGIC(ohv)) {
	246	SvMAGIC(hv) = SvMAGIC(ohv);
	247	SvFLAGS(hv) \|= SvMAGICAL(ohv);
	248	SvMAGICAL_off(ohv);
	249	SvMAGIC(ohv) = 0;
	250	localizing = 1;
	251	SvSETMAGIC((SV*)hv);
	252	localizing = 0;
	253	}
	254	return hv;
79072805	255	}
	256
	257	void
8ac85365	258	save_item(register SV *item)
79072805	259	{
11343788	260	dTHR;
f46d017c	261	register SV *sv = NEWSV(0,0);
79072805	262
f46d017c	263	sv_setsv(sv,item);
79072805	264	SSCHECK(3);
79072805	265	SSPUSHPTR(item); /* remember the pointer */
79072805	266	SSPUSHPTR(sv); /* remember the value */
	267	SSPUSHINT(SAVEt_ITEM);
	268	}
	269
	270	void
8ac85365	271	save_int(int *intp)
79072805	272	{
11343788	273	dTHR;
79072805	274	SSCHECK(3);
	275	SSPUSHINT(*intp);
	276	SSPUSHPTR(intp);
	277	SSPUSHINT(SAVEt_INT);
	278	}
	279
	280	void
8ac85365	281	save_long(long int *longp)
85e6fe83	282	{
11343788	283	dTHR;
85e6fe83	284	SSCHECK(3);
	285	SSPUSHLONG(*longp);
	286	SSPUSHPTR(longp);
	287	SSPUSHINT(SAVEt_LONG);
	288	}
	289
	290	void
8ac85365	291	save_I32(I32 *intp)
79072805	292	{
11343788	293	dTHR;
79072805	294	SSCHECK(3);
	295	SSPUSHINT(*intp);
	296	SSPUSHPTR(intp);
	297	SSPUSHINT(SAVEt_I32);
	298	}
	299
a0d0e21e	300	void
8ac85365	301	save_I16(I16 *intp)
55497cff	302	{
e858de61	303	dTHR;
55497cff	304	SSCHECK(3);
	305	SSPUSHINT(*intp);
	306	SSPUSHPTR(intp);
	307	SSPUSHINT(SAVEt_I16);
	308	}
	309
	310	void
8ac85365	311	save_iv(IV *ivp)
a0d0e21e	312	{
11343788	313	dTHR;
a0d0e21e	314	SSCHECK(3);
4aa0a1f7	315	SSPUSHIV(*ivp);
a0d0e21e	316	SSPUSHPTR(ivp);
	317	SSPUSHINT(SAVEt_IV);
	318	}
	319
85e6fe83	320	/* Cannot use save_sptr() to store a char* since the SV** cast will
	321	* force word-alignment and we'll miss the pointer.
	322	*/
	323	void
8ac85365	324	save_pptr(char **pptr)
85e6fe83	325	{
11343788	326	dTHR;
85e6fe83	327	SSCHECK(3);
	328	SSPUSHPTR(*pptr);
	329	SSPUSHPTR(pptr);
	330	SSPUSHINT(SAVEt_PPTR);
	331	}
	332
79072805	333	void
8ac85365	334	save_sptr(SV **sptr)
79072805	335	{
11343788	336	dTHR;
79072805	337	SSCHECK(3);
	338	SSPUSHPTR(*sptr);
	339	SSPUSHPTR(sptr);
	340	SSPUSHINT(SAVEt_SPTR);
	341	}
	342
54b9620d	343	SV **
	344	save_threadsv(PADOFFSET i)
	345	{
	346	#ifdef USE_THREADS
	347	dTHR;
940cb80d	348	SV *svp = &THREADSV(i); / XXX Change to save by offset */
54b9620d	349	DEBUG_L(PerlIO_printf(PerlIO_stderr(), "save_threadsv %u: %p %p:%s\n",
	350	i, svp, svp, SvPEEK(svp)));
	351	save_svref(svp);
	352	return svp;
	353	#else
	354	croak("panic: save_threadsv called in non-threaded perl");
	355	return 0;
	356	#endif /* USE_THREADS */
	357	}
	358
79072805	359	void
8ac85365	360	save_nogv(GV *gv)
79072805	361	{
11343788	362	dTHR;
79072805	363	SSCHECK(2);
	364	SSPUSHPTR(gv);
	365	SSPUSHINT(SAVEt_NSTAB);
	366	}
	367
	368	void
8ac85365	369	save_hptr(HV **hptr)
79072805	370	{
11343788	371	dTHR;
79072805	372	SSCHECK(3);
85e6fe83	373	SSPUSHPTR(*hptr);
79072805	374	SSPUSHPTR(hptr);
	375	SSPUSHINT(SAVEt_HPTR);
	376	}
	377
	378	void
8ac85365	379	save_aptr(AV **aptr)
79072805	380	{
11343788	381	dTHR;
79072805	382	SSCHECK(3);
85e6fe83	383	SSPUSHPTR(*aptr);
79072805	384	SSPUSHPTR(aptr);
	385	SSPUSHINT(SAVEt_APTR);
	386	}
	387
	388	void
8ac85365	389	save_freesv(SV *sv)
8990e307	390	{
11343788	391	dTHR;
8990e307	392	SSCHECK(2);
	393	SSPUSHPTR(sv);
	394	SSPUSHINT(SAVEt_FREESV);
	395	}
	396
	397	void
8ac85365	398	save_freeop(OP *o)
8990e307	399	{
11343788	400	dTHR;
8990e307	401	SSCHECK(2);
11343788	402	SSPUSHPTR(o);
8990e307	403	SSPUSHINT(SAVEt_FREEOP);
	404	}
	405
	406	void
8ac85365	407	save_freepv(char *pv)
8990e307	408	{
11343788	409	dTHR;
8990e307	410	SSCHECK(2);
	411	SSPUSHPTR(pv);
	412	SSPUSHINT(SAVEt_FREEPV);
	413	}
	414
	415	void
8ac85365	416	save_clearsv(SV **svp)
8990e307	417	{
11343788	418	dTHR;
8990e307	419	SSCHECK(2);
4aa0a1f7	420	SSPUSHLONG((long)(svp-curpad));
8990e307	421	SSPUSHINT(SAVEt_CLEARSV);
	422	}
	423
	424	void
8ac85365	425	save_delete(HV hv, char key, I32 klen)
8990e307	426	{
11343788	427	dTHR;
8990e307	428	SSCHECK(4);
	429	SSPUSHINT(klen);
	430	SSPUSHPTR(key);
	431	SSPUSHPTR(hv);
	432	SSPUSHINT(SAVEt_DELETE);
	433	}
	434
	435	void
8ac85365	436	save_list(register SV **sarg, I32 maxsarg)
79072805	437	{
11343788	438	dTHR;
79072805	439	register SV *sv;
	440	register I32 i;
	441
79072805	442	for (i = 1; i <= maxsarg; i++) {
79072805	443	sv = NEWSV(0,0);
79072805	444	sv_setsv(sv,sarg[i]);
f46d017c	445	SSCHECK(3);
f46d017c	446	SSPUSHPTR(sarg[i]); /* remember the pointer */
79072805	447	SSPUSHPTR(sv); /* remember the value */
	448	SSPUSHINT(SAVEt_ITEM);
	449	}
	450	}
	451
	452	void
8ac85365	453	save_destructor(void (f) (void ), void *p)
a0d0e21e	454	{
11343788	455	dTHR;
a0d0e21e	456	SSCHECK(3);
	457	SSPUSHDPTR(f);
	458	SSPUSHPTR(p);
	459	SSPUSHINT(SAVEt_DESTRUCTOR);
	460	}
	461
	462	void
8ac85365	463	save_op(void)
462e5cf6	464	{
	465	dTHR;
	466	SSCHECK(2);
	467	SSPUSHPTR(op);
	468	SSPUSHINT(SAVEt_OP);
	469	}
	470
	471	void
8ac85365	472	leave_scope(I32 base)
79072805	473	{
11343788	474	dTHR;
79072805	475	register SV *sv;
	476	register SV *value;
	477	register GV *gv;
	478	register AV *av;
	479	register HV *hv;
	480	register void* ptr;
	481
	482	if (base < -1)
463ee0b2	483	croak("panic: corrupt saved stack index");
79072805	484	while (savestack_ix > base) {
	485	switch (SSPOPINT) {
	486	case SAVEt_ITEM: /* normal string */
	487	value = (SV*)SSPOPPTR;
	488	sv = (SV*)SSPOPPTR;
	489	sv_replace(sv,value);
748a9306	490	localizing = 2;
79072805	491	SvSETMAGIC(sv);
748a9306	492	localizing = 0;
79072805	493	break;
	494	case SAVEt_SV: /* scalar reference */
	495	value = (SV*)SSPOPPTR;
	496	gv = (GV*)SSPOPPTR;
7a4c00b4	497	ptr = &GvSV(gv);
7a4c00b4	498	goto restore_sv;
79072805	499	case SAVEt_SVREF: /* scalar reference */
7a4c00b4	500	value = (SV*)SSPOPPTR;
79072805	501	ptr = SSPOPPTR;
7a4c00b4	502	restore_sv:
79072805	503	sv = (SV*)ptr;
54b9620d	504	DEBUG_L(PerlIO_printf(PerlIO_stderr(),
	505	"restore svref: %p %p:%s -> %p:%s\n",
	506	ptr, sv, SvPEEK(sv), value, SvPEEK(value)));
748a9306	507	if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
	508	SvTYPE(sv) != SVt_PVGV)
	509	{
a0d0e21e	510	(void)SvUPGRADE(value, SvTYPE(sv));
	511	SvMAGIC(value) = SvMAGIC(sv);
	512	SvFLAGS(value) \|= SvMAGICAL(sv);
	513	SvMAGICAL_off(sv);
79072805	514	SvMAGIC(sv) = 0;
a0d0e21e	515	}
7a4c00b4	516	else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
	517	SvTYPE(value) != SVt_PVGV)
	518	{
	519	SvFLAGS(value) \|= (SvFLAGS(value) &
	520	(SVp_IOK\|SVp_NOK\|SVp_POK)) >> PRIVSHIFT;
	521	SvMAGICAL_off(value);
	522	SvMAGIC(value) = 0;
	523	}
8990e307	524	SvREFCNT_dec(sv);
a0d0e21e	525	(SV*)ptr = value;
748a9306	526	localizing = 2;
a0d0e21e	527	SvSETMAGIC(value);
748a9306	528	localizing = 0;
79072805	529	break;
	530	case SAVEt_AV: /* array reference */
	531	av = (AV*)SSPOPPTR;
	532	gv = (GV*)SSPOPPTR;
fb73857a	533	if (GvAV(gv)) {
	534	AV *goner = GvAV(gv);
	535	SvMAGIC(av) = SvMAGIC(goner);
	536	SvFLAGS(av) \|= SvMAGICAL(goner);
	537	SvMAGICAL_off(goner);
	538	SvMAGIC(goner) = 0;
	539	SvREFCNT_dec(goner);
	540	}
79072805	541	GvAV(gv) = av;
fb73857a	542	if (SvMAGICAL(av)) {
	543	localizing = 2;
	544	SvSETMAGIC((SV*)av);
	545	localizing = 0;
	546	}
79072805	547	break;
	548	case SAVEt_HV: /* hash reference */
	549	hv = (HV*)SSPOPPTR;
	550	gv = (GV*)SSPOPPTR;
fb73857a	551	if (GvHV(gv)) {
	552	HV *goner = GvHV(gv);
	553	SvMAGIC(hv) = SvMAGIC(goner);
	554	SvFLAGS(hv) \|= SvMAGICAL(goner);
	555	SvMAGICAL_off(goner);
	556	SvMAGIC(goner) = 0;
	557	SvREFCNT_dec(goner);
	558	}
79072805	559	GvHV(gv) = hv;
fb73857a	560	if (SvMAGICAL(hv)) {
	561	localizing = 2;
	562	SvSETMAGIC((SV*)hv);
	563	localizing = 0;
	564	}
79072805	565	break;
	566	case SAVEt_INT: /* int reference */
	567	ptr = SSPOPPTR;
	568	(int)ptr = (int)SSPOPINT;
	569	break;
85e6fe83	570	case SAVEt_LONG: /* long reference */
	571	ptr = SSPOPPTR;
	572	(long)ptr = (long)SSPOPLONG;
	573	break;
79072805	574	case SAVEt_I32: /* I32 reference */
	575	ptr = SSPOPPTR;
	576	(I32)ptr = (I32)SSPOPINT;
	577	break;
55497cff	578	case SAVEt_I16: /* I16 reference */
	579	ptr = SSPOPPTR;
	580	(I16)ptr = (I16)SSPOPINT;
	581	break;
a0d0e21e	582	case SAVEt_IV: /* IV reference */
	583	ptr = SSPOPPTR;
	584	(IV)ptr = (IV)SSPOPIV;
	585	break;
79072805	586	case SAVEt_SPTR: /* SV* reference */
	587	ptr = SSPOPPTR;
	588	(SV)ptr = (SV)SSPOPPTR;
	589	break;
85e6fe83	590	case SAVEt_PPTR: /* char* reference */
	591	ptr = SSPOPPTR;
	592	(char)ptr = (char)SSPOPPTR;
	593	break;
79072805	594	case SAVEt_HPTR: /* HV* reference */
	595	ptr = SSPOPPTR;
	596	(HV)ptr = (HV)SSPOPPTR;
	597	break;
	598	case SAVEt_APTR: /* AV* reference */
	599	ptr = SSPOPPTR;
	600	(AV)ptr = (AV)SSPOPPTR;
	601	break;
	602	case SAVEt_NSTAB:
	603	gv = (GV*)SSPOPPTR;
1f96a9ed	604	(void)sv_clear((SV*)gv);
79072805	605	break;
fb73857a	606	case SAVEt_GP: /* scalar reference */
79072805	607	ptr = SSPOPPTR;
79072805	608	gv = (GV*)SSPOPPTR;
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;
f46d017c	615	gp_free(gv);
f46d017c	616	GvGP(gv) = (GP*)ptr;
4633a7c4	617	SvREFCNT_dec(gv);
79072805	618	break;
8990e307	619	case SAVEt_FREESV:
	620	ptr = SSPOPPTR;
	621	SvREFCNT_dec((SV*)ptr);
	622	break;
	623	case SAVEt_FREEOP:
	624	ptr = SSPOPPTR;
46fc3d4c	625	if (comppad)
46fc3d4c	626	curpad = AvARRAY(comppad);
8990e307	627	op_free((OP*)ptr);
	628	break;
	629	case SAVEt_FREEPV:
	630	ptr = SSPOPPTR;
	631	Safefree((char*)ptr);
	632	break;
	633	case SAVEt_CLEARSV:
4aa0a1f7	634	ptr = (void*)&curpad[SSPOPLONG];
8990e307	635	sv = (SV*)ptr;
bc44cdaf	636	/* Can clear pad variable in place? */
bc44cdaf	637	if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
8990e307	638	if (SvTHINKFIRST(sv)) {
	639	if (SvREADONLY(sv))
	640	croak("panic: leave_scope clearsv");
	641	if (SvROK(sv))
	642	sv_unref(sv);
	643	}
a0d0e21e	644	if (SvMAGICAL(sv))
a0d0e21e	645	mg_free(sv);
8990e307	646
	647	switch (SvTYPE(sv)) {
	648	case SVt_NULL:
	649	break;
	650	case SVt_PVAV:
44a8e56a	651	av_clear((AV*)sv);
8990e307	652	break;
8990e307	653	case SVt_PVHV:
44a8e56a	654	hv_clear((HV*)sv);
8990e307	655	break;
8990e307	656	case SVt_PVCV:
5377b701	657	croak("panic: leave_scope pad code");
	658	case SVt_RV:
	659	case SVt_IV:
	660	case SVt_NV:
	661	(void)SvOK_off(sv);
8990e307	662	break;
8990e307	663	default:
a0d0e21e	664	(void)SvOK_off(sv);
5377b701	665	(void)SvOOK_off(sv);
8990e307	666	break;
	667	}
	668	}
	669	else { /* Someone has a claim on this, so abandon it. */
4aa0a1f7	670	U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY\|SVs_PADMY\|SVs_PADTMP);
8990e307	671	switch (SvTYPE(sv)) { /* Console ourselves with a new value */
	672	case SVt_PVAV: (SV)ptr = (SV)newAV(); break;
	673	case SVt_PVHV: (SV)ptr = (SV)newHV(); break;
	674	default: (SV*)ptr = NEWSV(0,0); break;
	675	}
53868620	676	SvREFCNT_dec(sv); /* Cast current value to the winds. */
4aa0a1f7	677	SvFLAGS((SV)ptr) \|= padflags; / preserve pad nature */
8990e307	678	}
	679	break;
	680	case SAVEt_DELETE:
	681	ptr = SSPOPPTR;
	682	hv = (HV*)ptr;
	683	ptr = SSPOPPTR;
748a9306	684	(void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
adbc6bb1	685	Safefree(ptr);
8990e307	686	break;
a0d0e21e	687	case SAVEt_DESTRUCTOR:
	688	ptr = SSPOPPTR;
	689	(*SSPOPDPTR)(ptr);
	690	break;
	691	case SAVEt_REGCONTEXT:
8e07c86e	692	{
	693	I32 delta = SSPOPINT;
	694	savestack_ix -= delta; /* regexp must have croaked */
	695	}
a0d0e21e	696	break;
55497cff	697	case SAVEt_STACK_POS: /* Position on Perl stack */
	698	{
	699	I32 delta = SSPOPINT;
	700	stack_sp = stack_base + delta;
	701	}
	702	break;
462e5cf6	703	case SAVEt_OP:
	704	op = (OP*)SSPOPPTR;
	705	break;
79072805	706	default:
463ee0b2	707	croak("panic: leave_scope inconsistency");
79072805	708	}
	709	}
	710	}
8990e307	711
8990e307	712	#ifdef DEBUGGING
1f96a9ed	713
8990e307	714	void
c09156bb	715	cx_dump(PERL_CONTEXT *cx)
8990e307	716	{
11343788	717	dTHR;
fb73857a	718	PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), block_type[cx->cx_type]);
8990e307	719	if (cx->cx_type != CXt_SUBST) {
760ac839	720	PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
	721	PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
	722	PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
	723	PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
	724	PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
	725	PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
	726	PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
8990e307	727	}
	728	switch (cx->cx_type) {
	729	case CXt_NULL:
	730	case CXt_BLOCK:
	731	break;
	732	case CXt_SUB:
760ac839	733	PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%lx\n",
8990e307	734	(long)cx->blk_sub.cv);
760ac839	735	PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%lx\n",
8990e307	736	(long)cx->blk_sub.gv);
760ac839	737	PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%lx\n",
8990e307	738	(long)cx->blk_sub.dfoutgv);
760ac839	739	PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
8990e307	740	(long)cx->blk_sub.olddepth);
760ac839	741	PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
8990e307	742	(int)cx->blk_sub.hasargs);
	743	break;
	744	case CXt_EVAL:
760ac839	745	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
8990e307	746	(long)cx->blk_eval.old_in_eval);
760ac839	747	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
c07a80fd	748	op_name[cx->blk_eval.old_op_type],
c07a80fd	749	op_desc[cx->blk_eval.old_op_type]);
760ac839	750	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
8990e307	751	cx->blk_eval.old_name);
760ac839	752	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
8990e307	753	(long)cx->blk_eval.old_eval_root);
	754	break;
	755
	756	case CXt_LOOP:
760ac839	757	PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
8990e307	758	cx->blk_loop.label);
760ac839	759	PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
8990e307	760	(long)cx->blk_loop.resetsp);
760ac839	761	PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%lx\n",
8990e307	762	(long)cx->blk_loop.redo_op);
760ac839	763	PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%lx\n",
8990e307	764	(long)cx->blk_loop.next_op);
760ac839	765	PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%lx\n",
8990e307	766	(long)cx->blk_loop.last_op);
760ac839	767	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
8990e307	768	(long)cx->blk_loop.iterix);
760ac839	769	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%lx\n",
8990e307	770	(long)cx->blk_loop.iterary);
760ac839	771	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%lx\n",
8990e307	772	(long)cx->blk_loop.itervar);
8990e307	773	if (cx->blk_loop.itervar)
760ac839	774	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%lx\n",
8990e307	775	(long)cx->blk_loop.itersave);
7a4c00b4	776	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%lx\n",
7a4c00b4	777	(long)cx->blk_loop.iterlval);
8990e307	778	break;
	779
	780	case CXt_SUBST:
760ac839	781	PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
8990e307	782	(long)cx->sb_iters);
760ac839	783	PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
8990e307	784	(long)cx->sb_maxiters);
760ac839	785	PerlIO_printf(Perl_debug_log, "SB_SAFEBASE = %ld\n",
8990e307	786	(long)cx->sb_safebase);
760ac839	787	PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
8990e307	788	(long)cx->sb_once);
760ac839	789	PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
8990e307	790	cx->sb_orig);
760ac839	791	PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%lx\n",
8990e307	792	(long)cx->sb_dstr);
760ac839	793	PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%lx\n",
8990e307	794	(long)cx->sb_targ);
760ac839	795	PerlIO_printf(Perl_debug_log, "SB_S = 0x%lx\n",
8990e307	796	(long)cx->sb_s);
760ac839	797	PerlIO_printf(Perl_debug_log, "SB_M = 0x%lx\n",
8990e307	798	(long)cx->sb_m);
760ac839	799	PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%lx\n",
8990e307	800	(long)cx->sb_strend);
c90c0ff4	801	PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%lx\n",
c90c0ff4	802	(long)cx->sb_rxres);
8990e307	803	break;
	804	}
	805	}
	806	#endif