[perl5.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(sp, p, n)
SV** sp;
SV** p;
int n;
{
    dTHR;
    stack_sp = sp;
    av_extend(curstack, (p - stack_base) + (n) + 128);
    return stack_sp;
}

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

void
push_return(retop)
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()
{
    dTHR;
    if (retstack_ix > 0)
	return retstack[--retstack_ix];
    else
	return Nullop;
}

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

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

void
free_tmps()
{
    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(sptr)
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 *gv;
{
    dTHR;
    SSCHECK(3);
    SSPUSHPTR(gv);
    SSPUSHPTR(GvSV(gv));
    SSPUSHINT(SAVEt_SV);
    return save_scalar_at(&GvSV(gv));
}

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

void
save_gp(gv, empty)
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 *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 *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(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(intp)
int *intp;
{
    dTHR;
    SSCHECK(3);
    SSPUSHINT(*intp);
    SSPUSHPTR(intp);
    SSPUSHINT(SAVEt_INT);
}

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

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

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

void
save_iv(ivp)
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(pptr)
char **pptr;
{
    dTHR;
    SSCHECK(3);
    SSPUSHPTR(*pptr);
    SSPUSHPTR(pptr);
    SSPUSHINT(SAVEt_PPTR);
}

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

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

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

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

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

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

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

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

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

void
save_list(sarg,maxsarg)
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(f,p)
void (*f) _((void*));
void* p;
{
    dTHR;
    SSCHECK(3);
    SSPUSHDPTR(f);
    SSPUSHPTR(p);
    SSPUSHINT(SAVEt_DESTRUCTOR);
}

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

void
leave_scope(base)
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;
	    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);
		SvREFCNT_dec(sv);	/* Cast current value to the winds. */
		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;
		}
		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(cx)
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 LW	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 LW	8	*/
	9
	10	/*
	11	* "For the fashion of Minas Tirith was such that it was built on seven
	12	* levels..."
79072805 LW	13	*/
	14
	15	#include "EXTERN.h"
	16	#include "perl.h"
	17
a0d0e21e LW	18	SV**
	19	stack_grow(sp, p, n)
	20	SV** sp;
	21	SV** p;
	22	int n;
	23	{
11343788	24	dTHR;
a0d0e21e	25	stack_sp = sp;
1f96a9ed	26	av_extend(curstack, (p - stack_base) + (n) + 128);
a0d0e21e LW	27	return stack_sp;
	28	}
	29
79072805 LW	30	I32
	31	cxinc()
	32	{
11343788	33	dTHR;
79072805	34	cxstack_max = cxstack_max * 3 / 2;
a38d6535	35	Renew(cxstack, cxstack_max + 1, CONTEXT); /* XXX should fix CXINC macro */
79072805 LW	36	return cxstack_ix + 1;
	37	}
	38
	39	void
	40	push_return(retop)
	41	OP *retop;
	42	{
11343788	43	dTHR;
79072805 LW	44	if (retstack_ix == retstack_max) {
	45	retstack_max = retstack_max * 3 / 2;
	46	Renew(retstack, retstack_max, OP*);
	47	}
	48	retstack[retstack_ix++] = retop;
	49	}
	50
	51	OP *
	52	pop_return()
	53	{
11343788	54	dTHR;
79072805 LW	55	if (retstack_ix > 0)
	56	return retstack[--retstack_ix];
	57	else
	58	return Nullop;
	59	}
	60
	61	void
	62	push_scope()
	63	{
11343788	64	dTHR;
79072805 LW	65	if (scopestack_ix == scopestack_max) {
	66	scopestack_max = scopestack_max * 3 / 2;
	67	Renew(scopestack, scopestack_max, I32);
	68	}
	69	scopestack[scopestack_ix++] = savestack_ix;
	70
	71	}
	72
	73	void
	74	pop_scope()
	75	{
11343788	76	dTHR;
79072805	77	I32 oldsave = scopestack[--scopestack_ix];
8990e307	78	LEAVE_SCOPE(oldsave);
79072805 LW	79	}
	80
	81	void
a0d0e21e LW	82	markstack_grow()
a0d0e21e LW	83	{
11343788	84	dTHR;
a0d0e21e LW	85	I32 oldmax = markstack_max - markstack;
	86	I32 newmax = oldmax * 3 / 2;
	87
	88	Renew(markstack, newmax, I32);
	89	markstack_ptr = markstack + oldmax;
	90	markstack_max = markstack + newmax;
	91	}
	92
	93	void
79072805 LW	94	savestack_grow()
79072805 LW	95	{
11343788	96	dTHR;
79072805 LW	97	savestack_max = savestack_max * 3 / 2;
	98	Renew(savestack, savestack_max, ANY);
	99	}
	100
	101	void
	102	free_tmps()
	103	{
11343788	104	dTHR;
79072805 LW	105	/* XXX should tmps_floor live in cxstack? */
	106	I32 myfloor = tmps_floor;
	107	while (tmps_ix > myfloor) { /* clean up after last statement */
	108	SV* sv = tmps_stack[tmps_ix];
	109	tmps_stack[tmps_ix--] = Nullsv;
463ee0b2 LW	110	if (sv) {
	111	#ifdef DEBUGGING
	112	SvTEMP_off(sv);
	113	#endif
8990e307	114	SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
463ee0b2	115	}
79072805 LW	116	}
	117	}
	118
7a4c00b4	119	static SV *
	120	save_scalar_at(sptr)
	121	SV **sptr;
79072805	122	{
11343788	123	dTHR;
79072805	124	register SV *sv;
7a4c00b4	125	SV osv = sptr;
79072805	126
7a4c00b4	127	sv = *sptr = NEWSV(0,0);
a0d0e21e	128	if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
79072805	129	sv_upgrade(sv, SvTYPE(osv));
a0d0e21e	130	if (SvGMAGICAL(osv)) {
748a9306 LW	131	MAGIC* mg;
748a9306 LW	132	bool oldtainted = tainted;
a0d0e21e	133	mg_get(osv);
748a9306 LW	134	if (tainting && tainted && (mg = mg_find(osv, 't'))) {
	135	SAVESPTR(mg->mg_obj);
	136	mg->mg_obj = osv;
	137	}
a0d0e21e LW	138	SvFLAGS(osv) \|= (SvFLAGS(osv) &
a0d0e21e LW	139	(SVp_IOK\|SVp_NOK\|SVp_POK)) >> PRIVSHIFT;
748a9306	140	tainted = oldtainted;
a0d0e21e	141	}
79072805	142	SvMAGIC(sv) = SvMAGIC(osv);
a0d0e21e	143	SvFLAGS(sv) \|= SvMAGICAL(osv);
748a9306	144	localizing = 1;
79072805	145	SvSETMAGIC(sv);
748a9306	146	localizing = 0;
79072805 LW	147	}
	148	return sv;
	149	}
	150
7a4c00b4	151	SV *
	152	save_scalar(gv)
	153	GV *gv;
	154	{
11343788	155	dTHR;
7a4c00b4	156	SSCHECK(3);
	157	SSPUSHPTR(gv);
	158	SSPUSHPTR(GvSV(gv));
	159	SSPUSHINT(SAVEt_SV);
	160	return save_scalar_at(&GvSV(gv));
	161	}
	162
	163	SV*
	164	save_svref(sptr)
	165	SV **sptr;
	166	{
11343788	167	dTHR;
7a4c00b4	168	SSCHECK(3);
	169	SSPUSHPTR(sptr);
	170	SSPUSHPTR(*sptr);
	171	SSPUSHINT(SAVEt_SVREF);
	172	return save_scalar_at(sptr);
	173	}
	174
79072805	175	void
5f05dabc	176	save_gp(gv, empty)
79072805	177	GV *gv;
5f05dabc	178	I32 empty;
79072805	179	{
e858de61	180	dTHR;
fb73857a	181	SSCHECK(6);
	182	SSPUSHIV((IV)SvLEN(gv));
	183	SvLEN(gv) = 0; /* forget that anything was allocated here */
	184	SSPUSHIV((IV)SvCUR(gv));
	185	SSPUSHPTR(SvPVX(gv));
	186	SvPOK_off(gv);
4633a7c4	187	SSPUSHPTR(SvREFCNT_inc(gv));
5f05dabc	188	SSPUSHPTR(GvGP(gv));
79072805 LW	189	SSPUSHINT(SAVEt_GP);
79072805 LW	190
5f05dabc	191	if (empty) {
	192	register GP *gp;
	193	Newz(602, gp, 1, GP);
44a8e56a	194	GvGP(gv) = gp_ref(gp);
5f05dabc	195	GvSV(gv) = NEWSV(72,0);
	196	GvLINE(gv) = curcop->cop_line;
	197	GvEGV(gv) = gv;
	198	}
	199	else {
44a8e56a	200	gp_ref(GvGP(gv));
5f05dabc	201	GvINTRO_on(gv);
5f05dabc	202	}
79072805	203	}
79072805	204
79072805 LW	205	AV *
	206	save_ary(gv)
	207	GV *gv;
	208	{
11343788	209	dTHR;
fb73857a	210	AV oav, av;
fb73857a	211
79072805 LW	212	SSCHECK(3);
79072805 LW	213	SSPUSHPTR(gv);
fb73857a	214	SSPUSHPTR(oav = GvAVn(gv));
79072805 LW	215	SSPUSHINT(SAVEt_AV);
	216
	217	GvAV(gv) = Null(AV*);
fb73857a	218	av = GvAVn(gv);
	219	if (SvMAGIC(oav)) {
	220	SvMAGIC(av) = SvMAGIC(oav);
	221	SvFLAGS(av) \|= SvMAGICAL(oav);
	222	SvMAGICAL_off(oav);
	223	SvMAGIC(oav) = 0;
	224	localizing = 1;
	225	SvSETMAGIC((SV*)av);
	226	localizing = 0;
	227	}
	228	return av;
79072805 LW	229	}
	230
	231	HV *
	232	save_hash(gv)
	233	GV *gv;
	234	{
11343788	235	dTHR;
fb73857a	236	HV ohv, hv;
fb73857a	237
79072805 LW	238	SSCHECK(3);
79072805 LW	239	SSPUSHPTR(gv);
fb73857a	240	SSPUSHPTR(ohv = GvHVn(gv));
79072805 LW	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 LW	255	}
	256
	257	void
	258	save_item(item)
	259	register SV *item;
	260	{
11343788	261	dTHR;
79072805 LW	262	register SV *sv;
	263
	264	SSCHECK(3);
	265	SSPUSHPTR(item); /* remember the pointer */
	266	sv = NEWSV(0,0);
	267	sv_setsv(sv,item);
	268	SSPUSHPTR(sv); /* remember the value */
	269	SSPUSHINT(SAVEt_ITEM);
	270	}
	271
	272	void
	273	save_int(intp)
	274	int *intp;
	275	{
11343788	276	dTHR;
79072805 LW	277	SSCHECK(3);
	278	SSPUSHINT(*intp);
	279	SSPUSHPTR(intp);
	280	SSPUSHINT(SAVEt_INT);
	281	}
	282
	283	void
85e6fe83 LW	284	save_long(longp)
	285	long *longp;
	286	{
11343788	287	dTHR;
85e6fe83 LW	288	SSCHECK(3);
	289	SSPUSHLONG(*longp);
	290	SSPUSHPTR(longp);
	291	SSPUSHINT(SAVEt_LONG);
	292	}
	293
	294	void
79072805 LW	295	save_I32(intp)
	296	I32 *intp;
	297	{
11343788	298	dTHR;
79072805 LW	299	SSCHECK(3);
	300	SSPUSHINT(*intp);
	301	SSPUSHPTR(intp);
	302	SSPUSHINT(SAVEt_I32);
	303	}
	304
a0d0e21e	305	void
55497cff	306	save_I16(intp)
	307	I16 *intp;
	308	{
e858de61	309	dTHR;
55497cff	310	SSCHECK(3);
	311	SSPUSHINT(*intp);
	312	SSPUSHPTR(intp);
	313	SSPUSHINT(SAVEt_I16);
	314	}
	315
	316	void
a0d0e21e LW	317	save_iv(ivp)
	318	IV *ivp;
	319	{
11343788	320	dTHR;
a0d0e21e	321	SSCHECK(3);
4aa0a1f7	322	SSPUSHIV(*ivp);
a0d0e21e LW	323	SSPUSHPTR(ivp);
	324	SSPUSHINT(SAVEt_IV);
	325	}
	326
85e6fe83 LW	327	/* Cannot use save_sptr() to store a char* since the SV** cast will
	328	* force word-alignment and we'll miss the pointer.
	329	*/
	330	void
	331	save_pptr(pptr)
	332	char **pptr;
	333	{
11343788	334	dTHR;
85e6fe83 LW	335	SSCHECK(3);
	336	SSPUSHPTR(*pptr);
	337	SSPUSHPTR(pptr);
	338	SSPUSHINT(SAVEt_PPTR);
	339	}
	340
79072805 LW	341	void
	342	save_sptr(sptr)
	343	SV **sptr;
	344	{
11343788	345	dTHR;
79072805 LW	346	SSCHECK(3);
	347	SSPUSHPTR(*sptr);
	348	SSPUSHPTR(sptr);
	349	SSPUSHINT(SAVEt_SPTR);
	350	}
	351
	352	void
	353	save_nogv(gv)
	354	GV *gv;
	355	{
11343788	356	dTHR;
79072805 LW	357	SSCHECK(2);
	358	SSPUSHPTR(gv);
	359	SSPUSHINT(SAVEt_NSTAB);
	360	}
	361
	362	void
	363	save_hptr(hptr)
	364	HV **hptr;
	365	{
11343788	366	dTHR;
79072805	367	SSCHECK(3);
85e6fe83	368	SSPUSHPTR(*hptr);
79072805 LW	369	SSPUSHPTR(hptr);
	370	SSPUSHINT(SAVEt_HPTR);
	371	}
	372
	373	void
	374	save_aptr(aptr)
	375	AV **aptr;
	376	{
11343788	377	dTHR;
79072805	378	SSCHECK(3);
85e6fe83	379	SSPUSHPTR(*aptr);
79072805 LW	380	SSPUSHPTR(aptr);
	381	SSPUSHINT(SAVEt_APTR);
	382	}
	383
	384	void
8990e307 LW	385	save_freesv(sv)
	386	SV *sv;
	387	{
11343788	388	dTHR;
8990e307 LW	389	SSCHECK(2);
	390	SSPUSHPTR(sv);
	391	SSPUSHINT(SAVEt_FREESV);
	392	}
	393
	394	void
11343788 MB	395	save_freeop(o)
11343788 MB	396	OP *o;
8990e307	397	{
11343788	398	dTHR;
8990e307	399	SSCHECK(2);
11343788	400	SSPUSHPTR(o);
8990e307 LW	401	SSPUSHINT(SAVEt_FREEOP);
	402	}
	403
	404	void
	405	save_freepv(pv)
	406	char *pv;
	407	{
11343788	408	dTHR;
8990e307 LW	409	SSCHECK(2);
	410	SSPUSHPTR(pv);
	411	SSPUSHINT(SAVEt_FREEPV);
	412	}
	413
	414	void
	415	save_clearsv(svp)
	416	SV** svp;
	417	{
11343788	418	dTHR;
8990e307	419	SSCHECK(2);
4aa0a1f7	420	SSPUSHLONG((long)(svp-curpad));
8990e307 LW	421	SSPUSHINT(SAVEt_CLEARSV);
	422	}
	423
	424	void
	425	save_delete(hv,key,klen)
	426	HV *hv;
	427	char *key;
	428	I32 klen;
	429	{
11343788	430	dTHR;
8990e307 LW	431	SSCHECK(4);
	432	SSPUSHINT(klen);
	433	SSPUSHPTR(key);
	434	SSPUSHPTR(hv);
	435	SSPUSHINT(SAVEt_DELETE);
	436	}
	437
	438	void
79072805 LW	439	save_list(sarg,maxsarg)
	440	register SV **sarg;
	441	I32 maxsarg;
	442	{
11343788	443	dTHR;
79072805 LW	444	register SV *sv;
	445	register I32 i;
	446
	447	SSCHECK(3 * maxsarg);
	448	for (i = 1; i <= maxsarg; i++) {
	449	SSPUSHPTR(sarg[i]); /* remember the pointer */
	450	sv = NEWSV(0,0);
	451	sv_setsv(sv,sarg[i]);
	452	SSPUSHPTR(sv); /* remember the value */
	453	SSPUSHINT(SAVEt_ITEM);
	454	}
	455	}
	456
	457	void
a0d0e21e LW	458	save_destructor(f,p)
	459	void (f) _((void));
	460	void* p;
	461	{
11343788	462	dTHR;
a0d0e21e LW	463	SSCHECK(3);
	464	SSPUSHDPTR(f);
	465	SSPUSHPTR(p);
	466	SSPUSHINT(SAVEt_DESTRUCTOR);
	467	}
	468
	469	void
462e5cf6 MB	470	save_op()
	471	{
	472	dTHR;
	473	SSCHECK(2);
	474	SSPUSHPTR(op);
	475	SSPUSHINT(SAVEt_OP);
	476	}
	477
	478	void
79072805 LW	479	leave_scope(base)
	480	I32 base;
	481	{
11343788	482	dTHR;
79072805 LW	483	register SV *sv;
	484	register SV *value;
	485	register GV *gv;
	486	register AV *av;
	487	register HV *hv;
	488	register void* ptr;
	489
	490	if (base < -1)
463ee0b2	491	croak("panic: corrupt saved stack index");
79072805 LW	492	while (savestack_ix > base) {
	493	switch (SSPOPINT) {
	494	case SAVEt_ITEM: /* normal string */
	495	value = (SV*)SSPOPPTR;
	496	sv = (SV*)SSPOPPTR;
	497	sv_replace(sv,value);
748a9306	498	localizing = 2;
79072805	499	SvSETMAGIC(sv);
748a9306	500	localizing = 0;
79072805 LW	501	break;
	502	case SAVEt_SV: /* scalar reference */
	503	value = (SV*)SSPOPPTR;
	504	gv = (GV*)SSPOPPTR;
7a4c00b4	505	ptr = &GvSV(gv);
7a4c00b4	506	goto restore_sv;
79072805	507	case SAVEt_SVREF: /* scalar reference */
7a4c00b4	508	value = (SV*)SSPOPPTR;
79072805	509	ptr = SSPOPPTR;
7a4c00b4	510	restore_sv:
79072805	511	sv = (SV*)ptr;
748a9306 LW	512	if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
	513	SvTYPE(sv) != SVt_PVGV)
	514	{
a0d0e21e LW	515	(void)SvUPGRADE(value, SvTYPE(sv));
	516	SvMAGIC(value) = SvMAGIC(sv);
	517	SvFLAGS(value) \|= SvMAGICAL(sv);
	518	SvMAGICAL_off(sv);
79072805	519	SvMAGIC(sv) = 0;
a0d0e21e	520	}
7a4c00b4	521	else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
	522	SvTYPE(value) != SVt_PVGV)
	523	{
	524	SvFLAGS(value) \|= (SvFLAGS(value) &
	525	(SVp_IOK\|SVp_NOK\|SVp_POK)) >> PRIVSHIFT;
	526	SvMAGICAL_off(value);
	527	SvMAGIC(value) = 0;
	528	}
8990e307	529	SvREFCNT_dec(sv);
a0d0e21e	530	(SV*)ptr = value;
748a9306	531	localizing = 2;
a0d0e21e	532	SvSETMAGIC(value);
748a9306	533	localizing = 0;
79072805 LW	534	break;
	535	case SAVEt_AV: /* array reference */
	536	av = (AV*)SSPOPPTR;
	537	gv = (GV*)SSPOPPTR;
fb73857a	538	if (GvAV(gv)) {
	539	AV *goner = GvAV(gv);
	540	SvMAGIC(av) = SvMAGIC(goner);
	541	SvFLAGS(av) \|= SvMAGICAL(goner);
	542	SvMAGICAL_off(goner);
	543	SvMAGIC(goner) = 0;
	544	SvREFCNT_dec(goner);
	545	}
79072805	546	GvAV(gv) = av;
fb73857a	547	if (SvMAGICAL(av)) {
	548	localizing = 2;
	549	SvSETMAGIC((SV*)av);
	550	localizing = 0;
	551	}
79072805 LW	552	break;
	553	case SAVEt_HV: /* hash reference */
	554	hv = (HV*)SSPOPPTR;
	555	gv = (GV*)SSPOPPTR;
fb73857a	556	if (GvHV(gv)) {
	557	HV *goner = GvHV(gv);
	558	SvMAGIC(hv) = SvMAGIC(goner);
	559	SvFLAGS(hv) \|= SvMAGICAL(goner);
	560	SvMAGICAL_off(goner);
	561	SvMAGIC(goner) = 0;
	562	SvREFCNT_dec(goner);
	563	}
79072805	564	GvHV(gv) = hv;
fb73857a	565	if (SvMAGICAL(hv)) {
	566	localizing = 2;
	567	SvSETMAGIC((SV*)hv);
	568	localizing = 0;
	569	}
79072805 LW	570	break;
	571	case SAVEt_INT: /* int reference */
	572	ptr = SSPOPPTR;
	573	(int)ptr = (int)SSPOPINT;
	574	break;
85e6fe83 LW	575	case SAVEt_LONG: /* long reference */
	576	ptr = SSPOPPTR;
	577	(long)ptr = (long)SSPOPLONG;
	578	break;
79072805 LW	579	case SAVEt_I32: /* I32 reference */
	580	ptr = SSPOPPTR;
	581	(I32)ptr = (I32)SSPOPINT;
	582	break;
55497cff	583	case SAVEt_I16: /* I16 reference */
	584	ptr = SSPOPPTR;
	585	(I16)ptr = (I16)SSPOPINT;
	586	break;
a0d0e21e LW	587	case SAVEt_IV: /* IV reference */
	588	ptr = SSPOPPTR;
	589	(IV)ptr = (IV)SSPOPIV;
	590	break;
79072805 LW	591	case SAVEt_SPTR: /* SV* reference */
	592	ptr = SSPOPPTR;
	593	(SV)ptr = (SV)SSPOPPTR;
	594	break;
85e6fe83 LW	595	case SAVEt_PPTR: /* char* reference */
	596	ptr = SSPOPPTR;
	597	(char)ptr = (char)SSPOPPTR;
	598	break;
79072805 LW	599	case SAVEt_HPTR: /* HV* reference */
	600	ptr = SSPOPPTR;
	601	(HV)ptr = (HV)SSPOPPTR;
	602	break;
	603	case SAVEt_APTR: /* AV* reference */
	604	ptr = SSPOPPTR;
	605	(AV)ptr = (AV)SSPOPPTR;
	606	break;
	607	case SAVEt_NSTAB:
	608	gv = (GV*)SSPOPPTR;
1f96a9ed	609	(void)sv_clear((SV*)gv);
79072805	610	break;
fb73857a	611	case SAVEt_GP: /* scalar reference */
79072805 LW	612	ptr = SSPOPPTR;
	613	gv = (GV*)SSPOPPTR;
	614	gp_free(gv);
	615	GvGP(gv) = (GP*)ptr;
fb73857a	616	if (SvPOK(gv) && SvLEN(gv) > 0) {
	617	Safefree(SvPVX(gv));
	618	}
	619	SvPVX(gv) = (char *)SSPOPPTR;
	620	SvCUR(gv) = (STRLEN)SSPOPIV;
	621	SvLEN(gv) = (STRLEN)SSPOPIV;
4633a7c4	622	SvREFCNT_dec(gv);
79072805	623	break;
8990e307 LW	624	case SAVEt_FREESV:
	625	ptr = SSPOPPTR;
	626	SvREFCNT_dec((SV*)ptr);
	627	break;
	628	case SAVEt_FREEOP:
	629	ptr = SSPOPPTR;
46fc3d4c	630	if (comppad)
46fc3d4c	631	curpad = AvARRAY(comppad);
8990e307 LW	632	op_free((OP*)ptr);
	633	break;
	634	case SAVEt_FREEPV:
	635	ptr = SSPOPPTR;
	636	Safefree((char*)ptr);
	637	break;
	638	case SAVEt_CLEARSV:
4aa0a1f7	639	ptr = (void*)&curpad[SSPOPLONG];
8990e307	640	sv = (SV*)ptr;
bc44cdaf GS	641	/* Can clear pad variable in place? */
bc44cdaf GS	642	if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
8990e307 LW	643	if (SvTHINKFIRST(sv)) {
	644	if (SvREADONLY(sv))
	645	croak("panic: leave_scope clearsv");
	646	if (SvROK(sv))
	647	sv_unref(sv);
	648	}
a0d0e21e LW	649	if (SvMAGICAL(sv))
a0d0e21e LW	650	mg_free(sv);
8990e307 LW	651
	652	switch (SvTYPE(sv)) {
	653	case SVt_NULL:
	654	break;
	655	case SVt_PVAV:
44a8e56a	656	av_clear((AV*)sv);
8990e307 LW	657	break;
8990e307 LW	658	case SVt_PVHV:
44a8e56a	659	hv_clear((HV*)sv);
8990e307 LW	660	break;
8990e307 LW	661	case SVt_PVCV:
5377b701 CS	662	croak("panic: leave_scope pad code");
	663	case SVt_RV:
	664	case SVt_IV:
	665	case SVt_NV:
	666	(void)SvOK_off(sv);
8990e307 LW	667	break;
8990e307 LW	668	default:
a0d0e21e	669	(void)SvOK_off(sv);
5377b701	670	(void)SvOOK_off(sv);
8990e307 LW	671	break;
	672	}
	673	}
	674	else { /* Someone has a claim on this, so abandon it. */
4aa0a1f7	675	U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY\|SVs_PADMY\|SVs_PADTMP);
8990e307 LW	676	SvREFCNT_dec(sv); /* Cast current value to the winds. */
	677	switch (SvTYPE(sv)) { /* Console ourselves with a new value */
	678	case SVt_PVAV: (SV)ptr = (SV)newAV(); break;
	679	case SVt_PVHV: (SV)ptr = (SV)newHV(); break;
	680	default: (SV*)ptr = NEWSV(0,0); break;
	681	}
4aa0a1f7	682	SvFLAGS((SV)ptr) \|= padflags; / preserve pad nature */
8990e307 LW	683	}
	684	break;
	685	case SAVEt_DELETE:
	686	ptr = SSPOPPTR;
	687	hv = (HV*)ptr;
	688	ptr = SSPOPPTR;
748a9306	689	(void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
adbc6bb1	690	Safefree(ptr);
8990e307	691	break;
a0d0e21e LW	692	case SAVEt_DESTRUCTOR:
	693	ptr = SSPOPPTR;
	694	(*SSPOPDPTR)(ptr);
	695	break;
	696	case SAVEt_REGCONTEXT:
8e07c86e AD	697	{
	698	I32 delta = SSPOPINT;
	699	savestack_ix -= delta; /* regexp must have croaked */
	700	}
a0d0e21e	701	break;
55497cff	702	case SAVEt_STACK_POS: /* Position on Perl stack */
	703	{
	704	I32 delta = SSPOPINT;
	705	stack_sp = stack_base + delta;
	706	}
	707	break;
462e5cf6 MB	708	case SAVEt_OP:
	709	op = (OP*)SSPOPPTR;
	710	break;
79072805	711	default:
463ee0b2	712	croak("panic: leave_scope inconsistency");
79072805 LW	713	}
	714	}
	715	}
8990e307 LW	716
8990e307 LW	717	#ifdef DEBUGGING
1f96a9ed	718
8990e307 LW	719	void
	720	cx_dump(cx)
	721	CONTEXT* cx;
	722	{
11343788	723	dTHR;
fb73857a	724	PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), block_type[cx->cx_type]);
8990e307	725	if (cx->cx_type != CXt_SUBST) {
760ac839 LW	726	PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
	727	PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
	728	PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
	729	PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
	730	PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
	731	PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
	732	PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
8990e307 LW	733	}
	734	switch (cx->cx_type) {
	735	case CXt_NULL:
	736	case CXt_BLOCK:
	737	break;
	738	case CXt_SUB:
760ac839	739	PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%lx\n",
8990e307	740	(long)cx->blk_sub.cv);
760ac839	741	PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%lx\n",
8990e307	742	(long)cx->blk_sub.gv);
760ac839	743	PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%lx\n",
8990e307	744	(long)cx->blk_sub.dfoutgv);
760ac839	745	PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
8990e307	746	(long)cx->blk_sub.olddepth);
760ac839	747	PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
8990e307 LW	748	(int)cx->blk_sub.hasargs);
	749	break;
	750	case CXt_EVAL:
760ac839	751	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
8990e307	752	(long)cx->blk_eval.old_in_eval);
760ac839	753	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
c07a80fd	754	op_name[cx->blk_eval.old_op_type],
c07a80fd	755	op_desc[cx->blk_eval.old_op_type]);
760ac839	756	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
8990e307	757	cx->blk_eval.old_name);
760ac839	758	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
8990e307 LW	759	(long)cx->blk_eval.old_eval_root);
	760	break;
	761
	762	case CXt_LOOP:
760ac839	763	PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
8990e307	764	cx->blk_loop.label);
760ac839	765	PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
8990e307	766	(long)cx->blk_loop.resetsp);
760ac839	767	PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%lx\n",
8990e307	768	(long)cx->blk_loop.redo_op);
760ac839	769	PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%lx\n",
8990e307	770	(long)cx->blk_loop.next_op);
760ac839	771	PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%lx\n",
8990e307	772	(long)cx->blk_loop.last_op);
760ac839	773	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
8990e307	774	(long)cx->blk_loop.iterix);
760ac839	775	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%lx\n",
8990e307	776	(long)cx->blk_loop.iterary);
760ac839	777	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%lx\n",
8990e307 LW	778	(long)cx->blk_loop.itervar);
8990e307 LW	779	if (cx->blk_loop.itervar)
760ac839	780	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%lx\n",
8990e307	781	(long)cx->blk_loop.itersave);
7a4c00b4	782	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%lx\n",
7a4c00b4	783	(long)cx->blk_loop.iterlval);
8990e307 LW	784	break;
	785
	786	case CXt_SUBST:
760ac839	787	PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
8990e307	788	(long)cx->sb_iters);
760ac839	789	PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
8990e307	790	(long)cx->sb_maxiters);
760ac839	791	PerlIO_printf(Perl_debug_log, "SB_SAFEBASE = %ld\n",
8990e307	792	(long)cx->sb_safebase);
760ac839	793	PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
8990e307	794	(long)cx->sb_once);
760ac839	795	PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
8990e307	796	cx->sb_orig);
760ac839	797	PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%lx\n",
8990e307	798	(long)cx->sb_dstr);
760ac839	799	PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%lx\n",
8990e307	800	(long)cx->sb_targ);
760ac839	801	PerlIO_printf(Perl_debug_log, "SB_S = 0x%lx\n",
8990e307	802	(long)cx->sb_s);
760ac839	803	PerlIO_printf(Perl_debug_log, "SB_M = 0x%lx\n",
8990e307	804	(long)cx->sb_m);
760ac839	805	PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%lx\n",
8990e307	806	(long)cx->sb_strend);
c90c0ff4	807	PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%lx\n",
c90c0ff4	808	(long)cx->sb_rxres);
8990e307 LW	809	break;
	810	}
	811	}
	812	#endif