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

I32
cxinc()
{
    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;
{
    if (retstack_ix == retstack_max) {
	retstack_max = retstack_max * 3 / 2;
	Renew(retstack, retstack_max, OP*);
    }
    retstack[retstack_ix++] = retop;
}

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

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

}

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

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

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

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

void
save_gp(gv, empty)
GV *gv;
I32 empty;
{
    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;
{
    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;
{
    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;
{
    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;
{
    SSCHECK(3);
    SSPUSHINT(*intp);
    SSPUSHPTR(intp);
    SSPUSHINT(SAVEt_INT);
}

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

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

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

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

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

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

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

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

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

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

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

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

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

void
save_list(sarg,maxsarg)
register SV **sarg;
I32 maxsarg;
{
    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;
{
    SSCHECK(3);
    SSPUSHDPTR(f);
    SSPUSHPTR(p);
    SSPUSHINT(SAVEt_DESTRUCTOR);
}

void
leave_scope(base)
I32 base;
{
    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;
	default:
	    croak("panic: leave_scope inconsistency");
	}
    }
}

#ifdef DEBUGGING

void
cx_dump(cx)
CONTEXT* cx;
{
    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**
	19	stack_grow(sp, p, n)
	20	SV** sp;
	21	SV** p;
	22	int n;
	23	{
	24	stack_sp = sp;
1f96a9ed	25	av_extend(curstack, (p - stack_base) + (n) + 128);
a0d0e21e	26	return stack_sp;
	27	}
	28
79072805	29	I32
	30	cxinc()
	31	{
	32	cxstack_max = cxstack_max * 3 / 2;
a38d6535	33	Renew(cxstack, cxstack_max + 1, CONTEXT); /* XXX should fix CXINC macro */
79072805	34	return cxstack_ix + 1;
	35	}
	36
	37	void
	38	push_return(retop)
	39	OP *retop;
	40	{
	41	if (retstack_ix == retstack_max) {
	42	retstack_max = retstack_max * 3 / 2;
	43	Renew(retstack, retstack_max, OP*);
	44	}
	45	retstack[retstack_ix++] = retop;
	46	}
	47
	48	OP *
	49	pop_return()
	50	{
	51	if (retstack_ix > 0)
	52	return retstack[--retstack_ix];
	53	else
	54	return Nullop;
	55	}
	56
	57	void
	58	push_scope()
	59	{
	60	if (scopestack_ix == scopestack_max) {
	61	scopestack_max = scopestack_max * 3 / 2;
	62	Renew(scopestack, scopestack_max, I32);
	63	}
	64	scopestack[scopestack_ix++] = savestack_ix;
	65
	66	}
	67
	68	void
	69	pop_scope()
	70	{
	71	I32 oldsave = scopestack[--scopestack_ix];
8990e307	72	LEAVE_SCOPE(oldsave);
79072805	73	}
	74
	75	void
a0d0e21e	76	markstack_grow()
	77	{
	78	I32 oldmax = markstack_max - markstack;
	79	I32 newmax = oldmax * 3 / 2;
	80
	81	Renew(markstack, newmax, I32);
	82	markstack_ptr = markstack + oldmax;
	83	markstack_max = markstack + newmax;
	84	}
	85
	86	void
79072805	87	savestack_grow()
	88	{
	89	savestack_max = savestack_max * 3 / 2;
	90	Renew(savestack, savestack_max, ANY);
	91	}
	92
	93	void
	94	free_tmps()
	95	{
	96	/* XXX should tmps_floor live in cxstack? */
	97	I32 myfloor = tmps_floor;
	98	while (tmps_ix > myfloor) { /* clean up after last statement */
	99	SV* sv = tmps_stack[tmps_ix];
	100	tmps_stack[tmps_ix--] = Nullsv;
463ee0b2	101	if (sv) {
	102	#ifdef DEBUGGING
	103	SvTEMP_off(sv);
	104	#endif
8990e307	105	SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
463ee0b2	106	}
79072805	107	}
	108	}
	109
7a4c00b4	110	static SV *
	111	save_scalar_at(sptr)
	112	SV **sptr;
79072805	113	{
79072805	114	register SV *sv;
7a4c00b4	115	SV osv = sptr;
79072805	116
7a4c00b4	117	sv = *sptr = NEWSV(0,0);
a0d0e21e	118	if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
79072805	119	sv_upgrade(sv, SvTYPE(osv));
a0d0e21e	120	if (SvGMAGICAL(osv)) {
748a9306	121	MAGIC* mg;
748a9306	122	bool oldtainted = tainted;
a0d0e21e	123	mg_get(osv);
748a9306	124	if (tainting && tainted && (mg = mg_find(osv, 't'))) {
	125	SAVESPTR(mg->mg_obj);
	126	mg->mg_obj = osv;
	127	}
a0d0e21e	128	SvFLAGS(osv) \|= (SvFLAGS(osv) &
a0d0e21e	129	(SVp_IOK\|SVp_NOK\|SVp_POK)) >> PRIVSHIFT;
748a9306	130	tainted = oldtainted;
a0d0e21e	131	}
79072805	132	SvMAGIC(sv) = SvMAGIC(osv);
a0d0e21e	133	SvFLAGS(sv) \|= SvMAGICAL(osv);
748a9306	134	localizing = 1;
79072805	135	SvSETMAGIC(sv);
748a9306	136	localizing = 0;
79072805	137	}
	138	return sv;
	139	}
	140
7a4c00b4	141	SV *
	142	save_scalar(gv)
	143	GV *gv;
	144	{
	145	SSCHECK(3);
	146	SSPUSHPTR(gv);
	147	SSPUSHPTR(GvSV(gv));
	148	SSPUSHINT(SAVEt_SV);
	149	return save_scalar_at(&GvSV(gv));
	150	}
	151
	152	SV*
	153	save_svref(sptr)
	154	SV **sptr;
	155	{
	156	SSCHECK(3);
	157	SSPUSHPTR(sptr);
	158	SSPUSHPTR(*sptr);
	159	SSPUSHINT(SAVEt_SVREF);
	160	return save_scalar_at(sptr);
	161	}
	162
79072805	163	void
5f05dabc	164	save_gp(gv, empty)
79072805	165	GV *gv;
5f05dabc	166	I32 empty;
79072805	167	{
fb73857a	168	SSCHECK(6);
	169	SSPUSHIV((IV)SvLEN(gv));
	170	SvLEN(gv) = 0; /* forget that anything was allocated here */
	171	SSPUSHIV((IV)SvCUR(gv));
	172	SSPUSHPTR(SvPVX(gv));
	173	SvPOK_off(gv);
4633a7c4	174	SSPUSHPTR(SvREFCNT_inc(gv));
5f05dabc	175	SSPUSHPTR(GvGP(gv));
79072805	176	SSPUSHINT(SAVEt_GP);
79072805	177
5f05dabc	178	if (empty) {
	179	register GP *gp;
	180	Newz(602, gp, 1, GP);
44a8e56a	181	GvGP(gv) = gp_ref(gp);
5f05dabc	182	GvSV(gv) = NEWSV(72,0);
	183	GvLINE(gv) = curcop->cop_line;
	184	GvEGV(gv) = gv;
	185	}
	186	else {
44a8e56a	187	gp_ref(GvGP(gv));
5f05dabc	188	GvINTRO_on(gv);
5f05dabc	189	}
79072805	190	}
79072805	191
79072805	192	AV *
	193	save_ary(gv)
	194	GV *gv;
	195	{
fb73857a	196	AV oav, av;
fb73857a	197
79072805	198	SSCHECK(3);
79072805	199	SSPUSHPTR(gv);
fb73857a	200	SSPUSHPTR(oav = GvAVn(gv));
79072805	201	SSPUSHINT(SAVEt_AV);
	202
	203	GvAV(gv) = Null(AV*);
fb73857a	204	av = GvAVn(gv);
	205	if (SvMAGIC(oav)) {
	206	SvMAGIC(av) = SvMAGIC(oav);
	207	SvFLAGS(av) \|= SvMAGICAL(oav);
	208	SvMAGICAL_off(oav);
	209	SvMAGIC(oav) = 0;
	210	localizing = 1;
	211	SvSETMAGIC((SV*)av);
	212	localizing = 0;
	213	}
	214	return av;
79072805	215	}
	216
	217	HV *
	218	save_hash(gv)
	219	GV *gv;
	220	{
fb73857a	221	HV ohv, hv;
fb73857a	222
79072805	223	SSCHECK(3);
79072805	224	SSPUSHPTR(gv);
fb73857a	225	SSPUSHPTR(ohv = GvHVn(gv));
79072805	226	SSPUSHINT(SAVEt_HV);
	227
	228	GvHV(gv) = Null(HV*);
fb73857a	229	hv = GvHVn(gv);
	230	if (SvMAGIC(ohv)) {
	231	SvMAGIC(hv) = SvMAGIC(ohv);
	232	SvFLAGS(hv) \|= SvMAGICAL(ohv);
	233	SvMAGICAL_off(ohv);
	234	SvMAGIC(ohv) = 0;
	235	localizing = 1;
	236	SvSETMAGIC((SV*)hv);
	237	localizing = 0;
	238	}
	239	return hv;
79072805	240	}
	241
	242	void
	243	save_item(item)
	244	register SV *item;
	245	{
	246	register SV *sv;
	247
	248	SSCHECK(3);
	249	SSPUSHPTR(item); /* remember the pointer */
	250	sv = NEWSV(0,0);
	251	sv_setsv(sv,item);
	252	SSPUSHPTR(sv); /* remember the value */
	253	SSPUSHINT(SAVEt_ITEM);
	254	}
	255
	256	void
	257	save_int(intp)
	258	int *intp;
	259	{
	260	SSCHECK(3);
	261	SSPUSHINT(*intp);
	262	SSPUSHPTR(intp);
	263	SSPUSHINT(SAVEt_INT);
	264	}
	265
	266	void
85e6fe83	267	save_long(longp)
	268	long *longp;
	269	{
	270	SSCHECK(3);
	271	SSPUSHLONG(*longp);
	272	SSPUSHPTR(longp);
	273	SSPUSHINT(SAVEt_LONG);
	274	}
	275
	276	void
79072805	277	save_I32(intp)
	278	I32 *intp;
	279	{
	280	SSCHECK(3);
	281	SSPUSHINT(*intp);
	282	SSPUSHPTR(intp);
	283	SSPUSHINT(SAVEt_I32);
	284	}
	285
a0d0e21e	286	void
55497cff	287	save_I16(intp)
	288	I16 *intp;
	289	{
	290	SSCHECK(3);
	291	SSPUSHINT(*intp);
	292	SSPUSHPTR(intp);
	293	SSPUSHINT(SAVEt_I16);
	294	}
	295
	296	void
a0d0e21e	297	save_iv(ivp)
	298	IV *ivp;
	299	{
	300	SSCHECK(3);
4aa0a1f7	301	SSPUSHIV(*ivp);
a0d0e21e	302	SSPUSHPTR(ivp);
	303	SSPUSHINT(SAVEt_IV);
	304	}
	305
85e6fe83	306	/* Cannot use save_sptr() to store a char* since the SV** cast will
	307	* force word-alignment and we'll miss the pointer.
	308	*/
	309	void
	310	save_pptr(pptr)
	311	char **pptr;
	312	{
	313	SSCHECK(3);
	314	SSPUSHPTR(*pptr);
	315	SSPUSHPTR(pptr);
	316	SSPUSHINT(SAVEt_PPTR);
	317	}
	318
79072805	319	void
	320	save_sptr(sptr)
	321	SV **sptr;
	322	{
	323	SSCHECK(3);
	324	SSPUSHPTR(*sptr);
	325	SSPUSHPTR(sptr);
	326	SSPUSHINT(SAVEt_SPTR);
	327	}
	328
	329	void
	330	save_nogv(gv)
	331	GV *gv;
	332	{
	333	SSCHECK(2);
	334	SSPUSHPTR(gv);
	335	SSPUSHINT(SAVEt_NSTAB);
	336	}
	337
	338	void
	339	save_hptr(hptr)
	340	HV **hptr;
	341	{
	342	SSCHECK(3);
85e6fe83	343	SSPUSHPTR(*hptr);
79072805	344	SSPUSHPTR(hptr);
	345	SSPUSHINT(SAVEt_HPTR);
	346	}
	347
	348	void
	349	save_aptr(aptr)
	350	AV **aptr;
	351	{
	352	SSCHECK(3);
85e6fe83	353	SSPUSHPTR(*aptr);
79072805	354	SSPUSHPTR(aptr);
	355	SSPUSHINT(SAVEt_APTR);
	356	}
	357
	358	void
8990e307	359	save_freesv(sv)
	360	SV *sv;
	361	{
	362	SSCHECK(2);
	363	SSPUSHPTR(sv);
	364	SSPUSHINT(SAVEt_FREESV);
	365	}
	366
	367	void
	368	save_freeop(op)
	369	OP *op;
	370	{
	371	SSCHECK(2);
	372	SSPUSHPTR(op);
	373	SSPUSHINT(SAVEt_FREEOP);
	374	}
	375
	376	void
	377	save_freepv(pv)
	378	char *pv;
	379	{
	380	SSCHECK(2);
	381	SSPUSHPTR(pv);
	382	SSPUSHINT(SAVEt_FREEPV);
	383	}
	384
	385	void
	386	save_clearsv(svp)
	387	SV** svp;
	388	{
	389	SSCHECK(2);
4aa0a1f7	390	SSPUSHLONG((long)(svp-curpad));
8990e307	391	SSPUSHINT(SAVEt_CLEARSV);
	392	}
	393
	394	void
	395	save_delete(hv,key,klen)
	396	HV *hv;
	397	char *key;
	398	I32 klen;
	399	{
	400	SSCHECK(4);
	401	SSPUSHINT(klen);
	402	SSPUSHPTR(key);
	403	SSPUSHPTR(hv);
	404	SSPUSHINT(SAVEt_DELETE);
	405	}
	406
	407	void
79072805	408	save_list(sarg,maxsarg)
	409	register SV **sarg;
	410	I32 maxsarg;
	411	{
	412	register SV *sv;
	413	register I32 i;
	414
	415	SSCHECK(3 * maxsarg);
	416	for (i = 1; i <= maxsarg; i++) {
	417	SSPUSHPTR(sarg[i]); /* remember the pointer */
	418	sv = NEWSV(0,0);
	419	sv_setsv(sv,sarg[i]);
	420	SSPUSHPTR(sv); /* remember the value */
	421	SSPUSHINT(SAVEt_ITEM);
	422	}
	423	}
	424
	425	void
a0d0e21e	426	save_destructor(f,p)
	427	void (f) _((void));
	428	void* p;
	429	{
	430	SSCHECK(3);
	431	SSPUSHDPTR(f);
	432	SSPUSHPTR(p);
	433	SSPUSHINT(SAVEt_DESTRUCTOR);
	434	}
	435
	436	void
79072805	437	leave_scope(base)
	438	I32 base;
	439	{
	440	register SV *sv;
	441	register SV *value;
	442	register GV *gv;
	443	register AV *av;
	444	register HV *hv;
	445	register void* ptr;
	446
	447	if (base < -1)
463ee0b2	448	croak("panic: corrupt saved stack index");
79072805	449	while (savestack_ix > base) {
	450	switch (SSPOPINT) {
	451	case SAVEt_ITEM: /* normal string */
	452	value = (SV*)SSPOPPTR;
	453	sv = (SV*)SSPOPPTR;
	454	sv_replace(sv,value);
748a9306	455	localizing = 2;
79072805	456	SvSETMAGIC(sv);
748a9306	457	localizing = 0;
79072805	458	break;
	459	case SAVEt_SV: /* scalar reference */
	460	value = (SV*)SSPOPPTR;
	461	gv = (GV*)SSPOPPTR;
7a4c00b4	462	ptr = &GvSV(gv);
7a4c00b4	463	goto restore_sv;
79072805	464	case SAVEt_SVREF: /* scalar reference */
7a4c00b4	465	value = (SV*)SSPOPPTR;
79072805	466	ptr = SSPOPPTR;
7a4c00b4	467	restore_sv:
79072805	468	sv = (SV*)ptr;
748a9306	469	if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
	470	SvTYPE(sv) != SVt_PVGV)
	471	{
a0d0e21e	472	(void)SvUPGRADE(value, SvTYPE(sv));
	473	SvMAGIC(value) = SvMAGIC(sv);
	474	SvFLAGS(value) \|= SvMAGICAL(sv);
	475	SvMAGICAL_off(sv);
79072805	476	SvMAGIC(sv) = 0;
a0d0e21e	477	}
7a4c00b4	478	else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) &&
	479	SvTYPE(value) != SVt_PVGV)
	480	{
	481	SvFLAGS(value) \|= (SvFLAGS(value) &
	482	(SVp_IOK\|SVp_NOK\|SVp_POK)) >> PRIVSHIFT;
	483	SvMAGICAL_off(value);
	484	SvMAGIC(value) = 0;
	485	}
8990e307	486	SvREFCNT_dec(sv);
a0d0e21e	487	(SV*)ptr = value;
748a9306	488	localizing = 2;
a0d0e21e	489	SvSETMAGIC(value);
748a9306	490	localizing = 0;
79072805	491	break;
	492	case SAVEt_AV: /* array reference */
	493	av = (AV*)SSPOPPTR;
	494	gv = (GV*)SSPOPPTR;
fb73857a	495	if (GvAV(gv)) {
	496	AV *goner = GvAV(gv);
	497	SvMAGIC(av) = SvMAGIC(goner);
	498	SvFLAGS(av) \|= SvMAGICAL(goner);
	499	SvMAGICAL_off(goner);
	500	SvMAGIC(goner) = 0;
	501	SvREFCNT_dec(goner);
	502	}
79072805	503	GvAV(gv) = av;
fb73857a	504	if (SvMAGICAL(av)) {
	505	localizing = 2;
	506	SvSETMAGIC((SV*)av);
	507	localizing = 0;
	508	}
79072805	509	break;
	510	case SAVEt_HV: /* hash reference */
	511	hv = (HV*)SSPOPPTR;
	512	gv = (GV*)SSPOPPTR;
fb73857a	513	if (GvHV(gv)) {
	514	HV *goner = GvHV(gv);
	515	SvMAGIC(hv) = SvMAGIC(goner);
	516	SvFLAGS(hv) \|= SvMAGICAL(goner);
	517	SvMAGICAL_off(goner);
	518	SvMAGIC(goner) = 0;
	519	SvREFCNT_dec(goner);
	520	}
79072805	521	GvHV(gv) = hv;
fb73857a	522	if (SvMAGICAL(hv)) {
	523	localizing = 2;
	524	SvSETMAGIC((SV*)hv);
	525	localizing = 0;
	526	}
79072805	527	break;
	528	case SAVEt_INT: /* int reference */
	529	ptr = SSPOPPTR;
	530	(int)ptr = (int)SSPOPINT;
	531	break;
85e6fe83	532	case SAVEt_LONG: /* long reference */
	533	ptr = SSPOPPTR;
	534	(long)ptr = (long)SSPOPLONG;
	535	break;
79072805	536	case SAVEt_I32: /* I32 reference */
	537	ptr = SSPOPPTR;
	538	(I32)ptr = (I32)SSPOPINT;
	539	break;
55497cff	540	case SAVEt_I16: /* I16 reference */
	541	ptr = SSPOPPTR;
	542	(I16)ptr = (I16)SSPOPINT;
	543	break;
a0d0e21e	544	case SAVEt_IV: /* IV reference */
	545	ptr = SSPOPPTR;
	546	(IV)ptr = (IV)SSPOPIV;
	547	break;
79072805	548	case SAVEt_SPTR: /* SV* reference */
	549	ptr = SSPOPPTR;
	550	(SV)ptr = (SV)SSPOPPTR;
	551	break;
85e6fe83	552	case SAVEt_PPTR: /* char* reference */
	553	ptr = SSPOPPTR;
	554	(char)ptr = (char)SSPOPPTR;
	555	break;
79072805	556	case SAVEt_HPTR: /* HV* reference */
	557	ptr = SSPOPPTR;
	558	(HV)ptr = (HV)SSPOPPTR;
	559	break;
	560	case SAVEt_APTR: /* AV* reference */
	561	ptr = SSPOPPTR;
	562	(AV)ptr = (AV)SSPOPPTR;
	563	break;
	564	case SAVEt_NSTAB:
	565	gv = (GV*)SSPOPPTR;
1f96a9ed	566	(void)sv_clear((SV*)gv);
79072805	567	break;
fb73857a	568	case SAVEt_GP: /* scalar reference */
79072805	569	ptr = SSPOPPTR;
	570	gv = (GV*)SSPOPPTR;
	571	gp_free(gv);
	572	GvGP(gv) = (GP*)ptr;
fb73857a	573	if (SvPOK(gv) && SvLEN(gv) > 0) {
	574	Safefree(SvPVX(gv));
	575	}
	576	SvPVX(gv) = (char *)SSPOPPTR;
	577	SvCUR(gv) = (STRLEN)SSPOPIV;
	578	SvLEN(gv) = (STRLEN)SSPOPIV;
4633a7c4	579	SvREFCNT_dec(gv);
79072805	580	break;
8990e307	581	case SAVEt_FREESV:
	582	ptr = SSPOPPTR;
	583	SvREFCNT_dec((SV*)ptr);
	584	break;
	585	case SAVEt_FREEOP:
	586	ptr = SSPOPPTR;
46fc3d4c	587	if (comppad)
46fc3d4c	588	curpad = AvARRAY(comppad);
8990e307	589	op_free((OP*)ptr);
	590	break;
	591	case SAVEt_FREEPV:
	592	ptr = SSPOPPTR;
	593	Safefree((char*)ptr);
	594	break;
	595	case SAVEt_CLEARSV:
4aa0a1f7	596	ptr = (void*)&curpad[SSPOPLONG];
8990e307	597	sv = (SV*)ptr;
bc44cdaf	598	/* Can clear pad variable in place? */
bc44cdaf	599	if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
8990e307	600	if (SvTHINKFIRST(sv)) {
	601	if (SvREADONLY(sv))
	602	croak("panic: leave_scope clearsv");
	603	if (SvROK(sv))
	604	sv_unref(sv);
	605	}
a0d0e21e	606	if (SvMAGICAL(sv))
a0d0e21e	607	mg_free(sv);
8990e307	608
	609	switch (SvTYPE(sv)) {
	610	case SVt_NULL:
	611	break;
	612	case SVt_PVAV:
44a8e56a	613	av_clear((AV*)sv);
8990e307	614	break;
8990e307	615	case SVt_PVHV:
44a8e56a	616	hv_clear((HV*)sv);
8990e307	617	break;
8990e307	618	case SVt_PVCV:
5377b701	619	croak("panic: leave_scope pad code");
	620	case SVt_RV:
	621	case SVt_IV:
	622	case SVt_NV:
	623	(void)SvOK_off(sv);
8990e307	624	break;
8990e307	625	default:
a0d0e21e	626	(void)SvOK_off(sv);
5377b701	627	(void)SvOOK_off(sv);
8990e307	628	break;
	629	}
	630	}
	631	else { /* Someone has a claim on this, so abandon it. */
4aa0a1f7	632	U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY\|SVs_PADMY\|SVs_PADTMP);
8990e307	633	SvREFCNT_dec(sv); /* Cast current value to the winds. */
	634	switch (SvTYPE(sv)) { /* Console ourselves with a new value */
	635	case SVt_PVAV: (SV)ptr = (SV)newAV(); break;
	636	case SVt_PVHV: (SV)ptr = (SV)newHV(); break;
	637	default: (SV*)ptr = NEWSV(0,0); break;
	638	}
4aa0a1f7	639	SvFLAGS((SV)ptr) \|= padflags; / preserve pad nature */
8990e307	640	}
	641	break;
	642	case SAVEt_DELETE:
	643	ptr = SSPOPPTR;
	644	hv = (HV*)ptr;
	645	ptr = SSPOPPTR;
748a9306	646	(void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
adbc6bb1	647	Safefree(ptr);
8990e307	648	break;
a0d0e21e	649	case SAVEt_DESTRUCTOR:
	650	ptr = SSPOPPTR;
	651	(*SSPOPDPTR)(ptr);
	652	break;
	653	case SAVEt_REGCONTEXT:
8e07c86e	654	{
	655	I32 delta = SSPOPINT;
	656	savestack_ix -= delta; /* regexp must have croaked */
	657	}
a0d0e21e	658	break;
55497cff	659	case SAVEt_STACK_POS: /* Position on Perl stack */
	660	{
	661	I32 delta = SSPOPINT;
	662	stack_sp = stack_base + delta;
	663	}
	664	break;
79072805	665	default:
463ee0b2	666	croak("panic: leave_scope inconsistency");
79072805	667	}
	668	}
	669	}
8990e307	670
8990e307	671	#ifdef DEBUGGING
1f96a9ed	672
8990e307	673	void
	674	cx_dump(cx)
	675	CONTEXT* cx;
	676	{
fb73857a	677	PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), block_type[cx->cx_type]);
8990e307	678	if (cx->cx_type != CXt_SUBST) {
760ac839	679	PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
	680	PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
	681	PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
	682	PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
	683	PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
	684	PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
	685	PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
8990e307	686	}
	687	switch (cx->cx_type) {
	688	case CXt_NULL:
	689	case CXt_BLOCK:
	690	break;
	691	case CXt_SUB:
760ac839	692	PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%lx\n",
8990e307	693	(long)cx->blk_sub.cv);
760ac839	694	PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%lx\n",
8990e307	695	(long)cx->blk_sub.gv);
760ac839	696	PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%lx\n",
8990e307	697	(long)cx->blk_sub.dfoutgv);
760ac839	698	PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
8990e307	699	(long)cx->blk_sub.olddepth);
760ac839	700	PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
8990e307	701	(int)cx->blk_sub.hasargs);
	702	break;
	703	case CXt_EVAL:
760ac839	704	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
8990e307	705	(long)cx->blk_eval.old_in_eval);
760ac839	706	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
c07a80fd	707	op_name[cx->blk_eval.old_op_type],
c07a80fd	708	op_desc[cx->blk_eval.old_op_type]);
760ac839	709	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
8990e307	710	cx->blk_eval.old_name);
760ac839	711	PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
8990e307	712	(long)cx->blk_eval.old_eval_root);
	713	break;
	714
	715	case CXt_LOOP:
760ac839	716	PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n",
8990e307	717	cx->blk_loop.label);
760ac839	718	PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n",
8990e307	719	(long)cx->blk_loop.resetsp);
760ac839	720	PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%lx\n",
8990e307	721	(long)cx->blk_loop.redo_op);
760ac839	722	PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%lx\n",
8990e307	723	(long)cx->blk_loop.next_op);
760ac839	724	PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%lx\n",
8990e307	725	(long)cx->blk_loop.last_op);
760ac839	726	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
8990e307	727	(long)cx->blk_loop.iterix);
760ac839	728	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%lx\n",
8990e307	729	(long)cx->blk_loop.iterary);
760ac839	730	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%lx\n",
8990e307	731	(long)cx->blk_loop.itervar);
8990e307	732	if (cx->blk_loop.itervar)
760ac839	733	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%lx\n",
8990e307	734	(long)cx->blk_loop.itersave);
7a4c00b4	735	PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%lx\n",
7a4c00b4	736	(long)cx->blk_loop.iterlval);
8990e307	737	break;
	738
	739	case CXt_SUBST:
760ac839	740	PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
8990e307	741	(long)cx->sb_iters);
760ac839	742	PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
8990e307	743	(long)cx->sb_maxiters);
760ac839	744	PerlIO_printf(Perl_debug_log, "SB_SAFEBASE = %ld\n",
8990e307	745	(long)cx->sb_safebase);
760ac839	746	PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
8990e307	747	(long)cx->sb_once);
760ac839	748	PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
8990e307	749	cx->sb_orig);
760ac839	750	PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%lx\n",
8990e307	751	(long)cx->sb_dstr);
760ac839	752	PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%lx\n",
8990e307	753	(long)cx->sb_targ);
760ac839	754	PerlIO_printf(Perl_debug_log, "SB_S = 0x%lx\n",
8990e307	755	(long)cx->sb_s);
760ac839	756	PerlIO_printf(Perl_debug_log, "SB_M = 0x%lx\n",
8990e307	757	(long)cx->sb_m);
760ac839	758	PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%lx\n",
8990e307	759	(long)cx->sb_strend);
c90c0ff4	760	PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%lx\n",
c90c0ff4	761	(long)cx->sb_rxres);
8990e307	762	break;
	763	}
	764	}
	765	#endif