[perl5.git] / scope.c

/*    scope.c
 *
 *    Copyright (c) 1991-1994, 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(stack, (p - stack_base) + (n) + 128);
    return stack_sp;
}

I32
cxinc()
{
    cxstack_max = cxstack_max * 3 / 2;
    Renew(cxstack, cxstack_max, CONTEXT);
    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!!! */
	}
    }
}

SV *
save_scalar(gv)
GV *gv;
{
    register SV *sv;
    SV *osv = GvSV(gv);

    SSCHECK(3);
    SSPUSHPTR(gv);
    SSPUSHPTR(osv);
    SSPUSHINT(SAVEt_SV);

    sv = GvSV(gv) = 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;
}

#ifdef INLINED_ELSEWHERE
void
save_gp(gv)
GV *gv;
{
    register GP *gp;
    GP *ogp = GvGP(gv);

    SSCHECK(3);
    SSPUSHPTR(gv);
    SSPUSHPTR(ogp);
    SSPUSHINT(SAVEt_GP);

    Newz(602,gp, 1, GP);
    GvGP(gv) = gp;
    GvREFCNT(gv) = 1;
    GvSV(gv) = NEWSV(72,0);
    GvLINE(gv) = curcop->cop_line;
    GvEGV(gv) = gv;
}
#endif

SV*
save_svref(sptr)
SV **sptr;
{
    register SV *sv;
    SV *osv = *sptr;

    SSCHECK(3);
    SSPUSHPTR(*sptr);
    SSPUSHPTR(sptr);
    SSPUSHINT(SAVEt_SVREF);

    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;
}

AV *
save_ary(gv)
GV *gv;
{
    SSCHECK(3);
    SSPUSHPTR(gv);
    SSPUSHPTR(GvAVn(gv));
    SSPUSHINT(SAVEt_AV);

    GvAV(gv) = Null(AV*);
    return GvAVn(gv);
}

HV *
save_hash(gv)
GV *gv;
{
    SSCHECK(3);
    SSPUSHPTR(gv);
    SSPUSHPTR(GvHVn(gv));
    SSPUSHINT(SAVEt_HV);

    GvHV(gv) = Null(HV*);
    return GvHVn(gv);
}

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_iv(ivp)
IV *ivp;
{
    SSCHECK(3);
    SSPUSHINT(*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);
    SSPUSHPTR(svp);
    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;
	    sv = GvSV(gv);
	    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;
	    }
            SvREFCNT_dec(sv);
            GvSV(gv) = value;
	    localizing = 2;
	    SvSETMAGIC(value);
	    localizing = 0;
            break;
        case SAVEt_SVREF:			/* scalar reference */
	    ptr = SSPOPPTR;
	    sv = *(SV**)ptr;
	    value = (SV*)SSPOPPTR;
	    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;
	    }
            SvREFCNT_dec(sv);
	    *(SV**)ptr = value;
	    localizing = 2;
	    SvSETMAGIC(value);
	    localizing = 0;
            break;
        case SAVEt_AV:				/* array reference */
	    av = (AV*)SSPOPPTR;
	    gv = (GV*)SSPOPPTR;
            SvREFCNT_dec(GvAV(gv));
            GvAV(gv) = av;
            break;
        case SAVEt_HV:				/* hash reference */
	    hv = (HV*)SSPOPPTR;
	    gv = (GV*)SSPOPPTR;
            SvREFCNT_dec(GvHV(gv));
            GvHV(gv) = hv;
            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_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(gv);
	    break;
        case SAVEt_GP:				/* scalar reference */
	    ptr = SSPOPPTR;
	    gv = (GV*)SSPOPPTR;
            gp_free(gv);
            GvGP(gv) = (GP*)ptr;
            break;
	case SAVEt_FREESV:
	    ptr = SSPOPPTR;
	    SvREFCNT_dec((SV*)ptr);
	    break;
	case SAVEt_FREEOP:
	    ptr = SSPOPPTR;
	    curpad = AvARRAY(comppad);
	    op_free((OP*)ptr);
	    break;
	case SAVEt_FREEPV:
	    ptr = SSPOPPTR;
	    Safefree((char*)ptr);
	    break;
	case SAVEt_CLEARSV:
	    ptr = SSPOPPTR;
	    sv = *(SV**)ptr;
	    if (SvREFCNT(sv) <= 1) { /* Can clear pad variable in place. */
		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:
		    sub_generation++;
		    cv_undef((CV*)sv);
		    break;
		default:
		    if (SvPOK(sv) && SvLEN(sv))
			(void)SvOOK_off(sv);
		    (void)SvOK_off(sv);
		    break;
		}
	    }
	    else {	/* Someone has a claim on this, so abandon it. */
		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;
		}
	    }
	    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:
	    savestack_ix -= SSPOPINT;	/* regexp must have croaked */
	    break;
	default:
	    croak("panic: leave_scope inconsistency");
	}
    }
}

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

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

    case CXt_SUBST:
	fprintf(stderr, "SB_ITERS = %ld\n",
		(long)cx->sb_iters);
	fprintf(stderr, "SB_MAXITERS = %ld\n",
		(long)cx->sb_maxiters);
	fprintf(stderr, "SB_SAFEBASE = %ld\n",
		(long)cx->sb_safebase);
	fprintf(stderr, "SB_ONCE = %ld\n",
		(long)cx->sb_once);
	fprintf(stderr, "SB_ORIG = %s\n",
		cx->sb_orig);
	fprintf(stderr, "SB_DSTR = 0x%lx\n",
		(long)cx->sb_dstr);
	fprintf(stderr, "SB_TARG = 0x%lx\n",
		(long)cx->sb_targ);
	fprintf(stderr, "SB_S = 0x%lx\n",
		(long)cx->sb_s);
	fprintf(stderr, "SB_M = 0x%lx\n",
		(long)cx->sb_m);
	fprintf(stderr, "SB_STREND = 0x%lx\n",
		(long)cx->sb_strend);
	fprintf(stderr, "SB_SUBBASE = 0x%lx\n",
		(long)cx->sb_subbase);
	break;
    }
}
#endif
Commit	Line	Data
a0d0e21e	1	/* scope.c
79072805	2	*
a0d0e21e	3	* Copyright (c) 1991-1994, 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	{
	24	stack_sp = sp;
	25	av_extend(stack, (p - stack_base) + (n) + 128);
a0d0e21e LW	26	return stack_sp;
	27	}
	28
79072805 LW	29	I32
	30	cxinc()
	31	{
	32	cxstack_max = cxstack_max * 3 / 2;
	33	Renew(cxstack, cxstack_max, CONTEXT);
	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 LW	73	}
	74
	75	void
a0d0e21e LW	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 LW	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 LW	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 LW	107	}
	108	}
	109
	110	SV *
	111	save_scalar(gv)
	112	GV *gv;
	113	{
	114	register SV *sv;
	115	SV *osv = GvSV(gv);
	116
	117	SSCHECK(3);
	118	SSPUSHPTR(gv);
	119	SSPUSHPTR(osv);
	120	SSPUSHINT(SAVEt_SV);
	121
	122	sv = GvSV(gv) = NEWSV(0,0);
a0d0e21e	123	if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
79072805	124	sv_upgrade(sv, SvTYPE(osv));
a0d0e21e	125	if (SvGMAGICAL(osv)) {
748a9306 LW	126	MAGIC* mg;
748a9306 LW	127	bool oldtainted = tainted;
a0d0e21e	128	mg_get(osv);
748a9306 LW	129	if (tainting && tainted && (mg = mg_find(osv, 't'))) {
	130	SAVESPTR(mg->mg_obj);
	131	mg->mg_obj = osv;
	132	}
a0d0e21e LW	133	SvFLAGS(osv) \|= (SvFLAGS(osv) &
a0d0e21e LW	134	(SVp_IOK\|SVp_NOK\|SVp_POK)) >> PRIVSHIFT;
748a9306	135	tainted = oldtainted;
a0d0e21e	136	}
79072805	137	SvMAGIC(sv) = SvMAGIC(osv);
a0d0e21e	138	SvFLAGS(sv) \|= SvMAGICAL(osv);
748a9306	139	localizing = 1;
79072805	140	SvSETMAGIC(sv);
748a9306	141	localizing = 0;
79072805 LW	142	}
	143	return sv;
	144	}
	145
	146	#ifdef INLINED_ELSEWHERE
	147	void
	148	save_gp(gv)
	149	GV *gv;
	150	{
	151	register GP *gp;
	152	GP *ogp = GvGP(gv);
	153
	154	SSCHECK(3);
	155	SSPUSHPTR(gv);
	156	SSPUSHPTR(ogp);
	157	SSPUSHINT(SAVEt_GP);
	158
	159	Newz(602,gp, 1, GP);
	160	GvGP(gv) = gp;
	161	GvREFCNT(gv) = 1;
	162	GvSV(gv) = NEWSV(72,0);
	163	GvLINE(gv) = curcop->cop_line;
	164	GvEGV(gv) = gv;
	165	}
	166	#endif
	167
	168	SV*
	169	save_svref(sptr)
	170	SV **sptr;
	171	{
	172	register SV *sv;
	173	SV osv = sptr;
	174
	175	SSCHECK(3);
	176	SSPUSHPTR(*sptr);
	177	SSPUSHPTR(sptr);
	178	SSPUSHINT(SAVEt_SVREF);
	179
	180	sv = *sptr = NEWSV(0,0);
a0d0e21e	181	if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
79072805	182	sv_upgrade(sv, SvTYPE(osv));
a0d0e21e	183	if (SvGMAGICAL(osv)) {
748a9306 LW	184	MAGIC* mg;
748a9306 LW	185	bool oldtainted = tainted;
a0d0e21e	186	mg_get(osv);
748a9306 LW	187	if (tainting && tainted && (mg = mg_find(osv, 't'))) {
	188	SAVESPTR(mg->mg_obj);
	189	mg->mg_obj = osv;
	190	}
a0d0e21e LW	191	SvFLAGS(osv) \|= (SvFLAGS(osv) &
a0d0e21e LW	192	(SVp_IOK\|SVp_NOK\|SVp_POK)) >> PRIVSHIFT;
748a9306	193	tainted = oldtainted;
a0d0e21e	194	}
79072805	195	SvMAGIC(sv) = SvMAGIC(osv);
a0d0e21e	196	SvFLAGS(sv) \|= SvMAGICAL(osv);
748a9306	197	localizing = 1;
79072805	198	SvSETMAGIC(sv);
748a9306	199	localizing = 0;
79072805 LW	200	}
	201	return sv;
	202	}
	203
	204	AV *
	205	save_ary(gv)
	206	GV *gv;
	207	{
	208	SSCHECK(3);
	209	SSPUSHPTR(gv);
	210	SSPUSHPTR(GvAVn(gv));
	211	SSPUSHINT(SAVEt_AV);
	212
	213	GvAV(gv) = Null(AV*);
	214	return GvAVn(gv);
	215	}
	216
	217	HV *
	218	save_hash(gv)
	219	GV *gv;
	220	{
	221	SSCHECK(3);
	222	SSPUSHPTR(gv);
	223	SSPUSHPTR(GvHVn(gv));
	224	SSPUSHINT(SAVEt_HV);
	225
	226	GvHV(gv) = Null(HV*);
	227	return GvHVn(gv);
	228	}
	229
	230	void
	231	save_item(item)
	232	register SV *item;
	233	{
	234	register SV *sv;
	235
	236	SSCHECK(3);
	237	SSPUSHPTR(item); /* remember the pointer */
	238	sv = NEWSV(0,0);
	239	sv_setsv(sv,item);
	240	SSPUSHPTR(sv); /* remember the value */
	241	SSPUSHINT(SAVEt_ITEM);
	242	}
	243
	244	void
	245	save_int(intp)
	246	int *intp;
	247	{
	248	SSCHECK(3);
	249	SSPUSHINT(*intp);
	250	SSPUSHPTR(intp);
	251	SSPUSHINT(SAVEt_INT);
	252	}
	253
	254	void
85e6fe83 LW	255	save_long(longp)
	256	long *longp;
	257	{
	258	SSCHECK(3);
	259	SSPUSHLONG(*longp);
	260	SSPUSHPTR(longp);
	261	SSPUSHINT(SAVEt_LONG);
	262	}
	263
	264	void
79072805 LW	265	save_I32(intp)
	266	I32 *intp;
	267	{
	268	SSCHECK(3);
	269	SSPUSHINT(*intp);
	270	SSPUSHPTR(intp);
	271	SSPUSHINT(SAVEt_I32);
	272	}
	273
a0d0e21e LW	274	void
	275	save_iv(ivp)
	276	IV *ivp;
	277	{
	278	SSCHECK(3);
	279	SSPUSHINT(*ivp);
	280	SSPUSHPTR(ivp);
	281	SSPUSHINT(SAVEt_IV);
	282	}
	283
85e6fe83 LW	284	/* Cannot use save_sptr() to store a char* since the SV** cast will
	285	* force word-alignment and we'll miss the pointer.
	286	*/
	287	void
	288	save_pptr(pptr)
	289	char **pptr;
	290	{
	291	SSCHECK(3);
	292	SSPUSHPTR(*pptr);
	293	SSPUSHPTR(pptr);
	294	SSPUSHINT(SAVEt_PPTR);
	295	}
	296
79072805 LW	297	void
	298	save_sptr(sptr)
	299	SV **sptr;
	300	{
	301	SSCHECK(3);
	302	SSPUSHPTR(*sptr);
	303	SSPUSHPTR(sptr);
	304	SSPUSHINT(SAVEt_SPTR);
	305	}
	306
	307	void
	308	save_nogv(gv)
	309	GV *gv;
	310	{
	311	SSCHECK(2);
	312	SSPUSHPTR(gv);
	313	SSPUSHINT(SAVEt_NSTAB);
	314	}
	315
	316	void
	317	save_hptr(hptr)
	318	HV **hptr;
	319	{
	320	SSCHECK(3);
85e6fe83	321	SSPUSHPTR(*hptr);
79072805 LW	322	SSPUSHPTR(hptr);
	323	SSPUSHINT(SAVEt_HPTR);
	324	}
	325
	326	void
	327	save_aptr(aptr)
	328	AV **aptr;
	329	{
	330	SSCHECK(3);
85e6fe83	331	SSPUSHPTR(*aptr);
79072805 LW	332	SSPUSHPTR(aptr);
	333	SSPUSHINT(SAVEt_APTR);
	334	}
	335
	336	void
8990e307 LW	337	save_freesv(sv)
	338	SV *sv;
	339	{
	340	SSCHECK(2);
	341	SSPUSHPTR(sv);
	342	SSPUSHINT(SAVEt_FREESV);
	343	}
	344
	345	void
	346	save_freeop(op)
	347	OP *op;
	348	{
	349	SSCHECK(2);
	350	SSPUSHPTR(op);
	351	SSPUSHINT(SAVEt_FREEOP);
	352	}
	353
	354	void
	355	save_freepv(pv)
	356	char *pv;
	357	{
	358	SSCHECK(2);
	359	SSPUSHPTR(pv);
	360	SSPUSHINT(SAVEt_FREEPV);
	361	}
	362
	363	void
	364	save_clearsv(svp)
	365	SV** svp;
	366	{
	367	SSCHECK(2);
	368	SSPUSHPTR(svp);
	369	SSPUSHINT(SAVEt_CLEARSV);
	370	}
	371
	372	void
	373	save_delete(hv,key,klen)
	374	HV *hv;
	375	char *key;
	376	I32 klen;
	377	{
	378	SSCHECK(4);
	379	SSPUSHINT(klen);
	380	SSPUSHPTR(key);
	381	SSPUSHPTR(hv);
	382	SSPUSHINT(SAVEt_DELETE);
	383	}
	384
	385	void
79072805 LW	386	save_list(sarg,maxsarg)
	387	register SV **sarg;
	388	I32 maxsarg;
	389	{
	390	register SV *sv;
	391	register I32 i;
	392
	393	SSCHECK(3 * maxsarg);
	394	for (i = 1; i <= maxsarg; i++) {
	395	SSPUSHPTR(sarg[i]); /* remember the pointer */
	396	sv = NEWSV(0,0);
	397	sv_setsv(sv,sarg[i]);
	398	SSPUSHPTR(sv); /* remember the value */
	399	SSPUSHINT(SAVEt_ITEM);
	400	}
	401	}
	402
	403	void
a0d0e21e LW	404	save_destructor(f,p)
	405	void (f) _((void));
	406	void* p;
	407	{
	408	SSCHECK(3);
	409	SSPUSHDPTR(f);
	410	SSPUSHPTR(p);
	411	SSPUSHINT(SAVEt_DESTRUCTOR);
	412	}
	413
	414	void
79072805 LW	415	leave_scope(base)
	416	I32 base;
	417	{
	418	register SV *sv;
	419	register SV *value;
	420	register GV *gv;
	421	register AV *av;
	422	register HV *hv;
	423	register void* ptr;
	424
	425	if (base < -1)
463ee0b2	426	croak("panic: corrupt saved stack index");
79072805 LW	427	while (savestack_ix > base) {
	428	switch (SSPOPINT) {
	429	case SAVEt_ITEM: /* normal string */
	430	value = (SV*)SSPOPPTR;
	431	sv = (SV*)SSPOPPTR;
	432	sv_replace(sv,value);
748a9306	433	localizing = 2;
79072805	434	SvSETMAGIC(sv);
748a9306	435	localizing = 0;
79072805 LW	436	break;
	437	case SAVEt_SV: /* scalar reference */
	438	value = (SV*)SSPOPPTR;
	439	gv = (GV*)SSPOPPTR;
	440	sv = GvSV(gv);
748a9306 LW	441	if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
	442	SvTYPE(sv) != SVt_PVGV)
	443	{
a0d0e21e	444	(void)SvUPGRADE(value, SvTYPE(sv));
85e6fe83	445	SvMAGIC(value) = SvMAGIC(sv);
a0d0e21e LW	446	SvFLAGS(value) \|= SvMAGICAL(sv);
a0d0e21e LW	447	SvMAGICAL_off(sv);
79072805	448	SvMAGIC(sv) = 0;
85e6fe83	449	}
8990e307	450	SvREFCNT_dec(sv);
a0d0e21e	451	GvSV(gv) = value;
748a9306	452	localizing = 2;
a0d0e21e	453	SvSETMAGIC(value);
748a9306	454	localizing = 0;
79072805 LW	455	break;
	456	case SAVEt_SVREF: /* scalar reference */
	457	ptr = SSPOPPTR;
	458	sv = (SV*)ptr;
a0d0e21e	459	value = (SV*)SSPOPPTR;
748a9306 LW	460	if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
	461	SvTYPE(sv) != SVt_PVGV)
	462	{
a0d0e21e LW	463	(void)SvUPGRADE(value, SvTYPE(sv));
	464	SvMAGIC(value) = SvMAGIC(sv);
	465	SvFLAGS(value) \|= SvMAGICAL(sv);
	466	SvMAGICAL_off(sv);
79072805	467	SvMAGIC(sv) = 0;
a0d0e21e	468	}
8990e307	469	SvREFCNT_dec(sv);
a0d0e21e	470	(SV*)ptr = value;
748a9306	471	localizing = 2;
a0d0e21e	472	SvSETMAGIC(value);
748a9306	473	localizing = 0;
79072805 LW	474	break;
	475	case SAVEt_AV: /* array reference */
	476	av = (AV*)SSPOPPTR;
	477	gv = (GV*)SSPOPPTR;
8990e307	478	SvREFCNT_dec(GvAV(gv));
79072805 LW	479	GvAV(gv) = av;
	480	break;
	481	case SAVEt_HV: /* hash reference */
	482	hv = (HV*)SSPOPPTR;
	483	gv = (GV*)SSPOPPTR;
8990e307	484	SvREFCNT_dec(GvHV(gv));
79072805 LW	485	GvHV(gv) = hv;
	486	break;
	487	case SAVEt_INT: /* int reference */
	488	ptr = SSPOPPTR;
	489	(int)ptr = (int)SSPOPINT;
	490	break;
85e6fe83 LW	491	case SAVEt_LONG: /* long reference */
	492	ptr = SSPOPPTR;
	493	(long)ptr = (long)SSPOPLONG;
	494	break;
79072805 LW	495	case SAVEt_I32: /* I32 reference */
	496	ptr = SSPOPPTR;
	497	(I32)ptr = (I32)SSPOPINT;
	498	break;
a0d0e21e LW	499	case SAVEt_IV: /* IV reference */
	500	ptr = SSPOPPTR;
	501	(IV)ptr = (IV)SSPOPIV;
	502	break;
79072805 LW	503	case SAVEt_SPTR: /* SV* reference */
	504	ptr = SSPOPPTR;
	505	(SV)ptr = (SV)SSPOPPTR;
	506	break;
85e6fe83 LW	507	case SAVEt_PPTR: /* char* reference */
	508	ptr = SSPOPPTR;
	509	(char)ptr = (char)SSPOPPTR;
	510	break;
79072805 LW	511	case SAVEt_HPTR: /* HV* reference */
	512	ptr = SSPOPPTR;
	513	(HV)ptr = (HV)SSPOPPTR;
	514	break;
	515	case SAVEt_APTR: /* AV* reference */
	516	ptr = SSPOPPTR;
	517	(AV)ptr = (AV)SSPOPPTR;
	518	break;
	519	case SAVEt_NSTAB:
	520	gv = (GV*)SSPOPPTR;
	521	(void)sv_clear(gv);
	522	break;
	523	case SAVEt_GP: /* scalar reference */
	524	ptr = SSPOPPTR;
	525	gv = (GV*)SSPOPPTR;
	526	gp_free(gv);
	527	GvGP(gv) = (GP*)ptr;
	528	break;
8990e307 LW	529	case SAVEt_FREESV:
	530	ptr = SSPOPPTR;
	531	SvREFCNT_dec((SV*)ptr);
	532	break;
	533	case SAVEt_FREEOP:
	534	ptr = SSPOPPTR;
	535	curpad = AvARRAY(comppad);
	536	op_free((OP*)ptr);
	537	break;
	538	case SAVEt_FREEPV:
	539	ptr = SSPOPPTR;
	540	Safefree((char*)ptr);
	541	break;
	542	case SAVEt_CLEARSV:
	543	ptr = SSPOPPTR;
	544	sv = (SV*)ptr;
a0d0e21e	545	if (SvREFCNT(sv) <= 1) { /* Can clear pad variable in place. */
8990e307 LW	546	if (SvTHINKFIRST(sv)) {
	547	if (SvREADONLY(sv))
	548	croak("panic: leave_scope clearsv");
	549	if (SvROK(sv))
	550	sv_unref(sv);
	551	}
a0d0e21e LW	552	if (SvMAGICAL(sv))
a0d0e21e LW	553	mg_free(sv);
8990e307 LW	554
	555	switch (SvTYPE(sv)) {
	556	case SVt_NULL:
	557	break;
	558	case SVt_PVAV:
	559	av_clear((AV*)sv);
	560	break;
	561	case SVt_PVHV:
	562	hv_clear((HV*)sv);
	563	break;
	564	case SVt_PVCV:
	565	sub_generation++;
85e6fe83	566	cv_undef((CV*)sv);
8990e307 LW	567	break;
	568	default:
	569	if (SvPOK(sv) && SvLEN(sv))
a0d0e21e LW	570	(void)SvOOK_off(sv);
a0d0e21e LW	571	(void)SvOK_off(sv);
8990e307 LW	572	break;
	573	}
	574	}
	575	else { /* Someone has a claim on this, so abandon it. */
	576	SvREFCNT_dec(sv); /* Cast current value to the winds. */
	577	switch (SvTYPE(sv)) { /* Console ourselves with a new value */
	578	case SVt_PVAV: (SV)ptr = (SV)newAV(); break;
	579	case SVt_PVHV: (SV)ptr = (SV)newHV(); break;
	580	default: (SV*)ptr = NEWSV(0,0); break;
	581	}
	582	}
	583	break;
	584	case SAVEt_DELETE:
	585	ptr = SSPOPPTR;
	586	hv = (HV*)ptr;
	587	ptr = SSPOPPTR;
748a9306	588	(void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
adbc6bb1	589	Safefree(ptr);
8990e307	590	break;
a0d0e21e LW	591	case SAVEt_DESTRUCTOR:
	592	ptr = SSPOPPTR;
	593	(*SSPOPDPTR)(ptr);
	594	break;
	595	case SAVEt_REGCONTEXT:
	596	savestack_ix -= SSPOPINT; /* regexp must have croaked */
	597	break;
79072805	598	default:
463ee0b2	599	croak("panic: leave_scope inconsistency");
79072805 LW	600	}
	601	}
	602	}
8990e307 LW	603
	604	#ifdef DEBUGGING
	605	void
	606	cx_dump(cx)
	607	CONTEXT* cx;
	608	{
	609	fprintf(stderr, "CX %d = %s\n", cx - cxstack, block_type[cx->cx_type]);
	610	if (cx->cx_type != CXt_SUBST) {
	611	fprintf(stderr, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
	612	fprintf(stderr, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
	613	fprintf(stderr, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
	614	fprintf(stderr, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
	615	fprintf(stderr, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
	616	fprintf(stderr, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
	617	fprintf(stderr, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
	618	}
	619	switch (cx->cx_type) {
	620	case CXt_NULL:
	621	case CXt_BLOCK:
	622	break;
	623	case CXt_SUB:
	624	fprintf(stderr, "BLK_SUB.CV = 0x%lx\n",
	625	(long)cx->blk_sub.cv);
	626	fprintf(stderr, "BLK_SUB.GV = 0x%lx\n",
	627	(long)cx->blk_sub.gv);
	628	fprintf(stderr, "BLK_SUB.DFOUTGV = 0x%lx\n",
	629	(long)cx->blk_sub.dfoutgv);
	630	fprintf(stderr, "BLK_SUB.OLDDEPTH = %ld\n",
	631	(long)cx->blk_sub.olddepth);
	632	fprintf(stderr, "BLK_SUB.HASARGS = %d\n",
	633	(int)cx->blk_sub.hasargs);
	634	break;
	635	case CXt_EVAL:
	636	fprintf(stderr, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
	637	(long)cx->blk_eval.old_in_eval);
	638	fprintf(stderr, "BLK_EVAL.OLD_OP_TYPE = %s\n",
	639	op_name[cx->blk_eval.old_op_type]);
	640	fprintf(stderr, "BLK_EVAL.OLD_NAME = %s\n",
	641	cx->blk_eval.old_name);
	642	fprintf(stderr, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
	643	(long)cx->blk_eval.old_eval_root);
	644	break;
	645
	646	case CXt_LOOP:
	647	fprintf(stderr, "BLK_LOOP.LABEL = %s\n",
	648	cx->blk_loop.label);
	649	fprintf(stderr, "BLK_LOOP.RESETSP = %ld\n",
	650	(long)cx->blk_loop.resetsp);
	651	fprintf(stderr, "BLK_LOOP.REDO_OP = 0x%lx\n",
	652	(long)cx->blk_loop.redo_op);
	653	fprintf(stderr, "BLK_LOOP.NEXT_OP = 0x%lx\n",
	654	(long)cx->blk_loop.next_op);
	655	fprintf(stderr, "BLK_LOOP.LAST_OP = 0x%lx\n",
	656	(long)cx->blk_loop.last_op);
	657	fprintf(stderr, "BLK_LOOP.ITERIX = %ld\n",
	658	(long)cx->blk_loop.iterix);
	659	fprintf(stderr, "BLK_LOOP.ITERARY = 0x%lx\n",
	660	(long)cx->blk_loop.iterary);
	661	fprintf(stderr, "BLK_LOOP.ITERVAR = 0x%lx\n",
	662	(long)cx->blk_loop.itervar);
	663	if (cx->blk_loop.itervar)
	664	fprintf(stderr, "BLK_LOOP.ITERSAVE = 0x%lx\n",
	665	(long)cx->blk_loop.itersave);
	666	break;
667
668	case CXt_SUBST:
669	fprintf(stderr, "SB_ITERS = %ld\n",
670	(long)cx->sb_iters);
671	fprintf(stderr, "SB_MAXITERS = %ld\n",
672	(long)cx->sb_maxiters);
673	fprintf(stderr, "SB_SAFEBASE = %ld\n",
674	(long)cx->sb_safebase);
675	fprintf(stderr, "SB_ONCE = %ld\n",
676	(long)cx->sb_once);
677	fprintf(stderr, "SB_ORIG = %s\n",
678	cx->sb_orig);
679	fprintf(stderr, "SB_DSTR = 0x%lx\n",
680	(long)cx->sb_dstr);
681	fprintf(stderr, "SB_TARG = 0x%lx\n",
682	(long)cx->sb_targ);
683	fprintf(stderr, "SB_S = 0x%lx\n",
684	(long)cx->sb_s);
685	fprintf(stderr, "SB_M = 0x%lx\n",
686	(long)cx->sb_m);
687	fprintf(stderr, "SB_STREND = 0x%lx\n",
688	(long)cx->sb_strend);
689	fprintf(stderr, "SB_SUBBASE = 0x%lx\n",
690	(long)cx->sb_subbase);
691	break;
692	}
693	}
694	#endif