[perl5.git] / scope.c

/* $RCSfile: op.c,v $$Revision: 4.1 $$Date: 92/08/07 17:19:16 $
 *
 *    Copyright (c) 1991, 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.
 *
 * $Log:	op.c,v $
 */

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

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
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)) {
	sv_upgrade(sv, SvTYPE(osv));
	mg_get(osv);
	SvFLAGS(osv) |= (SvFLAGS(osv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
	SvMAGIC(sv) = SvMAGIC(osv);
	localizing = TRUE;
	SvSETMAGIC(sv);
	localizing = FALSE;
    }
    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(sv)) {
	sv_upgrade(sv, SvTYPE(osv));
	SvMAGIC(sv) = SvMAGIC(osv);
	localizing = TRUE;
	SvSETMAGIC(sv);
	localizing = FALSE;
    }
    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);
}

/* 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
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);
	    SvSETMAGIC(sv);
	    break;
        case SAVEt_SV:				/* scalar reference */
	    value = (SV*)SSPOPPTR;
	    gv = (GV*)SSPOPPTR;
	    sv = GvSV(gv);
	    if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
		SvMAGIC(value) = SvMAGIC(sv);
		SvMAGIC(sv) = 0;
	    }
            SvREFCNT_dec(sv);
            GvSV(gv) = sv = value;
	    SvSETMAGIC(sv);
            break;
        case SAVEt_SVREF:			/* scalar reference */
	    ptr = SSPOPPTR;
	    sv = *(SV**)ptr;
	    if (SvTYPE(sv) >= SVt_PVMG)
		SvMAGIC(sv) = 0;
            SvREFCNT_dec(sv);
	    *(SV**)ptr = sv = (SV*)SSPOPPTR;
	    SvSETMAGIC(sv);
            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_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);
		}

		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))
			SvOOK_off(sv);
		    SvOK_off(sv);
		    SvSETMAGIC(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;
	    hv_delete(hv, (char*)ptr, (U32)SSPOPINT);
	    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
79072805 LW	1	/* $RCSfile: op.c,v $$Revision: 4.1 $$Date: 92/08/07 17:19:16 $
	2	*
	3	* Copyright (c) 1991, Larry Wall
	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	*
	8	* $Log: op.c,v $
	9	*/
	10
	11	#include "EXTERN.h"
	12	#include "perl.h"
	13
	14	I32
	15	cxinc()
	16	{
	17	cxstack_max = cxstack_max * 3 / 2;
	18	Renew(cxstack, cxstack_max, CONTEXT);
	19	return cxstack_ix + 1;
	20	}
	21
	22	void
	23	push_return(retop)
	24	OP *retop;
	25	{
	26	if (retstack_ix == retstack_max) {
	27	retstack_max = retstack_max * 3 / 2;
	28	Renew(retstack, retstack_max, OP*);
	29	}
	30	retstack[retstack_ix++] = retop;
	31	}
	32
	33	OP *
	34	pop_return()
	35	{
	36	if (retstack_ix > 0)
	37	return retstack[--retstack_ix];
	38	else
	39	return Nullop;
	40	}
	41
	42	void
	43	push_scope()
	44	{
	45	if (scopestack_ix == scopestack_max) {
	46	scopestack_max = scopestack_max * 3 / 2;
	47	Renew(scopestack, scopestack_max, I32);
	48	}
	49	scopestack[scopestack_ix++] = savestack_ix;
	50
	51	}
	52
	53	void
	54	pop_scope()
	55	{
	56	I32 oldsave = scopestack[--scopestack_ix];
8990e307	57	LEAVE_SCOPE(oldsave);
79072805 LW	58	}
	59
	60	void
	61	savestack_grow()
	62	{
	63	savestack_max = savestack_max * 3 / 2;
	64	Renew(savestack, savestack_max, ANY);
	65	}
	66
	67	void
	68	free_tmps()
	69	{
	70	/* XXX should tmps_floor live in cxstack? */
	71	I32 myfloor = tmps_floor;
	72	while (tmps_ix > myfloor) { /* clean up after last statement */
	73	SV* sv = tmps_stack[tmps_ix];
	74	tmps_stack[tmps_ix--] = Nullsv;
463ee0b2 LW	75	if (sv) {
	76	#ifdef DEBUGGING
	77	SvTEMP_off(sv);
	78	#endif
8990e307	79	SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
463ee0b2	80	}
79072805 LW	81	}
	82	}
	83
	84	SV *
	85	save_scalar(gv)
	86	GV *gv;
	87	{
	88	register SV *sv;
	89	SV *osv = GvSV(gv);
	90
	91	SSCHECK(3);
	92	SSPUSHPTR(gv);
	93	SSPUSHPTR(osv);
	94	SSPUSHINT(SAVEt_SV);
	95
	96	sv = GvSV(gv) = NEWSV(0,0);
93a17b20	97	if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv)) {
79072805	98	sv_upgrade(sv, SvTYPE(osv));
85e6fe83 LW	99	mg_get(osv);
85e6fe83 LW	100	SvFLAGS(osv) \|= (SvFLAGS(osv) & (SVp_IOK\|SVp_NOK\|SVp_POK)) >> PRIVSHIFT;
79072805 LW	101	SvMAGIC(sv) = SvMAGIC(osv);
	102	localizing = TRUE;
	103	SvSETMAGIC(sv);
	104	localizing = FALSE;
	105	}
	106	return sv;
	107	}
	108
	109	#ifdef INLINED_ELSEWHERE
	110	void
	111	save_gp(gv)
	112	GV *gv;
	113	{
	114	register GP *gp;
	115	GP *ogp = GvGP(gv);
	116
	117	SSCHECK(3);
	118	SSPUSHPTR(gv);
	119	SSPUSHPTR(ogp);
	120	SSPUSHINT(SAVEt_GP);
	121
	122	Newz(602,gp, 1, GP);
	123	GvGP(gv) = gp;
	124	GvREFCNT(gv) = 1;
	125	GvSV(gv) = NEWSV(72,0);
	126	GvLINE(gv) = curcop->cop_line;
	127	GvEGV(gv) = gv;
	128	}
	129	#endif
	130
	131	SV*
	132	save_svref(sptr)
	133	SV **sptr;
	134	{
	135	register SV *sv;
	136	SV osv = sptr;
	137
	138	SSCHECK(3);
	139	SSPUSHPTR(*sptr);
	140	SSPUSHPTR(sptr);
	141	SSPUSHINT(SAVEt_SVREF);
	142
	143	sv = *sptr = NEWSV(0,0);
	144	if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(sv)) {
	145	sv_upgrade(sv, SvTYPE(osv));
	146	SvMAGIC(sv) = SvMAGIC(osv);
	147	localizing = TRUE;
	148	SvSETMAGIC(sv);
	149	localizing = FALSE;
	150	}
	151	return sv;
	152	}
	153
	154	AV *
	155	save_ary(gv)
	156	GV *gv;
	157	{
	158	SSCHECK(3);
	159	SSPUSHPTR(gv);
	160	SSPUSHPTR(GvAVn(gv));
	161	SSPUSHINT(SAVEt_AV);
	162
	163	GvAV(gv) = Null(AV*);
	164	return GvAVn(gv);
165	}
166
167	HV *
168	save_hash(gv)
169	GV *gv;
170	{
171	SSCHECK(3);
172	SSPUSHPTR(gv);
173	SSPUSHPTR(GvHVn(gv));
174	SSPUSHINT(SAVEt_HV);
175
176	GvHV(gv) = Null(HV*);
177	return GvHVn(gv);
178	}
179
180	void
181	save_item(item)
182	register SV *item;
183	{
184	register SV *sv;
185
186	SSCHECK(3);
187	SSPUSHPTR(item); /* remember the pointer */
188	sv = NEWSV(0,0);
189	sv_setsv(sv,item);
190	SSPUSHPTR(sv); /* remember the value */
191	SSPUSHINT(SAVEt_ITEM);
192	}
193
194	void
195	save_int(intp)
196	int *intp;
197	{
198	SSCHECK(3);
199	SSPUSHINT(*intp);
200	SSPUSHPTR(intp);
201	SSPUSHINT(SAVEt_INT);
202	}
203
204	void
85e6fe83 LW	205	save_long(longp)
	206	long *longp;
	207	{
	208	SSCHECK(3);
	209	SSPUSHLONG(*longp);
	210	SSPUSHPTR(longp);
	211	SSPUSHINT(SAVEt_LONG);
	212	}
	213
	214	void
79072805 LW	215	save_I32(intp)
	216	I32 *intp;
	217	{
	218	SSCHECK(3);
	219	SSPUSHINT(*intp);
	220	SSPUSHPTR(intp);
	221	SSPUSHINT(SAVEt_I32);
	222	}
	223
85e6fe83 LW	224	/* Cannot use save_sptr() to store a char* since the SV** cast will
	225	* force word-alignment and we'll miss the pointer.
	226	*/
	227	void
	228	save_pptr(pptr)
	229	char **pptr;
	230	{
	231	SSCHECK(3);
	232	SSPUSHPTR(*pptr);
	233	SSPUSHPTR(pptr);
	234	SSPUSHINT(SAVEt_PPTR);
	235	}
	236
79072805 LW	237	void
	238	save_sptr(sptr)
	239	SV **sptr;
	240	{
	241	SSCHECK(3);
	242	SSPUSHPTR(*sptr);
	243	SSPUSHPTR(sptr);
	244	SSPUSHINT(SAVEt_SPTR);
	245	}
	246
	247	void
	248	save_nogv(gv)
	249	GV *gv;
	250	{
	251	SSCHECK(2);
	252	SSPUSHPTR(gv);
	253	SSPUSHINT(SAVEt_NSTAB);
	254	}
	255
	256	void
	257	save_hptr(hptr)
	258	HV **hptr;
	259	{
	260	SSCHECK(3);
85e6fe83	261	SSPUSHPTR(*hptr);
79072805 LW	262	SSPUSHPTR(hptr);
	263	SSPUSHINT(SAVEt_HPTR);
	264	}
	265
	266	void
	267	save_aptr(aptr)
	268	AV **aptr;
	269	{
	270	SSCHECK(3);
85e6fe83	271	SSPUSHPTR(*aptr);
79072805 LW	272	SSPUSHPTR(aptr);
	273	SSPUSHINT(SAVEt_APTR);
	274	}
	275
	276	void
8990e307 LW	277	save_freesv(sv)
	278	SV *sv;
	279	{
	280	SSCHECK(2);
	281	SSPUSHPTR(sv);
	282	SSPUSHINT(SAVEt_FREESV);
	283	}
	284
	285	void
	286	save_freeop(op)
	287	OP *op;
	288	{
	289	SSCHECK(2);
	290	SSPUSHPTR(op);
	291	SSPUSHINT(SAVEt_FREEOP);
	292	}
	293
	294	void
	295	save_freepv(pv)
	296	char *pv;
	297	{
	298	SSCHECK(2);
	299	SSPUSHPTR(pv);
	300	SSPUSHINT(SAVEt_FREEPV);
	301	}
	302
	303	void
	304	save_clearsv(svp)
	305	SV** svp;
	306	{
	307	SSCHECK(2);
	308	SSPUSHPTR(svp);
	309	SSPUSHINT(SAVEt_CLEARSV);
	310	}
	311
	312	void
	313	save_delete(hv,key,klen)
	314	HV *hv;
	315	char *key;
	316	I32 klen;
	317	{
	318	SSCHECK(4);
	319	SSPUSHINT(klen);
	320	SSPUSHPTR(key);
	321	SSPUSHPTR(hv);
	322	SSPUSHINT(SAVEt_DELETE);
	323	}
	324
	325	void
79072805 LW	326	save_list(sarg,maxsarg)
	327	register SV **sarg;
	328	I32 maxsarg;
	329	{
	330	register SV *sv;
	331	register I32 i;
	332
	333	SSCHECK(3 * maxsarg);
	334	for (i = 1; i <= maxsarg; i++) {
	335	SSPUSHPTR(sarg[i]); /* remember the pointer */
	336	sv = NEWSV(0,0);
	337	sv_setsv(sv,sarg[i]);
	338	SSPUSHPTR(sv); /* remember the value */
	339	SSPUSHINT(SAVEt_ITEM);
	340	}
	341	}
	342
	343	void
	344	leave_scope(base)
	345	I32 base;
	346	{
	347	register SV *sv;
	348	register SV *value;
	349	register GV *gv;
	350	register AV *av;
	351	register HV *hv;
	352	register void* ptr;
	353
	354	if (base < -1)
463ee0b2	355	croak("panic: corrupt saved stack index");
79072805 LW	356	while (savestack_ix > base) {
	357	switch (SSPOPINT) {
	358	case SAVEt_ITEM: /* normal string */
	359	value = (SV*)SSPOPPTR;
	360	sv = (SV*)SSPOPPTR;
	361	sv_replace(sv,value);
	362	SvSETMAGIC(sv);
	363	break;
	364	case SAVEt_SV: /* scalar reference */
	365	value = (SV*)SSPOPPTR;
	366	gv = (GV*)SSPOPPTR;
	367	sv = GvSV(gv);
85e6fe83 LW	368	if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
85e6fe83 LW	369	SvMAGIC(value) = SvMAGIC(sv);
79072805	370	SvMAGIC(sv) = 0;
85e6fe83	371	}
8990e307	372	SvREFCNT_dec(sv);
79072805 LW	373	GvSV(gv) = sv = value;
	374	SvSETMAGIC(sv);
	375	break;
	376	case SAVEt_SVREF: /* scalar reference */
	377	ptr = SSPOPPTR;
	378	sv = (SV*)ptr;
	379	if (SvTYPE(sv) >= SVt_PVMG)
	380	SvMAGIC(sv) = 0;
8990e307	381	SvREFCNT_dec(sv);
79072805 LW	382	(SV)ptr = sv = (SV)SSPOPPTR;
	383	SvSETMAGIC(sv);
	384	break;
	385	case SAVEt_AV: /* array reference */
	386	av = (AV*)SSPOPPTR;
	387	gv = (GV*)SSPOPPTR;
8990e307	388	SvREFCNT_dec(GvAV(gv));
79072805 LW	389	GvAV(gv) = av;
	390	break;
	391	case SAVEt_HV: /* hash reference */
	392	hv = (HV*)SSPOPPTR;
	393	gv = (GV*)SSPOPPTR;
8990e307	394	SvREFCNT_dec(GvHV(gv));
79072805 LW	395	GvHV(gv) = hv;
	396	break;
	397	case SAVEt_INT: /* int reference */
	398	ptr = SSPOPPTR;
	399	(int)ptr = (int)SSPOPINT;
	400	break;
85e6fe83 LW	401	case SAVEt_LONG: /* long reference */
	402	ptr = SSPOPPTR;
	403	(long)ptr = (long)SSPOPLONG;
	404	break;
79072805 LW	405	case SAVEt_I32: /* I32 reference */
	406	ptr = SSPOPPTR;
	407	(I32)ptr = (I32)SSPOPINT;
	408	break;
	409	case SAVEt_SPTR: /* SV* reference */
	410	ptr = SSPOPPTR;
	411	(SV)ptr = (SV)SSPOPPTR;
	412	break;
85e6fe83 LW	413	case SAVEt_PPTR: /* char* reference */
	414	ptr = SSPOPPTR;
	415	(char)ptr = (char)SSPOPPTR;
	416	break;
79072805 LW	417	case SAVEt_HPTR: /* HV* reference */
	418	ptr = SSPOPPTR;
	419	(HV)ptr = (HV)SSPOPPTR;
	420	break;
	421	case SAVEt_APTR: /* AV* reference */
	422	ptr = SSPOPPTR;
	423	(AV)ptr = (AV)SSPOPPTR;
	424	break;
	425	case SAVEt_NSTAB:
	426	gv = (GV*)SSPOPPTR;
	427	(void)sv_clear(gv);
	428	break;
	429	case SAVEt_GP: /* scalar reference */
	430	ptr = SSPOPPTR;
	431	gv = (GV*)SSPOPPTR;
	432	gp_free(gv);
	433	GvGP(gv) = (GP*)ptr;
	434	break;
8990e307 LW	435	case SAVEt_FREESV:
	436	ptr = SSPOPPTR;
	437	SvREFCNT_dec((SV*)ptr);
	438	break;
	439	case SAVEt_FREEOP:
	440	ptr = SSPOPPTR;
	441	curpad = AvARRAY(comppad);
	442	op_free((OP*)ptr);
	443	break;
	444	case SAVEt_FREEPV:
	445	ptr = SSPOPPTR;
	446	Safefree((char*)ptr);
	447	break;
	448	case SAVEt_CLEARSV:
	449	ptr = SSPOPPTR;
	450	sv = (SV*)ptr;
	451	if (SvREFCNT(sv) <= 1) { /* Can clear pad variable in place. */
	452	if (SvTHINKFIRST(sv)) {
	453	if (SvREADONLY(sv))
	454	croak("panic: leave_scope clearsv");
	455	if (SvROK(sv))
	456	sv_unref(sv);
	457	}
	458
	459	switch (SvTYPE(sv)) {
	460	case SVt_NULL:
	461	break;
	462	case SVt_PVAV:
	463	av_clear((AV*)sv);
	464	break;
	465	case SVt_PVHV:
	466	hv_clear((HV*)sv);
	467	break;
	468	case SVt_PVCV:
	469	sub_generation++;
85e6fe83	470	cv_undef((CV*)sv);
8990e307 LW	471	break;
	472	default:
	473	if (SvPOK(sv) && SvLEN(sv))
	474	SvOOK_off(sv);
	475	SvOK_off(sv);
	476	SvSETMAGIC(sv);
	477	break;
	478	}
	479	}
	480	else { /* Someone has a claim on this, so abandon it. */
	481	SvREFCNT_dec(sv); /* Cast current value to the winds. */
	482	switch (SvTYPE(sv)) { /* Console ourselves with a new value */
	483	case SVt_PVAV: (SV)ptr = (SV)newAV(); break;
	484	case SVt_PVHV: (SV)ptr = (SV)newHV(); break;
	485	default: (SV*)ptr = NEWSV(0,0); break;
	486	}
	487	}
	488	break;
	489	case SAVEt_DELETE:
	490	ptr = SSPOPPTR;
	491	hv = (HV*)ptr;
	492	ptr = SSPOPPTR;
	493	hv_delete(hv, (char*)ptr, (U32)SSPOPINT);
	494	break;
79072805	495	default:
463ee0b2	496	croak("panic: leave_scope inconsistency");
79072805 LW	497	}
	498	}
	499	}
8990e307 LW	500
	501	#ifdef DEBUGGING
	502	void
	503	cx_dump(cx)
	504	CONTEXT* cx;
	505	{
	506	fprintf(stderr, "CX %d = %s\n", cx - cxstack, block_type[cx->cx_type]);
	507	if (cx->cx_type != CXt_SUBST) {
	508	fprintf(stderr, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
	509	fprintf(stderr, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
	510	fprintf(stderr, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
	511	fprintf(stderr, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
	512	fprintf(stderr, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
	513	fprintf(stderr, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
	514	fprintf(stderr, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
	515	}
	516	switch (cx->cx_type) {
	517	case CXt_NULL:
	518	case CXt_BLOCK:
	519	break;
	520	case CXt_SUB:
	521	fprintf(stderr, "BLK_SUB.CV = 0x%lx\n",
	522	(long)cx->blk_sub.cv);
	523	fprintf(stderr, "BLK_SUB.GV = 0x%lx\n",
	524	(long)cx->blk_sub.gv);
	525	fprintf(stderr, "BLK_SUB.DFOUTGV = 0x%lx\n",
	526	(long)cx->blk_sub.dfoutgv);
	527	fprintf(stderr, "BLK_SUB.OLDDEPTH = %ld\n",
	528	(long)cx->blk_sub.olddepth);
	529	fprintf(stderr, "BLK_SUB.HASARGS = %d\n",
	530	(int)cx->blk_sub.hasargs);
	531	break;
	532	case CXt_EVAL:
	533	fprintf(stderr, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
	534	(long)cx->blk_eval.old_in_eval);
	535	fprintf(stderr, "BLK_EVAL.OLD_OP_TYPE = %s\n",
	536	op_name[cx->blk_eval.old_op_type]);
	537	fprintf(stderr, "BLK_EVAL.OLD_NAME = %s\n",
	538	cx->blk_eval.old_name);
	539	fprintf(stderr, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
	540	(long)cx->blk_eval.old_eval_root);
	541	break;
	542
	543	case CXt_LOOP:
	544	fprintf(stderr, "BLK_LOOP.LABEL = %s\n",
	545	cx->blk_loop.label);
	546	fprintf(stderr, "BLK_LOOP.RESETSP = %ld\n",
	547	(long)cx->blk_loop.resetsp);
	548	fprintf(stderr, "BLK_LOOP.REDO_OP = 0x%lx\n",
	549	(long)cx->blk_loop.redo_op);
	550	fprintf(stderr, "BLK_LOOP.NEXT_OP = 0x%lx\n",
	551	(long)cx->blk_loop.next_op);
	552	fprintf(stderr, "BLK_LOOP.LAST_OP = 0x%lx\n",
	553	(long)cx->blk_loop.last_op);
	554	fprintf(stderr, "BLK_LOOP.ITERIX = %ld\n",
	555	(long)cx->blk_loop.iterix);
	556	fprintf(stderr, "BLK_LOOP.ITERARY = 0x%lx\n",
	557	(long)cx->blk_loop.iterary);
	558	fprintf(stderr, "BLK_LOOP.ITERVAR = 0x%lx\n",
	559	(long)cx->blk_loop.itervar);
	560	if (cx->blk_loop.itervar)
	561	fprintf(stderr, "BLK_LOOP.ITERSAVE = 0x%lx\n",
	562	(long)cx->blk_loop.itersave);
	563	break;
564
565	case CXt_SUBST:
566	fprintf(stderr, "SB_ITERS = %ld\n",
567	(long)cx->sb_iters);
568	fprintf(stderr, "SB_MAXITERS = %ld\n",
569	(long)cx->sb_maxiters);
570	fprintf(stderr, "SB_SAFEBASE = %ld\n",
571	(long)cx->sb_safebase);
572	fprintf(stderr, "SB_ONCE = %ld\n",
573	(long)cx->sb_once);
574	fprintf(stderr, "SB_ORIG = %s\n",
575	cx->sb_orig);
576	fprintf(stderr, "SB_DSTR = 0x%lx\n",
577	(long)cx->sb_dstr);
578	fprintf(stderr, "SB_TARG = 0x%lx\n",
579	(long)cx->sb_targ);
580	fprintf(stderr, "SB_S = 0x%lx\n",
581	(long)cx->sb_s);
582	fprintf(stderr, "SB_M = 0x%lx\n",
583	(long)cx->sb_m);
584	fprintf(stderr, "SB_STREND = 0x%lx\n",
585	(long)cx->sb_strend);
586	fprintf(stderr, "SB_SUBBASE = 0x%lx\n",
587	(long)cx->sb_subbase);
588	break;
589	}
590	}
591	#endif