[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];
    if (savestack_ix > oldsave)
	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
	    sv_free(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));
	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_I32(intp)
I32 *intp;
{
    SSCHECK(3);
    SSPUSHINT(*intp);
    SSPUSHPTR(intp);
    SSPUSHINT(SAVEt_I32);
}

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);
    SSPUSHINT(*hptr);
    SSPUSHPTR(hptr);
    SSPUSHINT(SAVEt_HPTR);
}

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

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) = 0;
            sv_free(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;
            sv_free(sv);
	    *(SV**)ptr = sv = (SV*)SSPOPPTR;
	    SvSETMAGIC(sv);
            break;
        case SAVEt_AV:				/* array reference */
	    av = (AV*)SSPOPPTR;
	    gv = (GV*)SSPOPPTR;
            av_free(GvAV(gv));
            GvAV(gv) = av;
            break;
        case SAVEt_HV:				/* hash reference */
	    hv = (HV*)SSPOPPTR;
	    gv = (GV*)SSPOPPTR;
            (void)hv_free(GvHV(gv));
            GvHV(gv) = hv;
            break;
	case SAVEt_INT:				/* int reference */
	    ptr = SSPOPPTR;
	    *(int*)ptr = (int)SSPOPINT;
	    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_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;
	default:
	    croak("panic: leave_scope inconsistency");
	}
    }
}
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];
	57	if (savestack_ix > oldsave)
	58	leave_scope(oldsave);
	59	}
	60
	61	void
	62	savestack_grow()
	63	{
	64	savestack_max = savestack_max * 3 / 2;
65	Renew(savestack, savestack_max, ANY);
66	}
67
68	void
69	free_tmps()
70	{
71	/* XXX should tmps_floor live in cxstack? */
72	I32 myfloor = tmps_floor;
73	while (tmps_ix > myfloor) { /* clean up after last statement */
74	SV* sv = tmps_stack[tmps_ix];
75	tmps_stack[tmps_ix--] = Nullsv;
463ee0b2 LW	76	if (sv) {
	77	#ifdef DEBUGGING
	78	SvTEMP_off(sv);
	79	#endif
79072805	80	sv_free(sv); /* note, can modify tmps_ix!!! */
463ee0b2	81	}
79072805 LW	82	}
	83	}
	84
	85	SV *
	86	save_scalar(gv)
	87	GV *gv;
	88	{
	89	register SV *sv;
	90	SV *osv = GvSV(gv);
	91
	92	SSCHECK(3);
	93	SSPUSHPTR(gv);
	94	SSPUSHPTR(osv);
	95	SSPUSHINT(SAVEt_SV);
	96
	97	sv = GvSV(gv) = NEWSV(0,0);
93a17b20	98	if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv)) {
79072805 LW	99	sv_upgrade(sv, SvTYPE(osv));
	100	SvMAGIC(sv) = SvMAGIC(osv);
	101	localizing = TRUE;
	102	SvSETMAGIC(sv);
	103	localizing = FALSE;
	104	}
	105	return sv;
	106	}
	107
	108	#ifdef INLINED_ELSEWHERE
	109	void
	110	save_gp(gv)
	111	GV *gv;
	112	{
	113	register GP *gp;
	114	GP *ogp = GvGP(gv);
	115
	116	SSCHECK(3);
	117	SSPUSHPTR(gv);
	118	SSPUSHPTR(ogp);
	119	SSPUSHINT(SAVEt_GP);
	120
	121	Newz(602,gp, 1, GP);
	122	GvGP(gv) = gp;
	123	GvREFCNT(gv) = 1;
	124	GvSV(gv) = NEWSV(72,0);
	125	GvLINE(gv) = curcop->cop_line;
	126	GvEGV(gv) = gv;
	127	}
	128	#endif
	129
	130	SV*
	131	save_svref(sptr)
	132	SV **sptr;
	133	{
	134	register SV *sv;
	135	SV osv = sptr;
	136
	137	SSCHECK(3);
	138	SSPUSHPTR(*sptr);
	139	SSPUSHPTR(sptr);
	140	SSPUSHINT(SAVEt_SVREF);
	141
	142	sv = *sptr = NEWSV(0,0);
	143	if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(sv)) {
	144	sv_upgrade(sv, SvTYPE(osv));
	145	SvMAGIC(sv) = SvMAGIC(osv);
	146	localizing = TRUE;
	147	SvSETMAGIC(sv);
	148	localizing = FALSE;
	149	}
	150	return sv;
	151	}
	152
	153	AV *
	154	save_ary(gv)
	155	GV *gv;
	156	{
	157	SSCHECK(3);
	158	SSPUSHPTR(gv);
	159	SSPUSHPTR(GvAVn(gv));
	160	SSPUSHINT(SAVEt_AV);
	161
	162	GvAV(gv) = Null(AV*);
163	return GvAVn(gv);
164	}
165
166	HV *
167	save_hash(gv)
168	GV *gv;
169	{
170	SSCHECK(3);
171	SSPUSHPTR(gv);
172	SSPUSHPTR(GvHVn(gv));
173	SSPUSHINT(SAVEt_HV);
174
175	GvHV(gv) = Null(HV*);
176	return GvHVn(gv);
177	}
178
179	void
180	save_item(item)
181	register SV *item;
182	{
183	register SV *sv;
184
185	SSCHECK(3);
186	SSPUSHPTR(item); /* remember the pointer */
187	sv = NEWSV(0,0);
188	sv_setsv(sv,item);
189	SSPUSHPTR(sv); /* remember the value */
190	SSPUSHINT(SAVEt_ITEM);
191	}
192
193	void
194	save_int(intp)
195	int *intp;
196	{
197	SSCHECK(3);
198	SSPUSHINT(*intp);
199	SSPUSHPTR(intp);
200	SSPUSHINT(SAVEt_INT);
201	}
202
203	void
204	save_I32(intp)
205	I32 *intp;
206	{
207	SSCHECK(3);
208	SSPUSHINT(*intp);
209	SSPUSHPTR(intp);
210	SSPUSHINT(SAVEt_I32);
211	}
212
213	void
214	save_sptr(sptr)
215	SV **sptr;
216	{
217	SSCHECK(3);
218	SSPUSHPTR(*sptr);
219	SSPUSHPTR(sptr);
220	SSPUSHINT(SAVEt_SPTR);
221	}
222
223	void
224	save_nogv(gv)
225	GV *gv;
226	{
227	SSCHECK(2);
228	SSPUSHPTR(gv);
229	SSPUSHINT(SAVEt_NSTAB);
230	}
231
232	void
233	save_hptr(hptr)
234	HV **hptr;
235	{
236	SSCHECK(3);
237	SSPUSHINT(*hptr);
238	SSPUSHPTR(hptr);
239	SSPUSHINT(SAVEt_HPTR);
240	}
241
242	void
243	save_aptr(aptr)
244	AV **aptr;
245	{
246	SSCHECK(3);
247	SSPUSHINT(*aptr);
248	SSPUSHPTR(aptr);
249	SSPUSHINT(SAVEt_APTR);
250	}
251
252	void
253	save_list(sarg,maxsarg)
254	register SV **sarg;
255	I32 maxsarg;
256	{
257	register SV *sv;
258	register I32 i;
259
260	SSCHECK(3 * maxsarg);
261	for (i = 1; i <= maxsarg; i++) {
262	SSPUSHPTR(sarg[i]); /* remember the pointer */
263	sv = NEWSV(0,0);
264	sv_setsv(sv,sarg[i]);
265	SSPUSHPTR(sv); /* remember the value */
266	SSPUSHINT(SAVEt_ITEM);
267	}
268	}
269
270	void
271	leave_scope(base)
272	I32 base;
273	{
274	register SV *sv;
275	register SV *value;
276	register GV *gv;
277	register AV *av;
278	register HV *hv;
279	register void* ptr;
280
281	if (base < -1)
463ee0b2	282	croak("panic: corrupt saved stack index");
79072805 LW	283	while (savestack_ix > base) {
	284	switch (SSPOPINT) {
	285	case SAVEt_ITEM: /* normal string */
	286	value = (SV*)SSPOPPTR;
	287	sv = (SV*)SSPOPPTR;
	288	sv_replace(sv,value);
	289	SvSETMAGIC(sv);
	290	break;
	291	case SAVEt_SV: /* scalar reference */
	292	value = (SV*)SSPOPPTR;
	293	gv = (GV*)SSPOPPTR;
	294	sv = GvSV(gv);
	295	if (SvTYPE(sv) >= SVt_PVMG)
	296	SvMAGIC(sv) = 0;
	297	sv_free(sv);
	298	GvSV(gv) = sv = value;
	299	SvSETMAGIC(sv);
	300	break;
	301	case SAVEt_SVREF: /* scalar reference */
	302	ptr = SSPOPPTR;
	303	sv = (SV*)ptr;
	304	if (SvTYPE(sv) >= SVt_PVMG)
	305	SvMAGIC(sv) = 0;
	306	sv_free(sv);
	307	(SV)ptr = sv = (SV)SSPOPPTR;
	308	SvSETMAGIC(sv);
	309	break;
	310	case SAVEt_AV: /* array reference */
	311	av = (AV*)SSPOPPTR;
	312	gv = (GV*)SSPOPPTR;
	313	av_free(GvAV(gv));
	314	GvAV(gv) = av;
	315	break;
	316	case SAVEt_HV: /* hash reference */
	317	hv = (HV*)SSPOPPTR;
	318	gv = (GV*)SSPOPPTR;
463ee0b2	319	(void)hv_free(GvHV(gv));
79072805 LW	320	GvHV(gv) = hv;
	321	break;
	322	case SAVEt_INT: /* int reference */
	323	ptr = SSPOPPTR;
	324	(int)ptr = (int)SSPOPINT;
	325	break;
	326	case SAVEt_I32: /* I32 reference */
	327	ptr = SSPOPPTR;
	328	(I32)ptr = (I32)SSPOPINT;
	329	break;
	330	case SAVEt_SPTR: /* SV* reference */
	331	ptr = SSPOPPTR;
	332	(SV)ptr = (SV)SSPOPPTR;
	333	break;
	334	case SAVEt_HPTR: /* HV* reference */
	335	ptr = SSPOPPTR;
	336	(HV)ptr = (HV)SSPOPPTR;
	337	break;
	338	case SAVEt_APTR: /* AV* reference */
	339	ptr = SSPOPPTR;
	340	(AV)ptr = (AV)SSPOPPTR;
	341	break;
	342	case SAVEt_NSTAB:
	343	gv = (GV*)SSPOPPTR;
	344	(void)sv_clear(gv);
	345	break;
	346	case SAVEt_GP: /* scalar reference */
	347	ptr = SSPOPPTR;
	348	gv = (GV*)SSPOPPTR;
	349	gp_free(gv);
	350	GvGP(gv) = (GP*)ptr;
	351	break;
	352	default:
463ee0b2	353	croak("panic: leave_scope inconsistency");
79072805 LW	354	}
	355	}
	356	}