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