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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 | } |