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79072805 |
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; |
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76 | if (sv) { |
77 | #ifdef DEBUGGING |
78 | SvTEMP_off(sv); |
79 | #endif |
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80 | sv_free(sv); /* note, can modify tmps_ix!!! */ |
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81 | } |
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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); |
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98 | if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv)) { |
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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) |
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282 | croak("panic: corrupt saved stack index"); |
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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; |
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319 | (void)hv_free(GvHV(gv)); |
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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: |
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353 | croak("panic: leave_scope inconsistency"); |
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354 | } |
355 | } |
356 | } |