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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; | |
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 | } |