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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); |
| 93a17b20 |
94 | if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv)) { |
| 79072805 |
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 | } |
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