1 #define PERL_NO_GET_CONTEXT 2 #include "EXTERN.h" 3 #include "perl.h" 4 #include "XSUB.h" 5 6 /* PL_maxo shouldn't differ from MAXO but leave room anyway (see BOOT:) */ 7 #define OP_MASK_BUF_SIZE (MAXO + 100) 8 9 /* XXX op_named_bits and opset_all are never freed */ 10 #define MY_CXT_KEY "Opcode::_guts" XS_VERSION 11 12 typedef struct { 13 HV * x_op_named_bits; /* cache shared for whole process */ 14 SV * x_opset_all; /* mask with all bits set */ 15 IV x_opset_len; /* length of opmasks in bytes */ 16 int x_opcode_debug; 17 } my_cxt_t; 18 19 START_MY_CXT 20 21 #define op_named_bits (MY_CXT.x_op_named_bits) 22 #define opset_all (MY_CXT.x_opset_all) 23 #define opset_len (MY_CXT.x_opset_len) 24 #define opcode_debug (MY_CXT.x_opcode_debug) 25 26 static SV *new_opset (pTHX_ SV *old_opset); 27 static int verify_opset (pTHX_ SV *opset, int fatal); 28 static void set_opset_bits (pTHX_ char *bitmap, SV *bitspec, int on, const char *opname); 29 static void put_op_bitspec (pTHX_ const char *optag, STRLEN len, SV *opset); 30 static SV *get_op_bitspec (pTHX_ const char *opname, STRLEN len, int fatal); 31 32 33 /* Initialise our private op_named_bits HV. 34 * It is first loaded with the name and number of each perl operator. 35 * Then the builtin tags :none and :all are added. 36 * Opcode.pm loads the standard optags from __DATA__ 37 * XXX leak-alert: data allocated here is never freed, call this 38 * at most once 39 */ 40 41 static void 42 op_names_init(pTHX) 43 10 { 44 10 int i; 45 10 STRLEN len; 46 10 char **op_names; 47 10 char *bitmap; 48 dMY_CXT; 49 50 10 op_named_bits = newHV(); 51 10 op_names = get_op_names(); 52 3550 for(i=0; i < PL_maxo; ++i) { 53 3540 SV * const sv = newSViv(i); 54 3540 SvREADONLY_on(sv); 55 3540 hv_store(op_named_bits, op_names[i], strlen(op_names[i]), sv, 0); 56 } 57 58 10 put_op_bitspec(aTHX_ ":none",0, sv_2mortal(new_opset(aTHX_ Nullsv))); 59 60 10 opset_all = new_opset(aTHX_ Nullsv); 61 10 bitmap = SvPV(opset_all, len); 62 10 i = len-1; /* deal with last byte specially, see below */ 63 450 while(i-- > 0) 64 440 bitmap[i] = (char)0xFF; 65 /* Take care to set the right number of bits in the last byte */ 66 10 bitmap[len-1] = (PL_maxo & 0x07) ? ~(0xFF << (PL_maxo & 0x07)) : 0xFF; 67 10 put_op_bitspec(aTHX_ ":all",0, opset_all); /* don't mortalise */ 68 } 69 70 71 /* Store a new tag definition. Always a mask. 72 * The tag must not already be defined. 73 * SV *mask is copied not referenced. 74 */ 75 76 static void 77 put_op_bitspec(pTHX_ const char *optag, STRLEN len, SV *mask) 78 201 { 79 201 SV **svp; 80 dMY_CXT; 81 82 201 verify_opset(aTHX_ mask,1); 83 201 if (!len) 84 20 len = strlen(optag); 85 201 svp = hv_fetch(op_named_bits, optag, len, 1); 86 201 if (SvOK(*svp)) 87 ###### croak("Opcode tag \"%s\" already defined", optag); 88 201 sv_setsv(*svp, mask); 89 201 SvREADONLY_on(*svp); 90 } 91 92 93 94 /* Fetch a 'bits' entry for an opname or optag (IV/PV). 95 * Note that we return the actual entry for speed. 96 * Always sv_mortalcopy() if returing it to user code. 97 */ 98 99 static SV * 100 get_op_bitspec(pTHX_ const char *opname, STRLEN len, int fatal) 101 4406 { 102 4406 SV **svp; 103 dMY_CXT; 104 105 4406 if (!len) 106 ###### len = strlen(opname); 107 4406 svp = hv_fetch(op_named_bits, opname, len, 0); 108 4406 if (!svp || !SvOK(*svp)) { 109 2 if (!fatal) 110 ###### return Nullsv; 111 2 if (*opname == ':') 112 1 croak("Unknown operator tag \"%s\"", opname); 113 1 if (*opname == '!') /* XXX here later, or elsewhere? */ 114 ###### croak("Can't negate operators here (\"%s\")", opname); 115 1 if (isALPHA(*opname)) 116 1 croak("Unknown operator name \"%s\"", opname); 117 ###### croak("Unknown operator prefix \"%s\"", opname); 118 } 119 4404 return *svp; 120 } 121 122 123 124 static SV * 125 new_opset(pTHX_ SV *old_opset) 126 1158 { 127 1158 SV *opset; 128 dMY_CXT; 129 130 1158 if (old_opset) { 131 323 verify_opset(aTHX_ old_opset,1); 132 323 opset = newSVsv(old_opset); 133 } 134 else { 135 835 opset = NEWSV(1156, opset_len); 136 835 Zero(SvPVX_const(opset), opset_len + 1, char); 137 835 SvCUR_set(opset, opset_len); 138 835 (void)SvPOK_only(opset); 139 } 140 /* not mortalised here */ 141 1158 return opset; 142 } 143 144 145 static int 146 verify_opset(pTHX_ SV *opset, int fatal) 147 5288 { 148 5288 const char *err = Nullch; 149 dMY_CXT; 150 151 5288 if (!SvOK(opset)) err = "undefined"; 152 5288 else if (!SvPOK(opset)) err = "wrong type"; 153 5287 else if (SvCUR(opset) != (STRLEN)opset_len) err = "wrong size"; 154 5288 if (err && fatal) { 155 ###### croak("Invalid opset: %s", err); 156 } 157 5288 return !err; 158 } 159 160 161 static void 162 set_opset_bits(pTHX_ char *bitmap, SV *bitspec, int on, const char *opname) 163 4407 { 164 dMY_CXT; 165 166 4407 if (SvIOK(bitspec)) { 167 3998 const int myopcode = SvIV(bitspec); 168 3998 const int offset = myopcode >> 3; 169 3998 const int bit = myopcode & 0x07; 170 3998 if (myopcode >= PL_maxo || myopcode < 0) 171 ###### croak("panic: opcode \"%s\" value %d is invalid", opname, myopcode); 172 3998 if (opcode_debug >= 2) 173 ###### warn("set_opset_bits bit %2d (off=%d, bit=%d) %s %s\n", 174 myopcode, offset, bit, opname, (on)?"on":"off"); 175 3998 if (on) 176 3997 bitmap[offset] |= 1 << bit; 177 else 178 1 bitmap[offset] &= ~(1 << bit); 179 } 180 409 else if (SvPOK(bitspec) && SvCUR(bitspec) == (STRLEN)opset_len) { 181 182 409 STRLEN len; 183 409 const char * const specbits = SvPV(bitspec, len); 184 409 if (opcode_debug >= 2) 185 ###### warn("set_opset_bits opset %s %s\n", opname, (on)?"on":"off"); 186 409 if (on) 187 18814 while(len-- > 0) bitmap[len] |= specbits[len]; 188 else 189 ###### while(len-- > 0) bitmap[len] &= ~specbits[len]; 190 } 191 else 192 ###### croak("panic: invalid bitspec for \"%s\" (type %u)", 193 opname, (unsigned)SvTYPE(bitspec)); 194 } 195 196 197 static void 198 opmask_add(pTHX_ SV *opset) /* THE ONLY FUNCTION TO EDIT PL_op_mask ITSELF */ 199 335 { 200 335 int i,j; 201 335 char *bitmask; 202 335 STRLEN len; 203 335 int myopcode = 0; 204 dMY_CXT; 205 206 335 verify_opset(aTHX_ opset,1); /* croaks on bad opset */ 207 208 335 if (!PL_op_mask) /* caller must ensure PL_op_mask exists */ 209 ###### croak("Can't add to uninitialised PL_op_mask"); 210 211 /* OPCODES ALREADY MASKED ARE NEVER UNMASKED. See opmask_addlocal() */ 212 213 335 bitmask = SvPV(opset, len); 214 15410 for (i=0; i < opset_len; i++) { 215 15075 const U16 bits = bitmask[i]; 216 15075 if (!bits) { /* optimise for sparse masks */ 217 13965 myopcode += 8; 218 13965 continue; 219 } 220 9984 for (j=0; j < 8 && myopcode < PL_maxo; ) 221 8874 PL_op_mask[myopcode++] |= bits & (1 << j++); 222 } 223 } 224 225 static void 226 opmask_addlocal(pTHX_ SV *opset, char *op_mask_buf) /* Localise PL_op_mask then opmask_add() */ 227 332 { 228 332 char *orig_op_mask = PL_op_mask; 229 dMY_CXT; 230 231 332 SAVEVPTR(PL_op_mask); 232 /* XXX casting to an ordinary function ptr from a member function ptr 233 * is disallowed by Borland 234 */ 235 332 if (opcode_debug >= 2) 236 ###### SAVEDESTRUCTOR((void(*)(void*))Perl_warn,"PL_op_mask restored"); 237 332 PL_op_mask = &op_mask_buf[0]; 238 332 if (orig_op_mask) 239 ###### Copy(orig_op_mask, PL_op_mask, PL_maxo, char); 240 else 241 332 Zero(PL_op_mask, PL_maxo, char); 242 332 opmask_add(aTHX_ opset); 243 } 244 245 246 247 MODULE = Opcode PACKAGE = Opcode 248 249 PROTOTYPES: ENABLE 250 251 BOOT: 252 { 253 10 MY_CXT_INIT; 254 10 assert(PL_maxo < OP_MASK_BUF_SIZE); 255 10 opset_len = (PL_maxo + 7) / 8; 256 10 if (opcode_debug >= 1) 257 ###### warn("opset_len %ld\n", (long)opset_len); 258 10 op_names_init(aTHX); 259 } 260 261 void 262 _safe_pkg_prep(Package) 263 const char *Package 264 PPCODE: 265 308 HV *hv; 266 308 ENTER; 267 268 308 hv = gv_stashpv(Package, GV_ADDWARN); /* should exist already */ 269 270 308 if (strNE(HvNAME_get(hv),"main")) { 271 /* make it think it's in main:: */ 272 308 Perl_hv_name_set(aTHX_ hv, "main", 4, 0); 273 308 hv_store(hv,"_",1,(SV *)PL_defgv,0); /* connect _ to global */ 274 308 SvREFCNT_inc((SV *)PL_defgv); /* want to keep _ around! */ 275 } 276 308 LEAVE; 277 278 279 280 281 282 void 283 _safe_call_sv(Package, mask, codesv) 284 char * Package 285 SV * mask 286 SV * codesv 287 PPCODE: 288 332 char op_mask_buf[OP_MASK_BUF_SIZE]; 289 332 GV *gv; 290 332 HV *dummy_hv; 291 292 332 ENTER; 293 294 332 opmask_addlocal(aTHX_ mask, op_mask_buf); 295 296 332 save_aptr(&PL_endav); 297 332 PL_endav = (AV*)sv_2mortal((SV*)newAV()); /* ignore END blocks for now */ 298 299 332 save_hptr(&PL_defstash); /* save current default stash */ 300 /* the assignment to global defstash changes our sense of 'main' */ 301 332 PL_defstash = gv_stashpv(Package, GV_ADDWARN); /* should exist already */ 302 303 332 save_hptr(&PL_curstash); 304 332 PL_curstash = PL_defstash; 305 306 /* defstash must itself contain a main:: so we'll add that now */ 307 /* take care with the ref counts (was cause of long standing bug) */ 308 /* XXX I'm still not sure if this is right, GV_ADDWARN should warn! */ 309 332 gv = gv_fetchpv("main::", GV_ADDWARN, SVt_PVHV); 310 332 sv_free((SV*)GvHV(gv)); 311 332 GvHV(gv) = (HV*)SvREFCNT_inc(PL_defstash); 312 313 /* %INC must be clean for use/require in compartment */ 314 332 dummy_hv = save_hash(PL_incgv); 315 332 GvHV(PL_incgv) = (HV*)SvREFCNT_inc(GvHV(gv_HVadd(gv_fetchpv("INC",TRUE,SVt_PVHV)))); 316 317 332 PUSHMARK(SP); 318 332 perl_call_sv(codesv, GIMME|G_EVAL|G_KEEPERR); /* use callers context */ 319 332 sv_free( (SV *) dummy_hv); /* get rid of what save_hash gave us*/ 320 332 SPAGAIN; /* for the PUTBACK added by xsubpp */ 321 332 LEAVE; 322 323 324 int 325 verify_opset(opset, fatal = 0) 326 SV *opset 327 int fatal 328 CODE: 329 2 RETVAL = verify_opset(aTHX_ opset,fatal); 330 OUTPUT: 331 RETVAL 332 333 void 334 invert_opset(opset) 335 SV *opset 336 CODE: 337 { 338 312 char *bitmap; 339 dMY_CXT; 340 312 STRLEN len = opset_len; 341 342 312 opset = sv_2mortal(new_opset(aTHX_ opset)); /* verify and clone opset */ 343 312 bitmap = SvPVX(opset); 344 14352 while(len-- > 0) 345 14040 bitmap[len] = ~bitmap[len]; 346 /* take care of extra bits beyond PL_maxo in last byte */ 347 312 if (PL_maxo & 07) 348 312 bitmap[opset_len-1] &= ~(0xFF << (PL_maxo & 0x07)); 349 } 350 312 ST(0) = opset; 351 352 353 void 354 opset_to_ops(opset, desc = 0) 355 SV *opset 356 int desc 357 PPCODE: 358 { 359 18 STRLEN len; 360 18 int i, j, myopcode; 361 18 const char * const bitmap = SvPV(opset, len); 362 18 char **names = (desc) ? get_op_descs() : get_op_names(); 363 dMY_CXT; 364 365 18 verify_opset(aTHX_ opset,1); 366 828 for (myopcode=0, i=0; i < opset_len; i++) { 367 810 const U16 bits = bitmap[i]; 368 7182 for (j=0; j < 8 && myopcode < PL_maxo; j++, myopcode++) { 369 6372 if ( bits & (1 << j) ) 370 5439 XPUSHs(sv_2mortal(newSVpv(names[myopcode], 0))); 371 } 372 } 373 } 374 375 376 void 377 opset(...) 378 CODE: 379 810 int i; 380 810 SV *bitspec; 381 810 STRLEN len, on; 382 383 810 SV * const opset = sv_2mortal(new_opset(aTHX_ Nullsv)); 384 810 char * const bitmap = SvPVX(opset); 385 5217 for (i = 0; i < items; i++) { 386 4409 const char *opname; 387 4409 on = 1; 388 4409 if (verify_opset(aTHX_ ST(i),0)) { 389 6 opname = "(opset)"; 390 6 bitspec = ST(i); 391 } 392 else { 393 4403 opname = SvPV(ST(i), len); 394 4403 if (*opname == '!') { on=0; ++opname;--len; } 395 4403 bitspec = get_op_bitspec(aTHX_ opname, len, 1); 396 } 397 4407 set_opset_bits(aTHX_ bitmap, bitspec, on, opname); 398 } 399 808 ST(0) = opset; 400 401 402 #define PERMITING (ix == 0 || ix == 1) 403 #define ONLY_THESE (ix == 0 || ix == 2) 404 405 void 406 permit_only(safe, ...) 407 SV *safe 408 ALIAS: 409 permit = 1 410 deny_only = 2 411 deny = 3 412 CODE: 413 ###### int i; 414 ###### SV *bitspec, *mask; 415 ###### char *bitmap; 416 ###### STRLEN len; 417 dMY_CXT; 418 419 ###### if (!SvROK(safe) || !SvOBJECT(SvRV(safe)) || SvTYPE(SvRV(safe))!=SVt_PVHV) 420 ###### croak("Not a Safe object"); 421 ###### mask = *hv_fetch((HV*)SvRV(safe), "Mask",4, 1); 422 ###### if (ONLY_THESE) /* *_only = new mask, else edit current */ 423 ###### sv_setsv(mask, sv_2mortal(new_opset(aTHX_ PERMITING ? opset_all : Nullsv))); 424 else 425 ###### verify_opset(aTHX_ mask,1); /* croaks */ 426 ###### bitmap = SvPVX(mask); 427 ###### for (i = 1; i < items; i++) { 428 ###### const char *opname; 429 ###### int on = PERMITING ? 0 : 1; /* deny = mask bit on */ 430 ###### if (verify_opset(aTHX_ ST(i),0)) { /* it's a valid mask */ 431 ###### opname = "(opset)"; 432 ###### bitspec = ST(i); 433 } 434 else { /* it's an opname/optag */ 435 ###### opname = SvPV(ST(i), len); 436 /* invert if op has ! prefix (only one allowed) */ 437 ###### if (*opname == '!') { on = !on; ++opname; --len; } 438 ###### bitspec = get_op_bitspec(aTHX_ opname, len, 1); /* croaks */ 439 } 440 ###### set_opset_bits(aTHX_ bitmap, bitspec, on, opname); 441 } 442 ###### ST(0) = &PL_sv_yes; 443 444 445 446 void 447 opdesc(...) 448 PPCODE: 449 2 int i; 450 2 STRLEN len; 451 2 SV **args; 452 2 char **op_desc = get_op_descs(); 453 dMY_CXT; 454 455 /* copy args to a scratch area since we may push output values onto */ 456 /* the stack faster than we read values off it if masks are used. */ 457 2 args = (SV**)SvPVX(sv_2mortal(newSVpvn((char*)&ST(0), items*sizeof(SV*)))); 458 5 for (i = 0; i < items; i++) { 459 3 const char * const opname = SvPV(args[i], len); 460 3 SV *bitspec = get_op_bitspec(aTHX_ opname, len, 1); 461 3 if (SvIOK(bitspec)) { 462 2 const int myopcode = SvIV(bitspec); 463 2 if (myopcode < 0 || myopcode >= PL_maxo) 464 ###### croak("panic: opcode %d (%s) out of range",myopcode,opname); 465 2 XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0))); 466 } 467 1 else if (SvPOK(bitspec) && SvCUR(bitspec) == (STRLEN)opset_len) { 468 1 int b, j; 469 1 STRLEN n_a; 470 1 const char * const bitmap = SvPV(bitspec,n_a); 471 1 int myopcode = 0; 472 46 for (b=0; b < opset_len; b++) { 473 45 const U16 bits = bitmap[b]; 474 399 for (j=0; j < 8 && myopcode < PL_maxo; j++, myopcode++) 475 354 if (bits & (1 << j)) 476 3 XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0))); 477 } 478 } 479 else 480 ###### croak("panic: invalid bitspec for \"%s\" (type %u)", 481 opname, (unsigned)SvTYPE(bitspec)); 482 } 483 484 485 void 486 define_optag(optagsv, mask) 487 SV *optagsv 488 SV *mask 489 CODE: 490 181 STRLEN len; 491 181 const char *optag = SvPV(optagsv, len); 492 493 181 put_op_bitspec(aTHX_ optag, len, mask); /* croaks */ 494 181 ST(0) = &PL_sv_yes; 495 496 497 void 498 empty_opset() 499 CODE: 500 3 ST(0) = sv_2mortal(new_opset(aTHX_ Nullsv)); 501 502 void 503 full_opset() 504 CODE: 505 dMY_CXT; 506 11 ST(0) = sv_2mortal(new_opset(aTHX_ opset_all)); 507 508 void 509 opmask_add(opset) 510 SV *opset 511 PREINIT: 512 3 if (!PL_op_mask) 513 2 Newz(0, PL_op_mask, PL_maxo, char); 514 CODE: 515 3 opmask_add(aTHX_ opset); 516 517 void 518 opcodes() 519 PPCODE: 520 5 if (GIMME == G_ARRAY) { 521 ###### croak("opcodes in list context not yet implemented"); /* XXX */ 522 } 523 else { 524 5 XPUSHs(sv_2mortal(newSViv(PL_maxo))); 525 } 526 527 void 528 opmask() 529 CODE: 530 2 ST(0) = sv_2mortal(new_opset(aTHX_ Nullsv)); 531 2 if (PL_op_mask) { 532 ###### char * const bitmap = SvPVX(ST(0)); 533 ###### int myopcode; 534 ###### for(myopcode=0; myopcode < PL_maxo; ++myopcode) { 535 ###### if (PL_op_mask[myopcode]) 536 ###### bitmap[myopcode >> 3] |= 1 << (myopcode & 0x07); 537 } 538 } 539 540