1 #include "Python.h" 2 #include "code.h" 3 #include "structmember.h" 4 5 #define NAME_CHARS \ 6 "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz" 7 8 /* all_name_chars(s): true iff all chars in s are valid NAME_CHARS */ 9 10 static int 11 all_name_chars(PyObject *o) 12 { 13 static char ok_name_char[256]; 14 static const unsigned char *name_chars = (unsigned char *)NAME_CHARS; 15 const unsigned char *s, *e; 16 17 if (ok_name_char[*name_chars] == 0) { 18 const unsigned char *p; 19 for (p = name_chars; *p; p++) 20 ok_name_char[*p] = 1; 21 } 22 s = (unsigned char *)PyString_AS_STRING(o); 23 e = s + PyString_GET_SIZE(o); 24 while (s != e) { 25 if (ok_name_char[*s++] == 0) 26 return 0; 27 } 28 return 1; 29 } 30 31 static void 32 intern_strings(PyObject *tuple) 33 { 34 Py_ssize_t i; 35 36 for (i = PyTuple_GET_SIZE(tuple); --i >= 0; ) { 37 PyObject *v = PyTuple_GET_ITEM(tuple, i); 38 if (v == NULL || !PyString_CheckExact(v)) { 39 Py_FatalError("non-string found in code slot"); 40 } 41 PyString_InternInPlace(&PyTuple_GET_ITEM(tuple, i)); 42 } 43 } 44 45 /* Intern selected string constants */ 46 static int 47 intern_string_constants(PyObject *tuple) 48 { 49 int modified = 0; 50 Py_ssize_t i; 51 52 for (i = PyTuple_GET_SIZE(tuple); --i >= 0; ) { 53 PyObject *v = PyTuple_GET_ITEM(tuple, i); 54 if (PyString_CheckExact(v)) { 55 if (all_name_chars(v)) { 56 PyObject *w = v; 57 PyString_InternInPlace(&v); 58 if (w != v) { 59 PyTuple_SET_ITEM(tuple, i, v); 60 modified = 1; 61 } 62 } 63 } 64 else if (PyTuple_CheckExact(v)) { 65 intern_string_constants(v); 66 } 67 else if (PyFrozenSet_CheckExact(v)) { 68 PyObject *w = v; 69 PyObject *tmp = PySequence_Tuple(v); 70 if (tmp == NULL) { 71 PyErr_Clear(); 72 continue; 73 } 74 if (intern_string_constants(tmp)) { 75 v = PyFrozenSet_New(tmp); 76 if (v == NULL) { 77 PyErr_Clear(); 78 } 79 else { 80 PyTuple_SET_ITEM(tuple, i, v); 81 Py_DECREF(w); 82 modified = 1; 83 } 84 } 85 Py_DECREF(tmp); 86 } 87 } 88 return modified; 89 } 90 91 92 PyCodeObject * 93 PyCode_New(int argcount, int nlocals, int stacksize, int flags, 94 PyObject *code, PyObject *consts, PyObject *names, 95 PyObject *varnames, PyObject *freevars, PyObject *cellvars, 96 PyObject *filename, PyObject *name, int firstlineno, 97 PyObject *lnotab) 98 { 99 PyCodeObject *co; 100 /* Check argument types */ 101 if (argcount < 0 || nlocals < 0 || 102 code == NULL || 103 consts == NULL || !PyTuple_Check(consts) || 104 names == NULL || !PyTuple_Check(names) || 105 varnames == NULL || !PyTuple_Check(varnames) || 106 freevars == NULL || !PyTuple_Check(freevars) || 107 cellvars == NULL || !PyTuple_Check(cellvars) || 108 name == NULL || !PyString_Check(name) || 109 filename == NULL || !PyString_Check(filename) || 110 lnotab == NULL || !PyString_Check(lnotab) || 111 !PyObject_CheckReadBuffer(code)) { 112 PyErr_BadInternalCall(); 113 return NULL; 114 } 115 intern_strings(names); 116 intern_strings(varnames); 117 intern_strings(freevars); 118 intern_strings(cellvars); 119 intern_string_constants(consts); 120 co = PyObject_NEW(PyCodeObject, &PyCode_Type); 121 if (co != NULL) { 122 co->co_argcount = argcount; 123 co->co_nlocals = nlocals; 124 co->co_stacksize = stacksize; 125 co->co_flags = flags; 126 Py_INCREF(code); 127 co->co_code = code; 128 Py_INCREF(consts); 129 co->co_consts = consts; 130 Py_INCREF(names); 131 co->co_names = names; 132 Py_INCREF(varnames); 133 co->co_varnames = varnames; 134 Py_INCREF(freevars); 135 co->co_freevars = freevars; 136 Py_INCREF(cellvars); 137 co->co_cellvars = cellvars; 138 Py_INCREF(filename); 139 co->co_filename = filename; 140 Py_INCREF(name); 141 co->co_name = name; 142 co->co_firstlineno = firstlineno; 143 Py_INCREF(lnotab); 144 co->co_lnotab = lnotab; 145 co->co_zombieframe = NULL; 146 co->co_weakreflist = NULL; 147 } 148 return co; 149 } 150 151 PyCodeObject * 152 PyCode_NewEmpty(const char *filename, const char *funcname, int firstlineno) 153 { 154 static PyObject *emptystring = NULL; 155 static PyObject *nulltuple = NULL; 156 PyObject *filename_ob = NULL; 157 PyObject *funcname_ob = NULL; 158 PyCodeObject *result = NULL; 159 if (emptystring == NULL) { 160 emptystring = PyString_FromString(""); 161 if (emptystring == NULL) 162 goto failed; 163 } 164 if (nulltuple == NULL) { 165 nulltuple = PyTuple_New(0); 166 if (nulltuple == NULL) 167 goto failed; 168 } 169 funcname_ob = PyString_FromString(funcname); 170 if (funcname_ob == NULL) 171 goto failed; 172 filename_ob = PyString_FromString(filename); 173 if (filename_ob == NULL) 174 goto failed; 175 176 result = PyCode_New(0, /* argcount */ 177 0, /* nlocals */ 178 0, /* stacksize */ 179 0, /* flags */ 180 emptystring, /* code */ 181 nulltuple, /* consts */ 182 nulltuple, /* names */ 183 nulltuple, /* varnames */ 184 nulltuple, /* freevars */ 185 nulltuple, /* cellvars */ 186 filename_ob, /* filename */ 187 funcname_ob, /* name */ 188 firstlineno, /* firstlineno */ 189 emptystring /* lnotab */ 190 ); 191 192 failed: 193 Py_XDECREF(funcname_ob); 194 Py_XDECREF(filename_ob); 195 return result; 196 } 197 198 #define OFF(x) offsetof(PyCodeObject, x) 199 200 static PyMemberDef code_memberlist[] = { 201 {"co_argcount", T_INT, OFF(co_argcount), READONLY}, 202 {"co_nlocals", T_INT, OFF(co_nlocals), READONLY}, 203 {"co_stacksize",T_INT, OFF(co_stacksize), READONLY}, 204 {"co_flags", T_INT, OFF(co_flags), READONLY}, 205 {"co_code", T_OBJECT, OFF(co_code), READONLY}, 206 {"co_consts", T_OBJECT, OFF(co_consts), READONLY}, 207 {"co_names", T_OBJECT, OFF(co_names), READONLY}, 208 {"co_varnames", T_OBJECT, OFF(co_varnames), READONLY}, 209 {"co_freevars", T_OBJECT, OFF(co_freevars), READONLY}, 210 {"co_cellvars", T_OBJECT, OFF(co_cellvars), READONLY}, 211 {"co_filename", T_OBJECT, OFF(co_filename), READONLY}, 212 {"co_name", T_OBJECT, OFF(co_name), READONLY}, 213 {"co_firstlineno", T_INT, OFF(co_firstlineno), READONLY}, 214 {"co_lnotab", T_OBJECT, OFF(co_lnotab), READONLY}, 215 {NULL} /* Sentinel */ 216 }; 217 218 /* Helper for code_new: return a shallow copy of a tuple that is 219 guaranteed to contain exact strings, by converting string subclasses 220 to exact strings and complaining if a non-string is found. */ 221 static PyObject* 222 validate_and_copy_tuple(PyObject *tup) 223 { 224 PyObject *newtuple; 225 PyObject *item; 226 Py_ssize_t i, len; 227 228 len = PyTuple_GET_SIZE(tup); 229 newtuple = PyTuple_New(len); 230 if (newtuple == NULL) 231 return NULL; 232 233 for (i = 0; i < len; i++) { 234 item = PyTuple_GET_ITEM(tup, i); 235 if (PyString_CheckExact(item)) { 236 Py_INCREF(item); 237 } 238 else if (!PyString_Check(item)) { 239 PyErr_Format( 240 PyExc_TypeError, 241 "name tuples must contain only " 242 "strings, not '%.500s'", 243 item->ob_type->tp_name); 244 Py_DECREF(newtuple); 245 return NULL; 246 } 247 else { 248 item = PyString_FromStringAndSize( 249 PyString_AS_STRING(item), 250 PyString_GET_SIZE(item)); 251 if (item == NULL) { 252 Py_DECREF(newtuple); 253 return NULL; 254 } 255 } 256 PyTuple_SET_ITEM(newtuple, i, item); 257 } 258 259 return newtuple; 260 } 261 262 PyDoc_STRVAR(code_doc, 263 "code(argcount, nlocals, stacksize, flags, codestring, constants, names,\n\ 264 varnames, filename, name, firstlineno, lnotab[, freevars[, cellvars]])\n\ 265 \n\ 266 Create a code object. Not for the faint of heart."); 267 268 static PyObject * 269 code_new(PyTypeObject *type, PyObject *args, PyObject *kw) 270 { 271 int argcount; 272 int nlocals; 273 int stacksize; 274 int flags; 275 PyObject *co = NULL; 276 PyObject *code; 277 PyObject *consts; 278 PyObject *names, *ournames = NULL; 279 PyObject *varnames, *ourvarnames = NULL; 280 PyObject *freevars = NULL, *ourfreevars = NULL; 281 PyObject *cellvars = NULL, *ourcellvars = NULL; 282 PyObject *filename; 283 PyObject *name; 284 int firstlineno; 285 PyObject *lnotab; 286 287 if (!PyArg_ParseTuple(args, "iiiiSO!O!O!SSiS|O!O!:code", 288 &argcount, &nlocals, &stacksize, &flags, 289 &code, 290 &PyTuple_Type, &consts, 291 &PyTuple_Type, &names, 292 &PyTuple_Type, &varnames, 293 &filename, &name, 294 &firstlineno, &lnotab, 295 &PyTuple_Type, &freevars, 296 &PyTuple_Type, &cellvars)) 297 return NULL; 298 299 if (argcount < 0) { 300 PyErr_SetString( 301 PyExc_ValueError, 302 "code: argcount must not be negative"); 303 goto cleanup; 304 } 305 306 if (nlocals < 0) { 307 PyErr_SetString( 308 PyExc_ValueError, 309 "code: nlocals must not be negative"); 310 goto cleanup; 311 } 312 313 ournames = validate_and_copy_tuple(names); 314 if (ournames == NULL) 315 goto cleanup; 316 ourvarnames = validate_and_copy_tuple(varnames); 317 if (ourvarnames == NULL) 318 goto cleanup; 319 if (freevars) 320 ourfreevars = validate_and_copy_tuple(freevars); 321 else 322 ourfreevars = PyTuple_New(0); 323 if (ourfreevars == NULL) 324 goto cleanup; 325 if (cellvars) 326 ourcellvars = validate_and_copy_tuple(cellvars); 327 else 328 ourcellvars = PyTuple_New(0); 329 if (ourcellvars == NULL) 330 goto cleanup; 331 332 co = (PyObject *)PyCode_New(argcount, nlocals, stacksize, flags, 333 code, consts, ournames, ourvarnames, 334 ourfreevars, ourcellvars, filename, 335 name, firstlineno, lnotab); 336 cleanup: 337 Py_XDECREF(ournames); 338 Py_XDECREF(ourvarnames); 339 Py_XDECREF(ourfreevars); 340 Py_XDECREF(ourcellvars); 341 return co; 342 } 343 344 static void 345 code_dealloc(PyCodeObject *co) 346 { 347 Py_XDECREF(co->co_code); 348 Py_XDECREF(co->co_consts); 349 Py_XDECREF(co->co_names); 350 Py_XDECREF(co->co_varnames); 351 Py_XDECREF(co->co_freevars); 352 Py_XDECREF(co->co_cellvars); 353 Py_XDECREF(co->co_filename); 354 Py_XDECREF(co->co_name); 355 Py_XDECREF(co->co_lnotab); 356 if (co->co_zombieframe != NULL) 357 PyObject_GC_Del(co->co_zombieframe); 358 if (co->co_weakreflist != NULL) 359 PyObject_ClearWeakRefs((PyObject*)co); 360 PyObject_DEL(co); 361 } 362 363 static PyObject * 364 code_repr(PyCodeObject *co) 365 { 366 char buf[500]; 367 int lineno = -1; 368 char *filename = "???"; 369 char *name = "???"; 370 371 if (co->co_firstlineno != 0) 372 lineno = co->co_firstlineno; 373 if (co->co_filename && PyString_Check(co->co_filename)) 374 filename = PyString_AS_STRING(co->co_filename); 375 if (co->co_name && PyString_Check(co->co_name)) 376 name = PyString_AS_STRING(co->co_name); 377 PyOS_snprintf(buf, sizeof(buf), 378 "<code object %.100s at %p, file \"%.300s\", line %d>", 379 name, co, filename, lineno); 380 return PyString_FromString(buf); 381 } 382 383 static int 384 code_compare(PyCodeObject *co, PyCodeObject *cp) 385 { 386 int cmp; 387 cmp = PyObject_Compare(co->co_name, cp->co_name); 388 if (cmp) return cmp; 389 cmp = co->co_argcount - cp->co_argcount; 390 if (cmp) goto normalize; 391 cmp = co->co_nlocals - cp->co_nlocals; 392 if (cmp) goto normalize; 393 cmp = co->co_flags - cp->co_flags; 394 if (cmp) goto normalize; 395 cmp = co->co_firstlineno - cp->co_firstlineno; 396 if (cmp) goto normalize; 397 cmp = PyObject_Compare(co->co_code, cp->co_code); 398 if (cmp) return cmp; 399 cmp = PyObject_Compare(co->co_consts, cp->co_consts); 400 if (cmp) return cmp; 401 cmp = PyObject_Compare(co->co_names, cp->co_names); 402 if (cmp) return cmp; 403 cmp = PyObject_Compare(co->co_varnames, cp->co_varnames); 404 if (cmp) return cmp; 405 cmp = PyObject_Compare(co->co_freevars, cp->co_freevars); 406 if (cmp) return cmp; 407 cmp = PyObject_Compare(co->co_cellvars, cp->co_cellvars); 408 return cmp; 409 410 normalize: 411 if (cmp > 0) 412 return 1; 413 else if (cmp < 0) 414 return -1; 415 else 416 return 0; 417 } 418 419 PyObject* 420 _PyCode_ConstantKey(PyObject *op) 421 { 422 PyObject *key; 423 424 /* Py_None is a singleton */ 425 if (op == Py_None 426 || PyInt_CheckExact(op) 427 || PyLong_CheckExact(op) 428 || PyBool_Check(op) 429 || PyBytes_CheckExact(op) 430 #ifdef Py_USING_UNICODE 431 || PyUnicode_CheckExact(op) 432 #endif 433 /* code_richcompare() uses _PyCode_ConstantKey() internally */ 434 || PyCode_Check(op)) { 435 key = PyTuple_Pack(2, Py_TYPE(op), op); 436 } 437 else if (PyFloat_CheckExact(op)) { 438 double d = PyFloat_AS_DOUBLE(op); 439 /* all we need is to make the tuple different in either the 0.0 440 * or -0.0 case from all others, just to avoid the "coercion". 441 */ 442 if (d == 0.0 && copysign(1.0, d) < 0.0) 443 key = PyTuple_Pack(3, Py_TYPE(op), op, Py_None); 444 else 445 key = PyTuple_Pack(2, Py_TYPE(op), op); 446 } 447 #ifndef WITHOUT_COMPLEX 448 else if (PyComplex_CheckExact(op)) { 449 Py_complex z; 450 int real_negzero, imag_negzero; 451 /* For the complex case we must make complex(x, 0.) 452 different from complex(x, -0.) and complex(0., y) 453 different from complex(-0., y), for any x and y. 454 All four complex zeros must be distinguished.*/ 455 z = PyComplex_AsCComplex(op); 456 real_negzero = z.real == 0.0 && copysign(1.0, z.real) < 0.0; 457 imag_negzero = z.imag == 0.0 && copysign(1.0, z.imag) < 0.0; 458 /* use True, False and None singleton as tags for the real and imag 459 * sign, to make tuples different */ 460 if (real_negzero && imag_negzero) { 461 key = PyTuple_Pack(3, Py_TYPE(op), op, Py_True); 462 } 463 else if (imag_negzero) { 464 key = PyTuple_Pack(3, Py_TYPE(op), op, Py_False); 465 } 466 else if (real_negzero) { 467 key = PyTuple_Pack(3, Py_TYPE(op), op, Py_None); 468 } 469 else { 470 key = PyTuple_Pack(2, Py_TYPE(op), op); 471 } 472 } 473 #endif 474 else if (PyTuple_CheckExact(op)) { 475 Py_ssize_t i, len; 476 PyObject *tuple; 477 478 len = PyTuple_GET_SIZE(op); 479 tuple = PyTuple_New(len); 480 if (tuple == NULL) 481 return NULL; 482 483 for (i=0; i < len; i++) { 484 PyObject *item, *item_key; 485 486 item = PyTuple_GET_ITEM(op, i); 487 item_key = _PyCode_ConstantKey(item); 488 if (item_key == NULL) { 489 Py_DECREF(tuple); 490 return NULL; 491 } 492 493 PyTuple_SET_ITEM(tuple, i, item_key); 494 } 495 496 key = PyTuple_Pack(3, Py_TYPE(op), op, tuple); 497 Py_DECREF(tuple); 498 } 499 else if (PyFrozenSet_CheckExact(op)) { 500 Py_ssize_t pos = 0; 501 PyObject *item; 502 long hash; 503 Py_ssize_t i, len; 504 PyObject *tuple, *set; 505 506 len = PySet_GET_SIZE(op); 507 tuple = PyTuple_New(len); 508 if (tuple == NULL) 509 return NULL; 510 511 i = 0; 512 while (_PySet_NextEntry(op, &pos, &item, &hash)) { 513 PyObject *item_key; 514 515 item_key = _PyCode_ConstantKey(item); 516 if (item_key == NULL) { 517 Py_DECREF(tuple); 518 return NULL; 519 } 520 521 assert(i < len); 522 PyTuple_SET_ITEM(tuple, i, item_key); 523 i++; 524 } 525 set = PyFrozenSet_New(tuple); 526 Py_DECREF(tuple); 527 if (set == NULL) 528 return NULL; 529 530 key = PyTuple_Pack(3, Py_TYPE(op), op, set); 531 Py_DECREF(set); 532 return key; 533 } 534 else { 535 /* for other types, use the object identifier as a unique identifier 536 * to ensure that they are seen as unequal. */ 537 PyObject *obj_id = PyLong_FromVoidPtr(op); 538 if (obj_id == NULL) 539 return NULL; 540 541 key = PyTuple_Pack(3, Py_TYPE(op), op, obj_id); 542 Py_DECREF(obj_id); 543 } 544 return key; 545 } 546 547 static PyObject * 548 code_richcompare(PyObject *self, PyObject *other, int op) 549 { 550 PyCodeObject *co, *cp; 551 int eq; 552 PyObject *consts1, *consts2; 553 PyObject *res; 554 555 if ((op != Py_EQ && op != Py_NE) || 556 !PyCode_Check(self) || 557 !PyCode_Check(other)) { 558 559 /* Py3K warning if types are not equal and comparison 560 isn't == or != */ 561 if (PyErr_WarnPy3k("code inequality comparisons not supported " 562 "in 3.x", 1) < 0) { 563 return NULL; 564 } 565 566 Py_INCREF(Py_NotImplemented); 567 return Py_NotImplemented; 568 } 569 570 co = (PyCodeObject *)self; 571 cp = (PyCodeObject *)other; 572 573 eq = PyObject_RichCompareBool(co->co_name, cp->co_name, Py_EQ); 574 if (eq <= 0) goto unequal; 575 eq = co->co_argcount == cp->co_argcount; 576 if (!eq) goto unequal; 577 eq = co->co_nlocals == cp->co_nlocals; 578 if (!eq) goto unequal; 579 eq = co->co_flags == cp->co_flags; 580 if (!eq) goto unequal; 581 eq = co->co_firstlineno == cp->co_firstlineno; 582 if (!eq) goto unequal; 583 eq = PyObject_RichCompareBool(co->co_code, cp->co_code, Py_EQ); 584 if (eq <= 0) goto unequal; 585 586 /* compare constants */ 587 consts1 = _PyCode_ConstantKey(co->co_consts); 588 if (!consts1) 589 return NULL; 590 consts2 = _PyCode_ConstantKey(cp->co_consts); 591 if (!consts2) { 592 Py_DECREF(consts1); 593 return NULL; 594 } 595 eq = PyObject_RichCompareBool(consts1, consts2, Py_EQ); 596 Py_DECREF(consts1); 597 Py_DECREF(consts2); 598 if (eq <= 0) goto unequal; 599 600 eq = PyObject_RichCompareBool(co->co_names, cp->co_names, Py_EQ); 601 if (eq <= 0) goto unequal; 602 eq = PyObject_RichCompareBool(co->co_varnames, cp->co_varnames, Py_EQ); 603 if (eq <= 0) goto unequal; 604 eq = PyObject_RichCompareBool(co->co_freevars, cp->co_freevars, Py_EQ); 605 if (eq <= 0) goto unequal; 606 eq = PyObject_RichCompareBool(co->co_cellvars, cp->co_cellvars, Py_EQ); 607 if (eq <= 0) goto unequal; 608 609 if (op == Py_EQ) 610 res = Py_True; 611 else 612 res = Py_False; 613 goto done; 614 615 unequal: 616 if (eq < 0) 617 return NULL; 618 if (op == Py_NE) 619 res = Py_True; 620 else 621 res = Py_False; 622 623 done: 624 Py_INCREF(res); 625 return res; 626 } 627 628 static long 629 code_hash(PyCodeObject *co) 630 { 631 long h, h0, h1, h2, h3, h4, h5, h6; 632 h0 = PyObject_Hash(co->co_name); 633 if (h0 == -1) return -1; 634 h1 = PyObject_Hash(co->co_code); 635 if (h1 == -1) return -1; 636 h2 = PyObject_Hash(co->co_consts); 637 if (h2 == -1) return -1; 638 h3 = PyObject_Hash(co->co_names); 639 if (h3 == -1) return -1; 640 h4 = PyObject_Hash(co->co_varnames); 641 if (h4 == -1) return -1; 642 h5 = PyObject_Hash(co->co_freevars); 643 if (h5 == -1) return -1; 644 h6 = PyObject_Hash(co->co_cellvars); 645 if (h6 == -1) return -1; 646 h = h0 ^ h1 ^ h2 ^ h3 ^ h4 ^ h5 ^ h6 ^ 647 co->co_argcount ^ co->co_nlocals ^ co->co_flags; 648 if (h == -1) h = -2; 649 return h; 650 } 651 652 /* XXX code objects need to participate in GC? */ 653 654 PyTypeObject PyCode_Type = { 655 PyVarObject_HEAD_INIT(&PyType_Type, 0) 656 "code", 657 sizeof(PyCodeObject), 658 0, 659 (destructor)code_dealloc, /* tp_dealloc */ 660 0, /* tp_print */ 661 0, /* tp_getattr */ 662 0, /* tp_setattr */ 663 (cmpfunc)code_compare, /* tp_compare */ 664 (reprfunc)code_repr, /* tp_repr */ 665 0, /* tp_as_number */ 666 0, /* tp_as_sequence */ 667 0, /* tp_as_mapping */ 668 (hashfunc)code_hash, /* tp_hash */ 669 0, /* tp_call */ 670 0, /* tp_str */ 671 PyObject_GenericGetAttr, /* tp_getattro */ 672 0, /* tp_setattro */ 673 0, /* tp_as_buffer */ 674 Py_TPFLAGS_DEFAULT, /* tp_flags */ 675 code_doc, /* tp_doc */ 676 0, /* tp_traverse */ 677 0, /* tp_clear */ 678 code_richcompare, /* tp_richcompare */ 679 offsetof(PyCodeObject, co_weakreflist), /* tp_weaklistoffset */ 680 0, /* tp_iter */ 681 0, /* tp_iternext */ 682 0, /* tp_methods */ 683 code_memberlist, /* tp_members */ 684 0, /* tp_getset */ 685 0, /* tp_base */ 686 0, /* tp_dict */ 687 0, /* tp_descr_get */ 688 0, /* tp_descr_set */ 689 0, /* tp_dictoffset */ 690 0, /* tp_init */ 691 0, /* tp_alloc */ 692 code_new, /* tp_new */ 693 }; 694 695 /* Use co_lnotab to compute the line number from a bytecode index, addrq. See 696 lnotab_notes.txt for the details of the lnotab representation. 697 */ 698 699 int 700 PyCode_Addr2Line(PyCodeObject *co, int addrq) 701 { 702 int size = PyString_Size(co->co_lnotab) / 2; 703 unsigned char *p = (unsigned char*)PyString_AsString(co->co_lnotab); 704 int line = co->co_firstlineno; 705 int addr = 0; 706 while (--size >= 0) { 707 addr += *p++; 708 if (addr > addrq) 709 break; 710 line += *p++; 711 } 712 return line; 713 } 714 715 /* Update *bounds to describe the first and one-past-the-last instructions in 716 the same line as lasti. Return the number of that line. */ 717 int 718 _PyCode_CheckLineNumber(PyCodeObject* co, int lasti, PyAddrPair *bounds) 719 { 720 int size, addr, line; 721 unsigned char* p; 722 723 p = (unsigned char*)PyString_AS_STRING(co->co_lnotab); 724 size = PyString_GET_SIZE(co->co_lnotab) / 2; 725 726 addr = 0; 727 line = co->co_firstlineno; 728 assert(line > 0); 729 730 /* possible optimization: if f->f_lasti == instr_ub 731 (likely to be a common case) then we already know 732 instr_lb -- if we stored the matching value of p 733 somewhere we could skip the first while loop. */ 734 735 /* See lnotab_notes.txt for the description of 736 co_lnotab. A point to remember: increments to p 737 come in (addr, line) pairs. */ 738 739 bounds->ap_lower = 0; 740 while (size > 0) { 741 if (addr + *p > lasti) 742 break; 743 addr += *p++; 744 if (*p) 745 bounds->ap_lower = addr; 746 line += *p++; 747 --size; 748 } 749 750 if (size > 0) { 751 while (--size >= 0) { 752 addr += *p++; 753 if (*p++) 754 break; 755 } 756 bounds->ap_upper = addr; 757 } 758 else { 759 bounds->ap_upper = INT_MAX; 760 } 761 762 return line; 763 } 764
