Mercurial > cpython-lru_cache-weakref
annotate Objects/codeobject.c @ 47294:4fe192d48960 legacy-trunk
Renamed PyString to PyBytes
| author | Christian Heimes <christian@cheimes.de> |
|---|---|
| date | Mon, 26 May 2008 12:51:38 +0000 |
| parents | 7670005da8c5 |
| children | 52294af4b663 |
| rev | line source |
|---|---|
| 35742 | 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(unsigned char *s) | |
| 12 { | |
| 13 static char ok_name_char[256]; | |
| 14 static unsigned char *name_chars = (unsigned char *)NAME_CHARS; | |
| 15 | |
| 16 if (ok_name_char[*name_chars] == 0) { | |
| 17 unsigned char *p; | |
| 18 for (p = name_chars; *p; p++) | |
| 19 ok_name_char[*p] = 1; | |
| 20 } | |
| 21 while (*s) { | |
| 22 if (ok_name_char[*s++] == 0) | |
| 23 return 0; | |
| 24 } | |
| 25 return 1; | |
| 26 } | |
| 27 | |
| 28 static void | |
| 29 intern_strings(PyObject *tuple) | |
| 30 { | |
|
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parents:
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31 Py_ssize_t i; |
| 35742 | 32 |
| 33 for (i = PyTuple_GET_SIZE(tuple); --i >= 0; ) { | |
| 34 PyObject *v = PyTuple_GET_ITEM(tuple, i); | |
|
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parents:
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diff
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35 if (v == NULL || !PyBytes_CheckExact(v)) { |
| 35742 | 36 Py_FatalError("non-string found in code slot"); |
| 37 } | |
|
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38 PyBytes_InternInPlace(&PyTuple_GET_ITEM(tuple, i)); |
| 35742 | 39 } |
| 40 } | |
| 41 | |
| 42 | |
| 43 PyCodeObject * | |
| 44 PyCode_New(int argcount, int nlocals, int stacksize, int flags, | |
| 45 PyObject *code, PyObject *consts, PyObject *names, | |
| 46 PyObject *varnames, PyObject *freevars, PyObject *cellvars, | |
| 47 PyObject *filename, PyObject *name, int firstlineno, | |
| 48 PyObject *lnotab) | |
| 49 { | |
| 50 PyCodeObject *co; | |
|
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parents:
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51 Py_ssize_t i; |
| 35742 | 52 /* Check argument types */ |
| 53 if (argcount < 0 || nlocals < 0 || | |
| 54 code == NULL || | |
| 55 consts == NULL || !PyTuple_Check(consts) || | |
| 56 names == NULL || !PyTuple_Check(names) || | |
| 57 varnames == NULL || !PyTuple_Check(varnames) || | |
| 58 freevars == NULL || !PyTuple_Check(freevars) || | |
| 59 cellvars == NULL || !PyTuple_Check(cellvars) || | |
|
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60 name == NULL || !PyBytes_Check(name) || |
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61 filename == NULL || !PyBytes_Check(filename) || |
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62 lnotab == NULL || !PyBytes_Check(lnotab) || |
| 35742 | 63 !PyObject_CheckReadBuffer(code)) { |
| 64 PyErr_BadInternalCall(); | |
| 65 return NULL; | |
| 66 } | |
| 67 intern_strings(names); | |
| 68 intern_strings(varnames); | |
| 69 intern_strings(freevars); | |
| 70 intern_strings(cellvars); | |
| 71 /* Intern selected string constants */ | |
| 72 for (i = PyTuple_Size(consts); --i >= 0; ) { | |
| 73 PyObject *v = PyTuple_GetItem(consts, i); | |
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74 if (!PyBytes_Check(v)) |
| 35742 | 75 continue; |
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76 if (!all_name_chars((unsigned char *)PyBytes_AS_STRING(v))) |
| 35742 | 77 continue; |
|
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78 PyBytes_InternInPlace(&PyTuple_GET_ITEM(consts, i)); |
| 35742 | 79 } |
| 80 co = PyObject_NEW(PyCodeObject, &PyCode_Type); | |
| 81 if (co != NULL) { | |
| 82 co->co_argcount = argcount; | |
| 83 co->co_nlocals = nlocals; | |
| 84 co->co_stacksize = stacksize; | |
| 85 co->co_flags = flags; | |
| 86 Py_INCREF(code); | |
| 87 co->co_code = code; | |
| 88 Py_INCREF(consts); | |
| 89 co->co_consts = consts; | |
| 90 Py_INCREF(names); | |
| 91 co->co_names = names; | |
| 92 Py_INCREF(varnames); | |
| 93 co->co_varnames = varnames; | |
| 94 Py_INCREF(freevars); | |
| 95 co->co_freevars = freevars; | |
| 96 Py_INCREF(cellvars); | |
| 97 co->co_cellvars = cellvars; | |
| 98 Py_INCREF(filename); | |
| 99 co->co_filename = filename; | |
| 100 Py_INCREF(name); | |
| 101 co->co_name = name; | |
| 102 co->co_firstlineno = firstlineno; | |
| 103 Py_INCREF(lnotab); | |
| 104 co->co_lnotab = lnotab; | |
|
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105 co->co_zombieframe = NULL; |
| 35742 | 106 } |
| 107 return co; | |
| 108 } | |
| 109 | |
| 110 | |
| 111 #define OFF(x) offsetof(PyCodeObject, x) | |
| 112 | |
| 113 static PyMemberDef code_memberlist[] = { | |
| 114 {"co_argcount", T_INT, OFF(co_argcount), READONLY}, | |
| 115 {"co_nlocals", T_INT, OFF(co_nlocals), READONLY}, | |
| 116 {"co_stacksize",T_INT, OFF(co_stacksize), READONLY}, | |
| 117 {"co_flags", T_INT, OFF(co_flags), READONLY}, | |
| 118 {"co_code", T_OBJECT, OFF(co_code), READONLY}, | |
| 119 {"co_consts", T_OBJECT, OFF(co_consts), READONLY}, | |
| 120 {"co_names", T_OBJECT, OFF(co_names), READONLY}, | |
| 121 {"co_varnames", T_OBJECT, OFF(co_varnames), READONLY}, | |
| 122 {"co_freevars", T_OBJECT, OFF(co_freevars), READONLY}, | |
| 123 {"co_cellvars", T_OBJECT, OFF(co_cellvars), READONLY}, | |
| 124 {"co_filename", T_OBJECT, OFF(co_filename), READONLY}, | |
| 125 {"co_name", T_OBJECT, OFF(co_name), READONLY}, | |
| 126 {"co_firstlineno", T_INT, OFF(co_firstlineno), READONLY}, | |
| 127 {"co_lnotab", T_OBJECT, OFF(co_lnotab), READONLY}, | |
| 128 {NULL} /* Sentinel */ | |
| 129 }; | |
| 130 | |
| 131 /* Helper for code_new: return a shallow copy of a tuple that is | |
| 132 guaranteed to contain exact strings, by converting string subclasses | |
| 133 to exact strings and complaining if a non-string is found. */ | |
| 134 static PyObject* | |
| 135 validate_and_copy_tuple(PyObject *tup) | |
| 136 { | |
| 137 PyObject *newtuple; | |
| 138 PyObject *item; | |
|
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Merge ssize_t branch.
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parents:
35742
diff
changeset
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139 Py_ssize_t i, len; |
| 35742 | 140 |
| 141 len = PyTuple_GET_SIZE(tup); | |
| 142 newtuple = PyTuple_New(len); | |
| 143 if (newtuple == NULL) | |
| 144 return NULL; | |
| 145 | |
| 146 for (i = 0; i < len; i++) { | |
| 147 item = PyTuple_GET_ITEM(tup, i); | |
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148 if (PyBytes_CheckExact(item)) { |
| 35742 | 149 Py_INCREF(item); |
| 150 } | |
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151 else if (!PyBytes_Check(item)) { |
| 35742 | 152 PyErr_Format( |
| 153 PyExc_TypeError, | |
| 154 "name tuples must contain only " | |
| 155 "strings, not '%.500s'", | |
| 156 item->ob_type->tp_name); | |
| 157 Py_DECREF(newtuple); | |
| 158 return NULL; | |
| 159 } | |
| 160 else { | |
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161 item = PyBytes_FromStringAndSize( |
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162 PyBytes_AS_STRING(item), |
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163 PyBytes_GET_SIZE(item)); |
| 35742 | 164 if (item == NULL) { |
| 165 Py_DECREF(newtuple); | |
| 166 return NULL; | |
| 167 } | |
| 168 } | |
| 169 PyTuple_SET_ITEM(newtuple, i, item); | |
| 170 } | |
| 171 | |
| 172 return newtuple; | |
| 173 } | |
| 174 | |
| 175 PyDoc_STRVAR(code_doc, | |
| 176 "code(argcount, nlocals, stacksize, flags, codestring, constants, names,\n\ | |
| 177 varnames, filename, name, firstlineno, lnotab[, freevars[, cellvars]])\n\ | |
| 178 \n\ | |
| 179 Create a code object. Not for the faint of heart."); | |
| 180 | |
| 181 static PyObject * | |
| 182 code_new(PyTypeObject *type, PyObject *args, PyObject *kw) | |
| 183 { | |
| 184 int argcount; | |
| 185 int nlocals; | |
| 186 int stacksize; | |
| 187 int flags; | |
| 188 PyObject *co = NULL; | |
| 189 PyObject *code; | |
| 190 PyObject *consts; | |
| 191 PyObject *names, *ournames = NULL; | |
| 192 PyObject *varnames, *ourvarnames = NULL; | |
| 193 PyObject *freevars = NULL, *ourfreevars = NULL; | |
| 194 PyObject *cellvars = NULL, *ourcellvars = NULL; | |
| 195 PyObject *filename; | |
| 196 PyObject *name; | |
| 197 int firstlineno; | |
| 198 PyObject *lnotab; | |
| 199 | |
| 200 if (!PyArg_ParseTuple(args, "iiiiSO!O!O!SSiS|O!O!:code", | |
| 201 &argcount, &nlocals, &stacksize, &flags, | |
| 202 &code, | |
| 203 &PyTuple_Type, &consts, | |
| 204 &PyTuple_Type, &names, | |
| 205 &PyTuple_Type, &varnames, | |
| 206 &filename, &name, | |
| 207 &firstlineno, &lnotab, | |
| 208 &PyTuple_Type, &freevars, | |
| 209 &PyTuple_Type, &cellvars)) | |
| 210 return NULL; | |
| 211 | |
| 212 if (argcount < 0) { | |
| 213 PyErr_SetString( | |
| 214 PyExc_ValueError, | |
| 215 "code: argcount must not be negative"); | |
| 216 goto cleanup; | |
| 217 } | |
| 218 | |
| 219 if (nlocals < 0) { | |
| 220 PyErr_SetString( | |
| 221 PyExc_ValueError, | |
| 222 "code: nlocals must not be negative"); | |
| 223 goto cleanup; | |
| 224 } | |
| 225 | |
| 226 ournames = validate_and_copy_tuple(names); | |
| 227 if (ournames == NULL) | |
| 228 goto cleanup; | |
| 229 ourvarnames = validate_and_copy_tuple(varnames); | |
| 230 if (ourvarnames == NULL) | |
| 231 goto cleanup; | |
| 232 if (freevars) | |
| 233 ourfreevars = validate_and_copy_tuple(freevars); | |
| 234 else | |
| 235 ourfreevars = PyTuple_New(0); | |
| 236 if (ourfreevars == NULL) | |
| 237 goto cleanup; | |
| 238 if (cellvars) | |
| 239 ourcellvars = validate_and_copy_tuple(cellvars); | |
| 240 else | |
| 241 ourcellvars = PyTuple_New(0); | |
| 242 if (ourcellvars == NULL) | |
| 243 goto cleanup; | |
| 244 | |
| 245 co = (PyObject *)PyCode_New(argcount, nlocals, stacksize, flags, | |
| 246 code, consts, ournames, ourvarnames, | |
| 247 ourfreevars, ourcellvars, filename, | |
| 248 name, firstlineno, lnotab); | |
| 249 cleanup: | |
| 250 Py_XDECREF(ournames); | |
| 251 Py_XDECREF(ourvarnames); | |
| 252 Py_XDECREF(ourfreevars); | |
| 253 Py_XDECREF(ourcellvars); | |
| 254 return co; | |
| 255 } | |
| 256 | |
| 257 static void | |
| 258 code_dealloc(PyCodeObject *co) | |
| 259 { | |
| 260 Py_XDECREF(co->co_code); | |
| 261 Py_XDECREF(co->co_consts); | |
| 262 Py_XDECREF(co->co_names); | |
| 263 Py_XDECREF(co->co_varnames); | |
| 264 Py_XDECREF(co->co_freevars); | |
| 265 Py_XDECREF(co->co_cellvars); | |
| 266 Py_XDECREF(co->co_filename); | |
| 267 Py_XDECREF(co->co_name); | |
| 268 Py_XDECREF(co->co_lnotab); | |
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Merge from rjones-funccall branch.
Richard Jones <richard@commonground.com.au>
parents:
37838
diff
changeset
|
269 if (co->co_zombieframe != NULL) |
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parents:
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diff
changeset
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270 PyObject_GC_Del(co->co_zombieframe); |
| 35742 | 271 PyObject_DEL(co); |
| 272 } | |
| 273 | |
| 274 static PyObject * | |
| 275 code_repr(PyCodeObject *co) | |
| 276 { | |
| 277 char buf[500]; | |
| 278 int lineno = -1; | |
| 279 char *filename = "???"; | |
| 280 char *name = "???"; | |
| 281 | |
| 282 if (co->co_firstlineno != 0) | |
| 283 lineno = co->co_firstlineno; | |
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284 if (co->co_filename && PyBytes_Check(co->co_filename)) |
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285 filename = PyBytes_AS_STRING(co->co_filename); |
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286 if (co->co_name && PyBytes_Check(co->co_name)) |
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287 name = PyBytes_AS_STRING(co->co_name); |
| 35742 | 288 PyOS_snprintf(buf, sizeof(buf), |
| 289 "<code object %.100s at %p, file \"%.300s\", line %d>", | |
| 290 name, co, filename, lineno); | |
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291 return PyBytes_FromString(buf); |
| 35742 | 292 } |
| 293 | |
| 294 static int | |
| 295 code_compare(PyCodeObject *co, PyCodeObject *cp) | |
| 296 { | |
| 297 int cmp; | |
| 298 cmp = PyObject_Compare(co->co_name, cp->co_name); | |
| 299 if (cmp) return cmp; | |
| 300 cmp = co->co_argcount - cp->co_argcount; | |
| 301 if (cmp) goto normalize; | |
| 302 cmp = co->co_nlocals - cp->co_nlocals; | |
| 303 if (cmp) goto normalize; | |
| 304 cmp = co->co_flags - cp->co_flags; | |
| 305 if (cmp) goto normalize; | |
| 306 cmp = co->co_firstlineno - cp->co_firstlineno; | |
| 307 if (cmp) goto normalize; | |
| 308 cmp = PyObject_Compare(co->co_code, cp->co_code); | |
| 309 if (cmp) return cmp; | |
| 310 cmp = PyObject_Compare(co->co_consts, cp->co_consts); | |
| 311 if (cmp) return cmp; | |
| 312 cmp = PyObject_Compare(co->co_names, cp->co_names); | |
| 313 if (cmp) return cmp; | |
| 314 cmp = PyObject_Compare(co->co_varnames, cp->co_varnames); | |
| 315 if (cmp) return cmp; | |
| 316 cmp = PyObject_Compare(co->co_freevars, cp->co_freevars); | |
| 317 if (cmp) return cmp; | |
| 318 cmp = PyObject_Compare(co->co_cellvars, cp->co_cellvars); | |
| 319 return cmp; | |
| 320 | |
| 321 normalize: | |
| 322 if (cmp > 0) | |
| 323 return 1; | |
| 324 else if (cmp < 0) | |
| 325 return -1; | |
| 326 else | |
| 327 return 0; | |
| 328 } | |
| 329 | |
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860e23a61e55
Add py3k warnings for code and method inequality comparisons. This should resolve issue 2373. The codeobject.c and methodobject.c changes are both just backports of the Python 3 code.
Steven Bethard <steven.bethard@gmail.com>
parents:
42333
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changeset
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330 static PyObject * |
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860e23a61e55
Add py3k warnings for code and method inequality comparisons. This should resolve issue 2373. The codeobject.c and methodobject.c changes are both just backports of the Python 3 code.
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parents:
42333
diff
changeset
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331 code_richcompare(PyObject *self, PyObject *other, int op) |
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860e23a61e55
Add py3k warnings for code and method inequality comparisons. This should resolve issue 2373. The codeobject.c and methodobject.c changes are both just backports of the Python 3 code.
Steven Bethard <steven.bethard@gmail.com>
parents:
42333
diff
changeset
|
332 { |
|
860e23a61e55
Add py3k warnings for code and method inequality comparisons. This should resolve issue 2373. The codeobject.c and methodobject.c changes are both just backports of the Python 3 code.
Steven Bethard <steven.bethard@gmail.com>
parents:
42333
diff
changeset
|
333 PyCodeObject *co, *cp; |
|
860e23a61e55
Add py3k warnings for code and method inequality comparisons. This should resolve issue 2373. The codeobject.c and methodobject.c changes are both just backports of the Python 3 code.
Steven Bethard <steven.bethard@gmail.com>
parents:
42333
diff
changeset
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334 int eq; |
|
860e23a61e55
Add py3k warnings for code and method inequality comparisons. This should resolve issue 2373. The codeobject.c and methodobject.c changes are both just backports of the Python 3 code.
Steven Bethard <steven.bethard@gmail.com>
parents:
42333
diff
changeset
|
335 PyObject *res; |
|
860e23a61e55
Add py3k warnings for code and method inequality comparisons. This should resolve issue 2373. The codeobject.c and methodobject.c changes are both just backports of the Python 3 code.
Steven Bethard <steven.bethard@gmail.com>
parents:
42333
diff
changeset
|
336 |
|
860e23a61e55
Add py3k warnings for code and method inequality comparisons. This should resolve issue 2373. The codeobject.c and methodobject.c changes are both just backports of the Python 3 code.
Steven Bethard <steven.bethard@gmail.com>
parents:
42333
diff
changeset
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337 if ((op != Py_EQ && op != Py_NE) || |
|
860e23a61e55
Add py3k warnings for code and method inequality comparisons. This should resolve issue 2373. The codeobject.c and methodobject.c changes are both just backports of the Python 3 code.
Steven Bethard <steven.bethard@gmail.com>
parents:
42333
diff
changeset
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338 !PyCode_Check(self) || |
|
860e23a61e55
Add py3k warnings for code and method inequality comparisons. This should resolve issue 2373. The codeobject.c and methodobject.c changes are both just backports of the Python 3 code.
Steven Bethard <steven.bethard@gmail.com>
parents:
42333
diff
changeset
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339 !PyCode_Check(other)) { |
|
860e23a61e55
Add py3k warnings for code and method inequality comparisons. This should resolve issue 2373. The codeobject.c and methodobject.c changes are both just backports of the Python 3 code.
Steven Bethard <steven.bethard@gmail.com>
parents:
42333
diff
changeset
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340 |
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Make Py3k warnings consistent w.r.t. punctuation; also respect the
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341 /* Py3K warning if types are not equal and comparison |
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342 isn't == or != */ |
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Use PyErr_WarnPy3k throughout
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343 if (PyErr_WarnPy3k("code inequality comparisons not supported " |
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344 "in 3.x", 1) < 0) { |
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45885
860e23a61e55
Add py3k warnings for code and method inequality comparisons. This should resolve issue 2373. The codeobject.c and methodobject.c changes are both just backports of the Python 3 code.
Steven Bethard <steven.bethard@gmail.com>
parents:
42333
diff
changeset
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345 return NULL; |
|
860e23a61e55
Add py3k warnings for code and method inequality comparisons. This should resolve issue 2373. The codeobject.c and methodobject.c changes are both just backports of the Python 3 code.
Steven Bethard <steven.bethard@gmail.com>
parents:
42333
diff
changeset
|
346 } |
|
860e23a61e55
Add py3k warnings for code and method inequality comparisons. This should resolve issue 2373. The codeobject.c and methodobject.c changes are both just backports of the Python 3 code.
Steven Bethard <steven.bethard@gmail.com>
parents:
42333
diff
changeset
|
347 |
|
860e23a61e55
Add py3k warnings for code and method inequality comparisons. This should resolve issue 2373. The codeobject.c and methodobject.c changes are both just backports of the Python 3 code.
Steven Bethard <steven.bethard@gmail.com>
parents:
42333
diff
changeset
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348 Py_INCREF(Py_NotImplemented); |
|
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Add py3k warnings for code and method inequality comparisons. This should resolve issue 2373. The codeobject.c and methodobject.c changes are both just backports of the Python 3 code.
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349 return Py_NotImplemented; |
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350 } |
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351 |
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352 co = (PyCodeObject *)self; |
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353 cp = (PyCodeObject *)other; |
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354 |
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355 eq = PyObject_RichCompareBool(co->co_name, cp->co_name, Py_EQ); |
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356 if (eq <= 0) goto unequal; |
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357 eq = co->co_argcount == cp->co_argcount; |
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358 if (!eq) goto unequal; |
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359 eq = co->co_nlocals == cp->co_nlocals; |
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360 if (!eq) goto unequal; |
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361 eq = co->co_flags == cp->co_flags; |
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362 if (!eq) goto unequal; |
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363 eq = co->co_firstlineno == cp->co_firstlineno; |
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364 if (!eq) goto unequal; |
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365 eq = PyObject_RichCompareBool(co->co_code, cp->co_code, Py_EQ); |
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366 if (eq <= 0) goto unequal; |
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367 eq = PyObject_RichCompareBool(co->co_consts, cp->co_consts, Py_EQ); |
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368 if (eq <= 0) goto unequal; |
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369 eq = PyObject_RichCompareBool(co->co_names, cp->co_names, Py_EQ); |
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370 if (eq <= 0) goto unequal; |
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371 eq = PyObject_RichCompareBool(co->co_varnames, cp->co_varnames, Py_EQ); |
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372 if (eq <= 0) goto unequal; |
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373 eq = PyObject_RichCompareBool(co->co_freevars, cp->co_freevars, Py_EQ); |
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374 if (eq <= 0) goto unequal; |
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375 eq = PyObject_RichCompareBool(co->co_cellvars, cp->co_cellvars, Py_EQ); |
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376 if (eq <= 0) goto unequal; |
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377 |
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378 if (op == Py_EQ) |
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379 res = Py_True; |
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380 else |
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381 res = Py_False; |
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382 goto done; |
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383 |
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384 unequal: |
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385 if (eq < 0) |
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386 return NULL; |
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387 if (op == Py_NE) |
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388 res = Py_True; |
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389 else |
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390 res = Py_False; |
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391 |
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392 done: |
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393 Py_INCREF(res); |
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394 return res; |
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395 } |
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396 |
| 35742 | 397 static long |
| 398 code_hash(PyCodeObject *co) | |
| 399 { | |
| 400 long h, h0, h1, h2, h3, h4, h5, h6; | |
| 401 h0 = PyObject_Hash(co->co_name); | |
| 402 if (h0 == -1) return -1; | |
| 403 h1 = PyObject_Hash(co->co_code); | |
| 404 if (h1 == -1) return -1; | |
| 405 h2 = PyObject_Hash(co->co_consts); | |
| 406 if (h2 == -1) return -1; | |
| 407 h3 = PyObject_Hash(co->co_names); | |
| 408 if (h3 == -1) return -1; | |
| 409 h4 = PyObject_Hash(co->co_varnames); | |
| 410 if (h4 == -1) return -1; | |
| 411 h5 = PyObject_Hash(co->co_freevars); | |
| 412 if (h5 == -1) return -1; | |
| 413 h6 = PyObject_Hash(co->co_cellvars); | |
| 414 if (h6 == -1) return -1; | |
| 415 h = h0 ^ h1 ^ h2 ^ h3 ^ h4 ^ h5 ^ h6 ^ | |
| 416 co->co_argcount ^ co->co_nlocals ^ co->co_flags; | |
| 417 if (h == -1) h = -2; | |
| 418 return h; | |
| 419 } | |
| 420 | |
| 421 /* XXX code objects need to participate in GC? */ | |
| 422 | |
| 423 PyTypeObject PyCode_Type = { | |
|
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424 PyVarObject_HEAD_INIT(&PyType_Type, 0) |
| 35742 | 425 "code", |
| 426 sizeof(PyCodeObject), | |
| 427 0, | |
| 428 (destructor)code_dealloc, /* tp_dealloc */ | |
| 429 0, /* tp_print */ | |
| 430 0, /* tp_getattr */ | |
| 431 0, /* tp_setattr */ | |
| 432 (cmpfunc)code_compare, /* tp_compare */ | |
| 433 (reprfunc)code_repr, /* tp_repr */ | |
| 434 0, /* tp_as_number */ | |
| 435 0, /* tp_as_sequence */ | |
| 436 0, /* tp_as_mapping */ | |
| 437 (hashfunc)code_hash, /* tp_hash */ | |
| 438 0, /* tp_call */ | |
| 439 0, /* tp_str */ | |
| 440 PyObject_GenericGetAttr, /* tp_getattro */ | |
| 441 0, /* tp_setattro */ | |
| 442 0, /* tp_as_buffer */ | |
| 443 Py_TPFLAGS_DEFAULT, /* tp_flags */ | |
| 444 code_doc, /* tp_doc */ | |
| 445 0, /* tp_traverse */ | |
| 446 0, /* tp_clear */ | |
|
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447 code_richcompare, /* tp_richcompare */ |
| 35742 | 448 0, /* tp_weaklistoffset */ |
| 449 0, /* tp_iter */ | |
| 450 0, /* tp_iternext */ | |
| 451 0, /* tp_methods */ | |
| 452 code_memberlist, /* tp_members */ | |
| 453 0, /* tp_getset */ | |
| 454 0, /* tp_base */ | |
| 455 0, /* tp_dict */ | |
| 456 0, /* tp_descr_get */ | |
| 457 0, /* tp_descr_set */ | |
| 458 0, /* tp_dictoffset */ | |
| 459 0, /* tp_init */ | |
| 460 0, /* tp_alloc */ | |
| 461 code_new, /* tp_new */ | |
| 462 }; | |
| 463 | |
| 464 /* All about c_lnotab. | |
| 465 | |
| 466 c_lnotab is an array of unsigned bytes disguised as a Python string. In -O | |
| 467 mode, SET_LINENO opcodes aren't generated, and bytecode offsets are mapped | |
| 468 to source code line #s (when needed for tracebacks) via c_lnotab instead. | |
| 469 The array is conceptually a list of | |
| 470 (bytecode offset increment, line number increment) | |
| 471 pairs. The details are important and delicate, best illustrated by example: | |
| 472 | |
| 473 byte code offset source code line number | |
| 474 0 1 | |
| 475 6 2 | |
| 476 50 7 | |
| 477 350 307 | |
| 478 361 308 | |
| 479 | |
| 480 The first trick is that these numbers aren't stored, only the increments | |
| 481 from one row to the next (this doesn't really work, but it's a start): | |
| 482 | |
| 483 0, 1, 6, 1, 44, 5, 300, 300, 11, 1 | |
| 484 | |
| 485 The second trick is that an unsigned byte can't hold negative values, or | |
| 486 values larger than 255, so (a) there's a deep assumption that byte code | |
| 487 offsets and their corresponding line #s both increase monotonically, and (b) | |
| 488 if at least one column jumps by more than 255 from one row to the next, more | |
| 489 than one pair is written to the table. In case #b, there's no way to know | |
| 490 from looking at the table later how many were written. That's the delicate | |
| 491 part. A user of c_lnotab desiring to find the source line number | |
| 492 corresponding to a bytecode address A should do something like this | |
| 493 | |
| 494 lineno = addr = 0 | |
| 495 for addr_incr, line_incr in c_lnotab: | |
| 496 addr += addr_incr | |
| 497 if addr > A: | |
| 498 return lineno | |
| 499 lineno += line_incr | |
| 500 | |
| 501 In order for this to work, when the addr field increments by more than 255, | |
| 502 the line # increment in each pair generated must be 0 until the remaining addr | |
| 503 increment is < 256. So, in the example above, com_set_lineno should not (as | |
| 504 was actually done until 2.2) expand 300, 300 to 255, 255, 45, 45, but to | |
| 505 255, 0, 45, 255, 0, 45. | |
| 506 */ | |
| 507 | |
| 508 int | |
| 509 PyCode_Addr2Line(PyCodeObject *co, int addrq) | |
| 510 { | |
|
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511 int size = PyBytes_Size(co->co_lnotab) / 2; |
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512 unsigned char *p = (unsigned char*)PyBytes_AsString(co->co_lnotab); |
| 35742 | 513 int line = co->co_firstlineno; |
| 514 int addr = 0; | |
| 515 while (--size >= 0) { | |
| 516 addr += *p++; | |
| 517 if (addr > addrq) | |
| 518 break; | |
| 519 line += *p++; | |
| 520 } | |
| 521 return line; | |
| 522 } | |
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523 |
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524 /* |
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525 Check whether the current instruction is at the start of a line. |
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526 |
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527 */ |
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528 |
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529 /* The theory of SET_LINENO-less tracing. |
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530 |
|
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531 In a nutshell, we use the co_lnotab field of the code object |
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532 to tell when execution has moved onto a different line. |
|
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533 |
|
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534 As mentioned above, the basic idea is so set things up so |
|
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535 that |
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536 |
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537 *instr_lb <= frame->f_lasti < *instr_ub |
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538 |
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539 is true so long as execution does not change lines. |
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540 |
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541 This is all fairly simple. Digging the information out of |
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542 co_lnotab takes some work, but is conceptually clear. |
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543 |
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544 Somewhat harder to explain is why we don't *always* call the |
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545 line trace function when the above test fails. |
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546 |
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547 Consider this code: |
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548 |
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549 1: def f(a): |
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550 2: if a: |
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551 3: print 1 |
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552 4: else: |
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553 5: print 2 |
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554 |
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555 which compiles to this: |
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556 |
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557 2 0 LOAD_FAST 0 (a) |
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558 3 JUMP_IF_FALSE 9 (to 15) |
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559 6 POP_TOP |
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560 |
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561 3 7 LOAD_CONST 1 (1) |
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562 10 PRINT_ITEM |
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563 11 PRINT_NEWLINE |
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564 12 JUMP_FORWARD 6 (to 21) |
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565 >> 15 POP_TOP |
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566 |
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567 5 16 LOAD_CONST 2 (2) |
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568 19 PRINT_ITEM |
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569 20 PRINT_NEWLINE |
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570 >> 21 LOAD_CONST 0 (None) |
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571 24 RETURN_VALUE |
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572 |
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573 If 'a' is false, execution will jump to instruction at offset |
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574 15 and the co_lnotab will claim that execution has moved to |
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575 line 3. This is at best misleading. In this case we could |
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576 associate the POP_TOP with line 4, but that doesn't make |
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577 sense in all cases (I think). |
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578 |
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579 What we do is only call the line trace function if the co_lnotab |
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580 indicates we have jumped to the *start* of a line, i.e. if the |
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581 current instruction offset matches the offset given for the |
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582 start of a line by the co_lnotab. |
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583 |
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584 This also takes care of the situation where 'a' is true. |
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585 Execution will jump from instruction offset 12 to offset 21. |
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586 Then the co_lnotab would imply that execution has moved to line |
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587 5, which is again misleading. |
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588 |
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589 Why do we set f_lineno when tracing? Well, consider the code |
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590 above when 'a' is true. If stepping through this with 'n' in |
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591 pdb, you would stop at line 1 with a "call" type event, then |
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592 line events on lines 2 and 3, then a "return" type event -- but |
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593 you would be shown line 5 during this event. This is a change |
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594 from the behaviour in 2.2 and before, and I've found it |
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595 confusing in practice. By setting and using f_lineno when |
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596 tracing, one can report a line number different from that |
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597 suggested by f_lasti on this one occasion where it's desirable. |
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598 */ |
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599 |
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600 |
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601 int |
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602 PyCode_CheckLineNumber(PyCodeObject* co, int lasti, PyAddrPair *bounds) |
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603 { |
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604 int size, addr, line; |
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605 unsigned char* p; |
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606 |
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607 p = (unsigned char*)PyBytes_AS_STRING(co->co_lnotab); |
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608 size = PyBytes_GET_SIZE(co->co_lnotab) / 2; |
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609 |
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610 addr = 0; |
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611 line = co->co_firstlineno; |
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612 assert(line > 0); |
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613 |
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614 /* possible optimization: if f->f_lasti == instr_ub |
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615 (likely to be a common case) then we already know |
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616 instr_lb -- if we stored the matching value of p |
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617 somwhere we could skip the first while loop. */ |
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618 |
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619 /* see comments in compile.c for the description of |
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620 co_lnotab. A point to remember: increments to p |
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621 should come in pairs -- although we don't care about |
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622 the line increments here, treating them as byte |
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623 increments gets confusing, to say the least. */ |
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624 |
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Fix uninitialized memory read reported by Valgrind when running doctest.
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625 bounds->ap_lower = 0; |
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626 while (size > 0) { |
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627 if (addr + *p > lasti) |
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628 break; |
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629 addr += *p++; |
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630 if (*p) |
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631 bounds->ap_lower = addr; |
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632 line += *p++; |
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633 --size; |
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634 } |
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635 |
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636 /* If lasti and addr don't match exactly, we don't want to |
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Jeremy Hylton <jeremy@alum.mit.edu>
parents:
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637 change the lineno slot on the frame or execute a trace |
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cc48985c3266
Refactor: Move code that uses co_lnotab from ceval to codeobject
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
36501
diff
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638 function. Return -1 instead. |
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cc48985c3266
Refactor: Move code that uses co_lnotab from ceval to codeobject
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
36501
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639 */ |
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cc48985c3266
Refactor: Move code that uses co_lnotab from ceval to codeobject
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
36501
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640 if (addr != lasti) |
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cc48985c3266
Refactor: Move code that uses co_lnotab from ceval to codeobject
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
36501
diff
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641 line = -1; |
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cc48985c3266
Refactor: Move code that uses co_lnotab from ceval to codeobject
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
36501
diff
changeset
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642 |
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cc48985c3266
Refactor: Move code that uses co_lnotab from ceval to codeobject
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
36501
diff
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643 if (size > 0) { |
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cc48985c3266
Refactor: Move code that uses co_lnotab from ceval to codeobject
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
36501
diff
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644 while (--size >= 0) { |
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cc48985c3266
Refactor: Move code that uses co_lnotab from ceval to codeobject
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
36501
diff
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645 addr += *p++; |
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cc48985c3266
Refactor: Move code that uses co_lnotab from ceval to codeobject
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
36501
diff
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646 if (*p++) |
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cc48985c3266
Refactor: Move code that uses co_lnotab from ceval to codeobject
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
36501
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647 break; |
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cc48985c3266
Refactor: Move code that uses co_lnotab from ceval to codeobject
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
36501
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648 } |
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cc48985c3266
Refactor: Move code that uses co_lnotab from ceval to codeobject
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
36501
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649 bounds->ap_upper = addr; |
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cc48985c3266
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Jeremy Hylton <jeremy@alum.mit.edu>
parents:
36501
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650 } |
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cc48985c3266
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Jeremy Hylton <jeremy@alum.mit.edu>
parents:
36501
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651 else { |
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cc48985c3266
Refactor: Move code that uses co_lnotab from ceval to codeobject
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
36501
diff
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652 bounds->ap_upper = INT_MAX; |
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cc48985c3266
Refactor: Move code that uses co_lnotab from ceval to codeobject
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
36501
diff
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653 } |
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cc48985c3266
Refactor: Move code that uses co_lnotab from ceval to codeobject
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
36501
diff
changeset
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654 |
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cc48985c3266
Refactor: Move code that uses co_lnotab from ceval to codeobject
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
36501
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655 return line; |
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cc48985c3266
Refactor: Move code that uses co_lnotab from ceval to codeobject
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
36501
diff
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656 } |