Mercurial > cpython-lru_cache-weakref

annotate Objects/codeobject.c @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents b36cb4602e21
children
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rev   line source
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1 #include "Python.h"
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2 #include "code.h"
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3 #include "structmember.h"
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4
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5 #define NAME_CHARS \
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6 "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz"
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7
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8 /* all_name_chars(s): true iff all chars in s are valid NAME_CHARS */
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9
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10 static int
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11 all_name_chars(unsigned char *s)
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12 {
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13 static char ok_name_char[256];
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14 static unsigned char *name_chars = (unsigned char *)NAME_CHARS;
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15
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16 if (ok_name_char[*name_chars] == 0) {
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17 unsigned char *p;
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18 for (p = name_chars; *p; p++)
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19 ok_name_char[*p] = 1;
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20 }
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21 while (*s) {
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22 if (ok_name_char[*s++] == 0)
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23 return 0;
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24 }
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25 return 1;
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26 }
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27
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28 static void
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29 intern_strings(PyObject *tuple)
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30 {
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31 Py_ssize_t i;
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32
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33 for (i = PyTuple_GET_SIZE(tuple); --i >= 0; ) {
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34 PyObject *v = PyTuple_GET_ITEM(tuple, i);
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35 if (v == NULL || !PyString_CheckExact(v)) {
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36 Py_FatalError("non-string found in code slot");
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37 }
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38 PyString_InternInPlace(&PyTuple_GET_ITEM(tuple, i));
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39 }
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40 }
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41
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42
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43 PyCodeObject *
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44 PyCode_New(int argcount, int nlocals, int stacksize, int flags,
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45 PyObject *code, PyObject *consts, PyObject *names,
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46 PyObject *varnames, PyObject *freevars, PyObject *cellvars,
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47 PyObject *filename, PyObject *name, int firstlineno,
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48 PyObject *lnotab)
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49 {
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50 PyCodeObject *co;
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51 Py_ssize_t i;
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52 /* Check argument types */
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53 if (argcount < 0 || nlocals < 0 ||
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54 code == NULL ||
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55 consts == NULL || !PyTuple_Check(consts) ||
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56 names == NULL || !PyTuple_Check(names) ||
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57 varnames == NULL || !PyTuple_Check(varnames) ||
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58 freevars == NULL || !PyTuple_Check(freevars) ||
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59 cellvars == NULL || !PyTuple_Check(cellvars) ||
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60 name == NULL || !PyString_Check(name) ||
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61 filename == NULL || !PyString_Check(filename) ||
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62 lnotab == NULL || !PyString_Check(lnotab) ||
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63 !PyObject_CheckReadBuffer(code)) {
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64 PyErr_BadInternalCall();
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65 return NULL;
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66 }
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67 intern_strings(names);
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68 intern_strings(varnames);
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69 intern_strings(freevars);
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70 intern_strings(cellvars);
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71 /* Intern selected string constants */
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72 for (i = PyTuple_Size(consts); --i >= 0; ) {
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73 PyObject *v = PyTuple_GetItem(consts, i);
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74 if (!PyString_Check(v))
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75 continue;
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76 if (!all_name_chars((unsigned char *)PyString_AS_STRING(v)))
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77 continue;
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78 PyString_InternInPlace(&PyTuple_GET_ITEM(consts, i));
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79 }
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80 co = PyObject_NEW(PyCodeObject, &PyCode_Type);
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81 if (co != NULL) {
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82 co->co_argcount = argcount;
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83 co->co_nlocals = nlocals;
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84 co->co_stacksize = stacksize;
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85 co->co_flags = flags;
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86 Py_INCREF(code);
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87 co->co_code = code;
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88 Py_INCREF(consts);
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89 co->co_consts = consts;
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90 Py_INCREF(names);
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91 co->co_names = names;
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92 Py_INCREF(varnames);
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93 co->co_varnames = varnames;
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94 Py_INCREF(freevars);
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95 co->co_freevars = freevars;
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96 Py_INCREF(cellvars);
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97 co->co_cellvars = cellvars;
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98 Py_INCREF(filename);
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99 co->co_filename = filename;
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100 Py_INCREF(name);
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101 co->co_name = name;
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102 co->co_firstlineno = firstlineno;
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103 Py_INCREF(lnotab);
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104 co->co_lnotab = lnotab;
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105 co->co_zombieframe = NULL;
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106 co->co_weakreflist = NULL;
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107 }
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108 return co;
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109 }
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110
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111 PyCodeObject *
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112 PyCode_NewEmpty(const char *filename, const char *funcname, int firstlineno)
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113 {
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114 static PyObject *emptystring = NULL;
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115 static PyObject *nulltuple = NULL;
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116 PyObject *filename_ob = NULL;
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117 PyObject *funcname_ob = NULL;
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118 PyCodeObject *result = NULL;
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119 if (emptystring == NULL) {
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120 emptystring = PyString_FromString("");
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121 if (emptystring == NULL)
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122 goto failed;
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123 }
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124 if (nulltuple == NULL) {
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125 nulltuple = PyTuple_New(0);
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126 if (nulltuple == NULL)
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127 goto failed;
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128 }
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129 funcname_ob = PyString_FromString(funcname);
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130 if (funcname_ob == NULL)
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131 goto failed;
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132 filename_ob = PyString_FromString(filename);
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133 if (filename_ob == NULL)
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134 goto failed;
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135
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136 result = PyCode_New(0, /* argcount */
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137 0, /* nlocals */
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138 0, /* stacksize */
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139 0, /* flags */
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140 emptystring, /* code */
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141 nulltuple, /* consts */
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142 nulltuple, /* names */
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143 nulltuple, /* varnames */
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144 nulltuple, /* freevars */
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145 nulltuple, /* cellvars */
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146 filename_ob, /* filename */
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147 funcname_ob, /* name */
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148 firstlineno, /* firstlineno */
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149 emptystring /* lnotab */
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150 );
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151
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152 failed:
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153 Py_XDECREF(funcname_ob);
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154 Py_XDECREF(filename_ob);
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155 return result;
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156 }
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157
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158 #define OFF(x) offsetof(PyCodeObject, x)
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159
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160 static PyMemberDef code_memberlist[] = {
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161 {"co_argcount", T_INT, OFF(co_argcount), READONLY},
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162 {"co_nlocals", T_INT, OFF(co_nlocals), READONLY},
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163 {"co_stacksize",T_INT, OFF(co_stacksize), READONLY},
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164 {"co_flags", T_INT, OFF(co_flags), READONLY},
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165 {"co_code", T_OBJECT, OFF(co_code), READONLY},
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166 {"co_consts", T_OBJECT, OFF(co_consts), READONLY},
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167 {"co_names", T_OBJECT, OFF(co_names), READONLY},
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168 {"co_varnames", T_OBJECT, OFF(co_varnames), READONLY},
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169 {"co_freevars", T_OBJECT, OFF(co_freevars), READONLY},
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170 {"co_cellvars", T_OBJECT, OFF(co_cellvars), READONLY},
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171 {"co_filename", T_OBJECT, OFF(co_filename), READONLY},
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172 {"co_name", T_OBJECT, OFF(co_name), READONLY},
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173 {"co_firstlineno", T_INT, OFF(co_firstlineno), READONLY},
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174 {"co_lnotab", T_OBJECT, OFF(co_lnotab), READONLY},
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175 {NULL} /* Sentinel */
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176 };
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177
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178 /* Helper for code_new: return a shallow copy of a tuple that is
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179 guaranteed to contain exact strings, by converting string subclasses
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180 to exact strings and complaining if a non-string is found. */
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181 static PyObject*
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182 validate_and_copy_tuple(PyObject *tup)
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183 {
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184 PyObject *newtuple;
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185 PyObject *item;
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186 Py_ssize_t i, len;
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187
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188 len = PyTuple_GET_SIZE(tup);
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189 newtuple = PyTuple_New(len);
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190 if (newtuple == NULL)
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191 return NULL;
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192
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193 for (i = 0; i < len; i++) {
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194 item = PyTuple_GET_ITEM(tup, i);
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195 if (PyString_CheckExact(item)) {
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196 Py_INCREF(item);
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197 }
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198 else if (!PyString_Check(item)) {
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199 PyErr_Format(
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200 PyExc_TypeError,
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201 "name tuples must contain only "
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202 "strings, not '%.500s'",
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203 item->ob_type->tp_name);
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204 Py_DECREF(newtuple);
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205 return NULL;
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206 }
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207 else {
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208 item = PyString_FromStringAndSize(
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209 PyString_AS_STRING(item),
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210 PyString_GET_SIZE(item));
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211 if (item == NULL) {
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212 Py_DECREF(newtuple);
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213 return NULL;
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214 }
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215 }
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216 PyTuple_SET_ITEM(newtuple, i, item);
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217 }
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218
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219 return newtuple;
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220 }
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221
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222 PyDoc_STRVAR(code_doc,
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223 "code(argcount, nlocals, stacksize, flags, codestring, constants, names,\n\
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224 varnames, filename, name, firstlineno, lnotab[, freevars[, cellvars]])\n\
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225 \n\
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226 Create a code object. Not for the faint of heart.");
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227
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228 static PyObject *
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229 code_new(PyTypeObject *type, PyObject *args, PyObject *kw)
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230 {
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231 int argcount;
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232 int nlocals;
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233 int stacksize;
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234 int flags;
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235 PyObject *co = NULL;
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236 PyObject *code;
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237 PyObject *consts;
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238 PyObject *names, *ournames = NULL;
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239 PyObject *varnames, *ourvarnames = NULL;
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240 PyObject *freevars = NULL, *ourfreevars = NULL;
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241 PyObject *cellvars = NULL, *ourcellvars = NULL;
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242 PyObject *filename;
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243 PyObject *name;
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244 int firstlineno;
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245 PyObject *lnotab;
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246
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247 if (!PyArg_ParseTuple(args, "iiiiSO!O!O!SSiS|O!O!:code",
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248 &argcount, &nlocals, &stacksize, &flags,
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249 &code,
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250 &PyTuple_Type, &consts,
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251 &PyTuple_Type, &names,
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252 &PyTuple_Type, &varnames,
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253 &filename, &name,
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254 &firstlineno, &lnotab,
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255 &PyTuple_Type, &freevars,
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256 &PyTuple_Type, &cellvars))
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257 return NULL;
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258
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259 if (argcount < 0) {
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260 PyErr_SetString(
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261 PyExc_ValueError,
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262 "code: argcount must not be negative");
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263 goto cleanup;
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264 }
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265
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266 if (nlocals < 0) {
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267 PyErr_SetString(
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268 PyExc_ValueError,
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269 "code: nlocals must not be negative");
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270 goto cleanup;
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271 }
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272
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273 ournames = validate_and_copy_tuple(names);
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274 if (ournames == NULL)
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275 goto cleanup;
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276 ourvarnames = validate_and_copy_tuple(varnames);
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277 if (ourvarnames == NULL)
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278 goto cleanup;
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279 if (freevars)
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280 ourfreevars = validate_and_copy_tuple(freevars);
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281 else
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282 ourfreevars = PyTuple_New(0);
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283 if (ourfreevars == NULL)
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284 goto cleanup;
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285 if (cellvars)
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286 ourcellvars = validate_and_copy_tuple(cellvars);
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287 else
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288 ourcellvars = PyTuple_New(0);
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289 if (ourcellvars == NULL)
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290 goto cleanup;
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291
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292 co = (PyObject *)PyCode_New(argcount, nlocals, stacksize, flags,
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293 code, consts, ournames, ourvarnames,
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294 ourfreevars, ourcellvars, filename,
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295 name, firstlineno, lnotab);
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296 cleanup:
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297 Py_XDECREF(ournames);
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298 Py_XDECREF(ourvarnames);
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299 Py_XDECREF(ourfreevars);
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300 Py_XDECREF(ourcellvars);
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301 return co;
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302 }
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303
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304 static void
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305 code_dealloc(PyCodeObject *co)
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306 {
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307 Py_XDECREF(co->co_code);
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308 Py_XDECREF(co->co_consts);
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309 Py_XDECREF(co->co_names);
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310 Py_XDECREF(co->co_varnames);
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311 Py_XDECREF(co->co_freevars);
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312 Py_XDECREF(co->co_cellvars);
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313 Py_XDECREF(co->co_filename);
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314 Py_XDECREF(co->co_name);
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315 Py_XDECREF(co->co_lnotab);
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316 if (co->co_zombieframe != NULL)
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317 PyObject_GC_Del(co->co_zombieframe);
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318 if (co->co_weakreflist != NULL)
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319 PyObject_ClearWeakRefs((PyObject*)co);
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320 PyObject_DEL(co);
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321 }
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322
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323 static PyObject *
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324 code_repr(PyCodeObject *co)
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325 {
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326 char buf[500];
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327 int lineno = -1;
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328 char *filename = "???";
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329 char *name = "???";
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330
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331 if (co->co_firstlineno != 0)
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332 lineno = co->co_firstlineno;
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333 if (co->co_filename && PyString_Check(co->co_filename))
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334 filename = PyString_AS_STRING(co->co_filename);
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335 if (co->co_name && PyString_Check(co->co_name))
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336 name = PyString_AS_STRING(co->co_name);
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337 PyOS_snprintf(buf, sizeof(buf),
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338 "<code object %.100s at %p, file \"%.300s\", line %d>",
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339 name, co, filename, lineno);
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340 return PyString_FromString(buf);
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341 }
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342
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343 static int
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344 code_compare(PyCodeObject *co, PyCodeObject *cp)
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345 {
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346 int cmp;
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347 cmp = PyObject_Compare(co->co_name, cp->co_name);
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348 if (cmp) return cmp;
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349 cmp = co->co_argcount - cp->co_argcount;
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350 if (cmp) goto normalize;
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351 cmp = co->co_nlocals - cp->co_nlocals;
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352 if (cmp) goto normalize;
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353 cmp = co->co_flags - cp->co_flags;
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354 if (cmp) goto normalize;
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355 cmp = co->co_firstlineno - cp->co_firstlineno;
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356 if (cmp) goto normalize;
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357 cmp = PyObject_Compare(co->co_code, cp->co_code);
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358 if (cmp) return cmp;
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359 cmp = PyObject_Compare(co->co_consts, cp->co_consts);
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360 if (cmp) return cmp;
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361 cmp = PyObject_Compare(co->co_names, cp->co_names);
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362 if (cmp) return cmp;
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363 cmp = PyObject_Compare(co->co_varnames, cp->co_varnames);
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364 if (cmp) return cmp;
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365 cmp = PyObject_Compare(co->co_freevars, cp->co_freevars);
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366 if (cmp) return cmp;
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367 cmp = PyObject_Compare(co->co_cellvars, cp->co_cellvars);
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368 return cmp;
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369
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370 normalize:
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371 if (cmp > 0)
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372 return 1;
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373 else if (cmp < 0)
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374 return -1;
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375 else
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376 return 0;
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377 }
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378
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.
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379 static PyObject *
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380 code_richcompare(PyObject *self, PyObject *other, int op)
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381 {
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382 PyCodeObject *co, *cp;
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383 int eq;
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384 PyObject *res;
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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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385
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386 if ((op != Py_EQ && op != Py_NE) ||
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387 !PyCode_Check(self) ||
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388 !PyCode_Check(other)) {
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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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diff changeset
389
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390 /* Py3K warning if types are not equal and comparison
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391 isn't == or != */
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392 if (PyErr_WarnPy3k("code inequality comparisons not supported "
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393 "in 3.x", 1) < 0) {
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394 return NULL;
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395 }
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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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396
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397 Py_INCREF(Py_NotImplemented);
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398 return Py_NotImplemented;
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399 }
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
400
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401 co = (PyCodeObject *)self;
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diff changeset
402 cp = (PyCodeObject *)other;
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
403
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404 eq = PyObject_RichCompareBool(co->co_name, cp->co_name, Py_EQ);
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405 if (eq <= 0) goto unequal;
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diff changeset
406 eq = co->co_argcount == cp->co_argcount;
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407 if (!eq) goto unequal;
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diff changeset
408 eq = co->co_nlocals == cp->co_nlocals;
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409 if (!eq) goto unequal;
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diff changeset
410 eq = co->co_flags == cp->co_flags;
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411 if (!eq) goto unequal;
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diff changeset
412 eq = co->co_firstlineno == cp->co_firstlineno;
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413 if (!eq) goto unequal;
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diff changeset
414 eq = PyObject_RichCompareBool(co->co_code, cp->co_code, Py_EQ);
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415 if (eq <= 0) goto unequal;
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416 eq = PyObject_RichCompareBool(co->co_consts, cp->co_consts, Py_EQ);
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417 if (eq <= 0) goto unequal;
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418 eq = PyObject_RichCompareBool(co->co_names, cp->co_names, Py_EQ);
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419 if (eq <= 0) goto unequal;
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420 eq = PyObject_RichCompareBool(co->co_varnames, cp->co_varnames, Py_EQ);
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421 if (eq <= 0) goto unequal;
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422 eq = PyObject_RichCompareBool(co->co_freevars, cp->co_freevars, Py_EQ);
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423 if (eq <= 0) goto unequal;
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424 eq = PyObject_RichCompareBool(co->co_cellvars, cp->co_cellvars, Py_EQ);
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diff changeset
425 if (eq <= 0) goto unequal;
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
426
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427 if (op == Py_EQ)
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428 res = Py_True;
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429 else
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430 res = Py_False;
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431 goto done;
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
432
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>
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433 unequal:
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434 if (eq < 0)
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435 return NULL;
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diff changeset
436 if (op == Py_NE)
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437 res = Py_True;
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438 else
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439 res = Py_False;
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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
440
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>
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diff changeset
441 done:
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442 Py_INCREF(res);
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443 return res;
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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
444 }
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
445
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diff changeset
446 static long
1c4d192f1568 Merge ast-branch to head
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447 code_hash(PyCodeObject *co)
1c4d192f1568 Merge ast-branch to head
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448 {
61465
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449 long h, h0, h1, h2, h3, h4, h5, h6;
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450 h0 = PyObject_Hash(co->co_name);
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451 if (h0 == -1) return -1;
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452 h1 = PyObject_Hash(co->co_code);
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453 if (h1 == -1) return -1;
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454 h2 = PyObject_Hash(co->co_consts);
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455 if (h2 == -1) return -1;
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456 h3 = PyObject_Hash(co->co_names);
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457 if (h3 == -1) return -1;
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458 h4 = PyObject_Hash(co->co_varnames);
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459 if (h4 == -1) return -1;
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460 h5 = PyObject_Hash(co->co_freevars);
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461 if (h5 == -1) return -1;
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462 h6 = PyObject_Hash(co->co_cellvars);
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463 if (h6 == -1) return -1;
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464 h = h0 ^ h1 ^ h2 ^ h3 ^ h4 ^ h5 ^ h6 ^
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465 co->co_argcount ^ co->co_nlocals ^ co->co_flags;
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466 if (h == -1) h = -2;
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467 return h;
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468 }
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469
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470 /* XXX code objects need to participate in GC? */
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471
1c4d192f1568 Merge ast-branch to head
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472 PyTypeObject PyCode_Type = {
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473 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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diff changeset
474 "code",
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diff changeset
475 sizeof(PyCodeObject),
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476 0,
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diff changeset
477 (destructor)code_dealloc, /* tp_dealloc */
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diff changeset
478 0, /* tp_print */
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diff changeset
479 0, /* tp_getattr */
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diff changeset
480 0, /* tp_setattr */
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diff changeset
481 (cmpfunc)code_compare, /* tp_compare */
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diff changeset
482 (reprfunc)code_repr, /* tp_repr */
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diff changeset
483 0, /* tp_as_number */
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diff changeset
484 0, /* tp_as_sequence */
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diff changeset
485 0, /* tp_as_mapping */
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diff changeset
486 (hashfunc)code_hash, /* tp_hash */
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diff changeset
487 0, /* tp_call */
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diff changeset
488 0, /* tp_str */
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diff changeset
489 PyObject_GenericGetAttr, /* tp_getattro */
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diff changeset
490 0, /* tp_setattro */
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diff changeset
491 0, /* tp_as_buffer */
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diff changeset
492 Py_TPFLAGS_DEFAULT, /* tp_flags */
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diff changeset
493 code_doc, /* tp_doc */
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diff changeset
494 0, /* tp_traverse */
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diff changeset
495 0, /* tp_clear */
61463
fd25030223b0 Untabify C files. Will watch buildbots.
Antoine Pitrou <solipsis@pitrou.net>
parents: 59694
diff changeset
496 code_richcompare, /* tp_richcompare */
fd25030223b0 Untabify C files. Will watch buildbots.
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parents: 59694
diff changeset
497 offsetof(PyCodeObject, co_weakreflist), /* tp_weaklistoffset */
61465
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diff changeset
498 0, /* tp_iter */
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diff changeset
499 0, /* tp_iternext */
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diff changeset
500 0, /* tp_methods */
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diff changeset
501 code_memberlist, /* tp_members */
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diff changeset
502 0, /* tp_getset */
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diff changeset
503 0, /* tp_base */
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diff changeset
504 0, /* tp_dict */
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diff changeset
505 0, /* tp_descr_get */
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diff changeset
506 0, /* tp_descr_set */
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diff changeset
507 0, /* tp_dictoffset */
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diff changeset
508 0, /* tp_init */
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diff changeset
509 0, /* tp_alloc */
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diff changeset
510 code_new, /* tp_new */
35742
1c4d192f1568 Merge ast-branch to head
Jeremy Hylton <jeremy@alum.mit.edu>
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diff changeset
511 };
1c4d192f1568 Merge ast-branch to head
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diff changeset
512
54297
dddf424bd669 Issue #6042:
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parents: 53930
diff changeset
513 /* Use co_lnotab to compute the line number from a bytecode index, addrq. See
dddf424bd669 Issue #6042:
Jeffrey Yasskin <jyasskin@gmail.com>
parents: 53930
diff changeset
514 lnotab_notes.txt for the details of the lnotab representation.
35742
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diff changeset
515 */
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diff changeset
516
1c4d192f1568 Merge ast-branch to head
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diff changeset
517 int
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diff changeset
518 PyCode_Addr2Line(PyCodeObject *co, int addrq)
1c4d192f1568 Merge ast-branch to head
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diff changeset
519 {
61465
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diff changeset
520 int size = PyString_Size(co->co_lnotab) / 2;
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521 unsigned char *p = (unsigned char*)PyString_AsString(co->co_lnotab);
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522 int line = co->co_firstlineno;
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523 int addr = 0;
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524 while (--size >= 0) {
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525 addr += *p++;
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526 if (addr > addrq)
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527 break;
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528 line += *p++;
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529 }
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530 return line;
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531 }
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532
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533 /* Update *bounds to describe the first and one-past-the-last instructions in
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534 the same line as lasti. Return the number of that line. */
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535 int
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536 _PyCode_CheckLineNumber(PyCodeObject* co, int lasti, PyAddrPair *bounds)
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537 {
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538 int size, addr, line;
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539 unsigned char* p;
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540
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541 p = (unsigned char*)PyString_AS_STRING(co->co_lnotab);
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542 size = PyString_GET_SIZE(co->co_lnotab) / 2;
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543
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544 addr = 0;
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545 line = co->co_firstlineno;
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546 assert(line > 0);
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547
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548 /* possible optimization: if f->f_lasti == instr_ub
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549 (likely to be a common case) then we already know
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550 instr_lb -- if we stored the matching value of p
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551 somwhere we could skip the first while loop. */
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552
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553 /* See lnotab_notes.txt for the description of
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554 co_lnotab. A point to remember: increments to p
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555 come in (addr, line) pairs. */
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556
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557 bounds->ap_lower = 0;
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558 while (size > 0) {
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559 if (addr + *p > lasti)
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560 break;
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561 addr += *p++;
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562 if (*p)
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563 bounds->ap_lower = addr;
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564 line += *p++;
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565 --size;
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566 }
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567
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568 if (size > 0) {
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569 while (--size >= 0) {
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570 addr += *p++;
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571 if (*p++)
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572 break;
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573 }
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574 bounds->ap_upper = addr;
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575 }
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576 else {
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577 bounds->ap_upper = INT_MAX;
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578 }
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579
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580 return line;
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581 }