Mercurial > cpython-lru_cache-weakref

annotate Objects/codeobject.c @ 65494:e8969fb822fc

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make hashes always the size of pointers; introduce Py_hash_t #9778
author Benjamin Peterson <benjamin@python.org>
date Sun, 17 Oct 2010 20:54:53 +0000
parents 6b8314376de2
children 3bf4d9f1660a
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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(Py_UNICODE *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 (*s >= 128)
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23 return 0;
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24 if (ok_name_char[*s++] == 0)
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25 return 0;
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26 }
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27 return 1;
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28 }
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29
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30 static void
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31 intern_strings(PyObject *tuple)
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32 {
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33 Py_ssize_t i;
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34
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35 for (i = PyTuple_GET_SIZE(tuple); --i >= 0; ) {
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36 PyObject *v = PyTuple_GET_ITEM(tuple, i);
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37 if (v == NULL || !PyUnicode_CheckExact(v)) {
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38 Py_FatalError("non-string found in code slot");
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39 }
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40 PyUnicode_InternInPlace(&PyTuple_GET_ITEM(tuple, i));
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41 }
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42 }
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43
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44
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45 PyCodeObject *
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46 PyCode_New(int argcount, int kwonlyargcount,
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47 int nlocals, int stacksize, int flags,
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48 PyObject *code, PyObject *consts, PyObject *names,
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49 PyObject *varnames, PyObject *freevars, PyObject *cellvars,
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50 PyObject *filename, PyObject *name, int firstlineno,
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51 PyObject *lnotab)
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52 {
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53 PyCodeObject *co;
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54 Py_ssize_t i;
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55
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56 /* Check argument types */
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57 if (argcount < 0 || kwonlyargcount < 0 || nlocals < 0 ||
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58 code == NULL ||
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59 consts == NULL || !PyTuple_Check(consts) ||
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60 names == NULL || !PyTuple_Check(names) ||
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61 varnames == NULL || !PyTuple_Check(varnames) ||
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62 freevars == NULL || !PyTuple_Check(freevars) ||
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63 cellvars == NULL || !PyTuple_Check(cellvars) ||
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64 name == NULL || !PyUnicode_Check(name) ||
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65 filename == NULL || !PyUnicode_Check(filename) ||
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66 lnotab == NULL || !PyBytes_Check(lnotab) ||
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67 !PyObject_CheckReadBuffer(code)) {
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68 PyErr_BadInternalCall();
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69 return NULL;
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70 }
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71 intern_strings(names);
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72 intern_strings(varnames);
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73 intern_strings(freevars);
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74 intern_strings(cellvars);
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75 /* Intern selected string constants */
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76 for (i = PyTuple_Size(consts); --i >= 0; ) {
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77 PyObject *v = PyTuple_GetItem(consts, i);
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78 if (!PyUnicode_Check(v))
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79 continue;
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80 if (!all_name_chars(PyUnicode_AS_UNICODE(v)))
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81 continue;
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82 PyUnicode_InternInPlace(&PyTuple_GET_ITEM(consts, i));
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83 }
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84 co = PyObject_NEW(PyCodeObject, &PyCode_Type);
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85 if (co != NULL) {
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86 co->co_argcount = argcount;
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87 co->co_kwonlyargcount = kwonlyargcount;
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88 co->co_nlocals = nlocals;
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89 co->co_stacksize = stacksize;
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90 co->co_flags = flags;
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91 Py_INCREF(code);
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92 co->co_code = code;
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93 Py_INCREF(consts);
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94 co->co_consts = consts;
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95 Py_INCREF(names);
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96 co->co_names = names;
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97 Py_INCREF(varnames);
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98 co->co_varnames = varnames;
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99 Py_INCREF(freevars);
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100 co->co_freevars = freevars;
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101 Py_INCREF(cellvars);
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102 co->co_cellvars = cellvars;
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103 Py_INCREF(filename);
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104 co->co_filename = filename;
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105 Py_INCREF(name);
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106 co->co_name = name;
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107 co->co_firstlineno = firstlineno;
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108 Py_INCREF(lnotab);
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109 co->co_lnotab = lnotab;
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110 co->co_zombieframe = NULL;
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111 co->co_weakreflist = NULL;
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112 }
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113 return co;
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114 }
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115
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116 PyCodeObject *
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117 PyCode_NewEmpty(const char *filename, const char *funcname, int firstlineno)
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118 {
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119 static PyObject *emptystring = NULL;
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120 static PyObject *nulltuple = NULL;
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121 PyObject *filename_ob = NULL;
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122 PyObject *funcname_ob = NULL;
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123 PyCodeObject *result = NULL;
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124 if (emptystring == NULL) {
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125 emptystring = PyBytes_FromString("");
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126 if (emptystring == NULL)
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127 goto failed;
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128 }
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129 if (nulltuple == NULL) {
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130 nulltuple = PyTuple_New(0);
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131 if (nulltuple == NULL)
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132 goto failed;
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133 }
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134 funcname_ob = PyUnicode_FromString(funcname);
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135 if (funcname_ob == NULL)
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136 goto failed;
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137 filename_ob = PyUnicode_DecodeFSDefault(filename);
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138 if (filename_ob == NULL)
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139 goto failed;
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140
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141 result = PyCode_New(0, /* argcount */
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142 0, /* kwonlyargcount */
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143 0, /* nlocals */
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144 0, /* stacksize */
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145 0, /* flags */
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146 emptystring, /* code */
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147 nulltuple, /* consts */
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148 nulltuple, /* names */
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149 nulltuple, /* varnames */
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150 nulltuple, /* freevars */
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151 nulltuple, /* cellvars */
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152 filename_ob, /* filename */
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153 funcname_ob, /* name */
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154 firstlineno, /* firstlineno */
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155 emptystring /* lnotab */
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156 );
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157
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158 failed:
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159 Py_XDECREF(funcname_ob);
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160 Py_XDECREF(filename_ob);
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161 return result;
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162 }
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163
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164 #define OFF(x) offsetof(PyCodeObject, x)
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165
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166 static PyMemberDef code_memberlist[] = {
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167 {"co_argcount", T_INT, OFF(co_argcount), READONLY},
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168 {"co_kwonlyargcount", T_INT, OFF(co_kwonlyargcount), READONLY},
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169 {"co_nlocals", T_INT, OFF(co_nlocals), READONLY},
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170 {"co_stacksize",T_INT, OFF(co_stacksize), READONLY},
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171 {"co_flags", T_INT, OFF(co_flags), READONLY},
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172 {"co_code", T_OBJECT, OFF(co_code), READONLY},
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173 {"co_consts", T_OBJECT, OFF(co_consts), READONLY},
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174 {"co_names", T_OBJECT, OFF(co_names), READONLY},
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175 {"co_varnames", T_OBJECT, OFF(co_varnames), READONLY},
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176 {"co_freevars", T_OBJECT, OFF(co_freevars), READONLY},
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177 {"co_cellvars", T_OBJECT, OFF(co_cellvars), READONLY},
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178 {"co_filename", T_OBJECT, OFF(co_filename), READONLY},
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179 {"co_name", T_OBJECT, OFF(co_name), READONLY},
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180 {"co_firstlineno", T_INT, OFF(co_firstlineno), READONLY},
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181 {"co_lnotab", T_OBJECT, OFF(co_lnotab), READONLY},
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182 {NULL} /* Sentinel */
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183 };
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184
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185 /* Helper for code_new: return a shallow copy of a tuple that is
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186 guaranteed to contain exact strings, by converting string subclasses
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187 to exact strings and complaining if a non-string is found. */
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188 static PyObject*
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189 validate_and_copy_tuple(PyObject *tup)
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190 {
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191 PyObject *newtuple;
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192 PyObject *item;
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193 Py_ssize_t i, len;
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194
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195 len = PyTuple_GET_SIZE(tup);
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196 newtuple = PyTuple_New(len);
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197 if (newtuple == NULL)
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198 return NULL;
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199
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200 for (i = 0; i < len; i++) {
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201 item = PyTuple_GET_ITEM(tup, i);
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202 if (PyUnicode_CheckExact(item)) {
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203 Py_INCREF(item);
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204 }
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205 else if (!PyUnicode_Check(item)) {
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206 PyErr_Format(
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207 PyExc_TypeError,
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208 "name tuples must contain only "
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209 "strings, not '%.500s'",
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210 item->ob_type->tp_name);
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211 Py_DECREF(newtuple);
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212 return NULL;
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213 }
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214 else {
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215 item = PyUnicode_FromUnicode(
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216 PyUnicode_AS_UNICODE(item),
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217 PyUnicode_GET_SIZE(item));
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218 if (item == NULL) {
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219 Py_DECREF(newtuple);
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220 return NULL;
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221 }
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222 }
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223 PyTuple_SET_ITEM(newtuple, i, item);
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224 }
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225
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226 return newtuple;
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227 }
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228
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229 PyDoc_STRVAR(code_doc,
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230 "code(argcount, kwonlyargcount, nlocals, stacksize, flags, codestring,\n\
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231 constants, names, varnames, filename, name, firstlineno,\n\
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232 lnotab[, freevars[, cellvars]])\n\
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233 \n\
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234 Create a code object. Not for the faint of heart.");
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235
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236 static PyObject *
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237 code_new(PyTypeObject *type, PyObject *args, PyObject *kw)
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238 {
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239 int argcount;
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240 int kwonlyargcount;
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241 int nlocals;
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242 int stacksize;
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243 int flags;
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244 PyObject *co = NULL;
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245 PyObject *code;
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246 PyObject *consts;
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247 PyObject *names, *ournames = NULL;
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248 PyObject *varnames, *ourvarnames = NULL;
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249 PyObject *freevars = NULL, *ourfreevars = NULL;
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250 PyObject *cellvars = NULL, *ourcellvars = NULL;
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251 PyObject *filename;
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252 PyObject *name;
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253 int firstlineno;
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254 PyObject *lnotab;
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255
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256 if (!PyArg_ParseTuple(args, "iiiiiSO!O!O!UUiS|O!O!:code",
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257 &argcount, &kwonlyargcount,
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258 &nlocals, &stacksize, &flags,
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259 &code,
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260 &PyTuple_Type, &consts,
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261 &PyTuple_Type, &names,
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262 &PyTuple_Type, &varnames,
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263 &filename, &name,
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264 &firstlineno, &lnotab,
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265 &PyTuple_Type, &freevars,
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266 &PyTuple_Type, &cellvars))
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267 return NULL;
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268
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269 if (argcount < 0) {
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270 PyErr_SetString(
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271 PyExc_ValueError,
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272 "code: argcount must not be negative");
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273 goto cleanup;
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274 }
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275
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276 if (kwonlyargcount < 0) {
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277 PyErr_SetString(
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278 PyExc_ValueError,
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279 "code: kwonlyargcount must not be negative");
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280 goto cleanup;
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281 }
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282 if (nlocals < 0) {
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283 PyErr_SetString(
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284 PyExc_ValueError,
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285 "code: nlocals must not be negative");
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286 goto cleanup;
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287 }
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288
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289 ournames = validate_and_copy_tuple(names);
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290 if (ournames == NULL)
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291 goto cleanup;
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292 ourvarnames = validate_and_copy_tuple(varnames);
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293 if (ourvarnames == NULL)
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294 goto cleanup;
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295 if (freevars)
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296 ourfreevars = validate_and_copy_tuple(freevars);
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297 else
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298 ourfreevars = PyTuple_New(0);
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299 if (ourfreevars == NULL)
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300 goto cleanup;
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301 if (cellvars)
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302 ourcellvars = validate_and_copy_tuple(cellvars);
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303 else
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304 ourcellvars = PyTuple_New(0);
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305 if (ourcellvars == NULL)
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306 goto cleanup;
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307
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308 co = (PyObject *)PyCode_New(argcount, kwonlyargcount,
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309 nlocals, stacksize, flags,
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310 code, consts, ournames, ourvarnames,
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311 ourfreevars, ourcellvars, filename,
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312 name, firstlineno, lnotab);
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313 cleanup:
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314 Py_XDECREF(ournames);
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315 Py_XDECREF(ourvarnames);
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316 Py_XDECREF(ourfreevars);
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317 Py_XDECREF(ourcellvars);
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318 return co;
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319 }
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320
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321 static void
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322 code_dealloc(PyCodeObject *co)
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323 {
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324 Py_XDECREF(co->co_code);
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325 Py_XDECREF(co->co_consts);
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326 Py_XDECREF(co->co_names);
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327 Py_XDECREF(co->co_varnames);
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328 Py_XDECREF(co->co_freevars);
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329 Py_XDECREF(co->co_cellvars);
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330 Py_XDECREF(co->co_filename);
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331 Py_XDECREF(co->co_name);
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332 Py_XDECREF(co->co_lnotab);
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333 if (co->co_zombieframe != NULL)
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334 PyObject_GC_Del(co->co_zombieframe);
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335 if (co->co_weakreflist != NULL)
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336 PyObject_ClearWeakRefs((PyObject*)co);
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337 PyObject_DEL(co);
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338 }
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339
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340 static PyObject *
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341 code_repr(PyCodeObject *co)
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342 {
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343 int lineno;
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344 if (co->co_firstlineno != 0)
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345 lineno = co->co_firstlineno;
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346 else
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347 lineno = -1;
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348 if (co->co_filename && PyUnicode_Check(co->co_filename)) {
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349 return PyUnicode_FromFormat(
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350 "<code object %.100U at %p, file \"%.300U\", line %d>",
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351 co->co_name, co, co->co_filename, lineno);
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352 } else {
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353 return PyUnicode_FromFormat(
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354 "<code object %.100U at %p, file ???, line %d>",
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355 co->co_name, co, lineno);
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356 }
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357 }
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358
39644
13d5e5f0e993 Restructure comparison dramatically. There is no longer a default
Guido van Rossum <guido@python.org>
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359 static PyObject *
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360 code_richcompare(PyObject *self, PyObject *other, int op)
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361 {
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362 PyCodeObject *co, *cp;
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363 int eq;
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364 PyObject *res;
39650
69f61f90c4fc Implement == and != comparisons for code objects by value.
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diff changeset
365
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366 if ((op != Py_EQ && op != Py_NE) ||
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367 !PyCode_Check(self) ||
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368 !PyCode_Check(other)) {
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369 Py_INCREF(Py_NotImplemented);
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370 return Py_NotImplemented;
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371 }
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diff changeset
372
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373 co = (PyCodeObject *)self;
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374 cp = (PyCodeObject *)other;
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diff changeset
375
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376 eq = PyObject_RichCompareBool(co->co_name, cp->co_name, Py_EQ);
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377 if (eq <= 0) goto unequal;
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378 eq = co->co_argcount == cp->co_argcount;
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379 if (!eq) goto unequal;
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380 eq = co->co_kwonlyargcount == cp->co_kwonlyargcount;
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381 if (!eq) goto unequal;
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382 eq = co->co_nlocals == cp->co_nlocals;
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383 if (!eq) goto unequal;
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384 eq = co->co_flags == cp->co_flags;
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385 if (!eq) goto unequal;
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386 eq = co->co_firstlineno == cp->co_firstlineno;
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387 if (!eq) goto unequal;
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388 eq = PyObject_RichCompareBool(co->co_code, cp->co_code, Py_EQ);
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389 if (eq <= 0) goto unequal;
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390 eq = PyObject_RichCompareBool(co->co_consts, cp->co_consts, Py_EQ);
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diff changeset
391 if (eq <= 0) goto unequal;
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392 eq = PyObject_RichCompareBool(co->co_names, cp->co_names, Py_EQ);
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393 if (eq <= 0) goto unequal;
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diff changeset
394 eq = PyObject_RichCompareBool(co->co_varnames, cp->co_varnames, Py_EQ);
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395 if (eq <= 0) goto unequal;
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396 eq = PyObject_RichCompareBool(co->co_freevars, cp->co_freevars, Py_EQ);
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diff changeset
397 if (eq <= 0) goto unequal;
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398 eq = PyObject_RichCompareBool(co->co_cellvars, cp->co_cellvars, Py_EQ);
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diff changeset
399 if (eq <= 0) goto unequal;
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diff changeset
400
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401 if (op == Py_EQ)
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402 res = Py_True;
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403 else
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404 res = Py_False;
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diff changeset
405 goto done;
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69f61f90c4fc Implement == and != comparisons for code objects by value.
Guido van Rossum <guido@python.org>
parents: 39644
diff changeset
406
69f61f90c4fc Implement == and != comparisons for code objects by value.
Guido van Rossum <guido@python.org>
parents: 39644
diff changeset
407 unequal:
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408 if (eq < 0)
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409 return NULL;
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410 if (op == Py_NE)
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411 res = Py_True;
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412 else
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413 res = Py_False;
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Guido van Rossum <guido@python.org>
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diff changeset
414
69f61f90c4fc Implement == and != comparisons for code objects by value.
Guido van Rossum <guido@python.org>
parents: 39644
diff changeset
415 done:
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416 Py_INCREF(res);
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417 return res;
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418 }
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419
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420 static Py_hash_t
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421 code_hash(PyCodeObject *co)
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422 {
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423 Py_hash_t h, h0, h1, h2, h3, h4, h5, h6;
61466
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424 h0 = PyObject_Hash(co->co_name);
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425 if (h0 == -1) return -1;
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426 h1 = PyObject_Hash(co->co_code);
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427 if (h1 == -1) return -1;
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428 h2 = PyObject_Hash(co->co_consts);
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429 if (h2 == -1) return -1;
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430 h3 = PyObject_Hash(co->co_names);
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431 if (h3 == -1) return -1;
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432 h4 = PyObject_Hash(co->co_varnames);
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433 if (h4 == -1) return -1;
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434 h5 = PyObject_Hash(co->co_freevars);
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435 if (h5 == -1) return -1;
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436 h6 = PyObject_Hash(co->co_cellvars);
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437 if (h6 == -1) return -1;
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438 h = h0 ^ h1 ^ h2 ^ h3 ^ h4 ^ h5 ^ h6 ^
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439 co->co_argcount ^ co->co_kwonlyargcount ^
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440 co->co_nlocals ^ co->co_flags;
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441 if (h == -1) h = -2;
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442 return h;
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443 }
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444
1c4d192f1568 Merge ast-branch to head
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445 /* XXX code objects need to participate in GC? */
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446
1c4d192f1568 Merge ast-branch to head
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447 PyTypeObject PyCode_Type = {
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448 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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449 "code",
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450 sizeof(PyCodeObject),
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451 0,
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452 (destructor)code_dealloc, /* tp_dealloc */
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453 0, /* tp_print */
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diff changeset
454 0, /* tp_getattr */
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455 0, /* tp_setattr */
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456 0, /* tp_reserved */
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457 (reprfunc)code_repr, /* tp_repr */
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458 0, /* tp_as_number */
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diff changeset
459 0, /* tp_as_sequence */
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diff changeset
460 0, /* tp_as_mapping */
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461 (hashfunc)code_hash, /* tp_hash */
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diff changeset
462 0, /* tp_call */
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463 0, /* tp_str */
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464 PyObject_GenericGetAttr, /* tp_getattro */
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diff changeset
465 0, /* tp_setattro */
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466 0, /* tp_as_buffer */
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467 Py_TPFLAGS_DEFAULT, /* tp_flags */
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diff changeset
468 code_doc, /* tp_doc */
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469 0, /* tp_traverse */
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diff changeset
470 0, /* tp_clear */
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471 code_richcompare, /* tp_richcompare */
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diff changeset
472 offsetof(PyCodeObject, co_weakreflist), /* tp_weaklistoffset */
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diff changeset
473 0, /* tp_iter */
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diff changeset
474 0, /* tp_iternext */
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diff changeset
475 0, /* tp_methods */
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diff changeset
476 code_memberlist, /* tp_members */
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diff changeset
477 0, /* tp_getset */
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diff changeset
478 0, /* tp_base */
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diff changeset
479 0, /* tp_dict */
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diff changeset
480 0, /* tp_descr_get */
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481 0, /* tp_descr_set */
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diff changeset
482 0, /* tp_dictoffset */
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diff changeset
483 0, /* tp_init */
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diff changeset
484 0, /* tp_alloc */
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diff changeset
485 code_new, /* tp_new */
35742
1c4d192f1568 Merge ast-branch to head
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486 };
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487
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diff changeset
488 /* Use co_lnotab to compute the line number from a bytecode index, addrq. See
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diff changeset
489 lnotab_notes.txt for the details of the lnotab representation.
35742
1c4d192f1568 Merge ast-branch to head
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490 */
1c4d192f1568 Merge ast-branch to head
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491
1c4d192f1568 Merge ast-branch to head
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492 int
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493 PyCode_Addr2Line(PyCodeObject *co, int addrq)
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494 {
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495 int size = PyBytes_Size(co->co_lnotab) / 2;
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496 unsigned char *p = (unsigned char*)PyBytes_AsString(co->co_lnotab);
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497 int line = co->co_firstlineno;
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498 int addr = 0;
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499 while (--size >= 0) {
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500 addr += *p++;
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501 if (addr > addrq)
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502 break;
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503 line += *p++;
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504 }
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505 return line;
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1c4d192f1568 Merge ast-branch to head
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506 }
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507
55372
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508 /* Update *bounds to describe the first and one-past-the-last instructions in
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509 the same line as lasti. Return the number of that line. */
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510 int
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511 _PyCode_CheckLineNumber(PyCodeObject* co, int lasti, PyAddrPair *bounds)
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512 {
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513 int size, addr, line;
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514 unsigned char* p;
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515
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516 p = (unsigned char*)PyBytes_AS_STRING(co->co_lnotab);
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517 size = PyBytes_GET_SIZE(co->co_lnotab) / 2;
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518
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519 addr = 0;
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520 line = co->co_firstlineno;
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521 assert(line > 0);
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522
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523 /* possible optimization: if f->f_lasti == instr_ub
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524 (likely to be a common case) then we already know
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525 instr_lb -- if we stored the matching value of p
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526 somwhere we could skip the first while loop. */
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527
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528 /* See lnotab_notes.txt for the description of
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529 co_lnotab. A point to remember: increments to p
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530 come in (addr, line) pairs. */
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531
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532 bounds->ap_lower = 0;
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533 while (size > 0) {
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534 if (addr + *p > lasti)
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535 break;
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536 addr += *p++;
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537 if (*p)
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538 bounds->ap_lower = addr;
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539 line += *p++;
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540 --size;
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541 }
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542
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543 if (size > 0) {
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544 while (--size >= 0) {
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545 addr += *p++;
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546 if (*p++)
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547 break;
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548 }
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549 bounds->ap_upper = addr;
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550 }
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551 else {
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552 bounds->ap_upper = INT_MAX;
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553 }
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554
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555 return line;
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556 }