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annotate paraspace/injection.py @ 96:1769e52bdd9d

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Make dexfile_insert_class() pass the testcase
author Thinker K.F. Li <thinker@codemud.net>
date Mon, 25 Jul 2011 16:49:28 +0800
parents 88645ab29aeb
children c0c127c7b37e
rev   line source
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1
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2 def _relocatable_children(obj):
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3 from paraspace.dexfile import relocatable
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5 attr_value_pairs = [(attr, getattr(obj, attr)) for attr in dir(obj)]
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6 rel_children = [(attr, value) for attr, value in attr_value_pairs
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7 if isinstance(value, relocatable)]
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8 return rel_children
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11 ## \brief Travel relocatable descendants.
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12 #
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13 # \param cloner is the function to return a clone.
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14 # \param adjuster is called to adjust the clone.
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15 # \param visit_log is a dictionary to keep clones.
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16 #
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17 def _travel_desc_relocatable(obj, worker, visit_log):
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18 if id(obj) in visit_log:
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19 return visit_log[id(obj)]
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20
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21 result = worker(obj)
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22 visit_log[id(obj)] = result
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23
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24 rel_children = _relocatable_children(obj)
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25 for attr, value in rel_children:
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26 _travel_desc_relocatable(value, worker, visit_log)
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27 pass
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28 pass
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29
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30
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31 ## \brief Return name string of a linked class definition item.
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32 def classdef_name(classdef):
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33 return classdef.classIdx.descriptorIdx.stringDataOff.data
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34
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35
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36 ## \brief Return a map that map type of a object to the list of a DEXFile.
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37 def dex_type_2_array_attr_map():
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38 global dex_type_2_array_attr_map
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39 from paraspace.dexfile import DEXFile, array
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40
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41 attr_values = [(attr, getattr(DEXFile, attr))
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42 for attr in dir(DEXFile)]
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43 type_2_attr = dict([(value.child_type, attr)
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44 for attr, value in attr_values
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45 if isinstance(value, array)])
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46
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47 dex_type_2_array_attr_map = lambda: type_2_attr
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48
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49 return type_2_attr
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50
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51
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52 ## \brief Append a object to appropriate list of a DEXFile object.
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53 #
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54 # Skip the object if found no appropriate list.
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55 #
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56 def dex_append_obj_list(dex, obj):
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57 from paraspace.dex_deptracker import _dex_tree_get_child
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58 from paraspace.dex_deptracker import _dex_tree_set_child
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59
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60 type_2_attr = dex_type_2_array_attr_map()
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61 try:
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62 attr = type_2_attr[obj.__class__]
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63 except KeyError:
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64 return
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65
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66 array = getattr(dex, attr)
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67 array.items.append(obj)
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68
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69 count_name = array.count_name
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70 if count_name:
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71 count = _dex_tree_get_child(dex, count_name)
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72 _dex_tree_set_child(dex, count_name, count + 1)
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73 pass
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74 pass
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75
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76
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77 ## \brief Clone a class definition item
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78 #
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79 # \param dex is the DEXFile that clazz is cloning for.
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80 # \param clazz is the class definition item that is cloning.
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81 #
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82 def _clone_classdef(dex, clazz):
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83 from copy import copy
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84 from paraspace.dexfile import _DEX_StringDataItem, _DEX_StringId
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85 from paraspace.dexfile import _DEX_TypeId
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86
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87 visit_log = {}
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89 def cloner(obj):
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90 clone = copy(obj)
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91 return clone
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92
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93 def relink_dependencies(clone):
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94 rel_children = _relocatable_children(clone)
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95 for attr, value in rel_children:
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96 clone_value = visit_log[id(value)]
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97 setattr(clone, attr, clone_value)
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98 pass
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99 pass
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100
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101 def merge_unique_strdata():
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102 strdatas = [(obj_id, obj)
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103 for obj_id, obj in visit_log.items()
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104 if isinstance(obj, _DEX_StringDataItem)]
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105 dex_str_2_strdata = dict([(strdata.data, strdata)
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106 for strdata in dex.stringDataItems.items])
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107 for obj_id, strdata in strdatas:
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108 if strdata.data in dex_str_2_strdata:
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109 visit_log[obj_id] = dex_str_2_strdata[strdata]
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110 else:
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111 dex_append_obj_list(dex, strdata)
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112 pass
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113 pass
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114 pass
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115
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116 def merge_unique_strid():
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117 strids = [(obj_id, obj)
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118 for obj_id, obj in visit_log.items()
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119 if isinstance(obj, _DEX_StringId)]
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120
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121 for obj_id, strid in strids:
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122 relink_dependencies(strid)
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123 pass
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124
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125 strdata_2_strid = dict([(strid.stringDataOff, strid)
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126 for strid in dex.stringIds.items])
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127 for obj_id, strid in strids:
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128 if strid.stringDataOff in strdata_2_strid:
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129 visit_log[obj_id] = strdata_2_strid[strid.stringDataOff]
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130 else:
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131 dex_append_obj_list(dex, strid)
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132 pass
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133 pass
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134 pass
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135
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136 def merge_unique_typeid():
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137 typeids = [(obj_id, obj)
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138 for obj_id, obj in visit_log.items()
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139 if isinstance(obj, _DEX_TypeId)]
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140
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141 for obj_id, typeid in typeids:
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142 relink_dependencies(typeid)
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143 pass
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144
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145 strid_2_typeid = dict([(typeid.descriptorIdx, typeid)
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146 for typeid in dex.typeIds.items])
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147 for obj_id, typeid in typeids:
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148 if typeid.descriptorIdx in strid_2_typeid:
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149 visit_log[obj_id] = strid_2_typeid[typeid.descriptorIdx]
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150 else:
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151 dex_append_obj_list(dex, typeid)
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152 pass
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153 pass
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154 pass
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155
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156 def has_classdef(clazz):
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157 class_typeIds = set([classdef.classIdx
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158 for classdef in dex.classDefs.items])
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159 return clazz.classIdx in class_typeIds
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160
96
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161 _travel_desc_relocatable(clazz, cloner, visit_log)
88
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162
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163 merge_unique_strdata()
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164 merge_unique_strid()
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165 merge_unique_typeid()
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166
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167 for obj in visit_log.values():
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168 if isinstance(obj, (_DEX_StringDataItem,
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169 _DEX_StringId,
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170 _DEX_TypeId)):
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171 continue
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172 relink_dependencies(obj)
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173 dex_append_obj_list(dex, obj)
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174 pass
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175
96
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176 if has_classdef(clazz):
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177 raise RuntimeError, \
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178 'clone a class \'%s\'that is already in the DEXFile' % \
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179 classdef_name(clazz)
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180
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181 clone = visit_log[id(clazz)]
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182 return clone
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183
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184
94
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185 ## \brief Clone a class definition and insert into a DEXFile.
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186 #
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187 # This function clone a class definition from a linked DEXFile and
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188 # insert it into another one.
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189 #
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190 # \param dex is a DEXFile_linked to insert the clone.
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191 # \param class_def is a class definition going to be cloned.
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192 #
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193 def dexfile_insert_class(dex, class_def):
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194 clone = _clone_classdef(dex, class_def)
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195 return clone