1 """ 2 LLDB AppKit formatters 3 4 part of The LLVM Compiler Infrastructure 5 This file is distributed under the University of Illinois Open Source 6 License. See LICENSE.TXT for details. 7 """ 8 # example summary provider for NSNumber 9 # the real summary is now C++ code built into LLDB 10 import lldb 11 import ctypes 12 import lldb.runtime.objc.objc_runtime 13 import lldb.formatters.metrics 14 import struct 15 import lldb.formatters.Logger 16 17 statistics = lldb.formatters.metrics.Metrics() 18 statistics.add_metric('invalid_isa') 19 statistics.add_metric('invalid_pointer') 20 statistics.add_metric('unknown_class') 21 statistics.add_metric('code_notrun') 22 23 # despite the similary to synthetic children providers, these classes are not 24 # trying to provide anything but the port number of an NSNumber, so they need not 25 # obey the interface specification for synthetic children providers 26 class NSTaggedNumber_SummaryProvider: 27 def adjust_for_architecture(self): 28 pass 29 30 def __init__(self, valobj, info_bits, data, params): 31 logger = lldb.formatters.Logger.Logger() 32 self.valobj = valobj; 33 self.sys_params = params 34 self.info_bits = info_bits 35 self.data = data 36 self.update(); 37 38 def update(self): 39 logger = lldb.formatters.Logger.Logger() 40 self.adjust_for_architecture(); 41 42 def value(self): 43 logger = lldb.formatters.Logger.Logger() 44 # in spite of the plenty of types made available by the public NSNumber API 45 # only a bunch of these are actually used in the internal implementation 46 # unfortunately, the original type information appears to be lost 47 # so we try to at least recover the proper magnitude of the data 48 if self.info_bits == 0: 49 return '(char)' + str(ord(ctypes.c_char(chr(self.data % 256)).value)) 50 if self.info_bits == 4: 51 return '(short)' + str(ctypes.c_short(self.data % (256*256)).value) 52 if self.info_bits == 8: 53 return '(int)' + str(ctypes.c_int(self.data % (256*256*256*256)).value) 54 if self.info_bits == 12: 55 return '(long)' + str(ctypes.c_long(self.data).value) 56 else: 57 return 'unexpected value:(info=' + str(self.info_bits) + ", value = " + str(self.data) + ')' 58 59 60 class NSUntaggedNumber_SummaryProvider: 61 def adjust_for_architecture(self): 62 pass 63 64 def __init__(self, valobj, params): 65 logger = lldb.formatters.Logger.Logger() 66 self.valobj = valobj; 67 self.sys_params = params 68 if not(self.sys_params.types_cache.char): 69 self.sys_params.types_cache.char = self.valobj.GetType().GetBasicType(lldb.eBasicTypeChar) 70 if not(self.sys_params.types_cache.short): 71 self.sys_params.types_cache.short = self.valobj.GetType().GetBasicType(lldb.eBasicTypeShort) 72 if not(self.sys_params.types_cache.ushort): 73 self.sys_params.types_cache.ushort = self.valobj.GetType().GetBasicType(lldb.eBasicTypeUnsignedShort) 74 if not(self.sys_params.types_cache.int): 75 self.sys_params.types_cache.int = self.valobj.GetType().GetBasicType(lldb.eBasicTypeInt) 76 if not(self.sys_params.types_cache.long): 77 self.sys_params.types_cache.long = self.valobj.GetType().GetBasicType(lldb.eBasicTypeLong) 78 if not(self.sys_params.types_cache.ulong): 79 self.sys_params.types_cache.ulong = self.valobj.GetType().GetBasicType(lldb.eBasicTypeUnsignedLong) 80 if not(self.sys_params.types_cache.longlong): 81 self.sys_params.types_cache.longlong = self.valobj.GetType().GetBasicType(lldb.eBasicTypeLongLong) 82 if not(self.sys_params.types_cache.ulonglong): 83 self.sys_params.types_cache.ulonglong = self.valobj.GetType().GetBasicType(lldb.eBasicTypeUnsignedLongLong) 84 if not(self.sys_params.types_cache.float): 85 self.sys_params.types_cache.float = self.valobj.GetType().GetBasicType(lldb.eBasicTypeFloat) 86 if not(self.sys_params.types_cache.double): 87 self.sys_params.types_cache.double = self.valobj.GetType().GetBasicType(lldb.eBasicTypeDouble) 88 self.update(); 89 90 def update(self): 91 logger = lldb.formatters.Logger.Logger() 92 self.adjust_for_architecture(); 93 94 def value(self): 95 logger = lldb.formatters.Logger.Logger() 96 global statistics 97 # we need to skip the ISA, then the next byte tells us what to read 98 # we then skip one other full pointer worth of data and then fetch the contents 99 # if we are fetching an int64 value, one more pointer must be skipped to get at our data 100 data_type_vo = self.valobj.CreateChildAtOffset("dt", 101 self.sys_params.pointer_size, 102 self.sys_params.types_cache.char) 103 data_type = ((data_type_vo.GetValueAsUnsigned(0) % 256) & 0x1F) 104 data_offset = 2 * self.sys_params.pointer_size 105 if data_type == 0B00001: 106 data_vo = self.valobj.CreateChildAtOffset("data", 107 data_offset, 108 self.sys_params.types_cache.char) 109 statistics.metric_hit('code_notrun',self.valobj) 110 return '(char)' + str(ord(ctypes.c_char(chr(data_vo.GetValueAsUnsigned(0))).value)) 111 elif data_type == 0B0010: 112 data_vo = self.valobj.CreateChildAtOffset("data", 113 data_offset, 114 self.sys_params.types_cache.short) 115 statistics.metric_hit('code_notrun',self.valobj) 116 return '(short)' + str(ctypes.c_short(data_vo.GetValueAsUnsigned(0) % (256*256)).value) 117 # IF tagged pointers are possible on 32bit+v2 runtime 118 # (of which the only existing instance should be iOS) 119 # then values of this type might be tagged 120 elif data_type == 0B0011: 121 data_vo = self.valobj.CreateChildAtOffset("data", 122 data_offset, 123 self.sys_params.types_cache.int) 124 statistics.metric_hit('code_notrun',self.valobj) 125 return '(int)' + str(ctypes.c_int(data_vo.GetValueAsUnsigned(0)% (256*256*256*256)).value) 126 # apparently, on is_64_bit architectures, these are the only values that will ever 127 # be represented by a non tagged pointers 128 elif data_type == 0B10001: 129 data_offset = data_offset + 8 # 8 is needed even if we are on 32bit 130 data_vo = self.valobj.CreateChildAtOffset("data", 131 data_offset, 132 self.sys_params.types_cache.longlong) 133 statistics.metric_hit('code_notrun',self.valobj) 134 return '(long)' + str(ctypes.c_long(data_vo.GetValueAsUnsigned(0)).value) 135 elif data_type == 0B0100: 136 if self.sys_params.is_64_bit: 137 data_offset = data_offset + self.sys_params.pointer_size 138 data_vo = self.valobj.CreateChildAtOffset("data", 139 data_offset, 140 self.sys_params.types_cache.longlong) 141 statistics.metric_hit('code_notrun',self.valobj) 142 return '(long)' + str(ctypes.c_long(data_vo.GetValueAsUnsigned(0)).value) 143 elif data_type == 0B0101: 144 data_vo = self.valobj.CreateChildAtOffset("data", 145 data_offset, 146 self.sys_params.types_cache.longlong) 147 data_plain = int(str(data_vo.GetValueAsUnsigned(0) & 0x00000000FFFFFFFF)) 148 packed = struct.pack('I', data_plain) 149 data_float = struct.unpack('f', packed)[0] 150 statistics.metric_hit('code_notrun',self.valobj) 151 return '(float)' + str(data_float) 152 elif data_type == 0B0110: 153 data_vo = self.valobj.CreateChildAtOffset("data", 154 data_offset, 155 self.sys_params.types_cache.longlong) 156 data_plain = data_vo.GetValueAsUnsigned(0) 157 data_double = struct.unpack('d', struct.pack('Q', data_plain))[0] 158 statistics.metric_hit('code_notrun',self.valobj) 159 return '(double)' + str(data_double) 160 statistics.metric_hit('unknown_class',str(valobj.GetName()) + " had unknown data_type " + str(data_type)) 161 return 'unexpected: dt = ' + str(data_type) 162 163 164 class NSUnknownNumber_SummaryProvider: 165 def adjust_for_architecture(self): 166 pass 167 168 def __init__(self, valobj, params): 169 logger = lldb.formatters.Logger.Logger() 170 self.valobj = valobj; 171 self.sys_params = params 172 self.update(); 173 174 def update(self): 175 logger = lldb.formatters.Logger.Logger() 176 self.adjust_for_architecture(); 177 178 def value(self): 179 logger = lldb.formatters.Logger.Logger() 180 stream = lldb.SBStream() 181 self.valobj.GetExpressionPath(stream) 182 expr = "(NSString*)[" + stream.GetData() + " stringValue]" 183 num_children_vo = self.valobj.CreateValueFromExpression("str",expr) 184 if num_children_vo.IsValid(): 185 return num_children_vo.GetSummary() 186 return '<variable is not NSNumber>' 187 188 def GetSummary_Impl(valobj): 189 logger = lldb.formatters.Logger.Logger() 190 global statistics 191 class_data,wrapper =lldb.runtime.objc.objc_runtime.Utilities.prepare_class_detection(valobj,statistics) 192 if wrapper: 193 return wrapper 194 195 name_string = class_data.class_name() 196 logger >> "class name is: " + str(name_string) 197 198 if name_string == 'NSNumber' or name_string == '__NSCFNumber': 199 if class_data.is_tagged(): 200 wrapper = NSTaggedNumber_SummaryProvider(valobj,class_data.info_bits(),class_data.value(), class_data.sys_params) 201 statistics.metric_hit('code_notrun',valobj) 202 else: 203 # the wrapper might be unable to decipher what is into the NSNumber 204 # and then have to run code on it 205 wrapper = NSUntaggedNumber_SummaryProvider(valobj, class_data.sys_params) 206 else: 207 wrapper = NSUnknownNumber_SummaryProvider(valobj, class_data.sys_params) 208 statistics.metric_hit('unknown_class',valobj.GetName() + " seen as " + name_string) 209 return wrapper; 210 211 212 def NSNumber_SummaryProvider (valobj,dict): 213 logger = lldb.formatters.Logger.Logger() 214 provider = GetSummary_Impl(valobj); 215 if provider != None: 216 if isinstance(provider,lldb.runtime.objc.objc_runtime.SpecialSituation_Description): 217 return provider.message() 218 try: 219 summary = provider.value(); 220 except Exception as foo: 221 print foo 222 # except: 223 summary = None 224 logger >> "got summary " + str(summary) 225 if summary == None: 226 summary = '<variable is not NSNumber>' 227 return str(summary) 228 return 'Summary Unavailable' 229 230 231 def __lldb_init_module(debugger,dict): 232 debugger.HandleCommand("type summary add -F NSNumber.NSNumber_SummaryProvider NSNumber") 233 debugger.HandleCommand("type summary add -F NSNumber.NSNumber_SummaryProvider __NSCFBoolean") 234 debugger.HandleCommand("type summary add -F NSNumber.NSNumber_SummaryProvider __NSCFNumber") 235 236
