forked from OSchip/llvm-project
226 lines
9.0 KiB
Python
226 lines
9.0 KiB
Python
# summary provider for NSNumber
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import lldb
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import ctypes
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import objc_runtime
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import metrics
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import struct
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statistics = metrics.Metrics()
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statistics.add_metric('invalid_isa')
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statistics.add_metric('invalid_pointer')
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statistics.add_metric('unknown_class')
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statistics.add_metric('code_notrun')
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# despite the similary to synthetic children providers, these classes are not
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# trying to provide anything but the port number of an NSNumber, so they need not
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# obey the interface specification for synthetic children providers
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class NSTaggedNumber_SummaryProvider:
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def adjust_for_architecture(self):
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self.is_64_bit = (self.valobj.GetTarget().GetProcess().GetAddressByteSize() == 8)
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self.is_little = (self.valobj.GetTarget().GetProcess().GetByteOrder() == lldb.eByteOrderLittle)
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self.pointer_size = self.valobj.GetTarget().GetProcess().GetAddressByteSize()
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def __init__(self, valobj, info_bits, data):
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self.valobj = valobj;
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self.update();
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self.info_bits = info_bits
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self.data = data
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def update(self):
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self.adjust_for_architecture();
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self.id_type = self.valobj.GetType().GetBasicType(lldb.eBasicTypeObjCID)
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self.char = self.valobj.GetType().GetBasicType(lldb.eBasicTypeChar)
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self.short = self.valobj.GetType().GetBasicType(lldb.eBasicTypeShort)
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self.ushort = self.valobj.GetType().GetBasicType(lldb.eBasicTypeUnsignedShort)
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self.int = self.valobj.GetType().GetBasicType(lldb.eBasicTypeInt)
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self.long = self.valobj.GetType().GetBasicType(lldb.eBasicTypeLong)
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self.ulong = self.valobj.GetType().GetBasicType(lldb.eBasicTypeUnsignedLong)
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self.longlong = self.valobj.GetType().GetBasicType(lldb.eBasicTypeLongLong)
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self.ulonglong = self.valobj.GetType().GetBasicType(lldb.eBasicTypeUnsignedLongLong)
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self.float = self.valobj.GetType().GetBasicType(lldb.eBasicTypeFloat)
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self.double = self.valobj.GetType().GetBasicType(lldb.eBasicTypeDouble)
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def value(self):
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# in spite of the plenty of types made available by the public NSNumber API
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# only a bunch of these are actually used in the internal implementation
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# unfortunately, the original type information appears to be lost
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# so we try to at least recover the proper magnitude of the data
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if self.info_bits == 0:
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return '(char)' + str(self.data % 256)
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if self.info_bits == 4:
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return '(short)' + str(self.data % (256*256))
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if self.info_bits == 8:
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return '(int)' + str(self.data % (256*256*256*256))
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if self.info_bits == 12:
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return '(long)' + str(self.data)
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else:
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return 'absurd value:(info=' + str(self.info_bits) + ", value = " + str(self.data) + ')'
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class NSUntaggedNumber_SummaryProvider:
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def adjust_for_architecture(self):
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self.is_64_bit = (self.valobj.GetTarget().GetProcess().GetAddressByteSize() == 8)
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self.is_little = (self.valobj.GetTarget().GetProcess().GetByteOrder() == lldb.eByteOrderLittle)
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self.pointer_size = self.valobj.GetTarget().GetProcess().GetAddressByteSize()
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def __init__(self, valobj):
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self.valobj = valobj;
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self.update()
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def update(self):
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self.adjust_for_architecture();
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self.id_type = self.valobj.GetType().GetBasicType(lldb.eBasicTypeObjCID)
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self.char = self.valobj.GetType().GetBasicType(lldb.eBasicTypeChar)
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self.short = self.valobj.GetType().GetBasicType(lldb.eBasicTypeShort)
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self.ushort = self.valobj.GetType().GetBasicType(lldb.eBasicTypeUnsignedShort)
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self.int = self.valobj.GetType().GetBasicType(lldb.eBasicTypeInt)
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self.long = self.valobj.GetType().GetBasicType(lldb.eBasicTypeLong)
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self.ulong = self.valobj.GetType().GetBasicType(lldb.eBasicTypeUnsignedLong)
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self.longlong = self.valobj.GetType().GetBasicType(lldb.eBasicTypeLongLong)
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self.ulonglong = self.valobj.GetType().GetBasicType(lldb.eBasicTypeUnsignedLongLong)
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self.float = self.valobj.GetType().GetBasicType(lldb.eBasicTypeFloat)
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self.double = self.valobj.GetType().GetBasicType(lldb.eBasicTypeDouble)
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def value(self):
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global statistics
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# we need to skip the ISA, then the next byte tells us what to read
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# we then skip one other full pointer worth of data and then fetch the contents
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# if we are fetching an int64 value, one more pointer must be skipped to get at our data
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data_type_vo = self.valobj.CreateChildAtOffset("dt",
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self.pointer_size,
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self.char)
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data_type = ((data_type_vo.GetValueAsUnsigned(0) % 256) & 0x1F)
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data_offset = 2 * self.pointer_size
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if data_type == 0B00001:
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data_vo = self.valobj.CreateChildAtOffset("data",
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data_offset,
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self.char)
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statistics.metric_hit('code_notrun',self.valobj)
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return '(char)' + str(data_vo.GetValueAsUnsigned(0))
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elif data_type == 0B0010:
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data_vo = self.valobj.CreateChildAtOffset("data",
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data_offset,
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self.short)
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statistics.metric_hit('code_notrun',self.valobj)
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return '(short)' + str(data_vo.GetValueAsUnsigned(0) % (256*256))
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# IF tagged pointers are possible on 32bit+v2 runtime
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# (of which the only existing instance should be iOS)
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# then values of this type might be tagged
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elif data_type == 0B0011:
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data_vo = self.valobj.CreateChildAtOffset("data",
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data_offset,
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self.int)
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statistics.metric_hit('code_notrun',self.valobj)
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return '(int)' + str(data_vo.GetValueAsUnsigned(0) % (256*256*256*256))
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# apparently, on is_64_bit architectures, these are the only values that will ever
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# be represented by a non tagged pointers
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elif data_type == 0B10001:
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data_offset = data_offset + 8 # 8 is needed even if we are on 32bit
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data_vo = self.valobj.CreateChildAtOffset("data",
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data_offset,
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self.longlong)
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statistics.metric_hit('code_notrun',self.valobj)
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return '(long)' + str(data_vo.GetValueAsUnsigned(0))
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elif data_type == 0B0100:
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if self.is_64_bit:
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data_offset = data_offset + self.pointer_size
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data_vo = self.valobj.CreateChildAtOffset("data",
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data_offset,
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self.longlong)
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statistics.metric_hit('code_notrun',self.valobj)
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return '(long)' + str(data_vo.GetValueAsUnsigned(0))
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elif data_type == 0B0101:
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data_vo = self.valobj.CreateChildAtOffset("data",
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data_offset,
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self.longlong)
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data_plain = int(str(data_vo.GetValueAsUnsigned(0) & 0x00000000FFFFFFFF))
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packed = struct.pack('I', data_plain)
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data_float = struct.unpack('f', packed)[0]
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statistics.metric_hit('code_notrun',self.valobj)
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return '(float)' + str(data_float)
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elif data_type == 0B0110:
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data_vo = self.valobj.CreateChildAtOffset("data",
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data_offset,
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self.longlong)
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data_plain = data_vo.GetValueAsUnsigned(0)
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data_double = struct.unpack('d', struct.pack('Q', data_plain))[0]
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statistics.metric_hit('code_notrun',self.valobj)
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return '(double)' + str(data_double)
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statistics.metric_hit('unknown_class',str(self.valobj) + " had unknown data_type " + str(data_type))
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return 'absurd: dt = ' + str(data_type)
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class NSUnknownNumber_SummaryProvider:
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def adjust_for_architecture(self):
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self.is_64_bit = (self.valobj.GetTarget().GetProcess().GetAddressByteSize() == 8)
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self.is_little = (self.valobj.GetTarget().GetProcess().GetByteOrder() == lldb.eByteOrderLittle)
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self.pointer_size = self.valobj.GetTarget().GetProcess().GetAddressByteSize()
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def __init__(self, valobj):
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self.valobj = valobj;
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self.update()
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def update(self):
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self.adjust_for_architecture();
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self.id_type = self.valobj.GetType().GetBasicType(lldb.eBasicTypeObjCID)
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def value(self):
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stream = lldb.SBStream()
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self.valobj.GetExpressionPath(stream)
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expr = "(NSString*)[" + stream.GetData() + " stringValue]"
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num_children_vo = self.valobj.CreateValueFromExpression("str",expr);
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return num_children_vo.GetSummary()
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def GetSummary_Impl(valobj):
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global statistics
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class_data = objc_runtime.ObjCRuntime(valobj)
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if class_data.is_valid() == False:
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statistics.metric_hit('invalid_pointer',valobj)
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wrapper = None
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return
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class_data = class_data.read_class_data()
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if class_data.is_valid() == False:
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statistics.metric_hit('invalid_isa',valobj)
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wrapper = None
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return
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if class_data.is_kvo():
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class_data = class_data.get_superclass()
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if class_data.is_valid() == False:
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statistics.metric_hit('invalid_isa',valobj)
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wrapper = None
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return
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name_string = class_data.class_name()
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if name_string == 'NSNumber' or name_string == '__NSCFNumber':
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if class_data.is_tagged():
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wrapper = NSTaggedNumber_SummaryProvider(valobj,class_data.info_bits(),class_data.value())
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statistics.metric_hit('code_notrun',valobj)
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else:
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# the wrapper might be unable to decipher what is into the NSNumber
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# and then have to run code on it
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wrapper = NSUntaggedNumber_SummaryProvider(valobj)
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else:
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wrapper = NSUnknownNumber_SummaryProvider(valobj)
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statistics.metric_hit('unknown_class',str(valobj) + " seen as " + name_string)
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return wrapper;
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def NSNumber_SummaryProvider (valobj,dict):
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provider = GetSummary_Impl(valobj);
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if provider != None:
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#try:
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summary = provider.value();
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#except:
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# summary = None
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if summary == None:
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summary = 'no valid number here'
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return str(summary)
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return ''
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def __lldb_init_module(debugger,dict):
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debugger.HandleCommand("type summary add -F NSNumber.NSNumber_SummaryProvider NSNumber")
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