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