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# summary provider for CFBag
import lldb
import ctypes
import objc_runtime
import metrics
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 length for an CFBag, so they need not
# obey the interface specification for synthetic children providers
class CFBagRef_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)
if self.is_64_bit:
self.NSUInteger = self.valobj.GetType().GetBasicType(lldb.eBasicTypeUnsignedLong)
else:
self.NSUInteger = self.valobj.GetType().GetBasicType(lldb.eBasicTypeUnsignedInt)
# 12 bytes on i386
# 20 bytes on x64
# most probably 2 pointers and 4 bytes of data
def offset(self):
if self.is_64_bit:
return 20
else:
return 12
def length(self):
size = self.valobj.CreateChildAtOffset("count",
self.offset(),
self.NSUInteger)
return size.GetValueAsUnsigned(0)
class CFBagUnknown_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 length(self):
stream = lldb.SBStream()
self.valobj.GetExpressionPath(stream)
num_children_vo = self.valobj.CreateValueFromExpression("count","(int)CFBagGetCount(" + stream.GetData() + " )");
return num_children_vo.GetValueAsUnsigned(0)
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()
actual_name = name_string
if name_string == '__NSCFType':
# CFBag does not expose an actual NSWrapper type, so we have to check that this is
# an NSCFType and then check we are a pointer-to __CFBag
valobj_type = valobj.GetType()
if valobj_type.IsValid() and valobj_type.IsPointerType():
pointee_type = valobj_type.GetPointeeType()
actual_name = pointee_type.GetName()
if actual_name == '__CFBag' or \
actual_name == 'const struct __CFBag':
wrapper = CFBagRef_SummaryProvider(valobj)
statistics.metric_hit('code_notrun',valobj)
return wrapper
wrapper = CFBagUnknown_SummaryProvider(valobj)
statistics.metric_hit('unknown_class',str(valobj) + " seen as " + actual_name)
return wrapper;
def CFBag_SummaryProvider (valobj,dict):
provider = GetSummary_Impl(valobj);
if provider != None:
try:
summary = provider.length();
except:
summary = None
# for some reason, one needs to clear some bits for the count
# to be correct when using CF(Mutable)BagRef on x64
# the bit mask was derived through experimentation
# (if counts start looking weird, then most probably
# the mask needs to be changed)
if summary == None:
summary = 'no valid set here'
else:
if provider.is_64_bit:
summary = summary & ~0x1fff000000000000
if summary == 1:
return '1 item'
return str(summary) + " items"
return ''
def __lldb_init_module(debugger,dict):
debugger.HandleCommand("type summary add -F CFBag.CFBag_SummaryProvider CFBagRef CFMutableBagRef")
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