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