""" LLDB AppKit formatters Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. See https://llvm.org/LICENSE.txt for license information. SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception """ # example summary provider for NSNumber # the real summary is now C++ code built into LLDB import lldb import ctypes import lldb.runtime.objc.objc_runtime import lldb.formatters.metrics import struct import lldb.formatters.Logger statistics = lldb.formatters.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): pass def __init__(self, valobj, info_bits, data, params): logger = lldb.formatters.Logger.Logger() self.valobj = valobj self.sys_params = params self.info_bits = info_bits self.data = data self.update() def update(self): logger = lldb.formatters.Logger.Logger() self.adjust_for_architecture() def value(self): logger = lldb.formatters.Logger.Logger() # 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(ord(ctypes.c_char(chr(self.data % 256)).value)) if self.info_bits == 4: return "(short)" + str(ctypes.c_short(self.data % (256 * 256)).value) if self.info_bits == 8: return "(int)" + str( ctypes.c_int(self.data % (256 * 256 * 256 * 256)).value ) if self.info_bits == 12: return "(long)" + str(ctypes.c_long(self.data).value) else: return ( "unexpected value:(info=" + str(self.info_bits) + ", value = " + str(self.data) + ")" ) class NSUntaggedNumber_SummaryProvider: def adjust_for_architecture(self): pass def __init__(self, valobj, params): logger = lldb.formatters.Logger.Logger() self.valobj = valobj self.sys_params = params if not (self.sys_params.types_cache.char): self.sys_params.types_cache.char = self.valobj.GetType().GetBasicType( lldb.eBasicTypeChar ) if not (self.sys_params.types_cache.short): self.sys_params.types_cache.short = self.valobj.GetType().GetBasicType( lldb.eBasicTypeShort ) if not (self.sys_params.types_cache.ushort): self.sys_params.types_cache.ushort = self.valobj.GetType().GetBasicType( lldb.eBasicTypeUnsignedShort ) if not (self.sys_params.types_cache.int): self.sys_params.types_cache.int = self.valobj.GetType().GetBasicType( lldb.eBasicTypeInt ) if not (self.sys_params.types_cache.long): self.sys_params.types_cache.long = self.valobj.GetType().GetBasicType( lldb.eBasicTypeLong ) if not (self.sys_params.types_cache.ulong): self.sys_params.types_cache.ulong = self.valobj.GetType().GetBasicType( lldb.eBasicTypeUnsignedLong ) if not (self.sys_params.types_cache.longlong): self.sys_params.types_cache.longlong = self.valobj.GetType().GetBasicType( lldb.eBasicTypeLongLong ) if not (self.sys_params.types_cache.ulonglong): self.sys_params.types_cache.ulonglong = self.valobj.GetType().GetBasicType( lldb.eBasicTypeUnsignedLongLong ) if not (self.sys_params.types_cache.float): self.sys_params.types_cache.float = self.valobj.GetType().GetBasicType( lldb.eBasicTypeFloat ) if not (self.sys_params.types_cache.double): self.sys_params.types_cache.double = self.valobj.GetType().GetBasicType( lldb.eBasicTypeDouble ) self.update() def update(self): logger = lldb.formatters.Logger.Logger() self.adjust_for_architecture() def value(self): logger = lldb.formatters.Logger.Logger() 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.sys_params.pointer_size, self.sys_params.types_cache.char ) data_type = (data_type_vo.GetValueAsUnsigned(0) % 256) & 0x1F data_offset = 2 * self.sys_params.pointer_size if data_type == 0b00001: data_vo = self.valobj.CreateChildAtOffset( "data", data_offset, self.sys_params.types_cache.char ) statistics.metric_hit("code_notrun", self.valobj) return "(char)" + str( ord(ctypes.c_char(chr(data_vo.GetValueAsUnsigned(0))).value) ) elif data_type == 0b0010: data_vo = self.valobj.CreateChildAtOffset( "data", data_offset, self.sys_params.types_cache.short ) statistics.metric_hit("code_notrun", self.valobj) return "(short)" + str( ctypes.c_short(data_vo.GetValueAsUnsigned(0) % (256 * 256)).value ) # 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.sys_params.types_cache.int ) statistics.metric_hit("code_notrun", self.valobj) return "(int)" + str( ctypes.c_int( data_vo.GetValueAsUnsigned(0) % (256 * 256 * 256 * 256) ).value ) # 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.sys_params.types_cache.longlong ) statistics.metric_hit("code_notrun", self.valobj) return "(long)" + str(ctypes.c_long(data_vo.GetValueAsUnsigned(0)).value) elif data_type == 0b0100: if self.sys_params.is_64_bit: data_offset = data_offset + self.sys_params.pointer_size data_vo = self.valobj.CreateChildAtOffset( "data", data_offset, self.sys_params.types_cache.longlong ) statistics.metric_hit("code_notrun", self.valobj) return "(long)" + str(ctypes.c_long(data_vo.GetValueAsUnsigned(0)).value) elif data_type == 0b0101: data_vo = self.valobj.CreateChildAtOffset( "data", data_offset, self.sys_params.types_cache.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.sys_params.types_cache.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(valobj.GetName()) + " had unknown data_type " + str(data_type), ) return "unexpected: dt = " + str(data_type) class NSUnknownNumber_SummaryProvider: def adjust_for_architecture(self): pass def __init__(self, valobj, params): logger = lldb.formatters.Logger.Logger() self.valobj = valobj self.sys_params = params self.update() def update(self): logger = lldb.formatters.Logger.Logger() self.adjust_for_architecture() def value(self): logger = lldb.formatters.Logger.Logger() stream = lldb.SBStream() self.valobj.GetExpressionPath(stream) expr = "(NSString*)[" + stream.GetData() + " stringValue]" num_children_vo = self.valobj.CreateValueFromExpression("str", expr) if num_children_vo.IsValid(): return num_children_vo.GetSummary() return "" def GetSummary_Impl(valobj): logger = lldb.formatters.Logger.Logger() global statistics ( class_data, wrapper, ) = lldb.runtime.objc.objc_runtime.Utilities.prepare_class_detection( valobj, statistics ) if wrapper: return wrapper name_string = class_data.class_name() logger >> "class name is: " + str(name_string) if name_string == "NSNumber" or name_string == "__NSCFNumber": if class_data.is_tagged(): wrapper = NSTaggedNumber_SummaryProvider( valobj, class_data.info_bits(), class_data.value(), class_data.sys_params, ) 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, class_data.sys_params) else: wrapper = NSUnknownNumber_SummaryProvider(valobj, class_data.sys_params) statistics.metric_hit( "unknown_class", valobj.GetName() + " seen as " + name_string ) return wrapper def NSNumber_SummaryProvider(valobj, dict): logger = lldb.formatters.Logger.Logger() provider = GetSummary_Impl(valobj) if provider is not None: if isinstance( provider, lldb.runtime.objc.objc_runtime.SpecialSituation_Description ): return provider.message() try: summary = provider.value() except Exception as foo: print(foo) # except: summary = None logger >> "got summary " + str(summary) if summary is None: summary = "" return str(summary) return "Summary Unavailable" def __lldb_init_module(debugger, dict): debugger.HandleCommand( "type summary add -F NSNumber.NSNumber_SummaryProvider NSNumber" ) debugger.HandleCommand( "type summary add -F NSNumber.NSNumber_SummaryProvider __NSCFBoolean" ) debugger.HandleCommand( "type summary add -F NSNumber.NSNumber_SummaryProvider __NSCFNumber" )