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273 lines
11 KiB
273 lines
11 KiB
4 months ago
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"""
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LLDB AppKit formatters
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Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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See https://llvm.org/LICENSE.txt for license information.
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SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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"""
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# example summary provider for NSNumber
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# the real summary is now C++ code built into LLDB
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from __future__ import print_function
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import lldb
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import ctypes
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import lldb.runtime.objc.objc_runtime
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import lldb.formatters.metrics
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import struct
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import lldb.formatters.Logger
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statistics = lldb.formatters.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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pass
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def __init__(self, valobj, info_bits, data, params):
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logger = lldb.formatters.Logger.Logger()
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self.valobj = valobj
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self.sys_params = params
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self.info_bits = info_bits
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self.data = data
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self.update()
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def update(self):
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logger = lldb.formatters.Logger.Logger()
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self.adjust_for_architecture()
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def value(self):
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logger = lldb.formatters.Logger.Logger()
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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)' + \
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str(ord(ctypes.c_char(chr(self.data % 256)).value))
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if self.info_bits == 4:
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return '(short)' + \
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str(ctypes.c_short(self.data % (256 * 256)).value)
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if self.info_bits == 8:
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return '(int)' + str(ctypes.c_int(self.data %
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(256 * 256 * 256 * 256)).value)
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if self.info_bits == 12:
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return '(long)' + str(ctypes.c_long(self.data).value)
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else:
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return 'unexpected value:(info=' + str(self.info_bits) + \
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", value = " + str(self.data) + ')'
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class NSUntaggedNumber_SummaryProvider:
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def adjust_for_architecture(self):
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pass
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def __init__(self, valobj, params):
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logger = lldb.formatters.Logger.Logger()
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self.valobj = valobj
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self.sys_params = params
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if not(self.sys_params.types_cache.char):
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self.sys_params.types_cache.char = self.valobj.GetType(
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).GetBasicType(lldb.eBasicTypeChar)
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if not(self.sys_params.types_cache.short):
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self.sys_params.types_cache.short = self.valobj.GetType(
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).GetBasicType(lldb.eBasicTypeShort)
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if not(self.sys_params.types_cache.ushort):
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self.sys_params.types_cache.ushort = self.valobj.GetType(
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).GetBasicType(lldb.eBasicTypeUnsignedShort)
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if not(self.sys_params.types_cache.int):
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self.sys_params.types_cache.int = self.valobj.GetType().GetBasicType(lldb.eBasicTypeInt)
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if not(self.sys_params.types_cache.long):
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self.sys_params.types_cache.long = self.valobj.GetType(
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).GetBasicType(lldb.eBasicTypeLong)
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if not(self.sys_params.types_cache.ulong):
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self.sys_params.types_cache.ulong = self.valobj.GetType(
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).GetBasicType(lldb.eBasicTypeUnsignedLong)
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if not(self.sys_params.types_cache.longlong):
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self.sys_params.types_cache.longlong = self.valobj.GetType(
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).GetBasicType(lldb.eBasicTypeLongLong)
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if not(self.sys_params.types_cache.ulonglong):
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self.sys_params.types_cache.ulonglong = self.valobj.GetType(
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).GetBasicType(lldb.eBasicTypeUnsignedLongLong)
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if not(self.sys_params.types_cache.float):
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self.sys_params.types_cache.float = self.valobj.GetType(
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).GetBasicType(lldb.eBasicTypeFloat)
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if not(self.sys_params.types_cache.double):
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self.sys_params.types_cache.double = self.valobj.GetType(
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).GetBasicType(lldb.eBasicTypeDouble)
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self.update()
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def update(self):
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logger = lldb.formatters.Logger.Logger()
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self.adjust_for_architecture()
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def value(self):
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logger = lldb.formatters.Logger.Logger()
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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
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# to get at our data
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data_type_vo = self.valobj.CreateChildAtOffset(
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"dt", self.sys_params.pointer_size, self.sys_params.types_cache.char)
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data_type = ((data_type_vo.GetValueAsUnsigned(0) % 256) & 0x1F)
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data_offset = 2 * self.sys_params.pointer_size
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if data_type == 0B00001:
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data_vo = self.valobj.CreateChildAtOffset(
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"data", data_offset, self.sys_params.types_cache.char)
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statistics.metric_hit('code_notrun', self.valobj)
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return '(char)' + \
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str(ord(ctypes.c_char(chr(data_vo.GetValueAsUnsigned(0))).value))
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elif data_type == 0B0010:
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data_vo = self.valobj.CreateChildAtOffset(
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"data", data_offset, self.sys_params.types_cache.short)
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statistics.metric_hit('code_notrun', self.valobj)
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return '(short)' + str(
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ctypes.c_short(
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data_vo.GetValueAsUnsigned(0) %
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(256 * 256)).value)
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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(
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"data", data_offset, self.sys_params.types_cache.int)
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statistics.metric_hit('code_notrun', self.valobj)
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return '(int)' + str(ctypes.c_int(data_vo.GetValueAsUnsigned(0) %
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(256 * 256 * 256 * 256)).value)
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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(
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"data", data_offset, self.sys_params.types_cache.longlong)
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statistics.metric_hit('code_notrun', self.valobj)
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return '(long)' + \
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str(ctypes.c_long(data_vo.GetValueAsUnsigned(0)).value)
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elif data_type == 0B0100:
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if self.sys_params.is_64_bit:
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data_offset = data_offset + self.sys_params.pointer_size
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data_vo = self.valobj.CreateChildAtOffset(
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"data", data_offset, self.sys_params.types_cache.longlong)
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statistics.metric_hit('code_notrun', self.valobj)
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return '(long)' + \
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str(ctypes.c_long(data_vo.GetValueAsUnsigned(0)).value)
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elif data_type == 0B0101:
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data_vo = self.valobj.CreateChildAtOffset(
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"data", data_offset, self.sys_params.types_cache.longlong)
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data_plain = int(
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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(
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"data", data_offset, self.sys_params.types_cache.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(
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'unknown_class', str(
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valobj.GetName()) + " had unknown data_type " + str(data_type))
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return 'unexpected: dt = ' + str(data_type)
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class NSUnknownNumber_SummaryProvider:
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def adjust_for_architecture(self):
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pass
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def __init__(self, valobj, params):
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logger = lldb.formatters.Logger.Logger()
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self.valobj = valobj
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self.sys_params = params
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self.update()
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def update(self):
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logger = lldb.formatters.Logger.Logger()
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self.adjust_for_architecture()
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def value(self):
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logger = lldb.formatters.Logger.Logger()
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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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if num_children_vo.IsValid():
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return num_children_vo.GetSummary()
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return '<variable is not NSNumber>'
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def GetSummary_Impl(valobj):
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logger = lldb.formatters.Logger.Logger()
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global statistics
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class_data, wrapper = lldb.runtime.objc.objc_runtime.Utilities.prepare_class_detection(
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valobj, statistics)
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if wrapper:
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return wrapper
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name_string = class_data.class_name()
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logger >> "class name is: " + str(name_string)
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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(
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valobj, class_data.info_bits(), class_data.value(), class_data.sys_params)
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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(
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valobj, class_data.sys_params)
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else:
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wrapper = NSUnknownNumber_SummaryProvider(
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valobj, class_data.sys_params)
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statistics.metric_hit(
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'unknown_class',
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valobj.GetName() +
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" seen as " +
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name_string)
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return wrapper
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def NSNumber_SummaryProvider(valobj, dict):
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logger = lldb.formatters.Logger.Logger()
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provider = GetSummary_Impl(valobj)
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if provider is not None:
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if isinstance(
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provider,
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lldb.runtime.objc.objc_runtime.SpecialSituation_Description):
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return provider.message()
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try:
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summary = provider.value()
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except Exception as foo:
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print(foo)
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# except:
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summary = None
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logger >> "got summary " + str(summary)
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if summary is None:
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summary = '<variable is not NSNumber>'
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return str(summary)
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return 'Summary Unavailable'
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def __lldb_init_module(debugger, dict):
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debugger.HandleCommand(
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"type summary add -F NSNumber.NSNumber_SummaryProvider NSNumber")
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debugger.HandleCommand(
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"type summary add -F NSNumber.NSNumber_SummaryProvider __NSCFBoolean")
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debugger.HandleCommand(
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"type summary add -F NSNumber.NSNumber_SummaryProvider __NSCFNumber")
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