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"""
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 CFBag
# 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 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 length for an CFBag, so they need not
# obey the interface specification for synthetic children providers
class CFBagRef_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.NSUInteger):
if self.sys_params.is_64_bit:
self.sys_params.types_cache.NSUInteger = self.valobj.GetType(
).GetBasicType(lldb.eBasicTypeUnsignedLong)
else:
self.sys_params.types_cache.NSUInteger = self.valobj.GetType(
).GetBasicType(lldb.eBasicTypeUnsignedInt)
self.update()
def update(self):
logger = lldb.formatters.Logger.Logger()
self.adjust_for_architecture()
# 12 bytes on i386
# 20 bytes on x64
# most probably 2 pointers and 4 bytes of data
def offset(self):
logger = lldb.formatters.Logger.Logger()
if self.sys_params.is_64_bit:
return 20
else:
return 12
def length(self):
logger = lldb.formatters.Logger.Logger()
size = self.valobj.CreateChildAtOffset(
"count", self.offset(), self.sys_params.types_cache.NSUInteger)
return size.GetValueAsUnsigned(0)
class CFBagUnknown_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 length(self):
logger = lldb.formatters.Logger.Logger()
stream = lldb.SBStream()
self.valobj.GetExpressionPath(stream)
num_children_vo = self.valobj.CreateValueFromExpression(
"count", "(int)CFBagGetCount(" + stream.GetData() + " )")
if num_children_vo.IsValid():
return num_children_vo.GetValueAsUnsigned(0)
return "<variable is not CFBag>"
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()
actual_name = name_string
logger >> "name string got was " + \
str(name_string) + " but actual name is " + str(actual_name)
if class_data.is_cftype():
# 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():
valobj_type = valobj_type.GetPointeeType()
if valobj_type.IsValid():
actual_name = valobj_type.GetName()
if actual_name == '__CFBag' or \
actual_name == 'const struct __CFBag':
wrapper = CFBagRef_SummaryProvider(valobj, class_data.sys_params)
statistics.metric_hit('code_notrun', valobj)
return wrapper
wrapper = CFBagUnknown_SummaryProvider(valobj, class_data.sys_params)
statistics.metric_hit(
'unknown_class',
valobj.GetName() +
" seen as " +
actual_name)
return wrapper
def CFBag_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.length()
except:
summary = None
logger >> "summary got from provider: " + str(summary)
# 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 is None:
summary = '<variable is not CFBag>'
elif isinstance(summary, basestring):
pass
else:
if provider.sys_params.is_64_bit:
summary = summary & ~0x1fff000000000000
if summary == 1:
summary = '@"1 value"'
else:
summary = '@"' + str(summary) + ' values"'
return summary
return 'Summary Unavailable'
def __lldb_init_module(debugger, dict):
debugger.HandleCommand(
"type summary add -F CFBag.CFBag_SummaryProvider CFBagRef CFMutableBagRef")
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