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"""
LLDB AppKit formatters
part of The LLVM Compiler Infrastructure
This file is distributed under the University of Illinois Open Source
License. See LICENSE.TXT for details.
"""
# example summary provider for NSData
# 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 NSData, so they need not
# obey the interface specification for synthetic children providers
class NSConcreteData_SummaryProvider:
def adjust_for_architecture(self):
pass
def __init__(self, valobj, params):
logger = lldb.formatters.Logger.Logger()
logger >> "NSConcreteData_SummaryProvider __init__"
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):
self.adjust_for_architecture();
# one pointer is the ISA
# then there are 32 bit worth of flags and other data
# however, on 64bit systems these are padded to be a full
# machine word long, which means we actually have two pointers
# worth of data to skip
def offset(self):
return 2 * self.sys_params.pointer_size
def length(self):
logger = lldb.formatters.Logger.Logger()
logger >> "NSConcreteData_SummaryProvider length"
size = self.valobj.CreateChildAtOffset("count",
self.offset(),
self.sys_params.types_cache.NSUInteger)
logger >> str(size)
logger >> str(size.GetValueAsUnsigned(0))
return size.GetValueAsUnsigned(0)
class NSDataUnknown_SummaryProvider:
def adjust_for_architecture(self):
pass
def __init__(self, valobj, params):
logger = lldb.formatters.Logger.Logger()
logger >> "NSDataUnknown_SummaryProvider __init__"
self.valobj = valobj;
self.sys_params = params
self.update();
def update(self):
self.adjust_for_architecture();
def length(self):
logger = lldb.formatters.Logger.Logger()
logger >> "NSDataUnknown_SummaryProvider length"
stream = lldb.SBStream()
self.valobj.GetExpressionPath(stream)
logger >> stream.GetData()
num_children_vo = self.valobj.CreateValueFromExpression("count","(int)[" + stream.GetData() + " length]");
logger >> "still in after expression: " + str(num_children_vo)
if num_children_vo.IsValid():
logger >> "wow - expr output is valid: " + str(num_children_vo.GetValueAsUnsigned())
return num_children_vo.GetValueAsUnsigned(0)
logger >> "invalid expr output - too bad"
return '<variable is not NSData>'
def GetSummary_Impl(valobj):
global statistics
logger = lldb.formatters.Logger.Logger()
logger >> "NSData GetSummary_Impl"
class_data,wrapper =lldb.runtime.objc.objc_runtime.Utilities.prepare_class_detection(valobj,statistics)
if wrapper:
logger >> "got a wrapper summary - using it"
return wrapper
name_string = class_data.class_name()
logger >> "class name: " + name_string
if name_string == 'NSConcreteData' or \
name_string == 'NSConcreteMutableData' or \
name_string == '__NSCFData':
wrapper = NSConcreteData_SummaryProvider(valobj, class_data.sys_params)
statistics.metric_hit('code_notrun',valobj)
else:
wrapper = NSDataUnknown_SummaryProvider(valobj, class_data.sys_params)
statistics.metric_hit('unknown_class',valobj.GetName() + " seen as " + name_string)
return wrapper;
def NSData_SummaryProvider (valobj,dict):
logger = lldb.formatters.Logger.Logger()
logger >> "NSData_SummaryProvider"
provider = GetSummary_Impl(valobj);
logger >> "found a summary provider, it is: " + str(provider)
if provider != None:
try:
summary = provider.length();
except:
summary = None
logger >> "got a summary: it is " + str(summary)
if summary == None:
summary = '<variable is not NSData>'
elif isinstance(summary,basestring):
pass
else:
if summary == 1:
summary = '1 byte'
else:
summary = str(summary) + ' bytes'
return summary
return 'Summary Unavailable'
def NSData_SummaryProvider2 (valobj,dict):
logger = lldb.formatters.Logger.Logger()
logger >> "NSData_SummaryProvider2"
provider = GetSummary_Impl(valobj);
logger >> "found a summary provider, it is: " + str(provider)
if provider != None:
if isinstance(provider,lldb.runtime.objc.objc_runtime.SpecialSituation_Description):
return provider.message()
try:
summary = provider.length();
except:
summary = None
logger >> "got a summary: it is " + str(summary)
if summary == None:
summary = '<variable is not CFData>'
elif isinstance(summary,basestring):
pass
else:
if summary == 1:
summary = '@"1 byte"'
else:
summary = '@"' + str(summary) + ' bytes"'
return summary
return 'Summary Unavailable'
def __lldb_init_module(debugger,dict):
debugger.HandleCommand("type summary add -F NSData.NSData_SummaryProvider NSData")
debugger.HandleCommand("type summary add -F NSData.NSData_SummaryProvider2 CFDataRef CFMutableDataRef")
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