reference, declarationdefinition
definition → references, declarations, derived classes, virtual overrides
reference to multiple definitions → definitions
unreferenced
    1
    2
    3
    4
    5
    6
    7
    8
    9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
  100
  101
  102
  103
  104
  105
  106
  107
  108
  109
  110
  111
  112
  113
  114
  115
  116
  117
  118
  119
  120
  121
  122
  123
  124
  125
  126
  127
  128
  129
  130
  131
  132
  133
  134
  135
  136
  137
  138
  139
  140
  141
  142
  143
  144
  145
  146
  147
  148
  149
  150
  151
  152
  153
  154
  155
  156
  157
  158
  159
  160
  161
  162
  163
  164
  165
  166
  167
  168
  169
  170
  171
  172
  173
  174
  175
  176
  177
  178
  179
  180
  181
  182
  183
  184
  185
  186
  187
"""
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 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

try:
    basestring
except NameError:
    basestring = str

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 is not None:
        try:
            summary = provider.length()
        except:
            summary = None
        logger >> "got a summary: it is " + str(summary)
        if summary is 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 is not 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 is 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")