lldb/examples/summaries/cocoa/NSException.py

"""
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.
"""
# summary provider for class NSException
import lldb.runtime.objc.objc_runtime
import lldb.formatters.metrics
import CFString
import lldb
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')


class NSKnownException_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.id):
            self.sys_params.types_cache.id = self.valobj.GetType(
            ).GetBasicType(lldb.eBasicTypeObjCID)
        self.update()

    def update(self):
        logger = lldb.formatters.Logger.Logger()
        self.adjust_for_architecture()

    def offset_name(self):
        logger = lldb.formatters.Logger.Logger()
        return self.sys_params.pointer_size

    def offset_reason(self):
        logger = lldb.formatters.Logger.Logger()
        return 2 * self.sys_params.pointer_size

    def description(self):
        logger = lldb.formatters.Logger.Logger()
        name_ptr = self.valobj.CreateChildAtOffset(
            "name", self.offset_name(), self.sys_params.types_cache.id)
        reason_ptr = self.valobj.CreateChildAtOffset(
            "reason", self.offset_reason(), self.sys_params.types_cache.id)
        return 'name:' + CFString.CFString_SummaryProvider(
            name_ptr, None) + ' reason:' + CFString.CFString_SummaryProvider(reason_ptr, None)


class NSUnknownException_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 description(self):
        logger = lldb.formatters.Logger.Logger()
        stream = lldb.SBStream()
        self.valobj.GetExpressionPath(stream)
        name_vo = self.valobj.CreateValueFromExpression(
            "name", "(NSString*)[" + stream.GetData() + " name]")
        reason_vo = self.valobj.CreateValueFromExpression(
            "reason", "(NSString*)[" + stream.GetData() + " reason]")
        if name_vo.IsValid() and reason_vo.IsValid():
            return CFString.CFString_SummaryProvider(
                name_vo, None) + ' ' + CFString.CFString_SummaryProvider(reason_vo, None)
        return '<variable is not NSException>'


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 == 'NSException':
        wrapper = NSKnownException_SummaryProvider(
            valobj, class_data.sys_params)
        statistics.metric_hit('code_notrun', valobj)
    else:
        wrapper = NSUnknownException_SummaryProvider(
            valobj, class_data.sys_params)
        statistics.metric_hit(
            'unknown_class',
            valobj.GetName() +
            " seen as " +
            name_string)
    return wrapper


def NSException_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.description()
        except:
            summary = None
        logger >> "got summary " + str(summary)
        if summary is None:
            summary = '<variable is not NSException>'
        return str(summary)
    return 'Summary Unavailable'


def __lldb_init_module(debugger, dict):
    debugger.HandleCommand(
        "type summary add -F NSException.NSException_SummaryProvider NSException")