gdbbridge.py 71.9 KB
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import binascii
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try:
    import __builtin__
except:
    import builtins
try:
    import gdb
except:
    pass

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import inspect
import os
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import os.path
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import sys
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import tempfile
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import traceback
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import struct

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def warn(message):
    print("XXX: %s\n" % message.encode("latin1"))
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from dumper import *
from qttypes import *
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from stdtypes import *
from misctypes import *
from boosttypes import *
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from creatortypes import *
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#######################################################################
#
# Infrastructure
#
#######################################################################

def savePrint(output):
    try:
        print(output)
    except:
        out = ""
        for c in output:
            cc = ord(c)
            if cc > 127:
                out += "\\\\%d" % cc
            elif cc < 0:
                out += "\\\\%d" % (cc + 256)
            else:
                out += c
        print(out)

def registerCommand(name, func):

    class Command(gdb.Command):
        def __init__(self):
            super(Command, self).__init__(name, gdb.COMMAND_OBSCURE)
        def invoke(self, args, from_tty):
            savePrint(func(args))

    Command()

def parseAndEvaluate(exp):
    return gdb.parse_and_eval(exp)

def listOfLocals(varList):
    frame = gdb.selected_frame()

    try:
        block = frame.block()
        #warn("BLOCK: %s " % block)
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    except RuntimeError as error:
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        #warn("BLOCK IN FRAME NOT ACCESSIBLE: %s" % error)
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        return []
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    except:
        warn("BLOCK NOT ACCESSIBLE FOR UNKNOWN REASONS")
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        return []
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    items = []
    shadowed = {}
    while True:
        if block is None:
            warn("UNEXPECTED 'None' BLOCK")
            break
        for symbol in block:
            name = symbol.print_name

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            if name == "__in_chrg" or name == "__PRETTY_FUNCTION__":
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                continue

            # "NotImplementedError: Symbol type not yet supported in
            # Python scripts."
            #warn("SYMBOL %s  (%s): " % (symbol, name))
            if name in shadowed:
                level = shadowed[name]
                name1 = "%s@%s" % (name, level)
                shadowed[name] = level + 1
            else:
                name1 = name
                shadowed[name] = 1
            #warn("SYMBOL %s  (%s, %s)): " % (symbol, name, symbol.name))
            item = LocalItem()
            item.iname = "local." + name1
            item.name = name1
            try:
                item.value = frame.read_var(name, block)
                #warn("READ 1: %s" % item.value)
                if not item.value.is_optimized_out:
                    #warn("ITEM 1: %s" % item.value)
                    items.append(item)
                    continue
            except:
                pass

            try:
                item.value = frame.read_var(name)
                #warn("READ 2: %s" % item.value)
                if not item.value.is_optimized_out:
                    #warn("ITEM 2: %s" % item.value)
                    items.append(item)
                    continue
            except:
                # RuntimeError: happens for
                #     void foo() { std::string s; std::wstring w; }
                # ValueError: happens for (as of 2010/11/4)
                #     a local struct as found e.g. in
                #     gcc sources in gcc.c, int execute()
                pass

            try:
                #warn("READ 3: %s %s" % (name, item.value))
                item.value = gdb.parse_and_eval(name)
                #warn("ITEM 3: %s" % item.value)
                items.append(item)
            except:
                # Can happen in inlined code (see last line of
                # RowPainter::paintChars(): "RuntimeError:
                # No symbol \"__val\" in current context.\n"
                pass

        # The outermost block in a function has the function member
        # FIXME: check whether this is guaranteed.
        if not block.function is None:
            break

        block = block.superblock

    return items


def catchCliOutput(command):
    try:
        return gdb.execute(command, to_string=True).split("\n")
    except:
        pass
    filename = createTempFile()
    gdb.execute("set logging off")
#        gdb.execute("set logging redirect off")
    gdb.execute("set logging file %s" % filename)
#        gdb.execute("set logging redirect on")
    gdb.execute("set logging on")
    msg = ""
    try:
        gdb.execute(command)
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    except RuntimeError as error:
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        # For the first phase of core file loading this yield
        # "No symbol table is loaded.  Use the \"file\" command."
        msg = str(error)
    except:
        msg = "Unknown error"
    gdb.execute("set logging off")
#        gdb.execute("set logging redirect off")
    if len(msg):
        # Having that might confuse result handlers in the gdbengine.
        #warn("CLI ERROR: %s " % msg)
        removeTempFile(filename)
        return "CLI ERROR: %s " % msg
    temp = open(filename, "r")
    lines = []
    for line in temp:
        lines.append(line)
    temp.close()
    removeTempFile(filename)
    return lines


#######################################################################
#
# Types
#
#######################################################################

PointerCode = gdb.TYPE_CODE_PTR
ArrayCode = gdb.TYPE_CODE_ARRAY
StructCode = gdb.TYPE_CODE_STRUCT
UnionCode = gdb.TYPE_CODE_UNION
EnumCode = gdb.TYPE_CODE_ENUM
FlagsCode = gdb.TYPE_CODE_FLAGS
FunctionCode = gdb.TYPE_CODE_FUNC
IntCode = gdb.TYPE_CODE_INT
FloatCode = gdb.TYPE_CODE_FLT # Parts of GDB assume that this means complex.
VoidCode = gdb.TYPE_CODE_VOID
#SetCode = gdb.TYPE_CODE_SET
RangeCode = gdb.TYPE_CODE_RANGE
StringCode = gdb.TYPE_CODE_STRING
#BitStringCode = gdb.TYPE_CODE_BITSTRING
#ErrorTypeCode = gdb.TYPE_CODE_ERROR
MethodCode = gdb.TYPE_CODE_METHOD
MethodPointerCode = gdb.TYPE_CODE_METHODPTR
MemberPointerCode = gdb.TYPE_CODE_MEMBERPTR
ReferenceCode = gdb.TYPE_CODE_REF
CharCode = gdb.TYPE_CODE_CHAR
BoolCode = gdb.TYPE_CODE_BOOL
ComplexCode = gdb.TYPE_CODE_COMPLEX
TypedefCode = gdb.TYPE_CODE_TYPEDEF
NamespaceCode = gdb.TYPE_CODE_NAMESPACE
#Code = gdb.TYPE_CODE_DECFLOAT # Decimal floating point.
#Code = gdb.TYPE_CODE_MODULE # Fortran
#Code = gdb.TYPE_CODE_INTERNAL_FUNCTION


#######################################################################
#
# Step Command
#
#######################################################################

def sal(args):
    (cmd, addr) = args.split(",")
    lines = catchCliOutput("info line *" + addr)
    fromAddr = "0x0"
    toAddr = "0x0"
    for line in lines:
        pos0from = line.find(" starts at address") + 19
        pos1from = line.find(" ", pos0from)
        pos0to = line.find(" ends at", pos1from) + 9
        pos1to = line.find(" ", pos0to)
        if pos1to > 0:
            fromAddr = line[pos0from : pos1from]
            toAddr = line[pos0to : pos1to]
    gdb.execute("maint packet sal%s,%s,%s" % (cmd,fromAddr, toAddr))

registerCommand("sal", sal)


#######################################################################
#
# Convenience
#
#######################################################################

# Just convienience for 'python print ...'
class PPCommand(gdb.Command):
    def __init__(self):
        super(PPCommand, self).__init__("pp", gdb.COMMAND_OBSCURE)
    def invoke(self, args, from_tty):
        print(eval(args))

PPCommand()

# Just convienience for 'python print gdb.parse_and_eval(...)'
class PPPCommand(gdb.Command):
    def __init__(self):
        super(PPPCommand, self).__init__("ppp", gdb.COMMAND_OBSCURE)
    def invoke(self, args, from_tty):
        print(gdb.parse_and_eval(args))

PPPCommand()


def scanStack(p, n):
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    p = int(p)
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    r = []
    for i in xrange(n):
        f = gdb.parse_and_eval("{void*}%s" % p)
        m = gdb.execute("info symbol %s" % f, to_string=True)
        if not m.startswith("No symbol matches"):
            r.append(m)
        p += f.type.sizeof
    return r

class ScanStackCommand(gdb.Command):
    def __init__(self):
        super(ScanStackCommand, self).__init__("scanStack", gdb.COMMAND_OBSCURE)
    def invoke(self, args, from_tty):
        if len(args) == 0:
            args = 20
        savePrint(scanStack(gdb.parse_and_eval("$sp"), int(args)))

ScanStackCommand()

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def bbsetup(args = ''):
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    print(theDumper.bbsetup())
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registerCommand("bbsetup", bbsetup)


#######################################################################
#
# Import plain gdb pretty printers
#
#######################################################################

class PlainDumper:
    def __init__(self, printer):
        self.printer = printer

    def __call__(self, d, value):
        printer = self.printer.gen_printer(value)
        lister = getattr(printer, "children", None)
        children = [] if lister is None else list(lister())
        d.putType(self.printer.name)
        val = printer.to_string().encode("hex")
        d.putValue(val, Hex2EncodedLatin1)
        d.putValue(printer.to_string())
        d.putNumChild(len(children))
        if d.isExpanded():
            with Children(d):
                for child in children:
                    d.putSubItem(child[0], child[1])

def importPlainDumpers(args):
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    theDumper.importPlainDumpers()
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registerCommand("importPlainDumpers", importPlainDumpers)


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#gdb.Value.child = impl_Value_child

# Fails on SimulatorQt.
tempFileCounter = 0
try:
    # Test if 2.6 is used (Windows), trigger exception and default
    # to 2nd version.
    file = tempfile.NamedTemporaryFile(prefix="py_",delete=True)
    file.close()
    def createTempFile():
        file = tempfile.NamedTemporaryFile(prefix="py_",delete=True)
        file.close()
        return file.name

except:
    def createTempFile():
        global tempFileCounter
        tempFileCounter += 1
        fileName = "%s/py_tmp_%d_%d" \
            % (tempfile.gettempdir(), os.getpid(), tempFileCounter)
        return fileName

def removeTempFile(name):
    try:
        os.remove(name)
    except:
        pass



class OutputSafer:
    def __init__(self, d):
        self.d = d

    def __enter__(self):
        self.savedOutput = self.d.output
        self.d.output = []

    def __exit__(self, exType, exValue, exTraceBack):
        if self.d.passExceptions and not exType is None:
            showException("OUTPUTSAFER", exType, exValue, exTraceBack)
            self.d.output = self.savedOutput
        else:
            self.savedOutput.extend(self.d.output)
            self.d.output = self.savedOutput
        return False



def value(expr):
    value = parseAndEvaluate(expr)
    try:
        return int(value)
    except:
        return str(value)


#def couldBePointer(p, align):
#    type = lookupType("unsigned int")
#    ptr = gdb.Value(p).cast(type)
#    d = int(str(ptr))
#    warn("CHECKING : %s %d " % (p, ((d & 3) == 0 and (d > 1000 or d == 0))))
#    return (d & (align - 1)) and (d > 1000 or d == 0)


Value = gdb.Value



def stripTypedefs(type):
    type = type.unqualified()
    while type.code == TypedefCode:
        type = type.strip_typedefs().unqualified()
    return type


#######################################################################
#
# LocalItem
#
#######################################################################

# Contains iname, name, and value.
class LocalItem:
    pass


#######################################################################
#
# Edit Command
#
#######################################################################

def bbedit(args):
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    theDumper.bbedit(args.split(","))
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registerCommand("bbedit", bbedit)


#######################################################################
#
# Frame Command
#
#######################################################################

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def bb(args):
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    print(theDumper.run(args))
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registerCommand("bb", bb)
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#######################################################################
#
# The Dumper Class
#
#######################################################################


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class Dumper(DumperBase):

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    def __init__(self):
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        DumperBase.__init__(self)

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        # These values will be kept between calls to 'run'.
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        self.isGdb = True
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        self.childEventAddress = None
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        self.typesReported = {}
        self.typesToReport = {}
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    def run(self, args):
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        self.output = []
        self.currentIName = ""
        self.currentPrintsAddress = True
        self.currentChildType = ""
        self.currentChildNumChild = -1
        self.currentMaxNumChild = -1
        self.currentNumChild = -1
        self.currentValue = None
        self.currentValuePriority = -100
        self.currentValueEncoding = None
        self.currentType = None
        self.currentTypePriority = -100
        self.currentAddress = None
        self.typeformats = {}
        self.formats = {}
        self.useDynamicType = True
        self.expandedINames = {}

        watchers = ""
        resultVarName = ""
        options = []
        varList = []

        self.output.append('data=[')
        for arg in args.split(' '):
            pos = arg.find(":") + 1
            if arg.startswith("options:"):
                options = arg[pos:].split(",")
            elif arg.startswith("vars:"):
                if len(arg[pos:]) > 0:
                    varList = arg[pos:].split(",")
            elif arg.startswith("resultvarname:"):
                resultVarName = arg[pos:]
            elif arg.startswith("expanded:"):
                self.expandedINames = set(arg[pos:].split(","))
            elif arg.startswith("typeformats:"):
                for f in arg[pos:].split(","):
                    pos = f.find("=")
                    if pos != -1:
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                        type = b16decode(f[0:pos])
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                        self.typeformats[type] = int(f[pos+1:])
            elif arg.startswith("formats:"):
                for f in arg[pos:].split(","):
                    pos = f.find("=")
                    if pos != -1:
                        self.formats[f[0:pos]] = int(f[pos+1:])
            elif arg.startswith("watchers:"):
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                watchers = b16decode(arg[pos:])
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        self.useDynamicType = "dyntype" in options
        self.useFancy = "fancy" in options
        self.passExceptions = "pe" in options
        #self.passExceptions = True
        self.autoDerefPointers = "autoderef" in options
        self.partialUpdate = "partial" in options
        self.tooltipOnly = "tooltiponly" in options
        self.noLocals = "nolocals" in options
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        #warn("NAMESPACE: '%s'" % self.qtNamespace())
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        #warn("VARIABLES: %s" % varList)
        #warn("EXPANDED INAMES: %s" % self.expandedINames)
        #warn("WATCHERS: %s" % watchers)
        #warn("PARTIAL: %s" % self.partialUpdate)
        #warn("NO LOCALS: %s" % self.noLocals)
        module = sys.modules[__name__]

        #
        # Locals
        #
        locals = []
        fullUpdateNeeded = True
        if self.partialUpdate and len(varList) == 1 and not self.tooltipOnly:
            #warn("PARTIAL: %s" % varList)
            parts = varList[0].split('.')
            #warn("PARTIAL PARTS: %s" % parts)
            name = parts[1]
            #warn("PARTIAL VAR: %s" % name)
            #fullUpdateNeeded = False
            try:
                frame = gdb.selected_frame()
                item = LocalItem()
                item.iname = "local." + name
                item.name = name
                item.value = frame.read_var(name)
                locals = [item]
                #warn("PARTIAL LOCALS: %s" % locals)
                fullUpdateNeeded = False
            except:
                pass
            varList = []

        if fullUpdateNeeded and not self.tooltipOnly and not self.noLocals:
            locals = listOfLocals(varList)

        # Take care of the return value of the last function call.
        if len(resultVarName) > 0:
            try:
                item = LocalItem()
                item.name = resultVarName
                item.iname = "return." + resultVarName
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                item.value = self.parseAndEvaluate(resultVarName)
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                locals.append(item)
            except:
                # Don't bother. It's only supplementary information anyway.
                pass

        for item in locals:
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            value = self.downcast(item.value) if self.useDynamicType else item.value
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            with OutputSafer(self):
                self.anonNumber = -1

                type = value.type.unqualified()
                typeName = str(type)

                # Special handling for char** argv.
                if type.code == PointerCode \
                        and item.iname == "local.argv" \
                        and typeName == "char **":
                    n = 0
                    p = value
                    # p is 0 for "optimized out" cases. Or contains rubbish.
                    try:
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                        if not self.isNull(p):
                            while not self.isNull(p.dereference()) and n <= 100:
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                                p += 1
                                n += 1
                    except:
                        pass

                    with TopLevelItem(self, item.iname):
                        self.put('iname="local.argv",name="argv",')
                        self.putItemCount(n, 100)
                        self.putType(typeName)
                        self.putNumChild(n)
                        if self.currentIName in self.expandedINames:
                            p = value
                            with Children(self, n):
                                for i in xrange(n):
                                    self.putSubItem(i, p.dereference())
                                    p += 1
                    continue

                else:
                    # A "normal" local variable or parameter.
                    with TopLevelItem(self, item.iname):
                        self.put('iname="%s",' % item.iname)
                        self.put('name="%s",' % item.name)
                        self.putItem(value)

        #
        # Watchers
        #
        with OutputSafer(self):
            if len(watchers) > 0:
                self.put(",")
                for watcher in watchers.split("##"):
                    (exp, iname) = watcher.split("#")
                    self.handleWatch(exp, iname)

        #print('data=[' + locals + sep + watchers + ']\n')

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        self.output.append('],typeinfo=[')
        for name in self.typesToReport.keys():
            type = self.typesToReport[name]
            # Happens e.g. for '(anonymous namespace)::InsertDefOperation'
            if not type is None:
                self.output.append('{name="%s",size="%s"}'
                    % (b64encode(name), type.sizeof))
        self.output.append(']')
        self.typesToReport = {}
        return "".join(self.output)
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    def enterSubItem(self, item):
        if not item.iname:
            item.iname = "%s.%s" % (self.currentIName, item.name)
        #warn("INAME %s" % item.iname)
        self.put('{')
        #if not item.name is None:
        if isinstance(item.name, str):
            self.put('name="%s",' % item.name)
        item.savedIName = self.currentIName
        item.savedValue = self.currentValue
        item.savedValuePriority = self.currentValuePriority
        item.savedValueEncoding = self.currentValueEncoding
        item.savedType = self.currentType
        item.savedTypePriority = self.currentTypePriority
        item.savedCurrentAddress = self.currentAddress
        self.currentIName = item.iname
        self.currentValuePriority = -100
        self.currentValueEncoding = None
        self.currentType = ""
        self.currentTypePriority = -100
        self.currentAddress = None

    def exitSubItem(self, item, exType, exValue, exTraceBack):
        #warn(" CURRENT VALUE: %s %s %s" % (self.currentValue,
        #    self.currentValueEncoding, self.currentValuePriority))
        if not exType is None:
            if self.passExceptions:
                showException("SUBITEM", exType, exValue, exTraceBack)
            self.putNumChild(0)
            self.putValue("<not accessible>")
        try:
            #warn("TYPE VALUE: %s" % self.currentValue)
            typeName = stripClassTag(self.currentType)
            #warn("TYPE: '%s'  DEFAULT: '%s' % (typeName, self.currentChildType))

            if len(typeName) > 0 and typeName != self.currentChildType:
                self.put('type="%s",' % typeName) # str(type.unqualified()) ?
            if  self.currentValue is None:
                self.put('value="<not accessible>",numchild="0",')
            else:
                if not self.currentValueEncoding is None:
                    self.put('valueencoded="%d",' % self.currentValueEncoding)
                self.put('value="%s",' % self.currentValue)
        except:
            pass
        if not self.currentAddress is None:
            self.put(self.currentAddress)
        self.put('},')
        self.currentIName = item.savedIName
        self.currentValue = item.savedValue
        self.currentValuePriority = item.savedValuePriority
        self.currentValueEncoding = item.savedValueEncoding
        self.currentType = item.savedType
        self.currentTypePriority = item.savedTypePriority
        self.currentAddress = item.savedCurrentAddress
        return True

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    def parseAndEvaluate(self, exp):
        return gdb.parse_and_eval(exp)

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    def call2(self, value, func, args):
        # args is a tuple.
        arg = ""
        for i in range(len(args)):
            if i:
                arg += ','
            a = args[i]
            if (':' in a) and not ("'" in a):
                arg = "'%s'" % a
            else:
                arg += a

        #warn("CALL: %s -> %s(%s)" % (value, func, arg))
        type = stripClassTag(str(value.type))
        if type.find(":") >= 0:
            type = "'" + type + "'"
        # 'class' is needed, see http://sourceware.org/bugzilla/show_bug.cgi?id=11912
        exp = "((class %s*)%s)->%s(%s)" % (type, value.address, func, arg)
        #warn("CALL: %s" % exp)
        result = None
        try:
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            result = gdb.parse_and_eval(exp)
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        except:
            pass
        #warn("  -> %s" % result)
        return result

    def call(self, value, func, *args):
        return self.call2(value, func, args)

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    def makeValue(self, type, init):
        type = "::" + stripClassTag(str(type));
        # Avoid malloc symbol clash with QVector.
        gdb.execute("set $d = (%s*)calloc(sizeof(%s), 1)" % (type, type))
        gdb.execute("set *$d = {%s}" % init)
        value = parseAndEvaluate("$d").dereference()
        #warn("  TYPE: %s" % value.type)
        #warn("  ADDR: %s" % value.address)
        #warn("  VALUE: %s" % value)
        return value

    def makeExpression(self, value):
        type = "::" + stripClassTag(str(value.type))
        #warn("  TYPE: %s" % type)
        #exp = "(*(%s*)(&%s))" % (type, value.address)
        exp = "(*(%s*)(%s))" % (type, value.address)
        #warn("  EXP: %s" % exp)
        return exp

    def makeStdString(init):
        # Works only for small allocators, but they are usually empty.
        gdb.execute("set $d=(std::string*)calloc(sizeof(std::string), 2)");
        gdb.execute("call($d->basic_string(\"" + init +
            "\",*(std::allocator<char>*)(1+$d)))")
        value = parseAndEvaluate("$d").dereference()
        #warn("  TYPE: %s" % value.type)
        #warn("  ADDR: %s" % value.address)
        #warn("  VALUE: %s" % value)
        return value

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    def childAt(self, value, index):
        field = value.type.fields()[index]
        if len(field.name):
            return value[field.name]
        # FIXME: Cheat. There seems to be no official way to access
        # the real item, so we pass back the value. That at least
        # enables later ...["name"] style accesses as gdb handles
        # them transparently.
        return value

    def fieldAt(self, type, index):
        return type.fields()[index]

    def directBaseClass(self, typeobj, index = 0):
        # FIXME: Check it's really a base.
        return typeobj.fields()[index]

    def checkPointer(self, p, align = 1):
        if not self.isNull(p):
            p.dereference()

    def pointerValue(self, p):
        return toInteger(p)

    def isNull(self, p):
        # The following can cause evaluation to abort with "UnicodeEncodeError"
        # for invalid char *, as their "contents" is being examined
        #s = str(p)
        #return s == "0x0" or s.startswith("0x0 ")
        #try:
        #    # Can fail with: "RuntimeError: Cannot access memory at address 0x5"
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        #    return p.cast(self.lookupType("void").pointer()) == 0
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        #except:
        #    return False
        try:
            # Can fail with: "RuntimeError: Cannot access memory at address 0x5"
            return toInteger(p) == 0
        except:
            return False

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    def templateArgument(self, typeobj, position):
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        try:
            # This fails on stock 7.2 with
            # "RuntimeError: No type named myns::QObject.\n"
            return typeobj.template_argument(position)
        except:
            # That's something like "myns::QList<...>"
            return self.lookupType(self.extractTemplateArgument(str(typeobj.strip_typedefs()), position))
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    def numericTemplateArgument(self, typeobj, position):
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        # Workaround for gdb < 7.1
        try:
            return int(typeobj.template_argument(position))
        except RuntimeError as error:
            # ": No type named 30."
            msg = str(error)
            msg = msg[14:-1]
            # gdb at least until 7.4 produces for std::array<int, 4u>
            # for template_argument(1): RuntimeError: No type named 4u.
            if msg[-1] == 'u':
               msg = msg[0:-1]
            return int(msg)
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    def handleWatch(self, exp, iname):
        exp = str(exp)
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        escapedExp = b64encode(exp);
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        #warn("HANDLING WATCH %s, INAME: '%s'" % (exp, iname))
        if exp.startswith("[") and exp.endswith("]"):
            #warn("EVAL: EXP: %s" % exp)
            with TopLevelItem(self, iname):
                self.put('iname="%s",' % iname)
                self.put('wname="%s",' % escapedExp)
                try:
                    list = eval(exp)
                    self.putValue("")
                    self.putNoType()
                    self.putNumChild(len(list))
                    # This is a list of expressions to evaluate
                    with Children(self, len(list)):
                        itemNumber = 0
                        for item in list:
                            self.handleWatch(item, "%s.%d" % (iname, itemNumber))
                            itemNumber += 1
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                except RuntimeError as error:
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                    warn("EVAL: ERROR CAUGHT %s" % error)
                    self.putValue("<syntax error>")
                    self.putNoType()
                    self.putNumChild(0)
                    self.put("children=[],")
            return

        with TopLevelItem(self, iname):
            self.put('iname="%s",' % iname)
            self.put('wname="%s",' % escapedExp)
            if len(exp) == 0: # The <Edit> case
                self.putValue(" ")
                self.putNoType()
                self.putNumChild(0)
            else:
                try:
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                    value = self.parseAndEvaluate(exp)
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                    self.putItem(value)
                except RuntimeError:
                    self.currentType = " "
                    self.currentValue = "<no such value>"
                    self.currentChildNumChild = -1
                    self.currentNumChild = 0
                    self.putNumChild(0)

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    def intType(self):
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        self.cachedIntType = self.lookupType('int')
        self.intType = lambda: self.cachedIntType
        return self.cachedIntType
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    def charType(self):
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        return self.lookupType('char')
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    def sizetType(self):
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        return self.lookupType('size_t')
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    def charPtrType(self):
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        return self.lookupType('char*')
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    def voidPtrType(self):
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        return self.lookupType('void*')
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    def addressOf(self, value):
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        return toInteger(value.address)
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    def createPointerValue(self, address, pointeeType):
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        # This might not always work:
        # a Python 3 based GDB due to the bug addressed in
        # https://sourceware.org/ml/gdb-patches/2013-09/msg00571.html
        try:
            return gdb.Value(address).cast(pointeeType.pointer())
        except:
            # Try _some_ fallback (good enough for the std::complex dumper)
            return gdb.parse_and_eval("(%s*)%s" % (pointeeType, address))
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    def intSize(self):
        return 4

    def ptrSize(self):
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        self.cachedPtrSize = self.lookupType('void*').sizeof
        self.ptrSize = lambda: self.cachedPtrSize
        return self.cachedPtrSize
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    def createValue(self, address, referencedType):
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        try:
            return gdb.Value(address).cast(referencedType.pointer()).dereference()
        except:
            # Try _some_ fallback (good enough for the std::complex dumper)
            return gdb.parse_and_eval("{%s}%s" % (referencedType, address))
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    def selectedInferior(self):
        try:
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            # gdb.Inferior is new in gdb 7.2
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            self.cachedInferior = gdb.selected_inferior()
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        except:
            # Pre gdb 7.4. Right now we don't have more than one inferior anyway.
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            self.cachedInferior = gdb.inferiors()[0]

        # Memoize result.
        self.selectedInferior = lambda: self.cachedInferior
        return self.cachedInferior
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    def readRawMemory(self, addr, size):
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        mem = self.selectedInferior().read_memory(addr, size)
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        if sys.version_info[0] >= 3:
            mem.tobytes()
        return mem

    # FIXME: The commented out versions do not work with
    # a Python 3 based GDB due to the bug addressed in
    # https://sourceware.org/ml/gdb-patches/2013-09/msg00571.html
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    def dereference(self, addr):
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        #return long(gdb.Value(addr).cast(self.voidPtrType().pointer()).dereference())
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        ptrSize = self.ptrSize()
        code = "I" if ptrSize == 4 else "Q"
        return struct.unpack(code, self.readRawMemory(addr, ptrSize))[0]
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    def extractInt64(self, addr):
        return struct.unpack("q", self.readRawMemory(addr, 8))[0]

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    def extractInt(self, addr):
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        #return long(gdb.Value(addr).cast(self.intPtrType()).dereference())
        return struct.unpack("i", self.readRawMemory(addr, 4))[0]
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    def extractByte(self, addr):
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        #return long(gdb.Value(addr).cast(self.charPtrType()).dereference()) & 0xFF
        return struct.unpack("b", self.readRawMemory(addr, 1))[0]
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    # Do not use value.address here as this might not have one,
    # i.e. be the result of an inferior call
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    def dereferenceValue(self, value):
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        return toInteger(value.cast(self.voidPtrType()))
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    def isQObject(self, value):
        try:
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        #if True:
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            vtable = self.dereference(toInteger(value.address)) # + ptrSize
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            metaObjectEntry = self.dereference(vtable) # It's the first entry.
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            #warn("MO: 0x%x " % metaObjectEntry)
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            s = gdb.execute("info symbol 0x%x" % metaObjectEntry, to_string=True)
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            #warn("S: %s " % s)
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            #return s.find("::metaObject() const") > 0
            return s.find("::metaObject() const") > 0 or s.find("10metaObjectEv") > 0
            #return str(metaObjectEntry).find("::metaObject() const") > 0
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        except:
            return False
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    def isQObject_B(self, value):
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        # Alternative: Check for specific values, like targeting the
        # 'childEvent' member which is typically not overwritten, slot 8.
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        # ~"Symbol \"Myns::QObject::childEvent(Myns::QChildEvent*)\" is a
        #  function at address 0xb70f691a.\n"
        if self.childEventAddress == None:
            try:
                loc = gdb.execute("info address ::QObject::childEvent", to_string=True)
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                self.childEventAddress = toInteger(loc[loc.rfind(' '):-2], 16)
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            except:
                self.childEventAddress = 0

        try:
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            vtable = self.dereference(toInteger(value.address))
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            return self.childEventAddress == self.dereference(vtable + 8 * self.ptrSize())
        except:
            return False
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    def put(self, value):
        self.output.append(value)

    def putField(self, name, value):
        self.put('%s="%s",' % (name, value))

    def childRange(self):
        if self.currentMaxNumChild is None:
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            return xrange(0, toInteger(self.currentNumChild))
        return xrange(min(toInteger(self.currentMaxNumChild), toInteger(self.currentNumChild)))
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    def qtVersion(self):
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        try:
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            version = str(gdb.parse_and_eval("qVersion()"))
            (major, minor, patch) = version[version.find('"')+1:version.rfind('"')].split('.')
            self.cachedQtVersion = 0x10000 * int(major) + 0x100 * int(minor) + int(patch)
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        except:
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            try:
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                # This will fail on Qt 5
                gdb.execute("ptype QString::shared_empty", to_string=True)
                self.cachedQtVersion = 0x040800
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            except:
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                #self.cachedQtVersion = 0x050000
                # Assume Qt 5 until we have a definitive answer.
                return 0x050000

        # Memoize good results.
        self.qtVersion = lambda: self.cachedQtVersion
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        return self.cachedQtVersion
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    # Convenience function.
    def putItemCount(self, count, maximum = 1000000000):
        # This needs to override the default value, so don't use 'put' directly.
        if count > maximum:
            self.putValue('<>%s items>' % maximum)
        else:
            self.putValue('<%s items>' % count)

    def putType(self, type, priority = 0):
        # Higher priority values override lower ones.
        if priority >= self.currentTypePriority:
            self.currentType = str(type)
            self.currentTypePriority = priority

    def putNoType(self):
        # FIXME: replace with something that does not need special handling
        # in SubItem.__exit__().
        self.putBetterType(" ")

    def putInaccessible(self):
        #self.putBetterType(" ")
        self.putNumChild(0)
        self.currentValue = None

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    def putBetterType(self, type):
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        self.currentType = str(type)
        self.currentTypePriority = self.currentTypePriority + 1

    def putAddress(self, addr):
        if self.currentPrintsAddress:
            try:
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                # addr can be "None", int(None) fails.
                #self.put('addr="0x%x",' % int(addr))
                self.currentAddress = 'addr="0x%x",' % toInteger(addr)
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            except:
                pass

    def putNumChild(self, numchild):
        #warn("NUM CHILD: '%s' '%s'" % (numchild, self.currentChildNumChild))
        if numchild != self.currentChildNumChild:
            self.put('numchild="%s",' % numchild)

    def putEmptyValue(self, priority = -10):
        if priority >= self.currentValuePriority:
            self.currentValue = ""
            self.currentValuePriority = priority
            self.currentValueEncoding = None

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    def putSimpleValue(self, value, encoding = None, priority = 0):
        self.putValue(value, encoding, priority)

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    def putValue(self, value, encoding = None, priority = 0):
        # Higher priority values override lower ones.
        if priority >= self.currentValuePriority:
            self.currentValue = value
            self.currentValuePriority = priority
            self.currentValueEncoding = encoding

    def putPointerValue(self, value):
        # Use a lower priority
        if value is None:
            self.putEmptyValue(-1)
        else:
            self.putValue("0x%x" % value.cast(
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                self.lookupType("unsigned long")), None, -1)
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    def putDisplay(self, format, value = None, cmd = None):
        self.put('editformat="%s",' % format)
        if cmd is None:
            if not value is None:
                self.put('editvalue="%s",' % value)
        else:
            self.put('editvalue="%s|%s",' % (cmd, value))

    def putName(self, name):
        self.put('name="%s",' % name)

    def isExpanded(self):
        #warn("IS EXPANDED: %s in %s: %s" % (self.currentIName,
        #    self.expandedINames, self.currentIName in self.expandedINames))
        return self.currentIName in self.expandedINames

    def isExpandedSubItem(self, component):
        iname = "%s.%s" % (self.currentIName, component)
        #warn("IS EXPANDED: %s in %s" % (iname, self.expandedINames))
        return iname in self.expandedINames

    def stripNamespaceFromType(self, typeName):
        type = stripClassTag(typeName)
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        ns = self.qtNamespace()
        if len(ns) > 0 and type.startswith(ns):
            type = type[len(ns):]
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        pos = type.find("<")
        # FIXME: make it recognize  foo<A>::bar<B>::iterator?
        while pos != -1:
            pos1 = type.rfind(">", pos)
            type = type[0:pos] + type[pos1+1:]
            pos = type.find("<")
        return type

    def isMovableType(self, type):
        if type.code == PointerCode:
            return True
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        if self.isSimpleType(type):
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            return True
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        return self.isKnownMovableType(self.stripNamespaceFromType(str(type)))
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    def putIntItem(self, name, value):
        with SubItem(self, name):
            self.putValue(value)
            self.putType("int")
            self.putNumChild(0)

    def putBoolItem(self, name, value):
        with SubItem(self, name):
            self.putValue(value)
            self.putType("bool")
            self.putNumChild(0)

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    def putGenericItem(self, name, type, value, encoding = None):
        with SubItem(self, name):
            self.putValue(value, encoding)
            self.putType(type)
            self.putNumChild(0)

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    def putSubItem(self, component, value, tryDynamic=True):
        with SubItem(self, component):
            self.putItem(value, tryDynamic)

    def putNamedSubItem(self, component, value, name):
        with SubItem(self, component):
            self.putName(name)
            self.putItem(value)

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    def isSimpleType(self, typeobj):
        code = typeobj.code
        return code == BoolCode \
            or code == CharCode \
            or code == IntCode \
            or code == FloatCode \
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            or code == EnumCode
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    def simpleEncoding(self, typeobj):
        code = typeobj.code
        if code == BoolCode or code == CharCode:
            return Hex2EncodedInt1
        if code == IntCode:
            if str(typeobj).find("unsigned") >= 0:
                if typeobj.sizeof == 1:
                    return Hex2EncodedUInt1
                if typeobj.sizeof == 2:
                    return Hex2EncodedUInt2
                if typeobj.sizeof == 4:
                    return Hex2EncodedUInt4
                if typeobj.sizeof == 8:
                    return Hex2EncodedUInt8
            else:
                if typeobj.sizeof == 1:
                    return Hex2EncodedInt1
                if typeobj.sizeof == 2:
                    return Hex2EncodedInt2
                if typeobj.sizeof == 4:
                    return Hex2EncodedInt4
                if typeobj.sizeof == 8:
                    return Hex2EncodedInt8
        if code == FloatCode:
            if typeobj.sizeof == 4:
                return Hex2EncodedFloat4
            if typeobj.sizeof == 8:
                return Hex2EncodedFloat8
        return None

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    def tryPutArrayContents(self, typeobj, base, n):
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        enc = self.simpleEncoding(typeobj)
        if not enc:
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            return False
        size = n * typeobj.sizeof;
        self.put('childtype="%s",' % typeobj)
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        self.put('addrbase="0x%x",' % toInteger(base))
        self.put('addrstep="0x%x",' % toInteger(typeobj.sizeof))
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        self.put('arrayencoding="%s",' % enc)
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        self.put('arraydata="')
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        self.put(self.readMemory(base, size))
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        self.put('",')
        return True

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    def isReferenceType(self, typeobj):
        return typeobj.code == gdb.TYPE_CODE_REF

    def isStructType(self, typeobj):
        return typeobj.code == gdb.TYPE_CODE_STRUCT

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    def putPlotData(self, type, base, n, plotFormat):
        if self.isExpanded():
            self.putArrayData(type, base, n)
        if not hasPlot():
            return
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        if not self.isSimpleType(type):
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            #self.putValue(self.currentValue + " (not plottable)")
            self.putValue(self.currentValue)
            self.putField("plottable", "0")
            return
        global gnuplotPipe
        global gnuplotPid
        format = self.currentItemFormat()
        iname = self.currentIName
        #if False:
        if format != plotFormat:
            if iname in gnuplotPipe:
                os.kill(gnuplotPid[iname], 9)
                del gnuplotPid[iname]
                gnuplotPipe[iname].terminate()
                del gnuplotPipe[iname]
            return
        base = base.cast(type.pointer())
        if not iname in gnuplotPipe:
            gnuplotPipe[iname] = subprocess.Popen(["gnuplot"],
                    stdin=subprocess.PIPE)
            gnuplotPid[iname] = gnuplotPipe[iname].pid
        f = gnuplotPipe[iname].stdin;
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        # On Ubuntu install gnuplot-x11
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        f.write("set term wxt noraise\n")
        f.write("set title 'Data fields'\n")
        f.write("set xlabel 'Index'\n")
        f.write("set ylabel 'Value'\n")
        f.write("set grid\n")
        f.write("set style data lines;\n")
        f.write("plot  '-' title '%s'\n" % iname)
        for i in range(1, n):
            f.write(" %s\n" % base.dereference())
            base += 1
        f.write("e\n")


    def putArrayData(self, type, base, n,
            childNumChild = None, maxNumChild = 10000):
        if not self.tryPutArrayContents(type, base, n):
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            base = base.cast(type.pointer())
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            with Children(self, n, type, childNumChild, maxNumChild,
                    base, type.sizeof):
                for i in self.childRange():
                    self.putSubItem(i, (base + i).dereference())

    def putCallItem(self, name, value, func, *args):
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        result = self.call2(value, func, args)
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        with SubItem(self, name):
            self.putItem(result)

    def putItem(self, value, tryDynamic=True):
        if value is None:
            # Happens for non-available watchers in gdb versions that
            # need to use gdb.execute instead of gdb.parse_and_eval
            self.putValue("<not available>")
            self.putType("<unknown>")
            self.putNumChild(0)
            return

        type = value.type.unqualified()
        typeName = str(type)
        tryDynamic &= self.useDynamicType
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        self.addToCache(type) # Fill type cache
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        if tryDynamic:
            self.putAddress(value.address)

        # FIXME: Gui shows references stripped?
        #warn(" ")
        #warn("REAL INAME: %s " % self.currentIName)
        #warn("REAL TYPE: %s " % value.type)
        #warn("REAL CODE: %s " % value.type.code)
        #warn("REAL VALUE: %s " % value)

        if type.code == ReferenceCode:
            try:
                # Try to recognize null references explicitly.
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                if toInteger(value.address) == 0:
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                    self.putValue("<null reference>")
                    self.putType(typeName)
                    self.putNumChild(0)
                    return
            except:
                pass

            if tryDynamic:
                try:
                    # Dynamic references are not supported by gdb, see
                    # http://sourceware.org/bugzilla/show_bug.cgi?id=14077.
                    # Find the dynamic type manually using referenced_type.
                    value = value.referenced_value()
                    value = value.cast(value.dynamic_type)
                    self.putItem(value)
                    self.putBetterType("%s &" % value.type)
                    return
                except:
                    pass

            try:
                # FIXME: This throws "RuntimeError: Attempt to dereference a
                # generic pointer." with MinGW's gcc 4.5 when it "identifies"
                # a "QWidget &" as "void &" and with optimized out code.
                self.putItem(value.cast(type.target().unqualified()))
                self.putBetterType(typeName)
                return
            except RuntimeError:
                self.putValue("<optimized out reference>")
                self.putType(typeName)
                self.putNumChild(0)
                return

1318
        if type.code == IntCode or type.code == CharCode:
1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354
            self.putType(typeName)
            if value.is_optimized_out:
                self.putValue("<optimized out>")
            else:
                self.putValue(value)
            self.putNumChild(0)
            return

        if type.code == FloatCode or type.code == BoolCode:
            self.putType(typeName)
            if value.is_optimized_out:
                self.putValue("<optimized out>")
            else:
                self.putValue(value)
            self.putNumChild(0)
            return

        if type.code == EnumCode:
            self.putType(typeName)
            if value.is_optimized_out:
                self.putValue("<optimized out>")
            else:
                self.putValue("%s (%d)" % (value, value))
            self.putNumChild(0)
            return

        if type.code == ComplexCode:
            self.putType(typeName)
            if value.is_optimized_out:
                self.putValue("<optimized out>")
            else:
                self.putValue("%s" % value)
            self.putNumChild(0)
            return

        if type.code == TypedefCode:
1355
            if typeName in self.qqDumpers:
1356
                self.putType(typeName)
1357
                self.qqDumpers[typeName](self, value)
1358 1359 1360 1361 1362 1363 1364
                return

            type = stripTypedefs(type)
            # The cast can destroy the address?
            #self.putAddress(value.address)
            # Workaround for http://sourceware.org/bugzilla/show_bug.cgi?id=13380
            if type.code == ArrayCode:
1365
                value = self.parseAndEvaluate("{%s}%s" % (type, value.address))
1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400
            else:
                try:
                    value = value.cast(type)
                except:
                    self.putValue("<optimized out typedef>")
                    self.putType(typeName)
                    self.putNumChild(0)
                    return

            self.putItem(value)
            self.putBetterType(typeName)
            return

        if type.code == ArrayCode:
            qdump____c_style_array__(self, value)
            return

        if type.code == PointerCode:
            #warn("POINTER: %s" % value)

            # This could still be stored in a register and
            # potentially dereferencable.
            if value.is_optimized_out:
                self.putValue("<optimized out>")

            try:
                value.dereference()
            except:
                # Failure to dereference a pointer should at least
                # show the value of a pointer.
                self.putValue(cleanAddress(value))
                self.putType(typeName)
                self.putNumChild(0)
                return

1401
            if self.isNull(value):
1402 1403 1404 1405 1406 1407 1408 1409
                #warn("NULL POINTER")
                self.putType(typeName)
                self.putValue("0x0")
                self.putNumChild(0)
                return

            innerType = type.target()
            innerTypeName = str(innerType.unqualified())
1410
            format = self.currentItemFormat(type)
1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421

            if innerType.code == VoidCode:
                #warn("VOID POINTER: %s" % format)
                self.putType(typeName)
                self.putValue(str(value))
                self.putNumChild(0)
                return

            if format == None and innerTypeName == "char":
                # Use Latin1 as default for char *.
                self.putType(typeName)
1422
                self.putValue(self.encodeCharArray(value), Hex2EncodedLatin1)
1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439
                self.putNumChild(0)
                return

            if format == 0:
                # Explicitly requested bald pointer.
                self.putType(typeName)
                self.putPointerValue(value)
                self.putNumChild(1)
                if self.currentIName in self.expandedINames:
                    with Children(self):
                        with SubItem(self, '*'):
                            self.putItem(value.dereference())
                return

            if format == 1:
                # Explicitly requested Latin1 formatting.
                self.putType(typeName)
1440
                self.putValue(self.encodeCharArray(value), Hex2EncodedLatin1)
1441 1442 1443 1444 1445 1446
                self.putNumChild(0)
                return

            if format == 2:
                # Explicitly requested UTF-8 formatting.
                self.putType(typeName)
1447
                self.putValue(self.encodeCharArray(value), Hex2EncodedUtf8)
1448 1449 1450 1451 1452 1453
                self.putNumChild(0)
                return

            if format == 3:
                # Explicitly requested local 8 bit formatting.
                self.putType(typeName)
1454
                self.putValue(self.encodeCharArray(value), Hex2EncodedLocal8Bit)
1455 1456 1457 1458 1459 1460
                self.putNumChild(0)
                return

            if format == 4:
                # Explicitly requested UTF-16 formatting.
                self.putType(typeName)
1461
                self.putValue(self.encodeChar2Array(value), Hex4EncodedLittleEndian)
1462 1463 1464 1465 1466 1467
                self.putNumChild(0)
                return

            if format == 5:
                # Explicitly requested UCS-4 formatting.