gdbbridge.py 71.1 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



#
# VTable
#
def hasVTable(type):
    fields = type.fields()
    if len(fields) == 0:
        return False
    if fields[0].is_base_class:
        return hasVTable(fields[0].type)
    return str(fields[0].type) ==  "int (**)(void)"

def dynamicTypeName(value):
    if hasVTable(value.type):
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        #vtbl = str(parseAndEvaluate("{int(*)(int)}%s" % int(value.address)))
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        try:
            # Fails on 7.1 due to the missing to_string.
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            vtbl = gdb.execute("info symbol {int*}%s" % int(value.address),
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                to_string = True)
            pos1 = vtbl.find("vtable ")
            if pos1 != -1:
                pos1 += 11
                pos2 = vtbl.find(" +", pos1)
                if pos2 != -1:
                    return vtbl[pos1 : pos2]
        except:
            pass
    return str(value.type)

def downcast(value):
    try:
        return value.cast(value.dynamic_type)
    except:
        pass
    #try:
    #    return value.cast(lookupType(dynamicTypeName(value)))
    #except:
    #    pass
    return value

def expensiveDowncast(value):
    try:
        return value.cast(value.dynamic_type)
    except:
        pass
    try:
        return value.cast(lookupType(dynamicTypeName(value)))
    except:
        pass
    return value

typeCache = {}

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typesToReport = {}
typesReported = {}

def addToCache(type):
    global typesReported
    global typesToReport
    typename = str(type)
    if typename in typesReported:
        return
    typesReported[typename] = True
    typesToReport[typename] = type

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def lookupType(typestring):
    global typeCache
    global typesToReport
    type = typeCache.get(typestring)
    #warn("LOOKUP 1: %s -> %s" % (typestring, type))
    if not type is None:
        return type

    if typestring == "void":
        type = gdb.lookup_type(typestring)
        typeCache[typestring] = type
        typesToReport[typestring] = type
        return type

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    #try:
    #    type = gdb.parse_and_eval("{%s}&main" % typestring).type
    #    if not type is None:
    #        typeCache[typestring] = type
    #        typesToReport[typestring] = type
    #        return type
    #except:
    #    pass
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    # See http://sourceware.org/bugzilla/show_bug.cgi?id=13269
    # gcc produces "{anonymous}", gdb "(anonymous namespace)"
    # "<unnamed>" has been seen too. The only thing gdb
    # understands when reading things back is "(anonymous namespace)"
    if typestring.find("{anonymous}") != -1:
        ts = typestring
        ts = ts.replace("{anonymous}", "(anonymous namespace)")
        type = lookupType(ts)
        if not type is None:
            typeCache[typestring] = type
            typesToReport[typestring] = type
            return type

    #warn(" RESULT FOR 7.2: '%s': %s" % (typestring, type))

    # This part should only trigger for
    # gdb 7.1 for types with namespace separators.
    # And anonymous namespaces.

    ts = typestring
    while True:
        #warn("TS: '%s'" % ts)
        if ts.startswith("class "):
            ts = ts[6:]
        elif ts.startswith("struct "):
            ts = ts[7:]
        elif ts.startswith("const "):
            ts = ts[6:]
        elif ts.startswith("volatile "):
            ts = ts[9:]
        elif ts.startswith("enum "):
            ts = ts[5:]
        elif ts.endswith(" const"):
            ts = ts[:-6]
        elif ts.endswith(" volatile"):
            ts = ts[:-9]
        elif ts.endswith("*const"):
            ts = ts[:-5]
        elif ts.endswith("*volatile"):
            ts = ts[:-8]
        else:
            break

    if ts.endswith('*'):
        type = lookupType(ts[0:-1])
        if not type is None:
            type = type.pointer()
            typeCache[typestring] = type
            typesToReport[typestring] = type
            return type

    try:
        #warn("LOOKING UP '%s'" % ts)
        type = gdb.lookup_type(ts)
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    except RuntimeError as error:
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        #warn("LOOKING UP '%s': %s" % (ts, error))
        # See http://sourceware.org/bugzilla/show_bug.cgi?id=11912
        exp = "(class '%s'*)0" % ts
        try:
            type = parseAndEvaluate(exp).type.target()
        except:
            # Can throw "RuntimeError: No type named class Foo."
            pass
    except:
        #warn("LOOKING UP '%s' FAILED" % ts)
        pass

    if not type is None:
        typeCache[typestring] = type
        typesToReport[typestring] = type
        return type

    # This could still be None as gdb.lookup_type("char[3]") generates
    # "RuntimeError: No type named char[3]"
    typeCache[typestring] = type
    typesToReport[typestring] = type
    return type

def templateArgument(type, position):
    try:
        # This fails on stock 7.2 with
        # "RuntimeError: No type named myns::QObject.\n"
        return type.template_argument(position)
    except:
        # That's something like "myns::QList<...>"
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        return lookupType(self.extractTemplateArgument(str(type.strip_typedefs()), position))
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# Workaround for gdb < 7.1
def numericTemplateArgument(type, position):
    try:
        return int(type.template_argument(position))
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    except RuntimeError as error:
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        # ": 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)


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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    #(type, expr, value) = args.split(",")
    theDumper.bbedit(args.split(","))
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registerCommand("bbedit", bbedit)


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

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def bb(args):
    global typesToReport
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    global theDumper
    theDumper.run(args)
    output = theDumper.output
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    output.append('],typeinfo=[')
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    for name in typesToReport.keys():
        type = typesToReport[name]
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        # Happens e.g. for '(anonymous namespace)::InsertDefOperation'
        if not type is None:
            output.append('{name="%s",size="%s"}'
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                % (b64encode(name), type.sizeof))
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    output.append(']')
    typesToReport = {}
    return "".join(output)


def p1(args):
    import cProfile
    cProfile.run('bb("%s")' % args, "/tmp/bbprof")
    import pstats
    pstats.Stats('/tmp/bbprof').sort_stats('time').print_stats()
    return ""


def p2(args):
    import timeit
    return timeit.repeat('bb("%s")' % args,
        'from __main__ import bb', number=10)

registerCommand("bb", bb)
registerCommand("p1", p1)
registerCommand("p2", p2)

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def extractQtVersion():
    version = str(gdb.parse_and_eval("qVersion()"))
    (major, minor, patch) = version[version.find('"')+1:version.rfind('"')].split('.')
    return 0x10000 * int(major) + 0x100 * int(minor) + int(patch)

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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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        # Later set, or not set:
        #self.cachedQtVersion
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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:
            value = downcast(item.value) if self.useDynamicType else item.value
            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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    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 = self.parseAndEvaluate(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
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