/usr/share/kdevlldb/formatters/helpers.py is in kdevelop-data 4:5.2.1-1ubuntu4.
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# LLDB data formatter helpers
# Copyright 2016 Aetf <aetf@unlimitedcodeworks.xyz>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of
# the License or (at your option) version 3 or any later version
# accepted by the membership of KDE e.V. (or its successor approved
# by the membership of KDE e.V.), which shall act as a proxy
# defined in Section 14 of version 3 of the license.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# BEGIN: Utilities for wrapping differences of Python 2.x and Python 3
# Inspired by http://pythonhosted.org/six/
from __future__ import print_function
import sys
import lldb
# Useful for very coarse version differentiation.
PY2 = sys.version_info[0] == 2
PY3 = sys.version_info[0] == 3
# create Python 2.x & 3.x compatible iterator base
if PY3:
Iterator = object
else:
class Iterator(object):
def next(self):
return type(self).__next__(self)
if PY3:
unichr = chr
unicode = str
else:
unichr = unichr
# END
def canonicalized_type_name(name):
"""Canonicalize the type name for FindFirstType usage.
+ 1 space between template arguments (after comma)
+ no space before pointer *
otherwise FindFirstType returns None
"""
return name.replace(' ', '').replace(',', ', ')
def quote(string, quote='"'):
"""Quote a string so it's suitable to be used in quote"""
if isinstance(string, unicode):
ls = []
for uch in string:
code = ord(uch)
if code > 255:
ls += '\\u{:04x}'.format(code)
elif code >= 127:
ls += '\\x{:02x}'.format(code)
elif uch == quote or uch == '\\':
ls += '\\' + chr(code)
elif code == 0:
ls += '\\x00'
else:
ls += chr(code)
return quote + ''.join(ls) + quote
else:
return '{q}{s}{q}'.format(s=string.replace('\\', '\\\\').replace(quote, '\\' + quote),
q=quote)
def unquote(data, quote='"'):
"""Unquote a string"""
if data.startswith(quote) and data.endswith(quote):
data = data[1:-1]
ls = []
esc = False
for ch in data:
if esc:
ls.append(ch)
esc = False
else:
if ch == '\\':
esc = True
else:
ls.append(ch)
if esc:
print('WARNING: unpaired escape')
data = ''.join(ls)
return data
def invoke(val, method, args=''):
"""Try to invoke a method on val, args are passed in as an expression string"""
# first try to get a valid frame
frame = None
for f in [val.frame, lldb.frame, val.process.selected_thread.GetFrameAtIndex(0)]:
if f.IsValid():
frame = f
break
if frame is None:
return lldb.SBValue()
# second try to get a pointer to val
if val.GetType().IsPointerType():
ptype = val.GetType()
addr = val.GetValueAsUnsigned(0)
else:
ptype = val.GetType().GetPointerType()
addr = val.AddressOf().GetValueAsUnsigned(0)
# third, build expression
expr = 'reinterpret_cast<const {}>({})->{}({})'.format(ptype.GetName(), addr, method, args)
res = frame.EvaluateExpression(expr)
# if not res.IsValid():
# print 'Expr {} on value {} failed'.format(expr, val.GetName())
return res
def rename(name, val):
"""Rename a SBValue"""
return val.CreateValueFromData(name, val.GetData(), val.GetType())
def toSBPointer(valobj, addr, pointee_type):
"""Convert a addr integer to SBValue"""
addr = addr & 0xFFFFFFFFFFFFFFFF # force unsigned
return valobj.CreateValueFromAddress(None, addr, pointee_type).AddressOf()
def validAddr(valobj, addr):
"""Test if a address is valid"""
return toSBPointer(valobj, addr,
valobj.GetType().GetBasicType(lldb.eBasicTypeVoid).GetPointerType()).IsValid()
def validPointer(pointer):
"""Test if a SBValue pointer is valid"""
if not pointer.IsValid():
return False
if pointer.GetValueAsUnsigned(0) == 0:
return False
return toSBPointer(pointer, pointer.GetValueAsUnsigned(0), pointer.GetType().GetPointeeType()).IsValid()
class AutoCacheValue(object):
"""An object that can create itself when needed and cache the result"""
def __init__(self, creator):
super(AutoCacheValue, self).__init__()
self.creator = creator
self.cache = None
self.cached = False
def get(self):
if not self.cached:
self.cache = self.creator()
self.cached = True
return self.cache
class HiddenMemberProvider(object):
"""A lldb synthetic provider that can provide hidden children.
Original children is exposed in this way"""
@staticmethod
def _capping_size():
return 255
def __init__(self, valobj, internal_dict):
self.valobj = valobj
# number of normally visible children
self._num_children = 0
# cache for visible children
self._members = []
# cache for hidden children
self._hiddens = []
# child name to index
self._name2idx = {}
# whether to add original children
self._add_original = True
# some useful info
process = self.valobj.GetProcess()
self._endianness = process.GetByteOrder()
self._pointer_size = process.GetAddressByteSize()
self._char_type = valobj.GetType().GetBasicType(lldb.eBasicTypeChar)
def has_children(self):
return self._num_children != 0
def num_children(self):
return self._num_children
def get_child_index(self, name):
if name in self._name2idx:
return self._name2idx[name]
return None
def get_child_at_index(self, idx):
if not self.valobj.IsValid():
return None
if idx < 0:
return None
elif idx < self._num_children:
child = self._members[idx]
# These are hidden children, which won't be queried by lldb, but we know
# they are there, so we can use them in summary provider, to avoid another
# fetch from the inferior, and don't shadow original children
elif idx < self._num_children + len(self._hiddens):
child = self._hiddens[idx - self._num_children]
else:
return None
if isinstance(child, AutoCacheValue):
child = child.get()
return child
@staticmethod
def _getName(var):
if isinstance(var, lldb.SBValue):
return var.GetName()
else:
return var[0]
def update(self):
self._num_children = -1
self._members = []
self._hiddens = []
self._name2idx = {}
if not self.valobj.IsValid():
return
# call _update on subclass
self._update()
# add valobj's original children as hidden children,
# must be called after self._update, so subclass has chance
# to disable it.
if self._add_original:
for v in self.valobj:
self._addChild(v, hidden=True)
# update num_children
if self._num_children < 0:
self._num_children = len(self._members)
# build name to index lookup, hidden value first, so normal value takes precedence
self._name2idx = {
self._getName(self._hiddens[idx]): idx + self._num_children
for idx in range(0, len(self._hiddens))
}
self._name2idx.update({
self._getName(self._members[idx]): idx
for idx in range(0, self._num_children)
})
def _update(self):
"""override in subclass"""
pass
def _addChild(self, var, hidden=False):
if not isinstance(var, lldb.SBValue):
# special handling for (name, expr) tuple of string constants
if len(var) != 2:
print('error, const char[] value should be a tuple with two elements, it is', var)
name, content = var
if isinstance(content, unicode):
content = content.encode()
try:
char_arr_type = self._char_type.GetArrayType(len(content));
strdata = lldb.SBData.CreateDataFromCString(self._endianness, self._pointer_size, content)
var = self.valobj.CreateValueFromData(name, strdata, char_arr_type)
except:
pass
cache = self._hiddens if hidden else self._members
cache.append(var)
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