vectorwrapper/gdb/vectorwrapper.py

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#
2020-05-04 01:59:02 +00:00
# Copyright 2015-2020 Michele "King_DuckZ" Santullo
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import gdb.printing
#NOTE:
#This pretty-printer has been written for vectorwrapper + std::array.
#You will have to customize it if your wrapped type is different.
class VectorWrapperStdArrPrinter(object):
"Print values in a VectorWrapper<std::array>"
class _iterator(object):
def __init__(self, start, size):
self.item = start
self.pos = 0
self.size = size
def __iter__(self):
return self
def __next__(self):
if self.pos == self.size:
raise StopIteration
elt = self.item.dereference()
self.item = self.item + 1
self.pos = self.pos + 1
return str(elt)
def __init__(self, val):
self.val = val
self.dimensions = int(val.type.template_argument(1))
def to_string(self):
#get the scalar[n] value
stdarray_elems = self.val['m_wrapped']['_M_elems']
#get the actual scalar type
elem_type = self.val['m_wrapped'].type.template_argument(0)
#cast scalar[n] to scalar*
ptr = stdarray_elems.address.cast(elem_type.pointer())
#iterate over the values in scalar* and str() them
retval = "vec" + str(self.dimensions) + "<" + \
", ".join(
str(itm) for itm in self._iterator(ptr, self.dimensions)
) + ">"
return retval
def display_hint(self):
return 'string'
def build_pretty_printer():
pp = gdb.printing.RegexpCollectionPrettyPrinter(__name__)
#add your namespace before 'vwr' if you're using a custom one
pp.add_printer('vwr', '^vwr::Vec<std::array.+$', VectorWrapperStdArrPrinter)
return pp
gdb.printing.register_pretty_printer(
gdb.current_objfile(),
build_pretty_printer()
)