# -*- coding: utf-8 -*-
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# This file is part of Eigen, a lightweight C++ template library
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# for linear algebra.
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#
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# Copyright (C) 2009 Benjamin Schindler <bschindler@inf.ethz.ch>
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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# Pretty printers for Eigen::Matrix
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# This is still pretty basic as the python extension to gdb is still pretty basic.
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# It cannot handle complex eigen types and it doesn't support any of the other eigen types
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# Such as quaternion or some other type.
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# This code supports fixed size as well as dynamic size matrices
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# To use it:
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#
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# * Create a directory and put the file as well as an empty __init__.py in
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# that directory.
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# * Create a ~/.gdbinit file, that contains the following:
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# python
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# import sys
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# sys.path.insert(0, '/path/to/eigen/printer/directory')
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# from printers import register_eigen_printers
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# register_eigen_printers (None)
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# end
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import gdb
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import re
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import itertools
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class EigenMatrixPrinter:
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"Print Eigen Matrix or Array of some kind"
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def __init__(self, variety, val):
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"Extract all the necessary information"
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# Save the variety (presumably "Matrix" or "Array") for later usage
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self.variety = variety
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# The gdb extension does not support value template arguments - need to extract them by hand
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type = val.type
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if type.code == gdb.TYPE_CODE_REF:
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type = type.target()
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self.type = type.unqualified().strip_typedefs()
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tag = self.type.tag
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regex = re.compile('\<.*\>')
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m = regex.findall(tag)[0][1:-1]
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template_params = m.split(',')
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template_params = [x.replace(" ", "") for x in template_params]
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if template_params[1] == '-0x00000000000000001' or template_params[1] == '-0x000000001' or template_params[1] == '-1':
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self.rows = val['m_storage']['m_rows']
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else:
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self.rows = int(template_params[1])
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if template_params[2] == '-0x00000000000000001' or template_params[2] == '-0x000000001' or template_params[2] == '-1':
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self.cols = val['m_storage']['m_cols']
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else:
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self.cols = int(template_params[2])
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self.options = 0 # default value
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if len(template_params) > 3:
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self.options = template_params[3];
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self.rowMajor = (int(self.options) & 0x1)
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self.innerType = self.type.template_argument(0)
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self.val = val
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# Fixed size matrices have a struct as their storage, so we need to walk through this
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self.data = self.val['m_storage']['m_data']
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if self.data.type.code == gdb.TYPE_CODE_STRUCT:
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self.data = self.data['array']
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self.data = self.data.cast(self.innerType.pointer())
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class _iterator:
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def __init__ (self, rows, cols, dataPtr, rowMajor):
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self.rows = rows
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self.cols = cols
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self.dataPtr = dataPtr
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self.currentRow = 0
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self.currentCol = 0
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self.rowMajor = rowMajor
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def __iter__ (self):
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return self
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def next(self):
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return self.__next__() # Python 2.x compatibility
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def __next__(self):
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row = self.currentRow
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col = self.currentCol
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if self.rowMajor == 0:
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if self.currentCol >= self.cols:
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raise StopIteration
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self.currentRow = self.currentRow + 1
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if self.currentRow >= self.rows:
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self.currentRow = 0
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self.currentCol = self.currentCol + 1
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else:
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if self.currentRow >= self.rows:
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raise StopIteration
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self.currentCol = self.currentCol + 1
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if self.currentCol >= self.cols:
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self.currentCol = 0
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self.currentRow = self.currentRow + 1
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item = self.dataPtr.dereference()
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self.dataPtr = self.dataPtr + 1
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if (self.cols == 1): #if it's a column vector
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return ('[%d]' % (row,), item)
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elif (self.rows == 1): #if it's a row vector
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return ('[%d]' % (col,), item)
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return ('[%d,%d]' % (row, col), item)
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def children(self):
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return self._iterator(self.rows, self.cols, self.data, self.rowMajor)
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def to_string(self):
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return "Eigen::%s<%s,%d,%d,%s> (data ptr: %s)" % (self.variety, self.innerType, self.rows, self.cols, "RowMajor" if self.rowMajor else "ColMajor", self.data)
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class EigenQuaternionPrinter:
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"Print an Eigen Quaternion"
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def __init__(self, val):
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"Extract all the necessary information"
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# The gdb extension does not support value template arguments - need to extract them by hand
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type = val.type
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if type.code == gdb.TYPE_CODE_REF:
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type = type.target()
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self.type = type.unqualified().strip_typedefs()
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self.innerType = self.type.template_argument(0)
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self.val = val
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# Quaternions have a struct as their storage, so we need to walk through this
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self.data = self.val['m_coeffs']['m_storage']['m_data']['array']
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self.data = self.data.cast(self.innerType.pointer())
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class _iterator:
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def __init__ (self, dataPtr):
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self.dataPtr = dataPtr
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self.currentElement = 0
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self.elementNames = ['x', 'y', 'z', 'w']
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def __iter__ (self):
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return self
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def next(self):
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return self.__next__() # Python 2.x compatibility
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def __next__(self):
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element = self.currentElement
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if self.currentElement >= 4: #there are 4 elements in a quanternion
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raise StopIteration
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self.currentElement = self.currentElement + 1
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item = self.dataPtr.dereference()
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self.dataPtr = self.dataPtr + 1
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return ('[%s]' % (self.elementNames[element],), item)
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def children(self):
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return self._iterator(self.data)
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def to_string(self):
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return "Eigen::Quaternion<%s> (data ptr: %s)" % (self.innerType, self.data)
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def build_eigen_dictionary ():
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pretty_printers_dict[re.compile('^Eigen::Quaternion<.*>$')] = lambda val: EigenQuaternionPrinter(val)
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pretty_printers_dict[re.compile('^Eigen::Matrix<.*>$')] = lambda val: EigenMatrixPrinter("Matrix", val)
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pretty_printers_dict[re.compile('^Eigen::Array<.*>$')] = lambda val: EigenMatrixPrinter("Array", val)
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def register_eigen_printers(obj):
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"Register eigen pretty-printers with objfile Obj"
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if obj == None:
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obj = gdb
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obj.pretty_printers.append(lookup_function)
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def lookup_function(val):
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"Look-up and return a pretty-printer that can print va."
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type = val.type
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if type.code == gdb.TYPE_CODE_REF:
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type = type.target()
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type = type.unqualified().strip_typedefs()
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typename = type.tag
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if typename == None:
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return None
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for function in pretty_printers_dict:
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if function.search(typename):
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return pretty_printers_dict[function](val)
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return None
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pretty_printers_dict = {}
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build_eigen_dictionary ()
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