Added a pretty printer python script for Eigen::Matrix (gdb-7.0 and later).

debug/gdb/printers.py

@@ -0,0 +1,115 @@
+# -*- coding: iso-8859-1 -*-
+# Pretty printers for Eigen::Matrix
+# Author: Benjamin Schindler <bschindler@inf.ethz.ch>
+# This is still pretty basic as the python extension to gdb is still pretty basic. 
+# It cannot handle complex eigen types and it doesn't support any of the other eigen types
+# Such as quaternion or some other type. 
+# This code supports fixed size as well as dynamic size matrices
+# Licence - ment to be included in Eigen, so dual GPLv3 or LGPL
+# NOTE: This code was only tested with the stable branch of eigen!
+
+import gdb
+import re
+import itertools
+
+
+class EigenMatrixPrinter:
+	"Print Eigen Matrix of some kind"
+
+	def __init__(self, val):
+		"Extract all the necessary information"
+		# The gdb extension does not support value template arguments - need to extract them by hand
+		type = val.type
+		if type.code == gdb.TYPE_CODE_REF:
+			type = type.target()
+		self.type = type.unqualified().strip_typedefs()
+		tag = self.type.tag
+		regex = re.compile('\<.*\>')
+		m = regex.findall(tag)[0][1:-1]
+		template_params = m.split(',')
+		template_params = map(lambda x:x.replace(" ", ""), template_params)
+
+		self.rows = int(template_params[1])
+		self.cols = int(template_params[2])
+
+		if self.rows == 10000:
+			self.rows = val['m_storage']['m_rows']
+
+		if self.cols == 10000:
+			self.cols = val['m_storage']['m_cols']
+
+		self.innerType = self.type.template_argument(0)
+
+		self.val = val
+
+	class _iterator:
+		def __init__ (self, rows, cols, dataPtr):
+			self.rows = rows
+			self.cols = cols
+			self.dataPtr = dataPtr
+			self.currentRow = 0
+			self.currentCol = 0
+
+		def __iter__ (self):
+			return self
+
+		def next(self):
+			if self.currentCol >= self.cols:
+				raise StopIteration
+
+			row = self.currentRow
+			col = self.currentCol
+			self.currentRow = self.currentRow + 1
+			if self.currentRow >= self.rows:
+				self.currentRow = 0
+				self.currentCol = self.currentCol + 1
+
+			item = self.dataPtr.dereference()
+			self.dataPtr = self.dataPtr + 1
+
+			return ('[%d, %d]' % (row, col), item)
+
+	def children(self):
+		data = self.val['m_storage']['m_data']
+		# Fixed size matrices have a struct as their storage, so we need to walk through this
+		if data.type.code == gdb.TYPE_CODE_STRUCT:
+			data = data['array']
+			data = data.cast(self.innerType.pointer())
+		return self._iterator(self.rows, self.cols, data)
+
+	def to_string(self):
+		return "Eigen::Matrix<%s,%d,%d>" % (self.innerType, self.rows, self.cols)
+
+def build_eigen_dictionary ():
+	pretty_printers_dict[re.compile('^Eigen::Matrix<.*>$')] = lambda val: EigenMatrixPrinter(val)
+
+def register_eigen_printers(obj):
+	"Register eigen pretty-printers with objfile Obj"
+
+	if obj == None:
+		obj = gdb
+	obj.pretty_printers.append(lookup_function)
+
+def lookup_function(val):
+	"Look-up and return a pretty-printer that can print va."
+
+	type = val.type
+
+	if type.code == gdb.TYPE_CODE_REF:
+		type = type.target()
+	
+	type = type.unqualified().strip_typedefs()
+
+	typename = type.tag
+	if typename == None:
+		return None
+
+	for function in pretty_printers_dict:
+		if function.search(typename):
+			return pretty_printers_dict[function](val)
+
+	return None
+
+pretty_printers_dict = {}
+
+build_eigen_dictionary ()