add gdb scripts for gcc 11.2 stl types

tools/gdb-scripts/gcc-11.2.0/python/libstdcxx/__init__.py

@@ -0,0 +1 @@
+

tools/gdb-scripts/gcc-11.2.0/python/libstdcxx/v6/__init__.py

@@ -0,0 +1,33 @@
+# Copyright (C) 2014-2021 Free Software Foundation, Inc.
+
+# 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 3 of the License, or
+# (at your option) any later version.
+#
+# 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/>.
+
+import gdb
+
+# Load the xmethods if GDB supports them.
+def gdb_has_xmethods():
+    try:
+        import gdb.xmethod
+        return True
+    except ImportError:
+        return False
+
+def register_libstdcxx_printers(obj):
+    # Load the pretty-printers.
+    from .printers import register_libstdcxx_printers
+    register_libstdcxx_printers(obj)
+
+    if gdb_has_xmethods():
+        from .xmethods import register_libstdcxx_xmethods
+        register_libstdcxx_xmethods(obj)

tools/gdb-scripts/gcc-11.2.0/python/libstdcxx/v6/xmethods.py

@@ -0,0 +1,805 @@
+# Xmethods for libstdc++.
+
+# Copyright (C) 2014-2021 Free Software Foundation, Inc.
+
+# 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 3 of the License, or
+# (at your option) any later version.
+#
+# 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/>.
+
+import gdb
+import gdb.xmethod
+import re
+
+matcher_name_prefix = 'libstdc++::'
+
+def get_bool_type():
+    return gdb.lookup_type('bool')
+
+def get_std_size_type():
+    return gdb.lookup_type('std::size_t')
+
+class LibStdCxxXMethod(gdb.xmethod.XMethod):
+    def __init__(self, name, worker_class):
+        gdb.xmethod.XMethod.__init__(self, name)
+        self.worker_class = worker_class
+
+# Xmethods for std::array
+
+class ArrayWorkerBase(gdb.xmethod.XMethodWorker):
+    def __init__(self, val_type, size):
+        self._val_type = val_type
+        self._size = size
+
+    def null_value(self):
+        nullptr = gdb.parse_and_eval('(void *) 0')
+        return nullptr.cast(self._val_type.pointer()).dereference()
+
+class ArraySizeWorker(ArrayWorkerBase):
+    def __init__(self, val_type, size):
+        ArrayWorkerBase.__init__(self, val_type, size)
+
+    def get_arg_types(self):
+        return None
+
+    def get_result_type(self, obj):
+        return get_std_size_type()
+
+    def __call__(self, obj):
+        return self._size
+
+class ArrayEmptyWorker(ArrayWorkerBase):
+    def __init__(self, val_type, size):
+        ArrayWorkerBase.__init__(self, val_type, size)
+
+    def get_arg_types(self):
+        return None
+
+    def get_result_type(self, obj):
+        return get_bool_type()
+
+    def __call__(self, obj):
+        return (int(self._size) == 0)
+
+class ArrayFrontWorker(ArrayWorkerBase):
+    def __init__(self, val_type, size):
+        ArrayWorkerBase.__init__(self, val_type, size)
+
+    def get_arg_types(self):
+        return None
+
+    def get_result_type(self, obj):
+        return self._val_type
+
+    def __call__(self, obj):
+        if int(self._size) > 0:
+            return obj['_M_elems'][0]
+        else:
+            return self.null_value()
+
+class ArrayBackWorker(ArrayWorkerBase):
+    def __init__(self, val_type, size):
+        ArrayWorkerBase.__init__(self, val_type, size)
+
+    def get_arg_types(self):
+        return None
+
+    def get_result_type(self, obj):
+        return self._val_type
+
+    def __call__(self, obj):
+        if int(self._size) > 0:
+            return obj['_M_elems'][self._size - 1]
+        else:
+            return self.null_value()
+
+class ArrayAtWorker(ArrayWorkerBase):
+    def __init__(self, val_type, size):
+        ArrayWorkerBase.__init__(self, val_type, size)
+
+    def get_arg_types(self):
+        return get_std_size_type()
+
+    def get_result_type(self, obj, index):
+        return self._val_type
+
+    def __call__(self, obj, index):
+        if int(index) >= int(self._size):
+            raise IndexError('Array index "%d" should not be >= %d.' %
+                             ((int(index), self._size)))
+        return obj['_M_elems'][index]
+
+class ArraySubscriptWorker(ArrayWorkerBase):
+    def __init__(self, val_type, size):
+        ArrayWorkerBase.__init__(self, val_type, size)
+
+    def get_arg_types(self):
+        return get_std_size_type()
+
+    def get_result_type(self, obj, index):
+        return self._val_type
+
+    def __call__(self, obj, index):
+        if int(self._size) > 0:
+            return obj['_M_elems'][index]
+        else:
+            return self.null_value()
+
+class ArrayMethodsMatcher(gdb.xmethod.XMethodMatcher):
+    def __init__(self):
+        gdb.xmethod.XMethodMatcher.__init__(self,
+                                            matcher_name_prefix + 'array')
+        self._method_dict = {
+            'size': LibStdCxxXMethod('size', ArraySizeWorker),
+            'empty': LibStdCxxXMethod('empty', ArrayEmptyWorker),
+            'front': LibStdCxxXMethod('front', ArrayFrontWorker),
+            'back': LibStdCxxXMethod('back', ArrayBackWorker),
+            'at': LibStdCxxXMethod('at', ArrayAtWorker),
+            'operator[]': LibStdCxxXMethod('operator[]', ArraySubscriptWorker),
+        }
+        self.methods = [self._method_dict[m] for m in self._method_dict]
+
+    def match(self, class_type, method_name):
+        if not re.match('^std::(__\d+::)?array<.*>$', class_type.tag):
+            return None
+        method = self._method_dict.get(method_name)
+        if method is None or not method.enabled:
+            return None
+        try:
+            value_type = class_type.template_argument(0)
+            size = class_type.template_argument(1)
+        except:
+            return None
+        return method.worker_class(value_type, size)
+
+# Xmethods for std::deque
+
+class DequeWorkerBase(gdb.xmethod.XMethodWorker):
+    def __init__(self, val_type):
+        self._val_type = val_type
+        self._bufsize = 512 // val_type.sizeof or 1
+
+    def size(self, obj):
+        first_node = obj['_M_impl']['_M_start']['_M_node']
+        last_node = obj['_M_impl']['_M_finish']['_M_node']
+        cur = obj['_M_impl']['_M_finish']['_M_cur']
+        first = obj['_M_impl']['_M_finish']['_M_first']
+        return (last_node - first_node) * self._bufsize + (cur - first)
+
+    def index(self, obj, idx):
+        first_node = obj['_M_impl']['_M_start']['_M_node']
+        index_node = first_node + int(idx) // self._bufsize
+        return index_node[0][idx % self._bufsize]
+
+class DequeEmptyWorker(DequeWorkerBase):
+    def get_arg_types(self):
+        return None
+
+    def get_result_type(self, obj):
+        return get_bool_type()
+
+    def __call__(self, obj):
+        return (obj['_M_impl']['_M_start']['_M_cur'] ==
+                obj['_M_impl']['_M_finish']['_M_cur'])
+
+class DequeSizeWorker(DequeWorkerBase):
+    def get_arg_types(self):
+        return None
+
+    def get_result_type(self, obj):
+        return get_std_size_type()
+
+    def __call__(self, obj):
+        return self.size(obj)
+
+class DequeFrontWorker(DequeWorkerBase):
+    def get_arg_types(self):
+        return None
+
+    def get_result_type(self, obj):
+        return self._val_type
+
+    def __call__(self, obj):
+        return obj['_M_impl']['_M_start']['_M_cur'][0]
+
+class DequeBackWorker(DequeWorkerBase):
+    def get_arg_types(self):
+        return None
+
+    def get_result_type(self, obj):
+        return self._val_type
+
+    def __call__(self, obj):
+        if (obj['_M_impl']['_M_finish']['_M_cur'] ==
+            obj['_M_impl']['_M_finish']['_M_first']):
+            prev_node = obj['_M_impl']['_M_finish']['_M_node'] - 1
+            return prev_node[0][self._bufsize - 1]
+        else:
+            return obj['_M_impl']['_M_finish']['_M_cur'][-1]
+
+class DequeSubscriptWorker(DequeWorkerBase):
+    def get_arg_types(self):
+        return get_std_size_type()
+
+    def get_result_type(self, obj, subscript):
+        return self._val_type
+
+    def __call__(self, obj, subscript):
+        return self.index(obj, subscript)
+
+class DequeAtWorker(DequeWorkerBase):
+    def get_arg_types(self):
+        return get_std_size_type()
+
+    def get_result_type(self, obj, index):
+        return self._val_type
+
+    def __call__(self, obj, index):
+        deque_size = int(self.size(obj))
+        if int(index) >= deque_size:
+            raise IndexError('Deque index "%d" should not be >= %d.' %
+                             (int(index), deque_size))
+        else:
+           return self.index(obj, index)
+
+class DequeMethodsMatcher(gdb.xmethod.XMethodMatcher):
+    def __init__(self):
+        gdb.xmethod.XMethodMatcher.__init__(self,
+                                            matcher_name_prefix + 'deque')
+        self._method_dict = {
+            'empty': LibStdCxxXMethod('empty', DequeEmptyWorker),
+            'size': LibStdCxxXMethod('size', DequeSizeWorker),
+            'front': LibStdCxxXMethod('front', DequeFrontWorker),
+            'back': LibStdCxxXMethod('back', DequeBackWorker),
+            'operator[]': LibStdCxxXMethod('operator[]', DequeSubscriptWorker),
+            'at': LibStdCxxXMethod('at', DequeAtWorker)
+        }
+        self.methods = [self._method_dict[m] for m in self._method_dict]
+
+    def match(self, class_type, method_name):
+        if not re.match('^std::(__\d+::)?deque<.*>$', class_type.tag):
+            return None
+        method = self._method_dict.get(method_name)
+        if method is None or not method.enabled:
+            return None
+        return method.worker_class(class_type.template_argument(0))
+
+# Xmethods for std::forward_list
+
+class ForwardListWorkerBase(gdb.xmethod.XMethodMatcher):
+    def __init__(self, val_type, node_type):
+        self._val_type = val_type
+        self._node_type = node_type
+
+    def get_arg_types(self):
+        return None
+
+class ForwardListEmptyWorker(ForwardListWorkerBase):
+    def get_result_type(self, obj):
+        return get_bool_type()
+
+    def __call__(self, obj):
+        return obj['_M_impl']['_M_head']['_M_next'] == 0
+
+class ForwardListFrontWorker(ForwardListWorkerBase):
+    def get_result_type(self, obj):
+        return self._val_type
+
+    def __call__(self, obj):
+        node = obj['_M_impl']['_M_head']['_M_next'].cast(self._node_type)
+        val_address = node['_M_storage']['_M_storage'].address
+        return val_address.cast(self._val_type.pointer()).dereference()
+
+class ForwardListMethodsMatcher(gdb.xmethod.XMethodMatcher):
+    def __init__(self):
+        matcher_name = matcher_name_prefix + 'forward_list'
+        gdb.xmethod.XMethodMatcher.__init__(self, matcher_name)
+        self._method_dict = {
+            'empty': LibStdCxxXMethod('empty', ForwardListEmptyWorker),
+            'front': LibStdCxxXMethod('front', ForwardListFrontWorker)
+        }
+        self.methods = [self._method_dict[m] for m in self._method_dict]
+
+    def match(self, class_type, method_name):
+        if not re.match('^std::(__\d+::)?forward_list<.*>$', class_type.tag):
+            return None
+        method = self._method_dict.get(method_name)
+        if method is None or not method.enabled:
+            return None
+        val_type = class_type.template_argument(0)
+        node_type = gdb.lookup_type(str(class_type) + '::_Node').pointer()
+        return method.worker_class(val_type, node_type)
+
+# Xmethods for std::list
+
+class ListWorkerBase(gdb.xmethod.XMethodWorker):
+    def __init__(self, val_type, node_type):
+        self._val_type = val_type
+        self._node_type = node_type
+
+    def get_arg_types(self):
+        return None
+
+    def get_value_from_node(self, node):
+        node = node.dereference()
+        if node.type.fields()[1].name == '_M_data':
+            # C++03 implementation, node contains the value as a member
+            return node['_M_data']
+        # C++11 implementation, node stores value in __aligned_membuf
+        addr = node['_M_storage'].address
+        return addr.cast(self._val_type.pointer()).dereference()
+
+class ListEmptyWorker(ListWorkerBase):
+    def get_result_type(self, obj):
+        return get_bool_type()
+
+    def __call__(self, obj):
+        base_node = obj['_M_impl']['_M_node']
+        if base_node['_M_next'] == base_node.address:
+            return True
+        else:
+            return False
+
+class ListSizeWorker(ListWorkerBase):
+    def get_result_type(self, obj):
+        return get_std_size_type()
+
+    def __call__(self, obj):
+        begin_node = obj['_M_impl']['_M_node']['_M_next']
+        end_node = obj['_M_impl']['_M_node'].address
+        size = 0
+        while begin_node != end_node:
+            begin_node = begin_node['_M_next']
+            size += 1
+        return size
+
+class ListFrontWorker(ListWorkerBase):
+    def get_result_type(self, obj):
+        return self._val_type
+
+    def __call__(self, obj):
+        node = obj['_M_impl']['_M_node']['_M_next'].cast(self._node_type)
+        return self.get_value_from_node(node)
+
+class ListBackWorker(ListWorkerBase):
+    def get_result_type(self, obj):
+        return self._val_type
+
+    def __call__(self, obj):
+        prev_node = obj['_M_impl']['_M_node']['_M_prev'].cast(self._node_type)
+        return self.get_value_from_node(prev_node)
+
+class ListMethodsMatcher(gdb.xmethod.XMethodMatcher):
+    def __init__(self):
+        gdb.xmethod.XMethodMatcher.__init__(self,
+                                            matcher_name_prefix + 'list')
+        self._method_dict = {
+            'empty': LibStdCxxXMethod('empty', ListEmptyWorker),
+            'size': LibStdCxxXMethod('size', ListSizeWorker),
+            'front': LibStdCxxXMethod('front', ListFrontWorker),
+            'back': LibStdCxxXMethod('back', ListBackWorker)
+        }
+        self.methods = [self._method_dict[m] for m in self._method_dict]
+
+    def match(self, class_type, method_name):
+        if not re.match('^std::(__\d+::)?(__cxx11::)?list<.*>$', class_type.tag):
+            return None
+        method = self._method_dict.get(method_name)
+        if method is None or not method.enabled:
+            return None
+        val_type = class_type.template_argument(0)
+        node_type = gdb.lookup_type(str(class_type) + '::_Node').pointer()
+        return method.worker_class(val_type, node_type)
+
+# Xmethods for std::vector
+
+class VectorWorkerBase(gdb.xmethod.XMethodWorker):
+    def __init__(self, val_type):
+        self._val_type = val_type
+
+    def size(self, obj):
+        if self._val_type.code == gdb.TYPE_CODE_BOOL:
+            start = obj['_M_impl']['_M_start']['_M_p']
+            finish = obj['_M_impl']['_M_finish']['_M_p']
+            finish_offset = obj['_M_impl']['_M_finish']['_M_offset']
+            bit_size = start.dereference().type.sizeof * 8
+            return (finish - start) * bit_size + finish_offset
+        else:
+            return obj['_M_impl']['_M_finish'] - obj['_M_impl']['_M_start']
+
+    def get(self, obj, index):
+        if self._val_type.code == gdb.TYPE_CODE_BOOL:
+            start = obj['_M_impl']['_M_start']['_M_p']
+            bit_size = start.dereference().type.sizeof * 8
+            valp = start + index // bit_size
+            offset = index % bit_size
+            return (valp.dereference() & (1 << offset)) > 0
+        else:
+            return obj['_M_impl']['_M_start'][index]
+
+class VectorEmptyWorker(VectorWorkerBase):
+    def get_arg_types(self):
+        return None
+
+    def get_result_type(self, obj):
+        return get_bool_type()
+
+    def __call__(self, obj):
+        return int(self.size(obj)) == 0
+
+class VectorSizeWorker(VectorWorkerBase):
+    def get_arg_types(self):
+        return None
+
+    def get_result_type(self, obj):
+        return get_std_size_type()
+
+    def __call__(self, obj):
+        return self.size(obj)
+
+class VectorFrontWorker(VectorWorkerBase):
+    def get_arg_types(self):
+        return None
+
+    def get_result_type(self, obj):
+        return self._val_type
+
+    def __call__(self, obj):
+        return self.get(obj, 0)
+
+class VectorBackWorker(VectorWorkerBase):
+    def get_arg_types(self):
+        return None
+
+    def get_result_type(self, obj):
+        return self._val_type
+
+    def __call__(self, obj):
+        return self.get(obj, int(self.size(obj)) - 1)
+
+class VectorAtWorker(VectorWorkerBase):
+    def get_arg_types(self):
+        return get_std_size_type()
+
+    def get_result_type(self, obj, index):
+        return self._val_type
+
+    def __call__(self, obj, index):
+        size = int(self.size(obj))
+        if int(index) >= size:
+            raise IndexError('Vector index "%d" should not be >= %d.' %
+                             ((int(index), size)))
+        return self.get(obj, int(index))
+
+class VectorSubscriptWorker(VectorWorkerBase):
+    def get_arg_types(self):
+        return get_std_size_type()
+
+    def get_result_type(self, obj, subscript):
+        return self._val_type
+
+    def __call__(self, obj, subscript):
+        return self.get(obj, int(subscript))
+
+class VectorMethodsMatcher(gdb.xmethod.XMethodMatcher):
+    def __init__(self):
+        gdb.xmethod.XMethodMatcher.__init__(self,
+                                            matcher_name_prefix + 'vector')
+        self._method_dict = {
+            'size': LibStdCxxXMethod('size', VectorSizeWorker),
+            'empty': LibStdCxxXMethod('empty', VectorEmptyWorker),
+            'front': LibStdCxxXMethod('front', VectorFrontWorker),
+            'back': LibStdCxxXMethod('back', VectorBackWorker),
+            'at': LibStdCxxXMethod('at', VectorAtWorker),
+            'operator[]': LibStdCxxXMethod('operator[]',
+                                           VectorSubscriptWorker),
+        }
+        self.methods = [self._method_dict[m] for m in self._method_dict]
+
+    def match(self, class_type, method_name):
+        if not re.match('^std::(__\d+::)?vector<.*>$', class_type.tag):
+            return None
+        method = self._method_dict.get(method_name)
+        if method is None or not method.enabled:
+            return None
+        return method.worker_class(class_type.template_argument(0))
+
+# Xmethods for associative containers
+
+class AssociativeContainerWorkerBase(gdb.xmethod.XMethodWorker):
+    def __init__(self, unordered):
+        self._unordered = unordered
+
+    def node_count(self, obj):
+        if self._unordered:
+            return obj['_M_h']['_M_element_count']
+        else:
+            return obj['_M_t']['_M_impl']['_M_node_count']
+
+    def get_arg_types(self):
+        return None
+
+class AssociativeContainerEmptyWorker(AssociativeContainerWorkerBase):
+    def get_result_type(self, obj):
+        return get_bool_type()
+
+    def __call__(self, obj):
+        return int(self.node_count(obj)) == 0
+
+class AssociativeContainerSizeWorker(AssociativeContainerWorkerBase):
+    def get_result_type(self, obj):
+        return get_std_size_type()
+
+    def __call__(self, obj):
+        return self.node_count(obj)
+
+class AssociativeContainerMethodsMatcher(gdb.xmethod.XMethodMatcher):
+    def __init__(self, name):
+        gdb.xmethod.XMethodMatcher.__init__(self,
+                                            matcher_name_prefix + name)
+        self._name = name
+        self._method_dict = {
+            'size': LibStdCxxXMethod('size', AssociativeContainerSizeWorker),
+            'empty': LibStdCxxXMethod('empty',
+                                      AssociativeContainerEmptyWorker),
+        }
+        self.methods = [self._method_dict[m] for m in self._method_dict]
+
+    def match(self, class_type, method_name):
+        if not re.match('^std::(__\d+::)?%s<.*>$' % self._name, class_type.tag):
+            return None
+        method = self._method_dict.get(method_name)
+        if method is None or not method.enabled:
+            return None
+        unordered = 'unordered' in self._name
+        return method.worker_class(unordered)
+
+# Xmethods for std::unique_ptr
+
+class UniquePtrGetWorker(gdb.xmethod.XMethodWorker):
+    "Implements std::unique_ptr<T>::get() and std::unique_ptr<T>::operator->()"
+
+    def __init__(self, elem_type):
+        self._is_array = elem_type.code == gdb.TYPE_CODE_ARRAY
+        if self._is_array:
+            self._elem_type = elem_type.target()
+        else:
+            self._elem_type = elem_type
+
+    def get_arg_types(self):
+        return None
+
+    def get_result_type(self, obj):
+        return self._elem_type.pointer()
+
+    def _supports(self, method_name):
+        "operator-> is not supported for unique_ptr<T[]>"
+        return method_name == 'get' or not self._is_array
+
+    def __call__(self, obj):
+        impl_type = obj.dereference().type.fields()[0].type.tag
+        # Check for new implementations first:
+        if re.match('^std::(__\d+::)?__uniq_ptr_(data|impl)<.*>$', impl_type):
+            tuple_member = obj['_M_t']['_M_t']
+        elif re.match('^std::(__\d+::)?tuple<.*>$', impl_type):
+            tuple_member = obj['_M_t']
+        else:
+            return None
+        tuple_impl_type = tuple_member.type.fields()[0].type # _Tuple_impl
+        tuple_head_type = tuple_impl_type.fields()[1].type   # _Head_base
+        head_field = tuple_head_type.fields()[0]
+        if head_field.name == '_M_head_impl':
+            return tuple_member['_M_head_impl']
+        elif head_field.is_base_class:
+            return tuple_member.cast(head_field.type)
+        else:
+            return None
+
+class UniquePtrDerefWorker(UniquePtrGetWorker):
+    "Implements std::unique_ptr<T>::operator*()"
+
+    def __init__(self, elem_type):
+        UniquePtrGetWorker.__init__(self, elem_type)
+
+    def get_result_type(self, obj):
+        return self._elem_type
+
+    def _supports(self, method_name):
+        "operator* is not supported for unique_ptr<T[]>"
+        return not self._is_array
+
+    def __call__(self, obj):
+        return UniquePtrGetWorker.__call__(self, obj).dereference()
+
+class UniquePtrSubscriptWorker(UniquePtrGetWorker):
+    "Implements std::unique_ptr<T>::operator[](size_t)"
+
+    def __init__(self, elem_type):
+        UniquePtrGetWorker.__init__(self, elem_type)
+
+    def get_arg_types(self):
+        return get_std_size_type()
+
+    def get_result_type(self, obj, index):
+        return self._elem_type
+
+    def _supports(self, method_name):
+        "operator[] is only supported for unique_ptr<T[]>"
+        return self._is_array
+
+    def __call__(self, obj, index):
+        return UniquePtrGetWorker.__call__(self, obj)[index]
+
+class UniquePtrMethodsMatcher(gdb.xmethod.XMethodMatcher):
+    def __init__(self):
+        gdb.xmethod.XMethodMatcher.__init__(self,
+                                            matcher_name_prefix + 'unique_ptr')
+        self._method_dict = {
+            'get': LibStdCxxXMethod('get', UniquePtrGetWorker),
+            'operator->': LibStdCxxXMethod('operator->', UniquePtrGetWorker),
+            'operator*': LibStdCxxXMethod('operator*', UniquePtrDerefWorker),
+            'operator[]': LibStdCxxXMethod('operator[]', UniquePtrSubscriptWorker),
+        }
+        self.methods = [self._method_dict[m] for m in self._method_dict]
+
+    def match(self, class_type, method_name):
+        if not re.match('^std::(__\d+::)?unique_ptr<.*>$', class_type.tag):
+            return None
+        method = self._method_dict.get(method_name)
+        if method is None or not method.enabled:
+            return None
+        worker = method.worker_class(class_type.template_argument(0))
+        if worker._supports(method_name):
+            return worker
+        return None
+
+# Xmethods for std::shared_ptr
+
+class SharedPtrGetWorker(gdb.xmethod.XMethodWorker):
+    "Implements std::shared_ptr<T>::get() and std::shared_ptr<T>::operator->()"
+
+    def __init__(self, elem_type):
+        self._is_array = elem_type.code == gdb.TYPE_CODE_ARRAY
+        if self._is_array:
+            self._elem_type = elem_type.target()
+        else:
+            self._elem_type = elem_type
+
+    def get_arg_types(self):
+        return None
+
+    def get_result_type(self, obj):
+        return self._elem_type.pointer()
+
+    def _supports(self, method_name):
+        "operator-> is not supported for shared_ptr<T[]>"
+        return method_name == 'get' or not self._is_array
+
+    def __call__(self, obj):
+        return obj['_M_ptr']
+
+class SharedPtrDerefWorker(SharedPtrGetWorker):
+    "Implements std::shared_ptr<T>::operator*()"
+
+    def __init__(self, elem_type):
+        SharedPtrGetWorker.__init__(self, elem_type)
+
+    def get_result_type(self, obj):
+        return self._elem_type
+
+    def _supports(self, method_name):
+        "operator* is not supported for shared_ptr<T[]>"
+        return not self._is_array
+
+    def __call__(self, obj):
+        return SharedPtrGetWorker.__call__(self, obj).dereference()
+
+class SharedPtrSubscriptWorker(SharedPtrGetWorker):
+    "Implements std::shared_ptr<T>::operator[](size_t)"
+
+    def __init__(self, elem_type):
+        SharedPtrGetWorker.__init__(self, elem_type)
+
+    def get_arg_types(self):
+        return get_std_size_type()
+
+    def get_result_type(self, obj, index):
+        return self._elem_type
+
+    def _supports(self, method_name):
+        "operator[] is only supported for shared_ptr<T[]>"
+        return self._is_array
+
+    def __call__(self, obj, index):
+        # Check bounds if _elem_type is an array of known bound
+        m = re.match('.*\[(\d+)]$', str(self._elem_type))
+        if m and index >= int(m.group(1)):
+            raise IndexError('shared_ptr<%s> index "%d" should not be >= %d.' %
+                             (self._elem_type, int(index), int(m.group(1))))
+        return SharedPtrGetWorker.__call__(self, obj)[index]
+
+class SharedPtrUseCountWorker(gdb.xmethod.XMethodWorker):
+    "Implements std::shared_ptr<T>::use_count()"
+
+    def __init__(self, elem_type):
+        SharedPtrUseCountWorker.__init__(self, elem_type)
+
+    def get_arg_types(self):
+        return None
+
+    def get_result_type(self, obj):
+        return gdb.lookup_type('long')
+
+    def __call__(self, obj):
+        refcounts = obj['_M_refcount']['_M_pi']
+        return refcounts['_M_use_count'] if refcounts else 0
+
+class SharedPtrUniqueWorker(SharedPtrUseCountWorker):
+    "Implements std::shared_ptr<T>::unique()"
+
+    def __init__(self, elem_type):
+        SharedPtrUseCountWorker.__init__(self, elem_type)
+
+    def get_result_type(self, obj):
+        return gdb.lookup_type('bool')
+
+    def __call__(self, obj):
+        return SharedPtrUseCountWorker.__call__(self, obj) == 1
+
+class SharedPtrMethodsMatcher(gdb.xmethod.XMethodMatcher):
+    def __init__(self):
+        gdb.xmethod.XMethodMatcher.__init__(self,
+                                            matcher_name_prefix + 'shared_ptr')
+        self._method_dict = {
+            'get': LibStdCxxXMethod('get', SharedPtrGetWorker),
+            'operator->': LibStdCxxXMethod('operator->', SharedPtrGetWorker),
+            'operator*': LibStdCxxXMethod('operator*', SharedPtrDerefWorker),
+            'operator[]': LibStdCxxXMethod('operator[]', SharedPtrSubscriptWorker),
+            'use_count': LibStdCxxXMethod('use_count', SharedPtrUseCountWorker),
+            'unique': LibStdCxxXMethod('unique', SharedPtrUniqueWorker),
+        }
+        self.methods = [self._method_dict[m] for m in self._method_dict]
+
+    def match(self, class_type, method_name):
+        if not re.match('^std::(__\d+::)?shared_ptr<.*>$', class_type.tag):
+            return None
+        method = self._method_dict.get(method_name)
+        if method is None or not method.enabled:
+            return None
+        worker = method.worker_class(class_type.template_argument(0))
+        if worker._supports(method_name):
+            return worker
+        return None
+
+def register_libstdcxx_xmethods(locus):
+    gdb.xmethod.register_xmethod_matcher(locus, ArrayMethodsMatcher())
+    gdb.xmethod.register_xmethod_matcher(locus, ForwardListMethodsMatcher())
+    gdb.xmethod.register_xmethod_matcher(locus, DequeMethodsMatcher())
+    gdb.xmethod.register_xmethod_matcher(locus, ListMethodsMatcher())
+    gdb.xmethod.register_xmethod_matcher(locus, VectorMethodsMatcher())
+    gdb.xmethod.register_xmethod_matcher(
+        locus, AssociativeContainerMethodsMatcher('set'))
+    gdb.xmethod.register_xmethod_matcher(
+        locus, AssociativeContainerMethodsMatcher('map'))
+    gdb.xmethod.register_xmethod_matcher(
+        locus, AssociativeContainerMethodsMatcher('multiset'))
+    gdb.xmethod.register_xmethod_matcher(
+        locus, AssociativeContainerMethodsMatcher('multimap'))
+    gdb.xmethod.register_xmethod_matcher(
+        locus, AssociativeContainerMethodsMatcher('unordered_set'))
+    gdb.xmethod.register_xmethod_matcher(
+        locus, AssociativeContainerMethodsMatcher('unordered_map'))
+    gdb.xmethod.register_xmethod_matcher(
+        locus, AssociativeContainerMethodsMatcher('unordered_multiset'))
+    gdb.xmethod.register_xmethod_matcher(
+        locus, AssociativeContainerMethodsMatcher('unordered_multimap'))
+    gdb.xmethod.register_xmethod_matcher(locus, UniquePtrMethodsMatcher())
+    gdb.xmethod.register_xmethod_matcher(locus, SharedPtrMethodsMatcher())