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# Xmethods for libstdc++. # Copyright (C) 2014-2022 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.cast(tuple_head_type)['_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+)]$', str(self._elem_type)) if m and index >= int(m.group(1)): raise IndexError('shared_ptr<%s> index "%d" should not be >= %d.' % (self._elem_type, int(index), int(m.group(1)))) return SharedPtrGetWorker.__call__(self, obj)[index] class SharedPtrUseCountWorker(gdb.xmethod.XMethodWorker): "Implements std::shared_ptr<T>::use_count()" def __init__(self, elem_type): pass def get_arg_types(self): return None def get_result_type(self, obj): return gdb.lookup_type('long') def _supports(self, method_name): return True def __call__(self, obj): refcounts = obj['_M_refcount']['_M_pi'] return refcounts['_M_use_count'] if refcounts else 0 class SharedPtrUniqueWorker(SharedPtrUseCountWorker): "Implements std::shared_ptr<T>::unique()" def __init__(self, elem_type): SharedPtrUseCountWorker.__init__(self, elem_type) def get_result_type(self, obj): return gdb.lookup_type('bool') def __call__(self, obj): return SharedPtrUseCountWorker.__call__(self, obj) == 1 class SharedPtrMethodsMatcher(gdb.xmethod.XMethodMatcher): def __init__(self): gdb.xmethod.XMethodMatcher.__init__(self, matcher_name_prefix + 'shared_ptr') self._method_dict = { 'get': LibStdCxxXMethod('get', SharedPtrGetWorker), 'operator->': LibStdCxxXMethod('operator->', SharedPtrGetWorker), 'operator*': LibStdCxxXMethod('operator*', SharedPtrDerefWorker), 'operator[]': LibStdCxxXMethod('operator[]', SharedPtrSubscriptWorker), 'use_count': LibStdCxxXMethod('use_count', SharedPtrUseCountWorker), 'unique': LibStdCxxXMethod('unique', SharedPtrUniqueWorker), } self.methods = [self._method_dict[m] for m in self._method_dict] def match(self, class_type, method_name): if not re.match('^std::(__\d+::)?shared_ptr<.*>$', 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())
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