diff options
Diffstat (limited to 'source/blender/depsgraph/intern/builder/deg_builder_nodes.cc')
-rw-r--r-- | source/blender/depsgraph/intern/builder/deg_builder_nodes.cc | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/source/blender/depsgraph/intern/builder/deg_builder_nodes.cc b/source/blender/depsgraph/intern/builder/deg_builder_nodes.cc index 01d84f6b5d8..c512300200e 100644 --- a/source/blender/depsgraph/intern/builder/deg_builder_nodes.cc +++ b/source/blender/depsgraph/intern/builder/deg_builder_nodes.cc @@ -319,6 +319,18 @@ void DepsgraphNodeBuilder::begin_build() * them for new ID nodes. */ id_info_hash_ = BLI_ghash_ptr_new("Depsgraph id hash"); for (IDNode *id_node : graph_->id_nodes) { + /* It is possible that the ID does not need to have CoW version in which case id_cow is the + * same as id_orig. Additionally, such ID might have been removed, which makes the check + * for whether id_cow is expanded to access freed memory. In orderr to deal with this we + * check whether CoW is needed based on a scalar value which does not lead to access of + * possibly deleted memory. + * Additionally, this saves some space in the map by skipping mapping for datablocks which + * do not need CoW, */ + if (!deg_copy_on_write_is_needed(id_node->id_type)) { + id_node->id_cow = nullptr; + continue; + } + IDInfo *id_info = (IDInfo *)MEM_mallocN(sizeof(IDInfo), "depsgraph id info"); if (deg_copy_on_write_is_expanded(id_node->id_cow) && id_node->id_orig != id_node->id_cow) { id_info->id_cow = id_node->id_cow; |