| // Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| #include "vm/canonical_tables.h" |
| |
| namespace dart { |
| |
| bool MetadataMapTraits::IsMatch(const Object& a, const Object& b) { |
| // In the absence of hot reload, this can just be an identity check. With |
| // reload, some old program elements may be retained by the stack, closures |
| // or mirrors, which are absent from the new version of the library's |
| // metadata table. This name-based matching fuzzy maps the old program |
| // elements to corresponding new elements, preserving the behavior of the old |
| // metaname+fields scheme. |
| if (a.IsLibrary() && b.IsLibrary()) { |
| const String& url_a = String::Handle(Library::Cast(a).url()); |
| const String& url_b = String::Handle(Library::Cast(b).url()); |
| return url_a.Equals(url_b); |
| } else if (a.IsClass() && b.IsClass()) { |
| const String& name_a = String::Handle(Class::Cast(a).Name()); |
| const String& name_b = String::Handle(Class::Cast(b).Name()); |
| return name_a.Equals(name_b); |
| } else if (a.IsFunction() && b.IsFunction()) { |
| const String& name_a = String::Handle(Function::Cast(a).name()); |
| const String& name_b = String::Handle(Function::Cast(b).name()); |
| if (!name_a.Equals(name_b)) { |
| return false; |
| } |
| const Object& owner_a = Object::Handle(Function::Cast(a).Owner()); |
| const Object& owner_b = Object::Handle(Function::Cast(b).Owner()); |
| return IsMatch(owner_a, owner_b); |
| } else if (a.IsField() && b.IsField()) { |
| const String& name_a = String::Handle(Field::Cast(a).name()); |
| const String& name_b = String::Handle(Field::Cast(b).name()); |
| if (!name_a.Equals(name_b)) { |
| return false; |
| } |
| const Object& owner_a = Object::Handle(Field::Cast(a).Owner()); |
| const Object& owner_b = Object::Handle(Field::Cast(b).Owner()); |
| return IsMatch(owner_a, owner_b); |
| } else if (a.IsTypeParameter() && b.IsTypeParameter()) { |
| if (TypeParameter::Cast(a).index() != TypeParameter::Cast(b).index() || |
| TypeParameter::Cast(a).base() != TypeParameter::Cast(b).base()) { |
| return false; |
| } |
| return TypeParameter::Cast(a).parameterized_class_id() == |
| TypeParameter::Cast(b).parameterized_class_id(); |
| } |
| return a.ptr() == b.ptr(); |
| } |
| |
| uword MetadataMapTraits::Hash(const Object& key) { |
| if (key.IsLibrary()) { |
| return String::Hash(Library::Cast(key).url()); |
| } else if (key.IsClass()) { |
| return String::Hash(Class::Cast(key).Name()); |
| } else if (key.IsFunction()) { |
| return CombineHashes(String::Hash(Function::Cast(key).name()), |
| Hash(Object::Handle(Function::Cast(key).Owner()))); |
| } else if (key.IsField()) { |
| return CombineHashes(String::Hash(Field::Cast(key).name()), |
| Hash(Object::Handle(Field::Cast(key).Owner()))); |
| } else if (key.IsTypeParameter()) { |
| return TypeParameter::Cast(key).Hash(); |
| } else if (key.IsNamespace()) { |
| return Hash(Library::Handle(Namespace::Cast(key).target())); |
| } |
| UNREACHABLE(); |
| } |
| |
| } // namespace dart |