mirror of
https://github.com/JakeHillion/object-introspection.git
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80 lines
2.3 KiB
C++
80 lines
2.3 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <functional>
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#include <unordered_set>
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#include <vector>
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#include "PassManager.h"
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#include "Types.h"
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#include "Visitor.h"
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struct drgn_type;
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namespace oi::detail {
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class SymbolService;
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}
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namespace oi::detail::type_graph {
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class DrgnParser;
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class TypeGraph;
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/*
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* AddChildren
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*
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* Populates the "children" field of Class types.
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*
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* DWARF only stores a mapping of [child -> parent], but sometimes we want the
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* invserse: [parent -> child]. We must iterate over every single type to build
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* up our own inverse mapping, before applying it to the relevant type nodes.
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*
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* This is expensive and only useful for types which make use of dynamic
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* inheritance hierarchies (e.g. polymorphism), so is not done as part of the
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* standard DrgnParser stage.
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*/
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class AddChildren final : public RecursiveVisitor {
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public:
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static Pass createPass(DrgnParser& drgnParser, SymbolService& symbols);
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AddChildren(TypeGraph& typeGraph, DrgnParser& drgnParser)
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: typeGraph_(typeGraph), drgnParser_(drgnParser) {
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}
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using RecursiveVisitor::accept;
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void accept(Type& type) override;
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void visit(Class& c) override;
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private:
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void enumerateChildClasses(SymbolService& symbols);
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void enumerateClassChildren(
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struct drgn_type* type,
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std::vector<std::reference_wrapper<Class>>& children);
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void recordChildren(drgn_type* type);
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std::unordered_set<Type*> visited_;
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TypeGraph& typeGraph_;
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DrgnParser& drgnParser_;
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// Mapping of parent classes to child classes, using names for keys, as drgn
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// pointers returned from a type iterator will not match those returned from
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// enumerating types in the normal way.
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std::unordered_map<std::string, std::vector<drgn_type*>> childClasses_;
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};
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} // namespace oi::detail::type_graph
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