mirror of
https://github.com/JakeHillion/object-introspection.git
synced 2024-11-09 21:24:14 +00:00
89b230395f
Summary: tbv2: remove unnecessary copy in Element `IntrospectionResult::const_iterator` iterates through the `Element`s in an `IntrospectionResult`. `Element` currently copies the `type_path` which is a `std::vector<string_view>` every time the iterator is incremented. This is unnecessary as the data in the vector only changes slightly between iterations. This change changes the `type_path` field in `Element` to a `std::span<const std::string_view>`. Doing this previously caused SEGVs because of the iterator's potential to be copied. To make it possible we do two things: 1. Make all copies explicit using a clone interface as in `ContainerInfo`. This prevents accidental copies of an expensive structure. 2. After calling the copy constructor in `clone()` update the `span` in `next_` to point at the newly copied structure. Moves are fine because the `span` points at the allocation of the `vector`, not the vector itself. Test Plan: - CI - `FILTER='OilIntegration.*' make test` - Ran `OilgenIntegration.std_vector_vector_int_some` which SEGVd with the `span` change before and now doesn't. This now passes cleanly with ASAN enabled on the target, though isn't available in `main` (only works on my machine). Differential Revision: D53472595 Pulled By: JakeHillion
97 lines
2.8 KiB
C++
97 lines
2.8 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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#ifndef INCLUDED_OI_INTROSPECTIONRESULT_H
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#define INCLUDED_OI_INTROSPECTIONRESULT_H 1
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#include <oi/exporters/inst.h>
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#include <oi/result/Element.h>
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#include <oi/types/dy.h>
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#include <cstdint>
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#include <list>
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#include <optional>
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#include <span>
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#include <stack>
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#include <string_view>
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#include <vector>
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namespace oi {
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class IntrospectionResult {
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public:
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class const_iterator {
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friend class IntrospectionResult;
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public:
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bool operator==(const const_iterator& that) const;
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bool operator!=(const const_iterator& that) const;
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const result::Element& operator*() const;
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const result::Element* operator->() const;
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const_iterator& operator++();
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const_iterator operator++(int);
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private:
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const_iterator(const const_iterator&) = default;
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const_iterator& operator=(const const_iterator& other) = default;
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public:
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const_iterator(const_iterator&&) = default;
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const_iterator& operator=(const_iterator&&) = default;
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// Explicit interface for copying
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const_iterator clone() const;
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private:
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using stack_t =
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std::stack<exporters::inst::Inst, std::vector<exporters::inst::Inst>>;
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const_iterator(std::vector<uint8_t>::const_iterator data,
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exporters::inst::Inst type);
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const_iterator(std::vector<uint8_t>::const_iterator data);
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std::vector<uint8_t>::const_iterator data_;
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stack_t stack_;
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std::optional<result::Element> next_;
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std::vector<std::string_view> type_path_;
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// Holds a pair of the type path entry this represents and the owned string
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// that type_path_ has a view of.
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std::list<std::pair<size_t, std::string>> dynamic_type_path_;
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// We cannot track the position in the iteration solely by the underlying
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// iterator as some fields do not extract data (for example, primitives).
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// Track the number of increment operations as well to get an accurate
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// equality check.
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uint64_t increments_ = 0;
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};
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IntrospectionResult(std::vector<uint8_t> buf, exporters::inst::Inst inst);
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const_iterator begin() const;
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const_iterator cbegin() const;
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const_iterator end() const;
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const_iterator cend() const;
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private:
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std::vector<uint8_t> buf_;
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exporters::inst::Inst inst_;
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};
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} // namespace oi
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#include <oi/IntrospectionResult-inl.h>
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#endif
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