mirror of
https://github.com/JakeHillion/object-introspection.git
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125 lines
3.6 KiB
C++
125 lines
3.6 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 <map>
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#include <memory>
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#include <msgpack/sbuffer_decl.hpp>
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#include <optional>
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#include <set>
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#include <string>
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#include <unordered_set>
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#include <vector>
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#include "oi/Features.h"
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#include "oi/TypeHierarchy.h"
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// The rocksdb includes are extremely heavy and bloat compile times,
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// so we just forward-declare `DB` to avoid making other compile units
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// pay the cost of including the relevant headers.
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namespace rocksdb {
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class DB;
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}
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// Forward declared, comes from PaddingInfo.h
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struct PaddingInfo;
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namespace oi::detail {
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class TreeBuilder {
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public:
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struct Config {
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// Don't set default values for the config so the user gets
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// an "unitialized field" warning if he missed any.
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FeatureSet features;
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bool logAllStructs;
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bool dumpDataSegment;
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std::optional<std::string> jsonPath;
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bool strict;
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};
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TreeBuilder(Config);
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~TreeBuilder();
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void build(const std::vector<uint64_t>&,
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const std::string&,
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struct drgn_type*,
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const TypeHierarchy&);
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void dumpJson();
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void setPaddedStructs(std::map<std::string, PaddingInfo>* paddedStructs);
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bool emptyOutput() const;
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private:
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typedef uint64_t Version;
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typedef uint64_t NodeID;
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struct DBHeader;
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struct Node;
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struct Variable;
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const TypeHierarchy* th = nullptr;
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const std::vector<uint64_t>* oidData = nullptr;
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std::map<std::string, PaddingInfo>* paddedStructs = nullptr;
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/*
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* The RocksDB output needs versioning so they are imported correctly in
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* Scuba. Version 1 had no concept of versioning and no header.
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* We currently are at version 2.1:
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* - Introduce the Error ID at index 1023, but don't output it
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* Changelog v2:
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* - Introduce the DBHeader at index 0
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* - Introduce the versioning
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* - Handle multiple root_ids, to import multiple objects in Scuba
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*/
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static constexpr Version VERSION = 2;
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static constexpr NodeID ROOT_NODE_ID = 0;
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static constexpr NodeID ERROR_NODE_ID = 1023;
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static constexpr NodeID FIRST_NODE_ID = 1024;
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/*
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* The first 1024 IDs are reserved for future use.
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* ID 0: DBHeader
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* ID 1023: Error - an error occured while TreeBuilding
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*/
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NodeID nextNodeID = FIRST_NODE_ID;
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const Config config{};
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size_t oidDataIndex;
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std::vector<NodeID> rootIDs{};
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/*
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* Used exclusively by `TreeBuilder::serialize()` to avoid having
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* to allocate a new buffer every time we serialize a `Node`.
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*/
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std::unique_ptr<msgpack::sbuffer> buffer;
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rocksdb::DB* db = nullptr;
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uint64_t getDrgnTypeSize(struct drgn_type* type);
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uint64_t next();
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bool isContainer(const Variable& variable);
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bool isPrimitive(struct drgn_type* type);
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Node process(NodeID id, Variable variable);
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void processContainer(const Variable& variable, Node& node);
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template <class T>
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std::string_view serialize(const T&);
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void JSON(NodeID id, std::ofstream& output);
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static void setSize(TreeBuilder::Node& node,
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uint64_t dynamicSize,
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uint64_t memberSizes);
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};
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} // namespace oi::detail
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