mirror of
https://github.com/JakeHillion/object-introspection.git
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55989a9156
Summary:
oilgen: migrate to source parsing
Using debug information generated from partial source (that is, not the final
binary) has been insufficient to generally generate OIL code.
A particular example is pointers to templates:
```cpp
#include <oi/oi.h>
template <typename T>
struct Foo {
T t;
};
template <typename T>
struct Bar {
Foo<T>& f;
};
void foo(const Bar<int>& b) {
oi::introspect(b);
}
```
The pointer/reference to `Foo<int>` appears in DWARF with
`DW_AT_declaration(true)` because it could be specialised before its usage.
However, with OIL, we are creating an implicit usage site in the
`oi::introspect` call that the compiler is unable to see.
This change reworks OILGen to work from a Clang command line rather than debug
information. We setup and run a compiler on the source, giving us access to an
AST and Semantic Analyser. We then:
- Find the `oi::introspect` template.
- Iterate through each of its callsites for their type.
- Run `ClangTypeParser::parse` on each type.
- Run codegen.
- Compile into an object file.
Having access to the semantic analyser allows us to forcefully complete a type,
as it would be if it was used in the initial code.
Test Plan:
hope
`buck2 run fbcode//mode/opt fbcode//object-introspection/oil/examples/compile-time:compile-time`
Reviewed By: tyroguru
Differential Revision: D51854477
Pulled By: JakeHillion
110 lines
3.7 KiB
C++
110 lines
3.7 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 <filesystem>
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#include <functional>
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#include <list>
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#include <memory>
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#include <string>
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#include <unordered_map>
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#include <unordered_set>
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#include <vector>
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#include "ContainerInfo.h"
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#include "OICodeGen.h"
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#include "type_graph/TypeGraph.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 Class;
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class Member;
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} // namespace oi::detail::type_graph
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namespace oi::detail {
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class CodeGen {
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public:
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CodeGen(const OICodeGen::Config& config);
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CodeGen(const OICodeGen::Config& config, SymbolService& symbols)
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: config_(config), symbols_(&symbols) {
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}
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struct ExactName {
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std::string name;
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};
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struct HashedComponent {
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std::string name;
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};
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using RootFunctionName = std::variant<ExactName, HashedComponent>;
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/*
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* Helper function to perform all the steps required for code generation for a
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* single drgn_type.
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*/
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bool codegenFromDrgn(struct drgn_type* drgnType, std::string& code);
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bool codegenFromDrgn(struct drgn_type* drgnType,
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std::string linkageName,
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std::string& code);
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void exportDrgnTypes(TypeHierarchy& th,
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std::list<drgn_type>& drgnTypes,
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drgn_type** rootType) const;
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bool registerContainers();
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void registerContainer(std::unique_ptr<ContainerInfo> containerInfo);
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void registerContainer(const std::filesystem::path& path);
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void addDrgnRoot(struct drgn_type* drgnType,
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type_graph::TypeGraph& typeGraph);
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void transform(type_graph::TypeGraph& typeGraph);
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void generate(type_graph::TypeGraph& typeGraph,
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std::string& code,
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RootFunctionName rootName);
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private:
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type_graph::TypeGraph typeGraph_;
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const OICodeGen::Config& config_;
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SymbolService* symbols_ = nullptr;
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std::vector<std::unique_ptr<ContainerInfo>> containerInfos_;
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std::unordered_set<const ContainerInfo*> definedContainers_;
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std::unordered_map<const type_graph::Class*, const type_graph::Member*>
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thriftIssetMembers_;
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bool codegenFromDrgn(struct drgn_type* drgnType,
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std::string& code,
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RootFunctionName name);
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void genDefsThrift(const type_graph::TypeGraph& typeGraph, std::string& code);
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void addGetSizeFuncDefs(const type_graph::TypeGraph& typeGraph,
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std::string& code);
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void getClassSizeFuncDef(const type_graph::Class& c, std::string& code);
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void getClassSizeFuncConcrete(std::string_view funcName,
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const type_graph::Class& c,
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std::string& code) const;
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void addTypeHandlers(const type_graph::TypeGraph& typeGraph,
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std::string& code);
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void genClassTypeHandler(const type_graph::Class& c, std::string& code);
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void genClassStaticType(const type_graph::Class& c, std::string& code);
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void genClassTraversalFunction(const type_graph::Class& c, std::string& code);
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void genClassTreeBuilderInstructions(const type_graph::Class& c,
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std::string& code);
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};
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} // namespace oi::detail
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