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
65 lines
1.7 KiB
C++
65 lines
1.7 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 <vector>
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#include "oi/DrgnUtils.h"
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#include "oi/OICodeGen.h"
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#include "oi/OICompiler.h"
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namespace clang::tooling {
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class CompilationDatabase;
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}
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namespace oi::detail {
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namespace type_graph {
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class Type;
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}
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class OIGenerator {
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public:
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int generate(clang::tooling::CompilationDatabase&,
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const std::vector<std::string>&);
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void setOutputPath(fs::path _outputPath) {
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outputPath = std::move(_outputPath);
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}
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void setConfigFilePaths(std::vector<fs::path> _configFilePaths) {
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configFilePaths = std::move(_configFilePaths);
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}
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void setSourceFileDumpPath(fs::path _sourceFileDumpPath) {
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sourceFileDumpPath = std::move(_sourceFileDumpPath);
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}
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void setFailIfNothingGenerated(bool fail) {
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failIfNothingGenerated = fail;
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}
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void setClangArgs(std::vector<std::string> args_) {
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clangArgs = std::move(args_);
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}
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private:
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std::filesystem::path outputPath;
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std::vector<std::filesystem::path> configFilePaths;
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std::filesystem::path sourceFileDumpPath;
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bool failIfNothingGenerated = false;
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std::vector<std::string> clangArgs;
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};
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} // namespace oi::detail
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