mirror of
https://github.com/JakeHillion/object-introspection.git
synced 2024-09-19 19:19:05 +01:00
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
74 lines
2.1 KiB
C++
74 lines
2.1 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 <list>
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#include <string>
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#include "NodeTracker.h"
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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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extern "C" {
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#include <drgn.h>
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}
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struct TypeHierarchy;
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namespace oi::detail::type_graph {
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/*
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* DrgnExporter
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*
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* Converts Type Graph nodes into minimal drgn_type structs and populates a
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* TypeHierarchy with them, for use by TreeBuilder v1.
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*/
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class DrgnExporter : public Visitor<drgn_type*> {
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public:
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static Pass createPass(TypeHierarchy& th, std::list<drgn_type>& drgnTypes);
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DrgnExporter(TypeHierarchy& th, std::list<drgn_type>& drgnTypes)
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: th_(th), drgnTypes_(drgnTypes) {
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}
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drgn_type* accept(Type&);
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drgn_type* visit(Incomplete&) override;
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drgn_type* visit(Class&) override;
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drgn_type* visit(Container&) override;
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drgn_type* visit(Primitive&) override;
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drgn_type* visit(Enum&) override;
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drgn_type* visit(Array&) override;
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drgn_type* visit(Typedef&) override;
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drgn_type* visit(Pointer&) override;
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drgn_type* visit(Reference&) override;
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drgn_type* visit(Dummy&) override;
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drgn_type* visit(DummyAllocator&) override;
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drgn_type* visit(CaptureKeys&) override;
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private:
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drgn_type* makeDrgnType(enum drgn_type_kind kind,
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bool is_complete,
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enum drgn_primitive_type primitive,
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const Type& type);
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ResultTracker<drgn_type*> tracker_;
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TypeHierarchy& th_;
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std::list<drgn_type>& drgnTypes_;
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};
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} // namespace oi::detail::type_graph
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