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
68 lines
2.0 KiB
C++
68 lines
2.0 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 <ostream>
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#include "NodeTracker.h"
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#include "Types.h"
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#include "Visitor.h"
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namespace oi::detail::type_graph {
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/*
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* Printer
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*/
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class Printer : public ConstVisitor {
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public:
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Printer(std::ostream& out, NodeTracker& tracker, size_t numTypes);
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void print(const Type& type);
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void visit(const Incomplete& i) override;
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void visit(const Class& c) override;
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void visit(const Container& c) override;
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void visit(const Primitive& p) override;
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void visit(const Enum& e) override;
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void visit(const Array& a) override;
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void visit(const Typedef& td) override;
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void visit(const Pointer& p) override;
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void visit(const Reference& r) override;
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void visit(const Dummy& d) override;
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void visit(const DummyAllocator& d) override;
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void visit(const CaptureKeys& d) override;
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private:
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void prefix();
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[[nodiscard]] bool prefix(const Type& type);
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void print_param(const TemplateParam& param);
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void print_parent(const Parent& parent);
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void print_member(const Member& member);
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void print_function(const Function& function);
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void print_type(std::string_view header, const Type& type);
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void print_value(const std::string& value);
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void print_qualifiers(const QualifierSet& qualifiers);
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void print_enumerator(int64_t val, const std::string& name);
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static std::string align_str(uint64_t align);
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NodeTracker& tracker_;
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std::ostream& out_;
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int baseIndent_;
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int depth_ = -1;
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};
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} // namespace oi::detail::type_graph
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