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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
50 lines
1.4 KiB
C++
50 lines
1.4 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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#include "RemoveTopLevelPointer.h"
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#include "TypeGraph.h"
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namespace oi::detail::type_graph {
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Pass RemoveTopLevelPointer::createPass() {
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auto fn = [](TypeGraph& typeGraph, NodeTracker&) {
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RemoveTopLevelPointer pass;
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pass.removeTopLevelPointers(typeGraph.rootTypes());
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};
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return Pass("RemoveTopLevelPointer", fn);
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}
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void RemoveTopLevelPointer::removeTopLevelPointers(
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std::vector<std::reference_wrapper<Type>>& types) {
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for (size_t i = 0; i < types.size(); i++) {
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Type& type = types[i];
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topLevelType_ = &type;
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type.accept(*this);
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types[i] = *topLevelType_;
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}
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}
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void RemoveTopLevelPointer::visit(Pointer& p) {
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topLevelType_ = &p.pointeeType();
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}
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void RemoveTopLevelPointer::visit(Reference& r) {
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topLevelType_ = &r.pointeeType();
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}
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} // namespace oi::detail::type_graph
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