mirror of
https://github.com/JakeHillion/object-introspection.git
synced 2024-11-09 21:24:14 +00:00
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
94 lines
3.0 KiB
C++
94 lines
3.0 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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#include <clang/Tooling/CommonOptionsParser.h>
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#include <gflags/gflags.h>
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#include <glog/logging.h>
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#include <cstdlib>
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#include <filesystem>
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#include <iostream>
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#include <range/v3/range/conversion.hpp>
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#include <range/v3/view/transform.hpp>
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#include <vector>
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#include "oi/OICodeGen.h"
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#include "oi/OIGenerator.h"
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namespace fs = std::filesystem;
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using namespace oi::detail;
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static llvm::cl::OptionCategory OilgenCategory("oilgen options");
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static llvm::cl::list<std::string> ConfigFiles(
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"config-file",
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llvm::cl::desc(R"(</path/to/oid.toml>)"),
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llvm::cl::cat(OilgenCategory));
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static llvm::cl::opt<std::string> OutputFile(
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"output",
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llvm::cl::desc(R"(Write output to this file.)"),
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llvm::cl::init("a.o"),
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llvm::cl::cat(OilgenCategory));
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static llvm::cl::opt<int> DebugLevel(
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"debug-level",
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llvm::cl::desc(R"(Verbose level for logging.)"),
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llvm::cl::init(-1),
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llvm::cl::cat(OilgenCategory));
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static llvm::cl::opt<std::string> DumpJit(
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"dump-jit",
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llvm::cl::desc(R"(Write the generated code to a file.)"),
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llvm::cl::init("jit.cpp"),
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llvm::cl::cat(OilgenCategory));
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int main(int argc, const char* argv[]) {
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google::InitGoogleLogging(argv[0]);
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FLAGS_minloglevel = 0;
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FLAGS_stderrthreshold = 0;
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auto expectedParser =
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clang::tooling::CommonOptionsParser::create(argc, argv, OilgenCategory);
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if (!expectedParser) {
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llvm::errs() << expectedParser.takeError();
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return -1;
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}
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clang::tooling::CommonOptionsParser& options = expectedParser.get();
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auto& compilations = options.getCompilations();
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if (DebugLevel.getNumOccurrences()) {
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google::LogToStderr();
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google::SetStderrLogging(google::INFO);
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google::SetVLOGLevel("*", DebugLevel);
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// Upstream glog defines `GLOG_INFO` as 0 https://fburl.com/ydjajhz0,
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// but internally it's defined as 1 https://fburl.com/code/9fwams75
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gflags::SetCommandLineOption("minloglevel", "0");
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}
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OIGenerator oigen;
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oigen.setConfigFilePaths(ConfigFiles |
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ranges::views::transform([](const auto& p) {
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return std::filesystem::path(p);
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}) |
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ranges::to<std::vector>());
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if (DumpJit.getNumOccurrences())
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oigen.setSourceFileDumpPath(DumpJit.getValue());
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oigen.setOutputPath(OutputFile.getValue());
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oigen.setFailIfNothingGenerated(true);
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return oigen.generate(compilations, options.getSourcePathList());
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}
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