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
94 lines
3.0 KiB
C++
94 lines
3.0 KiB
C++
/*
|
|
* Copyright (c) Meta Platforms, Inc. and affiliates.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#include <clang/Tooling/CommonOptionsParser.h>
|
|
#include <gflags/gflags.h>
|
|
#include <glog/logging.h>
|
|
|
|
#include <cstdlib>
|
|
#include <filesystem>
|
|
#include <iostream>
|
|
#include <range/v3/range/conversion.hpp>
|
|
#include <range/v3/view/transform.hpp>
|
|
#include <vector>
|
|
|
|
#include "oi/OICodeGen.h"
|
|
#include "oi/OIGenerator.h"
|
|
|
|
namespace fs = std::filesystem;
|
|
using namespace oi::detail;
|
|
|
|
static llvm::cl::OptionCategory OilgenCategory("oilgen options");
|
|
|
|
static llvm::cl::list<std::string> ConfigFiles(
|
|
"config-file",
|
|
llvm::cl::desc(R"(</path/to/oid.toml>)"),
|
|
llvm::cl::cat(OilgenCategory));
|
|
static llvm::cl::opt<std::string> OutputFile(
|
|
"output",
|
|
llvm::cl::desc(R"(Write output to this file.)"),
|
|
llvm::cl::init("a.o"),
|
|
llvm::cl::cat(OilgenCategory));
|
|
static llvm::cl::opt<int> DebugLevel(
|
|
"debug-level",
|
|
llvm::cl::desc(R"(Verbose level for logging.)"),
|
|
llvm::cl::init(-1),
|
|
llvm::cl::cat(OilgenCategory));
|
|
static llvm::cl::opt<std::string> DumpJit(
|
|
"dump-jit",
|
|
llvm::cl::desc(R"(Write the generated code to a file.)"),
|
|
llvm::cl::init("jit.cpp"),
|
|
llvm::cl::cat(OilgenCategory));
|
|
|
|
int main(int argc, const char* argv[]) {
|
|
google::InitGoogleLogging(argv[0]);
|
|
FLAGS_minloglevel = 0;
|
|
FLAGS_stderrthreshold = 0;
|
|
|
|
auto expectedParser =
|
|
clang::tooling::CommonOptionsParser::create(argc, argv, OilgenCategory);
|
|
if (!expectedParser) {
|
|
llvm::errs() << expectedParser.takeError();
|
|
return -1;
|
|
}
|
|
clang::tooling::CommonOptionsParser& options = expectedParser.get();
|
|
auto& compilations = options.getCompilations();
|
|
|
|
if (DebugLevel.getNumOccurrences()) {
|
|
google::LogToStderr();
|
|
google::SetStderrLogging(google::INFO);
|
|
google::SetVLOGLevel("*", DebugLevel);
|
|
// Upstream glog defines `GLOG_INFO` as 0 https://fburl.com/ydjajhz0,
|
|
// but internally it's defined as 1 https://fburl.com/code/9fwams75
|
|
gflags::SetCommandLineOption("minloglevel", "0");
|
|
}
|
|
|
|
OIGenerator oigen;
|
|
|
|
oigen.setConfigFilePaths(ConfigFiles |
|
|
ranges::views::transform([](const auto& p) {
|
|
return std::filesystem::path(p);
|
|
}) |
|
|
ranges::to<std::vector>());
|
|
if (DumpJit.getNumOccurrences())
|
|
oigen.setSourceFileDumpPath(DumpJit.getValue());
|
|
|
|
oigen.setOutputPath(OutputFile.getValue());
|
|
|
|
oigen.setFailIfNothingGenerated(true);
|
|
return oigen.generate(compilations, options.getSourcePathList());
|
|
}
|