Dmitry.Kozhevnikov created this revision.
Dmitry.Kozhevnikov added reviewers: ilya-biryukov, sammccall.
Herald added subscribers: cfe-commits, kadircet, arphaman, jkorous, MaskRay,
ioeric.
By default it's 512K, which is way to small for clang parser to run on. There
is no way to do it via platform-independent API, so it's implemented via
pthreads directly in clangd/Threading.cpp.
Repository:
rCTE Clang Tools Extra
https://reviews.llvm.org/D50993
Files:
clangd/Threading.cpp
unittests/clangd/ClangdTests.cpp
Index: unittests/clangd/ClangdTests.cpp
===================================================================
--- unittests/clangd/ClangdTests.cpp
+++ unittests/clangd/ClangdTests.cpp
@@ -963,6 +963,27 @@
Field(&CodeCompletion::Name, "baz")));
}
+TEST_F(ClangdVFSTest, TestStackOverflow) {
+ MockFSProvider FS;
+ ErrorCheckingDiagConsumer DiagConsumer;
+ MockCompilationDatabase CDB;
+ ClangdServer Server(CDB, FS, DiagConsumer, ClangdServer::optsForTest());
+
+ const auto SourceContents = R"cpp(
+ constexpr int foo() { return foo(); }
+ static_assert(foo());
+ )cpp";
+
+ auto FooCpp = testPath("foo.cpp");
+ FS.Files[FooCpp] = SourceContents;
+
+ Server.addDocument(FooCpp, SourceContents);
+ ASSERT_TRUE(Server.blockUntilIdleForTest()) << "Waiting for diagnostics";
+ // check that we got a constexpr depth error, and not crashed by stack
+ // overflow
+ EXPECT_TRUE(DiagConsumer.hadErrorInLastDiags());
+}
+
} // namespace
} // namespace clangd
} // namespace clang
Index: clangd/Threading.cpp
===================================================================
--- clangd/Threading.cpp
+++ clangd/Threading.cpp
@@ -42,6 +42,56 @@
SlotsChanged.notify_one();
}
+namespace {
+template <typename Data>
+using UserFnPtr = void (*)(Data);
+
+template <typename Data>
+struct ThreadInfo {
+ UserFnPtr<Data> UserFn;
+ Data UserData;
+};
+} // namespace
+
+template <typename Data>
+static void executeOnThreadAndDetach(UserFnPtr<Data> UserFn, Data UserData) {
+#if !defined(__APPLE__)
+ std::thread([UserFn](Data UserData) { UserFn(std::move(UserData)); },
+ std::move(UserData))
+ .detach();
+#else
+ // On macOS, there is no way to change the default 512K stack size for threads
+ // other than main using the std::thread API. 512K, however, is way to small
+ // for the parser to run. Here we're using pthreads API to set the 8 Mb
+ // stack size, as it's the default for the main thread in modern Linux/macOS
+ // distributions, so it's probably the most well-tested value.
+
+ pthread_attr_t Attr;
+ if (::pthread_attr_init(&Attr) != 0)
+ return;
+
+ auto AttrGuard =
+ llvm::make_scope_exit([&] { ::pthread_attr_destroy(&Attr); });
+
+ if (::pthread_attr_setstacksize(&Attr, 8 * 1024 * 1024) != 0)
+ return;
+
+ std::unique_ptr<ThreadInfo<Data>> Info(
+ new ThreadInfo<Data>{UserFn, std::move(UserData)});
+ pthread_t Thread;
+ auto ThreadFun = [](void *Arg) -> void * {
+ std::unique_ptr<ThreadInfo<Data>> TI(static_cast<ThreadInfo<Data> *>(Arg));
+ TI->UserFn(std::move(TI->UserData));
+ return nullptr;
+ };
+ if (::pthread_create(&Thread, &Attr, ThreadFun, Info.get()) != 0)
+ return;
+
+ // now it would be destroyed in the new thread
+ Info.release();
+#endif
+}
+
AsyncTaskRunner::~AsyncTaskRunner() { wait(); }
bool AsyncTaskRunner::wait(Deadline D) const {
@@ -67,16 +117,22 @@
}
});
- std::thread(
- [](std::string Name, decltype(Action) Action, decltype(CleanupTask)) {
- llvm::set_thread_name(Name);
- Action();
- // Make sure function stored by Action is destroyed before CleanupTask
- // is run.
- Action = nullptr;
- },
- Name.str(), std::move(Action), std::move(CleanupTask))
- .detach();
+ struct Data {
+ std::string Name;
+ decltype(Action) Action;
+ decltype(CleanupTask) CleanupTask;
+ };
+ Data UserData{Name.str(), std::move(Action), std::move(CleanupTask)};
+
+ auto Func = [](Data UserData) {
+ llvm::set_thread_name(UserData.Name);
+ UserData.Action();
+ // Make sure function stored by Action is destroyed before CleanupTask
+ // is run.
+ UserData.Action = nullptr;
+ };
+
+ executeOnThreadAndDetach<Data>(Func, std::move(UserData));
}
Deadline timeoutSeconds(llvm::Optional<double> Seconds) {
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