clang-tools  15.0.0git
ThreadCrashReporterTests.cpp
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1 ///===- ThreadCrashReporterTests.cpp - Thread local signal handling tests -===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
10 #include "support/Threading.h"
11 #include "llvm/Support/Signals.h"
12 #include "gtest/gtest.h"
13 #include <csignal>
14 #include <string>
15 
16 namespace clang {
17 namespace clangd {
18 
19 namespace {
20 
21 static void infoSignalHandler() { ThreadCrashReporter::runCrashHandlers(); }
22 
23 TEST(ThreadCrashReporterTest, All) {
24 #if defined(_WIN32)
25  // Simulate signals on Windows for unit testing purposes.
26  // The `crash.test` lit test checks the end-to-end integration.
27  auto SignalCurrentThread = []() { infoSignalHandler(); };
28 #else
29  llvm::sys::SetInfoSignalFunction(&infoSignalHandler);
30  auto SignalCurrentThread = []() { raise(SIGUSR1); };
31 #endif
32 
33  AsyncTaskRunner Runner;
34  auto SignalAnotherThread = [&]() {
35  Runner.runAsync("signal another thread", SignalCurrentThread);
36  Runner.wait();
37  };
38 
39  bool Called;
40  {
41  ThreadCrashReporter ScopedReporter([&Called]() { Called = true; });
42  // Check handler gets called when a signal gets delivered to the current
43  // thread.
44  Called = false;
45  SignalCurrentThread();
46  EXPECT_TRUE(Called);
47 
48  // Check handler does not get called when another thread gets signalled.
49  Called = false;
50  SignalAnotherThread();
51  EXPECT_FALSE(Called);
52  }
53  // Check handler does not get called when the reporter object goes out of
54  // scope.
55  Called = false;
56  SignalCurrentThread();
57  EXPECT_FALSE(Called);
58 
59  std::string Order = "";
60  {
61  ThreadCrashReporter ScopedReporter([&Order] { Order.push_back('a'); });
62  {
63  ThreadCrashReporter ScopedReporter([&Order] { Order.push_back('b'); });
64  SignalCurrentThread();
65  }
66  // Check that handlers are called in LIFO order.
67  EXPECT_EQ(Order, "ba");
68 
69  // Check that current handler is the only one after the nested scope is
70  // over.
71  SignalCurrentThread();
72  EXPECT_EQ(Order, "baa");
73  }
74 }
75 
76 } // namespace
77 } // namespace clangd
78 } // namespace clang
clang::clangd::TEST
TEST(BackgroundQueueTest, Priority)
Definition: BackgroundIndexTests.cpp:750
clang::clangd::ThreadCrashReporter::runCrashHandlers
static void runCrashHandlers()
Calls all currently-active ThreadCrashReporters for the current thread.
Definition: ThreadCrashReporter.cpp:18
Threading.h
ThreadCrashReporter.h
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition: ApplyReplacements.h:27