llvm-project/llvm/unittests/Support/ManagedStatic.cpp

//===- llvm/unittest/Support/ManagedStatic.cpp - ManagedStatic tests ------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "llvm/Support/Allocator.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Config/config.h"
#ifdef HAVE_PTHREAD_H
#include <pthread.h>
#endif

#include "gtest/gtest.h"

using namespace llvm;

namespace {

#if LLVM_ENABLE_THREADS != 0 && defined(HAVE_PTHREAD_H) && \
  !__has_feature(memory_sanitizer)
namespace test1 {
  llvm::ManagedStatic<int> ms;
  void *helper(void*) {
    *ms;
    return nullptr;
  }

  // Valgrind's leak checker complains glibc's stack allocation.
  // To appease valgrind, we provide our own stack for each thread.
  void *allocate_stack(pthread_attr_t &a, size_t n = 65536) {
    void *stack = llvm::malloc(n);
    pthread_attr_init(&a);
#if defined(__linux__)
    pthread_attr_setstack(&a, stack, n);
#endif
    return stack;
  }
}

TEST(Initialize, MultipleThreads) {
  // Run this test under tsan: http://code.google.com/p/data-race-test/

  pthread_attr_t a1, a2;
  void *p1 = test1::allocate_stack(a1);
  void *p2 = test1::allocate_stack(a2);

  pthread_t t1, t2;
  pthread_create(&t1, &a1, test1::helper, nullptr);
  pthread_create(&t2, &a2, test1::helper, nullptr);
  pthread_join(t1, nullptr);
  pthread_join(t2, nullptr);
  free(p1);
  free(p2);
}
#endif

namespace NestedStatics {
static ManagedStatic<int> Ms1;
struct Nest {
  Nest() {
    ++(*Ms1);
  }

  ~Nest() {
    assert(Ms1.isConstructed());
    ++(*Ms1);
  }
};
static ManagedStatic<Nest> Ms2;

TEST(ManagedStaticTest, NestedStatics) {
  EXPECT_FALSE(Ms1.isConstructed());
  EXPECT_FALSE(Ms2.isConstructed());

  *Ms2;
  EXPECT_TRUE(Ms1.isConstructed());
  EXPECT_TRUE(Ms2.isConstructed());
}
} // namespace NestedStatics

namespace CustomCreatorDeletor {
struct CustomCreate {
  static void *call() {
    void *Mem = llvm::malloc(sizeof(int));
    *((int *)Mem) = 42;
    return Mem;
  }
};
struct CustomDelete {
  static void call(void *P) { std::free(P); }
};
static ManagedStatic<int, CustomCreate, CustomDelete> Custom;
TEST(ManagedStaticTest, CustomCreatorDeletor) {
  EXPECT_EQ(42, *Custom);
}
} // namespace CustomCreatorDeletor

} // anonymous namespace