llvm/unittests/Support/ManagedStatic.cpp

   1 //===- llvm/unittest/Support/ManagedStatic.cpp - ManagedStatic 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
   9 #include "llvm/Support/Allocator.h"
  10 #include "llvm/Support/ManagedStatic.h"
  11 #include "llvm/Config/config.h"
  12 #ifdef HAVE_PTHREAD_H
  13 #include <pthread.h>
  14 #endif
  15
  16 #include "gtest/gtest.h"
  17
  18 using namespace llvm;
  19
  20 namespace {
  21
  22 #if LLVM_ENABLE_THREADS != 0 && defined(HAVE_PTHREAD_H) && \
  23   !__has_feature(memory_sanitizer)
  24 namespace test1 {
  25   llvm::ManagedStatic<int> ms;
  26   void *helper(void*) {
  27     *ms;
  28     return nullptr;
  29   }
  30
  31   // Valgrind's leak checker complains glibc's stack allocation.
  32   // To appease valgrind, we provide our own stack for each thread.
  33   void *allocate_stack(pthread_attr_t &a, size_t n = 65536) {
  34     void *stack = safe_malloc(n);
  35     pthread_attr_init(&a);
  36 #if defined(__linux__)
  37     pthread_attr_setstack(&a, stack, n);
  38 #endif
  39     return stack;
  40   }
  41 }
  42
  43 TEST(Initialize, MultipleThreads) {
  44   // Run this test under tsan: http://code.google.com/p/data-race-test/
  45
  46   pthread_attr_t a1, a2;
  47   void *p1 = test1::allocate_stack(a1);
  48   void *p2 = test1::allocate_stack(a2);
  49
  50   pthread_t t1, t2;
  51   pthread_create(&t1, &a1, test1::helper, nullptr);
  52   pthread_create(&t2, &a2, test1::helper, nullptr);
  53   pthread_join(t1, nullptr);
  54   pthread_join(t2, nullptr);
  55   free(p1);
  56   free(p2);
  57 }
  58 #endif
  59
  60 namespace NestedStatics {
  61 static ManagedStatic<int> Ms1;
  62 struct Nest {
  63   Nest() {
  64     ++(*Ms1);
  65   }
  66
  67   ~Nest() {
  68     assert(Ms1.isConstructed());
  69     ++(*Ms1);
  70   }
  71 };
  72 static ManagedStatic<Nest> Ms2;
  73
  74 TEST(ManagedStaticTest, NestedStatics) {
  75   EXPECT_FALSE(Ms1.isConstructed());
  76   EXPECT_FALSE(Ms2.isConstructed());
  77
  78   *Ms2;
  79   EXPECT_TRUE(Ms1.isConstructed());
  80   EXPECT_TRUE(Ms2.isConstructed());
  81 }
  82 } // namespace NestedStatics
  83
  84 namespace CustomCreatorDeletor {
  85 struct CustomCreate {
  86   static void *call() {
  87     void *Mem = safe_malloc(sizeof(int));
  88     *((int *)Mem) = 42;
  89     return Mem;
  90   }
  91 };
  92 struct CustomDelete {
  93   static void call(void *P) { std::free(P); }
  94 };
  95 static ManagedStatic<int, CustomCreate, CustomDelete> Custom;
  96 TEST(ManagedStaticTest, CustomCreatorDeletor) {
  97   EXPECT_EQ(42, *Custom);
  98 }
  99 } // namespace CustomCreatorDeletor
 100
 101 } // anonymous namespace