diff -r 000000000000 -r 6474c204b198 mfbt/tests/TestAtomics.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mfbt/tests/TestAtomics.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,242 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/Assertions.h"
+#include "mozilla/Atomics.h"
+
+#include <stdint.h>
+
+using mozilla::Atomic;
+using mozilla::MemoryOrdering;
+using mozilla::Relaxed;
+using mozilla::ReleaseAcquire;
+using mozilla::SequentiallyConsistent;
+
+template <typename T, MemoryOrdering Order>
+static void
+TestTypeWithOrdering()
+{
+  Atomic<T, Order> atomic(5);
+  MOZ_RELEASE_ASSERT(atomic == 5, "Atomic variable did not initialize");
+
+  // Test atomic increment
+  MOZ_RELEASE_ASSERT(++atomic == T(6), "Atomic increment did not work");
+  MOZ_RELEASE_ASSERT(atomic++ == T(6), "Atomic post-increment did not work");
+  MOZ_RELEASE_ASSERT(atomic == T(7), "Atomic post-increment did not work");
+
+  // Test atomic decrement
+  MOZ_RELEASE_ASSERT(--atomic == 6, "Atomic decrement did not work");
+  MOZ_RELEASE_ASSERT(atomic-- == 6, "Atomic post-decrement did not work");
+  MOZ_RELEASE_ASSERT(atomic == 5, "Atomic post-decrement did not work");
+
+  // Test other arithmetic.
+  T result;
+  result = (atomic += T(5));
+  MOZ_RELEASE_ASSERT(atomic == T(10), "Atomic += did not work");
+  MOZ_RELEASE_ASSERT(result == T(10), "Atomic += returned the wrong value");
+  result = (atomic -= T(3));
+  MOZ_RELEASE_ASSERT(atomic == T(7), "Atomic -= did not work");
+  MOZ_RELEASE_ASSERT(result == T(7), "Atomic -= returned the wrong value");
+
+  // Test assignment
+  result = (atomic = T(5));
+  MOZ_RELEASE_ASSERT(atomic == T(5), "Atomic assignment failed");
+  MOZ_RELEASE_ASSERT(result == T(5), "Atomic assignment returned the wrong value");
+
+  // Test logical operations.
+  result = (atomic ^= T(2));
+  MOZ_RELEASE_ASSERT(atomic == T(7), "Atomic ^= did not work");
+  MOZ_RELEASE_ASSERT(result == T(7), "Atomic ^= returned the wrong value");
+  result = (atomic ^= T(4));
+  MOZ_RELEASE_ASSERT(atomic == T(3), "Atomic ^= did not work");
+  MOZ_RELEASE_ASSERT(result == T(3), "Atomic ^= returned the wrong value");
+  result = (atomic |= T(8));
+  MOZ_RELEASE_ASSERT(atomic == T(11), "Atomic |= did not work");
+  MOZ_RELEASE_ASSERT(result == T(11), "Atomic |= returned the wrong value");
+  result = (atomic |= T(8));
+  MOZ_RELEASE_ASSERT(atomic == T(11), "Atomic |= did not work");
+  MOZ_RELEASE_ASSERT(result == T(11), "Atomic |= returned the wrong value");
+  result = (atomic &= T(12));
+  MOZ_RELEASE_ASSERT(atomic == T(8), "Atomic &= did not work");
+  MOZ_RELEASE_ASSERT(result == T(8), "Atomic &= returned the wrong value");
+
+  // Test exchange.
+  atomic = T(30);
+  result = atomic.exchange(42);
+  MOZ_RELEASE_ASSERT(atomic == T(42), "Atomic exchange did not work");
+  MOZ_RELEASE_ASSERT(result == T(30), "Atomic exchange returned the wrong value");
+
+  // Test CAS.
+  atomic = T(1);
+  bool boolResult = atomic.compareExchange(0, 2);
+  MOZ_RELEASE_ASSERT(!boolResult, "CAS should have returned false.");
+  MOZ_RELEASE_ASSERT(atomic == T(1), "CAS shouldn't have done anything.");
+
+  boolResult = atomic.compareExchange(1, 42);
+  MOZ_RELEASE_ASSERT(boolResult, "CAS should have succeeded.");
+  MOZ_RELEASE_ASSERT(atomic == T(42), "CAS should have changed atomic's value.");
+}
+
+template<typename T, MemoryOrdering Order>
+static void
+TestPointerWithOrdering()
+{
+  T array1[10];
+  Atomic<T*, Order> atomic(array1);
+  MOZ_RELEASE_ASSERT(atomic == array1, "Atomic variable did not initialize");
+
+  // Test atomic increment
+  MOZ_RELEASE_ASSERT(++atomic == array1 + 1, "Atomic increment did not work");
+  MOZ_RELEASE_ASSERT(atomic++ == array1 + 1, "Atomic post-increment did not work");
+  MOZ_RELEASE_ASSERT(atomic == array1 + 2, "Atomic post-increment did not work");
+
+  // Test atomic decrement
+  MOZ_RELEASE_ASSERT(--atomic == array1 + 1, "Atomic decrement did not work");
+  MOZ_RELEASE_ASSERT(atomic-- == array1 + 1, "Atomic post-decrement did not work");
+  MOZ_RELEASE_ASSERT(atomic == array1, "Atomic post-decrement did not work");
+
+  // Test other arithmetic operations
+  T* result;
+  result = (atomic += 2);
+  MOZ_RELEASE_ASSERT(atomic == array1 + 2, "Atomic += did not work");
+  MOZ_RELEASE_ASSERT(result == array1 + 2, "Atomic += returned the wrong value");
+  result = (atomic -= 1);
+  MOZ_RELEASE_ASSERT(atomic == array1 + 1, "Atomic -= did not work");
+  MOZ_RELEASE_ASSERT(result == array1 + 1, "Atomic -= returned the wrong value");
+
+  // Test stores
+  result = (atomic = array1);
+  MOZ_RELEASE_ASSERT(atomic == array1, "Atomic assignment did not work");
+  MOZ_RELEASE_ASSERT(result == array1, "Atomic assignment returned the wrong value");
+
+  // Test exchange
+  atomic = array1 + 2;
+  result = atomic.exchange(array1);
+  MOZ_RELEASE_ASSERT(atomic == array1, "Atomic exchange did not work");
+  MOZ_RELEASE_ASSERT(result == array1 + 2, "Atomic exchange returned the wrong value");
+
+  atomic = array1;
+  bool boolResult = atomic.compareExchange(array1 + 1, array1 + 2);
+  MOZ_RELEASE_ASSERT(!boolResult, "CAS should have returned false.");
+  MOZ_RELEASE_ASSERT(atomic == array1, "CAS shouldn't have done anything.");
+
+  boolResult = atomic.compareExchange(array1, array1 + 3);
+  MOZ_RELEASE_ASSERT(boolResult, "CAS should have succeeded.");
+  MOZ_RELEASE_ASSERT(atomic == array1 + 3, "CAS should have changed atomic's value.");
+}
+
+enum EnumType {
+  EnumType_0 = 0,
+  EnumType_1 = 1,
+  EnumType_2 = 2,
+  EnumType_3 = 3
+};
+
+template<MemoryOrdering Order>
+static void
+TestEnumWithOrdering()
+{
+  Atomic<EnumType, Order> atomic(EnumType_2);
+  MOZ_RELEASE_ASSERT(atomic == EnumType_2, "Atomic variable did not initialize");
+
+  // Test assignment
+  EnumType result;
+  result = (atomic = EnumType_3);
+  MOZ_RELEASE_ASSERT(atomic == EnumType_3, "Atomic assignment failed");
+  MOZ_RELEASE_ASSERT(result == EnumType_3, "Atomic assignment returned the wrong value");
+
+  // Test exchange.
+  atomic = EnumType_1;
+  result = atomic.exchange(EnumType_2);
+  MOZ_RELEASE_ASSERT(atomic == EnumType_2, "Atomic exchange did not work");
+  MOZ_RELEASE_ASSERT(result == EnumType_1, "Atomic exchange returned the wrong value");
+
+  // Test CAS.
+  atomic = EnumType_1;
+  bool boolResult = atomic.compareExchange(EnumType_0, EnumType_2);
+  MOZ_RELEASE_ASSERT(!boolResult, "CAS should have returned false.");
+  MOZ_RELEASE_ASSERT(atomic == EnumType_1, "CAS shouldn't have done anything.");
+
+  boolResult = atomic.compareExchange(EnumType_1, EnumType_3);
+  MOZ_RELEASE_ASSERT(boolResult, "CAS should have succeeded.");
+  MOZ_RELEASE_ASSERT(atomic == EnumType_3, "CAS should have changed atomic's value.");
+}
+
+template <MemoryOrdering Order>
+static void
+TestBoolWithOrdering()
+{
+  Atomic<bool, Order> atomic(false);
+  MOZ_RELEASE_ASSERT(atomic == false, "Atomic variable did not initialize");
+
+  // Test assignment
+  bool result;
+  result = (atomic = true);
+  MOZ_RELEASE_ASSERT(atomic == true, "Atomic assignment failed");
+  MOZ_RELEASE_ASSERT(result == true, "Atomic assignment returned the wrong value");
+
+  // Test exchange.
+  atomic = false;
+  result = atomic.exchange(true);
+  MOZ_RELEASE_ASSERT(atomic == true, "Atomic exchange did not work");
+  MOZ_RELEASE_ASSERT(result == false, "Atomic exchange returned the wrong value");
+
+  // Test CAS.
+  atomic = false;
+  bool boolResult = atomic.compareExchange(true, false);
+  MOZ_RELEASE_ASSERT(!boolResult, "CAS should have returned false.");
+  MOZ_RELEASE_ASSERT(atomic == false, "CAS shouldn't have done anything.");
+
+  boolResult = atomic.compareExchange(false, true);
+  MOZ_RELEASE_ASSERT(boolResult, "CAS should have succeeded.");
+  MOZ_RELEASE_ASSERT(atomic == true, "CAS should have changed atomic's value.");
+}
+
+template <typename T>
+static void
+TestType()
+{
+  TestTypeWithOrdering<T, SequentiallyConsistent>();
+  TestTypeWithOrdering<T, ReleaseAcquire>();
+  TestTypeWithOrdering<T, Relaxed>();
+}
+
+template<typename T>
+static void
+TestPointer()
+{
+  TestPointerWithOrdering<T, SequentiallyConsistent>();
+  TestPointerWithOrdering<T, ReleaseAcquire>();
+  TestPointerWithOrdering<T, Relaxed>();
+}
+
+static void
+TestEnum()
+{
+  TestEnumWithOrdering<SequentiallyConsistent>();
+  TestEnumWithOrdering<ReleaseAcquire>();
+  TestEnumWithOrdering<Relaxed>();
+}
+
+static void
+TestBool()
+{
+  TestBoolWithOrdering<SequentiallyConsistent>();
+  TestBoolWithOrdering<ReleaseAcquire>();
+  TestBoolWithOrdering<Relaxed>();
+}
+
+int main()
+{
+  TestType<uint32_t>();
+  TestType<int32_t>();
+  TestType<intptr_t>();
+  TestType<uintptr_t>();
+  TestPointer<int>();
+  TestPointer<float>();
+  TestPointer<uint16_t*>();
+  TestPointer<uint32_t*>();
+  TestEnum();
+  TestBool();
+}