Atomic ops: sync with Chromium.

test/cctest/test-atomicops.cc

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "v8.h"
+
+#include "cctest.h"
+#include "atomicops.h"
+
+using namespace v8::internal;
+
+
+#define CHECK_EQU(v1, v2) \
+  CHECK_EQ(static_cast<int64_t>(v1), static_cast<int64_t>(v2))
+
+#define NUM_BITS(T) (sizeof(T) * 8)
+
+
+template <class AtomicType>
+static void TestAtomicIncrement() {
+  // For now, we just test the single-threaded execution.
+
+  // Use a guard value to make sure that NoBarrier_AtomicIncrement doesn't
+  // go outside the expected address bounds.  This is to test that the
+  // 32-bit NoBarrier_AtomicIncrement doesn't do the wrong thing on 64-bit
+  // machines.
+  struct {
+    AtomicType prev_word;
+    AtomicType count;
+    AtomicType next_word;
+  } s;
+
+  AtomicType prev_word_value, next_word_value;
+  memset(&prev_word_value, 0xFF, sizeof(AtomicType));
+  memset(&next_word_value, 0xEE, sizeof(AtomicType));
+
+  s.prev_word = prev_word_value;
+  s.count = 0;
+  s.next_word = next_word_value;
+
+  CHECK_EQU(NoBarrier_AtomicIncrement(&s.count, 1), 1);
+  CHECK_EQU(s.count, 1);
+  CHECK_EQU(s.prev_word, prev_word_value);
+  CHECK_EQU(s.next_word, next_word_value);
+
+  CHECK_EQU(NoBarrier_AtomicIncrement(&s.count, 2), 3);
+  CHECK_EQU(s.count, 3);
+  CHECK_EQU(s.prev_word, prev_word_value);
+  CHECK_EQU(s.next_word, next_word_value);
+
+  CHECK_EQU(NoBarrier_AtomicIncrement(&s.count, 3), 6);
+  CHECK_EQU(s.count, 6);
+  CHECK_EQU(s.prev_word, prev_word_value);
+  CHECK_EQU(s.next_word, next_word_value);
+
+  CHECK_EQU(NoBarrier_AtomicIncrement(&s.count, -3), 3);
+  CHECK_EQU(s.count, 3);
+  CHECK_EQU(s.prev_word, prev_word_value);
+  CHECK_EQU(s.next_word, next_word_value);
+
+  CHECK_EQU(NoBarrier_AtomicIncrement(&s.count, -2), 1);
+  CHECK_EQU(s.count, 1);
+  CHECK_EQU(s.prev_word, prev_word_value);
+  CHECK_EQU(s.next_word, next_word_value);
+
+  CHECK_EQU(NoBarrier_AtomicIncrement(&s.count, -1), 0);
+  CHECK_EQU(s.count, 0);
+  CHECK_EQU(s.prev_word, prev_word_value);
+  CHECK_EQU(s.next_word, next_word_value);
+
+  CHECK_EQU(NoBarrier_AtomicIncrement(&s.count, -1), -1);
+  CHECK_EQU(s.count, -1);
+  CHECK_EQU(s.prev_word, prev_word_value);
+  CHECK_EQU(s.next_word, next_word_value);
+
+  CHECK_EQU(NoBarrier_AtomicIncrement(&s.count, -4), -5);
+  CHECK_EQU(s.count, -5);
+  CHECK_EQU(s.prev_word, prev_word_value);
+  CHECK_EQU(s.next_word, next_word_value);
+
+  CHECK_EQU(NoBarrier_AtomicIncrement(&s.count, 5), 0);
+  CHECK_EQU(s.count, 0);
+  CHECK_EQU(s.prev_word, prev_word_value);
+  CHECK_EQU(s.next_word, next_word_value);
+}
+
+
+template <class AtomicType>
+static void TestCompareAndSwap() {
+  AtomicType value = 0;
+  AtomicType prev = NoBarrier_CompareAndSwap(&value, 0, 1);
+  CHECK_EQU(1, value);
+  CHECK_EQU(0, prev);
+
+  // Use a test value that has non-zero bits in both halves, for testing
+  // the 64-bit implementation on 32-bit platforms.
+  const AtomicType k_test_val =
+      (static_cast<AtomicType>(1) << (NUM_BITS(AtomicType) - 2)) + 11;
+  value = k_test_val;
+  prev = NoBarrier_CompareAndSwap(&value, 0, 5);
+  CHECK_EQU(k_test_val, value);
+  CHECK_EQU(k_test_val, prev);
+
+  value = k_test_val;
+  prev = NoBarrier_CompareAndSwap(&value, k_test_val, 5);
+  CHECK_EQU(5, value);
+  CHECK_EQU(k_test_val, prev);
+}
+
+
+template <class AtomicType>
+static void TestAtomicExchange() {
+  AtomicType value = 0;
+  AtomicType new_value = NoBarrier_AtomicExchange(&value, 1);
+  CHECK_EQU(1, value);
+  CHECK_EQU(0, new_value);
+
+  // Use a test value that has non-zero bits in both halves, for testing
+  // the 64-bit implementation on 32-bit platforms.
+  const AtomicType k_test_val =
+      (static_cast<AtomicType>(1) << (NUM_BITS(AtomicType) - 2)) + 11;
+  value = k_test_val;
+  new_value = NoBarrier_AtomicExchange(&value, k_test_val);
+  CHECK_EQU(k_test_val, value);
+  CHECK_EQU(k_test_val, new_value);
+
+  value = k_test_val;
+  new_value = NoBarrier_AtomicExchange(&value, 5);
+  CHECK_EQU(5, value);
+  CHECK_EQU(k_test_val, new_value);
+}
+
+
+template <class AtomicType>
+static void TestAtomicIncrementBounds() {
+  // Test at rollover boundary between int_max and int_min.
+  AtomicType test_val =
+      static_cast<AtomicType>(1) << (NUM_BITS(AtomicType) - 1);
+  AtomicType value = -1 ^ test_val;
+  AtomicType new_value = NoBarrier_AtomicIncrement(&value, 1);
+  CHECK_EQU(test_val, value);
+  CHECK_EQU(value, new_value);
+
+  NoBarrier_AtomicIncrement(&value, -1);
+  CHECK_EQU(-1 ^ test_val, value);
+
+  // Test at 32-bit boundary for 64-bit atomic type.
+  test_val = static_cast<AtomicType>(1) << (NUM_BITS(AtomicType) / 2);
+  value = test_val - 1;
+  new_value = NoBarrier_AtomicIncrement(&value, 1);
+  CHECK_EQU(test_val, value);
+  CHECK_EQU(value, new_value);
+
+  NoBarrier_AtomicIncrement(&value, -1);
+  CHECK_EQU(test_val - 1, value);
+}
+
+
+// Return an AtomicType with the value 0xa5a5a5..
+template <class AtomicType>
+static AtomicType TestFillValue() {
+  AtomicType val = 0;
+  memset(&val, 0xa5, sizeof(AtomicType));
+  return val;
+}
+
+
+// This is a simple sanity check to ensure that values are correct.
+// Not testing atomicity.
+template <class AtomicType>
+static void TestStore() {
+  const AtomicType kVal1 = TestFillValue<AtomicType>();
+  const AtomicType kVal2 = static_cast<AtomicType>(-1);
+
+  AtomicType value;
+
+  NoBarrier_Store(&value, kVal1);
+  CHECK_EQU(kVal1, value);
+  NoBarrier_Store(&value, kVal2);
+  CHECK_EQU(kVal2, value);
+
+  Acquire_Store(&value, kVal1);
+  CHECK_EQU(kVal1, value);
+  Acquire_Store(&value, kVal2);
+  CHECK_EQU(kVal2, value);
+
+  Release_Store(&value, kVal1);
+  CHECK_EQU(kVal1, value);
+  Release_Store(&value, kVal2);
+  CHECK_EQU(kVal2, value);
+}
+
+
+// This is a simple sanity check to ensure that values are correct.
+// Not testing atomicity.
+template <class AtomicType>
+static void TestLoad() {
+  const AtomicType kVal1 = TestFillValue<AtomicType>();
+  const AtomicType kVal2 = static_cast<AtomicType>(-1);
+
+  AtomicType value;
+
+  value = kVal1;
+  CHECK_EQU(kVal1, NoBarrier_Load(&value));
+  value = kVal2;
+  CHECK_EQU(kVal2, NoBarrier_Load(&value));
+
+  value = kVal1;
+  CHECK_EQU(kVal1, Acquire_Load(&value));
+  value = kVal2;
+  CHECK_EQU(kVal2, Acquire_Load(&value));
+
+  value = kVal1;
+  CHECK_EQU(kVal1, Release_Load(&value));
+  value = kVal2;
+  CHECK_EQU(kVal2, Release_Load(&value));
+}
+
+
+TEST(AtomicIncrement) {
+  TestAtomicIncrement<Atomic32>();
+  TestAtomicIncrement<AtomicWord>();
+}
+
+
+TEST(CompareAndSwap) {
+  TestCompareAndSwap<Atomic32>();
+  TestCompareAndSwap<AtomicWord>();
+}
+
+
+TEST(AtomicExchange) {
+  TestAtomicExchange<Atomic32>();
+  TestAtomicExchange<AtomicWord>();
+}
+
+
+TEST(AtomicIncrementBounds) {
+  TestAtomicIncrementBounds<Atomic32>();
+  TestAtomicIncrementBounds<AtomicWord>();
+}
+
+
+TEST(Store) {
+  TestStore<Atomic32>();
+  TestStore<AtomicWord>();
+}
+
+
+TEST(Load) {
+  TestLoad<Atomic32>();
+  TestLoad<AtomicWord>();
+}