23cc6be3fc
This is consistent with C++ memory model and avoids confusion with GC write barrier. BUG= Review-Url: https://codereview.chromium.org/2912773002 Cr-Commit-Position: refs/heads/master@{#45584}
290 lines
8.3 KiB
C++
290 lines
8.3 KiB
C++
// Copyright 2014 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "src/v8.h"
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#include "src/base/atomicops.h"
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#include "test/cctest/cctest.h"
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using namespace v8::base;
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using namespace v8::internal;
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#define CHECK_EQU(v1, v2) \
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CHECK_EQ(static_cast<int64_t>(v1), static_cast<int64_t>(v2))
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#define NUM_BITS(T) (sizeof(T) * 8)
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template <class AtomicType>
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static void TestAtomicIncrement() {
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// For now, we just test the single-threaded execution.
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// Use a guard value to make sure that Relaxed_AtomicIncrement doesn't
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// go outside the expected address bounds. This is to test that the
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// 32-bit Relaxed_AtomicIncrement doesn't do the wrong thing on 64-bit
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// machines.
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struct {
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AtomicType prev_word;
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AtomicType count;
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AtomicType next_word;
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} s;
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AtomicType prev_word_value, next_word_value;
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memset(&prev_word_value, 0xFF, sizeof(AtomicType));
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memset(&next_word_value, 0xEE, sizeof(AtomicType));
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s.prev_word = prev_word_value;
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s.count = 0;
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s.next_word = next_word_value;
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CHECK_EQU(Relaxed_AtomicIncrement(&s.count, 1), 1);
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CHECK_EQU(s.count, 1);
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CHECK_EQU(s.prev_word, prev_word_value);
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CHECK_EQU(s.next_word, next_word_value);
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CHECK_EQU(Relaxed_AtomicIncrement(&s.count, 2), 3);
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CHECK_EQU(s.count, 3);
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CHECK_EQU(s.prev_word, prev_word_value);
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CHECK_EQU(s.next_word, next_word_value);
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CHECK_EQU(Relaxed_AtomicIncrement(&s.count, 3), 6);
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CHECK_EQU(s.count, 6);
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CHECK_EQU(s.prev_word, prev_word_value);
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CHECK_EQU(s.next_word, next_word_value);
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CHECK_EQU(Relaxed_AtomicIncrement(&s.count, -3), 3);
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CHECK_EQU(s.count, 3);
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CHECK_EQU(s.prev_word, prev_word_value);
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CHECK_EQU(s.next_word, next_word_value);
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CHECK_EQU(Relaxed_AtomicIncrement(&s.count, -2), 1);
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CHECK_EQU(s.count, 1);
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CHECK_EQU(s.prev_word, prev_word_value);
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CHECK_EQU(s.next_word, next_word_value);
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CHECK_EQU(Relaxed_AtomicIncrement(&s.count, -1), 0);
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CHECK_EQU(s.count, 0);
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CHECK_EQU(s.prev_word, prev_word_value);
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CHECK_EQU(s.next_word, next_word_value);
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CHECK_EQU(Relaxed_AtomicIncrement(&s.count, -1), -1);
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CHECK_EQU(s.count, -1);
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CHECK_EQU(s.prev_word, prev_word_value);
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CHECK_EQU(s.next_word, next_word_value);
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CHECK_EQU(Relaxed_AtomicIncrement(&s.count, -4), -5);
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CHECK_EQU(s.count, -5);
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CHECK_EQU(s.prev_word, prev_word_value);
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CHECK_EQU(s.next_word, next_word_value);
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CHECK_EQU(Relaxed_AtomicIncrement(&s.count, 5), 0);
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CHECK_EQU(s.count, 0);
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CHECK_EQU(s.prev_word, prev_word_value);
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CHECK_EQU(s.next_word, next_word_value);
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}
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template <class AtomicType>
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static void TestCompareAndSwap() {
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AtomicType value = 0;
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AtomicType prev = Relaxed_CompareAndSwap(&value, 0, 1);
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CHECK_EQU(1, value);
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CHECK_EQU(0, prev);
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// Use a test value that has non-zero bits in both halves, for testing
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// the 64-bit implementation on 32-bit platforms.
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const AtomicType k_test_val =
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(static_cast<AtomicType>(1) << (NUM_BITS(AtomicType) - 2)) + 11;
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value = k_test_val;
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prev = Relaxed_CompareAndSwap(&value, 0, 5);
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CHECK_EQU(k_test_val, value);
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CHECK_EQU(k_test_val, prev);
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value = k_test_val;
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prev = Relaxed_CompareAndSwap(&value, k_test_val, 5);
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CHECK_EQU(5, value);
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CHECK_EQU(k_test_val, prev);
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}
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template <class AtomicType>
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static void TestAtomicExchange() {
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AtomicType value = 0;
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AtomicType new_value = Relaxed_AtomicExchange(&value, 1);
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CHECK_EQU(1, value);
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CHECK_EQU(0, new_value);
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// Use a test value that has non-zero bits in both halves, for testing
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// the 64-bit implementation on 32-bit platforms.
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const AtomicType k_test_val =
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(static_cast<AtomicType>(1) << (NUM_BITS(AtomicType) - 2)) + 11;
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value = k_test_val;
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new_value = Relaxed_AtomicExchange(&value, k_test_val);
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CHECK_EQU(k_test_val, value);
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CHECK_EQU(k_test_val, new_value);
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value = k_test_val;
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new_value = Relaxed_AtomicExchange(&value, 5);
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CHECK_EQU(5, value);
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CHECK_EQU(k_test_val, new_value);
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}
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template <class AtomicType>
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static void TestAtomicIncrementBounds() {
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// Test at 32-bit boundary for 64-bit atomic type.
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AtomicType test_val = static_cast<AtomicType>(1)
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<< (NUM_BITS(AtomicType) / 2);
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AtomicType value = test_val - 1;
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AtomicType new_value = Relaxed_AtomicIncrement(&value, 1);
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CHECK_EQU(test_val, value);
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CHECK_EQU(value, new_value);
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Relaxed_AtomicIncrement(&value, -1);
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CHECK_EQU(test_val - 1, value);
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}
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// Return an AtomicType with the value 0xa5a5a5..
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template <class AtomicType>
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static AtomicType TestFillValue() {
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AtomicType val = 0;
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memset(&val, 0xa5, sizeof(AtomicType));
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return val;
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}
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// This is a simple sanity check to ensure that values are correct.
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// Not testing atomicity.
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template <class AtomicType>
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static void TestStore() {
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const AtomicType kVal1 = TestFillValue<AtomicType>();
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const AtomicType kVal2 = static_cast<AtomicType>(-1);
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AtomicType value;
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Relaxed_Store(&value, kVal1);
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CHECK_EQU(kVal1, value);
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Relaxed_Store(&value, kVal2);
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CHECK_EQU(kVal2, value);
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Release_Store(&value, kVal1);
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CHECK_EQU(kVal1, value);
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Release_Store(&value, kVal2);
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CHECK_EQU(kVal2, value);
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}
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// Merge this test with TestStore as soon as we have Atomic8 acquire
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// and release stores.
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static void TestStoreAtomic8() {
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const Atomic8 kVal1 = TestFillValue<Atomic8>();
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const Atomic8 kVal2 = static_cast<Atomic8>(-1);
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Atomic8 value;
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Relaxed_Store(&value, kVal1);
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CHECK_EQU(kVal1, value);
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Relaxed_Store(&value, kVal2);
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CHECK_EQU(kVal2, value);
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}
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// This is a simple sanity check to ensure that values are correct.
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// Not testing atomicity.
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template <class AtomicType>
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static void TestLoad() {
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const AtomicType kVal1 = TestFillValue<AtomicType>();
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const AtomicType kVal2 = static_cast<AtomicType>(-1);
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AtomicType value;
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value = kVal1;
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CHECK_EQU(kVal1, Relaxed_Load(&value));
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value = kVal2;
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CHECK_EQU(kVal2, Relaxed_Load(&value));
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value = kVal1;
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CHECK_EQU(kVal1, Acquire_Load(&value));
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value = kVal2;
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CHECK_EQU(kVal2, Acquire_Load(&value));
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}
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// Merge this test with TestLoad as soon as we have Atomic8 acquire
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// and release loads.
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static void TestLoadAtomic8() {
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const Atomic8 kVal1 = TestFillValue<Atomic8>();
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const Atomic8 kVal2 = static_cast<Atomic8>(-1);
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Atomic8 value;
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value = kVal1;
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CHECK_EQU(kVal1, Relaxed_Load(&value));
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value = kVal2;
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CHECK_EQU(kVal2, Relaxed_Load(&value));
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}
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TEST(AtomicIncrement) {
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TestAtomicIncrement<Atomic32>();
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TestAtomicIncrement<AtomicWord>();
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}
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TEST(CompareAndSwap) {
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TestCompareAndSwap<Atomic32>();
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TestCompareAndSwap<AtomicWord>();
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}
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TEST(AtomicExchange) {
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TestAtomicExchange<Atomic32>();
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TestAtomicExchange<AtomicWord>();
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}
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TEST(AtomicIncrementBounds) {
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TestAtomicIncrementBounds<Atomic32>();
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TestAtomicIncrementBounds<AtomicWord>();
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}
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TEST(Store) {
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TestStoreAtomic8();
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TestStore<Atomic32>();
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TestStore<AtomicWord>();
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}
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TEST(Load) {
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TestLoadAtomic8();
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TestLoad<Atomic32>();
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TestLoad<AtomicWord>();
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}
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