Daniel Andersson
e7fb1c8516
Using volatile on a word size location will generate a single move instruction without order guarantees and is supported on all compilers. Replace FetchAndAdd with FetchAndDecrement, since the latter is sufficient and eaiser to implement portably (in particular on some Windows setups). BUG=https://github.com/dart-lang/sdk/issues/24049 R=iposva@google.com Review URL: https://codereview.chromium.org//1287853005 .
35 lines
904 B
C++
35 lines
904 B
C++
// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "platform/assert.h"
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#include "platform/utils.h"
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#include "vm/atomic.h"
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#include "vm/globals.h"
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#include "vm/unit_test.h"
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namespace dart {
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UNIT_TEST_CASE(FetchAndIncrement) {
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uintptr_t v = 42;
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EXPECT_EQ(static_cast<uintptr_t>(42),
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AtomicOperations::FetchAndIncrement(&v));
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EXPECT_EQ(static_cast<uintptr_t>(43), v);
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}
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UNIT_TEST_CASE(FetchAndDecrement) {
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uintptr_t v = 42;
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EXPECT_EQ(static_cast<uintptr_t>(42),
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AtomicOperations::FetchAndDecrement(&v));
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EXPECT_EQ(static_cast<uintptr_t>(41), v);
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}
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UNIT_TEST_CASE(LoadRelaxed) {
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uword v = 42;
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EXPECT_EQ(static_cast<uword>(42), AtomicOperations::LoadRelaxed(&v));
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}
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} // namespace dart
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