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92 lines
2.4 KiB
C++
92 lines
2.4 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <limits>
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#include "mojo/public/cpp/bindings/lib/bindings_serialization.h"
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#include "mojo/public/cpp/bindings/lib/fixed_buffer.h"
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#include "testing/gtest/include/gtest/gtest.h"
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namespace mojo {
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namespace test {
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namespace {
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bool IsZero(void* p_buf, size_t size) {
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char* buf = reinterpret_cast<char*>(p_buf);
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for (size_t i = 0; i < size; ++i) {
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if (buf[i] != 0)
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return false;
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}
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return true;
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}
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// Tests that FixedBuffer allocates memory aligned to 8 byte boundaries.
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TEST(FixedBufferTest, Alignment) {
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internal::FixedBuffer buf(internal::Align(10) * 2);
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ASSERT_EQ(buf.size(), 16u * 2);
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void* a = buf.Allocate(10);
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ASSERT_TRUE(a);
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EXPECT_TRUE(IsZero(a, 10));
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EXPECT_EQ(0, reinterpret_cast<ptrdiff_t>(a) % 8);
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void* b = buf.Allocate(10);
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ASSERT_TRUE(b);
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EXPECT_TRUE(IsZero(b, 10));
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EXPECT_EQ(0, reinterpret_cast<ptrdiff_t>(b) % 8);
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// Any more allocations would result in an assert, but we can't test that.
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}
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// Tests that FixedBuffer::Leak passes ownership to the caller.
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TEST(FixedBufferTest, Leak) {
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void* ptr = nullptr;
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void* buf_ptr = nullptr;
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{
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internal::FixedBuffer buf(8);
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ASSERT_EQ(8u, buf.size());
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ptr = buf.Allocate(8);
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ASSERT_TRUE(ptr);
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buf_ptr = buf.Leak();
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// The buffer should point to the first element allocated.
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// TODO(mpcomplete): Is this a reasonable expectation?
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EXPECT_EQ(ptr, buf_ptr);
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// The FixedBuffer should be empty now.
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EXPECT_EQ(0u, buf.size());
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EXPECT_FALSE(buf.Leak());
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}
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// Since we called Leak, ptr is still writable after FixedBuffer went out of
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// scope.
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memset(ptr, 1, 8);
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free(buf_ptr);
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}
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#if defined(NDEBUG) && !defined(DCHECK_ALWAYS_ON)
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TEST(FixedBufferTest, TooBig) {
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internal::FixedBuffer buf(24);
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// A little bit too large.
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EXPECT_EQ(reinterpret_cast<void*>(0), buf.Allocate(32));
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// Move the cursor forward.
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EXPECT_NE(reinterpret_cast<void*>(0), buf.Allocate(16));
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// A lot too large.
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EXPECT_EQ(reinterpret_cast<void*>(0),
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buf.Allocate(std::numeric_limits<size_t>::max() - 1024u));
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// A lot too large, leading to possible integer overflow.
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EXPECT_EQ(reinterpret_cast<void*>(0),
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buf.Allocate(std::numeric_limits<size_t>::max() - 8u));
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}
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#endif
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} // namespace
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} // namespace test
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} // namespace mojo
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