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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using Xunit;
using System.Runtime.CompilerServices;
using static System.TestHelpers;
namespace System.SpanTests
{
public static partial class SpanTests
{
[Fact]
public static void ClearEmpty()
{
var span = Span<byte>.Empty;
span.Clear();
}
[Fact]
public static void ClearEmptyWithReference()
{
var span = Span<string>.Empty;
span.Clear();
}
[Fact]
public static void ClearByteLonger()
{
const byte initial = 5;
var actual = new byte[2048];
for (int i = 0; i < actual.Length; i++)
{
actual[i] = initial;
}
var expected = new byte[actual.Length];
var span = new Span<byte>(actual);
span.Clear();
Assert.Equal<byte>(expected, actual);
}
[Fact]
public static void ClearByteUnaligned()
{
const byte initial = 5;
const int length = 32;
var actualFull = new byte[length];
for (int i = 0; i < length; i++)
{
actualFull[i] = initial;
}
var expectedFull = new byte[length];
var start = 1;
var expectedSpan = new Span<byte>(expectedFull, start, length - start - 1);
var actualSpan = new Span<byte>(actualFull, start, length - start - 1);
actualSpan.Clear();
byte[] actual = actualSpan.ToArray();
byte[] expected = expectedSpan.ToArray();
Assert.Equal<byte>(expected, actual);
Assert.Equal(initial, actualFull[0]);
Assert.Equal(initial, actualFull[length - 1]);
}
[Fact]
public unsafe static void ClearByteUnalignedFixed()
{
const byte initial = 5;
const int length = 32;
var actualFull = new byte[length];
for (int i = 0; i < length; i++)
{
actualFull[i] = initial;
}
var expectedFull = new byte[length];
var start = 1;
var expectedSpan = new Span<byte>(expectedFull, start, length - start - 1);
fixed (byte* p = actualFull)
{
var actualSpan = new Span<byte>(p + start, length - start - 1);
actualSpan.Clear();
byte[] actual = actualSpan.ToArray();
byte[] expected = expectedSpan.ToArray();
Assert.Equal<byte>(expected, actual);
Assert.Equal(initial, actualFull[0]);
Assert.Equal(initial, actualFull[length - 1]);
}
}
[Fact]
public static void ClearIntPtrOffset()
{
IntPtr initial = IntPtr.Zero + 5;
const int length = 32;
var actualFull = new IntPtr[length];
for (int i = 0; i < length; i++)
{
actualFull[i] = initial;
}
var expectedFull = new IntPtr[length];
var start = 2;
var expectedSpan = new Span<IntPtr>(expectedFull, start, length - start - 1);
var actualSpan = new Span<IntPtr>(actualFull, start, length - start - 1);
actualSpan.Clear();
IntPtr[] actual = actualSpan.ToArray();
IntPtr[] expected = expectedSpan.ToArray();
Assert.Equal<IntPtr>(expected, actual);
Assert.Equal(initial, actualFull[0]);
Assert.Equal(initial, actualFull[length - 1]);
}
[Fact]
public static void ClearIntPtrLonger()
{
IntPtr initial = IntPtr.Zero + 5;
var actual = new IntPtr[2048];
for (int i = 0; i < actual.Length; i++)
{
actual[i] = initial;
}
var expected = new IntPtr[actual.Length];
var span = new Span<IntPtr>(actual);
span.Clear();
Assert.Equal<IntPtr>(expected, actual);
}
[Fact]
public static void ClearValueTypeWithoutReferences()
{
int[] actual = { 1, 2, 3 };
int[] expected = { 0, 0, 0 };
var span = new Span<int>(actual);
span.Clear();
Assert.Equal<int>(expected, actual);
}
[Fact]
public static void ClearValueTypeWithoutReferencesLonger()
{
int[] actual = new int[2048];
for (int i = 0; i < actual.Length; i++)
{
actual[i] = i + 1;
}
int[] expected = new int[actual.Length];
var span = new Span<int>(actual);
span.Clear();
Assert.Equal<int>(expected, actual);
}
[Fact]
public static void ClearValueTypeWithoutReferencesPointerSize()
{
long[] actual = new long[15];
for (int i = 0; i < actual.Length; i++)
{
actual[i] = i + 1;
}
long[] expected = new long[actual.Length];
var span = new Span<long>(actual);
span.Clear();
Assert.Equal<long>(expected, actual);
}
[Fact]
public static void ClearReferenceType()
{
string[] actual = { "a", "b", "c" };
string[] expected = { null, null, null };
var span = new Span<string>(actual);
span.Clear();
Assert.Equal<string>(expected, actual);
}
[Fact]
public static void ClearReferenceTypeLonger()
{
string[] actual = new string[2048];
for (int i = 0; i < actual.Length; i++)
{
actual[i] = (i + 1).ToString();
}
string[] expected = new string[actual.Length];
var span = new Span<string>(actual);
span.Clear();
Assert.Equal<string>(expected, actual);
}
[Fact]
public static void ClearEnumType()
{
TestEnum[] actual = { TestEnum.e0, TestEnum.e1, TestEnum.e2 };
TestEnum[] expected = { default, default, default };
var span = new Span<TestEnum>(actual);
span.Clear();
Assert.Equal<TestEnum>(expected, actual);
}
[Fact]
public static void ClearValueTypeWithReferences()
{
TestValueTypeWithReference[] actual = {
new TestValueTypeWithReference() { I = 1, S = "a" },
new TestValueTypeWithReference() { I = 2, S = "b" },
new TestValueTypeWithReference() { I = 3, S = "c" } };
TestValueTypeWithReference[] expected = {
default,
default,
default };
var span = new Span<TestValueTypeWithReference>(actual);
span.Clear();
Assert.Equal<TestValueTypeWithReference>(expected, actual);
}
// NOTE: ClearLongerThanUintMaxValueBytes test is constrained to run on Windows and MacOSX because it causes
// problems on Linux due to the way deferred memory allocation works. On Linux, the allocation can
// succeed even if there is not enough memory but then the test may get killed by the OOM killer at the
// time the memory is accessed which triggers the full memory allocation.
[Fact]
[OuterLoop]
[PlatformSpecific(TestPlatforms.Windows | TestPlatforms.OSX)]
unsafe static void ClearLongerThanUintMaxValueBytes()
{
if (sizeof(IntPtr) == sizeof(long))
{
// Arrange
IntPtr bytes = (IntPtr)(((long)int.MaxValue) * sizeof(int));
int length = (int)(((long)bytes) / sizeof(int));
if (!AllocationHelper.TryAllocNative(bytes, out IntPtr memory))
{
Console.WriteLine($"Span.Clear test {nameof(ClearLongerThanUintMaxValueBytes)} skipped (could not alloc memory).");
return;
}
try
{
ref int data = ref Unsafe.AsRef<int>(memory.ToPointer());
int initial = 5;
for (int i = 0; i < length; i++)
{
Unsafe.Add(ref data, i) = initial;
}
Span<int> span = new Span<int>(memory.ToPointer(), length);
// Act
span.Clear();
// Assert using custom code for perf and to avoid allocating extra memory
for (int i = 0; i < length; i++)
{
var actual = Unsafe.Add(ref data, i);
if (actual != 0)
{
Assert.Equal(0, actual);
}
}
}
finally
{
AllocationHelper.ReleaseNative(ref memory);
}
}
}
}
}
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