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[controls] fix memory leak in VisualElement.Background
#13656
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152 changes: 152 additions & 0 deletions
152
src/Controls/src/Core/Internals/MaybeNullWhenAttribute.cs
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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. | ||
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// This was copied from https://github.com/dotnet/runtime/blob/39b9607807f29e48cae4652cd74735182b31182e/src/libraries/System.Private.CoreLib/src/System/Diagnostics/CodeAnalysis/NullableAttributes.cs | ||
// and updated to have the scope of the attributes be internal. | ||
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#nullable disable | ||
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namespace System.Diagnostics.CodeAnalysis | ||
{ | ||
#if !NETCOREAPP | ||
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/// <summary>Specifies that null is allowed as an input even if the corresponding type disallows it.</summary> | ||
[AttributeUsage(AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.Property, Inherited = false)] | ||
internal sealed class AllowNullAttribute : Attribute { } | ||
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/// <summary>Specifies that null is disallowed as an input even if the corresponding type allows it.</summary> | ||
[AttributeUsage(AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.Property, Inherited = false)] | ||
internal sealed class DisallowNullAttribute : Attribute { } | ||
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/// <summary>Specifies that an output may be null even if the corresponding type disallows it.</summary> | ||
[AttributeUsage(AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.Property | AttributeTargets.ReturnValue, Inherited = false)] | ||
internal sealed class MaybeNullAttribute : Attribute { } | ||
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/// <summary>Specifies that an output will not be null even if the corresponding type allows it.</summary> | ||
[AttributeUsage(AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.Property | AttributeTargets.ReturnValue, Inherited = false)] | ||
internal sealed class NotNullAttribute : Attribute { } | ||
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/// <summary>Specifies that when a method returns <see cref="ReturnValue"/>, the parameter may be null even if the corresponding type disallows it.</summary> | ||
[AttributeUsage(AttributeTargets.Parameter, Inherited = false)] | ||
internal sealed class MaybeNullWhenAttribute : Attribute | ||
{ | ||
/// <summary>Initializes the attribute with the specified return value condition.</summary> | ||
/// <param name="returnValue"> | ||
/// The return value condition. If the method returns this value, the associated parameter may be null. | ||
/// </param> | ||
public MaybeNullWhenAttribute(bool returnValue) => ReturnValue = returnValue; | ||
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/// <summary>Gets the return value condition.</summary> | ||
public bool ReturnValue { get; } | ||
} | ||
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/// <summary>Specifies that when a method returns <see cref="ReturnValue"/>, the parameter will not be null even if the corresponding type allows it.</summary> | ||
[AttributeUsage(AttributeTargets.Parameter, Inherited = false)] | ||
internal sealed class NotNullWhenAttribute : Attribute | ||
{ | ||
/// <summary>Initializes the attribute with the specified return value condition.</summary> | ||
/// <param name="returnValue"> | ||
/// The return value condition. If the method returns this value, the associated parameter will not be null. | ||
/// </param> | ||
public NotNullWhenAttribute(bool returnValue) => ReturnValue = returnValue; | ||
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/// <summary>Gets the return value condition.</summary> | ||
public bool ReturnValue { get; } | ||
} | ||
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/// <summary>Specifies that the output will be non-null if the named parameter is non-null.</summary> | ||
[AttributeUsage(AttributeTargets.Parameter | AttributeTargets.Property | AttributeTargets.ReturnValue, AllowMultiple = true, Inherited = false)] | ||
internal sealed class NotNullIfNotNullAttribute : Attribute | ||
{ | ||
/// <summary>Initializes the attribute with the associated parameter name.</summary> | ||
/// <param name="parameterName"> | ||
/// The associated parameter name. The output will be non-null if the argument to the parameter specified is non-null. | ||
/// </param> | ||
public NotNullIfNotNullAttribute(string parameterName) => ParameterName = parameterName; | ||
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/// <summary>Gets the associated parameter name.</summary> | ||
public string ParameterName { get; } | ||
} | ||
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/// <summary>Applied to a method that will never return under any circumstance.</summary> | ||
[AttributeUsage(AttributeTargets.Method, Inherited = false)] | ||
internal sealed class DoesNotReturnAttribute : Attribute { } | ||
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/// <summary>Specifies that the method will not return if the associated Boolean parameter is passed the specified value.</summary> | ||
[AttributeUsage(AttributeTargets.Parameter, Inherited = false)] | ||
internal sealed class DoesNotReturnIfAttribute : Attribute | ||
{ | ||
/// <summary>Initializes the attribute with the specified parameter value.</summary> | ||
/// <param name="parameterValue"> | ||
/// The condition parameter value. Code after the method will be considered unreachable by diagnostics if the argument to | ||
/// the associated parameter matches this value. | ||
/// </param> | ||
public DoesNotReturnIfAttribute(bool parameterValue) => ParameterValue = parameterValue; | ||
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/// <summary>Gets the condition parameter value.</summary> | ||
public bool ParameterValue { get; } | ||
} | ||
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#endif | ||
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#if !NETCOREAPP || NETCOREAPP3_1 | ||
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/// <summary>Specifies that the method or property will ensure that the listed field and property members have not-null values.</summary> | ||
[AttributeUsage(AttributeTargets.Method | AttributeTargets.Property, Inherited = false, AllowMultiple = true)] | ||
internal sealed class MemberNotNullAttribute : Attribute | ||
{ | ||
/// <summary>Initializes the attribute with a field or property member.</summary> | ||
/// <param name="member"> | ||
/// The field or property member that is promised to be not-null. | ||
/// </param> | ||
public MemberNotNullAttribute(string member) => Members = new[] { member }; | ||
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/// <summary>Initializes the attribute with the list of field and property members.</summary> | ||
/// <param name="members"> | ||
/// The list of field and property members that are promised to be not-null. | ||
/// </param> | ||
public MemberNotNullAttribute(params string[] members) => Members = members; | ||
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/// <summary>Gets field or property member names.</summary> | ||
public string[] Members { get; } | ||
} | ||
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/// <summary>Specifies that the method or property will ensure that the listed field and property members have not-null values when returning with the specified return value condition.</summary> | ||
[AttributeUsage(AttributeTargets.Method | AttributeTargets.Property, Inherited = false, AllowMultiple = true)] | ||
internal sealed class MemberNotNullWhenAttribute : Attribute | ||
{ | ||
/// <summary>Initializes the attribute with the specified return value condition and a field or property member.</summary> | ||
/// <param name="returnValue"> | ||
/// The return value condition. If the method returns this value, the associated parameter will not be null. | ||
/// </param> | ||
/// <param name="member"> | ||
/// The field or property member that is promised to be not-null. | ||
/// </param> | ||
public MemberNotNullWhenAttribute(bool returnValue, string member) | ||
{ | ||
ReturnValue = returnValue; | ||
Members = new[] { member }; | ||
} | ||
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/// <summary>Initializes the attribute with the specified return value condition and list of field and property members.</summary> | ||
/// <param name="returnValue"> | ||
/// The return value condition. If the method returns this value, the associated parameter will not be null. | ||
/// </param> | ||
/// <param name="members"> | ||
/// The list of field and property members that are promised to be not-null. | ||
/// </param> | ||
public MemberNotNullWhenAttribute(bool returnValue, params string[] members) | ||
{ | ||
ReturnValue = returnValue; | ||
Members = members; | ||
} | ||
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/// <summary>Gets the return value condition.</summary> | ||
public bool ReturnValue { get; } | ||
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/// <summary>Gets field or property member names.</summary> | ||
public string[] Members { get; } | ||
} | ||
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#endif | ||
} |
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I got this from:
https://source.dot.net/#Microsoft.Build.Framework/NullableAttributes.cs,68093cc4b5713519
So we can use these NRT annotations in a
netstandard2.0
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We did bad things in essentials:
One day this can all go away and we use net6/7 everywhere.