Annotate the library with trimming attributes

src/LegacySupport/DynamicDependencyAttribute.cs

@@ -0,0 +1,136 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+#pragma warning disable IDE0079
+#pragma warning disable SA1101
+#pragma warning disable SA1116
+#pragma warning disable SA1117
+#pragma warning disable SA1512
+#pragma warning disable SA1623
+#pragma warning disable SA1642
+#pragma warning disable S3903
+
+namespace System.Diagnostics.CodeAnalysis;
+
+/// <summary>
+/// States a dependency that one member has on another.
+/// </summary>
+/// <remarks>
+/// This can be used to inform tooling of a dependency that is otherwise not evident purely from
+/// metadata and IL, for example a member relied on via reflection.
+/// </remarks>
+[AttributeUsage(
+    AttributeTargets.Constructor | AttributeTargets.Field | AttributeTargets.Method,
+    AllowMultiple = true, Inherited = false)]
+[ExcludeFromCodeCoverage]
+internal sealed class DynamicDependencyAttribute : Attribute
+{
+    /// <summary>
+    /// Initializes a new instance of the <see cref="DynamicDependencyAttribute"/> class
+    /// with the specified signature of a member on the same type as the consumer.
+    /// </summary>
+    /// <param name="memberSignature">The signature of the member depended on.</param>
+    public DynamicDependencyAttribute(string memberSignature) => MemberSignature = memberSignature;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="DynamicDependencyAttribute"/> class
+    /// with the specified signature of a member on a <see cref="System.Type"/>.
+    /// </summary>
+    /// <param name="memberSignature">The signature of the member depended on.</param>
+    /// <param name="type">The <see cref="System.Type"/> containing <paramref name="memberSignature"/>.</param>
+    public DynamicDependencyAttribute(string memberSignature, Type type)
+    {
+        MemberSignature = memberSignature;
+        Type = type;
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="DynamicDependencyAttribute"/> class
+    /// with the specified signature of a member on a type in an assembly.
+    /// </summary>
+    /// <param name="memberSignature">The signature of the member depended on.</param>
+    /// <param name="typeName">The full name of the type containing the specified member.</param>
+    /// <param name="assemblyName">The assembly name of the type containing the specified member.</param>
+    public DynamicDependencyAttribute(string memberSignature, string typeName, string assemblyName)
+    {
+        MemberSignature = memberSignature;
+        TypeName = typeName;
+        AssemblyName = assemblyName;
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="DynamicDependencyAttribute"/> class
+    /// with the specified types of members on a <see cref="System.Type"/>.
+    /// </summary>
+    /// <param name="memberTypes">The types of members depended on.</param>
+    /// <param name="type">The <see cref="System.Type"/> containing the specified members.</param>
+    public DynamicDependencyAttribute(DynamicallyAccessedMemberTypes memberTypes, Type type)
+    {
+        MemberTypes = memberTypes;
+        Type = type;
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="DynamicDependencyAttribute"/> class
+    /// with the specified types of members on a type in an assembly.
+    /// </summary>
+    /// <param name="memberTypes">The types of members depended on.</param>
+    /// <param name="typeName">The full name of the type containing the specified members.</param>
+    /// <param name="assemblyName">The assembly name of the type containing the specified members.</param>
+    public DynamicDependencyAttribute(DynamicallyAccessedMemberTypes memberTypes, string typeName, string assemblyName)
+    {
+        MemberTypes = memberTypes;
+        TypeName = typeName;
+        AssemblyName = assemblyName;
+    }
+
+    /// <summary>
+    /// Gets the signature of the member depended on.
+    /// </summary>
+    /// <remarks>
+    /// Either <see cref="MemberSignature"/> must be a valid string or <see cref="MemberTypes"/>
+    /// must not equal <see cref="DynamicallyAccessedMemberTypes.None"/>, but not both.
+    /// </remarks>
+    public string? MemberSignature { get; }
+
+    /// <summary>
+    /// Gets the <see cref="DynamicallyAccessedMemberTypes"/> which specifies the type
+    /// of members depended on.
+    /// </summary>
+    /// <remarks>
+    /// Either <see cref="MemberSignature"/> must be a valid string or <see cref="MemberTypes"/>
+    /// must not equal <see cref="DynamicallyAccessedMemberTypes.None"/>, but not both.
+    /// </remarks>
+    public DynamicallyAccessedMemberTypes MemberTypes { get; }
+
+    /// <summary>
+    /// Gets the <see cref="System.Type"/> containing the specified member.
+    /// </summary>
+    /// <remarks>
+    /// If neither <see cref="Type"/> nor <see cref="TypeName"/> are specified,
+    /// the type of the consumer is assumed.
+    /// </remarks>
+    public Type? Type { get; }
+
+    /// <summary>
+    /// Gets the full name of the type containing the specified member.
+    /// </summary>
+    /// <remarks>
+    /// If neither <see cref="Type"/> nor <see cref="TypeName"/> are specified,
+    /// the type of the consumer is assumed.
+    /// </remarks>
+    public string? TypeName { get; }
+
+    /// <summary>
+    /// Gets the assembly name of the specified type.
+    /// </summary>
+    /// <remarks>
+    /// <see cref="AssemblyName"/> is only valid when <see cref="TypeName"/> is specified.
+    /// </remarks>
+    public string? AssemblyName { get; }
+
+    /// <summary>
+    /// Gets or sets the condition in which the dependency is applicable, e.g. "DEBUG".
+    /// </summary>
+    public string? Condition { get; set; }
+}

src/LegacySupport/DynamicallyAccessedMemberTypes.cs

@@ -0,0 +1,100 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+#pragma warning disable IDE0079
+#pragma warning disable CA2217
+#pragma warning disable SA1413
+#pragma warning disable SA1512
+#pragma warning disable S4070
+
+namespace System.Diagnostics.CodeAnalysis;
+
+/// <summary>
+/// Specifies the types of members that are dynamically accessed.
+///
+/// This enumeration has a <see cref="FlagsAttribute"/> attribute that allows a
+/// bitwise combination of its member values.
+/// </summary>
+[Flags]
+internal enum DynamicallyAccessedMemberTypes
+{
+    /// <summary>
+    /// Specifies no members.
+    /// </summary>
+    None = 0,
+
+    /// <summary>
+    /// Specifies the default, parameterless public constructor.
+    /// </summary>
+    PublicParameterlessConstructor = 0x0001,
+
+    /// <summary>
+    /// Specifies all public constructors.
+    /// </summary>
+    PublicConstructors = 0x0002 | PublicParameterlessConstructor,
+
+    /// <summary>
+    /// Specifies all non-public constructors.
+    /// </summary>
+    NonPublicConstructors = 0x0004,
+
+    /// <summary>
+    /// Specifies all public methods.
+    /// </summary>
+    PublicMethods = 0x0008,
+
+    /// <summary>
+    /// Specifies all non-public methods.
+    /// </summary>
+    NonPublicMethods = 0x0010,
+
+    /// <summary>
+    /// Specifies all public fields.
+    /// </summary>
+    PublicFields = 0x0020,
+
+    /// <summary>
+    /// Specifies all non-public fields.
+    /// </summary>
+    NonPublicFields = 0x0040,
+
+    /// <summary>
+    /// Specifies all public nested types.
+    /// </summary>
+    PublicNestedTypes = 0x0080,
+
+    /// <summary>
+    /// Specifies all non-public nested types.
+    /// </summary>
+    NonPublicNestedTypes = 0x0100,
+
+    /// <summary>
+    /// Specifies all public properties.
+    /// </summary>
+    PublicProperties = 0x0200,
+
+    /// <summary>
+    /// Specifies all non-public properties.
+    /// </summary>
+    NonPublicProperties = 0x0400,
+
+    /// <summary>
+    /// Specifies all public events.
+    /// </summary>
+    PublicEvents = 0x0800,
+
+    /// <summary>
+    /// Specifies all non-public events.
+    /// </summary>
+    NonPublicEvents = 0x1000,
+
+    /// <summary>
+    /// Specifies all interfaces implemented by the type.
+    /// </summary>
+    Interfaces = 0x2000,
+
+    /// <summary>
+    /// Specifies all members.
+    /// </summary>
+    All = ~None
+}

src/LegacySupport/DynamicallyAccessedMembersAttribute.cs

@@ -0,0 +1,57 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+#pragma warning disable IDE0079
+#pragma warning disable SA1101
+#pragma warning disable SA1116
+#pragma warning disable SA1117
+#pragma warning disable SA1512
+#pragma warning disable SA1623
+#pragma warning disable SA1642
+#pragma warning disable S3903
+
+namespace System.Diagnostics.CodeAnalysis;
+
+/// <summary>
+/// Indicates that certain members on a specified <see cref="Type"/> are accessed dynamically,
+/// for example through <see cref="System.Reflection"/>.
+/// </summary>
+/// <remarks>
+/// This allows tools to understand which members are being accessed during the execution
+/// of a program.
+///
+/// This attribute is valid on members whose type is <see cref="Type"/> or <see cref="string"/>.
+///
+/// When this attribute is applied to a location of type <see cref="string"/>, the assumption is
+/// that the string represents a fully qualified type name.
+///
+/// When this attribute is applied to a class, interface, or struct, the members specified
+/// can be accessed dynamically on <see cref="Type"/> instances returned from calling
+/// <see cref="object.GetType"/> on instances of that class, interface, or struct.
+///
+/// If the attribute is applied to a method it's treated as a special case and it implies
+/// the attribute should be applied to the "this" parameter of the method. As such the attribute
+/// should only be used on instance methods of types assignable to System.Type (or string, but no methods
+/// will use it there).
+/// </remarks>
+[AttributeUsage(
+    AttributeTargets.Field | AttributeTargets.ReturnValue | AttributeTargets.GenericParameter |
+    AttributeTargets.Parameter | AttributeTargets.Property | AttributeTargets.Method |
+    AttributeTargets.Class | AttributeTargets.Interface | AttributeTargets.Struct,
+    Inherited = false)]
+[ExcludeFromCodeCoverage]
+internal sealed class DynamicallyAccessedMembersAttribute : Attribute
+{
+    /// <summary>
+    /// Initializes a new instance of the <see cref="DynamicallyAccessedMembersAttribute"/> class
+    /// with the specified member types.
+    /// </summary>
+    /// <param name="memberTypes">The types of members dynamically accessed.</param>
+    public DynamicallyAccessedMembersAttribute(DynamicallyAccessedMemberTypes memberTypes) => MemberTypes = memberTypes;
+
+    /// <summary>
+    /// Gets the <see cref="DynamicallyAccessedMemberTypes"/> which specifies the type
+    /// of members dynamically accessed.
+    /// </summary>
+    public DynamicallyAccessedMemberTypes MemberTypes { get; }
+}

src/LegacySupport/RequiresUnreferencedCodeAttribute.cs

@@ -0,0 +1,47 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+#pragma warning disable IDE0079
+#pragma warning disable SA1101
+#pragma warning disable SA1116
+#pragma warning disable SA1117
+#pragma warning disable SA1512
+#pragma warning disable SA1623
+#pragma warning disable SA1642
+#pragma warning disable S3903
+#pragma warning disable S3996
+
+namespace System.Diagnostics.CodeAnalysis;
+
+/// <summary>
+/// /// Indicates that the specified method requires dynamic access to code that is not referenced
+/// statically, for example through <see cref="System.Reflection"/>.
+/// </summary>
+/// <remarks>
+/// This allows tools to understand which methods are unsafe to call when removing unreferenced
+/// code from an application.
+/// </remarks>
+[AttributeUsage(AttributeTargets.Method | AttributeTargets.Constructor | AttributeTargets.Class, Inherited = false)]
+[ExcludeFromCodeCoverage]
+internal sealed class RequiresUnreferencedCodeAttribute : Attribute
+{
+    /// <summary>
+    /// Initializes a new instance of the <see cref="RequiresUnreferencedCodeAttribute"/> class
+    /// with the specified message.
+    /// </summary>
+    /// <param name="message">
+    /// A message that contains information about the usage of unreferenced code.
+    /// </param>
+    public RequiresUnreferencedCodeAttribute(string message) => Message = message;
+
+    /// <summary>
+    /// Gets a message that contains information about the usage of unreferenced code.
+    /// </summary>
+    public string Message { get; }
+
+    /// <summary>
+    /// Gets or sets an optional URL that contains more information about the method,
+    /// why it requires unreferenced code, and what options a consumer has to deal with it.
+    /// </summary>
+    public string? Url { get; set; }
+}

src/Polly.Core/CircuitBreaker/AdvancedCircuitBreakerStrategyOptions.TResult.cs

@@ -48,6 +48,9 @@ public class AdvancedCircuitBreakerStrategyOptions<TResult> : CircuitBreakerStra
     /// <value>
     /// The default value is 30 seconds. Value must be greater than 0.5 seconds.
     /// </value>
+#pragma warning disable IL2026 // Addressed with DynamicDependency on ValidationHelper.Validate method
     [Range(typeof(TimeSpan), "00:00:00.500", "1.00:00:00")]
     public TimeSpan SamplingDuration { get; set; } = CircuitBreakerConstants.DefaultSamplingDuration;
+#pragma warning restore IL2026
+
 }

src/Polly.Core/CircuitBreaker/CircuitBreakerStrategyOptions.cs

@@ -29,8 +29,10 @@ public abstract class CircuitBreakerStrategyOptions<TResult> : ResilienceStrateg
     /// <value>
     /// The default value is 5 seconds. Value must be greater than 0.5 seconds.
     /// </value>
+#pragma warning disable IL2026 // Addressed with DynamicDependency on ValidationHelper.Validate method
     [Range(typeof(TimeSpan), "00:00:00.500", "1.00:00:00")]
     public TimeSpan BreakDuration { get; set; } = CircuitBreakerConstants.DefaultBreakDuration;
+#pragma warning restore
 
     /// <summary>
     /// Gets or sets the predicates for the circuit breaker.

src/Polly.Core/Polly.Core.csproj

@@ -10,6 +10,10 @@
     <MutationScore>100</MutationScore>
     <LegacySupport>true</LegacySupport>
     <InjectSharedSources>true</InjectSharedSources>
+    <IsTrimmable>true</IsTrimmable>
+    <EnableTrimAnalyzer>true</EnableTrimAnalyzer>
+    <EnableSingleFileAnalyzer>true</EnableSingleFileAnalyzer>
+    <EnableAotAnalyzer>true</EnableAotAnalyzer>
   </PropertyGroup>
 
   <ItemGroup>

src/Polly.Core/ResilienceStrategyBuilderBase.cs

@@ -1,7 +1,6 @@
 using System.ComponentModel;
 
 using System.ComponentModel.DataAnnotations;
-
 namespace Polly;
 
 /// <summary>
@@ -16,7 +15,9 @@ public abstract class ResilienceStrategyBuilderBase
 {
     private readonly List<Entry> _entries = new();
     private bool _used;
+#pragma warning disable IL2026 // Members annotated with 'RequiresUnreferencedCodeAttribute' require dynamic access otherwise can break functionality when trimming application code
     private Action<ResilienceValidationContext> _validator = ValidationHelper.ValidateObject;
+#pragma warning restore IL2026 // Members annotated with 'RequiresUnreferencedCodeAttribute' require dynamic access otherwise can break functionality when trimming application code
 
     private protected ResilienceStrategyBuilderBase()
     {