// 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.

namespace System.Diagnostics
{
    // Attribute class used by the compiler to mark modules.
    // If present, then debugging information for everything in the
    // assembly was generated by the compiler, and will be preserved
    // by the Runtime so that the debugger can provide full functionality
    // in the case of JIT attach. If not present, then the compiler may
    // or may not have included debugging information, and the Runtime
    // won't preserve the debugging info, which will make debugging after
    // a JIT attach difficult.
    [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Module, AllowMultiple = false)]
    public sealed class DebuggableAttribute : Attribute
    {
        [Flags]
        public enum DebuggingModes
        {
            None = 0x0,
            Default = 0x1,
            DisableOptimizations = 0x100,
            IgnoreSymbolStoreSequencePoints = 0x2,
            EnableEditAndContinue = 0x4
        }

        public DebuggableAttribute(bool isJITTrackingEnabled, bool isJITOptimizerDisabled)
        {
            DebuggingFlags = 0;

            if (isJITTrackingEnabled)
            {
                DebuggingFlags |= DebuggingModes.Default;
            }

            if (isJITOptimizerDisabled)
            {
                DebuggingFlags |= DebuggingModes.DisableOptimizations;
            }
        }

        public DebuggableAttribute(DebuggingModes modes)
        {
            DebuggingFlags = modes;
        }

        public bool IsJITTrackingEnabled => (DebuggingFlags & DebuggingModes.Default) != 0;

        public bool IsJITOptimizerDisabled => (DebuggingFlags & DebuggingModes.DisableOptimizations) != 0;

        public DebuggingModes DebuggingFlags { get; }
    }
}