//------------------------------------------------------------
// Copyright (c) Microsoft Corporation.  All rights reserved.
//------------------------------------------------------------

// This class needs to function even if it was built retail.  That is, a debug caller calling against a retail
// build of this assembly should still have asserts fire.  To achieve that, we need to define DEBUG here.
// We do not do the registry override in retail because that would require shipping a test hook.  We
// do not generally ship test hooks today.
#if DEBUG
#define DEBUG_FOR_REALS
#else
#define DEBUG
#endif

namespace System.Runtime
{
    using System;
    using System.Diagnostics;
    using System.Diagnostics.CodeAnalysis;
    using System.Runtime.CompilerServices;
    using System.Runtime.Interop;
    using System.Security;
    using System.Runtime.Versioning;


    static class AssertHelper
    {        
        [SuppressMessage(FxCop.Category.ReliabilityBasic, FxCop.Rule.InvariantAssertRule, Justification = "Assert implementation")]
        [ResourceConsumption(ResourceScope.Process)]
        internal static void FireAssert(string message)
        {
            try
            {
#if DEBUG_FOR_REALS
                InternalFireAssert(ref message);
#endif
            }
            finally
            {
                Debug.Assert(false, message);
            }
        }

#if DEBUG_FOR_REALS
        [SuppressMessage(FxCop.Category.Globalization, FxCop.Rule.DoNotPassLiteralsAsLocalizedParameters, Justification = "Debug Only")]
        [Fx.Tag.SecurityNote(Critical = "Calls into various critical methods",
            Safe = "Exists only on debug versions")]
        [SecuritySafeCritical]       
        static void InternalFireAssert(ref string message)
        {
            try
            {
                string debugMessage = "Assert fired! --> " + message + "\r\n";
                if (Debugger.IsAttached)
                {
                    Debugger.Log(0, Debugger.DefaultCategory, debugMessage);
                    Debugger.Break();
                }
                if (UnsafeNativeMethods.IsDebuggerPresent())
                {
                    UnsafeNativeMethods.OutputDebugString(debugMessage);
                    UnsafeNativeMethods.DebugBreak();
                }

                if (Fx.AssertsFailFast)
                {
                    try
                    {
                        Fx.Exception.TraceFailFast(message);
                    }
                    finally
                    {
                        Environment.FailFast(message);
                    }
                }
            }
            catch (Exception exception)
            {
                if (Fx.IsFatal(exception))
                {
                    throw;
                }

                string newMessage = "Exception during FireAssert!";
                try
                {
                    newMessage = string.Concat(newMessage, " [", exception.GetType().Name, ": ", exception.Message, "] --> ", message);
                }
                finally
                {
                    message = newMessage;
                }
                throw;
            }
        }
#endif
    }
}