Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / Diagnostics / assertwrapper.cs / 1 / assertwrapper.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== using System; using System.Diagnostics; using System.Runtime.InteropServices; using Microsoft.Win32; using System.Security.Permissions; using System.Security; using System.Collections; using System.Globalization; using System.Runtime.Versioning; namespace System.Diagnostics { internal static class AssertWrapper { #if DEBUG && !FEATURE_PAL static BooleanSwitch DisableVsAssert = new BooleanSwitch("DisableVsAssert", "Switch to disable usage of VSASSERT for DefaultTraceListener."); static bool vsassertPresent = true; static Hashtable ignoredAsserts = new Hashtable(StringComparer.OrdinalIgnoreCase); [ResourceExposure(ResourceScope.None)] private static void ShowVsAssert(string stackTrace, StackFrame frame, string message, string detailMessage) { int[] disable = new int[1]; try { string detailMessage2; if (detailMessage == null) detailMessage2 = stackTrace; else detailMessage2 = detailMessage + "\r\n" + stackTrace; string fileName = (frame == null) ? string.Empty : frame.GetFileName(); if (fileName == null) { fileName = string.Empty; } int lineNumber = (frame == null) ? 0 : frame.GetFileLineNumber(); int returnCode = VsAssert(detailMessage2, message, fileName, lineNumber, disable); if (returnCode != 0) { if (!System.Diagnostics.Debugger.IsAttached) { System.Diagnostics.Debugger.Launch(); } System.Diagnostics.Debugger.Break(); } if (disable[0] != 0) ignoredAsserts[MakeAssertKey(fileName, lineNumber)] = null; } catch (Exception) { vsassertPresent = false; } } [DllImport(ExternDll.Vsassert, CharSet=System.Runtime.InteropServices.CharSet.Ansi, BestFitMapping=true)] [ResourceExposure(ResourceScope.None)] public static extern int VsAssert(string message, string assert, string file, int line, [In, Out]int[] pfDisable); [ResourceExposure(ResourceScope.None)] public static void ShowAssert(string stackTrace, StackFrame frame, string message, string detailMessage) { bool userInteractive = Environment.UserInteractive; string fileName = (frame == null) ? string.Empty : frame.GetFileName(); if (fileName == null) { fileName = string.Empty; } int lineNumber = (frame == null) ? 0 : frame.GetFileLineNumber(); if (ignoredAsserts.ContainsKey(MakeAssertKey(fileName, lineNumber))) return; if (vsassertPresent && !DisableVsAssert.Enabled && userInteractive) ShowVsAssert(stackTrace, frame, message, detailMessage); // the following is not in an 'else' because vsassertPresent might // have gone from true to false. if (!vsassertPresent || DisableVsAssert.Enabled || !userInteractive) ShowMessageBoxAssert(stackTrace, message, detailMessage); } private static string MakeAssertKey(string fileName, int lineNumber) { return fileName + ":" + lineNumber.ToString(CultureInfo.InvariantCulture); } #else // DEBUG && !FEATURE_PAL public static void ShowAssert(string stackTrace, StackFrame frame, string message, string detailMessage) { ShowMessageBoxAssert(stackTrace, message, detailMessage); } #endif // DEBUG && !FEATURE_PAL [ResourceExposure(ResourceScope.None)] private static void ShowMessageBoxAssert(string stackTrace, string message, string detailMessage) { string fullMessage = message + "\r\n" + detailMessage + "\r\n" + stackTrace; #if !FEATURE_PAL fullMessage = TruncateMessageToFitScreen(fullMessage); #endif // !FEATURE_PAL int flags = 0x00000002 /*AbortRetryIgnore*/ | 0x00000200 /*DefaultButton3*/ | 0x00000010 /*IconHand*/ | 0x00040000 /* TopMost */; if (!Environment.UserInteractive) flags = flags | 0x00200000 /*ServiceNotification */; if (IsRTLResources) flags = flags | SafeNativeMethods.MB_RIGHT | SafeNativeMethods.MB_RTLREADING; int rval = SafeNativeMethods.MessageBox(NativeMethods.NullHandleRef, fullMessage, SR.GetString(SR.DebugAssertTitle), flags); switch (rval) { case 3: // abort new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert(); try { Environment.Exit(1); } finally { CodeAccessPermission.RevertAssert(); } break; case 4: // retry if (!System.Diagnostics.Debugger.IsAttached) { System.Diagnostics.Debugger.Launch(); } System.Diagnostics.Debugger.Break(); break; } } private static bool IsRTLResources { get { return SR.GetString(SR.RTL) != "RTL_False"; } } #if !FEATURE_PAL // Since MessageBox will grow taller than the screen if there are too many lines do // a rough calculation to make it fit. [ResourceExposure(ResourceScope.None)] private static string TruncateMessageToFitScreen(string message) { const int MaxCharsPerLine = 80; IntPtr hFont = SafeNativeMethods.GetStockObject(NativeMethods.DEFAULT_GUI_FONT); IntPtr hdc = UnsafeNativeMethods.GetDC(NativeMethods.NullHandleRef); NativeMethods.TEXTMETRIC tm = new NativeMethods.TEXTMETRIC(); hFont = UnsafeNativeMethods.SelectObject(new HandleRef(null, hdc), new HandleRef(null, hFont)); SafeNativeMethods.GetTextMetrics(new HandleRef(null, hdc), tm); UnsafeNativeMethods.SelectObject(new HandleRef(null, hdc), new HandleRef(null, hFont)); UnsafeNativeMethods.ReleaseDC(NativeMethods.NullHandleRef, new HandleRef(null, hdc)); hdc = IntPtr.Zero; int cy = UnsafeNativeMethods.GetSystemMetrics(NativeMethods.SM_CYSCREEN); int maxLines = cy / tm.tmHeight - 15; int lineCount = 0; int lineCharCount = 0; int i = 0; while (lineCount < maxLines && i < message.Length - 1) { char ch = message[i]; lineCharCount++; if (ch == '\n' || ch == '\r' || lineCharCount > MaxCharsPerLine) { lineCount++; lineCharCount = 0; } // treat \r\n or \n\r as a single line break if (ch == '\r' && message[i + 1] == '\n') i+=2; else if (ch == '\n' && message[i + 1] == '\r') i+=2; else i++; } if (i < message.Length - 1) message = SR.GetString(SR.DebugMessageTruncated, message.Substring(0, i)); return message; } #endif // !FEATURE_PAL } }
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