Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Diagnostics / Stackframe.cs / 1 / Stackframe.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== namespace System.Diagnostics { using System.Text; using System; using System.IO; using System.Reflection; using System.Security.Permissions; // There is no good reason for the methods of this class to be virtual. // In order to ensure trusted code can trust the data it gets from a // StackTrace, we use an InheritanceDemand to prevent partially-trusted // subclasses. [SecurityPermission(SecurityAction.InheritanceDemand, UnmanagedCode=true)] [Serializable()] [System.Runtime.InteropServices.ComVisible(true)] public class StackFrame { private MethodBase method; private int offset; private int ILOffset; private String strFileName; private int iLineNumber; private int iColumnNumber; internal void InitMembers() { method = null; offset = OFFSET_UNKNOWN; ILOffset = OFFSET_UNKNOWN; strFileName = null; iLineNumber = 0; iColumnNumber = 0; } // Constructs a StackFrame corresponding to the active stack frame. public StackFrame() { InitMembers(); BuildStackFrame (0 + StackTrace.METHODS_TO_SKIP, false);// iSkipFrames=0 } // Constructs a StackFrame corresponding to the active stack frame. public StackFrame(bool fNeedFileInfo) { InitMembers(); BuildStackFrame (0 + StackTrace.METHODS_TO_SKIP, fNeedFileInfo);// iSkipFrames=0 } // Constructs a StackFrame corresponding to a calling stack frame. // public StackFrame(int skipFrames) { InitMembers(); BuildStackFrame (skipFrames + StackTrace.METHODS_TO_SKIP, false); } // Constructs a StackFrame corresponding to a calling stack frame. // public StackFrame(int skipFrames, bool fNeedFileInfo) { InitMembers(); BuildStackFrame (skipFrames + StackTrace.METHODS_TO_SKIP, fNeedFileInfo); } // Called from the class "StackTrace" // internal StackFrame(bool DummyFlag1, bool DummyFlag2) { InitMembers(); } // Constructs a "fake" stack frame, just containing the given file // name and line number. Use when you don't want to use the // debugger's line mapping logic. // public StackFrame(String fileName, int lineNumber) { InitMembers(); BuildStackFrame (StackTrace.METHODS_TO_SKIP, false); strFileName = fileName; iLineNumber = lineNumber; iColumnNumber = 0; } // Constructs a "fake" stack frame, just containing the given file // name, line number and column number. Use when you don't want to // use the debugger's line mapping logic. // public StackFrame(String fileName, int lineNumber, int colNumber) { InitMembers(); BuildStackFrame (StackTrace.METHODS_TO_SKIP, false); strFileName = fileName; iLineNumber = lineNumber; iColumnNumber = colNumber; } // Constant returned when the native or IL offset is unknown public const int OFFSET_UNKNOWN = -1; internal virtual void SetMethodBase (MethodBase mb) { method = mb; } internal virtual void SetOffset (int iOffset) { offset = iOffset; } internal virtual void SetILOffset (int iOffset) { ILOffset = iOffset; } internal virtual void SetFileName (String strFName) { strFileName = strFName; } internal virtual void SetLineNumber (int iLine) { iLineNumber = iLine; } internal virtual void SetColumnNumber (int iCol) { iColumnNumber = iCol; } // Returns the method the frame is executing // public virtual MethodBase GetMethod () { return method; } // Returns the offset from the start of the native (jitted) code for the // method being executed // public virtual int GetNativeOffset () { return offset; } // Returns the offset from the start of the IL code for the // method being executed. This offset may be approximate depending // on whether the jitter is generating debuggable code or not. // public virtual int GetILOffset() { return ILOffset; } // Returns the file name containing the code being executed. This // information is normally extracted from the debugging symbols // for the executable. // public virtual String GetFileName() { if (strFileName != null) { // This isn't really correct, but we don't have // a permission that protects discovery of potentially // local urls so we'll use this. FileIOPermission perm = new FileIOPermission( PermissionState.None ); perm.AllFiles = FileIOPermissionAccess.PathDiscovery; perm.Demand(); } return strFileName; } // Returns the line number in the file containing the code being executed. // This information is normally extracted from the debugging symbols // for the executable. // public virtual int GetFileLineNumber() { return iLineNumber; } // Returns the column number in the line containing the code being executed. // This information is normally extracted from the debugging symbols // for the executable. // public virtual int GetFileColumnNumber() { return iColumnNumber; } // Builds a readable representation of the stack frame // public override String ToString() { StringBuilder sb = new StringBuilder(255); if (method != null) { sb.Append(method.Name); // deal with the generic portion of the method if (method is MethodInfo && ((MethodInfo)method).IsGenericMethod) { Type[] typars = ((MethodInfo)method).GetGenericArguments(); sb.Append ("<"); int k=0; bool fFirstTyParam = true; while (k < typars.Length) { if (fFirstTyParam == false) sb.Append (","); else fFirstTyParam = false; sb.Append (typars[k].Name); k++; } sb.Append (">"); } sb.Append(" at offset "); if (offset == OFFSET_UNKNOWN) sb.Append(""); else sb.Append(offset); sb.Append(" in file:line:column "); bool useFileName = (strFileName != null); if (useFileName) { try { // This isn't really correct, but we don't have // a permission that protects discovery of potentially // local urls so we'll use this. FileIOPermission perm = new FileIOPermission( PermissionState.None ); perm.AllFiles = FileIOPermissionAccess.PathDiscovery; perm.Demand(); } catch (System.Security.SecurityException) { useFileName = false; } } if (!useFileName) sb.Append(" "); else sb.Append(strFileName); sb.Append(":"); sb.Append(iLineNumber); sb.Append(":"); sb.Append(iColumnNumber); } else { sb.Append(" "); } sb.Append(Environment.NewLine); return sb.ToString(); } private void BuildStackFrame(int skipFrames, bool fNeedFileInfo) { StackFrameHelper StackF = new StackFrameHelper(fNeedFileInfo, null); StackTrace.GetStackFramesInternal (StackF, 0, null); int iNumOfFrames = StackF.GetNumberOfFrames(); skipFrames += StackTrace.CalculateFramesToSkip (StackF, iNumOfFrames); if ((iNumOfFrames - skipFrames) > 0) { method = StackF.GetMethodBase (skipFrames); offset = StackF.GetOffset (skipFrames); ILOffset = StackF.GetILOffset (skipFrames); if (fNeedFileInfo) { strFileName = StackF.GetFilename (skipFrames); iLineNumber = StackF.GetLineNumber (skipFrames); iColumnNumber = StackF.GetColumnNumber (skipFrames); } } } } }
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