Imported Upstream version 6.4.0.137

Former-commit-id: 943baa9f16a098c33e129777827f3a9d20da00d6

mcs/class/System.Private.CoreLib/System.Diagnostics/StackTrace.cs

@@ -0,0 +1,82 @@
+using System.Collections.Generic;
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+namespace System.Diagnostics
+{
+	// Need our own stackframe class since the shared version has its own fields
+	[StructLayout (LayoutKind.Sequential)]
+	class MonoStackFrame
+	{
+		#region Keep in sync with object-internals.h
+		internal int ilOffset;
+		internal int nativeOffset;
+		// Unused
+		internal long methodAddress;
+		// Unused
+		internal uint methodIndex;
+		internal MethodBase methodBase;
+		internal string fileName;
+		internal int lineNumber;
+		internal int columnNumber;
+		// Unused
+		internal string internalMethodName;
+		#endregion
+
+		internal bool isLastFrameFromForeignException;
+	}
+
+	partial class StackTrace
+	{
+		[MethodImplAttribute (MethodImplOptions.InternalCall)]
+		internal static extern MonoStackFrame[] get_trace (Exception e, int skipFrames, bool needFileInfo);
+
+		[MethodImplAttribute (MethodImplOptions.NoInlining)]
+		void InitializeForCurrentThread (int skipFrames, bool needFileInfo)
+		{
+			skipFrames += 2; // Current method + parent ctor
+
+			StackFrame sf;
+			var frames = new List<StackFrame> ();
+			while (skipFrames >= 0) {
+				sf = new StackFrame (skipFrames, needFileInfo);
+				if (sf.GetMethod () == null) {
+					break;
+				}
+				frames.Add (sf);
+				skipFrames++;
+			}
+
+			_stackFrames = frames.ToArray ();
+			_numOfFrames = _stackFrames.Length;
+		}
+		
+		void InitializeForException (Exception e, int skipFrames, bool needFileInfo)
+		{
+			var frames = get_trace (e, skipFrames, needFileInfo);
+			_numOfFrames = frames.Length;
+
+			int foreignFrames;
+			MonoStackFrame[] foreignExceptions = e.foreignExceptionsFrames;
+
+			if (foreignExceptions != null) {
+				foreignFrames = foreignExceptions.Length;
+				_numOfFrames += foreignFrames;
+
+				_stackFrames = new StackFrame [_numOfFrames];
+
+				for (int i = 0; i < foreignExceptions.Length; ++i) {
+					_stackFrames [i] = new StackFrame (foreignExceptions [i], needFileInfo);
+				}
+			} else {
+				_stackFrames = new StackFrame [_numOfFrames];
+				foreignFrames = 0;
+			}
+
+			for (int i = 0; i < frames.Length; ++i) {
+				_stackFrames [foreignFrames + i] = new StackFrame (frames [i], needFileInfo);
+			}
+		}
+	}
+}