Imported Upstream version 6.4.0.137

Former-commit-id: 943baa9f16a098c33e129777827f3a9d20da00d6

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

@@ -0,0 +1,50 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Text;
+
+namespace System.Diagnostics
+{
+	partial class StackFrame
+	{
+		internal StackFrame (MonoStackFrame monoStackFrame, bool needFileInfo)
+		{
+			_method = monoStackFrame.methodBase;
+			_nativeOffset = monoStackFrame.nativeOffset;
+			_ilOffset = monoStackFrame.ilOffset;
+
+			if (needFileInfo) {
+				_fileName = monoStackFrame.fileName;
+				_lineNumber = monoStackFrame.lineNumber;
+				_columnNumber = monoStackFrame.columnNumber;
+			}
+
+			_isLastFrameFromForeignExceptionStackTrace = monoStackFrame.isLastFrameFromForeignException;
+		}
+
+		[MethodImplAttribute (MethodImplOptions.NoInlining)]
+		void BuildStackFrame (int skipFrames, bool needFileInfo)
+		{
+			const int SystemDiagnosticsStackDepth = 3;
+
+			if (skipFrames + SystemDiagnosticsStackDepth < 0 || !get_frame_info (skipFrames + SystemDiagnosticsStackDepth, needFileInfo, out var method, out var ilOffset, out var nativeOffset, out var fileName, out var line, out var column))
+				return;
+
+			_method = method;
+			_ilOffset = ilOffset;
+			_nativeOffset = nativeOffset;
+
+			if (needFileInfo) {
+				_fileName = fileName;
+				_lineNumber = line;
+				_columnNumber = column;
+			}
+		}
+
+		bool AppendStackFrameWithoutMethodBase (StringBuilder sb) => false;
+
+		[MethodImplAttribute (MethodImplOptions.InternalCall)]
+		static extern bool get_frame_info (int skipFrames, bool needFileInfo,
+			out MethodBase method, out int ilOffset, out int nativeOffset, out string file, out int line, out int column);
+
+	}
+}