Function.GetSegmentForOffet is a bit more forgiving

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@674 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/Misc/Debugger/Debugger.Core/Project/Src/Threads/Function.cs

@@ -47,7 +47,7 @@ namespace DebuggerLibrary
 		
 		public bool HasSymbols {
 			get {
-				return symMethod != null;
+				return GetSegmentForOffet(0) != null;
 			}
 		}
 
@@ -218,13 +218,13 @@ namespace DebuggerLibrary
 		SourcecodeSegment GetSegmentForOffet(uint offset)
 		{
 			ISymbolMethod symMethod;
-				
-			symMethod = this.symMethod; 
+			
+			symMethod = this.symMethod;
 			if (symMethod == null) {
 				return null;
 			}
-
-            int sequencePointCount = symMethod.SequencePointCount;
+			
+			int sequencePointCount = symMethod.SequencePointCount;
 			
 			int[] offsets     = new int[sequencePointCount];
 			int[] startLine   = new int[sequencePointCount];
@@ -242,27 +242,27 @@ namespace DebuggerLibrary
 				endLine,
 				endColumn
 				);
-
+			
 			SourcecodeSegment retVal = new SourcecodeSegment();
-
-			// Get i for which: offsets[i] <= corInstructionPtr < offsets[i + 1]
+			
+			// Get i for which: offsets[i] <= offset < offsets[i + 1]
+			// or fallback to first element if  offset < offsets[0]
 			for (int i = sequencePointCount - 1; i >= 0; i--) // backwards
-				if (offsets[i] <= offset)
-				{
+				if (offsets[i] <= offset || i == 0) {
 					// Set inforamtion about current IL range
 					ICorDebugCode code;
 					corFunction.GetILCode(out code);
 					uint codeSize;
 					code.GetSize(out codeSize);
-
+					
 					retVal.ILOffset = (int)offset;
 					retVal.ILStart = offsets[i];
 					retVal.ILEnd = (i + 1 < sequencePointCount) ? offsets[i + 1] : (int)codeSize;
-
+					
 					// 0xFeeFee means "code generated by compiler"
 					// If we are in generated sequence use to closest real one instead,
 					// extend the ILStart and ILEnd to include the 'real' sequence
-
+					
 					// Look ahead for 'real' sequence
 					while (i + 1 < sequencePointCount && startLine[i] == 0xFeeFee) {
 						i++;
@@ -277,17 +277,17 @@ namespace DebuggerLibrary
 					if (startLine[i] == 0xFeeFee) {
 						return null;
 					}
-
+					
 					retVal.ModuleFilename = module.FullPath;
-
+					
 					retVal.SourceFullFilename = Doc[i].URL;
-
+					
 					retVal.StartLine = startLine[i];
 					retVal.StartColumn = startColumn[i];
 					retVal.EndLine = endLine[i];
 					retVal.EndColumn = endColumn[i];
-
-
+					
+					
 					List<int> stepRanges = new List<int>();
 					for (int j = 0; j < sequencePointCount; j++) {
 						// Step over compiler generated sequences and current statement
@@ -307,9 +307,9 @@ namespace DebuggerLibrary
 							}
 						}
 					}
-
+					
 					retVal.StepRanges = stepRanges.ToArray();
-
+					
 					return retVal;
 				}			
 			return null;