--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crashanalysercmd/PerfToolsSharedLibraries/Engine/SymbianETMLib/Common/BranchDecoder/ETMBranchDecoderAlternative.cs	Thu Feb 11 15:50:58 2010 +0200
@@ -0,0 +1,165 @@
+/*
+* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description: 
+*
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using SymbianUtils.BasicTypes;
+using SymbianStructuresLib.Arm;
+using SymbianStructuresLib.Arm.Exceptions;
+using SymbianETMLib.Common.Types;
+using SymbianETMLib.Common.Config;
+using SymbianETMLib.Common.State;
+
+namespace SymbianETMLib.Common.BranchDecoder
+{
+    internal class ETMBranchDecoderAlternative : ETMBranchDecoderOriginal
+    {
+        #region Constructors
+        public ETMBranchDecoderAlternative( ETMStateData aManager )
+            : base( aManager )
+        {
+        }
+        #endregion
+
+        #region From ETBBranchDecoder
+        protected override void DecodePartial()
+        {
+            int count = base.Count;
+            System.Diagnostics.Debug.Assert( count > 0 && count < 5 );
+
+            // According to Table 7-13, "Missing components of exception Branch address packets"
+            // then after a partial branch, we're always in "no exception" state
+            base.ExceptionType = TArmExceptionType.ENone;
+
+            if ( count == 1 )
+            {
+                // The single-byte packet is exactly the same as in the original encoding
+                base.DecodePartial();
+            }
+            else
+            {
+                // We have full 5 bytes of address info.
+                SymMask maskFirst = new SymMask( 0x7E, SymMask.TShiftDirection.ERight, 1 );
+                SymMask maskMiddle = new SymMask( 0x7F );
+                SymMask maskLast = new SymMask( 0x3F );
+
+                SymByte b;
+                SymAddressWithKnownBits address = new SymAddressWithKnownBits();
+                uint masked = 0;
+
+                // First byte
+                b = base[ 0 ];
+                address.KnownBits += 6;
+                address.Address |= maskFirst.Apply( b );
+
+                // Middle bytes, but not the last
+                for ( int i = 1; i < count-1; i++ )
+                {
+                    b = base[ i ];
+                    b = (byte) maskMiddle.Apply( b );
+                    masked = (uint) ( b << address.KnownBits );
+                    address.KnownBits += 7;
+                    address.Address |= masked;
+                }
+
+                // Last byte
+                b = base.LastByte;
+                address.KnownBits += 6;
+                address.Address |= maskLast.Apply( b );
+
+                // Shift entire address by shift count based upon current instruction set.
+                int isShift = ETMBranchDecoder.CompressionLeftShiftCount( base.InstructionSet );
+                address.KnownBits += isShift;
+                address.Address <<= isShift;
+
+                // Save address
+                base.BranchAddress = address;
+            }
+        }
+
+        public override bool IsPacketComplete
+        {
+            get
+            {
+                bool ret = false;
+                //
+                SymByte lastByte = base.LastByte;
+                bool bit7 = lastByte[ 7 ];
+                //
+                if ( bit7 )
+                {
+                    // If the 7th bit is set, then the interpretation is the same as in the original
+                    // compression scheme, in which case we can use the base class call.
+                    ret = base.IsPacketComplete;
+                }
+                else
+                {
+                    if ( base.Count == 1 )
+                    {
+                        // If the 7th bit is clear and this is the first byte, then this is also
+                        // the only byte - no exception continuation byte follows.
+                        ret = true;
+                    }
+                    else
+                    {
+                        // If the 7th bit is clear and the 6th bit is also clear, then this is
+                        // the last byte.
+                        bool bit6 = lastByte[ 6 ];
+                        ret = ( bit6 == false );
+                    }
+                }
+                //
+                return ret;
+            }
+        }
+
+        public override bool IsBranchAddressAvailable
+        {
+            get
+            {
+                bool ret = base.IsBranchAddressAvailable;
+                return ret;
+            }
+        }
+        #endregion
+
+        #region From ETBBranchDecoderOriginal
+        /*
+        protected override bool ContainsInlineException
+        {
+            get
+            {
+                // Not supported in alternative encoding
+                return false;
+            }
+        }*/
+        #endregion
+
+        #region Properties
+        #endregion
+
+        #region Internal constants
+        #endregion
+
+        #region Internal methods
+        #endregion
+
+        #region Data members
+        #endregion
+    }
+}