/*

* 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:

* The class CCrashInfoCallStack is part of CrashAnalyser CrashInfoFile plugin.

* It is a temporary container for thread call stack.

* Call stack is stored in fully decoded form as lines of text

* 

*/

using System;

using System.Collections.Generic;

using System.Text;

using CrashItemLib.Crash.Stacks;

using CrashItemLib.Crash.Registers;

using CrashItemLib.Crash.Symbols;

using XmlFilePlugin.PluginImplementations.FileFormat;

namespace XmlFilePlugin.FileFormat

{

    class CXmlCallStack

    {

        #region Constructors

        public CXmlCallStack()

        {

        }

        #endregion

        public void Read(CIStack aStack)

        {

            foreach (CIStackEntry entry in aStack)

            {

                CCrashInfoCSItem csItem = new CCrashInfoCSItem();

                if (entry.IsCurrentStackPointerEntry)

                {

                    iStackPointerLocation = iCallStack.Count;

                    csItem.iIsStackPointer = true;

                }

                CIRegister register = entry.Register;

                if (register != null) //entry is from registers

                {

                    csItem.iIsRegisterEntry = true;

                    if (register.Name == "PC")

                    {

                        csItem.iRegisterName = "Program counter";

                    }

                    else if (register.Name == "LR")

                    {

                        csItem.iRegisterName = "Link register";

                    }

                    else //other register

                    {

                        csItem.iRegisterName = register.Name;

                    }

                }

                else //entry is from memory (normal case)

                {

                    csItem.iMemoryAddress = entry.Address;

                }

                //Add data contained in the memory location

                csItem.iItemData = entry.Data;

                csItem.iItemDataString = entry.DataAsString;

                if (entry.Symbol != null) //add symbol if possible

                {

                    csItem.iHasSymbol = true;

                    csItem.iSymbolName = entry.Symbol.Symbol.Name;

                    csItem.iSymbolOffset = entry.FunctionOffset;

                    csItem.iSymbolObject = entry.Symbol.Symbol.Object;

                }

                // else symbol is not available

                iCallStack.Add(csItem);

            }

        }

        public void CleanStack()

        {   

            //Clean elements far above stack pointer

            if (iStackPointerLocation != null)

            {

                int removeAmount = (int)iStackPointerLocation - XmlConsts.KMaxItemAboveSP;

                if (removeAmount > 0)

                {

                    iCallStack.RemoveRange(0, removeAmount);

                }

                //Clean symbolless items far below stack pointer

                for (int i = (int)iStackPointerLocation + XmlConsts.KNonSymbolItemsAfterSP; i < iCallStack.Count; )

                {

                    if (!iCallStack[i].iHasSymbol)

                    {                        

                        iCallStack.RemoveAt(i);

                    }

                    else

                    {

                        ++i;

                    }

                }

            }

        }

        public override string ToString()

        {

            MakeWritableStack();

            System.Text.StringBuilder output = new System.Text.StringBuilder();

            foreach (string line in iTextContent)

            {

                if (output.Length + line.Length + XmlConsts.Kxml_EOL.Length >= XmlConsts.KMaxStackSize)

                {

                    break;

                }

                output.AppendLine(line);

            }

            return output.ToString();

        }

        private void MakeWritableStack()

        {

            foreach (CCrashInfoCSItem csItem in iCallStack)

            {

                System.Text.StringBuilder line = new System.Text.StringBuilder();

                if (csItem.iIsStackPointer)

                {

                    line.Append("This is current stack pointer ");

                }

                if (csItem.iIsRegisterEntry) //entry is from registers

                {

                    line.Append(csItem.iRegisterName + " ");

                }

                else //entry is from memory (normal case)

                {

                    line.Append(csItem.iMemoryAddress.ToString("X").PadLeft(8, '0'));

                }

                line.Append(" " + csItem.iItemData.ToString("X").PadLeft(8, '0'));

               if (csItem.iHasSymbol) //symbol if available

               {

                   line.Append(" " + csItem.iSymbolName);

                   line.Append(" " + csItem.iSymbolOffset.ToString("X").PadLeft(4, '0'));

                   line.Append(" " + csItem.iSymbolObject);

               }

               else //symbol is not available, print content in ascii (may contain some readable text)

               {

                   line.Append(" " + csItem.iItemDataString);

               }               

               iTextContent.Add(line.ToString());

           }

        }

        #region Data Members

        private List<string> iTextContent = new List<string>();

        private List<CCrashInfoCSItem> iCallStack = new List<CCrashInfoCSItem>();

        private int? iStackPointerLocation = null;

        #endregion

        #region Nested Classes

        private class CCrashInfoCSItem

        {

            #region Constructors

            public CCrashInfoCSItem()

            {

            }

            #endregion

            #region Data Members

            public uint iMemoryAddress = 0;

            public uint iItemData = 0;

            public string iItemDataString = string.Empty;

            public bool iIsStackPointer = false;

            public bool iIsRegisterEntry = false;

            public string iRegisterName = string.Empty;

            public bool iHasSymbol = false;

            public string iSymbolName = string.Empty;

            public string iSymbolObject = string.Empty;

            public uint iSymbolOffset = 0;

            #endregion

        }

        #endregion

    }

}