/*

* Copyright (c) 2001-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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: 

*

*/

#if !defined(__ELFDLL_H__)

#define __ELFDLL_H__

//#include <e32rom.h>

#include "e32ldfmt.h"

#include <elfdefs.h>

#include "elffile.h"

#define DLLSYMPREFIX "#<DLL>"

#define DLLSYMPREFIX0 "#"

#define DLLSYMSUFFIX "#<\\DLL>"

#define ORDBASE 16

#define EXPORTTABLENAME "DLL##ExportTable"

#define EXPORTTABLESIZENAME "DLL##ExportTableSize"

class NamedExportSymbol;

class OrdZeroRecord;

struct NeededDLLsList;

const TUint		KNameLookupOffsetFlag32 = 0x0001;

class ELFFile::ELFDllData

        {

public:

	ELFFile * iElfFile;

	char * iDynStrTab;

	// bytesize of the dynamic string table

	TInt iDynStrTabSize; 

	Elf32_Sym * iDynSymTab;

	// size of an entry in the dynamic symbol table

	TInt iSymSize;

	// the rela relocation table

	Elf32_Rela * iRela;

	// size of rela relocation table in bytes

	TInt iRelaSz;

	// size of a rela entry in bytes

	TInt iRelaEnt;

	// the rel relocation table

	Elf32_Rel * iRel;

	// size of rel relocation table in bytes

	TInt iRelSz;

	// size of a rel entry in bytes

	TInt iRelEnt;

	Elf32_HashTable * iHashTable;

	// Exported symbols required for lookup via names.

	NamedExportSymbol			*iNamedExportSymbolHead;

	// Number of exported symbols - this doesn't nclude the absent symbols.

	TInt					iNamedExportCount;

	// header of the export symbol info table

	E32EpocExpSymInfoHdr	iSymInfoHdr;

	// String table size for the symbol names.

	TUint					iSymStringTableSize;

	TUint					iStringNameOffset;

	// Dependency list

	// Static Dependencies - An 'import relocation' entry is required to be created 

	// for each such record.

	OrdZeroRecord		*iDepRecords;

	OrdZeroRecord		*iDepRecordsTail;

	// List of names obtained from DT_NEEDED entries in ELF.

	// The order in which they appear is the order in which symbol

	// lookup shall be followed.

	NeededDLLsList		*iNeededDllNames;

	NeededDLLsList		*iNeededDllNamesTail;

	// Ordinal 0 of this binary. - A local relocation needs to be created for this

	// record.

	OrdZeroRecord		*iOrdZeroRec;		

	TInt			iNamedLookupEnabled;

	ELFDllData(ELFFile * f);

	~ELFDllData();

    TBool Init();

	TBool ParseDllSymbol(Elf32_Sym * s, char*& dll, TUint& len, TInt& ord);

	class DllSymbol

		{

	public:

		char * iDll;

		TUint iLen;

		TInt iOrd;

		Elf32_Phdr * iSegment;

		Elf32_Rel * iRel;

		DllSymbol * iNext;

		DllSymbol(char * n, TUint l, TInt o) 

		        : iDll(n), iLen(l), iOrd(o), iSegment(0),iRel(0),iNext(0) 

			{}

		~DllSymbol()

			{ 

			delete iNext; 

			}

		};

	DllSymbol * DllSymbolP(Elf32_Sym * s);

	TBool AddSymbol(DllSymbol * s);

	class DllRec

		{

	public:

	    char * iName;

	    TUint iLen;

	    TInt nImports;

	    DllSymbol * iHead;

	    DllSymbol * iTail;

	    DllRec * iNext;

		DllRec(char * n, TInt l, DllSymbol * s) :

			iName(n), iLen(l), nImports(1), iHead(s), iTail(s), iNext(0)

		    {}

	    ~DllRec() 

		    { 

		    delete iHead; 

		    delete iNext; 

		    }

	    void AddSymbol(DllSymbol * s);

	    };

	DllRec * iDllHead;

	DllRec * iDllTail;

	Elf32_Word iExportTableSymIdx;

	Elf32_Word iExportTableSizeSymIdx;

	TBool InitExportInfo();

	TBool iImageIsDll;

	TBool ImageIsDll() { return iImageIsDll; }

	Elf32_Word FindSymbolIndex(TText * s);

	TInt iNumberOfImports;

	TInt iNumberOfExports;

	TInt iNumberOfImportDlls;

	TInt iStringTableSize;

	TInt iNumberOfRelocs;

	TInt iNumberOfCodeRelocs;

	TInt iNumberOfDataRelocs;

	TInt NumberOfImports(void);

	TInt NumberOfExports(void);

	TInt NumberOfImportDlls(void);

	TInt NumberOfRelocs(void);

	TInt NumberOfCodeRelocs() { return iNumberOfCodeRelocs; }

	TInt NumberOfDataRelocs() { return iNumberOfDataRelocs; }

	TBool GetRelocs(Elf32_Rel **aCodeRelocs, Elf32_Rel **aDataRelocs);

	TUint GetExportTableOffset(void);

	char * CreateImportSection(TInt &aSize);

	TBool CreateSymLookupTable();

	TBool SetupSymbolValues();

	TBool SetupSymbolNames();

	void Sort(NamedExportSymbol** aDstList, NamedExportSymbol* aSrcList);

	void MergeSort(NamedExportSymbol** aDstList, NamedExportSymbol** aSrcList);

	void MergeSort(NamedExportSymbol** aDstList, NamedExportSymbol** aSrcList, \

									TUint aLeft, TUint aRight);

	TBool AddToDependency(TUint aOff);

	TBool CreateDependency();

	OrdZeroRecord* FindDependency(char* aName, TUint aLen);

	DllRec * SearchImports(char *aName);

	TInt GetLookupTblSize(){ return iSymInfoHdr.iSize;}

	void SetLookupTblBase(TInt);

	void GetExportSymInfoHeader(E32EpocExpSymInfoHdr& aSymInfoHdr);

	void SetExportSymInfo();

	TUint GetSymLookupSection(char* aBuff);

	};

// This class is used to create symbols to support named lookups.

// 

	class NamedExportSymbol

	{

	public:

		NamedExportSymbol(char* aName, Elf32_Addr aValue);

		~NamedExportSymbol()

		{

			delete iNext;

		}

		char* Name() { return iSymbolName;}

		void Name(char* aName) {iSymbolName = aName;}

		TUint NameOffset() {return iSymbolNameOffset;}

		void  NameOffset(TUint aOffset) {iSymbolNameOffset = aOffset;}

		Elf32_Addr Value() { return iValue;}

		void Value(Elf32_Addr aValue) { iValue = aValue;}

		NamedExportSymbol* Next() { return iNext;}

		void Next(NamedExportSymbol* aNext) { iNext = aNext;}

		Elf32_Rel	iReloc;	// relocation entry for the symbol address

		TUint		iSymRelocType;  // Whether it is a code or data relocation for this symbol

	private:

		char*		iSymbolName;	// Symbol name

		TInt		iSymIdx;

		TUint		iSymbolNameOffset;// offset of name in string table.

		Elf32_Addr	iValue;			// symbol value - this is the address of the symbol

		NamedExportSymbol *iNext;		// next symbol

	};

// This class is used to support symbol lookup of the static dependencies by linking in their 

// 0th ordinal.

	class OrdZeroRecord

	{

	public:

		OrdZeroRecord(char* aName): 

			iName(aName), iNext(0){}

		~OrdZeroRecord()

		{

			delete iNext;

		}

		char				*iName; // (linkas) name of the dependency

		Elf32_Rel			iReloc;	// a relocation entry for the 0th ordinal of each dependency

		OrdZeroRecord		*iNext; // next dependency

		TUint				iOffset;

	};

	struct NeededDLLsList

	{

		NeededDLLsList(TUint aOff) : iOffset(aOff), iNext(0)

		{}

		~NeededDLLsList()

		{

			delete iNext;

		}

		TUint iOffset;

		NeededDLLsList *iNext;

	};

#endif