/*+
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).+
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* All rights reserved.+
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*+
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* This program is free software: you can redistribute it and/or modify+
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* it under the terms of the GNU Lesser General Public License as published by+
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* the Free Software Foundation, either version 3 of the License, or+
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* (at your option) any later version.+
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*+
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* This program is distributed in the hope that it will be useful,+
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* but WITHOUT ANY WARRANTY; without even the implied warranty of+
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the+
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* GNU Lesser General Public License for more details.+
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* +
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* You should have received a copy of the GNU Lesser General Public License+
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* along with this program.  If not, see <http://www.gnu.org/licenses/>.+
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*/+
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+
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#include <iostream>+
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#include "dwarfmanager.h"+
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#include "inputfile.h"+
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+
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const string DwarfAbbrevManager::iAbbrevSectionName(".debug_abbrev");+
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void InfoContext::SetAbbrevOffset(size_t offset){+
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	if (!iContextValid){+
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		cerr << "Error: runtime error - SetAbbrevOffset called on invalid InfoContext\n";+
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		exit(EXIT_FAILURE);+
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	}+
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	+
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	if (iAbbrevOffset == offset)+
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			return;+
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	// Save current entry (in particular the cursor value+
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	if (iAbbrevOffset != 0xffffffff){+
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		AbbrevOffsetMap::iterator old = iMap.find(iAbbrevOffset);+
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		if (old != iMap.end())+
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			old->second.iCursor = iAbbrevMapEntry.iCursor;+
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		else+
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			iMap[iAbbrevOffset] = iAbbrevMapEntry;+
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	}+
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	+
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	AbbrevOffsetMap::iterator i = iMap.find(offset);+
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	if (i != iMap.end()){+
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		iAbbrevMapEntry = i->second;+
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	} else {+
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		AbbrevMap * newMap = new AbbrevMap;+
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		new (&iAbbrevMapEntry) AbbrevMapEntry(iSectionStart + offset, newMap);+
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		iMap[offset] = iAbbrevMapEntry;+
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	}+
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	iAbbrevOffset = offset;+
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}+
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+
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DebugAbbrev & InfoContext::GetAbbrev(Dwarf_Word aCode){+
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	AbbrevMap::iterator i = iAbbrevMapEntry.iMap->find(aCode);+
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	if (i != iAbbrevMapEntry.iMap->end()){+
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			return i->second;+
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	} else {+
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		return FindAbbrev(aCode);+
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	}+
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}+
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+
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DebugAbbrev & InfoContext::FindAbbrev(Dwarf_Word aCode){+
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	// retrieve cursor for where we've scanned so far.+
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	Dwarf_Byte_Ptr p = iAbbrevMapEntry.iCursor;+
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	// NB. error if we don't find the code before section end+
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	Dwarf_Byte_Ptr lim = iSectionEnd;+
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	bool error = false;+
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	bool found = false;+
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	size_t leb128_length;+
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+
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	while (!found && (p < lim)){+
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		+
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#define CHECK_ABBREV_LIM(p,l,e) { if ((p)>(l)){ e = true; break;} }+
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#define CHECK_DECODE_ULEB128(v,p,n,l,e) \+
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			DECODE_ULEB128(v,p,n)\+
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			CHECK_ABBREV_LIM(p,l,e);+
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		+
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		size_t count = 0;+
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		//CHECK_DECODE_ULEB128(abbrev_code,p,leb128_length,lim, error);+
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		Dwarf_Word abbrev_code = DwarfSectionManager::DecodeUnsignedLeb128(p, leb128_length);+
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		p += leb128_length;+
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		if (p>lim){ +
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			error = true; +
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			break;+
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		}+
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		// Might as well error here since either we've found the NULL abbrev+
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	    if (abbrev_code == 0) {+
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	    	DebugAbbrev abbr(0, 0, 0, NULL, NULL);+
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	    	(*iAbbrevMapEntry.iMap)[0] = abbr;+
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	    	if (aCode == 0) // ??? why would it+
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	    		found = true;+
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	    }+
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+
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		CHECK_DECODE_ULEB128(tag,p,leb128_length,lim, error);+
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		// don't care about 'has child'+
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	    p++;+
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	    CHECK_ABBREV_LIM(p,lim,error);+
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	    Dwarf_Byte_Ptr raw_attr_ptr = p;+
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	    Dwarf_Word attr;+
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	    Dwarf_Word attr_form;+
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	    do {+
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	    	CHECK_DECODE_ULEB128(a,p,leb128_length,lim, error);+
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	    	attr = a;+
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	    	CHECK_DECODE_ULEB128(f,p,leb128_length,lim, error);+
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	    	attr_form = f;+
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+
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	    	if (attr != 0)+
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	    		count++;+
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+
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	    } while (attr != 0 || attr_form != 0);+
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	    +
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		DebugAbbrevAttrForm * list = new DebugAbbrevAttrForm[count];+
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		Dwarf_Byte_Ptr q=raw_attr_ptr;+
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		for (size_t i=0 ; i < count ; i++){+
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			list[i].iAttr = ULEB128(q,leb128_length);+
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			list[i].iForm = ULEB128(q,leb128_length);+
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		}+
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	    DebugAbbrev abbr(abbrev_code, tag, count, raw_attr_ptr, list);+
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	    (*iAbbrevMapEntry.iMap)[abbrev_code] = abbr;+
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	    if (abbrev_code == aCode)+
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	    	found = true;+
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	}+
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	if (error){+
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		cerr << "Error: corrupt .debug_abbrev section\n";+
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		exit(EXIT_FAILURE);+
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	}+
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	if (!found){+
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		cerr << "Error: abbrev code not found in .debug_abbrev section\n";+
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		exit(EXIT_FAILURE);+
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	}+
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	// record where we scanned to+
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	iAbbrevMapEntry.iCursor = p;+
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	// get the +
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	AbbrevMap::iterator i = iAbbrevMapEntry.iMap->find(aCode);+
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	if (i == iAbbrevMapEntry.iMap->end()){+
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		cerr << "Error: Runtime error processing .debug_abbrev section\n";+
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		exit(EXIT_FAILURE);+
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	} +
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+
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	return i->second;+
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}+
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+
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void DwarfAbbrevManager::StartContext(PathName & aName){+
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	Dwarf_Byte_Ptr section = GetSection(aName);+
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	iInfoContext.Init(section, section + GetSectionSize(aName), GetSectionOffset(aName));+
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}+
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+
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void DwarfAbbrevManager::EndContext(){+
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	iInfoContext.Reset();+
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}+
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+
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void DwarfAbbrevManager::SetContextAbbrevOffset(Uint32 offset){+
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	iInfoContext.SetAbbrevOffset(offset);+
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}+
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+
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size_t DwarfAbbrevManager::GetContextSectionOffset(){+
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	return iInfoContext.GetSectionOffset();+
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}+
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+
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DebugAbbrev & DwarfAbbrevManager::GetAbbrev(Dwarf_Word aCode){+
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	return iInfoContext.GetAbbrev(aCode);+
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}+
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