public void CreateDwarf()
{
// Create ELF object
var elf = new ElfObjectFile(ElfArch.X86_64);
var codeSection = new ElfBinarySection(new MemoryStream(new byte[0x64])).ConfigureAs(ElfSectionSpecialType.Text);
elf.AddSection(codeSection);
var stringSection = new ElfStringTable();
elf.AddSection(stringSection);
elf.AddSection(new ElfSymbolTable()
{
Link = stringSection
});
elf.AddSection(new ElfSectionHeaderStringTable());
var elfDiagnostics = new DiagnosticBag();
elf.UpdateLayout(elfDiagnostics);
Assert.False(elfDiagnostics.HasErrors);
// Create DWARF Object
var dwarfFile = new DwarfFile();
// Create .debug_line information
var fileName = new DwarfFileName()
{
Name = "check1.cpp",
Directory = Environment.CurrentDirectory,
};
var fileName2 = new DwarfFileName()
{
Name = "check2.cpp",
Directory = Environment.CurrentDirectory,
};
// First line table
for (int i = 0; i < 2; i++)
{
var lineTable = new DwarfLineProgramTable();
dwarfFile.LineSection.AddLineProgramTable(lineTable);
lineTable.AddressSize = DwarfAddressSize.Bit64;
lineTable.FileNames.Add(fileName);
lineTable.FileNames.Add(fileName2);
lineTable.AddLineSequence(new DwarfLineSequence()
{
new DwarfLine()
{
File = fileName,
Address = 0,
Column = 1,
Line = 1,
},
new DwarfLine()
{
File = fileName,
Address = 1,
Column = 1,
Line = 2,
}
}
);
// NOTE: doesn't seem to be generated by regular GCC
// (it seems that only one line sequence is usually used)
lineTable.AddLineSequence(new DwarfLineSequence()
{
new DwarfLine()
{
File = fileName2,
Address = 0,
Column = 1,
Line = 1,
},
}
);
}
// Create .debug_info
var rootDIE = new DwarfDIECompileUnit()
{
Name = fileName.Name,
LowPC = 0, // 0 relative to base virtual address
HighPC = (int)codeSection.Size, // default is offset/length after LowPC
CompDir = fileName.Directory,
StmtList = dwarfFile.LineSection.LineTables[0],
};
var subProgram = new DwarfDIESubprogram()
{
Name = "MyFunction",
};
rootDIE.AddChild(subProgram);
var cu = new DwarfCompilationUnit()
{
AddressSize = DwarfAddressSize.Bit64,
Root = rootDIE
};
dwarfFile.InfoSection.AddUnit(cu);
// AddressRange table
dwarfFile.AddressRangeTable.AddressSize = DwarfAddressSize.Bit64;
dwarfFile.AddressRangeTable.Unit = cu;
dwarfFile.AddressRangeTable.Ranges.Add(new DwarfAddressRange(0, 0, codeSection.Size));
// Transfer DWARF To ELF
var dwarfElfContext = new DwarfElfContext(elf);
dwarfFile.WriteToElf(dwarfElfContext);
var outputFileName = "create_dwarf.o";
using (var output = new FileStream(outputFileName, FileMode.Create))
{
elf.Write(output);
}
elf.Print(Console.Out);
Console.WriteLine();
dwarfFile.AbbreviationTable.Print(Console.Out);
Console.WriteLine();
dwarfFile.AddressRangeTable.Print(Console.Out);
Console.WriteLine();
dwarfFile.InfoSection.Print(Console.Out);
Console.WriteLine("ReadBack --debug-dump=rawline");
var readelf = LinuxUtil.ReadElf(outputFileName, "--debug-dump=rawline").TrimEnd();
Console.WriteLine(readelf);
}
public DwarfData(ElfFile file)
{
_file = file;
//extract compilation units
compilationUnits = DwarfCompilationUnit.ReadCompilationUnits(file);
//extract abbreviations
var abbrevSection = file.GetSection(DwarfSections.Abbrev);
int id = 0;
foreach (var cu in compilationUnits)
{
cu.Abbrev = DwarfAbbreviation.Read(file, (long)cu.AbbrevOffset + abbrevSection.Header.offset);
cu.ReadValues(file);
id++;
}
//build file items tables
var nameTable = new Dictionary <string, DwarfCompilationUnitItem>();
var pcTable = new Dictionary <ulong, DwarfCompilationUnitItem>();
foreach (var unit in compilationUnits)
{
foreach (var dwarfAbbreviationEntry in unit.Abbrev.entries)
{
foreach (var attr in dwarfAbbreviationEntry.attributes)
{
if (attr.attribute == DwarfConstants.DwarfAttribute.DW_AT_MIPS_linkage_name)
{
Console.WriteLine("LN");
}
}
}
foreach (var item in unit.Items)
{
if (item.Pc != 0)
{
pcTable[item.Pc] = item;
}
if (!string.IsNullOrEmpty(item.Name))
{
nameTable[item.Name] = item;
}
}
}
var symbols = file.Sections.SelectMany(v => v.Symbols).ToArray();
var tmpItems = new List <DwarfCompilationUnitItem>();
foreach (var symbol in symbols)
{
DwarfCompilationUnitItem item = null;
//find item corresponding to symbol
if (!string.IsNullOrEmpty(symbol.Name) && nameTable.TryGetValue(symbol.Name, out item) ||
symbol.Header.ValueAddr != 0 && pcTable.TryGetValue(symbol.Header.ValueAddr, out item))
{
if ((int)item.Size == 0)
{
item.Size = symbol.Header.Size;
}
if ((long)item.Pc == 0L)
{
item.Pc = symbol.Header.ValueAddr;
}
//dictionary3[mem.pc] = true;
if (string.IsNullOrEmpty(item.Name))
{
item.Name = symbol.Name;
}
}
else
{
if (!string.IsNullOrEmpty(symbol.Name))
{
item = new DwarfCompilationUnitItem(symbol);
}
}
if (item != null && item.Size != 0 && !string.IsNullOrEmpty(item.Name) && item.HasLine())
{
tmpItems.Add(item);
}
}
//sort members by pc
tmpItems.Sort(((mem, member) => mem.Pc.CompareTo(member.Pc)));
foreach (var unitItem in tmpItems)
{
if (unitItem.Size != 0)
{
DwarfCompilationUnitItem item = null;
if (globalItems.Count > 0)
{
item = globalItems[globalItems.Count - 1];
}
if (item != null && (item.Pc == unitItem.Pc))
{
if (!item.HasLine() && unitItem.HasLine())
{
globalItems[globalItems.Count - 1] = unitItem;
}
else
{
continue;
}
}
else if (item != null && item.Pc <= unitItem.Pc && item.Pc + item.Size > unitItem.Pc)
{
item.Size = (uint)(unitItem.Pc - item.Pc);
}
globalItems.Add(unitItem);
}
}
//fill sections with items
foreach (var item in globalItems)
{
if (item.Size != 0)
{
var index = file.GetSectionId(item.Pc);
if (index >= 0)
{
var section = file.Sections[index];
section.Items.Add(item);
}
}
}
foreach (var section in file.Sections)
{
ulong itemsSize = section.Items.Aggregate <DwarfCompilationUnitItem, ulong>(0, (current, item) => current + item.Size);
var diff = section.Header.size - itemsSize;
if (diff != 0)
{
section.Items.Add(new DwarfCompilationUnitItem()
{
Name = "other", Size = diff
});
}
}
}