private bool TryReadInternal(DwarfReaderWriter reader, ulong abbreviationOffset, DiagnosticBag diagnostics)
{
reader.Offset = abbreviationOffset;
while (TryReadNext(reader, diagnostics))
{
}
return(!diagnostics.HasErrors);
}
public static bool TryRead(DwarfReaderWriter reader, ulong abbreviationOffset, out DwarfAbbreviation abbrev, out DiagnosticBag diagnostics)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
abbrev = new DwarfAbbreviation();
diagnostics = new DiagnosticBag();
return(abbrev.TryReadInternal(reader, abbreviationOffset, diagnostics));
}
public static DwarfAbbreviation Read(DwarfReaderWriter reader, ulong abbreviationOffset)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
if (TryRead(reader, abbreviationOffset, out var abbrev, out var diagnostics))
{
return(abbrev);
}
throw new ObjectFileException($"Unexpected error while trying to read abbreviation at offset {abbreviationOffset}", diagnostics);
}
public DwarfAbbreviation Read(ulong abbreviationOffset)
{
var reader = new DwarfReaderWriter(Stream, true);
return(DwarfAbbreviation.Read(reader, abbreviationOffset));
}
private bool TryReadNext(DwarfReaderWriter reader, DiagnosticBag diagnostics)
{
var code = reader.ReadLEB128();
if (code == 0)
{
return(false);
}
var item = new DwarfAbbreviationItem();
var index = code - 1;
bool canAddToList = _mapItems == null && index < int.MaxValue && _items.Count == (int)index;
item.Tag = reader.ReadLEB128As <DwarfTag>();
var hasChildrenRaw = reader.ReadU8();
bool hasChildren = false;
if (hasChildrenRaw == DwarfNative.DW_CHILDREN_yes)
{
hasChildren = true;
}
else if (hasChildrenRaw != DwarfNative.DW_CHILDREN_no)
{
diagnostics.Error(DiagnosticId.DWARF_ERR_InvalidData, $"Invalid children {hasChildrenRaw}. Must be either {DwarfNative.DW_CHILDREN_yes} or {DwarfNative.DW_CHILDREN_no}");
return(false);
}
item.Code = code;
item.HasChildren = hasChildren;
if (canAddToList)
{
_items.Add(item);
}
else
{
if (_mapItems == null)
{
_mapItems = new Dictionary <ulong, DwarfAbbreviationItem>();
for (var i = 0; i < _items.Count; i++)
{
var previousItem = _items[i];
_mapItems.Add((ulong)i + 1, previousItem);
}
_items.Clear();
}
// TODO: check collisions
if (_mapItems.ContainsKey(code))
{
diagnostics.Error(DiagnosticId.DWARF_ERR_InvalidData, $"Invalid code {code} found while another code already exists in this abbreviation.");
return(false);
}
_mapItems.Add(code, item);
}
List <DwarfAttributeDescriptor> descriptors = null;
while (true)
{
var attributeName = reader.ReadLEB128As <DwarfAttributeName>();
var attributeForm = reader.ReadLEB128As <DwarfAttributeForm>();
if (attributeForm.Value == 0 && attributeForm.Value == 0)
{
break;
}
if (descriptors == null)
{
descriptors = new List <DwarfAttributeDescriptor>(1);
}
descriptors.Add(new DwarfAttributeDescriptor(attributeName, attributeForm));
}
if (descriptors != null)
{
item.Descriptors = descriptors;
}
return(true);
}
