public DmdDataStreamImpl(ProcessBinaryReader reader) => this.reader = reader;
public ProcessDataStream(ProcessBinaryReader reader)
{
this.reader = reader;
basePos = reader.Position;
}
public IBinaryReader CreateBodyReader(uint bodyRva, uint mdToken)
{
// bodyRva can be 0 if it's a dynamic module. this.module.Address will also be 0.
if (!module.IsDynamic && bodyRva == 0)
{
return(null);
}
var func = module.CorModule.GetFunctionFromToken(mdToken);
var ilCode = func?.ILCode;
if (ilCode == null)
{
return(null);
}
ulong addr = ilCode.Address;
if (addr == 0)
{
return(null);
}
Debug.Assert(addr >= FAT_HEADER_SIZE);
if (addr < FAT_HEADER_SIZE)
{
return(null);
}
if (module.IsDynamic)
{
// It's always a fat header, see COMDynamicWrite::SetMethodIL() (coreclr/src/vm/comdynamic.cpp)
addr -= FAT_HEADER_SIZE;
var reader = new ProcessBinaryReader(new CorProcessReader(module.Process), 0);
Debug.Assert((reader.Position = (long)addr) == (long)addr);
Debug.Assert((reader.ReadByte() & 7) == 3);
Debug.Assert((reader.Position = (long)addr + 4) == (long)addr + 4);
Debug.Assert(reader.ReadUInt32() == ilCode.Size);
reader.Position = (long)addr;
return(reader);
}
else
{
uint codeSize = ilCode.Size;
// The address to the code is returned but we want the header. Figure out whether
// it's the 1-byte or fat header.
var reader = new ProcessBinaryReader(new CorProcessReader(module.Process), 0);
uint locVarSigTok = func.LocalVarSigToken;
bool isBig = codeSize >= 0x40 || (locVarSigTok & 0x00FFFFFF) != 0;
if (!isBig)
{
reader.Position = (long)addr - 1;
byte b = reader.ReadByte();
var type = b & 7;
if ((type == 2 || type == 6) && (b >> 2) == codeSize)
{
// probably small header
isBig = false;
}
else
{
reader.Position = (long)addr - (long)FAT_HEADER_SIZE + 4;
uint headerCodeSize = reader.ReadUInt32();
uint headerLocVarSigTok = reader.ReadUInt32();
bool valid = headerCodeSize == codeSize &&
(locVarSigTok & 0x00FFFFFF) == (headerLocVarSigTok & 0x00FFFFFF) &&
((locVarSigTok & 0x00FFFFFF) == 0 || locVarSigTok == headerLocVarSigTok);
Debug.Assert(valid);
if (!valid)
{
return(null);
}
isBig = true;
}
}
reader.Position = (long)addr - (long)(isBig ? FAT_HEADER_SIZE : 1);
return(reader);
}
}
