/// <summary>
///
/// </summary>
/// <param name="clause"></param>
private void AddClauseLabels(EhClause clause)
{
AddClauseLabel(clause, clause.TryOffset);
AddClauseLabel(clause, clause.TryEnd);
AddClauseLabel(clause, clause.HandlerOffset);
AddClauseLabel(clause, clause.HandlerEnd);
}
/// <summary>
/// Reads the method header from the instruction stream.
/// </summary>
/// <param name="reader">The reader used to decode the instruction stream.</param>
/// <param name="header">The method header structure to populate.</param>
private void ReadMethodHeader(BinaryReader reader, ref MethodHeader header)
{
// Read first byte
header.flags = (MethodFlags)reader.ReadByte();
// Check least significant 2 bits
switch (header.flags & MethodFlags.HeaderMask)
{
case MethodFlags.TinyFormat:
header.codeSize = ((uint)(header.flags & MethodFlags.TinyCodeSizeMask) >> 2);
header.flags &= MethodFlags.HeaderMask;
break;
case MethodFlags.FatFormat:
// Read second byte of flags
header.flags = (MethodFlags)(reader.ReadByte() << 8 | (byte)header.flags);
if (MethodFlags.ValidHeader != (header.flags & MethodFlags.HeaderSizeMask))
{
throw new InvalidDataException(@"Invalid method _header.");
}
header.maxStack = reader.ReadUInt16();
header.codeSize = reader.ReadUInt32();
header.localsSignature = new Token(reader.ReadUInt32()); // ReadStandAloneSigRow
break;
default:
throw new InvalidDataException(@"Invalid method header while trying to decode " + this.methodCompiler.Method.ToString() + ". (Flags = " + header.flags.ToString("X") + ", Rva = " + this.methodCompiler.Method.Rva + ")");
}
// Are there sections following the code?
if (MethodFlags.MoreSections == (header.flags & MethodFlags.MoreSections))
{
// Yes, seek to them and process those sections
long codepos = reader.BaseStream.Position;
// Seek to the end of the code...
long dataSectPos = codepos + header.codeSize;
if (0 != (dataSectPos & 3))
{
dataSectPos += (4 - (dataSectPos % 4));
}
reader.BaseStream.Position = dataSectPos;
// Read all headers, so the IL decoder knows how to handle these...
byte flags;
do
{
flags = reader.ReadByte();
bool isFat = (0x40 == (flags & 0x40));
int length;
int blocks;
if (isFat)
{
byte[] buffer = new byte[4];
reader.Read(buffer, 0, 3);
length = LittleEndianBitConverter.GetInt32(buffer, 0);
blocks = (length - 4) / 24;
}
else
{
length = reader.ReadByte();
blocks = (length - 4) / 12;
/* Read & skip the padding. */
reader.ReadInt16();
}
Debug.Assert(0x01 == (flags & 0x3F), @"Unsupported method data section.");
// Read the clause
for (int i = 0; i < blocks; i++)
{
EhClause clause = new EhClause();
clause.Read(reader, isFat);
//this.methodCompiler.Method.ExceptionClauseHeader.AddClause(clause);
// FIXME: Create proper basic Blocks for each item in the clause
}
}while (0x80 == (flags & 0x80));
//methodCompiler.Method.ExceptionClauseHeader.Sort();
reader.BaseStream.Position = codepos;
}
}
/// <summary>
/// Reads the method header from the instruction stream.
/// </summary>
/// <param name="reader">The reader used to decode the instruction stream.</param>
/// <param name="header">The method header structure to populate.</param>
private void ReadMethodHeader(BinaryReader reader, ref MethodHeader header)
{
header.flags = (MethodFlags)reader.ReadByte();
switch (header.flags & MethodFlags.HeaderMask)
{
case MethodFlags.TinyFormat:
header.codeSize = ((uint)(header.flags & MethodFlags.TinyCodeSizeMask) >> 2);
header.flags &= MethodFlags.HeaderMask;
break;
case MethodFlags.FatFormat:
header.flags = (MethodFlags)(reader.ReadByte() << 8 | (byte)header.flags);
if (MethodFlags.ValidHeader != (header.flags & MethodFlags.HeaderSizeMask))
throw new InvalidDataException(@"Invalid method _header.");
header.maxStack = reader.ReadUInt16();
header.codeSize = reader.ReadUInt32();
header.localsSignature = (TokenTypes)reader.ReadUInt32();
break;
default:
throw new InvalidDataException(@"Invalid method header.");
}
// Are there sections following the code?
if (MethodFlags.MoreSections == (header.flags & MethodFlags.MoreSections))
{
// Yes, seek to them and process those sections
long codepos = reader.BaseStream.Position;
// Seek to the end of the code...
long dataSectPos = codepos + header.codeSize;
if (0 != (dataSectPos & 3))
dataSectPos += (4 - (dataSectPos % 4));
reader.BaseStream.Position = dataSectPos;
// Read all headers, so the IL decoder knows how to handle these...
byte flags;
do
{
flags = reader.ReadByte();
bool isFat = (0x40 == (flags & 0x40));
int length;
int blocks;
if (isFat)
{
byte[] buffer = new byte[4];
reader.Read(buffer, 0, 3);
length = LittleEndianBitConverter.GetInt32(buffer, 0);
blocks = (length - 4) / 24;
}
else
{
length = reader.ReadByte();
blocks = (length - 4) / 12;
/* Read & skip the padding. */
reader.ReadInt16();
}
Debug.Assert(0x01 == (flags & 0x3F), @"Unsupported method data section.");
// Read the clause
for (int i = 0; i < blocks; i++)
{
EhClause clause = new EhClause();
clause.Read(reader, isFat);
this.methodCompiler.Method.ExceptionClauseHeader.AddClause(clause);
// FIXME: Create proper basic Blocks for each item in the clause
}
}
while (0x80 == (flags & 0x80));
methodCompiler.Method.ExceptionClauseHeader.Sort();
reader.BaseStream.Position = codepos;
}
}
/// <summary>
///
/// </summary>
/// <param name="clause"></param>
public void AddClause(EhClause clause)
{
this.Clauses.Add(clause);
}
/// <summary>
///
/// </summary>
/// <param name="clause"></param>
/// <param name="label"></param>
private void AddClauseLabel(EhClause clause, int label)
{
this.labelMapping[label] = clause;
}
/// <summary>
///
/// </summary>
/// <param name="clause"></param>
public void AddClause(EhClause clause)
{
this.Clauses.Add(clause);
}