/// <summary>
/// Decodes the instruction stream of the reader and populates the compiler.
/// </summary>
/// <param name="compiler">The compiler to populate.</param>
/// <param name="header">The method _header.</param>
private void Decode(IMethodCompiler compiler, ref MethodHeader header)
{
// Start of the code stream
long codeStart = _codeReader.BaseStream.Position;
// End of the code stream
long codeEnd = _codeReader.BaseStream.Position + header.codeSize;
// Prefix instruction
//PrefixInstruction prefix = null;
// Setup context
Context ctx = new Context(InstructionSet, -1);
while (codeEnd != _codeReader.BaseStream.Position)
{
// Determine the instruction offset
int instOffset = (int)(_codeReader.BaseStream.Position - codeStart);
// Read the next opcode From the stream
OpCode op = (OpCode)_codeReader.ReadByte();
if (OpCode.Extop == op)
{
op = (OpCode)(0x100 | _codeReader.ReadByte());
}
ICILInstruction instruction = Instruction.Get(op);
if (instruction == null)
{
throw new Exception("CIL " + op + " is not yet supported");
}
//if (instruction is PrefixInstruction) {
// prefix = instruction as PrefixInstruction;
// continue;
//}
// Create and initialize the corresponding instruction
ctx.AppendInstruction(instruction);
instruction.Decode(ctx, this);
ctx.Label = instOffset;
//ctx.Prefix = prefix;
Debug.Assert(ctx.Instruction != null);
// Do we need to patch branch targets?
if (instruction is IBranchInstruction && instruction.FlowControl != FlowControl.Return)
{
int pc = (int)(_codeReader.BaseStream.Position - codeStart);
for (int i = 0; i < ctx.Branch.Targets.Length; i++)
{
ctx.Branch.Targets[i] += pc;
}
}
//prefix = null;
}
}
/// <summary>
/// Performs stage specific processing on the compiler context.
/// </summary>
public void Run()
{
using (Stream code = methodCompiler.GetInstructionStream())
{
// Initialize the instruction
methodCompiler.InstructionSet = new InstructionSet(256);
// update the base class
InstructionSet = methodCompiler.InstructionSet;
using (codeReader = new BinaryReader(code))
{
// The size of the code in bytes
MethodHeader header = new MethodHeader();
ReadMethodHeader(codeReader, ref header);
if (header.localsSignature.RID != 0)
{
StandAloneSigRow row = methodCompiler.Method.Module.MetadataModule.Metadata.ReadStandAloneSigRow(header.localsSignature);
LocalVariableSignature localsSignature;
if (methodCompiler.Method.DeclaringType is CilGenericType)
{
localsSignature = new LocalVariableSignature(methodCompiler.Method.Module.MetadataModule.Metadata, row.SignatureBlobIdx, (methodCompiler.Method.DeclaringType as CilGenericType).GenericArguments);
}
else
{
localsSignature = new LocalVariableSignature(methodCompiler.Method.Module.MetadataModule.Metadata, row.SignatureBlobIdx);
}
methodCompiler.SetLocalVariableSignature(localsSignature);
}
/* Decode the instructions */
Decode(methodCompiler, ref header);
// When we leave, the operand stack must only contain the locals...
//Debug.Assert(_operandStack.Count == _method.Locals.Count);
}
}
}
/// <summary>
/// Performs stage specific processing on the compiler context.
/// </summary>
public void Run()
{
// The size of the code in bytes
MethodHeader header = new MethodHeader();
using (Stream code = MethodCompiler.GetInstructionStream())
{
// Initalize the instruction, setting the initalize size to 10 times the code stream
MethodCompiler.InstructionSet = new InstructionSet((int)code.Length * 10);
// update the base class
InstructionSet = MethodCompiler.InstructionSet;
using (BinaryReader reader = new BinaryReader(code))
{
_compiler = MethodCompiler;
_method = MethodCompiler.Method;
_codeReader = reader;
ReadMethodHeader(reader, ref header);
//Debug.WriteLine("Decoding " + compiler.Method.ToString());
if (0 != header.localsSignature)
{
StandAloneSigRow row;
IMetadataProvider md = _method.Module.Metadata;
md.Read(header.localsSignature, out row);
MethodCompiler.SetLocalVariableSignature(LocalVariableSignature.Parse(md, row.SignatureBlobIdx));
}
/* Decode the instructions */
Decode(MethodCompiler, ref header);
// When we leave, the operand stack must only contain the locals...
//Debug.Assert(_operandStack.Count == _method.Locals.Count);
_codeReader = null;
_compiler = null;
}
}
}
/// <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>
/// Decodes the instruction stream of the reader and populates the compiler.
/// </summary>
/// <param name="compiler">The compiler to populate.</param>
/// <param name="header">The method _header.</param>
private void Decode(IMethodCompiler compiler, ref MethodHeader header)
{
// Start of the code stream
long codeStart = codeReader.BaseStream.Position;
// End of the code stream
long codeEnd = codeReader.BaseStream.Position + header.codeSize;
// Prefix instruction
//PrefixInstruction prefix = null;
// Setup context
Context ctx = new Context(InstructionSet, -1);
while (codeEnd != codeReader.BaseStream.Position)
{
// Determine the instruction offset
int instOffset = (int)(codeReader.BaseStream.Position - codeStart);
// Read the next opcode from the stream
OpCode op = (OpCode)codeReader.ReadByte();
if (OpCode.Extop == op)
op = (OpCode)(0x100 | codeReader.ReadByte());
ICILInstruction instruction = Instruction.Get(op);
if (instruction == null)
throw new Exception("CIL " + op + " is not yet supported");
//if (instruction is PrefixInstruction) {
// prefix = instruction as PrefixInstruction;
// continue;
//}
// Create and initialize the corresponding instruction
ctx.AppendInstruction(instruction);
ctx.Label = instOffset;
instruction.Decode(ctx, this);
//ctx.Prefix = prefix;
Debug.Assert(ctx.Instruction != null);
// Do we need to patch branch targets?
if (instruction is IBranchInstruction && instruction.FlowControl != FlowControl.Return)
{
int pc = (int)(codeReader.BaseStream.Position - codeStart);
for (int i = 0; i < ctx.Branch.Targets.Length; i++)
ctx.Branch.Targets[i] += pc;
}
//prefix = null;
}
}
/// <summary>
/// Performs stage specific processing on the compiler context.
/// </summary>
public void Run()
{
// The size of the code in bytes
MethodHeader header = new MethodHeader();
using (Stream code = methodCompiler.GetInstructionStream())
{
// Initialize the instruction, setting the initialize size the same as the code stream
methodCompiler.InstructionSet = new InstructionSet((int)code.Length);
// update the base class
InstructionSet = methodCompiler.InstructionSet;
using (BinaryReader reader = new BinaryReader(code))
{
codeReader = reader;
//Debug.WriteLine("Decoding " + methodCompiler.Method.ToString());
ReadMethodHeader(reader, ref header);
if (header.localsSignature != 0)
{
StandAloneSigRow row = methodCompiler.Method.MetadataModule.Metadata.ReadStandAloneSigRow(header.localsSignature);
LocalVariableSignature localsSignature = new LocalVariableSignature(methodCompiler.Method.MetadataModule.Metadata, row.SignatureBlobIdx);
if (methodCompiler.Method.DeclaringType is CilGenericType)
{
localsSignature.ApplyGenericType((methodCompiler.Method.DeclaringType as CilGenericType).GenericArguments);
}
methodCompiler.SetLocalVariableSignature(localsSignature);
}
/* Decode the instructions */
Decode(methodCompiler, ref header);
// When we leave, the operand stack must only contain the locals...
//Debug.Assert(_operandStack.Count == _method.Locals.Count);
codeReader = null;
}
}
}
/// <summary>
/// Performs stage specific processing on the compiler context.
/// </summary>
public void Run()
{
using (Stream code = methodCompiler.GetInstructionStream())
{
// Initialize the instruction
methodCompiler.InstructionSet = new InstructionSet(256);
// update the base class
InstructionSet = methodCompiler.InstructionSet;
using (codeReader = new BinaryReader(code))
{
// The size of the code in bytes
MethodHeader header = new MethodHeader();
ReadMethodHeader(codeReader, ref header);
if (header.localsSignature.RID != 0)
{
StandAloneSigRow row = methodCompiler.Method.Module.MetadataModule.Metadata.ReadStandAloneSigRow(header.localsSignature);
LocalVariableSignature localsSignature;
if (methodCompiler.Method.DeclaringType is CilGenericType)
{
localsSignature = new LocalVariableSignature(methodCompiler.Method.Module.MetadataModule.Metadata, row.SignatureBlobIdx, (methodCompiler.Method.DeclaringType as CilGenericType).GenericArguments);
}
else
{
localsSignature = new LocalVariableSignature(methodCompiler.Method.Module.MetadataModule.Metadata, row.SignatureBlobIdx);
}
methodCompiler.SetLocalVariableSignature(localsSignature);
}
/* Decode the instructions */
Decode(methodCompiler, ref header);
// When we leave, the operand stack must only contain the locals...
//Debug.Assert(_operandStack.Count == _method.Locals.Count);
}
}
}
/// <summary>
/// Performs stage specific processing on the compiler context.
/// </summary>
public void Run()
{
// The size of the code in bytes
MethodHeader header = new MethodHeader();
using (Stream code = MethodCompiler.GetInstructionStream())
{
// Initalize the instruction, setting the initalize size to 10 times the code stream
MethodCompiler.InstructionSet = new InstructionSet((int)code.Length * 10);
// update the base class
InstructionSet = MethodCompiler.InstructionSet;
using (BinaryReader reader = new BinaryReader(code))
{
_compiler = MethodCompiler;
_method = MethodCompiler.Method;
_codeReader = reader;
ReadMethodHeader(reader, ref header);
//Debug.WriteLine("Decoding " + compiler.Method.ToString());
if (0 != header.localsSignature)
{
StandAloneSigRow row;
IMetadataProvider md = _method.Module.Metadata;
md.Read(header.localsSignature, out row);
MethodCompiler.SetLocalVariableSignature(LocalVariableSignature.Parse(md, row.SignatureBlobIdx));
}
/* Decode the instructions */
Decode(MethodCompiler, ref header);
// When we leave, the operand stack must only contain the locals...
//Debug.Assert(_operandStack.Count == _method.Locals.Count);
_codeReader = null;
_compiler = null;
}
}
}
