internal void Advance()
{
this.instruction = this.instruction.Next;
}
internal void Reset(Instruction instruction)
{
this.instruction = instruction;
this.success = true;
}
internal MatchContext(Instruction instruction)
{
Reset (instruction);
}
void ResolveBranches()
{
foreach (var instruction in instructions) {
switch (instruction.OpCode.OperandType) {
case OperandType.ShortInlineBrTarget:
case OperandType.InlineBrTarget:
instruction.Operand = GetInstruction (instructions, (int) instruction.Operand);
break;
case OperandType.InlineSwitch:
var offsets = (int []) instruction.Operand;
var branches = new Instruction [offsets.Length];
for (int j = 0; j < offsets.Length; j++)
branches [j] = GetInstruction (instructions, offsets [j]);
instruction.Operand = branches;
break;
}
}
}
void ReadOperand(Instruction instruction)
{
switch (instruction.OpCode.OperandType) {
case OperandType.InlineNone:
break;
case OperandType.InlineSwitch:
int length = il.ReadInt32 ();
int base_offset = il.position + (4 * length);
int [] branches = new int [length];
for (int i = 0; i < length; i++)
branches [i] = il.ReadInt32 () + base_offset;
instruction.Operand = branches;
break;
case OperandType.ShortInlineBrTarget:
instruction.Operand = (((sbyte) il.ReadByte ()) + il.position);
break;
case OperandType.InlineBrTarget:
instruction.Operand = il.ReadInt32 () + il.position;
break;
case OperandType.ShortInlineI:
if (instruction.OpCode == OpCodes.Ldc_I4_S)
instruction.Operand = (sbyte) il.ReadByte ();
else
instruction.Operand = il.ReadByte ();
break;
case OperandType.InlineI:
instruction.Operand = il.ReadInt32 ();
break;
case OperandType.ShortInlineR:
instruction.Operand = il.ReadSingle ();
break;
case OperandType.InlineR:
instruction.Operand = il.ReadDouble ();
break;
case OperandType.InlineI8:
instruction.Operand = il.ReadInt64 ();
break;
case OperandType.InlineSig:
instruction.Operand = module.ResolveSignature (il.ReadInt32 ());
break;
case OperandType.InlineString:
instruction.Operand = module.ResolveString (il.ReadInt32 ());
break;
case OperandType.InlineTok:
case OperandType.InlineType:
case OperandType.InlineMethod:
case OperandType.InlineField:
instruction.Operand = module.ResolveMember (il.ReadInt32 (), type_arguments, method_arguments);
break;
case OperandType.ShortInlineVar:
instruction.Operand = GetVariable (instruction, il.ReadByte ());
break;
case OperandType.InlineVar:
instruction.Operand = GetVariable (instruction, il.ReadInt16 ());
break;
default:
throw new NotSupportedException ();
}
}
object GetVariable(Instruction instruction, int index)
{
return TargetsLocalVariable (instruction.OpCode)
? (object) GetLocalVariable (index)
: (object) GetParameter (index);
}
static void AppendLabel(StringBuilder builder, Instruction instruction)
{
builder.Append ("IL_");
builder.Append (instruction.offset.ToString ("x4"));
}
