private Instructions BuildInstructions(Stream source)
{
var instructions = new Instructions();
var reader = new CharReader(source);
var jumpTable = new Stack <int>();
while (reader.HasCharacters())
{
if (IsSetToZero(reader))
{
instructions.Add(new Instruction(InstructionType.SetZero));
}
var c = reader.GetChar();
switch (c)
{
case '+':
instructions.AddRange(DeflateComboInstruction(GetComboInstruction(reader)));
break;
case '-':
instructions.AddRange(DeflateComboInstruction(GetComboInstruction(reader)));
break;
case '>':
instructions.AddRange(DeflateComboInstruction(GetComboInstruction(reader)));
break;
case '<':
instructions.AddRange(DeflateComboInstruction(GetComboInstruction(reader)));
break;
case '.':
instructions.Add(new Instruction(InstructionType.Print));
break;
case ',':
instructions.Add(new Instruction(InstructionType.Read));
break;
case '[':
instructions.Add(new Instruction(InstructionType.BeginLoop));
jumpTable.Push(instructions.Count - 1);
break;
case ']':
var beginPosition = jumpTable.Pop();
var beginInstruction = instructions[beginPosition];
instructions.Add(new Instruction(InstructionType.EndLoop, beginPosition));
beginInstruction.Parameter = instructions.Count - 1;
break;
}
reader.Forward();
}
return(instructions);
}
public void Compile(CompilationModel model)
{
Instructions.AddRange(Block.GetInstructions(model));
// add return instruction on end if it isnt already there
if (Instructions.Count == 0 || (Instructions.Latest().Value != Compiler.Instructions.ReturnInstruction &&
Instructions.Latest().Value != Compiler.Instructions.ReturnIntInstruction &&
Instructions.Latest().Value != Compiler.Instructions.ReturnPointerInstruction))
{
Instructions.Add(new InstructionModel(Compiler.Instructions.ReturnInstruction));
Instructions.Latest().Comment = "Added by compiler";
}
}
public void AddInstructions(params ILOpCodeValues[] instructions)
{
Instructions.AddRange(instructions.Select(x => ILInstruction.Create(x)));
}
public void AddInstructions(params ILInstruction[] instructions)
{
Instructions.AddRange(instructions);
}
public ILMethodBuilder AddRange(Instruction[] instructions)
{
Instructions.AddRange(instructions);
return(this);
}
