/// <summary>
/// Протянуть if с метками
/// </summary>
/// <param name="findInstruction">Инструкция, которую мы ищем</param>
/// <param name="instructions">Набор наших инструкций</param>
/// <returns>
/// Вернёт изменённые инструкции, если меток if не более двух
/// </returns>
private static List <Instruction> PropagateIfWithLabel(Instruction findInstruction, List <Instruction> instructions)
{
var findIndexIf = instructions.IndexOf(findInstruction);
if (findIndexIf == -1 ||
instructions.Where(x => instructions[findIndexIf].Label == x.Argument1 && x.Operation == "goto" && x.ToString() != instructions[findIndexIf].ToString()).Count() > 1)
{
return(instructions);
}
var findItem = instructions.Where(x => instructions[findIndexIf].Label == x.Argument1 && x.Operation == "goto").Count() > 0 ?
instructions.Where(x => instructions[findIndexIf].Label == x.Argument1 && x.Operation == "goto").ElementAt(0) :
new Instruction("", "", "", "", "");
var findIndexGoto = instructions.IndexOf(findItem);
if (findIndexGoto == -1)
{
return(instructions);
}
wasChanged = true;
instructions[findIndexGoto] = new Instruction("", instructions[findIndexIf].Operation, instructions[findIndexIf].Argument1, instructions[findIndexIf].Argument2, instructions[findIndexIf].Result);
instructions.RemoveAt(findIndexIf);
if (instructions[findIndexIf].Label == "")
{
instructions[findIndexIf].Label = ThreeAddressCodeTmp.GenTmpLabel();
}
instructions.Insert(findIndexGoto + 1, new Instruction("", "goto", instructions[findIndexIf].Label, "", ""));
return(instructions);
}
/// <summary>
/// Протянуть if с метками
/// </summary>
/// <param name="findInstruction">Инструкция которую мы ищем</param>
/// <param name="instructions">Набор наших инструкций</param>
/// <returns>
/// Вернет измененные инструкции если меткок if не более двух
/// </returns>
private static List <Instruction> StretchIFWithLabel(Instruction findInstruction, List <Instruction> instructions)
{
int findIndexIf = instructions.IndexOf(findInstruction);
if (findIndexIf == -1 ||
instructions.Where(x => instructions[findIndexIf].Label == x.Argument1 && x.Operation == "goto" && x.ToString() != instructions[findIndexIf].ToString()).Count() > 1)
{
return(instructions);
}
int findIndexGoto = instructions.IndexOf(instructions.Where(x => instructions[findIndexIf].Label == x.Argument1 && x.Operation == "goto").ElementAt(0));
wasChanged = true;
if (instructions[findIndexIf + 1].Label == "")
{
instructions[findIndexGoto] = new Instruction("", instructions[findIndexIf].Operation, instructions[findIndexIf].Argument1, instructions[findIndexIf].Argument2, instructions[findIndexIf].Result);
var tmp = ThreeAddressCodeTmp.GenTmpLabel();
instructions[findIndexIf] = new Instruction(tmp, "noop", "", "", "");
instructions.Insert(findIndexGoto + 1, new Instruction("", "goto", tmp, "", ""));
}
else
{
instructions[findIndexGoto] = new Instruction("", instructions[findIndexIf].Operation, instructions[findIndexIf].Argument1, instructions[findIndexIf].Argument2, instructions[findIndexIf].Result);
var tmp = instructions[findIndexIf + 1].Label;
instructions[findIndexIf] = new Instruction("", "noop", "", "", "");
instructions.Insert(findIndexGoto + 1, new Instruction("", "goto", tmp, "", ""));
}
return(instructions);
}
