public static Command FunctionCall(
string name, int argc, LabelGenerator generator)
{
var label = generator.Generate("ret");
return(new Command(
$"call {name} {argc}",
new[]
{
label.Address,
"D=A",
"@R13",
"M=D",
'@' + argc.ToString(),
"D=A",
"@R14",
"M=D",
'@' + name,
"D=A",
"@R15",
"M=D",
"@CALL",
"0;JMP",
label.Declaration
}));
}
public Function(string fileName, string name, int argc)
{
FileName = fileName;
Name = name;
Argc = argc;
LabelGenerator = new LabelGenerator(name);
_commands.Add(Commands.DeclareFunction(name, argc));
}
private static IEnumerable <string> Bootstrapper()
{
var labelGenerator = new LabelGenerator("bootstrapper");
return(new[]
{
"@256",
"D=A",
"@SP",
"M=D"
}.Concat(Commands
.FunctionCall("Sys.init", 0, labelGenerator).HackInstructions));
}
public static Command Parse(string fileName, string line, LabelGenerator generator)
{
var parts = line.Split(' ');
var command = parts[0];
var arg1 = parts.Length > 1 ? parts[1] : null;
var arg2 = parts.Length > 2 ? int.Parse(parts[2]) : 0;
switch (command)
{
case "add": return(Commands.Arithmetic.Add());
case "sub": return(Commands.Arithmetic.Sub());
case "neg": return(Commands.Arithmetic.Neg());
case "and": return(Commands.Bitwise.And());
case "or": return(Commands.Bitwise.Or());
case "not": return(Commands.Bitwise.Not());
case "eq": return(Commands.Comparsion.Equal(generator));
case "gt": return(Commands.Comparsion.GreateThan(generator));
case "lt": return(Commands.Comparsion.LessThan(generator));
case "function": return(Commands.DeclareFunction(arg1, arg2));
case "call": return(Commands.FunctionCall(arg1, arg2, generator));
case "return": return(Commands.FunctionRetrun());
case "goto": return(Commands.Goto(arg1));
case "if-goto": return(Commands.IfGoto(arg1));
case "label": return(Commands.Label(arg1));
case "push":
{
switch (arg1)
{
case "constant": return(Commands.Push.Constant(arg2));
case "local": return(Commands.Push.Local(arg2));
case "argument": return(Commands.Push.Argument(arg2));
case "this": return(Commands.Push.This(arg2));
case "that": return(Commands.Push.That(arg2));
case "temp": return(Commands.Push.Temp(arg2));
case "pointer": return(Commands.Push.Pointer(arg2));
case "static": return(Commands.Push.Static(fileName, arg2));
default: throw new ArgumentException("Invalid segment");
}
}
case "pop":
{
switch (arg1)
{
case "local": return(Commands.Pop.Local(arg2));
case "argument": return(Commands.Pop.Argument(arg2));
case "this": return(Commands.Pop.This(arg2));
case "that": return(Commands.Pop.That(arg2));
case "temp": return(Commands.Pop.Temp(arg2));
case "pointer": return(Commands.Pop.Pointer(arg2));
case "static": return(Commands.Pop.Static(fileName, arg2));
default: throw new ArgumentException("Invalid segment");
}
}
default: throw new InvalidOperationException("Invalid command");
}
}
public static Command LessThan(LabelGenerator generator) =>
Compare("lt", "JGT", generator.Generate("lt"));
public static Command GreateThan(LabelGenerator generator) =>
Compare("gt", "JLT", generator.Generate("gt"));
public static Command Equal(LabelGenerator generator) =>
Compare("eq", "JEQ", generator.Generate("eq"));