public static void JumpInstruction(ProgramSource ps, X86Assembly assembly, X86Instruction x86Instruction)
{
if (x86Instruction.OperandCount != 1)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Dst.Type != OperandTypes.Label || x86Instruction.Dst as LabelArgument == null)
throw new WrongParameterException(x86Instruction);
var dst = x86Instruction.Dst as LabelArgument;
string instructionName = x86Instruction.Name;
string realLabel = dst.Label;
if (!assembly.LabelExists(realLabel))
{
throw new LabelMissingException(x86Instruction.Line, realLabel);
}
string label = assembly.InternalNameOf(realLabel);
switch (instructionName)
{
case "jmp":
ps.AddCodeLine("goto ", label);
return;
case "je":
ps.AddJump("ZF == 1", label);
return;
case "jne":
ps.AddJump("ZF == 0", label);
return;
case "jg":
ps.AddJump("ZF == 0 && SF == OF", label);
return;
case "jge":
ps.AddJump("SF == OF", label);
return;
case "jl":
ps.AddJump("SF != OF", label);
return;
case "jle":
ps.AddJump("ZF == 1 || SF != OF", label);
return;
case "jz":
ps.AddJump("ZF == 1", label);
return;
case "jnz":
ps.AddJump("ZF == 0", label);
return;
case "loop":
ps.AddCodeLine("vm.Ecx.Value--");
ps.AddJump("vm.Ecx.Value != 0", label);
return;
}
Debug.Assert(false, "Unknown jump instruction");
}
public static void Generate(ProgramSource ps, X86Assembly assembly, X86Instruction x86Instruction)
{
var translator = new CSharpTranslator(assembly);
var addressTranslator = new CSharpTranslator(assembly, true);
switch (x86Instruction.Name)
{
case "add":
if (x86Instruction.OperandCount != 2)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Dst.Type != OperandTypes.Memory &&
x86Instruction.Dst.Type != OperandTypes.Register)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Src.Type == OperandTypes.Label)
throw new WrongParameterException(x86Instruction);
ps.AddCodeLine(x86Instruction.Dst.GetCode(translator) + " += " +
x86Instruction.Src.GetCode(translator));
break;
case "and":
if (x86Instruction.OperandCount != 2)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Dst.Type != OperandTypes.Memory &&
x86Instruction.Dst.Type != OperandTypes.Register)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Src.Type == OperandTypes.Label)
throw new WrongParameterException(x86Instruction);
ps.AddCodeLine(x86Instruction.Dst.GetCode(translator) + " &= " +
x86Instruction.Src.GetCode(translator));
break;
case "call":
if (x86Instruction.OperandCount != 1)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Dst.Type != OperandTypes.Label)
throw new WrongParameterException(x86Instruction);
string function = x86Instruction.Dst.GetCode(translator);
if (!X86Assembler.IsFunction(function))
throw new UnknownFunctionException(x86Instruction);
ps.AddCodeLine("vm." + x86Instruction.Dst.GetCode(translator) + "()");
break;
case "cmp":
if (x86Instruction.OperandCount != 2)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Src.Type == OperandTypes.Label)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Dst.Type == OperandTypes.Label)
throw new WrongParameterException(x86Instruction);
GenerateCmp(ps, x86Instruction.Dst.GetCode(translator), x86Instruction.Src.GetCode(translator));
break;
case "jmp":
case "je":
case "jne":
case "jg":
case "jge":
case "jl":
case "jle":
case "jz":
case "jnz":
case "loop":
JumpInstruction(ps, assembly, x86Instruction);
break;
case "lea":
if (x86Instruction.OperandCount != 2)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Dst.Type != OperandTypes.Register)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Src.Type == OperandTypes.Label)
{
ps.AddCodeLine(x86Instruction.Dst.GetCode(translator) + " = " +
x86Instruction.Src.GetCode(translator));
break;
}
if (x86Instruction.Src.Type == OperandTypes.Memory)
{
ps.AddCodeLine(x86Instruction.Dst.GetCode(translator) + " = " +
x86Instruction.Src.GetCode(addressTranslator));
break;
}
throw new WrongParameterException(x86Instruction);
case "mov":
if (x86Instruction.OperandCount != 2)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Dst.Type != OperandTypes.Memory &&
x86Instruction.Dst.Type != OperandTypes.Register)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Src.Type == OperandTypes.Label &&
!assembly.ConstantExists(((LabelArgument) x86Instruction.Src).Label))
throw new WrongParameterException(x86Instruction);
ps.AddCodeLine(x86Instruction.Dst.GetCode(translator) + " = " +
x86Instruction.Src.GetCode(translator));
break;
case "mul":
if (x86Instruction.OperandCount != 2)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Dst.Type != OperandTypes.Memory &&
x86Instruction.Dst.Type != OperandTypes.Register)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Src.Type == OperandTypes.Label)
throw new WrongParameterException(x86Instruction);
ps.AddCodeLine(x86Instruction.Dst.GetCode(translator) + " *= " +
x86Instruction.Src.GetCode(translator));
break;
case "or":
if (x86Instruction.OperandCount != 2)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Dst.Type != OperandTypes.Memory &&
x86Instruction.Dst.Type != OperandTypes.Register)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Src.Type == OperandTypes.Label)
throw new WrongParameterException(x86Instruction);
ps.AddCodeLine(x86Instruction.Dst.GetCode(translator) + " |= " +
x86Instruction.Src.GetCode(translator));
break;
case "push":
if (x86Instruction.OperandCount != 1)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Dst.Type != OperandTypes.Register)
throw new WrongParameterException(x86Instruction);
ps.AddCodeLine("vm.Push(" + x86Instruction.Dst.GetCode(translator) + ")");
break;
case "pop":
if (x86Instruction.OperandCount != 1)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Dst.Type != OperandTypes.Register)
throw new WrongParameterException(x86Instruction);
ps.AddCodeLine(x86Instruction.Dst.GetCode(translator) + " = vm.Pop()");
break;
case "ret":
if (x86Instruction.OperandCount != 0)
throw new WrongParameterException(x86Instruction);
ps.AddCodeLine("return;");
break;
case "shl":
if (x86Instruction.OperandCount != 2)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Dst.Type != OperandTypes.Memory &&
x86Instruction.Dst.Type != OperandTypes.Register)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Src.Type == OperandTypes.Label)
throw new WrongParameterException(x86Instruction);
ps.AddCodeLine(x86Instruction.Dst.GetCode(translator) + " <<= " +
x86Instruction.Src.GetCode(translator));
break;
case "shr":
if (x86Instruction.OperandCount != 2)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Dst.Type != OperandTypes.Memory &&
x86Instruction.Dst.Type != OperandTypes.Register)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Src.Type == OperandTypes.Label)
throw new WrongParameterException(x86Instruction);
ps.AddCodeLine(x86Instruction.Dst.GetCode(translator) + " >>= " +
x86Instruction.Src.GetCode(translator));
break;
case "sub":
if (x86Instruction.OperandCount != 2)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Dst.Type != OperandTypes.Memory &&
x86Instruction.Dst.Type != OperandTypes.Register)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Src.Type == OperandTypes.Label)
throw new WrongParameterException(x86Instruction);
ps.AddCodeLine(x86Instruction.Dst.GetCode(translator) + " -= " +
x86Instruction.Src.GetCode(translator));
break;
case "xor":
if (x86Instruction.OperandCount != 2)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Dst.Type != OperandTypes.Memory &&
x86Instruction.Dst.Type != OperandTypes.Register)
throw new WrongParameterException(x86Instruction);
if (x86Instruction.Src.Type == OperandTypes.Label)
throw new WrongParameterException(x86Instruction);
ps.AddCodeLine(x86Instruction.Dst.GetCode(translator) + " ^= " +
x86Instruction.Src.GetCode(translator));
break;
}
}
public void AddInstruction(X86Instruction instruction)
{
_instructions.AddLast(instruction);
}
public void AddInstruction(X86Instruction instruction)
{
_instructions.AddLast(instruction);
}
public WrongParameterException(X86Instruction x86Instruction)
: base("Wrong parameters for instruction " + x86Instruction.Name + " at line: " + x86Instruction.Line + ".")
{
X86Instruction = x86Instruction;
}
public UnknownFunctionException(X86Instruction x86Instruction)
: base("Unknown function" + x86Instruction.Dst + " at line: " + x86Instruction.Line + ".")
{
X86Instruction = x86Instruction;
}
