public void AddTarget(string name, IlAddress target)
{
if (_targets.ContainsKey(name))
{
throw new InvalidOperationException($"Target '{name}' already exsists.");
}
_targets[name] = target;
}
public void AddReference(IlAddress reference, string name)
{
if (_references.ContainsKey(reference))
{
throw new InvalidOperationException("Call site already exsists.");
}
_references[reference] = name;
}
private IlObject?ReadArguments(InstructionCode instruction, ReadOnlySpan <byte> program, ref int pointer)
{
var address = new IlAddress(pointer);
switch (instruction)
{
case InstructionCode.Ldstr:
{
var arg = BinaryConvert.GetString(ref pointer, program);
return(new IlObject(address, 0, arg));
}
case InstructionCode.Ldloc:
case InstructionCode.Stloc:
case InstructionCode.Ldc_i4:
case InstructionCode.Ldarg:
case InstructionCode.Call:
{
var arg = BinaryConvert.GetInt32(ref pointer, program);
return(new IlObject(address, 0, arg));
}
case InstructionCode.Br:
case InstructionCode.Brfalse:
case InstructionCode.Brtrue:
{
var arg = BinaryConvert.GetInt32(ref pointer, program);
_labelTargets.Add(new IlAddress(arg));
return(new IlObject(address, 0, arg));
}
case InstructionCode.Ret:
case InstructionCode.Add:
case InstructionCode.Ceq:
case InstructionCode.Pop:
case InstructionCode.Nop:
{
return(null);
}
default:
{
Throw.NotSupportedInstruction(pointer, program[pointer - 1]);
return(null);
}
}
}
public bool TryGetReference(IlAddress reference, out string method) => _references.TryGetValue(reference, out method);
public static void InvalidStackSize(IlAddress ilAddress, int size)
=> throw new VmExecutionException($"Return failed because of invalid stack size '{size}'. Address: {ilAddress.ToString()}");
public static void ArgumentNotFound(IlAddress ilAddress)
=> throw new VmExecutionException($"Argument not found. Address: {ilAddress.ToString()}");
public static void LocalVariableNotSet(IlAddress ilAddress)
=> throw new VmExecutionException($"Local variable not set. Address: {ilAddress.ToString()}");
public static void StackUnderflowException(IlAddress ilAddress)
=> throw new VmExecutionException($"Stack underflow exception. Address: {ilAddress.ToString()}");
public static void NotSupportedInstruction(IlAddress ilAddress, byte code)
=> throw new VmExecutionException($"Not supported instruction. Address: {ilAddress.ToString()} Code: {InstructionFacts.Format(code)}");
public static void MissingInstructionArgument(IlAddress ilAddress)
=> throw new VmExecutionException($"Required instruction argument missing. Address: {ilAddress.ToString()}");
public static void InvalidInstructionArgument(IlAddress ilAddress)
=> throw new VmExecutionException($"Invalid instruction argument. Address: {ilAddress.ToString()}");
