private void RunInstruction(T1Instruction instruction)
{
switch (instruction.Type)
{
// Variable table should contain scope pointer as well as variable id
case T1InstructionType.Assignment:
EvaluateExpression(((T1InstructionAssignment)instruction).Expression);
if (((T1InstructionAssignment)instruction).Variable.VariableType != ExpressionType)
{
throw new Exception("Runtime error: Variable type mismatch in expression");
}
((T1InstructionAssignment)instruction).Variable.Scope.VariableTable[((T1InstructionAssignment)instruction).Variable.VariableId] = new T1Variable(((T1InstructionAssignment)instruction).Variable.VariableType, ExpressionResult);
break;
case T1InstructionType.ConditionalJump:
EvaluateExpression(((T1InstructionConditionalJump)instruction).Expression);
if ((int)ExpressionResult != 0)
{
instructionPointer = LabelTable[((T1InstructionConditionalJump)instruction).LabelId] + 1;
}
break;
case T1InstructionType.ExpressionEvaluation:
EvaluateExpression(((T1InstructionEvaluateExpression)instruction).Expression);
break;
case T1InstructionType.FunctionCall:
T1Scope newScope = (T1Scope)SubScopes[((T1InstructionFunctionCall)instruction).FunctionId]; // .Clone();
newScope.ParentScope = this;
// Variable assignments for arguments
for (int i = 0; i < ((T1InstructionFunctionCall)instruction).Arguments.Count; i++)
{
newScope.VariableTable[i + 1] = new T1Variable(((T1InstructionFunctionCall)instruction).Arguments[i].VariableType, ((T1InstructionFunctionCall)instruction).Arguments[i].Operand);
}
newScope.Run();
break;
case T1InstructionType.FunctionDeclaration:
T1Scope subScope = ((T1InstructionFunctionDeclaration)instruction).FunctionScope;
// Return value
T1Variable returnValue = null;
switch (((T1InstructionFunctionDeclaration)instruction).ReturnType)
{
case T1VariableType.Void:
returnValue = new T1Variable(T1VariableType.Void);
break;
case T1VariableType.Byte:
returnValue = new T1Variable(T1VariableType.Byte);
break;
case T1VariableType.Double:
returnValue = new T1Variable(T1VariableType.Double);
break;
case T1VariableType.Int:
returnValue = new T1Variable(T1VariableType.Int);
break;
case T1VariableType.String:
returnValue = new T1Variable(T1VariableType.String);
break;
}
subScope.VariableTable.Add(returnValue);
// Arguments
for (int i = 0; i < ((T1InstructionFunctionDeclaration)instruction).Arguments.Count; i++)
{
T1Variable newArgument = null;
switch (((T1InstructionFunctionDeclaration)instruction).Arguments[i].VariableType)
{
case T1VariableType.Void:
newArgument = new T1Variable(T1VariableType.Void);
break;
case T1VariableType.Byte:
newArgument = new T1Variable(T1VariableType.Byte);
break;
case T1VariableType.Double:
newArgument = new T1Variable(T1VariableType.Double);
break;
case T1VariableType.Int:
newArgument = new T1Variable(T1VariableType.Int);
break;
case T1VariableType.String:
newArgument = new T1Variable(T1VariableType.String);
break;
}
subScope.VariableTable.Add(newArgument);
}
SubScopes.Add(subScope);
break;
case T1InstructionType.Import:
break;
case T1InstructionType.Jump:
instructionPointer = LabelTable[((T1InstructionJump)instruction).LabelId] + 1;
break;
case T1InstructionType.LabelSet:
LabelTable.Add(instructionPointer);
break;
case T1InstructionType.VariableDeclaration:
T1Variable newVariable = null;
switch (((T1InstructionVariableDeclaration)instruction).VariableType)
{
case T1VariableType.Void:
newVariable = new T1Variable(T1VariableType.Void, VariableTable.Count);
break;
case T1VariableType.Byte:
newVariable = new T1Variable(T1VariableType.Byte, VariableTable.Count);
break;
case T1VariableType.Double:
newVariable = new T1Variable(T1VariableType.Double, VariableTable.Count);
break;
case T1VariableType.Int:
newVariable = new T1Variable(T1VariableType.Int, VariableTable.Count);
break;
case T1VariableType.String:
newVariable = new T1Variable(T1VariableType.String, VariableTable.Count);
break;
}
VariableTable.Add(newVariable);
break;
case T1InstructionType.Return:
instructionPointer = Instructions.Count;
break;
}
}
public void RunInstructions()
{
MainScope.Run();
}