public Construct VisitEndInst(EndInst node)
{
// Visit the value.
this.VisitValue(node.Value);
// Pop off the resulting value.
LlvmValue value = this.valueStack.Pop();
// Create the return instruction.
LlvmValue returnInst = this.builder.CreateReturn(value);
// Append the return instruction onto the stack.
this.valueStack.Push(returnInst);
// Return the node.
return(node);
}
public Instruction Parse(ParserContext context)
{
string?resultIdentifier = null;
if (context.Stream.Current.Type == TokenType.SymbolPercent)
{
context.Stream.Skip();
resultIdentifier = new IdentifierParser().Parse(context);
context.Stream.EnsureCurrent(TokenType.SymbolEqual);
context.Stream.Skip();
}
string name = new IdentifierParser().Parse(context);
// Create a buffer for the current token.
Token token = context.Stream.Get();
// Create the inputs buffer list.
List <IConstruct> inputs = new List <IConstruct>();
// Instruction contains arguments.
while (token.Type != TokenType.SymbolSemiColon)
{
// Invoke the input parser.
IConstruct input = new InputParser().Parse(context);
// Append the input to the list.
inputs.Add(input);
// Update the buffer token.
token = context.Stream.Get();
}
// Ensure current token is of type semi-colon.
context.Stream.EnsureCurrent(TokenType.SymbolSemiColon);
// Skip semi-colon token.
context.Stream.Skip();
Instruction inst;
switch (name)
{
case InstructionName.End:
{
if (inputs.Count > 1)
{
throw new Exception("Unexpected amount of inputs");
}
else if (!(inputs[0] is Value))
{
throw new Exception("Expected input to be a value");
}
inst = new EndInst(inputs[0] as Value);
break;
}
default:
{
throw new Exception($"Unrecognized instruction name: {name}");
}
}
return(inst);
}