public Construct VisitSection(Section node)
{
// Ensure function buffer is not null.
if (this.function == null)
{
throw new Exception("Expected function buffer to be set");
}
// Create the block.
LlvmBlock block = this.function.AppendBlock(node.Identifier);
// Set builder.
this.builder = block.Builder;
// Process the section's instructions.
foreach (Instruction inst in node.Instructions)
{
// Visit the instruction.
this.Visit(inst);
// Pop the resulting LLVM instruction off the stack.
this.valueStack.Pop();
}
// Append the block onto the stack.
this.blockStack.Push(block);
// Return the node.
return(node);
}
public Construct VisitIf(If node)
{
// TODO: Action and alternative blocks not being handled, for debugging purposes.
// Visit the condition.
this.Visit(node.Condition);
// Pop the condition off the stack.
LlvmValue conditionValue = this.valueStack.Pop();
// Create a zero-value double for the boolean comparison.
LlvmValue zero = LlvmFactory.Double(0);
// TODO: Hard-coded name.
// Build the comparison, condition will be convered to a boolean for a 'ONE' (non-equal) comparison.
LlvmValue comparison = LLVM.BuildFCmp(this.builder.Unwrap(), LLVMRealPredicate.LLVMRealONE, conditionValue.Unwrap(), zero.Unwrap(), "ifcond").Wrap();
// Retrieve the parent function from the builder.
LlvmFunction function = this.builder.Block.Parent;
// Create the action block.
LlvmBlock action = function.AppendBlock("then");
// TODO: Debugging, Ret void for action.
action.Builder.CreateReturnVoid();
LlvmBlock otherwise = function.AppendBlock("else");
// TODO: Debugging, ret void for otherwise.
otherwise.Builder.CreateReturnVoid();
LlvmBlock merge = function.AppendBlock("ifcont");
// TODO: Debugging, ret void for merge.
merge.Builder.CreateReturnVoid();
// Build the if construct.
LlvmValue @if = LLVM.BuildCondBr(this.builder.Unwrap(), comparison.Unwrap(), action.Unwrap(), otherwise.Unwrap()).Wrap();
// TODO: Complete implementation, based off: https://github.com/microsoft/LLVMSharp/blob/master/KaleidoscopeTutorial/Chapter5/KaleidoscopeLLVM/CodeGenVisitor.cs#L214
// ...
// TODO: Debugging, not complete.
action.Builder.PositionAtEnd(); // ? Delete..
// Append the if construct onto the stack.
this.valueStack.Push(@if);
// Return the node.
return(node);
}
