WhileStatement.cs

namespace MiniSharpCompiler
{
    using LLVMSharp;
    using Microsoft.CodeAnalysis.CSharp.Syntax;

    public partial class LLVMIRGenerationVisitor
    {
        /// <summary>
        /// 8.8.1
        /// </summary>
        public override void VisitWhileStatement(WhileStatementSyntax node)
        {
            LLVMBasicBlockRef condBB = LLVM.AppendBasicBlock(this.function, "while.cond");
            LLVMBasicBlockRef bodyBB = LLVM.AppendBasicBlock(this.function, "while.body");
            LLVMBasicBlockRef endBB = LLVM.AppendBasicBlock(this.function, "while.end");

            this.controlFlowStack.Push(new ControlFlowTarget(condBB, endBB));

            LLVM.BuildBr(this.builder, condBB);

            // condition
            LLVM.PositionBuilderAtEnd(this.builder, condBB);
            LLVM.BuildCondBr(this.builder, this.Pop(node.Condition), bodyBB, endBB);

            // body
            LLVM.PositionBuilderAtEnd(this.builder, bodyBB);
            this.EnterScope();
            this.Visit(node.Statement);
            this.LeaveScope();
            LLVM.BuildBr(this.builder, condBB);

            // end
            LLVM.PositionBuilderAtEnd(this.builder, endBB);

            this.controlFlowStack.Pop();
        }
    }
}