// Visit the loop.
public VisitResult VisitLoop([Antlr4.Runtime.Misc.NotNull] BFParser.LoopContext context)
{
// Add loop blocks.
var start = LLVM.AppendBasicBlock(main, "loop_" + loopCount + "_start");
var end = LLVM.AppendBasicBlock(main, "loop_" + loopCount + "_end");
// Skip everything if value is 0.
LLVM.BuildCondBr(builder, LLVM.BuildICmp(builder, LLVMIntPredicate.LLVMIntNE, GetValue(GetValue(ptr)), LLVM.ConstInt(LLVM.Int8Type(), 0, false), "loop_" + loopCount++ + "_compare"), start, end);
// Instructions inside.
LLVM.PositionBuilderAtEnd(builder, start);
for (int i = 1; i < context.ChildCount - 1; i++)
{
context.children[i].Accept(visitor);
}
// Jump back if value at pointer is nonzero.
LLVM.BuildCondBr(builder, LLVM.BuildICmp(builder, LLVMIntPredicate.LLVMIntNE, GetValue(GetValue(ptr)), LLVM.ConstInt(LLVM.Int8Type(), 0, false), "loop_" + (loopCount - 1) + "_compare2"), start, end);
LLVM.PositionBuilderAtEnd(builder, end);
// Return nothing.
return(null);
}
/// <summary>
/// Exit a parse tree produced by <see cref="BFParser.loop"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitLoop([NotNull] BFParser.LoopContext context)
{
}
/// <summary>
/// Visit a parse tree produced by <see cref="BFParser.loop"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitLoop([NotNull] BFParser.LoopContext context)
{
return(VisitChildren(context));
}
