// 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)); }