WasmNodeResult IWasmOpcodeVisitor <WasmNodeArg, WasmNodeResult> .Visit(EndOpcode opcode, WasmNodeArg arg)
{
if (arg.HasBlock)
{
arg.PopBlock();
}
else
{
throw new WasmNodeException("there is no block to end");
}
return(null);
}
WasmNodeResult IWasmOpcodeVisitor <WasmNodeArg, WasmNodeResult> .Visit(ElseOpcode opcode, WasmNodeArg arg)
{
arg.PopBlock();
var parentNode = arg.Pop();
var ifNode = parentNode as IfNode;
if (ifNode == null)
{
throw new WasmNodeException("if node expected");
}
var elseBlock = new NodesList(ifNode.Signature);
ifNode.Else = elseBlock;
arg.Push(ifNode);
arg.PushBlock(elseBlock);
return(null);
}
