WasmNodeResult IWasmOpcodeVisitor <WasmNodeArg, WasmNodeResult> .Visit(LoopOpcode opcode, WasmNodeArg arg)
{
var loopNode = new LoopNode(opcode.Signature);
arg.Push(loopNode);
arg.PushBlock(loopNode.Nodes);
return(null);
}
WasmNodeResult IWasmOpcodeVisitor <WasmNodeArg, WasmNodeResult> .Visit(BlockOpcode opcode, WasmNodeArg arg)
{
var blockNode = new BlockNode(opcode.Signature);
arg.Push(blockNode);
arg.PushBlock(blockNode.Nodes);
return(null);
}
WasmNodeResult IWasmOpcodeVisitor <WasmNodeArg, WasmNodeResult> .Visit(IfOpcode opcode, WasmNodeArg arg)
{
var condition = arg.Pop();
var ifNode = new IfNode(condition, opcode.Signature);
var thenBlock = new NodesList(opcode.Signature);
ifNode.Then = thenBlock;
arg.Push(ifNode);
arg.PushBlock(thenBlock);
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);
}
