Function opcodeSwap

txscript/opcode.go:1367–1369

opcodeSwap swaps the top two items on the stack. Stack transformation: [... x1 x2] -> [... x2 x1]

(op *opcode, data []byte, vm *Engine)

//
// Stack transformation: [... x1 x2] -> [... x2 x1]
func opcodeSwap(op *opcode, data []byte, vm *Engine) error {
	return vm.dstack.SwapN(1)
}

// opcodeTuck inserts a duplicate of the top item of the data stack before the
// second-to-top item.