Function opcodeFromAltStack

txscript/opcode.go:1217–1225

opcodeFromAltStack removes the top item from the alternate data stack and pushes it onto the main data stack. Main data stack transformation: [... x1 x2 x3] -> [... x1 x2 x3 y3] Alt data stack transformation: [... y1 y2 y3] -> [... y1 y2]

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

// Main data stack transformation: [... x1 x2 x3] -> [... x1 x2 x3 y3]
// Alt data stack transformation:  [... y1 y2 y3] -> [... y1 y2]
func opcodeFromAltStack(op *opcode, data []byte, vm *Engine) error {
	so, err := vm.astack.PopByteArray()
	if err != nil {
		return err
	}
	vm.dstack.PushByteArray(so)

	return nil
}

// opcode2Drop removes the top 2 items from the data stack.
//