package vm import ( "errors" "github.com/CityOfZion/neo-go/pkg/vm/stack" ) // vm exceptions // THROWIFNOT faults if the item on the top of the stack // does not evaluate to true // For specific logic on how a number of bytearray is evaluated can be seen // from the boolean conversion methods on the stack items func THROWIFNOT(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) { // Pop item from top of stack item, err := ctx.Estack.Pop() if err != nil { return FAULT, err } // Convert to a boolean ok, err := item.Boolean() if err != nil { return FAULT, err } // If false, throw if !ok.Value() { return FAULT, errors.New("item on top of stack evaluates to false") } return NONE, nil }