Function isOpcodeDisabled

txscript/engine.go:340–375

isOpcodeDisabled returns whether or not the opcode is disabled and thus is always bad to see in the instruction stream (even if turned off by a conditional).

(opcode byte)

// always bad to see in the instruction stream (even if turned off by a
// conditional).
func isOpcodeDisabled(opcode byte) bool {
	switch opcode {
	case OP_CAT:
		return true
	case OP_SUBSTR:
		return true
	case OP_LEFT:
		return true
	case OP_RIGHT:
		return true
	case OP_INVERT:
		return true
	case OP_AND:
		return true
	case OP_OR:
		return true
	case OP_XOR:
		return true
	case OP_2MUL:
		return true
	case OP_2DIV:
		return true
	case OP_MUL:
		return true
	case OP_DIV:
		return true
	case OP_MOD:
		return true
	case OP_LSHIFT:
		return true
	case OP_RSHIFT:
		return true
	default:
		return false
	}
}

// isOpcodeAlwaysIllegal returns whether or not the opcode is always illegal
// when passed over by the program counter even if in a non-executed branch (it