Branch if reference is null

Format

ifnull

branch

Forms

ifnull = 102 (0x66)

Stack

…, value → …

Description

The value must be of type reference. It is popped from the operand stack. If the value is null, branch is used as signed 8-bit offset, and execution proceeds at that offset from the address of the opcode of this ifnull instruction. The target address must be that of an opcode of an instruction within the method that contains this ifnull instruction.

Otherwise, execution proceeds at the address of the instruction following this ifnull instruction.