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istore

store integer in local variable

Jasmin Syntax 


    istore <varnum>
or
    wide
    istore <varnum>
In the first form, <varnum> is an unsigned integer in the range 0 to 0xFF. In the second (wide) form, <varnum> is an unsigned integer in the range 0 to 0xFFFF.

Stack

Before

After
value
...
...

Description

Pops an in off the stack and stores it in local variable <varnum>. The istore instruction takes a single parameter, <varnum>, an unsigned integer which indicates which local variable should be used. <varnum> must be a valid local variable number in the current frame.

Example 


bipush 10       ; push 10 onto the stack
istore 3        ; pop 10 off of the stack and store it in local variable 3
Bytecode

For local variable numbers in the range 0-255, use:

Type

Description
u1
istore opcode = 0x36 (54)
u1
<varnum>
There is also a wide format for this instruction, which supports access to all local variables from 0 to 65535:

Type

Description
u1
wide opcode = 0xC4 (196)
u1
istore opcode = 0x36 (54)
u2
<varnum>
See Also

lstore, fstore, dstore, astore, wide

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Java Virtual Machine, by Jon Meyer and Troy Downing, O'Reilly Associates