|
|
|
|
Sponsored Link •
|
|
Advertisement
|
Popping to local variables
For each opcode that pushes a local variable onto the stack
there exists a corresponding opcode that pops the top of the stack back
into the local variable. The names of these opcodes can be formed by replacing
"load" in the names of the push opcodes with "store".
The opcodes that pop ints and floats from the top of the operand stack
to a local variable are listed in the following table. Each of these opcodes
moves one 32-bit value from the top of the stack to a local variable.
| Opcode | Operand(s) | Description |
|---|---|---|
istore |
vindex | pops int to local variable position vindex |
istore_0 |
(none) | pops int to local variable position zero |
istore_1 |
(none) | pops int to local variable position one |
istore_2 |
(none) | pops int to local variable position two |
istore_3 |
(none) | pops int to local variable position three |
fstore |
vindex | pops float to local variable position vindex |
fstore_0 |
(none) | pops float to local variable position zero |
fstore_1 |
(none) | pops float to local variable position one |
fstore_2 |
(none) | pops float to local variable position two |
fstore_3 |
(none) | pops float to local variable position three |
The next table shows the instructions that pop values of type long and double into a local variable. These instructions move a 64-bit value from the top of the operand stack to a local variable.
| Opcode | Operand(s) | Description |
|---|---|---|
lstore |
vindex | pops long to local variable positions vindex and (vindex + 1) |
lstore_0 |
(none) | pops long to local variable positions zero and one |
lstore_1 |
(none) | pops long to local variable positions one and two |
lstore_2 |
(none) | pops long to local variable positions two and three |
lstore_3 |
(none) | pops long to local variable positions three and four |
dstore |
vindex | pops double to local variable positions vindex and (vindex + 1) |
dstore_0 |
(none) | pops double to local variable positions zero and one |
dstore_1 |
(none) | pops double to local variable positions one and two |
dstore_2 |
(none) | pops double to local variable positions two and three |
dstore_3 |
(none) | pops double to local variable positions three and four |
The final group of opcodes that pops to local variables are shown in the following table. These opcodes pop a 32-bit object reference from the top of the operand stack to a local variable.
| Opcode | Operand(s) | Description |
|---|---|---|
astore |
vindex | pops object reference to local variable position vindex |
astore_0 |
(none) | pops object reference to local variable position zero |
astore_1 |
(none) | pops object reference to local variable position one |
astore_2 |
(none) | pops object reference to local variable position two |
astore_3 |
(none) | pops object reference to local variable position three |
|
Sponsored Links
|