saload

Operation

Load short from array

Format

saload

Forms

saload = 53 (0x35)

Operand Stack

..., arrayref, index ..., value

Description

The arrayref must be of type reference and must refer to an array whose components are of type short. The index must be of type int. Both arrayref and index are popped from the operand stack. The component of the array at index is retrieved and sign-extended to an int value. That value is pushed onto the operand stack.

Runtime Exceptions

If arrayref is null, saload throws a NullPointerException.

Otherwise, if index is not within the bounds of the array referenced by arrayref, the saload instruction throws an ArrayIndexOutOfBoundsException.

sastore

Operation

Store into short array

Format

sastore

Forms

sastore = 86 (0x56)

Operand Stack

..., array, index, value ...

Description

The arrayref must be of type reference and must refer to an array whose components are of type short. Both index and value must be of type int. The arrayref, index, and value are popped from the operand stack. The int value is truncated to a short and stored as the component of the array indexed by index.

Runtime Exceptions

If arrayref is null, sastore throws a NullPointerException.

Otherwise, if index is not within the bounds of the array referenced by arrayref, the sastore instruction throws an ArrayIndexOutOfBoundsException.

sipush

Operation

Push short

Format

sipush
byte1
byte2

Forms

sipush = 17 (0x11)

Operand Stack

... ..., value

Description

The immediate unsigned byte1 and byte2 values are assembled into an intermediate short where the value of the short is (byte1 << 8) | byte2. The intermediate value is then sign-extended to an int value. That value is pushed onto the operand stack.

swap

Operation

Swap the top two operand stack values

Format

swap

Forms

swap = 95 (0x5f)

Operand Stack

..., value2, value1 ..., value1, value2

Description

Swap the top two values on the operand stack.

The swap instruction must not be used unless value1 and value2 are both values of a category 1 computational type (§3.11.1).

Notes

The Java virtual machine does not provide an instruction implementing a swap on operands of category 2 computational types.

Contents | Prev | Next | Index

The Java^TM Virtual Machine Specification
Copyright © 1999 Sun Microsystems, Inc. All rights reserved
Please send any comments or corrections to jvm@java.sun.com