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| <title>new-array</title> |
| <link rel=stylesheet href="opcode.css"> |
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| <h1>new-array</h1> |
| |
| <h2>Purpose</h2> |
| |
| <p> |
| Construct a new array of the indicated type and size. The type must be an array |
| type. |
| </p> |
| |
| <h2>Details</h2> |
| |
| <table class="instruc"> |
| <thead> |
| <tr> |
| <th>Op & Format</th> |
| <th>Mnemonic / Syntax</th> |
| <th>Arguments</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>23 22c</td> |
| <td>new-array vA, vB, type@CCCC</td> |
| <td><code>A:</code> destination register (8 bits)<br/> |
| <code>B:</code> size register<br/> |
| <code>C:</code> type index</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <h2>Constraints</h2> |
| |
| <ul> |
| <li> |
| A and B must be valid register indices for the current stack frame. |
| </li> |
| <li> |
| Register vB must not contain a reference value. |
| </li> |
| <li> |
| Register vB must not be part of a register pair. |
| </li> |
| <li> |
| C must be a valid index into the type pool. |
| </li> |
| <li> |
| Type constant pool entry C must contain a valid array type descriptor. |
| </li> |
| </ul> |
| |
| <h2>Behavior</h2> |
| |
| <ul> |
| <li> |
| An attempt is made to get a reference to the class K the name of which is |
| contained in type pool entry C. |
| </li> |
| <li> |
| If K has not been loaded and resolved before, it is being loaded and |
| resolved. All exceptions that are possible during class loading can occur at |
| this point. |
| </li> |
| <li> |
| An attempt is made to create a new instance I of K and length B. All |
| exceptions that are possible during instantiation can occur at this point. |
| </li> |
| <li> |
| All elements of the new array are initialized to null (for object arrays) or |
| 0 (for numeric arrays) or false (for boolean arrays). |
| </li> |
| <li> |
| A reference to the new array is moved to register vA, that is, vA' = I. |
| </li> |
| <li> |
| If v(A-1) is the lower half of a register pair, v(A-1)' becomes undefined. |
| </li> |
| <li> |
| If v(A+1) is the upper half of a register pair, v(A+1)' becomes undefined. |
| </li> |
| </ul> |
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| <h2>Exceptions</h2> |
| |
| <ul> |
| <li> |
| NegativeArraySizeException if vB < 0 |
| </li> |
| <li> |
| All exceptions that are possible during class loading can occur. |
| </li> |
| <li> |
| All exceptions that are possible during instantiation can occur. |
| </li> |
| </ul> |
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