<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <title>new-array</title> <link rel=stylesheet href="opcode.css"> </head> <body> <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> <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> </body> </html>