Home | History | Annotate | Download | only in opcodes 
      1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
      2 
      3 <html>
      4 
      5 <head>
      6 <title>new-instance</title>
      7 <link rel=stylesheet href="opcode.css">
      8 </head>
      9 
     10 <body>
     11 
     12 <h1>new-instance</h1>
     13 
     14 <h2>Purpose</h2>
     15 
     16 <p>
     17 Construct a new instance of the indicated type, storing a reference to it in the
     18 destination. The type must refer to a non-array class. 
     19 </p>
     20 
     21 <h2>Details</h2>
     22 
     23 <table class="instruc">
     24 <thead>
     25 <tr>
     26   <th>Op &amp; Format</th>
     27   <th>Mnemonic / Syntax</th>
     28   <th>Arguments</th>
     29 </tr>
     30 </thead>
     31 <tbody>
     32 <tr>
     33   <td>22 21c</td>
     34   <td>new-instance vAA, type@BBBB</td>
     35   <td><code>A:</code> destination register (8 bits)<br/>
     36     <code>B:</code> type index</td>
     37 </tr>
     38 </tbody>
     39 </table>
     40 
     41 <h2>Constraints</h2>
     42 
     43 <ul>
     44   <li>
     45     A must be a valid register index for the current stack frame.
     46   </li>
     47   <li>
     48     B must be a valid index into the type pool.
     49   </li>
     50   <li>
     51     Type constant pool entry B must contain a valid type descriptor for a
     52     non-array class.
     53   </li>
     54 </ul>
     55 
     56 <h2>Behavior</h2>
     57 
     58 <ul>
     59   <li>
     60     An attempt is made to get a reference to the class C the name of which is
     61     contained in type pool entry B.
     62   </li>
     63   <li>
     64     If C has not been loaded and resolved before, it is being loaded and
     65     resolved. All exceptions that are possible during class loading can occur at
     66     this point.
     67   </li>
     68   <li>
     69     An attempt is made to create a new instance I of C. All exceptions that are
     70     possible during instantiation can occur at this point.
     71   </li>
     72   <li>
     73     A reference to the new instance is stored in register vA, that is vA' = I.
     74   </li>
     75   <li>
     76     If v(A-1) is the lower part of a register pair, v(A-1)' becomes undefined.
     77   </li>
     78   <li>
     79     If v(A+1) is the upper part of a register pair, v(A+1)' becomes undefined.
     80   </li>     
     81 </ul>
     82 
     83 <h2>Exceptions</h2>
     84 
     85 <ul>
     86   <li>
     87     All exceptions that are possible during class loading can occur.
     88   </li>
     89   <li>
     90     All exceptions that are possible during instantiation can occur.
     91   </li> 
     92 </ul>
     93 
     94 </body>
     95 </html>
     96