<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <title>const-class</title> <link rel=stylesheet href="opcode.css"> </head> <body> <h1>const-class</h1> <h2>Purpose</h2> <p> Move a reference to the class specified by the given index into the specified register. In the case where the indicated type is primitive, this will store a reference to the primitive type's degenerate class. </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>1c 21c</td> <td>const-class vAA, type@BBBB</td> <td><code>A:</code> destination register (8 bits)<br/> <code>B:</code> type index</td> </tr> </tbody> </table> <h2>Constraints</h2> <ul> <li> A must be a valid register index in the current stack frame. </li> <li> B must be a valid index into the type constant pool. </li> </ul> <h2>Behavior</h2> <ul> <li> An attempt is made to get a reference to the class C the name of which is contained in type pool entry B. </li> <li> If B refers to a primitive type, the corresponding degenerate class is used instead. </li> <li> If C 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> A reference to C is moved into register vA, that is, vA' = C. </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> ClassNotFoundException is thrown if the class does not exist at all. </li> <li> VerifyError is thrown if the class does exist, but could not be verified. </li> </ul> </body> </html>