<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <title>const-string</title> <link rel=stylesheet href="opcode.css"> </head> <body> <h1>const-string</h1> <h2>Purpose</h2> <p> Move a reference to the string specified by the given index into the specified register. </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>1a 21c</td> <td>const-string vAA, string@BBBB</td> <td><code>A:</code> destination register (8 bits)<br/> <code>B:</code> string index</td> </tr> <tr> <td>1b 31c</td> <td>const-string/jumbo vAA, string@BBBBBBBB</td> <td><code>A:</code> destination register (8 bits)<br/> <code>B:</code> string 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 string constant pool. </li> </ul> <h2>Behavior</h2> <ul> <li> A new java.lang.String object S is allocated on the heap and filled with the contents of string pool entry B. </li> <li> A reference to an internalized version of the new object is moved into register vA, that is, the instruction behaves as if vA' = S.intern() was called. </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> <p> None. </p> </body> </html>