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>const-string</title> 7<link rel=stylesheet href="opcode.css"> 8</head> 9 10<body> 11 12<h1>const-string</h1> 13 14<h2>Purpose</h2> 15 16<p> 17Move a reference to the string specified by the given index into the specified 18register. 19</p> 20 21<h2>Details</h2> 22 23<table class="instruc"> 24<thead> 25<tr> 26 <th>Op & Format</th> 27 <th>Mnemonic / Syntax</th> 28 <th>Arguments</th> 29</tr> 30</thead> 31<tbody> 32<tr> 33 <td>1a 21c</td> 34 <td>const-string vAA, string@BBBB</td> 35 <td><code>A:</code> destination register (8 bits)<br/> 36 <code>B:</code> string index</td> 37</tr> 38<tr> 39 <td>1b 31c</td> 40 <td>const-string/jumbo vAA, string@BBBBBBBB</td> 41 <td><code>A:</code> destination register (8 bits)<br/> 42 <code>B:</code> string index</td> 43</tr> 44</tbody> 45</table> 46 47<h2>Constraints</h2> 48 49<ul> 50 <li> 51 A must be a valid register index in the current stack frame. 52 </li> 53 <li> 54 B must be a valid index into the string constant pool. 55 </li> 56</ul> 57 58<h2>Behavior</h2> 59 60<ul> 61 <li> 62 A new java.lang.String object S is allocated on the heap and filled with the 63 contents of string pool entry B. 64 </li> 65 <li> 66 A reference to an internalized version of the new object is moved into 67 register vA, that is, the instruction behaves as if vA' = S.intern() was 68 called. 69 </li> 70 <li> 71 If v(A-1) is the lower half of a register pair, v(A-1)' becomes undefined. 72 </li> 73 <li> 74 If v(A+1) is the upper half of a register pair, v(A+1)' becomes undefined. 75 </li> 76</ul> 77 78<h2>Exceptions</h2> 79 80<p> 81None. 82</p> 83 84</body> 85</html> 86