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> 17 Move a reference to the string specified by the given index into the specified 18 register. 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> 81 None. 82 </p> 83 84 </body> 85 </html> 86
