| The Android Open Source Project | f6c3871 | 2009-03-03 19:28:47 -0800 | [diff] [blame] | 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> |