| 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>fill-array-data</title> |
| 7 | <link rel=stylesheet href="opcode.css"> |
| 8 | </head> |
| 9 | |
| 10 | <body> |
| 11 | |
| 12 | <h1>fill-array-data</h1> |
| 13 | |
| 14 | <h2>Purpose</h2> |
| 15 | |
| 16 | <p> |
| 17 | Fill the given array with the indicated data. The reference must be to an array |
| 18 | of primitives, and the data table must match it in type and size. |
| 19 | </p> |
| 20 | <p> |
| 21 | Note: The address of the table is guaranteed to be even (that is, 4-byte |
| 22 | aligned). If the code size of the method is otherwise odd, then an extra code |
| 23 | unit is inserted between the main code and the table whose value is the same as |
| Carl Shapiro | de75089 | 2010-06-08 16:37:12 -0700 | [diff] [blame] | 24 | a nop. |
| The Android Open Source Project | f6c3871 | 2009-03-03 19:28:47 -0800 | [diff] [blame] | 25 | </p> |
| 26 | |
| 27 | <h2>Details</h2> |
| 28 | |
| 29 | <table class="instruc"> |
| 30 | <thead> |
| 31 | <tr> |
| 32 | <th>Op & Format</th> |
| 33 | <th>Mnemonic / Syntax</th> |
| 34 | <th>Arguments</th> |
| 35 | </tr> |
| 36 | </thead> |
| 37 | <tbody> |
| 38 | <td>26 31t</td> |
| 39 | <td>fill-array-data vAA, +BBBBBBBB <i>(with supplemental data as specified |
| 40 | below in "<code>fill-array-data</code> Format")</i></td> |
| 41 | <td><code>A:</code> array reference (8 bits)<br/> |
| 42 | <code>B:</code> signed "branch" offset to table data (32 bits)</td> |
| 43 | </td> |
| 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 | vA must be a reference-bearing register (according to data flow) and contain |
| 55 | an array-reference. |
| 56 | </li> |
| 57 | <li> |
| 58 | B must be branch offset in the same method. |
| 59 | </li> |
| 60 | <li> |
| 61 | The target address (PC+B) must be 4-byte aligned. |
| 62 | </li> |
| 63 | <li> |
| 64 | The target address must hold the pseudo-opcode 0x300. |
| 65 | </li> |
| 66 | <li> |
| 67 | The table entry size must match the size of the data type of the array. |
| 68 | </li> |
| 69 | <li> |
| 70 | The table size must be equal or smaller than the array length. |
| 71 | </li> |
| Carl Shapiro | de75089 | 2010-06-08 16:37:12 -0700 | [diff] [blame] | 72 | </ul> |
| 73 | |
| The Android Open Source Project | f6c3871 | 2009-03-03 19:28:47 -0800 | [diff] [blame] | 74 | <h2>Behavior</h2> |
| 75 | |
| 76 | <ul> |
| 77 | <li> |
| 78 | The contents of the array referenced by vA are filled with the table data, |
| 79 | starting from array index 0 and in the given order. |
| 80 | </li> |
| 81 | <li> |
| 82 | If there are less elements in the table than the array provides space for, |
| 83 | the remaining array elements stay untouched. |
| 84 | </li> |
| 85 | </ul> |
| 86 | |
| 87 | <h2>Exceptions</h2> |
| 88 | |
| 89 | <ul> |
| 90 | <li> |
| Carl Shapiro | de75089 | 2010-06-08 16:37:12 -0700 | [diff] [blame] | 91 | NullPointerException if vA is null. |
| The Android Open Source Project | f6c3871 | 2009-03-03 19:28:47 -0800 | [diff] [blame] | 92 | </li> |
| 93 | </ul> |
| 94 | |
| 95 | </body> |
| 96 | </html> |