| 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>aput<kind></title> |
| 7 | <link rel=stylesheet href="opcode.css"> |
| 8 | </head> |
| 9 | |
| 10 | <body> |
| 11 | |
| 12 | <h1>aput<kind></h1> |
| 13 | |
| 14 | <h2>Purpose</h2> |
| 15 | |
| 16 | <p> |
| 17 | Waste cycles. |
| 18 | </p> |
| 19 | |
| 20 | <h2>Details</h2> |
| 21 | |
| 22 | <table class="instruc"> |
| 23 | <thead> |
| 24 | <tr> |
| 25 | <th>Op & Format</th> |
| 26 | <th>Mnemonic / Syntax</th> |
| 27 | <th>Arguments</th> |
| 28 | </tr> |
| 29 | </thead> |
| 30 | <tbody> |
| 31 | <tr> |
| 32 | <td>4b..51 23x</td> |
| 33 | <td><i>arrayop</i> vAA, vBB, vCC<br/> |
| 34 | 4b: aput<br/> |
| 35 | 4c: aput-wide<br/> |
| 36 | 4d: aput-object<br/> |
| 37 | 4e: aput-boolean<br/> |
| 38 | 4f: aput-byte<br/> |
| 39 | 50: aput-char<br/> |
| 40 | 51: aput-short |
| 41 | </td> |
| 42 | <td><code>A:</code> source value register or pair; (8 bits)<br/> |
| 43 | <code>B:</code> array register (8 bits)<br/> |
| 44 | <code>C:</code> index register (8 bits)</td> |
| 45 | </tr> |
| 46 | </tbody> |
| 47 | </table> |
| 48 | |
| 49 | <h2>Constraints</h2> |
| 50 | |
| 51 | <ul> |
| 52 | <li> |
| 53 | A, B and C must be valid register indices in the current stack frame. |
| 54 | </li> |
| 55 | <li> |
| 56 | For the aget-wide variant, also A+1 must be a valid register index in the |
| 57 | current stack frame. |
| 58 | </li> |
| 59 | <li> |
| 60 | Register vB must contain an array reference. The component type of the array |
| 61 | must match the variant of the instruction. |
| 62 | </li> |
| 63 | <li> |
| 64 | Register vC must contain an integer value. |
| 65 | </li> |
| 66 | </ul> |
| 67 | |
| 68 | <h2>Behavior</h2> |
| 69 | |
| 70 | <ul> |
| 71 | <li> |
| 72 | For all but the -wide variant, the value of register vA is move into the |
| 73 | array element at the given index, that is, array[index]'=vA. |
| 74 | </li> |
| 75 | <li> |
| 76 | For the -wide variant, the registers vA and v(A+1) are moved into the array |
| 77 | element at the given index as follows: |
| 78 | <ul> |
| 79 | <li> |
| 80 | array[index]' = vA << 0x20 | v(A+1) |
| 81 | </li> |
| 82 | </ul> |
| 83 | </li> |
| 84 | </ul> |
| 85 | |
| 86 | <h2>Exceptions</h2> |
| 87 | |
| 88 | <ul> |
| 89 | <li> |
| 90 | NullPointerException if vB=null. |
| 91 | </li> |
| 92 | <li> |
| 93 | ArrayIndexOutOfBoundsException if vC < 0 or vC >= array.length. |
| 94 | </li> |
| 95 | </ul> |
| 96 | |
| 97 | </body> |
| 98 | </html> |