| The Android Open Source Project | 89c1feb | 2008-12-17 18:03:55 -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>new-instance</title> |
| 7 | <link rel=stylesheet href="opcode.css"> |
| 8 | </head> |
| 9 | |
| 10 | <body> |
| 11 | |
| 12 | <h1>new-instance</h1> |
| 13 | |
| 14 | <h2>Purpose</h2> |
| 15 | |
| 16 | <p> |
| 17 | Construct a new instance of the indicated type, storing a reference to it in the |
| 18 | destination. The type must refer to a non-array class. |
| 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>22 21c</td> |
| 34 | <td>new-instance vAA, type@BBBB</td> |
| 35 | <td><code>A:</code> destination register (8 bits)<br/> |
| 36 | <code>B:</code> type index</td> |
| 37 | </tr> |
| 38 | </tbody> |
| 39 | </table> |
| 40 | |
| 41 | <h2>Constraints</h2> |
| 42 | |
| 43 | <ul> |
| 44 | <li> |
| 45 | A must be a valid register index for the current stack frame. |
| 46 | </li> |
| 47 | <li> |
| 48 | B must be a valid index into the type pool. |
| 49 | </li> |
| 50 | <li> |
| 51 | Type constant pool entry B must contain a valid type descriptor for a |
| 52 | non-array class. |
| 53 | </li> |
| 54 | </ul> |
| 55 | |
| 56 | <h2>Behavior</h2> |
| 57 | |
| 58 | <ul> |
| 59 | <li> |
| 60 | An attempt is made to get a reference to the class C the name of which is |
| 61 | contained in type pool entry B. |
| 62 | </li> |
| 63 | <li> |
| 64 | If C has not been loaded and resolved before, it is being loaded and |
| 65 | resolved. All exceptions that are possible during class loading can occur at |
| 66 | this point. |
| 67 | </li> |
| 68 | <li> |
| 69 | An attempt is made to create a new instance I of C. All exceptions that are |
| 70 | possible during instantiation can occur at this point. |
| 71 | </li> |
| 72 | <li> |
| 73 | A reference to the new instance is stored in register vA, that is vA' = I. |
| 74 | </li> |
| 75 | <li> |
| 76 | If v(A-1) is the lower part of a register pair, v(A-1)' becomes undefined. |
| 77 | </li> |
| 78 | <li> |
| 79 | If v(A+1) is the upper part of a register pair, v(A+1)' becomes undefined. |
| 80 | </li> |
| 81 | </ul> |
| 82 | |
| 83 | <h2>Exceptions</h2> |
| 84 | |
| 85 | <ul> |
| 86 | <li> |
| 87 | All exceptions that are possible during class loading can occur. |
| 88 | </li> |
| 89 | <li> |
| 90 | All exceptions that are possible during instantiation can occur. |
| 91 | </li> |
| 92 | </ul> |
| 93 | |
| 94 | </body> |
| 95 | </html> |