| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> |
| |
| <html> |
| |
| <head> |
| <title>return-object</title> |
| <link rel=stylesheet href="opcode.css"> |
| </head> |
| |
| <body> |
| |
| <h1>return-object</h1> |
| |
| <h2>Purpose</h2> |
| |
| <p> |
| Return from an object-returning method. |
| </p> |
| |
| <h2>Details</h2> |
| |
| <table class="instruc"> |
| <thead> |
| <tr> |
| <th>Op & Format</th> |
| <th>Mnemonic / Syntax</th> |
| <th>Arguments</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>11 11x</td> |
| <td>return-object vAA</td> |
| <td><code>A:</code> return value register (8 bits)</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <h2>Constraints</h2> |
| |
| <ul> |
| <li> |
| The return type of the current method must be a reference. |
| </li> |
| <li> |
| A must be a valid register index in the current stack frame. |
| </li> |
| <li> |
| Register vA must be known to be reference-bearing. |
| </li> |
| </ul> |
| |
| <h2>Behavior</h2> |
| |
| <ul> |
| <li> |
| If the method is synchronized, the object's monitor is released in a way |
| similar to the monitor-exit instruction. |
| </li> |
| <li> |
| The stack frame of the current method invocation is removed from the stack. |
| This includes all its registers becoming invalid. |
| </li> |
| <li> |
| If the stack is now empty, the current thread terminates. |
| </li> |
| <li> |
| Otherwise, the following happens: |
| </li> |
| <ul> |
| <li> |
| The stack frame that caused this method invocation becomes valid. This |
| includes all its registers and their old values. |
| </li> |
| <li> |
| Execution continues at the bytecode instruction immediately following |
| the invoke instruction that caused this method invocation. |
| </li> |
| <li> |
| The return value can be consumed by (exactly) the first instruction |
| following the invoke-kind or invoke-kind/range instruction that caused |
| this method invocation, and this instructions needs to be a |
| move-result-object instruction. |
| </li> |
| </ul> |
| </li> |
| </ul> |
| |
| <h2>Exceptions</h2> |
| |
| <p> |
| None. |
| </p> |
| |
| </body> |
| </html> |
