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| <title>move-result</title> |
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| <h1>move-result</h1> |
| |
| <h2>Purpose</h2> |
| |
| <p> |
| Move the single-word non-object result of the most recent invoke-kind into the |
| indicated register. This must be done as the instruction immediately after an |
| invoke-kind whose (single-word, non-object) result is not to be ignored; |
| anywhere else is invalid. |
| </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>0a 11x</td> |
| <td>move-result vAA</td> |
| <td><code>A:</code> destination register (8 bits)</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <h2>Constraints</h2> |
| |
| <ul> |
| <li> |
| A must be a valid register index in the current stack frame. |
| </li> |
| <li> |
| The instruction must be immediately preceded (in the code array) by an |
| invoke-kind instruction. |
| </li> |
| <li> |
| The instruction must be immediately reached (in the actual control flow) |
| through returning from this invoke-kind instruction (it must not be jumped |
| to). |
| </li> |
| <li> |
| The result delivered by the invoke-kind instruction must not be a reference |
| value or require a register pair. |
| </li> |
| </ul> |
| |
| <h2>Behavior</h2> |
| |
| <ul> |
| <li> |
| The result delivered by the invoke-kind instruction is moved to register |
| vA, that is, vA' = result. |
| </li> |
| <li> |
| If register v(A-1) is the lower half of a register pair, register v(A-1)' |
| becomes undefined. |
| </li> |
| <li> |
| If register v(A+1) is the upper half of a register pair, register v(A+1)' |
| becomes undefined. |
| </li> |
| </ul> |
| |
| <h2>Exceptions</h2> |
| |
| <p> |
| None. |
| </p> |
| |
| <h2>Notes</h2> |
| |
| <p> |
| This instruction can also be thought of as reading the contents of a special |
| "result" register that is made valid and defined by executing a non-void return |
| instruction or a filled-new-array instruction. The execution of any other |
| instruction (including this one) renders this special register invalid. |
| </p> |
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