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| <head> |
| <title>sget<kind></title> |
| <link rel=stylesheet href="opcode.css"> |
| </head> |
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| <body> |
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| <h1>sget<kind></h1> |
| |
| <h2>Purpose</h2> |
| |
| <p> |
| Perform the identified object static field operation with the identified static |
| field, loading or storing into the value register. |
| </p> |
| <p> |
| Note: These opcodes are reasonable candidates for static linking, altering the |
| field argument to be a more direct offset. |
| </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>60..6d 21c</td> |
| <td>s<i>staticop</i> vAA, field@BBBB<br/> |
| 60: sget<br/> |
| 61: sget-wide<br/> |
| 62: sget-object<br/> |
| 63: sget-boolean<br/> |
| 64: sget-byte<br/> |
| 65: sget-char<br/> |
| 66: sget-short<br/> |
| </td> |
| <td><code>A:</code> dest value register or pair; (8 bits)<br/> |
| <code>B:</code> static field reference index (16 bits)</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <h2>Constraints</h2> |
| |
| <ul> |
| <li> |
| A must be a valid register index in the current stackframe. |
| </li> |
| <li> |
| For the -wide variant, also A+1 must be a valid register index in the |
| current stackframe. |
| </li> |
| <li> |
| B must be a valid index into the field reference pool. |
| </li> |
| <li> |
| The field denoted by B must be static. The type of the field denoted by B |
| must match the variant of the instruction. |
| </li> |
| </ul> |
| |
| <h2>Behavior</h2> |
| |
| <ul> |
| <li> |
| The value of the given instance field is read from the given object and |
| moved into the given register vA, that is, vA'=<class>.<field>. |
| </li> |
| <li> |
| If v(A-1) is the lower half of a register pair, v(A-1)' becomes undefined. |
| </li> |
| <li> |
| For all but the -wide variant, if v(A+1) is the upper half of a register |
| pair, v(A+1)' becomes undefined. |
| </li> |
| <li> |
| For the -wide variant, if v(A+2) is the upper half of a register pair, |
| v(A+2)' becomes undefined. |
| </li> |
| </ul> |
| |
| <h2>Exceptions</h2> |
| |
| <ul> |
| <li> |
| NullPointerException if object is null. |
| </li> |
| <li> |
| IllegalAccessException if <object>.<field> is not visible from |
| the current context according to the usual visibility and access rules of |
| the Java programming language. |
| </li> |
| </ul> |
| |
| </body> |
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