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| <head> |
| <title>const-string</title> |
| <link rel=stylesheet href="opcode.css"> |
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| <body> |
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| <h1>const-string</h1> |
| |
| <h2>Purpose</h2> |
| |
| <p> |
| Move a reference to the string specified by the given index into the specified |
| register. |
| </p> |
| |
| <h2>Details</h2> |
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| <table class="instruc"> |
| <thead> |
| <tr> |
| <th>Op & Format</th> |
| <th>Mnemonic / Syntax</th> |
| <th>Arguments</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>1a 21c</td> |
| <td>const-string vAA, string@BBBB</td> |
| <td><code>A:</code> destination register (8 bits)<br/> |
| <code>B:</code> string index</td> |
| </tr> |
| <tr> |
| <td>1b 31c</td> |
| <td>const-string/jumbo vAA, string@BBBBBBBB</td> |
| <td><code>A:</code> destination register (8 bits)<br/> |
| <code>B:</code> string index</td> |
| </tr> |
| </tbody> |
| </table> |
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| <h2>Constraints</h2> |
| |
| <ul> |
| <li> |
| A must be a valid register index in the current stack frame. |
| </li> |
| <li> |
| B must be a valid index into the string constant pool. |
| </li> |
| </ul> |
| |
| <h2>Behavior</h2> |
| |
| <ul> |
| <li> |
| A new java.lang.String object S is allocated on the heap and filled with the |
| contents of string pool entry B. |
| </li> |
| <li> |
| A reference to an internalized version of the new object is moved into |
| register vA, that is, the instruction behaves as if vA' = S.intern() was |
| called. |
| </li> |
| <li> |
| If v(A-1) is the lower half of a register pair, v(A-1)' becomes undefined. |
| </li> |
| <li> |
| If v(A+1) is the upper half of a register pair, v(A+1)' becomes undefined. |
| </li> |
| </ul> |
| |
| <h2>Exceptions</h2> |
| |
| <p> |
| None. |
| </p> |
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