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<p>pose a minor problem for <a href="page.php?w=just-in-time_compilation">just-in-time compilation</a>, which involves an interpreter generating machine code on the fly and then running it. The simple solution used by most, historically including <a href="page.php?w=Firefox">Firefox</a>, involves just making the page executable after the interpreter is done writing machine code, using  on Windows or  on Unix-like operating systems. The other solution involves mapping the same region of memory to two pages, one with RW and the other with RX. There</p><p>
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