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<html><head><title>pcre2_jit_stack_assign specification</title></head><body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB"><h1>pcre2_jit_stack_assign man page</h1><p>Return to the <a href="index.html">PCRE2 index page</a>.</p><p>This page is part of the PCRE2 HTML documentation. It was generatedautomatically from the original man page. If there is any nonsense in it,please consult the man page, in case the conversion went wrong.<br><br><b>SYNOPSIS</b><br><P><b>#include <pcre2.h></b></P><P><b>void pcre2_jit_stack_assign(pcre2_match_context *<i>mcontext</i>,</b><b> pcre2_jit_callback <i>callback_function</i>, void *<i>callback_data</i>);</b></P><br><b>DESCRIPTION</b><br><P>This function provides control over the memory used by JIT as a run-time stackwhen <b>pcre2_match()</b> or <b>pcre2_jit_match()</b> is called with a patternthat has been successfully processed by the JIT compiler. The information thatdetermines which stack is used is put into a match context that is subsequentlypassed to a matching function. The arguments of this function are:<pre> mcontext a pointer to a match context callback a callback function callback_data a JIT stack or a value to be passed to the callback</PRE></P><P>If <i>mcontext</i> is NULL, the function returns immediately, without doinganything.</P><P>If <i>callback</i> is NULL and <i>callback_data</i> is NULL, an internal 32KiBblock on the machine stack is used.</P><P>If <i>callback</i> is NULL and <i>callback_data</i> is not NULL,<i>callback_data</i> must be a valid JIT stack, the result of calling<b>pcre2_jit_stack_create()</b>.</P><P>If <i>callback</i> not NULL, it is called with <i>callback_data</i> as anargument at the start of matching, in order to set up a JIT stack. If theresult is NULL, the internal 32KiB stack is used; otherwise the return valuemust be a valid JIT stack, the result of calling<b>pcre2_jit_stack_create()</b>.</P><P>You may safely use the same JIT stack for multiple patterns, as long as theyare all matched in the same thread. In a multithread application, each threadmust use its own JIT stack. For more details, see the<a href="pcre2jit.html"><b>pcre2jit</b></a>page.</P><P>There is a complete description of the PCRE2 native API in the<a href="pcre2api.html"><b>pcre2api</b></a>page and a description of the POSIX API in the<a href="pcre2posix.html"><b>pcre2posix</b></a>page.<p>Return to the <a href="index.html">PCRE2 index page</a>.</p>
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