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<title>pcre2_jit_stack_assign specification</title>
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<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 generated
automatically 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 &#60;pcre2.h&#62;</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 stack
when <b>pcre2_match()</b> or <b>pcre2_jit_match()</b> is called with a pattern
that has been successfully processed by the JIT compiler. The information that
determines which stack is used is put into a match context that is subsequently
passed 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 doing
anything.
</P>
<P>
If <i>callback</i> is NULL and <i>callback_data</i> is NULL, an internal 32KiB
block 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 an
argument at the start of matching, in order to set up a JIT stack. If the
result is NULL, the internal 32KiB stack is used; otherwise the return value
must 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 they
are all matched in the same thread. In a multithread application, each thread
must 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>