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<title>pcre2_jit_stack_assign specification</title>
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<h1>pcre2_jit_stack_assign man page</h1>
<p>
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<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.
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