2014-10-21 18:33:30 +02:00
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<title>pcre2_jit_stack_assign specification</title>
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</head>
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<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
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<h1>pcre2_jit_stack_assign man page</h1>
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<p>
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Return to the <a href="index.html">PCRE2 index page</a>.
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</p>
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<p>
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This page is part of the PCRE2 HTML documentation. It was generated
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automatically from the original man page. If there is any nonsense in it,
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please consult the man page, in case the conversion went wrong.
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<br>
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<br><b>
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SYNOPSIS
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</b><br>
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<P>
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<b>#include <pcre2.h></b>
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</P>
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<P>
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2014-11-11 17:51:07 +01:00
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<b>void pcre2_jit_stack_assign(pcre2_match_context *<i>mcontext</i>,</b>
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2014-10-21 18:33:30 +02:00
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<b> pcre2_jit_callback <i>callback_function</i>, void *<i>callback_data</i>);</b>
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</P>
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<br><b>
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DESCRIPTION
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</b><br>
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<P>
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2014-11-11 17:51:07 +01:00
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This function provides control over the memory used by JIT as a run-time stack
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when <b>pcre2_match()</b> or <b>pcre2_jit_match()</b> is called with a pattern
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that has been successfully processed by the JIT compiler. The information that
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determines which stack is used is put into a match context that is subsequently
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passed to a matching function. The arguments of this function are:
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2014-10-21 18:33:30 +02:00
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<pre>
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2014-11-11 17:51:07 +01:00
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mcontext a pointer to a match context
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2014-10-21 18:33:30 +02:00
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callback a callback function
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callback_data a JIT stack or a value to be passed to the callback
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</PRE>
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</P>
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<P>
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2018-08-13 13:57:09 +02:00
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If <i>mcontext</i> is NULL, the function returns immediately, without doing
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anything.
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2018-06-28 18:26:03 +02:00
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</P>
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<P>
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2018-06-18 16:03:33 +02:00
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If <i>callback</i> is NULL and <i>callback_data</i> is NULL, an internal 32KiB
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2014-10-21 18:33:30 +02:00
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block on the machine stack is used.
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</P>
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<P>
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If <i>callback</i> is NULL and <i>callback_data</i> is not NULL,
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<i>callback_data</i> must be a valid JIT stack, the result of calling
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2014-11-03 18:13:00 +01:00
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<b>pcre2_jit_stack_create()</b>.
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2014-10-21 18:33:30 +02:00
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</P>
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<P>
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If <i>callback</i> not NULL, it is called with <i>callback_data</i> as an
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argument at the start of matching, in order to set up a JIT stack. If the
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2018-06-18 16:03:33 +02:00
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result is NULL, the internal 32KiB stack is used; otherwise the return value
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must be a valid JIT stack, the result of calling
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<b>pcre2_jit_stack_create()</b>.
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2014-10-21 18:33:30 +02:00
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</P>
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<P>
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2014-11-11 17:51:07 +01:00
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You may safely use the same JIT stack for multiple patterns, as long as they
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2014-10-21 18:33:30 +02:00
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are all matched in the same thread. In a multithread application, each thread
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must use its own JIT stack. For more details, see the
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<a href="pcre2jit.html"><b>pcre2jit</b></a>
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page.
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</P>
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<P>
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There is a complete description of the PCRE2 native API in the
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<a href="pcre2api.html"><b>pcre2api</b></a>
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page and a description of the POSIX API in the
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<a href="pcre2posix.html"><b>pcre2posix</b></a>
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page.
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<p>
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Return to the <a href="index.html">PCRE2 index page</a>.
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</p>
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