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✏️ Editing: pcre2_jit_stack_assign.html

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

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This page is part of the PCRE2 HTML documentation. It was generated
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please consult the man page, in case the conversion went wrong.
 
 
SYNOPSIS
 

#include &#60;pcre2.h&#62;


void pcre2_jit_stack_assign(pcre2_match_context *mcontext,
 pcre2_jit_callback callback_function, void *callback_data);

 
DESCRIPTION
 

This function provides control over the memory used by JIT as a run-time stack
when pcre2_match() or pcre2_jit_match() 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>


If mcontext is NULL, the function returns immediately, without doing
anything.


If callback is NULL and callback_data is NULL, an internal 32KiB
block on the machine stack is used.


If callback is NULL and callback_data is not NULL,
callback_data must be a valid JIT stack, the result of calling
pcre2_jit_stack_create().


If callback not NULL, it is called with callback_data 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
pcre2_jit_stack_create().


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">pcre2jit</a>
page.


There is a complete description of the PCRE2 native API in the
<a href="pcre2api.html">pcre2api</a>
page and a description of the POSIX API in the
<a href="pcre2posix.html">pcre2posix</a>
page.

Return to the <a href="index.html">PCRE2 index page</a>.

MR SKB