3 <title>pcre2_jit_stack_assign specification</title>
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6 <h1>pcre2_jit_stack_assign man page</h1>
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19 <b>#include <pcre2.h></b>
22 <b>void pcre2_jit_stack_assign(pcre2_match_context *<i>mcontext</i>,</b>
23 <b> pcre2_jit_callback <i>callback_function</i>, void *<i>callback_data</i>);</b>
29 This function provides control over the memory used by JIT as a run-time stack
30 when <b>pcre2_match()</b> or <b>pcre2_jit_match()</b> is called with a pattern
31 that has been successfully processed by the JIT compiler. The information that
32 determines which stack is used is put into a match context that is subsequently
33 passed to a matching function. The arguments of this function are:
35 mcontext a pointer to a match context
36 callback a callback function
37 callback_data a JIT stack or a value to be passed to the callback
41 If <i>mcontext</i> is NULL, the function returns immediately, without doing
45 If <i>callback</i> is NULL and <i>callback_data</i> is NULL, an internal 32KiB
46 block on the machine stack is used.
49 If <i>callback</i> is NULL and <i>callback_data</i> is not NULL,
50 <i>callback_data</i> must be a valid JIT stack, the result of calling
51 <b>pcre2_jit_stack_create()</b>.
54 If <i>callback</i> not NULL, it is called with <i>callback_data</i> as an
55 argument at the start of matching, in order to set up a JIT stack. If the
56 result is NULL, the internal 32KiB stack is used; otherwise the return value
57 must be a valid JIT stack, the result of calling
58 <b>pcre2_jit_stack_create()</b>.
61 You may safely use the same JIT stack for multiple patterns, as long as they
62 are all matched in the same thread. In a multithread application, each thread
63 must use its own JIT stack. For more details, see the
64 <a href="pcre2jit.html"><b>pcre2jit</b></a>
68 There is a complete description of the PCRE2 native API in the
69 <a href="pcre2api.html"><b>pcre2api</b></a>
70 page and a description of the POSIX API in the
71 <a href="pcre2posix.html"><b>pcre2posix</b></a>
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