pcre_assign_jit_stack(3) [centos man page]

PCRE_ASSIGN_JIT_STACK(3)				     Library Functions Manual					  PCRE_ASSIGN_JIT_STACK(3)

NAME

       PCRE - Perl-compatible regular expressions

SYNOPSIS


       #include <pcre.h>

       void pcre_assign_jit_stack(pcre_extra *extra,
	    pcre_jit_callback callback, void *data);

       void pcre16_assign_jit_stack(pcre16_extra *extra,
	    pcre16_jit_callback callback, void *data);

       void pcre32_assign_jit_stack(pcre32_extra *extra,
	    pcre32_jit_callback callback, void *data);

DESCRIPTION


       This  function  provides  control  over the memory used as a stack at run-time by a call to pcre[16|32]_exec() with a pattern that has been
       successfully compiled with JIT optimization. The arguments are:

	 extra	   the data pointer returned by pcre[16|32]_study()
	 callback  a callback function
	 data	   a JIT stack or a value to be passed to the callback
		     function

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

       If callback is NULL and data is not NULL, data must be a valid JIT stack, the result of calling pcre[16|32]_jit_stack_alloc().

       If callback not NULL, it is called with data as an argument at the start of matching, in order to set up a JIT  stack.  If  the	result	is
       NULL,   the   internal	32K   stack   is   used;  otherwise  the  return  value  must  be  a  valid  JIT  stack,  the  result  of  calling
       pcre[16|32]_jit_stack_alloc().

       You may safely assign the same JIT stack to multiple patterns, as long as they are all matched in the same thread. In a multithread  appli-
       cation, each thread must use its own JIT stack. For more details, see the pcrejit page.

       There is a complete description of the PCRE native API in the pcreapi page and a description of the POSIX API in the pcreposix page.

PCRE 8.30							   24 June 2012 					  PCRE_ASSIGN_JIT_STACK(3)

PCRE_EXEC(3)						     Library Functions Manual						      PCRE_EXEC(3)

NAME

       PCRE - Perl-compatible regular expressions

SYNOPSIS


       #include <pcre.h>

       int pcre_jit_exec(const pcre *code, const pcre_extra *extra,
	    const char *subject, int length, int startoffset,
	    int options, int *ovector, int ovecsize,
	    pcre_jit_stack *jstack);

       int pcre16_jit_exec(const pcre16 *code, const pcre16_extra *extra,
	    PCRE_SPTR16 subject, int length, int startoffset,
	    int options, int *ovector, int ovecsize,
	    pcre_jit_stack *jstack);

       int pcre32_jit_exec(const pcre32 *code, const pcre32_extra *extra,
	    PCRE_SPTR32 subject, int length, int startoffset,
	    int options, int *ovector, int ovecsize,
	    pcre_jit_stack *jstack);

DESCRIPTION


       This  function matches a compiled regular expression that has been successfully studied with one of the JIT options against a given subject
       string, using a matching algorithm that is similar to Perl's. It is a "fast path" interface to JIT, and it  bypasses  some  of  the  sanity
       checks that pcre_exec() applies.  It returns offsets to captured substrings. Its arguments are:

	 code	      Points to the compiled pattern
	 extra	      Points to an associated pcre[16|32]_extra structure,
			or is NULL
	 subject      Points to the subject string
	 length       Length of the subject string, in bytes
	 startoffset  Offset in bytes in the subject at which to
			start matching
	 options      Option bits
	 ovector      Points to a vector of ints for result offsets
	 ovecsize     Number of elements in the vector (a multiple of 3)
	 jstack       Pointer to a JIT stack

       The allowed options are:

	 PCRE_NOTBOL		Subject string is not the beginning of a line
	 PCRE_NOTEOL		Subject string is not the end of a line
	 PCRE_NOTEMPTY		An empty string is not a valid match
	 PCRE_NOTEMPTY_ATSTART	An empty string at the start of the subject
				  is not a valid match
	 PCRE_NO_UTF16_CHECK	Do not check the subject for UTF-16
				  validity (only relevant if PCRE_UTF16
				  was set at compile time)
	 PCRE_NO_UTF32_CHECK	Do not check the subject for UTF-32
				  validity (only relevant if PCRE_UTF32
				  was set at compile time)
	 PCRE_NO_UTF8_CHECK	Do not check the subject for UTF-8
				  validity (only relevant if PCRE_UTF8
				  was set at compile time)
	 PCRE_PARTIAL		) Return PCRE_ERROR_PARTIAL for a partial
	 PCRE_PARTIAL_SOFT	)   match if no full matches are found
	 PCRE_PARTIAL_HARD	Return PCRE_ERROR_PARTIAL for a partial match
				  if that is found before a full match

       However,  the  PCRE_NO_UTF[8|16|32]_CHECK  options have no effect, as this check is never applied. For details of partial matching, see the
       pcrepartial page. A pcre_extra structure contains the following fields:

	 flags		  Bits indicating which fields are set
	 study_data	  Opaque data from pcre[16|32]_study()
	 match_limit	  Limit on internal resource use
	 match_limit_recursion	Limit on internal recursion depth
	 callout_data	  Opaque data passed back to callouts
	 tables 	  Points to character tables or is NULL
	 mark		  For passing back a *MARK pointer
	 executable_jit   Opaque data from JIT compilation

       The   flag   bits   are	 PCRE_EXTRA_STUDY_DATA,   PCRE_EXTRA_MATCH_LIMIT,    PCRE_EXTRA_MATCH_LIMIT_RECURSION,	  PCRE_EXTRA_CALLOUT_DATA,
       PCRE_EXTRA_TABLES, PCRE_EXTRA_MARK and PCRE_EXTRA_EXECUTABLE_JIT.

       There is a complete description of the PCRE native API in the pcreapi page and a description of the JIT API in the pcrejit page.

PCRE 8.30							  31 October 2012						      PCRE_EXEC(3)