pcre_jit_exec specification

# pcre_jit_exec man page

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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.

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