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msys2/usr/share/doc/pcre/pcre.txt
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@ -8365,7 +8365,11 @@ AVAILABILITY OF JIT SUPPORT
If your program may sometimes be linked with versions of PCRE that are
older than 8.20, but you want to use JIT when it is available, you can
test the values of PCRE_MAJOR and PCRE_MINOR, or the existence of a JIT
macro such as PCRE_CONFIG_JIT, for compile-time control of your code.
macro such as PCRE_CONFIG_JIT, for compile-time control of your code.
Also beware that the pcre_jit_exec() function was not available at all
before 8.32, and may not be available at all if PCRE isn't compiled
with --enable-jit. See the "JIT FAST PATH API" section below for
details.
SIMPLE USE OF JIT
@ -8407,6 +8411,18 @@ SIMPLE USE OF JIT
PCRE_STUDY_JIT_PARTIAL_HARD_COMPILE
PCRE_STUDY_JIT_PARTIAL_SOFT_COMPILE
If using pcre_jit_exec() and supporting a pre-8.32 version of PCRE, you
can insert:
#if PCRE_MAJOR >= 8 && PCRE_MINOR >= 32
pcre_jit_exec(...);
#else
pcre_exec(...)
#endif
but as described in the "JIT FAST PATH API" section below this assumes
version 8.32 and later are compiled with --enable-jit, which may break.
The JIT compiler generates different optimized code for each of the
three modes (normal, soft partial, hard partial). When pcre_exec() is
called, the appropriate code is run if it is available. Otherwise, the
@ -8696,6 +8712,33 @@ JIT FAST PATH API
Bypassing the sanity checks and the pcre_exec() wrapping can give
speedups of more than 10%.
Note that the pcre_jit_exec() function is not available in versions of
PCRE before 8.32 (released in November 2012). If you need to support
versions that old you must either use the slower pcre_exec(), or switch
between the two codepaths by checking the values of PCRE_MAJOR and
PCRE_MINOR.
Due to an unfortunate implementation oversight, even in versions 8.32
and later there will be no pcre_jit_exec() stub function defined when
PCRE is compiled with --disable-jit, which is the default, and there's
no way to detect whether PCRE was compiled with --enable-jit via a
macro.
If you need to support versions older than 8.32, or versions that may
not build with --enable-jit, you must either use the slower
pcre_exec(), or switch between the two codepaths by checking the values
of PCRE_MAJOR and PCRE_MINOR.
Switching between the two by checking the version assumes that all the
versions being targeted are built with --enable-jit. To also support
builds that may use --disable-jit either pcre_exec() must be used, or a
compile-time check for JIT via pcre_config() (which assumes the runtime
environment will be the same), or as the Git project decided to do,
simply assume that pcre_jit_exec() is present in 8.32 or later unless a
compile-time flag is provided, see the "grep: un-break building with
PCRE >= 8.32 without --enable-jit" commit in git.git for an example of
that.
SEE ALSO
@ -8711,8 +8754,8 @@ AUTHOR
REVISION
Last updated: 17 March 2013
Copyright (c) 1997-2013 University of Cambridge.
Last updated: 05 July 2017
Copyright (c) 1997-2017 University of Cambridge.
------------------------------------------------------------------------------