/[pcre]/code/trunk/doc/pcrejit.3
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revision 767 by ph10, Tue Nov 22 12:24:26 2011 UTC revision 768 by ph10, Sat Nov 26 19:05:39 2011 UTC
# Line 34  The Power PC support is designated as ex Line 34  The Power PC support is designated as ex
34  fully tested. If --enable-jit is set on an unsupported platform, compilation  fully tested. If --enable-jit is set on an unsupported platform, compilation
35  fails.  fails.
36  .P  .P
37  A program can tell if JIT support is available by calling \fBpcre_config()\fP  A program that is linked with PCRE 8.20 or later can tell if JIT support is
38  with the PCRE_CONFIG_JIT option. The result is 1 when JIT is available, and 0  available by calling \fBpcre_config()\fP with the PCRE_CONFIG_JIT option. The
39  otherwise. However, a simple program does not need to check this in order to  result is 1 when JIT is available, and 0 otherwise. However, a simple program
40  use JIT. The API is implemented in a way that falls back to the ordinary PCRE  does not need to check this in order to use JIT. The API is implemented in a
41  code if JIT is not available.  way that falls back to the ordinary PCRE code if JIT is not available.
42    .P
43    If your program may sometimes be linked with versions of PCRE that are older
44    than 8.20, but you want to use JIT when it is available, you can test
45    the values of PCRE_MAJOR and PCRE_MINOR, or the existence of a JIT macro such
46    as PCRE_CONFIG_JIT, for compile-time control of your code.
47  .  .
48  .  .
49  .SH "SIMPLE USE OF JIT"  .SH "SIMPLE USE OF JIT"
# Line 54  You have to do two things to make use of Line 59  You have to do two things to make use of
59        no longer needed instead of just freeing it yourself. This        no longer needed instead of just freeing it yourself. This
60        ensures that any JIT data is also freed.        ensures that any JIT data is also freed.
61  .sp  .sp
62    For a program that may be linked with pre-8.20 versions of PCRE, you can insert
63    .sp
64      #ifndef PCRE_STUDY_JIT_COMPILE
65      #define PCRE_STUDY_JIT_COMPILE 0
66      #endif
67    .sp
68    so that no option is passed to \fBpcre_study()\fP, and then use something like
69    this to free the study data:
70    .sp
71      #ifdef PCRE_CONFIG_JIT
72          pcre_free_study(study_ptr);
73      #else
74          pcre_free(study_ptr);
75      #endif
76    .sp
77  In some circumstances you may need to call additional functions. These are  In some circumstances you may need to call additional functions. These are
78  described in the section entitled  described in the section entitled
79  .\" HTML <a href="#stackcontrol">  .\" HTML <a href="#stackcontrol">
# Line 95  supported. Line 115  supported.
115  .P  .P
116  The unsupported pattern items are:  The unsupported pattern items are:
117  .sp  .sp
118    \eC            match a single byte; not supported in UTF-8 mode    \eC             match a single byte; not supported in UTF-8 mode
119    (?Cn)          callouts    (?Cn)          callouts
120    (*COMMIT)      )    (*COMMIT)      )
121    (*MARK)        )    (*MARK)        )
# Line 337  Cambridge CB2 3QH, England. Line 357  Cambridge CB2 3QH, England.
357  .rs  .rs
358  .sp  .sp
359  .nf  .nf
360  Last updated: 22 November 2011  Last updated: 26 November 2011
361  Copyright (c) 1997-2011 University of Cambridge.  Copyright (c) 1997-2011 University of Cambridge.
362  .fi  .fi

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