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Documentation update.

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Philip.Hazel 2017-05-20 16:25:29 +00:00
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@ -114,7 +114,14 @@ distribution for a new release.
. Run tests in both 32-bit and 64-bit environments if possible. . Run tests in both 32-bit and 64-bit environments if possible.
. Run tests with two different compilers if possible (e.g. clang and gcc). . Run tests with two or more different compilers (e.g. clang and gcc), and
make use of -fsanitize=address and friends where possible. For gcc,
-fsanitize=undefined -std=gnu99 picks up undefined behaviour at runtime, but
needs -fno-sanitize=shift to get rid of warnings for shifts of negative
numbers in the JIT compiler. For clang, -fsanitize=address,undefined,integer
can be used but -fno-sanitize=alignment,shift,unsigned-integer-overflow must
be added when compiling with JIT. Another useful clang option is
-fsanitize=signed-integer-overflow
. Do a test build using CMake. . Do a test build using CMake.
@ -248,14 +255,10 @@ very sensible; some are rather wacky. Some have been on this list for years.
leaves $2 set. In Perl, it's unset. Changing this in PCRE2 will be very hard leaves $2 set. In Perl, it's unset. Changing this in PCRE2 will be very hard
because I think it needs much more state to be remembered. because I think it needs much more state to be remembered.
. Perl 6 will be a revolution. Is it a revolution too far for PCRE?
. An option to use NUL as a line terminator in subject strings. This could be . An option to use NUL as a line terminator in subject strings. This could be
done relatively easily. If it is done, a suitable option for pcre2grep is done relatively easily. If it is done, a suitable option for pcre2grep is
also required. also required.
. Catch SIGSEGV for stack overflows?
. A feature to suspend a match via a callout was once requested. . A feature to suspend a match via a callout was once requested.
. An option to convert results into character offsets and character lengths. . An option to convert results into character offsets and character lengths.
@ -345,13 +348,15 @@ very sensible; some are rather wacky. Some have been on this list for years.
. A limit on substitutions: a user suggested somehow finding a way of making . A limit on substitutions: a user suggested somehow finding a way of making
match_limit apply to the whole operation instead of each match separately. match_limit apply to the whole operation instead of each match separately.
. The (relatively new) initial pre-pass in pcre2_compile() that identifies all . There was a suggestion that Perl should lock out \K in lookarounds. If it
captures could be upgraded to do more parsing, saving the results in a new does, PCRE2 should follow.
vector (on-stack if the pattern is small enough). All comment removal and
escape processing could be done at this stage (so only done once). The code . Redesign handling of class/nclass/xclass because the compile code logic is
for the other two passes would then be simpler. currently very contorted and obscure.
. Some #defines could be replaced with enums to improve robustness.
Philip Hazel Philip Hazel
Email local part: ph10 Email local part: ph10
Email domain: cam.ac.uk Email domain: cam.ac.uk
Last updated: 15 December 2015 Last updated: 20 May 2017