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Nathan Sidwell ed63c387aa preprocessor: Reimplement raw string lexing [pr95149]
pr95149 is a false positive static analysis checker.  But it
encouranged me to fix raw string lexing, which does contain a
complicated macro and pointers to local variables.  The
reimplementation does away with that macro.  Part of the complication
is we need to undo some of the fresh line processing -- trigraph notes
and escaped line continuations.  But the undone characters need to go
through the raw string processing, as they can legitimately be part of
the prefix marker.  however, in this reformulation we only process one
line marker at a time[*], so there's a limited number of undone
characters.  We can arrange the buffering to make sure we don't split
such an append sequence, and then simply take the characters from the
append buffer.

The prefix scanner had a switch statement, which I discovered was not
optimized as well as an if of a bunch of explicit comparisons (pr
95208 filed).

Finally I adjusted the failure mode.  When we get a bad prefix, we lex
up until the next '"', thus often swallowing the whole raw string.
Previously we'd bail and then the lexer would usually generate stupid
tokens, particularly when meeting the ending '"'.

	libcpp/
	* lex.c (struct lit_accum): New.
	(bufring_append): Replace by lit_accum::append.
	(lex_raw_string): Reimplement, using fragments of the old version.
	(lex_string): Adjust lex_raw_string call.

	gcc/testsuite/
	* c-c++-common/raw-string-14.c: Adjust errors.
	* c-c++-common/raw-string-16.c: Likewise.
	* c-c++-common/raw-string-5.c: Likewise.
2020-05-19 11:39:15 -07:00
config bootstrap: Update requirement to C++11. 2020-05-18 14:29:18 -04:00
contrib mklog.py: improve parsing of struct names (ignore GTY). 2020-05-19 12:33:46 +02:00
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gcc preprocessor: Reimplement raw string lexing [pr95149] 2020-05-19 11:39:15 -07:00
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libatomic x86: Also check if -fcf-protection works 2020-05-15 09:07:17 -07:00
libbacktrace x86: Also check if -fcf-protection works 2020-05-15 09:07:17 -07:00
libcc1 x86: Default CET run-time support to auto 2020-05-14 09:05:02 -07:00
libcpp preprocessor: Reimplement raw string lexing [pr95149] 2020-05-19 11:39:15 -07:00
libdecnumber x86: Default CET run-time support to auto 2020-05-14 09:05:02 -07:00
libffi
libgcc x86: Also check if -fcf-protection works 2020-05-15 09:07:17 -07:00
libgfortran x86: Also check if -fcf-protection works 2020-05-15 09:07:17 -07:00
libgo libgo: only build syscall test with -static if it works 2020-05-15 15:33:20 -07:00
libgomp openmp: Add basic library allocator support. 2020-05-19 14:08:11 +02:00
libhsail-rt
libiberty libiberty: Handle @live attribute in D demangler. 2020-05-15 10:40:47 +02:00
libitm x86: Also check if -fcf-protection works 2020-05-15 09:07:17 -07:00
libobjc x86: Also check if -fcf-protection works 2020-05-15 09:07:17 -07:00
liboffloadmic Add missing ChangeLog entries. 2020-05-05 16:10:13 +02:00
libphobos libphobos: Merge upstream druntime 5cc061a8, phobos 64ed4684f 2020-05-17 18:49:19 +02:00
libquadmath x86: Also check if -fcf-protection works 2020-05-15 09:07:17 -07:00
libsanitizer x86: Also check if -fcf-protection works 2020-05-15 09:07:17 -07:00
libssp x86: Also check if -fcf-protection works 2020-05-15 09:07:17 -07:00
libstdc++-v3 c++: Explain fn template argument type/value mismatches [PR66439] 2020-05-18 23:50:14 -04:00
libvtv x86: Also check if -fcf-protection works 2020-05-15 09:07:17 -07:00
lto-plugin Enable CET in cross compiler if possible 2020-05-12 10:39:54 -07:00
maintainer-scripts Adjust crontab. 2020-04-30 19:25:03 +02:00
zlib x86: Also check if -fcf-protection works 2020-05-15 09:07:17 -07:00
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ChangeLog bootstrap: Update requirement to C++11. 2020-05-18 14:29:18 -04:00
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configure bootstrap: Update requirement to C++11. 2020-05-18 14:29:18 -04:00
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MAINTAINERS MAINTAINERS: Add myself for write after approval. 2020-05-18 12:21:17 +01:00
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