+2011-02-06 Joel E. Denny <joeldenny@joeldenny.org>
+
+ doc: clean up new subsections in manual.
+ * doc/bison.texinfo (%define Summary): Reword so it reads well as
+ a separate section. For example, add an intro, and move most of
+ the text outside of the @deffn so it is not indented so far.
+ (%code Summary): Likewise.
+ (Table of Symbols): Reword %code entry to match the %code entry in
+ Decl Summary.
+
+2011-02-06 Joel E. Denny <joeldenny@joeldenny.org>
+
+ doc: finish splitting apart the manual's Decl Summary section.
+ Suggested by Akim Demaille at
+ <http://lists.gnu.org/archive/html/bison-patches/2009-05/msg00013.html>.
+ * doc/bison.texinfo (Decl Summary): Extract most of the %define
+ entry into...
+ (%define Summary): ... this new subsection, and update all
+ cross-references. For readability of the patches, rewriting of
+ the text so it makes sense as a separate subsection will come in a
+ later patch. Moreover, the majority of the text describing the
+ various new LR features should likely move to another new section
+ somewhere.
+
+2011-02-06 Joel E. Denny <joeldenny@joeldenny.org>
+
+ doc: begin to split apart the manual's Decl Summary section.
+ Discussed in thread starting at
+ <http://lists.gnu.org/archive/html/bison-patches/2009-05/msg00013.html>.
+ * doc/bison.texinfo (Decl Summary): Extract most of the %code
+ entry into...
+ (%code Summary): ... this new subsection, and update all
+ cross-references. For readability of the patches, rewriting of
+ the text so it makes sense as a separate subsection will come in a
+ later patch.
+
+2011-02-06 Joel E. Denny <joeldenny@joeldenny.org>
+
+ doc: clean up naming of various Bison files.
+ The Bison manual's names for various files associated with a Bison
+ parser has devolved into inconsistency. This patch makes the
+ naming consistent for the most important files. First, it chooses
+ "grammar file" over "input file". The former appears to be more
+ traditional in the Bison manual, and Bison has other input
+ files (skeletons). Second, it chooses "parser implementation
+ file" over names like "parser file", "parser source file", "parser
+ source code file", and "parser output file". The new name makes
+ it clearer where Bison generates the main parser implementation,
+ and it is easily distinguishable from "parser header file".
+ * doc/bison.texinfo: Implement throughout.
+
+2011-02-06 Joel E. Denny <joeldenny@joeldenny.org>
+
+ doc: give credit to more of Bison's developers.
+ * doc/bison.texinfo (Introduction): Don't imply that only Robert
+ Corbett, Richard Stallman, and Wilfred Hansen have contributed to
+ Bison. However, I don't have time to write a full history, so
+ just point readers to THANKS and ChangeLog.
+
+2011-02-06 Joel E. Denny <joeldenny@joeldenny.org>
+
+ doc: document experimental features better.
+ * doc/bison.texinfo (Introduction): Say that IELR(1) and canonical
+ LR(1) are experimental. Mention Java. Normally experimental
+ features probably shouldn't be mentioned in the introduction.
+ However, if Bison's limitations to LALR(1), C, and C++ are so
+ important that they should be mentioned here, then it's important
+ to point out that Bison is beginning to escape those limitations.
+ Moreover, these particular experimental features have very little
+ chance of being removed.
+ * src/getargs.c (usage): Say that IELR(1) and canonical LR(1) are
+ experimental.
+
+2011-01-29 Joel E. Denny <joeldenny@joeldenny.org>
+
+ Do not allow identifiers that start with a dash.
+ This cleans up our previous fixes for a bug whereby Bison
+ discarded `.field' in `$-1.field'. The previous fixes were less
+ restrictive about where a dash could appear in an identifier, but
+ the restrictions were hard to explain. That bug was reported and
+ this final fix was originally suggested by Paul Hilfinger. This
+ also fixes a remaining bug reported by Paul Eggert whereby Bison
+ parses `%token ID -123' as `%token ID - 123' and handles `-' as an
+ identifier. Now, `-' cannot be an identifier. Discussed in
+ threads beginning at
+ <http://lists.gnu.org/archive/html/bug-bison/2011-01/msg00000.html>,
+ <http://lists.gnu.org/archive/html/bug-bison/2011-01/msg00004.html>.
+ * NEWS (2.5): Update entry describing the dash extension to
+ grammar symbol names. Also, move that entry before the named
+ references entry because the latter mentions the former.
+ * doc/bison.texinfo (Symbol): Update documentation for symbol
+ names. As suggested by Paul Eggert, mention the effect of periods
+ and dashes on named references.
+ (Decl Summary): Update documentation for unquoted %define values,
+ which, as a side effect, can no longer start with dashes either.
+ * src/scan-code.l (id): Implement.
+ * src/scan-gram.l (id): Implement.
+ * tests/actions.at (Exotic Dollars): Extend test group to exercise
+ bug reported by Paul Hilfinger.
+ * tests/input.at (Symbols): Update test group, and extend to
+ exercise bug reported by Paul Eggert.
+ * tests/named-refs.at (Stray symbols in brackets): Update test
+ group.
+ ($ or @ followed by . or -): Likewise.
+ * tests/regression.at (Invalid inputs): Likewise.
+
+2011-01-24 Joel E. Denny <joeldenny@joeldenny.org>
+
+ * data/yacc.c: Fix last apostrophe warning from xgettext.
+
+2011-01-09 Paul Eggert <eggert@cs.ucla.edu>
+
+ Fix minor problems encountered by a fresh bootstrap.
+ * data/glr.c, data/yacc.c: Do not use apostrophes in '#' comments,
+ as they confuse xgettext, which tries to parse them as C character
+ constants in a preprocessor directive.
+ * data/yacc.c (yy_lac): Don't use printf %d format on *yyesp, as
+ that expression might not promote to int on some platforms.
+ * src/parse-gram.c, src/parse-gram.h: Regenerate.
+
+2011-01-09 Joel E. Denny <joeldenny@joeldenny.org>
+
+ Improve error messages for `$' or `@' followed by `.' or `-'.
+ Previously, for this special case of an invalid reference, the
+ usual "symbol not found in production:" was printed. However,
+ because the symbol name was parsed as the empty string, that
+ message was followed immediately by a newline instead of a symbol
+ name. In reality, this is a syntax error, so the reference is
+ invalid regardless of the symbols actually appearing in the
+ production. Discussed at
+ <http://lists.gnu.org/archive/html/bison-patches/2011-01/msg00012.html>.
+ * src/scan-code.l (parse_ref): Report the above case as a syntax
+ error. Other than that, continue to handle this case like any
+ other invalid reference that Bison manages to parse because
+ "possibly meant" messages can still be helpful to the user.
+ * tests/named-refs.at ($ or @ followed by . or -): New test group.
+
+2011-01-08 Joel E. Denny <joeldenny@joeldenny.org>
+
+ doc: don't use @acronym.
+ Lately, many GNU packages are dropping it. See
+ <http://lists.gnu.org/archive/html/bison-patches/2011-01/msg00003.html>.
+ * doc/bison.texinfo: Remove all uses.
+
+2011-01-05 Alex Rozenman <rozenman@gmail.com>
+
+ Do not allow identifiers that start with a negative number.
+ Reported by Paul Hilfinger as a side effect of named references
+ support at
+ <http://lists.gnu.org/archive/html/bug-bison/2011-01/msg00000.html>.
+ Suggested by Paul Eggert.
+ * src/scan-code.l ({letter}, {id}): Adjust lexical definitions.
+ * src/scan-gram.l ({letter}, {id}): Likewise.
+
+2011-01-03 Joel E. Denny <joeldenny@joeldenny.org>
+
+ * ChangeLog (2011-01-02): improve description.
+
+2011-01-03 Joel E. Denny <joeldenny@joeldenny.org>
+
+ maint: don't update copyright years in bootstrap.
+ * .x-update-copyright: Add entry for bootstrap.
+ * bootstrap: Remove 2011 from copyright years. The bootstrap
+ version we're currently using comes from an older version of
+ gnulib.
+ * bootstrap.conf (bootstrap_sync): Add comments explaining this
+ issue.
+
+2011-01-02 Joel E. Denny <joeldenny@joeldenny.org>
+
+ maint: run "make update-copyright".
+
+2011-01-02 Joel E. Denny <joeldenny@joeldenny.org>
+
+ maint: prepare to use year ranges in copyright notices.
+ * README (Copyright statements): New section explaining the range
+ notation. The GNU maintainers document requires this explanation:
+ <http://www.gnu.org/prep/maintain/maintain.html#Copyright-Notices>.
+ I copied our explanation from coreutils.
+ * build-aux/update-b4-copyright: Revert 2010-06-17 changes that
+ disabled Bison's automated use of ranges.
+ * cfg.mk (update-copyright-env): Likewise.
+
+2011-01-02 Joel E. Denny <joeldenny@joeldenny.org>
+
+ Correct my email address.
+ * ChangeLog: In all recent entries.
+ * THANKS (Joel E. Denny): Here.
+
+2010-12-19 Joel E. Denny <joeldenny@joeldenny.org>
+
+ doc: cleanup.
+ * NEWS (2.5): Try to sort entries according to how interesting
+ users might find them.
+
+2010-12-19 Joel E. Denny <joeldenny@joeldenny.org>
+
+ doc: cleanup.
+ * NEWS (2.5): Make some minor improvements to wording, and format
+ entries more consistently.
+ * doc/bison.texinfo (Language and Grammar): Point out that IELR
+ and canonical LR are experimental features.
+ (Decl Summary): In list of %define variables, make wording more
+ consistent. Improve discussion of using LALR for GLR.
+
+2010-12-19 Joel E. Denny <joeldenny@joeldenny.org>
+
+ parse.lac: document.
+ * NEWS (2.5): Add entry for LAC, and mention LAC in entry for
+ other corrections to verbose syntax error messages.
+ * doc/bison.texinfo (Decl Summary): Rewrite entries for
+ lr.default-reductions and lr.type to be clearer, to mention
+ %nonassoc's effect on canonical LR, and to mention LAC. Add entry
+ for parse.lac.
+ (Glossary): Add entry for LAC.
+
+2010-12-11 Joel E. Denny <joeldenny@joeldenny.org>
+
+ parse.lac: implement exploratory stack reallocations.
+ * data/yacc.c: Rename %define variable parse.lac.es-capacity to
+ parse.lac.es-capacity-initial. Accept parse.lac.memory-trace
+ with values of "failures" (default) or "full".
+ (b4_declare_parser_state_variables): Add yyesa, yyes, and
+ yyes_capacity variables.
+ (YYSTACK_USE_ALLOCA): Ignore it if LAC requested.
+ (YYSTACK_ALLOC, YYSTACK_FREE, YYSTACK_ALLOC_MAXIMUM): Define if
+ LAC requested.
+ (YYCOPY_NEEDED): New cpp macro.
+ (YYCOPY): Define if LAC requested.
+ (yy_lac_stack_realloc): New function implementing stack
+ reallocations. Use YYMAXDEPTH for maximum stack size given that
+ the stack should never need to grow larger than the main state
+ stack needs to grow without LAC.
+ (YY_LAC_ESTABLISH): Update yy_lac invocation.
+ (yy_lac): Add arguments for exploratory stack memory data
+ recorded in the main parser. Invoke yy_lac_stack_realloc when
+ reallocation is necessary.
+ (yysyntax_error): Add the same new arguments and pass them to
+ yy_lac.
+ (yypstate_delete): Free yyes if necessary.
+ (yyesa, yyes, yyes_capacity): #define these to yypstate members
+ in the case of push parsing.
+ (yyparse, yypush_parse): Initialize yyes and yyes_capacity.
+ Update yysyntax_error invocations. At yyreturn, free yyes if
+ necessary.
+ * src/parse-gram.y: %define parse.lac full.
+ * tests/input.at (LAC: errors for %define): Extend for
+ parse.lac-memory-trace.
+ * tests/regression.at (LAC: Exploratory stack): Extend to check
+ that stack reallocs happen when expected.
+ (LAC: Memory exhaustion): Update to use YYMAXDEPTH and
+ parse.lac.es-capacity-initial.
+
+2010-12-11 Joel E. Denny <joeldenny@joeldenny.org>
+
+ parse.lac: implement as %define variable.
+ LAC = lookahead correction. See discussion at
+ <http://lists.gnu.org/archive/html/bison-patches/2009-09/msg00034.html>.
+ However, one point there must be corrected: because of %nonassoc,
+ LAC is *not* always redundant for lr.type=canonical-lr.
+ * data/yacc.c: Accept values of "none" (default) or "full" for
+ parse.lac. Accept %define parse.lac.es-capacity to specify
+ capacity of LAC's temporary exploratory stack. It defaults to 20
+ and, for now, will not grow dynamically.
+ (b4_lac_flag, b4_lac_if): New m4 macros. Evaluate as true for
+ parse.lac!=none.
+ (YYBACKUP): Invoke YY_LAC_DISCARD.
+ (YY_LAC_ESTABLISH, YY_LAC_DISCARD): New cpp macros that invoke
+ yy_lac and track when it needs to be invoked
+ (yy_lac): New function that, given the current stack, determines
+ whether a token can eventually be shifted. Return status mimics
+ yyparse return status.
+ (yysyntax_error): Change yystate argument to yyssp so stack top
+ can be passed to yy_lac. If LAC is requested, build expected
+ token list by invoking yy_lac for every token instead of just
+ checking the current state for lookaheads. Return 2 if yy_lac
+ exhausts memory.
+ (yyparse, yypush_parse): Use local variable yy_lac_established and
+ cpp macros YY_LAC_ESTABLISH and YY_LAC_DISCARD to implement LAC.
+ Update yysyntax_error invocation. Add yyexhaustedlab code if LAC
+ is requested.
+ * tests/conflicts.at (%nonassoc and eof): Extend to check the
+ effect of each of -Dlr.type=canonical-lr and -Dparse.lac=full.
+ (%error-verbose and consistent errors): Likewise.
+ (LAC: %nonassoc requires splitting canonical LR states): New test
+ group demonstrating how LAC can fix canonical LR.
+ * tests/input.at (LAC: Errors for %define): New test group.
+ * tests/regression.at (LAC: Exploratory stack): New test group.
+ (LAC: Memory exhaustion): New test group.
+
+2010-11-21 Joel E. Denny <joeldenny@joeldenny.org>
+
+ build: use gnulib's new bootstrap_sync option.
+ Now, whenever we update bison's copy of gnulib, bootstrap will
+ update itself the next time it's run.
+ * bootstrap: Copy from latest gnulib for bootstrap_sync support.
+ * bootstrap.conf (bootstrap_sync): Set to true.
+ * gnulib: Update to latest so bootstrap is in sync now.
+
+2010-11-07 Joel E. Denny <joeldenny@joeldenny.org>
+
+ yysyntax_error: adjust prior fixes for branch-2.5's lalr1.cc.
+ On master, there is no yychar in lalr1.cc, but there is on
+ branch-2.5, and the prior cherry-pick of "Fix handling of yychar
+ manipulation in user semantic actions" wasn't adjusted for that
+ difference.
+ * data/lalr1.cc (yy::parser::parse): Translate yychar before
+ every use of yytoken, and add comments explaining this approach.
+ * tests/conflicts.at (%error-verbose and consistent errors):
+ Extend to test yychar manipulation with lalr1.cc.
+
+2010-11-07 Joel E. Denny <joeldenny@joeldenny.org>
+
+ yysyntax_error: fix for consistent error with lookahead.
+ * NEWS (2.5): Document.
+ * data/yacc.c (yysyntax_error): In a verbose syntax error
+ message while in a consistent state with a default action (which
+ must be an error action given that yysyntax_error is being
+ invoked), continue to drop the expected token list, but don't
+ drop the unexpected token unless there actually is no lookahead.
+ Moreover, handle that internally instead of returning 1 to tell
+ the caller to do it. With that meaning of 1 gone, renumber
+ return codes more usefully.
+ (yyparse, yypush_parse): Update yysyntax_error usage. Most
+ importantly, set yytoken to YYEMPTY when there's no lookahead.
+ * data/glr.c (yyreportSyntaxError): As in yacc.c, don't drop the
+ unexpected token unless there actually is no lookahead.
+ * data/lalr1.cc (yy::parser::parse): If there's no lookahead,
+ set yytoken to yyempty_ before invoking yysyntax_error_.
+ (yy::parser::yysyntax_error_): Again, don't drop the unexpected
+ token unless there actually is no lookahead.
+ * data/lalr1.java (YYParser::parse): If there's no lookahead,
+ set yytoken to yyempty_ before invoking yysyntax_error.
+ (YYParser::yysyntax_error): Again, don't drop the unexpected
+ token unless there actually is no lookahead.
+ * tests/conflicts.at (%error-verbose and consistent
+ errors): Extend test group to further reveal how the previous
+ use of the simple "syntax error" message was too general. Test
+ yacc.c, glr.c, lalr1.cc, and lalr1.java. No longer an expected
+ failure.
+ * tests/java.at (AT_JAVA_COMPILE, AT_JAVA_PARSER_CHECK): Move
+ to...
+ * tests/local.at: ... here.
+ (_AT_BISON_OPTION_PUSHDEFS): Push AT_SKEL_JAVA_IF definition.
+ (AT_BISON_OPTION_POPDEFS): Pop it.
+ (AT_FULL_COMPILE): Extend to handle Java.
+
+2010-11-07 Joel E. Denny <joeldenny@joeldenny.org>
+
+ yysyntax_error: more preparation for readability of next patch.
+ There are no behavioral changes here.
+ * data/glr.c (yyreportSyntaxError): Reorganize.
+ * data/lalr1.cc (yy::parser::yysyntax_error_): Reorganize.
+ * tests/conflicts.at (%error-verbose and consistent errors):
+ Reorganize.
+
+2010-11-07 Joel E. Denny <joeldenny@joeldenny.org>
+
+ yysyntax_error: prepare for readability of next patches.
+ These are purely whitespace changes that result in ugly code
+ but that make the next couple of patches much easier to read.
+ * data/glr.c (yyreportSyntaxError): Reindent.
+ * data/lalr1.cc (yy::parser::yysyntax_error_): Reindent.
+ * data/lalr1.java (YYParser::yysyntax_error): Reindent.
+ * data/yacc.c (yysyntax_error): Reindent.
+
2010-10-31 Joel E. Denny <joeldenny@joeldenny.org>
yysyntax_error: improve invocation readability.
-----
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