X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/cbaea0106d2c70e45ddb5fa6d662d31c9bb3d4f8..a029e56f5cf707378aa48cd783001d814dda6c9d:/NEWS diff --git a/NEWS b/NEWS index 772a2d51..d1b66564 100644 --- a/NEWS +++ b/NEWS @@ -4,7 +4,7 @@ GNU Bison NEWS ** Bug fixes - Bugs in the test suite have been fixed. + Bugs and portability issues in the test suite have been fixed. Some errors in translations have been addressed, and --help now directs users to the appropriate place to report them. @@ -14,7 +14,9 @@ GNU Bison NEWS Incorrect definitions of YY_, issued by yacc.c when no parser header is generated, are removed. -** Changes in the format of errors and exceptions output + All the generated headers are self-contained. + +** Changes in the format of error messages This used to be the format of many error reports: @@ -26,6 +28,71 @@ GNU Bison NEWS foo.y:5.10-25: result type clash on merge function 'merge': <t3> != <t2> foo.y:4.13-27: previous declaration +** Header guards (yacc.c, glr.c, glr.cc) + + In order to avoid collisions, the header guards are now + YY_<PREFIX>_<FILE>_INCLUDED, instead of merely <PREFIX>_<FILE>. + For instance the header generated from + + %define api.prefix "calc" + %defines "lib/parse.h" + + will use YY_CALC_LIB_PARSE_H_INCLUDED as guard. + +** Exception safety (lalr1.cc) + + The parse function now catches exceptions, uses the %destructors to + release memory (the lookahead symbol and the symbols pushed on the stack) + before re-throwing the exception. + + This feature is somewhat experimental. User feedback would be + appreciated. + +** Fix compiler warnings in the generated parser (yacc.c, glr.c) + + The compilation of pure parsers (%define api.pure) can trigger GCC + warnings such as: + + input.c: In function 'yyparse': + input.c:1503:12: warning: 'yylval' may be used uninitialized in this + function [-Wmaybe-uninitialized] + *++yyvsp = yylval; + ^ + + This is now fixed; pragmas to avoid these warnings are no longer needed. + + Warnings from clang ("equality comparison with extraneous parentheses" and + "function declared 'noreturn' should not return") have also been + addressed. + +** New %define variable: api.location.type (glr.cc, lalr1.cc, lalr1.java) + + The %define variable api.location.type defines the name of the type to use + for locations. When defined, Bison no longer generates the position.hh + and location.hh files, nor does the parser will include them: the user is + then responsible to define her type. + + This can be used in programs with several parsers to factor their location + and position files: let one of them generate them, and the others just use + them. + + This feature was actually introduced, but not documented, in Bison 2.5, + under the name "location_type" (which is maintained for backward + compatibility). + + For consistency, lalr1.java's %define variables location_type and + position_type are deprecated in favor of api.location.type and + api.position.type. + +** Graphviz improvements + + The graphical presentation of the states is more readable: their shape is + now rectangular, the state number is clearly displayed, and the items are + numbered and left-justified. + + The reductions are now explicitly represented as transitions to other + diamond shaped nodes. + * Noteworthy changes in release 2.6.2 (2012-08-03) [stable] ** Bug fixes @@ -1883,7 +1950,8 @@ along with this program. If not, see <http://www.gnu.org/licenses/>. LocalWords: namespaces strerror const autoconfiguration Dconst Autoconf's FDL LocalWords: Automake TMPDIR LESSEQ ylwrap endif yydebug YYTOKEN YYLSP ival hh LocalWords: extern YYTOKENTYPE TOKENTYPE yytokentype tokentype STYPE lval pdf - LocalWords: lang yyoutput dvi html ps POSIX lvalp llocp + LocalWords: lang yyoutput dvi html ps POSIX lvalp llocp calc yyo fval Wmaybe + LocalWords: yyvsp pragmas noreturn java's Local Variables: mode: outline