X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/f6b561d9f9cbc6fc95bbb86518372a5cb52f45a6..c6b1772473d0a26faa22464df98718d0d0ae2e2e:/NEWS diff --git a/NEWS b/NEWS index d3a860b5..c8cab5e0 100644 --- a/NEWS +++ b/NEWS @@ -16,11 +16,11 @@ GNU Bison NEWS *** Enhancements of the -Werror option The -Werror=CATEGORY option is now recognized, and will treat specified - warnings as errors. The warnings need not have been explictly activated - using the -W option, this is similar to what gcc 4.7 does. + warnings as errors. The warnings need not have been explicitly activated + using the -W option, this is similar to what GCC 4.7 does. For example, given the following command line, Bison will treat both - warnings related to POSIX Yacc incompatiblities and S/R conflicts as + warnings related to POSIX Yacc incompatibilities and S/R conflicts as errors (and only those): $ bison -Werror=yacc,error=conflicts-sr input.y @@ -47,7 +47,7 @@ GNU Bison NEWS In the case of warnings treated as errors, the prefix is changed from "warning: " to "error: ", and the suffix is displayed, in a manner similar - to gcc, as [-Werror=CATEGORY]. + to GCC, as [-Werror=CATEGORY]. For instance, where the previous version of Bison would report (and exit with failure): @@ -195,14 +195,14 @@ GNU Bison NEWS used by the scanner, or rejecting invalid combinations from a factory invoked by the user actions). -** Variable api.tokens.prefix +** Variable api.token.prefix - The variable api.tokens.prefix changes the way tokens are identified in + The variable api.token.prefix changes the way tokens are identified in the generated files. This is especially useful to avoid collisions with identifiers in the target language. For instance %token FILE for ERROR - %define api.tokens.prefix "TOK_" + %define api.token.prefix "TOK_" %% start: FILE for ERROR; @@ -211,11 +211,15 @@ GNU Bison NEWS use these prefixed token names, although the grammar itself still uses the short names (as in the sample rule given above). -** Variable api.namespace +** Renamed %define variables - The 'namespace' variable is renamed 'api.namespace'. Backward + The following variables have been renamed for consistency. Backward compatibility is ensured, but upgrading is recommended. + lr.default-reductions -> lr.default-reduction + lr.keep-unreachable-states -> lr.keep-unreachable-state + namespace -> api.namespace + ** Variable parse.error This variable controls the verbosity of error messages. The use of the @@ -238,6 +242,96 @@ GNU Bison NEWS * Noteworthy changes in release ?.? (????-??-??) [?] +** Changes in the format of error messages + + This used to be the format of many error reports: + + foo.y:5.10-24: result type clash on merge function 'merge': != + foo.y:4.13-27: previous declaration + + It is now: + + foo.y:5.10-25: result type clash on merge function 'merge': != + foo.y:4.13-27: previous declaration + +** 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. + +** 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. + +** Graph improvements in DOT and XSLT + + 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. + + These changes are present in both --graph output and xml2dot.xsl XSLT + processing, with minor (documented) differences. + + Two nodes were added to the documentation: Xml and Graphviz. + +* Noteworthy changes in release ?.? (????-??-??) [?] + +** Bug fixes + + Warnings about uninitialized yylloc in yyparse have been fixed. + +** Documentation + + The sections about shift/reduce and reduce/reduce conflicts resolution + have been fixed and extended. + +* Noteworthy changes in release 2.6.5 (2012-11-07) [stable] + + We consider compiler warnings about Bison generated parsers to be bugs. + Rather than working around them in your own project, please consider + reporting them to us. + +** Bug fixes + + Warnings about uninitialized yylval and/or yylloc for push parsers with a + pure interface have been fixed for GCC 4.0 up to 4.8, and Clang 2.9 to + 3.2. + + Other issues in the test suite have been addressed. + + Nul characters are correctly displayed in error messages. + + When possible, yylloc is correctly initialized before calling yylex. It + is no longer necessary to initialize it in the %initial-action. + +* Noteworthy changes in release 2.6.4 (2012-10-23) [stable] + + Bison 2.6.3's --version was incorrect. This release fixes this issue. + +* Noteworthy changes in release 2.6.3 (2012-10-22) [stable] + ** Bug fixes Bugs and portability issues in the test suite have been fixed. @@ -252,18 +346,6 @@ GNU Bison NEWS All the generated headers are self-contained. -** Changes in the format of error messages - - This used to be the format of many error reports: - - foo.y:5.10-24: result type clash on merge function 'merge': != - foo.y:4.13-27: previous declaration - - It is now: - - foo.y:5.10-25: result type clash on merge function 'merge': != - 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 @@ -275,15 +357,6 @@ GNU Bison NEWS 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 rethrowing 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 @@ -301,21 +374,6 @@ GNU Bison NEWS "function declared 'noreturn' should not return") have also been addressed. -** New %define variable: api.location.type (glr.cc, lalr1.cc) - - 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). - * Noteworthy changes in release 2.6.2 (2012-08-03) [stable] ** Bug fixes @@ -372,7 +430,7 @@ GNU Bison NEWS * Noteworthy changes in release 2.6 (2012-07-19) [stable] -** Future changes: +** Future changes The next major release of Bison will drop support for the following deprecated features. Please report disagreements to bug-bison@gnu.org. @@ -2174,7 +2232,7 @@ along with this program. If not, see . 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 Wother nterm arg init - LocalWords: TOK calc yyo fval + LocalWords: TOK calc yyo fval Wconflicts Local Variables: mode: outline