X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/258cddbc3695f2095cbfbc9ff95309b28733f7d2..0e1ccdfae04efce6a1122ad9c4b0e85d9625c0bc:/NEWS diff --git a/NEWS b/NEWS index 7eebe910..37b8e2c0 100644 --- a/NEWS +++ b/NEWS @@ -2,15 +2,133 @@ GNU Bison NEWS * Noteworthy changes in release ?.? (????-??-??) [?] -** Future changes + 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. + +* 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. + + Some errors in translations have been addressed, and --help now directs + users to the appropriate place to report them. + + Stray Info files shipped by accident are removed. + + Incorrect definitions of YY_, issued by yacc.c when no parser header is + generated, are removed. + + All the generated headers are self-contained. + +** Header guards (yacc.c, glr.c, glr.cc) + + In order to avoid collisions, the header guards are now + YY___INCLUDED, instead of merely _. + For instance the header generated from + + %define api.prefix "calc" + %defines "lib/parse.h" + + will use YY_CALC_LIB_PARSE_H_INCLUDED as guard. + +** 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. + +* Noteworthy changes in release 2.6.2 (2012-08-03) [stable] + +** Bug fixes + + Buffer overruns, complaints from Flex, and portability issues in the test + suite have been fixed. + +** Spaces in %lex- and %parse-param (lalr1.cc, glr.cc) + + Trailing end-of-lines in %parse-param or %lex-param would result in + invalid C++. This is fixed. + +** Spurious spaces and end-of-lines + + The generated files no longer end (nor start) with empty lines. + +* Noteworthy changes in release 2.6.1 (2012-07-30) [stable] + + Bison no longer executes user-specified M4 code when processing a grammar. + +** Future Changes + + In addition to the removal of the features announced in Bison 2.6, the + next major release will remove the "Temporary hack for adding a semicolon + to the user action", as announced in the release 2.5. Instead of: + + exp: exp "+" exp { $$ = $1 + $3 }; + + write: + + exp: exp "+" exp { $$ = $1 + $3; }; + +** Bug fixes + +*** Type names are now properly escaped. + +*** glr.cc: set_debug_level and debug_level work as expected. + +*** Stray @ or $ in actions + + While Bison used to warn about stray $ or @ in action rules, it did not + for other actions such as printers, destructors, or initial actions. It + now does. + +** Type names in actions + + For consistency with rule actions, it is now possible to qualify $$ by a + type-name in destructors, printers, and initial actions. For instance: + + %printer { fprintf (yyo, "(%d, %f)", $$, $$); } <*> <>; + + will display two values for each typed and untyped symbol (provided + that YYSTYPE has both "ival" and "fval" fields). + +* Noteworthy changes in release 2.6 (2012-07-19) [stable] + +** Future Changes The next major release of Bison will drop support for the following deprecated features. Please report disagreements to bug-bison@gnu.org. -*** K&C parsers +*** K&R C parsers Support for generating parsers in K&R C will be removed. Parsers - generated for C supprt ISO C90, and are tested with ISO C99 and ISO C11 + generated for C support ISO C90, and are tested with ISO C99 and ISO C11 compilers. *** Features deprecated since Bison 1.875 @@ -32,12 +150,12 @@ GNU Bison NEWS because existing versions of ylwrap (e.g., Automake 1.12.1) do not support it. -** Headers +** Generated Parser Headers *** Guards (yacc.c, glr.c, glr.cc) The generated headers are now guarded, as is already the case for C++ - parsers (lalr1.cc). For intance, with --defines=foo.h: + parsers (lalr1.cc). For instance, with --defines=foo.h: #ifndef YY_FOO_H # define YY_FOO_H @@ -65,6 +183,74 @@ GNU Bison NEWS header, are removed, as they prevent the possibility of including several generated headers from a single compilation unit. +*** YYLSP_NEEDED + + For the same reasons, the undocumented and unused macro YYLSP_NEEDED is no + longer defined. + +** New %define variable: api.prefix + + Now that the generated headers are more complete and properly protected + against multiple inclusions, constant names, such as YYSTYPE are a + problem. While yyparse and others are properly renamed by %name-prefix, + YYSTYPE, YYDEBUG and others have never been affected by it. Because it + would introduce backward compatibility issues in projects not expecting + YYSTYPE to be renamed, instead of changing the behavior of %name-prefix, + it is deprecated in favor of a new %define variable: api.prefix. + + The following examples compares both: + + %name-prefix "bar_" | %define api.prefix "bar_" + %token FOO %token FOO + %union { int ival; } %union { int ival; } + %% %% + exp: 'a'; exp: 'a'; + + bison generates: + + #ifndef BAR_FOO_H #ifndef BAR_FOO_H + # define BAR_FOO_H # define BAR_FOO_H + + /* Enabling traces. */ /* Enabling traces. */ + # ifndef YYDEBUG | # ifndef BAR_DEBUG + > # if defined YYDEBUG + > # if YYDEBUG + > # define BAR_DEBUG 1 + > # else + > # define BAR_DEBUG 0 + > # endif + > # else + # define YYDEBUG 0 | # define BAR_DEBUG 0 + > # endif + # endif | # endif + + # if YYDEBUG | # if BAR_DEBUG + extern int bar_debug; extern int bar_debug; + # endif # endif + + /* Tokens. */ /* Tokens. */ + # ifndef YYTOKENTYPE | # ifndef BAR_TOKENTYPE + # define YYTOKENTYPE | # define BAR_TOKENTYPE + enum yytokentype { | enum bar_tokentype { + FOO = 258 FOO = 258 + }; }; + # endif # endif + + #if ! defined YYSTYPE \ | #if ! defined BAR_STYPE \ + && ! defined YYSTYPE_IS_DECLARED | && ! defined BAR_STYPE_IS_DECLARED + typedef union YYSTYPE | typedef union BAR_STYPE + { { + int ival; int ival; + } YYSTYPE; | } BAR_STYPE; + # define YYSTYPE_IS_DECLARED 1 | # define BAR_STYPE_IS_DECLARED 1 + #endif #endif + + extern YYSTYPE bar_lval; | extern BAR_STYPE bar_lval; + + int bar_parse (void); int bar_parse (void); + + #endif /* !BAR_FOO_H */ #endif /* !BAR_FOO_H */ + * Noteworthy changes in release 2.5.1 (2012-06-05) [stable] ** Future changes: @@ -1233,7 +1419,7 @@ GNU Bison NEWS - a single argument only can be added, - their types are weak (void *), - - this context is not passed to anciliary functions such as yyerror, + - this context is not passed to ancillary functions such as yyerror, - only yacc.c parsers support them. The new %parse-param/%lex-param directives provide a more precise control. @@ -1731,9 +1917,11 @@ along with this program. If not, see . LocalWords: struct yystype DJGPP lex param Haible NUM alloca YYSTACK NUL goto LocalWords: YYMAXDEPTH Unescaped UCNs YYLTYPE's yyltype typedefs inline Yaccs LocalWords: Heriyanto Reenable dprec Hilfinger Eggert MYEOF Folle Menezes EOF - LocalWords: Lackovic define's itemset Groff Gettext malloc NEWS'ed YYDEBUG + LocalWords: Lackovic define's itemset Groff Gettext malloc NEWS'ed YYDEBUG YY LocalWords: namespaces strerror const autoconfiguration Dconst Autoconf's FDL - LocalWords: Automake TMPDIR LESSEQ + 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 calc yyo fval Local Variables: mode: outline