X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/133c20e252422fd2f844ef2ea136d6a59281ed7b..02097d3eab1dbc4d7763210a37ffec517288928e:/NEWS diff --git a/NEWS b/NEWS index e02a9797..8eeef044 100644 --- a/NEWS +++ b/NEWS @@ -1,13 +1,18 @@ Bison News ---------- -Changes in version 1.49a: +Changes in version 1.49b: + +* Output Directory + When not in Yacc compatibility mode, when the output file was not + specified, runnning `bison foo/bar.y' created `foo/bar.c'. It + now creates `bar.c'. * Undefined token The undefined token was systematically mapped to 2 which prevented the use of 2 from the user. This is no longer the case. -* Undefined token +* Unknown token numbers If yylex returned a code out of range, yyparse could die. This is no longer the case. @@ -17,20 +22,35 @@ Changes in version 1.49a: user specified that one of her tokens is numbered 256, then error will be mapped onto another number. +* Error recovery now conforms to documentation and to POSIX + When a Bison-generated parser encounters a syntax error, it now pops + the stack until it finds a state that allows shifting the error + token. Formerly, it popped the stack until it found a state that + allowed some non-error action other than a default reduction on the + error token. The new behavior has long been the documented behavior, + and has long been required by POSIX. For more details, please see + . + +* Traces + Popped tokens and nonterminals are now reported. + * Large grammars - Are now supported (large token numbers, large grammar size (= sum of - the LHS and RHS lengths), large LALR tables). + Large grammars are now supported (large token numbers, large grammar + size (= sum of the LHS and RHS lengths), large LALR tables). -* The initial rule is explicit. +* Explicit initial rule Bison used to play hacks with the initial rule, which the user does not write. It is now explicit, and visible in the reports and graphs as rule 0. -* Useless rules are actually removed. +* Useless rules Before, Bison reported the useless rules, but, although not used, - included them in the parsers. + included them in the parsers. They are now actually removed. + +* Useless rules, useless nonterminals + They are now reported, as a warning, with their locations. -* False `Token not used' report fixed. +* Incorrect `Token not used' On a grammar such as %token useless useful @@ -40,12 +60,14 @@ Changes in version 1.49a: where a token was used to set the precedence of the last rule, bison reported both `useful' and `useless' as useless tokens. -* Revert the C++ namespace changes introduced in 1.31, as they caused too - many portability hassles. +* Revert the C++ namespace changes introduced in 1.31 + as they caused too many portability hassles. -* Items overflow - Bison no longer dumps core when there are too many items, it just - dies. +* Default locations + By an accident of design, the default computation of @$ was + performed after another default computation was performed: @$ = @1. + The latter is now removed: YYLLOC_DEFAULT is fully responsible of + the computation of @$. * Token end-of-file The token end of file may be specified by the user, in which case, @@ -55,6 +77,95 @@ Changes in version 1.49a: %token YYEOF 0 or %token YYEOF 0 "end of file" + +* Semantic parser + This old option, which has been broken for ages, is removed. + +* New translation + Croatian, thanks to Denis Lackovic. + +* Incorrect token definitions + When fed with `%token 'a' "A"', Bison used to output `#define 'a' 65'. + +* Token definitions as enums + Tokens are output both as the traditional #define's, and, provided + the compiler supports ANSI C or is a C++ compiler, as enums. + This helps debuggers producing symbols instead of values. + +* Reports + In addition to --verbose, bison supports --report=THINGS, which + produces additional information: + - itemset + complete the core item sets with their closure + - lookahead + explicitly associate lookaheads to items + - solved + describe shift/reduce conflicts solving. + Bison used to systematically output this information on top of + the report. Solved conflicts are now attached to their states. + +* Type clashes + Previous versions don't complain when there is a type clash on + the default action if the rule has a mid-rule action, such as in: + + %type bar + %% + bar: '0' {} '0'; + + This is fixed. + +Changes in version 1.35, 2002-03-25: + +* C Skeleton + Some projects use Bison's C parser with C++ compilers, and define + YYSTYPE as a class. The recent adjustment of C parsers for data + alignment and 64 bit architectures made this impossible. + + Because for the time being no real solution for C++ parser + generation exists, kludges were implemented in the parser to + maintain this use. In the future, when Bison has C++ parsers, this + kludge will be disabled. + + This kludge also addresses some C++ problems when the stack was + extended. + + +Changes in version 1.34, 2002-03-12: + +* File name clashes are detected + $ bison foo.y -d -o foo.x + fatal error: header and parser would both be named `foo.x' + +* A missing `;' at the end of a rule triggers a warning + In accordance with POSIX, and in agreement with other + Yacc implementations, Bison will mandate this semicolon in the near + future. This eases the implementation of a Bison parser of Bison + grammars by making this grammar LALR(1) instead of LR(2). To + facilitate the transition, this release introduces a warning. + +* Revert the C++ namespace changes introduced in 1.31, as they caused too + many portability hassles. + +* DJGPP support added. + +* Fix test suite portability problems. + +Changes in version 1.33, 2002-02-07: + +* Fix C++ issues + Groff could not be compiled for the definition of size_t was lacking + under some conditions. + +* Catch invalid @n + As is done with $n. + +Changes in version 1.32, 2002-01-23: + +* Fix Yacc output file names + +* Portability fixes + +* Italian, Dutch translations Changes in version 1.31, 2002-01-14: @@ -83,6 +194,7 @@ Changes in version 1.31, 2002-01-14: * Better C++ compliance The output parsers try to respect C++ namespaces. + [This turned out to be a failed experiment, and it was reverted later.] * Reduced Grammars Fixed bugs when reporting useless nonterminals. @@ -140,7 +252,7 @@ Changes in version 1.31, 2002-01-14: * --output New, aliasing `--output-file'. -Changes in version 1.30: +Changes in version 1.30, 2001-10-26: * `--defines' and `--graph' have now an optionnal argument which is the output file name. `-d' and `-g' do not change, they do not take any @@ -263,3 +375,24 @@ Output file does not redefine const for C++. Local Variables: mode: outline End: + +----- + +Copyright (C) 2001, 2002 Free Software Foundation, Inc. + +This file is part of GNU Autoconf. + +GNU Autoconf is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Autoconf is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with autoconf; see the file COPYING. If not, write to +the Free Software Foundation, Inc., 59 Temple Place - Suite 330, +Boston, MA 02111-1307, USA.