X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/a861a3390f8fe43e8ebed91c177329184fa6aa8b..2f82502a6fc07c455cbbfa94e75c5febf930d1c9:/NEWS diff --git a/NEWS b/NEWS index 51836800..554f32ca 100644 --- a/NEWS +++ b/NEWS @@ -1,7 +1,87 @@ Bison News ---------- +Changes in version 1.75c: -Changes in version 1.49b, 2002-08-12: +* "parse error" -> "syntax error" + Bison now uniformly uses the term "syntax error"; formerly, the code + and manual sometimes used the term "parse error" instead. POSIX + requires "syntax error" in diagnostics, and it was thought better to + be consistent. + +* "parsing stack overflow..." -> "parser stack overflow" + GLR parsers now report "parser stack overflow" as per the Bison manual. + +* GLR and inline + Users of Bison have to decide how they handle the portability of the + C keyword `inline'. + +Changes in version 1.75b, 2002-11-13: + +* %destructor + It is now possible to reclaim the memory associated to symbols + discarded during error recovery. This feature is still experimental. + +* Bison now parses C99 lexical constructs like UCNs and + backslash-newline within C escape sequences, as POSIX 1003.1-2001 requires. + +* --no-line works properly. + +* %error-verbose + This new directive is preferred over YYERROR_VERBOSE. + +* %lex-param, %parse-param + These new directives are preferred over PARSE_PARAM and LEX_PARAM. + In addition, they provide a means for yyerror to remain pure, and + to access to the current location. + + #defining yyerror to steal internal variables is strongly + discouraged. It is not guaranteed to work for ever. + +* #line + Bison now recognizes #line in its input, and forwards them. + +* #line + File names are properly escaped. E.g. foo\bar.y give #line 123 "foo\\bar.y". + +Changes in version 1.75a, 2002-10-24: + +* Bison can no longer be built by a K&R C compiler; it requires C89 or + later to be built. This change originally took place a few versions + ago, but nobody noticed until we recently asked someone to try + building Bison with a K&R C compiler. + +Changes in version 1.75, 2002-10-14: + +* Bison should now work on 64-bit hosts. + +* Indonesian translation thanks to Tedi Heriyanto. + +* GLR parsers + Fix spurious parse errors. + +* Pure parsers + Some people redefine yyerror to steal yyparse' private variables. + Reenable this trick until an official feature replaces it. + +* Type Clashes + In agreement with POSIX and with other Yaccs, leaving a default + action is valid when $$ is untyped, and $1 typed: + + untyped: ... typed; + + but the converse remains an error: + + typed: ... untyped; + +* Values of mid-rule actions + The following code: + + foo: { ... } { $$ = $1; } ... + + was incorrectly rejected: $1 is defined in the second mid-rule + action, and is equal to the $$ of the first mid-rule action. + +Changes in version 1.50, 2002-10-04: * GLR parsing The declaration @@ -11,27 +91,30 @@ Changes in version 1.49b, 2002-08-12: %dprec and %merge on grammar rules allow parse-time resolution of ambiguities. Contributed by Paul Hilfinger. + Unfortunately Bison 1.50 does not work properly on 64-bit hosts + like the Alpha, so please stick to 32-bit hosts for now. + * 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 + specified, running `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. + the use of 2 by the user. This is no longer the case. * Unknown token numbers - If yylex returned a code out of range, yyparse could die. This is + If yylex returned an out of range value, yyparse could die. This is no longer the case. * Error token - According to POSIX, the error token should be numbered as 256. + According to POSIX, the error token must be 256. Bison extends this requirement by making it a preference: *if* the user specified that one of her tokens is numbered 256, then error will be mapped onto another number. * Verbose error messages - They no longer report `..., expecting error or...' for state where + They no longer report `..., expecting error or...' for states where error recovery is possible. * End token @@ -95,9 +178,9 @@ Changes in version 1.49b, 2002-08-12: the user symbol is used in the reports, the graphs, and the verbose error messages instead of `$end', which remains being the default. For instance - %token YYEOF 0 + %token MYEOF 0 or - %token YYEOF 0 "end of file" + %token MYEOF 0 "end of file" * Semantic parser This old option, which has been broken for ages, is removed. @@ -107,12 +190,12 @@ Changes in version 1.49b, 2002-08-12: Croatian, thanks to Denis Lackovic. * Incorrect token definitions - When fed with `%token 'a' "A"', Bison used to output `#define 'a' 65'. + When given `%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. + This lets debuggers display names instead of integers. * Reports In addition to --verbose, bison supports --report=THINGS, which @@ -152,7 +235,6 @@ Changes in version 1.35, 2002-03-25: This kludge also addresses some C++ problems when the stack was extended. - Changes in version 1.34, 2002-03-12: @@ -278,8 +360,8 @@ Changes in version 1.31, 2002-01-14: 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 +* `--defines' and `--graph' have now an optional argument which is the + output file name. `-d' and `-g' do not change; they do not take any argument. * `%source_extension' and `%header_extension' are removed, failed