version 2.7.1

[bison.git] / NEWS

diff --git a/NEWS b/NEWS
index 2cd57c2802933c0d268b31f3ade19b52496ec20a..d445ce7e2dd877b6a28ff9e12e2260dd323ac9ef 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -1,38 +1,79 @@
 GNU Bison NEWS
 
 GNU Bison NEWS
 

-* Noteworthy changes in release ?.? (????-??-??) [?]
+* Noteworthy changes in release 2.7.1 (2013-04-15) [stable]

 
 

-** New value for %define variable: api.pure full
+** Bug fixes

 
 

-  The %define variable api.pure requests a pure (reentrant) parser. However,
-  for historical reasons, using it in a location-tracking Yacc parser resulted
-  in an yyerror function that did not take a location as a parameter. With this
-  new value, the user may request a better pure parser, where yyerror does take
-  a location as a parameter (in location-tracking parsers).
+*** Fix compiler attribute portability (yacc.c)

 
 

-  The use of "%define api.pure true" is deprecated in favor of this new
-  "%define api.pure full".
+  With locations enabled, __attribute__ was used unprotected.
+
+*** Fix some compiler warnings (lalr1.cc)
+
+* Noteworthy changes in release 2.7 (2012-12-12) [stable]
+
+** Bug fixes
+
+  Warnings about uninitialized yylloc in yyparse have been fixed.

 
 

-** Changes in the format of error messages
+  Restored C90 compliance (yet no report was ever made).
+
+** Diagnostics are improved
+
+*** Changes in the format of error messages

 
   This used to be the format of many error reports:
 
 
   This used to be the format of many error reports:
 

-    foo.y:5.10-24: result type clash on merge function 'merge': <t3> != <t2>
-    foo.y:4.13-27: previous declaration
+    input.y:2.7-12: %type redeclaration for exp
+    input.y:1.7-12: previous declaration

 
   It is now:
 
 
   It is now:
 

-    foo.y:5.10-25: result type clash on merge function 'merge': <t3> != <t2>
-    foo.y:4.13-27:     previous declaration
+    input.y:2.7-12: error: %type redeclaration for exp
+    input.y:1.7-12:     previous declaration

 
 

-** Exception safety (lalr1.cc)
+*** New format for error reports: carets

 
 

-  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.
+  Caret errors have been added to Bison:

 
 

-  This feature is somewhat experimental.  User feedback would be
-  appreciated.
+    input.y:2.7-12: error: %type redeclaration for exp
+     %type <sval> exp
+           ^^^^^^
+    input.y:1.7-12:     previous declaration
+     %type <ival> exp
+           ^^^^^^
+
+  or
+
+    input.y:3.20-23: error: ambiguous reference: '$exp'
+     exp: exp '+' exp { $exp = $1 + $3; };
+                        ^^^^
+    input.y:3.1-3:       refers to: $exp at $$
+     exp: exp '+' exp { $exp = $1 + $3; };
+     ^^^
+    input.y:3.6-8:       refers to: $exp at $1
+     exp: exp '+' exp { $exp = $1 + $3; };
+          ^^^
+    input.y:3.14-16:     refers to: $exp at $3
+     exp: exp '+' exp { $exp = $1 + $3; };
+                  ^^^
+
+  The default behaviour for now is still not to display these unless
+  explictly asked with -fcaret (or -fall). However, in a later release, it
+  will be made the default behavior (but may still be deactivated with
+  -fno-caret).
+
+** New value for %define variable: api.pure full
+
+  The %define variable api.pure requests a pure (reentrant) parser. However,
+  for historical reasons, using it in a location-tracking Yacc parser
+  resulted in a yyerror function that did not take a location as a
+  parameter. With this new value, the user may request a better pure parser,
+  where yyerror does take a location as a parameter (in location-tracking
+  parsers).
+
+  The use of "%define api.pure true" is deprecated in favor of this new
+  "%define api.pure full".

 
 ** New %define variable: api.location.type (glr.cc, lalr1.cc, lalr1.java)
 
 
 ** New %define variable: api.location.type (glr.cc, lalr1.cc, lalr1.java)
 


@@ -53,6 +94,15 @@ GNU Bison NEWS
   position_type are deprecated in favor of api.location.type and
   api.position.type.
 
   position_type are deprecated in favor of api.location.type and
   api.position.type.
 

+** 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.
+

 ** Graph improvements in DOT and XSLT
 
   The graphical presentation of the states is more readable: their shape is
 ** Graph improvements in DOT and XSLT
 
   The graphical presentation of the states is more readable: their shape is


@@ -65,19 +115,21 @@ GNU Bison NEWS
   These changes are present in both --graph output and xml2dot.xsl XSLT
   processing, with minor (documented) differences.
 
   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.
+** %language is no longer an experimental feature.

 
 

-* Noteworthy changes in release ?.? (????-??-??) [?]
-
-** Bug fixes
-
-  Warnings about uninitialized yylloc in yyparse have been fixed.
+  The introduction of this feature, in 2.4, was four years ago. The
+  --language option and the %language directive are no longer experimental.

 
 ** Documentation
 
   The sections about shift/reduce and reduce/reduce conflicts resolution
   have been fixed and extended.
 
 
 ** Documentation
 
   The sections about shift/reduce and reduce/reduce conflicts resolution
   have been fixed and extended.
 

+  Although introduced more than four years ago, XML and Graphviz reports
+  were not properly documented.
+
+  The translation of mid-rule actions is now described.
+

 * Noteworthy changes in release 2.6.5 (2012-11-07) [stable]
 
   We consider compiler warnings about Bison generated parsers to be bugs.
 * Noteworthy changes in release 2.6.5 (2012-11-07) [stable]
 
   We consider compiler warnings about Bison generated parsers to be bugs.


@@ -463,6 +515,7 @@ GNU Bison NEWS
 
   These features are experimental in this version.  More user feedback
   will help to stabilize them.
 
   These features are experimental in this version.  More user feedback
   will help to stabilize them.

+  Contributed by Alex Rozenman.

 
 ** IELR(1) and canonical LR(1):
 
 
 ** IELR(1) and canonical LR(1):
 


@@ -979,6 +1032,7 @@ GNU Bison NEWS
 
   The current Java interface is experimental and may evolve.  More user
   feedback will help to stabilize it.
 
   The current Java interface is experimental and may evolve.  More user
   feedback will help to stabilize it.

+  Contributed by Paolo Bonzini.

 
 ** %language
 
 
 ** %language
 


@@ -992,6 +1046,7 @@ GNU Bison NEWS
   Bison can now generate an XML report of the LALR(1) automaton using the new
   "--xml" option.  The current XML schema is experimental and may evolve.  More
   user feedback will help to stabilize it.
   Bison can now generate an XML report of the LALR(1) automaton using the new
   "--xml" option.  The current XML schema is experimental and may evolve.  More
   user feedback will help to stabilize it.

+  Contributed by Wojciech Polak.

 
 ** The grammar file may now specify the name of the parser header file using
   %defines.  For example:
 
 ** The grammar file may now specify the name of the parser header file using
   %defines.  For example:


@@ -1968,7 +2023,7 @@ Output file does not redefine const for C++.
 
 -----
 
 
 -----
 

-Copyright (C) 1995-2012 Free Software Foundation, Inc.
+Copyright (C) 1995-2013 Free Software Foundation, Inc.

 
 This file is part of Bison, the GNU Parser Generator.
 
 
 This file is part of Bison, the GNU Parser Generator.