Merge branch 'maint'

[bison.git] / NEWS

diff --git a/NEWS b/NEWS
index fd1cadd4c4dc7dcf16cedc28137e1b4748485af5..4b7caff84de01ee7a9cadb5d3de4f35896c63192 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -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
@@ -240,7 +244,7 @@ GNU Bison NEWS
 
 ** Bug fixes
 
-  Bugs in the test suite have been fixed.
+  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.
@@ -275,6 +279,51 @@ 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 re-throwing 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
+  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.
+
+** 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.
+
 * Noteworthy changes in release 2.6.2 (2012-08-03) [stable]
 
 ** Bug fixes