c++: revamp the support for variants

[bison.git] / TODO

diff --git a/TODO b/TODO
index 978b5c6f4d45fb3664a39e00cd06ec41051e5181..846a9129df44021c88b8f17b37471bb2d3f09409 100644 (file)
--- a/TODO
+++ b/TODO
@@ -12,16 +12,45 @@ the pretty format of states from .output in the .dot
 Also, the underscore in print_graph.[ch] isn't very fitting considering
 the dashes in the other filenames.
 
+** push-parser
+Check it too when checking the different kinds of parsers.  And be
+sure to check that the initial-action is performed once per parsing.
+
+** m4 names
+b4_shared_declarations is no longer what it is.  Make it
+b4_parser_declaration for instance.
+
+** yychar in lalr1.cc
+There is a large difference bw maint and master on the handling of
+yychar (which was removed in lalr1.cc).  See what needs to be
+back-ported.
+
+
+    /* User semantic actions sometimes alter yychar, and that requires
+       that yytoken be updated with the new translation.  We take the
+       approach of translating immediately before every use of yytoken.
+       One alternative is translating here after every semantic action,
+       but that translation would be missed if the semantic action
+       invokes YYABORT, YYACCEPT, or YYERROR immediately after altering
+       yychar.  In the case of YYABORT or YYACCEPT, an incorrect
+       destructor might then be invoked immediately.  In the case of
+       YYERROR, subsequent parser actions might lead to an incorrect
+       destructor call or verbose syntax error message before the
+       lookahead is translated.  */
+
+    /* Make sure we have latest lookahead translation.  See comments at
+       user semantic actions for why this is necessary.  */
+    yytoken = yytranslate_ (yychar);
+
+
+** stack.hh
+Get rid of it.  The original idea is nice, but actually it makes
+the code harder to follow, and uselessly different from the other
+skeletons.
+
 ** Variable names.
 What should we name `variant' and `lex_symbol'?
 
-** Use b4_symbol in all the skeleton
-Move its definition in the more standard places and deploy it in other
-skeletons.  Then remove the older system, including the tables
-generated by output.c
-
-** Update the documentation on gnu.org
-
 ** Get rid of fake #lines [Bison: ...]
 Possibly as simple as checking whether the column number is nonnegative.
 
@@ -52,10 +81,6 @@ as lr0.cc, why upper case?
 Enhance bench.pl with %b to run different bisons.
 
 * Various
-** Warnings
-Warnings about type tags that are used in printer and dtors, but not
-for symbols?
-
 ** YYERRCODE
 Defined to 256, but not used, not documented.  Probably the token
 number for the error token, which POSIX wants to be 256, but which
@@ -101,9 +126,6 @@ so both 256 and 257 are "mysterious".
   "\"end of command\"", "error", "$undefined", "\"=\"", "\"break\"",
 
 
-** YYFAIL
-It is seems to be *really* obsolete now, shall we remove it?
-
 ** yychar == yyempty_
 The code in yyerrlab reads:
 
@@ -351,7 +373,7 @@ End:
 
 -----
 
-Copyright (C) 2001-2004, 2006, 2008-2012 Free Software Foundation, Inc.
+Copyright (C) 2001-2004, 2006, 2008-2013 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.