regen

[bison.git] / TODO

diff --git a/TODO b/TODO
index 25fce49905b05d36edd41cb3360d044f25571013..18c8999553c871f85db03bfc893155c952bec27a 100644 (file)
--- a/TODO
+++ b/TODO
@@ -1,4 +1,17 @@
 * Short term
 * Short term

+** Graphviz display code thoughts
+The code for the --graph option is over two files: print_graph, and
+graphviz. I believe this is because Bison used to also produce VCG graphs,
+but since this is no longer true, maybe we could consider these files for
+fusion.
+
+Little effort factoring seems to have been given to factoring in these files,
+and their print-xml and print counterpart. We would very much like to re-use
+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.
 ** 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.


@@ -7,18 +20,34 @@ sure to check that the initial-action is performed once per parsing.
 b4_shared_declarations is no longer what it is.  Make it
 b4_parser_declaration for instance.
 
 b4_shared_declarations is no longer what it is.  Make it
 b4_parser_declaration for instance.
 

-** $ and others in epilogue
-A stray $ is a warning in the actions, but an error in the epilogue.
-IMHO, it should not even be a warning in the epilogue.
+** 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.
 
 
 ** 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'?
-

 ** Get rid of fake #lines [Bison: ...]
 Possibly as simple as checking whether the column number is nonnegative.
 
 ** Get rid of fake #lines [Bison: ...]
 Possibly as simple as checking whether the column number is nonnegative.
 


@@ -45,9 +74,6 @@ since it is no longer bound to a particular parser, it's just a
 ** Rename LR0.cc
 as lr0.cc, why upper case?
 
 ** Rename LR0.cc
 as lr0.cc, why upper case?
 

-** bench several bisons.
-Enhance bench.pl with %b to run different bisons.
-

 * Various
 ** YYERRCODE
 Defined to 256, but not used, not documented.  Probably the token
 * Various
 ** YYERRCODE
 Defined to 256, but not used, not documented.  Probably the token


@@ -111,12 +137,6 @@ really possible?  The test suite does not exercise this case.
 This shows that it would be interesting to manage to install skeleton
 coverage analysis to the test suite.
 
 This shows that it would be interesting to manage to install skeleton
 coverage analysis to the test suite.
 

-** Table definitions
-It should be very easy to factor the definition of the various tables,
-including the separation bw declaration and definition.  See for
-instance b4_table_define in lalr1.cc.  This way, we could even factor
-C vs. C++ definitions.
-

 * From lalr1.cc to yacc.c
 ** Single stack
 Merging the three stacks in lalr1.cc simplified the code, prompted for
 * From lalr1.cc to yacc.c
 ** Single stack
 Merging the three stacks in lalr1.cc simplified the code, prompted for


@@ -242,9 +262,6 @@ Paul notes:
         tokens, either via escapes (e.g., "x\0y") or via a NUL byte in
         the source code.  This should get fixed.
 
         tokens, either via escapes (e.g., "x\0y") or via a NUL byte in
         the source code.  This should get fixed.
 

-* --graph
-Show reductions.
-

 * Broken options ?
 ** %token-table
 ** Skeleton strategy
 * Broken options ?
 ** %token-table
 ** Skeleton strategy


@@ -341,7 +358,7 @@ 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.
 
 
 This file is part of Bison, the GNU Compiler Compiler.