X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/06ec0105b12cdfa2994283e345154e6720354808..67411a88a0668401f9583526668e3930762c55f0:/TODO diff --git a/TODO b/TODO index e8509e3c..09fce089 100644 --- a/TODO +++ b/TODO @@ -1,16 +1,27 @@ * 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. +graphviz. 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 +An other consideration worth noting is that print_graph.c (correct me if I +am wrong) should contain generic functions, whereas graphviz.c and other +potential files should contain just the specific code for that output +format. It will probably prove difficult to tell if the implementation is +actually generic whilst only having support for a single format, but it +would be nice to keep stuff a bit tidier: right now, the construction of the +bitset used to show reductions is in the graphviz-specific code, and on the +opposite side we have some use of \l, which is graphviz-specific, in what +should be generic code. -Also, the underscore in print_graph.[ch] isn't very fitting considering -the dashes in the other filenames. +Little effort seems to have been given to factoring these files and their +rint{,-xml} counterpart. We would very much like to re-use the pretty format +of states from .output for the graphs, etc. + +Also, the underscore in print_graph.[ch] isn't very fitting considering the +dashes in the other filenames. + +Since graphviz dies on medium-to-big grammars, maybe consider an other tool? ** push-parser Check it too when checking the different kinds of parsers. And be @@ -43,18 +54,11 @@ back-ported. yytoken = yytranslate_ (yychar); -** $ 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. - ** 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. @@ -81,9 +85,6 @@ since it is no longer bound to a particular parser, it's just a ** 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 @@ -147,12 +148,6 @@ 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. -** 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 @@ -181,13 +176,13 @@ part of $default. Should we make the two reductions explicit, or just keep $default? See the following point. ** Disabled Reductions -See `tests/conflicts.at (Defaulted Conflicted Reduction)', and decide +See 'tests/conflicts.at (Defaulted Conflicted Reduction)', and decide what we want to do. ** Documentation Extend with error productions. The hard part will probably be finding the right rule so that a single state does not exhibit too many yet -undocumented ``features''. Maybe an empty action ought to be +undocumented ''features''. Maybe an empty action ought to be presented too. Shall we try to make a single grammar with all these features, or should we have several very small grammars? @@ -248,9 +243,9 @@ into exp: exp '+' exp | exp '&' exp; when there are no actions. This can significantly speed up some -grammars. I can't find the papers. In particular the book `LR +grammars. I can't find the papers. In particular the book 'LR parsing: Theory and Practice' is impossible to find, but according to -`Parsing Techniques: a Practical Guide', it includes information about +'Parsing Techniques: a Practical Guide', it includes information about this issue. Does anybody have it? @@ -278,9 +273,6 @@ Paul notes: 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 @@ -377,7 +369,7 @@ 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.