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Rename <!> to <>. Discussed starting at

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<http://lists.gnu.org/archive/html/bison-patches/2006-11/msg00039.html>.
* NEWS (2.3a+): Update.
* doc/bison.texinfo (Freeing Discarded Symbols, Bison Symbols):
Update.
* src/parse-gram.y (TYPE_TAG_NONE, generic_symlist_item): Implement.
* src/scan-gram.l (INITIAL): Implement.
* src/symlist.c (symbol_list_default_tagless_new): Update comment.
* src/symlist.h (symbol_list, symbol_list_default_tagless_new): Update
comment.
* tests/actions.at (Default tagless %printer and %destructor,
Default tagged and per-type %printer and %destructor,
Default %printer and %destructor are not for error or $undefined,
Default %printer and %destructor are not for $accept,
Default %printer and %destructor for mid-rule values): Update.
* tests/input.at (Default %printer and %destructor redeclared,
Unused values with default %destructor): Update.
This commit is contained in:
Joel E. Denny
2006-11-21 00:43:26 +00:00
parent 26b8a43805
commit 3ebecc240d
10 changed files with 69 additions and 49 deletions
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12
doc/bison.texinfo
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@@ -4237,7 +4237,7 @@ For instance, if your locations use a file name, you may use
@cindex freeing discarded symbols
@findex %destructor
@findex <*>
@findex <!>
@findex <>
During error recovery (@pxref{Error Recovery}), symbols already pushed
on the stack and tokens coming from the rest of the file are discarded
until the parser falls on its feet. If the parser runs out of memory,
@@ -4271,7 +4271,7 @@ grammar symbol that has that semantic type tag unless that symbol has its own
per-symbol @code{%destructor}.
Finally, you can define two different kinds of default @code{%destructor}s.
You can place each of @code{<*>} and @code{<!>} in the @var{symbols} list of
You can place each of @code{<*>} and @code{<>} in the @var{symbols} list of
exactly one @code{%destructor} declaration in your grammar file.
The parser will invoke the @var{code} associated with one of these whenever it
discards any user-defined grammar symbol that has no per-symbol and no per-type
@@ -4279,7 +4279,7 @@ discards any user-defined grammar symbol that has no per-symbol and no per-type
The parser uses the @var{code} for @code{<*>} in the case of such a grammar
symbol for which you have formally declared a semantic type tag (@code{%type}
counts as such a declaration, but @code{$<tag>$} does not).
The parser uses the @var{code} for @code{<!>} in the case of such a grammar
The parser uses the @var{code} for @code{<>} in the case of such a grammar
symbol that has no declared semantic type tag.
@end deffn
@@ -4300,7 +4300,7 @@ For example:
%destructor @{ @} <character>
%destructor @{ free ($$); @} <*>
%destructor @{ free ($$); printf ("%d", @@$.first_line); @} STRING1 string1
%destructor @{ printf ("Discarding tagless symbol.\n"); @} <!>
%destructor @{ printf ("Discarding tagless symbol.\n"); @} <>
@end smallexample
@noindent
@@ -4339,7 +4339,7 @@ not reference @code{$$} in the mid-rule's action or @code{$@var{n}} (where
@var{n} is the RHS symbol position of the mid-rule) in any later action in that
rule.
However, if you do reference either, the Bison-generated parser will invoke the
@code{<!>} @code{%destructor} whenever it discards the mid-rule symbol.
@code{<>} @code{%destructor} whenever it discards the mid-rule symbol.
@ignore
@noindent
@@ -8572,7 +8572,7 @@ Used to define a default tagged @code{%destructor} or default tagged
@xref{Destructor Decl, , Freeing Discarded Symbols}.
@end deffn
@deffn {Directive} <!>
@deffn {Directive} <>
Used to define a default tagless @code{%destructor} or default tagless
@code{%printer}.
@xref{Destructor Decl, , Freeing Discarded Symbols}.