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TODO: lalr1.cc master vs maint

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* TODO: here.
This commit is contained in:
Akim Demaille
2012-09-20 17:17:02 +02:00
parent 77a1a208a9
commit 51c994d8f0
1 changed files with 23 additions and 0 deletions
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@@ -7,6 +7,29 @@ sure to check that the initial-action is performed once per parsing.
b4_shared_declarations is no longer what it is. Make it b4_shared_declarations is no longer what it is. Make it
b4_parser_declaration for instance. 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);
** $ and others in epilogue ** $ and others in epilogue
A stray $ is a warning in the actions, but an error in the 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. IMHO, it should not even be a warning in the epilogue.