Fix handling of yychar manipulation in user semantic actions.

[bison.git] / ChangeLog

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+2009-12-20  Joel E. Denny  <jdenny@clemson.edu>
+
+       Fix handling of yychar manipulation in user semantic actions.
+       The problem was that yacc.c didn't always update the yychar
+       translation afterwards.  However, other skeletons appear to be
+       fine.  glr.c appears to already translate yychar before every
+       use.  lalr1.cc does not define yychar and does not document its
+       replacement, yyla, for users.  It does provide yyclearin, but
+       that does not manipulate yyla and thus requires no translation
+       update.  In lalr1.java, yychar is out of scope during semantic
+       actions.
+       * NEWS (2.5): Document.
+       * data/yacc.c (YYBACKUP): Don't bother translating yychar into
+       yytoken here.
+       (yyparse, yypush_parse): Instead, translate before every use of
+       yytoken, and add comments explaining this approach.
+       * tests/actions.at (Destroying lookahead assigned by semantic
+       action): New test group checking that translation happens before
+       lookahead destructor calls at parser return.  Previously,
+       incorrect destructors were called.
+       * tests/conflicts.at (%error-verbose and consistent
+       errors): New test group checking that translation happens at
+       syntax error detection before the associated verbose error
+       message and the associated lookahead destructor calls.  While
+       the destructor call is fixed by this patch, the verbose error
+       message is currently incorrect due to another bug (see
+       comments in test group), so this is an expected failure for now.
+
 2009-12-21  Joel E. Denny  <jdenny@clemson.edu>
 
        YYFAIL: warn about uses and remove from lalr1.java.