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Fix a bug where error locations were not being recorded correctly.

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Warn if we detect conflicting outputs to the same file.

If the user specifies "%expect N", report an error if there are any
reduce/reduce conflicts.
This commit is contained in:
Paul Eggert
2002-12-28 09:02:18 +00:00
parent 120f129d67
commit b1efe548af
1 changed files with 34 additions and 0 deletions
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@@ -1,5 +1,39 @@
2002-12-27 Paul Eggert <eggert@twinsun.com>
Fix a bug where error locations were not being recorded correctly.
This problem was originally reported by Paul Hilfinger in
<http://mail.gnu.org/pipermail/bug-bison/2002-November/001901.html>.
* data/yacc.c (yyparse): New local var yylerrsp, to record the
top of the location stack's error locations.
(yyerrlab): Set it. When discarding a token, push its location
onto yylerrsp so that we don't lose track of the error's end.
(yyerrlab1): Now is only the target of YYERROR, so that we can
properly record the location of the action that failed. For GCC
2.93 and later, insert an __attribute__ ((__unused__)) to avoid
GCC warning about yyerrlab1 being unused if YYERROR is unused.
(yyerrlab2): New label, which yyerrlab now falls through to.
Compute the error's location by applying YYLLOC_DEFAULT to
the locations of all the symbols that went into the error.
* doc/bison.texinfo (Location Default Action): Mention that
YYLLOC_DEFAULT is also invoked for syntax errors.
* tests/actions.at (_AT_CHECK_PRINTER_AND_DESTRUCTOR):
Error locations include the locations of all the tokens that were
discarded, not just the last token.
2002-12-26 Paul Eggert <eggert@twinsun.com>
* src/files.c: Include quote.h.
(compute_output_file_names): Warn if we detect conflicting
outputs to the same file. This should catch the misunderstanding
exemplified by Debian Bug 165349, reported by Bruce Stephens..
* src/conflicts.c (conflicts_print): If the user specifies
"%expect N", report an error if there are any reduce/reduce
conflicts. This is what the manual says should happen.
This fixes Debian bug 130890, reported by Anthony DeRobertis.
* tests/conflicts.at (%expect with reduce conflicts): New test.
Don't use m4_include on relative file names, as it doesn't work as
desired if there happens to be a file with that name under ".".