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lalr1, yacc: use the default location as initial error location

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Currently lalr1.cc makes an out-of-bound access when trying to read @1
in rules with an empty rhs (i.e., when there is no @1) that raises an
error (YYERROR).

glr.c already gracefully handles this by using @$ as initial location
for the errors.  Let's do that in yacc.c and lalr1.cc.

* data/lalr1.cc, data/yacc.c: Use @$ to initialize the error location.
* tests/actions.at: Check that case.
This commit is contained in:
Akim Demaille
2015-08-11 13:48:57 +02:00
parent 55fb68aabf
commit 476c1cca59
4 changed files with 97 additions and 12 deletions
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11
NEWS
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@@ -2,6 +2,17 @@ GNU Bison NEWS
* Noteworthy changes in release ?.? (????-??-??) [?]
** Bug fixes
*** Location of errors
In C++ parsers, out-of-bounds errors can happen when a rule with an empty
ride-hand side raises a syntax error. The behavior of the default parser
(yacc.c) in such a condition was undefined.
Now all the parsers match the behavior of glr.c: @$ is used as the
location of the error. This handles gracefully rules with and without
rhs.
* Noteworthy changes in release 3.0.4 (2015-01-23) [stable]