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* tests/glr-regression.at (Uninitialized location when reporting

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ambiguity): New test case.
* data/glr.c (yyresolveLocations): New function, which uses
YYLLOC_DEFAULT.
(yyresolveValue): Invoke yyresolveLocations before reporting an
ambiguity.
* doc/bison.texinfo (Default Action for Locations): Note
YYLLOC_DEFAULT's usage for ambiguity locations.
(GLR Semantic Actions): Cross-reference those notes.
This commit is contained in:
Joel E. Denny
2006-03-06 07:39:11 +00:00
parent ae952af227
commit 8710fc41aa
4 changed files with 156 additions and 4 deletions
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79
tests/glr-regression.at
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@@ -1576,3 +1576,82 @@ AT_CHECK([[./glr-regr16]], 0, [],
])
AT_CLEANUP
## ------------------------------------------------------------------------- ##
## Uninitialized location when reporting ambiguity. ##
## ------------------------------------------------------------------------- ##
AT_SETUP([Uninitialized location when reporting ambiguity])
AT_DATA_GRAMMAR([glr-regr17.y],
[[
%glr-parser
%locations
%pure-parser
%error-verbose
%union { int dummy; }
%{
static void yyerror (YYLTYPE *, char const *);
static int yylex (YYSTYPE *, YYLTYPE *);
%}
%initial-action {
@$.first_line = 1;
@$.first_column = 1;
@$.last_line = 1;
@$.last_column = 1;
}
%%
/* Tests multiple levels of yyresolveLocations recursion. */
start: ambig1 | ambig2 ;
ambig1: sub_ambig1 | sub_ambig2 ;
ambig2: sub_ambig1 | sub_ambig2 ;
/* Tests non-empty RHS as well as empty RHS with either initial location or
location of previous token. Both empty RHS locations are printed in the
error message. */
sub_ambig1: empty 'a' 'b' empty ;
sub_ambig2: empty 'a' 'b' empty ;
empty: ;
%%
static void
yyerror (YYLTYPE *locp, char const *msg)
{
fprintf (stderr, "Error at %d.%d-%d.%d: %s.\n", locp->first_line,
locp->first_column, locp->last_line, locp->last_column, msg);
}
/*ARGSUSED*/ static int
yylex (YYSTYPE *lvalp, YYLTYPE *llocp)
{
static const char input[] = "ab";
static const char *inputp = input;
llocp->first_line = llocp->last_line = 2;
llocp->first_column = inputp - input + 1;
llocp->last_column = llocp->first_column + 1;
return *inputp++;
}
int
main (void)
{
return yyparse () != 1;
}
]])
AT_CHECK([[bison -o glr-regr17.c glr-regr17.y]], 0, [],
[glr-regr17.y: conflicts: 3 reduce/reduce
])
AT_COMPILE([glr-regr17])
AT_CHECK([[./glr-regr17]], 0, [],
[Error at 1.1-2.3: syntax is ambiguous.
])
AT_CLEANUP