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data/glr.c (yyfill): Adjust comment.

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(yyresolveAction): Initialize default location properly for empty right-hand
 sides.
 (yydoAction): Ditto.  Add comment explaining apparently dead code.
* tests/glr-regression.at
 (Incorrectly initialized location for empty right-hand side in GLR): New test.
This commit is contained in:
Paul Hilfinger
2005-10-31 01:16:32 +00:00
parent e10a80eeac
commit 44e7ead165
3 changed files with 123 additions and 6 deletions
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97
tests/glr-regression.at
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@@ -636,3 +636,100 @@ AT_CHECK([[./glr-regr7]], 2, [],
AT_XFAIL_IF(:)
AT_CLEANUP
## ------------------------------------------------------------------------- ##
## Incorrect default location for empty right-hand sides. Adapted from bug ##
## report by Claudia Hermann. ##
## See http://lists.gnu.org/archive/html/bug-bison/2005-10/msg00069.html and ##
## http://lists.gnu.org/archive/html/bug-bison/2005-10/msg00072.html ##
## ------------------------------------------------------------------------- ##
AT_SETUP([Incorrectly initialized location for empty right-hand side in GLR])
AT_DATA_GRAMMAR([glr-regr8.y],
[[
%{
#include <stdio.h>
#include <stdlib.h>
static void yyerror (char const *);
static int yylex (void);
static void yyerror(const char *msg);
%}
%token T_CONSTANT
%token T_PORT
%token T_SIGNAL
%glr-parser
%%
PortClause : T_PORT InterfaceDeclaration T_PORT
{ printf("%d/%d - %d/%d - %d/%d\n",
@1.first_column, @1.last_column,
@2.first_column, @2.last_column,
@3.first_column, @3.last_column); }
;
InterfaceDeclaration : OptConstantWord %dprec 1
| OptSignalWord %dprec 2
;
OptConstantWord : /* empty */
| T_CONSTANT
;
OptSignalWord : /* empty */
{ printf("empty: %d/%d\n", @$.first_column, @$.last_column); }
| T_SIGNAL
;
%%
void yyerror(const char *msg)
{
fprintf (stderr, "error\n");
}
static int lexIndex;
int yylex()
{
lexIndex += 1;
switch (lexIndex)
{
case 1:
yylloc.first_column = 1;
yylloc.last_column = 9;
return T_PORT;
case 2:
yylloc.first_column = 13;
yylloc.last_column = 17;
return T_PORT;
default:
return 0;
}
}
int
main (void)
{
yyparse();
return 0;
}
]])
AT_CHECK([[bison -o glr-regr8.c glr-regr8.y]], 0, [],
[glr-regr8.y: conflicts: 1 reduce/reduce
])
AT_COMPILE([glr-regr8])
AT_CHECK([[./glr-regr8]], 0,
[empty: 9/9
1/9 - 9/9 - 13/17
],
[])
AT_CLEANUP