bison/tests/glr-regression.at

# Checking GLR Parsing: Regression Tests           -*- Autotest -*-
# Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.

AT_BANNER([[GLR Regression Tests]])

## --------------------------- ##
## Badly Collapsed GLR States. ##
## --------------------------- ##

AT_SETUP([Badly Collapsed GLR States])

AT_DATA_GRAMMAR([glr-regr1.y],
[[/* Regression Test: Improper state compression */
/* Reported by Scott McPeak */

%{
#include <stdio.h>

#define YYSTYPE int
static YYSTYPE exprMerge (YYSTYPE x0, YYSTYPE x1);
int yylex (void);
void yyerror (char const *msg);
%}


%glr-parser


/* -------- productions ------ */
%%

StartSymbol: E  { $$=0; }                   %merge <exprMerge>
           ;

E: E 'P' E { $$=1; printf("E -> E 'P' E\n"); }  %merge <exprMerge>
 | 'B'     { $$=2; printf("E -> 'B'\n"); }      %merge <exprMerge>
 ;



/* ---------- C code ----------- */
%%

static YYSTYPE exprMerge (YYSTYPE x0, YYSTYPE x1)
{
  (void) x0;
  (void) x1;
  printf ("<OR>\n");
  return 0;
}

int
main (void)
{
  return yyparse ();
}

void
yyerror (char const *msg)
{
  fprintf (stderr, "%s\n", msg);
}


int
yylex (void)
{
  for (;;)
    {
      int ch = getchar ();
      if (ch == EOF)
	return 0;
      else if (ch == 'B' || ch == 'P')
	return ch;
    }
}
]])

AT_CHECK([[bison -o glr-regr1.c glr-regr1.y]], 0, [],
[glr-regr1.y: conflicts: 1 shift/reduce
])
AT_COMPILE([glr-regr1])
AT_CHECK([[echo BPBPB | ./glr-regr1]], 0,
[[E -> 'B'
E -> 'B'
E -> E 'P' E
E -> 'B'
E -> E 'P' E
E -> 'B'
E -> E 'P' E
E -> E 'P' E
<OR>
]], [])

AT_CLEANUP

## ------------------------------------------------------------ ##
## Improper handling of embedded actions and $-N in GLR parsers ##
## ------------------------------------------------------------ ##

AT_SETUP([Improper handling of embedded actions and dollar(-N) in GLR parsers])

AT_DATA_GRAMMAR([glr-regr2a.y],
[[/* Regression Test: Improper handling of embedded actions and $-N  */
/* Reported by S. Eken */

%{
  #define YYSTYPE char const *
  #define yyfalse 0
  #define yytrue 1

  #include <ctype.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  int yylex (void);
  void yyerror (char const *);
%}

%glr-parser

%%

command:
    's' var 't'
       { printf ("Variable: '%s'\n", $2); }
    'v' 'x' 'q'
  | 's' var_list 't' 'e'
       { printf ("Varlist: '%s'\n", $2); }
  | 's' var 't' var_printer 'x'
  ;

var:
  'V'
     { $$ = $1; }
  ;

var_list:
  var
    { $$ = $1; }
  | var ',' var_list
    {
      char *s = (char *) malloc (strlen ($1) + 1 + strlen ($3) + 1);
      strcpy (s, $1);
      strcat (s, ",");
      strcat (s, $3);
      $$ = s;
    }
  ;

var_printer: 'v'
   { printf ("Variable: '%s'\n", $-1); }

%%

FILE *yyin = NULL;

int
yylex (void)
{
  char buf[50];
  char *s;
  switch (fscanf (yyin, " %1[a-z,]", buf)) {
  case 1:
    return buf[0];
  case EOF:
    return 0;
  default:
    break;
  }
  if (fscanf (yyin, "%49s", buf) != 1)
    return 0;
  if (sizeof buf - 1 <= strlen (buf))
    abort ();
  s = (char *) malloc (strlen (buf) + 1);
  strcpy (s, buf);
  yylval = s;
  return 'V';
}

void
yyerror (char const *s)
{ printf ("%s\n", s);
}

int
main (int argc, char **argv)
{
  yyin = stdin;
  if (argc == 2 && !(yyin = fopen (argv[1], "r"))) return 3;
  return yyparse ();
}
]])

AT_CHECK([[bison -o glr-regr2a.c glr-regr2a.y]], 0, [],
[glr-regr2a.y: conflicts: 2 shift/reduce
])
AT_COMPILE([glr-regr2a])

AT_CHECK([[echo s VARIABLE_1 t v x q | ./glr-regr2a]], 0,
[[Variable: 'VARIABLE_1'
]], [])
AT_CHECK([[echo s VARIABLE_1 , ANOTHER_VARIABLE_2 t e | ./glr-regr2a]], 0,
[[Varlist: 'VARIABLE_1,ANOTHER_VARIABLE_2'
]])
AT_CHECK([[echo s VARIABLE_3 t v x | ./glr-regr2a]], 0,
[[Variable: 'VARIABLE_3'
]], [])


AT_CLEANUP

## ------------------------------------------------------------ ##
## Improper merging of GLR delayed action sets                  ##
## ------------------------------------------------------------ ##

AT_SETUP([Improper merging of GLR delayed action sets])

AT_DATA_GRAMMAR([glr-regr3.y],
[[/* Regression Test: Improper merging of GLR delayed action sets.  */
/* Reported by M. Rosien */

%{
#include <stdio.h>
#include <stdarg.h>

static int MergeRule (int x0, int x1);
static void yyerror(char const * s);
int yylex (void);

#define RULE(x) (1 << (x))

%}

%glr-parser

%token BAD_CHAR
%token P1 P2 T1 T2 T3 T4 O1 O2

%%

S : P1 T4 O2 NT6 P2  { printf ("Result: %x\n", $4); }
;

NT1 : P1 T1 O1 T2 P2 { $$ = RULE(2); }  %merge<MergeRule>
;

NT2 : NT1             { $$ = RULE(3); } %merge<MergeRule>
    | P1 NT1 O1 T3 P2 { $$ = RULE(4); } %merge<MergeRule>
;

NT3 : T3              { $$ = RULE(5); } %merge<MergeRule>
    | P1 NT1 O1 T3 P2 { $$ = RULE(6); } %merge<MergeRule>
;

NT4 : NT3              { $$ = RULE(7); } %merge<MergeRule>
    | NT2              { $$ = RULE(8); } %merge<MergeRule>
    | P1 NT2 O1 NT3 P2 { $$ = RULE(9); } %merge<MergeRule>
;

NT5 : NT4              { $$ = RULE(10); } %merge<MergeRule>
;

NT6 : P1 NT1 O1 T3 P2  { $$ = RULE(11) | $2; } %merge<MergeRule>
    | NT5              { $$ = RULE(12) | $1; } %merge<MergeRule>
;

%%

static int MergeRule (int x0, int x1) {
  return x0 | x1;
}

static void yyerror(char const * s) {
  fprintf(stderr,"error: %s\n",s);
}

FILE *yyin = NULL;

int P[] = { P1, P2 };
int O[] = { O1, O2 };
int T[] = { T1, T2, T3, T4 };

int yylex (void)
{
  char inp[3];
  if (fscanf (yyin, "%2s", inp) == EOF)
    return 0;
  switch (inp[0])
    {
    case 'p': return P[inp[1] - '1'];
    case 't': return T[inp[1] - '1'];
    case 'o': return O[inp[1] - '1'];
    }
  return BAD_CHAR;
}

int main(int argc, char* argv[]) {
  yyin = stdin;
  if (argc == 2 && !(yyin = fopen (argv[1], "r"))) return 3;
  return yyparse ();
}
]])

AT_CHECK([[bison -o glr-regr3.c glr-regr3.y]], 0, [],
[glr-regr3.y: conflicts: 1 shift/reduce, 1 reduce/reduce
])
AT_COMPILE([glr-regr3])

AT_CHECK([[echo p1 t4 o2 p1 p1 t1 o1 t2 p2 o1 t3 p2 p2 | ./glr-regr3]], 0,
[[Result: 1c04
]], [])

AT_CLEANUP


## ---------------------------------------------------------------------- ##
## Duplicate representation of merged trees                               ##
## Thanks to Joel E. Denny for this test; see                             ##
## <http://lists.gnu.org/archive/html/help-bison/2005-07/msg00013.html>.  ##
## ---------------------------------------------------------------------- ##

AT_SETUP([Duplicate representation of merged trees])

AT_DATA_GRAMMAR([glr-regr4.y],
[[
%union { char *ptr; }
%type <ptr> S A A1 A2 B
%glr-parser

%{
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  static char *merge (YYSTYPE, YYSTYPE);
  static char *make_value (char const *, char const *);
  static void yyerror (char const *);
  static int yylex (void);
%}

%%

tree: S { printf ("%s\n", $1); } ;

S:
  A   %merge<merge> { $$ = make_value ("S", $1); }
  | B %merge<merge> { $$ = make_value ("S", $1); }
  ;

A:
  A1   %merge<merge> { $$ = make_value ("A", $1); }
  | A2 %merge<merge> { $$ = make_value ("A", $1); }
  ;

A1: 'a' { $$ = make_value ("A1", "'a'"); } ;
A2: 'a' { $$ = make_value ("A2", "'a'"); } ;
B:  'a' { $$ = make_value ("B", "'a'");  } ;

%%

static int
yylex (void)
{
  static char const *input = "a";
  return *input++;
}

int
main (void)
{
  return yyparse ();
}

static char *
make_value (char const *parent, char const *child)
{
  char const format[] = "%s <- %s";
  char *value =
    (char *) malloc (strlen (parent) + strlen (child) + sizeof format);
  sprintf (value, format, parent, child);
  return value;
}

static char *
merge (YYSTYPE s1, YYSTYPE s2)
{
  char const format[] = "merge{ %s and %s }";
  char *value =
    (char *) malloc (strlen (s1.ptr) + strlen (s2.ptr) + sizeof format);
  sprintf (value, format, s1.ptr, s2.ptr);
  return value;
}

static void
yyerror (char const *msg)
{
  fprintf (stderr, "%s\n", msg);
}
]])

AT_CHECK([[bison -o glr-regr4.c glr-regr4.y]], 0, [],
[glr-regr4.y: conflicts: 1 reduce/reduce
])
AT_COMPILE([glr-regr4])

AT_CHECK([[./glr-regr4]], 0,
[[merge{ S <- merge{ A <- A1 <- 'a' and A <- A2 <- 'a' } and S <- B <- 'a' }
]], [])

AT_CLEANUP


## ------------------------------------------------------------------------- ##
## User destructor for unresolved GLR semantic value                         ##
## Thanks to Joel E. Denny for this test; see                                ##
## <http://lists.gnu.org/archive/html/bison-patches/2005-08/msg00016.html>.  ##
## ------------------------------------------------------------------------- ##

AT_SETUP([User destructor for unresolved GLR semantic value])

AT_DATA_GRAMMAR([glr-regr5.y],
[[
%{
  #include <stdio.h>
  #include <stdlib.h>
  static void yyerror (char const *);
  static int yylex (void);
  enum { MAGIC_VALUE = -1057808125 }; /* originally chosen at random */
%}

%glr-parser
%union { int value; }
%type <value> start

%destructor {
  if ($$ != MAGIC_VALUE)
    {
      fprintf (stderr, "Bad destructor call.\n");
      exit (EXIT_FAILURE);
    }
} start

%%

start:
   'a' { $$ = MAGIC_VALUE; }
   | 'a' { $$ = MAGIC_VALUE; }
   ;

%%

static int
yylex (void)
{
  static char const *input = "a";
  return *input++;
}

static void
yyerror (char const *msg)
{
  fprintf (stderr, "%s\n", msg);
}

int
main (void)
{
  return yyparse () != 1;
}
]])

AT_CHECK([[bison -o glr-regr5.c glr-regr5.y]], 0, [],
[glr-regr5.y: conflicts: 1 reduce/reduce
])
AT_COMPILE([glr-regr5])

AT_CHECK([[./glr-regr5]], 0, [],
[syntax is ambiguous
])

AT_CLEANUP


## ------------------------------------------------------------------------- ##
## User destructor after an error during a split parse                       ##
## Thanks to Joel E. Denny for this test; see                                ##
## <http://lists.gnu.org/archive/html/bison-patches/2005-08/msg00029.html>.  ##
## ------------------------------------------------------------------------- ##

AT_SETUP([User destructor after an error during a split parse])

AT_DATA_GRAMMAR([glr-regr6.y],
[[
%{
  #include <stdio.h>
  #include <stdlib.h>
  static void yyerror (char const *);
  static int yylex (void);
%}

%glr-parser
%union { int value; }
%type <value> 'a'

%destructor {
  printf ("Destructor called.\n");
} 'a'

%%

start: 'a' | 'a' ;

%%

static int
yylex (void)
{
  static char const *input = "a";
  return *input++;
}

static void
yyerror (char const *msg)
{
  fprintf (stderr, "%s\n", msg);
}

int
main (void)
{
  return yyparse () != 1;
}
]])

AT_CHECK([[bison -o glr-regr6.c glr-regr6.y]], 0, [],
[glr-regr6.y: conflicts: 1 reduce/reduce
])
AT_COMPILE([glr-regr6])

AT_CHECK([[./glr-regr6]], 0,
[Destructor called.
],
[syntax is ambiguous
])

AT_CLEANUP


## ------------------------------------------------------------------------- ##
## Duplicated user destructor for lookahead                                  ##
## Thanks to Joel E. Denny for this test; see                                ##
## <http://lists.gnu.org/archive/html/bison-patches/2005-08/msg00035.html>.  ##
## ------------------------------------------------------------------------- ##

AT_SETUP([Duplicated user destructor for lookahead])

AT_DATA_GRAMMAR([glr-regr7.y],
[[
%{
  #include <stdio.h>
  #include <stdlib.h>
  static void yyerror (char const *);
  static int yylex (void);
  #define YYSTACKEXPANDABLE 0
%}

%glr-parser
%union { int *count; }
%type <count> 'a'

%destructor {
  if ((*$$)++)
    fprintf (stderr, "Destructor called on same value twice.\n");
} 'a'

%%

start:
    stack1 start
  | stack2 start
  | /* empty */
  ;
stack1: 'a' ;
stack2: 'a' ;

%%

static int
yylex (void)
{
  yylval.count = malloc (sizeof (int));
  if (!yylval.count)
    {
      fprintf (stderr, "Test inconclusive.\n");
      exit (EXIT_FAILURE);
    }
  *yylval.count = 0;
  return 'a';
}

static void
yyerror (char const *msg)
{
  fprintf (stderr, "%s\n", msg);
}

int
main (void)
{
  return yyparse ();
}
]])

AT_CHECK([[bison -o glr-regr7.c glr-regr7.y]], 0, [],
[glr-regr7.y: conflicts: 2 reduce/reduce
])
AT_COMPILE([glr-regr7])

AT_CHECK([[exit 77; ./glr-regr7]], 2, [],
[memory exhausted
])

AT_CLEANUP