bison/tests/torture.at

# Torturing Bison.                                    -*- Autotest -*-
# Copyright (C) 2001, 2002 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., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.

AT_BANNER([[Torture Tests.]])


## ------------------------------------- ##
## Creating a large artificial grammar.  ##
## ------------------------------------- ##

# AT_DATA_TRIANGULAR_GRAMMAR(FILE-NAME, SIZE)
# -------------------------------------------
# Create FILE-NAME, containing a self checking parser for a huge
# triangular grammar.
# FIXME: The `10 *' below are there to avoid clashes with predefined
# tokens.  These clashes should be exercised, I'm afraid something
# is broken wrt previous Bisons.
m4_define([AT_DATA_TRIANGULAR_GRAMMAR],
[AT_DATA([[gengram.pl]],
[[#! /usr/bin/perl -w

use strict;
my $max = $ARGV[0] || 10;

print <<EOF;
%{
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

#define YYERROR_VERBOSE 1
#define YYDEBUG 1

static int yylex (void);
static void yyerror (const char *msg);
%}
%union
{
  int val;
};

%token END "end"
%type <val> exp input
EOF

for my $size (1 .. $max)
  {
    print "%token \"$size\" ", $size * 10, "\n";
  };

print <<EOF;
%%
input:
  exp        { assert (\@S|@1 == 0); \$\$ = \@S|@1; }
| input exp  { assert (\@S|@2 == \@S|@1 + 1); \$\$ = \@S|@2; }
;

exp:
  END
    { \$\$ = 0; }
EOF

for my $size (1 .. $max)
  {
    use Text::Wrap;
    print wrap ("| ", "   ",
		(map { "\"$_\"" } (1 .. $size)),
		" END \n"),
		  "    { \$\$ = $size; }\n";
  };
print ";\n";

print <<EOF;
%%
static int
yylex (void)
{
  static int inner = 1;
  static int outer = 0;
  if (outer > $max)
    return 0;
  else if (inner > outer)
    {
      inner = 1;
      ++outer;
      return END;
    }
  return inner++ * 10;
}

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

int
main (void)
{
  yydebug = !!getenv ("YYDEBUG");
  return yyparse ();
}
EOF
]])

AT_CHECK([perl -w ./gengram.pl $2 || exit 77], 0, [stdout])
mv stdout $1
])


## -------------- ##
## Big triangle.  ##
## -------------- ##

AT_SETUP([Big triangle])

# I have been able to go up to 2000 on my machine.
# I tried 3000, a 29Mb grammar file, but then my system killed bison.
AT_DATA_TRIANGULAR_GRAMMAR([input.y], [500])
AT_CHECK([bison input.y -v -o input.c])
AT_CHECK([$CC $CFLAGS $CPPFLAGS input.c -o input], 0, [], [ignore])
AT_CHECK([./input])

AT_CLEANUP



# AT_DATA_STACK_TORTURE(C-PROLOGUE)
# ---------------------------------
# A parser specialized in torturing the stack size.
m4_define([AT_DATA_STACK_TORTURE],
[# A grammar of parens growing the stack thanks to right recursion.
# exp:
AT_DATA([input.y],
[[%{
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
]$1[
  static int yylex (void);
  static void yyerror (const char *msg);
#define YYPRINT(File, Type, Value)                   \
  fprintf (File, " (%d, stack size = %d, max = %d)", \
           Value, yyssp - yyss + 1, yystacksize);
%}
%error-verbose
%debug
%token WAIT_FOR_EOF
%%
exp: WAIT_FOR_EOF exp | ;
%%
static void
yyerror (const char *msg)
{
  fprintf (stderr, "%s\n", msg);
  exit (1);
}

/* There are YYLVAL_MAX of WAIT_FOR_EOFs. */
unsigned int yylval_max;

static int
yylex (void)
{
  if (yylval--)
    return WAIT_FOR_EOF;
  else
    return EOF;
}

int
main (int argc, const char **argv)
{
  assert (argc == 2);
  yylval = atoi (argv[1]);
  yydebug = 1;
  return yyparse ();
}
]])
AT_CHECK([bison input.y -o input.c])
AT_CHECK([$CC $CFLAGS $CPPFLAGS input.c -o input], 0, [], [ignore])
])


## -------------------------------------- ##
## Exploding the Stack Size with Alloca.  ##
## -------------------------------------- ##

AT_SETUP([Exploding the Stack Size with Alloca])

AT_DATA_STACK_TORTURE

# Below the limit of 200.
AT_CHECK([./input 20], 0, [], [ignore])
# Two enlargements: 2 * 2 * 200.
AT_CHECK([./input 900], 0, [], [ignore])
# Fails: beyond the limit of 10,000 (which we don't reach anyway since we
# multiply by two starting at 200 => 5120 is the last possible).
AT_CHECK([./input 10000], 1, [], [ignore])

AT_CLEANUP




## -------------------------------------- ##
## Exploding the Stack Size with Malloc.  ##
## -------------------------------------- ##

AT_SETUP([Exploding the Stack Size with Malloc])

AT_DATA_STACK_TORTURE([[#define YYSTACK_USE_ALLOCA 0]])

# Below the limit of 200.
AT_CHECK([./input 20], 0, [], [ignore])
# Two enlargements: 2 * 2 * 200.
AT_CHECK([./input 900], 0, [], [ignore])
# Fails: beyond the limit of 10,000 (which we don't reach anyway since we
# multiply by two starting at 200 => 5120 is the possible).
AT_CHECK([./input 10000], 1, [], [ignore])

AT_CLEANUP