# Torturing Bison.                                    -*- Autotest -*-

# Copyright (C) 2001-2002, 2004-2007, 2009-2015, 2018-2021 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 3 of the License, 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, see <https://www.gnu.org/licenses/>.

AT_BANNER([[Torture Tests.]])


# AT_INCREASE_DATA_SIZE(SIZE)
# ---------------------------
# Try to increase the data size to SIZE KiB if possible.
m4_define([AT_INCREASE_DATA_SIZE],
[data_limit=`(ulimit -S -d) 2>/dev/null`
case $data_limit in
[[0-9]]*)
  if test "$data_limit" -lt $1; then
    AT_REQUIRE([ulimit -S -d $1])
    ulimit -S -d $1
  fi
esac])


## ------------------------------------- ##
## 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.
m4_define([AT_DATA_TRIANGULAR_GRAMMAR],
[AT_BISON_OPTION_PUSHDEFS
AT_DATA([[gengram.pl]],
[[#! /usr/bin/perl -w

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

print <<EOF;
]AT_DATA_GRAMMAR_PROLOGUE[
%define parse.error verbose
%debug
%{
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#define MAX $max
]AT_YYLEX_DECLARE[
]AT_YYERROR_DECLARE[
%}
%union
{
  int val;
};

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

for my $size (1 .. $max)
  {
    print "%token t$size $size \"$size\"\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;
%%
]AT_YYERROR_DEFINE[
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++;
}
]AT_MAIN_DEFINE[
EOF
]])
AT_BISON_OPTION_POPDEFS

AT_PERL_REQUIRE([-w ./gengram.pl $2], 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.
# With 500 and the new parser, which consume far too much memory,
# it gets killed too.  Of course the parser is to be cleaned.
AT_DATA_TRIANGULAR_GRAMMAR([input.y], [200])
AT_BISON_CHECK_NO_XML([-v -o input.c input.y])
AT_COMPILE([input])
AT_PARSER_CHECK([input])

AT_CLEANUP



# AT_DATA_HORIZONTAL_GRAMMAR(FILE-NAME, SIZE)
# -------------------------------------------
# Create FILE-NAME, containing a self checking parser for a huge
# horizontal grammar.
m4_define([AT_DATA_HORIZONTAL_GRAMMAR],
[AT_BISON_OPTION_PUSHDEFS
AT_DATA([[gengram.pl]],
[[#! /usr/bin/perl -w

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

print <<EOF;
]AT_DATA_GRAMMAR_PROLOGUE[
%define parse.error verbose
%debug
%{
#include <stdio.h>
#include <stdlib.h>
#define MAX $max
]AT_YYLEX_DECLARE[
]AT_YYERROR_DECLARE[
%}

%token
EOF
for my $size (1 .. $max)
  {
    print "    t$size $size \"$size\"\n";
  };

print <<EOF;

%%
EOF

use Text::Wrap;
print
  wrap ("exp: ", "  ",
        (map { "\"$_\"" } (1 .. $max)), ";"),
  "\n";

print <<\EOF;
%%
#include <assert.h>
]AT_YYERROR_DEFINE[
static int
yylex (void)
{
  static int counter = 1;
  if (counter <= MAX)
    return counter++;
  assert (counter++ == MAX + 1);
  return 0;
}
]AT_MAIN_DEFINE[
EOF
]])

AT_PERL_REQUIRE([-w ./gengram.pl $2], 0, [stdout])
mv stdout $1
AT_BISON_OPTION_POPDEFS
])


## ---------------- ##
## Big horizontal.  ##
## ---------------- ##

AT_SETUP([Big horizontal])

# I have been able to go up to 10000 on my machine, but I had to
# increase the maximum stack size (* 100).  It gave:
#
# input.y      263k
# input.tab.c  1.3M
# input        453k
#
# gengram.pl 10000                 0.70s user 0.01s sys  99% cpu    0.711 total
# bison input.y                  730.56s user 0.53s sys  99% cpu 12:12.34 total
# gcc -Wall input.tab.c -o input   5.81s user 0.20s sys 100% cpu     6.01 total
# ./input                          0.00s user 0.01s sys 108% cpu     0.01 total
#
AT_DATA_HORIZONTAL_GRAMMAR([input.y], [1000])

# GNU m4 requires about 70 MiB for this test on a 32-bit host.
# Ask for 200 MiB, which should be plenty even on a 64-bit host.
AT_INCREASE_DATA_SIZE(204000)

AT_BISON_CHECK_NO_XML([-o input.c input.y])
AT_COMPILE([input])
AT_PARSER_CHECK([input])

AT_CLEANUP



## ------------------- ##
## State number type.  ##
## ------------------- ##

# AT_TEST(NUM-STATES, TYPE)
# -------------------------
# Check that automaton with NUM-STATES uses TYPE has state number type.
# Check that parser works.

m4_pushdef([AT_TEST],
[AT_SETUP([State number type: $1 states])

AT_BISON_OPTION_PUSHDEFS

AT_REQUIRE([ruby $abs_top_srcdir/tests/linear $1 >input.y])
# Old versions of GCC reject large values given to #line.
AT_FULL_COMPILE([input], [], [], [], [--no-line])
AT_CHECK([[sed -ne 's/#define YYNSTATES  *\([0-9]*\)/\1/p' input.c]],   [], [$1
])
AT_CHECK([[sed -ne 's/typedef \(.*\) yy_state_t;/\1/p' input.c]], [], [$2
])
AT_PARSER_CHECK([input])

AT_BISON_OPTION_POPDEFS
AT_CLEANUP])

AT_TEST(  [128], [yytype_int8])
AT_TEST(  [129], [yytype_uint8])
AT_TEST(  [256], [yytype_uint8])
AT_TEST(  [257], [yytype_int16])
AT_TEST([32768], [yytype_int16])
AT_TEST([65536], [yytype_uint16])
AT_TEST([65537], [int])

m4_popdef([AT_TEST])



## ------------------------ ##
## Many lookahead tokens.   ##
## ------------------------ ##

# AT_DATA_LOOKAHEADS_GRAMMAR(FILE-NAME, SIZE)
# -------------------------------------------
# Create FILE-NAME, containing a self checking parser for a grammar
# requiring SIZE lookahead tokens.
m4_define([AT_DATA_LOOKAHEADS_GRAMMAR],
[AT_BISON_OPTION_PUSHDEFS
AT_DATA([[gengram.pl]],
[[#! /usr/bin/perl -w

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

print <<EOF;
%define parse.error verbose
%debug
%{
]AT_DATA_SOURCE_PROLOGUE[
# include <stdio.h>
# include <stdlib.h>
# include <assert.h>
# define MAX $max
]AT_YYLEX_DECLARE[
]AT_YYERROR_DECLARE[
%}
%union
{
  int val;
};

%type <val> input exp
%token token
EOF

print
  wrap ("%type <val> ",
        "            ",
        map { "n$_" } (1 .. $max)),
  "\n";

print "%token\n";
for my $count (1 .. $max)
  {
    print "    t$count $count \"$count\"\n";
  };

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

exp:
  n1 "1" { assert (\@S|@1 == 1); \@S|@\@S|@ = \@S|@1; }
EOF

for my $count (2 .. $max)
  {
    print "| n$count \"$count\" { assert (\@S|@1 == $count); \@S|@\@S|@ = \@S|@1; }\n";
  };
print ";\n";

for my $count (1 .. $max)
  {
    print "n$count: token { \$\$ = $count; };\n";
  };

print <<\EOF;
%%
]AT_YYERROR_DEFINE[
static int
yylex (void)
{
  static int return_token = 1;
  static int counter = 1;
  if (counter > MAX)
    {
      assert (counter++ == MAX + 1);
      return 0;
    }
  if (return_token)
    {
      return_token = 0;
      return token;
    }
  return_token = 1;
  return counter++;
}

]AT_MAIN_DEFINE[
EOF
]])

AT_PERL_REQUIRE([-w ./gengram.pl $2], 0, [stdout])
mv stdout $1
AT_BISON_OPTION_POPDEFS
])

AT_SETUP([Many lookahead tokens])

AT_DATA_LOOKAHEADS_GRAMMAR([input.y], [1000])

# GNU m4 requires about 70 MiB for this test on a 32-bit host.
# Ask for 200 MiB, which should be plenty even on a 64-bit host.
AT_INCREASE_DATA_SIZE(204000)

AT_BISON_CHECK([-v -o input.c input.y])
AT_COMPILE([input])
AT_PARSER_CHECK([input])

AT_CLEANUP



# AT_DATA_STACK_TORTURE(C-PROLOGUE, [BISON-DECLS])
# ------------------------------------------------
# A parser specialized in torturing the stack size.
m4_define([AT_DATA_STACK_TORTURE],
[AT_BISON_OPTION_PUSHDEFS([$2])
# A grammar of parens growing the stack thanks to right recursion.
AT_DATA_GRAMMAR([input.y],
[[%{
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
]$1[
  ]AT_YYLEX_DECLARE[
  ]AT_YYERROR_DECLARE[
%}
]$2[
%define parse.error verbose
%token WAIT_FOR_EOF
%%
exp: WAIT_FOR_EOF exp | %empty;
%%
]AT_YYERROR_DEFINE[
#include <assert.h>
static int
yylex (void)
{
  assert (0 <= yylval);
  if (yylval--)
    return WAIT_FOR_EOF;
  else
    return EOF;
}

/* Return argv[1] as an int. */
static int
get_args (int argc, const char **argv)
{
  long res;
  char *endp;
  assert (argc == 2); (void) argc;
  res = strtol (argv[1], &endp, 10);
  assert (argv[1] != endp);
  assert (0 <= res);
  assert (res <= INT_MAX);
  assert (errno != ERANGE);
  return YY_CAST (int, res);
}

int
main (int argc, const char **argv)
{
  YYSTYPE yylval_init = get_args (argc, argv);
  int status = 0;
  int count;
]m4_bmatch([$2], [api.push-pull both],
[[  yypstate *ps = yypstate_new ();
]])[
  for (count = 0; count < 2; ++count)
    {
      int new_status;
      yylval = yylval_init;
      new_status = ]m4_bmatch([$2], [api.push-pull both],
                              [[yypull_parse (ps)]],
                              [[yyparse ()]])[;
      if (count == 0)
        status = new_status;
      else
        assert (new_status == status);
    }]m4_bmatch([$2], [api.push-pull both], [[
  yypstate_delete (ps);]])[
  return status;
}
]])
AT_BISON_OPTION_POPDEFS([$2])
AT_BISON_CHECK([-o input.c input.y])
AT_COMPILE([input])
])


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

AT_SETUP([Exploding the Stack Size with Alloca])

m4_pushdef([AT_USE_ALLOCA], [[
#if (defined __GNUC__ || defined __BUILTIN_VA_ARG_INCR \
     || defined _AIX || defined _MSC_VER || defined _ALLOCA_H)
# define YYSTACK_USE_ALLOCA 1
#endif
]])

AT_DATA_STACK_TORTURE([AT_USE_ALLOCA])

# Below the limit of 200.
AT_PARSER_CHECK([input 20], 0, [], [ignore],
                [[VALGRIND_OPTS="$VALGRIND_OPTS --log-fd=1"]])
# Two enlargements: 2 * 2 * 200.
AT_PARSER_CHECK([input 900], 0, [], [ignore],
                [[VALGRIND_OPTS="$VALGRIND_OPTS --log-fd=1"]])
# 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_PARSER_CHECK([input 10000], 2, [], [ignore],
                [[VALGRIND_OPTS="$VALGRIND_OPTS --log-fd=1"]])

# The push parser can't use alloca since the stacks can't be locals.  This test
# just helps guarantee we don't let the YYSTACK_USE_ALLOCA feature affect
# push parsers.
AT_DATA_STACK_TORTURE([AT_USE_ALLOCA],
[[%define api.push-pull both
]])
AT_PARSER_CHECK([input 20], 0, [], [ignore],
                [[VALGRIND_OPTS="$VALGRIND_OPTS --log-fd=1"]])
AT_PARSER_CHECK([input 900], 0, [], [ignore],
                [[VALGRIND_OPTS="$VALGRIND_OPTS --log-fd=1"]])
AT_PARSER_CHECK([input 10000], 2, [], [ignore],
                [[VALGRIND_OPTS="$VALGRIND_OPTS --log-fd=1"]])

m4_popdef([AT_USE_ALLOCA])

AT_CLEANUP




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

AT_SETUP([Exploding the Stack Size with Malloc])

m4_pushdef([AT_USE_ALLOCA], [[#define YYSTACK_USE_ALLOCA 0]])

AT_DATA_STACK_TORTURE([AT_USE_ALLOCA])

# Below the limit of 200.
AT_PARSER_CHECK([input 20], 0, [], [ignore],
                [[VALGRIND_OPTS="$VALGRIND_OPTS --log-fd=1"]])
# Two enlargements: 2 * 2 * 200.
AT_PARSER_CHECK([input 900], 0, [], [ignore],
                [[VALGRIND_OPTS="$VALGRIND_OPTS --log-fd=1"]])
# 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_PARSER_CHECK([input 10000], 2, [], [ignore],
                [[VALGRIND_OPTS="$VALGRIND_OPTS --log-fd=1"]])

AT_DATA_STACK_TORTURE([AT_USE_ALLOCA],
[[%define api.push-pull both
]])
AT_PARSER_CHECK([input 20], 0, [], [ignore],
                [[VALGRIND_OPTS="$VALGRIND_OPTS --log-fd=1"]])
AT_PARSER_CHECK([input 900], 0, [], [ignore],
                [[VALGRIND_OPTS="$VALGRIND_OPTS --log-fd=1"]])
AT_PARSER_CHECK([input 10000], 2, [], [ignore],
                [[VALGRIND_OPTS="$VALGRIND_OPTS --log-fd=1"]])

m4_popdef([AT_USE_ALLOCA])

AT_CLEANUP