src/bison/2.4.1/bison-2.4.1-src/tests/torture.at - chromium/deps/bison - Git at Google

 # Torturing Bison.                                    -*- Autotest -*-
 # Copyright (C) 2001, 2002, 2004, 2005, 2006, 2007 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 <http://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_CHECK([ulimit -S -d $1 || exit 77])
     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_DATA([[gengram.pl]],
 [[#! /usr/bin/perl -w

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

 print <<EOF;
 ]AT_DATA_GRAMMAR_PROLOGUE[
 %error-verbose
 %debug
 %{
 #include <stdio.h>
 #include <stdlib.h>

 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 .. $max)
   {
     print "%token t$size $size \"$size\"\n";
   };

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

 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.
 # 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_DATA([[gengram.pl]],
 [[#! /usr/bin/perl -w

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

 print <<EOF;
 ]AT_DATA_GRAMMAR_PROLOGUE[
 %error-verbose
 %debug
 %{
 #include <stdio.h>
 #include <stdlib.h>

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

 %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;
 %%
 static int
 yylex (void)
 {
   static int counter = 1;
   if (counter <= $max)
     return counter++;
   if (counter++ != $max + 1)
     abort ();
   return 0;
 }

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

 AT_CLEANUP


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

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

 print <<EOF;
 %error-verbose
 %debug
 %{
 # include <stdio.h>
 # include <stdlib.h>
 # include <assert.h>

 static int yylex (void);
 static void yyerror (const char *msg);
 %}
 %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;
 %%
 static int
 yylex (void)
 {
   static int return_token = 1;
   static int counter = 1;
   if (counter > $max)
     {
       if (counter++ != $max + 1)
 	abort ();
       return 0;
     }
   if (return_token)
     {
       return_token = 0;
       return token;
     }
   return_token = 1;
   return counter++;
 }

 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
 ])


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

 AT_SETUP([Many lookahead tokens])

 AT_DATA_LOOKAHEAD_TOKENS_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],
 [# A grammar of parens growing the stack thanks to right recursion.
 # exp:
 AT_DATA([input.y],
 [[%{
 #include <errno.h>
 #include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 ]$1[
   static int yylex (void);
   static void yyerror (const char *msg);
 %}
 ]$2[
 %error-verbose
 %debug
 %token WAIT_FOR_EOF
 %%
 exp: WAIT_FOR_EOF exp | ;
 %%
 static void
 yyerror (const char *msg)
 {
   fprintf (stderr, "%s\n", msg);
 }

 static int
 yylex (void)
 {
   if (yylval < 0)
     abort ();
   if (yylval--)
     return WAIT_FOR_EOF;
   else
     return EOF;
 }

 int
 main (int argc, const char **argv)
 {
   char *endp;
   YYSTYPE yylval_init;
   if (argc != 2)
     abort ();
   yylval_init = strtol (argv[1], &endp, 10);
   if (! (argv[1] != endp
 	 && 0 <= yylval_init && yylval_init <= INT_MAX
 	 && errno != ERANGE))
     abort ();
   yydebug = 1;
   {
     int count;
     int status;
 ]m4_bmatch([$2], [%push-],
 [[    yypstate *ps = yypstate_new ();
 ]])[    for (count = 0; count < 2; ++count)
       {
         int new_status;
         yylval = yylval_init;
 ]m4_bmatch([$2], [%push-],
 [[        new_status = yypull_parse (ps);
 ]],
 [[        new_status = yyparse ();
 ]])[        if (count > 0 && new_status != status)
           abort ();
         status = new_status;
       }
 ]m4_bmatch([$2], [%push-],
 [[    yypstate_delete (ps);
 ]])[    return status;
   }
 }
 ]])
 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
	# Torturing Bison. -- Autotest --
	# Copyright (C) 2001, 2002, 2004, 2005, 2006, 2007 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 <http://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_CHECK([ulimit -S -d $1 \|\| exit 77])
	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_DATA([[gengram.pl]],
	[[#! /usr/bin/perl -w

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

	print <<EOF;
	]AT_DATA_GRAMMAR_PROLOGUE[
	%error-verbose
	%debug
	%{
	#include <stdio.h>
	#include <stdlib.h>

	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 .. $max)
	{
	print "%token t$size $size \"$size\"\n";
	};

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

	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.
	# 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_DATA([[gengram.pl]],
	[[#! /usr/bin/perl -w

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

	print <<EOF;
	]AT_DATA_GRAMMAR_PROLOGUE[
	%error-verbose
	%debug
	%{
	#include <stdio.h>
	#include <stdlib.h>

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

	%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;
	%%
	static int
	yylex (void)
	{
	static int counter = 1;
	if (counter <= $max)
	return counter++;
	if (counter++ != $max + 1)
	abort ();
	return 0;
	}

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

	AT_CLEANUP



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

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

	print <<EOF;
	%error-verbose
	%debug
	%{
	# include <stdio.h>
	# include <stdlib.h>
	# include <assert.h>

	static int yylex (void);
	static void yyerror (const char *msg);
	%}
	%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;
	%%
	static int
	yylex (void)
	{
	static int return_token = 1;
	static int counter = 1;
	if (counter > $max)
	{
	if (counter++ != $max + 1)
	abort ();
	return 0;
	}
	if (return_token)
	{
	return_token = 0;
	return token;
	}
	return_token = 1;
	return counter++;
	}

	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
	])


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

	AT_SETUP([Many lookahead tokens])

	AT_DATA_LOOKAHEAD_TOKENS_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],
	[# A grammar of parens growing the stack thanks to right recursion.
	# exp:
	AT_DATA([input.y],
	[[%{
	#include <errno.h>
	#include <limits.h>
	#include <stdio.h>
	#include <stdlib.h>
	]$1[
	static int yylex (void);
	static void yyerror (const char *msg);
	%}
	]$2[
	%error-verbose
	%debug
	%token WAIT_FOR_EOF
	%%
	exp: WAIT_FOR_EOF exp \| ;
	%%
	static void
	yyerror (const char *msg)
	{
	fprintf (stderr, "%s\n", msg);
	}

	static int
	yylex (void)
	{
	if (yylval < 0)
	abort ();
	if (yylval--)
	return WAIT_FOR_EOF;
	else
	return EOF;
	}

	int
	main (int argc, const char **argv)
	{
	char *endp;
	YYSTYPE yylval_init;
	if (argc != 2)
	abort ();
	yylval_init = strtol (argv[1], &endp, 10);
	if (! (argv[1] != endp
	&& 0 <= yylval_init && yylval_init <= INT_MAX
	&& errno != ERANGE))
	abort ();
	yydebug = 1;
	{
	int count;
	int status;
	]m4_bmatch([$2], [%push-],
	[[ yypstate *ps = yypstate_new ();
	]])[ for (count = 0; count < 2; ++count)
	{
	int new_status;
	yylval = yylval_init;
	]m4_bmatch([$2], [%push-],
	[[ new_status = yypull_parse (ps);
	]],
	[[ new_status = yyparse ();
	]])[ if (count > 0 && new_status != status)
	abort ();
	status = new_status;
	}
	]m4_bmatch([$2], [%push-],
	[[ yypstate_delete (ps);
	]])[ return status;
	}
	}
	]])
	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