Thank the developer of the initial push parser implementation.

[bison.git] / etc / bench.pl.in

diff --git a/etc/bench.pl.in b/etc/bench.pl.in
index bdde3ceb951e0cd74f6f689a4072ca0d46922ba3..0e80b4614b95707220cf6fbf53cf394ba9a5ac59 100755 (executable)
--- a/etc/bench.pl.in
+++ b/etc/bench.pl.in
@@ -1,6 +1,6 @@
 #! /usr/bin/perl -w
 
 #! /usr/bin/perl -w
 

-# Copyright (C) 2006, 2008 Free Software Foundation, Inc.
+# Copyright (C) 2006, 2008-2010 Free Software Foundation, Inc.

 #
 # This file is part of Bison, the GNU Compiler Compiler.
 #
 #
 # This file is part of Bison, the GNU Compiler Compiler.
 #


@@ -19,22 +19,43 @@
 
 =head1 NAME
 
 
 =head1 NAME
 

-bench.pl - perform benches on Bison parsers.
+bench.pl - bench marks for Bison parsers.

 
 =head1 SYNOPSIS
 
 
 =head1 SYNOPSIS
 

-  ./bench.pl [OPTIONS]... BENCHES
+  ./bench.pl [OPTIONS]... DIRECTIVES

 
 

-=head1 BENCHES
+=head1 DIRECTIVES

 
 

-Specify the set of benches to run.  I<bench-name> should be one of:
+Specify the set of benches to run.  The following grammar defines the
+I<directives>:
+
+   directives ::=
+       directives | directives  -- Alternation
+     | directives & directives  -- Concatenation
+     | [ directives> ]          -- Optional
+     | ( directives> )          -- Parentheses
+     | #d NAME[=VALUE]          -- %code { #define NAME [VALUE] }
+     | %d NAME[=VALUE]          -- %define NAME ["VALUE"]
+     | %s skeleton              -- %skeleton "skeleton"
+     | directive
+
+Parentheses only group to override precedence.  For instance:
+
+  [ %debug ] & [ %error-verbose ] & [ %define variant ]
+
+will generate eight different cases.
+
+=head1 OPTIONS

 
 =over 4
 
 
 =over 4
 

-=item I<fusion>
+=item B<-b>, B<--bench>
+
+Predefined benches, that is, combimation between a grammar and a I<directives>
+request.

 
 

-Test F<lalr1.cc> with three stacks against F<lalr1-fusion.cc> which
-uses a single one.
+=over 4

 
 =item I<push>
 
 
 =item I<push>
 


@@ -46,8 +67,6 @@ Test the use of variants instead of union in the C++ parser.
 
 =back
 
 
 =back
 

-=head1 OPTIONS
-

 =item B<-c>, B<--cflags>=I<flags>
 
 Flags to pass to the C or C++ compiler.  Defaults to -O2.
 =item B<-c>, B<--cflags>=I<flags>
 
 Flags to pass to the C or C++ compiler.  Defaults to -O2.


@@ -56,6 +75,27 @@ Flags to pass to the C or C++ compiler.  Defaults to -O2.
 
 Add a set of Bison directives to bench against each other.
 
 
 Add a set of Bison directives to bench against each other.
 

+=item B<-g>, B<--grammar>=I<grammar>
+
+Select the base I<grammar> to use.  Defaults to I<calc>.
+
+=over 4
+
+=item I<calc>
+
+Traditional calculator.
+
+=item I<list>
+
+C++ grammar that uses std::string and std::list.  Can be used with
+or without %define variant.
+
+=item I<triangular>
+
+Artificial grammar with very long rules.
+
+=back
+

 =item B<-h>, B<--help>
 
 Display this message and exit succesfully.  The more verbose, the more
 =item B<-h>, B<--help>
 
 Display this message and exit succesfully.  The more verbose, the more


@@ -124,11 +164,13 @@ Verbosity level.
 
 =cut
 
 
 =cut
 

+my $bench;

 my $bison = $ENV{'BISON'} || '@abs_top_builddir@/tests/bison';
 my $cc = $ENV{'CC'} || 'gcc';
 my $cxx = $ENV{'CXX'} || 'g++';
 my $cflags = '-O2';
 my @directive = ();
 my $bison = $ENV{'BISON'} || '@abs_top_builddir@/tests/bison';
 my $cc = $ENV{'CC'} || 'gcc';
 my $cxx = $ENV{'CXX'} || 'g++';
 my $cflags = '-O2';
 my @directive = ();

+my $grammar = 'calc';

 my $iterations = -1;
 my $verbose = 1;
 
 my $iterations = -1;
 my $verbose = 1;
 


@@ -204,7 +246,6 @@ sub generate_grammar_triangular ($$@)
     or die;
   print $out <<EOF;
 %error-verbose
     or die;
   print $out <<EOF;
 %error-verbose

-%debug

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


@@ -276,7 +317,9 @@ yyerror (const char *msg)
 int
 main (void)
 {
 int
 main (void)
 {

+#if YYDEBUG

   yydebug = !!getenv ("YYDEBUG");
   yydebug = !!getenv ("YYDEBUG");

+#endif

   return yyparse ();
 }
 EOF
   return yyparse ();
 }
 EOF


@@ -320,6 +363,10 @@ sub generate_grammar_calc ($$@)
   my ($base, $max, @directive) = @_;
   my $directives = directives ($base, @directive);
 
   my ($base, $max, @directive) = @_;
   my $directives = directives ($base, @directive);
 

+  # Putting this request here is stupid, since the input will be
+  # generated each time we generate a grammar.
+  calc_input ('calc', 200);
+

   my $out = new IO::File ">$base.y"
     or die;
   print $out <<EOF;
   my $out = new IO::File ">$base.y"
     or die;
   print $out <<EOF;


@@ -497,6 +544,10 @@ main (int argc, const char **argv)
   int count = 0;
   int status;
 
   int count = 0;
   int status;
 

+#if YYDEBUG
+  yydebug = !!getenv ("YYDEBUG");
+#endif
+

   input = fopen ("calc.input", "r");
   if (!input)
     {
   input = fopen ("calc.input", "r");
   if (!input)
     {


@@ -517,48 +568,65 @@ EOF
 
 ##################################################################
 
 
 ##################################################################
 

-=item C<generate_grammar_variant ($base, $max, @directive)>
+=item C<generate_grammar_list ($base, $max, @directive)>

 
 

-Generate a Bison file F<$base.y> that uses, or not, the Boost.Variants
-depending on the C<@directive>.
+Generate a Bison file F<$base.y> for a C++ parser that uses C++
+objects (std::string, std::list).  Tailored for using %define variant.

 
 =cut
 
 
 =cut
 

-sub generate_grammar_variant ($$@)
+sub generate_grammar_list ($$@)

 {
   my ($base, $max, @directive) = @_;
   my $directives = directives ($base, @directive);
 {
   my ($base, $max, @directive) = @_;
   my $directives = directives ($base, @directive);

-  my $variant = grep { $_ eq '%define variant' } @directive;
-
+  my $variant = grep { /%define "?variant"?/ } @directive;
+  my $lex_symbol = grep { /%define "?lex_symbol"?/ } @directive;

   my $out = new IO::File ">$base.y"
     or die;
   print $out <<EOF;
 %language "C++"
 %defines
   my $out = new IO::File ">$base.y"
     or die;
   print $out <<EOF;
 %language "C++"
 %defines

+%locations

 $directives
 
 $directives
 

-%code requires // variant.h
+%code requires // *.h

 {
 #include <string>
 }
 
 {
 #include <string>
 }
 

-%code // variant.c
+%code // *.c

 {
 #include <algorithm>
 #include <iostream>
 #include <sstream>
 
 {
 #include <algorithm>
 #include <iostream>
 #include <sstream>
 

-// Prototype of the yylex function providing subsequent tokens.
-static yy::parser::token_type yylex(yy::parser::semantic_type* yylval);
-

 #define STAGE_MAX    ($max * 10) // max = $max
 #define STAGE_MAX    ($max * 10) // max = $max

+
+#define USE_LEX_SYMBOL $lex_symbol

 #define USE_VARIANTS $variant
 #define USE_VARIANTS $variant

-#if USE_VARIANTS
-# define IF_VARIANTS(True, False) True
+
+  // Prototype of the yylex function providing subsequent tokens.
+  static
+#if USE_LEX_SYMBOL
+  yy::parser::symbol_type yylex();

 #else
 #else

-# define IF_VARIANTS(True, False) False
+  yy::parser::token_type yylex(yy::parser::semantic_type* yylval,
+                               yy::parser::location_type* yylloc);

 #endif
 #endif

+
+  // Conversion to string.
+  template <typename T>
+    inline
+    std::string
+    string_cast (const T& t)
+  {
+    std::ostringstream o;
+    o << t;
+    return o.str ();
+  }

 }
 }

+
+%token END_OF_FILE 0

 EOF
 
   if ($variant)
 EOF
 
   if ($variant)


@@ -568,7 +636,6 @@ EOF
 %token <int> NUMBER
 %printer { std::cerr << "Number: " << $$; } <int>
 %printer { std::cerr << "Text: " << $$; } <std::string>
 %token <int> NUMBER
 %printer { std::cerr << "Number: " << $$; } <int>
 %printer { std::cerr << "Text: " << $$; } <std::string>

-%token END_OF_FILE 0

 %type <std::string> text result
 
 %%
 %type <std::string> text result
 
 %%


@@ -578,13 +645,8 @@ result:
 
 text:
   /* nothing */                { /* This will generate an empty string */ }
 
 text:
   /* nothing */                { /* This will generate an empty string */ }

-| text TEXT            { std::swap($$,$1); $$.append($2); }
-| text NUMBER          {
-                         std::swap($$,$1);
-                          std::ostringstream ss;
-                         ss << ' ' << $2;
-                         $$.append(ss.str());
-                        }
+| text TEXT            { std::swap ($$, $2); }
+| text NUMBER          { $$ = string_cast($2); }

 ;
 EOF
     }
 ;
 EOF
     }


@@ -597,7 +659,6 @@ EOF
 %token <ival> NUMBER
 %printer { std::cerr << "Number: " << $$; } <ival>
 %printer { std::cerr << "Text: " << *$$; } <sval>
 %token <ival> NUMBER
 %printer { std::cerr << "Number: " << $$; } <ival>
 %printer { std::cerr << "Text: " << *$$; } <sval>

-%token END_OF_FILE 0

 %type <sval> text result
 
 %%
 %type <sval> text result
 
 %%


@@ -607,45 +668,77 @@ result:
 
 text:
   /* nothing */                { $$ = new std::string; }
 
 text:
   /* nothing */                { $$ = new std::string; }

-| text TEXT            { $$->append(*$2); delete $2; }
-| text NUMBER          {
-                         std::ostringstream ss;
-                         ss << ' ' << $2;
-                         $$->append(ss.str());
-                        }
+| text TEXT            { delete $1; $$ = $2; }
+| text NUMBER          { delete $1; $$ = new std::string (string_cast ($2)); }

 ;
 EOF
     }
 
   print $out <<'EOF';
 %%
 ;
 EOF
     }
 
   print $out <<'EOF';
 %%

+#
+

 static
 static

-yy::parser::token_type
-yylex(yy::parser::semantic_type* yylval)
+#if USE_LEX_SYMBOL
+yy::parser::symbol_type yylex()
+#else
+yy::parser::token_type yylex(yy::parser::semantic_type* yylval,
+                             yy::parser::location_type* yylloc)
+#endif

 {
 {

+  typedef yy::parser::location_type location_type;
+  typedef yy::parser::token token;

   static int stage = -1;
   ++stage;
   if (stage == STAGE_MAX)
   static int stage = -1;
   ++stage;
   if (stage == STAGE_MAX)

-    return yy::parser::token::END_OF_FILE;
+    {
+#if USE_LEX_SYMBOL
+      return yy::parser::make_END_OF_FILE (location_type ());
+#else
+      *yylloc = location_type ();
+      return token::END_OF_FILE;
+#endif
+    }

   else if (stage % 2)
     {
   else if (stage % 2)
     {

-      IF_VARIANTS(yylval->build<int>(), yylval->ival) = stage;
-      return yy::parser::token::NUMBER;
+#if USE_LEX_SYMBOL
+      return yy::parser::make_NUMBER (stage, location_type ());
+#else
+# if defined ONE_STAGE_BUILD
+      yylval->build(stage);
+# elif USE_VARIANTS
+      yylval->build<int>() = stage;
+# else
+      yylval->ival = stage;
+# endif
+      *yylloc = location_type ();
+      return token::NUMBER;
+#endif

     }
   else
     {
     }
   else
     {

-      IF_VARIANTS(yylval->build<std::string>() =, yylval->sval = new) std::string("A string.");
-      return yy::parser::token::TEXT;
+#if USE_LEX_SYMBOL
+      return yy::parser::make_TEXT ("A string.", location_type ());
+#else
+# if defined ONE_STAGE_BUILD
+      yylval->build(std::string("A string."));
+# elif USE_VARIANTS
+      yylval->build<std::string>() = std::string("A string.");
+# else
+      yylval->sval = new std::string("A string.");
+# endif
+      *yylloc = location_type ();
+      return token::TEXT;
+#endif

     }
   abort();
 }
 
 // Mandatory error function
 void
     }
   abort();
 }
 
 // Mandatory error function
 void

-yy::parser::error(const yy::parser::location_type& yylloc,
-                  const std::string& message)
+yy::parser::error(const yy::parser::location_type& loc, const std::string& msg)

 {
 {

-  std::cerr << yylloc << ": " << message << std::endl;
+  std::cerr << loc << ": " << msg << std::endl;

 }
 
 int main(int argc, char *argv[])
 }
 
 int main(int argc, char *argv[])


@@ -671,12 +764,12 @@ Generate F<$base.y> by calling C<&generate_grammar_$name>.
 sub generate_grammar ($$@)
 {
   my ($name, $base, @directive) = @_;
 sub generate_grammar ($$@)
 {
   my ($name, $base, @directive) = @_;

-  verbose 2, "Generating $base.y\n";
+  verbose 3, "Generating $base.y\n";

   my %generator =
     (
       "calc"       => \&generate_grammar_calc,
   my %generator =
     (
       "calc"       => \&generate_grammar_calc,

+      "list"       => \&generate_grammar_list,

       "triangular" => \&generate_grammar_triangular,
       "triangular" => \&generate_grammar_triangular,

-      "variant"    => \&generate_grammar_variant,

     );
   &{$generator{$name}}($base, 200, @directive);
 }
     );
   &{$generator{$name}}($base, 200, @directive);
 }


@@ -692,7 +785,7 @@ Run, possibly verbosely, the shell C<$command>.
 sub run ($)
 {
   my ($command) = @_;
 sub run ($)
 {
   my ($command) = @_;

-  verbose 2, "$command\n";
+  verbose 3, "$command\n";

   system ("$command") == 0
     or die "$command failed";
 }
   system ("$command") == 0
     or die "$command failed";
 }


@@ -720,54 +813,41 @@ sub compile ($)
 
 ######################################################################
 
 
 ######################################################################
 

-=item C<bench_grammar ($gram, %bench)>
-
-Generate benches for C<$gram>.  C<$gram> should be C<calc> or
-C<triangle>.  C<%bench> is a hash of the form:
-
-  $name => @directive
+=item C<bench ($grammar, @token)>

 
 

-where C<$name> is the name of the bench, and C<@directive> are the
-Bison directive to use for this bench.  All the benches are compared
-against each other, repeated 50 times.
+Generate benches for the C<$grammar> and the directive specification
+given in the list of C<@token>.

 
 =cut
 
 
 =cut
 

-sub bench_grammar ($%)
+sub bench ($@)

 {
 {

-  my ($gram, %test) = @_;
-
+  my ($grammar, @token) = @_;

   use Benchmark qw (:all :hireswallclock);
 
   use Benchmark qw (:all :hireswallclock);
 

+  my @directive = parse (@token);
+

   # Set up the benches as expected by timethese.
   my %bench;
   # Set up the benches as expected by timethese.
   my %bench;

-  # For each bench, capture the size.
-  my %size;
-  # If there are no user specified directives, use an empty one.
-  @directive = ('')
-    unless @directive;
-  my %directive;

   # A counter of directive sets.
   my $count = 1;
   for my $d (@directive)
     {
   # A counter of directive sets.
   my $count = 1;
   for my $d (@directive)
     {

-      $directive{$count} = $d;
-      while (my ($name, $directives) = each %test)
-        {
-          $name = "$count-$name";
-          generate_grammar ($gram, $name, (@$directives, $d));
-          # Compile the executable.
-          compile ($name);
-          $bench{$name} = "system ('./$name');";
-          chop($size{$name} = `wc -c <$name`);
-        }
+      $bench{$count} = $d;
+      printf " %2d. %s\n", $count, join (' ', split ("\n", $d));

       $count++;
       $count++;

-    }
+    };

 
 

-  # Display the directives.
-  for my $d (sort keys %directive)
+  # For each bench, capture the size.
+  my %size;
+
+  while (my ($name, $directives) = each %bench)

     {
     {

-      printf " %2d. %s\n", $d, $directive{$d};
+      generate_grammar ($grammar, $name, $directives);
+      # Compile the executable.
+      compile ($name);
+      $bench{$name} = "system ('./$name');";
+      chop($size{$name} = `wc -c <$name`);

     }
 
   # Run the benches.
     }
 
   # Run the benches.


@@ -779,7 +859,7 @@ sub bench_grammar ($%)
   # shows only wallclock and the two children times.  'auto' (the
   # default) will act as 'all' unless the children times are both
   # zero, in which case it acts as 'noc'.  'none' prevents output.
   # shows only wallclock and the two children times.  'auto' (the
   # default) will act as 'all' unless the children times are both
   # zero, in which case it acts as 'noc'.  'none' prevents output.

-  verbose 2, "Running the benches for $gram\n";
+  verbose 3, "Running the benches for $grammar\n";

   my $res = timethese ($iterations, \%bench, 'nop');
 
   # Output the speed result.
   my $res = timethese ($iterations, \%bench, 'nop');
 
   # Output the speed result.


@@ -812,91 +892,170 @@ interfaces.
 
 sub bench_push_parser ()
 {
 
 sub bench_push_parser ()
 {

-  calc_input ('calc', 200);
-  bench_grammar
-    ('calc',
-     (
-      "pull-impure" => [],
-      "pull-pure"   => ['%define api.pure'],
-      "push-impure" => ['%define api.push_pull "both"'],
-      "push-pure"   => ['%define api.push_pull "both"', '%define api.pure'],
-     )
-    );
+  bench ('calc',
+         qw(
+            [ %d api.pure ]
+            &
+            [ %d api.push-pull=both ]
+         ));

 }
 
 ######################################################################
 
 =item C<bench_variant_parser ()>
 
 }
 
 ######################################################################
 
 =item C<bench_variant_parser ()>
 

-Bench the C++ lalr1.cc parser using Boost.Variants or %union.
+Bench the C++ lalr1.cc parser using variants or %union.

 
 =cut
 
 sub bench_variant_parser ()
 {
 
 =cut
 
 sub bench_variant_parser ()
 {

-  bench_grammar
-    ('variant',
-     (
-      "f-union"         => ['%skeleton "lalr1.cc"'],
-      "f-uni-deb"   => ['%skeleton "lalr1.cc"', '%debug'],
-      "f-var"       => ['%skeleton "lalr1.cc"', '%define variant'],
-      "f-var-deb" => ['%skeleton "lalr1.cc"', '%debug', '%define variant'],
-      "f-var-dtr"       => ['%skeleton "lalr1.cc"', '%define variant', "%code {\n#define VARIANT_DESTROY\n}"],
-      "f-var-deb-dtr" => ['%skeleton "lalr1.cc"', '%debug', '%define variant', "%code {\n#define VARIANT_DESTROY\n}"],
-      "f-var-deb-dtr-ass" => ['%skeleton "lalr1.cc"', '%debug', '%define variant', "%code {\n#define VARIANT_DESTROY\n}", "%define assert"],
-     )
+  bench ('list',
+         qw(
+            [
+              %d variant
+              &
+              [ #d ONE_STAGE_BUILD | %d lex_symbol ]
+            ]
+         )

     );
 }
 
     );
 }
 

-######################################################################
-
-=item C<bench_fusion_parser ()>
-
-Bench the C++ lalr1.cc parser using Boost.Variants or %union.
-
-=cut
+############################################################################

 
 

-sub bench_fusion_parser ()
+sub help ($)

 {
 {

-  bench_grammar
-    ('variant',
-     (
-      "split"         => ['%skeleton "lalr1-split.cc"'],
-      "fused"         => ['%skeleton "lalr1.cc"'],
-     )
-    );
+  my ($verbose) = @_;
+  use Pod::Usage;
+  # See <URL:http://perldoc.perl.org/pod2man.html#NOTES>.
+  pod2usage( { -message => "Bench Bison parsers",
+               -exitval => 0,
+               -verbose => $verbose,
+               -output  => \*STDOUT });

 }
 
 ######################################################################
 
 }
 
 ######################################################################
 

-=item C<bench_list_parser ()>
+# The end of the directives to parse.
+my $eod = "end of directives";
+# The list of tokens parsed by the following functions.
+my @token;

 
 

-Bench the "variant" grammar with debug and no-debug.
+# eat ($EXPECTED)
+# ---------------
+# Check that the current token is $EXPECTED, and move to the next.
+sub eat ($)
+{
+  my ($expected) = @_;
+  die "expected $expected, unexpected: $token[0] (@token)\n"
+    unless $token[0] eq $expected;
+  shift @token;
+}

 
 

-=cut
+# Parse directive specifications:
+#   expr: term (| term)*
+#   term: fact (& fact)*
+#   fact: ( expr ) | [ expr ] | dirs
+#   dirs: %s SKELETON | #d NAME[=VALUE] | %d NAME[=VALUE] | directive
+sub parse (@)
+{
+  @token = (@_, $eod);
+  verbose 3, "Parsing: @token\n";
+  my @res = parse_expr ();
+  eat ($eod);
+  return @res;
+}

 
 

-sub bench_list_parser ()
+sub parse_expr ()

 {
 {

-  bench_grammar
-    ('variant',
-     (
-      "nodbd"  => [''],
-      "debug"  => ['%debug'],
-     )
-    );
+  my @res = parse_term ();
+  while ($token[0] eq '|')
+    {
+      eat ('|');
+      # Alternation.
+      push @res, parse_term ();
+    }
+  return @res;

 }
 
 }
 

-############################################################################
+sub parse_term ()
+{
+  my @res = parse_fact ();
+  while ($token[0] eq '&')
+    {
+      eat ('&');
+      # Cartesian product.
+      my @lhs = @res;
+      @res = ();
+      for my $rhs (parse_fact ())
+        {
+          for my $lhs (@lhs)
+            {
+              push @res, $lhs . ($lhs && $rhs ? "\n" : "") . $rhs;
+            }
+        }
+    }
+  return @res;
+}

 
 

-sub help ($)
+sub parse_fact ()

 {
 {

-  my ($verbose) = @_;
-  use Pod::Usage;
-  # See <URL:http://perldoc.perl.org/pod2man.html#NOTES>.
-  pod2usage( { -message => "Bench Bison parsers",
-               -exitval => 0,
-               -verbose => $verbose,
-               -output  => \*STDOUT });
+  my @res;
+  die "unexpected end of expression"
+    unless defined $token[0];
+
+  if ($token[0] eq '(')
+    {
+      eat ('(');
+      @res = parse_expr ();
+      eat (')');
+    }
+  elsif ($token[0] eq '[')
+    {
+      eat ('[');
+      @res = (parse_expr (), '');
+      eat (']');
+    }
+  else
+    {
+      @res = parse_dirs ();
+    }
+  return @res;
+}
+
+sub parse_dirs ()
+{
+  my @res;
+  die "unexpected end of expression"
+    unless defined $token[0];
+
+  if ($token[0] eq '#d')
+    {
+      eat ('#d');
+      $token[0] =~ s/(.*?)=(.*)/$1 $2/;
+      @res = ("%code {\n#define $token[0]\n}");
+      shift @token;
+    }
+  elsif ($token[0] eq '%d')
+    {
+      shift @token;
+      $token[0] =~ s/(.*?)=(.*)/$1 "$2"/;
+      @res = ("%define $token[0]");
+      shift @token;
+    }
+  elsif ($token[0] eq '%s')
+    {
+      shift @token;
+      @res = ("%skeleton \"$token[0]\"");
+      shift @token;
+    }
+  else
+    {
+      @res = $token[0];
+      shift @token;
+    }
+
+  return @res;

 }
 
 ######################################################################
 }
 
 ######################################################################


@@ -905,8 +1064,10 @@ sub getopt ()
 {
   use Getopt::Long;
   my %option = (
 {
   use Getopt::Long;
   my %option = (

+    "b|bench=s"      => \$bench,

     "c|cflags=s"     => \$cflags,
     "d|directive=s"  => \@directive,
     "c|cflags=s"     => \$cflags,
     "d|directive=s"  => \@directive,

+    "g|grammar=s"    => \$grammar,

     "h|help"         => sub { help ($verbose) },
     "i|iterations=i" => \$iterations,
     "q|quiet"        => sub { --$verbose },
     "h|help"         => sub { help ($verbose) },
     "i|iterations=i" => \$iterations,
     "q|quiet"        => sub { --$verbose },


@@ -920,18 +1081,46 @@ sub getopt ()
 ######################################################################
 
 getopt;
 ######################################################################
 
 getopt;

+
+# Create the directory we work in.
+mkdir "benches" or die "cannot create benches"
+  unless -d "benches";
+my $count = 1;
+++$count
+  while -d "benches/$count";
+my $dir = "benches/$count";
+mkdir $dir
+  or die "cannot create $dir";
+chdir $dir
+  or die "cannot chdir $dir";
+
+# The following message is tailored to please Emacs' compilation-mode.
+verbose 1, "Entering directory `$dir'\n";

 verbose 1, "Using bison=$bison.\n";
 verbose 1, "Using bison=$bison.\n";

-verbose 1, "Using cc=$cc.\n";
-verbose 1, "Using cxx=$cxx.\n";
-verbose 1, "Using cflags=$cflags.\n";
+verbose 2, "Using cc=$cc.\n";
+verbose 2, "Using cxx=$cxx.\n";
+verbose 2, "Using cflags=$cflags.\n";
+verbose 2, "Grammar: $grammar\n";

 
 

-for my $b (@ARGV)
+
+# Support -b: predefined benches.
+my %bench =
+  (
+   "push"     => \&bench_push_parser,
+   "variant"  => \&bench_variant_parser,
+  );
+
+if (defined $bench)
+{
+  die "invalid argument for --bench: $bench"
+    unless defined $bench{$bench};
+  &{$bench{$bench}}();
+  exit 0;
+}
+else

 {
 {

-  verbose 1, "Running benchmark $b.\n";
-  bench_fusion_parser()  if $b eq "fusion";
-  bench_list_parser()    if $b eq "list";
-  bench_push_parser()    if $b eq "push";
-  bench_variant_parser() if $b eq "variant";
+  # Launch the bench marking.
+  bench ($grammar, @ARGV);

 }
 
 ### Setup "GNU" style for perl-mode and cperl-mode.
 }
 
 ### Setup "GNU" style for perl-mode and cperl-mode.