etc/bench.pl.in

   1 #! /usr/bin/perl -w
   2
   3 # Copyright (C) 2006, 2008 Free Software Foundation, Inc.
   4 #
   5 # This file is part of Bison, the GNU Compiler Compiler.
   6 #
   7 # This program is free software: you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation, either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 =head1 NAME
  21
  22 bench.pl - perform benches on Bison parsers.
  23
  24 =head1 SYNOPSIS
  25
  26   ./bench.pl
  27
  28 =head1 OPTIONS
  29
  30 =item B<-c>, B<--cflags>=I<flags>
  31
  32 Flags to pass to the C or C++ compiler.
  33
  34 =item B<-i>, B<--iterations>=I<integer>
  35
  36 Say how many times a single test of the bench must be run.
  37
  38 =item B<-v>, B<--verbose>
  39
  40 Raise the verbosity level.  Currently only affects B<--help>.
  41
  42 =cut
  43
  44 use IO::File;
  45 use Benchmark qw (:all);
  46
  47 my $bison = $ENV{'BISON'} || '@abs_top_builddir@/tests/bison';
  48 my $cc = $ENV{'CC'} || 'gcc';
  49 my $cxx = $ENV{'CXX'} || 'g++';
  50 # Compiler flags (C or C++).
  51 my $cflags = '';
  52 # The number of times the parser is run for a bench.
  53 my $iterations = 50;
  54
  55 ##################################################################
  56
  57 =head1 DESCRIPTIONS
  58
  59 =head2 Functions
  60
  61 =over 4
  62
  63 =item C<directives($bench, @directive)>
  64
  65 Format the list of directives for Bison for bench named C<$bench>.
  66
  67 The special fake C<%variant> directive requests the use of
  68 Boost.Variants instead of a regular union.  So don't pass it, it is
  69 not a valid directive.
  70
  71 =cut
  72
  73 sub directives($@)
  74 {
  75   my ($bench, @directives) = @_;
  76   my $res = "/* Directives for bench `$bench'. */\n";
  77   for my $d (@directives)
  78     {
  79       $res .= $d . "\n"
  80         unless $d eq '%variant';
  81     }
  82   $res .= "/* End of directives for bench `$bench'. */\n";
  83   return $res;
  84 }
  85
  86 =item C<triangular_grammar ($base, $max, @directives)>
  87
  88 Create a large triangular grammar which looks like :
  89
  90   input:
  91     exp        { if ($1 != 0) abort (); $$ = $1; }
  92   | input exp  { if ($2 != $1 + 1) abort (); $$ = $2; }
  93   ;
  94
  95   exp:
  96     END                         { $$ = 0; }
  97   | "1"  END                    { $$ = 1; }
  98   | "1" "2"  END                { $$ = 2; }
  99   | "1" "2" "3"  END            { $$ = 3; }
 100   | "1" "2" "3" "4"  END        { $$ = 4; }
 101   | "1" "2" "3" "4" "5"  END    { $$ = 5; }
 102   ;
 103
 104 C<$base> is the base name for the file to create (F<$base.y>).
 105 C<$max> is the number of such rules (here, 5).  You may pass
 106 additional Bison C<@directives>.
 107
 108 The created parser is self contained: it includes its scanner, and
 109 source of input.
 110 =cut
 111
 112 sub triangular_grammar ($$$)
 113 {
 114   my ($base, $max, @directives) = @_;
 115   my $directives = directives ($base, @directives);
 116
 117   my $out = new IO::File ">$base.y"
 118     or die;
 119   print $out <<EOF;
 120 %error-verbose
 121 %debug
 122 %{
 123 #include <stdio.h>
 124 #include <stdlib.h>
 125
 126 static int yylex (void);
 127 static void yyerror (const char *msg);
 128 %}
 129 $directives
 130 %union
 131 {
 132   int val;
 133 };
 134
 135 %token END "end"
 136 %type <val> exp input
 137 EOF
 138
 139   for my $size (1 .. $max)
 140     {
 141       print $out "%token t$size $size \"$size\"\n";
 142     };
 143
 144 print $out <<EOF;
 145 %%
 146 input:
 147   exp        { if (\$1 != 0) abort (); \$\$ = \$1; }
 148 | input exp  { if (\$2 != \$1 + 1) abort (); \$\$ = \$2; }
 149 ;
 150
 151 exp:
 152   END
 153     { \$\$ = 0; }
 154 EOF
 155
 156 for my $size (1 .. $max)
 157   {
 158     use Text::Wrap;
 159     print $out wrap ("| ", "   ",
 160                      (map { "\"$_\"" } (1 .. $size)),
 161                      " END \n"),
 162                "    { \$\$ = $size; }\n";
 163   };
 164 print $out ";\n";
 165
 166 print $out <<EOF;
 167 %%
 168 static int
 169 yylex (void)
 170 {
 171   static int inner = 1;
 172   static int outer = 0;
 173   if (outer > $max)
 174     return 0;
 175   else if (inner > outer)
 176     {
 177       inner = 1;
 178       ++outer;
 179       return END;
 180     }
 181   return inner++;
 182 }
 183
 184 static void
 185 yyerror (const char *msg)
 186 {
 187   fprintf (stderr, "%s\\n", msg);
 188 }
 189
 190 int
 191 main (void)
 192 {
 193   yydebug = !!getenv ("YYDEBUG");
 194   return yyparse ();
 195 }
 196 EOF
 197 }
 198
 199 ##################################################################
 200
 201 =item C<calc_input ($base, $max)>
 202
 203 Generate the input file F<$base.input> for the calc parser.  The input
 204 is composed of two expressions.  The first one is using left recursion
 205 only and consumes no stack.  The second one requires a deep stack.
 206 These two expressions are repeated C<$max> times in the output file.
 207
 208 =cut
 209
 210 sub calc_input ($$)
 211 {
 212   my ($base, $max) = @_;
 213   my $out = new IO::File ">$base.input"
 214     or die;
 215   foreach (1 .. $max)
 216     {
 217       print $out "0+1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50+51+52+53+54+55+56+57+58+59+60+61+62+63+64+65+66+67+68+69+70+71+72+73+74+75+76+77+78+79+80+81+82+83+84+85+86+87+88+89+90+91+92+93+94+95+96+97+98+99\n";
 218       print $out "1+1*(2+2*(3+3*(4+4*(5+5*(6+6*(7+7*(8+8*(9+9*(10+10*(11+11*(12+12*(13+13*(14+14*(15+15*(16+16*(17+17*(18+18*(19+19*(20+20*(21+21*(22+22*(23+23*(24+24*(25+25*(26+26*(27+27*(28+28*(29+29*(30+30*(31+31*(32+32*(33+33*(34+34*(35+35*(36+36*(37+37*(38+38*(39+39*(40+40*(41+41*(42+42*(43+43*(44+44*(45+45*(46+46*(47+47*(48+48*(49+49*(50+50*(51+51*(52+52*(53+53*(54+54*(55+55*(56+56*(57+57*(58+58*(59+59*(60+60*(61+61*(62+62*(63+63*(64+64*(65+65*(66+66*(67+67*(68+68*(69+69*(70+70*(71+71*(72+72*(73+73*(74+74*(75+75*(76+76*(77+77*(78+78*(79+79*(80+80*(81+81*(82+82*(83+83*(84+84*(85+85*(86+86*(87+87*(88+88*(89+89*(90+90*(91+91*(92+92*(93+93*(94+94*(95+95*(96+96*(97+97*(98+98*(99+99*(100+100*(101+101*(102+102*(103+103*(104+104*(105+105*(106+106*(107+107*(108+108*(109+109*(110+110*(111+111*(112+112*(113+113*(114+114*(115+115*(116+116*(117+117*(118+118*(119+119*(120+120*(121+121*(122+122*(123+123*(124+124*(125+125*(126+126*(127+127*(128+128*(129+129*(130+130*(131+131*(132+132*(133+133*(134+134*(135+135*(136+136*(137+137*(138+138*(139+139*(140+140*(141+141*(142+142*(143+143*(144+144*(145+145*(146+146*(147+147*(148+148*(149+149*(150+150*(151+151*(152+152*(153+153*(154+154*(155+155*(156+156*(157+157*(158+158*(159+159*(160+160*(161+161*(162+162*(163+163*(164+164*(165+165*(166+166*(167+167*(168+168*(169+169*(170+170*(171+171*(172+172*(173+173*(174+174*(175+175*(176+176*(177+177*(178+178*(179+179*(180+180*(181+181*(182+182*(183+183*(184+184*(185+185*(186+186*(187+187*(188+188*(189+189*(190+190*(191+191*(192+192*(193+193*(194+194*(195+195*(196+196*(197+197*(198+198*(199+199*(200+200*(201+201*(202+202*(203+203*(204+204*(205+205*(206+206*(207+207*(208+208*(209+209*(210+210*(211+211*(212+212*(213+213*(214+214*(215+215*(216+216*(217+217*(218+218*(219+219*(220+220*(221+221*(222+222*(223+223*(224+224*(225+225*(226+226*(227+227*(228+228*(229+229*(230+230*(231+231*(232+232*(233+233*(234+234*(235+235*(236+236*(237+237*(238+238*(239+239*(240+240*(241+241*(242+242*(243+243*(244+244*(245+245*(246+246*(247+247*(248+248*(249+249*(250+250*(251+251*(252+252*(253+253*(254+254*(255+255*(256+256*(257+257*(258+258*(259+259*(260+260*(261+261*(262+262*(263+263*(264+264*(265+265*(266+266*(267+267*(268+268*(269+269*(270+270*(271+271*(272+272*(273+273*(274+274*(275+275*(276+276*(277+277*(278+278*(279+279*(280+280*(281+281*(282+282*(283+283*(284+284*(285+285*(286+286*(287+287*(288+288*(289+289*(290+290*(291+291*(292+292*(293+293*(294+294*(295+295*(296+296*(297+297*(298+298*(299+299*(300+300*(301+301*(302+302*(303+303*(304+304*(305+305*(306+306*(307+307*(308+308*(309+309*(310+310*(311+311*(312+312*(313+313*(314+314*(315+315*(316+316*(317+317*(318+318*(319+319*(320+320*(321+321*(322+322*(323+323*(324+324*(325+325*(326+326*(327+327*(328+328*(329+329*(330+330*(331+331*(332+332*(333+333*(334+334*(335+335*(336+336*(337+337*(338+338*(339+339*(340+340*(341+341*(342+342*(343+343*(344+344*(345+345*(346+346*(347+347*(348+348*(349+349*(350+350*(351+351*(352+352*(353+353*(354+354*(355+355*(356+356*(357+357*(358+358*(359+359*(360+360*(361+361*(362+362*(363+363*(364+364*(365+365*(366+366*(367+367*(368+368*(369+369*(370+370*(371+371*(372+372*(373+373*(374+374*(375+375*(376+376*(377+377*(378+378*(379+379*(380+380*(381+381*(382+382*(383+383*(384+384*(385+385*(386+386*(387+387*(388+388*(389+389*(390+390*(391+391*(392+392*(393+393*(394+394*(395+395*(396+396*(397+397*(398+398*(399+399*(400+400*(401+401*(402+402*(403+403*(404+404*(405+405*(406+406*(407+407*(408+408*(409+409*(410+410*(411+411*(412+412*(413+413*(414+414*(415+415*(416+416*(417+417*(418+418*(419+419*(420+420*(421+421*(422+422*(423+423*(424+424*(425+425*(426+426*(427+427*(428+428*(429+429*(430+430*(431+431*(432+432*(433+433*(434+434*(435+435*(436+436*(437+437*(438+438*(439+439*(440+440*(441+441*(442+442*(443+443*(444+444*(445+445*(446+446*(447+447*(448+448*(449+449*(450+450*(451+451*(452+452*(453+453*(454+454*(455+455*(456+456*(457+457*(458+458*(459+459*(460+460*(461+461*(462+462*(463+463*(464+464*(465+465*(466+466*(467+467*(468+468*(469+469*(470+470*(471+471*(472+472*(473+473*(474+474*(475+475*(476+476*(477+477*(478+478*(479+479*(480+480*(481+481*(482+482*(483+483*(484+484*(485+485*(486+486*(487+487*(488+488*(489+489*(490+490*(491+491*(492+492*(493+493*(494+494*(495+495*(496+496*(497+497*(498+498*(499+499*(500+500*(501+501*(502+502*(503+503*(504+504*(505+505*(506+506*(507+507*(508+508*(509+509*(510+510*(511+511*(512+512*(513+513*(514+514*(515+515*(516+516*(517+517*(518+518*(519+519*(520+520*(521+521*(522+522*(523+523*(524+524*(525+525*(526+526*(527+527*(528+528*(529+529*(530+530*(531+531*(532+532*(533+533*(534+534*(535+535*(536+536*(537+537*(538+538*(539+539*(540+540*(541+541*(542+542*(543+543*(544+544*(545+545*(546+546*(547+547*(548+548*(549+549*(550+550*(551+551*(552+552*(553+553*(554+554*(555+555*(556+556*(557+557*(558+558*(559+559*(560+560*(561+561*(562+562*(563+563*(564+564*(565+565*(566+566*(567+567*(568+568*(569+569*(570+570*(571+571*(572+572*(573+573*(574+574*(575+575*(576+576*(577+577*(578+578*(579+579*(580+580*(581+581*(582+582*(583+583*(584+584*(585+585*(586+586*(587+587*(588+588*(589+589*(590+590*(591+591*(592+592*(593+593*(594+594*(595+595*(596+596*(597+597*(598+598*(599+599*(600+600*(601+601*(602+602*(603+603*(604+604*(605+605*(606+606*(607+607*(608+608*(609+609*(610+610*(611+611*(612+612*(613+613*(614+614*(615+615*(616+616*(617+617*(618+618*(619+619*(620+620*(621+621*(622+622*(623+623*(624+624*(625+625*(626+626*(627+627*(628+628*(629+629*(630+630*(631+631*(632+632*(633+633*(634+634*(635+635*(636+636*(637+637*(638+638*(639+639*(640+640*(641+641*(642+642*(643+643*(644+644*(645+645*(646+646*(647+647*(648+648*(649+649*(650+650*(651+651*(652+652*(653+653*(654+654*(655+655*(656+656*(657+657*(658+658*(659+659*(660+660*(661+661*(662+662*(663+663*(664+664*(665+665*(666+666*(667+667*(668+668*(669+669*(670+670*(671+671*(672+672*(673+673*(674+674*(675+675*(676+676*(677+677*(678+678*(679+679*(680+680*(681+681*(682+682*(683+683*(684+684*(685+685*(686+686*(687+687*(688+688*(689+689*(690+690*(691+691*(692+692*(693+693*(694+694*(695+695*(696+696*(697+697*(698+698*(699+699*(700+700*(701+701*(702+702*(703+703*(704+704*(705+705*(706+706*(707+707*(708+708*(709+709*(710+710*(711+711*(712+712*(713+713*(714+714*(715+715*(716+716*(717+717*(718+718*(719+719*(720+720*(721+721*(722+722*(723+723*(724+724*(725+725*(726+726*(727+727*(728+728*(729+729*(730+730*(731+731*(732+732*(733+733*(734+734*(735+735*(736+736*(737+737*(738+738*(739+739*(740+740*(741+741*(742+742*(743+743*(744+744*(745+745*(746+746*(747+747*(748+748*(749+749*(750+750*(751+751*(752+752*(753+753*(754+754*(755+755*(756+756*(757+757*(758+758*(759+759*(760+760*(761+761*(762+762*(763+763*(764+764*(765+765*(766+766*(767+767*(768+768*(769+769*(770+770*(771+771*(772+772*(773+773*(774+774*(775+775*(776+776*(777+777*(778+778*(779+779*(780+780*(781+781*(782+782*(783+783*(784+784*(785+785*(786+786*(787+787*(788+788*(789+789*(790+790*(791+791*(792+792*(793+793*(794+794*(795+795*(796+796*(797+797*(798+798*(799+799*(800+800*(801+801*(802+802*(803+803*(804+804*(805+805*(806+806*(807+807*(808+808*(809+809*(810+810*(811+811*(812+812*(813+813*(814+814*(815+815*(816+816*(817+817*(818+818*(819+819*(820+820*(821+821*(822+822*(823+823*(824+824*(825+825*(826+826*(827+827*(828+828*(829+829*(830+830*(831+831*(832+832*(833+833*(834+834*(835+835*(836+836*(837+837*(838+838*(839+839*(840+840*(841+841*(842+842*(843+843*(844+844*(845+845*(846+846*(847+847*(848+848*(849+849*(850+850*(851+851*(852+852*(853+853*(854+854*(855+855*(856+856*(857+857*(858+858*(859+859*(860+860*(861+861*(862+862*(863+863*(864+864*(865+865*(866+866*(867+867*(868+868*(869+869*(870+870*(871+871*(872+872*(873+873*(874+874*(875+875*(876+876*(877+877*(878+878*(879+879*(880+880*(881+881*(882+882*(883+883*(884+884*(885+885*(886+886*(887+887*(888+888*(889+889*(890+890*(891+891*(892+892*(893+893*(894+894*(895+895*(896+896*(897+897*(898+898*(899+899*(900+900*(901+901*(902+902*(903+903*(904+904*(905+905*(906+906*(907+907*(908+908*(909+909*(910+910*(911+911*(912+912*(913+913*(914+914*(915+915*(916+916*(917+917*(918+918*(919+919*(920+920*(921+921*(922+922*(923+923*(924+924*(925+925*(926+926*(927+927*(928+928*(929+929*(930+930*(931+931*(932+932*(933+933*(934+934*(935+935*(936+936*(937+937*(938+938*(939+939*(940+940*(941+941*(942+942*(943+943*(944+944*(945+945*(946+946*(947+947*(948+948*(949+949*(950+950*(951+951*(952+952*(953+953*(954+954*(955+955*(956+956*(957+957*(958+958*(959+959*(960+960*(961+961*(962+962*(963+963*(964+964*(965+965*(966+966*(967+967*(968+968*(969+969*(970+970*(971+971*(972+972*(973+973*(974+974*(975+975*(976+976*(977+977*(978+978*(979+979*(980+980*(981+981*(982+982*(983+983*(984+984*(985+985*(986+986*(987+987*(988+988*(989+989*(990+990*(991+991*(992+992*(993+993*(994+994*(995+995*(996+996*(997+997*(998+998*(999+999*(1000+1000*(1001))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))\n";
 219     }
 220 }
 221
 222 ##################################################################
 223 =item C<calc_grammar ($base, $max, @directives)>
 224
 225 Generate a Bison file F<$base.y> for a calculator parser in C.  Pass
 226 the additional Bison C<@directives>.  C<$max> is ignored, but left to
 227 have the same interface as C<triangular_grammar>.
 228
 229 =cut
 230
 231 sub calc_grammar ($$$)
 232 {
 233   my ($base, $max, @directives) = @_;
 234   my $directives = directives ($base, @directives);
 235
 236   my $out = new IO::File ">$base.y"
 237     or die;
 238   print $out <<EOF;
 239 %{
 240 #include <stdio.h>
 241
 242 #include <stdlib.h>
 243 #include <string.h>
 244 #include <ctype.h>
 245 #define USE(Var)
 246
 247 /* Exercise pre-prologue dependency to %union.  */
 248 typedef int semantic_value;
 249
 250 static semantic_value global_result = 0;
 251 static int global_count = 0;
 252 %}
 253
 254 $directives
 255 %error-verbose
 256 /* Exercise %union. */
 257 %union
 258 {
 259   semantic_value ival;
 260 };
 261
 262 %{
 263 static int power (int base, int exponent);
 264 /* yyerror receives the location if:
 265    - %location & %pure & %glr
 266    - %location & %pure & %yacc & %parse-param. */
 267 static void yyerror (const char *s);
 268 #if YYPURE
 269 static int yylex (YYSTYPE* yylvalp);
 270 #else
 271 static int yylex (void);
 272 #endif
 273 %}
 274
 275 /* Bison Declarations */
 276 %token CALC_EOF 0 "end of input"
 277 %token <ival> NUM "number"
 278 %type  <ival> exp
 279
 280 %nonassoc '=' /* comparison            */
 281 %left '-' '+'
 282 %left '*' '/'
 283 %left NEG     /* negation--unary minus */
 284 %right '^'    /* exponentiation        */
 285
 286 /* Grammar follows */
 287 %%
 288 input:
 289   line
 290 | input line
 291 ;
 292
 293 line:
 294   '\\n'
 295 | exp '\\n'           { USE (\$1); }
 296 ;
 297
 298 exp:
 299   NUM                { \$\$ = \$1;             }
 300 | exp '=' exp
 301   {
 302     if (\$1 != \$3)
 303       fprintf (stderr, "calc: error: %d != %d\\n", \$1, \$3);
 304     \$\$ = \$1;
 305   }
 306 | exp '+' exp        { \$\$ = \$1 + \$3;        }
 307 | exp '-' exp        { \$\$ = \$1 - \$3;        }
 308 | exp '*' exp        { \$\$ = \$1 * \$3;        }
 309 | exp '/' exp        { \$\$ = \$1 / \$3;        }
 310 | '-' exp  %prec NEG { \$\$ = -\$2;            }
 311 | exp '^' exp        { \$\$ = power (\$1, \$3); }
 312 | '(' exp ')'        { \$\$ = \$2;             }
 313 | '(' error ')'      { \$\$ = 1111;           }
 314 | '!'                { \$\$ = 0; YYERROR;     }
 315 | '-' error          { \$\$ = 0; YYERROR;     }
 316 ;
 317 %%
 318 /* The input.  */
 319 static FILE *input;
 320
 321 static void
 322 yyerror (const char *s)
 323 {
 324   fprintf (stderr, "%s\\n", s);
 325 }
 326
 327 static int
 328 get_char (void)
 329 {
 330   return getc (input);
 331 }
 332
 333
 334 static void
 335 unget_char ( int c)
 336 {
 337   ungetc (c, input);
 338 }
 339
 340 static int
 341 read_signed_integer (void)
 342 {
 343   int c = get_char ();
 344   int sign = 1;
 345   int n = 0;
 346
 347   if (c == '-')
 348     {
 349       c = get_char ();
 350       sign = -1;
 351     }
 352
 353   while (isdigit (c))
 354     {
 355       n = 10 * n + (c - '0');
 356       c = get_char ();
 357     }
 358
 359   unget_char (c);
 360
 361   return sign * n;
 362 }
 363
 364 static int
 365 #if YYPURE
 366 # define yylval (*yylvalp)
 367 yylex (YYSTYPE* yylvalp)
 368 #else
 369 yylex (void)
 370 #endif
 371 {
 372   int c;
 373
 374   /* Skip white space.  */
 375   while ((c = get_char ()) == ' ' || c == '\t')
 376     continue;
 377
 378   /* process numbers   */
 379   if (c == '.' || isdigit (c))
 380     {
 381       unget_char ( c);
 382       yylval.ival = read_signed_integer ();
 383       return NUM;
 384     }
 385
 386   /* Return end-of-file.  */
 387   if (c == EOF)
 388     return CALC_EOF;
 389
 390   /* Return single chars. */
 391   return c;
 392 }
 393
 394 static int
 395 power (int base, int exponent)
 396 {
 397   int res = 1;
 398   if (exponent < 0)
 399     exit (3);
 400   for (/* Niente */; exponent; --exponent)
 401     res *= base;
 402   return res;
 403 }
 404
 405
 406 int
 407 main (int argc, const char **argv)
 408 {
 409   semantic_value result = 0;
 410   int count = 0;
 411   int status;
 412
 413   input = fopen ("calc.input", "r");
 414   if (!input)
 415     {
 416       perror ("calc.input");
 417       return 3;
 418     }
 419
 420   status = yyparse ();
 421   if (global_result != result)
 422     abort ();
 423   if (global_count != count)
 424     abort ();
 425
 426   return status;
 427 }
 428 EOF
 429 }
 430
 431 ##################################################################
 432
 433 =item C<variant_grammar ($base, $max, @directives)>
 434
 435 Generate a Bison file F<$base.y> that uses, or not, the Boost.Variants
 436 depending on the C<@directives>.
 437
 438 =cut
 439
 440 sub variant_grammar ($$$)
 441 {
 442   my ($base, $max, @directives) = @_;
 443   my $directives = directives ($base, @directives);
 444   my $variant = grep { '%variant' } @directives;
 445
 446   my $out = new IO::File ">$base.y"
 447     or die;
 448   print $out <<EOF;
 449 %debug
 450 %language "C++"
 451 %defines
 452
 453 %code requires // code for the .hh file
 454 {
 455 #include <string>
 456 }
 457
 458 %code // code for the .cc file
 459 {
 460 #include <algorithm>
 461 #include <iostream>
 462 #include <sstream>
 463
 464 // Prototype of the yylex function providing subsequent tokens.
 465 static yy::parser::token_type yylex(yy::parser::semantic_type* yylval);
 466
 467 #define STAGE_MAX    ($max * 10)
 468 #define USE_VARIANTS $variant
 469 #if USE_VARIANTS
 470 # define IF_VARIANTS(True, False) True
 471 #else
 472 # define IF_VARIANTS(True, False) False
 473 #endif
 474 }
 475 EOF
 476
 477   if ($variant)
 478     {
 479       print $out <<'EOF';
 480 %code variant {int,std::string}
 481 %token <std::string> TEXT
 482 %token <int> NUMBER
 483 %printer { std::cerr << "Number: " << $$; } <int>
 484 %printer { std::cerr << "Text: " << $$; } <std::string>
 485 %token END_OF_FILE 0
 486 %type <std::string> text result
 487
 488 %%
 489 result:
 490   text                  { /* Throw away the result. */ }
 491 ;
 492
 493 text:
 494   /* nothing */         { /* This will generate an empty string */ }
 495 | text TEXT             { std::swap($$,$1); $$.append($2); }
 496 | text NUMBER           {
 497                           std::swap($$,$1);
 498                           std::ostringstream ss;
 499                           ss << ' ' << $2;
 500                           $$.append(ss.str());
 501                          }
 502 ;
 503 EOF
 504     }
 505   else
 506     {
 507       # Not using Boost variants.
 508       print $out <<'EOF';
 509 %union {int ival; std::string* sval;}
 510 %token <sval> TEXT
 511 %token <ival> NUMBER
 512 %printer { std::cerr << "Number: " << $$; } <ival>
 513 %printer { std::cerr << "Text: " << *$$; } <sval>
 514 %token END_OF_FILE 0
 515 %type <sval> text result
 516
 517 %%
 518 result:
 519   text                  { delete $1; }
 520 ;
 521
 522 text:
 523   /* nothing */         { $$ = new std::string; }
 524 | text TEXT             { $$->append(*$2); delete $2; }
 525 | text NUMBER           {
 526                           std::ostringstream ss;
 527                           ss << ' ' << $2;
 528                           $$->append(ss.str());
 529                          }
 530 ;
 531 EOF
 532     }
 533
 534   print $out <<'EOF';
 535 %%
 536 static
 537 yy::parser::token_type
 538 yylex(yy::parser::semantic_type* yylval)
 539 {
 540   static int stage = -1;
 541   ++stage;
 542   if (stage == STAGE_MAX)
 543     return yy::parser::token::END_OF_FILE;
 544   else if (stage % 2)
 545     {
 546       IF_VARIANTS(*yylval, yylval->ival) = stage;
 547       return yy::parser::token::NUMBER;
 548     }
 549   else
 550     {
 551       IF_VARIANTS(*yylval =, yylval->sval = new) std::string("A string.");
 552       return yy::parser::token::TEXT;
 553     }
 554   abort();
 555 }
 556
 557 // Mandatory error function
 558 void
 559 yy::parser::error(const yy::parser::location_type& yylloc,
 560                   const std::string& message)
 561 {
 562   std::cerr << yylloc << ": " << message << std::endl;
 563 }
 564
 565 int main(int argc, char *argv[])
 566 {
 567   yy::parser p;
 568   p.set_debug_level(!!getenv("YYDEBUG"));
 569   p.parse();
 570   return 0;
 571 }
 572 EOF
 573 }
 574
 575 ##################################################################
 576
 577 =item C<compile ($base)>
 578
 579 Compile C<$base.y> to an executable C, Using the C or C++ compiler
 580 depending on the %language specification in C<$base.y>.
 581
 582 =cut
 583
 584 sub compile ($)
 585 {
 586   my ($base) = @_;
 587   my $language = `sed -ne '/%language "\\(.*\\)"/{s//\\1/;p;q;}' $base.y`;
 588   chomp $language;
 589
 590   my $compiler = $language eq 'C++' ? $cxx : $cc;
 591
 592   system ("$bison $base.y -o $base.c") == 0
 593     or die;
 594   system ("$compiler -o $base $cflags $base.c") == 0
 595     or die;
 596 }
 597
 598 =item C<bench_grammar ($gram, %bench)>
 599
 600 Generate benches for C<$gram>.  C<$gram> should be C<calc> or
 601 C<triangle>.  C<%bench> is a hash of the form:
 602
 603   $name => @directives
 604
 605 where C<$name> is the name of the bench, and C<@directives> are the
 606 Bison directive to use for this bench.  All the benches are compared
 607 against each other, repeated 50 times.
 608
 609 =cut
 610
 611 sub bench_grammar ($%)
 612 {
 613   my ($gram, %test) = @_;
 614
 615   # Set up the benches as expected by timethese.
 616   my %bench;
 617   while (my ($name, $directives) = each %test)
 618     {
 619       print STDERR "$name\n";
 620       # Call the Bison input file generator.
 621       my $generator = "$gram" . "_grammar";
 622       &$generator ($name, 200, @$directives);
 623       compile ($name);
 624       $bench{$name} = "system ('./$name');";
 625     }
 626
 627   print "$gram:\n";
 628   # Run the benches.
 629   my $res = timethese ($iterations, \%bench, 'nop');
 630   # Output the result.
 631   cmpthese ($res, 'nop');
 632 }
 633
 634
 635 =item C<bench_push_parser ()>
 636
 637 Bench the C push parser against the pull parser, pure and impure
 638 interfaces.
 639
 640 =cut
 641
 642 sub bench_push_parser ()
 643 {
 644   calc_input ('calc', 200);
 645   bench_grammar
 646     ('calc',
 647      (
 648       "pull-impure" => [],
 649       "pull-pure"   => ['%define api.pure'],
 650       "push-impure" => ['%define api.push_pull "both"'],
 651       "push-pure"   => ['%define api.push_pull "both"', '%define api.pure'],
 652      )
 653     );
 654 }
 655
 656 =item C<bench_variant_parser ()>
 657
 658 Bench the C++ lalr1.cc parser using Boost.Variants or %union.
 659
 660 =cut
 661
 662 sub bench_variant_parser ()
 663 {
 664   bench_grammar
 665     ('variant',
 666      (
 667       "union"    => [],
 668       "variant"  => ['%variant'],
 669      )
 670     );
 671 }
 672
 673 ############################################################################
 674
 675 sub help ($)
 676 {
 677   my ($verbose) = @_;
 678   use Pod::Usage;
 679   # See <URL:http://perldoc.perl.org/pod2man.html#NOTES>.
 680   pod2usage( { -message => "Bench Bison parsers",
 681                -exitval => 0,
 682                -verbose => $verbose,
 683                -output  => \*STDOUT });
 684 }
 685
 686 sub getopt ()
 687 {
 688   use Getopt::Long;
 689   my $verbose = 0;
 690   %option = ("h|help"     => sub { help ($verbose) },
 691              "v|verbose"  => sub { ++$verbose },
 692              "c|cflags=s" => \$cflags,
 693              "i|iterations=i" => \$iterations);
 694   Getopt::Long::Configure ("bundling", "pass_through");
 695   GetOptions (%option)
 696     or exit 1;
 697 }
 698
 699 ######################################################################
 700
 701 getopt;
 702 print STDERR "Using bison=$bison, cc=$cc, cxx=$cxx, cflags=$cflags.\n";
 703 # bench_push_parser();
 704 bench_variant_parser();
 705
 706 ### Setup "GNU" style for perl-mode and cperl-mode.
 707 ## Local Variables:
 708 ## perl-indent-level: 2
 709 ## perl-continued-statement-offset: 2
 710 ## perl-continued-brace-offset: 0
 711 ## perl-brace-offset: 0
 712 ## perl-brace-imaginary-offset: 0
 713 ## perl-label-offset: -2
 714 ## cperl-indent-level: 2
 715 ## cperl-brace-offset: 0
 716 ## cperl-continued-brace-offset: 0
 717 ## cperl-label-offset: -2
 718 ## cperl-extra-newline-before-brace: t
 719 ## cperl-merge-trailing-else: nil
 720 ## cperl-continued-statement-offset: 2
 721 ## End: