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 [OPTIONS]... BENCHES
  27
  28 =head1 BENCHES
  29
  30 Specify the set of benches to run.  I<bench-name> should be one of:
  31
  32 =over 4
  33
  34 =item I<fusion>
  35
  36 Test F<lalr1.cc> with three stacks against F<lalr1-fusion.cc> which
  37 uses a single one.
  38
  39 =item I<push>
  40
  41 Test the push parser vs. the pull interface.  Use the C parser.
  42
  43 =item I<variant>
  44
  45 Test the use of variants instead of union in the C++ parser.
  46
  47 =back
  48
  49 =head1 OPTIONS
  50
  51 =item B<-c>, B<--cflags>=I<flags>
  52
  53 Flags to pass to the C or C++ compiler.  Defaults to -O2.
  54
  55 =item B<-h>, B<--help>
  56
  57 Display this message and exit succesfully.  The more verbose, the more
  58 details.
  59
  60 =item B<-i>, B<--iterations>=I<integer>
  61
  62 Say how many times a single test of the bench must be run.  If
  63 negative, specify the minimum number of CPU seconds to run.  Defaults
  64 to -1.
  65
  66 =item B<-q>, B<--quiet>
  67
  68 Decrease the verbosity level (defaults to 1).
  69
  70 =item B<-v>, B<--verbose>
  71
  72 Raise the verbosity level (defaults to 1).
  73
  74 =back
  75
  76 =cut
  77
  78 use strict;
  79 use IO::File;
  80
  81 ##################################################################
  82
  83 =head1 VARIABLES
  84
  85 =over 4
  86
  87 =item C<@bench>
  88
  89 The list of benches to run.
  90
  91 =item C<$bison>
  92
  93 The Bison program to use to compile the grammar.
  94
  95 =item C<$cc>
  96
  97 The C compiler.
  98
  99 =item C<$cxx>
 100
 101 The C++ compiler.
 102
 103 =item C<$cflags>
 104
 105 Compiler flags (C or C++).
 106
 107 =item C<$iterations>
 108
 109 The number of times the parser is run for a bench.
 110
 111 =item C<$verbose>
 112
 113 Verbosity level.
 114
 115 =back
 116
 117 =cut
 118
 119 my $bison = $ENV{'BISON'} || '@abs_top_builddir@/tests/bison';
 120 my $cc = $ENV{'CC'} || 'gcc';
 121 my $cxx = $ENV{'CXX'} || 'g++';
 122 my $cflags = '-O2';
 123 my $iterations = -1;
 124 my $verbose = 1;
 125
 126 =head1 FUNCTIONS
 127
 128 =over 4
 129
 130 =item C<verbose($level, $message)>
 131
 132 Report the C<$message> is C<$level> E<lt>= C<$verbose>.
 133
 134 =cut
 135
 136 sub verbose($$)
 137 {
 138   my ($level, $message) = @_;
 139   print STDERR $message
 140     if $level <= $verbose;
 141 }
 142
 143
 144 ######################################################################
 145
 146 =item C<directives($bench, @directive)>
 147
 148 Format the list of directives for Bison for bench named C<$bench>.
 149
 150 =cut
 151
 152 sub directives($@)
 153 {
 154   my ($bench, @directive) = @_;
 155   my $res = "/* Directives for bench `$bench'. */\n";
 156   $res .= join ("\n", @directive) . "\n";
 157   $res .= "/* End of directives for bench `$bench'. */\n";
 158   return $res;
 159 }
 160
 161 ######################################################################
 162
 163 =item C<generate_grammar_triangular ($base, $max, @directive)>
 164
 165 Create a large triangular grammar which looks like :
 166
 167   input:
 168     exp        { if ($1 != 0) abort (); $$ = $1; }
 169   | input exp  { if ($2 != $1 + 1) abort (); $$ = $2; }
 170   ;
 171
 172   exp:
 173     END                         { $$ = 0; }
 174   | "1"  END                    { $$ = 1; }
 175   | "1" "2"  END                { $$ = 2; }
 176   | "1" "2" "3"  END            { $$ = 3; }
 177   | "1" "2" "3" "4"  END        { $$ = 4; }
 178   | "1" "2" "3" "4" "5"  END    { $$ = 5; }
 179   ;
 180
 181 C<$base> is the base name for the file to create (F<$base.y>).
 182 C<$max> is the number of such rules (here, 5).  You may pass
 183 additional Bison C<@directive>.
 184
 185 The created parser is self contained: it includes its scanner, and
 186 source of input.
 187 =cut
 188
 189 sub generate_grammar_triangular ($$@)
 190 {
 191   my ($base, $max, @directive) = @_;
 192   my $directives = directives ($base, @directive);
 193
 194   my $out = new IO::File ">$base.y"
 195     or die;
 196   print $out <<EOF;
 197 %error-verbose
 198 %debug
 199 %{
 200 #include <stdio.h>
 201 #include <stdlib.h>
 202
 203 static int yylex (void);
 204 static void yyerror (const char *msg);
 205 %}
 206 $directives
 207 %union
 208 {
 209   int val;
 210 };
 211
 212 %token END "end"
 213 %type <val> exp input
 214 EOF
 215
 216   for my $size (1 .. $max)
 217     {
 218       print $out "%token t$size $size \"$size\"\n";
 219     };
 220
 221 print $out <<EOF;
 222 %%
 223 input:
 224   exp        { if (\$1 != 0) abort (); \$\$ = \$1; }
 225 | input exp  { if (\$2 != \$1 + 1) abort (); \$\$ = \$2; }
 226 ;
 227
 228 exp:
 229   END
 230     { \$\$ = 0; }
 231 EOF
 232
 233 for my $size (1 .. $max)
 234   {
 235     use Text::Wrap;
 236     print $out wrap ("| ", "   ",
 237                      (map { "\"$_\"" } (1 .. $size)),
 238                      " END \n"),
 239                "    { \$\$ = $size; }\n";
 240   };
 241 print $out ";\n";
 242
 243 print $out <<EOF;
 244 %%
 245 static int
 246 yylex (void)
 247 {
 248   static int inner = 1;
 249   static int outer = 0;
 250   if (outer > $max)
 251     return 0;
 252   else if (inner > outer)
 253     {
 254       inner = 1;
 255       ++outer;
 256       return END;
 257     }
 258   return inner++;
 259 }
 260
 261 static void
 262 yyerror (const char *msg)
 263 {
 264   fprintf (stderr, "%s\\n", msg);
 265 }
 266
 267 int
 268 main (void)
 269 {
 270   yydebug = !!getenv ("YYDEBUG");
 271   return yyparse ();
 272 }
 273 EOF
 274 }
 275
 276 ##################################################################
 277
 278 =item C<calc_input ($base, $max)>
 279
 280 Generate the input file F<$base.input> for the calc parser.  The input
 281 is composed of two expressions.  The first one is using left recursion
 282 only and consumes no stack.  The second one requires a deep stack.
 283 These two expressions are repeated C<$max> times in the output file.
 284
 285 =cut
 286
 287 sub calc_input ($$)
 288 {
 289   my ($base, $max) = @_;
 290   my $out = new IO::File ">$base.input"
 291     or die;
 292   foreach (1 .. $max)
 293     {
 294       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";
 295       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";
 296     }
 297 }
 298
 299 ##################################################################
 300
 301 =item C<generate_grammar_calc ($base, $max, @directive)>
 302
 303 Generate a Bison file F<$base.y> for a calculator parser in C.  Pass
 304 the additional Bison C<@directive>.  C<$max> is ignored, but left to
 305 have the same interface as C<triangular_grammar>.
 306
 307 =cut
 308
 309 sub generate_grammar_calc ($$@)
 310 {
 311   my ($base, $max, @directive) = @_;
 312   my $directives = directives ($base, @directive);
 313
 314   my $out = new IO::File ">$base.y"
 315     or die;
 316   print $out <<EOF;
 317 %{
 318 #include <stdio.h>
 319
 320 #include <stdlib.h>
 321 #include <string.h>
 322 #include <ctype.h>
 323 #define USE(Var)
 324
 325 /* Exercise pre-prologue dependency to %union.  */
 326 typedef int semantic_value;
 327
 328 static semantic_value global_result = 0;
 329 static int global_count = 0;
 330 %}
 331
 332 $directives
 333 %error-verbose
 334 /* Exercise %union. */
 335 %union
 336 {
 337   semantic_value ival;
 338 };
 339
 340 %{
 341 static int power (int base, int exponent);
 342 /* yyerror receives the location if:
 343    - %location & %pure & %glr
 344    - %location & %pure & %yacc & %parse-param. */
 345 static void yyerror (const char *s);
 346 #if YYPURE
 347 static int yylex (YYSTYPE* yylvalp);
 348 #else
 349 static int yylex (void);
 350 #endif
 351 %}
 352
 353 /* Bison Declarations */
 354 %token CALC_EOF 0 "end of input"
 355 %token <ival> NUM "number"
 356 %type  <ival> exp
 357
 358 %nonassoc '=' /* comparison            */
 359 %left '-' '+'
 360 %left '*' '/'
 361 %left NEG     /* negation--unary minus */
 362 %right '^'    /* exponentiation        */
 363
 364 /* Grammar follows */
 365 %%
 366 input:
 367   line
 368 | input line
 369 ;
 370
 371 line:
 372   '\\n'
 373 | exp '\\n'           { USE (\$1); }
 374 ;
 375
 376 exp:
 377   NUM                { \$\$ = \$1;             }
 378 | exp '=' exp
 379   {
 380     if (\$1 != \$3)
 381       fprintf (stderr, "calc: error: %d != %d\\n", \$1, \$3);
 382     \$\$ = \$1;
 383   }
 384 | exp '+' exp        { \$\$ = \$1 + \$3;        }
 385 | exp '-' exp        { \$\$ = \$1 - \$3;        }
 386 | exp '*' exp        { \$\$ = \$1 * \$3;        }
 387 | exp '/' exp        { \$\$ = \$1 / \$3;        }
 388 | '-' exp  %prec NEG { \$\$ = -\$2;            }
 389 | exp '^' exp        { \$\$ = power (\$1, \$3); }
 390 | '(' exp ')'        { \$\$ = \$2;             }
 391 | '(' error ')'      { \$\$ = 1111;           }
 392 | '!'                { \$\$ = 0; YYERROR;     }
 393 | '-' error          { \$\$ = 0; YYERROR;     }
 394 ;
 395 %%
 396 /* The input.  */
 397 static FILE *input;
 398
 399 static void
 400 yyerror (const char *s)
 401 {
 402   fprintf (stderr, "%s\\n", s);
 403 }
 404
 405 static int
 406 get_char (void)
 407 {
 408   return getc (input);
 409 }
 410
 411
 412 static void
 413 unget_char ( int c)
 414 {
 415   ungetc (c, input);
 416 }
 417
 418 static int
 419 read_signed_integer (void)
 420 {
 421   int c = get_char ();
 422   int sign = 1;
 423   int n = 0;
 424
 425   if (c == '-')
 426     {
 427       c = get_char ();
 428       sign = -1;
 429     }
 430
 431   while (isdigit (c))
 432     {
 433       n = 10 * n + (c - '0');
 434       c = get_char ();
 435     }
 436
 437   unget_char (c);
 438
 439   return sign * n;
 440 }
 441
 442 static int
 443 #if YYPURE
 444 # define yylval (*yylvalp)
 445 yylex (YYSTYPE* yylvalp)
 446 #else
 447 yylex (void)
 448 #endif
 449 {
 450   int c;
 451
 452   /* Skip white space.  */
 453   while ((c = get_char ()) == ' ' || c == '\t')
 454     continue;
 455
 456   /* process numbers   */
 457   if (c == '.' || isdigit (c))
 458     {
 459       unget_char ( c);
 460       yylval.ival = read_signed_integer ();
 461       return NUM;
 462     }
 463
 464   /* Return end-of-file.  */
 465   if (c == EOF)
 466     return CALC_EOF;
 467
 468   /* Return single chars. */
 469   return c;
 470 }
 471
 472 static int
 473 power (int base, int exponent)
 474 {
 475   int res = 1;
 476   if (exponent < 0)
 477     exit (3);
 478   for (/* Niente */; exponent; --exponent)
 479     res *= base;
 480   return res;
 481 }
 482
 483
 484 int
 485 main (int argc, const char **argv)
 486 {
 487   semantic_value result = 0;
 488   int count = 0;
 489   int status;
 490
 491   input = fopen ("calc.input", "r");
 492   if (!input)
 493     {
 494       perror ("calc.input");
 495       return 3;
 496     }
 497
 498   status = yyparse ();
 499   if (global_result != result)
 500     abort ();
 501   if (global_count != count)
 502     abort ();
 503
 504   return status;
 505 }
 506 EOF
 507 }
 508
 509 ##################################################################
 510
 511 =item C<generate_grammar_variant ($base, $max, @directive)>
 512
 513 Generate a Bison file F<$base.y> that uses, or not, the Boost.Variants
 514 depending on the C<@directive>.
 515
 516 =cut
 517
 518 sub generate_grammar_variant ($$@)
 519 {
 520   my ($base, $max, @directive) = @_;
 521   my $directives = directives ($base, @directive);
 522   my $variant = grep { $_ eq '%define variant' } @directive;
 523
 524   my $out = new IO::File ">$base.y"
 525     or die;
 526   print $out <<EOF;
 527 %language "C++"
 528 %defines
 529 $directives
 530
 531 %code requires // variant.h
 532 {
 533 #include <string>
 534 }
 535
 536 %code // variant.c
 537 {
 538 #include <algorithm>
 539 #include <iostream>
 540 #include <sstream>
 541
 542 // Prototype of the yylex function providing subsequent tokens.
 543 static yy::parser::token_type yylex(yy::parser::semantic_type* yylval);
 544
 545 #define STAGE_MAX    ($max * 10) // max = $max
 546 #define USE_VARIANTS $variant
 547 #if USE_VARIANTS
 548 # define IF_VARIANTS(True, False) True
 549 #else
 550 # define IF_VARIANTS(True, False) False
 551 #endif
 552 }
 553 EOF
 554
 555   if ($variant)
 556     {
 557       print $out <<'EOF';
 558 %token <std::string> TEXT
 559 %token <int> NUMBER
 560 %printer { std::cerr << "Number: " << $$; } <int>
 561 %printer { std::cerr << "Text: " << $$; } <std::string>
 562 %token END_OF_FILE 0
 563 %type <std::string> text result
 564
 565 %%
 566 result:
 567   text                  { /* Throw away the result. */ }
 568 ;
 569
 570 text:
 571   /* nothing */         { /* This will generate an empty string */ }
 572 | text TEXT             { std::swap($$,$1); $$.append($2); }
 573 | text NUMBER           {
 574                           std::swap($$,$1);
 575                           std::ostringstream ss;
 576                           ss << ' ' << $2;
 577                           $$.append(ss.str());
 578                          }
 579 ;
 580 EOF
 581     }
 582   else
 583     {
 584       # Not using Bison variants.
 585       print $out <<'EOF';
 586 %union {int ival; std::string* sval;}
 587 %token <sval> TEXT
 588 %token <ival> NUMBER
 589 %printer { std::cerr << "Number: " << $$; } <ival>
 590 %printer { std::cerr << "Text: " << *$$; } <sval>
 591 %token END_OF_FILE 0
 592 %type <sval> text result
 593
 594 %%
 595 result:
 596   text                  { delete $1; }
 597 ;
 598
 599 text:
 600   /* nothing */         { $$ = new std::string; }
 601 | text TEXT             { $$->append(*$2); delete $2; }
 602 | text NUMBER           {
 603                           std::ostringstream ss;
 604                           ss << ' ' << $2;
 605                           $$->append(ss.str());
 606                          }
 607 ;
 608 EOF
 609     }
 610
 611   print $out <<'EOF';
 612 %%
 613 static
 614 yy::parser::token_type
 615 yylex(yy::parser::semantic_type* yylval)
 616 {
 617   static int stage = -1;
 618   ++stage;
 619   if (stage == STAGE_MAX)
 620     return yy::parser::token::END_OF_FILE;
 621   else if (stage % 2)
 622     {
 623       IF_VARIANTS(yylval->build<int>(), yylval->ival) = stage;
 624       return yy::parser::token::NUMBER;
 625     }
 626   else
 627     {
 628       IF_VARIANTS(yylval->build<std::string>() =, yylval->sval = new) std::string("A string.");
 629       return yy::parser::token::TEXT;
 630     }
 631   abort();
 632 }
 633
 634 // Mandatory error function
 635 void
 636 yy::parser::error(const yy::parser::location_type& yylloc,
 637                   const std::string& message)
 638 {
 639   std::cerr << yylloc << ": " << message << std::endl;
 640 }
 641
 642 int main(int argc, char *argv[])
 643 {
 644   yy::parser p;
 645 #if YYDEBUG
 646   p.set_debug_level(!!getenv("YYDEBUG"));
 647 #endif
 648   p.parse();
 649   return 0;
 650 }
 651 EOF
 652 }
 653
 654 ##################################################################
 655
 656 =item C<generate_grammar ($name, $base, @directive)>
 657
 658 Generate F<$base.y> by calling C<&generate_grammar_$name>.
 659
 660 =cut
 661
 662 sub generate_grammar ($$@)
 663 {
 664   my ($name, $base, @directive) = @_;
 665   verbose 2, "Generating $base.y\n";
 666   my %generator =
 667     (
 668       "calc"       => \&generate_grammar_calc,
 669       "triangular" => \&generate_grammar_triangular,
 670       "variant"    => \&generate_grammar_variant,
 671     );
 672   &{$generator{$name}}($base, 200, @directive);
 673 }
 674
 675 ##################################################################
 676
 677 =item C<run ($command)>
 678
 679 Run, possibly verbosely, the shell C<$command>.
 680
 681 =cut
 682
 683 sub run ($)
 684 {
 685   my ($command) = @_;
 686   verbose 2, "$command\n";
 687   system ("$command") == 0
 688     or die "$command failed";
 689 }
 690
 691 ##################################################################
 692
 693 =item C<compile ($base)>
 694
 695 Compile C<$base.y> to an executable C, Using the C or C++ compiler
 696 depending on the %language specification in C<$base.y>.
 697
 698 =cut
 699
 700 sub compile ($)
 701 {
 702   my ($base) = @_;
 703   my $language = `sed -ne '/%language "\\(.*\\)"/{s//\\1/;p;q;}' $base.y`;
 704   chomp $language;
 705
 706   my $compiler = $language eq 'C++' ? $cxx : $cc;
 707
 708   run "$bison $base.y -o $base.c";
 709   run "$compiler -o $base $cflags $base.c";
 710 }
 711
 712 ######################################################################
 713
 714 =item C<bench_grammar ($gram, %bench)>
 715
 716 Generate benches for C<$gram>.  C<$gram> should be C<calc> or
 717 C<triangle>.  C<%bench> is a hash of the form:
 718
 719   $name => @directive
 720
 721 where C<$name> is the name of the bench, and C<@directive> are the
 722 Bison directive to use for this bench.  All the benches are compared
 723 against each other, repeated 50 times.
 724
 725 =cut
 726
 727 sub bench_grammar ($%)
 728 {
 729   my ($gram, %test) = @_;
 730
 731   use Benchmark qw (:all :hireswallclock);
 732
 733   # Set up the benches as expected by timethese.
 734   my %bench;
 735   # For each bench, capture the size.
 736   my %size;
 737   while (my ($name, $directives) = each %test)
 738     {
 739       generate_grammar ($gram, $name, @$directives);
 740       # Compile the executable.
 741       compile ($name);
 742       $bench{$name} = "system ('./$name');";
 743       chop($size{$name} = `wc -c <$name`);
 744     }
 745
 746   # Run the benches.
 747   #
 748   # STYLE can be any of 'all', 'none', 'noc', 'nop' or 'auto'.  'all'
 749   # shows each of the 5 times available ('wallclock' time, user time,
 750   # system time, user time of children, and system time of
 751   # children). 'noc' shows all except the two children times. 'nop'
 752   # shows only wallclock and the two children times.  'auto' (the
 753   # default) will act as 'all' unless the children times are both
 754   # zero, in which case it acts as 'noc'.  'none' prevents output.
 755   verbose 2, "Running the benches for $gram\n";
 756   my $res = timethese ($iterations, \%bench, 'nop');
 757
 758   # Output the speed result.
 759   cmpthese ($res, 'nop');
 760
 761   # Display the sizes.
 762   print "Sizes (decreasing):\n";
 763   my $width = 10;
 764   for my $bench (keys %size)
 765     {
 766       $width = length $bench
 767         if $width < length $bench;
 768     }
 769   # Benches sorted by decreasing size.
 770   my @benches_per_size = sort {$size{$b} <=> $size{$a}} keys %size;
 771   for my $bench (@benches_per_size)
 772     {
 773       printf "%${width}s: %5.2fkB\n", $bench, $size{$bench} / 1024;
 774     }
 775 }
 776
 777 ######################################################################
 778
 779 =item C<bench_push_parser ()>
 780
 781 Bench the C push parser against the pull parser, pure and impure
 782 interfaces.
 783
 784 =cut
 785
 786 sub bench_push_parser ()
 787 {
 788   calc_input ('calc', 200);
 789   bench_grammar
 790     ('calc',
 791      (
 792       "pull-impure" => [],
 793       "pull-pure"   => ['%define api.pure'],
 794       "push-impure" => ['%define api.push_pull "both"'],
 795       "push-pure"   => ['%define api.push_pull "both"', '%define api.pure'],
 796      )
 797     );
 798 }
 799
 800 ######################################################################
 801
 802 =item C<bench_variant_parser ()>
 803
 804 Bench the C++ lalr1.cc parser using Boost.Variants or %union.
 805
 806 =cut
 807
 808 sub bench_variant_parser ()
 809 {
 810   bench_grammar
 811     ('variant',
 812      (
 813       "f-union"         => ['%skeleton "lalr1.cc"'],
 814       "f-uni-deb"   => ['%skeleton "lalr1.cc"', '%debug'],
 815       "f-var"       => ['%skeleton "lalr1.cc"', '%define variant'],
 816       "f-var-deb" => ['%skeleton "lalr1.cc"', '%debug', '%define variant'],
 817       "f-var-dtr"       => ['%skeleton "lalr1.cc"', '%define variant', "%code {\n#define VARIANT_DESTROY\n}"],
 818       "f-var-deb-dtr" => ['%skeleton "lalr1.cc"', '%debug', '%define variant', "%code {\n#define VARIANT_DESTROY\n}"],
 819       "f-var-deb-dtr-ass" => ['%skeleton "lalr1.cc"', '%debug', '%define variant', "%code {\n#define VARIANT_DESTROY\n}", "%define assert"],
 820      )
 821     );
 822 }
 823
 824 ######################################################################
 825
 826 =item C<bench_fusion_parser ()>
 827
 828 Bench the C++ lalr1.cc parser using Boost.Variants or %union.
 829
 830 =cut
 831
 832 sub bench_fusion_parser ()
 833 {
 834   bench_grammar
 835     ('variant',
 836      (
 837       "split"         => ['%skeleton "lalr1-split.cc"'],
 838       "fused"         => ['%skeleton "lalr1.cc"'],
 839      )
 840     );
 841 }
 842
 843 ############################################################################
 844
 845 sub help ($)
 846 {
 847   my ($verbose) = @_;
 848   use Pod::Usage;
 849   # See <URL:http://perldoc.perl.org/pod2man.html#NOTES>.
 850   pod2usage( { -message => "Bench Bison parsers",
 851                -exitval => 0,
 852                -verbose => $verbose,
 853                -output  => \*STDOUT });
 854 }
 855
 856 ######################################################################
 857
 858 sub getopt ()
 859 {
 860   use Getopt::Long;
 861   my %option = (
 862     "c|cflags=s"     => \$cflags,
 863     "h|help"         => sub { help ($verbose) },
 864     "i|iterations=i" => \$iterations,
 865     "q|quiet"        => sub { --$verbose },
 866     "v|verbose"      => sub { ++$verbose },
 867     );
 868   Getopt::Long::Configure ("bundling", "pass_through");
 869   GetOptions (%option)
 870     or exit 1;
 871 }
 872
 873 ######################################################################
 874
 875 getopt;
 876 verbose 1, "Using bison=$bison.\n";
 877 verbose 1, "Using cc=$cc.\n";
 878 verbose 1, "Using cxx=$cxx.\n";
 879 verbose 1, "Using cflags=$cflags.\n";
 880
 881 for my $b (@ARGV)
 882 {
 883   verbose 1, "Running benchmark $b.\n";
 884   bench_fusion_parser()  if $b eq "fusion";
 885   bench_push_parser()    if $b eq "push";
 886   bench_variant_parser() if $b eq "variant";
 887 }
 888
 889 ### Setup "GNU" style for perl-mode and cperl-mode.
 890 ## Local Variables:
 891 ## perl-indent-level: 2
 892 ## perl-continued-statement-offset: 2
 893 ## perl-continued-brace-offset: 0
 894 ## perl-brace-offset: 0
 895 ## perl-brace-imaginary-offset: 0
 896 ## perl-label-offset: -2
 897 ## cperl-indent-level: 2
 898 ## cperl-brace-offset: 0
 899 ## cperl-continued-brace-offset: 0
 900 ## cperl-label-offset: -2
 901 ## cperl-extra-newline-before-brace: t
 902 ## cperl-merge-trailing-else: nil
 903 ## cperl-continued-statement-offset: 2
 904 ## End: