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3cedc2dc
AD		 1#! /usr/bin/perl -w
2
9ca7f077 3# Copyright (C) 2006, 2008 Free Software Foundation, Inc.
f16b0819 4#
3cedc2dc 5# This file is part of Bison, the GNU Compiler Compiler.
f16b0819
PE		 6#
7# This program is free software: you can redistribute it and/or modify
3cedc2dc 8# it under the terms of the GNU General Public License as published by
f16b0819
PE		 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,
3cedc2dc
AD		 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.
f16b0819 16#
3cedc2dc 17# You should have received a copy of the GNU General Public License
f16b0819
PE		 18# along with this program. If not, see <http://www.gnu.org/licenses/>.
19
15129f25
AD		 20=head1 NAME
21
22bench.pl - perform benches on Bison parsers.
23
24=head1 SYNOPSIS
25
26 ./bench.pl
27
7e5f9c54
AD		 28=head1 OPTIONS
29
e1b74b92
AD		 30=over 4
31
7e5f9c54
AD		 32=item B<-c>, B<--cflags>=I<flags>
33
34Flags to pass to the C or C++ compiler.
35
36=item B<-i>, B<--iterations>=I<integer>
37
d11ee647
AD		 38Say how many times a single test of the bench must be run. If
39negative, specify the minimum number of CPU seconds to run. Defaults
40to -3.
7e5f9c54
AD		 41
42=item B<-v>, B<--verbose>
43
44Raise the verbosity level. Currently only affects B<--help>.
45
e1b74b92
AD		 46=back
47
15129f25
AD		 48=cut
49
3cedc2dc 50use IO::File;
3cedc2dc 51
e1b74b92
AD		 52##################################################################
53
54=head1 VARIABLES
55
56=over 4
57
58=item C<$bison>
59
60The Bison program to use to compile the grammar.
61
62=item C<$cc>
63
64The C compiler.
65
66=item C<$cxx>
67
68The C++ compiler.
69
70=item C<$cflags>
71
72Compiler flags (C or C++).
73
74=item C<$iterations>
75
76The number of times the parser is run for a bench.
77
78=item C<$verbose>
79
80Verbosity level.
81
82=back
83
84=cut
85
2e7944cb 86my $bison = $ENV{'BISON'} || '@abs_top_builddir@/tests/bison';
3cedc2dc 87my $cc = $ENV{'CC'} || 'gcc';
7109a18d 88my $cxx = $ENV{'CXX'} || 'g++';
7e5f9c54 89my $cflags = '';
d11ee647 90my $iterations = -3;
e1b74b92 91my $verbose = 0;
3cedc2dc 92
e1b74b92 93=head1 FUNCTIONS
3cedc2dc 94
e1b74b92 95=over 4
7e5f9c54 96
e1b74b92 97=item C<verbose($level, $message)>
15129f25 98
e1b74b92
AD		 99Report the C<$message> is C<$level> E<lt>= C<$verbose>.
100
101=cut
102
103sub verbose($$)
104{
105 my ($level, $message) = @_;
106 print STDERR $message
107 if $level <= $verbose;
108}
15129f25 109
922730fe
AD		 110=item C<directives($bench, @directive)>
111
112Format the list of directives for Bison for bench named C<$bench>.
113
7109a18d
AD		 114The special fake C<%variant> directive requests the use of
115Boost.Variants instead of a regular union. So don't pass it, it is
116not a valid directive.
117
922730fe
AD		 118=cut
119
120sub directives($@)
121{
5b421a4e 122 my ($bench, @directive) = @_;
922730fe 123 my $res = "/* Directives for bench `$bench'. */\n";
5b421a4e 124 for my $d (@directive)
7109a18d
AD		 125 {
126 $res .= $d . "\n"
127 unless $d eq '%variant';
128 }
922730fe
AD		 129 $res .= "/* End of directives for bench `$bench'. */\n";
130 return $res;
131}
132
5b421a4e 133=item C<triangular_grammar ($base, $max, @directive)>
15129f25
AD		 134
135Create a large triangular grammar which looks like :
136
137 input:
138 exp { if ($1 != 0) abort (); $$ = $1; }
139 | input exp { if ($2 != $1 + 1) abort (); $$ = $2; }
140 ;
141
142 exp:
143 END { $$ = 0; }
144 | "1" END { $$ = 1; }
145 | "1" "2" END { $$ = 2; }
146 | "1" "2" "3" END { $$ = 3; }
147 | "1" "2" "3" "4" END { $$ = 4; }
148 | "1" "2" "3" "4" "5" END { $$ = 5; }
149 ;
150
7e5f9c54 151C<$base> is the base name for the file to create (F<$base.y>).
15129f25 152C<$max> is the number of such rules (here, 5). You may pass
5b421a4e 153additional Bison C<@directive>.
15129f25
AD		 154
155The created parser is self contained: it includes its scanner, and
156source of input.
157=cut
158
3cedc2dc
AD		 159sub triangular_grammar ($$$)
160{
5b421a4e
AD		 161 my ($base, $max, @directive) = @_;
162 my $directives = directives ($base, @directive);
3cedc2dc
AD		 163
164 my $out = new IO::File ">$base.y"
165 or die;
166 print $out <<EOF;
167%error-verbose
168%debug
169%{
170#include <stdio.h>
171#include <stdlib.h>
172
173static int yylex (void);
174static void yyerror (const char *msg);
175%}
922730fe 176$directives
3cedc2dc
AD		 177%union
178{
179 int val;
180};
181
182%token END "end"
183%type <val> exp input
184EOF
185
186 for my $size (1 .. $max)
187 {
188 print $out "%token t$size $size \"$size\"\n";
189 };
190
191print $out <<EOF;
192%%
193input:
194 exp { if (\$1 != 0) abort (); \$\$ = \$1; }
195| input exp { if (\$2 != \$1 + 1) abort (); \$\$ = \$2; }
196;
197
198exp:
199 END
200 { \$\$ = 0; }
201EOF
202
203for my $size (1 .. $max)
204 {
205 use Text::Wrap;
206 print $out wrap ("| ", " ",
207 (map { "\"$_\"" } (1 .. $size)),
208 " END \n"),
209 " { \$\$ = $size; }\n";
210 };
211print $out ";\n";
212
213print $out <<EOF;
214%%
215static int
216yylex (void)
217{
218 static int inner = 1;
219 static int outer = 0;
220 if (outer > $max)
221 return 0;
222 else if (inner > outer)
223 {
224 inner = 1;
225 ++outer;
226 return END;
227 }
228 return inner++;
229}
230
231static void
232yyerror (const char *msg)
233{
234 fprintf (stderr, "%s\\n", msg);
235}
236
237int
238main (void)
239{
240 yydebug = !!getenv ("YYDEBUG");
241 return yyparse ();
242}
243EOF
244}
245
246##################################################################
247
15129f25
AD		 248=item C<calc_input ($base, $max)>
249
7e5f9c54 250Generate the input file F<$base.input> for the calc parser. The input
15129f25
AD		 251is composed of two expressions. The first one is using left recursion
252only and consumes no stack. The second one requires a deep stack.
253These two expressions are repeated C<$max> times in the output file.
254
255=cut
256
3cedc2dc
AD		 257sub calc_input ($$)
258{
259 my ($base, $max) = @_;
260 my $out = new IO::File ">$base.input"
261 or die;
262 foreach (1 .. $max)
263 {
264 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";
265 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";
266 }
267}
268
269##################################################################
5b421a4e 270=item C<calc_grammar ($base, $max, @directive)>
15129f25 271
7e5f9c54 272Generate a Bison file F<$base.y> for a calculator parser in C. Pass
5b421a4e 273the additional Bison C<@directive>. C<$max> is ignored, but left to
7109a18d 274have the same interface as C<triangular_grammar>.
15129f25
AD		 275
276=cut
3cedc2dc
AD		 277
278sub calc_grammar ($$$)
279{
5b421a4e
AD		 280 my ($base, $max, @directive) = @_;
281 my $directives = directives ($base, @directive);
3cedc2dc
AD		 282
283 my $out = new IO::File ">$base.y"
284 or die;
285 print $out <<EOF;
286%{
287#include <stdio.h>
288
289#include <stdlib.h>
290#include <string.h>
291#include <ctype.h>
292#define USE(Var)
293
294/* Exercise pre-prologue dependency to %union. */
295typedef int semantic_value;
296
297static semantic_value global_result = 0;
298static int global_count = 0;
299%}
300
3cedc2dc
AD		 301$directives
302%error-verbose
922730fe 303/* Exercise %union. */
3cedc2dc
AD		 304%union
305{
306 semantic_value ival;
307};
308
309%{
310static int power (int base, int exponent);
311/* yyerror receives the location if:
312 - %location & %pure & %glr
313 - %location & %pure & %yacc & %parse-param. */
314static void yyerror (const char *s);
315#if YYPURE
316static int yylex (YYSTYPE* yylvalp);
317#else
318static int yylex (void);
319#endif
320%}
321
322/* Bison Declarations */
323%token CALC_EOF 0 "end of input"
324%token <ival> NUM "number"
325%type <ival> exp
326
327%nonassoc '=' /* comparison */
328%left '-' '+'
329%left '*' '/'
330%left NEG /* negation--unary minus */
331%right '^' /* exponentiation */
332
333/* Grammar follows */
334%%
335input:
336 line
337| input line
338;
339
340line:
341 '\\n'
342| exp '\\n' { USE (\$1); }
343;
344
345exp:
346 NUM { \$\$ = \$1; }
347| exp '=' exp
348 {
349 if (\$1 != \$3)
350 fprintf (stderr, "calc: error: %d != %d\\n", \$1, \$3);
351 \$\$ = \$1;
352 }
353| exp '+' exp { \$\$ = \$1 + \$3; }
354| exp '-' exp { \$\$ = \$1 - \$3; }
355| exp '*' exp { \$\$ = \$1 * \$3; }
356| exp '/' exp { \$\$ = \$1 / \$3; }
357| '-' exp %prec NEG { \$\$ = -\$2; }
358| exp '^' exp { \$\$ = power (\$1, \$3); }
359| '(' exp ')' { \$\$ = \$2; }
360| '(' error ')' { \$\$ = 1111; }
361| '!' { \$\$ = 0; YYERROR; }
362| '-' error { \$\$ = 0; YYERROR; }
363;
364%%
365/* The input. */
366static FILE *input;
367
368static void
369yyerror (const char *s)
370{
371 fprintf (stderr, "%s\\n", s);
372}
373
374static int
375get_char (void)
376{
377 return getc (input);
378}
379
380
381static void
382unget_char ( int c)
383{
384 ungetc (c, input);
385}
386
387static int
388read_signed_integer (void)
389{
390 int c = get_char ();
391 int sign = 1;
392 int n = 0;
393
394 if (c == '-')
395 {
396 c = get_char ();
397 sign = -1;
398 }
399
400 while (isdigit (c))
401 {
402 n = 10 * n + (c - '0');
403 c = get_char ();
404 }
405
406 unget_char (c);
407
408 return sign * n;
409}
410
3cedc2dc
AD		 411static int
412#if YYPURE
413# define yylval (*yylvalp)
414yylex (YYSTYPE* yylvalp)
415#else
416yylex (void)
417#endif
418{
419 int c;
420
421 /* Skip white space. */
422 while ((c = get_char ()) == ' ' || c == '\t')
0925d5bf 423 continue;
3cedc2dc
AD		 424
425 /* process numbers */
426 if (c == '.' || isdigit (c))
427 {
428 unget_char ( c);
429 yylval.ival = read_signed_integer ();
430 return NUM;
431 }
432
433 /* Return end-of-file. */
434 if (c == EOF)
435 return CALC_EOF;
436
437 /* Return single chars. */
438 return c;
439}
440
441static int
442power (int base, int exponent)
443{
444 int res = 1;
445 if (exponent < 0)
446 exit (3);
447 for (/* Niente */; exponent; --exponent)
448 res *= base;
449 return res;
450}
451
452
3cedc2dc
AD		 453int
454main (int argc, const char **argv)
455{
456 semantic_value result = 0;
457 int count = 0;
458 int status;
459
460 input = fopen ("calc.input", "r");
461 if (!input)
462 {
463 perror ("calc.input");
464 return 3;
465 }
466
467 status = yyparse ();
468 if (global_result != result)
469 abort ();
470 if (global_count != count)
471 abort ();
472
473 return status;
474}
475EOF
476}
477
478##################################################################
479
5b421a4e 480=item C<variant_grammar ($base, $max, @directive)>
7109a18d 481
7e5f9c54 482Generate a Bison file F<$base.y> that uses, or not, the Boost.Variants
5b421a4e 483depending on the C<@directive>.
7109a18d
AD		 484
485=cut
486
487sub variant_grammar ($$$)
488{
5b421a4e
AD		 489 my ($base, $max, @directive) = @_;
490 my $directives = directives ($base, @directive);
491 my $variant = grep { $_ eq '%variant' } @directive;
7109a18d
AD		 492
493 my $out = new IO::File ">$base.y"
494 or die;
495 print $out <<EOF;
7109a18d
AD		 496%language "C++"
497%defines
5b421a4e 498$directives
7109a18d 499
5b421a4e 500%code requires // variant.h
7109a18d
AD		 501{
502#include <string>
503}
504
5b421a4e 505%code // variant.c
7109a18d
AD		 506{
507#include <algorithm>
508#include <iostream>
509#include <sstream>
510
511// Prototype of the yylex function providing subsequent tokens.
512static yy::parser::token_type yylex(yy::parser::semantic_type* yylval);
513
7e5f9c54 514#define STAGE_MAX ($max * 10)
7109a18d
AD		 515#define USE_VARIANTS $variant
516#if USE_VARIANTS
517# define IF_VARIANTS(True, False) True
518#else
519# define IF_VARIANTS(True, False) False
520#endif
521}
522EOF
523
524 if ($variant)
525 {
526 print $out <<'EOF';
527%code variant {int,std::string}
528%token <std::string> TEXT
529%token <int> NUMBER
530%printer { std::cerr << "Number: " << $$; } <int>
531%printer { std::cerr << "Text: " << $$; } <std::string>
532%token END_OF_FILE 0
533%type <std::string> text result
534
535%%
536result:
537 text { /* Throw away the result. */ }
538;
539
540text:
541 /* nothing */ { /* This will generate an empty string */ }
542| text TEXT { std::swap($$,$1); $$.append($2); }
543| text NUMBER {
544 std::swap($$,$1);
545 std::ostringstream ss;
546 ss << ' ' << $2;
547 $$.append(ss.str());
548 }
549;
550EOF
551 }
552 else
553 {
554 # Not using Boost variants.
555 print $out <<'EOF';
556%union {int ival; std::string* sval;}
557%token <sval> TEXT
558%token <ival> NUMBER
559%printer { std::cerr << "Number: " << $$; } <ival>
560%printer { std::cerr << "Text: " << *$$; } <sval>
561%token END_OF_FILE 0
562%type <sval> text result
563
564%%
565result:
566 text { delete $1; }
567;
568
569text:
570 /* nothing */ { $$ = new std::string; }
571| text TEXT { $$->append(*$2); delete $2; }
572| text NUMBER {
573 std::ostringstream ss;
574 ss << ' ' << $2;
575 $$->append(ss.str());
576 }
577;
578EOF
579 }
580
581 print $out <<'EOF';
582%%
583static
584yy::parser::token_type
585yylex(yy::parser::semantic_type* yylval)
586{
587 static int stage = -1;
588 ++stage;
589 if (stage == STAGE_MAX)
590 return yy::parser::token::END_OF_FILE;
591 else if (stage % 2)
592 {
593 IF_VARIANTS(*yylval, yylval->ival) = stage;
594 return yy::parser::token::NUMBER;
595 }
596 else
597 {
598 IF_VARIANTS(*yylval =, yylval->sval = new) std::string("A string.");
599 return yy::parser::token::TEXT;
600 }
601 abort();
602}
603
604// Mandatory error function
605void
606yy::parser::error(const yy::parser::location_type& yylloc,
607 const std::string& message)
608{
609 std::cerr << yylloc << ": " << message << std::endl;
610}
611
612int main(int argc, char *argv[])
613{
614 yy::parser p;
5b421a4e 615#if YYDEBUG
7109a18d 616 p.set_debug_level(!!getenv("YYDEBUG"));
5b421a4e 617#endif
7109a18d
AD		 618 p.parse();
619 return 0;
620}
621EOF
622}
623
624##################################################################
625
15129f25
AD		 626=item C<compile ($base)>
627
7109a18d
AD		 628Compile C<$base.y> to an executable C, Using the C or C++ compiler
629depending on the %language specification in C<$base.y>.
15129f25
AD		 630
631=cut
632
3cedc2dc
AD		 633sub compile ($)
634{
635 my ($base) = @_;
7109a18d
AD		 636 my $language = `sed -ne '/%language "\\(.*\\)"/{s//\\1/;p;q;}' $base.y`;
637 chomp $language;
638
639 my $compiler = $language eq 'C++' ? $cxx : $cc;
640
3cedc2dc
AD		 641 system ("$bison $base.y -o $base.c") == 0
642 or die;
7e5f9c54 643 system ("$compiler -o $base $cflags $base.c") == 0
3cedc2dc
AD		 644 or die;
645}
646
7484f1d4 647=item C<bench_grammar ($gram, %bench)>
15129f25
AD		 648
649Generate benches for C<$gram>. C<$gram> should be C<calc> or
7484f1d4
AD		 650C<triangle>. C<%bench> is a hash of the form:
651
5b421a4e 652 $name => @directive
7484f1d4 653
5b421a4e 654where C<$name> is the name of the bench, and C<@directive> are the
7484f1d4
AD		 655Bison directive to use for this bench. All the benches are compared
656against each other, repeated 50 times.
15129f25
AD		 657
658=cut
659
7484f1d4 660sub bench_grammar ($%)
3cedc2dc 661{
7484f1d4 662 my ($gram, %test) = @_;
f16b0819 663
d11ee647
AD		 664 use Benchmark qw (:all :hireswallclock);
665
7484f1d4 666 # Set up the benches as expected by timethese.
3cedc2dc 667 my %bench;
d11ee647
AD		 668 # For each bench, capture the size.
669 my %size;
3cedc2dc
AD		 670 while (my ($name, $directives) = each %test)
671 {
e1b74b92 672 verbose 1, "Generating $name\n";
7484f1d4 673 # Call the Bison input file generator.
3cedc2dc 674 my $generator = "$gram" . "_grammar";
922730fe 675 &$generator ($name, 200, @$directives);
5b421a4e 676 # Compile the executable.
3cedc2dc
AD		 677 compile ($name);
678 $bench{$name} = "system ('./$name');";
d11ee647 679 chop($size{$name} = `wc -c <$name`);
3cedc2dc
AD		 680 }
681
7484f1d4 682 # Run the benches.
d11ee647
AD		 683 #
684 # STYLE can be any of 'all', 'none', 'noc', 'nop' or 'auto'. 'all'
685 # shows each of the 5 times available ('wallclock' time, user time,
686 # system time, user time of children, and system time of
687 # children). 'noc' shows all except the two children times. 'nop'
688 # shows only wallclock and the two children times. 'auto' (the
689 # default) will act as 'all' unless the children times are both
690 # zero, in which case it acts as 'noc'. 'none' prevents output.
691 verbose 1, "Running the benches for $gram\n";
7e5f9c54 692 my $res = timethese ($iterations, \%bench, 'nop');
d11ee647
AD		 693
694 # Output the speed result.
3cedc2dc 695 cmpthese ($res, 'nop');
d11ee647
AD		 696
697 # Display the sizes.
698 print "Sizes:\n";
0cc5bead 699 my $width = 10;
d11ee647
AD		 700 for my $bench (keys %size)
701 {
0cc5bead
AD		 702 $width = length $bench
703 if $width < length $bench;
704 }
705 for my $bench (keys %size)
706 {
707 printf "%${width}s: %5dkB\n", $bench, int ($size{$bench} / 1024);
d11ee647 708 }
3cedc2dc
AD		 709}
710
7484f1d4
AD		 711
712=item C<bench_push_parser ()>
713
714Bench the C push parser against the pull parser, pure and impure
715interfaces.
716
717=cut
718
719sub bench_push_parser ()
720{
7484f1d4
AD		 721 calc_input ('calc', 200);
722 bench_grammar
723 ('calc',
724 (
922730fe
AD		 725 "pull-impure" => [],
726 "pull-pure" => ['%define api.pure'],
727 "push-impure" => ['%define api.push_pull "both"'],
728 "push-pure" => ['%define api.push_pull "both"', '%define api.pure'],
7484f1d4
AD		 729 )
730 );
731}
732
7109a18d
AD		 733=item C<bench_variant_parser ()>
734
735Bench the C++ lalr1.cc parser using Boost.Variants or %union.
736
737=cut
738
739sub bench_variant_parser ()
740{
741 bench_grammar
742 ('variant',
743 (
5b421a4e
AD		 744 "union" => [],
745 "variant" => ['%variant'],
746 "union-debug" => ['%debug'],
747 "variant-debug" => ['%debug', '%variant'],
7109a18d
AD		 748 )
749 );
750}
751
429b4848
AD		 752=item C<bench_fusion_parser ()>
753
754Bench the C++ lalr1.cc parser using Boost.Variants or %union.
755
756=cut
757
758sub bench_fusion_parser ()
759{
760 bench_grammar
761 ('variant',
762 (
763 "split" => [],
764 "fused" => ['%skeleton "lalr1-fusion.cc"'],
765 )
766 );
767}
768
7109a18d
AD		 769############################################################################
770
7e5f9c54
AD		 771sub help ($)
772{
773 my ($verbose) = @_;
774 use Pod::Usage;
775 # See <URL:http://perldoc.perl.org/pod2man.html#NOTES>.
776 pod2usage( { -message => "Bench Bison parsers",
777 -exitval => 0,
778 -verbose => $verbose,
779 -output => \*STDOUT });
780}
781
782sub getopt ()
783{
784 use Getopt::Long;
7e5f9c54
AD		 785 %option = ("h|help" => sub { help ($verbose) },
786 "v|verbose" => sub { ++$verbose },
787 "c|cflags=s" => \$cflags,
788 "i|iterations=i" => \$iterations);
789 Getopt::Long::Configure ("bundling", "pass_through");
790 GetOptions (%option)
791 or exit 1;
792}
793
794######################################################################
795
796getopt;
e1b74b92
AD		 797verbose 1, "Using bison=$bison.\n";
798verbose 1, "Using cc=$cc.\n";
799verbose 1, "Using cxx=$cxx.\n";
800verbose 1, "Using cflags=$cflags.\n";
7109a18d 801# bench_push_parser();
429b4848
AD		 802# bench_variant_parser();
803bench_fusion_parser();
3cedc2dc
AD		 804
805### Setup "GNU" style for perl-mode and cperl-mode.
806## Local Variables:
807## perl-indent-level: 2
808## perl-continued-statement-offset: 2
809## perl-continued-brace-offset: 0
810## perl-brace-offset: 0
811## perl-brace-imaginary-offset: 0
812## perl-label-offset: -2
813## cperl-indent-level: 2
814## cperl-brace-offset: 0
815## cperl-continued-brace-offset: 0
816## cperl-label-offset: -2
817## cperl-extra-newline-before-brace: t
818## cperl-merge-trailing-else: nil
819## cperl-continued-statement-offset: 2
820## End:
bison