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bench.pl: a command line interface
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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
30=item B<-c>, B<--cflags>=I<flags>
31
32Flags to pass to the C or C++ compiler.
33
34=item B<-i>, B<--iterations>=I<integer>
35
36Say how many times a single test of the bench must be run.
37
38=item B<-v>, B<--verbose>
39
40Raise the verbosity level. Currently only affects B<--help>.
41
15129f25
AD		 42=cut
43
3cedc2dc
AD		 44use IO::File;
45use Benchmark qw (:all);
46
2e7944cb 47my $bison = $ENV{'BISON'} || '@abs_top_builddir@/tests/bison';
3cedc2dc 48my $cc = $ENV{'CC'} || 'gcc';
7109a18d 49my $cxx = $ENV{'CXX'} || 'g++';
7e5f9c54
AD		 50# Compiler flags (C or C++).
51my $cflags = '';
52# The number of times the parser is run for a bench.
53my $iterations = 50;
3cedc2dc
AD		 54
55##################################################################
56
7e5f9c54
AD		 57=head1 DESCRIPTIONS
58
15129f25
AD		 59=head2 Functions
60
61=over 4
62
922730fe
AD		 63=item C<directives($bench, @directive)>
64
65Format the list of directives for Bison for bench named C<$bench>.
66
7109a18d
AD		 67The special fake C<%variant> directive requests the use of
68Boost.Variants instead of a regular union. So don't pass it, it is
69not a valid directive.
70
922730fe
AD		 71=cut
72
73sub directives($@)
74{
75 my ($bench, @directives) = @_;
76 my $res = "/* Directives for bench `$bench'. */\n";
7109a18d
AD		 77 for my $d (@directives)
78 {
79 $res .= $d . "\n"
80 unless $d eq '%variant';
81 }
922730fe
AD		 82 $res .= "/* End of directives for bench `$bench'. */\n";
83 return $res;
84}
85
86=item C<triangular_grammar ($base, $max, @directives)>
15129f25
AD		 87
88Create 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
7e5f9c54 104C<$base> is the base name for the file to create (F<$base.y>).
15129f25 105C<$max> is the number of such rules (here, 5). You may pass
922730fe 106additional Bison C<@directives>.
15129f25
AD		 107
108The created parser is self contained: it includes its scanner, and
109source of input.
110=cut
111
3cedc2dc
AD		 112sub triangular_grammar ($$$)
113{
922730fe
AD		 114 my ($base, $max, @directives) = @_;
115 my $directives = directives ($base, @directives);
3cedc2dc
AD		 116
117 my $out = new IO::File ">$base.y"
118 or die;
119 print $out <<EOF;
120%error-verbose
121%debug
122%{
123#include <stdio.h>
124#include <stdlib.h>
125
126static int yylex (void);
127static void yyerror (const char *msg);
128%}
922730fe 129$directives
3cedc2dc
AD		 130%union
131{
132 int val;
133};
134
135%token END "end"
136%type <val> exp input
137EOF
138
139 for my $size (1 .. $max)
140 {
141 print $out "%token t$size $size \"$size\"\n";
142 };
143
144print $out <<EOF;
145%%
146input:
147 exp { if (\$1 != 0) abort (); \$\$ = \$1; }
148| input exp { if (\$2 != \$1 + 1) abort (); \$\$ = \$2; }
149;
150
151exp:
152 END
153 { \$\$ = 0; }
154EOF
155
156for my $size (1 .. $max)
157 {
158 use Text::Wrap;
159 print $out wrap ("| ", " ",
160 (map { "\"$_\"" } (1 .. $size)),
161 " END \n"),
162 " { \$\$ = $size; }\n";
163 };
164print $out ";\n";
165
166print $out <<EOF;
167%%
168static int
169yylex (void)
170{
171 static int inner = 1;
172 static int outer = 0;
173 if (outer > $max)
174 return 0;
175 else if (inner > outer)
176 {
177 inner = 1;
178 ++outer;
179 return END;
180 }
181 return inner++;
182}
183
184static void
185yyerror (const char *msg)
186{
187 fprintf (stderr, "%s\\n", msg);
188}
189
190int
191main (void)
192{
193 yydebug = !!getenv ("YYDEBUG");
194 return yyparse ();
195}
196EOF
197}
198
199##################################################################
200
15129f25
AD		 201=item C<calc_input ($base, $max)>
202
7e5f9c54 203Generate the input file F<$base.input> for the calc parser. The input
15129f25
AD		 204is composed of two expressions. The first one is using left recursion
205only and consumes no stack. The second one requires a deep stack.
206These two expressions are repeated C<$max> times in the output file.
207
208=cut
209
3cedc2dc
AD		 210sub calc_input ($$)
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##################################################################
922730fe 223=item C<calc_grammar ($base, $max, @directives)>
15129f25 224
7e5f9c54 225Generate a Bison file F<$base.y> for a calculator parser in C. Pass
7109a18d
AD		 226the additional Bison C<@directives>. C<$max> is ignored, but left to
227have the same interface as C<triangular_grammar>.
15129f25
AD		 228
229=cut
3cedc2dc
AD		 230
231sub calc_grammar ($$$)
232{
922730fe
AD		 233 my ($base, $max, @directives) = @_;
234 my $directives = directives ($base, @directives);
3cedc2dc
AD		 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. */
248typedef int semantic_value;
249
250static semantic_value global_result = 0;
251static int global_count = 0;
252%}
253
3cedc2dc
AD		 254$directives
255%error-verbose
922730fe 256/* Exercise %union. */
3cedc2dc
AD		 257%union
258{
259 semantic_value ival;
260};
261
262%{
263static int power (int base, int exponent);
264/* yyerror receives the location if:
265 - %location & %pure & %glr
266 - %location & %pure & %yacc & %parse-param. */
267static void yyerror (const char *s);
268#if YYPURE
269static int yylex (YYSTYPE* yylvalp);
270#else
271static 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%%
288input:
289 line
290| input line
291;
292
293line:
294 '\\n'
295| exp '\\n' { USE (\$1); }
296;
297
298exp:
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. */
319static FILE *input;
320
321static void
322yyerror (const char *s)
323{
324 fprintf (stderr, "%s\\n", s);
325}
326
327static int
328get_char (void)
329{
330 return getc (input);
331}
332
333
334static void
335unget_char ( int c)
336{
337 ungetc (c, input);
338}
339
340static int
341read_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
3cedc2dc
AD		 364static int
365#if YYPURE
366# define yylval (*yylvalp)
367yylex (YYSTYPE* yylvalp)
368#else
369yylex (void)
370#endif
371{
372 int c;
373
374 /* Skip white space. */
375 while ((c = get_char ()) == ' ' || c == '\t')
0925d5bf 376 continue;
3cedc2dc
AD		 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
394static int
395power (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
3cedc2dc
AD		 406int
407main (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}
428EOF
429}
430
431##################################################################
432
7109a18d
AD		 433=item C<variant_grammar ($base, $max, @directives)>
434
7e5f9c54 435Generate a Bison file F<$base.y> that uses, or not, the Boost.Variants
7109a18d
AD		 436depending on the C<@directives>.
437
438=cut
439
440sub 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 $out <<EOF;
449%debug
450%language "C++"
451%defines
452
453%code requires // code for the .hh file
454{
455#include <string>
456}
457
458%code // code for the .cc file
459{
460#include <algorithm>
461#include <iostream>
462#include <sstream>
463
464// Prototype of the yylex function providing subsequent tokens.
465static yy::parser::token_type yylex(yy::parser::semantic_type* yylval);
466
7e5f9c54 467#define STAGE_MAX ($max * 10)
7109a18d
AD		 468#define USE_VARIANTS $variant
469#if USE_VARIANTS
470# define IF_VARIANTS(True, False) True
471#else
472# define IF_VARIANTS(True, False) False
473#endif
474}
475EOF
476
477 if ($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%%
489result:
490 text { /* Throw away the result. */ }
491;
492
493text:
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;
503EOF
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%%
518result:
519 text { delete $1; }
520;
521
522text:
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;
531EOF
532 }
533
534 print $out <<'EOF';
535%%
536static
537yy::parser::token_type
538yylex(yy::parser::semantic_type* yylval)
539{
540 static int stage = -1;
541 ++stage;
542 if (stage == STAGE_MAX)
543 return yy::parser::token::END_OF_FILE;
544 else if (stage % 2)
545 {
546 IF_VARIANTS(*yylval, yylval->ival) = stage;
547 return yy::parser::token::NUMBER;
548 }
549 else
550 {
551 IF_VARIANTS(*yylval =, yylval->sval = new) std::string("A string.");
552 return yy::parser::token::TEXT;
553 }
554 abort();
555}
556
557// Mandatory error function
558void
559yy::parser::error(const yy::parser::location_type& yylloc,
560 const std::string& message)
561{
562 std::cerr << yylloc << ": " << message << std::endl;
563}
564
565int main(int argc, char *argv[])
566{
567 yy::parser p;
568 p.set_debug_level(!!getenv("YYDEBUG"));
569 p.parse();
570 return 0;
571}
572EOF
573}
574
575##################################################################
576
15129f25
AD		 577=item C<compile ($base)>
578
7109a18d
AD		 579Compile C<$base.y> to an executable C, Using the C or C++ compiler
580depending on the %language specification in C<$base.y>.
15129f25
AD		 581
582=cut
583
3cedc2dc
AD		 584sub compile ($)
585{
586 my ($base) = @_;
7109a18d
AD		 587 my $language = `sed -ne '/%language "\\(.*\\)"/{s//\\1/;p;q;}' $base.y`;
588 chomp $language;
589
590 my $compiler = $language eq 'C++' ? $cxx : $cc;
591
3cedc2dc
AD		 592 system ("$bison $base.y -o $base.c") == 0
593 or die;
7e5f9c54 594 system ("$compiler -o $base $cflags $base.c") == 0
3cedc2dc
AD		 595 or die;
596}
597
7484f1d4 598=item C<bench_grammar ($gram, %bench)>
15129f25
AD		 599
600Generate benches for C<$gram>. C<$gram> should be C<calc> or
7484f1d4
AD		 601C<triangle>. C<%bench> is a hash of the form:
602
7e5f9c54 603 $name => @directives
7484f1d4 604
922730fe 605where C<$name> is the name of the bench, and C<@directives> are the
7484f1d4
AD		 606Bison directive to use for this bench. All the benches are compared
607against each other, repeated 50 times.
15129f25
AD		 608
609=cut
610
7484f1d4 611sub bench_grammar ($%)
3cedc2dc 612{
7484f1d4 613 my ($gram, %test) = @_;
f16b0819 614
7484f1d4 615 # Set up the benches as expected by timethese.
3cedc2dc
AD		 616 my %bench;
617 while (my ($name, $directives) = each %test)
618 {
619 print STDERR "$name\n";
7484f1d4 620 # Call the Bison input file generator.
3cedc2dc 621 my $generator = "$gram" . "_grammar";
922730fe 622 &$generator ($name, 200, @$directives);
3cedc2dc
AD		 623 compile ($name);
624 $bench{$name} = "system ('./$name');";
625 }
626
627 print "$gram:\n";
7484f1d4 628 # Run the benches.
7e5f9c54 629 my $res = timethese ($iterations, \%bench, 'nop');
7484f1d4 630 # Output the result.
3cedc2dc
AD		 631 cmpthese ($res, 'nop');
632}
633
7484f1d4
AD		 634
635=item C<bench_push_parser ()>
636
637Bench the C push parser against the pull parser, pure and impure
638interfaces.
639
640=cut
641
642sub bench_push_parser ()
643{
7484f1d4
AD		 644 calc_input ('calc', 200);
645 bench_grammar
646 ('calc',
647 (
922730fe
AD		 648 "pull-impure" => [],
649 "pull-pure" => ['%define api.pure'],
650 "push-impure" => ['%define api.push_pull "both"'],
651 "push-pure" => ['%define api.push_pull "both"', '%define api.pure'],
7484f1d4
AD		 652 )
653 );
654}
655
7109a18d
AD		 656=item C<bench_variant_parser ()>
657
658Bench the C++ lalr1.cc parser using Boost.Variants or %union.
659
660=cut
661
662sub bench_variant_parser ()
663{
664 bench_grammar
665 ('variant',
666 (
667 "union" => [],
668 "variant" => ['%variant'],
669 )
670 );
671}
672
673############################################################################
674
7e5f9c54
AD		 675sub help ($)
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
686sub getopt ()
687{
688 use Getopt::Long;
689 my $verbose = 0;
690 %option = ("h|help" => sub { help ($verbose) },
691 "v|verbose" => sub { ++$verbose },
692 "c|cflags=s" => \$cflags,
693 "i|iterations=i" => \$iterations);
694 Getopt::Long::Configure ("bundling", "pass_through");
695 GetOptions (%option)
696 or exit 1;
697}
698
699######################################################################
700
701getopt;
702print STDERR "Using bison=$bison, cc=$cc, cxx=$cxx, cflags=$cflags.\n";
7109a18d
AD		 703# bench_push_parser();
704bench_variant_parser();
3cedc2dc
AD		 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:
bison