llvm.org GIT mirror llvm / release_27 docs / TestingGuide.html
release_27

Tree @release_27 (Download .tar.gz)

TestingGuide.html @release_27raw · history · blame

   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
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
                      "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
  <title>LLVM Testing Infrastructure Guide</title>
  <link rel="stylesheet" href="llvm.css" type="text/css">
</head>
<body>
      
<div class="doc_title">
  LLVM Testing Infrastructure Guide
</div>

<ol>
  <li><a href="#overview">Overview</a></li>
  <li><a href="#requirements">Requirements</a></li>
  <li><a href="#org">LLVM testing infrastructure organization</a>
    <ul>
      <li><a href="#dejagnu">DejaGNU tests</a></li>
      <li><a href="#testsuite">Test suite</a></li>
    </ul>
  </li>
  <li><a href="#quick">Quick start</a>
    <ul>
      <li><a href="#quickdejagnu">DejaGNU tests</a></li>
      <li><a href="#quicktestsuite">Test suite</a></li>
   </ul>
  </li>
  <li><a href="#dgstructure">DejaGNU structure</a>
    <ul>
      <li><a href="#dgcustom">Writing new DejaGNU tests</a></li>
      <li><a href="#FileCheck">The FileCheck utility</a></li>
      <li><a href="#dgvars">Variables and substitutions</a></li>
      <li><a href="#dgfeatures">Other features</a></li>
   </ul>
  </li>
  <li><a href="#testsuitestructure">Test suite structure</a></li>
  <li><a href="#testsuiterun">Running the test suite</a>
    <ul>
      <li><a href="#testsuiteexternal">Configuring External Tests</a></li>
      <li><a href="#testsuitetests">Running different tests</a></li>
      <li><a href="#testsuiteoutput">Generating test output</a></li>
      <li><a href="#testsuitecustom">Writing custom tests for llvm-test</a></li>
   </ul>
  </li>
  <li><a href="#nightly">Running the nightly tester</a></li>
</ol>

<div class="doc_author">
  <p>Written by John T. Criswell, <a
  href="http://llvm.x10sys.com/rspencer">Reid Spencer</a>, and Tanya Lattner</p>
</div>

<!--=========================================================================-->
<div class="doc_section"><a name="overview">Overview</a></div>
<!--=========================================================================-->

<div class="doc_text">

<p>This document is the reference manual for the LLVM testing infrastructure. It documents
the structure of the LLVM testing infrastructure, the tools needed to use it,
and how to add and run tests.</p>

</div>

<!--=========================================================================-->
<div class="doc_section"><a name="requirements">Requirements</a></div>
<!--=========================================================================-->

<div class="doc_text">

<p>In order to use the LLVM testing infrastructure, you will need all of the software
required to build LLVM, plus the following:</p>

<dl>
<dt><a href="http://www.gnu.org/software/dejagnu/">DejaGNU</a></dt>
<dd>The Feature and Regressions tests are organized and run by DejaGNU.</dd>
<dt><a href="http://expect.nist.gov/">Expect</a></dt>
<dd>Expect is required by DejaGNU.</dd>
<dt><a href="http://www.tcl.tk/software/tcltk/">tcl</a></dt>
<dd>Tcl is required by DejaGNU. </dd>
</dl>

</div>

<!--=========================================================================-->
<div class="doc_section"><a name="org">LLVM testing infrastructure organization</a></div>
<!--=========================================================================-->

<div class="doc_text">

<p>The LLVM testing infrastructure contains two major categories of tests: code
fragments and whole programs. Code fragments are referred to as the "DejaGNU
tests" and are in the <tt>llvm</tt> module in subversion under the
<tt>llvm/test</tt> directory. The whole programs tests are referred to as the
"Test suite" and are in the <tt>test-suite</tt> module in subversion.
</p>

</div>

<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="dejagnu">DejaGNU tests</a></div>
<!-- _______________________________________________________________________ -->

<div class="doc_text">

<p>Code fragments are small pieces of code that test a specific
feature of LLVM or trigger a specific bug in LLVM.  They are usually
written in LLVM assembly language, but can be written in other
languages if the test targets a particular language front end (and the
appropriate <tt>--with-llvmgcc</tt> options were used
at <tt>configure</tt> time of the <tt>llvm</tt> module). These tests
are driven by the DejaGNU testing framework, which is hidden behind a
few simple makefiles.</p>

<p>These code fragments are not complete programs. The code generated
from them is never executed to determine correct behavior.</p>

<p>These code fragment tests are located in the <tt>llvm/test</tt>
directory.</p>

<p>Typically when a bug is found in LLVM, a regression test containing 
just enough code to reproduce the problem should be written and placed 
somewhere underneath this directory.  In most cases, this will be a small 
piece of LLVM assembly language code, often distilled from an actual 
application or benchmark.</p>

</div>

<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="testsuite">Test suite</a></div>
<!-- _______________________________________________________________________ -->

<div class="doc_text">

<p>The test suite contains whole programs, which are pieces of
code which can be compiled and linked into a stand-alone program that can be
executed.  These programs are generally written in high level languages such as
C or C++, but sometimes they are written straight in LLVM assembly.</p>

<p>These programs are compiled and then executed using several different
methods (native compiler, LLVM C backend, LLVM JIT, LLVM native code generation,
etc).  The output of these programs is compared to ensure that LLVM is compiling
the program correctly.</p>

<p>In addition to compiling and executing programs, whole program tests serve as
a way of benchmarking LLVM performance, both in terms of the efficiency of the
programs generated as well as the speed with which LLVM compiles, optimizes, and
generates code.</p>

<p>The test-suite is located in the <tt>test-suite</tt> Subversion module.</p> 

</div>

<!--=========================================================================-->
<div class="doc_section"><a name="quick">Quick start</a></div>
<!--=========================================================================-->

<div class="doc_text">

  <p>The tests are located in two separate Subversion modules. The
  DejaGNU tests are in the main "llvm" module under the directory 
  <tt>llvm/test</tt> (so you get these tests for free with the main llvm tree).
  The more comprehensive test suite that includes whole 
programs in C and C++ is in the <tt>test-suite</tt> module. This module should
be checked out to the <tt>llvm/projects</tt> directory (don't use another name
then the default "test-suite", for then the test suite will be run every time
you run <tt>make</tt> in the main <tt>llvm</tt> directory).
When you <tt>configure</tt> the <tt>llvm</tt> module, 
the <tt>test-suite</tt> directory will be automatically configured. 
Alternatively, you can configure the <tt>test-suite</tt> module manually.</p>

<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="quickdejagnu">DejaGNU tests</a></div>
<!-- _______________________________________________________________________ -->
<p>To run all of the simple tests in LLVM using DejaGNU, use the master Makefile
 in the <tt>llvm/test</tt> directory:</p>

<div class="doc_code">
<pre>
% gmake -C llvm/test
</pre>
</div>

<p>or</p>

<div class="doc_code">
<pre>
% gmake check
</pre>
</div>

<p>To run only a subdirectory of tests in <tt>llvm/test</tt> using DejaGNU (ie.
Transforms), just set the TESTSUITE variable to the path of the
subdirectory (relative to <tt>llvm/test</tt>):</p>

<div class="doc_code">
<pre>
% gmake TESTSUITE=Transforms check
</pre>
</div>

<p><b>Note: If you are running the tests with <tt>objdir != subdir</tt>, you
must have run the complete testsuite before you can specify a
subdirectory.</b></p>

<p>To run only a single test, set <tt>TESTONE</tt> to its path (relative to
<tt>llvm/test</tt>) and make the <tt>check-one</tt> target:</p>

<div class="doc_code">
<pre>
% gmake TESTONE=Feature/basictest.ll check-one
</pre>
</div>

<p>To run the tests with Valgrind (Memcheck by default), just append
<tt>VG=1</tt> to the commands above, e.g.:</p>

<div class="doc_code">
<pre>
% gmake check VG=1
</pre>
</div>

<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="quicktestsuite">Test suite</a></div>
<!-- _______________________________________________________________________ -->

<p>To run the comprehensive test suite (tests that compile and execute whole 
programs), first checkout and setup the <tt>test-suite</tt> module:</p>

<div class="doc_code">
<pre>
% cd llvm/projects
% svn co http://llvm.org/svn/llvm-project/test-suite/trunk test-suite
% cd ..
% ./configure --with-llvmgccdir=$LLVM_GCC_DIR
</pre>
</div>

<p>where <tt>$LLVM_GCC_DIR</tt> is the directory where
you <em>installed</em> llvm-gcc, not it's src or obj
dir. The <tt>--with-llvmgccdir</tt> option assumes that
the <tt>llvm-gcc-4.2</tt> module was configured with
<tt>--program-prefix=llvm-</tt>, and therefore that the C and C++
compiler drivers are called <tt>llvm-gcc</tt> and <tt>llvm-g++</tt>
respectively.  If this is not the case,
use <tt>--with-llvmgcc</tt>/<tt>--with-llvmgxx</tt> to specify each
executable's location.</p>

<p>Then, run the entire test suite by running make in the <tt>test-suite</tt>
directory:</p>

<div class="doc_code">
<pre>
% cd projects/test-suite
% gmake
</pre>
</div>

<p>Usually, running the "nightly" set of tests is a good idea, and you can also
let it generate a report by running:</p>

<div class="doc_code">
<pre>
% cd projects/test-suite
% gmake TEST=nightly report report.html
</pre>
</div>

<p>Any of the above commands can also be run in a subdirectory of
<tt>projects/test-suite</tt> to run the specified test only on the programs in
that subdirectory.</p>

</div>

<!--=========================================================================-->
<div class="doc_section"><a name="dgstructure">DejaGNU structure</a></div>
<!--=========================================================================-->
<div class="doc_text">
  <p>The LLVM DejaGNU tests are driven by DejaGNU together with GNU Make and are
  located in the <tt>llvm/test</tt> directory.

  <p>This directory contains a large array of small tests
  that exercise various features of LLVM and to ensure that regressions do not
  occur. The directory is broken into several sub-directories, each focused on
  a particular area of LLVM. A few of the important ones are:</p>

  <ul>
    <li><tt>Analysis</tt>: checks Analysis passes.</li>
    <li><tt>Archive</tt>: checks the Archive library.</li>
    <li><tt>Assembler</tt>: checks Assembly reader/writer functionality.</li>
    <li><tt>Bitcode</tt>: checks Bitcode reader/writer functionality.</li>
    <li><tt>CodeGen</tt>: checks code generation and each target.</li>
    <li><tt>Features</tt>: checks various features of the LLVM language.</li>
    <li><tt>Linker</tt>: tests bitcode linking.</li>
    <li><tt>Transforms</tt>: tests each of the scalar, IPO, and utility
    transforms to ensure they make the right transformations.</li>
    <li><tt>Verifier</tt>: tests the IR verifier.</li>
  </ul>

</div>

<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="dgcustom">Writing new DejaGNU tests</a></div>
<!-- _______________________________________________________________________ -->
<div class="doc_text">
  <p>The DejaGNU structure is very simple, but does require some information to 
  be set. This information is gathered via <tt>configure</tt> and is written 
  to a file, <tt>site.exp</tt> in <tt>llvm/test</tt>. The <tt>llvm/test</tt> 
  Makefile does this work for you.</p>

  <p>In order for DejaGNU to work, each directory of tests must have a 
  <tt>dg.exp</tt> file. DejaGNU looks for this file to determine how to run the
  tests. This file is just a Tcl script and it can do anything you want, but 
  we've standardized it for the LLVM regression tests. If you're adding a
  directory of tests, just copy <tt>dg.exp</tt> from another directory to get
  running. The standard <tt>dg.exp</tt> simply loads a Tcl 
  library (<tt>test/lib/llvm.exp</tt>) and calls the <tt>llvm_runtests</tt> 
  function defined in that library with a list of file names to run. The names 
  are obtained by using Tcl's glob command.  Any directory that contains only
  directories does not need the <tt>dg.exp</tt> file.</p>

  <p>The <tt>llvm-runtests</tt> function lookas at each file that is passed to
  it and gathers any lines together that match "RUN:". This are the "RUN" lines
  that specify how the test is to be run. So, each test script must contain
  RUN lines if it is to do anything. If there are no RUN lines, the
  <tt>llvm-runtests</tt> function will issue an error and the test will
  fail.</p>

  <p>RUN lines are specified in the comments of the test program using the 
  keyword <tt>RUN</tt> followed by a colon, and lastly the command (pipeline) 
  to execute.  Together, these lines form the "script" that 
  <tt>llvm-runtests</tt> executes to run the test case.  The syntax of the
  RUN lines is similar to a shell's syntax for pipelines including I/O
  redirection and variable substitution.  However, even though these lines 
  may <i>look</i> like a shell script, they are not. RUN lines are interpreted 
  directly by the Tcl <tt>exec</tt> command. They are never executed by a 
  shell. Consequently the syntax differs from normal shell script syntax in a 
  few ways.  You can specify as many RUN lines as needed.</p>

  <p>Each RUN line is executed on its own, distinct from other lines unless
  its last character is <tt>\</tt>. This continuation character causes the RUN
  line to be concatenated with the next one. In this way you can build up long
  pipelines of commands without making huge line lengths. The lines ending in
  <tt>\</tt> are concatenated until a RUN line that doesn't end in <tt>\</tt> is
  found. This concatenated set of RUN lines then constitutes one execution. 
  Tcl will substitute variables and arrange for the pipeline to be executed. If
  any process in the pipeline fails, the entire line (and test case) fails too.
  </p>

  <p> Below is an example of legal RUN lines in a <tt>.ll</tt> file:</p>

<div class="doc_code">
<pre>
; RUN: llvm-as &lt; %s | llvm-dis &gt; %t1
; RUN: llvm-dis &lt; %s.bc-13 &gt; %t2
; RUN: diff %t1 %t2
</pre>
</div>

  <p>As with a Unix shell, the RUN: lines permit pipelines and I/O redirection
  to be used. However, the usage is slightly different than for Bash. To check
  what's legal, see the documentation for the 
  <a href="http://www.tcl.tk/man/tcl8.5/TclCmd/exec.htm#M2">Tcl exec</a>
  command and the 
  <a href="http://www.tcl.tk/man/tcl8.5/tutorial/Tcl26.html">tutorial</a>. 
  The major differences are:</p>
  <ul>
    <li>You can't do <tt>2&gt;&amp;1</tt>. That will cause Tcl to write to a
    file named <tt>&amp;1</tt>. Usually this is done to get stderr to go through
    a pipe. You can do that in tcl with <tt>|&amp;</tt> so replace this idiom:
    <tt>... 2&gt;&amp;1 | grep</tt> with <tt>... |&amp; grep</tt></li>
    <li>You can only redirect to a file, not to another descriptor and not from
    a here document.</li>
    <li>tcl supports redirecting to open files with the @ syntax but you
    shouldn't use that here.</li>
  </ul>

  <p>There are some quoting rules that you must pay attention to when writing
  your RUN lines. In general nothing needs to be quoted. Tcl won't strip off any
  ' or " so they will get passed to the invoked program. For example:</p>

<div class="doc_code">
<pre>
... | grep 'find this string'
</pre>
</div>

  <p>This will fail because the ' characters are passed to grep. This would
  instruction grep to look for <tt>'find</tt> in the files <tt>this</tt> and
  <tt>string'</tt>. To avoid this use curly braces to tell Tcl that it should
  treat everything enclosed as one value. So our example would become:</p>

<div class="doc_code">
<pre>
... | grep {find this string}
</pre>
</div>

  <p>Additionally, the characters <tt>[</tt> and <tt>]</tt> are treated 
  specially by Tcl. They tell Tcl to interpret the content as a command to
  execute. Since these characters are often used in regular expressions this can
  have disastrous results and cause the entire test run in a directory to fail.
  For example, a common idiom is to look for some basicblock number:</p>

<div class="doc_code">
<pre>
... | grep bb[2-8]
</pre>
</div>

  <p>This, however, will cause Tcl to fail because its going to try to execute
  a program named "2-8". Instead, what you want is this:</p>

<div class="doc_code">
<pre>
... | grep {bb\[2-8\]}
</pre>
</div>

  <p>Finally, if you need to pass the <tt>\</tt> character down to a program,
  then it must be doubled. This is another Tcl special character. So, suppose
  you had:

<div class="doc_code">
<pre>
... | grep 'i32\*'
</pre>
</div>

  <p>This will fail to match what you want (a pointer to i32). First, the
  <tt>'</tt> do not get stripped off. Second, the <tt>\</tt> gets stripped off
  by Tcl so what grep sees is: <tt>'i32*'</tt>. That's not likely to match
  anything. To resolve this you must use <tt>\\</tt> and the <tt>{}</tt>, like
  this:</p>

<div class="doc_code">
<pre>
... | grep {i32\\*}
</pre>
</div>

<p>If your system includes GNU <tt>grep</tt>, make sure
that <tt>GREP_OPTIONS</tt> is not set in your environment. Otherwise,
you may get invalid results (both false positives and false
negatives).</p>

</div>

<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="FileCheck">The FileCheck utility</a></div>
<!-- _______________________________________________________________________ -->

<div class="doc_text">

<p>A powerful feature of the RUN: lines is that it allows any arbitrary commands
   to be executed as part of the test harness.  While standard (portable) unix
   tools like 'grep' work fine on run lines, as you see above, there are a lot
   of caveats due to interaction with Tcl syntax, and we want to make sure the
   run lines are portable to a wide range of systems.  Another major problem is
   that grep is not very good at checking to verify that the output of a tools
   contains a series of different output in a specific order.  The FileCheck
   tool was designed to help with these problems.</p>

<p>FileCheck (whose basic command line arguments are described in <a
   href="http://llvm.org/cmds/FileCheck.html">the FileCheck man page</a> is
   designed to read a file to check from standard input, and the set of things
   to verify from a file specified as a command line argument.  A simple example
   of using FileCheck from a RUN line looks like this:</p>
   
<div class="doc_code">
<pre>
; RUN: llvm-as &lt; %s | llc -march=x86-64 | <b>FileCheck %s</b>
</pre>
</div>

<p>This syntax says to pipe the current file ("%s") into llvm-as, pipe that into
llc, then pipe the output of llc into FileCheck.  This means that FileCheck will
be verifying its standard input (the llc output) against the filename argument
specified (the original .ll file specified by "%s").  To see how this works,
lets look at the rest of the .ll file (after the RUN line):</p>

<div class="doc_code">
<pre>
define void @sub1(i32* %p, i32 %v) {
entry:
; <b>CHECK: sub1:</b>
; <b>CHECK: subl</b>
        %0 = tail call i32 @llvm.atomic.load.sub.i32.p0i32(i32* %p, i32 %v)
        ret void
}

define void @inc4(i64* %p) {
entry:
; <b>CHECK: inc4:</b>
; <b>CHECK: incq</b>
        %0 = tail call i64 @llvm.atomic.load.add.i64.p0i64(i64* %p, i64 1)
        ret void
}
</pre>
</div>

<p>Here you can see some "CHECK:" lines specified in comments.  Now you can see
how the file is piped into llvm-as, then llc, and the machine code output is
what we are verifying.  FileCheck checks the machine code output to verify that
it matches what the "CHECK:" lines specify.</p>

<p>The syntax of the CHECK: lines is very simple: they are fixed strings that
must occur in order.  FileCheck defaults to ignoring horizontal whitespace
differences (e.g. a space is allowed to match a tab) but otherwise, the contents
of the CHECK: line is required to match some thing in the test file exactly.</p>

<p>One nice thing about FileCheck (compared to grep) is that it allows merging
test cases together into logical groups.  For example, because the test above
is checking for the "sub1:" and "inc4:" labels, it will not match unless there
is a "subl" in between those labels.  If it existed somewhere else in the file,
that would not count: "grep subl" matches if subl exists anywhere in the
file.</p>

</div>

<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection"><a 
name="FileCheck-check-prefix">The FileCheck -check-prefix option</a></div>

<div class="doc_text">

<p>The FileCheck -check-prefix option allows multiple test configurations to be
driven from one .ll file.  This is useful in many circumstances, for example,
testing different architectural variants with llc.  Here's a simple example:</p>

<div class="doc_code">
<pre>
; RUN: llvm-as &lt; %s | llc -mtriple=i686-apple-darwin9 -mattr=sse41 \
; RUN:              | <b>FileCheck %s -check-prefix=X32</b>
; RUN: llvm-as &lt; %s | llc -mtriple=x86_64-apple-darwin9 -mattr=sse41 \
; RUN:              | <b>FileCheck %s -check-prefix=X64</b>

define &lt;4 x i32&gt; @pinsrd_1(i32 %s, &lt;4 x i32&gt; %tmp) nounwind {
        %tmp1 = insertelement &lt;4 x i32&gt; %tmp, i32 %s, i32 1
        ret &lt;4 x i32&gt; %tmp1
; <b>X32:</b> pinsrd_1:
; <b>X32:</b>    pinsrd $1, 4(%esp), %xmm0

; <b>X64:</b> pinsrd_1:
; <b>X64:</b>    pinsrd $1, %edi, %xmm0
}
</pre>
</div>

<p>In this case, we're testing that we get the expected code generation with
both 32-bit and 64-bit code generation.</p>

</div>

<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection"><a 
name="FileCheck-CHECK-NEXT">The "CHECK-NEXT:" directive</a></div>

<div class="doc_text">

<p>Sometimes you want to match lines and would like to verify that matches
happen on exactly consequtive lines with no other lines in between them.  In
this case, you can use CHECK: and CHECK-NEXT: directives to specify this.  If
you specified a custom check prefix, just use "&lt;PREFIX&gt;-NEXT:".  For
example, something like this works as you'd expect:</p>

<div class="doc_code">
<pre>
define void @t2(&lt;2 x double&gt;* %r, &lt;2 x double&gt;* %A, double %B) {
	%tmp3 = load &lt;2 x double&gt;* %A, align 16
	%tmp7 = insertelement &lt;2 x double&gt; undef, double %B, i32 0
	%tmp9 = shufflevector &lt;2 x double&gt; %tmp3,
                              &lt;2 x double&gt; %tmp7,
                              &lt;2 x i32&gt; &lt; i32 0, i32 2 &gt;
	store &lt;2 x double&gt; %tmp9, &lt;2 x double&gt;* %r, align 16
	ret void
        
; <b>CHECK:</b> t2:
; <b>CHECK:</b> 	movl	8(%esp), %eax
; <b>CHECK-NEXT:</b> 	movapd	(%eax), %xmm0
; <b>CHECK-NEXT:</b> 	movhpd	12(%esp), %xmm0
; <b>CHECK-NEXT:</b> 	movl	4(%esp), %eax
; <b>CHECK-NEXT:</b> 	movapd	%xmm0, (%eax)
; <b>CHECK-NEXT:</b> 	ret
}
</pre>
</div>

<p>CHECK-NEXT: directives reject the input unless there is exactly one newline
between it an the previous directive.  A CHECK-NEXT cannot be the first
directive in a file.</p>

</div>

<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection"><a 
name="FileCheck-CHECK-NOT">The "CHECK-NOT:" directive</a></div>

<div class="doc_text">

<p>The CHECK-NOT: directive is used to verify that a string doesn't occur
between two matches (or the first match and the beginning of the file).  For
example, to verify that a load is removed by a transformation, a test like this
can be used:</p>

<div class="doc_code">
<pre>
define i8 @coerce_offset0(i32 %V, i32* %P) {
  store i32 %V, i32* %P
   
  %P2 = bitcast i32* %P to i8*
  %P3 = getelementptr i8* %P2, i32 2

  %A = load i8* %P3
  ret i8 %A
; <b>CHECK:</b> @coerce_offset0
; <b>CHECK-NOT:</b> load
; <b>CHECK:</b> ret i8
}
</pre>
</div>

</div>

<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection"><a 
name="FileCheck-Matching">FileCheck Pattern Matching Syntax</a></div>

<div class="doc_text">

<p>The CHECK: and CHECK-NOT: directives both take a pattern to match.  For most
uses of FileCheck, fixed string matching is perfectly sufficient.  For some
things, a more flexible form of matching is desired.  To support this, FileCheck
allows you to specify regular expressions in matching strings, surrounded by
double braces: <b>{{yourregex}}</b>.  Because we want to use fixed string
matching for a majority of what we do, FileCheck has been designed to support
mixing and matching fixed string matching with regular expressions.  This allows
you to write things like this:</p>

<div class="doc_code">
<pre>
; CHECK: movhpd	<b>{{[0-9]+}}</b>(%esp), <b>{{%xmm[0-7]}}</b>
</pre>
</div>

<p>In this case, any offset from the ESP register will be allowed, and any xmm
register will be allowed.</p>

<p>Because regular expressions are enclosed with double braces, they are
visually distinct, and you don't need to use escape characters within the double
braces like you would in C.  In the rare case that you want to match double
braces explicitly from the input, you can use something ugly like
<b>{{[{][{]}}</b> as your pattern.</p>

</div>

<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection"><a 
name="FileCheck-Variables">FileCheck Variables</a></div>

<div class="doc_text">

<p>It is often useful to match a pattern and then verify that it occurs again
later in the file.  For codegen tests, this can be useful to allow any register,
but verify that that register is used consistently later.  To do this, FileCheck
allows named variables to be defined and substituted into patterns.  Here is a
simple example:</p>

<div class="doc_code">
<pre>
; CHECK: test5:
; CHECK:    notw	<b>[[REGISTER:%[a-z]+]]</b>
; CHECK:    andw	{{.*}}<b>[[REGISTER]]</b>
</pre>
</div>

<p>The first check line matches a regex (<tt>%[a-z]+</tt>) and captures it into
the variables "REGISTER".  The second line verifies that whatever is in REGISTER
occurs later in the file after an "andw".  FileCheck variable references are
always contained in <tt>[[ ]]</tt> pairs, are named, and their names can be
formed with the regex "<tt>[a-zA-Z][a-zA-Z0-9]*</tt>".  If a colon follows the
name, then it is a definition of the variable, if not, it is a use.</p>

<p>FileCheck variables can be defined multiple times, and uses always get the
latest value.  Note that variables are all read at the start of a "CHECK" line
and are all defined at the end.  This means that if you have something like
"<tt>CHECK: [[XYZ:.*]]x[[XYZ]]</tt>" that the check line will read the previous
value of the XYZ variable and define a new one after the match is performed.  If
you need to do something like this you can probably take advantage of the fact
that FileCheck is not actually line-oriented when it matches, this allows you to
define two separate CHECK lines that match on the same line.
</p>

</div>

<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="dgvars">Variables and
substitutions</a></div>
<!-- _______________________________________________________________________ -->
<div class="doc_text">
  <p>With a RUN line there are a number of substitutions that are permitted. In
  general, any Tcl variable that is available in the <tt>substitute</tt> 
  function (in <tt>test/lib/llvm.exp</tt>) can be substituted into a RUN line.
  To make a substitution just write the variable's name preceded by a $. 
  Additionally, for compatibility reasons with previous versions of the test
  library, certain names can be accessed with an alternate syntax: a % prefix.
  These alternates are deprecated and may go away in a future version.
  </p>
  <p>Here are the available variable names. The alternate syntax is listed in
  parentheses.</p>

  <dl style="margin-left: 25px">
    <dt><b>$test</b> (%s)</dt>
    <dd>The full path to the test case's source. This is suitable for passing
    on the command line as the input to an llvm tool.</dd>

    <dt><b>$srcdir</b></dt>
    <dd>The source directory from where the "<tt>make check</tt>" was run.</dd>

    <dt><b>objdir</b></dt>
    <dd>The object directory that corresponds to the <tt>$srcdir</tt>.</dd>

    <dt><b>subdir</b></dt>
    <dd>A partial path from the <tt>test</tt> directory that contains the 
    sub-directory that contains the test source being executed.</dd>

    <dt><b>srcroot</b></dt>
    <dd>The root directory of the LLVM src tree.</dd>

    <dt><b>objroot</b></dt>
    <dd>The root directory of the LLVM object tree. This could be the same
    as the srcroot.</dd>

    <dt><b>path</b><dt>
    <dd>The path to the directory that contains the test case source.  This is 
    for locating any supporting files that are not generated by the test, but 
    used by the test.</dd>

    <dt><b>tmp</b></dt>
    <dd>The path to a temporary file name that could be used for this test case.
    The file name won't conflict with other test cases. You can append to it if
    you need multiple temporaries. This is useful as the destination of some
    redirected output.</dd>

    <dt><b>llvmlibsdir</b> (%llvmlibsdir)</dt>
    <dd>The directory where the LLVM libraries are located.</dd>

    <dt><b>target_triplet</b> (%target_triplet)</dt>
    <dd>The target triplet that corresponds to the current host machine (the one
    running the test cases). This should probably be called "host".<dd>

    <dt><b>llvmgcc</b> (%llvmgcc)</dt>
    <dd>The full path to the <tt>llvm-gcc</tt> executable as specified in the
    configured LLVM environment</dd>

    <dt><b>llvmgxx</b> (%llvmgxx)</dt>
    <dd>The full path to the <tt>llvm-gxx</tt> executable as specified in the
    configured LLVM environment</dd>

    <dt><b>gccpath</b></dt>
    <dd>The full path to the C compiler used to <i>build </i> LLVM. Note that 
    this might not be gcc.</dd>

    <dt><b>gxxpath</b></dt>
    <dd>The full path to the C++ compiler used to <i>build </i> LLVM. Note that 
    this might not be g++.</dd>

    <dt><b>compile_c</b> (%compile_c)</dt>
    <dd>The full command line used to compile LLVM C source  code. This has all 
    the configured -I, -D and optimization options.</dd>

    <dt><b>compile_cxx</b> (%compile_cxx)</dt>
    <dd>The full command used to compile LLVM C++ source  code. This has 
    all the configured -I, -D and optimization options.</dd>

    <dt><b>link</b> (%link)</dt> 
    <dd>This full link command used to link LLVM executables. This has all the
    configured -I, -L and -l options.</dd>

    <dt><b>shlibext</b> (%shlibext)</dt>
    <dd>The suffix for the host platforms share library (dll) files. This
    includes the period as the first character.</dd>
  </dl>
  <p>To add more variables, two things need to be changed. First, add a line in
  the <tt>test/Makefile</tt> that creates the <tt>site.exp</tt> file. This will
  "set" the variable as a global in the site.exp file. Second, in the
  <tt>test/lib/llvm.exp</tt> file, in the substitute proc, add the variable name
  to the list of "global" declarations at the beginning of the proc. That's it,
  the variable can then be used in test scripts.</p>
</div>
  
<!-- _______________________________________________________________________ -->
<div class="doc_subsection"><a name="dgfeatures">Other Features</a></div>
<!-- _______________________________________________________________________ -->
<div class="doc_text">
  <p>To make RUN line writing easier, there are several shell scripts located
  in the <tt>llvm/test/Scripts</tt> directory. This directory is in the PATH
  when running tests, so you can just call these scripts using their name. For
  example:</p>
  <dl>
    <dt><b>ignore</b></dt>
    <dd>This script runs its arguments and then always returns 0. This is useful
    in cases where the test needs to cause a tool to generate an error (e.g. to
    check the error output). However, any program in a pipeline that returns a
    non-zero result will cause the test to fail. This script overcomes that 
    issue and nicely documents that the test case is purposefully ignoring the
    result code of the tool</dd>

    <dt><b>not</b></dt>
    <dd>This script runs its arguments and then inverts the result code from 
    it. Zero result codes become 1. Non-zero result codes become 0. This is
    useful to invert the result of a grep. For example "not grep X" means
    succeed only if you don't find X in the input.</dd>
  </dl>

  <p>Sometimes it is necessary to mark a test case as "expected fail" or XFAIL.
  You can easily mark a test as XFAIL just by including <tt>XFAIL: </tt> on a
  line near the top of the file. This signals that the test case should succeed
  if the test fails. Such test cases are counted separately by DejaGnu. To
  specify an expected fail, use the XFAIL keyword in the comments of the test
  program followed by a colon and one or more regular expressions (separated by
  a comma). The regular expressions allow you to XFAIL the test conditionally by
  host platform. The regular expressions following the : are matched against the
  target triplet for the host machine. If there is a match, the test is expected
  to fail. If not, the test is expected to succeed. To XFAIL everywhere just
  specify <tt>XFAIL: *</tt>. Here is an example of an <tt>XFAIL</tt> line:</p>

<div class="doc_code">
<pre>
; XFAIL: darwin,sun
</pre>
</div>

  <p>To make the output more useful, the <tt>llvm_runtest</tt> function wil
  scan the lines of the test case for ones that contain a pattern that matches
  PR[0-9]+. This is the syntax for specifying a PR (Problem Report) number that
  is related to the test case. The number after "PR" specifies the LLVM bugzilla
  number. When a PR number is specified, it will be used in the pass/fail
  reporting. This is useful to quickly get some context when a test fails.</p>

  <p>Finally, any line that contains "END." will cause the special
  interpretation of lines to terminate. This is generally done right after the
  last RUN: line. This has two side effects: (a) it prevents special
  interpretation of lines that are part of the test program, not the
  instructions to the test case, and (b) it speeds things up for really big test
  cases by avoiding interpretation of the remainder of the file.</p>

</div>

<!--=========================================================================-->
<div class="doc_section"><a name="testsuitestructure">Test suite
Structure</a></div>
<!--=========================================================================-->

<div class="doc_text">

<p>The <tt>test-suite</tt> module contains a number of programs that can be compiled 
with LLVM and executed. These programs are compiled using the native compiler
and various LLVM backends. The output from the program compiled with the 
native compiler is assumed correct; the results from the other programs are
compared to the native program output and pass if they match.</p>

<p>When executing tests, it is usually a good idea to start out with a subset of
the available tests or programs. This makes test run times smaller at first and
later on this is useful to investigate individual test failures. To run some
test only on a subset of programs, simply change directory to the programs you
want tested and run <tt>gmake</tt> there. Alternatively, you can run a different
test using the <tt>TEST</tt> variable to change what tests or run on the
selected programs (see below for more info).</p>

<p>In addition for testing correctness, the <tt>llvm-test</tt> directory also
performs timing tests of various LLVM optimizations.  It also records
compilation times for the compilers and the JIT.  This information can be
used to compare the effectiveness of LLVM's optimizations and code
generation.</p>

<p><tt>llvm-test</tt> tests are divided into three types of tests: MultiSource,
SingleSource, and External.</p> 

<ul>
<li><tt>llvm-test/SingleSource</tt>
<p>The SingleSource directory contains test programs that are only a single 
source file in size.  These are usually small benchmark programs or small 
programs that calculate a particular value.  Several such programs are grouped 
together in each directory.</p></li>

<li><tt>llvm-test/MultiSource</tt>
<p>The MultiSource directory contains subdirectories which contain entire 
programs with multiple source files.  Large benchmarks and whole applications 
go here.</p></li>

<li><tt>llvm-test/External</tt>
<p>The External directory contains Makefiles for building code that is external
to (i.e., not distributed with) LLVM.  The most prominent members of this
directory are the SPEC 95 and SPEC 2000 benchmark suites. The <tt>External</tt>
directory does not contain these actual tests, but only the Makefiles that know
how to properly compile these programs from somewhere else. The presence and
location of these external programs is configured by the llvm-test
<tt>configure</tt> script.</p></li>
</ul>

<p>Each tree is then subdivided into several categories, including applications,
benchmarks, regression tests, code that is strange grammatically, etc.  These
organizations should be relatively self explanatory.</p>

<p>Some tests are known to fail.  Some are bugs that we have not fixed yet;
others are features that we haven't added yet (or may never add).  In DejaGNU,
the result for such tests will be XFAIL (eXpected FAILure).  In this way, you
can tell the difference between an expected and unexpected failure.</p>

<p>The tests in the test suite have no such feature at this time. If the
test passes, only warnings and other miscellaneous output will be generated.  If
a test fails, a large &lt;program&gt; FAILED message will be displayed.  This
will help you separate benign warnings from actual test failures.</p>

</div>

<!--=========================================================================-->
<div class="doc_section"><a name="testsuiterun">Running the test suite</a></div>
<!--=========================================================================-->

<div class="doc_text">

<p>First, all tests are executed within the LLVM object directory tree.  They
<i>are not</i> executed inside of the LLVM source tree. This is because the
test suite creates temporary files during execution.</p>

<p>To run the test suite, you need to use the following steps:</p>

<ol>
  <li><tt>cd</tt> into the <tt>llvm/projects</tt> directory in your source tree.
  </li>

  <li><p>Check out the <tt>test-suite</tt> module with:</p>

<div class="doc_code">
<pre>
% svn co http://llvm.org/svn/llvm-project/test-suite/trunk test-suite
</pre>
</div>
    <p>This will get the test suite into <tt>llvm/projects/test-suite</tt>.</p>
  </li>
  <li><p>Configure and build <tt>llvm</tt>.</p></li>
  <li><p>Configure and build <tt>llvm-gcc</tt>.</p></li>
  <li><p>Install <tt>llvm-gcc</tt> somewhere.</p></li>
  <li><p><em>Re-configure</em> <tt>llvm</tt> from the top level of
      each build tree (LLVM object directory tree) in which you want
      to run the test suite, just as you do before building LLVM.</p>
    <p>During the <em>re-configuration</em>, you must either: (1)
      have <tt>llvm-gcc</tt> you just built in your path, or (2)
      specify the directory where your just-built <tt>llvm-gcc</tt> is
      installed using <tt>--with-llvmgccdir=$LLVM_GCC_DIR</tt>.</p>
    <p>You must also tell the configure machinery that the test suite
      is available so it can be configured for your build tree:</p>
<div class="doc_code">
<pre>
% cd $LLVM_OBJ_ROOT ; $LLVM_SRC_ROOT/configure [--with-llvmgccdir=$LLVM_GCC_DIR]
</pre>
</div>
    <p>[Remember that <tt>$LLVM_GCC_DIR</tt> is the directory where you
    <em>installed</em> llvm-gcc, not its src or obj directory.]</p>
  </li>

  <li><p>You can now run the test suite from your build tree as follows:</p>
<div class="doc_code">
<pre>
% cd $LLVM_OBJ_ROOT/projects/test-suite
% make
</pre>
</div>
  </li>
</ol>
<p>Note that the second and third steps only need to be done once. After you
have the suite checked out and configured, you don't need to do it again (unless
the test code or configure script changes).</p>

</div>

<!-- _______________________________________________________________________ -->
<div class="doc_subsection">
<a name="testsuiteexternal">Configuring External Tests</a></div>
<!-- _______________________________________________________________________ -->

<div class="doc_text">
<p>In order to run the External tests in the <tt>test-suite</tt>
  module, you must specify <i>--with-externals</i>.  This
  must be done during the <em>re-configuration</em> step (see above),
  and the <tt>llvm</tt> re-configuration must recognize the
  previously-built <tt>llvm-gcc</tt>.  If any of these is missing or
  neglected, the External tests won't work.</p>
<dl>
<dt><i>--with-externals</i></dt>
<dt><i>--with-externals=&lt;<tt>directory</tt>&gt;</i></dt>
</dl>
  This tells LLVM where to find any external tests.  They are expected to be
  in specifically named subdirectories of &lt;<tt>directory</tt>&gt;.
  If <tt>directory</tt> is left unspecified,
  <tt>configure</tt> uses the default value
  <tt>/home/vadve/shared/benchmarks/speccpu2000/benchspec</tt>.
  Subdirectory names known to LLVM include:
  <dl>
  <dt>spec95</dt>
  <dt>speccpu2000</dt>
  <dt>speccpu2006</dt>
  <dt>povray31</dt>
  </dl>
  Others are added from time to time, and can be determined from 
  <tt>configure</tt>.
</div>

<!-- _______________________________________________________________________ -->
<div class="doc_subsection">
<a name="testsuitetests">Running different tests</a></div>
<!-- _______________________________________________________________________ -->
<div class="doc_text">
<p>In addition to the regular "whole program" tests, the <tt>test-suite</tt>
module also provides a mechanism for compiling the programs in different ways.
If the variable TEST is defined on the <tt>gmake</tt> command line, the test system will
include a Makefile named <tt>TEST.&lt;value of TEST variable&gt;.Makefile</tt>.
This Makefile can modify build rules to yield different results.</p>

<p>For example, the LLVM nightly tester uses <tt>TEST.nightly.Makefile</tt> to
create the nightly test reports.  To run the nightly tests, run <tt>gmake
TEST=nightly</tt>.</p>

<p>There are several TEST Makefiles available in the tree.  Some of them are
designed for internal LLVM research and will not work outside of the LLVM
research group.  They may still be valuable, however, as a guide to writing your
own TEST Makefile for any optimization or analysis passes that you develop with
LLVM.</p>

</div>

<!-- _______________________________________________________________________ -->
<div class="doc_subsection">
<a name="testsuiteoutput">Generating test output</a></div>
<!-- _______________________________________________________________________ -->
<div class="doc_text">
  <p>There are a number of ways to run the tests and generate output. The most
  simple one is simply running <tt>gmake</tt> with no arguments. This will
  compile and run all programs in the tree using a number of different methods
  and compare results. Any failures are reported in the output, but are likely
  drowned in the other output. Passes are not reported explicitely.</p>

  <p>Somewhat better is running <tt>gmake TEST=sometest test</tt>, which runs
  the specified test and usually adds per-program summaries to the output
  (depending on which sometest you use). For example, the <tt>nightly</tt> test
  explicitely outputs TEST-PASS or TEST-FAIL for every test after each program.
  Though these lines are still drowned in the output, it's easy to grep the
  output logs in the Output directories.</p>

  <p>Even better are the <tt>report</tt> and <tt>report.format</tt> targets
  (where <tt>format</tt> is one of <tt>html</tt>, <tt>csv</tt>, <tt>text</tt> or
  <tt>graphs</tt>). The exact contents of the report are dependent on which
  <tt>TEST</tt> you are running, but the text results are always shown at the
  end of the run and the results are always stored in the
  <tt>report.&lt;type&gt;.format</tt> file (when running with
  <tt>TEST=&lt;type&gt;</tt>).

  The <tt>report</tt> also generate a file called
  <tt>report.&lt;type&gt;.raw.out</tt> containing the output of the entire test
  run.
</div>

<!-- _______________________________________________________________________ -->
<div class="doc_subsection">
<a name="testsuitecustom">Writing custom tests for the test suite</a></div>
<!-- _______________________________________________________________________ -->

<div class="doc_text">

<p>Assuming you can run the test suite, (e.g. "<tt>gmake TEST=nightly report</tt>"
should work), it is really easy to run optimizations or code generator
components against every program in the tree, collecting statistics or running
custom checks for correctness.  At base, this is how the nightly tester works,
it's just one example of a general framework.</p>

<p>Lets say that you have an LLVM optimization pass, and you want to see how
many times it triggers.  First thing you should do is add an LLVM
<a href="ProgrammersManual.html#Statistic">statistic</a> to your pass, which
will tally counts of things you care about.</p>

<p>Following this, you can set up a test and a report that collects these and
formats them for easy viewing.  This consists of two files, an
"<tt>test-suite/TEST.XXX.Makefile</tt>" fragment (where XXX is the name of your
test) and an "<tt>llvm-test/TEST.XXX.report</tt>" file that indicates how to
format the output into a table.  There are many example reports of various
levels of sophistication included with the test suite, and the framework is very
general.</p>

<p>If you are interested in testing an optimization pass, check out the
"libcalls" test as an example.  It can be run like this:<p>

<div class="doc_code">
<pre>
% cd llvm/projects/test-suite/MultiSource/Benchmarks  # or some other level
% make TEST=libcalls report
</pre>
</div>

<p>This will do a bunch of stuff, then eventually print a table like this:</p>

<div class="doc_code">
<pre>
Name                                  | total | #exit |
...
FreeBench/analyzer/analyzer           | 51    | 6     | 
FreeBench/fourinarow/fourinarow       | 1     | 1     | 
FreeBench/neural/neural               | 19    | 9     | 
FreeBench/pifft/pifft                 | 5     | 3     | 
MallocBench/cfrac/cfrac               | 1     | *     | 
MallocBench/espresso/espresso         | 52    | 12    | 
MallocBench/gs/gs                     | 4     | *     | 
Prolangs-C/TimberWolfMC/timberwolfmc  | 302   | *     | 
Prolangs-C/agrep/agrep                | 33    | 12    | 
Prolangs-C/allroots/allroots          | *     | *     | 
Prolangs-C/assembler/assembler        | 47    | *     | 
Prolangs-C/bison/mybison              | 74    | *     | 
...
</pre>
</div>

<p>This basically is grepping the -stats output and displaying it in a table.
You can also use the "TEST=libcalls report.html" target to get the table in HTML
form, similarly for report.csv and report.tex.</p>

<p>The source for this is in test-suite/TEST.libcalls.*.  The format is pretty
simple: the Makefile indicates how to run the test (in this case, 
"<tt>opt -simplify-libcalls -stats</tt>"), and the report contains one line for
each column of the output.  The first value is the header for the column and the
second is the regex to grep the output of the command for.  There are lots of
example reports that can do fancy stuff.</p>

</div>

<!--=========================================================================-->
<div class="doc_section"><a name="nightly">Running the nightly tester</a></div>
<!--=========================================================================-->

<div class="doc_text">

<p>
The <a href="http://llvm.org/nightlytest/">LLVM Nightly Testers</a>
automatically check out an LLVM tree, build it, run the "nightly" 
program test (described above), run all of the DejaGNU tests, 
delete the checked out tree, and then submit the results to 
<a href="http://llvm.org/nightlytest/">http://llvm.org/nightlytest/</a>. 
After test results are submitted to 
<a href="http://llvm.org/nightlytest/">http://llvm.org/nightlytest/</a>,
they are processed and displayed on the tests page. An email to 
<a href="http://lists.cs.uiuc.edu/pipermail/llvm-testresults/">
llvm-testresults@cs.uiuc.edu</a> summarizing the results is also generated. 
This testing scheme is designed to ensure that programs don't break as well 
as keep track of LLVM's progress over time.</p>

<p>If you'd like to set up an instance of the nightly tester to run on your 
machine, take a look at the comments at the top of the 
<tt>utils/NewNightlyTest.pl</tt> file. If you decide to set up a nightly tester 
please choose a unique nickname and invoke <tt>utils/NewNightlyTest.pl</tt> 
with the "-nickname [yournickname]" command line option. 

<p>You can create a shell script to encapsulate the running of the script.
The optimized x86 Linux nightly test is run from just such a script:</p>

<div class="doc_code">
<pre>
#!/bin/bash
BASE=/proj/work/llvm/nightlytest
export BUILDDIR=$BASE/build 
export WEBDIR=$BASE/testresults 
export LLVMGCCDIR=/proj/work/llvm/cfrontend/install
export PATH=/proj/install/bin:$LLVMGCCDIR/bin:$PATH
export LD_LIBRARY_PATH=/proj/install/lib
cd $BASE
cp /proj/work/llvm/llvm/utils/NewNightlyTest.pl .
nice ./NewNightlyTest.pl -nice -release -verbose -parallel -enable-linscan \
   -nickname NightlyTester -noexternals &gt; output.log 2&gt;&amp;1 
</pre>
</div>

<p>It is also possible to specify the the location your nightly test results
are submitted. You can do this by passing the command line option
"-submit-server [server_address]" and "-submit-script [script_on_server]" to
<tt>utils/NewNightlyTest.pl</tt>. For example, to submit to the llvm.org 
nightly test results page, you would invoke the nightly test script with 
"-submit-server llvm.org -submit-script /nightlytest/NightlyTestAccept.cgi". 
If these options are not specified, the nightly test script sends the results 
to the llvm.org nightly test results page.</p>

<p>Take a look at the <tt>NewNightlyTest.pl</tt> file to see what all of the
flags and strings do.  If you start running the nightly tests, please let us
know. Thanks!</p>

</div>

<!-- *********************************************************************** -->

<hr>
<address>
  <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
  src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
  <a href="http://validator.w3.org/check/referer"><img
  src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01"></a>

  John T. Criswell, Reid Spencer, and Tanya Lattner<br>
  <a href="http://llvm.org">The LLVM Compiler Infrastructure</a><br>
  Last modified: $Date$
</address>
</body>
</html>