2012-03-16 06:19:35 +08:00
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<title>LLVM test-suite Makefile Guide</title>
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2012-04-20 04:20:34 +08:00
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<link rel="stylesheet" href="_static/llvm.css" type="text/css">
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2012-03-16 06:19:35 +08:00
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</head>
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<body>
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<h1>
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LLVM test-suite Makefile Guide
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</h1>
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<ol>
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<li><a href="#overview">Overview</a></li>
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<li><a href="#testsuitestructure">Test suite structure</a></li>
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<li><a href="#testsuiterun">Running the test suite</a>
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<ul>
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<li><a href="#testsuiteexternal">Configuring External Tests</a></li>
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<li><a href="#testsuitetests">Running different tests</a></li>
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<li><a href="#testsuiteoutput">Generating test output</a></li>
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<li><a href="#testsuitecustom">Writing custom tests for test-suite</a></li>
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</ul>
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</li>
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</ol>
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<div class="doc_author">
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<p>Written by John T. Criswell, Daniel Dunbar, Reid Spencer, and Tanya Lattner</p>
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</div>
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<!--=========================================================================-->
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<h2><a name="overview">Overview</a></h2>
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<!--=========================================================================-->
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<div>
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<p>This document describes the features of the Makefile-based LLVM
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test-suite. This way of interacting with the test-suite is deprecated in favor
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of running the test-suite using LNT, but may continue to prove useful for some
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users. See the Testing
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Guide's <a href="TestingGuide.html#testsuitequickstart">test-suite
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Quickstart</a> section for more information.</p>
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</div>
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<!--=========================================================================-->
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<h2><a name="testsuitestructure">Test suite Structure</a></h2>
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<!--=========================================================================-->
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<div>
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<p>The <tt>test-suite</tt> module contains a number of programs that can be compiled
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with LLVM and executed. These programs are compiled using the native compiler
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and various LLVM backends. The output from the program compiled with the
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native compiler is assumed correct; the results from the other programs are
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compared to the native program output and pass if they match.</p>
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<p>When executing tests, it is usually a good idea to start out with a subset of
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the available tests or programs. This makes test run times smaller at first and
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later on this is useful to investigate individual test failures. To run some
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test only on a subset of programs, simply change directory to the programs you
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want tested and run <tt>gmake</tt> there. Alternatively, you can run a different
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test using the <tt>TEST</tt> variable to change what tests or run on the
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selected programs (see below for more info).</p>
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<p>In addition for testing correctness, the <tt>test-suite</tt> directory also
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performs timing tests of various LLVM optimizations. It also records
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compilation times for the compilers and the JIT. This information can be
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used to compare the effectiveness of LLVM's optimizations and code
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generation.</p>
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<p><tt>test-suite</tt> tests are divided into three types of tests: MultiSource,
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SingleSource, and External.</p>
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<ul>
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<li><tt>test-suite/SingleSource</tt>
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<p>The SingleSource directory contains test programs that are only a single
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source file in size. These are usually small benchmark programs or small
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programs that calculate a particular value. Several such programs are grouped
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together in each directory.</p></li>
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<li><tt>test-suite/MultiSource</tt>
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<p>The MultiSource directory contains subdirectories which contain entire
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programs with multiple source files. Large benchmarks and whole applications
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go here.</p></li>
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<li><tt>test-suite/External</tt>
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<p>The External directory contains Makefiles for building code that is external
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to (i.e., not distributed with) LLVM. The most prominent members of this
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directory are the SPEC 95 and SPEC 2000 benchmark suites. The <tt>External</tt>
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directory does not contain these actual tests, but only the Makefiles that know
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how to properly compile these programs from somewhere else. The presence and
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location of these external programs is configured by the test-suite
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<tt>configure</tt> script.</p></li>
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</ul>
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<p>Each tree is then subdivided into several categories, including applications,
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benchmarks, regression tests, code that is strange grammatically, etc. These
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organizations should be relatively self explanatory.</p>
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<p>Some tests are known to fail. Some are bugs that we have not fixed yet;
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others are features that we haven't added yet (or may never add). In the
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regression tests, the result for such tests will be XFAIL (eXpected FAILure).
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In this way, you can tell the difference between an expected and unexpected
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failure.</p>
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<p>The tests in the test suite have no such feature at this time. If the
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test passes, only warnings and other miscellaneous output will be generated. If
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a test fails, a large <program> FAILED message will be displayed. This
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will help you separate benign warnings from actual test failures.</p>
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</div>
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<!--=========================================================================-->
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<h2><a name="testsuiterun">Running the test suite</a></h2>
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<!--=========================================================================-->
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<div>
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<p>First, all tests are executed within the LLVM object directory tree. They
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<i>are not</i> executed inside of the LLVM source tree. This is because the
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test suite creates temporary files during execution.</p>
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<p>To run the test suite, you need to use the following steps:</p>
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<ol>
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<li><tt>cd</tt> into the <tt>llvm/projects</tt> directory in your source tree.
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</li>
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<li><p>Check out the <tt>test-suite</tt> module with:</p>
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<div class="doc_code">
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<pre>
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% svn co http://llvm.org/svn/llvm-project/test-suite/trunk test-suite
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</pre>
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</div>
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<p>This will get the test suite into <tt>llvm/projects/test-suite</tt>.</p>
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</li>
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<li><p>Configure and build <tt>llvm</tt>.</p></li>
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<li><p>Configure and build <tt>llvm-gcc</tt>.</p></li>
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<li><p>Install <tt>llvm-gcc</tt> somewhere.</p></li>
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<li><p><em>Re-configure</em> <tt>llvm</tt> from the top level of
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each build tree (LLVM object directory tree) in which you want
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to run the test suite, just as you do before building LLVM.</p>
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<p>During the <em>re-configuration</em>, you must either: (1)
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have <tt>llvm-gcc</tt> you just built in your path, or (2)
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specify the directory where your just-built <tt>llvm-gcc</tt> is
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installed using <tt>--with-llvmgccdir=$LLVM_GCC_DIR</tt>.</p>
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<p>You must also tell the configure machinery that the test suite
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is available so it can be configured for your build tree:</p>
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<div class="doc_code">
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<pre>
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% cd $LLVM_OBJ_ROOT ; $LLVM_SRC_ROOT/configure [--with-llvmgccdir=$LLVM_GCC_DIR]
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</pre>
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</div>
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<p>[Remember that <tt>$LLVM_GCC_DIR</tt> is the directory where you
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<em>installed</em> llvm-gcc, not its src or obj directory.]</p>
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</li>
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<li><p>You can now run the test suite from your build tree as follows:</p>
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<div class="doc_code">
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<pre>
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% cd $LLVM_OBJ_ROOT/projects/test-suite
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% make
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</pre>
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</div>
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</li>
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</ol>
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<p>Note that the second and third steps only need to be done once. After you
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have the suite checked out and configured, you don't need to do it again (unless
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the test code or configure script changes).</p>
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<!-- _______________________________________________________________________ -->
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<h3>
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<a name="testsuiteexternal">Configuring External Tests</a>
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</h3>
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<!-- _______________________________________________________________________ -->
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<div>
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<p>In order to run the External tests in the <tt>test-suite</tt>
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module, you must specify <i>--with-externals</i>. This
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must be done during the <em>re-configuration</em> step (see above),
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and the <tt>llvm</tt> re-configuration must recognize the
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previously-built <tt>llvm-gcc</tt>. If any of these is missing or
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neglected, the External tests won't work.</p>
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<dl>
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<dt><i>--with-externals</i></dt>
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<dt><i>--with-externals=<<tt>directory</tt>></i></dt>
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</dl>
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This tells LLVM where to find any external tests. They are expected to be
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in specifically named subdirectories of <<tt>directory</tt>>.
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If <tt>directory</tt> is left unspecified,
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<tt>configure</tt> uses the default value
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<tt>/home/vadve/shared/benchmarks/speccpu2000/benchspec</tt>.
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Subdirectory names known to LLVM include:
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<dl>
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<dt>spec95</dt>
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<dt>speccpu2000</dt>
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<dt>speccpu2006</dt>
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<dt>povray31</dt>
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</dl>
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Others are added from time to time, and can be determined from
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<tt>configure</tt>.
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</div>
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<!-- _______________________________________________________________________ -->
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<h3>
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<a name="testsuitetests">Running different tests</a>
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</h3>
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<!-- _______________________________________________________________________ -->
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<div>
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<p>In addition to the regular "whole program" tests, the <tt>test-suite</tt>
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module also provides a mechanism for compiling the programs in different ways.
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If the variable TEST is defined on the <tt>gmake</tt> command line, the test system will
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include a Makefile named <tt>TEST.<value of TEST variable>.Makefile</tt>.
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This Makefile can modify build rules to yield different results.</p>
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<p>For example, the LLVM nightly tester uses <tt>TEST.nightly.Makefile</tt> to
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create the nightly test reports. To run the nightly tests, run <tt>gmake
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TEST=nightly</tt>.</p>
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<p>There are several TEST Makefiles available in the tree. Some of them are
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designed for internal LLVM research and will not work outside of the LLVM
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research group. They may still be valuable, however, as a guide to writing your
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own TEST Makefile for any optimization or analysis passes that you develop with
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LLVM.</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<h3>
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<a name="testsuiteoutput">Generating test output</a>
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</h3>
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<!-- _______________________________________________________________________ -->
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<div>
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<p>There are a number of ways to run the tests and generate output. The most
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simple one is simply running <tt>gmake</tt> with no arguments. This will
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compile and run all programs in the tree using a number of different methods
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and compare results. Any failures are reported in the output, but are likely
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drowned in the other output. Passes are not reported explicitely.</p>
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<p>Somewhat better is running <tt>gmake TEST=sometest test</tt>, which runs
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the specified test and usually adds per-program summaries to the output
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(depending on which sometest you use). For example, the <tt>nightly</tt> test
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explicitely outputs TEST-PASS or TEST-FAIL for every test after each program.
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Though these lines are still drowned in the output, it's easy to grep the
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output logs in the Output directories.</p>
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<p>Even better are the <tt>report</tt> and <tt>report.format</tt> targets
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(where <tt>format</tt> is one of <tt>html</tt>, <tt>csv</tt>, <tt>text</tt> or
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<tt>graphs</tt>). The exact contents of the report are dependent on which
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<tt>TEST</tt> you are running, but the text results are always shown at the
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end of the run and the results are always stored in the
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<tt>report.<type>.format</tt> file (when running with
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<tt>TEST=<type></tt>).
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The <tt>report</tt> also generate a file called
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<tt>report.<type>.raw.out</tt> containing the output of the entire test
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run.
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</div>
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<!-- _______________________________________________________________________ -->
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<h3>
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<a name="testsuitecustom">Writing custom tests for the test suite</a>
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</h3>
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<!-- _______________________________________________________________________ -->
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<div>
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<p>Assuming you can run the test suite, (e.g. "<tt>gmake TEST=nightly report</tt>"
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should work), it is really easy to run optimizations or code generator
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components against every program in the tree, collecting statistics or running
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custom checks for correctness. At base, this is how the nightly tester works,
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it's just one example of a general framework.</p>
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<p>Lets say that you have an LLVM optimization pass, and you want to see how
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many times it triggers. First thing you should do is add an LLVM
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<a href="ProgrammersManual.html#Statistic">statistic</a> to your pass, which
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will tally counts of things you care about.</p>
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<p>Following this, you can set up a test and a report that collects these and
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formats them for easy viewing. This consists of two files, a
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"<tt>test-suite/TEST.XXX.Makefile</tt>" fragment (where XXX is the name of your
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test) and a "<tt>test-suite/TEST.XXX.report</tt>" file that indicates how to
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format the output into a table. There are many example reports of various
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levels of sophistication included with the test suite, and the framework is very
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general.</p>
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<p>If you are interested in testing an optimization pass, check out the
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"libcalls" test as an example. It can be run like this:<p>
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<div class="doc_code">
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<pre>
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% cd llvm/projects/test-suite/MultiSource/Benchmarks # or some other level
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% make TEST=libcalls report
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</pre>
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</div>
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<p>This will do a bunch of stuff, then eventually print a table like this:</p>
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<div class="doc_code">
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<pre>
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Name | total | #exit |
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...
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FreeBench/analyzer/analyzer | 51 | 6 |
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FreeBench/fourinarow/fourinarow | 1 | 1 |
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FreeBench/neural/neural | 19 | 9 |
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FreeBench/pifft/pifft | 5 | 3 |
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MallocBench/cfrac/cfrac | 1 | * |
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MallocBench/espresso/espresso | 52 | 12 |
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MallocBench/gs/gs | 4 | * |
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Prolangs-C/TimberWolfMC/timberwolfmc | 302 | * |
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Prolangs-C/agrep/agrep | 33 | 12 |
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Prolangs-C/allroots/allroots | * | * |
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Prolangs-C/assembler/assembler | 47 | * |
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Prolangs-C/bison/mybison | 74 | * |
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...
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</pre>
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</div>
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<p>This basically is grepping the -stats output and displaying it in a table.
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You can also use the "TEST=libcalls report.html" target to get the table in HTML
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form, similarly for report.csv and report.tex.</p>
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<p>The source for this is in test-suite/TEST.libcalls.*. The format is pretty
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simple: the Makefile indicates how to run the test (in this case,
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"<tt>opt -simplify-libcalls -stats</tt>"), and the report contains one line for
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each column of the output. The first value is the header for the column and the
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second is the regex to grep the output of the command for. There are lots of
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example reports that can do fancy stuff.</p>
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</div>
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</div>
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John T. Criswell, Daniel Dunbar, Reid Spencer, and Tanya Lattner<br>
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<a href="http://llvm.org/">The LLVM Compiler Infrastructure</a><br>
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