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All of LLVM's testing features are now referred to as the "Testing infrastructure", the DejaGNU tests are just that, and the whole program tests are referred to as the "test suite". llvm-svn: 52674
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975 lines
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<title>LLVM Testing Infrastructure Guide</title>
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<link rel="stylesheet" href="llvm.css" type="text/css">
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</head>
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<body>
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<div class="doc_title">
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LLVM Testing Infrastructure Guide
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</div>
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<ol>
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<li><a href="#overview">Overview</a></li>
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<li><a href="#requirements">Requirements</a></li>
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<li><a href="#org">LLVM testing infrastructure organization</a>
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<ul>
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<li><a href="#dejagnu">DejaGNU tests</a></li>
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<li><a href="#testsuite">Test suite</a></li>
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</ul>
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</li>
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<li><a href="#quick">Quick start</a>
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<ul>
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<li><a href="#quickdejagnu">DejaGNU tests</a></li>
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<li><a href="#quicktestsuite">Test suite</a></li>
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</ul>
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</li>
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<li><a href="#dgstructure">DejaGNU structure</a>
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<ul>
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<li><a href="#dgcustom">Writing new DejaGNU tests</a></li>
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<li><a href="#dgvars">Variables and substitutions</a></li>
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<li><a href="#dgfeatures">Other features</a></li>
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</ul>
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</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 llvm-test</a></li>
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</ul>
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</li>
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<li><a href="#nightly">Running the nightly tester</a></li>
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</ol>
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<div class="doc_author">
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<p>Written by John T. Criswell, <a
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href="http://llvm.x10sys.com/rspencer">Reid Spencer</a>, and Tanya Lattner</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_section"><a name="overview">Overview</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>This document is the reference manual for the LLVM testing infrastructure. It documents
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the structure of the LLVM testing infrastructure, the tools needed to use it,
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and how to add and run tests.</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_section"><a name="requirements">Requirements</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>In order to use the LLVM testing infrastructure, you will need all of the software
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required to build LLVM, plus the following:</p>
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<dl>
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<dt><a href="http://www.gnu.org/software/dejagnu/">DejaGNU</a></dt>
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<dd>The Feature and Regressions tests are organized and run by DejaGNU.</dd>
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<dt><a href="http://expect.nist.gov/">Expect</a></dt>
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<dd>Expect is required by DejaGNU.</dd>
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<dt><a href="http://www.tcl.tk/software/tcltk/">tcl</a></dt>
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<dd>Tcl is required by DejaGNU. </dd>
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<dt><a href="http://www.netlib.org/f2c">F2C</a></dt>
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<dd>For now, LLVM does not have a Fortran front-end, but using F2C, we can run
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Fortran benchmarks. F2C support must be enabled via <tt>configure</tt> if not
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installed in a standard place. F2C requires three items: the <tt>f2c</tt>
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executable, <tt>f2c.h</tt> to compile the generated code, and <tt>libf2c.a</tt>
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to link generated code. By default, given an F2C directory <tt>$DIR</tt>, the
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configure script will search <tt>$DIR/bin</tt> for <tt>f2c</tt>,
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<tt>$DIR/include</tt> for <tt>f2c.h</tt>, and <tt>$DIR/lib</tt> for
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<tt>libf2c.a</tt>. The default <tt>$DIR</tt> values are: <tt>/usr</tt>,
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<tt>/usr/local</tt>, <tt>/sw</tt>, and <tt>/opt</tt>. If you installed F2C in a
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different location, you must tell <tt>configure</tt>:
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<ul>
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<li><tt>./configure --with-f2c=$DIR</tt><br>
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This will specify a new <tt>$DIR</tt> for the above-described search
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process. This will only work if the binary, header, and library are in their
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respective subdirectories of <tt>$DIR</tt>.</li>
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<li><tt>./configure --with-f2c-bin=/binary/path --with-f2c-inc=/include/path
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--with-f2c-lib=/lib/path</tt><br>
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This allows you to specify the F2C components separately. Note: if you choose
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this route, you MUST specify all three components, and you need to only specify
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<em>directories</em> where the files are located; do NOT include the
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filenames themselves on the <tt>configure</tt> line.</li>
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</ul></dd>
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</dl>
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<p>Darwin (Mac OS X) developers can simplify the installation of Expect and tcl
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by using fink. <tt>fink install expect</tt> will install both. Alternatively,
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Darwinports users can use <tt>sudo port install expect</tt> to install Expect
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and tcl.</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_section"><a name="org">LLVM testing infrastructure organization</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>The LLVM testing infrastructure contains two major categories of tests: code
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fragments and whole programs. Code fragments are referred to as the "DejaGNU
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tests" and are in the <tt>llvm</tt> module in subversion under the
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<tt>llvm/test</tt> directory. The whole programs tests are referred to as the
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"Test suite" and are in the <tt>test-suite</tt> module in subversion.
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</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"><a name="dejagnu">DejaGNU tests</a></div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_text">
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<p>Code fragments are small pieces of code that test a specific feature of LLVM
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or trigger a specific bug in LLVM. They are usually written in LLVM assembly
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language, but can be written in other languages if the test targets a particular
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language front end. These tests are driven by the DejaGNU testing framework,
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which is hidden behind a few simple makefiles.</p>
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<p>These code fragments are not complete programs. The code generated from them is
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never executed to determine correct behavior.</p>
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<p>These code fragment tests are located in the <tt>llvm/test</tt>
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directory.</p>
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<p>Typically when a bug is found in LLVM, a regression test containing
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just enough code to reproduce the problem should be written and placed
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somewhere underneath this directory. In most cases, this will be a small
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piece of LLVM assembly language code, often distilled from an actual
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application or benchmark.</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"><a name="testsuite">Test suite</a></div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_text">
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<p>The test suite contains whole programs, which are pieces of
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code which can be compiled and linked into a stand-alone program that can be
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executed. These programs are generally written in high level languages such as
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C or C++, but sometimes they are written straight in LLVM assembly.</p>
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<p>These programs are compiled and then executed using several different
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methods (native compiler, LLVM C backend, LLVM JIT, LLVM native code generation,
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etc). The output of these programs is compared to ensure that LLVM is compiling
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the program correctly.</p>
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<p>In addition to compiling and executing programs, whole program tests serve as
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a way of benchmarking LLVM performance, both in terms of the efficiency of the
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programs generated as well as the speed with which LLVM compiles, optimizes, and
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generates code.</p>
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<p>The test-suite is located in the <tt>test-suite</tt> Subversion module.</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_section"><a name="quick">Quick start</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>The tests are located in two separate Subversion modules. The
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DejaGNU tests are in the main "llvm" module under the directory
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<tt>llvm/test</tt> (so you get these tests for free with the main llvm tree).
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The more comprehensive test suite that includes whole
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programs in C and C++ is in the <tt>test-suite</tt> module. This module should
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be checked out to the <tt>llvm/projects</tt> directory (don't use another name
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then the default "test-suite", for then the test suite will be run every time
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you run <tt>make</tt> in the main <tt>llvm</tt> directory).
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When you <tt>configure</tt> the <tt>llvm</tt> module,
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the <tt>test-suite</tt> directory will be automatically configured.
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Alternatively, you can configure the <tt>test-suite</tt> module manually.</p>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"><a name="quickdejagnu">DejaGNU tests</a></div>
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<!-- _______________________________________________________________________ -->
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<p>To run all of the simple tests in LLVM using DejaGNU, use the master Makefile
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in the <tt>llvm/test</tt> directory:</p>
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<div class="doc_code">
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<pre>
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% gmake -C llvm/test
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</pre>
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</div>
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<p>or</p>
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<div class="doc_code">
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<pre>
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% gmake check
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</pre>
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</div>
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<p>To run only a subdirectory of tests in <tt>llvm/test</tt> using DejaGNU (ie.
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Transforms), just set the TESTSUITE variable to the path of the
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subdirectory (relative to <tt>llvm/test</tt>):</p>
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<div class="doc_code">
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<pre>
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% gmake TESTSUITE=Transforms check
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</pre>
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</div>
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<p><b>Note: If you are running the tests with <tt>objdir != subdir</tt>, you
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must have run the complete testsuite before you can specify a
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subdirectory.</b></p>
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<p>To run only a single test, set <tt>TESTONE</tt> to its path (relative to
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<tt>llvm/test</tt>) and make the <tt>check-one</tt> target:</p>
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<div class="doc_code">
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<pre>
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% gmake TESTONE=Feature/basictest.ll check-one
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</pre>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"><a name="quicktestsuite">Test suite</a></div>
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<!-- _______________________________________________________________________ -->
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<p>To run the comprehensive test suite (tests that compile and execute whole
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programs), first checkout and setup the <tt>test-suite</tt> module:</p>
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<div class="doc_code">
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<pre>
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% cd llvm/projects
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% svn co http://llvm.org/svn/llvm-project/test-suite/trunk test-suite
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% cd ..
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% ./configure --with-llvmgccdir=$LLVM_GCC_DIR
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</pre>
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<p>where <tt>$LLVM_GCC_DIR</tt> is the directory where you <em>installed</em>
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llvm-gcc, not it's src or obj dir.</p>
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</div>
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<p>Then, run the entire test suite by running make in the <tt>test-suite</tt>
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directory:</p>
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<div class="doc_code">
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<pre>
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% cd projects/test-suite
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% gmake
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</pre>
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</div>
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<p>Usually, running the "nightly" set of tests is a good idea, and you can also
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let it generate a report by running:</p>
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<div class="doc_code">
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<pre>
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% cd projects/test-suite
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% gmake TEST=nightly report report.html
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</pre>
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</div>
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<p>Any of the above commands can also be run in a subdirectory of
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<tt>projects/test-suite</tt> to run the specified test only on the programs in
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that subdirectory.</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_section"><a name="dgstructure">DejaGNU structure</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>The LLVM DejaGNU tests are driven by DejaGNU together with GNU Make and are
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located in the <tt>llvm/test</tt> directory.
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<p>This directory contains a large array of small tests
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that exercise various features of LLVM and to ensure that regressions do not
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occur. The directory is broken into several sub-directories, each focused on
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a particular area of LLVM. A few of the important ones are:</p>
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<ul>
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<li><tt>Analysis</tt>: checks Analysis passes.</li>
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<li><tt>Archive</tt>: checks the Archive library.</li>
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<li><tt>Assembler</tt>: checks Assembly reader/writer functionality.</li>
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<li><tt>Bitcode</tt>: checks Bitcode reader/writer functionality.</li>
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<li><tt>CodeGen</tt>: checks code generation and each target.</li>
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<li><tt>Features</tt>: checks various features of the LLVM language.</li>
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<li><tt>Linker</tt>: tests bitcode linking.</li>
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<li><tt>Transforms</tt>: tests each of the scalar, IPO, and utility
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transforms to ensure they make the right transformations.</li>
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<li><tt>Verifier</tt>: tests the IR verifier.</li>
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</ul>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"><a name="dgcustom">Writing new DejaGNU tests</a></div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_text">
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<p>The DejaGNU structure is very simple, but does require some information to
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be set. This information is gathered via <tt>configure</tt> and is written
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to a file, <tt>site.exp</tt> in <tt>llvm/test</tt>. The <tt>llvm/test</tt>
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Makefile does this work for you.</p>
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<p>In order for DejaGNU to work, each directory of tests must have a
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<tt>dg.exp</tt> file. DejaGNU looks for this file to determine how to run the
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tests. This file is just a Tcl script and it can do anything you want, but
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we've standardized it for the LLVM regression tests. If you're adding a
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directory of tests, just copy <tt>dg.exp</tt> from another directory to get
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running. The standard <tt>dg.exp</tt> simply loads a Tcl
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library (<tt>test/lib/llvm.exp</tt>) and calls the <tt>llvm_runtests</tt>
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function defined in that library with a list of file names to run. The names
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are obtained by using Tcl's glob command. Any directory that contains only
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directories does not need the <tt>dg.exp</tt> file.</p>
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<p>The <tt>llvm-runtests</tt> function lookas at each file that is passed to
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it and gathers any lines together that match "RUN:". This are the "RUN" lines
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that specify how the test is to be run. So, each test script must contain
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RUN lines if it is to do anything. If there are no RUN lines, the
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<tt>llvm-runtests</tt> function will issue an error and the test will
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fail.</p>
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<p>RUN lines are specified in the comments of the test program using the
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keyword <tt>RUN</tt> followed by a colon, and lastly the command (pipeline)
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to execute. Together, these lines form the "script" that
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<tt>llvm-runtests</tt> executes to run the test case. The syntax of the
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RUN lines is similar to a shell's syntax for pipelines including I/O
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redirection and variable substitution. However, even though these lines
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may <i>look</i> like a shell script, they are not. RUN lines are interpreted
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directly by the Tcl <tt>exec</tt> command. They are never executed by a
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shell. Consequently the syntax differs from normal shell script syntax in a
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few ways. You can specify as many RUN lines as needed.</p>
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<p>Each RUN line is executed on its own, distinct from other lines unless
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its last character is <tt>\</tt>. This continuation character causes the RUN
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line to be concatenated with the next one. In this way you can build up long
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pipelines of commands without making huge line lengths. The lines ending in
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<tt>\</tt> are concatenated until a RUN line that doesn't end in <tt>\</tt> is
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found. This concatenated set of RUN lines then constitutes one execution.
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Tcl will substitute variables and arrange for the pipeline to be executed. If
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any process in the pipeline fails, the entire line (and test case) fails too.
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</p>
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<p> Below is an example of legal RUN lines in a <tt>.ll</tt> file:</p>
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<div class="doc_code">
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<pre>
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; RUN: llvm-as < %s | llvm-dis > %t1
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; RUN: llvm-dis < %s.bc-13 > %t2
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; RUN: diff %t1 %t2
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</pre>
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</div>
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<p>As with a Unix shell, the RUN: lines permit pipelines and I/O redirection
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to be used. However, the usage is slightly different than for Bash. To check
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what's legal, see the documentation for the
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<a href="http://www.tcl.tk/man/tcl8.5/TclCmd/exec.htm#M2">Tcl exec</a>
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command and the
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<a href="http://www.tcl.tk/man/tcl8.5/tutorial/Tcl26.html">tutorial</a>.
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The major differences are:</p>
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<ul>
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<li>You can't do <tt>2>&1</tt>. That will cause Tcl to write to a
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file named <tt>&1</tt>. Usually this is done to get stderr to go through
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a pipe. You can do that in tcl with <tt>|&</tt> so replace this idiom:
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<tt>... 2>&1 | grep</tt> with <tt>... |& grep</tt></li>
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<li>You can only redirect to a file, not to another descriptor and not from
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a here document.</li>
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<li>tcl supports redirecting to open files with the @ syntax but you
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shouldn't use that here.</li>
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</ul>
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<p>There are some quoting rules that you must pay attention to when writing
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your RUN lines. In general nothing needs to be quoted. Tcl won't strip off any
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' or " so they will get passed to the invoked program. For example:</p>
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|
|
|
<div class="doc_code">
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|
<pre>
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... | grep 'find this string'
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</pre>
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|
</div>
|
|
|
|
<p>This will fail because the ' characters are passed to grep. This would
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instruction grep to look for <tt>'find</tt> in the files <tt>this</tt> and
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<tt>string'</tt>. To avoid this use curly braces to tell Tcl that it should
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treat everything enclosed as one value. So our example would become:</p>
|
|
|
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<div class="doc_code">
|
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<pre>
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... | grep {find this string}
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</pre>
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</div>
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<p>Additionally, the characters <tt>[</tt> and <tt>]</tt> are treated
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specially by Tcl. They tell Tcl to interpret the content as a command to
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execute. Since these characters are often used in regular expressions this can
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have disastrous results and cause the entire test run in a directory to fail.
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For example, a common idiom is to look for some basicblock number:</p>
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<div class="doc_code">
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<pre>
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... | grep bb[2-8]
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</pre>
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</div>
|
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<p>This, however, will cause Tcl to fail because its going to try to execute
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a program named "2-8". Instead, what you want is this:</p>
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<div class="doc_code">
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<pre>
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... | grep {bb\[2-8\]}
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</pre>
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</div>
|
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<p>Finally, if you need to pass the <tt>\</tt> character down to a program,
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then it must be doubled. This is another Tcl special character. So, suppose
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|
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>
|
|
|
|
</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>prcontext</b> (%prcontext)</dt>
|
|
<dd>Path to the prcontext tcl script that prints some context around a
|
|
line that matches a pattern. This isn't strictly necessary as the test suite
|
|
is run with its PATH altered to include the test/Scripts directory where
|
|
the prcontext script is located. Note that this script is similar to
|
|
<tt>grep -C</tt> but you should use the <tt>prcontext</tt> script because
|
|
not all platforms support <tt>grep -C</tt>.</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>llvmgcc_version</b> (%llvmgcc_version)</dt>
|
|
<dd>The full version number of the <tt>llvm-gcc</tt> executable.</dd>
|
|
|
|
<dt><b>llvmgccmajvers</b> (%llvmgccmajvers)</dt>
|
|
<dd>The major version number of the <tt>llvm-gcc</tt> executable.</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 or llvmgcc version number 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>. When matching
|
|
the llvm-gcc version, you can specify the major (e.g. 3) or full version
|
|
(i.e. 3.4) number. Here is an example of an <tt>XFAIL</tt> line:</p>
|
|
|
|
<div class="doc_code">
|
|
<pre>
|
|
; XFAIL: darwin,sun,llvmgcc4
|
|
</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 <program> 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</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/llvm-test</tt></p>
|
|
|
|
<li><p>Configure the test suite using llvm configure. This will automatically
|
|
configure test-suite. You must do it from the top level otherwise llvm-gcc
|
|
will not be set which is required to run llvm-test:</p>
|
|
<div class="doc_code">
|
|
<pre>
|
|
% cd $LLVM_OBJ_ROOT ; $LLVM_SRC_ROOT/configure --with-llvmgccdir=$LLVM_GCC_DIR
|
|
</pre>
|
|
</div>
|
|
<p>Note that 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>Change back to the <tt>llvm/projects/test-suite</tt> directory you created before
|
|
and run <tt>gmake</tt> (or just "<tt>make</tt>" on systems where GNU make is
|
|
the default, such as linux.</p></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 class="doc_subsection">
|
|
<a name="testsuiteexternal">Configuring external tests</a></div>
|
|
<!-- _______________________________________________________________________ -->
|
|
|
|
<div class="doc_text">
|
|
<p>Note, when configuring the <tt>test-suite</tt> module, you might want to
|
|
specify the following configuration options:</p>
|
|
<dl>
|
|
<dt><i>--enable-spec2000</i>
|
|
<dt><i>--enable-spec2000=<<tt>directory</tt>></i>
|
|
<dd>
|
|
Enable the use of SPEC2000 when testing LLVM. This is disabled by default
|
|
(unless <tt>configure</tt> finds SPEC2000 installed). By specifying
|
|
<tt>directory</tt>, you can tell configure where to find the SPEC2000
|
|
benchmarks. If <tt>directory</tt> is left unspecified, <tt>configure</tt>
|
|
uses the default value
|
|
<tt>/home/vadve/shared/benchmarks/speccpu2000/benchspec</tt>.
|
|
<p>
|
|
|
|
<dt><i>--enable-spec95</i>
|
|
<dt><i>--enable-spec95=<<tt>directory</tt>></i>
|
|
<dd>
|
|
Enable the use of SPEC95 when testing LLVM. It is similar to the
|
|
<i>--enable-spec2000</i> option.
|
|
<p>
|
|
|
|
<dt><i>--enable-povray</i>
|
|
<dt><i>--enable-povray=<<tt>directory</tt>></i>
|
|
<dd>
|
|
Enable the use of Povray as an external test. Versions of Povray written
|
|
in C should work. This option is similar to the <i>--enable-spec2000</i>
|
|
option.
|
|
</dl>
|
|
</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.<value of TEST variable>.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.<type>.format</tt> file (when running with
|
|
<tt>TEST=<type></tt>).
|
|
|
|
The <tt>report</tt> also generate a file called
|
|
<tt>report.<type>.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 > output.log 2>&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
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src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
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<a href="http://validator.w3.org/check/referer"><img
|
|
src="http://www.w3.org/Icons/valid-html401" 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>
|
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</body>
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</html>
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