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507 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 Test Suite 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 Test Suite 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="#quick">Quick Start</a></li>
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<li><a href="#org">LLVM Test Suite Organization</a>
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<ul>
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<li><a href="#codefragments">Code Fragments</a></li>
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<li><a href="#wholeprograms">Whole Programs</a></li>
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</ul></li>
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<li><a href="#tree">LLVM Test Suite Tree</a></li>
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<li><a href="#qmstructure">QMTest Structure</a></li>
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<li><a href="#progstructure"><tt>llvm-test</tt> Structure</a></li>
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<li><a href="#run">Running the LLVM Tests</a></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 and <a
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href="http://llvm.x10sys.com/rspencer">Reid Spencer</a></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 test suite. It documents
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the structure of the LLVM test suite, the tools needed to use it, and how to add
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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 test suite, 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.qmtest.com">QMTest</A></dt>
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<dd>The LLVM test suite uses QMTest to organize and run tests. <b>Note:
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you will need <a href="http://llvm.cs.uiuc.edu/qm-2.0.3.tar.gz">QMTest
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2.0.3 (source tar.gz file)</a> to be successful. The tests do not run with
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any other version.</b></dd>
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<dt><a href="http://www.python.org">Python</A></dt>
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<dd>You will need a Python interpreter that works with QMTest. Python will
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need zlib and SAX support enabled.</dd>
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</dl>
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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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</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 CVS modules. The basic feature and
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regression tests are in the main "llvm" module under the directory
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<tt>llvm/test</tt>. A more comprehensive test suite that includes whole
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programs in C and C++ is in the <tt>llvm-test</tt> module. This module should
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be checked out to the <tt>llvm/projects</tt> directory. When you
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<tt>configure</tt> the <tt>llvm</tt> module, the <tt>llvm-test</tt> module
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will be automatically configured. Or you can do it manually.</p>
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<p>To run all of the simple tests in LLVM, use the master Makefile in the
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<tt>llvm/test</tt> directory:</p>
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<pre>
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% gmake -C llvm/test
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</pre>
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<p>To run only the code fragment tests (i.e. those that do basic testing of
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LLVM), run the tests organized by QMTest:</p>
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<pre>
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% gmake -C llvm/test qmtest
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</pre>
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<p>To run only the basic feature tests, QMTest supports the following
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target:</p>
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<pre>
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% gmake -C llvm/test Feature.t
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</pre>
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<p>To run only the regression tests, QMTest supports the following
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target:</p>
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<pre>
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% gmake -C llvm/test Regression.t
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</pre>
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<p>To run the comprehensive test suite (tests that compile and execute whole
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programs), run the <tt>llvm-test</tt> tests:</p>
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<pre>
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% cd llvm/projects
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% cvs co llvm-test
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% cd llvm-test
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% ./configure --with-llvmsrc=$LLVM_SRC_ROOT --with-llvmobj=$LLVM_OBJ_ROOT
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% gmake
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</pre>
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</div>
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<!--=========================================================================-->
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<div class="doc_section"><a name="org">LLVM Test Suite Organization</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>The LLVM test suite contains two major categories of tests: code
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fragments and whole programs. Code fragments are in the <tt>llvm</tt> module
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under the directory under the <tt>llvm/test</tt> directory. The whole programs
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test suite are n the <tt>llvm-test</tt> module under the main directory.</p>
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</div>
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<div class="doc_subsection"><a name="codefragments">Code Fragments</a>
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</div>
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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.</p>
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<p>Code fragments are not complete programs, and they are never executed to
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determine correct behavior.</p>
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<p>Thes code fragment tests are located in the <tt>llvm/test/Features</tt> and
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<tt>llvm/test/Regression</tt> directories.</p>
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</div>
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<div class="doc_subsection"><a name="wholeprograms">Whole Programs</a></div>
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<div class="doc_text">
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<p>Whole Programs are pieces of code which can be compiled and linked into a
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stand-alone program that can be executed. These programs are generally written
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in high level languages such as C or C++, but sometimes they are written
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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>All "whole program" tests are located in the <tt>llvm-test</tt> CVS
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module.</p>
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</div>
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<!--=========================================================================-->
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<div class="doc_section"><a name="tree">LLVM Test Suite Tree</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>Each type of test in the LLVM test suite has its own directory. The major
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subtrees of the test suite directory tree are as follows:</p>
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<ul>
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<li><tt>llvm/test/Features</tt>
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<p>This directory contains sample codes that test various features of the
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LLVM language. These pieces of sample code are run through various
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assembler, disassembler, and optimizer passes.</p>
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</li>
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<li><tt>llvm/test/Regression</tt>
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<p>This directory contains regression tests for LLVM. When a bug is found
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in LLVM, a regression test containing just enough code to reproduce the
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problem should be written and placed somewhere underneath this directory.
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In most cases, this will be a small piece of LLVM assembly language code,
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often distilled from an actual application or benchmark.</p>
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</li>
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<li><tt>llvm-test</tt>
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<p>The <tt>llvm-test</tt> CVS module contains 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>In addition for testing correctness, the <tt>llvm-test</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></li>
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<li><tt>llvm-test/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>llvm-test/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>llvm-test/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 presence and
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location of these external programs is configured by the llvm-test
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<tt>configure</tt> script.</p></li>
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<li><tt>llvm/test/QMTest</tt>
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<p>This directory contains the QMTest information files. Inside this directory
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are QMTest administration files and the Python code that implements the LLVM
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test and database classes.</p></li>
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</ul>
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</div>
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<!--=========================================================================-->
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<div class="doc_section"><a name="qmstructure">QMTest Structure</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>The LLVM test suite is partially driven by QMTest and partially driven by GNU
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Make. Specifically, the Features and Regression tests are all driven by QMTest.
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The <tt>llvm-test</tt> module is currently driven by a set of Makefiles.</p>
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<p>The QMTest system needs to have several pieces of information available;
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these pieces of configuration information are known collectively as the
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"context" in QMTest parlance. Since the context for LLVM is relatively large,
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the master Makefile in llvm/test sets it for you.</p>
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<p>The LLVM database class makes the subdirectories of llvm/test a QMTest test
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database. For each directory that contains tests driven by QMTest, it knows
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what type of test the source file is and how to run it.</p>
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<p>Hence, the QMTest namespace is essentially what you see in the Feature and
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Regression directories, but there is some magic that the database class performs
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(as described below).</p>
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<p>The QMTest namespace is currently composed of the following tests and test
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suites:</p>
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<ul>
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<li>Feature
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<p>These are the feature tests found in the Feature directory.
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They are broken up into the following categories:</p>
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<ul>
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<li>ad
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<p>Assembler/Disassembler tests. These tests verify that a piece of LLVM
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assembly language can be assembled into bytecode and then disassembled
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into the original assembly language code. It does this several times to
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ensure that assembled output can be disassembled and disassembler output
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can be assembled. It also verifies that the give assembly language file
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can be assembled correctly.</p></li>
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<li>opt
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<p>Optimizer tests. These tests verify that two of the optimizer passes
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completely optimize a program (i.e. after a single pass, they cannot
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optimize a program any further).</p></li>
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<li>mc
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<p> Machine code tests. These tests verify that the LLVM assembly
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language file can be translated into native assembly code.</p></li>
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<li>cc
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<p>C code tests. These tests verify that the specified LLVM assembly
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code can be converted into C source code using the C backend.</p></li>
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</ul>
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<p>The LLVM database class looks at every file in the Feature directory and
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creates a fake test hierarchy containing
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<tt>Feature.<testtype>.<testname></tt>. So, if you add an LLVM
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assembly language file to the Feature directory, it actually creates 5 new
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tests: assembler/disassembler, assembler, optimizer, machine code, and C code.
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</p></li>
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<li>Regression
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<p>These are the regression tests. There is one suite for each
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subdirectory of the Regression directory. If you add a new subdirectory
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there, you will need to modify, at least, the <tt>RegressionMap</tt>
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variable in <tt>QMTest/llvmdb.py</tt> so that QMTest knows how to run the
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tests in the new subdirectory.</p>
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</li>
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</ul>
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</div>
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<!--=========================================================================-->
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<div class="doc_section"><a name="progstructure"><tt>llvm-test</tt>
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Structure</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>As mentioned previously, the <tt>llvm-test</tt> module provides three types
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of tests: MultiSource, SingleSource, and External. Each tree is then subdivided
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into several categories, including applications, benchmarks, regression tests,
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code that is strange grammatically, etc. These organizations should be
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relatively self explanatory.</p>
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<p>In addition to the regular "whole program" tests, the <tt>llvm-test</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 gmake 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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<div class="doc_section"><a name="run">Running the LLVM Tests</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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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>The master Makefile in llvm/test is capable of running only the QMTest driven
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tests. By default, it will run all of these tests.</p>
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<p>To run only the QMTest driven tests, run <tt>gmake qmtest</tt> at the
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command line in llvm/tests. To run a specific qmtest, suffix the test name with
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".t" when running gmake.</p>
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<p>For example, to run the Regression.LLC tests, type
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<tt>gmake Regression.LLC.t</tt> in <tt>llvm/tests</tt>.</p>
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<p>Note that there are no Makefiles in <tt>llvm/test/Features</tt> and
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<tt>llvm/test/Regression</tt>. You must use QMTest from the <tt>llvm/test</tt>
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directory to run them.</p>
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<p>To run the <tt>llvm-test</tt> suite, you need to use the following steps:
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</p>
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<ol>
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<li>cd into the llvm/projects directory</li>
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<li>check out the <tt>llvm-test</tt> module with:<br/>
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<tt>cvs -d :pserver:anon@llvm.cs.uiuc.edu:/var/cvs/llvm co -PR llvm-test</tt><br>
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This will get the test suite into <tt>llvm/projects/llvm-test</tt></li>
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<li>configure the test suite. You can do this one of two ways:
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<ol>
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<li>Use the regular llvm configure:<br/>
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<tt>cd $LLVM_OBJ_ROOT ; $LLVM_SRC_ROOT/configure</tt><br/>
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This will ensure that the <tt>projects/llvm-test</tt> directory is also
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properly configured.</li>
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<li>Use the <tt>configure</tt> script found in the <tt>llvm-test</tt> source
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directory:<br/>
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<tt>$BUILD_SRC_DIR/configure --with-llvmsrc=$LLVM_SRC_ROOT --with-llvmobj=$LLVM_OBJ_ROOT</tt>
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</li>
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</ol>
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<li>gmake</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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<p>To make a specialized test (use one of the
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<tt>llvm-test/TEST.<type>.Makefile</tt>s), just run:<br/>
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<tt>gmake TEST=<type> test</tt><br/>For example, you could run the
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nightly tester tests using the following commands:</p>
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<pre>
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% cd llvm/projects/llvm-test
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% gmake TEST=nightly test
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</pre>
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<p>Regardless of which test you're running, the results are printed on standard
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output and standard error. You can redirect these results to a file if you
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choose.</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 QMTest,
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the result for such tests will be XFAIL (eXpected FAILure). In this way, you
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can tell the difference between an expected and unexpected failure.</p>
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<p>The tests in <tt>llvm-test</tt> have no such feature as of 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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<div class="doc_section"><a name="nightly">Running the nightly tester</a></div>
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|
<!--=========================================================================-->
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<div class="doc_text">
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<p>
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The <a href="http://llvm.cs.uiuc.edu/testresults/">LLVM Nightly Testers</a>
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automatically check out an LLVM tree, build it, run the "nightly"
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program test (described above), run all of the feature and regression tests,
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and then delete the checked out tree. This tester is designed to ensure that
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programs don't break as well as keep track of LLVM's progress over time.</p>
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<p>
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If you'd like to set up an instance of the nightly tester to run on your
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machine, take a look at the comments at the top of the utils/NightlyTester.pl
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file. We usually run it from a crontab entry that looks ilke this:
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</p>
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<pre>
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5 3 * * * LLVM_LIB_SEARCH_PATH=.../llvm-gcc/bytecode-libs $HOME/llvm/utils/NightlyTest.pl -parallel -enable-linscan ...CVSREPOSTRING... $HOME/buildtest-X86 $HOME/cvs/testresults-X86
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</pre>
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<p>Or, you can create a shell script to encapsulate the running of the script.
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The optimized x86 Linux nightly test is run from just such a script:
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<pre>
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#!/bin/bash
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BASE=/proj/work/llvm/nightlytest
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export CVSROOT=:pserver:anon@llvm.cs.uiuc.edu:/var/cvs/llvm
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export BUILDDIR=$BASE/build
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export WEBDIR=$BASE/testresults
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export LLVMGCCDIR=/proj/work/llvm/cfrontend/install
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export PATH=/proj/install/bin:$LLVMGCCDIR/bin:$PATH
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export LD_LIBRARY_PATH=/proj/install/lib
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export LLVM_LIB_SEARCH_PATH=/proj/work/llvm/cfrontend/install/bytecode-libs
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cd $BASE
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cp /proj/work/llvm/llvm/utils/NightlyTest.pl .
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nice ./NightlyTest.pl -nice -release -verbose -parallel -enable-linscan -noexternals
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</pre>
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<p>
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Take a look at the NightlyTest.pl file to see what all of the flags and
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strings do. If you start running the nightly tests, please let us know and
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we'll link your page to the global tester page. Thanks!
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</p>
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</div>
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John T. Criswell<br>
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<a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br/>
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Last modified: $Date$
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</address>
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