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911 lines
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911 lines
38 KiB
HTML
<!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>
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</li>
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<li><a href="#tree">LLVM Test Suite Tree</a></li>
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<li><a href="#dgstructure">DejaGNU 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>
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<ul>
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<li><a href="#customtest">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 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.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="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 basic feature
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and 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>test-suite</tt> module. This module should
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be checked out to the <tt>llvm/projects</tt> directory as llvm-test (for
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historical purpose). When you <tt>configure</tt> the <tt>llvm</tt> module,
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the <tt>llvm-test</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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<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 llvm/test using DejaGNU (ie.
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Regression/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 -C llvm/test TESTSUITE=Regression/Transforms
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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 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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<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 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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</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 <tt>llvm/test</tt> directory. The whole programs
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test suite is in the <tt>llvm-test</tt> module under the main directory.</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"><a name="codefragments">Code Fragments</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.</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>These 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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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"><a name="wholeprograms">Whole Programs</a></div>
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<!-- _______________________________________________________________________ -->
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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>test-suite</tt> Subversion
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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</tt>
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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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<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></li>
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<li><tt>test-suite</tt>
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<p>The <tt>test-suite</tt> 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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</ul>
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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 test suite is partially driven by DejaGNU and partially driven by
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GNU Make. Specifically, the Features and Regression tests are all driven by
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DejaGNU. The <tt>llvm-test</tt> module is currently driven by a set of
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Makefiles.</p>
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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. It 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 or 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>
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<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:
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<div class="doc_code">
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<pre>
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... | grep 'i32\*'
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</pre>
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</div>
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<p>This will fail to match what you want (a pointer to i32). First, the
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<tt>'</tt> do not get stripped off. Second, the <tt>\</tt> gets stripped off
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by Tcl so what grep sees is: <tt>'i32*'</tt>. That's not likely to match
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anything. To resolve this you must use <tt>\\</tt> and the <tt>{}</tt>, like
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this:</p>
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<div class="doc_code">
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<pre>
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... | grep {i32\\*}
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</pre>
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</div>
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</div>
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<!-- _______________________________________________________________________ -->
|
|
<div class="doc_subsection"><a name="dgvars">Vars 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. 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 numer 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="progstructure"><tt>llvm-test</tt>
|
|
Structure</a></div>
|
|
<!--=========================================================================-->
|
|
|
|
<div class="doc_text">
|
|
|
|
<p>As mentioned previously, the <tt>llvm-test</tt> module provides three types
|
|
of tests: MultiSource, SingleSource, and External. 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>In addition to the regular "whole program" tests, the <tt>llvm-test</tt>
|
|
module also provides a mechanism for compiling the programs in different ways.
|
|
If the variable TEST is defined on the gmake 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>
|
|
|
|
<p>Note, when configuring the <tt>llvm-test</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_section"><a name="run">Running the LLVM Tests</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>The master Makefile in <tt>llvm/test</tt> is capable of running only the
|
|
DejaGNU driven tests. By default, it will run all of these tests.</p>
|
|
|
|
<p>To run only the DejaGNU driven tests, run <tt>gmake</tt> at the
|
|
command line in <tt>llvm/test</tt>. To run a specific directory of tests, use
|
|
the <tt>TESTSUITE</tt> variable.
|
|
</p>
|
|
|
|
<p>For example, to run the Regression tests, type
|
|
<tt>gmake TESTSUITE=Regression</tt> in <tt>llvm/tests</tt>.</p>
|
|
|
|
<p>Note that there are no Makefiles in <tt>llvm/test/Features</tt> and
|
|
<tt>llvm/test/Regression</tt>. You must use DejaGNU from the <tt>llvm/test</tt>
|
|
directory to run them.</p>
|
|
|
|
<p>To run the <tt>llvm-test</tt> 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 llvm-test
|
|
</pre>
|
|
</div>
|
|
|
|
<p>This will get the test suite into <tt>llvm/projects/llvm-test</tt></p>
|
|
|
|
<li><p>Configure the test suite. You can do this one of two ways:</p>
|
|
|
|
<ol>
|
|
<li>Use the regular llvm configure:<br/><br/>
|
|
|
|
<div class="doc_code">
|
|
<pre>
|
|
% cd $LLVM_OBJ_ROOT ; $LLVM_SRC_ROOT/configure
|
|
</pre>
|
|
</div>
|
|
|
|
<p>This will ensure that the <tt>projects/llvm-test</tt> directory is
|
|
also properly configured.</p></li>
|
|
|
|
<li><p>Use the <tt>configure</tt> script found in the <tt>llvm-test</tt>
|
|
source directory:</p>
|
|
|
|
<div class="doc_code">
|
|
<pre>
|
|
% $LLVM_SRC_ROOT/projects/llvm-test/configure \
|
|
--with-llvmsrc=$LLVM_SRC_ROOT \
|
|
--with-llvmobj=$LLVM_OBJ_ROOT
|
|
</pre>
|
|
</div>
|
|
</li>
|
|
</ol>
|
|
<li><tt>gmake</tt></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>
|
|
|
|
<p>To make a specialized test (use one of the
|
|
<tt>llvm-test/TEST.<type>.Makefile</tt>s), just run:</p>
|
|
|
|
<div class="doc_code">
|
|
<pre>
|
|
% gmake TEST=<type> test
|
|
</pre>
|
|
</div>
|
|
|
|
<p>For example, you could run the nightly tester tests using the following
|
|
commands:</p>
|
|
|
|
<div class="doc_code">
|
|
<pre>
|
|
% cd llvm/projects/llvm-test
|
|
% gmake TEST=nightly test
|
|
</pre>
|
|
</div>
|
|
|
|
<p>Regardless of which test you're running, the results are printed on standard
|
|
output and standard error. You can redirect these results to a file if you
|
|
choose.</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 <tt>llvm-test</tt> 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_subsection">
|
|
<a name="customtest">Writing custom tests for llvm-test</a></div>
|
|
<!-- _______________________________________________________________________ -->
|
|
|
|
<div class="doc_text">
|
|
|
|
<p>Assuming you can run llvm-test, (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>llvm-test/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 llvm-test, 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/llvm-test/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 llvm-test/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 feature and regression 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>
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|
|
|
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John T. Criswell, Reid Spencer, and Tanya Lattner<br>
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<a href="http://llvm.org">The LLVM Compiler Infrastructure</a><br/>
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