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529 lines
22 KiB
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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>
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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></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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</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. Alternatively, you can configure the <tt>llvm-test</tt> module manually.</p>
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<p>To run all of the simple tests in LLVM using DejaGNU, 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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or<br>
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<pre>
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% gmake check
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</pre>
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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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<pre>
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% gmake -C llvm/test TESTSUITE=Regression/Transforms
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</pre>
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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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<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 <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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<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>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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<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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</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
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driven by GNU Make. Specifically, the Features and Regression tests
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are all driven by DejaGNU. The <tt>llvm-test</tt>
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module is currently driven by a set of Makefiles.</p>
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<p>The DejaGNU structure is very simple, but does require some
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information to be set. This information is gathered via <tt>configure</tt> and
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is written to a file, <tt>site.exp</tt> in <tt>llvm/test</tt>. The
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<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. This file is a program written in tcl that calls
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the <tt>llvm-runtests</tt> procedure on each test file. The
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llvm-runtests procedure is defined in
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<tt>llvm/test/lib/llvm-dg.exp</tt>. 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>In order for a test to be run, it must contain information within
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the test file on how to run the test. These are called <tt>RUN</tt>
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lines. Run lines are specified in the comments of the test program
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using the keyword <tt>RUN</tt> followed by a colon, and lastly the
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commands to execute. These commands will be executed in a bash script,
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so any bash syntax is acceptable. You can specify as many RUN lines as
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necessary. Each RUN line translates to one line in the resulting bash
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script. Below is an example of legal RUN lines in a <tt>.ll</tt>
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file:</p>
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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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<p>There are a couple patterns within a <tt>RUN</tt> line that the
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llvm-runtest procedure looks for and replaces with the appropriate
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syntax:</p>
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<dl style="margin-left: 25px">
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<dt>%p</dt>
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<dd>The path to the source directory. This is for locating
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any supporting files that are not generated by the test, but used by
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the test.</dd>
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<dt>%s</dt>
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<dd>The test file.</dd>
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<dt>%t</dt>
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<dd>Temporary filename: testscript.test_filename.tmp, where
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test_filename is the name of the test file. All temporary files are
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placed in the Output directory within the directory the test is
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located.</dd>
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<dt>%prcontext</dt>
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<dd>Path to a script that performs grep -C. Use this since not all
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platforms support grep -C.</dd>
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<dt>%llvmgcc</dt> <dd>Full path to the llvm-gcc executable.</dd>
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<dt>%llvmgxx</dt> <dd>Full path to the llvm-g++ executable.</dd>
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</dl>
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<p>There are also several scripts in the llvm/test/Scripts directory
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that you might find useful when writing <tt>RUN</tt> lines.</p>
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<p>Lastly, you can easily mark a test that is expected to fail on a
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specific platform by using the <tt>XFAIL</tt> keyword. Xfail lines are
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specified in the comments of the test program using <tt>XFAIL</tt>,
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followed by a colon, and one or more regular expressions (separated by
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a comma) that will match against the target triplet for the
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machine. You can use * to match all targets. Here is an example of an
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<tt>XFAIL</tt> line:</p>
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<pre>
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; XFAIL: darwin,sun
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</pre>
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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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<p>Note, when configuring the <tt>llvm-test</tt> module, you might want to
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specify the following configuration options:</p>
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<dl>
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<dt><i>--enable-spec2000</i>
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<dt><i>--enable-spec2000=<<tt>directory</tt>></i>
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<dd>
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Enable the use of SPEC2000 when testing LLVM. This is disabled by default
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(unless <tt>configure</tt> finds SPEC2000 installed). By specifying
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<tt>directory</tt>, you can tell configure where to find the SPEC2000
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benchmarks. If <tt>directory</tt> is left unspecified, <tt>configure</tt>
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uses the default value
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<tt>/home/vadve/shared/benchmarks/speccpu2000/benchspec</tt>.
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<p>
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<dt><i>--enable-spec95</i>
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<dt><i>--enable-spec95=<<tt>directory</tt>></i>
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<dd>
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Enable the use of SPEC95 when testing LLVM. It is similar to the
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<i>--enable-spec2000</i> option.
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<p>
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<dt><i>--enable-povray</i>
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<dt><i>--enable-povray=<<tt>directory</tt>></i>
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<dd>
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Enable the use of Povray as an external test. Versions of Povray written
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in C should work. This option is similar to the <i>--enable-spec2000</i>
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option.
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</dl>
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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 DejaGNU 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 DejaGNU driven tests, run <tt>gmake</tt> at the
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command line in <tt>llvm/test</tt>. To run a specific directory of tests, use
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the TESTSUITE variable.
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</p>
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<p>For example, to run the Regression tests, type
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<tt>gmake TESTSUITE=Regression</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 DejaGNU 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 ; $LLVM_SRC_ROOT/configure</tt><br/>
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This will ensure that the <tt>projects/llvm-test</tt> directory is also
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properly configured.</li>
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<li>Use the <tt>configure</tt> script found in the <tt>llvm-test</tt> source
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directory:<br/>
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<tt>$LLVM_SRC_ROOT/projects/llvm-test/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>
|
|
<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:<br/>
|
|
<tt>gmake TEST=<type> test</tt><br/>For example, you could run the
|
|
nightly tester tests using the following commands:</p>
|
|
|
|
<pre>
|
|
% cd llvm/projects/llvm-test
|
|
% gmake TEST=nightly test
|
|
</pre>
|
|
|
|
<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_section"><a name="nightly">Running the nightly tester</a></div>
|
|
<!--=========================================================================-->
|
|
|
|
<div class="doc_text">
|
|
|
|
<p>
|
|
The <a href="http://llvm.cs.uiuc.edu/testresults/">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,
|
|
and then delete the checked out tree. This tester 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/NightlyTester.pl</tt> file. We usually run it from a crontab entry
|
|
that looks ilke this:</p>
|
|
|
|
<div class="doc_code">
|
|
<pre>
|
|
5 3 * * * $HOME/llvm/utils/NightlyTest.pl -parallel $CVSROOT $HOME/buildtest-X86 $HOME/cvs/testresults-X86
|
|
</pre>
|
|
</div>
|
|
|
|
<p>Or, you can create a shell script to encapsulate the running of the script.
|
|
The optimized x86 Linux nightly test is run from just such a script:</p>
|
|
|
|
<div class="doc_code">
|
|
<pre>
|
|
#!/bin/bash
|
|
BASE=/proj/work/llvm/nightlytest
|
|
export CVSROOT=:pserver:anon@llvm.cs.uiuc.edu:/var/cvs/llvm
|
|
export BUILDDIR=$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/NightlyTest.pl .
|
|
nice ./NightlyTest.pl -nice -release -verbose -parallel -enable-linscan -noexternals 2>&1 > output.log
|
|
mail -s 'X86 nightly tester results' <a href="http://mail.cs.uiuc.edu/mailman/listinfo/llvm-testresults">llvm-testresults@cs.uiuc.edu</a> < output.log
|
|
</pre>
|
|
</div>
|
|
|
|
<p>Take a look at the <tt>NightlyTest.pl</tt> file to see what all of the flags
|
|
and strings do. If you start running the nightly tests, please let us know and
|
|
we'll link your page to the global tester page. Thanks!</p>
|
|
|
|
</div>
|
|
|
|
<!-- *********************************************************************** -->
|
|
|
|
<hr>
|
|
<address>
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src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
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|
|
John T. Criswell, Reid Spencer, and Tanya Lattner<br>
|
|
<a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br/>
|
|
Last modified: $Date$
|
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</address>
|
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