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|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>LLVM Testing Infrastructure Guide</title>
<link rel="stylesheet" href="llvm.css" type="text/css">
</head>
<body>
<h1>
LLVM Testing Infrastructure Guide
</h1>
<ol>
<li><a href="#overview">Overview</a></li>
<li><a href="#requirements">Requirements</a></li>
<li><a href="#org">LLVM testing infrastructure organization</a>
<ul>
<li><a href="#regressiontests">Regression tests</a></li>
<li><a href="#testsuite"><tt>test-suite</tt></a></li>
<li><a href="#debuginfotests">Debugging Information tests</a></li>
</ul>
</li>
<li><a href="#quick">Quick start</a>
<ul>
<li><a href="#quickregressiontests">Regression tests</a></li>
<li><a href="#quickdebuginfotests">Debugging Information tests</a></li>
</ul>
</li>
<li><a href="#rtstructure">Regression test structure</a>
<ul>
<li><a href="#rtcustom">Writing new regression tests</a></li>
<li><a href="#FileCheck">The FileCheck utility</a></li>
<li><a href="#rtvars">Variables and substitutions</a></li>
<li><a href="#rtfeatures">Other features</a></li>
</ul>
</li>
<li><a href="#testsuiteoverview"><tt>test-suite</tt> Overview</a>
<ul>
<li><a href="#testsuitequickstart"><tt>test-suite</tt> Quickstart</a></li>
<li><a href="#testsuitemakefiles"><tt>test-suite</tt> Makefiles</a></li>
</ul>
</li>
</ol>
<div class="doc_author">
<p>Written by John T. Criswell, Daniel Dunbar, Reid Spencer, and Tanya Lattner</p>
</div>
<!--=========================================================================-->
<h2><a name="overview">Overview</a></h2>
<!--=========================================================================-->
<div>
<p>This document is the reference manual for the LLVM testing infrastructure. It
documents the structure of the LLVM testing infrastructure, the tools needed to
use it, and how to add and run tests.</p>
</div>
<!--=========================================================================-->
<h2><a name="requirements">Requirements</a></h2>
<!--=========================================================================-->
<div>
<p>In order to use the LLVM testing infrastructure, you will need all of the
software required to build LLVM, as well
as <a href="http://python.org">Python</a> 2.4 or later.</p>
</div>
<!--=========================================================================-->
<h2><a name="org">LLVM testing infrastructure organization</a></h2>
<!--=========================================================================-->
<div>
<p>The LLVM testing infrastructure contains two major categories of tests:
regression tests and whole programs. The regression tests are contained inside
the LLVM repository itself under <tt>llvm/test</tt> and are expected to always
pass -- they should be run before every commit.</p>
<p>The whole programs tests are referred to as the "LLVM test suite" (or
"test-suite") and are in the <tt>test-suite</tt> module in subversion. For
historical reasons, these tests are also referred to as the "nightly tests" in
places, which is less ambiguous than "test-suite" and remains in use although we
run them much more often than nightly.</p>
<!-- _______________________________________________________________________ -->
<h3><a name="regressiontests">Regression tests</a></h3>
<!-- _______________________________________________________________________ -->
<div>
<p>The regression tests are small pieces of code that test a specific feature of
LLVM or trigger a specific bug in LLVM. They are usually written in LLVM
assembly language, but can be written in other languages if the test targets a
particular language front end (and the appropriate <tt>--with-llvmgcc</tt>
options were used at <tt>configure</tt> time of the <tt>llvm</tt> module). These
tests are driven by the 'lit' testing tool, which is part of LLVM.</p>
<p>These code fragments are not complete programs. The code generated
from them is never executed to determine correct behavior.</p>
<p>These code fragment tests are located in the <tt>llvm/test</tt>
directory.</p>
<p>Typically when a bug is found in LLVM, a regression test containing
just enough code to reproduce the problem should be written and placed
somewhere underneath this directory. In most cases, this will be a small
piece of LLVM assembly language code, often distilled from an actual
application or benchmark.</p>
</div>
<!-- _______________________________________________________________________ -->
<h3><a name="testsuite"><tt>test-suite</tt></a></h3>
<!-- _______________________________________________________________________ -->
<div>
<p>The test suite contains whole programs, which are pieces of code which can be
compiled and linked into a stand-alone program that can be executed. These
programs are generally written in high level languages such as C or C++.</p>
<p>These programs are compiled using a user specified compiler and set of flags,
and then executed to capture the program output and timing information. The
output of these programs is compared to a reference output to ensure that the
program is being compiled correctly.</p>
<p>In addition to compiling and executing programs, whole program tests serve as
a way of benchmarking LLVM performance, both in terms of the efficiency of the
programs generated as well as the speed with which LLVM compiles, optimizes, and
generates code.</p>
<p>The test-suite is located in the <tt>test-suite</tt> Subversion module.</p>
</div>
<!-- _______________________________________________________________________ -->
<h3><a name="debuginfotests">Debugging Information tests</a></h3>
<!-- _______________________________________________________________________ -->
<div>
<p>The test suite contains tests to check quality of debugging information.
The test are written in C based languages or in LLVM assembly language. </p>
<p>These tests are compiled and run under a debugger. The debugger output
is checked to validate of debugging information. See README.txt in the
test suite for more information . This test suite is located in the
<tt>debuginfo-tests</tt> Subversion module. </p>
</div>
</div>
<!--=========================================================================-->
<h2><a name="quick">Quick start</a></h2>
<!--=========================================================================-->
<div>
<p>The tests are located in two separate Subversion modules. The regressions
tests are in the main "llvm" module under the directory
<tt>llvm/test</tt> (so you get these tests for free with the main llvm
tree). Use "make check-all" to run the regression tests after building
LLVM.</p>
<p>The more comprehensive test suite that includes whole programs in C and C++
is in the <tt>test-suite</tt>
module. See <a href="#testsuitequickstart"><tt>test-suite</tt> Quickstart</a>
for more information on running these tests.</p>
<!-- _______________________________________________________________________ -->
<h3><a name="quickregressiontests">Regression tests</a></h3>
<div>
<!-- _______________________________________________________________________ -->
<p>To run all of the LLVM regression tests, use master Makefile in
the <tt>llvm/test</tt> directory:</p>
<div class="doc_code">
<pre>
% gmake -C llvm/test
</pre>
</div>
<p>or</p>
<div class="doc_code">
<pre>
% gmake check
</pre>
</div>
<
|
