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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<link rel="stylesheet" href="llvm.css" type="text/css" media="screen" />
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<title>LLVM Test Suite Guide</title>
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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></li>
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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><a href="#tree">LLVM Test Suite Tree</a></li>
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<li><a href="#qmstructure">QMTest Structure</a></li>
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<li><a href="#progstructure">Programs Structure</a></li>
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<li><a href="#run">Running the LLVM Tests</a></li>
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<p><b>Written by John T. Criswell</b></p>
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</ol>
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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>
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This document is the reference manual for the LLVM test suite. It
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documents the structure of the LLVM test suite, the tools needed to
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use it, and how to add and run tests.
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</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>
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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:
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</p>
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<dl compact>
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<dt><A HREF="http://www.qmtest.com">QMTest</A></dt>
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<dd>The LLVM test suite uses QMTest to organize and
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run tests.</dd>
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<dt><A HREF="http://www.python.org">Python</A></dt>
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<dd>You will need a Python interpreter that works with
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QMTest. Python will need zlib and SAX support
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enabled.</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>
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The tests are located in the LLVM source tree under the directory
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<tt>llvm/test</tt>. To run all of the tests in LLVM, use the Master
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Makefile in that directory:
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</p>
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<pre>
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% gmake -C llvm/test
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</pre>
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<p>
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To run only the code fragment tests (i.e. those that do basic testing of
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LLVM), run the tests organized by QMTest:
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</p>
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<pre>
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% gmake -C llvm/test qmtest
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</pre>
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<p>
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To run only the tests that compile and execute whole programs, run the
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Programs tests:
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</p>
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<pre>
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% gmake -C llvm/test/Programs
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</pre>
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</div>
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<!--===============================================================-->
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<div class="doc_section"><h2><a name="org">LLVM Test Suite
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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.</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>
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Code fragments are small pieces of code that test a specific
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feature of LLVM or trigger a specific bug in LLVM. They are
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usually written in LLVM assembly language, but can be
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written in other languages if the test targets a
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particular language front end.
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</p><p>
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Code fragments are not complete programs, and they are
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never executed to determine correct behavior.
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</p><p>
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The tests in the Features and
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Regression directories contain code fragments.
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</p>
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</div>
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<div class="doc_subsection"><a name="wholeprograms">Whole Programs</a>
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</div>
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<div class="doc_text">
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<p>
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Whole Programs are pieces of code which can be compiled and
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linked into a stand-alone program that can be executed. These
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programs are generally written in high level languages such as C
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or C++, but sometimes they are written straight in LLVM
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assembly.
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</p><p>
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These programs are compiled and then executed using several
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different methods (native compiler, LLVM C backend, LLVM JIT,
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LLVM native code generation, etc). The output of these programs
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is compared to ensure that LLVM is compiling the program
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correctly.
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</p><p>
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In addition to compiling and executing programs, whole program
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tests serve as a way of benchmarking LLVM performance, both in
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terms of the efficiency of the programs generated as well as the
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speed with which LLVM compiles, optimizes, and generates code.
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</p><p>
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The Programs directory contains all tests which compile and
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benchmark whole programs.
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</p>
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</div>
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<!--===============================================================-->
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<div class="doc_section"><h2><a name="tree">LLVM Test Suite Tree</a>
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</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
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major subtrees of the test suite directory tree are as follows:</p>
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<ul>
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<li>Features
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<p>
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This directory contains sample codes that test various features
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of the LLVM language. These pieces of sample code are run
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through various assembler, disassembler, and optimizer passes.
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</p>
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<li>Regression
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<p>
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This directory contains regression tests for LLVM. When a bug
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is found in LLVM, a regression test containing just enough
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code to reproduce the problem should be written and placed
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somewhere underneath this directory. In most cases, this
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will be a small piece of LLVM assembly language code, often
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distilled from an actual application or benchmark.
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</p>
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<li>Programs
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<p>
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The Programs directory contains programs that can be compiled
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with LLVM and executed. These programs are compiled using the
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native compiler and various LLVM backends. The output from the
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program compiled with the native compiler is assumed correct;
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the results from the other programs are compared to the native
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program output and pass if they match.
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</p><p>
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In addition for testing correctness, the Programs directory
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also performs timing tests of various LLVM optimizations.
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It also records compilation times for the compilers and the
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JIT. This information can be used to compare the
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effectiveness of LLVM's optimizations and code generation.
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</p><p>
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The Programs directory is subdivided into several smaller
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subdirectories:
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</p>
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<ul>
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<li>Programs/SingleSource
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<p>
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The SingleSource directory contains test programs that
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are only a single source file in size. These are
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usually small benchmark programs or small programs that
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calculate a particular value. Several such programs are
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grouped together in each directory.
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</p>
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<li>Programs/MultiSource
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<p>
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The MultiSource directory contains subdirectories which
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contain entire programs with multiple source files.
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Large benchmarks and whole applications go here.
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</p>
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<li>Programs/External
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<p>
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The External directory contains Makefiles for building
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code that is external to (i.e. not distributed with)
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LLVM. The most prominent member of this directory is
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the SPEC 2000 benchmark suite. The presence and
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location of these external programs is configured by the
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LLVM <tt>configure</tt> script.
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</p>
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</ul>
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<p>
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<li>QMTest
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<p>
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This directory contains the QMTest information files. Inside
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this directory are QMTest administration files and the Python
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code that implements the LLVM test and database classes.
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</p>
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</ul>
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</div>
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<!--===============================================================-->
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<div class="doc_section"><h2><a name="qmstructure">QMTest Structure</a>
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</div>
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<!--===============================================================-->
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<div class="doc_text">
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<p>
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The LLVM test suite is partially driven by QMTest and partially
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driven by GNU Make. Specifically, the Features and Regression tests
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are all driven by QMTest. The Programs directory is currently
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driven by a set of Makefiles.
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</p><p>
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The QMTest system needs to have several pieces of information
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available; these pieces of configuration information are known
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collectively as the "context" in QMTest parlance. Since the context
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for LLVM is relatively large, the master Makefile in llvm/test
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sets it for you.
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</p><p>
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The LLVM database class makes the subdirectories of llvm/test a
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QMTest test database. For each directory that contains tests driven by
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QMTest, it knows what type of test the source file is and how to run it.
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</p><p>
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Hence, the QMTest namespace is essentially what you see in the
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Feature and Regression directories, but there is some magic that
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the database class performs (as described below).
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</p><p>
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The QMTest namespace is currently composed of the following tests and
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test suites:
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</p>
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<ul>
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<li>Feature
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<p>
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These are the feature tests found in the Feature directory.
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They are broken up into the following categories:
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</p>
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<ul>
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<li>ad
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<p>
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Assembler/Disassembler tests. These tests verify that a
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piece of LLVM assembly language can be assembled into
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bytecode and then disassembled into the original
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assembly language code. It does this several times to
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ensure that assembled output can be disassembled and
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disassembler output can be assembled. It also verifies
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that the give assembly language file can be assembled
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correctly.
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</p>
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<li>opt
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<p>
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Optimizer tests. These tests verify that two of the
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optimizer passes completely optimize a program (i.e.
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after a single pass, they cannot optimize a program
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any further).
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</p>
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<li>mc
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<p>
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Machine code tests. These tests verify that the LLVM
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assembly language file can be translated into native
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assembly code.
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</p>
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<li>cc
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<p>
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C code tests. These tests verify that the specified
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LLVM assembly code can be converted into C source code
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using the C backend.
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</p>
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</ul>
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<p>
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The LLVM database class looks at every file in the Feature
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directory and creates a fake test hierarchy containing
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<tt>Feature.<testtype>.<testname></tt>. So, if you
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add an LLVM assembly language file to the Feature directory, it
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actually creates 5 new tests: assembler/disassembler, assembler,
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optimizer, machine code, and C code.
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</p>
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<li>Regression
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<p>
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These are the regression tests. There is one suite for each
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subdirectory of the Regression directory. If you add a new
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subdirectory there, you will need to modify, at least, the
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<tt>RegressionMap</tt> variable in <tt>QMTest/llvmdb.py</tt> so
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that QMTest knows how to run the tests in the new subdirectory.
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</p>
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</ul>
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</div>
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<!--===============================================================-->
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<div class="doc_section"><h2><a name="progstructure">Programs
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Structure</a></div>
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<!--===============================================================-->
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<div class="doc_text">
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<p>
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As mentioned previously, the Programs tree in llvm/test provides three
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types of tests: MultiSource, SingleSource, and External. Each tree is
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then subdivided into several categories, including applications,
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benchmarks, regression tests, code that is strange grammatically, etc.
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These organizations should be relatively self explanatory.
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</p><p>
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In addition to the regular Programs tests, the Programs tree also
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provides a mechanism for compiling the programs in different ways. If
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the variable TEST is defined on the gmake command line, the test system
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will include a Makefile named <tt>TEST.<value of TEST
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variable>.Makefile</tt>. This Makefile can modify build rules to
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yield different results.
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</p><p>
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For example, the LLVM nightly tester uses <tt>TEST.nightly.Makefile</tt>
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to create the nightly test reports. To run the nightly tests, run
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<tt>gmake TEST=nightly</tt>.
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</p><p>
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There are several TEST Makefiles available in the tree. Some of them
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are designed for internal LLVM research and will not work outside of the
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LLVM research group. They may still be valuable, however, as a guide to
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writing your own TEST Makefile for any optimization or analysis passes
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that you develop with LLVM.
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</p>
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</div>
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<!--===============================================================-->
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<div class="doc_section"><h2><a name="run">Running the LLVM Tests</a>
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</div>
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<!--===============================================================-->
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<div class="doc_text">
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<p>
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First, all tests are executed within the LLVM object directory tree.
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They <i>are not</i> executed inside of the LLVM source tree. This is
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because the test suite creates temporary files during execution.
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</p><p>
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The master Makefile in llvm/test is capable of running both the
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QMTest driven tests and the Programs tests. By default, it will run
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all of the tests.
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</p><p>
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To run only the QMTest driven tests, run <tt>gmake qmtest</tt> at the
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command line in llvm/tests. To run a specific qmtest, suffix the test
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name with ".t" when running gmake.
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</p><p>
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For example, to run the Regression.LLC tests, type
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<tt>gmake Regression.LLC.t</tt> in llvm/tests.
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</p><p>
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Note that the Makefiles in llvm/test/Features and llvm/test/Regression
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are gone. You must now use QMTest from the llvm/test directory to run
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them.
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</p><p>
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To run the Programs test, cd into the llvm/test/Programs directory and
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type <tt>gmake</tt>. Alternatively, you can type <tt>gmake
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TEST=<type> test</tt> to run one of the specialized tests in
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llvm/test/Programs/TEST.<type>.Makefile. For example, you could
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run the nightly tester tests using the following commands:
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</p>
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<pre>
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% cd llvm/test/Programs
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% gmake TEST=nightly test
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</pre>
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<p>
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Regardless of which test you're running, the results are printed on
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standard output and standard error. You can redirect these results to a
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file if you choose.
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</p><p>
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Some tests are known to fail. Some are bugs that we have not fixed yet;
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others are features that we haven't added yet (or may never add). In
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QMTest, the result for such tests will be XFAIL (eXpected FAILure). In
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this way, you can tell the difference between an expected and unexpected
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failure.
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</p><p>
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The Programs tests have no such feature as of this time. If the test
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passes, only warnings and other miscellaneous output will be generated.
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If a test fails, a large <program> FAILED message will be
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displayed. This will help you separate benign warnings from actual test
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failures.
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</p>
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</div>
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<!-- *********************************************************************** -->
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<hr><font size="-1">
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<address>John T. Criswell</address>
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Last modified: $Date$
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</font>
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</body>
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</html>
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