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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></h2></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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2003-10-10 20:42:49 +02:00
|
|
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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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2003-10-23 20:10:28 +02:00
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</p>
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2003-10-10 20:42:49 +02:00
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2003-10-23 20:10:28 +02:00
|
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|
<li>mc
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2003-10-10 20:42:49 +02:00
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<p>
|
2003-10-23 20:10:28 +02:00
|
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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>
|
2003-10-10 20:42:49 +02:00
|
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|
2003-10-23 20:10:28 +02:00
|
|
|
<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>
|
2003-10-10 20:42:49 +02:00
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
<p>
|
2003-10-23 20:10:28 +02:00
|
|
|
The LLVM database class looks at every file in the Feature
|
|
|
|
|
directory and creates a fake test hierarchy containing
|
|
|
|
|
<tt>Feature.<testtype>.<testname></tt>. So, if you
|
|
|
|
|
add an LLVM assembly language file to the Feature directory, it
|
|
|
|
|
actually creates 5 new tests: assembler/disassembler, assembler,
|
2003-10-10 20:42:49 +02:00
|
|
|
optimizer, machine code, and C code.
|
2003-10-23 20:10:28 +02:00
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
<li>Regression
|
|
|
|
|
<p>
|
|
|
|
|
These are the regression tests. There is one suite for each
|
|
|
|
|
subdirectory of the Regression directory. If you add a new
|
|
|
|
|
subdirectory there, you will need to modify, at least, the
|
|
|
|
|
<tt>RegressionMap</tt> variable in <tt>QMTest/llvmdb.py</tt> so
|
|
|
|
|
that QMTest knows how to run the tests in the new subdirectory.
|
|
|
|
|
</p>
|
2003-10-10 20:42:49 +02:00
|
|
|
</ul>
|
2003-10-23 20:10:28 +02:00
|
|
|
</div>
|
2003-10-10 20:42:49 +02:00
|
|
|
|
|
|
|
|
<!--===============================================================-->
|
2003-10-23 20:10:28 +02:00
|
|
|
<div class="doc_section"><h2><a name="progstructure">Programs
|
|
|
|
|
Structure</a></div>
|
2003-10-10 20:42:49 +02:00
|
|
|
<!--===============================================================-->
|
2003-10-23 20:10:28 +02:00
|
|
|
|
|
|
|
|
<div class="doc_text">
|
|
|
|
|
<p>
|
|
|
|
|
As mentioned previously, the Programs tree in llvm/test 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 Programs tests, the Programs tree 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>
|
|
|
|
|
</div>
|
2003-10-10 20:42:49 +02:00
|
|
|
|
|
|
|
|
<!--===============================================================-->
|
2003-10-23 20:10:28 +02:00
|
|
|
<div class="doc_section"><h2><a name="run">Running the LLVM Tests</a>
|
|
|
|
|
</div>
|
2003-10-10 20:42:49 +02:00
|
|
|
<!--===============================================================-->
|
|
|
|
|
|
2003-10-23 20:10:28 +02:00
|
|
|
<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>
|
2003-10-10 20:42:49 +02:00
|
|
|
The master Makefile in llvm/test is capable of running both the
|
|
|
|
|
QMTest driven tests and the Programs tests. By default, it will run
|
|
|
|
|
all of the tests.
|
2003-10-23 20:10:28 +02:00
|
|
|
</p><p>
|
2003-10-26 14:41:18 +01:00
|
|
|
To run only the QMTest driven tests, run <tt>gmake qmtest</tt> at the
|
2003-10-23 20:10:28 +02:00
|
|
|
command line in llvm/tests. To run a specific qmtest, suffix the test
|
2003-10-26 14:41:18 +01:00
|
|
|
name with ".t" when running gmake.
|
2003-10-23 20:10:28 +02:00
|
|
|
</p><p>
|
2003-10-10 20:42:49 +02:00
|
|
|
For example, to run the Regression.LLC tests, type
|
2003-10-26 14:41:18 +01:00
|
|
|
<tt>gmake Regression.LLC.t</tt> in llvm/tests.
|
2003-10-23 20:10:28 +02:00
|
|
|
</p><p>
|
2003-10-10 20:42:49 +02:00
|
|
|
Note that the Makefiles in llvm/test/Features and llvm/test/Regression
|
2003-10-23 20:10:28 +02:00
|
|
|
are gone. You must now use QMTest from the llvm/test directory to run
|
|
|
|
|
them.
|
|
|
|
|
</p><p>
|
|
|
|
|
To run the Programs test, cd into the llvm/test/Programs directory and
|
2003-10-26 14:41:18 +01:00
|
|
|
type <tt>gmake</tt>. Alternatively, you can type <tt>gmake
|
2003-10-10 20:42:49 +02:00
|
|
|
TEST=<type> test</tt> to run one of the specialized tests in
|
2003-10-23 20:10:28 +02:00
|
|
|
llvm/test/Programs/TEST.<type>.Makefile. For example, you could
|
|
|
|
|
run the nightly tester tests using the following commands:
|
|
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
<pre>
|
|
|
|
|
% cd llvm/test/Programs
|
2003-10-26 14:41:18 +01:00
|
|
|
% gmake TEST=nightly test
|
2003-10-23 20:10:28 +02:00
|
|
|
</pre>
|
2003-10-10 20:42:49 +02:00
|
|
|
|
|
|
|
|
<p>
|
2003-10-23 20:10:28 +02:00
|
|
|
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>
|
2003-10-10 20:42:49 +02:00
|
|
|
Some tests are known to fail. Some are bugs that we have not fixed yet;
|
2003-10-23 20:10:28 +02:00
|
|
|
others are features that we haven't added yet (or may never add). In
|
|
|
|
|
QMTest, 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 Programs tests have no such feature as of 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>
|
|
|
|
|
|
|
|
|
|
<!-- *********************************************************************** -->
|
|
|
|
|
|
|
|
|
|
<hr><font size="-1">
|
|
|
|
|
<address>John T. Criswell</address>
|
2003-10-27 19:18:16 +01:00
|
|
|
<a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a>
|
|
|
|
|
<br>
|
2003-10-23 20:10:28 +02:00
|
|
|
Last modified: $Date$
|
|
|
|
|
</font>
|
|
|
|
|
|
|
|
|
|
</body>
|
2003-10-10 20:42:49 +02:00
|
|
|
</html>
|
