mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-21 18:29:46 +00:00
against the developer policy to include this sort of thing as SVN blame already captures this in a far more fine-grained way. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172109 91177308-0d34-0410-b5e6-96231b3b80d8
277 lines
11 KiB
ReStructuredText
277 lines
11 KiB
ReStructuredText
==============================
|
|
LLVM test-suite Makefile Guide
|
|
==============================
|
|
|
|
.. contents::
|
|
:local:
|
|
|
|
Overview
|
|
========
|
|
|
|
This document describes the features of the Makefile-based LLVM
|
|
test-suite. This way of interacting with the test-suite is deprecated in
|
|
favor of running the test-suite using LNT, but may continue to prove
|
|
useful for some users. See the Testing Guide's :ref:`test-suite Quickstart
|
|
<test-suite-quickstart>` section for more information.
|
|
|
|
Test suite Structure
|
|
====================
|
|
|
|
The ``test-suite`` module contains a number of programs that can be
|
|
compiled with LLVM and executed. These programs are compiled using the
|
|
native compiler and various LLVM backends. The output from the program
|
|
compiled with the native compiler is assumed correct; the results from
|
|
the other programs are compared to the native program output and pass if
|
|
they match.
|
|
|
|
When executing tests, it is usually a good idea to start out with a
|
|
subset of the available tests or programs. This makes test run times
|
|
smaller at first and later on this is useful to investigate individual
|
|
test failures. To run some test only on a subset of programs, simply
|
|
change directory to the programs you want tested and run ``gmake``
|
|
there. Alternatively, you can run a different test using the ``TEST``
|
|
variable to change what tests or run on the selected programs (see below
|
|
for more info).
|
|
|
|
In addition for testing correctness, the ``test-suite`` directory also
|
|
performs timing tests of various LLVM optimizations. It also records
|
|
compilation times for the compilers and the JIT. This information can be
|
|
used to compare the effectiveness of LLVM's optimizations and code
|
|
generation.
|
|
|
|
``test-suite`` tests are divided into three types of tests: MultiSource,
|
|
SingleSource, and External.
|
|
|
|
- ``test-suite/SingleSource``
|
|
|
|
The SingleSource directory contains test programs that are only a
|
|
single source file in size. These are usually small benchmark
|
|
programs or small programs that calculate a particular value. Several
|
|
such programs are grouped together in each directory.
|
|
|
|
- ``test-suite/MultiSource``
|
|
|
|
The MultiSource directory contains subdirectories which contain
|
|
entire programs with multiple source files. Large benchmarks and
|
|
whole applications go here.
|
|
|
|
- ``test-suite/External``
|
|
|
|
The External directory contains Makefiles for building code that is
|
|
external to (i.e., not distributed with) LLVM. The most prominent
|
|
members of this directory are the SPEC 95 and SPEC 2000 benchmark
|
|
suites. The ``External`` directory does not contain these actual
|
|
tests, but only the Makefiles that know how to properly compile these
|
|
programs from somewhere else. The presence and location of these
|
|
external programs is configured by the test-suite ``configure``
|
|
script.
|
|
|
|
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.
|
|
|
|
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 the
|
|
regression tests, the result for such tests will be XFAIL (eXpected
|
|
FAILure). In this way, you can tell the difference between an expected
|
|
and unexpected failure.
|
|
|
|
The tests in the test suite 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.
|
|
|
|
Running the test suite
|
|
======================
|
|
|
|
First, all tests are executed within the LLVM object directory tree.
|
|
They *are not* executed inside of the LLVM source tree. This is because
|
|
the test suite creates temporary files during execution.
|
|
|
|
To run the test suite, you need to use the following steps:
|
|
|
|
#. ``cd`` into the ``llvm/projects`` directory in your source tree.
|
|
#. Check out the ``test-suite`` module with:
|
|
|
|
.. code-block:: bash
|
|
|
|
% svn co http://llvm.org/svn/llvm-project/test-suite/trunk test-suite
|
|
|
|
This will get the test suite into ``llvm/projects/test-suite``.
|
|
|
|
#. Configure and build ``llvm``.
|
|
|
|
#. Configure and build ``llvm-gcc``.
|
|
|
|
#. Install ``llvm-gcc`` somewhere.
|
|
|
|
#. *Re-configure* ``llvm`` from the top level of each build tree (LLVM
|
|
object directory tree) in which you want to run the test suite, just
|
|
as you do before building LLVM.
|
|
|
|
During the *re-configuration*, you must either: (1) have ``llvm-gcc``
|
|
you just built in your path, or (2) specify the directory where your
|
|
just-built ``llvm-gcc`` is installed using
|
|
``--with-llvmgccdir=$LLVM_GCC_DIR``.
|
|
|
|
You must also tell the configure machinery that the test suite is
|
|
available so it can be configured for your build tree:
|
|
|
|
.. code-block:: bash
|
|
|
|
% cd $LLVM_OBJ_ROOT ; $LLVM_SRC_ROOT/configure [--with-llvmgccdir=$LLVM_GCC_DIR]
|
|
|
|
[Remember that ``$LLVM_GCC_DIR`` is the directory where you
|
|
*installed* llvm-gcc, not its src or obj directory.]
|
|
|
|
#. You can now run the test suite from your build tree as follows:
|
|
|
|
.. code-block:: bash
|
|
|
|
% cd $LLVM_OBJ_ROOT/projects/test-suite
|
|
% make
|
|
|
|
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).
|
|
|
|
Configuring External Tests
|
|
--------------------------
|
|
|
|
In order to run the External tests in the ``test-suite`` module, you
|
|
must specify *--with-externals*. This must be done during the
|
|
*re-configuration* step (see above), and the ``llvm`` re-configuration
|
|
must recognize the previously-built ``llvm-gcc``. If any of these is
|
|
missing or neglected, the External tests won't work.
|
|
|
|
* *--with-externals*
|
|
|
|
* *--with-externals=<directory>*
|
|
|
|
This tells LLVM where to find any external tests. They are expected to
|
|
be in specifically named subdirectories of <``directory``>. If
|
|
``directory`` is left unspecified, ``configure`` uses the default value
|
|
``/home/vadve/shared/benchmarks/speccpu2000/benchspec``. Subdirectory
|
|
names known to LLVM include:
|
|
|
|
* spec95
|
|
|
|
* speccpu2000
|
|
|
|
* speccpu2006
|
|
|
|
* povray31
|
|
|
|
Others are added from time to time, and can be determined from
|
|
``configure``.
|
|
|
|
Running different tests
|
|
-----------------------
|
|
|
|
In addition to the regular "whole program" tests, the ``test-suite``
|
|
module also provides a mechanism for compiling the programs in different
|
|
ways. If the variable TEST is defined on the ``gmake`` command line, the
|
|
test system will include a Makefile named
|
|
``TEST.<value of TEST variable>.Makefile``. This Makefile can modify
|
|
build rules to yield different results.
|
|
|
|
For example, the LLVM nightly tester uses ``TEST.nightly.Makefile`` to
|
|
create the nightly test reports. To run the nightly tests, run
|
|
``gmake TEST=nightly``.
|
|
|
|
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.
|
|
|
|
Generating test output
|
|
----------------------
|
|
|
|
There are a number of ways to run the tests and generate output. The
|
|
most simple one is simply running ``gmake`` with no arguments. This will
|
|
compile and run all programs in the tree using a number of different
|
|
methods and compare results. Any failures are reported in the output,
|
|
but are likely drowned in the other output. Passes are not reported
|
|
explicitly.
|
|
|
|
Somewhat better is running ``gmake TEST=sometest test``, which runs the
|
|
specified test and usually adds per-program summaries to the output
|
|
(depending on which sometest you use). For example, the ``nightly`` test
|
|
explicitly outputs TEST-PASS or TEST-FAIL for every test after each
|
|
program. Though these lines are still drowned in the output, it's easy
|
|
to grep the output logs in the Output directories.
|
|
|
|
Even better are the ``report`` and ``report.format`` targets (where
|
|
``format`` is one of ``html``, ``csv``, ``text`` or ``graphs``). The
|
|
exact contents of the report are dependent on which ``TEST`` you are
|
|
running, but the text results are always shown at the end of the run and
|
|
the results are always stored in the ``report.<type>.format`` file (when
|
|
running with ``TEST=<type>``). The ``report`` also generate a file
|
|
called ``report.<type>.raw.out`` containing the output of the entire
|
|
test run.
|
|
|
|
Writing custom tests for the test suite
|
|
---------------------------------------
|
|
|
|
Assuming you can run the test suite, (e.g.
|
|
"``gmake TEST=nightly report``" should work), it is really easy to run
|
|
optimizations or code generator components against every program in the
|
|
tree, collecting statistics or running custom checks for correctness. At
|
|
base, this is how the nightly tester works, it's just one example of a
|
|
general framework.
|
|
|
|
Lets say that you have an LLVM optimization pass, and you want to see
|
|
how many times it triggers. First thing you should do is add an LLVM
|
|
`statistic <ProgrammersManual.html#Statistic>`_ to your pass, which will
|
|
tally counts of things you care about.
|
|
|
|
Following this, you can set up a test and a report that collects these
|
|
and formats them for easy viewing. This consists of two files, a
|
|
"``test-suite/TEST.XXX.Makefile``" fragment (where XXX is the name of
|
|
your test) and a "``test-suite/TEST.XXX.report``" file that indicates
|
|
how to format the output into a table. There are many example reports of
|
|
various levels of sophistication included with the test suite, and the
|
|
framework is very general.
|
|
|
|
If you are interested in testing an optimization pass, check out the
|
|
"libcalls" test as an example. It can be run like this:
|
|
|
|
.. code-block:: bash
|
|
|
|
% cd llvm/projects/test-suite/MultiSource/Benchmarks # or some other level
|
|
% make TEST=libcalls report
|
|
|
|
This will do a bunch of stuff, then eventually print a table like this:
|
|
|
|
::
|
|
|
|
Name | total | #exit |
|
|
...
|
|
FreeBench/analyzer/analyzer | 51 | 6 |
|
|
FreeBench/fourinarow/fourinarow | 1 | 1 |
|
|
FreeBench/neural/neural | 19 | 9 |
|
|
FreeBench/pifft/pifft | 5 | 3 |
|
|
MallocBench/cfrac/cfrac | 1 | * |
|
|
MallocBench/espresso/espresso | 52 | 12 |
|
|
MallocBench/gs/gs | 4 | * |
|
|
Prolangs-C/TimberWolfMC/timberwolfmc | 302 | * |
|
|
Prolangs-C/agrep/agrep | 33 | 12 |
|
|
Prolangs-C/allroots/allroots | * | * |
|
|
Prolangs-C/assembler/assembler | 47 | * |
|
|
Prolangs-C/bison/mybison | 74 | * |
|
|
...
|
|
|
|
This basically is grepping the -stats output and displaying it in a
|
|
table. You can also use the "TEST=libcalls report.html" target to get
|
|
the table in HTML form, similarly for report.csv and report.tex.
|
|
|
|
The source for this is in ``test-suite/TEST.libcalls.*``. The format is
|
|
pretty simple: the Makefile indicates how to run the test (in this case,
|
|
"``opt -simplify-libcalls -stats``"), and the report contains one line
|
|
for each column of the output. The first value is the header for the
|
|
column and the second is the regex to grep the output of the command
|
|
for. There are lots of example reports that can do fancy stuff.
|