mirror of
https://github.com/RPCSX/llvm.git
synced 2024-12-05 02:16:46 +00:00
70360e6762
- If anyone is interested in lit's feature set, I'd appreciate any comments on the elaborated items. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188590 91177308-0d34-0410-b5e6-96231b3b80d8
140 lines
6.3 KiB
Plaintext
140 lines
6.3 KiB
Plaintext
================
|
|
lit TODO Items
|
|
================
|
|
|
|
Infrastructure
|
|
==============
|
|
|
|
1. Change to always load suites, then resolve command line arguments?
|
|
|
|
Currently we expect each input argument to be a path on disk; we do a
|
|
recursive search to find the test suite for each item, but then we only do a
|
|
local search based at the input path to find tests. Additionally, for any path
|
|
that matches a file on disk we explicitly construct a test instance (bypassing
|
|
the formats on discovery implementation).
|
|
|
|
This has a couple problems:
|
|
|
|
* The test format doesn't have control over the test instances that result
|
|
from file paths.
|
|
|
|
* It isn't possible to specify virtual tests as inputs. For example, it is not
|
|
possible to specify an individual subtest to run with the googletest format.
|
|
|
|
* The test format doesn't have full control over the discovery of tests in
|
|
subdirectories.
|
|
|
|
Instead, we should move to a model whereby first all of the input specifiers
|
|
are resolved to test suites, and then the resolution of the input specifier is
|
|
delegated to each test suite. This could take a couple forms:
|
|
|
|
* We could resolve to test suites, then fully load each test suite, then have
|
|
a fixed process to map input specifiers to tests in the test suite
|
|
(presumably based on path-in-suite derivations). This has the benefit of
|
|
being consistent across all test formats, but the downside of requiring
|
|
loading the entire test suite.
|
|
|
|
* We could delegate all of the resolution of specifiers to the test
|
|
suite. This would allow formats that anticipate large test suites to manage
|
|
their own resolution for better performance. We could provide a default
|
|
resolution strategy that was similar to what we do now (start at subpaths
|
|
for directories, but allow the test format control over what happens for
|
|
individual tests).
|
|
|
|
2. Consider move to identifying all tests by path-to-test-suite and then path to
|
|
subtest, and don't use test suite names.
|
|
|
|
Currently the test suite name is presented as part of test names, but it has
|
|
no other useful function, and it is something that has to be skipped over to
|
|
cut-and-paste a name to subsequently use to rerun a test. If we just
|
|
represented each test suite by the path to its suite, then it would allow more
|
|
easy cut-and-paste of the test output lines. This has the downside that the
|
|
lines might get rather long.
|
|
|
|
3. Allow 'lit' driver to cooperate with test formats and suites to add options
|
|
(or at least sanitize accepted params).
|
|
|
|
We have started to use the --params method more and more extensively, and it is
|
|
cumbersome and error prone. Additionally, there are currently various options
|
|
``lit`` honors that should more correctly be specified as belonging to the
|
|
ShTest test format.
|
|
|
|
It would be really nice if we could allow test formats and test suites to add
|
|
their own options to be parsed. The difficulty here, of course, is that we
|
|
don't know what test formats or test suites are in use until we have parsed the
|
|
input specifiers. For test formats we could ostensibly require all the possible
|
|
formats to be registered in order to have options, but for test suites we would
|
|
certainly have to load the suite before we can query it for what options it
|
|
understands.
|
|
|
|
That leaves us with the following options:
|
|
|
|
* Currently we could almost get away with parsing the input specifiers without
|
|
having done option parsing first (the exception is ``--config-prefix``) but
|
|
that isn't a very extensible design.
|
|
|
|
* We could make a distinction in the command line syntax for test format and
|
|
test suite options. For example, we could require something like::
|
|
|
|
lit -j 1 -sv input-specifier -- --some-format-option
|
|
|
|
which would be relatively easy to implement with optparser (I think).
|
|
|
|
* We could allow fully interspersed arguments by first extracting the options
|
|
lit knows about and parsing them, then dispatching the remainder to the
|
|
formats. This seems the most convenient for users, who are unlikely to care
|
|
about (or even be aware of) the distinction between the generic lit
|
|
infrastructure and format or suite specific options.
|
|
|
|
4. Eliminate duplicate execution models for ShTest tests.
|
|
|
|
Currently, the ShTest format uses tests written with shell-script like syntax,
|
|
and executes them in one of two ways. The first way is by converting them into
|
|
a bash script and literally executing externally them using bash. The second
|
|
way is through the use of an internal shell parser and shell execution code
|
|
(built on the subprocess module). The external execution mode is used on most
|
|
Unix systems that have bash, the internal execution mode is used on Windows.
|
|
|
|
Having two ways to do the same thing is error prone and leads to unnecessary
|
|
complexity in the testing environment. Additionally, because the mode that
|
|
converts scripts to bash doesn't try and validate the syntax, it is possible
|
|
to write tests that use bash shell features unsupported by the internal
|
|
shell. Such tests won't work on Windows but this may not be obvious to the
|
|
developer writing the test.
|
|
|
|
Another limitation is that when executing the scripts externally, the ShTest
|
|
format has no idea which commands fail, or what output comes from which
|
|
commands, so this limits how convenient the output of ShTest failures can be
|
|
and limits other features (for example, knowing what temporary files were
|
|
written).
|
|
|
|
We should eliminate having two ways of executing the same tests to reduce
|
|
platform differences and make it easier to develop new features in the ShTest
|
|
module. This is currently blocked on:
|
|
|
|
* The external execution mode is faster in some situations, because it avoids
|
|
being bottlenecked on the GIL. We could fix this by moving to a good
|
|
multiprocessing model.
|
|
|
|
* Some tests in LLVM/Clang are explicitly disabled with the internal shell
|
|
(because they use features specific to bash). We would need to rewrite these
|
|
tests, or add additional features to the internal shell handling to allow
|
|
them to pass.
|
|
|
|
|
|
Miscellaneous
|
|
=============
|
|
|
|
* Move temp directory name into local test config.
|
|
|
|
* Add --show-unsupported, don't show by default?
|
|
|
|
* Optionally use multiprocessing.
|
|
|
|
* Support valgrind in all configs, and LLVM style valgrind.
|
|
|
|
* Support a timeout / ulimit.
|
|
|
|
* Create an explicit test suite object (instead of using the top-level
|
|
TestingConfig object).
|