RFR: 8254129: IR Test Framework to support regex-based matching on the IR in JTreg compiler tests [v2]

[Igor Ignatyev]

On Thu, 15 Apr 2021 13:19:56 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

>> This RFE provides an IR test framework to perform regex-based checks on the C2 IR shape of test methods emitted by the VM flags `-XX:+PrintIdeal` and `-XX:+PrintOptoAssembly`. The framework can also be used for other non-IR matching (and non-compiler) tests by providing easy to use annotations for commonly used testing patterns and compiler control flags.
>> 
>> The framework is based on the ideas of the currently present IR test framework in [Valhalla](https://github.com/openjdk/valhalla/blob/e9c78ce4fcfd01361c35883e0d68f9ae5a80d079/test/hotspot/jtreg/compiler/valhalla/inlinetypes/InlineTypeTest.java) (mainly implemented by @TobiHartmann) which is being used with great success. This new framework aims to replace the old one in Valhalla at some point.
>> 
>> A detailed description about how this new IR test framework works and how it is used is provided in the [README.md](https://github.com/chhagedorn/jdk/blob/aa005f384a4567c6c0b5f08f7c5df57f705dc540/test/lib/jdk/test/lib/hotspot/ir_framework/README.md) file and in the [Javadocs](https://github.com/chhagedorn/jdk/blob/aa005f384a4567c6c0b5f08f7c5df57f705dc540/test/lib/jdk/test/lib/hotspot/ir_framework/doc/jdk/test/lib/hotspot/ir_framework/package-summary.html) written for the framework classes.
>> 
>> To finish a first version of this framework for JDK 17, I decided to leave some improvement possibilities and ideas to be followed up on in additional RFEs. Some ideas are mentioned in "Future Work" in [README.md](https://github.com/chhagedorn/jdk/blob/aa005f384a4567c6c0b5f08f7c5df57f705dc540/test/lib/jdk/test/lib/hotspot/ir_framework/README.md) and were also created as subtasks of this RFE.
>> 
>> Testing (also described in "Internal Framework Tests in [README.md](https://github.com/chhagedorn/jdk/blob/aa005f384a4567c6c0b5f08f7c5df57f705dc540/test/lib/jdk/test/lib/hotspot/ir_framework/README.md)):
>> There are various tests to verify the correctness of the test framework which can be found as JTreg tests in the [tests](https://github.com/chhagedorn/jdk/tree/aa005f384a4567c6c0b5f08f7c5df57f705dc540/test/lib/jdk/test/lib/hotspot/ir_framework/tests) folder. Additional testing was performed by converting all compiler Inline Types test of project Valhalla (done by @katyapav in [JDK-8263024](https://bugs.openjdk.java.net/browse/JDK-8263024)) that used the old framework to the new framework. This provided additional testing for the framework itself. We ran the converted tests with all the flag settings used in hs-tier1-9 and hs-precheckin-comp. For sanity checking, this was also done with a sample IR test in mainline.
>> 
>> Some stats about the framework code added to [ir_framework](https://github.com/chhagedorn/jdk/tree/aa005f384a4567c6c0b5f08f7c5df57f705dc540/test/lib/jdk/test/lib/hotspot/ir_framework):
>> 
>> -  without the [Javadocs files](https://github.com/chhagedorn/jdk/tree/aa005f384a4567c6c0b5f08f7c5df57f705dc540/test/lib/jdk/test/lib/hotspot/ir_framework/doc) : 60 changed files, 13212 insertions, 0 deletions.
>>    - without the [tests](https://github.com/chhagedorn/jdk/tree/aa005f384a4567c6c0b5f08f7c5df57f705dc540/test/lib/jdk/test/lib/hotspot/ir_framework/tests)  and [examples](https://github.com/chhagedorn/jdk/tree/aa005f384a4567c6c0b5f08f7c5df57f705dc540/test/lib/jdk/test/lib/hotspot/ir_framework/examples) folder: 40 files changed, 6781 insertions
>>       - comments: 2399 insertions (calculated with `git diff --cached !(tests|examples) | grep -c -E "(^[+-]\s*(/)?*)|(^[+-]\s*//)"`)
>>       - which leaves 4382 lines of code inserted 
>> 
>> Big thanks to:
>> - @TobiHartmann for all his help by discussing the new framework and for providing insights from his IR test framework in Valhalla.
>> - @katyapav for converting the Valhalla tests to use the new framework which found some harder to catch bugs in the framework and also some actual C2 bugs.
>> - @iignatev for helping to simplify the framework usage with JTreg and with the framework internal VM calling structure.
>> - and others who provided valuable feedback.
>> 
>> Thanks,
>> Christian
>
> Christian Hagedorn has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Adjust whitelist

@chhagedorn , I haven't finished reviewing the patch, but I figure it would be better to re-review the patch after you address the prev comments, so I will post the few pending comments I had and will return to review the whole patch after we finish discussing prev. comments.

Cheers,
-- Igor

test/lib/jdk/test/lib/hotspot/ir_framework/IRMatcher.java line 182:

> 180:     private static void appendLine(StringBuilder builder, String line) {
> 181:         if (line.contains("&")) {
> 182:             line = line.replace("&", "&");

although I doubt it will ever be a problem in our use case, yet to be safe this replacement should be the last one, otherwise `&lt;` will become `<` while it should be `<`

test/lib/jdk/test/lib/hotspot/ir_framework/IRMatcher.java line 349:

> 347:             if (matchCount > 0) {
> 348:                 matcher.reset();
> 349:                 failMsg.append("    Regex ").append(nodeId).append(") ").append(nodeRegex).append("\n");

it seems you missed an opening parenthesis after `Regex ` .

test/lib/jdk/test/lib/hotspot/ir_framework/IRMatcher.java line 516:

> 514:      */
> 515:     public void appendIdealOutput(String idealOutput) {
> 516:         outputBuilder.setLength(0);

I doubt that a method named `append.*` should remove the previous values.

-------------

PR: https://git.openjdk.java.net/jdk/pull/3508