[ruby-core:110881] [Ruby master Misc#19149] Minimal covered tests with the --enable-yjit case?

["jaruga (Jun Aruga)" <noreply@ruby-lang.org>]

Issue #19149 has been reported by jaruga (Jun Aruga).

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Misc #19149: Minimal covered tests with the --enable-yjit case?
https://bugs.ruby-lang.org/issues/19149

* Author: jaruga (Jun Aruga)
* Status: Open
* Priority: Normal
----------------------------------------
In the [Fedora Ruby's RPM recipe file](https://src.fedoraproject.org/rpms/ruby/blob/rawhide/f/ruby.spec), we were running the commands below.

```
$ ./autogen.sh
$ ./configure ...
$ make
$ make check
```

## What is the minimal covered tests?

Now the we want to add the `--enable-yjit` option. Could you tell me what is the minimal covered test commands in the `--enable-yjit` case?

```
$ ./autogen.sh
$ ./configure --enable-yjit ...
$ make
$ ??
```

Then do we need to run the `make check` 2 times with both with yjit and without yjit as follows? The yjit command options `--yjit-call-threshold=1 --yjit-verify-ctx` comes from the <https://github.com/ruby/ruby/blob/d2fa67de81f66cb42cfeebc81a03c57a4621c09a/.github/workflows/yjit-ubuntu.yml#L59>.

```
$ make check
$ make check RUN_OPTS="--yjit-call-threshold=1 --yjit-verify-ctx"
```

Or is it good enough to run the `make check` and the specific tests with the yjit options as follows?

```
$ make check
$ make test-all RUN_OPTS="--yjit-call-threshold=1 --yjit-verify-ctx" TESTS="test/ruby/{test_yjit_exit_locations.rb,test_yjit.rb}"
```

Or is it good enough to run the `make check` with the YJIT options as follows?

```
$ make check RUN_OPTS="--yjit-call-threshold=1 --yjit-verify-ctx"
```

## YJIT command options

Could you explain why the command options `--yjit-call-threshold=1 --yjit-verify-ctx` above is better to test the YJIT cases rather than just `--yjit`?

## Ideal situation

I want to see the just running `make check` covers necessary cases in YJIT. Because it is convenience, and I think users tend to be satisfied with only running the `make check`. What do you think?

```
$ ./autogen.sh
$ ./configure --enable-yjit ...
$ make
$ make check
```

I tried to inject the YJIT command options in a test file for that. Perhaps it might be like this. But so far I am not succeeded.

```
diff --git a/test/lib/jit_support.rb b/test/lib/jit_support.rb
index 26f8542dc2..3fce402e32 100644
--- a/test/lib/jit_support.rb
+++ b/test/lib/jit_support.rb
@@ -69,8 +69,10 @@ def supported?
   end
 
   def yjit_supported?
+    return @yjit_supported if defined?(@yjit_supported)
     # e.g. x86_64-linux, x64-mswin64_140, x64-mingw32, x64-mingw-ucrt
-    RUBY_PLATFORM.match?(/^(x86_64|x64|arm64|aarch64)-/)
+    @yjit_supported = RbConfig::CONFIG["YJIT_SUPPORT"] != 'no' &&
+      RUBY_PLATFORM.match?(/^(x86_64|x64|arm64|aarch64)-/)
   end
 
   def remove_mjit_logs(stderr)
diff --git a/test/ruby/test_yjit.rb b/test/ruby/test_yjit.rb
index 9ab058d97b..10c8e3b891 100644
--- a/test/ruby/test_yjit.rb
+++ b/test/ruby/test_yjit.rb
@@ -8,7 +8,7 @@
 require 'tmpdir'
 require_relative '../lib/jit_support'
 
-return unless defined?(RubyVM::YJIT) && RubyVM::YJIT.enabled?
+return unless JITSupport.yjit_supported?
 
 # Tests for YJIT with assertions on compilation and side exits
 # insipired by the MJIT tests in test/ruby/test_mjit.rb
```




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