Implement splat for cfuncs. Split exit exit cases to better capture where we are exiting (#6929)

YJIT: Implement splat for cfuncs. Split exit cases

This also implements a new check for ruby2keywords as the last
argument of a splat. This does mean that we generate more code, but in
actual benchmarks where we gained speed from this (binarytrees) I
don't see any significant slow down. I did have to struggle here with
the register allocator to find code that didn't allocate too many
registers. It's a bit hard when everything is implicit. But I think I
got to the minimal amount of copying and stuff given our current
allocation strategy.

1 files changed, 25 insertions, 0 deletions

diff --git a/bootstraptest/test_yjit.rb b/bootstraptest/test_yjit.rb
index 9d9143d265..cbb3f145b0 100644
--- a/bootstraptest/test_yjit.rb
+++ b/bootstraptest/test_yjit.rb
@@ -3456,3 +3456,28 @@ assert_equal 'ok', %q{
 
   cw(4)
 }
+
+assert_equal 'threw', %q{
+  def foo(args)
+    wrap(*args)
+  rescue ArgumentError
+    'threw'
+  end
+
+  def wrap(a)
+    [a]
+  end
+
+  foo([Hash.ruby2_keywords_hash({})])
+}
+
+assert_equal 'threw', %q{
+  # C call
+  def bar(args)
+    Array(*args)
+  rescue ArgumentError
+    'threw'
+  end
+
+  bar([Hash.ruby2_keywords_hash({})])
+}