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This reverts commits for [Feature #18589]:
* 8008fb7352abc6fba433b99bf20763cf0d4adb38
"Update formatting per feedback"
* 8f6eaca2e19828e92ecdb28b0fe693d606a03f96
"Delete ID from constant cache table if it becomes empty on ISEQ free"
* 629908586b4bead1103267652f8b96b1083573a8
"Finer-grained inline constant cache invalidation"
MSWin builds on AppVeyor have been crashing since the merger.
Notes:
Merged: https://github.com/ruby/ruby/pull/5715
Merged-By: nobu <nobu@ruby-lang.org>
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Current behavior - caches depend on a global counter. All constant mutations cause caches to be invalidated.
```ruby
class A
B = 1
end
def foo
A::B # inline cache depends on global counter
end
foo # populate inline cache
foo # hit inline cache
C = 1 # global counter increments, all caches are invalidated
foo # misses inline cache due to `C = 1`
```
Proposed behavior - caches depend on name components. Only constant mutations with corresponding names will invalidate the cache.
```ruby
class A
B = 1
end
def foo
A::B # inline cache depends constants named "A" and "B"
end
foo # populate inline cache
foo # hit inline cache
C = 1 # caches that depend on the name "C" are invalidated
foo # hits inline cache because IC only depends on "A" and "B"
```
Examples of breaking the new cache:
```ruby
module C
# Breaks `foo` cache because "A" constant is set and the cache in foo depends
# on "A" and "B"
class A; end
end
B = 1
```
We expect the new cache scheme to be invalidated less often because names aren't frequently reused. With the cache being invalidated less, we can rely on its stability more to keep our constant references fast and reduce the need to throw away generated code in YJIT.
Notes:
Merged: https://github.com/ruby/ruby/pull/5433
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In the past, many internal functions are declared in intern.h
under include/ruby directory, because there were no headers for
internal use.
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Must not be a bad idea to improve documents. [ci skip]
Notes:
Merged: https://github.com/ruby/ruby/pull/4815
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Truly editorial fix for comments. This works better with Emacs'
set-justification-full function. [ci skip]
Notes:
Merged: https://github.com/ruby/ruby/pull/4815
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It is questionable whether we can change a public API but this function
does not exist today. No way.
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To fix build failures.
Notes:
Merged: https://github.com/ruby/ruby/pull/3079
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Devs do not love "impl".
Notes:
Merged: https://github.com/ruby/ruby/pull/3079
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