[pull] master from ruby:master #296
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call-seq:
Ractor.sharable_proc(self: nil){} -> sharable proc
It returns shareable Proc object. The Proc object is
shareable and the self in a block will be replaced with
the value passed via `self:` keyword.
In a shareable Proc, the outer variables should
* (1) refer shareable objects
* (2) be not be overwritten
```ruby
a = 42
Ractor.shareable_proc{ p a }
#=> OK
b = 43
Ractor.shareable_proc{ p b; b = 44 }
#=> Ractor::IsolationError because 'b' is reassigned in the block.
c = 44
Ractor.shareable_proc{ p c }
#=> Ractor::IsolationError because 'c' will be reassigned outside of the block.
c = 45
d = 45
d = 46 if cond
Ractor.shareable_proc{ p d }
#=> Ractor::IsolationError because 'd' was reassigned outside of the block.
```
The last `d`'s case can be relaxed in a future version.
The above check will be done in a static analysis at compile time,
so the reflection feature such as `Binding#local_varaible_set`
can not be detected.
```ruby
e = 42
shpr = Ractor.shareable_proc{ p e } #=> OK
binding.local_variable_set(:e, 43)
shpr.call #=> 42 (returns captured timing value)
```
Ractor.sharaeble_lambda is also introduced.
[Feature #21550]
[Feature #21557]
to catch up new sharable proc semantics.
ZJIT: Add stack overflow check to gen_ccall_variadic
ZJIT never sets `cfp->jit_return`, so to avoid crashing while profiling, we need to explicitly validate the PC of the top most frame. Particularly pertinent for profilers that call rb_profile_frames() from within a signal handler such as Vernier and Stackprof since they can sample at any time and observe an invalid PC.
* ZJIT: Allow testing JIT code on zjit-test * Resurrect TestingAllocator tests
`ibf_dump_write()` should consider the size of the element.
If pkg_config returns a truthy value, it found the library and added it
to the global values for the Makefile.
Calling `find_library` after a successful `pkg_config` causes -lyaml to
appear twice in the LIBS variable in the resulting Makefile, and causes
ld on macOS to emit a warning:
$ bundle exec rake compile 2>&1 | grep warning
ld: warning: ignoring duplicate libraries: '-lyaml'
ruby/psych@cb5e3d465c
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