The Spacetime memory profiler is not going to be supported in Multicore OCaml, and is already broken by some of the related changes in OCaml 4.12. The core development team decided to remove Spacetime support from OCaml 4.12.
This is selected at configure-time, option --enable-naked-pointers-checker.
The major GC warns when it detects out-of-heap pointers that could cause the no-naked-pointers runtime system to crash.
This is supported on x86-64 only, but on all ports (Unix and Windows).
Added tests involving naked pointers in tests/runtime-naked-pointers
Co-authored-by: KC Sivaramakrishnan <kc@kcsrk.info>
Co-authored-by: David Allsopp <david.allsopp@metastack.com>
Co-authored-by: Enguerrand Decorne <decorne.en@gmail.com>
`List.equal f foo bar` is nicer than
`List.length foo = List.length bar && List.for_all2 f foo bar`.
Note: with List.compare there is a risk of users having opened the
List module, and then using 'compare' from the stdlib unqualified. For
example:
List.(sort compare foo bar)
Such code will break (type error), and has to be fixed by using
Stdlib.compare. Stdlib is available since OCaml 4.07; people wishing
to support both 4.12 and older releases would have to avoid opening
List, or rebind 'compare' locally.
```ocaml
val left : 'a -> ('a, 'b) t
val right : 'b -> ('a, 'b) t
val is_left : ('a, 'b) t -> bool
val is_right : ('a, 'b) t -> bool
val find_left : ('a, 'b) t -> 'a option
val find_right : ('a, 'b) t -> 'b option
val map_left : ('a1 -> 'a2) -> ('a1, 'b) t -> ('a2, 'b) t
val map_right : ('b1 -> 'b2) -> ('a, 'b1) t -> ('a, 'b2) t
val map : left:('a1 -> 'a2) -> right:('b1 -> 'b2) -> ('a1, 'b1) t -> ('a2, 'b2) t
val fold : left:('a -> 'c) -> right:('b -> 'c) -> ('a, 'b) t -> 'c
val equal :
left:('a -> 'a -> bool) -> right:('b -> 'b -> bool) ->
('a, 'b) t -> ('a, 'b) t -> bool
val compare :
left:('a -> 'a -> int) -> right:('b -> 'b -> int) ->
('a, 'b) t -> ('a, 'b) t -> int
```
Unlike [result], no [either] type is made available in Stdlib,
one needs to access [Either.t] explicitly:
- This type is less common in typical OCaml codebases,
which prefer domain-specific variant types whose constructors
carry more meaning.
- Adding this to Stdlib would raise warnings in existing codebases
that already use a constructor named Left or Right:
+ when opening a module that exports such a name,
warning 45 is raised
+ adding a second constructor of the same name in scope kicks
in the disambiguation mechanisms, and warning 41 may now
be raised by existing code.
If the use becomes more common in the future we can always
revisit this choice.
Mehdi Bouaziz
Xavier Leroy
Damien Doligez
Nicolás Ojeda Bär
Joan Thibault
Daniel Bünzli
Thomas Refis
Gabriel Scherer
Florian Angeletti
Albin Coquereau
John Whitington
Xavier Leroy
David Allsopp
Jeremy Yallop
Raphaël Proust