Load the debug information during runtime startup if OCAMLRUNPARAM=b=2.
This guards against the specific case of running out of fds, since the
debug information can't then be loaded.
dereference a pointer before checking it is not a naked pointer.
Algo fix a debug macro changed in PR9742 which could potentially
modify its parameter. It turns out this is not a bug, but the macro
was still particularly dangerous.
Instead, we use a thread-local variable [callback_status] which
contains the index of the corresponding entry when a callback is
running. We can do this since there can only be one running callback
at the same time in a given thread.
This lifts the restriction forbidding the call of Thread.exit from a
memprof callback.
This is done by using a local entry array for each thread, containing
tracked blocks whose allocation callback has not yet been called.
This allows some simplification in the code running callbacks for
young allocations. Indeed, since the entry array is local to one
thread, we know for sure that it cannot be modified during a callback,
and therefore we no longer need to remember the indices of the
corresponding new entries.
Reasons:
- Better abstraction in memprof.h
- Simpler Saving/restore functions
- We introduce a current's thread context, so that we don't need to do a spacial case for the current thread
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>
Stephen Dolan
David Allsopp
Jacques-Henri Jourdan
Leo White
Greta Yorsh
Florian Angeletti
jacobly0
Xavier Leroy
Damien Doligez
Nicolás Ojeda Bär
KC Sivaramakrishnan
Sadiq Jaffer