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Working version
---------------
### Language features:
- #9975, #11365: Make empty types (`type t = |`) immediate.
(Antal Spector-Zabusky, review by Gabriel Scherer)
* #11694: Add short syntax for generative functor types `() -> ...`
(Jeremy Yallop, review by Gabriel Scherer, Nicolás Ojeda Bär,
Jacques Garrigue)
- #11457: Remove old polymorphic variant syntax.
With ``type t = [ `A | `B ]``, one could use the syntax `#t` in types,
where it means the same thing as `[< t]`, and in patterns, where it means
``(`A | `B)``. The use of `#t` in types for polymorphic variants
was deprecated since 2001, and is now removed. The syntax remains available
in patterns, or for objects -- when `t` is a class type.
(Stefan Muenzel, review by Gabriel Scherer and Jacques Garrigue)
- #11984: Add dedicated syntax for generative functor application.
Previously, OCaml did not disinguish between `F ()` and
`F (struct end)`, even though the latter looks applicative. Instead,
the decision between generative and applicative functor application
was made based on the type of `F`. With this patch, we now distinguish
these two application forms; writing `F (struct end)` for a generative
functor leads to new warning 73.
(Frederic Bour and Richard Eisenberg, review by Florian Angeletti)
### Runtime system:
- #12099: Add ocamlrund option, -events, to produce a trace of
debug events during bytecode interpretation. Fixes #12098.
(Richard L Ford, review by Gabriel Scherer)
- #12001: Fix book keeping for last finalisers during the minor cycle
(KC Sivaramakrishnan and Enguerrand Decorne, report by Guillaume Bury
and Vincent Laviron, review by Sadiq Jaffer and KC Sivaramakrishnan)
- #11919: New runtime events counters for major heap stats and minor heap
resizing.
(Sadiq Jaffer, review by Gabriel Scherer and David Allsopp)
- #11287, #11872, #11955: Clean up reserved header bits (once used for
Spacetime profiling).
(Nick Barnes, review by Gabriel Scherer and Damien Doligez)
- #11750: Decouple major slice from minor GC.
(KC Sivaramakrishnan, review by Sadiq Jaffer, Guillaume Munch-Maccagnoni and
Damien Doligez)
- #11642: Restore Cygwin port. Add GC messages for address space reservations
when OCAMLRUNPARAM option v includes 0x1000.
(David Allsopp, review by Xavier Leroy, Guillaume Munch-Maccagnoni
and Gabriel Scherer)
- #11743: Speed up weak array operations
(KC Sivaramakrishnan, review by François Bobot and Sadiq Jaffer)
- #11691, #11706: use __asm__ instead of asm for strict ISO C conformance
(Xavier Leroy, report by Gregg Reynolds , review by Sadiq Jaffer)
- #11764: add prototypes to old-style C function definitions and declarations
(Antonin Décimo, review by Xavier Leroy)
- #11796: protect lazy computation of code fragment digest by a mutex.
This makes the thread sanitizer happier, and avoids duplicating
the hashing work.
(Gabriel Scherer, review by Xavier Leroy, report by Olivier Nicole)
- #11137: new `Unsafe_store_tag(val, new_tag)` macro to stop using
`Tag_val(val)` as lvalue.
(Gabriel Scherer, review by Xavier Leroy, Guillaume Munch-Maccagnoni
and Nicolás Ojeda Bär)
- #11880: Restore the correct sigmask in systhreads.
(Christiano Haesbaert, review by Guillaume Munch-Maccagnoni and
Sébastien Hinderer)
- #11881: Fix thread-unsafety of registration of operations for "custom"
values.
(Guillaume Munch-Maccagnoni, review by Gabriel Scherer and KC
Sivaramakrishnan)
- #11474, #11998, #12065: Add support for user-defined events in the runtime
event tracing system.
(Lucas Pluvinage, review by Sadiq Jaffer, Guillaume Munch-Maccagnoni,
Enguerrand Decorne, Gabriel Scherer and Anil Madhavapeddy)
- #11693: Remove use of C99 Variable Length Arrays (VLAs) in the runtime.
(David Allsopp, review by Xavier Leroy, Guillaume Munch-Maccagnoni,
Stefan Muenzel and Gabriel Scherer)
- #11827: Restore prefetching for GC marking
(Fabrice Buoro and Stephen Dolan, review by Gabriel Scherer and Sadiq Jaffer)
- #11935: Load frametables of dynlink'd modules in batch
(Stephen Dolan, review by David Allsopp and Guillaume Munch-Maccagnoni)
- #11980: fix quadratic behavior in natdynlink by using a STW section
for frame-descriptor updates.
(Gabriel Scherer, review by Sadiq Jaffer, report by André Maroneze
for Frama-C and Guillaume Melquiond for Coq)
- #12062: fix runtime events consumer: when events are dropped they shouldn't be
parsed. (Lucas Pluvinage)
- #12121: unrooted implementations of caml_callback*_exn
(Gabriel Scherer, review by KC Sivaramakrishnan and Xavier Leroy)
- #12132: Fix overcounting of minor collections in GC stats.
(Damien Doligez, review by Gabriel Scherer)
### Type system:
- #6941, #11187: prohibit using classes through recursive modules
inheriting or including a class belonging to a mutually-recursive module
would previous behave incorrectly, and now results in a clean error.
(Leo White, review by Gabriel Scherer and Florian Angeletti)
- #11912: Refactoring handling of scoped type variables
(Richard Eisenberg, review by Gabriel Scherer and Florian Angeletti)
### Code generation and optimizations:
- #11967: Remove traces of Obj.truncate, which allows some mutable
loads to become immutable.
(Nick Barnes, review by Vincent Laviron and KC Sivaramakrishnan)
- #9945, #10883: Turn boolean-result float comparisons into primitive operations
Uses the architecture's elementary operations for float comparisons,
when available, rather than branching and then setting the return value.
(Stefan Muenzel, review by Stephen Dolan, Alain Frisch and Vincent Laviron)
- #8998, #11321, #11430: change mangling of OCaml long identifiers
from `camlModule__name_NNN` to `camlModule.name_NNN`. The previous
mangling schema, using `__`, was ambiguous.
(Xavier Leroy, report by sliquister and Michael Bacarella,
review by Gabriel Scherer)
- #10834: The -safer-matching option disables type-based optimizations of
pattern-matching compilation. This allows to produce a match failure if
a pattern-matching was wrongly assumed to be exhaustive. Since the
exhaustiveness check for GADTs has had bugs in the past, it may be
useful if you need extra security with GADTs.
(Jacques Garrigue, review by Gabriel Scherer)
- #11102: Speed up register allocation by permanently spilling registers
(Stephen Dolan, review by Xavier Leroy)
- #11383: Restrict the local function optimisation to forbid moving code
inside a sub-function
(Vincent Laviron, review by Gabriel Scherer)
- #11418, #11708: RISC-V multicore support.
(Nicolás Ojeda Bär, review by KC Sivaramakrishnan)
- #11686: Better spilling heuristic for the Linear Scan allocator for more
efficient stack usage.
(Nicolás Ojeda Bär, Gabriel Scherer, Alain Frisch, review by Gabriel Scherer,
Alain Frisch and Nathanaëlle Courant)
- #11904: Remove arm, i386 native-code backends.
(Nicolás Ojeda Bär, review by Stephen Dolan, Anil Madhavapeddy, and Xavier
Leroy)
### Standard library:
* #11565: Enable -strict-formats by default. Some incorrect format
specifications (for `printf`) where silently ignored and now fail.
Those new failures occur at compile-time, except if you use advanced
format features like `%(...%)` that parse format strings dynamically.
Pass -no-strict-formats to revert to the previous lenient behavior.
(Nicolás Ojeda Bär, review by David Allsopp)
- #11883, #11884: Update documentation for In_channel and Out_channel
with examples and sections to group related functions.
(Kiran Gopinathan, review by Daniel Bünzli and Xavier Leroy)
- #11878, #11965: Prevent seek_in from marking buffer data as valid after
closing the channel. This could lead to inputting uninitialized bytes.
(Samuel Hym, review by Xavier Leroy and Olivier Nicole)
- #11848: Add `List.find_mapi`, `List.find_index`, `Seq.find_mapi`,
`Seq.find_index`, `Array.find_mapi`, `Array.find_index`,
`Float.Array.find_opt`, `Float.Array.find_index`, `Float.Array.find_map`,
`Float.Array.find_mapi`.
(Sima Kinsart, review by Daniel Bünzli and Nicolás Ojeda Bär)
- #11859: Make Stdlib.(@) and List.append tail-recursive and faster.
(Jeremy Yallop, review by Daniel Bünzli, Anil Madhavapeddy, and Bannerets)
- #11856: Rewrite List.concat_map using TRMC, making it faster
as well as tail-recursive.
(Jeremy Yallop, review by Nicolás Ojeda Bär and Gabriel Scherer)
- #11836, #11837: Add `Array.map_inplace`, `Array.mapi_inplace`,
`Float.Array.mapi_inplace` and `Float.Array.mapi_inplace`.
(Léo Andrès, review by Gabriel Scherer, KC Sivaramakrishnan and
Nicolás Ojeda Bär)
- #11410: Add Set.to_list, Map.to_list, Map.of_list, Map.add_to_list,
(Daniel Bünzli, review by Nicolás Ojeda Bär and Gabriel Scherer)
- #11128: Add In_channel.isatty, Out_channel.isatty.
(Nicolás Ojeda Bär, review by Gabriel Scherer and Florian Angeletti)
- #10859: Add `Format.pp_print_iter` and `Format.pp_print_array`.
(Léo Andrès and Daniel Bünzli, review by David Allsopp and Hugo Heuzard)
- #10789: Add `Stack.drop`
(Léo Andrès, review by Gabriel Scherer)
* #10899: Change Stdlib.nan from signaling NaN to quiet NaN.
(Greta Yorsh, review by Xavier Leroy, Guillaume Melquiond and
Gabriel Scherer)
- #10967: Add Filename.temp_dir.
(David Turner, review by Anil Madhavapeddy, Valentin Gatien-Baron, Nicolás
Ojeda Bär, Gabriel Scherer, and Daniel Bünzli)
- #11026, #11667, #11858: Rename the type of the accumulator
of fold functions to 'acc:
fold_left : ('acc -> 'a -> 'acc) -> 'acc -> 'a list -> 'acc
fold_right : ('a -> 'acc -> 'acc) -> 'a list -> 'acc -> 'acc
fold_left_map : ('acc -> 'a -> 'acc * 'b) -> 'acc -> 'a list -> 'acc * 'b list
...
(Valentin Gatien-Baron and Francois Berenger,
review by Gabriel Scherer and Nicolás Ojeda Bär)
- #11246: Add "hash" and "seeded_hash" functions to Bool, Int, Char, Float,
Int32, Int64, and Nativeint.
(Nicolás Ojeda Bär, review by Xavier Leroy and Gabriel Scherer)
- #11354: Hashtbl.find_all is now tail-recursive.
(Fermín Reig, review by Gabriel Scherer)
- #11500: Make Hashtbl.mem non-allocating.
(Simmo Saan, review by Nicolás Ojeda Bär)
- #11362: Rewrite List.map, List.mapi and List.map2 using TRMC, making them
faster as well as tail-recursive.
(Nicolás Ojeda Bär, review by Gabriel Scherer)
- #11412: Add Sys.is_regular_file
(Xavier Leroy, review by Anil Madhavapeddy, Nicolás Ojeda Bär, David Allsopp)
- #11402: Rewrite List.init, List.filter, List.filteri, List.filter_map and
List.of_seq using TRMC instead of an accumulator, making them faster and
halving memory usage while remaining tail-recursive.
(Nicolás Ojeda Bär, review by Xavier Leroy and Gabriel Scherer)
- #11476: Add examples in documentation of Hashtbl, Queue, Atomic, Format
(Simon Cruanes, review by Yotam Barnoy, Gabriel Scherer, Daniel Bünzli,
Ulugbek Abdullaev, and Nicolás Ojeda Bär)
- #11488: Add Mutex.protect for resource-safe critical sections protected by
a mutex.
(Simon Cruanes, review by Gabriel Scherer, Xavier Leroy,
Guillaume Munch-Maccagnoni)
- #11581: Add type equality witness `type (_, _) eq = Equal: ('a, 'a) eq` in a
new module Stdlib.Type.
(Nicolás Ojeda Bär, review by Daniel Bünzli, Jacques Garrigue, Florian
Angeletti, Alain Frisch, Gabriel Scherer, Jeremy Yallop and Xavier Leroy)
- #11322, #11329: serialization functions Random.State.{of,to}_binary_string
between Random.State.t and string
(Gabriel Scherer, report by Yotam Barnoy,
review by Daniel Bünzli, Damien Doligez, Hugo Heuzard and Xavier Leroy)
- #11830: Add Type.Id
(Daniel Bünzli, review by Jeremy Yallop, Gabriel Scherer, Wiktor Kuchta,
Nicolás Ojeda Bär)
- #11843: Add `In_channel.input_lines` and `In_channel.fold_lines`.
(Xavier Leroy, review by Nicolás Ojeda Bär and Wiktor Kuchta).
- #11892: Document the semantic differences of Unix.exec* between Unix and
Windows.
(Boris Yakobowski, review by Daniel Bünzli, Gabriel Scherer and Nicolás Ojeda
Bär)
- #12006, #12064: Add `Marshal.Compression` flag to `Marshal.to_*` functions,
causing marshaled data to be compressed using ZSTD.
(Xavier Leroy, review by Edwin Török and Gabriel Scherer, fix by Damien
Doligez)
### Other libraries:
- #11374: Remove pointer cast to a type with stricter alignment requirements
in Windows implementation of Unix.gettimeofday. Windows implementations of
caml_unix_map_file, caml_unix_lseek and caml_unix_lseek_64 now release the
runtime lock. Windows implementation of caml_unix_lockf modernised and
simplified. Where possible, 64 bit integers are used instead of LARGE_INTEGER
structs.
(David Allsopp, review by Jonah Beckford and Xavier Leroy)
- #11475: Make Unix terminal interface bindings domain-safe
(Olivier Nicole and Xavier Leroy, review by Xavier Leroy)
- #11775: Unix.write on a non-blocking socket under Windows will return normally
if the write blocks after some data has already been written (as otherwise
there is no way of knowing how much data has been written before
blocking). The same behaviour was already present under Unix.
(Nicolás Ojeda Bär, review by David Allsopp)
* #11991: Unix on Windows: map ERROR_TOO_MANY_LINKS to EMLINK.
(Nicolás Ojeda Bär)
- #12067: Document Windows specific meanings of `Unix.process_status`
type
(Samuel Hym, review by David Allsopp)
### Tools:
- #1172: fix ocamlyacc's handling of raw string literals
(Demi Marie Obenour)
- #9290: Add a directive to switch off debugging in toplevel.
This allows to see optimized bytecode with -dlambda.
(Jacques Garrigue, review by Gabriel Scherer)
- #11166: ocamllex: the union of two character sets "cset1 | cset2" can now be
used in any context where a character set is expected.
(Nicolás Ojeda Bär, Martin Jambon, review by Sébastien Hinderer)
- #11718: ocamlyacc: OCaml-style comments are now supported, in addition to
the C-style comments already supported. The syntax is the same as that used
in OCaml code.
(Demi Marie Obenour, review by Damien Doligez)
- #11728: ocamlyacc: generate line directives for %type declarations
(Demi Marie Obenour, review by Damien Doligez)
- #11773: ocamlyacc: Do not allow quoted literals (such as 'a' or "bc")
in a token name or %type declaration. Previously such literals were
accepted by ocamlyacc, but produced malformed OCaml that was rejected
by the compiler.
(Demi Marie Obenour)
- #11774: ocamlyacc: fail if there is an I/O error
(Demi Marie Obenour)
- #10647: Show hints for the "undefined global" error in the toplevel
(Wiktor Kuchta, review by Gabriel Scherer)
- #11973: Add support for postfixed mingw host triplets
(Romain Beauxis)
- #11889, #11978: ocamldoc: handle injectivity annotations and wildcards in type
parameters.
(Florian Angeletti, report by Wiktor Kuchta, review by Jules Aguillon)
* #11993: install only bytecode executables for the `ocamlmklib`, `ocamlcmt`,
`ocamlprof`, `ocamlcp`, `ocamloptp`, and `ocamlmktop` tools, but no
native-code executables. A tool like `ocamlmklib` for example is now
installed directly to `$BINDIR/ocamlmklib`; `ocamlmklib.byte` and
`ocamlmklib.opt` are no longer installed to `$BINDIR`.
(Xavier Leroy, review by Gabriel Scherer)
- #12006: use compressed marshaled format for .cmi, .cmt, .cmti files,
and for debug info in .cmo and .cma files, resulting in major
reduction in size.
(Xavier Leroy, review by Edwin Török and Gabriel Scherer)
### Manual and documentation:
- #12095, #12097: Put the sample code of the user's manual and reference
documentation of the standard library under the CC0 1.0 Universal
(CC0 1.0) Public Domain Dedication license.
- #9430, #11291: Document the general desugaring rules for binding operators.
(Gabriel Scherer, review by Nicolás Ojeda Bär)
- #11481: Fix the type of Unix.umask to Unix.file_perm -> Unix.file_perm
(Favonia, review by Sébastien Hinderer)
- #11676: Fix missing since annotation in the `Sys` and `Format` modules
(Github user Bukolab99, review by Florian Angeletti)
- #12028: Update format documentation to make it clearer that
`pp_print_newline` flushes its newline
(Florian Angeletti, review by Gabriel Scherer)
### Compiler user-interface and warnings:
- #11679: Improve the error message about too many arguments to a function
(Jules Aguillon, review by Gabriel Scherer and Florian Angeletti)
- #10009: Improve the error reported by mismatched struct/sig and =/: in module
and module type bindings.
(Jules Aguillon, review by Gabriel Scherer)
- #11530: Include kinds in kind mismatch error message.
(Leonhard Markert, review by Gabriel Scherer and Florian Angeletti)
- #10818: Preserve integer literal formatting in type hint.
(Leonhard Markert, review by Gabriel Scherer and Florian Angeletti)
- #11338: Turn some partial application warnings into hints.
(Leo White, review by Stephen Dolan)
- #10931: Improve warning 14 (illegal backslash) with a better explanation
of the causes and how to fix it.
(David Allsopp, Florian Angeletti, Lucas De Angelis, Gabriel Scherer,
review by Nicolás Ojeda Bär, Florian Angeletti, David Allsopp and
Gabriel Scherer)
- #10911: Improve the location reported by parenthesized assert expressions
(Fabian Hemmer, review by Gabriel Scherer)
- #1391, #7645, #3922: Add an early error when compiling different
modules with mismatching -for-pack
(Pierre Chambart and Vincent Laviron, review by Mark Shinwell)
- #11297: Report "unclosed" error when "done" is missing in a "do .. done"
construct.
(Nicolás Ojeda Bär)
- #11635, #5461, #10564: Turn warning 31 (Module_linked_twice) into a hard error
(Hugo Heuzard, review by Valentin Gatien-Baron and Gabriel Scherer)
- #11646: Add colors to error message hints.
(Christiana Anthony, review by Florian Angeletti)
- #11653: Add the -no-absname option to ocamlc, ocamlopt and ocamldep.
(Abiola Abdulsalam, review by Sébastien Hinderer and Florian Angeletti)
- #11696: Add the -no-g option to ocamlc and ocamlopt.
(Abiola Abdulsalam, review by Sébastien Hinderer, Nicolás Ojeda Bär and
Florian Angeletti)
- #11722: clearer error messages on non-well-founded type definitions
(Gabriel Scherer, review by Jacques Garrigue)
- #11819: make the `native_compiler` and `native_dynlink` configuration
variables available through ocamlc -config.
(Sébastien Hinderer, review by Gabriel Scherer and David Allsopp)
- #11235, #11864: usage warnings for constructors and fields can now be disabled
on field-by-field or constructor-by-constructor basis
(Florian Angeletti, review by Gabriel Scherer)
- #8602, #11863: Add -stop-after lambda flag option
(Douglas Smith and Dmitrii Kosarev, review by Gabriel Scherer)
- #11888: Improve the error message when type variables cannot be deduced from
the type parameters.
(Stefan Muenzel, review by Florian Angeletti and Gabriel Scherer)
- #11910: Simplify naming convention for shadowed or ephemeral identifiers in
error messages (eg: `Illegal shadowing of included type t/2 by t`)
(Florian Angeletti, review by Jules Aguillon)
- #12024: insert a blank line between separate compiler messages
(Gabriel Scherer, review by Florian Angeletti, report by David Wong)
- #12088, #9265, #11949: ocamldebug: fix confusing repeating behavior
on blank lines within source scripts
(Damien Doligez, review by Gabriel Scherer, report by Gaëtan Gilbert)
- #12107: use aliases to mark weak row variables: `_[< ... ]`, `< _..>`, `_#ct`
are now rendered as `[< ...] as '_weak1`, `< .. > as '_weak1`,
and `#ct as '_weak1`.
(Florian Angeletti, suggestion by Stefan Muenzel, review by Gabriel Scherer)
### Internal/compiler-libs changes:
- #10512: explain the compilation strategy for switches on constructors
(Gabriel Scherer, review by Vincent Laviron)
- #11990: Improve comments and macros around frame descriptors.
(Nick Barnes, review by Gabriel Scherer)
- #11847, #11849, #11851, #11898: small refactorings in the type checker
(Gabriel Scherer, review by Nicolás Ojeda Bär)
- #11027: Separate typing counter-examples from type_pat into retype_pat;
type_pat is no longer in CPS.
(Jacques Garrigue and Takafumi Saikawa, review by Gabriel Scherer)
- #11018, #11869: Clean up Types.Variance, adding a description of
the lattice used, and defining explicitly composition.
(Jacques Garrigue, review by Gabriel Scherer and Jeremy Yallop)
- #11286, #11515: disambiguate identifiers by using how recently they have
been bound in the current environment
(Florian Angeletti, review by Gabriel Scherer)
- #11364: Allow `make -C testsuite promote` to take `TEST` and `LIST` variables
(Antal Spector-Zabusky, review by Gabriel Scherer and David Allsopp)
- #11446: document switch compilation (lambda/switch.ml)
(Gabriel Scherer, review by Luc Maranget and Vincent Laviron)
- #11536: Introduce wrapper functions for level management
([Ctype.with_level], etc) and for type variable scoping
([Typetexp.with_local_type_variable_scope]).
The older API ([Ctype.(begin_def,end_def)], [Typetexp.(narrow,widen)], etc.)
is now removed.
(Jacques Garrigue and Takafumi Saikawa, review by Gabriel Scherer)
- #11568: Encode inline record types in Path.t
(Leo White and Hyunggyu Jang, review by Gabriel Scherer)
- #11569: Remove hash type encoding
(Hyunggyu Jang, review by Gabriel Scherer and Florian Angeletti)
- #11601, #11612, #11628, #11613, #11623, #12120 : Clean up some
global state handling in emitcode, bytepackager, bytegen,
bytesections, spill.
(Hugo Heuzard, Stefan Muenzel, review by Vincent Laviron, Gabriel Scherer
and Nathanaëlle Courant)
- #11627: use return values instead of globals for linear scan intervals
(Stefan Muenzel, review by Nicolás Ojeda Bär)
- #11634: Dll.open_dll now properly handle opening for execution while already
opened for checking
(Hugo Heuzard, review by Nicolás Ojeda Bär)
- #11745: Debugger and toplevels: embed printer types rather than
reading their representations from topdirs.cmi at runtime.
(Sébastien Hinderer, review by Florian Angeletti, Nicolás Ojeda Bär and
Gabriel Scherer)
- #11615: remove global variables form asmcomp/linearize.ml
(Stefan Muenzel, review by Nicolás Ojeda Bär
- #10856: Add location, attribute(s) visitors to Tast_mapper/Tast_iterator
(Yan Dong, review by Nicolás Ojeda Bär and Gabriel Scherer)
- #11763, #11759, #11861: Enable stricter C compilation warnings, use
strict prototypes on primitives.
(Antonin Décimo, review by Xavier Leroy, David Allsopp and Sébastien
Hinderer)
- #11933: Use the correct machtype when reading the code pointer from closures
(Nathanaëlle Courant, review by Gabriel Scherer and Vincent Laviron)
- #11972: refactor runtime/frame_descriptors.c
in preparation for quadratic-time fix
(Gabriel Scherer, review by Enguerrand Decorne)
- #11997: translate structured constants into their Obj.t representation
at compile time rather than link time. Changes the way dumpobj prints
these constants because their representaiton becomes untyped.
(Sébastien Hinderer, review by Xavier Leroy, Nicolás Ojeda Bär and
Hugo Heuzard)
- #12012: move calls to Typetexp.TyVarEnv.reset inside with_local_level etc.
(Jacques Garrigue and Takafumi Saikawa, review by Gabriel Scherer)
- #12034: a logarithmic algorithm to find the next free variable
(Gabriel Scherer, review by Stefan Muenzel)
- #12092: remove Lev_module_definition from lambda
(Nick Roberts, review by Gabriel Scherer)
- #12118: stop storing names of predefined exceptions in the
cu_required_globals field of compilation unit descriptors.
(Sébastien Hinderer, review by Vincent Laviron)
- #12119: mirror type constraints on value binding in the parsetree:
the constraint `typ` in `let pat : typ = exp` is now directly stored
in the value binding node in the parsetree.
(Florian Angeletti, review by Richard Eisenberg)
- #12125: Add Misc.print_see_manual and modify [@manual_ref] to accept
lists for simpler printing of manual references
(Stefan Muenzel, review by Florian Angeletti)
### Build system:
- #11590: Allow installing to a destination path containing spaces.
(Élie Brami, review by Sébastien Hinderer and David Allsopp)
- #11243, #11248, #11268, #11420, #11675: merge the sub-makefiles into
the root Makefile.
(Sébastien Hinderer, review by David Allsopp and Florian Angeletti)
- #11828: Compile otherlibs/ C stubs in two version for native and bytecode
(Olivier Nicole, review by Sébastien Hinderer and Xavier Leroy)
- #11844: Reduce verbosity of `make` logs by printing program invocations in
shorthand (eg `OCAMLC foo.cmo`). Setting `V=1` recovers the old style (with
full command-lines).
(Xavier Leroy, Nicolás Ojeda Bär, review by Sébastien Hinderer)
- #11981: Reduce size of OCaml installations by removing debugging information
from installed bytecode executables. It is no longer possible to
run ocamldebug over these installed bytecode executables, nor to get
exception backtraces for them.
(Xavier Leroy, review by David Allsopp, report by Fabrice Le Fessant)
### Bug fixes:
- #12017: Re-register finaliser only after calling user alarm in Gc.create_alarm
(Fabrice Buoro, report by Sam Goldman, review by Guillaume Munch-Maccagnoni)
- #11887, #11893: Code duplication in pattern-matching compilation
(Vincent Laviron, report par Greta Yorsh, review by Luc Maranget and
Gabriel Scherer)
- #10664, #11600: Unsoundness in the typing of polymorphic methods
involving polymorphic variants
(Jacques Garrigue, report by Mike Shulman, review by Gabriel Scherer)
- #11302, #11412: `ocamlc` and `ocamlopt` should not remove generated files
when they are not regular files.
(Xavier Leroy, report by Thierry Martinez, review by
Anil Madhavapeddy, Nicolás Ojeda Bär, David Allsopp)
- #10348, #10560, #11561: Expand GADT equations lazily during unification to
avoid ambiguity
(Jacques Garrigue, review by Leo White)
- #11436: Fix wrong stack backtrace for out-of-bound exceptions raised
by leaf functions.
(Tom Kelly and Xavier Leroy, review by Mark Shinwell)
- #11450, #12018: Fix erroneous functor error messages that were too eager to
cast `struct end` functor arguments as unit modules in `F(struct end)`.
(Florian Angetti, review by Gabriel Scherer)
- #11643: Add missing test declaration to float_compare test, so that it will
run.
(Stefan Muenzel, review by David Allsopp)
- #11630: Use correct location when reporting record labels with non-existent
paths.
(Nicolás Ojeda Bär, report by Jason Gross, review by Gabriel Scherer)
- #11727: Ensure push_defaults can push past module patterns, fixing an
currying optimisation accidentally disabled by #10340.
(Stephen Dolan, review by Gabriel Scherer)
- #11732: Ensure that types from packed modules are always generalised
(Stephen Dolan and Leo White, review by Jacques Garrigue)
- #11771: Use a more relaxed mode for unification in Ctype.subst
(Leo White, review by Jacques Garrigue and Gabriel Scherer)
- #11776: Extend environment with functor parameters in `strengthen_lazy`.
(Chris Casinghino and Luke Maurer, review by Gabriel Scherer)
- #11803, #11808: on x86, the destination of an integer comparison must be
a register, it cannot be a stack slot.
(Vincent Laviron, review by Xavier Leroy, report by
Emilio Jesús Gallego Arias)
- #11809: Protect Parmatch.pats_of_type from missing cmis
(Jacques Garrigue, review by Stephen Dolan and Gabriel Scherer)
- #11824: Fix a crash when calling `ocamlrun -b`
(Florian Angeletti, review by Sébastien Hinderer)
- #11815: Marshalling continuations raises invalid argument exception.
(Jérôme Vouillon, review by Nicolás Ojeda Bär, Stephen Dolan and
Hugo Heuzard)
- #11850: When stopping before the `emit` phase (using `-stop-after`), an empty
temporary assembly file is no longer left in the file system.
(Nicolás Ojeda Bär, review by Gabriel Scherer and Xavier Leroy)
- #11866: Fix the result of `caml_read_directory()` on non-existent paths.
(Andrei Paskevich and Charlène Gros, review by David Allsopp and
Nicolás Ojeda Bär)
- #11879: Bugfix for Ctype.nondep_type
(Stephen Dolan, review by Gabriel Scherer)
- #12004: Don't ignore function attributes on lambdas with locally abstract
types.
(Chris Casinghino, review by Gabriel Scherer)
- #12046: Flush stderr when tracing the parser
(Hugo Heuzard, review by David Allsopp and Nicolás Ojeda Bär)
- #12061, #12063: don't add inconsistent equalities when computing
high-level error messages for functor applications and inclusions.
(Florian Angeletti, review by Gabriel Scherer)
- #12075: auto-detect whether `ar` support @FILE arguments at
configure-time to avoid using this feature with toolchains
that do not support it (eg FreeBSD/Darwin).
(Nicolás Ojeda Bär, review by Xavier Leroy, David Allsop, Javier
Chávarri, Anil Madhavapeddy)
- #12103, 12104: fix a concurrency memory-safety bug in Buffer
(Gabriel Scherer, review by Florian Angeletti, report by Samuel Hym)
- #12112: Fix caml_callback{2,3}_exn when used with effect handlers.
(Lucas Pluvinage, review by Gabriel Scherer, David Allsopp and Xavier Leroy)
OCaml 5.0.0 (15 December 2022)
------------------------------
- #10831: Multicore OCaml
(Enguerrand Decorne, Stephen Dolan, Tom Kelly, Sadiq Jaffer,
Anil Madhavapeddy, Sudha Parimala, KC Sivaramakrishnan,
Leo White, the Tarides multicore team,
review by Florian Angeletti, Damien Doligez, Xavier Leroy,
Guillaume Munch-Maccagnoni, Olivier Nicole, Nicolás Ojeda Bär,
Gabriel Scherer, the OCaml core development team, and many
other valued reviewers.)
### Language features:
### Runtime system:
- #11400: Runtime events counters fixes
Fixes mismatch between OCaml and C APIs, removes events from 4.x that
are not present in the 5.0 GC and adds some missing probes.
(Sadiq Jaffer, review by Gabriel Scherer, Florian Angeletti)
- #11368: Runtime events buffer size OCAMLRUNPARAMS fix
The runtime events buffer size can now be set via the 'e' OCAMLRUNPARAM.
This is previously mistakenly enabled/disabled tracing instead.
(Sadiq Jaffer, review by KC Sivaramakrishnan, David Allsopp, Damien Doligez)
- #11308: Add environment variable to preserve runtime_events after exit
If the environment variable OCAML_RUNTIME_EVENTS_PRESERVE exists then the
runtime will not remove the runtime events ring buffers at exit. This
makes tracing very short running programs more reliable.
(Sadiq Jaffer, review by KC Sivaramakrishnan)
- #10964: Ring-buffer based runtime tracing (runtime_events)
Runtime_events is a very low overhead runtime tracing system designed for
continuous monitoring of OCaml applications.
(Sadiq Jaffer, review by Anil Madhavapeddy, Enguerrand Decorne,
Richard Warburton, Gabriel Scherer, Sabine Schmaltz, Florian Angeletti,
Patrick Ferris, Tom Kelly)
* #10723: do not use `-flat-namespace` linking for macOS.
(Carlo Cabrera, review by Damien Doligez)
* #10863, #10933: Remove support for old, unprefixed C runtime function names
such as `alloc`. The new names prefixed with `caml_` must be used instead,
such as `caml_alloc`. Consequently, it is no longer needed to define
`CAML_NAME_SPACE` to avoid bringing unprefixed names into scope: this is now
the default behavior.
(Nicolás Ojeda Bär, review by Xavier Leroy)
- #10902: Do not register empty code fragments in natdynlink.
(David Allsopp, review by Xavier Leroy and Damien Doligez)
- #10965: `caml_fatal_error_hook`, GC timing hooks, and
`caml_scan_roots_hook` are now atomic variables. Restore GC timing
hooks in multicore.
(Guillaume Munch-Maccagnoni, review by Enguerrand Decorne, Xavier
Leroy, Gabriel Scherer, and KC Sivaramakrishnan)
- #11209: Add a public and thread-safe timing hook running at domain
termination, after this domain has stopped running any OCaml code:
`caml_domain_terminated_hook`. This can be useful for implementing
domain-local state in C.
(Guillaume Munch-Maccagnoni, review by Xavier Leroy and Gabriel
Scherer)
- #10875, #11731: Add option to allocate fiber stacks and sigaltstacks with
mmap(MAP_STACK) instead of malloc. This is exposed via a configure
--enable-mmap-map-stack option, and is enabled by default on OpenBSD where
it is mandatory.
(Anil Madhavapeddy, review by Gabriel Scherer, Tom Kelly,
Michael Hendricks and KC Sivaramakrishnan).
- #10950: Do not use mmap to allocate Caml_state.
In order to reduce virtual memory usage, we dynamically allocate
the domain_state structure.
(Enguerrand Decorne, KC Sivaramakrishnan and Tom Kelly,
review by Anil Madhavapeddy and Gabriel Scherer)
- #11010: Use strerror_r for reentrant error string conversion.
(Anil Madhavapeddy and Xavier Leroy, review by same and Edwin Török)
- #11002, #11066, #11086: Do not use Begin_roots/End_roots macros in
the runtime system. Also fix a missing root registration in the
implementation of Unix.write on Windows.
(Nicolás Ojeda Bär, Daniel Bünzli and Antonin Décimo,
review by Xavier Leroy and David Allsopp)
- #11022: Track GC work for all managed bigarray allocations
(Stephen Dolan, report by Andrew Hunter, review by Damien Doligez)
- #10802: Use 4.12 value macros and helpers in C code
(Antonin Décimo, review by Gabriel Scherer)
- #11105: Fix handling of fiber stack cache with multiple domains
(Jon Ludlam, KC Sivaramakrishnan and Tom Kelly)
- #11054: Respect user provided maximum stack space
Make sure the stack we initially request is sized accordingly to
the user provided settings. tmc/stack_space is also updated by
this PR in order to account for this change.
(Enguerrand Decorne, report by Jon Ludlam,
review by Tom Kelly, KC Sivaramakrishnan and Gabriel Scherer)
- #11238: Increase the default limit for the stack size to 128 Mi words,
i.e. 1 Gib for 64-bit platforms and 512 Mib for 32-bit platforms.
(Xavier Leroy, review by Sébastien Hinderer)
- #11284: Use compression of entries scheme when pruning mark stack.
Can decrease memory usage for some workloads, otherwise should be
unobservable.
(Tom Kelly, review by Sabine Schmaltz, Sadiq Jaffer and Damien Doligez)
* #11295: An ISO C 2011 compliant compiler, including full support for atomic
types, is now required to build the OCaml runtime system.
(Xavier Leroy, review by David Allsopp and Sébastien Hinderer)
- #10915, #11039, #11057, #11095, #11190: Implement quality treatment for
asynchronous actions in multicore. Reimplement the old behaviour of
`caml_process_pending*` for multicore.
(Guillaume Munch-Maccagnoni, review by Sadiq Jaffer and Gabriel Scherer)
- #11303: Ensure that GC is not invoked from bounds check failures
(Stephen Dolan, review by Sadiq Jaffer and Xavier Leroy)
- #11304: Fix data race on Windows file descriptors
(Olivier Nicole and Xavier Leroy, review by Xavier Leroy, David Allsopp,
and Sadiq Jaffer)
* #11337: pass 'flags' metadata to root scanners, to optimize stack
scanning in the bytecode interpreter.
Changes the interface of user-provided root-scanning hooks.
(Gabriel Scherer, review by Xavier Leroy,
Guillaume Munch-Maccagnoni, Sadiq Jaffer and Tom Kelly)
- #11144: Restore frame-pointers support for amd64
(Fabrice Buoro, review by Frederic Bour and KC Sivaramakrishnan)
* #11255: in the C interface, `&Field(v, i)` now has type `volatile value *`
instead of `value *` in OCaml 4. This makes the memory model
for mixed OCaml/C code better defined, but can cause warnings or type
errors in user C code.
(KC Sivaramakrishnan, review by Xavier Leroy, Gabriel Scherer and
Guillaume Munch-Maccagnoni, additional discussions with Stephen
Dolan and Luc Maranget)
- #5299, #4787, #11138, #11272, #11506: To help debugging, `Caml_state`
now dynamically checks that the domain lock is held, and fails
otherwise (with a fatal error at most entry points of the C API, or
systematically in debug mode). A new variable `Caml_state_opt` is
introduced, and is `NULL` when the domain lock is not held. This
allows to test from C code if the current thread holds the lock of
its domain.
(Guillaume Munch-Maccagnoni, review by Florian Angeletti, Damien
Doligez, Sadiq Jaffer, Xavier Leroy, and Gabriel Scherer)
- #11223: The serialization format of custom blocks changed in 4.08,
but the deserializer would still support the pre-4.08 format. OCaml
5.x removed support for this old format; provide a clear error message
in this case.
(Hugo Heuzard, review by Gabriel Scherer)
- #11504, #11522: Use static allocation in `caml_make_float_vect` in
no-flat-float-array mode, it's more efficient and avoids a a race condition
(Xavier Leroy, report by Guillaume Munch-Maccagnoni, review by David Allsopp)
- #11652: Fix benign off-by-one error in Windows implementation of caml_mem_map.
(David Allsopp, review by Gabriel Scherer)
- #11669, #11704: Fix construction of Effect.Unhandled exceptions in the
bytecode interpreter.
(David Allsopp and Xavier Leroy, report by Samuel Hym, review by Xavier Leroy
and Gabriel Scherer)
### Code generation and optimizations:
- #10972: ARM64 multicore support: OCaml & C stack separation;
dynamic stack size checks; fiber and effects support.
(Tom Kelly and Xavier Leroy, review by KC Sivaramakrishnan, Xavier Leroy
Guillaume Munch-Maccagnoni, Eduardo Rafael, Stephen Dolan and
Gabriel Scherer)
* #10845 Emit frametable size on amd64 BSD (OpenBSD, FreeBSD, NetBSD) systems
(emitted for Linux in #8805)
(Hannes Mehnert, review by Nicolás Ojeda Bär)
- #11134: Optimise 'include struct' in more cases
(Stephen Dolan, review by Leo White and Vincent Laviron)
### Standard library:
- #10742: Use LXM as the pseudo-random number generator for module Random.
Add `Random.State.split` and `Random.split` to "split" a PRNG off
another PRNG.
(Xavier Leroy, review by Gabriel Scherer and Hugo Heuzard)
* #10867, #11345: Remove deprecated values: Array.create, Array.make_float,
Array.create_matrix, Bytes.uppercase, Bytes.lowercase, Bytes.capitalize,
Bytes.uncapitalize, Char.lowercase, Char.uppercase, Filename.temp_dir_name,
Int32.format, Int64.format, Nativeint.format, Format.bprintf, Format.kprintf,
Format.set_all_formatter_output_functions,
Format.get_all_formatter_output_functions,
Format.pp_set_all_formatter_output_functions,
Format.pp_get_all_formatter_output_functions, Format.pp_open_tag,
Format.pp_close_tag, Format.open_tag, Format.close_tag,
Format.formatter_tag_functions, Format.pp_set_formatter_tag_functions,
Format.pp_get_formatter_tag_functions, Format.set_formatter_tag_functions,
Format.get_formatter_tag_functions, Gc (mutability of the fields of type
Gc.control), Lazy.lazy_from_fun, Lazy.lazy_from_val, Lazy.lazy_is_val,
Obj.set_tag, Obj.truncate, Obj.final_tag, Obj.extension_constructor,
Obj.extension_name, Obj.extension_id, Scanf.stdib, Scanf.fscanf,
Scanf.kfscanf, Stdlib.( & ), Stdlib.( or ), String.set, String.copy,
String.fill, String.unsafe_set, String.unsafe_fill, String.uppercase,
String.lowercase, String.capitalize, String.uncapitalize, Thread.kill,
Thread.wait_write, Thread.wait_read, the whole ThreadUnix module, the
infix operator (.[]<-).
(Nicolás Ojeda Bär, review by Damien Doligez)
* #10896: Remove Stream, Genlex and Pervasives. Also remove legacy standalone
bigarray library (the Bigarray module is now part of the standard library).
(Nicolás Ojeda Bär, review by Kate Deplaix and Anil Madhavapeddy)
- #10921: Use getentropy, when available, to seed the generator during
`Random.self_init`
(Michael Hendricks, review by Gabriel Scherer, Xavier Leroy, and
Anil Madhavapeddy)
* #10924: Add deprecated attribute to Printexc.catch, Printf.kprintf and
Unix.SO_ERROR.
(Nicolás Ojeda Bär, review by Damien Doligez)
- #10986: Add Scanf.sscanf_opt, Scanf.bscanf_opt and Scanf.scanf_opt.
(Nicolás Ojeda Bär, review by Florian Angeletti and Gabriel Scherer)
* #11157: Rename "hash" in the "Hashtbl.SeededHashedType" signature to
"seeded_hash". This allows defining both seeded and unseeded hash functions in
the same module.
(Nicolás Ojeda Bär, review by Gabriel Scherer and Xavier Leroy)
- #8878: Add String.hash and String.seeded_hash.
(Tom Kelly, review by Alain Frisch and Nicolás Ojeda Bär)
- #11279, #11585, #11742: ensure that the unsafe Buffer code
remains memory-safe in concurrent settings.
Unsychronized access to Buffer is a programming error and may
result in wrong behavior, but it should preserve memory-safety.
(Florian Angeletti and Gabriel Scherer, review by Gabriel Scherer
and Vincent Laviron, report by David Allsopp)
### Other libraries:
* #9071, #9100, #10935: Reimplement `Thread.exit()` as raising the
exception `Thread.Exit`, and mark `Thread.exit` as deprecated.
The new implementation changes the behavior compared with
the OCaml 4 implementation. For example, the new implementation
causes `Fun.finally` finalizers to be run and catch-all exception
handlers to prevent termination.
(Jacques-Henri Jourdan and Xavier Leroy, review by Damien Doligez,
Guillaume Munch-Maccagnoni, Gabriel Scherer, and Enguerrand Decorne)
- #11034: Dynlink library, add a global lock to make dynlinking
thread-safe.
(Florian Angeletti, review by Gabriel Scherer)
- #11087: deprecate Thread.wait_timed_read, Thread.wait_timed_write,
Thread.select, Thread.wait_pid. The same functionality is available in the
Unix module.
(Nicolás Ojeda Bär, review by Anil Madhavapeddy)
- #11309, #11424, #11427, #11545: Add Domain.recommended_domain_count.
(Christiano Haesbaert, Konstantin Belousov, review by David Allsopp,
KC Sivaramakrishnan, Gabriel Scherer, Nicolas Ojeda Bar)
- #11461, #11466: Fix gethostbyaddr for IPv6 arguments and make it domain-safe
(Olivier Nicole, Nicolás Ojeda Bär, David Allsopp and Xavier Leroy,
review by the same)
- #11479: Make Unix.symlink domain-safe on Windows
(Olivier Nicole, review by Xavier Leroy and David Allsopp)
### Tools:
* #11004: Litmus tests for checking the implementation of the
memory model.
(Luc Maranget, review by Gabriel Scherer and Xavier Leroy)
- #11024: Handle alerts in ocamldoc.
The alert `[@@alert deprecated]` is handled specifically and it's no longer
needed to duplicate the deprecated annotation (the alert for the compiler and
the tag for the documentation). Every other alerts also appear in the
documentation.
(Jules Aguillon, review by Florian Angeletti)
- #11065: Port the bytecode debugger to 5.0, adding support for effect handlers.
(Damien Doligez and @fabbing, review by @fabbing and Xavier Leroy)
- #11079: Add the -nobanners option to dumpobj.
(Sébastien Hinderer, review by Gabriel Scherer and Vincent Laviron)
- #11100: Fix ocamltest to make sure failed tests are not counted as
"unexpected error".
(Damien Doligez, review by Sébastien Hinderer)
- #11245: Merge the common code of ocamlcp and ocamloptp into a single module.