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Working version
---------------
(Changes that can break existing programs are marked with a "*")
### Language features:
- #13340: Array literal syntax can now be used to denote values of type `'a
array` and `floatarray`, both in expressions and patterns. The compiler
disambiguates each case by using contextual type information (assuming `'a
array` by default).
(Nicolás Ojeda Bär, review by Richard Eisenberg, Jeremy Yallop, Jacques
Garrigue, and Gabriel Scherer)
- #13097: Immutable arrays
(Antal Spector-Zabusky and Olivier Nicole, review by Gabriel Scherer,
Jeremy Yallop and Vincent Laviron)
- #13498: Tuple fields are now optionally labeled.
(Ryan Tjoa and Chris Casinghino, review by Gabriel Scherer, Chris Casinghino,
and Leo White)
### Runtime system:
- #13819: Fix field initialisation bug in runtime events subsystem.
(Nick Barnes, review by Gabriel Scherer).
- #13785: Add `Runtime_events.Timestamp.get_current`.
(Simon Cruanes)
- #13774: Fix for inaccurate live blocks/words stats in compaction.
(Sadiq Jaffer, report by KC Sivaramakrishnan and Jan Midtgaard, review by
Gabriel Scherer)
- #13773: Ensure that shared pool owners are correctly set on pool adoption.
(Stephen Dolan, review by Sadiq Jaffer and Gabriel Scherer)
* #11449, #13497: Add caml_stat_char_array_{to,of}_os functions allowing
conversion of string data which may contain NUL characters. Correct
implementation of caml_stat_strdup_to_utf16 to raise Out_of_memory instead of
returning of NULL (the behaviour of caml_stat_strdup_to_os was inconsistent
between Unix/Windows).
(David Allsopp, review by Nick Barnes, Antonin Décimo and Miod Vallat)
- #13352: Concurrency refactors and cleanups.
(Antonin Décimo, review by Gabriel Scherer, David Allsopp, and Miod Vallat)
- #13437: Stop using GetProcAddress to load functions that were not
available in older, now unsupported Windows versions.
(Antonin Décimo, review by Nicolás Ojeda Bär and David Allsopp)
- #13470: Constify some function parameters, flags tables, and some
pointers in C code (take 3).
(Antonin Décimo, review by Stephen Dolan and Miod Vallat)
- #13492: Parse the CAML_LD_LIBRARY_PATH environment variable for the
shared_libs_path item in `ocamlrun -config` in addition to displaying the
entries found in ld.conf.
(David Allsopp, review by Stephen Dolan)
- #13496: Add missing .type and .size directives to main frametable to silence
warnings from the linker when using libasmrun_shared on amd64 and power. The
other backends already carried these directives.
(David Allsopp, review by Tim McGilchrist and Miod Vallat)
- #13500: Add frame pointers support for ARM64 on Linux and macOS.
(Tim McGilchrist, review by KC Sivaramakrishnan, Fabrice Buoro
and Miod Vallat)
- #12964: Reintroduce "memory cleanup upon exit" mode. The cleanup will
however be incomplete if not all domains have been joined when the main
domain terminates.
(Miod Vallat, review by KC Sivaramakrishnan, feedback from Nick Barnes
and Gabriel Scherer)
- #13354: Use C99 flexible array member syntax everywhere.
(Antonin Décimo, review by Miod Vallat, Gabriel Scherer, and Xavier Leroy)
- #11865, #13584: Fix a deadlock triggered by deleting C roots from C finalisers
(Stephen Dolan, report by Timothy Bourke, review by Mark Shinwell and Damien
Doligez)
- #13613: Functions from caml/skiplist.h and caml/lf_skiplist.h no longer raise
Out_of_memory exceptions that the runtime could not handle.
(Guillaume Munch-Maccagnoni, review by Stephen Dolan)
- #13575, #13635: Maintain OCaml frame pointers correctly even when using
C libraries that do not support them.
(Stephen Dolan and David Allsopp, report by Thomas Leonard, review by Tim
McGilchrist and Fabrice Buoro)
- #13701: optimize `caml_continuation_use` based on #12735
(Hugo Heuzard, review by KC Sivaramakrishnan)
- #13227, #13714: Review of locking in the multicore runtime. Fix
deadlocks in runtime events and potential deadlocks with named
values.
(Guillaume Munch-Maccagnoni, review by Gabriel Scherer, tests by
Jan Midtgaard)
- #13736: Fix major GC pacing bug triggered by synchronous collections.
(Nick Barnes, review by Damien Doligez and Tim McGilchrist)
- #13582: Enable software prefetching support for ARM64, s390x, PPC64 and RiscV.
Used during GC marking and sweeping to speed up both operations by
prefetching data.
(Tim McGilchrist, review by Nick Barnes, Antonin Décimo,
Stephen Dolan and Miod Vallat)
- #13827: Avoid re-marking ephemerons with trivial data.
(Stephen Dolan, review by Nick Barnes and Josh Berdine, benchmarking by
Nicolás Ojeda Bär)
### Code generation and optimizations:
* #13050: Use '$' instead of '.' to separate module names in symbol names.
This changes mangling of OCaml identifiers from
`camlModule.name_NNN` to `camlModule$name_NNN`. Additionally it
changes the encoding of special characters from $xx (two hex digits)
to $$xx (two dollar signs followed by two hex digits).
Mangled names are now consistent across all platforms.
(Tim McGilchrist, with contributions from Xavier Leroy,
reviewed by Xavier Leroy, Miod Vallat, Gabriel Scherer,
Nick Barnes and Hugo Heuzard)
- #13565: less tagging in switches compiled to affine transformations
by ocamlopt.
(Gabriel Scherer and Clément Allain, review by Vincent Laviron,
report by Vesa Karvonen)
- #13672 Avoid register stall on conversion instructions on amd64.
(Pierre Chambart, review by Gabriel Scherer and Xavier Leroy,
report by Patrick Nicodemus)
- #13667: (originally #11162) Fix instr_size computation on arm64.
(Stephen Dolan and Tim McGilchrist, review by Xavier Leroy
and David Allsopp)
- #13758: Propagate more value kinds in Flambda to allow more unboxing
(Vincent Laviron, review by Pierre Chambart)
- #13759: Propagate more type information from clambda to cmm.
(Pierre Chambart, review by Gabriel Scherer)
- #13735: Follow the behaviour of the C compiler to decide whether to emit the
`.size` and `.type` directives and the `.note.GNU-stack` section
(Samuel Hym, review by Miod Vallat, Antonin Décimo and Gabriel Scherer)
- #13807: Allow unaligned memory accesses on ARM64. (Matthew Else, review by
Xavier Leroy)
### Standard library:
- #13885: Add Dynarray.{exists2, for_all2}.
(T. Kinsart, review by Daniel Bünzli, Gabriel Scherer, and Nicolás Ojeda Bär)
- #13836: Add [Float.]Array.{equal,compare}.
(Daniel Bünzli, review by Nicolás Ojeda Bär and Gabriel Scherer)
- #13796: Add Uchar.utf_8_decode_length_of_byte and
Uchar.max_utf_8_decode_length.
(Daniel Bünzli, review by Nicolás Ojeda Bär and Florian Angeletti)
- #12871: Add the Pqueue module to the stdlib. It implements priority queues.
(Jean-Christophe Filliâtre, review by Daniel Bünzli, Léo Andrès and
Gabriel Scherer)
- #13760: Add String.{edit_distance,spellcheck}
(Daniel Bünzli, review by wikku, Nicolás Ojeda Bär, Gabriel Scherer and
Florian Angeletti)
- #13768: Add Either.get_left and Either.get_right
(T. Kinsart, review by Nicolás Ojeda Bär and Florian Angeletti)
- #13570, #13794: Format, add an out_width function to Format device for
approximating unicode width.
(Florian Angeletti, review by Nicolás Ojeda Bär, Daniel Bünzli,
and Gabriel Scherer)
- #13753 #13755: Add Stdlib.Repr
(Kate Deplaix, Thomas Blanc and Léo Andrès, review by Gabriel Scherer,
Florian Angeletti, Nicolás Ojeda Bär, Daniel Bünzli and Jeremy Yallop)
- #13731: Add Either.retract
(Daniel Bünzli, review by Nicolás Ojeda Bär and David Allsopp)
- #13729: Add Seq.filteri
(T. Kinsart, review by Nicolás Ojeda Bär and Daniel Bünzli)
- #13721: Add Result.retract
(Daniel Bünzli, review by Gabriel Scherer, Nicolás Ojeda Bär and
David Allsopp)
- #13695: Add Stdlib.Char.Ascii
(Daniel Bünzli, review by by Nicolás Ojeda Bär and Jeremy Yallop)
- #13310: Add Stdlib.Pair
(Victoire Noizet, review by Nicolás Ojeda Bär, Daniel Bünzli, Xavier Van de
Woestyne, Jeremy Yallop and Florian Angeletti)
- #13662: Add eager boolean operations Bool.logand, Bool.logor, Bool.logxor
(Jeremy Yallop, review by Nicolás Ojeda Bär)
- #13463, #13572: Avoid Queue.empty to be raised by Format when used
concurrently. prefer undefined behavior to uncaught exception.
(Chritophe Raffalli, review by Gabriel Scherer and Daniel Bünzli)
- #13620: Avoid copying the string in String.concat, String.sub and
String.split_on_char when the full string is returned.
(Christophe Raffalli, review by Nicolás Ojeda Bär and Gabriel Scherer and
Hugo Heuzard)
- #13727: Reimplement Sys.getenv_opt not to use exceptions internally, meaning
that the current backtrace is preserved when Sys.getenv_opt returns None.
(David Allsopp, review by Nicolás Ojeda Bär, Josh Berdine and Gabriel Scherer)
- #13737: Avoid closure allocations in Weak.Make.add when resizing the
table
(Vincent Laviron, review by Gabriel Scherer and Daniel Bünzli)
- #13740: Improve performance of Weak.find_aux
(Josh Berdine, review by Gabriel Scherer)
- #13782: Improve performance and type safety of Type.Id by using
[%extension_constructor] instead of Obj.Extension_constructor.of_val.
(Basile Clément, review by Vincent Laviron and Nicolás Ojeda Bär)
- #13589: Expose Sys.io_buffer_size, the size of internal buffers used by the
runtime system and the `unix` library.
(Yves Ndiaye and Nicolás Ojeda Bär, review by Daniel Bünzli and Nicolás Ojeda
Bär)
- #13569: add a `Format.format_text` which adds break hints to format literals.
(Florian Angeletti, review by Nicolás Ojeda Bär, Daniel Bünzli,
and Gabriel Scherer)
- #13578: On Windows, use the OS CSPRNG to seed the Stdlib.Random generator.
(Antonin Décimo, review by Miod Vallat, Nicolás Ojeda Bär, and Xavier Leroy)
- #13859: Fix Weak.get_copy not darkening custom blocks
(Josh Berdine, review by Stephen Dolan)
### Other libraries:
* #13376: Allow Dynlink.loadfile_private to load bytecode libraries with
internal dependencies
(Vincent Laviron, report by Stéphane Glondu, review by Nicolás Ojeda Bär
and Xavier Leroy)
- #13429: add `Unix.sigwait`, a binding to the `sigwait` system call;
implement `Thread.wait_signal` using `Unix.sigwait`, and
`Thread.sigmask` using `Unix.sigprocmask`.
(Xavier Leroy, review by Antonin Décimo, Gabriel Scherer, Miod Vallat)
- #13442, #13452: Fix Unix.getgroups for users belonging to more than 32 groups
when using musl
(Kate Deplaix, review by Gabriel Scherer, Antonin Décimo, Anil Madhavapeddy)
* #13435: On Windows, use system calls for `Filename.get_temp_dir_name` instead
of directly reading the environment, which in particular improves the security
of OCaml processes running in the SYSTEM security context by mitigating
privileged file operation attacks. For all other processes running with the
default environment (where `TEMP` is set), there is no discernible change.
(Antonin Décimo, review by Nicolás Ojeda Bär and David Allsopp)
- #13504, #13625: Add `Thread.set_current_thread_name`.
(Romain Beauxis, review by Gabriel Scherer and Antonin Décimo)
- #13576: Introduce internal helpers to convert between time representations.
On Windows, prevent erroneously waiting for an unbounded time in Unix.select
if more than 64 file descriptors per lists are watched, or if watching
non-socket file descriptors, and a timeout longer than $2^{32}$ milliseconds
is used. Cap the timeout to $2^{32}$ milliseconds.
(Antonin Décimo, review by Gabriel Scherer and Miod Vallat)
### Tools:
- #12019: ocamlc: add `align_double` and `align_int64` to `ocamlc -config`
output.
(Romain Beauxis, review by David Allsopp)
- #12642, #13536: in the toplevel, print shorter paths for constructors
and labels when only some modules along their path are open.
(Gabriel Scherer, review by Florian Angeletti)
- #13686: Fix Python debugger extensions (for LLDB and GDB) to restore
functionality broken by #13272.
(Nick Barnes, review by Tim McGilchrist Gabriel Scherer)
- #13199, #13485: Support running native debuggers in ocamltest.
(Tim McGilchrist and Sebastien Hinderer, review by Sebastien Hinderer,
Gabriel Scherer and Antonin Décimo)
- #13764, #13779: add missing "-keywords" flag to ocamldep and ocamlprof
(Florian Angeletti, report by Prashanth Mundkur, review by Gabriel Scherer)
- #13877: ocamldoc, add a `-latex-escape-underscore` flag to control the
escaping of `_` underscore in latex references (in order to be able to match
odoc behaviour).
(Florian Angeletti, review by Gabriel Scherer)
### Manual and documentation:
- #13694: Fix name for caml_hash_variant in the C interface.
(Michael Hendricks)
- #13732: Document that custom finalizers must not access the OCaml heap, etc.
(Josh Berdine, review by Stephen Dolan and Guillaume Munch-Maccagnoni)
### Compiler user-interface and warnings:
- #13428: support dump=[source | parsetree | lambda | ... | cmm | ...]
in OCAMLRUNPARAM
(Gabriel Scherer, review by Vincent Laviron)
- #13493: Clearer error message in ocamlc for conflicting link options for
C stubs when shared libraries are not available.
(David Allsopp, review by Gabriel Scherer)
- #13563, lighter inline code styling for output without bold support: inline
code is no longer printed as "..." to avoid confusion with OCaml strings.
(Florian Angeletti, review by Richard Eisenberg)
- #13568, composable formatting for warning and alert messages
(Florian Angeletti, review by Richard Eisenberg)
- #13587: Enable native backend on x86_64 GNU/Hurd.
(Samuel Thibault, review by Antonin Décimo, Sébastien Hinderer and Miod
Vallat)
- #13601: Enable natdynlink on x86_64 GNU/Hurd
(Samuel Thibault, review by Sébastien Hinderer)
- #13663: Improve the error message when GADT parameter variance cannot be
checked.
(Stefan Muenzel, review by Gabriel Scherer and Florian Angeletti)
- #13646: Improve the error messages when a recursive module type
references another recursive module type.
(Stefan Muenzel, review by Florian Angeletti and Gabriel Scherer)
- #13702, #13865: Specialized error messages for functors appearing in contexts
where non-functors were expected `module A: sig ... end = Set.Make`
(and the reverse)
(Florian Angeletti, report by Jeremy Yallop, review by Gabriel Scherer)
- #13788, #13813: Keep the module context in spellchecking hints.
`Fun.protact` now prompts `Did you mean "Fun.protect?"` rather than
`Did you mean "protect?"`.
(Florian Angeletti, suggestion by Daniel Bünzli, review by Gabriel Scherer)
- #13809: Distinguish `(module M : S)` and `(module M) : (module S)` and
change locations of error messages when `S` is ill-typed in `(module S)`
(Samuel Vivien, review by Florian Angeletti and Gabriel Scherer)
- #13814: Add an `unused-type-declaration` when using a `t as 'a` with no other
occurences of `'a`
(Samuel Vivien, review by Florian Angeletti)
- #13817: align spellchecking hints with the possibly misspelled identifier/
Error: Unbound type constructor "aray"
Hint: Did you mean "array"?
(Florian Angeletti, suggestion by Daniel Bünzli, review by Gabriel Scherer)
- #13818: better delimited hints in error message
(Florian Angeletti, review by Gabriel Scherer)
### Internal/compiler-libs changes:
- #13314: Comment the code of Translclass
(Vincent Laviron and Nathanaëlle Courant, review by Olivier Nicole)
- #13624: Added location to exception definitions and type extensions
(Samuel Vivien, review by Gabriel Scherer)
- #13425: undocumented -dmatchcomp flag for the debug
output of the pattern-matching compiler
(Gabriel Scherer, review by Vincent Laviron and Nicolás Ojeda Bär)
- #13460: introduce a variant of all predefined types
(Gabriel Scherer, review by Ulysse Gérard and Florian Angeletti)
- #13457, #13537: Annotate alloc/free open/close pairs of functions
with compiler attributes for static analysis.
(Antonin Décimo, review by Gabriel Scherer and Florian Angeletti)
- #13464: Use generic types in call to `subtype`. This improves
inference of type-directed disambiguation in principal mode.
(Richard Eisenberg, review by Jacques Garrigue)
- #13539, #13776: Use nanosleep instead of usleep or select, if available.
(Antonin Décimo, review by Miod Vallat and Gabriel Scherer)
- #13606: Fix Numbers.Int_base.compare
(Mark Shinwell, review by Vincent Laviron)
- #13612: Refactor `type_application`
(Ulysse Gérard, Leo White, review by Antonin Décimo, Gabriel Scherer,
Samuel Vivien, Florian Angeletti and Jacques Garrigue)
- #13748: Add a .editorconfig file for basic editor auto-configuration.
(Antonin Décimo, review by Gabriel Scherer and David Allsopp)
- #13744: Refactor in `collect_apply_args`
(Samuel Vivien, review by Florian Angeletti and Gabriel Scherer)
- #13787: a new -dcanonical-ids option to show canonicalized identifier stamps
in -d{lambda,cmm,...} outputs.
(Gabriel Scherer, review by Vincent Laviron and David Allsopp,
suggested by David Allsopp)
- #13302: Store locations of longidents components
(Ulysse Gérard and Jules Aguillon, review by Jules Aguillon
and Florian Angeletti)
- #13820: Add a new option -i-variance to print the variance of every
type parameter; bivariance is printed as `+-`, and for consistency,
parser is modified too to accept `+-` and `-+` as `type_variance`.
(Takafumi Saikawa and Jacques Garrigue, review by Florian Angeletti)
- #13848: Add all paths components to the cmt files indexes
(Ulysse Gérard, review by Florian Angeletti)
- #13856: Add a new indirection in types AST called `package` that stores the
content of a `Tpackage` node
(Samuel Vivien, review by Florian Angeletti)
### Build system:
- #13431: Simplify github action responsible for flagging PRs with
the `parsetree-changes` label and extend it to mention the @ppxlib-dev
team.
(Nathan Rebours, review by Florian Angeletti)
- #13494: Use native symlinks on Windows for the OCaml installation, reducing
disk usage considerably.
(David Allsopp, review by Nicolás Ojeda Bär and Gabriel Scherer)
* #13526, #13789, #13804: Simplify the build of cross compilers
This replaces the configure `--with-target-bindir` option by an equivalent
`TARGET_BINDIR` variable
(Samuel Hym, review by Miod Vallat, Xavier Leroy, Antonin Décimo and Sébastien
Hinderer)
- #13789: Strictly validate the host and target triplets when building for the
Windows ports to be *-*-cygwin, *-w64-mingw32* or *-pc-windows. Other Cygwin
variants used to be rejected - other MSVC and mingw-w64 variants are now
rejected too.
(David Allsopp, review by Antonin Décimo and Gabriel Scherer)
### Bug fixes:
- #13691: Make four globals underlying Gc.control atomic to avoid C data
races against them
(Jan Midtgaard, review by Miod Vallat and Sadiq Jaffer)
- #13454: Output a correct trace of the C_CALLN bytecode.
(Miod Vallat, review by Antonin Décimo)
- #13595: Use x19 as Canonical Frame Address (CFA) register. This would cause
backtraces to be truncated when calling no alloc C code.
(Tim McGilchrist, report by Nick Barnes, review by Nick Barnes)
* #13605: Fix ungenerated constraints when they where impossible due to polyvars
issues
(Samuel Vivien, review by Florian Angeletti, Richard Eisenberg
and Jacques Garrigue)
- #13677, #13679: domain.c: remove backup_thread_running to simplify
concurrent state updates to the backup thread status.
(Gabriel Scherer, review by Jan Midtgaard and Miod Vallat,
report by Jan Midtgaard)
- #13703: wrong explanation for some polymorphic-variant subtyping errors
(Gabriel Scherer, review by Jacques Garrigue,
report by Wiktor Kuchta and Richard Eisenberg)
- #13710: Support unicode identifiers in comments.
(Pieter Goetschalckx, review by Florian Angeletti and Gabriel Scherer)
- #13763: Track type of variables bound by as-patterns
(Leo White, review by Gabriel Scherer, port by Vincent Laviron)
- #13778, #13811: do not warn for unused type declarations when the type is used
in a first-class module type (`module S with type t = int)`.
(Florian Angeletti, report by Nicolás Ojeda Bär, review by Gabriel Scherer)
- #13790: Fix bytecode-only build of Cygwin when flexlink is being bootstrapped
with the compiler.
(David Allsopp, review by Antonin Décimo and Miod Vallat)
- #13812: Add forgotten check about the validity of the type variable name on
the right-hand side of `_ as _`.
(Samuel Vivien, review by Gabriel Scherer)
- #13845: Fix bug in untypeast/pprintast for value bindings with polymorphic
type annotations.
(Chris Casinghino, review by Florian Angeletti and Gabriel Scherer)
- #13867: Fix bug with some recursive bindings of lazy values.
(Guillaume Bury and Vincent Laviron, review by Stefan Muenzel
and Gabriel Scherer)
- #13875, #13878: Add dedicated constructor for mutable variable access in
Cmm to prevent bugs linked to incorrect handling of coeffects.
(Vincent Laviron, review by Gabriel Scherer)
- #13880: Make object stat counters atomic
(Dimitris Mostrous, review by Gabriel Scherer and Nicolás Ojeda Bär)
OCaml 5.3.0 (8 January 2025)
----------------------------
(Changes that can break existing programs are marked with a "*")
### Restored backend:
- #12954: Restore the MSVC port
(David Allsopp, Antonin Décimo, Samuel Hym, and Miod Vallat, review by Nicolás
Ojeda Bär)
- #13093: Allow building the MSVC port with clang-cl.
(Antonin Décimo, review by Nicolás Ojeda Bär, Samuel Hym,
David Allsopp and Sébastien Hinderer)
### Language features:
- #12828, #13283: Add short syntax for dependent functor types `(X:A) -> ...`
(Jeremy Yallop, review by Nicolás Ojeda Bär and Gabriel Scherer)
- #12309, #13158: Add syntax support for deep effect handlers
(Leo White, Tom Kelly, Anil Madhavapeddy, KC Sivaramakrishnan, Xavier Leroy
and Florian Angeletti, review by the same, Hugo Heuzard, and Ulysse Gérard)
- #11736, #12664, #13628: Support utf-8 encoded source files and latin-9
compatible identifiers.
(Xavier Leroy and Florian Angeletti, review by Daniel Bünzli and
Jules Aguillon)
### Type system
- #11891, #12507: Allow to name new locally abstract types in constructor type
annotations.
(Jacques Garrigue, report and review by Gabriel Scherer and Florian Angeletti)
### Runtime system:
- #13419: Fix memory bugs in runtime events system.
(B. Szilvasy and Nick Barnes, review by Miod Vallat, Nick Barnes,
Tim McGilchrist, and Gabriel Scherer)
- #13364: Emit major slice counters in the runtime events.
(KC Sivaramakrishnan and Sadiq Jaffer, review by Gabriel Scherer)
- #13382: Add more documentation for Runtime_events types
(Sadiq Jaffer, review by Tim McGilchrist, Miod Vallat and KC Sivaramakrishnan)
- #13370: Fix a low-probability crash when calling Gc.counters.
(Demi Marie Obenour, review by Gabriel Scherer)
- #13272: Allow maximum number of domains to be specified as a OCAMLRUNPARAM
parameter.
(KC Sivaramakrishnan, review by Guillaume Munch-Maccagnoni, Miod Vallat,
Gabriel Scherer, David Allsopp, request by Zachary Yedidia).
- #11911, #12923: Multicore statistical memory profiling.
This restores a notable OCaml 4 feature that was missing
in OCaml 5.
(Nick Barnes, review by Stephen Dolan, Jacques-Henri Jourdan
and Guillaume Munch-Maccagnoni).
- #12579: OS-based Synchronisation for Stop-the-World Sections
(B. Szilvasy, review by Miod Vallat, Nick Barnes, Olivier Nicole,
Gabriel Scherer and Damien Doligez)
- #12789: Restore caml_unregister_frametable from OCaml 4
(Frédéric Recoules, review by Gabriel Scherer)
- #13003: new, more consistent names for array-creation C functions
(Gabriel Scherer, review by Olivier Nicole)
- #13013: introduce a `caml_result` type to supersede the
use of 'encoded exception values' in the FFI.
(Gabriel Scherer, review by Damien Doligez,
Guillaume Munch-Maccagnoni and Xavier Leroy,
suggested by Guillaume Munch-Maccagnoni)
- #12407, #13226: Resource-handling improvements: add
exception-returning variants for all exception-raising functions in
`caml/fail.h`, for the purpose of cleaning-up state and resources
before raising.
(Guillaume Munch-Maccagnoni, review by Damien Doligez, Xavier Leroy
and Gabriel Scherer)
- #13086: Avoid spurious major GC slices.
(Damien Doligez, report by Stephen Dolan, review by Gabriel Scherer
and Stephen Dolan)
- #11779, #13117: Improve logic for fiber stack alignment.
(Miod Vallat, report by Damien Doligez, review by Gabriel Scherer)
- #12839: Remove ATOMIC_UINTNAT_INIT from camlatomic.h (as part of a larger
cleanup of camlatomic.h)
(David Allsopp, review by Antonin Décimo, Sébastien Hinderer, Samuel Hym,
Guillaume Munch-Maccagnoni and Miod Vallat)
- #13163: Enable frame pointers on macOS x86_64
(Tim McGilchrist, review by Sébastien Hinderer and Fabrice Buoro)
- #12951: Constify constructors and flags tables in C code (take 2).
Now these tables will go in the readonly segment, where they belong.
(Antonin Décimo, review by David Allsopp)
- #10696: Introduce __has_attribute and __has_c_attributes in
<caml/misc.h> to test the support of specific atributes in C
code. Introduce fallthrough as a wrapper around the fallthrough
attribute.
(Antonin Décimo, review by Nicolás Ojeda Bär, Xavier Leroy, and
Gabriel Scherer)
- #13083: Use macros from limits.h to avoid signed-integer wrap-around.
Introduce CAML_{U,}INTNAT_{MIN,MAX} macros to expose {u,}intnat limits.
(Antonin Décimo, review by Nick Barnes, Xavier Leroy, Gabriel Scherer,
and Miod Vallat)
- #13239: Check whether the compiler supports the labels as values
extension to enable threaded code interpretation.
(Antonin Décimo, review by Miod Vallat)
- #13238: Enable software prefetching on x86 and x86_64 when building
with MSVC or clang-cl.
(Antonin Décimo, review by Miod Vallat)
- #13241, #13261, #13271: Add CFI_SIGNAL_FRAME to ARM64 and RiscV runtimes,
for the purpose of displaying backtraces correctly in GDB.
(Tim McGilchrist, review by Miod Vallat, Gabriel Scherer and
KC Sivaramakrishnan)
- #13139: Simplify CAMLalign to always use C23/C++11 alignas or C11
_Alignas. Ensures that stat data is always aligned to the best
boundary.
(Antonin Décimo, review by Miod Vallat and Xavier Leroy)
- #13280: Check for support of compiler attributes. Allows using
compiler attributes with clang-cl.
(Antonin Décimo, review by Miod Vallat)
- #13243: Enable C compiler warnings internally when building with
clang-cl or MSVC. Provide fixes too.
(Antonin Décimo, review by Miod Vallat and Xavier Leroy)
- #13242: Define and use unreachable and trap annotation, and clean-up some
runtime assertions.
(Antonin Décimo, review by Miod Vallat, Gabriel Scherer, and David Allsopp)
- #13402, #13512, #13549, #13553: Revise bytecode implementation of callbacks
so that it no longer produces dangling registered bytecode fragments.
(Xavier Leroy, report by Jan Midtgaard, analysis by Stephen Dolan,
review by Miod Vallat)
- #13407: Add Runtime_events.EV_EMPTY_MINOR.
(Thomas Leonard, review by KC Sivaramakrishnan, Sadiq Jaffer and
Gabriel Scherer)
- #13522: Confirm runtime events ring is still active after callback.
(KC Sivaramakrishnan, review by Sadiq Jaffer and Miod Vallat)
- #13529: Do not write to event ring after going out of stw participant set.
(KC Sivaramakrishnan, review by Sadiq Jaffer)
### Code generation and optimizations:
- #13014: Enable compile-time option -function-sections on all previously
unsupported native backends (POWER, riscv64 and s390x)
(Miod Vallat, review by Nicolás Ojeda Bär)
- #7241, #12555, #13076, #13138, #13338, #13152, #13153, #13154:
fix a soundness bug in the pattern-matching compiler
when side-effects mutate the scrutinee during matching.
(Gabriel Scherer, review by Nick Roberts)
- #13341: a warning when the pattern-matching compiler pessimizes code
because side-effects may mutate the scrutinee during
matching. (This warning is disabled by default, as this rarely
happens and its performance impact is typically not noticeable.)
(Gabriel Scherer, review by Nick Roberts, Florian Angeletti
and David Allsopp)
- #13179: Fix evaluation of toplevel lets in classes containing
local opens
(Vincent Laviron, review by Hugo Heuzard, Nathanaëlle Courant
and Gabriel Scherer)
- #13543: Remove some String-Bytes conversion from the stdlib to behave better
with js_of_ocaml
(Hugo Heuzard, review by Gabriel Scherer)
### Standard library:
- #12884: Add `Queue.drop`
(Léo Andrès, review by Nicolás Ojeda Bär and Gabriel Scherer)
- #13168: In Array.shuffle, clarify the code that validates the
result of the user-supplied function `rand`, and improve the
error message that is produced when this result is invalid.
(François Pottier, review by Florian Angeletti, Daniel Bünzli
and Gabriel Scherer)
- #12133: Expose support for printing substrings in Format
(Florian Angeletti, review by Daniel Bünzli, Gabriel Scherer
and Nicolás Ojeda Bär)
- #12869: Add List.take, List.drop, List.take_while and List.drop_while
(Kate Deplaix and Oscar Butler-Aldridge, review by Nicolás Ojeda Bär,
Craig Ferguson and Gabriel Scherer)
- #12885: move Dynarray to an unboxed representation
(Gabriel Scherer, suggestions by Vincent Laviron,
review by Olivier Nicole and Simon Cruanes, Yann Leray, Alain Frisch)
- #13047: Add Sys.poll_actions to (only) run pending runtime actions.
(Nick Barnes, review by Gabriel Scherer, Guillaume Munch-Maccagnoni, and
Vincent Laviron)
- #13144: Dynarray.{equal, compare}
(Gabriel Scherer,
review by Jeremy Yallop, Daniel Bünzli and Olivier Nicole,
request by Olivier Nicole)
- #13171: expose `Domain.self_index : unit -> int` (a somewhat-dense
indexing of currently-running domains) for advanced use-cases of
domain-indexed concurrent data structures.
(Gabriel Scherer,
review by KC Sivaramakrishnan, Miod Vallat and Nicolás Ojeda Bär,
report by Vesa Karvonen)
- #13197: Dynarray.blit, which allows to extend the destination
dynarray (0 <= dst_pos <= dst_length).
(Gabriel Scherer, report by Hazem ElMasry,
review by Olivier Nicole, Hazem ElMasry and Nicolás Ojeda Bär)
* #13240: Add Uchar.seeded_hash, Change Uchar.hash implementation.
Previously, Uchar.hash was aliased to Uchar.to_int. If you need that behavior,
change your module instantiation from eg `module HT = Hashtbl.Make(Uchar)` to
```
module HT = Hashtbl.Make(struct
...
let hash = Uchar.to_int
end)
```
If the current implementation is desired, and you have a hashtable module `HT`
(produced with the `Make` functor) in persistent storage, use `HT.rebuild` to
ensure it doesn't break when reading from or writing to buckets.
(Hazem ElMasry, review by Gabriel Scherer and Nicolás Ojeda Bär)
- #13318: Fix regression in GC alarms, and fix them for flambda.
(Guillaume Munch-Maccagnoni, report by Benjamin Monate, review by
Vincent Laviron and Gabriel Scherer)
- #13296: Add mem, memq, find_opt, find_index, find_map and find_mapi
to Dynarray.
(Jake H, review by Gabriel Scherer and Florian Angeletti)
### Other libraries:
- #11996: release the dependency of dynlink on compilerlibs.
(Sébastien Hinderer and Stephen Dolan, review by Damien Doligez and
Hugo Heuzard)
- #13326: Implement Unix.O_APPEND on windows.
(Romain Beauxis, review by Miod Vallat, Gabriel Scherer and Antonin Décimo)
### Tools:
- #11716: ocamllex: mismatched parentheses and curly brackets are now caught
by ocamllex, instead of causing invalid OCaml code to be generated.
(Demi Marie Obenour, review by Damien Doligez and Xavier Leroy)
- #12904: Run the testsuite with ThreadSanitizer on a PR when label
`run-thread-sanitizer` is added
(Olivier Nicole, suggested by Sébastien Hinderer and David Allsopp, review by
Gabriel Scherer)
* #13114: Support ocamldebug remote debugging over IPv6 on all
platforms, and over Unix domain sockets on Windows.
(Antonin Décimo, review by Gabriel Scherer and Miod Vallat)
- #13136: Rewrite GDB extensions and macros in debugger-agnostic Python, and add
LLDB support for them.
(Nick Barnes, review by Tim McGilchrist and Gabriel Scherer)
### Toplevel:
- #12891: Improved styling for initial prompt
(Florian Angeletti, review by Gabriel Scherer)
- #13053: Improved display of builtin types such as `_ list` when aliased.
(Samuel Vivien, review by Florian Angeletti)
### Manual and documentation:
- #13370: Document that that temporary variables holding GCd pointers must
not be live across a GC.
(Demi Marie Obenour)
- #12298: Manual: emphasize that Bigarray.int refers to an OCaml integer,
which does not match the C int type.
(Edwin Török, review by Florian Angeletti)
- #12868: Manual: simplify style colours of the post-processed manual and API
HTML pages, and fix the search button icon
(Yawar Amin, review by Simon Grondin, Gabriel Scherer, and Florian Angeletti)
- #12949: document OCaml release cycles and version strings in
`release-info/introduction.md`.
(Florian Angeletti, review by Fabrice Buoro, Kate Deplaix, Damien Doligez, and
Gabriel Scherer)
- #12976: Manual: use webman/<version>/*.html and
webman/<version>/api/ for OCaml.org HTML manual generation
(Shakthi Kannan, review by Hannes Mehnert, and Florian Angeletti)
- #13045: Emphasize caution about behaviour of custom block finalizers.
(Nick Barnes)
- #13216: document the new `caml_result` type in the FFI chapter of the manual.
(Gabriel Scherer, review by Miod Vallat, Daniel Bünzli, Nick Barnes,
Guillaume Munch-Maccagnoni and Antonin Décimo)
- #13287: stdlib/sys.mli: Update documentation on Sys.opaque_identity
following #9412.
(Matt Walker, review by Guillaume Munch-Maccagnoni and Vincent Laviron)
- #13295: Use syntax for deep effect handlers in the effect handlers manual
page.
(KC Sivaramakrishnan, review by Anil Madhavapeddy, Florian Angeletti and Miod
Vallat)
- #13424: Fix `Gc.quick_stat` documentation to clarify that returned fields
`live_words`, `live_blocks`, `free_words`, and `fragments` are not zero.
(Jan Midtgaard, review by Damien Doligez and KC Sivaramakrishnan)
- #13440: Update documentation of `Gc.{control,get,set}` to reflect fields
not currently supported on OCaml 5.
(Jan Midtgaard, review by Gabriel Scherer)
- #13469, #13474, #13535: Document that [Hashtbl.create n] creates a hash table
with a default minimal size, even if [n] is very small or negative.
(Antonin Décimo, Nick Barnes, report by Nikolaus Huber and Jan Midtgaard,
review by Florian Angeletti, Anil Madhavapeddy, Gabriel Scherer,
and Miod Vallat)
- #13666: Rewrite parts of the example code around nested lists in Chapter 6
(Polymorphism and its limitations -> Polymorphic recursion) giving the
"depth" function [in the non-polymorphically-recursive part of the example]
a much more sensible behavior; also fix a typo and some formatting.
(Frank Steffahn, review by Florian Angeletti)
- #13668: Document the basic support for unicode identifiers and the switch to
UTF-8 encoded Unicode text for OCaml source file
(Florian Angeletti, review by Nicolás Ojeda Bär and Daniel Bünzli)
### Compiler user-interface and warnings:
* #12084, #13669, #13673: Check link order when creating archive and when using
ocamlopt.
(Hugo Heuzard, review by Stefan Muenzel and Sébastien Hinderer)
- #12980: Explain type mismatch involving first-class modules by including
the module level error message
(Florian Angeletti, review by Vincent Laviron)
- #12985, #12988: Better error messages for partially applied functors.
(Florian Angeletti, report by Arthur Wendling, review by Gabriel Scherer)
- #13034, #13260: Better error messages for mismatched function labels
(Florian Angeletti, report by Daniel Bünzli, review by Gabriel Scherer and
Samuel Vivien)
- #13051: Add a "Syntax error" to error messages for invalid package signatures.
(Samuel Vivien, review by Gabriel Scherer)
- #13099: Fix erroneous loading of cmis for some module type errors.
(Nick Roberts, review by Florian Angeletti)
- #13151, name conflicts explanation as a footnote
(Florian Angeletti, review by Gabriel Scherer)
- #13228: Re-export Cmt2annot.{iterator,binary_part} which had become hidden
since #11288 and broke ocamlbrowser.
(David Allsopp, report by Jacques Garrigue, review by Sébastien Hinderer)
- #13251: Register printer for errors in Emitaux
(Vincent Laviron, review by Miod Vallat and Florian Angeletti)
- #13255: Re-enable warning 34 for unused locally abstract types
(Nick Roberts, review by Chris Casinghino and Florian Angeletti)
- #12182: Improve the type clash error message.
For example, this message:
This expression has type ...
is changed into:
The constant "42" has type ...
(Jules Aguillon, review by Gabriel Scherer and Florian Angeletti)
- #13471: add `-keywords <version?+list>` flag to define the list of keywords
recognized by the lexer, for instance `-keywords 5.2` disable the `effect`
keyword.
(Florian Angeletti, review by Gabriel Scherer)
### Internal/compiler-libs changes:
- #11129, #11148: enforce that ppxs do not produce `parsetree`s with
an empty list of universally quantified type variables
(`. int -> int` instead of `'a . int -> int'`)
(Florian Angeletti, report by Simmo Saan, review by Gabriel Scherer)
- #12534: document and refactor Matching.mk_failaction_pos
(Gabriel Scherer, review by Vincent Laviron and Nick Roberts)
- #13076: change the handling of Match_failure exits in the pattern-matching
compiler, to prepare for a complete fix for #7241
(Gabriel Scherer, review by Thomas Refis and Nick Roberts)
- #12896: Simplify the compilation of custom bytecode runtimes by explicitly
compiling the primitives file before calling the linker. Tidy-up both the
generating code and the output itself for C code being generated by the
bytecode linker in `-custom` and `-output-*` modes.
(David Allsopp, Antonin Décimo and Samuel Hym, review by Vincent Laviron)
- #12932: Remove useless code in Typecore.type_label_exp (was a fix for #4862)
(Jacques Garrigue, review by Gabriel Scherer)
- #12943: Make transient_expr.scope a bitfield, and use it to store marks.
Marks are automatically allocated, and removed when leaving their scope.
Falls back to using TransientTypeSet when marks are exhausted.
(Jacques Garrigue and Takafumi Saikawa, review by Basile Clément)
- #12946: Make generalization automatic when leaving scope.
As a result, the `Ctype.generalize*` and `Ctype.correct_levels` functions
were removed. The latter is now called `Ctype.duplicate_type`.
(Jacques Garrigue and Takafumi Saikawa, review by Richard Eisenberg)
- #12968: Attach location to constants in the parsetree
(Jules Aguillon, review by Gabriel Scherer)
- #12959, #13055: Avoid an internal error on recursive module type inconsistency
(Florian Angeletti, review by Jacques Garrigue and Gabriel Scherer)
- #13049: graphical debugging printer for types
(Florian Angeletti, review by Gabriel Scherer)
- #13074, #13082, #13084: refactoring in the pattern-matching compiler
(Gabriel Scherer, review by Thomas Refis, Vincent Laviron and Nick Roberts)
- #13067: rework volatile memory access rules under TSan to consider properly
aligned smaller-than-register read operations as atomic, which gets rid of
false positives on s390x
(Miod Vallat, review by Fabrice Buoro)
- #13162: Use quoted strings to clarify code being generated.
(Antonin Décimo, review by Miod Vallat and Gabriel Scherer)
- #13015: Emit floating-point literals in .rodata section on ELF arm64
platforms (Linux, *BSD).
(Miod Vallat, review by Nicolás Ojeda Bär)
- #13169, #13311: Introduce a document data type for compiler messages
rather than relying on `Format.formatter -> unit` closures.
(Florian Angeletti, review by Gabriel Scherer)
- #13193: Remove the unused env_init field from class blocks
(Vincent Laviron, review by Jacques Garrigue)
- #13257: integrate MetaOCaml in the Menhir grammar to ease MetaOCaml
maintenance. This is a purely internal change: there is no support
in the lexer, so no change to the surface OCaml grammar.
(Oleg Kiselyov, Gabriel Scherer and Florian Angeletti,
review by Jeremy Yallop)
- #13286: Distinguish unique identifiers `Shape.Uid.t` according to their
provenance: either an implementation or an interface.
(Ulysse Gérard, review by Florian Angeletti and Leo White)
- #13289: Use C99 for loop to reduce the scope of the for loop iterator.
(Antonin Décimo, review by Miod Vallat and Gabriel Scherer)
- #13308: keep track of relations between declaration in the cmt files. This is
useful information for external tools for navigation and analysis purposis.
(Ulysse Gérard, Florian Angeletti, review by Florian Angeletti and Gabriel
Scherer)
- #13336: compiler-libs, split the `Printtyp` in three to only keep
"user-friendly" functions in the `Printtyp` module.
(Florian Angeletti, review by Gabriel Scherer)
- #13361: split runtime/array.c functions to consistently expose
uniform_array and floatarray versions, use floatarray versions
in Float.Array.
(Gabriel Scherer, review by Nicolás Ojeda Bär)