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Working version
---------------
(Changes that can break existing programs are marked with a "*")
### Language features:
### Runtime system:
- #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)
### Code generation and optimizations:
### Standard library:
### Other libraries:
- #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)
### Tools:
### Manual and documentation:
### Compiler user-interface and warnings:
- #13428: support dump=[source | parsetree | lambda | ... | cmm | ...]
in OCAMLRUNPARAM
(Gabriel Scherer, review by Vincent Laviron)
### Internal/compiler-libs changes:
- #13425: undocumented -dmatchcomp flag for the debug
output of the pattern-matching compiler
(Gabriel Scherer, review by Vincent Laviron and Nicolás Ojeda Bär)
### Build system:
### Bug fixes:
- #13408: Fix misplaced debug runtime assertion triggerable by a race
between domain exit and backup thread
(Miod Vallat and Gabriel Scherer, report by Jan Midtgaard)
- #13454: Output a correct trace of the C_CALLN bytecode.
(Miod Vallat, review by Antonin Décimo)
OCaml 5.3.0
___________
(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)
- 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)
### 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)
- #13352: Concurrency refactors and cleanups.
(Antonin Décimo, review by Gabriel Scherer, David Allsopp,
and Miod Vallat)
### 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)
### Standard library:
- #13310: Add Stdlib.Pair
(Victoire Noizet, review by Nicolás Ojeda Bär, Daniel Bünzli, Xavier Van de
Woestyne, Jeremy Yallop and Florian Angeletti)
- #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)
- #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).
### 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)
### Compiler user-interface and warnings:
* #12084: 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)
### 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 Fabien 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)
- #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)
### Build system:
- #12909: Reorganise how MKEXE_VIA_CC is built to make it correct for MSVC by
grouping all the linker flags at the end of the C compiler commandline
(David Allsopp and Samuel Hym, review by Nicolás Ojeda Bär)
- #12992, #13009: Check that flexlink can be executed only when building in a
native windows environment.
(Romain Beauxis, review by David Allsopp and Sébastien Hinderer)
- #12996: Only link with -lgcc_eh when available.
(Romain Beauxis, review by David Allsopp and Miod Vallat)
* #13200: Do not use CFLAGS for linking.
(Sébastien Hinderer, review by Gabriel Scherer, Antonin Décimo,
Miod Vallat and Samuel Hym)
- #13201, #13244: Fix and speedup builds with TSan.
(Sébastien Hinderer, review by Miod Vallat, Gabriel Scherer and
Olivier Nicole)
* #12578, #12589, #13322: Use configured CFLAGS and CPPFLAGS *only* during the
build of the compiler itself. Do not use them when compiling third-party
C sources through the compiler. Flags for compiling third-party C
sources can still be specified at configure time in the
COMPILER_{BYTECODE,NATIVE}_{CFLAGS,CPPFLAGS} configuration variables.
(Sébastien Hinderer, report by William Hu, review by David Allsopp)
- #13285: continue the merge of the sub-makefiles into the root
Makefile started with #11243, #11248, #11268, #11420, #11675,
#12198, #12321, #12586, #12616, #12706 and #13048.
(Sébastien Hinderer, review by David Allsopp and Florian Angeletti)
### Bug fixes:
- #12854: Add a test in the regression suite that flags the bug #12825.
(Luc Maranget)
- #12888: fix printing of uncaught exceptions in `.cmo` files passed on the
command-line of the toplevel.
(Nicolás Ojeda Bär, review by Florian Angeletti, report by Daniel Bünzli)
- #12910, #12920: Fix an unsound interaction between first-class modules
and polymorphic records by saving and restoring univar_pairs.
(Stephen Dolan, review by Gabriel Scherer, report by Jeremy Yallop)
- #12994: Remove un-used and unsafe caml_drop_continuation
(Tim McGilchrist, reviewed by Gabriel Scherer and Miod Vallat)
- #12963: Restore caml_runtime_parameters implementation. This primitive allows
programs to query the runtime parameters supplied to an OCaml program.
Implementation missing since OCaml 5.0.
(Tim McGilchrist, reviewed by David Allsopp and Miod Vallat)
- #13012: parsing: Fix dropped attributes after a '-' or '+'
The syntax '-(1 [@foo])' was incorrectly parsed as '-1'.
(Jules Aguillon, reviewed by Gabriel Scherer, report by Gabriel Scherer)
* #13070: On Windows, when configured with bootstrapped flexdll, don't add
+flexdll to the search path when -nostdlib is specified (which then means
-L <path-to-flexdll> no longer gets passed to the system linker).
(David Allsopp, review by Florian Angeletti)
- #13089: Fix bug in `runtime_events` library which could result in garbled
output under Windows.
(B. Szilvasy, review by Nicolás Ojeda Bär and Miod Vallat)
- #13088: A few type-checker behaviors look at a type to see if there are
any labeled arguments in it. This sometimes required expansion, which
could, in obscure scenarios, result in superfluous type errors.
(Richard Eisenberg, review by Gabriel Scherer and Jacques Garrigue)
- #13103: FreeBSD/amd64: properly annotate .o files with non-executable stack
notes (Konstantin Belousov, review by Nicolás Ojeda Bär)
- #13150: improve a transitive-closure computation algorithm in the flambda
middle-end to avoid a compilation time blowup on Menhir-generated code
(Florian Weimer, review by Gabriel Scherer and Pierre Chambart,
report by Richard Jones)
- #13166: Fix a MinGW/MSVC Sys.rename regression on renaming a parent directory
to an empty child directory.
(Jan Midtgaard, review by Antonin Décimo, Sébastien Hinderer, and
David Allsopp)
- #13185, #13192: Reject type-level module aliases on functor parameter
inside signatures.
(Jacques Garrigue, report by Richard Eisenberg, review by Florian Angeletti)
- #13170: Fix a bug that would result in some floating alerts `[@@@alert ...]`
incorrectly triggering Warning 53.
(Nicolás Ojeda Bär, review by Chris Casinghino and Florian Angeletti)
- #13203: Do not issue warning 53 is the compiler is stopping before attributes
have been accurately marked.
(Chris Casinghino, review by Florian Angeletti)
- #13207: Be sure to reload the register caching the exception handler in
caml_c_call and caml_c_call_stack_args, as its value may have been changed
if the OCaml stack is expanded during a callback.
(Miod Vallat, report by Vesa Karvonen, review by Gabriel Scherer and
Xavier Leroy)
- #13209: Fix configure test that checks whether `ar` supports `@FILE`
arguments.
(Nicolás Ojeda Bär, report by Boris D.)
- #13221: Compute more accurate instruction sizes for branch relocation on
POWER.
(Miod Vallat, review by Gabriel Scherer)
- #13252: Rework register assignment in the interpreter code on m68k on Linux,
due to the %a5 register being used by Glibc.
(Miod Vallat, report by Stéphane Glondu, review by Gabriel Scherer and
Xavier Leroy)
- #13247: Disable lib_unix/kill test for MacOS AMD64 with TSan, linking
to llvm bug report causing infinite signal loops.
(Tim McGilchrist, review by Olivier Nicole, Miod Vallat, Sébastien Hinderer
and Gabriel Scherer)
- #13234, #13267: Open runtime events file in read-write mode on armel
(armv5) systems due to atomic operations limitations on that
platform.
(Stéphane Glondu, review by Miod Vallat and Vincent Laviron)
- #13273: Fix a call to test in configure.ac that was causing errors when
LDFLAGS contains several words.
(Stéphane Glondu, review by Miod Vallat)
- #13290: Fix uninitialized and out of bounds reads in runtime_events_consumer.c
(Edwin Török, review by Miod Vallat and Antonin Décimo)
- #13306: An algorithm in the type-checker that checks two types for equality
could sometimes, in theory, return the wrong answer. This patch fixes the
oversight. No known program triggers the bug.
(Richard Eisenberg, review by Florian Angeletti)
- #13400: Initialize th->signal_stack to avoid free of uninitialized data
if the user calls caml_c_thread_unregister on the main thread.
(Richard W.M. Jones, review by Guillaume Munch-Maccagnoni and
Gabriel Scherer)
- #13140: POWER back-end: fix issue with call to `caml_call_realloc_stack`
from a DLL
(Xavier Leroy, review by Miod Vallat)
- #13417: `Filename.quote_command`: fix handling of forward slashes in program
path under Win32.
(Nicolás Ojeda Bär, review by David Allsopp and Damien Doligez)
OCaml 5.2.0 (13 May 2024)
-------------------------
(Changes that can break existing programs are marked with a "*")
### Restored and new backends:
- #12276, #12601: native-code compilation for POWER (64 bits, little-endian)
(Xavier Leroy, review by KC Sivaramakrishnan, Anil Madhavapeddy,
and Stephen Dolan)
- #12667: extend the latter to POWER 64 bits, big-endian, ELFv2 ABI
(A. Wilcox, review by Xavier Leroy)
### Language features:
- #12295, #12568: Give `while true' a polymorphic type, similarly to
`assert false'
(Jeremy Yallop, review by Nicolás Ojeda Bär and Gabriel Scherer,
suggestion by Rodolphe Lepigre and John Whitington)
- #12315: Use type annotations from arguments in let rec
(Stephen Dolan, review by Gabriel Scherer)
- #11252, RFC 27: Support raw identifier syntax \#foo
(Stephen Dolan, review by David Allsopp, Gabriel Scherer and Olivier Nicole)
- #12044: Add local module open syntax for types.
```
module A = struct
type t = int
type r = unit
type s = string
end
type example = A.(t * r * s)
```
(Alistair O'Brien, review by Gabriel Scherer, Nicolás Ojeda Bär
and Florian Angeletti)
- #12456: Document the incompatibility between effects on the one
hand, and `caml_callback` and asynchronous callbacks (signal
handlers, finalisers, memprof callbacks...) on the other hand.
(Guillaume Munch-Maccagnoni, review by KC Sivaramakrishnan)
- #12375: allow use of [@untagged] for all immediate types like char, bool,
and variant with only constant constructors.
(Christophe Raffalli, review by Gabriel Scherer)
* #12502: the compiler now normalizes the newline sequence \r\n to
a single \n character during lexing, to guarantee that the semantics
of newlines in string literals is not modified by Windows tools
transforming \n into \r\n in source files.
Warning 29 [eol-in-string] is not emitted anymore, as the normalization
gives a more robust semantics to newlines in string literals.
(Gabriel Scherer and Damien Doligez, review by Daniel Bünzli, David
Allsopp, Andreas Rossberg, Xavier Leroy, report by Andreas Rossberg)
- #13130: minor fixes to pprintast for raw identifiers and local module open
syntax for types.
(Chet Murthy, review by Gabriel Scherer)
- #11736, #12664: 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:
- #12313, #11799: Do not re-build as-pattern type when a ground type annotation
is given. This allows to work around problems with GADTs in as-patterns.
(Jacques Garrigue, report by Leo White, review by Gabriel Scherer)
### Runtime system:
- #12193: Re-introduce GC compaction for shared pools
Adds a parallel compactor for the shared pools (which contain major heap
blocks sized less than 128 words). Explicit only for now, on calls to
`Gc.compact`.
(Sadiq Jaffer, Nick Barnes, review by Anil Madhavapeddy, Damien Doligez,
David Allsopp, Miod Vallat, Artem Pianykh, Stephen Dolan, Mark Shinwell
and KC Sivaramakrishnan)
- #12850: Update Gc.quick_stat data at the end of major cycles and compaction
This PR adds an additional caml_collect_gc_stats_sample_stw to the major heap
cycling stw. This means that Gc.quick_stat now actually reflects the state of
the heap after a major cycle or compaction.
(Sadiq Jaffer, review by Miod Vallat and Gabriel Scherer)
- #12859: Ensure Gc.compact does a full major before the compactor runs
(Sadiq Jaffer, review by Leo White, Mark Shinwell, Gabriel Scherer,
Josh Berdine, David Allsopp and KC Sivaramakrishnan)
- #10111: Increase the detail of location information for debugging events to
allow the end line number and character offset to be reported.
(David Allsopp, review by Nick Barnes, Enguerrand Decorne and Stephen Dolan)
- #10403, #12202: introduce `caml_ext_table_add_noexc` that does not
raise `Out_of_memory` exceptions and use it inside the blocking sections
of `caml_read_directory`. Also, check for overflows in ext table sizes.
(Xavier Leroy, report by Arseniy Alekseyev, review by Gabriel Scherer)
- #11332, #12702: make sure `Bool_val(v)` has type `bool` in C++
(Xavier Leroy, report by ygrek, review by Gabriel Scherer)
- #12772, #12787: Avoid using _Bool in public headers for the sake of C++
compatibility
(Guillaume Munch-Maccagnoni, report by KC Sivaramakrishnan, review
by Xavier Leroy and KC Sivaramakrishnan)
- #12223: Constify constructors and flags tables in C code. Now these
tables will go in the readonly segment, where they belong.
(Antonin Décimo, review by Gabriel Scherer and Xavier Leroy)
- #12234: make instrumented time calculation more thread-safe on macOS.
(Anil Madhavapeddy, review by Daniel Bünzli and Xavier Leroy)
- #12235, #12468: introduce and use the `CAMLnoret` macro as
a lighter alternative to `CAMLnoreturn_start` / `CAMLnoreturn_end`.
Implement it so as to conform with C11, C23, C++11, C++17.
(Xavier Leroy and Dhruv Maroo, with help from Antonin Décimo, review by
Gabriel Scherer and David Allsopp)
- #12275: caml/stack.h: more abstract macros to describe OCaml stacks and
how to traverse them, supporting more stack layouts.
(Xavier Leroy, review by KC Sivaramakrishnan and Fabrice Buoro)
- #12268: deliver `Out_of_memory` exception if domain creation fails
due to memory resource exhaustion. It was previous always a `Failure`.
(Anil Madhavapeddy, review by David Allsopp)
- #12300, #12314: Discard out_channel buffered data on permanent I/O error
(Xavier Leroy, report by Török Edwin, review by Anil Madhavapeddy
and Nicolás Ojeda Bär)
- #11386: Simplifications and fixes to multicore systhreads implementation.
(Guillaume Munch-Maccagnoni, review by Anil Madhavapeddy and KC
Sivaramakrishnan)
- #12875, #12879, #12882: Execute preemptive systhread switching as a
delayed pending action. This ensures that one can reason within the
FFI that no mutation happens on the same domain when allocating on
the OCaml heap from C, consistently with OCaml 4. This also fixes
further bugs with the multicore systhreads implementation.
(Guillaume Munch-Maccagnoni, bug reports and suggestion by Mark
Shinwell, review by Nick Barnes and Stephen Dolan)
- #12408: `Domain.spawn` no longer leaks its functional argument for
the whole duration of the children domain lifetime.
(Guillaume Munch-Maccagnoni, review by Gabriel Scherer)
- #12409: Fix unsafety and deadlocks should an asynchronous exception
arise at specific locations during domain creation and shutdown.
(Guillaume Munch-Maccagnoni, review by Gabriel Scherer)
- #12114: Add ThreadSanitizer support
(Fabrice Buoro and Olivier Nicole, based on an initial work by Anmol Sahoo,
review by Damien Doligez, Sébastien Hinderer, Jacques-Henri Jourdan, Luc
Maranget, Guillaume Munch-Maccagnoni, Gabriel Scherer)
- #11911, #12381: Restore statmemprof functionality in part, with
some API changes in Gc.Memprof.
(Nick Barnes, review by Jacques-Henri Jourdan
and Guillaume Munch-Maccagnoni).
- #12430: Simplify dynamic bytecode loading in Meta.reify_bytecode
(Stephen Dolan, review by Sébastien Hinderer, Vincent Laviron and Xavier
Leroy)
- #12489: Fix an error-handling bug in caml_alloc_sprintf
(Stephen Dolan, report by Chris Casinghino, review by Jeremy Yallop
and Xavier Leroy)
- #11307: Finish adapting the implementation of asynchronous actions for
multicore: soundness, liveness, and performance issues.
Do not crash if a signal handler is called from an unregistered C
thread, and other possible soundness issues. Prevent issues where join
on other domains could make the toplevel unresponsible to Ctrl-C. Avoid
needless repeated polling in C code when callbacks cannot run
immediately.
(Guillaume Munch-Maccagnoni, review by Enguerrand Decorne, Xavier
Leroy, and KC Sivaramakrishnan)
- #12634: Simplify TSan backtrace bookkeeping upon raise
(Olivier Nicole and Fabrice Buoro, review by Gabriel Scherer)
* #12686: Some primitives had the wrong types to be callable from the bytecode
interpreter. Either fix their types, mark them as `CAMLexport` instead of
`CAMLprim`, or remove them entirely if no longer used.
(Xavier Leroy, review by David Allsopp)
- #12700, continuing #11763 and trying to address #12660:
Use the correct types for primitives when generating the table of primitives
used by ocamlrun.
(Xavier Leroy, motivation, review and improvements by Antonin Décimo)
- #12345, #12710: Fix issues with finaliser orphaning at domain termination
(KC Sivaramakrishnan, report by Gabriel Scherer, review by Gabriel Scherer,
Sadiq Jaffer and Fabrice Buoro)
- #12599: Refactor Dynlink startup to avoid parsing bytecode sections twice
(Stephen Dolan, review by David Allsopp, Hugo Heuzard, Damien Doligez and
Xavier Leroy)
- #12678, #12898: free channel buffers on close rather than on finalization
(Damien Doligez, review by Jan Midtgaard and Gabriel Scherer, report
by Jan Midtgaard)
- #12681: Fix TSan false positives due to volatile write handling
(Olivier Nicole, Fabrice Buoro and Anmol Sahoo, review by Luc Maranget,
Gabriel Scherer, Hernan Ponce de Leon and Xavier Leroy)
- #12743: Use pthread_sigmask instead of sigprocmask
Updates usage of sigprocmask to pthread_sigmask in otherlibs/unix.
(Max Slater, review by Miod Vallat and Xavier Leroy)
- #12769: Unify MSVC and MinGW-w64 code paths, by always using WinAPI
directly.
(David Allsopp, Antonin Décimo, and Samuel Hym, review by Nicolas
Ojeda Bar)
- #11911, #12382, #12383: Restore statmemprof functionality in part
(backtrace buffers, per-thread and per-domain data structures,
GC/allocation interface). (Nick Barnes, review by Gabriel Scherer,
Fabrice Buoro, Sadiq Jaffer, Guillaume Munch-Maccagnoni, and
Jacques-Henri Jourdan).
- #12735: Store both ends of the stack chain in continuations
(Leo White, review by Miod Vallat and KC Sivaramakrishnan)
- #12746: Simplify and clean up TSan annotations
(Olivier Nicole, review by Miod Vallat and Fabrice Buoro)
- #12809: Add ThreadSanitizer support to FreeBSD/amd64
(Miod Vallat, review by Gabriel Scherer)
- #12810: Port ThreadSanitizer support to Linux and macOS on arm64
(Miod Vallat, review by Tim McGilchrist)
- #12811: Define and use the CAMLthread_local macro for TLS variables.
(Antonin Décimo and Samuel Hym, review by Miod Vallat and Xavier Leroy)
- #12814: More detailed failure messages from `input_value` and `Marshal.from_*`
(Xavier Leroy, review by Stephen Dolan and Anil Madhavapeddy)
- #12815: Correctly format multi-line locations in exception backtraces, in the
style that the compiler driver uses.
(David Allsopp, review by Gabriel Scherer)
- #12773, #12830, #12834: Rewrite `caml_c_thread_(un)register` to fix
various bugs.
(Guillaume Munch-Maccagnoni, reported by Miod Vallat, suggested by
Hari Hara Naveen S, reviewed by Fabrice Buoro, Gabriel Scherer and
Miod Vallat)
- #12876: Port ThreadSanitizer support to Linux on POWER
(Miod Vallat, review by Tim McGilchrist)
- #12886: Reinitialize IO mutexes after fork
(Max Slater, review by Guillaume Munch-Maccagnoni and Xavier Leroy)
- #12907: Port ThreadSanitizer support to Linux on RiscV
(Miod Vallat, review by Nicolás Ojeda Bär and Fabrice Buoro)
- #12915: Port ThreadSanitizer support to Linux on s390x
(Miod Vallat, review by Tim McGilchrist)
- #12934: Fix data races between marking and sweeping functions
(Olivier Nicole, suggested by Stephen Dolan, review by Gabriel Scherer,
Miod Vallat and Damien Doligez)
### Code generation and optimizations:
- #11239: on x86-64 and RISC-V, reduce alignment of OCaml stacks from 16 to 8.
This reduces stack usage. It's only C stacks that require 16-alignment.
(Xavier Leroy, review by Gabriel Scherer and Stephen Dolan)
- #12311: on POWER, 32-bit FP numbers stored in memory (e.g. in bigarrays)
were not correctly rounded sometimes.
(Xavier Leroy, review by Anil Madhavapeddy and Tim McGilchrist)
- #12551, #12608, #12782, #12596: Overhaul of recursive value compilation.
Non-function recursive bindings are now forbidden from Lambda onwards,
and compiled using a new Value_rec_compiler module.
(Vincent Laviron and Lunia Ayanides, review by Gabriel Scherer,
Stefan Muenzel and Nathanaëlle Courant)
- #1809, #12181: rewrite `compare x y op 0` to `x op y` when values are integers
(Xavier Clerc, Stefan Muenzel, review by Gabriel Scherer and Vincent Laviron)
- #12825: disable common subexpression elimination for atomic loads... again.
(Gabriel Scherer, review by KC Sivaramakrishnan, Xavier Leroy
and Vincent Laviron, report by Vesa Karvonen)
### Standard library:
- #12716: Add `Format.pp_print_nothing` function.
(Léo Andrès, review by Gabriel Scherer and Nicolás Ojeda Bär)
- #11563: Add the Dynarray module to the stdlib. Dynamic arrays are
arrays whose length can be changed by adding or removing elements at
the end, similar to 'vectors' in C++ or Rust.
(Gabriel Scherer, Simon Cruanes and Florian Angeletti, review by
Daniel Bünzli, Guillaume Munch-Maccagnoni, Clément Allain,
Damien Doligez, Wiktor Kuchta and Pieter Goetschalckx)
* #6732, #12423: Make Buffer.add_substitute surjective and fix its
documentation.
(Damien Doligez, review by Antonin Décimo)
* #10775, #12499: Half-precision floating-point elements in Bigarray.
(Anton Yabchinskiy, review by Xavier Leroy and Nicolás Ojeda Bär)
- #11517, #12477: Expose pp_infinity in interface of the format module, and
check that margin is less than pp_infinity when setting or checking geometry.
(Janith Petangoda, reported by Simmo Saan, reviewed by Florian Angeletti,
Simmo Saan, Josh Berdine and Gabriel Scherer)
- #12217: Add `Array.shuffle`.
(Daniel Bünzli, review by Nicolás Ojeda Bär, David Allsopp and Alain Frisch)
- #12212: Add cache-aligned constructor for atomics. The patch ensures that
all allocations (of the right size) in the shared heap are aligned.
(Bartosz Modelski with Gabriel Scherer, Guillaume Munch-Maccagnoni,
Xavier Leroy, review by Alain Frisch, Anil Madhavapeddy, Gabriel Scherer,
Guillaume Munch-Maccagnoni, KC Sivaramakrishnan, Stefan Muenzel,
Xavier Leroy)
- #12307: Add BLAKE2b hashing and an MD5 submodule to the Digest module.
(Xavier Leroy, review by Olivier Nicole, Gabriel Scherer, Wiktor Kuchta,
Daniel Bünzli, David Allsopp)
- #12365: Add In_channel.input_bigarray, In_channel.really_input_bigarray,
Out_channel.output_bigarray, Unix.read_bigarray, Unix.write_bigarray,
Unix.single_write_bigarray.
(Nicolás Ojeda Bär, review by Jeremy Yallop, Xavier Leroy, Gabriel Scherer,
David Allsopp)
- #12455: Add `Array.init_matrix`, `Float.Array.make_matrix`,
`Float.Array.init_matrix`.
(Glen Mével, review by Xavier Leroy, Gabriel Scherer, Jeremy Yallop,
Nicolas Ojeda Bar)