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Working version
_______________
(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:
- 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:
- #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).
- #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)
- #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)
### 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: fix a soundness bug in the
pattern-matching compiler when side-effects mutate the scrutinee
during matching.
Note that #7241 is not fully fixed yet, see the issue for the
current status.
(Gabriel Scherer, review by Nick Roberts)
### Standard library:
- #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)
### Other libraries:
### 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:
- #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)
### 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)
- #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)
### 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)
- #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)
- #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)
- #13193: Remove the unused env_init field from class blocks
(Vincent Laviron, review by Jacques Garrigue)
### 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)
### 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)
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)
### 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)
* #12455: `Array.make_matrix dimx dimy f` now raises `Invalid_argument`
when `dimx = 0 && dimy < 0` This was already specified but not enforced.
(Glen Mével, report by Jeremy Yallop, review by Nicolas Ojeda Bar)
- #12459: Add `Random.int_in_range`, `Random.int32_in_range`,
`Random.int64_in_range`, `Random.nativeint_in_range`,
and their counterpart in `Random.State`.
(Glen Mével and Xavier Leroy, review by Gabriel Scherer, Xavier Leroy,
Florian Angeletti)
- #12459: `Random`: restore compatibility between 32-bit integers (JavaScript)
and 63-bit integers (64-bit OCaml).
For `Random.full_int` this was guaranteed in 4.14 but wrongly removed in 5.0.
(Xavier Leroy, review by Glen Mével)
- #12511: Minor performance improvements and cleanups in the implementation
of modules Int32, Int64, and Nativeint
(Xavier Leroy, review by Gabriel Scherer and Daniel Bünzli)
- #12558: Adapt GC alarms for multicore and fix their documentation.
(Guillaume Munch-Maccagnoni, review by KC Sivaramakrishnan
and Gabriel Scherer)
- #12625: Remove the Closure module from Obj
(Vincent Laviron, review by Xavier Leroy)
- #12758, #12998: Remove the `Marshal.Compression` flag to the
`Marshal.to_*` functions. The compilers are still able to use
ZSTD compression for compilation artefacts.
This is a forward port and clean-up of the emergency fix that was introduced
in OCaml 5.1.1 by #12734.
(Xavier Leroy, review by Damien Doligez)
- #12784: Fix computation of minor-heap allocation in Gc.counters()
and Gc.allocated_bytes(). (Nick Barnes, review by Gabriel Scherer)
- #12770: Add `Fun.compose`.
(Justin Frank, review by Nicolás Ojeda Bär, Daniel Bünzli and Jeremy Yallop)
- #12845: Add `{In,Out}_channel.is_binary_mode` as the dual of
`set_binary_mode`. This function was previously only available in the internal
C API.
(David Allsopp, review by Nicolás Ojeda Bär and Xavier Leroy)
### Other libraries:
- #12213: Dynlink library, improve legibility of error messages
(Samuel Hym, review by Gabriel Scherer and Nicolás Ojeda Bär)
* #12686: Runtime_events library, C API: define
`caml_runtime_events_{start,pause,resume}` as returning `void`
instead of `value`.
(Xavier Leroy, review by David Allsopp)
### Tools:
- #12340: testsuite: collect known issues with current -short-paths
implementation for existential types
(Florian Angeletti, Samuel Hym, review by Florian Angeletti and Thomas Refis)
- #12147: ocamllex: Allow carriage returns at the end of line directives.
(SeungCheol Jung, review by Nicolás Ojeda Bär)
- #12260: Fix invalid_argument on some external or module aliases in ocamlnat
(Fabian Hemmer, review by Vincent Laviron)
- #12185: New script language for ocamltest.
(Damien Doligez with Florian Angeletti, Sébastien Hinderer, Gabriel Scherer,
review by Sébastien Hinderer and Gabriel Scherer)
- #12371: ocamltest: fix recursive expansion of variables.
(Antonin Décimo, Damien Doligez, review by Sébastien Hinderer,
Damien Doligez, Gabriel Scherer, and Xavier Leroy)
* #12497, #12613: Make ocamlc/ocamlopt fail with an error when no
input files are specified to build an executable.
(Antonin Décimo, review by Sébastien Hinderer)
- #12576: ocamldep: various refactors.
(Antonin Décimo, review by Florian Angeletti, Gabriel Scherer, and Léo Andrès)
- #12615: ocamldoc: get rid of the odoc_literate and odoc_todo generators.
(Sébastien Hinderer, review by Gabriel Scherer and Florian Angeletti)
- #12624: Use $XDG_CONFIG_DIRS in addition to $XDG_CONFIG_HOME when searching
for init.ml and use this to extend init.ml support to the toplevel when
running on Windows.
(David Allsopp, report by Jonah Beckford, review by Nicolás Ojeda Bär and
Antonin Décimo)
- #12688: Setting the env variable `NO_COLOR` with an empty value no longer
has effects. Previously, setting `NO_COLOR` with any value, including
the empty value, would disable colors (unless `OCAML_COLOR` is also set).
After this change, the user must set `NO_COLOR` with an non-empty value
to disable colors. This reflects a specification clarification/change
from the upstream website at https://no-color.org.
(Favonia, review by Gabriel Scherer)
- #12744: ocamltest: run tests in recursive subdirs more eagerly
(Nick Roberts, review by Nicolás Ojeda Bär)
- #12901, 12908: ocamllex: add overflow checks to prevent generating incorrect
lexers; use unsigned numbers in the table encoding when possible.
(Vincent Laviron, report by Edwin Török, review by Xavier Leroy)
### Manual and documentation:
- #12338: clarification of the documentation of process related function in
the unix module regarding the first element of args and shell's pid.
(Christophe Raffalli, review by Florian Angeletti)
- #12473: Document in runtime/memory.c our current understanding of
accesses to the OCaml heap from the C runtime code -- the problem
of hybrid programs mixing two memory models.
(Gabriel Scherer and Guillaume Munch-Maccagnoni, review by Olivier
Nicole and Xavier Leroy)
- #12694: Document in runtime/tsan.c the TSan instrumentation choices and the
consequences with regard to the memory model.
(Olivier Nicole, review by Miod Vallat, Gabriel Scherer, Guillaume
Munch-Maccagnoni and Fabrice Buoro)
- #12802: Add manual chapter about ThreadSanitizer support
(Olivier Nicole, review by Miod Vallat, Sebastien Hinderer, Fabrice Buoro,
Gabriel Scherer and KC Sivaramakrishnan)
- #12819: Clarify which runtime interactions are allowed in custom ops
(Basile Clément, review by Guillaume Munch-Maccagnoni and Xavier Leroy)
- #12840: manual: update runtime tracing chapter for custom events (ex #12335)
(Lucas Pluvinage, Sadiq Jaffer and Olivier Nicole, review by Gabriel Scherer,
David Allsopp, Tim McGilchrist and Thomas Leonard)
- #13066, update OCAMLRUNPARAM documentation for the stack size parameter l
(Florian Angeletti, review by Nicolás Ojeda Bär, Tim McGilchrist, and
Miod Vallat)
- #13078: update Format tutorial on structural boxes to mention alignment
questions.
(Edwin Török, review by Florian Angeletti)
- #13092: document the existence of the `[@@poll error]` built-in attribute
(Florian Angeletti, review by Gabriel Scherer)
### Compiler user-interface and warnings:
* #10613, #12405: Simplify the values used for the system variable (`system:` in
`ocamlopt -config` or the `Config.system` constant). In particular, s390x and
ppc64 now report "linux" instead of "elf"; all variants of 32-bit ARM on Linux
now report "linux"; OpenBSD now reports "openbsd" instead of "bsd" for 32-bit
ARM; FreeBSD, NetBSD and OpenBSD now report the same value for both x86_64 and
x86_32; x86_32 systems matching *bsd but not freebsd*, netbsd* or openbsd*
are no longer identified (as on x86_64); x86_32 Linux now reports "linux"
instead of "linux_elf".
(David Allsopp, request by Kate Deplaix, review by Sébastien Hinderer and
Xavier Leroy)
- #11989, #12246, RFC 31: New flag, -H, to allow for transitive dependencies
without including them in the initial environment.
(Chris Casinghino, François Bobot, and Gabriel Scherer, review by Leo White
and Stefan Muenzel, RFC by François Bobot)
- #12247: configure: --disable-ocamldebug can now be used instead
of --disable-debugger (which remains available for compatibility)
(Gabriel Scherer, review by Damien Doligez and Sébastien Hinderer)
- #12199: improve the error message for non-overriding `inherit!`
(Florian Angeletti, review by Jules Aguillon)
- #12210: uniform style for inline code in compiler messages
(Florian Angeletti, review by Gabriel Scherer)
* #12278, #:12325: Remove the OCAML_FLEXLINK environment variable from the
compiler drivers. This environment variable was previously used as part of the
FlexDLL bootstrap procedure and existed solely for that purpose. Its removal
greatly simplifies both the build system and testsuite machinery.
(David Allsopp, review by Sébastien Hinderer)
- #12347: error messages: always report missing polyvariant tags
(Florian Angeletti, report by Tianbo Hao, review by Gabriel Scherer)
- #12224, specialized error message when trying to apply non-functor
module (e.g `module M = Int(Int)`)
(Florian Angeletti, review by Gabriel Scherer)
- #12451: Warning 53 (misplaced attributes) now works for all attributes.
(Chris Casinghino, review by Florian Angeletti)
- #12622: Give hints about existential types appearing in error messages
(Leo White, review by Gabriel Scherer and Florian Angeletti)
- #12671: When a class type parameter or class parameter does not match,
identify which parameter in the error message, instead of saying
"A type parameter" or "A parameter".
(Stefan Muenzel, review by Gabriel Scherer)
- #12679: Add more detail to the error message and manual in case of
invalid module type substitutions.
(Stefan Muenzel, review by Gabriel Scherer and Florian Angeletti)
- #12750: Display the command executed to extract primitives in
`ocamlc -verbose`.
(David Allsopp, review by Nicolás Ojeda Bär)
- #12777: Add details about the actual and expected method types to the method
mismatch error messages.
(Javier Chávarri, review by Gabriel Scherer and Florian Angeletti)
* #12942: Fix an line ordering in some module inclusion error messages
(Nick Roberts, review by Florian Angeletti, report by Carl Eastlund)
### Internal/compiler-libs changes:
- #12639: parsing: Attach a location to the RHS of Ptyp_alias
and improve the 'alias type mismatch' error message.
(Jules Aguillon, review by Florian Angeletti)
- #12447: Remove 32-bit targets from X86_proc.system
(Masanori Ogino, review by David Allsopp)
- #12216, #12248: Prevent reordering of atomic loads during instruction
scheduling. This is for reference, as instruction scheduling is currently
unused in OCaml 5.
(Xavier Leroy, report by Luc Maranget and KC Sivaramakrishnan,
review by Nicolás Ojeda Bär)
- #12025: Split Typecore.unify_pat_types into two
to avoid unnecessary references to the environment in type_pat
(Jacques Garrigue and Takafumi Saikawa, review by Gabriel Scherer)
- #12031: Use dedicated types to represent names of compilation units
and predefined exceptions in CMO files.
(Sébastien Hinderer, review by Florian Angeletti, Thomas Refis,
Gabriel Scherer, Vincent Laviron, Pierre Chambart, Luke Maurer,
Hugo Heuzard, Xavier Leroy and Damien Doligez)
- #12109: Pack parameters to unification in unification_environment
(Takafumi Saikawa and Jacques Garrigue, review by Richard Eisenberg)
- #12331, #12361: Pack the unification data for pattern checking in Typecore
(Takafumi Saikawa and Jacques Garrigue,
review by Gabriel Scherer, Thomas Refis and Florian Angeletti)
- #12229: Remove global mutable state for typechecking patterns
in Typecore in favor of local mutable state.
(Nick Roberts, review by Takafumi Saikawa)
- #12236, #12386, #12391, #12496, #12673: Use syntax as sole determiner of arity
This changes function arity to be based solely on the source program's
parsetree. Previously, the heuristic for arity had more subtle heuristics
that involved type information about patterns. Function arity is important
because it determines when a pattern match's effects run and is an input
into the fast path for function application.
This change affects tooling: it changes the function constructs in parsetree
and typedtree.
See https://github.com/ocaml/RFCs/pull/32 for the original RFC.
(Nick Roberts; review by Richard Eisenberg, Leo White, and Gabriel Scherer;
RFC by Stephen Dolan)
- #12542: Minor bugfix to #12236: restore dropped call to `instance`
(Nick Roberts, review by Jacques Garrigue)
- #12242: Move the computation of stack frame parameters to a separate
`Stackframe` module, and save the parameters in the results of the
`Linearize` pass
(Xavier Leroy, review by KC Sivaramakrishnan and Mark Shinwell)
- #12442: document jump summaries in the pattern-matching compiler
(Gabriel Scherer and Thomas Refis, review by Florian Angeletti
and Vincent Laviron)
- #12446, #12792: remove the hooks machinery around channel locking
in runtime/io.c
(Gabriel Scherer, review by Xavier Leroy)
- #12389, #12544, #12984, #12987: centralize the handling of metadata for
compilation units and artifacts in preparation for better unicode support for
OCaml source files.
(Florian Angeletti, review by Vincent Laviron and Gabriel Scherer)
- #12532, #12553: improve readability of the pattern-matching debug output
(Gabriel Scherer, review by Thomas Refis)
- #12537: Use C11/C++11 standard static assertion.
(Antonin Décimo, review by Sebastien Hinderer, Xavier Leroy,
and KC Sivaramakrishnan)
- #12169: runtime: document and enforce naming conventions around STW sections.
(Gabriel Scherer, review by Enguerrand Decorne, Miod Vallat, B. Szilvasy
and Nick Barnes, report by KC Sivaramakrishnan)
- #12669 : Clean up some global state handling in schedgen
(Stefan Muenzel, review by Miod Vallat and Gabriel Scherer)
- #12640: Make the module separator used in symbol names configurable
(Miod Vallat, review by Hugo Heuzard and Xavier Leroy)
- #12691 : Clean up Ctype.expand_abbrev_gen and
rename Env.add_local_type to add_local_constraint
(Takafumi Saikawa and Jacques Garrigue, review by Florian Angeletti)
- #12786 : Clean up the algorithm of Ctype.limited_generalize
(Takafumi Saikawa and Jacques Garrigue, review by Gabriel Scherer)
- #10691: Ast_mapper, Ast_iterator: add functions directive_argument,
toplevel_directive and toplevel_phrase.
(Guillaume Petiot, review by Gabriel Scherer and Kate Deplaix)
- #12764: Move all installable headers in `caml/` sub-directories.
(Antonin Décimo, review by Gabriel Scherer and David Allsopp)
- #12508 : Add compiler-side support for project-wide occurrences in Merlin, by
generating index tables of all identifier occurrences. This extra data in .cmt
files is only added when the new flag -bin-annot-occurrences is passed.
(Ulysse Gérard, Nathanaëlle Courant, suggestions by Gabriel Scherer and Thomas
Refis, review by Florian Angeletti, Gabriel Scherer and Thomas Refis)
- #12914: Slightly change the s390x assembly dialect in order to build with
Clang's integrated assembler.
(Miod Vallat, review by Gabriel Scherer)
- #13001: do not read_back entire shapes to get aliases' uids when building the
usages index
(Ulysse Gérard, review by Gabriel Scherer and Nathanaëlle Courant)
### Build system:
- #12198, #12321, #12586, #12616, #12706, #13048: continue the merge of the
sub-makefiles into the root Makefile started with #11243, #11248,
#11268, #11420 and #11675.
(Sébastien Hinderer, review by David Allsopp and Florian Angeletti)
- #12569, #12570: remove 'otherlibraries' as a prerequisite for 'runtop';
use 'runtop-with-otherlibs' to use a library from otherlibs/
(Gabriel Scherer, review by Sébastien Hinderer, suggestion by David Allsopp)
- #12652: Make magic numbers easier to bump and duplicate.
(Sébastien Hinderer, review by Antonin Décimo, David Allsopp and Florian
Angeletti)
* #12751: --with-target-bindir configure option implemented. This option
refers to the location of the runtime binaries on the target system for a
cross-compiler and is embedded in executables produced by ocamlc. It does
not affect the bytecode executables installed as part of the build. The old
mechanism `make TARGET_BINDIR=..` no longer works.
(David Allsopp, review by Damien Doligez, Xavier Leroy and Olivier Nicole)
- #12768, #13030: Detect mingw-w64 coupling with GCC or LLVM, detect clang-cl,
and fix C compiler feature detection on macOS.
(Antonin Décimo, review by Miod Vallat and Sébastien Hinderer)
### Bug fixes:
- #10652, #12720: fix evaluation order in presence of optional arguments
(Jacques Garrigue, report by Leo White, review by Vincent Laviron)
- #12595, #12597: fix a race in `caml_clear_gc_stats_sample`