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<h3 style="margin-top: 20px; margin-bottom: 10px;">
Andreas Klebinger pushed to branch ghc-9.10 at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4 style="margin-top: 10px; margin-bottom: 10px;">
Commits:
</h4>
<ul>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8cb44392fffe26bfa60e39a1b1d5600bd4d5837d">8cb44392</a></strong>
<div>
<span> by Matthew Craven </span> <i> at 2024-12-09T13:36:25+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Remove unused ghc-internal module "GHC.Internal.Constants"
(cherry picked from commit c6c190718972330504c048b013e5c2596b3c0c1e)
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c16c0deabcc7e6ac6e9b4f94883cff9b9df0d6dd">c16c0dea</a></strong>
<div>
<span> by Matthew Craven </span> <i> at 2024-12-09T14:25:07+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>CorePrep: Rework lowering of BigNat# literals
Don't use bigNatFromWord#, because that's terrible:
* We shouldn't have to traverse a linked list at run-time
to build a BigNat# literal. That's just silly!
* The static List object we have to create is much larger
than the actual BigNat#'s contents, bloating code size.
* We have to read the corresponding interface file,
which causes un-tracked implicit dependencies. (#23942)
Instead, encode them into the appropriate platform-dependent
sequence of bytes, and generate code that copies these bytes
at run-time from an Addr# literal into a new ByteArray#.
A ByteArray# literal would be the correct thing to generate,
but these are not yet supported; see also #17747.
Somewhat surprisingly, this change results in a slight
reduction in compiler allocations, averaging around 0.5%
on ghc's compiler performance tests, including when compiling
programs that contain no bignum literals to begin with.
The specific cause of this has not been investigated.
Since this lowering no longer reads the interface file for
GHC.Num.BigNat, the reasoning in Note [Depend on GHC.Num.Integer]
is obsoleted. But the story of un-tracked built-in dependencies
remains complex, and Note [Tracking dependencies on primitives]
now exists to explain this complexity.
Additionally, many empty imports have been modified to refer to
this new note and comply with its guidance. Several empty imports
necessary for other reasons have also been given brief explanations.
Metric Decrease:
MultiLayerModulesTH_OneShot
(cherry picked from commit 6d8f274b8677fcf9519d569875145f9f5434d779)
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b3c9d2498a276dcfdc022602da7fbad7bb4a5e4">0b3c9d24</a></strong>
<div>
<span> by Andreas Klebinger </span> <i> at 2024-12-09T14:27:39+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Add changelog entry for BigNat# lowering changes.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53d78e3520d8c35c738839888e73b78b6a99cef3">53d78e35</a></strong>
<div>
<span> by Fendor </span> <i> at 2024-12-09T17:11:34+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Replace `SizedSeq` with `FlatBag` for flattened structure
LinkedLists are notoriously memory ineffiecient when all we do is
traversing a structure.
As 'UnlinkedBCO' has been identified as a data structure that impacts
the overall memory usage of GHCi sessions, we avoid linked lists and
prefer flattened structure for storing.
We introduce a new memory efficient representation of sequential
elements that has special support for the cases:
* Empty
* Singleton
* Tuple Elements
This improves sharing in the 'Empty' case and avoids the overhead of
'Array' until its constant overhead is justified.
(cherry picked from commit 5f085d3af61e3f7a73652dfc1ae57e7ed7d691f2)
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d4cf1dc766378631f93a4ebfe8ef633bb4650ec5">d4cf1dc7</a></strong>
<div>
<span> by Fendor </span> <i> at 2024-12-09T17:11:34+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Compact FlatBag array representation
`Array` contains three additional `Word`'s we do not need in `FlatBag`. Move
`FlatBag` to `SmallArray`.
Expand the API of SmallArray by `sizeofSmallArray` and add common
traversal functions, such as `mapSmallArray` and `foldMapSmallArray`.
Additionally, allow users to force the elements of a `SmallArray`
via `rnfSmallArray`.
(cherry picked from commit 82cfe10c8c3ec68e1b054e2d6b88e1a8830c60bf)
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a90fac713d5de3605db8e09a95f419520e944906">a90fac71</a></strong>
<div>
<span> by Fendor </span> <i> at 2024-12-09T17:11:34+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Avoid UArray when indexing is not required
`UnlinkedBCO`'s can occur many times in the heap. Each `UnlinkedBCO`
references two `UArray`'s but never indexes them. They are only needed
to encode the elements into a `ByteArray#`. The three words for
the lower bound, upper bound and number of elements are essentially
unused, thus we replace `UArray` with a wrapper around `ByteArray#`.
This saves us up to three words for each `UnlinkedBCO`.
Further, to avoid re-allocating these words for `ResolvedBCO`, we repeat
the procedure for `ResolvedBCO` and add custom `Binary` and `Show` instances.
For example, agda's repl session has around 360_000 UnlinkedBCO's,
so avoiding these three words is already saving us around 8MB residency.
(cherry picked from commit 88cb3e1079e88ba10065ce260a96095ae96d58e8)
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/68a1c9dd793e5dc4dfe94c5da1eef853d92a7622">68a1c9dd</a></strong>
<div>
<span> by Andreas Klebinger </span> <i> at 2024-12-09T17:11:34+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Changelog for !12170 and !12142
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/73f25e46cebaefb5ed91efd2e8f05dba087d5b8a">73f25e46</a></strong>
<div>
<span> by Rodrigo Mesquita </span> <i> at 2024-12-09T17:11:34+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>rts: free error message before returning
Fixes a memory leak in rts/linker/PEi386.c
(cherry picked from commit dd530bb7e22e953e4cec64a5fd6c39fddc152c6f)
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c9979feda8a2c94f4d3826b35c0280f9644f17f8">c9979fed</a></strong>
<div>
<span> by Alexis King </span> <i> at 2024-12-09T17:11:34+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>linker: Avoid linear search when looking up Haskell symbols via dlsym
See the primary Note [Looking up symbols in the relevant objects] for a
more in-depth explanation.
When dynamically loading a Haskell symbol (typical when running a splice or
GHCi expression), before this commit we would search for the symbol in
all dynamic libraries that were loaded. However, this could be very
inefficient when too many packages are loaded (which can happen if there are
many package dependencies) because the time to lookup the would be
linear in the number of packages loaded.
This commit drastically improves symbol loading performance by
introducing a mapping from units to the handles of corresponding loaded
dlls. These handles are returned by dlopen when we load a dll, and can
then be used to look up in a specific dynamic library.
Looking up a given Name is now much more precise because we can get
lookup its unit in the mapping and lookup the symbol solely in the
handles of the dynamic libraries loaded for that unit.
In one measurement, the wait time before the expression was executed
went from +-38 seconds down to +-2s.
This commit also includes Note [Symbols may not be found in pkgs_loaded],
explaining the fallback to the old behaviour in case no dll can be found
in the unit mapping for a given Name.
Fixes #23415
Co-authored-by: Rodrigo Mesquita (@alt-romes)
(cherry picked from commit e008a19a7f9e8f22aada0b4e1049744f49d39aad)
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b663c9e0764d148378c321a9a385bf9b2f81a5c2">b663c9e0</a></strong>
<div>
<span> by Rodrigo Mesquita </span> <i> at 2024-12-09T17:11:34+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>rts: Make addDLL a wrapper around loadNativeObj
Rewrite the implementation of `addDLL` as a wrapper around the more
principled `loadNativeObj` rts linker function. The latter should be
preferred while the former is preserved for backwards compatibility.
`loadNativeObj` was previously only available on ELF platforms, so this
commit further refactors the rts linker to transform loadNativeObj_ELF
into loadNativeObj_POSIX, which is available in ELF and MachO platforms.
The refactor made it possible to remove the `dl_mutex` mutex in favour
of always using `linker_mutex` (rather than a combination of both).
Lastly, we implement `loadNativeObj` for Windows too.
(cherry picked from commit dcfaa190e1e1182a2efe4e2f601affbb832a49bb)
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/67890fdb913ce69a8beb2b2600fba079d07944bf">67890fdb</a></strong>
<div>
<span> by Rodrigo Mesquita </span> <i> at 2024-12-09T17:11:34+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Use symbol cache in internal interpreter too
This commit makes the symbol cache that was used by the external
interpreter available for the internal interpreter too.
This follows from the analysis in #23415 that suggests the internal
interpreter could benefit from this cache too, and that there is no good
reason not to have the cache for it too. It also makes it a bit more
uniform to have the symbol cache range over both the internal and
external interpreter.
This commit also refactors the cache into a function which is used by
both `lookupSymbol` and also by `lookupSymbolInDLL`, extending the
caching logic to `lookupSymbolInDLL` too.
(cherry picked from commit 12931698261a1cee6a00b731d143270cd60e5f2d)
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/353b6ec1cf2b59860782092e4f9a0a303666dfdc">353b6ec1</a></strong>
<div>
<span> by Ben Gamari </span> <i> at 2024-12-09T17:11:34+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>testsuite: Add test for lookupSymbolInNativeObj
(cherry picked from commit dccd3ea159b03cc1972cf47ee3cf8bda73ec0c5a)
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/920ccafc6c046e72aad73e03530c947c9c40126d">920ccafc</a></strong>
<div>
<span> by Andreas Klebinger </span> <i> at 2024-12-09T17:11:34+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Changelog for !12264 (Lookup symbols in relevant DLLs only)
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/99399b92e6c1f1c149724e6b96cb532e3f728438">99399b92</a></strong>
<div>
<span> by Andreas Klebinger </span> <i> at 2024-12-09T17:12:58+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>NCG: Fix a bug where we errounously removed a required jump instruction.
Add a new method to the Instruction class to check if we can eliminate a
jump in favour of fallthrough control flow.
Fixes #24507
(cherry picked from commit 0fe2b410ac0d8951f07ffcc9f3c6c97bc312df48)
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ea0d4f74618fbf37b92a0e6a3648f53f6128a23">6ea0d4f7</a></strong>
<div>
<span> by Andreas Klebinger </span> <i> at 2024-12-09T17:13:42+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Add changelog for !12370 - Bug in jump shortcutting.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8692ced58b31a11c462f106e91eaa3e4733e806b">8692ced5</a></strong>
<div>
<span> by Simon Peyton Jones </span> <i> at 2024-12-09T17:18:17+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Don't generate wrappers for `type data` constructors with StrictData
Previously, the logic for checking if a data constructor needs a wrapper or not
would take into account whether the constructor's fields have explicit
strictness (e.g., `data T = MkT !Int`), but the logic would _not_ take into
account whether `StrictData` was enabled. This meant that something like `type
data T = MkT Int` would incorrectly generate a wrapper for `MkT` if
`StrictData` was enabled, leading to the horrible errors seen in #24620. To fix
this, we disable generating wrappers for `type data` constructors altogether.
Fixes #24620.
Co-authored-by: Ryan Scott <ryan.gl.scott@gmail.com>
(cherry picked from commit 5e4f4ba835fd24135759ee7a2d0d5c636a8a1505)
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c52e80475f80bf1734a2ada7665b308544b75cd7">c52e8047</a></strong>
<div>
<span> by Andreas Klebinger </span> <i> at 2024-12-09T17:19:50+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Changelog for !12416
Entry for "Don't generate wrappers for `type data` constructors with StrictData."
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8e13b22ed5229c45a735c06bb3c838bc577d30c3">8e13b22e</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2024-12-09T17:21:24+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Linearise ghc-internal and base build
This is achieved by requesting the final package database for
ghc-internal, which mandates it is fully built as a dependency of
configuring the `base` package. This is at the expense of cross-package
parrallelism between ghc-internal and the base package.
Fixes #24436
(cherry picked from commit 8a06ddf68bb5a9985e3a7b8464dd04b928c36b90)
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/220f15b278acb09433b529cf91c10fc756f6e67e">220f15b2</a></strong>
<div>
<span> by Andreas Klebinger </span> <i> at 2024-12-12T15:19:22+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Accept backport metric changes.
The MLM test regresses slightly (+2.5% compiler bytes allocated).
That seems within reason.
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Metric Increase:
MultiLayerModulesTH_OneShot
-------------------------
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