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<h3 style="margin-top: 20px; margin-bottom: 10px;">
Matthew Pickering pushed to branch wip/underflow-lookups 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/e22a14fc163552a257ee2273b35dd42f665066c5">e22a14fc</a></strong>
<div>
<span> by Simon Peyton Jones </span> <i> at 2025-02-11T16:21:10+00:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Deal correctly with Given CallStack constraints
As #25675 showed, the CallStack solving mechanism was failing
to account for Given CallStack constraints.
This small patch fixes it and improves the Notes.
Small improvement to GHCi debugger output in break011, break024,
which is discussed on the MR !13883
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/db3e810f32804ab9171a7f6b74a95480ded7011a">db3e810f</a></strong>
<div>
<span> by Simon Peyton Jones </span> <i> at 2025-02-12T09:12:30-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Fix inlineBoringOk again
This MR fixes #25713, which turned out to be a consequence of not
completing #17182.
I think I have now gotten it right. See the new
Note [inlineBoringOk]
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ef0e6cfc4e348a8c598578052c5b24e2d685e91c">ef0e6cfc</a></strong>
<div>
<span> by Ben Gamari </span> <i> at 2025-02-17T19:20:09-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>testsuite: Mark T23071 and T2047 as fragile on FreeBSD
These inexplicably fail on FreeBSD on CI. Sadly I am unable to reproduce
this locally but regardless this is holding up Marge so I will mark them
as fragile for now.
Addresses #25751.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7596675e470699f6184e13c08b268972028bc868">7596675e</a></strong>
<div>
<span> by Jens Petersen </span> <i> at 2025-02-18T08:53:08-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>hp2ps Utilities.c: include stdlib.h instead of extern malloc and realloc
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/975d932cb4cadecd879660fbcf845e6ba9ac2a52">975d932c</a></strong>
<div>
<span> by Rodrigo Mesquita </span> <i> at 2025-02-18T08:53:45-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Inline join points for rhs without free vars
While investigating #25170, we ran into a program (T16473) that allocated 67%
more because of a join point that failed to inline.
Note [Duplicating join points] explains why we want to be conservative
when inlining join points, using as an example a join point that
captures a free variable `f` that becomes available in the continuation
`blah` for further optimisations, as opposed to being lambda-abstracted.
However, when the RHS of the join point has no free variables and is
trivial, the same argument does not apply, and there's nothing to gain
from preserving it.
On the contrary, not inlining these trivial join points such as
$j f x = K f x |> co
can be actively harmful as they prevent useful optimisations from firing
on the known constructor application. #25723 is such an example.
Therefore, we've extended `uncondInlineJoin` to allow duplicating such closed
trivial join points. See the updated Note [Duplicating join points] for
further details.
Additionally, merge the guards in uncondInlineJoin for point DJ3(b) anad DJ3(c) of
Note [Duplicating join points] to avoid an unnecessary traversal in the
call to `collectArgs`; it's also more uniform.
Co-authored-by: Simon Peyton Jones <simon.peytonjones@gmail.com>
Fixes #25723
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/78de1a55fe86d5c10ae6c71c68c53b786cf90d9a">78de1a55</a></strong>
<div>
<span> by M Farkas-Dyck </span> <i> at 2025-02-18T08:54:31-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Scrub some partiality in `GHC.Tc.Gen.Match`.
In particular, we construct a list of the same length as another list, then loop over both and panic if their lengths are unequal. We can avoid this.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1dfe93253f8d96aa224a1eda7f5de201edf71a04">1dfe9325</a></strong>
<div>
<span> by M Farkas-Dyck </span> <i> at 2025-02-18T08:54:31-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Make list of `ParStmtBlock` in `ParStmt` `NonEmpty`.
In the ParStmt constructor Language.Haskell.Syntax.Expr.StmtLR, the 2nd argument, the list of ParStmtBlocks, must be NonEmpty; make it so.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e3575b5410b9fc2341c17451d8c616ebbe81721">0e3575b5</a></strong>
<div>
<span> by M Farkas-Dyck </span> <i> at 2025-02-18T08:54:31-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>GHC.Tc.Gen.Match: Added type signatures for `loop` functions.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c9ffcfeec2da8abee9456cd7c64e7c51fd01635e">c9ffcfee</a></strong>
<div>
<span> by sternenseemann </span> <i> at 2025-02-18T08:55:14-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>GHC: fix reference to function in Note [Target code interpreter]
As far as I could tell, setSessionDynFlags doesn't deal with hsc_interp.
Also added a backreference so this will be updated in the future.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ab77fc8c7adebd610aa0bd99d653f9a6cc78a374">ab77fc8c</a></strong>
<div>
<span> by sheaf </span> <i> at 2025-02-18T08:55:57-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Account for skolem escape in mightEqualLater
This commit:
1. Refactors checkTyEqRhs to allow it be called in pure contexts,
which means it skips doing any on-the-fly promotion.
2. Calls checkTyEqRhs in mightEqualLater to check whether it a
MetaTv can unify with a RHS or whether that would cause e.g.
skolem escape errors or concreteness errors.
Fixes #25744
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cb8a06a4d978196c88c30f096fa15020cf33c96f">cb8a06a4</a></strong>
<div>
<span> by Sylvain Henry </span> <i> at 2025-02-18T08:56:52-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Remove a bunch of Makefiles from old build system
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e12d6b3961adfa8cbb42d40262a1ee5cfaceb609">e12d6b39</a></strong>
<div>
<span> by M Farkas-Dyck </span> <i> at 2025-02-18T08:57:37-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Totalize `GHC.HsToCore.Match.matchWrappers.initNablasGRHSs`.
Converting from `NonEmpty` to `[]` and back is totally needless.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd2be3bec6ac1df225a556ab2077189c39b21012">cd2be3be</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2025-02-18T08:58:14-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>interpreter: Always print uniques for BCO_NAME labels
In the previous commit I omitted to include the unique, which still
makes it very difficult to trace back where the BCO came from.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c4e112fccd10ca745771dd81d2c1eb340aa8dd86">c4e112fc</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2025-02-18T08:58:51-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>interpreter: Fix overflows and reentrancy in statistics calculation
1. Use unsigned long for counter, as they can easily overflow if you are
running a long benchmark.
2. Make interp_shutdown reentrant by copying the command frequency table
into an array.
Fixes #25756
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70ac6222a7285ecc6324097a68ba228664704e10">70ac6222</a></strong>
<div>
<span> by M Farkas-Dyck </span> <i> at 2025-02-18T14:22:06-08:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Use `Foldable1` where appropriate, avoiding much needless panicking.
In some cases, where not readily feasible to modify code to use `NonEmpty`, merely use `expectNonEmpty` to make explicit we are panicking if we have an empty list.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a3f0a506040376a4910f799494bc23a56e1b6bdd">a3f0a506</a></strong>
<div>
<span> by Sylvain Henry </span> <i> at 2025-02-19T05:27:30-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Testsuite: fix deprecation warning
> DeprecationWarning: 'count' is passed as positional argument
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ef5470a226dd8fe84df500a6a68672548624559e">ef5470a2</a></strong>
<div>
<span> by Ben Gamari </span> <i> at 2025-02-19T16:30:53+00:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Cmm/Parser: Add surface syntax for Mul2 MachOps
These are otherwise very hard to test in isolation.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/59b9307b239f0e1058ccc90ca2fadb86552c0308">59b9307b</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2025-02-19T20:24:40-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>testsuite: fix InternalCounters test with +debug_ghc
The `InternalCounters` test case fails when ghc is built with
`+debug_ghc`. This patch skips it in that case and allows the
testsuite to pass for the `+debug_ghc` flavour transformer.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa69187d45a5697507c1c609cebe15113c20f452">aa69187d</a></strong>
<div>
<span> by M Farkas-Dyck </span> <i> at 2025-02-19T20:25:31-05:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Scrub a use of `head` in `GHC.Driver.Make.downsweep_imports.checkDuplicates`.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e8e4b534eb0b5a3792b2b291d84a912202b44049">e8e4b534</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2025-02-20T14:17:32+00:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>interpreter: Fix underflow frame lookups
BCOs can be nested, resulting in nested BCO stack frames where the inner most
stack frame can refer to variables stored on earlier stack frames via the
PUSH_L instruction.
|---------|
| BCO_1 | -<-┐
|---------|
......... |
|---------| | PUSH_L <n>
| BCO_N | ->-┘
|---------|
Here BCO_N is syntactically nested within the code for BCO_1 and will result
in code that references the prior stack frame of BCO_1 for some of it's local
variables. If a stack overflow happens between the creation of the stack frame
for BCO_1 and BCO_N the RTS might move BCO_N to a new stack chunk while leaving
BCO_1 in place, invalidating a simple offset based reference to the outer stack
frames.
Therefore `ReadSpW` first performs a bounds check to ensure that accesses onto
the stack will succeed. If the target address would not be a valid location for
the current stack chunk then `slow_spw` function is called, which dereferences
the underflow frame to adjust the offset before performing the lookup.
┌->--x | CHK_1 |
| CHK_2 | | | |---------|
|---------| | └-> | BCO_1 |
| UD_FLOW | -- x |---------|
|---------| |
| ...... | |
|---------| | PUSH_L <n>
| BCO_ N | ->-┘
|---------|
Fixes #25750
</pre>
</li>
</ul>
<h4 style="margin-top: 10px; margin-bottom: 10px;">
110 changed files:
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