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<h3>
Ryan Scott pushed to branch wip/T18914
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/165352a2d163537afb01a835bccc7cd0a667410a">165352a2</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-11-20T02:08:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Export indexError from GHC.Ix (#18579)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b57845c3d80f5bed8f498f27fb7a318f2b2f8b2c">b57845c3</a></strong>
<div>
<span>by Kamil Dworakowski</span>
<i>at 2020-11-20T02:09:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clarify interruptible FFI wrt masking state
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/321d1bd8a79ab39c3c9e8697fffb0107c43f83cf">321d1bd8</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-11-20T02:09:51-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix strictness signatures of `prefetchValue*#` primops
Their strictness signatures said the primops are strict in their first
argument, which is wrong: Handing it a thunk will prefetch the pointer
to the thunk, but not evaluate it. Hence not strict.
The regression test `T8256` actually tests for laziness in the first
argument, so GHC apparently never exploited the strictness signature.
See also https://gitlab.haskell.org/ghc/ghc/-/issues/8256#note_310867,
where this came up.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0aec78b6c97cee58ba20bfcb959f1369b80c4e4c">0aec78b6</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-11-20T02:09:51-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Demand: Interleave usage and strictness demands (#18903)
As outlined in #18903, interleaving usage and strictness demands not
only means a more compact demand representation, but also allows us to
express demands that we weren't easily able to express before.
Call demands are *relative* in the sense that a call demand `Cn(cd)`
on `g` says "`g` is called `n` times. *Whenever `g` is called*, the
result is used according to `cd`". Example from #18903:
```hs
h :: Int -> Int
h m =
let g :: Int -> (Int,Int)
g 1 = (m, 0)
g n = (2 * n, 2 `div` n)
{-# NOINLINE g #-}
in case m of
1 -> 0
2 -> snd (g m)
_ -> uncurry (+) (g m)
```
Without the interleaved representation, we would just get `L` for the
strictness demand on `g`. Now we are able to express that whenever
`g` is called, its second component is used strictly in denoting `g`
by `1C1(P(1P(U),SP(U)))`. This would allow Nested CPR to unbox the
division, for example.
Fixes #18903.
While fixing regressions, I also discovered and fixed #18957.
Metric Decrease:
T13253-spj
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3a55b3a2574f913d046f3a6f82db48d7f6df32e3">3a55b3a2</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-11-20T02:09:51-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update user's guide entry on demand analysis and worker/wrapper
The demand signature notation has been undocumented for a long time.
The only source to understand it, apart from reading the `Outputable`
instance, has been an outdated wiki page.
Since the previous commits have reworked the demand lattice, I took
it as an opportunity to also write some documentation about notation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fc963932018ccf5445613ec0932d726b51887769">fc963932</a></strong>
<div>
<span>by Greg Steuck</span>
<i>at 2020-11-20T02:10:31-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Find hadrian location more reliably in cabal-install output
Fix #18944
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f40cf6ca9fb24dbc55f7eae43e2b89aa12bf251">9f40cf6c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-20T02:11:07-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/linker: Align bssSize to page size when mapping symbol extras
We place symbol_extras right after bss. We also need
to ensure that symbol_extras can be mprotect'd independently from the
rest of the image. To ensure this we round up the size of bss to a page
boundary, thus ensuring that symbol_extras is also page-aligned.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b739c319dd56fa2aabd8007cc200eafb3c7651a7">b739c319</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-20T02:11:43-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add usage message to ci.sh
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/802e9180dd9a9a88c4e8869f0de1048e1edd6343">802e9180</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-20T02:11:43-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add VERBOSE environment variable
And change the make build system's default behavior to V=0, greatly
reducing build log sizes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2a8a979c24fe34a81a438ae179693ddaca12709f">2a8a979c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-21T01:13:26-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: A bit of clean-up in profiling flag documentation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/56804e33a05729f5a5340d3680ae2849e30a9e86">56804e33</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-21T01:13:26-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Refactor CountParserDeps
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53ad67eacacde8fde452f1a323d5886183375182">53ad67ea</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-21T01:13:26-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Introduce -fprof-callers flag
This introducing a new compiler flag to provide a convenient way to
introduce profiler cost-centers on all occurrences of the named
identifier.
Closes #18566.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ecfd0278cb811c93853c176fe5df60222d1a8fb5">ecfd0278</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-11-21T01:14:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move Plugins into HscEnv (#17957)
Loaded plugins have nothing to do in DynFlags so this patch moves them
into HscEnv (session state).
"DynFlags plugins" become "Driver plugins" to still be able to register
static plugins.
Bump haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/72f2257c792e6178933f12ee3401939da11584b6">72f2257c</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-11-21T01:14:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't initialize plugins in the Core2Core pipeline
Some plugins can be added via TH (cf addCorePlugin). Initialize them in
the driver instead of in the Core2Core pipeline.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ddbeeb3c7dc7a2781801cc0e6539d2b4b0e97a20">ddbeeb3c</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-11-21T01:14:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #10504
This issue was fixed at some point between GHC 8.0 and 8.2. Let's add a
regression test to ensure that it stays fixed.
Fixes #10504.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a4a6dc2a90e28c34054d0cfd4c6fd962bf4adc2e">a4a6dc2a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-21T01:15:21-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">dwarf: Apply info table offset consistently
Previously we failed to apply the info table offset to the aranges and
DIEs, meaning that we often failed to unwind in gdb. For some reason
this only seemed to manifest in the RTS's Cmm closures. Nevertheless,
now we can unwind completely up to `main`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/69bfbc216c2278c9796aa999c7815c19c12b0f2c">69bfbc21</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-21T01:15:56-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Disable stripping when debug information is enabled
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/207c8d41673f862ffba1426d29f7980814d97024">207c8d41</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-11-21T06:29:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use HsOuterExplicit in instance sigs in deriving-generated code
Issue #18914 revealed that `GeneralizedNewtypeDeriving` would generate code
that mentions unbound type variables, which is dangerously fragile. The
problem (and fix) is described in the new `Wrinkle: Use HsOuterExplicit`
in `Note [GND and QuantifiedConstraints]`. The gist of it: make sure to
put the top-level `forall`s in `deriving`-generated instance signatures in an
`HsOuterExplicit` to ensure that they scope over the bodies of methods
correctly. A side effect of this process is that it will expand any type
synonyms in the instance signature, which will surface any `forall`s that
are hidden underneath type synonyms (such as in the test case for #18914).
While I was in town, I also performed some maintenance on `NewHsTypeX`, which
powers `GeneralizedNewtypeDeriving`:
* I renamed `NewHsTypeX` to `HsCoreTy`, which more accurately describes its
intended purpose (#15706). I also made `HsCoreTy` a type synonym instead of
a newtype, as making it a distinct data type wasn't buying us much.
* To make sure that mistakes similar to #18914 do not occur later, I added an
additional validity check when renaming `HsCoreTy`s that complains if an
`HsCoreTy`s contains an out-of-scope type variable. See the new
`Note [Renaming HsCoreTys]` in `GHC.Rename.HsType` for the details.
Fixes #15706. Fixes #18914. Bumps the `haddock` submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dd250208bc14be4919bd151b98d5ddc59f1fd070">dd250208</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-11-21T06:29:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T14702 as fragile on Windows
See #18953.
</pre>
</li>
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