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<h3>
Ben Gamari pushed to branch wip/T18566
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/fcfda909fd7fcf539ff31717ce01a56292abb92f">fcfda909</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-11T03:19:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nativeGen: Make makeImportsDoc take an NCGConfig rather than DynFlags
It appears this was an oversight as there is no reason the full DynFlags
is necessary.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e23695e7d84aa248e7ca20bdb8d133f9b356548">6e23695e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-11T03:19:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move this_module into NCGConfig
In various places in the NCG we need the Module currently being
compiled. Let's move this into the environment instead of chewing threw
another register.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c6264a2d652517954b7cd076c7bc4487ed17c97d">c6264a2d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-11T03:20:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">codeGen: Produce local symbols for module-internal functions
It turns out that some important native debugging/profiling tools (e.g.
perf) rely only on symbol tables for function name resolution (as
opposed to using DWARF DIEs). However, previously GHC would emit
temporary symbols (e.g. `.La42b`) to identify module-internal
entities. Such symbols are dropped during linking and therefore not
visible to runtime tools (in addition to having rather un-helpful unique
names). For instance, `perf report` would often end up attributing all
cost to the libc `frame_dummy` symbol since Haskell code was no covered
by any proper symbol (see #17605).
We now rather follow the model of C compilers and emit
descriptively-named local symbols for module internal things. Since this
will increase object file size this behavior can be disabled with the
`-fno-expose-internal-symbols` flag.
With this `perf record` can finally be used against Haskell executables.
Even more, with `-g3` `perf annotate` provides inline source code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/584058ddff71460023712a8d816b83b581e6e78f">584058dd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-11T03:20:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable -fexpose-internal-symbols when debug level >=2
This seems like a reasonable default as the object file size increases
by around 5%.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c34a4b98b1f09ea3096d39a839a86f2d7185c796">c34a4b98</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-11-11T03:20:35-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix and enable object unloading in GHCi
Fixes #16525 by tracking dependencies between object file symbols and
marking symbol liveness during garbage collection
See Note [Object unloading] in CheckUnload.c for details.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2782487f5f6ad9df4dc8725226a47f07fec77f9f">2782487f</a></strong>
<div>
<span>by Ray Shih</span>
<i>at 2020-11-11T03:20:35-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add loadNativeObj and unloadNativeObj
(This change is originally written by niteria)
This adds two functions:
* `loadNativeObj`
* `unloadNativeObj`
and implements them for Linux.
They are useful if you want to load a shared object with Haskell code
using the system linker and have GHC call dlclose() after the
code is no longer referenced from the heap.
Using the system linker allows you to load the shared object
above outside the low-mem region. It also loads the DWARF sections
in a way that `perf` understands.
`dl_iterate_phdr` is what makes this implementation Linux specific.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a65f9e140906087273ce95f062775f18f6a708d">7a65f9e1</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-11-11T03:20:35-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Introduce highMemDynamic
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e9e1b2e75de17be47ab887a26943f5517a8463ac">e9e1b2e7</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-11-11T03:20:35-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Introduce test for dynamic library unloading
This uses the highMemDynamic flag introduced earlier to verify that
dynamic objects are properly unloaded.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5506f1342e51bad71a7525ddad0650d1ac63afeb">5506f134</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-11-11T03:21:14-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Force argument in setIdMult (#18925)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/40a4f83aa88a3b2b0d795eabca61f9858ea759fc">40a4f83a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-11T21:37:52-05:00</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/73b71342e1a7c7e3efdc251710b2d0ac26a078e5">73b71342</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-11T21:37:53-05:00</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>
</ul>
<h4>30 changed files:</h4>
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<a href="#db697f6aea9f93f1583f1d5c62d25570a1e07f73">
compiler/GHC/Cmm/CLabel.hs
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<a href="#2d3721ad8de95e1144493ca545db846672cb109f">
compiler/GHC/Cmm/Info/Build.hs
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<a href="#10b61652f9817945bb54ccf8fc40f8a664ca3c30">
compiler/GHC/CmmToAsm.hs
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<li class="file-stats">
<a href="#7223682bb3d11ed5bc80db47627d3d9ef7fa2ac7">
compiler/GHC/CmmToAsm/Config.hs
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<a href="#ea29061dab1b843e0ea9294afc614998f3a8d08f">
compiler/GHC/CmmToAsm/Monad.hs
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<a href="#ce4acbced40df8012ccc56db501549f835fb180b">
compiler/GHC/CmmToAsm/PIC.hs
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<a href="#335d279236d65dcf13f2bab3891e515cb803203c">
compiler/GHC/CmmToAsm/X86/Ppr.hs
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<a href="#36a42448a83a9d1f6df8475f03ead2eed199dd8e">
compiler/GHC/Core/Lint.hs
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<a href="#ced9f8f23dd8f14e014e34508a2d61001cd0494c">
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compiler/GHC/Core/Opt/CallerCC.hs
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<a href="#2f5ddf897685c155e88a107be20a890f40a0fbf1">
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compiler/GHC/Core/Opt/CallerCC.hs-boot
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<a href="#9aae8d40d1a22cf73eaec14fd86dfc6917ce10e5">
compiler/GHC/Core/Opt/Monad.hs
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<a href="#bd153f89bc48f3fd5079b51fb799808aacbd750c">
compiler/GHC/Core/Opt/Pipeline.hs
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<a href="#2e5692f568fd7b67a6b172e2a60469da8392508c">
compiler/GHC/Driver/Flags.hs
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<a href="#774d88050336ef660c7a219fb06c480c2fc639bc">
compiler/GHC/Driver/Session.hs
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<a href="#0b4bc77723e1f22f50d70e89a81f6d92c3904408">
compiler/GHC/Iface/Recomp/Flags.hs
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<a href="#5aa3321b0f5c08d7ebfa1a4a3340d4451258988b">
compiler/GHC/Linker/Loader.hs
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<a href="#5dac619989e8509003cf7b463c100f5cc56072a3">
compiler/GHC/Types/Var.hs
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<a href="#0f33fd88c617246c7f89c4477d2d1d24f942df23">
compiler/ghc.cabal.in
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<a href="#d87dfc77856eeaef6134e28336290ddcbcf18d7d">
docs/users_guide/9.2.1-notes.rst
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<a href="#86c92886ea01ecd58dd8ae627a0e7918ccda57bf">
docs/users_guide/debug-info.rst
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<a href="#12f1226bde7e9f48203d34d8d857513f2f1f4d75">
docs/users_guide/phases.rst
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<a href="#9114465b0120ae8f2588fc60cb49ff264de54ecb">
docs/users_guide/profiling.rst
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<a href="#ae6b27fda1cc1591738c66625518d3472c48163f">
includes/rts/Linker.h
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<a href="#94ca41c5afbb3d932bd6f37ee16458322988fb69">
includes/rts/storage/GC.h
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<a href="#ba1d62598dfbf5ddb817dd9c93461a02a0bba43d">
rts/CheckUnload.c
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<a href="#67cc28da78ad5c427434fbe2efdcecffe61ae002">
rts/CheckUnload.h
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<a href="#152b85a9ce66dcf385a199eab2acad9d98fd737b">
rts/Hash.c
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<a href="#4352fec095ae082617e59e2f077ec6dc9e865ee7">
rts/Hash.h
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<a href="#044fe9284335a9bfd17546e06c2e5c40a680dd3d">
rts/Linker.c
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<a href="#687f0b17315e54a1692de64626391e572ca298e9">
rts/LinkerInternals.h
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<h5>The diff was not included because it is too large.</h5>
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