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<div class="content">
<h3 style="margin-top: 20px; margin-bottom: 10px;">
Hannes Siebenhandl pushed to branch wip/fendor/ifacetype-delay-serialisation 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: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/03084bcc97666b45c94b4aedc8bbddb136152390">03084bcc</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2024-04-15T11:52:42+02:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "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 deduplication table for `IfaceType`
The type `IfaceType` is a highly redundant, tree-like data structure.
While benchmarking, we realised that the high redundancy of `IfaceType`
causes high memory consumption in GHCi sessions.
We fix this by adding a deduplication table to the serialisation of
`ModIface`, similar to how we deduplicate `Name`s and `FastString`s.
When reading the interface file back, the table allows us to automatically
share identical values of `IfaceType`.
This deduplication has the beneficial side effect to additionally reduce
the size of the on-disk interface files tremendously. On the agda code
base, we reduce the size from 28 MB to 16 MB. When `-fwrite-simplified-core`
is enabled, we reduce the size from 112 MB to 22 MB.
We have to add an `Ord` instance to `IfaceType` in order to store it
efficiently for look up operations. This is mostly straightforward, we
change occurrences of `FastString` with `LexicalFastString` and add a
newtype definition for `IfLclName = LexicalFastString`.
We also add IfaceType deduplication table to .hie serialisation and
refactor .hie file serialisation to use the same infrastrucutre as
`putWithTables`.
Bump haddock submodule for `IfLclName` newtype changes.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d64cfe21eebb64db08da04d5d2bd613cc737f5e8">d64cfe21</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2024-04-15T11:54:14+02:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "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 some tests to check for size of interface files when serialising
various types
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5610aa869959f8d7980329dddc8ba3fd5698191c">5610aa86</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2024-04-15T11:54:14+02:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "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;'>WIP: TrieMap for IfaceType
Bump haddock submodule
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2a19c5c55a5dceea9dbcef696c2b638ad788a716">2a19c5c5</a></strong>
<div>
<span> by Fendor </span> <i> at 2024-04-15T11:54:15+02:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "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;'>WIP: CI results for Data.Map deduplication
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/292f6f81ee65f0972b9bc1687b0e2fcd68e39025">292f6f81</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2024-04-15T11:54:15+02:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "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;'>Only share IfaceTyConApp
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c5077818d5893f5ab5e58bd06306faa59b54c1c5">c5077818</a></strong>
<div>
<span> by Fendor </span> <i> at 2024-04-15T11:56:54+02:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "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;'>Share duplicated values in ModIface after generation
This helps keeping down the peak memory usage while compiling in
`--make` mode.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/003ac7de815b26575fa03d82ae682007348c8749">003ac7de</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2024-04-15T12:01:15+02:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "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;'>Delay deserialisation of `IfaceType` until needed
Introduces `IfaceSerialisationType` which holds onto a ByteString
in-memory. All `IfaceType`'s are first deserialised to
`IfaceSerialisationType`, so no actual deserialisation happens until the
value is requested. Then, we decode `IfaceSerialisationType` into the
real `IfaceType` value.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/939a1c746f49bab04821ae7615bccb8005020519">939a1c74</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2024-04-15T12:01:17+02:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "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;'>MP fixes
</pre>
</li>
</ul>
<h4 style="margin-top: 10px; margin-bottom: 10px;">
30 changed files:
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<a href="#640612f2fdc707ac7ee74f4165a7b86f38aa6249">
compiler/GHC/Core/Map/Expr.hs
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<a href="#578c7c3857d66d963736ff6742f3433a0e8d01b7">
compiler/GHC/Core/TyCo/Rep.hs
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<a href="#bbf06eb5d4f0db7bc3213b84b9f5822710ff7be8">
compiler/GHC/CoreToIface.hs
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compiler/GHC/Data/FastString.hs
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compiler/GHC/Data/TrieMap.hs
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compiler/GHC/Driver/Main.hs
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compiler/GHC/Iface/Binary.hs
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compiler/GHC/Iface/Decl.hs
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compiler/GHC/Iface/Env.hs
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compiler/GHC/Iface/Ext/Binary.hs
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compiler/GHC/Iface/Ext/Utils.hs
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compiler/GHC/Iface/Make.hs
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compiler/GHC/Iface/Recomp.hs
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compiler/GHC/Iface/Recomp/Binary.hs
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compiler/GHC/Iface/Syntax.hs
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compiler/GHC/Iface/Type.hs
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compiler/GHC/Iface/Type/Map.hs
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compiler/GHC/IfaceToCore.hs
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compiler/GHC/Stg/CSE.hs
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compiler/GHC/StgToJS/Object.hs
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compiler/GHC/Tc/Types.hs
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compiler/GHC/Types/Basic.hs
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compiler/GHC/Types/Var.hs
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compiler/GHC/Unit/Module/ModIface.hs
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compiler/GHC/Utils/Binary.hs
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compiler/Language/Haskell/Syntax/Type.hs
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compiler/Language/Haskell/Syntax/Type.hs-boot
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compiler/ghc.cabal.in
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testsuite/tests/iface/IfaceSharingFastString.hs
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