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<h3>
Marge Bot pushed to branch master
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/49301ad6226d9a83d110bee8c419615dd94f5ded">49301ad6</a></strong>
<div>
<span>by Andrew Martin</span>
<i>at 2020-05-23T13:37:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement cstringLength# and FinalPtr
This function and its accompanying rule resolve issue #5218.
A future PR to the bytestring library will make the internal
Data.ByteString.Internal.unsafePackAddress compute string length
with cstringLength#. This will improve the status quo because it is
eligible for constant folding.
Additionally, introduce a new data constructor to ForeignPtrContents
named FinalPtr. This additional data constructor, when used in the
IsString instance for ByteString, leads to more Core-to-Core
optimization opportunities, fewer runtime allocations, and smaller
binaries.
Also, this commit re-exports all the functions from GHC.CString
(including cstringLength#) in GHC.Exts. It also adds a new test
driver. This test driver is used to perform substring matches on Core
that is dumped after all the simplifier passes. In this commit, it is
used to check that constant folding of cstringLength# works.
</pre>
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<h4>19 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#0887cf39c5cdf9cf8d6758f410d7dab3023c0d77">
compiler/GHC/Builtin/Names.hs
</a>
</li>
<li class="file-stats">
<a href="#aa79261abf782f3dc603af7fbd5c4b08ed3ddb88">
compiler/GHC/Core/Opt/ConstantFold.hs
</a>
</li>
<li class="file-stats">
<a href="#d51029aec6ce58e66d4b48865c1dd0d2038fda29">
compiler/GHC/Data/FastString.hs
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<li class="file-stats">
<a href="#6fd95917308bec0dc8f4ae2a0b62cb5fe33f38c4">
compiler/GHC/Hs/Lit.hs
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<li class="file-stats">
<a href="#2eac51f9871ca0c0698aa1fc7f79c05ef8fc4a49">
compiler/GHC/ThToHs.hs
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<li class="file-stats">
<a href="#ee98f016857ad5548bb7cdc5dd85246585acdfd6">
compiler/GHC/Types/Literal.hs
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<li class="file-stats">
<a href="#b421960e854c6cfa1e4ca830bd6a5fc6eef91168">
docs/users_guide/8.12.1-notes.rst
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<li class="file-stats">
<a href="#48a6c03232a2b3f836daeff09b3c6e3790804632">
libraries/base/GHC/Exts.hs
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<li class="file-stats">
<a href="#269448746b2d7046ede74979e927b8642db7271f">
libraries/base/GHC/ForeignPtr.hs
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<li class="file-stats">
<a href="#5550456b4c18a3437d117712bc1421c71cca5d98">
libraries/ghc-prim/GHC/CString.hs
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<li class="file-stats">
<a href="#54f2593fa6d429b2b82cc2200e8bcda0f38854de">
libraries/ghc-prim/changelog.md
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<li class="file-stats">
<a href="#daeb140bfe6f19db486a97bdd268061b7bb41ba0">
testsuite/.gitignore
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<li class="file-stats">
<a href="#c591f85f122007bac88228c5ff6fd76b40e6a811">
testsuite/driver/testlib.py
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<li class="file-stats">
<a href="#b115a1163b6ea8fe266ae5e6cbd11f751fb589c1">
<span class="new-file">
+
testsuite/tests/primops/should_gen_core/CStringLength_core.hs
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<li class="file-stats">
<a href="#645bd59dbbb050e4a4a8d9f54654a9b98b748a85">
<span class="new-file">
+
testsuite/tests/primops/should_gen_core/CStringLength_core.substr-simpl
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<li class="file-stats">
<a href="#73f13538e53a9aee1c6bfce449e6080440f27c51">
<span class="new-file">
+
testsuite/tests/primops/should_gen_core/all.T
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</li>
<li class="file-stats">
<a href="#14271bae21dd61cfeac56241725313f6c1b14a12">
<span class="new-file">
+
testsuite/tests/primops/should_run/CStringLength.hs
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<li class="file-stats">
<a href="#dc4ef5e91ca9282abb93ef37f3bd2222ba86be88">
<span class="new-file">
+
testsuite/tests/primops/should_run/CStringLength.stdout
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<li class="file-stats">
<a href="#98e52aadad6ed0677c8e810ba5f46030fd516bdd">
testsuite/tests/primops/should_run/all.T
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<h4>Changes:</h4>
<li id="0887cf39c5cdf9cf8d6758f410d7dab3023c0d77">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded#0887cf39c5cdf9cf8d6758f410d7dab3023c0d77"><strong>compiler/GHC/Builtin/Names.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="349" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="349" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -349,6 +349,7 @@ basicKnownKeyNames</td>
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349
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349
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<pre style="margin: 0;"> <span id="LC349" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Strings and lists</span></span>
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350
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350
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<pre style="margin: 0;"> <span id="LC350" class="line" lang="haskell"> <span class="n" style="color: #333;">unpackCStringName</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="351" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
351
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<td class="diff-line-num new_line" data-linenumber="351" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
351
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<pre style="margin: 0;"> <span id="LC351" class="line" lang="haskell"> <span class="n" style="color: #333;">unpackCStringFoldrName</span><span class="p">,</span> <span class="n" style="color: #333;">unpackCStringUtf8Name</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="352" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="352" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
352
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<pre style="margin: 0;">+<span id="LC352" class="line" lang="haskell"> <span class="n" style="color: #333;">cstringLengthName</span><span class="p">,</span></span>
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352
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<td class="diff-line-num new_line" data-linenumber="353" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
353
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<pre style="margin: 0;"> <span id="LC353" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="353" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
353
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<td class="diff-line-num new_line" data-linenumber="354" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
354
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<pre style="margin: 0;"> <span id="LC354" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Overloaded lists</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="354" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
354
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<td class="diff-line-num new_line" data-linenumber="355" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
355
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<pre style="margin: 0;"> <span id="LC355" class="line" lang="haskell"> <span class="n" style="color: #333;">isListClassName</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1014" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1015" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1014,10 +1015,11 @@ modIntName = varQual gHC_CLASSES (fsLit "modInt#") modIntIdKey</td>
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1014
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1015
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<pre style="margin: 0;"> <span id="LC1015" class="line" lang="haskell"></span>
</pre>
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1015
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<td class="diff-line-num new_line" data-linenumber="1016" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1016
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<pre style="margin: 0;"> <span id="LC1016" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Base strings Strings</span></span>
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1016
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<td class="diff-line-num new_line" data-linenumber="1017" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1017
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<pre style="margin: 0;"> <span id="LC1017" class="line" lang="haskell"><span class="n" style="color: #333;">unpackCStringName</span><span class="p">,</span> <span class="n" style="color: #333;">unpackCStringFoldrName</span><span class="p">,</span></span>
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1017
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<pre style="margin: 0;">-<span id="LC1017" class="line" lang="haskell"> <span class="n" style="color: #333;">unpackCStringUtf8Name</span><span class="p">,</span> <span class="n" style="color: #333;">eqStringName</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1018" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1018" class="line" lang="haskell"> <span class="n" style="color: #333;">unpackCStringUtf8Name</span><span class="p">,</span> <span class="n" style="color: #333;">eqStringName</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">cstringLengthName</span></span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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1018
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<pre style="margin: 0;"> <span id="LC1019" class="line" lang="haskell"><span class="n" style="color: #333;">unpackCStringName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varQual</span> <span class="n" style="color: #333;">gHC_CSTRING</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"unpackCString#"</span><span class="p">)</span> <span class="n" style="color: #333;">unpackCStringIdKey</span></span>
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1019
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<td class="diff-line-num new_line" data-linenumber="1020" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"><span class="n" style="color: #333;">unpackCStringFoldrName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varQual</span> <span class="n" style="color: #333;">gHC_CSTRING</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"unpackFoldrCString#"</span><span class="p">)</span> <span class="n" style="color: #333;">unpackCStringFoldrIdKey</span></span>
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1020
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"><span class="n" style="color: #333;">unpackCStringUtf8Name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varQual</span> <span class="n" style="color: #333;">gHC_CSTRING</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"unpackCStringUtf8#"</span><span class="p">)</span> <span class="n" style="color: #333;">unpackCStringUtf8IdKey</span></span>
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<pre style="margin: 0;">+<span id="LC1022" class="line" lang="haskell"><span class="n" style="color: #333;">cstringLengthName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varQual</span> <span class="n" style="color: #333;">gHC_CSTRING</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"cstringLength#"</span><span class="p">)</span> <span class="n" style="color: #333;">cstringLengthIdKey</span></span>
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1023
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<pre style="margin: 0;"> <span id="LC1023" class="line" lang="haskell"><span class="n" style="color: #333;">eqStringName</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varQual</span> <span class="n" style="color: #333;">gHC_BASE</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"eqString"</span><span class="p">)</span> <span class="n" style="color: #333;">eqStringIdKey</span></span>
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1024
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<pre style="margin: 0;"> <span id="LC1024" class="line" lang="haskell"></span>
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1025
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The 'inline' function</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2097,7 +2099,7 @@ wildCardKey, absentErrorIdKey, augmentIdKey, appendIdKey,</td>
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2097
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2099
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<pre style="margin: 0;"> <span id="LC2099" class="line" lang="haskell"> <span class="n" style="color: #333;">unpackCStringUtf8IdKey</span><span class="p">,</span> <span class="n" style="color: #333;">unpackCStringAppendIdKey</span><span class="p">,</span></span>
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2100
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<pre style="margin: 0;"> <span id="LC2100" class="line" lang="haskell"> <span class="n" style="color: #333;">unpackCStringFoldrIdKey</span><span class="p">,</span> <span class="n" style="color: #333;">unpackCStringIdKey</span><span class="p">,</span></span>
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2101
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<pre style="margin: 0;"> <span id="LC2101" class="line" lang="haskell"> <span class="n" style="color: #333;">typeErrorIdKey</span><span class="p">,</span> <span class="n" style="color: #333;">divIntIdKey</span><span class="p">,</span> <span class="n" style="color: #333;">modIntIdKey</span><span class="p">,</span></span>
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2100
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<pre style="margin: 0;">-<span id="LC2100" class="line" lang="haskell"> <span class="n" style="color: #333;">absentSumFieldErrorIdKey</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Unique</span></span>
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2102
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<pre style="margin: 0;">+<span id="LC2102" class="line" lang="haskell"> <span class="n" style="color: #333;">absentSumFieldErrorIdKey</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">cstringLengthIdKey</span></span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Unique</span></span>
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2103
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<pre style="margin: 0;"> <span id="LC2103" class="line" lang="haskell"></span>
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2102
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2104
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<pre style="margin: 0;"> <span id="LC2104" class="line" lang="haskell"><span class="n" style="color: #333;">wildCardKey</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPreludeMiscIdUnique</span> <span class="mi" style="color: #099;">0</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [WildCard binders]</span></span>
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2105
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<pre style="margin: 0;"> <span id="LC2105" class="line" lang="haskell"><span class="n" style="color: #333;">absentErrorIdKey</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPreludeMiscIdUnique</span> <span class="mi" style="color: #099;">1</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2124,6 +2126,7 @@ voidPrimIdKey = mkPreludeMiscIdUnique 21</td>
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2124
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2126
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<pre style="margin: 0;"> <span id="LC2126" class="line" lang="haskell"><span class="n" style="color: #333;">typeErrorIdKey</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPreludeMiscIdUnique</span> <span class="mi" style="color: #099;">22</span></span>
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2125
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2127
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<pre style="margin: 0;"> <span id="LC2127" class="line" lang="haskell"><span class="n" style="color: #333;">divIntIdKey</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPreludeMiscIdUnique</span> <span class="mi" style="color: #099;">23</span></span>
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2126
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2128
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<pre style="margin: 0;"> <span id="LC2128" class="line" lang="haskell"><span class="n" style="color: #333;">modIntIdKey</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPreludeMiscIdUnique</span> <span class="mi" style="color: #099;">24</span></span>
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<pre style="margin: 0;">+<span id="LC2129" class="line" lang="haskell"><span class="n" style="color: #333;">cstringLengthIdKey</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPreludeMiscIdUnique</span> <span class="mi" style="color: #099;">25</span></span>
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2127
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2130
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<pre style="margin: 0;"> <span id="LC2130" class="line" lang="haskell"></span>
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2128
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2131
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<pre style="margin: 0;"> <span id="LC2131" class="line" lang="haskell"><span class="n" style="color: #333;">concatIdKey</span><span class="p">,</span> <span class="n" style="color: #333;">filterIdKey</span><span class="p">,</span> <span class="n" style="color: #333;">zipIdKey</span><span class="p">,</span></span>
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2129
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2132
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<pre style="margin: 0;"> <span id="LC2132" class="line" lang="haskell"> <span class="n" style="color: #333;">bindIOIdKey</span><span class="p">,</span> <span class="n" style="color: #333;">returnIOIdKey</span><span class="p">,</span> <span class="n" style="color: #333;">newStablePtrIdKey</span><span class="p">,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -66,6 +66,7 @@ import qualified Data.ByteString as BS</td>
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66
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Int</span></span>
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67
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Ratio</span></span>
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68
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68
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Word</span></span>
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69
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Maybe</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">fromMaybe</span><span class="p">)</span></span>
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69
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70
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"></span>
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70
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71
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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72
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Constant folding]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1257,6 +1258,8 @@ builtinRules</td>
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1257
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1258
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<pre style="margin: 0;"> <span id="LC1258" class="line" lang="haskell"> <span class="n" style="color: #333;">ru_nargs</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">4</span><span class="p">,</span> <span class="n" style="color: #333;">ru_try</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">match_append_lit</span> <span class="p">},</span></span>
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1258
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1259
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<pre style="margin: 0;"> <span id="LC1259" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BuiltinRule</span> <span class="p">{</span> <span class="n" style="color: #333;">ru_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"EqString"</span><span class="p">,</span> <span class="n" style="color: #333;">ru_fn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqStringName</span><span class="p">,</span></span>
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1259
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1260
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<pre style="margin: 0;"> <span id="LC1260" class="line" lang="haskell"> <span class="n" style="color: #333;">ru_nargs</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">2</span><span class="p">,</span> <span class="n" style="color: #333;">ru_try</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">match_eq_string</span> <span class="p">},</span></span>
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1261
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<pre style="margin: 0;">+<span id="LC1261" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BuiltinRule</span> <span class="p">{</span> <span class="n" style="color: #333;">ru_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"CStringLength"</span><span class="p">,</span> <span class="n" style="color: #333;">ru_fn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cstringLengthName</span><span class="p">,</span></span>
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1262
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<pre style="margin: 0;">+<span id="LC1262" class="line" lang="haskell"> <span class="n" style="color: #333;">ru_nargs</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span><span class="p">,</span> <span class="n" style="color: #333;">ru_try</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">match_cstring_length</span> <span class="p">},</span></span>
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1260
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1263
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<pre style="margin: 0;"> <span id="LC1263" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BuiltinRule</span> <span class="p">{</span> <span class="n" style="color: #333;">ru_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"Inline"</span><span class="p">,</span> <span class="n" style="color: #333;">ru_fn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inlineIdName</span><span class="p">,</span></span>
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1261
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1264
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<pre style="margin: 0;"> <span id="LC1264" class="line" lang="haskell"> <span class="n" style="color: #333;">ru_nargs</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">2</span><span class="p">,</span> <span class="n" style="color: #333;">ru_try</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">match_inline</span> <span class="p">},</span></span>
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1262
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1265
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<pre style="margin: 0;"> <span id="LC1265" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BuiltinRule</span> <span class="p">{</span> <span class="n" style="color: #333;">ru_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"MagicDict"</span><span class="p">,</span> <span class="n" style="color: #333;">ru_fn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">magicDictId</span><span class="p">,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1477,6 +1480,30 @@ match_eq_string _ id_unf _</td>
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1477
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1480
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<pre style="margin: 0;"> <span id="LC1480" class="line" lang="haskell"></span>
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1478
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1481
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<pre style="margin: 0;"> <span id="LC1481" class="line" lang="haskell"><span class="n" style="color: #333;">match_eq_string</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1479
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1482
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<pre style="margin: 0;"> <span id="LC1482" class="line" lang="haskell"></span>
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1483
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<pre style="margin: 0;">+<span id="LC1483" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------------------------------------------</span></span>
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1484
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<pre style="margin: 0;">+<span id="LC1484" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Illustration of this rule:</span></span>
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1485
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<pre style="margin: 0;">+<span id="LC1485" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1486
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<pre style="margin: 0;">+<span id="LC1486" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- cstringLength# "foobar"# --> 6</span></span>
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1487
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<pre style="margin: 0;">+<span id="LC1487" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- cstringLength# "fizz\NULzz"# --> 4</span></span>
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1488
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<pre style="margin: 0;">+<span id="LC1488" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1489" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1489
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<pre style="margin: 0;">+<span id="LC1489" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Nota bene: Addr# literals are suffixed by a NUL byte when they are</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1490" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1490
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<pre style="margin: 0;">+<span id="LC1490" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- compiled to read-only data sections. That's why cstringLength# is</span></span>
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1491
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<pre style="margin: 0;">+<span id="LC1491" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- well defined on Addr# literals that do not explicitly have an embedded</span></span>
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1492
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<pre style="margin: 0;">+<span id="LC1492" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NUL byte.</span></span>
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1493
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<pre style="margin: 0;">+<span id="LC1493" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1494
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<pre style="margin: 0;">+<span id="LC1494" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See GHC issue #5218, MR 2165, and bytestring PR 191. This is particularly</span></span>
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1495
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<pre style="margin: 0;">+<span id="LC1495" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- helpful when using OverloadedStrings to create a ByteString since the</span></span>
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1496
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<pre style="margin: 0;">+<span id="LC1496" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- function computing the length of such ByteStrings can often be constant</span></span>
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1497
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<pre style="margin: 0;">+<span id="LC1497" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- folded.</span></span>
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1498
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<pre style="margin: 0;">+<span id="LC1498" class="line" lang="haskell"><span class="n" style="color: #333;">match_cstring_length</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RuleFun</span></span>
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1499
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<pre style="margin: 0;">+<span id="LC1499" class="line" lang="haskell"><span class="n" style="color: #333;">match_cstring_length</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">id_unf</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">[</span><span class="n" style="color: #333;">lit1</span><span class="p">]</span></span>
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1500
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<pre style="margin: 0;">+<span id="LC1500" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LitString</span> <span class="n" style="color: #333;">str</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">exprIsLiteral_maybe</span> <span class="n" style="color: #333;">id_unf</span> <span class="n" style="color: #333;">lit1</span></span>
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1501
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<pre style="margin: 0;">+<span id="LC1501" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If elemIndex returns Just, it has the index of the first embedded NUL</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1502" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1502
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<pre style="margin: 0;">+<span id="LC1502" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in the string. If no NUL bytes are present (the common case) then use</span></span>
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1503
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<pre style="margin: 0;">+<span id="LC1503" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- full length of the byte string.</span></span>
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1504
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<pre style="margin: 0;">+<span id="LC1504" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">len</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromMaybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BS</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">str</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BS</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">elemIndex</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">str</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1505" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lit</span> <span class="p">(</span><span class="n" style="color: #333;">mkLitInt</span> <span class="p">(</span><span class="n" style="color: #333;">roPlatform</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">fromIntegral</span> <span class="n" style="color: #333;">len</span><span class="p">)))</span></span>
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1506
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<pre style="margin: 0;">+<span id="LC1506" class="line" lang="haskell"><span class="n" style="color: #333;">match_cstring_length</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1507
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<pre style="margin: 0;"> <span id="LC1507" class="line" lang="haskell"></span>
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1481
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1508
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<pre style="margin: 0;"> <span id="LC1508" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">---------------------------------------------------</span></span>
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1482
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1509
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<pre style="margin: 0;"> <span id="LC1509" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The rule is this:</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded#d51029aec6ce58e66d4b48865c1dd0d2038fda29"><strong>compiler/GHC/Data/FastString.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -128,8 +128,9 @@ import Foreign</td>
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<pre style="margin: 0;"> <span id="LC128" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Conc.Sync</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">sharedCAF</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">endif</span></span>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC131" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Base</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">unpackCString</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">unpackNBytes</span><span class="o" style="font-weight: 600;">#</span> <span class="p">)</span></span>
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132
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<pre style="margin: 0;">-<span id="LC132" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">__GLASGOW_HASKELL__</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #099;">811</span></span>
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Base</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">unpackCString</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span><span class="nf" style="color: #900; font-weight: 600;">unpackNBytes</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">endif</span></span>
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"><span class="cd">-- | Gives the UTF-8 encoded bytes corresponding to a 'FastString'</span></span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"><span class="n" style="color: #333;">bytesFS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FastString</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ByteString</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded#6fd95917308bec0dc8f4ae2a0b62cb5fe33f38c4"><strong>compiler/GHC/Hs/Lit.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -53,7 +53,7 @@ data HsLit x</td>
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53
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Unboxed character</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsString</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsString</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="cm" style="color: #998; font-style: italic;">{- SourceText -}</span> <span class="kt" style="color: #458; font-weight: 600;">FastString</span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ String</span></span>
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<pre style="margin: 0;">-<span id="LC56" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsStringPrim</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsStringPrim</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="cm" style="color: #998; font-style: italic;">{- SourceText -}</span> <span class="kt" style="color: #458; font-weight: 600;">ByteString</span></span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsStringPrim</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsStringPrim</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="cm" style="color: #998; font-style: italic;">{- SourceText -}</span> <span class="o" style="font-weight: 600;"><span class="idiff left right">!</span></span><span class="kt" style="color: #458; font-weight: 600;">ByteString</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Packed bytes</span></span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsInt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsInt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">IntegralLit</span></span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Genuinely an Int; arises from</span></span>
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<li id="2eac51f9871ca0c0698aa1fc7f79c05ef8fc4a49">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded#2eac51f9871ca0c0698aa1fc7f79c05ef8fc4a49"><strong>compiler/GHC/ThToHs.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -6,6 +6,7 @@</td>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This module converts Template Haskell syntax into Hs syntax</span></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE BangPatterns #-}</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DeriveFunctor #-}</span></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE FlexibleContexts #-}</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ScopedTypeVariables #-}</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1232,8 +1233,7 @@ cvtLit (CharPrimL c) = do { force c; return $ HsCharPrim NoSourceText c }</td>
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<pre style="margin: 0;"> <span id="LC1233" class="line" lang="haskell"><span class="n" style="color: #333;">cvtLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StringL</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">{</span> <span class="n" style="color: #333;">s'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkFastString</span> <span class="n" style="color: #333;">s</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1234" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">force</span> <span class="n" style="color: #333;">s'</span></span>
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<pre style="margin: 0;"> <span id="LC1235" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsString</span> <span class="p">(</span><span class="n" style="color: #333;">quotedSourceText</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="n" style="color: #333;">s'</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC1235" class="line" lang="haskell"><span class="n" style="color: #333;">cvtLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StringPrimL</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">{</span> <span class="n" style="color: #333;">s'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">BS</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">pack</span> <span class="n" style="color: #333;">s</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC1236" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">force</span> <span class="n" style="color: #333;">s'</span></span>
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<pre style="margin: 0;">+<span id="LC1236" class="line" lang="haskell"><span class="n" style="color: #333;">cvtLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StringPrimL</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">{</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">s'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">BS</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">pack</span> <span class="n" style="color: #333;">s</span> <span class="p">}</span></span>
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1237
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<pre style="margin: 0;"> <span id="LC1237" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsStringPrim</span> <span class="kt" style="color: #458; font-weight: 600;">NoSourceText</span> <span class="n" style="color: #333;">s'</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1238" class="line" lang="haskell"><span class="n" style="color: #333;">cvtLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BytesPrimL</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bytes</span> <span class="n" style="color: #333;">fptr</span> <span class="n" style="color: #333;">off</span> <span class="n" style="color: #333;">sz</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC1239" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">bs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unsafePerformIO</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withForeignPtr</span> <span class="n" style="color: #333;">fptr</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">ptr</span> <span class="o" style="font-weight: 600;">-></span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded#ee98f016857ad5548bb7cdc5dd85246585acdfd6"><strong>compiler/GHC/Types/Literal.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -114,7 +114,7 @@ data Literal</td>
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<pre style="margin: 0;"> <span id="LC114" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Types of LitNumbers] below for the</span></span>
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Type field.</span></span>
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC117" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">LitString</span> <span class="idiff left right"> </span><span class="kt" style="color: #458; font-weight: 600;">ByteString</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ A string-literal: stored and emitted</span></span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">LitString</span> <span class="o" style="font-weight: 600;"><span class="idiff left right">!</span></span><span class="kt" style="color: #458; font-weight: 600;">ByteString</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ A string-literal: stored and emitted</span></span>
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- UTF-8 encoded, we'll arrange to decode it</span></span>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- at runtime. Also emitted with a @\'\\0\'@</span></span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- terminator. Create with 'mkLitString'</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded#b421960e854c6cfa1e4ca830bd6a5fc6eef91168"><strong>docs/users_guide/8.12.1-notes.rst</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -144,6 +144,9 @@ Arrow notation</td>
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="plaintext">``ghc-prim`` library</span>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="plaintext">~~~~~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="plaintext">- Add a known-key ``cstringLength#`` to ``GHC.CString`` that is eligible</span>
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="plaintext"> for constant folding by a built-in rule.</span>
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="plaintext">``ghc`` library</span>
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="plaintext">~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="plaintext"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -181,6 +184,15 @@ Arrow notation</td>
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<pre style="margin: 0;"> <span id="LC184" class="line" lang="plaintext">``base`` library</span>
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="plaintext">~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="plaintext"></span>
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187
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<pre style="margin: 0;">+<span id="LC187" class="line" lang="plaintext">- ``ForeignPtrContents`` has a new nullary data constructor ``FinalPtr``.</span>
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188
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<pre style="margin: 0;">+<span id="LC188" class="line" lang="plaintext"> ``FinalPtr`` is intended for turning a primitive string literal into a</span>
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189
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<pre style="margin: 0;">+<span id="LC189" class="line" lang="plaintext"> ``ForeignPtr``. Unlike ``PlainForeignPtr``, ``FinalPtr`` does not have</span>
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190
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<pre style="margin: 0;">+<span id="LC190" class="line" lang="plaintext"> a finalizer. Replacing ``PlainForeignPtr`` that has ``NoFinalizers`` with</span>
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191
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<pre style="margin: 0;">+<span id="LC191" class="line" lang="plaintext"> ``FinalPtr`` reduces allocations, reduces the size of compiled binaries,</span>
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192
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<pre style="margin: 0;">+<span id="LC192" class="line" lang="plaintext"> and unlocks important Core-to-Core optimizations. ``FinalPtr`` will be used</span>
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<pre style="margin: 0;">+<span id="LC193" class="line" lang="plaintext"> in an upcoming ``bytestring`` release to improve the performance of</span>
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194
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<pre style="margin: 0;">+<span id="LC194" class="line" lang="plaintext"> ``ByteString`` literals created with ``OverloadedStrings``.</span>
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195
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<pre style="margin: 0;">+<span id="LC195" class="line" lang="plaintext"></span>
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184
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196
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<pre style="margin: 0;"> <span id="LC196" class="line" lang="plaintext">Build system</span>
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<pre style="margin: 0;"> <span id="LC197" class="line" lang="plaintext">~~~~~~~~~~~~</span>
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186
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="plaintext"></span>
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<li id="48a6c03232a2b3f836daeff09b3c6e3790804632">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded#48a6c03232a2b3f836daeff09b3c6e3790804632"><strong>libraries/base/GHC/Exts.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -54,6 +54,14 @@ module GHC.Exts</td>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Overloaded string literals</span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IsString</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * CString</span></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">unpackCString</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span></span>
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59
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">unpackAppendCString</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">unpackFoldrCString</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span></span>
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61
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">unpackCStringUtf8</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span></span>
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62
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">unpackNBytes</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">cstringLength</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Debugging</span></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">breakpoint</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">breakpointCond</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"></span>
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<li id="269448746b2d7046ede74979e927b8642db7271f">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded#269448746b2d7046ede74979e927b8642db7271f"><strong>libraries/base/GHC/ForeignPtr.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -23,11 +23,13 @@</td>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.ForeignPtr</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"> <span class="p">(</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Types</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ForeignPtr</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ForeignPtrContents</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Finalizers</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">FinalizerPtr</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">FinalizerEnvPtr</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Create</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">newForeignPtr_</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mallocForeignPtr</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mallocPlainForeignPtr</span><span class="p">,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -35,15 +37,20 @@ module GHC.ForeignPtr</td>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mallocPlainForeignPtrBytes</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mallocForeignPtrAlignedBytes</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mallocPlainForeignPtrAlignedBytes</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">newConcForeignPtr</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Add Finalizers</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">addForeignPtrFinalizer</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">addForeignPtrFinalizerEnv</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC40" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">touchForeignPtr</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">addForeignPtrConcFinalizer</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Conversion</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">unsafeForeignPtrToPtr</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">castForeignPtr</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">plusForeignPtr</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC44" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">newConcForeignPtr</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;">-<span id="LC45" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">addForeignPtrConcFinalize</span>r</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- * Finalization</span></span></span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">touchForeignPt</span>r</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">finalizeForeignPtr</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Commentary</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- $commentary</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Foreign.Storable</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -86,15 +93,121 @@ data ForeignPtr a = ForeignPtr Addr# ForeignPtrContents</td>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- object, because that ensures that whatever the finalizer is</span></span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- attached to is kept alive.</span></span>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"><span class="cd">-- | Functions called when a 'ForeignPtr' is finalized. Note that</span></span>
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- C finalizers and Haskell finalizers cannot be mixed.</span></span>
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Finalizers</span></span>
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoFinalizers</span></span>
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ No finalizer. If there is no intent to add a finalizer at</span></span>
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- any point in the future, consider 'FinalPtr' or 'PlainPtr' instead</span></span>
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- since these perform fewer allocations.</span></span>
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CFinalizers</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Weak</span><span class="o" style="font-weight: 600;">#</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Finalizers are all C functions.</span></span>
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HaskellFinalizers</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Finalizers are all Haskell functions.</span></span>
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"><span class="cd">-- | Controls finalization of a 'ForeignPtr', that is, what should happen</span></span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- if the 'ForeignPtr' becomes unreachable. Visually, these data constructors</span></span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- are appropriate in these scenarios:</span></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > Memory backing pointer is</span></span>
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113
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > GC-Managed Unmanaged</span></span>
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > Finalizer functions are: +------------+-----------------+</span></span>
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > Allowed | MallocPtr | PlainForeignPtr |</span></span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > +------------+-----------------+</span></span>
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117
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > Prohibited | PlainPtr | FinalPtr |</span></span>
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118
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > +------------+-----------------+</span></span>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">ForeignPtrContents</span></span>
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95
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PlainForeignPtr</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IORef</span> <span class="kt" style="color: #458; font-weight: 600;">Finalizers</span><span class="p">)</span></span>
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96
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<pre style="margin: 0;">-<span id="LC96" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MallocPtr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MutableByteArray</span><span class="o" style="font-weight: 600;">#</span> <span class="kt" style="color: #458; font-weight: 600;">RealWorld</span><span class="p">)</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IORef</span> <span class="kt" style="color: #458; font-weight: 600;">Finalizers</span><span class="p">)</span></span>
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97
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<pre style="margin: 0;">-<span id="LC97" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PlainPtr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MutableByteArray</span><span class="o" style="font-weight: 600;">#</span> <span class="kt" style="color: #458; font-weight: 600;">RealWorld</span><span class="p">)</span></span>
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121
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The pointer refers to unmanaged memory that was allocated by</span></span>
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122
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a foreign function (typically using @malloc@). The finalizer</span></span>
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123
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- frequently calls the C function @free@ or some variant of it.</span></span>
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124
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">FinalPtr</span></span>
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125
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The pointer refers to unmanaged memory that should not be freed when</span></span>
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<td class="diff-line-num new new_line" data-linenumber="126" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
126
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the 'ForeignPtr' becomes unreachable. Functions that add finalizers</span></span>
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127
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<pre style="margin: 0;">+<span id="LC127" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to a 'ForeignPtr' throw exceptions when the 'ForeignPtr' is backed by</span></span>
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128
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 'PlainPtr'Most commonly, this is used with @Addr#@ literals.</span></span>
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129
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Why FinalPtr].</span></span>
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130
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<pre style="margin: 0;">+<span id="LC130" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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131
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @since 4.15</span></span>
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132
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MallocPtr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MutableByteArray</span><span class="o" style="font-weight: 600;">#</span> <span class="kt" style="color: #458; font-weight: 600;">RealWorld</span><span class="p">)</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IORef</span> <span class="kt" style="color: #458; font-weight: 600;">Finalizers</span><span class="p">)</span></span>
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133
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The pointer refers to a byte array.</span></span>
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134
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The 'MutableByteArray#' field means that the 'MutableByteArray#' is</span></span>
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135
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- reachable (by GC) whenever the 'ForeignPtr' is reachable. When the</span></span>
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136
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 'ForeignPtr' becomes unreachable, the runtime\'s normal GC recovers</span></span>
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137
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the memory backing it. Here, the finalizer function intended to be used</span></span>
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138
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to @free()@ any ancilliary *unmanaged* memory pointed to by the</span></span>
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139
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 'MutableByteArray#'. See the @zlib@ library for an example of this use.</span></span>
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140
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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141
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 1. Invariant: The 'Addr#' in the parent 'ForeignPtr' is an interior</span></span>
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142
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pointer into this 'MutableByteArray#'.</span></span>
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 2. Invariant: The 'MutableByteArray#' is pinned, so the 'Addr#' does not</span></span>
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144
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- get invalidated by the GC moving the byte array.</span></span>
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145
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 3. Invariant: A 'MutableByteArray#' must not be associated with more than</span></span>
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146
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- one set of finalizers. For example, this is sound:</span></span>
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147
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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148
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- > incrGood :: ForeignPtr Word8 -> ForeignPtr Word8</span></span>
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149
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- > incrGood (ForeignPtr p (MallocPtr m f)) = ForeignPtr (plusPtr p 1) (MallocPtr m f)</span></span>
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150
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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151
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- But this is unsound:</span></span>
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152
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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153
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- > incrBad :: ForeignPtr Word8 -> IO (ForeignPtr Word8)</span></span>
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154
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- > incrBad (ForeignPtr p (MallocPtr m _)) = do</span></span>
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155
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- > f <- newIORef NoFinalizers</span></span>
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156
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- > pure (ForeignPtr p (MallocPtr m f))</span></span>
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157
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PlainPtr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MutableByteArray</span><span class="o" style="font-weight: 600;">#</span> <span class="kt" style="color: #458; font-weight: 600;">RealWorld</span><span class="p">)</span></span>
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158
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The pointer refers to a byte array. Finalization is not</span></span>
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159
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- supported. This optimizes @MallocPtr@ by avoiding the allocation</span></span>
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160
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<pre style="margin: 0;">+<span id="LC160" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of a @MutVar#@ when it is known that no one will add finalizers to</span></span>
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161
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the @ForeignPtr@. Functions that add finalizers to a 'ForeignPtr'</span></span>
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162
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- throw exceptions when the 'ForeignPtr' is backed by 'PlainPtr'.</span></span>
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163
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The invariants that apply to 'MallocPtr' apply to 'PlainPtr' as well.</span></span>
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164
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"></span>
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165
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Why FinalPtr]</span></span>
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166
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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167
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- FinalPtr exists as an optimization for foreign pointers created</span></span>
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168
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- from Addr# literals. Most commonly, this happens in the bytestring</span></span>
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169
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- library, where the combination of OverloadedStrings and a rewrite</span></span>
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170
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- rule overloads String literals as ByteString literals. See the</span></span>
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171
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- rule "ByteString packChars/packAddress" in</span></span>
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172
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- bytestring:Data.ByteString.Internal. Prior to the</span></span>
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173
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- introduction of FinalPtr, bytestring used PlainForeignPtr (in</span></span>
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<td class="diff-line-num new new_line" data-linenumber="174" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
174
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Data.ByteString.Internal.unsafePackAddress) to handle such literals.</span></span>
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175
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- With O2 optimization, the resulting Core from a GHC patched with a</span></span>
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176
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- known-key cstringLength# function but without FinalPtr looked like:</span></span>
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177
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<pre style="margin: 0;">+<span id="LC177" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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178
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- RHS size: {terms: 1, types: 0, coercions: 0, joins: 0/0}</span></span>
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179
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- stringOne1 = "hello beautiful world"#</span></span>
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180
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- RHS size: {terms: 11, types: 17, coercions: 0, joins: 0/0}</span></span>
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181
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- stringOne</span></span>
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182
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- = case newMutVar# NoFinalizers realWorld# of</span></span>
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183
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- { (# ipv_i7b6, ipv1_i7b7 #) -></span></span>
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<td class="diff-line-num new new_line" data-linenumber="184" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
184
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- PS stringOne1 (PlainForeignPtr ipv1_i7b7) 0# 21#</span></span>
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185
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<pre style="margin: 0;">+<span id="LC185" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- }</span></span>
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186
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<pre style="margin: 0;">+<span id="LC186" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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187
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<pre style="margin: 0;">+<span id="LC187" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- After the introduction of FinalPtr, the bytestring library was modified</span></span>
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188
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<pre style="margin: 0;">+<span id="LC188" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- so that the resulting Core was instead:</span></span>
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189
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<pre style="margin: 0;">+<span id="LC189" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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190
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<pre style="margin: 0;">+<span id="LC190" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- RHS size: {terms: 1, types: 0, coercions: 0, joins: 0/0}</span></span>
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191
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<pre style="margin: 0;">+<span id="LC191" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- stringOne1 = "hello beautiful world"#</span></span>
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192
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<pre style="margin: 0;">+<span id="LC192" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- RHS size: {terms: 5, types: 0, coercions: 0, joins: 0/0}</span></span>
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193
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<pre style="margin: 0;">+<span id="LC193" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- stringOne = PS stringOne1 FinalPtr 0# 21#</span></span>
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194
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<pre style="margin: 0;">+<span id="LC194" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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195
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<pre style="margin: 0;">+<span id="LC195" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This improves performance in three ways:</span></span>
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196
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<pre style="margin: 0;">+<span id="LC196" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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197
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<pre style="margin: 0;">+<span id="LC197" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 1. More optimization opportunities. GHC is willing to inline the FinalPtr</span></span>
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198
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<pre style="margin: 0;">+<span id="LC198" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- variant of stringOne into its use sites. This means the offset and length</span></span>
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199
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<pre style="margin: 0;">+<span id="LC199" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- are eligible for case-of-known-literal. Previously, this never happened.</span></span>
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200
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 2. Smaller binaries. Setting up the thunk to call newMutVar# required</span></span>
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201
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<pre style="margin: 0;">+<span id="LC201" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- machine instruction in the generated code. On x86_64, FinalPtr reduces</span></span>
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202
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<pre style="margin: 0;">+<span id="LC202" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the size of binaries by about 450 bytes per ByteString literal.</span></span>
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203
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<pre style="margin: 0;">+<span id="LC203" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 3. Smaller memory footprint. Previously, every ByteString literal resulted</span></span>
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204
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<pre style="margin: 0;">+<span id="LC204" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in the allocation of a MutVar# and a PlainForeignPtr data constructor.</span></span>
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205
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<pre style="margin: 0;">+<span id="LC205" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- These both hang around until the ByteString goes out of scope. FinalPtr</span></span>
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206
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<pre style="margin: 0;">+<span id="LC206" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- eliminates both of these sources of allocations. The MutVar# is not</span></span>
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207
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<pre style="margin: 0;">+<span id="LC207" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- allocated because FinalPtr does not allow it, and the data constructor</span></span>
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208
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- is not allocated because FinalPtr is a nullary data constructor.</span></span>
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209
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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210
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<pre style="margin: 0;">+<span id="LC210" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For more discussion of FinalPtr, see GHC MR #2165 and bytestring PR #191.</span></span>
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98
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211
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell"></span>
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99
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212
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<pre style="margin: 0;"> <span id="LC212" class="line" lang="haskell"><span class="cd">-- | @since 2.01</span></span>
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100
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213
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<pre style="margin: 0;"> <span id="LC213" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignPtr</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -259,7 +372,7 @@ addForeignPtrFinalizer :: FinalizerPtr a -> ForeignPtr a -> IO ()</td>
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259
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<pre style="margin: 0;"> <span id="LC372" class="line" lang="haskell"><span class="n" style="color: #333;">addForeignPtrFinalizer</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunPtr</span> <span class="n" style="color: #333;">fp</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignPtr</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">c</span> <span class="kr" style="font-weight: 600;">of</span></span>
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373
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<pre style="margin: 0;"> <span id="LC373" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PlainForeignPtr</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">insertCFinalizer</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">fp</span> <span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">nullAddr</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">p</span> <span class="nb" style="color: #0086b3;">()</span></span>
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261
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374
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<pre style="margin: 0;"> <span id="LC374" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MallocPtr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">insertCFinalizer</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">fp</span> <span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">nullAddr</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">c</span></span>
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262
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<pre style="margin: 0;">-<span id="LC262" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">errorWithoutStackTrace</span> <span class="s" style="color: #d14;">"GHC.ForeignPtr: attempt to add a finalizer to a plain pointer"</span></span>
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">errorWithoutStackTrace</span> <span class="s" style="color: #d14;">"GHC.ForeignPtr: attempt to add a finalizer to a plain pointer<span class="idiff left right"> or a final pointer</span>"</span></span>
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263
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376
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<pre style="margin: 0;"> <span id="LC376" class="line" lang="haskell"></span>
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264
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377
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<pre style="margin: 0;"> <span id="LC377" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [MallocPtr finalizers] (#10904)</span></span>
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265
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378
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<pre style="margin: 0;"> <span id="LC378" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -277,7 +390,7 @@ addForeignPtrFinalizerEnv ::</td>
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277
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390
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<pre style="margin: 0;"> <span id="LC390" class="line" lang="haskell"><span class="n" style="color: #333;">addForeignPtrFinalizerEnv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunPtr</span> <span class="n" style="color: #333;">fp</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">ep</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignPtr</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">c</span> <span class="kr" style="font-weight: 600;">of</span></span>
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278
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391
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<pre style="margin: 0;"> <span id="LC391" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PlainForeignPtr</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">insertCFinalizer</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">fp</span> <span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">ep</span> <span class="n" style="color: #333;">p</span> <span class="nb" style="color: #0086b3;">()</span></span>
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279
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392
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<pre style="margin: 0;"> <span id="LC392" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MallocPtr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">insertCFinalizer</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">fp</span> <span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">ep</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">c</span></span>
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<pre style="margin: 0;">-<span id="LC280" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">errorWithoutStackTrace</span> <span class="s" style="color: #d14;">"GHC.ForeignPtr: attempt to add a finalizer to a plain pointer"</span></span>
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<pre style="margin: 0;">+<span id="LC393" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">errorWithoutStackTrace</span> <span class="s" style="color: #d14;">"GHC.ForeignPtr: attempt to add a finalizer to a plain pointer<span class="idiff left right"> or a final pointer</span>"</span></span>
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281
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394
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<pre style="margin: 0;"> <span id="LC394" class="line" lang="haskell"></span>
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282
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<pre style="margin: 0;"> <span id="LC395" class="line" lang="haskell"><span class="n" style="color: #333;">addForeignPtrConcFinalizer</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ForeignPtr</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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283
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396
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<pre style="margin: 0;"> <span id="LC396" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^This function adds a finalizer to the given @ForeignPtr@. The</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="319" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="432" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -319,7 +432,7 @@ addForeignPtrConcFinalizer_ f@(MallocPtr fo r) finalizer = do</td>
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319
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<pre style="margin: 0;"> <span id="LC432" class="line" lang="haskell"> <span class="n" style="color: #333;">finalizer'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unIO</span> <span class="p">(</span><span class="n" style="color: #333;">foreignPtrFinalizer</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">>></span> <span class="n" style="color: #333;">touch</span> <span class="n" style="color: #333;">f</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC433" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC434" class="line" lang="haskell"><span class="n" style="color: #333;">addForeignPtrConcFinalizer_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC322" class="line" lang="haskell"> <span class="n" style="color: #333;">errorWithoutStackTrace</span> <span class="s" style="color: #d14;">"GHC.ForeignPtr: attempt to add a finalizer to plain pointer"</span></span>
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<pre style="margin: 0;">+<span id="LC435" class="line" lang="haskell"> <span class="n" style="color: #333;">errorWithoutStackTrace</span> <span class="s" style="color: #d14;">"GHC.ForeignPtr: attempt to add a finalizer to plain pointer<span class="idiff left right"> or a final pointer</span>"</span></span>
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436
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<pre style="margin: 0;"> <span id="LC436" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC437" class="line" lang="haskell"><span class="n" style="color: #333;">insertHaskellFinalizer</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IORef</span> <span class="kt" style="color: #458; font-weight: 600;">Finalizers</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC438" class="line" lang="haskell"><span class="n" style="color: #333;">insertHaskellFinalizer</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -345,6 +458,8 @@ insertCFinalizer r fp flag ep p val = do</td>
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458
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<pre style="margin: 0;"> <span id="LC458" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- replaced the content of r before calling finalizeWeak#.</span></span>
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346
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459
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<pre style="margin: 0;"> <span id="LC459" class="line" lang="haskell"> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">s1</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unIO</span> <span class="p">(</span><span class="n" style="color: #333;">insertCFinalizer</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">fp</span> <span class="n" style="color: #333;">flag</span> <span class="n" style="color: #333;">ep</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">val</span><span class="p">)</span> <span class="n" style="color: #333;">s1</span></span>
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460
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<pre style="margin: 0;"> <span id="LC460" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC461" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Read the weak reference from an IORef Finalizers, creating it if necessary.</span></span>
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<pre style="margin: 0;">+<span id="LC462" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Throws an exception if HaskellFinalizers is encountered.</span></span>
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<pre style="margin: 0;"> <span id="LC463" class="line" lang="haskell"><span class="n" style="color: #333;">ensureCFinalizerWeak</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IORef</span> <span class="kt" style="color: #458; font-weight: 600;">Finalizers</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">value</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">MyWeak</span></span>
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<pre style="margin: 0;"> <span id="LC464" class="line" lang="haskell"><span class="n" style="color: #333;">ensureCFinalizerWeak</span> <span class="n" style="color: #333;">ref</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IORef</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">STRef</span> <span class="n" style="color: #333;">r</span><span class="o" style="font-weight: 600;">#</span><span class="p">))</span> <span class="n" style="color: #333;">value</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC465" class="line" lang="haskell"> <span class="n" style="color: #333;">fin</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readIORef</span> <span class="n" style="color: #333;">ref</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -370,6 +485,7 @@ noMixingError = errorWithoutStackTrace $</td>
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370
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485
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<pre style="margin: 0;"> <span id="LC485" class="line" lang="haskell"> <span class="s" style="color: #d14;">"GHC.ForeignPtr: attempt to mix Haskell and C finalizers "</span> <span class="o" style="font-weight: 600;">++</span></span>
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371
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486
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<pre style="margin: 0;"> <span id="LC486" class="line" lang="haskell"> <span class="s" style="color: #d14;">"in the same ForeignPtr"</span></span>
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487
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<pre style="margin: 0;"> <span id="LC487" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC488" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Swap out the finalizers with NoFinalizers and then run them.</span></span>
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<pre style="margin: 0;"> <span id="LC489" class="line" lang="haskell"><span class="n" style="color: #333;">foreignPtrFinalizer</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IORef</span> <span class="kt" style="color: #458; font-weight: 600;">Finalizers</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC490" class="line" lang="haskell"><span class="n" style="color: #333;">foreignPtrFinalizer</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC491" class="line" lang="haskell"> <span class="n" style="color: #333;">fs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">atomicSwapIORef</span> <span class="n" style="color: #333;">r</span> <span class="kt" style="color: #458; font-weight: 600;">NoFinalizers</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -455,13 +571,53 @@ plusForeignPtr :: ForeignPtr a -> Int -> ForeignPtr b</td>
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<pre style="margin: 0;"> <span id="LC571" class="line" lang="haskell"><span class="n" style="color: #333;">plusForeignPtr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignPtr</span> <span class="n" style="color: #333;">addr</span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">d</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ForeignPtr</span> <span class="p">(</span><span class="n" style="color: #333;">plusAddr</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">addr</span> <span class="n" style="color: #333;">d</span><span class="p">)</span> <span class="n" style="color: #333;">c</span></span>
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<pre style="margin: 0;"> <span id="LC572" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC573" class="line" lang="haskell"><span class="cd">-- | Causes the finalizers associated with a foreign pointer to be run</span></span>
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<pre style="margin: 0;">-<span id="LC458" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- immediately.</span></span>
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<pre style="margin: 0;">+<span id="LC574" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- immediately. The foreign pointer must not be used again after this</span></span>
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<pre style="margin: 0;">+<span id="LC575" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- function is called.</span></span>
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<pre style="margin: 0;"> <span id="LC576" class="line" lang="haskell"><span class="n" style="color: #333;">finalizeForeignPtr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ForeignPtr</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC460" class="line" lang="haskell"><span class="n" style="color: #333;">finalizeForeignPtr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignPtr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PlainPtr</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- no effect</span></span>
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<pre style="margin: 0;">-<span id="LC461" class="line" lang="haskell"><span class="n" style="color: #333;">finalizeForeignPtr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignPtr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">foreignPtr</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foreignPtrFinalizer</span> <span class="n" style="color: #333;">refFinalizers</span></span>
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<pre style="margin: 0;">-<span id="LC462" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC463" class="line" lang="haskell"> <span class="n" style="color: #333;">refFinalizers</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">foreignPtr</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC464" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PlainForeignPtr</span> <span class="n" style="color: #333;">ref</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ref</span></span>
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<pre style="margin: 0;">-<span id="LC465" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MallocPtr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ref</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ref</span></span>
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<pre style="margin: 0;">-<span id="LC466" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PlainPtr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC467" class="line" lang="haskell"> <span class="n" style="color: #333;">errorWithoutStackTrace</span> <span class="s" style="color: #d14;">"finalizeForeignPtr PlainPtr"</span></span></pre>
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<pre style="margin: 0;">+<span id="LC577" class="line" lang="haskell"><span class="n" style="color: #333;">finalizeForeignPtr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignPtr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">c</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC578" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PlainForeignPtr</span> <span class="n" style="color: #333;">ref</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">foreignPtrFinalizer</span> <span class="n" style="color: #333;">ref</span></span>
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<pre style="margin: 0;">+<span id="LC579" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MallocPtr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ref</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">foreignPtrFinalizer</span> <span class="n" style="color: #333;">ref</span></span>
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<pre style="margin: 0;">+<span id="LC580" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">errorWithoutStackTrace</span> <span class="s" style="color: #d14;">"finalizeForeignPtr PlainPtr"</span></span>
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581
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<pre style="margin: 0;">+<span id="LC581" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC582" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- $commentary</span></span>
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583
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<pre style="margin: 0;">+<span id="LC583" class="line" lang="haskell"></span>
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584
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<pre style="margin: 0;">+<span id="LC584" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is a high-level overview of how 'ForeignPtr' works.</span></span>
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585
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<pre style="margin: 0;">+<span id="LC585" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The implementation of 'ForeignPtr' must accomplish several goals:</span></span>
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586
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<pre style="margin: 0;">+<span id="LC586" class="line" lang="haskell"></span>
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587
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<pre style="margin: 0;">+<span id="LC587" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. Invoke a finalizer once a foreign pointer becomes unreachable.</span></span>
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588
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<pre style="margin: 0;">+<span id="LC588" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. Support augmentation of finalizers, i.e. 'addForeignPtrFinalizer'.</span></span>
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589
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<pre style="margin: 0;">+<span id="LC589" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> As a motivating example, suppose that the payload of a foreign</span></span>
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590
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<pre style="margin: 0;">+<span id="LC590" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pointer is C struct @bar@ that has an optionally NULL pointer field</span></span>
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591
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<pre style="margin: 0;">+<span id="LC591" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> @foo@ to an unmanaged heap object. Initially, @foo@ is NULL, and</span></span>
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592
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<pre style="margin: 0;">+<span id="LC592" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> later the program uses @malloc@, initializes the object, and assigns</span></span>
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593
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<pre style="margin: 0;">+<span id="LC593" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> @foo@ the address returned by @malloc@. When the foreign pointer</span></span>
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594
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<pre style="margin: 0;">+<span id="LC594" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> becomes unreachable, it is now necessary to first @free@ the object</span></span>
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595
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<pre style="margin: 0;">+<span id="LC595" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pointed to by @foo@ and then invoke whatever finalizer was associated</span></span>
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596
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<pre style="margin: 0;">+<span id="LC596" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> with @bar@. That is, finalizers must be invoked in the opposite order</span></span>
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597
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<pre style="margin: 0;">+<span id="LC597" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> they are added.</span></span>
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598
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<pre style="margin: 0;">+<span id="LC598" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. Allow users to invoke a finalizer promptly if they know that the</span></span>
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599
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<pre style="margin: 0;">+<span id="LC599" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foreign pointer is unreachable, i.e. 'finalizeForeignPtr'.</span></span>
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600
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<pre style="margin: 0;">+<span id="LC600" class="line" lang="haskell"></span>
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601
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<pre style="margin: 0;">+<span id="LC601" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">How can these goals be accomplished? Goal 1 suggests that weak references</span></span>
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602
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<pre style="margin: 0;">+<span id="LC602" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and finalizers (via 'Weak#' and 'mkWeak#') are necessary. But how should</span></span>
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603
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<pre style="margin: 0;">+<span id="LC603" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">they be used and what should their key be? Certainly not 'ForeignPtr' or</span></span>
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<pre style="margin: 0;">+<span id="LC604" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'ForeignPtrContents'. See the warning in "GHC.Weak" about weak pointers with</span></span>
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605
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">lifted (non-primitive) keys. The two finalizer-supporting data constructors of</span></span>
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606
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<pre style="margin: 0;">+<span id="LC606" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'ForeignPtr' have an @'IORef' 'Finalizers'@ (backed by 'MutVar#') field.</span></span>
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607
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<pre style="margin: 0;">+<span id="LC607" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This gets used in two different ways depending on the kind of finalizer:</span></span>
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608
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<pre style="margin: 0;">+<span id="LC608" class="line" lang="haskell"></span>
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609
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<pre style="margin: 0;">+<span id="LC609" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* 'HaskellFinalizers': The first @addForeignPtrConcFinalizer_@ call uses</span></span>
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610
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<pre style="margin: 0;">+<span id="LC610" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'mkWeak#' to attach the finalizer @foreignPtrFinalizer@ to the 'MutVar#'.</span></span>
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611
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<pre style="margin: 0;">+<span id="LC611" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The resulting 'Weak#' is discarded (see @addForeignPtrConcFinalizer_@).</span></span>
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612
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<pre style="margin: 0;">+<span id="LC612" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Subsequent calls to @addForeignPtrConcFinalizer_@ (goal 2) just add</span></span>
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613
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<pre style="margin: 0;">+<span id="LC613" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> finalizers onto the list in the 'HaskellFinalizers' data constructor.</span></span>
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614
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<pre style="margin: 0;">+<span id="LC614" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* 'CFinalizers': The first 'addForeignPtrFinalizer' call uses</span></span>
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615
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<pre style="margin: 0;">+<span id="LC615" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'mkWeakNoFinalizer#' to create a 'Weak#'. The 'Weak#' is preserved in the</span></span>
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616
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<pre style="margin: 0;">+<span id="LC616" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'CFinalizers' data constructor. Both the first call and subsequent</span></span>
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617
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<pre style="margin: 0;">+<span id="LC617" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> calls (goal 2) use 'addCFinalizerToWeak#' to attach finalizers to the</span></span>
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618
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<pre style="margin: 0;">+<span id="LC618" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'Weak#' itself. Also, see Note [MallocPtr finalizers] for discussion of</span></span>
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619
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<pre style="margin: 0;">+<span id="LC619" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the key and value of this 'Weak#'.</span></span>
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620
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<pre style="margin: 0;">+<span id="LC620" class="line" lang="haskell"></span>
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621
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<pre style="margin: 0;">+<span id="LC621" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In either case, the runtime invokes the appropriate finalizers when the</span></span>
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622
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<pre style="margin: 0;">+<span id="LC622" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'ForeignPtr' becomes unreachable.</span></span>
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623
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<pre style="margin: 0;">+<span id="LC623" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded#5550456b4c18a3437d117712bc1421c71cca5d98"><strong>libraries/ghc-prim/GHC/CString.hs</strong></a>
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1
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<pre style="margin: 0;">-<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MagicHash, NoImplicitPrelude, BangPatterns #-}</span></span>
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2
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MagicHash, NoImplicitPrelude, BangPatterns, UnliftedFFITypes #-}</span></span>
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3
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"><span class="cd">-- |</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Module : GHC.CString</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -18,7 +17,7 @@</td>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.CString</span> <span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">unpackCString</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">unpackAppendCString</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">unpackFoldrCString</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">unpackCStringUtf8</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">unpackNBytes</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">unpackCStringUtf8</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">unpackNBytes</span><span class="o" style="font-weight: 600;">#</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">cstringLength</span></span><span class="o" style="font-weight: 600;"><span class="idiff right">#</span></span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -174,3 +173,17 @@ unpackNBytes# addr len# = unpack [] (len# -# 1#)</td>
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">indexCharOffAddr</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">addr</span> <span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;">#</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"> <span class="n" style="color: #333;">ch</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unpack</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">C</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">ch</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">acc</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">-#</span> <span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The return type is not correct here. We really want CSize,</span></span>
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<pre style="margin: 0;">+<span id="LC177" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- but that type is defined in base. However, CSize should always</span></span>
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- match the size of a machine word (I hope), so this is probably</span></span>
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- alright on all platforms that GHC supports.</span></span>
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="haskell"><span class="n" style="color: #333;">foreign</span> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ccall</span> <span class="n" style="color: #333;">unsafe</span> <span class="s" style="color: #d14;">"strlen"</span> <span class="n" style="color: #333;">c_strlen</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Addr</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="haskell"><span class="cd">-- | Compute the length of a NUL-terminated string. This address</span></span>
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- must refer to immutable memory. GHC includes a built-in rule for</span></span>
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184
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- constant folding when the argument is a statically-known literal.</span></span>
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<pre style="margin: 0;">+<span id="LC185" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- That is, a core-to-core pass reduces the expression</span></span>
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<pre style="margin: 0;">+<span id="LC186" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @cstringLength# "hello"#@ to the constant @5#@.</span></span>
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<pre style="margin: 0;">+<span id="LC187" class="line" lang="haskell"><span class="n" style="color: #333;">cstringLength</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Addr</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">+<span id="LC188" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE[0] cstringLength# #-}</span></span>
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189
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<pre style="margin: 0;">+<span id="LC189" class="line" lang="haskell"><span class="n" style="color: #333;">cstringLength</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">c_strlen</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded#54f2593fa6d429b2b82cc2200e8bcda0f38854de"><strong>libraries/ghc-prim/changelog.md</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">## 0.6.2 (edit as necessary)</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="markdown"><span class="p">-</span> Shipped with GHC 8.12.1</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="markdown"><span class="p">-</span> Add known-key <span class="sb" style="color: #d14;">`cstringLength#`</span> to <span class="sb" style="color: #d14;">`GHC.CString`</span>. This is just the</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="markdown"> C function <span class="sb" style="color: #d14;">`strlen`</span>, but a built-in rewrite rule allows GHC to</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="markdown"> compute the result at compile time when the argument is known.</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="markdown"></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">## 0.6.1 (edit as necessary)</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="markdown"></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="markdown"><span class="p">-</span> Shipped with GHC 8.10.1</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded#daeb140bfe6f19db486a97bdd268061b7bb41ba0"><strong>testsuite/.gitignore</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -43,6 +43,7 @@ Thumbs.db</td>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="plaintext">*.prof.sample.normalised</span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="plaintext">*.run.stdout</span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext">*.run.stderr</span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="plaintext">*.dump-simpl</span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="plaintext">*.hp</span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="plaintext">tests/**/*.ps</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded#c591f85f122007bac88228c5ff6fd76b40e6a811"><strong>testsuite/driver/testlib.py</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1344,6 +1344,26 @@ def compile_grep_asm(name: TestName,</td>
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<pre style="margin: 0;"> <span id="LC1344" class="line" lang="python"> <span class="c1" style="color: #998; font-style: italic;"># no problems found, this test passed</span></span>
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<pre style="margin: 0;"> <span id="LC1345" class="line" lang="python"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">passed</span><span class="p">()</span></span>
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<pre style="margin: 0;"> <span id="LC1346" class="line" lang="python"></span>
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<pre style="margin: 0;">+<span id="LC1347" class="line" lang="python"><span class="k" style="font-weight: 600;">def</span> <span class="nf" style="color: #900; font-weight: 600;">compile_grep_core</span><span class="p">(</span><span class="n" style="color: #333;">name</span><span class="p">:</span> <span class="n" style="color: #333;">TestName</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC1348" class="line" lang="python"> <span class="n" style="color: #333;">way</span><span class="p">:</span> <span class="n" style="color: #333;">WayName</span><span class="p">,</span></span>
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1349
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<pre style="margin: 0;">+<span id="LC1349" class="line" lang="python"> <span class="n" style="color: #333;">extra_hc_opts</span><span class="p">:</span> <span class="nb" style="color: #0086b3;">str</span></span>
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<pre style="margin: 0;">+<span id="LC1350" class="line" lang="python"> <span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">PassFail</span><span class="p">:</span></span>
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<pre style="margin: 0;">+<span id="LC1351" class="line" lang="python"> <span class="k" style="font-weight: 600;">print</span><span class="p">(</span><span class="s" style="color: #d14;">'Compile only, extra args = '</span><span class="p">,</span> <span class="n" style="color: #333;">extra_hc_opts</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1352" class="line" lang="python"> <span class="n" style="color: #333;">result</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simple_build</span><span class="p">(</span><span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">+</span> <span class="s" style="color: #d14;">'.hs'</span><span class="p">,</span> <span class="n" style="color: #333;">way</span><span class="p">,</span> <span class="s" style="color: #d14;">'-ddump-to-file -dsuppress-all -ddump-simpl -O '</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">extra_hc_opts</span><span class="p">,</span> <span class="bp" style="color: #999;">False</span><span class="p">,</span> <span class="bp" style="color: #999;">None</span><span class="p">,</span> <span class="bp" style="color: #999;">False</span><span class="p">,</span> <span class="bp" style="color: #999;">False</span><span class="p">)</span></span>
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1353
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<pre style="margin: 0;">+<span id="LC1353" class="line" lang="python"></span>
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<pre style="margin: 0;">+<span id="LC1354" class="line" lang="python"> <span class="k" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">badResult</span><span class="p">(</span><span class="n" style="color: #333;">result</span><span class="p">):</span></span>
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<pre style="margin: 0;">+<span id="LC1355" class="line" lang="python"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">result</span></span>
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<pre style="margin: 0;">+<span id="LC1356" class="line" lang="python"></span>
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<pre style="margin: 0;">+<span id="LC1357" class="line" lang="python"> <span class="n" style="color: #333;">expected_pat_file</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">find_expected_file</span><span class="p">(</span><span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="s" style="color: #d14;">'substr-simpl'</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1358" class="line" lang="python"> <span class="n" style="color: #333;">actual_core_file</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">add_suffix</span><span class="p">(</span><span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="s" style="color: #d14;">'dump-simpl'</span><span class="p">)</span></span>
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1359
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<pre style="margin: 0;">+<span id="LC1359" class="line" lang="python"></span>
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1360
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<pre style="margin: 0;">+<span id="LC1360" class="line" lang="python"> <span class="k" style="font-weight: 600;">if</span> <span class="ow" style="font-weight: 600;">not</span> <span class="n" style="color: #333;">grep_output</span><span class="p">(</span><span class="n" style="color: #333;">join_normalisers</span><span class="p">(</span><span class="n" style="color: #333;">normalise_errmsg</span><span class="p">),</span></span>
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1361
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<pre style="margin: 0;">+<span id="LC1361" class="line" lang="python"> <span class="n" style="color: #333;">expected_pat_file</span><span class="p">,</span> <span class="n" style="color: #333;">actual_core_file</span><span class="p">):</span></span>
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<pre style="margin: 0;">+<span id="LC1362" class="line" lang="python"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">failBecause</span><span class="p">(</span><span class="s" style="color: #d14;">'simplified core mismatch'</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1363" class="line" lang="python"></span>
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<pre style="margin: 0;">+<span id="LC1364" class="line" lang="python"> <span class="c1" style="color: #998; font-style: italic;"># no problems found, this test passed</span></span>
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<pre style="margin: 0;">+<span id="LC1365" class="line" lang="python"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">passed</span><span class="p">()</span></span>
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<pre style="margin: 0;">+<span id="LC1366" class="line" lang="python"></span>
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<pre style="margin: 0;"> <span id="LC1367" class="line" lang="python"><span class="c1" style="color: #998; font-style: italic;"># -----------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC1368" class="line" lang="python"><span class="c1" style="color: #998; font-style: italic;"># Compile-and-run tests</span></span>
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<pre style="margin: 0;"> <span id="LC1369" class="line" lang="python"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded#b115a1163b6ea8fe266ae5e6cbd11f751fb589c1"><strong>testsuite/tests/primops/should_gen_core/CStringLength_core.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# language MagicHash #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">CStringLengthCore</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">ozymandias</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">ozymandias</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">ozymandias</span> <span class="o" style="font-weight: 600;">=</span></span>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">cstringLength</span><span class="o" style="font-weight: 600;">#</span> <span class="s" style="color: #d14;">"I met a traveller from an antique land"</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded#645bd59dbbb050e4a4a8d9f54654a9b98b748a85"><strong>testsuite/tests/primops/should_gen_core/CStringLength_core.substr-simpl</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">I# 38#</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded#73f13538e53a9aee1c6bfce449e6080440f27c51"><strong>testsuite/tests/primops/should_gen_core/all.T</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">CStringLength_core</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_grep_core</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded#14271bae21dd61cfeac56241725313f6c1b14a12"><strong>testsuite/tests/primops/should_run/CStringLength.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE BangPatterns #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MagicHash #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UnboxedTuples #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="n" style="color: #333;">putStr</span> <span class="s" style="color: #d14;">"A: "</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">cstringLength</span><span class="o" style="font-weight: 600;">#</span> <span class="s" style="color: #d14;">"hello_world"</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">==</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="n" style="color: #333;">naiveStrlen</span> <span class="s" style="color: #d14;">"hello_world"</span><span class="o" style="font-weight: 600;">#</span> <span class="mi" style="color: #099;">0</span></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="n" style="color: #333;">putStr</span> <span class="s" style="color: #d14;">"B: "</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="o" style="font-weight: 600;">$</span></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">cstringLength</span><span class="o" style="font-weight: 600;">#</span> <span class="s" style="color: #d14;">"aaaaaaaaaaaaa</span><span class="se" style="color: #d14;">\x00b</span><span class="s" style="color: #d14;">"</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">==</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="n" style="color: #333;">naiveStrlen</span> <span class="s" style="color: #d14;">"aaaaaaaaaaaaa</span><span class="se" style="color: #d14;">\x00b</span><span class="s" style="color: #d14;">"</span><span class="o" style="font-weight: 600;">#</span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="n" style="color: #333;">putStr</span> <span class="s" style="color: #d14;">"C: "</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">cstringLength</span><span class="o" style="font-weight: 600;">#</span> <span class="s" style="color: #d14;">"cccccccccccccccccc</span><span class="se" style="color: #d14;">\x00b</span><span class="s" style="color: #d14;">"</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">==</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"> <span class="n" style="color: #333;">naiveStrlen</span> <span class="s" style="color: #d14;">"cccccccccccccccccc</span><span class="se" style="color: #d14;">\x00b</span><span class="s" style="color: #d14;">"</span><span class="o" style="font-weight: 600;">#</span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"> <span class="n" style="color: #333;">putStr</span> <span class="s" style="color: #d14;">"D: "</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">cstringLength</span><span class="o" style="font-weight: 600;">#</span> <span class="s" style="color: #d14;">"araña</span><span class="se" style="color: #d14;">\NUL</span><span class="s" style="color: #d14;">b"</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">==</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"> <span class="n" style="color: #333;">naiveStrlen</span> <span class="s" style="color: #d14;">"araña</span><span class="se" style="color: #d14;">\NUL</span><span class="s" style="color: #d14;">b"</span><span class="o" style="font-weight: 600;">#</span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="n" style="color: #333;">naiveStrlen</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Addr</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="n" style="color: #333;">naiveStrlen</span> <span class="n" style="color: #333;">addr</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">indexWord8OffAddr</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">addr</span> <span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">#</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"> <span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">##</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">n</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">naiveStrlen</span> <span class="p">(</span><span class="n" style="color: #333;">plusAddr</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">addr</span> <span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span></span></pre>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">A: True</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">B: True</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">C: True</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">D: True</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded#98e52aadad6ed0677c8e810ba5f46030fd516bdd"><strong>testsuite/tests/primops/should_run/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -29,3 +29,4 @@ test('CmpWord16', normal, compile_and_run, [''])</td>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ShrinkSmallMutableArrayA</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ShrinkSmallMutableArrayB</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T14664</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">CStringLength</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-O2</span><span class="p">'])</span></span></pre>
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