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<h3>
Sven Tennie pushed to branch wip/stack_cloning
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4b5e678aeb39b8a850c8461eeefa788e4af15c91">4b5e678a</a></strong>
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<span>by Sven Tennie</span>
<i>at 2020-09-27T17:23:51+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unneccesary primop cloneThreadStack# (#18741)
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ff9eb1a2306a001236d606432e915ff5f27df39a">ff9eb1a2</a></strong>
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<span>by Sven Tennie</span>
<i>at 2020-10-03T16:56:57+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add cloneThreadStack and cloneMyStack
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<h4>20 changed files:</h4>
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<li class="file-stats">
<a href="#451725cc4e5d443a3b7c2adcdf224840f953b7e2">
compiler/GHC/Builtin/primops.txt.pp
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<li class="file-stats">
<a href="#d12a108e34fe83acc9c99357ae841e22a0af0a23">
compiler/GHC/StgToCmm/Prim.hs
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<li class="file-stats">
<a href="#0ea78c0eb38d298692960f63f47248f6464a0479">
includes/rts/storage/Closures.h
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<li class="file-stats">
<a href="#89ed911ca15ec0db941eb82e8d7df8453f4ab713">
includes/stg/MiscClosures.h
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<a href="#484e50173b324b5842d294580ec9ed8a7b0d5d38">
libraries/base/GHC/Conc/Sync.hs
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<li class="file-stats">
<a href="#9cc5887db9e4af2e8d686d9953728d48fd50dd64">
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libraries/base/GHC/Stack/CloneStack.hs
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<a href="#b7cfb47853ef95330e499ca0c5b90964744d101f">
libraries/base/base.cabal
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<a href="#864e56410efaa16e354282a06a222376524fc186">
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rts/CloneStack.c
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rts/CloneStack.h
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<a href="#63bb2dcb45bf7982130b0b95ecf366bf1a617e82">
rts/Messages.c
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<a href="#6db965f97cbab901f493506a385bcf1283009921">
rts/PrimOps.cmm
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<a href="#1f366bc5cc9fea123d6a6ab6c25b1483994867d5">
rts/Printer.c
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<a href="#084edb42735a765a977db3713b293347089e6c3b">
rts/Printer.h
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<a href="#6ca006a5d6dfdfdb97d0dd72db322e3f6eaa6214">
rts/StgMiscClosures.cmm
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<li class="file-stats">
<a href="#a5d219117032120cc7bde9f13451d9627cff5614">
rts/Threads.c
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<a href="#e432c7b248b68100c3cc37db36ee80d975efd697">
rts/rts.cabal.in
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<a href="#5ced844c5529162410276a1236ca9b8e7186490c">
testsuite/tests/rts/all.T
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<a href="#67df7943ba73891a07f3727afc5a3069c29051ac">
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testsuite/tests/rts/cloneMyStack.hs
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<a href="#da2af4490eb0e17c0307765ca5e1be1ca9b978ee">
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testsuite/tests/rts/cloneStackLib.c
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<a href="#60f10ee48feb16d809a4eccfe717c69d79799369">
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testsuite/tests/rts/cloneThreadStack.hs
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<h4>Changes:</h4>
<li id="451725cc4e5d443a3b7c2adcdf224840f953b7e2">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4cd2c222e8f23d0ec73ca35694baa1cdc35e1c82...ff9eb1a2306a001236d606432e915ff5f27df39a#451725cc4e5d443a3b7c2adcdf224840f953b7e2"><strong>compiler/GHC/Builtin/primops.txt.pp</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">@@ -3586,13 +3586,6 @@ primop CloneMyStack "cloneMyStack#" GenPrimOp</td>
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<pre style="margin: 0;"> <span id="LC3586" class="line" lang="puppet"> <span class="n" style="color: #333;">has_side_effects</span> <span class="o" style="font-weight: 600;">=</span> <span class="nc" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;"> <span id="LC3587" class="line" lang="puppet"> <span class="n" style="color: #333;">out_of_line</span> <span class="o" style="font-weight: 600;">=</span> <span class="nc" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;"> <span id="LC3588" class="line" lang="puppet"></span>
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<pre style="margin: 0;">-<span id="LC3589" class="line" lang="puppet"><span class="n" style="color: #333;">primop</span> <span class="nc" style="color: #458; font-weight: 600;">CloneThreadStack</span> <span class="s2" style="color: #d14;">"cloneThreadStack#"</span> <span class="nc" style="color: #458; font-weight: 600;">GenPrimOp</span></span>
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3590
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<pre style="margin: 0;">-<span id="LC3590" class="line" lang="puppet"> <span class="nc" style="color: #458; font-weight: 600;">ThreadId</span><span class="c" style="color: #998; font-style: italic;"># -> State# RealWorld -> (# State# RealWorld, StackSnapshot# #)</span></span>
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<pre style="margin: 0;">-<span id="LC3591" class="line" lang="puppet"> <span class="p">{</span> <span class="nc" style="color: #458; font-weight: 600;">Clones</span> <span class="n" style="color: #333;">the</span> <span class="n" style="color: #333;">stack</span> <span class="n" style="color: #333;">of</span> <span class="n" style="color: #333;">a</span> <span class="nc" style="color: #458; font-weight: 600;">Haskell</span> <span class="n" style="color: #333;">thread</span><span class="o" style="font-weight: 600;">.</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC3592" class="line" lang="puppet"> <span class="n" style="color: #333;">with</span></span>
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<pre style="margin: 0;">-<span id="LC3593" class="line" lang="puppet"> <span class="n" style="color: #333;">has_side_effects</span> <span class="o" style="font-weight: 600;">=</span> <span class="nc" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">-<span id="LC3594" class="line" lang="puppet"> <span class="n" style="color: #333;">out_of_line</span> <span class="o" style="font-weight: 600;">=</span> <span class="nc" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">-<span id="LC3595" class="line" lang="puppet"></span>
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<pre style="margin: 0;"> <span id="LC3589" class="line" lang="puppet"></span>
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<pre style="margin: 0;"> <span id="LC3590" class="line" lang="puppet"><span class="o" style="font-weight: 600;">------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC3591" class="line" lang="puppet"><span class="n" style="color: #333;">section</span> <span class="s2" style="color: #d14;">"Safe coercions"</span></span>
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<li id="d12a108e34fe83acc9c99357ae841e22a0af0a23">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4cd2c222e8f23d0ec73ca35694baa1cdc35e1c82...ff9eb1a2306a001236d606432e915ff5f27df39a#d12a108e34fe83acc9c99357ae841e22a0af0a23"><strong>compiler/GHC/StgToCmm/Prim.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">@@ -1518,7 +1518,6 @@ emitPrimOp dflags primop = case primop of</td>
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<pre style="margin: 0;"> <span id="LC1518" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TraceMarkerOp</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">alwaysExternal</span></span>
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<pre style="margin: 0;"> <span id="LC1519" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SetThreadAllocationCounter</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">alwaysExternal</span></span>
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<pre style="margin: 0;"> <span id="LC1520" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CloneMyStack</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">alwaysExternal</span></span>
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<pre style="margin: 0;">-<span id="LC1521" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CloneThreadStack</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">alwaysExternal</span></span>
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<pre style="margin: 0;"> <span id="LC1521" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1522" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1523
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<pre style="margin: 0;"> <span id="LC1523" class="line" lang="haskell"> <span class="n" style="color: #333;">profile</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">targetProfile</span> <span class="n" style="color: #333;">dflags</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4cd2c222e8f23d0ec73ca35694baa1cdc35e1c82...ff9eb1a2306a001236d606432e915ff5f27df39a#0ea78c0eb38d298692960f63f47248f6464a0479"><strong>includes/rts/storage/Closures.h</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">@@ -431,6 +431,14 @@ typedef struct MessageBlackHole_ {</td>
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<pre style="margin: 0;"> <span id="LC431" class="line" lang="c"> <span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">bh</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC432" class="line" lang="c"><span class="p">}</span> <span class="n" style="color: #333;">MessageBlackHole</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC433" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC434" class="line" lang="c"><span class="k" style="font-weight: 600;">typedef</span> <span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">MessageCloneStack_</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC435" class="line" lang="c"> <span class="n" style="color: #333;">StgHeader</span> <span class="n" style="color: #333;">header</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC436" class="line" lang="c"> <span class="n" style="color: #333;">Message</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">link</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC437" class="line" lang="c"> <span class="n" style="color: #333;">StgMVar</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">result</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC438" class="line" lang="c"> <span class="n" style="color: #333;">StgTSO</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">tso</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC439" class="line" lang="c"><span class="p">}</span> <span class="n" style="color: #333;">MessageCloneStack</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC440" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC442" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* ----------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC443" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> Compact Regions</span></span>
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<pre style="margin: 0;"> <span id="LC444" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> ------------------------------------------------------------------------- */</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4cd2c222e8f23d0ec73ca35694baa1cdc35e1c82...ff9eb1a2306a001236d606432e915ff5f27df39a#89ed911ca15ec0db941eb82e8d7df8453f4ab713"><strong>includes/stg/MiscClosures.h</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">@@ -129,6 +129,7 @@ RTS_ENTRY(stg_STM_AWOKEN);</td>
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="c"><span class="n" style="color: #333;">RTS_ENTRY</span><span class="p">(</span><span class="n" style="color: #333;">stg_MSG_TRY_WAKEUP</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="c"><span class="n" style="color: #333;">RTS_ENTRY</span><span class="p">(</span><span class="n" style="color: #333;">stg_MSG_THROWTO</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="c"><span class="n" style="color: #333;">RTS_ENTRY</span><span class="p">(</span><span class="n" style="color: #333;">stg_MSG_BLACKHOLE</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="c"><span class="n" style="color: #333;">RTS_ENTRY</span><span class="p">(</span><span class="n" style="color: #333;">stg_MSG_CLONE_STACK</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="c"><span class="n" style="color: #333;">RTS_ENTRY</span><span class="p">(</span><span class="n" style="color: #333;">stg_MSG_NULL</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="c"><span class="n" style="color: #333;">RTS_ENTRY</span><span class="p">(</span><span class="n" style="color: #333;">stg_MVAR_TSO_QUEUE</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="c"><span class="n" style="color: #333;">RTS_ENTRY</span><span class="p">(</span><span class="n" style="color: #333;">stg_catch</span><span class="p">);</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4cd2c222e8f23d0ec73ca35694baa1cdc35e1c82...ff9eb1a2306a001236d606432e915ff5f27df39a#484e50173b324b5842d294580ec9ed8a7b0d5d38"><strong>libraries/base/GHC/Conc/Sync.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">@@ -624,7 +624,7 @@ data PrimMVar</td>
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<pre style="margin: 0;"> <span id="LC624" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @hs_try_putmvar()@. The RTS wants a 'StablePtr' to the underlying</span></span>
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<pre style="margin: 0;"> <span id="LC625" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'MVar#', but a 'StablePtr#' can only refer to lifted types, so we</span></span>
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<pre style="margin: 0;"> <span id="LC626" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- have to cheat by coercing.</span></span>
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<pre style="margin: 0;">-<span id="LC627" class="line" lang="haskell"><span class="n" style="color: #333;">newStablePtrPrimMVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">MVar</span> <span class="nb" style="color: #0086b3;"><span class="idiff left right">()</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StablePtr</span> <span class="kt" style="color: #458; font-weight: 600;">PrimMVar</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC627" class="line" lang="haskell"><span class="n" style="color: #333;">newStablePtrPrimMVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">MVar</span> <span class="n" style="color: #333;"><span class="idiff left right">a</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StablePtr</span> <span class="kt" style="color: #458; font-weight: 600;">PrimMVar</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC628" class="line" lang="haskell"><span class="n" style="color: #333;">newStablePtrPrimMVar</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MVar</span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IO</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;">s0</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC629" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">makeStablePtr</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">unsafeCoerce</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PrimMVar</span><span class="p">)</span> <span class="n" style="color: #333;">s0</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC630" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Coerce unlifted m :: MVar# RealWorld ()</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4cd2c222e8f23d0ec73ca35694baa1cdc35e1c82...ff9eb1a2306a001236d606432e915ff5f27df39a#9cc5887db9e4af2e8d686d9953728d48fd50dd64"><strong>libraries/base/GHC/Stack/CloneStack.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 ForeignFunctionInterface #-}</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 TypeApplications #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" 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="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UnliftedFFITypes#-}</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Stack.CloneStack</span> <span class="p">(</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">cloneThreadStack</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">cloneMyStack</span><span class="p">,</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;">StackSnapshot</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="LC12" 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="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Prim</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StackSnapshot</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">cloneMyStack</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ThreadId</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Concurrent.MVar</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Conc.Sync</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Stable</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.IO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IO</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="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC20" 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="s" style="color: #d14;">"sendCloneStackMessage"</span> <span class="n" style="color: #333;">sendCloneStackMessage</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ThreadId</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;">StablePtr</span> <span class="kt" style="color: #458; font-weight: 600;">PrimMVar</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="LC21" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">StackSnapshot</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StackSnapshot</span> <span class="kt" style="color: #458; font-weight: 600;">StackSnapshot</span><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>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="cd">-- | Clone the stack of a thread identified by it's 'ThreadId'</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="n" style="color: #333;">cloneThreadStack</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ThreadId</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;">StackSnapshot</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="n" style="color: #333;">cloneThreadStack</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ThreadId</span> <span class="n" style="color: #333;">tid</span><span class="o" style="font-weight: 600;">#</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="LC27" class="line" lang="haskell"> <span class="n" style="color: #333;">resultVar</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newEmptyMVar</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">StackSnapshot</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"> <span class="n" style="color: #333;">ptr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newStablePtrPrimMVar</span> <span class="n" style="color: #333;">resultVar</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Use the RTS's "message" mechanism to request that</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the thread captures its stack, saving the result</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- into resultVar.</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"> <span class="n" style="color: #333;">sendCloneStackMessage</span> <span class="n" style="color: #333;">tid</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">ptr</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"> <span class="n" style="color: #333;">freeStablePtr</span> <span class="n" style="color: #333;">ptr</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="s" style="color: #d14;">"takeMVar"</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"> <span class="n" style="color: #333;">takeMVar</span> <span class="n" style="color: #333;">resultVar</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"><span class="cd">-- | Clone the stack of the executing thread</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="n" style="color: #333;">cloneMyStack</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;">StackSnapshot</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"><span class="n" style="color: #333;">cloneMyStack</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IO</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;">s</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">cloneMyStack</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span> <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="n" style="color: #333;">stack</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</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;">s1</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">StackSnapshot</span> <span class="n" style="color: #333;">stack</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/-/compare/4cd2c222e8f23d0ec73ca35694baa1cdc35e1c82...ff9eb1a2306a001236d606432e915ff5f27df39a#b7cfb47853ef95330e499ca0c5b90964744d101f"><strong>libraries/base/base.cabal</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">@@ -264,6 +264,7 @@ Library</td>
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<pre style="margin: 0;"> <span id="LC264" class="line" lang="plaintext"> GHC.ResponseFile</span>
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<pre style="margin: 0;"> <span id="LC265" class="line" lang="plaintext"> GHC.RTS.Flags</span>
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<pre style="margin: 0;"> <span id="LC266" class="line" lang="plaintext"> GHC.ST</span>
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<pre style="margin: 0;">+<span id="LC267" class="line" lang="plaintext"> GHC.Stack.CloneStack</span>
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<pre style="margin: 0;"> <span id="LC268" class="line" lang="plaintext"> GHC.StaticPtr</span>
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<pre style="margin: 0;"> <span id="LC269" class="line" lang="plaintext"> GHC.STRef</span>
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<pre style="margin: 0;"> <span id="LC270" class="line" lang="plaintext"> GHC.Show</span>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include <string.h></span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "Rts.h"</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "rts/Messages.h"</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "rts/storage/TSO.h"</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "stg/Types.h"</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "CloneStack.h"</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(THREADED_RTS)</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// ThreadId# in Haskell is a StgTSO* in RTS.</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">sendCloneStackMessage</span><span class="p">(</span><span class="n" style="color: #333;">StgTSO</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">tso</span><span class="p">,</span> <span class="n" style="color: #333;">HsStablePtr</span> <span class="n" style="color: #333;">mvar</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="c"> <span class="n" style="color: #333;">Capability</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">srcCapability</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rts_unsafeGetMyCapability</span><span class="p">();</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="c"> <span class="n" style="color: #333;">MessageCloneStack</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">msg</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="c"> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">MessageCloneStack</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">allocate</span><span class="p">(</span><span class="n" style="color: #333;">srcCapability</span><span class="p">,</span> <span class="n" style="color: #333;">sizeofW</span><span class="p">(</span><span class="n" style="color: #333;">MessageCloneStack</span><span class="p">));</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="c"> <span class="n" style="color: #333;">msg</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">tso</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tso</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="c"> <span class="n" style="color: #333;">msg</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">result</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">StgMVar</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">deRefStablePtr</span><span class="p">(</span><span class="n" style="color: #333;">mvar</span><span class="p">);</span></span>
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19
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// TODO: Free? See RtsAPI.c: hs_try_putmvar()</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="c"> <span class="n" style="color: #333;">SET_HDR</span><span class="p">(</span><span class="n" style="color: #333;">msg</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_MSG_CLONE_STACK_info</span><span class="p">,</span> <span class="n" style="color: #333;">CCS_SYSTEM</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Ensure that writes constructing Message are committed before sending.</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="c"> <span class="n" style="color: #333;">write_barrier</span><span class="p">();</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="c"> <span class="n" style="color: #333;">sendMessage</span><span class="p">(</span><span class="n" style="color: #333;">srcCapability</span><span class="p">,</span> <span class="n" style="color: #333;">tso</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">cap</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">Message</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">msg</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">handleCloneStackMessage</span><span class="p">(</span><span class="n" style="color: #333;">MessageCloneStack</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">msg</span><span class="p">){</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="c"> <span class="n" style="color: #333;">StgStack</span><span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">newStackClosure</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cloneStack</span><span class="p">(</span><span class="n" style="color: #333;">msg</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">tso</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">cap</span><span class="p">,</span> <span class="n" style="color: #333;">msg</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">tso</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">stackobj</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="c"> <span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">putMVarWasSuccessful</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">performTryPutMVar</span><span class="p">(</span><span class="n" style="color: #333;">msg</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">tso</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">cap</span><span class="p">,</span> <span class="n" style="color: #333;">msg</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">result</span><span class="p">,</span> <span class="n" style="color: #333;">newStackClosure</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span><span class="p">(</span><span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">putMVarWasSuccessful</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="c"> <span class="n" style="color: #333;">barf</span><span class="p">(</span><span class="s" style="color: #d14;">"Can't put stack cloning result into MVar."</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#else // !defined(THREADED_RTS)</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">sendCloneStackMessage</span><span class="p">(</span><span class="n" style="color: #333;">StgTSO</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">tso</span><span class="p">,</span> <span class="n" style="color: #333;">HsStablePtr</span> <span class="n" style="color: #333;">mvar</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="c"> <span class="n" style="color: #333;">barf</span><span class="p">(</span><span class="s" style="color: #d14;">"Sending CloneStackMessages is only available in threaded RTS!"</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif // end !defined(THREADED_RTS)</span></span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="c"><span class="n" style="color: #333;">StgStack</span><span class="o" style="font-weight: 600;">*</span> <span class="nf" style="color: #900; font-weight: 600;">cloneStack</span><span class="p">(</span><span class="n" style="color: #333;">Capability</span><span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">capability</span><span class="p">,</span> <span class="n" style="color: #333;">StgStack</span><span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">stack</span><span class="p">){</span></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(DEBUG)</span></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="c"> <span class="n" style="color: #333;">debugBelch</span><span class="p">(</span><span class="s" style="color: #d14;">"Stack to clone</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="c"> <span class="n" style="color: #333;">printStack</span><span class="p">(</span><span class="n" style="color: #333;">stack</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="c"> <span class="n" style="color: #333;">StgWord</span> <span class="n" style="color: #333;">spOffset</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">stack</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">sp</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">stack</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">stack</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="c"> <span class="n" style="color: #333;">StgWord</span> <span class="n" style="color: #333;">closureSizeBytes</span> <span class="o" style="font-weight: 600;">=</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">StgStack</span><span class="p">)</span> <span class="o" style="font-weight: 600;">+</span> <span class="p">(</span><span class="n" style="color: #333;">stack</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">stack_size</span> <span class="o" style="font-weight: 600;">*</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">StgWord</span><span class="p">));</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="c"> <span class="n" style="color: #333;">StgStack</span><span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">newStackClosure</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">StgStack</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">allocate</span><span class="p">(</span><span class="n" style="color: #333;">capability</span><span class="p">,</span> <span class="n" style="color: #333;">ROUNDUP_BYTES_TO_WDS</span><span class="p">(</span><span class="n" style="color: #333;">closureSizeBytes</span><span class="p">));</span></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="c"> <span class="n" style="color: #333;">memcpy</span><span class="p">(</span><span class="n" style="color: #333;">newStackClosure</span><span class="p">,</span> <span class="n" style="color: #333;">stack</span><span class="p">,</span> <span class="n" style="color: #333;">closureSizeBytes</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="c"> <span class="n" style="color: #333;">newStackClosure</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">sp</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">newStackClosure</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">stack</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">spOffset</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(DEBUG)</span></span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="c"> <span class="n" style="color: #333;">debugBelch</span><span class="p">(</span><span class="s" style="color: #d14;">"Cloned stack</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="c"> <span class="n" style="color: #333;">printStack</span><span class="p">(</span><span class="n" style="color: #333;">newStackClosure</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// TODO: Check sanity</span></span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">newStackClosure</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="c"><span class="p">}</span></span></pre>
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<li id="b0baad6a4b3ea9e8bb4438f46afb74f1ca6f5638">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4cd2c222e8f23d0ec73ca35694baa1cdc35e1c82...ff9eb1a2306a001236d606432e915ff5f27df39a#b0baad6a4b3ea9e8bb4438f46afb74f1ca6f5638"><strong>rts/CloneStack.h</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#pragma once</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(THREADED_RTS)</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">handleCloneStackMessage</span><span class="p">(</span><span class="n" style="color: #333;">MessageCloneStack</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">msg</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">sendCloneStackMessage</span><span class="p">(</span><span class="n" style="color: #333;">StgTSO</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">tso</span><span class="p">,</span> <span class="n" style="color: #333;">HsStablePtr</span> <span class="n" style="color: #333;">mvar</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="c"><span class="n" style="color: #333;">StgStack</span><span class="o" style="font-weight: 600;">*</span> <span class="nf" style="color: #900; font-weight: 600;">cloneStack</span><span class="p">(</span><span class="n" style="color: #333;">Capability</span><span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">capability</span><span class="p">,</span> <span class="n" style="color: #333;">StgStack</span><span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">stack</span><span class="p">);</span></span></pre>
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<li id="63bb2dcb45bf7982130b0b95ecf366bf1a617e82">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4cd2c222e8f23d0ec73ca35694baa1cdc35e1c82...ff9eb1a2306a001236d606432e915ff5f27df39a#63bb2dcb45bf7982130b0b95ecf366bf1a617e82"><strong>rts/Messages.c</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">@@ -14,6 +14,7 @@</td>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "Threads.h"</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "RaiseAsync.h"</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "sm/Storage.h"</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "CloneStack.h"</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* ----------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> Send a message to another Capability</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="32" 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>
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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">@@ -32,7 +33,8 @@ void sendMessage(Capability *from_cap, Capability *to_cap, Message *msg)</td>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="c"> <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="n" style="color: #333;">stg_MSG_BLACKHOLE_info</span> <span class="o" style="font-weight: 600;">&&</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="c"> <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="n" style="color: #333;">stg_MSG_TRY_WAKEUP_info</span> <span class="o" style="font-weight: 600;">&&</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="c"> <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="n" style="color: #333;">stg_IND_info</span> <span class="o" style="font-weight: 600;">&&</span> <span class="c1" style="color: #998; font-style: italic;">// can happen if a MSG_BLACKHOLE is revoked</span></span>
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<pre style="margin: 0;">-<span id="LC35" class="line" lang="c"> <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="n" style="color: #333;">stg_WHITEHOLE_info</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="c"> <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="n" style="color: #333;">stg_WHITEHOLE_info</span> <span class="o" style="font-weight: 600;">&&</span></span>
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<td class="diff-line-num new new_line" data-linenumber="37" 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="LC37" class="line" lang="c"> <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="n" style="color: #333;">stg_MSG_CLONE_STACK_info</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="c"> <span class="n" style="color: #333;">barf</span><span class="p">(</span><span class="s" style="color: #d14;">"sendMessage: %p"</span><span class="p">,</span> <span class="n" style="color: #333;">i</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="c"> <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">@@ -131,6 +133,10 @@ loop:</td>
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133
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="c"> <span class="k" style="font-weight: 600;">goto</span> <span class="n" style="color: #333;">loop</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="c"> <span class="k" style="font-weight: 600;">else</span> <span class="k" style="font-weight: 600;">if</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="n" style="color: #333;">stg_MSG_CLONE_STACK_info</span><span class="p">){</span></span>
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="c"> <span class="n" style="color: #333;">MessageCloneStack</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">cloneStackMessage</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">MessageCloneStack</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">m</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="c"> <span class="n" style="color: #333;">handleCloneStackMessage</span><span class="p">(</span><span class="n" style="color: #333;">cloneStackMessage</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="c"> <span class="k" style="font-weight: 600;">else</span></span>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="c"> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC142" class="line" lang="c"> <span class="n" style="color: #333;">barf</span><span class="p">(</span><span class="s" style="color: #d14;">"executeMessage: %p"</span><span class="p">,</span> <span class="n" style="color: #333;">i</span><span class="p">);</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4cd2c222e8f23d0ec73ca35694baa1cdc35e1c82...ff9eb1a2306a001236d606432e915ff5f27df39a#6db965f97cbab901f493506a385bcf1283009921"><strong>rts/PrimOps.cmm</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">@@ -2841,26 +2841,13 @@ stg_setThreadAllocationCounterzh ( I64 counter )</td>
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2841
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<pre style="margin: 0;"> <span id="LC2841" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">return</span> <span class="p">();</span></span>
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<pre style="margin: 0;"> <span id="LC2842" class="line" lang="ghc-cmm"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2843" class="line" lang="ghc-cmm"></span>
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<pre style="margin: 0;">-<span id="LC2844" class="line" lang="ghc-cmm"><span class="nf" style="color: #900; font-weight: 600;">stg_cloneThreadStackzh</span> <span class="p">()</span> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC2845" class="line" lang="ghc-cmm"> <span class="c1" style="color: #998; font-style: italic;">// TODO: Implement me! Consider locks, race-conditions, etc.</span></span>
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<pre style="margin: 0;">-<span id="LC2846" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">return</span> <span class="p">();</span></span>
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<pre style="margin: 0;">-<span id="LC2847" class="line" lang="ghc-cmm"><span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC2848" class="line" lang="ghc-cmm"></span>
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<pre style="margin: 0;"> <span id="LC2844" class="line" lang="ghc-cmm"><span class="nf" style="color: #900; font-weight: 600;">stg_cloneMyStackzh</span> <span class="p">()</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC2845" class="line" lang="ghc-cmm"> <span class="kt" style="color: #458; font-weight: 600;">W_</span> <span class="nl">stgStack</span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC2851" class="line" lang="ghc-cmm"> <span class="kt" style="color: #458; font-weight: 600;">gcptr</span> <span class="nl">p</span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC2852" class="line" lang="ghc-cmm"> <span class="kt" style="color: #458; font-weight: 600;">W_</span> <span class="nl">neededMemorySize</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC2846" class="line" lang="ghc-cmm"> <span class="kt" style="color: #458; font-weight: 600;">W_</span> <span class="nl">clonedStack</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC2847" class="line" lang="ghc-cmm"></span>
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<pre style="margin: 0;"> <span id="LC2848" class="line" lang="ghc-cmm"> <span class="nl">stgStack</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">StgTSO_stackobj</span><span class="p">(</span><span class="vg" style="color: #008080;">CurrentTSO</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC2849" class="line" lang="ghc-cmm"></span>
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<pre style="margin: 0;">-<span id="LC2856" class="line" lang="ghc-cmm"> <span class="nl">neededMemorySize</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">BYTES_TO_WDS</span><span class="p">(</span><span class="nl">SIZEOF_StgStack</span><span class="p">)</span> <span class="o" style="font-weight: 600;">+</span> <span class="nf" style="color: #900; font-weight: 600;">StgStack_stack_size</span><span class="p">(</span><span class="nl">stgStack</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC2857" class="line" lang="ghc-cmm"></span>
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<pre style="margin: 0;">-<span id="LC2858" class="line" lang="ghc-cmm"> <span class="p">(</span><span class="dl">"</span><span class="s" style="color: #d14;">ptr</span><span class="dl">"</span> <span class="nl">p</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="k" style="font-weight: 600;">ccall</span> <span class="nf" style="color: #900; font-weight: 600;">allocateMightFail</span><span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">MyCapability</span><span class="p">()</span> <span class="dl">"</span><span class="s" style="color: #d14;">ptr</span><span class="dl">"</span><span class="p">,</span> <span class="nl">neededMemorySize</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC2859" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="nl">p</span> <span class="o" style="font-weight: 600;">==</span> <span class="nl">NULL</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC2860" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">jump</span> <span class="nf" style="color: #900; font-weight: 600;">stg_raisezh</span><span class="p">(</span><span class="nl">base_GHCziIOziException_heapOverflow_closure</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC2861" class="line" lang="ghc-cmm"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2850" class="line" lang="ghc-cmm"> <span class="p">(</span><span class="dl">"</span><span class="s" style="color: #d14;">ptr</span><span class="dl">"</span> <span class="nl">clonedStack</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="k" style="font-weight: 600;">ccall</span> <span class="nf" style="color: #900; font-weight: 600;">cloneStack</span><span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">MyCapability</span><span class="p">()</span> <span class="dl">"</span><span class="s" style="color: #d14;">ptr</span><span class="dl">"</span><span class="p">,</span> <span class="nl">stgStack</span> <span class="dl">"</span><span class="s" style="color: #d14;">ptr</span><span class="dl">"</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC2851" class="line" lang="ghc-cmm"></span>
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<pre style="margin: 0;">-<span id="LC2863" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">prim</span> <span class="nb" style="color: #0086b3;">%memcpy</span><span class="p">(</span><span class="nl">p</span><span class="p">,</span> <span class="nl">stgStack</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">WDS</span><span class="p">(</span><span class="nl">neededMemorySize</span><span class="p">),</span> <span class="nl">SIZEOF_W</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC2864" class="line" lang="ghc-cmm"></span>
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<pre style="margin: 0;">-<span id="LC2865" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">return</span> <span class="p">(</span><span class="nl">p</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC2852" class="line" lang="ghc-cmm"> <span class="k" style="font-weight: 600;">return</span> <span class="p">(</span><span class="nl">clonedStack</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC2853" class="line" lang="ghc-cmm"><span class="p">}</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4cd2c222e8f23d0ec73ca35694baa1cdc35e1c82...ff9eb1a2306a001236d606432e915ff5f27df39a#1f366bc5cc9fea123d6a6ab6c25b1483994867d5"><strong>rts/Printer.c</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">@@ -642,7 +642,8 @@ printStackChunk( StgPtr sp, StgPtr spBottom )</td>
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<pre style="margin: 0;"> <span id="LC642" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC643" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC644" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC645" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">printStack</span><span class="p">(</span> <span class="n" style="color: #333;">StgStack</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">stack</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC645" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// TODO: Do not merge. Only exported for debugging.</span></span>
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<pre style="margin: 0;">+<span id="LC646" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">printStack</span><span class="p">(</span> <span class="n" style="color: #333;">StgStack</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">stack</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC647" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC648" class="line" lang="c"> <span class="n" style="color: #333;">printStackChunk</span><span class="p">(</span> <span class="n" style="color: #333;">stack</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">sp</span><span class="p">,</span> <span class="n" style="color: #333;">stack</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">stack</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">stack</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">stack_size</span> <span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC649" class="line" lang="c"><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">@@ -697,7 +698,7 @@ void printLargeAndPinnedObjects()</td>
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<pre style="margin: 0;"> <span id="LC698" class="line" lang="c"> <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333;">cap_idx</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span> <span class="n" style="color: #333;">cap_idx</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">n_capabilities</span><span class="p">;</span> <span class="o" style="font-weight: 600;">++</span><span class="n" style="color: #333;">cap_idx</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC699" class="line" lang="c"> <span class="n" style="color: #333;">Capability</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">cap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">capabilities</span><span class="p">[</span><span class="n" style="color: #333;">cap_idx</span><span class="p">];</span></span>
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<pre style="margin: 0;"> <span id="LC700" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC700" class="line" lang="c"> <span class="n" style="color: #333;">debugBelch</span><span class="p">(</span><span class="s" style="color: #d14;">"Capability %d: Current pinned object block: %p</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">,</span><span class="idiff left right"> </span></span>
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<pre style="margin: 0;">+<span id="LC701" class="line" lang="c"> <span class="n" style="color: #333;">debugBelch</span><span class="p">(</span><span class="s" style="color: #d14;">"Capability %d: Current pinned object block: %p</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC702" class="line" lang="c"> <span class="n" style="color: #333;">cap_idx</span><span class="p">,</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">cap</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">pinned_object_block</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC703" class="line" lang="c"> <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="n" style="color: #333;">bdescr</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">bd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cap</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">pinned_object_blocks</span><span class="p">;</span> <span class="n" style="color: #333;">bd</span><span class="p">;</span> <span class="n" style="color: #333;">bd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bd</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">link</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC704" class="line" lang="c"> <span class="n" style="color: #333;">debugBelch</span><span class="p">(</span><span class="s" style="color: #d14;">"%p</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">,</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">bd</span><span class="p">);</span></span>
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<li id="084edb42735a765a977db3713b293347089e6c3b">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4cd2c222e8f23d0ec73ca35694baa1cdc35e1c82...ff9eb1a2306a001236d606432e915ff5f27df39a#084edb42735a765a977db3713b293347089e6c3b"><strong>rts/Printer.h</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">@@ -21,6 +21,7 @@ const char * info_type_by_ip ( const StgInfoTable *ip );</td>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="c"><span class="k" style="font-weight: 600;">const</span> <span class="kt" style="color: #458; font-weight: 600;">char</span> <span class="o" style="font-weight: 600;">*</span> <span class="nf" style="color: #900; font-weight: 600;">info_update_frame</span> <span class="p">(</span> <span class="k" style="font-weight: 600;">const</span> <span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">closure</span> <span class="p">);</span></span>
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22
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(DEBUG)</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="c"><span class="k" style="font-weight: 600;">extern</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">printStack</span><span class="p">(</span> <span class="n" style="color: #333;">StgStack</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">stack</span> <span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="c"><span class="k" style="font-weight: 600;">extern</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">printClosure</span> <span class="p">(</span> <span class="k" style="font-weight: 600;">const</span> <span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">obj</span> <span class="p">);</span></span>
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26
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="c"><span class="k" style="font-weight: 600;">extern</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">printStackChunk</span> <span class="p">(</span> <span class="n" style="color: #333;">StgPtr</span> <span class="n" style="color: #333;">sp</span><span class="p">,</span> <span class="n" style="color: #333;">StgPtr</span> <span class="n" style="color: #333;">spLim</span> <span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="c"><span class="k" style="font-weight: 600;">extern</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">printTSO</span> <span class="p">(</span> <span class="n" style="color: #333;">StgTSO</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">tso</span> <span class="p">);</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4cd2c222e8f23d0ec73ca35694baa1cdc35e1c82...ff9eb1a2306a001236d606432e915ff5f27df39a#6ca006a5d6dfdfdb97d0dd72db322e3f6eaa6214"><strong>rts/StgMiscClosures.cmm</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">@@ -573,6 +573,9 @@ INFO_TABLE_CONSTR(stg_MSG_BLACKHOLE,3,0,0,PRIM,"MSG_BLACKHOLE","MSG_BLACKHOLE")</td>
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573
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573
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<pre style="margin: 0;"> <span id="LC573" class="line" lang="ghc-cmm"><span class="nb" style="color: #0086b3;">INFO_TABLE_CONSTR</span><span class="p">(</span><span class="nl">stg_MSG_NULL</span><span class="p">,</span><span class="mi" style="color: #099;">1</span><span class="p">,</span><span class="mi" style="color: #099;">0</span><span class="p">,</span><span class="mi" style="color: #099;">0</span><span class="p">,</span><span class="nl">PRIM</span><span class="p">,</span><span class="dl">"</span><span class="s" style="color: #d14;">MSG_NULL</span><span class="dl">"</span><span class="p">,</span><span class="dl">"</span><span class="s" style="color: #d14;">MSG_NULL</span><span class="dl">"</span><span class="p">)</span></span>
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574
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574
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<pre style="margin: 0;"> <span id="LC574" class="line" lang="ghc-cmm"><span class="p">{</span> <span class="k" style="font-weight: 600;">foreign</span> <span class="dl">"</span><span class="s" style="color: #d14;">C</span><span class="dl">"</span> <span class="nf" style="color: #900; font-weight: 600;">barf</span><span class="p">(</span><span class="dl">"</span><span class="s" style="color: #d14;">MSG_NULL object (</span><span class="ss" style="color: #990073;">%p</span><span class="s" style="color: #d14;">) entered!</span><span class="dl">"</span><span class="p">,</span> <span class="vg" style="color: #008080;">R1</span><span class="p">)</span> <span class="k" style="font-weight: 600;">never</span> <span class="k" style="font-weight: 600;">returns</span><span class="p">;</span> <span class="p">}</span></span>
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575
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575
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<pre style="margin: 0;"> <span id="LC575" class="line" lang="ghc-cmm"></span>
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576
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<pre style="margin: 0;">+<span id="LC576" class="line" lang="ghc-cmm"><span class="nb" style="color: #0086b3;">INFO_TABLE_CONSTR</span><span class="p">(</span><span class="nl">stg_MSG_CLONE_STACK</span><span class="p">,</span><span class="mi" style="color: #099;">3</span><span class="p">,</span><span class="mi" style="color: #099;">0</span><span class="p">,</span><span class="mi" style="color: #099;">0</span><span class="p">,</span><span class="nl">PRIM</span><span class="p">,</span><span class="dl">"</span><span class="s" style="color: #d14;">MSG_CLONE_STACK</span><span class="dl">"</span><span class="p">,</span><span class="dl">"</span><span class="s" style="color: #d14;">MSG_CLONE_STACK</span><span class="dl">"</span><span class="p">)</span></span>
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577
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<pre style="margin: 0;">+<span id="LC577" class="line" lang="ghc-cmm"><span class="p">{</span> <span class="k" style="font-weight: 600;">foreign</span> <span class="dl">"</span><span class="s" style="color: #d14;">C</span><span class="dl">"</span> <span class="nf" style="color: #900; font-weight: 600;">barf</span><span class="p">(</span><span class="dl">"</span><span class="s" style="color: #d14;">stg_MSG_CLONE_STACK object (</span><span class="ss" style="color: #990073;">%p</span><span class="s" style="color: #d14;">) entered!</span><span class="dl">"</span><span class="p">,</span> <span class="vg" style="color: #008080;">R1</span><span class="p">)</span> <span class="k" style="font-weight: 600;">never</span> <span class="k" style="font-weight: 600;">returns</span><span class="p">;</span> <span class="p">}</span></span>
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578
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<pre style="margin: 0;">+<span id="LC578" class="line" lang="ghc-cmm"></span>
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576
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579
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<pre style="margin: 0;"> <span id="LC579" class="line" lang="ghc-cmm"><span class="cm" style="color: #998; font-style: italic;">/* ----------------------------------------------------------------------------</span></span>
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577
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580
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<pre style="margin: 0;"> <span id="LC580" class="line" lang="ghc-cmm"><span class="cm" style="color: #998; font-style: italic;"> END_TSO_QUEUE</span></span>
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581
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<pre style="margin: 0;"> <span id="LC581" class="line" lang="ghc-cmm"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4cd2c222e8f23d0ec73ca35694baa1cdc35e1c82...ff9eb1a2306a001236d606432e915ff5f27df39a#a5d219117032120cc7bde9f13451d9627cff5614"><strong>rts/Threads.c</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">@@ -23,6 +23,7 @@</td>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "Printer.h"</span></span>
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24
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "sm/Sanity.h"</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "sm/Storage.h"</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "Printer.h"</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include <string.h></span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="c"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4cd2c222e8f23d0ec73ca35694baa1cdc35e1c82...ff9eb1a2306a001236d606432e915ff5f27df39a#e432c7b248b68100c3cc37db36ee80d975efd697"><strong>rts/rts.cabal.in</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">@@ -410,6 +410,7 @@ library</td>
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<pre style="margin: 0;"> <span id="LC410" class="line" lang="plaintext"> Arena.c</span>
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<pre style="margin: 0;"> <span id="LC411" class="line" lang="plaintext"> Capability.c</span>
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="plaintext"> CheckUnload.c</span>
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<pre style="margin: 0;">+<span id="LC413" class="line" lang="plaintext"> CloneStack.c</span>
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<pre style="margin: 0;"> <span id="LC414" class="line" lang="plaintext"> ClosureFlags.c</span>
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<pre style="margin: 0;"> <span id="LC415" class="line" lang="plaintext"> Disassembler.c</span>
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<pre style="margin: 0;"> <span id="LC416" class="line" lang="plaintext"> FileLock.c</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4cd2c222e8f23d0ec73ca35694baa1cdc35e1c82...ff9eb1a2306a001236d606432e915ff5f27df39a#5ced844c5529162410276a1236ca9b8e7186490c"><strong>testsuite/tests/rts/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">@@ -418,3 +418,7 @@ test('T17088',</td>
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<pre style="margin: 0;"> <span id="LC418" class="line" lang="perl"> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-rtsopts -O2</span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC419" class="line" lang="perl"></span>
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<pre style="margin: 0;"> <span id="LC420" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T15427</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="LC421" class="line" lang="perl"></span>
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<pre style="margin: 0;">+<span id="LC422" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">cloneMyStack</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">extra_files</span><span class="p">(['</span><span class="s1" style="color: #d14;">cloneStackLib.c</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;">cloneStackLib.c -debug</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC423" class="line" lang="perl"></span>
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<pre style="margin: 0;">+<span id="LC424" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">cloneThreadStack</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">threaded1</span><span class="p">']),</span> <span class="nv" style="color: #008080;">extra_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">threaded1</span><span class="p">']),</span> <span class="nv" style="color: #008080;">extra_files</span><span class="p">(['</span><span class="s1" style="color: #d14;">cloneStackLib.c</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;">cloneStackLib.c -debug -threaded</span><span class="p">'])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4cd2c222e8f23d0ec73ca35694baa1cdc35e1c82...ff9eb1a2306a001236d606432e915ff5f27df39a#67df7943ba73891a07f3727afc5a3069c29051ac"><strong>testsuite/tests/rts/cloneMyStack.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 ForeignFunctionInterface #-}</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 UnliftedFFITypes #-}</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.Prim</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StackSnapshot</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Stack.CloneStack</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" 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="s" style="color: #d14;">"printy"</span> <span class="n" style="color: #333;">printStack</span><span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">StackSnapshot</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;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC10" 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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11
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<pre style="margin: 0;">+<span id="LC11" 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="LC12" class="line" lang="haskell"> <span class="n" style="color: #333;">stackSnapshot</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">cloneMyStack</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StackSnapshot</span> <span class="n" style="color: #333;">stack</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">stackSnapshot</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="n" style="color: #333;">printStack</span> <span class="n" style="color: #333;">stack</span></span></pre>
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<li id="da2af4490eb0e17c0307765ca5e1be1ca9b978ee">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4cd2c222e8f23d0ec73ca35694baa1cdc35e1c82...ff9eb1a2306a001236d606432e915ff5f27df39a#da2af4490eb0e17c0307765ca5e1be1ca9b978ee"><strong>testsuite/tests/rts/cloneStackLib.c</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "Rts.h"</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "RtsAPI.h"</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// TODO: Do not merge. Only exported for debugging.</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="c"><span class="k" style="font-weight: 600;">extern</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">printStack</span><span class="p">(</span> <span class="n" style="color: #333;">StgStack</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">stack</span> <span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">printy</span><span class="p">(</span><span class="n" style="color: #333;">StgStack</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">stack</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="c"> <span class="n" style="color: #333;">printStack</span><span class="p">(</span><span class="n" style="color: #333;">stack</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="c"><span class="p">}</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/4cd2c222e8f23d0ec73ca35694baa1cdc35e1c82...ff9eb1a2306a001236d606432e915ff5f27df39a#60f10ee48feb16d809a4eccfe717c69d79799369"><strong>testsuite/tests/rts/cloneThreadStack.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 ForeignFunctionInterface #-}</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 UnliftedFFITypes #-}</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.Prim</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StackSnapshot</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Stack.CloneStack</span></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;">Control.Concurrent</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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9
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<pre style="margin: 0;">+<span id="LC9" 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="s" style="color: #d14;">"printy"</span> <span class="n" style="color: #333;">printStack</span><span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">StackSnapshot</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;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" 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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12
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<pre style="margin: 0;">+<span id="LC12" 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="LC13" class="line" lang="haskell"> <span class="n" style="color: #333;">mVarToBeBlockedOn</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newEmptyMVar</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="n" style="color: #333;">threadId</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">forkIO</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">immediatelyBlocking</span> <span class="n" style="color: #333;">mVarToBeBlockedOn</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="n" style="color: #333;">stackSnapshot</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">cloneThreadStack</span> <span class="n" style="color: #333;">threadId</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StackSnapshot</span> <span class="n" style="color: #333;">stack</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">stackSnapshot</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="n" style="color: #333;">printStack</span> <span class="n" style="color: #333;">stack</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="n" style="color: #333;">immediatelyBlocking</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">MVar</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;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="n" style="color: #333;">immediatelyBlocking</span> <span class="n" style="color: #333;">mVarToBeBlockedOn</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="LC22" class="line" lang="haskell"> <span class="n" style="color: #333;">takeMVar</span> <span class="n" style="color: #333;">mVarToBeBlockedOn</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span></pre>
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