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<h3>
Matthew Pickering pushed to branch wip/t19038
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/060a96a0d93e47b34f8f919ade0479f649a028bb">060a96a0</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-12-09T08:08:39+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-heap: Allow more control about decoding CCS fields
We have to be careful not to decode too much, too eagerly, as in
ghc-debug this will lead to references to memory locations outside of
the currently copied closure.
Fixes #19038
</pre>
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<h4>5 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#06b370ff84e63d5f9d23a0e79846fa802f93dc44">
libraries/ghc-heap/GHC/Exts/Heap.hs
</a>
</li>
<li class="file-stats">
<a href="#537c5016bbeab19a69604ff2c514165ed3d90e05">
libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingDisabled.hsc
</a>
</li>
<li class="file-stats">
<a href="#98411644869d99f22dc10668d48fc5d6692e4dd8">
libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingEnabled.hsc
</a>
</li>
<li class="file-stats">
<a href="#f8c89d5221aedc242eebbc2c764f8e5234c112cc">
libraries/ghc-heap/GHC/Exts/Heap/ProfInfo/PeekProfInfo_ProfilingDisabled.hsc
</a>
</li>
<li class="file-stats">
<a href="#47c79b2e9cd3039de871866acd290eb3582b2804">
libraries/ghc-heap/GHC/Exts/Heap/ProfInfo/PeekProfInfo_ProfilingEnabled.hsc
</a>
</li>
</ul>
<h4>Changes:</h4>
<li id="06b370ff84e63d5f9d23a0e79846fa802f93dc44">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/060a96a0d93e47b34f8f919ade0479f649a028bb#06b370ff84e63d5f9d23a0e79846fa802f93dc44"><strong>libraries/ghc-heap/GHC/Exts/Heap.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">@@ -71,6 +71,7 @@ import GHC.Exts.Heap.InfoTable</td>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">endif</span></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts.Heap.Utils</span></span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">GHC.Exts.Heap.FFIClosures</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">FFIClosures</span></span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">GHC.Exts.Heap.ProfInfo.PeekProfInfo</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">PPI</span></span>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Bits</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="170" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="171" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -170,13 +171,19 @@ getClosureDataFromHeapObject x = do</td>
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"><span class="n" style="color: #333;">getClosureDataFromHeapRep</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ByteArray</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;">Ptr</span> <span class="kt" style="color: #458; font-weight: 600;">StgInfoTable</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">b</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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GenClosure</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"><span class="n" style="color: #333;">getClosureDataFromHeapRep</span> <span class="n" style="color: #333;">heapRep</span> <span class="n" style="color: #333;">infoTablePtr</span> <span class="n" style="color: #333;">pts</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="LC173" class="line" lang="haskell"> <span class="n" style="color: #333;">itbl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">peekItbl</span> <span class="n" style="color: #333;">infoTablePtr</span></span>
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<pre style="margin: 0;">-<span id="LC173" class="line" lang="haskell"> <span class="n" style="color: #333;">getClosureDataFromHeapRepPrim</span> <span class="p">(</span><span class="n" style="color: #333;">dataConNames</span> <span class="n" style="color: #333;">infoTablePtr</span><span class="p">)</span> <span class="n" style="color: #333;">itbl</span> <span class="n" style="color: #333;">heapRep</span> <span class="n" style="color: #333;">pts</span></span>
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"> <span class="n" style="color: #333;">getClosureDataFromHeapRepPrim</span> <span class="p">(</span><span class="n" style="color: #333;">dataConNames</span> <span class="n" style="color: #333;">infoTablePtr</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">PPI</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="n" style="color: #333;"><span class="idiff">peekTopCCS</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">itbl</span> <span class="n" style="color: #333;">heapRep</span> <span class="n" style="color: #333;">pts</span></span>
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="haskell"><span class="n" style="color: #333;">getClosureDataFromHeapRepPrim</span></span>
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="haskell"> <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;">String</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">String</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">String</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A continuation used to decode the constructor description field,</span></span>
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<pre style="margin: 0;"> <span id="LC179" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in ghc-debug this code can lead to segfaults because dataConNames</span></span>
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180
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<pre style="margin: 0;"> <span id="LC180" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- will dereference a random part of memory.</span></span>
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181
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">CostCentreStack</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A continuation which is used to decode a cost centre stack</span></span>
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183
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- In ghc-debug, this code will need to call back into the debuggee to</span></span>
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184
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- fetch the representation of the CCS before decoding it. Using</span></span>
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185
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<pre style="margin: 0;">+<span id="LC185" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- `peekTopCCS` for this argument can lead to segfaults in ghc-debug as</span></span>
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186
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<pre style="margin: 0;">+<span id="LC186" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the CCS argument will point outside the copied closure.</span></span>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StgInfoTable</span></span>
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The `StgInfoTable` of the closure, extracted from the heap</span></span>
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- representation.</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">@@ -191,7 +198,7 @@ getClosureDataFromHeapRepPrim</td>
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- `b` is some representation of a pointer e.g. `Any` or `Ptr Any`.</span></span>
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="haskell"> <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;">GenClosure</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC200" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Heap representation of the closure.</span></span>
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<pre style="margin: 0;">-<span id="LC194" class="line" lang="haskell"><span class="n" style="color: #333;">getClosureDataFromHeapRepPrim</span> <span class="n" style="color: #333;">getConDesc</span> <span class="n" style="color: #333;">itbl</span> <span class="n" style="color: #333;">heapRep</span> <span class="n" style="color: #333;">pts</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="LC201" class="line" lang="haskell"><span class="n" style="color: #333;">getClosureDataFromHeapRepPrim</span> <span class="n" style="color: #333;">getConDesc</span> <span class="n" style="color: #333;"><span class="idiff left">decodeCCS</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">itbl</span> <span class="n" style="color: #333;">heapRep</span> <span class="n" style="color: #333;">pts</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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195
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<pre style="margin: 0;"> <span id="LC202" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="c1" style="color: #998; font-style: italic;">-- heapRep as a list of words.</span></span>
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="haskell"> <span class="n" style="color: #333;">rawHeapWords</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Word</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="haskell"> <span class="n" style="color: #333;">rawHeapWords</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">W</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">indexWordArray</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">heapRep</span> <span class="n" style="color: #333;">i</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;"><-</span> <span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">..</span> <span class="n" style="color: #333;">end</span><span class="p">]</span> <span class="p">]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -343,7 +350,7 @@ getClosureDataFromHeapRepPrim getConDesc itbl heapRep pts = do</td>
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<pre style="margin: 0;"> <span id="LC350" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC351" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TSO</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">[</span> <span class="n" style="color: #333;">u_lnk</span><span class="p">,</span> <span class="n" style="color: #333;">u_gbl_lnk</span><span class="p">,</span> <span class="n" style="color: #333;">tso_stack</span><span class="p">,</span> <span class="n" style="color: #333;">u_trec</span><span class="p">,</span> <span class="n" style="color: #333;">u_blk_ex</span><span class="p">,</span> <span class="n" style="color: #333;">u_bq</span><span class="p">]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pts</span></span>
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<pre style="margin: 0;"> <span id="LC352" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">withArray</span> <span class="n" style="color: #333;">rawHeapWords</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">ptr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC346" class="line" lang="haskell"> <span class="n" style="color: #333;">fields</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">FFIClosures</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">peekTSOFields</span> <span class="n" style="color: #333;">ptr</span></span>
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<pre style="margin: 0;">+<span id="LC353" class="line" lang="haskell"> <span class="n" style="color: #333;">fields</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">FFIClosures</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">peekTSOFields</span> <span class="n" style="color: #333;"><span class="idiff left">decodeCCS</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">ptr</span></span>
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347
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<pre style="margin: 0;"> <span id="LC354" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">TSOClosure</span></span>
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<pre style="margin: 0;"> <span id="LC355" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">itbl</span></span>
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<pre style="margin: 0;"> <span id="LC356" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">link</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">u_lnk</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/060a96a0d93e47b34f8f919ade0479f649a028bb#537c5016bbeab19a69604ff2c514165ed3d90e05"><strong>libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingDisabled.hsc</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">@@ -30,8 +30,8 @@ data TSOFields = TSOFields {</td>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext">}</span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="plaintext">-- | Get non-pointer fields from @StgTSO_@ (@TSO.h@)</span>
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<pre style="margin: 0;">-<span id="LC33" class="line" lang="plaintext">peekTSOFields :: Ptr tsoPtr -> IO TSOFields</span>
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<pre style="margin: 0;">-<span id="LC34" class="line" lang="plaintext">peekTSOFields ptr = do</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext">peekTSOFields :: <span class="idiff left right">(Ptr a -> IO (Maybe CostCentreStack)) -> </span>Ptr tsoPtr -> IO TSOFields</span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext">peekTSOFields <span class="idiff left right">decodeCCS </span>ptr = do</span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="plaintext"> what_next' <- (#peek struct StgTSO_, what_next) ptr</span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="plaintext"> why_blocked' <- (#peek struct StgTSO_, why_blocked) ptr</span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="plaintext"> flags' <- (#peek struct StgTSO_, flags) ptr</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">@@ -40,7 +40,7 @@ peekTSOFields ptr = do</td>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="plaintext"> dirty' <- (#peek struct StgTSO_, dirty) ptr</span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext"> alloc_limit' <- (#peek struct StgTSO_, alloc_limit) ptr</span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="plaintext"> tot_stack_size' <- (#peek struct StgTSO_, tot_stack_size) ptr</span>
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<pre style="margin: 0;">-<span id="LC43" class="line" lang="plaintext"> tso_prof' <- peekStgTSOProfInfo ptr</span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="plaintext"> tso_prof' <- peekStgTSOProfInfo <span class="idiff left right">decodeCCS </span>ptr</span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext"> return TSOFields {</span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext"> tso_what_next = parseWhatNext what_next',</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/060a96a0d93e47b34f8f919ade0479f649a028bb#98411644869d99f22dc10668d48fc5d6692e4dd8"><strong>libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingEnabled.hsc</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">@@ -30,8 +30,8 @@ data TSOFields = TSOFields {</td>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext">}</span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="plaintext">-- | Get non-pointer fields from @StgTSO_@ (@TSO.h@)</span>
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<pre style="margin: 0;">-<span id="LC33" class="line" lang="plaintext">peekTSOFields :: Ptr tsoPtr -> IO TSOFields</span>
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<pre style="margin: 0;">-<span id="LC34" class="line" lang="plaintext">peekTSOFields ptr = do</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext">peekTSOFields :: <span class="idiff left right">(Ptr a -> IO (Maybe CostCentreStack)) -> </span>Ptr tsoPtr -> IO TSOFields</span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext">peekTSOFields <span class="idiff left right">decodeCCS </span>ptr = do</span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="plaintext"> what_next' <- (#peek struct StgTSO_, what_next) ptr</span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="plaintext"> why_blocked' <- (#peek struct StgTSO_, why_blocked) ptr</span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="plaintext"> flags' <- (#peek struct StgTSO_, flags) ptr</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">@@ -40,7 +40,7 @@ peekTSOFields ptr = do</td>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="plaintext"> dirty' <- (#peek struct StgTSO_, dirty) ptr</span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext"> alloc_limit' <- (#peek struct StgTSO_, alloc_limit) ptr</span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="plaintext"> tot_stack_size' <- (#peek struct StgTSO_, tot_stack_size) ptr</span>
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<pre style="margin: 0;">-<span id="LC43" class="line" lang="plaintext"> tso_prof' <- peekStgTSOProfInfo ptr</span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="plaintext"> tso_prof' <- peekStgTSOProfInfo <span class="idiff left right">decodeCCS </span>ptr</span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext"> return TSOFields {</span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext"> tso_what_next = parseWhatNext what_next',</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/060a96a0d93e47b34f8f919ade0479f649a028bb#f8c89d5221aedc242eebbc2c764f8e5234c112cc"><strong>libraries/ghc-heap/GHC/Exts/Heap/ProfInfo/PeekProfInfo_ProfilingDisabled.hsc</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext">module GHC.Exts.Heap.ProfInfo.PeekProfInfo_ProfilingDisabled(</span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext"> peekStgTSOProfInfo</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> , peekTopCCS</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext">) where</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext">import Prelude</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">@@ -8,5 +9,8 @@ import GHC.Exts.Heap.ProfInfo.Types</td>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext">-- | This implementation is used when PROFILING is undefined.</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext">-- It always returns 'Nothing', because there is no profiling info available.</span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext">peekStgTSOProfInfo :: Ptr tsoPtr -> IO (Maybe StgTSOProfInfo)</span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext">peekStgTSOProfInfo _ = return Nothing</span></pre>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext">peekStgTSOProfInfo :: (Ptr a -> IO (Maybe CostCentreStack)) -> Ptr tsoPtr -> IO (Maybe StgTSOProfInfo)</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext">peekStgTSOProfInfo _ _ = return Nothing</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext">peekTopCCS :: Ptr a -> IO (Maybe CostCentreStack)</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext">peekTopCCS _ = return Nothing</span></pre>
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<li id="47c79b2e9cd3039de871866acd290eb3582b2804">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/060a96a0d93e47b34f8f919ade0479f649a028bb#47c79b2e9cd3039de871866acd290eb3582b2804"><strong>libraries/ghc-heap/GHC/Exts/Heap/ProfInfo/PeekProfInfo_ProfilingEnabled.hsc</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">@@ -3,6 +3,7 @@</td>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext">module GHC.Exts.Heap.ProfInfo.PeekProfInfo_ProfilingEnabled(</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> peekStgTSOProfInfo</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> , peekTopCCS</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext">) where</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext">#if __GLASGOW_HASKELL__ >= 811</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">@@ -33,16 +34,20 @@ import Prelude</td>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="plaintext">type AddressSet = IntSet</span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="plaintext">type AddressMap = IntMap</span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC36" class="line" lang="plaintext">peekStgTSOProfInfo :: Ptr a -> IO (Maybe StgTSOProfInfo)</span>
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<pre style="margin: 0;">-<span id="LC37" class="line" lang="plaintext">peekStgTSOProfInfo tsoPtr = do</span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="plaintext">peekStgTSOProfInfo :: <span class="idiff left right">(Ptr b -> IO (Maybe CostCentreStack)) -> </span>Ptr a -> IO (Maybe StgTSOProfInfo)</span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="plaintext">peekStgTSOProfInfo <span class="idiff left right">decodeCCS </span>tsoPtr = do</span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="plaintext"> cccs_ptr <- peekByteOff tsoPtr cccsOffset</span>
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<pre style="margin: 0;">-<span id="LC39" class="line" lang="plaintext"> costCenterCacheRef <- newIORef IntMap.empty</span>
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<pre style="margin: 0;">-<span id="LC40" class="line" lang="plaintext"> cccs' <- peekCostCentreStack IntSet.empty costCenterCacheRef cccs_ptr</span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="plaintext"> cccs' <- decodeCCS cccs_ptr</span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="plaintext"> return $ Just StgTSOProfInfo {</span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="plaintext"> cccs = cccs'</span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="plaintext"> }</span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="plaintext">peekTopCCS :: Ptr b -> IO (Maybe CostCentreStack)</span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="plaintext">peekTopCCS cccs_ptr = do</span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext"> costCenterCacheRef <- newIORef IntMap.empty</span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="plaintext"> peekCostCentreStack IntSet.empty costCenterCacheRef cccs_ptr</span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="plaintext">cccsOffset :: Int</span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="plaintext">cccsOffset = (#const OFFSET_StgTSO_cccs) + (#size StgHeader)</span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="plaintext"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -162,4 +167,7 @@ import GHC.Exts.Heap.ProfInfo.Types</td>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="plaintext">peekStgTSOProfInfo :: Ptr a -> IO (Maybe StgTSOProfInfo)</span>
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="plaintext">peekStgTSOProfInfo _ = return Nothing</span>
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170
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="plaintext"></span>
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171
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="plaintext">peekTopCCS :: Ptr a -> IO (Maybe CostCentreStack)</span>
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172
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="plaintext">peekTopCCS _ = return Nothing</span>
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165
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173
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="plaintext">#endif</span></pre>
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