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<h3>
Matthew Pickering pushed to branch wip/heap-rep-decode-tweaks
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/778af89a9809edac4dcf5fb8cf174192d82f6b47">778af89a</a></strong>
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<span>by Matthew Pickering</span>
<i>at 2020-11-24T15:57:14+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove special case for GHC.ByteCode.Instr
This was added in
https://github.com/nomeata/ghc-heap-view/commit/34935206e51b9c86902481d84d2f368a6fd93423
GHC.ByteCode.Instr.BreakInfo no longer exists so the special case is dead code.
Any check like this can be easily dealt with in client code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4b844a5c89889fb4f3f21825f50d6281519c84ea">4b844a5c</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-11-24T15:58:23+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Split Up getClosureDataFromHeapRep
Motivation
1. Don't enforce the repeated decoding of an info table, when the client
can cache it (ghc-debug)
2. Allow the constructor information decoding to be overridden, this
casues segfaults in ghc-debug
</pre>
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<h4>1 changed file:</h4>
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<a href="#06b370ff84e63d5f9d23a0e79846fa802f93dc44">
libraries/ghc-heap/GHC/Exts/Heap.hs
</a>
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<h4>Changes:</h4>
<li id="06b370ff84e63d5f9d23a0e79846fa802f93dc44">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/51e3ecc54142ea04965bf7e2b66622eb118f7ab6...4b844a5c89889fb4f3f21825f50d6281519c84ea#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">@@ -29,6 +29,7 @@ module GHC.Exts.Heap (</td>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">PrimType</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">HasHeapRep</span><span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">getClosureData</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">getClosureDataFromHeapRep</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">getClosureDataFromHeapRepPrim</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Info Table types</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">StgInfoTable</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="153" 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">@@ -152,26 +153,34 @@ getClosureDataFromHeapObject x = do</td>
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">STACK</span> <span class="o" style="font-weight: 600;">-></span> <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;">UnsupportedClosure</span> <span class="n" style="color: #333;">infoTable</span></span>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">getClosureDataFromHeapRep</span> <span class="n" style="color: #333;">heapRep</span> <span class="n" style="color: #333;">infoTablePtr</span> <span class="n" style="color: #333;">ptrList</span></span>
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<pre style="margin: 0;"> <span id="LC155" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="haskell"><span class="cd">-- | Convert an unpacked heap object, to a `GenClosure b`. The inputs to this</span></span>
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- function can be generated from a heap object using `unpackClosure#`.</span></span>
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<pre style="margin: 0;">-<span id="LC157" class="line" lang="haskell"><span class="n" style="color: #333;">getClosureDataFromHeapRep</span></span>
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<pre style="margin: 0;">-<span id="LC158" class="line" lang="haskell"> <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>
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<pre style="margin: 0;">+<span id="LC159" 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="LC160" 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="LC161" 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="LC162" 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="LC163" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"><span class="n" style="color: #333;">getClosureDataFromHeapRepPrim</span></span>
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<pre style="margin: 0;">+<span id="LC165" 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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166
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A continuation used to decode the constructor description field,</span></span>
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167
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in ghc-debug this code can lead to segfaults because dataConNames</span></span>
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168
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- will dereference a random part of memory.</span></span>
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169
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<pre style="margin: 0;">+<span id="LC169" 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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170
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The `StgInfoTable` of the closure, extracted from the heap</span></span>
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171
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- representation.</span></span>
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172
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"> <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>
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159
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Heap representation of the closure as returned by `unpackClosure#`.</span></span>
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160
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174
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This includes all of the object including the header, info table</span></span>
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161
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175
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pointer, pointer data, and non-pointer data. The ByteArray# may be</span></span>
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162
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176
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pinned or unpinned.</span></span>
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163
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<pre style="margin: 0;">-<span id="LC163" class="line" lang="haskell"> <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>
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164
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<pre style="margin: 0;">-<span id="LC164" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Pointer to the `StgInfoTable` of the closure, extracted from the heap</span></span>
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165
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<pre style="margin: 0;">-<span id="LC165" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- representation. The info table must not be movable by GC i.e. must be in</span></span>
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166
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<pre style="margin: 0;">-<span id="LC166" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pinned or off-heap memory.</span></span>
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167
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177
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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="p">[</span><span class="n" style="color: #333;">b</span><span class="p">]</span></span>
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168
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178
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Pointers in the payload of the closure, extracted from the heap</span></span>
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169
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179
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<pre style="margin: 0;"> <span id="LC179" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- representation as returned by `collect_pointers()` in `Heap.c`. The type</span></span>
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170
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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;">-- `b` is some representation of a pointer e.g. `Any` or `Ptr Any`.</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="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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172
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182
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<pre style="margin: 0;"> <span id="LC182" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Heap representation of the closure.</span></span>
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<pre style="margin: 0;">-<span id="LC173" 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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174
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<pre style="margin: 0;">-<span id="LC174" 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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183
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<pre style="margin: 0;">+<span id="LC183" 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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175
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184
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<pre style="margin: 0;"> <span id="LC184" 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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176
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185
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<pre style="margin: 0;"> <span id="LC185" 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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177
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186
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<pre style="margin: 0;"> <span id="LC186" 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="diff-line-num unfold js-unfold old_line" data-linenumber="189" 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="198" 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">@@ -189,10 +198,8 @@ getClosureDataFromHeapRep heapRep infoTablePtr pts = do</td>
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189
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198
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="haskell"> <span class="n" style="color: #333;">npts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">drop</span> <span class="p">(</span><span class="n" style="color: #333;">closureTypeHeaderSize</span> <span class="p">(</span><span class="n" style="color: #333;">tipe</span> <span class="n" style="color: #333;">itbl</span><span class="p">)</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">pts</span><span class="p">)</span> <span class="n" style="color: #333;">rawHeapWords</span></span>
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190
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199
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tipe</span> <span class="n" style="color: #333;">itbl</span> <span class="kr" style="font-weight: 600;">of</span></span>
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191
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200
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<pre style="margin: 0;"> <span id="LC200" class="line" lang="haskell"> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">>=</span> <span class="kt" style="color: #458; font-weight: 600;">CONSTR</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;"><=</span> <span class="kt" style="color: #458; font-weight: 600;">CONSTR_NOCAF</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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192
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<pre style="margin: 0;">-<span id="LC192" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">m</span><span class="p">,</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dataConNames</span> <span class="n" style="color: #333;">infoTablePtr</span></span>
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193
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<pre style="margin: 0;">-<span id="LC193" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">==</span> <span class="s" style="color: #d14;">"GHC.ByteCode.Instr"</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">==</span> <span class="s" style="color: #d14;">"BreakInfo"</span></span>
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194
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<pre style="margin: 0;">-<span id="LC194" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <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;">UnsupportedClosure</span> <span class="n" style="color: #333;">itbl</span></span>
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195
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<pre style="margin: 0;">-<span id="LC195" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">ConstrClosure</span> <span class="n" style="color: #333;">itbl</span> <span class="n" style="color: #333;">pts</span> <span class="n" style="color: #333;">npts</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">n</span></span>
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201
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<pre style="margin: 0;">+<span id="LC201" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">m</span><span class="p">,</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getConDesc</span></span>
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202
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<pre style="margin: 0;">+<span id="LC202" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">ConstrClosure</span> <span class="n" style="color: #333;">itbl</span> <span class="n" style="color: #333;">pts</span> <span class="n" style="color: #333;">npts</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">n</span></span>
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="haskell"> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">>=</span> <span class="kt" style="color: #458; font-weight: 600;">THUNK</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;"><=</span> <span class="kt" style="color: #458; font-weight: 600;">THUNK_STATIC</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<td class="diff-line-num old_line" data-linenumber="198" 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">
198
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<td class="diff-line-num new_line" data-linenumber="205" 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">
205
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<pre style="margin: 0;"> <span id="LC205" 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;">ThunkClosure</span> <span class="n" style="color: #333;">itbl</span> <span class="n" style="color: #333;">pts</span> <span class="n" style="color: #333;">npts</span></span>
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