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Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/4ad37a323b9cdb830d718dec08c2960e34410a43">4ad37a32</a></strong>
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<span>by Ben Gamari</span>
<i>at 2019-05-30T11:29:47Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Handle zero-sized mappings in MachO linker
As noted in #16701, it is possible that we will find that an object has
no segments needing to be mapped. Previously this would result in mmap
being called for a zero-length mapping, which would fail. We now simply
skip the mmap call in this case; the rest of the logic just works.
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<h4>1 changed file:</h4>
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<a href="#f4db9593d88d3c951505379e54f3db74f49ae142">
rts/linker/MachO.c
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<h4>Changes:</h4>
<li id="f4db9593d88d3c951505379e54f3db74f49ae142">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/4ad37a323b9cdb830d718dec08c2960e34410a43#f4db9593d88d3c951505379e54f3db74f49ae142"><strong>rts/linker/MachO.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">@@ -1122,8 +1122,12 @@ ocBuildSegments_MachO(ObjectCode *oc)</td>
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1122
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<pre style="margin: 0;"> <span id="LC1122" class="line" lang="c"> <span class="n" style="color: #333;">n_activeSegments</span><span class="o" style="font-weight: 600;">++</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC1123" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1124" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC1125" class="line" lang="c"> <span class="n" style="color: #333;">mem</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mmapForLinker</span><span class="p">(</span><span class="n" style="color: #333;">size_compound</span><span class="p">,</span> <span class="n" style="color: #333;">MAP_ANON</span><span class="p">,</span> <span class="o" style="font-weight: 600;">-</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>
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1126
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<pre style="margin: 0;">-<span id="LC1126" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="nb" style="color: #0086b3;">NULL</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">mem</span><span class="p">)</span> <span class="k" style="font-weight: 600;">return</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC1125" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// N.B. it's possible that there is nothing mappable in an object. In this</span></span>
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<pre style="margin: 0;">+<span id="LC1126" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// case we avoid the mmap call since it would fail. See #16701.</span></span>
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<pre style="margin: 0;">+<span id="LC1127" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">size_compound</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC1128" class="line" lang="c"> <span class="n" style="color: #333;">mem</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mmapForLinker</span><span class="p">(</span><span class="n" style="color: #333;">size_compound</span><span class="p">,</span> <span class="n" style="color: #333;">MAP_ANON</span><span class="p">,</span> <span class="o" style="font-weight: 600;">-</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>
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1129
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<pre style="margin: 0;">+<span id="LC1129" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="nb" style="color: #0086b3;">NULL</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">mem</span><span class="p">)</span> <span class="k" style="font-weight: 600;">return</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC1130" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1131" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC1132" class="line" lang="c"> <span class="n" style="color: #333;">IF_DEBUG</span><span class="p">(</span><span class="n" style="color: #333;">linker</span><span class="p">,</span> <span class="n" style="color: #333;">debugBelch</span><span class="p">(</span><span class="s" style="color: #d14;">"ocBuildSegments: allocating %d segments</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">,</span> <span class="n" style="color: #333;">n_activeSegments</span><span class="p">));</span></span>
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<pre style="margin: 0;"> <span id="LC1133" class="line" lang="c"> <span class="n" style="color: #333;">segments</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">Segment</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">stgCallocBytes</span><span class="p">(</span><span class="n" style="color: #333;">n_activeSegments</span><span class="p">,</span> <span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">Segment</span><span class="p">),</span></span>
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