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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [DebugInfo] DbgEntityHistoryCalculator assumes "last" block is exit block"
href="https://bugs.llvm.org/show_bug.cgi?id=41869">41869</a>
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<th>Summary</th>
<td>[DebugInfo] DbgEntityHistoryCalculator assumes "last" block is exit block
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Keywords</th>
<td>wrong-debug
</td>
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Common Code Generator Code
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>jeremy.morse.llvm@gmail.com
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<th>CC</th>
<td>chackz0x12@gmail.com, david.stenberg@ericsson.com, greg.bedwell@sony.com, llvm-bugs@lists.llvm.org, orlando.hyams@sony.com, paul.robinson@am.sony.com, stephen.tozer@sony.com
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<pre>As it stands, DbgEntityHistoryCalculator currently makes the assumption [0]
that the last (by order) basic block in a function is the exit block. This
sometimes isn't true, for various reasons (block layout, PGO, tail duplication
etc) and yet "open ended" debug locations are something that other parts of
DwarfDebug rely on, for example the validThroughout function.
This probably isn't a high priority item given other debuginfo problems; but
something that should eventually be addressed.
[0]
<a href="https://github.com/llvm/llvm-project/blob/c93f56d39e629b7bcd0f4657705264fcd7e47c0d/llvm/lib/CodeGen/AsmPrinter/DbgEntityHistoryCalculator.cpp#L355">https://github.com/llvm/llvm-project/blob/c93f56d39e629b7bcd0f4657705264fcd7e47c0d/llvm/lib/CodeGen/AsmPrinter/DbgEntityHistoryCalculator.cpp#L355</a></pre>
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