https://bugs.llvm.org/show_bug.cgi?id=41869
Bug ID: 41869
Summary: [DebugInfo] DbgEntityHistoryCalculator assumes "last"
block is exit block
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Keywords: wrong-debug
Severity: normal
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: jeremy.morse.l...@gmail.com
CC: chackz0...@gmail.com, david.stenb...@ericsson.com,
greg.bedw...@sony.com, llvm-bugs@lists.llvm.org,
orlando.hy...@sony.com, paul.robin...@am.sony.com,
stephen.to...@sony.com
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]
https://github.com/llvm/llvm-project/blob/c93f56d39e629b7bcd0f4657705264fcd7e47c0d/llvm/lib/CodeGen/AsmPrinter/DbgEntityHistoryCalculator.cpp#L355
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