https://bugs.llvm.org/show_bug.cgi?id=40855
Bug ID: 40855
Summary: ExceptionDataRecord::EpilogueCount returns wrong
amount in some cases on aarch64
Product: libraries
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Support Libraries
Assignee: unassignedb...@nondot.org
Reporter: froy...@gmail.com
CC: dma...@mozilla.com, llvm-bugs@lists.llvm.org,
mar...@martin.st
I have an aarch64 executable with a function that llvm-readelf claims has 123
(!) epilogue scopes. This is fine as far as it goes, but 123 is wrong, because
this code:
https://github.com/llvm-mirror/llvm/blob/f25266101e3a715fb377960a7cf99c4f9ec2f37e/include/llvm/Support/ARMWinEH.h#L385-L392
is wrong: in the HeaderWords() != 1 case, we're trying to extract a 16-bit
field, but the return type of the function truncates that 16-bit quantity to 8
bits. The actual amount is 891 (!), which is similarly unbelievable, but there
you go.
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