https://llvm.org/bugs/show_bug.cgi?id=27525
Bug ID: 27525
Summary: Possible bug in ARMAsmBackend::processFixupValue()?
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: daniel.sand...@imgtec.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
While looking into a MIPS issue with our fixup handling, I noticed that the
caller of processFixupValue() ignores any modifications to the 'Value' result.
The caller (MCAssembler::handleFixup()) makes it look like the modified value
is used but if you look inside ELFObjectWriter::recordRelocation() you'll see
that FixedValue is never read before it is overwritten. The same is true of
WinCOFFObjectWriter::recordRelocation(), and is true for most code paths in
ARMMachObjectWriter::recordRelocation().
ARM is currently the only target to modify the Value argument and does so for
certain fixups involving Thumb functions. Deleting the relevant code doesn't
cause any test failures so it seems that there are either no tests covering it
or something else is doing the same job.
Hope this helps.
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