https://bugs.llvm.org/show_bug.cgi?id=45950
Bug ID: 45950
Summary: LLD generates duplicate .pdata chunks
Product: lld
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: COFF
Assignee: unassignedb...@nondot.org
Reporter: alexandre.ga...@ubisoft.com
CC: llvm-bugs@lists.llvm.org, pe...@pcc.me.uk,
r...@google.com
We stumped on a case where LLD generates two identical RUNTIME_FUNCTION for the
same function, but with different UNWIND_INFO. This looks like an error, for
the same .OBJs, link.exe does not generate duplicates.
Function Table
Begin End Info Function Name
0049D0DC 0554E9D0 0554E9F7 06ACBCE8
Unwind version: 1
Unwind flags: EHANDLER UHANDLER
Size of prologue: 0x0A
Count of codes: 2
Unwind codes:
0A: ALLOC_SMALL, size=0x30
06: PUSH_NONVOL, register=rbp
Handler: 05503340
0049D0E8 0554E9D0 0554E9F7 06ACB0E8
Unwind version: 1
Unwind flags: EHANDLER UHANDLER
Size of prologue: 0x0A
Count of codes: 2
Unwind codes:
0A: ALLOC_SMALL, size=0x30
06: PUSH_NONVOL, register=rbp
Handler: 05503340
Here, we get two RUNTIME_FUNCTION for function 0554E9D0, but two different
Info/UNWIND_INFO.
Interestingly, for the same inputs, we get a different number of entries
between different linkers:
VS2019 16.5.4 link.exe : Function Table (316955)
LLD 8.0: Function Table (316888)
LLD 10.0: Function Table (316959)
Any idea of what could be going on here? I was under the impression that we
need more than xxHash64 folding for .pdata chunks? Maybe a specific step after
ICF? I will dig next week.
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