rnk added a comment.
Compiling with -fdump-record-layouts revealed the problem:
*** Dumping AST Record Layout
0 | struct llvm::coverage::CovMapFunctionRecordV3
0 | struct llvm::coverage::accessors::FuncHashAndDataSize<struct
llvm::coverage::CovMapFunctionRecordV3> (base) (empty)
1 | struct llvm::coverage::accessors::HashedNameRef<struct
llvm::coverage::CovMapFunctionRecordV3> (base) (empty)
1 | const int64_t NameRef
9 | const uint32_t DataSize
13 | const uint64_t FuncHash
21 | const uint64_t FilenamesRef
29 | const char CoverageMapping
| [sizeof=30, align=1,
| nvsize=30, nvalign=1]
Everything is off-by-one because the empty bases are not zero sized. The MSVC
record layout algorithm is just different in this area. =/
So, I think this patch would be fine if you refactor it to avoid the accessor
classes. I took a stab at it, but it's not straightforward.
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D69471/new/
https://reviews.llvm.org/D69471
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