[llvm-bugs] [Bug 38857] [codeview] Incorrect variable locations with stack realignment and call-frame optimization

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38857

Reid Kleckner <rnk at google.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #16 from Reid Kleckner <rnk at google.com> ---
I confirmed that the offsets changed in r346062, here's the symbol records
before and after:
     0 | S_LOCAL [size = 26] `remaining_bytes`
         type=0x0023 (unsigned __int64), flags = none
     0 | S_DEFRANGE_FRAMEPOINTER_REL [size = 16]
         offset = -12, range = [0000:0029,+343)
         gaps = 2
     0 | S_LOCAL [size = 32] `remaining_bytes_again`
         type=0x0023 (unsigned __int64), flags = none
     0 | S_DEFRANGE_FRAMEPOINTER_REL [size = 16]
         offset = -20, range = [0000:0029,+343)
         gaps = 2

after:
     0 | S_LOCAL [size = 26] `remaining_bytes`
         type=0x0023 (unsigned __int64), flags = none
     0 | S_DEFRANGE_FRAMEPOINTER_REL [size = 16]
         offset = -16, range = [0000:0029,+343)
         gaps = 2
     0 | S_LOCAL [size = 32] `remaining_bytes_again`
         type=0x0023 (unsigned __int64), flags = none
     0 | S_DEFRANGE_FRAMEPOINTER_REL [size = 16]
         offset = -24, range = [0000:0029,+343)
         gaps = 2

I had some trouble getting windbg to stop at the same point again, but
eventually I succeeded and now I see this:

0:029> dv
                 this = 0x11a43950
      remaining_bytes = 0x15aa48
remaining_bytes_again = 0x00000012`346678ab
                items = <value unavailable>

That looks right, so I'd say this is fixed. It should be in the next clang roll
which is tracked at https://crbug.com/894363

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