[LLVMdev] Debug info: test crashes at -O0
Oleg Ranevskyy
llvm.mail.list at gmail.com
Wed Jun 10 12:42:31 PDT 2015
Hi Duncan,
For one of my tasks I am checking the LLVM tests with -O0 passed to llc.
There are some llc crashes and one of them happens on the
CodeGen/ARM/debug-info-d16-reg.ll test. It has two DILocalVariable's
with the same arg number:
!50 = !DILocalVariable(tag: DW_TAG_arg_variable, name: "val", line: 4,
arg: 2, scope: !9, file: !1, type: !7)
!51 = !DILocalVariable(tag: DW_TAG_arg_variable, name: "c", line: 4,
arg: 2, scope: !9, file: !1, type: !8).
This breaks the assert condition "assert(V.Var == Var && "conflicting
variable")" in DbgVariable::addMMIEntry, as the two entries ("c" and
"val") with different DILocalVariable* pointers are added to the same
DbgVariable. In release build it crashes later on a null pointer
dereference.
Although this is an obvious mistake as the IR is handwritten, it might
be a good idea to adjust the code so that it doesn't crash and shows a
comprehensive error message instead.
Would you share you thoughts whether this makes sense, please?
Thanks.
Oleg
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