[llvm-dev] aarch64 do not generate debug info for tls var

[kamlesh kumar via llvm-dev]

Hi Devs,

consider below testcase
$cat test.c
__thread int mtls=1;
void foo(){
mtls++;
}

it emits this debug info for mtls

0x0000002a:   DW_TAG_variable
                DW_AT_name      ("mtls")
                DW_AT_type      (0x00000035 "int")
                DW_AT_external  (true)
                DW_AT_decl_file ("test.c")
                DW_AT_decl_line (1)

which does not contain DW_AT_Location.

Currently, aarch64 does not emit DW_AT_Location for TLS variables.
I could see at this line, it says some restriction in aarch64 elf abi.
https://github.com/llvm-mirror/llvm/blob/master/lib/Target/AArch64/AArch64TargetObjectFile.cpp#L24

I would like to know community thoughts on this and is there any other way
to tackle this, or we simply can not debug TLS variables for this
architecture?


./Kamlesh
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