MaskRay added a comment.
In D137227#3908994 <https://reviews.llvm.org/D137227#3908994>, @sbc100 wrote:
> At least for WebAssembly object files, it looks like the symbol table now
> contains (what look like) demangled symbols. e.g.:
>
> $ llvm-nm /tmp/emscripten_temp/command_0.o
> 00003ef5 D __odr_asan_gen__numargs
> 000041a6 D __odr_asan_gen__stdcmd<1068>::init
> 000041c3 D __odr_asan_gen__stdcmd<1069>::init
> 000041e0 D __odr_asan_gen__stdcmd<1070>::init
> 000041fd D __odr_asan_gen__stdcmd<1071>::init
> 0000421a D __odr_asan_gen__stdcmd<1073>::init
> 0000423f D __odr_asan_gen__stdcmd<1074>::init
> 0000425c D __odr_asan_gen__stdcmd<1075>::init
> 00004279 D __odr_asan_gen__stdcmd<1076>::init
> 0000429e D __odr_asan_gen__stdcmd<1077>::init
> 000042bc D __odr_asan_gen__stdcmd<1078>::init
>
> Symbol names with colon in them currently cause issues with the emscripten
> compiler (when parsing the output of `llvm-nm`). If this is intensional we
> can look into re-working the parser, but I just wanted to check if this was
> indented behaviour? Are these character allows in symbol names?
The asan instrumentation just prepends `__odr_asan_gen_` to the symbol name to
form a new symbol name. For ELF every byte except `\0` can be used in a symbol
name, and this is totally fine.
I am unfamiliar with WebAssembly. Does the aforementioned parsing tool somehow
skip printing `_stdcmd<1068>::init` symbols?
================
Comment at: llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp:777
// Enable aliases as they should have no downside with ODR indicators.
- UsePrivateAlias(UseOdrIndicator || ClUsePrivateAlias),
- UseOdrIndicator(UseOdrIndicator || ClUseOdrIndicator),
+ UsePrivateAlias(UseOdrIndicator && ClUsePrivateAlias),
+ UseOdrIndicator(UseOdrIndicator && ClUseOdrIndicator),
----------------
vitalybuka wrote:
> It should be
> ```
> UseOdrIndicator(ClUseOdrIndicator.getNumOccurrences() > 0 ? ClUseOdrIndicator
> : UseOdrIndicator),
> ClUsePrivateAlias(ClUsePrivateAlias.getNumOccurrences() > 0 ?
> ClUsePrivateAlias : UseOdrIndicator),
> ```
>
> My rule of thumb is Cl flags, which are mostly for testing, must be direct
> and do exactly what was asked, even if it's not useful, and they should
> override fronted parameters.
>
Good catch. I agree with this analysis.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D137227/new/
https://reviews.llvm.org/D137227
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