[PATCH] D56855: Add ___Z demangling to new common demangle function

[George Rimar via Phabricator via llvm-commits]

grimar added inline comments.


================
Comment at: lib/Demangle/Demangle.cpp:18-19
   char *Demangled;
-  if (MangledName.compare(0, 2, "_Z") == 0)
+  if (MangledName.compare(0, 2, "_Z") == 0 ||
+      MangledName.compare(0, 4, "___Z") == 0)
     Demangled = itaniumDemangle(MangledName.c_str(), nullptr, nullptr, nullptr);
----------------
jhenderson wrote:
> erik.pilkington wrote:
> > As of r351481, we allow leading underscores on these. Maybe it would be easier to flip this around so we call microsoftDemangle if the name starts with `?`, then itaniumDemangle otherwise?
> @erik.pilkington, flipping it around would adversely affect the behaviour, because `itaniumDemangle` can also do demangling of types, which aren't strictly fully encoded mangled names. Based on code-inspection, I believe an input string of, say, 'v', would become 'void', which is clearly wrong behaviour for a variable with the name 'v'. At the same time, having to check for `_Z`, `__Z`, `___Z` and `____Z` seems silly. I'll see if I can come up with a better solution.
> 
> @grimar, my understanding is that it would compare the entirety of the first string against the other side, which would fail (unless the string was for example "_Z"). Is that what you understand after your re-read?
Yes, I mixed "compared string" with "comparing string". Sorry for the noise.


Repository:
  rL LLVM

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  https://reviews.llvm.org/D56855/new/

https://reviews.llvm.org/D56855