[cfe-commits] [PATCH] Grab bag of Microsoft C++ ABI Mangler fixes

Charles Davis cdavis at mymail.mines.edu
Sun Jun 10 22:41:37 PDT 2012

On Jun 9, 2012, at 5:49 PM, Richard Smith wrote:

> On Sat, Jun 9, 2012 at 2:41 PM, Charles Davis <cdavis at mymail.mines.edu> wrote:
> Hi,
> This is a grab bag of various fixes to the VC++ name mangler.
> - The mangler is now capable of mangling the names of virtual function tables--but not virtual base tables. That needs a serious refactoring of the ManglerContext's interface.
> - Local names are now mangled correctly--complete with anonymous numbered scopes. I needed this to make the virtual table test case--which I copied from the Itanium ABI test cases--work.
> - Instead of throwing an llvm_unreachable(), unimplemented cases now raise a compiler error. (This was the hardest part, since I needed source locations to give to the DiagnosticsEngine.
> This is a big patch, so I wanted to run it past the list before I commit. OK to commit?
> @@ -1087,10 +1211,22 @@
>        Dimensions.push_back(CAT->getSize());
>        ElementTy = CAT->getElementType();
>      } else if (ElementTy->isVariableArrayType()) {
> -      llvm_unreachable("Don't know how to mangle VLAs!");
> +      const VariableArrayType *VAT =
> +        static_cast<const VariableArrayType *>(ElementTy.getTypePtr());
> Don't do this, use ASTContext::getAsVariableArrayType(ElementTy) instead.
Now how did that get past? Fixed.
> Can you use a SmallVector<TemplateArgumentLoc> rather than allocating ASTTemplateArgumentListInfo objects in isTemplate?
> Several of your "cannot mangle this yet" diagnostics have unwanted fallthrough. Should these be fatal?
I've fixed all of them to return early.
> I would remove "Oddly enough, " throughout.
Done. It is too informal anyway.
> Is there a reason to create a new test file rather than adding tests to mangle-ms.cpp?
Because the corresponding tests for the Itanium ABI (on which these are based) were in a separate file (cf. <clang>/test/CodeGenCXX/mangle-abi-examples.cpp).

New patch attached. OK to commit?

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