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We need to walk the class hierarchy twice: once in depth-first base
specifier order for mangling and again in depth-first layout order for
vftable layout.

Vftable layout seems to depend on the full path from the most derived
class to the base containing the vfptr.

Fixes PR21031.

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Deleted virtual functions get _purecall inserted into the vftable.
Earlier CTPs would simply stick nullptr in there.

N.B.  MSVC can't handle deleted virtual functions which require return
adjusting thunks, they give an error that a deleted function couldn't be
called inside of a compiler generated function.  We get this correct by
making the thunk have a __purecall entry as well.

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Reviewed at http://reviews.llvm.org/D4829

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As suggested by Reid:

 - class has GVA_Internal linkage -> internal
 - thunk has return adjustment -> weak_odr, to handle evil corner case [1]
 - all other normal methods -> linkonce_odr

 1. Evil corner case:

  struct Incomplete;
  struct A { int a; virtual A *bar(); };
  struct B { int b; virtual B *foo(Incomplete); };
  struct C : A, B { int c; virtual C *foo(Incomplete); };
  C c;

Here, the thunk for C::foo() will be emitted when C::foo() is defined, which
might be in a different translation unit, so it needs to be weak_odr.

Differential Revision: http://reviews.llvm.org/D3992

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Reviewed at http://reviews.llvm.org/D3410

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Reviewed at http://llvm-reviews.chandlerc.com/D3181

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Fixes PR19240.  In retrospect, this is a fairly obvious bug.  :)

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Simplify test/CodeGenCXX/microsoft-abi-vtables-virtual-inheritance.cpp by forcing VFTableBuilder invocation with virtual function calls or constructors codegen

Previously the vftables were built at the end of the TU in a reverse-to-random order

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Fix PR19172 - wrong this adjustment calculated for virtual destructor in a class with complex inheritance

Reviewed at http://llvm-reviews.chandlerc.com/D3128

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Summary:
This merges VFPtrInfo and VBTableInfo into VPtrInfo, since they hold
almost the same information.  With that change, the vbtable mangling
code can easily be applied to vftable data and we magically get the
correct, unambiguous vftable names.

Fixes PR17748.

Reviewers: timurrrr, majnemer

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D2893

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This makes the C++ ABI depend entirely on the target: MS ABI for -win32 triples,
Itanium otherwise. It's no longer possible to do weird combinations.

To be able to run a test with a specific ABI without constraining it to a
specific triple, new substitutions are added to lit: %itanium_abi_triple and
%ms_abi_triple can be used to get the current target triple adjusted to the
desired ABI. For example, if the test suite is running with the i686-pc-win32
target, %itanium_abi_triple will expand to i686-pc-mingw32.

Differential Revision: http://llvm-reviews.chandlerc.com/D2545

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This makes it consistent with -fdump-record-layouts, which was moved to
outs() in r186219.  My reasoning for going with stdout is that when one
of these options is present, the layouts are really a program output,
and shouldn't be interleaved with diagnostics, which are on stderr.

Reviewers: timurrrr

Differential Revision: http://llvm-reviews.chandlerc.com/D2127

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Make thunk this/return adjustment ABI-specific. Also, fix the return adjustment when using -cxx-abi microsoft

Reviewed at http://llvm-reviews.chandlerc.com/D2026

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[-cxx-abi microsoft] Fix this argument/parameter offsets for virtual destructors in the presence of virtual bases

Reviewed at http://llvm-reviews.chandlerc.com/D1939

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Reland 192220 "Abstract out parts of thunk emission code, add support for simple thunks when using -cxx-abi microsoft" with relaxed assertions

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Abstract out parts of thunk emission code, add support for simple thunks when using -cxx-abi microsoft

Reviewed at http://llvm-reviews.chandlerc.com/D1787

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Abstract out the emission of vtables, add basic support for vtable emission when using -cxx-abi microsoft

Reviewed at http://llvm-reviews.chandlerc.com/D1532

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