llvm-svn: 124646

* llvm-link would complains about mismatched visibility
* If we produce a relocation with an available_externally, it is good to know that
it is hidden.

llvm-svn: 124633

Allow taking the address of such a field for a pointer-to-member constant. Fixes rdar://8818236.

llvm-svn: 124575

current translation unit as available_externally. 

This helps devirtualize the second example in PR3100, comment 18:

struct S { S() {}; virtual void xyzzy(); };
inline void foo(S *s) { s->xyzzy(); }
void bar() { S s; foo(&s); }

This involved four major changes:

1. In DefineUsedVTables, always mark virtual member functions as referenced for
   non-template classes and class template specializations.
2. In CodeGenVTables::ShouldEmitVTableInThisTU return true if optimizations are
   enabled, even if the key function is not implemented in this translation 
   unit. We don't ever do this for code compiled with -fapple-kext, because we
   don't ever want to devirtualize virtual member function calls in that case.
3. Give the correct linkage for vtables where the key function is not defined.
4. Update the linkage for RTTI structures when necessary.

llvm-svn: 124565

llvm-svn: 124554

When emitting RTTI for a non-class type, compute the visibility of the RTTI data based on the explicit visibility of the type.

llvm-svn: 124553

llvm-svn: 124550

Set the visibility for typeinfo names.

llvm-svn: 124548

Change CodeGenModule::setTypeVisibility to take a TypeVisibilityKind enum instead of an "IsForRTTI" flag.

llvm-svn: 124546

llvm-svn: 124542

llvm-svn: 124541

llvm-svn: 124540

Make emitting a VTT a two-step process, much like emitting a VTable. You first get the address of the VTT, and then pass it to EmitVTTDefinition.

llvm-svn: 124539

llvm-svn: 124538

Add a new function, to be used by CGRTTI, CGVTables and CGVTT (which each has their own copy of this code).

llvm-svn: 124537

llvm-svn: 124536

llvm-svn: 124529

When trying to get the most derived class, don't assume that we can ignore all casts. We can only ignore derived-to-base and no-op casts. Fixes selfhost.

llvm-svn: 124528

When calling a virtual member function on a base class and the most derived class is marked 'final', we can devirtualize the call.

llvm-svn: 124524

When doing a derived-to-base class through a virtual class, we don't have to get the vbase offset from the vtable if the derived class is marked final.

llvm-svn: 124523

indirect vf calls and addition of extra entry
at bottom of vtbls.

llvm-svn: 124507

llvm-svn: 124503

Pure motion.

llvm-svn: 124484

for CodeGen's RValue type.

llvm-svn: 124483

fixing a crash which probably nobody was ever going to see.  In doing so,
fix a horrendous number of problems with the conditional-cleanups code.
Also, make conditional cleanups re-use the cleanup's activation variable,
which avoids some unfortunate repetitiveness.

llvm-svn: 124481

non-class prvalues actually require the realization of a
temporary. For everything else, we already have an lvalue (or class
prvalue) in the subexpression.

Note: we're missing some move elision in this case. I'll tackle that next.
llvm-svn: 124453

deallocation function has a two-argument form.  Store the result of this
check in new[] and delete[] nodes.

Fixes rdar://problem/8913519

llvm-svn: 124373

My thanks to chapuni for his help in investigating this.

llvm-svn: 124351

referenced in the block-literal initializer
of that variable. // rdar://8893785

llvm-svn: 124332

llvm-svn: 124310

dtor cleanup use it.

llvm-svn: 124309

I'm separately committing this because it incidentally changes some
block orderings and minor IR issues, like using a phi instead of
an unnecessary alloca.

llvm-svn: 124277

llvm-svn: 124227

llvm-svn: 124153

llvm-svn: 124146

llvm-svn: 124122

llvm-svn: 124096

llvm-svn: 124095

llvm-svn: 124094

Mark VTables and RTTI data linkonce_odr instead of weak_odr, with the exception of explicit template instantiations, which have to be weak_odr.

This fixes PR6996.

llvm-svn: 124089