[Sema] Mark a virtual CXXMethodDecl as used if a call to it can be

2017-07-13T06:08:27+00:00

devirtualized.

The code to detect devirtualized calls is already in IRGen, so move the
code to lib/AST and make it a shared utility between Sema and IRGen.

This commit fixes a linkage error I was seeing when compiling the
following code:

$ cat test1.cpp
struct Base {
  virtual void operator()() {}
};

template
struct Derived final : Base {
  void operator()() override {}
};

Derived *d;

int main() {
  if (d)
    (*d)();
  return 0;
}

rdar://problem/33195657

Differential Revision: https://reviews.llvm.org/D34301

llvm-svn: 307883

Prevent devirtualization of calls to un-instantiated functions.

2017-06-20T22:08:44+00:00

PR 27895

Differential Revision: https://reviews.llvm.org/D22057

llvm-svn: 305862

llvm-project.git/clang/test/CodeGen/no-devirt.cpp, branch users/nico/python-2

[Sema] Mark a virtual CXXMethodDecl as used if a call to it can be

Prevent devirtualization of calls to un-instantiated functions.