[PATCH] D31670: [coroutines] Implement correct GRO lifetime

[Gor Nishanov via Phabricator via cfe-commits]

GorNishanov created this revision.
Herald added a subscriber: EricWF.

Sema creates a declaration for gro variable as:

  auto $gro = $promise.get_return_object();

However, gro variable has to outlive coroutine frame and coroutine promise, but,
it can only be initialized after the coroutine promise was created, thus, we
split its emission in two parts: EmitGroAlloca emits an alloca and sets up
the cleanups. Later when the coroutine promise is available we initialize
the gro and set the flag that the cleanup is now active.


https://reviews.llvm.org/D31670

Files:
  lib/CodeGen/CGCoroutine.cpp
  test/CodeGenCoroutines/coro-gro.cpp

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