================
@@ -8261,12 +8261,19 @@ def CoroAwaitElidableDoc : Documentation {
The ``[[clang::coro_await_elidable]]`` is a class attribute which can be
applied
to a coroutine return type.
-When a coroutine function that returns such a type calls another coroutine
function,
-the compiler performs heap allocation elision when the call to the coroutine
function
-is immediately co_awaited as a prvalue. In this case, the coroutine frame for
the
-callee will be a local variable within the enclosing braces in the caller's
stack
-frame. And the local variable, like other variables in coroutines, may be
collected
-into the coroutine frame, which may be allocated on the heap.
+When a coroutine function returns such a type, a direct call expression therein
+that returns a prvalue of a type attributed ``[[clang::coro_await_elidable]]``
+is said to be under a safe elide context if one of the following is true:
----------------
yuxuanchen1997 wrote:
> If I am reading the code correctly, it is not actually a requirement that the
> containing / callee coroutine itself is also annotated as coro_await_elidable.
It is required. See `CurFnAwaitElidable`. Your example call to `foo()` of
`NonElidableTask` won't have any elisions because we don't control
`NonElidableTask::Promise::await_transform`.
https://github.com/llvm/llvm-project/pull/108474
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