[PATCH] D37131: [coroutines] Support coroutine-handle returning await-suspend (i.e symmetric control transfer)

Gor Nishanov via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Thu Aug 24 21:11:57 PDT 2017

GorNishanov created this revision.

If await_suspend returns a coroutine_handle, as in the example below:

  coroutine_handle<> await_suspend(coroutine_handle<> h) {
    coro.promise().waiter = h;
    return coro;

suspensionExpression processing will resume the coroutine pointed at by that handle.
Related LLVM change https://reviews.llvm.org/rL311751 makes resume calls of this kind `musttail` at any optimization level.

This enables unlimited symmetric control transfer from coroutine to coroutine without blowing up the stack.



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