Commit Graph

4 Commits

Author SHA1 Message Date
Gor Nishanov e4f15a2bf0 [coroutines] Skip over passthrough operator co_await
https://reviews.llvm.org/D31627

llvm-svn: 303605
2017-05-23 05:25:31 +00:00
Gor Nishanov 5efc61866d [coroutines] Add emission of initial and final suspends
https://reviews.llvm.org/D31608

llvm-svn: 303603
2017-05-23 05:04:01 +00:00
Gor Nishanov 68fe6ee768 [coroutines] Replace all coro.frame builtins with an SSA value of coro.begin
SemaCoroutine forms expressions referring to the coroutine frame of the enclosing coroutine using coro.frame builtin.
During codegen, we emit llvm.coro.begin intrinsic that returns the address of the coroutine frame.
When coro.frame is emitted, we replace it with SSA value of coro.begin.

llvm-svn: 303598
2017-05-23 03:46:59 +00:00
Gor Nishanov 5eb585836a [coroutines] Add codegen for await and yield expressions
Details:

Emit suspend expression which roughly looks like:

auto && x = CommonExpr();
if (!x.await_ready()) {
   llvm_coro_save();
   x.await_suspend(...);     (*)
   llvm_coro_suspend(); (**)
}
x.await_resume();
where the result of the entire expression is the result of x.await_resume()

(*) If x.await_suspend return type is bool, it allows to veto a suspend:
if (x.await_suspend(...))
   llvm_coro_suspend();
(**) llvm_coro_suspend() encodes three possible continuations as a switch instruction:

%where-to = call i8 @llvm.coro.suspend(...)
switch i8 %where-to, label %coro.ret [ ; jump to epilogue to suspend
  i8 0, label %yield.ready   ; go here when resumed
  i8 1, label %yield.cleanup ; go here when destroyed
]

llvm-svn: 298784
2017-03-26 02:18:05 +00:00