[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
diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
index 7e99bdb..4a7cc02 100644
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -1986,7 +1986,7 @@
/// pointer to a char.
Address EmitMSVAListRef(const Expr *E);
- /// EmitAnyExprToTemp - Similary to EmitAnyExpr(), however, the result will
+ /// EmitAnyExprToTemp - Similarly to EmitAnyExpr(), however, the result will
/// always be accessible even if no aggregate location is provided.
RValue EmitAnyExprToTemp(const Expr *E);
@@ -2528,6 +2528,12 @@
void EmitCoroutineBody(const CoroutineBodyStmt &S);
void EmitCoreturnStmt(const CoreturnStmt &S);
+ RValue EmitCoawaitExpr(const CoawaitExpr &E,
+ AggValueSlot aggSlot = AggValueSlot::ignored(),
+ bool ignoreResult = false);
+ RValue EmitCoyieldExpr(const CoyieldExpr &E,
+ AggValueSlot aggSlot = AggValueSlot::ignored(),
+ bool ignoreResult = false);
RValue EmitCoroutineIntrinsic(const CallExpr *E, unsigned int IID);
void EnterCXXTryStmt(const CXXTryStmt &S, bool IsFnTryBlock = false);