r285306 - [coroutines] Add allocation and deallocation substatements.
Gor Nishanov via cfe-commits
cfe-commits at lists.llvm.org
Thu Oct 27 09:28:32 PDT 2016
Author: gornishanov
Date: Thu Oct 27 11:28:31 2016
New Revision: 285306
URL: http://llvm.org/viewvc/llvm-project?rev=285306&view=rev
Log:
[coroutines] Add allocation and deallocation substatements.
Summary:
SemaCoroutine: Add allocation / deallocation substatements.
CGCoroutine/Test: Emit allocation and deallocation + test.
Reviewers: rsmith
Subscribers: ABataev, EricWF, llvm-commits, mehdi_amini
Differential Revision: https://reviews.llvm.org/D25879
Added:
cfe/trunk/test/CodeGenCoroutines/coro-alloc.cpp
Modified:
cfe/trunk/include/clang/AST/StmtCXX.h
cfe/trunk/lib/CodeGen/CGCoroutine.cpp
cfe/trunk/lib/CodeGen/CGStmt.cpp
cfe/trunk/lib/CodeGen/CodeGenFunction.h
cfe/trunk/lib/Sema/SemaCoroutine.cpp
Modified: cfe/trunk/include/clang/AST/StmtCXX.h
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/AST/StmtCXX.h?rev=285306&r1=285305&r2=285306&view=diff
==============================================================================
--- cfe/trunk/include/clang/AST/StmtCXX.h (original)
+++ cfe/trunk/include/clang/AST/StmtCXX.h Thu Oct 27 11:28:31 2016
@@ -304,6 +304,8 @@ class CoroutineBodyStmt : public Stmt {
FinalSuspend, ///< The final suspend statement, run after the body.
OnException, ///< Handler for exceptions thrown in the body.
OnFallthrough, ///< Handler for control flow falling off the body.
+ Allocate, ///< Coroutine frame memory allocation.
+ Deallocate, ///< Coroutine frame memory deallocation.
ReturnValue, ///< Return value for thunk function.
FirstParamMove ///< First offset for move construction of parameter copies.
};
@@ -313,6 +315,7 @@ class CoroutineBodyStmt : public Stmt {
public:
CoroutineBodyStmt(Stmt *Body, Stmt *Promise, Stmt *InitSuspend,
Stmt *FinalSuspend, Stmt *OnException, Stmt *OnFallthrough,
+ Expr *Allocate, Stmt *Deallocate,
Expr *ReturnValue, ArrayRef<Expr *> ParamMoves)
: Stmt(CoroutineBodyStmtClass) {
SubStmts[CoroutineBodyStmt::Body] = Body;
@@ -321,6 +324,8 @@ public:
SubStmts[CoroutineBodyStmt::FinalSuspend] = FinalSuspend;
SubStmts[CoroutineBodyStmt::OnException] = OnException;
SubStmts[CoroutineBodyStmt::OnFallthrough] = OnFallthrough;
+ SubStmts[CoroutineBodyStmt::Allocate] = Allocate;
+ SubStmts[CoroutineBodyStmt::Deallocate] = Deallocate;
SubStmts[CoroutineBodyStmt::ReturnValue] = ReturnValue;
// FIXME: Tail-allocate space for parameter move expressions and store them.
assert(ParamMoves.empty() && "not implemented yet");
@@ -345,6 +350,9 @@ public:
return SubStmts[SubStmt::OnFallthrough];
}
+ Expr *getAllocate() const { return cast<Expr>(SubStmts[SubStmt::Allocate]); }
+ Stmt *getDeallocate() const { return SubStmts[SubStmt::Deallocate]; }
+
Expr *getReturnValueInit() const {
return cast<Expr>(SubStmts[SubStmt::ReturnValue]);
}
Modified: cfe/trunk/lib/CodeGen/CGCoroutine.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGCoroutine.cpp?rev=285306&r1=285305&r2=285306&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/CGCoroutine.cpp (original)
+++ cfe/trunk/lib/CodeGen/CGCoroutine.cpp Thu Oct 27 11:28:31 2016
@@ -12,6 +12,7 @@
//===----------------------------------------------------------------------===//
#include "CodeGenFunction.h"
+#include "clang/AST/StmtCXX.h"
using namespace clang;
using namespace CodeGen;
@@ -36,9 +37,10 @@ struct CGCoroData {
clang::CodeGen::CodeGenFunction::CGCoroInfo::CGCoroInfo() {}
CodeGenFunction::CGCoroInfo::~CGCoroInfo() {}
-static bool createCoroData(CodeGenFunction &CGF,
+static void createCoroData(CodeGenFunction &CGF,
CodeGenFunction::CGCoroInfo &CurCoro,
- llvm::CallInst *CoroId, CallExpr const *CoroIdExpr) {
+ llvm::CallInst *CoroId,
+ CallExpr const *CoroIdExpr = nullptr) {
if (CurCoro.Data) {
if (CurCoro.Data->CoroIdExpr)
CGF.CGM.Error(CoroIdExpr->getLocStart(),
@@ -49,13 +51,27 @@ static bool createCoroData(CodeGenFuncti
else
llvm_unreachable("EmitCoroutineBodyStatement called twice?");
- return false;
+ return;
}
CurCoro.Data = std::unique_ptr<CGCoroData>(new CGCoroData);
CurCoro.Data->CoroId = CoroId;
CurCoro.Data->CoroIdExpr = CoroIdExpr;
- return true;
+}
+
+void CodeGenFunction::EmitCoroutineBody(const CoroutineBodyStmt &S) {
+ auto *NullPtr = llvm::ConstantPointerNull::get(Builder.getInt8PtrTy());
+ auto &TI = CGM.getContext().getTargetInfo();
+ unsigned NewAlign = TI.getNewAlign() / TI.getCharWidth();
+
+ auto *CoroId = Builder.CreateCall(
+ CGM.getIntrinsic(llvm::Intrinsic::coro_id),
+ {Builder.getInt32(NewAlign), NullPtr, NullPtr, NullPtr});
+ createCoroData(*this, CurCoro, CoroId);
+
+ EmitScalarExpr(S.getAllocate());
+ // FIXME: Emit the rest of the coroutine.
+ EmitStmt(S.getDeallocate());
}
// Emit coroutine intrinsic and patch up arguments of the token type.
Modified: cfe/trunk/lib/CodeGen/CGStmt.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGStmt.cpp?rev=285306&r1=285305&r2=285306&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/CGStmt.cpp (original)
+++ cfe/trunk/lib/CodeGen/CGStmt.cpp Thu Oct 27 11:28:31 2016
@@ -142,6 +142,8 @@ void CodeGenFunction::EmitStmt(const Stm
case Stmt::GCCAsmStmtClass: // Intentional fall-through.
case Stmt::MSAsmStmtClass: EmitAsmStmt(cast<AsmStmt>(*S)); break;
case Stmt::CoroutineBodyStmtClass:
+ EmitCoroutineBody(cast<CoroutineBodyStmt>(*S));
+ break;
case Stmt::CoreturnStmtClass:
CGM.ErrorUnsupported(S, "coroutine");
break;
Modified: cfe/trunk/lib/CodeGen/CodeGenFunction.h
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CodeGenFunction.h?rev=285306&r1=285305&r2=285306&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/CodeGenFunction.h (original)
+++ cfe/trunk/lib/CodeGen/CodeGenFunction.h Thu Oct 27 11:28:31 2016
@@ -2311,6 +2311,7 @@ public:
void EmitObjCAtSynchronizedStmt(const ObjCAtSynchronizedStmt &S);
void EmitObjCAutoreleasePoolStmt(const ObjCAutoreleasePoolStmt &S);
+ void EmitCoroutineBody(const CoroutineBodyStmt &S);
RValue EmitCoroutineIntrinsic(const CallExpr *E, unsigned int IID);
void EnterCXXTryStmt(const CXXTryStmt &S, bool IsFnTryBlock = false);
Modified: cfe/trunk/lib/Sema/SemaCoroutine.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaCoroutine.cpp?rev=285306&r1=285305&r2=285306&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/SemaCoroutine.cpp (original)
+++ cfe/trunk/lib/Sema/SemaCoroutine.cpp Thu Oct 27 11:28:31 2016
@@ -78,7 +78,7 @@ static QualType lookupPromiseType(Sema &
auto *Promise = R.getAsSingle<TypeDecl>();
if (!Promise) {
S.Diag(Loc, diag::err_implied_std_coroutine_traits_promise_type_not_found)
- << RD;
+ << RD;
return QualType();
}
@@ -92,7 +92,7 @@ static QualType lookupPromiseType(Sema &
PromiseType = S.Context.getElaboratedType(ETK_None, NNS, PromiseType);
S.Diag(Loc, diag::err_implied_std_coroutine_traits_promise_type_not_class)
- << PromiseType;
+ << PromiseType;
return QualType();
}
@@ -121,7 +121,7 @@ checkCoroutineContext(Sema &S, SourceLoc
//
// FIXME: We assume that this really means that a coroutine cannot
// be a constructor or destructor.
- S.Diag(Loc, diag::err_coroutine_ctor_dtor)
+ S.Diag(Loc, diag::err_coroutine_ctor_dtor)
<< isa<CXXDestructorDecl>(FD) << Keyword;
} else if (FD->isConstexpr()) {
S.Diag(Loc, diag::err_coroutine_constexpr) << Keyword;
@@ -130,8 +130,8 @@ checkCoroutineContext(Sema &S, SourceLoc
} else if (FD->isMain()) {
S.Diag(FD->getLocStart(), diag::err_coroutine_main);
S.Diag(Loc, diag::note_declared_coroutine_here)
- << (Keyword == "co_await" ? 0 :
- Keyword == "co_yield" ? 1 : 2);
+ << (Keyword == "co_await" ? 0 :
+ Keyword == "co_yield" ? 1 : 2);
} else {
auto *ScopeInfo = S.getCurFunction();
assert(ScopeInfo && "missing function scope for function");
@@ -162,6 +162,26 @@ checkCoroutineContext(Sema &S, SourceLoc
return nullptr;
}
+static Expr *buildBuiltinCall(Sema &S, SourceLocation Loc, Builtin::ID Id,
+ MutableArrayRef<Expr *> CallArgs) {
+ StringRef Name = S.Context.BuiltinInfo.getName(Id);
+ LookupResult R(S, &S.Context.Idents.get(Name), Loc, Sema::LookupOrdinaryName);
+ S.LookupName(R, S.TUScope, /*AllowBuiltinCreation=*/true);
+
+ auto *BuiltInDecl = R.getAsSingle<FunctionDecl>();
+ assert(BuiltInDecl && "failed to find builtin declaration");
+
+ ExprResult DeclRef =
+ S.BuildDeclRefExpr(BuiltInDecl, BuiltInDecl->getType(), VK_LValue, Loc);
+ assert(DeclRef.isUsable() && "Builtin reference cannot fail");
+
+ ExprResult Call =
+ S.ActOnCallExpr(/*Scope=*/nullptr, DeclRef.get(), Loc, CallArgs, Loc);
+
+ assert(!Call.isInvalid() && "Call to builtin cannot fail!");
+ return Call.get();
+}
+
/// Build a call to 'operator co_await' if there is a suitable operator for
/// the given expression.
static ExprResult buildOperatorCoawaitCall(Sema &SemaRef, Scope *S,
@@ -204,7 +224,7 @@ static ReadySuspendResumeResult buildCoa
const StringRef Funcs[] = {"await_ready", "await_suspend", "await_resume"};
for (size_t I = 0, N = llvm::array_lengthof(Funcs); I != N; ++I) {
Expr *Operand = new (S.Context) OpaqueValueExpr(
- Loc, E->getType(), VK_LValue, E->getObjectKind(), E);
+ Loc, E->getType(), VK_LValue, E->getObjectKind(), E);
// FIXME: Pass coroutine handle to await_suspend.
ExprResult Result = buildMemberCall(S, Operand, Loc, Funcs[I], None);
@@ -406,6 +426,113 @@ static ExprResult buildStdCurrentExcepti
return Res;
}
+// Find an appropriate delete for the promise.
+static FunctionDecl *findDeleteForPromise(Sema &S, SourceLocation Loc,
+ QualType PromiseType) {
+ FunctionDecl *OperatorDelete = nullptr;
+
+ DeclarationName DeleteName =
+ S.Context.DeclarationNames.getCXXOperatorName(OO_Delete);
+
+ auto *PointeeRD = PromiseType->getAsCXXRecordDecl();
+ assert(PointeeRD && "PromiseType must be a CxxRecordDecl type");
+
+ if (S.FindDeallocationFunction(Loc, PointeeRD, DeleteName, OperatorDelete))
+ return nullptr;
+
+ if (!OperatorDelete) {
+ // Look for a global declaration.
+ const bool CanProvideSize = S.isCompleteType(Loc, PromiseType);
+ const bool Overaligned = false;
+ OperatorDelete = S.FindUsualDeallocationFunction(Loc, CanProvideSize,
+ Overaligned, DeleteName);
+ }
+ S.MarkFunctionReferenced(Loc, OperatorDelete);
+ return OperatorDelete;
+}
+
+// Builds allocation and deallocation for the coroutine. Returns false on
+// failure.
+static bool buildAllocationAndDeallocation(Sema &S, SourceLocation Loc,
+ FunctionScopeInfo *Fn,
+ Expr *&Allocation,
+ Stmt *&Deallocation) {
+ TypeSourceInfo *TInfo = Fn->CoroutinePromise->getTypeSourceInfo();
+ QualType PromiseType = TInfo->getType();
+ if (PromiseType->isDependentType())
+ return true;
+
+ if (S.RequireCompleteType(Loc, PromiseType, diag::err_incomplete_type))
+ return false;
+
+ // FIXME: Add support for get_return_object_on_allocation failure.
+ // FIXME: Add support for stateful allocators.
+
+ FunctionDecl *OperatorNew = nullptr;
+ FunctionDecl *OperatorDelete = nullptr;
+ FunctionDecl *UnusedResult = nullptr;
+ bool PassAlignment = false;
+
+ S.FindAllocationFunctions(Loc, SourceRange(),
+ /*UseGlobal*/ false, PromiseType,
+ /*isArray*/ false, PassAlignment,
+ /*PlacementArgs*/ None, OperatorNew, UnusedResult);
+
+ OperatorDelete = findDeleteForPromise(S, Loc, PromiseType);
+
+ if (!OperatorDelete || !OperatorNew)
+ return false;
+
+ Expr *FramePtr =
+ buildBuiltinCall(S, Loc, Builtin::BI__builtin_coro_frame, {});
+
+ Expr *FrameSize =
+ buildBuiltinCall(S, Loc, Builtin::BI__builtin_coro_size, {});
+
+ // Make new call.
+
+ ExprResult NewRef =
+ S.BuildDeclRefExpr(OperatorNew, OperatorNew->getType(), VK_LValue, Loc);
+ if (NewRef.isInvalid())
+ return false;
+
+ ExprResult NewExpr =
+ S.ActOnCallExpr(S.getCurScope(), NewRef.get(), Loc, FrameSize, Loc);
+ if (NewExpr.isInvalid())
+ return false;
+
+ Allocation = NewExpr.get();
+
+ // Make delete call.
+
+ QualType OpDeleteQualType = OperatorDelete->getType();
+
+ ExprResult DeleteRef =
+ S.BuildDeclRefExpr(OperatorDelete, OpDeleteQualType, VK_LValue, Loc);
+ if (DeleteRef.isInvalid())
+ return false;
+
+ Expr *CoroFree =
+ buildBuiltinCall(S, Loc, Builtin::BI__builtin_coro_free, {FramePtr});
+
+ SmallVector<Expr *, 2> DeleteArgs{CoroFree};
+
+ // Check if we need to pass the size.
+ const auto *OpDeleteType =
+ OpDeleteQualType.getTypePtr()->getAs<FunctionProtoType>();
+ if (OpDeleteType->getNumParams() > 1)
+ DeleteArgs.push_back(FrameSize);
+
+ ExprResult DeleteExpr =
+ S.ActOnCallExpr(S.getCurScope(), DeleteRef.get(), Loc, DeleteArgs, Loc);
+ if (DeleteExpr.isInvalid())
+ return false;
+
+ Deallocation = DeleteExpr.get();
+
+ return true;
+}
+
void Sema::CheckCompletedCoroutineBody(FunctionDecl *FD, Stmt *&Body) {
FunctionScopeInfo *Fn = getCurFunction();
assert(Fn && !Fn->CoroutineStmts.empty() && "not a coroutine");
@@ -416,8 +543,8 @@ void Sema::CheckCompletedCoroutineBody(F
Diag(Fn->FirstReturnLoc, diag::err_return_in_coroutine);
auto *First = Fn->CoroutineStmts[0];
Diag(First->getLocStart(), diag::note_declared_coroutine_here)
- << (isa<CoawaitExpr>(First) ? 0 :
- isa<CoyieldExpr>(First) ? 1 : 2);
+ << (isa<CoawaitExpr>(First) ? 0 :
+ isa<CoyieldExpr>(First) ? 1 : 2);
}
bool AnyCoawaits = false;
@@ -460,7 +587,12 @@ void Sema::CheckCompletedCoroutineBody(F
if (FinalSuspend.isInvalid())
return FD->setInvalidDecl();
- // Try to form 'p.return_void();' expression statement to handle
+ // Form and check allocation and deallocation calls.
+ Expr *Allocation = nullptr;
+ Stmt *Deallocation = nullptr;
+ if (!buildAllocationAndDeallocation(*this, Loc, Fn, Allocation, Deallocation))
+ return FD->setInvalidDecl();
+
// control flowing off the end of the coroutine.
// Also try to form 'p.set_exception(std::current_exception());' to handle
// uncaught exceptions.
@@ -517,7 +649,7 @@ void Sema::CheckCompletedCoroutineBody(F
// Build implicit 'p.get_return_object()' expression and form initialization
// of return type from it.
ExprResult ReturnObject =
- buildPromiseCall(*this, Fn, Loc, "get_return_object", None);
+ buildPromiseCall(*this, Fn, Loc, "get_return_object", None);
if (ReturnObject.isInvalid())
return FD->setInvalidDecl();
QualType RetType = FD->getReturnType();
@@ -539,5 +671,6 @@ void Sema::CheckCompletedCoroutineBody(F
// Build body for the coroutine wrapper statement.
Body = new (Context) CoroutineBodyStmt(
Body, PromiseStmt.get(), InitialSuspend.get(), FinalSuspend.get(),
- SetException.get(), Fallthrough.get(), ReturnObject.get(), ParamMoves);
+ SetException.get(), Fallthrough.get(), Allocation, Deallocation,
+ ReturnObject.get(), ParamMoves);
}
Added: cfe/trunk/test/CodeGenCoroutines/coro-alloc.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGenCoroutines/coro-alloc.cpp?rev=285306&view=auto
==============================================================================
--- cfe/trunk/test/CodeGenCoroutines/coro-alloc.cpp (added)
+++ cfe/trunk/test/CodeGenCoroutines/coro-alloc.cpp Thu Oct 27 11:28:31 2016
@@ -0,0 +1,114 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fcoroutines-ts -std=c++14 -emit-llvm %s -o - -disable-llvm-passes | FileCheck %s
+
+namespace std {
+namespace experimental {
+template <typename... T>
+struct coroutine_traits; // expected-note {{declared here}}
+}
+}
+
+struct suspend_always {
+ bool await_ready() { return false; }
+ void await_suspend() {}
+ void await_resume() {}
+};
+
+struct global_new_delete_tag {};
+
+template<>
+struct std::experimental::coroutine_traits<void, global_new_delete_tag> {
+ struct promise_type {
+ void get_return_object() {}
+ suspend_always initial_suspend() { return {}; }
+ suspend_always final_suspend() { return {}; }
+ void return_void() {}
+ };
+};
+
+// CHECK-LABEL: f0(
+extern "C" void f0(global_new_delete_tag) {
+ // CHECK: %[[ID:.+]] = call token @llvm.coro.id(i32 16
+ // CHECK: %[[SIZE:.+]] = call i64 @llvm.coro.size.i64()
+ // CHECK: call i8* @_Znwm(i64 %[[SIZE]])
+
+ // CHECK: %[[FRAME:.+]] = call i8* @llvm.coro.frame()
+ // CHECK: %[[MEM:.+]] = call i8* @llvm.coro.free(token %[[ID]], i8* %[[FRAME]])
+ // CHECK: call void @_ZdlPv(i8* %[[MEM]])
+ co_await suspend_always{};
+}
+
+struct promise_new_tag {};
+
+template<>
+struct std::experimental::coroutine_traits<void, promise_new_tag> {
+ struct promise_type {
+ void *operator new(unsigned long);
+ void get_return_object() {}
+ suspend_always initial_suspend() { return {}; }
+ suspend_always final_suspend() { return {}; }
+ void return_void() {}
+ };
+};
+
+// CHECK-LABEL: f1(
+extern "C" void f1(promise_new_tag ) {
+ // CHECK: %[[ID:.+]] = call token @llvm.coro.id(i32 16
+ // CHECK: %[[SIZE:.+]] = call i64 @llvm.coro.size.i64()
+ // CHECK: call i8* @_ZNSt12experimental16coroutine_traitsIJv15promise_new_tagEE12promise_typenwEm(i64 %[[SIZE]])
+
+ // CHECK: %[[FRAME:.+]] = call i8* @llvm.coro.frame()
+ // CHECK: %[[MEM:.+]] = call i8* @llvm.coro.free(token %[[ID]], i8* %[[FRAME]])
+ // CHECK: call void @_ZdlPv(i8* %[[MEM]])
+ co_await suspend_always{};
+}
+
+struct promise_delete_tag {};
+
+template<>
+struct std::experimental::coroutine_traits<void, promise_delete_tag> {
+ struct promise_type {
+ void operator delete(void*);
+ void get_return_object() {}
+ suspend_always initial_suspend() { return {}; }
+ suspend_always final_suspend() { return {}; }
+ void return_void() {}
+ };
+};
+
+// CHECK-LABEL: f2(
+extern "C" void f2(promise_delete_tag) {
+ // CHECK: %[[ID:.+]] = call token @llvm.coro.id(i32 16
+ // CHECK: %[[SIZE:.+]] = call i64 @llvm.coro.size.i64()
+ // CHECK: call i8* @_Znwm(i64 %[[SIZE]])
+
+ // CHECK: %[[FRAME:.+]] = call i8* @llvm.coro.frame()
+ // CHECK: %[[MEM:.+]] = call i8* @llvm.coro.free(token %[[ID]], i8* %[[FRAME]])
+ // CHECK: call void @_ZNSt12experimental16coroutine_traitsIJv18promise_delete_tagEE12promise_typedlEPv(i8* %[[MEM]])
+ co_await suspend_always{};
+}
+
+struct promise_sized_delete_tag {};
+
+template<>
+struct std::experimental::coroutine_traits<void, promise_sized_delete_tag> {
+ struct promise_type {
+ void operator delete(void*, unsigned long);
+ void get_return_object() {}
+ suspend_always initial_suspend() { return {}; }
+ suspend_always final_suspend() { return {}; }
+ void return_void() {}
+ };
+};
+
+// CHECK-LABEL: f3(
+extern "C" void f3(promise_sized_delete_tag) {
+ // CHECK: %[[ID:.+]] = call token @llvm.coro.id(i32 16
+ // CHECK: %[[SIZE:.+]] = call i64 @llvm.coro.size.i64()
+ // CHECK: call i8* @_Znwm(i64 %[[SIZE]])
+
+ // CHECK: %[[FRAME:.+]] = call i8* @llvm.coro.frame()
+ // CHECK: %[[MEM:.+]] = call i8* @llvm.coro.free(token %[[ID]], i8* %[[FRAME]])
+ // CHECK: %[[SIZE2:.+]] = call i64 @llvm.coro.size.i64()
+ // CHECK: call void @_ZNSt12experimental16coroutine_traitsIJv24promise_sized_delete_tagEE12promise_typedlEPvm(i8* %[[MEM]], i64 %[[SIZE2]])
+ co_await suspend_always{};
+}
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