================
@@ -338,6 +386,85 @@ static QualType getCoroutineSuspendExprReturnType(const
ASTContext &Ctx,
}
#endif
+llvm::Function *CodeGenFunction::generateAwaitSuspendHelper(
+ Twine const &CoroName, Twine const &SuspendPointName,
+ CoroutineSuspendExpr const &S, bool CanThrow) {
+ std::string FuncName = "__await_suspend_helper_";
+ FuncName += CoroName.str();
+ FuncName += '_';
+ FuncName += SuspendPointName.str();
+
+ ASTContext &C = getContext();
+
+ FunctionArgList args;
+
+ ImplicitParamDecl AwaiterDecl(C, C.VoidPtrTy, ImplicitParamKind::Other);
+ ImplicitParamDecl FrameDecl(C, C.VoidPtrTy, ImplicitParamKind::Other);
+ QualType ReturnTy = S.getSuspendExpr()->getType();
+
+ if (ReturnTy->isBooleanType()) {
+ ReturnTy = C.BoolTy;
+ } else if (ReturnTy->isVoidPointerType()) {
+ ReturnTy = C.VoidPtrTy;
+ } else {
+ ReturnTy = C.VoidTy;
+ }
+
+ args.push_back(&AwaiterDecl);
+ args.push_back(&FrameDecl);
+
+ const CGFunctionInfo &FI =
+ CGM.getTypes().arrangeBuiltinFunctionDeclaration(ReturnTy, args);
+
+ llvm::FunctionType *LTy = CGM.getTypes().GetFunctionType(FI);
+
+ llvm::Function *Fn = llvm::Function::Create(
+ LTy, llvm::GlobalValue::PrivateLinkage, FuncName, &CGM.getModule());
+
+ Fn->addParamAttr(0, llvm::Attribute::AttrKind::NonNull);
+ Fn->addParamAttr(0, llvm::Attribute::AttrKind::NoUndef);
+
+ Fn->addParamAttr(1, llvm::Attribute::AttrKind::NoUndef);
+
+ Fn->setMustProgress();
+ Fn->addFnAttr(llvm::Attribute::AttrKind::AlwaysInline);
+
+ if (!CanThrow) {
+ Fn->addFnAttr(llvm::Attribute::AttrKind::NoUnwind);
+ }
----------------
ChuanqiXu9 wrote:
We don't need this. If I remember correctly, LLVM can add it automatically as
long as the await_suspend is marked noexcept.
https://github.com/llvm/llvm-project/pull/79712
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