[clang] [Clang] Implement P2718R0 "Lifetime extension in range-based for loops" (PR #76361)
Hubert Tong via cfe-commits
cfe-commits at lists.llvm.org
Mon Mar 18 01:37:30 PDT 2024
================
@@ -6375,12 +6383,16 @@ ExprResult Sema::BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field) {
ImmediateCallVisitor V(getASTContext());
if (!NestedDefaultChecking)
V.TraverseDecl(Field);
- if (V.HasImmediateCalls) {
+ if (V.HasImmediateCalls || InLifetimeExtendingContext) {
ExprEvalContexts.back().DelayedDefaultInitializationContext = {Loc, Field,
CurContext};
ExprEvalContexts.back().IsCurrentlyCheckingDefaultArgumentOrInitializer =
NestedDefaultChecking;
+ // Pass down lifetime extending flag, and collect temporaries in
+ // CreateMaterializeTemporaryExpr when we rewrite the call argument.
+ keepInLifetimeExtendingContext();
+ keepInMaterializeTemporaryObjectContext();
----------------
hubert-reinterpretcast wrote:
> @hubert-reinterpretcast Could you please give me an example where `CXXDefaultInitExpr` has to be lifetime-extended?
https://github.com/llvm/llvm-project/issues/85613
https://github.com/llvm/llvm-project/pull/76361
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