[PATCH] D82284: [AST][RecoveryAST] Preseve invalid return stmt, and suppress the diagnostics for missing return stmt in constexpr func.

[Haojian Wu via Phabricator via cfe-commits]

hokein updated this revision to Diff 307980.
hokein added a comment.

rebase and update


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D82284/new/

https://reviews.llvm.org/D82284

Files:
  clang/lib/Sema/SemaStmt.cpp
  clang/test/SemaCXX/constant-expression-cxx11.cpp
  clang/test/SemaCXX/typo-correction-crash.cpp


Index: clang/test/SemaCXX/typo-correction-crash.cpp
===================================================================
--- clang/test/SemaCXX/typo-correction-crash.cpp
+++ clang/test/SemaCXX/typo-correction-crash.cpp
@@ -16,7 +16,8 @@
 
 auto L1 = [] { return s; }; // expected-error {{use of undeclared identifier 's'}}
 using T1 = decltype(L1());
-static_assert(is_same<T1, void>::value, "Return statement should be discarded");
+// FIXME: Suppress the 'undeclared identifier T1' diagnostic, the UsingDecl T1 is discarded because of an invalid L1().
+static_assert(is_same<T1, void>::value, "Return statement should be discarded"); // expected-error {{use of undeclared identifier 'T1'}}
 auto L2 = [] { return tes; }; // expected-error {{use of undeclared identifier 'tes'; did you mean 'test'?}}
 using T2 = decltype(L2());
 static_assert(is_same<T2, int>::value, "Return statement was corrected");
Index: clang/test/SemaCXX/constant-expression-cxx11.cpp
===================================================================
--- clang/test/SemaCXX/constant-expression-cxx11.cpp
+++ clang/test/SemaCXX/constant-expression-cxx11.cpp
@@ -1807,11 +1807,10 @@
 }
 
 namespace AfterError {
-  // FIXME: Suppress the 'no return statements' diagnostic if the body is invalid.
-  constexpr int error() { // expected-error {{no return statement}}
+  constexpr int error() {
     return foobar; // expected-error {{undeclared identifier}}
   }
-  constexpr int k = error();
+  constexpr int k = error(); // expected-error {{constexpr variable 'k' must be initialized by a constant expression}}
 }
 
 namespace std {
Index: clang/lib/Sema/SemaStmt.cpp
===================================================================
--- clang/lib/Sema/SemaStmt.cpp
+++ clang/lib/Sema/SemaStmt.cpp
@@ -3626,7 +3626,8 @@
                       Scope *CurScope) {
   // Correct typos, in case the containing function returns 'auto' and
   // RetValExp should determine the deduced type.
-  ExprResult RetVal = CorrectDelayedTyposInExpr(RetValExp);
+  ExprResult RetVal = CorrectDelayedTyposInExpr(
+      RetValExp, nullptr, /*RecoverUncorrectedTypos=*/true);
   if (RetVal.isInvalid())
     return StmtError();
   StmtResult R = BuildReturnStmt(ReturnLoc, RetVal.get());


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