[clang] [clang-repl] Fix error recovery while PTU cleanup (PR #127467)

[Anutosh Bhat via cfe-commits]

https://github.com/anutosh491 updated https://github.com/llvm/llvm-project/pull/127467

>From 6ff448ed506e0ef75db2c9974a628a965e85df2f Mon Sep 17 00:00:00 2001
From: anutosh491 <andersonbhat491 at gmail.com>
Date: Mon, 17 Feb 2025 15:33:20 +0530
Subject: [PATCH 1/2] Fix error recovery while PTU cleanup

---
 clang/lib/Interpreter/IncrementalParser.cpp     | 4 ++--
 clang/unittests/Interpreter/InterpreterTest.cpp | 7 +++++++
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/clang/lib/Interpreter/IncrementalParser.cpp b/clang/lib/Interpreter/IncrementalParser.cpp
index e43cea1baf43a..1ebef0e434b3d 100644
--- a/clang/lib/Interpreter/IncrementalParser.cpp
+++ b/clang/lib/Interpreter/IncrementalParser.cpp
@@ -178,8 +178,8 @@ void IncrementalParser::CleanUpPTU(TranslationUnitDecl *MostRecentTU) {
     if (!ND)
       continue;
     // Check if we need to clean up the IdResolver chain.
-    if (ND->getDeclName().getFETokenInfo() && !D->getLangOpts().ObjC &&
-        !D->getLangOpts().CPlusPlus)
+    if (!ND->getDeclName().isEmpty() && ND->getDeclName().getFETokenInfo() &&
+        !D->getLangOpts().ObjC && !D->getLangOpts().CPlusPlus)
       S.IdResolver.RemoveDecl(ND);
   }
 }
diff --git a/clang/unittests/Interpreter/InterpreterTest.cpp b/clang/unittests/Interpreter/InterpreterTest.cpp
index 578f1d4c0eac6..56ab155ebf5a4 100644
--- a/clang/unittests/Interpreter/InterpreterTest.cpp
+++ b/clang/unittests/Interpreter/InterpreterTest.cpp
@@ -114,6 +114,13 @@ TEST_F(InterpreterTest, Errors) {
 
   RecoverErr = Interp->Parse("var1 = 424;");
   EXPECT_TRUE(!!RecoverErr);
+
+  Err = Interp->Parse("int x = 5; auto capture = [&]() { return x * 2; };").takeError();
+  EXPECT_THAT(DiagnosticOutput, HasSubstr("error: non-local lambda expression cannot have a capture-default"));
+  EXPECT_EQ("Parsing failed.", llvm::toString(std::move(Err)));
+
+  RecoverErr = Interp->Parse("int validVar = 10;");
+  EXPECT_TRUE(!!RecoverErr);
 }
 
 // Here we test whether the user can mix declarations and statements. The

>From 8b9a112721c45662374fd9995af6da4031507c89 Mon Sep 17 00:00:00 2001
From: Anutosh Bhat <andersonbhat491 at gmail.com>
Date: Wed, 26 Feb 2025 16:55:31 +0530
Subject: [PATCH 2/2] Update IncrementalParser.cpp

---
 clang/lib/Interpreter/IncrementalParser.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/clang/lib/Interpreter/IncrementalParser.cpp b/clang/lib/Interpreter/IncrementalParser.cpp
index 1ebef0e434b3d..774219d9fc9ab 100644
--- a/clang/lib/Interpreter/IncrementalParser.cpp
+++ b/clang/lib/Interpreter/IncrementalParser.cpp
@@ -175,11 +175,11 @@ void IncrementalParser::CleanUpPTU(TranslationUnitDecl *MostRecentTU) {
   // FIXME: We should de-allocate MostRecentTU
   for (Decl *D : MostRecentTU->decls()) {
     auto *ND = dyn_cast<NamedDecl>(D);
-    if (!ND)
+    if (!ND || ND->getDeclName().isEmpty()) 
       continue;
     // Check if we need to clean up the IdResolver chain.
-    if (!ND->getDeclName().isEmpty() && ND->getDeclName().getFETokenInfo() &&
-        !D->getLangOpts().ObjC && !D->getLangOpts().CPlusPlus)
+    if (ND->getDeclName().getFETokenInfo() && !D->getLangOpts().ObjC &&
+        !D->getLangOpts().CPlusPlus)
       S.IdResolver.RemoveDecl(ND);
   }
 }