[PATCH] D72497: [CodeComplete] Suggest 'return nullptr' in functions returning pointers

[Ilya Biryukov via Phabricator via cfe-commits]

ilya-biryukov created this revision.
ilya-biryukov added a reviewer: kadircet.
Herald added a project: clang.

Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D72497

Files:
  clang/lib/Sema/SemaCodeComplete.cpp
  clang/test/CodeCompletion/patterns.cpp


Index: clang/test/CodeCompletion/patterns.cpp
===================================================================
--- clang/test/CodeCompletion/patterns.cpp
+++ clang/test/CodeCompletion/patterns.cpp
@@ -33,20 +33,44 @@
 bool bool_return() {
   // line 34
 }
+int *ptr_return() {
+  // line 37
+}
+struct Cls {};
+int Cls::*memptr_return() {
+  // line 41
+}
 // RUN: %clang_cc1 -fsyntax-only -code-completion-patterns -code-completion-at=%s:28:1 %s -o - | FileCheck -check-prefix=RETURN-VAL %s
 // RETURN-VAL-NOT: COMPLETION: Pattern : return;
 // RETURN-VAL-NOT: COMPLETION: Pattern : return false;
 // RETURN-VAL-NOT: COMPLETION: Pattern : return true;
+// RETURN-VAL-NOT: COMPLETION: Pattern : return nullptr;
 // RETURN-VAL: COMPLETION: Pattern : return <#expression#>;{{$}}
 
 // RUN: %clang_cc1 -fsyntax-only -code-completion-patterns -code-completion-at=%s:31:1 %s -o - | FileCheck -check-prefix=RETURN-VOID %s
 // RETURN-VOID-NOT: COMPLETION: Pattern : return false;
 // RETURN-VOID-NOT: COMPLETION: Pattern : return true;
 // RETURN-VOID-NOT: COMPLETION: Pattern : return <#expression#>;
+// RETURN-VOID-NOT: COMPLETION: Pattern : return nullptr;
 // RETURN-VOID: COMPLETION: Pattern : return;{{$}}
 
 // RUN: %clang_cc1 -fsyntax-only -code-completion-patterns -code-completion-at=%s:34:1 %s -o - | FileCheck -check-prefix=RETURN-BOOL %s
 // RETURN-BOOL-NOT: COMPLETION: Pattern : return;
+// RETURN-BOOL-NOT: COMPLETION: Pattern : return nullptr;
 // RETURN-BOOL: COMPLETION: Pattern : return <#expression#>;{{$}}
 // RETURN-BOOL: COMPLETION: Pattern : return false;{{$}}
 // RETURN-BOOL: COMPLETION: Pattern : return true;{{$}}
+
+// Check both pointer and member pointer return types.
+// RUN: %clang_cc1 -fsyntax-only -std=c++11 -code-completion-patterns -code-completion-at=%s:37:1 %s -o - | FileCheck -check-prefix=RETURN-PTR %s
+// RUN: %clang_cc1 -fsyntax-only -std=c++11 -code-completion-patterns -code-completion-at=%s:41:1 %s -o - | FileCheck -check-prefix=RETURN-PTR %s
+// RETURN-PTR-NOT: COMPLETION: Pattern : return false;{{$}}
+// RETURN-PTR-NOT: COMPLETION: Pattern : return true;{{$}}
+// RETURN-PTR-NOT: COMPLETION: Pattern : return;
+// RETURN-PTR: COMPLETION: Pattern : return <#expression#>;{{$}}
+// RETURN-PTR: COMPLETION: Pattern : return nullptr;
+
+// 'return nullptr' is not available before C++11.
+// RUN: %clang_cc1 -fsyntax-only -std=c++03 -code-completion-patterns -code-completion-at=%s:37:1 %s -o - | FileCheck -check-prefix=RETURN-PTR-STD03 %s
+// RUN: %clang_cc1 -fsyntax-only -std=c++03 -code-completion-patterns -code-completion-at=%s:41:1 %s -o - | FileCheck -check-prefix=RETURN-PTR-STD03 %s
+// RETURN-PTR-STD03-NOT: COMPLETION: Pattern : return nullptr;
Index: clang/lib/Sema/SemaCodeComplete.cpp
===================================================================
--- clang/lib/Sema/SemaCodeComplete.cpp
+++ clang/lib/Sema/SemaCodeComplete.cpp
@@ -2312,6 +2312,13 @@
         Builder.AddChunk(CodeCompletionString::CK_SemiColon);
         Results.AddResult(Result(Builder.TakeString()));
       }
+      // For pointers, suggest 'return nullptr' in C++.
+      if (SemaRef.getLangOpts().CPlusPlus11 &&
+          (ReturnType->isPointerType() || ReturnType->isMemberPointerType())) {
+        Builder.AddTypedTextChunk("return nullptr");
+        Builder.AddChunk(CodeCompletionString::CK_SemiColon);
+        Results.AddResult(Result(Builder.TakeString()));
+      }
     }
 
     // goto identifier ;


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