[PATCH] D56585: [clang-tidy] Treat references to smart pointers correctly in use-after-move.

[Martin Böhme via Phabricator via cfe-commits]

mboehme created this revision.
Herald added subscribers: cfe-commits, xazax.hun.

Previously, we weren't recognizing these as smart pointers and thus
weren't allowing non-dereference accesses as we should -- see new test
cases which fail without the fix.


Repository:
  rCTE Clang Tools Extra

https://reviews.llvm.org/D56585

Files:
  clang-tidy/bugprone/UseAfterMoveCheck.cpp
  test/clang-tidy/bugprone-use-after-move.cpp


Index: test/clang-tidy/bugprone-use-after-move.cpp
===================================================================
--- test/clang-tidy/bugprone-use-after-move.cpp
+++ test/clang-tidy/bugprone-use-after-move.cpp
@@ -244,6 +244,19 @@
     std::move(ptr);
     ptr.get();
   }
+  // Make sure we treat references to smart pointers correctly.
+  {
+    std::unique_ptr<A> ptr;
+    std::unique_ptr<A>& ref_to_ptr = ptr;
+    std::move(ref_to_ptr);
+    ref_to_ptr.get();
+  }
+  {
+    std::unique_ptr<A> ptr;
+    std::unique_ptr<A>&& rvalue_ref_to_ptr = std::move(ptr);
+    std::move(rvalue_ref_to_ptr);
+    rvalue_ref_to_ptr.get();
+  }
   // We don't give any special treatment to types that are called "unique_ptr"
   // or "shared_ptr" but are not in the "::std" namespace.
   {
@@ -257,6 +270,11 @@
   }
 }
 
+void foo(std::unique_ptr<A>&& a) {
+  std::move(a);
+  std::move(a);
+}
+
 // The check also works in member functions.
 class Container {
   void useAfterMoveInMemberFunction() {
Index: clang-tidy/bugprone/UseAfterMoveCheck.cpp
===================================================================
--- clang-tidy/bugprone/UseAfterMoveCheck.cpp
+++ clang-tidy/bugprone/UseAfterMoveCheck.cpp
@@ -207,7 +207,7 @@
 }
 
 bool isStandardSmartPointer(const ValueDecl *VD) {
-  const Type *TheType = VD->getType().getTypePtrOrNull();
+  const Type *TheType = VD->getType().getNonReferenceType().getTypePtrOrNull();
   if (!TheType)
     return false;
 



Index: test/clang-tidy/bugprone-use-after-move.cpp
===================================================================
--- test/clang-tidy/bugprone-use-after-move.cpp
+++ test/clang-tidy/bugprone-use-after-move.cpp
@@ -244,6 +244,19 @@
     std::move(ptr);
     ptr.get();
   }
+  // Make sure we treat references to smart pointers correctly.
+  {
+    std::unique_ptr<A> ptr;
+    std::unique_ptr<A>& ref_to_ptr = ptr;
+    std::move(ref_to_ptr);
+    ref_to_ptr.get();
+  }
+  {
+    std::unique_ptr<A> ptr;
+    std::unique_ptr<A>&& rvalue_ref_to_ptr = std::move(ptr);
+    std::move(rvalue_ref_to_ptr);
+    rvalue_ref_to_ptr.get();
+  }
   // We don't give any special treatment to types that are called "unique_ptr"
   // or "shared_ptr" but are not in the "::std" namespace.
   {
@@ -257,6 +270,11 @@
   }
 }
 
+void foo(std::unique_ptr<A>&& a) {
+  std::move(a);
+  std::move(a);
+}
+
 // The check also works in member functions.
 class Container {
   void useAfterMoveInMemberFunction() {
Index: clang-tidy/bugprone/UseAfterMoveCheck.cpp
===================================================================
--- clang-tidy/bugprone/UseAfterMoveCheck.cpp
+++ clang-tidy/bugprone/UseAfterMoveCheck.cpp
@@ -207,7 +207,7 @@
 }
 
 bool isStandardSmartPointer(const ValueDecl *VD) {
-  const Type *TheType = VD->getType().getTypePtrOrNull();
+  const Type *TheType = VD->getType().getNonReferenceType().getTypePtrOrNull();
   if (!TheType)
     return false;
 

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