[PATCH] D30569: [clang-tidy] misc-use-after-move: Fix failing assertion

[Martin Böhme via Phabricator via cfe-commits]

mboehme created this revision.
Herald added a subscriber: JDevlieghere.

I've added a test case that (without the fix) triggers the assertion,
which happens when a move happens in an implicitly called conversion
operator.


https://reviews.llvm.org/D30569

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


Index: test/clang-tidy/misc-use-after-move.cpp
===================================================================
--- test/clang-tidy/misc-use-after-move.cpp
+++ test/clang-tidy/misc-use-after-move.cpp
@@ -282,7 +282,7 @@
   S s{std::move(a)};
   a.foo();
   // CHECK-MESSAGES: [[@LINE-1]]:3: warning: 'a' used after it was moved
-  // CHECK-MESSAGES: [[@LINE-3]]:6: note: move occurred here
+  // CHECK-MESSAGES: [[@LINE-3]]:7: note: move occurred here
 }
 
 void lambdas() {
@@ -397,6 +397,21 @@
 }
 template void movedTypeIsDependentType<A>();
 
+// We handle the case correctly where the move consists of an implicit call
+// to a conversion operator.
+void implicitConversionOperator() {
+  struct Convertible {
+    operator A() && { return A(); }
+  };
+  void takeA(A a);
+
+  Convertible convertible;
+  takeA(std::move(convertible));
+  convertible;
+  // CHECK-MESSAGES: [[@LINE-1]]:3: warning: 'convertible' used after it was moved
+  // CHECK-MESSAGES: [[@LINE-3]]:9: note: move occurred here
+}
+
 // Using decltype on an expression is not a use.
 void decltypeIsNotUse() {
   A a;
Index: clang-tidy/misc/UseAfterMoveCheck.cpp
===================================================================
--- clang-tidy/misc/UseAfterMoveCheck.cpp
+++ clang-tidy/misc/UseAfterMoveCheck.cpp
@@ -398,7 +398,7 @@
   const auto *MovingCall = Result.Nodes.getNodeAs<Expr>("moving-call");
   const auto *Arg = Result.Nodes.getNodeAs<DeclRefExpr>("arg");
 
-  if (!MovingCall)
+  if (!MovingCall || !MovingCall->getExprLoc().isValid())
     MovingCall = CallMove;
 
   Stmt *FunctionBody = nullptr;


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