[clang-tidy] Adding Fuchsia checker for overloaded operators

Adds a check to the Fuchsia module to warn if an operator is overloaded,
except move and copy operators.

See https://fuchsia.googlesource.com/zircon/+/master/docs/cxx.md for
reference.

Differential Revision: https://reviews.llvm.org/D41363

llvm-svn: 321363

1 files changed, 18 insertions, 0 deletions

diff --git a/clang-tools-extra/test/clang-tidy/fuchsia-overloaded-operator.cpp b/clang-tools-extra/test/clang-tidy/fuchsia-overloaded-operator.cpp
new file mode 100644
index 00000000000..5c65c5bfa11
--- /dev/null
+++ b/clang-tools-extra/test/clang-tidy/fuchsia-overloaded-operator.cpp
@@ -0,0 +1,18 @@
+// RUN: %check_clang_tidy %s fuchsia-overloaded-operator %t
+
+class A {
+public:
+  int operator+(int);
+  // CHECK-MESSAGES: [[@LINE-1]]:3: warning: cannot overload 'operator+' [fuchsia-overloaded-operator]
+};
+
+class B {
+public:
+  B &operator=(const B &Other);
+  // CHECK-MESSAGES-NOT: [[@LINE-1]]:3: warning: cannot overload 'operator=' [fuchsia-overloaded-operator]
+  B &operator=(B &&Other);
+  // CHECK-MESSAGES-NOT: [[@LINE-1]]:3: warning: cannot overload 'operator=' [fuchsia-overloaded-operator]
+};
+
+A operator-(const A& AA, const A& BB);
+// CHECK-MESSAGES: [[@LINE-1]]:1: warning: cannot overload 'operator-' [fuchsia-overloaded-operator]