[clang-tidy] check for __func__/__FUNCTION__ in lambdas

Add a clang-tidy check for using func__/FUNCTION__ inside lambdas. This
evaluates to the string operator(), which is almost never useful and almost
certainly not what the author intended.

Patch by Bryce Liu!

Differential Revision: https://reviews.llvm.org/D33497

llvm-svn: 304570

1 files changed, 27 insertions, 0 deletions

diff --git a/clang-tools-extra/docs/clang-tidy/checks/misc-lambda-function-name.rst b/clang-tools-extra/docs/clang-tidy/checks/misc-lambda-function-name.rst
new file mode 100644
index 00000000000..1ab584c1411
--- /dev/null
+++ b/clang-tools-extra/docs/clang-tidy/checks/misc-lambda-function-name.rst
@@ -0,0 +1,27 @@
+.. title:: clang-tidy - misc-lambda-function-name
+
+misc-lambda-function-name
+=========================
+
+Checks for attempts to get the name of a function from within a lambda
+expression. The name of a lambda is always something like ``operator()``, which
+is almost never what was intended.
+
+Example:
+
+.. code-block:: c++
+								
+  void FancyFunction() {
+    [] { printf("Called from %s\n", __func__); }();
+    [] { printf("Now called from %s\n", __FUNCTION__); }();
+  }
+
+Output::
+
+  Called from operator()
+  Now called from operator()
+
+Likely intended output::
+
+  Called from FancyFunction
+  Now called from FancyFunction