[clang-format] fix regression recognizing casts in Obj-C calls

Summary:
r373922 added checks for a few tokens that, following an `)` make it
unlikely that the `)` is the closing paren of a cast expression. The
specific check for `tok::l_square` there introduced a regression for
casts of Obj-C calls, like:
```
(cast)[func arg]
```
From the tests added in r373922, I believe the `tok::l_square` case is added to
capture the case where a non-cast `)` is directly followed by an
attribute specifier, like:
```
int f(int x) [[noreturn]];
```

I've specialized the code to look for such attribute specifier instead
of `tok::l_square` in general. Also, I added a regression test and moved
the test cases added in r373922 to an already existing place documenting
other instances of historically misidentified casts.

Reviewers: MyDeveloperDay

Reviewed By: MyDeveloperDay

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D69164

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@375247 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Format/TokenAnnotator.cpp

@@ -1607,8 +1607,9 @@ private:
     // Functions which end with decorations like volatile, noexcept are unlikely
     // to be casts.
     if (Tok.Next->isOneOf(tok::kw_noexcept, tok::kw_volatile, tok::kw_const,
-                          tok::kw_throw, tok::l_square, tok::arrow,
-                          Keywords.kw_override, Keywords.kw_final))
+                          tok::kw_throw, tok::arrow, Keywords.kw_override,
+                          Keywords.kw_final) ||
+        isCpp11AttributeSpecifier(*Tok.Next))
       return false;
 
     // As Java has no function types, a "(" after the ")" likely means that this

unittests/Format/FormatTest.cpp

@@ -7541,6 +7541,8 @@ TEST_F(FormatTest, FormatsCasts) {
   verifyFormat("my_int a = (ns::my_int)-2;");
   verifyFormat("case (my_int)ONE:");
   verifyFormat("auto x = (X)this;");
+  // Casts in Obj-C style calls used to not be recognized as such.
+  verifyFormat("int a = [(type*)[((type*)val) arg] arg];", getGoogleStyle());
 
   // FIXME: single value wrapped with paren will be treated as cast.
   verifyFormat("void f(int i = (kValue)*kMask) {}");
@@ -7581,6 +7583,29 @@ TEST_F(FormatTest, FormatsCasts) {
   verifyFormat("int a = alignof(int *) + b;", getGoogleStyle());
   verifyFormat("bool b = f(g<int>) && c;");
   verifyFormat("typedef void (*f)(int i) func;");
+  verifyFormat("void operator++(int) noexcept;");
+  verifyFormat("void operator++(int &) noexcept;");
+  verifyFormat("void operator delete(void *, std::size_t, const std::nothrow_t "
+               "&) noexcept;");
+  verifyFormat(
+      "void operator delete(std::size_t, const std::nothrow_t &) noexcept;");
+  verifyFormat("void operator delete(const std::nothrow_t &) noexcept;");
+  verifyFormat("void operator delete(std::nothrow_t &) noexcept;");
+  verifyFormat("void operator delete(nothrow_t &) noexcept;");
+  verifyFormat("void operator delete(foo &) noexcept;");
+  verifyFormat("void operator delete(foo) noexcept;");
+  verifyFormat("void operator delete(int) noexcept;");
+  verifyFormat("void operator delete(int &) noexcept;");
+  verifyFormat("void operator delete(int &) volatile noexcept;");
+  verifyFormat("void operator delete(int &) const");
+  verifyFormat("void operator delete(int &) = default");
+  verifyFormat("void operator delete(int &) = delete");
+  verifyFormat("void operator delete(int &) [[noreturn]]");
+  verifyFormat("void operator delete(int &) throw();");
+  verifyFormat("void operator delete(int &) throw(int);");
+  verifyFormat("auto operator delete(int &) -> int;");
+  verifyFormat("auto operator delete(int &) override");
+  verifyFormat("auto operator delete(int &) final");
 
   verifyFormat("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa *foo = (aaaaaaaaaaaaaaaaa *)\n"
                "    bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb;");
@@ -14696,33 +14721,6 @@ TEST_F(FormatTest, AlternativeOperators) {
   */
 }
 
-TEST_F(FormatTest, NotCastRPaen) {
-
-  verifyFormat("void operator++(int) noexcept;");
-  verifyFormat("void operator++(int &) noexcept;");
-  verifyFormat("void operator delete(void *, std::size_t, const std::nothrow_t "
-               "&) noexcept;");
-  verifyFormat(
-      "void operator delete(std::size_t, const std::nothrow_t &) noexcept;");
-  verifyFormat("void operator delete(const std::nothrow_t &) noexcept;");
-  verifyFormat("void operator delete(std::nothrow_t &) noexcept;");
-  verifyFormat("void operator delete(nothrow_t &) noexcept;");
-  verifyFormat("void operator delete(foo &) noexcept;");
-  verifyFormat("void operator delete(foo) noexcept;");
-  verifyFormat("void operator delete(int) noexcept;");
-  verifyFormat("void operator delete(int &) noexcept;");
-  verifyFormat("void operator delete(int &) volatile noexcept;");
-  verifyFormat("void operator delete(int &) const");
-  verifyFormat("void operator delete(int &) = default");
-  verifyFormat("void operator delete(int &) = delete");
-  verifyFormat("void operator delete(int &) [[noreturn]]");
-  verifyFormat("void operator delete(int &) throw();");
-  verifyFormat("void operator delete(int &) throw(int);");
-  verifyFormat("auto operator delete(int &) -> int;");
-  verifyFormat("auto operator delete(int &) override");
-  verifyFormat("auto operator delete(int &) final");
-}
-
 TEST_F(FormatTest, STLWhileNotDefineChed) {
   verifyFormat("#if defined(while)\n"
                "#define while EMIT WARNING C4005\n"