[clang-format] Do not treat the asm clobber [ as ObjCExpr

[krasimir]

Summary

The opening square of an inline asm clobber was being annotated as an ObjCExpr.
This caused, amongst other things, the ObjCGuesser to guess header files
containing that pattern as ObjC files.

[krasimir]

• Clean-up

[benhamilton]

In the diff description, please fix the typo: Do not threat the asm clobber -> Do not treat the asm clobber

unittests/Format/FormatTest.cpp

12756–12763

Worth a second test with asm volatile (...) ?

[krasimir]

• Address review comments

lib/Format/TokenAnnotator.cpp

bool parseSquare() {
     bool IsCpp11AttributeSpecifier = isCpp11AttributeSpecifier(*Left) ||
                                      Contexts.back().InCpp11AttributeSpecifier;
 
     bool StartsObjCMethodExpr =
         !CppArrayTemplates && Style.isCpp() && !IsCpp11AttributeSpecifier &&
         Contexts.back().CanBeExpression && Left->isNot(TT_LambdaLSquare) &&
         !CurrentToken->isOneOf(tok::l_brace, tok::r_square) &&
         (!Parent ||
-         Parent->isOneOf(tok::colon, tok::l_square, tok::l_paren,
-                         tok::kw_return, tok::kw_throw) ||
+         (Parent->is(tok::colon) && Parent->isNot(TT_InlineASMColon)) ||
+         Parent->isOneOf(tok::l_square, tok::l_paren, tok::kw_return,
+                         tok::kw_throw) ||
          Parent->isUnaryOperator() ||
          // FIXME(bug 36976): ObjC return types shouldn't use TT_CastRParen.
          Parent->isOneOf(TT_ObjCForIn, TT_CastRParen) ||
          getBinOpPrecedence(Parent->Tok.getKind(), true, true) > prec::Unknown);
     bool ColonFound = false;
 
     unsigned BindingIncrease = 1;
     if (Left->isCppStructuredBinding(Style)) {

unittests/Format/FormatTest.cpp

EXPECT_EQ(FormatStyle::LK_ObjC,
             guessLanguage("foo.h", "int(^foo[10])(char, float);"));
   EXPECT_EQ(FormatStyle::LK_ObjC,
             guessLanguage("foo.h", "int(^foo[kNumEntries])(char, float);"));
   EXPECT_EQ(
       FormatStyle::LK_ObjC,
       guessLanguage("foo.h", "int(^foo[(kNumEntries + 10)])(char, float);"));
 }
 
+TEST_F(FormatTest, GuessedLanguageWithInlineAsmClobbers) {
+  EXPECT_EQ(FormatStyle::LK_Cpp, guessLanguage("foo.h",
+                                               "void f() {\n"
+                                               "  asm (\"mov %[e], %[d]\"\n"
+                                               "     : [d] \"=rm\" (d)\n"
+                                               "       [e] \"rm\" (*e));\n"
+                                               "}"));
+}
+
 TEST_F(FormatTest, GuessLanguageWithChildLines) {
   EXPECT_EQ(FormatStyle::LK_Cpp,
             guessLanguage("foo.h", "#define FOO ({ std::string s; })"));
   EXPECT_EQ(FormatStyle::LK_ObjC,
             guessLanguage("foo.h", "#define FOO ({ NSString *s; })"));
   EXPECT_EQ(
       FormatStyle::LK_Cpp,
       guessLanguage("foo.h", "#define FOO ({ foo(); ({ std::string s; }) })"));
   EXPECT_EQ(
       FormatStyle::LK_ObjC,
       guessLanguage("foo.h", "#define FOO ({ foo(); ({ NSString *s; }) })"));
 }
 
 } // end namespace
 } // end namespace format
 } // end namespace clang