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

[krasimir]

Summary

r346756 refined clang-format to not treat the [ in asm (...: [] ..) as an
ObjCExpr. However that's not enough, as we might have a comma-separated list of
such clobbers as in the newly added test.
This updates the detection to instead look at the Line's first token being asm
and not mark [-s as ObjCExprs in this case.

[djasper]

Does this also work for _asm and __asm?

[krasimir]

• Add tests for _asm etc

[krasimir]

In D54795#1305395, @djasper wrote:

Does this also work for _asm and __asm?

Thanks! Turns out, yes. I added tests for those.

lib/Format/TokenAnnotator.cpp

bool parseSquare() {
     bool CppArrayTemplates =
         Style.isCpp() && Parent && Parent->is(TT_TemplateCloser) &&
         (Contexts.back().CanBeExpression || Contexts.back().IsExpression ||
          Contexts.back().InTemplateArgument);
 
     bool IsCpp11AttributeSpecifier = isCpp11AttributeSpecifier(*Left) ||
                                      Contexts.back().InCpp11AttributeSpecifier;
 
+    bool InsideInlineASM = Line.startsWith(tok::kw_asm);
     bool StartsObjCMethodExpr =
-        !CppArrayTemplates && Style.isCpp() && !IsCpp11AttributeSpecifier &&
-        Contexts.back().CanBeExpression && Left->isNot(TT_LambdaLSquare) &&
+        !InsideInlineASM && !CppArrayTemplates && Style.isCpp() &&
+        !IsCpp11AttributeSpecifier && Contexts.back().CanBeExpression &&
+        Left->isNot(TT_LambdaLSquare) &&
         !CurrentToken->isOneOf(tok::l_brace, tok::r_square) &&
         (!Parent ||
-         (Parent->is(tok::colon) && Parent->isNot(TT_InlineASMColon)) ||
-         Parent->isOneOf(tok::l_square, tok::l_paren, tok::kw_return,
-                         tok::kw_throw) ||
+         Parent->isOneOf(tok::colon, 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

 
 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"
                                                "}"));
+  EXPECT_EQ(FormatStyle::LK_Cpp, guessLanguage("foo.h",
+                                               "void f() {\n"
+                                               "  asm (\"mov %[e], %[d]\"\n"
+                                               "     : [d] \"=rm\" (d),\n"
+                                               "       [e] \"rm\" (*e));\n"
+                                               "}"));
   EXPECT_EQ(FormatStyle::LK_Cpp,
             guessLanguage("foo.h", "void f() {\n"
                                    "  asm volatile (\"mov %[e], %[d]\"\n"
                                    "     : [d] \"=rm\" (d)\n"
                                    "       [e] \"rm\" (*e));\n"
                                    "}"));
 }