Sema: Use ForeignLanguage directly in diagnostic definitions

Author: xymus

include/swift/AST/DiagnosticsCommon.h

@@ -48,6 +48,7 @@ namespace swift {
   } // end namespace detail
 
   enum class StaticSpellingKind : uint8_t;
+  enum class ForeignLanguage : uint8_t;
 
   namespace diag {
 

include/swift/AST/DiagnosticsSema.def

@@ -6607,19 +6607,19 @@ ERROR(objc_invalid_on_func_variadic,none,
 ERROR(objc_invalid_on_func_inout,none,
       "%kindonly0 cannot be %" OBJC_ATTR_SELECT "1 because inout "
       "parameters cannot be represented in %" FOREIGN_LANG_SELECT "2",
-      (const AbstractFunctionDecl*, unsigned, unsigned))
+      (const AbstractFunctionDecl*, unsigned, ForeignLanguage))
 ERROR(objc_invalid_on_func_param_type,none,
       "%kindonly0 cannot be %" OBJC_ATTR_SELECT "2 because the type of the "
       "parameter %1 cannot be represented in %" FOREIGN_LANG_SELECT "3",
-      (const AbstractFunctionDecl*, unsigned, unsigned, unsigned))
+      (const AbstractFunctionDecl*, unsigned, unsigned, ForeignLanguage))
 ERROR(objc_invalid_on_func_single_param_type,none,
       "%kindonly0 cannot be %" OBJC_ATTR_SELECT "1 because the type of the "
       "parameter cannot be represented in %" FOREIGN_LANG_SELECT "2",
-      (const AbstractFunctionDecl*, unsigned, unsigned))
+      (const AbstractFunctionDecl*, unsigned, ForeignLanguage))
 ERROR(objc_invalid_on_func_result_type,none,
       "%kindonly0 cannot be %" OBJC_ATTR_SELECT "1 because its result type "
       "cannot be represented in %" FOREIGN_LANG_SELECT "2",
-      (const AbstractFunctionDecl*, unsigned, unsigned))
+      (const AbstractFunctionDecl*, unsigned, ForeignLanguage))
 ERROR(objc_invalid_on_foreign_class,none,
       "method cannot be %" OBJC_ATTR_SELECT "0 because Core Foundation "
       "types are not classes in Objective-C", (unsigned))

include/swift/AST/Type.h

@@ -161,7 +161,7 @@ inline SubstOptions operator|(SubstFlags lhs, SubstFlags rhs) {
 
 /// Enumeration describing foreign languages to which Swift may be
 /// bridged.
-enum class ForeignLanguage {
+enum class ForeignLanguage : uint8_t {
   C,
   ObjectiveC,
 };

lib/Sema/TypeCheckDeclObjC.cpp

@@ -304,13 +304,13 @@ static void diagnoseFunctionParamNotRepresentable(
     softenIfAccessNote(AFD, Reason.getAttr(),
       AFD->diagnose(diag::objc_invalid_on_func_single_param_type,
                     AFD, getObjCDiagnosticAttrKind(Reason),
-                    (unsigned)language)
+                    language)
           .limitBehavior(behavior));
   } else {
     softenIfAccessNote(AFD, Reason.getAttr(),
       AFD->diagnose(diag::objc_invalid_on_func_param_type,
                     AFD, ParamIndex + 1, getObjCDiagnosticAttrKind(Reason),
-                    (unsigned)language)
+                    language)
           .limitBehavior(behavior));
   }
   SourceRange SR;
@@ -357,7 +357,7 @@ static bool isParamListRepresentableInLanguage(const AbstractFunctionDecl *AFD,
       softenIfAccessNote(AFD, Reason.getAttr(),
         diags.diagnose(param->getStartLoc(), diag::objc_invalid_on_func_inout,
                        AFD, getObjCDiagnosticAttrKind(Reason),
-                       (unsigned)language)
+                       language)
           .highlight(param->getSourceRange())
           .limitBehavior(behavior));
       Reason.describe(AFD);
@@ -801,7 +801,7 @@ bool swift::isRepresentableInLanguage(
       softenIfAccessNote(AFD, Reason.getAttr(),
        AFD->diagnose(diag::objc_invalid_on_func_result_type,
                      FD, getObjCDiagnosticAttrKind(Reason),
-                     (unsigned)language)
+                     language)
             .limitBehavior(behavior));
       diagnoseTypeNotRepresentableInObjC(FD, ResultType,
                                          FD->getResultTypeSourceRange(),
@@ -858,7 +858,7 @@ bool swift::isRepresentableInLanguage(
         softenIfAccessNote(AFD, Reason.getAttr(),
           AFD->diagnose(diag::objc_invalid_on_func_result_type,
                         FD, getObjCDiagnosticAttrKind(Reason),
-                        (unsigned)language)
+                        language)
               .limitBehavior(behavior));
         diagnoseTypeNotRepresentableInObjC(FD, type,
                                            FD->getResultTypeSourceRange(),