Refactor diagnostics for MS attributes without -fms-extensions

This shares the warn_attribute_unused diagnostic and reduces the
indentation level.  No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@182096 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaDeclAttr.cpp

@@ -4576,66 +4576,74 @@ static void handleObjCPreciseLifetimeAttr(Sema &S, Decl *D,
 // Microsoft specific attribute handlers.
 //===----------------------------------------------------------------------===//
 
+// Check if MS extensions or some other language extensions are enabled.  If
+// not, issue a diagnostic that the given attribute is unused.
+static bool checkMicrosoftExt(Sema &S, const AttributeList &Attr,
+                              bool OtherExtension = false) {
+  if (S.LangOpts.MicrosoftExt || OtherExtension)
+    return true;
+  S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
+  return false;
+}
+
 static void handleUuidAttr(Sema &S, Decl *D, const AttributeList &Attr) {
-  if (S.LangOpts.MicrosoftExt || S.LangOpts.Borland) {
-    // check the attribute arguments.
-    if (!checkAttributeNumArgs(S, Attr, 1))
-      return;
+  if (!checkMicrosoftExt(S, Attr, S.LangOpts.Borland))
+    return;
 
-    Expr *Arg = Attr.getArg(0);
-    StringLiteral *Str = dyn_cast<StringLiteral>(Arg);
-    if (!Str || !Str->isAscii()) {
-      S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string)
-        << "uuid" << 1;
-      return;
-    }
+  // check the attribute arguments.
+  if (!checkAttributeNumArgs(S, Attr, 1))
+    return;
 
-    StringRef StrRef = Str->getString();
+  Expr *Arg = Attr.getArg(0);
+  StringLiteral *Str = dyn_cast<StringLiteral>(Arg);
+  if (!Str || !Str->isAscii()) {
+    S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string)
+      << "uuid" << 1;
+    return;
+  }
 
-    bool IsCurly = StrRef.size() > 1 && StrRef.front() == '{' &&
-                   StrRef.back() == '}';
+  StringRef StrRef = Str->getString();
 
-    // Validate GUID length.
-    if (IsCurly && StrRef.size() != 38) {
-      S.Diag(Attr.getLoc(), diag::err_attribute_uuid_malformed_guid);
-      return;
-    }
-    if (!IsCurly && StrRef.size() != 36) {
-      S.Diag(Attr.getLoc(), diag::err_attribute_uuid_malformed_guid);
-      return;
-    }
+  bool IsCurly = StrRef.size() > 1 && StrRef.front() == '{' &&
+                 StrRef.back() == '}';
 
-    // GUID format is "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX" or
-    // "{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}"
-    StringRef::iterator I = StrRef.begin();
-    if (IsCurly) // Skip the optional '{'
-       ++I;
+  // Validate GUID length.
+  if (IsCurly && StrRef.size() != 38) {
+    S.Diag(Attr.getLoc(), diag::err_attribute_uuid_malformed_guid);
+    return;
+  }
+  if (!IsCurly && StrRef.size() != 36) {
+    S.Diag(Attr.getLoc(), diag::err_attribute_uuid_malformed_guid);
+    return;
+  }
 
-    for (int i = 0; i < 36; ++i) {
-      if (i == 8 || i == 13 || i == 18 || i == 23) {
-        if (*I != '-') {
-          S.Diag(Attr.getLoc(), diag::err_attribute_uuid_malformed_guid);
-          return;
-        }
-      } else if (!isHexDigit(*I)) {
+  // GUID format is "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX" or
+  // "{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}"
+  StringRef::iterator I = StrRef.begin();
+  if (IsCurly) // Skip the optional '{'
+     ++I;
+
+  for (int i = 0; i < 36; ++i) {
+    if (i == 8 || i == 13 || i == 18 || i == 23) {
+      if (*I != '-') {
         S.Diag(Attr.getLoc(), diag::err_attribute_uuid_malformed_guid);
         return;
       }
-      I++;
+    } else if (!isHexDigit(*I)) {
+      S.Diag(Attr.getLoc(), diag::err_attribute_uuid_malformed_guid);
+      return;
     }
+    I++;
+  }
 
-    D->addAttr(::new (S.Context)
-               UuidAttr(Attr.getRange(), S.Context, Str->getString(),
-                        Attr.getAttributeSpellingListIndex()));
-  } else
-    S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "uuid";
+  D->addAttr(::new (S.Context)
+             UuidAttr(Attr.getRange(), S.Context, Str->getString(),
+                      Attr.getAttributeSpellingListIndex()));
 }
 
 static void handleInheritanceAttr(Sema &S, Decl *D, const AttributeList &Attr) {
-  if (!S.LangOpts.MicrosoftExt) {
-    S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
+  if (!checkMicrosoftExt(S, Attr))
     return;
-  }
 
   AttributeList::Kind Kind = Attr.getKind();
   if (Kind == AttributeList::AT_SingleInheritance)
@@ -4656,31 +4664,30 @@ static void handleInheritanceAttr(Sema &S, Decl *D, const AttributeList &Attr) {
 }
 
 static void handlePortabilityAttr(Sema &S, Decl *D, const AttributeList &Attr) {
-  if (S.LangOpts.MicrosoftExt) {
-    AttributeList::Kind Kind = Attr.getKind();
-    if (Kind == AttributeList::AT_Ptr32)
-      D->addAttr(
-          ::new (S.Context) Ptr32Attr(Attr.getRange(), S.Context,
-                                      Attr.getAttributeSpellingListIndex()));
-    else if (Kind == AttributeList::AT_Ptr64)
-      D->addAttr(
-          ::new (S.Context) Ptr64Attr(Attr.getRange(), S.Context,
-                                      Attr.getAttributeSpellingListIndex()));
-    else if (Kind == AttributeList::AT_Win64)
-      D->addAttr(
-          ::new (S.Context) Win64Attr(Attr.getRange(), S.Context,
-                                      Attr.getAttributeSpellingListIndex()));
-  } else
-    S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
+  if (!checkMicrosoftExt(S, Attr))
+    return;
+
+  AttributeList::Kind Kind = Attr.getKind();
+  if (Kind == AttributeList::AT_Ptr32)
+    D->addAttr(
+        ::new (S.Context) Ptr32Attr(Attr.getRange(), S.Context,
+                                    Attr.getAttributeSpellingListIndex()));
+  else if (Kind == AttributeList::AT_Ptr64)
+    D->addAttr(
+        ::new (S.Context) Ptr64Attr(Attr.getRange(), S.Context,
+                                    Attr.getAttributeSpellingListIndex()));
+  else if (Kind == AttributeList::AT_Win64)
+    D->addAttr(
+        ::new (S.Context) Win64Attr(Attr.getRange(), S.Context,
+                                    Attr.getAttributeSpellingListIndex()));
 }
 
 static void handleForceInlineAttr(Sema &S, Decl *D, const AttributeList &Attr) {
-  if (S.LangOpts.MicrosoftExt)
-    D->addAttr(::new (S.Context)
-               ForceInlineAttr(Attr.getRange(), S.Context,
-                               Attr.getAttributeSpellingListIndex()));
-  else
-    S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
+  if (!checkMicrosoftExt(S, Attr))
+    return;
+  D->addAttr(::new (S.Context)
+             ForceInlineAttr(Attr.getRange(), S.Context,
+                             Attr.getAttributeSpellingListIndex()));
 }
 
 //===----------------------------------------------------------------------===//