Revert "migrator: handle AppKit protocol migrations. rdar://42480588"

lib/Migrator/APIDiffMigratorPass.cpp

@@ -363,7 +363,6 @@ struct APIDiffMigratorPass : public ASTMigratorPass, public SourceEntityWalker {
 
   std::vector<ConversionFunctionInfo> HelperFuncInfo;
   SourceLoc FileEndLoc;
-  llvm::StringSet<> OverridingRemoveNames;
 
   /// For a given expression, check whether the type of this expression is
   /// name alias type, and the name alias type is known to change to raw
@@ -386,8 +385,7 @@ struct APIDiffMigratorPass : public ASTMigratorPass, public SourceEntityWalker {
   APIDiffMigratorPass(EditorAdapter &Editor, SourceFile *SF,
                       const MigratorOptions &Opts):
     ASTMigratorPass(Editor, SF, Opts), DiffStore(Diags),
-    FileEndLoc(SM.getRangeForBuffer(BufferID).getEnd()),
-    OverridingRemoveNames(funcNamesForOverrideRemoval()) {}
+    FileEndLoc(SM.getRangeForBuffer(BufferID).getEnd()) {}
 
   ~APIDiffMigratorPass() {
     Editor.disableCache();
@@ -1292,92 +1290,6 @@ struct APIDiffMigratorPass : public ASTMigratorPass, public SourceEntityWalker {
     }
   }
 
-  llvm::StringSet<> funcNamesForOverrideRemoval() {
-    llvm::StringSet<> Results;
-    Results.insert("c:objc(cs)NSObject(im)application:delegateHandlesKey:");
-    Results.insert("c:objc(cs)NSObject(im)changeColor:");
-    Results.insert("c:objc(cs)NSObject(im)controlTextDidBeginEditing:");
-    Results.insert("c:objc(cs)NSObject(im)controlTextDidEndEditing:");
-    Results.insert("c:objc(cs)NSObject(im)controlTextDidChange:");
-    Results.insert("c:objc(cs)NSObject(im)changeFont:");
-    Results.insert("c:objc(cs)NSObject(im)validModesForFontPanel:");
-    Results.insert("c:objc(cs)NSObject(im)discardEditing");
-    Results.insert("c:objc(cs)NSObject(im)commitEditing");
-    Results.insert("c:objc(cs)NSObject(im)commitEditingWithDelegate:didCommitSelector:contextInfo:");
-    Results.insert("c:objc(cs)NSObject(im)commitEditingAndReturnError:");
-    Results.insert("c:objc(cs)NSObject(im)objectDidBeginEditing:");
-    Results.insert("c:objc(cs)NSObject(im)objectDidEndEditing:");
-    Results.insert("c:objc(cs)NSObject(im)validateMenuItem:");
-    Results.insert("c:objc(cs)NSObject(im)pasteboard:provideDataForType:");
-    Results.insert("c:objc(cs)NSObject(im)pasteboardChangedOwner:");
-    Results.insert("c:objc(cs)NSObject(im)validateToolbarItem:");
-    Results.insert("c:objc(cs)NSObject(im)layer:shouldInheritContentsScale:fromWindow:");
-    Results.insert("c:objc(cs)NSObject(im)view:stringForToolTip:point:userData:");
-    return Results;
-  }
-
-  SourceLoc shouldRemoveOverride(AbstractFunctionDecl *AFD) {
-    if (AFD->getKind() != DeclKind::Func)
-      return SourceLoc();
-    SourceLoc OverrideLoc;
-
-    // Get the location of override keyword.
-    if (auto *Override = AFD->getAttrs().getAttribute<OverrideAttr>()) {
-      if (Override->getRange().isValid()) {
-        OverrideLoc = Override->getLocation();
-      }
-    }
-    if (OverrideLoc.isInvalid())
-      return SourceLoc();
-    auto *OD = AFD->getOverriddenDecl();
-    llvm::SmallString<64> Buffer;
-    llvm::raw_svector_ostream OS(Buffer);
-    if (swift::ide::printDeclUSR(OD, OS))
-      return SourceLoc();
-    return OverridingRemoveNames.find(OS.str()) == OverridingRemoveNames.end() ?
-      SourceLoc() : OverrideLoc;
-  }
-
-  struct SuperRemoval: public ASTWalker {
-    EditorAdapter &Editor;
-    llvm::StringSet<> &USRs;
-    SuperRemoval(EditorAdapter &Editor, llvm::StringSet<> &USRs):
-      Editor(Editor), USRs(USRs) {}
-    bool isSuperExpr(Expr *E) {
-      if (E->isImplicit())
-	return false;
-      // Check if the expression is super.foo().
-      if (auto *CE = dyn_cast<CallExpr>(E)) {
-        if (auto *DSC = dyn_cast<DotSyntaxCallExpr>(CE->getFn())) {
-          if (DSC->getBase()->getKind() != ExprKind::SuperRef)
-            return false;
-          llvm::SmallString<64> Buffer;
-          llvm::raw_svector_ostream OS(Buffer);
-          auto *RD = DSC->getFn()->getReferencedDecl().getDecl();
-          if (swift::ide::printDeclUSR(RD, OS))
-            return false;
-          return USRs.find(OS.str()) != USRs.end();
-        }
-      }
-      // We should handle try super.foo() too.
-      if (auto *TE = dyn_cast<AnyTryExpr>(E)) {
-        return isSuperExpr(TE->getSubExpr());
-      }
-      return false;
-    }
-    std::pair<bool, Stmt*> walkToStmtPre(Stmt *S) override {
-      if (auto *BS = dyn_cast<BraceStmt>(S)) {
-	for(auto Ele: BS->getElements()) {
-	  if (Ele.is<Expr*>() && isSuperExpr(Ele.get<Expr*>())) {
-	    Editor.remove(Ele.getSourceRange());
-          }
-	}
-      }
-      // We only handle top-level expressions, so avoid visiting further.
-      return {false, S};
-    }
-  };
-
   bool walkToDeclPre(Decl *D, CharSourceRange Range) override {
     if (D->isImplicit())
       return true;
@@ -1393,14 +1305,6 @@ struct APIDiffMigratorPass : public ASTMigratorPass, public SourceEntityWalker {
             handleLocalParameterBridge(AFD, DiffItem);
         }
       }
-      auto OverrideLoc = shouldRemoveOverride(AFD);
-      if (OverrideLoc.isValid()) {
-        // Remove override keyword.
-        Editor.remove(OverrideLoc);
-        // Remove super-dot call.
-        SuperRemoval Removal(Editor, OverridingRemoveNames);
-        D->walk(Removal);
-      }
     }
     return true;
   }