[SymbolGraph] Use fully qualified name for type's page titles

rdar://64047985

Author: bitjammer

lib/SymbolGraphGen/Symbol.cpp

@@ -125,8 +125,22 @@ void Symbol::serializeNames(llvm::json::OStream &OS) const {
   OS.attributeObject("names", [&](){
     SmallVector<SmallString<32>, 8> PathComponents;
     getPathComponents(PathComponents);
-    
-    OS.attribute("title", PathComponents.back());
+
+    if (isa<GenericTypeDecl>(VD)) {    
+      SmallString<64> FullyQualifiedTitle;
+
+      for (const auto *It = PathComponents.begin(); It != PathComponents.end(); ++It) {
+        if (It != PathComponents.begin()) {
+          FullyQualifiedTitle.push_back('.');
+        }
+        FullyQualifiedTitle.append(*It);
+      }
+      
+      OS.attribute("title", FullyQualifiedTitle.str());
+    } else {
+      OS.attribute("title", PathComponents.back());
+    }
+
     Graph->serializeNavigatorDeclarationFragments("navigator", *this, OS);
     Graph->serializeSubheadingDeclarationFragments("subHeading", *this, OS);
     // "prose": null

test/SymbolGraph/Symbols/Names.swift

@@ -2,8 +2,30 @@
 // RUN: %target-build-swift %s -module-name Names -emit-module -emit-module-path %t/
 // RUN: %target-swift-symbolgraph-extract -module-name Names -I %t -pretty-print -output-dir %t
 // RUN: %FileCheck %s --input-file %t/Names.symbols.json
+// RUN: %FileCheck %s --input-file %t/Names.symbols.json --check-prefix=FUNC
+// RUN: %FileCheck %s --input-file %t/Names.symbols.json --check-prefix=INNERTYPE
+// RUN: %FileCheck %s --input-file %t/Names.symbols.json --check-prefix=INNERTYPEALIAS
 
-public struct MyStruct {}
+public struct MyStruct {
+  public struct InnerStruct {}
 
+  public typealias InnerTypeAlias = InnerStruct
+
+  public func foo() {}
+}
+
+// CHECK-LABEL: "precise": "s:5Names8MyStructV"
 // CHECK: names
 // CHECK-NEXT: "title": "MyStruct"
+
+// FUNC-LABEL: "precise": "s:5Names8MyStructV3fooyyF",
+// FUNC: names
+// FUNC-NEXT: "title": "foo()"
+
+// INNERTYPE-LABEL: "precise": "s:5Names8MyStructV05InnerC0V"
+// INNERTYPE: names
+// INNERTYPE-NEXT: "title": "MyStruct.InnerStruct"
+
+// INNERTYPEALIAS-LABEL: "precise": "s:5Names8MyStructV14InnerTypeAliasa"
+// INNERTYPEALIAS: names
+// INNERTYPEALIAS-NEXT: "title": "MyStruct.InnerTypeAlias"