Clang: Extract highlighting information

Prepare the move of the semantic highlighting to the clang back end. We
have it under tests too so it should be quite easy to make changes or
corrections.

Change-Id: I5706a8a06fde5a9ba2eba3a8ba62782102ac0bd3
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

src/tools/clangbackend/ipcsource/sourcelocation.h

@@ -38,13 +38,19 @@
 namespace ClangBackEnd {
 
 class SourceLocationContainer;
+class TranslationUnit;
 
 class SourceLocation
 {
     friend class Diagnostic;
     friend class SourceRange;
+    friend class TranslationUnit;
+    friend class Cursor;
+    friend bool operator==(const SourceLocation &first, const SourceLocation &second);
 
 public:
+    SourceLocation();
+
     const Utf8String &filePath() const;
     uint line() const;
     uint column() const;
@@ -54,14 +60,23 @@ public:
 
 private:
     SourceLocation(CXSourceLocation cxSourceLocation);
+    SourceLocation(CXTranslationUnit cxTranslationUnit,
+                   const Utf8String &filePath,
+                   uint line,
+                   uint column);
+
+    operator CXSourceLocation() const;
 
 private:
+   CXSourceLocation cxSourceLocation;
    Utf8String filePath_;
-   uint line_;
-   uint column_;
-   uint offset_;
+   uint line_ = 0;
+   uint column_ = 0;
+   uint offset_ = 0;
 };
 
+bool operator==(const SourceLocation &first, const SourceLocation &second);
+
 void PrintTo(const SourceLocation &sourceLocation, ::std::ostream* os);
 
 } // namespace ClangBackEnd