[find-all-symbols] Save relative file path for each symbol.

[hokein]

Summary

The HeaderSearch::suggestPathToFileForDiagnostics used in include-fixer
doesn't work well with absolute file path, it assumes a relative file
path based on header searching path.

So saving relative file path to make include-fixer get the most
appropriate header path.

[hokein]

include-fixer/find-all-symbols/SymbolInfo.h

81

One question is that whether should we add a BuildDir in SymbolInfo. With BuildDir, we can check the build directory in include-fixer make sure they are the same :).

[bkramer]

LG!

[bkramer]

include-fixer/find-all-symbols/SymbolInfo.h

81

Hmm. If both the symbol finder and include fixer run on the same compilation database this can never happen, right?

[hokein]

include-fixer/find-all-symbols/SymbolInfo.h

81

Yeah. So don't do it now.

include-fixer/find-all-symbols/FindAllSymbols.cpp

 #include "clang/AST/Decl.h"
 #include "clang/AST/DeclCXX.h"
 #include "clang/AST/Type.h"
 #include "clang/ASTMatchers/ASTMatchFinder.h"
 #include "clang/ASTMatchers/ASTMatchers.h"
 #include "clang/Tooling/Tooling.h"
 #include "llvm/ADT/Optional.h"
 #include "llvm/Support/FileSystem.h"
-#include "llvm/Support/Path.h"
 
 using namespace clang::ast_matchers;
 
 namespace clang {
 namespace find_all_symbols {
 namespace {
 std::vector<SymbolInfo::Context> GetContexts(const NamedDecl *ND) {
   std::vector<SymbolInfo::Context> Contexts;
llvm::errs() << "Declaration " << ND->getNameAsString() << "("
                  << ND->getDeclKindName()
                  << ") has invalid declaration location.";
     return llvm::None;
   }
   llvm::StringRef FilePath = SM.getFilename(Loc);
   if (FilePath.empty())
     return llvm::None;
 
-  llvm::SmallString<128> AbsolutePath;
-  if (llvm::sys::path::is_absolute(FilePath)) {
-    AbsolutePath = FilePath;
-  } else {
-    auto WorkingDir = SM.getFileManager()
-                          .getVirtualFileSystem()
-                          ->getCurrentWorkingDirectory();
-    if (!WorkingDir)
-      return llvm::None;
-    AbsolutePath = *WorkingDir;
-    llvm::sys::path::append(AbsolutePath, FilePath);
-  }
-
-  llvm::sys::path::remove_dots(AbsolutePath, true);
-  return SymbolInfo(ND->getNameAsString(), Type, AbsolutePath.str(),
+  return SymbolInfo(ND->getNameAsString(), Type, FilePath.str(),
                     GetContexts(ND), SM.getExpansionLineNumber(Loc));
 }
 
 } // namespace
 
 void FindAllSymbols::registerMatchers(MatchFinder *MatchFinder) {
   // FIXME: Handle specialization.
   auto IsInSpecialization = hasAncestor(

include-fixer/find-all-symbols/SymbolInfo.h

SymbolInfo(llvm::StringRef Name, SymbolKind Type, llvm::StringRef FilePath,
              const std::vector<Context> &Contexts, int LineNumber);
 
   /// \brief Get symbol name.
   llvm::StringRef getName() const;
 
   /// \brief Get symbol type.
   SymbolKind getSymbolKind() const;
 
-  /// \brief Get the file path where symbol comes from
+  /// \brief Get a relative file path where symbol comes from.
   llvm::StringRef getFilePath() const;
 
   /// \brief Get symbol contexts.
   const std::vector<SymbolInfo::Context> &getContexts() const;
 
   /// \brief Get a 1-based line number of the symbol's declaration.
   int getLineNumber() const;
 
   bool operator<(const SymbolInfo &Symbol) const;
 
   bool operator==(const SymbolInfo &Symbol) const;
 
 private:
   friend struct llvm::yaml::MappingTraits<SymbolInfo>;
 
   /// \brief Identifier name.
   std::string Name;
 
   /// \brief Symbol type.
   SymbolKind Type;
 
-  /// \brief The file path where the symbol comes from.
+  /// \brief The file path where the symbol comes from. It's a relative file
+  /// path based on the build directory.
   std::string FilePath;
 
   /// \brief Contains information about symbol contexts. Context information is
   /// stored from the inner-most level to outer-most level.
   ///
   /// For example, if a symbol 'x' is declared as:
   ///     namespace na { namespace nb { class A { int x; } } }
   /// The contexts would be { {RECORD, "A"}, {NAMESPACE, "nb"}, {NAMESPACE,