// Copyright (c) 2006, Google Inc.
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//
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//
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// simple_symbol_supplier.h: A simple SymbolSupplier implementation
//
// SimpleSymbolSupplier is a straightforward implementation of SymbolSupplier
// that stores symbol files in a filesystem tree.  A SimpleSymbolSupplier is
// created with a base directory, which is the root for all symbol files.
// Each symbol file contained therien has a directory entry in the base
// directory with a name identical to the corresponding debugging file (pdb).
// Within each of these directories, there are subdirectories named for the
// debugging file's identifier.  For recent pdb files, this is a concatenation
// of the pdb's uuid and age, presented in hexadecimal form, using uppercase
// characters and no dashes or separators.  Within that subdirectory,
// SimpleSymbolSupplier expects to find the symbol file, which is named
// identically to the debug file, but with a .sym extension.  If the original
// debug file had a name ending in .pdb, the .pdb extension will be replaced
// with .sym.  This sample hierarchy is rooted at the "symbols" base
// directory:
//
// symbols
// symbols/test_app.pdb
// symbols/test_app.pdb/63FE4780728D49379B9D7BB6460CB42A1
// symbols/test_app.pdb/63FE4780728D49379B9D7BB6460CB42A1/test_app.sym
// symbols/kernel32.pdb
// symbols/kernel32.pdb/BCE8785C57B44245A669896B6A19B9542
// symbols/kernel32.pdb/BCE8785C57B44245A669896B6A19B9542/kernel32.sym
//
// In this case, the uuid of test_app.pdb is
// 63fe4780-728d-4937-9b9d-7bb6460cb42a and its age is 1.
//
// This scheme was chosen to be roughly analogous to the way that
// symbol files may be accessed from Microsoft Symbol Server.  A hierarchy
// used for Microsoft Symbol Server storage is usable as a hierarchy for
// SimpleSymbolServer, provided that the pdb files are transformed to dumped
// format using a tool such as dump_syms, and given a .sym extension.
//
// SimpleSymbolSupplier supports any debugging file which can be identified
// by a CodeModule object's debug_file and debug_identifier accessors.  The
// expected ultimate source of these CodeModule objects are MinidumpModule
// objects; it is this class that is responsible for assigning appropriate
// values for debug_file and debug_identifier.
//
// Author: Mark Mentovai

#ifndef PROCESSOR_SIMPLE_SYMBOL_SUPPLIER_H__
#define PROCESSOR_SIMPLE_SYMBOL_SUPPLIER_H__

#include <string>

#include "google_airbag/processor/symbol_supplier.h"

namespace google_airbag {

using std::string;

class CodeModule;

class SimpleSymbolSupplier : public SymbolSupplier {
 public:
  // Creates a new SimpleSymbolSupplier, using path as the root path where
  // symbols are stored.
  explicit SimpleSymbolSupplier(const string &path) : path_(path) {}

  virtual ~SimpleSymbolSupplier() {}

  // Returns the path to the symbol file for the given module.  See the
  // description above.
  virtual string GetSymbolFile(const CodeModule *module) {
    return GetSymbolFileAtPath(module, path_);
  }

 protected:
  string GetSymbolFileAtPath(const CodeModule *module,
                             const string &root_path);

 private:
  string path_;
};

}  // namespace google_airbag

#endif  // PROCESSOR_SIMPLE_SYMBOL_SUPPLIER_H__