FastSourceLineResolver implementation for optimization purpose.

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@719 4c0a9323-5329-0410-9bdc-e9ce6186880e

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+// Copyright (c) 2010 Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// fast_source_line_resolver.h: FastSourceLineResolver is derived from
+// SourceLineResolverBase, and is a concrete implementation of
+// SourceLineResolverInterface.
+//
+// FastSourceLineResolver is a sibling class of BasicSourceLineResolver.  The
+// difference is FastSourceLineResolver loads a serialized memory chunk of data
+// which can be used directly a Module without parsing or copying of underlying
+// data.  Therefore loading a symbol in FastSourceLineResolver is much faster
+// and more memory-efficient than BasicSourceLineResolver.
+//
+// See "source_line_resolver_base.h" and
+// "google_breakpad/source_line_resolver_interface.h" for more reference.
+//
+// Author: Siyang Xie (lambxsy@google.com)
+
+#ifndef GOOGLE_BREAKPAD_PROCESSOR_FAST_SOURCE_LINE_RESOLVER_H__
+#define GOOGLE_BREAKPAD_PROCESSOR_FAST_SOURCE_LINE_RESOLVER_H__
+
+#include <map>
+#include <string>
+
+#include "google_breakpad/processor/source_line_resolver_base.h"
+
+namespace google_breakpad {
+
+using std::map;
+
+class FastSourceLineResolver : public SourceLineResolverBase {
+ public:
+  FastSourceLineResolver();
+  virtual ~FastSourceLineResolver() { }
+
+  using SourceLineResolverBase::FillSourceLineInfo;
+  using SourceLineResolverBase::FindCFIFrameInfo;
+  using SourceLineResolverBase::FindWindowsFrameInfo;
+  using SourceLineResolverBase::HasModule;
+  using SourceLineResolverBase::LoadModule;
+  using SourceLineResolverBase::LoadModuleUsingMapBuffer;
+  using SourceLineResolverBase::LoadModuleUsingMemoryBuffer;
+  using SourceLineResolverBase::UnloadModule;
+
+ private:
+  // Friend declarations.
+  friend class ModuleComparer;
+  friend class ModuleSerializer;
+  friend class FastModuleFactory;
+
+  // Nested types that will derive from corresponding nested types defined in
+  // SourceLineResolverBase.
+  struct Line;
+  struct Function;
+  struct PublicSymbol;
+  class Module;
+
+  // Deserialize raw memory data to construct a WindowsFrameInfo object.
+  static WindowsFrameInfo CopyWFI(const char *raw_memory);
+
+  // Helper methods to manage C-String format symbol data.
+  // See "google_breakpad/processor/source_line_resolver_base.h" for more
+  // comments about these helper methods.
+  virtual void StoreDataBeforeLoad(const CodeModule *module, char *symbol_data);
+  virtual void DeleteDataUnload(const CodeModule *module);
+  virtual void ClearLocalMemory();
+  // No-op helper method.
+  virtual void DeleteDataAfterLoad(char *symbol_data) { }
+
+  // Store memory data allocated in LoadModule and LoadModuleUsingMapBuffer.
+  typedef std::map<string, char*, CompareString> MemoryMap;
+  MemoryMap memory_chunks_;
+
+  // Disallow unwanted copy ctor and assignment operator
+  FastSourceLineResolver(const FastSourceLineResolver&);
+  void operator=(const FastSourceLineResolver&);
+};
+
+}  // namespace google_breakpad
+
+#endif  // GOOGLE_BREAKPAD_PROCESSOR_FAST_SOURCE_LINE_RESOLVER_H__