// -*- mode: C++ -*-

// Copyright (c) 2012 Google Inc.
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// Helper class that encapsulates the logic of how symbol supplier interacts
// with source line resolver to fill stack frame information.

#ifndef GOOGLE_BREAKPAD_PROCESSOR_STACK_FRAME_SYMBOLIZER_H__
#define GOOGLE_BREAKPAD_PROCESSOR_STACK_FRAME_SYMBOLIZER_H__

#include <set>
#include <string>

#include "common/using_std_string.h"
#include "google_breakpad/common/breakpad_types.h"
#include "google_breakpad/processor/code_module.h"

namespace google_breakpad {
class CFIFrameInfo;
class CodeModules;
class SymbolSupplier;
class SourceLineResolverInterface;
struct StackFrame;
struct SystemInfo;
struct WindowsFrameInfo;

class StackFrameSymbolizer {
 public:
  enum SymbolizerResult {
    // Symbol data was found and successfully loaded in resolver.
    // This does NOT guarantee source line info is found within symbol file.
    kNoError,
    // This indicates non-critical error, such as, no code module found for
    // frame's instruction, no symbol file, or resolver failed to load symbol.
    kError,
    // This indicates error for which stack walk should be interrupted
    // and retried in future.
    kInterrupt,
    // Symbol data was found and loaded in resolver however some corruptions
    // were detected.
    kWarningCorruptSymbols,
  };

  StackFrameSymbolizer(SymbolSupplier* supplier,
                       SourceLineResolverInterface* resolver);

  virtual ~StackFrameSymbolizer() { }

  // Encapsulate the step of resolving source line info for a stack frame.
  // "frame" must not be NULL.
  virtual SymbolizerResult FillSourceLineInfo(
      const CodeModules* modules,
      const CodeModules* unloaded_modules,
      const SystemInfo* system_info,
      StackFrame* stack_frame);

  virtual WindowsFrameInfo* FindWindowsFrameInfo(const StackFrame* frame);

  virtual CFIFrameInfo* FindCFIFrameInfo(const StackFrame* frame);

  // Reset internal (locally owned) data as if the helper is re-instantiated.
  // A typical case is to call Reset() after processing an individual report
  // before start to process next one, in order to reset internal information
  // about missing symbols found so far.
  virtual void Reset() { no_symbol_modules_.clear(); }

  // Returns true if there is valid implementation for stack symbolization.
  virtual bool HasImplementation() { return resolver_ && supplier_; }

  SourceLineResolverInterface* resolver() { return resolver_; }
  SymbolSupplier* supplier() { return supplier_; }

 protected:
  SymbolSupplier* supplier_;
  SourceLineResolverInterface* resolver_;
  // A list of modules known to have symbols missing. This helps avoid
  // repeated lookups for the missing symbols within one minidump.
  std::set<string> no_symbol_modules_;
};

}  // namespace google_breakpad

#endif  // GOOGLE_BREAKPAD_PROCESSOR_STACK_FRAME_SYMBOLIZER_H__