courgette/rel32_finder.h

// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COURGETTE_REL32_FINDER_H_
#define COURGETTE_REL32_FINDER_H_

#include <stdint.h>

#include <map>
#include <vector>

#include "courgette/image_utils.h"

namespace courgette {

// A helper class to scan through a section of code to extract RVAs.
class Rel32Finder {
 public:
  Rel32Finder(RVA relocs_start_rva, RVA relocs_end_rva);
  virtual ~Rel32Finder() = default;

  // Swaps data in |rel32_locations_| with |dest|.
  void SwapRel32Locations(std::vector<RVA>* dest);

#if COURGETTE_HISTOGRAM_TARGETS
  // Swaps data in |rel32_target_rvas_| with |dest|.
  void SwapRel32TargetRVAs(std::map<RVA, int>* dest);
#endif

  // Scans through [|start_pointer|, |end_pointer|) for rel32 addresses. Seeks
  // RVAs that satisfy the following:
  // - Do not overlap with |abs32_locations| (assumed sorted).
  // - Do not overlap with [relocs_start_rva, relocs_end_rva).
  // - Whose targets are in [|start_rva|, |end_rva|).
  // The sorted results are written to |rel32_locations_|.
  virtual void Find(const uint8_t* start_pointer,
                    const uint8_t* end_pointer,
                    RVA start_rva,
                    RVA end_rva,
                    const std::vector<RVA>& abs32_locations) = 0;

 protected:
  const RVA relocs_start_rva_;
  const RVA relocs_end_rva_;

  std::vector<RVA> rel32_locations_;

#if COURGETTE_HISTOGRAM_TARGETS
  std::map<RVA, int> rel32_target_rvas_;
#endif
};

}  // namespace courgette

#endif  // COURGETTE_REL32_FINDER_H_