// Copyright (c) 2006, 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.

// stack_frame_info.h: Holds debugging information about a stack frame.
//
// This structure is specific to Windows debugging information obtained
// from pdb files using the DIA API.
//
// Author: Mark Mentovai


#ifndef PROCESSOR_STACK_FRAME_INFO_H__
#define PROCESSOR_STACK_FRAME_INFO_H__

#include <string>

#include "google_breakpad/common/breakpad_types.h"

namespace google_breakpad {

struct StackFrameInfo {
 public:
  enum Validity {
    VALID_NONE           = 0,
    VALID_PARAMETER_SIZE = 1,
    VALID_ALL            = -1
  };

  StackFrameInfo() : valid(VALID_NONE),
                     prolog_size(0),
                     epilog_size(0),
                     parameter_size(0),
                     saved_register_size(0),
                     local_size(0),
                     max_stack_size(0),
                     allocates_base_pointer(0),
                     program_string() {}

  StackFrameInfo(u_int32_t set_prolog_size,
                 u_int32_t set_epilog_size,
                 u_int32_t set_parameter_size,
                 u_int32_t set_saved_register_size,
                 u_int32_t set_local_size,
                 u_int32_t set_max_stack_size,
                 int set_allocates_base_pointer,
                 const std::string set_program_string)
      : valid(VALID_ALL),
        prolog_size(set_prolog_size),
        epilog_size(set_epilog_size),
        parameter_size(set_parameter_size),
        saved_register_size(set_saved_register_size),
        local_size(set_local_size),
        max_stack_size(set_max_stack_size),
        allocates_base_pointer(set_allocates_base_pointer),
        program_string(set_program_string) {}

  // CopyFrom makes "this" StackFrameInfo object identical to "that".
  void CopyFrom(const StackFrameInfo &that) {
    valid = that.valid;
    prolog_size = that.prolog_size;
    epilog_size = that.epilog_size;
    parameter_size = that.parameter_size;
    saved_register_size = that.saved_register_size;
    local_size = that.local_size;
    max_stack_size = that.max_stack_size;
    allocates_base_pointer = that.allocates_base_pointer;
    program_string = that.program_string;
  }

  // Clears the StackFrameInfo object so that users will see it as though
  // it contains no information.
  void Clear() {
    valid = VALID_NONE;
    program_string.erase();
  }

  // Identifies which fields in the structure are valid.  This is of
  // type Validity, but it is defined as an int because it's not
  // possible to OR values into an enumerated type.  Users must check
  // this field before using any other.
  int valid;

  // These values come from IDiaFrameData.
  u_int32_t prolog_size;
  u_int32_t epilog_size;
  u_int32_t parameter_size;
  u_int32_t saved_register_size;
  u_int32_t local_size;
  u_int32_t max_stack_size;

  // Only one of allocates_base_pointer or program_string will be valid.
  // If program_string is empty, use allocates_base_pointer.
  bool allocates_base_pointer;
  std::string program_string;
};

}  // namespace google_breakpad


#endif  // PROCESSOR_STACK_FRAME_INFO_H__