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// Copyright (c) 2013 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.

// stackwalker_mips.h: MIPS-specific stackwalker.
//
// Provides stack frames given MIPS register context and a memory region
// corresponding to a MIPSstack.
//
// Author: Tata Elxsi

#ifndef PROCESSOR_STACKWALKER_MIPS_H__
#define PROCESSOR_STACKWALKER_MIPS_H__

#include "google_breakpad/common/breakpad_types.h"
#include "google_breakpad/common/minidump_format.h"
#include "google_breakpad/processor/stackwalker.h"
#include "google_breakpad/processor/stack_frame_cpu.h"
#include "processor/cfi_frame_info.h"

namespace google_breakpad {

class CodeModules;

class StackwalkerMIPS : public Stackwalker {
 public:
  // Context is a MIPS context object that gives access to mips-specific
  // register state corresponding to the innermost called frame to be
  // included in the stack.  The other arguments are passed directly
  // through to the base Stackwalker constructor.
  StackwalkerMIPS(const SystemInfo* system_info,
                  const MDRawContextMIPS* context,
                  MemoryRegion* memory,
                  const CodeModules* modules,
                  StackFrameSymbolizer* frame_symbolizer);

 private:
  // Implementation of Stackwalker, using mips context and stack conventions.
  virtual StackFrame* GetContextFrame();
  virtual StackFrame* GetCallerFrame(const CallStack* stack,
                                     bool stack_scan_allowed);

  // Use cfi_frame_info (derived from STACK CFI records) to construct
  // the frame that called frames.back(). The caller takes ownership
  // of the returned frame. Return NULL on failure.
  StackFrameMIPS* GetCallerByCFIFrameInfo(const vector<StackFrame*>& frames,
                                          CFIFrameInfo* cfi_frame_info);

  // Scan the stack for plausible return address and frame pointer pair. 
  // The caller takes ownership of the returned frame. Return NULL on failure.
  StackFrameMIPS* GetCallerByStackScan(const vector<StackFrame*>& frames);

  // Stores the CPU context corresponding to the innermost stack frame to
  // be returned by GetContextFrame.
  const MDRawContextMIPS* context_;
};

}  // namespace google_breakpad

#endif  // PROCESSOR_STACKWALKER_MIPS_H__