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

// Copyright (c) 2010 Google Inc.

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// stackwalker_arm.h: arm-specific stackwalker.

//

// Provides stack frames given arm register context and a memory region

// corresponding to an arm stack.

//

// Author: Mark Mentovai, Ted Mielczarek

#ifndef PROCESSOR_STACKWALKER_ARM_H__

#define PROCESSOR_STACKWALKER_ARM_H__

#include "google_breakpad/common/breakpad_types.h"

#include "google_breakpad/common/minidump_format.h"

#include "google_breakpad/processor/stackwalker.h"

namespace google_breakpad {

class CodeModules;

class StackwalkerARM : public Stackwalker {

 public:

  // context is an arm context object that gives access to arm-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.

  StackwalkerARM(const SystemInfo* system_info,

                 const MDRawContextARM* context,

                 int fp_register,

                 MemoryRegion* memory,

                 const CodeModules* modules,

                 StackFrameSymbolizer* frame_symbolizer);

  // Change the context validity mask of the frame returned by

  // GetContextFrame to VALID. This is only for use by unit tests; the

  // default behavior is correct for all application code.

  void SetContextFrameValidity(int valid) { context_frame_validity_ = valid; }

 private:

  // Implementation of Stackwalker, using arm 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.

  StackFrameARM* GetCallerByCFIFrameInfo(const vector<StackFrame*> &frames,

                                         CFIFrameInfo* cfi_frame_info);

  // Use the frame pointer. The caller takes ownership of the returned frame.

  // Return NULL on failure.

  StackFrameARM* GetCallerByFramePointer(const vector<StackFrame*> &frames);

  // Scan the stack for plausible return addresses. The caller takes ownership

  // of the returned frame. Return NULL on failure.

  StackFrameARM* GetCallerByStackScan(const vector<StackFrame*> &frames);

  // Stores the CPU context corresponding to the youngest stack frame, to

  // be returned by GetContextFrame.

  const MDRawContextARM* context_;

  // The register to use a as frame pointer. The value is -1 if frame pointer

  // cannot be used.

  int fp_register_;

  // Validity mask for youngest stack frame. This is always

  // CONTEXT_VALID_ALL in real use; it is only changeable for the sake of

  // unit tests.

  int context_frame_validity_;

};

}  // namespace google_breakpad

#endif  // PROCESSOR_STACKWALKER_ARM_H__