// Copyright (c) 2006, Google Inc.
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// stackwalker_x86.h: x86-specific stackwalker.
//
// Provides stack frames given x86 register context and a memory region
// corresponding to an x86 stack.
//
// Author: Mark Mentovai


#ifndef PROCESSOR_STACKWALKER_X86_H__
#define PROCESSOR_STACKWALKER_X86_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 StackwalkerX86 : public Stackwalker {
 public:
  // context is an x86 context object that gives access to x86-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.
  StackwalkerX86(const SystemInfo *system_info,
                 const MDRawContextX86 *context,
                 MemoryRegion *memory,
                 const CodeModules *modules,
                 SymbolSupplier *supplier,
                 SourceLineResolverInterface *resolver);

 private:
  // Implementation of Stackwalker, using x86 context (%ebp, %esp, %eip) and
  // stack conventions (saved %ebp at [%ebp], saved %eip at 4[%ebp], or
  // alternate conventions as guided by stack_frame_info_).
  virtual StackFrame* GetContextFrame();
  virtual StackFrame* GetCallerFrame(
      const CallStack *stack,
      const vector< linked_ptr<StackFrameInfo> > &stack_frame_info);

  // Stores the CPU context corresponding to the innermost stack frame to
  // be returned by GetContextFrame.
  const MDRawContextX86 *context_;
};


}  // namespace google_breakpad


#endif  // PROCESSOR_STACKWALKER_X86_H__