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+// -*- mode: c++ -*-
+
+// Copyright (c) 2010 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_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 <vector>
+
+#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 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,
+                 StackFrameSymbolizer* frame_symbolizer);
+
+ private:
+  // A STACK CFI-driven frame walker for the X86.
+  typedef SimpleCFIWalker<uint32_t, MDRawContextX86> CFIWalker;
+
+  // 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 any WindowsFrameInfo available for the
+  // code in question.).
+  virtual StackFrame* GetContextFrame();
+  virtual StackFrame* GetCallerFrame(const CallStack* stack,
+                                     bool stack_scan_allowed);
+
+  // Use windows_frame_info (derived from STACK WIN and FUNC records)
+  // to construct the frame that called frames.back(). The caller
+  // takes ownership of the returned frame. Return NULL on failure.
+  StackFrameX86* GetCallerByWindowsFrameInfo(
+      const vector<StackFrame*> &frames,
+      WindowsFrameInfo* windows_frame_info,
+      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.
+  StackFrameX86* GetCallerByCFIFrameInfo(const vector<StackFrame*> &frames,
+                                         CFIFrameInfo* cfi_frame_info);
+
+  // Assuming a traditional frame layout --- where the caller's %ebp
+  // has been pushed just after the return address and the callee's
+  // %ebp points to the saved %ebp --- construct the frame that called
+  // frames.back(). The caller takes ownership of the returned frame.
+  // Return NULL on failure.
+  StackFrameX86* GetCallerByEBPAtBase(const vector<StackFrame*> &frames,
+                                      bool stack_scan_allowed);
+
+  // Stores the CPU context corresponding to the innermost stack frame to
+  // be returned by GetContextFrame.
+  const MDRawContextX86* context_;
+
+  // Our register map, for cfi_walker_.
+  static const CFIWalker::RegisterSet cfi_register_map_[];
+
+  // Our CFI frame walker.
+  const CFIWalker cfi_walker_;
+};
+
+
+}  // namespace google_breakpad
+
+
+#endif  // PROCESSOR_STACKWALKER_X86_H__