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diff --git a/tools/profiler/lul/AutoObjectMapper.h b/tools/profiler/lul/AutoObjectMapper.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef AutoObjectMapper_h
+#define AutoObjectMapper_h
+
+#include <string>
+
+#include "mozilla/Attributes.h"
+#include "PlatformMacros.h"
+
+// A (nearly-) RAII class that maps an object in and then unmaps it on
+// destruction.  This base class version uses the "normal" POSIX
+// functions: open, fstat, close, mmap, munmap.
+
+class MOZ_STACK_CLASS AutoObjectMapperPOSIX {
+public:
+  // The constructor does not attempt to map the file, because that
+  // might fail.  Instead, once the object has been constructed,
+  // call Map() to attempt the mapping.  There is no corresponding
+  // Unmap() since the unmapping is done in the destructor.  Failure
+  // messages are sent to |aLog|.
+  explicit AutoObjectMapperPOSIX(void(*aLog)(const char*));
+
+  // Unmap the file on destruction of this object.
+  ~AutoObjectMapperPOSIX();
+
+  // Map |fileName| into the address space and return the mapping
+  // extents.  If the file is zero sized this will fail.  The file is
+  // mapped read-only and private.  Returns true iff the mapping
+  // succeeded, in which case *start and *length hold its extent.
+  // Once a call to Map succeeds, all subsequent calls to it will
+  // fail.
+  bool Map(/*OUT*/void** start, /*OUT*/size_t* length, std::string fileName);
+
+protected:
+  // If we are currently holding a mapped object, these record the
+  // mapped address range.
+  void*  mImage;
+  size_t mSize;
+
+  // A logging sink, for complaining about mapping failures.
+  void (*mLog)(const char*);
+
+private:
+  // Are we currently holding a mapped object?  This is private to
+  // the base class.  Derived classes need to have their own way to
+  // track whether they are holding a mapped object.
+  bool mIsMapped;
+
+  // Disable copying and assignment.
+  AutoObjectMapperPOSIX(const AutoObjectMapperPOSIX&);
+  AutoObjectMapperPOSIX& operator=(const AutoObjectMapperPOSIX&);
+  // Disable heap allocation of this class.
+  void* operator new(size_t);
+  void* operator new[](size_t);
+  void  operator delete(void*);
+  void  operator delete[](void*);
+};
+
+
+#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
+// This is a variant of AutoObjectMapperPOSIX suitable for use in
+// conjunction with faulty.lib on Android.  How it behaves depends on
+// the name of the file to be mapped.  There are three possible cases:
+//
+// (1) /foo/bar/xyzzy/blah.apk!/libwurble.so
+//     We hand it as-is to faulty.lib and let it fish the relevant
+//     bits out of the APK.
+//
+// (2) libmozglue.so
+//     This is part of the Fennec installation, but is not in the
+//     APK.  Instead we have to figure out the installation path
+//     and look for it there.  Because of faulty.lib limitations,
+//     we have to use regular open/mmap instead of faulty.lib.
+//
+// (3) libanythingelse.so
+//     faulty.lib assumes this is a system library, and prepends
+//     "/system/lib/" to the path.  So as in (1), we can give it
+//     as-is to faulty.lib.
+//
+// Hence (1) and (3) require special-casing here.  Case (2) simply
+// hands the problem to the parent class.
+
+class MOZ_STACK_CLASS AutoObjectMapperFaultyLib : public AutoObjectMapperPOSIX {
+public:
+  AutoObjectMapperFaultyLib(void(*aLog)(const char*));
+
+  ~AutoObjectMapperFaultyLib();
+
+  bool Map(/*OUT*/void** start, /*OUT*/size_t* length, std::string fileName);
+
+private:
+  // faulty.lib requires us to maintain an abstract handle that can be
+  // used later to unmap the area.  If this is non-NULL, it is assumed
+  // that unmapping is to be done by faulty.lib.  Otherwise it goes
+  // via the normal mechanism.
+  void* mHdl;
+
+  // Disable copying and assignment.
+  AutoObjectMapperFaultyLib(const AutoObjectMapperFaultyLib&);
+  AutoObjectMapperFaultyLib& operator=(const AutoObjectMapperFaultyLib&);
+  // Disable heap allocation of this class.
+  void* operator new(size_t);
+  void* operator new[](size_t);
+  void  operator delete(void*);
+  void  operator delete[](void*);
+};
+
+#endif // defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
+
+#endif // AutoObjectMapper_h