mac: Implement GetStackEnd().

base/debug/stack_trace.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_DEBUG_STACK_TRACE_H_
 #define BASE_DEBUG_STACK_TRACE_H_
 
 #include <stddef.h>
 
 #include <iosfwd>
@@ skipping 27 matching lines @@
 // When enabled, the process will quit immediately. This is meant to be used in
 // unit_tests only! This is not thread-safe: only call from main thread.
 // In sandboxed processes, this has to be called before the sandbox is turned
 // on.
 // Calling this function on Linux opens /proc/self/maps and caches its
 // contents. In non-official builds, this function also opens the object files
 // that are loaded in memory and caches their file descriptors (this cannot be
 // done in official builds because it has security implications).
 BASE_EXPORT bool EnableInProcessStackDumping();
 
+// Returns end of the stack, or 0 if we couldn't get it.
+#if HAVE_TRACE_STACK_FRAME_POINTERS
+BASE_EXPORT uintptr_t GetStackEnd();
+#endif
+
 // A stacktrace can be helpful in debugging. For example, you can include a
 // stacktrace member in a object (probably around #ifndef NDEBUG) so that you
 // can later see where the given object was created from.
 class BASE_EXPORT StackTrace {
  public:
   // Creates a stacktrace from the current location.
   StackTrace();
 
   // Creates a stacktrace from the current location, of up to |count| entries.
   // |count| will be limited to at most |kMaxTraces|.
@@ skipping 126 matching lines @@
                          int base,
                          size_t padding);
 #endif  // defined(OS_POSIX) && !defined(OS_ANDROID)
 
 }  // namespace internal
 
 }  // namespace debug
 }  // namespace base
 
 #endif  // BASE_DEBUG_STACK_TRACE_H_