Allocator cleanup: allocator_extension call directly into tcmalloc

base/debug/profiler.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_PROFILER_H_
 #define BASE_DEBUG_PROFILER_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 20 matching lines @@
 
 // Returns true if process is being profiled.
 BASE_EXPORT bool BeingProfiled();
 
 // Reset profiling after a fork, which disables timers.
 BASE_EXPORT void RestartProfilingAfterFork();
 
 // Returns true iff this executable is instrumented with the Syzygy profiler.
 BASE_EXPORT bool IsBinaryInstrumented();
 
+// Returns true iff this executable supports profiling.
+BASE_EXPORT bool IsProfilingSupported();
+
 // There's a class of profilers that use "return address swizzling" to get a
 // hook on function exits. This class of profilers uses some form of entry hook,
 // like e.g. binary instrumentation, or a compiler flag, that calls a hook each
 // time a function is invoked. The hook then switches the return address on the
 // stack for the address of an exit hook function, and pushes the original
 // return address to a shadow stack of some type. When in due course the CPU
 // executes a return to the exit hook, the exit hook will do whatever work it
 // does on function exit, then arrange to return to the original return address.
 // This class of profiler does not play well with programs that look at the
 // return address, as does e.g. V8. V8 uses the return address to certain
@@ skipping 31 matching lines @@
 // Otherwise returns NULL.
 BASE_EXPORT ReturnAddressLocationResolver GetProfilerReturnAddrResolutionFunc();
 BASE_EXPORT DynamicFunctionEntryHook GetProfilerDynamicFunctionEntryHookFunc();
 BASE_EXPORT AddDynamicSymbol GetProfilerAddDynamicSymbolFunc();
 BASE_EXPORT MoveDynamicSymbol GetProfilerMoveDynamicSymbolFunc();
 
 }  // namespace debug
 }  // namespace base
 
 #endif  // BASE_DEBUG_PROFILER_H_