Update the tcmalloc chromium branch to r144 (gperftools 2.0), and merge chromium-specific changes.

third_party/tcmalloc/chromium/src/google/heap-checker.h

 // Copyright (c) 2005, 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.
 
-// ---
-// Author: Maxim Lifantsev (with design ideas by Sanjay Ghemawat)
-//
-//
-// Module for detecing heap (memory) leaks.
-//
-// For full(er) information, see doc/heap_checker.html
-//
-// This module can be linked into programs with
-// no slowdown caused by this unless you activate the leak-checker:
-//
-//    1. Set the environment variable HEAPCHEK to _type_ before
-//       running the program.
-//
-// _type_ is usually "normal" but can also be "minimal", "strict", or
-// "draconian".  (See the html file for other options, like 'local'.)
-//
-// After that, just run your binary.  If the heap-checker detects
-// a memory leak at program-exit, it will print instructions on how
-// to track down the leak.
-
-#ifndef BASE_HEAP_CHECKER_H_
-#define BASE_HEAP_CHECKER_H_
-
-#include <sys/types.h>  // for size_t
-// I can't #include config.h in this public API file, but I should
-// really use configure (and make malloc_extension.h a .in file) to
-// figure out if the system has stdint.h or not.  But I'm lazy, so
-// for now I'm assuming it's a problem only with MSVC.
-#ifndef _MSC_VER
-#include <stdint.h>     // for uintptr_t
-#endif
-#include <stdarg.h>     // for va_list
-#include <vector>
-
-// Annoying stuff for windows -- makes sure clients can import these functions
-#ifndef PERFTOOLS_DLL_DECL
-# ifdef _WIN32
-#   define PERFTOOLS_DLL_DECL  __declspec(dllimport)
-# else
-#   define PERFTOOLS_DLL_DECL
-# endif
-#endif
-
-
-// The class is thread-safe with respect to all the provided static methods,
-// as well as HeapLeakChecker objects: they can be accessed by multiple threads.
-class PERFTOOLS_DLL_DECL HeapLeakChecker {
- public:
-
-  // ----------------------------------------------------------------------- //
-  // Static functions for working with (whole-program) leak checking.
-
-  // If heap leak checking is currently active in some mode
-  // e.g. if leak checking was started (and is still active now)
-  // due to HEAPCHECK=... defined in the environment.
-  // The return value reflects iff HeapLeakChecker objects manually
-  // constructed right now will be doing leak checking or nothing.
-  // Note that we can go from active to inactive state during InitGoogle()
-  // if FLAGS_heap_check gets set to "" by some code before/during InitGoogle().
-  static bool IsActive();
-
-  // Return pointer to the whole-program checker if it has been created
-  // and NULL otherwise.
-  // Once GlobalChecker() returns non-NULL that object will not disappear and
-  // will be returned by all later GlobalChecker calls.
-  // This is mainly to access BytesLeaked() and ObjectsLeaked() (see below)
-  // for the whole-program checker after one calls NoGlobalLeaks()
-  // or similar and gets false.
-  static HeapLeakChecker* GlobalChecker();
-
-  // Do whole-program leak check now (if it was activated for this binary);
-  // return false only if it was activated and has failed.
-  // The mode of the check is controlled by the command-line flags.
-  // This method can be called repeatedly.
-  // Things like GlobalChecker()->SameHeap() can also be called explicitly
-  // to do the desired flavor of the check.
-  static bool NoGlobalLeaks();
-
-  // If whole-program checker if active,
-  // cancel its automatic execution after main() exits.
-  // This requires that some leak check (e.g. NoGlobalLeaks())
-  // has been called at least once on the whole-program checker.
-  static void CancelGlobalCheck();
-
-  // ----------------------------------------------------------------------- //
-  // Non-static functions for starting and doing leak checking.
-
-  // Start checking and name the leak check performed.
-  // The name is used in naming dumped profiles
-  // and needs to be unique only within your binary.
-  // It must also be a string that can be a part of a file name,
-  // in particular not contain path expressions.
-  explicit HeapLeakChecker(const char *name);
-
-  // Destructor (verifies that some *NoLeaks or *SameHeap method
-  // has been called at least once).
-  ~HeapLeakChecker();
-
-  // These used to be different but are all the same now: they return
-  // true iff all memory allocated since this HeapLeakChecker object
-  // was constructor is still reachable from global state.
-  //
-  // Because we fork to convert addresses to symbol-names, and forking
-  // is not thread-safe, and we may be called in a threaded context,
-  // we do not try to symbolize addresses when called manually.
-  bool NoLeaks() { return DoNoLeaks(DO_NOT_SYMBOLIZE); }
-
-  // These forms are obsolete; use NoLeaks() instead.
-  // TODO(csilvers): mark as DEPRECATED.
-  bool QuickNoLeaks()  { return NoLeaks(); }
-  bool BriefNoLeaks()  { return NoLeaks(); }
-  bool SameHeap()      { return NoLeaks(); }
-  bool QuickSameHeap() { return NoLeaks(); }
-  bool BriefSameHeap() { return NoLeaks(); }
-
-  // Detailed information about the number of leaked bytes and objects
-  // (both of these can be negative as well).
-  // These are available only after a *SameHeap or *NoLeaks
-  // method has been called.
-  // Note that it's possible for both of these to be zero
-  // while SameHeap() or NoLeaks() returned false in case
-  // of a heap state change that is significant
-  // but preserves the byte and object counts.
-  ssize_t BytesLeaked() const;
-  ssize_t ObjectsLeaked() const;
-
-  // ----------------------------------------------------------------------- //
-  // Static helpers to make us ignore certain leaks.
-
-  // Scoped helper class.  Should be allocated on the stack inside a
-  // block of code.  Any heap allocations done in the code block
-  // covered by the scoped object (including in nested function calls
-  // done by the code block) will not be reported as leaks.  This is
-  // the recommended replacement for the GetDisableChecksStart() and
-  // DisableChecksToHereFrom() routines below.
-  //
-  // Example:
-  //   void Foo() {
-  //     HeapLeakChecker::Disabler disabler;
-  //     ... code that allocates objects whose leaks should be ignored ...
-  //   }
-  //
-  // REQUIRES: Destructor runs in same thread as constructor
-  class Disabler {
-   public:
-    Disabler();
-    ~Disabler();
-   private:
-    Disabler(const Disabler&);        // disallow copy
-    void operator=(const Disabler&);  // and assign
-  };
-
-  // Ignore an object located at 'ptr' (can go at the start or into the object)
-  // as well as all heap objects (transitively) referenced from it
-  // for the purposes of heap leak checking.
-  // If 'ptr' does not point to an active allocated object
-  // at the time of this call, it is ignored;
-  // but if it does, the object must not get deleted from the heap later on;
-  // it must also be not already ignored at the time of this call.
-  //
-  // See also HiddenPointer, below, if you need to prevent a pointer from
-  // being traversed by the heap checker but do not wish to transitively
-  // whitelist objects referenced through it.
-  static void IgnoreObject(const void* ptr);
-
-  // Undo what an earlier IgnoreObject() call promised and asked to do.
-  // At the time of this call 'ptr' must point at or inside of an active
-  // allocated object which was previously registered with IgnoreObject().
-  static void UnIgnoreObject(const void* ptr);
-
-  // ----------------------------------------------------------------------- //
-  // Initialization; to be called from main() only.
-
-  // Full starting of recommended whole-program checking.
-  static void InternalInitStart();
-
-  // ----------------------------------------------------------------------- //
-  // Internal types defined in .cc
-
-  class Allocator;
-  struct RangeValue;
-
- private:
-
-  // ----------------------------------------------------------------------- //
-  // Various helpers
-
-  // Create the name of the heap profile file.
-  // Should be deleted via Allocator::Free().
-  char* MakeProfileNameLocked();
-
-  // Helper for constructors
-  void Create(const char *name, bool make_start_snapshot);
-
-  enum ShouldSymbolize { SYMBOLIZE, DO_NOT_SYMBOLIZE };
-
-  // Helper for *NoLeaks and *SameHeap
-  bool DoNoLeaks(ShouldSymbolize should_symbolize);
-
-  // These used to be public, but they are now deprecated.
-  // Will remove entirely when all internal uses are fixed.
-  // In the meantime, use friendship so the unittest can still test them.
-  static void* GetDisableChecksStart();
-  static void DisableChecksToHereFrom(const void* start_address);
-  static void DisableChecksIn(const char* pattern);
-  friend void RangeDisabledLeaks();
-  friend void NamedTwoDisabledLeaks();
-  friend void* RunNamedDisabledLeaks(void*);
-  friend void TestHeapLeakCheckerNamedDisabling();
-  friend int main(int, char**);
-
-
-  // Helper for DisableChecksIn
-  static void DisableChecksInLocked(const char* pattern);
-
-  // Disable checks based on stack trace entry at a depth <=
-  // max_depth.  Used to hide allocations done inside some special
-  // libraries.
-  static void DisableChecksFromToLocked(const void* start_address,
-                                        const void* end_address,
-                                        int max_depth);
-
-  // Helper for DoNoLeaks to ignore all objects reachable from all live data
-  static void IgnoreAllLiveObjectsLocked(const void* self_stack_top);
-
-  // Callback we pass to ListAllProcessThreads (see thread_lister.h)
-  // that is invoked when all threads of our process are found and stopped.
-  // The call back does the things needed to ignore live data reachable from
-  // thread stacks and registers for all our threads
-  // as well as do other global-live-data ignoring
-  // (via IgnoreNonThreadLiveObjectsLocked)
-  // during the quiet state of all threads being stopped.
-  // For the argument meaning see the comment by ListAllProcessThreads.
-  // Here we only use num_threads and thread_pids, that ListAllProcessThreads
-  // fills for us with the number and pids of all the threads of our process
-  // it found and attached to.
-  static int IgnoreLiveThreadsLocked(void* parameter,
-                                     int num_threads,
-                                     pid_t* thread_pids,
-                                     va_list ap);
-
-  // Helper for IgnoreAllLiveObjectsLocked and IgnoreLiveThreadsLocked
-  // that we prefer to execute from IgnoreLiveThreadsLocked
-  // while all threads are stopped.
-  // This helper does live object discovery and ignoring
-  // for all objects that are reachable from everything
-  // not related to thread stacks and registers.
-  static void IgnoreNonThreadLiveObjectsLocked();
-
-  // Helper for IgnoreNonThreadLiveObjectsLocked and IgnoreLiveThreadsLocked
-  // to discover and ignore all heap objects
-  // reachable from currently considered live objects
-  // (live_objects static global variable in out .cc file).
-  // "name", "name2" are two strings that we print one after another
-  // in a debug message to describe what kind of live object sources
-  // are being used.
-  static void IgnoreLiveObjectsLocked(const char* name, const char* name2);
-
-  // Runs REGISTER_HEAPCHECK_CLEANUP cleanups and potentially
-  // calls DoMainHeapCheck
-  static void RunHeapCleanups();
-
-  // Do the overall whole-program heap leak check if needed;
-  // returns true when did the leak check.
-  static bool DoMainHeapCheck();
-
-  // Type of task for UseProcMapsLocked
-  enum ProcMapsTask {
-    RECORD_GLOBAL_DATA,
-    DISABLE_LIBRARY_ALLOCS
-  };
-
-  // Success/Error Return codes for UseProcMapsLocked.
-  enum ProcMapsResult {
-    PROC_MAPS_USED,
-    CANT_OPEN_PROC_MAPS,
-    NO_SHARED_LIBS_IN_PROC_MAPS
-  };
-
-  // Read /proc/self/maps, parse it, and do the 'proc_maps_task' for each line.
-  static ProcMapsResult UseProcMapsLocked(ProcMapsTask proc_maps_task);
-
-  // A ProcMapsTask to disable allocations from 'library'
-  // that is mapped to [start_address..end_address)
-  // (only if library is a certain system library).
-  static void DisableLibraryAllocsLocked(const char* library,
-                                         uintptr_t start_address,
-                                         uintptr_t end_address);
-
-  // Return true iff "*ptr" points to a heap object
-  // ("*ptr" can point at the start or inside of a heap object
-  //  so that this works e.g. for pointers to C++ arrays, C++ strings,
-  //  multiple-inherited objects, or pointers to members).
-  // We also fill *object_size for this object then
-  // and we move "*ptr" to point to the very start of the heap object.
-  static inline bool HaveOnHeapLocked(const void** ptr, size_t* object_size);
-
-  // Helper to shutdown heap leak checker when it's not needed
-  // or can't function properly.
-  static void TurnItselfOffLocked();
-
-  // Internally-used c-tor to start whole-executable checking.
-  HeapLeakChecker();
-
-  // ----------------------------------------------------------------------- //
-  // Friends and externally accessed helpers.
-
-  // Helper for VerifyHeapProfileTableStackGet in the unittest
-  // to get the recorded allocation caller for ptr,
-  // which must be a heap object.
-  static const void* GetAllocCaller(void* ptr);
-  friend void VerifyHeapProfileTableStackGet();
-
-  // This gets to execute before constructors for all global objects
-  static void BeforeConstructorsLocked();
-  friend void HeapLeakChecker_BeforeConstructors();
-
-  // This gets to execute after destructors for all global objects
-  friend void HeapLeakChecker_AfterDestructors();
-
-  // ----------------------------------------------------------------------- //
-  // Member data.
-
-  class SpinLock* lock_;  // to make HeapLeakChecker objects thread-safe
-  const char* name_;  // our remembered name (we own it)
-                      // NULL means this leak checker is a noop
-
-  // Snapshot taken when the checker was created.  May be NULL
-  // for the global heap checker object.  We use void* instead of
-  // HeapProfileTable::Snapshot* to avoid including heap-profile-table.h.
-  void* start_snapshot_;
-
-  bool has_checked_;  // if we have done the leak check, so these are ready:
-  ssize_t inuse_bytes_increase_;  // bytes-in-use increase for this checker
-  ssize_t inuse_allocs_increase_;  // allocations-in-use increase
-                                   // for this checker
-  bool keep_profiles_;  // iff we should keep the heap profiles we've made
-
-  // ----------------------------------------------------------------------- //
-
-  // Disallow "evil" constructors.
-  HeapLeakChecker(const HeapLeakChecker&);
-  void operator=(const HeapLeakChecker&);
-};
-
-
-// Holds a pointer that will not be traversed by the heap checker.
-// Contrast with HeapLeakChecker::IgnoreObject(o), in which o and
-// all objects reachable from o are ignored by the heap checker.
-template <class T>
-class HiddenPointer {
- public:
-  explicit HiddenPointer(T* t)
-      : masked_t_(reinterpret_cast<uintptr_t>(t) ^ kHideMask) {
-  }
-  // Returns unhidden pointer.  Be careful where you save the result.
-  T* get() const { return reinterpret_cast<T*>(masked_t_ ^ kHideMask); }
-
- private:
-  // Arbitrary value, but not such that xor'ing with it is likely
-  // to map one valid pointer to another valid pointer:
-  static const uintptr_t kHideMask =
-      static_cast<uintptr_t>(0xF03A5F7BF03A5F7Bll);
-  uintptr_t masked_t_;
-};
-
-// A class that exists solely to run its destructor.  This class should not be
-// used directly, but instead by the REGISTER_HEAPCHECK_CLEANUP macro below.
-class PERFTOOLS_DLL_DECL HeapCleaner {
- public:
-  typedef void (*void_function)(void);
-  HeapCleaner(void_function f);
-  static void RunHeapCleanups();
- private:
-  static std::vector<void_function>* heap_cleanups_;
-};
-
-// A macro to declare module heap check cleanup tasks
-// (they run only if we are doing heap leak checking.)
-// 'body' should be the cleanup code to run.  'name' doesn't matter,
-// but must be unique amongst all REGISTER_HEAPCHECK_CLEANUP calls.
-#define REGISTER_HEAPCHECK_CLEANUP(name, body)  \
-  namespace { \
-  void heapcheck_cleanup_##name() { body; } \
-  static HeapCleaner heapcheck_cleaner_##name(&heapcheck_cleanup_##name); \
-  }
-
-#endif  // BASE_HEAP_CHECKER_H_
+/* The code has moved to gperftools/.  Use that include-directory for
+ * new code.
+ */
+#include <gperftools/heap-checker.h>