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// Copyright 2008, 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.
//------------------------------------------------------------------------------
// Tracked is the base class for all tracked objects. During construction, it
// registers the fact that an instance was created, and at destruction time, it
// records that event. The instance may be tagged with a name, which is refered
// to as its Location. The Location is a file and line number, most
// typically indicated where the object was constructed. In some cases, as the
// object's significance is refined (for example, a Task object is augmented to
// do additonal things), its Location may be redefined to that later location.
// Tracking includes (for each instance) recording the birth thread, death
// thread, and duration of life (from construction to destruction). All this
// data is accumulated and filtered for review at about:objects.
#ifndef BASE_TRACKED_H__
#define BASE_TRACKED_H__
#include <string>
#include "base/time.h"
#ifndef NDEBUG
#define TRACK_ALL_TASK_OBJECTS
#endif
namespace tracked_objects {
//------------------------------------------------------------------------------
// Location provides basic info where of an object was constructed, or was
// significantly brought to life.
class Location {
public:
// Constructor should be called with a long-lived char*, such as __FILE__.
// It assumes the provided value will persist as a global constant, and it
// will not make a copy of it.
Location(const char* function_name, const char* file_name, int line_number)
: function_name_(function_name),
file_name_(file_name),
line_number_(line_number) { }
// Provide a default constructor for easy of debugging.
Location()
: function_name_("Unknown"),
file_name_("Unknown"),
line_number_(-1) { }
// Comparison operator for insertion into a std::map<> hash tables.
// All we need is *some* (any) hashing distinction. Strings should already
// be unique, so we don't bother with strcmp or such.
// Use line number as the primary key (because it is fast, and usually gets us
// a difference), and then pointers as secondary keys (just to get some
// distinctions).
bool operator < (const Location& other) const {
if (line_number_ != other.line_number_)
return line_number_ < other.line_number_;
if (file_name_ != other.file_name_)
return file_name_ != other.file_name_;
return function_name_ < other.function_name_;
}
const char* function_name() const { return function_name_; }
const char* file_name() const { return file_name_; }
int line_number() const { return line_number_; }
void Write(bool display_filename, bool display_function_name,
std::string* output) const;
// Write function_name_ in HTML with '<' and '>' properly encoded.
void WriteFunctionName(std::string* output) const;
private:
const char* const function_name_;
const char* const file_name_;
const int line_number_;
};
//------------------------------------------------------------------------------
class Births;
class Tracked {
public:
Tracked();
virtual ~Tracked();
void SetBirthPlace(const Location& from_here);
bool MissingBirthplace() const;
private:
Births* tracked_births_; // At same birthplace, and same thread.
const Time tracked_birth_time_;
DISALLOW_EVIL_CONSTRUCTORS(Tracked);
};
} // namespace tracked_objects
#endif // BASE_TRACKED_H__
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