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95 lines
3.4 KiB
C++
95 lines
3.4 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_LOCATION_H_
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#define BASE_LOCATION_H_
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#include <string>
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#include "base/base_export.h"
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#include "base/basictypes.h"
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namespace tracked_objects {
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// Location provides basic info where of an object was constructed, or was
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// significantly brought to life.
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class BASE_EXPORT Location {
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public:
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// Constructor should be called with a long-lived char*, such as __FILE__.
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// It assumes the provided value will persist as a global constant, and it
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// will not make a copy of it.
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Location(const char* function_name,
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const char* file_name,
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int line_number,
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const void* program_counter);
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// Provide a default constructor for easy of debugging.
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Location();
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// Comparison operator for insertion into a std::map<> hash tables.
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// All we need is *some* (any) hashing distinction. Strings should already
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// be unique, so we don't bother with strcmp or such.
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// Use line number as the primary key (because it is fast, and usually gets us
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// a difference), and then pointers as secondary keys (just to get some
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// distinctions).
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bool operator < (const Location& other) const {
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if (line_number_ != other.line_number_)
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return line_number_ < other.line_number_;
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if (file_name_ != other.file_name_)
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return file_name_ < other.file_name_;
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return function_name_ < other.function_name_;
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}
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const char* function_name() const { return function_name_; }
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const char* file_name() const { return file_name_; }
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int line_number() const { return line_number_; }
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const void* program_counter() const { return program_counter_; }
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std::string ToString() const;
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// Translate the some of the state in this instance into a human readable
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// string with HTML characters in the function names escaped, and append that
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// string to |output|. Inclusion of the file_name_ and function_name_ are
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// optional, and controlled by the boolean arguments.
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void Write(bool display_filename, bool display_function_name,
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std::string* output) const;
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// Write function_name_ in HTML with '<' and '>' properly encoded.
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void WriteFunctionName(std::string* output) const;
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private:
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const char* function_name_;
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const char* file_name_;
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int line_number_;
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const void* program_counter_;
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};
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// A "snapshotted" representation of the Location class that can safely be
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// passed across process boundaries.
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struct BASE_EXPORT LocationSnapshot {
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// The default constructor is exposed to support the IPC serialization macros.
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LocationSnapshot();
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explicit LocationSnapshot(const tracked_objects::Location& location);
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~LocationSnapshot();
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std::string file_name;
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std::string function_name;
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int line_number;
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};
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BASE_EXPORT const void* GetProgramCounter();
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// Define a macro to record the current source location.
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#define FROM_HERE FROM_HERE_WITH_EXPLICIT_FUNCTION(__FUNCTION__)
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#define FROM_HERE_WITH_EXPLICIT_FUNCTION(function_name) \
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::tracked_objects::Location(function_name, \
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__FILE__, \
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__LINE__, \
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::tracked_objects::GetProgramCounter())
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} // namespace tracked_objects
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#endif // BASE_LOCATION_H_
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