You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
118 lines
3.9 KiB
118 lines
3.9 KiB
// 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_LOCATION_H_
|
|
#define BASE_LOCATION_H_
|
|
|
|
#include <stddef.h>
|
|
|
|
#include <cassert>
|
|
#include <string>
|
|
|
|
#include "base/base_export.h"
|
|
#include "base/debug/debugging_buildflags.h"
|
|
#include "base/hash.h"
|
|
|
|
namespace base {
|
|
|
|
// Location provides basic info where of an object was constructed, or was
|
|
// significantly brought to life.
|
|
class BASE_EXPORT Location {
|
|
public:
|
|
Location();
|
|
Location(const Location& other);
|
|
|
|
// Only initializes the file name and program counter, the source information
|
|
// will be null for the strings, and -1 for the line number.
|
|
// TODO(http://crbug.com/760702) remove file name from this constructor.
|
|
Location(const char* file_name, const void* program_counter);
|
|
|
|
// 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,
|
|
const void* program_counter);
|
|
|
|
// Comparator for hash map insertion. The program counter should uniquely
|
|
// identify a location.
|
|
bool operator==(const Location& other) const {
|
|
return program_counter_ == other.program_counter_;
|
|
}
|
|
|
|
// Returns true if there is source code location info. If this is false,
|
|
// the Location object only contains a program counter or is
|
|
// default-initialized (the program counter is also null).
|
|
bool has_source_info() const { return function_name_ && file_name_; }
|
|
|
|
// Will be nullptr for default initialized Location objects and when source
|
|
// names are disabled.
|
|
const char* function_name() const { return function_name_; }
|
|
|
|
// Will be nullptr for default initialized Location objects and when source
|
|
// names are disabled.
|
|
const char* file_name() const { return file_name_; }
|
|
|
|
// Will be -1 for default initialized Location objects and when source names
|
|
// are disabled.
|
|
int line_number() const { return line_number_; }
|
|
|
|
// The address of the code generating this Location object. Should always be
|
|
// valid except for default initialized Location objects, which will be
|
|
// nullptr.
|
|
const void* program_counter() const { return program_counter_; }
|
|
|
|
// Converts to the most user-readable form possible. If function and filename
|
|
// are not available, this will return "pc:<hex address>".
|
|
std::string ToString() const;
|
|
|
|
static Location CreateFromHere(const char* file_name);
|
|
static Location CreateFromHere(const char* function_name,
|
|
const char* file_name,
|
|
int line_number);
|
|
|
|
private:
|
|
const char* function_name_ = nullptr;
|
|
const char* file_name_ = nullptr;
|
|
int line_number_ = -1;
|
|
const void* program_counter_ = nullptr;
|
|
};
|
|
|
|
BASE_EXPORT const void* GetProgramCounter();
|
|
|
|
// The macros defined here will expand to the current function.
|
|
#if BUILDFLAG(ENABLE_LOCATION_SOURCE)
|
|
|
|
// Full source information should be included.
|
|
#define FROM_HERE FROM_HERE_WITH_EXPLICIT_FUNCTION(__func__)
|
|
#define FROM_HERE_WITH_EXPLICIT_FUNCTION(function_name) \
|
|
::base::Location::CreateFromHere(function_name, __FILE__, __LINE__)
|
|
|
|
#else
|
|
|
|
// TODO(http://crbug.com/760702) remove the __FILE__ argument from these calls.
|
|
#define FROM_HERE ::base::Location::CreateFromHere(__FILE__)
|
|
#define FROM_HERE_WITH_EXPLICIT_FUNCTION(function_name) \
|
|
::base::Location::CreateFromHere(function_name, __FILE__, -1)
|
|
|
|
#endif
|
|
|
|
} // namespace base
|
|
|
|
namespace std {
|
|
|
|
// Specialization for using Location in hash tables.
|
|
template <>
|
|
struct hash<::base::Location> {
|
|
std::size_t operator()(const ::base::Location& loc) const {
|
|
const void* program_counter = loc.program_counter();
|
|
return base::Hash(&program_counter, sizeof(void*));
|
|
}
|
|
};
|
|
|
|
} // namespace std
|
|
|
|
#endif // BASE_LOCATION_H_
|