mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-11-24 22:36:09 +03:00
44 lines
1.8 KiB
C++
44 lines
1.8 KiB
C++
// Copyright (c) 2011 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_ALIAS_H_
|
|
#define BASE_DEBUG_ALIAS_H_
|
|
|
|
#include "base/base_export.h"
|
|
#include "base/strings/string_util.h"
|
|
|
|
namespace base {
|
|
namespace debug {
|
|
|
|
// Make the optimizer think that var is aliased. This is to prevent it from
|
|
// optimizing out local variables that would not otherwise be live at the point
|
|
// of a potential crash.
|
|
// base::debug::Alias should only be used for local variables, not globals,
|
|
// object members, or function return values - these must be copied to locals if
|
|
// you want to ensure they are recorded in crash dumps.
|
|
// Note that if the local variable is a pointer then its value will be retained
|
|
// but the memory that it points to will probably not be saved in the crash
|
|
// dump - by default only stack memory is saved. Therefore the aliasing
|
|
// technique is usually only worthwhile with non-pointer variables. If you have
|
|
// a pointer to an object and you want to retain the object's state you need to
|
|
// copy the object or its fields to local variables. Example usage:
|
|
// int last_error = err_;
|
|
// base::debug::Alias(&last_error);
|
|
// DEBUG_ALIAS_FOR_CSTR(name_copy, p->name, 16);
|
|
// CHECK(false);
|
|
void BASE_EXPORT Alias(const void* var);
|
|
|
|
} // namespace debug
|
|
} // namespace base
|
|
|
|
// Convenience macro that copies the null-terminated string from |c_str| into a
|
|
// stack-allocated char array named |var_name| that holds up to |char_count|
|
|
// characters and should be preserved in memory dumps.
|
|
#define DEBUG_ALIAS_FOR_CSTR(var_name, c_str, char_count) \
|
|
char var_name[char_count]; \
|
|
::base::strlcpy(var_name, (c_str), arraysize(var_name)); \
|
|
::base::debug::Alias(var_name);
|
|
|
|
#endif // BASE_DEBUG_ALIAS_H_
|