// 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: Sanjay Ghemawat <opensource@google.com>
//
// Internal logging and related utility routines.
#ifndef TCMALLOC_INTERNAL_LOGGING_H_
#define TCMALLOC_INTERNAL_LOGGING_H_
#include <config.h>
#include <stddef.h> // for size_t
#if defined HAVE_STDINT_H
#include <stdint.h>
#elif defined HAVE_INTTYPES_H
#include <inttypes.h>
#else
#include <sys/types.h>
#endif
//-------------------------------------------------------------------
// Utility routines
//-------------------------------------------------------------------
// Safe logging helper: we write directly to the stderr file
// descriptor and avoid FILE buffering because that may invoke
// malloc().
//
// Example:
// Log(kLog, __FILE__, __LINE__, "error", bytes);
namespace tcmalloc {
enum LogMode {
kLog, // Just print the message
kCrash, // Print the message and crash
kCrashWithStats // Print the message, some stats, and crash
};
class Logger;
// A LogItem holds any of the argument types that can be passed to Log()
class LogItem {
public:
LogItem() : tag_(kEnd) { }
LogItem(const char* v) : tag_(kStr) { u_.str = v; }
LogItem(int v) : tag_(kSigned) { u_.snum = v; }
LogItem(long v) : tag_(kSigned) { u_.snum = v; }
LogItem(long long v) : tag_(kSigned) { u_.snum = v; }
LogItem(unsigned int v) : tag_(kUnsigned) { u_.unum = v; }
LogItem(unsigned long v) : tag_(kUnsigned) { u_.unum = v; }
LogItem(unsigned long long v) : tag_(kUnsigned) { u_.unum = v; }
LogItem(const void* v) : tag_(kPtr) { u_.ptr = v; }
private:
friend class Logger;
enum Tag {
kStr,
kSigned,
kUnsigned,
kPtr,
kEnd
};
Tag tag_;
union {
const char* str;
const void* ptr;
int64_t snum;
uint64_t unum;
} u_;
};
extern PERFTOOLS_DLL_DECL void Log(LogMode mode, const char* filename, int line,
LogItem a, LogItem b = LogItem(),
LogItem c = LogItem(), LogItem d = LogItem());
// Tests can override this function to collect logging messages.
extern PERFTOOLS_DLL_DECL void (*log_message_writer)(const char* msg, int length);
} // end tcmalloc namespace
// Like assert(), but executed even in NDEBUG mode
#undef CHECK_CONDITION
#define CHECK_CONDITION(cond) \
do { \
if (!(cond)) { \
::tcmalloc::Log(::tcmalloc::kCrash, __FILE__, __LINE__, #cond); \
} \
} while (0)
// Our own version of assert() so we can avoid hanging by trying to do
// all kinds of goofy printing while holding the malloc lock.
#ifndef NDEBUG
#define ASSERT(cond) CHECK_CONDITION(cond)
#else
#define ASSERT(cond) ((void) 0)
#endif
// Print into buffer
class TCMalloc_Printer {
private:
char* buf_; // Where should we write next
int left_; // Space left in buffer (including space for \0)
public:
// REQUIRES: "length > 0"
TCMalloc_Printer(char* buf, int length) : buf_(buf), left_(length) {
buf[0] = '\0';
}
void printf(const char* format, ...)
#ifdef HAVE___ATTRIBUTE__
__attribute__ ((__format__ (__printf__, 2, 3)))
#endif
;
};
#endif // TCMALLOC_INTERNAL_LOGGING_H_