path: root/src/debug/debug_new.cpp

// -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
// vim:tabstop=4:shiftwidth=4:expandtab:

/*
 * Copyright (C) 2004-2008 Wu Yongwei <adah at users dot sourceforge dot net>
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any
 * damages arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute
 * it freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must
 *    not claim that you wrote the original software.  If you use this
 *    software in a product, an acknowledgement in the product
 *    documentation would be appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must
 *    not be misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source
 *    distribution.
 *
 * This file is part of Stones of Nvwa:
 *      http://sourceforge.net/projects/nvwa
 *
 * original version changed for ManaPlus
 *
 * Copyright (C) 2011-2016  The ManaPlus Developers
 */

/**
 * @file    debug_new.cpp
 *
 * Implementation of debug versions of new and delete to check leakage.
 *
 * @version 4.14, 2008/10/20
 * @author  Wu Yongwei
 *
 */

#ifdef ENABLE_MEM_DEBUG
#include <new>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#ifdef __unix__
#include <alloca.h>
#endif
#ifdef _WIN32
#include <malloc.h>
#endif
#include "debug/fast_mutex.h"
#include "debug/static_assert.h"

#include "localconsts.h"

// #define DUMP_MEM_ADDRESSES 1

#if !_FAST_MUTEX_CHECK_INITIALIZATION && !defined(_NOTHREADS)
#error "_FAST_MUTEX_CHECK_INITIALIZATION not set: check_leaks may not work"
#endif

/**
 * @def M_DEBUG_NEW_ALIGNMENT
 *
 * The alignment requirement of allocated memory blocks.  It must be a
 * power of two.
 */
#ifndef M_DEBUG_NEW_ALIGNMENT
#define M_DEBUG_NEW_ALIGNMENT 16
#endif

/**
 * @def M_DEBUG_NEW_CALLER_ADDRESS
 *
 * The expression to return the caller address.  #print_position will
 * later on use this address to print the position information of memory
 * operation points.
 */
#ifndef M_DEBUG_NEW_CALLER_ADDRESS
#ifdef __GNUC__
#define M_DEBUG_NEW_CALLER_ADDRESS __builtin_return_address(0)
#else
#define M_DEBUG_NEW_CALLER_ADDRESS NULL
#endif
#endif

/**
 * @def M_DEBUG_NEW_ERROR_ACTION
 *
 * The action to take when an error occurs.  The default behaviour is to
 * call \e abort, unless \c M_DEBUG_NEW_ERROR_CRASH is defined, in which
 * case a segmentation fault will be triggered instead (which can be
 * useful on platforms like Windows that do not generate a core dump
 * when \e abort is called).
 */
#ifndef M_DEBUG_NEW_ERROR_ACTION
#ifndef M_DEBUG_NEW_ERROR_CRASH
#define M_DEBUG_NEW_ERROR_ACTION abort()
#else
#define M_DEBUG_NEW_ERROR_ACTION do { *((char*)0) = 0; abort(); } while (0)
#endif
#endif

/**
 * @def M_DEBUG_NEW_FILENAME_LEN
 *
 * The length of file name stored if greater than zero.  If it is zero,
 * only a const char pointer will be stored.  Currently the default
 * behaviour is to copy the file name, because I found that the exit
 * leakage check cannot access the address of the file name sometimes
 * (in my case, a core dump will occur when trying to access the file
 * name in a shared library after a \c SIGINT).  The current default
 * value makes the size of new_ptr_list_t 64 on 32-bit platforms.
 */
#ifndef M_DEBUG_NEW_FILENAME_LEN
#define M_DEBUG_NEW_FILENAME_LEN 100
#endif

/**
 * @def M_DEBUG_NEW_PROGNAME
 *
 * The program (executable) name to be set at compile time.  It is
 * better to assign the full program path to #new_progname in \e main
 * (at run time) than to use this (compile-time) macro, but this macro
 * serves well as a quick hack.  Note also that double quotation marks
 * need to be used around the program name, i.e., one should specify a
 * command-line option like <code>-DM_DEBUG_NEW_PROGNAME=\"a.out\"</code>
 * in \e bash, or <code>-DM_DEBUG_NEW_PROGNAME=\"a.exe\"</code> in the
 * Windows command prompt.
 */
#ifndef M_DEBUG_NEW_PROGNAME
#define M_DEBUG_NEW_PROGNAME nullptr
#endif

/**
 * @def M_DEBUG_NEW_STD_OPER_NEW
 *
 * Macro to indicate whether the standard-conformant behaviour of
 * <code>operator new</code> is wanted.  It is on by default now, but
 * the user may set it to \c 0 to revert to the old behaviour.
 */
#ifndef M_DEBUG_NEW_STD_OPER_NEW
#define M_DEBUG_NEW_STD_OPER_NEW 1
#endif

/**
 * @def M_DEBUG_NEW_TAILCHECK
 *
 * Macro to indicate whether a writing-past-end check will be performed.
 * Define it to a positive integer as the number of padding bytes at the
 * end of a memory block for checking.
 */
#ifndef M_DEBUG_NEW_TAILCHECK
#define M_DEBUG_NEW_TAILCHECK 0
#endif

/**
 * @def M_DEBUG_NEW_TAILCHECK_CHAR
 *
 * Value of the padding bytes at the end of a memory block.
 */
// #ifndef M_DEBUG_NEW_TAILCHECK_CHAR
// #define M_DEBUG_NEW_TAILCHECK_CHAR 0xCC
// #endif

/**
 * @def M_DEBUG_NEW_USE_ADDR2LINE
 *
 * Whether to use \e addr2line to convert a caller address to file/line
 * information.  Defining it to a non-zero value will enable the
 * conversion (automatically done if GCC is detected).  Defining it to
 * zero will disable the conversion.
 */
#ifndef M_DEBUG_NEW_USE_ADDR2LINE
#ifdef __GNUC__
#define M_DEBUG_NEW_USE_ADDR2LINE 1
#else
#define M_DEBUG_NEW_USE_ADDR2LINE 0
#endif
#endif

#ifdef _MSC_VER
#pragma warning(disable: 4073)  // #pragma init_seg(lib) used
#pragma warning(disable: 4290)  // C++ exception specification ignored
#pragma init_seg(lib)
#endif

#undef  M_DEBUG_NEW_EMULATE_MALLOC
#undef  M_DEBUG_NEW_REDEFINE_NEW
/**
 * Macro to indicate whether redefinition of \c new is wanted.  Here it
 * is defined to \c 0 to disable the redefinition of \c new.
 */
#define M_DEBUG_NEW_REDEFINE_NEW 0
#include "debug/debug_new.h"

/**
 * Gets the aligned value of memory block size.
 */
#define align(s) \
        (((s) + M_DEBUG_NEW_ALIGNMENT - 1) & ~(M_DEBUG_NEW_ALIGNMENT - 1))

/**
 * Structure to store the position information where \c new occurs.
 */
struct new_ptr_list_t
{
    new_ptr_list_t*     next;
    new_ptr_list_t*     prev;
    size_t              size;
    union
    {
#if M_DEBUG_NEW_FILENAME_LEN == 0
    const char*         file;
#else
    char                file[M_DEBUG_NEW_FILENAME_LEN];
#endif
    void*               addr;
    };
    unsigned            line      :31;
    unsigned            is_array  :1;
    unsigned            magic;
    unsigned            dumped;
};

/**
 * Magic number for error detection.
 */
const unsigned MAGIC = 0x4442474E;

/**
 * The extra memory allocated by <code>operator new</code>.
 */
const int ALIGNED_LIST_ITEM_SIZE = align(sizeof(new_ptr_list_t));

/**
 * List of all new'd pointers.
 */
static new_ptr_list_t new_ptr_list =
{
    &new_ptr_list,
    &new_ptr_list,
    0,
    {
#if M_DEBUG_NEW_FILENAME_LEN == 0
        NULL
#else
        ""
#endif
    },
    0,
    0,
    MAGIC,
    false
};

/**
 * The mutex guard to protect simultaneous access to the pointer list.
 */
static fast_mutex new_ptr_lock;

/**
 * The mutex guard to protect simultaneous output to #new_output_fp.
 */
static fast_mutex new_output_lock;

/**
 * Total memory allocated in bytes.
 */
static size_t total_mem_alloc = 0;

/**
 * Flag to control whether #check_leaks will be automatically called on
 * program exit.
 */
bool new_autocheck_flag = true;

/**
 * Flag to control whether verbose messages are output.
 */
bool new_verbose_flag = false;

/**
 * Pointer to the output stream.  The default output is \e stderr, and
 * one may change it to a user stream if needed (say, #new_verbose_flag
 * is \c true and there are a lot of (de)allocations).
 */
FILE* new_output_fp = stderr;

/**
 * Pointer to the program name.  Its initial value is the macro
 * #M_DEBUG_NEW_PROGNAME.  You should try to assign the program path to
 * it early in your application.  Assigning <code>argv[0]</code> to it
 * in \e main is one way.  If you use \e bash or \e ksh (or similar),
 * the following statement is probably what you want:
 * `<code>new_progname = getenv("_");</code>'.
 */
const char* new_progname = M_DEBUG_NEW_PROGNAME;

#if M_DEBUG_NEW_USE_ADDR2LINE
/**
 * Tries printing the position information from an instruction address.
 * This is the version that uses \e addr2line.
 *
 * @param addr  the instruction address to convert and print
 * @return      \c true if the address is converted successfully (and
 *              the result is printed); \c false if no useful
 *              information is got (and nothing is printed)
 */
static bool print_position_from_addr(const void* addr)
{
    static const void* last_addr = nullptr;
    static char last_info[256] = "";
    if (addr == last_addr)
    {
        if (last_info[0] == '\0')
            return false;
        fprintf(new_output_fp, "%s", last_info);
        return true;
    }
    if (new_progname)
    {
        const char addr2line_cmd[] = "addr2line -e ";
#if   defined(__CYGWIN__) || defined(_WIN32)
        const int  exeext_len = 4;
#else
        const int  exeext_len = 0;
#endif
#if  !defined(__CYGWIN__) && defined(__unix__)
        const char ignore_err[] = " 2>/dev/null";
#elif defined(__CYGWIN__) || \
        (defined(_WIN32) && defined(WINVER) && WINVER >= 0x0500)
        const char ignore_err[] = " 2>nul";
#else
        const char ignore_err[] = "";
#endif
        char* cmd = static_cast<char*>(alloca(strlen(new_progname)
            + exeext_len
            + sizeof addr2line_cmd - 1
            + sizeof ignore_err - 1
            + sizeof(void*) * 2
            + 4 /* SP + "0x" + null */));
        strcpy(cmd, addr2line_cmd);
        strcpy(cmd + sizeof addr2line_cmd - 1, new_progname);
        size_t len = strlen(cmd);
#if   defined(__CYGWIN__) || defined(_WIN32)
        if (len <= 4 || (strcmp(cmd + len - 4, ".exe") != 0
            && strcmp(cmd + len - 4, ".EXE") != 0))
        {
            strcpy(cmd + len, ".exe");
            len += 4;
        }
#endif
        sprintf(cmd + len, " %p%s", addr, ignore_err);
        FILE* fp = popen(cmd, "r");
        if (fp)
        {
            char buffer[sizeof last_info] = "";
            len = 0;
            if (fgets(buffer, sizeof buffer, fp))
            {
                len = strlen(buffer);
                if (buffer[len - 1] == '\n')
                    buffer[--len] = '\0';
            }
            int res = pclose(fp);
            // Display the file/line information only if the command
            // is executed successfully and the output points to a
            // valid position, but the result will be cached if only
            // the command is executed successfully.
            if (res == 0 && len > 0)
            {
                last_addr = addr;
                if (buffer[len - 1] == '0' && buffer[len - 2] == ':')
                    last_info[0] = '\0';
                else
                {
                    fprintf(new_output_fp, "%s", buffer);
                    strcpy(last_info, buffer);
                    return true;
                }
            }
        }
    }
    return false;
}
#else
/**
 * Tries printing the position information from an instruction address.
 * This is the stub version that does nothing at all.
 *
 * @return      \c false always
 */
static bool print_position_from_addr(const void*)
{
    return false;
}
#endif  // M_DEBUG_NEW_USE_ADDR2LINE

/**
 * Prints the position information of a memory operation point.  When \c
 * M_DEBUG_NEW_USE_ADDR2LINE is defined to a non-zero value, this
 * function will try to convert a given caller address to file/line
 * information with \e addr2line.
 *
 * @param ptr   source file name if \e line is non-zero; caller address
 *              otherwise
 * @param line  source line number if non-zero; indication that \e ptr
 *              is the caller address otherwise
 */
static void print_position(const void* ptr, int line)
{
    if (line != 0)          // Is file/line information present?
    {
        fprintf(new_output_fp, "%s:%d", static_cast<const char*>(ptr), line);
    }
    else if (ptr != nullptr)   // Is caller address present?
    {
        if (!print_position_from_addr(ptr))  // Fail to get source position?
            fprintf(new_output_fp, "%p", ptr);
    }
    else                    // No information is present
    {
        fprintf(new_output_fp, "<Unknown>");
    }
}

#if M_DEBUG_NEW_TAILCHECK
/**
 * Checks whether the padding bytes at the end of a memory block is
 * tampered with.
 *
 * @param ptr   pointer to a new_ptr_list_t struct
 * @return      \c true if the padding bytes are untouched; \c false
 *              otherwise
 */
static bool check_tail(new_ptr_list_t* ptr)
{
    const unsigned char* const pointer = (unsigned char*)ptr +
        ALIGNED_LIST_ITEM_SIZE + ptr->size;
    for (int i = 0; i < M_DEBUG_NEW_TAILCHECK; ++i)
    {
        if (pointer[i] != M_DEBUG_NEW_TAILCHECK_CHAR)
            return false;
    }
    return true;
}
#endif

/**
 * Allocates memory and initializes control data.
 *
 * @param size      size of the required memory block
 * @param file      null-terminated string of the file name
 * @param line      line number
 * @param is_array  boolean value whether this is an array operation
 * @return          pointer to the user-requested memory area; \c NULL
 *                  if memory allocation is not successful
 */
static void* alloc_mem(size_t size, const char* file, int line, bool is_array)
{
    assert(line >= 0);
    STATIC_ASSERT((M_DEBUG_NEW_ALIGNMENT & (M_DEBUG_NEW_ALIGNMENT - 1)) == 0,
                  Alignment_must_be_power_of_two);
    STATIC_ASSERT(M_DEBUG_NEW_TAILCHECK >= 0, Invalid_tail_check_length);
    size_t s = size + ALIGNED_LIST_ITEM_SIZE + M_DEBUG_NEW_TAILCHECK;
    new_ptr_list_t* ptr = static_cast<new_ptr_list_t*>(malloc(s));
    if (ptr == nullptr)
    {
#if M_DEBUG_NEW_STD_OPER_NEW
        return nullptr;
#else
        fast_mutex_autolock lock(new_output_lock);
        fprintf(new_output_fp,
                "Out of memory when allocating %u bytes\n",
                size);
        fflush(new_output_fp);
        M_DEBUG_NEW_ERROR_ACTION;
#endif
    }
    void* pointer = reinterpret_cast<char*>(ptr) + ALIGNED_LIST_ITEM_SIZE;
#if M_DEBUG_NEW_FILENAME_LEN == 0
    ptr->file = file;
#else
    if (line)
    {
        strncpy(ptr->file, file, M_DEBUG_NEW_FILENAME_LEN - 1)
                [M_DEBUG_NEW_FILENAME_LEN - 1] = '\0';
    }
    else
    {
        ptr->addr = reinterpret_cast<void*>(const_cast<char*>(file));
    }
#endif
    ptr->line = line;
    ptr->is_array = is_array;
    ptr->size = size;
    ptr->magic = MAGIC;
    {
        fast_mutex_autolock lock(new_ptr_lock);
        ptr->prev = new_ptr_list.prev;
        ptr->next = &new_ptr_list;
        new_ptr_list.prev->next = ptr;
        new_ptr_list.prev = ptr;
    }
    ptr->dumped = 0;
#if M_DEBUG_NEW_TAILCHECK
    memset((char*)pointer + size, M_DEBUG_NEW_TAILCHECK_CHAR,
                                  M_DEBUG_NEW_TAILCHECK);
#endif
    if (new_verbose_flag)
    {
        fast_mutex_autolock lock(new_output_lock);
        fprintf(new_output_fp,
                "new%s: allocated %p (size %u, ",
                is_array ? "[]" : "",
                pointer, static_cast<unsigned>(size));
        if (line != 0)
            print_position(ptr->file, ptr->line);
        else
            print_position(ptr->addr, ptr->line);
        fprintf(new_output_fp, ")\n");
    }
    total_mem_alloc += size;
    return pointer;
}

/**
 * Frees memory and adjusts pointers.
 *
 * @param pointer   pointer to delete
 * @param addr      pointer to the caller
 * @param is_array  flag indicating whether it is invoked by a
 *                  <code>delete []</code> call
 */
static void free_pointer(void* pointer, void* addr, bool is_array)
{
    if (pointer == nullptr)
        return;
    new_ptr_list_t* ptr = reinterpret_cast<new_ptr_list_t*>(
        static_cast<char*>(pointer) - ALIGNED_LIST_ITEM_SIZE);
    if (ptr->magic != MAGIC)
    {
        {
            fast_mutex_autolock lock(new_output_lock);
            fprintf(new_output_fp, "delete%s: invalid pointer %p (",
                    is_array ? "[]" : "", pointer);
            print_position(addr, 0);
            fprintf(new_output_fp, ")\n");
        }
        check_mem_corruption();
        fflush(new_output_fp);
        M_DEBUG_NEW_ERROR_ACTION;
    }
    if (is_array != ptr->is_array)
    {
        const char* msg;
        if (is_array)
            msg = "delete [] after new";
        else
            msg = "delete after new []";
        fast_mutex_autolock lock(new_output_lock);
        fprintf(new_output_fp,
                "%s: pointer %p (size %u)\n\tat ",
                msg,
                reinterpret_cast<char*>(ptr) + ALIGNED_LIST_ITEM_SIZE,
                static_cast<unsigned>(ptr->size));
        print_position(addr, 0);
        fprintf(new_output_fp, "\n\toriginally allocated at ");
        if (ptr->line != 0)
            print_position(ptr->file, ptr->line);
        else
            print_position(ptr->addr, ptr->line);
        fprintf(new_output_fp, "\n");
        fflush(new_output_fp);
        M_DEBUG_NEW_ERROR_ACTION;
    }
#if M_DEBUG_NEW_TAILCHECK
    if (!check_tail(ptr))
    {
        check_mem_corruption();
        fflush(new_output_fp);
        M_DEBUG_NEW_ERROR_ACTION;
    }
#endif
    {
        fast_mutex_autolock lock(new_ptr_lock);
        total_mem_alloc -= ptr->size;
        ptr->magic = 0;
        ptr->prev->next = ptr->next;
        ptr->next->prev = ptr->prev;
    }
    if (new_verbose_flag)
    {
        fast_mutex_autolock lock(new_output_lock);
        fprintf(new_output_fp,
            "delete%s: freed %p (size %u, %u bytes still allocated)\n",
            is_array ? "[]" : "",
            reinterpret_cast<char*>(ptr) + ALIGNED_LIST_ITEM_SIZE,
            static_cast<unsigned>(ptr->size),
            static_cast<unsigned>(total_mem_alloc));
    }
    free(ptr);
    return;
}

/**
 * Checks for memory leaks.
 *
 * @return  zero if no leakage is found; the number of leaks otherwise
 */
int check_leaks()
{
    int leak_cnt = 0;
    int dumped_cnt = 0;
    int new_cnt = 0;
    unsigned long new_size = 0;
    fast_mutex_autolock lock_ptr(new_ptr_lock);
    fast_mutex_autolock lock_output(new_output_lock);
    new_ptr_list_t* ptr = new_ptr_list.next;
    fprintf(new_output_fp, "---LEAKS LIST---\n");

    while (ptr != &new_ptr_list)
    {
        const char* const pointer = reinterpret_cast<const char *const>(ptr)
            + ALIGNED_LIST_ITEM_SIZE;
        if (ptr->magic != MAGIC)
        {
            fprintf(new_output_fp,
                    "warning: heap data corrupt near %p\n",
                    pointer);
        }
#if M_DEBUG_NEW_TAILCHECK
        if (!check_tail(ptr))
        {
            fprintf(new_output_fp,
                    "warning: overwritten past end of object at %p\n",
                    pointer);
        }
#endif
#ifndef DUMP_MEM_ADDRESSES
        if (ptr->line != 0)
#endif
        {
            fprintf(new_output_fp,
                    "Leaked object at %p (size %u, dump %u, ",
                    pointer, static_cast<unsigned>(ptr->size), ptr->dumped);
            if (ptr->line != 0)
                print_position(ptr->file, ptr->line);
            else
                print_position(ptr->addr, ptr->line);
            fprintf(new_output_fp, ")\n");
            ++ new_cnt;
            new_size += static_cast<unsigned long>(ptr->size);
        }
        if (ptr->dumped)
            ++ dumped_cnt;

        ++ ptr->dumped;
        ptr = ptr->next;
        ++ leak_cnt;
    }
    if (new_verbose_flag || leak_cnt)
    {
        fprintf(new_output_fp, "*** %d leaks found, new %d "
            "(size %lu), dumped count %d\n", leak_cnt, new_cnt,
            new_size, dumped_cnt);
    }
    return leak_cnt;
}

/**
 * Checks for heap corruption.
 *
 * @return  zero if no problem is found; the number of found memory
 *          corruptions otherwise
 */
int check_mem_corruption()
{
    int corrupt_cnt = 0;
    fast_mutex_autolock lock_ptr(new_ptr_lock);
    fast_mutex_autolock lock_output(new_output_lock);
    fprintf(new_output_fp, "*** Checking for memory corruption: START\n");
    for (new_ptr_list_t* ptr = new_ptr_list.next;
         ptr != &new_ptr_list;
         ptr = ptr->next)
    {
        const char* const pointer = reinterpret_cast<char*>(ptr)
            + ALIGNED_LIST_ITEM_SIZE;
        if (ptr->magic == MAGIC
#if M_DEBUG_NEW_TAILCHECK
            && check_tail(ptr)
#endif
        )
        {
            continue;
        }
#if M_DEBUG_NEW_TAILCHECK
        if (ptr->magic != MAGIC)
        {
#endif
            fprintf(new_output_fp,
                "Heap data corrupt near %p (size %u, ",
                pointer,
                static_cast<unsigned>(ptr->size));
#if M_DEBUG_NEW_TAILCHECK
        }
        else
        {
            fprintf(new_output_fp,
                    "Overwritten past end of object at %p (size %u, ",
                    pointer,
                    ptr->size);
        }
#endif
        if (ptr->line != 0)
            print_position(ptr->file, ptr->line);
        else
            print_position(ptr->addr, ptr->line);
        fprintf(new_output_fp, ")\n");
        ++ corrupt_cnt;
    }
    fprintf(new_output_fp, "*** Checking for memory corruption: %d FOUND\n",
            corrupt_cnt);
    return corrupt_cnt;
}

void __debug_new_recorder::_M_process(void* pointer)
{
    if (pointer == nullptr)
        return;
    new_ptr_list_t* ptr = reinterpret_cast<new_ptr_list_t*>(
        static_cast<char*>(pointer) - ALIGNED_LIST_ITEM_SIZE);
    if (ptr->magic != MAGIC || ptr->line != 0)
    {
        fast_mutex_autolock lock(new_output_lock);
        fprintf(new_output_fp,
                "warning: debug_new used with placement new (%s:%d)\n",
                _M_file, _M_line);
        return;
    }
#if M_DEBUG_NEW_FILENAME_LEN == 0
    ptr->file = _M_file;
#else
    strncpy(ptr->file, _M_file, M_DEBUG_NEW_FILENAME_LEN - 1)
            [M_DEBUG_NEW_FILENAME_LEN - 1] = '\0';
#endif
    ptr->line = _M_line;
}

void* operator new (size_t size, const char* file, int line)
{
    void* ptr = alloc_mem(size, file, line, false);
#if M_DEBUG_NEW_STD_OPER_NEW
    if (ptr)
        return ptr;
    else
        throw std::bad_alloc();
#else
    return ptr;
#endif
}

void* operator new [](size_t size, const char* file, int line)
{
    void* ptr = alloc_mem(size, file, line, true);
#if M_DEBUG_NEW_STD_OPER_NEW
    if (ptr)
        return ptr;
    else
        throw std::bad_alloc();
#else
    return ptr;
#endif
}

void* operator new (size_t size)  // throw(std::bad_alloc)
{
    return operator new (size, static_cast<char*>(
        M_DEBUG_NEW_CALLER_ADDRESS), 0);
}

void* operator new [](size_t size)  // throw(std::bad_alloc)
{
    return operator new [](size, static_cast<char*>(
        M_DEBUG_NEW_CALLER_ADDRESS), 0);
}

#if !defined(__BORLANDC__) || __BORLANDC__ > 0x551
void* operator new (size_t size, const std::nothrow_t&) throw()
{
    return alloc_mem(size, static_cast<char*>(
        M_DEBUG_NEW_CALLER_ADDRESS), 0, false);
}

void* operator new [](size_t size, const std::nothrow_t&) throw()
{
    return alloc_mem(size, static_cast<char*>(
        M_DEBUG_NEW_CALLER_ADDRESS), 0, true);
}
#endif

void operator delete (void* pointer) throw()
{
    free_pointer(pointer, M_DEBUG_NEW_CALLER_ADDRESS, false);
}

void operator delete [](void* pointer) throw()
{
    free_pointer(pointer, M_DEBUG_NEW_CALLER_ADDRESS, true);
}

#if HAVE_PLACEMENT_DELETE
void operator delete (void* pointer, const char* file, int line) throw()
{
    if (new_verbose_flag)
    {
        fast_mutex_autolock lock(new_output_lock);
        fprintf(new_output_fp,
                "info: exception thrown on initializing object at %p (",
                pointer);
        print_position(file, line);
        fprintf(new_output_fp, ")\n");
    }
    operator delete (pointer);
}

void operator delete [](void* pointer, const char* file, int line) throw()
{
    if (new_verbose_flag)
    {
        fast_mutex_autolock lock(new_output_lock);
        fprintf(new_output_fp,
                "info: exception thrown on initializing objects at %p (",
                pointer);
        print_position(file, line);
        fprintf(new_output_fp, ")\n");
    }
    operator delete [](pointer);
}

void operator delete (void* pointer, const std::nothrow_t&) throw()
{
    operator delete (pointer, static_cast<char*>(
        M_DEBUG_NEW_CALLER_ADDRESS), 0);
}

void operator delete [](void* pointer, const std::nothrow_t&) throw()
{
    operator delete [](pointer, static_cast<char*>(
        M_DEBUG_NEW_CALLER_ADDRESS), 0);
}
#endif  // HAVE_PLACEMENT_DELETE

int __debug_new_counter::_S_count = 0;

/**
 * Constructor to increment the count.
 */
__debug_new_counter::__debug_new_counter()
{
    ++_S_count;
}

/**
 * Destructor to decrement the count.  When the count is zero,
 * #check_leaks will be called.
 */
__debug_new_counter::~__debug_new_counter()
{
    if (--_S_count == 0 && new_autocheck_flag)
        if (check_leaks())
        {
            new_verbose_flag = true;
#if defined(__GNUC__) && __GNUC__ >= 3
            if (!getenv("GLIBCPP_FORCE_NEW") && !getenv("GLIBCXX_FORCE_NEW"))
                fprintf(new_output_fp,
"*** WARNING:  GCC 3 or later is detected, please make sure the\n"
"    environment variable GLIBCPP_FORCE_NEW (GCC 3.2 and 3.3) or\n"
"    GLIBCXX_FORCE_NEW (GCC 3.4 and later) is defined.  Check the\n"
"    README file for details.\n");
#endif
        }
}

#endif