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Diffstat (limited to 'src/debug/nvwa/debug_new.cpp')
| -rw-r--r-- | src/debug/nvwa/debug_new.cpp | 1197 |
1 files changed, 1197 insertions, 0 deletions
diff --git a/src/debug/nvwa/debug_new.cpp b/src/debug/nvwa/debug_new.cpp new file mode 100644 index 000000000..1a59353a3 --- /dev/null +++ b/src/debug/nvwa/debug_new.cpp @@ -0,0 +1,1197 @@ +// -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- +// vim:tabstop=4:shiftwidth=4:expandtab: + +/* + * Copyright (C) 2004-2016 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 + * + */ + +/** + * @file debug_new.cpp + * + * Implementation of debug versions of new and delete to check leakage. + * + * @date 2016-10-14 + */ + +#include "localconsts.h" + +PRAGMACLANG6GCC(GCC diagnostic push) +PRAGMACLANG6GCC(GCC diagnostic ignored "-Wold-style-cast") + +PRAGMA45(GCC diagnostic push) +PRAGMA45(GCC diagnostic ignored "-Wcast-qual") + +#include <new> // std::bad_alloc/nothrow_t +#include <assert.h> // assert +#include <stdio.h> // fprintf/stderr +#include <stdlib.h> // abort +#include <string.h> // strcpy/strncpy/sprintf +#include "debug/_nvwa.h" // NVWA macros + +#if NVWA_UNIX +#include <alloca.h> // alloca +#endif +#if NVWA_WIN32 +#include <malloc.h> // alloca +#endif + +#if NVWA_LINUX || NVWA_APPLE +#include <execinfo.h> // backtrace +#endif + +#if NVWA_WINDOWS +#ifndef WIN32_LEAN_AND_MEAN +#define WIN32_LEAN_AND_MEAN +#endif +#include <windows.h> // CaptureStackBackTrace +#endif + +#include "debug/c++11.h" // _NOEXCEPT/_NULLPTR +#include "debug/fast_mutex.h" // nvwa::fast_mutex +#include "debug/static_assert.h" // STATIC_ASSERT + +#undef _DEBUG_NEW_EMULATE_MALLOC +#undef _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 _DEBUG_NEW_REDEFINE_NEW 0 +#include "debug/nvwa/debug_new.h" + +#if !_FAST_MUTEX_CHECK_INITIALIZATION && !defined(_NOTHREADS) +#error "_FAST_MUTEX_CHECK_INITIALIZATION not set: check_leaks may not work" +#endif + +/** + * @def _DEBUG_NEW_ALIGNMENT + * + * The alignment requirement of allocated memory blocks. It must be a + * power of two. + */ +#ifndef _DEBUG_NEW_ALIGNMENT +#define _DEBUG_NEW_ALIGNMENT 16 +#endif + +/** + * @def _DEBUG_NEW_CALLER_ADDRESS + * + * The expression to return the caller address. nvwa#print_position will + * later on use this address to print the position information of memory + * operation points. + */ +#ifndef _DEBUG_NEW_CALLER_ADDRESS +#ifdef __GNUC__ +#define _DEBUG_NEW_CALLER_ADDRESS __builtin_return_address(0) +#else +#define _DEBUG_NEW_CALLER_ADDRESS _NULLPTR +#endif +#endif + +/** + * @def _DEBUG_NEW_ERROR_ACTION + * + * The action to take when an error occurs. The default behaviour is to + * call \e abort, unless \c _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 _DEBUG_NEW_ERROR_ACTION +#ifndef _DEBUG_NEW_ERROR_CRASH +#define _DEBUG_NEW_ERROR_ACTION abort() +#else +#define _DEBUG_NEW_ERROR_ACTION do { *((char*)0) = 0; abort(); } while (0) +#endif +#endif + +/** + * @def _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 + * value is non-zero (thus to copy the file name) on non-Windows + * platforms, because I once found that the exit leakage check could not + * access the address of the file name on Linux (in my case, a core dump + * occurred when check_leaks tried to access the file name in a shared + * library after a \c SIGINT). This value makes the size of + * new_ptr_list_t \c 64 on non-Windows 32-bit platforms (w/o stack + * backtrace). + */ +#ifndef _DEBUG_NEW_FILENAME_LEN +#if NVWA_WINDOWS +#define _DEBUG_NEW_FILENAME_LEN 0 +#else +#define _DEBUG_NEW_FILENAME_LEN 44 +#endif +#endif + +/** + * @def _DEBUG_NEW_PROGNAME + * + * The program (executable) name to be set at compile time. It is + * better to assign the full program path to nvwa#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>-D_DEBUG_NEW_PROGNAME=\\"a.out\"</code> + * in \e bash, or <code>-D_DEBUG_NEW_PROGNAME=\\"a.exe\"</code> in the + * Windows command prompt. + */ +#ifndef _DEBUG_NEW_PROGNAME +#define _DEBUG_NEW_PROGNAME _NULLPTR +#endif + +/** + * @def _DEBUG_NEW_REMEMBER_STACK_TRACE + * + * Macro to indicate whether stack traces of allocations should be + * included in NVWA allocation information and be printed while leaks + * are reported. Useful to pinpoint leaks caused by strdup and other + * custom allocation functions. It is also very helpful in filtering + * out false positives caused by internal STL/C runtime operations. It + * is off by default because it is quite memory heavy. Set it to \c 1 + * to make all allocations have stack trace attached, or set to \c 2 to + * make only allocations that lack calling source code information (file + * and line) have the stack trace attached. + */ +#ifndef _DEBUG_NEW_REMEMBER_STACK_TRACE +#define _DEBUG_NEW_REMEMBER_STACK_TRACE 0 +#endif + +/** + * @def _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 _DEBUG_NEW_STD_OPER_NEW +#define _DEBUG_NEW_STD_OPER_NEW 1 +#endif + +/** + * @def _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 _DEBUG_NEW_TAILCHECK +#define _DEBUG_NEW_TAILCHECK 0 +#endif + +/** + * @def _DEBUG_NEW_TAILCHECK_CHAR + * + * Value of the padding bytes at the end of a memory block. + */ +//#ifndef _DEBUG_NEW_TAILCHECK_CHAR +//#define _DEBUG_NEW_TAILCHECK_CHAR 0xCC +//#endif + +/** + * @def _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 _DEBUG_NEW_USE_ADDR2LINE +#ifdef __GNUC__ +#define _DEBUG_NEW_USE_ADDR2LINE 1 +#else +#define _DEBUG_NEW_USE_ADDR2LINE 0 +#endif +#endif + +#ifdef _MSC_VER +#pragma warning(disable: 4074) // #pragma init_seg(compiler) used +#pragma warning(disable: 4290) // C++ exception specification ignored +#if _MSC_VER >= 1400 // Visual Studio 2005 or later +#pragma warning(disable: 4996) // Use the `unsafe' strncpy +#endif +#pragma init_seg(compiler) +#endif + +/** + * Gets the aligned value of memory block size. + */ +#define ALIGN(s) \ + (((s) + _DEBUG_NEW_ALIGNMENT - 1) & ~(_DEBUG_NEW_ALIGNMENT - 1)) + +NVWA_NAMESPACE_BEGIN + +/** + * The platform memory alignment. The current value works well in + * platforms I have tested: Windows XP, Windows 7 x64, and Mac OS X + * Leopard. It may be smaller than the real alignment, but must be + * bigger than \c sizeof(size_t) for it work. nvwa#debug_new_recorder + * uses it to detect misaligned pointer returned by `<code>new + * NonPODType[size]</code>'. + */ +const size_t PLATFORM_MEM_ALIGNMENT = sizeof(size_t) * 2; + +/** + * Structure to store the position information where \c new occurs. + */ +struct new_ptr_list_t +{ + new_ptr_list_t* next; ///< Pointer to the next memory block + new_ptr_list_t* prev; ///< Pointer to the previous memory block + size_t size; ///< Size of the memory block + union + { +#if _DEBUG_NEW_FILENAME_LEN == 0 + const char* file; ///< Pointer to the file name of the caller +#else + char file[_DEBUG_NEW_FILENAME_LEN]; ///< File name of the caller +#endif + void* addr; ///< Address of the caller to \e new + }; + unsigned line :31; ///< Line number of the caller; or \c 0 + unsigned is_array:1; ///< Non-zero iff <em>new[]</em> is used +#if _DEBUG_NEW_REMEMBER_STACK_TRACE + void** stacktrace; ///< Pointer to stack trace information +#endif + unsigned magic; ///< Magic number for error detection +}; + +/** + * Definition of the constant magic number used for error detection. + */ +static const unsigned DEBUG_NEW_MAGIC = 0x4442474E; + +/** + * The extra memory allocated by <code>operator new</code>. + */ +static 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 _DEBUG_NEW_FILENAME_LEN == 0 + _NULLPTR +#else + "" +#endif + }, + 0, + 0, +#if _DEBUG_NEW_REMEMBER_STACK_TRACE + _NULLPTR, +#endif + DEBUG_NEW_MAGIC +}; + +/** + * 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 nvwa#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 + * #_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 = _DEBUG_NEW_PROGNAME; + +/** + * Pointer to the callback used to print the stack backtrace in case of + * a memory problem. A null value causes the default stack trace + * printing routine to be used. + */ +stacktrace_print_callback_t stacktrace_print_callback = _NULLPTR; + +/** + * Pointer to the callback used to filter out false positives from leak + * reports. A null value means the lack of filtering. + */ +leak_whitelist_callback_t leak_whitelist_callback = _NULLPTR; + +#if _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) + { +#if NVWA_APPLE + const char addr2line_cmd[] = "atos -o "; +#else + const char addr2line_cmd[] = "addr2line -e "; +#endif + +#if NVWA_WINDOWS + const int exeext_len = 4; +#else + const int exeext_len = 0; +#endif + +#if NVWA_UNIX && !NVWA_CYGWIN + const char ignore_err[] = " 2>/dev/null"; +#elif NVWA_CYGWIN || \ + (NVWA_WIN32 && defined(WINVER) && WINVER >= 0x0500) + const char ignore_err[] = " 2>nul"; +#else + const char ignore_err[] = ""; +#endif + char* cmd = (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 NVWA_WINDOWS + 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 // _DEBUG_NEW_USE_ADDR2LINE + +/** + * Prints the position information of a memory operation point. When \c + * _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", (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 _DEBUG_NEW_REMEMBER_STACK_TRACE +/** + * Prints the stack backtrace. + * + * When nvwa#stacktrace_print_callback is not null, it is used for + * printing the stacktrace items. Default implementation of call stack + * printing is very spartan—only stack frame pointers are + * printed—but even that output is still useful. Just do address + * lookup in LLDB etc. + * + * @param stacktrace pointer to the stack trace array + */ +static void print_stacktrace(void** stacktrace) +{ + if (stacktrace_print_callback == _NULLPTR) + { + fprintf(new_output_fp, "Stack backtrace:\n"); + for (size_t i = 0; stacktrace[i] != _NULLPTR; ++i) + fprintf(new_output_fp, "%p\n", stacktrace[i]); + } + else + { + stacktrace_print_callback(new_output_fp, stacktrace); + } +} +#endif + +/** + * Checks whether a leak should be ignored. Its runtime performance + * depends on the callback nvwa#leak_whitelist_callback. + * + * @param ptr pointer to a new_ptr_list_t struct + * @return \c true if the leak should be whitelisted; \c false + * otherwise + */ +static bool is_leak_whitelisted(new_ptr_list_t* ptr) +{ + if (leak_whitelist_callback == _NULLPTR) + return false; + + char const* file = ptr->line != 0 ? ptr->file : _NULLPTR; + int line = ptr->line; + void* addr = ptr->line == 0 ? ptr->addr : _NULLPTR; +#if _DEBUG_NEW_REMEMBER_STACK_TRACE + void** stacktrace = ptr->stacktrace; +#else + void** stacktrace = _NULLPTR; +#endif + + return leak_whitelist_callback(file, line, addr, stacktrace); +} + +#if _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 tail_ptr = (unsigned char*)ptr + + ALIGNED_LIST_ITEM_SIZE + ptr->size; + for (int i = 0; i < _DEBUG_NEW_TAILCHECK; ++i) + if (tail_ptr[i] != _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; 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); +#if _DEBUG_NEW_TYPE == 1 + STATIC_ASSERT(_DEBUG_NEW_ALIGNMENT >= PLATFORM_MEM_ALIGNMENT, + Alignment_too_small); +#endif + STATIC_ASSERT((_DEBUG_NEW_ALIGNMENT & (_DEBUG_NEW_ALIGNMENT - 1)) == 0, + Alignment_must_be_power_of_two); + STATIC_ASSERT(_DEBUG_NEW_TAILCHECK >= 0, Invalid_tail_check_length); + size_t s = size + ALIGNED_LIST_ITEM_SIZE + _DEBUG_NEW_TAILCHECK; + new_ptr_list_t* ptr = (new_ptr_list_t*)malloc(s); + if (ptr == _NULLPTR) + { +#if _DEBUG_NEW_STD_OPER_NEW + return _NULLPTR; +#else + fast_mutex_autolock lock(new_output_lock); + fprintf(new_output_fp, + "Out of memory when allocating %lu bytes\n", + (unsigned long)size); + fflush(new_output_fp); + _DEBUG_NEW_ERROR_ACTION; +#endif + } + void* usr_ptr = (char*)ptr + ALIGNED_LIST_ITEM_SIZE; +#if _DEBUG_NEW_FILENAME_LEN == 0 + ptr->file = file; +#else + if (line) + strncpy(ptr->file, file, _DEBUG_NEW_FILENAME_LEN - 1) + [_DEBUG_NEW_FILENAME_LEN - 1] = '\0'; + else + ptr->addr = (void*)file; +#endif + ptr->line = line; +#if _DEBUG_NEW_REMEMBER_STACK_TRACE + ptr->stacktrace = _NULLPTR; + +#if _DEBUG_NEW_REMEMBER_STACK_TRACE == 2 + if (line == 0) +#endif + { + void* buffer [255]; + size_t buffer_length = sizeof(buffer) / sizeof(*buffer); + +#if NVWA_UNIX + int stacktrace_length = backtrace(buffer, int(buffer_length)); +#endif + +#if NVWA_WINDOWS + USHORT stacktrace_length = CaptureStackBackTrace( + 0, DWORD(buffer_length), buffer, _NULLPTR); +#endif + + size_t stacktrace_size = stacktrace_length * sizeof(void*); + ptr->stacktrace = (void**)malloc(stacktrace_size + sizeof(void*)); + + if (ptr->stacktrace != _NULLPTR) + { + memcpy(ptr->stacktrace, buffer, stacktrace_size); + ptr->stacktrace[stacktrace_length] = _NULLPTR; + } + } +#endif + ptr->is_array = is_array; + ptr->size = size; + ptr->magic = DEBUG_NEW_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; + } +#if _DEBUG_NEW_TAILCHECK + memset((char*)usr_ptr + size, _DEBUG_NEW_TAILCHECK_CHAR, + _DEBUG_NEW_TAILCHECK); +#endif + if (new_verbose_flag) + { + fast_mutex_autolock lock(new_output_lock); + fprintf(new_output_fp, + "new%s: allocated %p (size %lu, ", + is_array ? "[]" : "", + usr_ptr, (unsigned long)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 usr_ptr; +} + +/** + * Frees memory and adjusts pointers. + * + * @param usr_ptr pointer to the previously allocated memory + * @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* usr_ptr, void* addr, bool is_array) +{ + if (usr_ptr == _NULLPTR) + return; + new_ptr_list_t* ptr = + (new_ptr_list_t*)((char*)usr_ptr - ALIGNED_LIST_ITEM_SIZE); + if (ptr->magic != DEBUG_NEW_MAGIC) + { + { + fast_mutex_autolock lock(new_output_lock); + fprintf(new_output_fp, "delete%s: invalid pointer %p (", + is_array ? "[]" : "", usr_ptr); + print_position(addr, 0); + fprintf(new_output_fp, ")\n"); + } + check_mem_corruption(); + fflush(new_output_fp); + _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 %lu)\n\tat ", + msg, + (char*)ptr + ALIGNED_LIST_ITEM_SIZE, + (unsigned long)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); + _DEBUG_NEW_ERROR_ACTION; + } +#if _DEBUG_NEW_TAILCHECK + if (!check_tail(ptr)) + { + check_mem_corruption(); + fflush(new_output_fp); + _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 %lu, %lu bytes still allocated)\n", + is_array ? "[]" : "", + (char*)ptr + ALIGNED_LIST_ITEM_SIZE, + (unsigned long)ptr->size, (unsigned long)total_mem_alloc); + } +#if _DEBUG_NEW_REMEMBER_STACK_TRACE + free(ptr->stacktrace); +#endif + 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 whitelisted_leak_cnt = 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; + + while (ptr != &new_ptr_list) + { + const char* const usr_ptr = (char*)ptr + ALIGNED_LIST_ITEM_SIZE; + if (ptr->magic != DEBUG_NEW_MAGIC) + { + fprintf(new_output_fp, + "warning: heap data corrupt near %p\n", + usr_ptr); + } +#if _DEBUG_NEW_TAILCHECK + if (!check_tail(ptr)) + { + fprintf(new_output_fp, + "warning: overwritten past end of object at %p\n", + usr_ptr); + } +#endif + + if (is_leak_whitelisted(ptr)) + { + ++whitelisted_leak_cnt; + } + else + { + fprintf(new_output_fp, + "Leaked object at %p (size %lu, ", + usr_ptr, + (unsigned long)ptr->size); + + if (ptr->line != 0) + print_position(ptr->file, ptr->line); + else + print_position(ptr->addr, ptr->line); + + fprintf(new_output_fp, ")\n"); + +#if _DEBUG_NEW_REMEMBER_STACK_TRACE + if (ptr->stacktrace != _NULLPTR) + print_stacktrace(ptr->stacktrace); +#endif + } + + ptr = ptr->next; + ++leak_cnt; + } + if (new_verbose_flag || leak_cnt) + { + if (whitelisted_leak_cnt > 0) + { + fprintf(new_output_fp, "*** %d leaks found (%d whitelisted)\n", + leak_cnt, whitelisted_leak_cnt); + } + else + { + fprintf(new_output_fp, "*** %d leaks found\n", leak_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 usr_ptr = (char*)ptr + ALIGNED_LIST_ITEM_SIZE; + if (ptr->magic == DEBUG_NEW_MAGIC +#if _DEBUG_NEW_TAILCHECK + && check_tail(ptr) +#endif + ) + continue; +#if _DEBUG_NEW_TAILCHECK + if (ptr->magic != DEBUG_NEW_MAGIC) + { +#endif + fprintf(new_output_fp, + "Heap data corrupt near %p (size %lu, ", + usr_ptr, + (unsigned long)ptr->size); +#if _DEBUG_NEW_TAILCHECK + } + else + { + fprintf(new_output_fp, + "Overwritten past end of object at %p (size %lu, ", + usr_ptr, + (unsigned long)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"); + +#if _DEBUG_NEW_REMEMBER_STACK_TRACE + if (ptr->stacktrace != _NULLPTR) + print_stacktrace(ptr->stacktrace); +#endif + + ++corrupt_cnt; + } + fprintf(new_output_fp, "*** Checking for memory corruption: %d FOUND\n", + corrupt_cnt); + return corrupt_cnt; +} + +/** + * Processes the allocated memory and inserts file/line informatin. + * It will only be done when it can ensure the memory is allocated by + * one of our operator new variants. + * + * @param usr_ptr pointer returned by a new-expression + */ +void debug_new_recorder::_M_process(void* usr_ptr) +{ + if (usr_ptr == _NULLPTR) + return; + + // In an expression `new NonPODType[size]', the pointer returned is + // not the pointer returned by operator new[], but offset by size_t + // to leave room for the size. It needs to be compensated here. + size_t offset = (char*)usr_ptr - (char*)_NULLPTR; + if (offset % PLATFORM_MEM_ALIGNMENT != 0) { + offset -= sizeof(size_t); + if (offset % PLATFORM_MEM_ALIGNMENT != 0) { + fast_mutex_autolock lock(new_output_lock); + fprintf(new_output_fp, + "warning: memory unaligned; skipping processing (%s:%d)\n", + _M_file, _M_line); + return; + } + usr_ptr = (char*)usr_ptr - sizeof(size_t); + } + + new_ptr_list_t* ptr = + (new_ptr_list_t*)((char*)usr_ptr - ALIGNED_LIST_ITEM_SIZE); + if (ptr->magic != DEBUG_NEW_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 (new_verbose_flag) { + fast_mutex_autolock lock(new_output_lock); + fprintf(new_output_fp, + "info: pointer %p allocated from %s:%d\n", + usr_ptr, _M_file, _M_line); + } +#if _DEBUG_NEW_FILENAME_LEN == 0 + ptr->file = _M_file; +#else + strncpy(ptr->file, _M_file, _DEBUG_NEW_FILENAME_LEN - 1) + [_DEBUG_NEW_FILENAME_LEN - 1] = '\0'; +#endif + ptr->line = _M_line; +#if _DEBUG_NEW_REMEMBER_STACK_TRACE == 2 + free(ptr->stacktrace); + ptr->stacktrace = _NULLPTR; +#endif +} + +/** + * Count of source files that use debug_new. + */ +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, + * nvwa#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 is detected, please make sure the environment\n" +" variable GLIBCPP_FORCE_NEW (GCC 3.2 and 3.3) or GLIBCXX_FORCE_NEW\n" +" (GCC 3.4) is defined. Check the README file for details.\n"); +#endif + } +} + +NVWA_NAMESPACE_END + +#if NVWA_USE_NAMESPACE +using namespace nvwa; +#endif // NVWA_USE_NAMESPACE + +/** + * Allocates memory with file/line information. + * + * @param size size of the required memory block + * @param file null-terminated string of the file name + * @param line line number + * @return pointer to the memory allocated; or null if memory is + * insufficient (#_DEBUG_NEW_STD_OPER_NEW is 0) + * @throw bad_alloc memory is insufficient (#_DEBUG_NEW_STD_OPER_NEW is 1) + */ +void* operator new(size_t size, const char* file, int line) +{ + void* ptr = alloc_mem(size, file, line, false); +#if _DEBUG_NEW_STD_OPER_NEW + if (ptr) + return ptr; + else + throw std::bad_alloc(); +#else + return ptr; +#endif +} + +/** + * Allocates array memory with file/line information. + * + * @param size size of the required memory block + * @param file null-terminated string of the file name + * @param line line number + * @return pointer to the memory allocated; or null if memory is + * insufficient (#_DEBUG_NEW_STD_OPER_NEW is 0) + * @throw bad_alloc memory is insufficient (#_DEBUG_NEW_STD_OPER_NEW is 1) + */ +void* operator new[](size_t size, const char* file, int line) +{ + void* ptr = alloc_mem(size, file, line, true); +#if _DEBUG_NEW_STD_OPER_NEW + if (ptr) + return ptr; + else + throw std::bad_alloc(); +#else + return ptr; +#endif +} + +/** + * Allocates memory without file/line information. + * + * @param size size of the required memory block + * @return pointer to the memory allocated; or null if memory is + * insufficient (#_DEBUG_NEW_STD_OPER_NEW is 0) + * @throw bad_alloc memory is insufficient (#_DEBUG_NEW_STD_OPER_NEW is 1) + */ +void* operator new(size_t size) +{ + return operator new(size, (char*)_DEBUG_NEW_CALLER_ADDRESS, 0); +} + +/** + * Allocates array memory without file/line information. + * + * @param size size of the required memory block + * @return pointer to the memory allocated; or null if memory is + * insufficient (#_DEBUG_NEW_STD_OPER_NEW is 0) + * @throw bad_alloc memory is insufficient (#_DEBUG_NEW_STD_OPER_NEW is 1) + */ +void* operator new[](size_t size) +{ + return operator new[](size, (char*)_DEBUG_NEW_CALLER_ADDRESS, 0); +} + +/** + * Allocates memory with no-throw guarantee. + * + * @param size size of the required memory block + * @return pointer to the memory allocated; or null if memory is + * insufficient + */ +void* operator new(size_t size, const std::nothrow_t&) _NOEXCEPT +{ + return alloc_mem(size, (char*)_DEBUG_NEW_CALLER_ADDRESS, 0, false); +} + +/** + * Allocates array memory with no-throw guarantee. + * + * @param size size of the required memory block + * @return pointer to the memory allocated; or null if memory is + * insufficient + */ +void* operator new[](size_t size, const std::nothrow_t&) _NOEXCEPT +{ + return alloc_mem(size, (char*)_DEBUG_NEW_CALLER_ADDRESS, 0, true); +} + +/** + * Deallocates memory. + * + * @param ptr pointer to the previously allocated memory + */ +void operator delete(void* ptr) _NOEXCEPT +{ + free_pointer(ptr, _DEBUG_NEW_CALLER_ADDRESS, false); +} + +/** + * Deallocates array memory. + * + * @param ptr pointer to the previously allocated memory + */ +void operator delete[](void* ptr) _NOEXCEPT +{ + free_pointer(ptr, _DEBUG_NEW_CALLER_ADDRESS, true); +} + +#if __cplusplus >= 201402L +// GCC under C++14 wants these definitions + +void operator delete(void* ptr, size_t) _NOEXCEPT +{ + free_pointer(ptr, _DEBUG_NEW_CALLER_ADDRESS, false); +} + +void operator delete[](void* ptr, size_t) _NOEXCEPT +{ + free_pointer(ptr, _DEBUG_NEW_CALLER_ADDRESS, true); +} +#endif + +/** + * Placement deallocation function. For details, please check Section + * 5.3.4 of the C++ 1998 or 2011 Standard. + * + * @param ptr pointer to the previously allocated memory + * @param file null-terminated string of the file name + * @param line line number + * + * @see http://www.csci.csusb.edu/dick/c++std/cd2/expr.html#expr.new + * @see http://wyw.dcweb.cn/leakage.htm + */ +void operator delete(void* ptr, const char* file, int line) _NOEXCEPT +{ + if (new_verbose_flag) + { + fast_mutex_autolock lock(new_output_lock); + fprintf(new_output_fp, + "info: exception thrown on initializing object at %p (", + ptr); + print_position(file, line); + fprintf(new_output_fp, ")\n"); + } + operator delete(ptr); +} + +/** + * Placement deallocation function. For details, please check Section + * 5.3.4 of the C++ 1998 or 2011 Standard. + * + * @param ptr pointer to the previously allocated memory + * @param file null-terminated string of the file name + * @param line line number + */ +void operator delete[](void* ptr, const char* file, int line) _NOEXCEPT +{ + if (new_verbose_flag) + { + fast_mutex_autolock lock(new_output_lock); + fprintf(new_output_fp, + "info: exception thrown on initializing objects at %p (", + ptr); + print_position(file, line); + fprintf(new_output_fp, ")\n"); + } + operator delete[](ptr); +} + +/** + * Placement deallocation function. For details, please check Section + * 5.3.4 of the C++ 1998 or 2011 Standard. + * + * @param ptr pointer to the previously allocated memory + */ +void operator delete(void* ptr, const std::nothrow_t&) _NOEXCEPT +{ + operator delete(ptr, (char*)_DEBUG_NEW_CALLER_ADDRESS, 0); +} + +/** + * Placement deallocation function. For details, please check Section + * 5.3.4 of the C++ 1998 or 2011 Standard. + * + * @param ptr pointer to the previously allocated memory + */ +void operator delete[](void* ptr, const std::nothrow_t&) _NOEXCEPT +{ + operator delete[](ptr, (char*)_DEBUG_NEW_CALLER_ADDRESS, 0); +} + +// This is to make Doxygen happy +#undef _DEBUG_NEW_REMEMBER_STACK_TRACE +//#define _DEBUG_NEW_REMEMBER_STACK_TRACE 0 + +PRAGMA45(GCC diagnostic pop) +PRAGMACLANG6GCC(GCC diagnostic pop) |