說明
使用 VLD 記憶體泄漏檢測工具輔助開發時整理的學習筆記,本篇介紹 VLD 組態檔中配置項 SkipHeapFreeLeaks 的使用方法,同系列文章目錄可見 《記憶體泄漏檢測工具》目錄
目錄- 說明
- 1. 組態檔使用說明
- 2. 設定是否跳過堆記憶體泄漏檢測
- 2.1 測驗代碼
- 2.2 SkipHeapFreeLeaks = no 時的輸出
- 2.3 SkipHeapFreeLeaks = yes 時的輸出
- 2.4 輸出結果對比
1. 組態檔使用說明
在程式中通過 #include "vld.h" 的方式檢測記憶體泄漏時,VLD 首先會嘗試在程式的生成目錄下讀取 vld.ini 檔案,若未讀取成功,則會嘗試在 VLD 的安裝目錄下讀取 vld.ini 檔案,若仍未讀取成功,則會使用內置的默認配置,內置的默認配置如果不動原始碼是無法更改的,因此通過修改相應目錄下的 vld.ini 檔案來定制 VLD 功能是最好的選擇,當配置引數等號右邊為空,或者給配置了不合法值時,在使用程序中會被程式重置到默認值,
2. 設定是否跳過堆記憶體泄漏檢測
引數名:SkipHeapFreeLeaks,
有效賦值:yes,no,
默認值:no,
功能說明:檔案原話 是 Determines whether or not report memory leaks when missing HeapFree calls. 但是當我把這個變數設定為 yes 時仍可以檢測到堆上的記憶體泄漏,這個配置項的實際作用有待進一步研究,
2.1 測驗代碼
#include <QCoreApplication>
#include "Windows.h"
#include "vld.h"
void testFun(int i)
{
int *ptr = new int(i);
printf("ptr = %08x, *ptr = %08x.\n", ptr, *ptr);
int *pData= https://www.cnblogs.com/young520/archive/2023/03/30/(int *)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(int));
printf("pData = https://www.cnblogs.com/young520/archive/2023/03/30/%08x, *pData = %08x./n", pData, *pData);
}
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
testFun(1);
return a.exec();
}
測驗環境:QT 5.9.2,MSVC 2015 32bit,Debug 模式,VLD 版本為 2.5.1,VLD 組態檔只對該引數做修改,測驗工程所在路徑為:E:\Cworkspace\Qt 5.9\QtDemo\testVLD,
2.2 SkipHeapFreeLeaks = no 時的輸出
標準輸出窗顯示:
ptr = 00539498, *ptr = 00000001.
pData = https://www.cnblogs.com/young520/archive/2023/03/30/00535720, *pData = 00000000.
VLD 輸出報告:
Visual Leak Detector read settings from: D:\Program Files (x86)\Visual Leak Detector\vld.ini
Visual Leak Detector Version 2.5.1 installed.
WARNING: Visual Leak Detector detected memory leaks!
---------- Block 2 at 0x00535720: 4 bytes ----------
Leak Hash: 0x426C3DE0, Count: 1, Total 4 bytes
Call Stack (TID 30052):
ntdll.dll!RtlAllocateHeap()
e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0x11 bytes
e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (18): testVLD.exe!main() + 0x7 bytes
f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl (74): testVLD.exe!invoke_main() + 0x1B bytes
f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl (264): testVLD.exe!__scrt_common_main_seh() + 0x5 bytes
f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl (309): testVLD.exe!__scrt_common_main()
f:\dd\vctools\crt\vcstartup\src\startup\exe_main.cpp (17): testVLD.exe!mainCRTStartup()
KERNEL32.DLL!BaseThreadInitThunk() + 0x19 bytes
ntdll.dll!RtlGetAppContainerNamedObjectPath() + 0x11E bytes
ntdll.dll!RtlGetAppContainerNamedObjectPath() + 0xEE bytes
Data:
00 00 00 00 ........ ........
---------- Block 1 at 0x00539498: 4 bytes ----------
Leak Hash: 0x19BB156F, Count: 1, Total 4 bytes
Call Stack (TID 30052):
ucrtbased.dll!malloc()
f:\dd\vctools\crt\vcstartup\src\heap\new_scalar.cpp (19): testVLD.exe!operator new() + 0x9 bytes
e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (7): testVLD.exe!testFun() + 0x7 bytes
e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (18): testVLD.exe!main() + 0x7 bytes
f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl (74): testVLD.exe!invoke_main() + 0x1B bytes
f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl (264): testVLD.exe!__scrt_common_main_seh() + 0x5 bytes
f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl (309): testVLD.exe!__scrt_common_main()
f:\dd\vctools\crt\vcstartup\src\startup\exe_main.cpp (17): testVLD.exe!mainCRTStartup()
KERNEL32.DLL!BaseThreadInitThunk() + 0x19 bytes
ntdll.dll!RtlGetAppContainerNamedObjectPath() + 0x11E bytes
ntdll.dll!RtlGetAppContainerNamedObjectPath() + 0xEE bytes
Data:
01 00 00 00 ........ ........
Visual Leak Detector detected 2 memory leaks (44 bytes).
Largest number used: 44 bytes.
Total allocations: 44 bytes.
Visual Leak Detector is now exiting.
2.3 SkipHeapFreeLeaks = yes 時的輸出
標準輸出窗顯示:
ptr = 014e9450, *ptr = 00000001.
pData = https://www.cnblogs.com/young520/archive/2023/03/30/014e84b0, *pData = 00000000.
VLD 輸出報告:
Visual Leak Detector read settings from: D:\Program Files (x86)\Visual Leak Detector\vld.ini
Visual Leak Detector Version 2.5.1 installed.
WARNING: Visual Leak Detector detected memory leaks!
---------- Block 2 at 0x014E84B0: 4 bytes ----------
Leak Hash: 0x7C37FF93, Count: 1, Total 4 bytes
Call Stack (TID 7564):
ntdll.dll!RtlAllocateHeap()
e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0x11 bytes
e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (18): testVLD.exe!main() + 0x7 bytes
f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl (74): testVLD.exe!invoke_main() + 0x1B bytes
f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl (264): testVLD.exe!__scrt_common_main_seh() + 0x5 bytes
f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl (309): testVLD.exe!__scrt_common_main()
f:\dd\vctools\crt\vcstartup\src\startup\exe_main.cpp (17): testVLD.exe!mainCRTStartup()
KERNEL32.DLL!BaseThreadInitThunk() + 0x19 bytes
ntdll.dll!RtlGetAppContainerNamedObjectPath() + 0x11E bytes
ntdll.dll!RtlGetAppContainerNamedObjectPath() + 0xEE bytes
Data:
00 00 00 00 ........ ........
---------- Block 1 at 0x014E9450: 4 bytes ----------
Leak Hash: 0x8876C556, Count: 1, Total 4 bytes
Call Stack (TID 7564):
ucrtbased.dll!malloc()
f:\dd\vctools\crt\vcstartup\src\heap\new_scalar.cpp (19): testVLD.exe!operator new() + 0x9 bytes
e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (7): testVLD.exe!testFun() + 0x7 bytes
e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (18): testVLD.exe!main() + 0x7 bytes
f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl (74): testVLD.exe!invoke_main() + 0x1B bytes
f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl (264): testVLD.exe!__scrt_common_main_seh() + 0x5 bytes
f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl (309): testVLD.exe!__scrt_common_main()
f:\dd\vctools\crt\vcstartup\src\startup\exe_main.cpp (17): testVLD.exe!mainCRTStartup()
KERNEL32.DLL!BaseThreadInitThunk() + 0x19 bytes
ntdll.dll!RtlGetAppContainerNamedObjectPath() + 0x11E bytes
ntdll.dll!RtlGetAppContainerNamedObjectPath() + 0xEE bytes
Data:
01 00 00 00 ........ ........
Visual Leak Detector detected 2 memory leaks (44 bytes).
Largest number used: 44 bytes.
Total allocations: 44 bytes.
Visual Leak Detector is now exiting.
2.4 輸出結果對比
SkipHeapFreeLeaks = no 與 SkipHeapFreeLeaks = yes 的輸出結果似乎沒有什么實質性的差異,不過有一點需注意,使用 new 分配堆記憶體時,會額外添加 36 bytes 大小的記憶體用于追蹤管理,但使用 HeapAlloc() 函式分配堆記憶體時,則沒有額外的記憶體使用,因此上述測驗例的 Total allocations 為 44 bytes,而不是 80 bytes,
本文作者:木三百川
本文鏈接:https://www.cnblogs.com/young520/p/17263228.html
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