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【Visual Leak Detector】配置项 AggregateDuplicates

来源:博客园

说明

使用 VLD 内存泄漏检测工具辅助开发时整理的学习笔记。本篇介绍 VLD 配置文件中配置项 AggregateDuplicates 的使用方法。

目录
  • 说明
  • 1. 配置文件使用说明
  • 2. 设置是否显示重复的泄漏块
    • 2.1 测试代码
    • 2.2 AggregateDuplicates = no 时的输出
    • 2.3 AggregateDuplicates = yes 时的输出
    • 2.4 输出结果对比

1. 配置文件使用说明

在程序中通过 #include "vld.h"的方式检测内存泄漏时,VLD 首先会尝试在程序的生成目录下读取 vld.ini文件,若未读取成功,则会尝试在 VLD 的安装目录下读取 vld.ini文件,若仍未读取成功,则会使用内置的默认配置,内置的默认配置如果不动源码是无法更改的,因此通过修改相应目录下的 vld.ini文件来定制 VLD 功能是最好的选择。当配置参数等号右边为空,或者给配置了不合法值时,在使用过程中会被程序重置到默认值。

2. 设置是否显示重复的泄漏块

参数名AggregateDuplicates


【资料图】

有效赋值yesno

默认值no

功能说明:为 yes时将合并显示具有相同大小和相同调用堆栈的泄漏内存块,只显示首个泄漏内存块的详细信息,并显示其重复的次数;为 no时则每次泄漏都会单独显示。

2.1 测试代码

#include #include "vld.h"void testFun(int i){    int *ptr = new int(i);    printf("ptr = %08x, *ptr = %08x.\n", ptr, *ptr);}int main(int argc, char *argv[]){    QCoreApplication a(argc, argv);    for (int i = 1; i < 3; i++)    {        testFun(i);    }    return a.exec();}

测试环境:QT 5.9.2MSVC 2015 32bitDebug模式,VLD 版本为 2.5.1,VLD 配置文件只对该参数做修改,测试工程所在路径为:E:\Cworkspace\Qt 5.9\QtDemo\testVLD

2.2 AggregateDuplicates = no 时的输出

标准输出窗显示:

ptr = 007f7c98, *ptr = 00000001.ptr = 007f8058, *ptr = 00000002.

VLD 输出报告:

Visual Leak Detector read settings from: D:\Program Files (x86)\Visual Leak Detector\vld.iniVisual Leak Detector Version 2.5.1 installed.WARNING: Visual Leak Detector detected memory leaks!---------- Block 1 at 0x007F7C98: 4 bytes ----------  Leak Hash: 0xF253A4C4, Count: 1, Total 4 bytes  Call Stack (TID 30620):    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 (6): testVLD.exe!testFun() + 0x7 bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (16): testVLD.exe!main() + 0x9 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                                                  ........ ........---------- Block 2 at 0x007F8058: 4 bytes ----------  Leak Hash: 0xF253A4C4, Count: 1, Total 4 bytes  Call Stack (TID 30620):    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 (6): testVLD.exe!testFun() + 0x7 bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (16): testVLD.exe!main() + 0x9 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:    02 00 00 00                                                  ........ ........Visual Leak Detector detected 2 memory leaks (80 bytes).Largest number used: 80 bytes.Total allocations: 80 bytes.Visual Leak Detector is now exiting.

2.3 AggregateDuplicates = yes 时的输出

标准输出窗显示:

ptr = 00a673d0, *ptr = 00000001.ptr = 00a67400, *ptr = 00000002.

VLD 输出报告:

Visual Leak Detector read settings from: D:\Program Files (x86)\Visual Leak Detector\vld.iniVisual Leak Detector Version 2.5.1 installed.    Aggregating duplicate leaks.WARNING: Visual Leak Detector detected memory leaks!---------- Block 1 at 0x00A673D0: 4 bytes ----------  Leak Hash: 0xF253A4C4, Count: 2, Total 8 bytes  Call Stack:    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 (6): testVLD.exe!testFun() + 0x7 bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (16): testVLD.exe!main() + 0x9 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 (80 bytes).Largest number used: 80 bytes.Total allocations: 80 bytes.Visual Leak Detector is now exiting.

2.4 输出结果对比

  • AggregateDuplicates = yes时合并显示了具有相同大小和相同调用堆栈的泄漏内存块,且只显示首个泄漏内存块 0x00A673D0的详细信息,并显示其重复的次数及泄漏总大小 Count: 2, Total 8 bytes
  • AggregateDuplicates = no时每次泄漏都会单独显示,因此 Count恒为 1,仔细观察可以发现,对于具有相同大小和相同调用堆栈的泄漏内存块,它们的 Leak Hash值也相同,在测试例中都为 0xF253A4C4,所以不妨推断 Leak Hash的计算由泄漏块大小及其调用堆栈决定

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