最新要闻

广告

手机

iphone11大小尺寸是多少?苹果iPhone11和iPhone13的区别是什么?

iphone11大小尺寸是多少?苹果iPhone11和iPhone13的区别是什么?

警方通报辅警执法直播中被撞飞:犯罪嫌疑人已投案

警方通报辅警执法直播中被撞飞:犯罪嫌疑人已投案

家电

【世界速看料】【Visual Leak Detector】配置项 StackWalkMethod

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 StackWalkMethod 的使用方法。同系列文章目录可见 《内存泄漏检测工具》目录

目录
  • 说明
  • 1. 配置文件使用说明
  • 2. 设置调用堆栈的跟踪方法
    • 2.1 测试代码
    • 2.2 StackWalkMethod = fast 时的输出
    • 2.3 StackWalkMethod = safe 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. 设置调用堆栈的跟踪方法

参数名StackWalkMethod


(资料图)

有效赋值fastsafe

默认值fast

功能说明:设置调用堆栈的跟踪方法。fast方法速度快但跟踪的调用堆栈可能不完整,会漏掉一些;safe方法能更可靠地获得完整的调用堆栈,但速度会慢很多,有可能导致被检测的程序性能出现显著下降,这时为了减少检测时间,可以将配置项 MaxTraceFrames设置得小一些。

2.1 测试代码

#include #include #include #include "vld.h"void testFun(int i){    if (i > 1)    {        testFun(i-1);    }else    {        int *ptr = new int(i);        printf("ptr = %08x, *ptr = %08x.\n", ptr, *ptr);    }}int main(int argc, char *argv[]){    QCoreApplication a(argc, argv);    QTime timedebuge;    timedebuge.start();    testFun(30);    qDebug() << "Elapsed Time: " << timedebuge.elapsed() << "ms";    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 StackWalkMethod = fast 时的输出

标准输出窗显示:

ptr = 006e90c0, *ptr = 00000001.Elapsed Time:  1 ms

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 0x006E90C0: 4 bytes ----------  Leak Hash: 0x03496A17, Count: 1, Total 4 bytes  Call Stack (TID 11760):    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 (13): testVLD.exe!testFun() + 0x7 bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (25): 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 1 memory leak (40 bytes).Largest number used: 40 bytes.Total allocations: 40 bytes.Visual Leak Detector is now exiting.

2.3 StackWalkMethod = safe 时的输出

标准输出窗显示:

ptr = 012aa388, *ptr = 00000001.Elapsed Time:  18 ms

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.    Using the "safe" (but slow) stack walking method.WARNING: Visual Leak Detector detected memory leaks!---------- Block 1 at 0x012AA388: 4 bytes ----------  Leak Hash: 0x9281F97B, Count: 1, Total 4 bytes  Call Stack (TID 30696):    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 (13): testVLD.exe!testFun() + 0x7 bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (10): testVLD.exe!testFun() + 0xC bytes    e:\cworkspace\qt 5.9\qtdemo\testvld\main.cpp (25): 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 1 memory leak (40 bytes).Largest number used: 40 bytes.Total allocations: 40 bytes.Visual Leak Detector is now exiting.

2.4 输出结果对比

  • StackWalkMethod = fast时,耗时 1 ms,此次检测输出了全部的调用堆栈。
  • StackWalkMethod = safe时,耗时 18 ms,也检测输出了全部的调用堆栈。

关键词: