valgrind

安装步骤： 　　一：首先安装简版CodeBlocks sudo apt install codeblocks 　　二：把编译环境，C库、C++库和Boost库装好 sudo apt install build-essential 　　三：安装 CodeBlocks 的调试组件 Valgrind 用来探测内存泄露的 sudo apt install valgrind 　　四：安装CodeBlocks常用插件 sudo apt install codeblocks-contrib 　　一：首先安装简版CodeBlocks sudo apt install codeblocks 　　二：把编译环境，C库、C++库和Boost库装好 sudo apt install build-essential 　　三：安装 CodeBlocks 的调试组件 Valgrind 用来探测内存泄露的 sudo apt install valgrind 　　四：安装CodeBlocks常用插件 sudo apt install codeblocks-contrib

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/chengqiuming/article/details/90311664 #include<iostream> #include<stdlib.h> using namespace std; void func(){ int *x=(int *)malloc( 10 * sizeof ( int ) ) ; x[10]=0; } int main(){ func(); cout<<"done"<<endl; return 0; } [root@localhost charpter05]# g++ -g 0508test.cpp -o 0508 [root@localhost charpter05]# ./0508 done [root@localhost charpter05]# valgrind ./0508 ==16719== Memcheck, a memory error detector ==16719== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al. ==16719== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/chengqiuming/article/details/90311919 内存读写越界是指访问了没有权限访问的内存地址空间，比如访问数组时越界，对动态内存访问超出了申请时内存的大小范围。 #include<stdlib.h> #include<iostream> using namespace std; int main(){ int len=4; int *pt=(int *)malloc(len*sizeof(int)); int *p=pt; for(int i=0;i<len;i++) p++; *p=5; cout<<"the value of p is "<<*p<<endl; return 0; } [root@localhost charpter05]# g++ -g 0511.cpp -o 0511 [root@localhost charpter05]# ./0511 the value of p is 5 [root@localhost charpter05]# valgrind ./0511 ==18335== Memcheck, a memory error detector ==18335== Copyright (C) 2002-2017, and

转载： https://www.cnblogs.com/bodhitree/p/5850212.html core dump又叫核心转储, 当程序运行过程中发生异常, 程序异常退出时, 由操作系统把程序当前的内存状况存储在一个core文件中, 叫core dump. (linux中如果内存越界会收到SIGSEGV信号，然后就会core dump) 在程序运行的过程中，有的时候我们会遇到Segment fault(段错误)这样的错误。这种看起来比较困难，因为没有任何的栈、trace信息输出。该种类型的错误往往与指针操作相关。往往可以通过这样的方式进行定位。 一 造成segment fault，产生core dump的可能原因 1.内存访问越界 2 多线程程序使用了线程不安全的函数。 3 多线程读写的数据未加锁保护。对于会被多个线程同时访问的全局数据，应该注意加锁保护，否则很容易造成core dump 4 非法指针 a) 使用空指针 b) 随意使用指针转换。一个指向一段内存的指针，除非确定这段内存原先就分配为某种结构或类型，或者这种结构或类型的数组，否则不要将它转换为这种结构或类型的指针，而应该将这段内存拷贝到一个这种结构或类型中，再访问这个结构或类型。这是因为如果这段内存的开始地址不是按照这种结构或类型对齐的，那么访问它时就很容易因为bus error而core dump. 5

I just wrote a code in C++ which does some string manipulation, but when I ran valgrind over, it shows some possible memory leaks. Debugging the code to granular level I wrote a simple C++ program looking like: #include<iostream> #include<cstdlib> using namespace std; int main() { std::string myname("Is there any leaks"); exit(0); } and running valgrind over it I got: ==20943== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 26 from 1) ==20943== malloc/free: in use at exit: 360,645 bytes in 12,854 blocks. ==20943== malloc/free: 65,451 allocs, 52,597 frees, 2,186,968 bytes allocated. =

I want to write a CMakeLists.txt so that I can run my tests normally or with valgrind. I have seen much on integrating ctest with valgrind but all with the assumption that you want to set up a server to submit test results to a dart dashboard. I just want to run the tests on my machine and see the results on the command line. If I have to do a cmake -D VALGRIND=ON thats fine, but I'd rather generate tests named "foo" and "valgrind_foo" if possible. KlingonJoe I use valgrind for my memory check. To configure valgrind, I define the following variables in my build system: find_program(