How to debug C++ memory errors using Purify Plus?

Purify Plus method for debugging C++ memory errors: Install Purify Plus and add environment variables. Compile the program using the -purify compilation flag. Use purify to run the debugger and see the errors reported. Fix the error and run Purify Plus again to verify the fix.

#How to use Purify Plus to debug C++ memory errors?

Introduction
Purify Plus is a powerful memory debugger that helps detect memory errors in C++ programs. It identifies and fixes issues such as memory leaks, free-after-use, and memory access violations.

Using Purify Plus

1. Install Purify Plus

   • From the Purify Plus official website Download and install Purify Plus.

2. Add the Purify Plus environment variable

   • Add the Purify Plus installation directory to the system path and set the PURIFY environment variable , points to the Purify Plus main executable.

3. Compile the debugger

   • Compile the program code using the compile flag -purify to enable the debugging capabilities of Purify Plus.
   • For example, in GCC: g++ -g -purify your_program.cpp

4. Run Purify debugging

   • Run Purify, passing the program to be debugged as a parameter.
   • For example, purify your_program

5. ##Check the memory error report

   Purify Plus monitors programs in real time and reports any memory errors found. The error report will show the type of error, where it occurred, and possible causes.

Practical case

Consider the following C++ code:

#include <iostream>

int main() {
    int* ptr = new int;
    *ptr = 10;
    delete ptr;
    return 0;
}

Compile and run this code, Purify Plus will Report a use-after-free error. The error report will state that after deleting the ptr, there are still attempts to access it.

Verify FixAfter fixing the error, run the program again using Purify Plus. If the error is fixed, Purify Plus will no longer report the error.

ConclusionPurify Plus is a powerful tool that can help identify and fix memory errors in C++. By following these steps, you can use Purify Plus to debug and verify your program's memory usage.

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