To get a trial key
fill out the form below
Team License (standard version)
Enterprise License (extended version)
* By clicking this button you agree to our Privacy Policy statement

** This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Request our prices
New License
License Renewal
--Select currency--
USD
EUR
GBP
RUB
* By clicking this button you agree to our Privacy Policy statement

** This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
To get the licence for your open-source project, please fill out this form
* By clicking this button you agree to our Privacy Policy statement

** This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
To get the licence for your open-source project, please fill out this form
* By clicking this button you agree to our Privacy Policy statement

** This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
I am interested to try it on the platforms:
* By clicking this button you agree to our Privacy Policy statement

** This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Message submitted.

Your message has been sent. We will email you at


If you haven't received our response, please do the following:
check your Spam/Junk folder and click the "Not Spam" button for our message.
This way, you won't miss messages from our team in the future.

>
>
Why is the number of the line where an …

Why is the number of the line where an issue was found sometimes absent in the Error List in PVS-Studio?

Jun 28 2010

Sometimes the PVS-Studio code analyzer seems to find an issue in the code on which it generates a message, specifies the file name but does not show the number of the line with the issue as shown in the figure.

0072_Line_number_is_absent/image1.png

I should note right away that the analyzer does not specify numbers of lines for some errors in the demo version, but now we do not speak about the limitations of the demo-version.

Such a behavior is determined by two specific features:

  • the specified file (dso.y in the figure) is an automatically generated file that is not quite correct.
  • the Error List window used in PVS-Studio to generate messages does not show line numbers for those files which are physically absent in the specified folder on the disk.

To understand this case, let's open the Output Window that also contains messages generated by the PVS-Studio analyzer.

0072_Line_number_is_absent/image2.png

It is written in this window that the problem is in the file dso.y, line 467. But if we look at the project's files, it will appear that either there is no such a file (dso.y) at all in the project or it is situated in some other folder. Well, is this the fault of the PVS-Studio analyzer? Not quite.

Code analyzers, as well as compilers, get information about position in a file relying on special #line directives which are always present in preprocessed files. You can easily find such a directive (in one line) in a common preprocessed file:

#line 72 "c:\\program files\\

microsoft visual studio 8\\vc\\include\\stdio.h"

Positions of code specified in messages are obtained from this information.

Let's now look at the automatically generated dso.cpp file. You can see the following thing there:

#line 47 "dso.y"

Note that, first, the specified path is not complete and, second, the dso.y file might be absent at all on the computer you check the project on.

So, the absence of a line number in a message generated by the PVS-Studio analyzer means that the file is not found in the specified folder. You should find this file manually and, as well manually, look through the specified code lines.

Popular related articles
PVS-Studio ROI

Date: Jan 30 2019

Author: Andrey Karpov

Occasionally, we're asked a question, what monetary value the company will receive from using PVS-Studio. We decided to draw up a response in the form of an article and provide tables, which will sho…
The Evil within the Comparison Functions

Date: May 19 2017

Author: Andrey Karpov

Perhaps, readers remember my article titled "Last line effect". It describes a pattern I've once noticed: in most cases programmers make an error in the last line of similar text blocks. Now I want t…
Technologies used in the PVS-Studio code analyzer for finding bugs and potential vulnerabilities

Date: Nov 21 2018

Author: Andrey Karpov

A brief description of technologies used in the PVS-Studio tool, which let us effectively detect a large number of error patterns and potential vulnerabilities. The article describes the implementati…
Static analysis as part of the development process in Unreal Engine

Date: Jun 27 2017

Author: Andrey Karpov

Unreal Engine continues to develop as new code is added and previously written code is changed. What is the inevitable consequence of ongoing development in a project? The emergence of new bugs in th…
Characteristics of PVS-Studio Analyzer by the Example of EFL Core Libraries, 10-15% of False Positives

Date: Jul 31 2017

Author: Andrey Karpov

After I wrote quite a big article about the analysis of the Tizen OS code, I received a large number of questions concerning the percentage of false positives and the density of errors (how many erro…
PVS-Studio for Java

Date: Jan 17 2019

Author: Andrey Karpov

In the seventh version of the PVS-Studio static analyzer, we added support of the Java language. It's time for a brief story of how we've started making support of the Java language, how far we've co…
The Ultimate Question of Programming, Refactoring, and Everything

Date: Apr 14 2016

Author: Andrey Karpov

Yes, you've guessed correctly - the answer is "42". In this article you will find 42 recommendations about coding in C++ that can help a programmer avoid a lot of errors, save time and effort. The au…
Appreciate Static Code Analysis!

Date: Oct 16 2017

Author: Andrey Karpov

I am really astonished by the capabilities of static code analysis even though I am one of the developers of PVS-Studio analyzer myself. The tool surprised me the other day as it turned out to be sma…
The Last Line Effect

Date: May 31 2014

Author: Andrey Karpov

I have studied many errors caused by the use of the Copy-Paste method, and can assure you that programmers most often tend to make mistakes in the last fragment of a homogeneous code block. I have ne…
How PVS-Studio Proved to Be More Attentive Than Three and a Half Programmers

Date: Oct 22 2018

Author: Andrey Karpov

Just like other static analyzers, PVS-Studio often produces false positives. What you are about to read is a short story where I'll tell you how PVS-Studio proved, just one more time, to be more atte…

Comments (0)

Next comments

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
This website uses cookies and other technology to provide you a more personalized experience. By continuing the view of our web-pages you accept the terms of using these files. If you don't want your personal data to be processed, please, leave this site.
Learn More →
Accept