Writing custom rules in cppcheck

Adding Coding Rules

If both are available, the Java API will be more fully-featured than what's available for XPath, and is generally preferable. Before implementing a new coding rule, you should consider whether it is specific to your own context or might benefit others. If it might benefit others, you can propose it on the Community Forum. If there is shared emory creative writing events, then writing custom rules in cppcheck might be implemented for you directly in the related language plugin.

It means less maintenance for you, and benefit to others. SonarQube provides a quick and easy way to add new coding rules directly via the web interface for certain languages using XPath 1. If you're writing rules for XML, skip down to the Adding your rule to the server section once you've got your rules written.

For other languages how to access a variable, writing custom rules in cppcheck example, in XPath is less obvious, so we've provided tools. The rules must be written in XPath version 1. Each language's SSLR Toolkit is a standalone application that displays the AST for a piece of code source that you feed into it, allowing you to read the node names and attributes from your code sample and essay writing for money uk your XPath creative writing workshops pittsburgh. Knowing the XPath language is the only prerequisite, and there are a lot of tutorials on XPath online.

Here's the AST for our sample:. The XPath language provides a way to write coding rules by navigating this AST, and the SSLR Toolkit for the language will give you the ability to test your new rules against your sample code.

These are the guidelines that SonarSource uses internally to specify new rules. Rules in community plugins are not required to adhere to these guidelines. They are provided here only writing custom rules in cppcheck case they are useful. Note that fields "title", "description" and "message" have a different format when the rule type is "Hotspot".

When a reference is made to a standards specification, e. MISRA, the following steps must also be taken:. If needed, references to other rules should be listed under a "See also" heading. If a "See" heading exists in the rule, then the "See also" title should be at the h3 level. Otherwise, use an h2 for it. Why list references to other rules under "see also" instead of "see"? The see section is used to support the current rule, and one rule cannot be used as justification for another rule.

Now that you've fleshed celts clothes primary homework help the description, you should have a fairly clear idea of what type writing custom rules in cppcheck rule this is, but to be explicit:.

Code Smell - Something that will confuse a maintainer or cause her to stumble in her reading of the writing custom rules in cppcheck. Vulnerability - Something that's wrong which impacts the application's security and therefore writing custom rules in cppcheck a fix. Hotspot - An optional protection is missing and the developer needs to do a review before deciding whether to apply a fix. Sometimes the line writing custom rules in cppcheck Bug and Code Smell is fuzzy. When in doubt, ask yourself: "Is code that breaks this rule doing what the programmer probably intended?

Everything else is a Code Smell. The main differences between vulnerabilities and hotspots are explained on the security-hotspots page. During the specification of a rule, the following guidelines might also help:.

When assessing the default severity of a rule, the first thing to do is ask yourself "what's the worst thing that could happen? To do that, ask yourself these specific questions:. Rules can have 0-n tags, although most creative writing course chicago should have at least one.

Many of the common-across-languages tags are described in the issues docs. The goal of this section is to help define the value of this constant and to unify the way those estimations are done to prevent having some big discrepancies among language plugins.

Then use the following writing custom rules in cppcheck to get the remediation cost according to the required remediation effort and to the language:. For rules using either the "linear" or "linear with offset" remediation functions, the "Effort To Fix" field must be fed on each issue and this field is used to compute the remediation cost.

For any given rule, highlighting behavior should be consistent across languages within the bounds of what's relevant for each language. When writing custom rules in cppcheck, each issue should be raised on the line of code that needs correction, with highlighting limited to the portion of the line to be corrected. For example:. When correcting an issue requires action across multiple lines, the issue should be raised on the lowest block that encloses all relevant lines.

For example an issue for:. When an issue could be made clearer by highlighting multiple code segments, such as a method complexity issue, additional issue locations may be highlighted, and additional messages may optionally be logged for those locations.

In general, these guidelines should be followed for secondary issue locations:. Starting with the subject, such as "Files", will ensure that all rules applying to files will be grouped together. Compliant Solution - demonstrating how to fix college essay writers for pay previous issues. Good to have but not required for rules that detect bugs.

When displayed in SonarQube, any code or keywords in the description should be enclosed in tags. They will be translated in the final output. Issue messages should contain the remediation message for bug and quality rules.

For potential-bug rules, it should make it explicit that a manual review is required. It should be in the imperative mood "Do x"and therefore start with a verb. An issue message should always end with a period '. Any piece of code in the rule message should be double-quoted and not single-quoted. Moreover, if an issue is triggered because a number was above a threshold value, then both the number and the threshold value should be mentioned in the issue message.

Using generic exceptions such as ErrorRuntimeExceptionThrowableand Exception prevents calling methods from handling true, system-generated exceptions differently than application-generated errors. Exceptions Generic exceptions in the signatures of overriding methods are ignored. Recommended Secure Coding Practices - describing all the ways to mitigate the risk. Docs 8. Setup and Upgrade. Analyzing Source Code. User Guide. Project Administration. Instance Administration.

Adding Coding Rules. Developing a plugin. Deploying to the Marketplace. SonarQube Community Product News. Sample Specification Generic exceptions should not be thrown Using generic exceptions such as ErrorWriting custom rules in cppcheckThrowableand Exception prevents calling methods from handling true, system-generated exceptions differently than application-generated errors.

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Writing custom rules in cppcheck



Hello everyone, I am new in cppcheck And I want to writing new rule about syntax error in "if" function but I don't know how to notice space in cppcheck's source code. Thank you. Cppcheck was not designed for stylistic checkers. Cppcheck was designed to look for bugs. I can't recommend any specific tool though.

The formatting problems are fixed automatically then. In the Cppcheck project we use astyle and I am very happy about it. Thanks for your reply. Ngo Quang Hai Nguyen-the person who created this discussion-is my teammate. Few days ago, we have decided to contribute to cppcheck with checking naming convention.

We see you use token to browse all contents of files by each element as syntax-tree. And one more thing, we created a new class for new naming convention rules but we don't know how to call our check method to check code file as your check class.

See attach file. Your code should work already, as far as I see. How do you compile it? I want to warn you before you waste your time too much. If you create this checker and it works as you want..

I don't want that this is added in the official Cppcheck. I am very skeptic about adding checkers that warn about indentation. It could be ok if the indentation is truly misleading. But warnings about ugly code is not ok. If you want to publish it, so those who want it can compile and use it, that is ok also..

I want to check about stylistic, because I think in big source code which have a thousand line of code. I'm trying to implement my class to check "description of function before the declare of it", I think it important to help other know "What does this function do".

Like your cppcheck, before the declare of function your description help me a lot when I try to study about it. But, in this case I just want to identified the declare of function I want to ignore about function calling or implement My plan is get line of token which is function declare and check the lines previous is comment description or not. What should I do? I appreciated about your warning My coding skill is too bad I want to do for myself to improve my coding skill and style of code, and help other who also want to use it.

I hope so One more thing, sorry for late to reply However, I think it's very interesting. You are not interested in the function calls right? You just want to see where the functions are "described" and declared. Don't loop through tokens at all. Loop through all functions. Something like:. Oh no! Some styles failed to load. Help Create Join Login. Operations Management. IT Management. Project Management. Resources Blog Articles Deals. Menu Help Create Join Login. Home Browse cppcheck Discussion.

Forum: General Discussion. Creator: Ngo Quang Hai Nguyen. Created: Updated: Ngo Quang Hai Nguyen - If you would like to refer to this comment somewhere else in this project, copy and paste the following link:. Vo Quang Chanh - Dear sir, Thanks for your reply. In our point of view, after reading cppcheck-design and debug some function After use cppcheck to check.

Could you give us some advises? We looking forward to hearing from you. Thanks you! How we can get line number of tok when it matched with string what we expect? If you just want to compile and use this yourself, that is ok. I'm trying to implement my class to check "description of function before the declare of it" I am not sure what you mean..

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Cppcheck manual

Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Git stats commits. Failed to load latest commit information. View code. What do these do? Are these perfect configuration files?

About Configuration files that allow cppcheck to provide better static analysis results Topics c cpp cppcheck static-analysis. Releases No releases published. Packages 0 No packages published. You signed in with another tab or window. Reload to refresh your session. It is unlikely that you will find all the bugs in your software through testing and instrumenting. Cppcheck can detect some of the bugs that you have missed.

Articles about writing rules. This article talks about the internal data in Cppcheck. This article discuss the philosphy of Cppcheck - how we try to avoid false warnings. Cppcheck has many different kinds of checks. A full list is available.

To suggest a new checker, please use Trac. Use Trac to report any problems: Trac. You are welcome to contribute. Help is needed. Write tickets to Trac about issues you find from Cppcheck. If you test open source projects and write bug reports to them, check the issues in Found bugs section, and write links to the bug reports you have created e. Cppcheck can check all source files in a directory:.

It is recommended that you try both. It is possible that you will get different results so that to find most bugs you need to use both approaches. So the filter must start with the given start folder. To exclude a file or folder, there are two options. The first option is to only provide the paths and files you want to check. This option is only valid when supplying an input directory. To ignore multiple directories supply the -i multiple times.

However there is an experimental option to use the Clang parser instead. Technically, Cppcheck will execute clang with its -ast-dump option. The Clang output is then imported and converted into our normal Cppcheck format. And then normal Cppcheck analysis is performed on that.

You can also pass a custom Clang executable to the option by using e. You can also pass it with a path. On Windows it will append the. Suggestions for making the code faster. These suggestions are only based on common knowledge. Implementation defined behavior. Configuration problems. If you get such output then your code is ok but your cppcheck configuration could be improved.

If your templates are recursive this can lead to slow analysis that uses a lot of memory. Cppcheck will write information messages when there are potential problems. The Cppcheck GUI has a few options that are not available in the command line directly. To use these options you can import a GUI project file. We want to keep the command line tool usage simple and limit the options by intention. To ignore certain folders in the project you can use -i.

This will skip analysis of source files in the foo folder. Now run Cppcheck like this:. To ignore certain folders you can use -i. Both options will analyze all available configurations in the project s. Limiting on a single configuration:. In the Cppcheck GUI you have the choice to only analyze a single debug configuration. If you want to use this choice on the command line then create a Cppcheck GUI project with this activated and then import the GUI project file on the command line.

In Linux you can use for instance the bear build ear utility to generate a compile database from arbitrary build tools:. If you use --project then Cppcheck will use the preprocessor settings from the imported project. By default Cppcheck will check all preprocessor configurations except those that have error in them. So the above code will by default be analyzed both with A defined and without A defined. When you use -D , cppcheck will by default only check the given configuration and nothing else.

This is how compilers work. But you can use --force or --max-configs to override the number of configurations. Another useful flag might be -U.

Cppcheck - A tool for static C/C++ code analysis

bit portability. Check if there is bit portability issues: assign address to/from int/long - casting address from/to integer when returning from function Assert. Warn if there are side effects in assert statements (since this cause different behaviour in debug/release builds). Cppcheck is designed to be able to analyze your C/C++ code even if it has non-standard syntax (common in embedded projects). Supported code and platforms: You can check non-standard code that contains various compiler extensions, inline assembly code, etc. Cppcheck should be compilable by any C++ compiler that handles the latest C++ standard. Writing rules. Articles about writing rules. Part 1 - Getting started Part 2 - Data representation Part 3 - Introduction to C++ rules. Cppcheck design. This article talks about the internal data in Cppcheck. This article discuss the philosphy of Cppcheck - how we try to avoid false warnings. Clients and plugins. Cppcheck can be used from many.


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