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New Peer Review Checklist for Embedded C Code
Here's a new peer review checklist to help improve the quality of your embedded C code.
To use the checklist, you should do a sit-down meeting with, ideally, three reviewers not including the code author. Divide the checklist up into three portions as indicated. Be sure to run decent static analysis before the review to safe reviewer time -- let the tools find the easy stuff before spending human time on the review.
After an initial orientation to what the code is supposed to do and relevant background, the review process is:
===============================================================
Peer Review Checklist: Embedded C Code
Before Review:
0 _____ Code compiles clean with extensive warning checks (e.g. MISRA C rules)
Reviewer #1:
1 _____ Commenting: top of file, start of function, code that needs an explanation
2 _____ Style is consistent and follows style guidelines
3 _____ Proper modularity, module size, use of .h files and #includes
4 _____ No orphans (redundant, dead, commented out, unused code & variables)
5 _____ Conditional expressions evaluate to a boolean value; no assignments
6 _____ Parentheses used to avoid operator precedence confusion
7 _____ All switch statements have a default clause; preferably an error trap
Reviewer #2:
8 _____ Single point of exit from each function
9 _____ Loop entry and exit conditions correct; minimum continue/break complexity
10 _____ Conditionals should be minimally nested (generally only one or two deep)
11 _____ All functions can be unit tested; SCC or SF complexity less than 10 to 15
12 _____ Use const and inline instead of #define; minimize conditional compilation
13 _____ Avoid use of magic numbers (constant values embedded in code)
14 _____ Use strong typing (includes: sized types, structs for coupled data, const)
15 _____ Variables have well chosen names and are initialized at definition
Reviewer #3:
16 _____ Minimum scope for all functions and variables; essentially no globals
17 _____ Concurrency issues? (locking, volatile keyword, minimize blocking time)
18 _____ Input parameter checking is done (style, completeness)
19 _____ Error handling for function returns is appropriate
20 _____ Null pointers, division by zero, null strings, boundary conditions handled
21 _____ Floating point use is OK (equality, NaN, INF, roundoff); use of fixed point
22 _____ Buffer overflow safety (bound checking, avoid unsafe string operations)
All Reviewers:
23 _____ Does the code match the detailed design (correct functionality)?
24 _____ Is the code as simple, obvious, and easy to review as possible?
For TWO Reviewers assign items: Reviewer#1: 1-11; 23-24 Reviewer#2: 12-24
Items that are covered with static analysis can be removed from checklist
Template 1/28/2018: Copyright CC BY 4.0, 2018, Philip Koopman
===============================================================
Additional material to help you with successful peer reviews:
To use the checklist, you should do a sit-down meeting with, ideally, three reviewers not including the code author. Divide the checklist up into three portions as indicated. Be sure to run decent static analysis before the review to safe reviewer time -- let the tools find the easy stuff before spending human time on the review.
After an initial orientation to what the code is supposed to do and relevant background, the review process is:
- The review leader picks the next few lines of code to be reviewed and makes sure everyone is ONLY focused on those few lines. Usually this is 5-10 lines encompassing a conditional structure, a basic block, or other generally unified small chunk within the code.
- Reviewers identify any code problems relevant to their part of the checklist. It's OK if they notice others, but they should focus on individually considering each item in their part of the checklist and ask "do I see a violation of this item" in just the small chunk of code being considered.
- Reviewer comments should be recorded in the form: "Line X seems to violate Checklist Item Y for the following reason." Do NOT suggest a fix -- just record the issue.
- When all comments have been recorded, go back to step 1. Continue to review up to a maximum of 2 hours. You should be covering about 100-200 lines of code per hour. Too fast and too slow are both a problem.
A text version of the checklist is below. You can also download an acrobat version here. Additional pointers to support materials are after the checklist. If you have a static analysis tool that automates any of the checklist item, feel free to replace that item with something else that's important to you.
===============================================================
Peer Review Checklist: Embedded C Code
Before Review:
0 _____ Code compiles clean with extensive warning checks (e.g. MISRA C rules)
Reviewer #1:
1 _____ Commenting: top of file, start of function, code that needs an explanation
2 _____ Style is consistent and follows style guidelines
3 _____ Proper modularity, module size, use of .h files and #includes
4 _____ No orphans (redundant, dead, commented out, unused code & variables)
5 _____ Conditional expressions evaluate to a boolean value; no assignments
6 _____ Parentheses used to avoid operator precedence confusion
7 _____ All switch statements have a default clause; preferably an error trap
Reviewer #2:
8 _____ Single point of exit from each function
9 _____ Loop entry and exit conditions correct; minimum continue/break complexity
10 _____ Conditionals should be minimally nested (generally only one or two deep)
11 _____ All functions can be unit tested; SCC or SF complexity less than 10 to 15
12 _____ Use const and inline instead of #define; minimize conditional compilation
13 _____ Avoid use of magic numbers (constant values embedded in code)
14 _____ Use strong typing (includes: sized types, structs for coupled data, const)
15 _____ Variables have well chosen names and are initialized at definition
Reviewer #3:
16 _____ Minimum scope for all functions and variables; essentially no globals
17 _____ Concurrency issues? (locking, volatile keyword, minimize blocking time)
18 _____ Input parameter checking is done (style, completeness)
19 _____ Error handling for function returns is appropriate
20 _____ Null pointers, division by zero, null strings, boundary conditions handled
21 _____ Floating point use is OK (equality, NaN, INF, roundoff); use of fixed point
22 _____ Buffer overflow safety (bound checking, avoid unsafe string operations)
All Reviewers:
23 _____ Does the code match the detailed design (correct functionality)?
24 _____ Is the code as simple, obvious, and easy to review as possible?
For TWO Reviewers assign items: Reviewer#1: 1-11; 23-24 Reviewer#2: 12-24
Items that are covered with static analysis can be removed from checklist
Template 1/28/2018: Copyright CC BY 4.0, 2018, Philip Koopman
===============================================================
Additional material to help you with successful peer reviews:
- A slide set about peer reviews
- A video tutorial on peer reviews: YouTube
- Peer review reporting spreadsheet blog post
- Other ideas for adding to the peer review checklist are at this blog entry. It's important to keep the checklist brief, so pick your battles and keep the items high level.
- SF complexity metric blog post
- Peer reviews and the 50/50 rule blog post
Embedded System Safety Lecture Video Series
I've posted the full series of embedded system safety lecture videos on YouTube. These are full-length narrated slides of the core set of safety topics from my new course. They concentrate on getting the big picture about failures, redundancy management, and safety integrity.
Obviously there is more to safety than just these topics. Supporting topics such as code quality and development approaches are currently just available as slides. You can see the full set of course slides here:
https://users.ece.cmu.edu/~koopman/lectures/index.html#642
- Safety Overview (slides)
- Dependability (slides)
- Critical Systems (slides)
- Safety Plan (slides)
- Safety Requirements (slides)
- Single Points of Failure (slides)
- Redundancy Management (slides)
- Critical System Isolation (slides)
- Safety Architectural Patterns (slides)
Obviously there is more to safety than just these topics. Supporting topics such as code quality and development approaches are currently just available as slides. You can see the full set of course slides here:
https://users.ece.cmu.edu/~koopman/lectures/index.html#642
Gta Vice City Android Game Free Download For Android Mobile
Gta Vice City Android Game Free Download For Android Mobile
Grand Theft Auto: Vice City – the famous computer game is now released and the android in which everyone played! Thanks to the Rockstar studio this game appeared on your android device. Welcome to the 80s.
A huge free world in which you are free to do whatever you want, you can just wander around the city admiring the beautiful views, or you can go through missions.
In honor of the decade of the game, Rockstar releases GTA Vice City for Android and other mobile OS – with HD resolution support
Feature
- Beautiful graphics
- A fascinating gameplay
- Customizable management
- Support for wireless joysticks and some USB gamepads
- Customizable graphics for different platforms
How to install Grand Theft Auto: Vice City APK?
Cache for the game Grand Theft Auto – Vice City: the folder from the archive to unpack in /sdcard/Android/obb/
- should get so /sdcard/Android/obb/com.rockstargames.gtavc/
- size of the decompressed cache 1.4 GB
