Can a Dedicated Tool Expose Unwarranted Assumptions in C/C ?

How to Demonstrate Unwarranted Assumptions in C/C

Introduction

Assuming certain behaviors in C and C without fully understanding their implementation can lead to code errors. To address this issue, it is beneficial to have a dedicated tool that demonstrates the breakability of these assumptions on various platforms.

Improving the Test Tool

• Expand the Test Suite: Include more comprehensive tests that cover a broader range of assumptions regarding character sets, integer representation, and platform-specific behaviors.
• Provide Clear Test Results: Enhance the output to clearly indicate whether each assumption holds or fails.
• Support Different Platforms: Allow users to run the tests on multiple platforms to compare results and identify platform-specific variations.

Recommended Tests

• Integer Arithmetic:

  • integer overflow and wrapping
  • left-shifting integer values
  • right-shifting signed integers

• Character Representation:

  • ASCII character encoding assumptions
  • character size and signedness

• Pointers and Memory Manipulation:

  • storing function pointers in void*
  • detecting stack growth direction
  • endianness of integer data

• Operator Evaluation Order:

  • undefined order of evaluation for most operators
  • exceptions to the evaluation order rules

• Floating-Point Behavior:

  • checking for IEEE compliance
• Additional tests based on user feedback and common assumptions identified in Stack Overflow questions.

Call for Participation

We encourage you to contribute to this project by:

• Suggesting additional tests
• Providing results from running the tests on different platforms
• Discussing and clarifying test observations
• Sharing patches and new ideas on the project's GitHub repository.

Conclusion

By raising awareness of unwarranted assumptions in C and C , this test tool empowers programmers to write more robust and portable code. We hope this tool serves as a valuable resource for educating developers about these subtle and potentially problematic assumptions.

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