C/C++ Code Checker

Analyzes C/C++ code for maintainability issues: extra large files/functions and circular dependencies between modules.

Workflow

1. Identify scan target - If the user doesn't specify a file or directory, ask: "Which directory or file should I scan?"
2. Determine check type - Ask or infer which checks to run:
   • File/Function size analysis
   • Circular dependency detection
   • Both (default for full analysis)
3. Run the scan - Execute the appropriate script(s)
4. Present findings - Show the report and summarize key issues
5. Offer help - Ask if the user wants refactoring assistance

Size Analysis

Scan for extra large files and functions:

scripts/scan_cpp_size.py <path> [options]

Options:

• -o, --output <file> - Write report to file
• -f, --file-threshold <n> - Large file threshold (default: 2000 effective lines)
• -F, --function-threshold <n> - Large function threshold (default: 50 effective lines)

Example:

scripts/scan_cpp_size.py ./src --file-threshold 1500 --function-threshold 40 -o size_report.md

Circular Dependency Detection

Detect circular dependencies between directory modules:

scripts/circular_header_check.py <path> [options]

Options:

• -o, --output <file> - Write report to file
• -v, --verbose - Verbose output
• --no-gn - Skip GN build file parsing

Example:

scripts/circular_header_check.py ./src -o circular_report.md

The circular dependency checker:

• Parses GN build files (BUILD.gn, *.gni) for include paths
• Groups files by directory modules (handles src/ and include/ as one component)
• Detects when module A includes files from module B, which includes A

After Finding Issues

When issues are found:

1. Prioritize by impact - Start with the largest issues first
2. Understand context - Read the code to understand responsibility
3. Ask the user - "Would you like help refactoring this?"

Refactoring Guidance

Issue Type	Reference
Large functions	references/refactoring.md
Circular dependencies	See references/circular-deps.md

What Counts as "Large"?

Category	Default Threshold	Rationale
Files	2000 effective lines	Hard to navigate, understand
Functions	50 effective lines	Beyond cognitive fit, hard to test

Effective lines exclude blank lines, comments, and preprocessor directives.

File Extensions Scanned

.c, .cpp, .cc, .cxx, .c++, .h, .hpp, .hh, .hxx, .h++, .inl, .inc