CodeNullCheck - VS Code Extension

A powerful VS Code extension that performs thorough code review by detecting:

• Nullptr/null issues: Checks for null pointer dereferences, redundant null checks, and unsafe dereferences
• Redundant database calls: Identifies duplicate queries, N+1 problems, and inefficient database access patterns

Features

Nullptr Detection

• Detects potential nullptr/null dereferences before they cause crashes
• Identifies redundant null checks
• Warns about assignments to null
• Detects double null checks
• Flags unsafe pointer dereferences

Database Call Analysis

• Detects duplicate/identical database queries
• Identifies redundant DB calls within close proximity
• Warns about database calls inside loops (N+1 problem)
• Detects un-cached database results
• Reports inefficient query patterns

Installation

Option 1: From Source

# Navigate to the extension directory
cd C:\Users\om naladkar\Desktop\code-review-extension

# Install dependencies
npm install

# Package the extension
npm install -g vsce
vsce package

# Install the .vsix file
code --install-extension code-review-assistant-1.0.0.vsix

Option 2: Development Mode

cd C:\Users\om naladkar\Desktop\code-review-extension
npm install
code .
# Press F5 to run in debug mode

Usage

Commands

Open Command Palette (Ctrl+Shift+P) and search for "Code Review":

• Code Review: Run Review - Run full code review on current file
• Code Review: Check Nullptr Issues - Check only nullptr/null issues
• Code Review: Check Redundant DB Calls - Check only database call issues
• Code Review: Show Problems - Open the Problems panel

Context Menu

Right-click in the editor and select "Run Code Review" for quick access.

Auto-Review

The extension automatically runs analysis on:

• File save
• File open
• Active editor change

Configuration

Customize the extension in VS Code Settings (File > Preferences > Settings):

{
    "codeReview.showNullptrWarnings": true,
    "codeReview.showDbCallWarnings": true,
    "codeReview.enableOnSave": true,
    "codeReview.dbCallPatterns": [
        "db.query",
        "db.find",
        "db.get",
        "connection.execute",
        "connection.query",
        "session.query",
        "Entity.objects",
        "collection.find",
        "repository.",
        "DataContext"
    ],
    "codeReview.nullptrPatterns": [
        "null",
        "nullptr",
        "None",
        "nil",
        "undefined"
    ]
}

Supported Languages

• C/C++ (.c, .cpp, .h, .hpp)
• JavaScript/TypeScript (.js, .ts, .jsx, .tsx)
• Python (.py)
• Java (.java)
• C# (.cs)

Issue Types

Nullptr Issues (Code: NULLPTR_*)

Database Issues (Code: DB_*)

Example Detections

Nullptr Detection

// BEFORE (will be flagged)
if (ptr->GetData() != nullptr) {  // NULLPTR_001
    // ...
}

// AFTER (correct)
if (ptr != nullptr) {
    ptr->GetData();
}

Redundant DB Call Detection

// BEFORE (will be flagged)
const user = await db.find({ id: 1 });
const sameUser = await db.find({ id: 1 });  // DB_001

// AFTER (correct)
const user = await db.find({ id: 1 });
// Reuse 'user' variable

Troubleshooting

Extension not loading

1. Check Output panel (View > Output) for errors
2. Run Developer: Reload Window
3. Reinstall the extension

No issues detected

1. Ensure file type is supported
2. Check that patterns match your code style in settings
3. Try running manual review with the command

Contributing

To extend this extension:

1. Add new detection patterns to NullptrDetector or RedundantDBCallDetector
2. Update package.json with new configuration options
3. Add tests for new functionality

License

MIT License

Author

Code Review Tools Team