VS Code extension with inline cache hints

[AveryClapp]

Feature Description

VS Code extension that shows cache behavior inline in the editor.

UI

int sum = 0;
for (int i = 0; i < n; i++) {
    sum += arr[i];  // ✓ 99.2% hit rate (L1)
}

for (int i = 0; i < n; i += 64) {
    sum += arr[i];  // ⚠ 45.3% hit rate (L2 miss)
}

Features

• CodeLens annotations with hit rates
• Underline hot lines in red/yellow/green
• Hover for detailed stats
• Quick fix suggestions ("Add __restrict here")
• Run analysis from command palette

Implementation

• VS Code extension boilerplate
• Call cache-explore CLI
• Parse JSON output
• Map line numbers to editor
• Cache results (don't re-run on every edit)

Files

• vscode-extension/ (new package)
• vscode-extension/src/extension.ts

Publishing

• VS Code Marketplace
• Open VSX for VS Codium users

References

• VS Code Extension API