Warnings & Diagnostics

The extension provides two kinds of diagnostics: memory layout optimization warnings and GC pressure hints.

Optimization Warnings

When a struct wastes space due to sub-optimal field ordering, a yellow warning underline appears on the struct name:

⚠️ Struct layout can be optimized: 40 bytes → 24 bytes (saves 16 bytes)

These also appear in the Problems panel (Ctrl+Shift+M / Cmd+Shift+M).

Fields with large alignment (int64, float64, pointers) should be placed first to minimize padding.

GC Pressure Hints

When pointer fields (maps, channels, functions, pointers, strings, slices) are not grouped at the start of the struct, a blue hint underline appears:

💡 Struct GC scan range can be reduced: 72 bytes → 48 bytes (reduces GC pressure)

Grouping pointer-containing fields reduces the number of bytes the garbage collector must scan.

Promotion to warnings

Set goStructAnalyzer.gcPressureSeverityWarning: true to show GC pressure issues as yellow warnings instead of blue hints.

Disabling

Setting	Effect
goStructAnalyzer.enableStructOptimizationWarnings	Toggle all optimization warnings
goStructAnalyzer.enableGCPressureWarnings	Toggle GC pressure hints