Memory Audit

Audit code for memory safety issues specific to resource-constrained embedded systems.

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What This Skill Analyzes

Stack Usage

• Functions with large local arrays or structs (risk of stack overflow)
• Deep call chains and recursion (stack depth estimation)
• Task/thread stack size adequacy (FreeRTOS xTaskCreate stack parameter)
• Alloca/VLA usage (variable-length arrays on stack)

Heap Fragmentation

• Frequent small allocations and deallocations in hot paths
• Mixed allocation sizes causing fragmentation over time
• Missing deallocation (memory leaks)
• Allocation in ISRs or time-critical code (heap locks can cause priority inversion)

Static Allocation Patterns

• Global/static buffer sizing (too large wastes RAM, too small causes overflow)
• Compile-time vs runtime allocation trade-offs
• .bss and .data section usage
• PSRAM vs internal SRAM placement decisions

Platform-Specific Concerns

• ESP32: DRAM/IRAM split, PSRAM cache line alignment, DMA-capable memory
• ARM Cortex-M: Stack/heap collision, MPU configuration, scatter file layout
• AVR: 2KB SRAM constraint, PROGMEM usage for constants

How To Use

/memory-audit src/platforms/esp/32/drivers/
/memory-audit src/fl/channels/
/memory-audit Check if LED buffer allocation is safe for 1000+ LEDs on ESP32

What You'll Get

• Memory usage breakdown by category (stack, heap, static)
• Risk assessment for each finding (Critical/High/Medium/Low)
• Specific recommendations with code examples
• Platform-aware advice (e.g., "move to PSRAM" vs "reduce buffer size")