// Box: Legacy Backend (Phase 12)
// Purpose: Per-class SuperSlabHead backend (legacy implementation)
//
// Responsibilities:
//   - Maintain per-class SuperSlabHead (g_superslab_heads)
//   - Initialize SuperSlabHead for a class
//   - Expand SuperSlabHead by allocating new chunks
//   - Find chunk for a pointer (chunk walk)
//   - Legacy hint box (per-thread, per-class bump allocation)
//
// Dependencies:
//   - ss_allocation_box (superslab_allocate, superslab_free, superslab_init_slab)
//   - hakmem_tiny_config (g_tiny_class_sizes)
//
// API:
//   - init_superslab_head() - initialize SuperSlabHead for a class
//   - expand_superslab_head() - expand SuperSlabHead by allocating new chunk
//   - find_chunk_for_ptr() - find chunk for a pointer
//   - hak_tiny_alloc_superslab_backend_legacy() - per-class backend
//   - hak_tiny_alloc_superslab_backend_hint() - hint optimization
//   - hak_tiny_ss_hint_record() - hint recording

#ifndef SS_LEGACY_BACKEND_BOX_H
#define SS_LEGACY_BACKEND_BOX_H

#include "hakmem_tiny_superslab.h"

// Global per-class SuperSlabHeads
extern SuperSlabHead* g_superslab_heads[TINY_NUM_CLASSES_SS];

// SuperSlabHead management
SuperSlabHead* init_superslab_head(int class_idx);
int expand_superslab_head(SuperSlabHead* head);
SuperSlab* find_chunk_for_ptr(void* ptr, int class_idx);

// Legacy backend API
void* hak_tiny_alloc_superslab_backend_legacy(int class_idx);

// Hint box (optional optimization)
void* hak_tiny_alloc_superslab_backend_hint(int class_idx);
void hak_tiny_ss_hint_record(int class_idx, SuperSlab* ss, int slab_idx);

#endif // SS_LEGACY_BACKEND_BOX_H