hakmem/core/tiny_debug.h

#ifndef TINY_DEBUG_H
#define TINY_DEBUG_H

#if !HAKMEM_BUILD_RELEASE

#include <stdio.h>
#include <stdlib.h>
#include <stdatomic.h>
#include "hakmem_tiny_superslab.h"
#include "hakmem_tiny.h"

static inline int tiny_alloc_debug_enabled(void) {
    static int g_debug = -1;
    if (__builtin_expect(g_debug == -1, 0)) {
        const char* e = getenv("HAKMEM_TINY_ALLOC_DEBUG");
        g_debug = (e && atoi(e) != 0) ? 1 : 0;
    }
    return g_debug;
}

static inline void tiny_alloc_dump_tls_state(int class_idx, const char* tag, TinyTLSSlab* tls) {
    if (!tiny_alloc_debug_enabled()) return;
    fprintf(stderr,
            "[ALLOC-DBG:%s] class=%d tls_ss=%p slab_idx=%u meta=%p slab_base=%p\n",
            tag ? tag : "?", class_idx,
            (void*)tls->ss, (unsigned)tls->slab_idx,
            (void*)tls->meta, (void*)tls->slab_base);
    SuperSlab* ss = tls->ss;
    if (!(ss && ss->magic == SUPERSLAB_MAGIC)) {
        fprintf(stderr,
                "  tls_ss invalid: ss=%p magic=0x%llx\n",
                (void*)ss,
                ss ? (unsigned long long)ss->magic : 0ull);
        return;
    }
    int cap = ss_slabs_capacity(ss);
    fprintf(stderr,
            "  ss active_slabs=%u cap=%d bitmap=0x%08x total_active=%u ref=%u\n",
            ss->active_slabs, cap, ss->slab_bitmap,
            atomic_load_explicit(&ss->total_active_blocks, memory_order_relaxed),
            atomic_load_explicit(&ss->refcount, memory_order_relaxed));
    int limit = (cap < 6) ? cap : 6;
    for (int i = 0; i < limit; i++) {
        uint32_t mask = 1u << i;
        TinySlabMeta* meta = &ss->slabs[i];
        fprintf(stderr,
                "    slab%02d active=%d used=%u cap=%u freelist=%p owner=%u class=%u\n",
                i, (ss->slab_bitmap & mask) ? 1 : 0,
                (unsigned)meta->used, (unsigned)meta->capacity,
                meta->freelist, meta->owner_tid_low, meta->class_idx);
    }
}

#else // HAKMEM_BUILD_RELEASE

// No-op stubs for release builds
static inline int tiny_alloc_debug_enabled(void) {
    return 0;
}

static inline void tiny_alloc_dump_tls_state(int class_idx, const char* tag, TinyTLSSlab* tls) {
    (void)class_idx;
    (void)tag;
    (void)tls;
    // No-op in release builds
}

#endif // !HAKMEM_BUILD_RELEASE

#endif // TINY_DEBUG_H