hakmem/core/box/tiny_route_env_box.h

// tiny_route_env_box.h - Route snapshot for Tiny front (Heap vs Legacy)
// 役割:
//   - 起動時に「各クラスが TinyHeap を使うか」をスナップショットし、ホットパスでは LUT 1 回に縮約する。
//   - HAKMEM_TINY_HEAP_PROFILE / HAKMEM_TINY_HEAP_BOX / HAKMEM_TINY_HEAP_CLASSES の組合せをここで解決する。
#pragma once

#include <stdint.h>
#include <stdlib.h>
#include "../hakmem_tiny_config.h"
#include "tiny_heap_env_box.h"

#include "smallobject_hotbox_v3_env_box.h"
#include "smallobject_hotbox_v4_env_box.h"

typedef enum {
    TINY_ROUTE_LEGACY = 0,
    TINY_ROUTE_HEAP = 1,             // TinyHeap v1
    TINY_ROUTE_HOTHEAP_V2 = 2,       // TinyHotHeap v2
    TINY_ROUTE_SMALL_HEAP_V3 = 3,    // SmallObject HotHeap v3 (C7-first,研究箱)
    TINY_ROUTE_SMALL_HEAP_V4 = 4,    // SmallObject HotHeap v4 (stub, route未使用)
} tiny_route_kind_t;

extern tiny_route_kind_t g_tiny_route_class[TINY_NUM_CLASSES];
extern int g_tiny_route_snapshot_done;

static inline void tiny_route_snapshot_init(void) {
    for (int i = 0; i < TINY_NUM_CLASSES; i++) {
        if (small_heap_v4_class_enabled((uint8_t)i)) {
            g_tiny_route_class[i] = TINY_ROUTE_SMALL_HEAP_V4;
        } else if (small_heap_v3_class_enabled((uint8_t)i)) {
            g_tiny_route_class[i] = TINY_ROUTE_SMALL_HEAP_V3;
        } else if (tiny_hotheap_v2_class_enabled((uint8_t)i)) {
            g_tiny_route_class[i] = TINY_ROUTE_HOTHEAP_V2;
        } else if (tiny_heap_box_enabled() && tiny_heap_class_route_enabled(i)) {
            g_tiny_route_class[i] = TINY_ROUTE_HEAP;
        } else {
            g_tiny_route_class[i] = TINY_ROUTE_LEGACY;
        }
    }
    g_tiny_route_snapshot_done = 1;
}

static inline tiny_route_kind_t tiny_route_for_class(uint8_t ci) {
    if (__builtin_expect(!g_tiny_route_snapshot_done, 0)) {
        tiny_route_snapshot_init();
    }
    if (__builtin_expect(ci >= TINY_NUM_CLASSES, 0)) {
        return TINY_ROUTE_LEGACY;
    }
    return g_tiny_route_class[ci];
}

static inline int tiny_route_is_heap_kind(tiny_route_kind_t route) {
    return route == TINY_ROUTE_HEAP ||
           route == TINY_ROUTE_HOTHEAP_V2 ||
           route == TINY_ROUTE_SMALL_HEAP_V3 ||
           route == TINY_ROUTE_SMALL_HEAP_V4;
}

// C7 front が TinyHeap を使うか（Route snapshot 経由で判定）
static inline int tiny_c7_front_uses_heap(void) {
    return tiny_route_is_heap_kind(tiny_route_for_class(7));
}

// C6 front が TinyHeap を使うか（Route snapshot 経由で判定）
static inline int tiny_c6_front_uses_heap(void) {
    return tiny_route_is_heap_kind(tiny_route_for_class(6));
}