Function lhHeapRealloc_entry

src/heap.cpp:49–91

lhHeapRealloc replacement — unified alloc/realloc/free (Lua allocator protocol) r3 = heap (ignored), r4 = old_ptr, r5 = old_size, r6 = new_size

// lhHeapRealloc replacement — unified alloc/realloc/free (Lua allocator protocol)
//   r3 = heap (ignored), r4 = old_ptr, r5 = old_size, r6 = new_size
ppc_u32_result_t lhHeapRealloc_entry(ppc_u32_t heap, ppc_u32_t old_ptr, ppc_u32_t old_size, ppc_u32_t new_size) {
    uint32_t optr = static_cast<uint32_t>(old_ptr);
    uint32_t osize = static_cast<uint32_t>(old_size);
    uint32_t nsize = static_cast<uint32_t>(new_size);

    // Free
    if (nsize == 0) {
        if (optr && InArena(optr)) {
            mspace_free(g_mspace, GuestToHost(optr));
        }
        return 0;
    }

    // Alloc (no old pointer)
    if (!optr) {
        void* ptr = mspace_malloc(g_mspace, nsize);
        if (!ptr) {
            REXLOG_WARN("lhHeapRealloc: mspace_malloc({}) failed", nsize);
            return 0;
        }
        return HostToGuest(ptr);
    }

    // Realloc — old pointer outside our arena (pre-hook allocation)
    if (!InArena(optr)) {
        REXLOG_WARN("lhHeapRealloc: old ptr 0x{:08X} OOB, treating as new alloc({})", optr, nsize);
        void* ptr = mspace_malloc(g_mspace, nsize);
        if (!ptr) {
            REXLOG_WARN("lhHeapRealloc: mspace_malloc({}) failed", nsize);
            return 0;
        }
        return HostToGuest(ptr);
    }

    // Realloc — old pointer in our arena
    void* old_host = GuestToHost(optr);
    void* new_host = mspace_realloc(g_mspace, old_host, nsize);
    if (!new_host) {
        REXLOG_WARN("lhHeapRealloc: mspace_realloc({}) failed", nsize);
        return 0;
    }
    return HostToGuest(new_host);
}

// lh_PhysicalAllocCached replacement — redirects physical memory allocations
// to our native heap with proper alignment.