the custom SAL allocator is no longer used

ever since commit bc6a5d8e79e7d0e7d75ac107aa8e6aa275e434e9
    Date:   Wed Nov 15 16:52:44 2017 +0530
    Disable custom allocator
which makes FORCE_SYSALLOC redundant
which makes SYS_ALLOC redundant

Change-Id: I42e1d651473e7601e2280d9fb0662c89808c88f6
Reviewed-on: https://gerrit.libreoffice.org/58263
Tested-by: Jenkins
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>

9 files changed, 7 insertions, 690 deletions

diff --git a/configure.ac b/configure.ac
index c02a29120dff..fe9e5473c253 100644
--- a/configure.ac
+++ b/configure.ac
@@ -6639,20 +6639,8 @@ AC_SUBST(CLANGLIBDIR)
 # This makes --enable-lto build with clang work.
 AC_SUBST(LD_PLUGIN)
 
-dnl ===================================================================
-dnl allocator
-dnl ===================================================================
-AC_MSG_CHECKING([which memory allocator to use])
-if test "$with_alloc" = "system"; then
-    AC_MSG_RESULT([system])
-    ALLOC="SYS_ALLOC"
-fi
-if test "$with_alloc" = "internal" -o -z "$with_alloc"; then
-    AC_MSG_RESULT([internal])
-fi
 AC_CHECK_FUNCS(posix_fallocate, HAVE_POSIX_FALLOCATE=YES, [HAVE_POSIX_FALLOCATE=NO])
 AC_SUBST(HAVE_POSIX_FALLOCATE)
-AC_SUBST(ALLOC)
 
 dnl ===================================================================
 dnl Custom build version
diff --git a/jurt/source/pipe/staticsalhack.cxx b/jurt/source/pipe/staticsalhack.cxx
index a527d0965ce4..8b7e11b01049 100644
--- a/jurt/source/pipe/staticsalhack.cxx
+++ b/jurt/source/pipe/staticsalhack.cxx
@@ -8,7 +8,6 @@
  */
 
 #define DISABLE_DYNLOADING
-#define FORCE_SYSALLOC
 #define NO_CHILD_PROCESSES
 #undef SAL_LOG_INFO
 #undef SAL_LOG_WARN
diff --git a/sal/Library_sal.mk b/sal/Library_sal.mk
index 0227d6ffe32c..9d5822e36256 100644
--- a/sal/Library_sal.mk
+++ b/sal/Library_sal.mk
@@ -23,9 +23,6 @@ $(eval $(call gb_Library_add_defs,sal,\
 	$(if $(filter FUZZERS,$(BUILD_TYPE)), \
 		-DFORCE_DEFAULT_SIGNAL \
 	) \
-	$(if $(filter SYS_ALLOC,$(ALLOC))$(filter-out XTRUE,X$(ENABLE_RUNTIME_OPTIMIZATIONS)), \
-		-DFORCE_SYSALLOC \
-	) \
 	$(if $(filter IOS,$(OS)), \
 		-DNO_CHILD_PROCESSES \
 	) \
diff --git a/sal/inc/rtllifecycle.h b/sal/inc/rtllifecycle.h
index 528f4cc48a2f..4574ae821905 100644
--- a/sal/inc/rtllifecycle.h
+++ b/sal/inc/rtllifecycle.h
@@ -30,12 +30,6 @@ void rtl_cache_stop_threads(void);
 
 void rtl_cache_start_threads(void);
 
-void rtl_memory_init(void);
-
-void rtl_memory_fini(void);
-
-void ensureMemorySingleton(void);
-
 void rtl_locale_init(void);
 
 void rtl_locale_fini(void);
diff --git a/sal/osl/w32/dllentry.cxx b/sal/osl/w32/dllentry.cxx
index ffdaeb80dac9..8e8c0feda62c 100644
--- a/sal/osl/w32/dllentry.cxx
+++ b/sal/osl/w32/dllentry.cxx
@@ -131,7 +131,6 @@ static BOOL WINAPI RawDllMain( HINSTANCE, DWORD fdwReason, LPVOID )
                 rtl_locale_fini();
 
                 /* finalize memory management */
-                rtl_memory_fini();
                 rtl_cache_fini();
                 rtl_arena_fini();
             }
diff --git a/sal/rtl/alloc_cache.cxx b/sal/rtl/alloc_cache.cxx
index 41886c7ac235..28add71c7860 100644
--- a/sal/rtl/alloc_cache.cxx
+++ b/sal/rtl/alloc_cache.cxx
@@ -140,21 +140,6 @@ void rtl_cache_hash_rescale(
     }
 }
 
-inline sal_uIntPtr rtl_cache_hash_insert(
-    rtl_cache_type *        cache,
-    rtl_cache_bufctl_type * bufctl
-)
-{
-    rtl_cache_bufctl_type ** ppHead;
-
-    ppHead = &(cache->m_hash_table[RTL_CACHE_HASH_INDEX(cache, bufctl->m_addr)]);
-
-    bufctl->m_next = (*ppHead);
-    (*ppHead) = bufctl;
-
-    return bufctl->m_addr;
-}
-
 rtl_cache_bufctl_type * rtl_cache_hash_remove(
     rtl_cache_type * cache,
     sal_uIntPtr      addr
@@ -228,49 +213,6 @@ void rtl_cache_slab_destructor(void * obj, SAL_UNUSED_PARAMETER void *)
 /**
     @precond cache->m_slab_lock released.
 */
-rtl_cache_slab_type * rtl_cache_slab_create(rtl_cache_type * cache)
-{
-    rtl_cache_slab_type * slab = nullptr;
-    void *                addr;
-    sal_Size              size;
-
-    size = cache->m_slab_size;
-    addr = rtl_arena_alloc (cache->m_source, &size);
-    if (SAL_LIKELY(addr))
-    {
-        assert(size >= cache->m_slab_size);
-
-        if (cache->m_features & RTL_CACHE_FEATURE_HASH)
-        {
-            /* allocate slab struct from slab cache */
-            assert(cache != gp_cache_slab_cache);
-            slab = static_cast<rtl_cache_slab_type*>(rtl_cache_alloc (gp_cache_slab_cache));
-        }
-        else
-        {
-            /* construct embedded slab struct */
-            slab = RTL_CACHE_SLAB(addr, cache->m_slab_size);
-            (void) rtl_cache_slab_constructor (slab, nullptr);
-        }
-        if (SAL_LIKELY(slab))
-        {
-            slab->m_data = reinterpret_cast<sal_uIntPtr>(addr);
-
-            /* dynamic freelist initialization */
-            slab->m_bp = slab->m_data;
-            slab->m_sp = nullptr;
-        }
-        else
-        {
-            rtl_arena_free (cache->m_source, addr, size);
-        }
-    }
-    return slab;
-}
-
-/**
-    @precond cache->m_slab_lock released.
-*/
 void rtl_cache_slab_destroy(
     rtl_cache_type *      cache,
     rtl_cache_slab_type * slab
@@ -313,115 +255,6 @@ void rtl_cache_slab_destroy(
 }
 
 /**
-    @precond cache->m_slab_lock acquired.
-*/
-bool rtl_cache_slab_populate(rtl_cache_type * cache)
-{
-    rtl_cache_slab_type * slab;
-
-    RTL_MEMORY_LOCK_RELEASE(&(cache->m_slab_lock));
-    slab = rtl_cache_slab_create (cache);
-    RTL_MEMORY_LOCK_ACQUIRE(&(cache->m_slab_lock));
-    if (slab)
-    {
-        /* update buffer start addr w/ current color */
-        slab->m_bp += cache->m_ncolor;
-
-        /* update color for next slab */
-        cache->m_ncolor += cache->m_type_align;
-        if (cache->m_ncolor > cache->m_ncolor_max)
-            cache->m_ncolor = 0;
-
-        /* update stats */
-        cache->m_slab_stats.m_mem_total += cache->m_slab_size;
-
-        /* insert onto 'free' queue */
-        QUEUE_INSERT_HEAD_NAMED(&(cache->m_free_head), slab, slab_);
-    }
-    return (slab != nullptr);
-}
-
-/**
-    Allocate a buffer from slab layer; used by magazine layer.
-*/
-void * rtl_cache_slab_alloc (rtl_cache_type * cache)
-{
-    void                * addr = nullptr;
-    rtl_cache_slab_type * head;
-
-    RTL_MEMORY_LOCK_ACQUIRE(&(cache->m_slab_lock));
-
-    head = &(cache->m_free_head);
-    if (head->m_slab_next != head || rtl_cache_slab_populate (cache))
-    {
-        rtl_cache_slab_type   * slab;
-        rtl_cache_bufctl_type * bufctl;
-
-        slab = head->m_slab_next;
-        assert(slab->m_ntypes < cache->m_ntypes);
-
-        if (!slab->m_sp)
-        {
-            /* initialize bufctl w/ current 'slab->m_bp' */
-            assert(slab->m_bp < slab->m_data + cache->m_ntypes * cache->m_type_size + cache->m_ncolor_max);
-            if (cache->m_features & RTL_CACHE_FEATURE_HASH)
-            {
-                /* allocate bufctl */
-                assert(cache != gp_cache_bufctl_cache);
-                bufctl = static_cast<rtl_cache_bufctl_type*>(rtl_cache_alloc (gp_cache_bufctl_cache));
-                if (!bufctl)
-                {
-                    /* out of memory */
-                    RTL_MEMORY_LOCK_RELEASE(&(cache->m_slab_lock));
-                    return nullptr;
-                }
-
-                bufctl->m_addr = slab->m_bp;
-                bufctl->m_slab = reinterpret_cast<sal_uIntPtr>(slab);
-            }
-            else
-            {
-                /* embedded bufctl */
-                bufctl = reinterpret_cast<rtl_cache_bufctl_type*>(slab->m_bp);
-            }
-            bufctl->m_next = nullptr;
-
-            /* update 'slab->m_bp' to next free buffer */
-            slab->m_bp += cache->m_type_size;
-
-            /* assign bufctl to freelist */
-            slab->m_sp = bufctl;
-        }
-
-        /* pop front */
-        bufctl = slab->m_sp;
-        slab->m_sp = bufctl->m_next;
-
-        /* increment usage, check for full slab */
-        if ((slab->m_ntypes += 1) == cache->m_ntypes)
-        {
-            /* remove from 'free' queue */
-            QUEUE_REMOVE_NAMED(slab, slab_);
-
-            /* insert onto 'used' queue (tail) */
-            QUEUE_INSERT_TAIL_NAMED(&(cache->m_used_head), slab, slab_);
-        }
-
-        /* update stats */
-        cache->m_slab_stats.m_alloc     += 1;
-        cache->m_slab_stats.m_mem_alloc += cache->m_type_size;
-
-        if (cache->m_features & RTL_CACHE_FEATURE_HASH)
-            addr = reinterpret_cast<void*>(rtl_cache_hash_insert (cache, bufctl));
-        else
-            addr = bufctl;
-    }
-
-    RTL_MEMORY_LOCK_RELEASE(&(cache->m_slab_lock));
-    return addr;
-}
-
-/**
     Return a buffer to slab layer; used by magazine layer.
 */
 void rtl_cache_slab_free(
@@ -531,22 +364,6 @@ void rtl_cache_magazine_clear(
 /**
     @precond cache->m_depot_lock acquired.
 */
-inline void rtl_cache_depot_enqueue(
-    rtl_cache_depot_type *    depot,
-    rtl_cache_magazine_type * mag
-)
-{
-    /* enqueue empty magazine */
-    mag->m_mag_next = depot->m_mag_next;
-    depot->m_mag_next = mag;
-
-    /* update depot stats */
-    depot->m_mag_count++;
-}
-
-/**
-    @precond cache->m_depot_lock acquired.
-*/
 inline rtl_cache_magazine_type * rtl_cache_depot_dequeue(
     rtl_cache_depot_type * depot
 )
@@ -571,77 +388,6 @@ inline rtl_cache_magazine_type * rtl_cache_depot_dequeue(
     return mag;
 }
 
-/**
-    @precond cache->m_depot_lock acquired.
-*/
-inline rtl_cache_magazine_type * rtl_cache_depot_exchange_alloc(
-    rtl_cache_type *          cache,
-    rtl_cache_magazine_type * empty
-)
-{
-    rtl_cache_magazine_type * full;
-
-    assert(!empty || empty->m_mag_used == 0);
-
-    /* dequeue full magazine */
-    full = rtl_cache_depot_dequeue (&(cache->m_depot_full));
-    if (full && empty)
-    {
-        /* enqueue empty magazine */
-        rtl_cache_depot_enqueue (&(cache->m_depot_empty), empty);
-    }
-
-    assert(!full || (full->m_mag_used > 0));
-
-    return full;
-}
-
-/**
-    @precond cache->m_depot_lock acquired.
-*/
-inline rtl_cache_magazine_type * rtl_cache_depot_exchange_free(
-    rtl_cache_type *          cache,
-    rtl_cache_magazine_type * full
-)
-{
-    rtl_cache_magazine_type * empty;
-
-    assert(!full || (full->m_mag_used > 0));
-
-    /* dequeue empty magazine */
-    empty = rtl_cache_depot_dequeue (&(cache->m_depot_empty));
-    if (empty && full)
-    {
-        /* enqueue full magazine */
-        rtl_cache_depot_enqueue (&(cache->m_depot_full), full);
-    }
-
-    assert(!empty || (empty->m_mag_used == 0));
-
-    return empty;
-}
-
-/**
-    @precond cache->m_depot_lock acquired.
-*/
-bool rtl_cache_depot_populate(rtl_cache_type * cache)
-{
-    rtl_cache_magazine_type * empty = nullptr;
-
-    if (cache->m_magazine_cache)
-    {
-        /* allocate new empty magazine */
-        RTL_MEMORY_LOCK_RELEASE(&(cache->m_depot_lock));
-        empty = static_cast<rtl_cache_magazine_type*>(rtl_cache_alloc (cache->m_magazine_cache));
-        RTL_MEMORY_LOCK_ACQUIRE(&(cache->m_depot_lock));
-        if (empty)
-        {
-            /* enqueue (new) empty magazine */
-            rtl_cache_depot_enqueue (&(cache->m_depot_empty), empty);
-        }
-    }
-    return (empty != nullptr);
-}
 
 void rtl_cache_constructor(void * obj)
 {
@@ -991,73 +737,13 @@ void * SAL_CALL rtl_cache_alloc(rtl_cache_type * cache) SAL_THROW_EXTERN_C()
     if (!cache)
         return nullptr;
 
-    if (alloc_mode == AllocMode::SYSTEM)
-    {
-        obj = rtl_allocateMemory(cache->m_type_size);
-        if (obj && cache->m_constructor)
-        {
-            if (!(cache->m_constructor)(obj, cache->m_userarg))
-            {
-                /* construction failure */
-                rtl_freeMemory(obj);
-                obj = nullptr;
-            }
-        }
-        return obj;
-    }
-
-    RTL_MEMORY_LOCK_ACQUIRE(&(cache->m_depot_lock));
-    if (SAL_LIKELY(cache->m_cpu_curr))
+    obj = rtl_allocateMemory(cache->m_type_size);
+    if (obj && cache->m_constructor)
     {
-        for (;;)
-        {
-            /* take object from magazine layer */
-            rtl_cache_magazine_type *curr, *prev, *temp;
-
-            curr = cache->m_cpu_curr;
-            if (curr && (curr->m_mag_used > 0))
-            {
-                obj = curr->m_objects[--curr->m_mag_used];
-                cache->m_cpu_stats.m_alloc += 1;
-                RTL_MEMORY_LOCK_RELEASE(&(cache->m_depot_lock));
-
-                return obj;
-            }
-
-            prev = cache->m_cpu_prev;
-            if (prev && (prev->m_mag_used > 0))
-            {
-                temp = cache->m_cpu_curr;
-                cache->m_cpu_curr = cache->m_cpu_prev;
-                cache->m_cpu_prev = temp;
-
-                continue;
-            }
-
-            temp = rtl_cache_depot_exchange_alloc (cache, prev);
-            if (temp)
-            {
-                cache->m_cpu_prev = cache->m_cpu_curr;
-                cache->m_cpu_curr = temp;
-
-                continue;
-            }
-
-            /* no full magazine: fall through to slab layer */
-            break;
-        }
-    }
-    RTL_MEMORY_LOCK_RELEASE(&(cache->m_depot_lock));
-
-    /* alloc buffer from slab layer */
-    obj = rtl_cache_slab_alloc (cache);
-    if (obj && (cache->m_constructor))
-    {
-        /* construct object */
         if (!(cache->m_constructor)(obj, cache->m_userarg))
         {
             /* construction failure */
-            rtl_cache_slab_free (cache, obj);
+            rtl_freeMemory(obj);
             obj = nullptr;
         }
     }
@@ -1071,73 +757,12 @@ void SAL_CALL rtl_cache_free(
 {
     if (obj && cache)
     {
-        if (alloc_mode == AllocMode::SYSTEM)
-        {
-            if (cache->m_destructor)
-            {
-                /* destruct object */
-                (cache->m_destructor)(obj, cache->m_userarg);
-            }
-            rtl_freeMemory(obj);
-            return;
-        }
-
-        RTL_MEMORY_LOCK_ACQUIRE(&(cache->m_depot_lock));
-
-        for (;;)
-        {
-            /* return object to magazine layer */
-            rtl_cache_magazine_type *curr, *prev, *temp;
-
-            curr = cache->m_cpu_curr;
-            if (curr && (curr->m_mag_used < curr->m_mag_size))
-            {
-                curr->m_objects[curr->m_mag_used++] = obj;
-                cache->m_cpu_stats.m_free += 1;
-                RTL_MEMORY_LOCK_RELEASE(&(cache->m_depot_lock));
-
-                return;
-            }
-
-            prev = cache->m_cpu_prev;
-            if (prev && (prev->m_mag_used == 0))
-            {
-                temp = cache->m_cpu_curr;
-                cache->m_cpu_curr = cache->m_cpu_prev;
-                cache->m_cpu_prev = temp;
-
-                continue;
-            }
-
-            temp = rtl_cache_depot_exchange_free (cache, prev);
-            if (temp)
-            {
-                cache->m_cpu_prev = cache->m_cpu_curr;
-                cache->m_cpu_curr = temp;
-
-                continue;
-            }
-
-            if (rtl_cache_depot_populate(cache))
-            {
-                continue;
-            }
-
-            /* no empty magazine: fall through to slab layer */
-            break;
-        }
-
-        RTL_MEMORY_LOCK_RELEASE(&(cache->m_depot_lock));
-
-        /* no space for constructed object in magazine layer */
         if (cache->m_destructor)
         {
             /* destruct object */
             (cache->m_destructor)(obj, cache->m_userarg);
         }
-
-        /* return buffer to slab layer */
-        rtl_cache_slab_free (cache, obj);
+        rtl_freeMemory(obj);
     }
 }
 
diff --git a/sal/rtl/alloc_fini.cxx b/sal/rtl/alloc_fini.cxx
index 1d70d5c0c788..3745e900c86d 100644
--- a/sal/rtl/alloc_fini.cxx
+++ b/sal/rtl/alloc_fini.cxx
@@ -23,28 +23,6 @@
 
 namespace
 {
-    struct rtlMemorySingleton
-    {
-        rtlMemorySingleton()
-        {
-            rtl_memory_init();
-        }
-        ~rtlMemorySingleton()
-        {
-            rtl_memory_fini();
-        }
-    };
-    class theMemorySingleton
-        : public rtl::Static<rtlMemorySingleton, theMemorySingleton>{};
-}
-
-void ensureMemorySingleton()
-{
-    theMemorySingleton::get();
-}
-
-namespace
-{
     struct rtlCacheSingleton
     {
         rtlCacheSingleton()
diff --git a/sal/rtl/alloc_global.cxx b/sal/rtl/alloc_global.cxx
index 1a3a26f00069..9ceba4f4120f 100644
--- a/sal/rtl/alloc_global.cxx
+++ b/sal/rtl/alloc_global.cxx
@@ -30,239 +30,12 @@
 #include <rtllifecycle.h>
 #include <oslmemory.h>
 
-AllocMode alloc_mode = AllocMode::UNSET;
-
-#if !defined(FORCE_SYSALLOC)
-static void determine_alloc_mode()
-{
-    assert(alloc_mode == AllocMode::UNSET);
-    alloc_mode = AllocMode::SYSTEM;
-}
-
-static const sal_Size g_alloc_sizes[] =
-{
-    /* powers of 2**(1/4) */
-    4 *    4,           6 *    4,
-    4 *    8, 5 *    8, 6 *    8, 7 *    8,
-    4 *   16, 5 *   16, 6 *   16, 7 *   16,
-    4 *   32, 5 *   32, 6 *   32, 7 *   32,
-    4 *   64, 5 *   64, 6 *   64, 7 *   64,
-    4 *  128, 5 *  128, 6 *  128, 7 *  128,
-    4 *  256, 5 *  256, 6 *  256, 7 *  256,
-    4 *  512, 5 *  512, 6 *  512, 7 *  512,
-    4 * 1024, 5 * 1024, 6 * 1024, 7 * 1024,
-    4 * 2048, 5 * 2048, 6 * 2048, 7 * 2048,
-    4 * 4096
-};
-
-#define RTL_MEMORY_CACHED_LIMIT 4 * 4096
-#define RTL_MEMORY_CACHED_SIZES (SAL_N_ELEMENTS(g_alloc_sizes))
-
-static rtl_cache_type * g_alloc_caches[RTL_MEMORY_CACHED_SIZES] =
-{
-    nullptr,
-};
-
-#define RTL_MEMALIGN       8
-#define RTL_MEMALIGN_SHIFT 3
-
-static rtl_cache_type * g_alloc_table[RTL_MEMORY_CACHED_LIMIT >> RTL_MEMALIGN_SHIFT] =
-{
-    nullptr,
-};
-
-static rtl_arena_type * gp_alloc_arena = nullptr;
-
-void * rtl_allocateMemory_CUSTOM(sal_Size n) SAL_THROW_EXTERN_C()
-{
-    void * p = nullptr;
-    if (n > 0)
-    {
-        char *     addr;
-        sal_Size   size = RTL_MEMORY_ALIGN(n + RTL_MEMALIGN, RTL_MEMALIGN);
-
-        assert(RTL_MEMALIGN >= sizeof(sal_Size));
-        if (n >= SAL_MAX_SIZE - (RTL_MEMALIGN + RTL_MEMALIGN - 1))
-        {
-            /* requested size too large for roundup alignment */
-            return nullptr;
-        }
-
-try_alloc:
-        if (size <= RTL_MEMORY_CACHED_LIMIT)
-            addr = static_cast<char*>(rtl_cache_alloc(g_alloc_table[(size - 1) >> RTL_MEMALIGN_SHIFT]));
-        else
-            addr = static_cast<char*>(rtl_arena_alloc (gp_alloc_arena, &size));
-
-        if (addr)
-        {
-            reinterpret_cast<sal_Size*>(addr)[0] = size;
-            p = addr + RTL_MEMALIGN;
-        }
-        else if (!gp_alloc_arena)
-        {
-            ensureMemorySingleton();
-            if (gp_alloc_arena)
-            {
-                /* try again */
-                goto try_alloc;
-            }
-        }
-    }
-    return p;
-}
-
-void rtl_freeMemory_CUSTOM (void * p) SAL_THROW_EXTERN_C()
-{
-    if (p)
-    {
-        char *   addr = static_cast<char*>(p) - RTL_MEMALIGN;
-        sal_Size size = reinterpret_cast<sal_Size*>(addr)[0];
-
-        if (size <= RTL_MEMORY_CACHED_LIMIT)
-            rtl_cache_free(g_alloc_table[(size - 1) >> RTL_MEMALIGN_SHIFT], addr);
-        else
-            rtl_arena_free (gp_alloc_arena, addr, size);
-    }
-}
-
-void * rtl_reallocateMemory_CUSTOM (void * p, sal_Size n) SAL_THROW_EXTERN_C()
-{
-    if (n > 0)
-    {
-        if (p)
-        {
-            void *   p_old = p;
-            sal_Size n_old = reinterpret_cast<sal_Size*>( static_cast<char*>(p) - RTL_MEMALIGN  )[0] - RTL_MEMALIGN;
-
-            p = rtl_allocateMemory (n);
-            if (p)
-            {
-                memcpy (p, p_old, std::min(n, n_old));
-                rtl_freeMemory (p_old);
-            }
-        }
-        else
-        {
-            p = rtl_allocateMemory (n);
-        }
-    }
-    else if (p)
-    {
-        rtl_freeMemory (p);
-        p = nullptr;
-    }
-    return p;
-}
-
-#endif
-
-void rtl_memory_init()
-{
-#if !defined(FORCE_SYSALLOC)
-    {
-        /* global memory arena */
-        assert(!gp_alloc_arena);
-
-        gp_alloc_arena = rtl_arena_create (
-            "rtl_alloc_arena",
-            2048,     /* quantum */
-            0,        /* w/o quantum caching */
-            nullptr,        /* default source */
-            rtl_arena_alloc,
-            rtl_arena_free,
-            0         /* flags */
-        );
-        assert(gp_alloc_arena);
-    }
-    {
-        sal_Size size;
-        int i, n = RTL_MEMORY_CACHED_SIZES;
-
-        for (i = 0; i < n; i++)
-        {
-            char name[RTL_CACHE_NAME_LENGTH + 1];
-            (void) snprintf (name, sizeof(name), "rtl_alloc_%" SAL_PRIuUINTPTR, g_alloc_sizes[i]);
-            g_alloc_caches[i] = rtl_cache_create (name, g_alloc_sizes[i], 0, nullptr, nullptr, nullptr, nullptr, nullptr, 0);
-        }
-
-        size = RTL_MEMALIGN;
-        for (i = 0; i < n; i++)
-        {
-            while (size <= g_alloc_sizes[i])
-            {
-                g_alloc_table[(size - 1) >> RTL_MEMALIGN_SHIFT] = g_alloc_caches[i];
-                size += RTL_MEMALIGN;
-            }
-        }
-    }
-#endif
-}
-
-void rtl_memory_fini()
-{
-#if !defined(FORCE_SYSALLOC)
-    int i, n;
-
-    /* clear g_alloc_table */
-    // cppcheck-suppress sizeofwithsilentarraypointer
-    memset (g_alloc_table, 0, sizeof(g_alloc_table));
-
-    /* cleanup g_alloc_caches */
-    for (i = 0, n = RTL_MEMORY_CACHED_SIZES; i < n; i++)
-    {
-        if (g_alloc_caches[i])
-        {
-            rtl_cache_destroy (g_alloc_caches[i]);
-            g_alloc_caches[i] = nullptr;
-        }
-    }
-
-    /* cleanup gp_alloc_arena */
-    if (gp_alloc_arena)
-    {
-        rtl_arena_destroy (gp_alloc_arena);
-        gp_alloc_arena = nullptr;
-    }
-#endif
-}
-
-void * rtl_allocateMemory_SYSTEM(sal_Size n)
-{
-    return malloc (n);
-}
-
-void rtl_freeMemory_SYSTEM(void * p)
-{
-    free (p);
-}
-
-void * rtl_reallocateMemory_SYSTEM(void * p, sal_Size n)
-{
-    return realloc (p, n);
-}
-
 void* SAL_CALL rtl_allocateMemory(sal_Size n) SAL_THROW_EXTERN_C()
 {
     SAL_WARN_IF(
         n >= SAL_MAX_INT32, "sal.rtl",
         "suspicious massive alloc " << n);
-#if !defined(FORCE_SYSALLOC)
-    while (true)
-    {
-        if (alloc_mode == AllocMode::CUSTOM)
-        {
-            return rtl_allocateMemory_CUSTOM(n);
-        }
-        if (alloc_mode == AllocMode::SYSTEM)
-        {
-            return rtl_allocateMemory_SYSTEM(n);
-        }
-        determine_alloc_mode();
-    }
-#else
-    return rtl_allocateMemory_SYSTEM(n);
-#endif
+    return malloc (n);
 }
 
 void* SAL_CALL rtl_reallocateMemory(void * p, sal_Size n) SAL_THROW_EXTERN_C()
@@ -270,44 +43,12 @@ void* SAL_CALL rtl_reallocateMemory(void * p, sal_Size n) SAL_THROW_EXTERN_C()
     SAL_WARN_IF(
         n >= SAL_MAX_INT32, "sal.rtl",
         "suspicious massive alloc " << n);
-#if !defined(FORCE_SYSALLOC)
-    while (true)
-    {
-        if (alloc_mode == AllocMode::CUSTOM)
-        {
-            return rtl_reallocateMemory_CUSTOM(p,n);
-        }
-        if (alloc_mode == AllocMode::SYSTEM)
-        {
-            return rtl_reallocateMemory_SYSTEM(p,n);
-        }
-        determine_alloc_mode();
-    }
-#else
-    return rtl_reallocateMemory_SYSTEM(p,n);
-#endif
+    return realloc (p, n);
 }
 
 void SAL_CALL rtl_freeMemory(void * p) SAL_THROW_EXTERN_C()
 {
-#if !defined(FORCE_SYSALLOC)
-    while (true)
-    {
-        if (alloc_mode == AllocMode::CUSTOM)
-        {
-            rtl_freeMemory_CUSTOM(p);
-            return;
-        }
-        if (alloc_mode == AllocMode::SYSTEM)
-        {
-            rtl_freeMemory_SYSTEM(p);
-            return;
-        }
-        determine_alloc_mode();
-    }
-#else
-    rtl_freeMemory_SYSTEM(p);
-#endif
+    free (p);
 }
 
 void * SAL_CALL rtl_allocateZeroMemory(sal_Size n) SAL_THROW_EXTERN_C()
diff --git a/sal/rtl/alloc_impl.hxx b/sal/rtl/alloc_impl.hxx
index 38d0f92d733c..bdacba04a29d 100644
--- a/sal/rtl/alloc_impl.hxx
+++ b/sal/rtl/alloc_impl.hxx
@@ -212,10 +212,6 @@ typedef CRITICAL_SECTION rtl_memory_lock_type;
 */
 #define RTL_CACHE_FLAG_NOMAGAZINE   (1 << 13) /* w/o magazine layer */
 
-enum class AllocMode { CUSTOM, SYSTEM, UNSET };
-
-extern AllocMode alloc_mode;
-
 #endif // INCLUDED_SAL_RTL_ALLOC_IMPL_HXX
 
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