/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
#ident "$Id$"
/*======
This file is part of PerconaFT.


Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved.

    PerconaFT is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License, version 2,
    as published by the Free Software Foundation.

    PerconaFT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with PerconaFT.  If not, see <http://www.gnu.org/licenses/>.

----------------------------------------

    PerconaFT is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License, version 3,
    as published by the Free Software Foundation.

    PerconaFT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with PerconaFT.  If not, see <http://www.gnu.org/licenses/>.
======= */

#ident "Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved."

#include <portability/toku_config.h>

#include <toku_portability.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#if defined(HAVE_MALLOC_H)
# include <malloc.h>
#elif defined(HAVE_SYS_MALLOC_H)
# include <sys/malloc.h>
#endif
#include <dlfcn.h>
#include <toku_race_tools.h>
#include "memory.h"
#include "toku_assert.h"
#include <portability/toku_atomic.h>

static malloc_fun_t  t_malloc  = 0;
static malloc_aligned_fun_t t_malloc_aligned = 0;
static malloc_fun_t  t_xmalloc = 0;
static malloc_aligned_fun_t t_xmalloc_aligned = 0;
static free_fun_t    t_free    = 0;
static realloc_fun_t t_realloc = 0;
static realloc_aligned_fun_t t_realloc_aligned = 0;
static realloc_fun_t t_xrealloc = 0;

static LOCAL_MEMORY_STATUS_S status;
int toku_memory_do_stats = 0;

static bool memory_startup_complete;

int
toku_memory_startup(void) {
    if (memory_startup_complete) {
        return 0;
    }
    memory_startup_complete = true;

    int result = 0;

#if defined(HAVE_M_MMAP_THRESHOLD)
    // initialize libc malloc
    size_t mmap_threshold = 64 * 1024; // 64K and larger should be malloced with mmap().
    int success = mallopt(M_MMAP_THRESHOLD, mmap_threshold);
    if (success) {
        status.mallocator_version = "libc";
        status.mmap_threshold = mmap_threshold;
    } else
        result = EINVAL;
#else
    // just a guess
    status.mallocator_version = "darwin";
    status.mmap_threshold = 16 * 1024;
#endif

    // jemalloc has a mallctl function, while libc malloc does not.  we can check if jemalloc 
    // is loaded by checking if the mallctl function can be found.  if it can, we call it 
    // to get version and mmap threshold configuration.
    typedef int (*mallctl_fun_t)(const char *, void *, size_t *, void *, size_t);
    mallctl_fun_t mallctl_f;
    mallctl_f = (mallctl_fun_t) dlsym(RTLD_DEFAULT, "mallctl");
    if (mallctl_f) { // jemalloc is loaded
        size_t version_length = sizeof status.mallocator_version;
        result = mallctl_f("version", &status.mallocator_version, &version_length, NULL, 0);
        if (result == 0) {
            size_t lg_chunk; // log2 of the mmap threshold
            size_t lg_chunk_length = sizeof lg_chunk;
            result  = mallctl_f("opt.lg_chunk", &lg_chunk, &lg_chunk_length, NULL, 0);
            if (result == 0)
                status.mmap_threshold = 1 << lg_chunk;
        }
    }

    return result;
}

static bool memory_shutdown_complete;

void
toku_memory_shutdown(void) {
    if (memory_shutdown_complete) {
        return;
    }
    memory_shutdown_complete = true;
}

void 
toku_memory_get_status(LOCAL_MEMORY_STATUS s) {
    *s = status;
}

// jemalloc's malloc_usable_size does not work with a NULL pointer, so we implement a version that works
static size_t
my_malloc_usable_size(void *p) {
    return p == NULL ? 0 : os_malloc_usable_size(p);
}

// Note that max_in_use may be slightly off because use of max_in_use is not thread-safe.
// It is not worth the overhead to make it completely accurate, but
// this logic is intended to guarantee that it increases monotonically.
// Note that status.sum_used and status.sum_freed increase monotonically
// and that status.max_in_use is declared volatile.
static inline void 
set_max(uint64_t sum_used, uint64_t sum_freed) {
    if (sum_used >= sum_freed) {
        uint64_t in_use = sum_used - sum_freed;
        uint64_t old_max;
        do {
            old_max = status.max_in_use;
        } while (old_max < in_use &&
                 !toku_sync_bool_compare_and_swap(&status.max_in_use, old_max, in_use));
    }
}

// Effect: Like toku_memory_footprint, except instead of passing p,
//   we pass toku_malloc_usable_size(p).
size_t 
toku_memory_footprint_given_usable_size(size_t touched, size_t usable)
{
    size_t pagesize = toku_os_get_pagesize();
    if (usable >= status.mmap_threshold) {
        int num_pages = (touched + pagesize) / pagesize;
        return num_pages * pagesize;
    }
    return usable;
}

// Effect: Return an estimate how how much space an object is using, possibly by
//   using toku_malloc_usable_size(p).
//   If p is NULL then returns 0.
size_t
toku_memory_footprint(void * p, size_t touched)
{
    if (!p) return 0;
    return toku_memory_footprint_given_usable_size(touched,
                                                   my_malloc_usable_size(p));
}

void *
toku_malloc(size_t size) {
#if __APPLE__
    if (size == 0) {
        return nullptr;
    }
#endif

    if (size > status.max_requested_size) {
        status.max_requested_size = size;
    }
    void *p = t_malloc ? t_malloc(size) : os_malloc(size);
    if (p) {
        TOKU_ANNOTATE_NEW_MEMORY(p, size); // see #4671 and https://bugs.kde.org/show_bug.cgi?id=297147
        if (toku_memory_do_stats) {
            size_t used = my_malloc_usable_size(p);
            toku_sync_add_and_fetch(&status.malloc_count, 1);
            toku_sync_add_and_fetch(&status.requested,size);
            toku_sync_add_and_fetch(&status.used, used);
            set_max(status.used, status.freed);
        }
    } else {
        toku_sync_add_and_fetch(&status.malloc_fail, 1);
        status.last_failed_size = size;
    }
  return p;
}

void *toku_malloc_aligned(size_t alignment, size_t size) {
#if __APPLE__
    if (size == 0) {
        return nullptr;
    }
#endif

    if (size > status.max_requested_size) {
        status.max_requested_size = size;
    }
    void *p = t_malloc_aligned ? t_malloc_aligned(alignment, size) : os_malloc_aligned(alignment, size);
    if (p) {
        TOKU_ANNOTATE_NEW_MEMORY(p, size); // see #4671 and https://bugs.kde.org/show_bug.cgi?id=297147
        if (toku_memory_do_stats) {
            size_t used = my_malloc_usable_size(p);
            toku_sync_add_and_fetch(&status.malloc_count, 1);
            toku_sync_add_and_fetch(&status.requested,size);
            toku_sync_add_and_fetch(&status.used, used);
            set_max(status.used, status.freed);
        }
    } else {
        toku_sync_add_and_fetch(&status.malloc_fail, 1);
        status.last_failed_size = size;
    }
  return p;
}

void *
toku_calloc(size_t nmemb, size_t size) {
    size_t newsize = nmemb * size;
    void *p = toku_malloc(newsize);
    if (p) memset(p, 0, newsize);
    return p;
}

void *
toku_realloc(void *p, size_t size) {
#if __APPLE__
    if (size == 0) {
        if (p != nullptr) {
            toku_free(p);
        }
        return nullptr;
    }
#endif

    if (size > status.max_requested_size) {
        status.max_requested_size = size;
    }
    size_t used_orig = p ? my_malloc_usable_size(p) : 0;
    void *q = t_realloc ? t_realloc(p, size) : os_realloc(p, size);
    if (q) {
        if (toku_memory_do_stats) {
            size_t used = my_malloc_usable_size(q);
            toku_sync_add_and_fetch(&status.realloc_count, 1);
            toku_sync_add_and_fetch(&status.requested, size);
            toku_sync_add_and_fetch(&status.used, used);
            toku_sync_add_and_fetch(&status.freed, used_orig);
            set_max(status.used, status.freed);
        }
    } else {
        toku_sync_add_and_fetch(&status.realloc_fail, 1);
        status.last_failed_size = size;
    }
    return q;
}

void *toku_realloc_aligned(size_t alignment, void *p, size_t size) {
#if __APPLE__
    if (size == 0) {
        if (p != nullptr) {
            toku_free(p);
        }
        return nullptr;
    }
#endif

    if (size > status.max_requested_size) {
        status.max_requested_size = size;
    }
    size_t used_orig = p ? my_malloc_usable_size(p) : 0;
    void *q = t_realloc_aligned ? t_realloc_aligned(alignment, p, size) : os_realloc_aligned(alignment, p, size);
    if (q) {
        if (toku_memory_do_stats) {
            size_t used = my_malloc_usable_size(q);
            toku_sync_add_and_fetch(&status.realloc_count, 1);
            toku_sync_add_and_fetch(&status.requested, size);
            toku_sync_add_and_fetch(&status.used, used);
            toku_sync_add_and_fetch(&status.freed, used_orig);
            set_max(status.used, status.freed);
        }
    } else {
        toku_sync_add_and_fetch(&status.realloc_fail, 1);
        status.last_failed_size = size;
    }
    return q;
}


void *
toku_memdup(const void *v, size_t len) {
    void *p = toku_malloc(len);
    if (p) memcpy(p, v,len);
    return p;
}

char *
toku_strdup(const char *s) {
    return (char *) toku_memdup(s, strlen(s)+1);
}

char *toku_strndup(const char *s, size_t n) {
    size_t s_size = strlen(s);
    size_t bytes_to_copy = n > s_size ? s_size : n;
    ++bytes_to_copy;
    char *result = (char *)toku_memdup(s, bytes_to_copy);
    result[bytes_to_copy - 1] = 0;
    return result;
}

void
toku_free(void *p) {
    if (p) {
        if (toku_memory_do_stats) {
            size_t used = my_malloc_usable_size(p);
            toku_sync_add_and_fetch(&status.free_count, 1);
            toku_sync_add_and_fetch(&status.freed, used);
        }
        if (t_free)
            t_free(p);
        else
            os_free(p);
    }
}

void *
toku_xmalloc(size_t size) {
#if __APPLE__
    if (size == 0) {
        return nullptr;
    }
#endif

    if (size > status.max_requested_size) {
        status.max_requested_size = size;
    }
    void *p = t_xmalloc ? t_xmalloc(size) : os_malloc(size);
    if (p == NULL) {  // avoid function call in common case
        status.last_failed_size = size;
        resource_assert(p);
    }
    TOKU_ANNOTATE_NEW_MEMORY(p, size); // see #4671 and https://bugs.kde.org/show_bug.cgi?id=297147
    if (toku_memory_do_stats) {
        size_t used = my_malloc_usable_size(p);
        toku_sync_add_and_fetch(&status.malloc_count, 1);
        toku_sync_add_and_fetch(&status.requested, size);
        toku_sync_add_and_fetch(&status.used, used);
        set_max(status.used, status.freed);
    }
    return p;
}

void* toku_xmalloc_aligned(size_t alignment, size_t size)
// Effect: Perform a malloc(size) with the additional property that the returned pointer is a multiple of ALIGNMENT.
//  Fail with a resource_assert if the allocation fails (don't return an error code).
// Requires: alignment is a power of two.
{
#if __APPLE__
    if (size == 0) {
        return nullptr;
    }
#endif

    if (size > status.max_requested_size) {
        status.max_requested_size = size;
    }
    void *p = t_xmalloc_aligned ? t_xmalloc_aligned(alignment, size) : os_malloc_aligned(alignment,size);
    if (p == NULL && size != 0) {
        status.last_failed_size = size;
        resource_assert(p);
    }
    if (toku_memory_do_stats) {
        size_t used = my_malloc_usable_size(p);
        toku_sync_add_and_fetch(&status.malloc_count, 1);
        toku_sync_add_and_fetch(&status.requested, size);
        toku_sync_add_and_fetch(&status.used, used);
        set_max(status.used, status.freed);
    }
    return p;
}

void *
toku_xcalloc(size_t nmemb, size_t size) {
    size_t newsize = nmemb * size;
    void *vp = toku_xmalloc(newsize);
    if (vp) memset(vp, 0, newsize);
    return vp;
}

void *
toku_xrealloc(void *v, size_t size) {
#if __APPLE__
    if (size == 0) {
        if (v != nullptr) {
            toku_free(v);
        }
        return nullptr;
    }
#endif

    if (size > status.max_requested_size) {
        status.max_requested_size = size;
    }
    size_t used_orig = v ? my_malloc_usable_size(v) : 0;
    void *p = t_xrealloc ? t_xrealloc(v, size) : os_realloc(v, size);
    if (p == 0) {  // avoid function call in common case
        status.last_failed_size = size;
        resource_assert(p);
    }
    if (toku_memory_do_stats) {
        size_t used = my_malloc_usable_size(p);
        toku_sync_add_and_fetch(&status.realloc_count, 1);
        toku_sync_add_and_fetch(&status.requested, size);
        toku_sync_add_and_fetch(&status.used, used);
        toku_sync_add_and_fetch(&status.freed, used_orig);
        set_max(status.used, status.freed);
    }
    return p;
}

size_t 
toku_malloc_usable_size(void *p) {
    return my_malloc_usable_size(p);
}

void *
toku_xmemdup (const void *v, size_t len) {
    void *p = toku_xmalloc(len);
    memcpy(p, v, len);
    return p;
}

char *
toku_xstrdup (const char *s) {
    return (char *) toku_xmemdup(s, strlen(s)+1);
}

void
toku_set_func_malloc(malloc_fun_t f) {
    t_malloc = f;
    t_xmalloc = f;
}

void
toku_set_func_xmalloc_only(malloc_fun_t f) {
    t_xmalloc = f;
}

void
toku_set_func_malloc_only(malloc_fun_t f) {
    t_malloc = f;
}

void
toku_set_func_realloc(realloc_fun_t f) {
    t_realloc = f;
    t_xrealloc = f;
}

void
toku_set_func_xrealloc_only(realloc_fun_t f) {
    t_xrealloc = f;
}

void
toku_set_func_realloc_only(realloc_fun_t f) {
    t_realloc = f;

}

void
toku_set_func_free(free_fun_t f) {
    t_free = f;
}

#include <toku_race_tools.h>
void __attribute__((constructor)) toku_memory_helgrind_ignore(void);
void
toku_memory_helgrind_ignore(void) {
    TOKU_VALGRIND_HG_DISABLE_CHECKING(&status, sizeof status);
}