tlsf_rtt.c

#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>

#include "tlsf.h"
#include "tlsf_rtt.h"

#define RTL_TLSF_DEBUG      1

#define DEBUG_TLSF_ALLOC    (1<<0)
#define DEBUG_TLSF_FREE     (1<<1)
#define DEBUG_TLSF_TRACE    (1<<20)

#ifdef RTL_TLSF_DEBUG
# define _DBG(x, mask, fmt, args...) do{ if (mask & x) printf("%s: " fmt "\n", __FUNCTION__, ##args); } while(0);
#else
# define _DBG(x, mask, fmt, args...) do { } while(0);
#endif

#define TLSF_POOL_MIN_SIZE  1*1014*1024

/* create a memory pool of sz and initialize it for use with TLSF */
int tlsf_rtt_init_mp(struct lua_tlsf_info *tlsf_inf, size_t sz)
{
    tlsf_inf->L = NULL;
    tlsf_inf->mask = 0;
    tlsf_inf->pool2 = NULL;
    tlsf_inf->total_mem = 0;

    if(sz < TLSF_POOL_MIN_SIZE) {
        fprintf(stderr, "error: requested tlsf pool size (0x%lx) too small\n", (unsigned long) sz);
        goto fail;
    }

    tlsf_inf->pool = malloc(sz);

    if(!tlsf_inf->pool) {
        fprintf(stderr, "error failed to allocate: 0x%lx bytes\n", (unsigned long) sz);
        goto fail;
    }

    tlsf_inf->total_mem = rtl_init_memory_pool(sz, tlsf_inf->pool);
    return 0;
 fail:
    return -1;
}

/* cleanup mempool */
void tlsf_rtt_free_mp(struct lua_tlsf_info *tlsf_inf)
{
     rtl_destroy_memory_pool(tlsf_inf->pool);
     free(tlsf_inf->pool);

     if(tlsf_inf->pool2)
         free(tlsf_inf->pool2);
}

/* this hook will print a backtrace and reset itself */
static void tlsf_trace_hook(lua_State *L, lua_Debug *ar)
{
    (void)ar;
    lua_sethook(L, tlsf_trace_hook, 0, 0);
    luaL_error(L, "memory allocation in TLSF trace mode");
}

/* tlsf based Lua allocator */
void* tlsf_alloc (void *ud, void *ptr, size_t osize, size_t nsize)
{
    (void)osize;
    struct lua_tlsf_info *tlsf_inf = (struct lua_tlsf_info*) ud;

    if (nsize == 0) {
        _DBG(DEBUG_TLSF_FREE, tlsf_inf->mask, "freeing 0x%lx, osize=%lu, nsize=%lu",
             (unsigned long) ptr, (unsigned long) osize, (unsigned long) nsize);
        rtl_free_ex(ptr, tlsf_inf->pool);
        return NULL;
    } else {
        if(DEBUG_TLSF_TRACE & tlsf_inf->mask) {
            lua_sethook(tlsf_inf->L, tlsf_trace_hook, LUA_MASKCALL | LUA_MASKRET | LUA_MASKLINE | LUA_MASKCOUNT, 1);
        }
        _DBG(DEBUG_TLSF_ALLOC, tlsf_inf->mask, "allocating 0x%lx, osize=%lu, nsize=%lu",
             (unsigned long) ptr, (unsigned long) osize, (unsigned long) nsize);
        return rtl_realloc_ex(ptr, nsize, tlsf_inf->pool);
    }
}

int tlsf_rtt_incmem(struct lua_tlsf_info *tlsf_inf, size_t sz)
{
    if(tlsf_inf->pool2 != NULL)
        luaL_error(tlsf_inf->L, "tlsf_rtt_incmem: region already increased, (increasing cur. only possible once)");

    if((tlsf_inf->pool2 = malloc(sz)) == NULL)
        luaL_error(tlsf_inf->L, "tlsf_rtt_incmem: failed to increase memory by %d bytes. Out of mem.");

    tlsf_inf->total_mem += rtl_add_new_area(tlsf_inf->pool2, sz, tlsf_inf->pool);

    return 0;
}

/* store and retrieve the tlsf_info in the registry
 * this is required for the enabling and disabling
 * trace functions
 */
void set_context_tlsf_info(struct lua_tlsf_info* tlsf_inf)
{
    lua_pushstring(tlsf_inf->L, "tlsf_info");
    lua_pushlightuserdata(tlsf_inf->L, tlsf_inf);
    lua_rawset(tlsf_inf->L, LUA_REGISTRYINDEX);
}

struct lua_tlsf_info* get_context_tlsf_info(lua_State *L)
{
    lua_pushstring(L, "tlsf_info");
    lua_rawget(L, LUA_REGISTRYINDEX);
    return (struct lua_tlsf_info*) lua_touserdata(L, -1);
}

static int tlsf_trace(lua_State *L)
{
    int argc, enable, ret;
    struct lua_tlsf_info *tlsf_inf = get_context_tlsf_info(L);
    ret = 0;
    argc = lua_gettop(L);

    if(argc == 0) {
        lua_pushboolean(L, tlsf_inf->mask & DEBUG_TLSF_TRACE);
        ret = 1;
        goto out;
    }

    enable = lua_toboolean(L, 1);

    if(enable) {
        tlsf_inf->mask |= DEBUG_TLSF_TRACE;
    } else {
        lua_sethook(L, tlsf_trace_hook, 0, 1);
        tlsf_inf->mask &= ~DEBUG_TLSF_TRACE;
    }

out:
    return ret;
}

static int tlsf_warn(lua_State *L)
{
    int argc, enable, ret;
    struct lua_tlsf_info *tlsf_inf = get_context_tlsf_info(L);
    ret = 0;
    argc = lua_gettop(L);

    if(argc == 0) {
        lua_pushboolean(L, tlsf_inf->mask & (DEBUG_TLSF_ALLOC | DEBUG_TLSF_FREE));
        ret = 1;
        goto out;
    }

    enable = lua_toboolean(L, 1);

    if(enable)
        tlsf_inf->mask |= DEBUG_TLSF_ALLOC | DEBUG_TLSF_FREE;
    else
        tlsf_inf->mask &= ~(DEBUG_TLSF_ALLOC | DEBUG_TLSF_FREE);
 out:
    return ret;
}

static int tlsf_stats(lua_State *L)
{
    struct lua_tlsf_info *tlsf_inf = get_context_tlsf_info(L);

    lua_pushinteger(L, rtl_get_used_size(tlsf_inf->pool));
    lua_pushinteger(L, rtl_get_max_size(tlsf_inf->pool));
    lua_pushinteger(L, tlsf_inf->total_mem);
    return 3;
}

static const struct luaL_Reg tlsf_f [] = {
    {"stats", tlsf_stats },
    {"warn", tlsf_warn },
    {"trace", tlsf_trace },
    {NULL, NULL}
};

void register_tlsf_api(lua_State *L)
{
    luaL_register(L, "tlsf", tlsf_f);
}