src/st-memory.h

   1 /*
   2  * st-virtual-space.h
   3  *
   4  * Copyright (C) 2008 Vincent Geddes
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23 */
  24
  25 #ifndef __ST_MEMORY__
  26 #define __ST_MEMORY__
  27
  28 #include <st-types.h>
  29 #include <st-utils.h>
  30 #include <ptr_array.h>
  31
  32 /* threshold is 8 Mb or 16 Mb depending on whether system is 32 or 64 bits */
  33 #define ST_COLLECTION_THRESHOLD (sizeof (st_oop) * 2 * 1024 * 1024)
  34
  35 #define RESERVED_SIZE        (1000 * 1024 * 1024)
  36 #define INITIAL_COMMIT_SIZE  (64 * 1024 * 1024)
  37
  38 typedef struct st_heap
  39 {
  40     st_uchar *start; /* start of reserved address space */
  41     st_uchar *p;     /* end of committed address space (`start' to `p' is thus writeable memory) */
  42     st_uchar *end;   /* end of reserved address space */
  43
  44 } st_heap;
  45
  46 typedef struct st_memory
  47 {
  48     st_heap   *heap;
  49
  50     st_oop    *start, *end;
  51     st_oop    *p;
  52
  53     st_oop    *mark_stack;
  54
  55     st_uchar  *mark_bits;
  56     st_uchar  *alloc_bits;
  57     st_uint    bits_size; /* in bytes */
  58
  59     st_oop   **offsets;
  60     st_uint    offsets_size; /* in bytes */
  61
  62     ptr_array  roots;
  63     st_uint    counter;
  64
  65     /* free context pool */
  66     st_oop     free_context_large;
  67     st_oop     free_context;
  68
  69     /* statistics */
  70     struct timespec total_pause_time;     /* total accumulated pause time */
  71     st_ulong bytes_allocated;             /* current number of allocated bytes */
  72     st_ulong bytes_collected;             /* number of bytes collected in last compaction */
  73
  74 } st_memory;
  75
  76 st_memory *st_memory_new             (void);
  77 void       st_memory_destroy         (void);
  78 void       st_memory_add_root        (st_oop object);
  79 void       st_memory_remove_root     (st_oop object);
  80 st_oop     st_memory_allocate        (st_uint size);
  81
  82 st_oop     st_memory_allocate_context (bool large);
  83 void       st_memory_recycle_context  (st_oop context);
  84
  85 st_heap  *st_heap_new       (st_uint reserved_size);
  86 bool      st_heap_grow      (st_heap *heap, st_uint grow_size);
  87 bool      st_heap_shrink    (st_heap *heap, st_uint shrink_size);
  88 void      st_heap_destroy   (st_heap *heap);
  89
  90 #endif /* __ST_MEMORY__ */