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2720
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1 /* New allocator for XEmacs.
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2 Copyright (C) 2005 Marcus Crestani.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: Not in FSF. */
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22
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23 #ifndef INCLUDED_mc_alloc_h_
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24 #define INCLUDED_mc_alloc_h_
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25
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26
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27 /* This is moved here from alloc.c. */
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28 #ifndef MALLOC_OVERHEAD
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29 # ifdef GNU_MALLOC
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30 # define MALLOC_OVERHEAD 0
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31 # elif defined (rcheck)
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32 # define MALLOC_OVERHEAD 20
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33 # else
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34 # define MALLOC_OVERHEAD 8
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35 # endif
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36 #endif /* MALLOC_OVERHEAD */
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37
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38 /*--- prototypes -------------------------------------------------------*/
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39
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40 BEGIN_C_DECLS
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41
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42
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43
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44 /* Allocation related functions and macros: */
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45
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46 /* Builds and initializes all needed datastructures of the new allocator. */
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47 void init_mc_allocator (void);
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48
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49 /* Returns a pointer to a block of memory of given size on the used heap. */
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50 void *mc_alloc (size_t size);
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51
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52 /* Frees the object pointed to by pointer. */
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53 void mc_free (void *ptr);
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54
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55 /* Modifies the size of the memory block pointed to by ptr. The
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56 Address of the new block of given size is returned. */
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57 void *mc_realloc (void *ptr, size_t size);
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58
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59
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60
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61 /* Garbage collection related functions and macros: */
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62
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63 /* Set the mark bit of the object pointed to by ptr to value.*/
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64 void set_mark_bit (void *ptr, EMACS_INT value);
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65
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66 /* Return the mark bit of the object pointed to by ptr. */
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67 EMACS_INT get_mark_bit (void *ptr);
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68
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69 /* mark bit macros */
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70 /* Returns true if the mark bit of the object pointed to by ptr is set. */
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71 #define MARKED_P(ptr) (get_mark_bit (ptr) == 1)
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72
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73 /* Marks the object pointed to by ptr (sets the mark bit to 1). */
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74 #define MARK(ptr) set_mark_bit (ptr, 1)
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75
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76 /* Unmarks the object pointed to by ptr (sets the mark bit to 0). */
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77 #define UNMARK(ptr) set_mark_bit (ptr, 0)
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78
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79 /* The finalizer of every not marked object is called. The macro
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80 MC_ALLOC_CALL_FINALIZER has to be defined and call the finalizer of
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81 the object. */
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82 void mc_finalize (void);
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83
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84 /* All not marked objects of the used heap are freed. */
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85 void mc_sweep (void);
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86
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87
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88
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89 /* Portable dumper related functions and macros: */
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90
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91 /* The finalizer for disksave of every object is called to shrink the
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92 dump image. The macro MC_ALLOC_CALL_FINALIZER_FOR_DISKSAVE has to
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93 be defined and call the finalizer for disksave of the object. */
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94 void mc_finalize_for_disksave (void);
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95
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96
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97
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98 /* Allocation function for the unmanaged heap: */
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99
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100 /* Returns a pointer to a block of memory of given size on the
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101 unmanaged heap. */
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102 void *mc_alloc_unmanaged (size_t size);
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103
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104 /* Modifies the size of the memory block pointed to by ptr. The
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105 Address of the new block of given size is returned. */
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106 void *mc_realloc_unmanaged (void *ptr, size_t size);
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107
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108
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109
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110 /* Functions and macros related with allocation statistics: */
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111
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112 #ifdef MEMORY_USAGE_STATS
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113 /* Returns the real size, including overhead, which is actually alloced
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114 for an object with given claimed_size. */
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115 Bytecount mc_alloced_storage_size (Bytecount claimed_size,
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116 struct overhead_stats *stats);
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117 #endif /* MEMORY_USAGE_STATS */
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118
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119 END_C_DECLS
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120
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121 #endif /* INCLUDED_mc_alloc_h_ */
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