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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 /*--- prototypes -------------------------------------------------------*/
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27
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28 BEGIN_C_DECLS
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29
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3305
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30 /* Set to 1 if memory becomes short. */
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31 extern EMACS_INT memory_shortage;
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32
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33
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3092
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34 /* Internal Allocator Functions: */
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35
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3092
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36 /* Initialize the allocator. This has to be called prior to
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37 requesting memory. */
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2720
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38 void init_mc_allocator (void);
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39
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3092
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40 /* Allocate a block of memory of given size and return the pointer to
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41 it. */
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42 void *mc_alloc (size_t size);
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43
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3092
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44 /* Allocate a block of memory as an array with elemcount elements of
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45 given size and return the pointer to it. Arrays contain several
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46 objects that are allocated in one consecutive block of memory with
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47 each element being a fully qualified object---that is, it has a
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48 Lisp object header and a mark bit. Objects like hash tables and
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49 dynamic arrays use this function. */
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50 void *mc_alloc_array (size_t size, EMACS_INT elemcount);
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51
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52 /* Modify the size of the memory block pointed to by ptr. Return the
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53 address of the new block of given size. The content of the memory
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54 block will be unchanged to the minimum of the old and new sizes: if
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55 the new size is smaller, the overlaying data is cut off; if the new
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56 size is bigger, the newly allocated memory will be uninitialized.*/
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57 void *mc_realloc (void *ptr, size_t size);
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58
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59 /* Modify the size of the array pointed to by ptr. Return the address
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60 of the new array block with elemcount elements of given size. The
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61 content of the memory block will be unchanged to the minimum of the
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62 old and new sizes: if the new size is smaller, the overlaying data
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63 is cut off; if the new size is bigger, the newly allocated memory
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64 will be uninitialized.*/
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65 void *mc_realloc_array (void *ptr, size_t size, EMACS_INT elemcount);
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66
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67
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68
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69 /* Garbage collection related functions and macros: */
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70
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3092
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71 enum mark_bit_colors
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72 {
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73 WHITE = 0,
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74 BLACK = 1,
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75 GREY = 2
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76 };
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77
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78 /* Set the mark bit of the object pointed to by ptr to value.*/
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79 void set_mark_bit (void *ptr, EMACS_INT value);
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80
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81 /* Return the mark bit of the object pointed to by ptr. */
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82 EMACS_INT get_mark_bit (void *ptr);
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83
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84 /* mark bit macros */
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85 /* Returns true if the mark bit of the object pointed to by ptr is set. */
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86 #define MARKED_P(ptr) (get_mark_bit (ptr) != WHITE)
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87
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88 /* Marks the object pointed to by ptr (sets the mark bit to 1). */
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89 #define MARK(ptr) set_mark_bit (ptr, BLACK)
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90
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91 /* Unmarks the object pointed to by ptr (sets the mark bit to 0). */
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92 #define UNMARK(ptr) set_mark_bit (ptr, WHITE)
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93
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94 #define MARK_WHITE(ptr) set_mark_bit (ptr, WHITE)
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95 #define MARK_GREY(ptr) set_mark_bit (ptr, GREY)
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96 #define MARK_BLACK(ptr) set_mark_bit (ptr, BLACK)
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97
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98 #define MARKED_WHITE_P(ptr) (get_mark_bit (ptr) == WHITE)
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99 #define MARKED_GREY_P(ptr) (get_mark_bit (ptr) == GREY)
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100 #define MARKED_BLACK_P(ptr) (get_mark_bit (ptr) == BLACK)
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101
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102 /* The finalizer of every not marked object is called. The macro
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103 MC_ALLOC_CALL_FINALIZER has to be defined and call the finalizer of
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104 the object. Returns number of processed pages. */
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105 EMACS_INT mc_finalize (void);
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106
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3303
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107 /* All not marked objects of the used heap are freed. Returns number
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108 of processed pages. */
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109 EMACS_INT mc_sweep (void);
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110
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111
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112
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113 /* Portable dumper related functions and macros: */
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114
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115 /* The finalizer for disksave of every object is called to shrink the
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116 dump image. The macro MC_ALLOC_CALL_FINALIZER_FOR_DISKSAVE has to
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117 be defined and call the finalizer for disksave of the object.
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118 Returns number of processed pages. */
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119 EMACS_INT mc_finalize_for_disksave (void);
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120
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121
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122
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123 /* Functions and macros related with allocation statistics: */
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124
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125 #ifdef MEMORY_USAGE_STATS
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126 /* Returns the real size, including overhead, which is actually alloced
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127 for an object with given claimed_size. */
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128 Bytecount mc_alloced_storage_size (Bytecount claimed_size,
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129 struct overhead_stats *stats);
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130 #endif /* MEMORY_USAGE_STATS */
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131
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132
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133 /* Incremental Garbage Collector / Write Barrier Support: */
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134
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135 /* Return the PAGESIZE the allocator uses. Generally equals to the
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136 system's PAGESIZE. */
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137 EMACS_INT mc_get_page_size (void);
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138
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139 /* Is the fault at ptr on a protected page? */
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140 EMACS_INT fault_on_protected_page (void *ptr);
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141
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3303
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142 /* Remove protection (if there) of heap page of given page header ph.
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143 Returns number of processed pages. */
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144 EMACS_INT protect_heap_pages (void);
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145
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3303
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146 /* Remove protection for all heap pages which are protected. Returns
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147 number of processed pages. */
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148 EMACS_INT unprotect_heap_pages (void);
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149
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150 /* Remove protection and mark page dirty. */
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151 void unprotect_page_and_mark_dirty (void *ptr);
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152
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153 /* Repush all objects on dirty pages onto the mark stack. Return
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154 number of repushed objects. */
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155 int repush_all_objects_on_page (void *ptr);
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156
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157 /* Mark black if object is currently grey. */
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158 EMACS_INT maybe_mark_black (void *ptr);
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159
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160 /* Only for debugging---not used anywhere in the sources. */
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161 EMACS_INT object_on_heap_p (void *ptr);
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162
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163 END_C_DECLS
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164
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165 #endif /* INCLUDED_mc_alloc_h_ */
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