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annotate nspr/lib/ds/plarena.h @ 2:a945361df361

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Fix NSS_LIBRARIES variable
author Andre Heinecke <andre.heinecke@intevation.de>
date Wed, 30 Jul 2014 16:20:44 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6 #ifndef plarena_h___
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7 #define plarena_h___
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8 /*
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9 * Lifetime-based fast allocation, inspired by much prior art, including
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10 * "Fast Allocation and Deallocation of Memory Based on Object Lifetimes"
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11 * David R. Hanson, Software -- Practice and Experience, Vol. 20(1).
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12 *
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13 * Also supports LIFO allocation (PL_ARENA_MARK/PL_ARENA_RELEASE).
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14 */
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15 #include "prtypes.h"
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16 #include "plarenas.h"
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17
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18 PR_BEGIN_EXTERN_C
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19
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20 typedef struct PLArena PLArena;
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21
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22 struct PLArena {
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23 PLArena *next; /* next arena for this lifetime */
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24 PRUword base; /* aligned base address, follows this header */
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25 PRUword limit; /* one beyond last byte in arena */
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26 PRUword avail; /* points to next available byte */
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27 };
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28
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29 #ifdef PL_ARENAMETER
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30 typedef struct PLArenaStats PLArenaStats;
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31
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32 struct PLArenaStats {
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33 PLArenaStats *next; /* next in arenaStats list */
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34 char *name; /* name for debugging */
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35 PRUint32 narenas; /* number of arenas in pool */
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36 PRUint32 nallocs; /* number of PL_ARENA_ALLOCATE() calls */
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37 PRUint32 nreclaims; /* number of reclaims from freeArenas */
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38 PRUint32 nmallocs; /* number of malloc() calls */
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39 PRUint32 ndeallocs; /* number of lifetime deallocations */
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40 PRUint32 ngrows; /* number of PL_ARENA_GROW() calls */
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41 PRUint32 ninplace; /* number of in-place growths */
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42 PRUint32 nreleases; /* number of PL_ARENA_RELEASE() calls */
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43 PRUint32 nfastrels; /* number of "fast path" releases */
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44 PRUint32 nbytes; /* total bytes allocated */
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45 PRUint32 maxalloc; /* maximum allocation size in bytes */
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46 PRFloat64 variance; /* size variance accumulator */
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47 };
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48 #endif
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49
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50 struct PLArenaPool {
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51 PLArena first; /* first arena in pool list */
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52 PLArena *current; /* arena from which to allocate space */
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53 PRUint32 arenasize; /* net exact size of a new arena */
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54 PRUword mask; /* alignment mask (power-of-2 - 1) */
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55 #ifdef PL_ARENAMETER
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56 PLArenaStats stats;
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57 #endif
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58 };
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59
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60 /*
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61 * WARNING: The PL_MAKE_MEM_ macros are for internal use by NSPR. Do NOT use
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62 * them in your code.
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63 *
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64 * NOTE: Valgrind support to be added.
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65 *
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66 * The PL_MAKE_MEM_ macros are modeled after the MOZ_MAKE_MEM_ macros in
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67 * Mozilla's mfbt/MemoryChecking.h. Only AddressSanitizer is supported now.
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68 *
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69 * Provides a common interface to the ASan (AddressSanitizer) and Valgrind
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70 * functions used to mark memory in certain ways. In detail, the following
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71 * three macros are provided:
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72 *
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73 * PL_MAKE_MEM_NOACCESS - Mark memory as unsafe to access (e.g. freed)
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74 * PL_MAKE_MEM_UNDEFINED - Mark memory as accessible, with content undefined
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75 * PL_MAKE_MEM_DEFINED - Mark memory as accessible, with content defined
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76 *
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77 * With Valgrind in use, these directly map to the three respective Valgrind
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78 * macros. With ASan in use, the NOACCESS macro maps to poisoning the memory,
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79 * while the UNDEFINED/DEFINED macros unpoison memory.
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80 *
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81 * With no memory checker available, all macros expand to the empty statement.
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82 */
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83
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84 /* WARNING: PL_SANITIZE_ADDRESS is for internal use by this header. Do NOT
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85 * define or test this macro in your code.
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86 */
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87 #if defined(__has_feature)
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88 #if __has_feature(address_sanitizer)
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89 #define PL_SANITIZE_ADDRESS 1
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90 #endif
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91 #elif defined(__SANITIZE_ADDRESS__)
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92 #define PL_SANITIZE_ADDRESS 1
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93 #endif
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94
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95 #if defined(PL_SANITIZE_ADDRESS)
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96
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97 /* These definitions are usually provided through the
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98 * sanitizer/asan_interface.h header installed by ASan.
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99 * See https://code.google.com/p/address-sanitizer/wiki/ManualPoisoning
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100 */
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101
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102 void __asan_poison_memory_region(void const volatile *addr, size_t size);
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103 void __asan_unpoison_memory_region(void const volatile *addr, size_t size);
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104
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105 #define PL_MAKE_MEM_NOACCESS(addr, size) \
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106 __asan_poison_memory_region((addr), (size))
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107
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108 #define PL_MAKE_MEM_UNDEFINED(addr, size) \
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109 __asan_unpoison_memory_region((addr), (size))
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110
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111 #define PL_MAKE_MEM_DEFINED(addr, size) \
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112 __asan_unpoison_memory_region((addr), (size))
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113
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114 #else
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115
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116 #define PL_MAKE_MEM_NOACCESS(addr, size)
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117 #define PL_MAKE_MEM_UNDEFINED(addr, size)
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118 #define PL_MAKE_MEM_DEFINED(addr, size)
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119
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120 #endif
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121
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122 /*
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123 * If the including .c file uses only one power-of-2 alignment, it may define
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124 * PL_ARENA_CONST_ALIGN_MASK to the alignment mask and save a few instructions
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125 * per ALLOCATE and GROW.
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126 */
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127 #ifdef PL_ARENA_CONST_ALIGN_MASK
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128 #define PL_ARENA_ALIGN(pool, n) (((PRUword)(n) + PL_ARENA_CONST_ALIGN_MASK) \
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129 & ~PL_ARENA_CONST_ALIGN_MASK)
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130
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131 #define PL_INIT_ARENA_POOL(pool, name, size) \
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132 PL_InitArenaPool(pool, name, size, PL_ARENA_CONST_ALIGN_MASK + 1)
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133 #else
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134 #define PL_ARENA_ALIGN(pool, n) (((PRUword)(n) + (pool)->mask) & ~(pool)->mask)
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135 #endif
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136
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137 #define PL_ARENA_ALLOCATE(p, pool, nb) \
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138 PR_BEGIN_MACRO \
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139 PLArena *_a = (pool)->current; \
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140 PRUint32 _nb = PL_ARENA_ALIGN(pool, nb); \
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141 PRUword _p = _a->avail; \
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142 PRUword _q = _p + _nb; \
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143 if (_q > _a->limit) { \
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144 _p = (PRUword)PL_ArenaAllocate(pool, _nb); \
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145 } else { \
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146 _a->avail = _q; \
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147 } \
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148 p = (void *)_p; \
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149 PL_MAKE_MEM_UNDEFINED(p, nb); \
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150 PL_ArenaCountAllocation(pool, nb); \
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151 PR_END_MACRO
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152
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153 #define PL_ARENA_GROW(p, pool, size, incr) \
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154 PR_BEGIN_MACRO \
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155 PLArena *_a = (pool)->current; \
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156 PRUint32 _incr = PL_ARENA_ALIGN(pool, incr); \
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157 PRUword _p = _a->avail; \
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158 PRUword _q = _p + _incr; \
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159 if (_p == (PRUword)(p) + PL_ARENA_ALIGN(pool, size) && \
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160 _q <= _a->limit) { \
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161 PL_MAKE_MEM_UNDEFINED((unsigned char *)(p) + size, incr); \
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162 _a->avail = _q; \
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163 PL_ArenaCountInplaceGrowth(pool, size, incr); \
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164 } else { \
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165 p = PL_ArenaGrow(pool, p, size, incr); \
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166 } \
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167 PL_ArenaCountGrowth(pool, size, incr); \
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168 PR_END_MACRO
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169
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170 #define PL_ARENA_MARK(pool) ((void *) (pool)->current->avail)
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171 #define PR_UPTRDIFF(p,q) ((PRUword)(p) - (PRUword)(q))
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172
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173 #define PL_CLEAR_UNUSED_PATTERN(a, pattern) \
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174 PR_BEGIN_MACRO \
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175 PR_ASSERT((a)->avail <= (a)->limit); \
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176 PL_MAKE_MEM_UNDEFINED((void*)(a)->avail, (a)->limit - (a)->avail); \
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177 memset((void*)(a)->avail, (pattern), (a)->limit - (a)->avail); \
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178 PR_END_MACRO
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179 #ifdef DEBUG
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180 #define PL_FREE_PATTERN 0xDA
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181 #define PL_CLEAR_UNUSED(a) PL_CLEAR_UNUSED_PATTERN((a), PL_FREE_PATTERN)
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182 #define PL_CLEAR_ARENA(a) \
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183 PR_BEGIN_MACRO \
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184 PL_MAKE_MEM_UNDEFINED((void*)(a), (a)->limit - (PRUword)(a)); \
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185 memset((void*)(a), PL_FREE_PATTERN, (a)->limit - (PRUword)(a)); \
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186 PR_END_MACRO
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187 #else
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188 #define PL_CLEAR_UNUSED(a)
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189 #define PL_CLEAR_ARENA(a)
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190 #endif
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191
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192 #define PL_ARENA_RELEASE(pool, mark) \
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193 PR_BEGIN_MACRO \
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194 char *_m = (char *)(mark); \
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195 PLArena *_a = (pool)->current; \
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196 if (PR_UPTRDIFF(_m, _a->base) <= PR_UPTRDIFF(_a->avail, _a->base)) { \
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197 _a->avail = (PRUword)PL_ARENA_ALIGN(pool, _m); \
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198 PL_CLEAR_UNUSED(_a); \
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199 PL_MAKE_MEM_NOACCESS((void*)_a->avail, _a->limit - _a->avail); \
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200 PL_ArenaCountRetract(pool, _m); \
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201 } else { \
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202 PL_ArenaRelease(pool, _m); \
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203 } \
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204 PL_ArenaCountRelease(pool, _m); \
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205 PR_END_MACRO
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206
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207 #ifdef PL_ARENAMETER
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208 #define PL_COUNT_ARENA(pool,op) ((pool)->stats.narenas op)
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209 #else
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210 #define PL_COUNT_ARENA(pool,op)
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211 #endif
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212
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213 #define PL_ARENA_DESTROY(pool, a, pnext) \
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214 PR_BEGIN_MACRO \
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215 PL_COUNT_ARENA(pool,--); \
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216 if ((pool)->current == (a)) (pool)->current = &(pool)->first; \
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217 *(pnext) = (a)->next; \
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218 PL_CLEAR_ARENA(a); \
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219 free(a); \
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220 (a) = 0; \
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221 PR_END_MACRO
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222
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223 #ifdef PL_ARENAMETER
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224
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225 #include <stdio.h>
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226
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227 PR_EXTERN(void) PL_ArenaCountAllocation(PLArenaPool *pool, PRUint32 nb);
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228
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229 PR_EXTERN(void) PL_ArenaCountInplaceGrowth(
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230 PLArenaPool *pool, PRUint32 size, PRUint32 incr);
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231
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232 PR_EXTERN(void) PL_ArenaCountGrowth(
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233 PLArenaPool *pool, PRUint32 size, PRUint32 incr);
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234
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235 PR_EXTERN(void) PL_ArenaCountRelease(PLArenaPool *pool, char *mark);
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236
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237 PR_EXTERN(void) PL_ArenaCountRetract(PLArenaPool *pool, char *mark);
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238
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239 PR_EXTERN(void) PL_DumpArenaStats(FILE *fp);
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240
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241 #else /* !PL_ARENAMETER */
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242
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243 #define PL_ArenaCountAllocation(ap, nb) /* nothing */
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244 #define PL_ArenaCountInplaceGrowth(ap, size, incr) /* nothing */
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245 #define PL_ArenaCountGrowth(ap, size, incr) /* nothing */
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246 #define PL_ArenaCountRelease(ap, mark) /* nothing */
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247 #define PL_ArenaCountRetract(ap, mark) /* nothing */
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248
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249 #endif /* !PL_ARENAMETER */
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250
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251 PR_END_EXTERN_C
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252
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253 #endif /* plarena_h___ */
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