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comparison nspr/lib/ds/plarena.h @ 0:1e5118fa0cb1

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This is NSS with a Cmake Buildsyste To compile a static NSS library for Windows we've used the Chromium-NSS fork and added a Cmake buildsystem to compile it statically for Windows. See README.chromium for chromium changes and README.trustbridge for our modifications.
author Andre Heinecke <andre.heinecke@intevation.de>
date Mon, 28 Jul 2014 10:47:06 +0200
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 #ifndef plarena_h___
7 #define plarena_h___
8 /*
9 * Lifetime-based fast allocation, inspired by much prior art, including
10 * "Fast Allocation and Deallocation of Memory Based on Object Lifetimes"
11 * David R. Hanson, Software -- Practice and Experience, Vol. 20(1).
12 *
13 * Also supports LIFO allocation (PL_ARENA_MARK/PL_ARENA_RELEASE).
14 */
15 #include "prtypes.h"
16 #include "plarenas.h"
17
18 PR_BEGIN_EXTERN_C
19
20 typedef struct PLArena PLArena;
21
22 struct PLArena {
23 PLArena *next; /* next arena for this lifetime */
24 PRUword base; /* aligned base address, follows this header */
25 PRUword limit; /* one beyond last byte in arena */
26 PRUword avail; /* points to next available byte */
27 };
28
29 #ifdef PL_ARENAMETER
30 typedef struct PLArenaStats PLArenaStats;
31
32 struct PLArenaStats {
33 PLArenaStats *next; /* next in arenaStats list */
34 char *name; /* name for debugging */
35 PRUint32 narenas; /* number of arenas in pool */
36 PRUint32 nallocs; /* number of PL_ARENA_ALLOCATE() calls */
37 PRUint32 nreclaims; /* number of reclaims from freeArenas */
38 PRUint32 nmallocs; /* number of malloc() calls */
39 PRUint32 ndeallocs; /* number of lifetime deallocations */
40 PRUint32 ngrows; /* number of PL_ARENA_GROW() calls */
41 PRUint32 ninplace; /* number of in-place growths */
42 PRUint32 nreleases; /* number of PL_ARENA_RELEASE() calls */
43 PRUint32 nfastrels; /* number of "fast path" releases */
44 PRUint32 nbytes; /* total bytes allocated */
45 PRUint32 maxalloc; /* maximum allocation size in bytes */
46 PRFloat64 variance; /* size variance accumulator */
47 };
48 #endif
49
50 struct PLArenaPool {
51 PLArena first; /* first arena in pool list */
52 PLArena *current; /* arena from which to allocate space */
53 PRUint32 arenasize; /* net exact size of a new arena */
54 PRUword mask; /* alignment mask (power-of-2 - 1) */
55 #ifdef PL_ARENAMETER
56 PLArenaStats stats;
57 #endif
58 };
59
60 /*
61 * WARNING: The PL_MAKE_MEM_ macros are for internal use by NSPR. Do NOT use
62 * them in your code.
63 *
64 * NOTE: Valgrind support to be added.
65 *
66 * The PL_MAKE_MEM_ macros are modeled after the MOZ_MAKE_MEM_ macros in
67 * Mozilla's mfbt/MemoryChecking.h. Only AddressSanitizer is supported now.
68 *
69 * Provides a common interface to the ASan (AddressSanitizer) and Valgrind
70 * functions used to mark memory in certain ways. In detail, the following
71 * three macros are provided:
72 *
73 * PL_MAKE_MEM_NOACCESS - Mark memory as unsafe to access (e.g. freed)
74 * PL_MAKE_MEM_UNDEFINED - Mark memory as accessible, with content undefined
75 * PL_MAKE_MEM_DEFINED - Mark memory as accessible, with content defined
76 *
77 * With Valgrind in use, these directly map to the three respective Valgrind
78 * macros. With ASan in use, the NOACCESS macro maps to poisoning the memory,
79 * while the UNDEFINED/DEFINED macros unpoison memory.
80 *
81 * With no memory checker available, all macros expand to the empty statement.
82 */
83
84 /* WARNING: PL_SANITIZE_ADDRESS is for internal use by this header. Do NOT
85 * define or test this macro in your code.
86 */
87 #if defined(__has_feature)
88 #if __has_feature(address_sanitizer)
89 #define PL_SANITIZE_ADDRESS 1
90 #endif
91 #elif defined(__SANITIZE_ADDRESS__)
92 #define PL_SANITIZE_ADDRESS 1
93 #endif
94
95 #if defined(PL_SANITIZE_ADDRESS)
96
97 /* These definitions are usually provided through the
98 * sanitizer/asan_interface.h header installed by ASan.
99 * See https://code.google.com/p/address-sanitizer/wiki/ManualPoisoning
100 */
101
102 void __asan_poison_memory_region(void const volatile *addr, size_t size);
103 void __asan_unpoison_memory_region(void const volatile *addr, size_t size);
104
105 #define PL_MAKE_MEM_NOACCESS(addr, size) \
106 __asan_poison_memory_region((addr), (size))
107
108 #define PL_MAKE_MEM_UNDEFINED(addr, size) \
109 __asan_unpoison_memory_region((addr), (size))
110
111 #define PL_MAKE_MEM_DEFINED(addr, size) \
112 __asan_unpoison_memory_region((addr), (size))
113
114 #else
115
116 #define PL_MAKE_MEM_NOACCESS(addr, size)
117 #define PL_MAKE_MEM_UNDEFINED(addr, size)
118 #define PL_MAKE_MEM_DEFINED(addr, size)
119
120 #endif
121
122 /*
123 * If the including .c file uses only one power-of-2 alignment, it may define
124 * PL_ARENA_CONST_ALIGN_MASK to the alignment mask and save a few instructions
125 * per ALLOCATE and GROW.
126 */
127 #ifdef PL_ARENA_CONST_ALIGN_MASK
128 #define PL_ARENA_ALIGN(pool, n) (((PRUword)(n) + PL_ARENA_CONST_ALIGN_MASK) \
129 & ~PL_ARENA_CONST_ALIGN_MASK)
130
131 #define PL_INIT_ARENA_POOL(pool, name, size) \
132 PL_InitArenaPool(pool, name, size, PL_ARENA_CONST_ALIGN_MASK + 1)
133 #else
134 #define PL_ARENA_ALIGN(pool, n) (((PRUword)(n) + (pool)->mask) & ~(pool)->mask)
135 #endif
136
137 #define PL_ARENA_ALLOCATE(p, pool, nb) \
138 PR_BEGIN_MACRO \
139 PLArena *_a = (pool)->current; \
140 PRUint32 _nb = PL_ARENA_ALIGN(pool, nb); \
141 PRUword _p = _a->avail; \
142 PRUword _q = _p + _nb; \
143 if (_q > _a->limit) { \
144 _p = (PRUword)PL_ArenaAllocate(pool, _nb); \
145 } else { \
146 _a->avail = _q; \
147 } \
148 p = (void *)_p; \
149 PL_MAKE_MEM_UNDEFINED(p, nb); \
150 PL_ArenaCountAllocation(pool, nb); \
151 PR_END_MACRO
152
153 #define PL_ARENA_GROW(p, pool, size, incr) \
154 PR_BEGIN_MACRO \
155 PLArena *_a = (pool)->current; \
156 PRUint32 _incr = PL_ARENA_ALIGN(pool, incr); \
157 PRUword _p = _a->avail; \
158 PRUword _q = _p + _incr; \
159 if (_p == (PRUword)(p) + PL_ARENA_ALIGN(pool, size) && \
160 _q <= _a->limit) { \
161 PL_MAKE_MEM_UNDEFINED((unsigned char *)(p) + size, incr); \
162 _a->avail = _q; \
163 PL_ArenaCountInplaceGrowth(pool, size, incr); \
164 } else { \
165 p = PL_ArenaGrow(pool, p, size, incr); \
166 } \
167 PL_ArenaCountGrowth(pool, size, incr); \
168 PR_END_MACRO
169
170 #define PL_ARENA_MARK(pool) ((void *) (pool)->current->avail)
171 #define PR_UPTRDIFF(p,q) ((PRUword)(p) - (PRUword)(q))
172
173 #define PL_CLEAR_UNUSED_PATTERN(a, pattern) \
174 PR_BEGIN_MACRO \
175 PR_ASSERT((a)->avail <= (a)->limit); \
176 PL_MAKE_MEM_UNDEFINED((void*)(a)->avail, (a)->limit - (a)->avail); \
177 memset((void*)(a)->avail, (pattern), (a)->limit - (a)->avail); \
178 PR_END_MACRO
179 #ifdef DEBUG
180 #define PL_FREE_PATTERN 0xDA
181 #define PL_CLEAR_UNUSED(a) PL_CLEAR_UNUSED_PATTERN((a), PL_FREE_PATTERN)
182 #define PL_CLEAR_ARENA(a) \
183 PR_BEGIN_MACRO \
184 PL_MAKE_MEM_UNDEFINED((void*)(a), (a)->limit - (PRUword)(a)); \
185 memset((void*)(a), PL_FREE_PATTERN, (a)->limit - (PRUword)(a)); \
186 PR_END_MACRO
187 #else
188 #define PL_CLEAR_UNUSED(a)
189 #define PL_CLEAR_ARENA(a)
190 #endif
191
192 #define PL_ARENA_RELEASE(pool, mark) \
193 PR_BEGIN_MACRO \
194 char *_m = (char *)(mark); \
195 PLArena *_a = (pool)->current; \
196 if (PR_UPTRDIFF(_m, _a->base) <= PR_UPTRDIFF(_a->avail, _a->base)) { \
197 _a->avail = (PRUword)PL_ARENA_ALIGN(pool, _m); \
198 PL_CLEAR_UNUSED(_a); \
199 PL_MAKE_MEM_NOACCESS((void*)_a->avail, _a->limit - _a->avail); \
200 PL_ArenaCountRetract(pool, _m); \
201 } else { \
202 PL_ArenaRelease(pool, _m); \
203 } \
204 PL_ArenaCountRelease(pool, _m); \
205 PR_END_MACRO
206
207 #ifdef PL_ARENAMETER
208 #define PL_COUNT_ARENA(pool,op) ((pool)->stats.narenas op)
209 #else
210 #define PL_COUNT_ARENA(pool,op)
211 #endif
212
213 #define PL_ARENA_DESTROY(pool, a, pnext) \
214 PR_BEGIN_MACRO \
215 PL_COUNT_ARENA(pool,--); \
216 if ((pool)->current == (a)) (pool)->current = &(pool)->first; \
217 *(pnext) = (a)->next; \
218 PL_CLEAR_ARENA(a); \
219 free(a); \
220 (a) = 0; \
221 PR_END_MACRO
222
223 #ifdef PL_ARENAMETER
224
225 #include <stdio.h>
226
227 PR_EXTERN(void) PL_ArenaCountAllocation(PLArenaPool *pool, PRUint32 nb);
228
229 PR_EXTERN(void) PL_ArenaCountInplaceGrowth(
230 PLArenaPool *pool, PRUint32 size, PRUint32 incr);
231
232 PR_EXTERN(void) PL_ArenaCountGrowth(
233 PLArenaPool *pool, PRUint32 size, PRUint32 incr);
234
235 PR_EXTERN(void) PL_ArenaCountRelease(PLArenaPool *pool, char *mark);
236
237 PR_EXTERN(void) PL_ArenaCountRetract(PLArenaPool *pool, char *mark);
238
239 PR_EXTERN(void) PL_DumpArenaStats(FILE *fp);
240
241 #else /* !PL_ARENAMETER */
242
243 #define PL_ArenaCountAllocation(ap, nb) /* nothing */
244 #define PL_ArenaCountInplaceGrowth(ap, size, incr) /* nothing */
245 #define PL_ArenaCountGrowth(ap, size, incr) /* nothing */
246 #define PL_ArenaCountRelease(ap, mark) /* nothing */
247 #define PL_ArenaCountRetract(ap, mark) /* nothing */
248
249 #endif /* !PL_ARENAMETER */
250
251 PR_END_EXTERN_C
252
253 #endif /* plarena_h___ */
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