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Unified Diff: nspr/lib/ds/plarena.h

Issue 2078763002: Delete bundled copy of NSS and replace with README. (Closed) Base URL: https://chromium.googlesource.com/chromium/deps/nss@master
Patch Set: Delete bundled copy of NSS and replace with README. Created 4 years, 6 months ago
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Index: nspr/lib/ds/plarena.h
diff --git a/nspr/lib/ds/plarena.h b/nspr/lib/ds/plarena.h
deleted file mode 100644
index 2673a2ae16667a63427e9a2ea343a07720281a07..0000000000000000000000000000000000000000
--- a/nspr/lib/ds/plarena.h
+++ /dev/null
@@ -1,258 +0,0 @@
-/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef plarena_h___
-#define plarena_h___
-/*
- * Lifetime-based fast allocation, inspired by much prior art, including
- * "Fast Allocation and Deallocation of Memory Based on Object Lifetimes"
- * David R. Hanson, Software -- Practice and Experience, Vol. 20(1).
- *
- * Also supports LIFO allocation (PL_ARENA_MARK/PL_ARENA_RELEASE).
- */
-#include "prtypes.h"
-#include "plarenas.h"
-
-PR_BEGIN_EXTERN_C
-
-typedef struct PLArena PLArena;
-
-struct PLArena {
- PLArena *next; /* next arena for this lifetime */
- PRUword base; /* aligned base address, follows this header */
- PRUword limit; /* one beyond last byte in arena */
- PRUword avail; /* points to next available byte */
-};
-
-#ifdef PL_ARENAMETER
-typedef struct PLArenaStats PLArenaStats;
-
-struct PLArenaStats {
- PLArenaStats *next; /* next in arenaStats list */
- char *name; /* name for debugging */
- PRUint32 narenas; /* number of arenas in pool */
- PRUint32 nallocs; /* number of PL_ARENA_ALLOCATE() calls */
- PRUint32 nreclaims; /* number of reclaims from freeArenas */
- PRUint32 nmallocs; /* number of malloc() calls */
- PRUint32 ndeallocs; /* number of lifetime deallocations */
- PRUint32 ngrows; /* number of PL_ARENA_GROW() calls */
- PRUint32 ninplace; /* number of in-place growths */
- PRUint32 nreleases; /* number of PL_ARENA_RELEASE() calls */
- PRUint32 nfastrels; /* number of "fast path" releases */
- PRUint32 nbytes; /* total bytes allocated */
- PRUint32 maxalloc; /* maximum allocation size in bytes */
- PRFloat64 variance; /* size variance accumulator */
-};
-#endif
-
-struct PLArenaPool {
- PLArena first; /* first arena in pool list */
- PLArena *current; /* arena from which to allocate space */
- PRUint32 arenasize; /* net exact size of a new arena */
- PRUword mask; /* alignment mask (power-of-2 - 1) */
-#ifdef PL_ARENAMETER
- PLArenaStats stats;
-#endif
-};
-
-/*
- * WARNING: The PL_MAKE_MEM_ macros are for internal use by NSPR. Do NOT use
- * them in your code.
- *
- * NOTE: Valgrind support to be added.
- *
- * The PL_MAKE_MEM_ macros are modeled after the MOZ_MAKE_MEM_ macros in
- * Mozilla's mfbt/MemoryChecking.h. Only AddressSanitizer is supported now.
- *
- * Provides a common interface to the ASan (AddressSanitizer) and Valgrind
- * functions used to mark memory in certain ways. In detail, the following
- * three macros are provided:
- *
- * PL_MAKE_MEM_NOACCESS - Mark memory as unsafe to access (e.g. freed)
- * PL_MAKE_MEM_UNDEFINED - Mark memory as accessible, with content undefined
- * PL_MAKE_MEM_DEFINED - Mark memory as accessible, with content defined
- *
- * With Valgrind in use, these directly map to the three respective Valgrind
- * macros. With ASan in use, the NOACCESS macro maps to poisoning the memory,
- * while the UNDEFINED/DEFINED macros unpoison memory.
- *
- * With no memory checker available, all macros expand to the empty statement.
- */
-
-/* WARNING: PL_SANITIZE_ADDRESS is for internal use by this header. Do NOT
- * define or test this macro in your code.
- */
-#if defined(__has_feature)
-#if __has_feature(address_sanitizer)
-#define PL_SANITIZE_ADDRESS 1
-#endif
-#elif defined(__SANITIZE_ADDRESS__)
-#define PL_SANITIZE_ADDRESS 1
-#endif
-
-#if defined(PL_SANITIZE_ADDRESS)
-
-/* These definitions are usually provided through the
- * sanitizer/asan_interface.h header installed by ASan.
- * See https://github.com/google/sanitizers/wiki/AddressSanitizerManualPoisoning
- */
-
-PR_IMPORT(void) __asan_poison_memory_region(void const volatile *addr, size_t size);
-PR_IMPORT(void) __asan_unpoison_memory_region(void const volatile *addr, size_t size);
-
-#define PL_MAKE_MEM_NOACCESS(addr, size) \
- __asan_poison_memory_region((addr), (size))
-
-#define PL_MAKE_MEM_UNDEFINED(addr, size) \
- __asan_unpoison_memory_region((addr), (size))
-
-#define PL_MAKE_MEM_DEFINED(addr, size) \
- __asan_unpoison_memory_region((addr), (size))
-
-#else
-
-#define PL_MAKE_MEM_NOACCESS(addr, size)
-#define PL_MAKE_MEM_UNDEFINED(addr, size)
-#define PL_MAKE_MEM_DEFINED(addr, size)
-
-#endif
-
-/*
- * If the including .c file uses only one power-of-2 alignment, it may define
- * PL_ARENA_CONST_ALIGN_MASK to the alignment mask and save a few instructions
- * per ALLOCATE and GROW.
- */
-#ifdef PL_ARENA_CONST_ALIGN_MASK
-#define PL_ARENA_ALIGN(pool, n) (((PRUword)(n) + PL_ARENA_CONST_ALIGN_MASK) \
- & ~PL_ARENA_CONST_ALIGN_MASK)
-
-#define PL_INIT_ARENA_POOL(pool, name, size) \
- PL_InitArenaPool(pool, name, size, PL_ARENA_CONST_ALIGN_MASK + 1)
-#else
-#define PL_ARENA_ALIGN(pool, n) (((PRUword)(n) + (pool)->mask) & ~(pool)->mask)
-#endif
-
-#define PL_ARENA_ALLOCATE(p, pool, nb) \
- PR_BEGIN_MACRO \
- PLArena *_a = (pool)->current; \
- PRUint32 _nb = PL_ARENA_ALIGN(pool, (PRUint32)nb); \
- PRUword _p = _a->avail; \
- if (_nb < (PRUint32)nb) { \
- _p = 0; \
- } else if (_nb > (_a->limit - _a->avail)) { \
- _p = (PRUword)PL_ArenaAllocate(pool, _nb); \
- } else { \
- _a->avail += _nb; \
- } \
- p = (void *)_p; \
- if (p) { \
- PL_MAKE_MEM_UNDEFINED(p, (PRUint32)nb); \
- PL_ArenaCountAllocation(pool, (PRUint32)nb); \
- } \
- PR_END_MACRO
-
-#define PL_ARENA_GROW(p, pool, size, incr) \
- PR_BEGIN_MACRO \
- PLArena *_a = (pool)->current; \
- PRUint32 _incr = PL_ARENA_ALIGN(pool, (PRUint32)incr); \
- if (_incr < (PRUint32)incr) { \
- p = NULL; \
- } else if (_a->avail == (PRUword)(p) + PL_ARENA_ALIGN(pool, size) && \
- _incr <= (_a->limit - _a->avail)) { \
- PL_MAKE_MEM_UNDEFINED((unsigned char *)(p) + size, (PRUint32)incr); \
- _a->avail += _incr; \
- PL_ArenaCountInplaceGrowth(pool, size, (PRUint32)incr); \
- } else { \
- p = PL_ArenaGrow(pool, p, size, (PRUint32)incr); \
- } \
- if (p) {\
- PL_ArenaCountGrowth(pool, size, (PRUint32)incr); \
- } \
- PR_END_MACRO
-
-#define PL_ARENA_MARK(pool) ((void *) (pool)->current->avail)
-#define PR_UPTRDIFF(p,q) ((PRUword)(p) - (PRUword)(q))
-
-#define PL_CLEAR_UNUSED_PATTERN(a, pattern) \
- PR_BEGIN_MACRO \
- PR_ASSERT((a)->avail <= (a)->limit); \
- PL_MAKE_MEM_UNDEFINED((void*)(a)->avail, (a)->limit - (a)->avail); \
- memset((void*)(a)->avail, (pattern), (a)->limit - (a)->avail); \
- PR_END_MACRO
-#ifdef DEBUG
-#define PL_FREE_PATTERN 0xDA
-#define PL_CLEAR_UNUSED(a) PL_CLEAR_UNUSED_PATTERN((a), PL_FREE_PATTERN)
-#define PL_CLEAR_ARENA(a) \
- PR_BEGIN_MACRO \
- PL_MAKE_MEM_UNDEFINED((void*)(a), (a)->limit - (PRUword)(a)); \
- memset((void*)(a), PL_FREE_PATTERN, (a)->limit - (PRUword)(a)); \
- PR_END_MACRO
-#else
-#define PL_CLEAR_UNUSED(a)
-#define PL_CLEAR_ARENA(a)
-#endif
-
-#define PL_ARENA_RELEASE(pool, mark) \
- PR_BEGIN_MACRO \
- char *_m = (char *)(mark); \
- PLArena *_a = (pool)->current; \
- if (PR_UPTRDIFF(_m, _a->base) <= PR_UPTRDIFF(_a->avail, _a->base)) { \
- _a->avail = (PRUword)PL_ARENA_ALIGN(pool, _m); \
- PL_CLEAR_UNUSED(_a); \
- PL_MAKE_MEM_NOACCESS((void*)_a->avail, _a->limit - _a->avail); \
- PL_ArenaCountRetract(pool, _m); \
- } else { \
- PL_ArenaRelease(pool, _m); \
- } \
- PL_ArenaCountRelease(pool, _m); \
- PR_END_MACRO
-
-#ifdef PL_ARENAMETER
-#define PL_COUNT_ARENA(pool,op) ((pool)->stats.narenas op)
-#else
-#define PL_COUNT_ARENA(pool,op)
-#endif
-
-#define PL_ARENA_DESTROY(pool, a, pnext) \
- PR_BEGIN_MACRO \
- PL_COUNT_ARENA(pool,--); \
- if ((pool)->current == (a)) (pool)->current = &(pool)->first; \
- *(pnext) = (a)->next; \
- PL_CLEAR_ARENA(a); \
- free(a); \
- (a) = 0; \
- PR_END_MACRO
-
-#ifdef PL_ARENAMETER
-
-#include <stdio.h>
-
-PR_EXTERN(void) PL_ArenaCountAllocation(PLArenaPool *pool, PRUint32 nb);
-
-PR_EXTERN(void) PL_ArenaCountInplaceGrowth(
- PLArenaPool *pool, PRUint32 size, PRUint32 incr);
-
-PR_EXTERN(void) PL_ArenaCountGrowth(
- PLArenaPool *pool, PRUint32 size, PRUint32 incr);
-
-PR_EXTERN(void) PL_ArenaCountRelease(PLArenaPool *pool, char *mark);
-
-PR_EXTERN(void) PL_ArenaCountRetract(PLArenaPool *pool, char *mark);
-
-PR_EXTERN(void) PL_DumpArenaStats(FILE *fp);
-
-#else /* !PL_ARENAMETER */
-
-#define PL_ArenaCountAllocation(ap, nb) /* nothing */
-#define PL_ArenaCountInplaceGrowth(ap, size, incr) /* nothing */
-#define PL_ArenaCountGrowth(ap, size, incr) /* nothing */
-#define PL_ArenaCountRelease(ap, mark) /* nothing */
-#define PL_ArenaCountRetract(ap, mark) /* nothing */
-
-#endif /* !PL_ARENAMETER */
-
-PR_END_EXTERN_C
-
-#endif /* plarena_h___ */
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