/usr/include/firefox/jspropertycache.h is in firefox-dev 11.0+build1-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sw=4 et tw=98:
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef jspropertycache_h___
#define jspropertycache_h___
#include "jsapi.h"
#include "jsprvtd.h"
#include "jstypes.h"
namespace js {
/*
* Property cache with structurally typed capabilities for invalidation, for
* polymorphic callsite method/get/set speedups. For details, see
* <https://developer.mozilla.org/en/SpiderMonkey/Internals/Property_cache>.
*/
/* Indexing for property cache entry scope and prototype chain walking. */
enum {
PCINDEX_PROTOBITS = 4,
PCINDEX_PROTOSIZE = JS_BIT(PCINDEX_PROTOBITS),
PCINDEX_PROTOMASK = JS_BITMASK(PCINDEX_PROTOBITS),
PCINDEX_SCOPEBITS = 4,
PCINDEX_SCOPESIZE = JS_BIT(PCINDEX_SCOPEBITS),
PCINDEX_SCOPEMASK = JS_BITMASK(PCINDEX_SCOPEBITS)
};
struct PropertyCacheEntry
{
jsbytecode *kpc; /* pc of cache-testing bytecode */
const Shape *kshape; /* shape of direct (key) object */
const Shape *pshape; /* shape of owning object */
const Shape *prop; /* shape of accessed property */
uint16_t vindex; /* scope/proto chain indexing,
* see PCINDEX above */
bool directHit() const { return vindex == 0; }
void assign(jsbytecode *kpc, const Shape *kshape, const Shape *pshape,
const Shape *prop, uintN scopeIndex, uintN protoIndex) {
JS_ASSERT(scopeIndex <= PCINDEX_SCOPEMASK);
JS_ASSERT(protoIndex <= PCINDEX_PROTOMASK);
this->kpc = kpc;
this->kshape = kshape;
this->pshape = pshape;
this->prop = prop;
this->vindex = (scopeIndex << PCINDEX_PROTOBITS) | protoIndex;
}
};
/*
* Special value for functions returning PropertyCacheEntry * to distinguish
* between failure and no no-cache-fill cases.
*/
#define JS_NO_PROP_CACHE_FILL ((js::PropertyCacheEntry *) NULL + 1)
#if defined DEBUG_brendan || defined DEBUG_brendaneich
#define JS_PROPERTY_CACHE_METERING 1
#endif
class PropertyCache
{
private:
enum {
SIZE_LOG2 = 12,
SIZE = JS_BIT(SIZE_LOG2),
MASK = JS_BITMASK(SIZE_LOG2)
};
PropertyCacheEntry table[SIZE];
JSBool empty;
public:
#ifdef JS_PROPERTY_CACHE_METERING
PropertyCacheEntry *pctestentry; /* entry of the last PC-based test */
uint32_t fills; /* number of cache entry fills */
uint32_t nofills; /* couldn't fill (e.g. default get) */
uint32_t rofills; /* set on read-only prop can't fill */
uint32_t disfills; /* fill attempts on disabled cache */
uint32_t oddfills; /* fill attempt after setter deleted */
uint32_t add2dictfills; /* fill attempt on dictionary object */
uint32_t modfills; /* fill that rehashed to a new entry */
uint32_t brandfills; /* scope brandings to type structural
method fills */
uint32_t noprotos; /* resolve-returned non-proto pobj */
uint32_t longchains; /* overlong scope and/or proto chain */
uint32_t recycles; /* cache entries recycled by fills */
uint32_t tests; /* cache probes */
uint32_t pchits; /* fast-path polymorphic op hits */
uint32_t protopchits; /* pchits hitting immediate prototype */
uint32_t initests; /* cache probes from JSOP_INITPROP */
uint32_t inipchits; /* init'ing next property pchit case */
uint32_t inipcmisses; /* init'ing next property pc misses */
uint32_t settests; /* cache probes from JOF_SET opcodes */
uint32_t addpchits; /* adding next property pchit case */
uint32_t setpchits; /* setting existing property pchit */
uint32_t setpcmisses; /* setting/adding property pc misses */
uint32_t setmisses; /* JSOP_SET{NAME,PROP} total misses */
uint32_t kpcmisses; /* slow-path key id == atom misses */
uint32_t kshapemisses; /* slow-path key object misses */
uint32_t vcapmisses; /* value capability misses */
uint32_t misses; /* cache misses */
uint32_t flushes; /* cache flushes */
uint32_t pcpurges; /* shadowing purges on proto chain */
# define PCMETER(x) x
#else
# define PCMETER(x) ((void)0)
#endif
PropertyCache() {
PodZero(this);
}
private:
static inline jsuword
hash(jsbytecode *pc, const Shape *kshape)
{
return (((jsuword(pc) >> SIZE_LOG2) ^ jsuword(pc) ^ ((jsuword)kshape >> 3)) & MASK);
}
static inline bool matchShape(JSContext *cx, JSObject *obj, uint32_t shape);
JS_REQUIRES_STACK JSAtom *fullTest(JSContext *cx, jsbytecode *pc, JSObject **objp,
JSObject **pobjp, PropertyCacheEntry *entry);
#ifdef DEBUG
void assertEmpty();
#else
inline void assertEmpty() {}
#endif
public:
JS_ALWAYS_INLINE JS_REQUIRES_STACK void test(JSContext *cx, jsbytecode *pc,
JSObject *&obj, JSObject *&pobj,
PropertyCacheEntry *&entry, JSAtom *&atom);
/*
* Test for cached information about a property set on *objp at pc.
*
* On a hit, set *entryp to the entry and return true.
*
* On a miss, set *atomp to the name of the property being set and return false.
*/
JS_ALWAYS_INLINE bool testForSet(JSContext *cx, jsbytecode *pc, JSObject *obj,
PropertyCacheEntry **entryp, JSObject **obj2p,
JSAtom **atomp);
/*
* Fill property cache entry for key cx->fp->pc, optimized value word
* computed from obj and shape, and entry capability forged from 24-bit
* obj->shape(), 4-bit scopeIndex, and 4-bit protoIndex.
*
* Return the filled cache entry or JS_NO_PROP_CACHE_FILL if caching was
* not possible.
*/
JS_REQUIRES_STACK PropertyCacheEntry *fill(JSContext *cx, JSObject *obj, uintN scopeIndex,
JSObject *pobj, const js::Shape *shape);
void purge(JSContext *cx);
/* Restore an entry that may have been purged during a GC. */
void restore(PropertyCacheEntry *entry);
};
} /* namespace js */
#endif /* jspropertycache_h___ */
|