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271 lines
11 KiB
C++
271 lines
11 KiB
C++
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sw=4 et tw=98:
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code, released
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* March 31, 1998.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef jspropertycache_h___
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#define jspropertycache_h___
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#include "jsapi.h"
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#include "jsprvtd.h"
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#include "jstypes.h"
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namespace js {
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/*
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* Property cache with structurally typed capabilities for invalidation, for
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* polymorphic callsite method/get/set speedups. For details, see
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* <https://developer.mozilla.org/en/SpiderMonkey/Internals/Property_cache>.
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*/
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/* Property cache value capabilities. */
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enum {
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PCVCAP_PROTOBITS = 4,
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PCVCAP_PROTOSIZE = JS_BIT(PCVCAP_PROTOBITS),
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PCVCAP_PROTOMASK = JS_BITMASK(PCVCAP_PROTOBITS),
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PCVCAP_SCOPEBITS = 4,
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PCVCAP_SCOPESIZE = JS_BIT(PCVCAP_SCOPEBITS),
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PCVCAP_SCOPEMASK = JS_BITMASK(PCVCAP_SCOPEBITS),
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PCVCAP_TAGBITS = PCVCAP_PROTOBITS + PCVCAP_SCOPEBITS,
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PCVCAP_TAGMASK = JS_BITMASK(PCVCAP_TAGBITS)
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};
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const uint32 SHAPE_OVERFLOW_BIT = JS_BIT(32 - PCVCAP_TAGBITS);
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/*
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* Property cache value. This is simply a tagged union:
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* PCVal = (JSObject * | uint32 | JSScopeProperty *).
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* It is the type of PropertyCacheEntry::vword and combines with the tag bits
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* of PropertyCacheEntry::vcap to tell how to get or set the property, once a
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* property cache hit is validated.
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*
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* PropertyCache::purge depends on the bit-pattern of a null PCVal being 0.
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*/
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class PCVal
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{
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private:
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enum {
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OBJECT = 0,
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SLOT = 1,
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SPROP = 2,
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TAG = 3
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};
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jsuword v;
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public:
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bool isNull() const { return v == 0; }
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void setNull() { v = 0; }
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bool isObject() const { return (v & TAG) == OBJECT; }
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JSObject *toObject() const { JS_ASSERT(isObject()); return reinterpret_cast<JSObject *>(v); }
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jsval toJsval() const { return OBJECT_TO_JSVAL(toObject()); }
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void setObject(JSObject *obj) { v = reinterpret_cast<jsuword>(obj); }
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bool isSlot() const { return v & SLOT; }
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uint32 toSlot() const { JS_ASSERT(isSlot()); return uint32(v) >> 1; }
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void setSlot(uint32 slot) { v = (jsuword(slot) << 1) | SLOT; }
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bool isSprop() const { return (v & TAG) == SPROP; }
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JSScopeProperty *toSprop() const { JS_ASSERT(isSprop()); return reinterpret_cast<JSScopeProperty *>(v & ~TAG); }
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void setSprop(JSScopeProperty *sprop) { JS_ASSERT(sprop); v = reinterpret_cast<jsuword>(sprop) | SPROP; }
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};
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struct PropertyCacheEntry
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{
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jsbytecode *kpc; /* pc of cache-testing bytecode */
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jsuword kshape; /* shape of direct (key) object */
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jsuword vcap; /* value capability, see above */
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PCVal vword; /* value word, see PCVal above */
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bool adding() const { return vcapTag() == 0 && kshape != vshape(); }
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bool directHit() const { return vcapTag() == 0 && kshape == vshape(); }
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jsuword vcapTag() const { return vcap & PCVCAP_TAGMASK; }
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uint32 vshape() const { return uint32(vcap >> PCVCAP_TAGBITS); }
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jsuword scopeIndex() const { return (vcap >> PCVCAP_PROTOBITS) & PCVCAP_SCOPEMASK; }
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jsuword protoIndex() const { return vcap & PCVCAP_PROTOMASK; }
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void assign(jsbytecode *kpc, jsuword kshape, jsuword vshape,
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uintN scopeIndex, uintN protoIndex, PCVal vword) {
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JS_ASSERT(kshape < SHAPE_OVERFLOW_BIT);
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JS_ASSERT(vshape < SHAPE_OVERFLOW_BIT);
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JS_ASSERT(scopeIndex <= PCVCAP_SCOPEMASK);
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JS_ASSERT(protoIndex <= PCVCAP_PROTOMASK);
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this->kpc = kpc;
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this->kshape = kshape;
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this->vcap = (vshape << PCVCAP_TAGBITS) | (scopeIndex << PCVCAP_PROTOBITS) | protoIndex;
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this->vword = vword;
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}
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};
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/*
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* Special value for functions returning PropertyCacheEntry * to distinguish
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* between failure and no no-cache-fill cases.
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*/
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#define JS_NO_PROP_CACHE_FILL ((js::PropertyCacheEntry *) NULL + 1)
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#if defined DEBUG_brendan || defined DEBUG_brendaneich
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#define JS_PROPERTY_CACHE_METERING 1
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#endif
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class PropertyCache
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{
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private:
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enum {
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SIZE_LOG2 = 12,
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SIZE = JS_BIT(SIZE_LOG2),
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MASK = JS_BITMASK(SIZE_LOG2)
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};
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PropertyCacheEntry table[SIZE];
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JSBool empty;
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#ifdef JS_PROPERTY_CACHE_METERING
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public:
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PropertyCacheEntry *pctestentry; /* entry of the last PC-based test */
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uint32 fills; /* number of cache entry fills */
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uint32 nofills; /* couldn't fill (e.g. default get) */
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uint32 rofills; /* set on read-only prop can't fill */
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uint32 disfills; /* fill attempts on disabled cache */
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uint32 oddfills; /* fill attempt after setter deleted */
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uint32 modfills; /* fill that rehashed to a new entry */
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uint32 brandfills; /* scope brandings to type structural
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method fills */
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uint32 noprotos; /* resolve-returned non-proto pobj */
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uint32 longchains; /* overlong scope and/or proto chain */
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uint32 recycles; /* cache entries recycled by fills */
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uint32 tests; /* cache probes */
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uint32 pchits; /* fast-path polymorphic op hits */
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uint32 protopchits; /* pchits hitting immediate prototype */
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uint32 initests; /* cache probes from JSOP_INITPROP */
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uint32 inipchits; /* init'ing next property pchit case */
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uint32 inipcmisses; /* init'ing next property pc misses */
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uint32 settests; /* cache probes from JOF_SET opcodes */
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uint32 addpchits; /* adding next property pchit case */
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uint32 setpchits; /* setting existing property pchit */
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uint32 setpcmisses; /* setting/adding property pc misses */
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uint32 setmisses; /* JSOP_SET{NAME,PROP} total misses */
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uint32 kpcmisses; /* slow-path key id == atom misses */
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uint32 kshapemisses; /* slow-path key object misses */
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uint32 vcapmisses; /* value capability misses */
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uint32 misses; /* cache misses */
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uint32 flushes; /* cache flushes */
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uint32 pcpurges; /* shadowing purges on proto chain */
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private:
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# define PCMETER(x) x
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#else
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# define PCMETER(x) ((void)0)
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#endif
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/*
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* Add kshape rather than xor it to avoid collisions between nearby bytecode
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* that are evolving an object by setting successive properties, incrementing
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* the object's scope->shape on each set.
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*/
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static inline jsuword
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hash(jsbytecode *pc, jsuword kshape)
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{
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return ((((jsuword(pc) >> SIZE_LOG2) ^ jsuword(pc)) + kshape) & MASK);
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}
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static inline bool matchShape(JSContext *cx, JSObject *obj, uint32 shape);
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JS_REQUIRES_STACK JSAtom *fullTest(JSContext *cx, jsbytecode *pc, JSObject **objp,
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JSObject **pobjp, PropertyCacheEntry *entry);
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#ifdef DEBUG
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void assertEmpty();
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#else
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inline void assertEmpty() {}
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#endif
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public:
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JS_ALWAYS_INLINE JS_REQUIRES_STACK void test(JSContext *cx, jsbytecode *pc,
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JSObject *&obj, JSObject *&pobj,
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PropertyCacheEntry *&entry, JSAtom *&atom);
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/*
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* Test for cached information about a property set on *objp at pc.
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*
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* On a fast hit, set *entryp to the entry and return true.
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*
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* On a slow hit, set *entryp to the entry, set *obj2p to the object that
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* owns the property (either obj or a prototype), set *atomp to NULL, and
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* return false.
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*
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* On a miss, set *atomp to the name of the property being set and return false.
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*/
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JS_ALWAYS_INLINE bool testForSet(JSContext *cx, jsbytecode *pc, JSObject *obj,
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PropertyCacheEntry **entryp, JSObject **obj2p,
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JSAtom **atomp);
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/*
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* Test for cached information about creating a new own data property on obj at pc.
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*
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* On a hit, set *spropp to an sprop from the property tree describing the
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* new property as well as all existing properties on obj and return
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* true. Otherwise return false.
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*
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* Hit or miss, *entryp receives a pointer to the property cache entry.
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*/
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JS_ALWAYS_INLINE bool testForInit(JSRuntime *rt, jsbytecode *pc, JSObject *obj, JSScope *scope,
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JSScopeProperty **spropp, PropertyCacheEntry **entryp);
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/*
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* Fill property cache entry for key cx->fp->pc, optimized value word
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* computed from obj and sprop, and entry capability forged from 24-bit
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* obj->shape(), 4-bit scopeIndex, and 4-bit protoIndex.
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*
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* Return the filled cache entry or JS_NO_PROP_CACHE_FILL if caching was
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* not possible.
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*/
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JS_REQUIRES_STACK PropertyCacheEntry *fill(JSContext *cx, JSObject *obj, uintN scopeIndex,
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uintN protoIndex, JSObject *pobj,
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JSScopeProperty *sprop, JSBool adding = false);
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void purge(JSContext *cx);
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void purgeForScript(JSScript *script);
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};
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} /* namespace js */
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#endif /* jspropertycache_h___ */
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