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Bug 602441 - Remove nigh-unreachable property-cache-testing code (modulo MT objects, nearing complete removal from SpiderMonkey) in the property-setting codepath. r=brendan

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--HG--
extra : rebase_source : 38ed65e2dde3b80086be6da4a75120d24759df81
This commit is contained in:
Jeff Walden 2010-10-07 13:59:23 -07:00
parent 4500a1845e
commit c2c3186f83
4 changed files with 26 additions and 61 deletions
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34
js/src/jsinterp.cpp
View File

@ -4288,13 +4288,13 @@ BEGIN_CASE(JSOP_SETMETHOD)
JSAtom *atom;
if (cache->testForSet(cx, regs.pc, obj, &entry, &obj2, &atom)) {
/*
* Fast property cache hit, only partially confirmed by
* testForSet. We know that the entry applies to regs.pc and
* that obj's shape matches.
* Property cache hit, only partially confirmed by testForSet. We
* know that the entry applies to regs.pc and that obj's shape
* matches.
*
* The entry predicts either a new property to be added
* directly to obj by this set, or on an existing "own"
* property, or on a prototype property that has a setter.
* The entry predicts either a new property to be added directly to
* obj by this set, or on an existing "own" property, or on a
* prototype property that has a setter.
*/
const Shape *shape = entry->vword.toShape();
JS_ASSERT_IF(shape->isDataDescriptor(), shape->writable());
@ -4385,26 +4385,12 @@ BEGIN_CASE(JSOP_SETMETHOD)
}
}
PCMETER(cache->setpcmisses++);
atom = NULL;
} else if (!atom) {
/*
* Slower property cache hit, fully confirmed by testForSet (in the
* slow path, via fullTest).
*/
ASSERT_VALID_PROPERTY_CACHE_HIT(0, obj, obj2, entry);
const Shape *shape = NULL;
if (obj == obj2) {
shape = entry->vword.toShape();
JS_ASSERT(shape->writable());
JS_ASSERT(obj2->isExtensible());
NATIVE_SET(cx, obj, shape, entry, &rval);
}
if (shape)
break;
LOAD_ATOM(0, atom);
} else {
JS_ASSERT(atom);
}
if (!atom)
LOAD_ATOM(0, atom);
jsid id = ATOM_TO_JSID(atom);
if (entry && JS_LIKELY(!obj->getOps()->setProperty)) {
uintN defineHow;

6
js/src/jspropertycache.h
View File

@ -236,11 +236,7 @@ class PropertyCache
/*
* Test for cached information about a property set on *objp at pc.
*
* On a fast hit, set *entryp to the entry and return true.
*
* On a slow hit, set *entryp to the entry, set *obj2p to the object that
* owns the property (either obj or a prototype), set *atomp to NULL, and
* return false.
* 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.
*/

14
js/src/jspropertycacheinlines.h
View File

@ -115,16 +115,12 @@ PropertyCache::testForSet(JSContext *cx, jsbytecode *pc, JSObject *obj,
if (entry->kpc == pc && entry->kshape == shape && CX_OWNS_OBJECT_TITLE(cx, obj))
return true;
#ifdef DEBUG
JSObject *orig = obj;
#endif
JSAtom *atom = fullTest(cx, pc, &obj, obj2p, entry);
if (atom) {
PCMETER(misses++);
PCMETER(setmisses++);
} else {
JS_ASSERT(obj == orig);
}
JS_ASSERT(atom);
PCMETER(misses++);
PCMETER(setmisses++);
*atomp = atom;
return false;
}

33
js/src/methodjit/StubCalls.cpp
View File

@ -144,13 +144,13 @@ stubs::SetName(VMFrame &f, JSAtom *origAtom)
JSAtom *atom;
if (cache->testForSet(cx, f.regs.pc, obj, &entry, &obj2, &atom)) {
/*
* Fast property cache hit, only partially confirmed by
* testForSet. We know that the entry applies to regs.pc and
* that obj's shape matches.
* Property cache hit, only partially confirmed by testForSet. We
* know that the entry applies to regs.pc and that obj's shape
* matches.
*
* The entry predicts either a new property to be added
* directly to obj by this set, or on an existing "own"
* property, or on a prototype property that has a setter.
* The entry predicts either a new property to be added directly to
* obj by this set, or on an existing "own" property, or on a
* prototype property that has a setter.
*/
const Shape *shape = entry->vword.toShape();
JS_ASSERT_IF(shape->isDataDescriptor(), shape->writable());
@ -240,25 +240,12 @@ stubs::SetName(VMFrame &f, JSAtom *origAtom)
}
}
PCMETER(cache->setpcmisses++);
atom = NULL;
} else if (!atom) {
/*
* Slower property cache hit, fully confirmed by testForSet (in the
* slow path, via fullTest).
*/
const Shape *shape = NULL;
if (obj == obj2) {
shape = entry->vword.toShape();
JS_ASSERT(shape->writable());
JS_ASSERT(obj2->isExtensible());
NATIVE_SET(cx, obj, shape, entry, &rval);
}
if (shape)
break;
atom = origAtom;
} else {
JS_ASSERT(atom);
}
if (!atom)
atom = origAtom;
jsid id = ATOM_TO_JSID(atom);
if (entry && JS_LIKELY(!obj->getOps()->setProperty)) {
uintN defineHow;