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Bug 1163790 - Part 2: Share inlined Class tracing between marking and tenuring; r=bhackett

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This commit is contained in:
Terrence Cole 2015-05-13 11:06:52 -07:00
parent 85251d3e4c
commit 3777bd583f
2 changed files with 59 additions and 64 deletions
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2
js/src/builtin/TypedObject.h
View File

@ -605,7 +605,7 @@ class TypedObject : public JSObject
static bool GetBuffer(JSContext* cx, unsigned argc, Value* vp);
static bool GetByteOffset(JSContext* cx, unsigned argc, Value* vp);
Shape* shapeFromGC() { return shape_; }
Shape** addressOfShapeFromGC() { return shape_.unsafeGet(); }
};
typedef Handle<TypedObject*> HandleTypedObject;

121
js/src/gc/Marking.cpp
View File

@ -1066,6 +1066,60 @@ struct TraverseObjectFunctor
}
};
// Call the trace hook set on the object, if present. If further tracing of
// NativeObject fields is required, this will return the native object.
template <typename Functor, typename... Args>
static inline NativeObject*
CallTraceHook(Functor f, JSTracer* trc, JSObject* obj, Args&&... args)
{
const Class* clasp = obj->getClass();
MOZ_ASSERT(clasp);
MOZ_ASSERT(obj->isNative() == clasp->isNative());
if (!clasp->trace)
return &obj->as<NativeObject>();
// Global objects all have the same trace hook. That hook is safe without barriers
// if the global has no custom trace hook of its own, or has been moved to a different
// compartment, and so can't have one.
MOZ_ASSERT_IF(!(clasp->trace == JS_GlobalObjectTraceHook &&
(!obj->compartment()->options().getTrace() || !obj->isOwnGlobal())),
clasp->flags & JSCLASS_IMPLEMENTS_BARRIERS);
if (clasp->trace == InlineTypedObject::obj_trace) {
Shape** pshape = obj->as<InlineTypedObject>().addressOfShapeFromGC();
f(pshape, mozilla::Forward<Args>(args)...);
InlineTypedObject& tobj = obj->as<InlineTypedObject>();
if (tobj.typeDescr().hasTraceList()) {
VisitTraceList(f, tobj.typeDescr().traceList(), tobj.inlineTypedMem(),
mozilla::Forward<Args>(args)...);
}
return nullptr;
}
if (clasp == &UnboxedPlainObject::class_) {
JSObject** pexpando = obj->as<UnboxedPlainObject>().addressOfExpando();
if (*pexpando)
f(pexpando, mozilla::Forward<Args>(args)...);
UnboxedPlainObject& unboxed = obj->as<UnboxedPlainObject>();
if (unboxed.layout().traceList()) {
VisitTraceList(f, unboxed.layout().traceList(), unboxed.data(),
mozilla::Forward<Args>(args)...);
}
return nullptr;
}
clasp->trace(trc, obj);
if (!clasp->isNative())
return nullptr;
return &obj->as<NativeObject>();
}
template <typename F, typename... Args>
static void
VisitTraceList(F f, const int32_t* traceList, uint8_t* memory, Args&&... args)
@ -1236,44 +1290,10 @@ GCMarker::processMarkStackTop(SliceBudget& budget)
ObjectGroup* group = obj->groupFromGC();
traverseEdge(obj, group);
/* Call the trace hook if necessary. */
const Class* clasp = group->clasp();
if (clasp->trace) {
// Global objects all have the same trace hook. That hook is safe without barriers
// if the global has no custom trace hook of its own, or has been moved to a different
// compartment, and so can't have one.
MOZ_ASSERT_IF(!(clasp->trace == JS_GlobalObjectTraceHook &&
(!obj->compartment()->options().getTrace() || !obj->isOwnGlobal())),
clasp->flags & JSCLASS_IMPLEMENTS_BARRIERS);
if (clasp->trace == InlineTypedObject::obj_trace) {
Shape* shape = obj->as<InlineTypedObject>().shapeFromGC();
traverseEdge(obj, shape);
InlineTypedObject& tobj = obj->as<InlineTypedObject>();
if (tobj.typeDescr().hasTraceList()) {
VisitTraceList(TraverseObjectFunctor(), tobj.typeDescr().traceList(),
tobj.inlineTypedMem(), this, obj);
}
return;
}
if (clasp == &UnboxedPlainObject::class_) {
JSObject* expando = obj->as<UnboxedPlainObject>().maybeExpando();
if (expando)
traverseEdge(obj, expando);
UnboxedPlainObject& unboxed = obj->as<UnboxedPlainObject>();
if (unboxed.layout().traceList()) {
VisitTraceList(TraverseObjectFunctor(), unboxed.layout().traceList(),
unboxed.data(), this, obj);
}
return;
}
clasp->trace(this, obj);
}
if (!clasp->isNative())
NativeObject *nobj = CallTraceHook(TraverseObjectFunctor(), this, obj, this, obj);
if (!nobj)
return;
NativeObject* nobj = &obj->as<NativeObject>();
Shape* shape = nobj->lastProperty();
traverseEdge(obj, shape);
@ -1919,34 +1939,9 @@ struct TenuringFunctor
void
js::TenuringTracer::traceObject(JSObject* obj)
{
const Class* clasp = obj->getClass();
if (clasp->trace) {
if (clasp->trace == InlineTypedObject::obj_trace) {
InlineTypedObject& tobj = obj->as<InlineTypedObject>();
if (tobj.typeDescr().hasTraceList()) {
VisitTraceList(TenuringFunctor(), tobj.typeDescr().traceList(),
tobj.inlineTypedMem(), *this);
}
return;
}
if (clasp == &UnboxedPlainObject::class_) {
JSObject** pexpando = obj->as<UnboxedPlainObject>().addressOfExpando();
if (*pexpando)
traverse(pexpando);
UnboxedPlainObject& unboxed = obj->as<UnboxedPlainObject>();
if (unboxed.layout().traceList()) {
VisitTraceList(TenuringFunctor(), unboxed.layout().traceList(), unboxed.data(),
*this);
}
return;
}
clasp->trace(this, obj);
}
MOZ_ASSERT(obj->isNative() == clasp->isNative());
if (!clasp->isNative())
NativeObject *nobj = CallTraceHook(TenuringFunctor(), this, obj, *this);
if (!nobj)
return;
NativeObject* nobj = &obj->as<NativeObject>();
// Note: the contents of copy on write elements pointers are filled in
// during parsing and cannot contain nursery pointers.