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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
* 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 vm_UnboxedObject_inl_h
#define vm_UnboxedObject_inl_h
#include "vm/UnboxedObject.h"
#include "gc/StoreBuffer-inl.h"
#include "vm/ArrayObject-inl.h"
#include "vm/NativeObject-inl.h"
namespace js {
static inline Value
GetUnboxedValue(uint8_t* p, JSValueType type, bool maybeUninitialized)
{
switch (type) {
case JSVAL_TYPE_BOOLEAN:
return BooleanValue(*p != 0);
case JSVAL_TYPE_INT32:
return Int32Value(*reinterpret_cast<int32_t*>(p));
case JSVAL_TYPE_DOUBLE: {
// During unboxed plain object creation, non-GC thing properties are
// left uninitialized. This is normally fine, since the properties will
// be filled in shortly, but if they are read before that happens we
// need to make sure that doubles are canonical.
double d = *reinterpret_cast<double*>(p);
if (maybeUninitialized)
return DoubleValue(JS::CanonicalizeNaN(d));
return DoubleValue(d);
}
case JSVAL_TYPE_STRING:
return StringValue(*reinterpret_cast<JSString**>(p));
case JSVAL_TYPE_OBJECT:
return ObjectOrNullValue(*reinterpret_cast<JSObject**>(p));
default:
MOZ_CRASH("Invalid type for unboxed value");
}
}
static inline void
SetUnboxedValueNoTypeChange(JSObject* unboxedObject,
uint8_t* p, JSValueType type, const Value& v,
bool preBarrier)
{
switch (type) {
case JSVAL_TYPE_BOOLEAN:
*p = v.toBoolean();
return;
case JSVAL_TYPE_INT32:
*reinterpret_cast<int32_t*>(p) = v.toInt32();
return;
case JSVAL_TYPE_DOUBLE:
*reinterpret_cast<double*>(p) = v.toNumber();
return;
case JSVAL_TYPE_STRING: {
MOZ_ASSERT(!IsInsideNursery(v.toString()));
JSString** np = reinterpret_cast<JSString**>(p);
if (preBarrier)
JSString::writeBarrierPre(*np);
*np = v.toString();
return;
}
case JSVAL_TYPE_OBJECT: {
JSObject** np = reinterpret_cast<JSObject**>(p);
// Manually trigger post barriers on the whole object. If we treat
// the pointer as a HeapPtrObject we will get confused later if the
// object is converted to its native representation.
JSObject* obj = v.toObjectOrNull();
if (IsInsideNursery(obj) && !IsInsideNursery(unboxedObject)) {
JSRuntime* rt = unboxedObject->runtimeFromMainThread();
rt->gc.storeBuffer.putWholeCell(unboxedObject);
}
if (preBarrier)
JSObject::writeBarrierPre(*np);
*np = obj;
return;
}
default:
MOZ_CRASH("Invalid type for unboxed value");
}
}
static inline bool
SetUnboxedValue(ExclusiveContext* cx, JSObject* unboxedObject, jsid id,
uint8_t* p, JSValueType type, const Value& v, bool preBarrier)
{
switch (type) {
case JSVAL_TYPE_BOOLEAN:
if (v.isBoolean()) {
*p = v.toBoolean();
return true;
}
return false;
case JSVAL_TYPE_INT32:
if (v.isInt32()) {
*reinterpret_cast<int32_t*>(p) = v.toInt32();
return true;
}
return false;
case JSVAL_TYPE_DOUBLE:
if (v.isNumber()) {
*reinterpret_cast<double*>(p) = v.toNumber();
return true;
}
return false;
case JSVAL_TYPE_STRING:
if (v.isString()) {
MOZ_ASSERT(!IsInsideNursery(v.toString()));
JSString** np = reinterpret_cast<JSString**>(p);
if (preBarrier)
JSString::writeBarrierPre(*np);
*np = v.toString();
return true;
}
return false;
case JSVAL_TYPE_OBJECT:
if (v.isObjectOrNull()) {
JSObject** np = reinterpret_cast<JSObject**>(p);
// Update property types when writing object properties. Types for
// other properties were captured when the unboxed layout was
// created.
AddTypePropertyId(cx, unboxedObject, id, v);
// As above, trigger post barriers on the whole object.
JSObject* obj = v.toObjectOrNull();
if (IsInsideNursery(v.toObjectOrNull()) && !IsInsideNursery(unboxedObject)) {
JSRuntime* rt = unboxedObject->runtimeFromMainThread();
rt->gc.storeBuffer.putWholeCell(unboxedObject);
}
if (preBarrier)
JSObject::writeBarrierPre(*np);
*np = obj;
return true;
}
return false;
default:
MOZ_CRASH("Invalid type for unboxed value");
}
}
/////////////////////////////////////////////////////////////////////
// UnboxedPlainObject
/////////////////////////////////////////////////////////////////////
inline const UnboxedLayout&
UnboxedPlainObject::layout() const
{
return group()->unboxedLayout();
}
/////////////////////////////////////////////////////////////////////
// Template methods for NativeObject and UnboxedArrayObject accesses.
/////////////////////////////////////////////////////////////////////
static inline DenseElementResult
SetOrExtendBoxedOrUnboxedDenseElements(ExclusiveContext* cx, JSObject* obj,
uint32_t start, const Value* vp, uint32_t count,
ShouldUpdateTypes updateTypes = ShouldUpdateTypes::Update)
{
NativeObject* nobj = &obj->as<NativeObject>();
if (nobj->denseElementsAreFrozen())
return DenseElementResult::Incomplete;
if (obj->is<ArrayObject>() &&
!obj->as<ArrayObject>().lengthIsWritable() &&
start + count >= obj->as<ArrayObject>().length())
{
return DenseElementResult::Incomplete;
}
DenseElementResult result = nobj->ensureDenseElements(cx, start, count);
if (result != DenseElementResult::Success)
return result;
if (obj->is<ArrayObject>() && start + count >= obj->as<ArrayObject>().length())
obj->as<ArrayObject>().setLengthInt32(start + count);
if (updateTypes == ShouldUpdateTypes::DontUpdate && !nobj->shouldConvertDoubleElements()) {
nobj->copyDenseElements(start, vp, count);
} else {
for (size_t i = 0; i < count; i++)
nobj->setDenseElementWithType(cx, start + i, vp[i]);
}
return DenseElementResult::Success;
}
static inline DenseElementResult
MoveBoxedOrUnboxedDenseElements(JSContext* cx, JSObject* obj, uint32_t dstStart, uint32_t srcStart,
uint32_t length)
{
MOZ_ASSERT(obj->isNative());
if (obj->as<NativeObject>().denseElementsAreFrozen())
return DenseElementResult::Incomplete;
if (!obj->as<NativeObject>().maybeCopyElementsForWrite(cx))
return DenseElementResult::Failure;
obj->as<NativeObject>().moveDenseElements(dstStart, srcStart, length);
return DenseElementResult::Success;
}
} // namespace js
#endif // vm_UnboxedObject_inl_h
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