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-rw-r--r--js/src/vm/ObjectGroup.h62
1 files changed, 55 insertions, 7 deletions
diff --git a/js/src/vm/ObjectGroup.h b/js/src/vm/ObjectGroup.h
index 0b6eaee51..553cb8366 100644
--- a/js/src/vm/ObjectGroup.h
+++ b/js/src/vm/ObjectGroup.h
@@ -20,6 +20,7 @@
namespace js {
class TypeDescr;
+class UnboxedLayout;
class PreliminaryObjectArrayWithTemplate;
class TypeNewScript;
@@ -153,6 +154,16 @@ class ObjectGroup : public gc::TenuredCell
// For some plain objects, the addendum stores a PreliminaryObjectArrayWithTemplate.
Addendum_PreliminaryObjects,
+ // When objects in this group have an unboxed representation, the
+ // addendum stores an UnboxedLayout (which might have a TypeNewScript
+ // as well, if the group is also constructed using 'new').
+ Addendum_UnboxedLayout,
+
+ // If this group is used by objects that have been converted from an
+ // unboxed representation and/or have the same allocation kind as such
+ // objects, the addendum points to that unboxed group.
+ Addendum_OriginalUnboxedGroup,
+
// When used by typed objects, the addendum stores a TypeDescr.
Addendum_TypeDescr
};
@@ -174,6 +185,7 @@ class ObjectGroup : public gc::TenuredCell
return nullptr;
}
+ TypeNewScript* anyNewScript();
void detachNewScript(bool writeBarrier, ObjectGroup* replacement);
ObjectGroupFlags flagsDontCheckGeneration() const {
@@ -213,6 +225,34 @@ class ObjectGroup : public gc::TenuredCell
maybePreliminaryObjectsDontCheckGeneration();
}
+ inline UnboxedLayout* maybeUnboxedLayout();
+ inline UnboxedLayout& unboxedLayout();
+
+ UnboxedLayout* maybeUnboxedLayoutDontCheckGeneration() const {
+ if (addendumKind() == Addendum_UnboxedLayout)
+ return reinterpret_cast<UnboxedLayout*>(addendum_);
+ return nullptr;
+ }
+
+ UnboxedLayout& unboxedLayoutDontCheckGeneration() const {
+ MOZ_ASSERT(addendumKind() == Addendum_UnboxedLayout);
+ return *maybeUnboxedLayoutDontCheckGeneration();
+ }
+
+ void setUnboxedLayout(UnboxedLayout* layout) {
+ setAddendum(Addendum_UnboxedLayout, layout);
+ }
+
+ ObjectGroup* maybeOriginalUnboxedGroup() const {
+ if (addendumKind() == Addendum_OriginalUnboxedGroup)
+ return reinterpret_cast<ObjectGroup*>(addendum_);
+ return nullptr;
+ }
+
+ void setOriginalUnboxedGroup(ObjectGroup* group) {
+ setAddendum(Addendum_OriginalUnboxedGroup, group);
+ }
+
TypeDescr* maybeTypeDescr() {
// Note: there is no need to sweep when accessing the type descriptor
// of an object, as it is strongly held and immutable.
@@ -273,8 +313,9 @@ class ObjectGroup : public gc::TenuredCell
* that can be read out of that property in actual JS objects. In native
* objects, property types account for plain data properties (those with a
* slot and no getter or setter hook) and dense elements. In typed objects
- * property types account for object and value properties and elements in
- * the object.
+ * and unboxed objects, property types account for object and value
+ * properties and elements in the object, and expando properties in unboxed
+ * objects.
*
* For accesses on these properties, the correspondence is as follows:
*
@@ -297,9 +338,10 @@ class ObjectGroup : public gc::TenuredCell
* 2. Array lengths are special cased by the compiler and VM and are not
* reflected in property types.
*
- * 3. In typed objects, the initial values of properties (null pointers and
- * undefined values) are not reflected in the property types. These
- * values are always possible when reading the property.
+ * 3. In typed objects (but not unboxed objects), the initial values of
+ * properties (null pointers and undefined values) are not reflected in
+ * the property types. These values are always possible when reading the
+ * property.
*
* We establish these by using write barriers on calls to setProperty and
* defineProperty which are on native properties, and on any jitcode which
@@ -413,6 +455,12 @@ class ObjectGroup : public gc::TenuredCell
return &flags_;
}
+ // Get the bit pattern stored in an object's addendum when it has an
+ // original unboxed group.
+ static inline int32_t addendumOriginalUnboxedGroupValue() {
+ return Addendum_OriginalUnboxedGroup << OBJECT_FLAG_ADDENDUM_SHIFT;
+ }
+
inline uint32_t basePropertyCount();
private:
@@ -463,8 +511,8 @@ class ObjectGroup : public gc::TenuredCell
NewObjectKind newKind,
NewArrayKind arrayKind = NewArrayKind::Normal);
- // Create a PlainObject with the specified properties and a group specialized
- // for those properties.
+ // Create a PlainObject or UnboxedPlainObject with the specified properties
+ // and a group specialized for those properties.
static JSObject* newPlainObject(ExclusiveContext* cx,
IdValuePair* properties, size_t nproperties,
NewObjectKind newKind);