| /* -*- 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 jspropertytree_h |
| #define jspropertytree_h |
| |
| #include "jsalloc.h" |
| #include "jspubtd.h" |
| |
| #include "js/HashTable.h" |
| |
| namespace js { |
| |
| class Shape; |
| struct StackShape; |
| |
| struct ShapeHasher : public DefaultHasher<Shape*> { |
| typedef Shape* Key; |
| typedef StackShape Lookup; |
| |
| static inline HashNumber hash(const Lookup& l); |
| static inline bool match(Key k, const Lookup& l); |
| }; |
| |
| typedef HashSet<Shape*, ShapeHasher, SystemAllocPolicy> KidsHash; |
| |
| class KidsPointer { |
| private: |
| enum { |
| SHAPE = 0, |
| HASH = 1, |
| TAG = 1 |
| }; |
| |
| uintptr_t w; |
| |
| public: |
| bool isNull() const { return !w; } |
| void setNull() { w = 0; } |
| |
| bool isShape() const { return (w & TAG) == SHAPE && !isNull(); } |
| Shape* toShape() const { |
| MOZ_ASSERT(isShape()); |
| return reinterpret_cast<Shape*>(w & ~uintptr_t(TAG)); |
| } |
| void setShape(Shape* shape) { |
| MOZ_ASSERT(shape); |
| MOZ_ASSERT((reinterpret_cast<uintptr_t>(static_cast<Shape*>(shape)) & TAG) == 0); |
| w = reinterpret_cast<uintptr_t>(static_cast<Shape*>(shape)) | SHAPE; |
| } |
| |
| bool isHash() const { return (w & TAG) == HASH; } |
| KidsHash* toHash() const { |
| MOZ_ASSERT(isHash()); |
| return reinterpret_cast<KidsHash*>(w & ~uintptr_t(TAG)); |
| } |
| void setHash(KidsHash* hash) { |
| MOZ_ASSERT(hash); |
| MOZ_ASSERT((reinterpret_cast<uintptr_t>(hash) & TAG) == 0); |
| w = reinterpret_cast<uintptr_t>(hash) | HASH; |
| } |
| |
| #ifdef DEBUG |
| void checkConsistency(Shape* aKid) const; |
| #endif |
| }; |
| |
| class PropertyTree |
| { |
| friend class ::JSFunction; |
| |
| JSCompartment* compartment_; |
| |
| bool insertChild(ExclusiveContext* cx, Shape* parent, Shape* child); |
| |
| PropertyTree(); |
| |
| public: |
| /* |
| * Use a lower limit for objects that are accessed using SETELEM (o[x] = y). |
| * These objects are likely used as hashmaps and dictionary mode is more |
| * efficient in this case. |
| */ |
| enum { |
| MAX_HEIGHT = 512, |
| MAX_HEIGHT_WITH_ELEMENTS_ACCESS = 128 |
| }; |
| |
| explicit PropertyTree(JSCompartment* comp) |
| : compartment_(comp) |
| { |
| } |
| |
| JSCompartment* compartment() { return compartment_; } |
| |
| Shape* getChild(ExclusiveContext* cx, Shape* parent, JS::Handle<StackShape> child); |
| }; |
| |
| } /* namespace js */ |
| |
| #endif /* jspropertytree_h */ |