TemplateObject.h (2583B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- 2 * vim: set ts=8 sts=2 et sw=2 tw=80: 3 * This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 #ifndef jit_TemplateObject_h 8 #define jit_TemplateObject_h 9 10 #include "vm/NativeObject.h" 11 #include "vm/Shape.h" 12 13 namespace js { 14 namespace jit { 15 16 class TemplateNativeObject; 17 18 // Wrapper for template objects. This should only expose methods that can be 19 // safely called off-thread without racing with the main thread. 20 class TemplateObject { 21 protected: 22 JSObject* obj_; 23 24 public: 25 explicit TemplateObject(JSObject* obj) : obj_(obj) {} 26 27 inline gc::AllocKind getAllocKind() const; 28 29 // The following methods rely on the object's group->clasp. This is safe 30 // to read off-thread for template objects. 31 inline bool isNativeObject() const; 32 inline const TemplateNativeObject& asTemplateNativeObject() const; 33 inline bool isArrayObject() const; 34 inline bool isArgumentsObject() const; 35 inline bool isTypedArrayObject() const; 36 inline bool isRegExpObject() const; 37 inline bool isCallObject() const; 38 inline bool isBlockLexicalEnvironmentObject() const; 39 inline bool isPlainObject() const; 40 41 // The shape should not change. This is true for template objects because 42 // they're never exposed to arbitrary script. 43 inline gc::Cell* shape() const; 44 }; 45 46 class TemplateNativeObject : public TemplateObject { 47 protected: 48 NativeObject& asNativeObject() const { return obj_->as<NativeObject>(); } 49 50 public: 51 // Reading slot counts and object slots is safe, as long as we don't touch 52 // the BaseShape (it can change when we create a ShapeTable for the shape). 53 inline bool hasDynamicSlots() const; 54 inline uint32_t numDynamicSlots() const; 55 inline uint32_t numUsedFixedSlots() const; 56 inline uint32_t numFixedSlots() const; 57 inline uint32_t slotSpan() const; 58 inline Value getSlot(uint32_t i) const; 59 60 // Reading ObjectElements fields is safe, except for the flags. 61 // isSharedMemory is an exception: it's debug-only and not called on arrays. 62 #ifdef DEBUG 63 inline bool isSharedMemory() const; 64 #endif 65 inline uint32_t getDenseCapacity() const; 66 inline uint32_t getDenseInitializedLength() const; 67 inline uint32_t getArrayLength() const; 68 inline bool hasDynamicElements() const; 69 inline const Value* getDenseElements() const; 70 71 inline gc::Cell* regExpShared() const; 72 }; 73 74 } // namespace jit 75 } // namespace js 76 77 #endif /* jit_TemplateObject_h */