/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- * vim: set ts=8 sw=4 et tw=78: * * ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is Mozilla Communicator client code, released * March 31, 1998. * * The Initial Developer of the Original Code is * Netscape Communications Corporation. * Portions created by the Initial Developer are Copyright (C) 1998 * the Initial Developer. All Rights Reserved. * * Contributor(s): * * Alternatively, the contents of this file may be used under the terms of * either of the GNU General Public License Version 2 or later (the "GPL"), * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ #ifndef jsobj_h___ #define jsobj_h___ /* * JS object definitions. * * A JS object consists of a possibly-shared object descriptor containing * ordered property names, called the map; and a dense vector of property * values, called slots. The map/slot pointer pair is GC'ed, while the map * is reference counted and the slot vector is malloc'ed. */ #include "jsapi.h" #include "jshash.h" #include "jspubtd.h" #include "jsprvtd.h" #include "jslock.h" #include "jsvalue.h" #include "jsvector.h" #include "jscell.h" namespace js { class JSProxyHandler; class AutoPropDescArrayRooter; namespace mjit { class Compiler; } static inline PropertyOp CastAsPropertyOp(JSObject *object) { return JS_DATA_TO_FUNC_PTR(PropertyOp, object); } static inline JSPropertyOp CastAsJSPropertyOp(JSObject *object) { return JS_DATA_TO_FUNC_PTR(JSPropertyOp, object); } inline JSObject * CastAsObject(PropertyOp op) { return JS_FUNC_TO_DATA_PTR(JSObject *, op); } inline Value CastAsObjectJsval(PropertyOp op) { return ObjectOrNullValue(CastAsObject(op)); } } /* namespace js */ /* * A representation of ECMA-262 ed. 5's internal property descriptor data * structure. */ struct PropDesc { friend class js::AutoPropDescArrayRooter; PropDesc(); public: /* 8.10.5 ToPropertyDescriptor(Obj) */ bool initialize(JSContext* cx, jsid id, const js::Value &v); /* 8.10.1 IsAccessorDescriptor(desc) */ bool isAccessorDescriptor() const { return hasGet || hasSet; } /* 8.10.2 IsDataDescriptor(desc) */ bool isDataDescriptor() const { return hasValue || hasWritable; } /* 8.10.3 IsGenericDescriptor(desc) */ bool isGenericDescriptor() const { return !isAccessorDescriptor() && !isDataDescriptor(); } bool configurable() const { return (attrs & JSPROP_PERMANENT) == 0; } bool enumerable() const { return (attrs & JSPROP_ENUMERATE) != 0; } bool writable() const { return (attrs & JSPROP_READONLY) == 0; } JSObject* getterObject() const { return get.isUndefined() ? NULL : &get.toObject(); } JSObject* setterObject() const { return set.isUndefined() ? NULL : &set.toObject(); } const js::Value &getterValue() const { return get; } const js::Value &setterValue() const { return set; } js::PropertyOp getter() const { return js::CastAsPropertyOp(getterObject()); } js::PropertyOp setter() const { return js::CastAsPropertyOp(setterObject()); } js::Value pd; jsid id; js::Value value, get, set; /* Property descriptor boolean fields. */ uint8 attrs; /* Bits indicating which values are set. */ bool hasGet : 1; bool hasSet : 1; bool hasValue : 1; bool hasWritable : 1; bool hasEnumerable : 1; bool hasConfigurable : 1; }; namespace js { typedef Vector PropDescArray; } /* namespace js */ struct JSObjectMap { static JS_FRIEND_DATA(const JSObjectMap) sharedNonNative; uint32 shape; /* shape identifier */ uint32 slotSpan; /* one more than maximum live slot number */ explicit JSObjectMap(uint32 shape) : shape(shape), slotSpan(0) {} JSObjectMap(uint32 shape, uint32 slotSpan) : shape(shape), slotSpan(slotSpan) {} enum { INVALID_SHAPE = 0x8fffffff, SHAPELESS = 0xffffffff }; bool isNative() const { return this != &sharedNonNative; } private: /* No copy or assignment semantics. */ JSObjectMap(JSObjectMap &); void operator=(JSObjectMap &); }; /* * Unlike js_DefineNativeProperty, propp must be non-null. On success, and if * id was found, return true with *objp non-null and locked, and with a held * property stored in *propp. If successful but id was not found, return true * with both *objp and *propp null. Therefore all callers who receive a * non-null *propp must later call (*objp)->dropProperty(cx, *propp). */ extern JS_FRIEND_API(JSBool) js_LookupProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp, JSProperty **propp); extern JSBool js_DefineProperty(JSContext *cx, JSObject *obj, jsid id, const js::Value *value, js::PropertyOp getter, js::PropertyOp setter, uintN attrs); extern JSBool js_GetProperty(JSContext *cx, JSObject *obj, jsid id, js::Value *vp); extern JSBool js_SetProperty(JSContext *cx, JSObject *obj, jsid id, js::Value *vp, JSBool strict); extern JSBool js_GetAttributes(JSContext *cx, JSObject *obj, jsid id, uintN *attrsp); extern JSBool js_SetAttributes(JSContext *cx, JSObject *obj, jsid id, uintN *attrsp); extern JSBool js_DeleteProperty(JSContext *cx, JSObject *obj, jsid id, js::Value *rval, JSBool strict); extern JS_FRIEND_API(JSBool) js_Enumerate(JSContext *cx, JSObject *obj, JSIterateOp enum_op, js::Value *statep, jsid *idp); extern JSType js_TypeOf(JSContext *cx, JSObject *obj); struct NativeIterator; const uint32 JS_INITIAL_NSLOTS = 3; /* * The first available slot to store generic value. For JSCLASS_HAS_PRIVATE * classes the slot stores a pointer to private data stuffed in a Value. * Such pointer is stored as is without an overhead of PRIVATE_TO_JSVAL * tagging and should be accessed using the (get|set)Private methods of * JSObject. */ const uint32 JSSLOT_PRIVATE = 0; struct JSFunction; /* * JSObject struct, with members sized to fit in 32 bytes on 32-bit targets, * 64 bytes on 64-bit systems. The JSFunction struct is an extension of this * struct allocated from a larger GC size-class. * * The clasp member stores the js::Class pointer for this object. We do *not* * synchronize updates of clasp or flags -- API clients must take care. * * An object is a delegate if it is on another object's prototype (the proto * field) or scope chain (the parent field), and therefore the delegate might * be asked implicitly to get or set a property on behalf of another object. * Delegates may be accessed directly too, as may any object, but only those * objects linked after the head of any prototype or scope chain are flagged * as delegates. This definition helps to optimize shape-based property cache * invalidation (see Purge{Scope,Proto}Chain in jsobj.cpp). * * The meaning of the system object bit is defined by the API client. It is * set in JS_NewSystemObject and is queried by JS_IsSystemObject (jsdbgapi.h), * but it has no intrinsic meaning to SpiderMonkey. Further, JSFILENAME_SYSTEM * and JS_FlagScriptFilenamePrefix (also exported via jsdbgapi.h) are intended * to be complementary to this bit, but it is up to the API client to implement * any such association. * * Both these flag bits are initially zero; they may be set or queried using * the (is|set)(Delegate|System) inline methods. * * The dslots member is null or a pointer into a dynamically allocated vector * of Values for reserved and dynamic slots. If dslots is not null, dslots[-1] * records the number of available slots. */ struct JSObject : js::gc::Cell { /* * TraceRecorder must be a friend because it generates code that * manipulates JSObjects, which requires peeking under any encapsulation. */ friend class js::TraceRecorder; /* * Private pointer to the last added property and methods to manipulate the * list it links among properties in this scope. The {remove,insert} pair * for DictionaryProperties assert that the scope is in dictionary mode and * any reachable properties are flagged as dictionary properties. * * NB: these private methods do *not* update this scope's shape to track * lastProp->shape after they finish updating the linked list in the case * where lastProp is updated. It is up to calling code in jsscope.cpp to * call updateShape(cx) after updating lastProp. */ union { js::Shape *lastProp; JSObjectMap *map; }; js::Class *clasp; private: inline void setLastProperty(const js::Shape *shape); inline void removeLastProperty(); #ifdef DEBUG void checkShapeConsistency(); #endif public: inline const js::Shape *lastProperty() const; inline js::Shape **nativeSearch(jsid id, bool adding = false); inline const js::Shape *nativeLookup(jsid id); inline bool nativeContains(jsid id); inline bool nativeContains(const js::Shape &shape); enum { DELEGATE = 0x01, SYSTEM = 0x02, NOT_EXTENSIBLE = 0x04, BRANDED = 0x08, GENERIC = 0x10, METHOD_BARRIER = 0x20, INDEXED = 0x40, OWN_SHAPE = 0x80, BOUND_FUNCTION = 0x100 }; /* * Impose a sane upper bound, originally checked only for dense arrays, on * number of slots in an object. */ enum { NSLOTS_BITS = 29, NSLOTS_LIMIT = JS_BIT(NSLOTS_BITS) }; uint32 flags; /* flags */ uint32 objShape; /* copy of lastProp->shape, or override if different */ JSObject *proto; /* object's prototype */ JSObject *parent; /* object's parent */ js::Value *dslots; /* dynamically allocated slots */ /* Empty shape of kids if prototype, located here to align fslots on 32 bit targets. */ js::EmptyShape *emptyShape; js::Value fslots[JS_INITIAL_NSLOTS]; /* small number of fixed slots */ #ifdef JS_THREADSAFE JSTitle title; #endif /* * Return an immutable, shareable, empty shape with the same clasp as this * and the same slotSpan as this had when empty. * * If |this| is the scope of an object |proto|, the resulting scope can be * used as the scope of a new object whose prototype is |proto|. */ inline bool canProvideEmptyShape(js::Class *clasp); inline js::EmptyShape *getEmptyShape(JSContext *cx, js::Class *aclasp); bool isNative() const { return map->isNative(); } js::Class *getClass() const { return clasp; } JSClass *getJSClass() const { return Jsvalify(clasp); } bool hasClass(const js::Class *c) const { return c == clasp; } const js::ObjectOps *getOps() const { return &getClass()->ops; } inline void trace(JSTracer *trc); uint32 shape() const { JS_ASSERT(objShape != JSObjectMap::INVALID_SHAPE); return objShape; } bool isDelegate() const { return !!(flags & DELEGATE); } void setDelegate() { flags |= DELEGATE; } bool isBoundFunction() const { return !!(flags & BOUND_FUNCTION); } static void setDelegateNullSafe(JSObject *obj) { if (obj) obj->setDelegate(); } bool isSystem() const { return !!(flags & SYSTEM); } void setSystem() { flags |= SYSTEM; } /* * A branded object contains plain old methods (function-valued properties * without magic getters and setters), and its shape evolves whenever a * function value changes. */ bool branded() { return !!(flags & BRANDED); } bool brand(JSContext *cx, uint32 slot, js::Value v); bool unbrand(JSContext *cx); bool generic() { return !!(flags & GENERIC); } void setGeneric() { flags |= GENERIC; } private: void generateOwnShape(JSContext *cx); void setOwnShape(uint32 s) { flags |= OWN_SHAPE; objShape = s; } void clearOwnShape() { flags &= ~OWN_SHAPE; objShape = map->shape; } public: inline bool nativeEmpty() const; bool hasOwnShape() const { return !!(flags & OWN_SHAPE); } void setMap(JSObjectMap *amap) { JS_ASSERT(!hasOwnShape()); map = amap; objShape = map->shape; } void setSharedNonNativeMap() { setMap(const_cast(&JSObjectMap::sharedNonNative)); } void deletingShapeChange(JSContext *cx, const js::Shape &shape); bool methodShapeChange(JSContext *cx, const js::Shape &shape); bool methodShapeChange(JSContext *cx, uint32 slot); void protoShapeChange(JSContext *cx); void shadowingShapeChange(JSContext *cx, const js::Shape &shape); bool globalObjectOwnShapeChange(JSContext *cx); void extensibleShapeChange(JSContext *cx) { /* This will do for now. */ generateOwnShape(cx); } /* * A scope has a method barrier when some compiler-created "null closure" * function objects (functions that do not use lexical bindings above their * scope, only free variable names) that have a correct JSSLOT_PARENT value * thanks to the COMPILE_N_GO optimization are stored as newly added direct * property values of the scope's object. * * The de-facto standard JS language requires each evaluation of such a * closure to result in a unique (according to === and observable effects) * function object. ES3 tried to allow implementations to "join" such * objects to a single compiler-created object, but this makes an overt * mutation hazard, also an "identity hazard" against interoperation among * implementations that join and do not join. * * To stay compatible with the de-facto standard, we store the compiler- * created function object as the method value and set the METHOD_BARRIER * flag. * * The method value is part of the method property tree node's identity, so * it effectively brands the scope with a predictable shape corresponding * to the method value, but without the overhead of setting the BRANDED * flag, which requires assigning a new shape peculiar to each branded * scope. Instead the shape is shared via the property tree among all the * scopes referencing the method property tree node. * * Then when reading from a scope for which scope->hasMethodBarrier() is * true, we count on the scope's qualified/guarded shape being unique and * add a read barrier that clones the compiler-created function object on * demand, reshaping the scope. * * This read barrier is bypassed when evaluating the callee sub-expression * of a call expression (see the JOF_CALLOP opcodes in jsopcode.tbl), since * such ops do not present an identity or mutation hazard. The compiler * performs this optimization only for null closures that do not use their * own name or equivalent built-in references (arguments.callee). * * The BRANDED write barrier, JSObject::methodWriteBarrer, must check for * METHOD_BARRIER too, and regenerate this scope's shape if the method's * value is in fact changing. */ bool hasMethodBarrier() { return !!(flags & METHOD_BARRIER); } void setMethodBarrier() { flags |= METHOD_BARRIER; } /* * Test whether this object may be branded due to method calls, which means * any assignment to a function-valued property must regenerate shape; else * test whether this object has method properties, which require a method * write barrier. */ bool brandedOrHasMethodBarrier() { return !!(flags & (BRANDED | METHOD_BARRIER)); } /* * Read barrier to clone a joined function object stored as a method. * Defined in jsobjinlines.h, but not declared inline per standard style in * order to avoid gcc warnings. */ bool methodReadBarrier(JSContext *cx, const js::Shape &shape, js::Value *vp); /* * Write barrier to check for a change of method value. Defined inline in * jsobjinlines.h after methodReadBarrier. The slot flavor is required by * JSOP_*GVAR, which deals in slots not shapes, while not deoptimizing to * map slot to shape unless JSObject::flags show that this is necessary. * The methodShapeChange overload (directly below) parallels this. */ bool methodWriteBarrier(JSContext *cx, const js::Shape &shape, const js::Value &v); bool methodWriteBarrier(JSContext *cx, uint32 slot, const js::Value &v); bool isIndexed() const { return !!(flags & INDEXED); } void setIndexed() { flags |= INDEXED; } /* * Return true if this object is a native one that has been converted from * shared-immutable prototype-rooted shape storage to dictionary-shapes in * a doubly-linked list. */ inline bool inDictionaryMode() const; inline uint32 propertyCount() const; inline bool hasPropertyTable() const; uint32 numSlots(void) const { return dslots ? dslots[-1].toPrivateUint32() : uint32(JS_INITIAL_NSLOTS); } size_t slotsAndStructSize(uint32 nslots) const; size_t slotsAndStructSize() const { return slotsAndStructSize(numSlots()); } private: static size_t slotsToDynamicWords(size_t nslots) { JS_ASSERT(nslots > JS_INITIAL_NSLOTS); return nslots + 1 - JS_INITIAL_NSLOTS; } static size_t dynamicWordsToSlots(size_t nwords) { JS_ASSERT(nwords > 1); return nwords - 1 + JS_INITIAL_NSLOTS; } public: bool allocSlots(JSContext *cx, size_t nslots); bool growSlots(JSContext *cx, size_t nslots); void shrinkSlots(JSContext *cx, size_t nslots); /* * Ensure that the object has at least JSCLASS_RESERVED_SLOTS(clasp) + * nreserved slots. * * This method may be called only for native objects freshly created using * NewObject or one of its variant where the new object will both (a) never * escape to script and (b) never be extended with ad-hoc properties that * would try to allocate higher slots without the fresh object first having * its map set to a shape path that maps those slots. * * Block objects satisfy (a) and (b), as there is no evil eval-based way to * add ad-hoc properties to a Block instance. Call objects satisfy (a) and * (b) as well, because the compiler-created Shape path that covers args, * vars, and upvars, stored in their callee function in u.i.names, becomes * their initial map. */ bool ensureInstanceReservedSlots(JSContext *cx, size_t nreserved); /* * NB: ensureClassReservedSlotsForEmptyObject asserts that nativeEmpty() * Use ensureClassReservedSlots for any object, either empty or already * extended with properties. */ bool ensureClassReservedSlotsForEmptyObject(JSContext *cx); inline bool ensureClassReservedSlots(JSContext *cx); uint32 slotSpan() const { return map->slotSpan; } bool containsSlot(uint32 slot) const { return slot < slotSpan(); } js::Value& getSlotRef(uintN slot) { return (slot < JS_INITIAL_NSLOTS) ? fslots[slot] : (JS_ASSERT(slot < dslots[-1].toPrivateUint32()), dslots[slot - JS_INITIAL_NSLOTS]); } const js::Value &getSlot(uintN slot) const { return (slot < JS_INITIAL_NSLOTS) ? fslots[slot] : (JS_ASSERT(slot < dslots[-1].toPrivateUint32()), dslots[slot - JS_INITIAL_NSLOTS]); } void setSlot(uintN slot, const js::Value &value) { if (slot < JS_INITIAL_NSLOTS) { fslots[slot] = value; } else { JS_ASSERT(slot < dslots[-1].toPrivateUint32()); dslots[slot - JS_INITIAL_NSLOTS] = value; } } inline const js::Value &lockedGetSlot(uintN slot) const; inline void lockedSetSlot(uintN slot, const js::Value &value); /* * These ones are for multi-threaded ("MT") objects. Use getSlot(), * getSlotRef(), setSlot() to directly manipulate slots in obj when only * one thread can access obj, or when accessing read-only slots within * JS_INITIAL_NSLOTS. */ inline js::Value getSlotMT(JSContext *cx, uintN slot); inline void setSlotMT(JSContext *cx, uintN slot, const js::Value &value); inline js::Value getReservedSlot(uintN index) const; /* Defined in jsscopeinlines.h to avoid including implementation dependencies here. */ inline void updateShape(JSContext *cx); inline void updateFlags(const js::Shape *shape, bool isDefinitelyAtom = false); /* Extend this object to have shape as its last-added property. */ inline void extend(JSContext *cx, const js::Shape *shape, bool isDefinitelyAtom = false); JSObject *getProto() const { return proto; } void clearProto() { proto = NULL; } void setProto(JSObject *newProto) { #ifdef DEBUG for (JSObject *obj = newProto; obj; obj = obj->getProto()) JS_ASSERT(obj != this); #endif setDelegateNullSafe(newProto); proto = newProto; } JSObject *getParent() const { return parent; } void clearParent() { parent = NULL; } void setParent(JSObject *newParent) { #ifdef DEBUG for (JSObject *obj = newParent; obj; obj = obj->getParent()) JS_ASSERT(obj != this); #endif setDelegateNullSafe(newParent); parent = newParent; } JSObject *getGlobal() const; bool isGlobal() const { return !!(getClass()->flags & JSCLASS_IS_GLOBAL); } void *getPrivate() const { JS_ASSERT(getClass()->flags & JSCLASS_HAS_PRIVATE); return *(void **)&fslots[JSSLOT_PRIVATE]; } void setPrivate(void *data) { JS_ASSERT(getClass()->flags & JSCLASS_HAS_PRIVATE); *(void **)&fslots[JSSLOT_PRIVATE] = data; } /* * ES5 meta-object properties and operations. */ private: /* * The guts of Object.seal (ES5 15.2.3.8) and Object.freeze (ES5 15.2.3.9): mark the * object as non-extensible, and adjust each property's attributes appropriately: each * property becomes non-configurable, and if |freeze|, data properties become * read-only as well. */ bool sealOrFreeze(JSContext *cx, bool freeze = false); public: bool isExtensible() const { return !(flags & NOT_EXTENSIBLE); } bool preventExtensions(JSContext *cx, js::AutoIdVector *props); /* ES5 15.2.3.8: non-extensible, all props non-configurable */ inline bool seal(JSContext *cx) { return sealOrFreeze(cx); } /* ES5 15.2.3.9: non-extensible, all properties non-configurable, all data props read-only */ bool freeze(JSContext *cx) { return sealOrFreeze(cx, true); } /* * Primitive-specific getters and setters. */ private: static const uint32 JSSLOT_PRIMITIVE_THIS = JSSLOT_PRIVATE; public: inline const js::Value &getPrimitiveThis() const; inline void setPrimitiveThis(const js::Value &pthis); /* * Array-specific getters and setters (for both dense and slow arrays). */ // Used by dense and slow arrays. static const uint32 JSSLOT_ARRAY_LENGTH = JSSLOT_PRIVATE; static const uint32 JSSLOT_DENSE_ARRAY_CAPACITY = JSSLOT_PRIVATE + 1; // This assertion must remain true; see comment in js_MakeArraySlow(). // (Nb: This method is never called, it just contains a static assertion. // The static assertion isn't inline because that doesn't work on Mac.) inline void staticAssertArrayLengthIsInPrivateSlot(); public: static const uint32 DENSE_ARRAY_CLASS_RESERVED_SLOTS = 3; inline uint32 getArrayLength() const; inline void setArrayLength(uint32 length); inline uint32 getDenseArrayCapacity() const; inline void setDenseArrayCapacity(uint32 capacity); inline const js::Value &getDenseArrayElement(uint32 i) const; inline js::Value *addressOfDenseArrayElement(uint32 i); inline void setDenseArrayElement(uint32 i, const js::Value &v); inline js::Value *getDenseArrayElements() const; // returns pointer to the Array's elements array bool growDenseArrayElements(JSContext *cx, uint32 oldcap, uint32 newcap); bool ensureDenseArrayElements(JSContext *cx, uint32 newcap); bool shrinkDenseArrayElements(JSContext *cx, uint32 newcap); inline void freeDenseArrayElements(JSContext *cx); inline void voidDenseOnlyArraySlots(); // used when converting a dense array to a slow array JSBool makeDenseArraySlow(JSContext *cx); /* * Arguments-specific getters and setters. */ private: /* * Reserved slot structure for Arguments objects: * * JSSLOT_PRIVATE - the function's stack frame until the function * returns; also, JS_ARGUMENTS_OBJECT_ON_TRACE if * arguments was created on trace * JSSLOT_ARGS_LENGTH - the number of actual arguments and a flag * indicating whether arguments.length was * overwritten. This slot is not used to represent * arguments.length after that property has been * assigned, even if the new value is integral: it's * always the original length. * JSSLOT_ARGS_DATA - pointer to an ArgumentsData structure containing * the arguments.callee value or JSVAL_HOLE if that * was overwritten, and the values of all arguments * once the function has returned (or as soon as a * strict arguments object has been created). * * Argument index i is stored in ArgumentsData.slots[i], accessible via * {get,set}ArgsElement(). */ static const uint32 JSSLOT_ARGS_DATA = JSSLOT_PRIVATE + 2; public: /* Number of extra fixed arguments object slots besides JSSLOT_PRIVATE. */ static const uint32 JSSLOT_ARGS_LENGTH = JSSLOT_PRIVATE + 1; static const uint32 ARGS_CLASS_RESERVED_SLOTS = 2; static const uint32 ARGS_FIRST_FREE_SLOT = JSSLOT_PRIVATE + ARGS_CLASS_RESERVED_SLOTS + 1; /* Lower-order bit stolen from the length slot. */ static const uint32 ARGS_LENGTH_OVERRIDDEN_BIT = 0x1; static const uint32 ARGS_PACKED_BITS_COUNT = 1; /* * Set the initial length of the arguments, and mark it as not overridden. */ inline void setArgsLength(uint32 argc); /* * Return the initial length of the arguments. This may differ from the * current value of arguments.length! */ inline uint32 getArgsInitialLength() const; inline void setArgsLengthOverridden(); inline bool isArgsLengthOverridden() const; inline js::ArgumentsData *getArgsData() const; inline void setArgsData(js::ArgumentsData *data); inline const js::Value &getArgsCallee() const; inline void setArgsCallee(const js::Value &callee); inline const js::Value &getArgsElement(uint32 i) const; inline js::Value *addressOfArgsElement(uint32 i) const; inline void setArgsElement(uint32 i, const js::Value &v); private: /* * Reserved slot structure for Arguments objects: * */ static const uint32 JSSLOT_CALL_CALLEE = JSSLOT_PRIVATE + 1; static const uint32 JSSLOT_CALL_ARGUMENTS = JSSLOT_PRIVATE + 2; public: /* Number of extra fixed slots besides JSSLOT_PRIVATE. */ static const uint32 CALL_RESERVED_SLOTS = 2; inline JSObject &getCallObjCallee() const; inline JSFunction *getCallObjCalleeFunction() const; inline void setCallObjCallee(JSObject &callee); inline const js::Value &getCallObjArguments() const; inline void setCallObjArguments(const js::Value &v); /* * Date-specific getters and setters. */ static const uint32 JSSLOT_DATE_UTC_TIME = JSSLOT_PRIVATE; /* * Cached slots holding local properties of the date. * These are undefined until the first actual lookup occurs * and are reset to undefined whenever the date's time is modified. */ static const uint32 JSSLOT_DATE_COMPONENTS_START = JSSLOT_PRIVATE + 1; static const uint32 JSSLOT_DATE_LOCAL_TIME = JSSLOT_PRIVATE + 1; static const uint32 JSSLOT_DATE_LOCAL_YEAR = JSSLOT_PRIVATE + 2; static const uint32 JSSLOT_DATE_LOCAL_MONTH = JSSLOT_PRIVATE + 3; static const uint32 JSSLOT_DATE_LOCAL_DATE = JSSLOT_PRIVATE + 4; static const uint32 JSSLOT_DATE_LOCAL_DAY = JSSLOT_PRIVATE + 5; static const uint32 JSSLOT_DATE_LOCAL_HOURS = JSSLOT_PRIVATE + 6; static const uint32 JSSLOT_DATE_LOCAL_MINUTES = JSSLOT_PRIVATE + 7; static const uint32 JSSLOT_DATE_LOCAL_SECONDS = JSSLOT_PRIVATE + 8; static const uint32 DATE_CLASS_RESERVED_SLOTS = 9; inline const js::Value &getDateUTCTime() const; inline void setDateUTCTime(const js::Value &pthis); /* * Function-specific getters and setters. */ private: friend struct JSFunction; friend class js::mjit::Compiler; /* * Flat closures with one or more upvars snapshot the upvars' values into a * vector of js::Values referenced from this slot. */ static const uint32 JSSLOT_FLAT_CLOSURE_UPVARS = JSSLOT_PRIVATE + 1; /* * Null closures set or initialized as methods have these slots. See the * "method barrier" comments and methods. */ static const uint32 JSSLOT_FUN_METHOD_ATOM = JSSLOT_PRIVATE + 1; static const uint32 JSSLOT_FUN_METHOD_OBJ = JSSLOT_PRIVATE + 2; static const uint32 JSSLOT_BOUND_FUNCTION_THIS = JSSLOT_PRIVATE + 1; static const uint32 JSSLOT_BOUND_FUNCTION_ARGS_COUNT = JSSLOT_PRIVATE + 2; public: static const uint32 FUN_CLASS_RESERVED_SLOTS = 2; inline JSFunction *getFunctionPrivate() const; inline js::Value *getFlatClosureUpvars() const; inline js::Value getFlatClosureUpvar(uint32 i) const; inline void setFlatClosureUpvars(js::Value *upvars); inline bool hasMethodObj(const JSObject& obj) const; inline void setMethodObj(JSObject& obj); inline bool initBoundFunction(JSContext *cx, const js::Value &thisArg, const js::Value *args, uintN argslen); inline JSObject *getBoundFunctionTarget() const; inline const js::Value &getBoundFunctionThis() const; inline const js::Value *getBoundFunctionArguments(uintN &argslen) const; /* * RegExp-specific getters and setters. */ private: static const uint32 JSSLOT_REGEXP_LAST_INDEX = JSSLOT_PRIVATE + 1; public: static const uint32 REGEXP_CLASS_RESERVED_SLOTS = 1; inline const js::Value &getRegExpLastIndex() const; inline void setRegExpLastIndex(const js::Value &v); inline void setRegExpLastIndex(jsdouble d); inline void zeroRegExpLastIndex(); /* * Iterator-specific getters and setters. */ inline NativeIterator *getNativeIterator() const; inline void setNativeIterator(NativeIterator *); /* * XML-related getters and setters. */ /* * Slots for XML-related classes are as follows: * - js_NamespaceClass.base reserves the *_NAME_* and *_NAMESPACE_* slots. * - js_QNameClass.base, js_AttributeNameClass, js_AnyNameClass reserve * the *_NAME_* and *_QNAME_* slots. * - Others (js_XMLClass, js_XMLFilterClass) don't reserve any slots. */ private: static const uint32 JSSLOT_NAME_PREFIX = JSSLOT_PRIVATE; // shared static const uint32 JSSLOT_NAME_URI = JSSLOT_PRIVATE + 1; // shared static const uint32 JSSLOT_NAMESPACE_DECLARED = JSSLOT_PRIVATE + 2; static const uint32 JSSLOT_QNAME_LOCAL_NAME = JSSLOT_PRIVATE + 2; public: static const uint32 NAMESPACE_CLASS_RESERVED_SLOTS = 3; static const uint32 QNAME_CLASS_RESERVED_SLOTS = 3; inline jsval getNamePrefix() const; inline void setNamePrefix(jsval prefix); inline jsval getNameURI() const; inline void setNameURI(jsval uri); inline jsval getNamespaceDeclared() const; inline void setNamespaceDeclared(jsval decl); inline jsval getQNameLocalName() const; inline void setQNameLocalName(jsval decl); /* * Proxy-specific getters and setters. */ inline js::JSProxyHandler *getProxyHandler() const; inline const js::Value &getProxyPrivate() const; inline void setProxyPrivate(const js::Value &priv); /* * With object-specific getters and setters. */ inline JSObject *getWithThis() const; inline void setWithThis(JSObject *thisp); /* * Back to generic stuff. */ inline bool isCallable(); /* The map field is not initialized here and should be set separately. */ inline void initCommon(js::Class *aclasp, JSObject *proto, JSObject *parent, JSContext *cx); inline void init(js::Class *aclasp, JSObject *proto, JSObject *parent, JSContext *cx); inline void init(js::Class *aclasp, JSObject *proto, JSObject *parent, void *priv, JSContext *cx); inline void init(js::Class *aclasp, JSObject *proto, JSObject *parent, const js::Value &privateSlotValue, JSContext *cx); inline void finish(JSContext *cx); JS_ALWAYS_INLINE void finalize(JSContext *cx, unsigned thindKind); /* * Like init, but also initializes map. The catch: proto must be the result * of a call to js_InitClass(...clasp, ...). */ inline void initSharingEmptyShape(js::Class *clasp, JSObject *proto, JSObject *parent, const js::Value &privateSlotValue, JSContext *cx); inline void initSharingEmptyShape(js::Class *clasp, JSObject *proto, JSObject *parent, void *priv, JSContext *cx); inline bool hasSlotsArray() const { return !!dslots; } /* This method can only be called when hasSlotsArray() returns true. */ inline void freeSlotsArray(JSContext *cx); inline bool hasProperty(JSContext *cx, jsid id, bool *foundp, uintN flags = 0); bool allocSlot(JSContext *cx, uint32 *slotp); void freeSlot(JSContext *cx, uint32 slot); bool reportReadOnly(JSContext* cx, jsid id, uintN report = JSREPORT_ERROR); bool reportNotConfigurable(JSContext* cx, jsid id, uintN report = JSREPORT_ERROR); bool reportNotExtensible(JSContext *cx, uintN report = JSREPORT_ERROR); private: js::Shape *getChildProperty(JSContext *cx, js::Shape *parent, js::Shape &child); /* * Internal helper that adds a shape not yet mapped by this object. * * Notes: * 1. getter and setter must be normalized based on flags (see jsscope.cpp). * 2. !isExtensible() checking must be done by callers. */ const js::Shape *addPropertyInternal(JSContext *cx, jsid id, js::PropertyOp getter, js::PropertyOp setter, uint32 slot, uintN attrs, uintN flags, intN shortid, js::Shape **spp); bool toDictionaryMode(JSContext *cx); public: /* Add a property whose id is not yet in this scope. */ const js::Shape *addProperty(JSContext *cx, jsid id, js::PropertyOp getter, js::PropertyOp setter, uint32 slot, uintN attrs, uintN flags, intN shortid); /* Add a data property whose id is not yet in this scope. */ const js::Shape *addDataProperty(JSContext *cx, jsid id, uint32 slot, uintN attrs) { JS_ASSERT(!(attrs & (JSPROP_GETTER | JSPROP_SETTER))); return addProperty(cx, id, NULL, NULL, slot, attrs, 0, 0); } /* Add or overwrite a property for id in this scope. */ const js::Shape *putProperty(JSContext *cx, jsid id, js::PropertyOp getter, js::PropertyOp setter, uint32 slot, uintN attrs, uintN flags, intN shortid); /* Change the given property into a sibling with the same id in this scope. */ const js::Shape *changeProperty(JSContext *cx, const js::Shape *shape, uintN attrs, uintN mask, js::PropertyOp getter, js::PropertyOp setter); /* Remove the property named by id from this object. */ bool removeProperty(JSContext *cx, jsid id); /* Clear the scope, making it empty. */ void clear(JSContext *cx); JSBool lookupProperty(JSContext *cx, jsid id, JSObject **objp, JSProperty **propp) { js::LookupPropOp op = getOps()->lookupProperty; return (op ? op : js_LookupProperty)(cx, this, id, objp, propp); } JSBool defineProperty(JSContext *cx, jsid id, const js::Value &value, js::PropertyOp getter = js::PropertyStub, js::PropertyOp setter = js::PropertyStub, uintN attrs = JSPROP_ENUMERATE) { js::DefinePropOp op = getOps()->defineProperty; return (op ? op : js_DefineProperty)(cx, this, id, &value, getter, setter, attrs); } JSBool getProperty(JSContext *cx, jsid id, js::Value *vp) { js::PropertyIdOp op = getOps()->getProperty; return (op ? op : js_GetProperty)(cx, this, id, vp); } JSBool setProperty(JSContext *cx, jsid id, js::Value *vp, JSBool strict) { js::StrictPropertyIdOp op = getOps()->setProperty; return (op ? op : js_SetProperty)(cx, this, id, vp, strict); } JSBool getAttributes(JSContext *cx, jsid id, uintN *attrsp) { js::AttributesOp op = getOps()->getAttributes; return (op ? op : js_GetAttributes)(cx, this, id, attrsp); } JSBool setAttributes(JSContext *cx, jsid id, uintN *attrsp) { js::AttributesOp op = getOps()->setAttributes; return (op ? op : js_SetAttributes)(cx, this, id, attrsp); } JSBool deleteProperty(JSContext *cx, jsid id, js::Value *rval, JSBool strict) { js::StrictPropertyIdOp op = getOps()->deleteProperty; return (op ? op : js_DeleteProperty)(cx, this, id, rval, strict); } JSBool enumerate(JSContext *cx, JSIterateOp iterop, js::Value *statep, jsid *idp) { js::NewEnumerateOp op = getOps()->enumerate; return (op ? op : js_Enumerate)(cx, this, iterop, statep, idp); } JSType typeOf(JSContext *cx) { js::TypeOfOp op = getOps()->typeOf; return (op ? op : js_TypeOf)(cx, this); } JSObject *wrappedObject(JSContext *cx) const; /* These four are time-optimized to avoid stub calls. */ JSObject *thisObject(JSContext *cx) { JSObjectOp op = getOps()->thisObject; return op ? op(cx, this) : this; } static bool thisObject(JSContext *cx, const js::Value &v, js::Value *vp); inline void dropProperty(JSContext *cx, JSProperty *prop); JS_FRIEND_API(JSCompartment *) getCompartment(JSContext *cx); inline JSObject *getThrowTypeError() const; const js::Shape *defineBlockVariable(JSContext *cx, jsid id, intN index); void swap(JSObject *obj); inline bool canHaveMethodBarrier() const; inline bool isArguments() const; inline bool isNormalArguments() const; inline bool isStrictArguments() const; inline bool isArray() const; inline bool isDenseArray() const; inline bool isSlowArray() const; inline bool isNumber() const; inline bool isBoolean() const; inline bool isString() const; inline bool isPrimitive() const; inline bool isDate() const; inline bool isFunction() const; inline bool isObject() const; inline bool isWith() const; inline bool isBlock() const; inline bool isStaticBlock() const; inline bool isClonedBlock() const; inline bool isCall() const; inline bool isRegExp() const; inline bool isXML() const; inline bool isXMLId() const; inline bool isNamespace() const; inline bool isQName() const; inline bool isProxy() const; inline bool isObjectProxy() const; inline bool isFunctionProxy() const; JS_FRIEND_API(bool) isWrapper() const; JS_FRIEND_API(JSObject *) unwrap(uintN *flagsp = NULL); inline void initArrayClass(); }; JS_STATIC_ASSERT(offsetof(JSObject, fslots) % sizeof(js::Value) == 0); #define JSSLOT_START(clasp) (((clasp)->flags & JSCLASS_HAS_PRIVATE) \ ? JSSLOT_PRIVATE + 1 \ : JSSLOT_PRIVATE) #define JSSLOT_FREE(clasp) (JSSLOT_START(clasp) \ + JSCLASS_RESERVED_SLOTS(clasp)) /* * Maximum capacity of the obj->dslots vector, net of the hidden slot at * obj->dslots[-1] that is used to store the length of the vector biased by * JS_INITIAL_NSLOTS (and again net of the slot at index -1). */ #define MAX_DSLOTS_LENGTH (~size_t(0) / sizeof(js::Value) - 1) #define MAX_DSLOTS_LENGTH32 (~uint32(0) / sizeof(js::Value) - 1) #define OBJ_CHECK_SLOT(obj,slot) JS_ASSERT((obj)->containsSlot(slot)) #ifdef JS_THREADSAFE /* * The GC runs only when all threads except the one on which the GC is active * are suspended at GC-safe points, so calling obj->getSlot() from the GC's * thread is safe when rt->gcRunning is set. See jsgc.cpp for details. */ #define THREAD_IS_RUNNING_GC(rt, thread) \ ((rt)->gcRunning && (rt)->gcThread == (thread)) #define CX_THREAD_IS_RUNNING_GC(cx) \ THREAD_IS_RUNNING_GC((cx)->runtime, (cx)->thread) #endif /* JS_THREADSAFE */ inline void OBJ_TO_INNER_OBJECT(JSContext *cx, JSObject *&obj) { if (JSObjectOp op = obj->getClass()->ext.innerObject) obj = op(cx, obj); } inline void OBJ_TO_OUTER_OBJECT(JSContext *cx, JSObject *&obj) { if (JSObjectOp op = obj->getClass()->ext.outerObject) obj = op(cx, obj); } class JSValueArray { public: jsval *array; size_t length; JSValueArray(jsval *v, size_t c) : array(v), length(c) {} }; class ValueArray { public: js::Value *array; size_t length; ValueArray(js::Value *v, size_t c) : array(v), length(c) {} }; extern js::Class js_ObjectClass; extern js::Class js_WithClass; extern js::Class js_BlockClass; inline bool JSObject::isObject() const { return getClass() == &js_ObjectClass; } inline bool JSObject::isWith() const { return getClass() == &js_WithClass; } inline bool JSObject::isBlock() const { return getClass() == &js_BlockClass; } /* * Block scope object macros. The slots reserved by js_BlockClass are: * * JSSLOT_PRIVATE JSStackFrame * active frame pointer or null * JSSLOT_BLOCK_DEPTH int depth of block slots in frame * * After JSSLOT_BLOCK_DEPTH come one or more slots for the block locals. * * A With object is like a Block object, in that both have one reserved slot * telling the stack depth of the relevant slots (the slot whose value is the * object named in the with statement, the slots containing the block's local * variables); and both have a private slot referring to the JSStackFrame in * whose activation they were created (or null if the with or block object * outlives the frame). */ static const uint32 JSSLOT_BLOCK_DEPTH = JSSLOT_PRIVATE + 1; static const uint32 JSSLOT_BLOCK_FIRST_FREE_SLOT = JSSLOT_BLOCK_DEPTH + 1; inline bool JSObject::isStaticBlock() const { return isBlock() && !getProto(); } inline bool JSObject::isClonedBlock() const { return isBlock() && !!getProto(); } static const uint32 JSSLOT_WITH_THIS = JSSLOT_PRIVATE + 2; #define OBJ_BLOCK_COUNT(cx,obj) \ (obj)->propertyCount() #define OBJ_BLOCK_DEPTH(cx,obj) \ (obj)->getSlot(JSSLOT_BLOCK_DEPTH).toInt32() #define OBJ_SET_BLOCK_DEPTH(cx,obj,depth) \ (obj)->setSlot(JSSLOT_BLOCK_DEPTH, Value(Int32Value(depth))) /* * To make sure this slot is well-defined, always call js_NewWithObject to * create a With object, don't call js_NewObject directly. When creating a * With object that does not correspond to a stack slot, pass -1 for depth. * * When popping the stack across this object's "with" statement, client code * must call withobj->setPrivate(NULL). */ extern JS_REQUIRES_STACK JSObject * js_NewWithObject(JSContext *cx, JSObject *proto, JSObject *parent, jsint depth); inline JSObject * js_UnwrapWithObject(JSContext *cx, JSObject *withobj) { JS_ASSERT(withobj->getClass() == &js_WithClass); return withobj->getProto(); } /* * Create a new block scope object not linked to any proto or parent object. * Blocks are created by the compiler to reify let blocks and comprehensions. * Only when dynamic scope is captured do they need to be cloned and spliced * into an active scope chain. */ extern JSObject * js_NewBlockObject(JSContext *cx); extern JSObject * js_CloneBlockObject(JSContext *cx, JSObject *proto, JSStackFrame *fp); extern JS_REQUIRES_STACK JSBool js_PutBlockObject(JSContext *cx, JSBool normalUnwind); JSBool js_XDRBlockObject(JSXDRState *xdr, JSObject **objp); struct JSSharpObjectMap { jsrefcount depth; jsatomid sharpgen; JSHashTable *table; }; #define SHARP_BIT ((jsatomid) 1) #define BUSY_BIT ((jsatomid) 2) #define SHARP_ID_SHIFT 2 #define IS_SHARP(he) (uintptr_t((he)->value) & SHARP_BIT) #define MAKE_SHARP(he) ((he)->value = (void *) (uintptr_t((he)->value)|SHARP_BIT)) #define IS_BUSY(he) (uintptr_t((he)->value) & BUSY_BIT) #define MAKE_BUSY(he) ((he)->value = (void *) (uintptr_t((he)->value)|BUSY_BIT)) #define CLEAR_BUSY(he) ((he)->value = (void *) (uintptr_t((he)->value)&~BUSY_BIT)) extern JSHashEntry * js_EnterSharpObject(JSContext *cx, JSObject *obj, JSIdArray **idap, jschar **sp); extern void js_LeaveSharpObject(JSContext *cx, JSIdArray **idap); /* * Mark objects stored in map if GC happens between js_EnterSharpObject * and js_LeaveSharpObject. GC calls this when map->depth > 0. */ extern void js_TraceSharpMap(JSTracer *trc, JSSharpObjectMap *map); extern JSBool js_HasOwnPropertyHelper(JSContext *cx, js::LookupPropOp lookup, uintN argc, js::Value *vp); extern JSBool js_HasOwnProperty(JSContext *cx, js::LookupPropOp lookup, JSObject *obj, jsid id, JSObject **objp, JSProperty **propp); extern JSBool js_NewPropertyDescriptorObject(JSContext *cx, jsid id, uintN attrs, const js::Value &getter, const js::Value &setter, const js::Value &value, js::Value *vp); extern JSBool js_PropertyIsEnumerable(JSContext *cx, JSObject *obj, jsid id, js::Value *vp); #ifdef OLD_GETTER_SETTER_METHODS JS_FRIEND_API(JSBool) js_obj_defineGetter(JSContext *cx, uintN argc, js::Value *vp); JS_FRIEND_API(JSBool) js_obj_defineSetter(JSContext *cx, uintN argc, js::Value *vp); #endif extern JSObject * js_InitObjectClass(JSContext *cx, JSObject *obj); extern JSObject * js_InitClass(JSContext *cx, JSObject *obj, JSObject *parent_proto, js::Class *clasp, js::Native constructor, uintN nargs, JSPropertySpec *ps, JSFunctionSpec *fs, JSPropertySpec *static_ps, JSFunctionSpec *static_fs); /* * Select Object.prototype method names shared between jsapi.cpp and jsobj.cpp. */ extern const char js_watch_str[]; extern const char js_unwatch_str[]; extern const char js_hasOwnProperty_str[]; extern const char js_isPrototypeOf_str[]; extern const char js_propertyIsEnumerable_str[]; #ifdef OLD_GETTER_SETTER_METHODS extern const char js_defineGetter_str[]; extern const char js_defineSetter_str[]; extern const char js_lookupGetter_str[]; extern const char js_lookupSetter_str[]; #endif extern JSBool js_PopulateObject(JSContext *cx, JSObject *newborn, JSObject *props); /* * Fast access to immutable standard objects (constructors and prototypes). */ extern JSBool js_GetClassObject(JSContext *cx, JSObject *obj, JSProtoKey key, JSObject **objp); extern JSBool js_SetClassObject(JSContext *cx, JSObject *obj, JSProtoKey key, JSObject *cobj, JSObject *prototype); /* * If protoKey is not JSProto_Null, then clasp is ignored. If protoKey is * JSProto_Null, clasp must non-null. */ extern JSBool js_FindClassObject(JSContext *cx, JSObject *start, JSProtoKey key, js::Value *vp, js::Class *clasp = NULL); extern JSObject * js_ConstructObject(JSContext *cx, js::Class *clasp, JSObject *proto, JSObject *parent, uintN argc, js::Value *argv); extern JSObject * js_NewInstance(JSContext *cx, JSObject *callee); extern jsid js_CheckForStringIndex(jsid id); /* * js_PurgeScopeChain does nothing if obj is not itself a prototype or parent * scope, else it reshapes the scope and prototype chains it links. It calls * js_PurgeScopeChainHelper, which asserts that obj is flagged as a delegate * (i.e., obj has ever been on a prototype or parent chain). */ extern void js_PurgeScopeChainHelper(JSContext *cx, JSObject *obj, jsid id); inline void js_PurgeScopeChain(JSContext *cx, JSObject *obj, jsid id) { if (obj->isDelegate()) js_PurgeScopeChainHelper(cx, obj, id); } /* * Find or create a property named by id in obj's scope, with the given getter * and setter, slot, attributes, and other members. */ extern const js::Shape * js_AddNativeProperty(JSContext *cx, JSObject *obj, jsid id, js::PropertyOp getter, js::PropertyOp setter, uint32 slot, uintN attrs, uintN flags, intN shortid); /* * Change shape to have the given attrs, getter, and setter in scope, morphing * it into a potentially new js::Shape. Return a pointer to the changed * or identical property. */ extern const js::Shape * js_ChangeNativePropertyAttrs(JSContext *cx, JSObject *obj, const js::Shape *shape, uintN attrs, uintN mask, js::PropertyOp getter, js::PropertyOp setter); extern JSBool js_DefineOwnProperty(JSContext *cx, JSObject *obj, jsid id, const js::Value &descriptor, JSBool *bp); /* * Flags for the defineHow parameter of js_DefineNativeProperty. */ const uintN JSDNP_CACHE_RESULT = 1; /* an interpreter call from JSOP_INITPROP */ const uintN JSDNP_DONT_PURGE = 2; /* suppress js_PurgeScopeChain */ const uintN JSDNP_SET_METHOD = 4; /* js_{DefineNativeProperty,SetPropertyHelper} must pass the js::Shape::METHOD flag on to JSObject::{add,put}Property */ const uintN JSDNP_UNQUALIFIED = 8; /* Unqualified property set. Only used in the defineHow argument of js_SetPropertyHelper. */ /* * On error, return false. On success, if propp is non-null, return true with * obj locked and with a held property in *propp; if propp is null, return true * but release obj's lock first. Therefore all callers who pass non-null propp * result parameters must later call obj->dropProperty(cx, *propp) both to drop * the held property, and to release the lock on obj. */ extern JSBool js_DefineNativeProperty(JSContext *cx, JSObject *obj, jsid id, const js::Value &value, js::PropertyOp getter, js::PropertyOp setter, uintN attrs, uintN flags, intN shortid, JSProperty **propp, uintN defineHow = 0); /* * Specialized subroutine that allows caller to preset JSRESOLVE_* flags and * returns the index along the prototype chain in which *propp was found, or * the last index if not found, or -1 on error. */ extern int js_LookupPropertyWithFlags(JSContext *cx, JSObject *obj, jsid id, uintN flags, JSObject **objp, JSProperty **propp); /* * We cache name lookup results only for the global object or for native * non-global objects without prototype or with prototype that never mutates, * see bug 462734 and bug 487039. */ inline bool js_IsCacheableNonGlobalScope(JSObject *obj) { extern JS_FRIEND_DATA(js::Class) js_CallClass; extern JS_FRIEND_DATA(js::Class) js_DeclEnvClass; JS_ASSERT(obj->getParent()); js::Class *clasp = obj->getClass(); bool cacheable = (clasp == &js_CallClass || clasp == &js_BlockClass || clasp == &js_DeclEnvClass); JS_ASSERT_IF(cacheable, !obj->getOps()->lookupProperty); return cacheable; } /* * If cacheResult is false, return JS_NO_PROP_CACHE_FILL on success. */ extern js::PropertyCacheEntry * js_FindPropertyHelper(JSContext *cx, jsid id, JSBool cacheResult, JSObject **objp, JSObject **pobjp, JSProperty **propp); /* * Return the index along the scope chain in which id was found, or the last * index if not found, or -1 on error. */ extern JS_FRIEND_API(JSBool) js_FindProperty(JSContext *cx, jsid id, JSObject **objp, JSObject **pobjp, JSProperty **propp); extern JS_REQUIRES_STACK JSObject * js_FindIdentifierBase(JSContext *cx, JSObject *scopeChain, jsid id); extern JSObject * js_FindVariableScope(JSContext *cx, JSFunction **funp); /* * JSGET_CACHE_RESULT is the analogue of JSDNP_CACHE_RESULT for js_GetMethod. * * JSGET_METHOD_BARRIER (the default, hence 0 but provided for documentation) * enables a read barrier that preserves standard function object semantics (by * default we assume our caller won't leak a joined callee to script, where it * would create hazardous mutable object sharing as well as observable identity * according to == and ===. * * JSGET_NO_METHOD_BARRIER avoids the performance overhead of the method read * barrier, which is not needed when invoking a lambda that otherwise does not * leak its callee reference (via arguments.callee or its name). */ const uintN JSGET_CACHE_RESULT = 1; // from a caching interpreter opcode const uintN JSGET_METHOD_BARRIER = 0; // get can leak joined function object const uintN JSGET_NO_METHOD_BARRIER = 2; // call to joined function can't leak /* * NB: js_NativeGet and js_NativeSet are called with the scope containing shape * (pobj's scope for Get, obj's for Set) locked, and on successful return, that * scope is again locked. But on failure, both functions return false with the * scope containing shape unlocked. */ extern JSBool js_NativeGet(JSContext *cx, JSObject *obj, JSObject *pobj, const js::Shape *shape, uintN getHow, js::Value *vp); extern JSBool js_NativeSet(JSContext *cx, JSObject *obj, const js::Shape *shape, bool added, js::Value *vp); extern JSBool js_GetPropertyHelper(JSContext *cx, JSObject *obj, jsid id, uint32 getHow, js::Value *vp); extern bool js_GetPropertyHelperWithShape(JSContext *cx, JSObject *obj, jsid id, uint32 getHow, js::Value *vp, const js::Shape **shapeOut, JSObject **holderOut); extern JSBool js_GetOwnPropertyDescriptor(JSContext *cx, JSObject *obj, jsid id, js::Value *vp); extern JSBool js_GetMethod(JSContext *cx, JSObject *obj, jsid id, uintN getHow, js::Value *vp); /* * Check whether it is OK to assign an undeclared property with name * propname of the global object in the current script on cx. Reports * an error if one needs to be reported (in particular in all cases * when it returns false). */ extern JS_FRIEND_API(bool) js_CheckUndeclaredVarAssignment(JSContext *cx, JSString *propname); extern JSBool js_SetPropertyHelper(JSContext *cx, JSObject *obj, jsid id, uintN defineHow, js::Value *vp, JSBool strict); /* * Change attributes for the given native property. The caller must ensure * that obj is locked and this function always unlocks obj on return. */ extern JSBool js_SetNativeAttributes(JSContext *cx, JSObject *obj, js::Shape *shape, uintN attrs); namespace js { extern JSBool DefaultValue(JSContext *cx, JSObject *obj, JSType hint, Value *vp); extern JSBool CheckAccess(JSContext *cx, JSObject *obj, jsid id, JSAccessMode mode, js::Value *vp, uintN *attrsp); } /* namespace js */ extern bool js_IsDelegate(JSContext *cx, JSObject *obj, const js::Value &v); /* * If protoKey is not JSProto_Null, then clasp is ignored. If protoKey is * JSProto_Null, clasp must non-null. */ extern JS_FRIEND_API(JSBool) js_GetClassPrototype(JSContext *cx, JSObject *scope, JSProtoKey protoKey, JSObject **protop, js::Class *clasp = NULL); extern JSBool js_SetClassPrototype(JSContext *cx, JSObject *ctor, JSObject *proto, uintN attrs); /* * Wrap boolean, number or string as Boolean, Number or String object. * *vp must not be an object, null or undefined. */ extern JSBool js_PrimitiveToObject(JSContext *cx, js::Value *vp); /* * v and vp may alias. On successful return, vp->isObjectOrNull(). If vp is not * rooted, the caller must root vp before the next possible GC. */ extern JSBool js_ValueToObjectOrNull(JSContext *cx, const js::Value &v, JSObject **objp); /* * v and vp may alias. On successful return, vp->isObject(). If vp is not * rooted, the caller must root vp before the next possible GC. */ extern JSObject * js_ValueToNonNullObject(JSContext *cx, const js::Value &v); extern JSBool js_TryValueOf(JSContext *cx, JSObject *obj, JSType type, js::Value *rval); extern JSBool js_TryMethod(JSContext *cx, JSObject *obj, JSAtom *atom, uintN argc, js::Value *argv, js::Value *rval); extern JSBool js_XDRObject(JSXDRState *xdr, JSObject **objp); extern void js_TraceObject(JSTracer *trc, JSObject *obj); extern void js_PrintObjectSlotName(JSTracer *trc, char *buf, size_t bufsize); extern void js_ClearNative(JSContext *cx, JSObject *obj); extern bool js_GetReservedSlot(JSContext *cx, JSObject *obj, uint32 index, js::Value *vp); extern bool js_SetReservedSlot(JSContext *cx, JSObject *obj, uint32 index, const js::Value &v); extern JSBool js_CheckPrincipalsAccess(JSContext *cx, JSObject *scopeobj, JSPrincipals *principals, JSAtom *caller); /* For CSP -- checks if eval() and friends are allowed to run. */ extern JSBool js_CheckContentSecurityPolicy(JSContext *cx); /* Infallible -- returns its argument if there is no wrapped object. */ extern JSObject * js_GetWrappedObject(JSContext *cx, JSObject *obj); /* NB: Infallible. */ extern const char * js_ComputeFilename(JSContext *cx, JSStackFrame *caller, JSPrincipals *principals, uintN *linenop); extern JSBool js_ReportGetterOnlyAssignment(JSContext *cx); extern JS_FRIEND_API(JSBool) js_GetterOnlyPropertyStub(JSContext *cx, JSObject *obj, jsid id, jsval *vp); #ifdef DEBUG JS_FRIEND_API(void) js_DumpChars(const jschar *s, size_t n); JS_FRIEND_API(void) js_DumpString(JSString *str); JS_FRIEND_API(void) js_DumpAtom(JSAtom *atom); JS_FRIEND_API(void) js_DumpObject(JSObject *obj); JS_FRIEND_API(void) js_DumpValue(const js::Value &val); JS_FRIEND_API(void) js_DumpId(jsid id); JS_FRIEND_API(void) js_DumpStackFrame(JSContext *cx, JSStackFrame *start = NULL); bool IsSaneThisObject(JSObject &obj); #endif extern uintN js_InferFlags(JSContext *cx, uintN defaultFlags); /* Object constructor native. Exposed only so the JIT can know its address. */ JSBool js_Object(JSContext *cx, uintN argc, js::Value *vp); namespace js { extern bool SetProto(JSContext *cx, JSObject *obj, JSObject *proto, bool checkForCycles); } namespace js { extern JSString * obj_toStringHelper(JSContext *cx, JSObject *obj); } #endif /* jsobj_h___ */