/* -*- 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 "jshash.h" /* Added by JSIFY */ #include "jsprvtd.h" #include "jspubtd.h" JS_BEGIN_EXTERN_C /* For detailed comments on these function pointer types, see jsprvtd.h. */ struct JSObjectOps { /* * Custom shared object map for non-native objects. For native objects * this should be null indicating, that JSObject.map is an instance of * JSScope. */ const JSObjectMap *objectMap; /* Mandatory non-null function pointer members. */ JSLookupPropOp lookupProperty; JSDefinePropOp defineProperty; JSPropertyIdOp getProperty; JSPropertyIdOp setProperty; JSAttributesOp getAttributes; JSAttributesOp setAttributes; JSPropertyIdOp deleteProperty; JSConvertOp defaultValue; JSNewEnumerateOp enumerate; JSCheckAccessIdOp checkAccess; /* Optionally non-null members start here. */ JSObjectOp thisObject; JSPropertyRefOp dropProperty; JSNative call; JSNative construct; JSHasInstanceOp hasInstance; JSTraceOp trace; JSFinalizeOp clear; }; struct JSObjectMap { JSObjectOps *ops; /* high level object operation vtable */ }; const uint32 JS_INITIAL_NSLOTS = 5; const uint32 JSSLOT_PROTO = 0; const uint32 JSSLOT_PARENT = 1; /* * The first available slot to store generic value. For JSCLASS_HAS_PRIVATE * classes the slot stores a pointer to private data reinterpreted as jsval. * 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 = 2; const uint32 JSSLOT_PRIMITIVE_THIS = JSSLOT_PRIVATE; const uintptr_t JSSLOT_CLASS_MASK_BITS = 3; /* * 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 classword member stores the JSClass pointer for this object, with the * least two bits encoding whether this object is a "delegate" or a "system" * object. We do *not* synchronize updates of classword -- API clients must * take care. * * An object is a delegate if it is on another object's prototype (linked by * JSSLOT_PROTO) or scope (JSSLOT_PARENT) chain, 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 classword tag 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 jsvals for reserved and dynamic slots. If dslots is not null, dslots[-1] * records the number of available slots. */ struct JSObject { JSObjectMap *map; /* propery map, see jsscope.h */ jsuword classword; /* classword, see above */ jsval fslots[JS_INITIAL_NSLOTS]; /* small number of fixed slots */ jsval *dslots; /* dynamically allocated slots */ JSClass *getClass() const { return (JSClass *) (classword & ~JSSLOT_CLASS_MASK_BITS); } bool isDelegate() const { return (classword & jsuword(1)) != jsuword(0); } void setDelegate() { classword |= jsuword(1); } static void setDelegateNullSafe(JSObject *obj) { if (obj) obj->setDelegate(); } bool isSystem() const { return (classword & jsuword(2)) != jsuword(0); } void setSystem() { classword |= jsuword(2); } JSObject *getProto() const { return JSVAL_TO_OBJECT(fslots[JSSLOT_PROTO]); } void clearProto() { fslots[JSSLOT_PROTO] = JSVAL_NULL; } void setProto(JSObject *newProto) { setDelegateNullSafe(newProto); fslots[JSSLOT_PROTO] = OBJECT_TO_JSVAL(newProto); } JSObject *getParent() const { return JSVAL_TO_OBJECT(fslots[JSSLOT_PARENT]); } void clearParent() { fslots[JSSLOT_PARENT] = JSVAL_NULL; } void setParent(JSObject *newParent) { setDelegateNullSafe(newParent); fslots[JSSLOT_PARENT] = OBJECT_TO_JSVAL(newParent); } void traceProtoAndParent(JSTracer *trc) const { JSObject *proto = getProto(); if (proto) JS_CALL_OBJECT_TRACER(trc, proto, "__proto__"); JSObject *parent = getParent(); if (parent) JS_CALL_OBJECT_TRACER(trc, parent, "__parent__"); } void *getPrivate() const { JS_ASSERT(getClass()->flags & JSCLASS_HAS_PRIVATE); jsval v = fslots[JSSLOT_PRIVATE]; JS_ASSERT((v & jsval(1)) == jsval(0)); return reinterpret_cast(v); } void setPrivate(void *data) { JS_ASSERT(getClass()->flags & JSCLASS_HAS_PRIVATE); jsval v = reinterpret_cast(data); JS_ASSERT((v & jsval(1)) == jsval(0)); fslots[JSSLOT_PRIVATE] = v; } static jsval defaultPrivate(JSClass *clasp) { return (clasp->flags & JSCLASS_HAS_PRIVATE) ? JSVAL_NULL : JSVAL_VOID; } /* The map field is not initialized here and should be set separately. */ void init(JSClass *clasp, JSObject *proto, JSObject *parent, jsval privateSlotValue) { JS_ASSERT(((jsuword) clasp & 3) == 0); JS_STATIC_ASSERT(JSSLOT_PRIVATE + 3 == JS_INITIAL_NSLOTS); JS_ASSERT_IF(clasp->flags & JSCLASS_HAS_PRIVATE, (privateSlotValue & jsval(1)) == jsval(0)); classword = jsuword(clasp); JS_ASSERT(!isDelegate()); JS_ASSERT(!isSystem()); setProto(proto); setParent(parent); fslots[JSSLOT_PRIVATE] = privateSlotValue; fslots[JSSLOT_PRIVATE + 1] = JSVAL_VOID; fslots[JSSLOT_PRIVATE + 2] = JSVAL_VOID; dslots = NULL; } JSBool lookupProperty(JSContext *cx, jsid id, JSObject **objp, JSProperty **propp) { return map->ops->lookupProperty(cx, this, id, objp, propp); } JSBool defineProperty(JSContext *cx, jsid id, jsval value, JSPropertyOp getter, JSPropertyOp setter, uintN attrs) { return map->ops->defineProperty(cx, this, id, value, getter, setter, attrs); } JSBool getProperty(JSContext *cx, jsid id, jsval *vp) { return map->ops->getProperty(cx, this, id, vp); } JSBool setProperty(JSContext *cx, jsid id, jsval *vp) { return map->ops->setProperty(cx, this, id, vp); } JSBool getAttributes(JSContext *cx, jsid id, JSProperty *prop, uintN *attrsp) { return map->ops->getAttributes(cx, this, id, prop, attrsp); } JSBool setAttributes(JSContext *cx, jsid id, JSProperty *prop, uintN *attrsp) { return map->ops->setAttributes(cx, this, id, prop, attrsp); } JSBool deleteProperty(JSContext *cx, jsid id, jsval *rval) { return map->ops->deleteProperty(cx, this, id, rval); } JSBool defaultValue(JSContext *cx, JSType hint, jsval *vp) { return map->ops->defaultValue(cx, this, hint, vp); } JSBool enumerate(JSContext *cx, JSIterateOp op, jsval *statep, jsid *idp) { return map->ops->enumerate(cx, this, op, statep, idp); } JSBool checkAccess(JSContext *cx, jsid id, JSAccessMode mode, jsval *vp, uintN *attrsp) { return map->ops->checkAccess(cx, this, id, mode, vp, attrsp); } /* These four are time-optimized to avoid stub calls. */ JSObject *thisObject(JSContext *cx) { return map->ops->thisObject ? map->ops->thisObject(cx, this) : this; } void dropProperty(JSContext *cx, JSProperty *prop) { if (map->ops->dropProperty) map->ops->dropProperty(cx, this, prop); } }; /* Compatibility macros. */ #define STOBJ_GET_PROTO(obj) ((obj)->getProto()) #define STOBJ_SET_PROTO(obj,proto) ((obj)->setProto(proto)) #define STOBJ_CLEAR_PROTO(obj) ((obj)->clearProto()) #define STOBJ_GET_PARENT(obj) ((obj)->getParent()) #define STOBJ_SET_PARENT(obj,parent) ((obj)->setParent(parent)) #define STOBJ_CLEAR_PARENT(obj) ((obj)->clearParent()) #define OBJ_GET_PROTO(cx,obj) STOBJ_GET_PROTO(obj) #define OBJ_SET_PROTO(cx,obj,proto) STOBJ_SET_PROTO(obj, proto) #define OBJ_CLEAR_PROTO(cx,obj) STOBJ_CLEAR_PROTO(obj) #define OBJ_GET_PARENT(cx,obj) STOBJ_GET_PARENT(obj) #define OBJ_SET_PARENT(cx,obj,parent) STOBJ_SET_PARENT(obj, parent) #define OBJ_CLEAR_PARENT(cx,obj) STOBJ_CLEAR_PARENT(obj) #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 (JS_MAX(~uint32(0), ~size_t(0)) / sizeof(jsval) - 1) #define MAX_DSLOTS_LENGTH32 (~uint32(0) / sizeof(jsval) - 1) /* * STOBJ prefix means Single Threaded Object. Use the following fast macros to * directly manipulate slots in obj when only one thread can access obj, or * when accessing read-only slots within JS_INITIAL_NSLOTS. */ #define STOBJ_NSLOTS(obj) \ ((obj)->dslots ? (uint32)(obj)->dslots[-1] : (uint32)JS_INITIAL_NSLOTS) #define STOBJ_GET_SLOT(obj,slot) \ ((slot) < JS_INITIAL_NSLOTS \ ? (obj)->fslots[(slot)] \ : (JS_ASSERT((slot) < (uint32)(obj)->dslots[-1]), \ (obj)->dslots[(slot) - JS_INITIAL_NSLOTS])) #define STOBJ_SET_SLOT(obj,slot,value) \ ((slot) < JS_INITIAL_NSLOTS \ ? (obj)->fslots[(slot)] = (value) \ : (JS_ASSERT((slot) < (uint32)(obj)->dslots[-1]), \ (obj)->dslots[(slot) - JS_INITIAL_NSLOTS] = (value))) inline JSClass* STOBJ_GET_CLASS(const JSObject* obj) { return obj->getClass(); } #define OBJ_CHECK_SLOT(obj,slot) \ (JS_ASSERT(OBJ_IS_NATIVE(obj)), JS_ASSERT(slot < OBJ_SCOPE(obj)->freeslot)) #define LOCKED_OBJ_GET_SLOT(obj,slot) \ (OBJ_CHECK_SLOT(obj, slot), STOBJ_GET_SLOT(obj, slot)) #define LOCKED_OBJ_SET_SLOT(obj,slot,value) \ (OBJ_CHECK_SLOT(obj, slot), STOBJ_SET_SLOT(obj, slot, value)) #ifdef JS_THREADSAFE /* Thread-safe functions and wrapper macros for accessing slots in obj. */ #define OBJ_GET_SLOT(cx,obj,slot) \ (OBJ_CHECK_SLOT(obj, slot), \ (OBJ_SCOPE(obj)->title.ownercx == cx) \ ? LOCKED_OBJ_GET_SLOT(obj, slot) \ : js_GetSlotThreadSafe(cx, obj, slot)) #define OBJ_SET_SLOT(cx,obj,slot,value) \ JS_BEGIN_MACRO \ OBJ_CHECK_SLOT(obj, slot); \ if (OBJ_SCOPE(obj)->title.ownercx == cx) \ LOCKED_OBJ_SET_SLOT(obj, slot, value); \ else \ js_SetSlotThreadSafe(cx, obj, slot, value); \ JS_END_MACRO /* * If thread-safe, define an OBJ_GET_SLOT wrapper that bypasses, for a native * object, the lock-free "fast path" test of (OBJ_SCOPE(obj)->ownercx == cx), * to avoid needlessly switching from lock-free to lock-full scope when doing * GC on a different context from the last one to own the scope. The caller * in this case is probably a JSClass.mark function, e.g., fun_mark, or maybe * a finalizer. * * The GC runs only when all threads except the one on which the GC is active * are suspended at GC-safe points, so calling STOBJ_GET_SLOT from the GC's * thread is safe when rt->gcRunning is set. See jsgc.c 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) #else /* !JS_THREADSAFE */ #define OBJ_GET_SLOT(cx,obj,slot) LOCKED_OBJ_GET_SLOT(obj,slot) #define OBJ_SET_SLOT(cx,obj,slot,value) LOCKED_OBJ_SET_SLOT(obj,slot,value) #endif /* !JS_THREADSAFE */ /* * Class is invariant and comes from the fixed clasp member. Thus no locking * is necessary to read it. Same for the private slot. */ #define OBJ_GET_CLASS(cx,obj) STOBJ_GET_CLASS(obj) /* * Test whether the object is native. FIXME bug 492938: consider how it would * affect the performance to do just the !ops->objectMap check. */ #define OPS_IS_NATIVE(ops) \ JS_LIKELY((ops) == &js_ObjectOps || !(ops)->objectMap) #define OBJ_IS_NATIVE(obj) OPS_IS_NATIVE((obj)->map->ops) #ifdef __cplusplus inline void OBJ_TO_INNER_OBJECT(JSContext *cx, JSObject *&obj) { JSClass *clasp = OBJ_GET_CLASS(cx, obj); if (clasp->flags & JSCLASS_IS_EXTENDED) { JSExtendedClass *xclasp = (JSExtendedClass *) clasp; if (xclasp->innerObject) obj = xclasp->innerObject(cx, obj); } } /* * The following function has been copied to jsd/jsd_val.c. If making changes to * OBJ_TO_OUTER_OBJECT, please update jsd/jsd_val.c as well. */ inline void OBJ_TO_OUTER_OBJECT(JSContext *cx, JSObject *&obj) { JSClass *clasp = OBJ_GET_CLASS(cx, obj); if (clasp->flags & JSCLASS_IS_EXTENDED) { JSExtendedClass *xclasp = (JSExtendedClass *) clasp; if (xclasp->outerObject) obj = xclasp->outerObject(cx, obj); } } #endif extern JS_FRIEND_DATA(JSObjectOps) js_ObjectOps; extern JS_FRIEND_DATA(JSObjectOps) js_WithObjectOps; extern JSClass js_ObjectClass; extern JSClass js_WithClass; extern JSClass 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). */ #define JSSLOT_BLOCK_DEPTH (JSSLOT_PRIVATE + 1) static inline bool OBJ_IS_CLONED_BLOCK(JSObject *obj) { return obj->getProto() != NULL; } extern JSBool js_DefineBlockVariable(JSContext *cx, JSObject *obj, jsid id, int16 index); #define OBJ_BLOCK_COUNT(cx,obj) \ (OBJ_SCOPE(obj)->entryCount) #define OBJ_BLOCK_DEPTH(cx,obj) \ JSVAL_TO_INT(STOBJ_GET_SLOT(obj, JSSLOT_BLOCK_DEPTH)) #define OBJ_SET_BLOCK_DEPTH(cx,obj,depth) \ STOBJ_SET_SLOT(obj, JSSLOT_BLOCK_DEPTH, INT_TO_JSVAL(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); /* * 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) (JS_PTR_TO_UINT32((he)->value) & SHARP_BIT) #define MAKE_SHARP(he) ((he)->value = JS_UINT32_TO_PTR(JS_PTR_TO_UINT32((he)->value)|SHARP_BIT)) #define IS_BUSY(he) (JS_PTR_TO_UINT32((he)->value) & BUSY_BIT) #define MAKE_BUSY(he) ((he)->value = JS_UINT32_TO_PTR(JS_PTR_TO_UINT32((he)->value)|BUSY_BIT)) #define CLEAR_BUSY(he) ((he)->value = JS_UINT32_TO_PTR(JS_PTR_TO_UINT32((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, JSLookupPropOp lookup, uintN argc, jsval *vp); extern JSBool js_HasOwnProperty(JSContext *cx, JSLookupPropOp lookup, JSObject *obj, jsid id, JSBool *foundp); extern JSBool js_PropertyIsEnumerable(JSContext *cx, JSObject *obj, jsid id, jsval *vp); extern JSObject * js_InitEval(JSContext *cx, JSObject *obj); extern JSObject * js_InitObjectClass(JSContext *cx, JSObject *obj); extern JSObject * js_InitClass(JSContext *cx, JSObject *obj, JSObject *parent_proto, JSClass *clasp, JSNative 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[]; extern const char js_defineGetter_str[]; extern const char js_defineSetter_str[]; extern const char js_lookupGetter_str[]; extern const char js_lookupSetter_str[]; extern JSBool js_GetClassId(JSContext *cx, JSClass *clasp, jsid *idp); extern JSObject * js_NewObject(JSContext *cx, JSClass *clasp, JSObject *proto, JSObject *parent, size_t objectSize = 0); /* * See jsapi.h, JS_NewObjectWithGivenProto. */ extern JSObject * js_NewObjectWithGivenProto(JSContext *cx, JSClass *clasp, JSObject *proto, JSObject *parent, size_t objectSize = 0); /* * Allocate a new native object with the given value of the proto and private * slots. The parent slot is set to the value of proto's parent slot. * * Note that this is the correct global object for native class instances, but * not for user-defined functions called as constructors. Functions used as * constructors must create instances parented by the parent of the function * object, not by the parent of its .prototype object value. */ extern JSObject* js_NewNativeObject(JSContext *cx, JSClass *clasp, JSObject *proto, jsval privateSlotValue); /* * 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); extern JSBool js_FindClassObject(JSContext *cx, JSObject *start, jsid id, jsval *vp); extern JSObject * js_ConstructObject(JSContext *cx, JSClass *clasp, JSObject *proto, JSObject *parent, uintN argc, jsval *argv); extern JSBool js_AllocSlot(JSContext *cx, JSObject *obj, uint32 *slotp); extern void js_FreeSlot(JSContext *cx, JSObject *obj, uint32 slot); extern bool js_GrowSlots(JSContext *cx, JSObject *obj, size_t nslots); extern void js_ShrinkSlots(JSContext *cx, JSObject *obj, size_t nslots); static inline void js_FreeSlots(JSContext *cx, JSObject *obj) { if (obj->dslots) js_ShrinkSlots(cx, obj, 0); } /* * Ensure that the object has at least JSCLASS_RESERVED_SLOTS(clasp)+nreserved * slots. The function can be called only for native objects just created with * js_NewObject or its forms. In particular, the object should not be shared * between threads and its dslots array must be null. nreserved must match the * value that JSClass.reserveSlots (if any) would return after the object is * fully initialized. */ bool js_EnsureReservedSlots(JSContext *cx, JSObject *obj, size_t nreserved); 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); #ifdef __cplusplus /* Aargh, libgjs, bug 492720. */ static JS_INLINE void js_PurgeScopeChain(JSContext *cx, JSObject *obj, jsid id) { if (obj->isDelegate()) js_PurgeScopeChainHelper(cx, obj, id); } #endif /* * Find or create a property named by id in obj's scope, with the given getter * and setter, slot, attributes, and other members. */ extern JSScopeProperty * js_AddNativeProperty(JSContext *cx, JSObject *obj, jsid id, JSPropertyOp getter, JSPropertyOp setter, uint32 slot, uintN attrs, uintN flags, intN shortid); /* * Change sprop to have the given attrs, getter, and setter in scope, morphing * it into a potentially new JSScopeProperty. Return a pointer to the changed * or identical property. */ extern JSScopeProperty * js_ChangeNativePropertyAttrs(JSContext *cx, JSObject *obj, JSScopeProperty *sprop, uintN attrs, uintN mask, JSPropertyOp getter, JSPropertyOp setter); extern JSBool js_DefineProperty(JSContext *cx, JSObject *obj, jsid id, jsval value, JSPropertyOp getter, JSPropertyOp setter, uintN attrs); /* * 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 SPROP_IS_METHOD flag on to js_AddScopeProperty */ /* * 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, jsval value, JSPropertyOp getter, JSPropertyOp setter, uintN attrs, uintN flags, intN shortid, JSProperty **propp, uintN defineHow = 0); /* * 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); /* * 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. */ static inline bool js_IsCacheableNonGlobalScope(JSObject *obj) { extern JS_FRIEND_DATA(JSClass) js_CallClass; extern JS_FRIEND_DATA(JSClass) js_DeclEnvClass; JS_ASSERT(STOBJ_GET_PARENT(obj)); JSClass *clasp = STOBJ_GET_CLASS(obj); bool cacheable = (clasp == &js_CallClass || clasp == &js_BlockClass || clasp == &js_DeclEnvClass); JS_ASSERT_IF(cacheable, obj->map->ops->lookupProperty == js_LookupProperty); return cacheable; } /* * If cacheResult is false, return JS_NO_PROP_CACHE_FILL on success. */ extern JSPropCacheEntry * 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 sprop * (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 sprop unlocked. */ extern JSBool js_NativeGet(JSContext *cx, JSObject *obj, JSObject *pobj, JSScopeProperty *sprop, uintN getHow, jsval *vp); extern JSBool js_NativeSet(JSContext *cx, JSObject *obj, JSScopeProperty *sprop, bool added, jsval *vp); extern JSBool js_GetPropertyHelper(JSContext *cx, JSObject *obj, jsid id, uintN getHow, jsval *vp); extern JSBool js_GetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp); extern JSBool js_GetMethod(JSContext *cx, JSObject *obj, jsid id, uintN getHow, jsval *vp); /* * Check whether it is OK to assign an undeclared property of the global * object at the current script PC. */ extern JS_FRIEND_API(JSBool) js_CheckUndeclaredVarAssignment(JSContext *cx); extern JSBool js_SetPropertyHelper(JSContext *cx, JSObject *obj, jsid id, uintN defineHow, jsval *vp); extern JSBool js_SetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp); extern JSBool js_GetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop, uintN *attrsp); extern JSBool js_SetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop, uintN *attrsp); extern JSBool js_DeleteProperty(JSContext *cx, JSObject *obj, jsid id, jsval *rval); extern JSBool js_DefaultValue(JSContext *cx, JSObject *obj, JSType hint, jsval *vp); extern JSBool js_Enumerate(JSContext *cx, JSObject *obj, JSIterateOp enum_op, jsval *statep, jsid *idp); extern void js_TraceNativeEnumerators(JSTracer *trc); extern JSBool js_CheckAccess(JSContext *cx, JSObject *obj, jsid id, JSAccessMode mode, jsval *vp, uintN *attrsp); extern JSBool js_Call(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval); extern JSBool js_Construct(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval); extern JSBool js_HasInstance(JSContext *cx, JSObject *obj, jsval v, JSBool *bp); extern JSBool js_SetProtoOrParent(JSContext *cx, JSObject *obj, uint32 slot, JSObject *pobj, JSBool checkForCycles); extern JSBool js_IsDelegate(JSContext *cx, JSObject *obj, jsval v, JSBool *bp); extern JSBool js_GetClassPrototype(JSContext *cx, JSObject *scope, jsid id, JSObject **protop); 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, jsval *vp); extern JSBool js_ValueToObject(JSContext *cx, jsval v, JSObject **objp); extern JSObject * js_ValueToNonNullObject(JSContext *cx, jsval v); extern JSBool js_TryValueOf(JSContext *cx, JSObject *obj, JSType type, jsval *rval); extern JSBool js_TryMethod(JSContext *cx, JSObject *obj, JSAtom *atom, uintN argc, jsval *argv, jsval *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_Clear(JSContext *cx, JSObject *obj); extern bool js_GetReservedSlot(JSContext *cx, JSObject *obj, uint32 index, jsval *vp); bool js_SetReservedSlot(JSContext *cx, JSObject *obj, uint32 index, jsval v); /* * Precondition: obj must be locked. */ extern JSBool js_ReallocSlots(JSContext *cx, JSObject *obj, uint32 nslots, JSBool exactAllocation); extern JSObject * js_CheckScopeChainValidity(JSContext *cx, JSObject *scopeobj, const char *caller); extern JSBool js_CheckPrincipalsAccess(JSContext *cx, JSObject *scopeobj, JSPrincipals *principals, JSAtom *caller); /* 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); /* Infallible, therefore cx is last parameter instead of first. */ extern JSBool js_IsCallable(JSObject *obj, JSContext *cx); void js_ReportGetterOnlyAssignment(JSContext *cx); extern JS_FRIEND_API(JSBool) js_GetterOnlyPropertyStub(JSContext *cx, JSObject *obj, jsval id, jsval *vp); /* * If an object is "similar" to its prototype, it can share OBJ_SCOPE(proto)->emptyScope. * Similar objects have the same JSObjectOps and the same JSClass. * * We assume that if prototype and object are of the same class, they always * have the same number of computed reserved slots (returned via * clasp->reserveSlots). This is true for builtin classes (except Block, and * for this reason among others Blocks must never be exposed to scripts). */ static inline bool js_ObjectIsSimilarToProto(JSContext *cx, JSObject *obj, JSObjectOps *ops, JSClass *clasp, JSObject *proto) { JS_ASSERT(proto == OBJ_GET_PROTO(cx, obj)); return (proto->map->ops == ops && OBJ_GET_CLASS(cx, proto) == clasp); } #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_DumpValue(jsval val); JS_FRIEND_API(void) js_DumpId(jsid id); JS_FRIEND_API(void) js_DumpObject(JSObject *obj); JS_FRIEND_API(void) js_DumpStackFrame(JSStackFrame *fp); #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, JSObject *obj, uintN argc, jsval *argv, jsval *rval); JS_END_EXTERN_C #endif /* jsobj_h___ */