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Bug 909178 (part 2) - Make jsclass.h not depend on jsapi.h, and rename it js/Class.h. r=jwalden.

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--HG--
rename : js/src/jsclass.h => js/public/Class.h
extra : rebase_source : 31ecd4074181c234f7f71eef04a10ae371c35eaa
This commit is contained in:
Nicholas Nethercote 2013-08-21 22:26:57 -07:00
parent c31cde29ea
commit 4b89de8370
11 changed files with 733 additions and 734 deletions
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2
js/ipc/JavaScriptParent.h
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@ -10,7 +10,7 @@
#include "JavaScriptShared.h"
#include "mozilla/jsipc/PJavaScriptParent.h"
#include "jsclass.h"
#include "js/Class.h"
#ifdef XP_WIN
#undef GetClassName

721
js/public/Class.h Normal file
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@ -0,0 +1,721 @@
/* -*- 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/. */
/* JSClass definition and its component types, plus related interfaces. */
#ifndef js_Class_h
#define js_Class_h
#include "jspubtd.h"
#include "jstypes.h"
#include "js/CallArgs.h"
#include "js/Id.h"
/*
* A JSClass acts as a vtable for JS objects that allows JSAPI clients to
* control various aspects of the behavior of an object like property lookup.
* js::Class is an engine-private extension that allows more control over
* object behavior and, e.g., allows custom slow layout.
*/
class JSFreeOp;
namespace JS {
template <typename T> class Handle;
template <typename T> class MutableHandle;
class Value;
typedef JS::Handle<JSObject*> HandleObject;
typedef JS::Handle<jsid> HandleId;
typedef JS::Handle<JS::Value> HandleValue;
typedef JS::MutableHandle<JSObject*> MutableHandleObject;
typedef JS::MutableHandle<JS::Value> MutableHandleValue;
}
namespace js {
class Class;
class FreeOp;
class PropertyId;
class PropertyName;
class Shape;
class SpecialId;
// This is equal to JSFunction::class_. Use it in places where you don't want
// to #include jsfun.h.
extern JS_FRIEND_DATA(js::Class* const) FunctionClassPtr;
static JS_ALWAYS_INLINE jsid
SPECIALID_TO_JSID(const SpecialId &sid);
/*
* We partition the ways to refer to a property into three: by an index
* (uint32_t); by a string whose characters do not represent an index
* (PropertyName, see vm/String.h); and by various special values.
*
* Special values are encoded using SpecialId, which is layout-compatible but
* non-interconvertible with jsid. A SpecialId is used for JSID_VOID, which
* does not occur in JS scripts but may be used to indicate the absence of a
* valid identifier. In the future, a SpecialId may also be an object used by
* Harmony-proposed private names.
*/
class SpecialId
{
uintptr_t bits_;
/* Needs access to raw bits. */
friend JS_ALWAYS_INLINE jsid SPECIALID_TO_JSID(const SpecialId &sid);
friend class PropertyId;
static const uintptr_t TYPE_VOID = JSID_TYPE_VOID;
static const uintptr_t TYPE_OBJECT = JSID_TYPE_OBJECT;
static const uintptr_t TYPE_MASK = JSID_TYPE_MASK;
SpecialId(uintptr_t bits) : bits_(bits) { }
public:
SpecialId() : bits_(TYPE_VOID) { }
/* Object-valued */
SpecialId(JSObject &obj)
: bits_(uintptr_t(&obj) | TYPE_OBJECT)
{
JS_ASSERT(&obj != NULL);
JS_ASSERT((uintptr_t(&obj) & TYPE_MASK) == 0);
}
bool isObject() const {
return (bits_ & TYPE_MASK) == TYPE_OBJECT && bits_ != TYPE_OBJECT;
}
JSObject *toObject() const {
JS_ASSERT(isObject());
return reinterpret_cast<JSObject *>(bits_ & ~TYPE_MASK);
}
/* Empty */
static SpecialId empty() {
SpecialId sid(TYPE_OBJECT);
JS_ASSERT(sid.isEmpty());
return sid;
}
bool isEmpty() const {
return bits_ == TYPE_OBJECT;
}
/* Void */
static SpecialId voidId() {
SpecialId sid(TYPE_VOID);
JS_ASSERT(sid.isVoid());
return sid;
}
bool isVoid() const {
return bits_ == TYPE_VOID;
}
};
static JS_ALWAYS_INLINE jsid
SPECIALID_TO_JSID(const SpecialId &sid)
{
jsid id;
JSID_BITS(id) = sid.bits_;
JS_ASSERT_IF(sid.isObject(), JSID_IS_OBJECT(id) && JSID_TO_OBJECT(id) == sid.toObject());
JS_ASSERT_IF(sid.isVoid(), JSID_IS_VOID(id));
JS_ASSERT_IF(sid.isEmpty(), JSID_IS_EMPTY(id));
return id;
}
static JS_ALWAYS_INLINE bool
JSID_IS_SPECIAL(jsid id)
{
return JSID_IS_OBJECT(id) || JSID_IS_EMPTY(id) || JSID_IS_VOID(id);
}
static JS_ALWAYS_INLINE SpecialId
JSID_TO_SPECIALID(jsid id)
{
JS_ASSERT(JSID_IS_SPECIAL(id));
if (JSID_IS_OBJECT(id))
return SpecialId(*JSID_TO_OBJECT(id));
if (JSID_IS_EMPTY(id))
return SpecialId::empty();
JS_ASSERT(JSID_IS_VOID(id));
return SpecialId::voidId();
}
typedef JS::Handle<SpecialId> HandleSpecialId;
} // namespace js
// JSClass operation signatures.
// Add or get a property named by id in obj. Note the jsid id type -- id may
// be a string (Unicode property identifier) or an int (element index). The
// *vp out parameter, on success, is the new property value after the action.
typedef bool
(* JSPropertyOp)(JSContext *cx, JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
JS::MutableHandle<JS::Value> vp);
// Set a property named by id in obj, treating the assignment as strict
// mode code if strict is true. Note the jsid id type -- id may be a string
// (Unicode property identifier) or an int (element index). The *vp out
// parameter, on success, is the new property value after the
// set.
typedef bool
(* JSStrictPropertyOp)(JSContext *cx, JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
bool strict, JS::MutableHandle<JS::Value> vp);
// Delete a property named by id in obj.
//
// If an error occurred, return false as per normal JSAPI error practice.
//
// If no error occurred, but the deletion attempt wasn't allowed (perhaps
// because the property was non-configurable), set *succeeded to false and
// return true. This will cause |delete obj[id]| to evaluate to false in
// non-strict mode code, and to throw a TypeError in strict mode code.
//
// If no error occurred and the deletion wasn't disallowed (this is *not* the
// same as saying that a deletion actually occurred -- deleting a non-existent
// property, or an inherited property, is allowed -- it's just pointless),
// set *succeeded to true and return true.
typedef bool
(* JSDeletePropertyOp)(JSContext *cx, JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
bool *succeeded);
// This function type is used for callbacks that enumerate the properties of
// a JSObject. The behavior depends on the value of enum_op:
//
// JSENUMERATE_INIT
// A new, opaque iterator state should be allocated and stored in *statep.
// (You can use PRIVATE_TO_JSVAL() to tag the pointer to be stored).
//
// The number of properties that will be enumerated should be returned as
// an integer jsval in *idp, if idp is non-null, and provided the number of
// enumerable properties is known. If idp is non-null and the number of
// enumerable properties can't be computed in advance, *idp should be set
// to JSVAL_ZERO.
//
// JSENUMERATE_INIT_ALL
// Used identically to JSENUMERATE_INIT, but exposes all properties of the
// object regardless of enumerability.
//
// JSENUMERATE_NEXT
// A previously allocated opaque iterator state is passed in via statep.
// Return the next jsid in the iteration using *idp. The opaque iterator
// state pointed at by statep is destroyed and *statep is set to JSVAL_NULL
// if there are no properties left to enumerate.
//
// JSENUMERATE_DESTROY
// Destroy the opaque iterator state previously allocated in *statep by a
// call to this function when enum_op was JSENUMERATE_INIT or
// JSENUMERATE_INIT_ALL.
//
// The return value is used to indicate success, with a value of false
// indicating failure.
typedef bool
(* JSNewEnumerateOp)(JSContext *cx, JS::Handle<JSObject*> obj, JSIterateOp enum_op,
JS::MutableHandle<JS::Value> statep, JS::MutableHandle<jsid> idp);
// The old-style JSClass.enumerate op should define all lazy properties not
// yet reflected in obj.
typedef bool
(* JSEnumerateOp)(JSContext *cx, JS::Handle<JSObject*> obj);
// Resolve a lazy property named by id in obj by defining it directly in obj.
// Lazy properties are those reflected from some peer native property space
// (e.g., the DOM attributes for a given node reflected as obj) on demand.
//
// JS looks for a property in an object, and if not found, tries to resolve
// the given id. If resolve succeeds, the engine looks again in case resolve
// defined obj[id]. If no such property exists directly in obj, the process
// is repeated with obj's prototype, etc.
//
// NB: JSNewResolveOp provides a cheaper way to resolve lazy properties.
typedef bool
(* JSResolveOp)(JSContext *cx, JS::Handle<JSObject*> obj, JS::Handle<jsid> id);
// Like JSResolveOp, but flags provide contextual information as follows:
//
// JSRESOLVE_ASSIGNING obj[id] is on the left-hand side of an assignment
//
// The *objp out parameter, on success, should be null to indicate that id
// was not resolved; and non-null, referring to obj or one of its prototypes,
// if id was resolved. The hook may assume *objp is null on entry.
//
// This hook instead of JSResolveOp is called via the JSClass.resolve member
// if JSCLASS_NEW_RESOLVE is set in JSClass.flags.
typedef bool
(* JSNewResolveOp)(JSContext *cx, JS::Handle<JSObject*> obj, JS::Handle<jsid> id, unsigned flags,
JS::MutableHandle<JSObject*> objp);
// Convert obj to the given type, returning true with the resulting value in
// *vp on success, and returning false on error or exception.
typedef bool
(* JSConvertOp)(JSContext *cx, JS::Handle<JSObject*> obj, JSType type,
JS::MutableHandle<JS::Value> vp);
// Finalize obj, which the garbage collector has determined to be unreachable
// from other live objects or from GC roots. Obviously, finalizers must never
// store a reference to obj.
typedef void
(* JSFinalizeOp)(JSFreeOp *fop, JSObject *obj);
// Finalizes external strings created by JS_NewExternalString.
struct JSStringFinalizer {
void (*finalize)(const JSStringFinalizer *fin, jschar *chars);
};
// JSClass.checkAccess type: check whether obj[id] may be accessed per mode,
// returning false on error/exception, true on success with obj[id]'s last-got
// value in *vp, and its attributes in *attrsp. As for JSPropertyOp above, id
// is either a string or an int jsval.
typedef bool
(* JSCheckAccessOp)(JSContext *cx, JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
JSAccessMode mode, JS::MutableHandle<JS::Value> vp);
// Check whether v is an instance of obj. Return false on error or exception,
// true on success with true in *bp if v is an instance of obj, false in
// *bp otherwise.
typedef bool
(* JSHasInstanceOp)(JSContext *cx, JS::Handle<JSObject*> obj, JS::MutableHandle<JS::Value> vp,
bool *bp);
// Function type for trace operation of the class called to enumerate all
// traceable things reachable from obj's private data structure. For each such
// thing, a trace implementation must call one of the JS_Call*Tracer variants
// on the thing.
//
// JSTraceOp implementation can assume that no other threads mutates object
// state. It must not change state of the object or corresponding native
// structures. The only exception for this rule is the case when the embedding
// needs a tight integration with GC. In that case the embedding can check if
// the traversal is a part of the marking phase through calling
// JS_IsGCMarkingTracer and apply a special code like emptying caches or
// marking its native structures.
typedef void
(* JSTraceOp)(JSTracer *trc, JSObject *obj);
// Callback that JSTraceOp implementation can provide to return a string
// describing the reference traced with JS_CallTracer.
typedef void
(* JSTraceNamePrinter)(JSTracer *trc, char *buf, size_t bufsize);
// A generic type for functions mapping an object to another object, or null
// if an error or exception was thrown on cx.
typedef JSObject *
(* JSObjectOp)(JSContext *cx, JS::Handle<JSObject*> obj);
// Hook that creates an iterator object for a given object. Returns the
// iterator object or null if an error or exception was thrown on cx.
typedef JSObject *
(* JSIteratorOp)(JSContext *cx, JS::HandleObject obj, bool keysonly);
typedef JSObject *
(* JSWeakmapKeyDelegateOp)(JSObject *obj);
/* js::Class operation signatures. */
namespace js {
typedef bool
(* LookupGenericOp)(JSContext *cx, JS::HandleObject obj, JS::HandleId id,
JS::MutableHandleObject objp, JS::MutableHandle<Shape*> propp);
typedef bool
(* LookupPropOp)(JSContext *cx, JS::HandleObject obj, JS::Handle<PropertyName*> name,
JS::MutableHandleObject objp, JS::MutableHandle<Shape*> propp);
typedef bool
(* LookupElementOp)(JSContext *cx, JS::HandleObject obj, uint32_t index,
JS::MutableHandleObject objp, JS::MutableHandle<Shape*> propp);
typedef bool
(* LookupSpecialOp)(JSContext *cx, JS::HandleObject obj, HandleSpecialId sid,
JS::MutableHandleObject objp, JS::MutableHandle<Shape*> propp);
typedef bool
(* DefineGenericOp)(JSContext *cx, JS::HandleObject obj, JS::HandleId id, JS::HandleValue value,
JSPropertyOp getter, JSStrictPropertyOp setter, unsigned attrs);
typedef bool
(* DefinePropOp)(JSContext *cx, JS::HandleObject obj, JS::Handle<PropertyName*> name,
JS::HandleValue value, JSPropertyOp getter, JSStrictPropertyOp setter,
unsigned attrs);
typedef bool
(* DefineElementOp)(JSContext *cx, JS::HandleObject obj, uint32_t index, JS::HandleValue value,
JSPropertyOp getter, JSStrictPropertyOp setter, unsigned attrs);
typedef bool
(* DefineSpecialOp)(JSContext *cx, JS::HandleObject obj, HandleSpecialId sid,
JS::HandleValue value, JSPropertyOp getter, JSStrictPropertyOp setter,
unsigned attrs);
typedef bool
(* GenericIdOp)(JSContext *cx, JS::HandleObject obj, JS::HandleObject receiver, JS::HandleId id,
JS::MutableHandleValue vp);
typedef bool
(* PropertyIdOp)(JSContext *cx, JS::HandleObject obj, JS::HandleObject receiver,
JS::Handle<PropertyName*> name, JS::MutableHandleValue vp);
typedef bool
(* ElementIdOp)(JSContext *cx, JS::HandleObject obj, JS::HandleObject receiver, uint32_t index,
JS::MutableHandleValue vp);
typedef bool
(* ElementIfPresentOp)(JSContext *cx, JS::HandleObject obj, JS::HandleObject receiver,
uint32_t index, JS::MutableHandleValue vp, bool* present);
typedef bool
(* SpecialIdOp)(JSContext *cx, JS::HandleObject obj, JS::HandleObject receiver,
HandleSpecialId sid, JS::MutableHandleValue vp);
typedef bool
(* StrictGenericIdOp)(JSContext *cx, JS::HandleObject obj, JS::HandleId id,
JS::MutableHandleValue vp, bool strict);
typedef bool
(* StrictPropertyIdOp)(JSContext *cx, JS::HandleObject obj, JS::Handle<PropertyName*> name,
JS::MutableHandleValue vp, bool strict);
typedef bool
(* StrictElementIdOp)(JSContext *cx, JS::HandleObject obj, uint32_t index,
JS::MutableHandleValue vp, bool strict);
typedef bool
(* StrictSpecialIdOp)(JSContext *cx, JS::HandleObject obj, HandleSpecialId sid,
JS::MutableHandleValue vp, bool strict);
typedef bool
(* GenericAttributesOp)(JSContext *cx, JS::HandleObject obj, JS::HandleId id, unsigned *attrsp);
typedef bool
(* PropertyAttributesOp)(JSContext *cx, JS::HandleObject obj, JS::Handle<PropertyName*> name,
unsigned *attrsp);
typedef bool
(* ElementAttributesOp)(JSContext *cx, JS::HandleObject obj, uint32_t index, unsigned *attrsp);
typedef bool
(* SpecialAttributesOp)(JSContext *cx, JS::HandleObject obj, HandleSpecialId sid, unsigned *attrsp);
typedef bool
(* DeletePropertyOp)(JSContext *cx, JS::HandleObject obj, JS::Handle<PropertyName*> name,
bool *succeeded);
typedef bool
(* DeleteElementOp)(JSContext *cx, JS::HandleObject obj, uint32_t index, bool *succeeded);
typedef bool
(* DeleteSpecialOp)(JSContext *cx, JS::HandleObject obj, HandleSpecialId sid, bool *succeeded);
typedef JSObject *
(* ObjectOp)(JSContext *cx, JS::HandleObject obj);
typedef void
(* FinalizeOp)(FreeOp *fop, JSObject *obj);
#define JS_CLASS_MEMBERS \
const char *name; \
uint32_t flags; \
\
/* Mandatory function pointer members. */ \
JSPropertyOp addProperty; \
JSDeletePropertyOp delProperty; \
JSPropertyOp getProperty; \
JSStrictPropertyOp setProperty; \
JSEnumerateOp enumerate; \
JSResolveOp resolve; \
JSConvertOp convert; \
\
/* Optional members (may be null). */ \
FinalizeOp finalize; \
JSCheckAccessOp checkAccess; \
JSNative call; \
JSHasInstanceOp hasInstance; \
JSNative construct; \
JSTraceOp trace
/*
* The helper struct to measure the size of JS_CLASS_MEMBERS to know how much
* we have to pad js::Class to match the size of JSClass.
*/
struct ClassSizeMeasurement
{
JS_CLASS_MEMBERS;
};
struct ClassExtension
{
JSObjectOp outerObject;
JSObjectOp innerObject;
JSIteratorOp iteratorObject;
/*
* isWrappedNative is true only if the class is an XPCWrappedNative.
* WeakMaps use this to override the wrapper disposal optimization.
*/
bool isWrappedNative;
/*
* If an object is used as a key in a weakmap, it may be desirable for the
* garbage collector to keep that object around longer than it otherwise
* would. A common case is when the key is a wrapper around an object in
* another compartment, and we want to avoid collecting the wrapper (and
* removing the weakmap entry) as long as the wrapped object is alive. In
* that case, the wrapped object is returned by the wrapper's
* weakmapKeyDelegateOp hook. As long as the wrapper is used as a weakmap
* key, it will not be collected (and remain in the weakmap) until the
* wrapped object is collected.
*/
JSWeakmapKeyDelegateOp weakmapKeyDelegateOp;
};
#define JS_NULL_CLASS_EXT {NULL,NULL,NULL,false,NULL}
struct ObjectOps
{
LookupGenericOp lookupGeneric;
LookupPropOp lookupProperty;
LookupElementOp lookupElement;
LookupSpecialOp lookupSpecial;
DefineGenericOp defineGeneric;
DefinePropOp defineProperty;
DefineElementOp defineElement;
DefineSpecialOp defineSpecial;
GenericIdOp getGeneric;
PropertyIdOp getProperty;
ElementIdOp getElement;
ElementIfPresentOp getElementIfPresent; /* can be null */
SpecialIdOp getSpecial;
StrictGenericIdOp setGeneric;
StrictPropertyIdOp setProperty;
StrictElementIdOp setElement;
StrictSpecialIdOp setSpecial;
GenericAttributesOp getGenericAttributes;
PropertyAttributesOp getPropertyAttributes;
ElementAttributesOp getElementAttributes;
SpecialAttributesOp getSpecialAttributes;
GenericAttributesOp setGenericAttributes;
PropertyAttributesOp setPropertyAttributes;
ElementAttributesOp setElementAttributes;
SpecialAttributesOp setSpecialAttributes;
DeletePropertyOp deleteProperty;
DeleteElementOp deleteElement;
DeleteSpecialOp deleteSpecial;
JSNewEnumerateOp enumerate;
ObjectOp thisObject;
};
#define JS_NULL_OBJECT_OPS \
{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL, \
NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL, \
NULL,NULL,NULL}
} // namespace js
// Classes, objects, and properties.
typedef void (*JSClassInternal)();
struct JSClass {
const char *name;
uint32_t flags;
// Mandatory function pointer members.
JSPropertyOp addProperty;
JSDeletePropertyOp delProperty;
JSPropertyOp getProperty;
JSStrictPropertyOp setProperty;
JSEnumerateOp enumerate;
JSResolveOp resolve;
JSConvertOp convert;
// Optional members (may be null).
JSFinalizeOp finalize;
JSCheckAccessOp checkAccess;
JSNative call;
JSHasInstanceOp hasInstance;
JSNative construct;
JSTraceOp trace;
void *reserved[40];
};
#define JSCLASS_HAS_PRIVATE (1<<0) // objects have private slot
#define JSCLASS_NEW_ENUMERATE (1<<1) // has JSNewEnumerateOp hook
#define JSCLASS_NEW_RESOLVE (1<<2) // has JSNewResolveOp hook
#define JSCLASS_PRIVATE_IS_NSISUPPORTS (1<<3) // private is (nsISupports *)
#define JSCLASS_IS_DOMJSCLASS (1<<4) // objects are DOM
#define JSCLASS_IMPLEMENTS_BARRIERS (1<<5) // Correctly implements GC read
// and write barriers
#define JSCLASS_EMULATES_UNDEFINED (1<<6) // objects of this class act
// like the value undefined,
// in some contexts
#define JSCLASS_USERBIT1 (1<<7) // Reserved for embeddings.
// To reserve slots fetched and stored via JS_Get/SetReservedSlot, bitwise-or
// JSCLASS_HAS_RESERVED_SLOTS(n) into the initializer for JSClass.flags, where
// n is a constant in [1, 255]. Reserved slots are indexed from 0 to n-1.
#define JSCLASS_RESERVED_SLOTS_SHIFT 8 // room for 8 flags below */
#define JSCLASS_RESERVED_SLOTS_WIDTH 8 // and 16 above this field */
#define JSCLASS_RESERVED_SLOTS_MASK JS_BITMASK(JSCLASS_RESERVED_SLOTS_WIDTH)
#define JSCLASS_HAS_RESERVED_SLOTS(n) (((n) & JSCLASS_RESERVED_SLOTS_MASK) \
<< JSCLASS_RESERVED_SLOTS_SHIFT)
#define JSCLASS_RESERVED_SLOTS(clasp) (((clasp)->flags \
>> JSCLASS_RESERVED_SLOTS_SHIFT) \
& JSCLASS_RESERVED_SLOTS_MASK)
#define JSCLASS_HIGH_FLAGS_SHIFT (JSCLASS_RESERVED_SLOTS_SHIFT + \
JSCLASS_RESERVED_SLOTS_WIDTH)
#define JSCLASS_IS_ANONYMOUS (1<<(JSCLASS_HIGH_FLAGS_SHIFT+0))
#define JSCLASS_IS_GLOBAL (1<<(JSCLASS_HIGH_FLAGS_SHIFT+1))
#define JSCLASS_INTERNAL_FLAG2 (1<<(JSCLASS_HIGH_FLAGS_SHIFT+2))
#define JSCLASS_INTERNAL_FLAG3 (1<<(JSCLASS_HIGH_FLAGS_SHIFT+3))
// Indicate whether the proto or ctor should be frozen.
#define JSCLASS_FREEZE_PROTO (1<<(JSCLASS_HIGH_FLAGS_SHIFT+4))
#define JSCLASS_FREEZE_CTOR (1<<(JSCLASS_HIGH_FLAGS_SHIFT+5))
// Reserved for embeddings.
#define JSCLASS_USERBIT2 (1<<(JSCLASS_HIGH_FLAGS_SHIFT+6))
#define JSCLASS_USERBIT3 (1<<(JSCLASS_HIGH_FLAGS_SHIFT+7))
#define JSCLASS_BACKGROUND_FINALIZE (1<<(JSCLASS_HIGH_FLAGS_SHIFT+8))
// Bits 26 through 31 are reserved for the CACHED_PROTO_KEY mechanism, see
// below.
// ECMA-262 requires that most constructors used internally create objects
// with "the original Foo.prototype value" as their [[Prototype]] (__proto__)
// member initial value. The "original ... value" verbiage is there because
// in ECMA-262, global properties naming class objects are read/write and
// deleteable, for the most part.
//
// Implementing this efficiently requires that global objects have classes
// with the following flags. Failure to use JSCLASS_GLOBAL_FLAGS was
// prevously allowed, but is now an ES5 violation and thus unsupported.
//
#define JSCLASS_GLOBAL_SLOT_COUNT (JSProto_LIMIT * 3 + 26)
#define JSCLASS_GLOBAL_FLAGS_WITH_SLOTS(n) \
(JSCLASS_IS_GLOBAL | JSCLASS_HAS_RESERVED_SLOTS(JSCLASS_GLOBAL_SLOT_COUNT + (n)))
#define JSCLASS_GLOBAL_FLAGS \
JSCLASS_GLOBAL_FLAGS_WITH_SLOTS(0)
#define JSCLASS_HAS_GLOBAL_FLAG_AND_SLOTS(clasp) \
(((clasp)->flags & JSCLASS_IS_GLOBAL) \
&& JSCLASS_RESERVED_SLOTS(clasp) >= JSCLASS_GLOBAL_SLOT_COUNT)
// Fast access to the original value of each standard class's prototype.
#define JSCLASS_CACHED_PROTO_SHIFT (JSCLASS_HIGH_FLAGS_SHIFT + 10)
#define JSCLASS_CACHED_PROTO_WIDTH 6
#define JSCLASS_CACHED_PROTO_MASK JS_BITMASK(JSCLASS_CACHED_PROTO_WIDTH)
#define JSCLASS_HAS_CACHED_PROTO(key) (uint32_t(key) << JSCLASS_CACHED_PROTO_SHIFT)
#define JSCLASS_CACHED_PROTO_KEY(clasp) ((JSProtoKey) \
(((clasp)->flags \
>> JSCLASS_CACHED_PROTO_SHIFT) \
& JSCLASS_CACHED_PROTO_MASK))
// Initializer for unused members of statically initialized JSClass structs.
#define JSCLASS_NO_INTERNAL_MEMBERS {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
#define JSCLASS_NO_OPTIONAL_MEMBERS 0,0,0,0,0,JSCLASS_NO_INTERNAL_MEMBERS
namespace js {
struct Class
{
JS_CLASS_MEMBERS;
ClassExtension ext;
ObjectOps ops;
uint8_t pad[sizeof(JSClass) - sizeof(ClassSizeMeasurement) -
sizeof(ClassExtension) - sizeof(ObjectOps)];
/* Class is not native and its map is not a scope. */
static const uint32_t NON_NATIVE = JSCLASS_INTERNAL_FLAG2;
bool isNative() const {
return !(flags & NON_NATIVE);
}
bool hasPrivate() const {
return !!(flags & JSCLASS_HAS_PRIVATE);
}
bool emulatesUndefined() const {
return flags & JSCLASS_EMULATES_UNDEFINED;
}
bool isCallable() const {
return this == js::FunctionClassPtr || call;
}
static size_t offsetOfFlags() { return offsetof(Class, flags); }
};
JS_STATIC_ASSERT(offsetof(JSClass, name) == offsetof(Class, name));
JS_STATIC_ASSERT(offsetof(JSClass, flags) == offsetof(Class, flags));
JS_STATIC_ASSERT(offsetof(JSClass, addProperty) == offsetof(Class, addProperty));
JS_STATIC_ASSERT(offsetof(JSClass, delProperty) == offsetof(Class, delProperty));
JS_STATIC_ASSERT(offsetof(JSClass, getProperty) == offsetof(Class, getProperty));
JS_STATIC_ASSERT(offsetof(JSClass, setProperty) == offsetof(Class, setProperty));
JS_STATIC_ASSERT(offsetof(JSClass, enumerate) == offsetof(Class, enumerate));
JS_STATIC_ASSERT(offsetof(JSClass, resolve) == offsetof(Class, resolve));
JS_STATIC_ASSERT(offsetof(JSClass, convert) == offsetof(Class, convert));
JS_STATIC_ASSERT(offsetof(JSClass, finalize) == offsetof(Class, finalize));
JS_STATIC_ASSERT(offsetof(JSClass, checkAccess) == offsetof(Class, checkAccess));
JS_STATIC_ASSERT(offsetof(JSClass, call) == offsetof(Class, call));
JS_STATIC_ASSERT(offsetof(JSClass, construct) == offsetof(Class, construct));
JS_STATIC_ASSERT(offsetof(JSClass, hasInstance) == offsetof(Class, hasInstance));
JS_STATIC_ASSERT(offsetof(JSClass, trace) == offsetof(Class, trace));
JS_STATIC_ASSERT(sizeof(JSClass) == sizeof(Class));
static JS_ALWAYS_INLINE JSClass *
Jsvalify(Class *c)
{
return (JSClass *)c;
}
static JS_ALWAYS_INLINE const JSClass *
Jsvalify(const Class *c)
{
return (const JSClass *)c;
}
static JS_ALWAYS_INLINE Class *
Valueify(JSClass *c)
{
return (Class *)c;
}
static JS_ALWAYS_INLINE const Class *
Valueify(const JSClass *c)
{
return (const Class *)c;
}
/*
* Enumeration describing possible values of the [[Class]] internal property
* value of objects.
*/
enum ESClassValue {
ESClass_Array, ESClass_Number, ESClass_String, ESClass_Boolean,
ESClass_RegExp, ESClass_ArrayBuffer, ESClass_Date
};
/*
* Return whether the given object has the given [[Class]] internal property
* value. Beware, this query says nothing about the js::Class of the JSObject
* so the caller must not assume anything about obj's representation (e.g., obj
* may be a proxy).
*/
inline bool
ObjectClassIs(JSObject &obj, ESClassValue classValue, JSContext *cx);
/* Just a helper that checks v.isObject before calling ObjectClassIs. */
inline bool
IsObjectWithClass(const JS::Value &v, ESClassValue classValue, JSContext *cx);
inline bool
IsPoisonedSpecialId(js::SpecialId iden)
{
if (iden.isObject())
return JS::IsPoisonedPtr(iden.toObject());
return false;
}
template <> struct GCMethods<SpecialId>
{
static SpecialId initial() { return SpecialId(); }
static ThingRootKind kind() { return THING_ROOT_ID; }
static bool poisoned(SpecialId id) { return IsPoisonedSpecialId(id); }
};
} /* namespace js */
#endif /* js_Class_h */

3
js/src/jsapi-tests/testCustomIterator.cpp
View File

@ -2,8 +2,7 @@
* 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/. */
#include "jsclass.h"
#include "js/Class.h"
#include "jsapi-tests/tests.h"
int count = 0;

2
js/src/jsapi-tests/testIntTypesABI.cpp
View File

@ -10,7 +10,6 @@
*/
#include "jsapi.h"
#include "jsclass.h"
#include "jscpucfg.h"
#include "jspubtd.h"
#include "jstypes.h"
@ -18,6 +17,7 @@
#include "js/Anchor.h"
#include "js/CallArgs.h"
#include "js/CharacterEncoding.h"
#include "js/Class.h"
#include "js/Date.h"
#include "js/GCAPI.h"
#include "js/HashTable.h"

320
js/src/jsapi.h
View File

@ -22,6 +22,7 @@
#include "jspubtd.h"
#include "js/CallArgs.h"
#include "js/Class.h"
#include "js/HashTable.h"
#include "js/Id.h"
#include "js/RootingAPI.h"
@ -749,131 +750,6 @@ CallNonGenericMethod(JSContext *cx, IsAcceptableThis Test, NativeImpl Impl, Call
/************************************************************************/
/* JSClass operation signatures. */
/*
* Add or get a property named by id in obj. Note the jsid id type -- id may
* be a string (Unicode property identifier) or an int (element index). The
* *vp out parameter, on success, is the new property value after the action.
*/
typedef bool
(* JSPropertyOp)(JSContext *cx, JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
JS::MutableHandle<JS::Value> vp);
/*
* Set a property named by id in obj, treating the assignment as strict
* mode code if strict is true. Note the jsid id type -- id may be a string
* (Unicode property identifier) or an int (element index). The *vp out
* parameter, on success, is the new property value after the
* set.
*/
typedef bool
(* JSStrictPropertyOp)(JSContext *cx, JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
bool strict, JS::MutableHandle<JS::Value> vp);
/*
* Delete a property named by id in obj.
*
* If an error occurred, return false as per normal JSAPI error practice.
*
* If no error occurred, but the deletion attempt wasn't allowed (perhaps
* because the property was non-configurable), set *succeeded to false and
* return true. This will cause |delete obj[id]| to evaluate to false in
* non-strict mode code, and to throw a TypeError in strict mode code.
*
* If no error occurred and the deletion wasn't disallowed (this is *not* the
* same as saying that a deletion actually occurred -- deleting a non-existent
* property, or an inherited property, is allowed -- it's just pointless),
* set *succeeded to true and return true.
*/
typedef bool
(* JSDeletePropertyOp)(JSContext *cx, JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
bool *succeeded);
/*
* This function type is used for callbacks that enumerate the properties of
* a JSObject. The behavior depends on the value of enum_op:
*
* JSENUMERATE_INIT
* A new, opaque iterator state should be allocated and stored in *statep.
* (You can use PRIVATE_TO_JSVAL() to tag the pointer to be stored).
*
* The number of properties that will be enumerated should be returned as
* an integer jsval in *idp, if idp is non-null, and provided the number of
* enumerable properties is known. If idp is non-null and the number of
* enumerable properties can't be computed in advance, *idp should be set
* to JSVAL_ZERO.
*
* JSENUMERATE_INIT_ALL
* Used identically to JSENUMERATE_INIT, but exposes all properties of the
* object regardless of enumerability.
*
* JSENUMERATE_NEXT
* A previously allocated opaque iterator state is passed in via statep.
* Return the next jsid in the iteration using *idp. The opaque iterator
* state pointed at by statep is destroyed and *statep is set to JSVAL_NULL
* if there are no properties left to enumerate.
*
* JSENUMERATE_DESTROY
* Destroy the opaque iterator state previously allocated in *statep by a
* call to this function when enum_op was JSENUMERATE_INIT or
* JSENUMERATE_INIT_ALL.
*
* The return value is used to indicate success, with a value of false
* indicating failure.
*/
typedef bool
(* JSNewEnumerateOp)(JSContext *cx, JS::Handle<JSObject*> obj, JSIterateOp enum_op,
JS::MutableHandle<JS::Value> statep, JS::MutableHandle<jsid> idp);
/*
* The old-style JSClass.enumerate op should define all lazy properties not
* yet reflected in obj.
*/
typedef bool
(* JSEnumerateOp)(JSContext *cx, JS::Handle<JSObject*> obj);
/*
* Resolve a lazy property named by id in obj by defining it directly in obj.
* Lazy properties are those reflected from some peer native property space
* (e.g., the DOM attributes for a given node reflected as obj) on demand.
*
* JS looks for a property in an object, and if not found, tries to resolve
* the given id. If resolve succeeds, the engine looks again in case resolve
* defined obj[id]. If no such property exists directly in obj, the process
* is repeated with obj's prototype, etc.
*
* NB: JSNewResolveOp provides a cheaper way to resolve lazy properties.
*/
typedef bool
(* JSResolveOp)(JSContext *cx, JS::Handle<JSObject*> obj, JS::Handle<jsid> id);
/*
* Like JSResolveOp, but flags provide contextual information as follows:
*
* JSRESOLVE_ASSIGNING obj[id] is on the left-hand side of an assignment
*
* The *objp out parameter, on success, should be null to indicate that id
* was not resolved; and non-null, referring to obj or one of its prototypes,
* if id was resolved. The hook may assume *objp is null on entry.
*
* This hook instead of JSResolveOp is called via the JSClass.resolve member
* if JSCLASS_NEW_RESOLVE is set in JSClass.flags.
*/
typedef bool
(* JSNewResolveOp)(JSContext *cx, JS::Handle<JSObject*> obj, JS::Handle<jsid> id, unsigned flags,
JS::MutableHandle<JSObject*> objp);
/*
* Convert obj to the given type, returning true with the resulting value in
* *vp on success, and returning false on error or exception.
*/
typedef bool
(* JSConvertOp)(JSContext *cx, JS::Handle<JSObject*> obj, JSType type,
JS::MutableHandle<JS::Value> vp);
typedef struct JSFreeOp JSFreeOp;
struct JSFreeOp {
private:
JSRuntime *runtime_;
@ -888,85 +764,10 @@ struct JSFreeOp {
}
};
/*
* Finalize obj, which the garbage collector has determined to be unreachable
* from other live objects or from GC roots. Obviously, finalizers must never
* store a reference to obj.
*/
typedef void
(* JSFinalizeOp)(JSFreeOp *fop, JSObject *obj);
/*
* Finalizes external strings created by JS_NewExternalString.
*/
typedef struct JSStringFinalizer JSStringFinalizer;
struct JSStringFinalizer {
void (*finalize)(const JSStringFinalizer *fin, jschar *chars);
};
/*
* JSClass.checkAccess type: check whether obj[id] may be accessed per mode,
* returning false on error/exception, true on success with obj[id]'s last-got
* value in *vp, and its attributes in *attrsp. As for JSPropertyOp above, id
* is either a string or an int jsval.
*/
typedef bool
(* JSCheckAccessOp)(JSContext *cx, JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
JSAccessMode mode, JS::MutableHandle<JS::Value> vp);
/*
* Check whether v is an instance of obj. Return false on error or exception,
* true on success with true in *bp if v is an instance of obj, false in
* *bp otherwise.
*/
typedef bool
(* JSHasInstanceOp)(JSContext *cx, JS::Handle<JSObject*> obj, JS::MutableHandle<JS::Value> vp,
bool *bp);
/*
* Function type for trace operation of the class called to enumerate all
* traceable things reachable from obj's private data structure. For each such
* thing, a trace implementation must call one of the JS_Call*Tracer variants
* on the thing.
*
* JSTraceOp implementation can assume that no other threads mutates object
* state. It must not change state of the object or corresponding native
* structures. The only exception for this rule is the case when the embedding
* needs a tight integration with GC. In that case the embedding can check if
* the traversal is a part of the marking phase through calling
* JS_IsGCMarkingTracer and apply a special code like emptying caches or
* marking its native structures.
*/
typedef void
(* JSTraceOp)(JSTracer *trc, JSObject *obj);
/*
* Callback that JSTraceOp implementation can provide to return a string
* describing the reference traced with JS_CallTracer.
*/
typedef void
(* JSTraceNamePrinter)(JSTracer *trc, char *buf, size_t bufsize);
/*
* A generic type for functions mapping an object to another object, or null
* if an error or exception was thrown on cx.
*/
typedef JSObject *
(* JSObjectOp)(JSContext *cx, JS::Handle<JSObject*> obj);
/*
* Hook that creates an iterator object for a given object. Returns the
* iterator object or null if an error or exception was thrown on cx.
*/
typedef JSObject *
(* JSIteratorOp)(JSContext *cx, JS::HandleObject obj, bool keysonly);
typedef JSObject *
(* JSWeakmapKeyDelegateOp)(JSObject *obj);
/* Callbacks and their arguments. */
/************************************************************************/
typedef enum JSContextOp {
JSCONTEXT_NEW,
JSCONTEXT_DESTROY
@ -2673,121 +2474,6 @@ JS_SetNativeStackQuota(JSRuntime *cx, size_t stackSize);
/************************************************************************/
/*
* Classes, objects, and properties.
*/
typedef void (*JSClassInternal)();
struct JSClass {
const char *name;
uint32_t flags;
/* Mandatory function pointer members. */
JSPropertyOp addProperty;
JSDeletePropertyOp delProperty;
JSPropertyOp getProperty;
JSStrictPropertyOp setProperty;
JSEnumerateOp enumerate;
JSResolveOp resolve;
JSConvertOp convert;
/* Optional members (may be null). */
JSFinalizeOp finalize;
JSCheckAccessOp checkAccess;
JSNative call;
JSHasInstanceOp hasInstance;
JSNative construct;
JSTraceOp trace;
void *reserved[40];
};
#define JSCLASS_HAS_PRIVATE (1<<0) /* objects have private slot */
#define JSCLASS_NEW_ENUMERATE (1<<1) /* has JSNewEnumerateOp hook */
#define JSCLASS_NEW_RESOLVE (1<<2) /* has JSNewResolveOp hook */
#define JSCLASS_PRIVATE_IS_NSISUPPORTS (1<<3) /* private is (nsISupports *) */
#define JSCLASS_IS_DOMJSCLASS (1<<4) /* objects are DOM */
#define JSCLASS_IMPLEMENTS_BARRIERS (1<<5) /* Correctly implements GC read
and write barriers */
#define JSCLASS_EMULATES_UNDEFINED (1<<6) /* objects of this class act
like the value undefined,
in some contexts */
#define JSCLASS_USERBIT1 (1<<7) /* Reserved for embeddings. */
/*
* To reserve slots fetched and stored via JS_Get/SetReservedSlot, bitwise-or
* JSCLASS_HAS_RESERVED_SLOTS(n) into the initializer for JSClass.flags, where
* n is a constant in [1, 255]. Reserved slots are indexed from 0 to n-1.
*/
#define JSCLASS_RESERVED_SLOTS_SHIFT 8 /* room for 8 flags below */
#define JSCLASS_RESERVED_SLOTS_WIDTH 8 /* and 16 above this field */
#define JSCLASS_RESERVED_SLOTS_MASK JS_BITMASK(JSCLASS_RESERVED_SLOTS_WIDTH)
#define JSCLASS_HAS_RESERVED_SLOTS(n) (((n) & JSCLASS_RESERVED_SLOTS_MASK) \
<< JSCLASS_RESERVED_SLOTS_SHIFT)
#define JSCLASS_RESERVED_SLOTS(clasp) (((clasp)->flags \
>> JSCLASS_RESERVED_SLOTS_SHIFT) \
& JSCLASS_RESERVED_SLOTS_MASK)
#define JSCLASS_HIGH_FLAGS_SHIFT (JSCLASS_RESERVED_SLOTS_SHIFT + \
JSCLASS_RESERVED_SLOTS_WIDTH)
#define JSCLASS_IS_ANONYMOUS (1<<(JSCLASS_HIGH_FLAGS_SHIFT+0))
#define JSCLASS_IS_GLOBAL (1<<(JSCLASS_HIGH_FLAGS_SHIFT+1))
#define JSCLASS_INTERNAL_FLAG2 (1<<(JSCLASS_HIGH_FLAGS_SHIFT+2))
#define JSCLASS_INTERNAL_FLAG3 (1<<(JSCLASS_HIGH_FLAGS_SHIFT+3))
/* Indicate whether the proto or ctor should be frozen. */
#define JSCLASS_FREEZE_PROTO (1<<(JSCLASS_HIGH_FLAGS_SHIFT+4))
#define JSCLASS_FREEZE_CTOR (1<<(JSCLASS_HIGH_FLAGS_SHIFT+5))
/* Reserved for embeddings. */
#define JSCLASS_USERBIT2 (1<<(JSCLASS_HIGH_FLAGS_SHIFT+6))
#define JSCLASS_USERBIT3 (1<<(JSCLASS_HIGH_FLAGS_SHIFT+7))
#define JSCLASS_BACKGROUND_FINALIZE (1<<(JSCLASS_HIGH_FLAGS_SHIFT+8))
/*
* Bits 26 through 31 are reserved for the CACHED_PROTO_KEY mechanism, see
* below.
*/
/* Global flags. */
#define JSGLOBAL_FLAGS_CLEARED 0x1
/*
* ECMA-262 requires that most constructors used internally create objects
* with "the original Foo.prototype value" as their [[Prototype]] (__proto__)
* member initial value. The "original ... value" verbiage is there because
* in ECMA-262, global properties naming class objects are read/write and
* deleteable, for the most part.
*
* Implementing this efficiently requires that global objects have classes
* with the following flags. Failure to use JSCLASS_GLOBAL_FLAGS was
* prevously allowed, but is now an ES5 violation and thus unsupported.
*/
#define JSCLASS_GLOBAL_SLOT_COUNT (JSProto_LIMIT * 3 + 26)
#define JSCLASS_GLOBAL_FLAGS_WITH_SLOTS(n) \
(JSCLASS_IS_GLOBAL | JSCLASS_HAS_RESERVED_SLOTS(JSCLASS_GLOBAL_SLOT_COUNT + (n)))
#define JSCLASS_GLOBAL_FLAGS \
JSCLASS_GLOBAL_FLAGS_WITH_SLOTS(0)
#define JSCLASS_HAS_GLOBAL_FLAG_AND_SLOTS(clasp) \
(((clasp)->flags & JSCLASS_IS_GLOBAL) \
&& JSCLASS_RESERVED_SLOTS(clasp) >= JSCLASS_GLOBAL_SLOT_COUNT)
/* Fast access to the original value of each standard class's prototype. */
#define JSCLASS_CACHED_PROTO_SHIFT (JSCLASS_HIGH_FLAGS_SHIFT + 10)
#define JSCLASS_CACHED_PROTO_WIDTH 6
#define JSCLASS_CACHED_PROTO_MASK JS_BITMASK(JSCLASS_CACHED_PROTO_WIDTH)
#define JSCLASS_HAS_CACHED_PROTO(key) (uint32_t(key) << JSCLASS_CACHED_PROTO_SHIFT)
#define JSCLASS_CACHED_PROTO_KEY(clasp) ((JSProtoKey) \
(((clasp)->flags \
>> JSCLASS_CACHED_PROTO_SHIFT) \
& JSCLASS_CACHED_PROTO_MASK))
/* Initializer for unused members of statically initialized JSClass structs. */
#define JSCLASS_NO_INTERNAL_MEMBERS {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
#define JSCLASS_NO_OPTIONAL_MEMBERS 0,0,0,0,0,JSCLASS_NO_INTERNAL_MEMBERS
extern JS_PUBLIC_API(int)
JS_IdArrayLength(JSContext *cx, JSIdArray *ida);

408
js/src/jsclass.h
View File

@ -1,408 +0,0 @@
/* -*- 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 jsclass_h
#define jsclass_h
/*
* A JSClass acts as a vtable for JS objects that allows JSAPI clients to
* control various aspects of the behavior of an object like property lookup.
* js::Class is an engine-private extension that allows more control over
* object behavior and, e.g., allows custom slow layout.
*/
#include "jsapi.h"
namespace js {
class Class;
class FreeOp;
class PropertyId;
class PropertyName;
class Shape;
class SpecialId;
// This is equal to JSFunction::class_. Use it in places where you don't want
// to #include jsfun.h.
extern JS_FRIEND_DATA(js::Class* const) FunctionClassPtr;
static JS_ALWAYS_INLINE jsid
SPECIALID_TO_JSID(const SpecialId &sid);
/*
* We partition the ways to refer to a property into three: by an index
* (uint32_t); by a string whose characters do not represent an index
* (PropertyName, see vm/String.h); and by various special values.
*
* Special values are encoded using SpecialId, which is layout-compatible but
* non-interconvertible with jsid. A SpecialId is used for JSID_VOID, which
* does not occur in JS scripts but may be used to indicate the absence of a
* valid identifier. In the future, a SpecialId may also be an object used by
* Harmony-proposed private names.
*/
class SpecialId
{
uintptr_t bits_;
/* Needs access to raw bits. */
friend JS_ALWAYS_INLINE jsid SPECIALID_TO_JSID(const SpecialId &sid);
friend class PropertyId;
static const uintptr_t TYPE_VOID = JSID_TYPE_VOID;
static const uintptr_t TYPE_OBJECT = JSID_TYPE_OBJECT;
static const uintptr_t TYPE_MASK = JSID_TYPE_MASK;
SpecialId(uintptr_t bits) : bits_(bits) { }
public:
SpecialId() : bits_(TYPE_VOID) { }
/* Object-valued */
SpecialId(JSObject &obj)
: bits_(uintptr_t(&obj) | TYPE_OBJECT)
{
JS_ASSERT(&obj != NULL);
JS_ASSERT((uintptr_t(&obj) & TYPE_MASK) == 0);
}
bool isObject() const {
return (bits_ & TYPE_MASK) == TYPE_OBJECT && bits_ != TYPE_OBJECT;
}
JSObject *toObject() const {
JS_ASSERT(isObject());
return reinterpret_cast<JSObject *>(bits_ & ~TYPE_MASK);
}
/* Empty */
static SpecialId empty() {
SpecialId sid(TYPE_OBJECT);
JS_ASSERT(sid.isEmpty());
return sid;
}
bool isEmpty() const {
return bits_ == TYPE_OBJECT;
}
/* Void */
static SpecialId voidId() {
SpecialId sid(TYPE_VOID);
JS_ASSERT(sid.isVoid());
return sid;
}
bool isVoid() const {
return bits_ == TYPE_VOID;
}
};
static JS_ALWAYS_INLINE jsid
SPECIALID_TO_JSID(const SpecialId &sid)
{
jsid id;
JSID_BITS(id) = sid.bits_;
JS_ASSERT_IF(sid.isObject(), JSID_IS_OBJECT(id) && JSID_TO_OBJECT(id) == sid.toObject());
JS_ASSERT_IF(sid.isVoid(), JSID_IS_VOID(id));
JS_ASSERT_IF(sid.isEmpty(), JSID_IS_EMPTY(id));
return id;
}
static JS_ALWAYS_INLINE bool
JSID_IS_SPECIAL(jsid id)
{
return JSID_IS_OBJECT(id) || JSID_IS_EMPTY(id) || JSID_IS_VOID(id);
}
static JS_ALWAYS_INLINE SpecialId
JSID_TO_SPECIALID(jsid id)
{
JS_ASSERT(JSID_IS_SPECIAL(id));
if (JSID_IS_OBJECT(id))
return SpecialId(*JSID_TO_OBJECT(id));
if (JSID_IS_EMPTY(id))
return SpecialId::empty();
JS_ASSERT(JSID_IS_VOID(id));
return SpecialId::voidId();
}
typedef JS::Handle<SpecialId> HandleSpecialId;
/* js::Class operation signatures. */
typedef bool
(* LookupGenericOp)(JSContext *cx, HandleObject obj, HandleId id,
MutableHandleObject objp, JS::MutableHandle<Shape*> propp);
typedef bool
(* LookupPropOp)(JSContext *cx, HandleObject obj, JS::Handle<PropertyName*> name,
MutableHandleObject objp, JS::MutableHandle<Shape*> propp);
typedef bool
(* LookupElementOp)(JSContext *cx, HandleObject obj, uint32_t index,
MutableHandleObject objp, JS::MutableHandle<Shape*> propp);
typedef bool
(* LookupSpecialOp)(JSContext *cx, HandleObject obj, HandleSpecialId sid,
MutableHandleObject objp, JS::MutableHandle<Shape*> propp);
typedef bool
(* DefineGenericOp)(JSContext *cx, HandleObject obj, HandleId id, HandleValue value,
JSPropertyOp getter, JSStrictPropertyOp setter, unsigned attrs);
typedef bool
(* DefinePropOp)(JSContext *cx, HandleObject obj, JS::Handle<PropertyName*> name, HandleValue value,
JSPropertyOp getter, JSStrictPropertyOp setter, unsigned attrs);
typedef bool
(* DefineElementOp)(JSContext *cx, HandleObject obj, uint32_t index, HandleValue value,
JSPropertyOp getter, JSStrictPropertyOp setter, unsigned attrs);
typedef bool
(* DefineSpecialOp)(JSContext *cx, HandleObject obj, HandleSpecialId sid, HandleValue value,
JSPropertyOp getter, JSStrictPropertyOp setter, unsigned attrs);
typedef bool
(* GenericIdOp)(JSContext *cx, HandleObject obj, HandleObject receiver, HandleId id, MutableHandleValue vp);
typedef bool
(* PropertyIdOp)(JSContext *cx, HandleObject obj, HandleObject receiver, JS::Handle<PropertyName*> name, MutableHandleValue vp);
typedef bool
(* ElementIdOp)(JSContext *cx, HandleObject obj, HandleObject receiver, uint32_t index, MutableHandleValue vp);
typedef bool
(* ElementIfPresentOp)(JSContext *cx, HandleObject obj, HandleObject receiver, uint32_t index, MutableHandleValue vp, bool* present);
typedef bool
(* SpecialIdOp)(JSContext *cx, HandleObject obj, HandleObject receiver, HandleSpecialId sid, MutableHandleValue vp);
typedef bool
(* StrictGenericIdOp)(JSContext *cx, HandleObject obj, HandleId id, MutableHandleValue vp, bool strict);
typedef bool
(* StrictPropertyIdOp)(JSContext *cx, HandleObject obj, JS::Handle<PropertyName*> name, MutableHandleValue vp, bool strict);
typedef bool
(* StrictElementIdOp)(JSContext *cx, HandleObject obj, uint32_t index, MutableHandleValue vp, bool strict);
typedef bool
(* StrictSpecialIdOp)(JSContext *cx, HandleObject obj, HandleSpecialId sid, MutableHandleValue vp, bool strict);
typedef bool
(* GenericAttributesOp)(JSContext *cx, HandleObject obj, HandleId id, unsigned *attrsp);
typedef bool
(* PropertyAttributesOp)(JSContext *cx, HandleObject obj, JS::Handle<PropertyName*> name, unsigned *attrsp);
typedef bool
(* ElementAttributesOp)(JSContext *cx, HandleObject obj, uint32_t index, unsigned *attrsp);
typedef bool
(* SpecialAttributesOp)(JSContext *cx, HandleObject obj, HandleSpecialId sid, unsigned *attrsp);
typedef bool
(* DeletePropertyOp)(JSContext *cx, HandleObject obj, JS::Handle<PropertyName*> name, bool *succeeded);
typedef bool
(* DeleteElementOp)(JSContext *cx, HandleObject obj, uint32_t index, bool *succeeded);
typedef bool
(* DeleteSpecialOp)(JSContext *cx, HandleObject obj, HandleSpecialId sid, bool *succeeded);
typedef JSObject *
(* ObjectOp)(JSContext *cx, HandleObject obj);
typedef void
(* FinalizeOp)(FreeOp *fop, JSObject *obj);
#define JS_CLASS_MEMBERS \
const char *name; \
uint32_t flags; \
\
/* Mandatory function pointer members. */ \
JSPropertyOp addProperty; \
JSDeletePropertyOp delProperty; \
JSPropertyOp getProperty; \
JSStrictPropertyOp setProperty; \
JSEnumerateOp enumerate; \
JSResolveOp resolve; \
JSConvertOp convert; \
\
/* Optional members (may be null). */ \
FinalizeOp finalize; \
JSCheckAccessOp checkAccess; \
JSNative call; \
JSHasInstanceOp hasInstance; \
JSNative construct; \
JSTraceOp trace
/*
* The helper struct to measure the size of JS_CLASS_MEMBERS to know how much
* we have to pad js::Class to match the size of JSClass.
*/
struct ClassSizeMeasurement
{
JS_CLASS_MEMBERS;
};
struct ClassExtension
{
JSObjectOp outerObject;
JSObjectOp innerObject;
JSIteratorOp iteratorObject;
/*
* isWrappedNative is true only if the class is an XPCWrappedNative.
* WeakMaps use this to override the wrapper disposal optimization.
*/
bool isWrappedNative;
/*
* If an object is used as a key in a weakmap, it may be desirable for the
* garbage collector to keep that object around longer than it otherwise
* would. A common case is when the key is a wrapper around an object in
* another compartment, and we want to avoid collecting the wrapper (and
* removing the weakmap entry) as long as the wrapped object is alive. In
* that case, the wrapped object is returned by the wrapper's
* weakmapKeyDelegateOp hook. As long as the wrapper is used as a weakmap
* key, it will not be collected (and remain in the weakmap) until the
* wrapped object is collected.
*/
JSWeakmapKeyDelegateOp weakmapKeyDelegateOp;
};
#define JS_NULL_CLASS_EXT {NULL,NULL,NULL,false,NULL}
struct ObjectOps
{
LookupGenericOp lookupGeneric;
LookupPropOp lookupProperty;
LookupElementOp lookupElement;
LookupSpecialOp lookupSpecial;
DefineGenericOp defineGeneric;
DefinePropOp defineProperty;
DefineElementOp defineElement;
DefineSpecialOp defineSpecial;
GenericIdOp getGeneric;
PropertyIdOp getProperty;
ElementIdOp getElement;
ElementIfPresentOp getElementIfPresent; /* can be null */
SpecialIdOp getSpecial;
StrictGenericIdOp setGeneric;
StrictPropertyIdOp setProperty;
StrictElementIdOp setElement;
StrictSpecialIdOp setSpecial;
GenericAttributesOp getGenericAttributes;
PropertyAttributesOp getPropertyAttributes;
ElementAttributesOp getElementAttributes;
SpecialAttributesOp getSpecialAttributes;
GenericAttributesOp setGenericAttributes;
PropertyAttributesOp setPropertyAttributes;
ElementAttributesOp setElementAttributes;
SpecialAttributesOp setSpecialAttributes;
DeletePropertyOp deleteProperty;
DeleteElementOp deleteElement;
DeleteSpecialOp deleteSpecial;
JSNewEnumerateOp enumerate;
ObjectOp thisObject;
};
#define JS_NULL_OBJECT_OPS \
{NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL, \
NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL, \
NULL,NULL,NULL}
struct Class
{
JS_CLASS_MEMBERS;
ClassExtension ext;
ObjectOps ops;
uint8_t pad[sizeof(JSClass) - sizeof(ClassSizeMeasurement) -
sizeof(ClassExtension) - sizeof(ObjectOps)];
/* Class is not native and its map is not a scope. */
static const uint32_t NON_NATIVE = JSCLASS_INTERNAL_FLAG2;
bool isNative() const {
return !(flags & NON_NATIVE);
}
bool hasPrivate() const {
return !!(flags & JSCLASS_HAS_PRIVATE);
}
bool emulatesUndefined() const {
return flags & JSCLASS_EMULATES_UNDEFINED;
}
bool isCallable() const {
return this == js::FunctionClassPtr || call;
}
static size_t offsetOfFlags() { return offsetof(Class, flags); }
};
JS_STATIC_ASSERT(offsetof(JSClass, name) == offsetof(Class, name));
JS_STATIC_ASSERT(offsetof(JSClass, flags) == offsetof(Class, flags));
JS_STATIC_ASSERT(offsetof(JSClass, addProperty) == offsetof(Class, addProperty));
JS_STATIC_ASSERT(offsetof(JSClass, delProperty) == offsetof(Class, delProperty));
JS_STATIC_ASSERT(offsetof(JSClass, getProperty) == offsetof(Class, getProperty));
JS_STATIC_ASSERT(offsetof(JSClass, setProperty) == offsetof(Class, setProperty));
JS_STATIC_ASSERT(offsetof(JSClass, enumerate) == offsetof(Class, enumerate));
JS_STATIC_ASSERT(offsetof(JSClass, resolve) == offsetof(Class, resolve));
JS_STATIC_ASSERT(offsetof(JSClass, convert) == offsetof(Class, convert));
JS_STATIC_ASSERT(offsetof(JSClass, finalize) == offsetof(Class, finalize));
JS_STATIC_ASSERT(offsetof(JSClass, checkAccess) == offsetof(Class, checkAccess));
JS_STATIC_ASSERT(offsetof(JSClass, call) == offsetof(Class, call));
JS_STATIC_ASSERT(offsetof(JSClass, construct) == offsetof(Class, construct));
JS_STATIC_ASSERT(offsetof(JSClass, hasInstance) == offsetof(Class, hasInstance));
JS_STATIC_ASSERT(offsetof(JSClass, trace) == offsetof(Class, trace));
JS_STATIC_ASSERT(sizeof(JSClass) == sizeof(Class));
static JS_ALWAYS_INLINE JSClass *
Jsvalify(Class *c)
{
return (JSClass *)c;
}
static JS_ALWAYS_INLINE const JSClass *
Jsvalify(const Class *c)
{
return (const JSClass *)c;
}
static JS_ALWAYS_INLINE Class *
Valueify(JSClass *c)
{
return (Class *)c;
}
static JS_ALWAYS_INLINE const Class *
Valueify(const JSClass *c)
{
return (const Class *)c;
}
/*
* Enumeration describing possible values of the [[Class]] internal property
* value of objects.
*/
enum ESClassValue {
ESClass_Array, ESClass_Number, ESClass_String, ESClass_Boolean,
ESClass_RegExp, ESClass_ArrayBuffer, ESClass_Date
};
/*
* Return whether the given object has the given [[Class]] internal property
* value. Beware, this query says nothing about the js::Class of the JSObject
* so the caller must not assume anything about obj's representation (e.g., obj
* may be a proxy).
*/
inline bool
ObjectClassIs(JSObject &obj, ESClassValue classValue, JSContext *cx);
/* Just a helper that checks v.isObject before calling ObjectClassIs. */
inline bool
IsObjectWithClass(const Value &v, ESClassValue classValue, JSContext *cx);
inline bool
IsPoisonedSpecialId(js::SpecialId iden)
{
if (iden.isObject())
return IsPoisonedPtr(iden.toObject());
return false;
}
template <> struct GCMethods<SpecialId>
{
static SpecialId initial() { return SpecialId(); }
static ThingRootKind kind() { return THING_ROOT_ID; }
static bool poisoned(SpecialId id) { return IsPoisonedSpecialId(id); }
};
} /* namespace js */
#endif /* jsclass_h */

2
js/src/jsfriendapi.h
View File

@ -11,8 +11,8 @@
#include "mozilla/MemoryReporting.h"
#endif
#include "jsapi.h"
#include "jsbytecode.h"
#include "jsclass.h"
#include "jspubtd.h"
#include "js/CallArgs.h"

2
js/src/jsproxy.h
View File

@ -149,7 +149,7 @@ class JS_FRIEND_API(BaseProxyHandler)
uint32_t index, MutableHandleValue vp, bool *present);
virtual bool getPrototypeOf(JSContext *cx, HandleObject proxy, MutableHandleObject protop);
/* See comment for weakmapKeyDelegateOp in jsclass.h. */
/* See comment for weakmapKeyDelegateOp in js/Class.h. */
virtual JSObject *weakmapKeyDelegate(JSObject *proxy);
};

2
js/src/moz.build
View File

@ -35,7 +35,6 @@ EXPORTS += [
'jsalloc.h',
'jsapi.h',
'jsbytecode.h',
'jsclass.h',
'jsclist.h',
'jscpucfg.h',
'jsdbgapi.h',
@ -62,6 +61,7 @@ EXPORTS.js += [
'../public/Anchor.h',
'../public/CallArgs.h',
'../public/CharacterEncoding.h',
'../public/Class.h',
'../public/Date.h',
'../public/GCAPI.h',
'../public/HashTable.h',

3
js/src/vm/TypedArrayObject.h
View File

@ -8,9 +8,10 @@
#define vm_TypedArrayObject_h
#include "jsapi.h"
#include "jsclass.h"
#include "jsobj.h"
#include "js/Class.h"
typedef struct JSProperty JSProperty;
namespace js {

2
xpcom/base/CycleCollectedJSRuntime.h
View File

@ -9,7 +9,7 @@
#include "mozilla/MemoryReporting.h"
#include "jsapi.h"
#include "jsclass.h"
#include "js/Class.h"
#include "nsCycleCollector.h"
#include "nsCycleCollectionParticipant.h"