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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** 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 jsarray_h___
#define jsarray_h___
/*
* JS Array interface.
*/
#include "jsprvtd.h"
#include "jspubtd.h"
#include "jsobj.h"
JS_BEGIN_EXTERN_C
#define ARRAY_CAPACITY_MIN 7
extern JSBool
js_IdIsIndex(jsval id, jsuint *indexp);
extern JSClass js_ArrayClass, js_SlowArrayClass;
inline bool
JSObject::isDenseArray() const
{
return getClass() == &js_ArrayClass;
}
inline bool
JSObject::isArray() const
{
return isDenseArray() || getClass() == &js_SlowArrayClass;
}
#define OBJ_IS_DENSE_ARRAY(cx,obj) (obj)->isDenseArray()
#define OBJ_IS_ARRAY(cx,obj) (obj)->isArray()
/*
* Dense arrays are not native (OBJ_IS_NATIVE(cx, aobj) for a dense array aobj
* results in false, meaning aobj->map does not point to a JSScope).
*
* But Array methods are called via aobj.sort(), e.g., and the interpreter and
* the trace recorder must consult the property cache in order to perform well.
* The cache works only for native objects.
*
* Therefore the interpreter (js_Interpret in JSOP_GETPROP and JSOP_CALLPROP)
* and js_GetPropertyHelper use this inline function to skip up one link in the
* prototype chain when obj is a dense array, in order to find a native object
* (to wit, Array.prototype) in which to probe for cached methods.
*
* Note that setting aobj.__proto__ for a dense array aobj turns aobj into a
* slow array, avoiding the neede to skip.
*
* Callers of js_GetProtoIfDenseArray must take care to use the original object
* (obj) for the |this| value of a getter, setter, or method call (bug 476447).
*/
static JS_INLINE JSObject *
js_GetProtoIfDenseArray(JSContext *cx, JSObject *obj)
{
return OBJ_IS_DENSE_ARRAY(cx, obj) ? OBJ_GET_PROTO(cx, obj) : obj;
}
extern JSObject *
js_InitArrayClass(JSContext *cx, JSObject *obj);
extern bool
js_InitContextBusyArrayTable(JSContext *cx);
/*
* Creates a new array with the given length and proto (NB: NULL is not
* translated to Array.prototype), with len slots preallocated.
*/
extern JSObject * JS_FASTCALL
js_NewArrayWithSlots(JSContext* cx, JSObject* proto, uint32 len);
extern JSObject *
js_NewArrayObject(JSContext *cx, jsuint length, jsval *vector,
JSBool holey = JS_FALSE);
/* Create an array object that starts out already made slow/sparse. */
extern JSObject *
js_NewSlowArrayObject(JSContext *cx);
extern JSBool
js_MakeArraySlow(JSContext *cx, JSObject *obj);
#define JSSLOT_ARRAY_LENGTH JSSLOT_PRIVATE
#define JSSLOT_ARRAY_COUNT (JSSLOT_ARRAY_LENGTH + 1)
#define JSSLOT_ARRAY_UNUSED (JSSLOT_ARRAY_COUNT + 1)
static JS_INLINE uint32
js_DenseArrayCapacity(JSObject *obj)
{
JS_ASSERT(obj->isDenseArray());
return obj->dslots ? (uint32) obj->dslots[-1] : 0;
}
static JS_INLINE void
js_SetDenseArrayCapacity(JSObject *obj, uint32 capacity)
{
JS_ASSERT(obj->isDenseArray());
JS_ASSERT(obj->dslots);
obj->dslots[-1] = (jsval) capacity;
}
extern JSBool
js_GetLengthProperty(JSContext *cx, JSObject *obj, jsuint *lengthp);
extern JSBool
js_SetLengthProperty(JSContext *cx, JSObject *obj, jsdouble length);
extern JSBool
js_HasLengthProperty(JSContext *cx, JSObject *obj, jsuint *lengthp);
extern JSBool JS_FASTCALL
js_IndexToId(JSContext *cx, jsuint index, jsid *idp);
/*
* Test whether an object is "array-like". Currently this means whether obj
* is an Array or an arguments object. We would like an API, and probably a
* way in the language, to bless other objects as array-like: having indexed
* properties, and a 'length' property of uint32 value equal to one more than
* the greatest index.
*/
extern JSBool
js_IsArrayLike(JSContext *cx, JSObject *obj, JSBool *answerp, jsuint *lengthp);
/*
* JS-specific merge sort function.
*/
typedef JSBool (*JSComparator)(void *arg, const void *a, const void *b,
int *result);
/*
* NB: vec is the array to be sorted, tmp is temporary space at least as big
* as vec. Both should be GC-rooted if appropriate.
*
* The sorted result is in vec. vec may be in an inconsistent state if the
* comparator function cmp returns an error inside a comparison, so remember
* to check the return value of this function.
*/
extern JSBool
js_MergeSort(void *vec, size_t nel, size_t elsize, JSComparator cmp,
void *arg, void *tmp);
#ifdef DEBUG_ARRAYS
extern JSBool
js_ArrayInfo(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval);
#endif
extern JSBool JS_FASTCALL
js_ArrayCompPush(JSContext *cx, JSObject *obj, jsval v);
/*
* Fast dense-array-to-buffer conversion for use by canvas.
*
* If the array is a dense array, fill [offset..offset+count] values into
* destination, assuming that types are consistent. Return JS_TRUE if
* successful, otherwise JS_FALSE -- note that the destination buffer may be
* modified even if JS_FALSE is returned (e.g. due to finding an inappropriate
* type later on in the array). If JS_FALSE is returned, no error conditions
* or exceptions are set on the context.
*
* This method succeeds if each element of the array is an integer or a double.
* Values outside the 0-255 range are clamped to that range. Double values are
* converted to integers in this range by clamping and then rounding to
* nearest, ties to even.
*/
JS_FRIEND_API(JSBool)
js_CoerceArrayToCanvasImageData(JSObject *obj, jsuint offset, jsuint count,
JSUint8 *dest);
JSBool
js_PrototypeHasIndexedProperties(JSContext *cx, JSObject *obj);
/*
* Utility to access the value from the id returned by array_lookupProperty.
*/
JSBool
js_GetDenseArrayElementValue(JSContext *cx, JSObject *obj, JSProperty *prop,
jsval *vp);
/* Array constructor native. Exposed only so the JIT can know its address. */
JSBool
js_Array(JSContext* cx, JSObject* obj, uintN argc, jsval* argv, jsval* rval);
/*
* Friend api function that allows direct creation of an array object with a
* given capacity. Non-null return value means allocation of the internal
* buffer for a capacity of at least |capacity| succeeded. A pointer to the
* first element of this internal buffer is returned in the |vector| out
* parameter. The caller promises to fill in the first |capacity| values
* starting from that pointer immediately after this function returns and
* without triggering GC (so this method is allowed to leave those
* uninitialized) and to set them to non-JSVAL_HOLE values, so that the
* resulting array has length and count both equal to |capacity|.
*/
JS_FRIEND_API(JSObject *)
js_NewArrayObjectWithCapacity(JSContext *cx, jsuint capacity, jsval **vector);
JS_END_EXTERN_C
#endif /* jsarray_h___ */
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