/usr/include/js/jsarray.h is in libmozjs185-dev 1.8.5-1.0.0+dfsg-4.5.
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*
* ***** 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 "jsatom.h"
#include "jsobj.h"
#include "jsstr.h"
/* Small arrays are dense, no matter what. */
const uintN MIN_SPARSE_INDEX = 256;
inline JSObject::EnsureDenseResult
JSObject::ensureDenseArrayElements(JSContext *cx, uintN index, uintN extra)
{
JS_ASSERT(isDenseArray());
uintN currentCapacity = numSlots();
uintN requiredCapacity;
if (extra == 1) {
/* Optimize for the common case. */
if (index < currentCapacity)
return ED_OK;
requiredCapacity = index + 1;
if (requiredCapacity == 0) {
/* Overflow. */
return ED_SPARSE;
}
} else {
requiredCapacity = index + extra;
if (requiredCapacity < index) {
/* Overflow. */
return ED_SPARSE;
}
if (requiredCapacity <= currentCapacity)
return ED_OK;
}
/*
* We use the extra argument also as a hint about number of non-hole
* elements to be inserted.
*/
if (requiredCapacity > MIN_SPARSE_INDEX &&
willBeSparseDenseArray(requiredCapacity, extra)) {
return ED_SPARSE;
}
return growSlots(cx, requiredCapacity) ? ED_OK : ED_FAILED;
}
extern bool
js_StringIsIndex(JSLinearString *str, jsuint *indexp);
inline JSBool
js_IdIsIndex(jsid id, jsuint *indexp)
{
if (JSID_IS_INT(id)) {
jsint i;
i = JSID_TO_INT(id);
if (i < 0)
return JS_FALSE;
*indexp = (jsuint)i;
return JS_TRUE;
}
if (JS_UNLIKELY(!JSID_IS_STRING(id)))
return JS_FALSE;
return js_StringIsIndex(JSID_TO_ATOM(id), indexp);
}
/* XML really wants to pretend jsvals are jsids. */
inline bool
js_IdValIsIndex(JSContext *cx, jsval id, jsuint *indexp, bool *isIndex)
{
if (JSVAL_IS_INT(id)) {
jsint i;
i = JSVAL_TO_INT(id);
if (i < 0) {
*isIndex = false;
return true;
}
*indexp = (jsuint)i;
*isIndex = true;
return true;
}
if (!JSVAL_IS_STRING(id)) {
*isIndex = false;
return true;
}
JSLinearString *str = JSVAL_TO_STRING(id)->ensureLinear(cx);
if (!str)
return false;
*isIndex = js_StringIsIndex(str, indexp);
return true;
}
extern js::Class js_ArrayClass, js_SlowArrayClass;
inline bool
JSObject::isDenseArray() const
{
return getClass() == &js_ArrayClass;
}
inline bool
JSObject::isSlowArray() const
{
return getClass() == &js_SlowArrayClass;
}
inline bool
JSObject::isArray() const
{
return isDenseArray() || isSlowArray();
}
/*
* Dense arrays are not native -- aobj->isNative() for a dense array aobj
* results in false, meaning aobj->map does not point to a js::Shape.
*
* 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(JSObject *obj)
{
return obj->isDenseArray() ? obj->getProto() : obj;
}
extern JSObject *
js_InitArrayClass(JSContext *cx, JSObject *obj);
extern bool
js_InitContextBusyArrayTable(JSContext *cx);
namespace js
{
/* Create a dense array with no capacity allocated, length set to 0. */
extern JSObject * JS_FASTCALL
NewDenseEmptyArray(JSContext *cx, JSObject *proto=NULL);
/* Create a dense array with length and capacity == 'length'. */
extern JSObject * JS_FASTCALL
NewDenseAllocatedArray(JSContext *cx, uint length, JSObject *proto=NULL);
/*
* Create a dense array with a set length, but without allocating space for the
* contents. This is useful, e.g., when accepting length from the user.
*/
extern JSObject * JS_FASTCALL
NewDenseUnallocatedArray(JSContext *cx, uint length, JSObject *proto=NULL);
/* Create a dense array with a copy of vp. */
extern JSObject *
NewDenseCopiedArray(JSContext *cx, uint length, Value *vp, JSObject *proto=NULL);
/* Create a sparse array. */
extern JSObject *
NewSlowEmptyArray(JSContext *cx);
}
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);
namespace js {
/*
* This function assumes 'length' is effectively the result of calling
* js_GetLengthProperty on aobj.
*/
extern bool
GetElements(JSContext *cx, JSObject *aobj, jsuint length, js::Value *vp);
}
/*
* JS-specific merge sort function.
*/
typedef JSBool (*JSComparator)(void *arg, const void *a, const void *b,
int *result);
enum JSMergeSortElemType {
JS_SORTING_VALUES,
JS_SORTING_GENERIC
};
/*
* 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.
*
* isValue should true iff vec points to an array of js::Value
*
* 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 bool
js_MergeSort(void *vec, size_t nel, size_t elsize, JSComparator cmp,
void *arg, void *tmp, JSMergeSortElemType elemType);
/*
* The Array.prototype.sort fast-native entry point is exported for joined
* function optimization in js{interp,tracer}.cpp.
*/
namespace js {
extern JSBool
array_sort(JSContext *cx, uintN argc, js::Value *vp);
}
#ifdef DEBUG
extern JSBool
js_ArrayInfo(JSContext *cx, uintN argc, jsval *vp);
#endif
extern JSBool
js_ArrayCompPush(JSContext *cx, JSObject *obj, const js::Value &vp);
/*
* 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, jsid id,
js::Value *vp);
/* Array constructor native. Exposed only so the JIT can know its address. */
JSBool
js_Array(JSContext *cx, uintN argc, js::Value *vp);
/*
* Makes a fast clone of a dense array as long as the array only contains
* primitive values.
*
* If the return value is JS_FALSE then clone will not be set.
*
* If the return value is JS_TRUE then clone will either be set to the address
* of a new JSObject or to NULL if the array was not dense or contained values
* that were not primitives.
*/
JS_FRIEND_API(JSBool)
js_CloneDensePrimitiveArray(JSContext *cx, JSObject *obj, JSObject **clone);
/*
* Returns JS_TRUE if the given object is a dense array that contains only
* primitive values.
*/
JS_FRIEND_API(JSBool)
js_IsDensePrimitiveArray(JSObject *obj);
extern JSBool JS_FASTCALL
js_EnsureDenseArrayCapacity(JSContext *cx, JSObject *obj, jsint i);
#endif /* jsarray_h___ */
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