bool
SetDenseElement(JSContext *cx, HandleObject obj, int32_t index, HandleValue value,
bool strict)
{
// This function is called from Ion code for StoreElementHole's OOL path.
// In this case we know the object is native, has no indexed properties
// and we can use setDenseElement instead of setDenseElementWithType.
MOZ_ASSERT(obj->isNative());
MOZ_ASSERT(!obj->isIndexed());
JSObject::EnsureDenseResult result = JSObject::ED_SPARSE;
do {
if (index < 0)
break;
bool isArray = obj->is<ArrayObject>();
if (isArray && !obj->as<ArrayObject>().lengthIsWritable())
break;
uint32_t idx = uint32_t(index);
result = obj->ensureDenseElements(cx, idx, 1);
if (result != JSObject::ED_OK)
break;
if (isArray) {
ArrayObject &arr = obj->as<ArrayObject>();
if (idx >= arr.length())
arr.setLengthInt32(idx + 1);
}
obj->setDenseElement(idx, value);
return true;
} while (false);
if (result == JSObject::ED_FAILED)
return false;
MOZ_ASSERT(result == JSObject::ED_SPARSE);
RootedValue indexVal(cx, Int32Value(index));
return SetObjectElement(cx, obj, indexVal, value, strict);
}
/* ES5 15.12.3 JA. */
static bool
JA(JSContext* cx, HandleObject obj, StringifyContext* scx)
{
/*
* This method implements the JA algorithm in ES5 15.12.3, but:
*
* * The algorithm is somewhat reformulated to allow the final string to
* be streamed into a single buffer, rather than be created and copied
* into place incrementally as the ES5 algorithm specifies it. This
* requires moving portions of the Str call in 8a into this algorithm
* (and in JO as well).
*/
/* Steps 1-2, 11. */
CycleDetector detect(scx, obj);
if (!detect.foundCycle(cx))
return false;
if (!scx->sb.append('['))
return false;
/* Step 6. */
uint32_t length;
if (!GetLengthProperty(cx, obj, &length))
return false;
/* Steps 7-10. */
if (length != 0) {
/* Steps 4, 10b(i). */
if (!WriteIndent(cx, scx, scx->depth))
return false;
/* Steps 7-10. */
RootedValue outputValue(cx);
for (uint32_t i = 0; i < length; i++) {
if (!CheckForInterrupt(cx))
return false;
/*
* Steps 8a-8c. Again note how the call to the spec's Str method
* is broken up into getting the property, running it past toJSON
* and the replacer and maybe unboxing, and interpreting some
* values as |null| in separate steps.
*/
#ifdef DEBUG
if (scx->maybeSafely) {
/*
* Trying to do a JS_AlreadyHasOwnElement runs the risk of
* hitting OOM on jsid creation. Let's just assert sanity for
* small enough indices.
*/
MOZ_ASSERT(obj->is<ArrayObject>());
MOZ_ASSERT(obj->is<NativeObject>());
RootedNativeObject nativeObj(cx, &obj->as<NativeObject>());
if (i <= JSID_INT_MAX) {
MOZ_ASSERT(nativeObj->containsDenseElement(i) != nativeObj->isIndexed(),
"the array must either be small enough to remain "
"fully dense (and otherwise un-indexed), *or* "
"all its initially-dense elements were sparsified "
"and the object is indexed");
} else {
MOZ_ASSERT(obj->isIndexed());
}
}
#endif
if (!GetElement(cx, obj, obj, i, &outputValue))
return false;
if (!PreprocessValue(cx, obj, i, &outputValue, scx))
return false;
if (IsFilteredValue(outputValue)) {
if (!scx->sb.append("null"))
return false;
} else {
if (!Str(cx, outputValue, scx))
return false;
}
/* Steps 3, 4, 10b(i). */
if (i < length - 1) {
if (!scx->sb.append(','))
return false;
if (!WriteIndent(cx, scx, scx->depth))
return false;
}
}
/* Step 10(b)(iii). */
if (!WriteIndent(cx, scx, scx->depth - 1))
return false;
}
return scx->sb.append(']');
}
