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Bug 918808 part 4 - Refactor Array.prototype.join to use the fast path in more cases. r=luke

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This commit is contained in:
Jan de Mooij 2013-09-24 17:00:22 +02:00
parent 8bbc511111
commit 2a084d8ebd
1 changed files with 125 additions and 71 deletions
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196
js/src/jsarray.cpp
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@ -894,8 +894,107 @@ array_toSource(JSContext *cx, unsigned argc, Value *vp)
}
#endif
struct EmptySeparatorOp
{
bool operator()(JSContext *, StringBuffer &sb) { return true; }
};
struct CharSeparatorOp
{
jschar sep;
CharSeparatorOp(jschar sep) : sep(sep) {};
bool operator()(JSContext *, StringBuffer &sb) { return sb.append(sep); }
};
struct StringSeparatorOp
{
const jschar *sepchars;
size_t seplen;
StringSeparatorOp(const jschar *sepchars, size_t seplen)
: sepchars(sepchars), seplen(seplen) {};
bool operator()(JSContext *cx, StringBuffer &sb) {
return sb.append(sepchars, seplen);
}
};
template <bool Locale, typename SeparatorOp>
static bool
array_join_sub(JSContext *cx, CallArgs &args, bool locale)
ArrayJoinKernel(JSContext *cx, SeparatorOp sepOp, HandleObject obj, uint32_t length,
StringBuffer &sb)
{
uint32_t i = 0;
if (!Locale && obj->is<ArrayObject>() && !ObjectMayHaveExtraIndexedProperties(obj)) {
// This loop handles all elements up to initializedLength. If
// length > initLength we rely on the second loop to add the
// other elements.
uint32_t initLength = obj->getDenseInitializedLength();
while (i < initLength) {
if (!JS_CHECK_OPERATION_LIMIT(cx))
return false;
const Value &elem = obj->getDenseElement(i);
if (elem.isString()) {
if (!sb.append(elem.toString()))
return false;
} else if (elem.isNumber()) {
if (!NumberValueToStringBuffer(cx, elem, sb))
return false;
} else if (elem.isBoolean()) {
if (!BooleanToStringBuffer(cx, elem.toBoolean(), sb))
return false;
} else if (elem.isObject()) {
/*
* Object stringifying could modify the initialized length or make
* the array sparse. Delegate it to a separate loop to keep this
* one tight.
*/
break;
} else {
JS_ASSERT(elem.isMagic(JS_ELEMENTS_HOLE) || elem.isNullOrUndefined());
}
if (++i != length && !sepOp(cx, sb))
return false;
}
}
if (i != length) {
RootedValue v(cx);
while (i < length) {
if (!JS_CHECK_OPERATION_LIMIT(cx))
return false;
bool hole;
if (!GetElement(cx, obj, i, &hole, &v))
return false;
if (!hole && !v.isNullOrUndefined()) {
if (Locale) {
JSObject *robj = ToObject(cx, v);
if (!robj)
return false;
RootedId id(cx, NameToId(cx->names().toLocaleString));
if (!robj->callMethod(cx, id, 0, NULL, &v))
return false;
}
if (!ValueToStringBuffer(cx, v, sb))
return false;
}
if (++i != length && !sepOp(cx, sb))
return false;
}
}
return true;
}
template <bool Locale>
static bool
ArrayJoin(JSContext *cx, CallArgs &args)
{
// This method is shared by Array.prototype.join and
// Array.prototype.toLocaleString. The steps in ES5 are nearly the same, so
@ -922,19 +1021,21 @@ array_join_sub(JSContext *cx, CallArgs &args, bool locale)
// Steps 4 and 5
RootedString sepstr(cx, NULL);
if (!locale && args.hasDefined(0)) {
if (!Locale && args.hasDefined(0)) {
sepstr = ToString<CanGC>(cx, args[0]);
if (!sepstr)
return false;
}
static const jschar comma = ',';
const jschar *sep;
const jschar *sepchars;
size_t seplen;
if (sepstr) {
sep = NULL;
sepchars = sepstr->getChars(cx);
if (!sepchars)
return false;
seplen = sepstr->length();
} else {
sep = &comma;
static const jschar comma = ',';
sepchars = &comma;
seplen = 1;
}
@ -942,70 +1043,24 @@ array_join_sub(JSContext *cx, CallArgs &args, bool locale)
StringBuffer sb(cx);
// The separator will be added |length - 1| times, reserve space for that
// so that we don't have to unnecessarily grow the buffer.
if (length > 0 && !sb.reserve(seplen * (length - 1)))
return false;
// Various optimized versions of steps 7-10
if (!locale && !seplen && obj->is<ArrayObject>() && !ObjectMayHaveExtraIndexedProperties(obj)) {
uint32_t i;
for (i = 0; i < obj->getDenseInitializedLength(); ++i) {
if (!JS_CHECK_OPERATION_LIMIT(cx))
return false;
const Value *elem = &obj->getDenseElement(i);
/*
* Object stringifying is slow; delegate it to a separate loop to
* keep this one tight.
*/
if (elem->isObject())
break;
if (!elem->isMagic(JS_ELEMENTS_HOLE) && !elem->isNullOrUndefined()) {
if (!ValueToStringBuffer(cx, *elem, sb))
return false;
}
}
RootedValue v(cx);
for (; i < length; ++i) {
if (!JS_CHECK_OPERATION_LIMIT(cx))
return false;
bool hole;
if (!GetElement(cx, obj, i, &hole, &v))
return false;
if (!hole && !v.isNullOrUndefined()) {
if (!ValueToStringBuffer(cx, v, sb))
return false;
}
}
if (seplen == 0) {
EmptySeparatorOp op;
if (!ArrayJoinKernel<Locale>(cx, op, obj, length, sb))
return false;
} else if (seplen == 1) {
CharSeparatorOp op(sepchars[0]);
if (!ArrayJoinKernel<Locale>(cx, op, obj, length, sb))
return false;
} else {
RootedValue elt(cx);
for (uint32_t index = 0; index < length; index++) {
if (!JS_CHECK_OPERATION_LIMIT(cx))
return false;
bool hole;
if (!GetElement(cx, obj, index, &hole, &elt))
return false;
if (!hole && !elt.isNullOrUndefined()) {
if (locale) {
JSObject *robj = ToObject(cx, elt);
if (!robj)
return false;
RootedId id(cx, NameToId(cx->names().toLocaleString));
if (!robj->callMethod(cx, id, 0, NULL, &elt))
return false;
}
if (!ValueToStringBuffer(cx, elt, sb))
return false;
}
if (index + 1 != length) {
const jschar *sepchars = sep ? sep : sepstr->getChars(cx);
if (!sepchars || !sb.append(sepchars, seplen))
return false;
}
}
StringSeparatorOp op(sepchars, seplen);
if (!ArrayJoinKernel<Locale>(cx, op, obj, length, sb))
return false;
}
// Step 11
@ -1060,8 +1115,7 @@ array_toLocaleString(JSContext *cx, unsigned argc, Value *vp)
JS_CHECK_RECURSION(cx, return false);
CallArgs args = CallArgsFromVp(argc, vp);
return array_join_sub(cx, args, true);
return ArrayJoin<true>(cx, args);
}
/* ES5 15.4.4.5 */
@ -1071,7 +1125,7 @@ array_join(JSContext *cx, unsigned argc, Value *vp)
JS_CHECK_RECURSION(cx, return false);
CallArgs args = CallArgsFromVp(argc, vp);
return array_join_sub(cx, args, false);
return ArrayJoin<false>(cx, args);
}
static inline bool