Esempio n. 1
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/* |callee| requires a usage string provided by JS_DefineFunctionsWithHelp. */
void
js::ReportUsageError(JSContext* cx, HandleObject callee, const char* msg)
{
    const char* usageStr = "usage";
    PropertyName* usageAtom = Atomize(cx, usageStr, strlen(usageStr))->asPropertyName();
    RootedId id(cx, NameToId(usageAtom));
    DebugOnly<Shape*> shape = static_cast<Shape*>(callee->as<JSFunction>().lookup(cx, id));
    MOZ_ASSERT(!shape->configurable());
    MOZ_ASSERT(!shape->writable());
    MOZ_ASSERT(shape->hasDefaultGetter());

    RootedValue usage(cx);
    if (!JS_GetProperty(cx, callee, "usage", &usage))
        return;

    if (!usage.isString()) {
        JS_ReportError(cx, "%s", msg);
    } else {
        JSString* str = usage.toString();
        if (!str->ensureFlat(cx))
            return;
        AutoStableStringChars chars(cx);
        if (!chars.initTwoByte(cx, str))
            return;

        JS_ReportError(cx, "%s. Usage: %hs", msg, chars.twoByteRange().start().get());
    }
}
Esempio n. 2
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JSAtom *
SavedFrame::getSource()
{
    const Value &v = getReservedSlot(JSSLOT_SOURCE);
    JSString *s = v.toString();
    return &s->asAtom();
}
Esempio n. 3
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bool
JSCompartment::wrap(JSContext* cx, MutableHandleString strp)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(this));
    MOZ_ASSERT(cx->compartment() == this);

    /* If the string is already in this compartment, we are done. */
    JSString* str = strp;
    if (str->zoneFromAnyThread() == zone())
        return true;

    /* If the string is an atom, we don't have to copy. */
    if (str->isAtom()) {
        MOZ_ASSERT(str->isPermanentAtom() || str->zone()->isAtomsZone());
        return true;
    }

    /* Check the cache. */
    RootedValue key(cx, StringValue(str));
    if (WrapperMap::Ptr p = crossCompartmentWrappers.lookup(CrossCompartmentKey(key))) {
        strp.set(p->value().get().toString());
        return true;
    }

    /* No dice. Make a copy, and cache it. */
    JSString* copy = CopyStringPure(cx, str);
    if (!copy)
        return false;
    if (!putWrapper(cx, CrossCompartmentKey(key), StringValue(copy)))
        return false;

    strp.set(copy);
    return true;
}
Esempio n. 4
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// Overview: These functions convert a JSString from holding a string in rope form
// down to a simple String representation. It does so by building up the string
// backwards, since we want to avoid recursion, we expect that the tree structure
// representing the rope is likely imbalanced with more nodes down the left side
// (since appending to the string is likely more common) - and as such resolving
// in this fashion should minimize work queue size.  (If we built the queue forwards
// we would likely have to place all of the constituent StringImpls into the
// Vector before performing any concatenation, but by working backwards we likely
// only fill the queue with the number of substrings at any given level in a
// rope-of-ropes.)    
void JSRopeString::resolveRopeSlowCase8(LChar* buffer) const
{
    LChar* position = buffer + m_length; // We will be working backwards over the rope.
    Vector<JSString*, 32, UnsafeVectorOverflow> workQueue; // Putting strings into a Vector is only OK because there are no GC points in this method.
    
    for (size_t i = 0; i < s_maxInternalRopeLength && m_fibers[i]; ++i)
        workQueue.append(m_fibers[i].get());

    while (!workQueue.isEmpty()) {
        JSString* currentFiber = workQueue.last();
        workQueue.removeLast();

        if (currentFiber->isRope()) {
            JSRopeString* currentFiberAsRope = static_cast<JSRopeString*>(currentFiber);
            for (size_t i = 0; i < s_maxInternalRopeLength && currentFiberAsRope->m_fibers[i]; ++i)
                workQueue.append(currentFiberAsRope->m_fibers[i].get());
            continue;
        }

        StringImpl* string = static_cast<StringImpl*>(currentFiber->m_value.impl());
        unsigned length = string->length();
        position -= length;
        StringImpl::copyChars(position, string->characters8(), length);
    }

    ASSERT(buffer == position);
}
Esempio n. 5
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void JSRopeString::resolveRopeSlowCase(UChar* buffer) const
{
    UChar* position = buffer + m_length; // We will be working backwards over the rope.
    Vector<JSString*, 32, UnsafeVectorOverflow> workQueue; // These strings are kept alive by the parent rope, so using a Vector is OK.

    for (size_t i = 0; i < s_maxInternalRopeLength && m_fibers[i]; ++i)
        workQueue.append(m_fibers[i].get());

    while (!workQueue.isEmpty()) {
        JSString* currentFiber = workQueue.last();
        workQueue.removeLast();

        if (currentFiber->isRope()) {
            JSRopeString* currentFiberAsRope = static_cast<JSRopeString*>(currentFiber);
            for (size_t i = 0; i < s_maxInternalRopeLength && currentFiberAsRope->m_fibers[i]; ++i)
                workQueue.append(currentFiberAsRope->m_fibers[i].get());
            continue;
        }

        StringImpl* string = static_cast<StringImpl*>(currentFiber->m_value.impl());
        unsigned length = string->length();
        position -= length;
        if (string->is8Bit())
            StringImpl::copyChars(position, string->characters8(), length);
        else
            StringImpl::copyChars(position, string->characters16(), length);
    }

    ASSERT(buffer == position);
}
Esempio n. 6
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static JSObject *
CloneObject(JSContext *cx, HandleObject selfHostedObject)
{
    AutoCycleDetector detect(cx, selfHostedObject);
    if (!detect.init())
        return nullptr;
    if (detect.foundCycle()) {
        JS_ReportError(cx, "SelfHosted cloning cannot handle cyclic object graphs.");
        return nullptr;
    }

    RootedObject clone(cx);
    if (selfHostedObject->is<JSFunction>()) {
        RootedFunction selfHostedFunction(cx, &selfHostedObject->as<JSFunction>());
        bool hasName = selfHostedFunction->atom() != nullptr;
        // Arrow functions use the first extended slot for their lexical |this| value.
        JS_ASSERT(!selfHostedFunction->isArrow());
        js::gc::AllocKind kind = hasName
                                 ? JSFunction::ExtendedFinalizeKind
                                 : selfHostedFunction->getAllocKind();
        clone = CloneFunctionObject(cx, selfHostedFunction, cx->global(), kind, TenuredObject);
        // To be able to re-lazify the cloned function, its name in the
        // self-hosting compartment has to be stored on the clone.
        if (clone && hasName)
            clone->as<JSFunction>().setExtendedSlot(0, StringValue(selfHostedFunction->atom()));
    } else if (selfHostedObject->is<RegExpObject>()) {
        RegExpObject &reobj = selfHostedObject->as<RegExpObject>();
        RootedAtom source(cx, reobj.getSource());
        JS_ASSERT(source->isPermanentAtom());
        clone = RegExpObject::createNoStatics(cx, source, reobj.getFlags(), nullptr);
    } else if (selfHostedObject->is<DateObject>()) {
        clone = JS_NewDateObjectMsec(cx, selfHostedObject->as<DateObject>().UTCTime().toNumber());
    } else if (selfHostedObject->is<BooleanObject>()) {
        clone = BooleanObject::create(cx, selfHostedObject->as<BooleanObject>().unbox());
    } else if (selfHostedObject->is<NumberObject>()) {
        clone = NumberObject::create(cx, selfHostedObject->as<NumberObject>().unbox());
    } else if (selfHostedObject->is<StringObject>()) {
        JSString *selfHostedString = selfHostedObject->as<StringObject>().unbox();
        if (!selfHostedString->isFlat())
            MOZ_CRASH();
        RootedString str(cx, js_NewStringCopyN<CanGC>(cx,
                                                      selfHostedString->asFlat().chars(),
                                                      selfHostedString->asFlat().length()));
        if (!str)
            return nullptr;
        clone = StringObject::create(cx, str);
    } else if (selfHostedObject->is<ArrayObject>()) {
        clone = NewDenseEmptyArray(cx, nullptr, TenuredObject);
    } else {
        JS_ASSERT(selfHostedObject->isNative());
        clone = NewObjectWithGivenProto(cx, selfHostedObject->getClass(), nullptr, cx->global(),
                                        selfHostedObject->tenuredGetAllocKind(),
                                        SingletonObject);
    }
    if (!clone)
        return nullptr;
    if (!CloneProperties(cx, selfHostedObject, clone))
        return nullptr;
    return clone;
}
void
Shape::dump(JSContext *cx, FILE *fp) const
{
    jsid propid = this->propid();

    JS_ASSERT(!JSID_IS_VOID(propid));

    if (JSID_IS_INT(propid)) {
        fprintf(fp, "[%ld]", (long) JSID_TO_INT(propid));
    } else if (JSID_IS_DEFAULT_XML_NAMESPACE(propid)) {
        fprintf(fp, "<default XML namespace>");
    } else {
        JSLinearString *str;
        if (JSID_IS_ATOM(propid)) {
            str = JSID_TO_ATOM(propid);
        } else {
            JS_ASSERT(JSID_IS_OBJECT(propid));
            JSString *s = ToStringSlow<CanGC>(cx, IdToValue(propid));
            fputs("object ", fp);
            str = s ? s->ensureLinear(cx) : NULL;
        }
        if (!str)
            fputs("<error>", fp);
        else
            FileEscapedString(fp, str, '"');
    }

    fprintf(fp, " g/s %p/%p slot %d attrs %x ",
            JS_FUNC_TO_DATA_PTR(void *, base()->rawGetter),
            JS_FUNC_TO_DATA_PTR(void *, base()->rawSetter),
            hasSlot() ? slot() : -1, attrs);

    if (attrs) {
        int first = 1;
        fputs("(", fp);
#define DUMP_ATTR(name, display) if (attrs & JSPROP_##name) fputs(&(" " #display)[first], fp), first = 0
        DUMP_ATTR(ENUMERATE, enumerate);
        DUMP_ATTR(READONLY, readonly);
        DUMP_ATTR(PERMANENT, permanent);
        DUMP_ATTR(GETTER, getter);
        DUMP_ATTR(SETTER, setter);
        DUMP_ATTR(SHARED, shared);
#undef  DUMP_ATTR
        fputs(") ", fp);
    }

    fprintf(fp, "flags %x ", flags);
    if (flags) {
        int first = 1;
        fputs("(", fp);
#define DUMP_FLAG(name, display) if (flags & name) fputs(&(" " #display)[first], fp), first = 0
        DUMP_FLAG(HAS_SHORTID, has_shortid);
        DUMP_FLAG(IN_DICTIONARY, in_dictionary);
#undef  DUMP_FLAG
        fputs(") ", fp);
    }

    fprintf(fp, "shortid %d\n", maybeShortid());
}
Esempio n. 8
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JSAtom *
js_AtomizeChars(JSContext *cx, const jschar *chars, size_t length, uintN flags)
{
    JSString str;

    str.initFlat((jschar *)chars, length);
    return js_AtomizeString(cx, &str, ATOM_TMPSTR | flags);
}
Esempio n. 9
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void
Shape::dump(JSContext *cx, FILE *fp) const
{
    /* This is only used from gdb, so allowing GC here would just be confusing. */
    gc::AutoSuppressGC suppress(cx);

    jsid propid = this->propid();

    JS_ASSERT(!JSID_IS_VOID(propid));

    if (JSID_IS_INT(propid)) {
        fprintf(fp, "[%ld]", (long) JSID_TO_INT(propid));
    } else {
        JSLinearString *str;
        if (JSID_IS_ATOM(propid)) {
            str = JSID_TO_ATOM(propid);
        } else {
            JS_ASSERT(JSID_IS_OBJECT(propid));
            Value v = IdToValue(propid);
            JSString *s = ToStringSlow<NoGC>(cx, v);
            fputs("object ", fp);
            str = s ? s->ensureLinear(cx) : nullptr;
        }
        if (!str)
            fputs("<error>", fp);
        else
            FileEscapedString(fp, str, '"');
    }

    fprintf(fp, " g/s %p/%p slot %d attrs %x ",
            JS_FUNC_TO_DATA_PTR(void *, base()->rawGetter),
            JS_FUNC_TO_DATA_PTR(void *, base()->rawSetter),
            hasSlot() ? slot() : -1, attrs);

    if (attrs) {
        int first = 1;
        fputs("(", fp);
#define DUMP_ATTR(name, display) if (attrs & JSPROP_##name) fputs(&(" " #display)[first], fp), first = 0
        DUMP_ATTR(ENUMERATE, enumerate);
        DUMP_ATTR(READONLY, readonly);
        DUMP_ATTR(PERMANENT, permanent);
        DUMP_ATTR(GETTER, getter);
        DUMP_ATTR(SETTER, setter);
        DUMP_ATTR(SHARED, shared);
#undef  DUMP_ATTR
        fputs(") ", fp);
    }

    fprintf(fp, "flags %x ", flags);
    if (flags) {
        int first = 1;
        fputs("(", fp);
#define DUMP_FLAG(name, display) if (flags & name) fputs(&(" " #display)[first], fp), first = 0
        DUMP_FLAG(IN_DICTIONARY, in_dictionary);
#undef  DUMP_FLAG
        fputs(") ", fp);
    }
}
Esempio n. 10
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static JSObject *
CloneObject(JSContext *cx, JSObject *selfHostedObject, CloneMemory &clonedObjects)
{
    DependentAddPtr<CloneMemory> p(cx, clonedObjects, selfHostedObject);
    if (p)
        return p->value();
    RootedObject clone(cx);
    if (selfHostedObject->is<JSFunction>()) {
        JSFunction *selfHostedFunction = &selfHostedObject->as<JSFunction>();
        bool hasName = selfHostedFunction->atom() != nullptr;
        js::gc::AllocKind kind = hasName
                                 ? JSFunction::ExtendedFinalizeKind
                                 : selfHostedFunction->getAllocKind();
        clone = CloneFunctionObject(cx, HandleFunction::fromMarkedLocation(&selfHostedFunction),
                                    cx->global(), kind, TenuredObject);
        // To be able to re-lazify the cloned function, its name in the
        // self-hosting compartment has to be stored on the clone.
        if (clone && hasName)
            clone->as<JSFunction>().setExtendedSlot(0, StringValue(selfHostedFunction->atom()));
    } else if (selfHostedObject->is<RegExpObject>()) {
        RegExpObject &reobj = selfHostedObject->as<RegExpObject>();
        RootedAtom source(cx, reobj.getSource());
        JS_ASSERT(source->isPermanentAtom());
        clone = RegExpObject::createNoStatics(cx, source, reobj.getFlags(), nullptr);
    } else if (selfHostedObject->is<DateObject>()) {
        clone = JS_NewDateObjectMsec(cx, selfHostedObject->as<DateObject>().UTCTime().toNumber());
    } else if (selfHostedObject->is<BooleanObject>()) {
        clone = BooleanObject::create(cx, selfHostedObject->as<BooleanObject>().unbox());
    } else if (selfHostedObject->is<NumberObject>()) {
        clone = NumberObject::create(cx, selfHostedObject->as<NumberObject>().unbox());
    } else if (selfHostedObject->is<StringObject>()) {
        JSString *selfHostedString = selfHostedObject->as<StringObject>().unbox();
        if (!selfHostedString->isFlat())
            MOZ_CRASH();
        RootedString str(cx, js_NewStringCopyN<CanGC>(cx,
                                                      selfHostedString->asFlat().chars(),
                                                      selfHostedString->asFlat().length()));
        if (!str)
            return nullptr;
        clone = StringObject::create(cx, str);
    } else if (selfHostedObject->is<ArrayObject>()) {
        clone = NewDenseEmptyArray(cx, nullptr, TenuredObject);
    } else {
        JS_ASSERT(selfHostedObject->isNative());
        clone = NewObjectWithGivenProto(cx, selfHostedObject->getClass(), nullptr, cx->global(),
                                        selfHostedObject->tenuredGetAllocKind(),
                                        SingletonObject);
    }
    if (!clone)
        return nullptr;
    if (!p.add(cx, clonedObjects, selfHostedObject, clone))
        return nullptr;
    if (!CloneProperties(cx, selfHostedObject, clone, clonedObjects)) {
        clonedObjects.remove(selfHostedObject);
        return nullptr;
    }
    return clone;
}
Esempio n. 11
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JSAtom *
SavedFrame::getFunctionDisplayName()
{
    const Value &v = getReservedSlot(JSSLOT_FUNCTIONDISPLAYNAME);
    if (v.isNull())
        return nullptr;
    JSString *s = v.toString();
    return &s->asAtom();
}
Esempio n. 12
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bool JSString::getOwnPropertySlotByIndex(JSCell* cell, ExecState* exec, unsigned propertyName, PropertySlot& slot)
{
    JSString* thisObject = jsCast<JSString*>(cell);
    // The semantics here are really getPropertySlot, not getOwnPropertySlot.
    // This function should only be called by JSValue::get.
    if (thisObject->getStringPropertySlot(exec, propertyName, slot))
        return true;
    return JSString::getOwnPropertySlot(thisObject, exec, Identifier::from(exec, propertyName), slot);
}
Esempio n. 13
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void JSString::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
    JSString* thisObject = asString(cell);
    Base::visitChildren(thisObject, visitor);
    
    if (thisObject->isRope())
        static_cast<JSRopeString*>(thisObject)->visitFibers(visitor);
    if (StringImpl* impl = thisObject->m_value.impl())
        visitor.reportExtraMemoryVisited(impl->costDuringGC());
}
Esempio n. 14
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JSAtom *
js::ToAtom(ExclusiveContext *cx, typename MaybeRooted<Value, allowGC>::HandleType v)
{
    if (!v.isString())
        return ToAtomSlow<allowGC>(cx, v);

    JSString *str = v.toString();
    if (str->isAtom())
        return &str->asAtom();

    return AtomizeString(cx, str);
}
Esempio n. 15
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static TriState equalToStringImpl(JSValue value, StringImpl* stringImpl)
{
    if (!value.isString())
        return FalseTriState;
    
    JSString* jsString = asString(value);
    const StringImpl* string = jsString->tryGetValueImpl();
    if (!string)
        return MixedTriState;
    
    return triState(WTF::equal(stringImpl, string));
}
Esempio n. 16
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JSBool
EvalScriptVersion16(JSContext *cx, uintN argc, jsval *vp)
{
    JS_ASSERT(argc == 1);
    jsval *argv = JS_ARGV(cx, vp);
    JS_ASSERT(JSVAL_IS_STRING(argv[0]));
    JSString *str = JSVAL_TO_STRING(argv[0]);
    const jschar *chars = str->getChars(cx);
    JS_ASSERT(chars);
    size_t len = str->length();
    return callbackData->evalVersion(chars, len, JSVERSION_1_6);
}
Esempio n. 17
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EncodedJSValue JSC_HOST_CALL symbolConstructorFor(ExecState* exec)
{
    VM& vm = exec->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    JSString* stringKey = exec->argument(0).toString(exec);
    RETURN_IF_EXCEPTION(scope, encodedJSValue());
    String string = stringKey->value(exec);
    RETURN_IF_EXCEPTION(scope, encodedJSValue());

    return JSValue::encode(Symbol::create(exec->vm(), exec->vm().symbolRegistry().symbolForKey(string)));
}
Esempio n. 18
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void JSString::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
    JSString* thisObject = jsCast<JSString*>(cell);
    Base::visitChildren(thisObject, visitor);
    
    if (thisObject->isRope())
        static_cast<JSRopeString*>(thisObject)->visitFibers(visitor);
    else {
        StringImpl* impl = thisObject->m_value.impl();
        ASSERT(impl);
        visitor.reportExtraMemoryUsage(thisObject, impl->costDuringGC());
    }
}
Esempio n. 19
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JSAtom *
js_AtomizeChars(JSContext *cx, const jschar *chars, size_t length, uintN flags)
{
    JSString str;

    CHECK_REQUEST(cx);

    if (!CheckStringLength(cx, length))
        return NULL;

    str.initFlatNotTerminated((jschar *)chars, length);
    return js_AtomizeString(cx, &str, ATOM_TMPSTR | flags);
}
Esempio n. 20
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bool
SecurityWrapper<Base>::defineProperty(JSContext *cx, HandleObject wrapper,
                                      HandleId id, PropertyDescriptor *desc)
{
    if (desc->getter || desc->setter) {
        JSString *str = IdToString(cx, id);
        const jschar *prop = str ? str->getCharsZ(cx) : NULL;
        JS_ReportErrorNumberUC(cx, js_GetErrorMessage, NULL,
                               JSMSG_ACCESSOR_DEF_DENIED, prop);
        return false;
    }

    return Base::defineProperty(cx, wrapper, id, desc);
}
Esempio n. 21
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bool
JSCompartment::wrap(JSContext *cx, JSString **strp)
{
    JS_ASSERT(!cx->runtime()->isAtomsCompartment(this));
    JS_ASSERT(cx->compartment() == this);

    /* If the string is already in this compartment, we are done. */
    JSString *str = *strp;
    if (str->zone() == zone())
        return true;

    /* If the string is an atom, we don't have to copy. */
    if (str->isAtom()) {
        JS_ASSERT(cx->runtime()->isAtomsZone(str->zone()));
        return true;
    }

    /* Check the cache. */
    RootedValue key(cx, StringValue(str));
    if (WrapperMap::Ptr p = crossCompartmentWrappers.lookup(key)) {
        *strp = p->value().get().toString();
        return true;
    }

    /* No dice. Make a copy, and cache it. */
    Rooted<JSLinearString *> linear(cx, str->ensureLinear(cx));
    if (!linear)
        return false;
    JSString *copy = js_NewStringCopyN<CanGC>(cx, linear->chars(),
                                              linear->length());
    if (!copy)
        return false;
    if (!putWrapper(key, StringValue(copy)))
        return false;

    if (linear->zone()->isGCMarking()) {
        /*
         * All string wrappers are dropped when collection starts, but we
         * just created a new one.  Mark the wrapped string to stop it being
         * finalized, because if it was then the pointer in this
         * compartment's wrapper map would be left dangling.
         */
        JSString *tmp = linear;
        MarkStringUnbarriered(&cx->runtime()->gcMarker, &tmp, "wrapped string");
        JS_ASSERT(tmp == linear);
    }

    *strp = copy;
    return true;
}
Esempio n. 22
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bool JSPropertyNameIterator::next(ExecState* exec, JSValue& output)
{
    if (m_enumerationPhase == EnumerationPhase::IndexedNames) {
        for (; m_cursor < m_propertyNameEnumerator->indexedLength();) {
            uint32_t index = m_cursor++;
            if (m_iteratedObject->hasProperty(exec, index)) {
                output = jsString(exec, Identifier::from(exec, index).string());
                return true;
            }
        }
        m_cursor = 0;
        m_enumerationPhase = EnumerationPhase::StructureNames;
    }

    if (m_enumerationPhase == EnumerationPhase::StructureNames) {
        for (; m_cursor < m_propertyNameEnumerator->endStructurePropertyIndex();) {
            uint32_t index = m_cursor++;
            JSString* propertyName = m_propertyNameEnumerator->propertyNameAtIndex(index);
            ASSERT(propertyName);
            if (m_iteratedObject->structure(exec->vm())->id() == m_propertyNameEnumerator->cachedStructureID()) {
                output = propertyName;
                return true;
            }

            if (m_iteratedObject->hasProperty(exec, propertyName->toIdentifier(exec))) {
                output = propertyName;
                return true;
            }
        }
        ASSERT(m_cursor >= m_propertyNameEnumerator->endStructurePropertyIndex());
        // Use the same m_cursor in the GenericNames phase.
        m_enumerationPhase = EnumerationPhase::GenericNames;
    }

    if (m_enumerationPhase == EnumerationPhase::GenericNames) {
        for (; m_cursor < m_propertyNameEnumerator->endGenericPropertyIndex();) {
            uint32_t index = m_cursor++;
            JSString* propertyName = m_propertyNameEnumerator->propertyNameAtIndex(index);
            ASSERT(propertyName);
            if (m_iteratedObject->hasProperty(exec, propertyName->toIdentifier(exec))) {
                output = propertyName;
                return true;
            }
        }
        m_enumerationPhase = EnumerationPhase::Done;
    }

    return false;
}
Esempio n. 23
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static TriState equalToSingleCharacter(JSValue value, UChar character)
{
    if (!value.isString())
        return FalseTriState;
    
    JSString* jsString = asString(value);
    if (jsString->length() != 1)
        return FalseTriState;
    
    const StringImpl* string = jsString->tryGetValueImpl();
    if (!string)
        return MixedTriState;
    
    return triState(string->at(0) == character);
}
Esempio n. 24
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EncodedJSValue JSC_HOST_CALL regExpProtoFuncSearch(ExecState* exec)
{
    JSValue thisValue = exec->thisValue();
    if (!thisValue.inherits(RegExpObject::info()))
        return throwVMTypeError(exec);
    RegExp* regExp = asRegExpObject(thisValue)->regExp();

    JSString* string = exec->argument(0).toString(exec);
    String s = string->value(exec);
    if (exec->hadException())
        return JSValue::encode(jsUndefined());

    RegExpConstructor* regExpConstructor = exec->lexicalGlobalObject()->regExpConstructor();
    MatchResult result = regExpConstructor->performMatch(exec->vm(), regExp, string, s, 0);
    return JSValue::encode(result ? jsNumber(result.start) : jsNumber(-1));
}
Esempio n. 25
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    void generateStringPath(Assembler &masm)
    {
        const ValueRemat &lvr = ic.lvr;
        const ValueRemat &rvr = ic.rvr;

        JS_ASSERT_IF(lvr.isConstant(), lvr.isType(JSVAL_TYPE_STRING));
        JS_ASSERT_IF(rvr.isConstant(), rvr.isType(JSVAL_TYPE_STRING));

        if (!lvr.isType(JSVAL_TYPE_STRING)) {
            Jump lhsFail = masm.testString(Assembler::NotEqual, lvr.typeReg());
            linkToStub(lhsFail);
        }
        
        if (!rvr.isType(JSVAL_TYPE_STRING)) {
            Jump rhsFail = masm.testString(Assembler::NotEqual, rvr.typeReg());
            linkToStub(rhsFail);
        }

        RegisterID tmp = ic.tempReg;
        
        /* JSString::isAtom === (lengthAndFlags & ATOM_MASK == 0) */
        JS_STATIC_ASSERT(JSString::ATOM_FLAGS == 0);
        Imm32 atomMask(JSString::ATOM_MASK);
        
        masm.load32(Address(lvr.dataReg(), JSString::offsetOfLengthAndFlags()), tmp);
        Jump lhsNotAtomized = masm.branchTest32(Assembler::NonZero, tmp, atomMask);
        linkToStub(lhsNotAtomized);

        if (!rvr.isConstant()) {
            masm.load32(Address(rvr.dataReg(), JSString::offsetOfLengthAndFlags()), tmp);
            Jump rhsNotAtomized = masm.branchTest32(Assembler::NonZero, tmp, atomMask);
            linkToStub(rhsNotAtomized);
        }

        if (rvr.isConstant()) {
            JSString *str = rvr.value().toString();
            JS_ASSERT(str->isAtom());
            Jump test = masm.branchPtr(ic.cond, lvr.dataReg(), ImmPtr(str));
            linkTrue(test);
        } else {
            Jump test = masm.branchPtr(ic.cond, lvr.dataReg(), rvr.dataReg());
            linkTrue(test);
        }

        Jump fallthrough = masm.jump();
        linkFalse(fallthrough);
    }
Esempio n. 26
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JSAtom*
js::ToAtom(ExclusiveContext* cx, typename MaybeRooted<Value, allowGC>::HandleType v)
{
    if (!v.isString())
        return ToAtomSlow<allowGC>(cx, v);

    JSString* str = v.toString();
    if (str->isAtom())
        return &str->asAtom();

    JSAtom* atom = AtomizeString(cx, str);
    if (!atom && !allowGC) {
        MOZ_ASSERT_IF(cx->isJSContext(), cx->asJSContext()->isThrowingOutOfMemory());
        cx->recoverFromOutOfMemory();
    }
    return atom;
}
Esempio n. 27
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bool
SecurityWrapper<Base>::defineProperty(JSContext *cx, HandleObject wrapper,
                                      HandleId id, MutableHandle<PropertyDescriptor> desc) const
{
    if (desc.getter() || desc.setter()) {
        JSString *str = IdToString(cx, id);
        AutoStableStringChars chars(cx);
        const jschar *prop = nullptr;
        if (str->ensureFlat(cx) && chars.initTwoByte(cx, str))
            prop = chars.twoByteChars();
        JS_ReportErrorNumberUC(cx, js_GetErrorMessage, nullptr,
                               JSMSG_ACCESSOR_DEF_DENIED, prop);
        return false;
    }

    return Base::defineProperty(cx, wrapper, id, desc);
}
Esempio n. 28
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bool JSString::getOwnPropertySlot(JSCell* cell, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
{
    JSString* thisObject = jsCast<JSString*>(cell);
    // The semantics here are really getPropertySlot, not getOwnPropertySlot.
    // This function should only be called by JSValue::get.
    if (thisObject->getStringPropertySlot(exec, propertyName, slot))
        return true;
    slot.setBase(thisObject);
    JSObject* object;
    for (JSValue prototype = exec->lexicalGlobalObject()->stringPrototype(); !prototype.isNull(); prototype = object->prototype()) {
        object = asObject(prototype);
        if (object->methodTable()->getOwnPropertySlot(object, exec, propertyName, slot))
            return true;
    }
    slot.setUndefined();
    return true;
}
Esempio n. 29
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inline RegExpFlags toFlags(ExecState* exec, JSValue flags)
{
    if (flags.isUndefined())
        return NoFlags;
    JSString* flagsString = flags.toString(exec);
    if (!flagsString) {
        ASSERT(exec->hadException());
        return InvalidFlags;
    }

    RegExpFlags result = regExpFlags(flagsString->value(exec));
    if (exec->hadException())
        return InvalidFlags;
    if (result == InvalidFlags)
        throwSyntaxError(exec, ASCIILiteral("Invalid flags supplied to RegExp constructor."));
    return result;
}
Esempio n. 30
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/**
 * Handles an assertion failure in self-hosted code just like an assertion
 * failure in C++ code. Information about the failure can be provided in args[0].
 */
static bool
intrinsic_AssertionFailed(JSContext *cx, unsigned argc, Value *vp)
{
#ifdef DEBUG
    CallArgs args = CallArgsFromVp(argc, vp);
    if (args.length() > 0) {
        // try to dump the informative string
        JSString *str = ToString<CanGC>(cx, args[0]);
        if (str) {
            fprintf(stderr, "Self-hosted JavaScript assertion info: ");
            str->dumpCharsNoNewline();
            fputc('\n', stderr);
        }
    }
#endif
    JS_ASSERT(false);
    return false;
}