1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 * vim: set ts=8 sw=4 et tw=79:
4 * ***** BEGIN LICENSE BLOCK *****
5 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
7 * The contents of this file are subject to the Mozilla Public License Version
8 * 1.1 (the "License"); you may not use this file except in compliance with
9 * the License. You may obtain a copy of the License at
10 * http://www.mozilla.org/MPL/
12 * Software distributed under the License is distributed on an "AS IS" basis,
13 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14 * for the specific language governing rights and limitations under the
17 * The Original Code is Mozilla Communicator client code, released
20 * The Initial Developer of the Original Code is
21 * Netscape Communications Corporation.
22 * Portions created by the Initial Developer are Copyright (C) 1998
23 * the Initial Developer. All Rights Reserved.
27 * Alternatively, the contents of this file may be used under the terms of
28 * either of the GNU General Public License Version 2 or later (the "GPL"),
29 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
30 * in which case the provisions of the GPL or the LGPL are applicable instead
31 * of those above. If you wish to allow use of your version of this file only
32 * under the terms of either the GPL or the LGPL, and not to allow others to
33 * use your version of this file under the terms of the MPL, indicate your
34 * decision by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL or the LGPL. If you do not delete
36 * the provisions above, a recipient may use your version of this file under
37 * the terms of any one of the MPL, the GPL or the LGPL.
39 * ***** END LICENSE BLOCK ***** */
42 * JS object implementation.
58 #include "jsbuiltins.h"
60 #include "jsversion.h"
74 #include "jsstaticcheck.h"
80 #include "jswrapper.h"
82 #include "jsinterpinlines.h"
83 #include "jsscopeinlines.h"
84 #include "jsscriptinlines.h"
85 #include "jsobjinlines.h"
91 #if JS_HAS_XML_SUPPORT
100 #include "jsatominlines.h"
101 #include "jsobjinlines.h"
102 #include "jsscriptinlines.h"
104 #include "jsautooplen.h"
107 using namespace js::gc;
109 JS_FRIEND_DATA(const JSObjectMap) JSObjectMap::sharedNonNative(JSObjectMap::SHAPELESS);
111 Class js_ObjectClass = {
113 JSCLASS_HAS_CACHED_PROTO(JSProto_Object),
114 PropertyStub, /* addProperty */
115 PropertyStub, /* delProperty */
116 PropertyStub, /* getProperty */
117 StrictPropertyStub, /* setProperty */
123 JS_FRIEND_API(JSObject *)
124 js_ObjectToOuterObject(JSContext *cx, JSObject *obj)
126 OBJ_TO_OUTER_OBJECT(cx, obj);
130 #if JS_HAS_OBJ_PROTO_PROP
133 obj_getProto(JSContext *cx, JSObject *obj, jsid id, Value *vp);
136 obj_setProto(JSContext *cx, JSObject *obj, jsid id, JSBool strict, Value *vp);
138 static JSPropertySpec object_props[] = {
139 {js_proto_str, 0, JSPROP_PERMANENT|JSPROP_SHARED, Jsvalify(obj_getProto), Jsvalify(obj_setProto)},
144 obj_getProto(JSContext *cx, JSObject *obj, jsid id, Value *vp)
146 /* Let CheckAccess get the slot's value, based on the access mode. */
148 id = ATOM_TO_JSID(cx->runtime->atomState.protoAtom);
149 return CheckAccess(cx, obj, id, JSACC_PROTO, vp, &attrs);
153 obj_setProto(JSContext *cx, JSObject *obj, jsid id, JSBool strict, Value *vp)
155 /* ECMAScript 5 8.6.2 forbids changing [[Prototype]] if not [[Extensible]]. */
156 if (!obj->isExtensible()) {
157 obj->reportNotExtensible(cx);
161 if (!vp->isObjectOrNull())
164 JSObject *pobj = vp->toObjectOrNull();
167 * Innerize pobj here to avoid sticking unwanted properties on the
168 * outer object. This ensures that any with statements only grant
169 * access to the inner object.
171 OBJ_TO_INNER_OBJECT(cx, pobj);
177 id = ATOM_TO_JSID(cx->runtime->atomState.protoAtom);
178 if (!CheckAccess(cx, obj, id, JSAccessMode(JSACC_PROTO|JSACC_WRITE), vp, &attrs))
181 return SetProto(cx, obj, pobj, JS_TRUE);
184 #else /* !JS_HAS_OBJ_PROTO_PROP */
186 #define object_props NULL
188 #endif /* !JS_HAS_OBJ_PROTO_PROP */
191 js_hash_object(const void *key)
193 return JSHashNumber(uintptr_t(key) >> JS_GCTHING_ALIGN);
197 MarkSharpObjects(JSContext *cx, JSObject *obj, JSIdArray **idap)
199 JSSharpObjectMap *map;
202 JSHashEntry **hep, *he;
211 JS_CHECK_RECURSION(cx, return NULL);
213 map = &cx->sharpObjectMap;
214 JS_ASSERT(map->depth >= 1);
216 hash = js_hash_object(obj);
217 hep = JS_HashTableRawLookup(table, hash, obj);
221 he = JS_HashTableRawAdd(table, hep, hash, obj, (void *) sharpid);
223 JS_ReportOutOfMemory(cx);
227 ida = JS_Enumerate(cx, obj);
232 for (i = 0, length = ida->length; i < length; i++) {
234 ok = obj->lookupProperty(cx, id, &obj2, &prop);
239 bool hasGetter, hasSetter;
240 AutoValueRooter v(cx);
241 AutoValueRooter setter(cx);
242 if (obj2->isNative()) {
243 const Shape *shape = (Shape *) prop;
244 hasGetter = shape->hasGetterValue();
245 hasSetter = shape->hasSetterValue();
247 v.set(shape->getterValue());
249 setter.set(shape->setterValue());
251 hasGetter = hasSetter = false;
254 /* Mark the getter, then set val to setter. */
255 if (hasGetter && v.value().isObject()) {
256 ok = !!MarkSharpObjects(cx, &v.value().toObject(), NULL);
260 v.set(setter.value());
261 } else if (!hasGetter) {
262 ok = obj->getProperty(cx, id, v.addr());
266 if (v.value().isObject() &&
267 !MarkSharpObjects(cx, &v.value().toObject(), NULL)) {
273 JS_DestroyIdArray(cx, ida);
277 sharpid = uintptr_t(he->value);
279 sharpid = ++map->sharpgen << SHARP_ID_SHIFT;
280 he->value = (void *) sharpid;
290 js_EnterSharpObject(JSContext *cx, JSObject *obj, JSIdArray **idap,
293 JSSharpObjectMap *map;
297 JSHashEntry *he, **hep;
302 if (!JS_CHECK_OPERATION_LIMIT(cx))
305 /* Set to null in case we return an early error. */
307 map = &cx->sharpObjectMap;
310 table = JS_NewHashTable(8, js_hash_object, JS_CompareValues,
311 JS_CompareValues, NULL, NULL);
313 JS_ReportOutOfMemory(cx);
317 JS_KEEP_ATOMS(cx->runtime);
320 /* From this point the control must flow either through out: or bad:. */
322 if (map->depth == 0) {
324 * Although MarkSharpObjects tries to avoid invoking getters,
325 * it ends up doing so anyway under some circumstances; for
326 * example, if a wrapped object has getters, the wrapper will
327 * prevent MarkSharpObjects from recognizing them as such.
328 * This could lead to js_LeaveSharpObject being called while
329 * MarkSharpObjects is still working.
331 * Increment map->depth while we call MarkSharpObjects, to
332 * ensure that such a call doesn't free the hash table we're
336 he = MarkSharpObjects(cx, obj, &ida);
340 JS_ASSERT((uintptr_t(he->value) & SHARP_BIT) == 0);
342 JS_DestroyIdArray(cx, ida);
346 hash = js_hash_object(obj);
347 hep = JS_HashTableRawLookup(table, hash, obj);
351 * It's possible that the value of a property has changed from the
352 * first time the object's properties are traversed (when the property
353 * ids are entered into the hash table) to the second (when they are
354 * converted to strings), i.e., the JSObject::getProperty() call is not
358 he = JS_HashTableRawAdd(table, hep, hash, obj, NULL);
360 JS_ReportOutOfMemory(cx);
368 sharpid = uintptr_t(he->value);
370 len = JS_snprintf(buf, sizeof buf, "#%u%c",
371 sharpid >> SHARP_ID_SHIFT,
372 (sharpid & SHARP_BIT) ? '#' : '=');
373 *sp = js_InflateString(cx, buf, &len);
376 JS_DestroyIdArray(cx, ida);
383 if ((sharpid & SHARP_BIT) == 0) {
385 ida = JS_Enumerate(cx, obj);
402 /* Clean up the sharpObjectMap table on outermost error. */
403 if (map->depth == 0) {
404 JS_UNKEEP_ATOMS(cx->runtime);
406 JS_HashTableDestroy(map->table);
413 js_LeaveSharpObject(JSContext *cx, JSIdArray **idap)
415 JSSharpObjectMap *map;
418 map = &cx->sharpObjectMap;
419 JS_ASSERT(map->depth > 0);
420 if (--map->depth == 0) {
421 JS_UNKEEP_ATOMS(cx->runtime);
423 JS_HashTableDestroy(map->table);
429 JS_DestroyIdArray(cx, ida);
436 gc_sharp_table_entry_marker(JSHashEntry *he, intN i, void *arg)
438 MarkObject((JSTracer *)arg, *(JSObject *)he->key, "sharp table entry");
439 return JS_DHASH_NEXT;
443 js_TraceSharpMap(JSTracer *trc, JSSharpObjectMap *map)
445 JS_ASSERT(map->depth > 0);
446 JS_ASSERT(map->table);
449 * During recursive calls to MarkSharpObjects a non-native object or
450 * object with a custom getProperty method can potentially return an
451 * unrooted value or even cut from the object graph an argument of one of
452 * MarkSharpObjects recursive invocations. So we must protect map->table
453 * entries against GC.
455 * We can not simply use JSTempValueRooter to mark the obj argument of
456 * MarkSharpObjects during recursion as we have to protect *all* entries
457 * in JSSharpObjectMap including those that contains otherwise unreachable
458 * objects just allocated through custom getProperty. Otherwise newer
459 * allocations can re-use the address of an object stored in the hashtable
460 * confusing js_EnterSharpObject. So to address the problem we simply
461 * mark all objects from map->table.
463 * An alternative "proper" solution is to use JSTempValueRooter in
464 * MarkSharpObjects with code to remove during finalization entries
465 * with otherwise unreachable objects. But this is way too complex
466 * to justify spending efforts.
468 JS_HashTableEnumerateEntries(map->table, gc_sharp_table_entry_marker, trc);
473 obj_toSource(JSContext *cx, uintN argc, Value *vp)
478 jschar *chars, *ochars, *vsharp;
479 const jschar *idstrchars, *vchars;
480 size_t nchars, idstrlength, gsoplength, vlength, vsharplength, curlen;
486 JSString *valstr, *str;
487 JSLinearString *idstr;
489 JS_CHECK_RECURSION(cx, return JS_FALSE);
492 PodArrayZero(localroot);
493 AutoArrayRooter tvr(cx, JS_ARRAY_LENGTH(localroot), localroot);
495 /* If outermost, we need parentheses to be an expression, not a block. */
496 JSBool outermost = (cx->sharpObjectMap.depth == 0);
498 JSObject *obj = ToObject(cx, &vp[1]);
502 if (!(he = js_EnterSharpObject(cx, obj, &ida, &chars))) {
508 * We didn't enter -- obj is already "sharp", meaning we've visited it
509 * already in our depth first search, and therefore chars contains a
510 * string of the form "#n#".
513 #if JS_HAS_SHARP_VARS
514 nchars = js_strlen(chars);
527 /* If outermost, allocate 4 + 1 for "({})" and the terminator. */
528 chars = (jschar *) cx->runtime->malloc(((outermost ? 4 : 2) + 1) * sizeof(jschar));
533 chars[nchars++] = '(';
535 /* js_EnterSharpObject returned a string of the form "#n=" in chars. */
537 nchars = js_strlen(chars);
539 js_realloc((ochars = chars), (nchars + 2 + 1) * sizeof(jschar));
546 * No need for parentheses around the whole shebang, because #n=
547 * unambiguously begins an object initializer, and never a block
550 outermost = JS_FALSE;
554 chars[nchars++] = '{';
559 * We have four local roots for cooked and raw value GC safety. Hoist the
560 * "localroot + 2" out of the loop using the val local, which refers to
561 * the raw (unconverted, "uncooked") values.
565 for (jsint i = 0, length = ida->length; i < length; i++) {
566 /* Get strings for id and value and GC-root them via vp. */
567 jsid id = ida->vector[i];
569 ok = obj->lookupProperty(cx, id, &obj2, &prop);
574 * Convert id to a value and then to a string. Decide early whether we
575 * prefer get/set or old getter/setter syntax.
577 JSString *s = js_ValueToString(cx, IdToValue(id));
578 if (!s || !(idstr = s->ensureLinear(cx))) {
582 vp->setString(idstr); /* local root */
587 if (obj2->isNative()) {
588 const Shape *shape = (Shape *) prop;
589 unsigned attrs = shape->attributes();
590 if (attrs & JSPROP_GETTER) {
592 val[valcnt] = shape->getterValue();
593 gsop[valcnt] = ATOM_TO_STRING(cx->runtime->atomState.getAtom);
596 if (attrs & JSPROP_SETTER) {
598 val[valcnt] = shape->setterValue();
599 gsop[valcnt] = ATOM_TO_STRING(cx->runtime->atomState.setAtom);
606 ok = obj->getProperty(cx, id, &val[0]);
613 * If id is a string that's not an identifier, or if it's a negative
614 * integer, then it must be quoted.
616 bool idIsLexicalIdentifier = js_IsIdentifier(idstr);
618 ? !idIsLexicalIdentifier
619 : (!JSID_IS_INT(id) || JSID_TO_INT(id) < 0)) {
620 s = js_QuoteString(cx, idstr, jschar('\''));
621 if (!s || !(idstr = s->ensureLinear(cx))) {
625 vp->setString(idstr); /* local root */
627 idstrlength = idstr->length();
628 idstrchars = idstr->getChars(cx);
634 for (jsint j = 0; j < valcnt; j++) {
636 * Censor an accessor descriptor getter or setter part if it's
639 if (gsop[j] && val[j].isUndefined())
642 /* Convert val[j] to its canonical source form. */
643 valstr = js_ValueToSource(cx, val[j]);
648 localroot[j].setString(valstr); /* local root */
649 vchars = valstr->getChars(cx);
654 vlength = valstr->length();
657 * If val[j] is a non-sharp object, and we're not serializing an
658 * accessor (ECMA syntax can't accommodate sharpened accessors),
659 * consider sharpening it.
663 #if JS_HAS_SHARP_VARS
664 if (!gsop[j] && val[j].isObject() && vchars[0] != '#') {
665 he = js_EnterSharpObject(cx, &val[j].toObject(), NULL, &vsharp);
672 vlength = js_strlen(vchars);
675 vsharplength = js_strlen(vsharp);
678 js_LeaveSharpObject(cx, NULL);
684 * Remove '(function ' from the beginning of valstr and ')' from the
685 * end so that we can put "get" in front of the function definition.
687 if (gsop[j] && IsFunctionObject(val[j])) {
688 const jschar *start = vchars;
689 const jschar *end = vchars + vlength;
691 uint8 parenChomp = 0;
692 if (vchars[0] == '(') {
697 /* Try to jump "function" keyword. */
699 vchars = js_strchr_limit(vchars, ' ', end);
702 * Jump over the function's name: it can't be encoded as part
703 * of an ECMA getter or setter.
706 vchars = js_strchr_limit(vchars, '(', end);
711 vlength = end - vchars - parenChomp;
718 #define SAFE_ADD(n) \
729 SAFE_ADD(idstrlength + 1);
731 SAFE_ADD(gsop[j]->length() + 1);
732 SAFE_ADD(vsharplength);
734 /* Account for the trailing null. */
735 SAFE_ADD((outermost ? 2 : 1) + 1);
738 if (curlen > size_t(-1) / sizeof(jschar))
741 /* Allocate 1 + 1 at end for closing brace and terminating 0. */
742 chars = (jschar *) js_realloc((ochars = chars), curlen * sizeof(jschar));
749 chars[nchars++] = comma[0];
750 chars[nchars++] = comma[1];
755 gsoplength = gsop[j]->length();
756 const jschar *gsopchars = gsop[j]->getChars(cx);
759 js_strncpy(&chars[nchars], gsopchars, gsoplength);
760 nchars += gsoplength;
761 chars[nchars++] = ' ';
763 js_strncpy(&chars[nchars], idstrchars, idstrlength);
764 nchars += idstrlength;
765 /* Extraneous space after id here will be extracted later */
766 chars[nchars++] = gsop[j] ? ' ' : ':';
769 js_strncpy(&chars[nchars], vsharp, vsharplength);
770 nchars += vsharplength;
772 js_strncpy(&chars[nchars], vchars, vlength);
780 chars[nchars++] = '}';
782 chars[nchars++] = ')';
786 js_LeaveSharpObject(cx, &ida);
795 JS_ReportOutOfMemory(cx);
800 str = js_NewString(cx, chars, nchars);
817 #endif /* JS_HAS_TOSOURCE */
822 obj_toStringHelper(JSContext *cx, JSObject *obj)
825 return JSProxy::obj_toString(cx, obj);
827 const char *clazz = obj->getClass()->name;
828 size_t nchars = 9 + strlen(clazz); /* 9 for "[object ]" */
829 jschar *chars = (jschar *) cx->malloc((nchars + 1) * sizeof(jschar));
833 const char *prefix = "[object ";
835 while ((chars[nchars] = (jschar)*prefix) != 0)
837 while ((chars[nchars] = (jschar)*clazz) != 0)
839 chars[nchars++] = ']';
842 JSString *str = js_NewString(cx, chars, nchars);
850 /* ES5 15.2.4.2. Note steps 1 and 2 are errata. */
852 obj_toString(JSContext *cx, uintN argc, Value *vp)
854 Value &thisv = vp[1];
857 if (thisv.isUndefined()) {
858 vp->setString(ATOM_TO_STRING(cx->runtime->atomState.objectUndefinedAtom));
863 if (thisv.isNull()) {
864 vp->setString(ATOM_TO_STRING(cx->runtime->atomState.objectNullAtom));
869 JSObject *obj = ToObject(cx, &thisv);
874 JSString *str = js::obj_toStringHelper(cx, obj);
882 obj_toLocaleString(JSContext *cx, uintN argc, Value *vp)
884 JSObject *obj = ToObject(cx, &vp[1]);
888 JSString *str = js_ValueToString(cx, ObjectValue(*obj));
897 obj_valueOf(JSContext *cx, uintN argc, Value *vp)
899 JSObject *obj = ToObject(cx, &vp[1]);
907 * Check if CSP allows new Function() or eval() to run in the current
911 js_CheckContentSecurityPolicy(JSContext *cx, JSObject *scopeobj)
913 // CSP is static per document, so if our check said yes before, that
914 // answer is still valid.
915 JSObject *global = scopeobj->getGlobal();
916 Value v = global->getReservedSlot(JSRESERVED_GLOBAL_EVAL_ALLOWED);
917 if (v.isUndefined()) {
918 JSSecurityCallbacks *callbacks = JS_GetSecurityCallbacks(cx);
920 // if there are callbacks, make sure that the CSP callback is installed and
921 // that it permits eval().
922 v.setBoolean((!callbacks || !callbacks->contentSecurityPolicyAllows) ||
923 callbacks->contentSecurityPolicyAllows(cx));
925 // update the cache in the global object for the result of the security check
926 js_SetReservedSlot(cx, global, JSRESERVED_GLOBAL_EVAL_ALLOWED, v);
932 * Check whether principals subsumes scopeobj's principals, and return true
933 * if so (or if scopeobj has no principals, for backward compatibility with
934 * the JS API, which does not require principals), and false otherwise.
937 js_CheckPrincipalsAccess(JSContext *cx, JSObject *scopeobj,
938 JSPrincipals *principals, JSAtom *caller)
940 JSSecurityCallbacks *callbacks;
941 JSPrincipals *scopePrincipals;
943 callbacks = JS_GetSecurityCallbacks(cx);
944 if (callbacks && callbacks->findObjectPrincipals) {
945 scopePrincipals = callbacks->findObjectPrincipals(cx, scopeobj);
946 if (!principals || !scopePrincipals ||
947 !principals->subsume(principals, scopePrincipals)) {
948 JSAutoByteString callerstr;
949 if (!js_AtomToPrintableString(cx, caller, &callerstr))
951 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
952 JSMSG_BAD_INDIRECT_CALL, callerstr.ptr());
960 CheckScopeChainValidity(JSContext *cx, JSObject *scopeobj)
962 JSObject *inner = scopeobj;
963 OBJ_TO_INNER_OBJECT(cx, inner);
966 JS_ASSERT(inner == scopeobj);
968 /* XXX This is an awful gross hack. */
970 JSObjectOp op = scopeobj->getClass()->ext.innerObject;
971 if (op && op(cx, scopeobj) != scopeobj) {
972 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_BAD_INDIRECT_CALL,
976 scopeobj = scopeobj->getParent();
983 js_ComputeFilename(JSContext *cx, JSStackFrame *caller,
984 JSPrincipals *principals, uintN *linenop)
988 JSSecurityCallbacks *callbacks = JS_GetSecurityCallbacks(cx);
991 JS_ASSERT(principals || !(callbacks && callbacks->findObjectPrincipals));
992 flags = JS_GetScriptFilenameFlags(caller->script());
993 if ((flags & JSFILENAME_PROTECTED) &&
995 strcmp(principals->codebase, "[System Principal]")) {
997 return principals->codebase;
1000 jsbytecode *pc = caller->pc(cx);
1001 if (pc && js_GetOpcode(cx, caller->script(), pc) == JSOP_EVAL) {
1002 JS_ASSERT(js_GetOpcode(cx, caller->script(), pc + JSOP_EVAL_LENGTH) == JSOP_LINENO);
1003 *linenop = GET_UINT16(pc + JSOP_EVAL_LENGTH);
1005 *linenop = js_FramePCToLineNumber(cx, caller);
1007 return caller->script()->filename;
1010 #ifndef EVAL_CACHE_CHAIN_LIMIT
1011 # define EVAL_CACHE_CHAIN_LIMIT 4
1014 static inline JSScript **
1015 EvalCacheHash(JSContext *cx, JSLinearString *str)
1017 const jschar *s = str->chars();
1018 size_t n = str->length();
1023 for (h = 0; n; s++, n--)
1024 h = JS_ROTATE_LEFT32(h, 4) ^ *s;
1026 h *= JS_GOLDEN_RATIO;
1027 h >>= 32 - JS_EVAL_CACHE_SHIFT;
1028 return &JS_SCRIPTS_TO_GC(cx)[h];
1031 static JS_ALWAYS_INLINE JSScript *
1032 EvalCacheLookup(JSContext *cx, JSLinearString *str, JSStackFrame *caller, uintN staticLevel,
1033 JSPrincipals *principals, JSObject *scopeobj, JSScript **bucket)
1036 * Cache local eval scripts indexed by source qualified by scope.
1038 * An eval cache entry should never be considered a hit unless its
1039 * strictness matches that of the new eval code. The existing code takes
1040 * care of this, because hits are qualified by the function from which
1041 * eval was called, whose strictness doesn't change. (We don't cache evals
1042 * in eval code, so the calling function corresponds to the calling script,
1043 * and its strictness never varies.) Scripts produced by calls to eval from
1044 * global code aren't cached.
1046 * FIXME bug 620141: Qualify hits by calling script rather than function.
1047 * Then we wouldn't need the unintuitive !isEvalFrame() hack in EvalKernel
1048 * to avoid caching nested evals in functions (thus potentially mismatching
1049 * on strict mode), and we could cache evals in global code if desired.
1052 JSScript **scriptp = bucket;
1054 EVAL_CACHE_METER(probe);
1055 JSVersion version = cx->findVersion();
1057 while ((script = *scriptp) != NULL) {
1058 if (script->savedCallerFun &&
1059 script->staticLevel == staticLevel &&
1060 script->getVersion() == version &&
1061 !script->hasSingletons &&
1062 (script->principals == principals ||
1063 (principals->subsume(principals, script->principals) &&
1064 script->principals->subsume(script->principals, principals)))) {
1066 * Get the prior (cache-filling) eval's saved caller function.
1067 * See Compiler::compileScript in jsparse.cpp.
1069 JSFunction *fun = script->getFunction(0);
1071 if (fun == caller->fun()) {
1073 * Get the source string passed for safekeeping in the
1074 * atom map by the prior eval to Compiler::compileScript.
1076 JSAtom *src = script->atomMap.vector[0];
1078 if (src == str || EqualStrings(src, str)) {
1080 * Source matches, qualify by comparing scopeobj to the
1081 * COMPILE_N_GO-memoized parent of the first literal
1082 * function or regexp object if any. If none, then this
1083 * script has no compiled-in dependencies on the prior
1086 JSObjectArray *objarray = script->objects();
1089 if (objarray->length == 1) {
1090 if (JSScript::isValidOffset(script->regexpsOffset)) {
1091 objarray = script->regexps();
1094 EVAL_CACHE_METER(noscope);
1099 objarray->vector[i]->getParent() == scopeobj) {
1100 JS_ASSERT(staticLevel == script->staticLevel);
1101 EVAL_CACHE_METER(hit);
1102 *scriptp = script->u.nextToGC;
1103 script->u.nextToGC = NULL;
1110 if (++count == EVAL_CACHE_CHAIN_LIMIT)
1112 EVAL_CACHE_METER(step);
1113 scriptp = &script->u.nextToGC;
1120 eval(JSContext *cx, uintN argc, Value *vp)
1123 * NB: This method handles only indirect eval: direct eval is handled by
1127 JSStackFrame *caller = js_GetScriptedCaller(cx, NULL);
1129 /* FIXME Bug 602994: This really should be perfectly cromulent. */
1131 /* Eval code needs to inherit principals from the caller. */
1132 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
1133 JSMSG_BAD_INDIRECT_CALL, js_eval_str);
1137 return EvalKernel(cx, argc, vp, INDIRECT_EVAL, caller, vp[0].toObject().getGlobal());
1143 EvalKernel(JSContext *cx, uintN argc, Value *vp, EvalType evalType, JSStackFrame *caller,
1147 * FIXME Bug 602994: Calls with no scripted caller should be permitted and
1148 * should be implemented as indirect calls.
1151 JS_ASSERT(scopeobj);
1154 * We once supported a second argument to eval to use as the scope chain
1155 * when evaluating the code string. Warn when such uses are seen so that
1156 * authors will know that support for eval(s, o) has been removed.
1158 JSScript *callerScript = caller->script();
1159 if (argc > 1 && !callerScript->warnedAboutTwoArgumentEval) {
1160 static const char TWO_ARGUMENT_WARNING[] =
1161 "Support for eval(code, scopeObject) has been removed. "
1162 "Use |with (scopeObject) eval(code);| instead.";
1163 if (!JS_ReportWarning(cx, TWO_ARGUMENT_WARNING))
1165 callerScript->warnedAboutTwoArgumentEval = true;
1169 * CSP check: Is eval() allowed at all?
1170 * Report errors via CSP is done in the script security mgr.
1172 if (!js_CheckContentSecurityPolicy(cx, scopeobj)) {
1173 JS_ReportError(cx, "call to eval() blocked by CSP");
1177 /* ES5 15.1.2.1 step 1. */
1182 if (!vp[2].isString()) {
1186 JSString *str = vp[2].toString();
1188 /* ES5 15.1.2.1 steps 2-8. */
1189 JSObject *callee = JSVAL_TO_OBJECT(JS_CALLEE(cx, Jsvalify(vp)));
1190 JS_ASSERT(IsBuiltinEvalFunction(callee->getFunctionPrivate()));
1191 JSPrincipals *principals = js_EvalFramePrincipals(cx, callee, caller);
1194 * Per ES5, indirect eval runs in the global scope. (eval is specified this
1195 * way so that the compiler can make assumptions about what bindings may or
1196 * may not exist in the current frame if it doesn't see 'eval'.)
1199 if (evalType == DIRECT_EVAL) {
1200 staticLevel = caller->script()->staticLevel + 1;
1203 jsbytecode *callerPC = caller->pc(cx);
1204 JS_ASSERT_IF(caller->isFunctionFrame(), caller->hasCallObj());
1205 JS_ASSERT(callerPC && js_GetOpcode(cx, caller->script(), callerPC) == JSOP_EVAL);
1208 /* Pretend that we're top level. */
1211 JS_ASSERT(scopeobj == scopeobj->getGlobal());
1212 JS_ASSERT(scopeobj->isGlobal());
1215 /* Ensure we compile this eval with the right object in the scope chain. */
1216 if (!CheckScopeChainValidity(cx, scopeobj))
1219 JSLinearString *linearStr = str->ensureLinear(cx);
1222 const jschar *chars = linearStr->chars();
1223 size_t length = linearStr->length();
1226 * If the eval string starts with '(' and ends with ')', it may be JSON.
1227 * Try the JSON parser first because it's much faster. If the eval string
1228 * isn't JSON, JSON parsing will probably fail quickly, so little time
1231 if (length > 2 && chars[0] == '(' && chars[length - 1] == ')') {
1232 JSONParser *jp = js_BeginJSONParse(cx, vp, /* suppressErrors = */true);
1234 /* Run JSON-parser on string inside ( and ). */
1235 bool ok = js_ConsumeJSONText(cx, jp, chars + 1, length - 2);
1236 ok &= js_FinishJSONParse(cx, jp, NullValue());
1243 * Direct calls to eval are supposed to see the caller's |this|. If we
1244 * haven't wrapped that yet, do so now, before we make a copy of it for
1245 * the eval code to use.
1247 if (evalType == DIRECT_EVAL && !caller->computeThis(cx))
1250 JSScript *script = NULL;
1251 JSScript **bucket = EvalCacheHash(cx, linearStr);
1252 if (evalType == DIRECT_EVAL && caller->isFunctionFrame() && !caller->isEvalFrame()) {
1253 script = EvalCacheLookup(cx, linearStr, caller, staticLevel, principals, scopeobj, bucket);
1256 * Although the eval cache keeps a script alive from the perspective of
1257 * the JS engine, from a jsdbgapi user's perspective each eval()
1258 * creates and destroys a script. This hides implementation details and
1259 * allows jsdbgapi clients to avoid calling JS_GetScriptObject after a
1260 * script has been returned to the eval cache, which is invalid since
1261 * script->u.object aliases script->u.nextToGC.
1264 js_CallNewScriptHook(cx, script, NULL);
1265 MUST_FLOW_THROUGH("destroy");
1270 * We can't have a callerFrame (down in js::Execute's terms) if we're in
1271 * global code (or if we're an indirect eval).
1273 JSStackFrame *callerFrame = (staticLevel != 0) ? caller : NULL;
1276 const char *filename = js_ComputeFilename(cx, caller, principals, &lineno);
1278 uint32 tcflags = TCF_COMPILE_N_GO | TCF_NEED_MUTABLE_SCRIPT | TCF_COMPILE_FOR_EVAL;
1279 script = Compiler::compileScript(cx, scopeobj, callerFrame,
1280 principals, tcflags, chars, length,
1281 filename, lineno, cx->findVersion(),
1282 linearStr, staticLevel);
1287 assertSameCompartment(cx, scopeobj, script);
1290 * Belt-and-braces: check that the lesser of eval's principals and the
1291 * caller's principals has access to scopeobj.
1293 JSBool ok = js_CheckPrincipalsAccess(cx, scopeobj, principals,
1294 cx->runtime->atomState.evalAtom) &&
1295 Execute(cx, scopeobj, script, callerFrame, JSFRAME_EVAL, vp);
1297 MUST_FLOW_LABEL(destroy);
1298 js_CallDestroyScriptHook(cx, script);
1300 script->u.nextToGC = *bucket;
1302 #ifdef CHECK_SCRIPT_OWNER
1303 script->owner = NULL;
1310 IsBuiltinEvalFunction(JSFunction *fun)
1312 return fun->maybeNative() == eval;
1317 #if JS_HAS_OBJ_WATCHPOINT
1320 obj_watch_handler(JSContext *cx, JSObject *obj, jsid id, jsval old,
1321 jsval *nvp, void *closure)
1324 JSSecurityCallbacks *callbacks;
1325 JSStackFrame *caller;
1326 JSPrincipals *subject, *watcher;
1328 JSResolvingEntry *entry;
1333 callable = (JSObject *) closure;
1335 callbacks = JS_GetSecurityCallbacks(cx);
1336 if (callbacks && callbacks->findObjectPrincipals) {
1337 /* Skip over any obj_watch_* frames between us and the real subject. */
1338 caller = js_GetScriptedCaller(cx, NULL);
1341 * Only call the watch handler if the watcher is allowed to watch
1342 * the currently executing script.
1344 watcher = callbacks->findObjectPrincipals(cx, callable);
1345 subject = js_StackFramePrincipals(cx, caller);
1347 if (watcher && subject && !watcher->subsume(watcher, subject)) {
1348 /* Silently don't call the watch handler. */
1354 /* Avoid recursion on (obj, id) already being watched on cx. */
1357 if (!js_StartResolving(cx, &key, JSRESFLAG_WATCH, &entry))
1361 generation = cx->resolvingTable->generation;
1363 argv[0] = IdToValue(id);
1364 argv[1] = Valueify(old);
1365 argv[2] = Valueify(*nvp);
1366 ok = ExternalInvoke(cx, ObjectValue(*obj), ObjectOrNullValue(callable), 3, argv,
1368 js_StopResolving(cx, &key, JSRESFLAG_WATCH, entry, generation);
1373 obj_watch(JSContext *cx, uintN argc, Value *vp)
1376 js_ReportMissingArg(cx, *vp, 1);
1380 JSObject *callable = js_ValueToCallableObject(cx, &vp[3], 0);
1384 /* Compute the unique int/atom symbol id needed by js_LookupProperty. */
1386 if (!ValueToId(cx, vp[2], &propid))
1389 JSObject *obj = ToObject(cx, &vp[1]);
1395 if (!CheckAccess(cx, obj, propid, JSACC_WATCH, &tmp, &attrs))
1400 if (attrs & JSPROP_READONLY)
1402 if (obj->isDenseArray() && !obj->makeDenseArraySlow(cx))
1404 return JS_SetWatchPoint(cx, obj, propid, obj_watch_handler, callable);
1408 obj_unwatch(JSContext *cx, uintN argc, Value *vp)
1410 JSObject *obj = ToObject(cx, &vp[1]);
1416 if (!ValueToId(cx, vp[2], &id))
1421 return JS_ClearWatchPoint(cx, obj, id, NULL, NULL);
1424 #endif /* JS_HAS_OBJ_WATCHPOINT */
1427 * Prototype and property query methods, to complement the 'in' and
1428 * 'instanceof' operators.
1431 /* Proposed ECMA 15.2.4.5. */
1433 obj_hasOwnProperty(JSContext *cx, uintN argc, Value *vp)
1435 JSObject *obj = ToObject(cx, &vp[1]);
1438 return js_HasOwnPropertyHelper(cx, obj->getOps()->lookupProperty, argc, vp);
1442 js_HasOwnPropertyHelper(JSContext *cx, LookupPropOp lookup, uintN argc,
1446 if (!ValueToId(cx, argc != 0 ? vp[2] : UndefinedValue(), &id))
1449 JSObject *obj = ToObject(cx, &vp[1]);
1454 if (obj->isProxy()) {
1456 if (!JSProxy::hasOwn(cx, obj, id, &has))
1458 vp->setBoolean(has);
1461 if (!js_HasOwnProperty(cx, lookup, obj, id, &obj2, &prop))
1463 vp->setBoolean(!!prop);
1468 js_HasOwnProperty(JSContext *cx, LookupPropOp lookup, JSObject *obj, jsid id,
1469 JSObject **objp, JSProperty **propp)
1471 JSAutoResolveFlags rf(cx, JSRESOLVE_QUALIFIED | JSRESOLVE_DETECTING);
1472 if (!(lookup ? lookup : js_LookupProperty)(cx, obj, id, objp, propp))
1480 Class *clasp = (*objp)->getClass();
1481 JSObject *outer = NULL;
1482 if (JSObjectOp op = (*objp)->getClass()->ext.outerObject) {
1483 outer = op(cx, *objp);
1488 if (outer != *objp) {
1489 if ((*objp)->isNative() && obj->getClass() == clasp) {
1491 * The combination of JSPROP_SHARED and JSPROP_PERMANENT in a
1492 * delegated property makes that property appear to be direct in
1493 * all delegating instances of the same native class. This hack
1494 * avoids bloating every function instance with its own 'length'
1495 * (AKA 'arity') property. But it must not extend across class
1496 * boundaries, to avoid making hasOwnProperty lie (bug 320854).
1498 * It's not really a hack, of course: a permanent property can't
1499 * be deleted, and JSPROP_SHARED means "don't allocate a slot in
1500 * any instance, prototype or delegating". Without a slot, and
1501 * without the ability to remove and recreate (with differences)
1502 * the property, there is no way to tell whether it is directly
1503 * owned, or indirectly delegated.
1505 Shape *shape = reinterpret_cast<Shape *>(*propp);
1506 if (shape->isSharedPermanent())
1517 obj_isPrototypeOf(JSContext *cx, uintN argc, Value *vp)
1520 if (argc < 1 || !vp[2].isObject()) {
1521 vp->setBoolean(false);
1526 JSObject *obj = ToObject(cx, &vp[1]);
1531 vp->setBoolean(js_IsDelegate(cx, obj, vp[2]));
1537 obj_propertyIsEnumerable(JSContext *cx, uintN argc, Value *vp)
1541 if (!ValueToId(cx, argc != 0 ? vp[2] : UndefinedValue(), &id))
1545 JSObject *obj = ToObject(cx, &vp[1]);
1550 return js_PropertyIsEnumerable(cx, obj, id, vp);
1554 js_PropertyIsEnumerable(JSContext *cx, JSObject *obj, jsid id, Value *vp)
1558 if (!obj->lookupProperty(cx, id, &pobj, &prop))
1562 vp->setBoolean(false);
1567 * XXX ECMA spec error compatible: return false unless hasOwnProperty.
1568 * The ECMA spec really should be fixed so propertyIsEnumerable and the
1569 * for..in loop agree on whether prototype properties are enumerable,
1570 * obviously by fixing this method (not by breaking the for..in loop!).
1572 * We check here for shared permanent prototype properties, which should
1573 * be treated as if they are local to obj. They are an implementation
1574 * technique used to satisfy ECMA requirements; users should not be able
1575 * to distinguish a shared permanent proto-property from a local one.
1579 if (pobj->isNative()) {
1580 Shape *shape = (Shape *) prop;
1581 shared = shape->isSharedPermanent();
1582 attrs = shape->attributes();
1585 if (!pobj->getAttributes(cx, id, &attrs))
1588 if (pobj != obj && !shared) {
1589 vp->setBoolean(false);
1592 vp->setBoolean((attrs & JSPROP_ENUMERATE) != 0);
1596 #if OLD_GETTER_SETTER_METHODS
1598 const char js_defineGetter_str[] = "__defineGetter__";
1599 const char js_defineSetter_str[] = "__defineSetter__";
1600 const char js_lookupGetter_str[] = "__lookupGetter__";
1601 const char js_lookupSetter_str[] = "__lookupSetter__";
1603 JS_FRIEND_API(JSBool)
1604 js_obj_defineGetter(JSContext *cx, uintN argc, Value *vp)
1606 if (!BoxThisForVp(cx, vp))
1608 JSObject *obj = &vp[1].toObject();
1610 if (argc <= 1 || !js_IsCallable(vp[3])) {
1611 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
1612 JSMSG_BAD_GETTER_OR_SETTER,
1616 PropertyOp getter = CastAsPropertyOp(&vp[3].toObject());
1619 if (!ValueToId(cx, vp[2], &id))
1621 if (!CheckRedeclaration(cx, obj, id, JSPROP_GETTER))
1624 * Getters and setters are just like watchpoints from an access
1625 * control point of view.
1629 if (!CheckAccess(cx, obj, id, JSACC_WATCH, &junk, &attrs))
1632 return obj->defineProperty(cx, id, UndefinedValue(), getter, StrictPropertyStub,
1633 JSPROP_ENUMERATE | JSPROP_GETTER | JSPROP_SHARED);
1636 JS_FRIEND_API(JSBool)
1637 js_obj_defineSetter(JSContext *cx, uintN argc, Value *vp)
1639 if (!BoxThisForVp(cx, vp))
1641 JSObject *obj = &vp[1].toObject();
1643 if (argc <= 1 || !js_IsCallable(vp[3])) {
1644 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
1645 JSMSG_BAD_GETTER_OR_SETTER,
1649 StrictPropertyOp setter = CastAsStrictPropertyOp(&vp[3].toObject());
1652 if (!ValueToId(cx, vp[2], &id))
1654 if (!CheckRedeclaration(cx, obj, id, JSPROP_SETTER))
1657 * Getters and setters are just like watchpoints from an access
1658 * control point of view.
1662 if (!CheckAccess(cx, obj, id, JSACC_WATCH, &junk, &attrs))
1665 return obj->defineProperty(cx, id, UndefinedValue(), PropertyStub, setter,
1666 JSPROP_ENUMERATE | JSPROP_SETTER | JSPROP_SHARED);
1670 obj_lookupGetter(JSContext *cx, uintN argc, Value *vp)
1673 if (!ValueToId(cx, argc != 0 ? vp[2] : UndefinedValue(), &id))
1675 JSObject *obj = ToObject(cx, &vp[1]);
1680 if (!obj->lookupProperty(cx, id, &pobj, &prop))
1684 if (pobj->isNative()) {
1685 Shape *shape = (Shape *) prop;
1686 if (shape->hasGetterValue())
1687 *vp = shape->getterValue();
1694 obj_lookupSetter(JSContext *cx, uintN argc, Value *vp)
1697 if (!ValueToId(cx, argc != 0 ? vp[2] : UndefinedValue(), &id))
1699 JSObject *obj = ToObject(cx, &vp[1]);
1704 if (!obj->lookupProperty(cx, id, &pobj, &prop))
1708 if (pobj->isNative()) {
1709 Shape *shape = (Shape *) prop;
1710 if (shape->hasSetterValue())
1711 *vp = shape->setterValue();
1716 #endif /* OLD_GETTER_SETTER_METHODS */
1719 obj_getPrototypeOf(JSContext *cx, uintN argc, Value *vp)
1722 js_ReportMissingArg(cx, *vp, 0);
1726 if (vp[2].isPrimitive()) {
1727 char *bytes = DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, vp[2], NULL);
1730 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
1731 JSMSG_UNEXPECTED_TYPE, bytes, "not an object");
1736 JSObject *obj = &vp[2].toObject();
1738 return CheckAccess(cx, obj, ATOM_TO_JSID(cx->runtime->atomState.protoAtom),
1739 JSACC_PROTO, vp, &attrs);
1743 js_NewPropertyDescriptorObject(JSContext *cx, jsid id, uintN attrs,
1744 const Value &getter, const Value &setter,
1745 const Value &value, Value *vp)
1747 /* We have our own property, so start creating the descriptor. */
1748 JSObject *desc = NewBuiltinClassInstance(cx, &js_ObjectClass);
1751 vp->setObject(*desc); /* Root and return. */
1753 const JSAtomState &atomState = cx->runtime->atomState;
1754 if (attrs & (JSPROP_GETTER | JSPROP_SETTER)) {
1755 if (!desc->defineProperty(cx, ATOM_TO_JSID(atomState.getAtom), getter,
1756 PropertyStub, StrictPropertyStub, JSPROP_ENUMERATE) ||
1757 !desc->defineProperty(cx, ATOM_TO_JSID(atomState.setAtom), setter,
1758 PropertyStub, StrictPropertyStub, JSPROP_ENUMERATE)) {
1762 if (!desc->defineProperty(cx, ATOM_TO_JSID(atomState.valueAtom), value,
1763 PropertyStub, StrictPropertyStub, JSPROP_ENUMERATE) ||
1764 !desc->defineProperty(cx, ATOM_TO_JSID(atomState.writableAtom),
1765 BooleanValue((attrs & JSPROP_READONLY) == 0),
1766 PropertyStub, StrictPropertyStub, JSPROP_ENUMERATE)) {
1771 return desc->defineProperty(cx, ATOM_TO_JSID(atomState.enumerableAtom),
1772 BooleanValue((attrs & JSPROP_ENUMERATE) != 0),
1773 PropertyStub, StrictPropertyStub, JSPROP_ENUMERATE) &&
1774 desc->defineProperty(cx, ATOM_TO_JSID(atomState.configurableAtom),
1775 BooleanValue((attrs & JSPROP_PERMANENT) == 0),
1776 PropertyStub, StrictPropertyStub, JSPROP_ENUMERATE);
1780 js_GetOwnPropertyDescriptor(JSContext *cx, JSObject *obj, jsid id, Value *vp)
1783 return JSProxy::getOwnPropertyDescriptor(cx, obj, id, false, vp);
1787 if (!js_HasOwnProperty(cx, obj->getOps()->lookupProperty, obj, id, &pobj, &prop))
1794 Value roots[] = { UndefinedValue(), UndefinedValue(), UndefinedValue() };
1795 AutoArrayRooter tvr(cx, JS_ARRAY_LENGTH(roots), roots);
1798 if (pobj->isNative()) {
1799 Shape *shape = (Shape *) prop;
1800 attrs = shape->attributes();
1801 if (attrs & (JSPROP_GETTER | JSPROP_SETTER)) {
1803 if (attrs & JSPROP_GETTER)
1804 roots[0] = shape->getterValue();
1805 if (attrs & JSPROP_SETTER)
1806 roots[1] = shape->setterValue();
1809 if (!pobj->getAttributes(cx, id, &attrs))
1813 if (doGet && !obj->getProperty(cx, id, &roots[2]))
1816 return js_NewPropertyDescriptorObject(cx, id,
1818 roots[0], /* getter */
1819 roots[1], /* setter */
1820 roots[2], /* value */
1825 GetFirstArgumentAsObject(JSContext *cx, uintN argc, Value *vp, const char *method, JSObject **objp)
1828 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_MORE_ARGS_NEEDED,
1833 const Value &v = vp[2];
1834 if (!v.isObject()) {
1835 char *bytes = DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, v, NULL);
1838 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_UNEXPECTED_TYPE,
1839 bytes, "not an object");
1844 *objp = &v.toObject();
1849 obj_getOwnPropertyDescriptor(JSContext *cx, uintN argc, Value *vp)
1852 if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.getOwnPropertyDescriptor", &obj))
1854 AutoIdRooter nameidr(cx);
1855 if (!ValueToId(cx, argc >= 2 ? vp[3] : UndefinedValue(), nameidr.addr()))
1857 return js_GetOwnPropertyDescriptor(cx, obj, nameidr.id(), vp);
1861 obj_keys(JSContext *cx, uintN argc, Value *vp)
1864 if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.keys", &obj))
1867 AutoIdVector props(cx);
1868 if (!GetPropertyNames(cx, obj, JSITER_OWNONLY, &props))
1871 AutoValueVector vals(cx);
1872 if (!vals.reserve(props.length()))
1874 for (size_t i = 0, len = props.length(); i < len; i++) {
1876 if (JSID_IS_STRING(id)) {
1877 JS_ALWAYS_TRUE(vals.append(StringValue(JSID_TO_STRING(id))));
1878 } else if (JSID_IS_INT(id)) {
1879 JSString *str = js_IntToString(cx, JSID_TO_INT(id));
1882 JS_ALWAYS_TRUE(vals.append(StringValue(str)));
1884 JS_ASSERT(JSID_IS_OBJECT(id));
1888 JS_ASSERT(props.length() <= UINT32_MAX);
1889 JSObject *aobj = NewDenseCopiedArray(cx, jsuint(vals.length()), vals.begin());
1892 vp->setObject(*aobj);
1898 HasProperty(JSContext* cx, JSObject* obj, jsid id, Value* vp, bool *foundp)
1900 if (!obj->hasProperty(cx, id, foundp, JSRESOLVE_QUALIFIED | JSRESOLVE_DETECTING))
1908 * We must go through the method read barrier in case id is 'get' or 'set'.
1909 * There is no obvious way to defer cloning a joined function object whose
1910 * identity will be used by DefinePropertyOnObject, e.g., or reflected via
1911 * js_GetOwnPropertyDescriptor, as the getter or setter callable object.
1913 return !!obj->getProperty(cx, id, vp);
1916 PropDesc::PropDesc()
1917 : pd(UndefinedValue()),
1919 value(UndefinedValue()),
1920 get(UndefinedValue()),
1921 set(UndefinedValue()),
1927 hasEnumerable(false),
1928 hasConfigurable(false)
1933 PropDesc::initialize(JSContext* cx, jsid id, const Value &origval)
1939 if (v.isPrimitive()) {
1940 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_NOT_NONNULL_OBJECT);
1943 JSObject* desc = &v.toObject();
1945 /* Make a copy of the descriptor. We might need it later. */
1948 /* Start with the proper defaults. */
1949 attrs = JSPROP_PERMANENT | JSPROP_READONLY;
1954 #ifdef __GNUC__ /* quell GCC overwarning */
1957 if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.enumerableAtom), &v, &found))
1960 hasEnumerable = JS_TRUE;
1961 if (js_ValueToBoolean(v))
1962 attrs |= JSPROP_ENUMERATE;
1966 if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.configurableAtom), &v, &found))
1969 hasConfigurable = JS_TRUE;
1970 if (js_ValueToBoolean(v))
1971 attrs &= ~JSPROP_PERMANENT;
1975 if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.valueAtom), &v, &found))
1983 if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.writableAtom), &v, &found))
1986 hasWritable = JS_TRUE;
1987 if (js_ValueToBoolean(v))
1988 attrs &= ~JSPROP_READONLY;
1992 if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.getAtom), &v, &found))
1995 if ((v.isPrimitive() || !js_IsCallable(v)) && !v.isUndefined()) {
1996 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_BAD_GET_SET_FIELD,
2002 attrs |= JSPROP_GETTER | JSPROP_SHARED;
2006 if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.setAtom), &v, &found))
2009 if ((v.isPrimitive() || !js_IsCallable(v)) && !v.isUndefined()) {
2010 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_BAD_GET_SET_FIELD,
2016 attrs |= JSPROP_SETTER | JSPROP_SHARED;
2020 if ((hasGet || hasSet) && (hasValue || hasWritable)) {
2021 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_INVALID_DESCRIPTOR);
2029 Reject(JSContext *cx, uintN errorNumber, bool throwError, jsid id, bool *rval)
2033 if (!js_ValueToStringId(cx, IdToValue(id), &idstr))
2035 JSAutoByteString bytes(cx, JSID_TO_STRING(idstr));
2038 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, errorNumber, bytes.ptr());
2047 Reject(JSContext *cx, JSObject *obj, uintN errorNumber, bool throwError, bool *rval)
2050 if (js_ErrorFormatString[errorNumber].argCount == 1) {
2051 js_ReportValueErrorFlags(cx, JSREPORT_ERROR, errorNumber,
2052 JSDVG_IGNORE_STACK, ObjectValue(*obj),
2055 JS_ASSERT(js_ErrorFormatString[errorNumber].argCount == 0);
2056 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, errorNumber);
2066 DefinePropertyOnObject(JSContext *cx, JSObject *obj, const PropDesc &desc,
2067 bool throwError, bool *rval)
2069 /* 8.12.9 step 1. */
2070 JSProperty *current;
2072 JS_ASSERT(!obj->getOps()->lookupProperty);
2073 if (!js_HasOwnProperty(cx, NULL, obj, desc.id, &obj2, ¤t))
2076 JS_ASSERT(!obj->getOps()->defineProperty);
2079 * If we find a shared permanent property in a different object obj2 from
2080 * obj, then if the property is shared permanent (an old hack to optimize
2081 * per-object properties into one prototype property), ignore that lookup
2082 * result (null current).
2084 * FIXME: bug 575997 (see also bug 607863).
2086 if (current && obj2 != obj && obj2->isNative()) {
2087 /* See same assertion with comment further below. */
2088 JS_ASSERT(obj2->getClass() == obj->getClass());
2090 Shape *shape = (Shape *) current;
2091 if (shape->isSharedPermanent())
2095 /* 8.12.9 steps 2-4. */
2097 if (!obj->isExtensible())
2098 return Reject(cx, obj, JSMSG_OBJECT_NOT_EXTENSIBLE, throwError, rval);
2102 if (desc.isGenericDescriptor() || desc.isDataDescriptor()) {
2103 JS_ASSERT(!obj->getOps()->defineProperty);
2104 return js_DefineProperty(cx, obj, desc.id, &desc.value,
2105 PropertyStub, StrictPropertyStub, desc.attrs);
2108 JS_ASSERT(desc.isAccessorDescriptor());
2111 * Getters and setters are just like watchpoints from an access
2112 * control point of view.
2116 if (!CheckAccess(cx, obj, desc.id, JSACC_WATCH, &dummy, &dummyAttrs))
2119 Value tmp = UndefinedValue();
2120 return js_DefineProperty(cx, obj, desc.id, &tmp,
2121 desc.getter(), desc.setter(), desc.attrs);
2124 /* 8.12.9 steps 5-6 (note 5 is merely a special case of 6). */
2125 Value v = UndefinedValue();
2128 * In the special case of shared permanent properties, the "own" property
2129 * can be found on a different object. In that case the returned property
2130 * might not be native, except: the shared permanent property optimization
2131 * is not applied if the objects have different classes (bug 320854), as
2132 * must be enforced by js_HasOwnProperty for the Shape cast below to be
2135 JS_ASSERT(obj->getClass() == obj2->getClass());
2137 const Shape *shape = reinterpret_cast<Shape *>(current);
2139 if (desc.isAccessorDescriptor()) {
2140 if (!shape->isAccessorDescriptor())
2145 if (!SameValue(cx, desc.getterValue(), shape->getterOrUndefined(), &same))
2153 if (!SameValue(cx, desc.setterValue(), shape->setterOrUndefined(), &same))
2160 * Determine the current value of the property once, if the current
2161 * value might actually need to be used or preserved later. NB: we
2162 * guard on whether the current property is a data descriptor to
2163 * avoid calling a getter; we won't need the value if it's not a
2166 if (shape->isDataDescriptor()) {
2168 * We must rule out a non-configurable js::PropertyOp-guarded
2169 * property becoming a writable unguarded data property, since
2170 * such a property can have its value changed to one the getter
2171 * and setter preclude.
2173 * A desc lacking writable but with value is a data descriptor
2174 * and we must reject it as if it had writable: true if current
2177 if (!shape->configurable() &&
2178 (!shape->hasDefaultGetter() || !shape->hasDefaultSetter()) &&
2179 desc.isDataDescriptor() &&
2180 (desc.hasWritable ? desc.writable() : shape->writable()))
2182 return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, desc.id, rval);
2185 if (!js_NativeGet(cx, obj, obj2, shape, JSGET_NO_METHOD_BARRIER, &v))
2189 if (desc.isDataDescriptor()) {
2190 if (!shape->isDataDescriptor())
2194 if (desc.hasValue) {
2195 if (!SameValue(cx, desc.value, v, &same))
2199 * Insist that a non-configurable js::PropertyOp data
2200 * property is frozen at exactly the last-got value.
2202 * Duplicate the first part of the big conjunction that
2203 * we tested above, rather than add a local bool flag.
2204 * Likewise, don't try to keep shape->writable() in a
2205 * flag we veto from true to false for non-configurable
2206 * PropertyOp-based data properties and test before the
2207 * SameValue check later on in order to re-use that "if
2208 * (!SameValue) Reject" logic.
2210 * This function is large and complex enough that it
2211 * seems best to repeat a small bit of code and return
2212 * Reject(...) ASAP, instead of being clever.
2214 if (!shape->configurable() &&
2215 (!shape->hasDefaultGetter() || !shape->hasDefaultSetter()))
2217 return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, desc.id, rval);
2222 if (desc.hasWritable && desc.writable() != shape->writable())
2225 /* The only fields in desc will be handled below. */
2226 JS_ASSERT(desc.isGenericDescriptor());
2230 if (desc.hasConfigurable && desc.configurable() != shape->configurable())
2232 if (desc.hasEnumerable && desc.enumerable() != shape->enumerable())
2235 /* The conditions imposed by step 5 or step 6 apply. */
2240 /* 8.12.9 step 7. */
2241 if (!shape->configurable()) {
2243 * Since [[Configurable]] defaults to false, we don't need to check
2244 * whether it was specified. We can't do likewise for [[Enumerable]]
2245 * because its putative value is used in a comparison -- a comparison
2246 * whose result must always be false per spec if the [[Enumerable]]
2247 * field is not present. Perfectly pellucid logic, eh?
2249 JS_ASSERT_IF(!desc.hasConfigurable, !desc.configurable());
2250 if (desc.configurable() ||
2251 (desc.hasEnumerable && desc.enumerable() != shape->enumerable())) {
2252 return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, desc.id, rval);
2256 bool callDelProperty = false;
2258 if (desc.isGenericDescriptor()) {
2259 /* 8.12.9 step 8, no validation required */
2260 } else if (desc.isDataDescriptor() != shape->isDataDescriptor()) {
2261 /* 8.12.9 step 9. */
2262 if (!shape->configurable())
2263 return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, desc.id, rval);
2264 } else if (desc.isDataDescriptor()) {
2265 /* 8.12.9 step 10. */
2266 JS_ASSERT(shape->isDataDescriptor());
2267 if (!shape->configurable() && !shape->writable()) {
2268 if (desc.hasWritable && desc.writable())
2269 return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, desc.id, rval);
2270 if (desc.hasValue) {
2272 if (!SameValue(cx, desc.value, v, &same))
2275 return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, desc.id, rval);
2279 callDelProperty = !shape->hasDefaultGetter() || !shape->hasDefaultSetter();
2281 /* 8.12.9 step 11. */
2282 JS_ASSERT(desc.isAccessorDescriptor() && shape->isAccessorDescriptor());
2283 if (!shape->configurable()) {
2286 if (!SameValue(cx, desc.setterValue(), shape->setterOrUndefined(), &same))
2289 return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, desc.id, rval);
2294 if (!SameValue(cx, desc.getterValue(), shape->getterOrUndefined(), &same))
2297 return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, desc.id, rval);
2302 /* 8.12.9 step 12. */
2305 StrictPropertyOp setter;
2306 if (desc.isGenericDescriptor()) {
2308 if (desc.hasConfigurable)
2309 changed |= JSPROP_PERMANENT;
2310 if (desc.hasEnumerable)
2311 changed |= JSPROP_ENUMERATE;
2313 attrs = (shape->attributes() & ~changed) | (desc.attrs & changed);
2314 if (shape->isMethod()) {
2315 JS_ASSERT(!(attrs & (JSPROP_GETTER | JSPROP_SETTER)));
2316 getter = PropertyStub;
2317 setter = StrictPropertyStub;
2319 getter = shape->getter();
2320 setter = shape->setter();
2322 } else if (desc.isDataDescriptor()) {
2323 uintN unchanged = 0;
2324 if (!desc.hasConfigurable)
2325 unchanged |= JSPROP_PERMANENT;
2326 if (!desc.hasEnumerable)
2327 unchanged |= JSPROP_ENUMERATE;
2328 if (!desc.hasWritable)
2329 unchanged |= JSPROP_READONLY;
2333 attrs = (desc.attrs & ~unchanged) | (shape->attributes() & unchanged);
2334 getter = PropertyStub;
2335 setter = StrictPropertyStub;
2337 JS_ASSERT(desc.isAccessorDescriptor());
2340 * Getters and setters are just like watchpoints from an access
2341 * control point of view.
2344 if (!CheckAccess(cx, obj2, desc.id, JSACC_WATCH, &dummy, &attrs))
2347 JS_ASSERT_IF(shape->isMethod(), !(attrs & (JSPROP_GETTER | JSPROP_SETTER)));
2349 /* 8.12.9 step 12. */
2351 if (desc.hasConfigurable)
2352 changed |= JSPROP_PERMANENT;
2353 if (desc.hasEnumerable)
2354 changed |= JSPROP_ENUMERATE;
2356 changed |= JSPROP_GETTER | JSPROP_SHARED;
2358 changed |= JSPROP_SETTER | JSPROP_SHARED;
2360 attrs = (desc.attrs & changed) | (shape->attributes() & ~changed);
2362 getter = desc.getter();
2364 getter = (shape->isMethod() || (shape->hasDefaultGetter() && !shape->hasGetterValue()))
2369 setter = desc.setter();
2371 setter = (shape->hasDefaultSetter() && !shape->hasSetterValue())
2372 ? StrictPropertyStub
2380 * Since "data" properties implemented using native C functions may rely on
2381 * side effects during setting, we must make them aware that they have been
2382 * "assigned"; deleting the property before redefining it does the trick.
2383 * See bug 539766, where we ran into problems when we redefined
2384 * arguments.length without making the property aware that its value had
2385 * been changed (which would have happened if we had deleted it before
2386 * redefining it or we had invoked its setter to change its value).
2388 if (callDelProperty) {
2389 Value dummy = UndefinedValue();
2390 if (!CallJSPropertyOp(cx, obj2->getClass()->delProperty, obj2, desc.id, &dummy))
2394 return js_DefineProperty(cx, obj, desc.id, &v, getter, setter, attrs);
2398 DefinePropertyOnArray(JSContext *cx, JSObject *obj, const PropDesc &desc,
2399 bool throwError, bool *rval)
2402 * We probably should optimize dense array property definitions where
2403 * the descriptor describes a traditional array property (enumerable,
2404 * configurable, writable, numeric index or length without altering its
2405 * attributes). Such definitions are probably unlikely, so we don't bother
2408 if (obj->isDenseArray() && !obj->makeDenseArraySlow(cx))
2411 jsuint oldLen = obj->getArrayLength();
2413 if (JSID_IS_ATOM(desc.id, cx->runtime->atomState.lengthAtom)) {
2415 * Our optimization of storage of the length property of arrays makes
2416 * it very difficult to properly implement defining the property. For
2417 * now simply throw an exception (NB: not merely Reject) on any attempt
2418 * to define the "length" property, rather than attempting to implement
2419 * some difficult-for-authors-to-grasp subset of that functionality.
2421 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CANT_DEFINE_ARRAY_LENGTH);
2426 if (js_IdIsIndex(desc.id, &index)) {
2428 // Disabled until we support defining "length":
2429 if (index >= oldLen && lengthPropertyNotWritable())
2430 return ThrowTypeError(cx, JSMSG_CANT_APPEND_TO_ARRAY);
2432 if (!DefinePropertyOnObject(cx, obj, desc, false, rval))
2435 return Reject(cx, obj, JSMSG_CANT_DEFINE_ARRAY_INDEX, throwError, rval);
2437 if (index >= oldLen) {
2438 JS_ASSERT(index != UINT32_MAX);
2439 obj->setArrayLength(index + 1);
2446 return DefinePropertyOnObject(cx, obj, desc, throwError, rval);
2450 DefineProperty(JSContext *cx, JSObject *obj, const PropDesc &desc, bool throwError,
2454 return DefinePropertyOnArray(cx, obj, desc, throwError, rval);
2456 if (obj->getOps()->lookupProperty) {
2458 return JSProxy::defineProperty(cx, obj, desc.id, desc.pd);
2459 return Reject(cx, obj, JSMSG_OBJECT_NOT_EXTENSIBLE, throwError, rval);
2462 return DefinePropertyOnObject(cx, obj, desc, throwError, rval);
2466 js_DefineOwnProperty(JSContext *cx, JSObject *obj, jsid id,
2467 const Value &descriptor, JSBool *bp)
2469 AutoPropDescArrayRooter descs(cx);
2470 PropDesc *desc = descs.append();
2471 if (!desc || !desc->initialize(cx, id, descriptor))
2475 if (!DefineProperty(cx, obj, *desc, true, &rval))
2481 /* ES5 15.2.3.6: Object.defineProperty(O, P, Attributes) */
2483 obj_defineProperty(JSContext* cx, uintN argc, Value* vp)
2485 /* 15.2.3.6 steps 1 and 5. */
2487 if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.defineProperty", &obj))
2489 vp->setObject(*obj);
2491 /* 15.2.3.6 step 2. */
2492 AutoIdRooter nameidr(cx);
2493 if (!ValueToId(cx, argc >= 2 ? vp[3] : UndefinedValue(), nameidr.addr()))
2496 /* 15.2.3.6 step 3. */
2497 const Value &descval = argc >= 3 ? vp[4] : UndefinedValue();
2499 /* 15.2.3.6 step 4 */
2501 return js_DefineOwnProperty(cx, obj, nameidr.id(), descval, &junk);
2505 DefineProperties(JSContext *cx, JSObject *obj, JSObject *props)
2507 AutoIdArray ida(cx, JS_Enumerate(cx, props));
2511 AutoPropDescArrayRooter descs(cx);
2512 size_t len = ida.length();
2513 for (size_t i = 0; i < len; i++) {
2515 PropDesc* desc = descs.append();
2516 AutoValueRooter tvr(cx);
2518 !JS_GetPropertyById(cx, props, id, tvr.jsval_addr()) ||
2519 !desc->initialize(cx, id, tvr.value())) {
2525 for (size_t i = 0; i < len; i++) {
2526 if (!DefineProperty(cx, obj, descs[i], true, &dummy))
2534 js_PopulateObject(JSContext *cx, JSObject *newborn, JSObject *props)
2536 return DefineProperties(cx, newborn, props);
2539 /* ES5 15.2.3.7: Object.defineProperties(O, Properties) */
2541 obj_defineProperties(JSContext* cx, uintN argc, Value* vp)
2543 /* 15.2.3.6 steps 1 and 5. */
2545 if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.defineProperties", &obj))
2547 vp->setObject(*obj);
2550 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_MORE_ARGS_NEEDED,
2551 "Object.defineProperties", "0", "s");
2555 JSObject* props = js_ValueToNonNullObject(cx, vp[3]);
2558 vp[3].setObject(*props);
2560 return DefineProperties(cx, obj, props);
2563 /* ES5 15.2.3.5: Object.create(O [, Properties]) */
2565 obj_create(JSContext *cx, uintN argc, Value *vp)
2568 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_MORE_ARGS_NEEDED,
2569 "Object.create", "0", "s");
2573 const Value &v = vp[2];
2574 if (!v.isObjectOrNull()) {
2575 char *bytes = DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, v, NULL);
2578 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_UNEXPECTED_TYPE,
2579 bytes, "not an object or null");
2585 * Use the callee's global as the parent of the new object to avoid dynamic
2586 * scoping (i.e., using the caller's global).
2588 JSObject *obj = NewNonFunction<WithProto::Given>(cx, &js_ObjectClass, v.toObjectOrNull(),
2589 vp->toObject().getGlobal());
2592 vp->setObject(*obj); /* Root and prepare for eventual return. */
2594 /* 15.2.3.5 step 4. */
2595 if (argc > 1 && !vp[3].isUndefined()) {
2596 if (vp[3].isPrimitive()) {
2597 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_NOT_NONNULL_OBJECT);
2601 JSObject *props = &vp[3].toObject();
2602 AutoIdArray ida(cx, JS_Enumerate(cx, props));
2606 AutoPropDescArrayRooter descs(cx);
2607 size_t len = ida.length();
2608 for (size_t i = 0; i < len; i++) {
2610 PropDesc *desc = descs.append();
2611 if (!desc || !JS_GetPropertyById(cx, props, id, Jsvalify(&vp[1])) ||
2612 !desc->initialize(cx, id, vp[1])) {
2618 for (size_t i = 0; i < len; i++) {
2619 if (!DefineProperty(cx, obj, descs[i], true, &dummy))
2624 /* 5. Return obj. */
2629 obj_getOwnPropertyNames(JSContext *cx, uintN argc, Value *vp)
2632 if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.getOwnPropertyNames", &obj))
2635 AutoIdVector keys(cx);
2636 if (!GetPropertyNames(cx, obj, JSITER_OWNONLY | JSITER_HIDDEN, &keys))
2639 AutoValueVector vals(cx);
2640 if (!vals.resize(keys.length()))
2643 for (size_t i = 0, len = keys.length(); i < len; i++) {
2645 if (JSID_IS_INT(id)) {
2646 JSString *str = js_ValueToString(cx, Int32Value(JSID_TO_INT(id)));
2649 vals[i].setString(str);
2650 } else if (JSID_IS_ATOM(id)) {
2651 vals[i].setString(JSID_TO_STRING(id));
2653 vals[i].setObject(*JSID_TO_OBJECT(id));
2657 JSObject *aobj = NewDenseCopiedArray(cx, vals.length(), vals.begin());
2661 vp->setObject(*aobj);
2666 obj_isExtensible(JSContext *cx, uintN argc, Value *vp)
2669 if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.isExtensible", &obj))
2672 vp->setBoolean(obj->isExtensible());
2677 obj_preventExtensions(JSContext *cx, uintN argc, Value *vp)
2680 if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.preventExtensions", &obj))
2683 vp->setObject(*obj);
2684 if (!obj->isExtensible())
2687 AutoIdVector props(cx);
2688 return obj->preventExtensions(cx, &props);
2692 JSObject::sealOrFreeze(JSContext *cx, ImmutabilityType it)
2694 assertSameCompartment(cx, this);
2695 JS_ASSERT(it == SEAL || it == FREEZE);
2697 AutoIdVector props(cx);
2698 if (isExtensible()) {
2699 if (!preventExtensions(cx, &props))
2702 if (!GetPropertyNames(cx, this, JSITER_HIDDEN | JSITER_OWNONLY, &props))
2706 /* preventExtensions must slowify dense arrays, so we can assign to holes without checks. */
2707 JS_ASSERT(!isDenseArray());
2709 for (size_t i = 0, len = props.length(); i < len; i++) {
2713 if (!getAttributes(cx, id, &attrs))
2716 /* Make all attributes permanent; if freezing, make data attributes read-only. */
2718 if (it == FREEZE && !(attrs & (JSPROP_GETTER | JSPROP_SETTER)))
2719 new_attrs = JSPROP_PERMANENT | JSPROP_READONLY;
2721 new_attrs = JSPROP_PERMANENT;
2723 /* If we already have the attributes we need, skip the setAttributes call. */
2724 if ((attrs | new_attrs) == attrs)
2728 if (!setAttributes(cx, id, &attrs))
2736 obj_freeze(JSContext *cx, uintN argc, Value *vp)
2739 if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.freeze", &obj))
2742 vp->setObject(*obj);
2744 return obj->freeze(cx);
2748 obj_isFrozen(JSContext *cx, uintN argc, Value *vp)
2751 if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.preventExtensions", &obj))
2754 vp->setBoolean(false);
2756 if (obj->isExtensible())
2757 return true; /* The JavaScript value returned is false. */
2759 AutoIdVector props(cx);
2760 if (!GetPropertyNames(cx, obj, JSITER_HIDDEN | JSITER_OWNONLY, &props))
2763 for (size_t i = 0, len = props.length(); i < len; i++) {
2767 if (!obj->getAttributes(cx, id, &attrs))
2770 /* The property must be non-configurable and either read-only or an accessor. */
2771 if (!(attrs & JSPROP_PERMANENT) ||
2772 !(attrs & (JSPROP_READONLY | JSPROP_GETTER | JSPROP_SETTER)))
2773 return true; /* The JavaScript value returned is false. */
2776 /* It really was sealed, so return true. */
2777 vp->setBoolean(true);
2782 obj_seal(JSContext *cx, uintN argc, Value *vp)
2785 if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.seal", &obj))
2788 vp->setObject(*obj);
2790 return obj->seal(cx);
2794 obj_isSealed(JSContext *cx, uintN argc, Value *vp)
2797 if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.isSealed", &obj))
2800 /* Assume not sealed until proven otherwise. */
2801 vp->setBoolean(false);
2803 if (obj->isExtensible())
2804 return true; /* The JavaScript value returned is false. */
2806 AutoIdVector props(cx);
2807 if (!GetPropertyNames(cx, obj, JSITER_HIDDEN | JSITER_OWNONLY, &props))
2810 for (size_t i = 0, len = props.length(); i < len; i++) {
2814 if (!obj->getAttributes(cx, id, &attrs))
2817 if (!(attrs & JSPROP_PERMANENT))
2818 return true; /* The JavaScript value returned is false. */
2821 /* It really was sealed, so return true. */
2822 vp->setBoolean(true);
2826 #if JS_HAS_OBJ_WATCHPOINT
2827 const char js_watch_str[] = "watch";
2828 const char js_unwatch_str[] = "unwatch";
2830 const char js_hasOwnProperty_str[] = "hasOwnProperty";
2831 const char js_isPrototypeOf_str[] = "isPrototypeOf";
2832 const char js_propertyIsEnumerable_str[] = "propertyIsEnumerable";
2834 static JSFunctionSpec object_methods[] = {
2836 JS_FN(js_toSource_str, obj_toSource, 0,0),
2838 JS_FN(js_toString_str, obj_toString, 0,0),
2839 JS_FN(js_toLocaleString_str, obj_toLocaleString, 0,0),
2840 JS_FN(js_valueOf_str, obj_valueOf, 0,0),
2841 #if JS_HAS_OBJ_WATCHPOINT
2842 JS_FN(js_watch_str, obj_watch, 2,0),
2843 JS_FN(js_unwatch_str, obj_unwatch, 1,0),
2845 JS_FN(js_hasOwnProperty_str, obj_hasOwnProperty, 1,0),
2846 JS_FN(js_isPrototypeOf_str, obj_isPrototypeOf, 1,0),
2847 JS_FN(js_propertyIsEnumerable_str, obj_propertyIsEnumerable, 1,0),
2848 #if OLD_GETTER_SETTER_METHODS
2849 JS_FN(js_defineGetter_str, js_obj_defineGetter, 2,0),
2850 JS_FN(js_defineSetter_str, js_obj_defineSetter, 2,0),
2851 JS_FN(js_lookupGetter_str, obj_lookupGetter, 1,0),
2852 JS_FN(js_lookupSetter_str, obj_lookupSetter, 1,0),
2857 static JSFunctionSpec object_static_methods[] = {
2858 JS_FN("getPrototypeOf", obj_getPrototypeOf, 1,0),
2859 JS_FN("getOwnPropertyDescriptor", obj_getOwnPropertyDescriptor,2,0),
2860 JS_FN("keys", obj_keys, 1,0),
2861 JS_FN("defineProperty", obj_defineProperty, 3,0),
2862 JS_FN("defineProperties", obj_defineProperties, 2,0),
2863 JS_FN("create", obj_create, 2,0),
2864 JS_FN("getOwnPropertyNames", obj_getOwnPropertyNames, 1,0),
2865 JS_FN("isExtensible", obj_isExtensible, 1,0),
2866 JS_FN("preventExtensions", obj_preventExtensions, 1,0),
2867 JS_FN("freeze", obj_freeze, 1,0),
2868 JS_FN("isFrozen", obj_isFrozen, 1,0),
2869 JS_FN("seal", obj_seal, 1,0),
2870 JS_FN("isSealed", obj_isSealed, 1,0),
2875 js_Object(JSContext *cx, uintN argc, Value *vp)
2879 /* Trigger logic below to construct a blank object. */
2882 /* If argv[0] is null or undefined, obj comes back null. */
2883 if (!js_ValueToObjectOrNull(cx, vp[2], &obj))
2887 /* Make an object whether this was called with 'new' or not. */
2888 JS_ASSERT(!argc || vp[2].isNull() || vp[2].isUndefined());
2889 gc::FinalizeKind kind = NewObjectGCKind(cx, &js_ObjectClass);
2890 obj = NewBuiltinClassInstance(cx, &js_ObjectClass, kind);
2894 vp->setObject(*obj);
2899 js_CreateThis(JSContext *cx, JSObject *callee)
2901 Class *clasp = callee->getClass();
2903 Class *newclasp = &js_ObjectClass;
2904 if (clasp == &js_FunctionClass) {
2905 JSFunction *fun = callee->getFunctionPrivate();
2906 if (fun->isNative() && fun->u.n.clasp)
2907 newclasp = fun->u.n.clasp;
2911 if (!callee->getProperty(cx, ATOM_TO_JSID(cx->runtime->atomState.classPrototypeAtom), &protov))
2914 JSObject *proto = protov.isObjectOrNull() ? protov.toObjectOrNull() : NULL;
2915 JSObject *parent = callee->getParent();
2916 gc::FinalizeKind kind = NewObjectGCKind(cx, newclasp);
2917 JSObject *obj = NewObject<WithProto::Class>(cx, newclasp, proto, parent, kind);
2919 obj->syncSpecialEquality();
2924 js_CreateThisForFunctionWithProto(JSContext *cx, JSObject *callee, JSObject *proto)
2926 gc::FinalizeKind kind = NewObjectGCKind(cx, &js_ObjectClass);
2927 return NewNonFunction<WithProto::Class>(cx, &js_ObjectClass, proto, callee->getParent(), kind);
2931 js_CreateThisForFunction(JSContext *cx, JSObject *callee)
2934 if (!callee->getProperty(cx,
2935 ATOM_TO_JSID(cx->runtime->atomState.classPrototypeAtom),
2939 JSObject *proto = protov.isObject() ? &protov.toObject() : NULL;
2940 return js_CreateThisForFunctionWithProto(cx, callee, proto);
2945 static JS_ALWAYS_INLINE JSObject*
2946 NewObjectWithClassProto(JSContext *cx, Class *clasp, JSObject *proto,
2947 /*gc::FinalizeKind*/ unsigned _kind)
2949 JS_ASSERT(clasp->isNative());
2950 gc::FinalizeKind kind = gc::FinalizeKind(_kind);
2952 JSObject* obj = js_NewGCObject(cx, kind);
2956 if (!obj->initSharingEmptyShape(cx, clasp, proto, proto->getParent(), NULL, kind))
2962 js_Object_tn(JSContext* cx, JSObject* proto)
2964 JS_ASSERT(!(js_ObjectClass.flags & JSCLASS_HAS_PRIVATE));
2965 return NewObjectWithClassProto(cx, &js_ObjectClass, proto, FINALIZE_OBJECT8);
2968 JS_DEFINE_TRCINFO_1(js_Object,
2969 (2, (extern, CONSTRUCTOR_RETRY, js_Object_tn, CONTEXT, CALLEE_PROTOTYPE, 0,
2970 nanojit::ACCSET_STORE_ANY)))
2973 js_InitializerObject(JSContext* cx, JSObject *proto, JSObject *baseobj)
2976 gc::FinalizeKind kind = GuessObjectGCKind(0, false);
2977 return NewObjectWithClassProto(cx, &js_ObjectClass, proto, kind);
2980 return CopyInitializerObject(cx, baseobj);
2983 JS_DEFINE_CALLINFO_3(extern, OBJECT, js_InitializerObject, CONTEXT, OBJECT, OBJECT,
2984 0, nanojit::ACCSET_STORE_ANY)
2987 js_String_tn(JSContext* cx, JSObject* proto, JSString* str)
2989 JS_ASSERT(JS_ON_TRACE(cx));
2990 JSObject *obj = NewObjectWithClassProto(cx, &js_StringClass, proto, FINALIZE_OBJECT2);
2993 obj->setPrimitiveThis(StringValue(str));
2996 JS_DEFINE_CALLINFO_3(extern, OBJECT, js_String_tn, CONTEXT, CALLEE_PROTOTYPE, STRING, 0,
2997 nanojit::ACCSET_STORE_ANY)
3000 js_CreateThisFromTrace(JSContext *cx, JSObject *ctor, uintN protoSlot)
3003 JS_ASSERT(ctor->isFunction());
3004 JS_ASSERT(ctor->getFunctionPrivate()->isInterpreted());
3005 jsid id = ATOM_TO_JSID(cx->runtime->atomState.classPrototypeAtom);
3006 const Shape *shape = ctor->nativeLookup(id);
3007 JS_ASSERT(shape->slot == protoSlot);
3008 JS_ASSERT(!shape->configurable());
3009 JS_ASSERT(!shape->isMethod());
3012 JSObject *parent = ctor->getParent();
3014 const Value &protov = ctor->getSlotRef(protoSlot);
3015 if (protov.isObject()) {
3016 proto = &protov.toObject();
3019 * GetInterpretedFunctionPrototype found that ctor.prototype is
3020 * primitive. Use Object.prototype for proto, per ES5 13.2.2 step 7.
3022 if (!js_GetClassPrototype(cx, parent, JSProto_Object, &proto))
3026 gc::FinalizeKind kind = NewObjectGCKind(cx, &js_ObjectClass);
3027 return NewNativeClassInstance(cx, &js_ObjectClass, proto, parent, kind);
3029 JS_DEFINE_CALLINFO_3(extern, CONSTRUCTOR_RETRY, js_CreateThisFromTrace, CONTEXT, OBJECT, UINTN, 0,
3030 nanojit::ACCSET_STORE_ANY)
3032 #else /* !JS_TRACER */
3034 # define js_Object_trcinfo NULL
3036 #endif /* !JS_TRACER */
3039 * Given pc pointing after a property accessing bytecode, return true if the
3040 * access is "object-detecting" in the sense used by web scripts, e.g., when
3041 * checking whether document.all is defined.
3043 JS_REQUIRES_STACK JSBool
3044 Detecting(JSContext *cx, jsbytecode *pc)
3051 script = cx->fp()->script();
3052 endpc = script->code + script->length;
3053 for (;; pc += js_CodeSpec[op].length) {
3054 JS_ASSERT_IF(!cx->fp()->hasImacropc(), script->code <= pc && pc < endpc);
3056 /* General case: a branch or equality op follows the access. */
3057 op = js_GetOpcode(cx, script, pc);
3058 if (js_CodeSpec[op].format & JOF_DETECTING)
3064 * Special case #1: handle (document.all == null). Don't sweat
3065 * about JS1.2's revision of the equality operators here.
3068 op = js_GetOpcode(cx, script, pc);
3069 return *pc == JSOP_EQ || *pc == JSOP_NE;
3076 * Special case #2: handle (document.all == undefined). Don't
3077 * worry about someone redefining undefined, which was added by
3078 * Edition 3, so is read/write for backward compatibility.
3080 GET_ATOM_FROM_BYTECODE(script, pc, 0, atom);
3081 if (atom == cx->runtime->atomState.typeAtoms[JSTYPE_VOID] &&
3082 (pc += js_CodeSpec[op].length) < endpc) {
3083 op = js_GetOpcode(cx, script, pc);
3084 return op == JSOP_EQ || op == JSOP_NE ||
3085 op == JSOP_STRICTEQ || op == JSOP_STRICTNE;
3091 * At this point, anything but an extended atom index prefix means
3092 * we're not detecting.
3094 if (!(js_CodeSpec[op].format & JOF_INDEXBASE))
3102 * Infer lookup flags from the currently executing bytecode. This does
3103 * not attempt to infer JSRESOLVE_WITH, because the current bytecode
3104 * does not indicate whether we are in a with statement. Return defaultFlags
3105 * if a currently executing bytecode cannot be determined.
3108 js_InferFlags(JSContext *cx, uintN defaultFlags)
3111 if (JS_ON_TRACE(cx))
3112 return JS_TRACE_MONITOR_ON_TRACE(cx)->bailExit->lookupFlags;
3115 JS_ASSERT_NOT_ON_TRACE(cx);
3118 const JSCodeSpec *cs;
3122 JSStackFrame *const fp = js_GetTopStackFrame(cx);
3123 if (!fp || !(pc = cx->regs->pc))
3124 return defaultFlags;
3125 cs = &js_CodeSpec[js_GetOpcode(cx, fp->script(), pc)];
3126 format = cs->format;
3127 if (JOF_MODE(format) != JOF_NAME)
3128 flags |= JSRESOLVE_QUALIFIED;
3129 if ((format & (JOF_SET | JOF_FOR)) || fp->isAssigning()) {
3130 flags |= JSRESOLVE_ASSIGNING;
3131 } else if (cs->length >= 0) {
3133 JSScript *script = cx->fp()->script();
3134 if (pc < script->code + script->length && Detecting(cx, pc))
3135 flags |= JSRESOLVE_DETECTING;
3137 if (format & JOF_DECLARING)
3138 flags |= JSRESOLVE_DECLARING;
3143 * ObjectOps and Class for with-statement stack objects.
3146 with_LookupProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
3149 /* Fixes bug 463997 */
3150 uintN flags = cx->resolveFlags;
3151 if (flags == JSRESOLVE_INFER)
3152 flags = js_InferFlags(cx, flags);
3153 flags |= JSRESOLVE_WITH;
3154 JSAutoResolveFlags rf(cx, flags);
3155 return obj->getProto()->lookupProperty(cx, id, objp, propp);
3159 with_GetProperty(JSContext *cx, JSObject *obj, JSObject *receiver, jsid id, Value *vp)
3161 return obj->getProto()->getProperty(cx, id, vp);
3165 with_SetProperty(JSContext *cx, JSObject *obj, jsid id, Value *vp, JSBool strict)
3167 return obj->getProto()->setProperty(cx, id, vp, strict);
3171 with_GetAttributes(JSContext *cx, JSObject *obj, jsid id, uintN *attrsp)
3173 return obj->getProto()->getAttributes(cx, id, attrsp);
3177 with_SetAttributes(JSContext *cx, JSObject *obj, jsid id, uintN *attrsp)
3179 return obj->getProto()->setAttributes(cx, id, attrsp);
3183 with_DeleteProperty(JSContext *cx, JSObject *obj, jsid id, Value *rval, JSBool strict)
3185 return obj->getProto()->deleteProperty(cx, id, rval, strict);
3189 with_Enumerate(JSContext *cx, JSObject *obj, JSIterateOp enum_op,
3190 Value *statep, jsid *idp)
3192 return obj->getProto()->enumerate(cx, enum_op, statep, idp);
3196 with_TypeOf(JSContext *cx, JSObject *obj)
3198 return JSTYPE_OBJECT;
3202 with_ThisObject(JSContext *cx, JSObject *obj)
3204 return obj->getWithThis();
3207 Class js_WithClass = {
3209 JSCLASS_HAS_PRIVATE | JSCLASS_HAS_RESERVED_SLOTS(2) | JSCLASS_IS_ANONYMOUS,
3210 PropertyStub, /* addProperty */
3211 PropertyStub, /* delProperty */
3212 PropertyStub, /* getProperty */
3213 StrictPropertyStub, /* setProperty */
3217 NULL, /* finalize */
3218 NULL, /* reserved */
3219 NULL, /* checkAccess */
3221 NULL, /* construct */
3222 NULL, /* xdrObject */
3223 NULL, /* hasInstance */
3227 with_LookupProperty,
3228 NULL, /* defineProperty */
3233 with_DeleteProperty,
3243 JS_REQUIRES_STACK JSObject *
3244 js_NewWithObject(JSContext *cx, JSObject *proto, JSObject *parent, jsint depth)
3248 obj = js_NewGCObject(cx, FINALIZE_OBJECT2);
3252 JSStackFrame *priv = js_FloatingFrameIfGenerator(cx, cx->fp());
3254 obj->init(cx, &js_WithClass, proto, parent, priv, false);
3255 obj->setMap(cx->compartment->emptyWithShape);
3256 OBJ_SET_BLOCK_DEPTH(cx, obj, depth);
3258 AutoObjectRooter tvr(cx, obj);
3259 JSObject *thisp = proto->thisObject(cx);
3263 assertSameCompartment(cx, obj, thisp);
3265 obj->setWithThis(thisp);
3270 js_NewBlockObject(JSContext *cx)
3273 * Null obj's proto slot so that Object.prototype.* does not pollute block
3274 * scopes and to give the block object its own scope.
3276 JSObject *blockObj = js_NewGCObject(cx, FINALIZE_OBJECT2);
3280 blockObj->init(cx, &js_BlockClass, NULL, NULL, NULL, false);
3281 blockObj->setMap(cx->compartment->emptyBlockShape);
3286 js_CloneBlockObject(JSContext *cx, JSObject *proto, JSStackFrame *fp)
3288 JS_ASSERT(proto->isStaticBlock());
3290 size_t count = OBJ_BLOCK_COUNT(cx, proto);
3291 gc::FinalizeKind kind = gc::GetGCObjectKind(count + 1);
3293 JSObject *clone = js_NewGCObject(cx, kind);
3297 JSStackFrame *priv = js_FloatingFrameIfGenerator(cx, fp);
3299 /* The caller sets parent on its own. */
3300 clone->init(cx, &js_BlockClass, proto, NULL, priv, false);
3302 clone->setMap(proto->map);
3303 if (!clone->ensureInstanceReservedSlots(cx, count + 1))
3306 clone->setSlot(JSSLOT_BLOCK_DEPTH, proto->getSlot(JSSLOT_BLOCK_DEPTH));
3308 JS_ASSERT(clone->isClonedBlock());
3312 JS_REQUIRES_STACK JSBool
3313 js_PutBlockObject(JSContext *cx, JSBool normalUnwind)
3315 JSStackFrame *const fp = cx->fp();
3316 JSObject *obj = &fp->scopeChain();
3317 JS_ASSERT(obj->isClonedBlock());
3318 JS_ASSERT(obj->getPrivate() == js_FloatingFrameIfGenerator(cx, cx->fp()));
3320 /* Block objects should have all reserved slots allocated early. */
3321 uintN count = OBJ_BLOCK_COUNT(cx, obj);
3322 JS_ASSERT(obj->numSlots() >= JSSLOT_BLOCK_DEPTH + 1 + count);
3324 /* The block and its locals must be on the current stack for GC safety. */
3325 uintN depth = OBJ_BLOCK_DEPTH(cx, obj);
3326 JS_ASSERT(depth <= size_t(cx->regs->sp - fp->base()));
3327 JS_ASSERT(count <= size_t(cx->regs->sp - fp->base() - depth));
3329 /* See comments in CheckDestructuring from jsparse.cpp. */
3330 JS_ASSERT(count >= 1);
3333 uintN slot = JSSLOT_BLOCK_FIRST_FREE_SLOT;
3334 depth += fp->numFixed();
3335 memcpy(obj->getSlots() + slot, fp->slots() + depth, count * sizeof(Value));
3338 /* We must clear the private slot even with errors. */
3339 obj->setPrivate(NULL);
3340 fp->setScopeChainNoCallObj(*obj->getParent());
3341 return normalUnwind;
3345 block_getProperty(JSContext *cx, JSObject *obj, jsid id, Value *vp)
3348 * Block objects are never exposed to script, and the engine handles them
3349 * with care. So unlike other getters, this one can assert (rather than
3350 * check) certain invariants about obj.
3352 JS_ASSERT(obj->isClonedBlock());
3353 uintN index = (uintN) JSID_TO_INT(id);
3354 JS_ASSERT(index < OBJ_BLOCK_COUNT(cx, obj));
3356 JSStackFrame *fp = (JSStackFrame *) obj->getPrivate();
3358 fp = js_LiveFrameIfGenerator(fp);
3359 index += fp->numFixed() + OBJ_BLOCK_DEPTH(cx, obj);
3360 JS_ASSERT(index < fp->numSlots());
3361 *vp = fp->slots()[index];
3365 /* Values are in slots immediately following the class-reserved ones. */
3366 JS_ASSERT(obj->getSlot(JSSLOT_FREE(&js_BlockClass) + index) == *vp);
3371 block_setProperty(JSContext *cx, JSObject *obj, jsid id, JSBool strict, Value *vp)
3373 JS_ASSERT(obj->isClonedBlock());
3374 uintN index = (uintN) JSID_TO_INT(id);
3375 JS_ASSERT(index < OBJ_BLOCK_COUNT(cx, obj));
3377 JSStackFrame *fp = (JSStackFrame *) obj->getPrivate();
3379 fp = js_LiveFrameIfGenerator(fp);
3380 index += fp->numFixed() + OBJ_BLOCK_DEPTH(cx, obj);
3381 JS_ASSERT(index < fp->numSlots());
3382 fp->slots()[index] = *vp;
3387 * The value in *vp will be written back to the slot in obj that was
3388 * allocated when this let binding was defined.
3394 JSObject::defineBlockVariable(JSContext *cx, jsid id, intN index)
3396 JS_ASSERT(isStaticBlock());
3398 /* Use JSPROP_ENUMERATE to aid the disassembler. */
3399 uint32 slot = JSSLOT_FREE(&js_BlockClass) + index;
3400 const Shape *shape = addProperty(cx, id,
3401 block_getProperty, block_setProperty,
3402 slot, JSPROP_ENUMERATE | JSPROP_PERMANENT,
3403 Shape::HAS_SHORTID, index);
3406 if (slot >= numSlots() && !growSlots(cx, slot + 1))
3412 GetObjectSize(JSObject *obj)
3414 return (obj->isFunction() && !obj->getPrivate())
3415 ? sizeof(JSFunction)
3416 : sizeof(JSObject) + sizeof(js::Value) * obj->numFixedSlots();
3420 JSObject::copyPropertiesFrom(JSContext *cx, JSObject *obj)
3422 // If we're not native, then we cannot copy properties.
3423 JS_ASSERT(isNative() == obj->isNative());
3427 AutoShapeVector shapes(cx);
3428 for (Shape::Range r(obj->lastProperty()); !r.empty(); r.popFront()) {
3429 if (!shapes.append(&r.front()))
3433 size_t n = shapes.length();
3435 const Shape *shape = shapes[--n];
3436 uintN attrs = shape->attributes();
3437 PropertyOp getter = shape->getter();
3438 if ((attrs & JSPROP_GETTER) && !cx->compartment->wrap(cx, &getter))
3440 StrictPropertyOp setter = shape->setter();
3441 if ((attrs & JSPROP_SETTER) && !cx->compartment->wrap(cx, &setter))
3443 Value v = shape->hasSlot() ? obj->getSlot(shape->slot) : UndefinedValue();
3444 if (!cx->compartment->wrap(cx, &v))
3446 if (!defineProperty(cx, shape->id, v, getter, setter, attrs))
3453 CopySlots(JSContext *cx, JSObject *from, JSObject *to)
3455 JS_ASSERT(!from->isNative() && !to->isNative());
3456 size_t nslots = from->numSlots();
3457 if (to->ensureSlots(cx, nslots))
3461 if (to->isWrapper() &&
3462 (JSWrapper::wrapperHandler(to)->flags() & JSWrapper::CROSS_COMPARTMENT)) {
3463 to->slots[0] = from->slots[0];
3464 to->slots[1] = from->slots[1];
3468 for (; n < nslots; ++n) {
3469 Value v = from->slots[n];
3470 if (!cx->compartment->wrap(cx, &v))
3478 JSObject::clone(JSContext *cx, JSObject *proto, JSObject *parent)
3481 * We can only clone native objects and proxies. Dense arrays are slowified if
3482 * we try to clone them.
3485 if (isDenseArray()) {
3486 if (!makeDenseArraySlow(cx))
3488 } else if (!isProxy()) {
3489 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
3490 JSMSG_CANT_CLONE_OBJECT);
3494 JSObject *clone = NewObject<WithProto::Given>(cx, getClass(),
3496 gc::FinalizeKind(finalizeKind()));
3500 if (clone->isFunction() && (compartment() != clone->compartment())) {
3501 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
3502 JSMSG_CANT_CLONE_OBJECT);
3506 if (getClass()->flags & JSCLASS_HAS_PRIVATE)
3507 clone->setPrivate(getPrivate());
3509 JS_ASSERT(isProxy());
3510 if (!CopySlots(cx, this, clone))
3517 TradeGuts(JSObject *a, JSObject *b)
3519 JS_ASSERT(a->compartment() == b->compartment());
3520 JS_ASSERT(a->isFunction() == b->isFunction());
3523 * Regexp guts are more complicated -- we would need to migrate the
3524 * refcounted JIT code blob for them across compartments instead of just
3527 JS_ASSERT(!a->isRegExp() && !b->isRegExp());
3529 bool aInline = !a->hasSlotsArray();
3530 bool bInline = !b->hasSlotsArray();
3532 /* Trade the guts of the objects. */
3533 const size_t size = GetObjectSize(a);
3534 if (size == GetObjectSize(b)) {
3536 * If the objects are the same size, then we make no assumptions about
3537 * whether they have dynamically allocated slots and instead just copy
3538 * them over wholesale.
3540 char tmp[tl::Max<sizeof(JSFunction), sizeof(JSObject_Slots16)>::result];
3541 JS_ASSERT(size <= sizeof(tmp));
3543 memcpy(tmp, a, size);
3545 memcpy(b, tmp, size);
3547 /* Fixup pointers for inline slots on the objects. */
3549 b->slots = b->fixedSlots();
3551 a->slots = a->fixedSlots();
3554 * If the objects are of differing sizes, then we only copy over the
3555 * JSObject portion (things like class, etc.) and leave it to
3556 * JSObject::clone to copy over the dynamic slots for us.
3558 if (a->isFunction()) {
3560 memcpy(&tmp, a, sizeof tmp);
3561 memcpy(a, b, sizeof tmp);
3562 memcpy(b, &tmp, sizeof tmp);
3565 memcpy(&tmp, a, sizeof tmp);
3566 memcpy(a, b, sizeof tmp);
3567 memcpy(b, &tmp, sizeof tmp);
3570 JS_ASSERT(!aInline);
3571 JS_ASSERT(!bInline);
3576 * Use this method with extreme caution. It trades the guts of two objects and updates
3577 * scope ownership. This operation is not thread-safe, just as fast array to slow array
3578 * transitions are inherently not thread-safe. Don't perform a swap operation on objects
3579 * shared across threads or, or bad things will happen. You have been warned.
3582 JSObject::swap(JSContext *cx, JSObject *other)
3585 * If we are swapping objects with a different number of builtin slots, force
3586 * both to not use their inline slots.
3588 if (GetObjectSize(this) != GetObjectSize(other)) {
3589 if (!hasSlotsArray()) {
3590 if (!allocSlots(cx, numSlots()))
3593 if (!other->hasSlotsArray()) {
3594 if (!other->allocSlots(cx, other->numSlots()))
3599 if (this->compartment() == other->compartment()) {
3600 TradeGuts(this, other);
3604 JSObject *thisClone;
3605 JSObject *otherClone;
3607 AutoCompartment ac(cx, other);
3610 thisClone = this->clone(cx, other->getProto(), other->getParent());
3611 if (!thisClone || !thisClone->copyPropertiesFrom(cx, this))
3615 AutoCompartment ac(cx, this);
3618 otherClone = other->clone(cx, other->getProto(), other->getParent());
3619 if (!otherClone || !otherClone->copyPropertiesFrom(cx, other))
3622 TradeGuts(this, otherClone);
3623 TradeGuts(other, thisClone);
3630 #define NO_PARENT_INDEX ((uint32)-1)
3633 FindObjectIndex(JSObjectArray *array, JSObject *obj)
3641 if (array->vector[--i] == obj)
3646 return NO_PARENT_INDEX;
3650 js_XDRBlockObject(JSXDRState *xdr, JSObject **objp)
3654 JSObject *obj, *parent;
3656 uint32 depthAndCount;
3661 obj = NULL; /* quell GCC overwarning */
3664 if (xdr->mode == JSXDR_ENCODE) {
3666 parent = obj->getParent();
3667 parentId = JSScript::isValidOffset(xdr->script->objectsOffset)
3668 ? FindObjectIndex(xdr->script->objects(), parent)
3670 depth = (uint16)OBJ_BLOCK_DEPTH(cx, obj);
3671 count = (uint16)OBJ_BLOCK_COUNT(cx, obj);
3672 depthAndCount = (uint32)(depth << 16) | count;
3674 #ifdef __GNUC__ /* suppress bogus gcc warnings */
3678 /* First, XDR the parent atomid. */
3679 if (!JS_XDRUint32(xdr, &parentId))
3682 if (xdr->mode == JSXDR_DECODE) {
3683 obj = js_NewBlockObject(cx);
3689 * If there's a parent id, then get the parent out of our script's
3690 * object array. We know that we XDR block object in outer-to-inner
3691 * order, which means that getting the parent now will work.
3693 if (parentId == NO_PARENT_INDEX)
3696 parent = xdr->script->getObject(parentId);
3697 obj->setParent(parent);
3700 AutoObjectRooter tvr(cx, obj);
3702 if (!JS_XDRUint32(xdr, &depthAndCount))
3705 if (xdr->mode == JSXDR_DECODE) {
3706 depth = (uint16)(depthAndCount >> 16);
3707 count = (uint16)depthAndCount;
3708 obj->setSlot(JSSLOT_BLOCK_DEPTH, Value(Int32Value(depth)));
3711 * XDR the block object's properties. We know that there are 'count'
3712 * properties to XDR, stored as id/shortid pairs.
3714 for (uintN i = 0; i < count; i++) {
3718 /* XDR the real id, then the shortid. */
3719 if (!js_XDRAtom(xdr, &atom) || !JS_XDRUint16(xdr, &shortid))
3722 if (!obj->defineBlockVariable(cx, ATOM_TO_JSID(atom), shortid))
3726 AutoShapeVector shapes(cx);
3727 shapes.growBy(count);
3729 for (Shape::Range r(obj->lastProperty()); !r.empty(); r.popFront()) {
3731 shapes[shape->shortid] = shape;
3735 * XDR the block object's properties. We know that there are 'count'
3736 * properties to XDR, stored as id/shortid pairs.
3738 for (uintN i = 0; i < count; i++) {
3740 JS_ASSERT(shape->getter() == block_getProperty);
3742 jsid propid = shape->id;
3743 JS_ASSERT(JSID_IS_ATOM(propid));
3744 JSAtom *atom = JSID_TO_ATOM(propid);
3746 uint16 shortid = uint16(shape->shortid);
3747 JS_ASSERT(shortid == i);
3749 /* XDR the real id, then the shortid. */
3750 if (!js_XDRAtom(xdr, &atom) || !JS_XDRUint16(xdr, &shortid))
3759 Class js_BlockClass = {
3761 JSCLASS_HAS_PRIVATE | JSCLASS_HAS_RESERVED_SLOTS(1) | JSCLASS_IS_ANONYMOUS,
3762 PropertyStub, /* addProperty */
3763 PropertyStub, /* delProperty */
3764 PropertyStub, /* getProperty */
3765 StrictPropertyStub, /* setProperty */
3772 js_InitObjectClass(JSContext *cx, JSObject *obj)
3774 JSObject *proto = js_InitClass(cx, obj, NULL, &js_ObjectClass, js_Object, 1,
3775 object_props, object_methods, NULL, object_static_methods);
3779 /* ECMA (15.1.2.1) says 'eval' is a property of the global object. */
3780 jsid id = ATOM_TO_JSID(cx->runtime->atomState.evalAtom);
3781 if (!js_DefineFunction(cx, obj, id, eval, 1, JSFUN_STUB_GSOPS))
3788 DefineStandardSlot(JSContext *cx, JSObject *obj, JSProtoKey key, JSAtom *atom,
3789 const Value &v, uint32 attrs, bool &named)
3791 jsid id = ATOM_TO_JSID(atom);
3793 if (key != JSProto_Null) {
3795 * Initializing an actual standard class on a global object. If the
3796 * property is not yet present, force it into a new one bound to a
3797 * reserved slot. Otherwise, go through the normal property path.
3799 JS_ASSERT(obj->isGlobal());
3800 JS_ASSERT(obj->isNative());
3802 if (!obj->ensureClassReservedSlots(cx))
3805 const Shape *shape = obj->nativeLookup(id);
3807 uint32 slot = 2 * JSProto_LIMIT + key;
3808 if (!js_SetReservedSlot(cx, obj, slot, v))
3810 if (!obj->addProperty(cx, id, PropertyStub, StrictPropertyStub, slot, attrs, 0, 0))
3818 named = obj->defineProperty(cx, id, v, PropertyStub, StrictPropertyStub, attrs);
3825 DefineConstructorAndPrototype(JSContext *cx, JSObject *obj, JSProtoKey key, JSAtom *atom,
3826 JSObject *protoProto, Class *clasp,
3827 Native constructor, uintN nargs,
3828 JSPropertySpec *ps, JSFunctionSpec *fs,
3829 JSPropertySpec *static_ps, JSFunctionSpec *static_fs)
3832 * Create a prototype object for this class.
3834 * FIXME: lazy standard (built-in) class initialization and even older
3835 * eager boostrapping code rely on all of these properties:
3837 * 1. NewObject attempting to compute a default prototype object when
3838 * passed null for proto; and
3840 * 2. NewObject tolerating no default prototype (null proto slot value)
3841 * due to this js_InitClass call coming from js_InitFunctionClass on an
3842 * otherwise-uninitialized global.
3844 * 3. NewObject allocating a JSFunction-sized GC-thing when clasp is
3845 * &js_FunctionClass, not a JSObject-sized (smaller) GC-thing.
3847 * The JS_NewObjectForGivenProto and JS_NewObject APIs also allow clasp to
3848 * be &js_FunctionClass (we could break compatibility easily). But fixing
3849 * (3) is not enough without addressing the bootstrapping dependency on (1)
3852 JSObject *proto = NewObject<WithProto::Class>(cx, clasp, protoProto, obj);
3856 proto->syncSpecialEquality();
3858 /* After this point, control must exit via label bad or out. */
3859 AutoObjectRooter tvr(cx, proto);
3865 * Lacking a constructor, name the prototype (e.g., Math) unless this
3866 * class (a) is anonymous, i.e. for internal use only; (b) the class
3867 * of obj (the global object) is has a reserved slot indexed by key;
3868 * and (c) key is not the null key.
3870 if (!(clasp->flags & JSCLASS_IS_ANONYMOUS) || !obj->isGlobal() || key == JSProto_Null) {
3871 uint32 attrs = (clasp->flags & JSCLASS_IS_ANONYMOUS)
3872 ? JSPROP_READONLY | JSPROP_PERMANENT
3874 if (!DefineStandardSlot(cx, obj, key, atom, ObjectValue(*proto), attrs, named))
3880 JSFunction *fun = js_NewFunction(cx, NULL, constructor, nargs, JSFUN_CONSTRUCTOR, obj, atom);
3884 AutoValueRooter tvr2(cx, ObjectValue(*fun));
3885 if (!DefineStandardSlot(cx, obj, key, atom, tvr2.value(), 0, named))
3889 * Remember the class this function is a constructor for so that
3890 * we know to create an object of this class when we call the
3893 FUN_CLASP(fun) = clasp;
3896 * Optionally construct the prototype object, before the class has
3897 * been fully initialized. Allow the ctor to replace proto with a
3898 * different object, as is done for operator new -- and as at least
3899 * XML support requires.
3901 ctor = FUN_OBJECT(fun);
3902 if (clasp->flags & JSCLASS_CONSTRUCT_PROTOTYPE) {
3904 if (!InvokeConstructorWithGivenThis(cx, proto, ObjectOrNullValue(ctor),
3908 if (rval.isObject() && &rval.toObject() != proto)
3909 proto = &rval.toObject();
3912 /* Connect constructor and prototype by named properties. */
3913 if (!js_SetClassPrototype(cx, ctor, proto,
3914 JSPROP_READONLY | JSPROP_PERMANENT)) {
3918 /* Bootstrap Function.prototype (see also JS_InitStandardClasses). */
3919 if (ctor->getClass() == clasp)
3920 ctor->setProto(proto);
3923 /* Add properties and methods to the prototype and the constructor. */
3924 if ((ps && !JS_DefineProperties(cx, proto, ps)) ||
3925 (fs && !JS_DefineFunctions(cx, proto, fs)) ||
3926 (static_ps && !JS_DefineProperties(cx, ctor, static_ps)) ||
3927 (static_fs && !JS_DefineFunctions(cx, ctor, static_fs))) {
3932 * Pre-brand the prototype and constructor if they have built-in methods.
3933 * This avoids extra shape guard branch exits in the tracejitted code.
3937 if (ctor != proto && static_fs)
3941 * Make sure proto's emptyShape is available to be shared by objects of
3942 * this class. JSObject::emptyShape is a one-slot cache. If we omit this,
3943 * some other class could snap it up. (The risk is particularly great for
3944 * Object.prototype.)
3946 * All callers of JSObject::initSharingEmptyShape depend on this.
3948 * FIXME: bug 592296 -- js_InitArrayClass should pass &js_SlowArrayClass
3949 * and make the Array.prototype slow from the start.
3951 JS_ASSERT_IF(proto->clasp != clasp,
3952 clasp == &js_ArrayClass && proto->clasp == &js_SlowArrayClass);
3953 if (!proto->getEmptyShape(cx, proto->clasp, FINALIZE_OBJECT0))
3956 if (clasp->flags & (JSCLASS_FREEZE_PROTO|JSCLASS_FREEZE_CTOR)) {
3957 JS_ASSERT_IF(ctor == proto, !(clasp->flags & JSCLASS_FREEZE_CTOR));
3958 if (proto && (clasp->flags & JSCLASS_FREEZE_PROTO) && !proto->freeze(cx))
3960 if (ctor && (clasp->flags & JSCLASS_FREEZE_CTOR) && !ctor->freeze(cx))
3964 /* If this is a standard class, cache its prototype. */
3965 if (key != JSProto_Null && !js_SetClassObject(cx, obj, key, ctor, proto))
3973 obj->deleteProperty(cx, ATOM_TO_JSID(atom), &rval, false);
3981 js_InitClass(JSContext *cx, JSObject *obj, JSObject *protoProto,
3982 Class *clasp, Native constructor, uintN nargs,
3983 JSPropertySpec *ps, JSFunctionSpec *fs,
3984 JSPropertySpec *static_ps, JSFunctionSpec *static_fs)
3986 JSAtom *atom = js_Atomize(cx, clasp->name, strlen(clasp->name), 0);
3991 * All instances of the class will inherit properties from the prototype
3992 * object we are about to create (in DefineConstructorAndPrototype), which
3993 * in turn will inherit from protoProto.
3995 * When initializing a standard class (other than Object), if protoProto is
3996 * null, default to the Object prototype object. The engine's internal uses
3997 * of js_InitClass depend on this nicety. Note that in
3998 * js_InitFunctionAndObjectClasses, we specially hack the resolving table
3999 * and then depend on js_GetClassPrototype here leaving protoProto NULL and
4002 JSProtoKey key = JSCLASS_CACHED_PROTO_KEY(clasp);
4003 if (key != JSProto_Null &&
4005 !js_GetClassPrototype(cx, obj, JSProto_Object, &protoProto)) {
4009 return DefineConstructorAndPrototype(cx, obj, key, atom, protoProto, clasp, constructor, nargs,
4010 ps, fs, static_ps, static_fs);
4014 JSObject::allocSlots(JSContext *cx, size_t newcap)
4016 uint32 oldcap = numSlots();
4018 JS_ASSERT(newcap >= oldcap && !hasSlotsArray());
4020 if (newcap > NSLOTS_LIMIT) {
4021 if (!JS_ON_TRACE(cx))
4022 js_ReportAllocationOverflow(cx);
4026 Value *tmpslots = (Value*) cx->malloc(newcap * sizeof(Value));
4028 return false; /* Leave slots at inline buffer. */
4032 /* Copy over anything from the inline buffer. */
4033 memcpy(slots, fixedSlots(), oldcap * sizeof(Value));
4034 ClearValueRange(slots + oldcap, newcap - oldcap, isDenseArray());
4039 JSObject::growSlots(JSContext *cx, size_t newcap)
4042 * When an object with CAPACITY_DOUBLING_MAX or fewer slots needs to
4043 * grow, double its capacity, to add N elements in amortized O(N) time.
4045 * Above this limit, grow by 12.5% each time. Speed is still amortized
4046 * O(N), with a higher constant factor, and we waste less space.
4048 static const size_t CAPACITY_DOUBLING_MAX = 1024 * 1024;
4049 static const size_t CAPACITY_CHUNK = CAPACITY_DOUBLING_MAX / sizeof(Value);
4051 uint32 oldcap = numSlots();
4052 JS_ASSERT(oldcap < newcap);
4054 uint32 nextsize = (oldcap <= CAPACITY_DOUBLING_MAX)
4056 : oldcap + (oldcap >> 3);
4058 uint32 actualCapacity = JS_MAX(newcap, nextsize);
4059 if (actualCapacity >= CAPACITY_CHUNK)
4060 actualCapacity = JS_ROUNDUP(actualCapacity, CAPACITY_CHUNK);
4061 else if (actualCapacity < SLOT_CAPACITY_MIN)
4062 actualCapacity = SLOT_CAPACITY_MIN;
4064 /* Don't let nslots get close to wrapping around uint32. */
4065 if (actualCapacity >= NSLOTS_LIMIT) {
4066 JS_ReportOutOfMemory(cx);
4070 /* If nothing was allocated yet, treat it as initial allocation. */
4071 if (!hasSlotsArray())
4072 return allocSlots(cx, actualCapacity);
4074 Value *tmpslots = (Value*) cx->realloc(slots, oldcap * sizeof(Value), actualCapacity * sizeof(Value));
4076 return false; /* Leave dslots as its old size. */
4078 capacity = actualCapacity;
4080 /* Initialize the additional slots we added. */
4081 ClearValueRange(slots + oldcap, actualCapacity - oldcap, isDenseArray());
4086 JSObject::shrinkSlots(JSContext *cx, size_t newcap)
4088 uint32 oldcap = numSlots();
4089 JS_ASSERT(newcap <= oldcap);
4090 JS_ASSERT(newcap >= slotSpan());
4092 if (oldcap <= SLOT_CAPACITY_MIN || !hasSlotsArray()) {
4093 /* We won't shrink the slots any more. Clear excess holes. */
4094 ClearValueRange(slots + newcap, oldcap - newcap, isDenseArray());
4098 uint32 fill = newcap;
4099 if (newcap < SLOT_CAPACITY_MIN)
4100 newcap = SLOT_CAPACITY_MIN;
4101 if (newcap < numFixedSlots())
4102 newcap = numFixedSlots();
4104 Value *tmpslots = (Value*) cx->realloc(slots, newcap * sizeof(Value));
4106 return; /* Leave slots at its old size. */
4110 if (fill < newcap) {
4111 /* Clear any excess holes if we tried to shrink below SLOT_CAPACITY_MIN. */
4112 ClearValueRange(slots + fill, newcap - fill, isDenseArray());
4117 JSObject::ensureInstanceReservedSlots(JSContext *cx, size_t nreserved)
4119 JS_ASSERT_IF(isNative(),
4120 isBlock() || isCall() || (isFunction() && isBoundFunction()));
4122 uintN nslots = JSSLOT_FREE(clasp) + nreserved;
4123 return nslots <= numSlots() || allocSlots(cx, nslots);
4127 js_InitNullClass(JSContext *cx, JSObject *obj)
4133 #define JS_PROTO(name,code,init) extern JSObject *init(JSContext *, JSObject *);
4134 #include "jsproto.tbl"
4137 static JSObjectOp lazy_prototype_init[JSProto_LIMIT] = {
4138 #define JS_PROTO(name,code,init) init,
4139 #include "jsproto.tbl"
4146 SetProto(JSContext *cx, JSObject *obj, JSObject *proto, bool checkForCycles)
4148 JS_ASSERT_IF(!checkForCycles, obj != proto);
4149 JS_ASSERT(obj->isExtensible());
4151 if (obj->isNative()) {
4152 if (!obj->ensureClassReservedSlots(cx))
4157 * Regenerate property cache shape ids for all of the scopes along the
4158 * old prototype chain to invalidate their property cache entries, in
4159 * case any entries were filled by looking up through obj.
4161 JSObject *oldproto = obj;
4162 while (oldproto && oldproto->isNative()) {
4163 oldproto->protoShapeChange(cx);
4164 oldproto = oldproto->getProto();
4167 if (!proto || !checkForCycles) {
4168 obj->setProto(proto);
4169 } else if (!SetProtoCheckingForCycles(cx, obj, proto)) {
4170 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CYCLIC_VALUE, js_proto_str);
4179 js_GetClassObject(JSContext *cx, JSObject *obj, JSProtoKey key,
4183 JSResolvingKey rkey;
4184 JSResolvingEntry *rentry;
4189 obj = obj->getGlobal();
4190 if (!obj->isGlobal()) {
4195 v = obj->getReservedSlot(key);
4197 *objp = &v.toObject();
4202 rkey.id = ATOM_TO_JSID(cx->runtime->atomState.classAtoms[key]);
4203 if (!js_StartResolving(cx, &rkey, JSRESFLAG_LOOKUP, &rentry))
4206 /* Already caching key in obj -- suppress recursion. */
4210 generation = cx->resolvingTable->generation;
4214 init = lazy_prototype_init[key];
4216 if (!init(cx, obj)) {
4219 v = obj->getReservedSlot(key);
4221 cobj = &v.toObject();
4225 js_StopResolving(cx, &rkey, JSRESFLAG_LOOKUP, rentry, generation);
4231 js_SetClassObject(JSContext *cx, JSObject *obj, JSProtoKey key, JSObject *cobj, JSObject *proto)
4233 JS_ASSERT(!obj->getParent());
4234 if (!obj->isGlobal())
4237 return js_SetReservedSlot(cx, obj, key, ObjectOrNullValue(cobj)) &&
4238 js_SetReservedSlot(cx, obj, JSProto_LIMIT + key, ObjectOrNullValue(proto));
4242 js_FindClassObject(JSContext *cx, JSObject *start, JSProtoKey protoKey,
4243 Value *vp, Class *clasp)
4246 JSObject *obj, *cobj, *pobj;
4252 * Find the global object. Use cx->fp() directly to avoid falling off
4253 * trace; all JIT-elided stack frames have the same global object as
4256 VOUCH_DOES_NOT_REQUIRE_STACK();
4257 if (!start && (fp = cx->maybefp()) != NULL)
4258 start = &fp->scopeChain();
4261 /* Find the topmost object in the scope chain. */
4264 start = obj->getParent();
4267 obj = cx->globalObject;
4274 OBJ_TO_INNER_OBJECT(cx, obj);
4278 if (protoKey != JSProto_Null) {
4279 JS_ASSERT(JSProto_Null < protoKey);
4280 JS_ASSERT(protoKey < JSProto_LIMIT);
4281 if (!js_GetClassObject(cx, obj, protoKey, &cobj))
4284 vp->setObject(*cobj);
4287 id = ATOM_TO_JSID(cx->runtime->atomState.classAtoms[protoKey]);
4289 JSAtom *atom = js_Atomize(cx, clasp->name, strlen(clasp->name), 0);
4292 id = ATOM_TO_JSID(atom);
4295 JS_ASSERT(obj->isNative());
4296 if (js_LookupPropertyWithFlags(cx, obj, id, JSRESOLVE_CLASSNAME,
4297 &pobj, &prop) < 0) {
4300 Value v = UndefinedValue();
4301 if (prop && pobj->isNative()) {
4302 shape = (Shape *) prop;
4303 if (pobj->containsSlot(shape->slot)) {
4304 v = pobj->nativeGetSlot(shape->slot);
4305 if (v.isPrimitive())
4314 js_ConstructObject(JSContext *cx, Class *clasp, JSObject *proto, JSObject *parent,
4315 uintN argc, Value *argv)
4317 AutoArrayRooter argtvr(cx, argc, argv);
4319 JSProtoKey protoKey = GetClassProtoKey(clasp);
4321 /* Protect constructor in case a crazy getter for .prototype uproots it. */
4322 AutoValueRooter tvr(cx);
4323 if (!js_FindClassObject(cx, parent, protoKey, tvr.addr(), clasp))
4326 const Value &cval = tvr.value();
4327 if (tvr.value().isPrimitive()) {
4328 js_ReportIsNotFunction(cx, tvr.addr(), JSV2F_CONSTRUCT | JSV2F_SEARCH_STACK);
4333 * If proto is NULL, set it to Constructor.prototype, just like JSOP_NEW
4334 * does, likewise for the new object's parent.
4336 JSObject *ctor = &cval.toObject();
4338 parent = ctor->getParent();
4341 if (!ctor->getProperty(cx, ATOM_TO_JSID(cx->runtime->atomState.classPrototypeAtom),
4345 if (rval.isObjectOrNull())
4346 proto = rval.toObjectOrNull();
4349 JSObject *obj = NewObject<WithProto::Class>(cx, clasp, proto, parent);
4353 obj->syncSpecialEquality();
4356 if (!InvokeConstructorWithGivenThis(cx, obj, cval, argc, argv, &rval))
4359 if (rval.isPrimitive())
4363 * If the instance's class differs from what was requested, throw a type
4364 * error. If the given class has both the JSCLASS_HAS_PRIVATE and the
4365 * JSCLASS_CONSTRUCT_PROTOTYPE flags, and the instance does not have its
4366 * private data set at this point, then the constructor was replaced and
4367 * we should throw a type error.
4369 obj = &rval.toObject();
4370 if (obj->getClass() != clasp ||
4371 (!(~clasp->flags & (JSCLASS_HAS_PRIVATE |
4372 JSCLASS_CONSTRUCT_PROTOTYPE)) &&
4373 !obj->getPrivate())) {
4374 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
4375 JSMSG_WRONG_CONSTRUCTOR, clasp->name);
4382 JSObject::allocSlot(JSContext *cx, uint32 *slotp)
4384 uint32 slot = slotSpan();
4385 JS_ASSERT(slot >= JSSLOT_FREE(clasp));
4388 * If this object is in dictionary mode and it has a property table, try to
4389 * pull a free slot from the property table's slot-number freelist.
4391 if (inDictionaryMode() && lastProp->hasTable()) {
4392 uint32 &last = lastProp->getTable()->freelist;
4393 if (last != SHAPE_INVALID_SLOT) {
4395 JS_ASSERT(last < slot);
4396 uint32 next = getSlot(last).toPrivateUint32();
4397 JS_ASSERT_IF(next != SHAPE_INVALID_SLOT, next < slot);
4402 Value &vref = getSlotRef(last);
4403 last = vref.toPrivateUint32();
4404 vref.setUndefined();
4409 if (slot >= numSlots() && !growSlots(cx, slot + 1))
4412 /* JSObject::growSlots or JSObject::freeSlot should set the free slots to void. */
4413 JS_ASSERT(getSlot(slot).isUndefined());
4419 JSObject::freeSlot(JSContext *cx, uint32 slot)
4421 uint32 limit = slotSpan();
4422 JS_ASSERT(slot < limit);
4424 Value &vref = getSlotRef(slot);
4425 if (inDictionaryMode() && lastProp->hasTable()) {
4426 uint32 &last = lastProp->getTable()->freelist;
4428 /* Can't afford to check the whole freelist, but let's check the head. */
4429 JS_ASSERT_IF(last != SHAPE_INVALID_SLOT, last < limit && last != slot);
4432 * Freeing a slot other than the last one mapped by this object's
4433 * shape (and not a reserved slot; see bug 595230): push the slot onto
4434 * the dictionary property table's freelist. We want to let the last
4435 * slot be freed by shrinking the dslots vector; see js_TraceObject.
4437 if (JSSLOT_FREE(clasp) <= slot && slot + 1 < limit) {
4438 JS_ASSERT_IF(last != SHAPE_INVALID_SLOT, last < slotSpan());
4439 vref.setPrivateUint32(last);
4444 vref.setUndefined();
4448 /* JSBOXEDWORD_INT_MAX as a string */
4449 #define JSBOXEDWORD_INT_MAX_STRING "1073741823"
4452 * Convert string indexes that convert to int jsvals as ints to save memory.
4453 * Care must be taken to use this macro every time a property name is used, or
4454 * else double-sets, incorrect property cache misses, or other mistakes could
4458 js_CheckForStringIndex(jsid id)
4460 if (!JSID_IS_ATOM(id))
4463 JSAtom *atom = JSID_TO_ATOM(id);
4464 JSString *str = ATOM_TO_STRING(atom);
4465 const jschar *s = str->flatChars();
4468 JSBool negative = (ch == '-');
4475 size_t n = str->flatLength() - negative;
4476 if (n > sizeof(JSBOXEDWORD_INT_MAX_STRING) - 1)
4479 const jschar *cp = s;
4480 const jschar *end = s + n;
4482 jsuint index = JS7_UNDEC(*cp++);
4483 jsuint oldIndex = 0;
4487 while (JS7_ISDEC(*cp)) {
4490 index = 10 * index + c;
4496 * Non-integer indexes can't be represented as integers. Also, distinguish
4497 * index "-0" from "0", because JSBOXEDWORD_INT cannot.
4499 if (cp != end || (negative && index == 0))
4503 if (oldIndex < -(JSID_INT_MIN / 10) ||
4504 (oldIndex == -(JSID_INT_MIN / 10) && c <= (-JSID_INT_MIN % 10)))
4506 id = INT_TO_JSID(-jsint(index));
4509 if (oldIndex < JSID_INT_MAX / 10 ||
4510 (oldIndex == JSID_INT_MAX / 10 && c <= (JSID_INT_MAX % 10)))
4512 id = INT_TO_JSID(jsint(index));
4520 PurgeProtoChain(JSContext *cx, JSObject *obj, jsid id)
4525 if (!obj->isNative()) {
4526 obj = obj->getProto();
4529 shape = obj->nativeLookup(id);
4531 PCMETER(JS_PROPERTY_CACHE(cx).pcpurges++);
4532 obj->shadowingShapeChange(cx, *shape);
4534 if (!obj->getParent()) {
4536 * All scope chains end in a global object, so this will change
4537 * the global shape. jstracer.cpp assumes that the global shape
4538 * never changes on trace, so we must deep-bail here.
4544 obj = obj->getProto();
4550 js_PurgeScopeChainHelper(JSContext *cx, JSObject *obj, jsid id)
4552 JS_ASSERT(obj->isDelegate());
4553 PurgeProtoChain(cx, obj->getProto(), id);
4556 * We must purge the scope chain only for Call objects as they are the only
4557 * kind of cacheable non-global object that can gain properties after outer
4558 * properties with the same names have been cached or traced. Call objects
4559 * may gain such properties via eval introducing new vars; see bug 490364.
4561 if (obj->isCall()) {
4562 while ((obj = obj->getParent()) != NULL) {
4563 if (PurgeProtoChain(cx, obj, id))
4570 js_AddNativeProperty(JSContext *cx, JSObject *obj, jsid id,
4571 PropertyOp getter, StrictPropertyOp setter, uint32 slot,
4572 uintN attrs, uintN flags, intN shortid)
4574 JS_ASSERT(!(flags & Shape::METHOD));
4577 * Purge the property cache of now-shadowed id in obj's scope chain. Do
4578 * this optimistically (assuming no failure below) before locking obj, so
4579 * we can lock the shadowed scope.
4581 js_PurgeScopeChain(cx, obj, id);
4583 if (!obj->ensureClassReservedSlots(cx))
4586 /* Convert string indices to integers if appropriate. */
4587 id = js_CheckForStringIndex(id);
4588 return obj->putProperty(cx, id, getter, setter, slot, attrs, flags, shortid);
4592 js_ChangeNativePropertyAttrs(JSContext *cx, JSObject *obj,
4593 const Shape *shape, uintN attrs, uintN mask,
4594 PropertyOp getter, StrictPropertyOp setter)
4596 if (!obj->ensureClassReservedSlots(cx))
4600 * Check for freezing an object with shape-memoized methods here, on a
4601 * shape-by-shape basis. Note that getter may be a pun of the method's
4602 * joined function object value, to indicate "no getter change". In this
4603 * case we must null getter to get the desired PropertyStub behavior.
4605 if ((attrs & JSPROP_READONLY) && shape->isMethod()) {
4606 JSObject *funobj = &shape->methodObject();
4607 Value v = ObjectValue(*funobj);
4609 shape = obj->methodReadBarrier(cx, *shape, &v);
4613 if (CastAsObject(getter) == funobj) {
4614 JS_ASSERT(!(attrs & JSPROP_GETTER));
4619 return obj->changeProperty(cx, shape, attrs, mask, getter, setter);
4623 js_DefineProperty(JSContext *cx, JSObject *obj, jsid id, const Value *value,
4624 PropertyOp getter, StrictPropertyOp setter, uintN attrs)
4626 return js_DefineNativeProperty(cx, obj, id, *value, getter, setter, attrs,
4631 * Backward compatibility requires allowing addProperty hooks to mutate the
4632 * nominal initial value of a slotful property, while GC safety wants that
4633 * value to be stored before the call-out through the hook. Optimize to do
4634 * both while saving cycles for classes that stub their addProperty hook.
4637 CallAddPropertyHook(JSContext *cx, Class *clasp, JSObject *obj, const Shape *shape, Value *vp)
4639 if (clasp->addProperty != PropertyStub) {
4640 Value nominal = *vp;
4642 if (!CallJSPropertyOp(cx, clasp->addProperty, obj, shape->id, vp))
4644 if (*vp != nominal) {
4645 if (obj->containsSlot(shape->slot))
4646 obj->nativeSetSlot(shape->slot, *vp);
4653 js_DefineNativeProperty(JSContext *cx, JSObject *obj, jsid id, const Value &value,
4654 PropertyOp getter, StrictPropertyOp setter, uintN attrs,
4655 uintN flags, intN shortid, JSProperty **propp,
4656 uintN defineHow /* = 0 */)
4658 JS_ASSERT((defineHow & ~(JSDNP_CACHE_RESULT | JSDNP_DONT_PURGE | JSDNP_SET_METHOD)) == 0);
4659 LeaveTraceIfGlobalObject(cx, obj);
4661 /* Convert string indices to integers if appropriate. */
4662 id = js_CheckForStringIndex(id);
4665 * If defining a getter or setter, we must check for its counterpart and
4666 * update the attributes and property ops. A getter or setter is really
4667 * only half of a property.
4669 const Shape *shape = NULL;
4670 if (attrs & (JSPROP_GETTER | JSPROP_SETTER)) {
4675 * If JS_THREADSAFE and id is found, js_LookupProperty returns with
4676 * shape non-null and pobj locked. If pobj == obj, the property is
4677 * already in obj and obj has its own (mutable) scope. So if we are
4678 * defining a getter whose setter was already defined, or vice versa,
4679 * finish the job via obj->changeProperty, and refresh the property
4680 * cache line for (obj, id) to map shape.
4682 if (!js_LookupProperty(cx, obj, id, &pobj, &prop))
4684 shape = (Shape *) prop;
4685 if (shape && pobj == obj && shape->isAccessorDescriptor()) {
4686 shape = obj->changeProperty(cx, shape, attrs,
4687 JSPROP_GETTER | JSPROP_SETTER,
4688 (attrs & JSPROP_GETTER)
4691 (attrs & JSPROP_SETTER)
4704 * Purge the property cache of any properties named by id that are about
4705 * to be shadowed in obj's scope chain unless it is known a priori that it
4706 * is not possible. We do this before locking obj to avoid nesting locks.
4708 if (!(defineHow & JSDNP_DONT_PURGE))
4709 js_PurgeScopeChain(cx, obj, id);
4712 * Check whether a readonly property or setter is being defined on a known
4713 * prototype object. See the comment in jscntxt.h before protoHazardShape's
4714 * member declaration.
4716 if (obj->isDelegate() && (attrs & (JSPROP_READONLY | JSPROP_SETTER)))
4717 cx->runtime->protoHazardShape = js_GenerateShape(cx);
4719 /* Use the object's class getter and setter by default. */
4720 Class *clasp = obj->getClass();
4721 if (!(defineHow & JSDNP_SET_METHOD)) {
4722 if (!getter && !(attrs & JSPROP_GETTER))
4723 getter = clasp->getProperty;
4724 if (!setter && !(attrs & JSPROP_SETTER))
4725 setter = clasp->setProperty;
4728 /* Get obj's own scope if it has one, or create a new one for obj. */
4729 if (!obj->ensureClassReservedSlots(cx))
4733 * Make a local copy of value, in case a method barrier needs to update the
4734 * value to define, and just so addProperty can mutate its inout parameter.
4736 Value valueCopy = value;
4737 bool adding = false;
4740 /* Add a new property, or replace an existing one of the same id. */
4741 if (defineHow & JSDNP_SET_METHOD) {
4742 JS_ASSERT(clasp == &js_ObjectClass);
4743 JS_ASSERT(IsFunctionObject(value));
4744 JS_ASSERT(!(attrs & (JSPROP_GETTER | JSPROP_SETTER)));
4745 JS_ASSERT(!getter && !setter);
4747 JSObject *funobj = &value.toObject();
4748 if (FUN_OBJECT(GET_FUNCTION_PRIVATE(cx, funobj)) == funobj) {
4749 flags |= Shape::METHOD;
4750 getter = CastAsPropertyOp(funobj);
4754 if (const Shape *existingShape = obj->nativeLookup(id)) {
4755 if (existingShape->hasSlot())
4756 AbortRecordingIfUnexpectedGlobalWrite(cx, obj, existingShape->slot);
4758 if (existingShape->isMethod() &&
4759 ObjectValue(existingShape->methodObject()) == valueCopy)
4762 * Redefining an existing shape-memoized method object without
4763 * changing the property's value, perhaps to change attributes.
4764 * Clone now via the method read barrier.
4766 * But first, assert that our caller is not trying to preserve
4767 * the joined function object value as the getter object for
4768 * the redefined property. The joined function object cannot
4769 * yet have leaked, so only an internal code path could attempt
4770 * such a thing. Any such path would be a bug to fix.
4772 JS_ASSERT(existingShape->getter() != getter);
4774 if (!obj->methodReadBarrier(cx, *existingShape, &valueCopy))
4781 uint32 oldShape = obj->shape();
4782 shape = obj->putProperty(cx, id, getter, setter, SHAPE_INVALID_SLOT,
4783 attrs, flags, shortid);
4788 * If shape is a joined method, the above call to putProperty suffices
4789 * to update the object's shape id if need be (because the shape's hash
4790 * identity includes the method value).
4792 * But if scope->branded(), the object's shape id may not have changed
4793 * and we may be overwriting a cached function-valued property (note
4794 * how methodWriteBarrier checks previous vs. would-be current value).
4797 if (obj->shape() == oldShape && obj->branded() && shape->slot != SHAPE_INVALID_SLOT) {
4799 const Shape *newshape =
4801 obj->methodWriteBarrier(cx, *shape, valueCopy);
4802 JS_ASSERT(newshape == shape);
4806 /* Store valueCopy before calling addProperty, in case the latter GC's. */
4807 if (obj->containsSlot(shape->slot))
4808 obj->nativeSetSlot(shape->slot, valueCopy);
4810 /* XXXbe called with lock held */
4811 if (!CallAddPropertyHook(cx, clasp, obj, shape, &valueCopy)) {
4812 obj->removeProperty(cx, id);
4816 if (defineHow & JSDNP_CACHE_RESULT) {
4817 JS_ASSERT_NOT_ON_TRACE(cx);
4819 JS_PROPERTY_CACHE(cx).fill(cx, obj, 0, 0, obj, shape, true);
4820 TRACE_1(AddProperty, obj);
4824 *propp = (JSProperty *) shape;
4828 error: // TRACE_1 jumps here on error.
4833 #define SCOPE_DEPTH_ACCUM(bs,val) \
4834 JS_SCOPE_DEPTH_METERING(JS_BASIC_STATS_ACCUM(bs, val))
4837 * Call obj's resolve hook. obj is a native object and the caller holds its
4840 * cx, start, id, and flags are the parameters initially passed to the ongoing
4841 * lookup; objp and propp are its out parameters. obj is an object along
4842 * start's prototype chain.
4844 * There are four possible outcomes:
4846 * - On failure, report an error or exception, unlock obj, and return false.
4848 * - If we are alrady resolving a property of *curobjp, set *recursedp = true,
4849 * unlock obj, and return true.
4851 * - If the resolve hook finds or defines the sought property, set *objp and
4852 * *propp appropriately, set *recursedp = false, and return true with *objp's
4855 * - Otherwise no property was resolved. Set *propp = NULL and *recursedp = false
4859 CallResolveOp(JSContext *cx, JSObject *start, JSObject *obj, jsid id, uintN flags,
4860 JSObject **objp, JSProperty **propp, bool *recursedp)
4862 Class *clasp = obj->getClass();
4863 JSResolveOp resolve = clasp->resolve;
4866 * Avoid recursion on (obj, id) already being resolved on cx.
4868 * Once we have successfully added an entry for (obj, key) to
4869 * cx->resolvingTable, control must go through cleanup: before
4870 * returning. But note that JS_DHASH_ADD may find an existing
4871 * entry, in which case we bail to suppress runaway recursion.
4873 JSResolvingKey key = {obj, id};
4874 JSResolvingEntry *entry;
4875 if (!js_StartResolving(cx, &key, JSRESFLAG_LOOKUP, &entry))
4878 /* Already resolving id in obj -- suppress recursion. */
4882 uint32 generation = cx->resolvingTable->generation;
4888 const Shape *shape = NULL;
4889 if (clasp->flags & JSCLASS_NEW_RESOLVE) {
4890 JSNewResolveOp newresolve = (JSNewResolveOp)resolve;
4891 if (flags == JSRESOLVE_INFER)
4892 flags = js_InferFlags(cx, 0);
4893 JSObject *obj2 = (clasp->flags & JSCLASS_NEW_RESOLVE_GETS_START) ? start : NULL;
4896 /* Protect id and all atoms from a GC nested in resolve. */
4897 AutoKeepAtoms keep(cx->runtime);
4898 ok = newresolve(cx, obj, id, flags, &obj2);
4904 /* Resolved: lookup id again for backward compatibility. */
4905 if (!obj2->isNative()) {
4906 /* Whoops, newresolve handed back a foreign obj2. */
4907 JS_ASSERT(obj2 != obj);
4908 ok = obj2->lookupProperty(cx, id, objp, propp);
4913 * Require that obj2 not be empty now, as we do for old-style
4914 * resolve. If it doesn't, then id was not truly resolved, and
4915 * we'll find it in the proto chain, or miss it if obj2's proto
4916 * is not on obj's proto chain. That last case is a "too bad!"
4919 if (!obj2->nativeEmpty())
4920 shape = obj2->nativeLookup(id);
4923 JS_ASSERT(!obj2->nativeEmpty());
4929 * Old resolve always requires id re-lookup if obj is not empty after
4932 ok = resolve(cx, obj, id);
4935 JS_ASSERT(obj->isNative());
4936 if (!obj->nativeEmpty())
4937 shape = obj->nativeLookup(id);
4943 *propp = (JSProperty *) shape;
4945 js_StopResolving(cx, &key, JSRESFLAG_LOOKUP, entry, generation);
4949 static JS_ALWAYS_INLINE int
4950 js_LookupPropertyWithFlagsInline(JSContext *cx, JSObject *obj, jsid id, uintN flags,
4951 JSObject **objp, JSProperty **propp)
4953 /* We should not get string indices which aren't already integers here. */
4954 JS_ASSERT(id == js_CheckForStringIndex(id));
4956 /* Search scopes starting with obj and following the prototype link. */
4957 JSObject *start = obj;
4959 for (protoIndex = 0; ; protoIndex++) {
4960 const Shape *shape = obj->nativeLookup(id);
4962 SCOPE_DEPTH_ACCUM(&cx->runtime->protoLookupDepthStats, protoIndex);
4964 *propp = (JSProperty *) shape;
4968 /* Try obj's class resolve hook if id was not found in obj's scope. */
4969 if (!shape && obj->getClass()->resolve != JS_ResolveStub) {
4971 if (!CallResolveOp(cx, start, obj, id, flags, objp, propp, &recursed))
4976 /* Recalculate protoIndex in case it was resolved on some other object. */
4978 for (JSObject *proto = start; proto && proto != *objp; proto = proto->getProto())
4980 SCOPE_DEPTH_ACCUM(&cx->runtime->protoLookupDepthStats, protoIndex);
4985 JSObject *proto = obj->getProto();
4988 if (!proto->isNative()) {
4989 if (!proto->lookupProperty(cx, id, objp, propp))
4993 * Non-native objects must have either non-native lookup results,
4994 * or else native results from the non-native's prototype chain.
4996 * See JSStackFrame::getValidCalleeObject, where we depend on this
4997 * fact to force a prototype-delegated joined method accessed via
4998 * arguments.callee through the delegating |this| object's method
5001 if (*propp && (*objp)->isNative()) {
5002 while ((proto = proto->getProto()) != *objp)
5006 return protoIndex + 1;
5017 JS_FRIEND_API(JSBool)
5018 js_LookupProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
5021 /* Convert string indices to integers if appropriate. */
5022 id = js_CheckForStringIndex(id);
5024 return js_LookupPropertyWithFlagsInline(cx, obj, id, cx->resolveFlags, objp, propp) >= 0;
5028 js_LookupPropertyWithFlags(JSContext *cx, JSObject *obj, jsid id, uintN flags,
5029 JSObject **objp, JSProperty **propp)
5031 /* Convert string indices to integers if appropriate. */
5032 id = js_CheckForStringIndex(id);
5034 return js_LookupPropertyWithFlagsInline(cx, obj, id, flags, objp, propp);
5037 PropertyCacheEntry *
5038 js_FindPropertyHelper(JSContext *cx, jsid id, JSBool cacheResult,
5039 JSObject **objp, JSObject **pobjp, JSProperty **propp)
5041 JSObject *scopeChain, *obj, *parent, *pobj;
5042 PropertyCacheEntry *entry;
5043 int scopeIndex, protoIndex;
5046 JS_ASSERT_IF(cacheResult, !JS_ON_TRACE(cx));
5047 scopeChain = &js_GetTopStackFrame(cx)->scopeChain();
5049 /* Scan entries on the scope chain that we can cache across. */
5050 entry = JS_NO_PROP_CACHE_FILL;
5052 parent = obj->getParent();
5053 for (scopeIndex = 0;
5055 ? IsCacheableNonGlobalScope(obj)
5056 : !obj->getOps()->lookupProperty;
5059 js_LookupPropertyWithFlags(cx, obj, id, cx->resolveFlags,
5067 Class *clasp = obj->getClass();
5068 JS_ASSERT(pobj->isNative());
5069 JS_ASSERT(pobj->getClass() == clasp);
5070 if (clasp == &js_BlockClass) {
5072 * A block instance on the scope chain is immutable and it
5073 * shares its shapes with its compile-time prototype.
5075 JS_ASSERT(pobj == obj);
5076 JS_ASSERT(pobj->isClonedBlock());
5077 JS_ASSERT(protoIndex == 0);
5079 /* Call and DeclEnvClass objects have no prototypes. */
5080 JS_ASSERT(!obj->getProto());
5081 JS_ASSERT(protoIndex == 0);
5084 JS_ASSERT(obj->isNative());
5088 * We must check if pobj is native as a global object can have
5089 * non-native prototype.
5091 if (cacheResult && pobj->isNative()) {
5092 entry = JS_PROPERTY_CACHE(cx).fill(cx, scopeChain, scopeIndex,
5096 SCOPE_DEPTH_ACCUM(&cx->runtime->scopeSearchDepthStats, scopeIndex);
5105 parent = obj->getParent();
5109 if (!obj->lookupProperty(cx, id, &pobj, &prop))
5112 PCMETER(JS_PROPERTY_CACHE(cx).nofills++);
5117 * We conservatively assume that a resolve hook could mutate the scope
5118 * chain during JSObject::lookupProperty. So we read parent here again.
5120 parent = obj->getParent();
5129 JS_ASSERT(!!pobj == !!prop);
5137 * On return, if |*pobjp| is a native object, then |*propp| is a |Shape *|.
5138 * Otherwise, its type and meaning depends on the host object's implementation.
5140 JS_FRIEND_API(JSBool)
5141 js_FindProperty(JSContext *cx, jsid id, JSObject **objp, JSObject **pobjp,
5144 return !!js_FindPropertyHelper(cx, id, false, objp, pobjp, propp);
5148 js_FindIdentifierBase(JSContext *cx, JSObject *scopeChain, jsid id)
5151 * This function should not be called for a global object or from the
5152 * trace and should have a valid cache entry for native scopeChain.
5154 JS_ASSERT(scopeChain->getParent());
5155 JS_ASSERT(!JS_ON_TRACE(cx));
5157 JSObject *obj = scopeChain;
5160 * Loop over cacheable objects on the scope chain until we find a
5161 * property. We also stop when we reach the global object skipping any
5162 * farther checks or lookups. For details see the JSOP_BINDNAME case of
5165 * The test order here matters because IsCacheableNonGlobalScope
5166 * must not be passed a global object (i.e. one with null parent).
5168 for (int scopeIndex = 0;
5169 !obj->getParent() || IsCacheableNonGlobalScope(obj);
5173 int protoIndex = js_LookupPropertyWithFlags(cx, obj, id,
5179 if (!pobj->isNative()) {
5180 JS_ASSERT(!obj->getParent());
5183 JS_ASSERT_IF(obj->getParent(), pobj->getClass() == obj->getClass());
5185 PropertyCacheEntry *entry =
5187 JS_PROPERTY_CACHE(cx).fill(cx, scopeChain, scopeIndex, protoIndex, pobj,
5193 JSObject *parent = obj->getParent();
5199 /* Loop until we find a property or reach the global object. */
5203 if (!obj->lookupProperty(cx, id, &pobj, &prop))
5209 * We conservatively assume that a resolve hook could mutate the scope
5210 * chain during JSObject::lookupProperty. So we must check if parent is
5211 * not null here even if it wasn't before the lookup.
5213 JSObject *parent = obj->getParent();
5217 } while (obj->getParent());
5221 static JS_ALWAYS_INLINE JSBool
5222 js_NativeGetInline(JSContext *cx, JSObject *receiver, JSObject *obj, JSObject *pobj,
5223 const Shape *shape, uintN getHow, Value *vp)
5225 LeaveTraceIfGlobalObject(cx, pobj);
5230 JS_ASSERT(pobj->isNative());
5233 if (slot != SHAPE_INVALID_SLOT) {
5234 *vp = pobj->nativeGetSlot(slot);
5235 JS_ASSERT(!vp->isMagic());
5239 if (shape->hasDefaultGetter())
5242 if (JS_UNLIKELY(shape->isMethod()) && (getHow & JSGET_NO_METHOD_BARRIER)) {
5243 JS_ASSERT(&shape->methodObject() == &vp->toObject());
5247 sample = cx->runtime->propertyRemovals;
5249 AutoShapeRooter tvr(cx, shape);
5250 AutoObjectRooter tvr2(cx, pobj);
5251 if (!shape->get(cx, receiver, obj, pobj, vp))
5255 if (pobj->containsSlot(slot) &&
5256 (JS_LIKELY(cx->runtime->propertyRemovals == sample) ||
5257 pobj->nativeContains(*shape))) {
5258 if (!pobj->methodWriteBarrier(cx, *shape, *vp))
5260 pobj->nativeSetSlot(slot, *vp);
5267 js_NativeGet(JSContext *cx, JSObject *obj, JSObject *pobj, const Shape *shape, uintN getHow,
5270 return js_NativeGetInline(cx, obj, obj, pobj, shape, getHow, vp);
5274 js_NativeSet(JSContext *cx, JSObject *obj, const Shape *shape, bool added, bool strict, Value *vp)
5276 LeaveTraceIfGlobalObject(cx, obj);
5281 JS_ASSERT(obj->isNative());
5284 if (slot != SHAPE_INVALID_SLOT) {
5285 JS_ASSERT(obj->containsSlot(slot));
5287 /* If shape has a stub setter, keep obj locked and just store *vp. */
5288 if (shape->hasDefaultSetter()) {
5290 AbortRecordingIfUnexpectedGlobalWrite(cx, obj, slot);
5292 /* FIXME: This should pass *shape, not slot, but see bug 630354. */
5293 if (!obj->methodWriteBarrier(cx, slot, *vp))
5296 obj->nativeSetSlot(slot, *vp);
5301 * Allow API consumers to create shared properties with stub setters.
5302 * Such properties effectively function as data descriptors which are
5303 * not writable, so attempting to set such a property should do nothing
5304 * or throw if we're in strict mode.
5306 if (!shape->hasGetterValue() && shape->hasDefaultSetter())
5307 return js_ReportGetterOnlyAssignment(cx);
5310 sample = cx->runtime->propertyRemovals;
5312 AutoShapeRooter tvr(cx, shape);
5313 if (!shape->set(cx, obj, strict, vp))
5316 JS_ASSERT_IF(!obj->inDictionaryMode(), shape->slot == slot);
5320 if (obj->containsSlot(slot) &&
5321 (JS_LIKELY(cx->runtime->propertyRemovals == sample) ||
5322 obj->nativeContains(*shape))) {
5324 AbortRecordingIfUnexpectedGlobalWrite(cx, obj, slot);
5325 if (!obj->methodWriteBarrier(cx, *shape, *vp))
5328 obj->setSlot(slot, *vp);
5334 static JS_ALWAYS_INLINE bool
5335 js_GetPropertyHelperWithShapeInline(JSContext *cx, JSObject *obj, JSObject *receiver, jsid id,
5336 uintN getHow, Value *vp,
5337 const Shape **shapeOut, JSObject **holderOut)
5339 JSObject *aobj, *obj2;
5344 JS_ASSERT_IF(getHow & JSGET_CACHE_RESULT, !JS_ON_TRACE(cx));
5348 /* Convert string indices to integers if appropriate. */
5349 id = js_CheckForStringIndex(id);
5351 aobj = js_GetProtoIfDenseArray(obj);
5352 /* This call site is hot -- use the always-inlined variant of js_LookupPropertyWithFlags(). */
5353 protoIndex = js_LookupPropertyWithFlagsInline(cx, aobj, id, cx->resolveFlags,
5363 if (!CallJSPropertyOp(cx, obj->getClass()->getProperty, obj, id, vp))
5366 PCMETER(getHow & JSGET_CACHE_RESULT && JS_PROPERTY_CACHE(cx).nofills++);
5369 * Give a strict warning if foo.bar is evaluated by a script for an
5370 * object foo with no property named 'bar'.
5373 if (vp->isUndefined() && ((pc = js_GetCurrentBytecodePC(cx)) != NULL)) {
5378 if (op == JSOP_TRAP) {
5379 JS_ASSERT_NOT_ON_TRACE(cx);
5380 op = JS_GetTrapOpcode(cx, cx->fp()->script(), pc);
5382 if (op == JSOP_GETXPROP) {
5383 flags = JSREPORT_ERROR;
5385 if (!cx->hasStrictOption() ||
5386 (op != JSOP_GETPROP && op != JSOP_GETELEM) ||
5387 js_CurrentPCIsInImacro(cx)) {
5392 * XXX do not warn about missing __iterator__ as the function
5393 * may be called from JS_GetMethodById. See bug 355145.
5395 if (JSID_IS_ATOM(id, cx->runtime->atomState.iteratorAtom))
5398 /* Do not warn about tests like (obj[prop] == undefined). */
5399 if (cx->resolveFlags == JSRESOLVE_INFER) {
5401 pc += js_CodeSpec[op].length;
5402 if (Detecting(cx, pc))
5404 } else if (cx->resolveFlags & JSRESOLVE_DETECTING) {
5408 flags = JSREPORT_WARNING | JSREPORT_STRICT;
5411 /* Ok, bad undefined property reference: whine about it. */
5412 if (!js_ReportValueErrorFlags(cx, flags, JSMSG_UNDEFINED_PROP,
5413 JSDVG_IGNORE_STACK, IdToValue(id),
5414 NULL, NULL, NULL)) {
5421 if (!obj2->isNative()) {
5422 return obj2->isProxy()
5423 ? JSProxy::get(cx, obj2, receiver, id, vp)
5424 : obj2->getProperty(cx, id, vp);
5427 shape = (Shape *) prop;
5430 if (getHow & JSGET_CACHE_RESULT) {
5431 JS_ASSERT_NOT_ON_TRACE(cx);
5432 JS_PROPERTY_CACHE(cx).fill(cx, aobj, 0, protoIndex, obj2, shape);
5435 /* This call site is hot -- use the always-inlined variant of js_NativeGet(). */
5436 if (!js_NativeGetInline(cx, receiver, obj, obj2, shape, getHow, vp))
5443 js_GetPropertyHelperWithShape(JSContext *cx, JSObject *obj, JSObject *receiver, jsid id,
5444 uint32 getHow, Value *vp,
5445 const Shape **shapeOut, JSObject **holderOut)
5447 return js_GetPropertyHelperWithShapeInline(cx, obj, receiver, id, getHow, vp,
5448 shapeOut, holderOut);
5451 static JS_ALWAYS_INLINE JSBool
5452 js_GetPropertyHelperInline(JSContext *cx, JSObject *obj, JSObject *receiver, jsid id,
5453 uint32 getHow, Value *vp)
5457 return js_GetPropertyHelperWithShapeInline(cx, obj, receiver, id, getHow, vp, &shape, &holder);
5461 js_GetPropertyHelper(JSContext *cx, JSObject *obj, jsid id, uint32 getHow, Value *vp)
5463 return js_GetPropertyHelperInline(cx, obj, obj, id, getHow, vp);
5467 js_GetProperty(JSContext *cx, JSObject *obj, JSObject *receiver, jsid id, Value *vp)
5469 /* This call site is hot -- use the always-inlined variant of js_GetPropertyHelper(). */
5470 return js_GetPropertyHelperInline(cx, obj, receiver, id, JSGET_METHOD_BARRIER, vp);
5474 js::GetPropertyDefault(JSContext *cx, JSObject *obj, jsid id, const Value &def, Value *vp)
5478 if (js_LookupPropertyWithFlags(cx, obj, id, JSRESOLVE_QUALIFIED, &obj2, &prop) < 0)
5486 return js_GetProperty(cx, obj2, id, vp);
5490 js_GetMethod(JSContext *cx, JSObject *obj, jsid id, uintN getHow, Value *vp)
5492 JSAutoResolveFlags rf(cx, JSRESOLVE_QUALIFIED);
5494 PropertyIdOp op = obj->getOps()->getProperty;
5496 #if JS_HAS_XML_SUPPORT
5497 JS_ASSERT(!obj->isXML());
5499 return js_GetPropertyHelper(cx, obj, id, getHow, vp);
5501 JS_ASSERT_IF(getHow & JSGET_CACHE_RESULT, obj->isDenseArray());
5502 #if JS_HAS_XML_SUPPORT
5504 return js_GetXMLMethod(cx, obj, id, vp);
5506 return op(cx, obj, obj, id, vp);
5510 js_CheckUndeclaredVarAssignment(JSContext *cx, JSString *propname)
5512 JSStackFrame *const fp = js_GetTopStackFrame(cx);
5516 /* If neither cx nor the code is strict, then no check is needed. */
5517 if (!(fp->isScriptFrame() && fp->script()->strictModeCode) &&
5518 !cx->hasStrictOption()) {
5522 JSAutoByteString bytes(cx, propname);
5524 JS_ReportErrorFlagsAndNumber(cx,
5525 (JSREPORT_WARNING | JSREPORT_STRICT
5526 | JSREPORT_STRICT_MODE_ERROR),
5527 js_GetErrorMessage, NULL,
5528 JSMSG_UNDECLARED_VAR, bytes.ptr());
5532 JSObject::reportReadOnly(JSContext* cx, jsid id, uintN report)
5534 return js_ReportValueErrorFlags(cx, report, JSMSG_READ_ONLY,
5535 JSDVG_IGNORE_STACK, IdToValue(id), NULL,
5540 JSObject::reportNotConfigurable(JSContext* cx, jsid id, uintN report)
5542 return js_ReportValueErrorFlags(cx, report, JSMSG_CANT_DELETE,
5543 JSDVG_IGNORE_STACK, IdToValue(id), NULL,
5548 JSObject::reportNotExtensible(JSContext *cx, uintN report)
5550 return js_ReportValueErrorFlags(cx, report, JSMSG_OBJECT_NOT_EXTENSIBLE,
5551 JSDVG_IGNORE_STACK, ObjectValue(*this),
5556 js_SetPropertyHelper(JSContext *cx, JSObject *obj, jsid id, uintN defineHow,
5557 Value *vp, JSBool strict)
5567 StrictPropertyOp setter;
5570 JS_ASSERT((defineHow &
5571 ~(JSDNP_CACHE_RESULT | JSDNP_SET_METHOD | JSDNP_UNQUALIFIED)) == 0);
5572 if (defineHow & JSDNP_CACHE_RESULT)
5573 JS_ASSERT_NOT_ON_TRACE(cx);
5575 /* Convert string indices to integers if appropriate. */
5576 id = js_CheckForStringIndex(id);
5578 protoIndex = js_LookupPropertyWithFlags(cx, obj, id, cx->resolveFlags,
5583 if (!pobj->isNative()) {
5584 if (pobj->isProxy()) {
5585 AutoPropertyDescriptorRooter pd(cx);
5586 if (!JSProxy::getPropertyDescriptor(cx, pobj, id, true, &pd))
5589 if (pd.attrs & JSPROP_SHARED)
5590 return CallSetter(cx, obj, id, pd.setter, pd.attrs, pd.shortid, strict, vp);
5592 if (pd.attrs & JSPROP_READONLY) {
5594 return obj->reportReadOnly(cx, id);
5595 if (cx->hasStrictOption())
5596 return obj->reportReadOnly(cx, id, JSREPORT_STRICT | JSREPORT_WARNING);
5604 /* We should never add properties to lexical blocks. */
5605 JS_ASSERT(!obj->isBlock());
5607 if (!obj->getParent() &&
5608 (defineHow & JSDNP_UNQUALIFIED) &&
5609 !js_CheckUndeclaredVarAssignment(cx, JSID_TO_STRING(id))) {
5613 shape = (Shape *) prop;
5616 * Now either shape is null, meaning id was not found in obj or one of its
5617 * prototypes; or shape is non-null, meaning id was found directly in pobj.
5619 attrs = JSPROP_ENUMERATE;
5622 clasp = obj->getClass();
5623 getter = clasp->getProperty;
5624 setter = clasp->setProperty;
5627 /* ES5 8.12.4 [[Put]] step 2. */
5628 if (shape->isAccessorDescriptor()) {
5629 if (shape->hasDefaultSetter())
5630 return js_ReportGetterOnlyAssignment(cx);
5632 JS_ASSERT(shape->isDataDescriptor());
5634 if (!shape->writable()) {
5635 PCMETER((defineHow & JSDNP_CACHE_RESULT) && JS_PROPERTY_CACHE(cx).rofills++);
5637 /* Error in strict mode code, warn with strict option, otherwise do nothing. */
5639 return obj->reportReadOnly(cx, id);
5640 if (cx->hasStrictOption())
5641 return obj->reportReadOnly(cx, id, JSREPORT_STRICT | JSREPORT_WARNING);
5646 attrs = shape->attributes();
5649 * We found id in a prototype object: prepare to share or shadow.
5651 if (!shape->shadowable()) {
5652 if (defineHow & JSDNP_CACHE_RESULT)
5653 JS_PROPERTY_CACHE(cx).fill(cx, obj, 0, protoIndex, pobj, shape);
5655 if (shape->hasDefaultSetter() && !shape->hasGetterValue())
5658 return shape->set(cx, obj, strict, vp);
5662 * Preserve attrs except JSPROP_SHARED, getter, and setter when
5663 * shadowing any property that has no slot (is shared). We must
5664 * clear the shared attribute for the shadowing shape so that the
5665 * property in obj that it defines has a slot to retain the value
5666 * being set, in case the setter simply cannot operate on instances
5667 * of obj's class by storing the value in some class-specific
5670 * A subset of slotless shared properties is the set of properties
5671 * with shortids, which must be preserved too. An old API requires
5672 * that the property's getter and setter receive the shortid, not
5673 * id, when they are called on the shadowing property that we are
5674 * about to create in obj.
5676 if (!shape->hasSlot()) {
5677 defineHow &= ~JSDNP_SET_METHOD;
5678 if (shape->hasShortID()) {
5679 flags = Shape::HAS_SHORTID;
5680 shortid = shape->shortid;
5682 attrs &= ~JSPROP_SHARED;
5683 getter = shape->getter();
5684 setter = shape->setter();
5686 /* Restore attrs to the ECMA default for new properties. */
5687 attrs = JSPROP_ENUMERATE;
5691 * Forget we found the proto-property now that we've copied any
5692 * needed member values.
5697 JS_ASSERT_IF(shape && shape->isMethod(), pobj->hasMethodBarrier());
5698 JS_ASSERT_IF(shape && shape->isMethod(),
5699 &pobj->getSlot(shape->slot).toObject() == &shape->methodObject());
5700 if (shape && (defineHow & JSDNP_SET_METHOD)) {
5702 * JSOP_SETMETHOD is assigning to an existing own property. If it
5703 * is an identical method property, do nothing. Otherwise downgrade
5704 * to ordinary assignment. Either way, do not fill the property
5705 * cache, as the interpreter has no fast path for these unusual
5708 bool identical = shape->isMethod() && &shape->methodObject() == &vp->toObject();
5710 shape = obj->methodShapeChange(cx, *shape);
5714 JSObject *funobj = &vp->toObject();
5715 JSFunction *fun = funobj->getFunctionPrivate();
5716 if (fun == funobj) {
5717 funobj = CloneFunctionObject(cx, fun, fun->parent);
5720 vp->setObject(*funobj);
5723 return identical || js_NativeSet(cx, obj, shape, false, strict, vp);
5729 if (!obj->isExtensible()) {
5730 /* Error in strict mode code, warn with strict option, otherwise do nothing. */
5732 return obj->reportNotExtensible(cx);
5733 if (cx->hasStrictOption())
5734 return obj->reportNotExtensible(cx, JSREPORT_STRICT | JSREPORT_WARNING);
5739 * Purge the property cache of now-shadowed id in obj's scope chain.
5740 * Do this early, before locking obj to avoid nesting locks.
5742 js_PurgeScopeChain(cx, obj, id);
5744 /* Find or make a property descriptor with the right heritage. */
5745 if (!obj->ensureClassReservedSlots(cx))
5749 * Check for Object class here to avoid defining a method on a class
5750 * with magic resolve, addProperty, getProperty, etc. hooks.
5752 if ((defineHow & JSDNP_SET_METHOD) && obj->canHaveMethodBarrier()) {
5753 JS_ASSERT(IsFunctionObject(*vp));
5754 JS_ASSERT(!(attrs & (JSPROP_GETTER | JSPROP_SETTER)));
5756 JSObject *funobj = &vp->toObject();
5757 JSFunction *fun = GET_FUNCTION_PRIVATE(cx, funobj);
5758 if (fun == funobj) {
5759 flags |= Shape::METHOD;
5760 getter = CastAsPropertyOp(funobj);
5764 shape = obj->putProperty(cx, id, getter, setter, SHAPE_INVALID_SLOT,
5765 attrs, flags, shortid);
5769 if (defineHow & JSDNP_CACHE_RESULT)
5770 TRACE_1(AddProperty, obj);
5773 * Initialize the new property value (passed to setter) to undefined.
5774 * Note that we store before calling addProperty, to match the order
5775 * in js_DefineNativeProperty.
5777 if (obj->containsSlot(shape->slot))
5778 obj->nativeSetSlot(shape->slot, UndefinedValue());
5780 /* XXXbe called with obj locked */
5781 if (!CallAddPropertyHook(cx, clasp, obj, shape, vp)) {
5782 obj->removeProperty(cx, id);
5788 if (defineHow & JSDNP_CACHE_RESULT)
5789 JS_PROPERTY_CACHE(cx).fill(cx, obj, 0, 0, obj, shape, added);
5791 return js_NativeSet(cx, obj, shape, added, strict, vp);
5794 error: // TRACE_1 jumps here in case of error.
5800 js_SetProperty(JSContext *cx, JSObject *obj, jsid id, Value *vp, JSBool strict)
5802 return js_SetPropertyHelper(cx, obj, id, 0, vp, strict);
5806 js_GetAttributes(JSContext *cx, JSObject *obj, jsid id, uintN *attrsp)
5809 if (!js_LookupProperty(cx, obj, id, &obj, &prop))
5815 if (!obj->isNative())
5816 return obj->getAttributes(cx, id, attrsp);
5818 const Shape *shape = (Shape *)prop;
5819 *attrsp = shape->attributes();
5824 js_SetNativeAttributes(JSContext *cx, JSObject *obj, Shape *shape, uintN attrs)
5826 JS_ASSERT(obj->isNative());
5827 return !!js_ChangeNativePropertyAttrs(cx, obj, shape, attrs, 0,
5828 shape->getter(), shape->setter());
5832 js_SetAttributes(JSContext *cx, JSObject *obj, jsid id, uintN *attrsp)
5835 if (!js_LookupProperty(cx, obj, id, &obj, &prop))
5839 return obj->isNative()
5840 ? js_SetNativeAttributes(cx, obj, (Shape *) prop, *attrsp)
5841 : obj->setAttributes(cx, id, attrsp);
5845 js_DeleteProperty(JSContext *cx, JSObject *obj, jsid id, Value *rval, JSBool strict)
5851 rval->setBoolean(true);
5853 /* Convert string indices to integers if appropriate. */
5854 id = js_CheckForStringIndex(id);
5856 if (!js_LookupProperty(cx, obj, id, &proto, &prop))
5858 if (!prop || proto != obj) {
5860 * If the property was found in a native prototype, check whether it's
5861 * shared and permanent. Such a property stands for direct properties
5862 * in all delegating objects, matching ECMA semantics without bloating
5863 * each delegating object.
5865 if (prop && proto->isNative()) {
5866 shape = (Shape *)prop;
5867 if (shape->isSharedPermanent()) {
5869 return obj->reportNotConfigurable(cx, id);
5870 rval->setBoolean(false);
5876 * If no property, or the property comes unshared or impermanent from
5877 * a prototype, call the class's delProperty hook, passing rval as the
5880 return CallJSPropertyOp(cx, obj->getClass()->delProperty, obj, id, rval);
5883 shape = (Shape *)prop;
5884 if (!shape->configurable()) {
5886 return obj->reportNotConfigurable(cx, id);
5887 rval->setBoolean(false);
5891 if (!CallJSPropertyOp(cx, obj->getClass()->delProperty, obj, SHAPE_USERID(shape), rval))
5894 if (obj->containsSlot(shape->slot)) {
5895 const Value &v = obj->nativeGetSlot(shape->slot);
5899 * Delete is rare enough that we can take the hit of checking for an
5900 * active cloned method function object that must be homed to a callee
5901 * slot on the active stack frame before this delete completes, in case
5902 * someone saved the clone and checks it against foo.caller for a foo
5903 * called from the active method.
5905 * We do not check suspended frames. They can't be reached via caller,
5906 * so the only way they could have the method's joined function object
5907 * as callee is through an API abusage. We break any such edge case.
5909 if (obj->hasMethodBarrier()) {
5912 if (IsFunctionObject(v, &funobj)) {
5913 JSFunction *fun = GET_FUNCTION_PRIVATE(cx, funobj);
5915 if (fun != funobj) {
5916 for (JSStackFrame *fp = cx->maybefp(); fp; fp = fp->prev()) {
5917 if (fp->isFunctionFrame() &&
5918 &fp->callee() == &fun->compiledFunObj() &&
5919 fp->thisValue().isObject())
5921 JSObject *tmp = &fp->thisValue().toObject();
5924 fp->calleeValue().setObject(*funobj);
5927 } while ((tmp = tmp->getProto()) != NULL);
5935 return obj->removeProperty(cx, id) && js_SuppressDeletedProperty(cx, obj, id);
5941 HasNativeMethod(JSObject *obj, jsid methodid, Native native)
5943 const Shape *shape = obj->nativeLookup(methodid);
5944 if (!shape || !shape->hasDefaultGetter() || !obj->containsSlot(shape->slot))
5947 const Value &fval = obj->nativeGetSlot(shape->slot);
5949 if (!IsFunctionObject(fval, &funobj) || funobj->getFunctionPrivate()->maybeNative() != native)
5956 DefaultValue(JSContext *cx, JSObject *obj, JSType hint, Value *vp)
5958 JS_ASSERT(hint != JSTYPE_OBJECT && hint != JSTYPE_FUNCTION);
5960 Value v = ObjectValue(*obj);
5961 if (hint == JSTYPE_STRING) {
5962 /* Optimize (new String(...)).toString(). */
5963 if (obj->getClass() == &js_StringClass &&
5964 ClassMethodIsNative(cx, obj,
5966 ATOM_TO_JSID(cx->runtime->atomState.toStringAtom),
5968 *vp = obj->getPrimitiveThis();
5972 if (!js_TryMethod(cx, obj, cx->runtime->atomState.toStringAtom, 0, NULL, &v))
5974 if (!v.isPrimitive()) {
5975 if (!obj->getClass()->convert(cx, obj, hint, &v))
5979 /* Optimize (new String(...)).valueOf(). */
5980 Class *clasp = obj->getClass();
5981 if ((clasp == &js_StringClass &&
5982 ClassMethodIsNative(cx, obj, &js_StringClass,
5983 ATOM_TO_JSID(cx->runtime->atomState.valueOfAtom),
5984 js_str_toString)) ||
5985 (clasp == &js_NumberClass &&
5986 ClassMethodIsNative(cx, obj, &js_NumberClass,
5987 ATOM_TO_JSID(cx->runtime->atomState.valueOfAtom),
5989 *vp = obj->getPrimitiveThis();
5993 if (!obj->getClass()->convert(cx, obj, hint, &v))
5996 JS_ASSERT(hint != TypeOfValue(cx, v));
5997 if (!js_TryMethod(cx, obj, cx->runtime->atomState.toStringAtom, 0, NULL, &v))
6002 /* Avoid recursive death when decompiling in js_ReportValueError. */
6004 if (hint == JSTYPE_STRING) {
6005 str = JS_InternString(cx, obj->getClass()->name);
6011 vp->setObject(*obj);
6012 js_ReportValueError2(cx, JSMSG_CANT_CONVERT_TO,
6013 JSDVG_SEARCH_STACK, *vp, str,
6014 (hint == JSTYPE_VOID)
6016 : JS_TYPE_STR(hint));
6023 } /* namespace js */
6025 JS_FRIEND_API(JSBool)
6026 js_Enumerate(JSContext *cx, JSObject *obj, JSIterateOp enum_op, Value *statep, jsid *idp)
6028 /* If the class has a custom JSCLASS_NEW_ENUMERATE hook, call it. */
6029 Class *clasp = obj->getClass();
6030 JSEnumerateOp enumerate = clasp->enumerate;
6031 if (clasp->flags & JSCLASS_NEW_ENUMERATE) {
6032 JS_ASSERT(enumerate != JS_EnumerateStub);
6033 return ((NewEnumerateOp) enumerate)(cx, obj, enum_op, statep, idp);
6036 if (!enumerate(cx, obj))
6039 /* Tell InitNativeIterator to treat us like a native object. */
6040 JS_ASSERT(enum_op == JSENUMERATE_INIT || enum_op == JSENUMERATE_INIT_ALL);
6041 statep->setMagic(JS_NATIVE_ENUMERATE);
6048 CheckAccess(JSContext *cx, JSObject *obj, jsid id, JSAccessMode mode,
6049 Value *vp, uintN *attrsp)
6056 JSSecurityCallbacks *callbacks;
6057 CheckAccessOp check;
6059 while (JS_UNLIKELY(obj->getClass() == &js_WithClass))
6060 obj = obj->getProto();
6062 writing = (mode & JSACC_WRITE) != 0;
6063 switch (mode & JSACC_TYPEMASK) {
6067 vp->setObjectOrNull(obj->getProto());
6068 *attrsp = JSPROP_PERMANENT;
6072 JS_ASSERT(!writing);
6074 vp->setObject(*obj->getParent());
6075 *attrsp = JSPROP_READONLY | JSPROP_PERMANENT;
6079 if (!obj->lookupProperty(cx, id, &pobj, &prop))
6089 if (!pobj->isNative()) {
6097 shape = (Shape *)prop;
6098 *attrsp = shape->attributes();
6100 if (pobj->containsSlot(shape->slot))
6101 *vp = pobj->nativeGetSlot(shape->slot);
6108 * If obj's class has a stub (null) checkAccess hook, use the per-runtime
6109 * checkObjectAccess callback, if configured.
6111 * We don't want to require all classes to supply a checkAccess hook; we
6112 * need that hook only for certain classes used when precompiling scripts
6113 * and functions ("brutal sharing"). But for general safety of built-in
6114 * magic properties like __proto__, we route all access checks, even for
6115 * classes that stub out checkAccess, through the global checkObjectAccess
6116 * hook. This covers precompilation-based sharing and (possibly
6117 * unintended) runtime sharing across trust boundaries.
6119 clasp = pobj->getClass();
6120 check = clasp->checkAccess;
6122 callbacks = JS_GetSecurityCallbacks(cx);
6123 check = callbacks ? Valueify(callbacks->checkObjectAccess) : NULL;
6125 return !check || check(cx, pobj, id, mode, vp);
6131 js_TypeOf(JSContext *cx, JSObject *obj)
6134 * ECMA 262, 11.4.3 says that any native object that implements
6135 * [[Call]] should be of type "function". However, RegExp is of
6136 * type "object", not "function", for Web compatibility.
6138 if (obj->isCallable()) {
6139 return (obj->getClass() != &js_RegExpClass)
6144 return JSTYPE_OBJECT;
6148 js_IsDelegate(JSContext *cx, JSObject *obj, const Value &v)
6150 if (v.isPrimitive())
6152 JSObject *obj2 = &v.toObject();
6153 while ((obj2 = obj2->getProto()) != NULL) {
6161 js::FindClassPrototype(JSContext *cx, JSObject *scopeobj, JSProtoKey protoKey,
6162 JSObject **protop, Class *clasp)
6165 if (!js_FindClassObject(cx, scopeobj, protoKey, &v, clasp))
6168 if (IsFunctionObject(v)) {
6169 JSObject *ctor = &v.toObject();
6170 if (!ctor->getProperty(cx, ATOM_TO_JSID(cx->runtime->atomState.classPrototypeAtom), &v))
6174 *protop = v.isObject() ? &v.toObject() : NULL;
6179 * The first part of this function has been hand-expanded and optimized into
6180 * NewBuiltinClassInstance in jsobjinlines.h.
6183 js_GetClassPrototype(JSContext *cx, JSObject *scopeobj, JSProtoKey protoKey,
6184 JSObject **protop, Class *clasp)
6186 VOUCH_DOES_NOT_REQUIRE_STACK();
6187 JS_ASSERT(JSProto_Null <= protoKey);
6188 JS_ASSERT(protoKey < JSProto_LIMIT);
6190 if (protoKey != JSProto_Null) {
6193 scopeobj = &cx->fp()->scopeChain();
6195 scopeobj = cx->globalObject;
6202 scopeobj = scopeobj->getGlobal();
6203 if (scopeobj->isGlobal()) {
6204 const Value &v = scopeobj->getReservedSlot(JSProto_LIMIT + protoKey);
6206 *protop = &v.toObject();
6212 return FindClassPrototype(cx, scopeobj, protoKey, protop, clasp);
6216 js_SetClassPrototype(JSContext *cx, JSObject *ctor, JSObject *proto, uintN attrs)
6219 * Use the given attributes for the prototype property of the constructor,
6220 * as user-defined constructors have a DontDelete prototype (which may be
6221 * reset), while native or "system" constructors have DontEnum | ReadOnly |
6224 if (!ctor->defineProperty(cx, ATOM_TO_JSID(cx->runtime->atomState.classPrototypeAtom),
6225 ObjectOrNullValue(proto), PropertyStub, StrictPropertyStub, attrs)) {
6230 * ECMA says that Object.prototype.constructor, or f.prototype.constructor
6231 * for a user-defined function f, is DontEnum.
6233 return proto->defineProperty(cx, ATOM_TO_JSID(cx->runtime->atomState.constructorAtom),
6234 ObjectOrNullValue(ctor), PropertyStub, StrictPropertyStub, 0);
6238 PrimitiveToObject(JSContext *cx, const Value &v)
6240 JS_ASSERT(v.isPrimitive());
6244 clasp = &js_NumberClass;
6245 } else if (v.isString()) {
6246 clasp = &js_StringClass;
6248 JS_ASSERT(v.isBoolean());
6249 clasp = &js_BooleanClass;
6252 JSObject *obj = NewBuiltinClassInstance(cx, clasp);
6256 obj->setPrimitiveThis(v);
6261 js_PrimitiveToObject(JSContext *cx, Value *vp)
6263 JSObject *obj = PrimitiveToObject(cx, *vp);
6267 vp->setObject(*obj);
6272 js_ValueToObjectOrNull(JSContext *cx, const Value &v, JSObject **objp)
6276 if (v.isObjectOrNull()) {
6277 obj = v.toObjectOrNull();
6278 } else if (v.isUndefined()) {
6281 obj = PrimitiveToObject(cx, v);
6291 /* Callers must handle the already-object case . */
6293 ToObjectSlow(JSContext *cx, Value *vp)
6295 JS_ASSERT(!vp->isMagic());
6296 JS_ASSERT(!vp->isObject());
6298 if (vp->isNullOrUndefined()) {
6299 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CANT_CONVERT_TO,
6300 vp->isNull() ? "null" : "undefined", "object");
6304 JSObject *obj = PrimitiveToObject(cx, *vp);
6306 vp->setObject(*obj);
6313 js_ValueToNonNullObject(JSContext *cx, const Value &v)
6317 if (!js_ValueToObjectOrNull(cx, v, &obj))
6320 js_ReportIsNullOrUndefined(cx, JSDVG_SEARCH_STACK, v, NULL);
6325 js_TryValueOf(JSContext *cx, JSObject *obj, JSType type, Value *rval)
6329 argv[0].setString(ATOM_TO_STRING(cx->runtime->atomState.typeAtoms[type]));
6330 return js_TryMethod(cx, obj, cx->runtime->atomState.valueOfAtom,
6335 js_TryMethod(JSContext *cx, JSObject *obj, JSAtom *atom,
6336 uintN argc, Value *argv, Value *rval)
6338 JS_CHECK_RECURSION(cx, return JS_FALSE);
6341 * Report failure only if an appropriate method was found, and calling it
6342 * returned failure. We propagate failure in this case to make exceptions
6345 JSErrorReporter older = JS_SetErrorReporter(cx, NULL);
6346 jsid id = ATOM_TO_JSID(atom);
6348 JSBool ok = js_GetMethod(cx, obj, id, JSGET_NO_METHOD_BARRIER, &fval);
6349 JS_SetErrorReporter(cx, older);
6353 if (fval.isPrimitive())
6355 return ExternalInvoke(cx, ObjectValue(*obj), fval, argc, argv, rval);
6361 js_XDRObject(JSXDRState *xdr, JSObject **objp)
6366 uint32 classId, classDef;
6367 JSProtoKey protoKey;
6372 if (xdr->mode == JSXDR_ENCODE) {
6373 clasp = (*objp)->getClass();
6374 classId = JS_XDRFindClassIdByName(xdr, clasp->name);
6375 classDef = !classId;
6377 if (!JS_XDRRegisterClass(xdr, Jsvalify(clasp), &classId))
6379 protoKey = JSCLASS_CACHED_PROTO_KEY(clasp);
6380 if (protoKey != JSProto_Null) {
6381 classDef |= (protoKey << 1);
6383 atom = js_Atomize(cx, clasp->name, strlen(clasp->name), 0);
6389 clasp = NULL; /* quell GCC overwarning */
6394 * XDR a flag word, which could be 0 for a class use, in which case no
6395 * name follows, only the id in xdr's class registry; 1 for a class def,
6396 * in which case the flag word is followed by the class name transferred
6397 * from or to atom; or a value greater than 1, an odd number that when
6398 * divided by two yields the JSProtoKey for class. In the last case, as
6399 * in the 0 classDef case, no name is transferred via atom.
6401 if (!JS_XDRUint32(xdr, &classDef))
6403 if (classDef == 1 && !js_XDRAtom(xdr, &atom))
6406 if (!JS_XDRUint32(xdr, &classId))
6409 if (xdr->mode == JSXDR_DECODE) {
6411 /* NB: we know that JSProto_Null is 0 here, for backward compat. */
6412 protoKey = (JSProtoKey) (classDef >> 1);
6413 if (!js_GetClassPrototype(cx, NULL, protoKey, &proto, clasp))
6415 clasp = proto->getClass();
6416 if (!JS_XDRRegisterClass(xdr, Jsvalify(clasp), &classId))
6419 clasp = Valueify(JS_XDRFindClassById(xdr, classId));
6422 JS_snprintf(numBuf, sizeof numBuf, "%ld", (long)classId);
6423 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
6424 JSMSG_CANT_FIND_CLASS, numBuf);
6430 if (!clasp->xdrObject) {
6431 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
6432 JSMSG_CANT_XDR_CLASS, clasp->name);
6435 return clasp->xdrObject(xdr, objp);
6438 #endif /* JS_HAS_XDR */
6440 #ifdef JS_DUMP_SCOPE_METERS
6444 JSBasicStats js_entry_count_bs = JS_INIT_STATIC_BASIC_STATS;
6447 MeterEntryCount(uintN count)
6449 JS_BASIC_STATS_ACCUM(&js_entry_count_bs, count);
6453 js_DumpScopeMeters(JSRuntime *rt)
6457 logfp = fopen("/tmp/scope.stats", "a");
6462 mean = JS_MeanAndStdDevBS(&js_entry_count_bs, &sigma);
6464 fprintf(logfp, "scopes %u entries %g mean %g sigma %g max %u",
6465 js_entry_count_bs.num, js_entry_count_bs.sum, mean, sigma,
6466 js_entry_count_bs.max);
6469 JS_DumpHistogram(&js_entry_count_bs, logfp);
6470 JS_BASIC_STATS_INIT(&js_entry_count_bs);
6477 js_PrintObjectSlotName(JSTracer *trc, char *buf, size_t bufsize)
6479 JS_ASSERT(trc->debugPrinter == js_PrintObjectSlotName);
6481 JSObject *obj = (JSObject *)trc->debugPrintArg;
6482 uint32 slot = (uint32)trc->debugPrintIndex;
6485 if (obj->isNative()) {
6486 shape = obj->lastProperty();
6487 while (shape->previous() && shape->slot != slot)
6488 shape = shape->previous();
6489 if (shape->slot != slot)
6496 const char *slotname = NULL;
6497 if (obj->isGlobal()) {
6498 #define JS_PROTO(name,code,init) \
6499 if ((code) == slot) { slotname = js_##name##_str; goto found; }
6500 #include "jsproto.tbl"
6505 JS_snprintf(buf, bufsize, "CLASS_OBJECT(%s)", slotname);
6507 JS_snprintf(buf, bufsize, "**UNKNOWN SLOT %ld**", (long)slot);
6509 jsid id = shape->id;
6510 if (JSID_IS_INT(id)) {
6511 JS_snprintf(buf, bufsize, "%ld", (long)JSID_TO_INT(id));
6512 } else if (JSID_IS_ATOM(id)) {
6513 PutEscapedString(buf, bufsize, JSID_TO_ATOM(id), 0);
6515 JS_snprintf(buf, bufsize, "**FINALIZED ATOM KEY**");
6522 js_TraceObject(JSTracer *trc, JSObject *obj)
6524 JS_ASSERT(obj->isNative());
6526 JSContext *cx = trc->context;
6527 if (obj->hasSlotsArray() && !obj->nativeEmpty() && IS_GC_MARKING_TRACER(trc)) {
6529 * Trim overlong dslots allocations from the GC, to avoid thrashing in
6530 * case of delete-happy code that settles down at a given population.
6531 * The !obj->nativeEmpty() guard above is due to the bug described by
6532 * the FIXME comment below.
6534 size_t slots = obj->slotSpan();
6535 if (obj->numSlots() != slots)
6536 obj->shrinkSlots(cx, slots);
6539 #ifdef JS_DUMP_SCOPE_METERS
6540 MeterEntryCount(obj->propertyCount);
6545 if (!JS_CLIST_IS_EMPTY(&cx->runtime->watchPointList))
6546 js_TraceWatchPoints(trc, obj);
6548 /* No one runs while the GC is running, so we can use LOCKED_... here. */
6549 Class *clasp = obj->getClass();
6551 if (clasp->flags & JSCLASS_MARK_IS_TRACE)
6552 ((JSTraceOp) clasp->mark)(trc, obj);
6553 else if (IS_GC_MARKING_TRACER(trc))
6554 (void) clasp->mark(cx, obj, trc);
6556 if (clasp->flags & JSCLASS_IS_GLOBAL) {
6557 JSCompartment *compartment = obj->getCompartment();
6558 compartment->mark(trc);
6562 * NB: clasp->mark could mutate something (which would be a bug, but we are
6563 * defensive), so don't hoist this above calling clasp->mark.
6565 uint32 nslots = Min(obj->numSlots(), obj->slotSpan());
6566 for (uint32 i = 0; i != nslots; ++i) {
6567 const Value &v = obj->getSlot(i);
6568 JS_SET_TRACING_DETAILS(trc, js_PrintObjectSlotName, obj, i);
6569 MarkValueRaw(trc, v);
6574 js_ClearNative(JSContext *cx, JSObject *obj)
6577 * Clear obj of all obj's properties. FIXME: we do not clear reserved slots
6578 * lying below JSSLOT_FREE(clasp). JS_ClearScope does that.
6580 if (!obj->nativeEmpty()) {
6581 /* Now that we're done using real properties, clear obj. */
6584 /* Clear slot values since obj->clear reset our shape to empty. */
6585 uint32 freeslot = JSSLOT_FREE(obj->getClass());
6586 uint32 n = obj->numSlots();
6587 for (uint32 i = freeslot; i < n; ++i)
6588 obj->setSlot(i, UndefinedValue());
6593 js_GetReservedSlot(JSContext *cx, JSObject *obj, uint32 slot, Value *vp)
6595 if (!obj->isNative()) {
6600 if (slot < obj->numSlots())
6601 *vp = obj->getSlot(slot);
6608 js_SetReservedSlot(JSContext *cx, JSObject *obj, uint32 slot, const Value &v)
6610 if (!obj->isNative())
6613 Class *clasp = obj->getClass();
6615 if (slot >= obj->numSlots()) {
6616 uint32 nslots = JSSLOT_FREE(clasp);
6617 JS_ASSERT(slot < nslots);
6618 if (!obj->allocSlots(cx, nslots))
6622 obj->setSlot(slot, v);
6623 GC_POKE(cx, JS_NULL);
6628 JSObject::getGlobal() const
6630 JSObject *obj = const_cast<JSObject *>(this);
6631 while (JSObject *parent = obj->getParent())
6637 js_ReportGetterOnlyAssignment(JSContext *cx)
6639 return JS_ReportErrorFlagsAndNumber(cx,
6640 JSREPORT_WARNING | JSREPORT_STRICT |
6641 JSREPORT_STRICT_MODE_ERROR,
6642 js_GetErrorMessage, NULL,
6646 JS_FRIEND_API(JSBool)
6647 js_GetterOnlyPropertyStub(JSContext *cx, JSObject *obj, jsid id, JSBool strict, jsval *vp)
6649 JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_GETTER_ONLY);
6656 * Routines to print out values during debugging. These are FRIEND_API to help
6657 * the debugger find them and to support temporarily hacking js_Dump* calls
6662 dumpChars(const jschar *s, size_t n)
6666 if (n == (size_t) -1) {
6671 for (i = 0; i < n; i++) {
6673 fprintf(stderr, "\\n");
6674 else if (s[i] == '\t')
6675 fprintf(stderr, "\\t");
6676 else if (s[i] >= 32 && s[i] < 127)
6677 fputc(s[i], stderr);
6678 else if (s[i] <= 255)
6679 fprintf(stderr, "\\x%02x", (unsigned int) s[i]);
6681 fprintf(stderr, "\\u%04x", (unsigned int) s[i]);
6687 js_DumpChars(const jschar *s, size_t n)
6689 fprintf(stderr, "jschar * (%p) = ", (void *) s);
6691 fputc('\n', stderr);
6695 dumpString(JSString *str)
6697 if (const jschar *chars = str->getChars(NULL))
6698 dumpChars(chars, str->length());
6700 fprintf(stderr, "(oom in dumpString)");
6704 js_DumpString(JSString *str)
6706 if (const jschar *chars = str->getChars(NULL)) {
6707 fprintf(stderr, "JSString* (%p) = jschar * (%p) = ",
6708 (void *) str, (void *) chars);
6711 fprintf(stderr, "(oom in JS_DumpString)");
6713 fputc('\n', stderr);
6717 js_DumpAtom(JSAtom *atom)
6719 fprintf(stderr, "JSAtom* (%p) = ", (void *) atom);
6720 js_DumpString(ATOM_TO_STRING(atom));
6724 dumpValue(const Value &v)
6727 fprintf(stderr, "null");
6728 else if (v.isUndefined())
6729 fprintf(stderr, "undefined");
6730 else if (v.isInt32())
6731 fprintf(stderr, "%d", v.toInt32());
6732 else if (v.isDouble())
6733 fprintf(stderr, "%g", v.toDouble());
6734 else if (v.isString())
6735 dumpString(v.toString());
6736 else if (v.isObject() && v.toObject().isFunction()) {
6737 JSObject *funobj = &v.toObject();
6738 JSFunction *fun = GET_FUNCTION_PRIVATE(cx, funobj);
6740 fputs("<function ", stderr);
6741 FileEscapedString(stderr, ATOM_TO_STRING(fun->atom), 0);
6743 fputs("<unnamed function", stderr);
6745 if (fun->isInterpreted()) {
6746 JSScript *script = fun->script();
6747 fprintf(stderr, " (%s:%u)",
6748 script->filename ? script->filename : "", script->lineno);
6750 fprintf(stderr, " at %p (JSFunction at %p)>", (void *) funobj, (void *) fun);
6751 } else if (v.isObject()) {
6752 JSObject *obj = &v.toObject();
6753 Class *clasp = obj->getClass();
6754 fprintf(stderr, "<%s%s at %p>",
6756 (clasp == &js_ObjectClass) ? "" : " object",
6758 } else if (v.isBoolean()) {
6760 fprintf(stderr, "true");
6762 fprintf(stderr, "false");
6763 } else if (v.isMagic()) {
6764 fprintf(stderr, "<invalid");
6766 switch (v.whyMagic()) {
6767 case JS_ARRAY_HOLE: fprintf(stderr, " array hole"); break;
6768 case JS_ARGS_HOLE: fprintf(stderr, " args hole"); break;
6769 case JS_NATIVE_ENUMERATE: fprintf(stderr, " native enumeration"); break;
6770 case JS_NO_ITER_VALUE: fprintf(stderr, " no iter value"); break;
6771 case JS_GENERATOR_CLOSING: fprintf(stderr, " generator closing"); break;
6772 default: fprintf(stderr, " ?!"); break;
6775 fprintf(stderr, ">");
6777 fprintf(stderr, "unexpected value");
6782 js_DumpValue(const Value &val)
6785 fputc('\n', stderr);
6791 fprintf(stderr, "jsid %p = ", (void *) JSID_BITS(id));
6792 dumpValue(IdToValue(id));
6793 fputc('\n', stderr);
6797 DumpProperty(JSObject *obj, const Shape &shape)
6800 uint8 attrs = shape.attributes();
6802 fprintf(stderr, " ((Shape *) %p) ", (void *) &shape);
6803 if (attrs & JSPROP_ENUMERATE) fprintf(stderr, "enumerate ");
6804 if (attrs & JSPROP_READONLY) fprintf(stderr, "readonly ");
6805 if (attrs & JSPROP_PERMANENT) fprintf(stderr, "permanent ");
6806 if (attrs & JSPROP_SHARED) fprintf(stderr, "shared ");
6807 if (shape.isAlias()) fprintf(stderr, "alias ");
6808 if (shape.isMethod()) fprintf(stderr, "method=%p ", (void *) &shape.methodObject());
6810 if (shape.hasGetterValue())
6811 fprintf(stderr, "getterValue=%p ", (void *) shape.getterObject());
6812 else if (!shape.hasDefaultGetter())
6813 fprintf(stderr, "getterOp=%p ", JS_FUNC_TO_DATA_PTR(void *, shape.getterOp()));
6815 if (shape.hasSetterValue())
6816 fprintf(stderr, "setterValue=%p ", (void *) shape.setterObject());
6817 else if (shape.setterOp() == js_watch_set)
6818 fprintf(stderr, "setterOp=js_watch_set ");
6819 else if (!shape.hasDefaultSetter())
6820 fprintf(stderr, "setterOp=%p ", JS_FUNC_TO_DATA_PTR(void *, shape.setterOp()));
6822 if (JSID_IS_ATOM(id))
6823 dumpString(JSID_TO_STRING(id));
6824 else if (JSID_IS_INT(id))
6825 fprintf(stderr, "%d", (int) JSID_TO_INT(id));
6827 fprintf(stderr, "unknown jsid %p", (void *) JSID_BITS(id));
6828 fprintf(stderr, ": slot %d", shape.slot);
6829 if (obj->containsSlot(shape.slot)) {
6830 fprintf(stderr, " = ");
6831 dumpValue(obj->getSlot(shape.slot));
6832 } else if (shape.slot != SHAPE_INVALID_SLOT) {
6833 fprintf(stderr, " (INVALID!)");
6835 fprintf(stderr, "\n");
6839 js_DumpObject(JSObject *obj)
6841 fprintf(stderr, "object %p\n", (void *) obj);
6842 Class *clasp = obj->getClass();
6843 fprintf(stderr, "class %p %s\n", (void *)clasp, clasp->name);
6845 fprintf(stderr, "flags:");
6846 uint32 flags = obj->flags;
6847 if (flags & JSObject::DELEGATE) fprintf(stderr, " delegate");
6848 if (flags & JSObject::SYSTEM) fprintf(stderr, " system");
6849 if (flags & JSObject::NOT_EXTENSIBLE) fprintf(stderr, " not_extensible");
6850 if (flags & JSObject::BRANDED) fprintf(stderr, " branded");
6851 if (flags & JSObject::GENERIC) fprintf(stderr, " generic");
6852 if (flags & JSObject::METHOD_BARRIER) fprintf(stderr, " method_barrier");
6853 if (flags & JSObject::INDEXED) fprintf(stderr, " indexed");
6854 if (flags & JSObject::OWN_SHAPE) fprintf(stderr, " own_shape");
6855 if (flags & JSObject::HAS_EQUALITY) fprintf(stderr, " has_equality");
6857 bool anyFlags = flags != 0;
6858 if (obj->isNative()) {
6859 if (obj->inDictionaryMode()) {
6860 fprintf(stderr, " inDictionaryMode");
6863 if (obj->hasPropertyTable()) {
6864 fprintf(stderr, " hasPropertyTable");
6869 fprintf(stderr, " none");
6870 fprintf(stderr, "\n");
6872 if (obj->isDenseArray()) {
6873 unsigned slots = JS_MIN(obj->getArrayLength(), obj->getDenseArrayCapacity());
6874 fprintf(stderr, "elements\n");
6875 for (unsigned i = 0; i < slots; i++) {
6876 fprintf(stderr, " %3d: ", i);
6877 dumpValue(obj->getDenseArrayElement(i));
6878 fprintf(stderr, "\n");
6884 fprintf(stderr, "proto ");
6885 dumpValue(ObjectOrNullValue(obj->getProto()));
6886 fputc('\n', stderr);
6888 fprintf(stderr, "parent ");
6889 dumpValue(ObjectOrNullValue(obj->getParent()));
6890 fputc('\n', stderr);
6892 if (clasp->flags & JSCLASS_HAS_PRIVATE)
6893 fprintf(stderr, "private %p\n", obj->getPrivate());
6895 if (!obj->isNative())
6896 fprintf(stderr, "not native\n");
6898 unsigned reservedEnd = JSCLASS_RESERVED_SLOTS(clasp);
6899 unsigned slots = obj->slotSpan();
6900 unsigned stop = obj->isNative() ? reservedEnd : slots;
6902 fprintf(stderr, obj->isNative() ? "reserved slots:\n" : "slots:\n");
6903 for (unsigned i = 0; i < stop; i++) {
6904 fprintf(stderr, " %3d ", i);
6905 if (i < reservedEnd)
6906 fprintf(stderr, "(reserved) ");
6907 fprintf(stderr, "= ");
6908 dumpValue(obj->getSlot(i));
6909 fputc('\n', stderr);
6912 if (obj->isNative()) {
6913 fprintf(stderr, "properties:\n");
6914 Vector<const Shape *, 8, SystemAllocPolicy> props;
6915 for (Shape::Range r = obj->lastProperty()->all(); !r.empty(); r.popFront())
6916 props.append(&r.front());
6917 for (size_t i = props.length(); i-- != 0;)
6918 DumpProperty(obj, *props[i]);
6920 fputc('\n', stderr);
6924 MaybeDumpObject(const char *name, JSObject *obj)
6927 fprintf(stderr, " %s: ", name);
6928 dumpValue(ObjectValue(*obj));
6929 fputc('\n', stderr);
6934 MaybeDumpValue(const char *name, const Value &v)
6937 fprintf(stderr, " %s: ", name);
6939 fputc('\n', stderr);
6944 js_DumpStackFrame(JSContext *cx, JSStackFrame *start)
6946 /* This should only called during live debugging. */
6947 VOUCH_DOES_NOT_REQUIRE_STACK();
6950 start = cx->maybefp();
6951 FrameRegsIter i(cx);
6952 while (!i.done() && i.fp() != start)
6956 fprintf(stderr, "fp = %p not found in cx = %p\n", (void *)start, (void *)cx);
6960 for (; !i.done(); ++i) {
6961 JSStackFrame *const fp = i.fp();
6963 fprintf(stderr, "JSStackFrame at %p\n", (void *) fp);
6964 if (fp->isFunctionFrame()) {
6965 fprintf(stderr, "callee fun: ");
6966 dumpValue(ObjectValue(fp->callee()));
6968 fprintf(stderr, "global frame, no callee");
6970 fputc('\n', stderr);
6972 if (fp->isScriptFrame()) {
6973 fprintf(stderr, "file %s line %u\n",
6974 fp->script()->filename, (unsigned) fp->script()->lineno);
6977 if (jsbytecode *pc = i.pc()) {
6978 if (!fp->isScriptFrame()) {
6979 fprintf(stderr, "*** pc && !script, skipping frame\n\n");
6982 if (fp->hasImacropc()) {
6983 fprintf(stderr, " pc in imacro at %p\n called from ", pc);
6984 pc = fp->imacropc();
6986 fprintf(stderr, " ");
6988 fprintf(stderr, "pc = %p\n", pc);
6989 fprintf(stderr, " current op: %s\n", js_CodeName[*pc]);
6992 fprintf(stderr, " slots: %p\n", (void *) fp->slots());
6993 fprintf(stderr, " sp: %p = slots + %u\n", (void *) sp, (unsigned) (sp - fp->slots()));
6994 if (sp - fp->slots() < 10000) { // sanity
6995 for (Value *p = fp->slots(); p < sp; p++) {
6996 fprintf(stderr, " %p: ", (void *) p);
6998 fputc('\n', stderr);
7001 if (fp->isFunctionFrame() && !fp->isEvalFrame()) {
7002 fprintf(stderr, " actuals: %p (%u) ", (void *) fp->actualArgs(), (unsigned) fp->numActualArgs());
7003 fprintf(stderr, " formals: %p (%u)\n", (void *) fp->formalArgs(), (unsigned) fp->numFormalArgs());
7005 MaybeDumpObject("callobj", fp->maybeCallObj());
7006 MaybeDumpObject("argsobj", fp->maybeArgsObj());
7007 if (!fp->isDummyFrame()) {
7008 MaybeDumpValue("this", fp->thisValue());
7009 fprintf(stderr, " rval: ");
7010 dumpValue(fp->returnValue());
7012 fprintf(stderr, "dummy frame");
7014 fputc('\n', stderr);
7016 fprintf(stderr, " flags:");
7017 if (fp->isConstructing())
7018 fprintf(stderr, " constructing");
7019 if (fp->hasOverriddenArgs())
7020 fprintf(stderr, " overridden_args");
7021 if (fp->isAssigning())
7022 fprintf(stderr, " assigning");
7023 if (fp->isDebuggerFrame())
7024 fprintf(stderr, " debugger");
7025 if (fp->isEvalFrame())
7026 fprintf(stderr, " eval");
7027 if (fp->isYielding())
7028 fprintf(stderr, " yielding");
7029 if (fp->isGeneratorFrame())
7030 fprintf(stderr, " generator");
7031 fputc('\n', stderr);
7033 fprintf(stderr, " scopeChain: (JSObject *) %p\n", (void *) &fp->scopeChain());
7035 fputc('\n', stderr);