*** /dev/null Mon Apr 29 07:15:37 2024
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*** 0 ****
--- 1,4426 ----
+ /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sw=4 et tw=80:
+ *
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Communicator client code, released
+ * March 31, 1998.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+ /*
+ * JS object implementation.
+ */
+ #include "jsstddef.h"
+ #include <stdlib.h>
+ #include <string.h>
+ #include "jstypes.h"
+ #include "jsarena.h" /* Added by JSIFY */
+ #include "jsutil.h" /* Added by JSIFY */
+ #include "jshash.h" /* Added by JSIFY */
+ #include "jsdhash.h"
+ #include "jsprf.h"
+ #include "jsapi.h"
+ #include "jsarray.h"
+ #include "jsatom.h"
+ #include "jsbool.h"
+ #include "jscntxt.h"
+ #include "jsconfig.h"
+ #include "jsfun.h"
+ #include "jsgc.h"
+ #include "jsinterp.h"
+ #include "jslock.h"
+ #include "jsnum.h"
+ #include "jsobj.h"
+ #include "jsscope.h"
+ #include "jsscript.h"
+ #include "jsstr.h"
+ #include "jsopcode.h"
+
+ #include "jsdbgapi.h" /* whether or not JS_HAS_OBJ_WATCHPOINT */
+
+ #ifdef JS_THREADSAFE
+ #define NATIVE_DROP_PROPERTY js_DropProperty
+
+ extern void
+ js_DropProperty(JSContext *cx, JSObject *obj, JSProperty *prop);
+ #else
+ #define NATIVE_DROP_PROPERTY NULL
+ #endif
+
+ JS_FRIEND_DATA(JSObjectOps) js_ObjectOps = {
+ js_NewObjectMap, js_DestroyObjectMap,
+ js_LookupProperty, js_DefineProperty,
+ js_GetProperty, js_SetProperty,
+ js_GetAttributes, js_SetAttributes,
+ js_DeleteProperty, js_DefaultValue,
+ js_Enumerate, js_CheckAccess,
+ NULL, NATIVE_DROP_PROPERTY,
+ js_Call, js_Construct,
+ NULL, js_HasInstance,
+ js_SetProtoOrParent, js_SetProtoOrParent,
+ js_Mark, js_Clear,
+ js_GetRequiredSlot, js_SetRequiredSlot
+ };
+
+ JSClass js_ObjectClass = {
+ js_Object_str,
+ 0,
+ JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
+ JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, JS_FinalizeStub,
+ JSCLASS_NO_OPTIONAL_MEMBERS
+ };
+
+ #if JS_HAS_OBJ_PROTO_PROP
+
+ static JSBool
+ obj_getSlot(JSContext *cx, JSObject *obj, jsval id, jsval *vp);
+
+ static JSBool
+ obj_setSlot(JSContext *cx, JSObject *obj, jsval id, jsval *vp);
+
+ static JSBool
+ obj_getCount(JSContext *cx, JSObject *obj, jsval id, jsval *vp);
+
+ static JSPropertySpec object_props[] = {
+ /* These two must come first; see object_props[slot].name usage below. */
+ {js_proto_str, JSSLOT_PROTO, JSPROP_PERMANENT|JSPROP_SHARED,
+ obj_getSlot, obj_setSlot},
+ {js_parent_str,JSSLOT_PARENT,JSPROP_READONLY|JSPROP_PERMANENT|JSPROP_SHARED,
+ obj_getSlot, obj_setSlot},
+ {js_count_str, 0, JSPROP_PERMANENT,obj_getCount, obj_getCount},
+ {0,0,0,0,0}
+ };
+
+ /* NB: JSSLOT_PROTO and JSSLOT_PARENT are already indexes into object_props. */
+ #define JSSLOT_COUNT 2
+
+ static JSBool
+ ReportStrictSlot(JSContext *cx, uint32 slot)
+ {
+ if (slot == JSSLOT_PROTO)
+ return JS_TRUE;
+ return JS_ReportErrorFlagsAndNumber(cx,
+ JSREPORT_WARNING | JSREPORT_STRICT,
+ js_GetErrorMessage, NULL,
+ JSMSG_DEPRECATED_USAGE,
+ object_props[slot].name);
+ }
+
+ static JSBool
+ obj_getSlot(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
+ {
+ uint32 slot;
+ jsid propid;
+ JSAccessMode mode;
+ uintN attrs;
+ JSObject *pobj;
+ JSClass *clasp;
+ JSExtendedClass *xclasp;
+
+ slot = (uint32) JSVAL_TO_INT(id);
+ if (id == INT_TO_JSVAL(JSSLOT_PROTO)) {
+ propid = ATOM_TO_JSID(cx->runtime->atomState.protoAtom);
+ mode = JSACC_PROTO;
+ } else {
+ propid = ATOM_TO_JSID(cx->runtime->atomState.parentAtom);
+ mode = JSACC_PARENT;
+ }
+
+ /* Let OBJ_CHECK_ACCESS get the slot's value, based on the access mode. */
+ if (!OBJ_CHECK_ACCESS(cx, obj, propid, mode, vp, &attrs))
+ return JS_FALSE;
+
+ pobj = JSVAL_TO_OBJECT(*vp);
+ if (pobj) {
+ clasp = OBJ_GET_CLASS(cx, pobj);
+ if (clasp->flags & JSCLASS_IS_EXTENDED) {
+ xclasp = (JSExtendedClass *) clasp;
+ if (xclasp->outerObject) {
+ pobj = xclasp->outerObject(cx, pobj);
+ if (!pobj)
+ return JS_FALSE;
+ *vp = OBJECT_TO_JSVAL(pobj);
+ }
+ }
+ }
+ return JS_TRUE;
+ }
+
+ static JSBool
+ obj_setSlot(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
+ {
+ JSObject *pobj;
+ uint32 slot;
+ jsid propid;
+ uintN attrs;
+
+ if (!JSVAL_IS_OBJECT(*vp))
+ return JS_TRUE;
+ pobj = JSVAL_TO_OBJECT(*vp);
+ slot = (uint32) JSVAL_TO_INT(id);
+ if (JS_HAS_STRICT_OPTION(cx) && !ReportStrictSlot(cx, slot))
+ return JS_FALSE;
+
+ /* __parent__ is readonly and permanent, only __proto__ may be set. */
+ propid = ATOM_TO_JSID(cx->runtime->atomState.protoAtom);
+ if (!OBJ_CHECK_ACCESS(cx, obj, propid, JSACC_PROTO|JSACC_WRITE, vp, &attrs))
+ return JS_FALSE;
+
+ return js_SetProtoOrParent(cx, obj, slot, pobj);
+ }
+
+ static JSBool
+ obj_getCount(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
+ {
+ jsval iter_state;
+ jsid num_properties;
+ JSBool ok;
+
+ if (JS_HAS_STRICT_OPTION(cx) && !ReportStrictSlot(cx, JSSLOT_COUNT))
+ return JS_FALSE;
+
+ /* Get the number of properties to enumerate. */
+ iter_state = JSVAL_NULL;
+ ok = OBJ_ENUMERATE(cx, obj, JSENUMERATE_INIT, &iter_state, &num_properties);
+ if (!ok)
+ goto out;
+
+ if (!JSVAL_IS_INT(num_properties)) {
+ JS_ASSERT(0);
+ *vp = JSVAL_ZERO;
+ goto out;
+ }
+ *vp = num_properties;
+
+ out:
+ if (iter_state != JSVAL_NULL)
+ ok = OBJ_ENUMERATE(cx, obj, JSENUMERATE_DESTROY, &iter_state, 0);
+ return ok;
+ }
+
+ #else /* !JS_HAS_OBJ_PROTO_PROP */
+
+ #define object_props NULL
+
+ #endif /* !JS_HAS_OBJ_PROTO_PROP */
+
+ JSBool
+ js_SetProtoOrParent(JSContext *cx, JSObject *obj, uint32 slot, JSObject *pobj)
+ {
+ JSRuntime *rt;
+ JSObject *obj2, *oldproto;
+ JSScope *scope, *newscope;
+
+ /*
+ * Serialize all proto and parent setting in order to detect cycles.
+ * We nest locks in this function, and only here, in the following orders:
+ *
+ * (1) rt->setSlotLock < pobj's scope lock;
+ * rt->setSlotLock < pobj's proto-or-parent's scope lock;
+ * rt->setSlotLock < pobj's grand-proto-or-parent's scope lock;
+ * etc...
+ * (2) rt->setSlotLock < obj's scope lock < pobj's scope lock.
+ *
+ * We avoid AB-BA deadlock by restricting obj from being on pobj's parent
+ * or proto chain (pobj may already be on obj's parent or proto chain; it
+ * could be moving up or down). We finally order obj with respect to pobj
+ * at the bottom of this routine (just before releasing rt->setSlotLock),
+ * by making pobj be obj's prototype or parent.
+ *
+ * After we have set the slot and released rt->setSlotLock, another call
+ * to js_SetProtoOrParent could nest locks according to the first order
+ * list above, but it cannot deadlock with any other thread. For there
+ * to be a deadlock, other parts of the engine would have to nest scope
+ * locks in the opposite order. XXXbe ensure they don't!
+ */
+ rt = cx->runtime;
+ #ifdef JS_THREADSAFE
+
+ JS_ACQUIRE_LOCK(rt->setSlotLock);
+ while (rt->setSlotBusy) {
+ jsrefcount saveDepth;
+
+ /* Take pains to avoid nesting rt->gcLock inside rt->setSlotLock! */
+ JS_RELEASE_LOCK(rt->setSlotLock);
+ saveDepth = JS_SuspendRequest(cx);
+ JS_ACQUIRE_LOCK(rt->setSlotLock);
+ if (rt->setSlotBusy)
+ JS_WAIT_CONDVAR(rt->setSlotDone, JS_NO_TIMEOUT);
+ JS_RELEASE_LOCK(rt->setSlotLock);
+ JS_ResumeRequest(cx, saveDepth);
+ JS_ACQUIRE_LOCK(rt->setSlotLock);
+ }
+ rt->setSlotBusy = JS_TRUE;
+ JS_RELEASE_LOCK(rt->setSlotLock);
+
+ #define SET_SLOT_DONE(rt) \
+ JS_BEGIN_MACRO \
+ JS_ACQUIRE_LOCK((rt)->setSlotLock); \
+ (rt)->setSlotBusy = JS_FALSE; \
+ JS_NOTIFY_ALL_CONDVAR((rt)->setSlotDone); \
+ JS_RELEASE_LOCK((rt)->setSlotLock); \
+ JS_END_MACRO
+
+ #else
+
+ #define SET_SLOT_DONE(rt) /* nothing */
+
+ #endif
+
+ obj2 = pobj;
+ while (obj2) {
+ if (obj2 == obj) {
+ SET_SLOT_DONE(rt);
+ JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
+ JSMSG_CYCLIC_VALUE,
+ #if JS_HAS_OBJ_PROTO_PROP
+ object_props[slot].name
+ #else
+ (slot == JSSLOT_PROTO) ? js_proto_str
+ : js_parent_str
+ #endif
+ );
+ return JS_FALSE;
+ }
+ obj2 = JSVAL_TO_OBJECT(OBJ_GET_SLOT(cx, obj2, slot));
+ }
+
+ if (slot == JSSLOT_PROTO && OBJ_IS_NATIVE(obj)) {
+ /* Check to see whether obj shares its prototype's scope. */
+ JS_LOCK_OBJ(cx, obj);
+ scope = OBJ_SCOPE(obj);
+ oldproto = JSVAL_TO_OBJECT(LOCKED_OBJ_GET_SLOT(obj, JSSLOT_PROTO));
+ if (oldproto && OBJ_SCOPE(oldproto) == scope) {
+ /* Either obj needs a new empty scope, or it should share pobj's. */
+ if (!pobj ||
+ !OBJ_IS_NATIVE(pobj) ||
+ OBJ_GET_CLASS(cx, pobj) != LOCKED_OBJ_GET_CLASS(oldproto)) {
+ /*
+ * With no proto and no scope of its own, obj is truly empty.
+ *
+ * If pobj is not native, obj needs its own empty scope -- it
+ * should not continue to share oldproto's scope once oldproto
+ * is not on obj's prototype chain. That would put properties
+ * from oldproto's scope ahead of properties defined by pobj,
+ * in lookup order.
+ *
+ * If pobj's class differs from oldproto's, we may need a new
+ * scope to handle differences in private and reserved slots,
+ * so we suboptimally but safely make one.
+ */
+ scope = js_GetMutableScope(cx, obj);
+ if (!scope) {
+ JS_UNLOCK_OBJ(cx, obj);
+ SET_SLOT_DONE(rt);
+ return JS_FALSE;
+ }
+ } else if (OBJ_SCOPE(pobj) != scope) {
+ #ifdef JS_THREADSAFE
+ /*
+ * We are about to nest scope locks. Help jslock.c:ShareScope
+ * keep scope->u.count balanced for the JS_UNLOCK_SCOPE, while
+ * avoiding deadlock, by recording scope in rt->setSlotScope.
+ */
+ if (scope->ownercx) {
+ JS_ASSERT(scope->ownercx == cx);
+ rt->setSlotScope = scope;
+ }
+ #endif
+
+ /* We can't deadlock because we checked for cycles above (2). */
+ JS_LOCK_OBJ(cx, pobj);
+ newscope = (JSScope *) js_HoldObjectMap(cx, pobj->map);
+ obj->map = &newscope->map;
+ js_DropObjectMap(cx, &scope->map, obj);
+ JS_TRANSFER_SCOPE_LOCK(cx, scope, newscope);
+ scope = newscope;
+ #ifdef JS_THREADSAFE
+ rt->setSlotScope = NULL;
+ #endif
+ }
+ }
+ LOCKED_OBJ_SET_SLOT(obj, JSSLOT_PROTO, OBJECT_TO_JSVAL(pobj));
+ JS_UNLOCK_SCOPE(cx, scope);
+ } else {
+ OBJ_SET_SLOT(cx, obj, slot, OBJECT_TO_JSVAL(pobj));
+ }
+
+ SET_SLOT_DONE(rt);
+ return JS_TRUE;
+
+ #undef SET_SLOT_DONE
+ }
+
+ JS_STATIC_DLL_CALLBACK(JSHashNumber)
+ js_hash_object(const void *key)
+ {
+ return (JSHashNumber)JS_PTR_TO_UINT32(key) >> JSVAL_TAGBITS;
+ }
+
+ static JSHashEntry *
+ MarkSharpObjects(JSContext *cx, JSObject *obj, JSIdArray **idap)
+ {
+ JSSharpObjectMap *map;
+ JSHashTable *table;
+ JSHashNumber hash;
+ JSHashEntry **hep, *he;
+ jsatomid sharpid;
+ JSIdArray *ida;
+ JSBool ok;
+ jsint i, length;
+ jsid id;
+ #if JS_HAS_GETTER_SETTER
+ JSObject *obj2;
+ JSProperty *prop;
+ uintN attrs;
+ #endif
+ jsval val;
+ int stackDummy;
+
+ if (!JS_CHECK_STACK_SIZE(cx, stackDummy)) {
+ JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_OVER_RECURSED);
+ return NULL;
+ }
+
+ map = &cx->sharpObjectMap;
+ table = map->table;
+ hash = js_hash_object(obj);
+ hep = JS_HashTableRawLookup(table, hash, obj);
+ he = *hep;
+ if (!he) {
+ sharpid = 0;
+ he = JS_HashTableRawAdd(table, hep, hash, obj,
+ JS_UINT32_TO_PTR(sharpid));
+ if (!he) {
+ JS_ReportOutOfMemory(cx);
+ return NULL;
+ }
+
+ /*
+ * Increment map->depth to protect js_EnterSharpObject from reentering
+ * itself badly. Without this fix, if we reenter the basis case where
+ * map->depth == 0, when unwinding the inner call we will destroy the
+ * newly-created hash table and crash.
+ */
+ ++map->depth;
+ ida = JS_Enumerate(cx, obj);
+ --map->depth;
+ if (!ida)
+ return NULL;
+
+ ok = JS_TRUE;
+ for (i = 0, length = ida->length; i < length; i++) {
+ id = ida->vector[i];
+ #if JS_HAS_GETTER_SETTER
+ ok = OBJ_LOOKUP_PROPERTY(cx, obj, id, &obj2, &prop);
+ if (!ok)
+ break;
+ if (!prop)
+ continue;
+ ok = OBJ_GET_ATTRIBUTES(cx, obj2, id, prop, &attrs);
+ if (ok) {
+ if (OBJ_IS_NATIVE(obj2) &&
+ (attrs & (JSPROP_GETTER | JSPROP_SETTER))) {
+ val = JSVAL_NULL;
+ if (attrs & JSPROP_GETTER)
+ val = (jsval) ((JSScopeProperty*)prop)->getter;
+ if (attrs & JSPROP_SETTER) {
+ if (val != JSVAL_NULL) {
+ /* Mark the getter, then set val to setter. */
+ ok = (MarkSharpObjects(cx, JSVAL_TO_OBJECT(val),
+ NULL)
+ != NULL);
+ }
+ val = (jsval) ((JSScopeProperty*)prop)->setter;
+ }
+ } else {
+ ok = OBJ_GET_PROPERTY(cx, obj, id, &val);
+ }
+ }
+ OBJ_DROP_PROPERTY(cx, obj2, prop);
+ #else
+ ok = OBJ_GET_PROPERTY(cx, obj, id, &val);
+ #endif
+ if (!ok)
+ break;
+ if (!JSVAL_IS_PRIMITIVE(val) &&
+ !MarkSharpObjects(cx, JSVAL_TO_OBJECT(val), NULL)) {
+ ok = JS_FALSE;
+ break;
+ }
+ }
+ if (!ok || !idap)
+ JS_DestroyIdArray(cx, ida);
+ if (!ok)
+ return NULL;
+ } else {
+ sharpid = JS_PTR_TO_UINT32(he->value);
+ if (sharpid == 0) {
+ sharpid = ++map->sharpgen << SHARP_ID_SHIFT;
+ he->value = JS_UINT32_TO_PTR(sharpid);
+ }
+ ida = NULL;
+ }
+ if (idap)
+ *idap = ida;
+ return he;
+ }
+
+ JSHashEntry *
+ js_EnterSharpObject(JSContext *cx, JSObject *obj, JSIdArray **idap,
+ jschar **sp)
+ {
+ JSSharpObjectMap *map;
+ JSHashTable *table;
+ JSIdArray *ida;
+ JSHashNumber hash;
+ JSHashEntry *he, **hep;
+ jsatomid sharpid;
+ char buf[20];
+ size_t len;
+
+ if (JS_HAS_NATIVE_BRANCH_CALLBACK_OPTION(cx) &&
+ cx->branchCallback &&
+ !cx->branchCallback(cx, NULL)) {
+ return NULL;
+ }
+
+ /* Set to null in case we return an early error. */
+ *sp = NULL;
+ map = &cx->sharpObjectMap;
+ table = map->table;
+ if (!table) {
+ table = JS_NewHashTable(8, js_hash_object, JS_CompareValues,
+ JS_CompareValues, NULL, NULL);
+ if (!table) {
+ JS_ReportOutOfMemory(cx);
+ return NULL;
+ }
+ map->table = table;
+ }
+
+ ida = NULL;
+ if (map->depth == 0) {
+ he = MarkSharpObjects(cx, obj, &ida);
+ if (!he)
+ goto bad;
+ JS_ASSERT((JS_PTR_TO_UINT32(he->value) & SHARP_BIT) == 0);
+ if (!idap) {
+ JS_DestroyIdArray(cx, ida);
+ ida = NULL;
+ }
+ } else {
+ hash = js_hash_object(obj);
+ hep = JS_HashTableRawLookup(table, hash, obj);
+ he = *hep;
+
+ /*
+ * It's possible that the value of a property has changed from the
+ * first time the object's properties are traversed (when the property
+ * ids are entered into the hash table) to the second (when they are
+ * converted to strings), i.e., the OBJ_GET_PROPERTY() call is not
+ * idempotent.
+ */
+ if (!he) {
+ he = JS_HashTableRawAdd(table, hep, hash, obj, NULL);
+ if (!he) {
+ JS_ReportOutOfMemory(cx);
+ goto bad;
+ }
+ sharpid = 0;
+ goto out;
+ }
+ }
+
+ sharpid = JS_PTR_TO_UINT32(he->value);
+ if (sharpid != 0) {
+ len = JS_snprintf(buf, sizeof buf, "#%u%c",
+ sharpid >> SHARP_ID_SHIFT,
+ (sharpid & SHARP_BIT) ? '#' : '=');
+ *sp = js_InflateString(cx, buf, &len);
+ if (!*sp) {
+ if (ida)
+ JS_DestroyIdArray(cx, ida);
+ goto bad;
+ }
+ }
+
+ out:
+ JS_ASSERT(he);
+ if ((sharpid & SHARP_BIT) == 0) {
+ if (idap && !ida) {
+ ida = JS_Enumerate(cx, obj);
+ if (!ida) {
+ if (*sp) {
+ JS_free(cx, *sp);
+ *sp = NULL;
+ }
+ goto bad;
+ }
+ }
+ map->depth++;
+ }
+
+ if (idap)
+ *idap = ida;
+ return he;
+
+ bad:
+ /* Clean up the sharpObjectMap table on outermost error. */
+ if (map->depth == 0) {
+ map->sharpgen = 0;
+ JS_HashTableDestroy(map->table);
+ map->table = NULL;
+ }
+ return NULL;
+ }
+
+ void
+ js_LeaveSharpObject(JSContext *cx, JSIdArray **idap)
+ {
+ JSSharpObjectMap *map;
+ JSIdArray *ida;
+
+ map = &cx->sharpObjectMap;
+ JS_ASSERT(map->depth > 0);
+ if (--map->depth == 0) {
+ map->sharpgen = 0;
+ JS_HashTableDestroy(map->table);
+ map->table = NULL;
+ }
+ if (idap) {
+ ida = *idap;
+ if (ida) {
+ JS_DestroyIdArray(cx, ida);
+ *idap = NULL;
+ }
+ }
+ }
+
+ #define OBJ_TOSTRING_EXTRA 4 /* for 4 local GC roots */
+
+ #if JS_HAS_INITIALIZERS || JS_HAS_TOSOURCE
+ JSBool
+ js_obj_toSource(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
+ jsval *rval)
+ {
+ JSBool ok, outermost;
+ JSHashEntry *he;
+ JSIdArray *ida;
+ jschar *chars, *ochars, *vsharp;
+ const jschar *idstrchars, *vchars;
+ size_t nchars, idstrlength, gsoplength, vlength, vsharplength;
+ char *comma;
+ jsint i, j, length, valcnt;
+ jsid id;
+ #if JS_HAS_GETTER_SETTER
+ JSObject *obj2;
+ JSProperty *prop;
+ uintN attrs;
+ #endif
+ jsval *val;
+ JSString *gsop[2];
+ JSAtom *atom;
+ JSString *idstr, *valstr, *str;
+ int stackDummy;
+
+ if (!JS_CHECK_STACK_SIZE(cx, stackDummy)) {
+ JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_OVER_RECURSED);
+ return JS_FALSE;
+ }
+
+ /*
+ * obj_toString for 1.2 calls toSource, and doesn't want the extra parens
+ * on the outside.
+ */
+ outermost = !JS_VERSION_IS_1_2(cx) && cx->sharpObjectMap.depth == 0;
+ he = js_EnterSharpObject(cx, obj, &ida, &chars);
+ if (!he)
+ return JS_FALSE;
+ if (IS_SHARP(he)) {
+ /*
+ * We didn't enter -- obj is already "sharp", meaning we've visited it
+ * already in our depth first search, and therefore chars contains a
+ * string of the form "#n#".
+ */
+ JS_ASSERT(!ida);
+ #if JS_HAS_SHARP_VARS
+ nchars = js_strlen(chars);
+ #else
+ chars[0] = '{';
+ chars[1] = '}';
+ chars[2] = 0;
+ nchars = 2;
+ #endif
+ goto make_string;
+ }
+ JS_ASSERT(ida);
+ ok = JS_TRUE;
+
+ if (!chars) {
+ /* If outermost, allocate 4 + 1 for "({})" and the terminator. */
+ chars = (jschar *) malloc(((outermost ? 4 : 2) + 1) * sizeof(jschar));
+ nchars = 0;
+ if (!chars)
+ goto error;
+ if (outermost)
+ chars[nchars++] = '(';
+ } else {
+ /* js_EnterSharpObject returned a string of the form "#n=" in chars. */
+ MAKE_SHARP(he);
+ nchars = js_strlen(chars);
+ chars = (jschar *)
+ realloc((ochars = chars), (nchars + 2 + 1) * sizeof(jschar));
+ if (!chars) {
+ free(ochars);
+ goto error;
+ }
+ if (outermost) {
+ /*
+ * No need for parentheses around the whole shebang, because #n=
+ * unambiguously begins an object initializer, and never a block
+ * statement.
+ */
+ outermost = JS_FALSE;
+ }
+ }
+
+ #ifdef DUMP_CALL_TABLE
+ if (cx->options & JSOPTION_LOGCALL_TOSOURCE) {
+ const char *classname = OBJ_GET_CLASS(cx, obj)->name;
+ size_t classnchars = strlen(classname);
+ static const char classpropid[] = "C";
+ const char *cp;
+ size_t onchars = nchars;
+
+ /* 2 for ': ', 2 quotes around classname, 2 for ', ' after. */
+ classnchars += sizeof classpropid - 1 + 2 + 2;
+ if (ida->length)
+ classnchars += 2;
+
+ /* 2 for the braces, 1 for the terminator */
+ chars = (jschar *)
+ realloc((ochars = chars),
+ (nchars + classnchars + 2 + 1) * sizeof(jschar));
+ if (!chars) {
+ free(ochars);
+ goto error;
+ }
+
+ chars[nchars++] = '{'; /* 1 from the 2 braces */
+ for (cp = classpropid; *cp; cp++)
+ chars[nchars++] = (jschar) *cp;
+ chars[nchars++] = ':';
+ chars[nchars++] = ' '; /* 2 for ': ' */
+ chars[nchars++] = '"';
+ for (cp = classname; *cp; cp++)
+ chars[nchars++] = (jschar) *cp;
+ chars[nchars++] = '"'; /* 2 quotes */
+ if (ida->length) {
+ chars[nchars++] = ',';
+ chars[nchars++] = ' '; /* 2 for ', ' */
+ }
+
+ JS_ASSERT(nchars - onchars == 1 + classnchars);
+ } else
+ #endif
+ chars[nchars++] = '{';
+
+ comma = NULL;
+
+ /*
+ * We have four local roots for cooked and raw value GC safety. Hoist the
+ * "argv + 2" out of the loop using the val local, which refers to the raw
+ * (unconverted, "uncooked") values.
+ */
+ val = argv + 2;
+
+ for (i = 0, length = ida->length; i < length; i++) {
+ /* Get strings for id and value and GC-root them via argv. */
+ id = ida->vector[i];
+
+ #if JS_HAS_GETTER_SETTER
+
+ ok = OBJ_LOOKUP_PROPERTY(cx, obj, id, &obj2, &prop);
+ if (!ok)
+ goto error;
+ valcnt = 0;
+ if (prop) {
+ ok = OBJ_GET_ATTRIBUTES(cx, obj2, id, prop, &attrs);
+ if (!ok) {
+ OBJ_DROP_PROPERTY(cx, obj2, prop);
+ goto error;
+ }
+ if (OBJ_IS_NATIVE(obj2) &&
+ (attrs & (JSPROP_GETTER | JSPROP_SETTER))) {
+ if (attrs & JSPROP_GETTER) {
+ val[valcnt] = (jsval) ((JSScopeProperty *)prop)->getter;
+ #ifdef OLD_GETTER_SETTER
+ gsop[valcnt] =
+ ATOM_TO_STRING(cx->runtime->atomState.getterAtom);
+ #else
+ gsop[valcnt] =
+ ATOM_TO_STRING(cx->runtime->atomState.getAtom);
+ #endif
+ valcnt++;
+ }
+ if (attrs & JSPROP_SETTER) {
+ val[valcnt] = (jsval) ((JSScopeProperty *)prop)->setter;
+ #ifdef OLD_GETTER_SETTER
+ gsop[valcnt] =
+ ATOM_TO_STRING(cx->runtime->atomState.setterAtom);
+ #else
+ gsop[valcnt] =
+ ATOM_TO_STRING(cx->runtime->atomState.setAtom);
+ #endif
+ valcnt++;
+ }
+ } else {
+ valcnt = 1;
+ gsop[0] = NULL;
+ ok = OBJ_GET_PROPERTY(cx, obj, id, &val[0]);
+ }
+ OBJ_DROP_PROPERTY(cx, obj2, prop);
+ }
+
+ #else /* !JS_HAS_GETTER_SETTER */
+
+ valcnt = 1;
+ gsop[0] = NULL;
+ ok = OBJ_GET_PROPERTY(cx, obj, id, &val[0]);
+
+ #endif /* !JS_HAS_GETTER_SETTER */
+
+ if (!ok)
+ goto error;
+
+ /* Convert id to a jsval and then to a string. */
+ atom = JSID_IS_ATOM(id) ? JSID_TO_ATOM(id) : NULL;
+ id = ID_TO_VALUE(id);
+ idstr = js_ValueToString(cx, id);
+ if (!idstr) {
+ ok = JS_FALSE;
+ goto error;
+ }
+ *rval = STRING_TO_JSVAL(idstr); /* local root */
+
+ /*
+ * If id is a string that's a reserved identifier, or else id is not
+ * an identifier at all, then it needs to be quoted. Also, negative
+ * integer ids must be quoted.
+ */
+ if (atom
+ ? (ATOM_KEYWORD(atom) || !js_IsIdentifier(idstr))
+ : (JSID_IS_OBJECT(id) || JSID_TO_INT(id) < 0)) {
+ idstr = js_QuoteString(cx, idstr, (jschar)'\'');
+ if (!idstr) {
+ ok = JS_FALSE;
+ goto error;
+ }
+ *rval = STRING_TO_JSVAL(idstr); /* local root */
+ }
+ idstrchars = JSSTRING_CHARS(idstr);
+ idstrlength = JSSTRING_LENGTH(idstr);
+
+ for (j = 0; j < valcnt; j++) {
+ /* Convert val[j] to its canonical source form. */
+ valstr = js_ValueToSource(cx, val[j]);
+ if (!valstr) {
+ ok = JS_FALSE;
+ goto error;
+ }
+ argv[j] = STRING_TO_JSVAL(valstr); /* local root */
+ vchars = JSSTRING_CHARS(valstr);
+ vlength = JSSTRING_LENGTH(valstr);
+
+ #ifndef OLD_GETTER_SETTER
+ /*
+ * Remove '(function ' from the beginning of valstr and ')' from the
+ * end so that we can put "get" in front of the function definition.
+ */
+ if (gsop[j]) {
+ int n = strlen(js_function_str) + 2;
+ vchars += n;
+ vlength -= n + 1;
+ }
+ #endif
+
+ /* If val[j] is a non-sharp object, consider sharpening it. */
+ vsharp = NULL;
+ vsharplength = 0;
+ #if JS_HAS_SHARP_VARS
+ if (!JSVAL_IS_PRIMITIVE(val[j]) && vchars[0] != '#') {
+ he = js_EnterSharpObject(cx, JSVAL_TO_OBJECT(val[j]), NULL,
+ &vsharp);
+ if (!he) {
+ ok = JS_FALSE;
+ goto error;
+ }
+ if (IS_SHARP(he)) {
+ vchars = vsharp;
+ vlength = js_strlen(vchars);
+ } else {
+ if (vsharp) {
+ vsharplength = js_strlen(vsharp);
+ MAKE_SHARP(he);
+ }
+ js_LeaveSharpObject(cx, NULL);
+ }
+ }
+ #endif
+
+ /* Allocate 1 + 1 at end for closing brace and terminating 0. */
+ chars = (jschar *)
+ realloc((ochars = chars),
+ (nchars + (comma ? 2 : 0) +
+ idstrlength + 1 +
+ (gsop[j] ? 1 + JSSTRING_LENGTH(gsop[j]) : 0) +
+ vsharplength + vlength +
+ (outermost ? 2 : 1) + 1) * sizeof(jschar));
+ if (!chars) {
+ /* Save code space on error: let JS_free ignore null vsharp. */
+ JS_free(cx, vsharp);
+ free(ochars);
+ goto error;
+ }
+
+ if (comma) {
+ chars[nchars++] = comma[0];
+ chars[nchars++] = comma[1];
+ }
+ comma = ", ";
+
+ #ifdef OLD_GETTER_SETTER
+ js_strncpy(&chars[nchars], idstrchars, idstrlength);
+ nchars += idstrlength;
+ if (gsop[j]) {
+ chars[nchars++] = ' ';
+ gsoplength = JSSTRING_LENGTH(gsop[j]);
+ js_strncpy(&chars[nchars], JSSTRING_CHARS(gsop[j]), gsoplength);
+ nchars += gsoplength;
+ }
+ chars[nchars++] = ':';
+ #else
+ if (gsop[j]) {
+ gsoplength = JSSTRING_LENGTH(gsop[j]);
+ js_strncpy(&chars[nchars], JSSTRING_CHARS(gsop[j]), gsoplength);
+ nchars += gsoplength;
+ chars[nchars++] = ' ';
+ }
+ js_strncpy(&chars[nchars], idstrchars, idstrlength);
+ nchars += idstrlength;
+ if (!gsop[j])
+ chars[nchars++] = ':';
+ #endif
+ if (vsharplength) {
+ js_strncpy(&chars[nchars], vsharp, vsharplength);
+ nchars += vsharplength;
+ }
+ js_strncpy(&chars[nchars], vchars, vlength);
+ nchars += vlength;
+
+ if (vsharp)
+ JS_free(cx, vsharp);
+ #ifdef DUMP_CALL_TABLE
+ if (outermost && nchars >= js_LogCallToSourceLimit)
+ break;
+ #endif
+ }
+ }
+
+ chars[nchars++] = '}';
+ if (outermost)
+ chars[nchars++] = ')';
+ chars[nchars] = 0;
+
+ error:
+ js_LeaveSharpObject(cx, &ida);
+
+ if (!ok) {
+ if (chars)
+ free(chars);
+ return ok;
+ }
+
+ if (!chars) {
+ JS_ReportOutOfMemory(cx);
+ return JS_FALSE;
+ }
+ make_string:
+ str = js_NewString(cx, chars, nchars, 0);
+ if (!str) {
+ free(chars);
+ return JS_FALSE;
+ }
+ *rval = STRING_TO_JSVAL(str);
+ return JS_TRUE;
+ }
+ #endif /* JS_HAS_INITIALIZERS || JS_HAS_TOSOURCE */
+
+ JSBool
+ js_obj_toString(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
+ jsval *rval)
+ {
+ jschar *chars;
+ size_t nchars;
+ const char *clazz, *prefix;
+ JSString *str;
+
+ #if JS_HAS_INITIALIZERS
+ if (JS_VERSION_IS_1_2(cx))
+ return js_obj_toSource(cx, obj, argc, argv, rval);
+ #endif
+
+ clazz = OBJ_GET_CLASS(cx, obj)->name;
+ nchars = 9 + strlen(clazz); /* 9 for "[object ]" */
+ chars = (jschar *) JS_malloc(cx, (nchars + 1) * sizeof(jschar));
+ if (!chars)
+ return JS_FALSE;
+
+ prefix = "[object ";
+ nchars = 0;
+ while ((chars[nchars] = (jschar)*prefix) != 0)
+ nchars++, prefix++;
+ while ((chars[nchars] = (jschar)*clazz) != 0)
+ nchars++, clazz++;
+ chars[nchars++] = ']';
+ chars[nchars] = 0;
+
+ str = js_NewString(cx, chars, nchars, 0);
+ if (!str) {
+ JS_free(cx, chars);
+ return JS_FALSE;
+ }
+ *rval = STRING_TO_JSVAL(str);
+ return JS_TRUE;
+ }
+
+ static JSBool
+ js_obj_toLocaleString(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
+ jsval *rval)
+ {
+ JSString *str;
+
+ str = js_ValueToString(cx, argv[-1]);
+ if (!str)
+ return JS_FALSE;
+
+ *rval = STRING_TO_JSVAL(str);
+ return JS_TRUE;
+ }
+
+ static JSBool
+ obj_valueOf(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+ {
+ *rval = OBJECT_TO_JSVAL(obj);
+ return JS_TRUE;
+ }
+
+ /*
+ * Check whether principals subsumes scopeobj's principals, and return true
+ * if so (or if scopeobj has no principals, for backward compatibility with
+ * the JS API, which does not require principals), and false otherwise.
+ */
+ JSBool
+ js_CheckPrincipalsAccess(JSContext *cx, JSObject *scopeobj,
+ JSPrincipals *principals, const char *caller)
+ {
+ JSRuntime *rt;
+ JSPrincipals *scopePrincipals;
+
+ rt = cx->runtime;
+ if (rt->findObjectPrincipals) {
+ scopePrincipals = rt->findObjectPrincipals(cx, scopeobj);
+ if (!principals || !scopePrincipals ||
+ !principals->subsume(principals, scopePrincipals)) {
+ JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
+ JSMSG_BAD_INDIRECT_CALL, caller);
+ return JS_FALSE;
+ }
+ }
+ return JS_TRUE;
+ }
+
+ JSObject *
+ js_CheckScopeChainValidity(JSContext *cx, JSObject *scopeobj, const char *caller)
+ {
+ JSClass *clasp;
+ JSExtendedClass *xclasp;
+ JSObject *inner;
+
+ if (!scopeobj)
+ goto bad;
+
+ OBJ_TO_INNER_OBJECT(cx, scopeobj);
+ if (!scopeobj)
+ return NULL;
+
+ inner = scopeobj;
+
+ /* XXX This is an awful gross hack. */
+ while (scopeobj) {
+ clasp = OBJ_GET_CLASS(cx, scopeobj);
+ if (clasp->flags & JSCLASS_IS_EXTENDED) {
+ xclasp = (JSExtendedClass*)clasp;
+ if (xclasp->innerObject &&
+ xclasp->innerObject(cx, scopeobj) != scopeobj) {
+ goto bad;
+ }
+ }
+
+ scopeobj = OBJ_GET_PARENT(cx, scopeobj);
+ }
+
+ return inner;
+
+ bad:
+ JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
+ JSMSG_BAD_INDIRECT_CALL, caller);
+ return NULL;
+ }
+
+ static JSBool
+ obj_eval(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+ {
+ JSStackFrame *fp, *caller;
+ JSBool indirectCall;
+ JSObject *scopeobj;
+ JSString *str;
+ const char *file;
+ uintN line;
+ JSPrincipals *principals;
+ JSScript *script;
+ JSBool ok;
+ #if JS_HAS_EVAL_THIS_SCOPE
+ JSObject *callerScopeChain = NULL, *callerVarObj = NULL;
+ JSBool setCallerScopeChain = JS_FALSE, setCallerVarObj = JS_FALSE;
+ #endif
+
+ fp = cx->fp;
+ caller = JS_GetScriptedCaller(cx, fp);
+ indirectCall = (caller && caller->pc && *caller->pc != JSOP_EVAL);
+
+ if (JS_VERSION_IS_ECMA(cx) &&
+ indirectCall &&
+ !JS_ReportErrorFlagsAndNumber(cx,
+ JSREPORT_WARNING | JSREPORT_STRICT,
+ js_GetErrorMessage, NULL,
+ JSMSG_BAD_INDIRECT_CALL,
+ js_eval_str)) {
+ return JS_FALSE;
+ }
+
+ if (!JSVAL_IS_STRING(argv[0])) {
+ *rval = argv[0];
+ return JS_TRUE;
+ }
+
+ #if JS_HAS_SCRIPT_OBJECT
+ /*
+ * Script.prototype.compile/exec and Object.prototype.eval all take an
+ * optional trailing argument that overrides the scope object.
+ */
+ scopeobj = NULL;
+ if (argc >= 2) {
+ if (!js_ValueToObject(cx, argv[1], &scopeobj))
+ return JS_FALSE;
+ argv[1] = OBJECT_TO_JSVAL(scopeobj);
+ }
+ if (!scopeobj)
+ #endif
+ {
+ #if JS_HAS_EVAL_THIS_SCOPE
+ /* If obj.eval(str), emulate 'with (obj) eval(str)' in the caller. */
+ if (indirectCall) {
+ callerScopeChain = caller->scopeChain;
+ if (obj != callerScopeChain) {
+ if (!js_CheckPrincipalsAccess(cx, obj,
+ caller->script->principals,
+ js_eval_str)) {
+ return JS_FALSE;
+ }
+
+ scopeobj = js_NewObject(cx, &js_WithClass, obj,
+ callerScopeChain);
+ if (!scopeobj)
+ return JS_FALSE;
+
+ /* Set fp->scopeChain too, for the compiler. */
+ caller->scopeChain = fp->scopeChain = scopeobj;
+ setCallerScopeChain = JS_TRUE;
+ }
+
+ callerVarObj = caller->varobj;
+ if (obj != callerVarObj) {
+ /* Set fp->varobj too, for the compiler. */
+ caller->varobj = fp->varobj = obj;
+ setCallerVarObj = JS_TRUE;
+ }
+ }
+ /* From here on, control must exit through label out with ok set. */
+ #endif
+
+ #if JS_BUG_EVAL_THIS_SCOPE
+ /* An old version used the object in which eval was found for scope. */
+ scopeobj = obj;
+ #else
+ /* Compile using caller's current scope object. */
+ if (caller)
+ scopeobj = caller->scopeChain;
+ #endif
+ }
+
+ /* Ensure we compile this eval with the right object in the scope chain. */
+ scopeobj = js_CheckScopeChainValidity(cx, scopeobj, js_eval_str);
+ if (!scopeobj)
+ return JS_FALSE;
+
+ str = JSVAL_TO_STRING(argv[0]);
+ if (caller) {
+ file = caller->script->filename;
+ line = js_PCToLineNumber(cx, caller->script, caller->pc);
+ principals = JS_EvalFramePrincipals(cx, fp, caller);
+ } else {
+ file = NULL;
+ line = 0;
+ principals = NULL;
+ }
+
+ /*
+ * Set JSFRAME_EVAL on fp and any frames (e.g., fun_call if eval.call was
+ * invoked) between fp and its scripted caller, to help the compiler easily
+ * find the same caller whose scope and var obj we've set.
+ *
+ * XXX this nonsense could, and perhaps should, go away with a better way
+ * to pass params to the compiler than via the top-most frame.
+ */
+ do {
+ fp->flags |= JSFRAME_EVAL;
+ } while ((fp = fp->down) != caller);
+
+ script = JS_CompileUCScriptForPrincipals(cx, scopeobj, principals,
+ JSSTRING_CHARS(str),
+ JSSTRING_LENGTH(str),
+ file, line);
+ if (!script) {
+ ok = JS_FALSE;
+ goto out;
+ }
+
+ #if !JS_BUG_EVAL_THIS_SCOPE
+ #if JS_HAS_SCRIPT_OBJECT
+ if (argc < 2)
+ #endif
+ {
+ /* Execute using caller's new scope object (might be a Call object). */
+ if (caller)
+ scopeobj = caller->scopeChain;
+ }
+ #endif
+
+ /*
+ * Belt-and-braces: check that the lesser of eval's principals and the
+ * caller's principals has access to scopeobj.
+ */
+ ok = js_CheckPrincipalsAccess(cx, scopeobj, principals, js_eval_str);
+ if (!ok)
+ goto out;
+
+ ok = js_Execute(cx, scopeobj, script, caller, JSFRAME_EVAL, rval);
+ JS_DestroyScript(cx, script);
+
+ out:
+ #if JS_HAS_EVAL_THIS_SCOPE
+ /* Restore OBJ_GET_PARENT(scopeobj) not callerScopeChain in case of Call. */
+ if (setCallerScopeChain)
+ caller->scopeChain = callerScopeChain;
+ if (setCallerVarObj)
+ caller->varobj = callerVarObj;
+ #endif
+ return ok;
+ }
+
+ #if JS_HAS_OBJ_WATCHPOINT
+
+ static JSBool
+ obj_watch_handler(JSContext *cx, JSObject *obj, jsval id, jsval old, jsval *nvp,
+ void *closure)
+ {
+ JSResolvingKey key;
+ JSResolvingEntry *entry;
+ uint32 generation;
+ JSObject *funobj;
+ jsval argv[3];
+ JSBool ok;
+
+ /* Avoid recursion on (obj, id) already being watched on cx. */
+ key.obj = obj;
+ key.id = id;
+ if (!js_StartResolving(cx, &key, JSRESFLAG_WATCH, &entry))
+ return JS_FALSE;
+ if (!entry)
+ return JS_TRUE;
+ generation = cx->resolvingTable->generation;
+
+ funobj = (JSObject *) closure;
+ argv[0] = id;
+ argv[1] = old;
+ argv[2] = *nvp;
+ ok = js_InternalCall(cx, obj, OBJECT_TO_JSVAL(funobj), 3, argv, nvp);
+ js_StopResolving(cx, &key, JSRESFLAG_WATCH, entry, generation);
+ return ok;
+ }
+
+ static JSBool
+ obj_watch(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+ {
+ JSObject *callable;
+ jsval userid, value;
+ jsid propid;
+ uintN attrs;
+
+ callable = js_ValueToCallableObject(cx, &argv[1], 0);
+ if (!callable)
+ return JS_FALSE;
+
+ /* Compute the unique int/atom symbol id needed by js_LookupProperty. */
+ userid = argv[0];
+ if (!JS_ValueToId(cx, userid, &propid))
+ return JS_FALSE;
+
+ if (!OBJ_CHECK_ACCESS(cx, obj, propid, JSACC_WATCH, &value, &attrs))
+ return JS_FALSE;
+ if (attrs & JSPROP_READONLY)
+ return JS_TRUE;
+ return JS_SetWatchPoint(cx, obj, userid, obj_watch_handler, callable);
+ }
+
+ static JSBool
+ obj_unwatch(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+ {
+ return JS_ClearWatchPoint(cx, obj, argv[0], NULL, NULL);
+ }
+
+ #endif /* JS_HAS_OBJ_WATCHPOINT */
+
+ #if JS_HAS_NEW_OBJ_METHODS
+ /*
+ * Prototype and property query methods, to complement the 'in' and
+ * 'instanceof' operators.
+ */
+
+ /* Proposed ECMA 15.2.4.5. */
+ static JSBool
+ obj_hasOwnProperty(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
+ jsval *rval)
+ {
+ return js_HasOwnPropertyHelper(cx, obj, obj->map->ops->lookupProperty,
+ argc, argv, rval);
+ }
+
+ JSBool
+ js_HasOwnPropertyHelper(JSContext *cx, JSObject *obj, JSLookupPropOp lookup,
+ uintN argc, jsval *argv, jsval *rval)
+ {
+ jsid id;
+ JSObject *obj2;
+ JSProperty *prop;
+ JSScopeProperty *sprop;
+
+ if (!JS_ValueToId(cx, argv[0], &id))
+ return JS_FALSE;
+ if (!lookup(cx, obj, id, &obj2, &prop))
+ return JS_FALSE;
+ if (!prop) {
+ *rval = JSVAL_FALSE;
+ } else if (obj2 == obj) {
+ *rval = JSVAL_TRUE;
+ } else if (OBJ_IS_NATIVE(obj2)) {
+ sprop = (JSScopeProperty *)prop;
+ *rval = BOOLEAN_TO_JSVAL(SPROP_IS_SHARED_PERMANENT(sprop));
+ } else {
+ *rval = JSVAL_FALSE;
+ }
+ if (prop)
+ OBJ_DROP_PROPERTY(cx, obj2, prop);
+ return JS_TRUE;
+ }
+
+ /* Proposed ECMA 15.2.4.6. */
+ static JSBool
+ obj_isPrototypeOf(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
+ jsval *rval)
+ {
+ JSBool b;
+
+ if (!js_IsDelegate(cx, obj, *argv, &b))
+ return JS_FALSE;
+ *rval = BOOLEAN_TO_JSVAL(b);
+ return JS_TRUE;
+ }
+
+ /* Proposed ECMA 15.2.4.7. */
+ static JSBool
+ obj_propertyIsEnumerable(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
+ jsval *rval)
+ {
+ jsid id;
+ uintN attrs;
+ JSObject *obj2;
+ JSProperty *prop;
+ JSBool ok;
+
+ if (!JS_ValueToId(cx, argv[0], &id))
+ return JS_FALSE;
+
+ if (!OBJ_LOOKUP_PROPERTY(cx, obj, id, &obj2, &prop))
+ return JS_FALSE;
+
+ if (!prop) {
+ *rval = JSVAL_FALSE;
+ return JS_TRUE;
+ }
+
+ /*
+ * XXX ECMA spec error compatible: return false unless hasOwnProperty.
+ * The ECMA spec really should be fixed so propertyIsEnumerable and the
+ * for..in loop agree on whether prototype properties are enumerable,
+ * obviously by fixing this method (not by breaking the for..in loop!).
+ *
+ * We check here for shared permanent prototype properties, which should
+ * be treated as if they are local to obj. They are an implementation
+ * technique used to satisfy ECMA requirements; users should not be able
+ * to distinguish a shared permanent proto-property from a local one.
+ */
+ if (obj2 != obj &&
+ !(OBJ_IS_NATIVE(obj2) &&
+ SPROP_IS_SHARED_PERMANENT((JSScopeProperty *)prop))) {
+ OBJ_DROP_PROPERTY(cx, obj2, prop);
+ *rval = JSVAL_FALSE;
+ return JS_TRUE;
+ }
+
+ ok = OBJ_GET_ATTRIBUTES(cx, obj2, id, prop, &attrs);
+ OBJ_DROP_PROPERTY(cx, obj2, prop);
+ if (ok)
+ *rval = BOOLEAN_TO_JSVAL((attrs & JSPROP_ENUMERATE) != 0);
+ return ok;
+ }
+ #endif /* JS_HAS_NEW_OBJ_METHODS */
+
+ #if JS_HAS_GETTER_SETTER
+ static JSBool
+ obj_defineGetter(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
+ jsval *rval)
+ {
+ jsval fval, junk;
+ jsid id;
+ uintN attrs;
+
+ fval = argv[1];
+ if (JS_TypeOfValue(cx, fval) != JSTYPE_FUNCTION) {
+ JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
+ JSMSG_BAD_GETTER_OR_SETTER,
+ js_getter_str);
+ return JS_FALSE;
+ }
+
+ if (!JS_ValueToId(cx, argv[0], &id))
+ return JS_FALSE;
+ if (!js_CheckRedeclaration(cx, obj, id, JSPROP_GETTER, NULL, NULL))
+ return JS_FALSE;
+ /*
+ * Getters and setters are just like watchpoints from an access
+ * control point of view.
+ */
+ if (!OBJ_CHECK_ACCESS(cx, obj, id, JSACC_WATCH, &junk, &attrs))
+ return JS_FALSE;
+ return OBJ_DEFINE_PROPERTY(cx, obj, id, JSVAL_VOID,
+ (JSPropertyOp) JSVAL_TO_OBJECT(fval), NULL,
+ JSPROP_ENUMERATE | JSPROP_GETTER | JSPROP_SHARED,
+ NULL);
+ }
+
+ static JSBool
+ obj_defineSetter(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
+ jsval *rval)
+ {
+ jsval fval, junk;
+ jsid id;
+ uintN attrs;
+
+ fval = argv[1];
+ if (JS_TypeOfValue(cx, fval) != JSTYPE_FUNCTION) {
+ JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
+ JSMSG_BAD_GETTER_OR_SETTER,
+ js_setter_str);
+ return JS_FALSE;
+ }
+
+ if (!JS_ValueToId(cx, argv[0], &id))
+ return JS_FALSE;
+ if (!js_CheckRedeclaration(cx, obj, id, JSPROP_SETTER, NULL, NULL))
+ return JS_FALSE;
+ /*
+ * Getters and setters are just like watchpoints from an access
+ * control point of view.
+ */
+ if (!OBJ_CHECK_ACCESS(cx, obj, id, JSACC_WATCH, &junk, &attrs))
+ return JS_FALSE;
+ return OBJ_DEFINE_PROPERTY(cx, obj, id, JSVAL_VOID,
+ NULL, (JSPropertyOp) JSVAL_TO_OBJECT(fval),
+ JSPROP_ENUMERATE | JSPROP_SETTER | JSPROP_SHARED,
+ NULL);
+ }
+
+ static JSBool
+ obj_lookupGetter(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
+ jsval *rval)
+ {
+ jsid id;
+ JSObject *pobj;
+ JSProperty *prop;
+ JSScopeProperty *sprop;
+
+ if (!JS_ValueToId(cx, argv[0], &id))
+ return JS_FALSE;
+ if (!OBJ_LOOKUP_PROPERTY(cx, obj, id, &pobj, &prop))
+ return JS_FALSE;
+ if (prop) {
+ if (OBJ_IS_NATIVE(pobj)) {
+ sprop = (JSScopeProperty *) prop;
+ if (sprop->attrs & JSPROP_GETTER)
+ *rval = OBJECT_TO_JSVAL(sprop->getter);
+ }
+ OBJ_DROP_PROPERTY(cx, pobj, prop);
+ }
+ return JS_TRUE;
+ }
+
+ static JSBool
+ obj_lookupSetter(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
+ jsval *rval)
+ {
+ jsid id;
+ JSObject *pobj;
+ JSProperty *prop;
+ JSScopeProperty *sprop;
+
+ if (!JS_ValueToId(cx, argv[0], &id))
+ return JS_FALSE;
+ if (!OBJ_LOOKUP_PROPERTY(cx, obj, id, &pobj, &prop))
+ return JS_FALSE;
+ if (prop) {
+ if (OBJ_IS_NATIVE(pobj)) {
+ sprop = (JSScopeProperty *) prop;
+ if (sprop->attrs & JSPROP_SETTER)
+ *rval = OBJECT_TO_JSVAL(sprop->setter);
+ }
+ OBJ_DROP_PROPERTY(cx, pobj, prop);
+ }
+ return JS_TRUE;
+ }
+ #endif /* JS_HAS_GETTER_SETTER */
+
+ #if JS_HAS_OBJ_WATCHPOINT
+ const char js_watch_str[] = "watch";
+ const char js_unwatch_str[] = "unwatch";
+ #endif
+ #if JS_HAS_NEW_OBJ_METHODS
+ const char js_hasOwnProperty_str[] = "hasOwnProperty";
+ const char js_isPrototypeOf_str[] = "isPrototypeOf";
+ const char js_propertyIsEnumerable_str[] = "propertyIsEnumerable";
+ #endif
+ #if JS_HAS_GETTER_SETTER
+ const char js_defineGetter_str[] = "__defineGetter__";
+ const char js_defineSetter_str[] = "__defineSetter__";
+ const char js_lookupGetter_str[] = "__lookupGetter__";
+ const char js_lookupSetter_str[] = "__lookupSetter__";
+ #endif
+
+ static JSFunctionSpec object_methods[] = {
+ #if JS_HAS_TOSOURCE
+ {js_toSource_str, js_obj_toSource, 0, 0, OBJ_TOSTRING_EXTRA},
+ #endif
+ {js_toString_str, js_obj_toString, 0, 0, OBJ_TOSTRING_EXTRA},
+ {js_toLocaleString_str, js_obj_toLocaleString, 0, 0, OBJ_TOSTRING_EXTRA},
+ {js_valueOf_str, obj_valueOf, 0,0,0},
+ {js_eval_str, obj_eval, 1,0,0},
+ #if JS_HAS_OBJ_WATCHPOINT
+ {js_watch_str, obj_watch, 2,0,0},
+ {js_unwatch_str, obj_unwatch, 1,0,0},
+ #endif
+ #if JS_HAS_NEW_OBJ_METHODS
+ {js_hasOwnProperty_str, obj_hasOwnProperty, 1,0,0},
+ {js_isPrototypeOf_str, obj_isPrototypeOf, 1,0,0},
+ {js_propertyIsEnumerable_str, obj_propertyIsEnumerable, 1,0,0},
+ #endif
+ #if JS_HAS_GETTER_SETTER
+ {js_defineGetter_str, obj_defineGetter, 2,0,0},
+ {js_defineSetter_str, obj_defineSetter, 2,0,0},
+ {js_lookupGetter_str, obj_lookupGetter, 1,0,0},
+ {js_lookupSetter_str, obj_lookupSetter, 1,0,0},
+ #endif
+ {0,0,0,0,0}
+ };
+
+ static JSBool
+ Object(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+ {
+ if (argc == 0) {
+ /* Trigger logic below to construct a blank object. */
+ obj = NULL;
+ } else {
+ /* If argv[0] is null or undefined, obj comes back null. */
+ if (!js_ValueToObject(cx, argv[0], &obj))
+ return JS_FALSE;
+ }
+ if (!obj) {
+ JS_ASSERT(!argc || JSVAL_IS_NULL(argv[0]) || JSVAL_IS_VOID(argv[0]));
+ if (cx->fp->flags & JSFRAME_CONSTRUCTING)
+ return JS_TRUE;
+ obj = js_NewObject(cx, &js_ObjectClass, NULL, NULL);
+ if (!obj)
+ return JS_FALSE;
+ }
+ *rval = OBJECT_TO_JSVAL(obj);
+ return JS_TRUE;
+ }
+
+ /*
+ * ObjectOps and Class for with-statement stack objects.
+ */
+ static JSBool
+ with_LookupProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
+ JSProperty **propp)
+ {
+ JSObject *proto = OBJ_GET_PROTO(cx, obj);
+ if (!proto)
+ return js_LookupProperty(cx, obj, id, objp, propp);
+ return OBJ_LOOKUP_PROPERTY(cx, proto, id, objp, propp);
+ }
+
+ static JSBool
+ with_GetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
+ {
+ JSObject *proto = OBJ_GET_PROTO(cx, obj);
+ if (!proto)
+ return js_GetProperty(cx, obj, id, vp);
+ return OBJ_GET_PROPERTY(cx, proto, id, vp);
+ }
+
+ static JSBool
+ with_SetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
+ {
+ JSObject *proto = OBJ_GET_PROTO(cx, obj);
+ if (!proto)
+ return js_SetProperty(cx, obj, id, vp);
+ return OBJ_SET_PROPERTY(cx, proto, id, vp);
+ }
+
+ static JSBool
+ with_GetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop,
+ uintN *attrsp)
+ {
+ JSObject *proto = OBJ_GET_PROTO(cx, obj);
+ if (!proto)
+ return js_GetAttributes(cx, obj, id, prop, attrsp);
+ return OBJ_GET_ATTRIBUTES(cx, proto, id, prop, attrsp);
+ }
+
+ static JSBool
+ with_SetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop,
+ uintN *attrsp)
+ {
+ JSObject *proto = OBJ_GET_PROTO(cx, obj);
+ if (!proto)
+ return js_SetAttributes(cx, obj, id, prop, attrsp);
+ return OBJ_SET_ATTRIBUTES(cx, proto, id, prop, attrsp);
+ }
+
+ static JSBool
+ with_DeleteProperty(JSContext *cx, JSObject *obj, jsid id, jsval *rval)
+ {
+ JSObject *proto = OBJ_GET_PROTO(cx, obj);
+ if (!proto)
+ return js_DeleteProperty(cx, obj, id, rval);
+ return OBJ_DELETE_PROPERTY(cx, proto, id, rval);
+ }
+
+ static JSBool
+ with_DefaultValue(JSContext *cx, JSObject *obj, JSType hint, jsval *vp)
+ {
+ JSObject *proto = OBJ_GET_PROTO(cx, obj);
+ if (!proto)
+ return js_DefaultValue(cx, obj, hint, vp);
+ return OBJ_DEFAULT_VALUE(cx, proto, hint, vp);
+ }
+
+ static JSBool
+ with_Enumerate(JSContext *cx, JSObject *obj, JSIterateOp enum_op,
+ jsval *statep, jsid *idp)
+ {
+ JSObject *proto = OBJ_GET_PROTO(cx, obj);
+ if (!proto)
+ return js_Enumerate(cx, obj, enum_op, statep, idp);
+ return OBJ_ENUMERATE(cx, proto, enum_op, statep, idp);
+ }
+
+ static JSBool
+ with_CheckAccess(JSContext *cx, JSObject *obj, jsid id, JSAccessMode mode,
+ jsval *vp, uintN *attrsp)
+ {
+ JSObject *proto = OBJ_GET_PROTO(cx, obj);
+ if (!proto)
+ return js_CheckAccess(cx, obj, id, mode, vp, attrsp);
+ return OBJ_CHECK_ACCESS(cx, proto, id, mode, vp, attrsp);
+ }
+
+ static JSObject *
+ with_ThisObject(JSContext *cx, JSObject *obj)
+ {
+ JSObject *proto = OBJ_GET_PROTO(cx, obj);
+ if (!proto)
+ return obj;
+ return OBJ_THIS_OBJECT(cx, proto);
+ }
+
+ JS_FRIEND_DATA(JSObjectOps) js_WithObjectOps = {
+ js_NewObjectMap, js_DestroyObjectMap,
+ with_LookupProperty, js_DefineProperty,
+ with_GetProperty, with_SetProperty,
+ with_GetAttributes, with_SetAttributes,
+ with_DeleteProperty, with_DefaultValue,
+ with_Enumerate, with_CheckAccess,
+ with_ThisObject, NATIVE_DROP_PROPERTY,
+ NULL, NULL,
+ NULL, NULL,
+ js_SetProtoOrParent, js_SetProtoOrParent,
+ js_Mark, js_Clear,
+ NULL, NULL
+ };
+
+ static JSObjectOps *
+ with_getObjectOps(JSContext *cx, JSClass *clasp)
+ {
+ return &js_WithObjectOps;
+ }
+
+ JSClass js_WithClass = {
+ "With",
+ JSCLASS_HAS_PRIVATE,
+ JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
+ JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, JS_FinalizeStub,
+ with_getObjectOps,
+ 0,0,0,0,0,0,0
+ };
+
+ #if JS_HAS_OBJ_PROTO_PROP
+ static JSBool
+ With(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+ {
+ JSObject *parent, *proto;
+ jsval v;
+
+ if (!JS_ReportErrorFlagsAndNumber(cx,
+ JSREPORT_WARNING | JSREPORT_STRICT,
+ js_GetErrorMessage, NULL,
+ JSMSG_DEPRECATED_USAGE,
+ js_WithClass.name)) {
+ return JS_FALSE;
+ }
+
+ if (!(cx->fp->flags & JSFRAME_CONSTRUCTING)) {
+ obj = js_NewObject(cx, &js_WithClass, NULL, NULL);
+ if (!obj)
+ return JS_FALSE;
+ *rval = OBJECT_TO_JSVAL(obj);
+ }
+
+ parent = cx->fp->scopeChain;
+ if (argc > 0) {
+ if (!js_ValueToObject(cx, argv[0], &proto))
+ return JS_FALSE;
+ v = OBJECT_TO_JSVAL(proto);
+ if (!obj_setSlot(cx, obj, INT_TO_JSVAL(JSSLOT_PROTO), &v))
+ return JS_FALSE;
+ if (argc > 1) {
+ if (!js_ValueToObject(cx, argv[1], &parent))
+ return JS_FALSE;
+ }
+ }
+ v = OBJECT_TO_JSVAL(parent);
+ return obj_setSlot(cx, obj, INT_TO_JSVAL(JSSLOT_PARENT), &v);
+ }
+ #endif
+
+ JSObject *
+ js_InitObjectClass(JSContext *cx, JSObject *obj)
+ {
+ JSObject *proto;
+ jsval eval;
+
+ #if JS_HAS_SHARP_VARS
+ JS_ASSERT(sizeof(jsatomid) * JS_BITS_PER_BYTE >= ATOM_INDEX_LIMIT_LOG2 + 1);
+ #endif
+
+ proto = JS_InitClass(cx, obj, NULL, &js_ObjectClass, Object, 1,
+ object_props, object_methods, NULL, NULL);
+ if (!proto)
+ return NULL;
+
+ #if JS_HAS_OBJ_PROTO_PROP
+ if (!JS_InitClass(cx, obj, NULL, &js_WithClass, With, 0,
+ NULL, NULL, NULL, NULL)) {
+ return NULL;
+ }
+ #endif
+
+ /* ECMA (15.1.2.1) says 'eval' is also a property of the global object. */
+ if (!OBJ_GET_PROPERTY(cx, proto,
+ ATOM_TO_JSID(cx->runtime->atomState.evalAtom),
+ &eval)) {
+ return NULL;
+ }
+ if (!OBJ_DEFINE_PROPERTY(cx, obj,
+ ATOM_TO_JSID(cx->runtime->atomState.evalAtom),
+ eval, NULL, NULL, 0, NULL)) {
+ return NULL;
+ }
+
+ return proto;
+ }
+
+ void
+ js_InitObjectMap(JSObjectMap *map, jsrefcount nrefs, JSObjectOps *ops,
+ JSClass *clasp)
+ {
+ map->nrefs = nrefs;
+ map->ops = ops;
+ map->nslots = JS_INITIAL_NSLOTS;
+ map->freeslot = JSSLOT_FREE(clasp);
+ }
+
+ JSObjectMap *
+ js_NewObjectMap(JSContext *cx, jsrefcount nrefs, JSObjectOps *ops,
+ JSClass *clasp, JSObject *obj)
+ {
+ return (JSObjectMap *) js_NewScope(cx, nrefs, ops, clasp, obj);
+ }
+
+ void
+ js_DestroyObjectMap(JSContext *cx, JSObjectMap *map)
+ {
+ js_DestroyScope(cx, (JSScope *)map);
+ }
+
+ JSObjectMap *
+ js_HoldObjectMap(JSContext *cx, JSObjectMap *map)
+ {
+ JS_ASSERT(map->nrefs >= 0);
+ JS_ATOMIC_INCREMENT(&map->nrefs);
+ return map;
+ }
+
+ JSObjectMap *
+ js_DropObjectMap(JSContext *cx, JSObjectMap *map, JSObject *obj)
+ {
+ JS_ASSERT(map->nrefs > 0);
+ JS_ATOMIC_DECREMENT(&map->nrefs);
+ if (map->nrefs == 0) {
+ map->ops->destroyObjectMap(cx, map);
+ return NULL;
+ }
+ if (MAP_IS_NATIVE(map) && ((JSScope *)map)->object == obj)
+ ((JSScope *)map)->object = NULL;
+ return map;
+ }
+
+ static JSBool
+ GetClassPrototype(JSContext *cx, JSObject *scope, const char *name,
+ JSObject **protop);
+
+ static jsval *
+ AllocSlots(JSContext *cx, jsval *slots, uint32 nslots)
+ {
+ size_t nbytes, obytes, minbytes;
+ uint32 i, oslots;
+ jsval *newslots;
+
+ nbytes = (nslots + 1) * sizeof(jsval);
+ if (slots) {
+ oslots = slots[-1];
+ obytes = (oslots + 1) * sizeof(jsval);
+ } else {
+ oslots = 0;
+ obytes = 0;
+ }
+
+ if (nbytes <= GC_NBYTES_MAX) {
+ newslots = (jsval *) js_NewGCThing(cx, GCX_PRIVATE, nbytes);
+ } else {
+ newslots = (jsval *)
+ JS_realloc(cx,
+ (obytes <= GC_NBYTES_MAX) ? NULL : slots - 1,
+ nbytes);
+ }
+ if (!newslots)
+ return NULL;
+
+ if (obytes != 0) {
+ /* If either nbytes or obytes fit in a GC-thing, we must copy. */
+ minbytes = JS_MIN(nbytes, obytes);
+ if (minbytes <= GC_NBYTES_MAX)
+ memcpy(newslots + 1, slots, minbytes - sizeof(jsval));
+
+ /* If nbytes are in a GC-thing but obytes aren't, free obytes. */
+ if (nbytes <= GC_NBYTES_MAX && obytes > GC_NBYTES_MAX)
+ JS_free(cx, slots - 1);
+
+ /* If we're extending an allocation, initialize free slots. */
+ if (nslots > oslots) {
+ for (i = 1 + oslots; i <= nslots; i++)
+ newslots[i] = JSVAL_VOID;
+ }
+ }
+
+ newslots[0] = nslots;
+ return ++newslots;
+ }
+
+ static void
+ FreeSlots(JSContext *cx, jsval *slots)
+ {
+ size_t nbytes;
+
+ /*
+ * NB: We count on smaller GC-things being finalized before larger things
+ * that become garbage during the same GC. Without this assumption, we
+ * couldn't load slots[-1] here without possibly loading a gcFreeList link
+ * (see struct JSGCThing in jsgc.h).
+ */
+ nbytes = (slots[-1] + 1) * sizeof(jsval);
+ if (nbytes > GC_NBYTES_MAX)
+ JS_free(cx, slots - 1);
+ }
+
+ JSObject *
+ js_NewObject(JSContext *cx, JSClass *clasp, JSObject *proto, JSObject *parent)
+ {
+ JSObject *obj;
+ JSObjectOps *ops;
+ JSObjectMap *map;
+ JSClass *protoclasp;
+ uint32 nslots, i;
+ jsval *newslots;
+
+ /* Bootstrap the ur-object, and make it the default prototype object. */
+ if (!proto) {
+ if (!GetClassPrototype(cx, parent, clasp->name, &proto))
+ return NULL;
+ if (!proto && !GetClassPrototype(cx, parent, js_Object_str, &proto))
+ return NULL;
+ }
+
+ /* Always call the class's getObjectOps hook if it has one. */
+ ops = clasp->getObjectOps
+ ? clasp->getObjectOps(cx, clasp)
+ : &js_ObjectOps;
+
+ /*
+ * Allocate a zeroed object from the GC heap. Do this *after* any other
+ * GC-thing allocations under GetClassPrototype or clasp->getObjectOps,
+ * to avoid displacing the newborn root for obj.
+ */
+ obj = (JSObject *) js_NewGCThing(cx, GCX_OBJECT, sizeof(JSObject));
+ if (!obj)
+ return NULL;
+
+ /*
+ * Share proto's map only if it has the same JSObjectOps, and only if
+ * proto's class has the same private and reserved slots as obj's map
+ * and class have. We assume that if prototype and object are of the
+ * same class, they always have the same number of computed reserved
+ * slots (returned via clasp->reserveSlots); otherwise, prototype and
+ * object classes must have the same (null or not) reserveSlots hook.
+ */
+ if (proto &&
+ (map = proto->map)->ops == ops &&
+ ((protoclasp = OBJ_GET_CLASS(cx, proto)) == clasp ||
+ (!((protoclasp->flags ^ clasp->flags) &
+ (JSCLASS_HAS_PRIVATE |
+ (JSCLASS_RESERVED_SLOTS_MASK << JSCLASS_RESERVED_SLOTS_SHIFT))) &&
+ protoclasp->reserveSlots == clasp->reserveSlots)))
+ {
+ /*
+ * Default parent to the parent of the prototype, which was set from
+ * the parent of the prototype's constructor.
+ */
+ if (!parent)
+ parent = OBJ_GET_PARENT(cx, proto);
+
+ /* Share the given prototype's map. */
+ obj->map = js_HoldObjectMap(cx, map);
+
+ /* Ensure that obj starts with the minimum slots for clasp. */
+ nslots = JS_INITIAL_NSLOTS;
+ } else {
+ /* Leave parent alone. Allocate a new map for obj. */
+ map = ops->newObjectMap(cx, 1, ops, clasp, obj);
+ if (!map)
+ goto bad;
+ obj->map = map;
+
+ /* Let ops->newObjectMap set nslots so as to reserve slots. */
+ nslots = map->nslots;
+ }
+
+ /* Allocate a slots vector, with a -1'st element telling its length. */
+ newslots = AllocSlots(cx, NULL, nslots);
+ if (!newslots) {
+ js_DropObjectMap(cx, obj->map, obj);
+ obj->map = NULL;
+ goto bad;
+ }
+
+ /* Set the proto, parent, and class properties. */
+ newslots[JSSLOT_PROTO] = OBJECT_TO_JSVAL(proto);
+ newslots[JSSLOT_PARENT] = OBJECT_TO_JSVAL(parent);
+ newslots[JSSLOT_CLASS] = PRIVATE_TO_JSVAL(clasp);
+
+ /* Clear above JSSLOT_CLASS so the GC doesn't load uninitialized memory. */
+ for (i = JSSLOT_CLASS + 1; i < nslots; i++)
+ newslots[i] = JSVAL_VOID;
+
+ /* Store newslots after initializing all of 'em, just in case. */
+ obj->slots = newslots;
+
+ if (cx->runtime->objectHook) {
+ JS_KEEP_ATOMS(cx->runtime);
+ cx->runtime->objectHook(cx, obj, JS_TRUE, cx->runtime->objectHookData);
+ JS_UNKEEP_ATOMS(cx->runtime);
+ }
+
+ return obj;
+
+ bad:
+ cx->newborn[GCX_OBJECT] = NULL;
+ return NULL;
+ }
+
+ JSBool
+ js_FindConstructor(JSContext *cx, JSObject *start, const char *name, jsval *vp)
+ {
+ JSAtom *atom;
+ JSObject *obj, *pobj;
+ JSProperty *prop;
+ JSScopeProperty *sprop;
+
+ atom = js_Atomize(cx, name, strlen(name), 0);
+ if (!atom)
+ return JS_FALSE;
+
+ if (start || (cx->fp && (start = cx->fp->scopeChain) != NULL)) {
+ /* Find the topmost object in the scope chain. */
+ do {
+ obj = start;
+ start = OBJ_GET_PARENT(cx, obj);
+ } while (start);
+ } else {
+ obj = cx->globalObject;
+ if (!obj) {
+ *vp = JSVAL_VOID;
+ return JS_TRUE;
+ }
+ }
+
+ JS_ASSERT(OBJ_IS_NATIVE(obj));
+ if (!js_LookupPropertyWithFlags(cx, obj, ATOM_TO_JSID(atom),
+ JSRESOLVE_CLASSNAME, &pobj, &prop)) {
+ return JS_FALSE;
+ }
+ if (!prop) {
+ *vp = JSVAL_VOID;
+ return JS_TRUE;
+ }
+
+ JS_ASSERT(OBJ_IS_NATIVE(pobj));
+ sprop = (JSScopeProperty *) prop;
+ JS_ASSERT(SPROP_HAS_VALID_SLOT(sprop, OBJ_SCOPE(pobj)));
+ *vp = OBJ_GET_SLOT(cx, pobj, sprop->slot);
+ OBJ_DROP_PROPERTY(cx, pobj, prop);
+ return JS_TRUE;
+ }
+
+ JSObject *
+ js_ConstructObject(JSContext *cx, JSClass *clasp, JSObject *proto,
+ JSObject *parent, uintN argc, jsval *argv)
+ {
+ jsval cval, rval;
+ JSTempValueRooter tvr;
+ JSObject *obj, *ctor;
+
+ if (!js_FindConstructor(cx, parent, clasp->name, &cval))
+ return NULL;
+ if (JSVAL_IS_PRIMITIVE(cval)) {
+ js_ReportIsNotFunction(cx, &cval, JSV2F_CONSTRUCT | JSV2F_SEARCH_STACK);
+ return NULL;
+ }
+
+ /*
+ * Protect cval in case a crazy getter for .prototype uproots it. After
+ * this point, all control flow must exit through label out with obj set.
+ */
+ JS_PUSH_SINGLE_TEMP_ROOT(cx, cval, &tvr);
+ obj = NULL;
+
+ /*
+ * If proto or parent are NULL, set them to Constructor.prototype and/or
+ * Constructor.__parent__, just like JSOP_NEW does.
+ */
+ ctor = JSVAL_TO_OBJECT(cval);
+ if (!parent)
+ parent = OBJ_GET_PARENT(cx, ctor);
+ if (!proto) {
+ if (!OBJ_GET_PROPERTY(cx, ctor,
+ ATOM_TO_JSID(cx->runtime->atomState
+ .classPrototypeAtom),
+ &rval)) {
+ goto out;
+ }
+ if (JSVAL_IS_OBJECT(rval))
+ proto = JSVAL_TO_OBJECT(rval);
+ }
+
+ obj = js_NewObject(cx, clasp, proto, parent);
+ if (!obj)
+ goto out;
+
+ if (!js_InternalConstruct(cx, obj, cval, argc, argv, &rval)) {
+ cx->newborn[GCX_OBJECT] = NULL;
+ obj = NULL;
+ goto out;
+ }
+
+ if (!JSVAL_IS_PRIMITIVE(rval))
+ obj = JSVAL_TO_OBJECT(rval);
+ out:
+ JS_POP_TEMP_ROOT(cx, &tvr);
+ return obj;
+ }
+
+ void
+ js_FinalizeObject(JSContext *cx, JSObject *obj)
+ {
+ JSObjectMap *map;
+
+ /* Cope with stillborn objects that have no map. */
+ map = obj->map;
+ if (!map)
+ return;
+ JS_ASSERT(obj->slots);
+
+ if (cx->runtime->objectHook)
+ cx->runtime->objectHook(cx, obj, JS_FALSE, cx->runtime->objectHookData);
+
+ /* Remove all watchpoints with weak links to obj. */
+ JS_ClearWatchPointsForObject(cx, obj);
+
+ /*
+ * Finalize obj first, in case it needs map and slots. Optimized to use
+ * LOCKED_OBJ_GET_CLASS instead of OBJ_GET_CLASS, so we avoid "promoting"
+ * obj's scope from lock-free to lock-full (see jslock.c:ClaimScope) when
+ * we're called from the GC. Only the GC should call js_FinalizeObject,
+ * and no other threads run JS (and possibly racing to update obj->slots)
+ * while the GC is running.
+ */
+ LOCKED_OBJ_GET_CLASS(obj)->finalize(cx, obj);
+
+ /* Drop map and free slots. */
+ js_DropObjectMap(cx, map, obj);
+ obj->map = NULL;
+ FreeSlots(cx, obj->slots);
+ obj->slots = NULL;
+ }
+
+ /* XXXbe if one adds props, deletes earlier props, adds more, the last added
+ won't recycle the deleted props' slots. */
+ JSBool
+ js_AllocSlot(JSContext *cx, JSObject *obj, uint32 *slotp)
+ {
+ JSObjectMap *map;
+ JSClass *clasp;
+ uint32 nslots;
+ jsval *newslots;
+
+ map = obj->map;
+ JS_ASSERT(!MAP_IS_NATIVE(map) || ((JSScope *)map)->object == obj);
+ clasp = LOCKED_OBJ_GET_CLASS(obj);
+ if (map->freeslot == JSSLOT_FREE(clasp)) {
+ /* Adjust map->freeslot to include computed reserved slots, if any. */
+ if (clasp->reserveSlots)
+ map->freeslot += clasp->reserveSlots(cx, obj);
+ }
+ nslots = map->nslots;
+ if (map->freeslot >= nslots) {
+ nslots = map->freeslot;
+ JS_ASSERT(nslots >= JS_INITIAL_NSLOTS);
+ nslots += (nslots + 1) / 2;
+
+ newslots = AllocSlots(cx, obj->slots, nslots);
+ if (!newslots)
+ return JS_FALSE;
+ map->nslots = nslots;
+ obj->slots = newslots;
+ }
+
+ #ifdef TOO_MUCH_GC
+ obj->slots[map->freeslot] = JSVAL_VOID;
+ #endif
+ *slotp = map->freeslot++;
+ return JS_TRUE;
+ }
+
+ void
+ js_FreeSlot(JSContext *cx, JSObject *obj, uint32 slot)
+ {
+ JSObjectMap *map;
+ uint32 nslots;
+ jsval *newslots;
+
+ OBJ_CHECK_SLOT(obj, slot);
+ obj->slots[slot] = JSVAL_VOID;
+ map = obj->map;
+ JS_ASSERT(!MAP_IS_NATIVE(map) || ((JSScope *)map)->object == obj);
+ if (map->freeslot == slot + 1)
+ map->freeslot = slot;
+ nslots = map->nslots;
+ if (nslots > JS_INITIAL_NSLOTS && map->freeslot < nslots / 2) {
+ nslots = map->freeslot;
+ nslots += nslots / 2;
+ if (nslots < JS_INITIAL_NSLOTS)
+ nslots = JS_INITIAL_NSLOTS;
+
+ newslots = AllocSlots(cx, obj->slots, nslots);
+ if (!newslots)
+ return;
+ map->nslots = nslots;
+ obj->slots = newslots;
+ }
+ }
+
+ #if JS_BUG_EMPTY_INDEX_ZERO
+ #define CHECK_FOR_EMPTY_INDEX(id) \
+ JS_BEGIN_MACRO \
+ if (JSSTRING_LENGTH(_str) == 0) \
+ id = JSVAL_ZERO; \
+ JS_END_MACRO
+ #else
+ #define CHECK_FOR_EMPTY_INDEX(id) /* nothing */
+ #endif
+
+ /* JSVAL_INT_MAX as a string */
+ #define JSVAL_INT_MAX_STRING "1073741823"
+
+ #define CHECK_FOR_STRING_INDEX(id) \
+ JS_BEGIN_MACRO \
+ if (JSID_IS_ATOM(id)) { \
+ JSAtom *atom_ = JSID_TO_ATOM(id); \
+ JSString *str_ = ATOM_TO_STRING(atom_); \
+ const jschar *cp_ = str_->chars; \
+ JSBool negative_ = (*cp_ == '-'); \
+ if (negative_) cp_++; \
+ if (JS7_ISDEC(*cp_) && \
+ str_->length - negative_ <= sizeof(JSVAL_INT_MAX_STRING)-1) { \
+ id = CheckForStringIndex(id, cp_, negative_); \
+ } else { \
+ CHECK_FOR_EMPTY_INDEX(id); \
+ } \
+ } \
+ JS_END_MACRO
+
+ static jsid
+ CheckForStringIndex(jsid id, const jschar *cp, JSBool negative)
+ {
+ jsuint index = JS7_UNDEC(*cp++);
+ jsuint oldIndex = 0;
+ jsuint c = 0;
+
+ if (index != 0) {
+ while (JS7_ISDEC(*cp)) {
+ oldIndex = index;
+ c = JS7_UNDEC(*cp);
+ index = 10 * index + c;
+ cp++;
+ }
+ }
+ if (*cp == 0 &&
+ (oldIndex < (JSVAL_INT_MAX / 10) ||
+ (oldIndex == (JSVAL_INT_MAX / 10) &&
+ c <= (JSVAL_INT_MAX % 10)))) {
+ if (negative)
+ index = 0 - index;
+ id = INT_TO_JSID((jsint)index);
+ }
+ return id;
+ }
+
+ static JSBool
+ HidePropertyName(JSContext *cx, jsid *idp)
+ {
+ jsid id;
+ JSAtom *atom, *hidden;
+
+ id = *idp;
+ JS_ASSERT(JSID_IS_ATOM(id));
+
+ atom = JSID_TO_ATOM(id);
+ JS_ASSERT(!(atom->flags & ATOM_HIDDEN));
+ JS_ASSERT(ATOM_IS_STRING(atom));
+
+ hidden = js_AtomizeString(cx, ATOM_TO_STRING(atom), ATOM_HIDDEN);
+ if (!hidden)
+ return JS_FALSE;
+
+ /*
+ * Link hidden to unhidden atom to optimize call_enumerate -- this means
+ * the GC must mark a hidden atom's unhidden counterpart (see js_MarkAtom
+ * in jsgc.c). It overloads the entry.value member, which for unhidden
+ * atoms may point to keyword information.
+ */
+ hidden->entry.value = atom;
+ *idp = ATOM_TO_JSID(hidden);
+ return JS_TRUE;
+ }
+
+ JSScopeProperty *
+ js_AddHiddenProperty(JSContext *cx, JSObject *obj, jsid id,
+ JSPropertyOp getter, JSPropertyOp setter, uint32 slot,
+ uintN attrs, uintN flags, intN shortid)
+ {
+ if (!HidePropertyName(cx, &id))
+ return NULL;
+
+ flags |= SPROP_IS_HIDDEN;
+ return js_AddNativeProperty(cx, obj, id, getter, setter, slot, attrs,
+ flags, shortid);
+ }
+
+ JSBool
+ js_LookupHiddenProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
+ JSProperty **propp)
+ {
+ return HidePropertyName(cx, &id) &&
+ js_LookupProperty(cx, obj, id, objp, propp);
+ }
+
+ JSScopeProperty *
+ js_AddNativeProperty(JSContext *cx, JSObject *obj, jsid id,
+ JSPropertyOp getter, JSPropertyOp setter, uint32 slot,
+ uintN attrs, uintN flags, intN shortid)
+ {
+ JSScope *scope;
+ JSScopeProperty *sprop;
+
+ JS_LOCK_OBJ(cx, obj);
+ scope = js_GetMutableScope(cx, obj);
+ if (!scope) {
+ sprop = NULL;
+ } else {
+ /*
+ * Handle old bug that took empty string as zero index. Also convert
+ * string indices to integers if appropriate.
+ */
+ CHECK_FOR_STRING_INDEX(id);
+ sprop = js_AddScopeProperty(cx, scope, id, getter, setter, slot, attrs,
+ flags, shortid);
+ }
+ JS_UNLOCK_OBJ(cx, obj);
+ return sprop;
+ }
+
+ JSScopeProperty *
+ js_ChangeNativePropertyAttrs(JSContext *cx, JSObject *obj,
+ JSScopeProperty *sprop, uintN attrs, uintN mask,
+ JSPropertyOp getter, JSPropertyOp setter)
+ {
+ JSScope *scope;
+
+ JS_LOCK_OBJ(cx, obj);
+ scope = js_GetMutableScope(cx, obj);
+ if (!scope) {
+ sprop = NULL;
+ } else {
+ sprop = js_ChangeScopePropertyAttrs(cx, scope, sprop, attrs, mask,
+ getter, setter);
+ if (sprop) {
+ PROPERTY_CACHE_FILL(&cx->runtime->propertyCache, obj, sprop->id,
+ sprop);
+ }
+ }
+ JS_UNLOCK_OBJ(cx, obj);
+ return sprop;
+ }
+
+ JSBool
+ js_DefineProperty(JSContext *cx, JSObject *obj, jsid id, jsval value,
+ JSPropertyOp getter, JSPropertyOp setter, uintN attrs,
+ JSProperty **propp)
+ {
+ return js_DefineNativeProperty(cx, obj, id, value, getter, setter, attrs,
+ 0, 0, propp);
+ }
+
+ /*
+ * Backward compatibility requires allowing addProperty hooks to mutate the
+ * nominal initial value of a slot-full property, while GC safety wants that
+ * value to be stored before the call-out through the hook. Optimize to do
+ * both while saving cycles for classes that stub their addProperty hook.
+ */
+ #define ADD_PROPERTY_HELPER(cx,clasp,obj,scope,sprop,vp,cleanup) \
+ JS_BEGIN_MACRO \
+ if ((clasp)->addProperty != JS_PropertyStub) { \
+ jsval nominal_ = *(vp); \
+ if (!(clasp)->addProperty(cx, obj, SPROP_USERID(sprop), vp)) { \
+ cleanup; \
+ } \
+ if (*(vp) != nominal_) { \
+ if (SPROP_HAS_VALID_SLOT(sprop, scope)) \
+ LOCKED_OBJ_SET_SLOT(obj, (sprop)->slot, *(vp)); \
+ } \
+ } \
+ JS_END_MACRO
+
+ JSBool
+ js_DefineNativeProperty(JSContext *cx, JSObject *obj, jsid id, jsval value,
+ JSPropertyOp getter, JSPropertyOp setter, uintN attrs,
+ uintN flags, intN shortid, JSProperty **propp)
+ {
+ JSClass *clasp;
+ JSScope *scope;
+ JSProperty *prop;
+ JSScopeProperty *sprop;
+
+ /*
+ * Handle old bug that took empty string as zero index. Also convert
+ * string indices to integers if appropriate.
+ */
+ CHECK_FOR_STRING_INDEX(id);
+
+ #if JS_HAS_GETTER_SETTER
+ /*
+ * If defining a getter or setter, we must check for its counterpart and
+ * update the attributes and property ops. A getter or setter is really
+ * only half of a property.
+ */
+ if (attrs & (JSPROP_GETTER | JSPROP_SETTER)) {
+ JSObject *pobj;
+
+ /*
+ * If JS_THREADSAFE and id is found, js_LookupProperty returns with
+ * sprop non-null and pobj locked. If pobj == obj, the property is
+ * already in obj and obj has its own (mutable) scope. So if we are
+ * defining a getter whose setter was already defined, or vice versa,
+ * finish the job via js_ChangeScopePropertyAttributes, and refresh
+ * the property cache line for (obj, id) to map sprop.
+ */
+ if (!js_LookupProperty(cx, obj, id, &pobj, &prop))
+ return JS_FALSE;
+ sprop = (JSScopeProperty *) prop;
+ if (sprop &&
+ pobj == obj &&
+ (sprop->attrs & (JSPROP_GETTER | JSPROP_SETTER))) {
+ sprop = js_ChangeScopePropertyAttrs(cx, OBJ_SCOPE(obj), sprop,
+ attrs, sprop->attrs,
+ (attrs & JSPROP_GETTER)
+ ? getter
+ : sprop->getter,
+ (attrs & JSPROP_SETTER)
+ ? setter
+ : sprop->setter);
+
+ /* NB: obj == pobj, so we can share unlock code at the bottom. */
+ if (!sprop)
+ goto bad;
+ goto out;
+ }
+
+ if (prop) {
+ /* NB: call OBJ_DROP_PROPERTY, as pobj might not be native. */
+ OBJ_DROP_PROPERTY(cx, pobj, prop);
+ prop = NULL;
+ }
+ }
+ #endif /* JS_HAS_GETTER_SETTER */
+
+ /* Lock if object locking is required by this implementation. */
+ JS_LOCK_OBJ(cx, obj);
+
+ /* Use the object's class getter and setter by default. */
+ clasp = LOCKED_OBJ_GET_CLASS(obj);
+ if (!getter)
+ getter = clasp->getProperty;
+ if (!setter)
+ setter = clasp->setProperty;
+
+ /* Get obj's own scope if it has one, or create a new one for obj. */
+ scope = js_GetMutableScope(cx, obj);
+ if (!scope)
+ goto bad;
+
+ /* Add the property to scope, or replace an existing one of the same id. */
+ if (clasp->flags & JSCLASS_SHARE_ALL_PROPERTIES)
+ attrs |= JSPROP_SHARED;
+ sprop = js_AddScopeProperty(cx, scope, id, getter, setter,
+ SPROP_INVALID_SLOT, attrs, flags, shortid);
+ if (!sprop)
+ goto bad;
+
+ /* Store value before calling addProperty, in case the latter GC's. */
+ if (SPROP_HAS_VALID_SLOT(sprop, scope))
+ LOCKED_OBJ_SET_SLOT(obj, sprop->slot, value);
+
+ /* XXXbe called with lock held */
+ ADD_PROPERTY_HELPER(cx, clasp, obj, scope, sprop, &value,
+ js_RemoveScopeProperty(cx, scope, id);
+ goto bad);
+
+ #if JS_HAS_GETTER_SETTER
+ out:
+ #endif
+ PROPERTY_CACHE_FILL(&cx->runtime->propertyCache, obj, id, sprop);
+ if (propp)
+ *propp = (JSProperty *) sprop;
+ else
+ JS_UNLOCK_OBJ(cx, obj);
+ return JS_TRUE;
+
+ bad:
+ JS_UNLOCK_OBJ(cx, obj);
+ return JS_FALSE;
+ }
+
+ /*
+ * Given pc pointing after a property accessing bytecode, return true if the
+ * access is a "object-detecting" in the sense used by web pages, e.g., when
+ * checking whether document.all is defined.
+ */
+ static JSBool
+ Detecting(JSContext *cx, jsbytecode *pc)
+ {
+ JSScript *script;
+ jsbytecode *endpc;
+ JSOp op;
+ JSAtom *atom;
+
+ if (!cx->fp)
+ return JS_FALSE;
+ script = cx->fp->script;
+ for (endpc = script->code + script->length; pc < endpc; pc++) {
+ /* General case: a branch or equality op follows the access. */
+ op = (JSOp) *pc;
+ if (js_CodeSpec[op].format & JOF_DETECTING)
+ return JS_TRUE;
+
+ /*
+ * Special case #1: handle (document.all == null). Don't sweat about
+ * JS1.2's revision of the equality operators here.
+ */
+ if (op == JSOP_NULL) {
+ if (++pc < endpc)
+ return *pc == JSOP_EQ || *pc == JSOP_NE;
+ break;
+ }
+
+ /*
+ * Special case #2: handle (document.all == undefined). Don't worry
+ * about someone redefining undefined, which was added by Edition 3,
+ * so was read/write for backward compatibility.
+ */
+ if (op == JSOP_NAME) {
+ atom = GET_ATOM(cx, script, pc);
+ if (atom == cx->runtime->atomState.typeAtoms[JSTYPE_VOID] &&
+ (pc += js_CodeSpec[op].length) < endpc) {
+ op = (JSOp) *pc;
+ return op == JSOP_EQ || op == JSOP_NE ||
+ op == JSOP_NEW_EQ || op == JSOP_NEW_NE;
+ }
+ break;
+ }
+
+ /* At this point, anything but grouping means we're not detecting. */
+ if (op != JSOP_GROUP)
+ break;
+ }
+ return JS_FALSE;
+ }
+
+ JS_FRIEND_API(JSBool)
+ js_LookupProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
+ JSProperty **propp)
+ {
+ return js_LookupPropertyWithFlags(cx, obj, id, 0, objp, propp);
+ }
+
+ JSBool
+ js_LookupPropertyWithFlags(JSContext *cx, JSObject *obj, jsid id, uintN flags,
+ JSObject **objp, JSProperty **propp)
+ {
+ JSObject *start, *obj2, *proto;
+ JSScope *scope;
+ JSScopeProperty *sprop;
+ JSClass *clasp;
+ JSResolveOp resolve;
+ JSResolvingKey key;
+ JSResolvingEntry *entry;
+ uint32 generation;
+ JSNewResolveOp newresolve;
+ jsbytecode *pc;
+ const JSCodeSpec *cs;
+ uint32 format;
+ JSBool ok;
+
+ /*
+ * Handle old bug that took empty string as zero index. Also convert
+ * string indices to integers if appropriate.
+ */
+ CHECK_FOR_STRING_INDEX(id);
+
+ /* Search scopes starting with obj and following the prototype link. */
+ start = obj;
+ for (;;) {
+ JS_LOCK_OBJ(cx, obj);
+ scope = OBJ_SCOPE(obj);
+ if (scope->object == obj) {
+ sprop = SCOPE_GET_PROPERTY(scope, id);
+ } else {
+ /* Shared prototype scope: try resolve before lookup. */
+ sprop = NULL;
+ }
+
+ /* Try obj's class resolve hook if id was not found in obj's scope. */
+ if (!sprop) {
+ clasp = LOCKED_OBJ_GET_CLASS(obj);
+ resolve = clasp->resolve;
+ if (resolve != JS_ResolveStub) {
+ /* Avoid recursion on (obj, id) already being resolved on cx. */
+ key.obj = obj;
+ key.id = id;
+
+ /*
+ * Once we have successfully added an entry for (obj, key) to
+ * cx->resolvingTable, control must go through cleanup: before
+ * returning. But note that JS_DHASH_ADD may find an existing
+ * entry, in which case we bail to suppress runaway recursion.
+ */
+ if (!js_StartResolving(cx, &key, JSRESFLAG_LOOKUP, &entry)) {
+ JS_UNLOCK_OBJ(cx, obj);
+ return JS_FALSE;
+ }
+ if (!entry) {
+ /* Already resolving id in obj -- dampen recursion. */
+ JS_UNLOCK_OBJ(cx, obj);
+ goto out;
+ }
+ generation = cx->resolvingTable->generation;
+
+ /* Null *propp here so we can test it at cleanup: safely. */
+ *propp = NULL;
+
+ if (clasp->flags & JSCLASS_NEW_RESOLVE) {
+ newresolve = (JSNewResolveOp)resolve;
+ if (!(flags & JSRESOLVE_CLASSNAME) &&
+ cx->fp &&
+ (pc = cx->fp->pc)) {
+ cs = &js_CodeSpec[*pc];
+ format = cs->format;
+ if ((format & JOF_MODEMASK) != JOF_NAME)
+ flags |= JSRESOLVE_QUALIFIED;
+ if ((format & JOF_ASSIGNING) ||
+ (cx->fp->flags & JSFRAME_ASSIGNING)) {
+ flags |= JSRESOLVE_ASSIGNING;
+ } else {
+ pc += cs->length;
+ if (Detecting(cx, pc))
+ flags |= JSRESOLVE_DETECTING;
+ }
+ if (format & JOF_DECLARING)
+ flags |= JSRESOLVE_DECLARING;
+ }
+ obj2 = (clasp->flags & JSCLASS_NEW_RESOLVE_GETS_START)
+ ? start
+ : NULL;
+ JS_UNLOCK_OBJ(cx, obj);
+
+ /* Protect id and all atoms from a GC nested in resolve. */
+ JS_KEEP_ATOMS(cx->runtime);
+ ok = newresolve(cx, obj, ID_TO_VALUE(id), flags, &obj2);
+ JS_UNKEEP_ATOMS(cx->runtime);
+ if (!ok)
+ goto cleanup;
+
+ JS_LOCK_OBJ(cx, obj);
+ if (obj2) {
+ /* Resolved: juggle locks and lookup id again. */
+ if (obj2 != obj) {
+ JS_UNLOCK_OBJ(cx, obj);
+ JS_LOCK_OBJ(cx, obj2);
+ }
+ scope = OBJ_SCOPE(obj2);
+ if (!MAP_IS_NATIVE(&scope->map)) {
+ /* Whoops, newresolve handed back a foreign obj2. */
+ JS_ASSERT(obj2 != obj);
+ JS_UNLOCK_OBJ(cx, obj2);
+ ok = OBJ_LOOKUP_PROPERTY(cx, obj2, id, objp, propp);
+ if (!ok || *propp)
+ goto cleanup;
+ JS_LOCK_OBJ(cx, obj2);
+ } else {
+ /*
+ * Require that obj2 have its own scope now, as we
+ * do for old-style resolve. If it doesn't, then
+ * id was not truly resolved, and we'll find it in
+ * the proto chain, or miss it if obj2's proto is
+ * not on obj's proto chain. That last case is a
+ * "too bad!" case.
+ */
+ if (scope->object == obj2)
+ sprop = SCOPE_GET_PROPERTY(scope, id);
+ }
+ if (sprop) {
+ JS_ASSERT(obj2 == scope->object);
+ obj = obj2;
+ } else if (obj2 != obj) {
+ JS_UNLOCK_OBJ(cx, obj2);
+ JS_LOCK_OBJ(cx, obj);
+ }
+ }
+ } else {
+ /*
+ * Old resolve always requires id re-lookup if obj owns
+ * its scope after resolve returns.
+ */
+ JS_UNLOCK_OBJ(cx, obj);
+ ok = resolve(cx, obj, ID_TO_VALUE(id));
+ if (!ok)
+ goto cleanup;
+ JS_LOCK_OBJ(cx, obj);
+ scope = OBJ_SCOPE(obj);
+ JS_ASSERT(MAP_IS_NATIVE(&scope->map));
+ if (scope->object == obj)
+ sprop = SCOPE_GET_PROPERTY(scope, id);
+ }
+
+ cleanup:
+ js_StopResolving(cx, &key, JSRESFLAG_LOOKUP, entry, generation);
+ if (!ok || *propp)
+ return ok;
+ }
+ }
+
+ if (sprop) {
+ JS_ASSERT(OBJ_SCOPE(obj) == scope);
+ *objp = scope->object; /* XXXbe hide in jsscope.[ch] */
+
+ *propp = (JSProperty *) sprop;
+ return JS_TRUE;
+ }
+
+ proto = LOCKED_OBJ_GET_PROTO(obj);
+ JS_UNLOCK_OBJ(cx, obj);
+ if (!proto)
+ break;
+ if (!OBJ_IS_NATIVE(proto))
+ return OBJ_LOOKUP_PROPERTY(cx, proto, id, objp, propp);
+ obj = proto;
+ }
+
+ out:
+ *objp = NULL;
+ *propp = NULL;
+ return JS_TRUE;
+ }
+
+ JS_FRIEND_API(JSBool)
+ js_FindProperty(JSContext *cx, jsid id, JSObject **objp, JSObject **pobjp,
+ JSProperty **propp)
+ {
+ JSRuntime *rt;
+ JSObject *obj, *pobj, *lastobj;
+ JSScopeProperty *sprop;
+ JSProperty *prop;
+
+ rt = cx->runtime;
+ obj = cx->fp->scopeChain;
+ do {
+ /* Try the property cache and return immediately on cache hit. */
+ if (OBJ_IS_NATIVE(obj)) {
+ JS_LOCK_OBJ(cx, obj);
+ PROPERTY_CACHE_TEST(&rt->propertyCache, obj, id, sprop);
+ if (sprop) {
+ JS_ASSERT(OBJ_IS_NATIVE(obj));
+ *objp = obj;
+ *pobjp = obj;
+ *propp = (JSProperty *) sprop;
+ return JS_TRUE;
+ }
+ JS_UNLOCK_OBJ(cx, obj);
+ }
+
+ /* If cache miss, take the slow path. */
+ if (!OBJ_LOOKUP_PROPERTY(cx, obj, id, &pobj, &prop))
+ return JS_FALSE;
+ if (prop) {
+ if (OBJ_IS_NATIVE(pobj)) {
+ sprop = (JSScopeProperty *) prop;
+ PROPERTY_CACHE_FILL(&rt->propertyCache, pobj, id, sprop);
+ }
+ *objp = obj;
+ *pobjp = pobj;
+ *propp = prop;
+ return JS_TRUE;
+ }
+ lastobj = obj;
+ } while ((obj = OBJ_GET_PARENT(cx, obj)) != NULL);
+
+ *objp = lastobj;
+ *pobjp = NULL;
+ *propp = NULL;
+ return JS_TRUE;
+ }
+
+ JSObject *
+ js_FindIdentifierBase(JSContext *cx, jsid id)
+ {
+ JSObject *obj, *pobj;
+ JSProperty *prop;
+
+ /*
+ * Look for id's property along the "with" statement chain and the
+ * statically-linked scope chain.
+ */
+ if (!js_FindProperty(cx, id, &obj, &pobj, &prop))
+ return NULL;
+ if (prop) {
+ OBJ_DROP_PROPERTY(cx, pobj, prop);
+ return obj;
+ }
+
+ /*
+ * Use the top-level scope from the scope chain, which won't end in the
+ * same scope as cx->globalObject for cross-context function calls.
+ */
+ JS_ASSERT(obj);
+
+ /*
+ * Property not found. Give a strict warning if binding an undeclared
+ * top-level variable.
+ */
+ if (JS_HAS_STRICT_OPTION(cx)) {
+ JSString *str = JSVAL_TO_STRING(ID_TO_VALUE(id));
+ if (!JS_ReportErrorFlagsAndNumber(cx,
+ JSREPORT_WARNING | JSREPORT_STRICT,
+ js_GetErrorMessage, NULL,
+ JSMSG_UNDECLARED_VAR,
+ JS_GetStringBytes(str))) {
+ return NULL;
+ }
+ }
+ return obj;
+ }
+
+ JSBool
+ js_GetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
+ {
+ JSObject *obj2;
+ JSProperty *prop;
+ JSScope *scope;
+ JSScopeProperty *sprop;
+ uint32 slot;
+
+ /*
+ * Handle old bug that took empty string as zero index. Also convert
+ * string indices to integers if appropriate.
+ */
+ CHECK_FOR_STRING_INDEX(id);
+
+ if (!js_LookupProperty(cx, obj, id, &obj2, &prop))
+ return JS_FALSE;
+ if (!prop) {
+ jsval default_val;
+
+ #if JS_BUG_NULL_INDEX_PROPS
+ /* Indexed properties defaulted to null in old versions. */
+ default_val = (JSID_IS_INT(id) && JSID_TO_INT(id) >= 0)
+ ? JSVAL_NULL
+ : JSVAL_VOID;
+ #else
+ default_val = JSVAL_VOID;
+ #endif
+ *vp = default_val;
+
+ if (!OBJ_GET_CLASS(cx, obj)->getProperty(cx, obj, ID_TO_VALUE(id), vp))
+ return JS_FALSE;
+
+ /*
+ * Give a strict warning if foo.bar is evaluated by a script for an
+ * object foo with no property named 'bar'.
+ */
+ if (JS_HAS_STRICT_OPTION(cx) &&
+ *vp == default_val &&
+ cx->fp && cx->fp->pc &&
+ (*cx->fp->pc == JSOP_GETPROP || *cx->fp->pc == JSOP_GETELEM))
+ {
+ jsbytecode *pc;
+ JSString *str;
+
+ /* Kludge to allow (typeof foo == "undefined") tests. */
+ JS_ASSERT(cx->fp->script);
+ pc = cx->fp->pc;
+ pc += js_CodeSpec[*pc].length;
+ if (Detecting(cx, pc))
+ return JS_TRUE;
+
+ /* Ok, bad undefined property reference: whine about it. */
+ str = js_DecompileValueGenerator(cx, JSDVG_IGNORE_STACK,
+ ID_TO_VALUE(id), NULL);
+ if (!str ||
+ !JS_ReportErrorFlagsAndNumber(cx,
+ JSREPORT_WARNING|JSREPORT_STRICT,
+ js_GetErrorMessage, NULL,
+ JSMSG_UNDEFINED_PROP,
+ JS_GetStringBytes(str))) {
+ return JS_FALSE;
+ }
+ }
+ return JS_TRUE;
+ }
+
+ if (!OBJ_IS_NATIVE(obj2)) {
+ OBJ_DROP_PROPERTY(cx, obj2, prop);
+ return OBJ_GET_PROPERTY(cx, obj2, id, vp);
+ }
+
+ /* Unlock obj2 before calling getter, relock after to avoid deadlock. */
+ scope = OBJ_SCOPE(obj2);
+ sprop = (JSScopeProperty *) prop;
+ slot = sprop->slot;
+ if (slot != SPROP_INVALID_SLOT) {
+ JS_ASSERT(slot < obj2->map->freeslot);
+ *vp = LOCKED_OBJ_GET_SLOT(obj2, slot);
+
+ /* If sprop has a stub getter, we're done. */
+ if (!sprop->getter)
+ goto out;
+ } else {
+ *vp = JSVAL_VOID;
+ }
+
+ JS_UNLOCK_SCOPE(cx, scope);
+ if (!SPROP_GET(cx, sprop, obj, obj2, vp))
+ return JS_FALSE;
+ JS_LOCK_SCOPE(cx, scope);
+
+ if (SPROP_HAS_VALID_SLOT(sprop, scope)) {
+ LOCKED_OBJ_SET_SLOT(obj2, slot, *vp);
+ PROPERTY_CACHE_FILL(&cx->runtime->propertyCache, obj2, id, sprop);
+ }
+
+ out:
+ JS_UNLOCK_SCOPE(cx, scope);
+ return JS_TRUE;
+ }
+
+ JSBool
+ js_SetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
+ {
+ JSObject *pobj;
+ JSProperty *prop;
+ JSScopeProperty *sprop;
+ JSScope *scope;
+ uintN attrs, flags;
+ intN shortid;
+ JSClass *clasp;
+ JSPropertyOp getter, setter;
+ jsval pval;
+ uint32 slot;
+
+ /*
+ * Handle old bug that took empty string as zero index. Also convert
+ * string indices to integers if appropriate.
+ */
+ CHECK_FOR_STRING_INDEX(id);
+
+ if (!js_LookupProperty(cx, obj, id, &pobj, &prop))
+ return JS_FALSE;
+
+ if (prop && !OBJ_IS_NATIVE(pobj)) {
+ OBJ_DROP_PROPERTY(cx, pobj, prop);
+ prop = NULL;
+ }
+ sprop = (JSScopeProperty *) prop;
+
+ /*
+ * Now either sprop is null, meaning id was not found in obj or one of its
+ * prototypes; or sprop is non-null, meaning id was found in pobj's scope.
+ * If JS_THREADSAFE and sprop is non-null, then scope is locked, and sprop
+ * is held: we must OBJ_DROP_PROPERTY or JS_UNLOCK_SCOPE before we return
+ * (the two are equivalent for native objects, but we use JS_UNLOCK_SCOPE
+ * because it is cheaper).
+ */
+ attrs = JSPROP_ENUMERATE;
+ flags = 0;
+ shortid = 0;
+ clasp = OBJ_GET_CLASS(cx, obj);
+ getter = clasp->getProperty;
+ setter = clasp->setProperty;
+
+ if (sprop) {
+ /*
+ * Set scope for use below. It was locked by js_LookupProperty, and
+ * we know pobj owns it (i.e., scope->object == pobj). Therefore we
+ * optimize JS_UNLOCK_OBJ(cx, pobj) into JS_UNLOCK_SCOPE(cx, scope).
+ */
+ scope = OBJ_SCOPE(pobj);
+
+ attrs = sprop->attrs;
+ if ((attrs & JSPROP_READONLY) ||
+ (SCOPE_IS_SEALED(scope) && pobj == obj)) {
+ JS_UNLOCK_SCOPE(cx, scope);
+
+ /*
+ * Here, we'll either return true or goto read_only_error, which
+ * reports a strict warning or throws an error. So we redefine
+ * the |flags| local variable to be JSREPORT_* flags to pass to
+ * JS_ReportErrorFlagsAndNumberUC at label read_only_error. We
+ * must likewise re-task flags further below for the other 'goto
+ * read_only_error;' case.
+ */
+ flags = JSREPORT_ERROR;
+ if ((attrs & JSPROP_READONLY) && JS_VERSION_IS_ECMA(cx)) {
+ if (!JS_HAS_STRICT_OPTION(cx)) {
+ /* Just return true per ECMA if not in strict mode. */
+ return JS_TRUE;
+ }
+
+ /* Strict mode: report a read-only strict warning. */
+ flags = JSREPORT_STRICT | JSREPORT_WARNING;
+ }
+ goto read_only_error;
+ }
+
+ if (pobj != obj) {
+ /*
+ * We found id in a prototype object: prepare to share or shadow.
+ * NB: Thanks to the immutable, garbage-collected property tree
+ * maintained by jsscope.c in cx->runtime, we needn't worry about
+ * sprop going away behind our back after we've unlocked scope.
+ */
+ JS_UNLOCK_SCOPE(cx, scope);
+
+ /* Don't clone a shared prototype property. */
+ if (attrs & JSPROP_SHARED)
+ return SPROP_SET(cx, sprop, obj, pobj, vp);
+
+ /* Restore attrs to the ECMA default for new properties. */
+ attrs = JSPROP_ENUMERATE;
+
+ /*
+ * Preserve the shortid, getter, and setter when shadowing any
+ * property that has a shortid. An old API convention requires
+ * that the property's getter and setter functions receive the
+ * shortid, not id, when they are called on the shadow we are
+ * about to create in obj's scope.
+ */
+ if (sprop->flags & SPROP_HAS_SHORTID) {
+ flags = SPROP_HAS_SHORTID;
+ shortid = sprop->shortid;
+ getter = sprop->getter;
+ setter = sprop->setter;
+ }
+
+ /*
+ * Forget we found the proto-property now that we've copied any
+ * needed member values.
+ */
+ sprop = NULL;
+ }
+ #ifdef __GNUC__ /* suppress bogus gcc warnings */
+ } else {
+ scope = NULL;
+ #endif
+ }
+
+ if (!sprop) {
+ if (SCOPE_IS_SEALED(OBJ_SCOPE(obj)) && OBJ_SCOPE(obj)->object == obj) {
+ flags = JSREPORT_ERROR;
+ goto read_only_error;
+ }
+
+ /* Find or make a property descriptor with the right heritage. */
+ JS_LOCK_OBJ(cx, obj);
+ scope = js_GetMutableScope(cx, obj);
+ if (!scope) {
+ JS_UNLOCK_OBJ(cx, obj);
+ return JS_FALSE;
+ }
+ if (clasp->flags & JSCLASS_SHARE_ALL_PROPERTIES)
+ attrs |= JSPROP_SHARED;
+ sprop = js_AddScopeProperty(cx, scope, id, getter, setter,
+ SPROP_INVALID_SLOT, attrs, flags, shortid);
+ if (!sprop) {
+ JS_UNLOCK_SCOPE(cx, scope);
+ return JS_FALSE;
+ }
+
+ /*
+ * Initialize the new property value (passed to setter) to undefined.
+ * Note that we store before calling addProperty, to match the order
+ * in js_DefineNativeProperty.
+ */
+ if (SPROP_HAS_VALID_SLOT(sprop, scope))
+ LOCKED_OBJ_SET_SLOT(obj, sprop->slot, JSVAL_VOID);
+
+ /* XXXbe called with obj locked */
+ ADD_PROPERTY_HELPER(cx, clasp, obj, scope, sprop, vp,
+ js_RemoveScopeProperty(cx, scope, id);
+ JS_UNLOCK_SCOPE(cx, scope);
+ return JS_FALSE);
+
+ PROPERTY_CACHE_FILL(&cx->runtime->propertyCache, obj, id, sprop);
+ }
+
+ /* Get the current property value from its slot. */
+ slot = sprop->slot;
+ if (slot != SPROP_INVALID_SLOT) {
+ JS_ASSERT(slot < obj->map->freeslot);
+ pval = LOCKED_OBJ_GET_SLOT(obj, slot);
+
+ /* If sprop has a stub setter, keep scope locked and just store *vp. */
+ if (!sprop->setter)
+ goto set_slot;
+ }
+
+ /* Avoid deadlock by unlocking obj's scope while calling sprop's setter. */
+ JS_UNLOCK_SCOPE(cx, scope);
+
+ /* Let the setter modify vp before copying from it to obj->slots[slot]. */
+ if (!SPROP_SET(cx, sprop, obj, obj, vp))
+ return JS_FALSE;
+
+ /* Relock obj's scope until we are done with sprop. */
+ JS_LOCK_SCOPE(cx, scope);
+
+ /*
+ * Check whether sprop is still around (was not deleted), and whether it
+ * has a slot (it may never have had one, or we may have lost a race with
+ * someone who cleared scope).
+ */
+ if (SPROP_HAS_VALID_SLOT(sprop, scope)) {
+ set_slot:
+ GC_POKE(cx, pval);
+ LOCKED_OBJ_SET_SLOT(obj, slot, *vp);
+ }
+ JS_UNLOCK_SCOPE(cx, scope);
+ return JS_TRUE;
+
+ read_only_error: {
+ JSString *str = js_DecompileValueGenerator(cx,
+ JSDVG_IGNORE_STACK,
+ ID_TO_VALUE(id),
+ NULL);
+ if (!str)
+ return JS_FALSE;
+ return JS_ReportErrorFlagsAndNumberUC(cx, flags, js_GetErrorMessage,
+ NULL, JSMSG_READ_ONLY,
+ JS_GetStringChars(str));
+ }
+ }
+
+ JSBool
+ js_GetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop,
+ uintN *attrsp)
+ {
+ JSBool noprop, ok;
+ JSScopeProperty *sprop;
+
+ noprop = !prop;
+ if (noprop) {
+ if (!js_LookupProperty(cx, obj, id, &obj, &prop))
+ return JS_FALSE;
+ if (!prop) {
+ *attrsp = 0;
+ return JS_TRUE;
+ }
+ if (!OBJ_IS_NATIVE(obj)) {
+ ok = OBJ_GET_ATTRIBUTES(cx, obj, id, prop, attrsp);
+ OBJ_DROP_PROPERTY(cx, obj, prop);
+ return ok;
+ }
+ }
+ sprop = (JSScopeProperty *)prop;
+ *attrsp = sprop->attrs;
+ if (noprop)
+ OBJ_DROP_PROPERTY(cx, obj, prop);
+ return JS_TRUE;
+ }
+
+ JSBool
+ js_SetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop,
+ uintN *attrsp)
+ {
+ JSBool noprop, ok;
+ JSScopeProperty *sprop;
+
+ noprop = !prop;
+ if (noprop) {
+ if (!js_LookupProperty(cx, obj, id, &obj, &prop))
+ return JS_FALSE;
+ if (!prop)
+ return JS_TRUE;
+ if (!OBJ_IS_NATIVE(obj)) {
+ ok = OBJ_SET_ATTRIBUTES(cx, obj, id, prop, attrsp);
+ OBJ_DROP_PROPERTY(cx, obj, prop);
+ return ok;
+ }
+ }
+ sprop = (JSScopeProperty *)prop;
+ sprop = js_ChangeNativePropertyAttrs(cx, obj, sprop,
+ *attrsp &
+ ~(JSPROP_GETTER | JSPROP_SETTER), 0,
+ sprop->getter, sprop->setter);
+ if (noprop)
+ OBJ_DROP_PROPERTY(cx, obj, prop);
+ return (sprop != NULL);
+ }
+
+ JSBool
+ js_DeleteProperty(JSContext *cx, JSObject *obj, jsid id, jsval *rval)
+ {
+ #if JS_HAS_PROP_DELETE
+
+ JSObject *proto;
+ JSProperty *prop;
+ JSScopeProperty *sprop;
+ JSString *str;
+ JSScope *scope;
+ JSBool ok;
+
+ *rval = JS_VERSION_IS_ECMA(cx) ? JSVAL_TRUE : JSVAL_VOID;
+
+ /*
+ * Handle old bug that took empty string as zero index. Also convert
+ * string indices to integers if appropriate.
+ */
+ CHECK_FOR_STRING_INDEX(id);
+
+ if (!js_LookupProperty(cx, obj, id, &proto, &prop))
+ return JS_FALSE;
+ if (!prop || proto != obj) {
+ /*
+ * If the property was found in a native prototype, check whether it's
+ * shared and permanent. Such a property stands for direct properties
+ * in all delegating objects, matching ECMA semantics without bloating
+ * each delegating object.
+ */
+ if (prop) {
+ if (OBJ_IS_NATIVE(proto)) {
+ sprop = (JSScopeProperty *)prop;
+ if (SPROP_IS_SHARED_PERMANENT(sprop))
+ *rval = JSVAL_FALSE;
+ }
+ OBJ_DROP_PROPERTY(cx, proto, prop);
+ if (*rval == JSVAL_FALSE)
+ return JS_TRUE;
+ }
+
+ /*
+ * If no property, or the property comes unshared or impermanent from
+ * a prototype, call the class's delProperty hook, passing rval as the
+ * result parameter.
+ */
+ return OBJ_GET_CLASS(cx, obj)->delProperty(cx, obj, ID_TO_VALUE(id),
+ rval);
+ }
+
+ sprop = (JSScopeProperty *)prop;
+ if (sprop->attrs & JSPROP_PERMANENT) {
+ OBJ_DROP_PROPERTY(cx, obj, prop);
+ if (JS_VERSION_IS_ECMA(cx)) {
+ *rval = JSVAL_FALSE;
+ return JS_TRUE;
+ }
+ str = js_DecompileValueGenerator(cx, JSDVG_IGNORE_STACK,
+ ID_TO_VALUE(id), NULL);
+ if (str) {
+ JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
+ JSMSG_PERMANENT, JS_GetStringBytes(str));
+ }
+ return JS_FALSE;
+ }
+
+ /* XXXbe called with obj locked */
+ if (!LOCKED_OBJ_GET_CLASS(obj)->delProperty(cx, obj, SPROP_USERID(sprop),
+ rval)) {
+ OBJ_DROP_PROPERTY(cx, obj, prop);
+ return JS_FALSE;
+ }
+
+ scope = OBJ_SCOPE(obj);
+ if (SPROP_HAS_VALID_SLOT(sprop, scope))
+ GC_POKE(cx, LOCKED_OBJ_GET_SLOT(obj, sprop->slot));
+
+ PROPERTY_CACHE_FILL(&cx->runtime->propertyCache, obj, id, NULL);
+ ok = js_RemoveScopeProperty(cx, scope, id);
+ OBJ_DROP_PROPERTY(cx, obj, prop);
+ return ok;
+
+ #else /* !JS_HAS_PROP_DELETE */
+
+ jsval null = JSVAL_NULL;
+
+ *rval = JSVAL_VOID;
+ return js_SetProperty(cx, obj, id, &null);
+
+ #endif /* !JS_HAS_PROP_DELETE */
+ }
+
+ JSBool
+ js_DefaultValue(JSContext *cx, JSObject *obj, JSType hint, jsval *vp)
+ {
+ jsval v;
+ JSString *str;
+
+ v = OBJECT_TO_JSVAL(obj);
+ switch (hint) {
+ case JSTYPE_STRING:
+ /*
+ * Propagate the exception if js_TryMethod finds an appropriate
+ * method, and calling that method returned failure.
+ */
+ if (!js_TryMethod(cx, obj, cx->runtime->atomState.toStringAtom, 0, NULL,
+ &v)) {
+ return JS_FALSE;
+ }
+
+ if (!JSVAL_IS_PRIMITIVE(v)) {
+ if (!OBJ_GET_CLASS(cx, obj)->convert(cx, obj, hint, &v))
+ return JS_FALSE;
+
+ /*
+ * JS1.2 never failed (except for malloc failure) to convert an
+ * object to a string. ECMA requires an error if both toString
+ * and valueOf fail to produce a primitive value.
+ */
+ if (!JSVAL_IS_PRIMITIVE(v) && JS_VERSION_IS_1_2(cx)) {
+ char *bytes = JS_smprintf("[object %s]",
+ OBJ_GET_CLASS(cx, obj)->name);
+ if (!bytes)
+ return JS_FALSE;
+ str = JS_NewString(cx, bytes, strlen(bytes));
+ if (!str) {
+ free(bytes);
+ return JS_FALSE;
+ }
+ v = STRING_TO_JSVAL(str);
+ goto out;
+ }
+ }
+ break;
+
+ default:
+ if (!OBJ_GET_CLASS(cx, obj)->convert(cx, obj, hint, &v))
+ return JS_FALSE;
+ if (!JSVAL_IS_PRIMITIVE(v)) {
+ JSType type = JS_TypeOfValue(cx, v);
+ if (type == hint ||
+ (type == JSTYPE_FUNCTION && hint == JSTYPE_OBJECT)) {
+ goto out;
+ }
+ /* Don't convert to string (source object literal) for JS1.2. */
+ if (JS_VERSION_IS_1_2(cx) && hint == JSTYPE_BOOLEAN)
+ goto out;
+ if (!js_TryMethod(cx, obj, cx->runtime->atomState.toStringAtom, 0,
+ NULL, &v))
+ return JS_FALSE;
+ }
+ break;
+ }
+ if (!JSVAL_IS_PRIMITIVE(v)) {
+ /* Avoid recursive death through js_DecompileValueGenerator. */
+ if (hint == JSTYPE_STRING) {
+ str = JS_InternString(cx, OBJ_GET_CLASS(cx, obj)->name);
+ if (!str)
+ return JS_FALSE;
+ } else {
+ str = NULL;
+ }
+ *vp = OBJECT_TO_JSVAL(obj);
+ str = js_DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, v, str);
+ if (str) {
+ JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
+ JSMSG_CANT_CONVERT_TO,
+ JS_GetStringBytes(str),
+ (hint == JSTYPE_VOID)
+ ? "primitive type"
+ : js_type_str[hint]);
+ }
+ return JS_FALSE;
+ }
+ out:
+ *vp = v;
+ return JS_TRUE;
+ }
+
+ JSIdArray *
+ js_NewIdArray(JSContext *cx, jsint length)
+ {
+ JSIdArray *ida;
+
+ ida = (JSIdArray *)
+ JS_malloc(cx, sizeof(JSIdArray) + (length-1) * sizeof(jsval));
+ if (ida)
+ ida->length = length;
+ return ida;
+ }
+
+ JSIdArray *
+ js_SetIdArrayLength(JSContext *cx, JSIdArray *ida, jsint length)
+ {
+ JSIdArray *rida;
+
+ rida = (JSIdArray *)
+ JS_realloc(cx, ida, sizeof(JSIdArray) + (length-1) * sizeof(jsval));
+ if (!rida)
+ JS_DestroyIdArray(cx, ida);
+ else
+ rida->length = length;
+ return rida;
+ }
+
+ /* Private type used to iterate over all properties of a native JS object */
+ typedef struct JSNativeIteratorState {
+ jsint next_index; /* index into jsid array */
+ JSIdArray *ida; /* all property ids in enumeration */
+ } JSNativeIteratorState;
+
+ /*
+ * This function is used to enumerate the properties of native JSObjects
+ * and those host objects that do not define a JSNewEnumerateOp-style iterator
+ * function.
+ */
+ JSBool
+ js_Enumerate(JSContext *cx, JSObject *obj, JSIterateOp enum_op,
+ jsval *statep, jsid *idp)
+ {
+ JSObject *proto;
+ JSClass *clasp;
+ JSEnumerateOp enumerate;
+ JSScopeProperty *sprop, *lastProp;
+ jsint i, length;
+ JSScope *scope;
+ JSIdArray *ida;
+ JSNativeIteratorState *state;
+
+ clasp = OBJ_GET_CLASS(cx, obj);
+ enumerate = clasp->enumerate;
+ if (clasp->flags & JSCLASS_NEW_ENUMERATE)
+ return ((JSNewEnumerateOp) enumerate)(cx, obj, enum_op, statep, idp);
+
+ switch (enum_op) {
+ case JSENUMERATE_INIT:
+ if (!enumerate(cx, obj))
+ return JS_FALSE;
+ length = 0;
+
+ /*
+ * The set of all property ids is pre-computed when the iterator
+ * is initialized so as to avoid problems with properties being
+ * deleted during the iteration.
+ */
+ JS_LOCK_OBJ(cx, obj);
+ scope = OBJ_SCOPE(obj);
+
+ /*
+ * If this object shares a scope with its prototype, don't enumerate
+ * its properties. Otherwise they will be enumerated a second time
+ * when the prototype object is enumerated.
+ */
+ proto = OBJ_GET_PROTO(cx, obj);
+ if (proto && scope == OBJ_SCOPE(proto)) {
+ ida = js_NewIdArray(cx, 0);
+ if (!ida) {
+ JS_UNLOCK_OBJ(cx, obj);
+ return JS_FALSE;
+ }
+ } else {
+ /* Object has a private scope; Enumerate all props in scope. */
+ for (sprop = lastProp = SCOPE_LAST_PROP(scope); sprop;
+ sprop = sprop->parent) {
+ if ((
+ #ifdef DUMP_CALL_TABLE
+ (cx->options & JSOPTION_LOGCALL_TOSOURCE) ||
+ #endif
+ (sprop->attrs & JSPROP_ENUMERATE)) &&
+ !(sprop->flags & SPROP_IS_ALIAS) &&
+ (!SCOPE_HAD_MIDDLE_DELETE(scope) ||
+ SCOPE_HAS_PROPERTY(scope, sprop))) {
+ length++;
+ }
+ }
+ ida = js_NewIdArray(cx, length);
+ if (!ida) {
+ JS_UNLOCK_OBJ(cx, obj);
+ return JS_FALSE;
+ }
+ i = length;
+ for (sprop = lastProp; sprop; sprop = sprop->parent) {
+ if ((
+ #ifdef DUMP_CALL_TABLE
+ (cx->options & JSOPTION_LOGCALL_TOSOURCE) ||
+ #endif
+ (sprop->attrs & JSPROP_ENUMERATE)) &&
+ !(sprop->flags & SPROP_IS_ALIAS) &&
+ (!SCOPE_HAD_MIDDLE_DELETE(scope) ||
+ SCOPE_HAS_PROPERTY(scope, sprop))) {
+ JS_ASSERT(i > 0);
+ ida->vector[--i] = sprop->id;
+ }
+ }
+ }
+ JS_UNLOCK_OBJ(cx, obj);
+
+ state = (JSNativeIteratorState *)
+ JS_malloc(cx, sizeof(JSNativeIteratorState));
+ if (!state) {
+ JS_DestroyIdArray(cx, ida);
+ return JS_FALSE;
+ }
+ state->ida = ida;
+ state->next_index = 0;
+ *statep = PRIVATE_TO_JSVAL(state);
+ if (idp)
+ *idp = INT_TO_JSVAL(length);
+ break;
+
+ case JSENUMERATE_NEXT:
+ state = (JSNativeIteratorState *) JSVAL_TO_PRIVATE(*statep);
+ ida = state->ida;
+ length = ida->length;
+ if (state->next_index != length) {
+ *idp = ida->vector[state->next_index++];
+ break;
+ }
+ /* FALL THROUGH */
+
+ case JSENUMERATE_DESTROY:
+ state = (JSNativeIteratorState *) JSVAL_TO_PRIVATE(*statep);
+ JS_DestroyIdArray(cx, state->ida);
+ JS_free(cx, state);
+ *statep = JSVAL_NULL;
+ break;
+ }
+ return JS_TRUE;
+ }
+
+ JSBool
+ js_CheckAccess(JSContext *cx, JSObject *obj, jsid id, JSAccessMode mode,
+ jsval *vp, uintN *attrsp)
+ {
+ JSObject *pobj;
+ JSProperty *prop;
+ JSScopeProperty *sprop;
+ JSClass *clasp;
+ JSCheckAccessOp check;
+ JSBool ok;
+
+ if (!js_LookupProperty(cx, obj, id, &pobj, &prop))
+ return JS_FALSE;
+ if (!prop) {
+ *vp = JSVAL_VOID;
+ *attrsp = 0;
+ clasp = OBJ_GET_CLASS(cx, obj);
+ return !clasp->checkAccess ||
+ clasp->checkAccess(cx, obj, ID_TO_VALUE(id), mode, vp);
+ }
+ if (!OBJ_IS_NATIVE(pobj)) {
+ OBJ_DROP_PROPERTY(cx, pobj, prop);
+ return OBJ_CHECK_ACCESS(cx, pobj, id, mode, vp, attrsp);
+ }
+ sprop = (JSScopeProperty *)prop;
+ if (!(mode & JSACC_WRITE)) {
+ *vp = (SPROP_HAS_VALID_SLOT(sprop, OBJ_SCOPE(pobj)))
+ ? LOCKED_OBJ_GET_SLOT(pobj, sprop->slot)
+ : ((mode & JSACC_WATCH) == JSACC_PROTO)
+ ? LOCKED_OBJ_GET_SLOT(obj, JSSLOT_PROTO)
+ : (mode == JSACC_PARENT)
+ ? LOCKED_OBJ_GET_SLOT(obj, JSSLOT_PARENT)
+ : JSVAL_VOID;
+ }
+ *attrsp = sprop->attrs;
+
+ /*
+ * If obj's class has a stub (null) checkAccess hook, use the per-runtime
+ * checkObjectAccess callback, if configured.
+ *
+ * We don't want to require all classes to supply a checkAccess hook; we
+ * need that hook only for certain classes used when precompiling scripts
+ * and functions ("brutal sharing"). But for general safety of built-in
+ * magic properties such as __proto__ and __parent__, we route all access
+ * checks, even for classes that stub out checkAccess, through the global
+ * checkObjectAccess hook. This covers precompilation-based sharing and
+ * (possibly unintended) runtime sharing across trust boundaries.
+ */
+ clasp = LOCKED_OBJ_GET_CLASS(pobj);
+ check = clasp->checkAccess;
+ if (!check)
+ check = cx->runtime->checkObjectAccess;
+ if (check) {
+ JS_UNLOCK_OBJ(cx, pobj);
+ ok = check(cx, pobj, ID_TO_VALUE(id), mode, vp);
+ JS_LOCK_OBJ(cx, pobj);
+ } else {
+ ok = JS_TRUE;
+ }
+ OBJ_DROP_PROPERTY(cx, pobj, prop);
+ return ok;
+ }
+
+ #ifdef JS_THREADSAFE
+ void
+ js_DropProperty(JSContext *cx, JSObject *obj, JSProperty *prop)
+ {
+ JS_UNLOCK_OBJ(cx, obj);
+ }
+ #endif
+
+ static void
+ ReportIsNotFunction(JSContext *cx, jsval *vp, uintN flags)
+ {
+ /*
+ * The decompiler may need to access the args of the function in
+ * progress rather than the one we had hoped to call.
+ * So we switch the cx->fp to the frame below us. We stick the
+ * current frame in the dormantFrameChain to protect it from gc.
+ */
+
+ JSStackFrame *fp = cx->fp;
+ if (fp->down) {
+ JS_ASSERT(!fp->dormantNext);
+ fp->dormantNext = cx->dormantFrameChain;
+ cx->dormantFrameChain = fp;
+ cx->fp = fp->down;
+ }
+
+ js_ReportIsNotFunction(cx, vp, flags);
+
+ if (fp->down) {
+ JS_ASSERT(cx->dormantFrameChain == fp);
+ cx->dormantFrameChain = fp->dormantNext;
+ fp->dormantNext = NULL;
+ cx->fp = fp;
+ }
+ }
+
+ #ifdef NARCISSUS
+ static JSBool
+ GetCurrentExecutionContext(JSContext *cx, JSObject *obj, jsval *rval)
+ {
+ JSObject *tmp;
+ jsval xcval;
+
+ while ((tmp = OBJ_GET_PARENT(cx, obj)) != NULL)
+ obj = tmp;
+ if (!OBJ_GET_PROPERTY(cx, obj,
+ ATOM_TO_JSID(cx->runtime->atomState
+ .ExecutionContextAtom),
+ &xcval)) {
+ return JS_FALSE;
+ }
+ if (JSVAL_IS_PRIMITIVE(xcval)) {
+ JS_ReportError(cx, "invalid ExecutionContext in global object");
+ return JS_FALSE;
+ }
+ if (!OBJ_GET_PROPERTY(cx, JSVAL_TO_OBJECT(xcval),
+ ATOM_TO_JSID(cx->runtime->atomState.currentAtom),
+ rval)) {
+ return JS_FALSE;
+ }
+ return JS_TRUE;
+ }
+ #endif
+
+ JSBool
+ js_Call(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
+ {
+ JSClass *clasp;
+
+ clasp = OBJ_GET_CLASS(cx, JSVAL_TO_OBJECT(argv[-2]));
+ if (!clasp->call) {
+ #ifdef NARCISSUS
+ JSObject *callee, *args;
+ jsval fval, nargv[3];
+ JSBool ok;
+
+ callee = JSVAL_TO_OBJECT(argv[-2]);
+ if (!OBJ_GET_PROPERTY(cx, callee,
+ ATOM_TO_JSID(cx->runtime->atomState.callAtom),
+ &fval)) {
+ return JS_FALSE;
+ }
+ if (JSVAL_IS_FUNCTION(cx, fval)) {
+ if (!GetCurrentExecutionContext(cx, obj, &nargv[2]))
+ return JS_FALSE;
+ args = js_GetArgsObject(cx, cx->fp);
+ if (!args)
+ return JS_FALSE;
+ nargv[0] = OBJECT_TO_JSVAL(obj);
+ nargv[1] = OBJECT_TO_JSVAL(args);
+ return js_InternalCall(cx, callee, fval, 3, nargv, rval);
+ }
+ if (JSVAL_IS_OBJECT(fval) && JSVAL_TO_OBJECT(fval) != callee) {
+ argv[-2] = fval;
+ ok = js_Call(cx, obj, argc, argv, rval);
+ argv[-2] = OBJECT_TO_JSVAL(callee);
+ return ok;
+ }
+ #endif
+ ReportIsNotFunction(cx, &argv[-2], 0);
+ return JS_FALSE;
+ }
+ return clasp->call(cx, obj, argc, argv, rval);
+ }
+
+ JSBool
+ js_Construct(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
+ jsval *rval)
+ {
+ JSClass *clasp;
+
+ clasp = OBJ_GET_CLASS(cx, JSVAL_TO_OBJECT(argv[-2]));
+ if (!clasp->construct) {
+ #ifdef NARCISSUS
+ JSObject *callee, *args;
+ jsval cval, nargv[2];
+ JSBool ok;
+
+ callee = JSVAL_TO_OBJECT(argv[-2]);
+ if (!OBJ_GET_PROPERTY(cx, callee,
+ ATOM_TO_JSID(cx->runtime->atomState
+ .constructAtom),
+ &cval)) {
+ return JS_FALSE;
+ }
+ if (JSVAL_IS_FUNCTION(cx, cval)) {
+ if (!GetCurrentExecutionContext(cx, obj, &nargv[1]))
+ return JS_FALSE;
+ args = js_GetArgsObject(cx, cx->fp);
+ if (!args)
+ return JS_FALSE;
+ nargv[0] = OBJECT_TO_JSVAL(args);
+ return js_InternalCall(cx, callee, cval, 2, nargv, rval);
+ }
+ if (JSVAL_IS_OBJECT(cval) && JSVAL_TO_OBJECT(cval) != callee) {
+ argv[-2] = cval;
+ ok = js_Call(cx, obj, argc, argv, rval);
+ argv[-2] = OBJECT_TO_JSVAL(callee);
+ return ok;
+ }
+ #endif
+ ReportIsNotFunction(cx, &argv[-2], JSV2F_CONSTRUCT);
+ return JS_FALSE;
+ }
+ return clasp->construct(cx, obj, argc, argv, rval);
+ }
+
+ JSBool
+ js_HasInstance(JSContext *cx, JSObject *obj, jsval v, JSBool *bp)
+ {
+ JSClass *clasp;
+ JSString *str;
+
+ clasp = OBJ_GET_CLASS(cx, obj);
+ if (clasp->hasInstance)
+ return clasp->hasInstance(cx, obj, v, bp);
+ #ifdef NARCISSUS
+ {
+ jsval fval, rval;
+
+ if (!OBJ_GET_PROPERTY(cx, obj,
+ ATOM_TO_JSID(cx->runtime->atomState
+ .hasInstanceAtom),
+ &fval)) {
+ return JS_FALSE;
+ }
+ if (JSVAL_IS_FUNCTION(cx, fval)) {
+ return js_InternalCall(cx, obj, fval, 1, &v, &rval) &&
+ js_ValueToBoolean(cx, rval, bp);
+ }
+ }
+ #endif
+ str = js_DecompileValueGenerator(cx, JSDVG_SEARCH_STACK,
+ OBJECT_TO_JSVAL(obj), NULL);
+ if (str) {
+ JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
+ JSMSG_BAD_INSTANCEOF_RHS,
+ JS_GetStringBytes(str));
+ }
+ return JS_FALSE;
+ }
+
+ JSBool
+ js_IsDelegate(JSContext *cx, JSObject *obj, jsval v, JSBool *bp)
+ {
+ JSObject *obj2;
+
+ *bp = JS_FALSE;
+ if (JSVAL_IS_PRIMITIVE(v))
+ return JS_TRUE;
+ obj2 = JSVAL_TO_OBJECT(v);
+ while ((obj2 = OBJ_GET_PROTO(cx, obj2)) != NULL) {
+ if (obj2 == obj) {
+ *bp = JS_TRUE;
+ break;
+ }
+ }
+ return JS_TRUE;
+ }
+
+ JSBool
+ js_GetClassPrototype(JSContext *cx, const char *name, JSObject **protop)
+ {
+ return GetClassPrototype(cx, NULL, name, protop);
+ }
+
+ static JSBool
+ GetClassPrototype(JSContext *cx, JSObject *scope, const char *name,
+ JSObject **protop)
+ {
+ jsval v;
+ JSObject *ctor;
+
+ if (!js_FindConstructor(cx, scope, name, &v))
+ return JS_FALSE;
+ if (JSVAL_IS_FUNCTION(cx, v)) {
+ ctor = JSVAL_TO_OBJECT(v);
+ if (!OBJ_GET_PROPERTY(cx, ctor,
+ ATOM_TO_JSID(cx->runtime->atomState
+ .classPrototypeAtom),
+ &v)) {
+ return JS_FALSE;
+ }
+ if (!JSVAL_IS_PRIMITIVE(v)) {
+ /*
+ * Set the newborn root in case v is otherwise unreferenced.
+ * It's ok to overwrite newborn roots here, since the getter
+ * called just above could have. Unlike the common GC rooting
+ * model, our callers do not have to protect protop thanks to
+ * this newborn root, since they all immediately create a new
+ * instance that delegates to this object, or just query the
+ * prototype for its class.
+ */
+ cx->newborn[GCX_OBJECT] = JSVAL_TO_GCTHING(v);
+ }
+ }
+ *protop = JSVAL_IS_OBJECT(v) ? JSVAL_TO_OBJECT(v) : NULL;
+ return JS_TRUE;
+ }
+
+ /*
+ * For shared precompilation of function objects, we support cloning on entry
+ * to an execution context in which the function declaration or expression
+ * should be processed as if it were not precompiled, where the precompiled
+ * function's scope chain does not match the execution context's. The cloned
+ * function object carries its execution-context scope in its parent slot; it
+ * links to the precompiled function (the "clone-parent") via its proto slot.
+ *
+ * Note that this prototype-based delegation leaves an unchecked access path
+ * from the clone to the clone-parent's 'constructor' property. If the clone
+ * lives in a less privileged or shared scope than the clone-parent, this is
+ * a security hole, a sharing hazard, or both. Therefore we check all such
+ * accesses with the following getter/setter pair, which we use when defining
+ * 'constructor' in f.prototype for all function objects f.
+ */
+ static JSBool
+ CheckCtorGetAccess(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
+ {
+ JSAtom *atom;
+ uintN attrs;
+
+ atom = cx->runtime->atomState.constructorAtom;
+ JS_ASSERT(id == ATOM_KEY(atom));
+ return OBJ_CHECK_ACCESS(cx, obj, ATOM_TO_JSID(atom), JSACC_READ,
+ vp, &attrs);
+ }
+
+ static JSBool
+ CheckCtorSetAccess(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
+ {
+ JSAtom *atom;
+ uintN attrs;
+
+ atom = cx->runtime->atomState.constructorAtom;
+ JS_ASSERT(id == ATOM_KEY(atom));
+ return OBJ_CHECK_ACCESS(cx, obj, ATOM_TO_JSID(atom), JSACC_WRITE,
+ vp, &attrs);
+ }
+
+ JSBool
+ js_SetClassPrototype(JSContext *cx, JSObject *ctor, JSObject *proto,
+ uintN attrs)
+ {
+ /*
+ * Use the given attributes for the prototype property of the constructor,
+ * as user-defined constructors have a DontDelete prototype (which may be
+ * reset), while native or "system" constructors have DontEnum | ReadOnly |
+ * DontDelete.
+ */
+ if (!OBJ_DEFINE_PROPERTY(cx, ctor,
+ ATOM_TO_JSID(cx->runtime->atomState
+ .classPrototypeAtom),
+ OBJECT_TO_JSVAL(proto),
+ JS_PropertyStub, JS_PropertyStub,
+ attrs, NULL)) {
+ return JS_FALSE;
+ }
+
+ /*
+ * ECMA says that Object.prototype.constructor, or f.prototype.constructor
+ * for a user-defined function f, is DontEnum.
+ */
+ return OBJ_DEFINE_PROPERTY(cx, proto,
+ ATOM_TO_JSID(cx->runtime->atomState
+ .constructorAtom),
+ OBJECT_TO_JSVAL(ctor),
+ CheckCtorGetAccess, CheckCtorSetAccess,
+ 0, NULL);
+ }
+
+ JSBool
+ js_ValueToObject(JSContext *cx, jsval v, JSObject **objp)
+ {
+ JSObject *obj;
+
+ if (JSVAL_IS_NULL(v) || JSVAL_IS_VOID(v)) {
+ obj = NULL;
+ } else if (JSVAL_IS_OBJECT(v)) {
+ obj = JSVAL_TO_OBJECT(v);
+ if (!OBJ_DEFAULT_VALUE(cx, obj, JSTYPE_OBJECT, &v))
+ return JS_FALSE;
+ if (JSVAL_IS_OBJECT(v))
+ obj = JSVAL_TO_OBJECT(v);
+ } else {
+ if (JSVAL_IS_STRING(v)) {
+ obj = js_StringToObject(cx, JSVAL_TO_STRING(v));
+ } else if (JSVAL_IS_INT(v)) {
+ obj = js_NumberToObject(cx, (jsdouble)JSVAL_TO_INT(v));
+ } else if (JSVAL_IS_DOUBLE(v)) {
+ obj = js_NumberToObject(cx, *JSVAL_TO_DOUBLE(v));
+ } else {
+ JS_ASSERT(JSVAL_IS_BOOLEAN(v));
+ obj = js_BooleanToObject(cx, JSVAL_TO_BOOLEAN(v));
+ }
+ if (!obj)
+ return JS_FALSE;
+ }
+ *objp = obj;
+ return JS_TRUE;
+ }
+
+ JSObject *
+ js_ValueToNonNullObject(JSContext *cx, jsval v)
+ {
+ JSObject *obj;
+ JSString *str;
+
+ if (!js_ValueToObject(cx, v, &obj))
+ return NULL;
+ if (!obj) {
+ str = js_DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, v, NULL);
+ if (str) {
+ JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
+ JSMSG_NO_PROPERTIES, JS_GetStringBytes(str));
+ }
+ }
+ return obj;
+ }
+
+ JSBool
+ js_TryValueOf(JSContext *cx, JSObject *obj, JSType type, jsval *rval)
+ {
+ #if JS_HAS_VALUEOF_HINT
+ jsval argv[1];
+
+ argv[0] = ATOM_KEY(cx->runtime->atomState.typeAtoms[type]);
+ return js_TryMethod(cx, obj, cx->runtime->atomState.valueOfAtom, 1, argv,
+ rval);
+ #else
+ return js_TryMethod(cx, obj, cx->runtime->atomState.valueOfAtom, 0, NULL,
+ rval);
+ #endif
+ }
+
+ JSBool
+ js_TryMethod(JSContext *cx, JSObject *obj, JSAtom *atom,
+ uintN argc, jsval *argv, jsval *rval)
+ {
+ JSErrorReporter older;
+ jsval fval;
+ JSBool ok;
+ int stackDummy;
+
+ if (!JS_CHECK_STACK_SIZE(cx, stackDummy)) {
+ JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_OVER_RECURSED);
+ return JS_FALSE;
+ }
+
+ /*
+ * Report failure only if an appropriate method was found, and calling it
+ * returned failure. We propagate failure in this case to make exceptions
+ * behave properly.
+ */
+ older = JS_SetErrorReporter(cx, NULL);
+ if (!OBJ_GET_PROPERTY(cx, obj, ATOM_TO_JSID(atom), &fval)) {
+ JS_ClearPendingException(cx);
+ ok = JS_TRUE;
+ } else if (!JSVAL_IS_PRIMITIVE(fval)) {
+ ok = js_InternalCall(cx, obj, fval, argc, argv, rval);
+ } else {
+ ok = JS_TRUE;
+ }
+ JS_SetErrorReporter(cx, older);
+ return ok;
+ }
+
+ #if JS_HAS_XDR
+
+ #include "jsxdrapi.h"
+
+ JSBool
+ js_XDRObject(JSXDRState *xdr, JSObject **objp)
+ {
+ JSContext *cx;
+ JSClass *clasp;
+ const char *className;
+ uint32 classId, classDef;
+ JSBool ok;
+ JSObject *proto;
+
+ cx = xdr->cx;
+ if (xdr->mode == JSXDR_ENCODE) {
+ clasp = OBJ_GET_CLASS(cx, *objp);
+ className = clasp->name;
+ classId = JS_XDRFindClassIdByName(xdr, className);
+ classDef = !classId;
+ if (classDef && !JS_XDRRegisterClass(xdr, clasp, &classId))
+ return JS_FALSE;
+ } else {
+ classDef = 0;
+ className = NULL;
+ clasp = NULL; /* quell GCC overwarning */
+ }
+
+ /* XDR a flag word followed (if true) by the class name. */
+ if (!JS_XDRUint32(xdr, &classDef))
+ return JS_FALSE;
+ if (classDef && !JS_XDRCString(xdr, (char **) &className))
+ return JS_FALSE;
+
+ /* From here on, return through out: to free className if it was set. */
+ ok = JS_XDRUint32(xdr, &classId);
+ if (!ok)
+ goto out;
+
+ if (xdr->mode != JSXDR_ENCODE) {
+ if (classDef) {
+ ok = GetClassPrototype(cx, NULL, className, &proto);
+ if (!ok)
+ goto out;
+ clasp = OBJ_GET_CLASS(cx, proto);
+ ok = JS_XDRRegisterClass(xdr, clasp, &classId);
+ if (!ok)
+ goto out;
+ } else {
+ clasp = JS_XDRFindClassById(xdr, classId);
+ if (!clasp) {
+ char numBuf[12];
+ JS_snprintf(numBuf, sizeof numBuf, "%ld", (long)classId);
+ JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
+ JSMSG_CANT_FIND_CLASS, numBuf);
+ ok = JS_FALSE;
+ goto out;
+ }
+ }
+ }
+
+ if (!clasp->xdrObject) {
+ JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
+ JSMSG_CANT_XDR_CLASS, clasp->name);
+ ok = JS_FALSE;
+ } else {
+ ok = clasp->xdrObject(xdr, objp);
+ }
+ out:
+ if (xdr->mode != JSXDR_ENCODE && className)
+ JS_free(cx, (void *)className);
+ return ok;
+ }
+
+ #endif /* JS_HAS_XDR */
+
+ #ifdef DEBUG_brendan
+
+ #include <stdio.h>
+ #include <math.h>
+
+ uint32 js_entry_count_max;
+ uint32 js_entry_count_sum;
+ double js_entry_count_sqsum;
+ uint32 js_entry_count_hist[11];
+
+ static void
+ MeterEntryCount(uintN count)
+ {
+ if (count) {
+ js_entry_count_sum += count;
+ js_entry_count_sqsum += (double)count * count;
+ if (count > js_entry_count_max)
+ js_entry_count_max = count;
+ }
+ js_entry_count_hist[JS_MIN(count, 10)]++;
+ }
+
+ void
+ js_DumpScopeMeters(JSRuntime *rt)
+ {
+ static FILE *logfp;
+ if (!logfp)
+ logfp = fopen("/tmp/scope.stats", "a");
+
+ {
+ double mean = 0., var = 0., sigma = 0.;
+ double nscopes = rt->liveScopes;
+ double nentrys = js_entry_count_sum;
+ if (nscopes > 0 && nentrys >= 0) {
+ mean = nentrys / nscopes;
+ var = nscopes * js_entry_count_sqsum - nentrys * nentrys;
+ if (var < 0.0 || nscopes <= 1)
+ var = 0.0;
+ else
+ var /= nscopes * (nscopes - 1);
+
+ /* Windows says sqrt(0.0) is "-1.#J" (?!) so we must test. */
+ sigma = (var != 0.) ? sqrt(var) : 0.;
+ }
+
+ fprintf(logfp,
+ "scopes %g entries %g mean %g sigma %g max %u",
+ nscopes, nentrys, mean, sigma, js_entry_count_max);
+ }
+
+ fprintf(logfp, " histogram %u %u %u %u %u %u %u %u %u %u %u\n",
+ js_entry_count_hist[0], js_entry_count_hist[1],
+ js_entry_count_hist[2], js_entry_count_hist[3],
+ js_entry_count_hist[4], js_entry_count_hist[5],
+ js_entry_count_hist[6], js_entry_count_hist[7],
+ js_entry_count_hist[8], js_entry_count_hist[9],
+ js_entry_count_hist[10]);
+ js_entry_count_sum = js_entry_count_max = 0;
+ js_entry_count_sqsum = 0;
+ memset(js_entry_count_hist, 0, sizeof js_entry_count_hist);
+ fflush(logfp);
+ }
+
+ #endif /* DEBUG_brendan */
+
+ uint32
+ js_Mark(JSContext *cx, JSObject *obj, void *arg)
+ {
+ JSScope *scope;
+ JSScopeProperty *sprop;
+ JSClass *clasp;
+
+ JS_ASSERT(OBJ_IS_NATIVE(obj));
+ scope = OBJ_SCOPE(obj);
+ #ifdef DEBUG_brendan
+ if (scope->object == obj)
+ MeterEntryCount(scope->entryCount);
+ #endif
+
+ JS_ASSERT(!SCOPE_LAST_PROP(scope) ||
+ SCOPE_HAS_PROPERTY(scope, SCOPE_LAST_PROP(scope)));
+
+ for (sprop = SCOPE_LAST_PROP(scope); sprop; sprop = sprop->parent) {
+ if (SCOPE_HAD_MIDDLE_DELETE(scope) && !SCOPE_HAS_PROPERTY(scope, sprop))
+ continue;
+ MARK_SCOPE_PROPERTY(sprop);
+ if (JSID_IS_ATOM(sprop->id))
+ GC_MARK_ATOM(cx, JSID_TO_ATOM(sprop->id), arg);
+ else if (JSID_IS_OBJECT(sprop->id))
+ GC_MARK(cx, JSID_TO_OBJECT(sprop->id), "id", arg);
+
+ #if JS_HAS_GETTER_SETTER
+ if (sprop->attrs & (JSPROP_GETTER | JSPROP_SETTER)) {
+ #ifdef GC_MARK_DEBUG
+ char buf[64];
+ JSAtom *atom = JSID_TO_ATOM(sprop->id);
+ const char *id = (atom && ATOM_IS_STRING(atom))
+ ? JS_GetStringBytes(ATOM_TO_STRING(atom))
+ : "unknown";
+ #endif
+
+ if (sprop->attrs & JSPROP_GETTER) {
+ #ifdef GC_MARK_DEBUG
+ JS_snprintf(buf, sizeof buf, "%s %s",
+ id, js_getter_str);
+ #endif
+ GC_MARK(cx,
+ JSVAL_TO_GCTHING((jsval) sprop->getter),
+ buf,
+ arg);
+ }
+ if (sprop->attrs & JSPROP_SETTER) {
+ #ifdef GC_MARK_DEBUG
+ JS_snprintf(buf, sizeof buf, "%s %s",
+ id, js_setter_str);
+ #endif
+ GC_MARK(cx,
+ JSVAL_TO_GCTHING((jsval) sprop->setter),
+ buf,
+ arg);
+ }
+ }
+ #endif /* JS_HAS_GETTER_SETTER */
+ }
+
+ /* No one runs while the GC is running, so we can use LOCKED_... here. */
+ clasp = LOCKED_OBJ_GET_CLASS(obj);
+ if (clasp->mark)
+ (void) clasp->mark(cx, obj, arg);
+
+ if (scope->object != obj) {
+ /*
+ * An unmutated object that shares a prototype's scope. We can't tell
+ * how many slots are allocated and in use at obj->slots by looking at
+ * scope, so we get obj->slots' length from its -1'st element.
+ */
+ return (uint32) obj->slots[-1];
+ }
+ return JS_MIN(scope->map.freeslot, scope->map.nslots);
+ }
+
+ void
+ js_Clear(JSContext *cx, JSObject *obj)
+ {
+ JSScope *scope;
+ JSRuntime *rt;
+ JSScopeProperty *sprop;
+ uint32 i, n;
+
+ /*
+ * Clear our scope and the property cache of all obj's properties only if
+ * obj owns the scope (i.e., not if obj is unmutated and therefore sharing
+ * its prototype's scope). NB: we do not clear any reserved slots lying
+ * below JSSLOT_FREE(clasp).
+ */
+ JS_LOCK_OBJ(cx, obj);
+ scope = OBJ_SCOPE(obj);
+ if (scope->object == obj) {
+ /* Clear the property cache before we clear the scope. */
+ rt = cx->runtime;
+ for (sprop = SCOPE_LAST_PROP(scope); sprop; sprop = sprop->parent) {
+ if (!SCOPE_HAD_MIDDLE_DELETE(scope) ||
+ SCOPE_HAS_PROPERTY(scope, sprop)) {
+ PROPERTY_CACHE_FILL(&rt->propertyCache, obj, sprop->id, NULL);
+ }
+ }
+
+ /* Now that we're done using scope->lastProp/table, clear scope. */
+ js_ClearScope(cx, scope);
+
+ /* Clear slot values and reset freeslot so we're consistent. */
+ i = scope->map.nslots;
+ n = JSSLOT_FREE(LOCKED_OBJ_GET_CLASS(obj));
+ while (--i >= n)
+ obj->slots[i] = JSVAL_VOID;
+ scope->map.freeslot = n;
+ }
+ JS_UNLOCK_OBJ(cx, obj);
+ }
+
+ jsval
+ js_GetRequiredSlot(JSContext *cx, JSObject *obj, uint32 slot)
+ {
+ jsval v;
+
+ JS_LOCK_OBJ(cx, obj);
+ v = (slot < (uint32) obj->slots[-1]) ? obj->slots[slot] : JSVAL_VOID;
+ JS_UNLOCK_OBJ(cx, obj);
+ return v;
+ }
+
+ JSBool
+ js_SetRequiredSlot(JSContext *cx, JSObject *obj, uint32 slot, jsval v)
+ {
+ JSScope *scope;
+ uint32 nslots;
+ JSClass *clasp;
+ jsval *newslots;
+
+ JS_LOCK_OBJ(cx, obj);
+ scope = OBJ_SCOPE(obj);
+ nslots = (uint32) obj->slots[-1];
+ if (slot >= nslots) {
+ /*
+ * At this point, obj may or may not own scope. If some path calls
+ * js_GetMutableScope but does not add a slot-owning property, then
+ * scope->object == obj but nslots will be nominal. If obj shares a
+ * prototype's scope, then we cannot update scope->map here, but we
+ * must update obj->slots[-1] when we grow obj->slots.
+ *
+ * See js_Mark, before the last return, where we make a special case
+ * for unmutated (scope->object != obj) objects.
+ */
+ JS_ASSERT(nslots == JS_INITIAL_NSLOTS);
+ clasp = LOCKED_OBJ_GET_CLASS(obj);
+ nslots = JSSLOT_FREE(clasp);
+ if (clasp->reserveSlots)
+ nslots += clasp->reserveSlots(cx, obj);
+ JS_ASSERT(slot < nslots);
+
+ newslots = AllocSlots(cx, obj->slots, nslots);
+ if (!newslots) {
+ JS_UNLOCK_SCOPE(cx, scope);
+ return JS_FALSE;
+ }
+ if (scope->object == obj)
+ scope->map.nslots = nslots;
+ obj->slots = newslots;
+ }
+
+ /* Whether or not we grew nslots, we may need to advance freeslot. */
+ if (scope->object == obj && slot >= scope->map.freeslot)
+ scope->map.freeslot = slot + 1;
+
+ obj->slots[slot] = v;
+ JS_UNLOCK_SCOPE(cx, scope);
+ return JS_TRUE;
+ }
+
+ #ifdef DEBUG
+
+ /* Routines to print out values during debugging. */
+
+ #ifdef OSSP
+ void printChar(jschar *cp);
+ void printString(JSString *str);
+ void printVal(JSContext *cx, jsval val);
+ void printObj(JSContext *cx, JSObject *jsobj);
+ void printId(JSContext *cx, jsid id);
+ void printAtom(JSAtom *atom);
+ #endif
+
+ void printChar(jschar *cp) {
+ fprintf(stderr, "jschar* (0x%p) \"", (void *)cp);
+ while (*cp)
+ fputc(*cp++, stderr);
+ fputc('"', stderr);
+ fputc('\n', stderr);
+ }
+
+ void printString(JSString *str) {
+ size_t i, n;
+ jschar *s;
+ fprintf(stderr, "string (0x%p) \"", (void *)str);
+ s = JSSTRING_CHARS(str);
+ for (i=0, n=JSSTRING_LENGTH(str); i < n; i++)
+ fputc(s[i], stderr);
+ fputc('"', stderr);
+ fputc('\n', stderr);
+ }
+
+ #ifndef OSSP
+ void printVal(JSContext *cx, jsval val);
+ #endif
+
+ void printObj(JSContext *cx, JSObject *jsobj) {
+ jsuint i;
+ jsval val;
+ JSClass *clasp;
+
+ fprintf(stderr, "object 0x%p\n", (void *)jsobj);
+ clasp = OBJ_GET_CLASS(cx, jsobj);
+ fprintf(stderr, "class 0x%p %s\n", (void *)clasp, clasp->name);
+ for (i=0; i < jsobj->map->nslots; i++) {
+ fprintf(stderr, "slot %3d ", i);
+ val = jsobj->slots[i];
+ if (JSVAL_IS_OBJECT(val))
+ fprintf(stderr, "object 0x%p\n", (void *)JSVAL_TO_OBJECT(val));
+ else
+ printVal(cx, val);
+ }
+ }
+
+ void printVal(JSContext *cx, jsval val) {
+ fprintf(stderr, "val %d (0x%p) = ", (int)val, (void *)val);
+ if (JSVAL_IS_NULL(val)) {
+ fprintf(stderr, "null\n");
+ } else if (JSVAL_IS_VOID(val)) {
+ fprintf(stderr, "undefined\n");
+ } else if (JSVAL_IS_OBJECT(val)) {
+ printObj(cx, JSVAL_TO_OBJECT(val));
+ } else if (JSVAL_IS_INT(val)) {
+ fprintf(stderr, "(int) %d\n", JSVAL_TO_INT(val));
+ } else if (JSVAL_IS_STRING(val)) {
+ printString(JSVAL_TO_STRING(val));
+ } else if (JSVAL_IS_DOUBLE(val)) {
+ fprintf(stderr, "(double) %g\n", *JSVAL_TO_DOUBLE(val));
+ } else {
+ JS_ASSERT(JSVAL_IS_BOOLEAN(val));
+ fprintf(stderr, "(boolean) %s\n",
+ JSVAL_TO_BOOLEAN(val) ? "true" : "false");
+ }
+ fflush(stderr);
+ }
+
+ void printId(JSContext *cx, jsid id) {
+ fprintf(stderr, "id %d (0x%p) is ", (int)id, (void *)id);
+ printVal(cx, ID_TO_VALUE(id));
+ }
+
+ void printAtom(JSAtom *atom) {
+ printString(ATOM_TO_STRING(atom));
+ }
+
+ #endif
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