/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- * vim: set ts=8 sw=4 et tw=78: * * ***** 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 #include #include "jstypes.h" #include "jsarena.h" /* Added by JSIFY */ #include "jsbit.h" #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 "jsemit.h" #include "jsfun.h" #include "jsgc.h" #include "jsinterp.h" #include "jslock.h" #include "jsnum.h" #include "jsobj.h" #include "jsopcode.h" #include "jsparse.h" #include "jsscope.h" #include "jsscript.h" #include "jsstr.h" #include "jsdbgapi.h" /* whether or not JS_HAS_OBJ_WATCHPOINT */ #if JS_HAS_GENERATORS #include "jsiter.h" #endif #if JS_HAS_XML_SUPPORT #include "jsxml.h" #endif #if JS_HAS_XDR #include "jsxdrapi.h" #endif #ifdef INCLUDE_MOZILLA_DTRACE #include "jsdtracef.h" #endif #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_TraceObject, js_Clear, js_GetRequiredSlot, js_SetRequiredSlot }; JSClass js_ObjectClass = { js_Object_str, JSCLASS_HAS_CACHED_PROTO(JSProto_Object), 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|JSPROP_SHARED, 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 == &js_CallClass || clasp == &js_BlockClass) { /* Censor activations and lexical scopes per ECMA-262. */ *vp = JSVAL_NULL; } else 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); if (pobj) { /* * Innerize pobj here to avoid sticking unwanted properties on the * outer object. This ensures that any with statements only grant * access to the inner object. */ OBJ_TO_INNER_OBJECT(cx, pobj); if (!pobj) return JS_FALSE; } 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, (JSAccessMode)(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) { JSSetSlotRequest ssr; JSRuntime *rt; /* Optimize the null case to avoid the unnecessary overhead of js_GC. */ if (!pobj) { JS_LOCK_OBJ(cx, obj); if (slot == JSSLOT_PROTO && !js_GetMutableScope(cx, obj)) { JS_UNLOCK_OBJ(cx, obj); return JS_FALSE; } LOCKED_OBJ_SET_SLOT(obj, slot, JSVAL_NULL); JS_UNLOCK_OBJ(cx, obj); return JS_TRUE; } ssr.obj = obj; ssr.pobj = pobj; ssr.slot = (uint16) slot; ssr.errnum = (uint16) JSMSG_NOT_AN_ERROR; rt = cx->runtime; JS_LOCK_GC(rt); ssr.next = rt->setSlotRequests; rt->setSlotRequests = &ssr; js_GC(cx, GC_SET_SLOT_REQUEST); JS_UNLOCK_GC(rt); if (ssr.errnum != JSMSG_NOT_AN_ERROR) { if (ssr.errnum == JSMSG_OUT_OF_MEMORY) { JS_ReportOutOfMemory(cx); } else { JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, ssr.errnum, #if JS_HAS_OBJ_PROTO_PROP object_props[slot].name #else (slot == JSSLOT_PROTO) ? js_proto_str : js_parent_str #endif ); } return JS_FALSE; } return JS_TRUE; } 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; JS_CHECK_RECURSION(cx, 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_CHECK_OPERATION_LIMIT(cx, JSOW_ENTER_SHARP)) 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; JS_KEEP_ATOMS(cx->runtime); } /* From this point the control must flow either through out: or bad:. */ 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) { JS_UNKEEP_ATOMS(cx->runtime); 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) { JS_UNKEEP_ATOMS(cx->runtime); map->sharpgen = 0; JS_HashTableDestroy(map->table); map->table = NULL; } if (idap) { ida = *idap; if (ida) { JS_DestroyIdArray(cx, ida); *idap = NULL; } } } JS_STATIC_DLL_CALLBACK(intN) gc_sharp_table_entry_marker(JSHashEntry *he, intN i, void *arg) { JS_CALL_OBJECT_TRACER((JSTracer *)arg, (JSObject *)he->key, "sharp table entry"); return JS_DHASH_NEXT; } void js_TraceSharpMap(JSTracer *trc, JSSharpObjectMap *map) { JS_ASSERT(map->depth > 0); JS_ASSERT(map->table); /* * During recursive calls to MarkSharpObjects a non-native object or * object with a custom getProperty method can potentially return an * unrooted value or even cut from the object graph an argument of one of * MarkSharpObjects recursive invocations. So we must protect map->table * entries against GC. * * We can not simply use JSTempValueRooter to mark the obj argument of * MarkSharpObjects during recursion as we have to protect *all* entries * in JSSharpObjectMap including those that contains otherwise unreachable * objects just allocated through custom getProperty. Otherwise newer * allocations can re-use the address of an object stored in the hashtable * confusing js_EnterSharpObject. So to address the problem we simply * mark all objects from map->table. * * An alternative "proper" solution is to use JSTempValueRooter in * MarkSharpObjects with code to remove during finalization entries * with otherwise unreachable objects. But this is way too complex * to justify spending efforts. */ JS_HashTableEnumerateEntries(map->table, gc_sharp_table_entry_marker, trc); } #if JS_HAS_TOSOURCE static JSBool obj_toSource(JSContext *cx, uintN argc, jsval *vp) { JSBool ok, outermost; JSObject *obj; JSHashEntry *he; JSIdArray *ida; jschar *chars, *ochars, *vsharp; const jschar *idstrchars, *vchars; size_t nchars, idstrlength, gsoplength, vlength, vsharplength, curlen; char *comma; jsint i, j, length, valcnt; jsid id; #if JS_HAS_GETTER_SETTER JSObject *obj2; JSProperty *prop; uintN attrs; #endif jsval *val; jsval localroot[4] = {JSVAL_NULL, JSVAL_NULL, JSVAL_NULL, JSVAL_NULL}; JSTempValueRooter tvr; JSString *gsopold[2]; JSString *gsop[2]; JSString *idstr, *valstr, *str; JS_CHECK_RECURSION(cx, return JS_FALSE); /* After this, control must flow through out: to exit. */ JS_PUSH_TEMP_ROOT(cx, 4, localroot, &tvr); /* If outermost, we need parentheses to be an expression, not a block. */ outermost = (cx->sharpObjectMap.depth == 0); obj = JS_THIS_OBJECT(cx, vp); if (!obj || !(he = js_EnterSharpObject(cx, obj, &ida, &chars))) { ok = JS_FALSE; goto out; } 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; } } chars[nchars++] = '{'; comma = NULL; /* * We have four local roots for cooked and raw value GC safety. Hoist the * "localroot + 2" out of the loop using the val local, which refers to * the raw (unconverted, "uncooked") values. */ val = localroot + 2; for (i = 0, length = ida->length; i < length; i++) { JSBool idIsLexicalIdentifier, needOldStyleGetterSetter; /* Get strings for id and value and GC-root them via vp. */ id = ida->vector[i]; #if JS_HAS_GETTER_SETTER ok = OBJ_LOOKUP_PROPERTY(cx, obj, id, &obj2, &prop); if (!ok) goto error; #endif /* * Convert id to a jsval and then to a string. Decide early whether we * prefer get/set or old getter/setter syntax. */ idstr = js_ValueToString(cx, ID_TO_VALUE(id)); if (!idstr) { ok = JS_FALSE; OBJ_DROP_PROPERTY(cx, obj2, prop); goto error; } *vp = STRING_TO_JSVAL(idstr); /* local root */ idIsLexicalIdentifier = js_IsIdentifier(idstr); needOldStyleGetterSetter = !idIsLexicalIdentifier || js_CheckKeyword(JSSTRING_CHARS(idstr), JSSTRING_LENGTH(idstr)) != TOK_EOF; #if JS_HAS_GETTER_SETTER 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; gsopold[valcnt] = ATOM_TO_STRING(cx->runtime->atomState.getterAtom); gsop[valcnt] = ATOM_TO_STRING(cx->runtime->atomState.getAtom); valcnt++; } if (attrs & JSPROP_SETTER) { val[valcnt] = (jsval) ((JSScopeProperty *)prop)->setter; gsopold[valcnt] = ATOM_TO_STRING(cx->runtime->atomState.setterAtom); gsop[valcnt] = ATOM_TO_STRING(cx->runtime->atomState.setAtom); valcnt++; } } else { valcnt = 1; gsop[0] = NULL; gsopold[0] = NULL; ok = OBJ_GET_PROPERTY(cx, obj, id, &val[0]); } OBJ_DROP_PROPERTY(cx, obj2, prop); } #else /* !JS_HAS_GETTER_SETTER */ /* * We simplify the source code at the price of minor dead code bloat in * the ECMA version (for testing only, see jsconfig.h). The null * default values in gsop[j] suffice to disable non-ECMA getter and * setter code. */ valcnt = 1; gsop[0] = NULL; gsopold[0] = NULL; ok = OBJ_GET_PROPERTY(cx, obj, id, &val[0]); #endif /* !JS_HAS_GETTER_SETTER */ if (!ok) goto error; /* * If id is a string that's not an identifier, then it needs to be * quoted. Also, negative integer ids must be quoted. */ if (JSID_IS_ATOM(id) ? !idIsLexicalIdentifier : (!JSID_IS_INT(id) || JSID_TO_INT(id) < 0)) { idstr = js_QuoteString(cx, idstr, (jschar)'\''); if (!idstr) { ok = JS_FALSE; goto error; } *vp = STRING_TO_JSVAL(idstr); /* local root */ } JSSTRING_CHARS_AND_LENGTH(idstr, idstrchars, idstrlength); 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; } localroot[j] = STRING_TO_JSVAL(valstr); /* local root */ JSSTRING_CHARS_AND_LENGTH(valstr, vchars, vlength); if (vchars[0] == '#') needOldStyleGetterSetter = JS_TRUE; if (needOldStyleGetterSetter) gsop[j] = gsopold[j]; /* 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); needOldStyleGetterSetter = JS_TRUE; gsop[j] = gsopold[j]; } else { if (vsharp) { vsharplength = js_strlen(vsharp); MAKE_SHARP(he); needOldStyleGetterSetter = JS_TRUE; gsop[j] = gsopold[j]; } js_LeaveSharpObject(cx, NULL); } } #endif #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] && VALUE_IS_FUNCTION(cx, val[j]) && !needOldStyleGetterSetter) { JSFunction *fun = JS_ValueToFunction(cx, val[j]); const jschar *start = vchars; const jschar *end = vchars + vlength; uint8 parenChomp = 0; if (vchars[0] == '(') { vchars++; parenChomp = 1; } /* * Try to jump "getter" or "setter" keywords, if we suspect * they might appear here. This code can be confused by people * defining Function.prototype.toString, so let's be cautious. */ if (JSFUN_GETTER_TEST(fun->flags) || JSFUN_SETTER_TEST(fun->flags)) { /* skip "getter/setter" */ const jschar *tmp = js_strchr_limit(vchars, ' ', end); if (tmp) vchars = tmp + 1; } /* Try to jump "function" keyword. */ if (vchars) vchars = js_strchr_limit(vchars, ' ', end); if (vchars) { if (*vchars == ' ') vchars++; vlength = end - vchars - parenChomp; } else { gsop[j] = NULL; vchars = start; } } #else needOldStyleGetterSetter = JS_TRUE; gsop[j] = gsopold[j]; #endif #define SAFE_ADD(n) \ JS_BEGIN_MACRO \ size_t n_ = (n); \ curlen += n_; \ if (curlen < n_) \ goto overflow; \ JS_END_MACRO curlen = nchars; if (comma) SAFE_ADD(2); SAFE_ADD(idstrlength + 1); if (gsop[j]) SAFE_ADD(JSSTRING_LENGTH(gsop[j]) + 1); SAFE_ADD(vsharplength); SAFE_ADD(vlength); /* Account for the trailing null. */ SAFE_ADD((outermost ? 2 : 1) + 1); #undef SAFE_ADD if (curlen > (size_t)-1 / sizeof(jschar)) goto overflow; /* Allocate 1 + 1 at end for closing brace and terminating 0. */ chars = (jschar *) realloc((ochars = chars), curlen * 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 = ", "; if (needOldStyleGetterSetter) { 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 { /* New style "decompilation" */ 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; /* Extraneous space after id here will be extracted later */ chars[nchars++] = gsop[j] ? ' ' : ':'; } if (vsharplength) { js_strncpy(&chars[nchars], vsharp, vsharplength); nchars += vsharplength; } js_strncpy(&chars[nchars], vchars, vlength); nchars += vlength; if (vsharp) JS_free(cx, vsharp); } } chars[nchars++] = '}'; if (outermost) chars[nchars++] = ')'; chars[nchars] = 0; error: js_LeaveSharpObject(cx, &ida); if (!ok) { if (chars) free(chars); goto out; } if (!chars) { JS_ReportOutOfMemory(cx); ok = JS_FALSE; goto out; } make_string: str = js_NewString(cx, chars, nchars); if (!str) { free(chars); ok = JS_FALSE; goto out; } *vp = STRING_TO_JSVAL(str); ok = JS_TRUE; out: JS_POP_TEMP_ROOT(cx, &tvr); return ok; overflow: JS_free(cx, vsharp); free(chars); chars = NULL; goto error; } #endif /* JS_HAS_TOSOURCE */ static JSBool obj_toString(JSContext *cx, uintN argc, jsval *vp) { JSObject *obj; jschar *chars; size_t nchars; const char *clazz, *prefix; JSString *str; obj = JS_THIS_OBJECT(cx, vp); if (!obj) return JS_FALSE; obj = js_GetWrappedObject(cx, obj); 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); if (!str) { JS_free(cx, chars); return JS_FALSE; } *vp = STRING_TO_JSVAL(str); return JS_TRUE; } static JSBool obj_toLocaleString(JSContext *cx, uintN argc, jsval *vp) { jsval thisv; JSString *str; thisv = JS_THIS(cx, vp); if (JSVAL_IS_NULL(thisv)) return JS_FALSE; str = js_ValueToString(cx, thisv); if (!str) return JS_FALSE; *vp = STRING_TO_JSVAL(str); return JS_TRUE; } static JSBool obj_valueOf(JSContext *cx, uintN argc, jsval *vp) { *vp = JS_THIS(cx, vp); return !JSVAL_IS_NULL(*vp); } /* * 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, JSAtom *caller) { JSRuntime *rt; JSPrincipals *scopePrincipals; const char *callerstr; rt = cx->runtime; if (rt->findObjectPrincipals) { scopePrincipals = rt->findObjectPrincipals(cx, scopeobj); if (!principals || !scopePrincipals || !principals->subsume(principals, scopePrincipals)) { callerstr = js_AtomToPrintableString(cx, caller); if (!callerstr) return JS_FALSE; JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_BAD_INDIRECT_CALL, callerstr); 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; } const char * js_ComputeFilename(JSContext *cx, JSStackFrame *caller, JSPrincipals *principals, uintN *linenop) { uint32 flags; flags = JS_GetScriptFilenameFlags(caller->script); if ((flags & JSFILENAME_PROTECTED) && strcmp(principals->codebase, "[System Principal]")) { *linenop = 0; return principals->codebase; } if (caller->regs && *caller->regs->pc == JSOP_EVAL) { JS_ASSERT(caller->regs->pc[JSOP_EVAL_LENGTH] == JSOP_LINENO); *linenop = GET_UINT16(caller->regs->pc + JSOP_EVAL_LENGTH); } else { *linenop = js_PCToLineNumber(cx, caller->script, caller->regs ? caller->regs->pc : NULL); } return caller->script->filename; } 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; JSObject *setCallerScopeChain = NULL; JSBool setCallerVarObj = JS_FALSE; #endif fp = cx->fp; caller = JS_GetScriptedCaller(cx, fp); indirectCall = (caller && caller->regs && *caller->regs->pc != JSOP_EVAL); /* * Ban all indirect uses of eval (global.foo = eval; global.foo(...)) and * calls that attempt to use a non-global object as the "with" object in * the former indirect case. */ scopeobj = OBJ_GET_PARENT(cx, obj); if (scopeobj) { scopeobj = js_GetWrappedObject(cx, obj); scopeobj = OBJ_GET_PARENT(cx, scopeobj); } if (indirectCall || scopeobj) { uintN flags = scopeobj ? JSREPORT_ERROR : JSREPORT_STRICT | JSREPORT_WARNING; if (!JS_ReportErrorFlagsAndNumber(cx, flags, 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 the caller is a lightweight function and doesn't have a variables * object, then we need to provide one for the compiler to stick any * declared (var) variables into. */ if (caller && !caller->varobj && !js_GetCallObject(cx, caller, NULL)) return JS_FALSE; /* * Script.prototype.compile/exec and Object.prototype.eval all take an * optional trailing argument that overrides the scope object. */ if (argc >= 2) { if (!js_ValueToObject(cx, argv[1], &scopeobj)) return JS_FALSE; argv[1] = OBJECT_TO_JSVAL(scopeobj); } /* From here on, control must exit through label out with ok set. */ js_DisablePropertyCache(cx); if (!scopeobj) { #if JS_HAS_EVAL_THIS_SCOPE /* If obj.eval(str), emulate 'with (obj) eval(str)' in the caller. */ if (indirectCall) { callerScopeChain = js_GetScopeChain(cx, caller); if (!callerScopeChain) { ok = JS_FALSE; goto out; } OBJ_TO_INNER_OBJECT(cx, obj); if (!obj) { ok = JS_FALSE; goto out; } if (obj != callerScopeChain) { ok = js_CheckPrincipalsAccess(cx, obj, caller->script->principals, cx->runtime->atomState.evalAtom); if (!ok) goto out; scopeobj = js_NewWithObject(cx, obj, callerScopeChain, -1); if (!scopeobj) { ok = JS_FALSE; goto out; } /* Set fp->scopeChain too, for the compiler. */ caller->scopeChain = fp->scopeChain = scopeobj; /* Remember scopeobj so we can null its private when done. */ setCallerScopeChain = scopeobj; } callerVarObj = caller->varobj; if (obj != callerVarObj) { /* Set fp->varobj too, for the compiler. */ caller->varobj = fp->varobj = obj; setCallerVarObj = JS_TRUE; } } #endif /* * Compile using caller's current scope object. * * NB: This means that native callers (who reach this point through * the C API) must use the two parameter form. */ if (caller) { scopeobj = js_GetScopeChain(cx, caller); if (!scopeobj) { ok = JS_FALSE; goto out; } } } /* Ensure we compile this eval with the right object in the scope chain. */ scopeobj = js_CheckScopeChainValidity(cx, scopeobj, js_eval_str); if (!scopeobj) { ok = JS_FALSE; goto out; } str = JSVAL_TO_STRING(argv[0]); if (caller) { principals = JS_EvalFramePrincipals(cx, fp, caller); file = js_ComputeFilename(cx, caller, principals, &line); } 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_CompileScript(cx, scopeobj, principals, TCF_COMPILE_N_GO, JSSTRING_CHARS(str), JSSTRING_LENGTH(str), NULL, file, line); if (!script) { ok = JS_FALSE; goto out; } if (argc < 2) { /* Execute using caller's new scope object (might be a Call object). */ if (caller) scopeobj = caller->scopeChain; } /* * 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, cx->runtime->atomState.evalAtom); if (ok) 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; JS_ASSERT(OBJ_GET_CLASS(cx, setCallerScopeChain) == &js_WithClass); JS_SetPrivate(cx, setCallerScopeChain, NULL); } if (setCallerVarObj) caller->varobj = callerVarObj; #endif js_EnablePropertyCache(cx); return ok; } #if JS_HAS_OBJ_WATCHPOINT static JSBool obj_watch_handler(JSContext *cx, JSObject *obj, jsval id, jsval old, jsval *nvp, void *closure) { JSObject *callable; JSRuntime *rt; JSStackFrame *caller; JSPrincipals *subject, *watcher; JSResolvingKey key; JSResolvingEntry *entry; uint32 generation; jsval argv[3]; JSBool ok; callable = (JSObject *) closure; rt = cx->runtime; if (rt->findObjectPrincipals) { /* Skip over any obj_watch_* frames between us and the real subject. */ caller = JS_GetScriptedCaller(cx, cx->fp); if (caller) { /* * Only call the watch handler if the watcher is allowed to watch * the currently executing script. */ watcher = rt->findObjectPrincipals(cx, callable); subject = JS_StackFramePrincipals(cx, caller); if (watcher && subject && !watcher->subsume(watcher, subject)) { /* Silently don't call the watch handler. */ return JS_TRUE; } } } /* 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; argv[0] = id; argv[1] = old; argv[2] = *nvp; ok = js_InternalCall(cx, obj, OBJECT_TO_JSVAL(callable), 3, argv, nvp); js_StopResolving(cx, &key, JSRESFLAG_WATCH, entry, generation); return ok; } static JSBool obj_watch(JSContext *cx, uintN argc, jsval *vp) { JSObject *callable; jsval userid, value; jsid propid; JSObject *obj; uintN attrs; callable = js_ValueToCallableObject(cx, &vp[3], 0); if (!callable) return JS_FALSE; /* Compute the unique int/atom symbol id needed by js_LookupProperty. */ userid = vp[2]; if (!JS_ValueToId(cx, userid, &propid)) return JS_FALSE; obj = JS_THIS_OBJECT(cx, vp); if (!obj || !OBJ_CHECK_ACCESS(cx, obj, propid, JSACC_WATCH, &value, &attrs)) return JS_FALSE; if (attrs & JSPROP_READONLY) return JS_TRUE; *vp = JSVAL_VOID; return JS_SetWatchPoint(cx, obj, userid, obj_watch_handler, callable); } static JSBool obj_unwatch(JSContext *cx, uintN argc, jsval *vp) { JSObject *obj; obj = JS_THIS_OBJECT(cx, vp); if (!obj) return JS_FALSE; *vp = JSVAL_VOID; return JS_ClearWatchPoint(cx, obj, vp[2], NULL, NULL); } #endif /* JS_HAS_OBJ_WATCHPOINT */ /* * Prototype and property query methods, to complement the 'in' and * 'instanceof' operators. */ /* Proposed ECMA 15.2.4.5. */ static JSBool obj_hasOwnProperty(JSContext *cx, uintN argc, jsval *vp) { JSObject *obj; obj = JS_THIS_OBJECT(cx, vp); return obj && js_HasOwnPropertyHelper(cx, obj->map->ops->lookupProperty, vp); } JSBool js_HasOwnPropertyHelper(JSContext *cx, JSLookupPropOp lookup, jsval *vp) { jsid id; JSObject *obj, *obj2; JSProperty *prop; JSScopeProperty *sprop; if (!JS_ValueToId(cx, vp[2], &id)) return JS_FALSE; obj = JS_THIS_OBJECT(cx, vp); if (!obj || !lookup(cx, obj, id, &obj2, &prop)) return JS_FALSE; if (!prop) { *vp = JSVAL_FALSE; } else if (obj2 == obj) { *vp = JSVAL_TRUE; } else { JSClass *clasp; JSExtendedClass *xclasp; JSObject *outer; clasp = OBJ_GET_CLASS(cx, obj2); if (!(clasp->flags & JSCLASS_IS_EXTENDED) || !(xclasp = (JSExtendedClass *) clasp)->outerObject) { outer = NULL; } else { outer = xclasp->outerObject(cx, obj2); if (!outer) return JS_FALSE; } if (outer == obj) { *vp = JSVAL_TRUE; } else if (OBJ_IS_NATIVE(obj2) && OBJ_GET_CLASS(cx, obj) == clasp) { /* * The combination of JSPROP_SHARED and JSPROP_PERMANENT in a * delegated property makes that property appear to be direct in * all delegating instances of the same native class. This hack * avoids bloating every function instance with its own 'length' * (AKA 'arity') property. But it must not extend across class * boundaries, to avoid making hasOwnProperty lie (bug 320854). * * It's not really a hack, of course: a permanent property can't * be deleted, and JSPROP_SHARED means "don't allocate a slot in * any instance, prototype or delegating". Without a slot, and * without the ability to remove and recreate (with differences) * the property, there is no way to tell whether it is directly * owned, or indirectly delegated. */ sprop = (JSScopeProperty *)prop; *vp = BOOLEAN_TO_JSVAL(SPROP_IS_SHARED_PERMANENT(sprop)); } else { *vp = 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, uintN argc, jsval *vp) { JSBool b; if (!js_IsDelegate(cx, JS_THIS_OBJECT(cx, vp), vp[2], &b)) return JS_FALSE; *vp = BOOLEAN_TO_JSVAL(b); return JS_TRUE; } /* Proposed ECMA 15.2.4.7. */ static JSBool obj_propertyIsEnumerable(JSContext *cx, uintN argc, jsval *vp) { jsid id; JSObject *obj, *pobj; uintN attrs; JSProperty *prop; JSBool ok; if (!JS_ValueToId(cx, vp[2], &id)) return JS_FALSE; obj = JS_THIS_OBJECT(cx, vp); if (!obj || !OBJ_LOOKUP_PROPERTY(cx, obj, id, &pobj, &prop)) return JS_FALSE; if (!prop) { *vp = 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 (pobj != obj && !(OBJ_IS_NATIVE(pobj) && SPROP_IS_SHARED_PERMANENT((JSScopeProperty *)prop))) { OBJ_DROP_PROPERTY(cx, pobj, prop); *vp = JSVAL_FALSE; return JS_TRUE; } ok = OBJ_GET_ATTRIBUTES(cx, pobj, id, prop, &attrs); OBJ_DROP_PROPERTY(cx, pobj, prop); if (ok) *vp = BOOLEAN_TO_JSVAL((attrs & JSPROP_ENUMERATE) != 0); return ok; } #if JS_HAS_GETTER_SETTER static JSBool obj_defineGetter(JSContext *cx, uintN argc, jsval *vp) { jsval fval, junk; jsid id; JSObject *obj; uintN attrs; fval = vp[3]; 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, vp[2], &id)) return JS_FALSE; obj = JS_THIS_OBJECT(cx, vp); if (!obj || !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; *vp = JSVAL_VOID; return OBJ_DEFINE_PROPERTY(cx, obj, id, JSVAL_VOID, (JSPropertyOp) JSVAL_TO_OBJECT(fval), JS_PropertyStub, JSPROP_ENUMERATE | JSPROP_GETTER | JSPROP_SHARED, NULL); } static JSBool obj_defineSetter(JSContext *cx, uintN argc, jsval *vp) { jsval fval, junk; jsid id; JSObject *obj; uintN attrs; fval = vp[3]; 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, vp[2], &id)) return JS_FALSE; obj = JS_THIS_OBJECT(cx, vp); if (!obj || !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; *vp = JSVAL_VOID; return OBJ_DEFINE_PROPERTY(cx, obj, id, JSVAL_VOID, JS_PropertyStub, (JSPropertyOp) JSVAL_TO_OBJECT(fval), JSPROP_ENUMERATE | JSPROP_SETTER | JSPROP_SHARED, NULL); } static JSBool obj_lookupGetter(JSContext *cx, uintN argc, jsval *vp) { jsid id; JSObject *obj, *pobj; JSProperty *prop; JSScopeProperty *sprop; if (!JS_ValueToId(cx, vp[2], &id)) return JS_FALSE; obj = JS_THIS_OBJECT(cx, vp); if (!obj || !OBJ_LOOKUP_PROPERTY(cx, obj, id, &pobj, &prop)) return JS_FALSE; *vp = JSVAL_VOID; if (prop) { if (OBJ_IS_NATIVE(pobj)) { sprop = (JSScopeProperty *) prop; if (sprop->attrs & JSPROP_GETTER) *vp = OBJECT_TO_JSVAL(sprop->getter); } OBJ_DROP_PROPERTY(cx, pobj, prop); } return JS_TRUE; } static JSBool obj_lookupSetter(JSContext *cx, uintN argc, jsval *vp) { jsid id; JSObject *obj, *pobj; JSProperty *prop; JSScopeProperty *sprop; if (!JS_ValueToId(cx, vp[2], &id)) return JS_FALSE; obj = JS_THIS_OBJECT(cx, vp); if (!obj || !OBJ_LOOKUP_PROPERTY(cx, obj, id, &pobj, &prop)) return JS_FALSE; *vp = JSVAL_VOID; if (prop) { if (OBJ_IS_NATIVE(pobj)) { sprop = (JSScopeProperty *) prop; if (sprop->attrs & JSPROP_SETTER) *vp = 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 const char js_hasOwnProperty_str[] = "hasOwnProperty"; const char js_isPrototypeOf_str[] = "isPrototypeOf"; const char js_propertyIsEnumerable_str[] = "propertyIsEnumerable"; #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_FN(js_toSource_str, obj_toSource, 0,0,0), #endif JS_FN(js_toString_str, obj_toString, 0,0,0), JS_FN(js_toLocaleString_str, obj_toLocaleString, 0,0,0), JS_FN(js_valueOf_str, obj_valueOf, 0,0,0), #if JS_HAS_OBJ_WATCHPOINT JS_FN(js_watch_str, obj_watch, 2,2,0), JS_FN(js_unwatch_str, obj_unwatch, 1,1,0), #endif JS_FN(js_hasOwnProperty_str, obj_hasOwnProperty, 1,1,0), JS_FN(js_isPrototypeOf_str, obj_isPrototypeOf, 1,1,0), JS_FN(js_propertyIsEnumerable_str, obj_propertyIsEnumerable, 1,1,0), #if JS_HAS_GETTER_SETTER JS_FN(js_defineGetter_str, obj_defineGetter, 2,2,0), JS_FN(js_defineSetter_str, obj_defineSetter, 2,2,0), JS_FN(js_lookupGetter_str, obj_lookupGetter, 1,1,0), JS_FN(js_lookupSetter_str, obj_lookupSetter, 1,1,0), #endif JS_FS_END }; 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, 0); 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_TraceObject, js_Clear, NULL, NULL }; static JSObjectOps * with_getObjectOps(JSContext *cx, JSClass *clasp) { return &js_WithObjectOps; } JSClass js_WithClass = { "With", JSCLASS_HAS_PRIVATE | JSCLASS_HAS_RESERVED_SLOTS(1) | JSCLASS_IS_ANONYMOUS, 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 }; JSObject * js_NewWithObject(JSContext *cx, JSObject *proto, JSObject *parent, jsint depth) { JSObject *obj; obj = js_NewObject(cx, &js_WithClass, proto, parent, 0); if (!obj) return NULL; STOBJ_SET_SLOT(obj, JSSLOT_PRIVATE, PRIVATE_TO_JSVAL(cx->fp)); OBJ_SET_BLOCK_DEPTH(cx, obj, depth); return obj; } JSObject * js_NewBlockObject(JSContext *cx) { JSObject *obj; JSBool ok; /* * Null obj's proto slot so that Object.prototype.* does not pollute block * scopes. Make sure obj has its own scope too, since clearing proto does * not affect OBJ_SCOPE(obj). */ obj = js_NewObject(cx, &js_BlockClass, NULL, NULL, 0); if (!obj) return NULL; JS_LOCK_OBJ(cx, obj); ok = js_GetMutableScope(cx, obj) != NULL; JS_UNLOCK_OBJ(cx, obj); if (!ok) return NULL; OBJ_SET_PROTO(cx, obj, NULL); return obj; } JSObject * js_CloneBlockObject(JSContext *cx, JSObject *proto, JSObject *parent, JSStackFrame *fp) { JSObject *clone; JS_ASSERT(STOBJ_GET_CLASS(proto) == &js_BlockClass); JS_ASSERT(!OBJ_IS_CLONED_BLOCK(proto)); clone = js_NewObject(cx, &js_BlockClass, proto, parent, 0); if (!clone) return NULL; STOBJ_SET_SLOT(clone, JSSLOT_PRIVATE, PRIVATE_TO_JSVAL(fp)); STOBJ_SET_SLOT(clone, JSSLOT_BLOCK_DEPTH, OBJ_GET_SLOT(cx, proto, JSSLOT_BLOCK_DEPTH)); JS_ASSERT(OBJ_IS_CLONED_BLOCK(clone)); return clone; } static JSBool js_ReallocSlots(JSContext *cx, JSObject *obj, uint32 nslots, JSBool exactAllocation); JSBool js_PutBlockObject(JSContext *cx, JSBool normalUnwind) { JSStackFrame *fp; JSObject *obj; uintN depth, count; /* Blocks have one fixed slot available for the first local.*/ JS_STATIC_ASSERT(JS_INITIAL_NSLOTS == JSSLOT_BLOCK_DEPTH + 2); fp = cx->fp; obj = fp->scopeChain; JS_ASSERT(OBJ_GET_CLASS(cx, obj) == &js_BlockClass); JS_ASSERT(OBJ_GET_PRIVATE(cx, obj) == cx->fp); JS_ASSERT(OBJ_IS_CLONED_BLOCK(obj)); /* * Block objects should never be exposed to scripts. Thus the clone should * not own the property map and rather always share it with the prototype * object. This allows to skip updating OBJ_SCOPE(obj)->map.freeslot after * we copy the stack slots into reserved slots. */ JS_ASSERT(OBJ_SCOPE(obj)->object != obj); /* Block objects should not have reserved slots before they are put. */ JS_ASSERT(STOBJ_NSLOTS(obj) == JS_INITIAL_NSLOTS); /* The block and its locals must be on the current stack for GC safety. */ depth = OBJ_BLOCK_DEPTH(cx, obj); count = OBJ_BLOCK_COUNT(cx, obj); JS_ASSERT(depth <= (size_t) (fp->regs->sp - fp->spbase)); JS_ASSERT(count <= (size_t) (fp->regs->sp - fp->spbase - depth)); /* See comments in CheckDestructuring from jsparse.c. */ JS_ASSERT(count >= 1); obj->fslots[JSSLOT_BLOCK_DEPTH + 1] = fp->spbase[depth]; if (normalUnwind && count > 1) { --count; JS_LOCK_OBJ(cx, obj); if (!js_ReallocSlots(cx, obj, JS_INITIAL_NSLOTS + count, JS_TRUE)) normalUnwind = JS_FALSE; else memcpy(obj->dslots, fp->spbase + depth + 1, count * sizeof(jsval)); JS_UNLOCK_OBJ(cx, obj); } /* We must clear the private slot even with errors. */ JS_SetPrivate(cx, obj, NULL); fp->scopeChain = OBJ_GET_PARENT(cx, obj); return normalUnwind; } static JSBool block_getProperty(JSContext *cx, JSObject *obj, jsval id, jsval *vp) { uintN index; JSStackFrame *fp; JS_ASSERT(JS_InstanceOf(cx, obj, &js_BlockClass, NULL)); JS_ASSERT(OBJ_IS_CLONED_BLOCK(obj)); if (!JSVAL_IS_INT(id)) return JS_TRUE; index = (uint16) JSVAL_TO_INT(id); fp = (JSStackFrame *) JS_GetPrivate(cx, obj); if (fp) { index += OBJ_BLOCK_DEPTH(cx, obj); JS_ASSERT(index < fp->script->depth); *vp = fp->spbase[index]; return JS_TRUE; } /* Reserve slots start with the first slot after the private. */ index += JSSLOT_BLOCK_DEPTH - JSSLOT_PRIVATE; return JS_GetReservedSlot(cx, obj, index, vp); } static JSBool block_setProperty(JSContext *cx, JSObject *obj, jsval id, jsval *vp) { uintN index; JSStackFrame *fp; JS_ASSERT(JS_InstanceOf(cx, obj, &js_BlockClass, NULL)); if (!JSVAL_IS_INT(id)) return JS_TRUE; index = (uint16) JSVAL_TO_INT(id); fp = (JSStackFrame *) JS_GetPrivate(cx, obj); if (fp) { index += OBJ_BLOCK_DEPTH(cx, obj); JS_ASSERT(index < fp->script->depth); fp->spbase[index] = *vp; return JS_TRUE; } /* Reserve slots start with the first slot after the private. */ index += JSSLOT_BLOCK_DEPTH - JSSLOT_PRIVATE; return JS_SetReservedSlot(cx, obj, index, *vp); } #if JS_HAS_XDR #define NO_PARENT_INDEX ((uint32)-1) uint32 FindObjectIndex(JSObjectArray *array, JSObject *obj) { size_t i; if (array) { i = array->length; do { if (array->vector[--i] == obj) return i; } while (i != 0); } return NO_PARENT_INDEX; } static JSBool block_xdrObject(JSXDRState *xdr, JSObject **objp) { JSContext *cx; uint32 parentId; JSObject *obj, *parent; uint16 depth, count, i; uint32 tmp; JSTempValueRooter tvr; JSScopeProperty *sprop; jsid propid; JSAtom *atom; int16 shortid; JSBool ok; cx = xdr->cx; #ifdef __GNUC__ obj = NULL; /* quell GCC overwarning */ #endif if (xdr->mode == JSXDR_ENCODE) { obj = *objp; parent = OBJ_GET_PARENT(cx, obj); parentId = (xdr->script->objectsOffset == 0) ? NO_PARENT_INDEX : FindObjectIndex(JS_SCRIPT_OBJECTS(xdr->script), parent); depth = (uint16)OBJ_BLOCK_DEPTH(cx, obj); count = (uint16)OBJ_BLOCK_COUNT(cx, obj); tmp = (uint32)(depth << 16) | count; } #ifdef __GNUC__ /* suppress bogus gcc warnings */ else count = 0; #endif /* First, XDR the parent atomid. */ if (!JS_XDRUint32(xdr, &parentId)) return JS_FALSE; if (xdr->mode == JSXDR_DECODE) { obj = js_NewBlockObject(cx); if (!obj) return JS_FALSE; *objp = obj; /* * If there's a parent id, then get the parent out of our script's * object array. We know that we XDR block object in outer-to-inner * order, which means that getting the parent now will work. */ if (parentId == NO_PARENT_INDEX) parent = NULL; else JS_GET_SCRIPT_OBJECT(xdr->script, parentId, parent); STOBJ_SET_PARENT(obj, parent); } JS_PUSH_SINGLE_TEMP_ROOT(cx, OBJECT_TO_JSVAL(obj), &tvr); if (!JS_XDRUint32(xdr, &tmp)) { JS_POP_TEMP_ROOT(cx, &tvr); return JS_FALSE; } if (xdr->mode == JSXDR_DECODE) { depth = (uint16)(tmp >> 16); count = (uint16)tmp; STOBJ_SET_SLOT(obj, JSSLOT_BLOCK_DEPTH, INT_TO_JSVAL(depth)); } /* * XDR the block object's properties. We know that there are 'count' * properties to XDR, stored as id/shortid pairs. We do not XDR any * non-native properties, only those that the compiler created. */ sprop = NULL; ok = JS_TRUE; for (i = 0; i < count; i++) { if (xdr->mode == JSXDR_ENCODE) { /* Find a property to XDR. */ do { /* If sprop is NULL, this is the first property. */ sprop = sprop ? sprop->parent : OBJ_SCOPE(obj)->lastProp; } while (!(sprop->flags & SPROP_HAS_SHORTID)); JS_ASSERT(sprop->getter == js_BlockClass.getProperty); propid = sprop->id; JS_ASSERT(JSID_IS_ATOM(propid)); atom = JSID_TO_ATOM(propid); shortid = sprop->shortid; JS_ASSERT(shortid >= 0); } /* XDR the real id, then the shortid. */ if (!js_XDRStringAtom(xdr, &atom) || !JS_XDRUint16(xdr, (uint16 *)&shortid)) { ok = JS_FALSE; break; } if (xdr->mode == JSXDR_DECODE) { if (!js_DefineNativeProperty(cx, obj, ATOM_TO_JSID(atom), JSVAL_VOID, NULL, NULL, JSPROP_ENUMERATE | JSPROP_PERMANENT, SPROP_HAS_SHORTID, shortid, NULL)) { ok = JS_FALSE; break; } } } JS_POP_TEMP_ROOT(cx, &tvr); return ok; } #else # define block_xdrObject NULL #endif static uint32 block_reserveSlots(JSContext *cx, JSObject *obj) { return OBJ_IS_CLONED_BLOCK(obj) ? OBJ_BLOCK_COUNT(cx, obj) : 0; } JSClass js_BlockClass = { "Block", JSCLASS_HAS_PRIVATE | JSCLASS_HAS_RESERVED_SLOTS(1) | JSCLASS_IS_ANONYMOUS | JSCLASS_HAS_CACHED_PROTO(JSProto_Block), JS_PropertyStub, JS_PropertyStub, block_getProperty, block_setProperty, JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, JS_FinalizeStub, NULL, NULL, NULL, NULL, block_xdrObject, NULL, NULL, block_reserveSlots }; JSObject* js_InitBlockClass(JSContext *cx, JSObject* obj) { JSObject *proto; proto = JS_InitClass(cx, obj, NULL, &js_BlockClass, NULL, 0, NULL, NULL, NULL, NULL); if (!proto) return NULL; OBJ_SET_PROTO(cx, proto, NULL); return proto; } JSObject * js_InitEval(JSContext *cx, JSObject *obj) { /* ECMA (15.1.2.1) says 'eval' is a property of the global object. */ if (!js_DefineFunction(cx, obj, cx->runtime->atomState.evalAtom, obj_eval, 1, 0)) { return NULL; } return obj; } JSObject * js_InitObjectClass(JSContext *cx, JSObject *obj) { return JS_InitClass(cx, obj, NULL, &js_ObjectClass, Object, 1, object_props, object_methods, NULL, NULL); } void js_InitObjectMap(JSObjectMap *map, jsrefcount nrefs, JSObjectOps *ops, JSClass *clasp) { map->nrefs = nrefs; map->ops = ops; 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 void FreeSlots(JSContext *cx, JSObject *obj) { if (obj->dslots) { JS_ASSERT((uint32)obj->dslots[-1] > JS_INITIAL_NSLOTS); JS_free(cx, obj->dslots - 1); obj->dslots = NULL; } } #define SLOTS_TO_DYNAMIC_WORDS(nslots) \ (JS_ASSERT((nslots) > JS_INITIAL_NSLOTS), (nslots) + 1 - JS_INITIAL_NSLOTS) #define DYNAMIC_WORDS_TO_SLOTS(words) \ (JS_ASSERT((words) > 1), (words) - 1 + JS_INITIAL_NSLOTS) static JSBool js_ReallocSlots(JSContext *cx, JSObject *obj, uint32 nslots, JSBool exactAllocation) { jsval *old, *slots; uint32 oslots, nwords, owords, log, i; /* * Minimal number of dynamic slots to allocate. */ #define MIN_DYNAMIC_WORDS 4 /* * The limit to switch to linear allocation strategy from the power of 2 * growth no to waste too much memory. */ #define LINEAR_GROWTH_STEP JS_BIT(16) old = obj->dslots; if (nslots <= JS_INITIAL_NSLOTS) { if (old && (exactAllocation || SLOTS_TO_DYNAMIC_WORDS((uint32)old[-1]) != MIN_DYNAMIC_WORDS || nslots <= (JS_INITIAL_NSLOTS + JSSLOT_FREE(STOBJ_GET_CLASS(obj))) / 2)) { /* * We do not want to free dynamic slots when allocation is a hint, * we reached minimal allocation and almost all fixed slots are * used. It avoids allocating dynamic slots again when properties * are added to the object. * * If there were no private or reserved slots, the condition to * free the slots would be * * nslots <= JS_INITIAL_NSLOTS / 2 * * but to account for never removed slots before JSSLOT_FREE(class) * we need to subtract it from the slot counts which gives * * nslots - JSSLOT_FREE <= (JS_INITIAL_NSLOTS - JSSLOT_FREE) / 2 * * or * * nslots <= (JS_INITIAL_NSLOTS + JSSLOT_FREE) / 2 */ FreeSlots(cx, obj); } return JS_TRUE; } oslots = (old) ? (uint32)*--old : JS_INITIAL_NSLOTS; nwords = SLOTS_TO_DYNAMIC_WORDS(nslots); if (nslots > oslots) { if (!exactAllocation) { /* * Round up nslots so the number of bytes in dslots array is power * of 2 to ensure exponential grouth. */ if (nwords <= MIN_DYNAMIC_WORDS) { nwords = MIN_DYNAMIC_WORDS; } else if (nwords < LINEAR_GROWTH_STEP) { JS_CEILING_LOG2(log, nwords); nwords = JS_BIT(log); } else { nwords = JS_ROUNDUP(nwords, LINEAR_GROWTH_STEP); } } slots = (jsval *)JS_realloc(cx, old, nwords * sizeof(jsval)); if (!slots) return JS_FALSE; } else { JS_ASSERT(nslots < oslots); if (!exactAllocation) { owords = DYNAMIC_WORDS_TO_SLOTS(oslots); if (owords <= MIN_DYNAMIC_WORDS) return JS_TRUE; if (owords < LINEAR_GROWTH_STEP * 2) { /* * Shrink only if 1/4 of slots are left and we need to grow * the array at least twice to reach the current capacity. It * prevents frequent capacity growth/shrinking when slots are * often removed and added. */ if (nwords > owords / 4) return JS_TRUE; JS_CEILING_LOG2(log, nwords); nwords = JS_BIT(log); if (nwords < MIN_DYNAMIC_WORDS) nwords = MIN_DYNAMIC_WORDS; } else { /* * Shrink only if we free at least 2 linear allocation * segments, to prevent growth/shrinking resonance. */ if (nwords > owords - LINEAR_GROWTH_STEP * 2) return JS_TRUE; nwords = JS_ROUNDUP(nwords, LINEAR_GROWTH_STEP); } } /* We avoid JS_realloc not to report a failed shrink attempt. */ slots = (jsval *)realloc(old, nwords * sizeof(jsval)); if (!slots) slots = old; } nslots = DYNAMIC_WORDS_TO_SLOTS(nwords); *slots++ = (jsval)nslots; obj->dslots = slots; /* If we're extending an allocation, initialize free slots. */ for (i = oslots; i < nslots; i++) slots[i - JS_INITIAL_NSLOTS] = JSVAL_VOID; return JS_TRUE; #undef LINEAR_GROWTH_STEP #undef MIN_DYNAMIC_WORDS } extern JSBool js_GetClassId(JSContext *cx, JSClass *clasp, jsid *idp) { JSProtoKey key; JSAtom *atom; key = JSCLASS_CACHED_PROTO_KEY(clasp); if (key != JSProto_Null) { *idp = INT_TO_JSID(key); } else if (clasp->flags & JSCLASS_IS_ANONYMOUS) { *idp = INT_TO_JSID(JSProto_Object); } else { atom = js_Atomize(cx, clasp->name, strlen(clasp->name), 0); if (!atom) return JS_FALSE; *idp = ATOM_TO_JSID(atom); } return JS_TRUE; } JSObject * js_NewObject(JSContext *cx, JSClass *clasp, JSObject *proto, JSObject *parent, uintN objectSize) { jsid id; /* Bootstrap the ur-object, and make it the default prototype object. */ if (!proto) { if (!js_GetClassId(cx, clasp, &id)) return NULL; if (!js_GetClassPrototype(cx, parent, id, &proto)) return NULL; if (!proto && !js_GetClassPrototype(cx, parent, INT_TO_JSID(JSProto_Object), &proto)) { return NULL; } } return js_NewObjectWithGivenProto(cx, clasp, proto, parent, objectSize); } JSObject * js_NewObjectWithGivenProto(JSContext *cx, JSClass *clasp, JSObject *proto, JSObject *parent, uintN objectSize) { JSObject *obj; JSObjectOps *ops; JSObjectMap *map; JSClass *protoclasp; uint32 nslots, i; JSTempValueRooter tvr; #ifdef INCLUDE_MOZILLA_DTRACE if (JAVASCRIPT_OBJECT_CREATE_START_ENABLED()) jsdtrace_object_create_start(cx->fp, clasp); #endif /* Currently only functions can have non-standard allocation size. */ if (clasp == &js_FunctionClass) { if (objectSize == 0) objectSize = sizeof(JSFunction); else JS_ASSERT(objectSize == sizeof(JSObject)); } else { JS_ASSERT(objectSize == 0); objectSize = sizeof(JSObject); } /* * Allocate an object from the GC heap and initialize all its fields before * doing any operation that can potentially trigger GC. */ obj = (JSObject *) js_NewGCThing(cx, GCX_OBJECT, objectSize); if (!obj) goto earlybad; obj->map = NULL; obj->dslots = NULL; /* Set the proto and parent properties. */ STOBJ_SET_PROTO(obj, proto); STOBJ_SET_PARENT(obj, parent); /* * Set the class slot with the initial value of the system flag set to * false. */ JS_ASSERT(((jsuword) clasp & 3) == 0); STOBJ_SET_SLOT(obj, JSSLOT_CLASS, PRIVATE_TO_JSVAL(clasp)); JS_ASSERT(!STOBJ_IS_SYSTEM(obj)); /* Initialize the remaining fixed slots. */ for (i = JSSLOT_PRIVATE; i != JS_INITIAL_NSLOTS; ++i) obj->fslots[i] = JSVAL_VOID; #ifdef DEBUG memset((uint8 *) obj + sizeof(JSObject), JS_FREE_PATTERN, objectSize - sizeof(JSObject)); #endif /* * Root obj to prevent it from being collected out from under this call to * js_NewObject. There's a possibilty of GC under the objectHook call-out * further below. */ JS_PUSH_TEMP_ROOT_OBJECT(cx, obj, &tvr); /* Always call the class's getObjectOps hook if it has one. */ ops = clasp->getObjectOps ? clasp->getObjectOps(cx, clasp) : &js_ObjectOps; /* * Default parent to the parent of the prototype, which was set from * the parent of the prototype's constructor. */ if (proto && !parent) STOBJ_SET_PARENT(obj, OBJ_GET_PARENT(cx, proto)); /* * 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))) { /* Share the given prototype's map. */ obj->map = js_HoldObjectMap(cx, map); } else { map = ops->newObjectMap(cx, 1, ops, clasp, obj); if (!map) goto bad; obj->map = map; /* Let ops->newObjectMap set freeslot so as to reserve slots. */ nslots = map->freeslot; JS_ASSERT(nslots >= JSSLOT_PRIVATE); if (nslots > JS_INITIAL_NSLOTS && !js_ReallocSlots(cx, obj, nslots, JS_TRUE)) { js_DropObjectMap(cx, map, obj); obj->map = NULL; goto bad; } } if (cx->debugHooks->objectHook) { JS_KEEP_ATOMS(cx->runtime); cx->debugHooks->objectHook(cx, obj, JS_TRUE, cx->debugHooks->objectHookData); JS_UNKEEP_ATOMS(cx->runtime); } out: JS_POP_TEMP_ROOT(cx, &tvr); cx->weakRoots.newborn[GCX_OBJECT] = obj; #ifdef INCLUDE_MOZILLA_DTRACE if (JAVASCRIPT_OBJECT_CREATE_ENABLED()) jsdtrace_object_create(cx, clasp, obj); if (JAVASCRIPT_OBJECT_CREATE_DONE_ENABLED()) jsdtrace_object_create_done(cx->fp, clasp); #endif return obj; bad: obj = NULL; goto out; earlybad: #ifdef INCLUDE_MOZILLA_DTRACE if (JAVASCRIPT_OBJECT_CREATE_ENABLED()) jsdtrace_object_create(cx, clasp, NULL); if (JAVASCRIPT_OBJECT_CREATE_DONE_ENABLED()) jsdtrace_object_create_done(cx->fp, clasp); #endif return NULL; } JS_BEGIN_EXTERN_C JS_STATIC_DLL_CALLBACK(JSObject *) js_InitNullClass(JSContext *cx, JSObject *obj) { JS_ASSERT(0); return NULL; } #define JS_PROTO(name,code,init) extern JSObject *init(JSContext *, JSObject *); #include "jsproto.tbl" #undef JS_PROTO static JSObjectOp lazy_prototype_init[JSProto_LIMIT] = { #define JS_PROTO(name,code,init) init, #include "jsproto.tbl" #undef JS_PROTO }; JS_END_EXTERN_C JSBool js_GetClassObject(JSContext *cx, JSObject *obj, JSProtoKey key, JSObject **objp) { JSBool ok; JSObject *tmp, *cobj; JSResolvingKey rkey; JSResolvingEntry *rentry; uint32 generation; JSObjectOp init; jsval v; while ((tmp = OBJ_GET_PARENT(cx, obj)) != NULL) obj = tmp; if (!(OBJ_GET_CLASS(cx, obj)->flags & JSCLASS_IS_GLOBAL)) { *objp = NULL; return JS_TRUE; } ok = JS_GetReservedSlot(cx, obj, key, &v); if (!ok) return JS_FALSE; if (!JSVAL_IS_PRIMITIVE(v)) { *objp = JSVAL_TO_OBJECT(v); return JS_TRUE; } rkey.obj = obj; rkey.id = ATOM_TO_JSID(cx->runtime->atomState.classAtoms[key]); if (!js_StartResolving(cx, &rkey, JSRESFLAG_LOOKUP, &rentry)) return JS_FALSE; if (!rentry) { /* Already caching key in obj -- suppress recursion. */ *objp = NULL; return JS_TRUE; } generation = cx->resolvingTable->generation; cobj = NULL; init = lazy_prototype_init[key]; if (init) { if (!init(cx, obj)) { ok = JS_FALSE; } else { ok = JS_GetReservedSlot(cx, obj, key, &v); if (ok && !JSVAL_IS_PRIMITIVE(v)) cobj = JSVAL_TO_OBJECT(v); } } js_StopResolving(cx, &rkey, JSRESFLAG_LOOKUP, rentry, generation); *objp = cobj; return ok; } JSBool js_SetClassObject(JSContext *cx, JSObject *obj, JSProtoKey key, JSObject *cobj) { JS_ASSERT(!OBJ_GET_PARENT(cx, obj)); if (!(OBJ_GET_CLASS(cx, obj)->flags & JSCLASS_IS_GLOBAL)) return JS_TRUE; return JS_SetReservedSlot(cx, obj, key, OBJECT_TO_JSVAL(cobj)); } JSBool js_FindClassObject(JSContext *cx, JSObject *start, jsid id, jsval *vp) { JSObject *obj, *cobj, *pobj; JSProtoKey key; JSProperty *prop; jsval v; JSScopeProperty *sprop; 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; } } OBJ_TO_INNER_OBJECT(cx, obj); if (!obj) return JS_FALSE; if (JSID_IS_INT(id)) { key = (JSProtoKey) JSID_TO_INT(id); JS_ASSERT(key != JSProto_Null); if (!js_GetClassObject(cx, obj, key, &cobj)) return JS_FALSE; if (cobj) { *vp = OBJECT_TO_JSVAL(cobj); return JS_TRUE; } id = ATOM_TO_JSID(cx->runtime->atomState.classAtoms[key]); } JS_ASSERT(OBJ_IS_NATIVE(obj)); if (js_LookupPropertyWithFlags(cx, obj, id, JSRESOLVE_CLASSNAME, &pobj, &prop) < 0) { return JS_FALSE; } v = JSVAL_VOID; if (prop) { if (OBJ_IS_NATIVE(pobj)) { sprop = (JSScopeProperty *) prop; if (SPROP_HAS_VALID_SLOT(sprop, OBJ_SCOPE(pobj))) { v = LOCKED_OBJ_GET_SLOT(pobj, sprop->slot); if (JSVAL_IS_PRIMITIVE(v)) v = JSVAL_VOID; } } OBJ_DROP_PROPERTY(cx, pobj, prop); } *vp = v; return JS_TRUE; } JSObject * js_ConstructObject(JSContext *cx, JSClass *clasp, JSObject *proto, JSObject *parent, uintN argc, jsval *argv) { jsid id; jsval cval, rval; JSTempValueRooter argtvr, tvr; JSObject *obj, *ctor; JS_PUSH_TEMP_ROOT(cx, argc, argv, &argtvr); if (!js_GetClassId(cx, clasp, &id) || !js_FindClassObject(cx, parent, id, &cval)) { JS_POP_TEMP_ROOT(cx, &argtvr); return NULL; } if (JSVAL_IS_PRIMITIVE(cval)) { js_ReportIsNotFunction(cx, &cval, JSV2F_CONSTRUCT | JSV2F_SEARCH_STACK); JS_POP_TEMP_ROOT(cx, &argtvr); 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); /* * 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)) { obj = NULL; goto out; } if (JSVAL_IS_OBJECT(rval)) proto = JSVAL_TO_OBJECT(rval); } obj = js_NewObject(cx, clasp, proto, parent, 0); if (!obj) goto out; if (!js_InternalConstruct(cx, obj, cval, argc, argv, &rval)) goto bad; if (JSVAL_IS_PRIMITIVE(rval)) goto out; obj = JSVAL_TO_OBJECT(rval); /* * If the instance's class differs from what was requested, throw a type * error. If the given class has both the JSCLASS_HAS_PRIVATE and the * JSCLASS_CONSTRUCT_PROTOTYPE flags, and the instance does not have its * private data set at this point, then the constructor was replaced and * we should throw a type error. */ if (OBJ_GET_CLASS(cx, obj) != clasp || (!(~clasp->flags & (JSCLASS_HAS_PRIVATE | JSCLASS_CONSTRUCT_PROTOTYPE)) && !JS_GetPrivate(cx, obj))) { JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_WRONG_CONSTRUCTOR, clasp->name); goto bad; } out: JS_POP_TEMP_ROOT(cx, &tvr); JS_POP_TEMP_ROOT(cx, &argtvr); return obj; bad: cx->weakRoots.newborn[GCX_OBJECT] = NULL; obj = NULL; goto out; } void js_FinalizeObject(JSContext *cx, JSObject *obj) { JSObjectMap *map; /* Cope with stillborn objects that have no map. */ map = obj->map; if (!map) return; if (cx->debugHooks->objectHook) { cx->debugHooks->objectHook(cx, obj, JS_FALSE, cx->debugHooks->objectHookData); } /* Finalize obj first, in case it needs map and slots. */ STOBJ_GET_CLASS(obj)->finalize(cx, obj); #ifdef INCLUDE_MOZILLA_DTRACE if (JAVASCRIPT_OBJECT_FINALIZE_ENABLED()) jsdtrace_object_finalize(obj); #endif /* Drop map and free slots. */ js_DropObjectMap(cx, map, obj); FreeSlots(cx, obj); } /* 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; 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) && clasp->reserveSlots) { /* Adjust map->freeslot to include computed reserved slots, if any. */ map->freeslot += clasp->reserveSlots(cx, obj); } if (map->freeslot >= STOBJ_NSLOTS(obj) && !js_ReallocSlots(cx, obj, map->freeslot + 1, JS_FALSE)) { return JS_FALSE; } /* js_ReallocSlots or js_FreeSlot should set the free slots to void. */ JS_ASSERT(STOBJ_GET_SLOT(obj, map->freeslot) == JSVAL_VOID); *slotp = map->freeslot++; return JS_TRUE; } void js_FreeSlot(JSContext *cx, JSObject *obj, uint32 slot) { JSObjectMap *map; map = obj->map; JS_ASSERT(!MAP_IS_NATIVE(map) || ((JSScope *)map)->object == obj); LOCKED_OBJ_SET_SLOT(obj, slot, JSVAL_VOID); if (map->freeslot == slot + 1) { map->freeslot = slot; /* When shrinking, js_ReallocSlots always returns true. */ js_ReallocSlots(cx, obj, slot, JS_FALSE); } } jsid js_CheckForStringIndex(jsid id, const jschar *cp, const jschar *end, 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 == end && (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 PurgeProtoChain(JSContext *cx, JSObject *obj, jsid id) { JSScope *scope; JSScopeProperty *sprop; while (obj) { if (!OBJ_IS_NATIVE(obj)) { obj = OBJ_GET_PROTO(cx, obj); continue; } JS_LOCK_OBJ(cx, obj); scope = OBJ_SCOPE(obj); sprop = SCOPE_GET_PROPERTY(scope, id); if (sprop) { SCOPE_MAKE_UNIQUE_SHAPE(cx, scope); JS_UNLOCK_SCOPE(cx, scope); return JS_TRUE; } obj = LOCKED_OBJ_GET_PROTO(scope->object); JS_UNLOCK_SCOPE(cx, scope); } return JS_FALSE; } static void PurgeScopeChain(JSContext *cx, JSObject *obj, jsid id) { PurgeProtoChain(cx, OBJ_GET_PROTO(cx, obj), id); while ((obj = OBJ_GET_PARENT(cx, obj)) != NULL) { if (PurgeProtoChain(cx, obj, id)) return; } } 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; /* * Purge the property cache of now-shadowed id in obj's scope chain. Do * this optimistically (assuming no failure below) before locking obj, so * we can lock the shadowed scope. */ PurgeScopeChain(cx, obj, id); JS_LOCK_OBJ(cx, obj); scope = js_GetMutableScope(cx, obj); if (!scope) { sprop = NULL; } else { /* 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); } 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_WRITE_BARRIER(cx, 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; JSScopeProperty *sprop; /* 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. */ sprop = NULL; if (attrs & (JSPROP_GETTER | JSPROP_SETTER)) { JSObject *pobj; JSProperty *prop; /* * 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; } else if (prop) { /* NB: call OBJ_DROP_PROPERTY, as pobj might not be native. */ OBJ_DROP_PROPERTY(cx, pobj, prop); prop = NULL; sprop = NULL; } } #endif /* JS_HAS_GETTER_SETTER */ /* * Purge the property cache of now-shadowed id in obj's scope chain. * Do this early, before locking obj to avoid nesting locks. */ PurgeScopeChain(cx, obj, id); /* 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; if (!sprop) { /* Add or replace an existing property 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_WRITE_BARRIER(cx, 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 (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 "object-detecting" in the sense used by web scripts, 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 += js_CodeSpec[op].length) { /* General case: a branch or equality op follows the access. */ op = (JSOp) *pc; if (js_CodeSpec[op].format & JOF_DETECTING) return JS_TRUE; switch (op) { case JSOP_NULL: /* * Special case #1: handle (document.all == null). Don't sweat * about JS1.2's revision of the equality operators here. */ if (++pc < endpc) return *pc == JSOP_EQ || *pc == JSOP_NE; return JS_FALSE; case JSOP_NAME: /* * Special case #2: handle (document.all == undefined). Don't * worry about someone redefining undefined, which was added by * Edition 3, so is read/write for backward compatibility. */ GET_ATOM_FROM_BYTECODE(script, pc, 0, atom); 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_STRICTEQ || op == JSOP_STRICTNE; } return JS_FALSE; case JSOP_GROUP: break; default: /* * At this point, anything but an extended atom index prefix means * we're not detecting. */ if (!(js_CodeSpec[op].format & JOF_INDEXBASE)) return JS_FALSE; 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) >= 0; } #ifdef JS_SCOPE_DEPTH_METER # define SCOPE_DEPTH_ACCUM(bs,val) JS_BASIC_STATS_ACCUM(bs,val) #else # define SCOPE_DEPTH_ACCUM(bs,val) /* nothing */ #endif int js_LookupPropertyWithFlags(JSContext *cx, JSObject *obj, jsid id, uintN flags, JSObject **objp, JSProperty **propp) { JSObject *start, *obj2, *proto; int protoIndex; 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; /* Convert string indices to integers if appropriate. */ CHECK_FOR_STRING_INDEX(id); JS_COUNT_OPERATION(cx, JSOW_LOOKUP_PROPERTY); /* Search scopes starting with obj and following the prototype link. */ start = obj; for (protoIndex = 0; ; protoIndex++) { 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 -1; } if (!entry) { /* Already resolving id in obj -- suppress 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 && cx->fp->regs) { pc = cx->fp->regs->pc; cs = &js_CodeSpec[*pc]; format = cs->format; if (JOF_MODE(format) != 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); } protoIndex = 0; for (proto = start; proto && proto != obj2; proto = OBJ_GET_PROTO(cx, proto)) { protoIndex++; } 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) return -1; if (*propp) return protoIndex; } } if (sprop) { SCOPE_DEPTH_ACCUM(&cx->runtime->protoLookupDepthStats, protoIndex); JS_ASSERT(OBJ_SCOPE(obj) == scope); *objp = scope->object; /* XXXbe hide in jsscope.[ch] */ *propp = (JSProperty *) sprop; return protoIndex; } proto = LOCKED_OBJ_GET_PROTO(obj); JS_UNLOCK_OBJ(cx, obj); if (!proto) break; if (!OBJ_IS_NATIVE(proto)) { if (!OBJ_LOOKUP_PROPERTY(cx, proto, id, objp, propp)) return -1; return protoIndex + 1; } obj = proto; } out: *objp = NULL; *propp = NULL; return protoIndex; } int js_FindPropertyHelper(JSContext *cx, jsid id, JSObject **objp, JSObject **pobjp, JSProperty **propp, JSPropCacheEntry **entryp) { JSObject *obj, *pobj, *lastobj; uint32 type; int scopeIndex, protoIndex; JSProperty *prop; JSScopeProperty *sprop; obj = cx->fp->scopeChain; type = OBJ_SCOPE(obj)->shape; for (scopeIndex = 0; ; scopeIndex++) { if (obj->map->ops->lookupProperty == js_LookupProperty) { protoIndex = js_LookupPropertyWithFlags(cx, obj, id, 0, &pobj, &prop); } else { if (!OBJ_LOOKUP_PROPERTY(cx, obj, id, &pobj, &prop)) return -1; protoIndex = -1; } if (prop) { if (entryp) { if (protoIndex >= 0 && OBJ_IS_NATIVE(pobj)) { sprop = (JSScopeProperty *) prop; js_FillPropertyCache(cx, cx->fp->scopeChain, type, scopeIndex, protoIndex, pobj, sprop, entryp); } else { PCMETER(JS_PROPERTY_CACHE(cx).nofills++); *entryp = NULL; } } SCOPE_DEPTH_ACCUM(&rt->scopeSearchDepthStats, scopeIndex); *objp = obj; *pobjp = pobj; *propp = prop; return scopeIndex; } lastobj = obj; obj = OBJ_GET_PARENT(cx, obj); if (!obj) break; } *objp = lastobj; *pobjp = NULL; *propp = NULL; return scopeIndex; } JS_FRIEND_API(JSBool) js_FindProperty(JSContext *cx, jsid id, JSObject **objp, JSObject **pobjp, JSProperty **propp) { return js_FindPropertyHelper(cx, id, objp, pobjp, propp, NULL) >= 0; } JSObject * js_FindIdentifierBase(JSContext *cx, jsid id, JSPropCacheEntry *entry) { JSObject *obj, *pobj; JSProperty *prop; /* * Look for id's property along the "with" statement chain and the * statically-linked scope chain. */ if (js_FindPropertyHelper(cx, id, &obj, &pobj, &prop, &entry) < 0) 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)); const char *bytes = js_GetStringBytes(cx, str); if (!bytes || !JS_ReportErrorFlagsAndNumber(cx, JSREPORT_WARNING | JSREPORT_STRICT, js_GetErrorMessage, NULL, JSMSG_UNDECLARED_VAR, bytes)) { return NULL; } } return obj; } JSBool js_NativeGet(JSContext *cx, JSObject *obj, JSObject *pobj, JSScopeProperty *sprop, jsval *vp) { JSScope *scope; uint32 slot; int32 sample; JSTempValueRooter tvr; JSBool ok; JS_ASSERT(OBJ_IS_NATIVE(pobj)); JS_ASSERT(JS_IS_OBJ_LOCKED(cx, pobj)); scope = OBJ_SCOPE(pobj); JS_ASSERT(scope->object == pobj); slot = sprop->slot; *vp = (slot != SPROP_INVALID_SLOT) ? LOCKED_OBJ_GET_SLOT(pobj, slot) : JSVAL_VOID; if (SPROP_HAS_STUB_GETTER(sprop)) return JS_TRUE; sample = cx->runtime->propertyRemovals; JS_UNLOCK_SCOPE(cx, scope); JS_PUSH_TEMP_ROOT_SPROP(cx, sprop, &tvr); ok = SPROP_GET(cx, sprop, obj, pobj, vp); JS_POP_TEMP_ROOT(cx, &tvr); if (!ok) return JS_FALSE; JS_LOCK_SCOPE(cx, scope); JS_ASSERT(scope->object == pobj); if (SLOT_IN_SCOPE(slot, scope) && (JS_LIKELY(cx->runtime->propertyRemovals == sample) || SCOPE_GET_PROPERTY(scope, sprop->id) == sprop)) { LOCKED_OBJ_SET_SLOT(pobj, slot, *vp); } return JS_TRUE; } JSBool js_NativeSet(JSContext *cx, JSObject *obj, JSScopeProperty *sprop, jsval *vp) { JSScope *scope; uint32 slot; jsval pval; int32 sample; JSTempValueRooter tvr; JSBool ok; JS_ASSERT(OBJ_IS_NATIVE(obj)); JS_ASSERT(JS_IS_OBJ_LOCKED(cx, obj)); scope = OBJ_SCOPE(obj); JS_ASSERT(scope->object == obj); slot = sprop->slot; if (slot != SPROP_INVALID_SLOT) { pval = LOCKED_OBJ_GET_SLOT(obj, slot); /* If sprop has a stub setter, keep scope locked and just store *vp. */ if (SPROP_HAS_STUB_SETTER(sprop)) goto set_slot; } else { /* * Allow API consumers to create shared properties with stub setters. * Such properties lack value storage, so setting them is like writing * to /dev/null. */ if (SPROP_HAS_STUB_SETTER(sprop)) return JS_TRUE; pval = JSVAL_VOID; } sample = cx->runtime->propertyRemovals; JS_UNLOCK_SCOPE(cx, scope); JS_PUSH_TEMP_ROOT_SPROP(cx, sprop, &tvr); ok = SPROP_SET(cx, sprop, obj, obj, vp); JS_POP_TEMP_ROOT(cx, &tvr); if (!ok) return JS_FALSE; JS_LOCK_SCOPE(cx, scope); JS_ASSERT(scope->object == obj); if (SLOT_IN_SCOPE(slot, scope) && (JS_LIKELY(cx->runtime->propertyRemovals == sample) || SCOPE_GET_PROPERTY(scope, sprop->id) == sprop)) { set_slot: LOCKED_OBJ_WRITE_BARRIER(cx, obj, slot, *vp); } return JS_TRUE; } JSBool js_GetPropertyHelper(JSContext *cx, JSObject *obj, jsid id, jsval *vp, JSPropCacheEntry **entryp) { uint32 type; int protoIndex; JSObject *obj2; JSProperty *prop; JSScopeProperty *sprop; /* Convert string indices to integers if appropriate. */ CHECK_FOR_STRING_INDEX(id); JS_COUNT_OPERATION(cx, JSOW_GET_PROPERTY); type = OBJ_SCOPE(obj)->shape; protoIndex = js_LookupPropertyWithFlags(cx, obj, id, 0, &obj2, &prop); if (protoIndex < 0) return JS_FALSE; if (!prop) { jsbytecode *pc; *vp = JSVAL_VOID; if (!OBJ_GET_CLASS(cx, obj)->getProperty(cx, obj, ID_TO_VALUE(id), vp)) return JS_FALSE; if (entryp) { PCMETER(JS_PROPERTY_CACHE(cx).nofills++); *entryp = NULL; } /* * Give a strict warning if foo.bar is evaluated by a script for an * object foo with no property named 'bar'. */ if (JSVAL_IS_VOID(*vp) && cx->fp && cx->fp->regs) { JSOp op; uintN flags; pc = cx->fp->regs->pc; op = (JSOp) *pc; if (op == JSOP_GETXPROP) { flags = JSREPORT_ERROR; } else { if (!JS_HAS_STRICT_OPTION(cx) || (op != JSOP_GETPROP && op != JSOP_GETELEM)) { return JS_TRUE; } /* * XXX do not warn about missing __iterator__ as the function * may be called from JS_GetMethodById. See bug 355145. */ if (id == ATOM_TO_JSID(cx->runtime->atomState.iteratorAtom)) return JS_TRUE; /* Kludge to allow (typeof foo == "undefined") tests. */ JS_ASSERT(cx->fp->script); pc += js_CodeSpec[op].length; if (Detecting(cx, pc)) return JS_TRUE; flags = JSREPORT_WARNING | JSREPORT_STRICT; } /* Ok, bad undefined property reference: whine about it. */ if (!js_ReportValueErrorFlags(cx, flags, JSMSG_UNDEFINED_PROP, JSDVG_IGNORE_STACK, ID_TO_VALUE(id), NULL, NULL, NULL)) { 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); } sprop = (JSScopeProperty *) prop; if (!js_NativeGet(cx, obj, obj2, sprop, vp)) return JS_FALSE; if (entryp) { js_FillPropertyCache(cx, obj, type, 0, protoIndex, obj2, sprop, entryp); } JS_UNLOCK_OBJ(cx, obj2); return JS_TRUE; } JSBool js_GetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp) { return js_GetPropertyHelper(cx, obj, id, vp, NULL); } JSBool js_SetPropertyHelper(JSContext *cx, JSObject *obj, jsid id, jsval *vp, JSPropCacheEntry **entryp) { uint32 type; int protoIndex; JSObject *pobj; JSProperty *prop; JSScopeProperty *sprop; JSScope *scope; uintN attrs, flags; intN shortid; JSClass *clasp; JSPropertyOp getter, setter; /* Convert string indices to integers if appropriate. */ CHECK_FOR_STRING_INDEX(id); JS_COUNT_OPERATION(cx, JSOW_SET_PROPERTY); type = OBJ_SCOPE(obj)->shape; protoIndex = js_LookupPropertyWithFlags(cx, obj, id, 0, &pobj, &prop); if (protoIndex < 0) 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) { if (!JS_HAS_STRICT_OPTION(cx)) { /* Just return true per ECMA if not in strict mode. */ PCMETER(!entryp || JS_PROPERTY_CACHE(cx).rofills++); 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. * * But if we are shadowing (not sharing) the proto-property, then * we need to regenerate the property cache shape id for scope, in * case the cache contains the old type in an entry value that was * filled by a get on obj that delegated up the prototype chain to * pobj. Once we've shadowed the proto-property, that cache entry * must not be hit. */ if (!(attrs & JSPROP_SHARED)) SCOPE_MAKE_UNIQUE_SHAPE(cx, scope); JS_UNLOCK_SCOPE(cx, scope); /* * Don't clone a shared prototype property. Don't fill it in the * property cache either, since the JSOP_SETPROP/JSOP_SETNAME code * in js_Interpret does not handle shared or prototype properties. * Shared prototype properties require more hit qualification than * the fast-path code for those ops, which is targeted on direct, * slot-based properties. */ if (attrs & JSPROP_SHARED) { if (entryp) { PCMETER(JS_PROPERTY_CACHE(cx).nofills++); *entryp = NULL; } if (SPROP_HAS_STUB_SETTER(sprop) && !(sprop->attrs & JSPROP_GETTER)) { return JS_TRUE; } 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; } /* * Purge the property cache of now-shadowed id in obj's scope chain. * Do this early, before locking obj to avoid nesting locks. */ PurgeScopeChain(cx, obj, id); /* 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); } if (!js_NativeSet(cx, obj, sprop, vp)) return JS_FALSE; if (entryp) { if (!(attrs & JSPROP_SHARED)) js_FillPropertyCache(cx, obj, type, 0, 0, obj, sprop, entryp); else PCMETER(JS_PROPERTY_CACHE(cx).nofills++); } JS_UNLOCK_SCOPE(cx, scope); return JS_TRUE; read_only_error: return js_ReportValueErrorFlags(cx, flags, JSMSG_READ_ONLY, JSDVG_IGNORE_STACK, ID_TO_VALUE(id), NULL, NULL, NULL); } JSBool js_SetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp) { return js_SetPropertyHelper(cx, obj, id, vp, NULL); } 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, 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) { JSObject *proto; JSProperty *prop; JSScopeProperty *sprop; JSScope *scope; JSBool ok; *rval = JSVAL_TRUE; /* Convert string indices to integers if appropriate. */ CHECK_FOR_STRING_INDEX(id); JS_COUNT_OPERATION(cx, JSOW_DELETE_PROPERTY); 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); *rval = JSVAL_FALSE; return JS_TRUE; } /* 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)); ok = js_RemoveScopeProperty(cx, scope, id); OBJ_DROP_PROPERTY(cx, obj, prop); return ok; } JSBool js_DefaultValue(JSContext *cx, JSObject *obj, JSType hint, jsval *vp) { jsval v, save; JSString *str; v = save = 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; } 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; } if (!js_TryMethod(cx, obj, cx->runtime->atomState.toStringAtom, 0, NULL, &v)) { return JS_FALSE; } } break; } if (!JSVAL_IS_PRIMITIVE(v)) { /* Avoid recursive death when decompiling in js_ReportValueError. */ 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); js_ReportValueError2(cx, JSMSG_CANT_CONVERT_TO, JSDVG_SEARCH_STACK, save, 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 */ struct JSNativeIteratorState { jsint next_index; /* index into jsid array */ JSIdArray *ida; /* all property ids in enumeration */ JSNativeIteratorState *next; /* double-linked list support */ JSNativeIteratorState **prevp; }; /* * 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) { JSRuntime *rt; JSObject *proto; JSClass *clasp; JSEnumerateOp enumerate; JSScopeProperty *sprop, *lastProp; jsint i, length; JSScope *scope; JSIdArray *ida; JSNativeIteratorState *state; rt = cx->runtime; clasp = OBJ_GET_CLASS(cx, obj); enumerate = clasp->enumerate; if (clasp->flags & JSCLASS_NEW_ENUMERATE) { JS_ASSERT(enumerate != JS_EnumerateStub); 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 ((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 ((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; JS_LOCK_RUNTIME(rt); state->next = rt->nativeIteratorStates; if (state->next) state->next->prevp = &state->next; state->prevp = &rt->nativeIteratorStates; *state->prevp = state; JS_UNLOCK_RUNTIME(rt); *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_LOCK_RUNTIME(rt); JS_ASSERT(rt->nativeIteratorStates); JS_ASSERT(*state->prevp == state); if (state->next) { JS_ASSERT(state->next->prevp == &state->next); state->next->prevp = state->prevp; } *state->prevp = state->next; JS_UNLOCK_RUNTIME(rt); JS_DestroyIdArray(cx, state->ida); JS_free(cx, state); *statep = JSVAL_NULL; break; } return JS_TRUE; } void js_TraceNativeIteratorStates(JSTracer *trc) { JSNativeIteratorState *state; jsid *cursor, *end, id; state = trc->context->runtime->nativeIteratorStates; if (!state) return; do { JS_ASSERT(*state->prevp == state); cursor = state->ida->vector; end = cursor + state->ida->length; for (; cursor != end; ++cursor) { id = *cursor; TRACE_ID(trc, id); } } while ((state = state->next) != NULL); } JSBool js_CheckAccess(JSContext *cx, JSObject *obj, jsid id, JSAccessMode mode, jsval *vp, uintN *attrsp) { JSBool writing; JSObject *pobj; JSProperty *prop; JSClass *clasp; JSScopeProperty *sprop; JSCheckAccessOp check; writing = (mode & JSACC_WRITE) != 0; switch (mode & JSACC_TYPEMASK) { case JSACC_PROTO: pobj = obj; if (!writing) *vp = OBJECT_TO_JSVAL(OBJ_GET_PROTO(cx, obj)); *attrsp = JSPROP_PERMANENT; break; case JSACC_PARENT: JS_ASSERT(!writing); pobj = obj; *vp = OBJECT_TO_JSVAL(OBJ_GET_PARENT(cx, obj)); *attrsp = JSPROP_READONLY | JSPROP_PERMANENT; break; default: if (!OBJ_LOOKUP_PROPERTY(cx, obj, id, &pobj, &prop)) return JS_FALSE; if (!prop) { if (!writing) *vp = JSVAL_VOID; *attrsp = 0; pobj = obj; break; } if (!OBJ_IS_NATIVE(pobj)) { OBJ_DROP_PROPERTY(cx, pobj, prop); /* Avoid diverging for non-natives that reuse js_CheckAccess. */ if (pobj->map->ops->checkAccess == js_CheckAccess) { if (!writing) *vp = JSVAL_VOID; break; } return OBJ_CHECK_ACCESS(cx, pobj, id, mode, vp, attrsp); } sprop = (JSScopeProperty *)prop; *attrsp = sprop->attrs; if (!writing) { *vp = (SPROP_HAS_VALID_SLOT(sprop, OBJ_SCOPE(pobj))) ? LOCKED_OBJ_GET_SLOT(pobj, sprop->slot) : JSVAL_VOID; } OBJ_DROP_PROPERTY(cx, pobj, prop); } /* * 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 = OBJ_GET_CLASS(cx, pobj); check = clasp->checkAccess; if (!check) check = cx->runtime->checkObjectAccess; return !check || check(cx, pobj, ID_TO_VALUE(id), mode, vp); } #ifdef JS_THREADSAFE void js_DropProperty(JSContext *cx, JSObject *obj, JSProperty *prop) { JS_UNLOCK_OBJ(cx, obj); } #endif #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 (VALUE_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 js_ReportIsNotFunction(cx, &argv[-2], cx->fp->flags & JSFRAME_ITERATOR); 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 (VALUE_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 js_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; 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 (VALUE_IS_FUNCTION(cx, fval)) { if (!js_InternalCall(cx, obj, fval, 1, &v, &rval)) return JS_FALSE; *bp = js_ValueToBoolean(rval); return JS_TRUE; } } #endif js_ReportValueError(cx, JSMSG_BAD_INSTANCEOF_RHS, JSDVG_SEARCH_STACK, OBJECT_TO_JSVAL(obj), NULL); 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, JSObject *scope, jsid id, JSObject **protop) { jsval v; JSObject *ctor; if (!js_FindClassObject(cx, scope, id, &v)) return JS_FALSE; if (VALUE_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->weakRoots.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_TO_JSID(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_TO_JSID(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_PrimitiveToObject(JSContext *cx, jsval *vp) { JSClass *clasp; JSObject *obj; /* Table to map primitive value's tag into the corresponding class. */ JS_STATIC_ASSERT(JSVAL_INT == 1); JS_STATIC_ASSERT(JSVAL_DOUBLE == 2); JS_STATIC_ASSERT(JSVAL_STRING == 4); JS_STATIC_ASSERT(JSVAL_BOOLEAN == 6); static JSClass *const PrimitiveClasses[] = { &js_NumberClass, /* INT */ &js_NumberClass, /* DOUBLE */ &js_NumberClass, /* INT */ &js_StringClass, /* STRING */ &js_NumberClass, /* INT */ &js_BooleanClass, /* BOOLEAN */ &js_NumberClass /* INT */ }; JS_ASSERT(!JSVAL_IS_OBJECT(*vp)); JS_ASSERT(*vp != JSVAL_VOID); clasp = PrimitiveClasses[JSVAL_TAG(*vp) - 1]; obj = js_NewObject(cx, clasp, NULL, NULL, 0); if (!obj) return JS_FALSE; STOBJ_SET_SLOT(obj, JSSLOT_PRIVATE, *vp); *vp = OBJECT_TO_JSVAL(obj); return JS_TRUE; } 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 (!js_PrimitiveToObject(cx, &v)) return JS_FALSE; obj = JSVAL_TO_OBJECT(v); } *objp = obj; return JS_TRUE; } JSObject * js_ValueToNonNullObject(JSContext *cx, jsval v) { JSObject *obj; if (!js_ValueToObject(cx, v, &obj)) return NULL; if (!obj) js_ReportIsNullOrUndefined(cx, JSDVG_SEARCH_STACK, v, NULL); return obj; } JSBool js_TryValueOf(JSContext *cx, JSObject *obj, JSType type, jsval *rval) { jsval argv[1]; argv[0] = ATOM_KEY(cx->runtime->atomState.typeAtoms[type]); return js_TryMethod(cx, obj, cx->runtime->atomState.valueOfAtom, 1, argv, rval); } JSBool js_TryMethod(JSContext *cx, JSObject *obj, JSAtom *atom, uintN argc, jsval *argv, jsval *rval) { JSErrorReporter older; jsid id; jsval fval; JSBool ok; JS_CHECK_RECURSION(cx, 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); id = ATOM_TO_JSID(atom); fval = JSVAL_VOID; #if JS_HAS_XML_SUPPORT if (OBJECT_IS_XML(cx, obj)) { JSXMLObjectOps *ops; ops = (JSXMLObjectOps *) obj->map->ops; obj = ops->getMethod(cx, obj, id, &fval); ok = (obj != NULL); } else #endif { ok = OBJ_GET_PROPERTY(cx, obj, id, &fval); } if (!ok) JS_ClearPendingException(cx); JS_SetErrorReporter(cx, older); return JSVAL_IS_PRIMITIVE(fval) || js_InternalCall(cx, obj, fval, argc, argv, rval); } #if JS_HAS_XDR JSBool js_XDRObject(JSXDRState *xdr, JSObject **objp) { JSContext *cx; JSAtom *atom; JSClass *clasp; uint32 classId, classDef; JSProtoKey protoKey; jsid classKey; JSObject *proto; cx = xdr->cx; atom = NULL; if (xdr->mode == JSXDR_ENCODE) { clasp = OBJ_GET_CLASS(cx, *objp); classId = JS_XDRFindClassIdByName(xdr, clasp->name); classDef = !classId; if (classDef) { if (!JS_XDRRegisterClass(xdr, clasp, &classId)) return JS_FALSE; protoKey = JSCLASS_CACHED_PROTO_KEY(clasp); if (protoKey != JSProto_Null) { classDef |= (protoKey << 1); } else { atom = js_Atomize(cx, clasp->name, strlen(clasp->name), 0); if (!atom) return JS_FALSE; } } } else { clasp = NULL; /* quell GCC overwarning */ classDef = 0; } /* * XDR a flag word, which could be 0 for a class use, in which case no * name follows, only the id in xdr's class registry; 1 for a class def, * in which case the flag word is followed by the class name transferred * from or to atom; or a value greater than 1, an odd number that when * divided by two yields the JSProtoKey for class. In the last case, as * in the 0 classDef case, no name is transferred via atom. */ if (!JS_XDRUint32(xdr, &classDef)) return JS_FALSE; if (classDef == 1 && !js_XDRStringAtom(xdr, &atom)) return JS_FALSE; if (!JS_XDRUint32(xdr, &classId)) return JS_FALSE; if (xdr->mode == JSXDR_DECODE) { if (classDef) { /* NB: we know that JSProto_Null is 0 here, for backward compat. */ protoKey = (JSProtoKey) (classDef >> 1); classKey = (protoKey != JSProto_Null) ? INT_TO_JSID(protoKey) : ATOM_TO_JSID(atom); if (!js_GetClassPrototype(cx, NULL, classKey, &proto)) return JS_FALSE; clasp = OBJ_GET_CLASS(cx, proto); if (!JS_XDRRegisterClass(xdr, clasp, &classId)) return JS_FALSE; } 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); return JS_FALSE; } } } if (!clasp->xdrObject) { JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CANT_XDR_CLASS, clasp->name); return JS_FALSE; } return clasp->xdrObject(xdr, objp); } #endif /* JS_HAS_XDR */ #ifdef JS_DUMP_SCOPE_METERS #include JSBasicStats js_entry_count_bs = JS_INIT_STATIC_BASIC_STATS; static void MeterEntryCount(uintN count) { JS_BASIC_STATS_ACCUM(&js_entry_count_bs, count); } void js_DumpScopeMeters(JSRuntime *rt) { static FILE *logfp; if (!logfp) logfp = fopen("/tmp/scope.stats", "a"); { double mean, sigma; mean = JS_MeanAndStdDevBS(&js_entry_count_bs, &sigma); fprintf(logfp, "scopes %u entries %g mean %g sigma %g max %u", js_entry_count_bs.num, js_entry_count_bs.sum, mean, sigma, js_entry_count_bs.max); } JS_DumpHistogram(&js_entry_count_bs, logfp); JS_BASIC_STATS_INIT(&js_entry_count_bs); fflush(logfp); } #endif #ifdef DEBUG void js_PrintObjectSlotName(JSTracer *trc, char *buf, size_t bufsize) { JSObject *obj; uint32 slot; JSScope *scope; jsval nval; JSScopeProperty *sprop; JSClass *clasp; uint32 key; const char *slotname; JS_ASSERT(trc->debugPrinter == js_PrintObjectSlotName); obj = (JSObject *)trc->debugPrintArg; slot = (uint32)trc->debugPrintIndex; if (OBJ_IS_NATIVE(obj)) { scope = OBJ_SCOPE(obj); sprop = SCOPE_LAST_PROP(scope); while (sprop && sprop->slot != slot) sprop = sprop->parent; } else { sprop = NULL; } if (!sprop) { switch (slot) { case JSSLOT_PROTO: JS_snprintf(buf, bufsize, "__proto__"); break; case JSSLOT_PARENT: JS_snprintf(buf, bufsize, "__parent__"); break; default: slotname = NULL; clasp = LOCKED_OBJ_GET_CLASS(obj); if (clasp->flags & JSCLASS_IS_GLOBAL) { key = slot - JSSLOT_START(clasp); #define JS_PROTO(name,code,init) \ if ((code) == key) { slotname = js_##name##_str; goto found; } #include "jsproto.tbl" #undef JS_PROTO } found: if (slotname) JS_snprintf(buf, bufsize, "CLASS_OBJECT(%s)", slotname); else JS_snprintf(buf, bufsize, "**UNKNOWN SLOT %ld**", (long)slot); break; } } else { nval = ID_TO_VALUE(sprop->id); if (JSVAL_IS_INT(nval)) { JS_snprintf(buf, bufsize, "%ld", (long)JSVAL_TO_INT(nval)); } else if (JSVAL_IS_STRING(nval)) { js_PutEscapedString(buf, bufsize, JSVAL_TO_STRING(nval), 0); } else { JS_snprintf(buf, bufsize, "**FINALIZED ATOM KEY**"); } } } #endif void js_TraceObject(JSTracer *trc, JSObject *obj) { JSContext *cx; JSScope *scope; JSBool traceScope; JSScopeProperty *sprop; JSClass *clasp; size_t nslots, i; jsval v; JS_ASSERT(OBJ_IS_NATIVE(obj)); cx = trc->context; scope = OBJ_SCOPE(obj); traceScope = (scope->object == obj); if (!traceScope) { JSObject *pobj = obj; /* * Because obj does not own scope, we should be able to assert that an * object on obj's prototype chain does -- or scope's properties might * go untraced. It indeed turns out that you can disconnect an object * from the prototype object whose scope it shares, so we may have to * mark scope even though scope->object != obj. */ while ((pobj = LOCKED_OBJ_GET_PROTO(pobj)) != NULL) { if (pobj == scope->object) break; } JS_ASSERT_IF(pobj, OBJ_SCOPE(pobj) == scope); traceScope = !pobj; } if (traceScope) { #ifdef JS_DUMP_SCOPE_METERS MeterEntryCount(scope->entryCount); #endif sprop = SCOPE_LAST_PROP(scope); if (sprop) { JS_ASSERT(SCOPE_HAS_PROPERTY(scope, sprop)); /* Regenerate property cache shape ids if GC'ing. */ if (IS_GC_MARKING_TRACER(trc)) { uint32 shape, oldshape; shape = ++cx->runtime->shapeGen; JS_ASSERT(shape != 0); if (!(sprop->flags & SPROP_MARK)) { oldshape = sprop->shape; sprop->shape = shape; sprop->flags |= SPROP_FLAG_SHAPE_REGEN; if (scope->shape != oldshape) { shape = ++cx->runtime->shapeGen; JS_ASSERT(shape != 0); } } scope->shape = shape; } /* Trace scope's property tree ancestor line. */ do { if (SCOPE_HAD_MIDDLE_DELETE(scope) && !SCOPE_HAS_PROPERTY(scope, sprop)) { continue; } TRACE_SCOPE_PROPERTY(trc, sprop); } while ((sprop = sprop->parent) != NULL); } } if (!JS_CLIST_IS_EMPTY(&cx->runtime->watchPointList)) js_TraceWatchPoints(trc, obj); /* No one runs while the GC is running, so we can use LOCKED_... here. */ clasp = LOCKED_OBJ_GET_CLASS(obj); if (clasp->mark) { if (clasp->flags & JSCLASS_MARK_IS_TRACE) ((JSTraceOp) clasp->mark)(trc, obj); else if (IS_GC_MARKING_TRACER(trc)) (void) clasp->mark(cx, obj, trc); } /* * An unmutated object that shares a prototype object's scope. We can't * tell how many slots are in use in obj by looking at its scope, so we * use STOBJ_NSLOTS(obj). * * NB: In case clasp->mark mutates something, leave this code here -- * don't move it up and unify it with the |if (!traceScope)| section * above. */ nslots = STOBJ_NSLOTS(obj); if (scope->object == obj && scope->map.freeslot < nslots) nslots = scope->map.freeslot; for (i = 0; i != nslots; ++i) { v = STOBJ_GET_SLOT(obj, i); if (JSVAL_IS_TRACEABLE(v)) { JS_SET_TRACING_DETAILS(trc, js_PrintObjectSlotName, obj, i); JS_CallTracer(trc, JSVAL_TO_TRACEABLE(v), JSVAL_TRACE_KIND(v)); } } } void js_Clear(JSContext *cx, JSObject *obj) { JSScope *scope; 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) { /* 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 = STOBJ_NSLOTS(obj); n = JSSLOT_FREE(LOCKED_OBJ_GET_CLASS(obj)); while (--i >= n) STOBJ_SET_SLOT(obj, 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 < STOBJ_NSLOTS(obj)) ? STOBJ_GET_SLOT(obj, 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; JS_LOCK_OBJ(cx, obj); scope = OBJ_SCOPE(obj); if (slot >= JS_INITIAL_NSLOTS && !obj->dslots) { /* * 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 obj->dslots will be null. If obj shares a * prototype's scope, then we cannot update scope->map here. Instead * we rely on STOBJ_NSLOTS(obj) to get the number of available slots * in obj after we allocate dynamic slots. * * See js_TraceObject, before the slot tracing, where we make a special * case for unmutated (scope->object != obj) objects. */ clasp = LOCKED_OBJ_GET_CLASS(obj); nslots = JSSLOT_FREE(clasp); if (clasp->reserveSlots) nslots += clasp->reserveSlots(cx, obj); JS_ASSERT(slot < nslots); if (!js_ReallocSlots(cx, obj, nslots, JS_TRUE)) { JS_UNLOCK_SCOPE(cx, scope); return JS_FALSE; } } /* 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; STOBJ_SET_SLOT(obj, slot, v); JS_UNLOCK_SCOPE(cx, scope); return JS_TRUE; } JSObject * js_GetWrappedObject(JSContext *cx, JSObject *obj) { JSClass *clasp; clasp = OBJ_GET_CLASS(cx, obj); if (clasp->flags & JSCLASS_IS_EXTENDED) { JSExtendedClass *xclasp; JSObject *obj2; xclasp = (JSExtendedClass *)clasp; if (xclasp->wrappedObject && (obj2 = xclasp->wrappedObject(cx, obj))) return obj2; } return obj; } #ifdef DEBUG /* Routines to print out values during debugging. */ void printChar(jschar *cp) { fprintf(stderr, "jschar* (%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 (%p) \"", (void *)str); JSSTRING_CHARS_AND_LENGTH(str, s, n); for (i=0; i < n; i++) fputc(s[i], stderr); fputc('"', stderr); fputc('\n', stderr); } void printVal(JSContext *cx, jsval val); void printObj(JSContext *cx, JSObject *obj) { jsuint i, slots; jsval val; JSClass *clasp; fprintf(stderr, "object %p\n", (void *) obj); clasp = OBJ_GET_CLASS(cx, obj); fprintf(stderr, "class %p %s\n", (void *)clasp, clasp->name); if (OBJ_IS_DENSE_ARRAY(cx, obj)) { slots = JS_MIN((jsuint) obj->fslots[JSSLOT_ARRAY_LENGTH], ARRAY_DENSE_LENGTH(obj)); for (i = 0; i < slots; i++) { val = obj->dslots[i]; if (JSVAL_IS_OBJECT(val)) fprintf(stderr, "object %p\n", (void*)JSVAL_TO_OBJECT(val)); else printVal(cx, val); } return; } slots = STOBJ_NSLOTS(obj); for (i=0; i < slots; i++) { fprintf(stderr, "slot %3d ", i); val = STOBJ_GET_SLOT(obj, i); if (JSVAL_IS_OBJECT(val)) fprintf(stderr, "object %p\n", (void *)JSVAL_TO_OBJECT(val)); else printVal(cx, val); } } void printVal(JSContext *cx, jsval val) { fprintf(stderr, "val %d (%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 if (val == JSVAL_HOLE) { fprintf(stderr, "hole\n"); } 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 (%p) is ", (int)id, (void *)id); printVal(cx, ID_TO_VALUE(id)); } void printAtom(JSAtom *atom) { printString(ATOM_TO_STRING(atom)); } #endif