kamp
/
RetroZilla
mirror of https://github.com/rn10950/RetroZilla.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
RetroZilla/js/src/jsobj.c

5090 lines
157 KiB
C
Raw Blame History

/* -*- 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 <stdlib.h>
#include <string.h>
#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 "jsfun.h"
#include "jsgc.h"
#include "jsinterp.h"
#include "jslock.h"
#include "jsnum.h"
#include "jsobj.h"
#include "jsscan.h"
#include "jsscope.h"
#include "jsscript.h"
#include "jsstr.h"
#include "jsopcode.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 JS_THREADSAFE
#define NATIVE_DROP_PROPERTY js_DropProperty
extern void
js_DropProperty(JSContext *cx, JSObject *obj, JSProperty *prop);
#else
#define NATIVE_DROP_PROPERTY NULL
#endif
JS_FRIEND_DATA(JSObjectOps) js_ObjectOps = {
js_NewObjectMap, js_DestroyObjectMap,
js_LookupProperty, js_DefineProperty,
js_GetProperty, js_SetProperty,
js_GetAttributes, js_SetAttributes,
js_DeleteProperty, js_DefaultValue,
js_Enumerate, js_CheckAccess,
NULL, NATIVE_DROP_PROPERTY,
js_Call, js_Construct,
NULL, js_HasInstance,
js_SetProtoOrParent, js_SetProtoOrParent,
js_Mark, js_Clear,
js_GetRequiredSlot, js_SetRequiredSlot
};
JSClass js_ObjectClass = {
js_Object_str,
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,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, JSACC_PROTO|JSACC_WRITE, vp, &attrs))
return JS_FALSE;
return js_SetProtoOrParent(cx, obj, slot, pobj);
}
static JSBool
obj_getCount(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
jsval iter_state;
jsid num_properties;
JSBool ok;
if (JS_HAS_STRICT_OPTION(cx) && !ReportStrictSlot(cx, JSSLOT_COUNT))
return JS_FALSE;
/* Get the number of properties to enumerate. */
iter_state = JSVAL_NULL;
ok = OBJ_ENUMERATE(cx, obj, JSENUMERATE_INIT, &iter_state, &num_properties);
if (!ok)
goto out;
if (!JSVAL_IS_INT(num_properties)) {
JS_ASSERT(0);
*vp = JSVAL_ZERO;
goto out;
}
*vp = num_properties;
out:
if (iter_state != JSVAL_NULL)
ok = OBJ_ENUMERATE(cx, obj, JSENUMERATE_DESTROY, &iter_state, 0);
return ok;
}
#else /* !JS_HAS_OBJ_PROTO_PROP */
#define object_props NULL
#endif /* !JS_HAS_OBJ_PROTO_PROP */
JSBool
js_SetProtoOrParent(JSContext *cx, JSObject *obj, uint32 slot, JSObject *pobj)
{
JSRuntime *rt;
JSObject *obj2, *oldproto;
JSScope *scope, *newscope;
/*
* Serialize all proto and parent setting in order to detect cycles.
* We nest locks in this function, and only here, in the following orders:
*
* (1) rt->setSlotLock < pobj's scope lock;
* rt->setSlotLock < pobj's proto-or-parent's scope lock;
* rt->setSlotLock < pobj's grand-proto-or-parent's scope lock;
* etc...
* (2) rt->setSlotLock < obj's scope lock < pobj's scope lock.
*
* We avoid AB-BA deadlock by restricting obj from being on pobj's parent
* or proto chain (pobj may already be on obj's parent or proto chain; it
* could be moving up or down). We finally order obj with respect to pobj
* at the bottom of this routine (just before releasing rt->setSlotLock),
* by making pobj be obj's prototype or parent.
*
* After we have set the slot and released rt->setSlotLock, another call
* to js_SetProtoOrParent could nest locks according to the first order
* list above, but it cannot deadlock with any other thread. For there
* to be a deadlock, other parts of the engine would have to nest scope
* locks in the opposite order. XXXbe ensure they don't!
*/
rt = cx->runtime;
#ifdef JS_THREADSAFE
JS_ACQUIRE_LOCK(rt->setSlotLock);
while (rt->setSlotBusy) {
jsrefcount saveDepth;
/* Take pains to avoid nesting rt->gcLock inside rt->setSlotLock! */
JS_RELEASE_LOCK(rt->setSlotLock);
saveDepth = JS_SuspendRequest(cx);
JS_ACQUIRE_LOCK(rt->setSlotLock);
if (rt->setSlotBusy)
JS_WAIT_CONDVAR(rt->setSlotDone, JS_NO_TIMEOUT);
JS_RELEASE_LOCK(rt->setSlotLock);
JS_ResumeRequest(cx, saveDepth);
JS_ACQUIRE_LOCK(rt->setSlotLock);
}
rt->setSlotBusy = JS_TRUE;
JS_RELEASE_LOCK(rt->setSlotLock);
#define SET_SLOT_DONE(rt) \
JS_BEGIN_MACRO \
JS_ACQUIRE_LOCK((rt)->setSlotLock); \
(rt)->setSlotBusy = JS_FALSE; \
JS_NOTIFY_ALL_CONDVAR((rt)->setSlotDone); \
JS_RELEASE_LOCK((rt)->setSlotLock); \
JS_END_MACRO
#else
#define SET_SLOT_DONE(rt) /* nothing */
#endif
obj2 = pobj;
while (obj2) {
if (obj2 == obj) {
SET_SLOT_DONE(rt);
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_CYCLIC_VALUE,
#if JS_HAS_OBJ_PROTO_PROP
object_props[slot].name
#else
(slot == JSSLOT_PROTO) ? js_proto_str
: js_parent_str
#endif
);
return JS_FALSE;
}
obj2 = JSVAL_TO_OBJECT(OBJ_GET_SLOT(cx, obj2, slot));
}
if (slot == JSSLOT_PROTO && OBJ_IS_NATIVE(obj)) {
/* Check to see whether obj shares its prototype's scope. */
JS_LOCK_OBJ(cx, obj);
scope = OBJ_SCOPE(obj);
oldproto = JSVAL_TO_OBJECT(LOCKED_OBJ_GET_SLOT(obj, JSSLOT_PROTO));
if (oldproto && OBJ_SCOPE(oldproto) == scope) {
/* Either obj needs a new empty scope, or it should share pobj's. */
if (!pobj ||
!OBJ_IS_NATIVE(pobj) ||
OBJ_GET_CLASS(cx, pobj) != LOCKED_OBJ_GET_CLASS(oldproto)) {
/*
* With no proto and no scope of its own, obj is truly empty.
*
* If pobj is not native, obj needs its own empty scope -- it
* should not continue to share oldproto's scope once oldproto
* is not on obj's prototype chain. That would put properties
* from oldproto's scope ahead of properties defined by pobj,
* in lookup order.
*
* If pobj's class differs from oldproto's, we may need a new
* scope to handle differences in private and reserved slots,
* so we suboptimally but safely make one.
*/
scope = js_GetMutableScope(cx, obj);
if (!scope) {
JS_UNLOCK_OBJ(cx, obj);
SET_SLOT_DONE(rt);
return JS_FALSE;
}
} else if (OBJ_SCOPE(pobj) != scope) {
#ifdef JS_THREADSAFE
/*
* We are about to nest scope locks. Help jslock.c:ShareScope
* keep scope->u.count balanced for the JS_UNLOCK_SCOPE, while
* avoiding deadlock, by recording scope in rt->setSlotScope.
*/
if (scope->ownercx) {
JS_ASSERT(scope->ownercx == cx);
rt->setSlotScope = scope;
}
#endif
/* We can't deadlock because we checked for cycles above (2). */
JS_LOCK_OBJ(cx, pobj);
newscope = (JSScope *) js_HoldObjectMap(cx, pobj->map);
obj->map = &newscope->map;
js_DropObjectMap(cx, &scope->map, obj);
JS_TRANSFER_SCOPE_LOCK(cx, scope, newscope);
scope = newscope;
#ifdef JS_THREADSAFE
rt->setSlotScope = NULL;
#endif
}
}
LOCKED_OBJ_SET_SLOT(obj, JSSLOT_PROTO, OBJECT_TO_JSVAL(pobj));
JS_UNLOCK_SCOPE(cx, scope);
} else {
OBJ_SET_SLOT(cx, obj, slot, OBJECT_TO_JSVAL(pobj));
}
SET_SLOT_DONE(rt);
return JS_TRUE;
#undef SET_SLOT_DONE
}
JS_STATIC_DLL_CALLBACK(JSHashNumber)
js_hash_object(const void *key)
{
return (JSHashNumber)JS_PTR_TO_UINT32(key) >> JSVAL_TAGBITS;
}
static JSHashEntry *
MarkSharpObjects(JSContext *cx, JSObject *obj, JSIdArray **idap)
{
JSSharpObjectMap *map;
JSHashTable *table;
JSHashNumber hash;
JSHashEntry **hep, *he;
jsatomid sharpid;
JSIdArray *ida;
JSBool ok;
jsint i, length;
jsid id;
#if JS_HAS_GETTER_SETTER
JSObject *obj2;
JSProperty *prop;
#endif
int stackDummy;
if (!JS_CHECK_STACK_SIZE(cx, stackDummy)) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_OVER_RECURSED);
return NULL;
}
map = &cx->sharpObjectMap;
table = map->table;
hash = js_hash_object(obj);
hep = JS_HashTableRawLookup(table, hash, obj);
he = *hep;
if (!he) {
sharpid = 0;
he = JS_HashTableRawAdd(table, hep, hash, obj,
JS_UINT32_TO_PTR(sharpid));
if (!he) {
JS_ReportOutOfMemory(cx);
return NULL;
}
/*
* Increment map->depth to protect js_EnterSharpObject from reentering
* itself badly. Without this fix, if we reenter the basis case where
* map->depth == 0, when unwinding the inner call we will destroy the
* newly-created hash table and crash.
*/
++map->depth;
ida = JS_Enumerate(cx, obj);
--map->depth;
if (!ida)
return NULL;
ok = JS_TRUE;
for (i = 0, length = ida->length; i < length; i++) {
JSTempValueRooter v;
JSTempValueRooter setter;
PRBool hasGetter, hasSetter;
id = ida->vector[i];
JS_PUSH_SINGLE_TEMP_ROOT(cx, JSVAL_VOID, &v);
#if JS_HAS_GETTER_SETTER
ok = OBJ_LOOKUP_PROPERTY(cx, obj, id, &obj2, &prop);
if (!ok)
goto brk;
if (!prop)
goto cont;
JS_PUSH_SINGLE_TEMP_ROOT(cx, JSVAL_VOID, &setter);
if (!OBJ_IS_NATIVE(obj2)) {
OBJ_DROP_PROPERTY(cx, obj2, prop);
hasGetter = hasSetter = PR_FALSE;
} else {
JSScopeProperty *sprop = (JSScopeProperty *) prop;
uintN attrs = sprop->attrs;
hasGetter = (attrs & JSPROP_GETTER);
hasSetter = (attrs & JSPROP_SETTER);
if (hasGetter)
v.u.value = (jsval) ((JSScopeProperty*)sprop)->getter;
if (hasSetter)
setter.u.value = (jsval) ((JSScopeProperty*)sprop)->setter;
JS_UNLOCK_OBJ(cx, obj2);
}
if (hasSetter) {
/* Mark the getter, then set value to setter. */
if (hasGetter && !JSVAL_IS_PRIMITIVE(v.u.value)) {
ok = !!MarkSharpObjects(cx, JSVAL_TO_OBJECT(v.u.value), NULL);
}
if (ok)
v.u.value = setter.u.value;
} else if (!hasGetter) {
ok = OBJ_GET_PROPERTY(cx, obj, id, &(v.u.value));
}
JS_POP_TEMP_ROOT(cx, &setter);
#else
ok = OBJ_GET_PROPERTY(cx, obj, id, &(v.u.value));
#endif
if (!ok)
goto brk;
if (!JSVAL_IS_PRIMITIVE(v.u.value) &&
!MarkSharpObjects(cx, JSVAL_TO_OBJECT(v.u.value), NULL)) {
ok = JS_FALSE;
goto brk;
}
cont:
JS_POP_TEMP_ROOT(cx, &v);
continue;
brk:
JS_POP_TEMP_ROOT(cx, &v);
break;
}
if (!ok || !idap)
JS_DestroyIdArray(cx, ida);
if (!ok)
return NULL;
} else {
sharpid = JS_PTR_TO_UINT32(he->value);
if (sharpid == 0) {
sharpid = ++map->sharpgen << SHARP_ID_SHIFT;
he->value = JS_UINT32_TO_PTR(sharpid);
}
ida = NULL;
}
if (idap)
*idap = ida;
return he;
}
JSHashEntry *
js_EnterSharpObject(JSContext *cx, JSObject *obj, JSIdArray **idap,
jschar **sp)
{
JSSharpObjectMap *map;
JSHashTable *table;
JSIdArray *ida;
JSHashNumber hash;
JSHashEntry *he, **hep;
jsatomid sharpid;
char buf[20];
size_t len;
if (JS_HAS_NATIVE_BRANCH_CALLBACK_OPTION(cx) &&
cx->branchCallback &&
!cx->branchCallback(cx, NULL)) {
return NULL;
}
/* Set to null in case we return an early error. */
*sp = NULL;
map = &cx->sharpObjectMap;
table = map->table;
if (!table) {
table = JS_NewHashTable(8, js_hash_object, JS_CompareValues,
JS_CompareValues, NULL, NULL);
if (!table) {
JS_ReportOutOfMemory(cx);
return NULL;
}
map->table = table;
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)
{
GC_MARK((JSContext *)arg, (JSObject *)he->key, "sharp table entry");
return JS_DHASH_NEXT;
}
void
js_GCMarkSharpMap(JSContext *cx, 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, cx);
}
#define OBJ_TOSTRING_EXTRA 4 /* for 4 local GC roots */
#if JS_HAS_TOSOURCE
JSBool
js_obj_toSource(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
JSBool ok, outermost;
JSHashEntry *he;
JSIdArray *ida;
jschar *chars, *ochars, *vsharp;
const jschar *idstrchars, *vchars;
size_t nchars, idstrlength, gsoplength, vlength, vsharplength, curlen;
char *comma;
jsint i, j, length, valcnt;
jsid id;
#if JS_HAS_GETTER_SETTER
JSObject *obj2;
JSProperty *prop;
uintN attrs;
#endif
jsval *val;
JSString *gsopold[2];
JSString *gsop[2];
JSAtom *atom;
JSString *idstr, *valstr, *str;
int stackDummy;
if (!JS_CHECK_STACK_SIZE(cx, stackDummy)) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_OVER_RECURSED);
return JS_FALSE;
}
/* If outermost, we need parentheses to be an expression, not a block. */
outermost = (cx->sharpObjectMap.depth == 0);
he = js_EnterSharpObject(cx, obj, &ida, &chars);
if (!he)
return JS_FALSE;
if (IS_SHARP(he)) {
/*
* We didn't enter -- obj is already "sharp", meaning we've visited it
* already in our depth first search, and therefore chars contains a
* string of the form "#n#".
*/
JS_ASSERT(!ida);
#if JS_HAS_SHARP_VARS
nchars = js_strlen(chars);
#else
chars[0] = '{';
chars[1] = '}';
chars[2] = 0;
nchars = 2;
#endif
goto make_string;
}
JS_ASSERT(ida);
ok = JS_TRUE;
if (!chars) {
/* If outermost, allocate 4 + 1 for "({})" and the terminator. */
chars = (jschar *) malloc(((outermost ? 4 : 2) + 1) * sizeof(jschar));
nchars = 0;
if (!chars)
goto error;
if (outermost)
chars[nchars++] = '(';
} else {
/* js_EnterSharpObject returned a string of the form "#n=" in chars. */
MAKE_SHARP(he);
nchars = js_strlen(chars);
chars = (jschar *)
realloc((ochars = chars), (nchars + 2 + 1) * sizeof(jschar));
if (!chars) {
free(ochars);
goto error;
}
if (outermost) {
/*
* No need for parentheses around the whole shebang, because #n=
* unambiguously begins an object initializer, and never a block
* statement.
*/
outermost = JS_FALSE;
}
}
#ifdef DUMP_CALL_TABLE
if (cx->options & JSOPTION_LOGCALL_TOSOURCE) {
const char *classname = OBJ_GET_CLASS(cx, obj)->name;
size_t classnchars = strlen(classname);
static const char classpropid[] = "C";
const char *cp;
size_t onchars = nchars;
/* 2 for ': ', 2 quotes around classname, 2 for ', ' after. */
classnchars += sizeof classpropid - 1 + 2 + 2;
if (ida->length)
classnchars += 2;
/* 2 for the braces, 1 for the terminator */
chars = (jschar *)
realloc((ochars = chars),
(nchars + classnchars + 2 + 1) * sizeof(jschar));
if (!chars) {
free(ochars);
goto error;
}
chars[nchars++] = '{'; /* 1 from the 2 braces */
for (cp = classpropid; *cp; cp++)
chars[nchars++] = (jschar) *cp;
chars[nchars++] = ':';
chars[nchars++] = ' '; /* 2 for ': ' */
chars[nchars++] = '"';
for (cp = classname; *cp; cp++)
chars[nchars++] = (jschar) *cp;
chars[nchars++] = '"'; /* 2 quotes */
if (ida->length) {
chars[nchars++] = ',';
chars[nchars++] = ' '; /* 2 for ', ' */
}
JS_ASSERT(nchars - onchars == 1 + classnchars);
} else
#endif
chars[nchars++] = '{';
comma = NULL;
/*
* We have four local roots for cooked and raw value GC safety. Hoist the
* "argv + 2" out of the loop using the val local, which refers to the raw
* (unconverted, "uncooked") values.
*/
val = argv + 2;
for (i = 0, length = ida->length; i < length; i++) {
JSBool idIsLexicalIdentifier, needOldStyleGetterSetter;
/* Get strings for id and value and GC-root them via argv. */
id = ida->vector[i];
#if JS_HAS_GETTER_SETTER
ok = OBJ_LOOKUP_PROPERTY(cx, obj, id, &obj2, &prop);
if (!ok)
goto error;
#endif
/*
* Convert id to a jsval and then to a string. Decide early whether we
* prefer get/set or old getter/setter syntax.
*/
atom = JSID_IS_ATOM(id) ? JSID_TO_ATOM(id) : NULL;
idstr = js_ValueToString(cx, ID_TO_VALUE(id));
if (!idstr) {
ok = JS_FALSE;
OBJ_DROP_PROPERTY(cx, obj2, prop);
goto error;
}
*rval = 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) {
if (OBJ_IS_NATIVE(obj2)) {
JSScopeProperty *sprop = (JSScopeProperty *) prop;
attrs = sprop->attrs;
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++;
}
JS_UNLOCK_OBJ(cx, obj2);
} else {
OBJ_DROP_PROPERTY(cx, obj2, prop);
}
if (!valcnt) {
valcnt = 1;
gsop[0] = NULL;
gsopold[0] = NULL;
ok = OBJ_GET_PROPERTY(cx, obj, id, &val[0]);
if (!ok)
goto error;
}
}
#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]);
if (!ok)
goto error;
#endif /* !JS_HAS_GETTER_SETTER */
/*
* If id is a string that's not an identifier, then it needs to be
* quoted. Also, negative integer ids must be quoted.
*/
if (atom
? !idIsLexicalIdentifier
: (JSID_IS_OBJECT(id) || JSID_TO_INT(id) < 0)) {
idstr = js_QuoteString(cx, idstr, (jschar)'\'');
if (!idstr) {
ok = JS_FALSE;
goto error;
}
*rval = STRING_TO_JSVAL(idstr); /* local root */
}
idstrchars = JSSTRING_CHARS(idstr);
idstrlength = JSSTRING_LENGTH(idstr);
for (j = 0; j < valcnt; j++) {
/* Convert val[j] to its canonical source form. */
valstr = js_ValueToSource(cx, val[j]);
if (!valstr) {
ok = JS_FALSE;
goto error;
}
argv[j] = STRING_TO_JSVAL(valstr); /* local root */
vchars = JSSTRING_CHARS(valstr);
vlength = JSSTRING_LENGTH(valstr);
if (vchars[0] == '#')
needOldStyleGetterSetter = JS_TRUE;
if (needOldStyleGetterSetter)
gsop[j] = gsopold[j];
#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) {
const jschar *start = vchars;
if (vchars[0] == '(')
vchars++;
vchars = js_strchr_limit(vchars, '(', vchars + vlength);
if (vchars) {
vlength -= vchars - start + 1;
} else {
gsop[j] = NULL;
vchars = start;
}
}
#else
needOldStyleGetterSetter = JS_TRUE;
gsop[j] = gsopold[j];
#endif
/* If val[j] is a non-sharp object, consider sharpening it. */
vsharp = NULL;
vsharplength = 0;
#if JS_HAS_SHARP_VARS
if (!JSVAL_IS_PRIMITIVE(val[j]) && vchars[0] != '#') {
he = js_EnterSharpObject(cx, JSVAL_TO_OBJECT(val[j]), NULL,
&vsharp);
if (!he) {
ok = JS_FALSE;
goto error;
}
if (IS_SHARP(he)) {
vchars = vsharp;
vlength = js_strlen(vchars);
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
#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);
#ifdef DUMP_CALL_TABLE
if (outermost && nchars >= js_LogCallToSourceLimit)
break;
#endif
}
}
chars[nchars++] = '}';
if (outermost)
chars[nchars++] = ')';
chars[nchars] = 0;
error:
js_LeaveSharpObject(cx, &ida);
if (!ok) {
if (chars)
free(chars);
return ok;
}
if (!chars) {
JS_ReportOutOfMemory(cx);
return JS_FALSE;
}
make_string:
str = js_NewString(cx, chars, nchars, 0);
if (!str) {
free(chars);
return JS_FALSE;
}
*rval = STRING_TO_JSVAL(str);
return JS_TRUE;
overflow:
JS_free(cx, vsharp);
free(chars);
chars = NULL;
goto error;
}
#endif /* JS_HAS_TOSOURCE */
JSBool
js_obj_toString(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
jschar *chars;
size_t nchars;
const char *clazz, *prefix;
JSString *str;
clazz = OBJ_GET_CLASS(cx, obj)->name;
nchars = 9 + strlen(clazz); /* 9 for "[object ]" */
chars = (jschar *) JS_malloc(cx, (nchars + 1) * sizeof(jschar));
if (!chars)
return JS_FALSE;
prefix = "[object ";
nchars = 0;
while ((chars[nchars] = (jschar)*prefix) != 0)
nchars++, prefix++;
while ((chars[nchars] = (jschar)*clazz) != 0)
nchars++, clazz++;
chars[nchars++] = ']';
chars[nchars] = 0;
str = js_NewString(cx, chars, nchars, 0);
if (!str) {
JS_free(cx, chars);
return JS_FALSE;
}
*rval = STRING_TO_JSVAL(str);
return JS_TRUE;
}
static JSBool
js_obj_toLocaleString(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
JSString *str;
str = js_ValueToString(cx, argv[-1]);
if (!str)
return JS_FALSE;
*rval = STRING_TO_JSVAL(str);
return JS_TRUE;
}
static JSBool
obj_valueOf(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
*rval = OBJECT_TO_JSVAL(obj);
return JS_TRUE;
}
/*
* Check whether principals subsumes scopeobj's principals, and return true
* if so (or if scopeobj has no principals, for backward compatibility with
* the JS API, which does not require principals), and false otherwise.
*/
JSBool
js_CheckPrincipalsAccess(JSContext *cx, JSObject *scopeobj,
JSPrincipals *principals, 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;
JS_ASSERT(principals || !cx->runtime->findObjectPrincipals);
flags = JS_GetScriptFilenameFlags(caller->script);
if ((flags & JSFILENAME_SYSTEM) &&
principals &&
strcmp(principals->codebase, "[System Principal]")) {
*linenop = 0;
return principals->codebase;
}
*linenop = js_PCToLineNumber(cx, caller->script, caller->pc);
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);
JS_ASSERT(!caller || caller->pc);
indirectCall = (caller && *caller->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 (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;
#if JS_HAS_SCRIPT_OBJECT
/*
* Script.prototype.compile/exec and Object.prototype.eval all take an
* optional trailing argument that overrides the scope object.
*/
scopeobj = NULL;
if (argc >= 2) {
if (!js_ValueToObject(cx, argv[1], &scopeobj))
return JS_FALSE;
argv[1] = OBJECT_TO_JSVAL(scopeobj);
}
if (!scopeobj)
#endif
{
#if JS_HAS_EVAL_THIS_SCOPE
/* If obj.eval(str), emulate 'with (obj) eval(str)' in the caller. */
if (indirectCall) {
callerScopeChain = js_GetScopeChain(cx, caller);
if (!callerScopeChain)
return JS_FALSE;
OBJ_TO_INNER_OBJECT(cx, obj);
if (!obj)
return JS_FALSE;
if (obj != callerScopeChain) {
if (!js_CheckPrincipalsAccess(cx, obj,
caller->script->principals,
cx->runtime->atomState.evalAtom))
{
return JS_FALSE;
}
scopeobj = js_NewWithObject(cx, obj, callerScopeChain, -1);
if (!scopeobj)
return JS_FALSE;
/* 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;
}
}
/* From here on, control must exit through label out with ok set. */
#endif
/* Compile using caller's current scope object. */
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_CompileUCScriptForPrincipals(cx, scopeobj, principals,
JSSTRING_CHARS(str),
JSSTRING_LENGTH(str),
file, line);
if (!script) {
ok = JS_FALSE;
goto out;
}
#if JS_HAS_SCRIPT_OBJECT
if (argc < 2)
#endif
{
/* Execute using caller's new scope object (might be a Call object). */
if (caller)
scopeobj = caller->scopeChain;
}
/*
* 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
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, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
JSObject *callable;
jsval userid, value;
jsid propid;
uintN attrs;
callable = js_ValueToCallableObject(cx, &argv[1], 0);
if (!callable)
return JS_FALSE;
/* Compute the unique int/atom symbol id needed by js_LookupProperty. */
userid = argv[0];
if (!JS_ValueToId(cx, userid, &propid))
return JS_FALSE;
if (!OBJ_CHECK_ACCESS(cx, obj, propid, JSACC_WATCH, &value, &attrs))
return JS_FALSE;
if (attrs & JSPROP_READONLY)
return JS_TRUE;
return JS_SetWatchPoint(cx, obj, userid, obj_watch_handler, callable);
}
static JSBool
obj_unwatch(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
return JS_ClearWatchPoint(cx, obj, argv[0], NULL, NULL);
}
#endif /* JS_HAS_OBJ_WATCHPOINT */
/*
* Prototype and property query methods, to complement the 'in' and
* 'instanceof' operators.
*/
/* Proposed ECMA 15.2.4.5. */
static JSBool
obj_hasOwnProperty(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
return js_HasOwnPropertyHelper(cx, obj, obj->map->ops->lookupProperty,
argc, argv, rval);
}
JSBool
js_HasOwnPropertyHelper(JSContext *cx, JSObject *obj, JSLookupPropOp lookup,
uintN argc, jsval *argv, jsval *rval)
{
jsid id;
JSObject *obj2;
JSProperty *prop;
JSScopeProperty *sprop;
if (!JS_ValueToId(cx, argv[0], &id))
return JS_FALSE;
if (!lookup(cx, obj, id, &obj2, &prop))
return JS_FALSE;
if (!prop) {
*rval = JSVAL_FALSE;
} else if (obj2 == obj) {
*rval = JSVAL_TRUE;
} else {
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) {
*rval = 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;
*rval = BOOLEAN_TO_JSVAL(SPROP_IS_SHARED_PERMANENT(sprop));
} else {
*rval = JSVAL_FALSE;
}
}
if (prop)
OBJ_DROP_PROPERTY(cx, obj2, prop);
return JS_TRUE;
}
/* Proposed ECMA 15.2.4.6. */
static JSBool
obj_isPrototypeOf(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
JSBool b;
if (!js_IsDelegate(cx, obj, *argv, &b))
return JS_FALSE;
*rval = BOOLEAN_TO_JSVAL(b);
return JS_TRUE;
}
/* Proposed ECMA 15.2.4.7. */
static JSBool
obj_propertyIsEnumerable(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
jsid id;
uintN attrs;
JSObject *obj2;
JSProperty *prop;
JSBool ok;
if (!JS_ValueToId(cx, argv[0], &id))
return JS_FALSE;
if (!OBJ_LOOKUP_PROPERTY(cx, obj, id, &obj2, &prop))
return JS_FALSE;
if (!prop) {
*rval = JSVAL_FALSE;
return JS_TRUE;
}
/*
* XXX ECMA spec error compatible: return false unless hasOwnProperty.
* The ECMA spec really should be fixed so propertyIsEnumerable and the
* for..in loop agree on whether prototype properties are enumerable,
* obviously by fixing this method (not by breaking the for..in loop!).
*
* We check here for shared permanent prototype properties, which should
* be treated as if they are local to obj. They are an implementation
* technique used to satisfy ECMA requirements; users should not be able
* to distinguish a shared permanent proto-property from a local one.
*/
if (obj2 != obj &&
!(OBJ_IS_NATIVE(obj2) &&
SPROP_IS_SHARED_PERMANENT((JSScopeProperty *)prop))) {
OBJ_DROP_PROPERTY(cx, obj2, prop);
*rval = JSVAL_FALSE;
return JS_TRUE;
}
ok = OBJ_GET_ATTRIBUTES(cx, obj2, id, prop, &attrs);
OBJ_DROP_PROPERTY(cx, obj2, prop);
if (ok)
*rval = BOOLEAN_TO_JSVAL((attrs & JSPROP_ENUMERATE) != 0);
return ok;
}
#if JS_HAS_GETTER_SETTER
static JSBool
obj_defineGetter(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
jsval fval, junk;
jsid id;
uintN attrs;
fval = argv[1];
if (JS_TypeOfValue(cx, fval) != JSTYPE_FUNCTION) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_BAD_GETTER_OR_SETTER,
js_getter_str);
return JS_FALSE;
}
if (!JS_ValueToId(cx, argv[0], &id))
return JS_FALSE;
if (!js_CheckRedeclaration(cx, obj, id, JSPROP_GETTER, NULL, NULL))
return JS_FALSE;
/*
* Getters and setters are just like watchpoints from an access
* control point of view.
*/
if (!OBJ_CHECK_ACCESS(cx, obj, id, JSACC_WATCH, &junk, &attrs))
return JS_FALSE;
return OBJ_DEFINE_PROPERTY(cx, obj, id, JSVAL_VOID,
(JSPropertyOp) JSVAL_TO_OBJECT(fval), NULL,
JSPROP_ENUMERATE | JSPROP_GETTER | JSPROP_SHARED,
NULL);
}
static JSBool
obj_defineSetter(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
jsval fval, junk;
jsid id;
uintN attrs;
fval = argv[1];
if (JS_TypeOfValue(cx, fval) != JSTYPE_FUNCTION) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_BAD_GETTER_OR_SETTER,
js_setter_str);
return JS_FALSE;
}
if (!JS_ValueToId(cx, argv[0], &id))
return JS_FALSE;
if (!js_CheckRedeclaration(cx, obj, id, JSPROP_SETTER, NULL, NULL))
return JS_FALSE;
/*
* Getters and setters are just like watchpoints from an access
* control point of view.
*/
if (!OBJ_CHECK_ACCESS(cx, obj, id, JSACC_WATCH, &junk, &attrs))
return JS_FALSE;
return OBJ_DEFINE_PROPERTY(cx, obj, id, JSVAL_VOID,
NULL, (JSPropertyOp) JSVAL_TO_OBJECT(fval),
JSPROP_ENUMERATE | JSPROP_SETTER | JSPROP_SHARED,
NULL);
}
static JSBool
obj_lookupGetter(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
jsid id;
JSObject *pobj;
JSProperty *prop;
JSScopeProperty *sprop;
if (!JS_ValueToId(cx, argv[0], &id))
return JS_FALSE;
if (!OBJ_LOOKUP_PROPERTY(cx, obj, id, &pobj, &prop))
return JS_FALSE;
if (prop) {
if (OBJ_IS_NATIVE(pobj)) {
sprop = (JSScopeProperty *) prop;
if (sprop->attrs & JSPROP_GETTER)
*rval = OBJECT_TO_JSVAL(sprop->getter);
}
OBJ_DROP_PROPERTY(cx, pobj, prop);
}
return JS_TRUE;
}
static JSBool
obj_lookupSetter(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
jsid id;
JSObject *pobj;
JSProperty *prop;
JSScopeProperty *sprop;
if (!JS_ValueToId(cx, argv[0], &id))
return JS_FALSE;
if (!OBJ_LOOKUP_PROPERTY(cx, obj, id, &pobj, &prop))
return JS_FALSE;
if (prop) {
if (OBJ_IS_NATIVE(pobj)) {
sprop = (JSScopeProperty *) prop;
if (sprop->attrs & JSPROP_SETTER)
*rval = OBJECT_TO_JSVAL(sprop->setter);
}
OBJ_DROP_PROPERTY(cx, pobj, prop);
}
return JS_TRUE;
}
#endif /* JS_HAS_GETTER_SETTER */
#if JS_HAS_OBJ_WATCHPOINT
const char js_watch_str[] = "watch";
const char js_unwatch_str[] = "unwatch";
#endif
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_toSource_str, js_obj_toSource, 0, 0, OBJ_TOSTRING_EXTRA},
#endif
{js_toString_str, js_obj_toString, 0, 0, OBJ_TOSTRING_EXTRA},
{js_toLocaleString_str, js_obj_toLocaleString, 0, 0, OBJ_TOSTRING_EXTRA},
{js_valueOf_str, obj_valueOf, 0,0,0},
#if JS_HAS_OBJ_WATCHPOINT
{js_watch_str, obj_watch, 2,0,0},
{js_unwatch_str, obj_unwatch, 1,0,0},
#endif
{js_hasOwnProperty_str, obj_hasOwnProperty, 1,0,0},
{js_isPrototypeOf_str, obj_isPrototypeOf, 1,0,0},
{js_propertyIsEnumerable_str, obj_propertyIsEnumerable, 1,0,0},
#if JS_HAS_GETTER_SETTER
{js_defineGetter_str, obj_defineGetter, 2,0,0},
{js_defineSetter_str, obj_defineSetter, 2,0,0},
{js_lookupGetter_str, obj_lookupGetter, 1,0,0},
{js_lookupSetter_str, obj_lookupSetter, 1,0,0},
#endif
{0,0,0,0,0}
};
static JSBool
Object(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
if (argc == 0) {
/* Trigger logic below to construct a blank object. */
obj = NULL;
} else {
/* If argv[0] is null or undefined, obj comes back null. */
if (!js_ValueToObject(cx, argv[0], &obj))
return JS_FALSE;
}
if (!obj) {
JS_ASSERT(!argc || JSVAL_IS_NULL(argv[0]) || JSVAL_IS_VOID(argv[0]));
if (cx->fp->flags & JSFRAME_CONSTRUCTING)
return JS_TRUE;
obj = js_NewObject(cx, &js_ObjectClass, NULL, NULL);
if (!obj)
return JS_FALSE;
}
*rval = OBJECT_TO_JSVAL(obj);
return JS_TRUE;
}
/*
* ObjectOps and Class for with-statement stack objects.
*/
static JSBool
with_LookupProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
JSProperty **propp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_LookupProperty(cx, obj, id, objp, propp);
return OBJ_LOOKUP_PROPERTY(cx, proto, id, objp, propp);
}
static JSBool
with_GetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_GetProperty(cx, obj, id, vp);
return OBJ_GET_PROPERTY(cx, proto, id, vp);
}
static JSBool
with_SetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_SetProperty(cx, obj, id, vp);
return OBJ_SET_PROPERTY(cx, proto, id, vp);
}
static JSBool
with_GetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop,
uintN *attrsp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_GetAttributes(cx, obj, id, prop, attrsp);
return OBJ_GET_ATTRIBUTES(cx, proto, id, prop, attrsp);
}
static JSBool
with_SetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop,
uintN *attrsp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_SetAttributes(cx, obj, id, prop, attrsp);
return OBJ_SET_ATTRIBUTES(cx, proto, id, prop, attrsp);
}
static JSBool
with_DeleteProperty(JSContext *cx, JSObject *obj, jsid id, jsval *rval)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_DeleteProperty(cx, obj, id, rval);
return OBJ_DELETE_PROPERTY(cx, proto, id, rval);
}
static JSBool
with_DefaultValue(JSContext *cx, JSObject *obj, JSType hint, jsval *vp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_DefaultValue(cx, obj, hint, vp);
return OBJ_DEFAULT_VALUE(cx, proto, hint, vp);
}
static JSBool
with_Enumerate(JSContext *cx, JSObject *obj, JSIterateOp enum_op,
jsval *statep, jsid *idp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_Enumerate(cx, obj, enum_op, statep, idp);
return OBJ_ENUMERATE(cx, proto, enum_op, statep, idp);
}
static JSBool
with_CheckAccess(JSContext *cx, JSObject *obj, jsid id, JSAccessMode mode,
jsval *vp, uintN *attrsp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_CheckAccess(cx, obj, id, mode, vp, attrsp);
return OBJ_CHECK_ACCESS(cx, proto, id, mode, vp, attrsp);
}
static JSObject *
with_ThisObject(JSContext *cx, JSObject *obj)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return obj;
return OBJ_THIS_OBJECT(cx, proto);
}
JS_FRIEND_DATA(JSObjectOps) js_WithObjectOps = {
js_NewObjectMap, js_DestroyObjectMap,
with_LookupProperty, js_DefineProperty,
with_GetProperty, with_SetProperty,
with_GetAttributes, with_SetAttributes,
with_DeleteProperty, with_DefaultValue,
with_Enumerate, with_CheckAccess,
with_ThisObject, NATIVE_DROP_PROPERTY,
NULL, NULL,
NULL, NULL,
js_SetProtoOrParent, js_SetProtoOrParent,
js_Mark, js_Clear,
NULL, NULL
};
static JSObjectOps *
with_getObjectOps(JSContext *cx, JSClass *clasp)
{
return &js_WithObjectOps;
}
JSClass js_WithClass = {
"With",
JSCLASS_HAS_PRIVATE | 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);
if (!obj)
return NULL;
obj->slots[JSSLOT_PRIVATE] = PRIVATE_TO_JSVAL(cx->fp);
OBJ_SET_BLOCK_DEPTH(cx, obj, depth);
return obj;
}
JSObject *
js_NewBlockObject(JSContext *cx)
{
JSObject *obj;
/*
* 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);
if (!obj || !js_GetMutableScope(cx, obj))
return NULL;
OBJ_SET_PROTO(cx, obj, NULL);
return obj;
}
JSObject *
js_CloneBlockObject(JSContext *cx, JSObject *proto, JSObject *parent,
JSStackFrame *fp)
{
JSObject *clone;
clone = js_NewObject(cx, &js_BlockClass, proto, parent);
if (!clone)
return NULL;
clone->slots[JSSLOT_PRIVATE] = PRIVATE_TO_JSVAL(fp);
clone->slots[JSSLOT_BLOCK_DEPTH] =
OBJ_GET_SLOT(cx, proto, JSSLOT_BLOCK_DEPTH);
return clone;
}
/*
* XXXblock this reverses a path in the property tree -- try to share
* the prototype's scope harder!
*/
JSBool
js_PutBlockObject(JSContext *cx, JSObject *obj)
{
JSStackFrame *fp;
uintN depth, slot;
JSScopeProperty *sprop;
fp = (JSStackFrame *) JS_GetPrivate(cx, obj);
JS_ASSERT(fp);
depth = OBJ_BLOCK_DEPTH(cx, obj);
for (sprop = OBJ_SCOPE(obj)->lastProp; sprop; sprop = sprop->parent) {
if (sprop->getter != js_BlockClass.getProperty)
continue;
if (!(sprop->flags & SPROP_HAS_SHORTID))
continue;
slot = depth + (uintN)sprop->shortid;
JS_ASSERT(slot < fp->script->depth);
if (!js_DefineNativeProperty(cx, obj, sprop->id,
fp->spbase[slot], NULL, NULL,
JSPROP_ENUMERATE | JSPROP_PERMANENT,
SPROP_HAS_SHORTID, sprop->shortid,
NULL)) {
JS_SetPrivate(cx, obj, NULL);
return JS_FALSE;
}
}
return JS_SetPrivate(cx, obj, NULL);
}
static JSBool
block_getProperty(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
JSStackFrame *fp;
jsint slot;
JS_ASSERT(JS_InstanceOf(cx, obj, &js_BlockClass, NULL));
if (!JSVAL_IS_INT(id))
return JS_TRUE;
fp = (JSStackFrame *) JS_GetPrivate(cx, obj);
if (!fp)
return JS_TRUE;
slot = OBJ_BLOCK_DEPTH(cx, obj) + (uint16) JSVAL_TO_INT(id);
JS_ASSERT((uintN)slot < fp->script->depth);
*vp = fp->spbase[slot];
return JS_TRUE;
}
static JSBool
block_setProperty(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
JSStackFrame *fp;
jsint slot;
JS_ASSERT(JS_InstanceOf(cx, obj, &js_BlockClass, NULL));
if (!JSVAL_IS_INT(id))
return JS_TRUE;
fp = (JSStackFrame *) JS_GetPrivate(cx, obj);
if (!fp)
return JS_TRUE;
slot = OBJ_BLOCK_DEPTH(cx, obj) + (uint16) JSVAL_TO_INT(id);
JS_ASSERT((uintN)slot < fp->script->depth);
fp->spbase[slot] = *vp;
return JS_TRUE;
}
#if JS_HAS_XDR
#define NO_PARENT_INDEX (jsatomid)-1
jsatomid
FindObjectAtomIndex(JSAtomMap *map, JSObject *obj)
{
size_t i;
JSAtom *atom;
for (i = 0; i < map->length; i++) {
atom = map->vector[i];
if (ATOM_KEY(atom) == OBJECT_TO_JSVAL(obj))
return i;
}
return NO_PARENT_INDEX;
}
static JSBool
block_xdrObject(JSXDRState *xdr, JSObject **objp)
{
JSContext *cx;
jsatomid parentId;
JSAtomMap *atomMap;
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
atomMap = &xdr->script->atomMap;
if (xdr->mode == JSXDR_ENCODE) {
obj = *objp;
parent = OBJ_GET_PARENT(cx, obj);
parentId = FindObjectAtomIndex(atomMap, parent);
depth = OBJ_BLOCK_DEPTH(cx, obj);
count = 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
* atomMap. 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 {
atom = js_GetAtom(cx, atomMap, parentId);
JS_ASSERT(ATOM_IS_OBJECT(atom));
parent = ATOM_TO_OBJECT(atom);
}
obj->slots[JSSLOT_PARENT] = OBJECT_TO_JSVAL(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;
obj->slots[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
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, NULL
};
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_InitObjectClass(JSContext *cx, JSObject *obj)
{
JSObject *proto;
proto = JS_InitClass(cx, obj, NULL, &js_ObjectClass, Object, 1,
object_props, object_methods, NULL, NULL);
if (!proto)
return NULL;
/* 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 proto;
}
void
js_InitObjectMap(JSObjectMap *map, jsrefcount nrefs, JSObjectOps *ops,
JSClass *clasp)
{
map->nrefs = nrefs;
map->ops = ops;
map->nslots = JS_INITIAL_NSLOTS;
map->freeslot = JSSLOT_FREE(clasp);
}
JSObjectMap *
js_NewObjectMap(JSContext *cx, jsrefcount nrefs, JSObjectOps *ops,
JSClass *clasp, JSObject *obj)
{
return (JSObjectMap *) js_NewScope(cx, nrefs, ops, clasp, obj);
}
void
js_DestroyObjectMap(JSContext *cx, JSObjectMap *map)
{
js_DestroyScope(cx, (JSScope *)map);
}
JSObjectMap *
js_HoldObjectMap(JSContext *cx, JSObjectMap *map)
{
JS_ASSERT(map->nrefs >= 0);
JS_ATOMIC_INCREMENT(&map->nrefs);
return map;
}
JSObjectMap *
js_DropObjectMap(JSContext *cx, JSObjectMap *map, JSObject *obj)
{
JS_ASSERT(map->nrefs > 0);
JS_ATOMIC_DECREMENT(&map->nrefs);
if (map->nrefs == 0) {
map->ops->destroyObjectMap(cx, map);
return NULL;
}
if (MAP_IS_NATIVE(map) && ((JSScope *)map)->object == obj)
((JSScope *)map)->object = NULL;
return map;
}
static jsval *
AllocSlots(JSContext *cx, jsval *slots, uint32 nslots)
{
size_t nbytes, obytes, minbytes;
uint32 i, oslots;
jsval *newslots;
nbytes = (nslots + 1) * sizeof(jsval);
if (slots) {
oslots = slots[-1];
obytes = (oslots + 1) * sizeof(jsval);
} else {
oslots = 0;
obytes = 0;
}
if (nbytes <= GC_NBYTES_MAX) {
newslots = (jsval *) js_NewGCThing(cx, GCX_PRIVATE, nbytes);
} else {
newslots = (jsval *)
JS_realloc(cx,
(obytes <= GC_NBYTES_MAX) ? NULL : slots - 1,
nbytes);
}
if (!newslots)
return NULL;
if (obytes != 0) {
/* If either nbytes or obytes fit in a GC-thing, we must copy. */
minbytes = JS_MIN(nbytes, obytes);
if (minbytes <= GC_NBYTES_MAX)
memcpy(newslots + 1, slots, minbytes - sizeof(jsval));
/* If nbytes are in a GC-thing but obytes aren't, free obytes. */
if (nbytes <= GC_NBYTES_MAX && obytes > GC_NBYTES_MAX)
JS_free(cx, slots - 1);
/* If we're extending an allocation, initialize free slots. */
if (nslots > oslots) {
for (i = 1 + oslots; i <= nslots; i++)
newslots[i] = JSVAL_VOID;
}
}
newslots[0] = nslots;
return ++newslots;
}
static void
FreeSlots(JSContext *cx, jsval *slots)
{
size_t nbytes;
/*
* NB: We count on smaller GC-things being finalized before larger things
* that become garbage during the same GC. Without this assumption, we
* couldn't load slots[-1] here without possibly loading a gcFreeList link
* (see struct JSGCThing in jsgc.h).
*/
nbytes = (slots[-1] + 1) * sizeof(jsval);
if (nbytes > GC_NBYTES_MAX)
JS_free(cx, slots - 1);
}
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)
{
jsid id;
JSObject *obj;
JSObjectOps *ops;
JSObjectMap *map;
JSClass *protoclasp;
uint32 nslots, i;
jsval *newslots;
JSTempValueRooter tvr;
/* 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;
}
}
/* Always call the class's getObjectOps hook if it has one. */
ops = clasp->getObjectOps
? clasp->getObjectOps(cx, clasp)
: &js_ObjectOps;
/*
* Allocate a zeroed object from the GC heap. Do this *after* any other
* GC-thing allocations under js_GetClassPrototype or clasp->getObjectOps,
* to avoid displacing the newborn root for obj.
*/
obj = (JSObject *) js_NewGCThing(cx, GCX_OBJECT, sizeof(JSObject));
if (!obj)
return NULL;
/*
* Root obj to prevent it from being collected out from under this call.
* to js_NewObject. AllocSlots can trigger a finalizer from a last-ditch
* GC calling JS_ClearNewbornRoots. There's also the possibilty of things
* happening under the objectHook call-out further below.
*/
JS_PUSH_TEMP_ROOT_OBJECT(cx, obj, &tvr);
/*
* Share proto's map only if it has the same JSObjectOps, and only if
* proto's class has the same private and reserved slots as obj's map
* and class have. We assume that if prototype and object are of the
* same class, they always have the same number of computed reserved
* slots (returned via clasp->reserveSlots); otherwise, prototype and
* object classes must have the same (null or not) reserveSlots hook.
*/
if (proto &&
(map = proto->map)->ops == ops &&
((protoclasp = OBJ_GET_CLASS(cx, proto)) == clasp ||
(!((protoclasp->flags ^ clasp->flags) &
(JSCLASS_HAS_PRIVATE |
(JSCLASS_RESERVED_SLOTS_MASK << JSCLASS_RESERVED_SLOTS_SHIFT))) &&
protoclasp->reserveSlots == clasp->reserveSlots)))
{
/*
* Default parent to the parent of the prototype, which was set from
* the parent of the prototype's constructor.
*/
if (!parent)
parent = OBJ_GET_PARENT(cx, proto);
/* Share the given prototype's map. */
obj->map = js_HoldObjectMap(cx, map);
/* Ensure that obj starts with the minimum slots for clasp. */
nslots = JS_INITIAL_NSLOTS;
} else {
/* Leave parent alone. Allocate a new map for obj. */
map = ops->newObjectMap(cx, 1, ops, clasp, obj);
if (!map)
goto bad;
obj->map = map;
/* Let ops->newObjectMap set nslots so as to reserve slots. */
nslots = map->nslots;
}
/* Allocate a slots vector, with a -1'st element telling its length. */
newslots = AllocSlots(cx, NULL, nslots);
if (!newslots) {
js_DropObjectMap(cx, obj->map, obj);
obj->map = NULL;
goto bad;
}
/* Set the proto, parent, and class properties. */
newslots[JSSLOT_PROTO] = OBJECT_TO_JSVAL(proto);
newslots[JSSLOT_PARENT] = OBJECT_TO_JSVAL(parent);
newslots[JSSLOT_CLASS] = PRIVATE_TO_JSVAL(clasp);
/* Clear above JSSLOT_CLASS so the GC doesn't load uninitialized memory. */
for (i = JSSLOT_CLASS + 1; i < nslots; i++)
newslots[i] = JSVAL_VOID;
/* Store newslots after initializing all of 'em, just in case. */
obj->slots = newslots;
if (cx->runtime->objectHook) {
JS_KEEP_ATOMS(cx->runtime);
cx->runtime->objectHook(cx, obj, JS_TRUE, cx->runtime->objectHookData);
JS_UNKEEP_ATOMS(cx->runtime);
}
out:
JS_POP_TEMP_ROOT(cx, &tvr);
cx->weakRoots.newborn[GCX_OBJECT] = (JSGCThing *) obj;
return obj;
bad:
obj = NULL;
goto out;
}
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
};
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 = 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)) {
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);
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;
JS_ASSERT(obj->slots);
if (cx->runtime->objectHook)
cx->runtime->objectHook(cx, obj, JS_FALSE, cx->runtime->objectHookData);
/* Remove all watchpoints with weak links to obj. */
JS_ClearWatchPointsForObject(cx, obj);
/*
* Finalize obj first, in case it needs map and slots. Optimized to use
* LOCKED_OBJ_GET_CLASS instead of OBJ_GET_CLASS, so we avoid "promoting"
* obj's scope from lock-free to lock-full (see jslock.c:ClaimScope) when
* we're called from the GC. Only the GC should call js_FinalizeObject,
* and no other threads run JS (and possibly racing to update obj->slots)
* while the GC is running.
*/
LOCKED_OBJ_GET_CLASS(obj)->finalize(cx, obj);
/* Drop map and free slots. */
js_DropObjectMap(cx, map, obj);
obj->map = NULL;
FreeSlots(cx, obj->slots);
obj->slots = NULL;
}
/* XXXbe if one adds props, deletes earlier props, adds more, the last added
won't recycle the deleted props' slots. */
JSBool
js_AllocSlot(JSContext *cx, JSObject *obj, uint32 *slotp)
{
JSObjectMap *map;
JSClass *clasp;
uint32 nslots;
jsval *newslots;
map = obj->map;
JS_ASSERT(!MAP_IS_NATIVE(map) || ((JSScope *)map)->object == obj);
clasp = LOCKED_OBJ_GET_CLASS(obj);
if (map->freeslot == JSSLOT_FREE(clasp)) {
/* Adjust map->freeslot to include computed reserved slots, if any. */
if (clasp->reserveSlots)
map->freeslot += clasp->reserveSlots(cx, obj);
}
nslots = map->nslots;
if (map->freeslot >= nslots) {
nslots = map->freeslot;
JS_ASSERT(nslots >= JS_INITIAL_NSLOTS);
nslots += (nslots + 1) / 2;
newslots = AllocSlots(cx, obj->slots, nslots);
if (!newslots)
return JS_FALSE;
map->nslots = nslots;
obj->slots = newslots;
}
*slotp = map->freeslot++;
return JS_TRUE;
}
void
js_FreeSlot(JSContext *cx, JSObject *obj, uint32 slot)
{
JSObjectMap *map;
uint32 nslots;
jsval *newslots;
OBJ_CHECK_SLOT(obj, slot);
obj->slots[slot] = JSVAL_VOID;
map = obj->map;
JS_ASSERT(!MAP_IS_NATIVE(map) || ((JSScope *)map)->object == obj);
if (map->freeslot == slot + 1)
map->freeslot = slot;
nslots = map->nslots;
if (nslots > JS_INITIAL_NSLOTS && map->freeslot < nslots / 2) {
nslots = map->freeslot;
nslots += nslots / 2;
if (nslots < JS_INITIAL_NSLOTS)
nslots = JS_INITIAL_NSLOTS;
newslots = AllocSlots(cx, obj->slots, nslots);
if (!newslots)
return;
map->nslots = nslots;
obj->slots = newslots;
}
}
/* JSVAL_INT_MAX as a string */
#define JSVAL_INT_MAX_STRING "1073741823"
#define CHECK_FOR_STRING_INDEX(id) \
JS_BEGIN_MACRO \
if (JSID_IS_ATOM(id)) { \
JSAtom *atom_ = JSID_TO_ATOM(id); \
JSString *str_ = ATOM_TO_STRING(atom_); \
const jschar *cp_ = str_->chars; \
JSBool negative_ = (*cp_ == '-'); \
if (negative_) cp_++; \
if (JS7_ISDEC(*cp_)) { \
size_t n_ = str_->length - negative_; \
if (n_ <= sizeof(JSVAL_INT_MAX_STRING) - 1) \
id = CheckForStringIndex(id, cp_, cp_ + n_, negative_); \
} \
} \
JS_END_MACRO
static jsid
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
HidePropertyName(JSContext *cx, jsid *idp)
{
jsid id;
JSAtom *atom, *hidden;
id = *idp;
JS_ASSERT(JSID_IS_ATOM(id));
atom = JSID_TO_ATOM(id);
JS_ASSERT(!(atom->flags & ATOM_HIDDEN));
JS_ASSERT(ATOM_IS_STRING(atom));
hidden = js_AtomizeString(cx, ATOM_TO_STRING(atom), ATOM_HIDDEN);
if (!hidden)
return JS_FALSE;
/*
* Link hidden to unhidden atom to optimize call_enumerate -- this means
* the GC must mark a hidden atom's unhidden counterpart (see js_MarkAtom
* in jsgc.c). It uses the atom's entry.value member for this linkage.
*/
hidden->entry.value = atom;
*idp = ATOM_TO_JSID(hidden);
return JS_TRUE;
}
JSScopeProperty *
js_AddHiddenProperty(JSContext *cx, JSObject *obj, jsid id,
JSPropertyOp getter, JSPropertyOp setter, uint32 slot,
uintN attrs, uintN flags, intN shortid)
{
if (!HidePropertyName(cx, &id))
return NULL;
flags |= SPROP_IS_HIDDEN;
return js_AddNativeProperty(cx, obj, id, getter, setter, slot, attrs,
flags, shortid);
}
JSBool
js_LookupHiddenProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
JSProperty **propp)
{
return HidePropertyName(cx, &id) &&
js_LookupPropertyWithFlags(cx, obj, id, JSRESOLVE_HIDDEN,
objp, propp);
}
JSScopeProperty *
js_AddNativeProperty(JSContext *cx, JSObject *obj, jsid id,
JSPropertyOp getter, JSPropertyOp setter, uint32 slot,
uintN attrs, uintN flags, intN shortid)
{
JSScope *scope;
JSScopeProperty *sprop;
JS_LOCK_OBJ(cx, obj);
scope = js_GetMutableScope(cx, obj);
if (!scope) {
sprop = NULL;
} else {
/*
* Handle old bug that took empty string as zero index. Also convert
* string indices to integers if appropriate.
*/
CHECK_FOR_STRING_INDEX(id);
sprop = js_AddScopeProperty(cx, scope, id, getter, setter, slot, attrs,
flags, shortid);
}
JS_UNLOCK_OBJ(cx, obj);
return sprop;
}
JSScopeProperty *
js_ChangeNativePropertyAttrs(JSContext *cx, JSObject *obj,
JSScopeProperty *sprop, uintN attrs, uintN mask,
JSPropertyOp getter, JSPropertyOp setter)
{
JSScope *scope;
JS_LOCK_OBJ(cx, obj);
scope = js_GetMutableScope(cx, obj);
if (!scope) {
sprop = NULL;
} else {
sprop = js_ChangeScopePropertyAttrs(cx, scope, sprop, attrs, mask,
getter, setter);
if (sprop) {
PROPERTY_CACHE_FILL(&cx->runtime->propertyCache, obj, sprop->id,
sprop);
}
}
JS_UNLOCK_OBJ(cx, obj);
return sprop;
}
JSBool
js_DefineProperty(JSContext *cx, JSObject *obj, jsid id, jsval value,
JSPropertyOp getter, JSPropertyOp setter, uintN attrs,
JSProperty **propp)
{
return js_DefineNativeProperty(cx, obj, id, value, getter, setter, attrs,
0, 0, propp);
}
/*
* Backward compatibility requires allowing addProperty hooks to mutate the
* nominal initial value of a slot-full property, while GC safety wants that
* value to be stored before the call-out through the hook. Optimize to do
* both while saving cycles for classes that stub their addProperty hook.
*/
#define ADD_PROPERTY_HELPER(cx,clasp,obj,scope,sprop,vp,cleanup) \
JS_BEGIN_MACRO \
if ((clasp)->addProperty != JS_PropertyStub) { \
jsval nominal_ = *(vp); \
if (!(clasp)->addProperty(cx, obj, SPROP_USERID(sprop), vp)) { \
cleanup; \
} \
if (*(vp) != nominal_) { \
if (SPROP_HAS_VALID_SLOT(sprop, scope)) \
LOCKED_OBJ_SET_SLOT(obj, (sprop)->slot, *(vp)); \
} \
} \
JS_END_MACRO
JSBool
js_DefineNativeProperty(JSContext *cx, JSObject *obj, jsid id, jsval value,
JSPropertyOp getter, JSPropertyOp setter, uintN attrs,
uintN flags, intN shortid, JSProperty **propp)
{
JSClass *clasp;
JSScope *scope;
JSScopeProperty *sprop;
/*
* Handle old bug that took empty string as zero index. Also convert
* string indices to integers if appropriate.
*/
CHECK_FOR_STRING_INDEX(id);
#if JS_HAS_GETTER_SETTER
/*
* If defining a getter or setter, we must check for its counterpart and
* update the attributes and property ops. A getter or setter is really
* only half of a property.
*/
if (attrs & (JSPROP_GETTER | JSPROP_SETTER)) {
JSObject *pobj;
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;
goto out;
}
if (prop) {
/* NB: call OBJ_DROP_PROPERTY, as pobj might not be native. */
OBJ_DROP_PROPERTY(cx, pobj, prop);
prop = NULL;
}
}
#endif /* JS_HAS_GETTER_SETTER */
/* Lock if object locking is required by this implementation. */
JS_LOCK_OBJ(cx, obj);
/* Use the object's class getter and setter by default. */
clasp = LOCKED_OBJ_GET_CLASS(obj);
if (!getter)
getter = clasp->getProperty;
if (!setter)
setter = clasp->setProperty;
/* Get obj's own scope if it has one, or create a new one for obj. */
scope = js_GetMutableScope(cx, obj);
if (!scope)
goto bad;
/* Add the property to scope, or replace an existing one of the same id. */
if (clasp->flags & JSCLASS_SHARE_ALL_PROPERTIES)
attrs |= JSPROP_SHARED;
sprop = js_AddScopeProperty(cx, scope, id, getter, setter,
SPROP_INVALID_SLOT, attrs, flags, shortid);
if (!sprop)
goto bad;
/* Store value before calling addProperty, in case the latter GC's. */
if (SPROP_HAS_VALID_SLOT(sprop, scope))
LOCKED_OBJ_SET_SLOT(obj, sprop->slot, value);
/* XXXbe called with lock held */
ADD_PROPERTY_HELPER(cx, clasp, obj, scope, sprop, &value,
js_RemoveScopeProperty(cx, scope, id);
goto bad);
#if JS_HAS_GETTER_SETTER
out:
#endif
PROPERTY_CACHE_FILL(&cx->runtime->propertyCache, obj, id, sprop);
if (propp)
*propp = (JSProperty *) sprop;
else
JS_UNLOCK_OBJ(cx, obj);
return JS_TRUE;
bad:
JS_UNLOCK_OBJ(cx, obj);
return JS_FALSE;
}
/*
* Given pc pointing after a property accessing bytecode, return true if the
* access is "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++) {
/* General case: a branch or equality op follows the access. */
op = (JSOp) *pc;
if (js_CodeSpec[op].format & JOF_DETECTING)
return JS_TRUE;
/*
* Special case #1: handle (document.all == null). Don't sweat about
* JS1.2's revision of the equality operators here.
*/
if (op == JSOP_NULL) {
if (++pc < endpc)
return *pc == JSOP_EQ || *pc == JSOP_NE;
break;
}
/*
* Special case #2: handle (document.all == undefined). Don't worry
* about someone redefining undefined, which was added by Edition 3,
* so is read/write for backward compatibility.
*/
if (op == JSOP_NAME) {
atom = GET_ATOM(cx, script, pc);
if (atom == cx->runtime->atomState.typeAtoms[JSTYPE_VOID] &&
(pc += js_CodeSpec[op].length) < endpc) {
op = (JSOp) *pc;
return op == JSOP_EQ || op == JSOP_NE ||
op == JSOP_NEW_EQ || op == JSOP_NEW_NE;
}
break;
}
/* At this point, anything but grouping means we're not detecting. */
if (op != JSOP_GROUP)
break;
}
return JS_FALSE;
}
JS_FRIEND_API(JSBool)
js_LookupProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
JSProperty **propp)
{
return js_LookupPropertyWithFlags(cx, obj, id, 0, objp, propp);
}
JSBool
js_LookupPropertyWithFlags(JSContext *cx, JSObject *obj, jsid id, uintN flags,
JSObject **objp, JSProperty **propp)
{
JSObject *start, *obj2, *proto;
JSScope *scope;
JSScopeProperty *sprop;
JSClass *clasp;
JSResolveOp resolve;
JSResolvingKey key;
JSResolvingEntry *entry;
uint32 generation;
JSNewResolveOp newresolve;
jsbytecode *pc;
const JSCodeSpec *cs;
uint32 format;
JSBool ok;
JSTempValueRooter tvr, tvr2;
/*
* Handle old bug that took empty string as zero index. Also convert
* string indices to integers if appropriate.
*/
CHECK_FOR_STRING_INDEX(id);
/* Search scopes starting with obj and following the prototype link. */
start = obj;
for (;;) {
JS_LOCK_OBJ(cx, obj);
scope = OBJ_SCOPE(obj);
if (scope->object == obj) {
sprop = SCOPE_GET_PROPERTY(scope, id);
} else {
/* Shared prototype scope: try resolve before lookup. */
sprop = NULL;
}
/* Try obj's class resolve hook if id was not found in obj's scope. */
if (!sprop) {
clasp = LOCKED_OBJ_GET_CLASS(obj);
resolve = clasp->resolve;
if (resolve != JS_ResolveStub) {
/* Avoid recursion on (obj, id) already being resolved on cx. */
key.obj = obj;
key.id = id;
/*
* Once we have successfully added an entry for (obj, key) to
* cx->resolvingTable, control must go through cleanup: before
* returning. But note that JS_DHASH_ADD may find an existing
* entry, in which case we bail to suppress runaway recursion.
*/
if (!js_StartResolving(cx, &key, JSRESFLAG_LOOKUP, &entry)) {
JS_UNLOCK_OBJ(cx, obj);
return JS_FALSE;
}
if (!entry) {
/* Already resolving id in obj -- 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 &&
(pc = cx->fp->pc)) {
cs = &js_CodeSpec[*pc];
format = cs->format;
if ((format & JOF_MODEMASK) != JOF_NAME)
flags |= JSRESOLVE_QUALIFIED;
if ((format & JOF_ASSIGNING) ||
(cx->fp->flags & JSFRAME_ASSIGNING)) {
flags |= JSRESOLVE_ASSIGNING;
} else {
pc += cs->length;
if (Detecting(cx, pc))
flags |= JSRESOLVE_DETECTING;
}
if (format & JOF_DECLARING)
flags |= JSRESOLVE_DECLARING;
}
obj2 = (clasp->flags & JSCLASS_NEW_RESOLVE_GETS_START)
? start
: NULL;
JS_UNLOCK_OBJ(cx, obj);
/* Protect id and all atoms from a GC nested in resolve. */
JS_KEEP_ATOMS(cx->runtime);
ok = newresolve(cx, obj, ID_TO_VALUE(id), flags, &obj2);
JS_UNKEEP_ATOMS(cx->runtime);
if (!ok)
goto cleanup;
JS_LOCK_OBJ(cx, obj);
if (obj2) {
/* Resolved: juggle locks and lookup id again. */
if (obj2 != obj) {
JS_UNLOCK_OBJ(cx, obj);
if (OBJ_IS_NATIVE(obj2))
JS_LOCK_OBJ(cx, obj2);
}
scope = OBJ_SCOPE(obj2);
if (!MAP_IS_NATIVE(&scope->map)) {
/* Whoops, newresolve handed back a foreign obj2. */
JS_ASSERT(obj2 != obj);
JS_PUSH_SINGLE_TEMP_ROOT(cx, OBJECT_TO_JSVAL(obj2), &tvr);
ok = OBJ_LOOKUP_PROPERTY(cx, obj2, id, objp, propp);
JS_POP_TEMP_ROOT(cx, &tvr);
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) {
if (OBJ_IS_NATIVE(obj2))
JS_UNLOCK_OBJ(cx, obj2);
JS_LOCK_OBJ(cx, obj);
}
}
} else {
/*
* Old resolve always requires id re-lookup if obj owns
* its scope after resolve returns.
*/
JS_UNLOCK_OBJ(cx, obj);
ok = resolve(cx, obj, ID_TO_VALUE(id));
if (!ok)
goto cleanup;
JS_LOCK_OBJ(cx, obj);
scope = OBJ_SCOPE(obj);
JS_ASSERT(MAP_IS_NATIVE(&scope->map));
if (scope->object == obj)
sprop = SCOPE_GET_PROPERTY(scope, id);
}
cleanup:
js_StopResolving(cx, &key, JSRESFLAG_LOOKUP, entry, generation);
if (!ok || *propp)
return ok;
}
}
if (sprop) {
JS_ASSERT(OBJ_SCOPE(obj) == scope);
*objp = scope->object; /* XXXbe hide in jsscope.[ch] */
*propp = (JSProperty *) sprop;
return JS_TRUE;
}
proto = LOCKED_OBJ_GET_PROTO(obj);
JS_UNLOCK_OBJ(cx, obj);
if (!proto)
break;
if (!OBJ_IS_NATIVE(proto)) {
JSBool ret;
JS_PUSH_SINGLE_TEMP_ROOT(cx, OBJECT_TO_JSVAL(proto), &tvr2);
ret = OBJ_LOOKUP_PROPERTY(cx, proto, id, objp, propp);
JS_POP_TEMP_ROOT(cx, &tvr2);
return ret;
}
obj = proto;
}
out:
*objp = NULL;
*propp = NULL;
return JS_TRUE;
}
JS_FRIEND_API(JSBool)
js_FindProperty(JSContext *cx, jsid id, JSObject **objp, JSObject **pobjp,
JSProperty **propp)
{
JSRuntime *rt;
JSObject *obj, *pobj, *lastobj;
JSScopeProperty *sprop;
JSProperty *prop;
rt = cx->runtime;
obj = cx->fp->scopeChain;
do {
/* Try the property cache and return immediately on cache hit. */
if (OBJ_IS_NATIVE(obj)) {
JS_LOCK_OBJ(cx, obj);
PROPERTY_CACHE_TEST(&rt->propertyCache, obj, id, sprop);
if (sprop) {
JS_ASSERT(OBJ_IS_NATIVE(obj));
*objp = obj;
*pobjp = obj;
*propp = (JSProperty *) sprop;
return JS_TRUE;
}
JS_UNLOCK_OBJ(cx, obj);
}
/* If cache miss, take the slow path. */
if (!OBJ_LOOKUP_PROPERTY(cx, obj, id, &pobj, &prop))
return JS_FALSE;
if (prop) {
if (OBJ_IS_NATIVE(pobj)) {
sprop = (JSScopeProperty *) prop;
PROPERTY_CACHE_FILL(&rt->propertyCache, pobj, id, sprop);
}
*objp = obj;
*pobjp = pobj;
*propp = prop;
return JS_TRUE;
}
lastobj = obj;
} while ((obj = OBJ_GET_PARENT(cx, obj)) != NULL);
*objp = lastobj;
*pobjp = NULL;
*propp = NULL;
return JS_TRUE;
}
JSObject *
js_FindIdentifierBase(JSContext *cx, jsid id)
{
JSObject *obj, *pobj;
JSProperty *prop;
/*
* Look for id's property along the "with" statement chain and the
* statically-linked scope chain.
*/
if (!js_FindProperty(cx, id, &obj, &pobj, &prop))
return NULL;
if (prop) {
OBJ_DROP_PROPERTY(cx, pobj, prop);
return obj;
}
/*
* Use the top-level scope from the scope chain, which won't end in the
* same scope as cx->globalObject for cross-context function calls.
*/
JS_ASSERT(obj);
/*
* Property not found. Give a strict warning if binding an undeclared
* top-level variable.
*/
if (JS_HAS_STRICT_OPTION(cx)) {
JSString *str = JSVAL_TO_STRING(ID_TO_VALUE(id));
if (!JS_ReportErrorFlagsAndNumber(cx,
JSREPORT_WARNING | JSREPORT_STRICT,
js_GetErrorMessage, NULL,
JSMSG_UNDECLARED_VAR,
JS_GetStringBytes(str))) {
return NULL;
}
}
return obj;
}
JSBool
js_NativeGet(JSContext *cx, JSObject *obj, JSObject *pobj,
JSScopeProperty *sprop, jsval *vp)
{
JSScope *scope;
uint32 slot;
int32 sample;
JSTempValueRooter tvr, tvr2;
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);
JS_PUSH_TEMP_ROOT_OBJECT(cx, pobj, &tvr2);
ok = SPROP_GET(cx, sprop, obj, pobj, vp);
JS_POP_TEMP_ROOT(cx, &tvr2);
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:
GC_POKE(cx, pval);
LOCKED_OBJ_SET_SLOT(obj, slot, *vp);
}
return JS_TRUE;
}
JSBool
js_GetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
{
JSObject *obj2;
JSProperty *prop;
JSScopeProperty *sprop;
/*
* Handle old bug that took empty string as zero index. Also convert
* string indices to integers if appropriate.
*/
CHECK_FOR_STRING_INDEX(id);
if (!js_LookupProperty(cx, obj, id, &obj2, &prop))
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;
/*
* 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 && (pc = cx->fp->pc)) {
JSOp op;
uintN flags;
JSString *str;
op = *pc;
if (op == JSOP_GETXPROP || op == JSOP_GETXELEM) {
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. */
str = js_DecompileValueGenerator(cx, JSDVG_IGNORE_STACK,
ID_TO_VALUE(id), NULL);
if (!str ||
!JS_ReportErrorFlagsAndNumber(cx, flags,
js_GetErrorMessage, NULL,
JSMSG_UNDEFINED_PROP,
JS_GetStringBytes(str))) {
return JS_FALSE;
}
}
return JS_TRUE;
}
if (!OBJ_IS_NATIVE(obj2)) {
OBJ_DROP_PROPERTY(cx, obj2, prop);
return OBJ_GET_PROPERTY(cx, obj2, id, vp);
}
sprop = (JSScopeProperty *) prop;
if (!js_NativeGet(cx, obj, obj2, sprop, vp))
return JS_FALSE;
PROPERTY_CACHE_FILL(&cx->runtime->propertyCache, obj2, id, sprop);
JS_UNLOCK_OBJ(cx, obj2);
return JS_TRUE;
}
JSBool
js_SetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
{
JSObject *pobj;
JSProperty *prop;
JSScopeProperty *sprop;
JSScope *scope;
uintN attrs, flags;
intN shortid;
JSClass *clasp;
JSPropertyOp getter, setter;
/*
* Handle old bug that took empty string as zero index. Also convert
* string indices to integers if appropriate.
*/
CHECK_FOR_STRING_INDEX(id);
if (!js_LookupProperty(cx, obj, id, &pobj, &prop))
return JS_FALSE;
if (prop && !OBJ_IS_NATIVE(pobj)) {
OBJ_DROP_PROPERTY(cx, pobj, prop);
prop = NULL;
}
sprop = (JSScopeProperty *) prop;
/*
* Now either sprop is null, meaning id was not found in obj or one of its
* prototypes; or sprop is non-null, meaning id was found in pobj's scope.
* If JS_THREADSAFE and sprop is non-null, then scope is locked, and sprop
* is held: we must OBJ_DROP_PROPERTY or JS_UNLOCK_SCOPE before we return
* (the two are equivalent for native objects, but we use JS_UNLOCK_SCOPE
* because it is cheaper).
*/
attrs = JSPROP_ENUMERATE;
flags = 0;
shortid = 0;
clasp = OBJ_GET_CLASS(cx, obj);
getter = clasp->getProperty;
setter = clasp->setProperty;
if (sprop) {
/*
* Set scope for use below. It was locked by js_LookupProperty, and
* we know pobj owns it (i.e., scope->object == pobj). Therefore we
* optimize JS_UNLOCK_OBJ(cx, pobj) into JS_UNLOCK_SCOPE(cx, scope).
*/
scope = OBJ_SCOPE(pobj);
attrs = sprop->attrs;
if ((attrs & JSPROP_READONLY) ||
(SCOPE_IS_SEALED(scope) && pobj == obj)) {
JS_UNLOCK_SCOPE(cx, scope);
/*
* Here, we'll either return true or goto read_only_error, which
* reports a strict warning or throws an error. So we redefine
* the |flags| local variable to be JSREPORT_* flags to pass to
* JS_ReportErrorFlagsAndNumberUC at label read_only_error. We
* must likewise re-task flags further below for the other 'goto
* read_only_error;' case.
*/
flags = JSREPORT_ERROR;
if ((attrs & JSPROP_READONLY) && JS_VERSION_IS_ECMA(cx)) {
if (!JS_HAS_STRICT_OPTION(cx)) {
/* Just return true per ECMA if not in strict mode. */
return JS_TRUE;
}
/* Strict mode: report a read-only strict warning. */
flags = JSREPORT_STRICT | JSREPORT_WARNING;
}
goto read_only_error;
}
if (pobj != obj) {
/*
* We found id in a prototype object: prepare to share or shadow.
* NB: Thanks to the immutable, garbage-collected property tree
* maintained by jsscope.c in cx->runtime, we needn't worry about
* sprop going away behind our back after we've unlocked scope.
*/
JS_UNLOCK_SCOPE(cx, scope);
/* Don't clone a shared prototype property. */
if (attrs & JSPROP_SHARED) {
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;
}
/* Find or make a property descriptor with the right heritage. */
JS_LOCK_OBJ(cx, obj);
scope = js_GetMutableScope(cx, obj);
if (!scope) {
JS_UNLOCK_OBJ(cx, obj);
return JS_FALSE;
}
if (clasp->flags & JSCLASS_SHARE_ALL_PROPERTIES)
attrs |= JSPROP_SHARED;
sprop = js_AddScopeProperty(cx, scope, id, getter, setter,
SPROP_INVALID_SLOT, attrs, flags, shortid);
if (!sprop) {
JS_UNLOCK_SCOPE(cx, scope);
return JS_FALSE;
}
/*
* Initialize the new property value (passed to setter) to undefined.
* Note that we store before calling addProperty, to match the order
* in js_DefineNativeProperty.
*/
if (SPROP_HAS_VALID_SLOT(sprop, scope))
LOCKED_OBJ_SET_SLOT(obj, sprop->slot, JSVAL_VOID);
/* XXXbe called with obj locked */
ADD_PROPERTY_HELPER(cx, clasp, obj, scope, sprop, vp,
js_RemoveScopeProperty(cx, scope, id);
JS_UNLOCK_SCOPE(cx, scope);
return JS_FALSE);
PROPERTY_CACHE_FILL(&cx->runtime->propertyCache, obj, id, sprop);
}
if (!js_NativeSet(cx, obj, sprop, vp))
return JS_FALSE;
JS_UNLOCK_SCOPE(cx, scope);
return JS_TRUE;
read_only_error: {
JSString *str = js_DecompileValueGenerator(cx,
JSDVG_IGNORE_STACK,
ID_TO_VALUE(id),
NULL);
if (!str)
return JS_FALSE;
return JS_ReportErrorFlagsAndNumberUC(cx, flags, js_GetErrorMessage,
NULL, JSMSG_READ_ONLY,
JS_GetStringChars(str));
}
}
JSBool
js_GetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop,
uintN *attrsp)
{
JSBool noprop, ok;
JSScopeProperty *sprop;
noprop = !prop;
if (noprop) {
if (!js_LookupProperty(cx, obj, id, &obj, &prop))
return JS_FALSE;
if (!prop) {
*attrsp = 0;
return JS_TRUE;
}
if (!OBJ_IS_NATIVE(obj)) {
ok = OBJ_GET_ATTRIBUTES(cx, obj, id, prop, attrsp);
OBJ_DROP_PROPERTY(cx, obj, prop);
return ok;
}
}
sprop = (JSScopeProperty *)prop;
*attrsp = sprop->attrs;
if (noprop)
OBJ_DROP_PROPERTY(cx, obj, prop);
return JS_TRUE;
}
JSBool
js_SetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop,
uintN *attrsp)
{
JSBool noprop, ok;
JSScopeProperty *sprop;
noprop = !prop;
if (noprop) {
if (!js_LookupProperty(cx, obj, id, &obj, &prop))
return JS_FALSE;
if (!prop)
return JS_TRUE;
if (!OBJ_IS_NATIVE(obj)) {
ok = OBJ_SET_ATTRIBUTES(cx, obj, id, prop, attrsp);
OBJ_DROP_PROPERTY(cx, obj, prop);
return ok;
}
}
sprop = (JSScopeProperty *)prop;
sprop = js_ChangeNativePropertyAttrs(cx, obj, sprop, *attrsp, 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;
JSString *str;
JSScope *scope;
JSBool ok;
*rval = JSVAL_TRUE;
/*
* Handle old bug that took empty string as zero index. Also convert
* string indices to integers if appropriate.
*/
CHECK_FOR_STRING_INDEX(id);
if (!js_LookupProperty(cx, obj, id, &proto, &prop))
return JS_FALSE;
if (!prop || proto != obj) {
/*
* If the property was found in a native prototype, check whether it's
* shared and permanent. Such a property stands for direct properties
* in all delegating objects, matching ECMA semantics without bloating
* each delegating object.
*/
if (prop) {
if (OBJ_IS_NATIVE(proto)) {
sprop = (JSScopeProperty *)prop;
if (SPROP_IS_SHARED_PERMANENT(sprop))
*rval = JSVAL_FALSE;
}
OBJ_DROP_PROPERTY(cx, proto, prop);
if (*rval == JSVAL_FALSE)
return JS_TRUE;
}
/*
* If no property, or the property comes unshared or impermanent from
* a prototype, call the class's delProperty hook, passing rval as the
* result parameter.
*/
return OBJ_GET_CLASS(cx, obj)->delProperty(cx, obj, ID_TO_VALUE(id),
rval);
}
sprop = (JSScopeProperty *)prop;
if (sprop->attrs & JSPROP_PERMANENT) {
OBJ_DROP_PROPERTY(cx, obj, prop);
if (JS_VERSION_IS_ECMA(cx)) {
*rval = JSVAL_FALSE;
return JS_TRUE;
}
str = js_DecompileValueGenerator(cx, JSDVG_IGNORE_STACK,
ID_TO_VALUE(id), NULL);
if (str) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_PERMANENT, JS_GetStringBytes(str));
}
return JS_FALSE;
}
/* XXXbe called with obj locked */
if (!LOCKED_OBJ_GET_CLASS(obj)->delProperty(cx, obj, SPROP_USERID(sprop),
rval)) {
OBJ_DROP_PROPERTY(cx, obj, prop);
return JS_FALSE;
}
scope = OBJ_SCOPE(obj);
if (SPROP_HAS_VALID_SLOT(sprop, scope))
GC_POKE(cx, LOCKED_OBJ_GET_SLOT(obj, sprop->slot));
PROPERTY_CACHE_FILL(&cx->runtime->propertyCache, obj, id, NULL);
ok = js_RemoveScopeProperty(cx, scope, id);
OBJ_DROP_PROPERTY(cx, obj, prop);
return ok;
}
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 through js_DecompileValueGenerator. */
if (hint == JSTYPE_STRING) {
str = JS_InternString(cx, OBJ_GET_CLASS(cx, obj)->name);
if (!str)
return JS_FALSE;
} else {
str = NULL;
}
*vp = OBJECT_TO_JSVAL(obj);
str = js_DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, save, str);
if (str) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_CANT_CONVERT_TO,
JS_GetStringBytes(str),
(hint == JSTYPE_VOID)
? "primitive type"
: js_type_strs[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)
return ((JSNewEnumerateOp) enumerate)(cx, obj, enum_op, statep, idp);
switch (enum_op) {
case JSENUMERATE_INIT:
if (!enumerate(cx, obj))
return JS_FALSE;
length = 0;
/*
* The set of all property ids is pre-computed when the iterator
* is initialized so as to avoid problems with properties being
* deleted during the iteration.
*/
JS_LOCK_OBJ(cx, obj);
scope = OBJ_SCOPE(obj);
/*
* If this object shares a scope with its prototype, don't enumerate
* its properties. Otherwise they will be enumerated a second time
* when the prototype object is enumerated.
*/
proto = OBJ_GET_PROTO(cx, obj);
if (proto && scope == OBJ_SCOPE(proto)) {
ida = js_NewIdArray(cx, 0);
if (!ida) {
JS_UNLOCK_OBJ(cx, obj);
return JS_FALSE;
}
} else {
/* Object has a private scope; Enumerate all props in scope. */
for (sprop = lastProp = SCOPE_LAST_PROP(scope); sprop;
sprop = sprop->parent) {
if ((
#ifdef DUMP_CALL_TABLE
(cx->options & JSOPTION_LOGCALL_TOSOURCE) ||
#endif
(sprop->attrs & JSPROP_ENUMERATE)) &&
!(sprop->flags & SPROP_IS_ALIAS) &&
(!SCOPE_HAD_MIDDLE_DELETE(scope) ||
SCOPE_HAS_PROPERTY(scope, sprop))) {
length++;
}
}
ida = js_NewIdArray(cx, length);
if (!ida) {
JS_UNLOCK_OBJ(cx, obj);
return JS_FALSE;
}
i = length;
for (sprop = lastProp; sprop; sprop = sprop->parent) {
if ((
#ifdef DUMP_CALL_TABLE
(cx->options & JSOPTION_LOGCALL_TOSOURCE) ||
#endif
(sprop->attrs & JSPROP_ENUMERATE)) &&
!(sprop->flags & SPROP_IS_ALIAS) &&
(!SCOPE_HAD_MIDDLE_DELETE(scope) ||
SCOPE_HAS_PROPERTY(scope, sprop))) {
JS_ASSERT(i > 0);
ida->vector[--i] = sprop->id;
}
}
}
JS_UNLOCK_OBJ(cx, obj);
state = (JSNativeIteratorState *)
JS_malloc(cx, sizeof(JSNativeIteratorState));
if (!state) {
JS_DestroyIdArray(cx, ida);
return JS_FALSE;
}
state->ida = ida;
state->next_index = 0;
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_MarkNativeIteratorStates(JSContext *cx)
{
JSNativeIteratorState *state;
jsid *cursor, *end, id;
state = cx->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;
MARK_ID(cx, 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 = OBJ_GET_SLOT(cx, obj, JSSLOT_PROTO);
*attrsp = JSPROP_PERMANENT;
break;
case JSACC_PARENT:
JS_ASSERT(!writing);
pobj = obj;
*vp = OBJ_GET_SLOT(cx, obj, JSSLOT_PARENT);
*attrsp = JSPROP_READONLY | JSPROP_PERMANENT;
break;
default:
if (!js_LookupProperty(cx, obj, id, &pobj, &prop))
return JS_FALSE;
if (!prop) {
if (!writing)
*vp = JSVAL_VOID;
*attrsp = 0;
clasp = OBJ_GET_CLASS(cx, obj);
return !clasp->checkAccess ||
clasp->checkAccess(cx, obj, ID_TO_VALUE(id), mode, vp);
}
if (!OBJ_IS_NATIVE(pobj)) {
OBJ_DROP_PROPERTY(cx, pobj, prop);
return OBJ_CHECK_ACCESS(cx, pobj, id, mode, vp, attrsp);
}
sprop = (JSScopeProperty *)prop;
*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
static void
ReportIsNotFunction(JSContext *cx, jsval *vp, uintN flags)
{
/*
* The decompiler may need to access the args of the function in
* progress rather than the one we had hoped to call.
* So we switch the cx->fp to the frame below us. We stick the
* current frame in the dormantFrameChain to protect it from gc.
*/
JSStackFrame *fp = cx->fp;
if (fp->down) {
JS_ASSERT(!fp->dormantNext);
fp->dormantNext = cx->dormantFrameChain;
cx->dormantFrameChain = fp;
cx->fp = fp->down;
}
js_ReportIsNotFunction(cx, vp, flags);
if (fp->down) {
JS_ASSERT(cx->dormantFrameChain == fp);
cx->dormantFrameChain = fp->dormantNext;
fp->dormantNext = NULL;
cx->fp = fp;
}
}
#ifdef NARCISSUS
static JSBool
GetCurrentExecutionContext(JSContext *cx, JSObject *obj, jsval *rval)
{
JSObject *tmp;
jsval xcval;
while ((tmp = OBJ_GET_PARENT(cx, obj)) != NULL)
obj = tmp;
if (!OBJ_GET_PROPERTY(cx, obj,
ATOM_TO_JSID(cx->runtime->atomState
.ExecutionContextAtom),
&xcval)) {
return JS_FALSE;
}
if (JSVAL_IS_PRIMITIVE(xcval)) {
JS_ReportError(cx, "invalid ExecutionContext in global object");
return JS_FALSE;
}
if (!OBJ_GET_PROPERTY(cx, JSVAL_TO_OBJECT(xcval),
ATOM_TO_JSID(cx->runtime->atomState.currentAtom),
rval)) {
return JS_FALSE;
}
return JS_TRUE;
}
#endif
JSBool
js_Call(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
JSClass *clasp;
clasp = OBJ_GET_CLASS(cx, JSVAL_TO_OBJECT(argv[-2]));
if (!clasp->call) {
#ifdef NARCISSUS
JSObject *callee, *args;
jsval fval, nargv[3];
JSBool ok;
callee = JSVAL_TO_OBJECT(argv[-2]);
if (!OBJ_GET_PROPERTY(cx, callee,
ATOM_TO_JSID(cx->runtime->atomState.callAtom),
&fval)) {
return JS_FALSE;
}
if (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
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
ReportIsNotFunction(cx, &argv[-2], JSV2F_CONSTRUCT);
return JS_FALSE;
}
return clasp->construct(cx, obj, argc, argv, rval);
}
JSBool
js_HasInstance(JSContext *cx, JSObject *obj, jsval v, JSBool *bp)
{
JSClass *clasp;
JSString *str;
clasp = OBJ_GET_CLASS(cx, obj);
if (clasp->hasInstance)
return clasp->hasInstance(cx, obj, v, bp);
#ifdef NARCISSUS
{
jsval fval, rval;
if (!OBJ_GET_PROPERTY(cx, obj,
ATOM_TO_JSID(cx->runtime->atomState
.hasInstanceAtom),
&fval)) {
return JS_FALSE;
}
if (VALUE_IS_FUNCTION(cx, fval)) {
return js_InternalCall(cx, obj, fval, 1, &v, &rval) &&
js_ValueToBoolean(cx, rval, bp);
}
}
#endif
str = js_DecompileValueGenerator(cx, JSDVG_SEARCH_STACK,
OBJECT_TO_JSVAL(obj), NULL);
if (str) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_BAD_INSTANCEOF_RHS,
JS_GetStringBytes(str));
}
return JS_FALSE;
}
JSBool
js_IsDelegate(JSContext *cx, JSObject *obj, jsval v, JSBool *bp)
{
JSObject *obj2;
*bp = JS_FALSE;
if (JSVAL_IS_PRIMITIVE(v))
return JS_TRUE;
obj2 = JSVAL_TO_OBJECT(v);
while ((obj2 = OBJ_GET_PROTO(cx, obj2)) != NULL) {
if (obj2 == obj) {
*bp = JS_TRUE;
break;
}
}
return JS_TRUE;
}
JSBool
js_GetClassPrototype(JSContext *cx, 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_KEY(atom));
return OBJ_CHECK_ACCESS(cx, obj, ATOM_TO_JSID(atom), JSACC_READ,
vp, &attrs);
}
static JSBool
CheckCtorSetAccess(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
JSAtom *atom;
uintN attrs;
atom = cx->runtime->atomState.constructorAtom;
JS_ASSERT(id == ATOM_KEY(atom));
return OBJ_CHECK_ACCESS(cx, obj, ATOM_TO_JSID(atom), JSACC_WRITE,
vp, &attrs);
}
JSBool
js_SetClassPrototype(JSContext *cx, JSObject *ctor, JSObject *proto,
uintN attrs)
{
/*
* Use the given attributes for the prototype property of the constructor,
* as user-defined constructors have a DontDelete prototype (which may be
* reset), while native or "system" constructors have DontEnum | ReadOnly |
* DontDelete.
*/
if (!OBJ_DEFINE_PROPERTY(cx, ctor,
ATOM_TO_JSID(cx->runtime->atomState
.classPrototypeAtom),
OBJECT_TO_JSVAL(proto),
JS_PropertyStub, JS_PropertyStub,
attrs, NULL)) {
return JS_FALSE;
}
/*
* ECMA says that Object.prototype.constructor, or f.prototype.constructor
* for a user-defined function f, is DontEnum.
*/
return OBJ_DEFINE_PROPERTY(cx, proto,
ATOM_TO_JSID(cx->runtime->atomState
.constructorAtom),
OBJECT_TO_JSVAL(ctor),
CheckCtorGetAccess, CheckCtorSetAccess,
0, NULL);
}
JSBool
js_ValueToObject(JSContext *cx, jsval v, JSObject **objp)
{
JSObject *obj;
if (JSVAL_IS_NULL(v) || JSVAL_IS_VOID(v)) {
obj = NULL;
} else if (JSVAL_IS_OBJECT(v)) {
obj = JSVAL_TO_OBJECT(v);
if (!OBJ_DEFAULT_VALUE(cx, obj, JSTYPE_OBJECT, &v))
return JS_FALSE;
if (!JSVAL_IS_PRIMITIVE(v))
obj = JSVAL_TO_OBJECT(v);
} else {
if (JSVAL_IS_STRING(v)) {
obj = js_StringToObject(cx, JSVAL_TO_STRING(v));
} else if (JSVAL_IS_INT(v)) {
obj = js_NumberToObject(cx, (jsdouble)JSVAL_TO_INT(v));
} else if (JSVAL_IS_DOUBLE(v)) {
obj = js_NumberToObject(cx, *JSVAL_TO_DOUBLE(v));
} else {
JS_ASSERT(JSVAL_IS_BOOLEAN(v));
obj = js_BooleanToObject(cx, JSVAL_TO_BOOLEAN(v));
}
if (!obj)
return JS_FALSE;
}
*objp = obj;
return JS_TRUE;
}
JSObject *
js_ValueToNonNullObject(JSContext *cx, jsval v)
{
JSObject *obj;
JSString *str;
if (!js_ValueToObject(cx, v, &obj))
return NULL;
if (!obj) {
str = js_DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, v, NULL);
if (str) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_NO_PROPERTIES, JS_GetStringBytes(str));
}
}
return obj;
}
JSBool
js_TryValueOf(JSContext *cx, JSObject *obj, JSType type, jsval *rval)
{
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;
int stackDummy;
if (!JS_CHECK_STACK_SIZE(cx, stackDummy)) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_OVER_RECURSED);
return JS_FALSE;
}
/*
* Report failure only if an appropriate method was found, and calling it
* returned failure. We propagate failure in this case to make exceptions
* behave properly.
*/
older = JS_SetErrorReporter(cx, NULL);
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_XDRCStringAtom(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 = 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 DEBUG_brendan
#include <stdio.h>
#include <math.h>
uint32 js_entry_count_max;
uint32 js_entry_count_sum;
double js_entry_count_sqsum;
uint32 js_entry_count_hist[11];
static void
MeterEntryCount(uintN count)
{
if (count) {
js_entry_count_sum += count;
js_entry_count_sqsum += (double)count * count;
if (count > js_entry_count_max)
js_entry_count_max = count;
}
js_entry_count_hist[JS_MIN(count, 10)]++;
}
#define DEBUG_scopemeters
#endif /* DEBUG_brendan */
#ifdef DEBUG_scopemeters
void
js_DumpScopeMeters(JSRuntime *rt)
{
static FILE *logfp;
if (!logfp)
logfp = fopen("/tmp/scope.stats", "a");
{
double mean = 0., var = 0., sigma = 0.;
double nscopes = rt->liveScopes;
double nentrys = js_entry_count_sum;
if (nscopes > 0 && nentrys >= 0) {
mean = nentrys / nscopes;
var = nscopes * js_entry_count_sqsum - nentrys * nentrys;
if (var < 0.0 || nscopes <= 1)
var = 0.0;
else
var /= nscopes * (nscopes - 1);
/* Windows says sqrt(0.0) is "-1.#J" (?!) so we must test. */
sigma = (var != 0.) ? sqrt(var) : 0.;
}
fprintf(logfp,
"scopes %g entries %g mean %g sigma %g max %u",
nscopes, nentrys, mean, sigma, js_entry_count_max);
}
fprintf(logfp, " histogram %u %u %u %u %u %u %u %u %u %u %u\n",
js_entry_count_hist[0], js_entry_count_hist[1],
js_entry_count_hist[2], js_entry_count_hist[3],
js_entry_count_hist[4], js_entry_count_hist[5],
js_entry_count_hist[6], js_entry_count_hist[7],
js_entry_count_hist[8], js_entry_count_hist[9],
js_entry_count_hist[10]);
js_entry_count_sum = js_entry_count_max = 0;
js_entry_count_sqsum = 0;
memset(js_entry_count_hist, 0, sizeof js_entry_count_hist);
fflush(logfp);
}
#endif
uint32
js_Mark(JSContext *cx, JSObject *obj, void *arg)
{
JSScope *scope;
JSScopeProperty *sprop;
JSClass *clasp;
JS_ASSERT(OBJ_IS_NATIVE(obj));
scope = OBJ_SCOPE(obj);
#ifdef DEBUG_brendan
if (scope->object == obj)
MeterEntryCount(scope->entryCount);
#endif
JS_ASSERT(!SCOPE_LAST_PROP(scope) ||
SCOPE_HAS_PROPERTY(scope, SCOPE_LAST_PROP(scope)));
for (sprop = SCOPE_LAST_PROP(scope); sprop; sprop = sprop->parent) {
if (SCOPE_HAD_MIDDLE_DELETE(scope) && !SCOPE_HAS_PROPERTY(scope, sprop))
continue;
MARK_SCOPE_PROPERTY(cx, sprop);
}
/* No one runs while the GC is running, so we can use LOCKED_... here. */
clasp = LOCKED_OBJ_GET_CLASS(obj);
if (clasp->mark)
(void) clasp->mark(cx, obj, NULL);
if (scope->object != obj) {
/*
* An unmutated object that shares a prototype's scope. We can't tell
* how many slots are allocated and in use at obj->slots by looking at
* scope, so we get obj->slots' length from its -1'st element.
*/
return (uint32) obj->slots[-1];
}
return JS_MIN(scope->map.freeslot, scope->map.nslots);
}
void
js_Clear(JSContext *cx, JSObject *obj)
{
JSScope *scope;
JSRuntime *rt;
JSScopeProperty *sprop;
uint32 i, n;
/*
* Clear our scope and the property cache of all obj's properties only if
* obj owns the scope (i.e., not if obj is unmutated and therefore sharing
* its prototype's scope). NB: we do not clear any reserved slots lying
* below JSSLOT_FREE(clasp).
*/
JS_LOCK_OBJ(cx, obj);
scope = OBJ_SCOPE(obj);
if (scope->object == obj) {
/* Clear the property cache before we clear the scope. */
rt = cx->runtime;
for (sprop = SCOPE_LAST_PROP(scope); sprop; sprop = sprop->parent) {
if (!SCOPE_HAD_MIDDLE_DELETE(scope) ||
SCOPE_HAS_PROPERTY(scope, sprop)) {
PROPERTY_CACHE_FILL(&rt->propertyCache, obj, sprop->id, NULL);
}
}
/* Now that we're done using scope->lastProp/table, clear scope. */
js_ClearScope(cx, scope);
/* Clear slot values and reset freeslot so we're consistent. */
i = scope->map.nslots;
n = JSSLOT_FREE(LOCKED_OBJ_GET_CLASS(obj));
while (--i >= n)
obj->slots[i] = JSVAL_VOID;
scope->map.freeslot = n;
}
JS_UNLOCK_OBJ(cx, obj);
}
jsval
js_GetRequiredSlot(JSContext *cx, JSObject *obj, uint32 slot)
{
jsval v;
JS_LOCK_OBJ(cx, obj);
v = (slot < (uint32) obj->slots[-1]) ? obj->slots[slot] : JSVAL_VOID;
JS_UNLOCK_OBJ(cx, obj);
return v;
}
JSBool
js_SetRequiredSlot(JSContext *cx, JSObject *obj, uint32 slot, jsval v)
{
JSScope *scope;
uint32 nslots;
JSClass *clasp;
jsval *newslots;
JS_LOCK_OBJ(cx, obj);
scope = OBJ_SCOPE(obj);
nslots = (uint32) obj->slots[-1];
if (slot >= nslots) {
/*
* At this point, obj may or may not own scope. If some path calls
* js_GetMutableScope but does not add a slot-owning property, then
* scope->object == obj but nslots will be nominal. If obj shares a
* prototype's scope, then we cannot update scope->map here, but we
* must update obj->slots[-1] when we grow obj->slots.
*
* See js_Mark, before the last return, where we make a special case
* for unmutated (scope->object != obj) objects.
*/
JS_ASSERT(nslots == JS_INITIAL_NSLOTS);
clasp = LOCKED_OBJ_GET_CLASS(obj);
nslots = JSSLOT_FREE(clasp);
if (clasp->reserveSlots)
nslots += clasp->reserveSlots(cx, obj);
JS_ASSERT(slot < nslots);
newslots = AllocSlots(cx, obj->slots, nslots);
if (!newslots) {
JS_UNLOCK_SCOPE(cx, scope);
return JS_FALSE;
}
if (scope->object == obj)
scope->map.nslots = nslots;
obj->slots = newslots;
}
/* Whether or not we grew nslots, we may need to advance freeslot. */
if (scope->object == obj && slot >= scope->map.freeslot)
scope->map.freeslot = slot + 1;
obj->slots[slot] = v;
JS_UNLOCK_SCOPE(cx, scope);
return JS_TRUE;
}
JS_FRIEND_API(void)
js_SetObjectWeakRoot(JSContext *cx, JSObject *obj)
{
cx->weakRoots.newborn[GCX_OBJECT] = obj;
}
#ifdef DEBUG
/* Routines to print out values during debugging. */
void printChar(jschar *cp) {
fprintf(stderr, "jschar* (0x%p) \"", (void *)cp);
while (*cp)
fputc(*cp++, stderr);
fputc('"', stderr);
fputc('\n', stderr);
}
void printString(JSString *str) {
size_t i, n;
jschar *s;
fprintf(stderr, "string (0x%p) \"", (void *)str);
s = JSSTRING_CHARS(str);
for (i=0, n=JSSTRING_LENGTH(str); i < n; i++)
fputc(s[i], stderr);
fputc('"', stderr);
fputc('\n', stderr);
}
void printVal(JSContext *cx, jsval val);
void printObj(JSContext *cx, JSObject *jsobj) {
jsuint i;
jsval val;
JSClass *clasp;
fprintf(stderr, "object 0x%p\n", (void *)jsobj);
clasp = OBJ_GET_CLASS(cx, jsobj);
fprintf(stderr, "class 0x%p %s\n", (void *)clasp, clasp->name);
for (i=0; i < jsobj->map->nslots; i++) {
fprintf(stderr, "slot %3d ", i);
val = jsobj->slots[i];
if (JSVAL_IS_OBJECT(val))
fprintf(stderr, "object 0x%p\n", (void *)JSVAL_TO_OBJECT(val));
else
printVal(cx, val);
}
}
void printVal(JSContext *cx, jsval val) {
fprintf(stderr, "val %d (0x%p) = ", (int)val, (void *)val);
if (JSVAL_IS_NULL(val)) {
fprintf(stderr, "null\n");
} else if (JSVAL_IS_VOID(val)) {
fprintf(stderr, "undefined\n");
} else if (JSVAL_IS_OBJECT(val)) {
printObj(cx, JSVAL_TO_OBJECT(val));
} else if (JSVAL_IS_INT(val)) {
fprintf(stderr, "(int) %d\n", JSVAL_TO_INT(val));
} else if (JSVAL_IS_STRING(val)) {
printString(JSVAL_TO_STRING(val));
} else if (JSVAL_IS_DOUBLE(val)) {
fprintf(stderr, "(double) %g\n", *JSVAL_TO_DOUBLE(val));
} else {
JS_ASSERT(JSVAL_IS_BOOLEAN(val));
fprintf(stderr, "(boolean) %s\n",
JSVAL_TO_BOOLEAN(val) ? "true" : "false");
}
fflush(stderr);
}
void printId(JSContext *cx, jsid id) {
fprintf(stderr, "id %d (0x%p) is ", (int)id, (void *)id);
printVal(cx, ID_TO_VALUE(id));
}
void printAtom(JSAtom *atom) {
printString(ATOM_TO_STRING(atom));
}
#endif
Reference in New Issue View Git Blame Copy Permalink