https://github.com/mozilla/gecko-dev
Tip revision: 84b442cccbd02655d3e9665518b41c5183525851 authored by ffxbld on 18 May 2011, 01:40:03 UTC
Added tag FIREFOX_5_0b2_BUILD1 for changeset 40ea1355db3f. CLOSED TREE a=release
Added tag FIREFOX_5_0b2_BUILD1 for changeset 40ea1355db3f. CLOSED TREE a=release
Tip revision: 84b442c
jsobj.cpp
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sw=4 et tw=79:
*
* ***** 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 <stdlib.h>
#include <string.h>
#include "jstypes.h"
#include "jsstdint.h"
#include "jsarena.h"
#include "jsbit.h"
#include "jsutil.h"
#include "jshash.h"
#include "jsdhash.h"
#include "jsprf.h"
#include "jsapi.h"
#include "jsarray.h"
#include "jsatom.h"
#include "jsbool.h"
#include "jsbuiltins.h"
#include "jscntxt.h"
#include "jsversion.h"
#include "jsemit.h"
#include "jsfun.h"
#include "jsgc.h"
#include "jsinterp.h"
#include "jsiter.h"
#include "jslock.h"
#include "jsnum.h"
#include "jsobj.h"
#include "jsonparser.h"
#include "jsopcode.h"
#include "jsparse.h"
#include "jsproxy.h"
#include "jsscope.h"
#include "jsscript.h"
#include "jsstaticcheck.h"
#include "jsstdint.h"
#include "jsstr.h"
#include "jstracer.h"
#include "jsdbgapi.h"
#include "json.h"
#include "jswrapper.h"
#include "jsinterpinlines.h"
#include "jsscopeinlines.h"
#include "jsscriptinlines.h"
#include "jsobjinlines.h"
#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
#include "jsprobes.h"
#include "jsatominlines.h"
#include "jsobjinlines.h"
#include "jsscriptinlines.h"
#include "jsautooplen.h"
using namespace js;
using namespace js::gc;
JS_FRIEND_DATA(JSObjectMap) JSObjectMap::sharedNonNative(JSObjectMap::SHAPELESS);
Class js_ObjectClass = {
js_Object_str,
JSCLASS_HAS_CACHED_PROTO(JSProto_Object),
PropertyStub, /* addProperty */
PropertyStub, /* delProperty */
PropertyStub, /* getProperty */
StrictPropertyStub, /* setProperty */
EnumerateStub,
ResolveStub,
ConvertStub
};
JS_FRIEND_API(JSObject *)
js_ObjectToOuterObject(JSContext *cx, JSObject *obj)
{
OBJ_TO_OUTER_OBJECT(cx, obj);
return obj;
}
#if JS_HAS_OBJ_PROTO_PROP
static JSBool
obj_getProto(JSContext *cx, JSObject *obj, jsid id, Value *vp);
static JSBool
obj_setProto(JSContext *cx, JSObject *obj, jsid id, JSBool strict, Value *vp);
static JSPropertySpec object_props[] = {
{js_proto_str, 0, JSPROP_PERMANENT|JSPROP_SHARED, Jsvalify(obj_getProto), Jsvalify(obj_setProto)},
{0,0,0,0,0}
};
static JSBool
obj_getProto(JSContext *cx, JSObject *obj, jsid id, Value *vp)
{
/* Let CheckAccess get the slot's value, based on the access mode. */
uintN attrs;
id = ATOM_TO_JSID(cx->runtime->atomState.protoAtom);
return CheckAccess(cx, obj, id, JSACC_PROTO, vp, &attrs);
}
static JSBool
obj_setProto(JSContext *cx, JSObject *obj, jsid id, JSBool strict, Value *vp)
{
/* ECMAScript 5 8.6.2 forbids changing [[Prototype]] if not [[Extensible]]. */
if (!obj->isExtensible()) {
obj->reportNotExtensible(cx);
return false;
}
if (!vp->isObjectOrNull())
return JS_TRUE;
JSObject *pobj = vp->toObjectOrNull();
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;
}
uintN attrs;
id = ATOM_TO_JSID(cx->runtime->atomState.protoAtom);
if (!CheckAccess(cx, obj, id, JSAccessMode(JSACC_PROTO|JSACC_WRITE), vp, &attrs))
return JS_FALSE;
return SetProto(cx, obj, pobj, JS_TRUE);
}
#else /* !JS_HAS_OBJ_PROTO_PROP */
#define object_props NULL
#endif /* !JS_HAS_OBJ_PROTO_PROP */
static JSHashNumber
js_hash_object(const void *key)
{
return JSHashNumber(uintptr_t(key) >> JS_GCTHING_ALIGN);
}
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;
JSObject *obj2;
JSProperty *prop;
JS_CHECK_RECURSION(cx, return NULL);
map = &cx->sharpObjectMap;
JS_ASSERT(map->depth >= 1);
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, (void *) sharpid);
if (!he) {
JS_ReportOutOfMemory(cx);
return NULL;
}
ida = JS_Enumerate(cx, obj);
if (!ida)
return NULL;
ok = JS_TRUE;
for (i = 0, length = ida->length; i < length; i++) {
id = ida->vector[i];
ok = obj->lookupProperty(cx, id, &obj2, &prop);
if (!ok)
break;
if (!prop)
continue;
bool hasGetter, hasSetter;
AutoValueRooter v(cx);
AutoValueRooter setter(cx);
if (obj2->isNative()) {
const Shape *shape = (Shape *) prop;
hasGetter = shape->hasGetterValue();
hasSetter = shape->hasSetterValue();
if (hasGetter)
v.set(shape->getterValue());
if (hasSetter)
setter.set(shape->setterValue());
} else {
hasGetter = hasSetter = false;
}
if (hasSetter) {
/* Mark the getter, then set val to setter. */
if (hasGetter && v.value().isObject()) {
ok = !!MarkSharpObjects(cx, &v.value().toObject(), NULL);
if (!ok)
break;
}
v.set(setter.value());
} else if (!hasGetter) {
ok = obj->getProperty(cx, id, v.addr());
if (!ok)
break;
}
if (v.value().isObject() &&
!MarkSharpObjects(cx, &v.value().toObject(), NULL)) {
ok = JS_FALSE;
break;
}
}
if (!ok || !idap)
JS_DestroyIdArray(cx, ida);
if (!ok)
return NULL;
} else {
sharpid = uintptr_t(he->value);
if (sharpid == 0) {
sharpid = ++map->sharpgen << SHARP_ID_SHIFT;
he->value = (void *) sharpid;
}
ida = NULL;
}
if (idap)
*idap = ida;
return he;
}
JSHashEntry *
js_EnterSharpObject(JSContext *cx, JSObject *obj, JSIdArray **idap,
jschar **sp)
{
JSSharpObjectMap *map;
JSHashTable *table;
JSIdArray *ida;
JSHashNumber hash;
JSHashEntry *he, **hep;
jsatomid sharpid;
char buf[20];
size_t len;
if (!JS_CHECK_OPERATION_LIMIT(cx))
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) {
/*
* Although MarkSharpObjects tries to avoid invoking getters,
* it ends up doing so anyway under some circumstances; for
* example, if a wrapped object has getters, the wrapper will
* prevent MarkSharpObjects from recognizing them as such.
* This could lead to js_LeaveSharpObject being called while
* MarkSharpObjects is still working.
*
* Increment map->depth while we call MarkSharpObjects, to
* ensure that such a call doesn't free the hash table we're
* still using.
*/
++map->depth;
he = MarkSharpObjects(cx, obj, &ida);
--map->depth;
if (!he)
goto bad;
JS_ASSERT((uintptr_t(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 JSObject::getProperty() 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 = uintptr_t(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) {
cx->free_(*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;
}
}
}
static intN
gc_sharp_table_entry_marker(JSHashEntry *he, intN i, void *arg)
{
MarkObject((JSTracer *)arg, *(JSObject *)he->key, "sharp table entry");
return JS_DHASH_NEXT;
}
void
js_TraceSharpMap(JSTracer *trc, JSSharpObjectMap *map)
{
JS_ASSERT(map->depth > 0);
JS_ASSERT(map->table);
/*
* During recursive calls to MarkSharpObjects a non-native object or
* object with a custom getProperty method can potentially return an
* unrooted value or even cut from the object graph an argument of one of
* MarkSharpObjects recursive invocations. So we must protect map->table
* entries against GC.
*
* We can not simply use JSTempValueRooter to mark the obj argument of
* MarkSharpObjects during recursion as we have to protect *all* entries
* in JSSharpObjectMap including those that contains otherwise unreachable
* objects just allocated through custom getProperty. Otherwise newer
* allocations can re-use the address of an object stored in the hashtable
* confusing js_EnterSharpObject. So to address the problem we simply
* mark all objects from map->table.
*
* An alternative "proper" solution is to use JSTempValueRooter in
* MarkSharpObjects with code to remove during finalization entries
* with otherwise unreachable objects. But this is way too complex
* to justify spending efforts.
*/
JS_HashTableEnumerateEntries(map->table, gc_sharp_table_entry_marker, trc);
}
#if JS_HAS_TOSOURCE
static JSBool
obj_toSource(JSContext *cx, uintN argc, Value *vp)
{
JSBool ok;
JSHashEntry *he;
JSIdArray *ida;
jschar *chars, *ochars, *vsharp;
const jschar *idstrchars, *vchars;
size_t nchars, idstrlength, gsoplength, vlength, vsharplength, curlen;
const char *comma;
JSObject *obj2;
JSProperty *prop;
Value *val;
JSString *gsop[2];
JSString *valstr, *str;
JSLinearString *idstr;
JS_CHECK_RECURSION(cx, return JS_FALSE);
Value localroot[4];
PodArrayZero(localroot);
AutoArrayRooter tvr(cx, JS_ARRAY_LENGTH(localroot), localroot);
/* If outermost, we need parentheses to be an expression, not a block. */
JSBool outermost = (cx->sharpObjectMap.depth == 0);
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return false;
if (!(he = js_EnterSharpObject(cx, obj, &ida, &chars))) {
ok = JS_FALSE;
goto out;
}
if (IS_SHARP(he)) {
/*
* We didn't enter -- obj is already "sharp", meaning we've visited it
* already in our depth first search, and therefore chars contains a
* string of the form "#n#".
*/
JS_ASSERT(!ida);
#if JS_HAS_SHARP_VARS
nchars = js_strlen(chars);
#else
chars[0] = '{';
chars[1] = '}';
chars[2] = 0;
nchars = 2;
#endif
goto make_string;
}
JS_ASSERT(ida);
ok = JS_TRUE;
if (!chars) {
/* If outermost, allocate 4 + 1 for "({})" and the terminator. */
chars = (jschar *) cx->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 *)
cx->realloc_((ochars = chars), (nchars + 2 + 1) * sizeof(jschar));
if (!chars) {
Foreground::free_(ochars);
goto error;
}
if (outermost) {
/*
* No need for parentheses around the whole shebang, because #n=
* unambiguously begins an object initializer, and never a block
* statement.
*/
outermost = JS_FALSE;
}
}
chars[nchars++] = '{';
comma = NULL;
/*
* We have four local roots for cooked and raw value GC safety. Hoist the
* "localroot + 2" out of the loop using the val local, which refers to
* the raw (unconverted, "uncooked") values.
*/
val = localroot + 2;
for (jsint i = 0, length = ida->length; i < length; i++) {
/* Get strings for id and value and GC-root them via vp. */
jsid id = ida->vector[i];
ok = obj->lookupProperty(cx, id, &obj2, &prop);
if (!ok)
goto error;
/*
* Convert id to a value and then to a string. Decide early whether we
* prefer get/set or old getter/setter syntax.
*/
JSString *s = js_ValueToString(cx, IdToValue(id));
if (!s || !(idstr = s->ensureLinear(cx))) {
ok = JS_FALSE;
goto error;
}
vp->setString(idstr); /* local root */
jsint valcnt = 0;
if (prop) {
bool doGet = true;
if (obj2->isNative()) {
const Shape *shape = (Shape *) prop;
unsigned attrs = shape->attributes();
if (attrs & JSPROP_GETTER) {
doGet = false;
val[valcnt] = shape->getterValue();
gsop[valcnt] = cx->runtime->atomState.getAtom;
valcnt++;
}
if (attrs & JSPROP_SETTER) {
doGet = false;
val[valcnt] = shape->setterValue();
gsop[valcnt] = cx->runtime->atomState.setAtom;
valcnt++;
}
}
if (doGet) {
valcnt = 1;
gsop[0] = NULL;
ok = obj->getProperty(cx, id, &val[0]);
if (!ok)
goto error;
}
}
/*
* If id is a string that's not an identifier, or if it's a negative
* integer, then it must be quoted.
*/
bool idIsLexicalIdentifier = js_IsIdentifier(idstr);
if (JSID_IS_ATOM(id)
? !idIsLexicalIdentifier
: (!JSID_IS_INT(id) || JSID_TO_INT(id) < 0)) {
s = js_QuoteString(cx, idstr, jschar('\''));
if (!s || !(idstr = s->ensureLinear(cx))) {
ok = JS_FALSE;
goto error;
}
vp->setString(idstr); /* local root */
}
idstrlength = idstr->length();
idstrchars = idstr->getChars(cx);
if (!idstrchars) {
ok = JS_FALSE;
goto error;
}
for (jsint j = 0; j < valcnt; j++) {
/*
* Censor an accessor descriptor getter or setter part if it's
* undefined.
*/
if (gsop[j] && val[j].isUndefined())
continue;
/* Convert val[j] to its canonical source form. */
valstr = js_ValueToSource(cx, val[j]);
if (!valstr) {
ok = JS_FALSE;
goto error;
}
localroot[j].setString(valstr); /* local root */
vchars = valstr->getChars(cx);
if (!vchars) {
ok = JS_FALSE;
goto error;
}
vlength = valstr->length();
/*
* If val[j] is a non-sharp object, and we're not serializing an
* accessor (ECMA syntax can't accommodate sharpened accessors),
* consider sharpening it.
*/
vsharp = NULL;
vsharplength = 0;
#if JS_HAS_SHARP_VARS
if (!gsop[j] && val[j].isObject() && vchars[0] != '#') {
he = js_EnterSharpObject(cx, &val[j].toObject(), NULL, &vsharp);
if (!he) {
ok = JS_FALSE;
goto error;
}
if (IS_SHARP(he)) {
vchars = vsharp;
vlength = js_strlen(vchars);
} else {
if (vsharp) {
vsharplength = js_strlen(vsharp);
MAKE_SHARP(he);
}
js_LeaveSharpObject(cx, NULL);
}
}
#endif
/*
* 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] && IsFunctionObject(val[j])) {
const jschar *start = vchars;
const jschar *end = vchars + vlength;
uint8 parenChomp = 0;
if (vchars[0] == '(') {
vchars++;
parenChomp = 1;
}
/* Try to jump "function" keyword. */
if (vchars)
vchars = js_strchr_limit(vchars, ' ', end);
/*
* Jump over the function's name: it can't be encoded as part
* of an ECMA getter or setter.
*/
if (vchars)
vchars = js_strchr_limit(vchars, '(', end);
if (vchars) {
if (*vchars == ' ')
vchars++;
vlength = end - vchars - parenChomp;
} else {
gsop[j] = NULL;
vchars = start;
}
}
#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(gsop[j]->length() + 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 *) cx->realloc_((ochars = chars), curlen * sizeof(jschar));
if (!chars) {
chars = ochars;
goto overflow;
}
if (comma) {
chars[nchars++] = comma[0];
chars[nchars++] = comma[1];
}
comma = ", ";
if (gsop[j]) {
gsoplength = gsop[j]->length();
const jschar *gsopchars = gsop[j]->getChars(cx);
if (!gsopchars)
goto overflow;
js_strncpy(&chars[nchars], gsopchars, 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)
cx->free_(vsharp);
}
}
chars[nchars++] = '}';
if (outermost)
chars[nchars++] = ')';
chars[nchars] = 0;
error:
js_LeaveSharpObject(cx, &ida);
if (!ok) {
if (chars)
Foreground::free_(chars);
goto out;
}
if (!chars) {
JS_ReportOutOfMemory(cx);
ok = JS_FALSE;
goto out;
}
make_string:
str = js_NewString(cx, chars, nchars);
if (!str) {
cx->free_(chars);
ok = JS_FALSE;
goto out;
}
vp->setString(str);
ok = JS_TRUE;
out:
return ok;
overflow:
cx->free_(vsharp);
cx->free_(chars);
chars = NULL;
goto error;
}
#endif /* JS_HAS_TOSOURCE */
namespace js {
JSString *
obj_toStringHelper(JSContext *cx, JSObject *obj)
{
if (obj->isProxy())
return JSProxy::obj_toString(cx, obj);
const char *clazz = obj->getClass()->name;
size_t nchars = 9 + strlen(clazz); /* 9 for "[object ]" */
jschar *chars = (jschar *) cx->malloc_((nchars + 1) * sizeof(jschar));
if (!chars)
return NULL;
const char *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;
JSString *str = js_NewString(cx, chars, nchars);
if (!str)
cx->free_(chars);
return str;
}
}
/* ES5 15.2.4.2. Note steps 1 and 2 are errata. */
static JSBool
obj_toString(JSContext *cx, uintN argc, Value *vp)
{
Value &thisv = vp[1];
/* Step 1. */
if (thisv.isUndefined()) {
vp->setString(cx->runtime->atomState.objectUndefinedAtom);
return true;
}
/* Step 2. */
if (thisv.isNull()) {
vp->setString(cx->runtime->atomState.objectNullAtom);
return true;
}
/* Step 3. */
JSObject *obj = ToObject(cx, &thisv);
if (!obj)
return false;
/* Steps 4-5. */
JSString *str = js::obj_toStringHelper(cx, obj);
if (!str)
return false;
vp->setString(str);
return true;
}
static JSBool
obj_toLocaleString(JSContext *cx, uintN argc, Value *vp)
{
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return false;
JSString *str = js_ValueToString(cx, ObjectValue(*obj));
if (!str)
return JS_FALSE;
vp->setString(str);
return JS_TRUE;
}
static JSBool
obj_valueOf(JSContext *cx, uintN argc, Value *vp)
{
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return false;
vp->setObject(*obj);
return true;
}
/*
* Check if CSP allows new Function() or eval() to run in the current
* principals.
*/
JSBool
js_CheckContentSecurityPolicy(JSContext *cx, JSObject *scopeobj)
{
// CSP is static per document, so if our check said yes before, that
// answer is still valid.
JSObject *global = scopeobj->getGlobal();
Value v = global->getReservedSlot(JSRESERVED_GLOBAL_EVAL_ALLOWED);
if (v.isUndefined()) {
JSSecurityCallbacks *callbacks = JS_GetSecurityCallbacks(cx);
// if there are callbacks, make sure that the CSP callback is installed and
// that it permits eval().
v.setBoolean((!callbacks || !callbacks->contentSecurityPolicyAllows) ||
callbacks->contentSecurityPolicyAllows(cx));
// update the cache in the global object for the result of the security check
js_SetReservedSlot(cx, global, JSRESERVED_GLOBAL_EVAL_ALLOWED, v);
}
return !v.isFalse();
}
/*
* 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)
{
JSSecurityCallbacks *callbacks;
JSPrincipals *scopePrincipals;
callbacks = JS_GetSecurityCallbacks(cx);
if (callbacks && callbacks->findObjectPrincipals) {
scopePrincipals = callbacks->findObjectPrincipals(cx, scopeobj);
if (!principals || !scopePrincipals ||
!principals->subsume(principals, scopePrincipals)) {
JSAutoByteString callerstr;
if (!js_AtomToPrintableString(cx, caller, &callerstr))
return JS_FALSE;
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_BAD_INDIRECT_CALL, callerstr.ptr());
return JS_FALSE;
}
}
return JS_TRUE;
}
static bool
CheckScopeChainValidity(JSContext *cx, JSObject *scopeobj)
{
JSObject *inner = scopeobj;
OBJ_TO_INNER_OBJECT(cx, inner);
if (!inner)
return false;
JS_ASSERT(inner == scopeobj);
/* XXX This is an awful gross hack. */
while (scopeobj) {
JSObjectOp op = scopeobj->getClass()->ext.innerObject;
if (op && op(cx, scopeobj) != scopeobj) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_BAD_INDIRECT_CALL,
js_eval_str);
return false;
}
scopeobj = scopeobj->getParent();
}
return true;
}
const char *
js_ComputeFilename(JSContext *cx, JSStackFrame *caller,
JSPrincipals *principals, uintN *linenop)
{
jsbytecode *pc = caller->pc(cx);
if (pc && js_GetOpcode(cx, caller->script(), pc) == JSOP_EVAL) {
JS_ASSERT(js_GetOpcode(cx, caller->script(), pc + JSOP_EVAL_LENGTH) == JSOP_LINENO);
*linenop = GET_UINT16(pc + JSOP_EVAL_LENGTH);
} else {
*linenop = js_FramePCToLineNumber(cx, caller);
}
return caller->script()->filename;
}
#ifndef EVAL_CACHE_CHAIN_LIMIT
# define EVAL_CACHE_CHAIN_LIMIT 4
#endif
static inline JSScript **
EvalCacheHash(JSContext *cx, JSLinearString *str)
{
const jschar *s = str->chars();
size_t n = str->length();
if (n > 100)
n = 100;
uint32 h;
for (h = 0; n; s++, n--)
h = JS_ROTATE_LEFT32(h, 4) ^ *s;
h *= JS_GOLDEN_RATIO;
h >>= 32 - JS_EVAL_CACHE_SHIFT;
return &JS_SCRIPTS_TO_GC(cx)[h];
}
static JS_ALWAYS_INLINE JSScript *
EvalCacheLookup(JSContext *cx, JSLinearString *str, JSStackFrame *caller, uintN staticLevel,
JSPrincipals *principals, JSObject *scopeobj, JSScript **bucket)
{
/*
* Cache local eval scripts indexed by source qualified by scope.
*
* An eval cache entry should never be considered a hit unless its
* strictness matches that of the new eval code. The existing code takes
* care of this, because hits are qualified by the function from which
* eval was called, whose strictness doesn't change. (We don't cache evals
* in eval code, so the calling function corresponds to the calling script,
* and its strictness never varies.) Scripts produced by calls to eval from
* global code aren't cached.
*
* FIXME bug 620141: Qualify hits by calling script rather than function.
* Then we wouldn't need the unintuitive !isEvalFrame() hack in EvalKernel
* to avoid caching nested evals in functions (thus potentially mismatching
* on strict mode), and we could cache evals in global code if desired.
*/
uintN count = 0;
JSScript **scriptp = bucket;
EVAL_CACHE_METER(probe);
JSVersion version = cx->findVersion();
JSScript *script;
while ((script = *scriptp) != NULL) {
if (script->savedCallerFun &&
script->staticLevel == staticLevel &&
script->getVersion() == version &&
!script->hasSingletons &&
(script->principals == principals ||
(principals->subsume(principals, script->principals) &&
script->principals->subsume(script->principals, principals)))) {
/*
* Get the prior (cache-filling) eval's saved caller function.
* See Compiler::compileScript in jsparse.cpp.
*/
JSFunction *fun = script->getFunction(0);
if (fun == caller->fun()) {
/*
* Get the source string passed for safekeeping in the
* atom map by the prior eval to Compiler::compileScript.
*/
JSAtom *src = script->atomMap.vector[0];
if (src == str || EqualStrings(src, str)) {
/*
* Source matches, qualify by comparing scopeobj to the
* COMPILE_N_GO-memoized parent of the first literal
* function or regexp object if any. If none, then this
* script has no compiled-in dependencies on the prior
* eval's scopeobj.
*/
JSObjectArray *objarray = script->objects();
int i = 1;
if (objarray->length == 1) {
if (JSScript::isValidOffset(script->regexpsOffset)) {
objarray = script->regexps();
i = 0;
} else {
EVAL_CACHE_METER(noscope);
i = -1;
}
}
if (i < 0 ||
objarray->vector[i]->getParent() == scopeobj) {
JS_ASSERT(staticLevel == script->staticLevel);
EVAL_CACHE_METER(hit);
*scriptp = script->u.nextToGC;
script->u.nextToGC = NULL;
return script;
}
}
}
}
if (++count == EVAL_CACHE_CHAIN_LIMIT)
return NULL;
EVAL_CACHE_METER(step);
scriptp = &script->u.nextToGC;
}
return NULL;
}
/* ES5 15.1.2.1. */
static JSBool
eval(JSContext *cx, uintN argc, Value *vp)
{
/*
* NB: This method handles only indirect eval: direct eval is handled by
* JSOP_EVAL.
*/
JSStackFrame *caller = js_GetScriptedCaller(cx, NULL);
/* FIXME Bug 602994: This really should be perfectly cromulent. */
if (!caller) {
/* Eval code needs to inherit principals from the caller. */
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_BAD_INDIRECT_CALL, js_eval_str);
return false;
}
return EvalKernel(cx, argc, vp, INDIRECT_EVAL, caller, vp[0].toObject().getGlobal());
}
namespace js {
bool
EvalKernel(JSContext *cx, uintN argc, Value *vp, EvalType evalType, JSStackFrame *caller,
JSObject *scopeobj)
{
/*
* FIXME Bug 602994: Calls with no scripted caller should be permitted and
* should be implemented as indirect calls.
*/
JS_ASSERT(caller);
JS_ASSERT(scopeobj);
/*
* We once supported a second argument to eval to use as the scope chain
* when evaluating the code string. Warn when such uses are seen so that
* authors will know that support for eval(s, o) has been removed.
*/
JSScript *callerScript = caller->script();
if (argc > 1 && !callerScript->warnedAboutTwoArgumentEval) {
static const char TWO_ARGUMENT_WARNING[] =
"Support for eval(code, scopeObject) has been removed. "
"Use |with (scopeObject) eval(code);| instead.";
if (!JS_ReportWarning(cx, TWO_ARGUMENT_WARNING))
return false;
callerScript->warnedAboutTwoArgumentEval = true;
}
/*
* CSP check: Is eval() allowed at all?
* Report errors via CSP is done in the script security mgr.
*/
if (!js_CheckContentSecurityPolicy(cx, scopeobj)) {
JS_ReportError(cx, "call to eval() blocked by CSP");
return false;
}
/* ES5 15.1.2.1 step 1. */
if (argc < 1) {
vp->setUndefined();
return true;
}
if (!vp[2].isString()) {
*vp = vp[2];
return true;
}
JSString *str = vp[2].toString();
/* ES5 15.1.2.1 steps 2-8. */
JSObject *callee = JSVAL_TO_OBJECT(JS_CALLEE(cx, Jsvalify(vp)));
JS_ASSERT(IsAnyBuiltinEval(callee->getFunctionPrivate()));
JSPrincipals *principals = js_EvalFramePrincipals(cx, callee, caller);
/*
* Per ES5, indirect eval runs in the global scope. (eval is specified this
* way so that the compiler can make assumptions about what bindings may or
* may not exist in the current frame if it doesn't see 'eval'.)
*/
uintN staticLevel;
if (evalType == DIRECT_EVAL) {
staticLevel = caller->script()->staticLevel + 1;
#ifdef DEBUG
jsbytecode *callerPC = caller->pc(cx);
JS_ASSERT_IF(caller->isFunctionFrame(), caller->fun()->isHeavyweight());
JS_ASSERT(callerPC && js_GetOpcode(cx, caller->script(), callerPC) == JSOP_EVAL);
#endif
} else {
/* Pretend that we're top level. */
staticLevel = 0;
JS_ASSERT(scopeobj == scopeobj->getGlobal());
JS_ASSERT(scopeobj->isGlobal());
}
/* Ensure we compile this eval with the right object in the scope chain. */
if (!CheckScopeChainValidity(cx, scopeobj))
return false;
JSLinearString *linearStr = str->ensureLinear(cx);
if (!linearStr)
return false;
const jschar *chars = linearStr->chars();
size_t length = linearStr->length();
/*
* If the eval string starts with '(' and ends with ')', it may be JSON.
* Try the JSON parser first because it's much faster. If the eval string
* isn't JSON, JSON parsing will probably fail quickly, so little time
* will be lost.
*/
if (length > 2 && chars[0] == '(' && chars[length - 1] == ')') {
#if USE_OLD_AND_BUSTED_JSON_PARSER
JSONParser *jp = js_BeginJSONParse(cx, vp, /* suppressErrors = */true);
if (jp != NULL) {
/* Run JSON-parser on string inside ( and ). */
bool ok = js_ConsumeJSONText(cx, jp, chars + 1, length - 2);
ok &= js_FinishJSONParse(cx, jp, NullValue());
if (ok)
return true;
}
#else
JSONSourceParser parser(cx, chars + 1, length - 2, JSONSourceParser::StrictJSON,
JSONSourceParser::NoError);
if (!parser.parse(vp))
return false;
if (!vp->isUndefined())
return true;
#endif
}
/*
* Direct calls to eval are supposed to see the caller's |this|. If we
* haven't wrapped that yet, do so now, before we make a copy of it for
* the eval code to use.
*/
if (evalType == DIRECT_EVAL && !caller->computeThis(cx))
return false;
JSScript *script = NULL;
JSScript **bucket = EvalCacheHash(cx, linearStr);
if (evalType == DIRECT_EVAL && caller->isNonEvalFunctionFrame()) {
script = EvalCacheLookup(cx, linearStr, caller, staticLevel, principals, scopeobj, bucket);
/*
* Although the eval cache keeps a script alive from the perspective of
* the JS engine, from a jsdbgapi user's perspective each eval()
* creates and destroys a script. This hides implementation details and
* allows jsdbgapi clients to avoid calling JS_GetScriptObject after a
* script has been returned to the eval cache, which is invalid since
* script->u.object aliases script->u.nextToGC.
*/
if (script) {
js_CallNewScriptHook(cx, script, NULL);
MUST_FLOW_THROUGH("destroy");
}
}
/*
* We can't have a callerFrame (down in js::Execute's terms) if we're in
* global code (or if we're an indirect eval).
*/
JSStackFrame *callerFrame = (staticLevel != 0) ? caller : NULL;
if (!script) {
uintN lineno;
const char *filename = js_ComputeFilename(cx, caller, principals, &lineno);
uint32 tcflags = TCF_COMPILE_N_GO | TCF_NEED_MUTABLE_SCRIPT | TCF_COMPILE_FOR_EVAL;
script = Compiler::compileScript(cx, scopeobj, callerFrame,
principals, tcflags, chars, length,
filename, lineno, cx->findVersion(),
linearStr, staticLevel);
if (!script)
return false;
}
assertSameCompartment(cx, scopeobj, script);
/*
* Belt-and-braces: check that the lesser of eval's principals and the
* caller's principals has access to scopeobj.
*/
JSBool ok = js_CheckPrincipalsAccess(cx, scopeobj, principals,
cx->runtime->atomState.evalAtom) &&
Execute(cx, scopeobj, script, callerFrame, JSFRAME_EVAL, vp);
MUST_FLOW_LABEL(destroy);
js_CallDestroyScriptHook(cx, script);
script->u.nextToGC = *bucket;
*bucket = script;
#ifdef CHECK_SCRIPT_OWNER
script->owner = NULL;
#endif
return ok;
}
bool
IsBuiltinEvalForScope(JSObject *scopeChain, const Value &v)
{
JSObject *global = scopeChain->getGlobal();
JS_ASSERT((global->getClass()->flags & JSCLASS_GLOBAL_FLAGS) == JSCLASS_GLOBAL_FLAGS);
return global->getReservedSlot(JSRESERVED_GLOBAL_EVAL) == v;
}
bool
IsAnyBuiltinEval(JSFunction *fun)
{
return fun->maybeNative() == eval;
}
}
#if JS_HAS_OBJ_WATCHPOINT
static JSBool
obj_watch_handler(JSContext *cx, JSObject *obj, jsid id, jsval old,
jsval *nvp, void *closure)
{
JSObject *callable = (JSObject *) closure;
JSSecurityCallbacks *callbacks = JS_GetSecurityCallbacks(cx);
if (callbacks && callbacks->findObjectPrincipals) {
/* Skip over any obj_watch_* frames between us and the real subject. */
if (JSStackFrame *caller = js_GetScriptedCaller(cx, NULL)) {
/*
* Only call the watch handler if the watcher is allowed to watch
* the currently executing script.
*/
JSPrincipals *watcher = callbacks->findObjectPrincipals(cx, callable);
JSPrincipals *subject = js_StackFramePrincipals(cx, caller);
if (watcher && subject && !watcher->subsume(watcher, subject)) {
/* Silently don't call the watch handler. */
return true;
}
}
}
/* Avoid recursion on (obj, id) already being watched on cx. */
AutoResolving resolving(cx, obj, id, AutoResolving::WATCH);
if (resolving.alreadyStarted())
return true;
Value argv[] = { IdToValue(id), Valueify(old), Valueify(*nvp) };
return ExternalInvoke(cx, ObjectValue(*obj), ObjectOrNullValue(callable),
JS_ARRAY_LENGTH(argv), argv, Valueify(nvp));
}
static JSBool
obj_watch(JSContext *cx, uintN argc, Value *vp)
{
if (argc <= 1) {
js_ReportMissingArg(cx, *vp, 1);
return JS_FALSE;
}
JSObject *callable = js_ValueToCallableObject(cx, &vp[3], 0);
if (!callable)
return JS_FALSE;
/* Compute the unique int/atom symbol id needed by js_LookupProperty. */
jsid propid;
if (!ValueToId(cx, vp[2], &propid))
return JS_FALSE;
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return false;
Value tmp;
uintN attrs;
if (!CheckAccess(cx, obj, propid, JSACC_WATCH, &tmp, &attrs))
return JS_FALSE;
vp->setUndefined();
if (attrs & JSPROP_READONLY)
return JS_TRUE;
if (obj->isDenseArray() && !obj->makeDenseArraySlow(cx))
return JS_FALSE;
return JS_SetWatchPoint(cx, obj, propid, obj_watch_handler, callable);
}
static JSBool
obj_unwatch(JSContext *cx, uintN argc, Value *vp)
{
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return false;
vp->setUndefined();
jsid id;
if (argc != 0) {
if (!ValueToId(cx, vp[2], &id))
return JS_FALSE;
} else {
id = JSID_VOID;
}
return JS_ClearWatchPoint(cx, obj, id, NULL, NULL);
}
#endif /* JS_HAS_OBJ_WATCHPOINT */
/*
* Prototype and property query methods, to complement the 'in' and
* 'instanceof' operators.
*/
/* Proposed ECMA 15.2.4.5. */
static JSBool
obj_hasOwnProperty(JSContext *cx, uintN argc, Value *vp)
{
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return false;
return js_HasOwnPropertyHelper(cx, obj->getOps()->lookupProperty, argc, vp);
}
JSBool
js_HasOwnPropertyHelper(JSContext *cx, LookupPropOp lookup, uintN argc,
Value *vp)
{
jsid id;
if (!ValueToId(cx, argc != 0 ? vp[2] : UndefinedValue(), &id))
return JS_FALSE;
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return false;
JSObject *obj2;
JSProperty *prop;
if (obj->isProxy()) {
bool has;
if (!JSProxy::hasOwn(cx, obj, id, &has))
return false;
vp->setBoolean(has);
return true;
}
if (!js_HasOwnProperty(cx, lookup, obj, id, &obj2, &prop))
return JS_FALSE;
vp->setBoolean(!!prop);
return JS_TRUE;
}
JSBool
js_HasOwnProperty(JSContext *cx, LookupPropOp lookup, JSObject *obj, jsid id,
JSObject **objp, JSProperty **propp)
{
JSAutoResolveFlags rf(cx, JSRESOLVE_QUALIFIED | JSRESOLVE_DETECTING);
if (!(lookup ? lookup : js_LookupProperty)(cx, obj, id, objp, propp))
return false;
if (!*propp)
return true;
if (*objp == obj)
return true;
Class *clasp = (*objp)->getClass();
JSObject *outer = NULL;
if (JSObjectOp op = (*objp)->getClass()->ext.outerObject) {
outer = op(cx, *objp);
if (!outer)
return false;
}
if (outer != *objp) {
if ((*objp)->isNative() && obj->getClass() == 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.
*/
Shape *shape = reinterpret_cast<Shape *>(*propp);
if (shape->isSharedPermanent())
return true;
}
*propp = NULL;
}
return true;
}
/* ES5 15.2.4.6. */
static JSBool
obj_isPrototypeOf(JSContext *cx, uintN argc, Value *vp)
{
/* Step 1. */
if (argc < 1 || !vp[2].isObject()) {
vp->setBoolean(false);
return true;
}
/* Step 2. */
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return false;
/* Step 3. */
vp->setBoolean(js_IsDelegate(cx, obj, vp[2]));
return true;
}
/* ES5 15.2.4.7. */
static JSBool
obj_propertyIsEnumerable(JSContext *cx, uintN argc, Value *vp)
{
/* Step 1. */
jsid id;
if (!ValueToId(cx, argc != 0 ? vp[2] : UndefinedValue(), &id))
return false;
/* Step 2. */
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return false;
/* Steps 3-5. */
return js_PropertyIsEnumerable(cx, obj, id, vp);
}
JSBool
js_PropertyIsEnumerable(JSContext *cx, JSObject *obj, jsid id, Value *vp)
{
JSObject *pobj;
JSProperty *prop;
if (!obj->lookupProperty(cx, id, &pobj, &prop))
return JS_FALSE;
if (!prop) {
vp->setBoolean(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.
*/
bool shared;
uintN attrs;
if (pobj->isNative()) {
Shape *shape = (Shape *) prop;
shared = shape->isSharedPermanent();
attrs = shape->attributes();
} else {
shared = false;
if (!pobj->getAttributes(cx, id, &attrs))
return false;
}
if (pobj != obj && !shared) {
vp->setBoolean(false);
return true;
}
vp->setBoolean((attrs & JSPROP_ENUMERATE) != 0);
return true;
}
#if OLD_GETTER_SETTER_METHODS
const char js_defineGetter_str[] = "__defineGetter__";
const char js_defineSetter_str[] = "__defineSetter__";
const char js_lookupGetter_str[] = "__lookupGetter__";
const char js_lookupSetter_str[] = "__lookupSetter__";
JS_FRIEND_API(JSBool)
js_obj_defineGetter(JSContext *cx, uintN argc, Value *vp)
{
if (!BoxThisForVp(cx, vp))
return false;
JSObject *obj = &vp[1].toObject();
if (argc <= 1 || !js_IsCallable(vp[3])) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_BAD_GETTER_OR_SETTER,
js_getter_str);
return JS_FALSE;
}
PropertyOp getter = CastAsPropertyOp(&vp[3].toObject());
jsid id;
if (!ValueToId(cx, vp[2], &id))
return JS_FALSE;
if (!CheckRedeclaration(cx, obj, id, JSPROP_GETTER))
return JS_FALSE;
/*
* Getters and setters are just like watchpoints from an access
* control point of view.
*/
Value junk;
uintN attrs;
if (!CheckAccess(cx, obj, id, JSACC_WATCH, &junk, &attrs))
return JS_FALSE;
vp->setUndefined();
return obj->defineProperty(cx, id, UndefinedValue(), getter, StrictPropertyStub,
JSPROP_ENUMERATE | JSPROP_GETTER | JSPROP_SHARED);
}
JS_FRIEND_API(JSBool)
js_obj_defineSetter(JSContext *cx, uintN argc, Value *vp)
{
if (!BoxThisForVp(cx, vp))
return false;
JSObject *obj = &vp[1].toObject();
if (argc <= 1 || !js_IsCallable(vp[3])) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_BAD_GETTER_OR_SETTER,
js_setter_str);
return JS_FALSE;
}
StrictPropertyOp setter = CastAsStrictPropertyOp(&vp[3].toObject());
jsid id;
if (!ValueToId(cx, vp[2], &id))
return JS_FALSE;
if (!CheckRedeclaration(cx, obj, id, JSPROP_SETTER))
return JS_FALSE;
/*
* Getters and setters are just like watchpoints from an access
* control point of view.
*/
Value junk;
uintN attrs;
if (!CheckAccess(cx, obj, id, JSACC_WATCH, &junk, &attrs))
return JS_FALSE;
vp->setUndefined();
return obj->defineProperty(cx, id, UndefinedValue(), PropertyStub, setter,
JSPROP_ENUMERATE | JSPROP_SETTER | JSPROP_SHARED);
}
static JSBool
obj_lookupGetter(JSContext *cx, uintN argc, Value *vp)
{
jsid id;
if (!ValueToId(cx, argc != 0 ? vp[2] : UndefinedValue(), &id))
return JS_FALSE;
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return JS_FALSE;
JSObject *pobj;
JSProperty *prop;
if (!obj->lookupProperty(cx, id, &pobj, &prop))
return JS_FALSE;
vp->setUndefined();
if (prop) {
if (pobj->isNative()) {
Shape *shape = (Shape *) prop;
if (shape->hasGetterValue())
*vp = shape->getterValue();
}
}
return JS_TRUE;
}
static JSBool
obj_lookupSetter(JSContext *cx, uintN argc, Value *vp)
{
jsid id;
if (!ValueToId(cx, argc != 0 ? vp[2] : UndefinedValue(), &id))
return JS_FALSE;
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return JS_FALSE;
JSObject *pobj;
JSProperty *prop;
if (!obj->lookupProperty(cx, id, &pobj, &prop))
return JS_FALSE;
vp->setUndefined();
if (prop) {
if (pobj->isNative()) {
Shape *shape = (Shape *) prop;
if (shape->hasSetterValue())
*vp = shape->setterValue();
}
}
return JS_TRUE;
}
#endif /* OLD_GETTER_SETTER_METHODS */
JSBool
obj_getPrototypeOf(JSContext *cx, uintN argc, Value *vp)
{
if (argc == 0) {
js_ReportMissingArg(cx, *vp, 0);
return JS_FALSE;
}
if (vp[2].isPrimitive()) {
char *bytes = DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, vp[2], NULL);
if (!bytes)
return JS_FALSE;
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_UNEXPECTED_TYPE, bytes, "not an object");
JS_free(cx, bytes);
return JS_FALSE;
}
JSObject *obj = &vp[2].toObject();
uintN attrs;
return CheckAccess(cx, obj, ATOM_TO_JSID(cx->runtime->atomState.protoAtom),
JSACC_PROTO, vp, &attrs);
}
extern JSBool
js_NewPropertyDescriptorObject(JSContext *cx, jsid id, uintN attrs,
const Value &getter, const Value &setter,
const Value &value, Value *vp)
{
/* We have our own property, so start creating the descriptor. */
JSObject *desc = NewBuiltinClassInstance(cx, &js_ObjectClass);
if (!desc)
return false;
vp->setObject(*desc); /* Root and return. */
const JSAtomState &atomState = cx->runtime->atomState;
if (attrs & (JSPROP_GETTER | JSPROP_SETTER)) {
if (!desc->defineProperty(cx, ATOM_TO_JSID(atomState.getAtom), getter,
PropertyStub, StrictPropertyStub, JSPROP_ENUMERATE) ||
!desc->defineProperty(cx, ATOM_TO_JSID(atomState.setAtom), setter,
PropertyStub, StrictPropertyStub, JSPROP_ENUMERATE)) {
return false;
}
} else {
if (!desc->defineProperty(cx, ATOM_TO_JSID(atomState.valueAtom), value,
PropertyStub, StrictPropertyStub, JSPROP_ENUMERATE) ||
!desc->defineProperty(cx, ATOM_TO_JSID(atomState.writableAtom),
BooleanValue((attrs & JSPROP_READONLY) == 0),
PropertyStub, StrictPropertyStub, JSPROP_ENUMERATE)) {
return false;
}
}
return desc->defineProperty(cx, ATOM_TO_JSID(atomState.enumerableAtom),
BooleanValue((attrs & JSPROP_ENUMERATE) != 0),
PropertyStub, StrictPropertyStub, JSPROP_ENUMERATE) &&
desc->defineProperty(cx, ATOM_TO_JSID(atomState.configurableAtom),
BooleanValue((attrs & JSPROP_PERMANENT) == 0),
PropertyStub, StrictPropertyStub, JSPROP_ENUMERATE);
}
JSBool
js_GetOwnPropertyDescriptor(JSContext *cx, JSObject *obj, jsid id, Value *vp)
{
if (obj->isProxy())
return JSProxy::getOwnPropertyDescriptor(cx, obj, id, false, vp);
JSObject *pobj;
JSProperty *prop;
if (!js_HasOwnProperty(cx, obj->getOps()->lookupProperty, obj, id, &pobj, &prop))
return false;
if (!prop) {
vp->setUndefined();
return true;
}
Value roots[] = { UndefinedValue(), UndefinedValue(), UndefinedValue() };
AutoArrayRooter tvr(cx, JS_ARRAY_LENGTH(roots), roots);
unsigned attrs;
bool doGet = true;
if (pobj->isNative()) {
Shape *shape = (Shape *) prop;
attrs = shape->attributes();
if (attrs & (JSPROP_GETTER | JSPROP_SETTER)) {
doGet = false;
if (attrs & JSPROP_GETTER)
roots[0] = shape->getterValue();
if (attrs & JSPROP_SETTER)
roots[1] = shape->setterValue();
}
} else {
if (!pobj->getAttributes(cx, id, &attrs))
return false;
}
if (doGet && !obj->getProperty(cx, id, &roots[2]))
return false;
return js_NewPropertyDescriptorObject(cx, id,
attrs,
roots[0], /* getter */
roots[1], /* setter */
roots[2], /* value */
vp);
}
static bool
GetFirstArgumentAsObject(JSContext *cx, uintN argc, Value *vp, const char *method, JSObject **objp)
{
if (argc == 0) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_MORE_ARGS_NEEDED,
method, "0", "s");
return false;
}
const Value &v = vp[2];
if (!v.isObject()) {
char *bytes = DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, v, NULL);
if (!bytes)
return false;
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_UNEXPECTED_TYPE,
bytes, "not an object");
JS_free(cx, bytes);
return false;
}
*objp = &v.toObject();
return true;
}
static JSBool
obj_getOwnPropertyDescriptor(JSContext *cx, uintN argc, Value *vp)
{
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.getOwnPropertyDescriptor", &obj))
return JS_FALSE;
AutoIdRooter nameidr(cx);
if (!ValueToId(cx, argc >= 2 ? vp[3] : UndefinedValue(), nameidr.addr()))
return JS_FALSE;
return js_GetOwnPropertyDescriptor(cx, obj, nameidr.id(), vp);
}
static JSBool
obj_keys(JSContext *cx, uintN argc, Value *vp)
{
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.keys", &obj))
return false;
AutoIdVector props(cx);
if (!GetPropertyNames(cx, obj, JSITER_OWNONLY, &props))
return false;
AutoValueVector vals(cx);
if (!vals.reserve(props.length()))
return false;
for (size_t i = 0, len = props.length(); i < len; i++) {
jsid id = props[i];
if (JSID_IS_STRING(id)) {
JS_ALWAYS_TRUE(vals.append(StringValue(JSID_TO_STRING(id))));
} else if (JSID_IS_INT(id)) {
JSString *str = js_IntToString(cx, JSID_TO_INT(id));
if (!str)
return false;
vals.infallibleAppend(StringValue(str));
} else {
JS_ASSERT(JSID_IS_OBJECT(id));
}
}
JS_ASSERT(props.length() <= UINT32_MAX);
JSObject *aobj = NewDenseCopiedArray(cx, jsuint(vals.length()), vals.begin());
if (!aobj)
return false;
vp->setObject(*aobj);
return true;
}
static bool
HasProperty(JSContext* cx, JSObject* obj, jsid id, Value* vp, bool *foundp)
{
if (!obj->hasProperty(cx, id, foundp, JSRESOLVE_QUALIFIED | JSRESOLVE_DETECTING))
return false;
if (!*foundp) {
vp->setUndefined();
return true;
}
/*
* We must go through the method read barrier in case id is 'get' or 'set'.
* There is no obvious way to defer cloning a joined function object whose
* identity will be used by DefinePropertyOnObject, e.g., or reflected via
* js_GetOwnPropertyDescriptor, as the getter or setter callable object.
*/
return !!obj->getProperty(cx, id, vp);
}
PropDesc::PropDesc()
: pd(UndefinedValue()),
value(UndefinedValue()),
get(UndefinedValue()),
set(UndefinedValue()),
attrs(0),
hasGet(false),
hasSet(false),
hasValue(false),
hasWritable(false),
hasEnumerable(false),
hasConfigurable(false)
{
}
bool
PropDesc::initialize(JSContext* cx, const Value &origval)
{
Value v = origval;
/* 8.10.5 step 1 */
if (v.isPrimitive()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_NOT_NONNULL_OBJECT);
return false;
}
JSObject* desc = &v.toObject();
/* Make a copy of the descriptor. We might need it later. */
pd = v;
/* Start with the proper defaults. */
attrs = JSPROP_PERMANENT | JSPROP_READONLY;
bool found;
/* 8.10.5 step 3 */
#ifdef __GNUC__ /* quell GCC overwarning */
found = false;
#endif
if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.enumerableAtom), &v, &found))
return false;
if (found) {
hasEnumerable = JS_TRUE;
if (js_ValueToBoolean(v))
attrs |= JSPROP_ENUMERATE;
}
/* 8.10.5 step 4 */
if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.configurableAtom), &v, &found))
return false;
if (found) {
hasConfigurable = JS_TRUE;
if (js_ValueToBoolean(v))
attrs &= ~JSPROP_PERMANENT;
}
/* 8.10.5 step 5 */
if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.valueAtom), &v, &found))
return false;
if (found) {
hasValue = true;
value = v;
}
/* 8.10.6 step 6 */
if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.writableAtom), &v, &found))
return false;
if (found) {
hasWritable = JS_TRUE;
if (js_ValueToBoolean(v))
attrs &= ~JSPROP_READONLY;
}
/* 8.10.7 step 7 */
if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.getAtom), &v, &found))
return false;
if (found) {
if ((v.isPrimitive() || !js_IsCallable(v)) && !v.isUndefined()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_BAD_GET_SET_FIELD,
js_getter_str);
return false;
}
hasGet = true;
get = v;
attrs |= JSPROP_GETTER | JSPROP_SHARED;
}
/* 8.10.7 step 8 */
if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.setAtom), &v, &found))
return false;
if (found) {
if ((v.isPrimitive() || !js_IsCallable(v)) && !v.isUndefined()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_BAD_GET_SET_FIELD,
js_setter_str);
return false;
}
hasSet = true;
set = v;
attrs |= JSPROP_SETTER | JSPROP_SHARED;
}
/* 8.10.7 step 9 */
if ((hasGet || hasSet) && (hasValue || hasWritable)) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_INVALID_DESCRIPTOR);
return false;
}
return true;
}
static JSBool
Reject(JSContext *cx, uintN errorNumber, bool throwError, jsid id, bool *rval)
{
if (throwError) {
jsid idstr;
if (!js_ValueToStringId(cx, IdToValue(id), &idstr))
return JS_FALSE;
JSAutoByteString bytes(cx, JSID_TO_STRING(idstr));
if (!bytes)
return JS_FALSE;
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, errorNumber, bytes.ptr());
return JS_FALSE;
}
*rval = false;
return JS_TRUE;
}
static JSBool
Reject(JSContext *cx, JSObject *obj, uintN errorNumber, bool throwError, bool *rval)
{
if (throwError) {
if (js_ErrorFormatString[errorNumber].argCount == 1) {
js_ReportValueErrorFlags(cx, JSREPORT_ERROR, errorNumber,
JSDVG_IGNORE_STACK, ObjectValue(*obj),
NULL, NULL, NULL);
} else {
JS_ASSERT(js_ErrorFormatString[errorNumber].argCount == 0);
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, errorNumber);
}
return JS_FALSE;
}
*rval = false;
return JS_TRUE;
}
static JSBool
DefinePropertyOnObject(JSContext *cx, JSObject *obj, const jsid &id, const PropDesc &desc,
bool throwError, bool *rval)
{
/* 8.12.9 step 1. */
JSProperty *current;
JSObject *obj2;
JS_ASSERT(!obj->getOps()->lookupProperty);
if (!js_HasOwnProperty(cx, NULL, obj, id, &obj2, ¤t))
return JS_FALSE;
JS_ASSERT(!obj->getOps()->defineProperty);
/*
* If we find a shared permanent property in a different object obj2 from
* obj, then if the property is shared permanent (an old hack to optimize
* per-object properties into one prototype property), ignore that lookup
* result (null current).
*
* FIXME: bug 575997 (see also bug 607863).
*/
if (current && obj2 != obj && obj2->isNative()) {
/* See same assertion with comment further below. */
JS_ASSERT(obj2->getClass() == obj->getClass());
Shape *shape = (Shape *) current;
if (shape->isSharedPermanent())
current = NULL;
}
/* 8.12.9 steps 2-4. */
if (!current) {
if (!obj->isExtensible())
return Reject(cx, obj, JSMSG_OBJECT_NOT_EXTENSIBLE, throwError, rval);
*rval = true;
if (desc.isGenericDescriptor() || desc.isDataDescriptor()) {
JS_ASSERT(!obj->getOps()->defineProperty);
return js_DefineProperty(cx, obj, id, &desc.value,
PropertyStub, StrictPropertyStub, desc.attrs);
}
JS_ASSERT(desc.isAccessorDescriptor());
/*
* Getters and setters are just like watchpoints from an access
* control point of view.
*/
Value dummy;
uintN dummyAttrs;
if (!CheckAccess(cx, obj, id, JSACC_WATCH, &dummy, &dummyAttrs))
return JS_FALSE;
Value tmp = UndefinedValue();
return js_DefineProperty(cx, obj, id, &tmp,
desc.getter(), desc.setter(), desc.attrs);
}
/* 8.12.9 steps 5-6 (note 5 is merely a special case of 6). */
Value v = UndefinedValue();
/*
* In the special case of shared permanent properties, the "own" property
* can be found on a different object. In that case the returned property
* might not be native, except: the shared permanent property optimization
* is not applied if the objects have different classes (bug 320854), as
* must be enforced by js_HasOwnProperty for the Shape cast below to be
* safe.
*/
JS_ASSERT(obj->getClass() == obj2->getClass());
const Shape *shape = reinterpret_cast<Shape *>(current);
do {
if (desc.isAccessorDescriptor()) {
if (!shape->isAccessorDescriptor())
break;
if (desc.hasGet) {
JSBool same;
if (!SameValue(cx, desc.getterValue(), shape->getterOrUndefined(), &same))
return JS_FALSE;
if (!same)
break;
}
if (desc.hasSet) {
JSBool same;
if (!SameValue(cx, desc.setterValue(), shape->setterOrUndefined(), &same))
return JS_FALSE;
if (!same)
break;
}
} else {
/*
* Determine the current value of the property once, if the current
* value might actually need to be used or preserved later. NB: we
* guard on whether the current property is a data descriptor to
* avoid calling a getter; we won't need the value if it's not a
* data descriptor.
*/
if (shape->isDataDescriptor()) {
/*
* We must rule out a non-configurable js::PropertyOp-guarded
* property becoming a writable unguarded data property, since
* such a property can have its value changed to one the getter
* and setter preclude.
*
* A desc lacking writable but with value is a data descriptor
* and we must reject it as if it had writable: true if current
* is writable.
*/
if (!shape->configurable() &&
(!shape->hasDefaultGetter() || !shape->hasDefaultSetter()) &&
desc.isDataDescriptor() &&
(desc.hasWritable ? desc.writable() : shape->writable()))
{
return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, id, rval);
}
if (!js_NativeGet(cx, obj, obj2, shape, JSGET_NO_METHOD_BARRIER, &v))
return JS_FALSE;
}
if (desc.isDataDescriptor()) {
if (!shape->isDataDescriptor())
break;
JSBool same;
if (desc.hasValue) {
if (!SameValue(cx, desc.value, v, &same))
return JS_FALSE;
if (!same) {
/*
* Insist that a non-configurable js::PropertyOp data
* property is frozen at exactly the last-got value.
*
* Duplicate the first part of the big conjunction that
* we tested above, rather than add a local bool flag.
* Likewise, don't try to keep shape->writable() in a
* flag we veto from true to false for non-configurable
* PropertyOp-based data properties and test before the
* SameValue check later on in order to re-use that "if
* (!SameValue) Reject" logic.
*
* This function is large and complex enough that it
* seems best to repeat a small bit of code and return
* Reject(...) ASAP, instead of being clever.
*/
if (!shape->configurable() &&
(!shape->hasDefaultGetter() || !shape->hasDefaultSetter()))
{
return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, id, rval);
}
break;
}
}
if (desc.hasWritable && desc.writable() != shape->writable())
break;
} else {
/* The only fields in desc will be handled below. */
JS_ASSERT(desc.isGenericDescriptor());
}
}
if (desc.hasConfigurable && desc.configurable() != shape->configurable())
break;
if (desc.hasEnumerable && desc.enumerable() != shape->enumerable())
break;
/* The conditions imposed by step 5 or step 6 apply. */
*rval = true;
return JS_TRUE;
} while (0);
/* 8.12.9 step 7. */
if (!shape->configurable()) {
/*
* Since [[Configurable]] defaults to false, we don't need to check
* whether it was specified. We can't do likewise for [[Enumerable]]
* because its putative value is used in a comparison -- a comparison
* whose result must always be false per spec if the [[Enumerable]]
* field is not present. Perfectly pellucid logic, eh?
*/
JS_ASSERT_IF(!desc.hasConfigurable, !desc.configurable());
if (desc.configurable() ||
(desc.hasEnumerable && desc.enumerable() != shape->enumerable())) {
return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, id, rval);
}
}
bool callDelProperty = false;
if (desc.isGenericDescriptor()) {
/* 8.12.9 step 8, no validation required */
} else if (desc.isDataDescriptor() != shape->isDataDescriptor()) {
/* 8.12.9 step 9. */
if (!shape->configurable())
return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, id, rval);
} else if (desc.isDataDescriptor()) {
/* 8.12.9 step 10. */
JS_ASSERT(shape->isDataDescriptor());
if (!shape->configurable() && !shape->writable()) {
if (desc.hasWritable && desc.writable())
return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, id, rval);
if (desc.hasValue) {
JSBool same;
if (!SameValue(cx, desc.value, v, &same))
return JS_FALSE;
if (!same)
return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, id, rval);
}
}
callDelProperty = !shape->hasDefaultGetter() || !shape->hasDefaultSetter();
} else {
/* 8.12.9 step 11. */
JS_ASSERT(desc.isAccessorDescriptor() && shape->isAccessorDescriptor());
if (!shape->configurable()) {
if (desc.hasSet) {
JSBool same;
if (!SameValue(cx, desc.setterValue(), shape->setterOrUndefined(), &same))
return JS_FALSE;
if (!same)
return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, id, rval);
}
if (desc.hasGet) {
JSBool same;
if (!SameValue(cx, desc.getterValue(), shape->getterOrUndefined(), &same))
return JS_FALSE;
if (!same)
return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, id, rval);
}
}
}
/* 8.12.9 step 12. */
uintN attrs;
PropertyOp getter;
StrictPropertyOp setter;
if (desc.isGenericDescriptor()) {
uintN changed = 0;
if (desc.hasConfigurable)
changed |= JSPROP_PERMANENT;
if (desc.hasEnumerable)
changed |= JSPROP_ENUMERATE;
attrs = (shape->attributes() & ~changed) | (desc.attrs & changed);
if (shape->isMethod()) {
JS_ASSERT(!(attrs & (JSPROP_GETTER | JSPROP_SETTER)));
getter = PropertyStub;
setter = StrictPropertyStub;
} else {
getter = shape->getter();
setter = shape->setter();
}
} else if (desc.isDataDescriptor()) {
uintN unchanged = 0;
if (!desc.hasConfigurable)
unchanged |= JSPROP_PERMANENT;
if (!desc.hasEnumerable)
unchanged |= JSPROP_ENUMERATE;
if (!desc.hasWritable)
unchanged |= JSPROP_READONLY;
if (desc.hasValue)
v = desc.value;
attrs = (desc.attrs & ~unchanged) | (shape->attributes() & unchanged);
getter = PropertyStub;
setter = StrictPropertyStub;
} else {
JS_ASSERT(desc.isAccessorDescriptor());
/*
* Getters and setters are just like watchpoints from an access
* control point of view.
*/
Value dummy;
if (!CheckAccess(cx, obj2, id, JSACC_WATCH, &dummy, &attrs))
return JS_FALSE;
JS_ASSERT_IF(shape->isMethod(), !(attrs & (JSPROP_GETTER | JSPROP_SETTER)));
/* 8.12.9 step 12. */
uintN changed = 0;
if (desc.hasConfigurable)
changed |= JSPROP_PERMANENT;
if (desc.hasEnumerable)
changed |= JSPROP_ENUMERATE;
if (desc.hasGet)
changed |= JSPROP_GETTER | JSPROP_SHARED;
if (desc.hasSet)
changed |= JSPROP_SETTER | JSPROP_SHARED;
attrs = (desc.attrs & changed) | (shape->attributes() & ~changed);
if (desc.hasGet) {
getter = desc.getter();
} else {
getter = (shape->isMethod() || (shape->hasDefaultGetter() && !shape->hasGetterValue()))
? PropertyStub
: shape->getter();
}
if (desc.hasSet) {
setter = desc.setter();
} else {
setter = (shape->hasDefaultSetter() && !shape->hasSetterValue())
? StrictPropertyStub
: shape->setter();
}
}
*rval = true;
/*
* Since "data" properties implemented using native C functions may rely on
* side effects during setting, we must make them aware that they have been
* "assigned"; deleting the property before redefining it does the trick.
* See bug 539766, where we ran into problems when we redefined
* arguments.length without making the property aware that its value had
* been changed (which would have happened if we had deleted it before
* redefining it or we had invoked its setter to change its value).
*/
if (callDelProperty) {
Value dummy = UndefinedValue();
if (!CallJSPropertyOp(cx, obj2->getClass()->delProperty, obj2, id, &dummy))
return false;
}
return js_DefineProperty(cx, obj, id, &v, getter, setter, attrs);
}
static JSBool
DefinePropertyOnArray(JSContext *cx, JSObject *obj, const jsid &id, const PropDesc &desc,
bool throwError, bool *rval)
{
/*
* We probably should optimize dense array property definitions where
* the descriptor describes a traditional array property (enumerable,
* configurable, writable, numeric index or length without altering its
* attributes). Such definitions are probably unlikely, so we don't bother
* for now.
*/
if (obj->isDenseArray() && !obj->makeDenseArraySlow(cx))
return JS_FALSE;
jsuint oldLen = obj->getArrayLength();
if (JSID_IS_ATOM(id, cx->runtime->atomState.lengthAtom)) {
/*
* Our optimization of storage of the length property of arrays makes
* it very difficult to properly implement defining the property. For
* now simply throw an exception (NB: not merely Reject) on any attempt
* to define the "length" property, rather than attempting to implement
* some difficult-for-authors-to-grasp subset of that functionality.
*/
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CANT_DEFINE_ARRAY_LENGTH);
return JS_FALSE;
}
uint32 index;
if (js_IdIsIndex(id, &index)) {
/*
// Disabled until we support defining "length":
if (index >= oldLen && lengthPropertyNotWritable())
return ThrowTypeError(cx, JSMSG_CANT_APPEND_TO_ARRAY);
*/
if (!DefinePropertyOnObject(cx, obj, id, desc, false, rval))
return JS_FALSE;
if (!*rval)
return Reject(cx, obj, JSMSG_CANT_DEFINE_ARRAY_INDEX, throwError, rval);
if (index >= oldLen) {
JS_ASSERT(index != UINT32_MAX);
obj->setArrayLength(index + 1);
}
*rval = true;
return JS_TRUE;
}
return DefinePropertyOnObject(cx, obj, id, desc, throwError, rval);
}
static JSBool
DefineProperty(JSContext *cx, JSObject *obj, const jsid &id, const PropDesc &desc, bool throwError,
bool *rval)
{
if (obj->isArray())
return DefinePropertyOnArray(cx, obj, id, desc, throwError, rval);
if (obj->getOps()->lookupProperty) {
if (obj->isProxy())
return JSProxy::defineProperty(cx, obj, id, desc.pd);
return Reject(cx, obj, JSMSG_OBJECT_NOT_EXTENSIBLE, throwError, rval);
}
return DefinePropertyOnObject(cx, obj, id, desc, throwError, rval);
}
JSBool
js_DefineOwnProperty(JSContext *cx, JSObject *obj, jsid id, const Value &descriptor, JSBool *bp)
{
AutoPropDescArrayRooter descs(cx);
PropDesc *desc = descs.append();
if (!desc || !desc->initialize(cx, descriptor))
return false;
bool rval;
if (!DefineProperty(cx, obj, id, *desc, true, &rval))
return false;
*bp = !!rval;
return true;
}
/* ES5 15.2.3.6: Object.defineProperty(O, P, Attributes) */
static JSBool
obj_defineProperty(JSContext* cx, uintN argc, Value* vp)
{
/* 15.2.3.6 steps 1 and 5. */
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.defineProperty", &obj))
return JS_FALSE;
vp->setObject(*obj);
/* 15.2.3.6 step 2. */
AutoIdRooter nameidr(cx);
if (!ValueToId(cx, argc >= 2 ? vp[3] : UndefinedValue(), nameidr.addr()))
return JS_FALSE;
/* 15.2.3.6 step 3. */
const Value &descval = argc >= 3 ? vp[4] : UndefinedValue();
/* 15.2.3.6 step 4 */
JSBool junk;
return js_DefineOwnProperty(cx, obj, nameidr.id(), descval, &junk);
}
static bool
DefineProperties(JSContext *cx, JSObject *obj, JSObject *props)
{
AutoIdVector ids(cx);
if (!GetPropertyNames(cx, props, JSITER_OWNONLY, &ids))
return false;
AutoPropDescArrayRooter descs(cx);
size_t len = ids.length();
for (size_t i = 0; i < len; i++) {
jsid id = ids[i];
PropDesc* desc = descs.append();
Value v;
if (!desc || !props->getProperty(cx, id, &v) || !desc->initialize(cx, v))
return false;
}
bool dummy;
for (size_t i = 0; i < len; i++) {
if (!DefineProperty(cx, obj, ids[i], descs[i], true, &dummy))
return false;
}
return true;
}
extern JSBool
js_PopulateObject(JSContext *cx, JSObject *newborn, JSObject *props)
{
return DefineProperties(cx, newborn, props);
}
/* ES5 15.2.3.7: Object.defineProperties(O, Properties) */
static JSBool
obj_defineProperties(JSContext* cx, uintN argc, Value* vp)
{
/* Steps 1 and 7. */
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.defineProperties", &obj))
return false;
vp->setObject(*obj);
/* Step 2. */
if (argc < 2) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_MORE_ARGS_NEEDED,
"Object.defineProperties", "0", "s");
return false;
}
JSObject* props = ToObject(cx, &vp[3]);
if (!props)
return false;
/* Steps 3-6. */
return DefineProperties(cx, obj, props);
}
/* ES5 15.2.3.5: Object.create(O [, Properties]) */
static JSBool
obj_create(JSContext *cx, uintN argc, Value *vp)
{
if (argc == 0) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_MORE_ARGS_NEEDED,
"Object.create", "0", "s");
return JS_FALSE;
}
const Value &v = vp[2];
if (!v.isObjectOrNull()) {
char *bytes = DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, v, NULL);
if (!bytes)
return JS_FALSE;
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_UNEXPECTED_TYPE,
bytes, "not an object or null");
JS_free(cx, bytes);
return JS_FALSE;
}
/*
* Use the callee's global as the parent of the new object to avoid dynamic
* scoping (i.e., using the caller's global).
*/
JSObject *obj = NewNonFunction<WithProto::Given>(cx, &js_ObjectClass, v.toObjectOrNull(),
vp->toObject().getGlobal());
if (!obj)
return JS_FALSE;
vp->setObject(*obj); /* Root and prepare for eventual return. */
/* 15.2.3.5 step 4. */
if (argc > 1 && !vp[3].isUndefined()) {
if (vp[3].isPrimitive()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_NOT_NONNULL_OBJECT);
return JS_FALSE;
}
if (!DefineProperties(cx, obj, &vp[3].toObject()))
return JS_FALSE;
}
/* 5. Return obj. */
return JS_TRUE;
}
static JSBool
obj_getOwnPropertyNames(JSContext *cx, uintN argc, Value *vp)
{
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.getOwnPropertyNames", &obj))
return false;
AutoIdVector keys(cx);
if (!GetPropertyNames(cx, obj, JSITER_OWNONLY | JSITER_HIDDEN, &keys))
return false;
AutoValueVector vals(cx);
if (!vals.resize(keys.length()))
return false;
for (size_t i = 0, len = keys.length(); i < len; i++) {
jsid id = keys[i];
if (JSID_IS_INT(id)) {
JSString *str = js_ValueToString(cx, Int32Value(JSID_TO_INT(id)));
if (!str)
return false;
vals[i].setString(str);
} else if (JSID_IS_ATOM(id)) {
vals[i].setString(JSID_TO_STRING(id));
} else {
vals[i].setObject(*JSID_TO_OBJECT(id));
}
}
JSObject *aobj = NewDenseCopiedArray(cx, vals.length(), vals.begin());
if (!aobj)
return false;
vp->setObject(*aobj);
return true;
}
static JSBool
obj_isExtensible(JSContext *cx, uintN argc, Value *vp)
{
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.isExtensible", &obj))
return false;
vp->setBoolean(obj->isExtensible());
return true;
}
static JSBool
obj_preventExtensions(JSContext *cx, uintN argc, Value *vp)
{
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.preventExtensions", &obj))
return false;
vp->setObject(*obj);
if (!obj->isExtensible())
return true;
AutoIdVector props(cx);
return obj->preventExtensions(cx, &props);
}
bool
JSObject::sealOrFreeze(JSContext *cx, ImmutabilityType it)
{
assertSameCompartment(cx, this);
JS_ASSERT(it == SEAL || it == FREEZE);
AutoIdVector props(cx);
if (isExtensible()) {
if (!preventExtensions(cx, &props))
return false;
} else {
if (!GetPropertyNames(cx, this, JSITER_HIDDEN | JSITER_OWNONLY, &props))
return false;
}
/* preventExtensions must slowify dense arrays, so we can assign to holes without checks. */
JS_ASSERT(!isDenseArray());
for (size_t i = 0, len = props.length(); i < len; i++) {
jsid id = props[i];
uintN attrs;
if (!getAttributes(cx, id, &attrs))
return false;
/* Make all attributes permanent; if freezing, make data attributes read-only. */
uintN new_attrs;
if (it == FREEZE && !(attrs & (JSPROP_GETTER | JSPROP_SETTER)))
new_attrs = JSPROP_PERMANENT | JSPROP_READONLY;
else
new_attrs = JSPROP_PERMANENT;
/* If we already have the attributes we need, skip the setAttributes call. */
if ((attrs | new_attrs) == attrs)
continue;
attrs |= new_attrs;
if (!setAttributes(cx, id, &attrs))
return false;
}
return true;
}
static JSBool
obj_freeze(JSContext *cx, uintN argc, Value *vp)
{
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.freeze", &obj))
return false;
vp->setObject(*obj);
return obj->freeze(cx);
}
static JSBool
obj_isFrozen(JSContext *cx, uintN argc, Value *vp)
{
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.preventExtensions", &obj))
return false;
vp->setBoolean(false);
if (obj->isExtensible())
return true; /* The JavaScript value returned is false. */
AutoIdVector props(cx);
if (!GetPropertyNames(cx, obj, JSITER_HIDDEN | JSITER_OWNONLY, &props))
return false;
for (size_t i = 0, len = props.length(); i < len; i++) {
jsid id = props[i];
uintN attrs = 0;
if (!obj->getAttributes(cx, id, &attrs))
return false;
/* The property must be non-configurable and either read-only or an accessor. */
if (!(attrs & JSPROP_PERMANENT) ||
!(attrs & (JSPROP_READONLY | JSPROP_GETTER | JSPROP_SETTER)))
return true; /* The JavaScript value returned is false. */
}
/* It really was sealed, so return true. */
vp->setBoolean(true);
return true;
}
static JSBool
obj_seal(JSContext *cx, uintN argc, Value *vp)
{
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.seal", &obj))
return false;
vp->setObject(*obj);
return obj->seal(cx);
}
static JSBool
obj_isSealed(JSContext *cx, uintN argc, Value *vp)
{
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.isSealed", &obj))
return false;
/* Assume not sealed until proven otherwise. */
vp->setBoolean(false);
if (obj->isExtensible())
return true; /* The JavaScript value returned is false. */
AutoIdVector props(cx);
if (!GetPropertyNames(cx, obj, JSITER_HIDDEN | JSITER_OWNONLY, &props))
return false;
for (size_t i = 0, len = props.length(); i < len; i++) {
jsid id = props[i];
uintN attrs;
if (!obj->getAttributes(cx, id, &attrs))
return false;
if (!(attrs & JSPROP_PERMANENT))
return true; /* The JavaScript value returned is false. */
}
/* It really was sealed, so return true. */
vp->setBoolean(true);
return true;
}
#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";
static JSFunctionSpec object_methods[] = {
#if JS_HAS_TOSOURCE
JS_FN(js_toSource_str, obj_toSource, 0,0),
#endif
JS_FN(js_toString_str, obj_toString, 0,0),
JS_FN(js_toLocaleString_str, obj_toLocaleString, 0,0),
JS_FN(js_valueOf_str, obj_valueOf, 0,0),
#if JS_HAS_OBJ_WATCHPOINT
JS_FN(js_watch_str, obj_watch, 2,0),
JS_FN(js_unwatch_str, obj_unwatch, 1,0),
#endif
JS_FN(js_hasOwnProperty_str, obj_hasOwnProperty, 1,0),
JS_FN(js_isPrototypeOf_str, obj_isPrototypeOf, 1,0),
JS_FN(js_propertyIsEnumerable_str, obj_propertyIsEnumerable, 1,0),
#if OLD_GETTER_SETTER_METHODS
JS_FN(js_defineGetter_str, js_obj_defineGetter, 2,0),
JS_FN(js_defineSetter_str, js_obj_defineSetter, 2,0),
JS_FN(js_lookupGetter_str, obj_lookupGetter, 1,0),
JS_FN(js_lookupSetter_str, obj_lookupSetter, 1,0),
#endif
JS_FS_END
};
static JSFunctionSpec object_static_methods[] = {
JS_FN("getPrototypeOf", obj_getPrototypeOf, 1,0),
JS_FN("getOwnPropertyDescriptor", obj_getOwnPropertyDescriptor,2,0),
JS_FN("keys", obj_keys, 1,0),
JS_FN("defineProperty", obj_defineProperty, 3,0),
JS_FN("defineProperties", obj_defineProperties, 2,0),
JS_FN("create", obj_create, 2,0),
JS_FN("getOwnPropertyNames", obj_getOwnPropertyNames, 1,0),
JS_FN("isExtensible", obj_isExtensible, 1,0),
JS_FN("preventExtensions", obj_preventExtensions, 1,0),
JS_FN("freeze", obj_freeze, 1,0),
JS_FN("isFrozen", obj_isFrozen, 1,0),
JS_FN("seal", obj_seal, 1,0),
JS_FN("isSealed", obj_isSealed, 1,0),
JS_FS_END
};
JSBool
js_Object(JSContext *cx, uintN argc, Value *vp)
{
JSObject *obj;
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_ValueToObjectOrNull(cx, vp[2], &obj))
return JS_FALSE;
}
if (!obj) {
/* Make an object whether this was called with 'new' or not. */
JS_ASSERT(!argc || vp[2].isNull() || vp[2].isUndefined());
gc::FinalizeKind kind = NewObjectGCKind(cx, &js_ObjectClass);
obj = NewBuiltinClassInstance(cx, &js_ObjectClass, kind);
if (!obj)
return JS_FALSE;
}
vp->setObject(*obj);
return JS_TRUE;
}
JSObject*
js_CreateThis(JSContext *cx, JSObject *callee)
{
Class *clasp = callee->getClass();
Class *newclasp = &js_ObjectClass;
if (clasp == &js_FunctionClass) {
JSFunction *fun = callee->getFunctionPrivate();
if (fun->isNative() && fun->u.n.clasp)
newclasp = fun->u.n.clasp;
}
Value protov;
if (!callee->getProperty(cx, ATOM_TO_JSID(cx->runtime->atomState.classPrototypeAtom), &protov))
return NULL;
JSObject *proto = protov.isObjectOrNull() ? protov.toObjectOrNull() : NULL;
JSObject *parent = callee->getParent();
gc::FinalizeKind kind = NewObjectGCKind(cx, newclasp);
JSObject *obj = NewObject<WithProto::Class>(cx, newclasp, proto, parent, kind);
if (obj)
obj->syncSpecialEquality();
return obj;
}
JSObject *
js_CreateThisForFunctionWithProto(JSContext *cx, JSObject *callee, JSObject *proto)
{
gc::FinalizeKind kind = NewObjectGCKind(cx, &js_ObjectClass);
return NewNonFunction<WithProto::Class>(cx, &js_ObjectClass, proto, callee->getParent(), kind);
}
JSObject *
js_CreateThisForFunction(JSContext *cx, JSObject *callee)
{
Value protov;
if (!callee->getProperty(cx,
ATOM_TO_JSID(cx->runtime->atomState.classPrototypeAtom),
&protov)) {
return NULL;
}
JSObject *proto = protov.isObject() ? &protov.toObject() : NULL;
return js_CreateThisForFunctionWithProto(cx, callee, proto);
}
#ifdef JS_TRACER
static JS_ALWAYS_INLINE JSObject*
NewObjectWithClassProto(JSContext *cx, Class *clasp, JSObject *proto,
/*gc::FinalizeKind*/ unsigned _kind)
{
JS_ASSERT(clasp->isNative());
gc::FinalizeKind kind = gc::FinalizeKind(_kind);
JSObject* obj = js_NewGCObject(cx, kind);
if (!obj)
return NULL;
if (!obj->initSharingEmptyShape(cx, clasp, proto, proto->getParent(), NULL, kind))
return NULL;
return obj;
}
JSObject* FASTCALL
js_Object_tn(JSContext* cx, JSObject* proto)
{
JS_ASSERT(!(js_ObjectClass.flags & JSCLASS_HAS_PRIVATE));
return NewObjectWithClassProto(cx, &js_ObjectClass, proto, FINALIZE_OBJECT8);
}
JS_DEFINE_TRCINFO_1(js_Object,
(2, (extern, CONSTRUCTOR_RETRY, js_Object_tn, CONTEXT, CALLEE_PROTOTYPE, 0,
nanojit::ACCSET_STORE_ANY)))
JSObject* FASTCALL
js_InitializerObject(JSContext* cx, JSObject *proto, JSObject *baseobj)
{
if (!baseobj) {
gc::FinalizeKind kind = GuessObjectGCKind(0, false);
return NewObjectWithClassProto(cx, &js_ObjectClass, proto, kind);
}
return CopyInitializerObject(cx, baseobj);
}
JS_DEFINE_CALLINFO_3(extern, OBJECT, js_InitializerObject, CONTEXT, OBJECT, OBJECT,
0, nanojit::ACCSET_STORE_ANY)
JSObject* FASTCALL
js_String_tn(JSContext* cx, JSObject* proto, JSString* str)
{
JS_ASSERT(JS_ON_TRACE(cx));
JS_ASSERT(FINALIZE_OBJECT2 == gc::GetGCObjectKind(JSCLASS_RESERVED_SLOTS(&js_StringClass)));
JSObject *obj = NewObjectWithClassProto(cx, &js_StringClass, proto, FINALIZE_OBJECT2);
if (!obj || !obj->initString(cx, str))
return NULL;
return obj;
}
JS_DEFINE_CALLINFO_3(extern, OBJECT, js_String_tn, CONTEXT, CALLEE_PROTOTYPE, STRING, 0,
nanojit::ACCSET_STORE_ANY)
JSObject * FASTCALL
js_CreateThisFromTrace(JSContext *cx, JSObject *ctor, uintN protoSlot)
{
#ifdef DEBUG
JS_ASSERT(ctor->isFunction());
JS_ASSERT(ctor->getFunctionPrivate()->isInterpreted());
jsid id = ATOM_TO_JSID(cx->runtime->atomState.classPrototypeAtom);
const Shape *shape = ctor->nativeLookup(id);
JS_ASSERT(shape->slot == protoSlot);
JS_ASSERT(!shape->configurable());
JS_ASSERT(!shape->isMethod());
#endif
JSObject *parent = ctor->getParent();
JSObject *proto;
const Value &protov = ctor->getSlotRef(protoSlot);
if (protov.isObject()) {
proto = &protov.toObject();
} else {
/*
* GetInterpretedFunctionPrototype found that ctor.prototype is
* primitive. Use Object.prototype for proto, per ES5 13.2.2 step 7.
*/
if (!js_GetClassPrototype(cx, parent, JSProto_Object, &proto))
return NULL;
}
gc::FinalizeKind kind = NewObjectGCKind(cx, &js_ObjectClass);
return NewNativeClassInstance(cx, &js_ObjectClass, proto, parent, kind);
}
JS_DEFINE_CALLINFO_3(extern, CONSTRUCTOR_RETRY, js_CreateThisFromTrace, CONTEXT, OBJECT, UINTN, 0,
nanojit::ACCSET_STORE_ANY)
#else /* !JS_TRACER */
# define js_Object_trcinfo NULL
#endif /* !JS_TRACER */
/*
* 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.
*/
JS_REQUIRES_STACK JSBool
Detecting(JSContext *cx, jsbytecode *pc)
{
JSScript *script;
jsbytecode *endpc;
JSOp op;
JSAtom *atom;
script = cx->fp()->script();
endpc = script->code + script->length;
for (;; pc += js_CodeSpec[op].length) {
JS_ASSERT_IF(!cx->fp()->hasImacropc(), script->code <= pc && pc < endpc);
/* General case: a branch or equality op follows the access. */
op = js_GetOpcode(cx, script, pc);
if (js_CodeSpec[op].format & JOF_DETECTING)
return JS_TRUE;
switch (op) {
case JSOP_NULL:
/*
* Special case #1: handle (document.all == null). Don't sweat
* about JS1.2's revision of the equality operators here.
*/
if (++pc < endpc) {
op = js_GetOpcode(cx, script, pc);
return *pc == JSOP_EQ || *pc == JSOP_NE;
}
return JS_FALSE;
case JSOP_GETGNAME:
case JSOP_NAME:
/*
* Special case #2: handle (document.all == undefined). Don't
* worry about someone redefining undefined, which was added by
* Edition 3, so is read/write for backward compatibility.
*/
GET_ATOM_FROM_BYTECODE(script, pc, 0, atom);
if (atom == cx->runtime->atomState.typeAtoms[JSTYPE_VOID] &&
(pc += js_CodeSpec[op].length) < endpc) {
op = js_GetOpcode(cx, script, pc);
return op == JSOP_EQ || op == JSOP_NE ||
op == JSOP_STRICTEQ || op == JSOP_STRICTNE;
}
return JS_FALSE;
default:
/*
* At this point, anything but an extended atom index prefix means
* we're not detecting.
*/
if (!(js_CodeSpec[op].format & JOF_INDEXBASE))
return JS_FALSE;
break;
}
}
}
/*
* Infer lookup flags from the currently executing bytecode. This does
* not attempt to infer JSRESOLVE_WITH, because the current bytecode
* does not indicate whether we are in a with statement. Return defaultFlags
* if a currently executing bytecode cannot be determined.
*/
uintN
js_InferFlags(JSContext *cx, uintN defaultFlags)
{
#ifdef JS_TRACER
if (JS_ON_TRACE(cx))
return JS_TRACE_MONITOR_ON_TRACE(cx)->bailExit->lookupFlags;
#endif
JS_ASSERT_NOT_ON_TRACE(cx);
jsbytecode *pc;
const JSCodeSpec *cs;
uint32 format;
uintN flags = 0;
JSStackFrame *const fp = js_GetTopStackFrame(cx);
if (!fp || !(pc = cx->regs->pc))
return defaultFlags;
cs = &js_CodeSpec[js_GetOpcode(cx, fp->script(), pc)];
format = cs->format;
if (JOF_MODE(format) != JOF_NAME)
flags |= JSRESOLVE_QUALIFIED;
if ((format & (JOF_SET | JOF_FOR)) || fp->isAssigning()) {
flags |= JSRESOLVE_ASSIGNING;
} else if (cs->length >= 0) {
pc += cs->length;
JSScript *script = cx->fp()->script();
if (pc < script->code + script->length && Detecting(cx, pc))
flags |= JSRESOLVE_DETECTING;
}
if (format & JOF_DECLARING)
flags |= JSRESOLVE_DECLARING;
return flags;
}
/*
* ObjectOps and Class for with-statement stack objects.
*/
static JSBool
with_LookupProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
JSProperty **propp)
{
/* Fixes bug 463997 */
uintN flags = cx->resolveFlags;
if (flags == JSRESOLVE_INFER)
flags = js_InferFlags(cx, flags);
flags |= JSRESOLVE_WITH;
JSAutoResolveFlags rf(cx, flags);
return obj->getProto()->lookupProperty(cx, id, objp, propp);
}
static JSBool
with_GetProperty(JSContext *cx, JSObject *obj, JSObject *receiver, jsid id, Value *vp)
{
return obj->getProto()->getProperty(cx, id, vp);
}
static JSBool
with_SetProperty(JSContext *cx, JSObject *obj, jsid id, Value *vp, JSBool strict)
{
return obj->getProto()->setProperty(cx, id, vp, strict);
}
static JSBool
with_GetAttributes(JSContext *cx, JSObject *obj, jsid id, uintN *attrsp)
{
return obj->getProto()->getAttributes(cx, id, attrsp);
}
static JSBool
with_SetAttributes(JSContext *cx, JSObject *obj, jsid id, uintN *attrsp)
{
return obj->getProto()->setAttributes(cx, id, attrsp);
}
static JSBool
with_DeleteProperty(JSContext *cx, JSObject *obj, jsid id, Value *rval, JSBool strict)
{
return obj->getProto()->deleteProperty(cx, id, rval, strict);
}
static JSBool
with_Enumerate(JSContext *cx, JSObject *obj, JSIterateOp enum_op,
Value *statep, jsid *idp)
{
return obj->getProto()->enumerate(cx, enum_op, statep, idp);
}
static JSType
with_TypeOf(JSContext *cx, JSObject *obj)
{
return JSTYPE_OBJECT;
}
static JSObject *
with_ThisObject(JSContext *cx, JSObject *obj)
{
return obj->getWithThis();
}
Class js_WithClass = {
"With",
JSCLASS_HAS_PRIVATE | JSCLASS_HAS_RESERVED_SLOTS(2) | JSCLASS_IS_ANONYMOUS,
PropertyStub, /* addProperty */
PropertyStub, /* delProperty */
PropertyStub, /* getProperty */
StrictPropertyStub, /* setProperty */
EnumerateStub,
ResolveStub,
ConvertStub,
NULL, /* finalize */
NULL, /* reserved */
NULL, /* checkAccess */
NULL, /* call */
NULL, /* construct */
NULL, /* xdrObject */
NULL, /* hasInstance */
NULL, /* trace */
JS_NULL_CLASS_EXT,
{
with_LookupProperty,
NULL, /* defineProperty */
with_GetProperty,
with_SetProperty,
with_GetAttributes,
with_SetAttributes,
with_DeleteProperty,
with_Enumerate,
with_TypeOf,
NULL, /* fix */
with_ThisObject,
NULL, /* clear */
}
};
JS_REQUIRES_STACK JSObject *
js_NewWithObject(JSContext *cx, JSObject *proto, JSObject *parent, jsint depth)
{
JSObject *obj;
obj = js_NewGCObject(cx, FINALIZE_OBJECT2);
if (!obj)
return NULL;
JSStackFrame *priv = js_FloatingFrameIfGenerator(cx, cx->fp());
EmptyShape *emptyWithShape = EmptyShape::getEmptyWithShape(cx);
if (!emptyWithShape)
return NULL;
obj->init(cx, &js_WithClass, proto, parent, priv, false);
obj->setMap(emptyWithShape);
OBJ_SET_BLOCK_DEPTH(cx, obj, depth);
AutoObjectRooter tvr(cx, obj);
JSObject *thisp = proto->thisObject(cx);
if (!thisp)
return NULL;
assertSameCompartment(cx, obj, thisp);
obj->setWithThis(thisp);
return obj;
}
JSObject *
js_NewBlockObject(JSContext *cx)
{
/*
* Null obj's proto slot so that Object.prototype.* does not pollute block
* scopes and to give the block object its own scope.
*/
JSObject *blockObj = js_NewGCObject(cx, FINALIZE_OBJECT2);
if (!blockObj)
return NULL;
EmptyShape *emptyBlockShape = EmptyShape::getEmptyBlockShape(cx);
if (!emptyBlockShape)
return NULL;
blockObj->init(cx, &js_BlockClass, NULL, NULL, NULL, false);
blockObj->setMap(emptyBlockShape);
return blockObj;
}
JSObject *
js_CloneBlockObject(JSContext *cx, JSObject *proto, JSStackFrame *fp)
{
JS_ASSERT(proto->isStaticBlock());
size_t count = OBJ_BLOCK_COUNT(cx, proto);
gc::FinalizeKind kind = gc::GetGCObjectKind(count + 1);
JSObject *clone = js_NewGCObject(cx, kind);
if (!clone)
return NULL;
JSStackFrame *priv = js_FloatingFrameIfGenerator(cx, fp);
/* The caller sets parent on its own. */
clone->initClonedBlock(cx, proto, priv);
if (!clone->ensureInstanceReservedSlots(cx, count + 1))
return NULL;
clone->setSlot(JSSLOT_BLOCK_DEPTH, proto->getSlot(JSSLOT_BLOCK_DEPTH));
JS_ASSERT(clone->isClonedBlock());
return clone;
}
JS_REQUIRES_STACK JSBool
js_PutBlockObject(JSContext *cx, JSBool normalUnwind)
{
JSStackFrame *const fp = cx->fp();
JSObject *obj = &fp->scopeChain();
JS_ASSERT(obj->isClonedBlock());
JS_ASSERT(obj->getPrivate() == js_FloatingFrameIfGenerator(cx, cx->fp()));
/* Block objects should have all reserved slots allocated early. */
uintN count = OBJ_BLOCK_COUNT(cx, obj);
JS_ASSERT(obj->numSlots() >= JSSLOT_BLOCK_DEPTH + 1 + count);
/* The block and its locals must be on the current stack for GC safety. */
uintN depth = OBJ_BLOCK_DEPTH(cx, obj);
JS_ASSERT(depth <= size_t(cx->regs->sp - fp->base()));
JS_ASSERT(count <= size_t(cx->regs->sp - fp->base() - depth));
/* See comments in CheckDestructuring from jsparse.cpp. */
JS_ASSERT(count >= 1);
if (normalUnwind) {
uintN slot = JSSLOT_BLOCK_FIRST_FREE_SLOT;
depth += fp->numFixed();
memcpy(obj->getSlots() + slot, fp->slots() + depth, count * sizeof(Value));
}
/* We must clear the private slot even with errors. */
obj->setPrivate(NULL);
fp->setScopeChainNoCallObj(*obj->getParent());
return normalUnwind;
}
static JSBool
block_getProperty(JSContext *cx, JSObject *obj, jsid id, Value *vp)
{
/*
* Block objects are never exposed to script, and the engine handles them
* with care. So unlike other getters, this one can assert (rather than
* check) certain invariants about obj.
*/
JS_ASSERT(obj->isClonedBlock());
uintN index = (uintN) JSID_TO_INT(id);
JS_ASSERT(index < OBJ_BLOCK_COUNT(cx, obj));
JSStackFrame *fp = (JSStackFrame *) obj->getPrivate();
if (fp) {
fp = js_LiveFrameIfGenerator(fp);
index += fp->numFixed() + OBJ_BLOCK_DEPTH(cx, obj);
JS_ASSERT(index < fp->numSlots());
*vp = fp->slots()[index];
return true;
}
/* Values are in slots immediately following the class-reserved ones. */
JS_ASSERT(obj->getSlot(JSSLOT_FREE(&js_BlockClass) + index) == *vp);
return true;
}
static JSBool
block_setProperty(JSContext *cx, JSObject *obj, jsid id, JSBool strict, Value *vp)
{
JS_ASSERT(obj->isClonedBlock());
uintN index = (uintN) JSID_TO_INT(id);
JS_ASSERT(index < OBJ_BLOCK_COUNT(cx, obj));
JSStackFrame *fp = (JSStackFrame *) obj->getPrivate();
if (fp) {
fp = js_LiveFrameIfGenerator(fp);
index += fp->numFixed() + OBJ_BLOCK_DEPTH(cx, obj);
JS_ASSERT(index < fp->numSlots());
fp->slots()[index] = *vp;
return true;
}
/*
* The value in *vp will be written back to the slot in obj that was
* allocated when this let binding was defined.
*/
return true;
}
const Shape *
JSObject::defineBlockVariable(JSContext *cx, jsid id, intN index)
{
JS_ASSERT(isStaticBlock());
/* Use JSPROP_ENUMERATE to aid the disassembler. */
uint32 slot = JSSLOT_FREE(&js_BlockClass) + index;
const Shape *shape = addProperty(cx, id,
block_getProperty, block_setProperty,
slot, JSPROP_ENUMERATE | JSPROP_PERMANENT,
Shape::HAS_SHORTID, index);
if (!shape)
return NULL;
if (slot >= numSlots() && !growSlots(cx, slot + 1))
return NULL;
return shape;
}
static size_t
GetObjectSize(JSObject *obj)
{
return (obj->isFunction() && !obj->getPrivate())
? sizeof(JSFunction)
: sizeof(JSObject) + sizeof(js::Value) * obj->numFixedSlots();
}
bool
JSObject::copyPropertiesFrom(JSContext *cx, JSObject *obj)
{
// If we're not native, then we cannot copy properties.
JS_ASSERT(isNative() == obj->isNative());
if (!isNative())
return true;
AutoShapeVector shapes(cx);
for (Shape::Range r(obj->lastProperty()); !r.empty(); r.popFront()) {
if (!shapes.append(&r.front()))
return false;
}
size_t n = shapes.length();
while (n > 0) {
const Shape *shape = shapes[--n];
uintN attrs = shape->attributes();
PropertyOp getter = shape->getter();
if ((attrs & JSPROP_GETTER) && !cx->compartment->wrap(cx, &getter))
return false;
StrictPropertyOp setter = shape->setter();
if ((attrs & JSPROP_SETTER) && !cx->compartment->wrap(cx, &setter))
return false;
Value v = shape->hasSlot() ? obj->getSlot(shape->slot) : UndefinedValue();
if (!cx->compartment->wrap(cx, &v))
return false;
if (!defineProperty(cx, shape->id, v, getter, setter, attrs))
return false;
}
return true;
}
static bool
CopySlots(JSContext *cx, JSObject *from, JSObject *to)
{
JS_ASSERT(!from->isNative() && !to->isNative());
size_t nslots = from->numSlots();
if (to->ensureSlots(cx, nslots))
return false;
size_t n = 0;
if (to->isWrapper() &&
(JSWrapper::wrapperHandler(to)->flags() & JSWrapper::CROSS_COMPARTMENT)) {
to->slots[0] = from->slots[0];
to->slots[1] = from->slots[1];
n = 2;
}
for (; n < nslots; ++n) {
Value v = from->slots[n];
if (!cx->compartment->wrap(cx, &v))
return false;
to->slots[n] = v;
}
return true;
}
JSObject *
JSObject::clone(JSContext *cx, JSObject *proto, JSObject *parent)
{
/*
* We can only clone native objects and proxies. Dense arrays are slowified if
* we try to clone them.
*/
if (!isNative()) {
if (isDenseArray()) {
if (!makeDenseArraySlow(cx))
return NULL;
} else if (!isProxy()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_CANT_CLONE_OBJECT);
return NULL;
}
}
JSObject *clone = NewObject<WithProto::Given>(cx, getClass(),
proto, parent,
gc::FinalizeKind(finalizeKind()));
if (!clone)
return NULL;
if (isNative()) {
if (clone->isFunction() && (compartment() != clone->compartment())) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_CANT_CLONE_OBJECT);
return NULL;
}
if (getClass()->flags & JSCLASS_HAS_PRIVATE)
clone->setPrivate(getPrivate());
} else {
JS_ASSERT(isProxy());
if (!CopySlots(cx, this, clone))
return NULL;
}
return clone;
}
static void
TradeGuts(JSObject *a, JSObject *b)
{
JS_ASSERT(a->compartment() == b->compartment());
JS_ASSERT(a->isFunction() == b->isFunction());
/*
* Regexp guts are more complicated -- we would need to migrate the
* refcounted JIT code blob for them across compartments instead of just
* swapping guts.
*/
JS_ASSERT(!a->isRegExp() && !b->isRegExp());
bool aInline = !a->hasSlotsArray();
bool bInline = !b->hasSlotsArray();
/* Trade the guts of the objects. */
const size_t size = GetObjectSize(a);
if (size == GetObjectSize(b)) {
/*
* If the objects are the same size, then we make no assumptions about
* whether they have dynamically allocated slots and instead just copy
* them over wholesale.
*/
char tmp[tl::Max<sizeof(JSFunction), sizeof(JSObject_Slots16)>::result];
JS_ASSERT(size <= sizeof(tmp));
memcpy(tmp, a, size);
memcpy(a, b, size);
memcpy(b, tmp, size);
/* Fixup pointers for inline slots on the objects. */
if (aInline)
b->slots = b->fixedSlots();
if (bInline)
a->slots = a->fixedSlots();
} else {
/*
* If the objects are of differing sizes, then we only copy over the
* JSObject portion (things like class, etc.) and leave it to
* JSObject::clone to copy over the dynamic slots for us.
*/
if (a->isFunction()) {
JSFunction tmp;
memcpy(&tmp, a, sizeof tmp);
memcpy(a, b, sizeof tmp);
memcpy(b, &tmp, sizeof tmp);
} else {
JSObject tmp;
memcpy(&tmp, a, sizeof tmp);
memcpy(a, b, sizeof tmp);
memcpy(b, &tmp, sizeof tmp);
}
JS_ASSERT(!aInline);
JS_ASSERT(!bInline);
}
}
/*
* Use this method with extreme caution. It trades the guts of two objects and updates
* scope ownership. This operation is not thread-safe, just as fast array to slow array
* transitions are inherently not thread-safe. Don't perform a swap operation on objects
* shared across threads or, or bad things will happen. You have been warned.
*/
bool
JSObject::swap(JSContext *cx, JSObject *other)
{
/*
* If we are swapping objects with a different number of builtin slots, force
* both to not use their inline slots.
*/
if (GetObjectSize(this) != GetObjectSize(other)) {
if (!hasSlotsArray()) {
if (!allocSlots(cx, numSlots()))
return false;
}
if (!other->hasSlotsArray()) {
if (!other->allocSlots(cx, other->numSlots()))
return false;
}
}
if (this->compartment() == other->compartment()) {
TradeGuts(this, other);
return true;
}
JSObject *thisClone;
JSObject *otherClone;
{
AutoCompartment ac(cx, other);
if (!ac.enter())
return false;
thisClone = this->clone(cx, other->getProto(), other->getParent());
if (!thisClone || !thisClone->copyPropertiesFrom(cx, this))
return false;
}
{
AutoCompartment ac(cx, this);
if (!ac.enter())
return false;
otherClone = other->clone(cx, other->getProto(), other->getParent());
if (!otherClone || !otherClone->copyPropertiesFrom(cx, other))
return false;
}
TradeGuts(this, otherClone);
TradeGuts(other, thisClone);
return true;
}
#if JS_HAS_XDR
#define NO_PARENT_INDEX ((uint32)-1)
uint32
FindObjectIndex(JSObjectArray *array, JSObject *obj)
{
size_t i;
if (array) {
i = array->length;
do {
if (array->vector[--i] == obj)
return i;
} while (i != 0);
}
return NO_PARENT_INDEX;
}
JSBool
js_XDRBlockObject(JSXDRState *xdr, JSObject **objp)
{
JSContext *cx;
uint32 parentId;
JSObject *obj, *parent;
uintN depth, count;
uint32 depthAndCount;
const Shape *shape;
cx = xdr->cx;
#ifdef __GNUC__
obj = NULL; /* quell GCC overwarning */
#endif
if (xdr->mode == JSXDR_ENCODE) {
obj = *objp;
parent = obj->getParent();
parentId = JSScript::isValidOffset(xdr->script->objectsOffset)
? FindObjectIndex(xdr->script->objects(), parent)
: NO_PARENT_INDEX;
depth = (uint16)OBJ_BLOCK_DEPTH(cx, obj);
count = (uint16)OBJ_BLOCK_COUNT(cx, obj);
depthAndCount = (uint32)(depth << 16) | count;
}
#ifdef __GNUC__ /* suppress bogus gcc warnings */
else count = 0;
#endif
/* First, XDR the parent atomid. */
if (!JS_XDRUint32(xdr, &parentId))
return JS_FALSE;
if (xdr->mode == JSXDR_DECODE) {
obj = js_NewBlockObject(cx);
if (!obj)
return JS_FALSE;
*objp = obj;
/*
* If there's a parent id, then get the parent out of our script's
* object array. We know that we XDR block object in outer-to-inner
* order, which means that getting the parent now will work.
*/
if (parentId == NO_PARENT_INDEX)
parent = NULL;
else
parent = xdr->script->getObject(parentId);
obj->setParent(parent);
}
AutoObjectRooter tvr(cx, obj);
if (!JS_XDRUint32(xdr, &depthAndCount))
return false;
if (xdr->mode == JSXDR_DECODE) {
depth = (uint16)(depthAndCount >> 16);
count = (uint16)depthAndCount;
obj->setSlot(JSSLOT_BLOCK_DEPTH, Value(Int32Value(depth)));
/*
* XDR the block object's properties. We know that there are 'count'
* properties to XDR, stored as id/shortid pairs.
*/
for (uintN i = 0; i < count; i++) {
JSAtom *atom;
/* XDR the real id. */
if (!js_XDRAtom(xdr, &atom))
return false;
if (!obj->defineBlockVariable(cx, ATOM_TO_JSID(atom), i))
return false;
}
} else {
AutoShapeVector shapes(cx);
shapes.growBy(count);
for (Shape::Range r(obj->lastProperty()); !r.empty(); r.popFront()) {
shape = &r.front();
shapes[shape->shortid] = shape;
}
/*
* XDR the block object's properties. We know that there are 'count'
* properties to XDR, stored as id/shortid pairs.
*/
for (uintN i = 0; i < count; i++) {
shape = shapes[i];
JS_ASSERT(shape->getter() == block_getProperty);
jsid propid = shape->id;
JS_ASSERT(JSID_IS_ATOM(propid));
JSAtom *atom = JSID_TO_ATOM(propid);
#ifdef DEBUG
uint16 shortid = uint16(shape->shortid);
JS_ASSERT(shortid == i);
#endif
/* XDR the real id. */
if (!js_XDRAtom(xdr, &atom))
return false;
}
}
return true;
}
#endif
Class js_BlockClass = {
"Block",
JSCLASS_HAS_PRIVATE | JSCLASS_HAS_RESERVED_SLOTS(1) | JSCLASS_IS_ANONYMOUS,
PropertyStub, /* addProperty */
PropertyStub, /* delProperty */
PropertyStub, /* getProperty */
StrictPropertyStub, /* setProperty */
EnumerateStub,
ResolveStub,
ConvertStub
};
JSObject *
js_InitObjectClass(JSContext *cx, JSObject *obj)
{
JSObject *proto = js_InitClass(cx, obj, NULL, &js_ObjectClass, js_Object, 1,
object_props, object_methods, NULL, object_static_methods);
if (!proto)
return NULL;
/* ECMA (15.1.2.1) says 'eval' is a property of the global object. */
jsid id = ATOM_TO_JSID(cx->runtime->atomState.evalAtom);
JSObject *evalobj = js_DefineFunction(cx, obj, id, eval, 1, JSFUN_STUB_GSOPS);
if (!evalobj)
return NULL;
if (obj->isGlobal()) {
if (!js_SetReservedSlot(cx, obj, JSRESERVED_GLOBAL_EVAL, ObjectValue(*evalobj)))
return NULL;
}
return proto;
}
static bool
DefineStandardSlot(JSContext *cx, JSObject *obj, JSProtoKey key, JSAtom *atom,
const Value &v, uint32 attrs, bool &named)
{
jsid id = ATOM_TO_JSID(atom);
if (key != JSProto_Null) {
/*
* Initializing an actual standard class on a global object. If the
* property is not yet present, force it into a new one bound to a
* reserved slot. Otherwise, go through the normal property path.
*/
JS_ASSERT(obj->isGlobal());
JS_ASSERT(obj->isNative());
if (!obj->ensureClassReservedSlots(cx))
return false;
const Shape *shape = obj->nativeLookup(id);
if (!shape) {
uint32 slot = 2 * JSProto_LIMIT + key;
if (!js_SetReservedSlot(cx, obj, slot, v))
return false;
if (!obj->addProperty(cx, id, PropertyStub, StrictPropertyStub, slot, attrs, 0, 0))
return false;
named = true;
return true;
}
}
named = obj->defineProperty(cx, id, v, PropertyStub, StrictPropertyStub, attrs);
return named;
}
namespace js {
JSObject *
DefineConstructorAndPrototype(JSContext *cx, JSObject *obj, JSProtoKey key, JSAtom *atom,
JSObject *protoProto, Class *clasp,
Native constructor, uintN nargs,
JSPropertySpec *ps, JSFunctionSpec *fs,
JSPropertySpec *static_ps, JSFunctionSpec *static_fs)
{
/*
* Create a prototype object for this class.
*
* FIXME: lazy standard (built-in) class initialization and even older
* eager boostrapping code rely on all of these properties:
*
* 1. NewObject attempting to compute a default prototype object when
* passed null for proto; and
*
* 2. NewObject tolerating no default prototype (null proto slot value)
* due to this js_InitClass call coming from js_InitFunctionClass on an
* otherwise-uninitialized global.
*
* 3. NewObject allocating a JSFunction-sized GC-thing when clasp is
* &js_FunctionClass, not a JSObject-sized (smaller) GC-thing.
*
* The JS_NewObjectForGivenProto and JS_NewObject APIs also allow clasp to
* be &js_FunctionClass (we could break compatibility easily). But fixing
* (3) is not enough without addressing the bootstrapping dependency on (1)
* and (2).
*/
JSObject *proto = NewObject<WithProto::Class>(cx, clasp, protoProto, obj);
if (!proto)
return NULL;
proto->syncSpecialEquality();
/* After this point, control must exit via label bad or out. */
AutoObjectRooter tvr(cx, proto);
JSObject *ctor;
bool named = false;
if (!constructor) {
/*
* Lacking a constructor, name the prototype (e.g., Math) unless this
* class (a) is anonymous, i.e. for internal use only; (b) the class
* of obj (the global object) is has a reserved slot indexed by key;
* and (c) key is not the null key.
*/
if (!(clasp->flags & JSCLASS_IS_ANONYMOUS) || !obj->isGlobal() || key == JSProto_Null) {
uint32 attrs = (clasp->flags & JSCLASS_IS_ANONYMOUS)
? JSPROP_READONLY | JSPROP_PERMANENT
: 0;
if (!DefineStandardSlot(cx, obj, key, atom, ObjectValue(*proto), attrs, named))
goto bad;
}
ctor = proto;
} else {
JSFunction *fun = js_NewFunction(cx, NULL, constructor, nargs, JSFUN_CONSTRUCTOR, obj, atom);
if (!fun)
goto bad;
AutoValueRooter tvr2(cx, ObjectValue(*fun));
if (!DefineStandardSlot(cx, obj, key, atom, tvr2.value(), 0, named))
goto bad;
/*
* Remember the class this function is a constructor for so that
* we know to create an object of this class when we call the
* constructor.
*/
FUN_CLASP(fun) = clasp;
/*
* Optionally construct the prototype object, before the class has
* been fully initialized. Allow the ctor to replace proto with a
* different object, as is done for operator new -- and as at least
* XML support requires.
*/
ctor = FUN_OBJECT(fun);
if (clasp->flags & JSCLASS_CONSTRUCT_PROTOTYPE) {
Value rval;
if (!InvokeConstructorWithGivenThis(cx, proto, ObjectOrNullValue(ctor),
0, NULL, &rval)) {
goto bad;
}
if (rval.isObject() && &rval.toObject() != proto)
proto = &rval.toObject();
}
/* Connect constructor and prototype by named properties. */
if (!js_SetClassPrototype(cx, ctor, proto,
JSPROP_READONLY | JSPROP_PERMANENT)) {
goto bad;
}
/* Bootstrap Function.prototype (see also JS_InitStandardClasses). */
if (ctor->getClass() == clasp)
ctor->setProto(proto);
}
/* Add properties and methods to the prototype and the constructor. */
if ((ps && !JS_DefineProperties(cx, proto, ps)) ||
(fs && !JS_DefineFunctions(cx, proto, fs)) ||
(static_ps && !JS_DefineProperties(cx, ctor, static_ps)) ||
(static_fs && !JS_DefineFunctions(cx, ctor, static_fs))) {
goto bad;
}
/*
* Pre-brand the prototype and constructor if they have built-in methods.
* This avoids extra shape guard branch exits in the tracejitted code.
*/
if (fs)
proto->brand(cx);
if (ctor != proto && static_fs)
ctor->brand(cx);
/*
* Make sure proto's emptyShape is available to be shared by objects of
* this class. JSObject::emptyShape is a one-slot cache. If we omit this,
* some other class could snap it up. (The risk is particularly great for
* Object.prototype.)
*
* All callers of JSObject::initSharingEmptyShape depend on this.
*
* FIXME: bug 592296 -- js_InitArrayClass should pass &js_SlowArrayClass
* and make the Array.prototype slow from the start.
*/
JS_ASSERT_IF(proto->clasp != clasp,
clasp == &js_ArrayClass && proto->clasp == &js_SlowArrayClass);
if (!proto->getEmptyShape(cx, proto->clasp, FINALIZE_OBJECT0))
goto bad;
if (clasp->flags & (JSCLASS_FREEZE_PROTO|JSCLASS_FREEZE_CTOR)) {
JS_ASSERT_IF(ctor == proto, !(clasp->flags & JSCLASS_FREEZE_CTOR));
if (proto && (clasp->flags & JSCLASS_FREEZE_PROTO) && !proto->freeze(cx))
goto bad;
if (ctor && (clasp->flags & JSCLASS_FREEZE_CTOR) && !ctor->freeze(cx))
goto bad;
}
/* If this is a standard class, cache its prototype. */
if (key != JSProto_Null && !js_SetClassObject(cx, obj, key, ctor, proto))
goto bad;
return proto;
bad:
if (named) {
Value rval;
obj->deleteProperty(cx, ATOM_TO_JSID(atom), &rval, false);
}
return NULL;
}
}
JSObject *
js_InitClass(JSContext *cx, JSObject *obj, JSObject *protoProto,
Class *clasp, Native constructor, uintN nargs,
JSPropertySpec *ps, JSFunctionSpec *fs,
JSPropertySpec *static_ps, JSFunctionSpec *static_fs)
{
JSAtom *atom = js_Atomize(cx, clasp->name, strlen(clasp->name), 0);
if (!atom)
return NULL;
/*
* All instances of the class will inherit properties from the prototype
* object we are about to create (in DefineConstructorAndPrototype), which
* in turn will inherit from protoProto.
*
* When initializing a standard class (other than Object), if protoProto is
* null, default to the Object prototype object. The engine's internal uses
* of js_InitClass depend on this nicety. Note that in
* js_InitFunctionAndObjectClasses, we specially hack the resolving table
* and then depend on js_GetClassPrototype here leaving protoProto NULL and
* returning true.
*/
JSProtoKey key = JSCLASS_CACHED_PROTO_KEY(clasp);
if (key != JSProto_Null &&
!protoProto &&
!js_GetClassPrototype(cx, obj, JSProto_Object, &protoProto)) {
return NULL;
}
return DefineConstructorAndPrototype(cx, obj, key, atom, protoProto, clasp, constructor, nargs,
ps, fs, static_ps, static_fs);
}
bool
JSObject::allocSlots(JSContext *cx, size_t newcap)
{
uint32 oldcap = numSlots();
JS_ASSERT(newcap >= oldcap && !hasSlotsArray());
if (newcap > NSLOTS_LIMIT) {
if (!JS_ON_TRACE(cx))
js_ReportAllocationOverflow(cx);
return false;
}
Value *tmpslots = (Value*) cx->malloc_(newcap * sizeof(Value));
if (!tmpslots)
return false; /* Leave slots at inline buffer. */
slots = tmpslots;
capacity = newcap;
/* Copy over anything from the inline buffer. */
memcpy(slots, fixedSlots(), oldcap * sizeof(Value));
ClearValueRange(slots + oldcap, newcap - oldcap, isDenseArray());
return true;
}
bool
JSObject::growSlots(JSContext *cx, size_t newcap)
{
/*
* When an object with CAPACITY_DOUBLING_MAX or fewer slots needs to
* grow, double its capacity, to add N elements in amortized O(N) time.
*
* Above this limit, grow by 12.5% each time. Speed is still amortized
* O(N), with a higher constant factor, and we waste less space.
*/
static const size_t CAPACITY_DOUBLING_MAX = 1024 * 1024;
static const size_t CAPACITY_CHUNK = CAPACITY_DOUBLING_MAX / sizeof(Value);
uint32 oldcap = numSlots();
JS_ASSERT(oldcap < newcap);
uint32 nextsize = (oldcap <= CAPACITY_DOUBLING_MAX)
? oldcap * 2
: oldcap + (oldcap >> 3);
uint32 actualCapacity = JS_MAX(newcap, nextsize);
if (actualCapacity >= CAPACITY_CHUNK)
actualCapacity = JS_ROUNDUP(actualCapacity, CAPACITY_CHUNK);
else if (actualCapacity < SLOT_CAPACITY_MIN)
actualCapacity = SLOT_CAPACITY_MIN;
/* Don't let nslots get close to wrapping around uint32. */
if (actualCapacity >= NSLOTS_LIMIT) {
JS_ReportOutOfMemory(cx);
return false;
}
/* If nothing was allocated yet, treat it as initial allocation. */
if (!hasSlotsArray())
return allocSlots(cx, actualCapacity);
Value *tmpslots = (Value*) cx->realloc_(slots, oldcap * sizeof(Value), actualCapacity * sizeof(Value));
if (!tmpslots)
return false; /* Leave dslots as its old size. */
slots = tmpslots;
capacity = actualCapacity;
/* Initialize the additional slots we added. */
ClearValueRange(slots + oldcap, actualCapacity - oldcap, isDenseArray());
return true;
}
void
JSObject::shrinkSlots(JSContext *cx, size_t newcap)
{
uint32 oldcap = numSlots();
JS_ASSERT(newcap <= oldcap);
JS_ASSERT(newcap >= slotSpan());
if (oldcap <= SLOT_CAPACITY_MIN || !hasSlotsArray()) {
/* We won't shrink the slots any more. Clear excess holes. */
ClearValueRange(slots + newcap, oldcap - newcap, isDenseArray());
return;
}
uint32 fill = newcap;
if (newcap < SLOT_CAPACITY_MIN)
newcap = SLOT_CAPACITY_MIN;
if (newcap < numFixedSlots())
newcap = numFixedSlots();
Value *tmpslots = (Value*) cx->realloc_(slots, newcap * sizeof(Value));
if (!tmpslots)
return; /* Leave slots at its old size. */
slots = tmpslots;
capacity = newcap;
if (fill < newcap) {
/* Clear any excess holes if we tried to shrink below SLOT_CAPACITY_MIN. */
ClearValueRange(slots + fill, newcap - fill, isDenseArray());
}
}
bool
JSObject::ensureInstanceReservedSlots(JSContext *cx, size_t nreserved)
{
JS_ASSERT_IF(isNative(),
isBlock() || isCall() || (isFunction() && isBoundFunction()));
uintN nslots = JSSLOT_FREE(clasp) + nreserved;
return nslots <= numSlots() || allocSlots(cx, nslots);
}
static 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
};
namespace js {
bool
SetProto(JSContext *cx, JSObject *obj, JSObject *proto, bool checkForCycles)
{
JS_ASSERT_IF(!checkForCycles, obj != proto);
JS_ASSERT(obj->isExtensible());
if (obj->isNative()) {
if (!obj->ensureClassReservedSlots(cx))
return false;
}
/*
* Regenerate property cache shape ids for all of the scopes along the
* old prototype chain to invalidate their property cache entries, in
* case any entries were filled by looking up through obj.
*/
JSObject *oldproto = obj;
while (oldproto && oldproto->isNative()) {
oldproto->protoShapeChange(cx);
oldproto = oldproto->getProto();
}
if (!proto || !checkForCycles) {
obj->setProto(proto);
} else if (!SetProtoCheckingForCycles(cx, obj, proto)) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CYCLIC_VALUE, js_proto_str);
return false;
}
return true;
}
}
JSBool
js_GetClassObject(JSContext *cx, JSObject *obj, JSProtoKey key,
JSObject **objp)
{
obj = obj->getGlobal();
if (!obj->isGlobal()) {
*objp = NULL;
return true;
}
Value v = obj->getReservedSlot(key);
if (v.isObject()) {
*objp = &v.toObject();
return true;
}
AutoResolving resolving(cx, obj, ATOM_TO_JSID(cx->runtime->atomState.classAtoms[key]));
if (resolving.alreadyStarted()) {
/* Already caching id in obj -- suppress recursion. */
*objp = NULL;
return true;
}
JSObject *cobj = NULL;
if (JSObjectOp init = lazy_prototype_init[key]) {
if (!init(cx, obj))
return false;
v = obj->getReservedSlot(key);
if (v.isObject())
cobj = &v.toObject();
}
*objp = cobj;
return true;
}
JSBool
js_SetClassObject(JSContext *cx, JSObject *obj, JSProtoKey key, JSObject *cobj, JSObject *proto)
{
JS_ASSERT(!obj->getParent());
if (!obj->isGlobal())
return JS_TRUE;
return js_SetReservedSlot(cx, obj, key, ObjectOrNullValue(cobj)) &&
js_SetReservedSlot(cx, obj, JSProto_LIMIT + key, ObjectOrNullValue(proto));
}
JSBool
js_FindClassObject(JSContext *cx, JSObject *start, JSProtoKey protoKey,
Value *vp, Class *clasp)
{
JSStackFrame *fp;
JSObject *obj, *cobj, *pobj;
jsid id;
JSProperty *prop;
const Shape *shape;
/*
* Find the global object. Use cx->fp() directly to avoid falling off
* trace; all JIT-elided stack frames have the same global object as
* cx->fp().
*/
VOUCH_DOES_NOT_REQUIRE_STACK();
if (!start && (fp = cx->maybefp()) != NULL)
start = &fp->scopeChain();
if (start) {
/* Find the topmost object in the scope chain. */
do {
obj = start;
start = obj->getParent();
} while (start);
} else {
obj = cx->globalObject;
if (!obj) {
vp->setUndefined();
return JS_TRUE;
}
}
OBJ_TO_INNER_OBJECT(cx, obj);
if (!obj)
return JS_FALSE;
if (protoKey != JSProto_Null) {
JS_ASSERT(JSProto_Null < protoKey);
JS_ASSERT(protoKey < JSProto_LIMIT);
if (!js_GetClassObject(cx, obj, protoKey, &cobj))
return JS_FALSE;
if (cobj) {
vp->setObject(*cobj);
return JS_TRUE;
}
id = ATOM_TO_JSID(cx->runtime->atomState.classAtoms[protoKey]);
} else {
JSAtom *atom = js_Atomize(cx, clasp->name, strlen(clasp->name), 0);
if (!atom)
return false;
id = ATOM_TO_JSID(atom);
}
JS_ASSERT(obj->isNative());
if (js_LookupPropertyWithFlags(cx, obj, id, JSRESOLVE_CLASSNAME,
&pobj, &prop) < 0) {
return JS_FALSE;
}
Value v = UndefinedValue();
if (prop && pobj->isNative()) {
shape = (Shape *) prop;
if (pobj->containsSlot(shape->slot)) {
v = pobj->nativeGetSlot(shape->slot);
if (v.isPrimitive())
v.setUndefined();
}
}
*vp = v;
return JS_TRUE;
}
JSObject *
js_ConstructObject(JSContext *cx, Class *clasp, JSObject *proto, JSObject *parent,
uintN argc, Value *argv)
{
AutoArrayRooter argtvr(cx, argc, argv);
JSProtoKey protoKey = GetClassProtoKey(clasp);
/* Protect constructor in case a crazy getter for .prototype uproots it. */
AutoValueRooter tvr(cx);
if (!js_FindClassObject(cx, parent, protoKey, tvr.addr(), clasp))
return NULL;
const Value &cval = tvr.value();
if (tvr.value().isPrimitive()) {
js_ReportIsNotFunction(cx, tvr.addr(), JSV2F_CONSTRUCT | JSV2F_SEARCH_STACK);
return NULL;
}
/*
* If proto is NULL, set it to Constructor.prototype, just like JSOP_NEW
* does, likewise for the new object's parent.
*/
JSObject *ctor = &cval.toObject();
if (!parent)
parent = ctor->getParent();
if (!proto) {
Value rval;
if (!ctor->getProperty(cx, ATOM_TO_JSID(cx->runtime->atomState.classPrototypeAtom),
&rval)) {
return NULL;
}
if (rval.isObjectOrNull())
proto = rval.toObjectOrNull();
}
JSObject *obj = NewObject<WithProto::Class>(cx, clasp, proto, parent);
if (!obj)
return NULL;
obj->syncSpecialEquality();
Value rval;
if (!InvokeConstructorWithGivenThis(cx, obj, cval, argc, argv, &rval))
return NULL;
if (rval.isPrimitive())
return obj;
/*
* 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.
*/
obj = &rval.toObject();
if (obj->getClass() != clasp ||
(!(~clasp->flags & (JSCLASS_HAS_PRIVATE |
JSCLASS_CONSTRUCT_PROTOTYPE)) &&
!obj->getPrivate())) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_WRONG_CONSTRUCTOR, clasp->name);
return NULL;
}
return obj;
}
bool
JSObject::allocSlot(JSContext *cx, uint32 *slotp)
{
uint32 slot = slotSpan();
JS_ASSERT(slot >= JSSLOT_FREE(clasp));
/*
* If this object is in dictionary mode and it has a property table, try to
* pull a free slot from the property table's slot-number freelist.
*/
if (inDictionaryMode() && lastProp->hasTable()) {
uint32 &last = lastProp->getTable()->freelist;
if (last != SHAPE_INVALID_SLOT) {
#ifdef DEBUG
JS_ASSERT(last < slot);
uint32 next = getSlot(last).toPrivateUint32();
JS_ASSERT_IF(next != SHAPE_INVALID_SLOT, next < slot);
#endif
*slotp = last;
Value &vref = getSlotRef(last);
last = vref.toPrivateUint32();
vref.setUndefined();
return true;
}
}
if (slot >= numSlots() && !growSlots(cx, slot + 1))
return false;
/* JSObject::growSlots or JSObject::freeSlot should set the free slots to void. */
JS_ASSERT(getSlot(slot).isUndefined());
*slotp = slot;
return true;
}
bool
JSObject::freeSlot(JSContext *cx, uint32 slot)
{
uint32 limit = slotSpan();
JS_ASSERT(slot < limit);
Value &vref = getSlotRef(slot);
if (inDictionaryMode() && lastProp->hasTable()) {
uint32 &last = lastProp->getTable()->freelist;
/* Can't afford to check the whole freelist, but let's check the head. */
JS_ASSERT_IF(last != SHAPE_INVALID_SLOT, last < limit && last != slot);
/*
* Freeing a slot other than the last one mapped by this object's
* shape (and not a reserved slot; see bug 595230): push the slot onto
* the dictionary property table's freelist. We want to let the last
* slot be freed by shrinking the dslots vector; see js_TraceObject.
*/
if (JSSLOT_FREE(clasp) <= slot && slot + 1 < limit) {
JS_ASSERT_IF(last != SHAPE_INVALID_SLOT, last < slotSpan());
vref.setPrivateUint32(last);
last = slot;
return true;
}
}
vref.setUndefined();
return false;
}
/* JSBOXEDWORD_INT_MAX as a string */
#define JSBOXEDWORD_INT_MAX_STRING "1073741823"
/*
* Convert string indexes that convert to int jsvals as ints to save memory.
* Care must be taken to use this macro every time a property name is used, or
* else double-sets, incorrect property cache misses, or other mistakes could
* occur.
*/
jsid
js_CheckForStringIndex(jsid id)
{
if (!JSID_IS_ATOM(id))
return id;
JSAtom *atom = JSID_TO_ATOM(id);
const jschar *s = atom->chars();
jschar ch = *s;
JSBool negative = (ch == '-');
if (negative)
ch = *++s;
if (!JS7_ISDEC(ch))
return id;
size_t n = atom->length() - negative;
if (n > sizeof(JSBOXEDWORD_INT_MAX_STRING) - 1)
return id;
const jschar *cp = s;
const jschar *end = s + n;
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++;
}
}
/*
* Non-integer indexes can't be represented as integers. Also, distinguish
* index "-0" from "0", because JSBOXEDWORD_INT cannot.
*/
if (cp != end || (negative && index == 0))
return id;
if (negative) {
if (oldIndex < -(JSID_INT_MIN / 10) ||
(oldIndex == -(JSID_INT_MIN / 10) && c <= (-JSID_INT_MIN % 10)))
{
id = INT_TO_JSID(-jsint(index));
}
} else {
if (oldIndex < JSID_INT_MAX / 10 ||
(oldIndex == JSID_INT_MAX / 10 && c <= (JSID_INT_MAX % 10)))
{
id = INT_TO_JSID(jsint(index));
}
}
return id;
}
static JSBool
PurgeProtoChain(JSContext *cx, JSObject *obj, jsid id)
{
const Shape *shape;
while (obj) {
if (!obj->isNative()) {
obj = obj->getProto();
continue;
}
shape = obj->nativeLookup(id);
if (shape) {
PCMETER(JS_PROPERTY_CACHE(cx).pcpurges++);
obj->shadowingShapeChange(cx, *shape);
if (!obj->getParent()) {
/*
* All scope chains end in a global object, so this will change
* the global shape. jstracer.cpp assumes that the global shape
* never changes on trace, so we must deep-bail here.
*/
LeaveTrace(cx);
}
return JS_TRUE;
}
obj = obj->getProto();
}
return JS_FALSE;
}
void
js_PurgeScopeChainHelper(JSContext *cx, JSObject *obj, jsid id)
{
JS_ASSERT(obj->isDelegate());
PurgeProtoChain(cx, obj->getProto(), id);
/*
* We must purge the scope chain only for Call objects as they are the only
* kind of cacheable non-global object that can gain properties after outer
* properties with the same names have been cached or traced. Call objects
* may gain such properties via eval introducing new vars; see bug 490364.
*/
if (obj->isCall()) {
while ((obj = obj->getParent()) != NULL) {
if (PurgeProtoChain(cx, obj, id))
break;
}
}
}
const Shape *
js_AddNativeProperty(JSContext *cx, JSObject *obj, jsid id,
PropertyOp getter, StrictPropertyOp setter, uint32 slot,
uintN attrs, uintN flags, intN shortid)
{
JS_ASSERT(!(flags & Shape::METHOD));
/*
* Purge the property cache of now-shadowed id in obj's scope chain. Do
* this optimistically (assuming no failure below) before locking obj, so
* we can lock the shadowed scope.
*/
js_PurgeScopeChain(cx, obj, id);
if (!obj->ensureClassReservedSlots(cx))
return NULL;
/* Convert string indices to integers if appropriate. */
id = js_CheckForStringIndex(id);
return obj->putProperty(cx, id, getter, setter, slot, attrs, flags, shortid);
}
const Shape *
js_ChangeNativePropertyAttrs(JSContext *cx, JSObject *obj,
const Shape *shape, uintN attrs, uintN mask,
PropertyOp getter, StrictPropertyOp setter)
{
if (!obj->ensureClassReservedSlots(cx))
return NULL;
/*
* Check for freezing an object with shape-memoized methods here, on a
* shape-by-shape basis. Note that getter may be a pun of the method's
* joined function object value, to indicate "no getter change". In this
* case we must null getter to get the desired PropertyStub behavior.
*/
if ((attrs & JSPROP_READONLY) && shape->isMethod()) {
JSObject *funobj = &shape->methodObject();
Value v = ObjectValue(*funobj);
shape = obj->methodReadBarrier(cx, *shape, &v);
if (!shape)
return NULL;
if (CastAsObject(getter) == funobj) {
JS_ASSERT(!(attrs & JSPROP_GETTER));
getter = NULL;
}
}
return obj->changeProperty(cx, shape, attrs, mask, getter, setter);
}
JSBool
js_DefineProperty(JSContext *cx, JSObject *obj, jsid id, const Value *value,
PropertyOp getter, StrictPropertyOp setter, uintN attrs)
{
return js_DefineNativeProperty(cx, obj, id, *value, getter, setter, attrs,
0, 0, NULL);
}
/*
* Backward compatibility requires allowing addProperty hooks to mutate the
* nominal initial value of a slotful 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.
*/
static inline bool
CallAddPropertyHook(JSContext *cx, Class *clasp, JSObject *obj, const Shape *shape, Value *vp)
{
if (clasp->addProperty != PropertyStub) {
Value nominal = *vp;
if (!CallJSPropertyOp(cx, clasp->addProperty, obj, shape->id, vp))
return false;
if (*vp != nominal) {
if (obj->containsSlot(shape->slot))
obj->nativeSetSlot(shape->slot, *vp);
}
}
return true;
}
JSBool
js_DefineNativeProperty(JSContext *cx, JSObject *obj, jsid id, const Value &value,
PropertyOp getter, StrictPropertyOp setter, uintN attrs,
uintN flags, intN shortid, JSProperty **propp,
uintN defineHow /* = 0 */)
{
JS_ASSERT((defineHow & ~(JSDNP_CACHE_RESULT | JSDNP_DONT_PURGE | JSDNP_SET_METHOD)) == 0);
LeaveTraceIfGlobalObject(cx, obj);
/* Convert string indices to integers if appropriate. */
id = js_CheckForStringIndex(id);
/*
* 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.
*/
const Shape *shape = NULL;
if (attrs & (JSPROP_GETTER | JSPROP_SETTER)) {
JSObject *pobj;
JSProperty *prop;
/*
* If JS_THREADSAFE and id is found, js_LookupProperty returns with
* shape 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 obj->changeProperty, and refresh the property
* cache line for (obj, id) to map shape.
*/
if (!js_LookupProperty(cx, obj, id, &pobj, &prop))
return JS_FALSE;
shape = (Shape *) prop;
if (shape && pobj == obj && shape->isAccessorDescriptor()) {
shape = obj->changeProperty(cx, shape, attrs,
JSPROP_GETTER | JSPROP_SETTER,
(attrs & JSPROP_GETTER)
? getter
: shape->getter(),
(attrs & JSPROP_SETTER)
? setter
: shape->setter());
if (!shape)
return false;
} else if (prop) {
prop = NULL;
shape = NULL;
}
}
/*
* Purge the property cache of any properties named by id that are about
* to be shadowed in obj's scope chain unless it is known a priori that it
* is not possible. We do this before locking obj to avoid nesting locks.
*/
if (!(defineHow & JSDNP_DONT_PURGE))
js_PurgeScopeChain(cx, obj, id);
/*
* Check whether a readonly property or setter is being defined on a known
* prototype object. See the comment in jscntxt.h before protoHazardShape's
* member declaration.
*/
if (obj->isDelegate() && (attrs & (JSPROP_READONLY | JSPROP_SETTER)))
cx->runtime->protoHazardShape = js_GenerateShape(cx);
/* Use the object's class getter and setter by default. */
Class *clasp = obj->getClass();
if (!(defineHow & JSDNP_SET_METHOD)) {
if (!getter && !(attrs & JSPROP_GETTER))
getter = clasp->getProperty;
if (!setter && !(attrs & JSPROP_SETTER))
setter = clasp->setProperty;
}
/* Get obj's own scope if it has one, or create a new one for obj. */
if (!obj->ensureClassReservedSlots(cx))
return false;
/*
* Make a local copy of value, in case a method barrier needs to update the
* value to define, and just so addProperty can mutate its inout parameter.
*/
Value valueCopy = value;
bool adding = false;
if (!shape) {
/* Add a new property, or replace an existing one of the same id. */
if (defineHow & JSDNP_SET_METHOD) {
JS_ASSERT(clasp == &js_ObjectClass);
JS_ASSERT(IsFunctionObject(value));
JS_ASSERT(!(attrs & (JSPROP_GETTER | JSPROP_SETTER)));
JS_ASSERT(!getter && !setter);
JSObject *funobj = &value.toObject();
if (FUN_OBJECT(GET_FUNCTION_PRIVATE(cx, funobj)) == funobj) {
flags |= Shape::METHOD;
getter = CastAsPropertyOp(funobj);
}
}
if (const Shape *existingShape = obj->nativeLookup(id)) {
if (existingShape->hasSlot())
AbortRecordingIfUnexpectedGlobalWrite(cx, obj, existingShape->slot);
if (existingShape->isMethod() &&
ObjectValue(existingShape->methodObject()) == valueCopy)
{
/*
* Redefining an existing shape-memoized method object without
* changing the property's value, perhaps to change attributes.
* Clone now via the method read barrier.
*
* But first, assert that our caller is not trying to preserve
* the joined function object value as the getter object for
* the redefined property. The joined function object cannot
* yet have leaked, so only an internal code path could attempt
* such a thing. Any such path would be a bug to fix.
*/
JS_ASSERT(existingShape->getter() != getter);
if (!obj->methodReadBarrier(cx, *existingShape, &valueCopy))
return false;
}
} else {
adding = true;
}
uint32 oldShape = obj->shape();
shape = obj->putProperty(cx, id, getter, setter, SHAPE_INVALID_SLOT,
attrs, flags, shortid);
if (!shape)
return false;
/*
* If shape is a joined method, the above call to putProperty suffices
* to update the object's shape id if need be (because the shape's hash
* identity includes the method value).
*
* But if scope->branded(), the object's shape id may not have changed
* and we may be overwriting a cached function-valued property (note
* how methodWriteBarrier checks previous vs. would-be current value).
* See bug 560998.
*/
if (obj->shape() == oldShape && obj->branded() && shape->slot != SHAPE_INVALID_SLOT) {
#ifdef DEBUG
const Shape *newshape =
#endif
obj->methodWriteBarrier(cx, *shape, valueCopy);
JS_ASSERT(newshape == shape);
}
}
/* Store valueCopy before calling addProperty, in case the latter GC's. */
if (obj->containsSlot(shape->slot))
obj->nativeSetSlot(shape->slot, valueCopy);
/* XXXbe called with lock held */
if (!CallAddPropertyHook(cx, clasp, obj, shape, &valueCopy)) {
obj->removeProperty(cx, id);
return false;
}
if (defineHow & JSDNP_CACHE_RESULT) {
JS_ASSERT_NOT_ON_TRACE(cx);
if (adding) {
JS_PROPERTY_CACHE(cx).fill(cx, obj, 0, 0, obj, shape, true);
TRACE_1(AddProperty, obj);
}
}
if (propp)
*propp = (JSProperty *) shape;
return true;
#ifdef JS_TRACER
error: // TRACE_1 jumps here on error.
#endif
return false;
}
#define SCOPE_DEPTH_ACCUM(bs,val) \
JS_SCOPE_DEPTH_METERING(JS_BASIC_STATS_ACCUM(bs, val))
/*
* Call obj's resolve hook.
*
* cx, start, id, and flags are the parameters initially passed to the ongoing
* lookup; objp and propp are its out parameters. obj is an object along
* start's prototype chain.
*
* There are four possible outcomes:
*
* - On failure, report an error or exception and return false.
*
* - If we are already resolving a property of *curobjp, set *recursedp = true,
* and return true.
*
* - If the resolve hook finds or defines the sought property, set *objp and
* *propp appropriately, set *recursedp = false, and return true.
*
* - Otherwise no property was resolved. Set *propp = NULL and *recursedp = false
* and return true.
*/
static JSBool
CallResolveOp(JSContext *cx, JSObject *start, JSObject *obj, jsid id, uintN flags,
JSObject **objp, JSProperty **propp, bool *recursedp)
{
Class *clasp = obj->getClass();
JSResolveOp resolve = clasp->resolve;
/*
* Avoid recursion on (obj, id) already being resolved on cx.
*
* 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.
*/
AutoResolving resolving(cx, obj, id);
if (resolving.alreadyStarted()) {
/* Already resolving id in obj -- suppress recursion. */
*recursedp = true;
return true;
}
*recursedp = false;
*propp = NULL;
if (clasp->flags & JSCLASS_NEW_RESOLVE) {
JSNewResolveOp newresolve = reinterpret_cast<JSNewResolveOp>(resolve);
if (flags == JSRESOLVE_INFER)
flags = js_InferFlags(cx, 0);
JSObject *obj2 = (clasp->flags & JSCLASS_NEW_RESOLVE_GETS_START) ? start : NULL;
if (!newresolve(cx, obj, id, flags, &obj2))
return false;
/*
* We trust the new style resolve hook to set obj2 to NULL when
* the id cannot be resolved. But, when obj2 is not null, we do
* not assume that id must exist and do full nativeLookup for
* compatibility.
*/
if (!obj2)
return true;
if (!obj2->isNative()) {
/* Whoops, newresolve handed back a foreign obj2. */
JS_ASSERT(obj2 != obj);
return obj2->lookupProperty(cx, id, objp, propp);
}
obj = obj2;
} else {
if (!resolve(cx, obj, id))
return false;
}
if (!obj->nativeEmpty()) {
if (const Shape *shape = obj->nativeLookup(id)) {
*objp = obj;
*propp = (JSProperty *) shape;
}
}
return true;
}
static JS_ALWAYS_INLINE int
js_LookupPropertyWithFlagsInline(JSContext *cx, JSObject *obj, jsid id, uintN flags,
JSObject **objp, JSProperty **propp)
{
/* We should not get string indices which aren't already integers here. */
JS_ASSERT(id == js_CheckForStringIndex(id));
/* Search scopes starting with obj and following the prototype link. */
JSObject *start = obj;
int protoIndex;
for (protoIndex = 0; ; protoIndex++) {
const Shape *shape = obj->nativeLookup(id);
if (shape) {
SCOPE_DEPTH_ACCUM(&cx->runtime->protoLookupDepthStats, protoIndex);
*objp = obj;
*propp = (JSProperty *) shape;
return protoIndex;
}
/* Try obj's class resolve hook if id was not found in obj's scope. */
if (!shape && obj->getClass()->resolve != JS_ResolveStub) {
bool recursed;
if (!CallResolveOp(cx, start, obj, id, flags, objp, propp, &recursed))
return -1;
if (recursed)
break;
if (*propp) {
/* Recalculate protoIndex in case it was resolved on some other object. */
protoIndex = 0;
for (JSObject *proto = start; proto && proto != *objp; proto = proto->getProto())
protoIndex++;
SCOPE_DEPTH_ACCUM(&cx->runtime->protoLookupDepthStats, protoIndex);
return protoIndex;
}
}
JSObject *proto = obj->getProto();
if (!proto)
break;
if (!proto->isNative()) {
if (!proto->lookupProperty(cx, id, objp, propp))
return -1;
#ifdef DEBUG
/*
* Non-native objects must have either non-native lookup results,
* or else native results from the non-native's prototype chain.
*
* See JSStackFrame::getValidCalleeObject, where we depend on this
* fact to force a prototype-delegated joined method accessed via
* arguments.callee through the delegating |this| object's method
* read barrier.
*/
if (*propp && (*objp)->isNative()) {
while ((proto = proto->getProto()) != *objp)
JS_ASSERT(proto);
}
#endif
return protoIndex + 1;
}
obj = proto;
}
*objp = NULL;
*propp = NULL;
return protoIndex;
}
JS_FRIEND_API(JSBool)
js_LookupProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
JSProperty **propp)
{
/* Convert string indices to integers if appropriate. */
id = js_CheckForStringIndex(id);
return js_LookupPropertyWithFlagsInline(cx, obj, id, cx->resolveFlags, objp, propp) >= 0;
}
int
js_LookupPropertyWithFlags(JSContext *cx, JSObject *obj, jsid id, uintN flags,
JSObject **objp, JSProperty **propp)
{
/* Convert string indices to integers if appropriate. */
id = js_CheckForStringIndex(id);
return js_LookupPropertyWithFlagsInline(cx, obj, id, flags, objp, propp);
}
PropertyCacheEntry *
js_FindPropertyHelper(JSContext *cx, jsid id, JSBool cacheResult,
JSObject **objp, JSObject **pobjp, JSProperty **propp)
{
JSObject *scopeChain, *obj, *parent, *pobj;
PropertyCacheEntry *entry;
int scopeIndex, protoIndex;
JSProperty *prop;
JS_ASSERT_IF(cacheResult, !JS_ON_TRACE(cx));
scopeChain = &js_GetTopStackFrame(cx)->scopeChain();
/* Scan entries on the scope chain that we can cache across. */
entry = JS_NO_PROP_CACHE_FILL;
obj = scopeChain;
parent = obj->getParent();
for (scopeIndex = 0;
parent
? IsCacheableNonGlobalScope(obj)
: !obj->getOps()->lookupProperty;
++scopeIndex) {
protoIndex =
js_LookupPropertyWithFlags(cx, obj, id, cx->resolveFlags,
&pobj, &prop);
if (protoIndex < 0)
return NULL;
if (prop) {
#ifdef DEBUG
if (parent) {
Class *clasp = obj->getClass();
JS_ASSERT(pobj->isNative());
JS_ASSERT(pobj->getClass() == clasp);
if (clasp == &js_BlockClass) {
/*
* A block instance on the scope chain is immutable and it
* shares its shapes with its compile-time prototype.
*/
JS_ASSERT(pobj == obj);
JS_ASSERT(pobj->isClonedBlock());
JS_ASSERT(protoIndex == 0);
} else {
/* Call and DeclEnvClass objects have no prototypes. */
JS_ASSERT(!obj->getProto());
JS_ASSERT(protoIndex == 0);
}
} else {
JS_ASSERT(obj->isNative());
}
#endif
/*
* We must check if pobj is native as a global object can have
* non-native prototype.
*/
if (cacheResult && pobj->isNative()) {
entry = JS_PROPERTY_CACHE(cx).fill(cx, scopeChain, scopeIndex,
protoIndex, pobj,
(Shape *) prop);
}
SCOPE_DEPTH_ACCUM(&cx->runtime->scopeSearchDepthStats, scopeIndex);
goto out;
}
if (!parent) {
pobj = NULL;
goto out;
}
obj = parent;
parent = obj->getParent();
}
for (;;) {
if (!obj->lookupProperty(cx, id, &pobj, &prop))
return NULL;
if (prop) {
PCMETER(JS_PROPERTY_CACHE(cx).nofills++);
goto out;
}
/*
* We conservatively assume that a resolve hook could mutate the scope
* chain during JSObject::lookupProperty. So we read parent here again.
*/
parent = obj->getParent();
if (!parent) {
pobj = NULL;
break;
}
obj = parent;
}
out:
JS_ASSERT(!!pobj == !!prop);
*objp = obj;
*pobjp = pobj;
*propp = prop;
return entry;
}
/*
* On return, if |*pobjp| is a native object, then |*propp| is a |Shape *|.
* Otherwise, its type and meaning depends on the host object's implementation.
*/
JS_FRIEND_API(JSBool)
js_FindProperty(JSContext *cx, jsid id, JSObject **objp, JSObject **pobjp,
JSProperty **propp)
{
return !!js_FindPropertyHelper(cx, id, false, objp, pobjp, propp);
}
JSObject *
js_FindIdentifierBase(JSContext *cx, JSObject *scopeChain, jsid id)
{
/*
* This function should not be called for a global object or from the
* trace and should have a valid cache entry for native scopeChain.
*/
JS_ASSERT(scopeChain->getParent());
JS_ASSERT(!JS_ON_TRACE(cx));
JSObject *obj = scopeChain;
/*
* Loop over cacheable objects on the scope chain until we find a
* property. We also stop when we reach the global object skipping any
* farther checks or lookups. For details see the JSOP_BINDNAME case of
* js_Interpret.
*
* The test order here matters because IsCacheableNonGlobalScope
* must not be passed a global object (i.e. one with null parent).
*/
for (int scopeIndex = 0;
!obj->getParent() || IsCacheableNonGlobalScope(obj);
scopeIndex++) {
JSObject *pobj;
JSProperty *prop;
int protoIndex = js_LookupPropertyWithFlags(cx, obj, id,
cx->resolveFlags,
&pobj, &prop);
if (protoIndex < 0)
return NULL;
if (prop) {
if (!pobj->isNative()) {
JS_ASSERT(!obj->getParent());
return obj;
}
JS_ASSERT_IF(obj->getParent(), pobj->getClass() == obj->getClass());
#ifdef DEBUG
PropertyCacheEntry *entry =
#endif
JS_PROPERTY_CACHE(cx).fill(cx, scopeChain, scopeIndex, protoIndex, pobj,
(Shape *) prop);
JS_ASSERT(entry);
return obj;
}
JSObject *parent = obj->getParent();
if (!parent)
return obj;
obj = parent;
}
/* Loop until we find a property or reach the global object. */
do {
JSObject *pobj;
JSProperty *prop;
if (!obj->lookupProperty(cx, id, &pobj, &prop))
return NULL;
if (prop)
break;
/*
* We conservatively assume that a resolve hook could mutate the scope
* chain during JSObject::lookupProperty. So we must check if parent is
* not null here even if it wasn't before the lookup.
*/
JSObject *parent = obj->getParent();
if (!parent)
break;
obj = parent;
} while (obj->getParent());
return obj;
}
static JS_ALWAYS_INLINE JSBool
js_NativeGetInline(JSContext *cx, JSObject *receiver, JSObject *obj, JSObject *pobj,
const Shape *shape, uintN getHow, Value *vp)
{
LeaveTraceIfGlobalObject(cx, pobj);
uint32 slot;
int32 sample;
JS_ASSERT(pobj->isNative());
slot = shape->slot;
if (slot != SHAPE_INVALID_SLOT) {
*vp = pobj->nativeGetSlot(slot);
JS_ASSERT(!vp->isMagic());
} else {
vp->setUndefined();
}
if (shape->hasDefaultGetter())
return true;
if (JS_UNLIKELY(shape->isMethod()) && (getHow & JSGET_NO_METHOD_BARRIER)) {
JS_ASSERT(&shape->methodObject() == &vp->toObject());
return true;
}
sample = cx->runtime->propertyRemovals;
{
AutoShapeRooter tvr(cx, shape);
AutoObjectRooter tvr2(cx, pobj);
if (!shape->get(cx, receiver, obj, pobj, vp))
return false;
}
if (pobj->containsSlot(slot) &&
(JS_LIKELY(cx->runtime->propertyRemovals == sample) ||
pobj->nativeContains(*shape))) {
if (!pobj->methodWriteBarrier(cx, *shape, *vp))
return false;
pobj->nativeSetSlot(slot, *vp);
}
return true;
}
JSBool
js_NativeGet(JSContext *cx, JSObject *obj, JSObject *pobj, const Shape *shape, uintN getHow,
Value *vp)
{
return js_NativeGetInline(cx, obj, obj, pobj, shape, getHow, vp);
}
JSBool
js_NativeSet(JSContext *cx, JSObject *obj, const Shape *shape, bool added, bool strict, Value *vp)
{
LeaveTraceIfGlobalObject(cx, obj);
uint32 slot;
int32 sample;
JS_ASSERT(obj->isNative());
slot = shape->slot;
if (slot != SHAPE_INVALID_SLOT) {
JS_ASSERT(obj->containsSlot(slot));
/* If shape has a stub setter, keep obj locked and just store *vp. */
if (shape->hasDefaultSetter()) {
if (!added) {
AbortRecordingIfUnexpectedGlobalWrite(cx, obj, slot);
/* FIXME: This should pass *shape, not slot, but see bug 630354. */
if (!obj->methodWriteBarrier(cx, slot, *vp))
return false;
}
obj->nativeSetSlot(slot, *vp);
return true;
}
} else {
/*
* Allow API consumers to create shared properties with stub setters.
* Such properties effectively function as data descriptors which are
* not writable, so attempting to set such a property should do nothing
* or throw if we're in strict mode.
*/
if (!shape->hasGetterValue() && shape->hasDefaultSetter())
return js_ReportGetterOnlyAssignment(cx);
}
sample = cx->runtime->propertyRemovals;
{
AutoShapeRooter tvr(cx, shape);
if (!shape->set(cx, obj, strict, vp))
return false;
JS_ASSERT_IF(!obj->inDictionaryMode(), shape->slot == slot);
slot = shape->slot;
}
if (obj->containsSlot(slot) &&
(JS_LIKELY(cx->runtime->propertyRemovals == sample) ||
obj->nativeContains(*shape))) {
if (!added) {
AbortRecordingIfUnexpectedGlobalWrite(cx, obj, slot);
if (!obj->methodWriteBarrier(cx, *shape, *vp))
return false;
}
obj->setSlot(slot, *vp);
}
return true;
}
static JS_ALWAYS_INLINE bool
js_GetPropertyHelperWithShapeInline(JSContext *cx, JSObject *obj, JSObject *receiver, jsid id,
uintN getHow, Value *vp,
const Shape **shapeOut, JSObject **holderOut)
{
JSObject *aobj, *obj2;
int protoIndex;
JSProperty *prop;
const Shape *shape;
JS_ASSERT_IF(getHow & JSGET_CACHE_RESULT, !JS_ON_TRACE(cx));
*shapeOut = NULL;
/* Convert string indices to integers if appropriate. */
id = js_CheckForStringIndex(id);
aobj = js_GetProtoIfDenseArray(obj);
/* This call site is hot -- use the always-inlined variant of js_LookupPropertyWithFlags(). */
protoIndex = js_LookupPropertyWithFlagsInline(cx, aobj, id, cx->resolveFlags,
&obj2, &prop);
if (protoIndex < 0)
return JS_FALSE;
*holderOut = obj2;
if (!prop) {
vp->setUndefined();
if (!CallJSPropertyOp(cx, obj->getClass()->getProperty, obj, id, vp))
return JS_FALSE;
PCMETER(getHow & JSGET_CACHE_RESULT && JS_PROPERTY_CACHE(cx).nofills++);
/*
* Give a strict warning if foo.bar is evaluated by a script for an
* object foo with no property named 'bar'.
*/
jsbytecode *pc;
if (vp->isUndefined() && ((pc = js_GetCurrentBytecodePC(cx)) != NULL)) {
JSOp op;
uintN flags;
op = (JSOp) *pc;
if (op == JSOP_TRAP) {
JS_ASSERT_NOT_ON_TRACE(cx);
op = JS_GetTrapOpcode(cx, cx->fp()->script(), pc);
}
if (op == JSOP_GETXPROP) {
flags = JSREPORT_ERROR;
} else {
if (!cx->hasStrictOption() ||
(op != JSOP_GETPROP && op != JSOP_GETELEM) ||
js_CurrentPCIsInImacro(cx)) {
return JS_TRUE;
}
/*
* XXX do not warn about missing __iterator__ as the function
* may be called from JS_GetMethodById. See bug 355145.
*/
if (JSID_IS_ATOM(id, cx->runtime->atomState.iteratorAtom))
return JS_TRUE;
/* Do not warn about tests like (obj[prop] == undefined). */
if (cx->resolveFlags == JSRESOLVE_INFER) {
LeaveTrace(cx);
pc += js_CodeSpec[op].length;
if (Detecting(cx, pc))
return JS_TRUE;
} else if (cx->resolveFlags & JSRESOLVE_DETECTING) {
return JS_TRUE;
}
flags = JSREPORT_WARNING | JSREPORT_STRICT;
}
/* Ok, bad undefined property reference: whine about it. */
if (!js_ReportValueErrorFlags(cx, flags, JSMSG_UNDEFINED_PROP,
JSDVG_IGNORE_STACK, IdToValue(id),
NULL, NULL, NULL)) {
return JS_FALSE;
}
}
return JS_TRUE;
}
if (!obj2->isNative()) {
return obj2->isProxy()
? JSProxy::get(cx, obj2, receiver, id, vp)
: obj2->getProperty(cx, id, vp);
}
shape = (Shape *) prop;
*shapeOut = shape;
if (getHow & JSGET_CACHE_RESULT) {
JS_ASSERT_NOT_ON_TRACE(cx);
JS_PROPERTY_CACHE(cx).fill(cx, aobj, 0, protoIndex, obj2, shape);
}
/* This call site is hot -- use the always-inlined variant of js_NativeGet(). */
if (!js_NativeGetInline(cx, receiver, obj, obj2, shape, getHow, vp))
return JS_FALSE;
return JS_TRUE;
}
bool
js_GetPropertyHelperWithShape(JSContext *cx, JSObject *obj, JSObject *receiver, jsid id,
uint32 getHow, Value *vp,
const Shape **shapeOut, JSObject **holderOut)
{
return js_GetPropertyHelperWithShapeInline(cx, obj, receiver, id, getHow, vp,
shapeOut, holderOut);
}
static JS_ALWAYS_INLINE JSBool
js_GetPropertyHelperInline(JSContext *cx, JSObject *obj, JSObject *receiver, jsid id,
uint32 getHow, Value *vp)
{
const Shape *shape;
JSObject *holder;
return js_GetPropertyHelperWithShapeInline(cx, obj, receiver, id, getHow, vp, &shape, &holder);
}
JSBool
js_GetPropertyHelper(JSContext *cx, JSObject *obj, jsid id, uint32 getHow, Value *vp)
{
return js_GetPropertyHelperInline(cx, obj, obj, id, getHow, vp);
}
JSBool
js_GetProperty(JSContext *cx, JSObject *obj, JSObject *receiver, jsid id, Value *vp)
{
/* This call site is hot -- use the always-inlined variant of js_GetPropertyHelper(). */
return js_GetPropertyHelperInline(cx, obj, receiver, id, JSGET_METHOD_BARRIER, vp);
}
JSBool
js::GetPropertyDefault(JSContext *cx, JSObject *obj, jsid id, const Value &def, Value *vp)
{
JSProperty *prop;
JSObject *obj2;
if (js_LookupPropertyWithFlags(cx, obj, id, JSRESOLVE_QUALIFIED, &obj2, &prop) < 0)
return false;
if (!prop) {
*vp = def;
return true;
}
return js_GetProperty(cx, obj2, id, vp);
}
JSBool
js_GetMethod(JSContext *cx, JSObject *obj, jsid id, uintN getHow, Value *vp)
{
JSAutoResolveFlags rf(cx, JSRESOLVE_QUALIFIED);
PropertyIdOp op = obj->getOps()->getProperty;
if (!op) {
#if JS_HAS_XML_SUPPORT
JS_ASSERT(!obj->isXML());
#endif
return js_GetPropertyHelper(cx, obj, id, getHow, vp);
}
JS_ASSERT_IF(getHow & JSGET_CACHE_RESULT, obj->isDenseArray());
#if JS_HAS_XML_SUPPORT
if (obj->isXML())
return js_GetXMLMethod(cx, obj, id, vp);
#endif
return op(cx, obj, obj, id, vp);
}
JS_FRIEND_API(bool)
js_CheckUndeclaredVarAssignment(JSContext *cx, JSString *propname)
{
JSStackFrame *const fp = js_GetTopStackFrame(cx);
if (!fp)
return true;
/* If neither cx nor the code is strict, then no check is needed. */
if (!(fp->isScriptFrame() && fp->script()->strictModeCode) &&
!cx->hasStrictOption()) {
return true;
}
JSAutoByteString bytes(cx, propname);
return !!bytes &&
JS_ReportErrorFlagsAndNumber(cx,
(JSREPORT_WARNING | JSREPORT_STRICT
| JSREPORT_STRICT_MODE_ERROR),
js_GetErrorMessage, NULL,
JSMSG_UNDECLARED_VAR, bytes.ptr());
}
bool
JSObject::reportReadOnly(JSContext* cx, jsid id, uintN report)
{
return js_ReportValueErrorFlags(cx, report, JSMSG_READ_ONLY,
JSDVG_IGNORE_STACK, IdToValue(id), NULL,
NULL, NULL);
}
bool
JSObject::reportNotConfigurable(JSContext* cx, jsid id, uintN report)
{
return js_ReportValueErrorFlags(cx, report, JSMSG_CANT_DELETE,
JSDVG_IGNORE_STACK, IdToValue(id), NULL,
NULL, NULL);
}
bool
JSObject::reportNotExtensible(JSContext *cx, uintN report)
{
return js_ReportValueErrorFlags(cx, report, JSMSG_OBJECT_NOT_EXTENSIBLE,
JSDVG_IGNORE_STACK, ObjectValue(*this),
NULL, NULL, NULL);
}
bool
JSObject::callMethod(JSContext *cx, jsid id, uintN argc, Value *argv, Value *vp)
{
Value fval;
return js_GetMethod(cx, this, id, JSGET_NO_METHOD_BARRIER, &fval) &&
ExternalInvoke(cx, ObjectValue(*this), fval, argc, argv, vp);
}
JSBool
js_SetPropertyHelper(JSContext *cx, JSObject *obj, jsid id, uintN defineHow,
Value *vp, JSBool strict)
{
int protoIndex;
JSObject *pobj;
JSProperty *prop;
const Shape *shape;
uintN attrs, flags;
intN shortid;
Class *clasp;
PropertyOp getter;
StrictPropertyOp setter;
bool added;
JS_ASSERT((defineHow &
~(JSDNP_CACHE_RESULT | JSDNP_SET_METHOD | JSDNP_UNQUALIFIED)) == 0);
if (defineHow & JSDNP_CACHE_RESULT)
JS_ASSERT_NOT_ON_TRACE(cx);
/* Convert string indices to integers if appropriate. */
id = js_CheckForStringIndex(id);
protoIndex = js_LookupPropertyWithFlags(cx, obj, id, cx->resolveFlags,
&pobj, &prop);
if (protoIndex < 0)
return JS_FALSE;
if (prop) {
if (!pobj->isNative()) {
if (pobj->isProxy()) {
AutoPropertyDescriptorRooter pd(cx);
if (!JSProxy::getPropertyDescriptor(cx, pobj, id, true, &pd))
return false;
if ((pd.attrs & (JSPROP_SHARED | JSPROP_SHADOWABLE)) == JSPROP_SHARED) {
return !pd.setter ||
CallSetter(cx, obj, id, pd.setter, pd.attrs, pd.shortid, strict, vp);
}
if (pd.attrs & JSPROP_READONLY) {
if (strict)
return obj->reportReadOnly(cx, id);
if (cx->hasStrictOption())
return obj->reportReadOnly(cx, id, JSREPORT_STRICT | JSREPORT_WARNING);
return true;
}
}
prop = NULL;
}
} else {
/* We should never add properties to lexical blocks. */
JS_ASSERT(!obj->isBlock());
if (!obj->getParent() &&
(defineHow & JSDNP_UNQUALIFIED) &&
!js_CheckUndeclaredVarAssignment(cx, JSID_TO_STRING(id))) {
return JS_FALSE;
}
}
shape = (Shape *) prop;
/*
* Now either shape is null, meaning id was not found in obj or one of its
* prototypes; or shape is non-null, meaning id was found directly in pobj.
*/
attrs = JSPROP_ENUMERATE;
flags = 0;
shortid = 0;
clasp = obj->getClass();
getter = clasp->getProperty;
setter = clasp->setProperty;
if (shape) {
/* ES5 8.12.4 [[Put]] step 2. */
if (shape->isAccessorDescriptor()) {
if (shape->hasDefaultSetter())
return js_ReportGetterOnlyAssignment(cx);
} else {
JS_ASSERT(shape->isDataDescriptor());
if (!shape->writable()) {
PCMETER((defineHow & JSDNP_CACHE_RESULT) && JS_PROPERTY_CACHE(cx).rofills++);
/* Error in strict mode code, warn with strict option, otherwise do nothing. */
if (strict)
return obj->reportReadOnly(cx, id);
if (cx->hasStrictOption())
return obj->reportReadOnly(cx, id, JSREPORT_STRICT | JSREPORT_WARNING);
return JS_TRUE;
}
}
attrs = shape->attributes();
if (pobj != obj) {
/*
* We found id in a prototype object: prepare to share or shadow.
*/
if (!shape->shadowable()) {
if (defineHow & JSDNP_CACHE_RESULT)
JS_PROPERTY_CACHE(cx).fill(cx, obj, 0, protoIndex, pobj, shape);
if (shape->hasDefaultSetter() && !shape->hasGetterValue())
return JS_TRUE;
return shape->set(cx, obj, strict, vp);
}
/*
* Preserve attrs except JSPROP_SHARED, getter, and setter when
* shadowing any property that has no slot (is shared). We must
* clear the shared attribute for the shadowing shape so that the
* property in obj that it defines has a slot to retain the value
* being set, in case the setter simply cannot operate on instances
* of obj's class by storing the value in some class-specific
* location.
*
* A subset of slotless shared properties is the set of properties
* with shortids, which must be preserved too. An old API requires
* that the property's getter and setter receive the shortid, not
* id, when they are called on the shadowing property that we are
* about to create in obj.
*/
if (!shape->hasSlot()) {
defineHow &= ~JSDNP_SET_METHOD;
if (shape->hasShortID()) {
flags = Shape::HAS_SHORTID;
shortid = shape->shortid;
}
attrs &= ~JSPROP_SHARED;
getter = shape->getter();
setter = shape->setter();
} else {
/* Restore attrs to the ECMA default for new properties. */
attrs = JSPROP_ENUMERATE;
}
/*
* Forget we found the proto-property now that we've copied any
* needed member values.
*/
shape = NULL;
}
JS_ASSERT_IF(shape && shape->isMethod(), pobj->hasMethodBarrier());
JS_ASSERT_IF(shape && shape->isMethod(),
&pobj->getSlot(shape->slot).toObject() == &shape->methodObject());
if (shape && (defineHow & JSDNP_SET_METHOD)) {
/*
* JSOP_SETMETHOD is assigning to an existing own property. If it
* is an identical method property, do nothing. Otherwise downgrade
* to ordinary assignment. Either way, do not fill the property
* cache, as the interpreter has no fast path for these unusual
* cases.
*/
bool identical = shape->isMethod() && &shape->methodObject() == &vp->toObject();
if (!identical) {
shape = obj->methodShapeChange(cx, *shape);
if (!shape)
return false;
JSObject *funobj = &vp->toObject();
JSFunction *fun = funobj->getFunctionPrivate();
if (fun == funobj) {
funobj = CloneFunctionObject(cx, fun, fun->parent);
if (!funobj)
return JS_FALSE;
vp->setObject(*funobj);
}
}
return identical || js_NativeSet(cx, obj, shape, false, strict, vp);
}
}
added = false;
if (!shape) {
if (!obj->isExtensible()) {
/* Error in strict mode code, warn with strict option, otherwise do nothing. */
if (strict)
return obj->reportNotExtensible(cx);
if (cx->hasStrictOption())
return obj->reportNotExtensible(cx, JSREPORT_STRICT | JSREPORT_WARNING);
return JS_TRUE;
}
/*
* Purge the property cache of now-shadowed id in obj's scope chain.
* Do this early, before locking obj to avoid nesting locks.
*/
js_PurgeScopeChain(cx, obj, id);
/* Find or make a property descriptor with the right heritage. */
if (!obj->ensureClassReservedSlots(cx))
return JS_FALSE;
/*
* Check for Object class here to avoid defining a method on a class
* with magic resolve, addProperty, getProperty, etc. hooks.
*/
if ((defineHow & JSDNP_SET_METHOD) && obj->canHaveMethodBarrier()) {
JS_ASSERT(IsFunctionObject(*vp));
JS_ASSERT(!(attrs & (JSPROP_GETTER | JSPROP_SETTER)));
JSObject *funobj = &vp->toObject();
JSFunction *fun = GET_FUNCTION_PRIVATE(cx, funobj);
if (fun == funobj) {
flags |= Shape::METHOD;
getter = CastAsPropertyOp(funobj);
}
}
shape = obj->putProperty(cx, id, getter, setter, SHAPE_INVALID_SLOT,
attrs, flags, shortid);
if (!shape)
return JS_FALSE;
if (defineHow & JSDNP_CACHE_RESULT)
TRACE_1(AddProperty, obj);
/*
* 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 (obj->containsSlot(shape->slot))
obj->nativeSetSlot(shape->slot, UndefinedValue());
/* XXXbe called with obj locked */
if (!CallAddPropertyHook(cx, clasp, obj, shape, vp)) {
obj->removeProperty(cx, id);
return JS_FALSE;
}
added = true;
}
if (defineHow & JSDNP_CACHE_RESULT)
JS_PROPERTY_CACHE(cx).fill(cx, obj, 0, 0, obj, shape, added);
return js_NativeSet(cx, obj, shape, added, strict, vp);
#ifdef JS_TRACER
error: // TRACE_1 jumps here in case of error.
return JS_FALSE;
#endif
}
JSBool
js_SetProperty(JSContext *cx, JSObject *obj, jsid id, Value *vp, JSBool strict)
{
return js_SetPropertyHelper(cx, obj, id, 0, vp, strict);
}
JSBool
js_GetAttributes(JSContext *cx, JSObject *obj, jsid id, uintN *attrsp)
{
JSProperty *prop;
if (!js_LookupProperty(cx, obj, id, &obj, &prop))
return false;
if (!prop) {
*attrsp = 0;
return true;
}
if (!obj->isNative())
return obj->getAttributes(cx, id, attrsp);
const Shape *shape = (Shape *)prop;
*attrsp = shape->attributes();
return true;
}
JSBool
js_SetNativeAttributes(JSContext *cx, JSObject *obj, Shape *shape, uintN attrs)
{
JS_ASSERT(obj->isNative());
return !!js_ChangeNativePropertyAttrs(cx, obj, shape, attrs, 0,
shape->getter(), shape->setter());
}
JSBool
js_SetAttributes(JSContext *cx, JSObject *obj, jsid id, uintN *attrsp)
{
JSProperty *prop;
if (!js_LookupProperty(cx, obj, id, &obj, &prop))
return false;
if (!prop)
return true;
return obj->isNative()
? js_SetNativeAttributes(cx, obj, (Shape *) prop, *attrsp)
: obj->setAttributes(cx, id, attrsp);
}
JSBool
js_DeleteProperty(JSContext *cx, JSObject *obj, jsid id, Value *rval, JSBool strict)
{
JSObject *proto;
JSProperty *prop;
const Shape *shape;
rval->setBoolean(true);
/* Convert string indices to integers if appropriate. */
id = js_CheckForStringIndex(id);
if (!js_LookupProperty(cx, obj, id, &proto, &prop))
return 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 && proto->isNative()) {
shape = (Shape *)prop;
if (shape->isSharedPermanent()) {
if (strict)
return obj->reportNotConfigurable(cx, id);
rval->setBoolean(false);
return 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 CallJSPropertyOp(cx, obj->getClass()->delProperty, obj, id, rval);
}
shape = (Shape *)prop;
if (!shape->configurable()) {
if (strict)
return obj->reportNotConfigurable(cx, id);
rval->setBoolean(false);
return true;
}
if (!CallJSPropertyOp(cx, obj->getClass()->delProperty, obj, SHAPE_USERID(shape), rval))
return false;
if (obj->containsSlot(shape->slot)) {
const Value &v = obj->nativeGetSlot(shape->slot);
GC_POKE(cx, v);
/*
* Delete is rare enough that we can take the hit of checking for an
* active cloned method function object that must be homed to a callee
* slot on the active stack frame before this delete completes, in case
* someone saved the clone and checks it against foo.caller for a foo
* called from the active method.
*
* We do not check suspended frames. They can't be reached via caller,
* so the only way they could have the method's joined function object
* as callee is through an API abusage. We break any such edge case.
*/
if (obj->hasMethodBarrier()) {
JSObject *funobj;
if (IsFunctionObject(v, &funobj)) {
JSFunction *fun = GET_FUNCTION_PRIVATE(cx, funobj);
if (fun != funobj) {
for (JSStackFrame *fp = cx->maybefp(); fp; fp = fp->prev()) {
if (fp->isFunctionFrame() &&
&fp->callee() == &fun->compiledFunObj() &&
fp->thisValue().isObject())
{
JSObject *tmp = &fp->thisValue().toObject();
do {
if (tmp == obj) {
fp->calleeValue().setObject(*funobj);
break;
}
} while ((tmp = tmp->getProto()) != NULL);
}
}
}
}
}
}
return obj->removeProperty(cx, id) && js_SuppressDeletedProperty(cx, obj, id);
}
namespace js {
JSObject *
HasNativeMethod(JSObject *obj, jsid methodid, Native native)
{
const Shape *shape = obj->nativeLookup(methodid);
if (!shape || !shape->hasDefaultGetter() || !obj->containsSlot(shape->slot))
return NULL;
const Value &fval = obj->nativeGetSlot(shape->slot);
JSObject *funobj;
if (!IsFunctionObject(fval, &funobj) || funobj->getFunctionPrivate()->maybeNative() != native)
return NULL;
return funobj;
}
bool
DefaultValue(JSContext *cx, JSObject *obj, JSType hint, Value *vp)
{
JS_ASSERT(hint != JSTYPE_OBJECT && hint != JSTYPE_FUNCTION);
Value v = ObjectValue(*obj);
if (hint == JSTYPE_STRING) {
/* Optimize (new String(...)).toString(). */
if (obj->getClass() == &js_StringClass &&
ClassMethodIsNative(cx, obj,
&js_StringClass,
ATOM_TO_JSID(cx->runtime->atomState.toStringAtom),
js_str_toString)) {
*vp = obj->getPrimitiveThis();
return true;
}
Value fval;
jsid id = ATOM_TO_JSID(cx->runtime->atomState.toStringAtom);
if (!js_GetMethod(cx, obj, id, JSGET_NO_METHOD_BARRIER, &fval))
return false;
if (js_IsCallable(fval)) {
if (!ExternalInvoke(cx, ObjectValue(*obj), fval, 0, NULL, &v))
return false;
if (v.isPrimitive()) {
*vp = v;
return true;
}
}
if (!obj->getClass()->convert(cx, obj, hint, &v))
return false;
} else {
/* Optimize (new String(...)).valueOf(). */
Class *clasp = obj->getClass();
if ((clasp == &js_StringClass &&
ClassMethodIsNative(cx, obj, &js_StringClass,
ATOM_TO_JSID(cx->runtime->atomState.valueOfAtom),
js_str_toString)) ||
(clasp == &js_NumberClass &&
ClassMethodIsNative(cx, obj, &js_NumberClass,
ATOM_TO_JSID(cx->runtime->atomState.valueOfAtom),
js_num_valueOf))) {
*vp = obj->getPrimitiveThis();
return true;
}
if (!obj->getClass()->convert(cx, obj, hint, &v))
return false;
if (v.isObject()) {
JS_ASSERT(hint != TypeOfValue(cx, v));
Value fval;
jsid id = ATOM_TO_JSID(cx->runtime->atomState.toStringAtom);
if (!js_GetMethod(cx, obj, id, JSGET_NO_METHOD_BARRIER, &fval))
return false;
if (js_IsCallable(fval)) {
if (!ExternalInvoke(cx, ObjectValue(*obj), fval, 0, NULL, &v))
return false;
if (v.isPrimitive()) {
*vp = v;
return true;
}
}
}
}
if (v.isObject()) {
/* Avoid recursive death when decompiling in js_ReportValueError. */
JSString *str;
if (hint == JSTYPE_STRING) {
str = JS_InternString(cx, obj->getClass()->name);
if (!str)
return false;
} else {
str = NULL;
}
vp->setObject(*obj);
js_ReportValueError2(cx, JSMSG_CANT_CONVERT_TO,
JSDVG_SEARCH_STACK, *vp, str,
(hint == JSTYPE_VOID)
? "primitive type"
: JS_TYPE_STR(hint));
return false;
}
*vp = v;
return true;
}
} /* namespace js */
JS_FRIEND_API(JSBool)
js_Enumerate(JSContext *cx, JSObject *obj, JSIterateOp enum_op, Value *statep, jsid *idp)
{
/* If the class has a custom JSCLASS_NEW_ENUMERATE hook, call it. */
Class *clasp = obj->getClass();
JSEnumerateOp enumerate = clasp->enumerate;
if (clasp->flags & JSCLASS_NEW_ENUMERATE) {
JS_ASSERT(enumerate != JS_EnumerateStub);
return ((NewEnumerateOp) enumerate)(cx, obj, enum_op, statep, idp);
}
if (!enumerate(cx, obj))
return false;
/* Tell InitNativeIterator to treat us like a native object. */
JS_ASSERT(enum_op == JSENUMERATE_INIT || enum_op == JSENUMERATE_INIT_ALL);
statep->setMagic(JS_NATIVE_ENUMERATE);
return true;
}
namespace js {
JSBool
CheckAccess(JSContext *cx, JSObject *obj, jsid id, JSAccessMode mode,
Value *vp, uintN *attrsp)
{
JSBool writing;
JSObject *pobj;
JSProperty *prop;
Class *clasp;
const Shape *shape;
JSSecurityCallbacks *callbacks;
CheckAccessOp check;
while (JS_UNLIKELY(obj->getClass() == &js_WithClass))
obj = obj->getProto();
writing = (mode & JSACC_WRITE) != 0;
switch (mode & JSACC_TYPEMASK) {
case JSACC_PROTO:
pobj = obj;
if (!writing)
vp->setObjectOrNull(obj->getProto());
*attrsp = JSPROP_PERMANENT;
break;
case JSACC_PARENT:
JS_ASSERT(!writing);
pobj = obj;
vp->setObject(*obj->getParent());
*attrsp = JSPROP_READONLY | JSPROP_PERMANENT;
break;
default:
if (!obj->lookupProperty(cx, id, &pobj, &prop))
return JS_FALSE;
if (!prop) {
if (!writing)
vp->setUndefined();
*attrsp = 0;
pobj = obj;
break;
}
if (!pobj->isNative()) {
if (!writing) {
vp->setUndefined();
*attrsp = 0;
}
break;
}
shape = (Shape *)prop;
*attrsp = shape->attributes();
if (!writing) {
if (pobj->containsSlot(shape->slot))
*vp = pobj->nativeGetSlot(shape->slot);
else
vp->setUndefined();
}
}
/*
* 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 like __proto__, 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 = pobj->getClass();
check = clasp->checkAccess;
if (!check) {
callbacks = JS_GetSecurityCallbacks(cx);
check = callbacks ? Valueify(callbacks->checkObjectAccess) : NULL;
}
return !check || check(cx, pobj, id, mode, vp);
}
}
JSType
js_TypeOf(JSContext *cx, JSObject *obj)
{
return obj->isCallable() ? JSTYPE_FUNCTION : JSTYPE_OBJECT;
}
bool
js_IsDelegate(JSContext *cx, JSObject *obj, const Value &v)
{
if (v.isPrimitive())
return false;
JSObject *obj2 = &v.toObject();
while ((obj2 = obj2->getProto()) != NULL) {
if (obj2 == obj)
return true;
}
return false;
}
bool
js::FindClassPrototype(JSContext *cx, JSObject *scopeobj, JSProtoKey protoKey,
JSObject **protop, Class *clasp)
{
Value v;
if (!js_FindClassObject(cx, scopeobj, protoKey, &v, clasp))
return false;
if (IsFunctionObject(v)) {
JSObject *ctor = &v.toObject();
if (!ctor->getProperty(cx, ATOM_TO_JSID(cx->runtime->atomState.classPrototypeAtom), &v))
return false;
}
*protop = v.isObject() ? &v.toObject() : NULL;
return true;
}
/*
* The first part of this function has been hand-expanded and optimized into
* NewBuiltinClassInstance in jsobjinlines.h.
*/
JSBool
js_GetClassPrototype(JSContext *cx, JSObject *scopeobj, JSProtoKey protoKey,
JSObject **protop, Class *clasp)
{
VOUCH_DOES_NOT_REQUIRE_STACK();
JS_ASSERT(JSProto_Null <= protoKey);
JS_ASSERT(protoKey < JSProto_LIMIT);
if (protoKey != JSProto_Null) {
if (!scopeobj) {
if (cx->hasfp())
scopeobj = &cx->fp()->scopeChain();
if (!scopeobj) {
scopeobj = cx->globalObject;
if (!scopeobj) {
*protop = NULL;
return true;
}
}
}
scopeobj = scopeobj->getGlobal();
if (scopeobj->isGlobal()) {
const Value &v = scopeobj->getReservedSlot(JSProto_LIMIT + protoKey);
if (v.isObject()) {
*protop = &v.toObject();
return true;
}
}
}
return FindClassPrototype(cx, scopeobj, protoKey, protop, clasp);
}
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 (!ctor->defineProperty(cx, ATOM_TO_JSID(cx->runtime->atomState.classPrototypeAtom),
ObjectOrNullValue(proto), PropertyStub, StrictPropertyStub, attrs)) {
return JS_FALSE;
}
/*
* ECMA says that Object.prototype.constructor, or f.prototype.constructor
* for a user-defined function f, is DontEnum.
*/
return proto->defineProperty(cx, ATOM_TO_JSID(cx->runtime->atomState.constructorAtom),
ObjectOrNullValue(ctor), PropertyStub, StrictPropertyStub, 0);
}
JSObject *
PrimitiveToObject(JSContext *cx, const Value &v)
{
if (v.isString()) {
JSObject *obj = NewBuiltinClassInstance(cx, &js_StringClass);
if (!obj || !obj->initString(cx, v.toString()))
return NULL;
return obj;
}
JS_ASSERT(v.isNumber() || v.isBoolean());
Class *clasp = v.isNumber() ? &js_NumberClass : &js_BooleanClass;
JSObject *obj = NewBuiltinClassInstance(cx, clasp);
if (!obj)
return NULL;
obj->setPrimitiveThis(v);
return obj;
}
JSBool
js_PrimitiveToObject(JSContext *cx, Value *vp)
{
JSObject *obj = PrimitiveToObject(cx, *vp);
if (!obj)
return false;
vp->setObject(*obj);
return true;
}
JSBool
js_ValueToObjectOrNull(JSContext *cx, const Value &v, JSObject **objp)
{
JSObject *obj;
if (v.isObjectOrNull()) {
obj = v.toObjectOrNull();
} else if (v.isUndefined()) {
obj = NULL;
} else {
obj = PrimitiveToObject(cx, v);
if (!obj)
return false;
}
*objp = obj;
return true;
}
namespace js {
/* Callers must handle the already-object case . */
JSObject *
ToObjectSlow(JSContext *cx, Value *vp)
{
JS_ASSERT(!vp->isMagic());
JS_ASSERT(!vp->isObject());
if (vp->isNullOrUndefined()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CANT_CONVERT_TO,
vp->isNull() ? "null" : "undefined", "object");
return NULL;
}
JSObject *obj = PrimitiveToObject(cx, *vp);
if (obj)
vp->setObject(*obj);
return obj;
}
}
JSObject *
js_ValueToNonNullObject(JSContext *cx, const Value &v)
{
JSObject *obj;
if (!js_ValueToObjectOrNull(cx, v, &obj))
return NULL;
if (!obj)
js_ReportIsNullOrUndefined(cx, JSDVG_SEARCH_STACK, v, NULL);
return obj;
}
JSBool
js_TryValueOf(JSContext *cx, JSObject *obj, JSType type, Value *rval)
{
Value fval;
jsid id = ATOM_TO_JSID(cx->runtime->atomState.valueOfAtom);
if (!js_GetMethod(cx, obj, id, JSGET_NO_METHOD_BARRIER, &fval))
return false;
if (js_IsCallable(fval)) {
Value v;
Value argv[] = { StringValue(cx->runtime->atomState.typeAtoms[type]) };
if (!ExternalInvoke(cx, ObjectValue(*obj), fval, JS_ARRAY_LENGTH(argv), argv, &v))
return false;
if (v.isPrimitive()) {
*rval = v;
return true;
}
}
return true;
}
#if JS_HAS_XDR
JSBool
js_XDRObject(JSXDRState *xdr, JSObject **objp)
{
JSContext *cx;
JSAtom *atom;
Class *clasp;
uint32 classId, classDef;
JSProtoKey protoKey;
JSObject *proto;
cx = xdr->cx;
atom = NULL;
if (xdr->mode == JSXDR_ENCODE) {
clasp = (*objp)->getClass();
classId = JS_XDRFindClassIdByName(xdr, clasp->name);
classDef = !classId;
if (classDef) {
if (!JS_XDRRegisterClass(xdr, Jsvalify(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_XDRAtom(xdr, &atom))
return JS_FALSE;
if (!JS_XDRUint32(xdr, &classId))
return JS_FALSE;
if (xdr->mode == JSXDR_DECODE) {
if (classDef) {
/* NB: we know that JSProto_Null is 0 here, for backward compat. */
protoKey = (JSProtoKey) (classDef >> 1);
if (!js_GetClassPrototype(cx, NULL, protoKey, &proto, clasp))
return JS_FALSE;
clasp = proto->getClass();
if (!JS_XDRRegisterClass(xdr, Jsvalify(clasp), &classId))
return JS_FALSE;
} else {
clasp = Valueify(JS_XDRFindClassById(xdr, classId));
if (!clasp) {
char numBuf[12];
JS_snprintf(numBuf, sizeof numBuf, "%ld", (long)classId);
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_CANT_FIND_CLASS, numBuf);
return JS_FALSE;
}
}
}
if (!clasp->xdrObject) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_CANT_XDR_CLASS, clasp->name);
return JS_FALSE;
}
return clasp->xdrObject(xdr, objp);
}
#endif /* JS_HAS_XDR */
#ifdef JS_DUMP_SCOPE_METERS
#include <stdio.h>
JSBasicStats js_entry_count_bs = JS_INIT_STATIC_BASIC_STATS;
namespace js {
void
MeterEntryCount(uintN count)
{
JS_BASIC_STATS_ACCUM(&js_entry_count_bs, count);
}
}
void
js_DumpScopeMeters(JSRuntime *rt)
{
static FILE *logfp;
if (!logfp)
logfp = fopen("/tmp/scope.stats", "a");
{
double mean, sigma;
mean = JS_MeanAndStdDevBS(&js_entry_count_bs, &sigma);
fprintf(logfp, "scopes %u entries %g mean %g sigma %g max %u",
js_entry_count_bs.num, js_entry_count_bs.sum, mean, sigma,
js_entry_count_bs.max);
}
JS_DumpHistogram(&js_entry_count_bs, logfp);
JS_BASIC_STATS_INIT(&js_entry_count_bs);
fflush(logfp);
}
#endif
#ifdef DEBUG
void
js_PrintObjectSlotName(JSTracer *trc, char *buf, size_t bufsize)
{
JS_ASSERT(trc->debugPrinter == js_PrintObjectSlotName);
JSObject *obj = (JSObject *)trc->debugPrintArg;
uint32 slot = (uint32)trc->debugPrintIndex;
const Shape *shape;
if (obj->isNative()) {
shape = obj->lastProperty();
while (shape->previous() && shape->slot != slot)
shape = shape->previous();
if (shape->slot != slot)
shape = NULL;
} else {
shape = NULL;
}
if (!shape) {
const char *slotname = NULL;
if (obj->isGlobal()) {
#define JS_PROTO(name,code,init) \
if ((code) == slot) { slotname = js_##name##_str; goto found; }
#include "jsproto.tbl"
#undef JS_PROTO
}
found:
if (slotname)
JS_snprintf(buf, bufsize, "CLASS_OBJECT(%s)", slotname);
else
JS_snprintf(buf, bufsize, "**UNKNOWN SLOT %ld**", (long)slot);
} else {
jsid id = shape->id;
if (JSID_IS_INT(id)) {
JS_snprintf(buf, bufsize, "%ld", (long)JSID_TO_INT(id));
} else if (JSID_IS_ATOM(id)) {
PutEscapedString(buf, bufsize, JSID_TO_ATOM(id), 0);
} else {
JS_snprintf(buf, bufsize, "**FINALIZED ATOM KEY**");
}
}
}
#endif
void
js_ClearNative(JSContext *cx, JSObject *obj)
{
/*
* Clear obj of all obj's properties. FIXME: we do not clear reserved slots
* lying below JSSLOT_FREE(clasp). JS_ClearScope does that.
*/
if (!obj->nativeEmpty()) {
/* Now that we're done using real properties, clear obj. */
obj->clear(cx);
/* Clear slot values since obj->clear reset our shape to empty. */
uint32 freeslot = JSSLOT_FREE(obj->getClass());
uint32 n = obj->numSlots();
for (uint32 i = freeslot; i < n; ++i)
obj->setSlot(i, UndefinedValue());
}
}
bool
js_GetReservedSlot(JSContext *cx, JSObject *obj, uint32 slot, Value *vp)
{
if (!obj->isNative()) {
vp->setUndefined();
return true;
}
if (slot < obj->numSlots())
*vp = obj->getSlot(slot);
else
vp->setUndefined();
return true;
}
bool
js_SetReservedSlot(JSContext *cx, JSObject *obj, uint32 slot, const Value &v)
{
if (!obj->isNative())
return true;
Class *clasp = obj->getClass();
if (slot >= obj->numSlots()) {
uint32 nslots = JSSLOT_FREE(clasp);
JS_ASSERT(slot < nslots);
if (!obj->allocSlots(cx, nslots))
return false;
}
obj->setSlot(slot, v);
GC_POKE(cx, JS_NULL);
return true;
}
JSObject *
JSObject::getGlobal() const
{
JSObject *obj = const_cast<JSObject *>(this);
while (JSObject *parent = obj->getParent())
obj = parent;
return obj;
}
JSBool
js_ReportGetterOnlyAssignment(JSContext *cx)
{
return JS_ReportErrorFlagsAndNumber(cx,
JSREPORT_WARNING | JSREPORT_STRICT |
JSREPORT_STRICT_MODE_ERROR,
js_GetErrorMessage, NULL,
JSMSG_GETTER_ONLY);
}
JS_FRIEND_API(JSBool)
js_GetterOnlyPropertyStub(JSContext *cx, JSObject *obj, jsid id, JSBool strict, jsval *vp)
{
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_GETTER_ONLY);
return JS_FALSE;
}
#ifdef DEBUG
/*
* Routines to print out values during debugging. These are FRIEND_API to help
* the debugger find them and to support temporarily hacking js_Dump* calls
* into other code.
*/
void
dumpChars(const jschar *s, size_t n)
{
size_t i;
if (n == (size_t) -1) {
while (s[++n]) ;
}
fputc('"', stderr);
for (i = 0; i < n; i++) {
if (s[i] == '\n')
fprintf(stderr, "\\n");
else if (s[i] == '\t')
fprintf(stderr, "\\t");
else if (s[i] >= 32 && s[i] < 127)
fputc(s[i], stderr);
else if (s[i] <= 255)
fprintf(stderr, "\\x%02x", (unsigned int) s[i]);
else
fprintf(stderr, "\\u%04x", (unsigned int) s[i]);
}
fputc('"', stderr);
}
JS_FRIEND_API(void)
js_DumpChars(const jschar *s, size_t n)
{
fprintf(stderr, "jschar * (%p) = ", (void *) s);
dumpChars(s, n);
fputc('\n', stderr);
}
void
dumpString(JSString *str)
{
if (const jschar *chars = str->getChars(NULL))
dumpChars(chars, str->length());
else
fprintf(stderr, "(oom in dumpString)");
}
JS_FRIEND_API(void)
js_DumpString(JSString *str)
{
if (const jschar *chars = str->getChars(NULL)) {
fprintf(stderr, "JSString* (%p) = jschar * (%p) = ",
(void *) str, (void *) chars);
dumpString(str);
} else {
fprintf(stderr, "(oom in JS_DumpString)");
}
fputc('\n', stderr);
}
JS_FRIEND_API(void)
js_DumpAtom(JSAtom *atom)
{
fprintf(stderr, "JSAtom* (%p) = ", (void *) atom);
js_DumpString(atom);
}
void
dumpValue(const Value &v)
{
if (v.isNull())
fprintf(stderr, "null");
else if (v.isUndefined())
fprintf(stderr, "undefined");
else if (v.isInt32())
fprintf(stderr, "%d", v.toInt32());
else if (v.isDouble())
fprintf(stderr, "%g", v.toDouble());
else if (v.isString())
dumpString(v.toString());
else if (v.isObject() && v.toObject().isFunction()) {
JSObject *funobj = &v.toObject();
JSFunction *fun = GET_FUNCTION_PRIVATE(cx, funobj);
if (fun->atom) {
fputs("<function ", stderr);
FileEscapedString(stderr, fun->atom, 0);
} else {
fputs("<unnamed function", stderr);
}
if (fun->isInterpreted()) {
JSScript *script = fun->script();
fprintf(stderr, " (%s:%u)",
script->filename ? script->filename : "", script->lineno);
}
fprintf(stderr, " at %p (JSFunction at %p)>", (void *) funobj, (void *) fun);
} else if (v.isObject()) {
JSObject *obj = &v.toObject();
Class *clasp = obj->getClass();
fprintf(stderr, "<%s%s at %p>",
clasp->name,
(clasp == &js_ObjectClass) ? "" : " object",
(void *) obj);
} else if (v.isBoolean()) {
if (v.toBoolean())
fprintf(stderr, "true");
else
fprintf(stderr, "false");
} else if (v.isMagic()) {
fprintf(stderr, "<invalid");
#ifdef DEBUG
switch (v.whyMagic()) {
case JS_ARRAY_HOLE: fprintf(stderr, " array hole"); break;
case JS_ARGS_HOLE: fprintf(stderr, " args hole"); break;
case JS_NATIVE_ENUMERATE: fprintf(stderr, " native enumeration"); break;
case JS_NO_ITER_VALUE: fprintf(stderr, " no iter value"); break;
case JS_GENERATOR_CLOSING: fprintf(stderr, " generator closing"); break;
default: fprintf(stderr, " ?!"); break;
}
#endif
fprintf(stderr, ">");
} else {
fprintf(stderr, "unexpected value");
}
}
JS_FRIEND_API(void)
js_DumpValue(const Value &val)
{
dumpValue(val);
fputc('\n', stderr);
}
JS_FRIEND_API(void)
js_DumpId(jsid id)
{
fprintf(stderr, "jsid %p = ", (void *) JSID_BITS(id));
dumpValue(IdToValue(id));
fputc('\n', stderr);
}
static void
DumpProperty(JSObject *obj, const Shape &shape)
{
jsid id = shape.id;
uint8 attrs = shape.attributes();
fprintf(stderr, " ((Shape *) %p) ", (void *) &shape);
if (attrs & JSPROP_ENUMERATE) fprintf(stderr, "enumerate ");
if (attrs & JSPROP_READONLY) fprintf(stderr, "readonly ");
if (attrs & JSPROP_PERMANENT) fprintf(stderr, "permanent ");
if (attrs & JSPROP_SHARED) fprintf(stderr, "shared ");
if (shape.isAlias()) fprintf(stderr, "alias ");
if (shape.isMethod()) fprintf(stderr, "method=%p ", (void *) &shape.methodObject());
if (shape.hasGetterValue())
fprintf(stderr, "getterValue=%p ", (void *) shape.getterObject());
else if (!shape.hasDefaultGetter())
fprintf(stderr, "getterOp=%p ", JS_FUNC_TO_DATA_PTR(void *, shape.getterOp()));
if (shape.hasSetterValue())
fprintf(stderr, "setterValue=%p ", (void *) shape.setterObject());
else if (shape.setterOp() == js_watch_set)
fprintf(stderr, "setterOp=js_watch_set ");
else if (!shape.hasDefaultSetter())
fprintf(stderr, "setterOp=%p ", JS_FUNC_TO_DATA_PTR(void *, shape.setterOp()));
if (JSID_IS_ATOM(id))
dumpString(JSID_TO_STRING(id));
else if (JSID_IS_INT(id))
fprintf(stderr, "%d", (int) JSID_TO_INT(id));
else
fprintf(stderr, "unknown jsid %p", (void *) JSID_BITS(id));
fprintf(stderr, ": slot %d", shape.slot);
if (obj->containsSlot(shape.slot)) {
fprintf(stderr, " = ");
dumpValue(obj->getSlot(shape.slot));
} else if (shape.slot != SHAPE_INVALID_SLOT) {
fprintf(stderr, " (INVALID!)");
}
fprintf(stderr, "\n");
}
JS_FRIEND_API(void)
js_DumpObject(JSObject *obj)
{
fprintf(stderr, "object %p\n", (void *) obj);
Class *clasp = obj->getClass();
fprintf(stderr, "class %p %s\n", (void *)clasp, clasp->name);
fprintf(stderr, "flags:");
uint32 flags = obj->flags;
if (flags & JSObject::DELEGATE) fprintf(stderr, " delegate");
if (flags & JSObject::SYSTEM) fprintf(stderr, " system");
if (flags & JSObject::NOT_EXTENSIBLE) fprintf(stderr, " not_extensible");
if (flags & JSObject::BRANDED) fprintf(stderr, " branded");
if (flags & JSObject::GENERIC) fprintf(stderr, " generic");
if (flags & JSObject::METHOD_BARRIER) fprintf(stderr, " method_barrier");
if (flags & JSObject::INDEXED) fprintf(stderr, " indexed");
if (flags & JSObject::OWN_SHAPE) fprintf(stderr, " own_shape");
if (flags & JSObject::HAS_EQUALITY) fprintf(stderr, " has_equality");
bool anyFlags = flags != 0;
if (obj->isNative()) {
if (obj->inDictionaryMode()) {
fprintf(stderr, " inDictionaryMode");
anyFlags = true;
}
if (obj->hasPropertyTable()) {
fprintf(stderr, " hasPropertyTable");
anyFlags = true;
}
}
if (!anyFlags)
fprintf(stderr, " none");
fprintf(stderr, "\n");
if (obj->isDenseArray()) {
unsigned slots = JS_MIN(obj->getArrayLength(), obj->getDenseArrayCapacity());
fprintf(stderr, "elements\n");
for (unsigned i = 0; i < slots; i++) {
fprintf(stderr, " %3d: ", i);
dumpValue(obj->getDenseArrayElement(i));
fprintf(stderr, "\n");
fflush(stderr);
}
return;
}
fprintf(stderr, "proto ");
dumpValue(ObjectOrNullValue(obj->getProto()));
fputc('\n', stderr);
fprintf(stderr, "parent ");
dumpValue(ObjectOrNullValue(obj->getParent()));
fputc('\n', stderr);
if (clasp->flags & JSCLASS_HAS_PRIVATE)
fprintf(stderr, "private %p\n", obj->getPrivate());
if (!obj->isNative())
fprintf(stderr, "not native\n");
unsigned reservedEnd = JSCLASS_RESERVED_SLOTS(clasp);
unsigned slots = obj->slotSpan();
unsigned stop = obj->isNative() ? reservedEnd : slots;
if (stop > 0)
fprintf(stderr, obj->isNative() ? "reserved slots:\n" : "slots:\n");
for (unsigned i = 0; i < stop; i++) {
fprintf(stderr, " %3d ", i);
if (i < reservedEnd)
fprintf(stderr, "(reserved) ");
fprintf(stderr, "= ");
dumpValue(obj->getSlot(i));
fputc('\n', stderr);
}
if (obj->isNative()) {
fprintf(stderr, "properties:\n");
Vector<const Shape *, 8, SystemAllocPolicy> props;
for (Shape::Range r = obj->lastProperty()->all(); !r.empty(); r.popFront())
props.append(&r.front());
for (size_t i = props.length(); i-- != 0;)
DumpProperty(obj, *props[i]);
}
fputc('\n', stderr);
}
static void
MaybeDumpObject(const char *name, JSObject *obj)
{
if (obj) {
fprintf(stderr, " %s: ", name);
dumpValue(ObjectValue(*obj));
fputc('\n', stderr);
}
}
static void
MaybeDumpValue(const char *name, const Value &v)
{
if (!v.isNull()) {
fprintf(stderr, " %s: ", name);
dumpValue(v);
fputc('\n', stderr);
}
}
JS_FRIEND_API(void)
js_DumpStackFrame(JSContext *cx, JSStackFrame *start)
{
/* This should only called during live debugging. */
VOUCH_DOES_NOT_REQUIRE_STACK();
if (!start)
start = cx->maybefp();
FrameRegsIter i(cx);
while (!i.done() && i.fp() != start)
++i;
if (i.done()) {
fprintf(stderr, "fp = %p not found in cx = %p\n", (void *)start, (void *)cx);
return;
}
for (; !i.done(); ++i) {
JSStackFrame *const fp = i.fp();
fprintf(stderr, "JSStackFrame at %p\n", (void *) fp);
if (fp->isFunctionFrame()) {
fprintf(stderr, "callee fun: ");
dumpValue(ObjectValue(fp->callee()));
} else {
fprintf(stderr, "global frame, no callee");
}
fputc('\n', stderr);
if (fp->isScriptFrame()) {
fprintf(stderr, "file %s line %u\n",
fp->script()->filename, (unsigned) fp->script()->lineno);
}
if (jsbytecode *pc = i.pc()) {
if (!fp->isScriptFrame()) {
fprintf(stderr, "*** pc && !script, skipping frame\n\n");
continue;
}
if (fp->hasImacropc()) {
fprintf(stderr, " pc in imacro at %p\n called from ", pc);
pc = fp->imacropc();
} else {
fprintf(stderr, " ");
}
fprintf(stderr, "pc = %p\n", pc);
fprintf(stderr, " current op: %s\n", js_CodeName[*pc]);
}
Value *sp = i.sp();
fprintf(stderr, " slots: %p\n", (void *) fp->slots());
fprintf(stderr, " sp: %p = slots + %u\n", (void *) sp, (unsigned) (sp - fp->slots()));
if (sp - fp->slots() < 10000) { // sanity
for (Value *p = fp->slots(); p < sp; p++) {
fprintf(stderr, " %p: ", (void *) p);
dumpValue(*p);
fputc('\n', stderr);
}
}
if (fp->hasArgs()) {
fprintf(stderr, " actuals: %p (%u) ", (void *) fp->actualArgs(), (unsigned) fp->numActualArgs());
fprintf(stderr, " formals: %p (%u)\n", (void *) fp->formalArgs(), (unsigned) fp->numFormalArgs());
}
if (fp->hasCallObj()) {
fprintf(stderr, " has call obj: ");
dumpValue(ObjectValue(fp->callObj()));
fprintf(stderr, "\n");
}
MaybeDumpObject("argsobj", fp->maybeArgsObj());
if (!fp->isDummyFrame()) {
MaybeDumpValue("this", fp->thisValue());
fprintf(stderr, " rval: ");
dumpValue(fp->returnValue());
} else {
fprintf(stderr, "dummy frame");
}
fputc('\n', stderr);
fprintf(stderr, " flags:");
if (fp->isConstructing())
fprintf(stderr, " constructing");
if (fp->hasOverriddenArgs())
fprintf(stderr, " overridden_args");
if (fp->isAssigning())
fprintf(stderr, " assigning");
if (fp->isDebuggerFrame())
fprintf(stderr, " debugger");
if (fp->isEvalFrame())
fprintf(stderr, " eval");
if (fp->isYielding())
fprintf(stderr, " yielding");
if (fp->isGeneratorFrame())
fprintf(stderr, " generator");
fputc('\n', stderr);
fprintf(stderr, " scopeChain: (JSObject *) %p\n", (void *) &fp->scopeChain());
fputc('\n', stderr);
}
}
#endif /* DEBUG */
