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2aeb294c19
gecko/js/src/jsobj.cpp
Brian Hackett 2aeb294c19 Interface for JSStackFrame.argc, bug 586533. r=lw
2010-08-19 16:44:12 -07:00

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199 KiB
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/* -*- 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" /* Added by JSIFY */
#include "jsbit.h"
#include "jsutil.h" /* Added by JSIFY */
#include "jshash.h" /* Added by JSIFY */
#include "jsdhash.h"
#include "jsprf.h"
#include "jsapi.h"
#include "jsarray.h"
#include "jsatom.h"
#include "jsbool.h"
#include "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 "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 "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 "jsdtracef.h"
#include "jsatominlines.h"
#include "jsobjinlines.h"
#include "jsscriptinlines.h"
#include "jsautooplen.h"
using namespace js;
JS_FRIEND_DATA(const JSObjectMap) JSObjectMap::sharedNonNative(JSObjectMap::SHAPELESS);
Class js_ObjectClass = {
js_Object_str,
JSCLASS_HAS_CACHED_PROTO(JSProto_Object) |
JSCLASS_FAST_CONSTRUCTOR,
PropertyStub, /* addProperty */
PropertyStub, /* delProperty */
PropertyStub, /* getProperty */
PropertyStub, /* 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, 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, Value *vp)
{
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()) {
JSScopeProperty *sprop = (JSScopeProperty *) prop;
hasGetter = sprop->hasGetterValue();
hasSetter = sprop->hasSetterValue();
if (hasGetter)
v.set(sprop->getterValue());
if (hasSetter)
setter.set(sprop->setterValue());
JS_UNLOCK_OBJ(cx, obj2);
} 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)
{
JS_CALL_OBJECT_TRACER((JSTracer *)arg, (JSObject *)he->key,
"sharp table entry");
return JS_DHASH_NEXT;
}
void
js_TraceSharpMap(JSTracer *trc, JSSharpObjectMap *map)
{
JS_ASSERT(map->depth > 0);
JS_ASSERT(map->table);
/*
* During recursive calls to MarkSharpObjects a non-native object or
* object with a custom getProperty method can potentially return an
* unrooted value or even cut from the object graph an argument of one of
* MarkSharpObjects recursive invocations. So we must protect map->table
* entries against GC.
*
* We can not simply use JSTempValueRooter to mark the obj argument of
* MarkSharpObjects during recursion as we have to protect *all* entries
* in JSSharpObjectMap including those that contains otherwise unreachable
* objects just allocated through custom getProperty. Otherwise newer
* allocations can re-use the address of an object stored in the hashtable
* confusing js_EnterSharpObject. So to address the problem we simply
* mark all objects from map->table.
*
* An alternative "proper" solution is to use JSTempValueRooter in
* MarkSharpObjects with code to remove during finalization entries
* with otherwise unreachable objects. But this is way too complex
* to justify spending efforts.
*/
JS_HashTableEnumerateEntries(map->table, gc_sharp_table_entry_marker, trc);
}
#if JS_HAS_TOSOURCE
static JSBool
obj_toSource(JSContext *cx, uintN argc, Value *vp)
{
JSBool ok, outermost;
JSObject *obj;
JSHashEntry *he;
JSIdArray *ida;
jschar *chars, *ochars, *vsharp;
const jschar *idstrchars, *vchars;
size_t nchars, idstrlength, gsoplength, vlength, vsharplength, curlen;
const char *comma;
JSObject *obj2;
JSProperty *prop;
Value *val;
JSString *gsop[2];
JSString *idstr, *valstr, *str;
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. */
outermost = (cx->sharpObjectMap.depth == 0);
obj = ComputeThisFromVp(cx, vp);
if (!obj || !(he = js_EnterSharpObject(cx, obj, &ida, &chars))) {
ok = JS_FALSE;
goto out;
}
if (IS_SHARP(he)) {
/*
* We didn't enter -- obj is already "sharp", meaning we've visited it
* already in our depth first search, and therefore chars contains a
* string of the form "#n#".
*/
JS_ASSERT(!ida);
#if JS_HAS_SHARP_VARS
nchars = js_strlen(chars);
#else
chars[0] = '{';
chars[1] = '}';
chars[2] = 0;
nchars = 2;
#endif
goto make_string;
}
JS_ASSERT(ida);
ok = JS_TRUE;
if (!chars) {
/* If outermost, allocate 4 + 1 for "({})" and the terminator. */
chars = (jschar *) js_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 *)
js_realloc((ochars = chars), (nchars + 2 + 1) * sizeof(jschar));
if (!chars) {
js_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.
*/
idstr = js_ValueToString(cx, IdToValue(id));
if (!idstr) {
ok = JS_FALSE;
obj2->dropProperty(cx, prop);
goto error;
}
vp->setString(idstr); /* local root */
jsint valcnt = 0;
if (prop) {
bool doGet = true;
if (obj2->isNative()) {
JSScopeProperty *sprop = (JSScopeProperty *) prop;
unsigned attrs = sprop->attributes();
if (attrs & JSPROP_GETTER) {
doGet = false;
val[valcnt] = sprop->getterValue();
gsop[valcnt] = ATOM_TO_STRING(cx->runtime->atomState.getAtom);
valcnt++;
}
if (attrs & JSPROP_SETTER) {
doGet = false;
val[valcnt] = sprop->setterValue();
gsop[valcnt] = ATOM_TO_STRING(cx->runtime->atomState.setAtom);
valcnt++;
}
JS_UNLOCK_OBJ(cx, obj2);
}
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)) {
idstr = js_QuoteString(cx, idstr, jschar('\''));
if (!idstr) {
ok = JS_FALSE;
goto error;
}
vp->setString(idstr); /* local root */
}
idstr->getCharsAndLength(idstrchars, idstrlength);
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 */
valstr->getCharsAndLength(vchars, vlength);
/*
* 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 *) js_realloc((ochars = chars), curlen * sizeof(jschar));
if (!chars) {
/* Save code space on error: let JS_free ignore null vsharp. */
cx->free(vsharp);
js_free(ochars);
goto error;
}
if (comma) {
chars[nchars++] = comma[0];
chars[nchars++] = comma[1];
}
comma = ", ";
if (gsop[j]) {
gsoplength = gsop[j]->length();
js_strncpy(&chars[nchars], gsop[j]->chars(),
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)
js_free(chars);
goto out;
}
if (!chars) {
JS_ReportOutOfMemory(cx);
ok = JS_FALSE;
goto out;
}
make_string:
str = js_NewString(cx, chars, nchars);
if (!str) {
js_free(chars);
ok = JS_FALSE;
goto out;
}
vp->setString(str);
ok = JS_TRUE;
out:
return ok;
overflow:
cx->free(vsharp);
js_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->wrappedObject(cx)->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;
}
}
static JSBool
obj_toString(JSContext *cx, uintN argc, Value *vp)
{
JSObject *obj = ComputeThisFromVp(cx, vp);
if (!obj)
return false;
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)
{
if (!ComputeThisFromVp(cx, vp))
return JS_FALSE;
JSString *str = js_ValueToString(cx, vp[1]);
if (!str)
return JS_FALSE;
vp->setString(str);
return JS_TRUE;
}
static JSBool
obj_valueOf(JSContext *cx, uintN argc, Value *vp)
{
if (!ComputeThisFromVp(cx, vp))
return JS_FALSE;
*vp = vp[1];
return JS_TRUE;
}
/*
* Check if CSP allows new Function() or eval() to run in the current
* principals.
*/
JSBool
js_CheckContentSecurityPolicy(JSContext *cx)
{
JSSecurityCallbacks *callbacks = JS_GetSecurityCallbacks(cx);
// if there are callbacks, make sure that the CSP callback is installed and
// that it permits eval().
if (callbacks && callbacks->contentSecurityPolicyAllows)
return callbacks->contentSecurityPolicyAllows(cx);
return JS_TRUE;
}
/*
* Check whether principals subsumes scopeobj's principals, and return true
* if so (or if scopeobj has no principals, for backward compatibility with
* the JS API, which does not require principals), and false otherwise.
*/
JSBool
js_CheckPrincipalsAccess(JSContext *cx, JSObject *scopeobj,
JSPrincipals *principals, JSAtom *caller)
{
JSSecurityCallbacks *callbacks;
JSPrincipals *scopePrincipals;
const char *callerstr;
callbacks = JS_GetSecurityCallbacks(cx);
if (callbacks && callbacks->findObjectPrincipals) {
scopePrincipals = callbacks->findObjectPrincipals(cx, scopeobj);
if (!principals || !scopePrincipals ||
!principals->subsume(principals, scopePrincipals)) {
callerstr = js_AtomToPrintableString(cx, caller);
if (!callerstr)
return JS_FALSE;
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_BAD_INDIRECT_CALL, callerstr);
return JS_FALSE;
}
}
return JS_TRUE;
}
static JSObject *
CheckScopeChainValidity(JSContext *cx, JSObject *scopeobj, const char *caller)
{
JSObject *inner;
if (!scopeobj)
goto bad;
OBJ_TO_INNER_OBJECT(cx, scopeobj);
if (!scopeobj)
return NULL;
/* XXX This is an awful gross hack. */
inner = scopeobj;
while (scopeobj) {
JSObjectOp op = scopeobj->getClass()->ext.innerObject;
if (op && op(cx, scopeobj) != scopeobj)
goto bad;
scopeobj = scopeobj->getParent();
}
return inner;
bad:
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_BAD_INDIRECT_CALL, caller);
return NULL;
}
const char *
js_ComputeFilename(JSContext *cx, JSStackFrame *caller,
JSPrincipals *principals, uintN *linenop)
{
uint32 flags;
#ifdef DEBUG
JSSecurityCallbacks *callbacks = JS_GetSecurityCallbacks(cx);
#endif
JS_ASSERT(principals || !(callbacks && callbacks->findObjectPrincipals));
flags = JS_GetScriptFilenameFlags(caller->getScript());
if ((flags & JSFILENAME_PROTECTED) &&
principals &&
strcmp(principals->codebase, "[System Principal]")) {
*linenop = 0;
return principals->codebase;
}
jsbytecode *pc = caller->pc(cx);
if (pc && js_GetOpcode(cx, caller->getScript(), pc) == JSOP_EVAL) {
JS_ASSERT(js_GetOpcode(cx, caller->getScript(), pc + JSOP_EVAL_LENGTH) == JSOP_LINENO);
*linenop = GET_UINT16(pc + JSOP_EVAL_LENGTH);
} else {
*linenop = js_FramePCToLineNumber(cx, caller);
}
return caller->getScript()->filename;
}
#ifndef EVAL_CACHE_CHAIN_LIMIT
# define EVAL_CACHE_CHAIN_LIMIT 4
#endif
static inline JSScript **
EvalCacheHash(JSContext *cx, JSString *str)
{
const jschar *s;
size_t n;
uint32 h;
str->getCharsAndLength(s, n);
if (n > 100)
n = 100;
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 JSBool
obj_eval(JSContext *cx, uintN argc, Value *vp)
{
if (argc < 1) {
vp->setUndefined();
return JS_TRUE;
}
JSStackFrame *caller = js_GetScriptedCaller(cx, NULL);
if (!caller) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_BAD_INDIRECT_CALL, js_eval_str);
return JS_FALSE;
}
jsbytecode *callerPC = caller->pc(cx);
bool indirectCall = (callerPC && *callerPC != JSOP_EVAL);
/*
* This call to JSObject::wrappedObject is safe because of the security
* checks we do below. However, the control flow below is confusing, so we
* double check. There are two cases:
* - Direct call: This object is never used. So unwrapping can't hurt.
* - Indirect call: If this object isn't already the scope chain (which
* we're guaranteed to be allowed to access) then we do a security
* check.
*/
Value *argv = JS_ARGV(cx, vp);
JSObject *obj = ComputeThisFromVp(cx, vp);
if (!obj)
return JS_FALSE;
obj = obj->wrappedObject(cx);
OBJ_TO_INNER_OBJECT(cx, obj);
if (!obj)
return JS_FALSE;
/*
* Ban indirect uses of eval (nonglobal.eval = eval; nonglobal.eval(....))
* that attempt to use a non-global object as the scope object.
*/
{
JSObject *parent = obj->getParent();
if (indirectCall || parent) {
uintN flags = parent
? JSREPORT_ERROR
: JSREPORT_STRICT | JSREPORT_WARNING;
if (!JS_ReportErrorFlagsAndNumber(cx, flags, js_GetErrorMessage, NULL,
JSMSG_BAD_INDIRECT_CALL,
js_eval_str)) {
return JS_FALSE;
}
}
}
if (!argv[0].isString()) {
*vp = argv[0];
return JS_TRUE;
}
/*
* 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.
*/
if (argc > 1 && !caller->getScript()->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 JS_FALSE;
caller->getScript()->warnedAboutTwoArgumentEval = true;
}
/* From here on, control must exit through label out with ok set. */
MUST_FLOW_THROUGH("out");
uintN staticLevel = caller->getScript()->staticLevel + 1;
/*
* Bring fp->scopeChain up to date. We're either going to use
* it (direct call) or save it and restore it (indirect call).
*/
JSObject *callerScopeChain = js_GetScopeChain(cx, caller);
if (!callerScopeChain)
return JS_FALSE;
JSObject *scopeobj = NULL;
#if JS_HAS_EVAL_THIS_SCOPE
/*
* If we see an indirect call, then run eval in the global scope. We do
* this so the compiler can make assumptions about what bindings may or
* may not exist in the current frame if it doesn't see 'eval'.
*/
if (indirectCall) {
/* Pretend that we're top level. */
staticLevel = 0;
if (!js_CheckPrincipalsAccess(cx, obj,
JS_StackFramePrincipals(cx, caller),
cx->runtime->atomState.evalAtom)) {
return JS_FALSE;
}
/* NB: We know inner is a global object here. */
JS_ASSERT(!obj->getParent());
scopeobj = obj;
} else {
/*
* Compile using the caller's current scope object.
*
* NB: This means that the C API must not be used to call eval.
*/
JS_ASSERT_IF(caller->argv, caller->hasCallObj());
scopeobj = callerScopeChain;
}
#endif
/* Ensure we compile this eval with the right object in the scope chain. */
JSObject *result = CheckScopeChainValidity(cx, scopeobj, js_eval_str);
JS_ASSERT_IF(result, result == scopeobj);
if (!result)
return JS_FALSE;
// CSP check: is eval() allowed at all?
// report errors via CSP is done in the script security mgr.
if (!js_CheckContentSecurityPolicy(cx)) {
JS_ReportError(cx, "call to eval() blocked by CSP");
return JS_FALSE;
}
JSObject *callee = &vp[0].toObject();
JSPrincipals *principals = js_EvalFramePrincipals(cx, callee, caller);
uintN line;
const char *file = js_ComputeFilename(cx, caller, principals, &line);
JSString *str = argv[0].toString();
JSScript *script = NULL;
/*
* 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. Scripts produced by
* calls to eval from global code are not cached.
*/
JSScript **bucket = EvalCacheHash(cx, str);
if (!indirectCall && caller->hasFunction()) {
uintN count = 0;
JSScript **scriptp = bucket;
EVAL_CACHE_METER(probe);
while ((script = *scriptp) != NULL) {
if (script->savedCallerFun &&
script->staticLevel == staticLevel &&
script->version == cx->version &&
(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->getFunction()) {
/*
* Get the source string passed for safekeeping in the
* atom map by the prior eval to Compiler::compileScript.
*/
JSString *src = ATOM_TO_STRING(script->atomMap.vector[0]);
if (src == str || js_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 (script->regexpsOffset != 0) {
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;
break;
}
}
}
}
if (++count == EVAL_CACHE_CHAIN_LIMIT) {
script = NULL;
break;
}
EVAL_CACHE_METER(step);
scriptp = &script->u.nextToGC;
}
}
/*
* We can't have a callerFrame (down in js_Execute's terms) if we're in
* global code. This includes indirect eval and direct eval called with a
* scope object parameter.
*/
JSStackFrame *callerFrame = (staticLevel != 0) ? caller : NULL;
if (!script) {
script = Compiler::compileScript(cx, scopeobj, callerFrame,
principals,
TCF_COMPILE_N_GO | TCF_NEED_MUTABLE_SCRIPT,
str->chars(), str->length(),
NULL, file, line, str, staticLevel);
if (!script)
return JS_FALSE;
}
/*
* 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);
script->u.nextToGC = *bucket;
*bucket = script;
#ifdef CHECK_SCRIPT_OWNER
script->owner = NULL;
#endif
return ok;
}
#if JS_HAS_OBJ_WATCHPOINT
static JSBool
obj_watch_handler(JSContext *cx, JSObject *obj, jsid id, jsval old,
jsval *nvp, void *closure)
{
JSObject *callable;
JSSecurityCallbacks *callbacks;
JSStackFrame *caller;
JSPrincipals *subject, *watcher;
JSResolvingKey key;
JSResolvingEntry *entry;
uint32 generation;
Value argv[3];
JSBool ok;
callable = (JSObject *) closure;
callbacks = JS_GetSecurityCallbacks(cx);
if (callbacks && callbacks->findObjectPrincipals) {
/* Skip over any obj_watch_* frames between us and the real subject. */
caller = js_GetScriptedCaller(cx, NULL);
if (caller) {
/*
* Only call the watch handler if the watcher is allowed to watch
* the currently executing script.
*/
watcher = callbacks->findObjectPrincipals(cx, callable);
subject = JS_StackFramePrincipals(cx, caller);
if (watcher && subject && !watcher->subsume(watcher, subject)) {
/* Silently don't call the watch handler. */
return JS_TRUE;
}
}
}
/* Avoid recursion on (obj, id) already being watched on cx. */
key.obj = obj;
key.id = id;
if (!js_StartResolving(cx, &key, JSRESFLAG_WATCH, &entry))
return JS_FALSE;
if (!entry)
return JS_TRUE;
generation = cx->resolvingTable->generation;
argv[0] = IdToValue(id);
argv[1] = Valueify(old);
argv[2] = Valueify(*nvp);
ok = InternalCall(cx, obj, ObjectOrNullValue(callable), 3, argv, Valueify(nvp));
js_StopResolving(cx, &key, JSRESFLAG_WATCH, entry, generation);
return ok;
}
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 = ComputeThisFromVp(cx, vp);
Value tmp;
uintN attrs;
if (!obj || !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 = ComputeThisFromVp(cx, vp);
if (!obj)
return JS_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 = ComputeThisFromVp(cx, vp);
return obj &&
js_HasOwnPropertyHelper(cx, obj->getOps()->lookupProperty, argc, vp);
}
JSBool
js_HasOwnPropertyHelper(JSContext *cx, JSLookupPropOp lookup, uintN argc,
Value *vp)
{
jsid id;
if (!ValueToId(cx, argc != 0 ? vp[2] : UndefinedValue(), &id))
return JS_FALSE;
JSObject *obj = ComputeThisFromVp(cx, vp);
JSObject *obj2;
JSProperty *prop;
if (!obj)
return false;
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;
if (prop) {
vp->setBoolean(true);
obj2->dropProperty(cx, prop);
} else {
vp->setBoolean(false);
}
return JS_TRUE;
}
JSBool
js_HasOwnProperty(JSContext *cx, JSLookupPropOp 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.
*/
JSScopeProperty *sprop = reinterpret_cast<JSScopeProperty *>(*propp);
if (sprop->isSharedPermanent())
return true;
}
(*objp)->dropProperty(cx, *propp);
*propp = NULL;
}
return true;
}
/* Proposed ECMA 15.2.4.6. */
static JSBool
obj_isPrototypeOf(JSContext *cx, uintN argc, Value *vp)
{
JSObject *obj = ComputeThisFromVp(cx, vp);
if (!obj)
return JS_FALSE;
const Value &v = argc != 0 ? vp[2] : UndefinedValue();
vp->setBoolean(js_IsDelegate(cx, obj, v));
return JS_TRUE;
}
/* Proposed ECMA 15.2.4.7. */
static JSBool
obj_propertyIsEnumerable(JSContext *cx, uintN argc, Value *vp)
{
jsid id;
if (!ValueToId(cx, argc != 0 ? vp[2] : UndefinedValue(), &id))
return JS_FALSE;
JSObject *obj = ComputeThisFromVp(cx, vp);
return obj && 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()) {
JSScopeProperty *sprop = (JSScopeProperty *) prop;
shared = sprop->isSharedPermanent();
attrs = sprop->attributes();
JS_UNLOCK_OBJ(cx, pobj);
} 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 (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;
JSObject *obj = ComputeThisFromVp(cx, vp);
if (!obj || !CheckRedeclaration(cx, obj, id, JSPROP_GETTER, NULL, NULL))
return JS_FALSE;
/*
* Getters and setters are just like watchpoints from an access
* control point of view.
*/
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, PropertyStub,
JSPROP_ENUMERATE | JSPROP_GETTER | JSPROP_SHARED);
}
JS_FRIEND_API(JSBool)
js_obj_defineSetter(JSContext *cx, uintN argc, Value *vp)
{
if (argc <= 1 || !js_IsCallable(vp[3])) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_BAD_GETTER_OR_SETTER,
js_setter_str);
return JS_FALSE;
}
PropertyOp setter = CastAsPropertyOp(&vp[3].toObject());
jsid id;
if (!ValueToId(cx, vp[2], &id))
return JS_FALSE;
JSObject *obj = ComputeThisFromVp(cx, vp);
if (!obj || !CheckRedeclaration(cx, obj, id, JSPROP_SETTER, NULL, NULL))
return JS_FALSE;
/*
* Getters and setters are just like watchpoints from an access
* control point of view.
*/
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 = ComputeThisFromVp(cx, vp);
JSObject *pobj;
JSProperty *prop;
if (!obj || !obj->lookupProperty(cx, id, &pobj, &prop))
return JS_FALSE;
vp->setUndefined();
if (prop) {
if (pobj->isNative()) {
JSScopeProperty *sprop = (JSScopeProperty *) prop;
if (sprop->hasGetterValue())
*vp = sprop->getterValue();
JS_UNLOCK_OBJ(cx, pobj);
}
}
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 = ComputeThisFromVp(cx, vp);
JSObject *pobj;
JSProperty *prop;
if (!obj || !obj->lookupProperty(cx, id, &pobj, &prop))
return JS_FALSE;
vp->setUndefined();
if (prop) {
if (pobj->isNative()) {
JSScopeProperty *sprop = (JSScopeProperty *) prop;
if (sprop->hasSetterValue())
*vp = sprop->setterValue();
JS_UNLOCK_OBJ(cx, pobj);
}
}
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, PropertyStub, JSPROP_ENUMERATE) ||
!desc->defineProperty(cx, ATOM_TO_JSID(atomState.setAtom), setter,
PropertyStub, PropertyStub, JSPROP_ENUMERATE)) {
return false;
}
} else {
if (!desc->defineProperty(cx, ATOM_TO_JSID(atomState.valueAtom), value,
PropertyStub, PropertyStub, JSPROP_ENUMERATE) ||
!desc->defineProperty(cx, ATOM_TO_JSID(atomState.writableAtom),
BooleanValue((attrs & JSPROP_READONLY) == 0),
PropertyStub, PropertyStub, JSPROP_ENUMERATE)) {
return false;
}
}
return desc->defineProperty(cx, ATOM_TO_JSID(atomState.enumerableAtom),
BooleanValue((attrs & JSPROP_ENUMERATE) != 0),
PropertyStub, PropertyStub, JSPROP_ENUMERATE) &&
desc->defineProperty(cx, ATOM_TO_JSID(atomState.configurableAtom),
BooleanValue((attrs & JSPROP_PERMANENT) == 0),
PropertyStub, PropertyStub, JSPROP_ENUMERATE);
}
JSBool
js_GetOwnPropertyDescriptor(JSContext *cx, JSObject *obj, jsid id, Value *vp)
{
if (obj->isProxy()) {
if (!JSProxy::getOwnPropertyDescriptor(cx, obj, id, vp))
return false;
}
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()) {
JSScopeProperty *sprop = (JSScopeProperty *) prop;
attrs = sprop->attributes();
if (attrs & (JSPROP_GETTER | JSPROP_SETTER)) {
doGet = false;
if (attrs & JSPROP_GETTER)
roots[0] = sprop->getterValue();
if (attrs & JSPROP_SETTER)
roots[1] = sprop->setterValue();
}
JS_UNLOCK_OBJ(cx, pobj);
} 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.isPrimitive()) {
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 JS_FALSE;
AutoIdVector props(cx);
if (!GetPropertyNames(cx, obj, JSITER_OWNONLY, props))
return JS_FALSE;
AutoValueVector vals(cx);
vals.resize(props.length());
for (size_t i = 0, len = props.length(); i < len; i++) {
jsid id = props[i];
if (JSID_IS_STRING(id)) {
vals[i].setString(JSID_TO_STRING(id));
} else {
JS_ASSERT(JSID_IS_INT(id));
JSString *str = js_IntToString(cx, JSID_TO_INT(id));
if (!str)
return JS_FALSE;
vals[i].setString(str);
}
}
JS_ASSERT(props.length() <= UINT32_MAX);
JSObject *aobj = js_NewArrayObject(cx, jsuint(vals.length()), vals.begin());
if (!aobj)
return JS_FALSE;
vp->setObject(*aobj);
return JS_TRUE;
}
static JSBool
HasProperty(JSContext* cx, JSObject* obj, jsid id, Value* vp, JSBool* answerp)
{
if (!JS_HasPropertyById(cx, obj, id, answerp))
return JS_FALSE;
if (!*answerp) {
vp->setUndefined();
return JS_TRUE;
}
return JS_GetPropertyById(cx, obj, id, Jsvalify(vp));
}
PropDesc::PropDesc()
: pd(UndefinedValue()),
id(INT_TO_JSID(0)),
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, jsid id, const Value &origval)
{
Value v = origval;
this->id = id;
/* 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;
JSBool hasProperty;
/* 8.10.5 step 3 */
if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.enumerableAtom), &v,
&hasProperty)) {
return false;
}
if (hasProperty) {
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,
&hasProperty)) {
return false;
}
if (hasProperty) {
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, &hasProperty))
return false;
if (hasProperty) {
hasValue = true;
value = v;
}
/* 8.10.6 step 6 */
if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.writableAtom), &v, &hasProperty))
return false;
if (hasProperty) {
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, &hasProperty))
return false;
if (hasProperty) {
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, &hasProperty))
return false;
if (hasProperty) {
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;
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, errorNumber,
JS_GetStringBytes(JSID_TO_STRING(idstr)));
return JS_FALSE;
}
*rval = false;
return JS_TRUE;
}
static JSBool
Reject(JSContext *cx, uintN errorNumber, bool throwError, bool *rval)
{
if (throwError) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, errorNumber);
return JS_FALSE;
}
*rval = false;
return JS_TRUE;
}
static JSBool
Reject(JSContext *cx, JSObject *obj, JSProperty *prop, uintN errorNumber, bool throwError,
jsid id, bool *rval)
{
obj->dropProperty(cx, prop);
return Reject(cx, errorNumber, throwError, id, rval);
}
static JSBool
DefinePropertyOnObject(JSContext *cx, JSObject *obj, 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, desc.id, &obj2, &current))
return JS_FALSE;
JS_ASSERT(!obj->getOps()->defineProperty);
/* 8.12.9 steps 2-4. */
JSScope *scope = obj->scope();
if (!current) {
if (scope->sealed())
return Reject(cx, JSMSG_OBJECT_NOT_EXTENSIBLE, throwError, rval);
*rval = true;
if (desc.isGenericDescriptor() || desc.isDataDescriptor()) {
JS_ASSERT(!obj->getOps()->defineProperty);
return js_DefineProperty(cx, obj, desc.id, &desc.value,
PropertyStub, PropertyStub, 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, desc.id, JSACC_WATCH, &dummy, &dummyAttrs))
return JS_FALSE;
Value tmp = UndefinedValue();
return js_DefineProperty(cx, obj, desc.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 JSScopeProperty cast below
* to be safe.
*/
JS_ASSERT(obj->getClass() == obj2->getClass());
JSScopeProperty *sprop = reinterpret_cast<JSScopeProperty *>(current);
do {
if (desc.isAccessorDescriptor()) {
if (!sprop->isAccessorDescriptor())
break;
if (desc.hasGet &&
!SameValue(desc.getterValue(), sprop->getterOrUndefined(), cx)) {
break;
}
if (desc.hasSet &&
!SameValue(desc.setterValue(), sprop->setterOrUndefined(), cx)) {
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 (sprop->isDataDescriptor()) {
/*
* Non-standard: if the property is non-configurable and is
* represented by a native getter or setter, don't permit
* redefinition. We expose properties with native getter/setter
* as though they were data properties, for the most part, but
* in this particular case we must worry about integrity
* concerns for JSAPI users who expected that
* permanent+getter/setter means precisely controlled behavior.
* If we permitted such redefinitions, such a property could be
* "fixed" to some specific previous value, no longer varying
* according to the intent of the native getter/setter for the
* property.
*
* Other engines expose properties of this nature using ECMA
* getter/setter pairs, but we can't because we use them even
* for properties which ECMA specifies as being true data
* descriptors ([].length, Function.length, /regex/.lastIndex,
* &c.). Longer-term perhaps we should convert such properties
* to use data descriptors (at which point representing a
* descriptor with native getter/setter as an accessor
* descriptor would be fine) and take a small memory hit, but
* for now we'll simply forbid their redefinition.
*/
if (!sprop->configurable() &&
(!sprop->hasDefaultGetter() || !sprop->hasDefaultSetter())) {
return Reject(cx, obj2, current, JSMSG_CANT_REDEFINE_UNCONFIGURABLE_PROP,
throwError, desc.id, rval);
}
if (!js_NativeGet(cx, obj, obj2, sprop, JSGET_NO_METHOD_BARRIER, &v)) {
/* current was dropped when the failure occurred. */
return JS_FALSE;
}
}
if (desc.isDataDescriptor()) {
if (!sprop->isDataDescriptor())
break;
if (desc.hasValue && !SameValue(desc.value, v, cx))
break;
if (desc.hasWritable && desc.writable() != sprop->writable())
break;
} else {
/* The only fields in desc will be handled below. */
JS_ASSERT(desc.isGenericDescriptor());
}
}
if (desc.hasConfigurable && desc.configurable() != sprop->configurable())
break;
if (desc.hasEnumerable && desc.enumerable() != sprop->enumerable())
break;
/* The conditions imposed by step 5 or step 6 apply. */
obj2->dropProperty(cx, current);
*rval = true;
return JS_TRUE;
} while (0);
/* 8.12.9 step 7. */
if (!sprop->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() != sprop->enumerable())) {
return Reject(cx, obj2, current, JSMSG_CANT_REDEFINE_UNCONFIGURABLE_PROP, throwError,
desc.id, rval);
}
}
if (desc.isGenericDescriptor()) {
/* 8.12.9 step 8, no validation required */
} else if (desc.isDataDescriptor() != sprop->isDataDescriptor()) {
/* 8.12.9 step 9. */
if (!sprop->configurable()) {
return Reject(cx, obj2, current, JSMSG_CANT_REDEFINE_UNCONFIGURABLE_PROP,
throwError, desc.id, rval);
}
} else if (desc.isDataDescriptor()) {
/* 8.12.9 step 10. */
JS_ASSERT(sprop->isDataDescriptor());
if (!sprop->configurable() && !sprop->writable()) {
if ((desc.hasWritable && desc.writable()) ||
(desc.hasValue && !SameValue(desc.value, v, cx))) {
return Reject(cx, obj2, current, JSMSG_CANT_REDEFINE_UNCONFIGURABLE_PROP,
throwError, desc.id, rval);
}
}
} else {
/* 8.12.9 step 11. */
JS_ASSERT(desc.isAccessorDescriptor() && sprop->isAccessorDescriptor());
if (!sprop->configurable()) {
if ((desc.hasSet &&
!SameValue(desc.setterValue(), sprop->setterOrUndefined(), cx)) ||
(desc.hasGet &&
!SameValue(desc.getterValue(), sprop->getterOrUndefined(), cx))) {
return Reject(cx, obj2, current, JSMSG_CANT_REDEFINE_UNCONFIGURABLE_PROP,
throwError, desc.id, rval);
}
}
}
/* 8.12.9 step 12. */
uintN attrs;
PropertyOp getter, setter;
if (desc.isGenericDescriptor()) {
uintN changed = 0;
if (desc.hasConfigurable)
changed |= JSPROP_PERMANENT;
if (desc.hasEnumerable)
changed |= JSPROP_ENUMERATE;
attrs = (sprop->attributes() & ~changed) | (desc.attrs & changed);
if (sprop->isMethod()) {
JS_ASSERT(!(attrs & (JSPROP_GETTER | JSPROP_SETTER)));
getter = setter = PropertyStub;
} else {
getter = sprop->getter();
setter = sprop->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) | (sprop->attributes() & unchanged);
getter = setter = PropertyStub;
} 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, desc.id, JSACC_WATCH, &dummy, &attrs)) {
obj2->dropProperty(cx, current);
return JS_FALSE;
}
JS_ASSERT_IF(sprop->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) | (sprop->attributes() & ~changed);
if (desc.hasGet) {
getter = desc.getter();
} else {
getter = (sprop->isMethod() || (sprop->hasDefaultGetter() && !sprop->hasGetterValue()))
? PropertyStub
: sprop->getter();
}
if (desc.hasSet) {
setter = desc.setter();
} else {
setter = (sprop->hasDefaultSetter() && !sprop->hasSetterValue())
? PropertyStub
: sprop->setter();
}
}
*rval = true;
obj2->dropProperty(cx, current);
return js_DefineProperty(cx, obj, desc.id, &v, getter, setter, attrs);
}
static JSBool
DefinePropertyOnArray(JSContext *cx, JSObject *obj, 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(desc.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_DEFINE_ARRAY_LENGTH_UNSUPPORTED);
return JS_FALSE;
}
uint32 index;
if (js_IdIsIndex(desc.id, &index)) {
/*
// Disabled until we support defining "length":
if (index >= oldLen && lengthPropertyNotWritable())
return ThrowTypeError(cx, JSMSG_CANT_APPEND_PROPERTIES_TO_UNWRITABLE_LENGTH_ARRAY);
*/
if (!DefinePropertyOnObject(cx, obj, desc, false, rval))
return JS_FALSE;
if (!*rval)
return Reject(cx, 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, desc, throwError, rval);
}
static JSBool
DefineProperty(JSContext *cx, JSObject *obj, const PropDesc &desc, bool throwError,
bool *rval)
{
if (obj->isArray())
return DefinePropertyOnArray(cx, obj, desc, throwError, rval);
if (obj->getOps()->lookupProperty) {
if (obj->isProxy())
return JSProxy::defineProperty(cx, obj, desc.id, desc.pd);
return Reject(cx, JSMSG_OBJECT_NOT_EXTENSIBLE, throwError, rval);
}
return DefinePropertyOnObject(cx, obj, 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, id, descriptor))
return false;
bool rval;
if (!DefineProperty(cx, obj, *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)
{
AutoIdArray ida(cx, JS_Enumerate(cx, props));
if (!ida)
return false;
AutoPropDescArrayRooter descs(cx);
size_t len = ida.length();
for (size_t i = 0; i < len; i++) {
jsid id = ida[i];
PropDesc* desc = descs.append();
AutoValueRooter tvr(cx);
if (!desc ||
!JS_GetPropertyById(cx, props, id, tvr.jsval_addr()) ||
!desc->initialize(cx, id, tvr.value())) {
return false;
}
}
bool dummy;
for (size_t i = 0; i < len; i++) {
if (!DefineProperty(cx, obj, 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)
{
/* 15.2.3.6 steps 1 and 5. */
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.defineProperties", &obj))
return false;
vp->setObject(*obj);
if (argc < 2) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_MORE_ARGS_NEEDED,
"Object.defineProperties", "0", "s");
return false;
}
JSObject* props = js_ValueToNonNullObject(cx, vp[3]);
if (!props)
return false;
vp[3].setObject(*props);
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;
}
JSObject *props = &vp[3].toObject();
AutoIdArray ida(cx, JS_Enumerate(cx, props));
if (!ida)
return JS_FALSE;
AutoPropDescArrayRooter descs(cx);
size_t len = ida.length();
for (size_t i = 0; i < len; i++) {
jsid id = ida[i];
PropDesc *desc = descs.append();
if (!desc || !JS_GetPropertyById(cx, props, id, Jsvalify(&vp[1])) ||
!desc->initialize(cx, id, vp[1])) {
return JS_FALSE;
}
}
bool dummy;
for (size_t i = 0; i < len; i++) {
if (!DefineProperty(cx, obj, descs[i], true, &dummy))
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 = js_NewArrayObject(cx, vals.length(), vals.begin());
if (!aobj)
return false;
vp->setObject(*aobj);
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_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());
obj = NewBuiltinClassInstance(cx, &js_ObjectClass);
if (!obj)
return JS_FALSE;
}
vp->setObject(*obj);
return JS_TRUE;
}
#ifdef JS_TRACER
JSObject*
js_NewObjectWithClassProto(JSContext *cx, Class *clasp, JSObject *proto,
const Value &privateSlotValue)
{
JS_ASSERT(clasp->isNative());
JSObject* obj = js_NewGCObject(cx);
if (!obj)
return NULL;
obj->initSharingEmptyScope(clasp, proto, proto->getParent(), privateSlotValue);
return obj;
}
JSObject* FASTCALL
js_Object_tn(JSContext* cx, JSObject* proto)
{
JS_ASSERT(!(js_ObjectClass.flags & JSCLASS_HAS_PRIVATE));
return js_NewObjectWithClassProto(cx, &js_ObjectClass, proto, UndefinedValue());
}
JS_DEFINE_TRCINFO_1(js_Object,
(2, (extern, CONSTRUCTOR_RETRY, js_Object_tn, CONTEXT, CALLEE_PROTOTYPE, 0,
nanojit::ACCSET_STORE_ANY)))
JSObject* FASTCALL
js_NonEmptyObject(JSContext* cx, JSObject* proto)
{
JS_ASSERT(!(js_ObjectClass.flags & JSCLASS_HAS_PRIVATE));
JSObject *obj = js_NewObjectWithClassProto(cx, &js_ObjectClass, proto, UndefinedValue());
if (!obj)
return NULL;
JS_LOCK_OBJ(cx, obj);
JSScope *scope = js_GetMutableScope(cx, obj);
if (!scope) {
JS_UNLOCK_OBJ(cx, obj);
return NULL;
}
/*
* See comments in the JSOP_NEWINIT case of jsinterp.cpp why we cannot
* assume that cx owns the scope and skip the unlock call.
*/
JS_UNLOCK_SCOPE(cx, scope);
return obj;
}
JS_DEFINE_CALLINFO_2(extern, CONSTRUCTOR_RETRY, js_NonEmptyObject, CONTEXT, CALLEE_PROTOTYPE, 0,
nanojit::ACCSET_STORE_ANY)
JSObject* FASTCALL
js_NewInstance(JSContext *cx, Class *clasp, JSObject *ctor)
{
JS_ASSERT(JS_ON_TRACE(cx));
JS_ASSERT(ctor->isFunction());
JSAtom *atom = cx->runtime->atomState.classPrototypeAtom;
JSScope *scope = ctor->scope();
#ifdef JS_THREADSAFE
if (scope->title.ownercx != cx)
return NULL;
#endif
if (scope->isSharedEmpty()) {
scope = js_GetMutableScope(cx, ctor);
if (!scope)
return NULL;
}
JSScopeProperty *sprop = scope->lookup(ATOM_TO_JSID(atom));
Value pval = sprop ? ctor->getSlot(sprop->slot) : MagicValue(JS_GENERIC_MAGIC);
JSObject *parent = ctor->getParent();
JSObject *proto;
if (pval.isObject()) {
/* An object in ctor.prototype, let's use it as the new instance's proto. */
proto = &pval.toObject();
} else {
/* A hole or a primitive: either way, we need to get Object.prototype. */
if (!js_GetClassPrototype(cx, parent, JSProto_Object, &proto))
return NULL;
if (pval.isMagic(JS_GENERIC_MAGIC)) {
/*
* No ctor.prototype was set, so we inline-expand and optimize
* fun_resolve's prototype creation code.
*/
proto = NewNativeClassInstance(cx, clasp, proto, parent);
if (!proto)
return NULL;
if (!js_SetClassPrototype(cx, ctor, proto, JSPROP_ENUMERATE | JSPROP_PERMANENT))
return NULL;
} else {
/*
* A primitive value in .prototype means to use Object.prototype
* for proto. See ES5 13.2.2 step 7.
*/
}
}
/*
* FIXME: 561785 at least. Quasi-natives including XML objects prevent us
* from easily or unconditionally calling NewNativeClassInstance here.
*/
return NewNonFunction<WithProto::Given>(cx, clasp, proto, parent);
}
JS_DEFINE_CALLINFO_3(extern, CONSTRUCTOR_RETRY, js_NewInstance, CONTEXT, CLASS, OBJECT, 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->getScript();
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_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 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->getScript(), pc)];
format = cs->format;
if (JOF_MODE(format) != JOF_NAME)
flags |= JSRESOLVE_QUALIFIED;
if ((format & (JOF_SET | JOF_FOR)) ||
(fp->flags & JSFRAME_ASSIGNING)) {
flags |= JSRESOLVE_ASSIGNING;
} else if (cs->length >= 0) {
pc += cs->length;
if (pc < cx->fp->getScript()->code + cx->fp->getScript()->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, jsid id, Value *vp)
{
return obj->getProto()->getProperty(cx, id, vp);
}
static JSBool
with_SetProperty(JSContext *cx, JSObject *obj, jsid id, Value *vp)
{
return obj->getProto()->setProperty(cx, id, vp);
}
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)
{
return obj->getProto()->deleteProperty(cx, id, rval);
}
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 */
PropertyStub, /* setProperty */
EnumerateStub,
ResolveStub,
ConvertStub,
NULL, /* finalize */
NULL, /* reserved */
NULL, /* checkAccess */
NULL, /* call */
NULL, /* construct */
NULL, /* xdrObject */
NULL, /* hasInstance */
NULL, /* mark */
JS_NULL_CLASS_EXT,
{
with_LookupProperty,
NULL, /* defineProperty */
with_GetProperty,
with_SetProperty,
with_GetAttributes,
with_SetAttributes,
with_DeleteProperty,
with_Enumerate,
with_TypeOf,
NULL, /* trace */
with_ThisObject,
NULL, /* clear */
}
};
JS_REQUIRES_STACK JSObject *
js_NewWithObject(JSContext *cx, JSObject *proto, JSObject *parent, jsint depth)
{
JSObject *obj;
obj = js_NewGCObject(cx);
if (!obj)
return NULL;
obj->init(&js_WithClass, proto, parent,
PrivateValue(js_FloatingFrameIfGenerator(cx, cx->fp)));
OBJ_SET_BLOCK_DEPTH(cx, obj, depth);
obj->map = cx->runtime->emptyWithScope->hold();
AutoObjectRooter tvr(cx, obj);
JSObject *thisp = proto->thisObject(cx);
if (!thisp)
return NULL;
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);
if (!blockObj)
return NULL;
blockObj->init(&js_BlockClass, NULL, NULL, NullValue());
blockObj->map = cx->runtime->emptyBlockScope->hold();
return blockObj;
}
JSObject *
js_CloneBlockObject(JSContext *cx, JSObject *proto, JSStackFrame *fp)
{
JS_ASSERT(!OBJ_IS_CLONED_BLOCK(proto));
JS_ASSERT(proto->getClass() == &js_BlockClass);
JSObject *clone = js_NewGCObject(cx);
if (!clone)
return NULL;
Value privateValue = PrivateValue(js_FloatingFrameIfGenerator(cx, fp));
/* The caller sets parent on its own. */
clone->init(&js_BlockClass, proto, NULL, privateValue);
clone->fslots[JSSLOT_BLOCK_DEPTH] = proto->fslots[JSSLOT_BLOCK_DEPTH];
JS_ASSERT(cx->runtime->emptyBlockScope->freeslot == JSSLOT_BLOCK_DEPTH + 1);
clone->map = cx->runtime->emptyBlockScope->hold();
JS_ASSERT(OBJ_IS_CLONED_BLOCK(clone));
if (!js_EnsureReservedSlots(cx, clone, OBJ_BLOCK_COUNT(cx, proto)))
return NULL;
return clone;
}
JS_REQUIRES_STACK JSBool
js_PutBlockObject(JSContext *cx, JSBool normalUnwind)
{
/* Blocks have one fixed slot available for the first local.*/
JS_STATIC_ASSERT(JS_INITIAL_NSLOTS == JSSLOT_BLOCK_DEPTH + 2);
JSStackFrame *const fp = cx->fp;
JSObject *obj = fp->getScopeChain();
JS_ASSERT(obj->getClass() == &js_BlockClass);
JS_ASSERT(obj->getPrivate() == js_FloatingFrameIfGenerator(cx, cx->fp));
JS_ASSERT(OBJ_IS_CLONED_BLOCK(obj));
/*
* Block objects should never be exposed to scripts. Thus the clone should
* not own the property map and rather always share it with the prototype
* object. This allows us to skip updating obj->scope()->freeslot after
* we copy the stack slots into reserved slots.
*/
JS_ASSERT(obj->scope()->object != obj);
/* 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);
depth += fp->getFixedCount();
obj->fslots[JSSLOT_BLOCK_DEPTH + 1] = fp->slots()[depth];
if (normalUnwind && count > 1) {
--count;
memcpy(obj->dslots, fp->slots() + depth + 1, count * sizeof(Value));
}
/* We must clear the private slot even with errors. */
obj->setPrivate(NULL);
fp->setScopeChain(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->getClass() == &js_BlockClass);
JS_ASSERT(OBJ_IS_CLONED_BLOCK(obj));
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->getFixedCount() + OBJ_BLOCK_DEPTH(cx, obj);
JS_ASSERT(index < fp->getSlotCount());
*vp = fp->slots()[index];
return true;
}
/* Values are in reserved slots immediately following DEPTH. */
uint32 slot = JSSLOT_BLOCK_DEPTH + 1 + index;
JS_LOCK_OBJ(cx, obj);
JS_ASSERT(slot < obj->numSlots());
*vp = obj->getSlot(slot);
JS_UNLOCK_OBJ(cx, obj);
return true;
}
static JSBool
block_setProperty(JSContext *cx, JSObject *obj, jsid id, Value *vp)
{
JS_ASSERT(obj->getClass() == &js_BlockClass);
JS_ASSERT(OBJ_IS_CLONED_BLOCK(obj));
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->getFixedCount() + OBJ_BLOCK_DEPTH(cx, obj);
JS_ASSERT(index < fp->getSlotCount());
fp->slots()[index] = *vp;
return true;
}
/* Values are in reserved slots immediately following DEPTH. */
uint32 slot = JSSLOT_BLOCK_DEPTH + 1 + index;
JS_LOCK_OBJ(cx, obj);
JS_ASSERT(slot < obj->numSlots());
obj->setSlot(slot, *vp);
JS_UNLOCK_OBJ(cx, obj);
return true;
}
JSBool
js_DefineBlockVariable(JSContext *cx, JSObject *obj, jsid id, intN index)
{
JS_ASSERT(obj->getClass() == &js_BlockClass);
JS_ASSERT(!OBJ_IS_CLONED_BLOCK(obj));
/* Use JSPROP_ENUMERATE to aid the disassembler. */
return js_DefineNativeProperty(cx, obj, id, UndefinedValue(),
block_getProperty,
block_setProperty,
JSPROP_ENUMERATE | JSPROP_PERMANENT | JSPROP_SHARED,
JSScopeProperty::HAS_SHORTID, index, NULL);
}
static size_t
GetObjectSize(JSObject *obj)
{
return (obj->isFunction() && !obj->getPrivate())
? sizeof(JSFunction)
: sizeof(JSObject);
}
/*
* 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.
*/
void
JSObject::swap(JSObject *other)
{
/* For both objects determine whether they own their respective scopes. */
bool thisOwns = this->isNative() && scope()->object == this;
bool otherOwns = other->isNative() && other->scope()->object == other;
size_t size = GetObjectSize(this);
JS_ASSERT(size == GetObjectSize(other));
/* Trade the guts of the objects. */
char tmp[tl::Max<sizeof(JSFunction), sizeof(JSObject)>::result];
memcpy(tmp, this, size);
memcpy(this, other, size);
memcpy(other, tmp, size);
/* Fixup scope ownerships. */
if (otherOwns)
scope()->object = this;
if (thisOwns)
other->scope()->object = other;
}
#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;
uint16 depth, count, i;
uint32 tmp;
JSScopeProperty *sprop;
jsid propid;
JSAtom *atom;
int16 shortid;
JSBool ok;
cx = xdr->cx;
#ifdef __GNUC__
obj = NULL; /* quell GCC overwarning */
#endif
if (xdr->mode == JSXDR_ENCODE) {
obj = *objp;
parent = obj->getParent();
parentId = (xdr->script->objectsOffset == 0)
? NO_PARENT_INDEX
: FindObjectIndex(xdr->script->objects(), parent);
depth = (uint16)OBJ_BLOCK_DEPTH(cx, obj);
count = (uint16)OBJ_BLOCK_COUNT(cx, obj);
tmp = (uint32)(depth << 16) | count;
}
#ifdef __GNUC__ /* suppress bogus gcc warnings */
else count = 0;
#endif
/* First, XDR the parent atomid. */
if (!JS_XDRUint32(xdr, &parentId))
return JS_FALSE;
if (xdr->mode == JSXDR_DECODE) {
obj = js_NewBlockObject(cx);
if (!obj)
return JS_FALSE;
*objp = obj;
/*
* If there's a parent id, then get the parent out of our script's
* object array. We know that we XDR block object in outer-to-inner
* order, which means that getting the parent now will work.
*/
if (parentId == NO_PARENT_INDEX)
parent = NULL;
else
parent = xdr->script->getObject(parentId);
obj->setParent(parent);
}
AutoObjectRooter tvr(cx, obj);
if (!JS_XDRUint32(xdr, &tmp))
return false;
if (xdr->mode == JSXDR_DECODE) {
depth = (uint16)(tmp >> 16);
count = (uint16)tmp;
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. We do not XDR any
* non-native properties, only those that the compiler created.
*/
sprop = NULL;
ok = JS_TRUE;
for (i = 0; i < count; i++) {
if (xdr->mode == JSXDR_ENCODE) {
/* Find a property to XDR. */
do {
/* If sprop is NULL, this is the first property. */
sprop = sprop ? sprop->parent : obj->scope()->lastProperty();
} while (!sprop->hasShortID());
JS_ASSERT(sprop->getter() == block_getProperty);
propid = sprop->id;
JS_ASSERT(JSID_IS_ATOM(propid));
atom = JSID_TO_ATOM(propid);
shortid = sprop->shortid;
JS_ASSERT(shortid >= 0);
}
/* XDR the real id, then the shortid. */
if (!js_XDRAtom(xdr, &atom) ||
!JS_XDRUint16(xdr, (uint16 *)&shortid)) {
return false;
}
if (xdr->mode == JSXDR_DECODE) {
if (!js_DefineBlockVariable(cx, obj, ATOM_TO_JSID(atom), shortid))
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 */
PropertyStub, /* setProperty */
EnumerateStub,
ResolveStub,
ConvertStub
};
JSObject *
js_InitObjectClass(JSContext *cx, JSObject *obj)
{
JSObject *proto = js_InitClass(cx, obj, NULL, &js_ObjectClass, (Native) 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. */
if (!js_DefineFunction(cx, obj, cx->runtime->atomState.evalAtom,
(Native)obj_eval, 1,
JSFUN_FAST_NATIVE | JSFUN_STUB_GSOPS)) {
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->getClass()->flags & JSCLASS_IS_GLOBAL);
JS_ASSERT(obj->isNative());
JS_LOCK_OBJ(cx, obj);
JSScope *scope = js_GetMutableScope(cx, obj);
if (!scope) {
JS_UNLOCK_OBJ(cx, obj);
return false;
}
JSScopeProperty *sprop = scope->lookup(id);
if (!sprop) {
uint32 index = 2 * JSProto_LIMIT + key;
if (!js_SetReservedSlot(cx, obj, index, v)) {
JS_UNLOCK_SCOPE(cx, scope);
return false;
}
uint32 slot = JSSLOT_START(obj->getClass()) + index;
sprop = scope->addProperty(cx, id, PropertyStub, PropertyStub,
slot, attrs, 0, 0);
JS_UNLOCK_SCOPE(cx, scope);
if (!sprop)
return false;
named = true;
return true;
}
JS_UNLOCK_SCOPE(cx, scope);
}
named = obj->defineProperty(cx, id, v, PropertyStub, PropertyStub, attrs);
return named;
}
JSObject *
js_InitClass(JSContext *cx, JSObject *obj, JSObject *parent_proto,
Class *clasp, Native constructor, uintN nargs,
JSPropertySpec *ps, JSFunctionSpec *fs,
JSPropertySpec *static_ps, JSFunctionSpec *static_fs)
{
JSAtom *atom;
JSProtoKey key;
JSFunction *fun;
bool named = false;
atom = js_Atomize(cx, clasp->name, strlen(clasp->name), 0);
if (!atom)
return NULL;
/*
* When initializing a standard class, if no parent_proto (grand-proto of
* instances of the class, parent-proto of the class's prototype object)
* is given, we must use Object.prototype if it is available. Otherwise,
* we could look up the wrong binding for a class name in obj. Example:
*
* String = Array;
* print("hi there".join);
*
* should print undefined, not Array.prototype.join. This is required by
* ECMA-262, alas. It might have been better to make String readonly and
* permanent in the global object, instead -- but that's too big a change
* to swallow at this point.
*/
key = JSCLASS_CACHED_PROTO_KEY(clasp);
if (key != JSProto_Null &&
!parent_proto &&
!js_GetClassPrototype(cx, obj, JSProto_Object, &parent_proto)) {
return NULL;
}
/*
* 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, parent_proto, obj);
if (!proto)
return NULL;
/* After this point, control must exit via label bad or out. */
AutoObjectRooter tvr(cx, proto);
JSObject *ctor;
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->getClass()->flags & JSCLASS_IS_GLOBAL) ||
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 {
uint16 flags = 0;
if (clasp->flags & JSCLASS_FAST_CONSTRUCTOR)
flags |= JSFUN_FAST_NATIVE | JSFUN_FAST_NATIVE_CTOR;
fun = js_NewFunction(cx, NULL, constructor, nargs, flags, 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 (!InternalConstruct(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;
}
/*
* Make sure proto's scope's emptyScope is available to be shared by
* objects of this class. JSScope::emptyScope 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::initSharingEmptyScope depend on this.
*/
JSScope *scope;
bool ok;
JS_LOCK_OBJ(cx, proto);
scope = js_GetMutableScope(cx, proto);
ok = scope && scope->ensureEmptyScope(cx, clasp);
JS_UNLOCK_OBJ(cx, proto);
if (!ok)
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);
}
return NULL;
}
bool
JSObject::allocSlots(JSContext *cx, size_t nslots)
{
JS_ASSERT(!dslots);
JS_ASSERT(nslots > JS_INITIAL_NSLOTS);
size_t nwords = slotsToDynamicWords(nslots);
dslots = (Value*) cx->malloc(nwords * sizeof(Value));
if (!dslots)
return false;
dslots++;
dslots[-1].setPrivateUint32(nslots);
SetValueRangeToUndefined(dslots, nslots - JS_INITIAL_NSLOTS);
return true;
}
bool
JSObject::growSlots(JSContext *cx, size_t nslots)
{
/*
* Minimal number of dynamic slots to allocate.
*/
const size_t MIN_DYNAMIC_WORDS = 4;
/*
* The limit to switch to linear allocation strategy from the power of 2
* growth no to waste too much memory.
*/
const size_t LINEAR_GROWTH_STEP = JS_BIT(16);
/* If we are allocating fslots, there is nothing to do. */
if (nslots <= JS_INITIAL_NSLOTS)
return JS_TRUE;
size_t nwords = slotsToDynamicWords(nslots);
/*
* Round up nslots so the number of bytes in dslots array is power
* of 2 to ensure exponential grouth.
*/
uintN log;
if (nwords <= MIN_DYNAMIC_WORDS) {
nwords = MIN_DYNAMIC_WORDS;
} else if (nwords < LINEAR_GROWTH_STEP) {
JS_CEILING_LOG2(log, nwords);
nwords = JS_BIT(log);
} else {
nwords = JS_ROUNDUP(nwords, LINEAR_GROWTH_STEP);
}
nslots = dynamicWordsToSlots(nwords);
/*
* If nothing was allocated yet, treat it as initial allocation (but with
* the exponential growth algorithm applied).
*/
if (!dslots)
return allocSlots(cx, nslots);
size_t oldnslots = dslots[-1].toPrivateUint32();
Value *tmpdslots = (Value*) cx->realloc(dslots - 1, nwords * sizeof(Value));
if (!tmpdslots)
return false; /* Leave dslots at its old size. */
dslots = tmpdslots;
dslots++;
dslots[-1].setPrivateUint32(nslots);
/* Initialize the additional slots we added. */
JS_ASSERT(nslots > oldnslots);
Value *beg = dslots + (oldnslots - JS_INITIAL_NSLOTS);
Value *end = dslots + (nslots - JS_INITIAL_NSLOTS);
SetValueRangeToUndefined(beg, end);
return true;
}
void
JSObject::shrinkSlots(JSContext *cx, size_t nslots)
{
/* Nothing to shrink? */
if (!dslots)
return;
JS_ASSERT(dslots[-1].toPrivateUint32() > JS_INITIAL_NSLOTS);
JS_ASSERT(nslots <= dslots[-1].toPrivateUint32());
if (nslots <= JS_INITIAL_NSLOTS) {
freeSlotsArray(cx);
dslots = NULL;
} else {
size_t nwords = slotsToDynamicWords(nslots);
Value *tmpdslots = (Value*) cx->realloc(dslots - 1, nwords * sizeof(Value));
if (!tmpdslots)
return; /* Leave dslots at its old size. */
dslots = tmpdslots;
dslots++;
dslots[-1].setPrivateUint32(nslots);
}
}
bool
js_EnsureReservedSlots(JSContext *cx, JSObject *obj, size_t nreserved)
{
uintN nslots = JSSLOT_FREE(obj->getClass()) + nreserved;
if (nslots > obj->numSlots() && !obj->allocSlots(cx, nslots))
return false;
if (obj->isNative()) {
JSScope *scope = obj->scope();
if (!scope->isSharedEmpty()) {
#ifdef JS_THREADSAFE
JS_ASSERT(scope->title.ownercx->thread == cx->thread);
#endif
JS_ASSERT(scope->freeslot == JSSLOT_FREE(obj->getClass()));
if (scope->freeslot < nslots)
scope->freeslot = nslots;
}
}
return true;
}
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);
if (obj->isNative()) {
JS_LOCK_OBJ(cx, obj);
bool ok = !!js_GetMutableScope(cx, obj);
JS_UNLOCK_OBJ(cx, obj);
if (!ok)
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()) {
JS_LOCK_OBJ(cx, oldproto);
JSScope *scope = oldproto->scope();
scope->protoShapeChange(cx);
JSObject *tmp = oldproto->getProto();
JS_UNLOCK_OBJ(cx, oldproto);
oldproto = tmp;
}
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)
{
JSObject *tmp, *cobj;
JSResolvingKey rkey;
JSResolvingEntry *rentry;
uint32 generation;
JSObjectOp init;
Value v;
while ((tmp = obj->getParent()) != NULL)
obj = tmp;
if (!(obj->getClass()->flags & JSCLASS_IS_GLOBAL)) {
*objp = NULL;
return JS_TRUE;
}
v = obj->getReservedSlot(key);
if (v.isObject()) {
*objp = &v.toObject();
return JS_TRUE;
}
rkey.obj = obj;
rkey.id = ATOM_TO_JSID(cx->runtime->atomState.classAtoms[key]);
if (!js_StartResolving(cx, &rkey, JSRESFLAG_LOOKUP, &rentry))
return JS_FALSE;
if (!rentry) {
/* Already caching key in obj -- suppress recursion. */
*objp = NULL;
return JS_TRUE;
}
generation = cx->resolvingTable->generation;
JSBool ok = true;
cobj = NULL;
init = lazy_prototype_init[key];
if (init) {
if (!init(cx, obj)) {
ok = JS_FALSE;
} else {
v = obj->getReservedSlot(key);
if (v.isObject())
cobj = &v.toObject();
}
}
js_StopResolving(cx, &rkey, JSRESFLAG_LOOKUP, rentry, generation);
*objp = cobj;
return ok;
}
JSBool
js_SetClassObject(JSContext *cx, JSObject *obj, JSProtoKey key, JSObject *cobj, JSObject *proto)
{
JS_ASSERT(!obj->getParent());
if (!(obj->getClass()->flags & JSCLASS_IS_GLOBAL))
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;
JSScopeProperty *sprop;
/*
* 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->fp) != NULL)
start = fp->maybeScopeChain();
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()) {
sprop = (JSScopeProperty *) prop;
if (SPROP_HAS_VALID_SLOT(sprop, pobj->scope())) {
v = pobj->lockedGetSlot(sprop->slot);
if (v.isPrimitive())
v.setUndefined();
}
JS_UNLOCK_OBJ(cx, pobj);
}
*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;
Value rval;
if (!InternalConstruct(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;
}
/*
* FIXME bug 535629: If one adds props, deletes earlier props, adds more, the
* last added won't recycle the deleted props' slots.
*/
JSBool
js_AllocSlot(JSContext *cx, JSObject *obj, uint32 *slotp)
{
JSScope *scope = obj->scope();
JS_ASSERT(scope->object == obj);
if (scope->freeslot >= obj->numSlots() &&
!obj->growSlots(cx, scope->freeslot + 1)) {
return JS_FALSE;
}
/* js_ReallocSlots or js_FreeSlot should set the free slots to void. */
JS_ASSERT(obj->getSlot(scope->freeslot).isUndefined());
*slotp = scope->freeslot++;
return JS_TRUE;
}
void
js_FreeSlot(JSContext *cx, JSObject *obj, uint32 slot)
{
JSScope *scope = obj->scope();
JS_ASSERT(scope->object == obj);
obj->lockedSetSlot(slot, UndefinedValue());
if (scope->freeslot == slot + 1)
scope->freeslot = slot;
}
/* 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);
JSString *str = ATOM_TO_STRING(atom);
const jschar *s = str->flatChars();
jschar ch = *s;
JSBool negative = (ch == '-');
if (negative)
ch = *++s;
if (!JS7_ISDEC(ch))
return id;
size_t n = str->flatLength() - 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 (oldIndex < JSID_INT_MAX / 10 ||
(oldIndex == JSID_INT_MAX / 10 && c <= (JSID_INT_MAX % 10))) {
if (negative)
index = 0 - index;
id = INT_TO_JSID((jsint)index);
}
return id;
}
static JSBool
PurgeProtoChain(JSContext *cx, JSObject *obj, jsid id)
{
JSScope *scope;
JSScopeProperty *sprop;
while (obj) {
if (!obj->isNative()) {
obj = obj->getProto();
continue;
}
JS_LOCK_OBJ(cx, obj);
scope = obj->scope();
sprop = scope->lookup(id);
if (sprop) {
PCMETER(JS_PROPERTY_CACHE(cx).pcpurges++);
scope->shadowingShapeChange(cx, sprop);
JS_UNLOCK_SCOPE(cx, scope);
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();
JS_UNLOCK_SCOPE(cx, scope);
}
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->getClass() == &js_CallClass) {
while ((obj = obj->getParent()) != NULL) {
if (PurgeProtoChain(cx, obj, id))
break;
}
}
}
JSScopeProperty *
js_AddNativeProperty(JSContext *cx, JSObject *obj, jsid id,
PropertyOp getter, PropertyOp setter, uint32 slot,
uintN attrs, uintN flags, intN shortid)
{
JSScope *scope;
JSScopeProperty *sprop;
JS_ASSERT(!(flags & JSScopeProperty::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);
JS_LOCK_OBJ(cx, obj);
scope = js_GetMutableScope(cx, obj);
if (!scope) {
sprop = NULL;
} else {
/* Convert string indices to integers if appropriate. */
id = js_CheckForStringIndex(id);
sprop = scope->putProperty(cx, id, getter, setter, slot, attrs, flags, shortid);
}
JS_UNLOCK_OBJ(cx, obj);
return sprop;
}
JSScopeProperty *
js_ChangeNativePropertyAttrs(JSContext *cx, JSObject *obj,
JSScopeProperty *sprop, uintN attrs, uintN mask,
PropertyOp getter, PropertyOp setter)
{
JSScope *scope;
JS_LOCK_OBJ(cx, obj);
scope = js_GetMutableScope(cx, obj);
if (!scope) {
sprop = NULL;
} else {
sprop = scope->changeProperty(cx, sprop, attrs, mask, getter, setter);
}
JS_UNLOCK_OBJ(cx, obj);
return sprop;
}
JSBool
js_DefineProperty(JSContext *cx, JSObject *obj, jsid id, const Value *value,
PropertyOp getter, PropertyOp 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 slot-full property, while GC safety wants that
* value to be stored before the call-out through the hook. Optimize to do
* both while saving cycles for classes that stub their addProperty hook.
*/
static inline bool
AddPropertyHelper(JSContext *cx, Class *clasp, JSObject *obj, JSScope *scope,
JSScopeProperty *sprop, Value *vp)
{
if (clasp->addProperty != PropertyStub) {
Value nominal = *vp;
if (!callJSPropertyOp(cx, clasp->addProperty, obj, SPROP_USERID(sprop), vp))
return false;
if (*vp != nominal) {
if (SPROP_HAS_VALID_SLOT(sprop, scope))
obj->lockedSetSlot(sprop->slot, *vp);
}
}
return true;
}
JSBool
js_DefineNativeProperty(JSContext *cx, JSObject *obj, jsid id, const Value &value,
PropertyOp getter, PropertyOp setter, uintN attrs,
uintN flags, intN shortid, JSProperty **propp,
uintN defineHow /* = 0 */)
{
Class *clasp;
JSScope *scope;
JSScopeProperty *sprop;
JSBool added;
Value valueCopy;
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.
*/
sprop = NULL;
if (attrs & (JSPROP_GETTER | JSPROP_SETTER)) {
JSObject *pobj;
JSProperty *prop;
/*
* If JS_THREADSAFE and id is found, js_LookupProperty returns with
* sprop non-null and pobj locked. If pobj == obj, the property is
* already in obj and obj has its own (mutable) scope. So if we are
* defining a getter whose setter was already defined, or vice versa,
* finish the job via js_ChangeScopePropertyAttributes, and refresh
* the property cache line for (obj, id) to map sprop.
*/
if (!js_LookupProperty(cx, obj, id, &pobj, &prop))
return JS_FALSE;
sprop = (JSScopeProperty *) prop;
if (sprop && pobj == obj && sprop->isAccessorDescriptor()) {
sprop = obj->scope()->changeProperty(cx, sprop, attrs,
JSPROP_GETTER | JSPROP_SETTER,
(attrs & JSPROP_GETTER)
? getter
: sprop->getter(),
(attrs & JSPROP_SETTER)
? setter
: sprop->setter());
/* NB: obj == pobj, so we can share unlock code at the bottom. */
if (!sprop)
goto error;
} else if (prop) {
pobj->dropProperty(cx, prop);
prop = NULL;
sprop = 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, false);
/* Lock if object locking is required by this implementation. */
JS_LOCK_OBJ(cx, obj);
/* Use the object's class getter and setter by default. */
clasp = 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. */
scope = js_GetMutableScope(cx, obj);
if (!scope)
goto error;
added = false;
if (!sprop) {
/* 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 |= JSScopeProperty::METHOD;
getter = CastAsPropertyOp(funobj);
}
}
added = !scope->hasProperty(id);
uint32 oldShape = scope->shape;
sprop = scope->putProperty(cx, id, getter, setter, SPROP_INVALID_SLOT,
attrs, flags, shortid);
if (!sprop)
goto error;
/*
* If sprop is a method, the above call to putProperty suffices to
* update the shape if necessary. But if scope->branded(), the shape
* may not have changed and we may be overwriting a function-valued
* property. See bug 560998.
*/
if (scope->shape == oldShape && scope->branded() && sprop->slot != SPROP_INVALID_SLOT)
scope->methodWriteBarrier(cx, sprop->slot, value);
}
/* Store value before calling addProperty, in case the latter GC's. */
if (SPROP_HAS_VALID_SLOT(sprop, scope))
obj->lockedSetSlot(sprop->slot, value);
/* XXXbe called with lock held */
valueCopy = value;
if (!AddPropertyHelper(cx, clasp, obj, scope, sprop, &valueCopy)) {
scope->removeProperty(cx, id);
goto error;
}
if (defineHow & JSDNP_CACHE_RESULT) {
#ifdef JS_TRACER
JS_ASSERT_NOT_ON_TRACE(cx);
PropertyCacheEntry *entry =
#endif
JS_PROPERTY_CACHE(cx).fill(cx, obj, 0, 0, obj, sprop, added);
TRACE_2(SetPropHit, entry, sprop);
}
if (propp)
*propp = (JSProperty *) sprop;
else
JS_UNLOCK_OBJ(cx, obj);
return JS_TRUE;
error: // TRACE_2 jumps here on error, as well.
JS_UNLOCK_OBJ(cx, obj);
return JS_FALSE;
}
JS_FRIEND_API(JSBool)
js_LookupProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
JSProperty **propp)
{
return js_LookupPropertyWithFlags(cx, obj, id, cx->resolveFlags,
objp, propp) >= 0;
}
#define SCOPE_DEPTH_ACCUM(bs,val) \
JS_SCOPE_DEPTH_METERING(JS_BASIC_STATS_ACCUM(bs, val))
/*
* Call obj's resolve hook. obj is a native object and the caller holds its
* scope lock.
*
* 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, unlock obj, and return false.
*
* - If we are alrady resolving a property of *curobjp, set *recursedp = true,
* unlock obj, and return true.
*
* - If the resolve hook finds or defines the sought property, set *objp and
* *propp appropriately, set *recursedp = false, and return true with *objp's
* lock held.
*
* - 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;
JSScope *scope = obj->scope();
/*
* 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.
*/
JSResolvingKey key = {obj, id};
JSResolvingEntry *entry;
if (!js_StartResolving(cx, &key, JSRESFLAG_LOOKUP, &entry)) {
JS_UNLOCK_OBJ(cx, obj);
return false;
}
if (!entry) {
/* Already resolving id in obj -- suppress recursion. */
JS_UNLOCK_OBJ(cx, obj);
*recursedp = true;
return true;
}
uint32 generation = cx->resolvingTable->generation;
*recursedp = false;
*propp = NULL;
JSBool ok;
JSScopeProperty *sprop = NULL;
if (clasp->flags & JSCLASS_NEW_RESOLVE) {
JSNewResolveOp newresolve = (JSNewResolveOp)resolve;
if (flags == JSRESOLVE_INFER)
flags = js_InferFlags(cx, flags);
JSObject *obj2 = (clasp->flags & JSCLASS_NEW_RESOLVE_GETS_START) ? start : NULL;
JS_UNLOCK_OBJ(cx, obj);
{
/* Protect id and all atoms from a GC nested in resolve. */
AutoKeepAtoms keep(cx->runtime);
ok = newresolve(cx, obj, id, flags, &obj2);
}
if (!ok)
goto cleanup;
JS_LOCK_OBJ(cx, obj);
if (obj2) {
/* Resolved: juggle locks and lookup id again. */
if (obj2 != obj) {
JS_UNLOCK_OBJ(cx, obj);
if (obj2->isNative())
JS_LOCK_OBJ(cx, obj2);
}
if (!obj2->isNative()) {
/* Whoops, newresolve handed back a foreign obj2. */
JS_ASSERT(obj2 != obj);
ok = obj2->lookupProperty(cx, id, objp, propp);
if (!ok || *propp)
goto cleanup;
JS_LOCK_OBJ(cx, obj2);
} else {
/*
* Require that obj2 have its own scope now, as we
* do for old-style resolve. If it doesn't, then
* id was not truly resolved, and we'll find it in
* the proto chain, or miss it if obj2's proto is
* not on obj's proto chain. That last case is a
* "too bad!" case.
*/
scope = obj2->scope();
if (!scope->isSharedEmpty())
sprop = scope->lookup(id);
}
if (sprop) {
JS_ASSERT(scope == obj2->scope());
JS_ASSERT(!scope->isSharedEmpty());
obj = obj2;
} else if (obj2 != obj) {
if (obj2->isNative())
JS_UNLOCK_OBJ(cx, obj2);
JS_LOCK_OBJ(cx, obj);
}
}
} else {
/*
* Old resolve always requires id re-lookup if obj owns
* its scope after resolve returns.
*/
JS_UNLOCK_OBJ(cx, obj);
ok = resolve(cx, obj, id);
if (!ok)
goto cleanup;
JS_LOCK_OBJ(cx, obj);
JS_ASSERT(obj->isNative());
scope = obj->scope();
if (!scope->isSharedEmpty())
sprop = scope->lookup(id);
}
cleanup:
if (ok && sprop) {
JS_ASSERT(obj->scope() == scope);
*objp = obj;
*propp = (JSProperty *) sprop;
}
js_StopResolving(cx, &key, JSRESFLAG_LOOKUP, entry, generation);
return ok;
}
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);
/* Search scopes starting with obj and following the prototype link. */
JSObject *start = obj;
int protoIndex;
for (protoIndex = 0; ; protoIndex++) {
JS_LOCK_OBJ(cx, obj);
JSScopeProperty *sprop = obj->scope()->lookup(id);
if (sprop) {
SCOPE_DEPTH_ACCUM(&cx->runtime->protoLookupDepthStats, protoIndex);
*objp = obj;
*propp = (JSProperty *) sprop;
return protoIndex;
}
/* Try obj's class resolve hook if id was not found in obj's scope. */
if (!sprop && 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();
JS_UNLOCK_OBJ(cx, obj);
if (!proto)
break;
if (!proto->isNative()) {
if (!proto->lookupProperty(cx, id, objp, propp))
return -1;
return protoIndex + 1;
}
obj = proto;
}
*objp = NULL;
*propp = NULL;
return protoIndex;
}
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)->getScopeChain();
/* 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
? js_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
* the compile-time prototype provides all its properties.
*/
JS_ASSERT(pobj == obj->getProto());
JS_ASSERT(protoIndex == 1);
} 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,
(JSScopeProperty *) 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;
}
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 js_IsCacheableNonGlobalScope
* must not be passed a global object (i.e. one with null parent).
*/
for (int scopeIndex = 0;
!obj->getParent() || js_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,
(JSScopeProperty *) prop);
JS_ASSERT(entry);
JS_UNLOCK_OBJ(cx, pobj);
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) {
pobj->dropProperty(cx, 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;
}
JSBool
js_NativeGet(JSContext *cx, JSObject *obj, JSObject *pobj,
JSScopeProperty *sprop, uintN getHow, Value *vp)
{
LeaveTraceIfGlobalObject(cx, pobj);
JSScope *scope;
uint32 slot;
int32 sample;
JS_ASSERT(pobj->isNative());
JS_ASSERT(JS_IS_OBJ_LOCKED(cx, pobj));
scope = pobj->scope();
slot = sprop->slot;
if (slot != SPROP_INVALID_SLOT)
*vp = pobj->lockedGetSlot(slot);
else
vp->setUndefined();
if (sprop->hasDefaultGetter())
return true;
if (JS_UNLIKELY(sprop->isMethod()) && (getHow & JSGET_NO_METHOD_BARRIER)) {
JS_ASSERT(&sprop->methodObject() == &vp->toObject());
return true;
}
sample = cx->runtime->propertyRemovals;
JS_UNLOCK_SCOPE(cx, scope);
{
AutoScopePropertyRooter tvr(cx, sprop);
AutoObjectRooter tvr2(cx, pobj);
if (!sprop->get(cx, obj, pobj, vp))
return false;
}
JS_LOCK_SCOPE(cx, scope);
if (SLOT_IN_SCOPE(slot, scope) &&
(JS_LIKELY(cx->runtime->propertyRemovals == sample) ||
scope->hasProperty(sprop))) {
if (!scope->methodWriteBarrier(cx, sprop, *vp)) {
JS_UNLOCK_SCOPE(cx, scope);
return false;
}
pobj->lockedSetSlot(slot, *vp);
}
return true;
}
JSBool
js_NativeSet(JSContext *cx, JSObject *obj, JSScopeProperty *sprop, bool added,
Value *vp)
{
LeaveTraceIfGlobalObject(cx, obj);
JSScope *scope;
uint32 slot;
int32 sample;
JS_ASSERT(obj->isNative());
JS_ASSERT(JS_IS_OBJ_LOCKED(cx, obj));
scope = obj->scope();
slot = sprop->slot;
if (slot != SPROP_INVALID_SLOT) {
OBJ_CHECK_SLOT(obj, slot);
/* If sprop has a stub setter, keep scope locked and just store *vp. */
if (sprop->hasDefaultSetter()) {
if (!added && !scope->methodWriteBarrier(cx, sprop, *vp)) {
JS_UNLOCK_SCOPE(cx, scope);
return false;
}
obj->lockedSetSlot(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 (!sprop->hasGetterValue() && sprop->hasDefaultSetter())
return js_ReportGetterOnlyAssignment(cx);
}
sample = cx->runtime->propertyRemovals;
JS_UNLOCK_SCOPE(cx, scope);
{
AutoScopePropertyRooter tvr(cx, sprop);
if (!sprop->set(cx, obj, vp))
return false;
}
JS_LOCK_SCOPE(cx, scope);
if (SLOT_IN_SCOPE(slot, scope) &&
(JS_LIKELY(cx->runtime->propertyRemovals == sample) ||
scope->hasProperty(sprop))) {
if (!added && !scope->methodWriteBarrier(cx, sprop, *vp)) {
JS_UNLOCK_SCOPE(cx, scope);
return false;
}
obj->lockedSetSlot(slot, *vp);
}
return true;
}
JSBool
js_GetPropertyHelper(JSContext *cx, JSObject *obj, jsid id, uintN getHow,
Value *vp)
{
JSObject *aobj, *obj2;
int protoIndex;
JSProperty *prop;
JSScopeProperty *sprop;
JS_ASSERT_IF(getHow & JSGET_CACHE_RESULT, !JS_ON_TRACE(cx));
/* Convert string indices to integers if appropriate. */
id = js_CheckForStringIndex(id);
aobj = js_GetProtoIfDenseArray(obj);
protoIndex = js_LookupPropertyWithFlags(cx, aobj, id, cx->resolveFlags,
&obj2, &prop);
if (protoIndex < 0)
return JS_FALSE;
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->getScript(), pc);
}
if (op == JSOP_GETXPROP) {
flags = JSREPORT_ERROR;
} else {
if (!JS_HAS_STRICT_OPTION(cx) ||
(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->getProperty(cx, id, vp);
sprop = (JSScopeProperty *) prop;
if (getHow & JSGET_CACHE_RESULT) {
JS_ASSERT_NOT_ON_TRACE(cx);
JS_PROPERTY_CACHE(cx).fill(cx, aobj, 0, protoIndex, obj2, sprop);
}
if (!js_NativeGet(cx, obj, obj2, sprop, getHow, vp))
return JS_FALSE;
JS_UNLOCK_OBJ(cx, obj2);
return JS_TRUE;
}
JSBool
js_GetProperty(JSContext *cx, JSObject *obj, jsid id, Value *vp)
{
return js_GetPropertyHelper(cx, obj, id, JSGET_METHOD_BARRIER, 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, 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->hasScript() && fp->getScript()->strictModeCode) &&
!JS_HAS_STRICT_OPTION(cx)) {
return true;
}
const char *bytes = js_GetStringBytes(cx, propname);
return bytes &&
JS_ReportErrorFlagsAndNumber(cx,
(JSREPORT_WARNING | JSREPORT_STRICT
| JSREPORT_STRICT_MODE_ERROR),
js_GetErrorMessage, NULL,
JSMSG_UNDECLARED_VAR, bytes);
}
namespace js {
JSBool
ReportReadOnly(JSContext* cx, jsid id, uintN flags)
{
return js_ReportValueErrorFlags(cx, flags, JSMSG_READ_ONLY,
JSDVG_IGNORE_STACK, IdToValue(id), NULL,
NULL, NULL);
}
}
/*
* Note: all non-error exits in this function must notify the tracer using
* SetPropHit when called from the interpreter, which is detected by testing
* (defineHow & JSDNP_CACHE_RESULT).
*/
JSBool
js_SetPropertyHelper(JSContext *cx, JSObject *obj, jsid id, uintN defineHow,
Value *vp)
{
int protoIndex;
JSObject *pobj;
JSProperty *prop;
JSScopeProperty *sprop;
JSScope *scope;
uintN attrs, flags;
intN shortid;
Class *clasp;
PropertyOp getter, 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);
/*
* We peek at obj->scope() without locking obj. Any race means a failure
* to seal before sharing, which is inherently ambiguous.
*/
if (obj->scope()->sealed() && obj->scope()->object == obj)
return ReportReadOnly(cx, id, JSREPORT_ERROR);
protoIndex = js_LookupPropertyWithFlags(cx, obj, id, cx->resolveFlags,
&pobj, &prop);
if (protoIndex < 0)
return JS_FALSE;
if (prop) {
if (!pobj->isNative())
prop = NULL;
} else {
/* We should never add properties to lexical blocks. */
JS_ASSERT(obj->getClass() != &js_BlockClass);
if (!obj->getParent() &&
(defineHow & JSDNP_UNQUALIFIED) &&
!js_CheckUndeclaredVarAssignment(cx, JSID_TO_STRING(id))) {
return JS_FALSE;
}
}
sprop = (JSScopeProperty *) prop;
/*
* Now either sprop is null, meaning id was not found in obj or one of its
* prototypes; or sprop is non-null, meaning id was found in pobj's scope.
* If JS_THREADSAFE and sprop is non-null, then scope is locked, and sprop
* is held: we must JSObject::dropProperty or JS_UNLOCK_SCOPE before we
* return (the two are equivalent for native objects, but we use
* JS_UNLOCK_SCOPE because it is cheaper).
*/
attrs = JSPROP_ENUMERATE;
flags = 0;
shortid = 0;
clasp = obj->getClass();
getter = clasp->getProperty;
setter = clasp->setProperty;
if (sprop) {
/*
* Set scope for use below. It was locked by js_LookupProperty, and
* we know pobj owns it (i.e., scope->object == pobj). Therefore we
* optimize JS_UNLOCK_OBJ(cx, pobj) into JS_UNLOCK_SCOPE(cx, scope).
*/
scope = pobj->scope();
/* ES5 8.12.4 [[Put]] step 2. */
if (sprop->isAccessorDescriptor()) {
if (sprop->hasDefaultSetter()) {
JS_UNLOCK_SCOPE(cx, scope);
if (defineHow & JSDNP_CACHE_RESULT)
TRACE_2(SetPropHit, JS_NO_PROP_CACHE_FILL, sprop);
return js_ReportGetterOnlyAssignment(cx);
}
} else {
JS_ASSERT(sprop->isDataDescriptor());
if (!sprop->writable()) {
JS_UNLOCK_SCOPE(cx, scope);
PCMETER((defineHow & JSDNP_CACHE_RESULT) && JS_PROPERTY_CACHE(cx).rofills++);
if (defineHow & JSDNP_CACHE_RESULT) {
JS_ASSERT_NOT_ON_TRACE(cx);
TRACE_2(SetPropHit, JS_NO_PROP_CACHE_FILL, sprop);
}
/* Warn in strict mode, otherwise do nothing. */
if (JS_HAS_STRICT_OPTION(cx))
return ReportReadOnly(cx, id, JSREPORT_STRICT | JSREPORT_WARNING);
return JS_TRUE;
#ifdef JS_TRACER
error: // TRACE_2 jumps here in case of error.
return JS_FALSE;
#endif
}
}
if (scope->sealed() && !sprop->hasSlot()) {
JS_UNLOCK_SCOPE(cx, scope);
return ReportReadOnly(cx, id, JSREPORT_ERROR);
}
attrs = sprop->attributes();
if (pobj != obj) {
/*
* We found id in a prototype object: prepare to share or shadow.
*
* NB: Thanks to the immutable, garbage-collected property tree
* maintained by jsscope.c in cx->runtime, we needn't worry about
* sprop going away behind our back after we've unlocked scope.
*/
JS_UNLOCK_SCOPE(cx, scope);
/* Don't clone a prototype property that doesn't have a slot. */
if (!sprop->hasSlot()) {
if (defineHow & JSDNP_CACHE_RESULT) {
#ifdef JS_TRACER
JS_ASSERT_NOT_ON_TRACE(cx);
PropertyCacheEntry *entry =
#endif
JS_PROPERTY_CACHE(cx).fill(cx, obj, 0, protoIndex, pobj, sprop);
TRACE_2(SetPropHit, entry, sprop);
}
if (sprop->hasDefaultSetter() && !sprop->hasGetterValue())
return JS_TRUE;
return sprop->set(cx, obj, vp);
}
/* Restore attrs to the ECMA default for new properties. */
attrs = JSPROP_ENUMERATE;
/*
* Preserve the shortid, getter, and setter when shadowing any
* property that has a shortid. An old API convention requires
* that the property's getter and setter functions receive the
* shortid, not id, when they are called on the shadow we are
* about to create in obj's scope.
*/
if (sprop->hasShortID()) {
flags = JSScopeProperty::HAS_SHORTID;
shortid = sprop->shortid;
getter = sprop->getter();
setter = sprop->setter();
}
/*
* Forget we found the proto-property now that we've copied any
* needed member values.
*/
sprop = NULL;
}
#ifdef __GNUC__ /* suppress bogus gcc warnings */
} else {
scope = NULL;
#endif
}
added = false;
if (!sprop) {
/*
* 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. */
JS_LOCK_OBJ(cx, obj);
scope = js_GetMutableScope(cx, obj);
if (!scope) {
JS_UNLOCK_OBJ(cx, obj);
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 |= JSScopeProperty::METHOD;
getter = CastAsPropertyOp(funobj);
}
}
sprop = scope->putProperty(cx, id, getter, setter, SPROP_INVALID_SLOT,
attrs, flags, shortid);
if (!sprop) {
JS_UNLOCK_SCOPE(cx, scope);
return JS_FALSE;
}
/*
* Initialize the new property value (passed to setter) to undefined.
* Note that we store before calling addProperty, to match the order
* in js_DefineNativeProperty.
*/
if (SPROP_HAS_VALID_SLOT(sprop, scope))
obj->lockedSetSlot(sprop->slot, UndefinedValue());
/* XXXbe called with obj locked */
if (!AddPropertyHelper(cx, clasp, obj, scope, sprop, vp)) {
scope->removeProperty(cx, id);
JS_UNLOCK_SCOPE(cx, scope);
return JS_FALSE;
}
added = true;
}
if (defineHow & JSDNP_CACHE_RESULT) {
#ifdef JS_TRACER
JS_ASSERT_NOT_ON_TRACE(cx);
PropertyCacheEntry *entry =
#endif
JS_PROPERTY_CACHE(cx).fill(cx, obj, 0, 0, obj, sprop, added);
TRACE_2(SetPropHit, entry, sprop);
}
if (!js_NativeSet(cx, obj, sprop, added, vp))
return NULL;
JS_UNLOCK_SCOPE(cx, scope);
return JS_TRUE;
}
JSBool
js_SetProperty(JSContext *cx, JSObject *obj, jsid id, Value *vp)
{
return js_SetPropertyHelper(cx, obj, id, 0, vp);
}
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);
JSScopeProperty *sprop = (JSScopeProperty *)prop;
*attrsp = sprop->attributes();
JS_UNLOCK_OBJ(cx, obj);
return true;
}
JSBool
js_SetNativeAttributes(JSContext *cx, JSObject *obj, JSScopeProperty *sprop,
uintN attrs)
{
JS_ASSERT(obj->isNative());
sprop = js_ChangeNativePropertyAttrs(cx, obj, sprop, attrs, 0,
sprop->getter(), sprop->setter());
JS_UNLOCK_OBJ(cx, obj);
return (sprop != NULL);
}
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, (JSScopeProperty *) prop, *attrsp)
: obj->setAttributes(cx, id, attrsp);
}
JSBool
js_DeleteProperty(JSContext *cx, JSObject *obj, jsid id, Value *rval)
{
JSObject *proto;
JSProperty *prop;
JSScopeProperty *sprop;
JSScope *scope;
JSBool ok;
rval->setBoolean(true);
/* Convert string indices to integers if appropriate. */
id = js_CheckForStringIndex(id);
if (!js_LookupProperty(cx, obj, id, &proto, &prop))
return JS_FALSE;
if (!prop || proto != obj) {
/*
* If the property was found in a native prototype, check whether it's
* shared and permanent. Such a property stands for direct properties
* in all delegating objects, matching ECMA semantics without bloating
* each delegating object.
*/
if (prop) {
if (proto->isNative()) {
sprop = (JSScopeProperty *)prop;
if (sprop->isSharedPermanent())
rval->setBoolean(false);
JS_UNLOCK_OBJ(cx, proto);
}
if (rval->isBoolean() && rval->toBoolean() == false)
return JS_TRUE;
}
/*
* If no property, or the property comes unshared or impermanent from
* a prototype, call the class's delProperty hook, passing rval as the
* result parameter.
*/
return callJSPropertyOp(cx, obj->getClass()->delProperty, obj, id, rval);
}
sprop = (JSScopeProperty *)prop;
if (!sprop->configurable()) {
JS_UNLOCK_OBJ(cx, obj);
rval->setBoolean(false);
return JS_TRUE;
}
/* XXXbe called with obj locked */
if (!callJSPropertyOp(cx, obj->getClass()->delProperty, obj, SPROP_USERID(sprop), rval)) {
JS_UNLOCK_OBJ(cx, obj);
return JS_FALSE;
}
scope = obj->scope();
if (SPROP_HAS_VALID_SLOT(sprop, scope)) {
const Value &v = obj->lockedGetSlot(sprop->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 (scope->hasMethodBarrier()) {
JSObject *funobj;
if (IsFunctionObject(v, &funobj)) {
JSFunction *fun = GET_FUNCTION_PRIVATE(cx, funobj);
if (fun != funobj) {
for (JSStackFrame *fp = cx->fp; fp; fp = fp->down) {
if (fp->callee() == fun &&
fp->getThisValue().isObject() &&
&fp->getThisValue().toObject() == obj) {
fp->setCalleeObject(*funobj);
}
}
}
}
}
}
ok = scope->removeProperty(cx, id);
JS_UNLOCK_OBJ(cx, obj);
return ok && js_SuppressDeletedProperty(cx, obj, id);
}
namespace js {
JSBool
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 for String objects with standard toString methods. Support
* new String(...) instances whether mutated to have their own scope or
* not, as well as direct String.prototype references.
*/
if (obj->getClass() == &js_StringClass) {
jsid toStringId = ATOM_TO_JSID(cx->runtime->atomState.toStringAtom);
JS_LOCK_OBJ(cx, obj);
JSScope *scope = obj->scope();
JSScopeProperty *sprop = scope->lookup(toStringId);
JSObject *pobj = obj;
if (!sprop) {
pobj = obj->getProto();
if (pobj && pobj->getClass() == &js_StringClass) {
JS_UNLOCK_SCOPE(cx, scope);
JS_LOCK_OBJ(cx, pobj);
scope = pobj->scope();
sprop = scope->lookup(toStringId);
}
}
if (sprop && sprop->hasDefaultGetter() && SPROP_HAS_VALID_SLOT(sprop, scope)) {
const Value &fval = pobj->lockedGetSlot(sprop->slot);
JSObject *funobj;
if (IsFunctionObject(fval, &funobj)) {
JSFunction *fun = GET_FUNCTION_PRIVATE(cx, funobj);
if (FUN_FAST_NATIVE(fun) == js_str_toString) {
JS_UNLOCK_SCOPE(cx, scope);
*vp = obj->getPrimitiveThis();
return JS_TRUE;
}
}
}
JS_UNLOCK_SCOPE(cx, scope);
}
/*
* Propagate the exception if js_TryMethod finds an appropriate
* method, and calling that method returned failure.
*/
if (!js_TryMethod(cx, obj, cx->runtime->atomState.toStringAtom,
0, NULL, &v)) {
return JS_FALSE;
}
if (!v.isPrimitive()) {
if (!obj->getClass()->convert(cx, obj, hint, &v))
return JS_FALSE;
}
} else {
if (!obj->getClass()->convert(cx, obj, hint, &v))
return JS_FALSE;
if (v.isObject()) {
JS_ASSERT(hint != TypeOfValue(cx, v));
if (!js_TryMethod(cx, obj, cx->runtime->atomState.toStringAtom, 0, NULL, &v))
return JS_FALSE;
}
}
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 JS_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 JS_FALSE;
}
*vp = v;
return JS_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;
JSScopeProperty *sprop;
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;
}
sprop = (JSScopeProperty *)prop;
*attrsp = sprop->attributes();
if (!writing) {
if (SPROP_HAS_VALID_SLOT(sprop, pobj->scope()))
*vp = pobj->lockedGetSlot(sprop->slot);
else
vp->setUndefined();
}
JS_UNLOCK_OBJ(cx, pobj);
}
/*
* 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)
{
/*
* Unfortunately we have wrappers that are native objects and thus don't
* overwrite js_TypeOf (i.e. XPCCrossOriginWrapper), so we have to
* unwrap here.
*/
obj = obj->wrappedObject(cx);
/*
* ECMA 262, 11.4.3 says that any native object that implements
* [[Call]] should be of type "function". However, RegExp is of
* type "object", not "function", for Web compatibility.
*/
if (obj->isCallable()) {
return (obj->getClass() != &js_RegExpClass)
? JSTYPE_FUNCTION
: JSTYPE_OBJECT;
}
return JSTYPE_OBJECT;
}
#ifdef JS_THREADSAFE
void
js_DropProperty(JSContext *cx, JSObject *obj, JSProperty *prop)
{
JS_UNLOCK_OBJ(cx, obj);
}
#endif
bool
js_IsDelegate(JSContext *cx, JSObject *obj, const Value &v)
{
if (v.isPrimitive())
return false;
JSObject *obj2 = v.toObject().wrappedObject(cx);
while ((obj2 = obj2->getProto()) != NULL) {
if (obj2 == obj)
return true;
}
return false;
}
bool
js::FindClassPrototype(JSContext *cx, JSObject *scope, JSProtoKey protoKey, JSObject **protop,
Class *clasp)
{
Value v;
if (!js_FindClassObject(cx, scope, 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 *scope, 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 (!scope) {
if (cx->fp)
scope = cx->fp->maybeScopeChain();
if (!scope) {
scope = cx->globalObject;
if (!scope) {
*protop = NULL;
return true;
}
}
}
scope = scope->getGlobal();
if (scope->getClass()->flags & JSCLASS_IS_GLOBAL) {
const Value &v = scope->getReservedSlot(JSProto_LIMIT + protoKey);
if (v.isObject()) {
*protop = &v.toObject();
return true;
}
}
}
return FindClassPrototype(cx, scope, protoKey, protop, clasp);
}
/*
* For shared precompilation of function objects, we support cloning on entry
* to an execution context in which the function declaration or expression
* should be processed as if it were not precompiled, where the precompiled
* function's scope chain does not match the execution context's. The cloned
* function object carries its execution-context scope in its parent slot; it
* links to the precompiled function (the "clone-parent") via its proto slot.
*
* Note that this prototype-based delegation leaves an unchecked access path
* from the clone to the clone-parent's 'constructor' property. If the clone
* lives in a less privileged or shared scope than the clone-parent, this is
* a security hole, a sharing hazard, or both. Therefore we check all such
* accesses with the following getter/setter pair, which we use when defining
* 'constructor' in f.prototype for all function objects f.
*/
static JSBool
CheckCtorGetAccess(JSContext *cx, JSObject *obj, jsid id, Value *vp)
{
JSAtom *atom = cx->runtime->atomState.constructorAtom;
JS_ASSERT(id == ATOM_TO_JSID(atom));
uintN attrs;
return CheckAccess(cx, obj, ATOM_TO_JSID(atom), JSACC_READ, vp, &attrs);
}
static JSBool
CheckCtorSetAccess(JSContext *cx, JSObject *obj, jsid id, Value *vp)
{
JSAtom *atom = cx->runtime->atomState.constructorAtom;
JS_ASSERT(id == ATOM_TO_JSID(atom));
uintN attrs;
return CheckAccess(cx, obj, ATOM_TO_JSID(atom), JSACC_WRITE, vp, &attrs);
}
JSBool
js_SetClassPrototype(JSContext *cx, JSObject *ctor, JSObject *proto, uintN attrs)
{
/*
* Use the given attributes for the prototype property of the constructor,
* as user-defined constructors have a DontDelete prototype (which may be
* reset), while native or "system" constructors have DontEnum | ReadOnly |
* DontDelete.
*/
if (!ctor->defineProperty(cx, ATOM_TO_JSID(cx->runtime->atomState.classPrototypeAtom),
ObjectOrNullValue(proto), PropertyStub, PropertyStub, 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), CheckCtorGetAccess, CheckCtorSetAccess, 0);
}
JSBool
js_PrimitiveToObject(JSContext *cx, Value *vp)
{
Value v = *vp;
JS_ASSERT(v.isPrimitive());
Class *clasp;
if (v.isNumber())
clasp = &js_NumberClass;
else if (v.isString())
clasp = &js_StringClass;
else
clasp = &js_BooleanClass;
JSObject *obj = NewBuiltinClassInstance(cx, clasp);
if (!obj)
return JS_FALSE;
obj->setPrimitiveThis(v);
vp->setObject(*obj);
return JS_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 {
Value tmp = v;
if (!js_PrimitiveToObject(cx, &tmp))
return JS_FALSE;
obj = &tmp.toObject();
}
*objp = obj;
return JS_TRUE;
}
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 argv[1];
argv[0].setString(ATOM_TO_STRING(cx->runtime->atomState.typeAtoms[type]));
return js_TryMethod(cx, obj, cx->runtime->atomState.valueOfAtom,
1, argv, rval);
}
JSBool
js_TryMethod(JSContext *cx, JSObject *obj, JSAtom *atom,
uintN argc, Value *argv, Value *rval)
{
JS_CHECK_RECURSION(cx, return JS_FALSE);
/*
* Report failure only if an appropriate method was found, and calling it
* returned failure. We propagate failure in this case to make exceptions
* behave properly.
*/
JSErrorReporter older = JS_SetErrorReporter(cx, NULL);
jsid id = ATOM_TO_JSID(atom);
Value fval;
JSBool ok = js_GetMethod(cx, obj, id, JSGET_NO_METHOD_BARRIER, &fval);
JS_SetErrorReporter(cx, older);
if (!ok)
return false;
if (fval.isPrimitive())
return JS_TRUE;
return InternalCall(cx, obj, fval, argc, argv, rval);
}
#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;
static void
MeterEntryCount(uintN count)
{
JS_BASIC_STATS_ACCUM(&js_entry_count_bs, count);
}
void
js_DumpScopeMeters(JSRuntime *rt)
{
static FILE *logfp;
if (!logfp)
logfp = fopen("/tmp/scope.stats", "a");
{
double mean, sigma;
mean = JS_MeanAndStdDevBS(&js_entry_count_bs, &sigma);
fprintf(logfp, "scopes %u entries %g mean %g sigma %g max %u",
js_entry_count_bs.num, js_entry_count_bs.sum, mean, sigma,
js_entry_count_bs.max);
}
JS_DumpHistogram(&js_entry_count_bs, logfp);
JS_BASIC_STATS_INIT(&js_entry_count_bs);
fflush(logfp);
}
#endif
#ifdef DEBUG
void
js_PrintObjectSlotName(JSTracer *trc, char *buf, size_t bufsize)
{
JS_ASSERT(trc->debugPrinter == js_PrintObjectSlotName);
JSObject *obj = (JSObject *)trc->debugPrintArg;
uint32 slot = (uint32)trc->debugPrintIndex;
JS_ASSERT(slot >= JSSLOT_START(obj->getClass()));
JSScopeProperty *sprop;
if (obj->isNative()) {
JSScope *scope = obj->scope();
sprop = scope->lastProperty();
while (sprop && sprop->slot != slot)
sprop = sprop->parent;
} else {
sprop = NULL;
}
if (!sprop) {
const char *slotname = NULL;
Class *clasp = obj->getClass();
if (clasp->flags & JSCLASS_IS_GLOBAL) {
uint32 key = slot - JSSLOT_START(clasp);
#define JS_PROTO(name,code,init) \
if ((code) == key) { slotname = js_##name##_str; goto found; }
#include "jsproto.tbl"
#undef JS_PROTO
}
found:
if (slotname)
JS_snprintf(buf, bufsize, "CLASS_OBJECT(%s)", slotname);
else
JS_snprintf(buf, bufsize, "**UNKNOWN SLOT %ld**", (long)slot);
} else {
jsid id = sprop->id;
if (JSID_IS_INT(id)) {
JS_snprintf(buf, bufsize, "%ld", (long)JSID_TO_INT(id));
} else if (JSID_IS_ATOM(id)) {
js_PutEscapedString(buf, bufsize, JSID_TO_STRING(id), 0);
} else {
JS_snprintf(buf, bufsize, "**FINALIZED ATOM KEY**");
}
}
}
#endif
void
js_TraceObject(JSTracer *trc, JSObject *obj)
{
JS_ASSERT(obj->isNative());
JSContext *cx = trc->context;
JSScope *scope = obj->scope();
if (!scope->isSharedEmpty() && IS_GC_MARKING_TRACER(trc)) {
/*
* Check whether we should shrink the object's slots. Skip this check
* if the scope is shared, since for Block objects and flat closures
* that share their scope, scope->freeslot can be an underestimate.
*/
size_t slots = scope->freeslot;
if (obj->numSlots() != slots)
obj->shrinkSlots(cx, slots);
}
#ifdef JS_DUMP_SCOPE_METERS
MeterEntryCount(scope->entryCount);
#endif
scope->trace(trc);
if (!JS_CLIST_IS_EMPTY(&cx->runtime->watchPointList))
js_TraceWatchPoints(trc, obj);
/* No one runs while the GC is running, so we can use LOCKED_... here. */
Class *clasp = obj->getClass();
if (clasp->mark) {
if (clasp->flags & JSCLASS_MARK_IS_TRACE)
((JSTraceOp) clasp->mark)(trc, obj);
else if (IS_GC_MARKING_TRACER(trc))
(void) clasp->mark(cx, obj, trc);
}
if (clasp->flags & JSCLASS_IS_GLOBAL) {
JSCompartment *compartment = obj->getCompartment(cx);
compartment->marked = true;
}
/*
* An unmutated object that shares a prototype object's scope. We can't
* tell how many slots are in use in obj by looking at its scope, so we
* use obj->numSlots().
*
* NB: In case clasp->mark mutates something, leave this code here --
* don't move it up and unify it with the |if (!traceScope)| section
* above.
*/
uint32 nslots = obj->numSlots();
if (!scope->isSharedEmpty() && scope->freeslot < nslots)
nslots = scope->freeslot;
JS_ASSERT(nslots >= JSSLOT_START(clasp));
for (uint32 i = JSSLOT_START(clasp); i != nslots; ++i) {
const Value &v = obj->getSlot(i);
JS_SET_TRACING_DETAILS(trc, js_PrintObjectSlotName, obj, i);
MarkValueRaw(trc, v);
}
}
void
js_ClearNative(JSContext *cx, JSObject *obj)
{
/*
* Clear our scope and the property cache of all obj's properties only if
* obj owns the scope (i.e., not if obj is sharing another object's scope).
* NB: we do not clear any reserved slots lying below JSSLOT_FREE(clasp).
*/
JS_LOCK_OBJ(cx, obj);
JSScope *scope = obj->scope();
if (!scope->isSharedEmpty()) {
/* Now that we're done using scope->lastProp/table, clear scope. */
scope->clear(cx);
/* Clear slot values and reset freeslot so we're consistent. */
uint32 freeslot = JSSLOT_FREE(obj->getClass());
uint32 n = obj->numSlots();
for (uint32 i = freeslot; i < n; ++i)
obj->setSlot(i, UndefinedValue());
scope->freeslot = freeslot;
}
JS_UNLOCK_OBJ(cx, obj);
}
bool
js_GetReservedSlot(JSContext *cx, JSObject *obj, uint32 index, Value *vp)
{
if (!obj->isNative()) {
vp->setUndefined();
return true;
}
uint32 slot = JSSLOT_START(obj->getClass()) + index;
JS_LOCK_OBJ(cx, obj);
if (slot < obj->numSlots())
*vp = obj->getSlot(slot);
else
vp->setUndefined();
JS_UNLOCK_OBJ(cx, obj);
return true;
}
bool
js_SetReservedSlot(JSContext *cx, JSObject *obj, uint32 index, const Value &v)
{
if (!obj->isNative())
return true;
Class *clasp = obj->getClass();
uint32 slot = JSSLOT_START(clasp) + index;
JS_LOCK_OBJ(cx, obj);
if (slot >= obj->numSlots()) {
/*
* At this point, obj may or may not own scope, and we may or may not
* need to allocate slots. If scope is shared, scope->freeslot may not
* be accurate for obj (see comment below).
*/
uint32 nslots = JSSLOT_FREE(clasp);
JS_ASSERT(slot < nslots);
if (!obj->allocSlots(cx, nslots)) {
JS_UNLOCK_OBJ(cx, obj);
return false;
}
}
/*
* Whether or not we grew nslots, we may need to advance freeslot.
*
* If scope is shared, do not modify scope->freeslot. It is OK for freeslot
* to be an underestimate in objects with shared scopes, as they will get
* their own scopes before mutating, and elsewhere (e.g. js_TraceObject) we
* use obj->numSlots() rather than rely on freeslot.
*/
JSScope *scope = obj->scope();
if (!scope->isSharedEmpty() && slot >= scope->freeslot)
scope->freeslot = slot + 1;
obj->setSlot(slot, v);
GC_POKE(cx, JS_NULL);
JS_UNLOCK_SCOPE(cx, scope);
return true;
}
JSObject *
JSObject::wrappedObject(JSContext *cx) const
{
if (JSObjectOp op = getClass()->ext.wrappedObject) {
if (JSObject *obj = op(cx, const_cast<JSObject *>(this)))
return obj;
}
return const_cast<JSObject *>(this);
}
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);
}
JSCompartment *
JSObject::getCompartment(JSContext *cx)
{
JSObject *obj = getGlobal();
Class *clasp = obj->getClass();
if (!(clasp->flags & JSCLASS_IS_GLOBAL)) {
// The magic AnyName object is runtime-wide.
if (clasp == &js_AnyNameClass)
return cx->runtime->defaultCompartment;
// The magic function namespace object is runtime-wide.
if (clasp == &js_NamespaceClass &&
obj->getNameURI() == ATOM_TO_JSVAL(cx->runtime->atomState.lazy.functionNamespaceURIAtom)) {
return cx->runtime->defaultCompartment;
}
// Compile-time Function, Block, and RegExp objects are not parented.
if (clasp == &js_FunctionClass || clasp == &js_BlockClass || clasp == &js_RegExpClass) {
// This is a bogus answer, but it'll do for now.
return cx->runtime->defaultCompartment;
}
JS_NOT_REACHED("non-global object at end of scope chain");
}
const Value &v = obj->getReservedSlot(JSRESERVED_GLOBAL_COMPARTMENT);
return (JSCompartment *)v.toPrivate();
}
JS_FRIEND_API(JSBool)
js_GetterOnlyPropertyStub(JSContext *cx, JSObject *obj, jsid id, 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)
{
dumpChars(str->chars(), str->length());
}
JS_FRIEND_API(void)
js_DumpString(JSString *str)
{
fprintf(stderr, "JSString* (%p) = jschar * (%p) = ",
(void *) str, (void *) str->chars());
dumpString(str);
fputc('\n', stderr);
}
JS_FRIEND_API(void)
js_DumpAtom(JSAtom *atom)
{
fprintf(stderr, "JSAtom* (%p) = ", (void *) atom);
js_DumpString(ATOM_TO_STRING(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);
fprintf(stderr, "<%s %s at %p (JSFunction at %p)>",
fun->atom ? "function" : "unnamed",
fun->atom ? JS_GetStringBytes(ATOM_TO_STRING(fun->atom)) : "function",
(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
dumpScopeProp(JSScopeProperty *sprop)
{
jsid id = sprop->id;
uint8 attrs = sprop->attributes();
fprintf(stderr, " ");
if (attrs & JSPROP_ENUMERATE) fprintf(stderr, "enumerate ");
if (attrs & JSPROP_READONLY) fprintf(stderr, "readonly ");
if (attrs & JSPROP_PERMANENT) fprintf(stderr, "permanent ");
if (attrs & JSPROP_GETTER) fprintf(stderr, "getter ");
if (attrs & JSPROP_SETTER) fprintf(stderr, "setter ");
if (attrs & JSPROP_SHARED) fprintf(stderr, "shared ");
if (sprop->isAlias()) fprintf(stderr, "alias ");
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", sprop->slot);
fprintf(stderr, "\n");
}
JS_FRIEND_API(void)
js_DumpObject(JSObject *obj)
{
uint32 i, slots;
Class *clasp;
jsuint reservedEnd;
fprintf(stderr, "object %p\n", (void *) obj);
clasp = obj->getClass();
fprintf(stderr, "class %p %s\n", (void *)clasp, clasp->name);
if (obj->isDenseArray()) {
slots = JS_MIN(obj->getArrayLength(), obj->getDenseArrayCapacity());
fprintf(stderr, "elements\n");
for (i = 0; i < slots; i++) {
fprintf(stderr, " %3d: ", i);
dumpValue(obj->getDenseArrayElement(i));
fprintf(stderr, "\n");
fflush(stderr);
}
return;
}
if (obj->isNative()) {
JSScope *scope = obj->scope();
if (scope->sealed())
fprintf(stderr, "sealed\n");
fprintf(stderr, "properties:\n");
for (JSScopeProperty *sprop = scope->lastProperty(); sprop;
sprop = sprop->parent) {
dumpScopeProp(sprop);
}
} else {
if (!obj->isNative())
fprintf(stderr, "not native\n");
}
fprintf(stderr, "proto ");
dumpValue(ObjectOrNullValue(obj->getProto()));
fputc('\n', stderr);
fprintf(stderr, "parent ");
dumpValue(ObjectOrNullValue(obj->getParent()));
fputc('\n', stderr);
i = JSSLOT_PRIVATE;
if (clasp->flags & JSCLASS_HAS_PRIVATE) {
i = JSSLOT_PRIVATE + 1;
fprintf(stderr, "private %p\n", obj->getPrivate());
}
fprintf(stderr, "slots:\n");
reservedEnd = i + JSCLASS_RESERVED_SLOTS(clasp);
slots = (obj->isNative() && !obj->scope()->isSharedEmpty())
? obj->scope()->freeslot
: obj->numSlots();
for (; i < slots; i++) {
fprintf(stderr, " %3d ", i);
if (i < reservedEnd)
fprintf(stderr, "(reserved) ");
fprintf(stderr, "= ");
dumpValue(obj->getSlot(i));
fputc('\n', stderr);
}
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->fp;
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->argv) {
fprintf(stderr, "callee: ");
dumpValue(fp->argv[-2]);
} else {
fprintf(stderr, "global frame, no callee");
}
fputc('\n', stderr);
if (fp->hasScript()) {
fprintf(stderr, "file %s line %u\n",
fp->getScript()->filename, (unsigned) fp->getScript()->lineno);
}
if (jsbytecode *pc = i.pc()) {
if (!fp->hasScript()) {
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->getIMacroPC();
} 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);
}
}
fprintf(stderr, " argv: %p (argc: %u)\n",
(void *) fp->argv, (unsigned) fp->numActualArgs());
MaybeDumpObject("callobj", fp->maybeCallObj());
MaybeDumpObject("argsobj", fp->maybeArgsObj());
MaybeDumpValue("this", fp->getThisValue());
fprintf(stderr, " rval: ");
dumpValue(fp->getReturnValue());
fputc('\n', stderr);
fprintf(stderr, " flags:");
if (fp->flags == 0)
fprintf(stderr, " none");
if (fp->flags & JSFRAME_CONSTRUCTING)
fprintf(stderr, " constructing");
if (fp->flags & JSFRAME_COMPUTED_THIS)
fprintf(stderr, " computed_this");
if (fp->flags & JSFRAME_ASSIGNING)
fprintf(stderr, " assigning");
if (fp->flags & JSFRAME_DEBUGGER)
fprintf(stderr, " debugger");
if (fp->flags & JSFRAME_EVAL)
fprintf(stderr, " eval");
if (fp->flags & JSFRAME_YIELDING)
fprintf(stderr, " yielding");
if (fp->flags & JSFRAME_GENERATOR)
fprintf(stderr, " generator");
if (fp->flags & JSFRAME_OVERRIDE_ARGS)
fprintf(stderr, " overridden_args");
fputc('\n', stderr);
if (fp->hasScopeChain())
fprintf(stderr, " scopeChain: (JSObject *) %p\n", (void *) fp->getScopeChain());
if (fp->hasBlockChain())
fprintf(stderr, " blockChain: (JSObject *) %p\n", (void *) fp->getBlockChain());
fputc('\n', stderr);
}
}
#endif
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