https://github.com/mozilla/gecko-dev
Tip revision: 56a44f24366557e5532147cf28cd14f306f47c46 authored by Mats Palmgren on 31 May 2012, 18:03:59 UTC
Bug 759788: hold a strong ref to the nsPluginInstanceOwner in DoStopPlugin to avoid crashes, r=bsmedberg, a=akeybl
Bug 759788: hold a strong ref to the nsPluginInstanceOwner in DoStopPlugin to avoid crashes, r=bsmedberg, a=akeybl
Tip revision: 56a44f2
jsobj.cpp
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sw=4 et tw=79:
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* JS object implementation.
*/
#include <stdlib.h>
#include <string.h>
#include "mozilla/Util.h"
#include "jstypes.h"
#include "jsutil.h"
#include "jshash.h"
#include "jsdhash.h"
#include "jsprf.h"
#include "jsapi.h"
#include "jsarray.h"
#include "jsatom.h"
#include "jsbool.h"
#include "jscntxt.h"
#include "jsversion.h"
#include "jsfun.h"
#include "jsgc.h"
#include "jsgcmark.h"
#include "jsinterp.h"
#include "jsiter.h"
#include "jslock.h"
#include "jsnum.h"
#include "jsobj.h"
#include "jsonparser.h"
#include "jsopcode.h"
#include "jsprobes.h"
#include "jsproxy.h"
#include "jsscope.h"
#include "jsscript.h"
#include "jsstr.h"
#include "jsdbgapi.h"
#include "json.h"
#include "jswatchpoint.h"
#include "jswrapper.h"
#include "builtin/MapObject.h"
#include "frontend/BytecodeCompiler.h"
#include "frontend/BytecodeEmitter.h"
#include "frontend/Parser.h"
#include "js/MemoryMetrics.h"
#include "jsarrayinlines.h"
#include "jsatominlines.h"
#include "jsinterpinlines.h"
#include "jsobjinlines.h"
#include "jsscopeinlines.h"
#include "jsscriptinlines.h"
#include "vm/MethodGuard-inl.h"
#include "vm/StringBuffer-inl.h"
#if JS_HAS_XML_SUPPORT
#include "jsxml.h"
#endif
#if JS_HAS_XDR
#include "jsxdrapi.h"
#endif
#include "jsautooplen.h"
using namespace mozilla;
using namespace js;
using namespace js::gc;
using namespace js::types;
JS_STATIC_ASSERT(int32_t((JSObject::NELEMENTS_LIMIT - 1) * sizeof(Value)) == int64_t((JSObject::NELEMENTS_LIMIT - 1) * sizeof(Value)));
Class js::ObjectClass = {
js_Object_str,
JSCLASS_HAS_CACHED_PROTO(JSProto_Object),
JS_PropertyStub, /* addProperty */
JS_PropertyStub, /* delProperty */
JS_PropertyStub, /* getProperty */
JS_StrictPropertyStub, /* setProperty */
JS_EnumerateStub,
JS_ResolveStub,
JS_ConvertStub
};
JS_FRIEND_API(JSObject *)
JS_ObjectToInnerObject(JSContext *cx, JSObject *obj)
{
if (!obj) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_INACTIVE);
return NULL;
}
OBJ_TO_INNER_OBJECT(cx, obj);
return obj;
}
JS_FRIEND_API(JSObject *)
JS_ObjectToOuterObject(JSContext *cx, JSObject *obj)
{
OBJ_TO_OUTER_OBJECT(cx, obj);
return obj;
}
#if JS_HAS_OBJ_PROTO_PROP
static JSBool
obj_getProto(JSContext *cx, JSObject *obj, jsid id, Value *vp);
static JSBool
obj_setProto(JSContext *cx, JSObject *obj, jsid id, JSBool strict, Value *vp);
JSPropertySpec object_props[] = {
{js_proto_str, 0, JSPROP_PERMANENT|JSPROP_SHARED, obj_getProto, 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. */
unsigned attrs;
id = ATOM_TO_JSID(cx->runtime->atomState.protoAtom);
return CheckAccess(cx, obj, id, JSACC_PROTO, vp, &attrs);
}
size_t sSetProtoCalled = 0;
static JSBool
obj_setProto(JSContext *cx, JSObject *obj, jsid id, JSBool strict, Value *vp)
{
if (!cx->runningWithTrustedPrincipals())
++sSetProtoCalled;
/* ECMAScript 5 8.6.2 forbids changing [[Prototype]] if not [[Extensible]]. */
if (!obj->isExtensible()) {
obj->reportNotExtensible(cx);
return false;
}
if (!vp->isObjectOrNull())
return true;
JSObject *pobj = vp->toObjectOrNull();
unsigned attrs;
id = ATOM_TO_JSID(cx->runtime->atomState.protoAtom);
if (!CheckAccess(cx, obj, id, JSAccessMode(JSACC_PROTO|JSACC_WRITE), vp, &attrs))
return false;
return SetProto(cx, obj, pobj, true);
}
#else /* !JS_HAS_OBJ_PROTO_PROP */
#define object_props NULL
#endif /* !JS_HAS_OBJ_PROTO_PROP */
static bool
MarkSharpObjects(JSContext *cx, JSObject *obj, JSIdArray **idap, JSSharpInfo *value)
{
JS_CHECK_RECURSION(cx, return NULL);
JSIdArray *ida;
JSSharpObjectMap *map = &cx->sharpObjectMap;
JS_ASSERT(map->depth >= 1);
JSSharpInfo sharpid;
JSSharpTable::Ptr p = map->table.lookup(obj);
if (!p) {
if (!map->table.put(obj, sharpid))
return false;
ida = JS_Enumerate(cx, obj);
if (!ida)
return false;
bool ok = true;
for (int i = 0, length = ida->length; i < length; i++) {
jsid id = ida->vector[i];
JSObject *obj2;
JSProperty *prop;
ok = obj->lookupGeneric(cx, id, &obj2, &prop);
if (!ok)
break;
if (!prop)
continue;
bool hasGetter, hasSetter;
AutoValueRooter v(cx);
AutoValueRooter setter(cx);
if (obj2->isNative()) {
const Shape *shape = (Shape *) prop;
hasGetter = shape->hasGetterValue();
hasSetter = shape->hasSetterValue();
if (hasGetter)
v.set(shape->getterValue());
if (hasSetter)
setter.set(shape->setterValue());
} else {
hasGetter = hasSetter = false;
}
if (hasSetter) {
/* Mark the getter, then set val to setter. */
if (hasGetter && v.value().isObject()) {
ok = MarkSharpObjects(cx, &v.value().toObject(), NULL, NULL);
if (!ok)
break;
}
v.set(setter.value());
} else if (!hasGetter) {
ok = obj->getGeneric(cx, id, v.addr());
if (!ok)
break;
}
if (v.value().isObject() && !MarkSharpObjects(cx, &v.value().toObject(), NULL, NULL)) {
ok = false;
break;
}
}
if (!ok || !idap)
JS_DestroyIdArray(cx, ida);
if (!ok)
return false;
} else {
if (!p->value.hasGen && !p->value.isSharp) {
p->value.hasGen = true;
}
sharpid = p->value;
ida = NULL;
}
if (idap)
*idap = ida;
if (value)
*value = sharpid;
return true;
}
bool
js_EnterSharpObject(JSContext *cx, JSObject *obj, JSIdArray **idap, bool *alreadySeen, bool *isSharp)
{
if (!JS_CHECK_OPERATION_LIMIT(cx))
return false;
*alreadySeen = false;
JSSharpObjectMap *map = &cx->sharpObjectMap;
JS_ASSERT_IF(map->depth == 0, map->table.count() == 0);
JS_ASSERT_IF(map->table.count() == 0, map->depth == 0);
JSSharpTable::Ptr p;
JSSharpInfo sharpid;
JSIdArray *ida = NULL;
/* From this point the control must flow either through out: or bad:. */
if (map->depth == 0) {
JS_KEEP_ATOMS(cx->runtime);
/*
* 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 = 1;
bool success = MarkSharpObjects(cx, obj, &ida, &sharpid);
JS_ASSERT(map->depth == 1);
map->depth = 0;
if (!success)
goto bad;
JS_ASSERT(!sharpid.isSharp);
if (!idap) {
JS_DestroyIdArray(cx, ida);
ida = NULL;
}
} else {
/*
* 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.
*/
p = map->table.lookup(obj);
if (!p) {
if (!map->table.put(obj, sharpid))
goto bad;
goto out;
}
sharpid = p->value;
}
if (sharpid.isSharp || sharpid.hasGen)
*alreadySeen = true;
out:
if (!sharpid.isSharp) {
if (idap && !ida) {
ida = JS_Enumerate(cx, obj);
if (!ida)
goto bad;
}
map->depth++;
}
if (idap)
*idap = ida;
*isSharp = sharpid.isSharp;
return true;
bad:
/* Clean up the sharpObjectMap table on outermost error. */
if (map->depth == 0) {
JS_UNKEEP_ATOMS(cx->runtime);
map->sharpgen = 0;
map->table.clear();
}
return false;
}
void
js_LeaveSharpObject(JSContext *cx, JSIdArray **idap)
{
JSSharpObjectMap *map = &cx->sharpObjectMap;
JS_ASSERT(map->depth > 0);
if (--map->depth == 0) {
JS_UNKEEP_ATOMS(cx->runtime);
map->sharpgen = 0;
map->table.clear();
}
if (idap) {
if (JSIdArray *ida = *idap) {
JS_DestroyIdArray(cx, ida);
*idap = NULL;
}
}
}
void
js_TraceSharpMap(JSTracer *trc, JSSharpObjectMap *map)
{
JS_ASSERT(map->depth > 0);
/*
* 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.
*/
for (JSSharpTable::Range r = map->table.all(); !r.empty(); r.popFront()) {
JSObject *tmp = r.front().key;
MarkObjectRoot(trc, &tmp, "sharp table entry");
JS_ASSERT(tmp == r.front().key);
}
}
#if JS_HAS_TOSOURCE
static JSBool
obj_toSource(JSContext *cx, unsigned argc, Value *vp)
{
bool comma = false;
const jschar *vchars;
size_t vlength;
Value *val;
JSString *gsop[2];
JS_CHECK_RECURSION(cx, return JS_FALSE);
Value localroot[4];
PodArrayZero(localroot);
AutoArrayRooter tvr(cx, ArrayLength(localroot), localroot);
/* If outermost, we need parentheses to be an expression, not a block. */
bool outermost = (cx->sharpObjectMap.depth == 0);
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return false;
JSIdArray *ida;
bool alreadySeen = false;
bool isSharp = false;
if (!js_EnterSharpObject(cx, obj, &ida, &alreadySeen, &isSharp))
return false;
if (!ida) {
/*
* We've already seen obj, so don't serialize it again (particularly as
* we might recur in the process): just serialize an empty object.
*/
JS_ASSERT(alreadySeen);
JSString *str = js_NewStringCopyZ(cx, "{}");
if (!str)
return false;
vp->setString(str);
return true;
}
JS_ASSERT(!isSharp);
if (alreadySeen) {
JSSharpTable::Ptr p = cx->sharpObjectMap.table.lookup(obj);
JS_ASSERT(p);
JS_ASSERT(!p->value.isSharp);
p->value.isSharp = true;
}
/* Automatically call js_LeaveSharpObject when we leave this frame. */
class AutoLeaveSharpObject {
JSContext *cx;
JSIdArray *ida;
public:
AutoLeaveSharpObject(JSContext *cx, JSIdArray *ida) : cx(cx), ida(ida) {}
~AutoLeaveSharpObject() {
js_LeaveSharpObject(cx, &ida);
}
} autoLeaveSharpObject(cx, ida);
StringBuffer buf(cx);
if (outermost && !buf.append('('))
return false;
if (!buf.append('{'))
return false;
/*
* 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 (int i = 0; i < ida->length; i++) {
/* Get strings for id and value and GC-root them via vp. */
jsid id = ida->vector[i];
JSLinearString *idstr;
JSObject *obj2;
JSProperty *prop;
if (!obj->lookupGeneric(cx, id, &obj2, &prop))
return false;
/*
* Convert id to a value and then to a string. Decide early whether we
* prefer get/set or old getter/setter syntax.
*/
JSString *s = ToString(cx, IdToValue(id));
if (!s || !(idstr = s->ensureLinear(cx)))
return false;
int valcnt = 0;
if (prop) {
bool doGet = true;
if (obj2->isNative()) {
const Shape *shape = (Shape *) prop;
unsigned attrs = shape->attributes();
if (attrs & JSPROP_GETTER) {
doGet = false;
val[valcnt] = shape->getterValue();
gsop[valcnt] = cx->runtime->atomState.getAtom;
valcnt++;
}
if (attrs & JSPROP_SETTER) {
doGet = false;
val[valcnt] = shape->setterValue();
gsop[valcnt] = cx->runtime->atomState.setAtom;
valcnt++;
}
}
if (doGet) {
valcnt = 1;
gsop[0] = NULL;
if (!obj->getGeneric(cx, id, &val[0]))
return false;
}
}
/*
* If id is a string that's not an identifier, or if it's a negative
* integer, then it must be quoted.
*/
if (JSID_IS_ATOM(id)
? !IsIdentifier(idstr)
: (!JSID_IS_INT(id) || JSID_TO_INT(id) < 0)) {
s = js_QuoteString(cx, idstr, jschar('\''));
if (!s || !(idstr = s->ensureLinear(cx)))
return false;
}
for (int 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. */
JSString *valstr = js_ValueToSource(cx, val[j]);
if (!valstr)
return false;
localroot[j].setString(valstr); /* local root */
vchars = valstr->getChars(cx);
if (!vchars)
return false;
vlength = valstr->length();
/*
* 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_t 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;
}
}
if (comma && !buf.append(", "))
return false;
comma = true;
if (gsop[j])
if (!buf.append(gsop[j]) || !buf.append(' '))
return false;
if (!buf.append(idstr))
return false;
if (!buf.append(gsop[j] ? ' ' : ':'))
return false;
if (!buf.append(vchars, vlength))
return false;
}
}
if (!buf.append('}'))
return false;
if (outermost && !buf.append(')'))
return false;
JSString *str = buf.finishString();
if (!str)
return false;
vp->setString(str);
return true;
}
#endif /* JS_HAS_TOSOURCE */
namespace js {
JSString *
obj_toStringHelper(JSContext *cx, JSObject *obj)
{
if (obj->isProxy())
return Proxy::obj_toString(cx, obj);
StringBuffer sb(cx);
const char *className = obj->getClass()->name;
if (!sb.append("[object ") || !sb.appendInflated(className, strlen(className)) ||
!sb.append("]"))
{
return NULL;
}
return sb.finishString();
}
JSObject *
NonNullObject(JSContext *cx, const Value &v)
{
if (v.isPrimitive()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_NOT_NONNULL_OBJECT);
return NULL;
}
return &v.toObject();
}
const char *
InformalValueTypeName(const Value &v)
{
if (v.isObject())
return v.toObject().getClass()->name;
if (v.isString())
return "string";
if (v.isNumber())
return "number";
if (v.isBoolean())
return "boolean";
if (v.isNull())
return "null";
if (v.isUndefined())
return "undefined";
return "value";
}
} /* namespace js */
/* ES5 15.2.4.2. Note steps 1 and 2 are errata. */
static JSBool
obj_toString(JSContext *cx, unsigned argc, Value *vp)
{
Value &thisv = vp[1];
/* Step 1. */
if (thisv.isUndefined()) {
vp->setString(cx->runtime->atomState.objectUndefinedAtom);
return true;
}
/* Step 2. */
if (thisv.isNull()) {
vp->setString(cx->runtime->atomState.objectNullAtom);
return true;
}
/* Step 3. */
JSObject *obj = ToObject(cx, &thisv);
if (!obj)
return false;
/* Steps 4-5. */
JSString *str = js::obj_toStringHelper(cx, obj);
if (!str)
return false;
vp->setString(str);
return true;
}
/* ES5 15.2.4.3. */
static JSBool
obj_toLocaleString(JSContext *cx, unsigned argc, Value *vp)
{
JS_CHECK_RECURSION(cx, return false);
/* Step 1. */
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return false;
/* Steps 2-4. */
return obj->callMethod(cx, ATOM_TO_JSID(cx->runtime->atomState.toStringAtom), 0, NULL, vp);
}
static JSBool
obj_valueOf(JSContext *cx, unsigned argc, Value *vp)
{
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return false;
vp->setObject(*obj);
return true;
}
/* We should be able to assert this for *any* fp->scopeChain(). */
static void
AssertInnerizedScopeChain(JSContext *cx, JSObject &scopeobj)
{
#ifdef DEBUG
for (JSObject *o = &scopeobj; o; o = o->enclosingScope()) {
if (JSObjectOp op = o->getClass()->ext.innerObject)
JS_ASSERT(op(cx, o) == o);
}
#endif
}
#ifndef EVAL_CACHE_CHAIN_LIMIT
# define EVAL_CACHE_CHAIN_LIMIT 4
#endif
static inline JSScript **
EvalCacheHash(JSContext *cx, JSLinearString *str)
{
const jschar *s = str->chars();
size_t n = str->length();
if (n > 100)
n = 100;
uint32_t h;
for (h = 0; n; s++, n--)
h = JS_ROTATE_LEFT32(h, 4) ^ *s;
h *= JS_GOLDEN_RATIO;
h >>= 32 - JS_EVAL_CACHE_SHIFT;
return &cx->compartment->evalCache[h];
}
static JS_ALWAYS_INLINE JSScript *
EvalCacheLookup(JSContext *cx, JSLinearString *str, StackFrame *caller, unsigned staticLevel,
JSPrincipals *principals, JSObject &scopeobj, JSScript **bucket)
{
/*
* Cache local eval scripts indexed by source qualified by scope.
*
* An eval cache entry should never be considered a hit unless its
* strictness matches that of the new eval code. The existing code takes
* care of this, because hits are qualified by the function from which
* eval was called, whose strictness doesn't change. (We don't cache evals
* in eval code, so the calling function corresponds to the calling script,
* and its strictness never varies.) Scripts produced by calls to eval from
* global code aren't cached.
*
* FIXME bug 620141: Qualify hits by calling script rather than function.
* Then we wouldn't need the unintuitive !isEvalFrame() hack in EvalKernel
* to avoid caching nested evals in functions (thus potentially mismatching
* on strict mode), and we could cache evals in global code if desired.
*/
unsigned count = 0;
JSScript **scriptp = bucket;
JSVersion version = cx->findVersion();
JSScript *script;
JSSubsumePrincipalsOp subsume = cx->runtime->securityCallbacks->subsumePrincipals;
while ((script = *scriptp) != NULL) {
if (script->savedCallerFun &&
script->staticLevel == staticLevel &&
script->getVersion() == version &&
!script->hasSingletons &&
(!subsume || script->principals == principals ||
(subsume(principals, script->principals) &&
subsume(script->principals, principals)))) {
/*
* Get the prior (cache-filling) eval's saved caller function.
* See frontend::CompileScript.
*/
JSFunction *fun = script->getCallerFunction();
if (fun == caller->fun()) {
/*
* Get the source string passed for safekeeping in the atom map
* by the prior eval to frontend::CompileScript.
*/
JSAtom *src = script->atoms[0];
if (src == str || EqualStrings(src, str)) {
/*
* Source matches. Make sure there are no inner objects
* which might use the wrong parent and/or call scope by
* reusing the previous eval's script. Skip the script's
* first object, which entrains the eval's scope.
*/
JS_ASSERT(script->objects()->length >= 1);
if (script->objects()->length == 1 &&
!JSScript::isValidOffset(script->regexpsOffset)) {
JS_ASSERT(staticLevel == script->staticLevel);
*scriptp = script->evalHashLink();
script->evalHashLink() = NULL;
return script;
}
}
}
}
if (++count == EVAL_CACHE_CHAIN_LIMIT)
return NULL;
scriptp = &script->evalHashLink();
}
return NULL;
}
/*
* There are two things we want to do with each script executed in EvalKernel:
* 1. notify jsdbgapi about script creation/destruction
* 2. add the script to the eval cache when EvalKernel is finished
*
* NB: Although the eval cache keeps a script alive wrt to the JS engine, from
* a jsdbgapi user's perspective, we want each eval() to create and destroy a
* script. This hides implementation details and means we don't have to deal
* with calls to JS_GetScriptObject for scripts in the eval cache (currently,
* script->object aliases script->evalHashLink()).
*/
class EvalScriptGuard
{
JSContext *cx_;
JSLinearString *str_;
JSScript **bucket_;
JSScript *script_;
public:
EvalScriptGuard(JSContext *cx, JSLinearString *str)
: cx_(cx),
str_(str),
script_(NULL) {
bucket_ = EvalCacheHash(cx, str);
}
~EvalScriptGuard() {
if (script_) {
js_CallDestroyScriptHook(cx_, script_);
script_->isActiveEval = false;
script_->isCachedEval = true;
script_->evalHashLink() = *bucket_;
*bucket_ = script_;
}
}
void lookupInEvalCache(StackFrame *caller, unsigned staticLevel,
JSPrincipals *principals, JSObject &scopeobj) {
if (JSScript *found = EvalCacheLookup(cx_, str_, caller, staticLevel,
principals, scopeobj, bucket_)) {
js_CallNewScriptHook(cx_, found, NULL);
script_ = found;
script_->isCachedEval = false;
script_->isActiveEval = true;
}
}
void setNewScript(JSScript *script) {
/* NewScriptFromEmitter has already called js_CallNewScriptHook. */
JS_ASSERT(!script_ && script);
script_ = script;
script_->isActiveEval = true;
}
bool foundScript() {
return !!script_;
}
JSScript *script() const {
JS_ASSERT(script_);
return script_;
}
};
/* Define subset of ExecuteType so that casting performs the injection. */
enum EvalType { DIRECT_EVAL = EXECUTE_DIRECT_EVAL, INDIRECT_EVAL = EXECUTE_INDIRECT_EVAL };
/*
* Common code implementing direct and indirect eval.
*
* Evaluate call.argv[2], if it is a string, in the context of the given calling
* frame, with the provided scope chain, with the semantics of either a direct
* or indirect eval (see ES5 10.4.2). If this is an indirect eval, scopeobj
* must be a global object.
*
* On success, store the completion value in call.rval and return true.
*/
static bool
EvalKernel(JSContext *cx, const CallArgs &args, EvalType evalType, StackFrame *caller,
JSObject &scopeobj)
{
JS_ASSERT((evalType == INDIRECT_EVAL) == (caller == NULL));
AssertInnerizedScopeChain(cx, scopeobj);
if (!scopeobj.global().isRuntimeCodeGenEnabled(cx)) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CSP_BLOCKED_EVAL);
return false;
}
/* ES5 15.1.2.1 step 1. */
if (args.length() < 1) {
args.rval().setUndefined();
return true;
}
if (!args[0].isString()) {
args.rval() = args[0];
return true;
}
JSString *str = args[0].toString();
/* ES5 15.1.2.1 steps 2-8. */
/*
* Per ES5, indirect eval runs in the global scope. (eval is specified this
* way so that the compiler can make assumptions about what bindings may or
* may not exist in the current frame if it doesn't see 'eval'.)
*/
unsigned staticLevel;
Value thisv;
if (evalType == DIRECT_EVAL) {
staticLevel = caller->script()->staticLevel + 1;
/*
* Direct calls to eval are supposed to see the caller's |this|. If we
* haven't wrapped that yet, do so now, before we make a copy of it for
* the eval code to use.
*/
if (!ComputeThis(cx, caller))
return false;
thisv = caller->thisValue();
#ifdef DEBUG
jsbytecode *callerPC = caller->pcQuadratic(cx);
JS_ASSERT(callerPC && JSOp(*callerPC) == JSOP_EVAL);
#endif
} else {
JS_ASSERT(args.callee().global() == scopeobj);
staticLevel = 0;
/* Use the global as 'this', modulo outerization. */
JSObject *thisobj = scopeobj.thisObject(cx);
if (!thisobj)
return false;
thisv = ObjectValue(*thisobj);
}
JSLinearString *linearStr = str->ensureLinear(cx);
if (!linearStr)
return false;
const jschar *chars = linearStr->chars();
size_t length = linearStr->length();
/*
* If the eval string starts with '(' or '[' and ends with ')' or ']', it may be JSON.
* Try the JSON parser first because it's much faster. If the eval string
* isn't JSON, JSON parsing will probably fail quickly, so little time
* will be lost.
*
* Don't use the JSON parser if the caller is strict mode code, because in
* strict mode object literals must not have repeated properties, and the
* JSON parser cheerfully (and correctly) accepts them. If you're parsing
* JSON with eval and using strict mode, you deserve to be slow.
*/
if (length > 2 &&
((chars[0] == '[' && chars[length - 1] == ']') ||
(chars[0] == '(' && chars[length - 1] == ')')) &&
(!caller || !caller->script()->strictModeCode))
{
/*
* Remarkably, JavaScript syntax is not a superset of JSON syntax:
* strings in JavaScript cannot contain the Unicode line and paragraph
* terminator characters U+2028 and U+2029, but strings in JSON can.
* Rather than force the JSON parser to handle this quirk when used by
* eval, we simply don't use the JSON parser when either character
* appears in the provided string. See bug 657367.
*/
for (const jschar *cp = &chars[1], *end = &chars[length - 2]; ; cp++) {
if (*cp == 0x2028 || *cp == 0x2029)
break;
if (cp == end) {
bool isArray = (chars[0] == '[');
JSONParser parser(cx, isArray ? chars : chars + 1, isArray ? length : length - 2,
JSONParser::StrictJSON, JSONParser::NoError);
Value tmp;
if (!parser.parse(&tmp))
return false;
if (tmp.isUndefined())
break;
args.rval() = tmp;
return true;
}
}
}
EvalScriptGuard esg(cx, linearStr);
JSPrincipals *principals = PrincipalsForCompiledCode(args, cx);
if (evalType == DIRECT_EVAL && caller->isNonEvalFunctionFrame())
esg.lookupInEvalCache(caller, staticLevel, principals, scopeobj);
if (!esg.foundScript()) {
unsigned lineno;
const char *filename;
JSPrincipals *originPrincipals;
CurrentScriptFileLineOrigin(cx, &filename, &lineno, &originPrincipals,
evalType == DIRECT_EVAL ? CALLED_FROM_JSOP_EVAL
: NOT_CALLED_FROM_JSOP_EVAL);
uint32_t tcflags = TCF_COMPILE_N_GO | TCF_COMPILE_FOR_EVAL;
JSScript *compiled = frontend::CompileScript(cx, &scopeobj, caller,
principals, originPrincipals,
tcflags, chars, length, filename,
lineno, cx->findVersion(), linearStr,
staticLevel);
if (!compiled)
return false;
esg.setNewScript(compiled);
}
return ExecuteKernel(cx, esg.script(), scopeobj, thisv, ExecuteType(evalType),
NULL /* evalInFrame */, &args.rval());
}
/*
* 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.
*/
static inline bool
WarnOnTooManyArgs(JSContext *cx, const CallArgs &args)
{
if (args.length() > 1) {
if (JSScript *script = cx->stack.currentScript()) {
if (!script->warnedAboutTwoArgumentEval) {
static const char TWO_ARGUMENT_WARNING[] =
"Support for eval(code, scopeObject) has been removed. "
"Use |with (scopeObject) eval(code);| instead.";
if (!JS_ReportWarning(cx, TWO_ARGUMENT_WARNING))
return false;
script->warnedAboutTwoArgumentEval = true;
}
} else {
/*
* In the case of an indirect call without a caller frame, avoid a
* potential warning-flood by doing nothing.
*/
}
}
return true;
}
namespace js {
/*
* ES5 15.1.2.1.
*
* NB: This method handles only indirect eval.
*/
JSBool
eval(JSContext *cx, unsigned argc, Value *vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
return WarnOnTooManyArgs(cx, args) &&
EvalKernel(cx, args, INDIRECT_EVAL, NULL, args.callee().global());
}
bool
DirectEval(JSContext *cx, const CallArgs &args)
{
/* Direct eval can assume it was called from an interpreted frame. */
StackFrame *caller = cx->fp();
JS_ASSERT(caller->isScriptFrame());
JS_ASSERT(IsBuiltinEvalForScope(&caller->scopeChain(), args.calleev()));
JS_ASSERT(JSOp(*cx->regs().pc) == JSOP_EVAL);
AutoFunctionCallProbe callProbe(cx, args.callee().toFunction(), caller->script());
JSObject *scopeChain = GetScopeChain(cx, caller);
if (!scopeChain)
return false;
if (!WarnOnTooManyArgs(cx, args))
return false;
return EvalKernel(cx, args, DIRECT_EVAL, caller, *scopeChain);
}
bool
IsBuiltinEvalForScope(JSObject *scopeChain, const Value &v)
{
return scopeChain->global().getOriginalEval() == v;
}
bool
IsAnyBuiltinEval(JSFunction *fun)
{
return fun->maybeNative() == eval;
}
JSPrincipals *
PrincipalsForCompiledCode(const CallReceiver &call, JSContext *cx)
{
JS_ASSERT(IsAnyBuiltinEval(call.callee().toFunction()) ||
IsBuiltinFunctionConstructor(call.callee().toFunction()));
/*
* To compute the principals of the compiled eval/Function code, we simply
* use the callee's principals. To see why the caller's principals are
* ignored, consider first that, in the capability-model we assume, the
* high-privileged eval/Function should never have escaped to the
* low-privileged caller. (For the Mozilla embedding, this is brute-enforced
* by explicit filtering by wrappers.) Thus, the caller's privileges should
* subsume the callee's.
*
* In the converse situation, where the callee has lower privileges than the
* caller, we might initially guess that the caller would want to retain
* their higher privileges in the generated code. However, since the
* compiled code will be run with the callee's scope chain, this would make
* fp->script()->compartment() != fp->compartment().
*/
return call.callee().principals(cx);
}
} /* namespace js */
#if JS_HAS_OBJ_WATCHPOINT
static JSBool
obj_watch_handler(JSContext *cx, JSObject *obj, jsid id, jsval old,
jsval *nvp, void *closure)
{
JSObject *callable = (JSObject *) closure;
if (JSSubsumePrincipalsOp subsume = cx->runtime->securityCallbacks->subsumePrincipals) {
if (JSPrincipals *watcher = callable->principals(cx)) {
if (JSObject *scopeChain = cx->stack.currentScriptedScopeChain()) {
if (JSPrincipals *subject = scopeChain->principals(cx)) {
if (!subsume(watcher, subject)) {
/* Silently don't call the watch handler. */
return true;
}
}
}
}
}
/* Avoid recursion on (obj, id) already being watched on cx. */
AutoResolving resolving(cx, obj, id, AutoResolving::WATCH);
if (resolving.alreadyStarted())
return true;
Value argv[] = { IdToValue(id), old, *nvp };
return Invoke(cx, ObjectValue(*obj), ObjectOrNullValue(callable), ArrayLength(argv), argv, nvp);
}
static JSBool
obj_watch(JSContext *cx, unsigned argc, Value *vp)
{
if (argc <= 1) {
js_ReportMissingArg(cx, *vp, 1);
return false;
}
JSObject *callable = js_ValueToCallableObject(cx, &vp[3], 0);
if (!callable)
return false;
jsid propid;
if (!ValueToId(cx, vp[2], &propid))
return false;
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return false;
Value tmp;
unsigned attrs;
if (!CheckAccess(cx, obj, propid, JSACC_WATCH, &tmp, &attrs))
return false;
vp->setUndefined();
if (obj->isDenseArray() && !obj->makeDenseArraySlow(cx))
return false;
return JS_SetWatchPoint(cx, obj, propid, obj_watch_handler, callable);
}
static JSBool
obj_unwatch(JSContext *cx, unsigned argc, Value *vp)
{
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return false;
vp->setUndefined();
jsid id;
if (argc != 0) {
if (!ValueToId(cx, vp[2], &id))
return 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, unsigned argc, Value *vp)
{
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return false;
return js_HasOwnPropertyHelper(cx, obj->getOps()->lookupGeneric, argc, vp);
}
JSBool
js_HasOwnPropertyHelper(JSContext *cx, LookupGenericOp lookup, unsigned argc,
Value *vp)
{
jsid id;
if (!ValueToId(cx, argc != 0 ? vp[2] : UndefinedValue(), &id))
return JS_FALSE;
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return false;
JSObject *obj2;
JSProperty *prop;
if (obj->isProxy()) {
bool has;
if (!Proxy::hasOwn(cx, obj, id, &has))
return false;
vp->setBoolean(has);
return true;
}
if (!js_HasOwnProperty(cx, lookup, obj, id, &obj2, &prop))
return JS_FALSE;
vp->setBoolean(!!prop);
return JS_TRUE;
}
JSBool
js_HasOwnProperty(JSContext *cx, LookupGenericOp 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;
JSObject *outer = NULL;
if (JSObjectOp op = (*objp)->getClass()->ext.outerObject) {
outer = op(cx, *objp);
if (!outer)
return false;
}
if (outer != *objp)
*propp = NULL;
return true;
}
/* ES5 15.2.4.6. */
static JSBool
obj_isPrototypeOf(JSContext *cx, unsigned argc, Value *vp)
{
/* Step 1. */
if (argc < 1 || !vp[2].isObject()) {
vp->setBoolean(false);
return true;
}
/* Step 2. */
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return false;
/* Step 3. */
vp->setBoolean(js_IsDelegate(cx, obj, vp[2]));
return true;
}
/* ES5 15.2.4.7. */
static JSBool
obj_propertyIsEnumerable(JSContext *cx, unsigned argc, Value *vp)
{
/* Step 1. */
jsid id;
if (!ValueToId(cx, argc != 0 ? vp[2] : UndefinedValue(), &id))
return false;
/* Step 2. */
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return false;
/* Steps 3-5. */
return js_PropertyIsEnumerable(cx, obj, id, vp);
}
JSBool
js_PropertyIsEnumerable(JSContext *cx, JSObject *obj, jsid id, Value *vp)
{
JSObject *pobj;
JSProperty *prop;
if (!obj->lookupGeneric(cx, id, &pobj, &prop))
return false;
if (!prop) {
vp->setBoolean(false);
return true;
}
/*
* ECMA spec botch: return false unless hasOwnProperty. Leaving "own" out
* of propertyIsEnumerable's name was a mistake.
*/
if (pobj != obj) {
vp->setBoolean(false);
return true;
}
unsigned attrs;
if (!pobj->getGenericAttributes(cx, id, &attrs))
return false;
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__";
enum DefineType { Getter, Setter };
template<DefineType Type>
static bool
DefineAccessor(JSContext *cx, unsigned argc, Value *vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
if (!BoxNonStrictThis(cx, args))
return false;
if (args.length() < 2 || !js_IsCallable(args[1])) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_BAD_GETTER_OR_SETTER,
Type == Getter ? js_getter_str : js_setter_str);
return false;
}
jsid id;
if (!ValueToId(cx, args[0], &id))
return false;
JSObject *descObj = NewBuiltinClassInstance(cx, &ObjectClass);
if (!descObj)
return false;
JSAtomState &state = cx->runtime->atomState;
/* enumerable: true */
if (!descObj->defineProperty(cx, state.enumerableAtom, BooleanValue(true)))
return false;
/* configurable: true */
if (!descObj->defineProperty(cx, state.configurableAtom, BooleanValue(true)))
return false;
/* enumerable: true */
PropertyName *acc = (Type == Getter) ? state.getAtom : state.setAtom;
if (!descObj->defineProperty(cx, acc, args[1]))
return false;
JSBool dummy;
if (!js_DefineOwnProperty(cx, &args.thisv().toObject(), id, ObjectValue(*descObj), &dummy))
return false;
args.rval().setUndefined();
return true;
}
JS_FRIEND_API(JSBool)
js::obj_defineGetter(JSContext *cx, unsigned argc, Value *vp)
{
return DefineAccessor<Getter>(cx, argc, vp);
}
JS_FRIEND_API(JSBool)
js::obj_defineSetter(JSContext *cx, unsigned argc, Value *vp)
{
return DefineAccessor<Setter>(cx, argc, vp);
}
static JSBool
obj_lookupGetter(JSContext *cx, unsigned argc, Value *vp)
{
jsid id;
if (!ValueToId(cx, argc != 0 ? vp[2] : UndefinedValue(), &id))
return JS_FALSE;
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return JS_FALSE;
JSObject *pobj;
JSProperty *prop;
if (!obj->lookupGeneric(cx, id, &pobj, &prop))
return JS_FALSE;
vp->setUndefined();
if (prop) {
if (pobj->isNative()) {
Shape *shape = (Shape *) prop;
if (shape->hasGetterValue())
*vp = shape->getterValue();
}
}
return JS_TRUE;
}
static JSBool
obj_lookupSetter(JSContext *cx, unsigned argc, Value *vp)
{
jsid id;
if (!ValueToId(cx, argc != 0 ? vp[2] : UndefinedValue(), &id))
return JS_FALSE;
JSObject *obj = ToObject(cx, &vp[1]);
if (!obj)
return JS_FALSE;
JSObject *pobj;
JSProperty *prop;
if (!obj->lookupGeneric(cx, id, &pobj, &prop))
return JS_FALSE;
vp->setUndefined();
if (prop) {
if (pobj->isNative()) {
Shape *shape = (Shape *) prop;
if (shape->hasSetterValue())
*vp = shape->setterValue();
}
}
return JS_TRUE;
}
#endif /* OLD_GETTER_SETTER_METHODS */
JSBool
obj_getPrototypeOf(JSContext *cx, unsigned 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();
unsigned attrs;
return CheckAccess(cx, obj, ATOM_TO_JSID(cx->runtime->atomState.protoAtom),
JSACC_PROTO, vp, &attrs);
}
namespace js {
bool
NewPropertyDescriptorObject(JSContext *cx, const PropertyDescriptor *desc, Value *vp)
{
if (!desc->obj) {
vp->setUndefined();
return true;
}
/* We have our own property, so start creating the descriptor. */
PropDesc d;
d.initFromPropertyDescriptor(*desc);
if (!d.makeObject(cx))
return false;
*vp = d.pd;
return true;
}
void
PropDesc::initFromPropertyDescriptor(const PropertyDescriptor &desc)
{
pd.setUndefined();
attrs = uint8_t(desc.attrs);
JS_ASSERT_IF(attrs & JSPROP_READONLY, !(attrs & (JSPROP_GETTER | JSPROP_SETTER)));
if (desc.attrs & (JSPROP_GETTER | JSPROP_SETTER)) {
hasGet = true;
get = ((desc.attrs & JSPROP_GETTER) && desc.getter)
? CastAsObjectJsval(desc.getter)
: UndefinedValue();
hasSet = true;
set = ((desc.attrs & JSPROP_SETTER) && desc.setter)
? CastAsObjectJsval(desc.setter)
: UndefinedValue();
hasValue = false;
value.setUndefined();
hasWritable = false;
} else {
hasGet = false;
get.setUndefined();
hasSet = false;
set.setUndefined();
hasValue = true;
value = desc.value;
hasWritable = true;
}
hasEnumerable = true;
hasConfigurable = true;
}
bool
PropDesc::makeObject(JSContext *cx)
{
JSObject *obj = NewBuiltinClassInstance(cx, &ObjectClass);
if (!obj)
return false;
const JSAtomState &atomState = cx->runtime->atomState;
if ((hasConfigurable &&
!obj->defineProperty(cx, atomState.configurableAtom,
BooleanValue((attrs & JSPROP_PERMANENT) == 0))) ||
(hasEnumerable &&
!obj->defineProperty(cx, atomState.enumerableAtom,
BooleanValue((attrs & JSPROP_ENUMERATE) != 0))) ||
(hasGet &&
!obj->defineProperty(cx, atomState.getAtom, get)) ||
(hasSet &&
!obj->defineProperty(cx, atomState.setAtom, set)) ||
(hasValue &&
!obj->defineProperty(cx, atomState.valueAtom, value)) ||
(hasWritable &&
!obj->defineProperty(cx, atomState.writableAtom,
BooleanValue((attrs & JSPROP_READONLY) == 0))))
{
return false;
}
pd.setObject(*obj);
return true;
}
bool
GetOwnPropertyDescriptor(JSContext *cx, JSObject *obj, jsid id, PropertyDescriptor *desc)
{
if (obj->isProxy())
return Proxy::getOwnPropertyDescriptor(cx, obj, id, false, desc);
JSObject *pobj;
JSProperty *prop;
if (!js_HasOwnProperty(cx, obj->getOps()->lookupGeneric, obj, id, &pobj, &prop))
return false;
if (!prop) {
desc->obj = NULL;
return true;
}
bool doGet = true;
if (pobj->isNative()) {
Shape *shape = (Shape *) prop;
desc->attrs = shape->attributes();
if (desc->attrs & (JSPROP_GETTER | JSPROP_SETTER)) {
doGet = false;
if (desc->attrs & JSPROP_GETTER)
desc->getter = CastAsPropertyOp(shape->getterObject());
if (desc->attrs & JSPROP_SETTER)
desc->setter = CastAsStrictPropertyOp(shape->setterObject());
}
} else {
if (!pobj->getGenericAttributes(cx, id, &desc->attrs))
return false;
}
if (doGet && !obj->getGeneric(cx, id, &desc->value))
return false;
desc->obj = obj;
return true;
}
bool
GetOwnPropertyDescriptor(JSContext *cx, JSObject *obj, jsid id, Value *vp)
{
AutoPropertyDescriptorRooter desc(cx);
return GetOwnPropertyDescriptor(cx, obj, id, &desc) &&
NewPropertyDescriptorObject(cx, &desc, vp);
}
}
static bool
GetFirstArgumentAsObject(JSContext *cx, unsigned argc, Value *vp, const char *method, JSObject **objp)
{
if (argc == 0) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_MORE_ARGS_NEEDED,
method, "0", "s");
return false;
}
const Value &v = vp[2];
if (!v.isObject()) {
char *bytes = DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, v, NULL);
if (!bytes)
return false;
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_UNEXPECTED_TYPE,
bytes, "not an object");
JS_free(cx, bytes);
return false;
}
*objp = &v.toObject();
return true;
}
static JSBool
obj_getOwnPropertyDescriptor(JSContext *cx, unsigned 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 GetOwnPropertyDescriptor(cx, obj, nameidr.id(), vp);
}
static JSBool
obj_keys(JSContext *cx, unsigned argc, Value *vp)
{
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.keys", &obj))
return false;
AutoIdVector props(cx);
if (!GetPropertyNames(cx, obj, JSITER_OWNONLY, &props))
return false;
AutoValueVector vals(cx);
if (!vals.reserve(props.length()))
return false;
for (size_t i = 0, len = props.length(); i < len; i++) {
jsid id = props[i];
if (JSID_IS_STRING(id)) {
vals.infallibleAppend(StringValue(JSID_TO_STRING(id)));
} else if (JSID_IS_INT(id)) {
JSString *str = js_IntToString(cx, JSID_TO_INT(id));
if (!str)
return false;
vals.infallibleAppend(StringValue(str));
} else {
JS_ASSERT(JSID_IS_OBJECT(id));
}
}
JS_ASSERT(props.length() <= UINT32_MAX);
JSObject *aobj = NewDenseCopiedArray(cx, uint32_t(vals.length()), vals.begin());
if (!aobj)
return false;
vp->setObject(*aobj);
return true;
}
static bool
HasProperty(JSContext *cx, JSObject *obj, jsid id, Value *vp, bool *foundp)
{
if (!obj->hasProperty(cx, id, foundp, JSRESOLVE_QUALIFIED | JSRESOLVE_DETECTING))
return false;
if (!*foundp) {
vp->setUndefined();
return true;
}
/*
* We must go through the method read barrier in case id is 'get' or 'set'.
* There is no obvious way to defer cloning a joined function object whose
* identity will be used by DefinePropertyOnObject, e.g., or reflected via
* js::GetOwnPropertyDescriptor, as the getter or setter callable object.
*/
return !!obj->getGeneric(cx, id, vp);
}
PropDesc::PropDesc()
: pd(UndefinedValue()),
value(UndefinedValue()),
get(UndefinedValue()),
set(UndefinedValue()),
attrs(0),
hasGet(false),
hasSet(false),
hasValue(false),
hasWritable(false),
hasEnumerable(false),
hasConfigurable(false)
{
}
bool
PropDesc::initialize(JSContext *cx, const Value &origval, bool checkAccessors)
{
Value v = origval;
/* 8.10.5 step 1 */
if (v.isPrimitive()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_NOT_NONNULL_OBJECT);
return false;
}
JSObject *desc = &v.toObject();
/* Make a copy of the descriptor. We might need it later. */
pd = v;
/* Start with the proper defaults. */
attrs = JSPROP_PERMANENT | JSPROP_READONLY;
bool found;
/* 8.10.5 step 3 */
#ifdef __GNUC__ /* quell GCC overwarning */
found = false;
#endif
if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.enumerableAtom), &v, &found))
return false;
if (found) {
hasEnumerable = JS_TRUE;
if (js_ValueToBoolean(v))
attrs |= JSPROP_ENUMERATE;
}
/* 8.10.5 step 4 */
if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.configurableAtom), &v, &found))
return false;
if (found) {
hasConfigurable = JS_TRUE;
if (js_ValueToBoolean(v))
attrs &= ~JSPROP_PERMANENT;
}
/* 8.10.5 step 5 */
if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.valueAtom), &v, &found))
return false;
if (found) {
hasValue = true;
value = v;
}
/* 8.10.6 step 6 */
if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.writableAtom), &v, &found))
return false;
if (found) {
hasWritable = JS_TRUE;
if (js_ValueToBoolean(v))
attrs &= ~JSPROP_READONLY;
}
/* 8.10.7 step 7 */
if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.getAtom), &v, &found))
return false;
if (found) {
hasGet = true;
get = v;
attrs |= JSPROP_GETTER | JSPROP_SHARED;
attrs &= ~JSPROP_READONLY;
if (checkAccessors && !checkGetter(cx))
return false;
}
/* 8.10.7 step 8 */
if (!HasProperty(cx, desc, ATOM_TO_JSID(cx->runtime->atomState.setAtom), &v, &found))
return false;
if (found) {
hasSet = true;
set = v;
attrs |= JSPROP_SETTER | JSPROP_SHARED;
attrs &= ~JSPROP_READONLY;
if (checkAccessors && !checkSetter(cx))
return false;
}
/* 8.10.7 step 9 */
if ((hasGet || hasSet) && (hasValue || hasWritable)) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_INVALID_DESCRIPTOR);
return false;
}
JS_ASSERT_IF(attrs & JSPROP_READONLY, !(attrs & (JSPROP_GETTER | JSPROP_SETTER)));
return true;
}
static JSBool
Reject(JSContext *cx, unsigned errorNumber, bool throwError, jsid id, bool *rval)
{
if (throwError) {
jsid idstr;
if (!js_ValueToStringId(cx, IdToValue(id), &idstr))
return JS_FALSE;
JSAutoByteString bytes(cx, JSID_TO_STRING(idstr));
if (!bytes)
return JS_FALSE;
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, errorNumber, bytes.ptr());
return JS_FALSE;
}
*rval = false;
return JS_TRUE;
}
static JSBool
Reject(JSContext *cx, JSObject *obj, unsigned errorNumber, bool throwError, bool *rval)
{
if (throwError) {
if (js_ErrorFormatString[errorNumber].argCount == 1) {
js_ReportValueErrorFlags(cx, JSREPORT_ERROR, errorNumber,
JSDVG_IGNORE_STACK, ObjectValue(*obj),
NULL, NULL, NULL);
} else {
JS_ASSERT(js_ErrorFormatString[errorNumber].argCount == 0);
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, errorNumber);
}
return JS_FALSE;
}
*rval = false;
return JS_TRUE;
}
static JSBool
DefinePropertyOnObject(JSContext *cx, JSObject *obj, const jsid &id, const PropDesc &desc,
bool throwError, bool *rval)
{
/* 8.12.9 step 1. */
JSProperty *current;
JSObject *obj2;
JS_ASSERT(!obj->getOps()->lookupGeneric);
if (!js_HasOwnProperty(cx, NULL, obj, id, &obj2, ¤t))
return JS_FALSE;
JS_ASSERT(!obj->getOps()->defineProperty);
/* 8.12.9 steps 2-4. */
if (!current) {
if (!obj->isExtensible())
return Reject(cx, obj, JSMSG_OBJECT_NOT_EXTENSIBLE, throwError, rval);
*rval = true;
if (desc.isGenericDescriptor() || desc.isDataDescriptor()) {
JS_ASSERT(!obj->getOps()->defineProperty);
return js_DefineProperty(cx, obj, id, &desc.value,
JS_PropertyStub, JS_StrictPropertyStub, desc.attrs);
}
JS_ASSERT(desc.isAccessorDescriptor());
/*
* Getters and setters are just like watchpoints from an access
* control point of view.
*/
Value dummy;
unsigned dummyAttrs;
if (!CheckAccess(cx, obj, id, JSACC_WATCH, &dummy, &dummyAttrs))
return JS_FALSE;
Value tmp = UndefinedValue();
return js_DefineProperty(cx, obj, id, &tmp,
desc.getter(), desc.setter(), desc.attrs);
}
/* 8.12.9 steps 5-6 (note 5 is merely a special case of 6). */
Value v = UndefinedValue();
JS_ASSERT(obj == obj2);
const Shape *shape = reinterpret_cast<Shape *>(current);
do {
if (desc.isAccessorDescriptor()) {
if (!shape->isAccessorDescriptor())
break;
if (desc.hasGet) {
bool same;
if (!SameValue(cx, desc.getterValue(), shape->getterOrUndefined(), &same))
return false;
if (!same)
break;
}
if (desc.hasSet) {
bool same;
if (!SameValue(cx, desc.setterValue(), shape->setterOrUndefined(), &same))
return false;
if (!same)
break;
}
} else {
/*
* Determine the current value of the property once, if the current
* value might actually need to be used or preserved later. NB: we
* guard on whether the current property is a data descriptor to
* avoid calling a getter; we won't need the value if it's not a
* data descriptor.
*/
if (shape->isDataDescriptor()) {
/*
* We must rule out a non-configurable js::PropertyOp-guarded
* property becoming a writable unguarded data property, since
* such a property can have its value changed to one the getter
* and setter preclude.
*
* A desc lacking writable but with value is a data descriptor
* and we must reject it as if it had writable: true if current
* is writable.
*/
if (!shape->configurable() &&
(!shape->hasDefaultGetter() || !shape->hasDefaultSetter()) &&
desc.isDataDescriptor() &&
(desc.hasWritable ? desc.writable() : shape->writable()))
{
return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, id, rval);
}
if (!js_NativeGet(cx, obj, obj2, shape, JSGET_NO_METHOD_BARRIER, &v))
return JS_FALSE;
}
if (desc.isDataDescriptor()) {
if (!shape->isDataDescriptor())
break;
bool same;
if (desc.hasValue) {
if (!SameValue(cx, desc.value, v, &same))
return false;
if (!same) {
/*
* Insist that a non-configurable js::PropertyOp data
* property is frozen at exactly the last-got value.
*
* Duplicate the first part of the big conjunction that
* we tested above, rather than add a local bool flag.
* Likewise, don't try to keep shape->writable() in a
* flag we veto from true to false for non-configurable
* PropertyOp-based data properties and test before the
* SameValue check later on in order to re-use that "if
* (!SameValue) Reject" logic.
*
* This function is large and complex enough that it
* seems best to repeat a small bit of code and return
* Reject(...) ASAP, instead of being clever.
*/
if (!shape->configurable() &&
(!shape->hasDefaultGetter() || !shape->hasDefaultSetter()))
{
return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, id, rval);
}
break;
}
}
if (desc.hasWritable && desc.writable() != shape->writable())
break;
} else {
/* The only fields in desc will be handled below. */
JS_ASSERT(desc.isGenericDescriptor());
}
}
if (desc.hasConfigurable && desc.configurable() != shape->configurable())
break;
if (desc.hasEnumerable && desc.enumerable() != shape->enumerable())
break;
/* The conditions imposed by step 5 or step 6 apply. */
*rval = true;
return JS_TRUE;
} while (0);
/* 8.12.9 step 7. */
if (!shape->configurable()) {
/*
* Since [[Configurable]] defaults to false, we don't need to check
* whether it was specified. We can't do likewise for [[Enumerable]]
* because its putative value is used in a comparison -- a comparison
* whose result must always be false per spec if the [[Enumerable]]
* field is not present. Perfectly pellucid logic, eh?
*/
JS_ASSERT_IF(!desc.hasConfigurable, !desc.configurable());
if (desc.configurable() ||
(desc.hasEnumerable && desc.enumerable() != shape->enumerable())) {
return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, id, rval);
}
}
bool callDelProperty = false;
if (desc.isGenericDescriptor()) {
/* 8.12.9 step 8, no validation required */
} else if (desc.isDataDescriptor() != shape->isDataDescriptor()) {
/* 8.12.9 step 9. */
if (!shape->configurable())
return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, id, rval);
} else if (desc.isDataDescriptor()) {
/* 8.12.9 step 10. */
JS_ASSERT(shape->isDataDescriptor());
if (!shape->configurable() && !shape->writable()) {
if (desc.hasWritable && desc.writable())
return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, id, rval);
if (desc.hasValue) {
bool same;
if (!SameValue(cx, desc.value, v, &same))
return false;
if (!same)
return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, id, rval);
}
}
callDelProperty = !shape->hasDefaultGetter() || !shape->hasDefaultSetter();
} else {
/* 8.12.9 step 11. */
JS_ASSERT(desc.isAccessorDescriptor() && shape->isAccessorDescriptor());
if (!shape->configurable()) {
if (desc.hasSet) {
bool same;
if (!SameValue(cx, desc.setterValue(), shape->setterOrUndefined(), &same))
return false;
if (!same)
return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, id, rval);
}
if (desc.hasGet) {
bool same;
if (!SameValue(cx, desc.getterValue(), shape->getterOrUndefined(), &same))
return false;
if (!same)
return Reject(cx, JSMSG_CANT_REDEFINE_PROP, throwError, id, rval);
}
}
}
/* 8.12.9 step 12. */
unsigned attrs;
PropertyOp getter;
StrictPropertyOp setter;
if (desc.isGenericDescriptor()) {
unsigned changed = 0;
if (desc.hasConfigurable)
changed |= JSPROP_PERMANENT;
if (desc.hasEnumerable)
changed |= JSPROP_ENUMERATE;
attrs = (shape->attributes() & ~changed) | (desc.attrs & changed);
if (shape->isMethod()) {
JS_ASSERT(!(attrs & (JSPROP_GETTER | JSPROP_SETTER)));
getter = JS_PropertyStub;
setter = JS_StrictPropertyStub;
} else {
getter = shape->getter();
setter = shape->setter();
}
} else if (desc.isDataDescriptor()) {
unsigned unchanged = 0;
if (!desc.hasConfigurable)
unchanged |= JSPROP_PERMANENT;
if (!desc.hasEnumerable)
unchanged |= JSPROP_ENUMERATE;
/* Watch out for accessor -> data transformations here. */
if (!desc.hasWritable && shape->isDataDescriptor())
unchanged |= JSPROP_READONLY;
if (desc.hasValue)
v = desc.value;
attrs = (desc.attrs & ~unchanged) | (shape->attributes() & unchanged);
getter = JS_PropertyStub;
setter = JS_StrictPropertyStub;
} else {
JS_ASSERT(desc.isAccessorDescriptor());
/*
* Getters and setters are just like watchpoints from an access
* control point of view.
*/
Value dummy;
if (!CheckAccess(cx, obj2, id, JSACC_WATCH, &dummy, &attrs))
return JS_FALSE;
JS_ASSERT_IF(shape->isMethod(), !(attrs & (JSPROP_GETTER | JSPROP_SETTER)));
/* 8.12.9 step 12. */
unsigned changed = 0;
if (desc.hasConfigurable)
changed |= JSPROP_PERMANENT;
if (desc.hasEnumerable)
changed |= JSPROP_ENUMERATE;
if (desc.hasGet)
changed |= JSPROP_GETTER | JSPROP_SHARED | JSPROP_READONLY;
if (desc.hasSet)
changed |= JSPROP_SETTER | JSPROP_SHARED | JSPROP_READONLY;
attrs = (desc.attrs & changed) | (shape->attributes() & ~changed);
if (desc.hasGet) {
getter = desc.getter();
} else {
getter = (shape->isMethod() || (shape->hasDefaultGetter() && !shape->hasGetterValue()))
? JS_PropertyStub
: shape->getter();
}
if (desc.hasSet) {
setter = desc.setter();
} else {
setter = (shape->hasDefaultSetter() && !shape->hasSetterValue())
? JS_StrictPropertyStub
: shape->setter();
}
}
*rval = true;
/*
* Since "data" properties implemented using native C functions may rely on
* side effects during setting, we must make them aware that they have been
* "assigned"; deleting the property before redefining it does the trick.
* See bug 539766, where we ran into problems when we redefined
* arguments.length without making the property aware that its value had
* been changed (which would have happened if we had deleted it before
* redefining it or we had invoked its setter to change its value).
*/
if (callDelProperty) {
Value dummy = UndefinedValue();
if (!CallJSPropertyOp(cx, obj2->getClass()->delProperty, obj2, id, &dummy))
return false;
}
return js_DefineProperty(cx, obj, id, &v, getter, setter, attrs);
}
static JSBool
DefinePropertyOnArray(JSContext *cx, JSObject *obj, const jsid &id, const PropDesc &desc,
bool throwError, bool *rval)
{
/*
* We probably should optimize dense array property definitions where
* the descriptor describes a traditional array property (enumerable,
* configurable, writable, numeric index or length without altering its
* attributes). Such definitions are probably unlikely, so we don't bother
* for now.
*/
if (obj->isDenseArray() && !obj->makeDenseArraySlow(cx))
return JS_FALSE;
uint32_t oldLen = obj->getArrayLength();
if (JSID_IS_ATOM(id, cx->runtime->atomState.lengthAtom)) {
/*
* Our optimization of storage of the length property of arrays makes
* it very difficult to properly implement defining the property. For
* now simply throw an exception (NB: not merely Reject) on any attempt
* to define the "length" property, rather than attempting to implement
* some difficult-for-authors-to-grasp subset of that functionality.
*/
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CANT_DEFINE_ARRAY_LENGTH);
return JS_FALSE;
}
uint32_t index;
if (js_IdIsIndex(id, &index)) {
/*
// Disabled until we support defining "length":
if (index >= oldLen && lengthPropertyNotWritable())
return ThrowTypeError(cx, JSMSG_CANT_APPEND_TO_ARRAY);
*/
if (!DefinePropertyOnObject(cx, obj, id, desc, false, rval))
return JS_FALSE;
if (!*rval)
return Reject(cx, obj, JSMSG_CANT_DEFINE_ARRAY_INDEX, throwError, rval);
if (index >= oldLen) {
JS_ASSERT(index != UINT32_MAX);
obj->setArrayLength(cx, index + 1);
}
*rval = true;
return JS_TRUE;
}
return DefinePropertyOnObject(cx, obj, id, desc, throwError, rval);
}
namespace js {
bool
DefineProperty(JSContext *cx, JSObject *obj, const jsid &id, const PropDesc &desc, bool throwError,
bool *rval)
{
if (obj->isArray())
return DefinePropertyOnArray(cx, obj, id, desc, throwError, rval);
if (obj->getOps()->lookupGeneric) {
if (obj->isProxy())
return Proxy::defineProperty(cx, obj, id, desc.pd);
return Reject(cx, obj, JSMSG_OBJECT_NOT_EXTENSIBLE, throwError, rval);
}
return DefinePropertyOnObject(cx, obj, id, desc, throwError, rval);
}
} /* namespace js */
JSBool
js_DefineOwnProperty(JSContext *cx, JSObject *obj, jsid id, const Value &descriptor, JSBool *bp)
{
AutoPropDescArrayRooter descs(cx);
PropDesc *desc = descs.append();
if (!desc || !desc->initialize(cx, descriptor))
return false;
bool rval;
if (!DefineProperty(cx, obj, id, *desc, true, &rval))
return false;
*bp = !!rval;
return true;
}
/* ES5 15.2.3.6: Object.defineProperty(O, P, Attributes) */
static JSBool
obj_defineProperty(JSContext *cx, unsigned argc, Value *vp)
{
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.defineProperty", &obj))
return false;
jsid id;
if (!ValueToId(cx, argc >= 2 ? vp[3] : UndefinedValue(), &id))
return JS_FALSE;
const Value descval = argc >= 3 ? vp[4] : UndefinedValue();
JSBool junk;
if (!js_DefineOwnProperty(cx, obj, id, descval, &junk))
return false;
vp->setObject(*obj);
return true;
}
namespace js {
bool
ReadPropertyDescriptors(JSContext *cx, JSObject *props, bool checkAccessors,
AutoIdVector *ids, AutoPropDescArrayRooter *descs)
{
if (!GetPropertyNames(cx, props, JSITER_OWNONLY, ids))
return false;
for (size_t i = 0, len = ids->length(); i < len; i++) {
jsid id = (*ids)[i];
PropDesc* desc = descs->append();
Value v;
if (!desc || !props->getGeneric(cx, id, &v) || !desc->initialize(cx, v, checkAccessors))
return false;
}
return true;
}
} /* namespace js */
static bool
DefineProperties(JSContext *cx, JSObject *obj, JSObject *props)
{
AutoIdVector ids(cx);
AutoPropDescArrayRooter descs(cx);
if (!ReadPropertyDescriptors(cx, props, true, &ids, &descs))
return false;
bool dummy;
for (size_t i = 0, len = ids.length(); i < len; i++) {
if (!DefineProperty(cx, obj, ids[i], descs[i], true, &dummy))
return false;
}
return true;
}
extern JSBool
js_PopulateObject(JSContext *cx, JSObject *newborn, JSObject *props)
{
return DefineProperties(cx, newborn, props);
}
/* ES5 15.2.3.7: Object.defineProperties(O, Properties) */
static JSBool
obj_defineProperties(JSContext *cx, unsigned argc, Value *vp)
{
/* Steps 1 and 7. */
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.defineProperties", &obj))
return false;
vp->setObject(*obj);
/* Step 2. */
if (argc < 2) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_MORE_ARGS_NEEDED,
"Object.defineProperties", "0", "s");
return false;
}
JSObject *props = ToObject(cx, &vp[3]);
if (!props)
return false;
/* Steps 3-6. */
return DefineProperties(cx, obj, props);
}
/* ES5 15.2.3.5: Object.create(O [, Properties]) */
static JSBool
obj_create(JSContext *cx, unsigned argc, Value *vp)
{
if (argc == 0) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_MORE_ARGS_NEEDED,
"Object.create", "0", "s");
return false;
}
CallArgs args = CallArgsFromVp(argc, vp);
const Value &v = args[0];
if (!v.isObjectOrNull()) {
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 or null");
JS_free(cx, bytes);
return false;
}
JSObject *proto = v.toObjectOrNull();
if (proto && proto->isXML()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_XML_PROTO_FORBIDDEN);
return 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 = NewObjectWithGivenProto(cx, &ObjectClass, proto, &args.callee().global());
if (!obj)
return false;
/* Don't track types or array-ness for objects created here. */
MarkTypeObjectUnknownProperties(cx, obj->type());
/* 15.2.3.5 step 4. */
if (args.hasDefined(1)) {
if (args[1].isPrimitive()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_NOT_NONNULL_OBJECT);
return false;
}
if (!DefineProperties(cx, obj, &args[1].toObject()))
return false;
}
/* 5. Return obj. */
args.rval().setObject(*obj);
return true;
}
static JSBool
obj_getOwnPropertyNames(JSContext *cx, unsigned 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_IntToString(cx, JSID_TO_INT(id));
if (!str)
return false;
vals[i].setString(str);
} else if (JSID_IS_ATOM(id)) {
vals[i].setString(JSID_TO_STRING(id));
} else {
vals[i].setObject(*JSID_TO_OBJECT(id));
}
}
JSObject *aobj = NewDenseCopiedArray(cx, vals.length(), vals.begin());
if (!aobj)
return false;
vp->setObject(*aobj);
return true;
}
static JSBool
obj_isExtensible(JSContext *cx, unsigned argc, Value *vp)
{
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.isExtensible", &obj))
return false;
vp->setBoolean(obj->isExtensible());
return true;
}
static JSBool
obj_preventExtensions(JSContext *cx, unsigned argc, Value *vp)
{
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.preventExtensions", &obj))
return false;
vp->setObject(*obj);
if (!obj->isExtensible())
return true;
AutoIdVector props(cx);
return obj->preventExtensions(cx, &props);
}
/* static */ inline unsigned
JSObject::getSealedOrFrozenAttributes(unsigned attrs, ImmutabilityType it)
{
/* Make all attributes permanent; if freezing, make data attributes read-only. */
if (it == FREEZE && !(attrs & (JSPROP_GETTER | JSPROP_SETTER)))
return JSPROP_PERMANENT | JSPROP_READONLY;
return JSPROP_PERMANENT;
}
bool
JSObject::sealOrFreeze(JSContext *cx, ImmutabilityType it)
{
assertSameCompartment(cx, this);
JS_ASSERT(it == SEAL || it == FREEZE);
RootedVarObject self(cx, this);
AutoIdVector props(cx);
if (isExtensible()) {
if (!preventExtensions(cx, &props))
return false;
} else {
if (!GetPropertyNames(cx, this, JSITER_HIDDEN | JSITER_OWNONLY, &props))
return false;
}
/* preventExtensions must slowify dense arrays, so we can assign to holes without checks. */
JS_ASSERT(!self->isDenseArray());
if (isNative() && !inDictionaryMode()) {
/*
* Seal/freeze non-dictionary objects by constructing a new shape
* hierarchy mirroring the original one, which can be shared if many
* objects with the same structure are sealed/frozen. If we use the
* generic path below then any non-empty object will be converted to
* dictionary mode.
*/
Shape *last = EmptyShape::getInitialShape(cx, self->getClass(),
self->getProto(),
self->getParent(),
self->getAllocKind(),
self->lastProperty()->getObjectFlags());
if (!last)
return false;
/* Get an in order list of the shapes in this object. */
AutoShapeVector shapes(cx);
for (Shape::Range r = self->lastProperty()->all(); !r.empty(); r.popFront()) {
if (!shapes.append(&r.front()))
return false;
}
Reverse(shapes.begin(), shapes.end());
for (size_t i = 0; i < shapes.length(); i++) {
StackShape child(shapes[i]);
child.attrs |= getSealedOrFrozenAttributes(child.attrs, it);
if (!JSID_IS_EMPTY(child.propid))
MarkTypePropertyConfigured(cx, self, child.propid);
last = JS_PROPERTY_TREE(cx).getChild(cx, last, self->numFixedSlots(), child);
if (!last)
return NULL;
}
JS_ASSERT(self->lastProperty()->slotSpan() == last->slotSpan());
JS_ALWAYS_TRUE(setLastProperty(cx, last));
} else {
for (size_t i = 0; i < props.length(); i++) {
jsid id = props[i];
unsigned attrs;
if (!self->getGenericAttributes(cx, id, &attrs))
return false;
unsigned new_attrs = getSealedOrFrozenAttributes(attrs, it);
/* If we already have the attributes we need, skip the setAttributes call. */
if ((attrs | new_attrs) == attrs)
continue;
attrs |= new_attrs;
if (!self->setGenericAttributes(cx, id, &attrs))
return false;
}
}
return true;
}
bool
JSObject::isSealedOrFrozen(JSContext *cx, ImmutabilityType it, bool *resultp)
{
if (isExtensible()) {
*resultp = false;
return true;
}
AutoIdVector props(cx);
if (!GetPropertyNames(cx, this, JSITER_HIDDEN | JSITER_OWNONLY, &props))
return false;
for (size_t i = 0, len = props.length(); i < len; i++) {
jsid id = props[i];
unsigned attrs;
if (!getGenericAttributes(cx, id, &attrs))
return false;
/*
* If the property is configurable, this object is neither sealed nor
* frozen. If the property is a writable data property, this object is
* not frozen.
*/
if (!(attrs & JSPROP_PERMANENT) ||
(it == FREEZE && !(attrs & (JSPROP_READONLY | JSPROP_GETTER | JSPROP_SETTER))))
{
*resultp = false;
return true;
}
}
/* All properties checked out. This object is sealed/frozen. */
*resultp = true;
return true;
}
static JSBool
obj_freeze(JSContext *cx, unsigned argc, Value *vp)
{
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.freeze", &obj))
return false;
vp->setObject(*obj);
return obj->freeze(cx);
}
static JSBool
obj_isFrozen(JSContext *cx, unsigned argc, Value *vp)
{
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.preventExtensions", &obj))
return false;
bool frozen;
if (!obj->isFrozen(cx, &frozen))
return false;
vp->setBoolean(frozen);
return true;
}
static JSBool
obj_seal(JSContext *cx, unsigned argc, Value *vp)
{
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.seal", &obj))
return false;
vp->setObject(*obj);
return obj->seal(cx);
}
static JSBool
obj_isSealed(JSContext *cx, unsigned argc, Value *vp)
{
JSObject *obj;
if (!GetFirstArgumentAsObject(cx, argc, vp, "Object.isSealed", &obj))
return false;
bool sealed;
if (!obj->isSealed(cx, &sealed))
return false;
vp->setBoolean(sealed);
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";
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
};
JSFunctionSpec object_static_methods[] = {
JS_FN("getPrototypeOf", obj_getPrototypeOf, 1,0),
JS_FN("getOwnPropertyDescriptor", obj_getOwnPropertyDescriptor,2,0),
JS_FN("keys", obj_keys, 1,0),
JS_FN("defineProperty", obj_defineProperty, 3,0),
JS_FN("defineProperties", obj_defineProperties, 2,0),
JS_FN("create", obj_create, 2,0),
JS_FN("getOwnPropertyNames", obj_getOwnPropertyNames, 1,0),
JS_FN("isExtensible", obj_isExtensible, 1,0),
JS_FN("preventExtensions", obj_preventExtensions, 1,0),
JS_FN("freeze", obj_freeze, 1,0),
JS_FN("isFrozen", obj_isFrozen, 1,0),
JS_FN("seal", obj_seal, 1,0),
JS_FN("isSealed", obj_isSealed, 1,0),
JS_FS_END
};
JSBool
js_Object(JSContext *cx, unsigned argc, Value *vp)
{
JSObject *obj;
if (argc == 0) {
/* Trigger logic below to construct a blank object. */
obj = NULL;
} else {
/* If argv[0] is null or undefined, obj comes back null. */
if (!js_ValueToObjectOrNull(cx, vp[2], &obj))
return JS_FALSE;
}
if (!obj) {
/* Make an object whether this was called with 'new' or not. */
JS_ASSERT(!argc || vp[2].isNull() || vp[2].isUndefined());
gc::AllocKind kind = NewObjectGCKind(cx, &ObjectClass);
obj = NewBuiltinClassInstance(cx, &ObjectClass, kind);
if (!obj)
return JS_FALSE;
TypeObject *type = GetTypeCallerInitObject(cx, JSProto_Object);
if (!type)
return JS_FALSE;
obj->setType(type);
}
vp->setObject(*obj);
return JS_TRUE;
}
static inline JSObject *
NewObject(JSContext *cx, Class *clasp, types::TypeObject *type, JSObject *parent,
gc::AllocKind kind)
{
JS_ASSERT(clasp != &ArrayClass);
JS_ASSERT_IF(clasp == &FunctionClass,
kind == JSFunction::FinalizeKind || kind == JSFunction::ExtendedFinalizeKind);
RootTypeObject typeRoot(cx, &type);
RootedVarShape shape(cx);
shape = EmptyShape::getInitialShape(cx, clasp, type->proto, parent, kind);
if (!shape)
return NULL;
HeapSlot *slots;
if (!PreallocateObjectDynamicSlots(cx, shape, &slots))
return NULL;
JSObject *obj = JSObject::create(cx, kind, shape, typeRoot, slots);
if (!obj)
return NULL;
/*
* This will cancel an already-running incremental GC from doing any more
* slices, and it will prevent any future incremental GCs.
*/
if (clasp->trace && !(clasp->flags & JSCLASS_IMPLEMENTS_BARRIERS))
cx->runtime->gcIncrementalEnabled = false;
Probes::createObject(cx, obj);
return obj;
}
JSObject *
js::NewObjectWithGivenProto(JSContext *cx, js::Class *clasp, JSObject *proto, JSObject *parent,
gc::AllocKind kind)
{
if (CanBeFinalizedInBackground(kind, clasp))
kind = GetBackgroundAllocKind(kind);
NewObjectCache &cache = cx->compartment->newObjectCache;
NewObjectCache::EntryIndex entry = -1;
if (proto && (!parent || parent == proto->getParent()) && !proto->isGlobal()) {
if (cache.lookupProto(clasp, proto, kind, &entry))
return cache.newObjectFromHit(cx, entry);
}
RootObject protoRoot(cx, &proto);
RootObject parentRoot(cx, &parent);
types::TypeObject *type = proto ? proto->getNewType(cx) : cx->compartment->getEmptyType(cx);
if (!type)
return NULL;
/*
* Default parent to the parent of the prototype, which was set from
* the parent of the prototype's constructor.
*/
if (!parent && proto)
parent = proto->getParent();
JSObject *obj = NewObject(cx, clasp, type, parent, kind);
if (!obj)
return NULL;
if (entry != -1 && !obj->hasDynamicSlots())
cache.fillProto(entry, clasp, proto, kind, obj);
return obj;
}
JSObject *
js::NewObjectWithClassProto(JSContext *cx, js::Class *clasp, JSObject *proto, JSObject *parent,
gc::AllocKind kind)
{
if (proto)
return NewObjectWithGivenProto(cx, clasp, proto, parent, kind);
if (CanBeFinalizedInBackground(kind, clasp))
kind = GetBackgroundAllocKind(kind);
if (!parent)
parent = GetCurrentGlobal(cx);
/*
* Use the object cache, except for classes without a cached proto key.
* On these objects, FindProto will do a dynamic property lookup to get
* global[className].prototype, where changes to either the className or
* prototype property would render the cached lookup incorrect. For classes
* with a proto key, the prototype created during class initialization is
* stored in an immutable slot on the global (except for ClearScope, which
* will flush the new object cache).
*/
JSProtoKey protoKey = GetClassProtoKey(clasp);
NewObjectCache &cache = cx->compartment->newObjectCache;
NewObjectCache::EntryIndex entry = -1;
if (parent->isGlobal() && protoKey != JSProto_Null) {
if (cache.lookupGlobal(clasp, &parent->asGlobal(), kind, &entry))
return cache.newObjectFromHit(cx, entry);
}
RootObject parentRoot(cx, &parent);
if (!FindProto(cx, clasp, parentRoot, &proto))
return NULL;
types::TypeObject *type = proto->getNewType(cx);
if (!type)
return NULL;
JSObject *obj = NewObject(cx, clasp, type, parent, kind);
if (!obj)
return NULL;
if (entry != -1 && !obj->hasDynamicSlots())
cache.fillGlobal(entry, clasp, &parent->asGlobal(), kind, obj);
return obj;
}
JSObject *
js::NewObjectWithType(JSContext *cx, types::TypeObject *type, JSObject *parent, gc::AllocKind kind)
{
JS_ASSERT(type->proto->hasNewType(type));
JS_ASSERT(parent);
if (CanBeFinalizedInBackground(kind, &ObjectClass))
kind = GetBackgroundAllocKind(kind);
NewObjectCache &cache = cx->compartment->newObjectCache;
NewObjectCache::EntryIndex entry = -1;
if (parent == type->proto->getParent()) {
if (cache.lookupType(&ObjectClass, type, kind, &entry))
return cache.newObjectFromHit(cx, entry);
}
JSObject *obj = NewObject(cx, &ObjectClass, type, parent, kind);
if (!obj)
return NULL;
if (entry != -1 && !obj->hasDynamicSlots())
cache.fillType(entry, &ObjectClass, type, kind, obj);
return obj;
}
JSObject *
js::NewReshapedObject(JSContext *cx, TypeObject *type, JSObject *parent,
gc::AllocKind kind, const Shape *shape)
{
JSObject *res = NewObjectWithType(cx, type, parent, kind);
if (!res)
return NULL;
if (shape->isEmptyShape())
return res;
/* Get all the ids in the object, in order. */
js::AutoIdVector ids(cx);
for (unsigned i = 0; i <= shape->slot(); i++) {
if (!ids.append(JSID_VOID))
return NULL;
}
const js::Shape *nshape = shape;
while (!nshape->isEmptyShape()) {
ids[nshape->slot()] = nshape->propid();
nshape = nshape->previous();
}
/* Construct the new shape. */
for (unsigned i = 0; i < ids.length(); i++) {
if (!DefineNativeProperty(cx, res, ids[i], js::UndefinedValue(), NULL, NULL,
JSPROP_ENUMERATE, 0, 0, DNP_SKIP_TYPE)) {
return NULL;
}
}
JS_ASSERT(!res->inDictionaryMode());
return res;
}
JSObject*
js_CreateThis(JSContext *cx, JSObject *callee)
{
Class *clasp = callee->getClass();
Class *newclasp = &ObjectClass;
if (clasp == &FunctionClass) {
JSFunction *fun = callee->toFunction();
if (fun->isNative() && fun->u.n.clasp)
newclasp = fun->u.n.clasp;
}
Value protov;
if (!callee->getProperty(cx, cx->runtime->atomState.classPrototypeAtom, &protov))
return NULL;
JSObject *proto = protov.isObjectOrNull() ? protov.toObjectOrNull() : NULL;
JSObject *parent = callee->getParent();
gc::AllocKind kind = NewObjectGCKind(cx, newclasp);
return NewObjectWithClassProto(cx, newclasp, proto, parent, kind);
}
static inline JSObject *
CreateThisForFunctionWithType(JSContext *cx, types::TypeObject *type, JSObject *parent)
{
if (type->newScript) {
/*
* Make an object with the type's associated finalize kind and shape,
* which reflects any properties that will definitely be added to the
* object before it is read from.
*/
gc::AllocKind kind = type->newScript->allocKind;
JSObject *res = NewObjectWithType(cx, type, parent, kind);
if (res)
JS_ALWAYS_TRUE(res->setLastProperty(cx, (Shape *) type->newScript->shape.get()));
return res;
}
gc::AllocKind kind = NewObjectGCKind(cx, &ObjectClass);
return NewObjectWithType(cx, type, parent, kind);
}
JSObject *
js_CreateThisForFunctionWithProto(JSContext *cx, JSObject *callee, JSObject *proto)
{
JSObject *res;
if (proto) {
types::TypeObject *type = proto->getNewType(cx, callee->toFunction());
if (!type)
return NULL;
res = CreateThisForFunctionWithType(cx, type, callee->getParent());
} else {
gc::AllocKind kind = NewObjectGCKind(cx, &ObjectClass);
res = NewObjectWithClassProto(cx, &ObjectClass, proto, callee->getParent(), kind);
}
if (res && cx->typeInferenceEnabled())
TypeScript::SetThis(cx, callee->toFunction()->script(), types::Type::ObjectType(res));
return res;
}
JSObject *
js_CreateThisForFunction(JSContext *cx, JSObject *callee, bool newType)
{
Value protov;
if (!callee->getProperty(cx, cx->runtime->atomState.classPrototypeAtom, &protov))
return NULL;
JSObject *proto;
if (protov.isObject())
proto = &protov.toObject();
else
proto = NULL;
JSObject *obj = js_CreateThisForFunctionWithProto(cx, callee, proto);
if (obj && newType) {
/*
* Reshape the object and give it a (lazily instantiated) singleton
* type before passing it as the 'this' value for the call.
*/
obj->clear(cx);
if (!obj->setSingletonType(cx))
return NULL;
JSScript *calleeScript = callee->toFunction()->script();
TypeScript::SetThis(cx, calleeScript, types::Type::ObjectType(obj));
}
return obj;
}
/*
* Given pc pointing after a property accessing bytecode, return true if the
* access is "object-detecting" in the sense used by web scripts, e.g., when
* checking whether document.all is defined.
*/
static bool
Detecting(JSContext *cx, jsbytecode *pc)
{
/* General case: a branch or equality op follows the access. */
JSOp op = JSOp(*pc);
if (js_CodeSpec[op].format & JOF_DETECTING)
return true;
JSAtom *atom;
JSScript *script = cx->stack.currentScript();
jsbytecode *endpc = script->code + script->length;
JS_ASSERT(script->code <= pc && pc < endpc);
if (op == 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 = JSOp(*pc);
return op == JSOP_EQ || op == JSOP_NE;
}
return false;
}
if (op == JSOP_GETGNAME || op == JSOP_NAME) {
/*
* Special case #2: handle (document.all == undefined). Don't worry
* about a local variable named |undefined| shadowing the immutable
* global binding...because, really?
*/
atom = script->getAtom(GET_UINT32_INDEX(pc));
if (atom == cx->runtime->atomState.typeAtoms[JSTYPE_VOID] &&
(pc += js_CodeSpec[op].length) < endpc) {
op = JSOp(*pc);
return op == JSOP_EQ || op == JSOP_NE || op == JSOP_STRICTEQ || op == JSOP_STRICTNE;
}
}
return false;
}
/*
* 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.
*/
unsigned
js_InferFlags(JSContext *cx, unsigned defaultFlags)
{
const JSCodeSpec *cs;
uint32_t format;
unsigned flags = 0;
jsbytecode *pc;
JSScript *script = cx->stack.currentScript(&pc);
if (!script || !pc)
return defaultFlags;
cs = &js_CodeSpec[*pc];
format = cs->format;
if (JOF_MODE(format) != JOF_NAME)
flags |= JSRESOLVE_QUALIFIED;
if (format & JOF_SET) {
flags |= JSRESOLVE_ASSIGNING;
} else if (cs->length >= 0) {
pc += cs->length;
if (pc < script->code + script->length && Detecting(cx, pc))
flags |= JSRESOLVE_DETECTING;
}
if (format & JOF_DECLARING)
flags |= JSRESOLVE_DECLARING;
return flags;
}
JSBool
JSObject::nonNativeSetProperty(JSContext *cx, jsid id, js::Value *vp, JSBool strict)
{
if (JS_UNLIKELY(watched())) {
id = js_CheckForStringIndex(id);
WatchpointMap *wpmap = cx->compartment->watchpointMap;
if (wpmap && !wpmap->triggerWatchpoint(cx, this, id, vp))
return false;
}
return getOps()->setGeneric(cx, this, id, vp, strict);
}
JSBool
JSObject::nonNativeSetElement(JSContext *cx, uint32_t index, js::Value *vp, JSBool strict)
{
if (JS_UNLIKELY(watched())) {
jsid id;
if (!IndexToId(cx, index, &id))
return false;
JS_ASSERT(id == js_CheckForStringIndex(id));
WatchpointMap *wpmap = cx->compartment->watchpointMap;
if (wpmap && !wpmap->triggerWatchpoint(cx, this, id, vp))
return false;
}
return getOps()->setElement(cx, this, index, vp, strict);
}
bool
JSObject::deleteByValue(JSContext *cx, const Value &property, Value *rval, bool strict)
{
uint32_t index;
if (IsDefinitelyIndex(property, &index))
return deleteElement(cx, index, rval, strict);
Value propval = property;
SpecialId sid;
if (ValueIsSpecial(this, &propval, &sid, cx))
return deleteSpecial(cx, sid, rval, strict);
JSAtom *name;
if (!js_ValueToAtom(cx, propval, &name))
return false;
if (name->isIndex(&index))
return deleteElement(cx, index, rval, false);
return deleteProperty(cx, name->asPropertyName(), rval, false);
}
JS_FRIEND_API(bool)
JS_CopyPropertiesFrom(JSContext *cx, JSObject *target, JSObject *obj)
{
// If we're not native, then we cannot copy properties.
JS_ASSERT(target->isNative() == obj->isNative());
if (!target->isNative())
return true;
AutoShapeVector shapes(cx);
for (Shape::Range r(obj->lastProperty()); !r.empty(); r.popFront()) {
if (!shapes.append(&r.front()))
return false;
}
size_t n = shapes.length();
while (n > 0) {
const Shape *shape = shapes[--n];
unsigned attrs = shape->attributes();
PropertyOp getter = shape->getter();
if ((attrs & JSPROP_GETTER) && !cx->compartment->wrap(cx, &getter))
return false;
StrictPropertyOp setter = shape->setter();
if ((attrs & JSPROP_SETTER) && !cx->compartment->wrap(cx, &setter))
return false;
Value v = shape->hasSlot() ? obj->getSlot(shape->slot()) : UndefinedValue();
if (!cx->compartment->wrap(cx, &v))
return false;
if (!target->defineGeneric(cx, shape->propid(), v, getter, setter, attrs))
return false;
}
return true;
}
static bool
CopySlots(JSContext *cx, JSObject *from, JSObject *to)
{
JS_ASSERT(!from->isNative() && !to->isNative());
JS_ASSERT(from->getClass() == to->getClass());
size_t n = 0;
if (from->isWrapper() &&
(Wrapper::wrapperHandler(from)->flags() & Wrapper::CROSS_COMPARTMENT)) {
to->setSlot(0, from->getSlot(0));
to->setSlot(1, from->getSlot(1));
n = 2;
}
size_t span = JSCLASS_RESERVED_SLOTS(from->getClass());
for (; n < span; ++n) {
Value v = from->getSlot(n);
if (!cx->compartment->wrap(cx, &v))
return false;
to->setSlot(n, v);
}
return true;
}
JS_FRIEND_API(JSObject *)
JS_CloneObject(JSContext *cx, JSObject *obj, JSObject *proto, JSObject *parent)
{
/*
* We can only clone native objects and proxies. Dense arrays are slowified if
* we try to clone them.
*/
if (!obj->isNative()) {
if (obj->isDenseArray()) {
if (!obj->makeDenseArraySlow(cx))
return NULL;
} else if (!obj->isProxy()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_CANT_CLONE_OBJECT);
return NULL;
}
}
JSObject *clone = NewObjectWithGivenProto(cx, obj->getClass(), proto, parent, obj->getAllocKind());
if (!clone)
return NULL;
if (obj->isNative()) {
if (clone->isFunction() && (obj->compartment() != clone->compartment())) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_CANT_CLONE_OBJECT);
return NULL;
}
if (obj->hasPrivate())
clone->setPrivate(obj->getPrivate());
} else {
JS_ASSERT(obj->isProxy());
if (!CopySlots(cx, obj, clone))
return NULL;
}
return clone;
}
struct JSObject::TradeGutsReserved {
JSContext *cx;
Vector<Value> avals;
Vector<Value> bvals;
int newafixed;
int newbfixed;
Shape *newashape;
Shape *newbshape;
HeapSlot *newaslots;
HeapSlot *newbslots;
TradeGutsReserved(JSContext *cx)
: cx(cx), avals(cx), bvals(cx),
newafixed(0), newbfixed(0),
newashape(NULL), newbshape(NULL),
newaslots(NULL), newbslots(NULL)
{}
~TradeGutsReserved()
{
if (newaslots)
cx->free_(newaslots);
if (newbslots)
cx->free_(newbslots);
}
};
bool
JSObject::ReserveForTradeGuts(JSContext *cx, JSObject *a, JSObject *b,
TradeGutsReserved &reserved)
{
/*
* When performing multiple swaps between objects which may have different
* numbers of fixed slots, we reserve all space ahead of time so that the
* swaps can be performed infallibly.
*/
if (a->sizeOfThis() == b->sizeOfThis())
return true;
/*
* If either object is native, it needs a new shape to preserve the
* invariant that objects with the same shape have the same number of
* inline slots. The fixed slots will be updated in place during TradeGuts.
* Non-native objects need to be reshaped according to the new count.
*/
if (a->isNative()) {
if (!a->generateOwnShape(cx))
return false;
} else {
reserved.newbshape = EmptyShape::getInitialShape(cx, a->getClass(),
a->getProto(), a->getParent(),
b->getAllocKind());
if (!reserved.newbshape)
return false;
}
if (b->isNative()) {
if (!b->generateOwnShape(cx))
return false;
} else {
reserved.newashape = EmptyShape::getInitialShape(cx, b->getClass(),
b->getProto(), b->getParent(),
a->getAllocKind());
if (!reserved.newashape)
return false;
}
/* The avals/bvals vectors hold all original values from the objects. */
if (!reserved.avals.reserve(a->slotSpan()))
return false;
if (!reserved.bvals.reserve(b->slotSpan()))
return false;
JS_ASSERT(a->elements == emptyObjectElements);
JS_ASSERT(b->elements == emptyObjectElements);
/*
* The newafixed/newbfixed hold the number of fixed slots in the objects
* after the swap. Adjust these counts according to whether the objects
* use their last fixed slot for storing private data.
*/
reserved.newafixed = a->numFixedSlots();
reserved.newbfixed = b->numFixedSlots();
if (a->hasPrivate()) {
reserved.newafixed++;
reserved.newbfixed--;
}
if (b->hasPrivate()) {
reserved.newbfixed++;
reserved.newafixed--;
}
JS_ASSERT(reserved.newafixed >= 0);
JS_ASSERT(reserved.newbfixed >= 0);
/*
* The newaslots/newbslots arrays hold any dynamic slots for the objects
* if they do not have enough fixed slots to accomodate the slots in the
* other object.
*/
unsigned adynamic = dynamicSlotsCount(reserved.newafixed, b->slotSpan());
unsigned bdynamic = dynamicSlotsCount(reserved.newbfixed, a->slotSpan());
if (adynamic) {
reserved.newaslots = (HeapSlot *) cx->malloc_(sizeof(HeapSlot) * adynamic);
if (!reserved.newaslots)
return false;
Debug_SetSlotRangeToCrashOnTouch(reserved.newaslots, adynamic);
}
if (bdynamic) {
reserved.newbslots = (HeapSlot *) cx->malloc_(sizeof(HeapSlot) * bdynamic);
if (!reserved.newbslots)
return false;
Debug_SetSlotRangeToCrashOnTouch(reserved.newbslots, bdynamic);
}
return true;
}
void
JSObject::TradeGuts(JSContext *cx, JSObject *a, JSObject *b, TradeGutsReserved &reserved)
{
JS_ASSERT(a->compartment() == b->compartment());
JS_ASSERT(a->isFunction() == b->isFunction());
/* Don't try to swap a JSFunction for a plain function JSObject. */
JS_ASSERT_IF(a->isFunction(), a->sizeOfThis() == b->sizeOfThis());
/*
* Regexp guts are more complicated -- we would need to migrate the
* refcounted JIT code blob for them across compartments instead of just
* swapping guts.
*/
JS_ASSERT(!a->isRegExp() && !b->isRegExp());
/*
* Callers should not try to swap dense arrays or ArrayBuffer objects,
* these use a different slot representation from other objects.
*/
JS_ASSERT(!a->isDenseArray() && !b->isDenseArray());
JS_ASSERT(!a->isArrayBuffer() && !b->isArrayBuffer());
#ifdef JSGC_INCREMENTAL
/*
* We need a write barrier here. If |a| was marked and |b| was not, then
* after the swap, |b|'s guts would never be marked. The write barrier
* solves this.
*/
JSCompartment *comp = a->compartment();
if (comp->needsBarrier()) {
MarkChildren(comp->barrierTracer(), a);
MarkChildren(comp->barrierTracer(), b);
}
#endif
/* Trade the guts of the objects. */
const size_t size = a->sizeOfThis();
if (size == b->sizeOfThis()) {
/*
* If the objects are the same size, then we make no assumptions about
* whether they have dynamically allocated slots and instead just copy
* them over wholesale.
*/
char tmp[tl::Max<sizeof(JSFunction), sizeof(JSObject_Slots16)>::result];
JS_ASSERT(size <= sizeof(tmp));
js_memcpy(tmp, a, size);
js_memcpy(a, b, size);
js_memcpy(b, tmp, size);
#ifdef JSGC_GENERATIONAL
/*
* Trigger post barriers for fixed slots. JSObject bits are barriered
* below, in common with the other case.
*/
JSCompartment *comp = cx->compartment;
for (size_t i = 0; i < a->numFixedSlots(); ++i) {
HeapSlot::writeBarrierPost(comp, a, i);
HeapSlot::writeBarrierPost(comp, b, i);
}
#endif
} else {
/*
* If the objects are of differing sizes, use the space we reserved
* earlier to save the slots from each object and then copy them into
* the new layout for the other object.
*/
unsigned acap = a->slotSpan();
unsigned bcap = b->slotSpan();
for (size_t i = 0; i < acap; i++)
reserved.avals.infallibleAppend(a->getSlot(i));
for (size_t i = 0; i < bcap; i++)
reserved.bvals.infallibleAppend(b->getSlot(i));
/* Done with the dynamic slots. */
if (a->hasDynamicSlots())
cx->free_(a->slots);
if (b->hasDynamicSlots())
cx->free_(b->slots);
void *apriv = a->hasPrivate() ? a->getPrivate() : NULL;
void *bpriv = b->hasPrivate() ? b->getPrivate() : NULL;
char tmp[sizeof(JSObject)];
js_memcpy(&tmp, a, sizeof tmp);
js_memcpy(a, b, sizeof tmp);
js_memcpy(b, &tmp, sizeof tmp);
if (a->isNative())
a->shape_->setNumFixedSlots(reserved.newafixed);
else
a->shape_ = reserved.newashape;
a->slots = reserved.newaslots;
a->initSlotRange(0, reserved.bvals.begin(), bcap);
if (a->hasPrivate())
a->initPrivate(bpriv);
if (b->isNative())
b->shape_->setNumFixedSlots(reserved.newbfixed);
else
b->shape_ = reserved.newbshape;
b->slots = reserved.newbslots;
b->initSlotRange(0, reserved.avals.begin(), acap);
if (b->hasPrivate())
b->initPrivate(apriv);
/* Make sure the destructor for reserved doesn't free the slots. */
reserved.newaslots = NULL;
reserved.newbslots = NULL;
}
#ifdef JSGC_GENERATIONAL
Shape::writeBarrierPost(a->shape_, &a->shape_);
Shape::writeBarrierPost(b->shape_, &b->shape_);
types::TypeObject::writeBarrierPost(a->type_, &a->type_);
types::TypeObject::writeBarrierPost(b->type_, &b->type_);
#endif
if (a->inDictionaryMode())
a->lastProperty()->listp = &a->shape_;
if (b->inDictionaryMode())
b->lastProperty()->listp = &b->shape_;
}
/*
* Use this method with extreme caution. It trades the guts of two objects and updates
* scope ownership. This operation is not thread-safe, just as fast array to slow array
* transitions are inherently not thread-safe. Don't perform a swap operation on objects
* shared across threads or, or bad things will happen. You have been warned.
*/
bool
JSObject::swap(JSContext *cx, JSObject *other)
{
if (this->compartment() == other->compartment()) {
TradeGutsReserved reserved(cx);
if (!ReserveForTradeGuts(cx, this, other, reserved))
return false;
TradeGuts(cx, this, other, reserved);
return true;
}
JSObject *thisClone;
JSObject *otherClone;
{
AutoCompartment ac(cx, other);
if (!ac.enter())
return false;
thisClone = JS_CloneObject(cx, this, other->getProto(), other->getParent());
if (!thisClone || !JS_CopyPropertiesFrom(cx, thisClone, this))
return false;
}
{
AutoCompartment ac(cx, this);
if (!ac.enter())
return false;
otherClone = JS_CloneObject(cx, other, other->getProto(), other->getParent());
if (!otherClone || !JS_CopyPropertiesFrom(cx, otherClone, other))
return false;
}
TradeGutsReserved reservedThis(cx);
TradeGutsReserved reservedOther(cx);
if (!ReserveForTradeGuts(cx, this, otherClone, reservedThis) ||
!ReserveForTradeGuts(cx, other, thisClone, reservedOther)) {
return false;
}
TradeGuts(cx, this, otherClone, reservedThis);
TradeGuts(cx, other, thisClone, reservedOther);
return true;
}
static bool
DefineStandardSlot(JSContext *cx, JSObject *obj, JSProtoKey key, JSAtom *atom,
const Value &v, uint32_t attrs, bool &named)
{
jsid id = ATOM_TO_JSID(atom);
if (key != JSProto_Null) {
/*
* Initializing an actual standard class on a global object. If the
* property is not yet present, force it into a new one bound to a
* reserved slot. Otherwise, go through the normal property path.
*/
JS_ASSERT(obj->isGlobal());
JS_ASSERT(obj->isNative());
const Shape *shape = obj->nativeLookup(cx, id);
if (!shape) {
uint32_t slot = 2 * JSProto_LIMIT + key;
obj->setReservedSlot(slot, v);
if (!obj->addProperty(cx, id, JS_PropertyStub, JS_StrictPropertyStub, slot, attrs, 0, 0))
return false;
AddTypePropertyId(cx, obj, id, v);
named = true;
return true;
}
}
named = obj->defineGeneric(cx, id, v, JS_PropertyStub, JS_StrictPropertyStub, attrs);
return named;
}
namespace js {
static void
SetClassObject(JSObject *obj, JSProtoKey key, JSObject *cobj, JSObject *proto)
{
JS_ASSERT(!obj->getParent());
if (!obj->isGlobal())
return;
obj->setReservedSlot(key, ObjectOrNullValue(cobj));
obj->setReservedSlot(JSProto_LIMIT + key, ObjectOrNullValue(proto));
}
static void
ClearClassObject(JSContext *cx, JSObject *obj, JSProtoKey key)
{
JS_ASSERT(!obj->getParent());
if (!obj->isGlobal())
return;
obj->setSlot(key, UndefinedValue());
obj->setSlot(JSProto_LIMIT + key, UndefinedValue());
}
JSObject *
DefineConstructorAndPrototype(JSContext *cx, HandleObject obj, JSProtoKey key, HandleAtom atom,
JSObject *protoProto, Class *clasp,
Native constructor, unsigned nargs,
JSPropertySpec *ps, JSFunctionSpec *fs,
JSPropertySpec *static_ps, JSFunctionSpec *static_fs,
JSObject **ctorp, AllocKind ctorKind)
{
/*
* 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
* &FunctionClass, not a JSObject-sized (smaller) GC-thing.
*
* The JS_NewObjectForGivenProto and JS_NewObject APIs also allow clasp to
* be &FunctionClass (we could break compatibility easily). But fixing
* (3) is not enough without addressing the bootstrapping dependency on (1)
* and (2).
*/
/*
* Create the prototype object. (GlobalObject::createBlankPrototype isn't
* used because it parents the prototype object to the global and because
* it uses WithProto::Given. FIXME: Undo dependencies on this parentage
* [which already needs to happen for bug 638316], figure out nicer
* semantics for null-protoProto, and use createBlankPrototype.)
*/
RootedVarObject proto(cx);
proto = NewObjectWithClassProto(cx, clasp, protoProto, obj);
if (!proto)
return NULL;
if (!proto->setSingletonType(cx))
return NULL;
if (clasp == &ArrayClass && !proto->makeDenseArraySlow(cx))
return NULL;
/* After this point, control must exit via label bad or out. */
RootedVarObject ctor(cx);
bool named = false;
bool cached = false;
if (!constructor) {
/*
* Lacking a constructor, name the prototype (e.g., Math) unless this
* class (a) is anonymous, i.e. for internal use only; (b) the class
* of obj (the global object) is has a reserved slot indexed by key;
* and (c) key is not the null key.
*/
if (!(clasp->flags & JSCLASS_IS_ANONYMOUS) || !obj->isGlobal() || key == JSProto_Null) {
uint32_t 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 {
/*
* Create the constructor, not using GlobalObject::createConstructor
* because the constructor currently must have |obj| as its parent.
* (FIXME: remove this dependency on the exact identity of the parent,
* perhaps as part of bug 638316.)
*/
RootedVarFunction fun(cx);
fun = js_NewFunction(cx, NULL, constructor, nargs, JSFUN_CONSTRUCTOR, obj, atom,
ctorKind);
if (!fun)
goto bad;
fun->setConstructorClass(clasp);
/*
* Set the class object early for standard class constructors. Type
* inference may need to access these, and js_GetClassPrototype will
* fail if it tries to do a reentrant reconstruction of the class.
*/
if (key != JSProto_Null) {
SetClassObject(obj, key, fun, proto);
cached = true;
}
AutoValueRooter tvr2(cx, ObjectValue(*fun));
if (!DefineStandardSlot(cx, obj, key, atom, tvr2.value(), 0, named))
goto bad;
/*
* 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;
if (!LinkConstructorAndPrototype(cx, ctor, proto))
goto bad;
/* Bootstrap Function.prototype (see also JS_InitStandardClasses). */
if (ctor->getClass() == clasp && !ctor->splicePrototype(cx, proto))
goto bad;
}
if (!DefinePropertiesAndBrand(cx, proto, ps, fs) ||
(ctor != proto && !DefinePropertiesAndBrand(cx, ctor, static_ps, static_fs)))
{
goto bad;
}
if (clasp->flags & (JSCLASS_FREEZE_PROTO|JSCLASS_FREEZE_CTOR)) {
JS_ASSERT_IF(ctor == proto, !(clasp->flags & JSCLASS_FREEZE_CTOR));
if (proto && (clasp->flags & JSCLASS_FREEZE_PROTO) && !proto->freeze(cx))
goto bad;
if (ctor && (clasp->flags & JSCLASS_FREEZE_CTOR) && !ctor->freeze(cx))
goto bad;
}
/* If this is a standard class, cache its prototype. */
if (!cached && key != JSProto_Null)
SetClassObject(obj, key, ctor, proto);
if (ctorp)
*ctorp = ctor;
return proto;
bad:
if (named) {
Value rval;
obj->deleteByValue(cx, StringValue(atom), &rval, false);
}
if (cached)
ClearClassObject(cx, obj, key);
return NULL;
}
/*
* Lazy standard classes need a way to indicate if they have been initialized.
* Otherwise, when we delete them, we might accidentally recreate them via a
* lazy initialization. We use the presence of a ctor or proto in the
* globalObject's slot to indicate that they've been constructed, but this only
* works for classes which have a proto and ctor. Classes which don't have one
* can call MarkStandardClassInitializedNoProto(), and we can always check
* whether a class is initialized by calling IsStandardClassResolved().
*/
bool
IsStandardClassResolved(JSObject *obj, js::Class *clasp)
{
JSProtoKey key = JSCLASS_CACHED_PROTO_KEY(clasp);
/* If the constructor is undefined, then it hasn't been initialized. */
return (obj->getReservedSlot(key) != UndefinedValue());
}
void
MarkStandardClassInitializedNoProto(JSObject *obj, js::Class *clasp)
{
JSProtoKey key = JSCLASS_CACHED_PROTO_KEY(clasp);
/*
* We use True so that it's obvious what we're doing (instead of, say,
* Null, which might be miscontrued as an error in setting Undefined).
*/
if (obj->getReservedSlot(key) == UndefinedValue())
obj->setSlot(key, BooleanValue(true));
}
}
JSObject *
js_InitClass(JSContext *cx, HandleObject obj, JSObject *protoProto,
Class *clasp, Native constructor, unsigned nargs,
JSPropertySpec *ps, JSFunctionSpec *fs,
JSPropertySpec *static_ps, JSFunctionSpec *static_fs,
JSObject **ctorp, AllocKind ctorKind)
{
RootObject rootProto(cx, &protoProto);
RootedVarAtom atom(cx);
atom = js_Atomize(cx, clasp->name, strlen(clasp->name));
if (!atom)
return NULL;
/*
* All instances of the class will inherit properties from the prototype
* object we are about to create (in DefineConstructorAndPrototype), which
* in turn will inherit from protoProto.
*
* When initializing a standard class (other than Object), if protoProto is
* null, default to the Object prototype object. The engine's internal uses
* of js_InitClass depend on this nicety. Note that in
* js_InitFunctionAndObjectClasses, we specially hack the resolving table
* and then depend on js_GetClassPrototype here leaving protoProto NULL and
* returning true.
*/
JSProtoKey key = JSCLASS_CACHED_PROTO_KEY(clasp);
if (key != JSProto_Null &&
!protoProto &&
!js_GetClassPrototype(cx, obj, JSProto_Object, &protoProto)) {
return NULL;
}
return DefineConstructorAndPrototype(cx, obj, key, atom, protoProto, clasp, constructor, nargs,
ps, fs, static_ps, static_fs, ctorp, ctorKind);
}
void
JSObject::initSlotRange(size_t start, const Value *vector, size_t length)
{
JSCompartment *comp = compartment();
HeapSlot *fixedStart, *fixedEnd, *slotsStart, *slotsEnd;
getSlotRange(start, length, &fixedStart, &fixedEnd, &slotsStart, &slotsEnd);
for (HeapSlot *sp = fixedStart; sp != fixedEnd; sp++)
sp->init(comp, this, start++, *vector++);
for (HeapSlot *sp = slotsStart; sp != slotsEnd; sp++)
sp->init(comp, this, start++, *vector++);
}
void
JSObject::copySlotRange(size_t start, const Value *vector, size_t length)
{
JSCompartment *comp = compartment();
HeapSlot *fixedStart, *fixedEnd, *slotsStart, *slotsEnd;
getSlotRange(start, length, &fixedStart, &fixedEnd, &slotsStart, &slotsEnd);
for (HeapSlot *sp = fixedStart; sp != fixedEnd; sp++)
sp->set(comp, this, start++, *vector++);
for (HeapSlot *sp = slotsStart; sp != slotsEnd; sp++)
sp->set(comp, this, start++, *vector++);
}
inline void
JSObject::invalidateSlotRange(size_t start, size_t length)
{
#ifdef DEBUG
JS_ASSERT(!isDenseArray());
HeapSlot *fixedStart, *fixedEnd, *slotsStart, *slotsEnd;
getSlotRange(start, length, &fixedStart, &fixedEnd, &slotsStart, &slotsEnd);
Debug_SetSlotRangeToCrashOnTouch(fixedStart, fixedEnd);
Debug_SetSlotRangeToCrashOnTouch(slotsStart, slotsEnd);
#endif /* DEBUG */
}
inline bool
JSObject::updateSlotsForSpan(JSContext *cx, size_t oldSpan, size_t newSpan)
{
JS_ASSERT(oldSpan != newSpan);
size_t oldCount = dynamicSlotsCount(numFixedSlots(), oldSpan);
size_t newCount = dynamicSlotsCount(numFixedSlots(), newSpan);
if (oldSpan < newSpan) {
if (oldCount < newCount && !growSlots(cx, oldCount, newCount))
return false;
if (newSpan == oldSpan + 1)
initSlotUnchecked(oldSpan, UndefinedValue());
else
initializeSlotRange(oldSpan, newSpan - oldSpan);
} else {
/* Trigger write barriers on the old slots before reallocating. */
prepareSlotRangeForOverwrite(newSpan, oldSpan);
invalidateSlotRange(newSpan, oldSpan - newSpan);
if (oldCount > newCount)
shrinkSlots(cx, oldCount, newCount);
}
return true;
}
bool
JSObject::setLastProperty(JSContext *cx, const js::Shape *shape)
{
JS_ASSERT(!inDictionaryMode());
JS_ASSERT(!shape->inDictionary());
JS_ASSERT(shape->compartment() == compartment());
JS_ASSERT(shape->numFixedSlots() == numFixedSlots());
size_t oldSpan = lastProperty()->slotSpan();
size_t newSpan = shape->slotSpan();
if (oldSpan == newSpan) {
shape_ = const_cast<js::Shape *>(shape);
return true;
}
if (!updateSlotsForSpan(cx, oldSpan, newSpan))
return false;
shape_ = const_cast<js::Shape *>(shape);
return true;
}
bool
JSObject::setSlotSpan(JSContext *cx, uint32_t span)
{
JS_ASSERT(inDictionaryMode());
js::BaseShape *base = lastProperty()->base();
size_t oldSpan = base->slotSpan();
if (oldSpan == span)
return true;
if (!updateSlotsForSpan(cx, oldSpan, span))
return false;
base->setSlotSpan(span);
return true;
}
bool
JSObject::growSlots(JSContext *cx, uint32_t oldCount, uint32_t newCount)
{
JS_ASSERT(newCount > oldCount);
JS_ASSERT(newCount >= SLOT_CAPACITY_MIN);
JS_ASSERT(!isDenseArray());
/*
* Slots are only allocated for call objects when new properties are
* added to them, which can only happen while the call is still on the
* stack (and an eval, DEFFUN, etc. happens). We thus do not need to
* worry about updating any active outer function args/vars.
*/
JS_ASSERT_IF(isCall(), asCall().maybeStackFrame() != NULL);
/*
* Slot capacities are determined by the span of allocated objects. Due to
* the limited number of bits to store shape slots, object growth is
* throttled well before the slot capacity can overflow.
*/
JS_ASSERT(newCount < NELEMENTS_LIMIT);
size_t oldSize = Probes::objectResizeActive() ? computedSizeOfThisSlotsElements() : 0;
size_t newSize = oldSize + (newCount - oldCount) * sizeof(Value);
/*
* If we are allocating slots for an object whose type is always created
* by calling 'new' on a particular script, bump the GC kind for that
* type to give these objects a larger number of fixed slots when future
* objects are constructed.
*/
if (!hasLazyType() && !oldCount && type()->newScript) {
gc::AllocKind kind = type()->newScript->allocKind;
unsigned newScriptSlots = gc::GetGCKindSlots(kind);
if (newScriptSlots == numFixedSlots() && gc::TryIncrementAllocKind(&kind)) {
JSObject *obj = NewReshapedObject(cx, type(), getParent(), kind,
type()->newScript->shape);
if (!obj)
return false;
type()->newScript->allocKind = kind;
type()->newScript->shape = obj->lastProperty();
type()->markStateChange(cx);
}
}
if (!oldCount) {
slots = (HeapSlot *) cx->malloc_(newCount * sizeof(HeapSlot));
if (!slots)
return false;
Debug_SetSlotRangeToCrashOnTouch(slots, newCount);
if (Probes::objectResizeActive())
Probes::resizeObject(cx, this, oldSize, newSize);
return true;
}
HeapSlot *newslots = (HeapSlot*) cx->realloc_(slots, oldCount * sizeof(HeapSlot),
newCount * sizeof(HeapSlot));
if (!newslots)
return false; /* Leave slots at its old size. */
bool changed = slots != newslots;
slots = newslots;
Debug_SetSlotRangeToCrashOnTouch(slots + oldCount, newCount - oldCount);
/* Changes in the slots of global objects can trigger recompilation. */
if (changed && isGlobal())
types::MarkObjectStateChange(cx, this);
if (Probes::objectResizeActive())
Probes::resizeObject(cx, this, oldSize, newSize);
return true;
}
void
JSObject::shrinkSlots(JSContext *cx, uint32_t oldCount, uint32_t newCount)
{
JS_ASSERT(newCount < oldCount);
JS_ASSERT(!isDenseArray());
/*
* Refuse to shrink slots for call objects. This only happens in a very
* obscure situation (deleting names introduced by a direct 'eval') and
* allowing the slots pointer to change may require updating pointers in
* the function's active args/vars information.
*/
if (isCall())
return;
size_t oldSize = Probes::objectResizeActive() ? computedSizeOfThisSlotsElements() : 0;
size_t newSize = oldSize - (oldCount - newCount) * sizeof(Value);
if (newCount == 0) {
cx->free_(slots);
slots = NULL;
if (Probes::objectResizeActive())
Probes::resizeObject(cx, this, oldSize, newSize);
return;
}
JS_ASSERT(newCount >= SLOT_CAPACITY_MIN);
HeapSlot *newslots = (HeapSlot *) cx->realloc_(slots, newCount * sizeof(HeapSlot));
if (!newslots)
return; /* Leave slots at its old size. */
bool changed = slots != newslots;
slots = newslots;
/* Watch for changes in global object slots, as for growSlots. */
if (changed && isGlobal())
types::MarkObjectStateChange(cx, this);
if (Probes::objectResizeActive())
Probes::resizeObject(cx, this, oldSize, newSize);
}
bool
JSObject::growElements(JSContext *cx, unsigned newcap)
{
JS_ASSERT(isDenseArray());
/*
* When an object with CAPACITY_DOUBLING_MAX or fewer elements needs to
* grow, double its capacity, to add N elements in amortized O(N) time.
*
* Above this limit, grow by 12.5% each time. Speed is still amortized
* O(N), with a higher constant factor, and we waste less space.
*/
static const size_t CAPACITY_DOUBLING_MAX = 1024 * 1024;
static const size_t CAPACITY_CHUNK = CAPACITY_DOUBLING_MAX / sizeof(Value);
uint32_t oldcap = getDenseArrayCapacity();
JS_ASSERT(oldcap <= newcap);
size_t oldSize = Probes::objectResizeActive() ? computedSizeOfThisSlotsElements() : 0;
uint32_t nextsize = (oldcap <= CAPACITY_DOUBLING_MAX)
? oldcap * 2
: oldcap + (oldcap >> 3);
uint32_t actualCapacity = JS_MAX(newcap, nextsize);
if (actualCapacity >= CAPACITY_CHUNK)
actualCapacity = JS_ROUNDUP(actualCapacity, CAPACITY_CHUNK);
else if (actualCapacity < SLOT_CAPACITY_MIN)
actualCapacity = SLOT_CAPACITY_MIN;
/* Don't let nelements get close to wrapping around uint32_t. */
if (actualCapacity >= NELEMENTS_LIMIT || actualCapacity < oldcap || actualCapacity < newcap) {
JS_ReportOutOfMemory(cx);
return false;
}
uint32_t initlen = getDenseArrayInitializedLength();
uint32_t newAllocated = actualCapacity + ObjectElements::VALUES_PER_HEADER;
ObjectElements *newheader;
if (hasDynamicElements()) {
uint32_t oldAllocated = oldcap + ObjectElements::VALUES_PER_HEADER;
newheader = (ObjectElements *)
cx->realloc_(getElementsHeader(), oldAllocated * sizeof(Value),
newAllocated * sizeof(Value));
if (!newheader)
return false; /* Leave elements as its old size. */
} else {
newheader = (ObjectElements *) cx->malloc_(newAllocated * sizeof(Value));
if (!newheader)
return false; /* Ditto. */
js_memcpy(newheader, getElementsHeader(),
(ObjectElements::VALUES_PER_HEADER + initlen) * sizeof(Value));
}
newheader->capacity = actualCapacity;
elements = newheader->elements();
Debug_SetSlotRangeToCrashOnTouch(elements + initlen, actualCapacity - initlen);
if (Probes::objectResizeActive())
Probes::resizeObject(cx, this, oldSize, computedSizeOfThisSlotsElements());
return true;
}
void
JSObject::shrinkElements(JSContext *cx, unsigned newcap)
{
JS_ASSERT(isDenseArray());
uint32_t oldcap = getDenseArrayCapacity();
JS_ASSERT(newcap <= oldcap);
size_t oldSize = Probes::objectResizeActive() ? computedSizeOfThisSlotsElements() : 0;
/* Don't shrink elements below the minimum capacity. */
if (oldcap <= SLOT_CAPACITY_MIN || !hasDynamicElements())
return;
newcap = Max(newcap, SLOT_CAPACITY_MIN);
uint32_t newAllocated = newcap + ObjectElements::VALUES_PER_HEADER;
ObjectElements *newheader = (ObjectElements *)
cx->realloc_(getElementsHeader(), newAllocated * sizeof(Value));
if (!newheader)
return; /* Leave elements at its old size. */
newheader->capacity = newcap;
elements = newheader->elements();
if (Probes::objectResizeActive())
Probes::resizeObject(cx, this, oldSize, computedSizeOfThisSlotsElements());
}
#ifdef DEBUG
bool
JSObject::slotInRange(unsigned slot, SentinelAllowed sentinel) const
{
size_t capacity = numFixedSlots() + numDynamicSlots();
if (sentinel == SENTINEL_ALLOWED)
return slot <= capacity;
return slot < capacity;
}
#endif /* DEBUG */
static JSObject *
js_InitNullClass(JSContext *cx, JSObject *obj)
{
JS_ASSERT(0);
return NULL;
}
#define JS_PROTO(name,code,init) extern JSObject *init(JSContext *, JSObject *);
#include "jsproto.tbl"
#undef JS_PROTO
static JSObjectOp lazy_prototype_init[JSProto_LIMIT] = {
#define JS_PROTO(name,code,init) init,
#include "jsproto.tbl"
#undef JS_PROTO
};
namespace js {
bool
SetProto(JSContext *cx, JSObject *obj, JSObject *proto, bool checkForCycles)
{
JS_ASSERT_IF(!checkForCycles, obj != proto);
JS_ASSERT(obj->isExtensible());
if (proto && proto->isXML()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_XML_PROTO_FORBIDDEN);
return false;
}
/*
* Regenerate shapes for all of the scopes along the old prototype chain,
* in case any entries were filled by looking up through obj. Stop when a
* non-native object is found, prototype lookups will not be cached across
* these.
*
* How this shape change is done is very delicate; the change can be made
* either by marking the object's prototype as uncacheable (such that the
* property cache and JIT'ed ICs cannot assume the shape determines the
* prototype) or by just generating a new shape for the object. Choosing
* the former is bad if the object is on the prototype chain of other
* objects, as the uncacheable prototype can inhibit iterator caches on
* those objects and slow down prototype accesses. Choosing the latter is
* bad if there are many similar objects to this one which will have their
* prototype mutated, as the generateOwnShape forces the object into
* dictionary mode and similar property lineages will be repeatedly cloned.
*
* :XXX: bug 707717 make this code less brittle.
*/
JSObject *oldproto = obj;
while (oldproto && oldproto->isNative()) {
if (oldproto->hasSingletonType()) {
if (!oldproto->generateOwnShape(cx))
return false;
} else {
if (!oldproto->setUncacheableProto(cx))
return false;
}
oldproto = oldproto->getProto();
}
if (checkForCycles) {
for (JSObject *obj2 = proto; obj2; obj2 = obj2->getProto()) {
if (obj2 == obj) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CYCLIC_VALUE,
js_proto_str);
return false;
}
}
}
if (obj->hasSingletonType()) {
/*
* Just splice the prototype, but mark the properties as unknown for
* consistent behavior.
*/
if (!obj->splicePrototype(cx, proto))
return false;
MarkTypeObjectUnknownProperties(cx, obj->type());
return true;
}
if (proto && !proto->setNewTypeUnknown(cx))
return false;
TypeObject *type = proto
? proto->getNewType(cx, NULL)
: cx->compartment->getEmptyType(cx);
if (!type)
return false;
/*
* Setting __proto__ on an object that has escaped and may be referenced by
* other heap objects can only be done if the properties of both objects
* are unknown. Type sets containing this object will contain the original
* type but not the new type of the object, so we need to go and scan the
* entire compartment for type sets which have these objects and mark them
* as containing generic objects.
*/
MarkTypeObjectUnknownProperties(cx, obj->type(), true);
MarkTypeObjectUnknownProperties(cx, type, true);
obj->setType(type);
return true;
}
}
JSBool
js_GetClassObject(JSContext *cx, JSObject *obj, JSProtoKey key,
JSObject **objp)
{
RootObject objRoot(cx, &obj);
obj = &obj->global();
if (!obj->isGlobal()) {
*objp = NULL;
return true;
}
Value v = obj->getReservedSlot(key);
if (v.isObject()) {
*objp = &v.toObject();
return true;
}
AutoResolving resolving(cx, obj, ATOM_TO_JSID(cx->runtime->atomState.classAtoms[key]));
if (resolving.alreadyStarted()) {
/* Already caching id in obj -- suppress recursion. */
*objp = NULL;
return true;
}
JSObject *cobj = NULL;
if (JSObjectOp init = lazy_prototype_init[key]) {
if (!init(cx, obj))
return false;
v = obj->getReservedSlot(key);
if (v.isObject())
cobj = &v.toObject();
}
*objp = cobj;
return true;
}
JSBool
js_FindClassObject(JSContext *cx, JSObject *start, JSProtoKey protoKey,
Value *vp, Class *clasp)
{
JSObject *cobj, *pobj;
jsid id;
JSProperty *prop;
const Shape *shape;
RootedVarObject obj(cx);
if (start) {
obj = &start->global();
OBJ_TO_INNER_OBJECT(cx, *obj.address());
} else {
obj = GetGlobalForScopeChain(cx);
}
if (!obj)
return false;
if (protoKey != JSProto_Null) {
JS_ASSERT(JSProto_Null < protoKey);
JS_ASSERT(protoKey < JSProto_LIMIT);
if (!js_GetClassObject(cx, obj, protoKey, &cobj))
return 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));
if (!atom)
return false;
id = ATOM_TO_JSID(atom);
}
JS_ASSERT(obj->isNative());
if (!LookupPropertyWithFlags(cx, obj, id, JSRESOLVE_CLASSNAME, &pobj, &prop))
return false;
Value v = UndefinedValue();
if (prop && pobj->isNative()) {
shape = (Shape *) prop;
if (shape->hasSlot()) {
v = pobj->nativeGetSlot(shape->slot());
if (v.isPrimitive())
v.setUndefined();
}
}
*vp = v;
return true;
}
bool
JSObject::allocSlot(JSContext *cx, uint32_t *slotp)
{
uint32_t slot = slotSpan();
JS_ASSERT(slot >= JSSLOT_FREE(getClass()));
/*
* If this object is in dictionary mode, try to pull a free slot from the
* property table's slot-number freelist.
*/
if (inDictionaryMode()) {
PropertyTable &table = lastProperty()->table();
uint32_t last = table.freelist;
if (last != SHAPE_INVALID_SLOT) {
#ifdef DEBUG
JS_ASSERT(last < slot);
uint32_t next = getSlot(last).toPrivateUint32();
JS_ASSERT_IF(next != SHAPE_INVALID_SLOT, next < slot);
#endif
*slotp = last;
const Value &vref = getSlot(last);
table.freelist = vref.toPrivateUint32();
setSlot(last, UndefinedValue());
return true;
}
}
if (slot >= SHAPE_MAXIMUM_SLOT) {
js_ReportOutOfMemory(cx);
return false;
}
*slotp = slot;
if (inDictionaryMode() && !setSlotSpan(cx, slot + 1))
return false;
return true;
}
void
JSObject::freeSlot(JSContext *cx, uint32_t slot)
{
JS_ASSERT(slot < slotSpan());
if (inDictionaryMode()) {
uint32_t &last = lastProperty()->table().freelist;
/* Can't afford to check the whole freelist, but let's check the head. */
JS_ASSERT_IF(last != SHAPE_INVALID_SLOT, last < slotSpan() && last != slot);
/*
* Place all freed slots other than reserved slots (bug 595230) on the
* dictionary's free list.
*/
if (JSSLOT_FREE(getClass()) <= slot) {
JS_ASSERT_IF(last != SHAPE_INVALID_SLOT, last < slotSpan());
setSlot(slot, PrivateUint32Value(last));
last = slot;
return;
}
}
setSlot(slot, UndefinedValue());
}
static bool
PurgeProtoChain(JSContext *cx, JSObject *obj, jsid id)
{
const Shape *shape;
RootObject objRoot(cx, &obj);
RootId idRoot(cx, &id);
while (obj) {
if (!obj->isNative()) {
obj = obj->getProto();
continue;
}
shape = obj->nativeLookup(cx, id);
if (shape) {
if (!obj->shadowingShapeChange(cx, *shape))
return false;
obj->shadowingShapeChange(cx, *shape);
return true;
}
obj = obj->getProto();
}
return true;
}
bool
js_PurgeScopeChainHelper(JSContext *cx, JSObject *obj, jsid id)
{
RootObject objRoot(cx, &obj);
RootId idRoot(cx, &id);
JS_ASSERT(obj->isDelegate());
PurgeProtoChain(cx, obj->getProto(), id);
/*
* We must purge the scope chain only for Call objects as they are the only
* kind of cacheable non-global object that can gain properties after outer
* properties with the same names have been cached or traced. Call objects
* may gain such properties via eval introducing new vars; see bug 490364.
*/
if (obj->isCall()) {
while ((obj = obj->enclosingScope()) != NULL) {
if (!PurgeProtoChain(cx, obj, id))
return false;
}
}
return true;
}
Shape *
js_AddNativeProperty(JSContext *cx, JSObject *obj, jsid id,
PropertyOp getter, StrictPropertyOp setter, uint32_t slot,
unsigned attrs, unsigned flags, int shortid)
{
JS_ASSERT(!(flags & Shape::METHOD));
/* Convert string indices to integers if appropriate. */
id = js_CheckForStringIndex(id);
/*
* 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.
*/
if (!js_PurgeScopeChain(cx, obj, id))
return NULL;
return obj->putProperty(cx, id, getter, setter, slot, attrs, flags, shortid);
}
Shape *
js_ChangeNativePropertyAttrs(JSContext *cx, JSObject *obj,
Shape *shape, unsigned attrs, unsigned mask,
PropertyOp getter, StrictPropertyOp setter)
{
/*
* Check for freezing an object with shape-memoized methods here, on a
* shape-by-shape basis.
*/
if ((attrs & JSPROP_READONLY) && shape->isMethod()) {
Value v = ObjectValue(*obj->nativeGetMethod(shape));
shape = obj->methodReadBarrier(cx, *shape, &v);
if (!shape)
return NULL;
}
return obj->changeProperty(cx, shape, attrs, mask, getter, setter);
}
JSBool
js_DefineProperty(JSContext *cx, JSObject *obj, jsid id, const Value *value,
PropertyOp getter, StrictPropertyOp setter, unsigned attrs)
{
return !!DefineNativeProperty(cx, obj, id, *value, getter, setter, attrs, 0, 0);
}
JSBool
js_DefineElement(JSContext *cx, JSObject *obj, uint32_t index, const Value *value,
PropertyOp getter, StrictPropertyOp setter, unsigned attrs)
{
jsid id;
if (!IndexToId(cx, index, &id))
return false;
return !!DefineNativeProperty(cx, obj, id, *value, getter, setter, attrs, 0, 0);
}
/*
* Backward compatibility requires allowing addProperty hooks to mutate the
* nominal initial value of a slotful property, while GC safety wants that
* value to be stored before the call-out through the hook. Optimize to do
* both while saving cycles for classes that stub their addProperty hook.
*/
static inline bool
CallAddPropertyHook(JSContext *cx, Class *clasp, JSObject *obj, const Shape *shape, Value *vp)
{
if (clasp->addProperty != JS_PropertyStub) {
Value nominal = *vp;
if (!CallJSPropertyOp(cx, clasp->addProperty, obj, shape->propid(), vp))
return false;
if (*vp != nominal) {
if (shape->hasSlot())
obj->nativeSetSlotWithType(cx, shape, *vp);
}
}
return true;
}
namespace js {
const Shape *
DefineNativeProperty(JSContext *cx, JSObject *obj, jsid id, const Value &value_,
PropertyOp getter, StrictPropertyOp setter, unsigned attrs,
unsigned flags, int shortid, unsigned defineHow /* = 0 */)
{
JS_ASSERT((defineHow & ~(DNP_CACHE_RESULT | DNP_DONT_PURGE |
DNP_SET_METHOD | DNP_SKIP_TYPE)) == 0);
RootObject objRoot(cx, &obj);
RootId idRoot(cx, &id);
/*
* Make a local copy of value, in case a method barrier needs to update the
* value to define, and just so addProperty can mutate its inout parameter.
*/
RootedVarValue value(cx);
value = value_;
/* 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.
*/
Shape *shape = NULL;
if (attrs & (JSPROP_GETTER | JSPROP_SETTER)) {
JSObject *pobj;
JSProperty *prop;
/* Type information for getter/setter properties is unknown. */
AddTypePropertyId(cx, obj, id, types::Type::UnknownType());
MarkTypePropertyConfigured(cx, obj, id);
/*
* If we are defining a getter whose setter was already defined, or
* vice versa, finish the job via obj->changeProperty, and refresh the
* property cache line for (obj, id) to map shape.
*/
if (!js_LookupProperty(cx, obj, id, &pobj, &prop))
return NULL;
if (prop && pobj == obj) {
shape = (Shape *) prop;
if (shape->isAccessorDescriptor()) {
shape = obj->changeProperty(cx, shape, attrs,
JSPROP_GETTER | JSPROP_SETTER,
(attrs & JSPROP_GETTER)
? getter
: shape->getter(),
(attrs & JSPROP_SETTER)
? setter
: shape->setter());
if (!shape)
return NULL;
} else {
shape = NULL;
}
}
}
/*
* Purge the property cache of any properties named by id that are about
* to be shadowed in obj's scope chain unless it is known a priori that it
* is not possible. We do this before locking obj to avoid nesting locks.
*/
if (!(defineHow & DNP_DONT_PURGE)) {
if (!js_PurgeScopeChain(cx, obj, id))
return NULL;
}
/* Use the object's class getter and setter by default. */
Class *clasp = obj->getClass();
if (!(defineHow & DNP_SET_METHOD)) {
if (!getter && !(attrs & JSPROP_GETTER))
getter = clasp->getProperty;
if (!setter && !(attrs & JSPROP_SETTER))
setter = clasp->setProperty;
}
if (((defineHow & DNP_SET_METHOD) || getter == JS_PropertyStub) &&
!(defineHow & DNP_SKIP_TYPE)) {
/*
* Type information for normal native properties should reflect the
* initial value of the property.
*/
AddTypePropertyId(cx, obj, id, value);
if (attrs & JSPROP_READONLY)
MarkTypePropertyConfigured(cx, obj, id);
}
if (!shape) {
/* Add a new property, or replace an existing one of the same id. */
if (defineHow & DNP_SET_METHOD) {
JS_ASSERT(clasp == &ObjectClass);
JS_ASSERT(IsFunctionObject(value));
JS_ASSERT(!(attrs & (JSPROP_GETTER | JSPROP_SETTER)));
JS_ASSERT(!getter && !setter);
JSObject *funobj = &value.raw().toObject();
if (!funobj->toFunction()->isClonedMethod())
flags |= Shape::METHOD;
}
if (const Shape *existingShape = obj->nativeLookup(cx, id)) {
if (existingShape->isMethod() &&
ObjectValue(*obj->nativeGetMethod(existingShape)) == value)
{
/*
* Redefining an existing shape-memoized method object without
* changing the property's value, perhaps to change attributes.
* Clone now via the method read barrier.
*/
if (!obj->methodReadBarrier(cx, *existingShape, value.address()))
return NULL;
}
}
shape = obj->putProperty(cx, id, getter, setter, SHAPE_INVALID_SLOT,
attrs, flags, shortid);
if (!shape)
return NULL;
}
/* Store valueCopy before calling addProperty, in case the latter GC's. */
if (shape->hasSlot())
obj->nativeSetSlot(shape->slot(), value);
if (!CallAddPropertyHook(cx, clasp, obj, shape, value.address())) {
obj->removeProperty(cx, id);
return NULL;
}
return shape;
}
} /* namespace js */
/*
* Call obj's resolve hook.
*
* cx, start, id, and flags are the parameters initially passed to the ongoing
* lookup; objp and propp are its out parameters. obj is an object along
* start's prototype chain.
*
* There are four possible outcomes:
*
* - On failure, report an error or exception and return false.
*
* - If we are already resolving a property of *curobjp, set *recursedp = true,
* and return true.
*
* - If the resolve hook finds or defines the sought property, set *objp and
* *propp appropriately, set *recursedp = false, and return true.
*
* - Otherwise no property was resolved. Set *propp = NULL and *recursedp = false
* and return true.
*/
static JSBool
CallResolveOp(JSContext *cx, JSObject *start, HandleObject obj, HandleId id, unsigned flags,
JSObject **objp, JSProperty **propp, bool *recursedp)
{
Class *clasp = obj->getClass();
JSResolveOp resolve = clasp->resolve;
/*
* Avoid recursion on (obj, id) already being resolved on cx.
*
* Once we have successfully added an entry for (obj, key) to
* cx->resolvingTable, control must go through cleanup: before
* returning. But note that JS_DHASH_ADD may find an existing
* entry, in which case we bail to suppress runaway recursion.
*/
AutoResolving resolving(cx, obj, id);
if (resolving.alreadyStarted()) {
/* Already resolving id in obj -- suppress recursion. */
*recursedp = true;
return true;
}
*recursedp = false;
*propp = NULL;
if (clasp->flags & JSCLASS_NEW_RESOLVE) {
JSNewResolveOp newresolve = reinterpret_cast<JSNewResolveOp>(resolve);
if (flags == RESOLVE_INFER)
flags = js_InferFlags(cx, 0);
RootedVarObject obj2(cx);
obj2 = (clasp->flags & JSCLASS_NEW_RESOLVE_GETS_START) ? start : NULL;
if (!newresolve(cx, obj, id, flags, obj2.address()))
return false;
/*
* We trust the new style resolve hook to set obj2 to NULL when
* the id cannot be resolved. But, when obj2 is not null, we do
* not assume that id must exist and do full nativeLookup for
* compatibility.
*/
if (!obj2)
return true;
if (!obj2->isNative()) {
/* Whoops, newresolve handed back a foreign obj2. */
JS_ASSERT(obj2 != obj);
return obj2->lookupGeneric(cx, id, objp, propp);
}
obj = obj2;
} else {
if (!resolve(cx, obj, id))
return false;
}
if (!obj->nativeEmpty()) {
if (const Shape *shape = obj->nativeLookup(cx, id)) {
*objp = obj;
*propp = (JSProperty *) shape;
}
}
return true;
}
static JS_ALWAYS_INLINE bool
LookupPropertyWithFlagsInline(JSContext *cx, JSObject *obj, jsid id, unsigned flags,
JSObject **objp, JSProperty **propp)
{
/* We should not get string indices which aren't already integers here. */
JS_ASSERT(id == js_CheckForStringIndex(id));
RootObject objRoot(cx, &obj);
RootId idRoot(cx, &id);
/* Search scopes starting with obj and following the prototype link. */
JSObject *start = obj;
while (true) {
const Shape *shape = obj->nativeLookup(cx, id);
if (shape) {
*objp = obj;
*propp = (JSProperty *) shape;
return true;
}
/* Try obj's class resolve hook if id was not found in obj's scope. */
if (obj->getClass()->resolve != JS_ResolveStub) {
bool recursed;
if (!CallResolveOp(cx, start, objRoot, idRoot, flags, objp, propp, &recursed))
return false;
if (recursed)
break;
if (*propp) {
/*
* For stats we do not recalculate protoIndex even if it was
* resolved on some other object.
*/
return true;
}
}
JSObject *proto = obj->getProto();
if (!proto)
break;
if (!proto->isNative()) {
if (!proto->lookupGeneric(cx, id, objp, propp))
return false;
#ifdef DEBUG
/*
* Non-native objects must have either non-native lookup results,
* or else native results from the non-native's prototype chain.
*
* See StackFrame::getValidCalleeObject, where we depend on this
* fact to force a prototype-delegated joined method accessed via
* arguments.callee through the delegating |this| object's method
* read barrier.
*/
if (*propp && (*objp)->isNative()) {
while ((proto = proto->getProto()) != *objp)
JS_ASSERT(proto);
}
#endif
return true;
}
obj = proto;
}
*objp = NULL;
*propp = NULL;
return true;
}
JS_FRIEND_API(JSBool)
js_LookupProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
JSProperty **propp)
{
/* Convert string indices to integers if appropriate. */
id = js_CheckForStringIndex(id);
return LookupPropertyWithFlagsInline(cx, obj, id, cx->resolveFlags, objp, propp);
}
JS_FRIEND_API(JSBool)
js_LookupElement(JSContext *cx, JSObject *obj, uint32_t index, JSObject **objp, JSProperty **propp)
{
jsid id;
if (!IndexToId(cx, index, &id))
return false;
return LookupPropertyWithFlagsInline(cx, obj, id, cx->resolveFlags, objp, propp);
}
bool
js::LookupPropertyWithFlags(JSContext *cx, JSObject *obj, jsid id, unsigned flags,
JSObject **objp, JSProperty **propp)
{
/* Convert string indices to integers if appropriate. */
id = js_CheckForStringIndex(id);
return LookupPropertyWithFlagsInline(cx, obj, id, flags, objp, propp);
}
bool
js::FindPropertyHelper(JSContext *cx, PropertyName *name, bool cacheResult, JSObject *scopeChain,
JSObject **objp, JSObject **pobjp, JSProperty **propp)
{
jsid id = ATOM_TO_JSID(name);
JSObject *obj, *parent, *pobj;
int scopeIndex;
JSProperty *prop;
/* Scan entries on the scope chain that we can cache across. */
obj = scopeChain;
parent = obj->enclosingScope();
for (scopeIndex = 0;
parent
? IsCacheableNonGlobalScope(obj)
: !obj->getOps()->lookupProperty;
++scopeIndex) {
if (!LookupPropertyWithFlags(cx, obj, id, cx->resolveFlags, &pobj, &prop))
return false;
if (prop) {
#ifdef DEBUG
if (parent) {
JS_ASSERT(pobj->isNative());
JS_ASSERT(pobj->getClass() == obj->getClass());
if (obj->isBlock()) {
/*
* A block instance on the scope chain is immutable and
* shares its shape with the compile-time prototype. Thus
* we cannot find any property on the prototype.
*/
JS_ASSERT(pobj->isClonedBlock());
} else {
/* Call and DeclEnvClass objects have no prototypes. */
JS_ASSERT(!obj->getProto());
}
JS_ASSERT(pobj == obj);
} 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()) {
JS_PROPERTY_CACHE(cx).fill(cx, scopeChain, scopeIndex, pobj,
(Shape *) prop);
}
goto out;
}
if (!parent) {
pobj = NULL;
goto out;
}
obj = parent;
parent = obj->enclosingScope();
}
for (;;) {
if (!obj->lookupGeneric(cx, id, &pobj, &prop))
return false;
if (prop)
goto out;
/*
* We conservatively assume that a resolve hook could mutate the scope
* chain during JSObject::lookupGeneric. So we read parent here again.
*/
parent = obj->enclosingScope();
if (!parent) {
pobj = NULL;
break;
}
obj = parent;
}
out:
JS_ASSERT(!!pobj == !!prop);
*objp = obj;
*pobjp = pobj;
*propp = prop;
return true;
}
/*
* On return, if |*pobjp| is a native object, then |*propp| is a |Shape *|.
* Otherwise, its type and meaning depends on the host object's implementation.
*/
bool
js::FindProperty(JSContext *cx, PropertyName *name, JSObject *scopeChain,
JSObject **objp, JSObject **pobjp, JSProperty **propp)
{
return !!FindPropertyHelper(cx, name, false, scopeChain, objp, pobjp, propp);
}
JSObject *
js::FindIdentifierBase(JSContext *cx, JSObject *scopeChain, PropertyName *name)
{
/*
* 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->enclosingScope() != NULL);
JSObject *obj = scopeChain;
/*
* Loop over cacheable objects on the scope chain until we find a
* property. We also stop when we reach the global object skipping any
* farther checks or lookups. For details see the JSOP_BINDNAME case of
* js_Interpret.
*
* The test order here matters because IsCacheableNonGlobalScope
* must not be passed a global object (i.e. one with null parent).
*/
for (int scopeIndex = 0;
obj->isGlobal() || IsCacheableNonGlobalScope(obj);
scopeIndex++) {
JSObject *pobj;
JSProperty *prop;
if (!LookupPropertyWithFlags(cx, obj, name, cx->resolveFlags, &pobj, &prop))
return NULL;
if (prop) {
if (!pobj->isNative()) {
JS_ASSERT(obj->isGlobal());
return obj;
}
JS_ASSERT_IF(obj->isScope(), pobj->getClass() == obj->getClass());
JS_PROPERTY_CACHE(cx).fill(cx, scopeChain, scopeIndex, pobj, (Shape *) prop);
return obj;
}
JSObject *parent = obj->enclosingScope();
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, name, &pobj, &prop))
return NULL;
if (prop)
break;
/*
* We conservatively assume that a resolve hook could mutate the scope
* chain during JSObject::lookupGeneric. So we must check if parent is
* not null here even if it wasn't before the lookup.
*/
JSObject *parent = obj->enclosingScope();
if (!parent)
break;
obj = parent;
} while (!obj->isGlobal());
return obj;
}
static JS_ALWAYS_INLINE JSBool
js_NativeGetInline(JSContext *cx, JSObject *receiver, JSObject *obj, JSObject *pobj,
const Shape *shape, unsigned getHow, Value *vp)
{
JS_ASSERT(pobj->isNative());
if (shape->hasSlot()) {
*vp = pobj->nativeGetSlot(shape->slot());
JS_ASSERT(!vp->isMagic());
JS_ASSERT_IF(!pobj->hasSingletonType() && shape->hasDefaultGetterOrIsMethod(),
js::types::TypeHasProperty(cx, pobj->type(), shape->propid(), *vp));
} else {
vp->setUndefined();
}
if (shape->hasDefaultGetter())
return true;
if (JS_UNLIKELY(shape->isMethod()) && (getHow & JSGET_NO_METHOD_BARRIER))
return true;
jsbytecode *pc;
JSScript *script = cx->stack.currentScript(&pc);
if (script && script->hasAnalysis()) {
analyze::Bytecode *code = script->analysis()->maybeCode(pc);
if (code)
code->accessGetter = true;
}
if (!shape->get(cx, receiver, obj, pobj, vp))
return false;
/* Update slotful shapes according to the value produced by the getter. */
if (shape->hasSlot() && pobj->nativeContains(cx, *shape)) {
/* Method shapes were removed by methodReadBarrier under shape->get(). */
JS_ASSERT(!shape->isMethod());
pobj->nativeSetSlot(shape->slot(), *vp);
}
return true;
}
JSBool
js_NativeGet(JSContext *cx, JSObject *obj, JSObject *pobj, const Shape *shape, unsigned getHow,
Value *vp)
{
return js_NativeGetInline(cx, obj, obj, pobj, shape, getHow, vp);
}
JSBool
js_NativeSet(JSContext *cx, JSObject *obj, const Shape *shape, bool added, bool strict, Value *vp)
{
AddTypePropertyId(cx, obj, shape->propid(), *vp);
JS_ASSERT(obj->isNative());
if (shape->hasSlot()) {
uint32_t slot = shape->slot();
/* If shape has a stub setter, just store *vp. */
if (shape->hasDefaultSetter()) {
if (!added) {
if (shape->isMethod() && !obj->methodShapeChange(cx, *shape))
return false;
}
obj->nativeSetSlot(slot, *vp);
return true;
}
} else {
/*
* Allow API consumers to create shared properties with stub setters.
* Such properties effectively function as data descriptors which are
* not writable, so attempting to set such a property should do nothing
* or throw if we're in strict mode.
*/
if (!shape->hasGetterValue() && shape->hasDefaultSetter())
return js_ReportGetterOnlyAssignment(cx);
}
int32_t sample = cx->runtime->propertyRemovals;
if (!shape->set(cx, obj, strict, vp))
return false;
/*
* Update any slot for the shape with the value produced by the setter,
* unless the setter deleted the shape.
*/
if (shape->hasSlot() &&
(JS_LIKELY(cx->runtime->propertyRemovals == sample) ||
obj->nativeContains(cx, *shape))) {
obj->setSlot(shape->slot(), *vp);
}
return true;
}
static JS_ALWAYS_INLINE JSBool
js_GetPropertyHelperInline(JSContext *cx, JSObject *obj, JSObject *receiver, jsid id,
uint32_t getHow, Value *vp)
{
JSObject *aobj, *obj2;
JSProperty *prop;
const Shape *shape;
/* Convert string indices to integers if appropriate. */
id = js_CheckForStringIndex(id);
aobj = js_GetProtoIfDenseArray(obj);
/* This call site is hot -- use the always-inlined variant of LookupPropertyWithFlags(). */
if (!LookupPropertyWithFlagsInline(cx, aobj, id, cx->resolveFlags, &obj2, &prop))
return false;
if (!prop) {
vp->setUndefined();
if (!CallJSPropertyOp(cx, obj->getClass()->getProperty, obj, id, vp))
return JS_FALSE;
/* Record non-undefined values produced by the class getter hook. */
if (!vp->isUndefined())
AddTypePropertyId(cx, obj, id, *vp);
/*
* 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 = (JSOp) *pc;
if (op == JSOP_GETXPROP) {
/* Undefined property during a name lookup, report an error. */
JSAutoByteString printable;
if (js_ValueToPrintable(cx, IdToValue(id), &printable))
js_ReportIsNotDefined(cx, printable.ptr());
return false;
}
if (!cx->hasStrictOption() ||
cx->stack.currentScript()->warnedAboutUndefinedProp ||
(op != JSOP_GETPROP && op != JSOP_GETELEM)) {
return JS_TRUE;
}
/*
* XXX do not warn about missing __iterator__ as the function
* may be called from JS_GetMethodById. See bug 355145.
*/
if (JSID_IS_ATOM(id, cx->runtime->atomState.iteratorAtom))
return JS_TRUE;
/* Do not warn about tests like (obj[prop] == undefined). */
if (cx->resolveFlags == RESOLVE_INFER) {
pc += js_CodeSpec[op].length;
if (Detecting(cx, pc))
return JS_TRUE;
} else if (cx->resolveFlags & JSRESOLVE_DETECTING) {
return JS_TRUE;
}
unsigned flags = JSREPORT_WARNING | JSREPORT_STRICT;
cx->stack.currentScript()->warnedAboutUndefinedProp = true;
/* 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 false;
}
}
return JS_TRUE;
}
if (!obj2->isNative()) {
return obj2->isProxy()
? Proxy::get(cx, obj2, receiver, id, vp)
: obj2->getGeneric(cx, id, vp);
}
shape = (Shape *) prop;
if (getHow & JSGET_CACHE_RESULT)
JS_PROPERTY_CACHE(cx).fill(cx, aobj, 0, obj2, shape);
/* This call site is hot -- use the always-inlined variant of js_NativeGet(). */
if (!js_NativeGetInline(cx, receiver, obj, obj2, shape, getHow, vp))
return JS_FALSE;
return JS_TRUE;
}
bool
js::GetPropertyHelper(JSContext *cx, JSObject *obj, jsid id, uint32_t getHow, Value *vp)
{
return !!js_GetPropertyHelperInline(cx, obj, obj, id, getHow, vp);
}
JSBool
js_GetProperty(JSContext *cx, JSObject *obj, JSObject *receiver, jsid id, Value *vp)
{
/* This call site is hot -- use the always-inlined variant of js_GetPropertyHelper(). */
return js_GetPropertyHelperInline(cx, obj, receiver, id, JSGET_METHOD_BARRIER, vp);
}
JSBool
js_GetElement(JSContext *cx, JSObject *obj, JSObject *receiver, uint32_t index, Value *vp)
{
jsid id;
if (!IndexToId(cx, index, &id))
return false;
/* This call site is hot -- use the always-inlined variant of js_GetPropertyHelper(). */
return js_GetPropertyHelperInline(cx, obj, receiver, id, JSGET_METHOD_BARRIER, vp);
}
JSBool
js::GetPropertyDefault(JSContext *cx, JSObject *obj, jsid id, const Value &def, Value *vp)
{
JSProperty *prop;
JSObject *obj2;
if (!LookupPropertyWithFlags(cx, obj, id, JSRESOLVE_QUALIFIED, &obj2, &prop))
return false;
if (!prop) {
*vp = def;
return true;
}
return js_GetProperty(cx, obj2, id, vp);
}
JSBool
js_GetMethod(JSContext *cx, JSObject *obj, jsid id, unsigned getHow, Value *vp)
{
JSAutoResolveFlags rf(cx, JSRESOLVE_QUALIFIED);
GenericIdOp op = obj->getOps()->getGeneric;
if (!op) {
#if JS_HAS_XML_SUPPORT
JS_ASSERT(!obj->isXML());
#endif
return GetPropertyHelper(cx, obj, id, getHow, vp);
}
#if JS_HAS_XML_SUPPORT
if (obj->isXML())
return js_GetXMLMethod(cx, obj, id, vp);
#endif
return op(cx, obj, obj, id, vp);
}
JS_FRIEND_API(bool)
js::CheckUndeclaredVarAssignment(JSContext *cx, JSString *propname)
{
StackFrame *const fp = js_GetTopStackFrame(cx, FRAME_EXPAND_ALL);
if (!fp)
return true;
/* If neither cx nor the code is strict, then no check is needed. */
if (!(fp->isScriptFrame() && fp->script()->strictModeCode) &&
!cx->hasStrictOption()) {
return true;
}
JSAutoByteString bytes(cx, propname);
return !!bytes &&
JS_ReportErrorFlagsAndNumber(cx,
(JSREPORT_WARNING | JSREPORT_STRICT
| JSREPORT_STRICT_MODE_ERROR),
js_GetErrorMessage, NULL,
JSMSG_UNDECLARED_VAR, bytes.ptr());
}
static bool
ReportReadOnly(JSContext *cx, jsid id, unsigned report)
{
return js_ReportValueErrorFlags(cx, report, JSMSG_READ_ONLY,
JSDVG_IGNORE_STACK, IdToValue(id), NULL,
NULL, NULL);
}
bool
JSObject::reportNotConfigurable(JSContext *cx, jsid id, unsigned report)
{
return js_ReportValueErrorFlags(cx, report, JSMSG_CANT_DELETE,
JSDVG_IGNORE_STACK, IdToValue(id), NULL,
NULL, NULL);
}
bool
JSObject::reportNotExtensible(JSContext *cx, unsigned report)
{
return js_ReportValueErrorFlags(cx, report, JSMSG_OBJECT_NOT_EXTENSIBLE,
JSDVG_IGNORE_STACK, ObjectValue(*this),
NULL, NULL, NULL);
}
bool
JSObject::callMethod(JSContext *cx, jsid id, unsigned argc, Value *argv, Value *vp)
{
Value fval;
return js_GetMethod(cx, this, id, JSGET_NO_METHOD_BARRIER, &fval) &&
Invoke(cx, ObjectValue(*this), fval, argc, argv, vp);
}
static bool
CloneFunctionForSetMethod(JSContext *cx, Value *vp)
{
JSFunction *fun = vp->toObject().toFunction();
/* Clone the fun unless it already has been. */
if (!fun->isClonedMethod()) {
fun = CloneFunctionObject(cx, fun);
if (!fun)
return false;
vp->setObject(*fun);
}
return true;
}
JSBool
js_SetPropertyHelper(JSContext *cx, JSObject *obj, jsid id, unsigned defineHow,
Value *vp, JSBool strict)
{
JSObject *pobj;
JSProperty *prop;
const Shape *shape;
unsigned attrs, flags;
int shortid;
Class *clasp;
PropertyOp getter;
StrictPropertyOp setter;
bool added;
JS_ASSERT((defineHow & ~(DNP_CACHE_RESULT | DNP_SET_METHOD | DNP_UNQUALIFIED)) == 0);
/* Convert string indices to integers if appropriate. */
id = js_CheckForStringIndex(id);
if (JS_UNLIKELY(obj->watched())) {
/* Fire watchpoints, if any. */
WatchpointMap *wpmap = cx->compartment->watchpointMap;
if (wpmap && !wpmap->triggerWatchpoint(cx, obj, id, vp))
return false;
/* A watchpoint handler may set *vp to a non-function value. */
defineHow &= ~DNP_SET_METHOD;
}
if (!LookupPropertyWithFlags(cx, obj, id, cx->resolveFlags, &pobj, &prop))
return false;
if (prop) {
if (!pobj->isNative()) {
if (pobj->isProxy()) {
AutoPropertyDescriptorRooter pd(cx);
if (!Proxy::getPropertyDescriptor(cx, pobj, id, true, &pd))
return false;
if ((pd.attrs & (JSPROP_SHARED | JSPROP_SHADOWABLE)) == JSPROP_SHARED) {
return !pd.setter ||
CallSetter(cx, obj, id, pd.setter, pd.attrs, pd.shortid, strict, vp);
}
if (pd.attrs & JSPROP_READONLY) {
if (strict)
return ReportReadOnly(cx, id, JSREPORT_ERROR);
if (cx->hasStrictOption())
return ReportReadOnly(cx, id, JSREPORT_STRICT | JSREPORT_WARNING);
return true;
}
}
prop = NULL;
}
} else {
/* We should never add properties to lexical blocks. */
JS_ASSERT(!obj->isBlock());
if (obj->isGlobal() &&
(defineHow & DNP_UNQUALIFIED) &&
!js::CheckUndeclaredVarAssignment(cx, JSID_TO_STRING(id))) {
return JS_FALSE;
}
}
shape = (Shape *) prop;
/*
* Now either shape is null, meaning id was not found in obj or one of its
* prototypes; or shape is non-null, meaning id was found directly in pobj.
*/
attrs = JSPROP_ENUMERATE;
flags = 0;
shortid = 0;
clasp = obj->getClass();
getter = clasp->getProperty;
setter = clasp->setProperty;
if (shape) {
/* ES5 8.12.4 [[Put]] step 2. */
if (shape->isAccessorDescriptor()) {
if (shape->hasDefaultSetter())
return js_ReportGetterOnlyAssignment(cx);
} else {
JS_ASSERT(shape->isDataDescriptor());
if (!shape->writable()) {
/* Error in strict mode code, warn with strict option, otherwise do nothing. */
if (strict)
return ReportReadOnly(cx, id, JSREPORT_ERROR);
if (cx->hasStrictOption())
return ReportReadOnly(cx, id, JSREPORT_STRICT | JSREPORT_WARNING);
return JS_TRUE;
}
}
attrs = shape->attributes();
if (pobj != obj) {
/*
* We found id in a prototype object: prepare to share or shadow.
*/
if (!shape->shadowable()) {
if (defineHow & DNP_SET_METHOD) {
JS_ASSERT(!shape->isMethod());
if (!CloneFunctionForSetMethod(cx, vp))
return false;
}
if (defineHow & DNP_CACHE_RESULT)
JS_PROPERTY_CACHE(cx).fill(cx, obj, 0, pobj, shape);
if (shape->hasDefaultSetter() && !shape->hasGetterValue())
return JS_TRUE;
return shape->set(cx, obj, strict, vp);
}
/*
* Preserve attrs except JSPROP_SHARED, getter, and setter when
* shadowing any property that has no slot (is shared). We must
* clear the shared attribute for the shadowing shape so that the
* property in obj that it defines has a slot to retain the value
* being set, in case the setter simply cannot operate on instances
* of obj's class by storing the value in some class-specific
* location.
*
* A subset of slotless shared properties is the set of properties
* with shortids, which must be preserved too. An old API requires
* that the property's getter and setter receive the shortid, not
* id, when they are called on the shadowing property that we are
* about to create in obj.
*/
if (!shape->hasSlot()) {
defineHow &= ~DNP_SET_METHOD;
if (shape->hasShortID()) {
flags = Shape::HAS_SHORTID;
shortid = shape->shortid();
}
attrs &= ~JSPROP_SHARED;
getter = shape->getter();
setter = shape->setter();
} else {
/* Restore attrs to the ECMA default for new properties. */
attrs = JSPROP_ENUMERATE;
}
/*
* Forget we found the proto-property now that we've copied any
* needed member values.
*/
shape = NULL;
}
if (shape && (defineHow & DNP_SET_METHOD)) {
/*
* JSOP_SETMETHOD is assigning to an existing own property. If it
* is an identical method property, do nothing. Otherwise downgrade
* to ordinary assignment. Either way, do not fill the property
* cache, as the interpreter has no fast path for these unusual
* cases.
*/
if (shape->isMethod()) {
if (obj->nativeGetMethod(shape) == &vp->toObject())
return true;
shape = obj->methodShapeChange(cx, *shape);
if (!shape)
return false;
}
if (!CloneFunctionForSetMethod(cx, vp))
return false;
return js_NativeSet(cx, obj, shape, false, strict, vp);
}
}
added = false;
if (!shape) {
if (!obj->isExtensible()) {
/* Error in strict mode code, warn with strict option, otherwise do nothing. */
if (strict)
return obj->reportNotExtensible(cx);
if (cx->hasStrictOption())
return obj->reportNotExtensible(cx, JSREPORT_STRICT | JSREPORT_WARNING);
return JS_TRUE;
}
/*
* Purge the property cache of now-shadowed id in obj's scope chain.
* Do this early, before locking obj to avoid nesting locks.
*/
if (!js_PurgeScopeChain(cx, obj, id))
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 & DNP_SET_METHOD) && obj->canHaveMethodBarrier()) {
JS_ASSERT(IsFunctionObject(*vp));
JS_ASSERT(!(attrs & (JSPROP_GETTER | JSPROP_SETTER)));
JSObject *funobj = &vp->toObject();
if (!funobj->toFunction()->isClonedMethod())
flags |= Shape::METHOD;
}
shape = obj->putProperty(cx, id, getter, setter, SHAPE_INVALID_SLOT,
attrs, flags, shortid);
if (!shape)
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 DefineNativeProperty.
*/
if (shape->hasSlot())
obj->nativeSetSlot(shape->slot(), UndefinedValue());
/* XXXbe called with obj locked */
if (!CallAddPropertyHook(cx, clasp, obj, shape, vp)) {
obj->removeProperty(cx, id);
return JS_FALSE;
}
added = true;
}
if ((defineHow & DNP_CACHE_RESULT) && !added)
JS_PROPERTY_CACHE(cx).fill(cx, obj, 0, obj, shape);
return js_NativeSet(cx, obj, shape, added, strict, vp);
}
JSBool
js_SetElementHelper(JSContext *cx, JSObject *obj, uint32_t index, unsigned defineHow,
Value *vp, JSBool strict)
{
jsid id;
if (!IndexToId(cx, index, &id))
return false;
return js_SetPropertyHelper(cx, obj, id, defineHow, vp, strict);
}
JSBool
js_GetAttributes(JSContext *cx, JSObject *obj, jsid id, unsigned *attrsp)
{
JSProperty *prop;
if (!js_LookupProperty(cx, obj, id, &obj, &prop))
return false;
if (!prop) {
*attrsp = 0;
return true;
}
if (!obj->isNative())
return obj->getGenericAttributes(cx, id, attrsp);
const Shape *shape = (Shape *)prop;
*attrsp = shape->attributes();
return true;
}
JSBool
js_GetElementAttributes(JSContext *cx, JSObject *obj, uint32_t index, unsigned *attrsp)
{
JSProperty *prop;
if (!js_LookupElement(cx, obj, index, &obj, &prop))
return false;
if (!prop) {
*attrsp = 0;
return true;
}
if (!obj->isNative())
return obj->getElementAttributes(cx, index, attrsp);
const Shape *shape = (Shape *)prop;
*attrsp = shape->attributes();
return true;
}
JSBool
js_SetNativeAttributes(JSContext *cx, JSObject *obj, Shape *shape, unsigned attrs)
{
JS_ASSERT(obj->isNative());
return !!js_ChangeNativePropertyAttrs(cx, obj, shape, attrs, 0,
shape->getter(), shape->setter());
}
JSBool
js_SetAttributes(JSContext *cx, JSObject *obj, jsid id, unsigned *attrsp)
{
JSProperty *prop;
if (!js_LookupProperty(cx, obj, id, &obj, &prop))
return false;
if (!prop)
return true;
return obj->isNative()
? js_SetNativeAttributes(cx, obj, (Shape *) prop, *attrsp)
: obj->setGenericAttributes(cx, id, attrsp);
}
JSBool
js_SetElementAttributes(JSContext *cx, JSObject *obj, uint32_t index, unsigned *attrsp)
{
JSProperty *prop;
if (!js_LookupElement(cx, obj, index, &obj, &prop))
return false;
if (!prop)
return true;
return obj->isNative()
? js_SetNativeAttributes(cx, obj, (Shape *) prop, *attrsp)
: obj->setElementAttributes(cx, index, attrsp);
}
JSBool
js_DeleteGeneric(JSContext *cx, JSObject *obj, jsid id, Value *rval, JSBool strict)
{
JSObject *proto;
JSProperty *prop;
const Shape *shape;
rval->setBoolean(true);
/* Convert string indices to integers if appropriate. */
id = js_CheckForStringIndex(id);
if (!js_LookupProperty(cx, obj, id, &proto, &prop))
return false;
if (!prop || proto != obj) {
/*
* If no property, or the property comes from a prototype, call the
* class's delProperty hook, passing rval as the result parameter.
*/
return CallJSPropertyOp(cx, obj->getClass()->delProperty, obj, id, rval);
}
shape = (Shape *)prop;
if (!shape->configurable()) {
if (strict)
return obj->reportNotConfigurable(cx, id);
rval->setBoolean(false);
return true;
}
if (shape->hasSlot()) {
const Value &v = obj->nativeGetSlot(shape->slot());
GCPoke(cx->runtime, 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.
*/
JSFunction *fun;
if (IsFunctionObject(v, &fun) && fun->isClonedMethod()) {
for (StackFrame *fp = cx->maybefp(); fp; fp = fp->prev()) {
if (fp->isFunctionFrame() &&
fp->fun()->script() == fun->script() &&
fp->thisValue().isObject())
{
JSObject *tmp = &fp->thisValue().toObject();
do {
if (tmp == obj) {
fp->overwriteCallee(*fun);
break;
}
} while ((tmp = tmp->getProto()) != NULL);
}
}
}
}
if (!CallJSPropertyOp(cx, obj->getClass()->delProperty, obj, shape->getUserId(), rval))
return false;
if (rval->isFalse())
return true;
return obj->removeProperty(cx, id) && js_SuppressDeletedProperty(cx, obj, id);
}
JSBool
js_DeleteProperty(JSContext *cx, JSObject *obj, PropertyName *name, Value *rval, JSBool strict)
{
return js_DeleteGeneric(cx, obj, ATOM_TO_JSID(name), rval, strict);
}
JSBool
js_DeleteElement(JSContext *cx, JSObject *obj, uint32_t index, Value *rval, JSBool strict)
{
jsid id;
if (!IndexToId(cx, index, &id))
return false;
return js_DeleteGeneric(cx, obj, id, rval, strict);
}
JSBool
js_DeleteSpecial(JSContext *cx, JSObject *obj, SpecialId sid, Value *rval, JSBool strict)
{
return js_DeleteGeneric(cx, obj, SPECIALID_TO_JSID(sid), rval, strict);
}
namespace js {
bool
HasDataProperty(JSContext *cx, JSObject *obj, jsid methodid, Value *vp)
{
if (const Shape *shape = obj->nativeLookup(cx, methodid)) {
if (shape->hasDefaultGetterOrIsMethod() && shape->hasSlot()) {
*vp = obj->nativeGetSlot(shape->slot());
return true;
}
}
return false;
}
/*
* Gets |obj[id]|. If that value's not callable, returns true and stores a
* non-primitive value in *vp. If it's callable, calls it with no arguments
* and |obj| as |this|, returning the result in *vp.
*
* This is a mini-abstraction for ES5 8.12.8 [[DefaultValue]], either steps 1-2
* or steps 3-4.
*/
static bool
MaybeCallMethod(JSContext *cx, JSObject *obj, jsid id, Value *vp)
{
if (!js_GetMethod(cx, obj, id, JSGET_NO_METHOD_BARRIER, vp))
return false;
if (!js_IsCallable(*vp)) {
*vp = ObjectValue(*obj);
return true;
}
return Invoke(cx, ObjectValue(*obj), *vp, 0, NULL, vp);
}
JSBool
DefaultValue(JSContext *cx, JSObject *obj, JSType hint, Value *vp)
{
JS_ASSERT(hint == JSTYPE_NUMBER || hint == JSTYPE_STRING || hint == JSTYPE_VOID);
JS_ASSERT(!obj->isXML());
Class *clasp = obj->getClass();
if (hint == JSTYPE_STRING) {
/* Optimize (new String(...)).toString(). */
if (clasp == &StringClass &&
ClassMethodIsNative(cx, obj,
&StringClass,
ATOM_TO_JSID(cx->runtime->atomState.toStringAtom),
js_str_toString)) {
*vp = StringValue(obj->asString().unbox());
return true;
}
if (!MaybeCallMethod(cx, obj, ATOM_TO_JSID(cx->runtime->atomState.toStringAtom), vp))
return false;
if (vp->isPrimitive())
return true;
if (!MaybeCallMethod(cx, obj, ATOM_TO_JSID(cx->runtime->atomState.valueOfAtom), vp))
return false;
if (vp->isPrimitive())
return true;
} else {
/* Optimize (new String(...)).valueOf(). */
if ((clasp == &StringClass &&
ClassMethodIsNative(cx, obj, &StringClass,
ATOM_TO_JSID(cx->runtime->atomState.valueOfAtom),
js_str_toString)) ||
(clasp == &NumberClass &&
ClassMethodIsNative(cx, obj, &NumberClass,
ATOM_TO_JSID(cx->runtime->atomState.valueOfAtom),
js_num_valueOf))) {
*vp = obj->isString()
? StringValue(obj->asString().unbox())
: NumberValue(obj->asNumber().unbox());
return true;
}
if (!MaybeCallMethod(cx, obj, ATOM_TO_JSID(cx->runtime->atomState.valueOfAtom), vp))
return false;
if (vp->isPrimitive())
return true;
if (!MaybeCallMethod(cx, obj, ATOM_TO_JSID(cx->runtime->atomState.toStringAtom), vp))
return false;
if (vp->isPrimitive())
return true;
}
/* Avoid recursive death when decompiling in js_ReportValueError. */
JSString *str;
if (hint == JSTYPE_STRING) {
str = JS_InternString(cx, clasp->name);
if (!str)
return false;
} else {
str = NULL;
}
js_ReportValueError2(cx, JSMSG_CANT_CONVERT_TO, JSDVG_SEARCH_STACK, ObjectValue(*obj), str,
(hint == JSTYPE_VOID) ? "primitive type" : JS_TYPE_STR(hint));
return false;
}
} /* namespace js */
JS_FRIEND_API(JSBool)
JS_EnumerateState(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 ((JSNewEnumerateOp) 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, unsigned *attrsp)
{
JSBool writing;
JSObject *pobj;
JSProperty *prop;
const Shape *shape;
while (JS_UNLIKELY(obj->isWith()))
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->lookupGeneric(cx, id, &pobj, &prop))
return JS_FALSE;
if (!prop) {
if (!writing)
vp->setUndefined();
*attrsp = 0;
pobj = obj;
break;
}
if (!pobj->isNative()) {
if (!writing) {
vp->setUndefined();
*attrsp = 0;
}
break;
}
shape = (Shape *)prop;
*attrsp = shape->attributes();
if (!writing) {
if (shape->hasSlot())
*vp = pobj->nativeGetSlot(shape->slot());
else
vp->setUndefined();
}
}
JS_ASSERT_IF(*attrsp & JSPROP_READONLY, !(*attrsp & (JSPROP_GETTER | JSPROP_SETTER)));
/*
* 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.
*/
JSCheckAccessOp check = pobj->getClass()->checkAccess;
if (!check)
check = cx->runtime->securityCallbacks->checkObjectAccess;
return !check || check(cx, pobj, id, mode, vp);
}
}
JSType
js_TypeOf(JSContext *cx, JSObject *obj)
{
return obj->isCallable() ? JSTYPE_FUNCTION : JSTYPE_OBJECT;
}
bool
js_IsDelegate(JSContext *cx, JSObject *obj, const Value &v)
{
if (v.isPrimitive())
return false;
JSObject *obj2 = &v.toObject();
while ((obj2 = obj2->getProto()) != NULL) {
if (obj2 == obj)
return true;
}
return false;
}
bool
js::FindClassPrototype(JSContext *cx, JSObject *scopeobj, JSProtoKey protoKey,
JSObject **protop, Class *clasp)
{
Value v;
if (!js_FindClassObject(cx, scopeobj, protoKey, &v, clasp))
return false;
if (IsFunctionObject(v)) {
JSObject *ctor = &v.toObject();
if (!ctor->getProperty(cx, cx->runtime->atomState.classPrototypeAtom, &v))
return false;
}
*protop = v.isObject() ? &v.toObject() : NULL;
return true;
}
/*
* The first part of this function has been hand-expanded and optimized into
* NewBuiltinClassInstance in jsobjinlines.h.
*/
JSBool
js_GetClassPrototype(JSContext *cx, JSObject *scopeobj, JSProtoKey protoKey,
JSObject **protop, Class *clasp)
{
JS_ASSERT(JSProto_Null <= protoKey);
JS_ASSERT(protoKey < JSProto_LIMIT);
if (protoKey != JSProto_Null) {
GlobalObject *global;
if (scopeobj) {
global = &scopeobj->global();
} else {
global = GetCurrentGlobal(cx);
if (!global) {
*protop = NULL;
return true;
}
}
const Value &v = global->getReservedSlot(JSProto_LIMIT + protoKey);
if (v.isObject()) {
*protop = &v.toObject();
return true;
}
}
return FindClassPrototype(cx, scopeobj, protoKey, protop, clasp);
}
JSObject *
PrimitiveToObject(JSContext *cx, const Value &v)
{
if (v.isString())
return StringObject::create(cx, v.toString());
if (v.isNumber())
return NumberObject::create(cx, v.toNumber());
JS_ASSERT(v.isBoolean());
return BooleanObject::create(cx, v.toBoolean());
}
JSBool
js_PrimitiveToObject(JSContext *cx, Value *vp)
{
JSObject *obj = PrimitiveToObject(cx, *vp);
if (!obj)
return false;
vp->setObject(*obj);
return true;
}
JSBool
js_ValueToObjectOrNull(JSContext *cx, const Value &v, JSObject **objp)
{
JSObject *obj;
if (v.isObjectOrNull()) {
obj = v.toObjectOrNull();
} else if (v.isUndefined()) {
obj = NULL;
} else {
obj = PrimitiveToObject(cx, v);
if (!obj)
return false;
}
*objp = obj;
return true;
}
namespace js {
/* Callers must handle the already-object case . */
JSObject *
ToObjectSlow(JSContext *cx, Value *vp)
{
JS_ASSERT(!vp->isMagic());
JS_ASSERT(!vp->isObject());
if (vp->isNullOrUndefined()) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CANT_CONVERT_TO,
vp->isNull() ? "null" : "undefined", "object");
return NULL;
}
JSObject *obj = PrimitiveToObject(cx, *vp);
if (obj)
vp->setObject(*obj);
return obj;
}
}
JSObject *
js_ValueToNonNullObject(JSContext *cx, const Value &v)
{
JSObject *obj;
if (!js_ValueToObjectOrNull(cx, v, &obj))
return NULL;
if (!obj)
js_ReportIsNullOrUndefined(cx, JSDVG_SEARCH_STACK, v, NULL);
return obj;
}
#ifdef DEBUG
void
js_PrintObjectSlotName(JSTracer *trc, char *buf, size_t bufsize)
{
JS_ASSERT(trc->debugPrinter == js_PrintObjectSlotName);
JSObject *obj = (JSObject *)trc->debugPrintArg;
uint32_t slot = uint32_t(trc->debugPrintIndex);
const Shape *shape;
if (obj->isNative()) {
shape = obj->lastProperty();
while (shape && (!shape->hasSlot() || shape->slot() != slot))
shape = shape->previous();
} else {
shape = NULL;
}
if (!shape) {
const char *slotname = NULL;
if (obj->isGlobal()) {
#define JS_PROTO(name,code,init) \
if ((code) == slot) { slotname = js_##name##_str; goto found; }
#include "jsproto.tbl"
#undef JS_PROTO
}
found:
if (slotname)
JS_snprintf(buf, bufsize, "CLASS_OBJECT(%s)", slotname);
else
JS_snprintf(buf, bufsize, "**UNKNOWN SLOT %ld**", (long)slot);
} else {
jsid propid = shape->propid();
if (JSID_IS_INT(propid)) {
JS_snprintf(buf, bufsize, "%ld", (long)JSID_TO_INT(propid));
} else if (JSID_IS_ATOM(propid)) {
PutEscapedString(buf, bufsize, JSID_TO_ATOM(propid), 0);
} else {
JS_snprintf(buf, bufsize, "**FINALIZED ATOM KEY**");
}
}
}
#endif
static const Shape *
LastConfigurableShape(JSObject *obj)
{
for (Shape::Range r(obj->lastProperty()->all()); !r.empty(); r.popFront()) {
const Shape *shape = &r.front();
if (shape->configurable())
return shape;
}
return NULL;
}
bool
js_ClearNative(JSContext *cx, JSObject *obj)
{
/* Remove all configurable properties from obj. */
while (const Shape *shape = LastConfigurableShape(obj)) {
if (!obj->removeProperty(cx, shape->propid()))
return false;
}
/* Set all remaining writable plain data properties to undefined. */
for (Shape::Range r(obj->lastProperty()->all()); !r.empty(); r.popFront()) {
const Shape *shape = &r.front();
if (shape->isDataDescriptor() &&
shape->writable() &&
shape->hasDefaultSetter() &&
shape->hasSlot()) {
obj->nativeSetSlot(shape->slot(), UndefinedValue());
}
}
return true;
}
JSBool
js_ReportGetterOnlyAssignment(JSContext *cx)
{
return JS_ReportErrorFlagsAndNumber(cx,
JSREPORT_WARNING | JSREPORT_STRICT |
JSREPORT_STRICT_MODE_ERROR,
js_GetErrorMessage, NULL,
JSMSG_GETTER_ONLY);
}
JS_FRIEND_API(JSBool)
js_GetterOnlyPropertyStub(JSContext *cx, JSObject *obj, jsid id, JSBool strict, jsval *vp)
{
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_GETTER_ONLY);
return JS_FALSE;
}
#ifdef DEBUG
/*
* Routines to print out values during debugging. These are FRIEND_API to help
* the debugger find them and to support temporarily hacking js_Dump* calls
* into other code.
*/
void
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())
v.toString()->dump();
else if (v.isObject() && v.toObject().isFunction()) {
JSFunction *fun = v.toObject().toFunction();
if (fun->atom) {
fputs("<function ", stderr);
FileEscapedString(stderr, fun->atom, 0);
} else {
fputs("<unnamed function", stderr);
}
if (fun->isInterpreted()) {
JSScript *script = fun->script();
fprintf(stderr, " (%s:%u)",
script->filename ? script->filename : "", script->lineno);
}
fprintf(stderr, " at %p>", (void *) fun);
} else if (v.isObject()) {
JSObject *obj = &v.toObject();
Class *clasp = obj->getClass();
fprintf(stderr, "<%s%s at %p>",
clasp->name,
(clasp == &ObjectClass) ? "" : " object",
(void *) obj);
} else if (v.isBoolean()) {
if (v.toBoolean())
fprintf(stderr, "true");
else
fprintf(stderr, "false");
} else if (v.isMagic()) {
fprintf(stderr, "<invalid");
#ifdef DEBUG
switch (v.whyMagic()) {
case JS_ARRAY_HOLE: fprintf(stderr, " array hole"); break;
case JS_ARGS_HOLE: fprintf(stderr, " args hole"); break;
case JS_NATIVE_ENUMERATE: fprintf(stderr, " native enumeration"); break;
case JS_NO_ITER_VALUE: fprintf(stderr, " no iter value"); break;
case JS_GENERATOR_CLOSING: fprintf(stderr, " generator closing"); break;
default: fprintf(stderr, " ?!"); break;
}
#endif
fprintf(stderr, ">");
} else {
fprintf(stderr, "unexpected value");
}
}
JS_FRIEND_API(void)
js_DumpValue(const Value &val)
{
dumpValue(val);
fputc('\n', stderr);
}
JS_FRIEND_API(void)
js_DumpId(jsid id)
{
fprintf(stderr, "jsid %p = ", (void *) JSID_BITS(id));
dumpValue(IdToValue(id));
fputc('\n', stderr);
}
static void
DumpProperty(JSObject *obj, const Shape &shape)
{
jsid id = shape.propid();
uint8_t attrs = shape.attributes();
fprintf(stderr, " ((Shape *) %p) ", (void *) &shape);
if (attrs & JSPROP_ENUMERATE) fprintf(stderr, "enumerate ");
if (attrs & JSPROP_READONLY) fprintf(stderr, "readonly ");
if (attrs & JSPROP_PERMANENT) fprintf(stderr, "permanent ");
if (attrs & JSPROP_SHARED) fprintf(stderr, "shared ");
if (shape.isMethod()) fprintf(stderr, "method ");
if (shape.hasGetterValue())
fprintf(stderr, "getterValue=%p ", (void *) shape.getterObject());
else if (!shape.hasDefaultGetter())
fprintf(stderr, "getterOp=%p ", JS_FUNC_TO_DATA_PTR(void *, shape.getterOp()));
if (shape.hasSetterValue())
fprintf(stderr, "setterValue=%p ", (void *) shape.setterObject());
else if (!shape.hasDefaultSetter())
fprintf(stderr, "setterOp=%p ", JS_FUNC_TO_DATA_PTR(void *, shape.setterOp()));
if (JSID_IS_ATOM(id))
JSID_TO_STRING(id)->dump();
else if (JSID_IS_INT(id))
fprintf(stderr, "%d", (int) JSID_TO_INT(id));
else
fprintf(stderr, "unknown jsid %p", (void *) JSID_BITS(id));
uint32_t slot = shape.hasSlot() ? shape.maybeSlot() : SHAPE_INVALID_SLOT;
fprintf(stderr, ": slot %d", slot);
if (shape.hasSlot()) {
fprintf(stderr, " = ");
dumpValue(obj->getSlot(slot));
} else if (slot != SHAPE_INVALID_SLOT) {
fprintf(stderr, " (INVALID!)");
}
fprintf(stderr, "\n");
}
void
JSObject::dump()
{
JSObject *obj = this;
fprintf(stderr, "object %p\n", (void *) obj);
Class *clasp = obj->getClass();
fprintf(stderr, "class %p %s\n", (void *)clasp, clasp->name);
fprintf(stderr, "flags:");
if (obj->isDelegate()) fprintf(stderr, " delegate");
if (obj->isSystem()) fprintf(stderr, " system");
if (!obj->isExtensible()) fprintf(stderr, " not_extensible");
if (obj->isIndexed()) fprintf(stderr, " indexed");
if (obj->isNative()) {
if (obj->inDictionaryMode())
fprintf(stderr, " inDictionaryMode");
if (obj->hasPropertyTable())
fprintf(stderr, " hasPropertyTable");
}
fprintf(stderr, "\n");
if (obj->isDenseArray()) {
unsigned slots = obj->getDenseArrayInitializedLength();
fprintf(stderr, "elements\n");
for (unsigned i = 0; i < slots; i++) {
fprintf(stderr, " %3d: ", i);
dumpValue(obj->getDenseArrayElement(i));
fprintf(stderr, "\n");
fflush(stderr);
}
return;
}
fprintf(stderr, "proto ");
dumpValue(ObjectOrNullValue(obj->getProto()));
fputc('\n', stderr);
fprintf(stderr, "parent ");
dumpValue(ObjectOrNullValue(obj->getParent()));
fputc('\n', stderr);
if (clasp->flags & JSCLASS_HAS_PRIVATE)
fprintf(stderr, "private %p\n", obj->getPrivate());
if (!obj->isNative())
fprintf(stderr, "not native\n");
unsigned reservedEnd = JSCLASS_RESERVED_SLOTS(clasp);
unsigned slots = obj->slotSpan();
unsigned stop = obj->isNative() ? reservedEnd : slots;
if (stop > 0)
fprintf(stderr, obj->isNative() ? "reserved slots:\n" : "slots:\n");
for (unsigned i = 0; i < stop; i++) {
fprintf(stderr, " %3d ", i);
if (i < reservedEnd)
fprintf(stderr, "(reserved) ");
fprintf(stderr, "= ");
dumpValue(obj->getSlot(i));
fputc('\n', stderr);
}
if (obj->isNative()) {
fprintf(stderr, "properties:\n");
Vector<const Shape *, 8, SystemAllocPolicy> props;
for (Shape::Range r = obj->lastProperty()->all(); !r.empty(); r.popFront())
props.append(&r.front());
for (size_t i = props.length(); i-- != 0;)
DumpProperty(obj, *props[i]);
}
fputc('\n', stderr);
}
static void
MaybeDumpObject(const char *name, JSObject *obj)
{
if (obj) {
fprintf(stderr, " %s: ", name);
dumpValue(ObjectValue(*obj));
fputc('\n', stderr);
}
}
static void
MaybeDumpValue(const char *name, const Value &v)
{
if (!v.isNull()) {
fprintf(stderr, " %s: ", name);
dumpValue(v);
fputc('\n', stderr);
}
}
JS_FRIEND_API(void)
js_DumpStackFrame(JSContext *cx, StackFrame *start)
{
/* This should only called during live debugging. */
FrameRegsIter i(cx, StackIter::GO_THROUGH_SAVED);
if (!start) {
if (i.done()) {
fprintf(stderr, "no stack for cx = %p\n", (void*) cx);
return;
}
} else {
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) {
StackFrame *const fp = i.fp();
fprintf(stderr, "StackFrame at %p\n", (void *) fp);
if (fp->isFunctionFrame()) {
fprintf(stderr, "callee fun: ");
dumpValue(ObjectValue(fp->callee()));
} else {
fprintf(stderr, "global frame, no callee");
}
fputc('\n', stderr);
if (fp->isScriptFrame()) {
fprintf(stderr, "file %s line %u\n",
fp->script()->filename, (unsigned) fp->script()->lineno);
}
if (jsbytecode *pc = i.pc()) {
if (!fp->isScriptFrame()) {
fprintf(stderr, "*** pc && !script, skipping frame\n\n");
continue;
}
fprintf(stderr, " pc = %p\n", pc);
fprintf(stderr, " current op: %s\n", js_CodeName[*pc]);
}
Value *sp = i.sp();
fprintf(stderr, " slots: %p\n", (void *) fp->slots());
fprintf(stderr, " sp: %p = slots + %u\n", (void *) sp, (unsigned) (sp - fp->slots()));
if (sp - fp->slots() < 10000) { // sanity
for (Value *p = fp->slots(); p < sp; p++) {
fprintf(stderr, " %p: ", (void *) p);
dumpValue(*p);
fputc('\n', stderr);
}
}
if (fp->hasArgs()) {
fprintf(stderr, " actuals: %p (%u) ", (void *) fp->actualArgs(), (unsigned) fp->numActualArgs());
fprintf(stderr, " formals: %p (%u)\n", (void *) fp->formalArgs(), (unsigned) fp->numFormalArgs());
}
if (fp->hasCallObj()) {
fprintf(stderr, " has call obj: ");
dumpValue(ObjectValue(fp->callObj()));
fprintf(stderr, "\n");
}
MaybeDumpObject("argsobj", fp->maybeArgsObj());
MaybeDumpObject("blockChain", fp->maybeBlockChain());
if (!fp->isDummyFrame()) {
MaybeDumpValue("this", fp->thisValue());
fprintf(stderr, " rval: ");
dumpValue(fp->returnValue());
} else {
fprintf(stderr, "dummy frame");
}
fputc('\n', stderr);
fprintf(stderr, " flags:");
if (fp->isConstructing())
fprintf(stderr, " constructing");
if (fp->isDebuggerFrame())
fprintf(stderr, " debugger");
if (fp->isEvalFrame())
fprintf(stderr, " eval");
if (fp->isYielding())
fprintf(stderr, " yielding");
if (fp->isGeneratorFrame())
fprintf(stderr, " generator");
fputc('\n', stderr);
fprintf(stderr, " scopeChain: (JSObject *) %p\n", (void *) &fp->scopeChain());
fputc('\n', stderr);
}
}
#endif /* DEBUG */
