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pjs
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pjs/js/src/jsobj.c

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115 KiB
C
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU Public License (the "GPL"), in which case the
* provisions of the GPL are applicable instead of those above.
* If you wish to allow use of your version of this file only
* under the terms of the GPL and not to allow others to use your
* version of this file under the NPL, indicate your decision by
* deleting the provisions above and replace them with the notice
* and other provisions required by the GPL. If you do not delete
* the provisions above, a recipient may use your version of this
* file under either the NPL or the GPL.
*/
/*
* JS object implementation.
*/
#include "jsstddef.h"
#include <stdlib.h>
#include <string.h>
#include "jstypes.h"
#include "jsarena.h" /* Added by JSIFY */
#include "jsutil.h" /* Added by JSIFY */
#include "jshash.h" /* Added by JSIFY */
#include "jsdhash.h"
#include "jsprf.h"
#include "jsapi.h"
#include "jsarray.h"
#include "jsatom.h"
#include "jsbool.h"
#include "jscntxt.h"
#include "jsconfig.h"
#include "jsfun.h"
#include "jsgc.h"
#include "jsinterp.h"
#include "jslock.h"
#include "jsnum.h"
#include "jsobj.h"
#include "jsscope.h"
#include "jsscript.h"
#include "jsstr.h"
#include "jsopcode.h"
#include "jsdbgapi.h" /* whether or not JS_HAS_OBJ_WATCHPOINT */
#ifdef JS_THREADSAFE
#define NATIVE_DROP_PROPERTY js_DropProperty
extern void
js_DropProperty(JSContext *cx, JSObject *obj, JSProperty *prop);
#else
#define NATIVE_DROP_PROPERTY NULL
#endif
#ifdef XP_MAC
#pragma export on
#endif
JS_FRIEND_DATA(JSObjectOps) js_ObjectOps = {
js_NewObjectMap, js_DestroyObjectMap,
#if defined JS_THREADSAFE && defined DEBUG
_js_LookupProperty, js_DefineProperty,
#else
js_LookupProperty, js_DefineProperty,
#endif
js_GetProperty, js_SetProperty,
js_GetAttributes, js_SetAttributes,
js_DeleteProperty, js_DefaultValue,
js_Enumerate, js_CheckAccess,
NULL, NATIVE_DROP_PROPERTY,
js_Call, js_Construct,
NULL, js_HasInstance,
js_SetProtoOrParent, js_SetProtoOrParent,
js_Mark, js_Clear,
js_GetRequiredSlot, js_SetRequiredSlot
};
#ifdef XP_MAC
#pragma export off
#endif
JSClass js_ObjectClass = {
js_Object_str,
0,
JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, JS_FinalizeStub,
JSCLASS_NO_OPTIONAL_MEMBERS
};
#if JS_HAS_OBJ_PROTO_PROP
static JSBool
obj_getSlot(JSContext *cx, JSObject *obj, jsval id, jsval *vp);
static JSBool
obj_setSlot(JSContext *cx, JSObject *obj, jsval id, jsval *vp);
static JSBool
obj_getCount(JSContext *cx, JSObject *obj, jsval id, jsval *vp);
static JSPropertySpec object_props[] = {
/* These two must come first; see object_props[slot].name usage below. */
{js_proto_str, JSSLOT_PROTO, JSPROP_PERMANENT|JSPROP_SHARED,
obj_getSlot, obj_setSlot},
{js_parent_str,JSSLOT_PARENT,JSPROP_READONLY|JSPROP_PERMANENT|JSPROP_SHARED,
obj_getSlot, obj_setSlot},
{js_count_str, 0, JSPROP_PERMANENT,obj_getCount, obj_getCount},
{0,0,0,0,0}
};
/* NB: JSSLOT_PROTO and JSSLOT_PARENT are already indexes into object_props. */
#define JSSLOT_COUNT 2
static JSBool
ReportStrictSlot(JSContext *cx, uint32 slot)
{
if (slot == JSSLOT_PROTO)
return JS_TRUE;
return JS_ReportErrorFlagsAndNumber(cx,
JSREPORT_WARNING | JSREPORT_STRICT,
js_GetErrorMessage, NULL,
JSMSG_DEPRECATED_USAGE,
object_props[slot].name);
}
static JSBool
obj_getSlot(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
uint32 slot;
JSAccessMode mode;
uintN attrs;
slot = (uint32) JSVAL_TO_INT(id);
if (JS_HAS_STRICT_OPTION(cx) && !ReportStrictSlot(cx, slot))
return JS_FALSE;
if (id == INT_TO_JSVAL(JSSLOT_PROTO)) {
id = (jsid)cx->runtime->atomState.protoAtom;
mode = JSACC_PROTO;
} else {
id = (jsid)cx->runtime->atomState.parentAtom;
mode = JSACC_PARENT;
}
if (!OBJ_CHECK_ACCESS(cx, obj, id, mode, vp, &attrs))
return JS_FALSE;
*vp = OBJ_GET_SLOT(cx, obj, slot);
return JS_TRUE;
}
static JSBool
obj_setSlot(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
JSObject *pobj;
uint32 slot;
uintN attrs;
if (!JSVAL_IS_OBJECT(*vp))
return JS_TRUE;
pobj = JSVAL_TO_OBJECT(*vp);
slot = (uint32) JSVAL_TO_INT(id);
if (JS_HAS_STRICT_OPTION(cx) && !ReportStrictSlot(cx, slot))
return JS_FALSE;
/* __parent__ is readonly and permanent, only __proto__ may be set. */
if (!OBJ_CHECK_ACCESS(cx, obj, id, JSACC_PROTO | JSACC_WRITE, vp, &attrs))
return JS_FALSE;
return js_SetProtoOrParent(cx, obj, slot, pobj);
}
static JSBool
obj_getCount(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
jsval iter_state;
jsid num_properties;
JSBool ok;
if (JS_HAS_STRICT_OPTION(cx) && !ReportStrictSlot(cx, JSSLOT_COUNT))
return JS_FALSE;
/* Get the number of properties to enumerate. */
iter_state = JSVAL_NULL;
ok = OBJ_ENUMERATE(cx, obj, JSENUMERATE_INIT, &iter_state, &num_properties);
if (!ok)
goto out;
if (!JSVAL_IS_INT(num_properties)) {
JS_ASSERT(0);
*vp = JSVAL_ZERO;
goto out;
}
*vp = num_properties;
out:
if (iter_state != JSVAL_NULL)
ok = OBJ_ENUMERATE(cx, obj, JSENUMERATE_DESTROY, &iter_state, 0);
return ok;
}
#else /* !JS_HAS_OBJ_PROTO_PROP */
#define object_props NULL
#endif /* !JS_HAS_OBJ_PROTO_PROP */
JSBool
js_SetProtoOrParent(JSContext *cx, JSObject *obj, uint32 slot, JSObject *pobj)
{
JSRuntime *rt;
JSObject *obj2, *oldproto;
JSScope *scope, *newscope;
/*
* Serialize all proto and parent setting in order to detect cycles.
* We nest locks in this function, and only here, in the following orders:
*
* (1) rt->setSlotLock < pobj's scope lock;
* rt->setSlotLock < pobj's proto-or-parent's scope lock;
* rt->setSlotLock < pobj's grand-proto-or-parent's scope lock;
* etc...
* (2) rt->setSlotLock < obj's scope lock < pobj's scope lock.
*
* We avoid AB-BA deadlock by restricting obj from being on pobj's parent
* or proto chain (pobj may already be on obj's parent or proto chain; it
* could be moving up or down). We finally order obj with respect to pobj
* at the bottom of this routine (just before releasing rt->setSlotLock),
* by making pobj be obj's prototype or parent.
*
* After we have set the slot and released rt->setSlotLock, another call
* to js_SetProtoOrParent could nest locks according to the first order
* list above, but it cannot deadlock with any other thread. For there
* to be a deadlock, other parts of the engine would have to nest scope
* locks in the opposite order. XXXbe ensure they don't!
*/
rt = cx->runtime;
#ifdef JS_THREADSAFE
JS_ACQUIRE_LOCK(rt->setSlotLock);
while (rt->setSlotBusy) {
jsrefcount saveDepth;
/* Take pains to avoid nesting rt->gcLock inside rt->setSlotLock! */
JS_RELEASE_LOCK(rt->setSlotLock);
saveDepth = JS_SuspendRequest(cx);
JS_ACQUIRE_LOCK(rt->setSlotLock);
if (rt->setSlotBusy)
JS_WAIT_CONDVAR(rt->setSlotDone, JS_NO_TIMEOUT);
JS_RELEASE_LOCK(rt->setSlotLock);
JS_ResumeRequest(cx, saveDepth);
JS_ACQUIRE_LOCK(rt->setSlotLock);
}
rt->setSlotBusy = JS_TRUE;
JS_RELEASE_LOCK(rt->setSlotLock);
#define SET_SLOT_DONE(rt) \
JS_BEGIN_MACRO \
JS_ACQUIRE_LOCK((rt)->setSlotLock); \
(rt)->setSlotBusy = JS_FALSE; \
JS_NOTIFY_ALL_CONDVAR((rt)->setSlotDone); \
JS_RELEASE_LOCK((rt)->setSlotLock); \
JS_END_MACRO
#else
#define SET_SLOT_DONE(rt) /* nothing */
#endif
obj2 = pobj;
while (obj2) {
if (obj2 == obj) {
SET_SLOT_DONE(rt);
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_CYCLIC_VALUE, object_props[slot].name);
return JS_FALSE;
}
obj2 = JSVAL_TO_OBJECT(OBJ_GET_SLOT(cx, obj2, slot));
}
if (slot == JSSLOT_PROTO && OBJ_IS_NATIVE(obj)) {
/* Check to see whether obj shares its prototype's scope. */
JS_LOCK_OBJ(cx, obj);
scope = OBJ_SCOPE(obj);
oldproto = JSVAL_TO_OBJECT(LOCKED_OBJ_GET_SLOT(obj, JSSLOT_PROTO));
if (oldproto && OBJ_SCOPE(oldproto) == scope) {
/* Either obj needs a new empty scope, or it should share pobj's. */
if (!pobj ||
!OBJ_IS_NATIVE(pobj) ||
OBJ_GET_CLASS(cx, pobj) != LOCKED_OBJ_GET_CLASS(oldproto)) {
/*
* With no proto and no scope of its own, obj is truly empty.
*
* If pobj is not native, obj needs its own empty scope -- it
* should not continue to share oldproto's scope once oldproto
* is not on obj's prototype chain. That would put properties
* from oldproto's scope ahead of properties defined by pobj,
* in lookup order.
*
* If pobj's class differs from oldproto's, we may need a new
* scope to handle differences in private and reserved slots,
* so we suboptimally but safely make one.
*/
scope = js_GetMutableScope(cx, obj);
if (!scope) {
JS_UNLOCK_OBJ(cx, obj);
SET_SLOT_DONE(rt);
return JS_FALSE;
}
} else if (OBJ_SCOPE(pobj) != scope) {
#ifdef JS_THREADSAFE
/*
* We are about to nest scope locks. Help jslock.c:ShareScope
* keep scope->u.count balanced for the JS_UNLOCK_SCOPE, while
* avoiding deadlock, by recording scope in rt->setSlotScope.
*/
if (scope->ownercx) {
JS_ASSERT(scope->ownercx == cx);
rt->setSlotScope = scope;
}
#endif
/* We can't deadlock because we checked for cycles above (2). */
JS_LOCK_OBJ(cx, pobj);
newscope = (JSScope *) js_HoldObjectMap(cx, pobj->map);
obj->map = &newscope->map;
js_DropObjectMap(cx, &scope->map, obj);
JS_TRANSFER_SCOPE_LOCK(cx, scope, newscope);
scope = newscope;
#ifdef JS_THREADSAFE
rt->setSlotScope = NULL;
#endif
}
}
LOCKED_OBJ_SET_SLOT(obj, JSSLOT_PROTO, OBJECT_TO_JSVAL(pobj));
JS_UNLOCK_SCOPE(cx, scope);
} else {
OBJ_SET_SLOT(cx, obj, slot, OBJECT_TO_JSVAL(pobj));
}
SET_SLOT_DONE(rt);
return JS_TRUE;
#undef SET_SLOT_DONE
}
JS_STATIC_DLL_CALLBACK(JSHashNumber)
js_hash_object(const void *key)
{
return (JSHashNumber)key >> JSVAL_TAGBITS;
}
static JSHashEntry *
MarkSharpObjects(JSContext *cx, JSObject *obj, JSIdArray **idap)
{
JSSharpObjectMap *map;
JSHashTable *table;
JSHashNumber hash;
JSHashEntry **hep, *he;
jsatomid sharpid;
JSIdArray *ida;
JSBool ok;
jsint i, length;
jsid id;
#if JS_HAS_GETTER_SETTER
JSObject *obj2;
JSProperty *prop;
uintN attrs;
#endif
jsval val;
map = &cx->sharpObjectMap;
table = map->table;
hash = js_hash_object(obj);
hep = JS_HashTableRawLookup(table, hash, obj);
he = *hep;
if (!he) {
sharpid = 0;
he = JS_HashTableRawAdd(table, hep, hash, obj, (void *)sharpid);
if (!he) {
JS_ReportOutOfMemory(cx);
return NULL;
}
ida = JS_Enumerate(cx, obj);
if (!ida)
return NULL;
ok = JS_TRUE;
for (i = 0, length = ida->length; i < length; i++) {
id = ida->vector[i];
#if JS_HAS_GETTER_SETTER
ok = OBJ_LOOKUP_PROPERTY(cx, obj, id, &obj2, &prop);
if (!ok)
break;
if (prop) {
ok = OBJ_GET_ATTRIBUTES(cx, obj2, id, prop, &attrs);
if (ok) {
if (OBJ_IS_NATIVE(obj2) &&
(attrs & (JSPROP_GETTER | JSPROP_SETTER))) {
val = JSVAL_NULL;
if (attrs & JSPROP_GETTER)
val = (jsval) ((JSScopeProperty*)prop)->getter;
if (attrs & JSPROP_SETTER) {
if (val != JSVAL_NULL) {
/* Mark the getter, then set val to setter. */
ok = (MarkSharpObjects(cx, JSVAL_TO_OBJECT(val),
NULL)
!= NULL);
}
val = (jsval) ((JSScopeProperty*)prop)->setter;
}
} else {
ok = OBJ_GET_PROPERTY(cx, obj, id, &val);
}
}
OBJ_DROP_PROPERTY(cx, obj2, prop);
}
#else
ok = OBJ_GET_PROPERTY(cx, obj, id, &val);
#endif
if (!ok)
break;
if (!JSVAL_IS_PRIMITIVE(val) &&
!MarkSharpObjects(cx, JSVAL_TO_OBJECT(val), NULL)) {
ok = JS_FALSE;
break;
}
}
if (!ok || !idap)
JS_DestroyIdArray(cx, ida);
if (!ok)
return NULL;
} else {
sharpid = (jsatomid) he->value;
if (sharpid == 0) {
sharpid = ++map->sharpgen << SHARP_ID_SHIFT;
he->value = (void *) sharpid;
}
ida = NULL;
}
if (idap)
*idap = ida;
return he;
}
JSHashEntry *
js_EnterSharpObject(JSContext *cx, JSObject *obj, JSIdArray **idap,
jschar **sp)
{
JSSharpObjectMap *map;
JSHashTable *table;
JSIdArray *ida;
JSHashNumber hash;
JSHashEntry *he, **hep;
jsatomid sharpid;
char buf[20];
size_t len;
/* Set to null in case we return an early error. */
*sp = NULL;
map = &cx->sharpObjectMap;
table = map->table;
if (!table) {
table = JS_NewHashTable(8, js_hash_object, JS_CompareValues,
JS_CompareValues, NULL, NULL);
if (!table) {
JS_ReportOutOfMemory(cx);
return NULL;
}
map->table = table;
}
ida = NULL;
if (map->depth == 0) {
he = MarkSharpObjects(cx, obj, &ida);
if (!he)
goto bad;
JS_ASSERT((((jsatomid) he->value) & SHARP_BIT) == 0);
if (!idap) {
JS_DestroyIdArray(cx, ida);
ida = NULL;
}
} else {
hash = js_hash_object(obj);
hep = JS_HashTableRawLookup(table, hash, obj);
he = *hep;
/*
* It's possible that the value of a property has changed from the
* first time the object's properties are traversed (when the property
* ids are entered into the hash table) to the second (when they are
* converted to strings), i.e., the OBJ_GET_PROPERTY() call is not
* idempotent.
*/
if (!he) {
he = JS_HashTableRawAdd(table, hep, hash, obj, NULL);
if (!he) {
JS_ReportOutOfMemory(cx);
goto bad;
}
*sp = NULL;
sharpid = 0;
goto out;
}
}
sharpid = (jsatomid) he->value;
if (sharpid == 0) {
*sp = NULL;
} else {
len = JS_snprintf(buf, sizeof buf, "#%u%c",
sharpid >> SHARP_ID_SHIFT,
(sharpid & SHARP_BIT) ? '#' : '=');
*sp = js_InflateString(cx, buf, len);
if (!*sp) {
if (ida)
JS_DestroyIdArray(cx, ida);
goto bad;
}
}
out:
JS_ASSERT(he);
if ((sharpid & SHARP_BIT) == 0) {
if (idap && !ida) {
ida = JS_Enumerate(cx, obj);
if (!ida) {
if (*sp) {
JS_free(cx, *sp);
*sp = NULL;
}
goto bad;
}
}
map->depth++;
}
if (idap)
*idap = ida;
return he;
bad:
/* Clean up the sharpObjectMap table on outermost error. */
if (map->depth == 0) {
map->sharpgen = 0;
JS_HashTableDestroy(map->table);
map->table = NULL;
}
return NULL;
}
void
js_LeaveSharpObject(JSContext *cx, JSIdArray **idap)
{
JSSharpObjectMap *map;
JSIdArray *ida;
map = &cx->sharpObjectMap;
JS_ASSERT(map->depth > 0);
if (--map->depth == 0) {
map->sharpgen = 0;
JS_HashTableDestroy(map->table);
map->table = NULL;
}
if (idap) {
ida = *idap;
if (ida) {
JS_DestroyIdArray(cx, ida);
*idap = NULL;
}
}
}
#define OBJ_TOSTRING_EXTRA 3 /* for 3 local GC roots */
#if JS_HAS_INITIALIZERS || JS_HAS_TOSOURCE
JSBool
js_obj_toSource(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
JSBool ok, outermost;
JSHashEntry *he;
JSIdArray *ida;
jschar *chars, *ochars, *vsharp;
const jschar *idstrchars, *vchars;
size_t nchars, idstrlength, gsoplength, vlength, vsharplength;
char *comma;
jsint i, j, length, valcnt;
jsid id;
#if JS_HAS_GETTER_SETTER
JSObject *obj2;
JSProperty *prop;
uintN attrs;
#endif
jsval val[2];
JSString *gsop[2];
JSAtom *atom;
JSString *idstr, *valstr, *str;
/*
* obj_toString for 1.2 calls toSource, and doesn't want the extra parens
* on the outside.
*/
outermost = (cx->version != JSVERSION_1_2 && cx->sharpObjectMap.depth == 0);
he = js_EnterSharpObject(cx, obj, &ida, &chars);
if (!he)
return JS_FALSE;
if (IS_SHARP(he)) {
/*
* We didn't enter -- obj is already "sharp", meaning we've visited it
* already in our depth first search, and therefore chars contains a
* string of the form "#n#".
*/
JS_ASSERT(!ida);
#if JS_HAS_SHARP_VARS
nchars = js_strlen(chars);
#else
chars[0] = '{';
chars[1] = '}';
chars[2] = 0;
nchars = 2;
#endif
goto make_string;
}
JS_ASSERT(ida);
ok = JS_TRUE;
if (!chars) {
/* If outermost, allocate 4 + 1 for "({})" and the terminator. */
chars = (jschar *) malloc(((outermost ? 4 : 2) + 1) * sizeof(jschar));
nchars = 0;
if (!chars)
goto error;
if (outermost)
chars[nchars++] = '(';
} else {
/* js_EnterSharpObject returned a string of the form "#n=" in chars. */
MAKE_SHARP(he);
nchars = js_strlen(chars);
chars = (jschar *)
realloc((ochars = chars), (nchars + 2 + 1) * sizeof(jschar));
if (!chars) {
free(ochars);
goto error;
}
if (outermost) {
/*
* No need for parentheses around the whole shebang, because #n=
* unambiguously begins an object initializer, and never a block
* statement.
*/
outermost = JS_FALSE;
}
}
chars[nchars++] = '{';
comma = NULL;
for (i = 0, length = ida->length; i < length; i++) {
/* Get strings for id and value and GC-root them via argv. */
id = ida->vector[i];
#if JS_HAS_GETTER_SETTER
ok = OBJ_LOOKUP_PROPERTY(cx, obj, id, &obj2, &prop);
if (!ok)
goto error;
valcnt = 0;
if (prop) {
ok = OBJ_GET_ATTRIBUTES(cx, obj2, id, prop, &attrs);
if (!ok) {
OBJ_DROP_PROPERTY(cx, obj2, prop);
goto error;
}
if (OBJ_IS_NATIVE(obj2) &&
(attrs & (JSPROP_GETTER | JSPROP_SETTER))) {
if (attrs & JSPROP_GETTER) {
val[valcnt] = (jsval) ((JSScopeProperty *)prop)->getter;
#ifdef OLD_GETTER_SETTER
gsop[valcnt] =
ATOM_TO_STRING(cx->runtime->atomState.getterAtom);
#else
gsop[valcnt] =
ATOM_TO_STRING(cx->runtime->atomState.getAtom);
#endif
valcnt++;
}
if (attrs & JSPROP_SETTER) {
val[valcnt] = (jsval) ((JSScopeProperty *)prop)->setter;
#ifdef OLD_GETTER_SETTER
gsop[valcnt] =
ATOM_TO_STRING(cx->runtime->atomState.setterAtom);
#else
gsop[valcnt] =
ATOM_TO_STRING(cx->runtime->atomState.setAtom);
#endif
valcnt++;
}
} else {
valcnt = 1;
gsop[0] = NULL;
ok = OBJ_GET_PROPERTY(cx, obj, id, &val[0]);
}
OBJ_DROP_PROPERTY(cx, obj2, prop);
}
#else /* !JS_HAS_GETTER_SETTER */
valcnt = 1;
gsop[0] = NULL;
ok = OBJ_GET_PROPERTY(cx, obj, id, &val[0]);
#endif /* !JS_HAS_GETTER_SETTER */
if (!ok)
goto error;
/* Convert id to a jsval and then to a string. */
atom = JSVAL_IS_INT(id) ? NULL : (JSAtom *)id;
id = ID_TO_VALUE(id);
idstr = js_ValueToString(cx, id);
if (!idstr) {
ok = JS_FALSE;
goto error;
}
argv[0] = STRING_TO_JSVAL(idstr);
/*
* If id is a string that's a reserved identifier, or else id is not
* an identifier at all, then it needs to be quoted.
*/
if (atom && (ATOM_KEYWORD(atom) || !js_IsIdentifier(idstr))) {
idstr = js_QuoteString(cx, idstr, (jschar)'\'');
if (!idstr) {
ok = JS_FALSE;
goto error;
}
argv[0] = STRING_TO_JSVAL(idstr);
}
idstrchars = JSSTRING_CHARS(idstr);
idstrlength = JSSTRING_LENGTH(idstr);
for (j = 0; j < valcnt; j++) {
/* Convert val[j] to its canonical source form. */
valstr = js_ValueToSource(cx, val[j]);
if (!valstr) {
ok = JS_FALSE;
goto error;
}
argv[1+j] = STRING_TO_JSVAL(valstr);
vchars = JSSTRING_CHARS(valstr);
vlength = JSSTRING_LENGTH(valstr);
#ifndef OLD_GETTER_SETTER
/* Remove 'function ' from beginning of valstr. */
if (gsop[j]) {
int n = strlen(js_function_str) + 1;
vchars += n;
vlength -= n;
}
#endif
/* If val[j] is a non-sharp object, consider sharpening it. */
vsharp = NULL;
vsharplength = 0;
#if JS_HAS_SHARP_VARS
if (!JSVAL_IS_PRIMITIVE(val[j]) && vchars[0] != '#') {
he = js_EnterSharpObject(cx, JSVAL_TO_OBJECT(val[j]), NULL,
&vsharp);
if (!he) {
ok = JS_FALSE;
goto error;
}
if (IS_SHARP(he)) {
vchars = vsharp;
vlength = js_strlen(vchars);
} else {
if (vsharp) {
vsharplength = js_strlen(vsharp);
MAKE_SHARP(he);
}
js_LeaveSharpObject(cx, NULL);
}
}
#endif
/* Allocate 1 + 1 at end for closing brace and terminating 0. */
chars = (jschar *)
realloc((ochars = chars),
(nchars + (comma ? 2 : 0) +
idstrlength + 1 +
(gsop[j] ? 1 + JSSTRING_LENGTH(gsop[j]) : 0) +
vsharplength + vlength +
(outermost ? 2 : 1) + 1) * sizeof(jschar));
if (!chars) {
/* Save code space on error: let JS_free ignore null vsharp. */
JS_free(cx, vsharp);
free(ochars);
goto error;
}
if (comma) {
chars[nchars++] = comma[0];
chars[nchars++] = comma[1];
}
comma = ", ";
#ifdef OLD_GETTER_SETTER
js_strncpy(&chars[nchars], idstrchars, idstrlength);
nchars += idstrlength;
if (gsop[j]) {
chars[nchars++] = ' ';
gsoplength = JSSTRING_LENGTH(gsop[j]);
js_strncpy(&chars[nchars], JSSTRING_CHARS(gsop[j]), gsoplength);
nchars += gsoplength;
}
chars[nchars++] = ':';
#else
if (gsop[j]) {
gsoplength = JSSTRING_LENGTH(gsop[j]);
js_strncpy(&chars[nchars], JSSTRING_CHARS(gsop[j]), gsoplength);
nchars += gsoplength;
chars[nchars++] = ' ';
}
js_strncpy(&chars[nchars], idstrchars, idstrlength);
nchars += idstrlength;
if (!gsop[j])
chars[nchars++] = ':';
#endif
if (vsharplength) {
js_strncpy(&chars[nchars], vsharp, vsharplength);
nchars += vsharplength;
}
js_strncpy(&chars[nchars], vchars, vlength);
nchars += vlength;
if (vsharp)
JS_free(cx, vsharp);
}
}
chars[nchars++] = '}';
if (outermost)
chars[nchars++] = ')';
chars[nchars] = 0;
error:
js_LeaveSharpObject(cx, &ida);
if (!ok) {
if (chars)
free(chars);
return ok;
}
if (!chars) {
JS_ReportOutOfMemory(cx);
return JS_FALSE;
}
make_string:
str = js_NewString(cx, chars, nchars, 0);
if (!str) {
free(chars);
return JS_FALSE;
}
*rval = STRING_TO_JSVAL(str);
return JS_TRUE;
}
#endif /* JS_HAS_INITIALIZERS || JS_HAS_TOSOURCE */
JSBool
js_obj_toString(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
jschar *chars;
size_t nchars;
const char *clazz, *prefix;
JSString *str;
#if JS_HAS_INITIALIZERS
if (cx->version == JSVERSION_1_2)
return js_obj_toSource(cx, obj, argc, argv, rval);
#endif
clazz = OBJ_GET_CLASS(cx, obj)->name;
nchars = 9 + strlen(clazz); /* 9 for "[object ]" */
chars = (jschar *) JS_malloc(cx, (nchars + 1) * sizeof(jschar));
if (!chars)
return JS_FALSE;
prefix = "[object ";
nchars = 0;
while ((chars[nchars] = (jschar)*prefix) != 0)
nchars++, prefix++;
while ((chars[nchars] = (jschar)*clazz) != 0)
nchars++, clazz++;
chars[nchars++] = ']';
chars[nchars] = 0;
str = js_NewString(cx, chars, nchars, 0);
if (!str) {
JS_free(cx, chars);
return JS_FALSE;
}
*rval = STRING_TO_JSVAL(str);
return JS_TRUE;
}
static JSBool
obj_valueOf(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
*rval = OBJECT_TO_JSVAL(obj);
return JS_TRUE;
}
static JSBool
obj_eval(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
JSStackFrame *fp, *caller;
JSBool indirectCall;
JSObject *scopeobj;
JSString *str;
const char *file;
uintN line;
JSPrincipals *principals;
JSScript *script;
JSBool ok;
#if JS_HAS_EVAL_THIS_SCOPE
JSObject *callerScopeChain = NULL, *callerVarObj = NULL;
JSBool setCallerScopeChain = JS_FALSE, setCallerVarObj = JS_FALSE;
#endif
fp = cx->fp;
caller = fp->down;
indirectCall = (!caller->pc || *caller->pc != JSOP_EVAL);
if (JSVERSION_IS_ECMA(cx->version) &&
indirectCall &&
!JS_ReportErrorFlagsAndNumber(cx,
JSREPORT_WARNING | JSREPORT_STRICT,
js_GetErrorMessage, NULL,
JSMSG_BAD_INDIRECT_CALL,
js_eval_str)) {
return JS_FALSE;
}
if (!JSVAL_IS_STRING(argv[0])) {
*rval = argv[0];
return JS_TRUE;
}
#if JS_HAS_SCRIPT_OBJECT
/*
* Script.prototype.compile/exec and Object.prototype.eval all take an
* optional trailing argument that overrides the scope object.
*/
scopeobj = NULL;
if (argc >= 2) {
if (!js_ValueToObject(cx, argv[1], &scopeobj))
return JS_FALSE;
argv[1] = OBJECT_TO_JSVAL(scopeobj);
}
if (!scopeobj)
#endif
{
#if JS_HAS_EVAL_THIS_SCOPE
/* If obj.eval(str), emulate 'with (obj) eval(str)' in the caller. */
if (indirectCall) {
callerScopeChain = caller->scopeChain;
if (obj != callerScopeChain) {
scopeobj = js_NewObject(cx, &js_WithClass, obj,
callerScopeChain);
if (!scopeobj)
return JS_FALSE;
/* Set fp->scopeChain too, for the compiler. */
caller->scopeChain = fp->scopeChain = scopeobj;
setCallerScopeChain = JS_TRUE;
}
callerVarObj = caller->varobj;
if (obj != callerVarObj) {
/* Set fp->varobj too, for the compiler. */
caller->varobj = fp->varobj = obj;
setCallerVarObj = JS_TRUE;
}
}
/* From here on, control must exit through label out with ok set. */
#endif
#if JS_BUG_EVAL_THIS_SCOPE
/* An old version used the object in which eval was found for scope. */
scopeobj = obj;
#else
/* Compile using caller's current scope object. */
scopeobj = caller->scopeChain;
#endif
}
str = JSVAL_TO_STRING(argv[0]);
if (caller->script) {
file = caller->script->filename;
line = js_PCToLineNumber(caller->script, caller->pc);
principals = caller->script->principals;
} else {
file = NULL;
line = 0;
principals = NULL;
}
fp->flags |= JSFRAME_EVAL;
script = JS_CompileUCScriptForPrincipals(cx, scopeobj, principals,
JSSTRING_CHARS(str),
JSSTRING_LENGTH(str),
file, line);
if (!script) {
ok = JS_FALSE;
goto out;
}
#if !JS_BUG_EVAL_THIS_SCOPE
#if JS_HAS_SCRIPT_OBJECT
if (argc < 2)
#endif
{
/* Execute using caller's new scope object (might be a Call object). */
scopeobj = caller->scopeChain;
}
#endif
ok = js_Execute(cx, scopeobj, script, caller, JSFRAME_EVAL, rval);
JS_DestroyScript(cx, script);
out:
#if JS_HAS_EVAL_THIS_SCOPE
/* Restore OBJ_GET_PARENT(scopeobj) not callerScopeChain in case of Call. */
if (setCallerScopeChain)
caller->scopeChain = callerScopeChain;
if (setCallerVarObj)
caller->varobj = callerVarObj;
#endif
return ok;
}
#if JS_HAS_OBJ_WATCHPOINT
static JSBool
obj_watch_handler(JSContext *cx, JSObject *obj, jsval id, jsval old, jsval *nvp,
void *closure)
{
JSObject *funobj;
jsval argv[3];
funobj = (JSObject *) closure;
argv[0] = id;
argv[1] = old;
argv[2] = *nvp;
return js_InternalCall(cx, obj, OBJECT_TO_JSVAL(funobj), 3, argv, nvp);
}
static JSBool
obj_watch(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
JSFunction *fun;
jsval userid, value;
jsid propid;
uintN attrs;
fun = js_ValueToFunction(cx, &argv[1], JS_FALSE);
if (!fun)
return JS_FALSE;
argv[1] = OBJECT_TO_JSVAL(fun->object);
/* Compute the unique int/atom symbol id needed by js_LookupProperty. */
userid = argv[0];
if (!JS_ValueToId(cx, userid, &propid))
return JS_FALSE;
if (!OBJ_CHECK_ACCESS(cx, obj, propid, JSACC_WATCH, &value, &attrs))
return JS_FALSE;
if (attrs & JSPROP_READONLY)
return JS_TRUE;
return JS_SetWatchPoint(cx, obj, userid, obj_watch_handler, fun->object);
}
static JSBool
obj_unwatch(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
return JS_ClearWatchPoint(cx, obj, argv[0], NULL, NULL);
}
#endif /* JS_HAS_OBJ_WATCHPOINT */
#if JS_HAS_NEW_OBJ_METHODS
/*
* Prototype and property query methods, to complement the 'in' and
* 'instanceof' operators.
*/
/* Proposed ECMA 15.2.4.5. */
static JSBool
obj_hasOwnProperty(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
jsid id;
JSObject *obj2;
JSProperty *prop;
JSScopeProperty *sprop;
JSBool sharedPermanent;
if (!JS_ValueToId(cx, argv[0], &id))
return JS_FALSE;
if (!OBJ_LOOKUP_PROPERTY(cx, obj, id, &obj2, &prop))
return JS_FALSE;
if (!prop) {
*rval = JSVAL_FALSE;
} else if (obj2 == obj) {
*rval = JSVAL_TRUE;
} else if (OBJ_IS_NATIVE(obj2)) {
sprop = (JSScopeProperty *)prop;
sharedPermanent =
(~sprop->attrs & (JSPROP_SHARED | JSPROP_PERMANENT)) == 0;
*rval = BOOLEAN_TO_JSVAL(sharedPermanent);
} else {
*rval = JSVAL_FALSE;
}
if (prop)
OBJ_DROP_PROPERTY(cx, obj2, prop);
return JS_TRUE;
}
/* Proposed ECMA 15.2.4.6. */
static JSBool
obj_isPrototypeOf(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
JSBool b;
if (!js_IsDelegate(cx, obj, *argv, &b))
return JS_FALSE;
*rval = BOOLEAN_TO_JSVAL(b);
return JS_TRUE;
}
/* Proposed ECMA 15.2.4.7. */
static JSBool
obj_propertyIsEnumerable(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
jsid id;
uintN attrs;
JSObject *obj2;
JSProperty *prop;
JSBool ok;
if (!JS_ValueToId(cx, argv[0], &id))
return JS_FALSE;
if (!OBJ_LOOKUP_PROPERTY(cx, obj, id, &obj2, &prop))
return JS_FALSE;
/* XXX ECMA spec error compatible: return false unless hasOwnProperty. */
if (prop && obj2 != obj) {
OBJ_DROP_PROPERTY(cx, obj2, prop);
*rval = JSVAL_FALSE;
return JS_TRUE;
}
ok = OBJ_GET_ATTRIBUTES(cx, obj, id, prop, &attrs);
OBJ_DROP_PROPERTY(cx, obj2, prop);
if (ok)
*rval = BOOLEAN_TO_JSVAL((attrs & JSPROP_ENUMERATE) != 0);
return ok;
}
#endif /* JS_HAS_NEW_OBJ_METHODS */
#if JS_HAS_GETTER_SETTER
static JSBool
obj_defineGetter(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
jsval fval, junk;
jsid id;
JSBool found;
uintN attrs;
fval = argv[1];
if (JS_TypeOfValue(cx, fval) != JSTYPE_FUNCTION) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_BAD_GETTER_OR_SETTER,
js_getter_str);
return JS_FALSE;
}
if (!JS_ValueToId(cx, argv[0], &id))
return JS_FALSE;
if (!js_CheckRedeclaration(cx, obj, id, JSPROP_GETTER, &found))
return JS_FALSE;
/*
* Getters and setters are just like watchpoints from an access
* control point of view.
*/
if (!OBJ_CHECK_ACCESS(cx, obj, id, JSACC_WATCH, &junk, &attrs))
return JS_FALSE;
return OBJ_DEFINE_PROPERTY(cx, obj, id, JSVAL_VOID,
(JSPropertyOp) JSVAL_TO_OBJECT(fval), NULL,
JSPROP_GETTER | JSPROP_SHARED, NULL);
}
static JSBool
obj_defineSetter(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
jsval fval, junk;
jsid id;
JSBool found;
uintN attrs;
fval = argv[1];
if (JS_TypeOfValue(cx, fval) != JSTYPE_FUNCTION) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_BAD_GETTER_OR_SETTER,
js_setter_str);
return JS_FALSE;
}
if (!JS_ValueToId(cx, argv[0], &id))
return JS_FALSE;
if (!js_CheckRedeclaration(cx, obj, id, JSPROP_SETTER, &found))
return JS_FALSE;
/*
* Getters and setters are just like watchpoints from an access
* control point of view.
*/
if (!OBJ_CHECK_ACCESS(cx, obj, id, JSACC_WATCH, &junk, &attrs))
return JS_FALSE;
return OBJ_DEFINE_PROPERTY(cx, obj, id, JSVAL_VOID,
NULL, (JSPropertyOp) JSVAL_TO_OBJECT(fval),
JSPROP_SETTER | JSPROP_SHARED, NULL);
}
static JSBool
obj_lookupGetter(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
jsid id;
JSObject *pobj;
JSScopeProperty *sprop;
if (!JS_ValueToId(cx, argv[0], &id))
return JS_FALSE;
if (!OBJ_LOOKUP_PROPERTY(cx, obj, id, &pobj, (JSProperty **) &sprop))
return JS_FALSE;
if (sprop) {
if (sprop->attrs & JSPROP_GETTER)
*rval = OBJECT_TO_JSVAL(sprop->getter);
OBJ_DROP_PROPERTY(cx, pobj, (JSProperty *)sprop);
}
return JS_TRUE;
}
static JSBool
obj_lookupSetter(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
jsid id;
JSObject *pobj;
JSScopeProperty *sprop;
if (!JS_ValueToId(cx, argv[0], &id))
return JS_FALSE;
if (!OBJ_LOOKUP_PROPERTY(cx, obj, id, &pobj, (JSProperty **) &sprop))
return JS_FALSE;
if (sprop) {
if (sprop->attrs & JSPROP_SETTER)
*rval = OBJECT_TO_JSVAL(sprop->setter);
OBJ_DROP_PROPERTY(cx, pobj, (JSProperty *)sprop);
}
return JS_TRUE;
}
#endif /* JS_HAS_GETTER_SETTER */
#if JS_HAS_OBJ_WATCHPOINT
const char js_watch_str[] = "watch";
const char js_unwatch_str[] = "unwatch";
#endif
#if JS_HAS_NEW_OBJ_METHODS
const char js_hasOwnProperty_str[] = "hasOwnProperty";
const char js_isPrototypeOf_str[] = "isPrototypeOf";
const char js_propertyIsEnumerable_str[] = "propertyIsEnumerable";
#endif
#if JS_HAS_GETTER_SETTER
const char js_defineGetter_str[] = "__defineGetter__";
const char js_defineSetter_str[] = "__defineSetter__";
const char js_lookupGetter_str[] = "__lookupGetter__";
const char js_lookupSetter_str[] = "__lookupSetter__";
#endif
static JSFunctionSpec object_methods[] = {
#if JS_HAS_TOSOURCE
{js_toSource_str, js_obj_toSource, 0, 0, OBJ_TOSTRING_EXTRA},
#endif
{js_toString_str, js_obj_toString, 0, 0, OBJ_TOSTRING_EXTRA},
{js_toLocaleString_str, js_obj_toString, 0, 0, OBJ_TOSTRING_EXTRA},
{js_valueOf_str, obj_valueOf, 0,0,0},
{js_eval_str, obj_eval, 1,0,0},
#if JS_HAS_OBJ_WATCHPOINT
{js_watch_str, obj_watch, 2,0,0},
{js_unwatch_str, obj_unwatch, 1,0,0},
#endif
#if JS_HAS_NEW_OBJ_METHODS
{js_hasOwnProperty_str, obj_hasOwnProperty, 1,0,0},
{js_isPrototypeOf_str, obj_isPrototypeOf, 1,0,0},
{js_propertyIsEnumerable_str, obj_propertyIsEnumerable, 1,0,0},
#endif
#if JS_HAS_GETTER_SETTER
{js_defineGetter_str, obj_defineGetter, 2,0,0},
{js_defineSetter_str, obj_defineSetter, 2,0,0},
{js_lookupGetter_str, obj_lookupGetter, 1,0,0},
{js_lookupSetter_str, obj_lookupSetter, 1,0,0},
#endif
{0,0,0,0,0}
};
static JSBool
Object(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
if (argc == 0) {
/* Trigger logic below to construct a blank object. */
obj = NULL;
} else {
/* If argv[0] is null or undefined, obj comes back null. */
if (!js_ValueToObject(cx, argv[0], &obj))
return JS_FALSE;
}
if (!obj) {
JS_ASSERT(!argc || JSVAL_IS_NULL(argv[0]) || JSVAL_IS_VOID(argv[0]));
if (cx->fp->flags & JSFRAME_CONSTRUCTING)
return JS_TRUE;
obj = js_NewObject(cx, &js_ObjectClass, NULL, NULL);
if (!obj)
return JS_FALSE;
}
*rval = OBJECT_TO_JSVAL(obj);
return JS_TRUE;
}
/*
* ObjectOps and Class for with-statement stack objects.
*/
static JSBool
with_LookupProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
JSProperty **propp
#if defined JS_THREADSAFE && defined DEBUG
, const char *file, uintN line
#endif
)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_LookupProperty(cx, obj, id, objp, propp);
return OBJ_LOOKUP_PROPERTY(cx, proto, id, objp, propp);
}
static JSBool
with_GetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_GetProperty(cx, obj, id, vp);
return OBJ_GET_PROPERTY(cx, proto, id, vp);
}
static JSBool
with_SetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_SetProperty(cx, obj, id, vp);
return OBJ_SET_PROPERTY(cx, proto, id, vp);
}
static JSBool
with_GetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop,
uintN *attrsp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_GetAttributes(cx, obj, id, prop, attrsp);
return OBJ_GET_ATTRIBUTES(cx, proto, id, prop, attrsp);
}
static JSBool
with_SetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop,
uintN *attrsp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_SetAttributes(cx, obj, id, prop, attrsp);
return OBJ_SET_ATTRIBUTES(cx, proto, id, prop, attrsp);
}
static JSBool
with_DeleteProperty(JSContext *cx, JSObject *obj, jsid id, jsval *rval)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_DeleteProperty(cx, obj, id, rval);
return OBJ_DELETE_PROPERTY(cx, proto, id, rval);
}
static JSBool
with_DefaultValue(JSContext *cx, JSObject *obj, JSType hint, jsval *vp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_DefaultValue(cx, obj, hint, vp);
return OBJ_DEFAULT_VALUE(cx, proto, hint, vp);
}
static JSBool
with_Enumerate(JSContext *cx, JSObject *obj, JSIterateOp enum_op,
jsval *statep, jsid *idp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_Enumerate(cx, obj, enum_op, statep, idp);
return OBJ_ENUMERATE(cx, proto, enum_op, statep, idp);
}
static JSBool
with_CheckAccess(JSContext *cx, JSObject *obj, jsid id, JSAccessMode mode,
jsval *vp, uintN *attrsp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_CheckAccess(cx, obj, id, mode, vp, attrsp);
return OBJ_CHECK_ACCESS(cx, proto, id, mode, vp, attrsp);
}
static JSObject *
with_ThisObject(JSContext *cx, JSObject *obj)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return obj;
return OBJ_THIS_OBJECT(cx, proto);
}
JS_FRIEND_DATA(JSObjectOps) js_WithObjectOps = {
js_NewObjectMap, js_DestroyObjectMap,
with_LookupProperty, js_DefineProperty,
with_GetProperty, with_SetProperty,
with_GetAttributes, with_SetAttributes,
with_DeleteProperty, with_DefaultValue,
with_Enumerate, with_CheckAccess,
with_ThisObject, NATIVE_DROP_PROPERTY,
NULL, NULL,
NULL, NULL,
js_SetProtoOrParent, js_SetProtoOrParent,
js_Mark, js_Clear,
NULL, NULL
};
static JSObjectOps *
with_getObjectOps(JSContext *cx, JSClass *clasp)
{
return &js_WithObjectOps;
}
JSClass js_WithClass = {
"With",
0,
JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, JS_FinalizeStub,
with_getObjectOps,
0,0,0,0,0,0,0
};
#if JS_HAS_OBJ_PROTO_PROP
static JSBool
With(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
JSObject *parent, *proto;
jsval v;
if (!JS_ReportErrorFlagsAndNumber(cx,
JSREPORT_WARNING | JSREPORT_STRICT,
js_GetErrorMessage, NULL,
JSMSG_DEPRECATED_USAGE,
js_WithClass.name)) {
return JS_FALSE;
}
if (!(cx->fp->flags & JSFRAME_CONSTRUCTING)) {
obj = js_NewObject(cx, &js_WithClass, NULL, NULL);
if (!obj)
return JS_FALSE;
*rval = OBJECT_TO_JSVAL(obj);
}
parent = cx->fp->scopeChain;
if (argc > 0) {
if (!js_ValueToObject(cx, argv[0], &proto))
return JS_FALSE;
v = OBJECT_TO_JSVAL(proto);
if (!obj_setSlot(cx, obj, INT_TO_JSVAL(JSSLOT_PROTO), &v))
return JS_FALSE;
if (argc > 1) {
if (!js_ValueToObject(cx, argv[1], &parent))
return JS_FALSE;
}
}
v = OBJECT_TO_JSVAL(parent);
return obj_setSlot(cx, obj, INT_TO_JSVAL(JSSLOT_PARENT), &v);
}
#endif
JSObject *
js_InitObjectClass(JSContext *cx, JSObject *obj)
{
JSObject *proto;
jsval eval;
#if JS_HAS_SHARP_VARS
JS_ASSERT(sizeof(jsatomid) * JS_BITS_PER_BYTE >= ATOM_INDEX_LIMIT_LOG2 + 1);
#endif
proto = JS_InitClass(cx, obj, NULL, &js_ObjectClass, Object, 1,
object_props, object_methods, NULL, NULL);
if (!proto)
return NULL;
#if JS_HAS_OBJ_PROTO_PROP
if (!JS_InitClass(cx, obj, NULL, &js_WithClass, With, 0,
NULL, NULL, NULL, NULL)) {
return NULL;
}
#endif
/* ECMA (15.1.2.1) says 'eval' is also a property of the global object. */
if (!OBJ_GET_PROPERTY(cx, proto, (jsid)cx->runtime->atomState.evalAtom,
&eval)) {
return NULL;
}
if (!OBJ_DEFINE_PROPERTY(cx, obj, (jsid)cx->runtime->atomState.evalAtom,
eval, NULL, NULL, 0, NULL)) {
return NULL;
}
return proto;
}
void
js_InitObjectMap(JSObjectMap *map, jsrefcount nrefs, JSObjectOps *ops,
JSClass *clasp)
{
map->nrefs = nrefs;
map->ops = ops;
map->nslots = JS_INITIAL_NSLOTS;
map->freeslot = JSSLOT_FREE(clasp);
}
JSObjectMap *
js_NewObjectMap(JSContext *cx, jsrefcount nrefs, JSObjectOps *ops,
JSClass *clasp, JSObject *obj)
{
return (JSObjectMap *) js_NewScope(cx, nrefs, ops, clasp, obj);
}
void
js_DestroyObjectMap(JSContext *cx, JSObjectMap *map)
{
js_DestroyScope(cx, (JSScope *)map);
}
JSObjectMap *
js_HoldObjectMap(JSContext *cx, JSObjectMap *map)
{
JS_ASSERT(map->nrefs >= 0);
JS_ATOMIC_INCREMENT(&map->nrefs);
return map;
}
JSObjectMap *
js_DropObjectMap(JSContext *cx, JSObjectMap *map, JSObject *obj)
{
JS_ASSERT(map->nrefs > 0);
JS_ATOMIC_DECREMENT(&map->nrefs);
if (map->nrefs == 0) {
map->ops->destroyObjectMap(cx, map);
return NULL;
}
if (MAP_IS_NATIVE(map) && ((JSScope *)map)->object == obj)
((JSScope *)map)->object = NULL;
return map;
}
static JSBool
GetClassPrototype(JSContext *cx, JSObject *scope, const char *name,
JSObject **protop);
JSObject *
js_NewObject(JSContext *cx, JSClass *clasp, JSObject *proto, JSObject *parent)
{
JSObject *obj, *ctor;
JSObjectOps *ops;
JSObjectMap *map;
jsval cval;
uint32 nslots, i;
jsval *newslots;
/* Allocate an object from the GC heap and zero it. */
obj = (JSObject *) js_AllocGCThing(cx, GCX_OBJECT);
if (!obj)
return NULL;
/* Bootstrap the ur-object, and make it the default prototype object. */
if (!proto) {
if (!GetClassPrototype(cx, parent, clasp->name, &proto))
goto bad;
if (!proto && !GetClassPrototype(cx, parent, js_Object_str, &proto))
goto bad;
}
/* Always call the class's getObjectOps hook if it has one. */
ops = clasp->getObjectOps
? clasp->getObjectOps(cx, clasp)
: &js_ObjectOps;
if (proto && (map = proto->map)->ops == ops) {
/* Default parent to the parent of the prototype's constructor. */
if (!parent) {
if (!OBJ_GET_PROPERTY(cx, proto,
(jsid)cx->runtime->atomState.constructorAtom,
&cval)) {
goto bad;
}
if (JSVAL_IS_OBJECT(cval) && (ctor = JSVAL_TO_OBJECT(cval)) != NULL)
parent = OBJ_GET_PARENT(cx, ctor);
}
/* Share the given prototype's map. */
obj->map = js_HoldObjectMap(cx, map);
/* Ensure that obj starts with the minimum slots for clasp. */
nslots = JS_INITIAL_NSLOTS;
} else {
/* Leave parent alone. Allocate a new map for obj. */
map = ops->newObjectMap(cx, 1, ops, clasp, obj);
if (!map)
goto bad;
obj->map = map;
/* Let ops->newObjectMap set nslots so as to reserve slots. */
nslots = map->nslots;
}
/* Allocate a slots vector, with a -1'st element telling its length. */
newslots = (jsval *) JS_malloc(cx, (nslots + 1) * sizeof(jsval));
if (!newslots) {
js_DropObjectMap(cx, obj->map, obj);
obj->map = NULL;
goto bad;
}
newslots[0] = nslots;
newslots++;
/* Set the proto, parent, and class properties. */
newslots[JSSLOT_PROTO] = OBJECT_TO_JSVAL(proto);
newslots[JSSLOT_PARENT] = OBJECT_TO_JSVAL(parent);
newslots[JSSLOT_CLASS] = PRIVATE_TO_JSVAL(clasp);
/* Clear above JSSLOT_CLASS so the GC doesn't load uninitialized memory. */
for (i = JSSLOT_CLASS + 1; i < nslots; i++)
newslots[i] = JSVAL_VOID;
/* Store newslots after initializing all of 'em, just in case. */
obj->slots = newslots;
if (cx->runtime->objectHook)
cx->runtime->objectHook(cx, obj, JS_TRUE, cx->runtime->objectHookData);
return obj;
bad:
cx->newborn[GCX_OBJECT] = NULL;
return NULL;
}
static JSBool
FindConstructor(JSContext *cx, JSObject *scope, const char *name, jsval *vp)
{
JSAtom *atom;
JSObject *obj;
JSObject *pobj;
JSScopeProperty *sprop;
atom = js_Atomize(cx, name, strlen(name), 0);
if (!atom)
return JS_FALSE;
if (scope || (cx->fp && (scope = cx->fp->scopeChain) != NULL)) {
/* Find the topmost object in the scope chain. */
do {
obj = scope;
scope = OBJ_GET_PARENT(cx, obj);
} while (scope);
} else {
obj = cx->globalObject;
if (!obj) {
*vp = JSVAL_VOID;
return JS_TRUE;
}
}
if (!OBJ_LOOKUP_PROPERTY(cx, obj, (jsid)atom, &pobj, (JSProperty**)&sprop))
return JS_FALSE;
if (!sprop) {
*vp = JSVAL_VOID;
return JS_TRUE;
}
JS_ASSERT(OBJ_IS_NATIVE(pobj));
JS_ASSERT(SPROP_HAS_VALID_SLOT(sprop, OBJ_SCOPE(pobj)));
*vp = OBJ_GET_SLOT(cx, pobj, sprop->slot);
OBJ_DROP_PROPERTY(cx, pobj, (JSProperty *)sprop);
return JS_TRUE;
}
JSObject *
js_ConstructObject(JSContext *cx, JSClass *clasp, JSObject *proto,
JSObject *parent, uintN argc, jsval *argv)
{
jsval cval, rval;
JSObject *obj, *ctor;
if (!FindConstructor(cx, parent, clasp->name, &cval))
return NULL;
if (JSVAL_IS_PRIMITIVE(cval)) {
js_ReportIsNotFunction(cx, &cval, JS_TRUE);
return NULL;
}
/*
* If proto or parent are NULL, set them to Constructor.prototype and/or
* Constructor.__parent__, just like JSOP_NEW does.
*/
ctor = JSVAL_TO_OBJECT(cval);
if (!parent)
parent = OBJ_GET_PARENT(cx, ctor);
if (!proto) {
if (!OBJ_GET_PROPERTY(cx, ctor,
(jsid)cx->runtime->atomState.classPrototypeAtom,
&rval)) {
return NULL;
}
if (JSVAL_IS_OBJECT(rval))
proto = JSVAL_TO_OBJECT(rval);
}
obj = js_NewObject(cx, clasp, proto, parent);
if (!obj)
return NULL;
if (!js_InternalConstruct(cx, obj, cval, argc, argv, &rval))
goto bad;
return JSVAL_IS_OBJECT(rval) ? JSVAL_TO_OBJECT(rval) : obj;
bad:
cx->newborn[GCX_OBJECT] = NULL;
return NULL;
}
void
js_FinalizeObject(JSContext *cx, JSObject *obj)
{
JSObjectMap *map;
/* Cope with stillborn objects that have no map. */
map = obj->map;
if (!map)
return;
JS_ASSERT(obj->slots);
if (cx->runtime->objectHook)
cx->runtime->objectHook(cx, obj, JS_FALSE, cx->runtime->objectHookData);
/* Remove all watchpoints with weak links to obj. */
JS_ClearWatchPointsForObject(cx, obj);
/*
* Finalize obj first, in case it needs map and slots. Optimized to use
* LOCKED_OBJ_GET_CLASS instead of OBJ_GET_CLASS, so we avoid "promoting"
* obj's scope from lock-free to lock-full (see jslock.c:ClaimScope) when
* we're called from the GC. Only the GC should call js_FinalizeObject,
* and no other threads run JS (and possibly racing to update obj->slots)
* while the GC is running.
*/
LOCKED_OBJ_GET_CLASS(obj)->finalize(cx, obj);
/* Drop map and free slots. */
js_DropObjectMap(cx, map, obj);
obj->map = NULL;
JS_free(cx, obj->slots - 1);
obj->slots = NULL;
}
/* XXXbe if one adds props, deletes earlier props, adds more, the last added
won't recycle the deleted props' slots. */
JSBool
js_AllocSlot(JSContext *cx, JSObject *obj, uint32 *slotp)
{
JSObjectMap *map;
uint32 nslots, i;
size_t nbytes;
jsval *newslots;
map = obj->map;
JS_ASSERT(!MAP_IS_NATIVE(map) || ((JSScope *)map)->object == obj);
nslots = map->nslots;
if (map->freeslot >= nslots) {
nslots = map->freeslot;
JS_ASSERT(nslots >= JS_INITIAL_NSLOTS);
nslots += (nslots + 1) / 2;
nbytes = (nslots + 1) * sizeof(jsval);
#if defined(XP_PC) && defined _MSC_VER && _MSC_VER <= 800
if (nbytes > 60000U) {
JS_ReportOutOfMemory(cx);
return JS_FALSE;
}
#endif
newslots = (jsval *) JS_realloc(cx, obj->slots - 1, nbytes);
if (!newslots)
return JS_FALSE;
for (i = 1 + newslots[0]; i <= nslots; i++)
newslots[i] = JSVAL_VOID;
newslots[0] = map->nslots = nslots;
obj->slots = newslots + 1;
}
#ifdef TOO_MUCH_GC
obj->slots[map->freeslot] = JSVAL_VOID;
#endif
*slotp = map->freeslot++;
return JS_TRUE;
}
void
js_FreeSlot(JSContext *cx, JSObject *obj, uint32 slot)
{
JSObjectMap *map;
uint32 nslots;
size_t nbytes;
jsval *newslots;
OBJ_CHECK_SLOT(obj, slot);
obj->slots[slot] = JSVAL_VOID;
map = obj->map;
JS_ASSERT(!MAP_IS_NATIVE(map) || ((JSScope *)map)->object == obj);
if (map->freeslot == slot + 1)
map->freeslot = slot;
nslots = map->nslots;
if (nslots > JS_INITIAL_NSLOTS && map->freeslot < nslots / 2) {
nslots = map->freeslot;
nslots += nslots / 2;
if (nslots < JS_INITIAL_NSLOTS)
nslots = JS_INITIAL_NSLOTS;
nbytes = (nslots + 1) * sizeof(jsval);
newslots = (jsval *) JS_realloc(cx, obj->slots - 1, nbytes);
if (!newslots)
return;
newslots[0] = map->nslots = nslots;
obj->slots = newslots + 1;
}
}
#if JS_BUG_EMPTY_INDEX_ZERO
#define CHECK_FOR_EMPTY_INDEX(id) \
JS_BEGIN_MACRO \
if (JSSTRING_LENGTH(_str) == 0) \
id = JSVAL_ZERO; \
JS_END_MACRO
#else
#define CHECK_FOR_EMPTY_INDEX(id) /* nothing */
#endif
/* JSVAL_INT_MAX as a string */
#define JSVAL_INT_MAX_STRING "1073741823"
#define CHECK_FOR_FUNNY_INDEX(id) \
JS_BEGIN_MACRO \
if (!JSVAL_IS_INT(id)) { \
JSAtom *atom_ = (JSAtom *)id; \
JSString *str_ = ATOM_TO_STRING(atom_); \
const jschar *cp_ = str_->chars; \
JSBool negative_ = (*cp_ == '-'); \
if (negative_) cp_++; \
if (JS7_ISDEC(*cp_) && \
str_->length - negative_ <= sizeof(JSVAL_INT_MAX_STRING) - 1) \
{ \
jsuint index_ = JS7_UNDEC(*cp_++); \
jsuint oldIndex_ = 0; \
jsuint c_ = 0; \
if (index_ != 0) { \
while (JS7_ISDEC(*cp_)) { \
oldIndex_ = index_; \
c_ = JS7_UNDEC(*cp_); \
index_ = 10 * index_ + c_; \
cp_++; \
} \
} \
if (*cp_ == 0 && \
(oldIndex_ < (JSVAL_INT_MAX / 10) || \
(oldIndex_ == (JSVAL_INT_MAX / 10) && \
c_ <= (JSVAL_INT_MAX % 10)))) { \
if (negative_) index_ = 0 - index_; \
id = INT_TO_JSVAL((jsint)index_); \
} \
} else { \
CHECK_FOR_EMPTY_INDEX(id); \
} \
} \
JS_END_MACRO
JSScopeProperty *
js_AddNativeProperty(JSContext *cx, JSObject *obj, jsid id,
JSPropertyOp getter, JSPropertyOp setter, uint32 slot,
uintN attrs, uintN flags, intN shortid)
{
JSScope *scope;
JSScopeProperty *sprop;
JS_LOCK_OBJ(cx, obj);
scope = js_GetMutableScope(cx, obj);
if (!scope) {
sprop = NULL;
} else {
/*
* Handle old bug that took empty string as zero index. Also convert
* string indices to integers if appropriate.
*/
CHECK_FOR_FUNNY_INDEX(id);
sprop = js_AddScopeProperty(cx, scope, id, getter, setter, slot, attrs,
flags, shortid);
}
JS_UNLOCK_OBJ(cx, obj);
return sprop;
}
JSScopeProperty *
js_ChangeNativePropertyAttrs(JSContext *cx, JSObject *obj,
JSScopeProperty *sprop, uintN attrs, uintN mask,
JSPropertyOp getter, JSPropertyOp setter)
{
JSScope *scope;
JS_LOCK_OBJ(cx, obj);
scope = js_GetMutableScope(cx, obj);
if (!scope) {
sprop = NULL;
} else {
sprop = js_ChangeScopePropertyAttrs(cx, scope, sprop, attrs, mask,
getter, setter);
if (sprop) {
PROPERTY_CACHE_FILL(&cx->runtime->propertyCache, obj, sprop->id,
sprop);
}
}
JS_UNLOCK_OBJ(cx, obj);
return sprop;
}
JSBool
js_DefineProperty(JSContext *cx, JSObject *obj, jsid id, jsval value,
JSPropertyOp getter, JSPropertyOp setter, uintN attrs,
JSProperty **propp)
{
return js_DefineNativeProperty(cx, obj, id, value, getter, setter, attrs,
0, 0, propp);
}
JSBool
js_DefineNativeProperty(JSContext *cx, JSObject *obj, jsid id, jsval value,
JSPropertyOp getter, JSPropertyOp setter, uintN attrs,
uintN flags, intN shortid, JSProperty **propp)
{
JSClass *clasp;
JSScope *scope;
JSScopeProperty *sprop;
/*
* Handle old bug that took empty string as zero index. Also convert
* string indices to integers if appropriate.
*/
CHECK_FOR_FUNNY_INDEX(id);
#if JS_HAS_GETTER_SETTER
/*
* If defining a getter or setter, we must check for its counterpart and
* update the attributes and property ops. A getter or setter is really
* only half of a property.
*/
if (attrs & (JSPROP_GETTER | JSPROP_SETTER)) {
JSObject *pobj;
/*
* If JS_THREADSAFE and id is found, js_LookupProperty returns with
* sprop non-null and pobj locked. If pobj == obj, the property is
* already in obj and obj has its own (mutable) scope. So if we are
* defining a getter whose setter was already defined, or vice versa,
* finish the job via js_ChangeScopePropertyAttributes, and refresh
* the property cache line for (obj, id) to map sprop.
*/
if (!js_LookupProperty(cx, obj, id, &pobj, (JSProperty **)&sprop))
return JS_FALSE;
if (sprop &&
pobj == obj &&
(sprop->attrs & (JSPROP_GETTER | JSPROP_SETTER))) {
sprop = js_ChangeScopePropertyAttrs(cx, OBJ_SCOPE(obj), sprop,
attrs, sprop->attrs,
(attrs & JSPROP_GETTER)
? getter
: sprop->getter,
(attrs & JSPROP_SETTER)
? setter
: sprop->setter);
PROPERTY_CACHE_FILL(&cx->runtime->propertyCache, obj, id, sprop);
/* NB: obj == pobj, so we can share unlock code at the bottom. */
if (!sprop)
goto bad;
goto out;
}
if (sprop) {
/* NB: call OBJ_DROP_PROPERTY, as pobj might not be native. */
OBJ_DROP_PROPERTY(cx, pobj, (JSProperty *)sprop);
sprop = NULL;
}
}
#endif /* JS_HAS_GETTER_SETTER */
/* Lock if object locking is required by this implementation. */
JS_LOCK_OBJ(cx, obj);
/* Use the object's class getter and setter by default. */
clasp = LOCKED_OBJ_GET_CLASS(obj);
if (!getter)
getter = clasp->getProperty;
if (!setter)
setter = clasp->setProperty;
/* Get obj's own scope if it has one, or create a new one for obj. */
scope = js_GetMutableScope(cx, obj);
if (!scope)
goto bad;
/* Add the property to scope, or replace an existing one of the same id. */
if (clasp->flags & JSCLASS_SHARE_ALL_PROPERTIES)
attrs |= JSPROP_SHARED;
sprop = js_AddScopeProperty(cx, scope, id, getter, setter,
SPROP_INVALID_SLOT, attrs, flags, shortid);
if (!sprop)
goto bad;
/* XXXbe called with lock held */
if (!clasp->addProperty(cx, obj, SPROP_USERID(sprop), &value)) {
(void) js_RemoveScopeProperty(cx, scope, id);
goto bad;
}
PROPERTY_CACHE_FILL(&cx->runtime->propertyCache, obj, id, sprop);
if (SPROP_HAS_VALID_SLOT(sprop, scope))
LOCKED_OBJ_SET_SLOT(obj, sprop->slot, value);
out:
if (propp)
*propp = (JSProperty *) sprop;
else
JS_UNLOCK_OBJ(cx, obj);
return JS_TRUE;
bad:
JS_UNLOCK_OBJ(cx, obj);
return JS_FALSE;
}
JS_STATIC_DLL_CALLBACK(const void *)
resolving_GetKey(JSDHashTable *table, JSDHashEntryHdr *hdr)
{
JSResolvingEntry *entry = (JSResolvingEntry *)hdr;
return &entry->key;
}
JS_STATIC_DLL_CALLBACK(JSDHashNumber)
resolving_HashKey(JSDHashTable *table, const void *ptr)
{
const JSResolvingKey *key = (const JSResolvingKey *)ptr;
return ((JSDHashNumber)key->obj >> JSVAL_TAGBITS) ^ key->id;
}
JS_PUBLIC_API(JSBool)
resolving_MatchEntry(JSDHashTable *table,
const JSDHashEntryHdr *hdr,
const void *ptr)
{
const JSResolvingEntry *entry = (const JSResolvingEntry *)hdr;
const JSResolvingKey *key = (const JSResolvingKey *)ptr;
return entry->key.obj == key->obj && entry->key.id == key->id;
}
static JSDHashTableOps resolving_dhash_ops = {
JS_DHashAllocTable,
JS_DHashFreeTable,
resolving_GetKey,
resolving_HashKey,
resolving_MatchEntry,
JS_DHashMoveEntryStub,
JS_DHashClearEntryStub,
JS_DHashFinalizeStub,
NULL
};
#if defined JS_THREADSAFE && defined DEBUG
JS_FRIEND_API(JSBool)
_js_LookupProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
JSProperty **propp, const char *file, uintN line)
#else
JS_FRIEND_API(JSBool)
js_LookupProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
JSProperty **propp)
#endif
{
JSScope *scope;
JSScopeProperty *sprop;
JSClass *clasp;
JSResolveOp resolve;
JSResolvingKey key;
JSDHashTable *table;
JSDHashEntryHdr *entry;
uint32 generation;
JSNewResolveOp newresolve;
uintN flags;
uint32 format;
JSObject *obj2, *proto;
JSBool ok;
/*
* Handle old bug that took empty string as zero index. Also convert
* string indices to integers if appropriate.
*/
CHECK_FOR_FUNNY_INDEX(id);
/* Search scopes starting with obj and following the prototype link. */
for (;;) {
JS_LOCK_OBJ(cx, obj);
SET_OBJ_INFO(obj, file, line);
scope = OBJ_SCOPE(obj);
if (scope->object == obj) {
sprop = SCOPE_GET_PROPERTY(scope, id);
} else {
/* Shared prototype scope: try resolve before lookup. */
sprop = NULL;
}
/* Try obj's class resolve hook if id was not found in obj's scope. */
if (!sprop) {
clasp = LOCKED_OBJ_GET_CLASS(obj);
resolve = clasp->resolve;
if (resolve != JS_ResolveStub) {
/* Avoid recursion on (obj, id) already being resolved on cx. */
key.obj = obj;
key.id = id;
if (cx->resolving != 0) {
table = cx->resolvingTable;
entry = JS_DHashTableOperate(table, &key, JS_DHASH_LOOKUP);
if (JS_DHASH_ENTRY_IS_BUSY(entry)) {
JS_UNLOCK_OBJ(cx, obj);
goto out;
}
} else if (!(table = cx->resolvingTable)) {
table = JS_NewDHashTable(&resolving_dhash_ops,
NULL,
sizeof(JSResolvingEntry),
JS_DHASH_MIN_SIZE);
if (!table)
goto outofmem;
cx->resolvingTable = table;
} else {
/* cx->resolving is 0, so the table had better be empty! */
JS_ASSERT(table->entryCount == 0);
}
/*
* Once we have successfully added an entry for key and bumped
* cx->resolving, control flow must go through cleanup: before
* returning.
*/
entry = JS_DHashTableOperate(table, &key, JS_DHASH_ADD);
if (!entry) {
outofmem:
JS_UNLOCK_OBJ(cx, obj);
JS_ReportOutOfMemory(cx);
return JS_FALSE;
}
((JSResolvingEntry *)entry)->key = key;
generation = table->generation;
cx->resolving++;
/* Null *propp here so we can test it at cleanup: safely. */
*propp = NULL;
if (clasp->flags & JSCLASS_NEW_RESOLVE) {
newresolve = (JSNewResolveOp)resolve;
flags = 0;
if (cx->fp && cx->fp->pc) {
format = js_CodeSpec[*cx->fp->pc].format;
if ((format & JOF_MODEMASK) != JOF_NAME)
flags |= JSRESOLVE_QUALIFIED;
if ((format & JOF_ASSIGNING) ||
(cx->fp->flags & JSFRAME_ASSIGNING)) {
flags |= JSRESOLVE_ASSIGNING;
}
}
obj2 = NULL;
JS_UNLOCK_OBJ(cx, obj);
ok = newresolve(cx, obj, ID_TO_VALUE(id), flags, &obj2);
if (!ok)
goto cleanup;
JS_LOCK_OBJ(cx, obj);
SET_OBJ_INFO(obj, file, line);
if (obj2) {
/* Resolved: juggle locks and lookup id again. */
if (obj2 != obj) {
JS_UNLOCK_OBJ(cx, obj);
JS_LOCK_OBJ(cx, obj2);
}
scope = OBJ_SCOPE(obj2);
if (!MAP_IS_NATIVE(&scope->map)) {
/* Whoops, newresolve handed back a foreign obj2. */
JS_ASSERT(obj2 != obj);
JS_UNLOCK_OBJ(cx, obj2);
ok = OBJ_LOOKUP_PROPERTY(cx, obj2, id, objp, propp);
if (!ok || *propp)
goto cleanup;
JS_LOCK_OBJ(cx, obj2);
} else {
/*
* Require that obj2 have its own scope now, as we
* do for old-style resolve. If it doesn't, then
* id was not truly resolved, and we'll find it in
* the proto chain, or miss it if obj2's proto is
* not on obj's proto chain. That last case is a
* "too bad!" case.
*/
if (scope->object == obj2)
sprop = SCOPE_GET_PROPERTY(scope, id);
}
if (obj2 != obj && !sprop) {
JS_UNLOCK_OBJ(cx, obj2);
JS_LOCK_OBJ(cx, obj);
}
}
} else {
/*
* Old resolve always requires id re-lookup if obj owns
* its scope after resolve returns.
*/
JS_UNLOCK_OBJ(cx, obj);
ok = resolve(cx, obj, ID_TO_VALUE(id));
if (!ok)
goto cleanup;
JS_LOCK_OBJ(cx, obj);
SET_OBJ_INFO(obj, file, line);
scope = OBJ_SCOPE(obj);
JS_ASSERT(MAP_IS_NATIVE(&scope->map));
if (scope->object == obj)
sprop = SCOPE_GET_PROPERTY(scope, id);
}
cleanup:
/*
* Do a raw remove only if the table hasn't changed since entry
* was added, and only if fewer entries were removed than would
* cause alpha to be < .5 (alpha is at most .75). Otherwise,
* use JS_DHashTableOperate to re-lookup the key and remove its
* entry, compressing or shrinking the table as needed.
*/
if (table->generation == generation &&
table->removedCount < JS_DHASH_TABLE_SIZE(table) >> 2) {
JS_DHashTableRawRemove(table, entry);
} else {
JS_DHashTableOperate(table, &key, JS_DHASH_REMOVE);
}
cx->resolving--;
if (!ok || *propp)
return ok;
}
}
if (sprop) {
JS_ASSERT(OBJ_SCOPE(obj) == scope);
*objp = scope->object; /* XXXbe hide in jsscope.[ch] */
*propp = (JSProperty *) sprop;
return JS_TRUE;
}
proto = LOCKED_OBJ_GET_PROTO(obj);
JS_UNLOCK_OBJ(cx, obj);
if (!proto)
break;
if (!OBJ_IS_NATIVE(proto))
return OBJ_LOOKUP_PROPERTY(cx, proto, id, objp, propp);
obj = proto;
}
out:
*objp = NULL;
*propp = NULL;
return JS_TRUE;
}
JS_FRIEND_API(JSBool)
js_FindProperty(JSContext *cx, jsid id, JSObject **objp, JSObject **pobjp,
JSProperty **propp)
{
JSRuntime *rt;
JSObject *obj, *pobj, *lastobj;
JSScopeProperty *sprop;
JSProperty *prop;
rt = cx->runtime;
obj = cx->fp->scopeChain;
do {
/* Try the property cache and return immediately on cache hit. */
if (OBJ_IS_NATIVE(obj)) {
JS_LOCK_OBJ(cx, obj);
PROPERTY_CACHE_TEST(&rt->propertyCache, obj, id, sprop);
if (sprop) {
JS_ASSERT(OBJ_IS_NATIVE(obj));
*objp = obj;
*pobjp = obj;
*propp = (JSProperty *) sprop;
return JS_TRUE;
}
JS_UNLOCK_OBJ(cx, obj);
}
/* If cache miss, take the slow path. */
if (!OBJ_LOOKUP_PROPERTY(cx, obj, id, &pobj, &prop))
return JS_FALSE;
if (prop) {
if (OBJ_IS_NATIVE(pobj)) {
sprop = (JSScopeProperty *) prop;
PROPERTY_CACHE_FILL(&rt->propertyCache, pobj, id, sprop);
}
*objp = obj;
*pobjp = pobj;
*propp = prop;
return JS_TRUE;
}
lastobj = obj;
} while ((obj = OBJ_GET_PARENT(cx, obj)) != NULL);
*objp = lastobj;
*pobjp = NULL;
*propp = NULL;
return JS_TRUE;
}
JSBool
js_FindVariable(JSContext *cx, jsid id, JSObject **objp, JSObject **pobjp,
JSProperty **propp)
{
JSObject *obj;
JSProperty *prop;
/*
* First look for id's property along the "with" statement and the
* statically-linked scope chains.
*/
if (!js_FindProperty(cx, id, objp, pobjp, propp))
return JS_FALSE;
if (*propp)
return JS_TRUE;
/*
* Use the top-level scope from the scope chain, which won't end in the
* same scope as cx->globalObject for cross-context function calls.
*/
obj = *objp;
JS_ASSERT(obj);
/*
* Make a top-level variable.
*/
if (JS_HAS_STRICT_OPTION(cx)) {
JSString *str = JSVAL_TO_STRING(ID_TO_VALUE(id));
if (!JS_ReportErrorFlagsAndNumber(cx,
JSREPORT_WARNING | JSREPORT_STRICT,
js_GetErrorMessage, NULL,
JSMSG_UNDECLARED_VAR,
JS_GetStringBytes(str))) {
return JS_FALSE;
}
}
if (!OBJ_DEFINE_PROPERTY(cx, obj, id, JSVAL_VOID, NULL, NULL,
JSPROP_ENUMERATE, &prop)) {
return JS_FALSE;
}
*pobjp = obj;
*propp = prop;
return JS_TRUE;
}
JSBool
js_GetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
{
JSObject *obj2;
JSScopeProperty *sprop;
JSScope *scope;
uint32 slot;
/*
* Handle old bug that took empty string as zero index. Also convert
* string indices to integers if appropriate.
*/
CHECK_FOR_FUNNY_INDEX(id);
if (!js_LookupProperty(cx, obj, id, &obj2, (JSProperty **)&sprop))
return JS_FALSE;
if (!sprop) {
jsval default_val;
#if JS_BUG_NULL_INDEX_PROPS
/* Indexed properties defaulted to null in old versions. */
default_val = (JSVAL_IS_INT(id) && JSVAL_TO_INT(id) >= 0)
? JSVAL_NULL
: JSVAL_VOID;
#else
default_val = JSVAL_VOID;
#endif
*vp = default_val;
if (!OBJ_GET_CLASS(cx, obj)->getProperty(cx, obj, ID_TO_VALUE(id), vp))
return JS_FALSE;
/*
* Give a strict warning if foo.bar is evaluated by a script for an
* object foo with no property named 'bar'.
*/
if (JS_HAS_STRICT_OPTION(cx) &&
*vp == default_val &&
cx->fp && cx->fp->pc &&
(*cx->fp->pc == JSOP_GETPROP || *cx->fp->pc == JSOP_GETELEM))
{
jsbytecode *pc, *endpc;
JSString *str;
/* Kludge to allow (typeof foo == "undefined") tests. */
JS_ASSERT(cx->fp->script);
pc = cx->fp->pc;
pc += js_CodeSpec[*pc].length;
endpc = cx->fp->script->code + cx->fp->script->length;
while (pc < endpc) {
if (*pc == JSOP_TYPEOF)
return JS_TRUE;
if (*pc != JSOP_GROUP)
break;
pc++;
}
/* Ok, bad undefined property reference: whine about it. */
str = js_DecompileValueGenerator(cx, JS_FALSE, ID_TO_VALUE(id),
NULL);
if (!str ||
!JS_ReportErrorFlagsAndNumber(cx,
JSREPORT_WARNING|JSREPORT_STRICT,
js_GetErrorMessage, NULL,
JSMSG_UNDEFINED_PROP,
JS_GetStringBytes(str))) {
return JS_FALSE;
}
}
return JS_TRUE;
}
if (!OBJ_IS_NATIVE(obj2)) {
OBJ_DROP_PROPERTY(cx, obj2, (JSProperty *)sprop);
return OBJ_GET_PROPERTY(cx, obj2, id, vp);
}
/* Unlock obj2 before calling getter, relock after to avoid deadlock. */
scope = OBJ_SCOPE(obj2);
slot = sprop->slot;
*vp = (slot != SPROP_INVALID_SLOT)
? LOCKED_OBJ_GET_SLOT(obj2, slot)
: JSVAL_VOID;
JS_UNLOCK_SCOPE(cx, scope);
if (!SPROP_GET(cx, sprop, obj, obj2, vp))
return JS_FALSE;
JS_LOCK_SCOPE(cx, scope);
if (SPROP_HAS_VALID_SLOT(sprop, scope)) {
LOCKED_OBJ_SET_SLOT(obj2, slot, *vp);
PROPERTY_CACHE_FILL(&cx->runtime->propertyCache, obj2, id, sprop);
}
JS_UNLOCK_SCOPE(cx, scope);
return JS_TRUE;
}
JSBool
js_SetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
{
JSObject *pobj;
JSScopeProperty *sprop;
JSRuntime *rt;
JSClass *clasp;
JSScope *scope;
uintN attrs, flags;
intN shortid;
JSPropertyOp getter, setter;
jsval pval;
uint32 slot;
/*
* Handle old bug that took empty string as zero index. Also convert
* string indices to integers if appropriate.
*/
CHECK_FOR_FUNNY_INDEX(id);
if (!js_LookupProperty(cx, obj, id, &pobj, (JSProperty **)&sprop))
return JS_FALSE;
if (sprop && !OBJ_IS_NATIVE(pobj)) {
OBJ_DROP_PROPERTY(cx, pobj, (JSProperty *)sprop);
sprop = NULL;
}
rt = cx->runtime;
clasp = OBJ_GET_CLASS(cx, obj);
/*
* Now either sprop is null, meaning id was not found in obj or one of its
* prototypes; or sprop is non-null, meaning id was found in pobj's scope.
* If JS_THREADSAFE and sprop is non-null, then scope is locked, and sprop
* is held: we must OBJ_DROP_PROPERTY or JS_UNLOCK_SCOPE before we return
* (the two are equivalent for native objects, but we use JS_UNLOCK_SCOPE
* because it is cheaper).
*/
attrs = JSPROP_ENUMERATE;
flags = 0;
shortid = 0;
getter = clasp->getProperty;
setter = clasp->setProperty;
if (sprop) {
attrs = sprop->attrs;
if (attrs & JSPROP_READONLY) {
/* XXXbe ECMA violation: readonly proto-property stops set cold. */
OBJ_DROP_PROPERTY(cx, pobj, (JSProperty *)sprop);
if (!JSVERSION_IS_ECMA(cx->version)) {
JSString *str = js_DecompileValueGenerator(cx,
JSDVG_IGNORE_STACK,
ID_TO_VALUE(id),
NULL);
if (str) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_READ_ONLY,
JS_GetStringBytes(str));
}
return JS_FALSE;
}
return JS_TRUE;
}
/*
* Set scope for use below. It was locked by js_LookupProperty, and
* we know pobj owns it (i.e., scope->object == pobj). Therefore we
* optimize JS_UNLOCK_OBJ(cx, pobj) into JS_UNLOCK_SCOPE(cx, scope).
*/
scope = OBJ_SCOPE(pobj);
if (pobj != obj) {
/* Don't clone a setter or shared prototype property. */
if (attrs & (JSPROP_SETTER | JSPROP_SHARED)) {
JS_UNLOCK_SCOPE(cx, scope);
return SPROP_SET(cx, sprop, obj, pobj, vp);
}
/* XXXbe ECMA violation: inherit attrs, getter, setter. */
flags = sprop->flags;
shortid = sprop->shortid;
getter = sprop->getter;
setter = sprop->setter;
JS_UNLOCK_SCOPE(cx, scope);
/* Recover watched setter *after* releasing scope's lock. */
if ((attrs & JSPROP_SETTER)
? ((JSFunction *)JS_GetPrivate(cx, (JSObject *)setter))->native
== js_watch_set_wrapper
: setter == js_watch_set) {
setter = js_GetWatchedSetter(rt, scope, sprop);
}
sprop = NULL;
}
#ifdef __GNUC__ /* suppress bogus gcc warnings */
} else {
scope = NULL;
#endif
}
if (!sprop) {
/* Find or make a property descriptor with the right heritage. */
JS_LOCK_OBJ(cx, obj);
scope = js_GetMutableScope(cx, obj);
if (!scope) {
JS_UNLOCK_OBJ(cx, obj);
return JS_FALSE;
}
if (clasp->flags & JSCLASS_SHARE_ALL_PROPERTIES)
attrs |= JSPROP_SHARED;
sprop = js_AddScopeProperty(cx, scope, id, getter, setter,
SPROP_INVALID_SLOT, attrs, flags, shortid);
if (!sprop) {
JS_UNLOCK_SCOPE(cx, scope);
return JS_FALSE;
}
/* XXXbe called with obj locked */
if (!clasp->addProperty(cx, obj, SPROP_USERID(sprop), vp)) {
(void) js_RemoveScopeProperty(cx, scope, id);
JS_UNLOCK_SCOPE(cx, scope);
return JS_FALSE;
}
/* Initialize new property value (passed to setter) to undefined. */
if (SPROP_HAS_VALID_SLOT(sprop, scope))
LOCKED_OBJ_SET_SLOT(obj, sprop->slot, JSVAL_VOID);
PROPERTY_CACHE_FILL(&rt->propertyCache, obj, id, sprop);
}
/* Get the current property value from its slot. */
slot = sprop->slot;
if (slot != SPROP_INVALID_SLOT) {
JS_ASSERT(slot < obj->map->freeslot);
pval = LOCKED_OBJ_GET_SLOT(obj, slot);
/* If sprop has a stub setter, keep scope locked and just store *vp. */
if (!sprop->setter) {
GC_POKE(cx, pval);
LOCKED_OBJ_SET_SLOT(obj, slot, *vp);
JS_UNLOCK_SCOPE(cx, scope);
return JS_TRUE;
}
}
/* Avoid deadlock by unlocking obj's scope while calling sprop's setter. */
JS_UNLOCK_SCOPE(cx, scope);
/* Let the setter modify vp before copying from it to obj->slots[slot]. */
if (!SPROP_SET(cx, sprop, obj, obj, vp))
return JS_FALSE;
/* Relock obj's scope until we are done with sprop. */
JS_LOCK_SCOPE(cx, scope);
/*
* Check whether sprop is still around (was not deleted), and whether it
* has a slot (it may never have had one, or we may have lost a race with
* someone who cleared scope).
*/
if (SPROP_HAS_VALID_SLOT(sprop, scope)) {
GC_POKE(cx, pval);
LOCKED_OBJ_SET_SLOT(obj, slot, *vp);
}
JS_UNLOCK_SCOPE(cx, scope);
return JS_TRUE;
}
JSBool
js_GetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop,
uintN *attrsp)
{
JSBool noprop, ok;
JSScopeProperty *sprop;
noprop = !prop;
if (noprop) {
if (!js_LookupProperty(cx, obj, id, &obj, &prop))
return JS_FALSE;
if (!prop) {
*attrsp = 0;
return JS_TRUE;
}
if (!OBJ_IS_NATIVE(obj)) {
ok = OBJ_GET_ATTRIBUTES(cx, obj, id, prop, attrsp);
OBJ_DROP_PROPERTY(cx, obj, prop);
return ok;
}
}
sprop = (JSScopeProperty *)prop;
*attrsp = sprop->attrs;
if (noprop)
OBJ_DROP_PROPERTY(cx, obj, prop);
return JS_TRUE;
}
JSBool
js_SetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop,
uintN *attrsp)
{
JSBool noprop, ok;
JSScopeProperty *sprop;
noprop = !prop;
if (noprop) {
if (!js_LookupProperty(cx, obj, id, &obj, &prop))
return JS_FALSE;
if (!prop)
return JS_TRUE;
if (!OBJ_IS_NATIVE(obj)) {
ok = OBJ_SET_ATTRIBUTES(cx, obj, id, prop, attrsp);
OBJ_DROP_PROPERTY(cx, obj, prop);
return ok;
}
}
sprop = (JSScopeProperty *)prop;
sprop = js_ChangeNativePropertyAttrs(cx, obj, sprop,
*attrsp &
~(JSPROP_GETTER | JSPROP_SETTER), 0,
sprop->getter, sprop->setter);
if (noprop)
OBJ_DROP_PROPERTY(cx, obj, prop);
return (sprop != NULL);
}
JSBool
js_DeleteProperty(JSContext *cx, JSObject *obj, jsid id, jsval *rval)
{
#if JS_HAS_PROP_DELETE
JSObject *proto;
JSProperty *prop;
JSScopeProperty *sprop;
JSString *str;
JSScope *scope;
JSBool ok;
*rval = JSVERSION_IS_ECMA(cx->version) ? JSVAL_TRUE : JSVAL_VOID;
/*
* Handle old bug that took empty string as zero index. Also convert
* string indices to integers if appropriate.
*/
CHECK_FOR_FUNNY_INDEX(id);
if (!js_LookupProperty(cx, obj, id, &proto, &prop))
return JS_FALSE;
if (!prop || proto != obj) {
/*
* If the property was found in a native prototype, check whether it's
* shared and permanent. Such a property stands for direct properties
* in all delegating objects, matching ECMA semantics without bloating
* each delegating object.
*/
if (prop) {
if (OBJ_IS_NATIVE(proto)) {
sprop = (JSScopeProperty *)prop;
if ((~sprop->attrs & (JSPROP_SHARED | JSPROP_PERMANENT)) == 0)
*rval = JSVAL_FALSE;
}
OBJ_DROP_PROPERTY(cx, proto, prop);
if (*rval == JSVAL_FALSE)
return JS_TRUE;
}
/*
* If no property, or the property comes unshared or impermanent from
* a prototype, call the class's delProperty hook, passing rval as the
* result parameter.
*/
return OBJ_GET_CLASS(cx, obj)->delProperty(cx, obj, ID_TO_VALUE(id),
rval);
}
sprop = (JSScopeProperty *)prop;
if (sprop->attrs & JSPROP_PERMANENT) {
OBJ_DROP_PROPERTY(cx, obj, prop);
if (JSVERSION_IS_ECMA(cx->version)) {
*rval = JSVAL_FALSE;
return JS_TRUE;
}
str = js_DecompileValueGenerator(cx, JSDVG_IGNORE_STACK,
ID_TO_VALUE(id), NULL);
if (str) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_PERMANENT, JS_GetStringBytes(str));
}
return JS_FALSE;
}
/* XXXbe called with obj locked */
if (!LOCKED_OBJ_GET_CLASS(obj)->delProperty(cx, obj, SPROP_USERID(sprop),
rval)) {
OBJ_DROP_PROPERTY(cx, obj, prop);
return JS_FALSE;
}
scope = OBJ_SCOPE(obj);
if (SPROP_HAS_VALID_SLOT(sprop, scope))
GC_POKE(cx, LOCKED_OBJ_GET_SLOT(obj, sprop->slot));
PROPERTY_CACHE_FILL(&cx->runtime->propertyCache, obj, id, NULL);
ok = js_RemoveScopeProperty(cx, scope, id);
OBJ_DROP_PROPERTY(cx, obj, prop);
return ok;
#else /* !JS_HAS_PROP_DELETE */
jsval null = JSVAL_NULL;
*rval = JSVAL_VOID;
return js_SetProperty(cx, obj, id, &null);
#endif /* !JS_HAS_PROP_DELETE */
}
JSBool
js_DefaultValue(JSContext *cx, JSObject *obj, JSType hint, jsval *vp)
{
jsval v;
JSString *str;
v = OBJECT_TO_JSVAL(obj);
switch (hint) {
case JSTYPE_STRING:
/*
* Propagate the exception if js_TryMethod finds an appropriate
* method, and calling that method returned failure.
*/
if (!js_TryMethod(cx, obj, cx->runtime->atomState.toStringAtom, 0, NULL,
&v))
return JS_FALSE;
if (!JSVAL_IS_PRIMITIVE(v)) {
if (!OBJ_GET_CLASS(cx, obj)->convert(cx, obj, hint, &v))
return JS_FALSE;
/*
* JS1.2 never failed (except for malloc failure) to convert an
* object to a string. ECMA requires an error if both toString
* and valueOf fail to produce a primitive value.
*/
if (!JSVAL_IS_PRIMITIVE(v) && cx->version == JSVERSION_1_2) {
char *bytes = JS_smprintf("[object %s]",
OBJ_GET_CLASS(cx, obj)->name);
if (!bytes)
return JS_FALSE;
str = JS_NewString(cx, bytes, strlen(bytes));
if (!str) {
free(bytes);
return JS_FALSE;
}
v = STRING_TO_JSVAL(str);
goto out;
}
}
break;
default:
if (!OBJ_GET_CLASS(cx, obj)->convert(cx, obj, hint, &v))
return JS_FALSE;
if (!JSVAL_IS_PRIMITIVE(v)) {
JSType type = JS_TypeOfValue(cx, v);
if (type == hint ||
(type == JSTYPE_FUNCTION && hint == JSTYPE_OBJECT)) {
goto out;
}
/* Don't convert to string (source object literal) for JS1.2. */
if (cx->version == JSVERSION_1_2 && hint == JSTYPE_BOOLEAN)
goto out;
if (!js_TryMethod(cx, obj, cx->runtime->atomState.toStringAtom, 0,
NULL, &v))
return JS_FALSE;
}
break;
}
if (!JSVAL_IS_PRIMITIVE(v)) {
/* Avoid recursive death through js_DecompileValueGenerator. */
if (hint == JSTYPE_STRING) {
str = JS_InternString(cx, OBJ_GET_CLASS(cx, obj)->name);
if (!str)
return JS_FALSE;
} else {
str = NULL;
}
*vp = OBJECT_TO_JSVAL(obj);
str = js_DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, v, str);
if (str) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_CANT_CONVERT_TO,
JS_GetStringBytes(str),
(hint == JSTYPE_VOID)
? "primitive type"
: js_type_str[hint]);
}
return JS_FALSE;
}
out:
*vp = v;
return JS_TRUE;
}
JSIdArray *
js_NewIdArray(JSContext *cx, jsint length)
{
JSIdArray *ida;
ida = (JSIdArray *)
JS_malloc(cx, sizeof(JSIdArray) + (length - 1) * sizeof(jsval));
if (ida)
ida->length = length;
return ida;
}
JSIdArray *
js_GrowIdArray(JSContext *cx, JSIdArray *ida, jsint length)
{
ida = (JSIdArray *)
JS_realloc(cx, ida, sizeof(JSIdArray) + (length - 1) * sizeof(jsval));
if (ida)
ida->length = length;
return ida;
}
/* Private type used to iterate over all properties of a native JS object */
typedef struct JSNativeIteratorState {
jsint next_index; /* index into jsid array */
JSIdArray *ida; /* All property ids in enumeration */
} JSNativeIteratorState;
/*
* This function is used to enumerate the properties of native JSObjects
* and those host objects that do not define a JSNewEnumerateOp-style iterator
* function.
*/
JSBool
js_Enumerate(JSContext *cx, JSObject *obj, JSIterateOp enum_op,
jsval *statep, jsid *idp)
{
JSObject *proto_obj;
JSClass *clasp;
JSEnumerateOp enumerate;
JSScopeProperty *sprop, *lastProp;
jsint i, length;
JSScope *scope;
JSIdArray *ida;
JSNativeIteratorState *state;
clasp = OBJ_GET_CLASS(cx, obj);
enumerate = clasp->enumerate;
if (clasp->flags & JSCLASS_NEW_ENUMERATE)
return ((JSNewEnumerateOp) enumerate)(cx, obj, enum_op, statep, idp);
switch (enum_op) {
case JSENUMERATE_INIT:
if (!enumerate(cx, obj))
goto init_error;
length = 0;
/*
* The set of all property ids is pre-computed when the iterator
* is initialized so as to avoid problems with properties being
* deleted during the iteration.
*/
JS_LOCK_OBJ(cx, obj);
scope = OBJ_SCOPE(obj);
/*
* If this object shares a scope with its prototype, don't enumerate
* its properties. Otherwise they will be enumerated a second time
* when the prototype object is enumerated.
*/
proto_obj = OBJ_GET_PROTO(cx, obj);
if (proto_obj && scope == OBJ_SCOPE(proto_obj)) {
ida = js_NewIdArray(cx, 0);
if (!ida) {
JS_UNLOCK_OBJ(cx, obj);
goto init_error;
}
} else {
/* Object has a private scope; Enumerate all props in scope. */
for (sprop = lastProp = SCOPE_LAST_PROP(scope); sprop;
sprop = sprop->parent) {
if ((sprop->attrs & JSPROP_ENUMERATE) &&
!(sprop->flags & SPROP_IS_ALIAS) &&
(!SCOPE_HAD_MIDDLE_DELETE(scope) ||
SCOPE_HAS_PROPERTY(scope, sprop))) {
length++;
}
}
ida = js_NewIdArray(cx, length);
if (!ida) {
JS_UNLOCK_OBJ(cx, obj);
goto init_error;
}
i = length;
for (sprop = lastProp; sprop; sprop = sprop->parent) {
if ((sprop->attrs & JSPROP_ENUMERATE) &&
!(sprop->flags & SPROP_IS_ALIAS) &&
(!SCOPE_HAD_MIDDLE_DELETE(scope) ||
SCOPE_HAS_PROPERTY(scope, sprop))) {
JS_ASSERT(i > 0);
ida->vector[--i] = sprop->id;
}
}
}
JS_UNLOCK_OBJ(cx, obj);
state = (JSNativeIteratorState *)
JS_malloc(cx, sizeof(JSNativeIteratorState));
if (!state) {
JS_DestroyIdArray(cx, ida);
goto init_error;
}
state->ida = ida;
state->next_index = 0;
*statep = PRIVATE_TO_JSVAL(state);
if (idp)
*idp = INT_TO_JSVAL(length);
return JS_TRUE;
case JSENUMERATE_NEXT:
state = (JSNativeIteratorState *) JSVAL_TO_PRIVATE(*statep);
ida = state->ida;
length = ida->length;
if (state->next_index != length) {
*idp = ida->vector[state->next_index++];
return JS_TRUE;
}
/* Fall through ... */
case JSENUMERATE_DESTROY:
state = (JSNativeIteratorState *) JSVAL_TO_PRIVATE(*statep);
JS_DestroyIdArray(cx, state->ida);
JS_free(cx, state);
*statep = JSVAL_NULL;
return JS_TRUE;
default:
JS_ASSERT(0);
return JS_FALSE;
}
init_error:
*statep = JSVAL_NULL;
return JS_FALSE;
}
JSBool
js_CheckAccess(JSContext *cx, JSObject *obj, jsid id, JSAccessMode mode,
jsval *vp, uintN *attrsp)
{
JSObject *pobj;
JSProperty *prop;
JSScopeProperty *sprop;
JSClass *clasp;
JSBool ok;
if (!js_LookupProperty(cx, obj, id, &pobj, &prop))
return JS_FALSE;
if (!prop) {
*vp = JSVAL_VOID;
*attrsp = 0;
clasp = OBJ_GET_CLASS(cx, obj);
return !clasp->checkAccess ||
clasp->checkAccess(cx, obj, ID_TO_VALUE(id), mode, vp);
}
if (!OBJ_IS_NATIVE(pobj)) {
OBJ_DROP_PROPERTY(cx, pobj, prop);
return OBJ_CHECK_ACCESS(cx, pobj, id, mode, vp, attrsp);
}
sprop = (JSScopeProperty *)prop;
*vp = (SPROP_HAS_VALID_SLOT(sprop, OBJ_SCOPE(pobj)))
? LOCKED_OBJ_GET_SLOT(pobj, sprop->slot)
: JSVAL_VOID;
*attrsp = sprop->attrs;
clasp = LOCKED_OBJ_GET_CLASS(obj);
if (clasp->checkAccess) {
JS_UNLOCK_OBJ(cx, pobj);
ok = clasp->checkAccess(cx, obj, ID_TO_VALUE(id), mode, vp);
JS_LOCK_OBJ(cx, pobj);
} else {
ok = JS_TRUE;
}
OBJ_DROP_PROPERTY(cx, pobj, prop);
return ok;
}
#ifdef JS_THREADSAFE
void
js_DropProperty(JSContext *cx, JSObject *obj, JSProperty *prop)
{
JS_UNLOCK_OBJ(cx, obj);
}
#endif
static void
ReportIsNotFunction(JSContext *cx, jsval *vp, JSBool constructing)
{
/*
* The decompiler may need to access the args of the function in
* progress rather than the one we had hoped to call.
* So we switch the cx->fp to the frame below us. We stick the
* current frame in the dormantFrameChain to protect it from gc.
*/
JSStackFrame *fp = cx->fp;
if (fp->down) {
JS_ASSERT(!fp->dormantNext);
fp->dormantNext = cx->dormantFrameChain;
cx->dormantFrameChain = fp;
cx->fp = fp->down;
}
js_ReportIsNotFunction(cx, vp, constructing);
if (fp->down) {
JS_ASSERT(cx->dormantFrameChain == fp);
cx->dormantFrameChain = fp->dormantNext;
fp->dormantNext = NULL;
cx->fp = fp;
}
}
JSBool
js_Call(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
JSClass *clasp;
clasp = OBJ_GET_CLASS(cx, JSVAL_TO_OBJECT(argv[-2]));
if (!clasp->call) {
ReportIsNotFunction(cx, &argv[-2], JS_FALSE);
return JS_FALSE;
}
return clasp->call(cx, obj, argc, argv, rval);
}
JSBool
js_Construct(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
JSClass *clasp;
clasp = OBJ_GET_CLASS(cx, JSVAL_TO_OBJECT(argv[-2]));
if (!clasp->construct) {
ReportIsNotFunction(cx, &argv[-2], JS_TRUE);
return JS_FALSE;
}
return clasp->construct(cx, obj, argc, argv, rval);
}
JSBool
js_HasInstance(JSContext *cx, JSObject *obj, jsval v, JSBool *bp)
{
JSClass *clasp;
clasp = OBJ_GET_CLASS(cx, obj);
if (clasp->hasInstance)
return clasp->hasInstance(cx, obj, v, bp);
*bp = JS_FALSE;
return JS_TRUE;
}
JSBool
js_IsDelegate(JSContext *cx, JSObject *obj, jsval v, JSBool *bp)
{
JSObject *obj2;
*bp = JS_FALSE;
if (JSVAL_IS_PRIMITIVE(v))
return JS_TRUE;
obj2 = JSVAL_TO_OBJECT(v);
while ((obj2 = OBJ_GET_PROTO(cx, obj2)) != NULL) {
if (obj2 == obj) {
*bp = JS_TRUE;
break;
}
}
return JS_TRUE;
}
JSBool
js_GetClassPrototype(JSContext *cx, const char *name, JSObject **protop)
{
return GetClassPrototype(cx, NULL, name, protop);
}
static JSBool
GetClassPrototype(JSContext *cx, JSObject *scope, const char *name,
JSObject **protop)
{
jsval v;
JSObject *ctor;
if (!FindConstructor(cx, scope, name, &v))
return JS_FALSE;
if (JSVAL_IS_FUNCTION(cx, v)) {
ctor = JSVAL_TO_OBJECT(v);
if (!OBJ_GET_PROPERTY(cx, ctor,
(jsid)cx->runtime->atomState.classPrototypeAtom,
&v)) {
return JS_FALSE;
}
}
*protop = JSVAL_IS_OBJECT(v) ? JSVAL_TO_OBJECT(v) : NULL;
return JS_TRUE;
}
JSBool
js_SetClassPrototype(JSContext *cx, JSObject *ctor, JSObject *proto,
uintN attrs)
{
/*
* Use the given attributes for the prototype property of the constructor,
* as user-defined constructors have a DontEnum | DontDelete prototype (it
* may be reset), while native or "system" constructors require DontEnum |
* ReadOnly | DontDelete.
*/
if (!OBJ_DEFINE_PROPERTY(cx, ctor,
(jsid)cx->runtime->atomState.classPrototypeAtom,
OBJECT_TO_JSVAL(proto), NULL, NULL,
attrs, NULL)) {
return JS_FALSE;
}
/*
* ECMA says that Object.prototype.constructor, or f.prototype.constructor
* for a user-defined function f, is DontEnum.
*/
return OBJ_DEFINE_PROPERTY(cx, proto,
(jsid)cx->runtime->atomState.constructorAtom,
OBJECT_TO_JSVAL(ctor), NULL, NULL,
0, NULL);
}
JSBool
js_ValueToObject(JSContext *cx, jsval v, JSObject **objp)
{
JSObject *obj;
if (JSVAL_IS_NULL(v) || JSVAL_IS_VOID(v)) {
obj = NULL;
} else if (JSVAL_IS_OBJECT(v)) {
obj = JSVAL_TO_OBJECT(v);
if (!OBJ_DEFAULT_VALUE(cx, obj, JSTYPE_OBJECT, &v))
return JS_FALSE;
if (JSVAL_IS_OBJECT(v))
obj = JSVAL_TO_OBJECT(v);
} else {
if (JSVAL_IS_STRING(v)) {
obj = js_StringToObject(cx, JSVAL_TO_STRING(v));
} else if (JSVAL_IS_INT(v)) {
obj = js_NumberToObject(cx, (jsdouble)JSVAL_TO_INT(v));
} else if (JSVAL_IS_DOUBLE(v)) {
obj = js_NumberToObject(cx, *JSVAL_TO_DOUBLE(v));
} else {
JS_ASSERT(JSVAL_IS_BOOLEAN(v));
obj = js_BooleanToObject(cx, JSVAL_TO_BOOLEAN(v));
}
if (!obj)
return JS_FALSE;
}
*objp = obj;
return JS_TRUE;
}
JSObject *
js_ValueToNonNullObject(JSContext *cx, jsval v)
{
JSObject *obj;
JSString *str;
if (!js_ValueToObject(cx, v, &obj))
return NULL;
if (!obj) {
str = js_DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, v, NULL);
if (str) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_NO_PROPERTIES, JS_GetStringBytes(str));
}
}
return obj;
}
JSBool
js_TryValueOf(JSContext *cx, JSObject *obj, JSType type, jsval *rval)
{
#if JS_HAS_VALUEOF_HINT
jsval argv[1];
argv[0] = ATOM_KEY(cx->runtime->atomState.typeAtoms[type]);
return js_TryMethod(cx, obj, cx->runtime->atomState.valueOfAtom, 1, argv,
rval);
#else
return js_TryMethod(cx, obj, cx->runtime->atomState.valueOfAtom, 0, NULL,
rval);
#endif
}
JSBool
js_TryMethod(JSContext *cx, JSObject *obj, JSAtom *atom,
uintN argc, jsval *argv, jsval *rval)
{
JSErrorReporter older;
jsval fval;
JSBool ok;
/*
* Report failure only if an appropriate method was found, and calling it
* returned failure. We propagate failure in this case to make exceptions
* behave properly.
*/
older = JS_SetErrorReporter(cx, NULL);
if (OBJ_GET_PROPERTY(cx, obj, (jsid)atom, &fval) &&
!JSVAL_IS_PRIMITIVE(fval)) {
ok = js_InternalCall(cx, obj, fval, argc, argv, rval);
} else {
ok = JS_TRUE;
}
JS_SetErrorReporter(cx, older);
return ok;
}
#if JS_HAS_XDR
#include "jsxdrapi.h"
JSBool
js_XDRObject(JSXDRState *xdr, JSObject **objp)
{
JSContext *cx;
JSClass *clasp;
const char *className;
uint32 classId, classDef;
JSBool ok;
JSObject *proto;
cx = xdr->cx;
if (xdr->mode == JSXDR_ENCODE) {
clasp = OBJ_GET_CLASS(cx, *objp);
className = clasp->name;
classId = JS_XDRFindClassIdByName(xdr, className);
classDef = !classId;
if (classDef && !JS_XDRRegisterClass(xdr, clasp, &classId))
return JS_FALSE;
} else {
classDef = 0;
className = NULL;
clasp = NULL; /* quell GCC overwarning */
}
/* XDR a flag word followed (if true) by the class name. */
if (!JS_XDRUint32(xdr, &classDef))
return JS_FALSE;
if (classDef && !JS_XDRCString(xdr, (char **) &className))
return JS_FALSE;
/* From here on, return through out: to free className if it was set. */
ok = JS_XDRUint32(xdr, &classId);
if (!ok)
goto out;
if (xdr->mode != JSXDR_ENCODE) {
if (classDef) {
ok = js_GetClassPrototype(cx, className, &proto);
if (!ok)
goto out;
clasp = OBJ_GET_CLASS(cx, proto);
ok = JS_XDRRegisterClass(xdr, clasp, &classId);
if (!ok)
goto out;
} else {
clasp = JS_XDRFindClassById(xdr, classId);
if (!clasp) {
char numBuf[12];
JS_snprintf(numBuf, sizeof numBuf, "%ld", (long)classId);
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_CANT_FIND_CLASS, numBuf);
ok = JS_FALSE;
goto out;
}
}
}
if (!clasp->xdrObject) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_CANT_XDR_CLASS, clasp->name);
ok = JS_FALSE;
} else {
ok = clasp->xdrObject(xdr, objp);
}
out:
if (xdr->mode != JSXDR_ENCODE && className)
JS_free(cx, (void *)className);
return ok;
}
#endif /* JS_HAS_XDR */
#ifdef DEBUG_brendan
#include <stdio.h>
#include <math.h>
uint32 js_entry_count_max;
uint32 js_entry_count_sum;
double js_entry_count_sqsum;
uint32 js_entry_count_hist[11];
static void
MeterEntryCount(uintN count)
{
if (count) {
js_entry_count_sum += count;
js_entry_count_sqsum += (double)count * count;
if (count > js_entry_count_max)
js_entry_count_max = count;
}
js_entry_count_hist[JS_MIN(count, 10)]++;
}
void
js_DumpScopeMeters(JSRuntime *rt)
{
static FILE *logfp;
if (!logfp)
logfp = fopen("/tmp/scope.stats", "a");
{
double mean = 0., var = 0., sigma = 0.;
double nscopes = rt->liveScopes;
double nentrys = js_entry_count_sum;
if (nscopes > 0 && nentrys >= 0) {
mean = nentrys / nscopes;
var = nscopes * js_entry_count_sqsum - nentrys * nentrys;
if (var < 0.0 || nscopes <= 1)
var = 0.0;
else
var /= nscopes * (nscopes - 1);
/* Windows says sqrt(0.0) is "-1.#J" (?!) so we must test. */
sigma = (var != 0.) ? sqrt(var) : 0.;
}
fprintf(logfp,
"scopes %g entries %g mean %g sigma %g max %u",
nscopes, nentrys, mean, sigma, js_entry_count_max);
}
fprintf(logfp, " histogram %u %u %u %u %u %u %u %u %u %u %u\n",
js_entry_count_hist[0], js_entry_count_hist[1],
js_entry_count_hist[2], js_entry_count_hist[3],
js_entry_count_hist[4], js_entry_count_hist[5],
js_entry_count_hist[6], js_entry_count_hist[7],
js_entry_count_hist[8], js_entry_count_hist[9],
js_entry_count_hist[10]);
js_entry_count_sum = js_entry_count_max = 0;
js_entry_count_sqsum = 0;
memset(js_entry_count_hist, 0, sizeof js_entry_count_hist);
fflush(logfp);
}
#endif /* DEBUG_brendan */
uint32
js_Mark(JSContext *cx, JSObject *obj, void *arg)
{
JSScope *scope;
JSScopeProperty *sprop;
JSClass *clasp;
JS_ASSERT(OBJ_IS_NATIVE(obj));
scope = OBJ_SCOPE(obj);
#ifdef DEBUG_brendan
if (scope->object == obj)
MeterEntryCount(scope->entryCount);
#endif
JS_ASSERT(!SCOPE_LAST_PROP(scope) ||
SCOPE_HAS_PROPERTY(scope, SCOPE_LAST_PROP(scope)));
for (sprop = SCOPE_LAST_PROP(scope); sprop; sprop = sprop->parent) {
if (SCOPE_HAD_MIDDLE_DELETE(scope) && !SCOPE_HAS_PROPERTY(scope, sprop))
continue;
MARK_SCOPE_PROPERTY(sprop);
if (!JSVAL_IS_INT(sprop->id))
GC_MARK_ATOM(cx, (JSAtom *)sprop->id, arg);
#if JS_HAS_GETTER_SETTER
if (sprop->attrs & (JSPROP_GETTER | JSPROP_SETTER)) {
#ifdef GC_MARK_DEBUG
char buf[64];
JSAtom *atom = (JSAtom *)sprop->id;
const char *id = (atom && ATOM_IS_STRING(atom))
? JS_GetStringBytes(ATOM_TO_STRING(atom))
: "unknown";
#endif
if (sprop->attrs & JSPROP_GETTER) {
#ifdef GC_MARK_DEBUG
JS_snprintf(buf, sizeof buf, "%s %s",
id, js_getter_str);
#endif
GC_MARK(cx,
JSVAL_TO_GCTHING((jsval) sprop->getter),
buf,
arg);
}
if (sprop->attrs & JSPROP_SETTER) {
#ifdef GC_MARK_DEBUG
JS_snprintf(buf, sizeof buf, "%s %s",
id, js_setter_str);
#endif
GC_MARK(cx,
JSVAL_TO_GCTHING((jsval) sprop->setter),
buf,
arg);
}
}
#endif /* JS_HAS_GETTER_SETTER */
}
/* No one runs while the GC is running, so we can use LOCKED_... here. */
clasp = LOCKED_OBJ_GET_CLASS(obj);
if (clasp->mark)
(void) clasp->mark(cx, obj, arg);
if (scope->object != obj) {
/*
* An unmutated object that shares a prototype's scope. We can't tell
* how many slots are allocated and in use at obj->slots by looking at
* scope, so we get obj->slots' length from its -1'st element.
*/
return (uint32) obj->slots[-1];
}
return JS_MIN(obj->map->freeslot, obj->map->nslots);
}
void
js_Clear(JSContext *cx, JSObject *obj)
{
JSScope *scope;
JSRuntime *rt;
JSScopeProperty *sprop;
uint32 i, n;
/*
* Clear our scope and the property cache of all obj's properties only if
* obj owns the scope (i.e., not if obj is unmutated and therefore sharing
* its prototype's scope). NB: we do not clear any reserved slots lying
* below JSSLOT_FREE(clasp).
*/
JS_LOCK_OBJ(cx, obj);
scope = OBJ_SCOPE(obj);
if (scope->object == obj) {
/* Clear the property cache before we clear the scope. */
rt = cx->runtime;
for (sprop = SCOPE_LAST_PROP(scope); sprop; sprop = sprop->parent) {
if (!SCOPE_HAD_MIDDLE_DELETE(scope) ||
SCOPE_HAS_PROPERTY(scope, sprop)) {
PROPERTY_CACHE_FILL(&rt->propertyCache, obj, sprop->id, NULL);
}
}
/* Now that we're done using scope->lastProp/table, clear scope. */
js_ClearScope(cx, scope);
/* Clear slot values and reset freeslot so we're consistent. */
i = scope->map.nslots;
n = JSSLOT_FREE(LOCKED_OBJ_GET_CLASS(obj));
while (--i >= n)
obj->slots[i] = JSVAL_VOID;
scope->map.freeslot = n;
}
JS_UNLOCK_OBJ(cx, obj);
}
jsval
js_GetRequiredSlot(JSContext *cx, JSObject *obj, uint32 slot)
{
jsval v;
JS_LOCK_OBJ(cx, obj);
v = (slot < (uint32) obj->slots[-1]) ? obj->slots[slot] : JSVAL_VOID;
JS_UNLOCK_OBJ(cx, obj);
return v;
}
void
js_SetRequiredSlot(JSContext *cx, JSObject *obj, uint32 slot, jsval v)
{
uint32 nslots, rlimit, i;
JSClass *clasp;
jsval *newslots;
JS_LOCK_OBJ(cx, obj);
nslots = (uint32) obj->slots[-1];
if (slot >= nslots) {
clasp = LOCKED_OBJ_GET_CLASS(obj);
rlimit = JSSLOT_START(clasp) + JSCLASS_RESERVED_SLOTS(clasp);
JS_ASSERT(slot < rlimit);
if (rlimit > nslots)
nslots = rlimit;
newslots = (jsval *)
JS_realloc(cx, obj->slots - 1, (nslots + 1) * sizeof(jsval));
if (!newslots) {
JS_UNLOCK_OBJ(cx, obj);
return;
}
for (i = 1 + newslots[0]; i <= rlimit; i++)
newslots[i] = JSVAL_VOID;
newslots[0] = nslots;
if (OBJ_SCOPE(obj)->object == obj)
obj->map->nslots = nslots;
obj->slots = newslots + 1;
}
obj->slots[slot] = v;
JS_UNLOCK_OBJ(cx, obj);
}
#ifdef DEBUG
/* Routines to print out values during debugging. */
void printChar(jschar *cp) {
fprintf(stderr, "jschar* (0x%p) \"", (void *)cp);
while (*cp)
fputc(*cp++, stderr);
fputc('"', stderr);
fputc('\n', stderr);
}
void printString(JSString *str) {
size_t i, n;
jschar *s;
fprintf(stderr, "string (0x%p) \"", (void *)str);
s = JSSTRING_CHARS(str);
for (i=0, n=JSSTRING_LENGTH(str); i < n; i++)
fputc(s[i], stderr);
fputc('"', stderr);
fputc('\n', stderr);
}
void printVal(JSContext *cx, jsval val);
void printObj(JSContext *cx, JSObject *jsobj) {
jsuint i;
jsval val;
JSClass *clasp;
fprintf(stderr, "object 0x%p\n", (void *)jsobj);
clasp = OBJ_GET_CLASS(cx, jsobj);
fprintf(stderr, "class 0x%p %s\n", (void *)clasp, clasp->name);
for (i=0; i < jsobj->map->nslots; i++) {
fprintf(stderr, "slot %3d ", i);
val = jsobj->slots[i];
if (JSVAL_IS_OBJECT(val))
fprintf(stderr, "object 0x%p\n", (void *)JSVAL_TO_OBJECT(val));
else
printVal(cx, val);
}
}
void printVal(JSContext *cx, jsval val) {
fprintf(stderr, "val %d (0x%p) = ", (int)val, (void *)val);
if (JSVAL_IS_NULL(val)) {
fprintf(stderr, "null\n");
} else if (JSVAL_IS_VOID(val)) {
fprintf(stderr, "undefined\n");
} else if (JSVAL_IS_OBJECT(val)) {
printObj(cx, JSVAL_TO_OBJECT(val));
} else if (JSVAL_IS_INT(val)) {
fprintf(stderr, "(int) %d\n", JSVAL_TO_INT(val));
} else if (JSVAL_IS_STRING(val)) {
printString(JSVAL_TO_STRING(val));
} else if (JSVAL_IS_DOUBLE(val)) {
fprintf(stderr, "(double) %g\n", *JSVAL_TO_DOUBLE(val));
} else {
JS_ASSERT(JSVAL_IS_BOOLEAN(val));
fprintf(stderr, "(boolean) %s\n",
JSVAL_TO_BOOLEAN(val) ? "true" : "false");
}
fflush(stderr);
}
void printId(JSContext *cx, jsid id) {
fprintf(stderr, "id %d (0x%p) is ", (int)id, (void *)id);
printVal(cx, ID_TO_VALUE(id));
}
void printAtom(JSAtom *atom) {
printString(ATOM_TO_STRING(atom));
}
#endif
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